CN105034503A - High-air-barrier-property multilayer-co-extrusion packaging film - Google Patents

High-air-barrier-property multilayer-co-extrusion packaging film Download PDF

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Publication number
CN105034503A
CN105034503A CN201510264304.3A CN201510264304A CN105034503A CN 105034503 A CN105034503 A CN 105034503A CN 201510264304 A CN201510264304 A CN 201510264304A CN 105034503 A CN105034503 A CN 105034503A
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China
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layer
packaging film
sandwich layer
sandwich
core layer
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冯春
史保利
刘建平
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Suzhou Tianhe New Material Science & Technology Co Ltd
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Suzhou Tianhe New Material Science & Technology 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
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different 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
    • 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
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/406—Bright, glossy, shiny 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
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • 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
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • 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
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • 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
    • B32B2307/7242—Non-permeable
    • B32B2307/7246—Water vapor barrier
    • 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
    • B32B2323/00—Polyalkenes
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B32B2323/046—LDPE, i.e. low density polyethylene
    • 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
    • B32B2327/00—Polyvinylhalogenides
    • 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
    • B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
    • 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
    • B32B2377/00—Polyamides

Landscapes

  • Laminated Bodies (AREA)

Abstract

The invention discloses a high-air-barrier-property multilayer-co-extrusion packaging film which includes a surface layer, an inner layer and a core layer. The core layer includes a first core layer, a second core layer and a third core layer, which are generated through co-extrusion composition, according to the thickness ratio of (1-3):(1-5):(1-4). Adhesive layers are used for respectively bonding the first core layer with the surface layer and the third core layer with the inner layer. The first core layer is a polyamide layer, the second core layer is an ethylene-vinyl alcohol co-polymer layer and the third core layer is a polyvinylidene chloride layer. The third core layer includes a mixture composed of 98 wt% of polyvinylidene chloride and 2 wt% of a processing aid, wherein the polyvinylidene chloride is a vinylidene chloride-maleic anhydride co-polymer, is 150 DEG C in melt point and is 1.7 g/cm<3> in density, and the processing aid is epoxidized soybean oil. In the invention, a polyvinylidene chloride core layer which is single in the prior art is improved, wherein the core layer is formed by compositing three functional core layers including polyamide, the ethylene-vinyl alcohol co-polymer and the polyvinylidene chloride according to the certain thickness ratio, so that the packaging film can improve air-barrier property and is further reduced in production cost by 25-30%.

