CN101870389A - Air-permeable and moldable coextruded film - Google Patents
Air-permeable and moldable coextruded film Download PDFInfo
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- CN101870389A CN101870389A CN 201010210146 CN201010210146A CN101870389A CN 101870389 A CN101870389 A CN 101870389A CN 201010210146 CN201010210146 CN 201010210146 CN 201010210146 A CN201010210146 A CN 201010210146A CN 101870389 A CN101870389 A CN 101870389A
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Abstract
The invention discloses an air permeability-adjustable and thermally-moldable coextruded film. The coextruded film at least comprises an A layer plastic film, a B layer thermally-sealable plastic film and an air-permeable C layer bonded plastic film, wherein the C layer bonded plastic film is positioned between the A plastic film and B layer thermally-sealable plastic film; other plastic layers can also be inserted between the A layer plastic film and the B layer thermally-sealable plastic film; and a formed film is extruded from the plastic films through a coextruding device. The coextruded film has high and adjustable air permeability and can be subjected to thermal stretch forming so as to be prepared into arbitrarily-shaped packaging containers.
Description
Technical field
The present invention relates to a kind of coextruded film, be specifically related to a kind of co-extrusion packing film with Heat forming performance and breathing performance.
Background technology
At present, the lightweight of plastic package material, functionalization, environmental protectionization are the main flow trend of market development.Under the market trend influence, the application that integrates new material, new process, the new novel multi-layer coextruded film environment-friendly package material that designs is day by day extensive.Along with the development of economy to the globalization direction, have diversification, the packing of low-cost, multi-functional, safety and personalized function more and more are subjected to the favor in market.
At present, the principal market of PP TYPE packing is used and is divided into:
1, the multi-layer co-extruded film of non-obstruct can provide customized personalized packing for the client in a lot of fields.Simultaneously, utilize the peculiar functional characteristic of compound heat sealing substrate in the above-mentioned coextruded film, can reach and improve packing production efficiency, reduce the purpose of packing cost.But the multi-layer co-extruded film of existing non-obstruct is not because it possesses permeability to air basically, and its film easy-formation not.Therefore, the multi-layer co-extruded film of this non-obstruct can not be used to pack the fresh-keeping good permeability of ask for something, also will have the class article such as food, medicine, fresh flower of certain shape.
2, the multi-layer co-extruded film of high-barrier.This also is a kind of multi-layer co-extruded film, and the high-barrier coextrusion composite film can be set every layer of packing material according to different demands, but and every performance of binding resin, selected every layer material and prescription.According to intercepting the difference that requires, usually available nylon (PA), polyvinylidene chloride (PVDC) or the ethene-vinyl acetate alcohol copolymer (EVOH) adopted is as barrier material, and the sharpest edges of high-barrier coextruded film are to provide the barrier properties for gases and the aqueous vapor barrier of excellence.The barrier property of the multi-layer co-extruded film of high-barrier is regulated flexibly.But the multi-layer co-extruded film of this high-barrier is not because it possesses permeability to air fully, and yet easy-formation not of its film.Therefore, the multi-layer co-extruded film of this high-barrier can not be used to pack the fresh-keeping good permeability of ask for something, also will have the class article such as food, medicine, fresh flower of certain shape.
Existing coextruded film mainly is to adopt the mode that vacuumizes in the packing that is used for based foods such as fresh meat.If can be in conjunction with the characteristics of this based food, design a kind of packing, existing vacuum-packed permeability to air can be changed in the different circulation stages, keep lower permeability to air when promptly storing, guarantee too much not make a large amount of breedings of germ corrupt because of oxygen as the fresh meat based food; And keep higher permeability to air in the sales stage, and make quick and oxygen reaction generation oxymyoglobin as fresh meat, make the fresh meat based food present cerise, promotion.And the current packaging material has substantially only been paid close attention to the effect that the fresh meat based food can be brought into play in storage, needs to keep high permeability to air to keep the problem of fresh meat product color in sales section and ignored.Therefore, fresh meat product can be effectively protected in exploitation, can make fresh meat product keep the packing of high permeability to air to become a urgent and very necessary task again.
Summary of the invention
The objective of the invention is to, overcome the defective that existing coextruded film packing can not be breathed freely or are difficult for breathing freely, design the coextruded film that a kind of existing air permeability and good is easy to moulding again.
For achieving the above object, technical scheme of the present invention is to adopt the ventilative plastic coextruded film of a kind of energy, it is characterized in that, described coextruded film comprises A layer plastic film, B layer heat-sealing plastic film and the C layer adhered plastics film with permeability to air at least, wherein C layer adhered plastics film is between A layer plastic film and B layer heat-sealing plastic film, and above-mentioned plastic film pushes drawn aftershaping again by co-extrusion machine.
