Packing material with polyolefin foam layer

FIELD: chemistry.

SUBSTANCE: film contains a primary layer (A) made from polyolefin foam, containing 0.5 to 25 wt % nucleating agent, layer (B) based on the same polyolefin as the primary layer, an optional adhesive layer (C), barrier layer (D) optionally impermeable for gases and/or smell, adhesive layer (E) and a thermosealing and/or laminated surface layer (F). Total thickness of layers (A) and (B) lies between 0.5 and 2 mm, and thickness of layer (B) ranges from 1/6 to 1/2 of thickness of layer (A). The said multilayer film is suitable for thermoshaping on shaping-packaging-thermo welding machines.

EFFECT: product has good mechanical properties.

17 cl, 1 ex, 2 tbl

 

The present invention relates to packaging and, in particular, to the packaging material with penopoliuretanovymi outer layer, which on one of its surfaces has other layers, and made of such packaging material packaging.

Packaging material foam layer, for example, polypropylene, manufactured in the form of quasiresonance, coiled into a roll of canvases used for the manufacture of termoformovannyh self-supporting packaging such as trays for food packaging. For these packaging materials can be recycled in this kind of packaging on the so-called form-fill-thermo-sealing machines, in which the cloth packaging material is first fed into a forming device, where it is molded remaining interconnected trays, which then placed the packaged product and then by heat sealing sealed with a film, preferably a transparent film. At the end sealed trays separated from each other.

The known packaging materials their penopoliuretanovyj layer at least on one of its surfaces has other layers. Such layers depending on their composition and thickness can serve to increase the rigidity of the packaging material, and/or to protect p the surface of the foam, and/or as a barrier to the penetration of gases and/or odors (volatile aromatic substances), and/or as a surface layer for sealing the filled product packaging tray closing his film, preferably a transparent film, by heat sealing.

Packaging materials with a layer of propanpropilen intended for the manufacture of packaging trays, by thermoforming, for example described in EP-A 0570222. Such packaging materials have a layer of foam and a multilayer film, which in some cases may contain a barrier layer, making the packaging material is not permeable to gases and odors. Such multilayer packaging material has not always necessary for a self-supporting packaging properties.

In EP-1117526 was proposed to complement the foamed layer is a dense layer of the same polyolefin, which is formed and a foamed layer, when a certain ratio between the thickness of both layers in order to improve the self-supporting properties of packings made of such packaging material, without increasing its thickness.

Despite the high suitability of such a packaging material for recycling in the packaging, for example by thermoforming, due to the constant increase of speed packaging machinamentum is a need to improve such packaging material to give it such properties, which would make it possible to process it in a package with high speed, i.e. with a shorter tact, without appearing at the same time, for example, non-uniformity in the wall thickness of the packaging containers and without deterioration of their mechanical strength, respectively, stiffness, and thus self-supporting properties.

This task is solved according to the invention with its proposed multilayer films with the following sequence of layers:

A) a primary layer of penopoliuretana containing, calculated on the whole of its mass from 0.5 to 25 wt.% at least one nucleating agent,

B) a layer based on at least one of the same polyolefin that forms the core layer (A),

In), optional interconnect layer based on a polyolefin, which is preferably the same monomer, which is the main monomer of the polyolefin constituting the core layer (A),

G) an optional adhesive layer,

D) optional not permeable to gases and/or odors barrier layer,

(E) adhesion layer,

G) optional heat sealable and/or peelable surface layer,

thus the total thickness of the layers a) and B) is from 0.5 to 2 mm, and the thickness of the layer B) is from 1/6 to 1/2 of the thickness of the layer (A).

In a preferred embodiment, the total thickness of the layers a) and B) is from 0 to 1.4 mm, and the thickness of the layer B) is from 1/6 to 1/3 of the thickness of the layer (A).

The main layer (A) (foam layer) is formed by at least one penopoliuretanom. For the manufacture of such packages, such as packaging trays for food packaging, the most suitable Homo - and/or copolymers penopropilena, since these materials are already at small thickness and low density have self-supporting properties. To obtain the base layer (A) can be used and mixtures of polyolefins. It is particularly suitable mixture of polypropylene with long-chain branches, with so high melt strength, and a copolymer of propylene with ethylene, such as heterophase block copolymers of propylene with ethylene. To obtain the base layer (A) is suitable, above all, a mixture of polypropylene with long-chain branches and a melt index (IL) in the range from 1.4 to 4.2 g/10 min (measured according to ISO 1133 in of 2.16 kg and 230°C) and heterophase blockcopolymer propylene with ethylene in the ratio of these components in a mixture

1:1.

