JPH10138384A - Multi-layer composite film including easily peelable layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a great amount of information compacted by increasing rapidly the amount of write information of a postal card, documents for business, etc., by a method wherein only one interspace in three or more layers of transparent plastic films is made an easily peelable adhesion layer. SOLUTION: As a method wherein a multi-layer composite film including an easily peelable layer having easy peelability, in the case where two sheets of transparent plastic films, for example, transparent polyester films 1, 1 are stuck to each other, a sticking face of the transparent polyester film 1 on one side is treated by corona discharging in order to accelerate bond to a coated film polyethylene 2 to improve wettability of the sticking coated face, further treated by anchor coat of organic titanate or polyethylene imine or the like, and the other transparent polyester film 1 is extruded without any treatment to stick two layers of polyester films to each other by sandwich laminating by using polyethylene resin as an adhesion layer with a laminating device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multilayer composite film including an easily peelable layer.

[0002]

2. Description of the Related Art Conventionally, for example, in order to increase the amount of information of a postcard, a postcard having a size twice as large as a postcard connected on one side is half-folded at the connection side, and the side opposite to the connection side is placed on the side opposite to the connection side. Glued with glue, perforated to make it easier to open the part, or by multi-layer film so that letters on postcards are not visible from outside to convey personally confidential information There are confidential postcards, such as providing a blindfold seal and delivering it to the addressee, and then removing the blindfold seal so that the recipient can view the hidden confidential information.

[0003]

In such a conventional dual-purpose postcard, information cannot be included in a cut-out perforated portion, and in a postcard with a blindfold seal, emphasis is placed on confidentiality. And did not itself increase the amount of write information.

It is an object of the present invention to provide a conventional postcard, a postal letter, and other office documents by thermally bonding paper, a plastic sheet, or another sheet material on both sides of a multilayer composite film. It is an object of the present invention to provide a multilayer composite film including an easily peelable layer which can dramatically increase the amount of information to be written, and which can make a large amount of information compact.

[0005]

In order to achieve the above-mentioned object, only one of three or more transparent plastic films laminated on each other has an easily peelable adhesive layer, and A multilayer composite film including an easily peelable layer having a layer coated with a resin for bonding paper, a plastic sheet, or another sheet material or the like by hot pressing on both sides of the film was obtained. Further, the easily peelable adhesive layer is provided with an anchor coat for corona discharge treatment and adhesion promotion on the bonding surface of one of the two transparent plastic films, extruding the polyethylene coating film, and exposing the other transparent plastic film. Is extruded as untreated, so that one of the transparent plastic films has a strong adhesive force on the laminating surface, and the other transparent plastic film has a non-treated side with a degree of adhesion only due to the hot tack property of polyethylene. It is a multilayer composite film including an easily peelable layer.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As a method for obtaining a multilayer composite film including an easily peelable layer having easy peelability, there is the following method.
When two transparent plastic films, for example, transparent polyester films 1 and 1 are laminated and bonded, a corona discharge treatment is performed on the bonding surface of one of the transparent polyester films 1 in order to promote adhesion with the coating film polyethylene. To improve the wettability of the bonded coating surface, and further apply an anchor coat treatment such as an organic titanate-based <polyethyleneimine-based, etc .; Using a resin as an adhesive layer, two layers of a polyester film are laminated by sand lamination to form a three-layer film including a polyester film 1, a polyethylene coating film 2, and a polyester film 1, and both sides of the three-layer film are formed of one transparent polyester. Promotes adhesion to coated polyethylene as well as the bonding surface of film 1 Each of which is extruded and coated with a polyethylene resin by extrusion lamination to form a polyethylene coating film 5, a polyester film 1, a polyethylene coating film 2, a polyester film 1, and a polyethylene coating film 2. Almost thick anchor coat consisting of the following configuration, polyethylene coating each,
A five-layer composite film having a configuration of a polyethylene coating film 5, a polyester film 1, a polyethylene coating film 2, a polyester film 1, and a polyethylene coating film 5 and having an easily peelable layer on a polyester untreated surface having a thickness of about 160 μm. A, the five-layer composite film A is sandwiched between two sheets of paper, and hot-pressed, so that the polyethylene coating film 5 on the surface of the five-layer film adheres to each paper,
The five-layer composite film is integrated with the paper adhered to both sides. In this state, a non-adhesive portion is provided in an appropriate position, and the five-layer composite film is easily peeled from the non-processed bonding surface from the non-adhesive portion.

