CN112277415A - Medium-resistant composite membrane capable of achieving secondary sterilization and preparation method thereof - Google Patents

Medium-resistant composite membrane capable of achieving secondary sterilization and preparation method thereof Download PDF

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Publication number
CN112277415A
CN112277415A CN202011104248.4A CN202011104248A CN112277415A CN 112277415 A CN112277415 A CN 112277415A CN 202011104248 A CN202011104248 A CN 202011104248A CN 112277415 A CN112277415 A CN 112277415A
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China
Prior art keywords
layer
printing
base layer
printing ink
printing base
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Pending
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CN202011104248.4A
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Chinese (zh)
Inventor
卿前仲
陈威
张朋
卫敏
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GOLDSTONE PACKAGING (JIAXING) CO Ltd
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GOLDSTONE PACKAGING (JIAXING) CO Ltd
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Priority to CN202011104248.4A priority Critical patent/CN112277415A/en
Publication of CN112277415A publication Critical patent/CN112277415A/en
Pending legal-status Critical Current

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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
    • 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
    • B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
    • 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
    • B32B27/02—Layered products comprising a layer of synthetic resin in the form of fibres or filaments
    • 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
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • 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
    • 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
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0036—Heat treatment
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/14—Printing or colouring
    • B32B38/145—Printing
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/16—Drying; Softening; Cleaning
    • B32B38/164—Drying
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • 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
    • B32B2307/306—Resistant to heat
    • 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
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging

Abstract

The invention relates to a composite membrane capable of achieving secondary sterilization and medium resistance, which comprises a body, wherein the body sequentially comprises a printing base layer, a middle layer and a heat sealing layer, the printing base layer is provided with a printing layer, the printing layer is formed by printing ink, the printing ink comprises cooking type printing ink and a curing agent, and the printing base layer, the middle layer and the heat sealing layer are bonded through medium-resistant glue; the invention has the advantages that: the printing layer is provided with the layer of printing ink, and the printing ink adopts cooking type printing ink, so that the surface of the whole composite membrane has good high-temperature sterilization performance, and can be sterilized at the high temperature of 100-135 ℃ for 30-60 min, the sterilized product can be ensured not to change color, break bags and wrinkles, the quality of the product in the shelf life is stable, and the food preservation time is greatly prolonged.

