Packing laminate

FIELD: process engineering.

SUBSTANCE: invention relates to packing laminate, its fabrication and application, to package for foodstuffs or drinks. Retortable packing laminate comprises main layer of sized paper or cardboard, barrier layer for liquid and barrier layer for gas. Note here that said paper or cardboard comprises expanded or nonexpanded expanding thermoplastic microspheres.

EFFECT: higher resistance against water and gas penetration.

17 cl, 10 tbl, 8 ex

 

The present invention relates to a packaging laminate, its manufacture and use, as well as packaging for food and its production.

The packaging laminate containing at least one layer of paper or cardboard, is widely used for packaging containers for food products. Examples of such a laminate is described, for example, in WO 02/090206, WO 97/02140, WO 97/02181 and WO 98/18680.

Finished packaging containers can be manufactured from a packaging laminate with the help of modern machines for packaging and filling out that form, fill and seal packaging. In combination with the formation and filling of the packaging the packaging laminate can be treated with a disinfectant, such as aqueous hydrogen peroxide solution. When the food product is packaged for long-term storage in Packed form, packaging in General, can be autoclaved under the high temperature and pressure in excess of atmospheric, for example, by using hot steam, and then rapidly cooled by direct contact with water. In any of these cases, the liquid or moisture can penetrate into the layer of paper or cardboard on the exposed edges. Describes the various attempts to solve this problem.

In the previously mentioned WO 02/090206 describes that the paper or cardboard can be made hydrophobic pore the STV sizing in the mass with water dispersion alkylating dimer.

In WO 03/021040 describes the cardboard for packaging, consisting of one or more layers, with a top layer of bleached Kraft pulp having a degree of gloss 15-50%, the minimum range of gloss, density in the range from 700 to 850 kg/m3and which is hydrophobic due to the processing of a sizing agent for each layer.

In WO 2005/003460 describes the packaging, designed for thermal processing, containing packaging material on the basis of the fibers treated with a hydrophobic sizing agent containing one or more layers with low permeability to water on the outside and/or inside of the substrate of the fibers. A substrate of fibers is treated with a combination of a sizing agent for imparting water resistance hydrophobic sizing agent and aluminum compounds and/or calcium.

In WO 03/106155 describes a method of forming a container from a packaging laminate to protect the edges against moisture.

In WO 2004/056666 describes a cycle of heating packs to minimize the penetration of moisture at the edges.

Posted Japanese patent application JP 2002-254532 describes containers of insulating paper containing thermoplastic microspheres. Describes the properties associated with the impregnation of edges is improved by preventing expansion of the microspheres on the edges of the papers is.

Other disclosures relating to the use of thermoplastic microspheres in the paper for various applications include US patents 3556934, 4133688, 5125996 and 6379497, the Japan patent JP 2689787 lined Japanese patent application JP 2003-105693, WO 01/54988, WO 2004/099499, WO2004/101888, WO 2004/113613 and WO 2006/068573, the publication of the patent application US 2001/0038893 and O. Soderberg, "World Pulp & Paper Technology 1995/96, The International Review for Pulp & Paper Industry" p. 143-145.

Various sizing compositions are described, for example, in US patents 4654386, 5969011, 6093217, 6165259, 6306255, 6444024, 6485555,6692560,6818100 and 6846384.

The aim of the present invention is to provide a food package made from the packaging laminate with high resistance against penetration of liquids or moisture at the edges of the laminate.

An additional objective of the present invention is to provide a packaging laminate, containing paper or paperboard, with properties suitable for this package.

Discovered that these objectives can be achieved through the inclusion of extended or expanding unexpanded thermoplastic microspheres in the paper or at least on the edges of the paper.

Thus, one aspect of the present invention relates to a packaging laminate containing at least one base layer of paper or cardboard, at least one barrier layer for liquid and at least one defence the RNA layer for gas, while this paper or cardboard, preferably, contains at least at their edges extended or expanding unexpanded thermoplastic microspheres.

Another aspect of the present invention relates to a method of manufacturing a packaging laminate comprising a stage of applying at least one barrier layer for liquid and at least one gas barrier layer on a sheet or leaf of paper or paperboard, containing, preferably, at least at their edges, extended or expanding unexpanded thermoplastic microspheres.

Another aspect of the present invention relates to the use of the packaging laminate, as defined above, for the manufacture of sealed packages for food or drinks.

An additional aspect of the present invention relates to a method for manufacturing sealed packages, comprising a stage of formation of the container from a packaging laminate, fill the container with the food product or beverage and sealing the container, with the specified packaging laminate comprises at least one base layer of paper or paperboard and at least one barrier layer for liquid and, preferably, at least one barrier layer for gas, and the specified paper or cardboard contains p is edocfile, at least at their edges extended or expanding unexpanded thermoplastic microspheres.

Another additional aspect of the present invention relates to a sealed package for food products or beverages, are manufactured from the packaging laminate containing at least one base layer of paper or paperboard and at least one barrier layer for liquid and, preferably, at least one barrier layer for gas, and the specified paper or cardboard contains, preferably, at least at their edges extended or expanding unexpanded thermoplastic microspheres.

In one embodiment, the implementation of the packaging is suitable for packaging food or beverages should not be subjected to heat treatment after the package is filled and sealed. Typically, such packaging is used for beverages such as milk, juice and other soft drinks, and packaging laminate used for this, will here be referred to as a packaging laminate of the liquid or cardboard for packaging liquids. The desired properties of the packaging laminate for liquid include the ability to resist liquid contents of the package, as well as liquid disinfectants, such aqueous solutions of peroxide of odor is Yes.

In another embodiment, the package is suitable for foods or drinks, where the filled and sealed package is subjected to heat treatment to increase the retention time of the content. Such packages can be used for all kinds of foods, especially those that are traditionally Packed in cans, and will be referred to here as sterilisable packaging and material for them as sterilisable packaging laminate or sterilized cardboard. The desirable properties of sterilized packaging laminate include the ability to withstand treatment with saturated steam at high temperature and pressure, for example, from about 110 to about 150°C, for a time from about 30 minutes to about 3 hours.

The packaging laminate according to the present invention contains one or more core layers of paper or cardboard, usually containing pulp fibers. Preferably, the core layer of paper or cardboard has a weight from about 30 to about 2250 g/m2or from about 50 to about 1500 g/m3most preferably, from about 65 to about 500 g/m2or from about 100 to about 300 g/m2. The density is preferably equal to from about 100 to about 1200 kg/m3most preferably, from about 150 to about 1000 kg/m 3or from about 200 to about 900 kg/m3.

