CN103481621A - Low-temperature polyethylene shrink film and film blowing technique thereof - Google Patents
Low-temperature polyethylene shrink film and film blowing technique thereof Download PDFInfo
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Abstract
The invention relates to the technical field of shrink films, particularly a low-temperature polyethylene shrink film and a film blowing technique thereof. The outer layer of the low-temperature polyethylene shrink film is composed of the following components in percentage by weight: 50-70% of high-melt-index blown-film-level polyethylene, 5-25% of coating-level polyethylene and 20-30% of metallocene polyethylene. The middle layer is composed of the following components in percentage by weight: 30-50% of high-melt-index blown-film-level polyethylene, 20-30% of coating-level polyethylene and 20-50% of metallocene polyethylene. The inner layer is composed of the following components in percentage by weight: 50-70% of high-melt-index blown-film-level polyethylene, 5-25% of coating-level polyethylene and 20-30% of metallocene polyethylene. The shrinkage temperature of the low-temperature polyethylene shrink film can be lowered by 5-15 DEG C; and the film blowing technique reduces the energy consumption, enhances the production rate, lowers the production cost, and has the advantages of stable technological conditions, accurate temperature control and high production efficiency.
Description
Technical field
The present invention relates to the shrink film technical field, relate in particular to low-temperature polyethylene shrink film and film-blowing process thereof.
Background technology
Shrink film is mainly used in sale and the transportation of various products, its Main Function be firm, hide and the protection product, so shrink film must have higher paracentesis resistance, good shrinkage and shrinkage stress.Initial shrink film be take PVC as main, and along with to the improving constantly of shrink film performance requirement, the 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 whole 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 generally higher, energy consumption is large, the performance of product, thickness, insufficient strength are stablized, development along with technology, each enterprise makes every effort to, on the basis that meets physics that hot polymerization ethene shrink film is good, mechanical performance, further reduce the production cost of polyethylene shrink film.
Therefore, need badly and propose a kind of polyethylene shrink film reduced production costs.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of low-temperature polyethylene shrink film reduced production costs for the deficiencies in the prior art.
Another object of the present invention just is 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 consists of the film of three-layer co-extruded bonding, i.e. skin, intermediate layer and internal layer;
The height that described skin is 50% ~ 70% by percentage by weight is molten refers to that blown film level polyethylene, 5% ~ 25% coating level polyethylene, 20% ~ 30% metallocene PE form;
The height that described intermediate layer is 30% ~ 50% by percentage by weight is molten refers to that blown film level polyethylene, 20% ~ 30% coating level polyethylene, 20% ~ 50% metallocene PE form;
The height that described internal layer is 50% ~ 70% by percentage by weight is molten refers to that blown film level polyethylene, 5% ~ 25% coating level polyethylene, 20% ~ 30% metallocene PE form;
The molten poly melt index>=4g/10min of blown film level, the density≤0.925g/cm of referring to of described height
3; Preferably, high molten finger blown film level polyethylene selects model for raising sub-BASF 2420K, the 2426K of CNOOC and Shell Petrochemicals Co., Ltd, the molten poly mixture of blown film level that refers to of any one in Tao Shi 5005 or multiple height.
Poly melt index>=the 7g/10min of described coating level, density are 0.910g/cm
3~ 0.930g/cm
3.Preferably, applying the level polyethylene is Qatar petrochemical industry MG70, LG chemistry LB7000,9500, any one in Mitsui Chemicals 403,105 or the poly mixture of multiple coating level.Apply the level polyethylene and there are the characteristics such as softening temperature is low, good toughness, bonding force is 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, the height that described skin is 60% ~ 70% by percentage by weight is molten refers to that blown film level polyethylene, 5% ~ 10% coating level polyethylene, 25% ~ 30% metallocene PE form; It is identical with outer field raw material composition that the raw material of described internal layer forms.
Wherein, the height that described skin is 50% ~ 60% by percentage by weight is molten refers to that blown film level polyethylene, 10% ~ 20% coating level polyethylene, 25% ~ 30% metallocene PE form; It is identical with outer field raw material composition that the raw material of described internal layer forms.
Wherein, the height that described skin is 55% ~ 65% by percentage by weight is molten refers to that blown film level polyethylene, 8% ~ 17% coating level polyethylene, 22% ~ 28% metallocene PE form; It is identical with outer field raw material composition that the raw material of described internal layer forms.
Wherein, the height that described intermediate layer is 40% ~ 50% by percentage by weight is molten refers to that blown film level polyethylene, 25% ~ 30% coating level polyethylene, 20% ~ 35% metallocene PE form.
