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CN111548521A - Transparent easy-to-tear cover film thermally sealed with APET tray - Google Patents

Transparent easy-to-tear cover film thermally sealed with APET tray Download PDF

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Publication number
CN111548521A
CN111548521A CN202010410751.6A CN202010410751A CN111548521A CN 111548521 A CN111548521 A CN 111548521A CN 202010410751 A CN202010410751 A CN 202010410751A CN 111548521 A CN111548521 A CN 111548521A
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coating
heat
copolymer
apet
seal
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Inventor
冯润财
张羽
高虎
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Huizhou Alcan Packaging Propack Co ltd
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Huizhou Alcan Packaging Propack Co ltd
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Priority to CN202010410751.6A priority Critical patent/CN111548521A/en
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/052—Forming heat-sealable coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
    • C09D179/02—Polyamines
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2475/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2479/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2461/00 - C08J2477/00
    • C08J2479/02—Polyamines
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/10—Transparent films; Clear coatings; Transparent materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

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  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention discloses a transparent easy-to-uncover cover film thermally sealed with an APET (amorphous polyethylene terephthalate) tray, which comprises a base material and a heat-seal coating coated on the base material, wherein the heat-seal coating is obtained by drying a heat-seal adhesive coating after coating; the base material is one of PET, PC, NY, BOPP, CPP or PE; the heat-seal adhesive coating comprises the following components in parts by weight: 100 portions of resin, 0 to 10 portions of additive and 600 portions of solvent; the thickness of the heat-seal coating is 0.5-15 μm. The transparent easy-to-uncover cover film thermally sealed with the APET tray adopts a solution coating processing mode to coat the heat seal adhesive coating on the base material, and has the advantages of high transparency, low odor and reliable sealing.

Description

Transparent easy-to-tear cover film thermally sealed with APET tray
Technical Field
The invention relates to the technical field of packaging materials, in particular to a transparent easy-to-tear cover film thermally sealed with an APET tray.
Background
At present, the packaging product of the blister tray and the easy-to-open cover film is widely applied to the packaging procedures of cooked food, dry fruits, fresh fruits and vegetables and other products. Because amorphous polyethylene terephthalate (APET) has the characteristics of low cost, high transparency, environmental protection, easy processing and excellent physical and mechanical properties, APET is often used as a tray in a "blister tray + easy-to-tear cover film" packaged product.
The easy-to-uncover cover film thermally sealed with APET is mainly made of ethylene-vinyl acetate copolymer (EVA) and is prepared by the following two methods: (1) the multilayer coextrusion blown film is formed by laminating the multilayer coextrusion film with EVA with other films, and the lamination can adopt processing modes such as dry lamination, solvent-free and the like; (2) and coating an EVA layer on the surface of other films.
However, the easy-release films prepared by the above two methods generally have the following problems:
(1) because residual monomers may exist in the synthesis process of the EVA resin, the EVA has poor heat resistance and causes the cover film to have peculiar smell; (2) the multilayer co-extruded film or the spraying layer is thicker, the thickness is usually more than 20 mu m, and the recycling of the discarded package is not facilitated; (3) due to the difference of the materials of the EVA and the APET, the tearing-off mode after the EVA and the APET are sealed is interface peeling, and the situation of poor heat sealing can occur in the packaging occasions with water or oil.
Disclosure of Invention
The invention provides a transparent easy-to-uncover cover film thermally sealed with an APET tray, which is prepared by coating a heat-seal adhesive coating on a base material in a solution coating processing mode and has the advantages of high transparency, low odor and reliable sealing.
In order to achieve the purpose, the invention provides the following technical scheme:
a transparent easy-to-uncover cover film thermally sealed with an APET tray comprises a base material and a heat-seal coating coated on the base material, wherein the heat-seal coating is obtained by drying a heat-seal adhesive coating after coating;
the base material is one of PET, PC, NY, BOPP, CPP or PE;
the heat-seal adhesive coating comprises the following components in parts by weight: 100 portions of resin, 0 to 10 portions of additive and 200 portions of solvent are 1150 portions;
the thickness of the heat-seal coating is 0.5-15 μm.