Paper or cardboard can be manufactured from various types of pulp such as bleached or unbleached cellulose-based natural and/or recycled fibers. The pulp may be based on cellulose fibers, such as Kraft pulp, sulfite pulp and organosolvent cellulose, wood pulp, such as thermomechanical pulp (TMP), chemo-thermomechanical pulp (CTMP), refiner wood pulp and wood pulp of crushed wood, from both hardwood and softwood, and can be based on recycled fibres, optionally, from refined pulp (DIP) and their mixtures. Paper or cardboard may contain one or more layers of same or different types of pulp. Examples of multilayer combinations include the top of bleached pulp/the middle of the DIP, CTMP or wood pulp/back side of bleached pulp; the top of bleached pulp/the middle of the DIP, CTMP or wood pulp/back side of the wood pulp; the top of bleached pulp/the middle of the DIP, CTMP or wood pulp/ back side of the unbleached pulp; and the top of bleached pulp/back side of the unbleached pulp, the upper side is not necessarily sabalcore, back and sides supplied with optional coating. The upper side refers to the side intended to be placed on the outside of the finished package. In multilayer paper or cardboard at least one layer contains a thermoplastic microspheres. In paper or cardboard with three or more layers, preferably, at least one middle layer contains a thermoplastic microspheres.

In a single layer of paper or cardboard weight, preferably ranges from about 50 to about 1500 g/m2most preferably, from about 100 to about 700 g/m2or from about 150 to about 500 g/m2. The density is preferably equal to from about 100 to about 1200 kg/m3most preferably, from about 150 to about 1000 kg/m3or from about 200 to about 800 kg/m3.

A double layer of paper or cardboard weight on one layer, preferably, is from about 25 to about 750 g/m2most preferably, from about 50 to about 400 g/m2or from about 100 to about 300 g/m2. The total weight, preferably ranges from about 50 to about 1500 g/m2most preferably, from about 100 to about 800, or from about 200 to about 600 g/m2. The total density preferably ranges from about 300 to note the RNO 1200 kg/m 3most preferably, from about 400 to about 1000 kg/m3or from about 450 to about 900 kg/m3.

In paper or cardboard of three or more layers to the outer layers preferably have a weight from about 10 to about 750 g/m2most preferably, from about 20 to about 400 g/m2or from about 30 to about 200 g/m2. The density of the outer layers preferably ranges from about 300 to about 1200 kg/m3most preferably, from about 400 to about 1000 kg/m3or from about 450 to about 900 kg/m3. Central or nenarocny layer or layers preferably have a weight from about 10 to about 750 g/m2most preferably, from about 25 to about 400 g/m2or from about 50 to about 200 g/m2. The density of the Central or neuroimage layer or layers preferably ranges from about 10 to about 800 kg/m3most preferably, from about 50 to about 700 kg/m3or from about 100 to about 600 kg/m3. The total weight, preferably ranges from about 30 to about 2250 g/m2most preferably, from about 65 to about 800 g/m2or from about 110 to about 600 g/m2. The total density is preferably from about 100 to about 1000 kg/m3, Naib is more preferably from about 200 to about 900 kg/m3or from about 400 to about 800 kg/m3.

An implementation option sterilisable packaging laminate includes a base layer of two-ply paper or paperboard, made from bleached and unbleached, respectively, Kraft pulp from coniferous wood. However, there may be used other combinations of single or multi - layer paper or cardboard with different compositions.

Variant implementation of the packaging laminate for liquid contains the core layer of the three-ply paper or paperboard, in which, preferably, at least the middle layer contains a thermoplastic microspheres. Examples of combinations of layers include those described above.

Paper or cardboard, preferably, glue, most preferably, glue in the mass of hydrophobic sizing agent. In multilayer paper or cardboard, which means that glue at least one layer. Such a layer can contain or not contain a thermoplastic microspheres. Preferred sizing agents include sizing agents that interact chemically with cellulose, such as ketonovye dimers or multimer, such alkyl - or alkenylamine the dimers (AKD), succinate anhydrides, such alkyl - or alkenylamine the anhydrides (ASA, and mixtures thereof. Other useable sizing agents include sizing agents that do not interact chemically with cellulose, such as rosin, starch and other polymeric sizing agents such as copolymers of styrene with vinyl monomers such as maleic anhydride, acrylic acid and their complex alkalemia esters, acrylamide and the like. The same or different sizing agents can be used for different layers, such as paper or cardboard. For example, you can use AKD or ASA in one or more layers and rosin in one or more other layers. The number of sizing agent preferably ranges from about 0.1 to about 10 kg/ton of paper, more preferably, from about 0.3 to about 5 kg/ton of paper and, most preferably, from about 0.5 to about 4.5 kg/tonne of paper or from about 2 to about 4 kg/tonne of paper.

Preferred ketonovye dimers have the General formula (I)

where R1and R2are the same or different saturated or unsaturated hydrocarbon group such as alkyl, alkenyl, cycloalkyl, aryl or aralkyl. The hydrocarbon group may have a branched or straight chain and preferably have from 6 to 36 carbon atoms, most preferably from 12 to 20 carbon atoms. Examples of hydrocarbon groups include having a branched chain and having a straight chain octillo, decile, dodecyloxy, tetradecanol, hexadecanol, octadecanol, akosile, docosanol, tetracosyl, phenyl, benzyl, beta-naftalina, tsiklogeksilnogo and hexadecyl group. Suitable for use ketonovye dimers include those that are derived from organic acids, such as montanosa acid, naphthenic acid, 9,10-dellanave acid, 9,10-dolezelova acid, palmitoleic acid, oleic acid, ricinoleic acid, linoleic acid, stearic acid, ezoterikova acid, aleocharinae acid, naturally occurring mixtures of fatty acids found in coconut oil, babassu oil, palm stone fruit oil, palm oil, olive oil, peanut oil, rape oil, beef fat, lard, whale blubber and mixtures of any of the above-mentioned fatty acids with each other. Depending on the hydrocarbon groups ketonovye dimers can be solid or liquid at room temperature (25°C).

In most cases, a sizing agent is included in a product containing a natural polymer such as starch or a synthetic polymer. Appropriate sizing is repeat, preferably, is in water dispersion with a preferred content of the dry product from about 5 to about 40 wt.%, most preferably, from about 15 to about 30 wt.%. Preferably, from about 50 to about 99 wt.%, most preferably, from about 75 to about 95% wt. the content of dry products of the drug consists of a sizing agent, as described above.

Found that surprisingly good results are achieved if the sizing agent, in particular ketonovy dimer or multimer, alkylamino anhydride, rosin or a mixture thereof are included in the sizing formulation containing the polymer based on acrylamide, in particular, charged, and most preferably, the polymer-based cationic acrylamide. However, it can also be used based polymers, anionic, amphoteric and non-ionic acrylamide. The number of polymer based on acrylamide, preferably, is from about 1 to about 50 wt.%, most preferably, from about 5 to about 30 wt.%. or from about 10 to about 20% wt. in relation to the content of dry product sizing agent.

Sizing the preparation can also contain other commonly used additives, such as compounds which act as dispersants, emulsification or stabilizers, examples of which VK is ucaut in itself organic compounds, like naphthalenesulfonate, lignosulfonate, Quaternary ammonium compounds and salts thereof, cellulose and derivatives thereof, and inorganic compounds such as compounds of polyamine, such as polyaluminium chloride, polyaluminium sulfate or polyaluminum silicate sulfate. Other additives include various types of biocides and protivovspenivayushchie agents. Suitable for use additives in sizing preparations are described, for example, in patents US 6165259, 5969011, 6306255 and 6846384. The number of organic compounds acting as dispersants, emulsification or stabilizers, can be, for example, from about 0.1 to about 10% wt. from the content of dry products. The number of connections of polyamine may, for example, be from about 0.1 to about 10% wt. from the content of dry products. The amount of biocide may be, for example, from about 0.01 to about 2 wt.%. from the content of dry matter.

