DE3605400A1 - Readily openable packaging, and process for the production thereof - Google Patents

Abstract

A readily openable packaging which is suitable for foodstuffs such as ring sausage and the like comprises a first layer (ply) having a heat-sealable coating of ethylene-vinyl acetate copolymer and an ionomer and a second layer having a heat-sealable coating of an ionomer. The resultant pack has good self-welding properties and seal strength and a readily openable seal.

Description

description

The invention relates to packaging, and more particularly to packaging laminates for food.

Usually goods like food are turned into thermoplastic Foils or laminates packed to protect the goods to be packaged from damage and contamination to protect from the outside, and to provide adequate and durable packaging for the Ensure transport and sale to the end user.

Typical thermoplastic packaging films and laminates that use the desired protection from damage and other desired properties of the finished Ensure packaging are usually designed to provide tight heat-seal seams when they are sealed together around the goods. These materials can after heat sealing and evacuation from the consumer or end user often can only be opened with difficulty. There is therefore a need for one Packaging material that provides adequate protection of the goods against environmental pollution, Moisture and air guaranteed and sufficiently strong heat-sealed seams, about the cohesion of the packaging across the distribution channels and storage and at the same time to create a heat seal that separates from the Easily opened for consumers or end users, i.e. easily separated or peeled apart can be. This easy opening feature avoids the pack with a knife or another Tools are torn apart must if the use of the goods is desired.

There is also a need for a packaging material with the above advantages, which also has self-welding capabilities, so that the Packing of goods such as food, for example, in a thermoforming process an upper and a lower laminate around the goods in the abutting areas be joined together by self-welding, creating a sufficiently strong Adhesion between the laminates ensures the cohesion of the packaging and that the packaged goods are protected during the distribution cycle.

In US-PS 3,655,503 a package is made of a composite heat sealable thermoplastic film shown having an outer and an inner Layer, wherein the interlaminar bond strength is relatively low. These Foil is used by wrapping it around the goods to be packaged; the foil is then attached to itself by heat sealing along overlapping seams. Ionomers are suitable resins for the outer layer and the inner layer. If that Ionomer is used as the inner layer, then it is used in conjunction with polypropylene used. In contrast, according to the present invention, there are two different Layers used to package the goods by thermoforming or other suitable means. In US Pat. No. 3,655,503, an easy-to-open heat-seal seam is described, at which comprises the heat seal zone, the bonded outer layers of the overlapping film, ruptures first on opening, followed by delamination along the interface is used between an outer and an inner layer. At the end of the heat sealing zone will the outer layer torn again to allow the packaging to peel apart to complete.

The tearing and delamination can occur more than once across the heat seal zone take place while opening. This font only shows the use of one single resin in the outer or an inner layer; in contrast shows the present invention is a mixture of resins in a first or molded Location.

In US Pat. No. 4,178,401 there is a self-sealing packaging film described in which the inner or self-welding layer is a mixture of ethylene vinyl acetate copolymers with different melt flow indices.

Mixtures of ionomers showing low melt flow with ethylene vinyl acetate copolymers, showing high melt flow are also described, but these latter mixtures show poor self-welding ability. An easily separable heat-sealed seam is not shown.

In US-PS 4,382,513 a package with a separable Heat-sealed seam described, with unoriented foils being irradiated to the Adjust the bond strength of the resulting heat seal. Ionomers from Ethylene and ethylene vinyl acetate copolymers are possible sealing layers of the thermoplastic Films used in this irradiation process.

The object of the invention is to create a packaging which is made from materials which comprise sealing layers made of incompatible materials, whereby an easy-to-open sealing seam is to be ensured. The object of the invention also includes the creation of a packaging for foodstuffs which has a first layer and a second layer which are self-welded to one another along their abutting surfaces. ßen are connected, includes. The object of the invention also includes the creation of packaging for foodstuffs which has good self-sealing properties and good sealing strength and which can nevertheless be easily separated both over the self-welded areas and the melt-sealed areas of the pack.

The object of the invention is easily separated by an Packaging released, which is characterized by a first layer, which is a sealing layer comprised of a mixture of ethylene vinyl acetate copolymer and an ionomer, and a second layer comprising a sealing layer of an ionomer, the first and second layers on their abutting surfaces by self-welding are connected to each other and enclose food.