Description

High gas-obstructing character multi-layer co-extrusion packaging film
Technical field
The present invention relates to a kind of high gas-obstructing character multi-layer co-extrusion packaging film.
Background technology
The packaging of commodity for commodity storage, transport, guarantee the quality, beautify there is important function.Traditional manner of packing is packed in cases and enlacement packaging mainly.But along with the progress of expanding economy, science and technology, the with rapid changepl. never-ending changes and improvements of product, and the life of people is tending towards convenient and leisure more, there has also been higher requirement to the packaging of product.Based on this, along with the appearance of new material, people start to adopt polyethylene (PE) packaging film to replace packed in cases and to tie up, have save material, reduce costs, protection against the tide, health, plurality of advantages easy to use, but lack excellent gas barrier property.Especially pack as the smells such as flavouring, tomato sauce, pasta, meat products, cheese product, finished fruit and vegetable, beverage, chemicals, medical product comparatively greatly, food (medicine) product that needs barrier to protect time, defect is obvious.
On the basis of polyethylene (PE) packaging film, also improve out multi-layer co-extrusion packaging film for this reason, this film comprises top layer, internal layer and sandwich layer usually, top layer is generally wearability, smoothness, material that processability is good, usual employing metallocene polyethylene material is as top layer (such as metallocene LLDPE or metallocene VLDPE), but expose following problem: add and extrude moment of torsion comparatively large and pressure man-hour and raise, output cannot improve, and also there will be melt body fragmentation affects product packaging effects, transparency and outward appearance.Internal layer many employings polythene material, also includes the polyolefin based materials possessing certain bonding characteristics and heat shrinkability characteristic, such as LDPE, LLDPE, VLDPE, ULDE, SURLYN, EVA etc., guarantees tightly to stick product by after thermal softening.
Sandwich layer is the major function layer intercepting gas and smell, barrier propterty for packaging film plays crucial effect, the sandwich layer of all kinds of multi-layer co-extrusion packaging films in the market all adopts the gas barrier material (such as PVF polyvinylidenechloride or ethylene-vinyl alcohol copolymer) of simple layer, although possess certain gas barrier function, but shortcoming is inefficiency, and expensive raw material price.Especially, when the polyvinylidene chloride of single raw material is wanted to reach good obstruct usefulness, it often needs the thickness increasing functional layer, increases production cost further undoubtedly like this; And the functional layer of gas barrier material also can affect the use of top layer and internal layer raw material after occupying larger ratio, thus reduce as the heat sealability of the inner layer material of (heat-sealing) shrinkage layer, shrinkage and heat seal strength, the due usefulness of reduction top layer raw material simultaneously.And single sandwich layer (such as PVF polyvinylidenechloride, the impact strength of itself, paracentesis resistance, lower temperature resistance, adhesion-resistant slippery and bag, pollution resistance, optical property and transparency all poor, affect the lifting of packaging film total quality.
Summary of the invention
The present invention seeks to: a kind of high gas-obstructing character multi-layer co-extrusion packaging film is provided, be intended to effectively solve the defect that co-extrusion packaging film barrier properties for gases is poor, manufacturing cost is high adopting single sandwich layer at present.
Technical scheme of the present invention is: a kind of high gas-obstructing character multi-layer co-extrusion packaging film, comprise top layer, internal layer and the sandwich layer between them, it is characterized in that the first sandwich layer that described sandwich layer comprises coextru-lamination and generate, the second sandwich layer and the 3rd sandwich layer, the Thickness Ratio of first, second and third sandwich layer is (1 ~ 3): (1 ~ 5): (1 ~ 4); Wherein between the first sandwich layer and top layer, and the 3rd sandwich layer and interior interlayer all bond by adhesive layer; And the first described sandwich layer is aramid layer; Second sandwich layer is evoh layer; 3rd sandwich layer is polyvinylidene chloride layer, comprises the mixture be made up of the polyvinylidene chloride of 98Wt% and the processing aid of 2Wt%, and described polyvinylidene chloride is vinylidene chloride-maleic anhydride compound, fusing point 150 DEG C, density 1.7g/cm 3, described processing aid is epoxidized soybean oil.
Further, top layer described in the present invention is one or both mixtures in any proportion in polyamide, polyolefin and polyester.
Further, top layer described in the present invention comprises polyamide, polyolefin and polyester, and the weight range of polyamide is 20% ~ 40%, and polyolefinic weight range is 0% ~ 40%, and the weight range of polyester is 40% ~ 80%.
Further, polyolefin described in the present invention comprises resin a and resin b, and wherein the weight content scope of resin a is 0% ~ 60%, and the weight content scope of resin b is 40% ~ 100%; Described resin a density is 0.88 ~ 0.917g/cm 3, be the mixture of ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, wherein alhpa olefin is propylene, butylene, hexene-1 or octene-1, and weight content is 1% ~ 20%; Described resin b is the copolymer of ethene and methacrylic acid, acrylic acid, vinylacetate, butyl acrylate or ethyl acrylate, and wherein the weight content of carboxylic acid monomer is 5% ~ 25%.
Further, internal layer described in the present invention is polyethylene layer, comprises the mixture of one or more in LLDPE, ultra-low density polyethylene, linear density polyethylene, density 0.90 ~ 0.92g/cm 3, melt index is 0.35 ~ 0.78g/10min.
Further, the gross thickness of the first sandwich layer described in the present invention, the second sandwich layer and the 3rd sandwich layer is 9 ~ 15 microns.
Further, the thickness on top layer described in the present invention is 8 ~ 10 microns, and the thickness range of internal layer is 19 ~ 24 microns, and the thickness of described every layer of adhesive layer is 3 ~ 5 microns.
