CN113211898A - Coating film for food packaging - Google Patents

Coating film for food packaging Download PDF

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Publication number
CN113211898A
CN113211898A CN202110591370.7A CN202110591370A CN113211898A CN 113211898 A CN113211898 A CN 113211898A CN 202110591370 A CN202110591370 A CN 202110591370A CN 113211898 A CN113211898 A CN 113211898A
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China
Prior art keywords
layer
coating film
film
food packaging
food
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Pending
Application number
CN202110591370.7A
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Chinese (zh)
Inventor
王恩飞
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Hainan Shiner Industrial Co Ltd
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Hainan Shiner Industrial Co Ltd
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Priority to CN202110591370.7A priority Critical patent/CN113211898A/en
Publication of CN113211898A publication Critical patent/CN113211898A/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
    • 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
    • B32B7/06—Interconnection of layers permitting easy separation
    • 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
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin 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
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of 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
    • 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
    • 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
    • B65D65/42—Applications of coated or impregnated materials
    • 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
    • B32B2262/06—Vegetal fibres
    • B32B2262/062—Cellulose fibres, e.g. cotton
    • 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
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B32B2307/4026—Coloured within the layer by addition of a colorant, e.g. pigments, dyes
    • 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
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • 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
    • 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
    • B65D2565/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D2565/38—Packaging materials of special type or form
    • B65D2565/381—Details of packaging materials of special type or form

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)

Abstract

The invention provides a coating film for food packaging, which comprises an upper protective layer, a coating film body and a lower protective layer which are sequentially overlapped; the coating film body comprises an environment-friendly purification layer, a base layer film, a color development layer, a separation interlayer and a protective outer surface layer which are sequentially arranged. The application provides a food packaging is with coating film when specific application, when the inside of coating film body breaks, the membrane of separation interlayer bottom will take place to damage for the inside developer in color development layer can permeate the separation interlayer, thereby can observe the color change, in time knows food packaging's damaged condition, has improved the degree of safety of commodity packing from this.