The polyolefin forming the layer (A), it is possible to emulsify by adding solid, liquid and/or gaseous blowing agents in the usual quantities, preferably in quantities of from 0.5 to 3 wt.%. In this regard, you can refer to the publication EP-A 0570222 that those who amym included in the present description by reference and is part of it.

Layer (A) contains in terms of his weight from 0.5 to 25 wt.%, preferably from 2.1 to 20 wt.%, most preferably from 2.5 to 15 wt.%, at least one nucleating agent. The nucleating agent preferably is dispersive, the average particle size is from 4 to 20 microns.

As nucleating you can use all known solid nucleating, preferably a synthetic or natural inorganic compounds. Particularly preferable to use at least one nucleating agent selected from the group comprising talc, titanium dioxide, silicon dioxide, calcium carbonate, magnesium silicate, aluminium silicate, calcium phosphate and montmorillonite. It is most preferable to use as a nucleating agent talc.

The nucleating agent added to the polymer, which is necessary to emulsify to obtain from it the corresponding foam layer, preferably in the form of masterbatches, which contains from 30 to 60 wt.% the nucleating agent in the polymer, and before foaming evenly distribute it.

Obtained from the above-mentioned foamed material layer (A) is characterized by the presence of numerous cells with relatively low variation in their sizes. The specific number of cells prefer is Ino should not be less than 250 cells/mm 3more preferably not less than 300 cells/mm3most preferably up to 600 cells/mm3when the range of their sizes ±15%, preferably ±10%. The density of the foam layer (A) preferably should be from 0.35 to 0.55 g/cm3.

The density and the specific number of cells can also be varied by changing the process parameters, for example, changes in the manufacture of the foam layer, the preferred extrusion and foaming temperature extrusion or other process parameters.

The base layer B) of the solid polyolefin is predominantly at least one polyolefin, also forming foamed core layer (A). When this base layer is formed by penopolietilena or foamed mixture of polypropylene and a copolymer of propylene with ethylene, it is preferable that the basis dense polyolefin layer B) served as polypropylene or copolymer of propylene with ethylene. Most preferred in this heterophase block copolymers of propylene with ethylene. Measured above by the melt index is used to perform the layer B) of the polyolefin preferably should be between 1.8 to 5.5 g/10 min. Thickness of the layer (B) should be from 1/6 to 1/2, and most preferably from 1/6 to 1/3 of the thickness of the base layer (A).

Layer) preferably be provided in the case, when the layers G)-G) previously produced by means of coextrusion, preferably by coextruding sleeves blown, and then connect with the other layers of the multilayer film. The base layer B) is a polyolefin, preferably obtained from a monomer, which is also the main monomer of the polyolefin forming the foamed layer A). Therefore, when the layer (A) formed by penopolietilena and optionally a copolymer of propylene with ethylene, layer) may be formed of polypropylene, which optionally contains grafted parts of maleic anhydride. Together with the mentioned materials can also be used as additional components to use copolymers of ethylene with vinyl acetate. The thickness of the layer) preferably should be from 5 to 25 μm, most preferably from 8 to 15 microns.

The proposed invention is a multilayer film, which should have a low permeability, i.e. negligible permeability to oxygen and moisture and must be protected against the penetration of odors, contain a barrier layer D). This barrier layer is preferably made of a copolymer of ethylene with vinyl alcohol and ethylene content of 32 to 45 wt.%, preferably from 35 to 42 wt.%. The barrier layer E) can be connected provided on the corresponding surface of the adhesive layer is), accordingly, the connecting layer), respectively, thermovalve layer W). The barrier layer preferably is made of a copolymer of propylene, respectively, polyethylene grafted parts of maleic anhydride.

The surface layer W), which forms the 2nd outer layer proposed in the invention is a multilayer film, preferably is a heat sealable and/or peelable layer. With this in mind to perform such a heat sealable layer W), it is preferable to use either low-density polyethylene (LDPE) with a melt index in the range from 0.5 to 8.0 g/10 min, preferably from 1 to 5 g/10 min (measured according to ASTM D1238 at of 2.16 kg and 190°C)or ion meter, for example a copolymer of α-olefin with ethylene unsaturated carboxylic acid, from 20 to 100 mol.% carboxyl groups which are present in the form of a salt with a metal, preferably in the form of sodium salt or a copolymer of ethylene and vinyl acetate with a vinyl acetate content of from 3 to 10 wt.%, preferably from 4 to 6 wt.%.