As a further description of the technical solution of the present invention, the resin includes at least one of acrylic resin, acrylate resin, methacrylic resin, methacrylate resin, polyester, copolyester resin, polyvinyl acetate and a copolymer thereof, polyethylene and a copolymer thereof, polyvinyl chloride and a copolymer thereof, polypropylene and a copolymer thereof, chlorinated polypropylene and a copolymer thereof, polystyrene and a copolymer thereof, polyurethane and a copolymer thereof, polyamide and a copolymer thereof, polyether and a copolymer thereof, amino resin and a copolymer thereof, polyethyleneimine and a copolymer thereof, silicone resin, modified cellulose, polyvinylidene chloride and a copolymer thereof, polyvinylidene fluoride and a copolymer thereof.
As a further description of the technical solution of the present invention, the solvent is a low boiling point solvent including at least one of ethanol, ethyl acetate, propyl acetate, butyl acetate, isopropyl alcohol, n-propyl alcohol, butyl alcohol, isobutyl alcohol, n-hexane, heptane, isooctane, methyl ethyl ketone.
As a further elaboration of the solution according to the invention, the heat-seal coating has a coating thickness in the substrate of 1-12 μm.
As a further description of the technical solution of the present invention, the heat seal coating is coated on the substrate in a one-time coating manner, or in a multi-layer coating manner.
As further described in the technical scheme of the invention, the heat seal strength of the transparent easy-to-open cover film and APET is 2-25N/15 mm.
The invention has the beneficial effects that: the transparent easy-to-uncover cover film thermally sealed with the APET tray, provided by the invention, is prepared by coating the heat-seal adhesive coating on the base material in a solution coating processing mode, and has the advantages of high transparency, low odor and reliable sealing.
Detailed Description
The technical solution of the invention is further described below with reference to specific examples.
Example 1
A transparent easy-release film heat-sealed with an APET tray comprises a polyester film with a thickness of 23 μm and a heat-seal coating coated on the polyester film. Wherein the heat seal coating is obtained by coating two layers.
The first layer of coating comprises the following components in parts by weight:
100 portions of polyurethane resin emulsion (solid content is 50 percent)
25 parts of deionized water;
the glass transition temperature of the polyurethane resin is 25 ℃, and the number average molecular weight is 8000; and obtaining the first layer of milky white coating according to the weight parts, wherein the solid content of the coating is about 40%.
The second layer of coating comprises the following components in parts by weight:
copolyester A30 parts
70 portions of copolyester B
Polyethylene wax powder as opening agent in 2 weight portions
1 part of organosilicon slipping agent
800 parts of ethyl acetate
100 parts of butyl acetate;
wherein the glass transition temperature of the copolyester A is-38 ℃, the number average molecular weight is 36000, and the acid value is 4; copolyester B had a glass transition temperature of 52 deg.C, a number average molecular weight of 12000, and an acid number of 2. And obtaining a second layer of milky white coating according to the weight parts, wherein the solid content of the coating is about 10%.
The transparent easy-to-uncover cover film thermally sealed with the APET tray has the specific preparation method that: coating a first layer of milky white coating on a transparent polyester film with the thickness of 23 mu m by using a anilox roller, wherein the coating amount is 8g of wet glue per square meter (about 3g of dry glue per square meter), and drying by using an oven to obtain a semi-finished product; and then, overlapping and coating a second layer of milky white coating, wherein the gluing amount is 20g of wet glue per square meter (about 2g of dry glue per square meter), and drying to obtain the APET transparent easy-to-uncover film finished product.
(1) The heat seal strengths of the clear easy-release lidding film sheets of APET at different temperatures were tested and the test results are shown in table 1: heat seal strength test tables for the transparent easy release cover films of example 1 at different temperatures.
The test conditions were that the heat sealing knife was heated at the side of the cover film, the sealing pressure was 2kgf, and the pressing time was 1 second.
