Laminated packing material for packing container to be sterilized

FIELD: food industry; packing.

SUBSTANCE: invention relates to packing material containing base paper or cardboard layer for packing container formed by bending and welding the sheet, or flat blank of packing material. Laminated packing material has base paper or cardboard layer and outer coatings from both sides of base layer made of thermoweldable polymer impermeable to liquids. Said paper or cardboard base layer is made water-repelling by sizing the mass by water dispersoid solution or emulsion of alkylketene dimer or mixture of alkylketene dimers so that content of alkylketene dimer (dimers)in base layer is from 0.25 to 0.4 by dry weight, weight %. Invention contains description of method of manufacture of laminated material and packing container to be sterilized.

EFFECT: provision of laminated packing material protected from penetration of hot steam or liquid designed for packing food products and capable of withstanding heat treatment in autoclave at high humidity and temperature without separation of packing material into layers.

6 cl, 2 dwg

 

The present invention relates to a packaging material containing a base of paper or paperboard layer, for sterilized packaging container.

The above type of packaging laminated material is known, for example, from international publication WO 97/02140. Known packaging material has a rigid, but bendable base or inner layer of paper or paperboard and outer, impermeable to liquid coating of heat-resistant plastic on both sides of the base layer. Between the base layer and one of the two outer plastic coating may be additionally provided gazoballonnyj layer, for example, of aluminum foil to make the packaging material impermeability for gases, in particular oxygen gas.

Such packaging materials are also described in international publications WO 97/02181 and WO 98/18680.

Known packaging materials finished packaging containers produced using modern packaging and filling machines of the sheet, or from prefabricated blanks of packaging material form, fill and seal ready packaging. For example, preparation, packaging container produced by the method, according to which the blank is first formed into the shape of a tubular container shell, in which both food is lnyh the edges of the blank are bent and are firmly connected with each other TermoSanitari with obtaining the overlap, which continues along the entire length between the two open ends of the tubular container shell. Then one end of the container shell give essentially flat end shape (bottom) by folding and heat sealing the adjacent end panels of the container shell. Container shell with sealed so the end (with bottom) is filled with the desired content, for example a food product, through its other, open end, which, after the operation of filling, give similar, essentially flat end shape (top) the final bending and sealing the respective end panels filled container shell.

It has long been known that the shelf life of food products may be extended if the product is subjected to heat sufficient to destroy, neutralize or reduce bacteria, fungi and other undesirable microorganisms in the food product. For complete sterilization of this heat treatment should be conducted so that all parts of the processed food product is heated to such a level and for such a period of time, which ensure the complete destruction or inactivation of microorganisms in the food product.

Heat treatment, prolonging the shelf life of the packaged food product, usually carried out in AB is oklava, which is a device containing an enclosed chamber for processing, in which the temperature and pressure can be regulated and monitored during the heat treatment. Preferably, such a heat treatment or autoclaving is conducted in the manner and in conditions which are described in more detail in the publication WO 98/16431, which is incorporated in this description by reference. Filled containers are placed in the space of the autoclave for processing, and then heating the gaseous medium, e.g. hot steam, is introduced into contact with the outer walls of the packaging container for heating the packaged food product to a pre-selected temperature processing, which typically range between 70 and 130°C. Packed food product is maintained at this temperature for a given, sufficiently long time to ensure essentially complete destruction of microorganisms present in the food product. Then the processed food product is cooled by a refrigerant such as cold water, to a temperature close to or slightly above ambient temperature, i.e. up to 25-30°C, after which the stop processing and packaging containers removed from the autoclave.

To achieve complete sterility different foods require different forms of those whom morabadi. Some foods require more intensive heat treatment, that is, higher processing temperatures and/or longer treatment period than for other food products, which need a short stay at a relatively low temperature processing to achieve the specified sterility.

The packing container of the above known packaging laminated material is usually sufficiently mechanically strong and resistant to withstand such relatively mild or less intensive heat treatment, however, known packing containers often damaged, destroyed and become completely unusable, if the heat treatment is carried out at a relatively high temperature processing and/or for a relatively long period of time that is sometimes required to guarantee the full and absolute sterility of certain types of food.