That is, the five-layer composite film according to the present invention is slightly smaller than the size of the postcard between each of two or three sheets of paper, such as paper, on which information is written. If the sheet is arranged between the sheet pieces 6 such as paper and the sheet piece 7 such as another paper, and heat-pressed from one side at a temperature of about 250 ° C. to 260 ° C., the size of a postcard is large. Thus, a postcard-sized composite sheet 10 in which two (or three) of the above are integrated is obtained.

The letter on which the information has been written can be easily peeled off from the detached portion of the non-adhesive portion, and the information written on the letter can be seen through the transparent polyester film 1.

As described above, since a multilayer composite film in which one layer is easily peelable is a polyethylene-coated film in which both surfaces are thermocompression-bonded, a number of sheets are alternately interposed between letters and the like to be integrated. Since the release layer can be peeled off after being handled as a sheet, it is possible to return to the original number after a plurality of sheets are overlaid. Such a large amount of information can be made compact and sent and transmitted, and at the same time it is not seen from outside except for the front and back of the letter. In addition, the sent letter is read through the surface on which the multilayer film has been peeled off on the recipient side, and each letter is reinforced with the multilayer film.

[0010] As a material of the transparent plastic film of the present invention, a resin film such as polyester, stretched polypropylene, polycarbonate and acrylic is used, and there is no particular reason why films of the same material must be selected and bonded. The laminating method of the film is extrusion laminating, using a polyethylene resin as an adhesive layer, film sanding, combining the same or different kinds of transparent plastic films, and three or more layers including the polyethylene resin layer. The film becomes the base film of the present invention. Further, it is effective to use an ionomer, a vinyl acetate-based polyethylene or the like, which melts at a low melting point so that it can be bonded to paper or the like by thermocompression bonding on both sides of the base film of the present invention.

Here, the operation of the present invention will be described. In the present invention, only one of three or more transparent plastic films laminated on each other has an easily peelable adhesive layer, and Because it is a multi-layer composite film including an easily peelable layer having a layer coated with a resin that bonds paper or a plastic sheet etc. under heat and pressure on both sides of the film, if various information is written and heat-treated, paper, multi-layer One composite multilayer sheet composed of a composite film and paper can be easily formed.

The composite multilayer sheet thus obtained can be arbitrarily peeled off by peeling off the adhesive surface so that the written information can be read clearly through the transparent film of the peeled composite multilayer film. At the same time, since the transparent film is adhered to the paper surface, there is an effect of reinforcing the paper. Furthermore, after sandwiching between sheets of paper to form a single composite multilayer sheet, and peeling off the adhesive surface of the multilayer film, information is written on a sheet of paper several times in place of the sheet of each sheet. After folding the paper surface, sandwiching the multilayer sheet of the present invention between the folded paper surfaces and integrating them, if the adhesive surface of the multilayer sheet is peeled off, information written in a continuous state can be obtained through the transparent plastic film. You can do it. As described above, the composite multilayer film of the present invention is formed into a single sheet of paper of any size and any number of pieces of information written on it, and sends the information sheet to any person. This is suitable for the information age in the sense that a large amount of information can be easily received by peeling off one sheet at the place where it was sent.

[0013]

Example 1 A 600 m / m width of a stretched polypropylene film having a thickness of 30 μm and a 600 m / m width of a polyester film having a thickness of 25 μm were subjected to film sanding using a polyethylene resin as an adhesive by an extrusion laminating machine.
A multilayer film composed of three layers of 30 μm stretched polypropylene, 15 μm polyethylene layer, and 25 μm polyester film was prepared. In forming the three-layer film, both surfaces of the polyester film are subjected to a corona discharge treatment, and further coated with a polyethyleneimine-based anchor agent, and coated with polyethylene immediately after being dried. It was laminated under pressure on a polyethylene coating film.

