CN220163395U - Recyclable high-barrier easy-to-uncover cover film - Google Patents
Recyclable high-barrier easy-to-uncover cover film Download PDFInfo
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- CN220163395U CN220163395U CN202320686815.4U CN202320686815U CN220163395U CN 220163395 U CN220163395 U CN 220163395U CN 202320686815 U CN202320686815 U CN 202320686815U CN 220163395 U CN220163395 U CN 220163395U
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- 239000013039 cover film Substances 0.000 title claims description 10
- 239000010410 layer Substances 0.000 claims abstract description 127
- 230000004888 barrier function Effects 0.000 claims abstract description 49
- 239000003292 glue Substances 0.000 claims abstract description 45
- 239000005026 oriented polypropylene Substances 0.000 claims abstract description 43
- 229920006378 biaxially oriented polypropylene Polymers 0.000 claims abstract description 35
- 239000011127 biaxially oriented polypropylene Substances 0.000 claims abstract description 35
- 238000007789 sealing Methods 0.000 claims abstract description 34
- 239000011241 protective layer Substances 0.000 claims abstract description 31
- 238000013329 compounding Methods 0.000 claims abstract description 22
- 238000010025 steaming Methods 0.000 claims abstract description 17
- 229910052809 inorganic oxide Inorganic materials 0.000 claims abstract description 13
- 238000010411 cooking Methods 0.000 claims abstract description 4
- 239000010408 film Substances 0.000 claims description 54
- 229920002635 polyurethane Polymers 0.000 claims description 12
- 239000004814 polyurethane Substances 0.000 claims description 12
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 6
- 239000002131 composite material Substances 0.000 abstract description 50
- 238000004064 recycling Methods 0.000 abstract description 5
- 235000013305 food Nutrition 0.000 abstract description 4
- 229920006280 packaging film Polymers 0.000 abstract description 2
- 239000012785 packaging film Substances 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 76
- 238000000034 method Methods 0.000 description 49
- 238000010030 laminating Methods 0.000 description 32
- 239000011248 coating agent Substances 0.000 description 25
- 238000000576 coating method Methods 0.000 description 25
- 239000000758 substrate Substances 0.000 description 24
- 229910000831 Steel Inorganic materials 0.000 description 18
- 239000010959 steel Substances 0.000 description 18
- 238000012937 correction Methods 0.000 description 14
- 238000007639 printing Methods 0.000 description 14
- 229920001971 elastomer Polymers 0.000 description 12
- 238000002360 preparation method Methods 0.000 description 11
- 238000004513 sizing Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 9
- 238000001816 cooling Methods 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 238000009835 boiling Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012793 heat-sealing layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 235000011888 snacks Nutrition 0.000 description 1
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- Laminated Bodies (AREA)
Abstract
The utility model provides a recyclable high-barrier easy-uncovering film, which is formed by compounding a heat-resistant protective layer, a barrier layer and a heat-sealing easy-uncovering layer, wherein the heat-resistant protective layer is BOPP (biaxially-oriented polypropylene film) or OPP (unidirectionally-oriented polypropylene film), the barrier layer is OPP plated with inorganic oxide, and the heat-sealing easy-uncovering layer is RCPP (cooking CPP film); the heat-resistant protective layer is compounded with the barrier layer through a steaming-resistant glue layer, and the barrier layer is compounded with the heat-sealing easy-uncovering layer through the steaming-resistant glue layer. The easy-to-uncover film realizes high barrier and recycling of products, and the physical and chemical properties of the appearance, the tensile strength, the composite strength, the heat sealing strength and the like of the easy-to-uncover film can meet the requirements of food packaging films.
Description
Technical Field
The utility model relates to the technical field of food packaging, in particular to a recyclable high-barrier easy-to-uncover film.
Background
The cover film is a composite film used for sealing the opening at the top of the container, and in daily life, articles which are frequently used or contacted by people, such as yoghurt, beverages, medicines, high-speed rail snack boxes and the like, are packaged by adopting an aluminum foil cover film in consideration of personal safety, so that the requirements of the fields of food and medicine packaging are growing; the cover film used in daily life is generally a composite film, the common composite film is generally unrecoverable or has low recovery rate, a large amount of unrecoverable backlog or destruction can cause certain pollution to the environment, time and resources are wasted greatly, and the cost is increased; the traditional film covering die cutting machine has the defects that the finished film covering is scattered randomly after the die cutting, manual arrangement is needed, the process is a complicated process, and the cost is increased intangibly. The following problems exist in the prior art:
1. the existing recyclable high-barrier steaming-resistant easy-to-tear cover film and the preparation process thereof have the defects of lower product barrier, higher sealing temperature and difficult tearing;
2. the existing recyclable high-barrier steaming-resistant easy-to-uncover film and the preparation process thereof are inconvenient to realize recycling and can not effectively reduce the cost.