Table 1: heat seal Strength test Table for transparent easy-open cover film of example 1 at different temperatures
Figure BDA0002493120730000041
(2) The sample strips heat-sealed at 140 ℃ are placed in an aging box with the temperature and humidity conditions of 30 ℃ and 95% RH for 48h and then tested, and the sealing strength is 5.2N/15 mm.
For comparison, the thus-obtained 23 μm-thick transparent polyester film was coated with 20 μm-thick EVA sample PET23/EVA20, and the heat-seal strength at 140 ℃ was 10.6N/15mm, and the film was allowed to stand in an aging oven at 30 ℃ and 95% RH for 48 hours and then tested to peel off.
The clear release film of APET from example 1, the clear polyester film (23 μm thick), and the PET23/EVA20 extrusion film were subjected to film transmittance and haze tests, respectively, and the test results are shown in table 2.
TABLE 2 light transmittance and haze test charts for different transparent polyester film samples
Sample (I) Light transmittance (%) Haze (%)
Transparent polyester film (23 μm thick) 88 2
APET transparent easy-to-tear cover film(example 1) 85 4
PET23/EVA20 extrusion coating film 75 22
As can be seen from table 2, the clear release film of APET of example 1 had a higher light transmission than the PET23/EVA20 extrusion film, and a lower haze value.
Example 2
A transparent easy-release lidding film heat-sealed to an APET tray comprises a polyester film having a thickness of 19 μm and a heat-seal coating applied to the polyester film. Wherein the heat seal coating is obtained by coating two layers.
The first layer of coating is 100 parts by weight of polyethyleneimine solution (solid content is 5%), and the polyethyleneimine solution is transparent clear solution and has a number average molecular weight of 2000.
The second layer of coating comprises the following components in parts by weight:
copolyester A18 parts
Copolyester B82 parts
Polyethylene wax powder as opening agent 1.5 weight portions
0.5 part of organosilicon slipping agent
250 portions of ethyl acetate
50 parts of butyl acetate;
wherein the glass transition temperature of the copolyester A is-21 ℃, the number average molecular weight is 30000, and the acid value is 5; the glass transition temperature of copolyester B was 48 ℃, the number average molecular weight was 15000, and the hydroxyl number was 2. The milky white coating is obtained according to the weight parts, and the solid content of the coating is about 25 percent.
The transparent easy-to-uncover cover film thermally sealed with the APET tray has the specific preparation method that: coating a first layer of coating on a transparent polyester film with the thickness of 19 mu m by using a anilox roller, wherein the coating amount is 4g of wet glue per square meter (about 0.2g of dry glue per square meter), and drying by using an oven to obtain a semi-finished product; and then, overlapping and coating a second layer of coating, wherein the gluing amount is 8g of wet glue per square meter (about 2g of dry glue per square meter), and drying to obtain a finished product of the APET transparent easy-to-uncover film.
(1) The clear easy release lidding film sheets of APET were tested for heat seal strength at different temperatures and the test results are shown in table 3: heat seal strength test tables for the transparent easy release cover films of example 2 at different temperatures.
The test conditions were that the heat sealing knife was heated at the side of the cover film, the sealing pressure was 2kgf, and the pressing time was 1 second.
Table 3: example 2 Heat seal Strength test Table of transparent easy-open cover film at different temperatures
Figure BDA0002493120730000061
(2) The sample strips heat-sealed at 140 ℃ are placed in an aging box with the temperature and humidity conditions of 30 ℃ and 95% RH for 48h and then tested, and the sealing strength is 5.0N/15 mm.
The clear release film of APET of example 2 and the clear polyester film (19 μm thick) were subjected to film transmittance and haze measurements, respectively, and the results are shown in table 4.
TABLE 4 light transmittance and haze test charts for different transparent polyester film samples
Sample (I) Light transmittance (%) Haze (%)
Transparent polyester film (23 μm thick) 88 2
APET transparent easy-to-open cover film (example 1) 85 4
As can be seen from table 4, the clear release film of APET of example 2 had a light transmission similar to that of the 23 μm thick clear polyester film and the haze value increased from 2% to 4%.