Wherein, the height that described intermediate layer is 30% ~ 40% by percentage by weight is molten refers to that blown film level polyethylene, 20% ~ 25% coating level polyethylene, 35% ~ 50% metallocene PE form.
Wherein, the height that described intermediate layer is 33% ~ 45% by percentage by weight is molten refers to that blown film level polyethylene, 22% ~ 28% coating level polyethylene, 27% ~ 45% metallocene PE form.
A kind of film-blowing process of 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, then be sent to respectively the extruder of three-layer co-extruded blown film unit; Described three-layer co-extruded blown film unit is comprised of single screw extrusion machine, and the diameter of described single screw rod is 90mm ~ 130mm, and rotating speed is 40 ~ 45r/min.Owing to applying, level polyethylene melt intensity is poor, may cause the shrink film difficult forming, the unstable blown film difficulty that causes of film bubble, thickness evenness is poor, therefore the present invention adopts large screw rod, slow-speed of revolution technology, adopt this technology, make the shrink film plasticizing fully, guarantee to shrink film strength, make shearing force less simultaneously, shear evenly, shear heat less, can reach the purpose of accurate control temperature.
(b) blown film: the extruder inflation by three-layer co-extruded blown film unit makes the low-temperature polyethylene shrink film; The extrusion temperature of the screw rod of extruder is 130 ℃ ~ 140 ℃; The blow-up ratio of described blown film is 2 ~ 3;
(c) cooling; The temperature of described cooling cold wind≤19 ℃.The present invention adopts Reifenhauser Ultra Cool cooling technology, and the temperature of the cooling air of use≤19 ℃ are inside and outside cooling even, good cooling results.
Wherein, described low-temperature polyethylene shrink film Vicat softening point≤90 ℃; This Vicat softening point is beneficial to low-temperature shrink, make low-temperature polyethylene shrink film flexibility, the bright property of preparation high, can be used for the Tetra Pak that flexibility and bright property are had relatively high expectations, fruit grain paper bag packing, to packing and require very low product that good adaptability is arranged to package temperature by shrink film.
Beneficial effect of the present invention: a kind of low-temperature polyethylene shrink film of the present invention consists of the film of three-layer co-extruded bonding, i.e. skin, intermediate layer and internal layer; The height that described skin is 50% ~ 70% by percentage by weight is molten refers to that blown film level polyethylene, 5% ~ 25% coating level polyethylene, 20% ~ 30% metallocene PE form; The height that described intermediate layer is 30% ~ 50% by percentage by weight is molten refers to that blown film level polyethylene, 20% ~ 30% coating level polyethylene, 20% ~ 50% metallocene PE form; The height that described internal layer is 50% ~ 70% by percentage by weight is molten refers to that blown film level polyethylene, 5% ~ 25% coating level polyethylene, 20% ~ 30% metallocene PE form; The molten poly melt index>=4g/10min of blown film level, the density≤0.925g/cm of referring to of described height
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 that adopts raw material of the present invention to prepare can reduce by 10 ~ 20 ℃, reduces energy consumption, and can be for package temperature is required to very low product.
The film-blowing process of a kind of low-temperature polyethylene shrink film of the present invention, film-blowing process conditional stability, temperature is controlled accurately, and production efficiency is high.
The specific embodiment
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 consists of the film of three-layer co-extruded bonding, i.e. skin, intermediate layer and internal layer;
The height that described skin is 50% by percentage by weight is molten refers to that blown film level polyethylene, 25% coating level polyethylene, 25% metallocene PE form;
The height that described intermediate layer is 50% by percentage by weight is molten refers to that blown film level polyethylene, 30% coating level polyethylene, 20% metallocene PE form;
The molten poly melt index>=4g/10min of blown film level, the density≤0.925g/cm of referring to of described height
3, it is to raise the molten blown film level polyethylene that refers to of height of sub-BASF 2420K that the present embodiment is selected model; Poly melt index>=the 7g/10min of described coating level, density are 0.910g/cm
3~ 0.930g/cm
3, the present embodiment is selected the coating level polyethylene that model is 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 is selected the metallocene linear-low density polyethylene that model is Dao Daer 2710.
It is identical with outer field raw material composition that the raw material of described internal layer forms;
Wherein, described outer field thickness: the thickness in intermediate layer: the ratio of the thickness of internal layer is 1:4:1.
