CN212124443U - Composite film for packaging vacuum heat insulation plate - Google Patents
Composite film for packaging vacuum heat insulation plate Download PDFInfo
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- CN212124443U CN212124443U CN202020538823.0U CN202020538823U CN212124443U CN 212124443 U CN212124443 U CN 212124443U CN 202020538823 U CN202020538823 U CN 202020538823U CN 212124443 U CN212124443 U CN 212124443U
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Abstract
The utility model provides a composite film for packaging a vacuum heat insulation plate, which comprises a barrier coating, a polyamide co-extrusion layer, a bonding layer and a heat sealing layer from outside to inside in sequence; the polyamide co-extrusion layer comprises at least one EVOH middle layer; the polyamide co-extrusion layer is provided with reinforced structures at two sides of the EVOH intermediate layer. According to the composite film for packaging the vacuum insulation board, the polyamide co-extrusion layer is the core layer, the EVOH layer is arranged in the middle of the core layer, so that the film has barrier property, and the reinforcing structures are arranged on two sides of the EVOH layer, so that excellent mechanical property and puncture resistance can be provided for the film; the polyamide co-extrusion layer is coated with the barrier coating, the barrier coating has extremely low water vapor transmission rate and oxygen transmission rate, the influence of moisture on the barrier property of the EVOH can be prevented, and the composite film for packaging the vacuum insulation board is ensured to have excellent barrier property. The composite film is particularly suitable for packaging vacuum insulation panels.
Description
Technical Field
The utility model relates to a film package material technical field, in particular to vacuum insulation board is composite film for packing.
Background
The Vacuum Insulation Panel (VIP) is a heat Insulation material, which is compounded by filling heat Insulation core material, getter and Vacuum protection surface layer, and it adopts the Vacuum pumping method to remove the gas remained in the heat Insulation space, effectively avoids the heat transfer caused by air convection, and greatly reduces the heat conductivity coefficient. Therefore, the performance and the service life of the vacuum insulation panel are greatly determined by the permeation resistance of the surface diaphragm material to gas in the using process of the vacuum insulation panel, the lower the vacuum degree in the vacuum insulation panel is, the better the heat insulation performance is, the smaller the heat conductivity coefficient change is, the better the heat insulation performance of the vacuum insulation panel is, and the longer the service life is.
At present, most of VIP packaging bags adopt aluminum-plastic composite flexible packaging films, such as a packaging film of an aluminum-plastic vacuum insulation panel disclosed in patent publication No. CN201721767U, and the packaging film adopts a PA/PET/AL/PA/PE composite film with a structure, so that the packaging film has excellent barrier property, but the heat conductivity coefficient of a metal aluminum foil is 273W/m.K, which is far greater than that of a plastic packaging film (less than or equal to 2W/m.K). The high thermal conductivity coefficient can reduce the heat insulation performance and the service life of the vacuum heat insulation plate, however, the service life of the vacuum heat insulation plate is generally 15-20 years, and therefore, a packaging film with low thermal conductivity coefficient and ultrahigh barrier property still needs to be developed to prolong the service life of the vacuum heat insulation plate.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the background technology, the utility model provides a composite film for packaging a vacuum insulation board, which comprises a barrier coating, a polyamide co-extrusion layer, a bonding layer and a heat sealing layer from outside to inside in sequence;
the polyamide co-extrusion layer comprises at least one EVOH middle layer; and reinforcing structures are arranged on the two sides of the EVOH intermediate layer of the polyamide co-extrusion layer.
Furthermore, the polyamide co-extrusion layer is a five-layer co-extrusion biaxially oriented film, and the film layer structure of the polyamide co-extrusion biaxially oriented film sequentially comprises a polyamide first surface layer, a polyamide first reinforcing layer, an EVOH layer, a polyamide second reinforcing layer and a polyamide second surface layer from outside to inside.
Further, the thickness of the barrier coating is 1-3 μm.
Further, the thickness of the polyamide co-extrusion layer is 15-30 μm; the thickness of the first polyamide surface layer and the thickness of the second polyamide surface layer are both 1-2 mu m; the thickness of the EVOH layer is 2-5 mu m.
Further, the thickness of the adhesive layer is 1-2 μm.
Further, the thickness of the heat seal layer is 40-60 μm.
Further, the material of the bonding layer 30 is aqueous polyurethane glue.
Further, the heat-sealing layer 40 is made of a CPP material or a PE material.
Further, the material of the polyamide first reinforcement layer 22 is nylon 6.
Further, the material of the polyamide second reinforcement layer 24 is nylon 6.
