Cap of the packing tare, the method of manufacture such cap and the packing tare sealed by it

FIELD: chemical industry; light industry; other industries; production of the caps for the packing tare sealing.

SUBSTANCE: the invention is pertaining to production of the caps used for the packing tare sealing. The cap is made with the capability of its fixation by means of the thermal welding to the opening of the hermetic bowl and the subsequent its opening. At that the cap contains the layer of the fibrous material, the polymeric layer, the barrier layer concerning the oxygen and the polymeric thermosealing layer. At that the thermosealing layer contains: the copolymer of ethylene and methylacrylate, the copolymer of ethylene and vinylacetate and the polyamide wax. The thermosealing layer is fixed directly on the barrier layer in relation to the oxygen layer having the more higher fusion point - all without any intermediate binding agents. The presented invention also concerns to the method of manufacture of the cap, and also the hermetic bowl supplied with the above-mentioned cap, and to the method of manufacture of the above- mentioned bowl. The invention ensures manufacture of the cap attached by the thermal method and easily opened, besides, the given cap may be manufactured by extrusion within the limits of one operation, and also to diminish the number of the polymeric layers applied one over another.

EFFECT: the invention ensures manufacture of the cap attached by the thermal method and easily opened, besides, the given cap may be manufactured by extrusion within the limits of one operation, and to diminish the number of the polymeric layers applied one over another.

17 cl, 5 dwg, 3 ex

 

The technical field to which the invention relates.

The present invention relates to a cover for which you can thermogenetic (sealing by heat sealing) of openings sealed containers (i.e. packaging) and tear when opening the specified capacity. Cover contains fibrous material layer in the form of a polymer layer, a barrier against oxygen, and polymer termokompensiruyuschie layer. In addition, the invention relates to a method of manufacturing a cover, to a method of manufacturing a sealed container, the lid closed and sealed containers, obtained using this method.

The level of technology

Thermogenesis open cover apply in various embodiments, consumer packaging, made in the form of a corresponding air-tight container. A typical package includes consumer and disposable packaging containing liquid, wet, or oily foods. The item is packaged products includes milk, sour milk, yoghurt and other dairy products, juices, water, desserts, nutritious fats, such as butter and margarine, as well as food fast food. Similarly packaged dry products and products having the form of a powder or particles, such as medication.

Packaging container or tank, sealed termogeneriruyuschee cover, often made of plastic, such as polypropylene or polystyrene, cardboard, coated with polymer, or glass. The cover material is aluminum, however, there are problems associated with the fact that this cover has a tendency to tear when opening sealed containers and, in addition, does not decompose in the areas of waste disposal. As an alternative cover material, eliminating these problems, applied polymer coated paper or cardboard. Polymer layers in the cover provided sufficient mechanical strength required for the product, the tightness with respect to oxygen and odors, as well as good opportunities for thermogenetic and tearing of the cover, respectively, at the closing and subsequent opening sealed containers.

Polymer coated cover for sealed containers were made, producing the first film of polyethylene terephthalate laminated through termogeneriruyuschee varnish, and then attaching the specified film to paper or cardboard by gluing. However, the use of such a two-step process of obtaining the specified polymer film as an intermediate product is some inconvenience.

In the description of the international application WO 92/04187 see the other pic is b manufacturing termogeneriruyuschee and open the lid sealed containers. He is the imposition of a polymer layer, forming a polymer coating on top of each other on the paper during a single phase of the joint extrusion. The coating consists of a layer of the binder layer, the barrier against oxygen, the second layer binder, and thermogenesis layer. The layers in the order placed on the lower side of the paper, and this way, ultimately, will form the inner surface of the cover. As materials specified barrier layer in the description mentioned polyethylene terephthalate (PET), a copolymer of ethylene and vinyl alcohol (EVOH)and polyamide (PA). For thermogenesis layer serves mixture, which contains polyethylene, modified methacrylic acid and vinyl acetate and carry out the function of the bonding component, and a copolymer of ethylene and methacrylic acid, functioning as a separating component. Further, in the description of the patent Finland No. 104887 presents-coated cover sealed containers, and in this case the problem of curvature that exists for the cover, described in document WO 92/04187, decide mixing layer, a barrier against oxygen, crystalline and amorphous polymers. Described in this document the inner surface of the paper three-layer coating which contains layer, barrier against oxygen, binder and termokompensiruyuschie layer located in the specified order.