A kind of film-blowing process of low-temperature polyethylene shrink film comprises following processing step:
(a) extrude: the raw material of skin, intermediate layer, internal layer is mixed respectively by weight percentage, then be sent to respectively the extruder of three-layer co-extruded blown film unit; Described three-layer co-extruded blown film unit is comprised of single screw extrusion machine, and the diameter of described single screw rod is 90mm, and rotating speed is 40r/min;
(b) blown film: the extruder inflation by three-layer co-extruded blown film unit makes the low-temperature polyethylene shrink film; The extrusion temperature of the screw rod of extruder is 130 ℃;
(c) cooling, the temperature of described cooling cold wind is 19 ℃.
The low-temperature polyethylene shrink film Vicat softening point that the present embodiment makes is 85 ℃.
embodiment 2.
A kind of low-temperature polyethylene shrink film, described low-temperature polyethylene shrink film consists of the film of three-layer co-extruded bonding, i.e. skin, intermediate layer and internal layer;
The height that described skin is 70% by percentage by weight is molten refers to that blown film level polyethylene, 5% coating level polyethylene, 25% metallocene PE form;
The height that described intermediate layer is 43% by percentage by weight is molten refers to that blown film level polyethylene, 27% coating level polyethylene, 30% metallocene PE form;
The molten poly melt index>=4g/10min of blown film level, the density≤0.925g/cm of referring to of described height
3, the present embodiment is selected the molten blown film level polyethylene that refers to of the height of the 2426K that model is 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 is selected the coating level polyethylene that model is 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 is selected the metallocene linear-low density polyethylene of the 2018HA that model is exxon chemical.
It is identical with outer field raw material composition that the raw material of described internal layer forms;
Wherein, described outer field thickness: the thickness in intermediate layer: the ratio of the thickness of internal layer is 1:2:1.
A kind of film-blowing process of low-temperature polyethylene shrink film comprises following processing step:
(a) extrude: the raw material of skin, intermediate layer, internal layer is mixed respectively by weight percentage, then be sent to respectively the extruder of three-layer co-extruded blown film unit; Described three-layer co-extruded blown film unit is comprised of single screw extrusion machine, and the diameter of described single screw rod is 100mm, and rotating speed is 43r/min;
(b) blown film: the extruder inflation by three-layer co-extruded blown film unit makes the low-temperature polyethylene shrink film; The extrusion temperature of the screw rod of extruder is 132 ℃;
(c) cooling, the temperature of described cooling cold wind is 18 ℃.
The low-temperature polyethylene shrink film Vicat softening point that the present embodiment makes is 90 ℃.
embodiment 3.
A kind of low-temperature polyethylene shrink film, described low-temperature polyethylene shrink film consists of the film of three-layer co-extruded bonding, i.e. skin, intermediate layer and internal layer;
The height that described skin is 60% by percentage by weight is molten refers to that blown film level polyethylene, 10% coating level polyethylene, 30% metallocene PE form;
The height that described intermediate layer is 40% by percentage by weight is molten refers to that blown film level polyethylene, 25% coating level polyethylene, 35% metallocene PE form;
It is identical with outer field raw material composition that the raw material of described internal layer forms;
The molten poly melt index>=4g/10min of blown film level, the density≤0.925g/cm of referring to of described height
3, the present embodiment is selected the molten blown film level polyethylene that refers to of height that model is 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 is selected the coating level polyethylene that model is 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 is selected the metallocene linear-low density polyethylene of the 2018HA that model is 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 kind of film-blowing process of low-temperature polyethylene shrink film comprises following processing step:
(a) extrude: the raw material of skin, intermediate layer, internal layer is mixed respectively by weight percentage, then be sent to respectively the extruder of three-layer co-extruded blown film unit; Described three-layer co-extruded blown film unit is comprised of single screw extrusion machine, and the diameter of described single screw rod is 110mm, and rotating speed is 45r/min;
(b) blown film: the extruder inflation by three-layer co-extruded blown film unit makes the low-temperature polyethylene shrink film; The extrusion temperature of the screw rod of extruder is 134 ℃;
(c) cooling, the temperature of described cooling cold wind is 17 ℃.
The low-temperature polyethylene shrink film Vicat softening point that the present embodiment makes is 86 ℃.
embodiment 4.