The problem that often occurs in connection with such excessive, rigid heat treatment, is that the liquid or moisture strive to penetrate into the paper or cardboard layer of the packaging container in areas where the cut edge of the paper or cardboard layer more or less open to the influence of gaseous heating medium, e.g. hot steam. Such persons shall NGOs are sensitive to moisture and high temperature region of the packaging container continues along the open cut ends, which runs along the entire length between the two ends of the tubular container shell, i.e. between the top and bottom of the packaging container. The penetration of moisture or liquid in especially severe cases can cause swelling and delamination of the walls of the packing and, thus, make it unattractive, or completely unsuitable for further processing.

Previous attempts to solve the above described problem with cut edges, absorbing moisture and liquid, were based on how to protect or close to these edges chemically by impregnation with a water-repellent substance or mechanically by cutting and re-bending, as described in the publication WO 98/18680. Although these methods of the prior art solves the problem of penetration of vapor and liquid, they require at least one additional operation and, thus, the availability of appropriate additional equipment in the production of packaging material.

One of the objectives of the present invention is to eliminate the above disadvantages of the prior art.

Another objective of the present invention is to create a laminated packaging material for a packaging container that can reliably withstand the heat treatment in the autoclave without the risk of damage due to the penetration of steam is whether liquid, even if heat treatment is carried out at elevated temperature processing and/or for a long period of treatment in the autoclave.

These and other problems are solved in accordance with the present invention by the fact that the packing material described in the introduction has the features specified in the characterizing part of paragraph 1 of the attached claims.

The advantages and preferred variant of the packaging material according to the invention set forth in dependent clauses attached claims.

In accordance with this invention proposes a packaging laminated material to be sterilized packaging container comprising a paper or paperboard layer, which gives the hydrophobicity by gluing mass.

As the paper or cardboard layer is made hydrophobic by gluing mass, initially has sufficient protection against the penetration of vapor and liquid, the hydrophobic layer of paper or cardboard in the packaging material according to the invention does not require additional chemical or mechanical agents to protect exposed cut edges. Therefore, the packaging material according to the invention can be converted into packaging simple way, using existing equipment without the use of additional stages of the working cycle and soo the relevant additional equipment in the production process.

The paper or cardboard layer is made hydrophobic, according to the invention can be obtained by gluing mass using alkylating dimers, dispersed or emulsified in an aqueous solution. Practical examples of such aqueous dispersions or emulsions contain alkylbetaine dimers with 16-22 carbon atoms in their fatty residue.

In a particularly preferred variant of the invention, the packaging material includes a paper or paperboard layer, which was made hydrophobic by means of a water dispersion or emulsion alkylating dimer containing oily residue from 18 carbon atoms. Aqueous dispersion or emulsion alkylating dimer with 18 carbon atoms not only provides high absorption alkylating dimers paper pulp and, thus, the full closing of the pores (hydrophobicity) in the resulting layer of paper or cardboard, but this desired high absorption can be carried out without interfering with the subsequent transportation and processing of paper pulp in paper-making machine.

Preferably, the layer of paper or paperboard in packaging material according to the invention includes alkylcatechols dimer in the amount of more than about 0.25 wt.% from the dry weight of the paper or cardboard layer. In other words, the number alkylating dimer is preferably more than 2.5 kg that is well paper or paperboard, but should not be more than approximately 4 kg, which is the maximum allowed amount for use in food packaging.

The present invention is described below in detail with reference to the accompanying drawings, in which:

Fig. 1 is a schematic view in cross section of the packaging laminated material according to the invention,

Fig. 2 is a cross - section of the packaging laminated material according to one preferred practical executions of the present invention.

In Fig. 1 thus schematically presents a cross-section of the packaging material in the simplest implementation of the present invention. Packaging material, indicated generally by item 10, includes a base or inner layer 11 of paper or paperboard and outer impermeable to liquid coatings 12 and 13 of the heat sealable plastic on both sides of the base layer 11.

The base layer 11 attached to the hydrophobicity by sizing the mass with water dispersion or emulsion alkylating dimer or a mixture alkylating dimers with different number of carbon atoms in the respective fatty residues, preferably between 16 and 22 carbon atoms. In one particularly preferred embodiment, the base layer 11 is made hydrophobic by sizing the mass with water dispersion or emulsion alkylating Dima is and 18 carbon atoms in its fatty residue.

