CN110901190A - Co-extruded film with improved performance and preparation method thereof - Google Patents

Co-extruded film with improved performance and preparation method thereof Download PDF

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Publication number
CN110901190A
CN110901190A CN201811117913.6A CN201811117913A CN110901190A CN 110901190 A CN110901190 A CN 110901190A CN 201811117913 A CN201811117913 A CN 201811117913A CN 110901190 A CN110901190 A CN 110901190A
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film
layer
extruded
coextruded film
extruded film
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汪忠志
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Anhui Yancai Packaging Materials Co Ltd
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Anhui Yancai Packaging Materials Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (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
    • 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
    • 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
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • 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
    • B32B2250/24—All layers being polymeric
    • 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
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • 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
    • B32B2250/42—Alternating layers, e.g. ABAB(C), AABBAABB(C)
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/28—Multiple coating on one surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582—Tearability
    • 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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The invention discloses a co-extruded film with improved performance, which comprises a co-extruded film structure layer compounded on a plurality of layers of co-extruded films, wherein the compounded structure layer is called a co-extruded film improved layer or a co-extruded film protective layer, and the co-extruded film improved layer or the co-extruded film protective layer is used for improving the performance of the co-extruded film or protecting the surface of the co-extruded film. The invention adds one or more layers of modified materials on the surface of the multilayer co-extruded film by a coating process, and the compounded materials have certain special functions. Can meet a plurality of special requirements, in particular various functional requirements on the heat sealing layer material.

Description

Co-extruded film with improved performance and preparation method thereof
Technical Field
The invention relates to a processing method of a plastic film, in particular to a co-extruded film with improved performance and a preparation method thereof.
Background
At present, multilayer co-extrusion plastic films are more and more widely applied, and particularly barrier films, whether multilayer co-extrusion blown films or multilayer co-extrusion cast films, play more and more important roles in the fields of food packaging, industrial product packaging and other special packaging. The multilayer co-extruded film is formed by melting and plasticizing various polymer materials such as Polyethylene (PE), polypropylene (PP), Polyamide (PA), ethylene-vinyl alcohol copolymer (EVOH), ethylene-vinyl acetate copolymer (EVA) and the like, other modified resins and fillers through a plurality of screws respectively, matching the rheological property and the pressure of various resins, and combining the resins into a layer of film through a multilayer die head. The multilayer coextrusion is divided into multilayer coextrusion blown film and multilayer coextrusion cast film, and generally, the multilayer coextrusion film refers to a film having a structure of three or more layers.
The multilayer coextruded film has the greatest advantage of containing one or more layers of barrier materials, which are usually Polyamide (PA) and ethylene-vinyl alcohol copolymer (EVOH), and has excellent barrier properties against various gases and water vapor. The multilayer co-extruded film has unique advantages in the aspect of manufacturing the barrier film, and the thickness and the interlayer distribution of the barrier layer material can be adjusted according to requirements.
However, in practical applications, there are often many special requirements for the barrier packaging film, especially various functional requirements for the heat-sealing layer material. For example, a coextruded film is required to be heat-sealed with multiple substrates such as polyethylene, polypropylene or polystyrene, so that a resin material such as ethylene-vinyl acetate polymer which can be heat-sealed with the materials at the same time needs to be used, but the most commonly used heat-sealing layer material in multilayer coextrusion is still polyethylene or polypropylene, other materials are easy to generate the phenomena of stickiness, wrinkling, uncoiling and the like through multilayer coextrusion, and from the viewpoint of cost, the special heat-sealing materials are relatively high in price, and the thickness is difficult to process and achieve to be very thin in coextrusion processing. For example, in some special fields, a film with very low seal-opening temperature and easy-tearing effect is required, and although the functions can be realized by a multilayer co-extrusion process directly, the processing difficulty is quite high, and the cost rise is obvious.