In a particularly preferred embodiment, the heat sealable layer also perform peelable. To do this, as the material of such layer, it is preferable to use a mixture of LDPE and polybutylene (PB). The content of the polybutylene in such mixture preferably should be from 15 to 30 wt.%, bole is preferably from 20 to 28 wt.%. The melt index polybutylene should preferably be from 0.3 to 2.0 g/10 min (measured according to ASTM D1238 at 190°C. and 2.16 kg).

The thickness of the surface layer should preferably be from 10 to 50 μm, preferably from 15 to 30 microns.

When using LDPE as a polymer to perform a heat sealable layer W) and in the presence of the proposed invention in a multilayer film of the barrier layer for the connection between these heat sealable layer and the barrier layer, when it is made not of a copolymer of ethylene with vinyl alcohol, in a preferred embodiment, the necessary adhesion layer. The material of such an adhesive layer may be a polyolefin, preferably a polyethylene grafted parts of maleic anhydride. However, you can also use a mixture of LDPE and linear LDPE (LLDPE) with a ratio of between 3:1 to 4:1. The thickness of the adhesive layer should be from 2 to 8 μm, preferably from 3 to 6 microns.

The surface layer W) may contain the usual well-known antibiotics, antiadhesive and anti-caking (clumping), for example, erucic acid amide, polyalkyloxy, such as polydimethyl siloxane, and/or silicon dioxide.

All or only some layers of the proposed invention the multilayer films may contain stabilizers and the other additives known type.

In addition, the layer (B) may contain a white pigment in an amount from 0.5 to 2 wt.%, for example kaolin, calcium carbonate, talc, titanium dioxide or mixtures thereof. Such inorganic pigments are added to a polymer, which perform the layer B), preferably in the form of masterbatches containing from 30 to 70 wt.% the pigments.

In the manufacture of the proposed invention in a multi-layered film layers)-W) in the preferred embodiment, can be molded together with conventional method of producing films with coextruding sleeves with blown or the method of manufacturing a flat film coextrusions and then connect this sequence of layers, preferably extrusion lamination, with penopoliuretanovymi layer A). For this foamed layer a) and a multilayer film consisting of layers)-W), bring together, ekstradira between layer B). Immediately after extrusion to be manufactured laminate high enough to make interconnection layers of a)-F) clamping force.

Proposed in the invention is a multilayer film can also produce only using the extrusion method, in which the core layer (A) ekstragiruyut together with other layers, in some cases without layer), and simultaneously subjected to foaming.

Proposed in the invention is a multilayer film eminently suitable on the I thermoforming on the so-called form-fill-thermo-sealing machines where they can be recycled in the packaging container, preferably in forming, deep drawing packaging trays, which are then filled packaged product and sealed by heat sealing. With the invention it has been unexpectedly found that its proposed multilayer films allow their efficient processing on a form-fill-thermo-sealing machines for high speed operation and allow for comparison with the packaging material without proposed in the invention improvements up to 10% to reduce the quantum duration of their processing in the packing and thereby to 10% increase in the production of packaging trays without disturbing the uniformity of the thickness of their walls.

Proposed in the invention is a multilayer film unexpectedly have the best compared to known comparable unmodified packaging materials mechanical properties, especially higher stiffness, as measured by the modulus of elasticity in the longitudinal direction coinciding with the direction of movement of the film through the machine, and a higher voltage under tension. Such a significant improvement of the mechanical properties proposed in the invention of multilayer films is achieved in contrast to the known from the prior art multilayer films without zoom is of their thickness. In addition, made in the invention is a multilayer film packaging have a surface with a much smoother structure almost without typical foam cracking, thereby improving the usability and handling of such packages.

Accordingly another object of the present invention is the application of its proposed multilayer films as a packaging material, preferably by processing at its form-fill-thermo-sealing machines designed for packaging of food products, especially perishable foods such as meat, ham or sliced products. Since the packaging process on these machines often occurs in periodic mode for the possibility of their migration to the packaging of various products, packaging material must also retain the ability to thermoforming in a relatively wide range. Proposed in the invention, the packaging material satisfies this requirement because it has a high thermoformability, primarily the ability to molding, deep drawing.

Made of the proposed invention is a multi-layered film by thermoforming, preferably by deep drawing, packaging and the Delia, such as packaging trays, preferably molded, deep drawing packaging trays, after filling packaged product to seal a famous closing films. For applications such as the closing film suitable multilayer film, preferably, with the following sequence of layers: a layer of poly (ethylene terephthalate)/the layer of SiOx/adhesive layer/layer of low density polyethylene or with the following sequence of layers: a layer of polyethylene terephthalate/adhesive layer/layer of polyethylene/adhesive layer/layer of a copolymer of ethylene with vinyl alcohol/adhesive layer/layer of polyethylene.

