CN101693420A - Coextruded film with improved performance and preparation method thereof - Google Patents
Coextruded film with improved performance and preparation method thereof Download PDFInfo
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- CN101693420A CN101693420A CN200910179981A CN200910179981A CN101693420A CN 101693420 A CN101693420 A CN 101693420A CN 200910179981 A CN200910179981 A CN 200910179981A CN 200910179981 A CN200910179981 A CN 200910179981A CN 101693420 A CN101693420 A CN 101693420A
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Abstract
The invention discloses a coextruded film with improved performance, comprising a coextruded film structural layer compounded on a multilayer coextruded film. The compound structural layer is called as a coextruded film improved layer or a coextruded film protective layer; the coextruded film improved layer or the coextruded film protective layer is used for improving the performance of the coextruded film or protecting the surface of the coextruded film. In the invention, one layer or multilayer of modified materials are increased on the surface of the multilayer coextruded film by coating technique, and the compounded materials have certain special functions so that many special requirements can be satisfied, in particular various functional requirements for heat sealing layer materials.
Description
Technical field
The present invention relates to the processing method of plastic sheeting, be specifically related to coextruded film of a kind of improvement in performance and preparation method thereof.
Background technology
At present, multi-layer co-extruded plastics film has obtained application more and more widely, especially no matter barrier film is multi-layer co-extruded blown film or multi-layer co-extruded cast film, has all played more and more important effect in packaging for foodstuff, industrial goods packing and other particular packing field.Multi-layer co-extruded film is with polyethylene (PE), polypropylene (PP), polyamide (PA), ethylene-vinyl alcohol copolymer (EVOH), ethylene-vinyl acetate copolymer various polymeric materials such as (EVA) and other modified resin and filler, by the melting plasticizing respectively of a plurality of screw rods, utilize the stream deformation energy and the pressure coupling of various resins, be combined into thin film by a multilayer die head then.Multi-layer co-extruded multi-layer co-extruded blown film and the multi-layer co-extruded curtain coating of being divided into again, usually, the said multi-layer co-extruded film of people is meant the film with structure more than three layers or three layers.
Multi-layer co-extruded film biggest advantage is to contain one or more layers of barrier material, and common barrier material is polyamide (PA) and ethylene-vinyl alcohol copolymer (EVOH), and all gases and steam are had good barrier property.Multi-layer co-extruded film has special advantages aspect the manufacturing barrier film, and the thickness of barrier material and interlayer distribute and all can adjust according to demand.
But the barrier packaging film in actual applications, and many special requirements are often arranged again, especially the hot sealing layer material had various functional requirements.Such as requiring the co-extrusion film to seal with multiple base materials such as polyethylene, polypropylene or polystyrene, so need with can be simultaneously and the resin material such as the ethylene-vinyl acetate polymer of these materials heat-sealings, but hot sealing layer material the most frequently used in multi-layer co-extruded remains polyethylene or polypropylene, other material is clamminess by multi-layer co-extruded easy generation, wrinkling, be difficult for phenomenons such as uncoiling, and from the angle of cost, these special heat-sealable material prices are difficult to processing and thickness are accomplished extremely thin all than higher in co-extrusion processing.Again for example, in some special dimension, promptly needed the envelope temperature very low, required to have the film that easily tears effect again, though directly also can realize these functions by multi-layer co-extruded technology, difficulty of processing is quite high, and cost rises apparent in view.