A kind of low-temperature polyethylene shrink film, described low-temperature polyethylene shrink film consists of the film of three-layer co-extruded bonding, i.e. skin, intermediate layer and internal layer;
The height that described skin is 65% by percentage by weight is molten refers to that blown film level polyethylene, 13% coating level polyethylene, 22% metallocene PE form;
The height that described intermediate layer is 33% by percentage by weight is molten refers to that blown film level polyethylene, 22% coating level polyethylene, 45% metallocene PE form;
It is identical with outer field raw material composition that the raw material of described internal layer forms;
The molten poly melt index>=4g/10min of blown film level, the density≤0.925g/cm of referring to of described height
3, it is to raise the molten blown film level polyethylene that refers to of height of sub-BASF 2420K, Tao Shi 5005 arbitrary proportions mixing that the present embodiment is selected model; Poly melt index>=the 7g/10min of described coating level, density are 0.910g/cm
3~ 0.930g/cm
3, it is the coating level polyethylene that LG chemistry LB9500, Mitsui Chemicals 105 arbitrary proportions mix that the present embodiment is selected model; Described metallocene PE refers to melt index>=1g/10min, density≤0.930 g/cm
3metallocene linear-low density polyethylene, the metallocene linear-low density polyethylene that the present embodiment selects 2018HA arbitrary proportion that model is Dao Daer 2710, exxon chemical to mix.
Wherein, described outer field thickness: the thickness in intermediate layer: the ratio of the thickness of internal layer is 1:4:1.
A kind of film-blowing process of low-temperature polyethylene shrink film comprises following processing step:
(a) extrude: the raw material of skin, intermediate layer, internal layer is mixed respectively by weight percentage, then be sent to respectively the extruder of three-layer co-extruded blown film unit; Described three-layer co-extruded blown film unit is comprised of single screw extrusion machine, and the diameter of described single screw rod is 120mm, and rotating speed is 40r/min;
(b) blown film: the extruder inflation by three-layer co-extruded blown film unit makes the low-temperature polyethylene shrink film; The extrusion temperature of the screw rod of extruder is 137 ℃;
(c) cooling, the temperature of described cooling cold wind is 18 ℃.
The low-temperature polyethylene shrink film Vicat softening point that the present embodiment makes is 87 ℃.
embodiment 5.
A kind of low-temperature polyethylene shrink film, described low-temperature polyethylene shrink film consists of the film of three-layer co-extruded bonding, i.e. skin, intermediate layer and internal layer;
The height that described skin is 55% by percentage by weight is molten refers to that blown film level polyethylene, 18% coating level polyethylene, 27% metallocene PE form;
The height that described intermediate layer is 47% by percentage by weight is molten refers to that blown film level polyethylene, 20% coating level polyethylene, 33% metallocene PE form;
It is identical with outer field raw material composition that the raw material of described internal layer forms;
The molten poly melt index>=4g/10min of blown film level, the density≤0.925g/cm of referring to of described height
3, it is to raise the molten blown film level polyethylene that refers to of height of the 2426K of sub-BASF 2420K, CNOOC and Shell Petrochemicals Co., Ltd, Tao Shi 5005 arbitrary proportions mixing that the present embodiment is selected model; Poly melt index>=the 7g/10min of described coating level, density are 0.910g/cm
3~ 0.930g/cm
3, it is the coating level polyethylene that Qatar petrochemical industry MG70, LG chemistry LB7000, Mitsui Chemicals 403 arbitrary proportions mix that the present embodiment is selected model; Described metallocene PE refers to melt index>=1g/10min, density≤0.930 g/cm
3metallocene linear-low density polyethylene, the present embodiment is selected the metallocene linear-low density polyethylene that model is 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 kind of film-blowing process of low-temperature polyethylene shrink film comprises following processing step:
(a) extrude: the raw material of skin, intermediate layer, internal layer is mixed respectively by weight percentage, then be sent to respectively the extruder of three-layer co-extruded blown film unit; Described three-layer co-extruded blown film unit is comprised of single screw extrusion machine, and the diameter of described single screw rod is 130mm, and rotating speed is 42r/min;
(b) blown film: the extruder inflation by three-layer co-extruded blown film unit makes the low-temperature polyethylene shrink film; The extrusion temperature of the screw rod of extruder is 140 ℃;
(c) cooling, the temperature of described cooling cold wind is 19 ℃.
The low-temperature polyethylene shrink film Vicat softening point that the present embodiment makes is 87 ℃.
The physical property of the low-temperature polyethylene shrink film of embodiments of the invention 1 ~ embodiment 5 preparations is as follows:
Contrast by table 1 can be found out: low-temperature polyethylene shrink film prepared by the present invention on the basis that keeps tearing strength, fracture tensile strength, elongation at break, percent thermal shrinkage, glossiness and mist degree obviously are better than the ordinary hot shrink film; Vicat softening point, DSC are lower than the ordinary hot shrink film, low-temperature polyethylene shrink film flexibility, the bright property of preparation are high, can be used for the Tetra Pak that flexibility and bright property are had relatively high expectations, fruit grain paper bag packing, to packing and require very low product that good adaptability is arranged to package temperature by shrink film.
