CN204977676U - High -barrier multi -layer co -extrusion packaging film - Google Patents
High -barrier multi -layer co -extrusion packaging film Download PDFInfo
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- CN204977676U CN204977676U CN201520337667.0U CN201520337667U CN204977676U CN 204977676 U CN204977676 U CN 204977676U CN 201520337667 U CN201520337667 U CN 201520337667U CN 204977676 U CN204977676 U CN 204977676U
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Abstract
The utility model discloses a high -barrier multi -layer co -extrusion packaging film, including top layer, inlayer and sandwich layer, its characterized in that the sandwich layer contains by the first sandwich layer of bond line mutual adhesion and second sandwich layer, wherein between first sandwich layer and the top layer to and also all adhere by the bond line between second sandwich layer and inlayer, and the thickness of first sandwich layer and second sandwich layer is than being 1: 1-3: 4, wherein: first sandwich layer be the polyethylene layer, the second sandwich layer is the polyvinylidene chloride layer. The utility model discloses under ensureing good gas barrier property's prerequisite, manufacturing cost (the cost saving reaches 25-30%) has further been reduced.
Description
Technical field
The utility model relates to a kind of high-barrier 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 utility model object is: provide a kind of high-barrier multi-layer co-extrusion packaging film, is 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-barrier multi-layer co-extrusion packaging film, comprise top layer, internal layer and the sandwich layer between them, it is characterized in that described sandwich layer comprises the first sandwich layer and the second sandwich layer mutually bonded by adhesive layer, wherein between the first sandwich layer and top layer, and the second sandwich layer and interior interlayer also all bond by adhesive layer; And the Thickness Ratio of the first sandwich layer and the second sandwich layer is 1:1 ~ 3:4; Wherein: the first described sandwich layer is polyethylene layer, described second sandwich layer is polyvinylidene chloride layer.
Further, top layer described in the utility model is the one in aramid layer, polyolefin layer and polyester layer, or two kinds of mixed layers mixed in any proportion in polyamide, polyolefin and polyester.
Further, top layer described in the utility model 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 utility model 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 utility model 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.
Further, the gross thickness of the first sandwich layer and the second sandwich layer described in the utility model is 6 ~ 11 microns.
Further, the thickness on top layer described in the utility model 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 utility model 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.
Further, described in the utility model, the melt index of the polyethylene layer of the first sandwich layer and the polyethylene layer of internal layer is 0.35 ~ 0.78g/10min.
Further, the first sandwich layer described in the utility model is the mixed layer of one or more mixing in linear low density polyethylene layer, ultra-low density polyethylene layer, linear density polyethylene layer, density 0.90 ~ 0.92g/cm
3; Described second core layer raw material can be the polyvinylidene chloride of single component, such as vinylidene chloride-maleic anhydride compound layer, certainly the mixture be made up of the processing aid (epoxidized soybean oil) of the vinylidene chloride of 98Wt%-maleic anhydride compound and 2Wt% can also actually be comprised, fusing point 150 DEG C, density 1.7g/cm
3.
The utility model has the advantages that:
1, technical solutions of the utility model overcome 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 adopts double-deck sandwich layer, and the thickness proportion both controlling, 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 utility model 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, the technical solution of the utility model is equivalent to introduce polythene material 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 utility model 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 utility model is further described:
Fig. 1 is the cross section structure schematic diagram of the utility model high-barrier multi-layer co-extrusion packaging film;
Wherein: 1, top layer; 2, the first sandwich layer; 3, the second sandwich layer; 4, internal layer; 5, adhesive layer.
