CN1966244A - PVDC composite film for seven-layer coextrusion processing and its method - Google Patents
PVDC composite film for seven-layer coextrusion processing and its method Download PDFInfo
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- CN1966244A CN1966244A CN 200510115400 CN200510115400A CN1966244A CN 1966244 A CN1966244 A CN 1966244A CN 200510115400 CN200510115400 CN 200510115400 CN 200510115400 A CN200510115400 A CN 200510115400A CN 1966244 A CN1966244 A CN 1966244A
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Abstract
The invention relates to a polyvinylidene chloride (PVDC) composite film whose seven layers are extruded together, wherein the invention is characterized in that: when extruding polyvinylidene chloride, at the middle layer (or outer layer), it extrudes out the composite film, to utilize the characters of polyvinylidene chloride as high density, transparent and better print property. Said film comprises protective layer, above composite shade layer, strengthen layer, adhesive layer, baffle layer, adhesive layer and print layer; the baffle layer and the adhesive layer can be exchanged; the print layer is made from polyethylene at 1-5 mum thick; the adhesive layer is made from thermoplastic adhesive at 0.2-3 mum thick. The invention has wide application.
Description
One, technical field:
The present invention relates to a kind of PVDC composite film and method thereof of seven-layer co-extrusion processing, belong to of the application of polymer advanced composite material (ACM) at packaging field.
Two, background technology
Polyvinylidene chloride (PVDC) is compared with other plastics, and it is its maximum characteristics that a lot of gases and liquid are had very low transmitance, therefore is widely used as packaging material.This specific character is to be made of the high density of its molecule and high crystalline, improves any one in these two factors, all can make littler that transmitance falls.The same main influence that is subjected to the kind and the quantity of comonomer of the permeability of PVDC with its degree of crystallinity, and little with the relation of orientation.
Because the fusing point acumen of PVDC resin, so must not adopt general screw rod design and extrusion.When thinking that by test pitch is 0.8-1 with the screw diameter ratio, can obtain the highest extrusion capacity and plasticizing efficiency.The garden shape loading hopper that equates with screw diameter should be set.During the spiral groove depth 3/8-1/2 at hopper place, compression ratio adopts 3.5-5.0, does not allow to stop for a long time in machine barrel, so need to adopt the screw rod that manys than extruding other thermoplastics weak points, its screw slenderness ratio is 9-10, and a mouth mould inner flow passage need be streamlined.Extruder has the characteristics of Fast Heating and cooling, decomposes to prevent PVDC.
The earlier quick Cooling Quenching of the tubular film of extruding makes degree of crystallinity reduce to minimum.The temperature of cryostat with copolymer form, prescription, the size of rate of extrusion and pipe and becoming.
Three, summary of the invention
1, goal of the invention: high-barrier gas, the liquid properties of utilizing polyvinylidene chloride; and its thermoplastic processing characteristic; extrude jointly with other thermoplastic, produce polyvinylidene chloride composite packing film and method that a kind of seven-layer co-extrusion that has high barrier, high strength, high photophobism and make things convenient for environmental protection to reclaim is processed.This film is mainly used in special fresh-keeping packaging fields such as long fresh-keeping period and Aero-Space, radio electronics.
2, summary of the invention:
The structure of this film is for being coated with compound lucifuge layer, enhancement layer, tack coat, barrier layer, adhesive linkage and printed layers successively on protective layer; The locations of structures of barrier layer and adhesive linkage can be exchanged; The material of printed layers is a polyethylene, and its thickness is 1-5 μ m; The material of adhesive linkage is the thermoplastic adhesive, and its thickness is 0.2-3 μ m; The material of barrier layer is a polyvinylidene chloride, and its thickness is 0.2-2 μ m; The material of adhesive linkage is the thermoplastic adhesive, and its thickness is 0.2-3 μ m; The material of enhancement layer is a blended and modified polyethylene, and its thickness is: 0.1-2 μ m; The material of lucifuge layer is a black polyethylene, and its thickness is 1-5 μ m; The material of protective layer is a polyethylene, and its thickness is 1-3 μ m; The gross thickness of the polyvinylidene chloride composite packing film of seven-layer co-extrusion processing is 3-20 μ m.
