CN103481621B - A kind of low-temperature polyethylene shrink film and film-blowing process thereof - Google Patents
A kind of low-temperature polyethylene shrink film and film-blowing process thereof Download PDFInfo
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Abstract
The present invention relates to shrink film technical field, particularly relate to a kind of low-temperature polyethylene shrink film and film-blowing process, high melting means blown film level polyethylene, the coating level polyethylene of 5% ~ 25%, the metallocene PE of 20% ~ 30% that the skin of described low-temperature polyethylene shrink film is 50% ~ 70% by percentage by weight form; High melting means blown film level polyethylene, the coating level polyethylene of 20% ~ 30%, the metallocene PE of 20% ~ 50% that described intermediate layer is 30% ~ 50% by percentage by weight form; High melting means blown film level polyethylene, the coating level polyethylene of 5% ~ 25%, the metallocene PE of 20% ~ 30% that described internal layer is 50% ~ 70% by percentage by weight form.The low-temperature polyethylene shrink film shrinkage temperature adopting raw material of the present invention to prepare can reduce by 5 ~ 15 DEG C, reduces energy consumption, improves speed of production, reduces production cost; Film-blowing process conditional stability, temperature controls accurately, and production efficiency is high.
Description
Technical field
The present invention relates to shrink film technical field, particularly relate to low-temperature polyethylene shrink film and film-blowing process thereof.
Background technology
Shrink film is mainly used in sale and the transport of various product, and its Main Function is firmly, hides and protection product, so shrink film must have higher paracentesis resistance, good shrinkage and shrinkage stress.Initial shrink film is based on PVC, and along with improving constantly shrink film performance requirement, PVC shrink film reduces gradually, and the development of various polyethylene shrink film rapidly.Polyethylene shrink film is the good material of a kind of toughness, be widely used in the one integral piece assembly package of the products such as drinks, pop can class, mineral water class, various beverage class, cloth, this product pliability is good, and impact resistance, tear resistance are strong, not cracky, be not afraid of tide, shrinkage factor is large.
The shrinkage temperature of the polyethylene shrink film that prior art is produced is general higher, energy consumption is large, the performance of product, thickness, insufficient strength are stablized, along with the development of technology, each enterprise makes every effort on the basis meeting the good physics of hot polyethylene shrink film, mechanical performance, reduces the production cost of polyethylene shrink film further.
Therefore, a kind of polyethylene shrink film reducing production cost of proposition is needed badly.
Summary of the invention
Object of the present invention is exactly provide a kind of low-temperature polyethylene shrink film reducing production cost for the deficiencies in the prior art.
Another object of the present invention is just to provide a kind of film-blowing process of low-temperature polyethylene shrink film.
To achieve these goals, the present invention by the following technical solutions.
A kind of low-temperature polyethylene shrink film, described low-temperature polyethylene shrink film is made up of the film of three-layer co-extruded bonding, i.e. skin, intermediate layer and internal layer;
High melting means blown film level polyethylene, the coating level polyethylene of 5% ~ 25%, the metallocene PE of 20% ~ 30% that described skin is 50% ~ 70% by percentage by weight form;
High melting means blown film level polyethylene, the coating level polyethylene of 20% ~ 30%, the metallocene PE of 20% ~ 50% that described intermediate layer is 30% ~ 50% by percentage by weight form;
High melting means blown film level polyethylene, the coating level polyethylene of 5% ~ 25%, the metallocene PE of 20% ~ 30% that described internal layer is 50% ~ 70% by percentage by weight form;
Poly melt index>=the 4g/10min of described high melting means blown film level, density≤0.925g/cm
3; Preferably, high melting means blown film level polyethylene selects model for raising sub-BASF 2420K, any one or the poly mixture of multiple high melting means blown film level in the 2426K of CNOOC and Shell Petrochemicals Co., Ltd, Tao Shi 5005.
Poly melt index>=the 7g/10min of described coating level, density are 0.910g/cm
3~ 0.930g/cm
3.Preferably, coating level polyethylene is Qatar petrochemical industry MG70, LG chemistry LB7000,9500, any one or the poly mixture of multiple coating level in Mitsui Chemicals 403,105.Coating level polyethylene has the features such as softening temperature is low, good toughness, bonding force are strong, film forming is even, heat sealability is good, waterproofing agent is moistureproof.