Among the above closing films preferred first multilayer film of the first of these types. In the manufacture of such films first on the biaxially oriented layer of polyethylene terephthalate by the method of vacuum plasma spraying is applied a coating of SiOx. Then, this coating is laminated with the use of adhesion promoter pre-made plastic wrap. Such closing film is first and foremost characterized by high transparency and high bursting strength. In addition, the packaging of such closing their films have a high gas impermeability.

In the N. the same examples, the modulus of elasticity, accordingly, the voltage tensile determined according to ISO 527-2 in the longitudinal direction, respectively, in the transverse direction.

Examples

Example 1

The test proposed in the invention of the multi-layer film has the following sequence of layers:

layer (A), the foam layer with a density of 0.47 g/cm3and with a specific number of cells constituting 492 cells/mm3consists of a mixture of 50 wt.% polypropylene with long-chain branches (polypropylene with high melt strength), 46 wt.% heterophase blockcopolymer of propylene with ethylene and 4 wt.% superfine talc,

layer (B) formed on 100 wt.% heterophase blockcopolymers of propylene with ethylene, similar to blockcopolymer forming layer (A),

layer) is formed by a polypropylene

layer D) is formed by the adhesion promoter on the basis of polypropylene grafted parts of maleic anhydride,

layer D) is made in the form of a gas-tight barrier layer based on a copolymer of ethylene with vinyl alcohol,

layer (E) made in the form of adhesive layer similar to layer G),

layer W) made in the form of heat sealable layer on the basis of low density polyethylene.

Such a multilayer film produced by coextruding.

The thickness of the individual Stoev multilayer films are shown in table 1.

Table 1LayerA)B)In)G)D)E)W)TotalThickness in mm113026415555201444

The mechanical properties of such multilayer films are shown in table 2.

Comparative example 1

For comparison purposes using a multilayer film with the same as in example 1, the sequence of layers, each of which has the same composition and the same thickness, except for the layer (A), which polymer composition similar to example 1, but does not contain a nucleating.

The mechanical properties of the multilayer film of this comparative example are shown in table 2.

Table 2
Unit Comparative example 1Example 1
The modulus of elasticity (in longitudinal direction)MPa519703
The modulus in the transverse direction)MPa280280
Stress at elongation (longitudinal direction)MPa9,3to 12.0
Stress at elongation (transverse direction)MPa7,495
The duration of cyclesCycles/min89

From the table 2 data shows that proposed in the invention of the multi-layer film has much better mechanical properties in comparison with a multilayer film with unmodified foam layer (A).

1. Multi-layer film with the following sequence of layers:
A) a primary layer of penopoliuretana containing, calculated on the whole of its mass from 0.5 to 25 wt.% at least real the nucleating agent,
B) a layer based on at least one of the same polyolefin that forms the core layer (A),
B) optional connection layer based on a polyolefin, G) an optional adhesive layer, D) optional not permeable to gases and/or odors barrier layer,
(E) adhesion layer,
G) heat sealable and/or peelable surface layer,
thus the total thickness of the layers a) and B) is from 0.5 to 2 mm, and the thickness of the layer B) is from 1/6 to 1/2 of the thickness of the layer (A).

2. Multi-layer film according to claim 1, characterized in that the total thickness of the layers a) and B) is from 0.6 to 1.4 mm

3. Multi-layer film according to claim 2, characterized in that the thickness of the layer B) is from 1/6 to 1/3 of the thickness of the layer (A).

4. Multi-layer film according to one of claims 1 to 3, characterized in that the layer (A) is made on the basis of propanpropilen or foamed mixture of polypropylene with long-chain branches and a copolymer of propylene with ethylene, preferably heterophase blockcopolymer of propylene with ethylene.

5. Multi-layer film according to one of claims 1 to 3, characterized in that the layer
A) contains from 2.1 to 20 wt.%, preferably from 2.5 to 15 wt.%, nucleating agent.

6. Multi-layer film according to claim 5, characterized in that as a nucleating layer (A) contains at least one nucleating agent selected from the group, including the non talc, titanium dioxide, silicon dioxide, calcium carbonate, magnesium silicate, aluminium silicate, calcium phosphate and montmorillonite.

7. Multi-layer film according to one of claims 1 to 3, characterized in that the layer B) is made on the basis of polypropylene or copolymer of propylene with ethylene.

8. Multi-layer film according to one of claims 1 to 3, characterized in that the layer
B) is made on the basis of polyolefin, which is based on the same monomer, which is the main monomer penopoliuretana forming layer (A), preferably based on polypropylene.