Preferred polymers based on acrylamide have an average molecular weight equal to at least about 10,000, or at least about 50000. In most cases, the molecular weight is preferably at least about 100,000, or at least about 500000. In most cases, it is preferable that the molecular weight was applied, the but not more than 50 million, or approximately no more than 20 million, or no more than about 5 million.

Suitable for use polymers based on acrylamide can be obtained through the polymerization of acrylamide or based monomers acrylamide, preferably, in combination with one or more ethylene-unsaturated cationic, potentially cationic, anionic or potentially anionic monomers. The term "potentially cationic monomer", as used here, refers to a monomer bearing potentially an ionisable group, which becomes cationic when included in the polymer when it is entered into the pulp suspension. The term "potentially anionic monomer", as used here, refers to a monomer bearing potentially an ionisable group that becomes an anionic, when included in the polymer when it is entered into the pulp suspension.

Examples of monomers of acrylamide and monomers on the basis of acrylamide include methacrylamide, N-alkyl (meth)acrylamide, such as N-methyl (meth)acrylamide, N-ethyl (meth)acrylamide, N-n-propyl (meth)acrylamide, N-isopropyl (meth)acrylamide, N-n-butyl (meth)acrylamide, N-tert-butyl (meth)acrylamide and N-isobutyl (meth)acrylamide; N-alkoxyalkyl (meth)acrylamide, such as N-n-butoxymethyl (meth)acrylamide and N-isobutoxide (meth)acrylamide; N,N-dialkyl (meth)acrylamide, such as N,N-dimethyl (meth)acrylamide; and dialkylamino-alkyl(methacrylamide.

Suitable for use ethylene-unsaturated cationic or potentially cationic monomers, preferred are water-soluble. Examples of such monomers include halides of diallyldimethylammonium, such as diallyldimethylammonium chloride, and cationic monomers represented by the General structural formula (II):

where R1represents H or CH3; R2and R3represent, independently of one another, H or, preferably, a hydrocarbon group, respectively, alkyl having from 1 to 3 carbon atoms, preferably 1-2 carbon atoms; A represents O or NH; B is an alkyl or alkilinity group having from 2 to 8 carbon atoms, respectively, from 2 to 4 carbon atoms, or hydroxypropranolol group; R4represents H or, preferably, a hydrocarbon group, respectively, alkyl having 1-4 carbon atoms, preferably 1-2 carbon atoms, or Deputy containing aromatic group, respectively, phenyl or substituted phenyl group, which may be joined to the nitrogen by alkalinous groups typically have from 1 to 3 carbon atoms, respectively, 1-2 carbon atoms, optional, R4includes a benzyl group (-CH2-C6H5); and X-predstavljaet an anionic counterion, typically a halide like chloride.

Examples of usable monomers represented by the General structural formula (II)include Quaternary monomers, which can be obtained by processing dialkylaminoalkyl (meth)acrylates, such as dimethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate and dimethylamino-hydroxypropyl (meth)acrylate, or dialkylaminoalkyl (meth)acrylamides, such as dimethylaminoethyl (meth)acrylamide, diethylaminoethyl (meth)acrylamide, dimethylaminopropyl (meth)-acrylamide and diethylaminopropyl (meth)acrylamide, methyl chloride or benzylchloride. Preferred cationic monomers of the General formula (II) include Quaternary methylchloride salt dimethylaminoethylacrylate, Quaternary methylchloride salt dimethylaminoethylmethacrylate, Quaternary benzylchloride salt dimethylaminoethylacrylate and Quaternary benzylchloride salt dimethylaminoethylmethacrylate.

Examples of usable polymerized anionic or potentially anionic monomers include ethylene-unsaturated carboxylic acids and their salts, such as (meth)acrylic acid and its salts; ethylene-unsaturated sulfonic acids and their salts, such as 2-acrylamide-2-methylpropanesulfonate, sulfoethyl(meth)acrylate, vinylsulfonic acid and its salts, tirolalpin and parameningeal(hydroxy styrene) and their salts. Can use any salts such as salts of sodium or other alkali metals.

Amphoteric polymers based on acrylamide can be obtained by polymerization of a mixture containing one or more monomers based on acrylamide, one or more ethylene-unsaturated anionic or potentially anionic monomers and one or more water-soluble ethylene-unsaturated cationic or potentially cationic monomers. Examples of usable anionic or potentially anionic monomers include those discussed above.

Monomeric mixture to obtain a polymer based on acrylamide may also contain one or more polyfunctional agents for cross-linking in addition to the above ethylene-unsaturated monomers. The presence of polyfunctional agent for cross-linking in the monomer mixture improves the ability of the polymer to the dispersion in water. Multifunctional agents for the cross-linkage can be nonionic, cationic, anionic or amphoteric. Examples of usable polyfunctional agents for cross-linking include compounds having at least two ethylene-unsaturated communication, for example N,N-methylene-bis(meth)acrylamide, polyethylene glycol di(meth)acrylate, N-vinyl (meth)acrylics is d, the divinylbenzene salt of triethylamine and N-methylallyl(meth)acrylamide; compounds having an ethylene unsaturated bond and a reactive group, such as glycidyl (meth)acrylate, acrolein and methylol(meth)acrylamide; and compounds having at least two reactive groups, such as dialdehyde such as glyoxal, diepoxy connection and epichlorohydrin. Suitable for use dispersible in water, the polymers can be obtained using at least 4 molar ppm polyfunctional agent for cross-linking with respect to the monomers present in the Monomeric mixture, or in relation to the Monomeric units present in the polymer, preferably from about 4 to about 6000 molar ppm, most preferably from 20 to 4000. Examples suitable for use dispersible in water polymers include polymers based on acrylamide, as described in patent US 5167766.

The relationship between acrylamide or based monomers of acrylamide and charged or potentially charged monomers is selected to obtain a polymer based on acrylamide with a corresponding charge density. For cationic polymer based on acrylamide charge density preferably ranges from about 0.1 to about 11 mEq/g or from about 0.5 to about 10 m is HF/g, most preferably, from about 0.6 to about 8 mEq/g or from about 1 to about 5 mEq/g, In some cases, the charge density of the cationic polymer based on acrylamide, preferably, is from about 3 to about 8 mEq/g For anionic polymer based on acrylamide charge density preferably ranges from about 0.5 to about 10 mEq/g, most preferably from about 2 to about 8 mEq/g

Paper or cardboard may further comprise a moisture resistant agent, which is added to the mass before dehydration. Suitable for use moisture-proof agents include resin polyaminophenyl, polyamideimides, polyamideimides, urea/formaldehyde, urea/melamine/formaldehyde, phenol/formaldehyde condensate polyacrylamide/glyoxal, polyvinylene, polyurethane, MDI, and mixtures thereof, among which polyamideimides (PAAE) is particularly preferred. The amount of moisture proof agent, preferably, is from about 0.1 to about 10 kg/ton of papers, most preferably, from about 0.5 to about 5 kg/ton of paper.