Disclosure of inventions

The problem solved by the present invention is the development of a cap designed for sealed containers made of paper or paperboard coated with the polymer. For the specified cover shall be provided the opportunity to attach its thermal image (i.e., by heat sealing) and tear, as well as to produce through co-extruded polymer layers in a single operation. In addition, the proposed device cover can reduce the number of polymer layers on top of each other. The invention is characterized by the presence thermogenesis layer containing a mixture of a copolymer of ethylene and methyl acrylate (EMA)copolymer of ethylene and vinyl acetate (EVA) and polyamide wax, and that termokompensiruyuschie layer sticks (fixed) without any binder directly to the barrier against oxygen layer having a higher melting point.

When developing the present invention it has been unexpectedly discovered that, despite the large difference between the melting points of the polymers specified polymeric material in thermogenesis layer may stick, i.e. Phi is to sirovatka itself, in the process of joint extrusion, the most commonly used polymers, barrier against oxygen, i.e. polyethylene terephthalate, polyamide and a copolymer of ethylene and vinyl alcohol. Therefore, it will be necessary to use between the barrier and thermogenesis layers, the layer of any binders known from the prior art.

It was proved that the mixture of EMA, EVA and polyamide wax according to the invention provides good thermogenetic in relation to the materials of various types, such as plastic, paper, or paperboard, coated or uncoated polymer, and glass.

Particularly preferred variant embodiment of the invention includes a reliable sealing (i.e. sealing) freeze boxes, tins or cups, covered with PET through termogeneriruyuschee cover. It should be noted that when applying thermogenesis materials known from the prior art, such sealing would be problematic.

Thermogenetic can be carried out when temperatures at which the barrier against oxygen layer remains intact, i.e. not allowing percolation through thermogenesis system, which could cause a possible worsening of the safety of the product. It was observed the Sabbath., that tight tank withstands freezing: not observed separation of the cover or percolation through the area thermogenetic.

Although the invention is not limited to the use of EMA, this polymer in termogeneriruyuschee mixture clearly performs the function of providing the possibility of tearing of the cover. EVA fixation (adhesion) thermogenesis layer to layer, the barrier against oxygen, as well as the adhesion of the sealant to the surface in contact with the cover when providing the possibility to separate the cover from the surface. Experiments have shown that in the absence of EMA and EVA cover loses its working properties, i.e. in other words, the presence of both of these components required. Polyamide wax necessary to ensure technological parameters of the mixture, according to the tests in the balance of the mix it is 0.8%. In the case of the use of a smaller quantity of the wax mixture sticks to the tools and prevents rolling of covering materials. Polyamide wax also provides a contribution to facilitate the tearing of the cover. As a cheaper filler to the mixture of the polyolefin. According to the invention in a mixture of polymers polymer thermogenesis (sealing) layer the proportion of polyamide wax, EVA and EMA are in the interval for the lah, accordingly, 0.8 to 5%, 20-50% and 10-30%. The remainder of the mixture can consist of a polyolefin, such as polyethylene or polypropylene.

Polymer coating of the cover according to the invention in a preferred embodiment, may be a simple two-layer coating containing layer, a barrier against oxygen, and termokompensiruyuschie layer. However, if necessary, the first of these layers may consist of multiple layers formed of different barrier polymers. For example, it may be adherent to each other the layers of EVOH and PA.

In the case where the material layer, a barrier against oxygen, using PET or PA, own weight of such a layer may lie in the range of 10-70 g/m2and in the most preferred interval of 20-40 g/m2. If the packaging material is EVOH, the mass layer may be in the range of 5-25 g/m2; here are the most preferred intervals of 10-20 g/m2. In turn, termokompensiruyuschie layer may have a weight in the range of 5-30 g/m2most preferably 10-20 g/m2.

According to the invention the layer of fibrous material may consist of paper with a mass of 30-120 g/m2preferably 40-80 g/m2or cardboard with a weight 130-600 g/m2preferably 220-300 g/m2. Cover paper is suitable for sealing relative to the mA is anicich Cup or glass, while the cover is on the basis of cardboard particularly suitable as an inner cover sealed container having the shape of a box.

