CN111846601A

CN111846601A - Food package with heating and automatic exhausting function and film thereof

Info

Publication number: CN111846601A
Application number: CN201910365097.9A
Authority: CN
Inventors: 訾国祥
Original assignee: Kung Long Hong Co ltd
Current assignee: Kung Long Hong Co ltd
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-10-30

Abstract

The invention provides a food package with heating and automatic exhaust and a film thereof, which can solve the problem that the existing package is sticky again after being heated by microwave.

Description

Food package with heating and automatic exhausting function and film thereof

Technical Field

The present invention relates to food package, and is especially one kind of food package capable of exhausting air automatically during heating and its used film.

Background

Generally, airtight plastic films are mostly adopted as sealing food packaging materials, and in the heating process, particularly microwave heating, steam is rapidly increased after food in the package is heated, so that the package forms internal pressure, the packaging material cannot support the pressure to cause explosion, and the food is not only dangerous, but also scattered and cannot be used, thereby causing the problem of cleanness. Therefore, before the packaged food is heated by microwave, the film is removed or the packaging film is cut by a blade, so that the trouble of microwave heating the food, the operation trouble and the explosion problem caused by forgetting to remove the film can be avoided.

Taiwan patent application nos. M505475 and M495350 (U.S. corresponding application No. 14,576,187) disclose a package capable of automatically regulating pressure after heating food and a composite film thereof, wherein the composite film comprises a first film layer, a second film layer and an adhesive layer, wherein a partial release layer is coated in a predetermined width of the first film layer, a hole (or a cutting line) is formed in a position of the second film layer corresponding to the partial release layer, the adhesive layer is interposed between the first film layer and the second film layer, the first film layer and the second film layer are adhered together by adhesive, the first film layer and the second film layer form a pseudo-adhesive at the position of the partial release layer, the second film layer is adhered to an opening of the package adjacently, the partial release layer of the second film layer extends to a position of a chamber in the package at a position of a heat seal, when the package is heated by microwave, pressure is generated, and enters a pseudo-adhesive region between the second film layer and the first film layer from the hole (or the cutting line) to form a gap, the pressure is released from the void to prevent bursting of the package. Both of these two patents and the microwave heating food package made of general multilayer film (for example, taiwan patent TWI 260270) have the following problems:

1. The common composite film food packing material is one composite structure comprising several layers of film, and has holes, gluing, parting agent, etc. and thus has complicated production process, high cost and slow production speed. 2. Since the multi-layer composite film is required to have holes in the multi-layer film in order to form the exhaust passage, there is a problem that the punched scraps (foreign matters) are mixed into the food package, which affects the food hygiene and safety. 3. The multilayer composite film is influenced by the film layers and the structural characteristics, the problem of unsmooth or incapable exhaust caused by adhesion between the film layers is often caused, and the qualification rate of the exhaust is only between 70 and 80 percent. 4. In addition, the surface of the composite film of the package has holes for venting air, which may damage or affect the appearance of the package.

Taiwan new type M430448 in taiwan is a packaging device disclosed by the applicant, wherein a pseudo-connecting region composed of release agent, hot melt adhesive, wax or low temperature resin is disposed at the heat sealing position of the box body or the film bag, the low-adhesion medium is used as pseudo-adhesion, the medium is melted during the heating process, and when the medium is melted, the adhesive force and the adhesion force of the medium are reduced, so that the pressure in the box body or the film bag can open the pseudo-connecting region, the hot air is dissipated outwards, the burst phenomenon is avoided, and when the temperature is reduced, the medium can be adhered again, the opened gap can be restored to a closed state, and the food leakage and the entry of external foreign matters can be prevented.

The applicant has found, after tests and practices, that these media have a viscosity that, after microwave heating, could cause the re-adhesion of the false connection area, causing the vapors of high pressure and high heat to be discharged from the false connection area unsuccessfully, some from the general packaging, some to burst directly, with poor results and very low yield.

Disclosure of Invention

The present invention has been made in view of the above problems, and it is therefore desirable to improve the packaging of microwave heated food products.

