CN109591412A - A kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure - Google Patents
A kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure Download PDFInfo
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- CN109591412A CN109591412A CN201811444591.6A CN201811444591A CN109591412A CN 109591412 A CN109591412 A CN 109591412A CN 201811444591 A CN201811444591 A CN 201811444591A CN 109591412 A CN109591412 A CN 109591412A
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- layer
- secondary internal
- internal layer
- symmetrical structure
- squeezing
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Classifications
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- 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
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/242—All polymers belonging to those covered by group B32B27/32
-
- 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
- B32B2250/00—Layers arrangement
- B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
-
- 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
Abstract
The present invention relates to a kind of high grade of transparency polyolefin films of five-layer co-squeezing symmetrical structure, the film includes outer layer A, secondary internal layer B and middle layer C, the spread pattern of the outer layer A, secondary internal layer B and middle layer C are the symmetrical structure of A/B/C/B/A, density of the density of the middle layer C greater than the secondary internal layer B makes to form the first optical interface between middle layer C and secondary internal layer B, and first optical interface is for being reflected and being projected to from the light of the secondary internal layer B directive middle layer C；Density of the density of the secondary internal layer B greater than the outer layer A makes to form the second optical interface between secondary internal layer B and outer layer A, and second optical interface is for being reflected and being projected to from the light of the outer layer A directive secondary internal layer B.The present invention effectively reduces cost, and easy to process and production, smooth in appearance, optical effect are good.
Description
Technical field
The present invention relates to a kind of films, thin more particularly to a kind of high grade of transparency polyolefin of five-layer co-squeezing symmetrical structure
Film belongs to membrane structure technical field.
Background technique
Currently, polyethylene/Polypropylene film as excellent heat-sealable material, has obtained most commonly used answer in packaging material
With.In the case where very much, user requires that heat-sealable material has good transparency.Although can be by being cast and downward-blowing water-cooling
Mode obtains the good film of transparency, but the natural limitation of both methods meets with limitation so that it is promoted.Cast film
Production method is suitble to the product of few sample volume, and flexibility is far away from blown film mode；And downward-blowing water-cooling is controlled due to thickness and deviation
It is undesirable, application under the conditions of many is restricted (such as auto-filling, flexible package punch etc.).
The polyolefin film of higher clarity is obtained with traditional blown film mode, has the very big market demand, but necessary
Guarantee in production: 1) suitable processing temperature；2) film obtained at mouth mold good cooling (such as equipment have interior cold charge
It sets)；3) selection of material: the material of low-crystallinity has better transparency performance: the material transparent degree of usual less dense
More preferably, but simultaneously, less dense means the higher cost of raw material.Dedicated high transparency material also needs to pay higher material
Cost；4) suitable structure combination；5) use of processing aid appropriate.It can be seen that the film of traditional requirement high grade of transparency is difficult to
Manufacture and production, therefore need one kind new technical solution and the immanent structure of film is improved and innovated.
Summary of the invention
It is an object of that present invention to provide a kind of high grade of transparency polyolefin films of five-layer co-squeezing symmetrical structure, by film
Structure innovated, keep the transparency of film high, easy to process and production.
The technical scheme to solve the above technical problems is that a kind of high grade of transparency of five-layer co-squeezing symmetrical structure is poly-
Alkene film, the film include outer layer A, secondary internal layer B and middle layer C, the arrangement of the outer layer A, secondary internal layer B and middle layer C
Form is the symmetrical structure of A/B/C/B/A, the density of the density of the middle layer C greater than the secondary internal layer B make middle layer C and time
The first optical interface is formed between inner layer B, first optical interface is used for the light from the secondary internal layer B directive middle layer C
Line is reflected and is projected；Density of the density of the secondary internal layer B greater than the outer layer A makes to be formed between secondary internal layer B and outer layer A
Second optical interface, second optical interface is for being reflected and being thrown to from the light of the outer layer A directive secondary internal layer B
It penetrates.
The preferred embodiment of high grade of transparency polyolefin film as five-layer co-squeezing symmetrical structure, the outer layer A, secondary internal layer B
Polyolefin material is used with middle layer C, the polyolefin material includes at least one of polyethylene and polypropylene.