In the application of multi-layer co-extruded film, much have the packing of specific (special) requirements in addition, adopt traditional multi-layer co-extruded film to meet the demands.Also there is structure conversion cost height in multi-layer co-extruded technology simultaneously, change the bigger deficiency of structure loss, and some material is bigger with multi-layer co-extruded processing technology difficulty of processing.Especially in the time of need using some special materials on the surface, directly adopt multi-layer co-extruded can't finishing.For example.Material with high corrosion resistance need be used the Ionomer (SURLYN) of acid modification, and this Ionomer can't disposablely machine in co-extrusion.Say technically, though also can be compound, wet type is compound or solvent-free compound these functions that realizes by dry type, can there be residual solvent in complex technique again, the film integral embrittlement, loss is than problems such as height.Therefore, be necessary traditional multi-layer co-extruded membrane structure and production technology are improved
Summary of the invention
The objective of the invention is to overcome defective of the prior art, design coextruded film of a kind of improvement in performance and preparation method thereof.This method can be according to the difference in functionality sexual demand of user to coextruded film, at surface recombination one deck of film, two-layer or two-layer above resin material, by layer with layer between coupling realize the multiple merit specific function of film.
For achieving the above object; technical scheme of the present invention is the coextruded film that proposes a kind of improvement in performance; described coextruded film is included in the compound coextruded film structure sheaf of multi-layer co-extruded film; compound structure sheaf be called the coextruded film improving layer or be called the coextruded film protective layer, described coextruded film improving layer or coextruded film are protective layer used in the performance of improving coextruded film or be used to protect the surface of coextruded film.
Wherein, described coextruded film improving layer or coextruded film protective layer are to be added on the arbitrary surface or two surfaces of described multi-layer co-extruded film by mode applied or that drench film.
Wherein, described coating method is to adopt extrusion equipment that coextruded film improving layer or coextruded film protective layer are coated on the arbitrary surface or two surfaces of described coextruded film equably.
Wherein, described extrusion equipment can be directly at the surface of multi-layer co-extruded film coating coextruded film improving layer or coextruded film protective layer; or after multi-layer co-extruded film surface printing or being coated with other coating, again by extrusion equipment coating coextruded film improving layer or coextruded film protective layer.
Wherein, be coated on the arbitrary surface of described multi-layer co-extruded film or the coextruded film improving layer or the coextruded film protective layer on two surfaces and have one deck at least.
Wherein, the material of any one deck in described coextruded film improving layer or the coextruded film protective layer is low density polyethylene (LDPE) (LDPE); medium density polyethylene (MDPE); high density polyethylene (HDPE) (HDPE); LLDPE (LLDPE); metallocene PE (mPE); polypropylene (PP); acrylic acid ethylene (EAA); methacrylic acid-ethylene copolymer (EMAA); ethylacrylic acid-ethylene copolymer (EEAA); Ionomer (SURLYN); vinylacetate-ethylene copolymer (EVA); polybutene (PB); polyamide (PA); in the ethylene-vinyl alcohol copolymer (EVOH) one or more, or be that the filler of carrier mixes with the above-mentioned material.
Wherein, described multi-layer co-extruded film is the barrier film that adopts multi-layer co-extruded blown film or The tape casting to make, and contains barrier material in coextruded film.
Wherein, the structure of described multi-layer co-extruded film is at least 3 layers.
Advantage of the present invention and beneficial effect are: the method for improving the coextruded film performance is to increase at multi-layer co-extruded film surface by coating process that one or more layers is material modified, because these are had some special function by compound material.Can satisfy many special requirements, especially the hot sealing layer material be had various functional requirements.Such as require the co-extrusion film can with polyethylene, multiple base material such as polypropylene or polystyrene seals, so need with can be simultaneously and the resin material such as the ethylene-vinyl acetate polymer of these materials heat-sealings, but hot sealing layer material the most frequently used in multi-layer co-extruded remains polyethylene or polypropylene, other material is clamminess by multi-layer co-extruded easy generation, wrinkling, be difficult for phenomenons such as uncoiling, and from the angle of cost, these special heat-sealable material prices are all than higher, being difficult to processing in co-extrusion processing accomplishes thickness extremely thin, in this case, just can take extrusion coated method on the former polyolefin layer of multi-layer co-extruded film, to drench film one deck ethylene-vinyl acetate polymer (EVA), this layer thickness can accurately be controlled at below 5 microns, promptly realized the heat sealability of multiple material, solved a technology difficult problem again, cost control is also very accurate.Again for example, in some special dimension, promptly needed the envelope temperature very low, require to have the film that easily tears effect again, though directly also can realize these functions by multi-layer co-extruded technology, difficulty of processing is quite high, and cost rises apparent in view, adopt coating process at multi-layer co-extruded film surface coating one deck hot sealing layer, with regard to the more satisfactory target that reached.
