CN114734706B - 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 PDFInfo
- Publication number
- CN114734706B CN114734706B CN202210430054.6A CN202210430054A CN114734706B CN 114734706 B CN114734706 B CN 114734706B CN 202210430054 A CN202210430054 A CN 202210430054A CN 114734706 B CN114734706 B CN 114734706B
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- China
- Prior art keywords
- heat
- layer
- thickness
- film
- sealing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 235000018291 probiotics Nutrition 0.000 claims abstract description 43
- 239000012793 heat-sealing layer Substances 0.000 claims abstract description 26
- 239000010410 layer Substances 0.000 claims abstract description 26
- 239000012792 core layer Substances 0.000 claims abstract description 23
- 239000002344 surface layer Substances 0.000 claims abstract description 20
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Classifications
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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
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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
- 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
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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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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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
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- 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
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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
- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/31—Heat sealable
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- C—CHEMISTRY; METALLURGY
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- 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
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- 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
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Abstract
The invention provides a heat-sealing film, a preparation method thereof and application thereof in food packaging, and belongs to the technical field of packaging materials. The heat-sealing film comprises a three-layer structure, namely an outer surface layer, a core layer and a heat-sealing layer, wherein the thickness of the heat-sealing film is 64-128 mu m; the invention adopts the PET/Al/PP+PE copolymer as the raw material to prepare the heat-sealing film, wherein the PP and PE copolymer have the advantages of PE and PP at the same time, and the 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 has good guarantee on the survival of probiotics; the invention obviously improves the long-term activity of probiotics in the probiotic products by controlling the thickness of each layer, and is more beneficial to the storage of the probiotic products.
Description
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, probiotics are increasingly recognized as a type of active microorganism beneficial to a host by colonizing the human body and altering the flora composition of a part of the host. By regulating the immune function of host mucous membrane and system or regulating the balance of flora in intestinal tract, the effect of promoting nutrient absorption and maintaining intestinal health is achieved, so that single microorganism or mixed microorganism with definite composition beneficial to health is produced. With the increasing wide application of probiotics, the probiotics are applied to various dosage forms of products, such as powder, granules, electuary, capsules, liquid milk, beverage, tablets, oral liquid and the like, and oral ingestion is the most common method for supplementing probiotics at present. But the probiotics can cause the loss of activity during the production process, the storage process and the taking process.
At present, most of the probiotic powder products in the market are mainly in strip bags, and the strip bag packaging mode has some defects, so that the strip bag packaging is not easy to tear when a consumer takes the probiotic powder products, and the strip bag is small in notch and inconvenient to take after the consumer takes the probiotic powder products. The easy tearing mouth is saw-tooth-shaped and is difficult to tear, the notch is incomplete, the powder is difficult to pour out, the packaging with rounded corners solves the problem of difficult tearing, but the notch is too small after tearing, and the taking is inconvenient.
Therefore, there is a need for a packaging of probiotic products for consumer use, chinese patent application 200910128371.7 discloses a packaging film for cold drink and a method for preparing the same, the packaging film comprising a composite film of a printed protective layer and a heat sealing layer, the heat sealing material comprising PP and a color masterbatch, wherein the color masterbatch comprises 8-10% of the total weight of the heat sealing layer material and PP comprises 90-92% of the total weight of the heat sealing layer material, and the method for preparing the packaging film; the product of the invention can achieve the printing level and the using effect of the original pearlescent OPP, is better than the effect of the pearlescent OPP, has low cost and meets the environmental protection requirement.
The Chinese patent application 201911409830.9 discloses a PE film for food packaging, which is easy to heat seal and easy to uncover, and is used for forming a cover film together with a printing layer, then forming a food packaging cavity in the middle of the cover film after being heat-sealed with a bottom film, wherein the PE film and the bottom die are heat-sealed to form an edge sealing, the bottom film is a co-extrusion stretching film, the printing layer is a PET film or a MOPP film, and the PE film comprises a corona layer, a middle layer and an inner layer which are sequentially compounded, and the corona layer, the middle layer and the inner layer are formed by co-extrusion. The PE film is used for being used for food packaging together with the printing layer and the bottom die, and the three layers of the PE film are mutually supported, so that the PE film has moderate heat sealing strength, is easy to uncover, has very regular openings, can meet the requirements on drop resistance, can be uncovered easily by people without auxiliary tools such as scissors when being used for easily uncovering the packaging bag, can ensure the integrity and the beauty of the openings, has extremely strong practicability, has huge economic benefit, and is worthy of popularization.
