CN220095829U - Multilayer co-extrusion crease-resistant thermoforming stretch film - Google Patents
Multilayer co-extrusion crease-resistant thermoforming stretch film Download PDFInfo
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- CN220095829U CN220095829U CN202321610593.4U CN202321610593U CN220095829U CN 220095829 U CN220095829 U CN 220095829U CN 202321610593 U CN202321610593 U CN 202321610593U CN 220095829 U CN220095829 U CN 220095829U
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- 238000001125 extrusion Methods 0.000 title claims abstract description 20
- 238000003856 thermoforming Methods 0.000 title claims abstract description 10
- 229920006302 stretch film Polymers 0.000 title description 5
- 239000010410 layer Substances 0.000 claims abstract description 98
- 239000012792 core layer Substances 0.000 claims abstract description 50
- 239000004698 Polyethylene Substances 0.000 claims abstract description 38
- 239000002344 surface layer Substances 0.000 claims abstract description 35
- 239000012793 heat-sealing layer Substances 0.000 claims abstract description 29
- 229920005644 polyethylene terephthalate glycol copolymer Polymers 0.000 claims abstract description 25
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims abstract description 12
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004715 ethylene vinyl alcohol Substances 0.000 claims abstract description 12
- 230000001153 anti-wrinkle effect Effects 0.000 claims description 10
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 5
- 230000004888 barrier function Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 abstract description 2
- 238000010096 film blowing Methods 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 47
- 229920000139 polyethylene terephthalate Polymers 0.000 description 11
- 239000005020 polyethylene terephthalate Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- -1 polyethylene Polymers 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 239000002131 composite material Substances 0.000 description 6
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 5
- 229920000573 polyethylene Polymers 0.000 description 5
- 239000004677 Nylon Substances 0.000 description 4
- 238000007664 blowing Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 229920001778 nylon Polymers 0.000 description 4
- 239000002985 plastic film Substances 0.000 description 4
- 229920001169 thermoplastic Polymers 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000013039 cover film Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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- Laminated Bodies (AREA)
Abstract
The utility model discloses a multilayer co-extrusion crease-resistant thermoforming stretched film which comprises a surface layer, a core layer and a heat sealing layer, wherein the surface layer, the core layer and the heat sealing layer are sequentially arranged from top to bottom, and the surface layer, the core layer and the heat sealing layer are produced and molded through a multilayer co-extrusion film blowing process; the surface layer, the heat seal layer and the core layer are all of a multi-layer structure; each layer of structure in the heat sealing layer is any one of PE and PP, each layer of structure in the surface layer is any one of PET and PETG, and each layer of structure in the core layer is any one of PA and EVOH. The utility model prepares the multilayer co-extrusion stretching film taking PET as the surface layer through innovative structural design and material matching, and has different levels of barrier property. By utilizing the high transparency and the dimensional stability of PET, the problem of wrinkling and deformation of the bottom film of the package piece after stretch forming can be well solved.
Description
Technical Field
The utility model relates to the technical field of stretch films, in particular to a multilayer co-extrusion crease-resistant thermoforming stretch film.
Background
The thermal forming package is formed by heating and softening a thermoplastic plastic sheet and a thermoplastic plastic film, stretching and adsorbing the thermoplastic plastic sheet and the thermoplastic plastic film into a die to form a film bubble and a disc box, placing the content, thermally sealing the film with a cover film, cutting the film into an independent package, and thus, the appearance of the commodity can be clearly seen, and the thermal forming package is convenient to display and use. And the film is tightly attached to protect, so that the damage in the transportation and sales processes can be reduced.
At present, most of multilayer co-extrusion stretching films in the market are made of PA, PE, PP, TIE, EVOH and other materials, and after thermoforming, the base film is placed at normal temperature or in the sterilization process, and can retract slowly and unevenly, so that the surface is wrinkled, labels attached to the base film fall off or shrink along with the base film, and the display of product information is affected. Raised wrinkles also increase the rate of crash damage during shipping and sales.
