CN103753825A - Production method of multilayer co-extruded low-temperature shrinkable polyolefin heat-shrinkable film - Google Patents
Production method of multilayer co-extruded low-temperature shrinkable polyolefin heat-shrinkable film Download PDFInfo
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Abstract
The invention discloses a production method of a multilayer co-extruded low-temperature shrinkable polyolefin heat-shrinkable film. The multilayer co-extruded low-temperature shrinkable polyolefin heat-shrinkable film orderly comprises an upper surface layer, a core layer and a lower surface layer. The production method comprises the following steps of 1, taking raw materials, 2, respectively extruding the upper surface layer, the lower surface layer and the core layer by three single screw extruders, extruding a pipe blank by a three-layer co-extrusion mold head at a co-extrusion mold head temperature of 205 DEG C, carrying out cooling, and drawing the cooled pipe blank into a stretching oven, 3, feeding the pipe blank into a pre-heating oven, carrying out pre-heating, then filling the stretching oven having a temperature of 450-190 DEG C with gas, carrying out transverse and longitudinal stretching under the conditions of a stretching temperature of 120 DEG C, a transverse stretching ratio of 6 and a longitudinal stretching ratio of 6.5 to obtain a film having the thickness of 8-9 micrometers, and 4, carrying out rotary air forced cooling on the stretched film, splitting the film into two equal parts, carrying out rolling, and carrying out slitting to obtain the product. The multilayer co-extruded low-temperature shrinkable polyolefin heat-shrinkable film has a hot-shrinkage rate of 45% at a temperature of 80-100 DEG C and can satisfy low-temperature hot-shrinkage packaging requirements.
Description
Technical field
The present invention relates to the production method of multi-layer co-extruded low-temperature shrink Polyolefin Heat Shrinkable Film.
Background technology
At present, take LLDPE as intermediate layer, co-polypropylene is ectonexine compound extruded, and the heat shrinkable package film that biaxial tension co-extrusion technology is produced is widely applied in fields such as food, medicine, commodity.POF film, owing to having the premium properties such as the high grade of transparency, high shrinkage, enjoys favor in flexible package field.But conventional POF film need to more than 110 ℃ could shrink conventionally completely, but higher package temperature has impact to the quality of connection with wrapping of piece, therefore it is not suitable for the packing to responsive to temperature product, has limited its range of application.
Summary of the invention
The object of the present invention is to provide a kind of production method of multi-layer co-extruded low-temperature shrink Polyolefin Heat Shrinkable Film, the heat shrink films of its production can obtain 45% percent thermal shrinkage under 80-100 ℃ of condition, can meet the packing instructions that Low Temperature Thermal shrinks.
For achieving the above object, technical scheme of the present invention is the production method of a kind of multi-layer co-extruded low-temperature shrink Polyolefin Heat Shrinkable Film of design, and described heat shrink films comprises three layers, upper epidermis, sandwich layer and lower top layer successively, and described production method step is as follows:
1) get 45-50 weight portion co-polypropylene and 5-6 weight portion bonding-prevention master batch as upper epidermis raw material; Get 105-110 parts by weight of ethylene-octene copolymer, the smooth masterbatch of 6-8 weight portion and 3-4 weight portion antistatic master batch as sandwich layer raw material; Get 50-60 weight portion co-polypropylene and 7-8 weight portion bonding-prevention master batch as lower top layer raw material;
2) the upper and lower top layer being mixed and sandwich layer raw material are extruded respectively on three single screw extrusion machines, the extrusion temperature of upper epidermis single screw extrusion machine is set as 220 ℃, the extrusion temperature of sandwich layer single screw extrusion machine is set as 205 ℃, the extrusion temperature of lower top layer single screw extrusion machine is set as 210 ℃, by triple extrusion die head, be extruded into pipe, co-extrusion die head temperature is 205 ℃, and enters drawing oven through cooling rear haulage;
3) first pipe enters preheating oven preheating, and in preheating oven, the temperature in 1 district-4 district is respectively: 220 ℃, 260 ℃, 300 ℃, 350 ℃; Then in temperature is the drawing oven of 450-190 ℃, horizontal and vertical stretching is carried out in inflation, and in drawing oven, the temperature in 5 district-8 districts is respectively: 430 ℃, 410 ℃, 280 ℃, 200 ℃; Draft temperature is 120 ℃, and cross directional stretch multiple is 6, and longitudinal stretching multiple is 6.5, is drawn into the film of 8-9 μ m thickness;
4) to the film after stretching, take vane to force cooling, to dividing, cut rear rolling open, cut and obtain product.
Advantage of the present invention and beneficial effect are: the production method that a kind of multi-layer co-extruded low-temperature shrink Polyolefin Heat Shrinkable Film is provided, the heat shrink films of its production can obtain 45% percent thermal shrinkage under 80-100 ℃ of condition, can meet the packing instructions that Low Temperature Thermal shrinks.
The specific embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is further described.Following examples are only for technical scheme of the present invention is more clearly described, and can not limit the scope of the invention with this.