However, since probiotic products have certain requirements for activity, there is a need to develop a heat sealable film that helps to maintain the activity of the probiotic during the shelf life and a method of making the same.
Disclosure of Invention
Based on the problems existing in the prior art, the invention provides a heat sealing film, a preparation method thereof and application thereof in food packaging, and the use of the heat sealing film to package probiotic products can effectively ensure the activity of probiotics in the products.
In order to achieve the aim, the invention provides a heat-sealing film, the thickness of which is 64-128 mu m, which comprises a three-layer structure, namely an outer surface layer, a core layer and a heat-sealing layer in sequence;
the outer layer raw material is polyethylene terephthalate for packaging, which is purchased from Dupont Hongkin film Co., ltd., model 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 removable film purchased from Jiangyin Tongli photoelectric technology Co., ltd;
the conventional heat sealing film is a PET/Al/PE composite film, the sealing temperature is high, the heat sealing film and a PP bottle are in contact with PE, the PE has the characteristics of excellent electrical insulation, chemical resistance, low temperature resistance, good processing fluidity and the like, but has the defects of poor heat resistance, poor atmospheric aging resistance and easiness in stress cracking, so that poor sealing can occur in the production and packaging process, the air-water separation performance is reduced, and the product is stored improperly. The invention improves the composite heat-sealing film, namely, the PET, al and PP+PE with specific types are used as raw materials for compounding to obtain the heat-sealing film, 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 has good guarantee on the survival of the probiotics.
In other preferred embodiments, the outer skin layer has a thickness of 4 to 8 μm; the core layer is 40-60 mu m; the thickness of the heat sealing layer is 20-60 mu m;
preferably, the thickness of the outer surface layer is 5-7 μm; the core layer is 45-55 mu m; the thickness of the heat sealing layer is 30-60 mu m;
still more preferably, the thickness of the outer surface layer is 6 μm; the core layer is 50 mu m; the thickness of the heat sealing layer is 30 mu m;
or, the thickness of the outer surface layer is 6 mu m; the core layer is 50 mu m; the thickness of the heat sealing layer is 60 mu m.
The invention obviously improves the long-term activity of probiotics in the probiotic products by controlling the thickness of each layer, and is more beneficial to the storage of the probiotic products.
The heat sealing temperature of the heat sealing film is more than 175 ℃.
The invention also provides a preparation method of the heat-sealing film, which comprises the following steps:
taking the outer surface layer, the core layer and the heat sealing layer with specific thickness, and preparing the heat sealing film packaging material through 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 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.
The beneficial effects are that:
(1) The invention adopts the PET/Al/PP+PE copolymer as the raw material to prepare the heat-sealing film, wherein the PP and PE copolymer has the advantages of PE and PP at the same time, is compounded with PET and Al, and controls the thickness of the three films, 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 has good guarantee on the survival 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 more than 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 probiotics in the probiotic products by controlling the thickness of each layer, and is more beneficial to the storage of the probiotic products.
Drawings
FIG. 1 is a schematic view of the heat-sealable film prepared in example 2.
Detailed Description
Example 1 Heat sealing film and method of making the same
The thickness of the heat sealing film is 86 mu m, and the heat sealing film comprises a three-layer structure, namely an outer surface layer, a core layer and a heat sealing layer.
The thickness of the outer surface layer is 6 mu m; the thickness of the core layer is 50 mu m; the thickness of the heat sealing layer is 30 mu m;
the outer layer raw material is polyethylene terephthalate, and the model is KLBD;
the core layer is made of aluminum, and the model is 8011;
the heat-sealing film is a PE-T heat-sealing removable film;
the preparation method comprises the following steps:
taking the outer surface layer, the core layer and the heat sealing layer with specific thickness, and preparing the heat sealing film packaging material through inspection, compounding, curing, slitting and die cutting.