In the application field of the multilayer co-extruded film, a plurality of packages with special requirements are provided, and the requirements cannot be met by adopting the traditional multilayer co-extruded film. Meanwhile, the multilayer co-extrusion process also has the defects of high structure conversion cost and large replacement structure loss, and a part of materials are difficult to process by using the multilayer co-extrusion processing process. Especially, when some special materials are needed on the surface, the direct multilayer co-extrusion cannot be finished. For example. For materials with high corrosion resistance, an acid modified ionic polymer (SURLYN) is used, which cannot be processed in a co-extrusion process at one time. Technically, although the functions can be realized by dry compounding, wet compounding or solvent-free compounding, the compounding technology has the problems of residual solvent, brittle film, high loss and the like. Therefore, there is a need for improved multilayer coextruded film structures and processes
Disclosure of Invention
The invention aims to overcome the defects in the prior art and designs a co-extruded film with improved performance and a preparation method thereof. The method can compound one layer, two layers or more than two layers of resin materials on the surface of the film according to different functional requirements of users on the co-extruded film, and realize various special functions of the film through matching of the layers.
In order to achieve the above purpose, the technical solution of the present invention is to provide a co-extruded film with improved performance, wherein the co-extruded film comprises a co-extruded film structure layer compounded on a plurality of layers of co-extruded films, the compounded structure layer is called a co-extruded film improvement layer or a co-extruded film protection layer, and the co-extruded film improvement layer or the co-extruded film protection layer is used for improving the performance of the co-extruded film or protecting the surface of the co-extruded film.
Wherein the co-extruded film improvement layer or the co-extruded film protection layer is added on any surface or two surfaces of the multi-layer co-extruded film in a coating or film spraying mode.
Wherein, the coating mode is that the co-extruded film improvement layer or the co-extruded film protection layer is uniformly coated on any surface or two surfaces of the co-extruded film by adopting extrusion equipment.
The extrusion equipment can directly coat the co-extruded film improved layer or the co-extruded film protective layer on the surface of the multi-layer co-extruded film, or coat the co-extruded film improved layer or the co-extruded film protective layer on the surface of the multi-layer co-extruded film by the extrusion equipment after printing or coating other coatings.
Wherein, at least one layer of the co-extruded film improved layer or the co-extruded film protective layer is coated on any surface or two surfaces of the multi-layer co-extruded film.
The material of any one of the co-extruded film improvement layer or the co-extruded film protection layer is one or more of Low Density Polyethylene (LDPE), Medium Density Polyethylene (MDPE), High Density Polyethylene (HDPE), Linear Low Density Polyethylene (LLDPE), metallocene polyethylene (mPE), polypropylene (PP), acrylic acid-ethylene copolymer (EAA), methacrylic acid-ethylene copolymer (EMAA), ethacrylic acid-ethylene copolymer (EEAA), ionic polymer (SURLYN), vinyl acetate-ethylene copolymer (EVA), Polybutylene (PB), Polyamide (PA) and ethylene-vinyl alcohol copolymer (EVOH), or the material is formed by mixing the fillers taking the materials as carriers.
The multilayer co-extrusion film is a barrier film manufactured by adopting a multilayer co-extrusion blown film or tape casting method, and the co-extrusion film contains a barrier material.
Wherein, the structure of the multilayer coextruded film is at least 3 layers.
The invention has the advantages and beneficial effects that: the method for improving the performance of the co-extruded film is to add one or more layers of modified materials on the surface of the multi-layer co-extruded film through a coating process, and the compounded materials have certain special functions. Can meet a plurality of special requirements, in particular various functional requirements on the heat sealing layer material. For example, the co-extruded film is required to be heat-sealed with various base materials such as polyethylene, polypropylene or polystyrene, so that a resin material such as ethylene-vinyl acetate polymer which can be heat-sealed with the materials at the same time is required to be used, but the most common heat-sealing layer material in the multi-layer co-extrusion is still polyethylene or polypropylene, other materials are easy to generate the phenomena of stickiness, wrinkling, uncoiling and the like through the multi-layer co-extrusion, and from the cost perspective, the price of the special heat-sealing materials is higher, the thickness is difficult to process and is very thin in the co-extrusion processing, under the condition, an ethylene-vinyl acetate polymer (EVA) layer can be coated on the original polyolefin layer of the multi-layer co-extruded film by adopting an extrusion coating method, the thickness can be accurately controlled below 5 micrometers, so that the heat-sealing performance of various materials is realized, and the process problem is solved, the cost control is also very accurate. For example, in some special fields, a film with very low seal-opening temperature and easy-to-tear effect is required, although the functions can be realized by directly adopting a multi-layer co-extrusion process, the processing difficulty is quite high, the cost rise is obvious, and the purpose is achieved by coating a heat-sealing layer on the surface of the multi-layer co-extrusion film by adopting a coating method.