The three-layer film thus formed is composed of two
The 5μ polyester film and polyethylene coating film have strong adhesion between the layers and cannot be easily peeled off, but the 30μ stretched polypropylene film and polyethylene coating film have three easily peelable layers. When the unbonded portion 8 was pulled, it could be easily peeled off.

As described above, an ionomer resin is further applied to both sides of the formed multilayer film in a thickness of 30 μm each to obtain a 30 μm ionomer coating film, the three-layer film,
Five layers of 0μ ionomer coatings were formed.

The five-layer film thus formed is cut into pieces each having a length and width smaller by 5 mm than the size of the postcard, and the five-layer film cut as described above is sandwiched between the two postcards. Then, the whole was integrated. Two postcards could be peeled off from the unbonded portions of the two postcards, which were reduced by 55 mm in both length and width in the 5-layer film.
Of course, 5
The layer film exhibited a gloss as covered by the peeled film.

[0017]

EXAMPLE 2 A 600 m / m width of a stretched polypropylene film having a thickness of 30 μm and a 600 m / m width of a polyester film having a thickness of 25 μm were subjected to film sand processing using a polyethylene resin as an adhesive by an extrusion laminating machine.
A multilayer film composed of three layers of 30 μm stretched polypropylene, 15 μm polyethylene layer, and 25 μm polyester film was prepared. In the formation of the three-layer film, as in the case of Example 1, one of the polyethylene-coated side surfaces is treated so as to be firmly adhered, and the other polyethylene-coated side surface is left untreated and the polyethylene coated film is left untreated. Under pressure. The interlayer between the untreated surfaces could be formed as an easily peelable layer.

A 30μ stretched polypropylene film, a 15μ polyethylene coating film, and a 30μ
A 30 μm ionomer resin was applied to both surfaces of a three-layer film of a stretched polypropylene film in the same manner as in Example 1 to form a five-layer film. This five-layer film. In the same manner as in Example 1, the postcards were cut, sandwiched between two sheets, heated and pressed, bonded together so that they were integrated, and then peeled off from the unbonded portions of the respective postcards. As in the case of No. 1, the adhesion surface of the film of the postcard exhibited gloss as if covered by the film.

[0019]

In the multilayer composite film including the easily peelable layer according to the first aspect, only one of the three or more transparent plastic films in which the transparent plastic film is laminated has the easily peelable adhesion layer. Since it is a multi-layer composite film including an easily peelable layer having a layer coated with a resin that bonds paper, plastic sheet, or other sheet materials by hot pressing on both sides of the laminated film, use an extrusion laminator machine. In order to provide the easy-peeling layer, the special easy-peeling layer can be provided without performing special treatment, and a stable easy-peeling layer can be formed. In addition, the present invention not only makes letters and other information compact, but also can be used in applications where film processing such as cutting and cutting into various shapes is easy and partial peeling is performed by thermocompression bonding. There is an effect that the film can be provided as a film which is very easy to handle and has a high degree of utilization. In the multilayer composite film including the easy-peeling layer according to claim 2, the easy-peeling adhesion layer is formed by applying a corona discharge treatment and an anchor coat for promoting adhesion to the bonding surface of one of the two transparent polyester films. Since the other transparent polyester film is a multi-layer composite film extruded as untreated, paper, a plastic sheet, or other sheet materials are bonded to the upper and lower surfaces of the composite film by hot pressing.
If the sheet material is pulled in the peeling direction, the easily peelable adhesive layer is peeled off very easily, so that it can be effectively used for confidential information, documents and documents.

[Brief description of the drawings]

FIG. 1 is a partially omitted enlarged cross-sectional view of a three-layer film serving as a base material of the present invention.

FIG. 2 is a partially omitted enlarged sectional view of the multilayer composite film of the present invention.

FIG. 3 is a partially omitted enlarged cross-sectional view showing a state in which the multilayer composite film of the present invention is hot-pressed and bonded between papers.

FIG. 4 is a partially omitted enlarged sectional view showing a state in which an easily peelable layer of the multilayer composite film of the present invention is peeled off.