Proposed according to the invention a method of manufacturing the above-described cover is made with the possibility of attaching by means of heat sealing and tear, characterized by the fact that the fibrous material is covered through co-extruded in a single operation the two polymer layers, adhering to the fibers and to each other. One of these layers forms a layer, a barrier against oxygen and other forms termokompensiruyuschie layer, providing the possibility of tearing of the cover. This layer contains a mixture of EMA, EVA and polyamide wax. Polymer layers can be ekstradiroval in the form of an endless film on the tape of fibrous material, and then a separate cover form, slitting or long stamping found on the tape.

The method according to the invention, intended for the manufacture of a sealed container essentially comprises attaching the cover by heat sealing around the opening of the vessel. The cover includes a layer of fibrous material, a polymer layer, a barrier against oxygen, and termokompensiruyuschie layer adhering directly to the specified barrier layer without the use of promezhutochnogo the binder. Termokompensiruyuschie layer contains EMA, EVA and polyamide wax. This layer provides the possibility of tearing of the cover when opening sealed containers. The temperature of heat sealing can be varied in the range of 150-190°C. At these temperatures the sealing does not cause holes in the barrier against oxygen layer, which is made of PET, EVOH or PA and respectively having melting points above 160°C.

A sealed container according to the invention is characterized by the fact that it contains a container located in the container Packed product and the lid is attached by heat sealing to the opening of the container. The cover is formed from a layer of fibrous material adjacent polymer layer, the barrier against oxygen, and thermogenesis layer forming the inner surface of the cap and sticky (fixed) directly to the specified barrier layer without using any intermediate binders. Termokompensiruyuschie layer contains a mixture of EMA, EVA and polyamide wax, allowing you to tear off the lid when opening sealed containers. In the food airtight containers according to the invention, such as beverage containers, milk products, nutritious fats or food fast food container is usually p is ecstasy a box or glass, made of plastic or paperboard, coated inside and/or outside. In airtight containers having the form of a box, or in air-tight containers that contain a packing container made of glass, thermogenesis cover in the typical case is open the inner cover inside the outer case recorded by means of screwed or snap.

Brief description of drawings

Hereinafter the invention will be explained in more detail with reference to the accompanying drawings, on which:

figure 1 illustrates a Cup with a lid according to the invention,

figure 2 illustrates in sectional view in an enlarged scale a fragment of the holes presented in the previous figure Cup with a demonstration of heat sealable seam between the hole and cover,

3 and 4 illustrate the layered structure of the cover for two different combinations of materials

figure 5 illustrates the joint extrusion and adhesion of the polymer layer to the tape of fibrous material in the manufacturing process of the cover.

The implementation of the invention

Figure 1 as an example, presents the product-tight tank according to the invention, which is shaped in the form of Cup 2, provided with a cover 1. Contents 3 such containers typically represents water, juice, milk or dairy products is, for example yogurt. Shown in figure 2 the cover is securely attached by heat sealing to the framing flange 4 of the Cup 2. The cover has a tongue 5, which you can pull to remove it and open the sealed container.

Figure 3 and 4 as the example shows a three-layer structure 6-8 are presented in figure 2 cover. The cover 1 includes a paper layer 6 with a mass component, for example, 40-80 g/m2. It forms the outer surface of the cover. As shown in figure 3, the inner polymeric cover layer consists of 7 PET with a mass selected, for example, in the range of 20-40 g/m2and thermogenesis layer 8, which forms the inner surface of the cover 1 sealing capacity (i.e. package) and has a mass selected, for example, in the range of 10-20 g/m2. In this embodiment termokompensiruyuschie layer 8 may contain, for example, at least, polyamide wax, about 20% EMA, approximately 40% EVA, and the rest is a polyolefin. For the specified layer 8 a suitable material is Mormelt 84 supplied by the company Rohm & Haas and having a density of 0,955 g/m2the melting point of 74° and a melt index of 45 to 55 g/10 minutes

The combination of the layers of the cover 1 in figure 3 and 4 differ from each other only by the fact that in the second case, as the material of the layer 7, the barrier against kislorod,instead of PET EVOH used, with mass layer, for example, 10-20 g/m2.