In the application field of the multilayer co-extruded film, a plurality of packages with special requirements are provided, and the requirements cannot be met by adopting the traditional multilayer co-extruded film. Meanwhile, the multilayer co-extrusion process also has the defects of high structure conversion cost and large replacement structure loss, and a part of materials are difficult to process by using the multilayer co-extrusion processing process. Especially, when some special materials are needed on the surface, the direct multilayer co-extrusion cannot be finished. For example. For materials with high corrosion resistance, an acid modified ionic polymer (SURLYN) is used, which cannot be processed in a co-extrusion process at one time. Technically, although the functions can be realized by dry compounding, wet compounding or solvent-free compounding, the compounding technology has the problems of residual solvent, brittle film, high loss and the like. These problems are perfectly solved by adding one or more layers of heat-seal or protective materials to the surface of the multilayer coextruded film.
The invention provides a method for manufacturing the barrier film with multifunctional heat sealing performance by surface coating or film spraying. The method is to add one or more layers of materials on the surface of the multilayer co-extruded film through a coating process, and the compounded materials have certain special functions. According to different functional requirements, one layer, two layers or more than two layers of resin materials can be compounded on the surface of the film, and multiple functionalities are realized through matching between the layers. This method can be used to coat only one surface of the film or to coat both surfaces of the film. For example, a coextruded film with easy-tear functionality can be made by coating one side of the film with an easy-tear resin layer, and printing the other side followed by coating a layer of polyethylene to protect the ink.
Drawings
FIG. 1 is a schematic view of the structure of a multilayer coextruded film according to example 1 of the invention;
FIG. 2 is a schematic view of the structure of a multilayer coextruded film according to example 2 of the invention;
FIG. 3 is a schematic view of the structure of a multilayer coextruded film according to example 3 of the invention;
FIG. 4 is a schematic structural view of a multilayer coextruded film according to example 4 of the invention;
FIG. 5 is a schematic view of the structure of a multilayer coextruded film according to example 5 of the invention;
FIG. 6 is a schematic view of the structure of a multilayer coextruded film according to example 6 of the invention;
FIG. 7 is a schematic structural view of a multilayer coextruded film of example 7 of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The technical scheme of the specific implementation of the invention is as follows:
example 1:
the structure as shown in the attached figure 1: b is a five-layer co-extruded film which is composed of two layers of polyethylene (B-1 and B-5), a barrier layer of polyamide or ethylene-vinyl alcohol copolymer (B-3) and two layers of bonding materials (B-2 and B-4), a layer of structure C is added on one surface B-5 of B through extrusion coating equipment, and the material of the layer C is ethylene-vinyl acetate copolymer (EVA). The film added with a layer C through extrusion coating contains a functional heat sealing layer C, and the heat sealing layer has the heat sealing performance with various different base materials such as polyethylene, polypropylene or polystyrene. The film produced by this method has both barrier properties and excellent heat-sealing properties.
Example 2:
the structure as shown in figure 2: and B is a seven-layer co-extruded film which is composed of two layers of polyethylene (B-3 and B-7), two barrier layers of polyamide (B-1 and B-5) and three layers of bonding materials (B-2, B-4 and B-6), and has good formability and mechanical strength. Adding a layer of structure C on one surface B-7 of the layer B through extrusion coating equipment, wherein the material of the layer C is ethylene-vinyl acetate copolymer (EVA). The film added with a layer C through extrusion coating contains a functional heat sealing layer C, and the heat sealing layer has the heat sealing performance with various different base materials such as polyethylene, polypropylene or polystyrene. The film produced by this method combines barrier properties, formability and mechanical strength with a wide range of heat sealability.