To avoid this problem, the common method is now:
one is to increase the thickness of the base film of the stretched film, and a small increase in thickness is hardly effective, and a large increase in thickness causes an increase in cost and waste of materials, and transparency is affected. Forming in the same mould, wherein the thicker the base film is, the thicker the stretched and formed film is; the thicker the film or sheet the better the dimensional stability, the less susceptible to deformation. For example, the thickness of 150um can reach the requirements of packaging shelf life, forming puncture resistance and the like, and in order to solve bottom wrinkling, the thickness can only be increased to 275um, and the thickness is surplus by 80%. The PET co-extrusion film can achieve the effect of common 275um thickness at 150um, and 80% of the thickness of the material is not wasted additionally.
2, the other is that reinforcing ribs are added in the forming die, and although the shrinkage of the bottom film is prevented to a certain extent, the raised reinforcing ribs enable the labels to fall off more easily, so that the problem cannot be fundamentally solved.
3 furthermore, some of the stretched films on the market are produced in a composite form, such as: PET composite PE co-extrusion film and CPP composite PE co-extrusion film, the forming depth of the composite stretching film is limited, and the composite glue is easy to laminate after stretching, which is also not preferable.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provides a multilayer co-extrusion crease-resistant thermoforming stretched film which can well solve the problems of wrinkling and deformation of a bottom film of a package after stretch forming.
In order to achieve the above purpose, the technical scheme of the utility model is to provide a multilayer co-extrusion crease-resistant thermoforming stretch film, which comprises a surface layer, a core layer and a heat sealing layer, wherein the surface layer, the core layer and the heat sealing layer are sequentially arranged from top to bottom, and the surface layer, the core layer and the heat sealing layer are produced and formed by a multilayer co-extrusion film blowing process;
the surface layer, the heat seal layer and the core layer are all of a multi-layer structure; each layer of structure in the heat sealing layer is any one of PE and PP, each layer of structure in the surface layer is any one of PET and PETG, and each layer of structure in the core layer is any one of PA and EVOH.
Further, the core layer further comprises a TIE, wherein the TIE is resin with an adhesive effect in multilayer coextrusion, the PA and the EVOH are directly connected, and the PA, the PE, the PP and the PETG are connected through the TIE. The TIE can be polyethylene grafted maleic anhydride (PE-g-MAH).
Further, the tensile film has a thickness of 100-200um.
Further, the core layer is provided with 3-7 layers, and the thickness of the core layer is 50-100um.
Further, the surface layer is provided with 1-3 layers, and the thickness of the surface layer is 10-50um.
Further, the heat sealing layer is provided with 1-3 layers, and the thickness of the heat sealing layer is 30-60um.
Further, the total number of the surface layer, the core layer and the heat sealing layer is 8-12.
Further, 10 layers are altogether used for the surface layer, the core layer and the heat sealing layer, wherein the surface layer is of a 3-layer structure, the core layer is of a 5-layer structure, the heat sealing layer is of a 2-layer structure, and the surface layer, the core layer and the heat sealing layer are of a structure from top to bottom: PET/PETG/PETG/TIE/PA/TIE/PA/TIE/PE/PE, and the thickness ratio of each layer is: 10/11/10/8/11/7/11/7/12/13.
Further, 10 layers are altogether used for the surface layer, the core layer and the heat sealing layer, wherein the surface layer is of a 3-layer structure, the core layer is of a 5-layer structure, the heat sealing layer is of a 2-layer structure, and the surface layer, the core layer and the heat sealing layer are of a structure from top to bottom: PETG/PETG/PETG/TIE/PA/EVOH/PA/TIE/PE/PE, and the thickness ratio of each layer is: 8/8/11/10/12/7/12/7/12/13.
Further, 10 layers are altogether used in the top layer, the core layer and the heat seal layer, wherein, the top layer is 1 layer structure, 7 layers in the core layer, 2 layers are used in the heat seal layer, top layer, core layer and heat seal layer are from top to bottom: PETG/TIE/PE/TIE/PA/EVOH/PA/TIE/PE/PE, and the thickness ratio of each layer is: 13/8/9/7/12/7/12/7/12/13.
The utility model has the advantages and beneficial effects that:
the utility model prepares the multilayer co-extrusion stretching film taking PET as the surface layer through innovative structural design and material matching, and has different levels of (middle/high) barrier property. By utilizing the high transparency and the dimensional stability of PET, the problem of wrinkling and deformation of the bottom film of the package piece after stretch forming can be well solved.