Further, adhesive layer described in the present invention comprises ethylene-vinyl acetate copolymer or maleic anhydride modified ethene polymers, when comprising ethylene-vinyl acetate copolymer, in ethylene-vinyl acetate copolymer, the weight percentage of vinylacetate is 5% ~ 25%, and density is 0.93 ~ 0.94g/cm 3.
Advantage of the present invention is:
1, technical solution of the present invention overcomes the defect that when conventional multilayer co-extrusion packaging film adopts single polyvinylidene chloride sandwich layer, barrier properties for gases is poor, cost is high; It carrys out composite polyamide, ethylene-vinyl alcohol copolymer and polyvinylidene chloride three kinds of function sandwich layers by certain thickness ratio, under guaranteeing the prerequisite of excellent gas barrier property, decrease the utilization of single polyvinylidene chloride, reduce further production cost (cost savings reach 25 ~ 30%) and market price, improve product competitiveness in the market, bring very considerable economic benefit.
2, the invention belongs to the vacuum packaging material of improvement air barrier performance, especially when applying to that the smells such as flavouring, tomato sauce, pasta, meat products, cheese product, finished fruit and vegetable, beverage, chemicals, medical product are comparatively large, food (medicine) product that needs barrier protect time produce extraordinary effect, gas barrier property lifting 10 ~ 15%; In the gas barrier experiment of meat products, cheese product, the gas permeation rate (transmission coefficient) of oxygen, water vapour declines 30 ~ 45%.
3, technical scheme of the present invention is equivalent to introduce polyamide and ethylene-vinyl alcohol copolymer in originally single polyvinylidene chloride sandwich layer, the impact strength of sandwich layer can be improved, paracentesis resistance, lower temperature resistance, adhesion-resistant slippery and bag, pollution resistance, optical property and transparency, promote packaging film total quality.
4, the present invention improves the skin-material of multi-layer co-extrusion packaging film simultaneously, eliminate the use of metallocene polyethylene material, overcome original packaging film and extrude moment of torsion greatly, output is little, and easily melt body fragmentation (low temperature is crisp) affects attractive in appearance and defect that is intensity.And guarantee that top layer has special performance by the ratio of hybrid limited polyamide, polyolefin and polyester in the scheme of improvement, as the impact strength of excellence, paracentesis resistance, lower temperature resistance, low volatility, adhesion-resistant slippery and bag; Possess certain heat sealability, good pollution resistance, optical property, transparency is better, and good barrier properties for gases simultaneously.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is the cross section structure schematic diagram of high gas-obstructing character multi-layer co-extrusion packaging film of the present invention;
Wherein: 1, top layer; 2, the first sandwich layer; 3, the second sandwich layer; 4, the 3rd sandwich layer; 5, internal layer; 6, adhesive layer.
Detailed description of the invention
As described in Figure 1, high gas-obstructing character multi-layer co-extrusion packaging film of the present invention, general introduction, in seven-layer structure, comprises top layer 1, internal layer 5, first sandwich layer 2, second sandwich layer 3 and the 3rd sandwich layer 4, wherein all bonds by adhesive layer 6 between the first sandwich layer 2 and top layer 1, between the 3rd sandwich layer 4 and internal layer 5.The thickness on described top layer 1 is 8 ~ 10 microns, and the thickness range of internal layer 5 is 19 ~ 24 microns, and the thickness of described every layer of adhesive layer 6 is 3 ~ 5 microns.And the gross thickness of the first sandwich layer 2, second sandwich layer 3 and the 3rd sandwich layer 4 is 9 ~ 15 microns, and the Thickness Ratio of the first sandwich layer 2, second sandwich layer 3 and the 3rd sandwich layer 4 is (1 ~ 3): (1 ~ 5): (1 ~ 4).
The first described sandwich layer 2 is aramid layer, and described second sandwich layer 3 is evoh layer; Described 3rd sandwich layer 4 is polyvinylidene chloride layer, comprises the mixture be made up of the polyvinylidene chloride of 98Wt% and the processing aid of 2Wt%, and described polyvinylidene chloride is vinylidene chloride-maleic anhydride compound, fusing point 150 DEG C, density 1.7g/cm 3, described processing aid is epoxidized soybean oil.
Described top layer 1 is one or both mixtures in any proportion in polyamide, polyolefin and polyester.Or described top layer comprises polyamide, polyolefin and polyester, the weight range of polyamide is 20% ~ 40%, and polyolefinic weight range is 0% ~ 40%, and the weight range of polyester is 40% ~ 80%.Wherein said polyolefin comprises resin a and resin b, and wherein the weight content scope of resin a is 0% ~ 60%, and the weight content scope of resin b is 40% ~ 100%; Described resin a density is 0.88 ~ 0.917g/cm 3, be the mixture of ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, wherein alhpa olefin is propylene, butylene, hexene-1 or octene-1, and weight content is 1% ~ 20%; Described resin b is the copolymer of ethene and methacrylic acid, acrylic acid, vinylacetate, butyl acrylate or ethyl acrylate, and wherein the weight content of carboxylic acid monomer is 5% ~ 25%.Described internal layer 5 is polyethylene layer, comprises the mixture of one or more in LLDPE, ultra-low density polyethylene, linear density polyethylene, density 0.90 ~ 0.92g/cm 3, melt index is 0.35 ~ 0.78g/10min.
Described adhesive layer 6 comprises ethylene-vinyl acetate copolymer or maleic anhydride modified ethene polymers, when comprising ethylene-vinyl acetate copolymer, in ethylene-vinyl acetate copolymer, the weight percentage of vinylacetate is 5% ~ 25%, and density is 0.93 ~ 0.94g/cm 3.
This packaging film has good oxygen and water vapor barrier, high shrinkage factor, good resistance tocrocking, heat sealability and puncture resistance, be especially suitable for the fresh-keeping packaging of food (medicine) product that is as comparatively large in smells such as flavouring, tomato sauce, pasta, meat products, cheese product, finished fruit and vegetable, beverage, chemicals, medical products, that need barrier to protect.
Embodiment 1
Shown in composition graphs 1, the high gas-obstructing character multi-layer co-extrusion packaging film of the present embodiment, top layer 1 thickness: 8 microns, internal layer 5 thickness 19 microns, the thickness of the first sandwich layer 2, second sandwich layer 3 and the 3rd sandwich layer 4 is 3 microns, and adhesive layer 6 thickness is 3 microns.