The number alkylating dimers in the base layer 11 may vary, but preferably is at least about 0.25 wt.% from the dry weight of the base layer. In cases where the packaging material 10 according to the invention is suitable for contact with food product, the number alkylating dimer, however, should not exceed 0.4 wt.% from the dry weight of the base layer 11. In other words, the number alkylating dimer is preferably 2.5 to 4 kg per ton of paper or paperboard in dry base layer 11.

The two outer material impervious to liquid polymer coatings 12 and 13 is preferably thermovalve polymer, to facilitate the production of finished sterilized packaging containers. Examples of such thermovalve plastics for use in the two outer impermeable to liquid coatings 12 and 13 include, but are not limited to, polyethylene (PE), polypropylene (PP), polyester (PET), and their copolymers. Examples used polyethylene polymer can be polyethylene high density (HDPE) or linear polyethylene with a low density (LLDPE), and an example of the used polymer-based complex of the polyester may be amorphous complex polyester (APET).

In Fig. 2 schematically shows a cross-section of the packaging material in accordance with one preferred option from the retene. The packaging material 20 has a base layer 21 of paper or paperboard and outer, impermeable to liquid coatings 22 and 23 on both sides of the base layer 21.

Further, in the packaging material 20 has gazoballonnyj layer 24 between the base layer 21 and one of the two outer, impermeable to liquid coatings 22.

Between impervious to liquid coating 22 and gazoballonnym layer 24 has a layer of adhesive 25 through which is impervious to liquid coating 22 is connected to gazoballonnym layer 24.

Between gazoballonnym layer 24 and base layer 21 has a layer of laminating or sealing substance 26 of this nature to gazoballonnyj layer 24 was connected to the base layer 21 is large enough and stable binding force, so that this connection is not loose or not was completely lost when the packaging material 20 is subjected to extremely high thermal loads, that is, temperatures up to about 130°C or higher.

The outer impermeable to liquid coating 23 on the other side of the base layer 21 may have a decorative pattern 27 of the respective printing ink, in turn, protected by a transparent layer 28 applied over decorative figure 27 and consisting of an appropriate varnish or other agent to protect decorative figure 27 from external influences.

the La impart packing material 20 more integrity, between gazoballonnym layer 24 and layer lamination or sealing agent 26 has a layer of adhesive 29 through which gazoballonnyj layer 24 is connected to the layer lamination and/or sealing agent 26.

The base layer 21 is given the hydrophobicity by gluing mass aqueous dispersion or emulsion alkylating dimer or a mixture of alkylating dimers with different number of carbon atoms in the respective fatty residues, preferably between 16 and 22 carbon atoms. In one particularly preferred embodiment, the base layer 21 is made hydrophobic by gluing mass aqueous dispersion or emulsion alkylating dimer with 18 carbon atoms in its fatty residue.

The number alkylating dimer in the base layer 21 can vary, but preferably is at least about 0.25 wt.% from the dry weight of the base layer 21. In cases where the packaging material 20 according to the invention is suitable for contact with food products, the number alkylating dimer, however, should not be more than about 0.4 wt.% from the dry weight of the base layer 21. In other words, the number alkylating dimer is preferably 2.5 to 4 kg per ton of paper or paperboard in dry base layer 21.

The outer impermeable to liquid coating 23 may be a polymer selected from the group, mainly the way, including polyethylene (PE), polypropylene (PP) and polyester (PET), or a mixture thereof. Examples used polyethylene polymer can be polyethylene high density (HDPE) or linear polyethylene with a low density (LLDPE), an example used polypropylene polymer can be oriented polypropylene (OPP), and the example used polymer-based complex of the polyester may be amorphous complex polyester (APET).

Preferably impermeable to liquid coating 23 consists of physical or mechanical mixture of polypropylene (PP) and polyethylene (PE), which, in addition to the excellent characteristics of density, preventing the penetration of liquid, also has sufficient moisture and heat resistance to withstand such significant moisture and terminography that arise during normal, prolonging the shelf life of the heat treatment in the autoclave. The outer coating 23 of a physical or mechanical mixture of polypropylene (PP) and polyethylene (PE), also great for printing and at the same time to obtain mechanically strong and water-proof connection with the so-called heat sealing when converting packaging material 20 in sterilized packaging container.