In addition to the cups and glasses made of plastic or coated cardboard, presented in figure 3 and 4 the material of the cover is also suitable for sealing containers having the form of a box and made of plastic or cardboard, in particular as internal open the lid sealed containers or as such remove the inner covers for sealed containers in a glass container. In the inner lids of boxes instead of paper 6 is preferable to use the cardboard, the mass of the layer which is, for example, in the range of 220-300 g/m2

As shown in figure 5, the cover material is made by a continuous process in which the polymer layer 7, the barrier against oxygen and polymer termokompensiruyuschie layer 8 together ekstragiruyut on the endless moving paper or cardboard tape 6. This tape is subjected to pre-treatment by corona discharge 9. Polymer layers 7 and 8 are connected in the extruder 10 and in the form of a homogeneous film 12 are served from the tip of the nozzle 11 to the gap between the rollers 13, 14, rotating together with paper or cardboard tape 6. Simultaneously with the movement of the tape rolls squeeze the layers together. Thus, this process forms a cover material in the form of an endless belt 15 from which p is a means of cutting or stamping receive cover individual packaging tar.

Example 1

A layer of PET with a weight of 20 g/m2applied to the wrapping paper with a mass layer 90 g/m2and on this layer imposed termokompensiruyuschie layer (Mormelt 804), the weight of which amounted to 15 g/m2. From the thus obtained paper, polymer coated, cut the piece to form the cover of the food package having the shape of a box and is made of polystyrene. Attached the cover to the outlet box by thermogenetic for 2 at the welding temperature 175° C. Between polystyrene and thermogenesis layer Mormelt was obtained tight sealing. To open the box, the lid without disturbing its integrity, removed from said hole.

Applying packaging boxes, made of polyethylene and polypropylene, repeated the test, with the same result.

Example 2

Cut a piece of the data obtained in example 1 wrapping paper coated with the polymer, and by a heat seal formed from a lid for opening of the glass container. The duration and temperature of the weld were respectively 2 and 175° C. During welding layer Mormelt cover tightly attached to the glass surface of the hole of the container. To open the container, the lid without disturbing its integrity, removed from said hole.

Example 3

Packing cardboard with a mass of words is 255 g/m 2covered with a layer of PET, which weight was 40 g/m2. Made of coated cardboard, using cuts, produced box designed for nutritious fats, which layer PET was the internal surface. On a similar packing cardboard was also coated by joint extrusion of a layer of PET and upper thermogenesis layer (Mormelt 804). The weight of these layers were respectively 20 g/m2and 15 g/m2. Cut a piece of cardboard with double-layer coating by heat sealing formed from his hole cover boxes for nutritious fats. The duration and temperature of the weld were respectively 2 and 175° C. During welding termokompensiruyuschie layer Mormelt firmly attached to the floor PAT on framing the flange of the box. To open it, the lid without disturbing its integrity, removed from said hole.

Using a box made of uncoated cardboard packaging, repeated the test, with the same result.

For professionals in this field should be obvious that the application of the invention is not limited to the above examples and can be modified within the boundaries of the attached claims.

1. Cover (1)made with attached by heat sealing to the hole sealed e the bone (2) and tear when opening sealed containers containing layer (6) of fibrous material, a polymer layer (7), the barrier against oxygen and polymer termokompensiruyuschie layer (8), characterized in that termokompensiruyuschie layer (8) contains a copolymer of ethylene and methyl acrylate (EMA)copolymer of ethylene and vinyl acetate (EVA) and polyamide wax, and termokompensiruyuschie layer fixed directly on a barrier against oxygen layer (7)having a higher melting point, without any intermediate binder.

2. Cover according to claim 1, characterized in that the polymer coating on the fibrous material (6) consists only of the specified barrier against oxygen and thermogenesis layers (7, 8).

3. Cover according to claim 1, characterized in that the polymer in barrier against the oxygen layer (7) is a polyethylene terephthalate (PET), a copolymer of ethylene and vinyl alcohol (EVOH) and/or polyamide (PA).

4. Cover according to claim 3, characterized in that the containing PET or PA layer, a barrier against oxygen, has a weight in the range from 10 to 70 g/m2, preferably from 20 to 40 g/m2.

5. Cover according to claim 3, characterized in that the containing EVOH layer, a barrier against oxygen, has a weight in the range from 5 to 25 g/m2preferably from 10 to 20 g/m2.