In the application of multi-layer co-extruded film, much have the packing of specific (special) requirements in addition, adopt traditional multi-layer co-extruded film to meet the demands.Also there is structure conversion cost height in multi-layer co-extruded technology simultaneously, change the bigger deficiency of structure loss, and some material is bigger with multi-layer co-extruded processing technology difficulty of processing.Especially in the time of need using some special materials on the surface, directly adopt multi-layer co-extruded can't finishing.For example.Material with high corrosion resistance need be used the Ionomer (SURLYN) of acid modification, and this Ionomer can't disposablely machine in co-extrusion.Say technically, though also can be compound, wet type is compound or solvent-free compound these functions that realizes by dry type, can there be residual solvent in complex technique again, the film integral embrittlement, loss is than problems such as height.Increase one or more layers heat-sealable material or protective material by the surface that is coated on multi-layer co-extruded film, just can perfectly address these problems.
Owing to the present invention proposes a kind of by surface coating or drench the film manufacturing and have the method for multifunctional heating sealing property barrier film.This method is to increase one or more layers material by coating process at multi-layer co-extruded film surface, and these compound materials have some special function.According to different functional demands, can be at the compound one deck of film surface, two-layer or two-layer above resin material is realized multiple functional by the coupling between layer and the layer.Both can only be coated with by this method, also can all be coated with on two surfaces of film on a surface of film.For example, easily tear resin bed, can make and have the coextruded film that easily tears function, print back coating layer of polyethylene on another surface with protection printing ink in the coating of the one side of film.
Description of drawings
Fig. 1 is the multi-layer co-extruded membrane structure schematic diagram of the embodiment of the invention 1;
Fig. 2 is the multi-layer co-extruded membrane structure schematic diagram of the embodiment of the invention 2;
Fig. 3 is the multi-layer co-extruded membrane structure schematic diagram of the embodiment of the invention 3;
Fig. 4 is the multi-layer co-extruded membrane structure schematic diagram of the embodiment of the invention 4;
Fig. 5 is the multi-layer co-extruded membrane structure schematic diagram of the embodiment of the invention 5;
Fig. 6 is the multi-layer co-extruded membrane structure schematic diagram of the embodiment of the invention 6;
Fig. 7 is the multi-layer co-extruded membrane structure schematic diagram of the embodiment of the invention 7.
Among the figure:
| The English abbreviation | The Chinese full name |
| ??EVA | Ethylene-vinyl acetate copolymer |
| ??EVOH | Ethylene-vinyl alcohol copolymer |
| ??PE | Polyethylene |
| ??LDPE | LDPE |
| ??PA | Polyamide (nylon) |
| ??SURLYN | Ionomer |
| ??TIE | Binding resin |
| The English abbreviation | The Chinese full name |
| ??Ink | Lettering (printed layers) |
| ??B | Multi-layer co-extruded film |
| ??C | Coextruded film improving layer or coextruded film protective layer |
The specific embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is further described.Following examples only are used for technical scheme of the present invention more clearly is described, and can not limit protection scope of the present invention with this.
The concrete technical scheme of implementing of the present invention is:
Embodiment 1:
Structure: B is the five-layer co-squeezing film as shown in Figure 1, this coextruded film is by two layers of polyethylene (B-1 and B-5), one deck barrier layer polyamide or ethylene-vinyl alcohol copolymer (B-3) constitute with two-layer binding material (B-2 and B-4), increase one deck structure C by extrusion coated equipment on the surperficial B-5 of B, the material of C layer is ethylene-vinyl acetate copolymer (EVA).Contain the functional hot sealing layer C of one deck by the film behind extrusion coated increase one deck C, this layer hot sealing layer have can with the multiple different all heat sealable performances of base material such as polyethylene, polypropylene or polystyrene.The film of Zhi Zaoing had both had barrier by this method, had had good heat sealability again.