Detailed description of the invention
As described in Figure 1, high-barrier multi-layer co-extrusion packaging film of the present utility model, general introduction is in seven-layer structure, comprise top layer 1, internal layer 4, first sandwich layer 2 and the second sandwich layer 3, wherein between the first sandwich layer 2 and top layer 1, between the second sandwich layer 3 and internal layer 4, and all bond by adhesive layer 5 between two-layer sandwich layer 2,3.The thickness on described top layer 1 is 8 ~ 10 microns, and the thickness range of internal layer 4 is 19 ~ 24 microns, and the thickness of described every layer of adhesive layer 5 is 3 ~ 5 microns.And the gross thickness of the first sandwich layer 2 and the second sandwich layer 3 is 4 ~ 11 microns, and the Thickness Ratio of the first sandwich layer 2 and the second sandwich layer 3 is 1:2 ~ 3:4.
The first described sandwich layer 2 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; Described second sandwich layer 3 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 4 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.
Described adhesive layer 5 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.
The melt index of the described polyethylene layer of the first sandwich layer 2 and the polyethylene layer of internal layer 4 is 0.35 ~ 0.78g/10min.
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-barrier multi-layer co-extrusion packaging film of the present embodiment, top layer 1 thickness: 8 microns, internal layer 4 thickness 19 microns, the first sandwich layer 2 and the second sandwich layer 3 thickness are 4 microns, and adhesive layer 5 thickness is 3 microns.
Each layer raw material, top layer 1: aramid layer 80kg; First sandwich layer 2: linear low density polyethylene layer 50kg, density 0.90g/cm
3, melt index is 0.35g/10min; Second sandwich layer 3:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm
3) and the epoxidized soybean oil of 2kg; Internal layer 4: linear low density polyethylene layer 50kg, density 0.90g/cm
3, melt index is 0.35g/10min; The raw material of each layer adhesive layer 5 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-barrier multi-layer co-extrusion packaging film of the present embodiment, top layer 1 thickness: 9 microns, internal layer 4 thickness 20 microns, the first sandwich layer 2 thickness is 3 microns, and the second sandwich layer 3 thickness is 6 microns, and adhesive layer 5 thickness is 4 microns.
Each layer raw material, top layer 1: polyolefin layer is 100kg, specifically 60kg ethylene-alpha-olefin copolymer (alhpa olefin is propylene) altogether, and density is 0.88g/cm
3, and the mixed layer of the ethylene-methacrylic acid copolymer mixing of 40kg;
First sandwich layer 2: the mixed layer of ultra-low density polyethylene 35kg and linear density polyethylene 25kg, density 0.915g/cm after mixing
3, melt index is 0.55g/10min; Second sandwich layer 3:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm
3) and the epoxidized soybean oil of 2kg; Internal layer 4: the mixed layer 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 5 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-barrier multi-layer co-extrusion packaging film of the present embodiment, top layer 1 thickness: 10 microns, internal layer 4 thickness 24 microns, the thickness of the first sandwich layer 2 is 3 microns, and the thickness of the second sandwich layer 3 is 6 microns, and adhesive layer 5 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 mixed layer of the ethylene-vinyl acetate copolymer mixing of 30kg;
First sandwich layer 2: linear low density polyethylene layer 50kg, density 0.90g/cm
3, melt index is 0.35g/10min; Second sandwich layer 3:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm
3) and the epoxidized soybean oil of 2kg; Internal layer 4: linear density polyethylene layer 50kg, density 0.92g/cm
3, melt index is 0.70g/10min; The raw material of each layer adhesive layer 5 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-barrier multi-layer co-extrusion packaging film of the present embodiment, top layer 1 thickness: 9 microns, internal layer 4 thickness 22 microns, the first sandwich layer 2 and the second sandwich layer 3 thickness are 5 microns, and adhesive layer 5 thickness is 4 microns.