It is particularly preferable that at least one agent, a sizing agent, preferably metanovogo dimer, and moisture-proof agent, before occhialino, polyamideimides, was added to the mass upon receipt paper or cardboard.

Paper or cardboard may also contain other additives normally used in the preparation of paper and added to the mass before dehydration. Such additives may include one or more fillers, such as mineral fillers such as kaolin, porcelain clay, titanium dioxide, gypsum, talc, chalk, ground marble or precipitinogen calcium carbonate. Other commonly used additives may include retaining additives, aluminum compounds, dyes, agents for increasing the optical brightness and the like. Examples of aluminum compounds include alum, aluminates and connection of polyamine, such as chlorides and sulfates of polyalanine. Examples of retaining additives include cationic polymers, anionic inorganic materials in combination with organic polymers, such as polymers based on acrylamide, for example bentonite in combination with cationic organic polymers or colloidal solution on the basis of silicon oxide in combination with a cationic organic polymers or cationic and anionic organic polymers.

Examples of cationic organic polymers suitable for use in retaining additives include, for example, is that described in WO 2006/068576 and WO 2006/123989. In one embodiment, the implementation of the cationic organic polymer contains one or more aromatic groups are the same or different types. The aromatic group may be present in the main polymer chain (the main chain) or in the group-the Deputy that is attached to the main polymer chain. The relevant examples of aromatic groups include aryl, kalkilya and alkaline groups such as phenyl, fenelonov, naftalina, killenemy, benzyl and phenylethylene group; nitrogen-containing aromatic (aryl) groups, such as pyridinium and hinolinova, as well as derivatives of these groups, such as benzyl. Examples of cationic charged groups that may be present in the cationic polymer and the monomers used to obtain the cationic polymer include Quaternary ammonium group, tertiary amino group and an acid additive salt.

The packaging laminate comprises at least one, preferably at least two barrier layers for liquid on each side of the core layer (s) of paper or cardboard. Barrier layer for liquid can be obtained from any material that shows a minor permeability to water or the lack of it. Usable materials include polymers of polyethylene, under the service of the high-density polyethylene or linear low density polyethylene, polypropylene, PVC (polyvinyl chloride), polyesters such as polyethylene terephthalate, and their physical or mechanical mixture. Can also be used copolymers, such as copolymers of ethylene and propylene. The barrier layer (layers) for the liquid can be applied by any known ways, such as different ways of laminating or something like that.

The packaging laminate may further comprise a barrier layer for gas, preferably, between the base layer and impermeable to the liquid layer, intended to be placed inside the packaging. You can use any material that shows a minor permeability for molecular oxygen or her absence. Examples of materials include metal foil, similar to aluminum foil, a coating of silicon dioxide, for example, applied in the form of a composition for coating containing colloidal silica, and optionally various additives, as described in WO 2006/065196, or obtained by plasma deposition. Other possible materials include polymers, like polyvinyl alcohol or copolymers of ethylene and vinyl alcohol. Barrier layer for gas can be applied by any known ways, such as different ways of laminating or something like that.

Typically, these are part of the performance communications layers to create barriers for liquid and gas, respectively, but in one embodiment, the barrier layer for liquid and a barrier layer for gas are provided using a single layer of material having barrier properties for both liquid and gas.

Thermoplastic microspheres in paper or cardboard, preferably, expanded and added to the mass during retrieval of paper or cardboard, or as pre-expanded microspheres, or as unexpanded thermally expanding microspheres, which, preferably, are expanded by heating during the process of obtaining paper or cardboard, for example, during the stage of drying when heat is applied, or on a separate stage of the method, for example, a cylindrical heater or laminator. Microspheres can be extended, when the paper or cardboard are still wet or when the paper or cardboard are completely or almost completely dried up. The microspheres preferably added in the form of their aqueous suspensions which can optionally contain other additives desired for introduction into the mass. The amount of injected thermoplastic microspheres, preferably, is from about 1 to about 100 kg/t of paper, most preferably, from about 1 to about 50 kg/t of paper or from about 4 to about 40 kg/t of paper.

Thermally expanding thermoplastic the microspheres, as mentioned here, it is preferable to contain a shell of a thermoplastic polymer that encapsulates the propellant. The propellant preferably is a liquid having a boiling point of not higher than the softening temperature of the shell of thermoplastic polymer. During heating of the propellant increases the internal pressure at the same time, when the shell softens, resulting in a significant expansion of the microspheres. Expanding or pre-expanded thermoplastic microspheres are commercially available under the trade name Expancel® (Akzo Nobel) and are available in market in various forms, for example, as a dry granular particles, such as aqueous suspension or as a partially dewatered wet sediment. They are also well described in the literature, for example, in US patents 3615972, 3945956, 4287308, 5536756, 6235800, 6235394 and 6509384, in the publication of the patent application US 2005/0079352, in EP 486080 and EP 1288272, WO 2004/072160, WO 2007/091960 and WO 2007/091961 and posted in Japanese patent applications JP 1987-286534, 2005-213379 and 2005-272633.

Sheath of thermoplastic polymer thermoplastic microspheres, preferably, is made of a Homo - or copolymer obtained by polymerization of the ethylene-unsaturated monomers. These monomers may, for example, be a monomer containing a nitrile, such as Acrylonitrile, Methacrylonitrile, α is oracelvarel, α-ethoxyacrylate, fumaronitrile or crotonate; complex acrylic esters such as methyl acrylate or acrylate; complex methacrylic esters such as methyl methacrylate, isobornylacrylat or methacrylate; vinylchloride, such as vinyl chloride; compound vinyl esters such as vinyl acetate, simple vinyl esters, such as alkylvinyl esters, such simple methylvinylketone ether or ethylvanillin ether, and other vinyl monomers, such as vinylpyridine; vinylidenechloride, such as vinylidenechloride; styrene, such as styrene, halogenated styrene or α-methylsterol; or diene, such as butadiene, isoprene and chloroprene. You can also use any mixtures of the above monomers.

Propellant thermoplastic microspheres may contain hydrocarbons, such as propane, butane, isobutane, n-pentane, isopentane, neopentane, hexane, isohexane, neohexane, heptane, isoheptane, octane or isooctane, or mixtures thereof. In addition they can also be used in other types of hydrocarbons such as petroleum ether, or chlorinated or fluorinated hydrocarbons such as methyl chloride, methylene chloride, dichloroethane, dichloroethylene, trichloroethane, trichloroethylene, Trichlorofluoromethane, perfluorinated hydrocarbons, and the like.

Expanding thermoplastic microspheres suitable for the present invention, preferably have a volume median diameter of from about 1 to about 500 microns, more preferably, from about 5 to about 100 microns, most preferably, from about 10 to about 50 microns. The temperature at which the expansion, referred to as Tstartpreferably, ranges from about 60 to about 150°C, most preferably from about 70 to about 100°C. the Temperature at which maximum expansion, referred to as Tmaxpreferably, ranges from about 90 to about 180°C, most preferably from about 115 to about 150°C.