[Explanation of symbols]

 1. . . 1. transparent plastic film . . 2. Polyethylene coating film . . Release surface 4. . . Adhesive surface 5. . 5. Coating film of polyethylene resin . . 6. Sheet pieces of paper etc. . . 7. Sheet pieces of paper etc. . . Unbonded part 10. . . Composite sheet A. . . Multi-layer composite sheet

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[Procedure amendment]

[Submission date] January 7, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Multi-layer composite film including an easily peelable layer

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multilayer composite film including an easily peelable layer.

[0002]

2. Description of the Related Art Conventionally, for example, in order to increase the amount of information of a postcard, a postcard having a size twice as large as a postcard connected on one side is half-folded at the connection side, and the side opposite to the connection side is placed on the side opposite to the connection side. Glued with glue, perforated to make it easier to open the part, or by multi-layer film so that letters on postcards are not visible from outside to convey personally confidential information There are confidential postcards, such as providing a blindfold seal and delivering it to the addressee, and then removing the blindfold seal so that the recipient can view the hidden confidential information.

[0003]

[Problems that the Invention is to Solve like this, in the conventional duality postcard, portions containing the cut perforation with unable to incorporate information in the postcard subjected blindfolded seal, the emphasis on secrecy be those placed, did not cause increased itself write information amount.

It is an object of the present invention to provide a conventional postcard, a postal letter, and other office documents by thermally bonding paper, a plastic sheet, or another sheet material on both sides of a multilayer composite film. It is an object of the present invention to provide a multilayer composite film including an easily peelable layer which can dramatically increase the amount of information to be written and can reduce the amount of information to a large amount.

[0005]

Means for Solving the Problems In order to achieve the above-mentioned object, only one layer among three or more transparent plastic films has an easily peelable adhesive layer, and A multilayer composite film including an easily peelable layer having a layer coated with a resin for bonding paper, a plastic sheet, or another sheet material or the like by hot pressing on both sides of the laminated film. Further, the easily peelable adhesive layer is provided with an anchor coat for corona discharge treatment and adhesion promotion on the bonding surface of one of the two transparent plastic films, extruding the polyethylene coating film, and exposing the other transparent plastic film. Is extruded as untreated, so that one of the transparent plastic films has a strong adhesive force on the laminating surface, and the other transparent plastic film has a non-treated side with a degree of adhesion only due to the hot tack property of polyethylene. It is a multilayer composite film including an easily peelable layer.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As a method for obtaining a multilayer composite film including an easily peelable layer having easy peelability, there is the following method.
When two transparent plastic films, for example, transparent polyester films 1 and 1 are laminated and bonded, a corona discharge treatment is performed on the bonding surface of one of the transparent polyester films 1 in order to promote adhesion with the coating film polyethylene. To improve the wettability of the bonded coating surface, and further apply an anchor coat treatment such as an organic titanate-based or polyethylene imine-based system. The other transparent polyester film 1 is extruded without exposing the polyethylene resin with a laminating machine. As an adhesive layer, two layers of a polyester film are laminated by sand lamination to form a three-layer film composed of a polyester film 1, a polyethylene coating film 2, and a polyester film 1, and both sides of the three-layer film are one transparent polyester film 1 Promotes adhesion with coated polyethylene as well as Subjecting each of the process of, the extrusion respectively laminating machine, by coating a polyethylene resin, a polyethylene Nurikomaku 5, polyester film
1, a polyethylene coating film 2, and a polyester film
A five-layer composite film A having an easily peelable layer on a polyester untreated surface having a thickness of about 160 μm and comprising a polyethylene coating film 5 and the five-layer composite film A is formed of two sheets of paper. By sandwiching and hot pressing, 5
When the polyethylene coating film 5 on the surface of the layer film adheres to each paper, the film is integrated with both sides of the five-layer composite film in a state where the paper adheres. In this state, a non-adhesive portion is provided in an appropriate position, and the five-layer composite film is easily peeled from the non-processed bonding surface from the non-adhesive portion.

That is, the five-layer composite film according to the present invention is slightly smaller than the size of the postcard between each of two or three sheets of paper, such as paper, on which information is written. If it is arranged between a sheet piece 6 such as paper and a sheet piece 7 such as another paper, and heat-pressed from both sides at a temperature of about 250 ° C. to 260 ° C., the size of a postcard is large. A postcard-sized composite sheet (not shown) in which two (or three) sheets are integrated is obtained.