According to a further aspect, the invention relates to a packaging which is characterized by a first and a second layer which enclose a foodstuff, the first and the second layer being connected to one another on their abutting surfaces by self-welding and the feature of easy separability being provided which is based on two different control mechanisms. The first mechanism in the self-sealing area of the package has to do with the incompatibility between the sealing layers of the first and second layers. The second mechanism in the melt sealing area has to do with the delamination of the bond between an ionomer sealant layer from one of the plies and an adjacent layer of ethylene vinyl acetate copolymer in the same ply.

In the following the invention is explained in more detail with reference to figures; They show: FIG. 1 a plan view of a packaging according to the invention, FIG. 2 a Side view of a packaging according to the invention, FIG. 3 a cross section through the packaging according to the invention according to FIG. 1 along the line III-III, FIG. 4 a schematic representation of the melt seal area of the package at the beginning des Auftrennens, Figure 5 is a schematic representation of the path along which the Packaging is separated during opening, and FIG. 6 shows a schematic representation the packaging after opening the melt seal area of the packaging has gone through.

"Easily separable" and similar terms are used in accordance with the invention used in such a way that they relate to a package and especially to the heat-sealed one and self-welded areas of packaging that can be easily separated without having to pull or tear on the packaging materials, which leads to premature Destruction of the packaging and undesired contamination of the contents of the packaging can lead.

An easily separable packaging can be torn without that you have to use a knife or other tool to pull the packaging tear open.

"Self-welding" and similar terms are used in accordance with the invention used to refer to materials which are bonded together by contact welding adhere and welded during normal distribution in trade without the application of external forces stay. This self-adhesive or contact welding is made possible by the strength of the Maintained weld seam alone and does not rely on external forces that affect the Press foil sheets or packaging walls together.

"Fusion seal" and similar terms are used in accordance with the invention used to denote a seal or a sealed seam, for example along the edge of the packaging, which is exposed to heat and pressure is made for sufficient time to seal the surfaces of the respective Layers to fuse together.

The term "ionomer" is used in the present invention to mean that refers to metal salts of ethylene-acrylic acid or methacrylic acid copolymers, which have pendant carboxylate groups with monovalent or divalent Cations, such as zinc or sodium ions, are associated.

In the following, reference is made to the figures. The package 10 has a first layer 12 which is a shaped layer which is thermoformed or otherwise suitable techniques known to those skilled in the art is prepared. To the appropriate Thermoforming processes include, for example, the vacuum forming process or the punch-assisted vacuum forming processes. In the vacuum forming process, the first layer is heated, for example, by contact heating, and a vacuum is created below the layer, which causes the location is pressed down into a preformed die by atmospheric pressure. In the punch assisted vacuum forming process, after the first or the layer to be formed has been heated and sealed over a die opening is, a punch, the shape of which is similar to the shape of the die, towards the forming sheet, and after the vacuum is created, the formed sheet steps on the Die surface over.

After the molded sheet is in place, a commodity 14, such as by manual filling, placed on top of the formed layer, and a second, essentially Unformed layer 16 is spread over the goods and heated with a hot plate. Release of the vacuum causes this sheet to adhere to the formed sheet is so that the goods are enclosed between the layers and the first and the second Layer connected to their abutting surfaces by self-welding will. At a sealing station the packaging is evacuated and with a sealing device, e.g.

a heated top jaw or clamping jaw, melt-sealed. the first or shaped layer encloses a substantial part, generally more than half of the goods to be packed.

The first and second layers can be made from a shrinkable material be made, i.e. of a material that orientates by stretching, for example and when the temperature of the film or laminate is increased on the product shrinks. The packaging can be treated by keeping the heat in shape briefly exposed to hot air or hot water or steam to the shaped Shrink the laminate around the goods so that they fit snugly and are wrinkle-free Packaging is received, and also to ensure that the Sealing surfaces, i.e. the self-welded ones in contact with one another Areas 18 are firmly adhered to each other so that excellent clarity and clarity Resistance to loss of packing vacuum is achieved in the event that that the packaging material is exposed to stitches.

According to the preferred embodiment according to the invention, a first or molded sheet made of unoriented material, on shrinkage on the goods to be packaged after thermoforming and after hot air or exposed to hot water.

After the first and second layers are self-welding to each other have been connected and preferably before the shrinkage measure described above is carried out, the peripheral edge of the packaging is sealed, such as through a heating jaw using procedures known to those skilled in the art.