Pre-expanded thermoplastic microspheres suitable for the present invention preferably have an average volume median diameter of from about 10 to about 120 microns, most preferably from about 20 to about 80 microns. The density is preferably from about 5 to about 150 g/DM3most preferably, from about 10 to about 100 g/DM3. Even if the pre-expanded thermoplastic microspheres are commercially available as such, it is also possible to obtain them by means of thermal expansion on the place of expanding unexpanded thermoplastic microspheres, for example, just before they are added to the mass, h is about easier if expanding microspheres have Tstartbelow about 100°C, so that steam may be used as the heating medium.

The present invention will be described hereinafter in connection with the following further Examples, which, however, should not be interpreted as limiting the scope of the claims of the present invention. Unless approved otherwise, all proportions and percentages are parts and percentages mass.

In the Examples were used, one or more of the following products:

ST 1: Biological-based polymer of cationic starch, modified 2,3-hydroxypropyltrimethylammonium, D.S. 0,042, the polymer having a cationic charge density of about 0.28 mEq/g

ST 2: Biological polymer-based cationic starch, modified 2,3-hydroxypropyltrimethylammonium, D.S. 0.02; the polymer having a cationic charge density of about 0.14 mEq/g

ST 3: Biological polymer-based cationic starch, modified 2,3-hydroxypropyltrimethylammonium, D.S. 0,035, the polymer having a cationic charge density of about 0.23 mEq/g

WS 1: Moisture proof agent PAAE (Eka WS XO)

WS 2: Moisture proof agent PAAE (Eka WS 320)

SA 1: Sizing the drug with AKD and 10% wt. in relation to AKD cationic polymer obtained by polymerization of 90 mole% acrylamide and 10 mole% quarter who offered methylchloride salt dimethylaminoethylacrylate, and having a weighted average molecular weight of about 1 million and a cationic charge density of about 1.2 mEq/g

SA 2: Sizing agent AKD, stable starch (Eka DR 28 HF).

SA 3: Sizing agent AKD, stable starch (Eka DR C223).

MS 1: Expanding microspheres Expancel™ (461WU20) with an average particle size of 6-9 microns.

MS 2: Pre-expanded microspheres Expancel™ (461WE20) with an average particle size of 20-30 microns.

MS 3: Expanding microspheres Expancel™ (820SL40) with an average particle size of 10 to 16 μm.

MS 4: Expanding microspheres Expancel™ (551DUX12), fraction with an average particle size of 4-6 microns.

PL 1: Polymer-based cationic acrylamide obtained by the polymerization of 90 mole% acrylamide and 10 mole% of Quaternary methylchloride salt dimethylaminoethylacrylate and having a weighted average molecular weight of about 6 million and a cationic charge of about 1.2 mEq/g

PL 2: Polymer-based cationic acrylamide obtained by the polymerization of 90 mole% acrylamide and 10 mole% of Quaternary benzylchloride salt dimethylaminoethylacrylate, and having a weighted average molecular weight of about 6 million and a cationic charge of about 1.2 mEq/g

NP 1: Anionic inorganic polymer condensation of silicic acid in the form of a Sol of colloidal silicon dioxide, modified aluminum, which is elicina S < 35 and containing particles based on silica with a specific surface area of about 700 m2/year

Example 1:The Central layer of the packaging carton for liquids with a weight of approximately 120 g/m2received in the apparatus for forming sheets Dynamic Sheet Former (Formette Dynamic, comes Fibertech AB, Sweden) from the mass based on 100% by weight, unbleached chemo-thermomechanical pulp (CTMP) with consistent mass 0.5% and pH neutral.

The paper sheets were formed in a Dynamic Sheet Former by leveling mass from the mixing basin via a supply nozzle in a rotating drum on a film of water on top of the grid, spinning mass with the formation of the sheet, pressing and drying the sheet.

Add to the mass was done in the following time (in seconds) before the upload:

90 sec, Cationic starch

75 seconds, water-Resistant agent PAAE

60 sec, a Sizing agent AKD

45 sec, Microspheres Expancel™

30 sec, Cationic polymer

15 sec, Anionic Sol oxide silicon

0 sec, Pumping

The cardboard sheets were pressed and dried in a cylindrical dryer at 140°C, causing heat treatment of the microspheres either in the wet or in a dry surrounding canvas paper and extending at least the unexpanded microspheres. Used two different methods of drying.

Wet heat treatment: preliminary drying, 2 min 105° (still wet) + final drying, 140°C.

Dry heat treatment: drying, 10 min 105°C (dry) + final drying, 140°C.

The samples were obtained by lamination of cardboard material and PVC and cutting pieces 75x25 mm

Penetration into the raw edge (REP) of the samples investigated in two ways:

1. REP, Water: Water 80°C, 3 case. REP, H2O2: Aqueous 35% solution of hydrogen peroxide, 70°C, 10 minutes

The results for the wet heat treatment shown in Table 1, while results for dry heat treatment shown in Table 2. Levels add calculated as dry weight relative to the dry weight of the system, except for particles of oxide silicon, to which additions are calculated as SiO2in relation to the system dry mass.

Table 1
(Wet heat treatment)
no testST1
(kg/t)
WS1
(kg/t)
SA1
(kg/t)
MS
(kg/t)/type
System
retention
PL1/NP1
REP, H2O2(kg/m2)
1 (EUR.)5-0,5 -0,3/0,315,22
2 (EUR.)5-4-0,3/0,32,08
35-0,54/1 MS0,3/0,3of 13.05
4510,54/1 MS0,3/0,39.10
55-44/1 MS0,3/0,31,35
65-440/MS 10,3/0,31.42
75-44/MS 20,3/0,3 1,16
85-440/MS 20,3/0,31,63

Table 2
(Dry heat treatment)
no testST1
(kg/t)
WS1
(kg/t)
SA1
(kg/t)
MS
(kg/t)/type
Retention system
PL1/NP1
REP, water
(kg/m2)
1 (EUR.)5-0,5-0,3/0,310,18
2 (EUR.)5-4-0,3/0,34,00
35-0,54/1 MS0,3/0,3to 9.93
4510,54/1 MS0,3/0,39,54
55-44/1 MS0,3/0,33,82
65-440 / MS 10,3/0,33,25
75-44/MS 20,3/0,33,32
85-440/MS 20,3/0,33,55

Example 2:The Central layer of the packaging carton for liquid received on XPM (experimental paper machine) using the same pulp as used in Example 1 at pH 8.0.

Add to the mass was done in the following order:

Cationic starch of 1.50%

Moisture is Toni agent PAAE

Microspheres Expancel™

Cationic starch 2, 50%

A sizing agent AKD

Cationic polymer

Anionic colloidal solution of silicon oxide

Paper grid was dried to a maximum at 100°C in XPM (maximum drying temperature 100°C). Microspheres were subjected to dry heat treatment at 140°C in a cylindrical dryer. The samples were obtained and examined as in Example 1 except that an aqueous solution of hydrogen peroxide was only 30%. The results are shown in Table 3 at the levels added, calculated as in Example 1.