Description

Coating film for food packaging
Technical Field
The invention relates to the technical field of food packaging, in particular to a coating film for food packaging.
Background
Food packaging is an important component of commercial food products. One of the major projects in the food industry process. It protects the food, prevents the damage of biological, chemical and physical external factors in the process of the food leaving the factory to the hand of the consumer, and also has the function of keeping the stable quality of the food, thereby being convenient for the food to eat; on the other hand, food packaging can also present the appearance of the food first, attracting the appearance of consumption, with value beyond the cost of the material. Therefore, the food packaging process is also an integral part of the food manufacturing system engineering. The versatility of the food packaging process, however, allows it to be relatively self-contained, requiring the use of packaging films during operation.
When a common food packaging film is used, if the inside of the film is broken, an eater often cannot know the breaking condition of the food in time, so that people can mistakenly eat the broken food, the health of people is threatened, and meanwhile, the common packaging film cannot play a role in purifying and adsorbing the food.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a coating film for food packaging, which can conveniently observe internal fracture and can play a role in purifying and adsorbing food.
In view of the above, the present application provides a coating film for food packaging, including an upper protective layer, a coating film body and a lower protective layer, which are sequentially stacked;
the coating film body is provided with an environment-friendly purification layer at the side contacting with food,
a base layer film is arranged on the outer side of the environment-friendly purification layer,
one side of the base layer film, which is far away from the environment-friendly purification layer, is provided with a color development layer,
one side of the color development layer far away from the base layer film is provided with a barrier interlayer,
and one side of the barrier interlayer, which is far away from the color development layer, is provided with a protective outer surface layer.
Preferably, the edge of one side, away from the coating film body, of the upper protection layer is provided with an easy-tearing block.
Preferably, the surface of the barrier interlayer far away from the color development layer is provided with a transparent observation strip, and the side surface of the transparent observation strip is in contact with the inside of the protective outer surface layer.
Preferably, the height of the transparent observation strip is 0.1-0.2 mm higher than that of the protective outer surface layer.
Preferably, the thickness of the protective outer surface layer is 0.2-0.5 mm, and the protective outer surface layer is a transparent polyhydroxyalkanoate film.
Preferably, the thickness of the separation interlayer is 0.1-0.3 mm, the separation interlayer is a white cotton fiber film, and a polyethylene film is arranged on one side of the separation interlayer, which is in contact with the color development layer.
Preferably, the thickness of the color development layer is 0.3-0.5 mm, the matrix of the color development layer is cotton fiber, a developer solution is absorbed in the cotton fiber, and the developer is cornflower-3-glucoside food pigment.
Preferably, the thickness of the base layer film is 0.2-0.4 mm, the base layer film is a polypropylene PP material film, and the upper surface and the lower surface of the polypropylene PP material film are coated with modified EVOH latex.
Preferably, the thickness of the environment-friendly purification layer is 0.1-0.3 mm, and the environment-friendly purification layer is a polypropylene crystal nano film filled with bamboo charcoal particles.
Preferably, the thickness of the upper protective layer is 0.1-1.0 mm, and the thickness of the lower protective layer is 0.1-1.0 mm.
The application provides a coating film for food packaging, which comprises an upper protective layer, a coating film body and a lower protective layer which are sequentially overlapped, wherein the coating film body comprises a protective outer surface layer, a barrier layer, a color development layer, a base layer film and an environment-friendly purification layer; in the application, when the coating film body is cracked, the film at the bottom of the barrier layer is damaged, so that the developer in the color development layer permeates the barrier interlayer, the color change can be observed, the damage condition of food packages can be known, and the safety of commodity packages can be improved; furthermore, the bamboo charcoal particles are filled in the environment-friendly purification layer, and can purify and adsorb gas in food, so that the cleanness and the environment friendliness of the interior of the commodity are improved, and the food edible safety is improved.
Drawings
FIG. 1 is a schematic structural view of a coating film for food packaging according to the present invention;
FIG. 2 is a schematic structural view of each layer of a coating film body of the coating film for food packaging according to the present invention;
fig. 3 is a schematic view of the overall structure of the coating film body for food packaging according to the present invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
In view of the problem that the rupture condition of the film for food packaging in the prior art cannot be known in time, the application provides a coating film for food packaging, and as shown in fig. 1, fig. 2 and fig. 3, in the figure, 1 is a coating film body, 2 is an upper protective layer, 3 is a lower protective layer, 4 is an easy-tear block, 5 is a transparent observation strip, 6 is a protective outer surface layer, 7 is a barrier interlayer, 8 is a color development layer, 9 is a base layer film, and 10 is an environment-friendly purification layer. Specifically, the embodiment of the invention discloses a coating film for food packaging, which comprises an upper protective layer, a coating film body and a lower protective layer which are sequentially overlapped;