6. Cover according to claim 1, characterized in that thermogenesis the second layer (8) has a weight in the range from 5 to 30 g/m 2preferably from 10 to 20 g/m2.

7. Cover according to any one of the preceding paragraphs, characterized in that the layer (6) of fibrous material is made of paper having a weight in the range from 30 to 120 g/m2preferably from 40 to 80 g/m2.

8. Cover according to any one of claims 1 to 6, characterized in that the layer (6) of fibrous material made of cardboard having a weight in the range from 130 to 600 g/m2preferably from 220 to 300 g/m2.

9. A method of manufacturing a cover (1), as claimed in any of the preceding paragraphs, made with the possibility of attaching by means of heat sealing, characterized in that the fibrous material (6) is covered through co-extruded in a single operation the two polymer layers (7, 8), adherent to the fibers and to each other, one of these layers forms a barrier against oxygen layer (7), and other forms termokompensiruyuschie layer (8), providing the possibility of tearing of the cover and containing a mixture of a copolymer of ethylene and methyl acrylate (EMA)copolymer of ethylene and vinyl acetate (EVA) and polyamide wax.

10. The method according to claim 9, characterized in that the polymer layers (7, 8) ekstragiruyut in the form of an endless film on a moving tape (6) of fibrous material, and cover (1) is recovered from the resulting tape (15) through virezani is or stamping.

11. A method of manufacturing a sealed container, characterized in that the cover (1) attached by heat sealing around the opening of the packaging container (2), the lid contains a layer (6) of fibrous material, a polymer layer (7), the barrier against oxygen, and termokompensiruyuschie layer (8), adhering directly to the barrier against oxygen layer without intermediate binders, and termokompensiruyuschie layer contains a mixture of a copolymer of ethylene and methyl acrylate (EMA)copolymer of ethylene and vinyl acetate (EVA) and polyamide wax and made with the possibility of tearing of the cover when opening sealed capacity.

12. The method according to claim 11, characterized in that the temperature of heat sealing lies in the interval from 150 to 190°C.

13. Tight tank, manufactured using the method according to claim 11 or 12, wherein the sealed container includes a container (2), a packaged product (3)in the container (2), and cover (1)attached by heat sealing around the opening of the container, the lid consists of a layer of fibrous material located underneath the polymer barrier against oxygen layer (7) and thermogenesis layer (8), forming the inner surface of the cover and is fixed directly on a barrier against oxygen layer is without any intermediate binder substances and termokompensiruyuschie layer contains a copolymer of ethylene and methyl acrylate (EMA)copolymer of ethylene and vinyl acetate (EVA) and polyamide wax and provides the possibility of tearing of the cover when opening sealed containers.

14. Capacity on p. 13, characterized in that the container is a box, a Cup or a glass, made of cardboard and coated inside and/or outside.

15. Capacity on p. 13, characterized in that the container is a box, a Cup or glass, is made of plastic.

16. Capacity on p. 13, characterized in that the container is made of glass.

17. Tank according to any one of p-16, characterized in that it is a sealed container placed in her food.



 

Same patents:

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SUBSTANCE: proposed packing contains one or more cans and box. Each can is provided with flexible tearoff lid fitted on can by thermal welding. Said lid is made easy to remove. Box is fiber material based sheet placed around cans. Sheet is provided with cuts to receive upper seam of cans and hold them in place. Box protects can lids and holds cans making it possible to take them out of box. Cans can be made of size providing one time feeding of pet and contain feed differing in taste and smell.

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55 cl, 7 dwg

The vessel // 2238891

The invention relates to a sealing device for a container provided with a hole, and this device is of a type that contains the sheet, welded around the edges of the openings of the container

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FIELD: packing means, particularly containers.

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12 cl, 3 dwg

FIELD: construction materials industry; other industries; production of the plates produced by the direct lamination.

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3 cl, 2 dwg

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12 cl, 5 dwg, 4 tbl, 3 ex

FIELD: food industry; packages.

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8 cl, 4 dwg

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FIELD: laminated material for manufacture of packaging containers by folding and thermal sealing and packaging containers for liquid food products manufactured from said material.

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8 cl, 4 dwg

FIELD: food industry; packages.

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EFFECT: improved structural and mechanical stability of material and articles made of such material, simplified technology of production of material and reduced cost of production.