Described metallocene PE refers to melt index>=1g/10min, density≤0.930 g/cm
3metallocene linear-low density polyethylene.Preferably, metallocene PE is Dao Daer 2710, the mixture of a kind of or two kinds of metallocene PEs in the 2018HA of exxon chemical.
Wherein, described outer field thickness: the thickness in intermediate layer: the ratio of the thickness of internal layer is 1:2:1 ~ 1:4:1.
Wherein, described skin is 60% ~ 70% by percentage by weight high melting means blown film level polyethylene, the coating level polyethylene of 5% ~ 10%, the metallocene PE of 25% ~ 30% form; The raw material composition of described internal layer forms identical with outer field raw material.
Wherein, described skin is 50% ~ 60% by percentage by weight high melting means blown film level polyethylene, the coating level polyethylene of 10% ~ 20%, the metallocene PE of 25% ~ 30% form; The raw material composition of described internal layer forms identical with outer field raw material.
Wherein, described skin is 55% ~ 65% by percentage by weight high melting means blown film level polyethylene, the coating level polyethylene of 8% ~ 17%, the metallocene PE of 22% ~ 28% form; The raw material composition of described internal layer forms identical with outer field raw material.
Wherein, described intermediate layer is 40% ~ 50% by percentage by weight high melting means blown film level polyethylene, the coating level polyethylene of 25% ~ 30%, the metallocene PE of 20% ~ 35% form.
Wherein, described intermediate layer is 30% ~ 40% by percentage by weight high melting means blown film level polyethylene, the coating level polyethylene of 20% ~ 25%, the metallocene PE of 35% ~ 50% form.
Wherein, described intermediate layer is 33% ~ 45% by percentage by weight high melting means blown film level polyethylene, the coating level polyethylene of 22% ~ 28%, the metallocene PE of 27% ~ 45% form.
A film-blowing process for low-temperature polyethylene shrink film, comprises following processing step:
Extrude: the raw material of skin, intermediate layer, internal layer is mixed respectively by weight percentage, be then sent to the extruder of three-layer co-extruded blown film unit respectively; Described three-layer co-extruded blown film unit is made up of single screw extrusion machine, and the diameter of described singe screw is 90mm ~ 130mm, and rotating speed is 40 ~ 45r/min.Because coating level polyethylene melt intensity is poor, may cause shrink film difficult forming, film bubble instability causes blown film difficulty, and thickness evenness is poor, therefore the present invention adopts large screw rod, slow-speed of revolution technology, adopt this technology, make shrink film plastify completely, ensure to shrink film strength, make shearing force less simultaneously, shear evenly, shear heat less, the object of precise control of temperature can be reached.
(b) blown film: obtain low-temperature polyethylene shrink film by the extruder inflation of three-layer co-extruded blown film unit; The extrusion temperature of the screw rod of extruder is 130 DEG C ~ 140 DEG C; The blow-up ratio of described blown film is 2 ~ 3;
C () cools; Temperature≤19 DEG C of the cold wind of described cooling.The present invention adopts Reifenhauser Ultra Cool cooling technology, temperature≤19 DEG C of the cooling air of use, and inside and outside cooling is even, good cooling results.
Wherein, described low-temperature polyethylene shrink film Vicat softening point≤90 DEG C; This Vicat softening point is beneficial to low-temperature shrink, make the low-temperature polyethylene shrink film flexibility of preparation, bright property high, can be used for flexibility and the higher Tetra Pak of bright property requirement, fruit grain paper bag packaging, to needing to be packed by shrink film and the product very low to package temperature requirement has good adaptability.
Beneficial effect of the present invention: a kind of low-temperature polyethylene shrink film of the present invention is made up of the film of three-layer co-extruded bonding, i.e. skin, intermediate layer and internal layer; High melting means blown film level polyethylene, the coating level polyethylene of 5% ~ 25%, the metallocene PE of 20% ~ 30% that described skin is 50% ~ 70% by percentage by weight form; High melting means blown film level polyethylene, the coating level polyethylene of 20% ~ 30%, the metallocene PE of 20% ~ 50% that described intermediate layer is 30% ~ 50% by percentage by weight form; High melting means blown film level polyethylene, the coating level polyethylene of 5% ~ 25%, the metallocene PE of 20% ~ 30% that described internal layer is 50% ~ 70% by percentage by weight form; Poly melt index>=the 4g/10min of described high melting means blown film level, density≤0.925g/cm
3; Poly melt index>=the 7g/10min of described coating level, density are 0.910g/cm
3~ 0.930g/cm
3; Described metallocene PE refers to melt index>=1g/10min, density≤0.930g/cm
3metallocene linear-low density polyethylene.The low-temperature polyethylene shrink film shrinkage temperature adopting raw material of the present invention to prepare can reduce by 10 ~ 20 DEG C, reduces energy consumption, and can be used for the product very low to package temperature requirement.