Example 3:
the structure as shown in figure 3: the B is a seven-layer co-extruded film which is composed of four layers of polyethylene (B-1, B-2, B-6 and B-7), a barrier layer of polyamide or ethylene-vinyl alcohol copolymer (B-4) and two layers of binding materials (B-3 and B-5), and the seven-layer co-extruded film has good barrier property. Adding two layers of structures C-1 and C-2 on one surface B-7 of the B through extrusion coating equipment, wherein C-1 is polyethylene, and C-2 is an ionic polymer. The prepared film takes C-2 as a heat sealing layer, and the ionic polymer (SURLYN) has excellent heat sealing window and hot adhesion strength, is particularly suitable for high-speed packaging, and can be sealed with glass and metal. By extrusion coating C-1, cost reduction can be achieved while ensuring performance. The film added with a layer C through extrusion coating contains a functional heat sealing layer C, and the heat sealing layer has the heat sealing performance with various different base materials such as polyethylene, polypropylene or polystyrene. The film produced by this method combines barrier properties, formability and mechanical strength with a wide range of heat sealability.
Example 4:
the structure as shown in figure 4: and B is a nine-layer co-extruded film which is composed of four layers of polyethylene (B-1, B-2, B-3 and B-9), a barrier layer of ethylene-vinyl alcohol copolymer (B-6), two layers of reinforced layer polyamide (B-5 and B-7) and two layers of bonding materials (B-4 and B-8), and has good barrier property and mechanical strength. When the printed package is manufactured, a Ink (printing layer) is printed on one surface B-1, so that after the printing is carried out on the surface B-1, a layer C-3 is added on the printing ink through extrusion coating equipment, the layer C-3 is made of polyethylene, and two layers of structures C-1 and C-2 are added on the other surface B-9, wherein the layer C-1 is low-density polyethylene, and the layer C-2 is an ionic polymer. The film prepared in the example has C-2 as a heat sealing layer, and the ionic polymer (SURLYN) has excellent heat sealing window and hot-tack strength, is particularly suitable for high-speed packaging, and can be sealed with glass and metal. By extrusion coating C-1, cost reduction can be achieved while ensuring performance. Meanwhile, the C-3 layer added on the B-1 printing surface effectively protects the printing layer and provides the most well-held food safety performance protection performance, and the film has incomparable advantages in aspects of high barrier performance, mechanical strength, printing attractiveness, wide sealing performance, high-speed packaging adaptability and the like.
Example 5:
the structure as shown in figure 5: and B is an eight-layer co-extruded film which is composed of two layers of polyethylene (B-7 and B-8), three layers of reinforced polyamide (B-1, B-3 and B-5) and two layers of bonding materials (B-2 and B-6), and has good barrier property and mechanical strength. However, the film with such a structure is very easy to curl due to the great difference in crystallinity between polyamide and polyethylene, and the application of the film is seriously affected. A layer C is added on the PE surface B-8 of the eight-layer co-extruded film through extrusion coating equipment, the material of the layer C is ethylene-vinyl acetate copolymer, and since vinyl acetate is non-crystalline polymer, after a layer with very low crystallinity is added, the crystallinity of the new surface layer C of the film is close to that of the other surface layer B-1, so that the curling degree of the film is greatly improved, and the flatness of the film is improved.