In order to achieve the purpose, the invention adopts the technical scheme that:

a food package with heated self-venting, comprising:

the box body is provided with an inner chamber for containing food and an opening for leading the inner chamber to the outside of the box body, the box body is provided with a top ring edge at the opening position, the top ring edge is preset with a box body hot melting area, and one part of the box body hot melting area is preset with a box body viscosity reducing area;

the film at least comprises a heat-sealing material layer and an outer layer, the film is covered on the top ring edge of the box body, a film hot-melting area is preset at the position of the film corresponding to the box body hot-melting area, and a film anti-adhesion area is preset at the position of the film corresponding to the box body anti-adhesion area;

The anti-reverse-viscosity hot melt adhesive layer is arranged between the top ring edge of the box body and the film and positioned at the position of the box body viscosity reducing area and the film viscosity reducing area;

this film and this box body adopt the material that can weld each other, this film combines through the hot melt with this box body top ring reason, this box body hot melt district bonds fixedly together with film hot melt district, this box body visbreaking district bonds fixedly together through anti viscidity hot melt adhesive layer with film viscidity district, produce high fever and interior pressure after this food package heating, high fever makes this anti viscidity hot melt adhesive layer soften and lose viscidity, interior pressure makes this box body viscidity district and this film viscidity district separation, pressure can discharge smoothly.

The food package with the heating automatic exhaust function is characterized in that the box body is made of PP or PP-containing materials, the material of a heat sealing material layer of the film is LLDPE, the material of an outer layer of the heat sealing material layer is PET, and the material of the anti-reverse-adhesion heat sealing glue layer is a thermal paint type heat sealing agent with TOYO-MORTON and LTD model AD-1790-15.

The food package with the heating automatic exhaust function is characterized in that the box body is made of PE or PE-containing materials, the material of the heat-sealing material layer of the film is CPP, the material of the outer layer of the heat-sealing material layer is PET, and the material of the anti-reverse-adhesion hot melt adhesive layer is TOYO-MOTON, LTD type AD-1790-15 hot paint type heat sealing agent.

The food package with the heating automatic exhaust function is characterized in that the transverse length of the anti-falling-adhesion hot melt adhesive layer is 6-15 mm, and the thickness of the anti-falling-adhesion hot melt adhesive layer is 0.35-0.65 mm.

The food package with the heating automatic exhaust function is characterized in that the material of the anti-reverse-adhesion hot melt adhesive layer is EVA resin for coating.

A food package with heated self-venting, comprising:

a film bag, the film bag includes an upper film and a lower film, the upper film and the lower film have a heat sealing material layer and an outer layer, the film bag has an inner chamber for containing food, one side of the upper film and the lower film has a seal, the upper film surface of the seal is preset with an upper film hot melting area, one part of the upper film hot melting area is preset with an upper film viscosity reducing area, the lower film surface is preset with a lower film hot melting area, one part of the lower film hot melting area is preset with a lower film viscosity reducing area, the upper film hot melting area and the lower film hot melting area are at corresponding positions, the upper film viscosity reducing area and the lower film viscosity reducing area are at corresponding positions;

the anti-reverse-adhesion hot melt adhesive layer is arranged between the upper film and the lower film and is positioned at the position of the upper film viscosity reducing area and the lower film viscosity reducing area; the seal of the film bag is combined by hot melting, the upper film hot melting area and the lower film hot melting area are bonded together, the upper film viscosity-reducing area and the lower film viscosity-reducing area are bonded together through an anti-falling viscosity hot melting adhesive layer, high heat and internal pressure are generated after the food package is heated, the anti-falling viscosity hot melting adhesive layer is softened by the high heat and loses viscosity, the upper film viscosity-reducing area is separated from the lower film viscosity-reducing area by the internal pressure, and the pressure is smoothly discharged.

The food package with the heating automatic exhaust function is characterized in that the material of the heat-sealing material layers of the upper film and the lower film is LLDPE or CPP, the material of the outer layer is nylon or PET, and the material of the anti-reverse-adhesion heat-melting glue layer is TOYO-MORTON, LTD model AD-1790-15 heat-sealing agent.

The food package with the heating automatic exhaust function is characterized in that a middle layer made of nylon material is arranged between the heat-sealing material layer and the outer layer.

The food package with the heating automatic exhaust function is characterized in that the material of the heat sealing material layers of the upper film and the lower film is CPP, the material of the outer layer is OPP, and the material of the anti-falling-viscosity hot melt adhesive layer is TOYO-MORTON, LTD type AD-1790-15 hot paint type heat sealing agent.

