CN103802424B - Polyethylene strong cross laminated composite film and production process thereof - Google Patents
Polyethylene strong cross laminated composite film and production process thereof Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- -1 Polyethylene Polymers 0.000 title claims abstract description 24
- 239000004698 Polyethylene Substances 0.000 title claims abstract description 23
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 23
- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 238000007664 blowing Methods 0.000 claims abstract description 10
- 238000010096 film blowing Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 4
- 229920001903 high density polyethylene Polymers 0.000 claims description 26
- 239000004700 high-density polyethylene Substances 0.000 claims description 26
- 229920001684 low density polyethylene Polymers 0.000 claims description 25
- 239000004702 low-density polyethylene Substances 0.000 claims description 25
- 239000003963 antioxidant agent Substances 0.000 claims description 24
- 235000006708 antioxidants Nutrition 0.000 claims description 24
- 239000012528 membrane Substances 0.000 claims description 24
- 230000003078 antioxidant effect Effects 0.000 claims description 22
- 229920001179 medium density polyethylene Polymers 0.000 claims description 22
- 239000004701 medium-density polyethylene Substances 0.000 claims description 22
- BLDFSDCBQJUWFG-UHFFFAOYSA-N 2-(methylamino)-1,2-diphenylethanol Chemical compound C=1C=CC=CC=1C(NC)C(O)C1=CC=CC=C1 BLDFSDCBQJUWFG-UHFFFAOYSA-N 0.000 claims description 20
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 20
- 239000004595 color masterbatch Substances 0.000 claims description 13
- 238000005516 engineering process Methods 0.000 claims description 13
- 238000005520 cutting process Methods 0.000 claims description 11
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 11
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 11
- 150000001875 compounds Chemical class 0.000 claims description 8
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 238000001125 extrusion Methods 0.000 abstract 2
- 238000013329 compounding Methods 0.000 abstract 1
- 239000010408 film Substances 0.000 description 65
- 238000000034 method Methods 0.000 description 15
- 239000004594 Masterbatch (MB) Substances 0.000 description 13
- 238000001816 cooling Methods 0.000 description 6
- 238000004513 sizing Methods 0.000 description 6
- 230000005465 channeling Effects 0.000 description 3
- 229920006262 high density polyethylene film Polymers 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000004078 waterproofing Methods 0.000 description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 2
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- LCJHLOJKAAQLQW-UHFFFAOYSA-N acetic acid;ethane Chemical compound CC.CC(O)=O LCJHLOJKAAQLQW-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 235000010985 glycerol esters of wood rosin Nutrition 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 230000002902 bimodal effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000005070 ripening Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 125000003003 spiro group Chemical group 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 230000017105 transposition Effects 0.000 description 1
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a production process of polyethylene strong cross laminated composite film. The production process is characterized by comprising the following steps: A, placing materials of an outer layer, a middle layer and an inner layer in a three-layer co-extrusion film blowing machine in formula proportion to perform co-extrusion film blowing so as to form a first blowing tube film with the thickness of 0.12-0.18 mm; B, performing secondary heating stretching on the first blowing tube film on a stretcher to form a second blowing tube film with the thickness of 0.04-0.06 mm; C, spirally slitting the second blowing tube film stretched twice, and beveling at the angle of 40-50 DEG C to obtain sheet films; and D, crossing and compounding. The production process has the advantages that the produced film is high in stretching strength, good in heat resistance, basically consistent in transverse and longitudinal strength and extension, and free of the phenomena of empty drum, water-expelling and leaking.
Description
Technical field
The present invention relates to polyethylene strength crossed composite membrane manufacture field, relate in particular to a kind of polyethylene strength crossed composite membrane and production technology thereof.