In addition, the production process of the existing PET composite stretched film is simplified by forming films in a multilayer coextrusion mode, solvent residues in the compounding process are avoided, and the molding depth and the molding effect are greatly improved.
Drawings
FIG. 1 is a schematic structural view of a multilayer coextruded anti-wrinkle thermoformed stretched film according to the utility model;
fig. 2 is a schematic structural view of embodiment 1;
fig. 3 is a schematic structural view of embodiment 2;
fig. 4 is a schematic structural diagram of embodiment 3.
A surface layer 1, a core layer 2 and a heat sealing layer 3.
Detailed Description
The following describes the embodiments of the present utility model further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model.
The polyethylene terephthalate is abbreviated as PET; polyethylene terephthalate-1, 4-cyclohexanedimethanol ester is abbreviated as PETG; TIE is a short term for the resin which plays a role in bonding among PP, PE, PA, PET, PETG layers in multi-layer coextrusion, and polyethylene grafted maleic anhydride (PE-g-MAH) can be selected as TIE.
(one) stretched film preparation
Example 1:
as shown in fig. 2, the multilayer co-extruded film is produced by adopting a down-blowing water cooling process, the thickness of the stretched film is 150um, and 10 layers of the surface layer, the core layer and the heat sealing layer are formed, wherein the surface layer is of a 3-layer structure, the core layer is of a 5-layer structure, the heat sealing layer is of a 2-layer structure, and the surface layer, the core layer and the heat sealing layer are of a top-down structure: PET/PETG/PETG/TIE/PA/TIE/PA/TIE/PE/PE, and the thickness ratio of each layer is: 10/11/10/8/11/7/11/7/12/13, the stretched film thickness is 150um.
Wherein, the TIE is polyethylene grafted maleic anhydride (PE-g-MAH).
Example 2:
as shown in fig. 3, the multilayer co-extruded film is produced by adopting a down-blowing water cooling process, the thickness of the stretched film is 150um, and 10 layers of the surface layer, the core layer and the heat sealing layer are formed, wherein the surface layer is of a 3-layer structure, the core layer is of a 5-layer structure, the heat sealing layer is of a 2-layer structure, and the surface layer, the core layer and the heat sealing layer are of a top-down structure: PETG/PETG/PETG/TIE/PA/EVOH/PA/TIE/PE/PE, and the thickness ratio of each layer is: 8/8/11/10/12/7/12/7/12/13, the stretched film thickness is 150um.
Wherein, the TIE is polyethylene grafted maleic anhydride (PE-g-MAH).
Example 3:
as shown in fig. 4, the multilayer co-extruded film is produced by adopting a down-blowing water cooling process, the thickness of the stretched film is 150um, and 10 layers of the surface layer, the core layer and the heat sealing layer are formed, wherein the surface layer is of a 1-layer structure, the core layer is of a 7-layer structure, the heat sealing layer is of a 2-layer structure, and the surface layer, the core layer and the heat sealing layer are of a top-down structure: PETG/TIE/PE/TIE/PA/EVOH/PA/TIE/PE/PE, and the thickness ratio of each layer is: 13/8/9/7/12/7/12/7/12/13, the stretched film thickness is 150um.
Wherein, the TIE is polyethylene grafted maleic anhydride (PE-g-MAH).
Comparative example:
nylon co-extrusion film structure: PA/TIE/PE/TIE/PA/TIE/PA/TIE/PE/PE, 10 layers in total, and the thickness ratio of each layer is as follows: 10/11/10/8/11/7/11/7/12/13 the thickness of the nylon co-extrusion film is 150 mu m, and a down-blowing water cooling process is adopted to produce the multilayer co-extrusion film.
(II) Performance test
Tensile strength: the strength of the film package resisting the transverse tearing force is represented, the greater the strength is, the harder the film package is torn, and the problem of bag breaking caused by jolt collision and the like in transportation is solved;
elongation at break: the film was characterized for deep drawability, with higher elongation and greater ultimate depth of formation.
Haze: the lower the light transmission of the film, the more clear the content is seen through the film.
Thermoforming depth: the same depth was chosen for comparison here.
Volume rate change: refers to (volume after molding ≡volume after 24 hours retraction)/volume after molding, the larger the volume change, the more retraction, the more obvious the crease caused by the corresponding retraction of the bottom.