Table 3
no testST 1
(kg/t)
SA1
(kg/t)
MS
(kg/t)/type
Retention system PL1/NP1REP, Water
(kg/m2)
REP, H2O2(kg/m2)
1 (EUR.)3+3--0,15/313,9921,31
2 (EUR.)3+30,5-0,15/3 13,0620,82
3
(EUR.)
3+31-0,15/36,2214,62
4
(EUR.)
3+34-0,15/34,087,01
53+30,54/1 MS0,15/311,9619,95
63+30,520/MS 10,15/311,4720,17
73+30,540/MS 10,15/311,7120,44
83+344/1 MS0,15/33,5493+3420/MS 10,15/33,445,23
103+3440/MS 10,15/33,76are 5.36
113+30,54/MS 20,15/311,0619,96
123+30,520/MS 20,15/311,2218,47
133+30,540/MS 20,15/311,5520,31
143+344/MS 20,15/3of 3.645,54
3+3420/MS 20,15/3of 3.646,99
163+3440/MS 20,15/32,667,38
173+30,54/3 MS0,15/312,5920,12
183+30,520/3 MS0,15/312,3719,65
193+30,540/3 MS0,15/312,8323,14
203+344/3 MS0,15/33,535,00
213+3 420/3 MS0,15/34,235,01
223+3440/3 MS0,15/34,106,16

Example 3:The Central layer of the packaging carton for liquid received and investigated on REP for water, as in Example 2. The results are shown in Table 4.

Table 4
No testST 1SAWS 2MSPLNP 1REP
(kg/
t)
(kg/t) /type(kg/
t)
(kg/t)/type(kg/t)/type(kg/t)water (kg/m2)
1 (EUR.)3+3--- 0,15/PL 1310,80
2
(EUR.)
3+32/SA 2--0,15/PL 134,06
3
(EUR.)
3+32/SA 1--0,15/PL 133,80
4
(EUR.)
3+32/SA 11-0,15/PL 133,66
53+32/SA 1-40/MS 10,15/PL 13of 3.56
63+32/SA 1120/MS 10,15/PL 133,42
73+32/SA 2-40/MS 20,15/PL 13the 3.65
83+32/SA 1-40/MS 20,15/PL 133,12
93+32/SA 1120/MS 20,15/PL 133,53
103+32/SA 2-40/3 MS0,15/PL 133,69
113+32/SA 1-40/3 MS0,15/PL 233,26
123+32/SA 11 20/3 MS0,15/PL 133,49
133+32/SA 1140/3 MS0,15/PL 132,90

Example 4:Sterilized cardboard with a weight of approximately 250 g/m2received in the device for forming sheet PFI, comes Hamjern Maskin A/S, Norway, from mass based on 100% bleached Kraft softwood fibers having a consistency of pulp of 1.88%. Add to the mass was done in the following time (in seconds) before dehydration:

75 sec, a Sizing agent AKD

60 sec, Microspheres Expancel™

45 sec, Cationic starch

30 sec, Cationic polymer

15 sec, Anionic colloidal solution of silicon oxide

0 sec, Dehydration

The cardboard sheets were pressed and dried in a cylindrical dryer at 140°C, causing heat treatment of the microspheres in a humid surrounding canvas paper and extending at least the unexpanded microspheres. Used the following methods.

Wet heat treatment: a cylindrical drum, 1 hour 85°C (still wet) + final drying, 140°C.

The samples were obtained as in Example 1, and examined for penetration into nearabout the s edge (REP) through steam treatment in an autoclave for 60 min at 130°C and 2 bar. The autoclave was a Certoclav TT 121, comes Certoclav Sterilizer GmbH, Austria. The results are shown in Table 5 levels added, calculated as in Example 1.

Table 5
no testST 1
(kg/t)
SA1 (kg/t)MS
(kg/t)/type
Retention system PL1/NP1REP, Pair
(kg/m2)
1 (EUR.)7-0,5/0,451,15
2 (EUR.)70,75-0,5/0,450,55
370,755/MS 20,5/0,450,44
470,7540/MS 20,5/0,450,28
5 0,755/1 MS0,5/0,450,40
670,7510/MS30,5/0,450,43
770,7540/3 MS0,5/0,450,40
870,7510/MS 40,5/0,450,40

Example 5:Sterilized cardboard was obtained as in Example 4, but with a mass based on 100% unbleached Kraft softwood fibers and consistency of the mass of 1.75%. Add to the mass was done in the following time (in seconds) before dehydration:

75 sec, a Sizing agent AKD

65 seconds, water-Resistant agent PAAE

55 sec, Microspheres Expancel™

45 sec, Cationic starch

30 sec, Cationic polymer

15 sec, Anionic colloidal solution of silicon oxide

0 sec, Dehydration

The cardboard sheets were pressed and dried in a cylindrical dryer at 160°C, causing heat treatment of the microspheres in dry or wet ambient canvas boom and and extending at least the unexpanded microspheres. Used the following methods.

Dry heat treatment: a cylindrical drum, 3 hours, 85°C (dry) + final drying, 160°C.

Wet heat treatment: a cylindrical drum, 1 h, 85°C (dry) + final drying, 160°C.

The samples were obtained and examined as in Example 1, and the penetration of the raw edge, REP, was investigated in two different ways.

1. REP, pair: Steam autoclave, 130°C, 60 min, 2 bar

2. REP, H2O2: Aqueous solution of 35% hydrogen peroxide, 70°C, 10 minutes

The results for dry heat treatment are shown in Table 6, while the results for the wet heat treatment is shown in Table 7 at the levels added, calculated as in Example 1.

Table 6
(Dry heat treatment)
no testST 2
(kg/
t)
SA 1
(kg/
t)
WS 1
(kg/
t)
MS 1
(kg/t)
Retention system
PL1/NP1
(kg/t)
REP,
pair (kg/m2)
REP,
H2O2(kg/m2)
1 (EUR.)7- --0,5/0,452,14of 7.64
2 (EUR.)70,375--0,5/0,450,602,04
3 (EUR.)7-20,5/0,450,45of 8.37
4 (EUR.)7--50,5/0,452,75to 7.32
570,375-50,5/0,450,412,17
67-250,5/0,450,40 to 6.43
770,375250,5/0,450,442,34
8 (EUR.)70,75--0,5/0,450,770,92
9 (EUR.)70,752-0,5/0,450,491,30
1070,75-50,5/0,450,470,85

Retention system
PL1/NP1
(kg/t)
Table 7
(Wet heat treatment)
no testST 2
(kg/t)
SA 1
(kg/t)
WS 1
(kg/t)
MS 1
(kg/t)
REP, H2O2(kg/m2)
1 (EUR.)7---0,5/0,4510,19
2 (EUR.)70,375--0,5/0,45is 3.08
3 (EUR.)7-2-0,5/0,45and 5.30
4 (EUR.)7--50,5/0,458,93
570,375-50,5/0,452,77
67-25 0,5/0,454,13
770,375250,5/0,452,42
8 (EUR.)70,75--0,5/0,451,29
9 (EUR.)70,752-0,5/0,45to 2.06
1070,75-50,5/0,451,21

Example 6:Sterilized cardboard was obtained as in Example 4, but with the consistency of the mass of 2.1%. Add to the mass was done in the following time (in seconds) before dehydration.