Background technology
The mode of the polyethylene strength intersection film waterproof roll of waterproofing membrane production enterprise production both at home and abroad has bigger difference.External waterproofing membrane production enterprise is usually first to be scratched by the modified pitch self-adhesive of high temperature and is being resistant to more than on 170 degree of high temperature PET isolating membrane, being then passed through cooling down and be covered with polyethylene strength intersection film again, such asynchronous method mode of production does not has resistant to elevated temperatures use condition to polyethylene strength intersection film.And domestic waterproofing membrane production enterprise mostly uses isolating membrane and polyethylene strength to intersect the Synchronos method mode of production of film overlay film simultaneously, polyethylene strength intersects film needs the modified pitch self-adhesive of directly 150 degree of high temperature above of contact.Therefore the heat-resisting quantity of polyethylene strength intersection film is required higher.
, generally there is longitudinal tensile strength and be more than laterally in common HDPE film the most for once inflation, horizontal expansion rate is more than longitudinally, i.e. anisotropy.Waterproof construction is completed at waterproof roll, after the thermal expansion of daytime insolation and the shrinkage of night cooling, face can produce a large amount of deformational stress, and due to anisotropy, longitudinal ability of anti-deformation is strong, laterally ability of anti-deformation is weak, cause face vertically and horizontally deformation inconsistent, produce a large amount of fold, even hollowing, make waterproof roll depart from from formation level, cause channeling water, leak.
Summary of the invention
It is an object of the invention to provide the polyethylene strength crossed composite membrane that a kind of heat-resisting quantity is good.
For achieving the above object, technical scheme is as follows: a kind of polyethylene strength crossed composite membrane, it is characterized in that described composite membrane is made up of outer layer, middle level and internal layer, with mass ratio range, the formula of described outer layer is: HDPE:LDPE:LLDPE:TPE: color masterbatch: antioxidant: MDPE=100:4.5 ~ 5.5:5 ~ 6:10 ~ 15:3 ~ 4:0.8 ~ 1:26 ~ 29；The formula in middle level is: HDPE:LDPE:TPE: color masterbatch: antioxidant: MDPE=100:13 ~ 16:10 ~ 15:2.5 ~ 3:1 ~ 1.3:15 ~ 19；The formula of internal layer is HDPE:LDPE:EVA: color masterbatch: antioxidant: MDPE=100:4 ~ 5:20 ~ 15:8 ~ 10:2 ~ 3:20 ~ 24.Wherein HDPE is high density polyethylene (HDPE), and LDPE is Low Density Polyethylene, and LLDPE is linear low density polyethylene, and MDPE is medium density polyethylene.Antioxidant is Hinered phenols, and EVA is ethane-acetic acid ethyenyl (vinyl acetate) ester copolymer.Color masterbatch is with Low Density Polyethylene for carrier master batch, and outer layer uses black agglomerate, middle level to use white master batch, and internal layer uses green master batch.
Another object of the present invention is to provide the production technology of a kind of polyethylene strength crossed composite membrane, the polyethylene strength crossed composite membrane hot strength of production and ability of anti-deformation are good.
To achieve these goals, technical scheme is as follows: the production technology of a kind of polyethylene strength crossed composite membrane, it is characterized in that described production technology comprises the following steps: three-layer co-extruded inflation film manufacturing machine coextrusion film blowing put into by the material of A, outer layer, middle level and internal layer, forming first and blow a film, the first thickness blowing a film is 0.12～0.18mm；B, described first blown film carrying out on stretching-machine post bake stretching, form second and blow a film, the second thickness blowing a film is 0.04～0.06mm；C, second after succeeding stretch is blown a film carry out spiral cutting, cut sth. askew film in blocks with the angle of 30 ~ 60 degree；D, intersection are compound.