The film-blowing process of a kind of low-temperature polyethylene shrink film of the present invention, film-blowing process conditional stability, temperature controls accurately, and production efficiency is high.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further detailed explanation.
embodiment 1.
A kind of low-temperature polyethylene shrink film, described low-temperature polyethylene shrink film is made up of the film of three-layer co-extruded bonding, i.e. skin, intermediate layer and internal layer;
High melting means blown film level polyethylene, the coating level polyethylene of 25%, the metallocene PE of 25% that described skin is 50% by percentage by weight form;
High melting means blown film level polyethylene, the coating level polyethylene of 30%, the metallocene PE of 20% that described intermediate layer is 50% by percentage by weight form;
Poly melt index>=the 4g/10min of described high melting means blown film level, density≤0.925g/cm
3, the present embodiment selects model to be raise the high melting means blown film level polyethylene of sub-BASF 2420K; Poly melt index>=the 7g/10min of described coating level, density are 0.910g/cm
3~ 0.930g/cm
3, the present embodiment selects model to be the coating level polyethylene of Qatar petrochemical industry MG70; Described metallocene PE refers to melt index>=1g/10min, density≤0.930 g/cm
3metallocene linear-low density polyethylene, the present embodiment selects model to be the metallocene linear-low density polyethylene of Dao Daer 2710.
The raw material composition of described internal layer forms identical with outer field raw material;
Wherein, described outer field thickness: the thickness in intermediate layer: the ratio of the thickness of internal layer is 1:4:1.
A film-blowing process for low-temperature polyethylene shrink film, comprises following processing step:
A () extrudes: mixed by weight percentage respectively by the raw material of skin, intermediate layer, internal layer, is then sent to the extruder of three-layer co-extruded blown film unit respectively; Described three-layer co-extruded blown film unit is made up of single screw extrusion machine, and the diameter of described singe screw is 90mm, and rotating speed is 40r/min;
(b) blown film: obtain low-temperature polyethylene shrink film by the extruder inflation of three-layer co-extruded blown film unit; The extrusion temperature of the screw rod of extruder is 130 DEG C;
C () cools, the temperature of the cold wind of described cooling is 19 DEG C.
The low-temperature polyethylene shrink film Vicat softening point that the present embodiment obtains is 85 DEG C.
embodiment 2.
A kind of low-temperature polyethylene shrink film, described low-temperature polyethylene shrink film is made up of the film of three-layer co-extruded bonding, i.e. skin, intermediate layer and internal layer;
High melting means blown film level polyethylene, the coating level polyethylene of 5%, the metallocene PE of 25% that described skin is 70% by percentage by weight form;
High melting means blown film level polyethylene, the coating level polyethylene of 27%, the metallocene PE of 30% that described intermediate layer is 43% by percentage by weight form;
Poly melt index>=the 4g/10min of described high melting means blown film level, density≤0.925g/cm
3, the present embodiment selects model to be the high melting means blown film level polyethylene of the 2426K of CNOOC and Shell Petrochemicals Co., Ltd; Poly melt index>=the 7g/10min of described coating level, density are 0.910g/cm
3~ 0.930g/cm
3, the present embodiment selects model to be the coating level polyethylene of Mitsui Chemicals 403; Described metallocene PE refers to melt index>=1g/10min, density≤0.930 g/cm
3metallocene linear-low density polyethylene, the present embodiment selects model to be the metallocene linear-low density polyethylene of the 2018HA of exxon chemical.
The raw material composition of described internal layer forms identical with outer field raw material;
Wherein, described outer field thickness: the thickness in intermediate layer: the ratio of the thickness of internal layer is 1:2:1.