the coating film body is provided with an environment-friendly purification layer at the side contacting with food,
a base layer film is arranged on the outer side of the environment-friendly purification layer,
one side of the base layer film, which is far away from the environment-friendly purification layer, is provided with a color development layer,
one side of the color development layer far away from the base layer film is provided with a barrier interlayer,
and one side of the barrier interlayer, which is far away from the color development layer, is provided with a protective outer surface layer.
In this application, the coating film for food package is including last protective layer 2, coating film body 1 and the lower protective layer 3 that superposes in proper order and set up, and is concrete, and the upper surface of coating film body 1 has last protective layer 2 through non-stick adhesive bonding, and the lower surface of coating film body 1 has lower protective layer 3 through non-stick adhesive bonding, and the upper surface edge of coating film body 1 bonds and has easily torn piece 4, easily tear piece 4 and tear with upper protective layer 2 and lower protective layer 3 on the upper and lower both sides surface of coating film body 1.
The coating film body 1 specifically comprises a protective outer surface layer 6, a barrier interlayer 7, a color development layer 8, a base layer film 9 and an environment-friendly purification layer 10, and preferably further comprises a transparent observation strip 5. More specifically: the inner side surface of the coating film body 1, which is contacted with food when in use, is provided with an environment-friendly purification layer 10, namely, the environment-friendly purification layer 10 is directly contacted with packaged food and is contacted with the lower protection layer 3. The thickness of the environment-friendly purification layer 10 is 0.1-0.3 mm, and more specifically, the thickness of the environment-friendly purification layer 10 is 0.15 mm. The environment-friendly purification layer 10 is a polyacrylonitrile nano-film, and the polyacrylonitrile nano-film is soaked in a bamboo charcoal solution for one hour during production, so that bamboo charcoal particles are filled in the polyacrylonitrile nano-film, the purification and adsorption of the polyacrylonitrile nano-film on gas in food are increased, the cleanness and the environment friendliness of the interior of a commodity are increased, and the food edible safety is improved.
The outer side surface of the environment-friendly purification layer 10 is provided with a base layer film 9, the thickness of the base layer film 9 is 0.2-0.4 mm, and more specifically, the thickness of the base layer film 9 is 0.28 mm. The base film 9 is a polypropylene PP material film, and the upper and lower surface bonding layers of the polypropylene PP material film are coated with modified EVOH latex.
A color development layer 8 is arranged on one side surface of the base film 9 far away from the environment-friendly purification layer 10, the thickness of the color development layer 8 is 0.3-0.5 mm, and more specifically, the thickness of the color development layer 8 is 0.35 mm. The color development layer 8 adopts cotton fiber as a base layer, a color development agent dissolving solution is added in the cotton base layer, and the color development agent is cornflower-3-glucoside food pigment, so that the color development layer has a good color development effect, is long in color development retention time and can be retained for a long time.
One side surface of the color development layer 8, which is far away from the base layer film 9, is provided with a separation interlayer 7, and the thickness of the separation interlayer 7 is 0.1-0.3 mm, more specifically, the thickness of the separation interlayer is 0.20 mm. The barrier interlayer 7 is a white cotton fiber film, and a polyethylene film is adhered to the surface of one side, in contact with the color development layer 8, of the barrier interlayer 7.
And a protective outer surface layer 6 is arranged on one side surface of the barrier interlayer 7 far away from the color development layer 8, and the protective outer surface layer 6 is in contact with the upper protective layer 2. The surface of the separation interlayer 7, which is far away from the color development layer 8, is provided with a transparent observation strip 5, namely the upper protective layer is arranged on the surface of the separation interlayer, the lower surface of the transparent observation strip 5 is in contact with the upper surface of the separation interlayer 7, the front side surface and the rear side surface of the transparent observation strip 5 are in contact with the inside of the protective outer surface layer 6, the height of the transparent observation strip 5 is 0.1-0.2 mm higher than that of the protective outer surface layer 6, more specifically 0.15mm, and the transparent observation strip 5 is made of a transparent PC material. When the inside of coating film body 1 broke, the membrane of separation interlayer 7 bottom will take place the breakage this moment to make the red solution of cornflower-3-glucoside in development layer 8 inside can soak separation interlayer 7, thereby just can observe the colour change through transparent observation strip 5 and protection extexine 6, thereby in time know the damaged condition of food package, thereby improved the degree of safety of commodity packing.
For further understanding of the present invention, the following examples are given to illustrate the coating film for food packaging of the present invention in detail, and the scope of the present invention is not limited by the following examples.
A coating film for food packaging, as shown in fig. 1 and 2, comprising a coating film body (1), wherein an upper protective layer (2) is adhered to the upper surface of the coating film body (1) through a non-stick adhesive, a lower protective layer (3) is adhered to the lower surface of the coating film body (1) through a non-stick adhesive, and an easy-to-tear block (4) is adhered to the edge of the upper surface of the coating film body (1);