The preferred embodiment of high grade of transparency polyolefin film as five-layer co-squeezing symmetrical structure, the outer layer A use Tao Shi
The single polyolefine material of m-LLDPE INNATE TH60 of chemical production, the secondary internal layer B are produced using Exxon Mobil Corporation
The single polyolefine material of LLDPE 1002YB, the middle layer C using CNOOC and Shell Petrochemicals Co., Ltd production
The single polyolefine material of 2420H.
The preferred embodiment of high grade of transparency polyolefin film as five-layer co-squeezing symmetrical structure, the outer layer A use angstrom gram
The single polyolefine material of LLDPE 1002YB of gloomy Mobil Corporation production, the secondary internal layer B is using the production of Northern Europe chemical company
DOW 2042G and LLDPE FB2230 mixing polyolefine material, the middle layer C use the LLDPE of Dow Chemical's production
The single polyolefine material of DOWLEX 2042G.
The preferred embodiment of high grade of transparency polyolefin film as five-layer co-squeezing symmetrical structure, the outer layer A use angstrom gram
The single polyolefine material of m-LLDPE 1018CA of gloomy Mobil Corporation production, the secondary internal layer B are produced using Northern Europe chemical company
FB2310 and PP RB707CF mixing polyolefine material, the middle layer C use Northern Europe chemical company production LLDPE
The single polyolefine material of FB2310.
The preferred embodiment of high grade of transparency polyolefin film as five-layer co-squeezing symmetrical structure, the middle layer C and time in
Density contrast between layer B is 0.006~0.007g/cm3。
The preferred embodiment of high grade of transparency polyolefin film as five-layer co-squeezing symmetrical structure, the outer layer A secondary internal layer B it
Between density contrast be 0.006~0.007g/cm3。
The preferred embodiment of high grade of transparency polyolefin film as five-layer co-squeezing symmetrical structure, the film with a thickness of 50
The thickness of micron, the outer layer A, secondary internal layer B and middle layer C are followed successively by 6 microns, 12 microns and 14 microns.
The preferred embodiment of high grade of transparency polyolefin film as five-layer co-squeezing symmetrical structure, the film with a thickness of 50
The thickness of micron, the outer layer A, secondary internal layer B and middle layer C are followed successively by 15 microns, 7.5 microns and 5 microns.
The preferred embodiment of high grade of transparency polyolefin film as five-layer co-squeezing symmetrical structure, the film with a thickness of 50
The thickness of micron, the outer layer A, secondary internal layer B and middle layer C are followed successively by 10 microns, 10 microns and 10 microns.
The beneficial effects of the present invention are: the spread pattern of outer layer A, secondary internal layer B and middle layer C are the symmetrical of A/B/C/B/A
Density of the density greater than secondary internal layer B of structure, middle layer C makes to form the first optical interface between middle layer C and secondary internal layer B, secondary
Density of the density of inner layer B greater than outer layer A makes to form the second optical interface between secondary internal layer B and outer layer A, and optical interface can be right
Incident light reflection and transmission realize that light is superimposed, can significantly improve the transparency for improving polyolefin film, especially
Needing the film of high transparency and high-stiffness simultaneously, (high-stiffness polyethylene film needs the application of the polyethylene of higher density, thus
Often bring the decline of transparency), cost is effectively reduced, easy to process and production, smooth in appearance, optical effect are good.
Detailed description of the invention
Fig. 1 is that the high grade of transparency polyolefin film structure of the five-layer co-squeezing symmetrical structure provided in the embodiment of the present invention 1 is shown
It is intended to；
Fig. 2 is that the high grade of transparency polyolefin film structure of the five-layer co-squeezing symmetrical structure provided in the embodiment of the present invention 2 is shown
It is intended to；
Fig. 3 is that the high grade of transparency polyolefin film structure of the five-layer co-squeezing symmetrical structure provided in the embodiment of the present invention 3 is shown
It is intended to；
Fig. 4 is the high grade of transparency polyolefin film optical principle schematic diagram of five-layer co-squeezing symmetrical structure of the invention；
Wherein, 1, outer layer A；2, secondary internal layer B；3, middle layer C；4, the first optical interface；5, the second optical interface.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair
It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not
Similar improvement is done in the case where violating intension of the present invention, therefore the present invention is not limited by the specific embodiments disclosed below.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.