Example 3
A transparent easy-release lidding film heat-sealed to an APET tray comprises a polyester film having a thickness of 35 μm and a heat-seal coating applied to the polyester film. Wherein the heat seal coating is formed by coating two layers in a superposed manner.
The first layer of coating is 100 parts by weight of polyethyleneimine (solid content is 5%), and the polyethyleneimine solution is a transparent clear solution and has a number average molecular weight of 3000.
The second layer of coating comprises the following components in parts by weight:
copolyester A25 parts
Copolyester B75 parts
Polyethylene wax powder as opening agent 1.5 weight portions
0.5 part of organosilicon slipping agent
1000 parts of ethyl acetate
150 parts of butyl acetate;
wherein the glass transition temperature of the copolyester A is-21 ℃, the number average molecular weight is 30000, and the acid value is 5; the glass transition temperature of copolyester B was 48 ℃, the number average molecular weight was 15000, and the hydroxyl number was 2. The milky white coating is obtained according to the weight parts, and the solid content of the coating is about 8 percent.
The transparent easy-to-uncover cover film thermally sealed with the APET tray has the specific preparation method that: coating a first layer of coating on a transparent polyester film with the thickness of 35 mu m by using a anilox roller, wherein the coating amount is 4g of wet glue per square meter (about 0.2g of dry glue per square meter), and drying by using an oven to obtain a semi-finished product; and then, overlapping and coating a second layer of coating, wherein the gluing amount is 25g of wet glue per square meter (dry glue is about 2g per square meter), and drying to obtain a finished product of the APET transparent easy-to-uncover film.
(1) The clear easy release lidding film sheets of APET were tested for heat seal strength at different temperatures and the test results are shown in table 5: heat seal strength test tables for the transparent easy release cover films of example 3 at different temperatures.
The test conditions were that the heat sealing knife was heated at the side of the cover film, the sealing pressure was 2kgf, and the pressing time was 1 second.
Table 5: heat seal Strength test Table for transparent easy-open cover film of example 3 at different temperatures
Figure BDA0002493120730000081
(2) The sample strips heat-sealed at 140 ℃ are placed in an aging box with the temperature and humidity conditions of 30 ℃ and 95% RH for 48h and then tested, and the sealing strength is 5.1N/15 mm.
The transparent easy-release film of APET of example 3 and a transparent polyester film (35 μm thick) were subjected to film transmittance and haze tests, respectively, and the test results are shown in table 6.
TABLE 6 light transmittance and haze test charts for different transparent polyester film samples
Sample (I) Light transmittance (%) Haze (%)
Transparent polyester film (35 μm thick) 88 1.9
APET transparent easy-to-open cover film (example 3) 85 4.9
As can be seen from table 6, the clear release film of APET of example 3 had a light transmission similar to that of the 35 μm thick clear polyester film and the haze value increased from 1.9% to 4.9%.
Example 4
A transparent easy-open cover film heat-sealed with APET tray comprises a polyester film with a thickness of 50 μm and a heat-sealing coating coated on the polyester film. Wherein, the heat seal coating is obtained by one-time coating.
The coating comprises the following components in parts by weight:
copolyester A25 parts
70 portions of copolyester B
Polyurethane C5 parts
Polyethylene wax powder as opening agent 1.0 part
0.5 part of organosilicon slipping agent
350 parts of ethyl acetate
50 parts of butyl acetate;
wherein the glass transition temperature of the copolyester A is-21 ℃, the number average molecular weight is 30000, and the hydroxyl value is 5; the glass transition temperature of the copolyester B is 48 ℃, the number average molecular weight is 15000, and the hydroxyl value is 2; the glass transition temperature of the copolyurethane C was 25 ℃ and the number average molecular weight was 6000. The milky white coating is obtained according to the weight parts, and the solid content of the coating is about 20 percent.