Disclosure of Invention
In order to solve the technical problems, the utility model provides the recyclable high-barrier easy-to-uncover film, which realizes high barrier and recycling, and the physical and chemical properties of appearance, tensile strength, composite strength, heat sealing strength and the like of the film can meet the requirements of food packaging films.
In order to achieve one of the purposes of the utility model, the utility model provides a recyclable high-barrier easy-uncovering film, which is formed by compounding a heat-resistant protective layer, a barrier layer and a heat-sealing easy-uncovering layer, wherein the heat-resistant protective layer is BOPP (biaxially oriented polypropylene film) or OPP (unidirectionally oriented polypropylene film), the barrier layer is OPP plated with inorganic oxide, and the heat-sealing easy-uncovering layer is RCPP (cooking CPP film); the heat-resistant protective layer is compounded with the barrier layer through a steaming-resistant glue layer, and the barrier layer is compounded with the heat-sealing easy-uncovering layer through the steaming-resistant glue layer.
The OPP plated with inorganic oxide is preferably OPP-ALOx or SiO 2 -OPP。
Preferably, the steaming-resistant glue layer adopts two-component polyurethane glue or two-component solvent-free glue.
The thickness of the heat-resistant protective layer is 18-28 mu m, the thickness of the barrier layer is 15-20 mu m, and the thickness of the heat-sealing easy-uncovering layer is 40-70 mu m.
Preferably, the thickness of the heat-resistant protective layer is 20-25 μm, the thickness of the barrier layer is 17-19 μm, and the thickness of the heat-seal easy-to-tear-off layer is 50-60 μm.
The heat-resistant protective layer and the barrier layer are compounded in a dry mode, and the barrier layer and the heat-sealing easy-uncovering layer are compounded in a dry mode.
The preparation method of the recyclable high-barrier easy-to-uncover film comprises the following steps:
(1) Printing BOPP or OPP by using a printing device of a printing machine, and drying to obtain a BOPP/INK layer or an OPP/INK layer;
(2) Dry compounding: compounding the BOPP/INK layer or the OPP/INK layer obtained in the step (1) with OPP plated with inorganic oxide by adopting a dry compounding process to form a first compound layer;
(3) Putting the obtained composite layer I into a curing chamber for curing;
(4) Dry compounding: compounding the cured composite layer I with RCPP by adopting a dry compounding process to form a composite layer II;
(5) Putting the obtained composite layer II into a curing chamber for curing;
(6) Cutting the cured composite layer II into required width.
Further, the specific operation steps in the step (1) are as follows: and (3) placing the BOPP film roll on an unreeling frame of a printer, placing the prepared printing INK into an INK duct of the printer, printing the BOPP film by using a printing device of the printer, and drying to obtain the BOPP/INK film.
In the step (2), the BOPP/INK layer or the OPP/INK layer obtained in the step (1) is taken as a first unreeling substrate, then the first unreeling substrate enters a coating system in parallel and flattened mode after transverse deviation correction under a certain tension condition, and a coating roller is pressurized by a glue pressing roller, so that the steaming-resistant glue is uniformly transferred to a printing surface of the BOPP/INK layer or the OPP/INK layer of the first unreeling substrate; after the first unreeled base material subjected to gluing passes through an oven, taking the OPP plated with the inorganic oxide as a second unreeled base material, enabling the second unreeled base material to be parallel and flattened under a certain tension condition, laminating the second unreeled base material with the first unreeled base material through a laminating roller and a composite steel roller under a certain pressure to obtain a first composite layer, and cooling and then rolling the first composite layer through a cooling roller.