Each layer raw material, top layer 1: polyamide 80kg; First sandwich layer 2: polyamide 50kg; Second sandwich layer 3: evoh layer 100kg; 3rd sandwich layer 4:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm 3) and the epoxidized soybean oil of 2kg; Internal layer 5: LLDPE 50kg, density 0.90g/cm 3, melt index is 0.35g/10min; The raw material of each layer adhesive layer 6 is identical, is 5kg ethylene-vinyl acetate copolymer, density 0.93g/cm 3.
The extruder that each layer raw material adds each layer is respectively carried out fusion plastification, then enters a multi-layer co-extruded circular die and carry out the distribution of melt thus form the circular melt pipe of a multilayer; Circular melt pipe carries out entering hot water storgae after cooling forming through vacuum sizing and carries out being heated to the suitable temperature propelled the price of, and is filled with compressed air and carries out horizontal inflation and longitudinal stretching between two pairs of nip rolls; Former film after shaping carries out rolling after heat-treating, and then carries out radiation treatment and is filmed after certain dosage.
Embodiment 2
Shown in Figure 1, the high gas-obstructing character multi-layer co-extrusion packaging film of the present embodiment, top layer 1 thickness: 9 microns, internal layer 5 thickness 20 microns, the first sandwich layer 2 thickness is 3 microns, and the second sandwich layer 3 thickness is 5 microns, the thickness of the 3rd sandwich layer 4 is 4 microns, and adhesive layer 6 thickness is 4 microns.
Each layer raw material, top layer 1: polyolefin is 100kg, specifically 60kg ethylene-alpha-olefin copolymer (alhpa olefin is propylene) altogether, and density is 0.88g/cm 3, and the ethylene-methacrylic acid copolymer of 40kg;
First sandwich layer 2: polyamide 40kg; Second sandwich layer 3: evoh layer 80kg; 3rd sandwich layer 4:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm 3) and the epoxidized soybean oil of 2kg; Internal layer 5: the mixture of LLDPE 40kg and linear density polyethylene 60kg, density 0.915g/cm 3, melt index is 0.55g/10min; The raw material of each layer adhesive layer 6 is identical, is the maleic anhydride modified ethene polymers of 5kg.
Preparation method is identical with embodiment 1.
Embodiment 3
Shown in Figure 1, the high gas-obstructing character multi-layer co-extrusion packaging film of the present embodiment, top layer 1 thickness: 10 microns, internal layer 5 thickness 24 microns, the thickness of the first sandwich layer 2, second sandwich layer 3 and the 3rd sandwich layer 4 is 5 microns, and adhesive layer 6 thickness is 5 microns.
Each layer raw material, top layer 1: polyamide 40kg, polyolefin 40kg, polyester 60kg (PET), wherein polyolefin specifically 10kg ethylene-alpha-olefin copolymer (alhpa olefin is hexene-1), density is 0.90g/cm 3, and the ethylene-vinyl acetate copolymer of 30kg;
First sandwich layer 2: polyamide 50kg; Second sandwich layer 3: evoh layer 100kg; 3rd sandwich layer 4:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm 3) and the epoxidized soybean oil of 2kg; Internal layer 5: the mixture of ultra-low density polyethylene 35kg and linear density polyethylene 25kg, density 0.915g/cm after mixing 3, melt index is 0.55g/10min; The raw material of each layer adhesive layer 6 is identical, is 20kg ethylene-vinyl acetate copolymer, density 0.94g/cm 3.
Preparation method is identical with embodiment 1.
Embodiment 4
Shown in Figure 1, the high gas-obstructing character multi-layer co-extrusion packaging film of the present embodiment, top layer 1 thickness: 9 microns, internal layer 5 thickness 22 microns, the thickness of the first sandwich layer 2 is 3 microns, and the thickness of the second sandwich layer 3 is 6 microns, the thickness of the 3rd sandwich layer 4 is 4.5 microns, and adhesive layer 6 thickness is 4 microns.
Each layer raw material, top layer 1: polyamide 6 0kg and polyester 40kg (PET);
First sandwich layer 2: polyamide 40kg; Second sandwich layer 3: evoh layer 80kg; 3rd sandwich layer 4:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm 3) and the epoxidized soybean oil of 2kg; Internal layer 5: LLDPE 50kg, density 0.90g/cm 3, melt index is 0.35g/10min; The raw material of each layer adhesive layer 6 is identical, is 5kg ethylene-vinyl acetate copolymer, density 0.93g/cm 3.
Preparation method is identical with embodiment 1.
Embodiment 5
Shown in Figure 1, the high gas-obstructing character multi-layer co-extrusion packaging film of the present embodiment, top layer 1 thickness: 10 microns, internal layer 5 thickness 24 microns, the thickness of the first sandwich layer 2 is 3.5 microns, and the thickness of the second sandwich layer 3 is 4.5 microns, the thickness of the 3rd sandwich layer 4 is 4.5 microns, and adhesive layer 6 thickness is 5 microns.
Each layer raw material, top layer 1: polyamide 20kg, polyolefin 40kg, polyester 80kg (PET), wherein polyolefin specifically 15kg ethylene-alpha-olefin copolymer (alhpa olefin is butylene, and density is 0.90g/cm 3, and the ethylene-butyl acrylate copolymer of 25kg;
First sandwich layer 2: polyamide 50kg; Second sandwich layer 3: evoh layer 100kg; 3rd sandwich layer 4:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm 3) and the epoxidized soybean oil of 2kg; Internal layer 5: linear density polyethylene 50kg, density 0.92g/cm 3, melt index is 0.70g/10min; The raw material of each layer adhesive layer 6 is identical, is the maleic anhydride modified ethene polymers of 5kg.
Preparation method is identical with embodiment 1.
After testing, the barrier properties for gases laboratory test results of the conventional multilayer co-extrusion packaging film (single sandwich layer polyvinylidene chloride) of above-mentioned 5 embodiments and current commercial type sees the following form:
After testing, every physical parameter of the conventional multilayer co-extrusion packaging film (single sandwich layer polyvinylidene chloride) of above-mentioned 5 embodiments and current commercial type detects and sees the following form:
Except above-mentioned experiment, high gas-obstructing character multi-layer co-extrusion packaging film of the present invention, it is in lower temperature resistance, volatility, and adhesion-resistant slippery, bag and pollution resistance aspect are also all better than current like product on the market.
Below be only embody rule example of the present invention, protection scope of the present invention is not constituted any limitation.The technical scheme that all employing equivalents or equivalence are replaced and formed, all drops within the claims in the present invention protection domain.