Finally should be noted that; above embodiment is only for illustrating technical scheme of the present invention but not limiting the scope of the invention; although with reference to preferred embodiment, the present invention is explained in detail; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement technical scheme of the present invention, and not break away from essence and the scope of technical solution of the present invention.
Claims (10)
1. a low-temperature polyethylene shrink film, described low-temperature polyethylene shrink film consists of the film of three-layer co-extruded bonding, i.e. outer, intermediate layer and internal layer; It is characterized in that:
The height that described skin is 50% ~ 70% by percentage by weight is molten refers to that blown film level polyethylene, 5% ~ 25% coating level polyethylene, 20% ~ 30% metallocene PE form;
The height that described intermediate layer is 30% ~ 50% by percentage by weight is molten refers to that blown film level polyethylene, 20% ~ 30% coating level polyethylene, 20% ~ 50% metallocene PE form;
The height that described internal layer is 50% ~ 70% by percentage by weight is molten refers to that blown film level polyethylene, 5% ~ 25% coating level polyethylene, 20% ~ 30% metallocene PE form;
Described height is molten refers to that blown film level polyethylene is melt index>=4g/10min, density≤0.925g/cm
3low density polyethylene (LDPE);
Described coating level polyethylene is that melt index>=7g/10min, density are 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.
2. a kind of low-temperature polyethylene shrink film according to claim 1, it is characterized in that: described outer field thickness: the thickness in intermediate layer: the ratio of the thickness of internal layer is 1:2:1 ~ 1:4:1.
3. a kind of low-temperature polyethylene shrink film according to claim 1 is characterized in that: the height that described skin is 60% ~ 70% by percentage by weight is molten refers to that blown film level polyethylene, 5% ~ 10% coating level polyethylene, 25% ~ 30% metallocene PE form; It is identical with outer field raw material composition that the raw material of described internal layer forms.
4. a kind of low-temperature polyethylene shrink film according to claim 1 is characterized in that: the height that described skin is 50% ~ 60% by percentage by weight is molten refers to that blown film level polyethylene, 10% ~ 20% coating level polyethylene, 25% ~ 30% metallocene PE form; It is identical with outer field raw material composition that the raw material of described internal layer forms.
5. a kind of low-temperature polyethylene shrink film according to claim 1 is characterized in that: the height that described skin is 55% ~ 65% by percentage by weight is molten refers to that blown film level polyethylene, 8% ~ 17% coating level polyethylene, 22% ~ 28% metallocene PE form; It is identical with outer field raw material composition that the raw material of described internal layer forms.
6. a kind of low-temperature polyethylene shrink film according to claim 1 is characterized in that: the height that described intermediate layer is 40% ~ 50% by percentage by weight is molten refers to that blown film level polyethylene, 25% ~ 30% coating level polyethylene, 20% ~ 35% metallocene PE form.
7. a kind of low-temperature polyethylene shrink film according to claim 1 is characterized in that: the height that described intermediate layer is 30% ~ 40% by percentage by weight is molten refers to that blown film level polyethylene, 20% ~ 25% coating level polyethylene, 35% ~ 50% metallocene PE form.
8. a kind of low-temperature polyethylene shrink film according to claim 1 is characterized in that: the height that described intermediate layer is 33% ~ 45% by percentage by weight is molten refers to that blown film level polyethylene, 22% ~ 28% coating level polyethylene, 27% ~ 45% metallocene PE form.
9. the film-blowing process of the described a kind of low-temperature polyethylene shrink film of claim 1 ~ 8 any one is characterized in that: comprise following processing step:
(a) extrude: the raw material of skin, intermediate layer, internal layer is mixed respectively by weight percentage, then be sent to respectively the extruder of three-layer co-extruded blown film unit; Described three-layer co-extruded blown film unit is comprised of single screw extrusion machine, and the diameter of single screw rod is 90mm ~ 130mm, and rotating speed is 40 ~ 45r/min;
(b) blown film: the extruder inflation by three-layer co-extruded blown film unit makes the low-temperature polyethylene shrink film; The extrusion temperature of the screw rod of extruder is 130 ℃ ~ 140 ℃; The blow-up ratio of described blown film is 2 ~ 3;
(c) cooling: the temperature of cooling cold wind≤19 ℃.
10. the film-blowing process of a kind of low-temperature polyethylene shrink film according to claim 9, is characterized in that: described low-temperature polyethylene shrink film Vicat softening point≤90 ℃.
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| 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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| CN103879112A (en) * | 2014-02-26 | 2014-06-25 | 成都市兴恒泰印务有限公司 | Polyethylene film for plastic compound flexible package and blow molding 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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