The process of the polyvinylidene chloride composite packing film of a kind of co-extrusion processing of the present invention is characterized in that, concrete technology:
(1) makes plasticizer with adding good heat stabilizer and epoxy sunflower oil in the polyvinylidene chloride, add 2-4 part 2-oxygen-5-chlorobenzophenone and make light stabilizer, mix, for extruding usefulness;
(2) with all the other material polyethylene of six layers, thermoplastic adhesive, polyvinylidene chloride, thermoplastic adhesive and six kinds of materials of polyethylene, during six extruders were surplused in input institute respectively, synchronous extrusion plasticizing was at mouth mould place composite membrane-forming;
Temperature is 120 ℃-160 ℃ when (3) plastifying polyvinylidene chloride, finds time 40-80 second, does not allow to stop for a long time in machine barrel, in order to avoid thermal degradation;
In (4) seven layers of die head, extrude the polyvinylidene chloride die gap and should suitably relax about 40%-60%;
(5) make tubular parison after, through fast inflation, cooling, through being distracted into tubular article.Cut, batch, use according to packing instructions for printing.
Select good heat stabilizer and plasticizer, and note thermal degradation.Mold runner makes streamlined as far as possible, excessively decomposes to keep from heat.Transform extruder, make it have the advantages that Fast Heating, cooling and minimizing resin decompose.Extruder and mould are selected the new material of acidproof gas corrosion for use.Plasticizer commonly used has: oxolane, diphenyl-ethyl ether, dichlorobenzene, ethyl acetate, cyclohexanone, methyl ethyl ketone, epoxidized soybean oil, epoxy sunflower oil.Stabilizing agent is used: 2-oxygen-5-chlorobenzophenone.
3, invention effect
Utilize the seven-layer co-extrusion composite packing film of polyvinylidene chloride production and the seven-layer co-extrusion film of traditional mode of production to compare, barrier to oxygen, carbon dioxide improves nearly a hundred times, intensity improves 20%, fresh-keeping same based food, prolong storage period more than one times, be specially adapted to the packing of long-term fresh-keeping foodstuff such as meat, sausage, fish, drinks, essence.
Four, accompanying drawing and drawing explanation
Fig. 1 is a structural representation of the present invention
---printed layers (2), (4)---adhesive linkage (3)---barrier layer (5)---enhancement layer (6)---lucifuge layer (7)---protective layer wherein: (1)
Advantage of the present invention is:
1, can use traditional coextrusion film blowing equipment.
2, simple to operate, product barrier property, water resistance obviously improve.
3, polymerisable monomer and additive dissolve in the polyvinylidene chloride, and are uniformly dispersed, and become Need not remove behind the film.
4, production technology is simple, does not need granulation, is directly used in extrusion molding.
Five, embodiment
Below in conjunction with accompanying drawing enforcement of the present invention is described in detail: structure of the present invention is for being coated with lucifuge layer (6), enhancement layer (5), adhesive linkage (4), barrier layer (3), adhesive linkage (2) and printed layers (1) successively on protective layer (7).Wherein the locations of structures of barrier layer (3) and adhesive linkage (4) is interchangeable, and enhancement layer in the time of exchange (5) becomes adhesive linkage (2), and adhesive linkage (2) becomes barrier layer (3).Exchange howsoever, the barrier layer two sides must go up earlier adhesive linkage can with other layer co-extrusion, and printed layers (1) and protective layer (7), lucifuge layer (6) are not interchangeable.
Overall film thickness of the present invention is 10 μ m, and wherein the thickness of printed layers (1) is 1 μ m, and material is a polyethylene; The thickness of adhesive linkage (2), (4) respectively is 1 μ m, and material is the thermoplastic adhesive; The thickness of barrier layer (3) is 2 μ m, and material is a polyvinylidene chloride; The thickness of enhancement layer (5) is 2 μ m, and material is a blended and modified polyethylene.Blended and modified polyethylene is meant high density polyethylene (HDPE), medium density polyethylene, low density polyethylene (LDPE), linear low density polyethylene (LLDPE) and metallocene PE.Different according to the trade mark of buying with kind, carry out blending and modifying in conjunction with product needed, minimum two or more blend, what present embodiment adopted is low density polyethylene (LDPE) and LLDPE blend, ratio is 7: 3; The thickness of lucifuge layer (6) is 1.5 μ m, and material is a black polyethylene; The thickness of protective layer (7) is 1.5 μ m, and material is a polyethylene.