In the step (2), the applied tension of the first unreeled base material in the transverse deviation correction is 60-90N, and the pressure of the coating roller passing through the rubber-covered roller is 0.2-0.4Mpa/cm 2 The sizing amount of the steaming-resistant glue is 4.0-5.0g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The tension of the second unreeled base material when being spread is 25-45N, and the pressure of the laminating roller and the composite steel roller when being laminated is 0.4-0.5Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The temperature of the first unreeled base material passing through the oven is 60-80 ℃; when the first unreeled base material and the second unreeled base material are laminated, the temperature of the laminating roller is controlled to be 40-50 ℃.
Further preferably, in the step (2), the first unreeled substrate has an applied tension of 80N at the time of lateral deviation correction, and the pressure of the coating roller passing through the squeeze roller is 0.30Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The tension of the second unreeled base material when being spread is 35N, and the pressure of the laminating roller and the composite steel roller when being laminated is 0.45Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The first unreeling baseThe temperature of the material passing through the oven was 70 ℃.
In the step (3), the curing temperature is controlled to be 45-50 ℃ and the curing time is 12-24h.
In the step (4), taking the cured composite layer I as a first unreeled base material, transversely rectifying the first unreeled base material under a certain tension condition, then parallelly flattening the first unreeled base material, and feeding the first unreeled base material into a coating system, wherein a coating roller is pressurized by a rubber roller, so that the boiling-resistant glue is uniformly transferred to a corona surface of an OPP layer coated with inorganic oxide of the first unreeled base material; after the first unreeled base material subjected to gluing passes through an oven, RCPP is used as a second unreeled base material, the second unreeled base material is flattened in parallel under a certain tension condition, and is laminated with the first unreeled base material through a laminating roller and a composite steel roller to obtain a composite layer II, and is cooled through a cooling roller and then is rolled.
In the step (4), the tension of the first unreeled substrate during the transverse deviation correction is 70-90N, and the pressure of the coating roller passing through the rubber covered roller is 0.2-0.4Mpa/cm 2 The sizing amount of the steaming-resistant glue is 4.0-5.0g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The tension of the second unreeled base material when being spread is 35-45N, and the pressure of the laminating roller and the composite steel roller when being laminated is 0.4-0.6Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The temperature of the first unreeled base material when passing through the oven is 60-80 ℃, and the temperature of the laminating roller is controlled to be 40-50 ℃.
Further preferably, the tension of the first unreeled substrate at the time of transverse deviation correction is 80N, and the pressure of the coating roller passing through the glue pressing roller is 0.30Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The tension of the second unreeled base material when being spread is 40N, and the pressure of the laminating roller and the composite steel roller when being laminated is 0.45Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The first unreeled substrate was passed through an oven at a temperature of 70 ℃.
The curing temperature is controlled to be 45-50 ℃, and the curing time is 120h.
Compared with the prior art, the utility model has the beneficial effects that:
the BOPP (biaxially oriented polypropylene film) or OPP (unidirectional oriented polypropylene film) is used as a heat-resistant protective layer, the OPP plated with inorganic oxide is used as a barrier layer, and the RCPP is used as a heat-sealing layer in the easy-to-uncover film structure, so that the film structure ensures the high barrier, steaming and puncture resistance of the product while being easy to uncover.
The utility model realizes the low sealing temperature and tearing force of the film structure through the combination of various film layers.
The easy-to-uncover film structure not only realizes excellent use performance, but also is a good environment-friendly material, thereby being capable of realizing subsequent recycling. The preparation method of the membrane structure adopts a dry type composite process and is matched with the steaming-resistant glue, so that the use of the adhesive is reduced, the harm of an organic solvent is reduced, the VOC emission in the production process is reduced, and the environment-friendly effect is achieved.
Drawings
FIG. 1 is a block diagram of a recyclable high barrier frangible cover film of the present utility model;
FIG. 2 is a flow chart of the process for making the recyclable high barrier easy-to-tear film of the present utility model.
In the figure: 1. a heat-resistant protective layer; 2. a barrier layer, 3, a heat-sealing easy-to-uncover layer.
Detailed Description
The present utility model will be further described in detail with reference to the following examples, which are provided to enable one of ordinary skill in the art to make and use the present utility model without undue effort.
The present utility model employs the following abbreviations:
BOPP: biaxially oriented polypropylene film;
OPP: a uniaxially stretched polypropylene film;
RCPP: cooking the CPP film;
OPP-ALO x : alumina plated OPP; the biaxially oriented polypropylene film is used as a base material, aluminum oxide is plated on the surface of the film through vapor deposition equipment, and the biaxially oriented polypropylene film has the advantages of excellent oxygen and humidity resistance, high transparency, no color, environmental protection and the like, and is single in material and recyclable.