Example 6:
the structure as shown in figure 6: the B is a seven-layer co-extruded film which is composed of two layers of polyethylene (B-1 and B-7), two layers of reinforced layer polyamide (B-3 and B-5) and three layers of bonding materials (B-2, B-4 and B-6). Two layers are added on two surfaces B-1 and B-7 of the seven-layer co-extruded film through extrusion coating equipment, C-1 and C-2 are added on the surface B-1, C-3 and C-4 are added on the surface B-7, the new film is a eleven-layer film, two surfaces of the new film are ethylene-vinyl acetate copolymer, the film can be sealed with the surfaces of other substrates at extremely low temperature, and the flatness, transparency and mechanical property of the film have obvious advantages.
Example 7:
the structure as shown in figure 7: the B is a seven-layer co-extruded film which is composed of four layers of polyethylene (B-1, B-2, B-6 and B-7), a barrier layer of polyamide or ethylene-vinyl alcohol copolymer (B-4) and two layers of binding materials (B-3 and B-5), and the seven-layer co-extruded film has good barrier property. And adding three-layer structures C-1, C-2 and C-3 on one surface B-7 of the B through an extrusion coating device, wherein C-1 is a bonding layer material, C-2 is ethylene vinyl alcohol copolymer (EVOH), and C-3 is Polyamide (PA). The prepared film is added with a barrier layer C-2 and a surface protection layer C-3 through film coating. The co-extruded film has barrier property, good mechanical stability and flatness.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. The performance-improved co-extruded film is characterized by comprising a co-extruded film structure layer compounded on a plurality of layers of co-extruded films, wherein the compounded structure layer is called as a co-extruded film improved layer or called as a co-extruded film protective layer, and the co-extruded film improved layer or the co-extruded film protective layer is used for improving the performance of the co-extruded film or protecting the surface of the co-extruded film.
2. The coextruded film of claim 1 wherein the coextruded film modified layer or coextruded film protective layer is laminated to either or both surfaces of the multilayer coextruded film by coating or laminating.
3. The coextruded film of claim 2 wherein at least one of the coextruded film enhancement layer or coextruded film protective layer applied to either or both surfaces of the multilayer coextruded film.
4. The coextruded film of claim 3, wherein the material of any of the coextruded film improvement layer or coextruded film protection layer is one or more of low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, metallocene polyethylene, polypropylene, acrylic acid-ethylene copolymer, methacrylic acid-ethylene copolymer, ethacrylic acid-ethylene copolymer, ionic polymer, vinyl acetate-ethylene copolymer, polybutylene, polyamide, ethylene-vinyl alcohol copolymer, or a mixture of fillers carried by the above materials.
5. The coextruded film according to claim 4, wherein the multilayer coextruded film comprises a barrier film formed by multilayer coextrusion blown film or multilayer coextrusion cast film, and the coextruded film further comprises a barrier material.
6. The coextruded film of any of claims 1 to 5 wherein the multilayer coextruded film has a structure of at least 3 layers.
7. The preparation method of the co-extruded film as claimed in any one of claims 1 to 6, wherein the method comprises the step of adding a structural layer of the co-extruded film on the surface of the multi-layer co-extruded film by means of coating or film spraying, wherein the added structural layer is called a co-extruded film improvement layer or a co-extruded film protection layer, and the co-extruded film improvement layer or the co-extruded film protection layer is used for improving the performance of the co-extruded film or protecting the surface of the co-extruded film.
8. The method of claim 7, wherein the coating is performed by uniformly coating the coextruded film modified layer or the coextruded film protective layer on either or both surfaces of the coextruded film using an extrusion apparatus.
9. The method of claim 8, wherein the extrusion device directly coats the surface of the multilayer coextruded film with the coextruded film improved layer or the coextruded film protective layer, or coats the surface of the multilayer coextruded film with the coextruded film improved layer or the coextruded film protective layer by the extrusion device after printing or coating other coating layers on the surface of the multilayer coextruded film.
10. The method of claim 8 or 9, wherein at least one of the coextruded film improvement layer or coextruded film protection layer is applied to either or both surfaces of the multilayer coextruded film.
CN201811117913.6A 2018-09-14 2018-09-14 Co-extruded film with improved performance and preparation method thereof Withdrawn CN110901190A (en)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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CN110901190A true CN110901190A (en) 2020-03-24

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