The transparent easy-to-uncover cover film thermally sealed with the APET tray has the specific preparation method that: coating the coating on a transparent polyester film with the thickness of 50 mu m by using a anilox roller, wherein the coating amount is 30g of wet glue per square meter (dry glue is about 6g per square meter), and drying by using an oven to obtain a finished product of the APET transparent easy-to-uncover cover film.
(1) The clear easy release lidding film sheets of APET were tested for heat seal strength at different temperatures and the test results are shown in table 7: heat seal strength test tables for the transparent easy release cover films of example 4 at different temperatures.
The test conditions were that the heat sealing knife was heated at the side of the cover film, the sealing pressure was 2kgf, and the pressing time was 1 second.
Table 7: heat seal Strength test Table for transparent easy-open cover film of example 4 at different temperatures
Figure BDA0002493120730000091
(2) The sample strips heat-sealed at 160 ℃ are placed in an aging box with the temperature and humidity conditions of 30 ℃ and 95% RH for 48h and then tested, and the sealing strength is 12.1N/15 mm.
The transparent easy-open cover film of APET of example 4 and a transparent polyester film (50 μm thick) were subjected to film transmittance and haze tests, respectively, and the test results are shown in table 8.
TABLE 8 test chart for transmittance and haze of different transparent polyester film samples
Sample (I) Light transmittance (%) Haze (%)
Transparent polyester film (50 μm thick) 88 3.1
APET transparent easy-to-open cover film (example 4) 85 4.9
As can be seen from table 8, the clear release film of APET of example 4 had a light transmission similar to that of a clear polyester film 50 μm thick and the haze value increased from 3.1% to 4.9%.
Example 5
A transparent easy-open cover film heat-sealed with APET tray comprises a polyester film with a thickness of 50 μm and a heat-sealing coating coated on the polyester film. Wherein, the heat seal coating is obtained by one-time coating.
The coating comprises the following components in parts by weight:
copolyester A85 parts
10 portions of acrylic ester resin B
Polyurethane C5 parts
Polyethylene wax powder as opening agent 1.0 part
0.5 part of organosilicon slipping agent
350 parts of ethyl acetate
50 parts of butyl acetate;
wherein the glass transition temperature of the copolyester A is 24 ℃, the number average molecular weight is 30000, and the hydroxyl value is 5; the glass transition temperature of the acrylate resin B is 48 ℃, and the number average molecular weight is 10000; the glass transition temperature of polyurethane C was 25 ℃ and the number average molecular weight was 6000. The milky white coating is obtained according to the weight parts, and the solid content of the coating is about 20 percent.
The transparent easy-to-uncover cover film thermally sealed with the APET tray has the specific preparation method that: coating the coating on a transparent polyester film with the thickness of 50 mu m by using a anilox roller, wherein the coating amount is 30g of wet glue per square meter (dry glue is about 6g per square meter), and drying by using an oven to obtain a finished product of the APET transparent easy-to-uncover cover film.
(1) The clear easy release lidding film sheets of APET were tested for heat seal strength at different temperatures and the test results are shown in table 9: heat seal strength test tables for the transparent easy release cover films of example 5 at different temperatures.
The test conditions were that the heat sealing knife was heated at the side of the cover film, the sealing pressure was 2kgf, and the pressing time was 1 second.
Table 9: heat seal Strength test Table for transparent easy-open cover film of example 5 at different temperatures
Figure BDA0002493120730000111
(2) The sample strips heat-sealed at 180 ℃ are placed in an aging box with the temperature and humidity conditions of 30 ℃ and 95% RH for 48h and then tested, and the sealing strength is 18.4N/15 mm. .
The transparent easy release film of APET of example 5 and a transparent polyester film (50 μm thick) were subjected to film transmittance and haze tests, respectively, and the test results are shown in table 10.
TABLE 10 measurement of light transmittance and haze of various transparent polyester film samples
Sample (I) Light transmittance (%) Haze (%)
Transparent polyester film (50 μm thick) 88 3.1
APET transparent easy-to-open cover film (example 5) 86 4.0
As can be seen from table 10, the clear release film of APET of example 5 had a light transmission similar to that of a clear polyester film 50 μm thick and the haze value increased from 3.1% to 4.0%.