Similarly, the outer impermeable to liquid coating 22 may consist of a polymer which is selected from the group mainly comprising polyethylene (PE), polypropylene (PP), complex polyester (PET), and their copolymers. Examples used polyethylene polymer can be polyethylene high density (HDPE) or linear polyethylene with a low density (LLDPE), an example used polypropylene polymer can be oriented polypropylene (OPP), and the example used polymer-based complex of the polyester may be amorphous complex polyester (APET).

Preferably impermeable to liquid coating 22 is composed of a copolymer of propylene and ethylene, which is enough moisture and heat resistant to withstand considerable moisture and dermonecrosis caused by normal, extending graney heat treatment in an autoclave. In addition, the coating on the basis of a copolymer of propylene and ethylene contributes to obtaining a mechanically durable and waterproof connection with the conversion of the packaging material 20 in sterilized packaging container.

Layer 24 serving as a gas barrier may consist of organic or inorganic material. The example used inorganic material can be a metal, such as aluminum foil or a coating of silicon dioxide, obtained by plasma deposition, and an example of a suitable organic material can b the th so-called barrier polymer, for example, a copolymer of ethylene and vinyl alcohol (EVOH).

Preferably, gazoballonnyj layer 24 is an aluminum foil, which, in addition to the excellent characteristics of density, prevents the penetration of gases, in particular oxygen gas, also contributes to the connection of the packaging material 20 induction TermoSanitari, which is a simple, but fast and effective way of connection.

A well-functioning sterilisable packaging containers according to the invention receives the above-described method of packaging material by folding and heat sealing, and packing containers can be securely termoobrabotannyj in conditions of very high humidity and temperature in the autoclave without delamination of the packaging material due to exposure to water and steam penetration in which the base layer, which gives the hydrophobicity, through the exposed cut ends effectively prevented.

1. The packaging laminated material to be sterilized packaging container obtained by bending and welding of sheet or flat blanks of packaging material, and laminated packaging material (10; 20) includes a base layer (11; 21) of paper or paperboard and outer is not permeable to liquid coating (12, 13; 22, 23) of the heat sealable polymer is both sides of the base layer (11; 21), characterized in that the specified paper or paperboard base layer attached to the hydrophobicity by gluing mass aqueous dispersion or emulsion alkylating dimer or a mixture alkylating dimers, so that the content alkylating dimer (dimer) in the base layer on a dry weight basis ranges from 0.25 to 0.4%.

2. The packaging laminated material according to claim 1, characterized in that the paper or paperboard base layer (11; 21) contains from 2.5 to 4 kg alkylating dimers per ton of paper or paperboard in a dry paper or paperboard base layer (11; 21).

3. The packaging laminated material according to claim 1 or 2, characterized in that the said alkylbetaine dimers selected from the group mostly contains alkylbetaine dimers with 16-22 carbon atoms in their respective fatty residues.

4. The packaging laminated material according to claim 3, characterized in that the said alkylbetaine dimers contain 18 carbon atoms in their fatty residue.

5. A method of manufacturing a laminated packaging material which requires the use of a paper or cardboard layer (11; 21), which gives the hydrophobicity, as the base layer in the laminated packaging material (10; 20), by sizing the mass of the aqueous dispersion or emulsion alkylating dimer or a mixture alkylating dimers so that the content alkylating dimer (dimer) in the base layer on a dry weight basis ranges from 0.25 to 0.4%.

6. Sterilized packaging container from the packaging laminated material containing a base layer (11; 21) of paper or paperboard and outer is not permeable to liquid coating (12, 13; 22, 23) of the heat sealable polymer on both sides of the base layer (11; 21), characterized in that the specified paper or cardboard layer (11; 21) given the hydrophobicity by gluing mass aqueous dispersion or emulsion alkylating dimer or a mixture alkylating dimers, so that the content alkylating dimer (dimer) in the base layer on a dry weight basis ranges from 0.25 to 0.4%.



 

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