For the ease of making the encapsulation of packaging body with coextruded film, and packaging body is not damaged again, wherein preferable technical scheme is to make that the initial fusion temperature of described A layer plastic film is higher at least 5 degrees centigrade than the initial fusion temperature of described B layer heat-sealing plastic film.
Can be applicable to different types of packed article in order to enable coextruded film, the preferable technical scheme of the present invention also has, in described coextruded film, can contain several layers described A layer plastic film and several layers B layer heat-sealing plastic film, and can arrange arbitrarily, make up between layer and the layer, but between described A layer plastic film and B layer heat-sealing plastic film, accompany C layer adhered plastics film.
According to the requirement difference of packed article to packing correlated performance aspect, the preferable technical scheme of the present invention also has, and described A layer plastic film and B layer heat-sealing plastic film can be selected polymeric type plastics and/or copolymerization class plastics for use.
In order to reduce the cost of coextruded film packing, the preferable technical scheme of the present invention also has, described A layer plastic film is polypropylene and/or polyamide and/or polystyrene and/or polyesters, described B layer heat-sealing plastic film is polyethylene and/or ethylene-vinyl acetate copolymer, and described C layer adhered plastics film is a resin.
In order to help the stretch forming of coextruded film, the preferable technical scheme of the present invention also has, and described C layer adhered plastics film can also can be with the mixing of some kinds of resins with single resin.
For the ease of the permeability to air of adjusting coextruded film and the rigidity after the shaping, the preferable technical scheme of the present invention also has, and the thickness of described C layer adhered plastics film accounts for the ratio of coextruded film gross thickness and can adjust between 10%～60%.
Advantage of the present invention and beneficial effect are: the coextruded film of the ventilative moulding of this a kind of energy not only has air permeability and good but also be easy to the moulding that is stretched.
Description of drawings
Fig. 1 is the coextruded structure scheme drawing of the embodiment of the invention 1;
Fig. 2 is the coextruded structure scheme drawing of the embodiment of the invention 2;
Fig. 3 is the coextruded structure scheme drawing of the embodiment of the invention 3;
Fig. 4 is the coextruded structure scheme drawing of the embodiment of the invention 4;
Fig. 5 is the coextruded structure scheme drawing of the embodiment of the invention 5.
In the literary composition and among the figure:
| The English abbreviation | The Chinese full name |
| ??PP | Polypropylene |
| ??PA | Polyamide (nylon) |
| ??PE | Polyethylene |
| ??EVA | Ethylene-vinyl acetate copolymer |
| ??PVDC | Polyvinylidene chloride |
| The English abbreviation | The Chinese full name |
| ??EVHO | The ethene-vinyl acetate alcohol copolymer |
| ??HOPP | Homo-polypropylene |
| ??COPP | Co-polypropylene |
| ??P | A layer plastic film |
| ??Sealing | B layer heat-sealing plastic film |
| ??Tie | C layer adhered plastics film |
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:
As shown in Figure 1, present embodiment is 7 layers of co-extrusion membrane structure, wherein the thickness of C layer adhered plastics film accounts for 35% of gross thickness, gross thickness is 125 microns, its permeability to air is 1300 a milliliters/sq m. day .1 barometric pressure, B layer heat-sealing plastic film is selected metallocene PE for use, and A layer plastic film is homo-polypropylene (HoPP).Can pass through the moulding of coextrusion film blowing manufactured.
Embodiment 2:
As shown in Figure 2, present embodiment is 8 layers of coextruded structure, wherein the thickness of C layer adhered plastics film accounts for 45% of gross thickness, its permeability to air is 1100 a milliliters/sq m. day .1 barometric pressure, B layer heat-sealing plastic film adopts density to be lower than the ultra-low density polyethylene of 0.890 gram/cm3, and A layer plastic film selected Co-polypropylene (CoPP) for use.Can pass through the moulding of coextrusion film blowing manufactured.
Embodiment 3:
As shown in Figure 3, present embodiment is 5 layers of coextruded structure, wherein the thickness of C layer adhered plastics film accounts for 20% of gross thickness, gross thickness is 100 microns, its permeability to air is 500 a milliliters/sq m. day .1 barometric pressure, B layer heat-sealing plastic film is selected ethylene-vinyl acetate copolymer (EVA) for use, and A layer plastic film selected polyamide (PA) for use.Can pass through the moulding of coextrusion casting manufactured.