The letter on which the information has been written can be easily peeled off from the detached portion of the non-adhesive portion, and the information written on the letter can be seen through the transparent polyester film 1.

As described above, since a multilayer composite film in which one layer is easily peelable is a polyethylene-coated film in which both surfaces are thermocompression-bonded, a number of sheets are alternately interposed between letters and the like to be integrated. the <br/> after the handle takes as sheets by the so peelable release layer, after the superimposed multiple sheets can be returned to the original number. Such a large amount of information can be made compact and sent and transmitted, and at the same time it is not seen from outside except for the front and back of the letter.
In addition, the sent letter is read through the surface on which the multilayer film has been peeled off on the recipient side, and each letter is reinforced with the multilayer film.

[0010] As a material of the transparent plastic film of the present invention, a resin film such as polyester, stretched polypropylene, polycarbonate and acrylic is used, and there is no particular reason why a film of the same material must be selected and bonded. The laminating method of the film is extrusion laminating, using a polyethylene resin as an adhesive layer, film sanding, combining the same or different kinds of transparent plastic films, and combining three or more layers including the polyethylene resin layer. The film becomes the base film of the present invention. Furthermore, an ionomer that melts at a low melting point on both sides of the base film of the present invention so that it can be bonded to paper or the like by thermocompression bonding,
It is effective to use vinyl acetate polyethylene.

Here, the operation of the present invention will be described. In the present invention, only one of three or more transparent plastic films laminated on each other has an easily peelable adhesive layer, and Because it is a multi-layer composite film including an easily peelable layer having a layer coated with a resin that bonds paper or a plastic sheet etc. under heat and pressure on both sides of the film, if various information is written and heat-treated, paper, multi-layer One composite multilayer sheet composed of a composite film and paper can be easily formed.

The composite multilayer sheet thus obtained can be arbitrarily peeled off by peeling off the adhesive surface so that the written information can be read clearly through the transparent film of the peeled composite multilayer film. At the same time, since the transparent film is adhered to the paper surface, there is an effect of reinforcing the paper. Furthermore, after sandwiching between sheets of paper to form a single composite multilayer sheet, and peeling off the adhesive surface of the multilayer film, information is written on a sheet of paper several times in place of the sheet of each sheet. After folding the paper surface, sandwiching the multilayer sheet of the present invention between the folded paper surfaces and integrating them, if the adhesive surface of the multilayer sheet is peeled off, information written in a continuous state can be obtained through the transparent plastic film. You can do it. As described above, the composite multilayer film of the present invention is formed into a single sheet of paper of any size and any number of pieces of information written on it, and sends the information sheet to any person. This is suitable for the information age in the sense that a large amount of information can be easily received by peeling off one sheet at the place where it was sent.

[0013]

Example 1 A 600 m / m width of a stretched polypropylene film having a thickness of 30 μm and a 600 m / m width of a polyester film having a thickness of 25 μm were subjected to film sanding using a polyethylene resin as an adhesive by an extrusion laminating machine.
A multilayer film composed of three layers of 30 μm stretched polypropylene, 15 μm polyethylene layer, and 25 μm polyester film was prepared. In forming the three-layer film, both surfaces of the polyester film are subjected to a corona discharge treatment, and further coated with a polyethyleneimine-based anchor agent, and coated with polyethylene immediately after being dried. It was laminated under pressure on a polyethylene coating film.

The three-layer film thus formed is composed of two
The 5μ polyester film and polyethylene coating film have strong adhesion between the layers and cannot be easily peeled off, but the 30μ stretched polypropylene film and polyethylene coating film have three easily peelable layers. When the unbonded portion 8 was pulled, it could be easily peeled off.

As described above, an ionomer resin is further applied to both sides of the formed multilayer film in a thickness of 30 μm each to obtain a 30 μm ionomer coating film, the three-layer film,
Five layers of 0μ ionomer coatings were formed.

The five-layer film thus formed is cut into a size of 5 mm each in the length and width directions smaller than the size of a postcard, and the five-layer film cut as described above is sandwiched between two postcards. Then, the whole was integrated. Two postcards could be peeled off from the unbonded portions of the two postcards, each of which was smaller by 55 mm in length and width in the 5-layer film.
Of course, 5
The layer film exhibited a gloss as covered by the peeled film.

