CN114734706A - Heat-sealing film, preparation method thereof and application thereof in food packaging - Google Patents

Heat-sealing film, preparation method thereof and application thereof in food packaging Download PDF

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CN114734706A
CN114734706A CN202210430054.6A CN202210430054A CN114734706A CN 114734706 A CN114734706 A CN 114734706A CN 202210430054 A CN202210430054 A CN 202210430054A CN 114734706 A CN114734706 A CN 114734706A
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heat
layer
thickness
sealing
film
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CN114734706B (en
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欧晓玲
吴思
邱晓霞
莫伟强
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Shenzhen Porshealth Bioengineering Co ltd
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Shenzhen Porshealth Bioengineering Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/085—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/09—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • 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
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • 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
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene
    • 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
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging

Abstract

The invention provides a heat sealing film, a preparation method thereof and application thereof in food packaging, belonging to the technical field of packaging materials. The heat-sealing film comprises a three-layer structure which comprises an outer surface layer, a core layer and a heat-sealing layer in sequence, wherein the thickness of the heat-sealing film is 64-128 mu m; the heat-sealing film is prepared by using the PET/Al/PP + PE copolymer as a raw material, wherein the PP and the PE copolymer have the advantages of PE and PP at the same time, have high strength, high toughness and temperature resistance, are more suitable for the packaging mode, have low heat-sealing temperature and good sealing performance, and can well guarantee the maintenance of the activity of probiotics; the invention obviously improves the long-term activity of the probiotics in the probiotic product by controlling the thickness of each layer, and is more beneficial to the storage of the probiotic product.