A film for food packaging having a function of heating and automatically exhausting air, characterized in that: the film is used for being thermally sealed on a food package, the film comprises a heat-sealing material layer and an outer layer, a film hot melting area is preset on the film, a film viscosity reducing area is preset on the film hot melting area, and an anti-falling-viscosity hot melt adhesive layer is covered on the film viscosity reducing area.

The film with the function of heating and automatically exhausting for food packaging comprises a heat-sealing material layer made of LLDPE or CPP, an outer layer made of nylon or PET, and an anti-reverse-adhesion hot-melt adhesive layer made of TOYO-MORTON and LTD type AD-1790-15 hot-paint type heat-sealing agent.

The food packaging film with the function of heating and automatic exhaust is characterized in that a middle layer made of nylon material is arranged between the heat-sealing material layer and the outer layer.

The film with the function of heating and automatically exhausting for packaging the food is characterized in that the material of the heat-sealing material layer is CPP, the material of the outer layer is OPP, and the material of the anti-falling viscidity hot melt adhesive layer is TOYO-MORTON, LTD model AD-1790-15 hot paint type heat sealing agent.

The food packaging film with the function of heating and automatic exhaust is characterized in that the material of the anti-reverse-adhesion hot melt adhesive layer is EVA resin for coating.

The food package with the heating automatic exhaust function provided by the invention has the advantages that the punching is not needed, so that a plurality of manufacturing processes can be reduced, the mass production speed is high, the appearance of the package is not influenced due to the punching is not needed, and the problem that punched scraps or foreign matters are mixed into the food package due to the punching can be avoided. After testing, the invention utilizes the technical scheme that the anti-falling-viscosity hot melt adhesive layer is arranged at the sealing position, the qualification rate of exhaust is high, and the effect is very obvious.

Drawings

Fig. 1 is an exploded view of a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a thin film according to a first embodiment of the present invention.

Fig. 3 is a combined perspective view of the invention of fig. 1 after packaging.

Fig. 4 shows a cross-sectional view taken along line 4-4 of fig. 3.

FIG. 5 is a schematic view of the invention of FIG. 4 after heating.

Fig. 6 is a largely exploded view of a second embodiment of the invention.

FIG. 7 is a schematic external view of the package of FIG. 6 according to the present invention.

Fig. 8 is a cross-sectional view taken along line 8-8 of fig. 7 in accordance with the present invention. Showing an unheated state.

FIG. 9 is another state diagram of FIG. 8 according to the present invention. The heated state is displayed.

FIG. 10 is a cross-sectional view of an upper film and a lower film according to a second embodiment of the present invention.

FIG. 11 is a cross-sectional view of an upper film and a lower film according to another embodiment of the present invention.

Description of reference numerals: food package with heated self-

venting

100, 500; the case 10 is a film 20; the anti-tack hot melt adhesive layer 30 food 40; bottom 11, edge 12; the inner chamber 13 has an opening 14; top rim 15 box hot melt zone 16; a box body viscosity reducing region 17 and a film hot melting region 21; the film detackifying region 22 heat-sealing the material layer 25; the outer layer 26 is a film bag 50; a film 51 on the anti-tack hot melt adhesive layer 60; lower film 52 contains chamber 53; a seal 54; an opening 31; an upper film hot melt area 511 and an upper film de-bonding area 512; lower film hot melt zone 521 lower film detackifying zone 522; an outer layer 57 of heat seal material 56; the middle layer 58 is open 61.

Detailed Description

To further clarify the features and advantages of the present invention, a more particular description of the invention will be rendered by reference to the following detailed description when considered in conjunction with the appended drawings in which:

referring to fig. 1-5, a food package 100 with heating and automatic venting function according to a first preferred embodiment of the present invention comprises a case 10, a film 20 and an anti-adhesive hot-melt adhesive layer 30. The food package 100 of the present invention is intended to contain a liquid or solid or liquid refrigerated or frozen food 40 and may be microwaveable.