As can be seen by combining the test data in the table, the product prepared by the technical scheme is superior to the nylon co-extrusion film in the aspects of tensile strength, elongation at break, haze, thermoforming depth, volume rate change and the like under the condition that the thickness of the product is the same as the thickness of the nylon co-extrusion film.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.
Claims (10)
1. The multilayer co-extrusion crease-resistant thermoforming stretched film is characterized by comprising a surface layer, a core layer and a heat sealing layer, wherein the surface layer, the core layer and the heat sealing layer are sequentially arranged from top to bottom;
the surface layer, the heat seal layer and the core layer are all of a multi-layer structure, and the total number of the surface layer, the core layer and the heat seal layer is 8-12.
2. The multilayer coextruded anti-wrinkle thermoformed stretched film according to claim 1, wherein the stretched film has a thickness of 100-200um.
3. The multilayer coextruded anti-wrinkle thermoformed stretched film according to claim 2, wherein the core layer is provided with 3-7 layers, the core layer having a thickness of 50-100um.
4. A multilayer co-extruded anti-wrinkle thermoformed stretched film according to claim 3, wherein said skin layer is provided with 1-3 layers, said skin layer having a thickness of 10-50um.
5. The multilayer coextruded anti-wrinkle thermoformed stretched film according to claim 4, wherein the heat-seal layer is provided with 1-3 layers, the heat-seal layer having a thickness of 30-60um.
6. The multilayer coextruded anti-wrinkle thermoformed stretched film according to claim 5, wherein each of the heat-seal layers is any one of PE and PP, each of the skin layers is any one of PET and PETG, and each of the core layers is any one of PA and EVOH.
7. The multilayer coextruded anti-wrinkle thermoformed stretched film according to claim 6, wherein the core layer further comprises TIE, the TIE being a resin that adheres during multilayer coextrusion, the PA being directly connected to the EVOH, the PA being connected to the PA, PE, PP and PETG by TIE.
8. The multilayer coextruded anti-wrinkle thermoformed stretched film according to claim 7, wherein the skin layer, core layer and heat seal layer are 10 layers in total, wherein the skin layer is 3 layers in structure, the core layer is 5 layers, the heat seal layer is 2 layers in structure, and the skin layer, core layer and heat seal layer are in a top-down structure: PET/PETG/PETG/TIE/PA/TIE/PA/TIE/PE/PE, and the thickness ratio of each layer is: 10/11/10/8/11/7/11/7/12/13.
9. The multilayer coextruded anti-wrinkle thermoformed stretched film according to claim 7, wherein the skin layer, core layer and heat seal layer are 10 layers in total, wherein the skin layer is 3 layers in structure, the core layer is 5 layers, the heat seal layer is 2 layers in structure, and the skin layer, core layer and heat seal layer are in a top-down structure: PETG/PETG/PETG/TIE/PA/EVOH/PA/TIE/PE/PE, and the thickness ratio of each layer is: 8/8/11/10/12/7/12/7/12/13.
10. The multilayer coextruded anti-wrinkle thermoformed stretched film according to claim 7, wherein the skin layer, core layer and heat seal layer are 10 layers in total, wherein the skin layer is 1 layer structure, the core layer 7 layer, the heat seal layer is 2 layer structure, the skin layer, core layer and heat seal layer are from top to bottom: PETG/TIE/PE/TIE/PA/EVOH/PA/TIE/PE/PE, and the thickness ratio of each layer is: 13/8/9/7/12/7/12/7/12/13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321610593.4U CN220095829U (en) | 2023-06-25 | 2023-06-25 | Multilayer co-extrusion crease-resistant thermoforming stretch film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321610593.4U CN220095829U (en) | 2023-06-25 | 2023-06-25 | Multilayer co-extrusion crease-resistant thermoforming stretch film |
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| Publication Number | Publication Date |
|---|---|
| CN220095829U true CN220095829U (en) | 2023-11-28 |
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|---|---|---|---|
| CN202321610593.4U Active CN220095829U (en) | 2023-06-25 | 2023-06-25 | Multilayer co-extrusion crease-resistant thermoforming stretch film |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220095829U (en) |
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- 2023-06-25 CN CN202321610593.4U patent/CN220095829U/en active Active
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