Description

Heat-sealing film, preparation method thereof and application thereof in food packaging
Technical Field
The invention relates to the technical field of packaging materials, in particular to a heat sealing film, a preparation method thereof and application thereof in food packaging.
Background
At present, people increasingly recognize that probiotics play a key role in human health, and the probiotics are active microorganisms which are beneficial to a host and change the flora composition of a certain part of the host through colonization in the human body. The health of the intestinal tract is kept by promoting the absorption of nutrients by regulating the immune function of the host mucous membrane and the system or by regulating the balance of flora in the intestinal tract, so that single microorganisms or mixed microorganisms with definite compositions which are beneficial to the health are generated. With the increasing widespread application field of probiotics, the probiotics are applied to products in various dosage forms, such as powder, granules, capsules, liquid milk, beverages, tablets, oral liquid and the like, and oral ingestion is the most common method for supplementing probiotics at present. However, probiotics suffer loss of activity during the manufacturing process, during storage and during consumption.
The probiotics powder product in the market at present mainly uses the strip bag, and the mode of strip bag packing has some not enoughly, and when the consumer took, the strip bag packing was difficult for tearing, and it is not convenient to tear the back strip bag breach for the small time of taking. The easy-to-tear opening is the tearing difficulty of the sawtooth shape, the notch is incomplete, the powder is not easy to pour out, the package of the fillet solves the tearing difficulty, but the notch is too small after the tearing, and the easy-to-tear opening is not convenient to take.
Therefore, a probiotic product package convenient for consumers is needed, and Chinese patent application 200910128371.7 discloses a packaging film for cold drink and a preparation method thereof, wherein the packaging film comprises a printing protective layer and a heat-sealing layer composite film, the heat-sealing material comprises PP and color master, the color master accounts for 8-10% of the total weight of the heat-sealing layer material, and the PP accounts for 90-92% of the total weight of the heat-sealing layer material; the product of the invention can reach the printing level and the use effect of the original pearly-luster OPP, is superior to the effect of the pearly-luster OPP, has low cost and better meets the requirement of environmental protection.
Chinese patent application 201911409830.9 discloses an easy heat seal easily opens PE film for food package for form the closing cap membrane together with the printing layer, then with the middle food package cavity that forms behind the basement membrane heat seal, PE film forms the banding with the die block heat seal, the basement membrane is crowded tensile film altogether, the printing layer is PET membrane or MOPP membrane, the PE film contains compound corona layer, intermediate level and inlayer in proper order, corona layer, intermediate level and inlayer are crowded altogether and are formed. The PE film is used for packaging food together with the printing layer and the bottom die, the three-layer layered structure of the PE film supports each other, so that the PE film is moderate in heat sealing strength and easy to uncover, the opening is very neat, the falling resistance can meet the requirement, people can easily uncover the easy-to-uncover packaging bag without auxiliary tools such as scissors, the opening can be ensured to be complete and attractive, the PE film is extremely high in practicability, has huge economic benefits, and is worthy of popularization.
However, since the probiotic products have certain requirements on activity, it is necessary to develop a heat-sealing film which can help to maintain the activity of the probiotics during the shelf life and a preparation method thereof.
Disclosure of Invention
Based on the problems in the prior art, the invention provides a heat sealing film, a preparation method thereof and application thereof in food packaging.
In order to achieve the purpose, the invention provides a heat-sealing film, the thickness of the heat-sealing film is 64-128 μm, the heat-sealing film comprises a three-layer structure, namely an outer surface layer, a core layer and a heat-sealing layer in sequence;
the outer layer is made of polyethylene terephthalate for packaging, and is purchased from Dupont Hongji film Co., Ltd, model number KLBD;
the core layer is made of aluminum, and is purchased from Hangzhou five-star aluminum industry Co., Ltd, model 8011;
the heat-sealing film is a mixture of polypropylene and polyethylene, and is a PE-T heat-sealing peelable easy-to-tear film purchased from Jiangyin Tongli photoelectric technology Limited;
the existing heat-sealing film is commonly a PET/Al/PE composite film, the sealing temperature is high, the heat-sealing film and a PP bottle contact heat-sealing material are PE, the PE has the characteristics of excellent electrical insulation, chemical resistance, low temperature resistance, good processing fluidity and the like, but the heat resistance, the atmospheric aging resistance and the stress cracking are easy to occur, so that the defects of poor sealing and reduced air moisture barrier property can be caused in the production and packaging processes, and the product is not stored properly. The composite heat-sealing film is improved, namely the heat-sealing film is obtained by compounding the PET, Al and PP + PE with specific types as raw materials, the obtained heat-sealing film has high strength, high toughness and temperature resistance, is more suitable for the packaging mode, has low heat-sealing temperature and good sealing performance, and well guarantees the activity of probiotics.
In other preferred embodiments, the outer surface layer has a thickness of 4 to 8 μm; the core layer is 40-60 μm; the thickness of the heat sealing layer is 20-60 μm;
preferably, the thickness of the outer surface layer is 5-7 μm; the core layer is 45-55 μm; the thickness of the heat sealing layer is 30-60 μm;
still more preferably, said outer skin has a thickness of 6 μm; the core layer is 50 μm; the thickness of the heat sealing layer is 30 μm;
or, the thickness of the outer surface layer is 6 μm; the core layer is 50 μm; the thickness of the heat sealing layer is 60 mu m.