The present invention utilizes post bake drawing process and multiple film hot composition process, can effectively reduce the thickness of film and significantly improve hot strength, and common HDPE film is 0.14 ~ 0.16mm, and pulling force is 150N ~ 200N/50mm, and hot strength is 25 ~ 30MPa；And the thickness of the polyethylene strength crossed composite membrane of the present invention is only 0.08 ~ 0.12mm, pulling force can reach 350 N/50mm, and hot strength can make a call to 50 ~ 65MPa.Non-deformability is considerably beyond common HDPE film, under the influence of same external condition, needs a power the biggest that it just can be made to be deformed.After tested, contrast Wei Luolang strong, thin films, affected by same pulling force, during such as 135N/25mm, the displacement of the polyethylene strength crossed composite membrane of the present invention is about 30mm, and elongation percentage is about 60%, and the displacement of Wei Luolang strong, thin films is about 200mm, elongation percentage is about 400%, so the non-deformability of the polyethylene strength crossed composite membrane of the present invention is better than Wei Luolang strong, thin films.The present invention uses the helical of 40 ~ 50 degree to cut sth. askew and intersects the mode of laminating production, its transverse and longitudinal intensity, extend basically identical, i.e. isotropic.Face vertically and horizontally deformation is basically identical, it is to avoid hollowing, channeling water, the phenomenon leaked occur.Therefore, it is an advantage of the current invention that the film hot strength produced is high, heat resistance is good, its transverse and longitudinal intensity, extend basically identical, it is to avoid hollowing, channeling water, the phenomenon leaked occur.
Accompanying drawing explanation
Fig. 1 is spiral cutting schematic diagram in the present invention.
Detailed description of the invention
A kind of production technology of polyethylene strength crossed composite membrane, it is characterized in that described production technology comprises the following steps: A, by formula proportion the material of above-mentioned outer layer, middle level and internal layer put into three-layer co-extruded inflation film manufacturing machine coextrusion film blowing, forming first and blow a film, the first thickness blowing a film is 0.12 ~ 0.18mm；B, described first blown film carrying out on stretching-machine post bake stretching, form second and blow a film, the second thickness blowing a film is 0.04 ~ 0.06mm；C, second after succeeding stretch is blown a film carry out spiral cutting, cut sth. askew film in blocks with the angle of 30 ~ 60 degree；D, intersection are compound.
Wherein intersect and be combined and can carry out by following three kinds of methods.The first, by the hot composite transposition membrane structure of patent 201220535891.7(mono-kind), the film that above-mentioned C two-layer orientation intersects is carried out heat compound；The second, the film one side that above-mentioned C two-layer orientation is intersected is coated or aqueous acrylamide ester gum is coated on two sides, predrying after carry out pressing, then at a temperature of 40-50 degree, carry out ripening；3rd, line style is become to extrude by flat-mould head die orifice after spiro rod plasticizing hp-ldpe, stretching postadhesion in spiral cutting sheet film surface, by a piece of stretched film with coating Low Density Polyethylene stretched film make its along draw direction in intersect each other situation cooling press bonding roller effect under moment cold formed be combined.Cross angle 60 ~ 120 degree between the two membranes that described intersection is compound.Using the first hot complex method, its advantage is to fuse into one mutually, will not be layered, and fastness is high, and leftover pieces reclaim well；But because there being hot sealing layer, intensity is lower relative to other two kinds；Using the second aqueous acrylamide ester gum complex method, its advantage is environmental protection, but compound fastness is hotter compound and film is combined lower, and to dry through longer drying tunnel, also wants recurring, and the production cycle is long, and yield is relatively low；Using the third complex method, fastness is moderate, and speed of production is fast, and leftover pieces reclaim the best, and overall appearance is good, and horizontal thickness uniformity does not has compound good of water-base cement.