The utility model provides a composite film for vacuum insulation board packaging, wherein the barrier coating has extremely low water vapor transmission rate and oxygen transmission rate, and simultaneously EVOH is arranged in the sandwich layer between the barrier coating and the heat-seal layer, thereby preventing the influence of moisture on the barrier property of EVOH and ensuring that the composite film for vacuum insulation board packaging has excellent barrier property; the polyamide layer provides excellent mechanical property and puncture resistance, a five-layer co-extrusion double-drawing process is adopted to improve the film forming property of EVOH, reduce the thickness of the surface layer to achieve the purpose of reducing the addition amount of master batch, and ensure that the thickness deviation, the haze and the light transmittance of the film meet the standard requirements of the polyamide film; the heat-sealing layer plays a role in heat sealing and a moisture blocking effect, and provides high heat-sealing strength and water-blocking performance. The composite film has the advantages of good barrier property, low heat conductivity coefficient, simple processing process, economy and practicality, and is particularly suitable for packaging vacuum insulation panels.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic diagram of the film layer structure of the composite film for packaging vacuum insulation panels provided by the present invention.
Reference numerals:
10 barrier coating 20 polyamide co-extruded layer 21 polyamide first skin layer
22 polyamide first reinforcing layer 23 EVOH layer 24 polyamide second reinforcing layer
25 Polyamide second skin layer 30 adhesive layer 40 Heat seal layer
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
For the convenience of implementation of the technical personnel in the field, the utility model provides a raw material description that each rete adopted:
the barrier coating is made of a water-resistant modified PVA coating liquid on the market; preferably, a water-resistant modified PVA coating in a patent name of a coating type high-barrier polylactic acid film and a preparation method thereof (publication No. CN110774713A) is adopted;
the first polyamide surface layer and the second polyamide surface layer are made of the existing nylon 6 material added with a trace of opening agent and slipping agent; preferably, a biaxially oriented polyamide film master batch disclosed in the patent publication "a biaxially oriented polyamide film master batch, a film and a method for producing the same" (publication No. CN103554901B) is used;
the first reinforced polyamide layer and the second reinforced polyamide layer are made of nylon 6 materials on the market;
the EVOH layer is made of polyethylene-vinyl alcohol copolymer on the market;
the bonding layer is made of water-based polyurethane glue;
the heat sealing layer is made of CPP material or Polyethylene (PE) material on the market.
The above description of the raw materials provided by the present invention is only an example description for the convenience of implementation by those skilled in the art, and it is not considered as a limitation to the protection scope of the present invention, and all the other existing materials adopted for realizing the same technical effects of the present invention are replaced and all belong to the protection scope of the present invention.
Fig. 1 is a schematic diagram of a film layer structure of a composite film for packaging a vacuum insulation panel, as shown in fig. 1, the composite film for packaging a vacuum insulation panel sequentially comprises a barrier coating layer 10, a polyamide co-extrusion layer 20, a bonding layer 30 and a heat-sealing layer 40 from outside to inside;
the polyamide co-extrusion layer 20 comprises at least one EVOH intermediate layer; the polyamide co-extrusion layer 20 is provided with reinforcing structures on two sides of the EVOH intermediate layer.
In specific implementation, the polyamide co-extrusion layer 20 is used as a core layer, the water-resistant modified PVA coating liquid is coated on the upper surface of the polyamide co-extrusion layer 20 in a double-drawing manner to prepare the barrier coating layer 10, and the heat sealing layer 40 is adhered to the lower surface of the polyamide co-extrusion layer through the bonding layer 30; the polyamide co-extrusion layer 20 is a multi-layer structure film made by co-extrusion biaxial stretching, and includes at least one EVOH middle layer, and reinforcing structures are disposed on two sides of the EVOH middle layer, preferably, those skilled in the art can use the reinforcing film layer as the reinforcing structure, that is, a reinforcing film layer is compounded on each of two sides of the EVOH middle layer.
It should be noted that fig. 1 is only an example provided by the composite film for vacuum insulation panel packaging of the present invention, and it is not excluded that more film structures are designed for other effects. Based on the utility model discloses a rete structure basis is in order to make the film have other performance effects the utility model discloses the product that sets up other retes between each layer also all belongs to the utility model discloses a protection scope.
The utility model provides a composite film for vacuum insulation board packaging, the barrier coating has extremely low water vapor transmission rate and oxygen transmission rate, and simultaneously, the EVOH film layer is arranged in the core layer between the barrier coating and the heat-sealing layer, so that the influence of moisture on the EVOH barrier property can be prevented, and the composite film for vacuum insulation board packaging is ensured to have excellent barrier property; the polyamide co-extrusion layer provides excellent barrier property, mechanical property and puncture resistance; the adhesive layer plays an adhesive role; the heat seal layer performs a heat seal function, providing high heat seal strength.
Preferably, the polyamide coextruded layer 20 is a five-layer coextruded biaxially oriented film, and the film layer structure thereof is, from outside to inside, a polyamide first surface layer 21, a polyamide first reinforced layer 22, an EVOH layer 23, a polyamide second reinforced layer 24 and a polyamide second surface layer 25 in sequence.