Claims (8)

1. a high gas-obstructing character multi-layer co-extrusion packaging film, comprise top layer (1), internal layer (5) and the sandwich layer between them, it is characterized in that the first sandwich layer (2) that described sandwich layer comprises coextru-lamination and generate, the second sandwich layer (3) and the 3rd sandwich layer (4), the Thickness Ratio of first, second and third sandwich layer (2,3,4) is (1 ~ 3): (1 ~ 5): (1 ~ 4); Wherein between the first sandwich layer (2) and top layer (1), and all bond by adhesive layer (6) between the 3rd sandwich layer (4) and internal layer (5); And described the first sandwich layer (2) is aramid layer; Second sandwich layer (3) is evoh layer; 3rd sandwich layer (4) is polyvinylidene chloride layer, comprise the mixture be made up of the polyvinylidene chloride of 98Wt% and the processing aid of 2Wt%, described polyvinylidene chloride is vinylidene chloride-maleic anhydride compound, fusing point 150 DEG C, density 1.7g/cm 3, described processing aid is epoxidized soybean oil.
2. high gas-obstructing character multi-layer co-extrusion packaging film according to claim 1, is characterized in that described top layer (1) is polyamide, one or both mixtures in any proportion in polyolefin and polyester.
3. high gas-obstructing character multi-layer co-extrusion packaging film according to claim 1, it is characterized in that described top layer (1) comprises polyamide, polyolefin and polyester, the weight range of polyamide is 20% ~ 40%, polyolefinic weight range is 0% ~ 40%, and the weight range of polyester is 40% ~ 80%.
4. the high gas-obstructing character multi-layer co-extrusion packaging film according to Claims 2 or 3, is characterized in that; Described polyolefin comprises resin a and resin b, and wherein the weight content scope of resin a is 0% ~ 60%, and the weight content scope of resin b is 40% ~ 100%; Described resin a density is 0.88 ~ 0.917g/cm 3, be the mixture of ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, wherein alhpa olefin is propylene, butylene, hexene-1 or octene-1, and weight content is 1% ~ 20%; Described resin b is the copolymer of ethene and methacrylic acid, acrylic acid, vinylacetate, butyl acrylate or ethyl acrylate, and wherein the weight content of carboxylic acid monomer is 5% ~ 25%.
5. high gas-obstructing character multi-layer co-extrusion packaging film according to claim 1, it is characterized in that described internal layer (5) is polyethylene layer, comprise the mixture of one or more in LLDPE, ultra-low density polyethylene, linear density polyethylene, density 0.90 ~ 0.92g/cm 3, melt index is 0.35 ~ 0.78g/10min.
6. high gas-obstructing character multi-layer co-extrusion packaging film according to claim 1, is characterized in that described first sandwich layer (2), the gross thickness of the second sandwich layer (3) and the 3rd sandwich layer (4) is 9 ~ 15 microns.
7. the high gas-obstructing character multi-layer co-extrusion packaging film according to claim 1 or 6, it is characterized in that the thickness on described top layer (1) is 8 ~ 10 microns, the thickness range of internal layer (5) is 19 ~ 24 microns, and the thickness of described every layer of adhesive layer (6) is 3 ~ 5 microns.
8. high gas-obstructing character multi-layer co-extrusion packaging film according to claim 1, it is characterized in that described adhesive layer (6) comprises ethylene-vinyl acetate copolymer or maleic anhydride modified ethene polymers, when comprising ethylene-vinyl acetate copolymer, in ethylene-vinyl acetate copolymer, the weight percentage of vinylacetate is 5% ~ 25%, and density is 0.93 ~ 0.94g/cm 3.
CN201510264304.3A 2015-05-22 2015-05-22 High-air-barrier-property multilayer-co-extrusion packaging film Pending CN105034503A (en)