According to a preferred embodiment of the invention, described composite membrane is made up of outer layer, middle level and internal layer, with mass ratio range, the formula of described outer layer is: HDPE:LDPE:LLDPE:TPE: color masterbatch: antioxidant: MDPE=100:4.5 ~ 5.5:5 ~ 6:10 ~ 15:3 ~ 4:0.8 ~ 1:26 ~ 29；The formula in middle level is: HDPE:LDPE:TPE: color masterbatch: antioxidant: MDPE=100:13 ~ 16:10 ~ 15:2.5 ~ 3:1 ~ 1.3:15 ~ 19；The formula of internal layer is HDPE:LDPE:EVA: color masterbatch: antioxidant: MDPE=100:4 ~ 5:15 ~ 20:8 ~ 10:2 ~ 3:20 ~ 24.Wherein HDPE is high density polyethylene (HDPE), and LDPE is Low Density Polyethylene, and LLDPE is linear low density polyethylene, and MDPE is medium density polyethylene.Antioxidant is hindered phenol anti-oxidants (as used hydroquinone antioxidant, model is AY-03), and EVA is ethane-acetic acid ethyenyl (vinyl acetate) ester copolymer.Color masterbatch is with Low Density Polyethylene for carrier master batch, adds paint and makes, and its ectomesoderm uses black agglomerate, middle level to use white master batch, and internal layer uses green master batch.
The three-layer co-extruded blown film techniques of the present invention, imparts three layers of independent physical characteristic of a film, allows outer layer have preferable heatproof and thinks and longitudinal strength, heavily to pack HDPE, adds color masterbatch；Allow middle level have preferably laterally inflation type, be allowed to during succeeding stretch be difficult to holes gas leakage, based on metallocene, and add white master batch and set off by contrast covering power providing certain；Allow nexine have preferable cohesive and longitudinal strength, based on bimodal HDPE, be auxiliary with LLDPE, EVA, add color masterbatch.Elastomer and the addition of TPE, add the toughness of film, after the stretch, the most easily collapse out when cutting, but addition is unsuitable too much, and the most pre-heat-shrinkable strengthens.
According to the first embodiment of the present invention, with mass ratio range, the formula of described outer layer is: HDPE:LDPE:LLDPE:TPE: black agglomerate: antioxidant: MDPE=100:4.5:5:10:3:0.8:26；The formula in middle level is: HDPE:LDPE:TPE: white master batch: antioxidant: MDPE=100:13:10:2.5:1:15；The formula of internal layer is HDPE:LDPE:EVA: green master batch: antioxidant: MDPE=100:4:20:8:2:20.
According to the second embodiment of the present invention, with mass ratio range, the formula of described outer layer is: HDPE:LDPE:LLDPE:TPE: black agglomerate: antioxidant: MDPE=100:5.5:6:15:4:1:29；The formula in middle level is: HDPE:LDPE:TPE: white master batch: antioxidant: MDPE=100:16:15:3:1.3:19；The formula of internal layer is HDPE:LDPE:EVA: green master batch: antioxidant: MDPE=100:5:15:10:3:24.
According to the third embodiment of the invention, with mass ratio range, the formula of described outer layer is: HDPE:LDPE:LLDPE:TPE: black agglomerate: antioxidant: MDPE=100:5:5.5:12:3.5:0.9:27；The formula in middle level is: HDPE:LDPE:TPE: white master batch: antioxidant: MDPE=100:15:12:2.8:1.2:17；The formula of internal layer is HDPE:LDPE:EVA: green master batch: antioxidant: MDPE=100:4.5:18:9:2.5:22.
Blow after a film carries out secondary inflation stretching by second, the longitudinal extension before yield limit is removed, thus reduces the elongation percentage of final polyethylene strength crossed composite membrane so that it is be not likely to produce the purpose of deformation；Thickness is stretched to 1/3rd of former cylinder film, and after molecularly oriented, longitudinal tensile strength improves about 3 times.Control well stretching degree, i.e. draw ratio, become the key into secondary inflation drawing process.If draw ratio is the lowest, then thickness is the thickest, and hot strength is on the low side, and elongation percentage is higher；If draw ratio is the highest, cylinder film being stretched in excess yield limit, molecularly oriented is excessive, then the longitudinal extension rate that can cause film is on the low side, even cannot be carried out next process.