In one embodiment, the case 10 has a bottom 11 and a rim 12 extending upward from the periphery of the bottom 11 to form an inner chamber 13 for containing food, the inner chamber 13 has an opening 14 for the inner chamber 13 to pass through the outside of the case 10, the rim 12 of the opening 14 has a top rim 15, a case melt zone 16 is preset on the top rim 15 at a position to be combined with a film 20, the case melt zone 16 is preset on the entire top rim 15, and a case viscosity reducing zone 17 is preset on a portion of the case melt zone 16, in one embodiment, the length of the case viscosity reducing zone 17 is about 6mm to 15mm, but the scope of the present application is not limited thereby.

In one embodiment, the film 20 is provided to cover the top rim 15 of the box 10 to close the opening 14 of the box 10, the film 20 is pre-positioned with a film hot-melt zone 21 at a position corresponding to the box hot-melt zone 16, that is, the film hot-melt zone 21 is positioned at the peripheral edge or the near edge of the film 20, and the pre-positioned position is shown by a dotted line in fig. 1, which does not indicate that the dotted line exists. The film 20 is provided with a film tack-reducing zone 22 at a position corresponding to the box tack-reducing zone 17, the position of the film tack-reducing zone 22 being indicated by a broken line, which does not indicate the presence of the broken line. In addition, the film detackifying region 22 has the same length as the cartridge detackifying region 17. In the embodiment, the film 20 is made of a material that can be welded to the case 10, and basically, the film 20 and the case 10 are made of different materials, so that the film 20 can be torn from the case 10 only when the film 20 is torn from the case. While the film 20 mainly comprises a heat-seal material layer 25 as shown in fig. 2, a multi-layer film may be used, that is, an outer layer 26 with other functionality or other purposes is attached to the back of the heat-seal material layer 25, for example, as a film layer for increasing strength or/and printing purposes, and therefore, the outer layer may be two or more than three layers.

In one embodiment, the anti-tack layer 30 is disposed between the top rim 15 of the case 10 and the film 20 at the case tack-reducing zone 17 and the film tack-reducing zone 22.

In one embodiment, the anti-tack hot melt adhesive layer 30 is made of a thermal lacquer Type Heat sealing agent (HotLacquer Type Heat Sealant) of TOYO-MORTON, LTD model AD-1790-15, and in another embodiment, the Heat sealing agent is made of a coating Ethylene Vinyl Acetate (EVA) EVA resin in a liquid state, and the coating is applied to the film adhesion reducing region 22 by printing technology to form a thin layer with a thickness of 0.35mm to 0.65mm, preferably 0.45mm to 0.55mm and a length approximately equal to the length of the film adhesion reducing region 22, and the anti-tack hot melt adhesive layer 30 reduces the adhesive strength at the Heat sealing position after Heat sealing the case 10 and the film 20, and the Heat sealing position is not adhered again after being opened.

Table one shows a material comparison table for an embodiment of the food package 100 with heated self-venting of the present invention.

Watch 1

The material of the box 10 in this embodiment also includes a small amount of Polyethylene (PE) or other material added to Polypropylene (PP) material, which accounts for about 7% -8%, and a small amount of PP or other material added to PE material, which accounts for about 7% -8%. In addition, if the case 10 is a PP material, the heat-seal material layer 25 of the film 20 is LLDPE, the outer layer 26 is polyethylene terephthalate (PET), and if the case 10 is a PE material, the heat-seal material layer 25 of the film 20 is Cast Polypropylene (CPP), and the outer layer 26 is PET, which can increase the strength of the film 20 and facilitate printing.

Please refer to fig. 3 and 4, which are schematic diagrams illustrating the first embodiment being heat sealed by a conventional heat sealing machine, such as an ultrasonic heat sealing machine, and the portions are the same as the conventional packaging technology and will not be described herein again. And also shown in figure 4 is food 40 contained in the interior compartment 13.

Fig. 5 is a schematic view of the food package shown in fig. 3 and 4 after microwave heating, in which moisture in the food 40 is heated and evaporated (as shown by arrows), so that the content chamber 13 generates high heat and high pressure, the high heat and high pressure soften the anti-reverse-adhesion hot-melt adhesive layer 30, and the anti-reverse-adhesion hot-melt adhesive layer 30 has no adhesion after softening, so that the anti-reverse-adhesion area 17 will not be adhered back, and the film anti-adhesion area 22 and the box anti-adhesion area 17 are opened by internal pressure to form an opening 31, and the pressure in the content chamber 13 can be smoothly discharged from the opening 31, and the exhaust qualification rate is almost 100% after a plurality of tests for a long time.