[0017]

EXAMPLE 2 A 600 m / m width of a stretched polypropylene film having a thickness of 30 μm and a 600 m / m width of a polyester film having a thickness of 25 μm were subjected to film sand processing using a polyethylene resin as an adhesive by an extrusion laminating machine.
A multilayer film composed of three layers of 30 μm stretched polypropylene, 15 μm polyethylene layer, and 25 μm polyester film was prepared. In the formation of the three-layer film, as in the case of Example 1, one of the polyethylene-coated side surfaces is treated so as to be firmly adhered, and the other polyethylene-coated side surface is left untreated and the polyethylene coated film is left untreated. Under pressure. The interlayer between the untreated surfaces could be formed as an easily peelable layer.

A 30μ stretched polypropylene film, a 15μ polyethylene coating film, and a 30μ
A 30 μm ionomer resin was applied to both surfaces of a three-layer film of a stretched polypropylene film in the same manner as in Example 1 to form a five-layer film. This five-layered film is cut and sandwiched between two postcards in the same manner as in Example 1, heated and pressed, and bonded so as to be integrated, and peeled off from the unbonded portions of each postcard. As a result, as in the case of Example 1, the adhesive surface of the postcard film exhibited luster as if covered by the film.

[0019]

In the multilayer composite film including the easily peelable layer according to the first aspect, only one of the three or more transparent plastic films in which the transparent plastic film is laminated has the easily peelable adhesion layer. Since it is a multi-layer composite film including an easily peelable layer having a layer coated with a resin that bonds paper, plastic sheet, or other sheet materials by hot pressing on both sides of the laminated film, use an extrusion laminator machine. In order to provide the easy-peeling layer, the special easy-peeling layer can be provided without performing special treatment, and a stable easy-peeling layer can be formed. In addition, the present invention not only makes letters and other information compact, but also can be used in applications where film processing such as cutting and cutting into various shapes is easy and partial peeling is performed by thermocompression bonding. There is an effect that the film can be provided as a film which is very easy to handle and has a high degree of utilization. In the multilayer composite film including the easy-peeling layer according to claim 2, the easy-peeling adhesion layer is formed by applying a corona discharge treatment and an anchor coat for promoting adhesion to the bonding surface of one of the two transparent polyester films. Since the other transparent polyester film is a multi-layer composite film extruded as untreated, paper, a plastic sheet, or other sheet materials are bonded to the upper and lower surfaces of the composite film by hot pressing.
If the sheet material is pulled in the peeling direction, the easily peelable adhesive layer is peeled off very easily, so that it can be effectively used for confidential information, documents and documents.

[Brief description of the drawings]

FIG. 1 is a partially omitted enlarged cross-sectional view of a three-layer film serving as a base material of the present invention.

FIG. 2 is a partially omitted enlarged sectional view of the multilayer composite film of the present invention.

FIG. 3 is a partially omitted enlarged cross-sectional view showing a state in which the multilayer composite film of the present invention is hot-pressed and bonded between papers.

FIG. 4 is a partially omitted enlarged sectional view showing a state in which an easily peelable layer of the multilayer composite film of the present invention is peeled off.

[Explanation of Codes] . . 1. transparent plastic film . . 2. Polyethylene coating film . . Release surface 4. . . Adhesive surface 5. . 5. Coating film of polyethylene resin . . 6. Sheet pieces of paper etc. . . 7. Sheet pieces of paper etc. . . Unbonded part A. . . Multi-layer composite sheet

Claims (2)

[Claims] 1. One of three or more transparent plastic films laminated on each other has an easily peelable adhesive layer, and a paper, plastic sheet, or other material is provided on both sides of the laminated film. A multilayer composite film comprising an easily peelable layer having a layer coated with a resin for bonding a sheet material or the like by hot pressing. 2. The easily peelable adhesive layer is provided with an anchor coat for corona discharge treatment and adhesion promotion of one of the two transparent polyester films, and the other transparent polyester film is left untreated. The multilayer composite film including an easily peelable layer according to claim 1, which is extruded.