In the present invention, utilize heating and traction speed ratio difference that cylinder film carries out succeeding stretch, temperature and the setting of traction speed ratio, be known as the key problem in technology point of succeeding stretch technique.In the present invention, utilize heating and traction speed ratio difference that cylinder film carries out succeeding stretch, temperature and the setting of traction speed ratio, be known as the key problem in technology point of succeeding stretch technique.In succeeding stretch technique, after preheating zone, thermal treatment zone heating, stretch at drawing zone, the most cooled district, refined zone and the cooling of air-cooled district.Cylinder film is arranged between drive roll and driven roll, uses the hauling speed difference between drive roll and driven roll to realize the drawing effect of a film, and wherein the first hauling speed is the roll surface speed of drive roll, and the second hauling speed is the roll surface speed of driven roll.
According to a preferred embodiment of the invention, in described succeeding stretch technique, for black cylinder film, preheating zone temperature is 285 degree, and Heating Zone Temperature is 340 degree, and drawing zone temperature is 350 degree, cooling zone temperature is 180 degree, and refined zone temperature is 240 degree, and air-cooled district temperature is 40 degree；For green cylinder film, preheating zone temperature is 305 degree, and Heating Zone Temperature is 350 degree, and drawing zone temperature is 373 degree, and cooling zone temperature is 190 degree, and refined zone temperature is 230 degree, and air-cooled district temperature is 40 degree；For black cylinder film, the traction speed ratio of the first hauling speed and the second hauling speed is 4.2 optimal, and for green cylinder film, and the traction speed ratio of the first hauling speed and the second hauling speed is 4.17 to be optimal.
After succeeding stretch second is blown a film and carries out spiral cutting, cut sth. askew in SD sheet film with the angle of 45 degree, make the stretching force of SD sheet film, elongation percentage reach unanimity on transverse and longitudinal.It as shown is spiral cutting schematic diagram.As shown in the figure, described cylinder film 2 is wound in a rotating shaft 1, described rotating shaft 1 can carry out horizontally rotating and vertical rotary simultaneously, the subdivision end of described cylinder film 2 is enclosed within outside a subdivision sizing cylinder 5, the external diameter of subdivision sizing cylinder 5 is slightly less than the diameter of a film, cylinder film is when cylinder 3 of subdivision sizing cylinder, tube head supports into tubular, cut-off knife is cut sth. askew a film along 45 degree of angle directions, the horizontal rotation of rotating shaft 1 makes to discharge cylinder film, vertical rotary then makes a film follow subdivision sizing cylinder rotation, in order to cut-off knife carries out spiral cutting, forms oblique section film 6.Due to cylinder film diameter can not complete stability, it requires that subdivision sizing cylinder possesses certain adaptivity, when cylinder film is bigger than normal, cylinder head becomes greatly the most therewith, to strut a film completely, gives the tension force that a film is certain, the angle shakiness that prevents from cutting or cut uneven；When cylinder film is less than normal, cylinder head also diminishes accordingly therewith, prevents from bursting a film.The oval subdivision sizing cylinder of this reducing is specifically shown in patent 201220536317.3(mono-kind of applicant's previous application can the spiral cutting machine of variation ellipse center of circle focal length) and 201220535860.1(mono-kind can cut sth. askew the device of multiple films simultaneously).