SiO 2 -OPP: OPP plated with silicon oxide; the method takes a biaxially oriented polypropylene film as a base material, and SiO is carried out by vapor deposition equipment 2 Plating on the surface of the film.
As shown in figure 1, the recyclable high-barrier easy-to-uncovering film is formed by compounding a heat-resistant protective layer 1, a barrier layer 2 and a heat-sealing easy-to-uncovering layer 3, wherein the heat-resistant protective layer 1 is a biaxially oriented polypropylene film or a unidirectionally oriented polypropylene film, the barrier layer 2 is OPP plated with inorganic oxide, and the heat-sealing layer 3 is a boiling CPP film; the heat-resistant protective layer 1 is compounded with the barrier layer 2 through a steaming-resistant glue layer, and the barrier layer is compounded with the heat-seal easy-uncovering layer through the steaming-resistant glue layer.
As shown in FIG. 2, the preparation method of the recyclable high-barrier easy-to-uncover film comprises the following steps: (1) Printing BOPP or OPP by using a printing device of a printing machine, and drying to obtain a BOPP/INK layer or an OPP/INK layer; (2) dry compounding: compounding the BOPP/INK layer or the OPP/INK layer obtained in the step (1) with OPP plated with inorganic oxide by adopting a dry compounding process to form a first compound layer; (3) putting the obtained composite layer I into a curing chamber for curing; (4) dry compounding: compounding the cured composite layer I with RCPP by adopting a dry compounding process to form a composite layer II; (5) putting the obtained composite layer II into a curing chamber for curing; (6) Cutting the cured composite layer II into required width.
The specific preparation method of the easy-to-open cover film and the technical effects that the product can achieve are further described below by examples and comparative examples.
Example 1
In the embodiment, BOPP is selected as the heat-resistant protective layer 1, OPP-ALOx is selected as the barrier layer 2, and RCPP is selected as the heat-sealing easy-to-uncover layer 3; wherein the thickness of the heat-resistant protective layer 1 is 20 mu m, the thickness of the barrier layer 2 is 17 mu m, and the thickness of the heat-sealing easy-uncovering layer 3 is 60 mu m. The preparation method comprises the following specific steps:
(1) And (3) placing the BOPP film roll on an unreeling frame of a printer, placing the prepared printing INK into an INK duct of the printer, printing the BOPP film by using a printing device of the printer, and drying to obtain the BOPP/INK film.
(2) Dry compounding: compounding the BOPP/INK layer or the OPP/INK layer obtained in the step (1) with OPP plated with inorganic oxide by adopting a dry compounding process to form a first compound layer;
taking the BOPP/INK layer obtained in the step (1) as a first unreeled substrate, transversely rectifying the first unreeled substrate under a certain tension condition, then enabling the first unreeled substrate to enter a coating system in parallel and flatly, and enabling a coating roller to uniformly transfer the bicomponent polyurethane glue to the printing surface of the BOPP/INK layer of the first unreeled substrate by the pressurizing force of a glue pressing roller; after the first unreeled base material subjected to glue coating passes through an oven, taking OPP-ALOx as a second unreeled base material, enabling the second unreeled base material to be parallel and flattened under a certain tension condition, laminating the second unreeled base material with the first unreeled base material through a laminating roller and a composite steel roller under a certain pressure to obtain a first composite layer, and cooling and then rolling the first composite layer through a cooling roller. The applied tension of the first unreeled base material is 80N when the first unreeled base material is transversely corrected, the pressure of a coating roller passing through a glue pressing roller is 0.3Mpa/cm < 2 >, and the glue coating amount of the double-component polyurethane glue is 4.0g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The tension of the second unreeled base material when being spread is 35N, and the pressure of the laminating roller and the composite steel roller when being laminated is 0.45Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The temperature of the first unreeled base material passing through the oven is 70 ℃; when the first unreeled base material and the second unreeled base material are laminated, the temperature of the laminating roller is controlled to be 40-50 ℃.
(3) Putting the obtained composite layer I into a curing chamber for curing; in the step (3), the curing temperature is controlled to be 45-50 ℃ and the curing time is 24 hours.