This edge or fusion seal seam 20 is on the actual one The edge of the packaging or near it. According to a preferred embodiment of the invention is part of the edge region running around the packaging extended so that an outer flap 22 is formed, which is a means for easy Represents opening the package. The abutting surfaces of the first Layer 12 and the second layer 14 are not complete in the area of this outer flap sealed together, whereby the use of the easy opening mechanism according to the invention is facilitated by having a suitable means of pulling the packaging apart provides.

The laminate of the first or molded ply 12 comprises a seal seam layer, which is a mixture of one Ethylene vinyl acetate copolymer and a Contains ionomer.

The ethylene vinyl acetate copolymer preferably contains between about 6% by weight and 20% by weight vinyl acetate. The ionomer is preferably a zinc ionomer, like Surlyn 1705 available from DuPont Company, but it may as well be a Be sodium ionomer. The ratio of ethylene vinyl acetate (EVA) to the monomer can be from about 50% EVA / 50% ionomer to about 99% EVA / 1% ionomer.

The laminate comprising the second, substantially unformed ply 16 also comprises an ionomer sealing surface, and preferably from a zinc ionomer such as Surlyn 1702, also available from the DuPont Company is. The ionomers of the first and the second layer can optionally be the same.

This ionomer layer on the second layer is preferably a relative one thin layer. In particular, the sealing layer has a thickness between approximately 508 μm and 12.7 µm, most preferably about 7.62 µm. The second layer also includes one a layer of an ethylene vinyl acetate copolymer adjoining the ionomer layer. A preferred EVA contains between about 2.5 wt% and about 6 wt% vinyl acetate. The ionomer layer and the EVA layer directly adjoining it are preferred coextruded.

The easy opening mechanism of the present invention works as follows. The first and second layers are formed during thermoforming or the like Process connected to one another by self-welding at their abutting surfaces and enclose the goods, such as a ring sausage or other food. This Self-welding takes place at a relatively low temperature. Then will a melt seal seam on the edge of the pack or near it formed at relatively high temperature, i.e. at temperatures higher than those that come into consideration in the self-welding stage.

Two mechanisms regulate the easy separability of the received Pack (see FIGS. 4 to 6). The first mechanism is based on the liability between the sealing layer 24 of the first layer 12 and the sealing layer 26 of the second layer 16. Given the relatively low temperatures that occur during self-welding Apply, the first and the second layer with their abutting surfaces firmly attached to each other. When applying a relatively high temperature to the peripheral area of the packaging fuse the sealing layers 24 and 26 of the first and second Situation with each other.

So it becomes the EVA / ionomer blend of the first or molded layer fused to the monomer of the second layer in the melt seal area. The second The mechanism of interest is the bond between the sealing layer 26 of the second or unmolded layer and the directly adjacent EVA layer 28. If the sealing layer 26 is relatively thin, preferably between 5.08 µm and 12.7 µm and in particular is kept at about 7.62 µm, then the bond is between the sealing layer 26 and the directly adjacent EVA layer 28 are strong enough to maintain the cohesion packaging and delamination during the distribution cycle to prevent, and still provide a "pull out" layer if so desired is to open the package. This is made possible by the fact that the bond between the seal layer 26 and the adjacent EVA layer 28 in the melt seal area the packaging is weaker than the adhesion between the sealing layer 26 and the sealing layer 24 is the first or shaped ply. If so, the packaging to open, then leads to the opening of the packaging beginning at the outer flap 20 for pulling apart the first and second layers at the interface between the seal layers 24 and 26 to the point where the fusion seal meets will. As the separation continues, starting at this point, from which the first and second layers are fused to one another, the sealing layer 26 delaminated from the directly adjacent EVA layer 28 only in the heat seal area. On further separation, this delamination leads to a "tear-out" as shown in FIG Figures 5 and 6 is shown. After the packaging has delaminated in the Melt seal area will begin if the package continues to tear again the opening in the first manner described above, i.e. between the sealing layers 24 and 26 of the first and the second layer, so that e.g. in the self-welded Area 18 between the goods and the melt-sealed seam (see FIG. 1) the separation the first from the second layer in turn due to the incompatible sealing surfaces 24 and 26 of the first and second position is regulated.

An important feature of the molded sheet according to the invention is that the interlaminar bond strength of the layers that make up the formed ply, must be greater than the adhesive strength of the sealing layers of the first and second Location. This is necessary in order to understand the possible mechanisms for splitting on the above, i.e. to the separation of the incompatible sealing layers or delamination along the ionomer / ethylene vinyl acetate interface of the not molded location.