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CN107017360A (en) * 2017-04-19 2017-08-04 苏州度辰新材料有限公司 Lithium battery is packed for the preparation method of aluminum plastic film
CN111409317A (en) * 2020-03-30 2020-07-14 北京邦维高科特种纺织品有限责任公司 Flame-retardant, anti-toxic and high-temperature-resistant polypropylene co-extrusion film and preparation method thereof
CN113580703A (en) * 2021-06-09 2021-11-02 浙江金仪盛世生物工程有限公司 Film material for multilayer co-extrusion disposable biological process bag

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CN101073403B (en) * 2006-05-17 2013-02-06 科伍德有限公司 Packaging products, film and method for improving and keeping meat color desired for person
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Publication number Priority date Publication date Assignee Title
CN107017360A (en) * 2017-04-19 2017-08-04 苏州度辰新材料有限公司 Lithium battery is packed for the preparation method of aluminum plastic film
CN111409317A (en) * 2020-03-30 2020-07-14 北京邦维高科特种纺织品有限责任公司 Flame-retardant, anti-toxic and high-temperature-resistant polypropylene co-extrusion film and preparation method thereof
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CN113580703A (en) * 2021-06-09 2021-11-02 浙江金仪盛世生物工程有限公司 Film material for multilayer co-extrusion disposable biological process bag

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