The compounding temperature is 60 ℃;
the curing temperature is 30 ℃ and the time is 48 hours.
Example 2 Heat sealing film and method of making the same
The thickness of the heat sealing film is 116 mu m, and the heat sealing film comprises a three-layer structure, namely an outer surface layer, a printing layer, a core layer and a heat sealing layer.
The thickness of the outer surface layer is 6 mu m; the thickness of the core layer is 50 mu m; the thickness of the heat sealing layer is 60 mu m;
the outer layer raw material is polyethylene terephthalate, and the model is KLBD;
the core layer is made of aluminum, and the model is 8011;
the heat-sealing film is a PE-T heat-sealing removable film;
the preparation method comprises the following steps:
taking the outer surface layer, the core layer and the heat sealing layer with specific thickness, and preparing the heat sealing film packaging material through inspection, compounding, curing, slitting and die cutting.
The compounding temperature is 70 ℃;
the curing temperature is 40 ℃ and the time is 45 hours.
Comparative example 1A Heat sealing film and method for producing the same
The difference from example 2 is that: the heat sealing layer is made of polyethylene only, and is a model PE environment-friendly film; purchased from Hualong film stock limited in Jiangmen.
Comparative example 2
The difference from example 2 is that: the heat seal layer is a low temperature heat seal film available from Hubei Hui Shi Plastic Co., ltd. Under the model number SCPP.
Comparative example 3
The difference from example 2 is that: the thickness of each layer is different:
the thickness of the outer surface layer is 6 mu m; the thickness of the core layer is 50 mu m; the thickness of the heat sealing layer is 80 mu m.
Comparative example 4A heat-sealable film and method for producing the same
The multilayer heat-shrinkable film disclosed in example 2 of the prior art CN106113858A was used as a heat-sealable film.
Test examples
1. Experimental facilities:
LX-MFY-01 seal tester, available from guangdong Ai Sirui instruments technologies, inc;
full-automatic canning sealing capping machine, purchased from Jiangsu god next mechanical limited company;
LRH-250-S constant temperature and humidity incubator, purchased from Shaoguan Tay medical instruments Co., ltd;
water activity meter, available from Min's instrumentation (Xiamen) Inc.
The packaging form of the probiotic product in the experimental process is a PP bottle and a heat sealing film; the thickness of the PP bottle body is 2.0-2.5mm.
2. The experimental steps are as follows:
2.1. configuration 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; the prebiotics (one or more than two of fructo-oligosaccharide, galacto-oligosaccharide, polydextrose, isomaltooligosaccharide, inulin, stachyose, xylo-oligosaccharide, etc.) in the formula are weighed according to the dosage of the formula for standby. Food lactobacillus powder (one or more of Bifidobacterium adolescentis, bifidobacterium animalis (Lactobacillus bifidus), bifidobacterium bifidum, bifidobacterium breve, bifidobacterium infantis, bifidobacterium longum, lactobacillus acidophilus, lactobacillus casei, lactobacillus crispatus, lactobacillus delbrueckii subsp. Bulgaricus (Lactobacillus bulgaricus), lactobacillus delbrueckii subsp. Lactis, lactobacillus fermentum, lactobacillus gasseri, lactobacillus johnsonii, lactobacillus paracasei, lactobacillus plantarum, lactobacillus reuteri, lactobacillus rhamnosus, lactobacillus salivarius, streptococcus thermophilus, lactobacillus freudenreichii subsp. Lactis, lactobacillus lactis subsp. Lactis and Lactobacillus diacetyl subsp. Lactis, leuconostoc mesis subsp. Intestinal membrane subsp. Lactis, pediococcus pentosus, pediococcus coagulans) is weighed according to a formula amount for use.