Above content is to combine concrete preferred implementation further description made for the present invention, it is impossible to assert that the present invention is embodied as being confined to these explanations above-mentioned.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, it is also possible to make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (2)
1. the production technology of a polyethylene strength crossed composite membrane, it is characterized in that described production technology comprises the following steps: A, the material of outer layer, middle level and internal layer is put into three-layer co-extruded inflation film manufacturing machine coextrusion film blowing, form first and blow a film, by weight percentage, the formula of described outer layer is: HDPE:LDPE:LLDPE:TPE: color masterbatch: antioxidant: MDPE=100:4.5 ~ 5.5:5 ~ 6:10 ~ 15:3 ~ 4:0.8 ~ 1:26 ~ 29；The formula in middle level is: HDPE:LDPE:TPE: color masterbatch: antioxidant: MDPE=100:13 ~ 16:10 ~ 15:2.5 ~ 3:1 ~ 1.3:15 ~ 19；The formula of internal layer is HDPE:LDPE:EVA: color masterbatch: antioxidant: MDPE=100:4 ~ 5:20 ~ 15:8 ~ 10:2 ~ 3:20 ~ 24, and the first thickness blowing a film is 0.12 ~ 0.18mm；B, described first blown film carrying out on stretching-machine post bake stretching, form second and blow a film, the second thickness blowing a film is 0.04 ~ 0.06mm；C, second after succeeding stretch is blown a film carry out spiral cutting, cut sth. askew film in blocks with the angle of 40 ~ 50 degree；D, intersection are compound.
2.The production technology of polyethylene strength crossed composite membrane as claimed in claim 1, it is characterised in that antioxidant uses hindered phenol anti-oxidants.
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| CN201410048324.2A CN103802424B (en) | 2013-12-26 | 2014-02-12 | Polyethylene strong cross laminated composite film and production process thereof |
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| CN201410048324.2A CN103802424B (en) | 2013-12-26 | 2014-02-12 | Polyethylene strong cross laminated composite film and production process thereof |
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| CN104859948A (en) * | 2015-06-12 | 2015-08-26 | 成都市益诚包装有限公司 | High impact force-resistant polyethylene heat shrink film and film blowing process |
| CN105150565B (en) * | 2015-07-07 | 2017-11-28 | 浙江新高包装有限公司 | HDPE composite package films |
| CN105644091A (en) * | 2015-12-29 | 2016-06-08 | 秦皇岛市地维建材有限公司 | Preparation method of TPO crossed compound sheet self-adhesion waterproof coiled material |
| CN109016716B (en) * | 2018-08-16 | 2020-10-09 | 江苏优珀斯材料科技有限公司 | High-barrier strong cross-membrane |
| CN112208114A (en) * | 2020-09-14 | 2021-01-12 | 与时高分子科技(湖北)有限公司 | Preparation method of high-density polyethylene cross membrane |
| CN114083856B (en) * | 2021-12-07 | 2023-08-11 | 江门市华龙膜材股份有限公司 | High-temperature-resistant self-adhesive pure polyethylene protective film and preparation method thereof |
| CN116278272A (en) * | 2023-01-17 | 2023-06-23 | 合肥万力轮胎有限公司 | Isolation film for tire production and preparation method thereof |
| CN116423867B (en) * | 2023-04-17 | 2026-04-14 | 山东宏图新材料科技股份有限公司 | Composite crossed membrane resistant to ejector rod tearing and preparation method thereof |
| CN118893883A (en) * | 2024-07-14 | 2024-11-05 | 吉林三鑫工贸有限责任公司 | A high-strength puncture-resistant polyethylene bubble bag and preparation method thereof |
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| CN102225646A (en) * | 2011-05-12 | 2011-10-26 | 福州绿帆包装材料有限公司 | Multilayer coextrusion medical blister composite packaging film and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1829600A (en) * | 2004-05-27 | 2006-09-06 | 派驰玛斯金属塑料及纤维工业公司 | Bi-layered container for hazardous substances and process for producing the same |
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|---|---|---|---|---|
| CN1978184A (en) * | 2005-12-01 | 2007-06-13 | 丹阳市万乐复合材料厂 | Method for producing blowing-film for bags |
| CN101117034A (en) * | 2007-09-19 | 2008-02-06 | 甘国工 | One-way stretching film compounded multiaspect drag-resisting avulsion-resisting film and method for producing the same |
| CN102225646A (en) * | 2011-05-12 | 2011-10-26 | 福州绿帆包装材料有限公司 | Multilayer coextrusion medical blister composite packaging film and preparation method thereof |
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