A film-blowing process for low-temperature polyethylene shrink film, comprises following processing step:
A () extrudes: mixed by weight percentage respectively by the raw material of skin, intermediate layer, internal layer, is then sent to the extruder of three-layer co-extruded blown film unit respectively; Described three-layer co-extruded blown film unit is made up of single screw extrusion machine, and the diameter of described singe screw is 100mm, and rotating speed is 43r/min;
(b) blown film: obtain low-temperature polyethylene shrink film by the extruder inflation of three-layer co-extruded blown film unit; The extrusion temperature of the screw rod of extruder is 132 DEG C;
C () cools, the temperature of the cold wind of described cooling is 18 DEG C.
The low-temperature polyethylene shrink film Vicat softening point that the present embodiment obtains is 90 DEG C.
embodiment 3.
A kind of low-temperature polyethylene shrink film, described low-temperature polyethylene shrink film is made up of the film of three-layer co-extruded bonding, i.e. skin, intermediate layer and internal layer;
High melting means blown film level polyethylene, the coating level polyethylene of 10%, the metallocene PE of 30% that described skin is 60% by percentage by weight form;
High melting means blown film level polyethylene, the coating level polyethylene of 25%, the metallocene PE of 35% that described intermediate layer is 40% by percentage by weight form;
The raw material composition of described internal layer forms identical with outer field raw material;
Poly melt index>=the 4g/10min of described high melting means blown film level, density≤0.925g/cm
3, the present embodiment selects model to be the high melting means blown film level polyethylene of Tao Shi 5005; Poly melt index>=the 7g/10min of described coating level, density are 0.910g/cm
3~ 0.930g/cm
3, the present embodiment selects model to be the coating level polyethylene of Mitsui Chemicals 403; Described metallocene PE refers to melt index>=1g/10min, density≤0.930 g/cm
3metallocene linear-low density polyethylene, the present embodiment selects model to be the metallocene linear-low density polyethylene of the 2018HA of exxon chemical.
Wherein, described outer field thickness: the thickness in intermediate layer: the ratio of the thickness of internal layer is 1:3:1.
A film-blowing process for low-temperature polyethylene shrink film, comprises following processing step:
A () extrudes: mixed by weight percentage respectively by the raw material of skin, intermediate layer, internal layer, is then sent to the extruder of three-layer co-extruded blown film unit respectively; Described three-layer co-extruded blown film unit is made up of single screw extrusion machine, and the diameter of described singe screw is 110mm, and rotating speed is 45r/min;
(b) blown film: obtain low-temperature polyethylene shrink film by the extruder inflation of three-layer co-extruded blown film unit; The extrusion temperature of the screw rod of extruder is 134 DEG C;
C () cools, the temperature of the cold wind of described cooling is 17 DEG C.
The low-temperature polyethylene shrink film Vicat softening point that the present embodiment obtains is 86 DEG C.
embodiment 4.
A kind of low-temperature polyethylene shrink film, described low-temperature polyethylene shrink film is made up of the film of three-layer co-extruded bonding, i.e. skin, intermediate layer and internal layer;
High melting means blown film level polyethylene, the coating level polyethylene of 13%, the metallocene PE of 22% that described skin is 65% by percentage by weight form;
High melting means blown film level polyethylene, the coating level polyethylene of 22%, the metallocene PE of 45% that described intermediate layer is 33% by percentage by weight form;
The raw material composition of described internal layer forms identical with outer field raw material;
Poly melt index>=the 4g/10min of described high melting means blown film level, density≤0.925g/cm
3, the present embodiment selects model to be raise sub-BASF 2420K, Tao Shi 5005 high melting means blown film level polyethylene of arbitrary proportion mixing; Poly melt index>=the 7g/10min of described coating level, density are 0.910g/cm
3~ 0.930g/cm
3, the present embodiment selects the coating level polyethylene that model is LG chemistry LB9500, Mitsui Chemicals 105 arbitrary proportion mixes; Described metallocene PE refers to melt index>=1g/10min, density≤0.930 g/cm
3metallocene linear-low density polyethylene, the present embodiment select model be Dao Daer 2710, exxon chemical 2018HA arbitrary proportion mixing metallocene linear-low density polyethylene.
Wherein, described outer field thickness: the thickness in intermediate layer: the ratio of the thickness of internal layer is 1:4:1.