Embodiment 2:
Structure: B is the seven-layer co-extrusion film as shown in Figure 2, this coextruded film is by two layers of polyethylene (B-3 and B-7), two-layer barrier layer polyamide (B-1 and B-5) constitutes with three layers of binding material (B-2, B-4 and B-6), and this seven-layer co-extrusion film has good mouldability and mechanical strength.Increase one deck structure C by extrusion coated equipment on the surperficial B-7 of B, the material of C layer is ethylene-vinyl acetate copolymer (EVA).Contain the functional hot sealing layer C of one deck by the film behind extrusion coated increase one deck C, this layer hot sealing layer have can with the multiple different all heat sealable performances of base material such as polyethylene, polypropylene or polystyrene.The film of Zhi Zaoing has barrier concurrently by this method, mouldability and mechanical strength and heat sealability widely.
Embodiment 3:
Structure: B is the seven-layer co-extrusion film as shown in Figure 3, this coextruded film is by four layers of polyethylene (B-1, B-2 and B-6, B-7), one deck barrier layer polyamide or ethylene-vinyl alcohol copolymer (B-4) constitute with two-layer binding material (B-3 and B-5), and this seven-layer co-extrusion film has good barrier.Increase double-layer structure C-1 and C-2 by extrusion coated equipment on the surperficial B-7 of B, wherein C-1 is a polyethylene, and C-2 is an ionic polymers.The film that makes is hot sealing layer with C-2, and Ionomer (SURLYN) has excellent heat-sealing window and hot sticky intensity, is specially adapted to high-speed packaging, but also can carries out involution with glass, metal.By extrusion coated C-1, can reduce cost under the prerequisite of performance guaranteeing.Contain the functional hot sealing layer C of one deck by the film behind extrusion coated increase one deck C, this layer hot sealing layer have can with the multiple different all heat sealable performances of base material such as polyethylene, polypropylene or polystyrene.The film of Zhi Zaoing has barrier concurrently by this method, mouldability and mechanical strength and heat sealability widely.
Embodiment 4:
Structure: B is nine layers of coextruded film as shown in Figure 4, this coextruded film is by four layers of polyethylene (B-1, B-2, B-3 and B-9), one deck barrier layer ethylene-vinyl alcohol copolymer (B-6), two-layer enhancement Layer polyamide (B-5 and B-7) constitutes with two-layer binding material (B-4 and B-8), and these nine layers of coextruded films have good barrier and mechanical strength.When making printing packaging, need to print lnk (printed layers) on a surperficial B-1 therein, therefore after printing on the B-1 face, on printing ink, increase one deck C-3 by extrusion coated equipment, the C-3 layer is a polyethylene, on another surperficial B-9, increase double-layer structure C-1 and C-2, wherein C-1 is a low density polyethylene (LDPE), and C-2 is an ionic polymers.The film that this example makes is hot sealing layer with C-2, and Ionomer (SURLYN) has excellent heat-sealing window and hot sticky intensity, is specially adapted to high-speed packaging, but also can carries out involution with glass, metal.By extrusion coated C-1, can reduce cost under the prerequisite of performance guaranteeing.The C-3 layer that increases on the B-1 printing surface has simultaneously effectively been protected printed layers again; the most safe food security performance protective value is provided; this film is at high obstructing performance, mechanical strength, printing aesthetic property, involution widely, and everyways such as high-speed packaging adaptability have incomparable advantage.