Description

Medium-resistant composite membrane capable of achieving secondary sterilization and preparation method thereof
Technical Field
The invention relates to a composite membrane capable of secondary sterilization and medium resistance and a preparation method thereof.
Background
The soft food has various types, the properties of various foods are different from each other, and the causes of food deterioration are also different, but the main factor of food deterioration is caused by the production and propagation of microorganisms in the food. Generally, food materials are microbially loaded. Food products may also contaminate microorganisms during the harvesting, transportation, processing, and storage of the food product. Under certain conditions, these microorganisms can grow and multiply in the food, so that the food loses the original or due nutritive value and sensory quality, and even produces harmful and toxic substances. Microorganisms in food products are the main cause of the intolerance of storage of food products, and bacteria, molds and yeasts all can cause deterioration of food products. The bacteria are the main microorganisms causing food spoilage, and the bacteria with high heat resistance are spore bacteria and need to be sterilized by high-temperature steam. The optimal growth temperature of different microorganisms is different, and when the temperature is higher than the optimal growth temperature of the microorganisms, the growth of the microorganisms is inhibited, and when the temperature is high enough to denature proteins in the microorganisms, the microorganisms die. It is generally believed that the ability of proteins within microbial cells to undergo thermal coagulation and lose metabolism is responsible for the death of the microbes caused by the heat. Therefore, the ease with which intracellular proteins coagulate by heating is directly related to the thermotolerance of the microorganism.
There are many ways of food sterilization, among which the secondary sterilization method is common in liquid food packaging, and the secondary sterilization method can be divided into an intermittent type and a continuous type according to the equipment operation mode; the batch type is that the product is sterilized for the first time by adopting a tubular ultra-high temperature sterilizer, and then is put into a batch type sterilizer for the second time after being filled and sealed; the continuous type means that the first sterilization of the product adopts a tubular or plate type ultra-high temperature sterilizer, and the second sterilization adopts a continuous sterilizer. The product sterilized by the method has long shelf life, and is suitable for long-distance storage and transportation.
The food itself is a substance with very complex ingredients, including water, oil, salt, wine, and also peppery, spices, even acetic acid, citric acid, lactic acid, sugar, sulfide, oxide, etc. In the face of these complex ingredients, the packaging is subjected to high and low temperature treatment and long-term storage, the quality of the packaging composite film is required to be kept stable, the stability of the adhesive is important in addition to the excellent medium corrosion resistance of the base material film, and the adhesive can withstand the corrosion of various media, otherwise the composite film is delaminated and peeled off to lose the packaging effect, so that the food cannot be stored for the required time.
Disclosure of Invention
The invention aims to provide a composite film capable of secondary sterilization and medium resistance, which can ensure that the composite film has good high-temperature sterilization resistance and greatly prolongs the food preservation time.
In order to solve the technical problems, the invention is realized by the following technical scheme: the composite membrane capable of achieving secondary sterilization and medium resistance comprises a body, wherein the body sequentially comprises a printing base layer, a middle layer and a heat sealing layer from outside to inside, the printing base layer is a biaxially oriented polyester film, the middle layer comprises an aluminum foil layer or the aluminum foil layer and a nylon layer, the heat sealing layer is polyethylene or cast polypropylene, the surface tension value of the printing base layer is not less than 52 dynes, a printing layer is arranged on the printing base layer and is formed by printing ink, the printing ink comprises cooking type printing ink and a curing agent, and the printing base layer, the middle layer and the heat sealing layer are bonded through medium-resistant glue.
Preferably, the thickness of printing basic unit equals 7 ~ 12um, the thickness of aluminium foil layer equals 7 ~ 50um, just the state of aluminium foil layer is O, the thickness on nylon layer equals 15 ~ 25um, the thickness on heat-seal layer equals 50 ~ 100um, just the dyne value of heat-seal layer composite surface is not less than 38.
Preferably, the medium-resistant glue is a cooking type two-component polyurethane adhesive.
Preferably, the body is integrally formed by dry lamination.
The invention also provides a preparation method of the composite membrane capable of secondary sterilization and medium resistance, which is used for preparing the composite membrane and sequentially comprises the following steps:
the method comprises the following steps: preparing a printing base layer: the printing base layer is arranged on an unreeling frame of an intaglio printing press, then printing ink is coated on the surface of the printing base layer through the intaglio printing press, and the printing base layer is dried, wherein the printing speed is not less than 240M/min, and the drying temperature is 40-85 ℃;
step two: and (2) mounting the printing base layer prepared in the first step on a unreeling frame of a dry compound machine, compounding the printing base layer on the middle layer through a cooking type two-component polyurethane adhesive, treating the sol of the cooking type two-component polyurethane adhesive through an oven before compounding, sequentially performing the operations, compounding the heat sealing layer, and curing the compounded composite film in a curing chamber, wherein the coating amount of the cooking type two-component polyurethane adhesive is 4.0 g/square meter, the coating speed of the cooking type two-component polyurethane adhesive is 80-120M/min, the curing temperature is 45-50 ℃, and the curing time is 90-100 h.
Preferably, when the printing ink area M on the printing base layer in the step one is more than or equal to 80%, the drying temperature is 60-85 ℃, when the printing ink area M on the printing base layer in the step one is less than 30%, the drying temperature is 40-60 ℃, and when the printing ink area M on the printing base layer in the step one is more than 80% and more than 30%, the drying temperature is 50-70 ℃.
In conclusion, the invention has the advantages that: the printing layer is provided with the layer of printing ink, the printing ink adopts the cooking type printing ink, so that the surface of the whole composite film has good high-temperature sterilization performance, the composite film can be sterilized at the high temperature of 100-135 ℃ for 30-60 min, the sterilized product can be ensured not to change color, the bag is not broken and folded, the quality stability of the product in the quality guarantee period is realized, the food preservation time is greatly prolonged, the composite film has great market prospect, society and economic benefit in the fields of sterilized food and health care products, secondly, the curing agent is added into the printing ink, the printing ink can have good printing adhesion fastness, and finally, the middle layer is set into the structure of an aluminum foil layer or the structure of the aluminum foil layer and a nylon layer, different middle layers can be set according to different requirements, the strength of the whole composite film is improved, different soft packaging bags are met, and the heat sealing layer can meet the requirement.