The process of the polyvinylidene chloride composite packing film of seven-layer co-extrusion processing of the present invention is: (described raw-material umber is parts by weight except that specifying)
(1) 100 parts of polyvinylidene chloride is added 6-7 part epoxy sunflower oil usually and make plasticizer, add 2.5 parts of 2-oxygen-5-chlorobenzophenones and make light stabilizer, mix, for extruding usefulness;
(2) with all the other polyethylene, thermoplastic adhesive, polyvinylidene chloride, thermoplastic adhesive and six kinds of materials of polyethylene, during six extruders were surplused in input institute respectively, synchronous extrusion plasticizing was at mouth mould place composite membrane-forming;
Temperature is 140 ± 5 ℃ when (3) plastifying polyvinylidene chloride, finds time 60 ± 20 seconds, does not allow to stop for a long time in machine barrel, in order to avoid thermal degradation;
In (4) seven layers of die head, extrude the polyvinylidene chloride die gap and should suitably relax about 50%;
(5) make tubular parison after, through fast inflation, cooling, through being distracted into tubular article.Cut, batch, use according to packing instructions for printing.
Claims (5)
1, a kind of polyvinylidene chloride composite packing film and method thereof of seven-layer co-extrusion processing; it is characterized in that: the structure of this film is the layer of coextru-lamination lucifuge successively (6), enhancement layer (5), adhesive linkage (4), barrier layer (3), adhesive linkage (2) and printed layers (1) on protective layer (7), and wherein the locations of structures of barrier layer (3) and adhesive linkage (4) can be exchanged.
2, the polyvinylidene chloride composite packing film and the method for seven-layer co-extrusion processing according to claim 1, it is characterized in that: the gross thickness of this film is 3-20 μ m, wherein:
(1) thickness of printed layers (1) is 1-5 μ m, and material is a polyethylene;
(2) thickness of adhesive linkage (2), (4) respectively is 0.2-3 μ m, and material is the thermoplastic adhesive;
(3) thickness of barrier layer (3) is 0.2-2 μ m, and material is a polyvinylidene chloride;
(4) thickness of enhancement layer (5) is 0.1-2 μ m, and material is a blended and modified polyethylene;
(5) thickness of lucifuge layer (6) is 1-5 μ m, and material is a black polyethylene;
(6) thickness of protective layer (7) is 1-3 μ m, and material is a PEF.
3. the process of the polyvinylidene chloride composite packing film of a seven-layer co-extrusion processing is characterized in that, concrete technology is:
(1) makes plasticizer with adding good heat stabilizer and epoxy sunflower oil in the polyvinylidene chloride, add 2-4 part 2-oxygen-5-chlorobenzophenone and make light stabilizer, mix, for extruding usefulness;
(2) with all the other material polyethylene of six layers, thermoplastic adhesive, polyvinylidene chloride, thermoplastic adhesive and six kinds of materials of polyethylene, during six extruders were surplused in input institute respectively, synchronous extrusion plasticizing was at mouth mould place composite membrane-forming;
Temperature is 120 ℃-160 ℃ when (3) plastifying polyvinylidene chloride, finds time 40-80 second, does not allow to stop for a long time in machine barrel, in order to avoid thermal degradation;
In (4) seven layers of die head, extrude the polyvinylidene chloride die gap and should suitably relax about 40%-60%;
(5) make tubular parison after, through fast inflation, cooling, through being distracted into tubular article.Cut, batch, use according to packing instructions for printing.
4. the polyvinylidene chloride composite packing film of seven-layer co-extrusion processing according to claim 3, it is characterized in that plasticizer commonly used has: oxolane, diphenyl-ethyl ether, dichlorobenzene, ethyl acetate, cyclohexanone, methyl ethyl ketone, epoxidized soybean oil, epoxy sunflower oil.