A film-blowing process for low-temperature polyethylene shrink film, comprises following processing step:
A () extrudes: mixed by weight percentage respectively by the raw material of skin, intermediate layer, internal layer, is then sent to the extruder of three-layer co-extruded blown film unit respectively; Described three-layer co-extruded blown film unit is made up of single screw extrusion machine, and the diameter of described singe screw is 120mm, and rotating speed is 40r/min;
(b) blown film: obtain low-temperature polyethylene shrink film by the extruder inflation of three-layer co-extruded blown film unit; The extrusion temperature of the screw rod of extruder is 137 DEG C;
C () cools, the temperature of the cold wind of described cooling is 18 DEG C.
The low-temperature polyethylene shrink film Vicat softening point that the present embodiment obtains is 87 DEG C.
embodiment 5.
A kind of low-temperature polyethylene shrink film, described low-temperature polyethylene shrink film is made up of the film of three-layer co-extruded bonding, i.e. skin, intermediate layer and internal layer;
High melting means blown film level polyethylene, the coating level polyethylene of 18%, the metallocene PE of 27% that described skin is 55% by percentage by weight form;
High melting means blown film level polyethylene, the coating level polyethylene of 20%, the metallocene PE of 33% that described intermediate layer is 47% by percentage by weight form;
The raw material composition of described internal layer forms identical with outer field raw material;
Poly melt index>=the 4g/10min of described high melting means blown film level, density≤0.925g/cm
3, the present embodiment select model be raise sub-BASF 2420K, CNOOC and Shell Petrochemicals Co., Ltd 2426K, Tao Shi 5005 arbitrary proportion mixing high melting means blown film level polyethylene; Poly melt index>=the 7g/10min of described coating level, density are 0.910g/cm
3~ 0.930g/cm
3, the present embodiment selects the coating level polyethylene that model is Qatar petrochemical industry MG70, LG chemistry LB7000, Mitsui Chemicals 403 arbitrary proportion mixes; Described metallocene PE refers to melt index>=1g/10min, density≤0.930 g/cm
3metallocene linear-low density polyethylene, the present embodiment selects model to be the metallocene linear-low density polyethylene of Dao Daer 2710.
Wherein, described outer field thickness: the thickness in intermediate layer: the ratio of the thickness of internal layer is 1:4:1.
A film-blowing process for low-temperature polyethylene shrink film, comprises following processing step:
A () extrudes: mixed by weight percentage respectively by the raw material of skin, intermediate layer, internal layer, is then sent to the extruder of three-layer co-extruded blown film unit respectively; Described three-layer co-extruded blown film unit is made up of single screw extrusion machine, and the diameter of described singe screw is 130mm, and rotating speed is 42r/min;
(b) blown film: obtain low-temperature polyethylene shrink film by the extruder inflation of three-layer co-extruded blown film unit; The extrusion temperature of the screw rod of extruder is 140 DEG C;
C () cools, the temperature of the cold wind of described cooling is 19 DEG C.
The low-temperature polyethylene shrink film Vicat softening point that the present embodiment obtains is 87 DEG C.
The physical property of low-temperature polyethylene shrink film prepared by embodiments of the invention 1 ~ embodiment 5 is as follows:
Can be found out by the contrast of table 1: low-temperature polyethylene shrink film prepared by the present invention keep tearing strength, fracture tensile strength, elongation at break, percent thermal shrinkage basis on, glossiness and mist degree are obviously better than ordinary hot shrink film; Vicat softening point, DSC are lower than ordinary hot shrink film, low-temperature polyethylene shrink film flexibility, the bright property of preparation are high, can be used for flexibility and the higher Tetra Pak of bright property requirement, fruit grain paper bag packaging, to needing to be packed by shrink film and the product very low to package temperature requirement has good adaptability.
Finally should be noted that; above embodiment is only for illustration of technical scheme of the present invention but not limiting the scope of the invention; although be explained in detail the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technical scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.