For the sake of convenience, the second layer is referred to as "Unformed" Location, although it can be said that in fact a certain formation of this Location takes place during thermoforming or a similar process.

So it is a packaging created in a shrinkable Laminate packaging by combining two methodologies the characteristic of lightness Opening inserts; the first methodology is through incompatibilities between the mirror layers of the molded and the non-molded layer determined, and the second through controlled delamination of the sealing layer and the directly adjacent ones EVA layer guaranteed in the non-molded layer.

According to a more preferred embodiment according to the invention the first or molded layer is a first layer of polypropylene, a second or a Tie layer, a third layer made from a blend of linear polyethylene low density and ethylene vinyl acetate copolymer, a fourth or tie layer, a fifth or barrier layer of ethylene vinyl alcohol copolymer, a sixth or Tie layer, a seventh layer made from a blend of linear polyethylene low density and ethylene vinyl acetate copolymer and an eighth or sealing layer from a mixture of ethylene vinyl acetate copolymer and an ionomer.

The second or unformed layer preferably includes a first Layer of nylon, a second layer of an adhesive, a third layer made of ethylene vinyl acetate copolymer and a fourth or sealing layer made of a monomer. The second or non-molded layer can also be a layer of vinylidene chloride / vinyl chloride copolymer include.

According to a further embodiment preferred according to the invention, the second or non-molded layer has a first layer of polypropylene, a second or tie layer, a third layer of ethylene vinyl acetate copolymer, a fourth or tie layer, a fifth layer of ethylene vinyl alcohol copolymer, a sixth or tie layer, a seventh layer of ethylene vinyl acetate copolymer and an eighth, or sealing, layer of an ionomer.

The first or shaped sheet described above is preferred made by coextrusion in ways known to those skilled in the art.

The second or non-molded layer can be made by lamination are used, for example, in the embodiment described above of nylon and an adhesive; it can alternatively according to the second embodiment above including the first layer made of polypropylene and the subsequent layers will.

The preferred embodiment according to the invention of the first or shaped Layer has one polypropylene layer, preferably about 5.08 µm thick, a second or tie layer of about 10.16 µm, a third layer of a mixture of linear low density polyethylene and ethylene vinyl acetate copolymer of about 25.4 / zum, a fourth or tie layer of about 7.62 µm, a barrier layer of about 11.43 µm, a sixth or tie layer of about 7r62 a seventh Layer made from a blend of linear low density polyethylene and ethylene vinyl acetate copolymer of about 25.4 µm and a sealing layer of a blend of ethylene vinyl acetate copolymer and an ionomer of about 21.59 µm.

According to their first described above, preferred according to the invention Embodiment, the second or non-molded layer has the following preferred ones Thicknesses on: in the first or nylon layer about 19.05 µm in the second or adhesive layer about 2.03 µm, in the third layer of ethylene vinyl acetate copolymer about 44.45 µm and about 6.35 µm in the sealing layer.

According to the second preferred according to the invention described above Embodiment of the second or non-molded ply has the first layer Polypropylene a thickness of about 12.70 / µm. The second or tie layer has a thickness of about 5.08 / to, the third layer of EVA of about 16.51 / to, the fourth or tie layer of about 5.08 µm, the fifth layer of ethylene vinyl alcohol copolymer of about 8.89 µm, the sixth or tie layer of about 5.08 µm, the seventh Layer of EVA of about 15.24 µm and the eighth or sealing layer of about 8.89 µm.

According to the preferred embodiments according to the invention, the first or molded layer has a first layer of polypropylene. A suitable one Polypropylene is available from Northern Petrochemical Co. and is called Norchem NPP 2085GW sold. The second layer is an adhesive and can be a terionomer be, for example a branded product resin based on ethylene vinyl acetate, the available from DuPont as the CXA E162.

The third layer is a mixture of preferably about 40% by weight linear low density polyethylene such as Dowlex 2045 available from Dow Chemical Co. is available. The other part of this mixture is preferably the third layer from about 60 wt.% of an ethylene vinyl acetate copolymer, in particular an EVA with about 9 weight percent vinyl acetate content, such as LD-318.92 EVA resin available from Exxon Chemical is available. The fourth or Adhesive layer is preferred an adhesive like that used in the second layer.

The fifth, or barrier, layer is an ethylene vinyl alcohol copolymer. A suitable example is EVAL EC-F101, available from the American EVAL Company is available.