5. the polyvinylidene chloride composite packing film and the method for seven-layer co-extrusion processing according to claim 3, it is characterized in that, the material of enhancement layer (5) is that blended and modified polyethylene is meant high density polyethylene (HDPE), medium density polyethylene, low density polyethylene (LDPE), linear low density polyethylene (LLDPE) and metallocene PE, product needed is carried out blending and modifying, minimum two kinds or two various above material blend.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510115400 CN1966244A (en) | 2005-11-17 | 2005-11-17 | PVDC composite film for seven-layer coextrusion processing and its method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510115400 CN1966244A (en) | 2005-11-17 | 2005-11-17 | PVDC composite film for seven-layer coextrusion processing and its method |
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| CN1966244A true CN1966244A (en) | 2007-05-23 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873930A (en) * | 2007-11-27 | 2010-10-27 | 陶氏环球技术公司 | Be used to make the sandwich construction and the packing thereof of packing |
| CN102767650A (en) * | 2012-07-31 | 2012-11-07 | 上海日高科技集团有限公司 | Pipeline and producing process thereof |
| CN105792949A (en) * | 2013-10-18 | 2016-07-20 | 英诺薄膜有限公司 | Polyvinylidene chloride coated substrates |
| CN111546727A (en) * | 2020-05-27 | 2020-08-18 | 中国人民解放军海军特色医学中心 | Meat antibacterial and antiseptic preservative film, preservative bag and preparation method thereof |
| CN112060728A (en) * | 2020-08-27 | 2020-12-11 | 上海春宜药品包装材料有限公司 | High-barrier film for medicine packaging and preparation method thereof |
| CN112831121A (en) * | 2021-02-03 | 2021-05-25 | 洛阳晟鹏新材料科技有限公司 | PVDC high-barrier co-extrusion self-adhesive film for military protection and preparation method thereof |
| CN112874084A (en) * | 2021-02-03 | 2021-06-01 | 洛阳晟鹏新材料科技有限公司 | PVDC high-barrier co-extrusion stretching film for packaging low-temperature meat products and preparation method thereof |
-
2005
- 2005-11-17 CN CN 200510115400 patent/CN1966244A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873930A (en) * | 2007-11-27 | 2010-10-27 | 陶氏环球技术公司 | Be used to make the sandwich construction and the packing thereof of packing |
| CN102767650A (en) * | 2012-07-31 | 2012-11-07 | 上海日高科技集团有限公司 | Pipeline and producing process thereof |
| CN102767650B (en) * | 2012-07-31 | 2014-07-09 | 上海日高科技集团有限公司 | Pipeline and producing process thereof |
| CN105792949A (en) * | 2013-10-18 | 2016-07-20 | 英诺薄膜有限公司 | Polyvinylidene chloride coated substrates |
| CN111546727A (en) * | 2020-05-27 | 2020-08-18 | 中国人民解放军海军特色医学中心 | Meat antibacterial and antiseptic preservative film, preservative bag and preparation method thereof |
| CN112060728A (en) * | 2020-08-27 | 2020-12-11 | 上海春宜药品包装材料有限公司 | High-barrier film for medicine packaging and preparation method thereof |
| CN112831121A (en) * | 2021-02-03 | 2021-05-25 | 洛阳晟鹏新材料科技有限公司 | PVDC high-barrier co-extrusion self-adhesive film for military protection and preparation method thereof |
| CN112874084A (en) * | 2021-02-03 | 2021-06-01 | 洛阳晟鹏新材料科技有限公司 | PVDC high-barrier co-extrusion stretching film for packaging low-temperature meat products and preparation method thereof |
| CN112874084B (en) * | 2021-02-03 | 2023-08-22 | 洛阳晟鹏新材料科技有限公司 | PVDC high-barrier co-extrusion stretching film for packaging low-temperature meat products and preparation method thereof |
| CN112831121B (en) * | 2021-02-03 | 2023-09-15 | 洛阳晟鹏新材料科技有限公司 | PVDC high-barrier co-extrusion self-adhesive film for military protection and preparation method thereof |
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