Each layer raw material, top layer 1: the mixed layer that polyamide 6 0kg and polyester 40kg (PET) mixes;
First sandwich layer 2: the mixed layer of ultra-low density polyethylene 55kg and linear density polyethylene 35kg, density 0.91g/cm after mixing
3, melt index is 0.60g/10min; Second sandwich layer 3:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm
3) and the epoxidized soybean oil of 2kg; Internal layer 4: linear low density polyethylene layer 50kg, density 0.90g/cm
3, melt index is 0.35g/10min; The raw material of each layer adhesive layer 5 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-barrier multi-layer co-extrusion packaging film of the present embodiment, top layer 1 thickness: 10 microns, internal layer 4 thickness 24 microns, the thickness of the first sandwich layer 2 is 4 microns, and the thickness of the second sandwich layer 3 is 7 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 mixed layer of the ethylene-butyl acrylate copolymer mixing of 25kg;
First sandwich layer 2: linear low density polyethylene layer 50kg, density 0.90g/cm
3, melt index is 0.35g/10min; Second sandwich layer 3:98kg vinylidene chloride-maleic anhydride compound (fusing point 150 DEG C, density 1.7g/cm
3) and the epoxidized soybean oil of 2kg; Internal layer 4: linear density polyethylene layer 50kg, density 0.92g/cm
3, melt index is 0.70g/10min; The raw material of each layer adhesive layer 5 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-barrier multi-layer co-extrusion packaging film of the present utility model, 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 utility model, protection domain of the present utility model is not constituted any limitation.The technical scheme that all employing equivalents or equivalence are replaced and formed, all drops within the utility model claims.
Claims (7)
1. a high-barrier multi-layer co-extrusion packaging film, comprise top layer (1), internal layer (4) and the sandwich layer between them, it is characterized in that described sandwich layer comprises the first sandwich layer (2) and the second sandwich layer (3) mutually bonded by adhesive layer (5), wherein between the first sandwich layer (2) and top layer (1), and also all bond by adhesive layer (5) between the second sandwich layer (3) and internal layer (4); And the Thickness Ratio of the first sandwich layer (2) and the second sandwich layer (3) is 1:1 ~ 3:4; Wherein: described the first sandwich layer (2) is polyethylene layer, described second sandwich layer (3) is polyvinylidene chloride layer.
2. high-barrier multi-layer co-extrusion packaging film according to claim 1, is characterized in that described top layer (1) is aramid layer, one in polyolefin layer and polyester layer.
3. high-barrier multi-layer co-extrusion packaging film according to claim 1, it is characterized in that described internal layer (4) is polyethylene layer, this polyethylene layer is the one in linear low density polyethylene layer, ultra-low density polyethylene layer, linear density polyethylene layer, density 0.90 ~ 0.92g/cm
3.
4. high-barrier multi-layer co-extrusion packaging film according to claim 1, is characterized in that the gross thickness of described first sandwich layer (2) and the second sandwich layer (3) is 6 ~ 11 microns.
5. the high-barrier multi-layer co-extrusion packaging film according to claim 1 or 4, it is characterized in that the thickness on described top layer (1) is 8 ~ 10 microns, the thickness range of internal layer (4) is 19 ~ 24 microns, and the thickness of described every layer of adhesive layer (5) is 3 ~ 5 microns.
6. the high-barrier multi-layer co-extrusion packaging film according to claim 1 or 3, is characterized in that the melt index of the polyethylene layer of described first sandwich layer (2) and the polyethylene layer of internal layer (4) is 0.35 ~ 0.78g/10min.
7. high-barrier multi-layer co-extrusion packaging film according to claim 1, it is characterized in that described the first sandwich layer (2) is linear low density polyethylene layer, one in ultra-low density polyethylene layer, linear density polyethylene layer, density 0.90 ~ 0.92g/cm
3; Described second sandwich layer (3) is vinylidene chloride-maleic anhydride compound layer, fusing point 150 DEG C, density 1.7g/cm
3.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111483201A (en) * | 2020-04-21 | 2020-08-04 | 珠海徐太日用品有限公司 | High-barrier flexible packaging film and preparation process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111483201A (en) * | 2020-04-21 | 2020-08-04 | 珠海徐太日用品有限公司 | High-barrier flexible packaging film and preparation process thereof |
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