Embodiment 1:
Referring to Fig. 1 and Fig. 4, a kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure, the film packet are provided
The spread pattern for including outer layer A1, secondary internal layer B2 and middle layer C3, the outer layer A1, secondary internal layer B2 and middle layer C3 is A/B/C/B/
Density of the density greater than the secondary internal layer B2 of the symmetrical structure of A, the middle layer C3 makes between middle layer C3 and secondary internal layer B2
The first optical interface 4 is formed, first optical interface 4 is used to carry out to from the light of the secondary internal layer B2 directive middle layer C3
Reflection and projection；Density of the density of the secondary internal layer B2 greater than the outer layer A1 makes to be formed the between secondary internal layer B2 and outer layer A1
Two optical interfaces 5, second optical interface 5 is for being reflected and being thrown to from the light of the outer layer A1 directive secondary internal layer B2
It penetrates.
Specifically, outer layer A1, secondary internal layer B2 and middle layer C3 are single polyolefine material；The material m- of outer layer A1
Material LLDPE1002YB (the Ai Ke of LLDPE INNATE TH60 (DOW Chemical, MFR=2, density=0.912), secondary internal layer B2
Gloomy Mobil Corporation, MFR=2, density=0.918), the material 2420H of middle layer C3 (CNOOC and Shell Petrochemicals Co., Ltd,
MFR=2, density=0.924).Each layer thickness proportion 12%/24%/28%/24%/12% of A/B/C/B/A, film are whole thick
Degree is 50 microns, i.e. each layer of A/B/C/B/A is with a thickness of 6/12/14/12/6 micron, through coextrusion membrane blowing production line production.
The high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure provided in this embodiment, optical interface can be to incidences
Light reflection and transmission, realize light it is superimposed, can significantly improve improve polyolefin film transparency, especially while
Needing the film of high transparency and high-stiffness, (high-stiffness polyethylene film needs the application of the polyethylene of higher density, thereby tends to
Bring the decline of transparency), cost is effectively reduced, easy to process and production, smooth in appearance, optical effect is good, is suitable for height
Film that is transparent and having excellent machinability, and there is certain low-temperature heat-sealing performance to require.
Embodiment 2:
Referring to fig. 2 and Fig. 4, a kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure, the film include outer
The spread pattern of layer A1, secondary internal layer B2 and middle layer C3, the outer layer A1, secondary internal layer B2 and middle layer C3 are A/B/C/B/A's
Density of the density greater than the secondary internal layer B2 of symmetrical structure, the middle layer C3 makes to be formed between middle layer C3 and secondary internal layer B2
First optical interface 4, first optical interface 4 is for reflecting from the light of the secondary internal layer B2 directive middle layer C3
And projection；Density of the density of the secondary internal layer B2 greater than the outer layer A1 makes to form the second light between secondary internal layer B2 and outer layer A1
Educational circles face 5, second optical interface 5 is for being reflected and being projected to from the light of the outer layer A1 directive secondary internal layer B2.
Specifically, outer layer A1 and middle layer C3 are single polyolefine material, secondary internal layer B2 is mixing polyolefine material.Outside
The material of layer A1 is LLDPE 1002YB (Exxon Mobil Corporation, MFR=2, density=0.918), the material of middle layer C3
LLDPE DOWLEX 2042G (Dow Chemical, MFR=2, density=0.930), the material DOW of secondary internal layer B2
(Northern Europe chemical company, MFR=0.2, density=0.923, mixing material are average close by 2042G15%+LLDPE FB2230 85%
Spend D=0.924), each layer thickness proportion 30%/15%/10%/15%/30% of A/B/C/B/A, film integral thickness is 50 micro-
Rice, i.e. each layer of A/B/C/B/A is with a thickness of 15/7.5/5/7.5/15 microns, through coextrusion membrane blowing production line production.It is blown through coextrusion
Film production line production.