(4) Dry compounding: compounding the cured composite layer I with RCPP by adopting a dry compounding process to form a composite layer II;
taking the cured composite layer I as a first unreeled substrate, transversely rectifying the first unreeled substrate under a certain tension condition, and then enabling the first unreeled substrate to enter a coating system in parallel and flatly, wherein a coating roller is pressurized by a rubber roller, so that the bi-component polyurethane glue is uniformly transferred to a corona surface of an OPP layer of the first unreeled substrate, wherein the OPP layer is plated with inorganic oxide; after the first unreeled base material subjected to glue coating passes through a baking oven, RCPP is used as a second unreeled base material, the second unreeled base material is flattened in parallel under a certain tension condition, and is laminated with the first unreeled base material through a laminating roller and a composite steel rollerAnd obtaining a second composite layer, cooling the second composite layer by a cooling roller, and then rolling the second composite layer. The tension of the first unreeled substrate during transverse deviation correction is 80N, and the pressure of the coating roller passing through the rubber pressing roller is 0.3Mpa/cm 2 The sizing amount of the two-component polyurethane glue is 5.0g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The tension of the second unreeled base material when being spread is 40N, and the pressure of the laminating roller and the composite steel roller when being laminated is 0.45Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The temperature of the first unreeled base material when passing through the oven is 70 ℃, and the temperature of the laminating roller is controlled to be 40-50 ℃.
(5) Putting the obtained composite layer II into a curing chamber for curing; in the step (5), the curing temperature is controlled to be 45-50 ℃, and the curing time is 120h.
(6) Cutting the cured composite layer II into required width.
Example 2
The specific preparation procedure of example 2 was identical compared to example 1, using the following corresponding parameters:
in this embodiment, the heat-resistant protective layer 1 is BOPP, and the barrier layer 2 is SiO 2 -OPP, RCPP is selected as the heat-sealing easy-to-uncover layer 3; wherein, the thickness of the heat-resistant protective layer 1 is 25 mu m, the thickness of the barrier layer 2 is 19 mu m, and the thickness of the heat-sealing easy-uncovering layer 3 is 50 mu m.
In the step (2), the applied tension of the first unreeled substrate in the transverse deviation correction is 90N, and the pressure of the coating roller passing through the rubber covered roller is 0.3Mpa/cm 2 The sizing amount of the two-component polyurethane glue is 4.5g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The tension of the second unreeled base material when being spread is 40N, and the pressure of the laminating roller and the composite steel roller when being laminated is 0.4Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The temperature of the first unreeled base material passing through the oven is 80 ℃; when the first unreeled base material and the second unreeled base material are laminated, the temperature of the laminating roller is controlled to be 40-50 ℃.
In the step (3), the curing temperature is controlled to be 45-50 ℃ and the curing time is 24 hours.
In the step (4), the tension of the first unreeled substrate during the transverse deviation correction is 70N, and the pressure of the coating roller passing through the rubber covered roller is 0.3Mpa/cm 2 The sizing amount of the two-component polyurethane glue is 5.0g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The second partThe tension of the unreeled base material when being spread is 45N, and the pressure of the laminating roller and the composite steel roller when being laminated is 0.45Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The temperature of the first unreeled base material when passing through the oven is 70 ℃, and the temperature of the laminating roller is controlled to be 40-50 ℃.
In the step (5), the curing temperature is controlled to be 45-50 ℃, and the curing time is 120h.
Example 3
The specific preparation procedure of example 3, compared to example 1, was identical, using the following corresponding parameters:
in the embodiment, the heat-resistant protective layer 1 is OPP, the barrier layer 2 is OPP-ALOx, and the heat-sealing easy-to-uncover layer 3 is RCPP; wherein, the thickness of the heat-resistant protective layer 1 is 18 mu m, the thickness of the barrier layer 2 is 20 mu m, and the thickness of the heat-sealing easy-uncovering layer 3 is 70 mu m.
In the step (2), the applied tension of the first unreeled substrate in the transverse deviation correction is 90N, and the pressure of the coating roller passing through the rubber covered roller is 0.4Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the Selecting a bi-component solvent-free glue, wherein the sizing amount of the bi-component solvent-free glue is 5.0g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The tension of the second unreeled base material when being spread is 30N, and the pressure of the laminating roller and the composite steel roller when being laminated is 0.5Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The temperature of the first unreeled base material passing through the oven is 70 ℃; when the first unreeled base material and the second unreeled base material are laminated, the temperature of the laminating roller is controlled to be 40-50 ℃.