14 cl, 2 dwg

FIELD: pulp-and-paper industry; methods of production of the laminated paper of the high density and the high oxygen permeability.

SUBSTANCE: the invention is pertaining to the field of the pulp-and-paper industry, in particular, to the barrier substance and the method of its realization. The method allows to produce the laminate of the paper coated with the polyolefin, at that the paper is manufactured out of the wet fibrous mass, which is not enabled to dry before manufacture of the paper, and before the polyolefin application on the paper - the paper is modified in such a manner that its surface energy has changed approximately up to the value equal to the surface energy value of the polyolefin. The presented method ensures the manufacture of the barrier substance with the stable quality and the good barrier properties with respect to the gas and may be used for packaging, in particular, for the food products.

EFFECT: the invention ensures the manufacture of the barrier substance with the stable quality and the good barrier properties with respect to the gas and may be used for packaging, in particular, for the food products.

12 cl, 5 dwg, 4 tbl, 3 ex

FIELD: construction materials industry; other industries; production of the plates produced by the direct lamination.

SUBSTANCE: the invention presents the plate of the direct lamination. The purpose of the invention is creation of the plate of the direct lamination, so that in it the graphics image of the relief shall correspond to the relief reconstruction of its surface. At that it is possible to use the hot pressure moderate for the decorative layer. The plate is manufactured by the method of the hot pressing of the core with the resin-saturated absorbing layers including the surface with one decorative layer containing the graphics image of the surface of the imitated material. The plate also contains the deposited on the decorative layer transparent covering layer with the relief reconstitution of the surface structure of the imitated material. Between the decorative layer and the core there is the intermediate resin-containing layer made in the form of the prefabricated separate adhesive layer with the saturating resin. The given version has the technological advantages at manufacture of the plates of the big dimensions, and also allows to manufacture the plates having the structured surfaces, at that the structure precisely coincides with the graphics image of the below located decorative layer.

EFFECT: the invention ensures creation of the plate of the direct lamination, which graphics image of the relief precisely corresponds to the relief reconstruction of its surface and the given version has the technological advantages at manufacture of the plates of the big dimensions.

3 cl, 2 dwg

FIELD: packing means, particularly containers.

SUBSTANCE: laminated material 30 comprises rigid bendable substrate 31 made of paper or cardboard, external water-tight coverings 32, 33 and aluminum gas-barrier foil 34 located between substrate 31 and one external covering 32. Laminated material comprises at least one additional layer 35 used as gas-barrier between substrate 31 and aluminum foil 34. Additional layer 35 is connected to substrate 31 through intermediate or adhesive layer 36. External coverings 32, 33 and intermediate or adhesive layer 36 are made of polypropylene. Packing container and product packing method with the use of the container are also disclosed.

EFFECT: possibility to prevent or compensate container gas losses through aluminum foil cracks or similar tightness failure caused by stresses, especially by ones appearing during container production of described packing material.

12 cl, 3 dwg

FIELD: chemical industry; light industry; other industries; production of the caps for the packing tare sealing.

SUBSTANCE: the invention is pertaining to production of the caps used for the packing tare sealing. The cap is made with the capability of its fixation by means of the thermal welding to the opening of the hermetic bowl and the subsequent its opening. At that the cap contains the layer of the fibrous material, the polymeric layer, the barrier layer concerning the oxygen and the polymeric thermosealing layer. At that the thermosealing layer contains: the copolymer of ethylene and methylacrylate, the copolymer of ethylene and vinylacetate and the polyamide wax. The thermosealing layer is fixed directly on the barrier layer in relation to the oxygen layer having the more higher fusion point - all without any intermediate binding agents. The presented invention also concerns to the method of manufacture of the cap, and also the hermetic bowl supplied with the above-mentioned cap, and to the method of manufacture of the above- mentioned bowl. The invention ensures manufacture of the cap attached by the thermal method and easily opened, besides, the given cap may be manufactured by extrusion within the limits of one operation, and also to diminish the number of the polymeric layers applied one over another.

EFFECT: the invention ensures manufacture of the cap attached by the thermal method and easily opened, besides, the given cap may be manufactured by extrusion within the limits of one operation, and to diminish the number of the polymeric layers applied one over another.

17 cl, 5 dwg, 3 ex

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