The transparent easy-to-tear film provided in embodiments 1 to 5 and heat-sealed with an APET tray is prepared by applying a heat-seal adhesive coating to a substrate in a solution coating manner, and has the advantages of high transparency, low odor and reliable sealing.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (6)

1. The transparent easy-to-uncover cover film thermally sealed with the APET tray is characterized by comprising a base material and a heat-seal coating coated on the base material, wherein the heat-seal coating is obtained by drying a heat-seal adhesive coating after coating;
the base material is one of PET, PC, NY, BOPP, CPP or PE;
the heat-seal adhesive coating comprises the following components in parts by weight: 100 portions of resin, 0 to 10 portions of additive and 200 portions of solvent are 1150 portions;
the thickness of the heat-seal coating is 0.5-15 μm.
2. The transparent easy release cover film according to claim 1, wherein the resin comprises at least one of acrylic resin, acrylic ester resin, methacrylic acid resin, methacrylic ester resin, polyester, copolyester resin, polyvinyl acetate and its copolymer, polyethylene and its copolymer, polyvinyl chloride and its copolymer, polypropylene and its copolymer, chlorinated polypropylene and its copolymer, polystyrene and its copolymer, polyurethane and its copolymer, polyamide and its copolymer, polyether and its copolymer, amino resin and its copolymer, polyethyleneimine and its copolymer, silicone resin, modified cellulose, polyvinylidene chloride and its copolymer, polyvinylidene fluoride and its copolymer.
3. The transparent easy release film according to claim 1, wherein the solvent is a low boiling point solvent comprising at least one of ethanol, ethyl acetate, propyl acetate, butyl acetate, isopropyl alcohol, n-propanol, butanol, isobutyl alcohol, n-hexane, heptane, isooctane, methyl ethyl ketone.
4. The transparent easy release cover film according to claim 1, wherein the heat seal coating has a coating thickness in the substrate of 1-12 μm.
5. The transparent easy-release cover film according to claim 4, wherein the heat-seal coating layer is coated on the substrate in a single coating or multiple coating layers.
6. The transparent easy release film according to claim 1, wherein the heat seal strength of the transparent easy release film to APET is 2 to 25N/15 mm.
CN202010410751.6A 2020-05-15 2020-05-15 Transparent easy-to-tear cover film thermally sealed with APET tray Pending CN111548521A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113025229A (en) * 2021-04-09 2021-06-25 惠州宝柏包装有限公司 Heat-curable adhesive film
CN113801357A (en) * 2021-09-17 2021-12-17 海南赛诺实业有限公司 A kind of PP easy-release film and preparation method thereof
CN114801401A (en) * 2022-03-23 2022-07-29 毕玛时软包装（苏州）有限公司 Clean easy-to-open cover film for liquid packaging

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106459456A (en) * 2014-03-26 2017-02-22 波士胶股份有限公司 Solvent-based low temperature heat seal coating
US20190030874A1 (en) * 2017-07-31 2019-01-31 Mitsubishi Polyester Film Gmbh Peelable polyester film, use thereof and process for production thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106459456A (en) * 2014-03-26 2017-02-22 波士胶股份有限公司 Solvent-based low temperature heat seal coating
US20190030874A1 (en) * 2017-07-31 2019-01-31 Mitsubishi Polyester Film Gmbh Peelable polyester film, use thereof and process for production thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113025229A (en) * 2021-04-09 2021-06-25 惠州宝柏包装有限公司 Heat-curable adhesive film
CN113801357A (en) * 2021-09-17 2021-12-17 海南赛诺实业有限公司 A kind of PP easy-release film and preparation method thereof
CN114801401A (en) * 2022-03-23 2022-07-29 毕玛时软包装（苏州）有限公司 Clean easy-to-open cover film for liquid packaging

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