The high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure provided in this embodiment, optical interface can be to incidences
Light reflection and transmission, realize light it is superimposed, can significantly improve improve polyolefin film transparency, especially while
Needing the film of high transparency and high-stiffness, (high-stiffness polyethylene film needs the application of the polyethylene of higher density, thereby tends to
Bring the decline of transparency), cost is effectively reduced, easy to process and production, smooth in appearance, optical effect is good, is suitable for height
General purpose film that is transparent and having certain stiffness requirement.
Embodiment 3:
Referring to Fig. 3 and Fig. 4, a kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure, the film includes outer
The spread pattern of layer A1, secondary internal layer B2 and middle layer C3, the outer layer A1, secondary internal layer B2 and middle layer C3 are A/B/C/B/A's
Density of the density greater than the secondary internal layer B2 of symmetrical structure, the middle layer C3 makes to be formed between middle layer C3 and secondary internal layer B2
First optical interface 4, first optical interface 4 is for reflecting from the light of the secondary internal layer B2 directive middle layer C3
And projection；Density of the density of the secondary internal layer B2 greater than the outer layer A1 makes to form the second light between secondary internal layer B2 and outer layer A1
Educational circles face 5, second optical interface 5 is for being reflected and being projected to from the light of the outer layer A1 directive secondary internal layer B2.
Specifically, outer layer A1 and middle layer C3 are single polyolefine material, secondary internal layer B2 is mixing polyolefine material.Outside
The material of layer A1 is m-LLDPE 1018CA (Exxon Mobil Corporation, MFR=1, density=0.918), the material of middle layer C3
The material FB2310 80%+PP of LLDPE FB2310 (Northern Europe chemical company, MFR=0.2, density=0.931), secondary internal layer B2
RB707CF 20% (Northern Europe chemical company, MFR=2, density=0.905, secondary internal layer mixing material averag density D=0.925),
Each layer thickness proportion 20%/20%/20%/20%/20% of A/B/C/B/A, film integral thickness are 50 microns, i.e. A/B/C/B/
Each layer of A is with a thickness of 10/10/10/10/10 micron, through coextrusion membrane blowing production line production.
The high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure provided in this embodiment, optical interface can be to incidences
Light reflection and transmission, realize light it is superimposed, can significantly improve improve polyolefin film transparency, especially while
Needing the film of high transparency and high-stiffness, (high-stiffness polyethylene film needs the application of the polyethylene of higher density, thereby tends to
Bring the decline of transparency), cost is effectively reduced, easy to process and production, smooth in appearance, optical effect is good, is suitable for height
Film that is transparent and having certain stiffness and heat resistant requirements.
Transparency test data is carried out to the film of embodiment 1-3 below, contrast test is the structure materials of embodiment 1-3
The test result that single layer blows 50 micron film structures is blended using tradition, haze value is smaller, and glossiness is bigger, film clarity
Better, the cooling effect in film manufacturing processes is better, and transparency is higher, and the results are shown in Table 1:
The film clarity test data of 1 embodiment 1-3 of table
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure, it is characterised in that: the film includes outer layer A
(1), secondary internal layer B (2) and middle layer C (3), the spread pattern of the outer layer A (1), secondary internal layer B (2) and middle layer C (3) are A/
The symmetrical structure of B/C/B/A, the density that the density of the middle layer C (3) is greater than the secondary internal layer B (2) make middle layer C (3) and
It is formed between secondary internal layer B (2) the first optical interface (4), first optical interface (4) to from the secondary internal layer B (2) for penetrating
It is reflected and is projected to the light of middle layer C (3)；The density that the density of the secondary internal layer B (2) is greater than the outer layer A (1) makes
It is formed between secondary internal layer B (2) and outer layer A (1) the second optical interface (5), second optical interface (5) is used for from described outer
The light of layer A (1) directive secondary internal layer B (2) is reflected and is projected.
2. a kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure according to claim 1, it is characterised in that:
The outer layer A (1), secondary internal layer B (2) and middle layer C (3) use polyolefin material, and the polyolefin material includes at least poly- second
One of alkene and polypropylene.