The invention obviously improves the long-term activity of the probiotics in the probiotic product by controlling the thickness of each layer, and is more beneficial to the storage of the probiotic product.
The heat sealing temperature of the heat sealing film is above 175 ℃.
The invention also provides a preparation method of the heat sealing film, which comprises the following steps:
the outer surface layer, the core layer and the heat sealing layer with specific thicknesses are taken to be prepared into the heat sealing film packaging material through product inspection, compounding, curing, slitting and die cutting.
The compounding temperature is 60-70 ℃;
the curing temperature is 30-40 ℃ and the curing time is 45-48 hours.
The outer surface layer and the heat sealing layer are both prepared into films with corresponding thickness by a conventional method.
The invention also provides application of the heat-seal film packaging material in food packaging.
The food product may be a probiotic product.
Has the advantages that:
(1) the heat-sealing film is prepared by taking the PET/Al/PP + PE copolymer as a raw material, wherein the PP and the PE copolymer have the advantages of PE and PP simultaneously and are compounded with PET and Al, and the thicknesses of the three films are controlled, so that the obtained heat-sealing film has high strength, high toughness and temperature resistance, is more suitable for the packaging mode, has low heat-sealing temperature and good sealing performance, and well guarantees the activity of probiotics;
(2) the heat sealing film provided by the invention can realize heat sealing at a lower temperature, and the heat sealing temperature is above 175 ℃; the heat sealing temperature of the traditional PET/AL/PE composite film is more than 190 ℃;
(3) the invention obviously improves the long-term activity of the probiotics in the probiotic product by controlling the thickness of each layer, and is more beneficial to the storage of the probiotic product.
Drawings
FIG. 1 is a schematic view of the structure of a heat-sealable film prepared in example 2.
Detailed Description
Example 1A Heat-sealable film and method of making the same
The thickness of the heat sealing film is 86 μm, and the heat sealing film comprises a three-layer structure which is sequentially an outer surface layer, a core layer and a heat sealing layer.
The thickness of the outer surface layer is 6 μm; the thickness of the core layer is 50 μm; the thickness of the heat sealing layer is 30 μm;
the outer layer raw material is polyethylene terephthalate, model KLBD;
the core layer is made of aluminum with the model number of 8011;
the heat sealing film is a PE-T heat sealing peelable easy-to-tear film;
the preparation method comprises the following steps:
the outer surface layer, the core layer and the heat sealing layer with specific thicknesses are taken to be prepared into the heat sealing film packaging material through product inspection, compounding, curing, slitting and die cutting.
The compounding temperature is 60 ℃;
the curing temperature is 30 ℃ and the curing time is 48 hours.
Example 2 Heat-sealing film and method for producing the same
The thickness of the heat sealing film is 116 μm, and the heat sealing film comprises a three-layer structure which is sequentially an outer surface layer, a printing layer, a core layer and a heat sealing layer.
The thickness of the outer surface layer is 6 μm; the thickness of the core layer is 50 μm; the thickness of the heat sealing layer is 60 mu m;
the outer layer raw material is polyethylene terephthalate, model KLBD;
the core layer is made of aluminum with the model number of 8011;
the heat sealing film is a PE-T heat sealing peelable easy-to-tear film;
the preparation method comprises the following steps:
the outer surface layer, the core layer and the heat sealing layer with specific thicknesses are taken to be prepared into the heat sealing film packaging material through product inspection, compounding, curing, slitting and die cutting.
The compounding temperature is 70 ℃;
the curing temperature is 40 ℃ and the curing time is 45 hours.
Comparative example 1 Heat-sealing film and method for producing the same
The difference from example 2 is that: the heat sealing layer only adopts polyethylene, and the model is PE environmental protection film; purchased from Hualong film materials GmbH, Jiangmen.
Comparative example 2
The difference from example 2 is that: the heat-sealing layer is a low-temperature heat-sealing film which is purchased from Hubei Hui Shi plastic industry GmbH and has the model number of SCPP.
Comparative example 3
The difference from example 2 is that: the thicknesses of the layers are different:
the thickness of the outer surface layer is 6 μm; the thickness of the core layer is 50 μm; the thickness of the heat sealing layer is 80 μm.
Comparative example 4 Heat-sealing film and method for producing the same
A multilayer heat shrinkable film disclosed in prior art CN106113858A example 2 was used as the heat seal film.
Test examples
1. Experimental equipment:
LX-MFY-01 seal tester, available from Issori instruments science and technology, Guangdong;
a full-automatic canning sealing and capping machine purchased from machinery Limited next in Jiangsu Shen;
LRH-250-S constant temperature and humidity incubator purchased from Taihong medical instruments, Inc., Shaoguan;
water activity meters were purchased from Min measuring instruments (Xiamen) Ltd.
In the experimental process, the packaging form of the probiotic product is PP bottle and heat sealing film; the thickness of the PP bottle body is 2.0-2.5 mm.
2. The experimental steps are as follows:
2.1. preparation of probiotic powder
Pulverizing sugar alcohol (one or more of lactitol, erythritol, maltitol, sorbitol, and isomalt), sieving with 60 mesh sieve, and weighing according to formula dosage; weighing prebiotics (one or more than two of fructo-oligosaccharide, galacto-oligosaccharide, polydextrose, isomalto-oligosaccharide, inulin, stachyose, xylo-oligosaccharide, etc.) in the formula according to formula dosage for use. One or more of food lactobacillus powder (bifidobacterium adolescentis, bifidobacterium animalis (bifidobacterium lactis), bifidobacterium bifidum, bifidobacterium breve, bifidobacterium infantis, bifidobacterium longum, lactobacillus acidophilus, lactobacillus casei, lactobacillus crispatus, lactobacillus delbrueckii subspecies bulgaricus (lactobacillus bulgaricus), lactobacillus delbrueckii subspecies lactis, lactobacillus fermentum, lactobacillus gasseri, lactobacillus helveticus, lactobacillus johnsonii, lactobacillus paracasei, lactobacillus plantarum, lactobacillus reuteri, lactobacillus rhamnosus, lactobacillus salivarius, streptococcus thermophilus, propionibacterium freudenreichii subspecies, lactobacillus lactis cremoris and lactobacillus lactis diacetyl subspecies, leuconostoc mesenteroides, pediococcus acidilae, pediococcus pentosaceus and bacillus coagulans) are weighed according to the formula amount for standby.