the coating film comprises a coating film body (1), wherein an environment-friendly purification layer (10) is arranged on the inner side surface, which is in contact with food when in use, of the coating film body (1), a base film (9) is arranged on the outer side surface of the environment-friendly purification layer (10), a color development layer (8) is arranged on one side surface, which is far away from the environment-friendly purification layer (10), of the base film (9), a separation interlayer (7) is arranged on one side surface, which is far away from the base film (8), of the color development layer (8), a protection outer surface layer (6) is arranged on one side surface, which is far away from the color development layer (8), of the separation interlayer (7), a transparent observation strip (5) is bonded on the upper surface of the separation interlayer (7), the lower surface of the transparent observation strip (5) is in contact with the upper surface of the separation interlayer (7), the front side surface and the rear side surface of the transparent observation strip (5) are in contact with the interior of the protection outer surface layer (6), and the height of the transparent observation strip (5) is 0.15mm higher than that of the protection outer surface layer (6), the transparent observation strip (5) is made of transparent PC material.
Example 1
This kind of coating film for food package uses, can tear upper protective layer 2 and lower protective layer 3 on both sides surface about the coating film body 1 through easily tearing off piece 4 earlier, after tearing, take out upper protective layer 2, begin to tailor according to the specific demand when food package, after cutting out, can pack food, at the in-process that food package is good, if the inside of coating film body 1 has taken place to break, the membrane of separation interstration 7 bottom will take place the damage this moment, thereby make the red solution of cornflower-3-glucoside inside in color development layer 8 can soak separation interstration 7, thereby just can observe the colour change through transparent observation strip 5 and protection extexine 6, thereby in time know the damaged condition of food package, thereby the degree of safety of commodity packing has been improved.
Example 2
After the food is stored for a long time, if the food has foreign flavor inside, the bamboo charcoal particles are added inside the environment-friendly purification layer 10 which is in contact with the food, so that the gas inside the food can be purified and adsorbed, thereby increasing the cleanness and the environment-friendly property inside the commodity and improving the food edible safety.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The coating film for food packaging is characterized by comprising an upper protective layer, a coating film body and a lower protective layer which are sequentially overlapped;
the coating film body is provided with an environment-friendly purification layer at the side contacting with food,
a base layer film is arranged on the outer side of the environment-friendly purification layer,
one side of the base layer film, which is far away from the environment-friendly purification layer, is provided with a color development layer,
one side of the color development layer far away from the base layer film is provided with a barrier interlayer,
and one side of the barrier interlayer, which is far away from the color development layer, is provided with a protective outer surface layer.
2. The coating film for food packaging according to claim 1, wherein an edge of the upper protective layer on the side away from the coating film body is provided with an easy-tear block.
3. The coating film for food packaging according to claim 1 or 2, wherein a surface of the barrier interlayer remote from the color development layer is provided with a transparent viewing strip, a side surface of which is in contact with an inside of the protective outer skin layer.
4. The coating film for food packaging according to claim 3, wherein the height of the transparent viewing bar is 0.1 to 0.2mm higher than the height of the protective outer surface layer.
5. The coating film for food packaging according to claim 3, wherein the thickness of the protective outer surface layer is 0.2 to 0.5mm, and the protective outer surface layer is a transparent polyhydroxyalkanoate film.
6. The coated film for food packaging according to claim 3, wherein the thickness of the barrier interlayer is 0.1 to 0.3mm, the barrier interlayer is a white cotton fiber film, and a polyethylene film is provided on the side of the barrier interlayer in contact with the color layer.
7. The coating film for food packaging according to claim 3, wherein the color developing layer has a thickness of 0.3 to 0.5mm, the matrix of the color developing layer is a cotton fiber, a developer solution is absorbed in the cotton fiber, and the developer is a cornflower-3-glucoside food coloring.
8. The coating film for food packaging according to claim 3, wherein the base film has a thickness of 0.2 to 0.4mm, is a polypropylene PP material film, and has upper and lower surfaces coated with modified EVOH latex.
9. The coating film for food packaging as claimed in claim 3, wherein the thickness of the environmentally friendly purification layer is 0.1 to 0.3mm, and the environmentally friendly purification layer is a polypropylene crystal nano film filled with bamboo charcoal particles.
10. The coating film for food packaging according to claim 3, wherein the thickness of the upper protective layer is 0.1 to 1.0mm, and the thickness of the lower protective layer is 0.1 to 1.0 mm.
CN202110591370.7A 2021-05-28 2021-05-28 Coating film for food packaging Pending CN113211898A (en)

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Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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