Claims (8)
1. a low-temperature polyethylene shrink film, described low-temperature polyethylene shrink film is made up of the film of three-layer co-extruded bonding, i.e. skin, intermediate layer and internal layer; It is characterized in that:
High melting means blown film level polyethylene, the coating level polyethylene of 5% ~ 25%, the metallocene PE of 20% ~ 30% that described skin is 50% ~ 70% by percentage by weight form;
High melting means blown film level polyethylene, the coating level polyethylene of 20% ~ 30%, the metallocene PE of 20% ~ 50% that described intermediate layer is 30% ~ 50% by percentage by weight form;
High melting means blown film level polyethylene, the coating level polyethylene of 5% ~ 25%, the metallocene PE of 20% ~ 30% that described internal layer is 50% ~ 70% by percentage by weight form;
Described high melting means blown film level polyethylene is melt index>=4g/10min, density≤0.925g/cm
3low density polyethylene (LDPE);
Described coating level polyethylene is melt index>=7g/10min, density is 0.910g/cm
3~ 0.930g/cm
3low density polyethylene (LDPE);
Described metallocene PE refers to melt index>=1g/10min, density≤0.930 g/cm
3metallocene linear-low density polyethylene; Described outer field thickness: the thickness in intermediate layer: the ratio of the thickness of internal layer is 1:2:1 or 1:4:1;
The film-blowing process of described low-temperature polyethylene shrink film, comprises following processing step:
A () extrudes: mixed by weight percentage respectively by the raw material of skin, intermediate layer, internal layer, is then sent to the extruder of three-layer co-extruded blown film unit respectively; Described three-layer co-extruded blown film unit is made up of single screw extrusion machine, and the diameter of singe screw is 90mm ~ 130mm, and rotating speed is 40 ~ 45r/min;
(b) blown film: obtain low-temperature polyethylene shrink film by the extruder inflation of three-layer co-extruded blown film unit; The extrusion temperature of the screw rod of extruder is 130 DEG C ~ 140 DEG C; The blow-up ratio of described blown film is 2 ~ 3;
C () cools: temperature≤19 DEG C of the cold wind of cooling.
2. a kind of low-temperature polyethylene shrink film according to claim 1, is characterized in that: high melting means blown film level polyethylene, the coating level polyethylene of 5% ~ 10%, the metallocene PE of 25% ~ 30% that described skin is 60% ~ 70% by percentage by weight form; The raw material composition of described internal layer forms identical with outer field raw material.
3. a kind of low-temperature polyethylene shrink film according to claim 1, is characterized in that: high melting means blown film level polyethylene, the coating level polyethylene of 10% ~ 20%, the metallocene PE of 25% ~ 30% that described skin is 50% ~ 60% by percentage by weight form; The raw material composition of described internal layer forms identical with outer field raw material.
4. a kind of low-temperature polyethylene shrink film according to claim 1, is characterized in that: high melting means blown film level polyethylene, the coating level polyethylene of 8% ~ 17%, the metallocene PE of 22% ~ 28% that described skin is 55% ~ 65% by percentage by weight form; The raw material composition of described internal layer forms identical with outer field raw material.
5. a kind of low-temperature polyethylene shrink film according to claim 1, is characterized in that: high melting means blown film level polyethylene, the coating level polyethylene of 25% ~ 30%, the metallocene PE of 20% ~ 35% that described intermediate layer is 40% ~ 50% by percentage by weight form.
6. a kind of low-temperature polyethylene shrink film according to claim 1, is characterized in that: high melting means blown film level polyethylene, the coating level polyethylene of 20% ~ 25%, the metallocene PE of 35% ~ 50% that described intermediate layer is 30% ~ 40% by percentage by weight form.
7. a kind of low-temperature polyethylene shrink film according to claim 1, is characterized in that: high melting means blown film level polyethylene, the coating level polyethylene of 22% ~ 28%, the metallocene PE of 27% ~ 45% that described intermediate layer is 33% ~ 45% by percentage by weight form.
8. a kind of low-temperature polyethylene shrink film according to claim 1, is characterized in that: described low-temperature polyethylene shrink film Vicat softening point≤90 DEG C.
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| CN103879112B (en) * | 2014-02-26 | 2016-02-10 | 成都市兴恒泰印务有限公司 | Plastic compound flexible packaging polyethylene film and blow moiding method thereof |
| CN104175676B (en) * | 2014-08-29 | 2016-06-08 | 东莞市正新包装制品有限公司 | A kind of high bright polyethylene shrink film and film-blowing process thereof |
| CN105058938A (en) * | 2015-06-05 | 2015-11-18 | 无锡市方成彩印包装有限公司 | Thermal shrinkage packaging film and production method thereof |
| CN105015120A (en) * | 2015-08-19 | 2015-11-04 | 浙江金石包装有限公司 | High-transparency polyethylene film and preparation method thereof |
| CN109466146A (en) * | 2018-12-28 | 2019-03-15 | 大连盛林薄膜新材料有限公司 | It is a kind of easily to thrust type curtain coating polyethylene film |
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