The sixth or adhesive layer is preferably the same as the one which is used as the second and fourth layer. The seventh layer is a mixture linear low density polyethylene and ethylene vinyl acetate, preferably similar the mixture used in the third layer. The eighth or sealing layer is a mixture of ethylene vinyl acetate and an ionomer. The ethylene vinyl acetate component the sealing layer of this first or shaped layer preferably makes about 50% by weight to about 99% by weight of the sealing layer. The reverse is the ionomer in one Range from preferably about 1% by weight to about 50% by weight of the total weight of the sealing layer available. In particular, the ethylene vinyl acetate component is the sealing layer the first or shaped layer in an amount of between about 90% and 95% by weight % By weight of the total weight of the sealant layer and vice versa is the ionomer in the range of preferably about 5% by weight to 10% by weight of the total weight of the sealing layer available. Surprisingly, a shaped layer with 95 wt.% EVA and 5 wt.% a zinc ionomer has a considerably stronger seal strength than samples with 90% by weight EVA and 10% by weight ionomer. The ionomer is preferably a zinc ionomer. A suitable example is Surlyn 1705 available from the DuPont Company.

The second, or substantially unformed, layer includes a first Layer of nylon and preferably nylon-6. In particular, a cast nylon used, one side of which is coated with saran. A suitable example is Capran 77K nylon available from Allied Corporation is. An example of the second or adhesive layer is Korolam Adhesive 880X301, which is available from DeSoto. The third layer is an ethylene vinyl acetate copolymer, preferably an EVA with a vinyl acetate content of about 3.5% by weight.

A suitable resin is the PE204-CS95 copolymer EVA resin available from from El Paso Products Co. is available. The fourth or sealing layer contains a Ionomer, and particularly a zinc ionomer which is not the same ionomer as that which is used in the sealing layer of the first or molded layer. A suitable ionomer is Surlyn 1702 available from DuPont Chemical. According to a more preferred embodiment according to the invention, the sealing layer comprises of the second, or substantially unformed, layer between about 2 wt.% and 4% by weight of an anti-block agent such as Conpol 8750 available from the DuPont Company is.

According to another embodiment of the invention, the second comprises or a substantially non-molded sheet, a first layer of polypropylene, such as that which is described above for the shaped layer, a second or Tie layer such as that described above for the molded sheet is, a third layer of ethylene vinyl acetate copolymer, which is preferably Has a vinyl acetate content of about 3.5% by weight, for example PE204-CS95 Copolymer EVA resin, a fourth or tie layer, preferably like the second Layer, a fifth layer of ethylene vinyl alcohol copolymer like the one which is described above for the first or shaped layer, the sixth or tie layer, preferably according to the second and fourth layers, one seventh layer of ethylene vinyl acetate copolymer, preferably similar to that in the third layer and an eighth or sealing layer made of an ionomer, in particular a zinc ionomer and typically Surlyn 1702.

The presence of between about 2% and 4% by weight of an antiblock agent concentrate in the ionomer layer according to an embodiment of the second or substantially unshaped layer ensures that there is no shrinkage and stickiness of the sealing layer substantially during extrusion and especially during bubble collapse be avoided. A second advantage of using small amounts of antiblocking agent in the ionomer layer is that the packaging flap 22 for the separable Sealing seam is easy to open.

The first or molded sheet of the present invention exhibits excellent Formability, shrinkage properties, optical properties and openability on. In addition, the formed sheet does not delaminate during opening.

The shaped sheet is also characterized in that it is after Thermoforming and shrinking of the packaging onto the goods only insignificant melt puckering shows.

The invention is explained in more detail below with the aid of examples.

Example 1 Example 1 is one of those preferred according to the invention Laminates shown for easy opening. The laminate used for the formed layer contained a first layer made of polypropylene (NPP 8080 from the Northern Petrochemical Company), a second layer of adhesive (CXA E152 from DuPont), a blend of 40% by weight linear low density polyethylene (Dowlex 2054); and 60% by weight of ethylene vinyl acetate copolymer (LD-318.92 EVA resin with 9% by weight of vinyl acetate content), a fourth or barrier layer made of ethylene vinyl alcohol copolymer (EVAL EC-F101), another layer of adhesive like the second layer, another layer of mixture like the third layer and a sealing layer which is a mixture of 90% by weight ethylene vinyl acetate copolymer (3130SB from DuPont with 9% by weight vinyl acetate content) and 1D% by weight ionomer (Surlyn 1705) contained.