In the step (3), the curing temperature is controlled to be 45-50 ℃ and the curing time is 12h.
In the step (4), the tension of the first unreeled substrate during the transverse deviation correction is 80N, and the pressure of the coating roller passing through the rubber covered roller is 0.3Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the Selecting a bi-component solvent-free glue, wherein the sizing amount of the bi-component solvent-free glue is 5.0g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The tension of the second unreeled base material when being spread is 45N, and the pressure of the laminating roller and the composite steel roller when being laminated is 0.5Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The temperature of the first unreeled base material when passing through the oven is 70 ℃, and the temperature of the laminating roller is controlled to be 40-50 ℃.
In the step (5), the curing temperature is controlled to be 45-50 ℃, and the curing time is 120h.
Example 4
The specific preparation procedure of example 4, compared to example 1, was identical, using the following corresponding parameters:
in this embodiment, the heat-resistant protective layer 1 is OPP, and the barrier layer 2 is SiO 2 -OPP, RCPP is selected as the heat-sealing easy-to-uncover layer 3; wherein the thickness of the heat-resistant protective layer 1 is 28 mu m, the thickness of the barrier layer 2 is 15 mu m, and the thickness of the heat-sealing easy-uncovering layer 3 is 40 mu m.
In the step (2), the applied tension of the first unreeled substrate in the transverse deviation correction is 60N, and the pressure of the coating roller passing through the rubber covered roller is 0.3Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the Selecting a bi-component solvent-free glue, wherein the sizing amount of the bi-component solvent-free glue is 4.0g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The tension of the second unreeled base material when being spread is 35N, and the pressure of the laminating roller and the composite steel roller when being laminated is 0.4Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The temperature of the first unreeled base material passing through the oven is 80 ℃; when the first unreeled base material and the second unreeled base material are laminated, the temperature of the laminating roller is controlled to be 40-50 ℃.
In the step (3), the curing temperature is controlled to be 45-50 ℃ and the curing time is 12h.
In the step (4), the tension of the first unreeled substrate during the transverse deviation correction is 70N, and the pressure of the coating roller passing through the rubber covered roller is 0.4Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the Selecting a bi-component solvent-free glue, wherein the sizing amount of the bi-component solvent-free glue is 4.0g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The tension of the second unreeled base material when being spread is 35N, and the pressure of the laminating roller and the composite steel roller when being laminated is 0.4Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The temperature of the first unreeled base material when passing through the oven is 70 ℃, and the temperature of the laminating roller is controlled to be 40-50 ℃.
In the step (5), the curing temperature is controlled to be 45-50 ℃, and the curing time is 120h.
Example 5
The specific preparation procedure of example 5, compared to example 1, was identical, using the following corresponding parameters:
in this embodiment, the heat-resistant protective layer 1 is BOPP, and the barrier layer 2 is SiO 2 -OPP, RCPP is selected as the heat-sealing easy-to-uncover layer 3; wherein the thickness of the heat-resistant protective layer 1The thickness of the barrier layer 2 was 18 μm and the thickness of the heat-sealable and easy-to-peel layer 3 was 55. Mu.m, which was 23. Mu.m.
In the step (2), the applied tension of the first unreeled substrate in the transverse deviation correction is 80N, and the pressure of the coating roller passing through the rubber covered roller is 0.3Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the Selecting and using double-component polyurethane glue, wherein the sizing amount of the double-component polyurethane glue is 5.0g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The tension of the second unreeled base material when being spread is 30N, and the pressure of the laminating roller and the composite steel roller when being laminated is 0.4Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The temperature of the first unreeled base material passing through the oven is 65 ℃; when the first unreeled base material and the second unreeled base material are laminated, the temperature of the laminating roller is controlled to be 40-50 ℃.
In the step (3), the curing temperature is controlled to be 45-50 ℃ and the curing time is 12h.
In the step (4), the tension of the first unreeled substrate during the transverse deviation correction is 85N, and the pressure of the coating roller passing through the rubber covered roller is 0.3Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the Selecting and using double-component polyurethane glue, wherein the sizing amount of the double-component polyurethane glue is 5.0g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The tension of the second unreeled base material when being spread is 45N, and the pressure of the laminating roller and the composite steel roller when being laminated is 0.6Mpa/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The temperature of the first unreeled base material when passing through the oven is 80 ℃, and the temperature of the laminating roller is controlled to be 40-50 ℃.