75 sec, a Sizing agent AKD

60 sec, Microspheres Expancel™

45 sec, Cationic starch

30 sec, Cationic polymer

15 sec, Anionic colloidal solution of silicon oxide

0 sec, Dehydration

The cardboard sheets were pressed and dried in the cylinder is practical dryer causing heat treatment of the microspheres in the wet grid environmental paper and extending at least the unexpanded microspheres. Used the following methods.

1. Cylindrical drum, 2 hours, 70°C (still wet)+ final drying, 140°C.

2. Cylindrical drum, 2 hours, 70°C (still wet) + final drying, 160°C.

The samples were obtained as in Example 4, and the penetration of the raw edge, REP, was investigated in two different ways.

1. REP, pair: steam autoclave, 130°C, 60 min, 2 bar

2. REP, water: water, 80°C, 3 hours

REP for vapor was investigated for samples dried at 140°C, and REP for water, for the samples dried at 160°C.

The results are shown in Table 8 at the levels added, calculated as in Example 1.

Table 8
no testST 1
(kg/t)
SA1
(kg/t)
MS
(kg/t)/ Type
Retention system PL1/NP1REP, pair (kg/m2)REP, water (kg/m2)
1 (EUR.)7--0,5/0,45of 2.21 of 9.21
2 (EUR.)70,75-0,5/0,450,532,30
370,755/MS 20,5/0,450,451,61
470,7510/MS 20,5/0,450,451,27
570,7520/MS 20,5/0,450,44of 1.57
670,7540/MS 20,5/0,450,271,05
770,7510/3 MS0,5/0,450,441,82

Example 7:/b> Sterilized cardboard was obtained as in Example 6. Add to the mass was done in the following time (in seconds) before dehydration:

75 sec, a Sizing agent AKD

60 sec, Microspheres Expancel™

45 sec, Cationic starch

30 sec, Cationic polymer

15 sec, Anionic colloidal solution of silicon oxide

0 sec, Dehydration

The cardboard sheets were pressed and dried in a cylindrical dryer, causing heat treatment of the microspheres in a humid surrounding canvas paper and extending at least the unexpanded microspheres. Used the following method.

Wet heat treatment: a cylindrical drum, 2 hours 70°C (still wet) + final drying, 140°C.

The samples were obtained and examined as in Example 1. The results are shown in Table 9 at the levels added, calculated as in Example 1.

Table 9
No TestST 1 (kg/t)SA1 (kg/t)MS (kg/t)/ typeRetention system PL1/NP1REP, H2O2(kg/m2)
1 (EUR.)7-0,5/0,45 23,17
2 (EUR.)70,75-0,5/0,450,88
370,755/MS 20,5/0,450,70
470,755/ 1 MS0,5/0,450,67
570,7510/3 MS0,5/0,450,68
670,7510/MS 40,5/0,450,77

Example 8:Sterilized cardboard with two layers, with a weight of approximately 290 g/m2got in a Dynamic Sheet Former (Formette Dynamic, comes Fibertech AB, Sweden) using 50% by weight based on 100% unbleached Kraft softwood fibers and consistency of mass 0.5% for forming the lower layer and using 50% by weight based on 100% bleached Kraft fibers of coniferous trees in the us and consistency of mass 0.5% for forming the upper layer. For both masses conductivity equal to 1.5 ICES/cm and the pH is approximately neutral.

Sheets of paper formed on a Dynamic Sheet Former by leveling mass from the mixing basin via a supply nozzle in a rotating drum on a film of water on top of the grid, spinning mass with the formation of the sheet, pressing and drying the sheet. Mass was added sequentially to form two layers in sterilized cardboard.

Add each of the masses were doing at the following times (in seconds) before pumping:

90 sec, Cationic starch

75 seconds, water-Resistant agent PAAE,

60 sec, a Sizing agent AKD

45 sec, Microspheres Expancel™

30 sec, Cationic starch

15 sec, Anionic colloidal solution of silicon oxide

0 sec, Pumping

The cardboard sheets were pressed and dried in the oven, causing heat treatment of the microspheres in a humid surrounding canvas paper and extending at least the unexpanded microspheres. Used the following method.

Dry heat treatment: drying, 20 min 105°C (dry) + final drying, 10 min 105°C.

The samples were obtained as in Example 1, and the penetration of the raw edge, REP, was investigated using:

REP, pair+water: steam autoclave to 130°C, 60 min, 2 bar + water 6°C, 10 minutes

Bending strength was measured according to SCAN P 29:95 using L&W Bending Resistance Tester, Type 16D comes Lorentzon & Wettre, Sweden. To the ratio of resistance to bending was calculated by dividing the resistance curve on the cube weight. The results are shown in Table 10 at the levels added, calculated as in Example 1.

Table 10
No TestST 2
(kg/
t)
WS 1
(kg/
t)
SA
(kg/
t)
/type
MS
(kg/
t/
Type
ST 3
(kg/
t)
NP1
(kg/
t)
REP,
pair (kg/m2)
The coefficient of resistance to bending (Nm6/kg3)
1 (EUR.)7---3-4,5715,9
2
(EUR.)
7-4/SA 3-30,451,2815,1
3
(EUR.)
7-4/SA 1- 30,451,0715,4
4
(EUR.)
74--30,454,4316,7
5
(EUR.)
744/SA 1-30,451,0815,5
67-4/SA 14/3 MS30,450,8416,0
77-4/SA 110/3 MS30,450,9216,4

From this it follows that it is possible to obtain as low penetration in raw CROs is ku, and high resistance to bending.

1. Sterilisable packaging laminate containing at least one primary layer create more gluing paper or cardboard, at least one barrier layer for liquid and at least one barrier layer for gas, with the specified paper or cardboard contain extended or expanding unexpanded thermoplastic microspheres.

2. The laminate according to claim 1, having the ability to withstand treatment with saturated steam at a temperature of from about 110 to about 150°C for a time from about 30 minutes to about 3 hours

3. The laminate according to any one of claims 1 and 2, in which paper or paperboard is made from pulp from coniferous wood.

4. The laminate according to claim 3, which includes a core layer of two-ply paper or paperboard, made from bleached and unbleached, respectively, Kraft pulp softwood.

5. The laminate according to any one of claims 1 and 2, in which paper or paperboard is coated with the composition containing a sizing agent selected from the group consisting of ketonovyh dimers and multimers, succinamic anhydrides and rosins, as well as containing polymer based on acrylamide.

6. The laminate according to claim 5, in which the polymer based on acrylamide is cationic.

7. The laminate according to any one of claims 1 and 2, in which the paper or cardboard contain moisture-resistant resin.

8. The laminate according to claim 7, in Kotor is m water-resistant resin selected from the group consisting of premineralization, polyamideimides and polyaminoamidazolines.

9. The laminate according to any one of claims 1 and 2, in which thermoplastic microspheres are expanded.

10. The laminate according to claim 9, in which thermoplastic microspheres are added as pre-expanded thermoplastic microspheres.

11. The laminate according to claim 9, in which thermoplastic microspheres added as unexpanded, thermally expanding microspheres that expand during the manufacture of paper or cardboard, with the specified paper or cardboard are still wet at the time of the extension.

12. The laminate according to claim 9, in which thermoplastic microspheres added as unexpanded, thermally expanding the microspheres during the manufacture of paper or cardboard, with the specified paper or cardboard are completely or almost completely dried up during the expansion.