The laminate was placed on a thermoforming machine and the molding temperature changed from 700C to 900C. The seal range was changed from 9 OOC to 1100C. An unshaped sheet that was used in conjunction with the shaped sheet, contained a first layer of cast nylon-6 with one side coated with saran was, a second layer of Korolam adhesive 880X30t, a third layer of Ethylene vinyl acetate copolymer with a vinyl acetate content of 3.5% by weight (PE204-CS95) and a sealing layer of 98% by weight ionomer (Surlyn t702) and about 2% by weight of one Antiblocking agent (Conpol 8750).

The molded sheet had a thickness of about 114.3 µm.

After thermoforming, the molded sheet had good optical properties with excellent clarity, and after molding and shrinking, there was no melt pucker recognizable. The layer to be formed was in a temperature range from about 75 ° C to 900C malleable with good pocket depth. This material also shows excellent shrinkage and a good easily separable heat seal seam within a Temperature range of about 5 0C. The molded sheet showed no delamination at all.

Sample packages formed from the above-described and unshaped sheet also showed adequate seal strengths and adequate inner ring self-welding. The sample packaging was packaging, which enclosed a smoked ring sausage product. The top (not molded) layer was only slightly wavy, so that the unshaped layer remained relatively flat.

Example 2 A similar combination of materials as shown in Example 1 shown was used. The materials were in every way the same with the exception that the sealing layer of the molded sheet is a mixture of Contained 95 weight percent ethylene vinyl acetate copolymer and 5 weight percent ionomer.

Sample packs showed excellent separability via one Range of sealing temperatures of approximately 5 ° C. Though the molded location a lower percentage of ionomer in the sealing layer than in example 1 had, surprisingly, noticeably stronger fusion-sealed seams than with the sample of Example 1 obtained.

When the package was opened, there was no delamination of the molded ones Situation observed.

Example 3 A laminate structure was examined which was as follows Formulation included: A first or outer layer comprising polypropylene (NPP 2085 GW) available from Northern Petrochemical Company contained a second layer of polypropylene homopolymer (NPP 2000 GJ), which is also from the Northern Petrochemical Company, a third or tie layer as in Examples 1 and 2, a fourth or barrier layer of ethylene vinyl alcohol copolymer as in examples 1 and 2, a fifth or tie layer as in the examples 1 and 2, a sixth layer of polypropylene (NPP 2000 GJ), a seventh or tie layer as in Examples 1 and 2 and an eighth or sealing layer as in the examples 1 and 2.

This laminate ensures excellent moisture vapor barrier properties, improved shrinkage properties, good mechanical strength and clarity.

It allows higher temperature ranges for processing the laminate during thermoforming and subsequent shrinkage stages. In a sealing test were on a strip of material 2.54 cm at 121.1 0C seal values of 1.60 kilopond, 1.36 kilopond and 1.36 kilopond on 3 trials using a Scott tester obtain.

Example 4 A laminate was tested which had a first or outer layer made of polypropylene homopolymer (NPP 2085 GW), a second layer made of ethylene propylene copolymer (NPP 3303 GK) available from Northern Petrochemical Company available is, a third or tie layer as in the previous examples fourth or barrier layer as in previous examples, a fifth or Link layer as in the previous examples, a sixth layer Ethylene propylene copolymer as in the second layer, a seventh tie layer and a sealing layer as in the previous examples for the molded sheet contained.

This laminate also showed improved moisture vapor barrier properties and shrinkage properties as well as improved mechanical strength, clarity and a higher temperature range for processing.

It is true that in the embodiments preferred according to the invention Mixture of EVA and ionomer in the sealing layer of the molded layer and an ionomer shown in the seal layer of the second or non-molded layer, but these compositions can be exchanged.

The shaped layer can thus be a sealing layer made of a monomer, preferably comprising a zinc ionomer of ethylene, and the unformed sheet may comprise a sealing layer with a mixture of EVA and an ionomer. In in this case the sealing layer, which contains the ionomer alone (not the mixture), very thin, preferably 5.08 µm to t2.70 µm thick, and has an adjacent layer, which contains an ethylene vinyl acetate copolymer, creating the "pull out" mechanism described above is guaranteed.

The packaging produced according to the invention is particularly suitable for Packaging of food such as ring sausages and smoked ring sausages is suitable.