Detailed Description
Example one
The composite membrane capable of achieving secondary sterilization and medium resistance comprises a body, wherein the body sequentially comprises a printing base layer, a middle layer and a heat sealing layer from outside to inside, the printing base layer is a biaxially oriented polyester film, the middle layer comprises an aluminum foil layer or the aluminum foil layer and a nylon layer, the heat sealing layer is polyethylene or cast polypropylene, the surface tension value of the printing base layer is not less than 52 dynes, a printing layer is arranged on the printing base layer and is formed by printing ink, the printing ink comprises cooking type printing ink and a curing agent, and the printing base layer, the middle layer and the heat sealing layer are bonded through medium-resistant glue.
The printing layer is provided with the layer of printing ink, the printing ink adopts the cooking type printing ink, so that the surface of the whole composite film has good high-temperature sterilization performance, the composite film can be sterilized at the high temperature of 100-135 ℃ for 30-60 min, the sterilized product can be ensured not to change color, the bag is not broken and folded, the quality stability of the product in the quality guarantee period is realized, the food preservation time is greatly prolonged, the composite film has great market prospect, society and economic benefit in the fields of sterilized food and health care products, secondly, the curing agent is added into the printing ink, the printing ink can have good printing adhesion fastness, and finally, the middle layer is set into the structure of an aluminum foil layer or the structure of the aluminum foil layer and a nylon layer, different middle layers can be set according to different requirements, the strength of the whole composite film is improved, different soft packaging bags are met, and the heat sealing layer can meet the requirement.
The thickness of printing basic unit equals 7 ~ 12um, the thickness on aluminium foil layer equals 7 ~ 50um, just the state on aluminium foil layer is O, the thickness on nylon layer equals 15 ~ 25um, the thickness on heat-seal layer equals 50 ~ 100um, just the arrival factor value of heat-seal layer complex face is not less than 38, can adapt to different demands, can set up the thickness of body according to the packing material of reality, and practicality is good.
The medium-resistant glue is a cooking type double-component polyurethane adhesive, so that the composite film has good high-temperature sterilization performance and good medium-resistant effect, the specific medium comprises acid, alkali, oil, salt, alcohol, chilli sauce, spice, acetic acid, citric acid, lactic acid and sugar, the packaging requirements of different foods can be met, the body is integrally formed by dry compounding, the body is conveniently integrally formed, the processing technology of the body is simplified, and the quality of the body is improved.
Example two:
the utility model provides a but resistant complex film of medium of secondary sterilization, includes the body, from outer to interior the body is including printing basic unit, intermediate level and heat-seal layer in proper order, the printing basic unit is biaxial stretching polyester film, the intermediate level includes the aluminium foil layer, the heat-seal layer is polyethylene, just the thickness of printing basic unit is 12um, the thickness in intermediate level is 7um, the thickness on heat-seal layer is 55 um.
Example three:
the utility model provides a but resistant complex film of medium of secondary sterilization, includes the body, from outer to interior the body is including printing basic unit, intermediate level and heat-seal layer in proper order, the printing basic unit is biaxial stretching polyester film, the intermediate level includes the aluminium foil layer, the heat-seal layer is polyethylene, just the thickness of printing basic unit is 12um, the thickness in intermediate level is 7um, the thickness on heat-seal layer is 60 um.
Example four:
the utility model provides a but resistant complex film of medium of secondary sterilization, includes the body, from outer to interior the body is including printing basic unit, intermediate level and heat-seal layer in proper order, the printing basic unit is biaxial stretching polyester film, the intermediate level includes aluminium foil layer and nylon layer, the heat-seal layer is polyethylene, just the thickness of printing basic unit is 12um, the thickness on aluminium foil layer is 7um, the thickness on nylon layer is 15um, the thickness on heat-seal layer is 55 um.
Example five:
the utility model provides a but resistant complex film of medium of secondary sterilization, includes the body, from outer to interior the body is including printing basic unit, intermediate level and heat-seal layer in proper order, the printing basic unit is biaxial stretching polyester film, the intermediate level includes aluminium foil layer and nylon layer, the heat-seal layer is curtain coating polypropylene, just the thickness of printing basic unit is 12um, the thickness on aluminium foil layer is 7um, the thickness on nylon layer is 15um, the thickness on heat-seal layer is 70 um.
EXAMPLE six
The embodiment also provides a preparation method of the composite membrane capable of secondary sterilization and medium resistance, which is used for preparing the composite membranes of the first, second, third, fourth and fifth embodiments, and the preparation method sequentially comprises the following steps:
the method comprises the following steps: preparing a printing base layer: the printing base layer is arranged on an unreeling frame of an intaglio printing press, then printing ink is coated on the surface of the printing base layer through the intaglio printing press, and the printing base layer is dried, wherein the printing speed is not less than 240M/min, and the drying temperature is 40-85 ℃;
step two: and (2) mounting the printing base layer prepared in the first step on a unreeling frame of a dry compound machine, compounding the printing base layer on the middle layer through a cooking type two-component polyurethane adhesive, treating the sol of the cooking type two-component polyurethane adhesive through an oven before compounding, sequentially performing the operations, compounding the heat sealing layer, and curing the compounded composite film in a curing chamber, wherein the coating amount of the cooking type two-component polyurethane adhesive is 4.0 g/square meter, the coating speed of the cooking type two-component polyurethane adhesive is 80-120M/min, the curing temperature is 45-50 ℃, and the curing time is 90-100 h.
When the printing ink area M on the printing base layer in the step one is more than or equal to 80%, the drying temperature is 60-85 ℃, when the printing ink area M on the printing base layer in the step one is less than 30%, the drying temperature is 40-60 ℃, and when the printing ink area M on the printing base layer in the step one is more than 80% and more than 30%, the drying temperature is 50-70 ℃.
Detecting the appearances of the composite films after the second, third, fourth and fifth preparation according to GB/T7707-2008; detecting solvent residue (not more than 5.0mg per square meter) by a method required by GB/T10004 + 2008 < plastic composite film for packaging, bag dry compounding and extrusion compounding >, and cooking the mixture at the temperature of 121 ℃ and 135 ℃ for 30 minutes respectively, wherein the problems of no discoloration, delamination, no leakage, no bag breakage and no wrinkles are required, and the specific detection results are shown in the table I:
Figure BDA0002726405810000081
watch 1
Other embodiments of the present invention than the preferred embodiments described above will be apparent to those skilled in the art from the present invention, and various changes and modifications can be made therein without departing from the spirit of the present invention as defined in the appended claims.