3. a kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure according to claim 2, it is characterised in that:
The outer layer A (1) uses the single polyolefine material of m-LLDPE INNATE TH60 of DOW Chemical production, the secondary internal layer B
(2) the single polyolefine material of LLDPE 1002YB of Exxon Mobil Corporation's production, sea in middle layer C (3) use are used
The single polyolefine material of 2420H of Royal Dutch Shell Chemical Co., Ltd. production.
4. a kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure according to claim 2, it is characterised in that:
The outer layer A (1) uses the single polyolefine material of LLDPE 1002YB of Exxon Mobil Corporation's production, the secondary internal layer B (2)
DOW 2042G and LLDPE the FB2230 mixing polyolefine material produced using Northern Europe chemical company, the middle layer C (3) are adopted
The single polyolefine material of LLDPE DOWLEX 2042G produced with Dow Chemical.
5. a kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure according to claim 2, it is characterised in that:
The outer layer A (1) uses the single polyolefine material of m-LLDPE 1018CA of Exxon Mobil Corporation's production, the secondary internal layer B
(2) using FB2310 the and PP RB707CF mixing polyolefine material of Northern Europe chemical company production, the middle layer C (3) is used
The single polyolefine material of LLDPE FB2310 of Northern Europe chemical company production.
6. a kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure according to claim 1, it is characterised in that:
Density contrast between the middle layer C (3) and secondary internal layer B (2) is 0.006~0.007g/cm3。
7. a kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure according to claim 1, it is characterised in that:
Density contrast between outer layer A (1) the secondary internal layer B (2) is 0.006~0.007g/cm3。
8. a kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure according to claim 1, it is characterised in that:
The film with a thickness of 50 microns, the thickness of the outer layer A (1), secondary internal layer B (2) and middle layer C (3) be followed successively by 6 microns,
12 microns and 14 microns.
9. a kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure according to claim 1, it is characterised in that:
The film with a thickness of 50 microns, the thickness of the outer layer A (1), secondary internal layer B (2) and middle layer C (3) be followed successively by 15 microns,
7.5 microns and 5 microns.
10. a kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure according to claim 1, feature exist
In: the film with a thickness of 50 microns, it is micro- that the thickness of the outer layer A (1), secondary internal layer B (2) and middle layer C (3) is followed successively by 10
Rice, 10 microns and 10 microns.
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| CN201811444591.6A CN109591412A (en) | 2018-11-29 | 2018-11-29 | A kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure |
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| CN201811444591.6A CN109591412A (en) | 2018-11-29 | 2018-11-29 | A kind of high grade of transparency polyolefin film of five-layer co-squeezing symmetrical structure |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5268220A (en) * | 1989-05-11 | 1993-12-07 | Nippon Petrochemicals Company, Limited | Polypropylene film |
| US20070082185A1 (en) * | 2005-10-12 | 2007-04-12 | Japan Polypropylene Corporation | Multi-layered film |
| CN102196906A (en) * | 2008-10-23 | 2011-09-21 | 埃克森美孚化学专利公司 | High MIR linear polye thylenes and coextruded films therefrom |
| CN106003953A (en) * | 2016-05-12 | 2016-10-12 | 烟台丰福莱薄膜科技有限公司 | High-transparency polyethylene film of symmetrical structure |
| CN106965511A (en) * | 2016-01-19 | 2017-07-21 | 杭州德雅包装有限公司 | A kind of high grade of transparency high-strength hot shrink film |
-
2018
- 2018-11-29 CN CN201811444591.6A patent/CN109591412A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5268220A (en) * | 1989-05-11 | 1993-12-07 | Nippon Petrochemicals Company, Limited | Polypropylene film |
| US20070082185A1 (en) * | 2005-10-12 | 2007-04-12 | Japan Polypropylene Corporation | Multi-layered film |
| CN102196906A (en) * | 2008-10-23 | 2011-09-21 | 埃克森美孚化学专利公司 | High MIR linear polye thylenes and coextruded films therefrom |
| CN106965511A (en) * | 2016-01-19 | 2017-07-21 | 杭州德雅包装有限公司 | A kind of high grade of transparency high-strength hot shrink film |
| CN106003953A (en) * | 2016-05-12 | 2016-10-12 | 烟台丰福莱薄膜科技有限公司 | High-transparency polyethylene film of symmetrical structure |
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