Referring to fig. 6-11, a second preferred embodiment of a heated self-venting food package 500 for containing liquid, solid or liquid refrigerated or frozen food products and facilitating microwave heating is shown. It comprises a film bag 50 and an anti-fall-off hot-melt adhesive layer 60.

In one embodiment, the film bag 50 is made of films, which includes an upper film 51 and a lower film 52, the circumference of the film bag 50 is closed, and the film bag has an inner chamber 53, wherein one side of the upper film 51 and the lower film 52 has a seal 54, an upper film hot-melting region 511 is preset on the surface of the upper film 51 at the seal 54, an upper film adhesion-reducing region 512 is preset on a part of the upper film hot-melting region 511, a lower film hot-melting region 521 is preset on the surface of the lower film 52, and a lower film adhesion-reducing region 522 is preset on a part of the lower film hot-melting region 521, wherein the upper film hot-melting region 511 and the lower film hot-melting region 521 are in corresponding positions, and the upper film adhesion-reducing region 512 and the lower film adhesion-reducing region 522 are in corresponding positions; in addition, the upper film tack-reducing zone 512 and the lower film tack-reducing zone 522 have a transverse opening length of about 6mm to about 15mm and are shown in phantom, but this is not intended to be present and is not intended to be required, and may be located anywhere else in the upper film hot-melt zone 511 and the lower film hot-melt zone 521. In one embodiment, the upper film 51 and the lower film 52 are made of heat-sealable materials, preferably the same material, so that the film bag 50 has sufficient strength to contain the food 40, the upper film 51 and the lower film 52 each mainly comprise a heat-sealable material layer 56 and an outer layer 57 (see fig. 10), and a middle layer 58 (see fig. 11) may be interposed between the heat-sealable material layer 56 and the outer layer 57; in addition, the upper film 51 and the lower film 52 may be the same film or separate films to form the film bag 50.

In one embodiment, the anti-tack hot melt adhesive layer 60 is interposed between the upper film 51 and the lower film 52 at the location of the upper film detackifying region 512 and the lower film detackifying region 522, the anti-tack Hot melt adhesive layer 60 is made of a Hot Lacquer Type Heat sealer (Hot Lacquer Type Heat Sealant) of TOYO-MORTON, LTD Type AD-1790-15, another example is selected from Ethylene Vinyl Acetate (EVA) EVA resin for coating, which is coated on the upper film anti-tack region 512 or the lower film anti-tack region 522 by using a printing technique, to form a thin layer having a thickness of 0.35mm to 0.65mm, preferably 0.45mm to 0.55mm, the length of the anti-reverse-adhesion hot-melt adhesive layer 60 is consistent with the length of the upper film adhesion-reducing region 512 and the lower film adhesion-reducing region 522, the adhesive strength of the heat-sealing position can be reduced after the anti-reverse-adhesion hot-melt adhesive layer 60 is heat-sealed on the upper film 51 and the lower film 52, and the heat-sealing position cannot be adhered back after being opened.

Table two shows a material comparison table for an embodiment of the food package 500 having a heated self-venting feature of the present invention.

Table two:

in Table two, the heat-seal material layer 56 of one embodiment is a linear low density Polyethylene LLDPE or a Cast Polypropylene (CPP) material, and the outer layer is nylon NY or Polyethylene Terephthalate (PET), and in Table two, the heat-seal material layer 56 and the outer layer 57 have a middle layer 58 therebetween, and the middle layer 58 is Nylon (NY). While Table II No. 7 shows an example where the heat-sealable material layer 56 is a CPP material, the outer layer 57 is an Oriented Polypropylene (OPP) material. Nylon (NY), PET, and OPP materials can increase the strength of the upper film 51 and the lower film 52, and are easily printed.