Embodiment 4:
As shown in Figure 4, present embodiment is 3 layers of coextruded structure, wherein C layer adhered plastics film is polypropylene (PP) and the elastomeric blend of polypropylene (PP), gross thickness is 60 microns, its permeability to air is 5800 a milliliters/sq m. day .1 barometric pressure, B layer heat-sealing plastic film is selected ethylene-vinyl acetate copolymer (EVA) for use, and A layer plastic film selected polypropylene (PP) for use.Can pass through the moulding of coextrusion film blowing manufactured.
Embodiment 5:
As shown in Figure 5, present embodiment is 3 layers of coextruded structure, wherein air-permeable layer is polypropylene (PP) and the elastomeric blend of polypropylene (PP), gross thickness is 40 microns, its permeability to air is 6800 a milliliters/sq m. day .1 barometric pressure, B layer heat-sealing plastic film is polyethylene (PE), and A layer plastic film is polypropylene (PP).Can make moulding by the coextruding method blown film.
The above only is the preferred implementation of 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 (7)
1. plastic coextruded film of breathing freely, it is characterized in that, described coextruded film comprises A layer plastic film, B layer heat-sealing plastic film and the C layer adhered plastics film with permeability to air at least, wherein C layer adhered plastics film is between A layer plastic film and B layer heat-sealing plastic film, and above-mentioned plastic film pushes drawn aftershaping again by co-extrusion machine.
2. coextruded film as claimed in claim 1 is characterized in that, the initial fusion temperature of described A layer plastic film is higher at least 5 degrees centigrade than the initial fusion temperature of described B layer heat-sealing plastic film.
3. coextruded film as claimed in claim 2, it is characterized in that, in described coextruded film, contain several layers described A layer plastic film and several layers B layer heat-sealing plastic film, and can arrange arbitrarily, make up between layer and the layer, but between described A layer plastic film and B layer heat-sealing plastic film, accompany C layer adhered plastics film.
4. coextruded film as claimed in claim 3 is characterized in that, described A layer plastic film and B layer heat-sealing plastic film are polymeric type plastics and/or copolymerization class plastics.
5. coextruded film as claimed in claim 4, it is characterized in that, described A layer plastic film is polypropylene and/or polyamide and/or polystyrene and/or polyesters, and described B layer heat-sealing plastic film is polyethylene and/or ethylene-vinyl acetate copolymer, and described C layer adhered plastics film is a resin.
6. coextruded film as claimed in claim 5 is characterized in that, described C layer adhered plastics film is single resin or is the mixing of some kinds of resins.
7. as any described coextruded film in the claim 1 to 6, it is characterized in that the thickness of described C layer adhered plastics film accounts for 10%～60% of coextruded film gross thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010210146 CN101870389A (en) | 2010-06-28 | 2010-06-28 | Air-permeable and moldable coextruded film |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010210146 CN101870389A (en) | 2010-06-28 | 2010-06-28 | Air-permeable and moldable coextruded film |
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| CN101870389A true CN101870389A (en) | 2010-10-27 |
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| CN 201010210146 Pending CN101870389A (en) | 2010-06-28 | 2010-06-28 | Air-permeable and moldable coextruded film |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102502110A (en) * | 2011-10-14 | 2012-06-20 | 江阴升辉包装材料有限公司 | Vegetable and fruit plastic packaging box |
| CN103407261A (en) * | 2013-08-19 | 2013-11-27 | 李波 | Composite film and preparation method thereof |
| CN107556743A (en) * | 2017-10-24 | 2018-01-09 | 安徽松泰包装材料有限公司 | A kind of high-transparency nylon CPP laminated films |
| CN113211914A (en) * | 2021-03-26 | 2021-08-06 | 昆山运城塑业有限公司 | Three-layer co-extrusion double-drawing film of PP (polypropylene) and nylon and preparation method thereof |
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2010
- 2010-06-28 CN CN 201010210146 patent/CN101870389A/en active Pending
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102502110A (en) * | 2011-10-14 | 2012-06-20 | 江阴升辉包装材料有限公司 | Vegetable and fruit plastic packaging box |
| CN103407261A (en) * | 2013-08-19 | 2013-11-27 | 李波 | Composite film and preparation method thereof |
| CN103407261B (en) * | 2013-08-19 | 2016-08-03 | 李波 | Laminated film and preparation method thereof |
| CN107556743A (en) * | 2017-10-24 | 2018-01-09 | 安徽松泰包装材料有限公司 | A kind of high-transparency nylon CPP laminated films |
| CN113211914A (en) * | 2021-03-26 | 2021-08-06 | 昆山运城塑业有限公司 | Three-layer co-extrusion double-drawing film of PP (polypropylene) and nylon and preparation method thereof |
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Application publication date: 20101027 |