Firstly, mixing lactobacillus powder (lactobacillus acidophilus, bifidobacterium lactis, lactobacillus plantarum and lactobacillus paracasei) used in the formula for 5 minutes, then adding equal amount of sugar alcohol (lactitol and xylitol) and mixing for 5 minutes, and finally, mixing the materials of the premix and other materials used in the formula for 30 minutes.
2.2. Bottled split charging
Debugging a full-automatic canning sealing capping machine, adding prepared probiotic powder into a hopper, adjusting the filling amount, and packaging several different heat sealing films.
3. Tightness test and packaging effect test
Randomly sampling, extracting 60 bottles of samples, placing the samples in an LX-MFY-01 sealing tester to test the sealing effect of the packaged samples, and recording data. 10 bottles were randomly sampled, the heat seal film on effect recorded, and the data recorded.
4. Investigation of probiotic Activity
Taking a packaged complete sample, placing the sample in a constant temperature and humidity incubator, setting the temperature to 25 ℃, and setting the humidity to 60% RH. And respectively detecting the survival number of lactic acid bacteria and the water activity of probiotic powder of different heat sealing film probiotics.
The results of the detection are shown in the following table 1:
TABLE 1
According to the detection data of the table 1, it can be seen that the heat sealing film prepared by using the embodiment 1-2 of the invention is used for heat sealing the probiotic products, the heat sealing temperature is relatively low, the heat sealing can be completed under the condition of 175-180 ℃, the heat sealing samples are not breathable, the lactobacillus count of the probiotic products is relatively high after being 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 comparative examples 1-2, the material of the heat sealing layer was changed, and in comparative example 3, the thickness ratio of the three layers of raw materials in the heat sealing film was changed, so that the heat sealing temperature was increased, and the obtained heat sealing film was used for heat sealing of probiotic products, and after 18 months of the products were placed, the probiotic activity was obviously reduced, thereby affecting eating. The heat sealing film disclosed in the prior art was used for probiotic food preservation in comparative example 4, and the probiotic stability was significantly reduced. In addition, the packaging mode of the packaging material provided by the invention improves the convenience in taking the probiotic powder.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (7)
1. A heat seal film for probiotics, characterized in that: the heat-sealing film consists of a three-layer structure, and sequentially comprises an outer surface layer, a core layer and a heat-sealing layer, wherein the thickness of the heat-sealing film is 64-128 mu m, and the outer surface layer is made of polyethylene terephthalate for packaging; the core layer is made of aluminum; the heat sealing layer is a mixture of polypropylene and polyethylene, and is a PE-T heat sealing removable easily-torn film purchased from Jiangyin Tongli photoelectric technology Co., ltd; the thickness of the outer surface layer is 5-7 mu m; the thickness of the core layer is 45-55 mu m; the thickness of the heat sealing layer is 30-60 mu m.
2. The heat seal film of claim 1 wherein: the polyethylene terephthalate for packaging is purchased from Dupont Hongkin film Co., ltd., model KLBD; the aluminum is purchased from Hangzhou five-star aluminum company, model 8011.
3. The heat-seal film according to claim 1, wherein: the thickness of the outer surface layer is 6 mu m; the thickness of the core layer is 50 mu m; the thickness of the heat sealing layer is 30 mu m.
4. The heat-seal film according to claim 1, wherein: the thickness of the outer surface layer is 6 mu m; the thickness of the core layer is 50 mu m; the thickness of the heat sealing layer is 60 mu m.
5. A process for the preparation of a heat sealable film for probiotics as claimed in any of claims 1 to 4, characterized in that: the method comprises the following steps: and taking the outer surface layer, the core layer and the heat sealing layer with the thickness, and preparing the heat sealing film packaging material through inspection, compounding, curing, slitting and die cutting.
6. The method of manufacturing according to claim 5, wherein: the compounding temperature is 60-70 ℃; the curing temperature is 30-40 ℃ and the curing time is 45-48 hours.
7. Use of the heat-sealable film for probiotics according to any of claims 1 to 4 in food packaging.
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Citations (4)
| 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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Patent Citations (4)
| 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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