Please refer to fig. 7 and 8, which are schematic diagrams illustrating a second embodiment of the present invention being heat sealed by a heat sealing machine, such as an ultrasonic heat sealing machine, and these parts are the same as the conventional packaging technology, and thus are not described herein again. And the figure also shows the food 40 contained in the interior compartment 53. When the food package 500 of fig. 8 is heated by microwave, moisture in the food 40 in the inner chamber 53 is evaporated (see arrows in fig. 9), so that high heat and internal pressure are generated in the inner chamber 53, the high heat softens the anti-tack hot melt adhesive layer 60, and the anti-tack hot melt adhesive layer 60 is not sticky after being softened. The internal pressure causes the upper film viscosity-reducing area 512 and the lower film viscosity-reducing area 522 to be opened and separated to form an opening 61, the anti-fall-off hot-melt adhesive layer 60 cannot be adhered to the opening 61, the pressure in the inner chamber 53 can be smoothly discharged from the opening 61, the problem of unsmooth or impossible air discharge in the background art can be solved, and the air discharge qualification rate can almost reach 100% after long-time testing.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A food package with heated self-venting, comprising:

2. The heated self-venting food package of claim 1, wherein the container body is selected from the group consisting of PP and PP-containing materials, the heat sealable material layer of the film is LLDPE, the outer layer is PET, and the anti-tack hot melt adhesive layer is made of a thermal lacquer type heat sealer, TOYO-moton, LTD model AD-1790-15.

3. The package for food products with heated self-venting as claimed in claim 1, wherein the container body is selected from PE or PE-containing materials, the material of the heat-seal material layer of the film is CPP, the material of the outer layer is PET, and the material of the anti-tack hot melt adhesive layer is a thermal lacquer type heat-seal of the TOYO-moton, LTD model AD-1790-15.

4. The food package with heating automatic air discharging function according to claim 1, wherein the anti-fall-off hot melt adhesive layer has a transverse length of 6mm to 15mm and a thickness of 0.35mm to 0.65 mm.

5. The food package with heating automatic exhaust according to claim 1, wherein the material of the anti-tack hot melt adhesive layer is coating EVA resin.

6. A food package with heated self-venting, comprising:

7. The food package with heating automatic ventilation as claimed in claim 6, wherein the material of the heat-seal material layer of the upper film and the lower film is LLDPE or CPP, the material of the outer layer is nylon or PET, and the material of the anti-reverse-tack hot-melt adhesive layer is TOYO-MORTON, LTD model AD-1790-15 hot-lacquer type heat-seal agent.

8. The package for food products with heated self-venting as claimed in claim 7, wherein a middle layer of nylon material is provided between the heat-sealable material layer and the outer layer.

9. The food package with heated self-venting function as claimed in claim 6, wherein the material of the heat-seal material layers of the upper and lower films is CPP, the material of the outer layer is OPP, and the material of the anti-tack hot melt adhesive layer is TOYO-MORTON, LTD model AD-1790-15 hot lacquer type heat-seal agent.

10. The food package with heating automatic exhaust according to claim 6, wherein the material of the anti-tack hot melt adhesive layer is coating EVA resin.

11. The food package with heating automatic air discharging function according to claim 6, wherein the anti-fall-off hot melt adhesive layer has a transverse length of 6mm to 15mm and a thickness of 0.35mm to 0.65 mm.

12. A film for food packaging having a function of heating and automatically exhausting air, characterized in that: the film is used for being thermally sealed on a food package, the film comprises a heat-sealing material layer and an outer layer, a film hot melting area is preset on the film, a film viscosity reducing area is preset on the film hot melting area, and an anti-falling-viscosity hot melt adhesive layer is covered on the film viscosity reducing area.

13. The film for food packaging with heated self-venting according to claim 12, wherein the material of the heat-seal material layer is LLDPE or CPP, the material of the outer layer is nylon or PET, and the material of the anti-tack hot-melt adhesive layer is a TOYO-moton, LTD type AD-1790-15 hot lacquer type heat-seal.

14. The film for food packaging with heating automatic ventilation as claimed in claim 13, wherein a middle layer made of nylon material is provided between the heat-seal material layer and the outer layer.

15. The film for food packaging with heated self-venting according to claim 12, wherein the material of the heat-seal material layer is CPP, the material of the outer layer is OPP, and the material of the anti-tack hot melt adhesive layer is a thermal lacquer type heat-seal of TOYO-moton, LTD model AD-1790-15.

16. The film for food packaging with heating automatic ventilation according to claim 12, wherein the material of the anti-tack hot melt adhesive layer is EVA resin for coating.