Firstly, mixing lactobacillus powder (lactobacillus acidophilus, bifidobacterium lactis, lactobacillus plantarum and lactobacillus paracasei) used in the formula for 5 minutes, then adding sugar alcohol (lactitol and xylitol) with the same amount for mixing for 5 minutes, and finally, totally mixing the premix material and other materials used in the formula for 30 minutes.
2.2. Bottling and subpackaging
Debugging a full-automatic canning sealing and capping machine, adding the prepared probiotic powder into a hopper, adjusting the packaging amount, and packaging different heat-sealing films.
3. Tightness test and packaging effect test
The samples were randomly sampled, 60 bottles of samples were taken, and the packaging samples were tested for sealing effectiveness in an LX-MFY-01 seal tester and the data recorded. Randomly sampling 10 bottles, recording the opening effect of the heat sealing film, and recording data.
4. Probiotic activity study
And (4) taking the packaged complete sample, and placing the sample in a constant temperature and humidity incubator, wherein the temperature is set to be 25 ℃, and the humidity is set to be 60% RH. And respectively detecting the survival number of the lactic acid bacteria and the water activity of the probiotic powder of different heat-sealing film probiotics.
The results of the measurements are shown in Table 1 below:
TABLE 1
Figure BDA0003609833700000061
Figure BDA0003609833700000071
According to the detection data in the table 1, the heat-sealing film prepared by the embodiment 1-2 of the invention is used for heat-sealing probiotic products, the heat-sealing temperature is low, the heat-sealing can be completed under the condition of 175-180 ℃, the heat-sealed samples are not breathable, the number of the lactic acid bacteria of the probiotic products is high after the probiotic products are placed for 18 months for a long time, the water activity is low, the long-term activity of the probiotics in the probiotic products is effectively protected, and the long-term stability of the probiotic products is ensured; in the comparative examples 1-2, the material of the heat sealing layer is changed, and in the comparative example 3, the thickness ratio of three layers of raw materials in the heat sealing film is changed, so that the heat sealing temperature is increased, the obtained heat sealing film is used for heat sealing a probiotic product, and the activity of probiotics is obviously reduced after the product is placed for 18 months, thereby affecting the eating. In comparative example 4, the heat-sealing film disclosed in the prior art was used for probiotic food preservation, and the stability of probiotics was significantly reduced. In addition, the packaging mode of the packaging material provided by the invention improves the taking convenience of the probiotic powder.
While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The heat-sealing film comprises a three-layer structure, and is sequentially provided with an outer surface layer, a core layer and a heat-sealing layer, and is characterized in that: the thickness of the heat sealing film is 64-128 μm,
the outer surface layer is made of polyethylene glycol terephthalate for packaging;
the core layer is made of aluminum;
the heat sealing film is a mixture of polypropylene and polyethylene.
2. The heat-sealable film according to claim 1, wherein: the polyethylene terephthalate for packaging is purchased from DuPont hongji film Co., Ltd, model number KLBD;
the aluminum is purchased from Hangzhou five-star aluminum industry Co., Ltd, model 8011;
the mixture of polypropylene and polyethylene is a PE-T heat-seal peelable easy-to-tear film purchased from Jiangyin Tongli photoelectric technology limited.
3. The heat-sealable film according to claim 1, wherein: the thickness of the outer surface layer is 4-8 μm; the core layer is 40-60 μm; the thickness of the heat sealing layer is 20-60 μm.
4. The heat-sealable film according to claim 4, wherein: the thickness of the outer surface layer is 5-7 μm; the core layer is 45-55 μm; the thickness of the heat sealing layer is 30-60 μm.
5. The heat-sealable film according to claim 5, wherein: the thickness of the outer surface layer is 6 μm; the core layer is 50 μm; the thickness of the heat sealing layer is 30 μm.
6. The heat-sealable film according to claim 6, wherein: the thickness of the outer surface layer is 6 μm; the core layer is 50 μm; the thickness of the heat sealing layer is 60 mu m.
7. The method of producing a heat-sealable film packaging material as set forth in any one of claims 1 to 6, wherein: the method comprises the following steps:
the outer surface layer, the core layer and the heat sealing layer with specific thicknesses are taken to be prepared into the heat sealing film packaging material through product inspection, compounding, curing, slitting and die cutting.
8. The method of claim 7, wherein: the compounding temperature is 60-70 ℃; the curing temperature is 30-40 ℃ and the curing time is 45-48 hours.
9. Use of a heat-sealable film packaging material according to any of claims 1 to 6 in food packaging.
10. Use according to claim 9, characterized in that: the food is a probiotic product.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08143724A (en) * 1994-11-17 1996-06-04 Dainippon Printing Co Ltd Film and laminate for food packaging
CN102248735A (en) * 2011-05-18 2011-11-23 浙江众成包装材料股份有限公司 Polyolefin film used for packaging and preparation method thereof
CN103192570A (en) * 2013-04-19 2013-07-10 黄山永新股份有限公司 High-resistance steam resistant packaging film convenient for direct microwave heating and preparation method thereof
CN108099303A (en) * 2017-11-28 2018-06-01 江阴宝柏包装有限公司 A kind of thermophilic digestion easily takes off composite membrane and its manufacturing method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08143724A (en) * 1994-11-17 1996-06-04 Dainippon Printing Co Ltd Film and laminate for food packaging
CN102248735A (en) * 2011-05-18 2011-11-23 浙江众成包装材料股份有限公司 Polyolefin film used for packaging and preparation method thereof
CN103192570A (en) * 2013-04-19 2013-07-10 黄山永新股份有限公司 High-resistance steam resistant packaging film convenient for direct microwave heating and preparation method thereof
CN108099303A (en) * 2017-11-28 2018-06-01 江阴宝柏包装有限公司 A kind of thermophilic digestion easily takes off composite membrane and its manufacturing method

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