In the specific implementation, the polyamide first surface layer 21 and the polyamide second surface layer 25 contain an opening agent and a slipping agent to prevent the film from being sticky and broken; the polyamide first reinforcing layer 22 and the polyamide second reinforcing layer 25 provide excellent mechanical properties and puncture resistance, and prevent the packaging film from being scratched and broken, which causes vacuum failure; the EVOH layer 32 provides excellent barrier properties; the five-layer co-extrusion double-drawing process is adopted to improve the film forming property of EVOH and reduce the thickness of the surface layer, thereby achieving the purpose of reducing the addition amount of master batch and ensuring that the thickness deviation, the haze and the light transmittance of the film meet the standard requirements of polyamide films.
Preferably, the barrier coating 10 is 1-3 μm thick.
Preferably, the thickness of the polyamide co-extruded layer 20 is 15-30 μm; the thickness of the polyamide first surface layer 21 and the thickness of the polyamide second surface layer 25 are both 1-2 μm; the thickness of the EVOH layer 23 is 2-5 μm.
Preferably, the adhesive layer 30 has a thickness of 1-2 μm.
Preferably, the heat-seal layer 40 has a thickness of 40 to 60 μm.
Specifically, the thickness of the barrier coating 10 in the composite film for packaging the vacuum insulation panel can be controlled to be 2 μm by a person skilled in the art, the thickness of the polyamide co-extrusion layer 20 is controlled to be 20 μm, the thickness of the bonding layer 30 is controlled to be 1 μm, and the thickness of the heat-sealing layer 40 is controlled to be 50 μm, so that the total thickness of the composite film for packaging the vacuum insulation panel is smaller, and the composite film is more economical and practical and meets the market demand.
Although terms such as barrier coating, co-extruded polyamide layer, polyamide skin layer, reinforced polyamide layer, EVOH layer, adhesive layer and heat seal layer are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. The composite film for packaging the vacuum insulation board is characterized in that: the film layer structure sequentially comprises a barrier coating (10), a polyamide co-extrusion layer (20), a bonding layer (30) and a heat sealing layer (40) from outside to inside;
the polyamide coextruded layer (20) comprises at least one intermediate layer of EVOH; and reinforcing structures are arranged on the two sides of the EVOH intermediate layer of the polyamide co-extrusion layer (20).
2. The composite film for vacuum insulation panel packaging according to claim 1, wherein: the polyamide co-extrusion layer (20) is a five-layer co-extrusion biaxially oriented film, and the film layer structure of the polyamide co-extrusion biaxially oriented film sequentially comprises a polyamide first surface layer (21), a polyamide first enhancement layer (22), an EVOH layer (23), a polyamide second enhancement layer (24) and a polyamide second surface layer (25) from outside to inside.
3. The composite film for vacuum insulation panel packaging according to claim 1, wherein: the thickness of the barrier coating (10) is 1-3 μm.
4. The composite film for vacuum insulation panel packaging according to claim 2, wherein: the thickness of the polyamide co-extrusion layer (20) is 15-30 μm; the thickness of the first polyamide surface layer (21) and the thickness of the second polyamide surface layer (25) are both 1-2 mu m; the thickness of the EVOH layer (23) is 2-5 mu m.
5. The composite film for vacuum insulation panel packaging according to claim 1, wherein: the thickness of the adhesive layer (30) is 1-2 μm.
6. The composite film for vacuum insulation panel packaging according to claim 1, wherein: the thickness of the heat sealing layer (40) is 40-60 mu m.
7. The composite film for vacuum insulation panel packaging according to claim 1, wherein: the bonding layer (30) is made of water-based polyurethane glue.
8. The composite film for vacuum insulation panel packaging according to claim 1, wherein: the heat sealing layer (40) is made of a CPP material or a PE material.
9. The composite film for vacuum insulation panel packaging according to claim 2, wherein: the material of the polyamide first reinforced layer (22) is nylon 6.
10. The composite film for vacuum insulation panel packaging according to claim 2, wherein: the material of the polyamide second reinforced layer (24) is nylon 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020538823.0U CN212124443U (en) | 2020-04-13 | 2020-04-13 | Composite film for packaging vacuum heat insulation plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020538823.0U CN212124443U (en) | 2020-04-13 | 2020-04-13 | Composite film for packaging vacuum heat insulation plate |
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| Publication Number | Publication Date |
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| CN212124443U true CN212124443U (en) | 2020-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020538823.0U Active CN212124443U (en) | 2020-04-13 | 2020-04-13 | Composite film for packaging vacuum heat insulation plate |
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| CN (1) | CN212124443U (en) |
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- 2020-04-13 CN CN202020538823.0U patent/CN212124443U/en active Active
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