Embodiment 5:
Structure: B is eight layers of coextruded film as shown in Figure 5, this coextruded film is by two layers of polyethylene (B-7 and B-8), three layers of enhancement Layer polyamide (B-1, B-3 and B-5) constitute with two-layer binding material (B-2 and B-6), and these eight layers of coextruded films have good barrier and mechanical strength.But, have influence on the application of film when serious aspect crystallinity because the very big-difference that polyamide and polyethylene exist causes the film of this structure very easily curling.Increase one deck C by extrusion coated equipment at the PE surface of these eight layers of coextruded films B-8, the material selection ethylene-vinyl acetate copolymer of C layer, because vinylacetate is non-crystalline polymer, after increasing the low-down layer of one deck degree of crystallinity, can make the top layer C of new film more close on degree of crystallinity with another top layer B-1, with this crimpness of just having improved film greatly, make the flatness of film improve.
Embodiment 6:
Structure: B is the seven-layer co-extrusion film as shown in Figure 6, this coextruded film is by two layers of polyethylene (B-1 and B-7), two-layer enhancement Layer polyamide (B-3 and B-5) and three layers of binding material (B-2, B-4 and B-6) constitute, this seven-layer co-extrusion film has very excellent toughness and mechanical strength, and the transparency of film is also very good.Increase two-layer by extrusion coated equipment at two the surperficial B-1 and the B-7 lattice of this seven-layer co-extrusion film, increase C-1 and C-2 on the B-1 surface, increase C-3 and C-4 on the B-7 surface, new film is the eleventh floor film, two surfaces of new film are ethylene-vinyl acetate copolymer, this film can be under extremely low temperature and other substrate surface involution, and the flatness of this film, transparency and mechanical property all have clear superiority.
Embodiment 7:
Structure: B is the seven-layer co-extrusion film as shown in Figure 7, this coextruded film is by four layers of polyethylene (B-1, B-2 and B-6, B-7), one deck barrier layer polyamide or ethylene-vinyl alcohol copolymer (B-4) constitute with two-layer binding material (B-3 and B-5), and this seven-layer co-extrusion film has good barrier.On the surperficial B-7 of B, increase three-decker C-1 by extrusion coated equipment, C-2 and C-3, wherein C-1 is a bonding layer material, and C-2 is ethylene-vinyl alcohol copolymer (EVOH), and C-3 is a polyamide (PA).The film that makes increases one deck barrier layer C-2 and sealer C-3 by drenching film.This coextruded film has barrier concurrently, good mechanical stability and flatness.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. the coextruded film of an improvement in performance; it is characterized in that; described coextruded film is included in the compound coextruded film structure sheaf of multi-layer co-extruded film; compound structure sheaf be called the coextruded film improving layer or be called the coextruded film protective layer, described coextruded film improving layer or coextruded film are protective layer used in the performance of improving coextruded film or be used to protect the surface of coextruded film.
2. coextruded film as claimed in claim 1 is characterized in that, described coextruded film improving layer or coextruded film protective layer are to be compounded on the arbitrary surface or two surfaces of described multi-layer co-extruded film by the coating or the mode of drenching film.
3. coextruded film as claimed in claim 2 is characterized in that, is coated on the arbitrary surface of described multi-layer co-extruded film or the coextruded film improving layer or the coextruded film protective layer on two surfaces and is provided with one deck at least.
4. coextruded film as claimed in claim 3; it is characterized in that; the material of any one deck in described coextruded film improving layer or the coextruded film protective layer is a low density polyethylene (LDPE); medium density polyethylene; high density polyethylene (HDPE); LLDPE; metallocene PE; polypropylene; acrylic acid ethylene; methacrylic acid-ethylene copolymer; ethylacrylic acid-ethylene copolymer; Ionomer; vinylacetate-ethylene copolymer; polybutene; polyamide; in the ethylene-vinyl alcohol copolymer one or more, or be that the filler of carrier mixes with the above-mentioned material.
5. coextruded film as claimed in claim 4 is characterized in that, comprises the barrier film that is made of multi-layer co-extruded blown film or multi-layer co-extruded casting films in described multi-layer co-extruded film, also contains barrier material in described coextruded film.
6. as each described coextruded film of claim 1 to 5, it is characterized in that the structure of described multi-layer co-extruded film haves three layers at least.