In the step (5), the curing temperature is controlled to be 45-50 ℃, and the curing time is 120h.
Comparative example 1
Comparative example 1 an existing product PET-ALOx13/NY25/RCPP70 was used, wherein PET-ALOx is ultra high barrier PET coated with alumina and NY is nylon; the PET-ALOx, NY, RCPP film layers are compounded to form a material, and the thicknesses of the three film layers are 13 mu m, 15 mu m and 70 mu m respectively.
By testing the materials of examples and comparative example 1, the following test results were obtained:
table 1 test of the performance of examples and comparative examples
As shown by the test results in the table, the water vapor transmittance of the product with the environment-friendly structure in the embodiment of the utility model is 0.3-0.5g/m2.Day, and the oxygen transmittance is 0.2-0.3cm3/m2.Day, which are basically consistent with those of the comparative example 1, so that the service performance of the product is ensured. As for heat sealing, the heat sealing can be carried out at 180-190 ℃ in comparative example 1, while the heat sealing is carried out at 165 ℃ at most in the environment-friendly structure in the embodiment of the utility model, and the heat sealing strength is lower than that in comparative example 1 due to the fact that the heat sealing is carried out at the most ideal temperature due to the heat resistance level of the BOPP on the surface layer, but the heat sealing strength of the environment-friendly structure can still meet the customer standard. For the peel strength of the environment-friendly structure, the heat-resistant protective layer and the barrier layer and the heat-sealing easy-to-tear layer are not high in comparative example 1, but are not layered after water boiling or boiling sterilization, and the use standard of customers is met. More importantly, however, compared with the materials used in the prior art, the materials used in the product are environment-friendly and recyclable, and the product has the advantages of excellent use performance and subsequent environment-friendly and recyclable performances.
In summary, it can be known that the combination of the film materials in the easy-to-uncover film structure ensures excellent service performance while the film structure is easy to uncover, and the material of the film layer is a more environment-friendly material compared with the prior art, so that the subsequent recycling can be realized. In the production process of the product, a dry type composite technology is selected and matched with the steaming-resistant glue, so that the use of the adhesive is reduced, the harm of an organic solvent is reduced, and the environmental protection level is further improved.
In summary, although the present utility model has been described in terms of the preferred embodiments, the preferred embodiments are not limited to the above embodiments, and various modifications and changes can be made by one skilled in the art without departing from the spirit and scope of the utility model, and the scope of the utility model is defined by the appended claims.
Claims (6)
1. The recyclable high-barrier easy-to-uncovering film is characterized by being formed by compounding a heat-resistant protective layer, a barrier layer and a heat-sealing easy-to-uncovering layer, wherein the heat-resistant protective layer is BOPP (biaxially oriented polypropylene film) or OPP (unidirectionally oriented polypropylene film), the barrier layer is OPP plated with inorganic oxide, and the heat-sealing easy-to-uncovering layer is RCPP (cooking CPP film); the heat-resistant protective layer is compounded with the barrier layer through a steaming-resistant glue layer, and the barrier layer is compounded with the heat-sealing easy-uncovering layer through the steaming-resistant glue layer.
2. The recyclable high barrier release film according to claim 1, wherein the inorganic oxide coated OPP is preferably OPP-ALO x Or SiO 2 -OPP。
3. The recyclable high barrier release cover film according to claim 1 or 2, wherein the retort glue layer is a two-component polyurethane glue or a two-component solvent-free glue.
4. The recyclable high barrier release cover film according to claim 1 or 2, wherein the heat resistant protective layer has a thickness of 18 to 28 μm, the barrier layer has a thickness of 15 to 20 μm, and the heat seal release layer has a thickness of 40 to 70 μm.
5. The recyclable high barrier release film according to claim 4, wherein the heat resistant protective layer has a thickness of 20 to 25 μm, the barrier layer has a thickness of 17 to 19 μm, and the heat seal release layer has a thickness of 50 to 60 μm.
6. The recyclable high barrier release film according to claim 1, 2 or 5, wherein the heat resistant protective layer is dry-compounded with the barrier layer and the barrier layer is dry-compounded with the heat sealable release layer.
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