13. A method of manufacturing a sterilized packaging laminate according to any one of claims 1 to 12, comprising the stage of applying at least one barrier layer for liquid and at least one gas barrier layer on a sheet or canvas sterilized paper or paperboard, containing extended or expanding unexpanded thermoplastic microspheres.

14. The use of sterilized packaging laminate according to Liu the WMD one of claims 1 to 12 for the manufacture of sealed packages for food or drinks.

15. Hermetic packaging for food or beverages made from sterilizable packaging laminate according to any one of claims 1 to 12.

16. A method of manufacturing a sealed package comprising a stage of formation of the container of sterilized packaging laminate according to any one of claims 1 to 12, the container is being filled food product or beverage and sealing the container.

17. The method according to item 16, further comprising heat treatment of the filled and sealed packaging.



 

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17 cl, 16 dwg, 1 tbl, 3 ex

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23 cl, 7 tbl, 5 ex

FIELD: process engineering.

SUBSTANCE: invention relates to production of perforated film packages. Perforated film package comprises at least three layers. Note here that at least one layer make inner layer with lower fusion temperature compared to those of two outer layers arranged on opposite sides of said inner layer. With film composition subjected to higher temperature, at least one inner layer gets softened to allow sealing of sufficient number of perforations in inner layer at compression to produce higher-efficiency moisture barrier in film composition. Layers of film composition features common center of perforations. Note here that every outer layer is formed by film containing at least one thermoplastic polymer, or by foamed thermoplastic material. Inner layer is made up of film containing at least one thermoplastic polymer, or of foamed thermoplastic polymer wherein at least one inner layer containing thermoplastic resin with Vicat softening temperature varying from 20°C to 150°C.

EFFECT: production of perforated moisture-resistant packages.

32 cl, 8 tbl, 6 dwg

FIELD: chemistry.

SUBSTANCE: polymeric film consists of a block-copolymeric peelable middle layer and at least one adhesive non-peelable surface layer. The middle layer makes up 95% of the thickness of the film. The surface layer contains a terpolymer of polyethylene/polypropylene/polybutylene and has thickness from approximately 0.1 mcm to approximately 1.5 mcm. An adhesive coating is deposited on the surface layer. The adhesive coating and/or surface layer is hot-sealable. The middle layer has at least one olefin component. The adhesive polymeric film has high adhesion capacity in a wide temperature range and peeling capacity. Bonded packaging is made from the polymeric film which contains a block-copolymeric substrate and adhesive coatings and/or surface layer are obtained on the substrate. The packaging is obtained by wrapping the packed article with the film such that at least one area for overlapping and hot-sealing is obtained.

EFFECT: adhesive region can be opened by manually separating overlapping sections of the film without breaking the film in or around the bonded region.

24 cl, 1 tbl, 1 ex

Multilayer bottle // 2415015

FIELD: process engineering.

SUBSTANCE: invention relates to multilayer bottle intended for beer, tea, juices or carbonated drinks. Proposed bottle comprises inner and outer layers, each made from polyether (A), and, at least, one barrier layer arranged there between. Polyether (A) is thermoplastic resin produced by polymerisation of dicarboxylic acid containing 80 gram-mol or more of terephthalic acid with diol component containing 80 gram-mol or more of ethylene glycol. Barrier layer contains the mix of polyamide (B) and polyamide (C). Polyamide (B) is produced by polycondensation of diamine component containing 70% gram-mol or more of m-xylylenediamine with dicarboxylic acid containing 70 gram-mol or more of α,ω-linear aliphatic dibasic acid with C4-C20. Polyamide (C) consists of poly(6-aminocaproic acid) and/or poly(hexamethylene diamine of adipinic acid), and amorphous semi-aromatic - copolymer of hexamethylene isophthalamide/hexametgyleneamide of terephthalic acid.

EFFECT: stronger interlayer adhesion, higher resistance to lamination, good gas tightness.

12 cl, 2 tbl, 8 ex

Multilayer bottle // 2411129

FIELD: process engineering.

SUBSTANCE: invention relates to multilayer bottle intended for tea, juices or carbonated drinks. Proposed bottle comprises outer layer, inner layer and barrier layer arranged there between. Outer and inner layer are made from polyether (A) produced y polymerisation of dicarboxylic acid component that contains 80 mol %, or more, of terephthalic acid with diol component containing 80 mol %, or more, of ethylene glycol. Barrier layer comprises polyamide (B) produced by polycondensation of 70 mol %, or more, of meta-xylylenediamine with 70 mol %, or more, or α,ω-collinear aliphatic dicarboxylic acid with 4-20 carbon atoms, and thermoplastic polymer (C).The latter is selected from the group consisting of phenoxy resin in the form of poly hydroxyl ester, polyglycol acid and polyamide oligomer with low molecular weight other than polyamide (B).

EFFECT: multiplayer bottle without delamination in flatwise fall.

8 cl, 3 tbl, 8 ex

FIELD: medicine.

SUBSTANCE: invention relates to medicine and to packing cover for absorbing product, cover includes protective layer. Invention differs because of the fact that cover includes also first functional layer, connected to protective layer, which gives to cover multifunctionality.

EFFECT: invention allows to improve process of changing absorbing product.

15 cl, 4 dwg

FIELD: construction.

SUBSTANCE: ventilation panel made of multilayer material comprises a layer having the first hole and adjacent layer having the second hole. Besides the first and second holes do not match with each other and are not substantially overlapping, forming ventilation channel. At the same time this channel mutually joins the first and second holes, thus providing for passage of fluid medium both from hole to hole and through ventilation panel outside. Device also comprises insulating channel connected to one of holes, thus providing for insulation as a result of fluid medium passage along and inside of insulating channel. Invention also relates to ventilation system, method of ventilation panel manufacturing, and also to method of box manufacturing and to insulating panel made of multilayer material. Besides application of this panel is also possible in other areas of equipment, where it may be useful.

EFFECT: creation of ventilation panel, which preserves heat of hot products and prevents formation of undesirable moisture inside package.

46 cl, 49 dwg

FIELD: paper industry.

SUBSTANCE: cardboard contains at least two layers: the first layer made of raw materials having high density and high module of elasticity; and the second layer to provide voluminousness for cardboard, in which the second layer contains chemical-thermomechanical pulp (CTMP) of broadleaf wood, cellulose and/or CTMP of coniferous wood at the specified ratio of components. At the same time coherence by Scott is achieved, making at least 80 J/m2; index of bending resistance making at least 5 Nm6/kg3 and strength in direction z, making at least 200 kPa. Invention also relates to products made of cardboard.

EFFECT: expansion of multilayer cardboard range and improvement of its quality.

15 cl, 8 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to lamination and laminate made thereby. Proposed method consists in direct impregnation by pressing of non-impregnated substrate material with non-impregnated decorative layer and one or more upper layers impregnated with polymer that feature intensity of effluent resin exceeding 8%. Method is implemented using short-cycle presses at 15 to 40 bar and 140 to 220 220°C. Intensity of effluent resin is determined by the formula

EFFECT: lamination by direct pressing using short-cycle presses with good quality of finished laminate surface.

13 cl, 3 ex

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