7. the preparation method of each described coextruded film of claim 1-6; it is characterized in that; described method is included in multi-layer co-extruded film surface increases coextruded film by the mode of coating or pouring film structure sheaf; the structure sheaf that is increased is called the coextruded film improving layer or is called the coextruded film protective layer, and described coextruded film improving layer or coextruded film are protective layer used in the performance of improving coextruded film or be used to protect the surface of coextruded film.
8. method as claimed in claim 7 is characterized in that, described coating method is to adopt extrusion equipment that coextruded film improving layer or coextruded film protective layer are coated on the arbitrary surface or two surfaces of described coextruded film equably.
9. method as claimed in claim 8; it is characterized in that; described extrusion equipment is directly at the surface of multi-layer co-extruded film coating coextruded film improving layer or coextruded film protective layer; or after multi-layer co-extruded film surface printing or being coated with other coating, again by extrusion equipment coating coextruded film improving layer or coextruded film protective layer.
10. method as claimed in claim 8 or 9 is characterized in that, is coated on the arbitrary surface of described multi-layer co-extruded film or the coextruded film improving layer or the coextruded film protective layer on two surfaces and has one deck at least.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910179981A CN101693420A (en) | 2009-10-16 | 2009-10-16 | Coextruded film with improved performance and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910179981A CN101693420A (en) | 2009-10-16 | 2009-10-16 | Coextruded film with improved performance and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101870389A (en) * | 2010-06-28 | 2010-10-27 | 江阴升辉包装材料有限公司 | Air-permeable and moldable coextruded film |
| CN102225645A (en) * | 2011-04-21 | 2011-10-26 | 江阴申恒特种新材料有限公司 | Multilayer co-extruded water sack film |
| CN102229270A (en) * | 2011-04-15 | 2011-11-02 | 江阴升辉包装材料有限公司 | Composite structure high barrier molded resin sheet material, and processing method thereof |
| CN102963040A (en) * | 2012-11-29 | 2013-03-13 | 大连创达技术交易市场有限公司 | Novel waterproof package film |
| CN103264840A (en) * | 2013-06-07 | 2013-08-28 | 浙江金石包装有限公司 | Aluminum foil openable cover and preparation method thereof |
| CN109228584A (en) * | 2018-03-16 | 2019-01-18 | 上海万封新材料技术有限公司 | Joint strip and its production technology in EVOH high-barrier |
| CN110027787A (en) * | 2019-03-28 | 2019-07-19 | 浙江银科新材料科技有限公司 | A kind of multi-layer co-extruded shaping membrane and its manufactured vacuum packaging bag |
-
2009
- 2009-10-16 CN CN200910179981A patent/CN101693420A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101870389A (en) * | 2010-06-28 | 2010-10-27 | 江阴升辉包装材料有限公司 | Air-permeable and moldable coextruded film |
| CN102229270A (en) * | 2011-04-15 | 2011-11-02 | 江阴升辉包装材料有限公司 | Composite structure high barrier molded resin sheet material, and processing method thereof |
| CN102225645A (en) * | 2011-04-21 | 2011-10-26 | 江阴申恒特种新材料有限公司 | Multilayer co-extruded water sack film |
| CN102963040A (en) * | 2012-11-29 | 2013-03-13 | 大连创达技术交易市场有限公司 | Novel waterproof package film |
| CN103264840A (en) * | 2013-06-07 | 2013-08-28 | 浙江金石包装有限公司 | Aluminum foil openable cover and preparation method thereof |
| CN103264840B (en) * | 2013-06-07 | 2015-09-23 | 浙江金石包装有限公司 | A kind of aluminum foil openable cover and preparation method thereof |
| CN109228584A (en) * | 2018-03-16 | 2019-01-18 | 上海万封新材料技术有限公司 | Joint strip and its production technology in EVOH high-barrier |
| CN110027787A (en) * | 2019-03-28 | 2019-07-19 | 浙江银科新材料科技有限公司 | A kind of multi-layer co-extruded shaping membrane and its manufactured vacuum packaging bag |
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Application publication date: 20100414 |