9. Multi-layer film according to one of claims 1 to 3, characterized in that a layer D) is made on the basis of a copolymer of ethylene with vinyl alcohol.

10. Multi-layer film according to one of claims 1 to 3, characterized in that the layer F) is made on the basis of a heat sealable polymer, preferably low density polyethylene or ionomer, and optionally contains conventional additives.

11. Multi-layer film according to one of claims 1 to 3, characterized in that the layer F) is made on the basis of the peelable polymer, preferably based on a mixture of low density polyethylene with polybutylene, and optionally contains conventional additives.

12. Multi-layer film according to claim 1 or 2, characterized in that the total thickness of layers)-W) is from 20 to 70 μm, preferably from 30 to 50 microns.

13. The multilayer film inone one of claims 1 to 12 as a packaging material.

14. Packaging container, preferably packaging trays from a film according to one of claims 1 to 12.

15. Packaging container for 14 for packaging food products, preferably of solid food.

16. Packaging container according to § 15 for packaging meat, sausages and cheese.

17. The multilayer film according to one of claims 1 to 12 as a packaging material for form-fill-thermo-sealing machines.



 

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3 dwg

FIELD: chemical industry; methods of production of the multilayered microporous films.

SUBSTANCE: the invention is pertaining to the multilayered microporous films and, in particular, to the microporous films including at least two microporous film layers and to the method of production of the multilayered microporous films. The film layers may be produced with the controlled size of the pores to meet the needs the customer or for optimization of the different properties of the multilayered films. The technical result of the invention consists in creation of the improved microporous films and specially in development of such microporous films, in which may be achieved the combination of the desirable properties, and also in the method of production of such films. The indicated problem is being solved due to the fact, that the multilayered microporous film includes the first and the second coextruded film layers, where each film layer gains the microporosity at its drawing. At that the first film layer is made out of from the first polymeric composition containing the ethylene polymeric compound and the first pore-forming filler and has the first maximum size of the pores; and the second film layer is made out o the second polymeric composition containing the polypropylene compound and the second pore-forming filler and has the second maximum size of the pores differing from the first maximum size of the pores. At that the second layer containing polypropylene has no the free surface in the multilayered film and so the multilayered microporous film is impermeable for the liquids at the atmospheric pressure. The problem also is being solved due to usage of the different versions of the multilayered microporous films and the method of production of such films.

EFFECT: the invention consists in creation of the improved microporous films, specially in development of such microporous films with combination of the desirable properties and in the method of production of such films.

35 cl, 1 tbl, 4 ex, 19 dwg

FIELD: chemical industry; textile industry; production of the reinforcing material for the thermoreactive plastics.

SUBSTANCE: the invention is pertaining to the reinforcing material for the thermoreactive plastics. The reinforcing material consists of the connected in the form of the linen or the machine-sewn structure of the fibers, which are partially moved apart and magnified in their volume by insertion of the hollow beads between the fibers. The filaments of the magnified volume differ from each other by their substance and-or the degree of their volume increase. The invention provides for the method of manufacture of the reinforcing substance. The invention provides for the method of manufacture of the reinforcing substance and ensures production of the light-weight laminated materials of the heightened strength.

EFFECT: the invention provides for the method of manufacture of the reinforcing material and ensures production of the light-weight laminated materials of the heightened strength.

15 cl

FIELD: construction.

SUBSTANCE: water-proofing sheet comprises three layers. The first layer provides mechanical strength of the sheet and is made of elastometer polyethylene of high strength and flexibility. The second layer is intermediate one, represents the connection between the first and second layers, and is made of foam plastic with closed pores. The third layer is made of a impermeable plastic material which possesses high resistance to breaking. The tensile strength, breaking elongation, and thickness of the sheet range from 24 MPa to 39 Mpa, from 550% to 900%, and 3 mm to 50 mm, respectively.

EFFECT: enhanced reliability.

5 cl, 2 dwg, 3 tbl

FIELD: chemistry.

SUBSTANCE: invention is related to method for manufacture of combined elements, which consist of one protective layer and one rigid plastic foam on isocyanate basis, between which adhesion promoter is applied. Method provides for continuous displacement of protective layer with serial application of adhesion promoter on it and initial material for rigid plastic foam on isocyanate basis. Adhesion promoter is applied by means of rotary disc installed preferably parallel to protective layer in horizontal plane or with deviation from it that does not exceed 15°.

EFFECT: produced elements have high adhesion strength.

24 cl, 2 tbl, 3 dwg

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