Claims (6)

1. The utility model provides a but resistant complex film of medium of secondary sterilization, includes the body, from outer to interior the body includes printing basic unit, intermediate level and heat-seal layer, its characterized in that in proper order: the printing base layer is a biaxially oriented polyester film, the middle layer comprises an aluminum foil layer or an aluminum foil layer and a nylon layer, the heat sealing layer is polyethylene or cast polypropylene, the surface tension value of the printing base layer is not less than 52 dynes, the printing base layer is provided with a printing layer, the printing layer is formed by printing ink, the printing ink comprises cooking type printing ink and a curing agent, and the printing base layer, the middle layer and the heat sealing layer are bonded through medium-resistant glue.
2. A sterilizable secondary dielectric-resistant composite film according to claim 1, wherein: the thickness of printing basic unit equals 7 ~ 12um, the thickness on aluminium foil layer equals 7 ~ 50um, just the state on aluminium foil layer is O, the thickness on nylon layer equals 15 ~ 25um, the thickness on heat-seal layer equals 50 ~ 100um, just the dyne value of heat-seal layer complex face is not less than 38.
3. A sterilizable secondary dielectric-resistant composite film according to claim 1, wherein: the medium-resistant glue is a cooking type two-component polyurethane adhesive.
4. A sterilizable twice media-resistant composite film according to claims 1 to 3, characterized in that: the body is integrally formed by dry compounding.
5. A preparation method of a composite membrane capable of secondary sterilization and medium resistance is characterized in that: for the preparation of a composite membrane according to any one of claims 1 to 4, comprising the following steps in sequence:
the method comprises the following steps: preparing a printing base layer: the printing base layer is arranged on an unreeling frame of an intaglio printing press, then printing ink is coated on the surface of the printing base layer through the intaglio printing press, and the printing base layer is dried, wherein the printing speed is not less than 240M/min, and the drying temperature is 40-85 ℃;
step two: and (2) mounting the printing base layer prepared in the first step on a unreeling frame of a dry compound machine, compounding the printing base layer on the middle layer through a cooking type two-component polyurethane adhesive, treating the sol of the cooking type two-component polyurethane adhesive through an oven before compounding, sequentially performing the operations, compounding the heat sealing layer, and curing the compounded composite film in a curing chamber, wherein the coating amount of the cooking type two-component polyurethane adhesive is 4.0 g/square meter, the coating speed of the cooking type two-component polyurethane adhesive is 80-120M/min, the curing temperature is 45-50 ℃, and the curing time is 90-100 h.
6. The method for preparing a composite membrane capable of secondary sterilization and medium resistance according to claim 5 is characterized in that: when the printing ink area M on the printing base layer in the step one is more than or equal to 80%, the drying temperature is 60-85 ℃, when the printing ink area M on the printing base layer in the step one is less than 30%, the drying temperature is 40-60 ℃, and when the printing ink area M on the printing base layer in the step one is more than 80% and more than 30%, the drying temperature is 50-70 ℃.
CN202011104248.4A 2020-10-15 2020-10-15 Medium-resistant composite membrane capable of achieving secondary sterilization and preparation method thereof Pending CN112277415A (en)

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CN105563967A (en) * 2014-10-13 2016-05-11 宜昌宏裕塑业有限责任公司 High-barrier transparent composite packaging film applicable to boiling sterilization process
CN110561876A (en) * 2019-09-23 2019-12-13 安徽屹珹新材料科技有限公司 Transparent oxide high-barrier composite film and preparation method thereof

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CN105563967A (en) * 2014-10-13 2016-05-11 宜昌宏裕塑业有限责任公司 High-barrier transparent composite packaging film applicable to boiling sterilization process
CN110561876A (en) * 2019-09-23 2019-12-13 安徽屹珹新材料科技有限公司 Transparent oxide high-barrier composite film and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114603947A (en) * 2022-03-14 2022-06-10 湖南箔乐新材料科技有限公司 Embossed high-temperature easy-to-tear sealing film

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