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Claims (10)

Easily accessible for separable packaging and process for its manufacture claims 1. Easily separable packaging, characterized by a) a first layer comprising a sealant layer comprising a blend of ethylene vinyl acetate copolymer and an ionomer, and b) a second layer which comprises a sealing layer, which contains an ionomer, wherein c) the first and the second layer with the abutting Adhere surfaces to each other and enclose the goods. 2. Easily labeled on separable packaging for food by a) a multilayer first or molded layer which is a sealing layer comprising a mixture of an ethylene vinyl acetate copolymer and an ionomer contains, and b) a multilayer second layer which comprises a sealing layer of a Contains ionomer and an adjacent layer of ethylene vinyl acetate copolymer, wherein c) the first and second layers with their surfaces abutting one another adhere and d) the first and second layers together enclose a foodstuff. 3.Heat-sealed easy on separable packaging for food, characterized by a) a multi-layer first or shaped layer which has a Sealing layer made from a mixture of ethylene vinyl acetate copolymer and an ionomer and is adapted in shape to the food, b) a multilayer second layer, which has a sealing layer made of an ionomer and an adjacent one A layer of ethylene vinyl acetate copolymer is comprised and disposed on the food so that the first and second layers together enclose the food, c) the first and second layers being abutted by self-welding Surfaces are connected to each other, d) an easily separable hot melt seal seam near the edge of the packaging and e) Means for Opening the packaging are provided. 4. Packaging according to claim 1, characterized in that the first Layer a) a first layer of polypropylene, b) a second or tie layer, c) a third layer of a blend of linear low density polyethylene and ethylene vinyl acetate copolymer, d) a fourth or tie layer, e) one fifth or barrier layer of ethylene vinyl alcohol copolymer, f) a sixth or Tie layer, g) a seventh layer of a blend of linear polyethylene low density and ethylene vinyl acetate copolymer and h) an eighth or seal layer comprised of a mixture of ethylene vinyl acetate copolymer and a zinc ionomer. 5. Packaging according to claim 1, characterized in that the second Layer a) a first layer of nylon, b) a second layer of an adhesive, c) a third layer of ethylene vinyl acetate copolymer and d) a fourth or A zinc ionomer sealing layer comprises. 6. Packaging according to claim 1, characterized in that the second Layer a) a first layer of polypropylene, b) a second or tie layer, c) a third layer of ethylene vinyl acetate copolymer, d) a fourth or tie layer, i) a fifth layer of ethylene vinyl alcohol, f) a sixth or tie layer, g) a seventh layer of ethylene vinyl acetate copolymer; and h) an eighth or sealing layer comprised of a zinc ionomer. 7. Packaging according to claim 1, characterized in that the light Separability through the use of two incompatible sealing agents and through controlled delamination in the second or substantially unshaped Location is achieved. 8. Easily separable packaging according to claim 1, characterized in that that the first or shaped layer a) a first or outer layer of polypropylene, b) a second layer of polypropylene, c) a third or tie layer, d) a fourth, or barrier, layer of ethylene vinyl alcohol copolymer; e) a fifth or tie layer, f) a sixth layer of polypropylene, g) a seventh or tie layer, h) an eighth or sealing layer of a mixture of between about 50 and 99 percent by weight ethylene vinyl acetate copolymer and between about 50 and 1% by weight of an ionomer. 9. Easily separable packaging according to claim 1, characterized in that that the first or shaped layer a) a first or outer layer of polypropylene, b) a second layer of ethylene propylene copolymer, c) a third or tie layer, d) a fourth, or barrier, layer of ethylene vinyl alcohol copolymer; e) a fifth or tie layer, f) a sixth layer of ethylene propylene copolymer, g) a seventh or tie layer; and h) an eighth or sealing layer a blend of between about 50 and 99 percent by weight ethylene vinyl acetate copolymer and comprises between about 50 and 1 weight percent of an ionomer. 10. Process for the production of an easily separable packaging, characterized in that a) a first layer is formed which is a sealing layer comprises a mixture of ethylene vinyl acetate copolymer and an ionomer, b) a second layer forms which has a sealing layer of an ionomer and one thereon having an adjacent layer of ethylene vinyl acetate copolymer, c) the first layer thermoformed so that it is adapted to a food, d) the second layer arranges over the goods, e) heats the second layer, f) evacuates and then the first and second layers through on their abutting surfaces Self-welding joins together; and g) fusion-sealing the package.