The concrete technical scheme of implementing of the present invention is:
Embodiment 1
A production method for multi-layer co-extruded low-temperature shrink Polyolefin Heat Shrinkable Film, described heat shrink films comprises three layers, upper epidermis, sandwich layer and lower top layer successively, described production method step is as follows:
1) get 50 weight portion co-polypropylenes and 6 weight portion bonding-prevention master batchs as upper epidermis raw material; Get 110 parts by weight of ethylene-octene copolymer, the smooth masterbatch of 8 weight portion and 4 weight portion antistatic master batch as sandwich layer raw material; Get 60 weight portion co-polypropylenes and 8 weight portion bonding-prevention master batchs as lower top layer raw material;
2) the upper and lower top layer being mixed and sandwich layer raw material are extruded respectively on three single screw extrusion machines, the extrusion temperature of upper epidermis single screw extrusion machine is set as 220 ℃, the extrusion temperature of sandwich layer single screw extrusion machine is set as 205 ℃, the extrusion temperature of lower top layer single screw extrusion machine is set as 210 ℃, by triple extrusion die head, be extruded into pipe, co-extrusion die head temperature is 205 ℃, and enters drawing oven through cooling rear haulage;
3) first pipe enters preheating oven preheating, and in preheating oven, the temperature in 1 district-4 district is respectively: 220 ℃, 260 ℃, 300 ℃, 350 ℃; Then in temperature is the drawing oven of 450-190 ℃, horizontal and vertical stretching is carried out in inflation, and in drawing oven, the temperature in 5 district-8 districts is respectively: 430 ℃, 410 ℃, 280 ℃, 200 ℃; Draft temperature is 120 ℃, and cross directional stretch multiple is 6, and longitudinal stretching multiple is 6.5, is drawn into the film of 9 μ m thickness;
4) to the film after stretching, take vane to force cooling, to dividing, cut rear rolling open, cut and obtain product.
Embodiment 2
A production method for multi-layer co-extruded low-temperature shrink Polyolefin Heat Shrinkable Film, described heat shrink films comprises three layers, upper epidermis, sandwich layer and lower top layer successively, described production method step is as follows:
1) get 45 weight portion co-polypropylenes and 5 weight portion bonding-prevention master batchs as upper epidermis raw material; Get 105 parts by weight of ethylene-octene copolymer, the smooth masterbatch of 6 weight portion and 3 weight portion antistatic master batch as sandwich layer raw material; Get 50 weight portion co-polypropylenes and 7 weight portion bonding-prevention master batchs as lower top layer raw material;
2) the upper and lower top layer being mixed and sandwich layer raw material are extruded respectively on three single screw extrusion machines, the extrusion temperature of upper epidermis single screw extrusion machine is set as 220 ℃, the extrusion temperature of sandwich layer single screw extrusion machine is set as 205 ℃, the extrusion temperature of lower top layer single screw extrusion machine is set as 210 ℃, by triple extrusion die head, be extruded into pipe, co-extrusion die head temperature is 205 ℃, and enters drawing oven through cooling rear haulage;
3) first pipe enters preheating oven preheating, and in preheating oven, the temperature in 1 district-4 district is respectively: 220 ℃, 260 ℃, 300 ℃, 350 ℃; Then in temperature is the drawing oven of 450-190 ℃, horizontal and vertical stretching is carried out in inflation, and in drawing oven, the temperature in 5 district-8 districts is respectively: 430 ℃, 410 ℃, 280 ℃, 200 ℃; Draft temperature is 120 ℃, and cross directional stretch multiple is 6, and longitudinal stretching multiple is 6.5, is drawn into the film of 8 μ m thickness;
4) to the film after stretching, take vane to force cooling, to dividing, cut rear rolling open, cut and obtain product.
Embodiment 3
A production method for multi-layer co-extruded low-temperature shrink Polyolefin Heat Shrinkable Film, described heat shrink films comprises three layers, upper epidermis, sandwich layer and lower top layer successively, described production method step is as follows:
1) get 48 weight portion co-polypropylenes and 5.6 weight portion bonding-prevention master batchs as upper epidermis raw material; Get 107 parts by weight of ethylene-octene copolymer, the smooth masterbatch of 6.8 weight portion and 3.4 weight portion antistatic master batch as sandwich layer raw material; Get 55 weight portion co-polypropylenes and 7.8 weight portion bonding-prevention master batchs as lower top layer raw material;
2) the upper and lower top layer being mixed and sandwich layer raw material are extruded respectively on three single screw extrusion machines, the extrusion temperature of upper epidermis single screw extrusion machine is set as 220 ℃, the extrusion temperature of sandwich layer single screw extrusion machine is set as 205 ℃, the extrusion temperature of lower top layer single screw extrusion machine is set as 210 ℃, by triple extrusion die head, be extruded into pipe, co-extrusion die head temperature is 205 ℃, and enters drawing oven through cooling rear haulage;
3) first pipe enters preheating oven preheating, and in preheating oven, the temperature in 1 district-4 district is respectively: 220 ℃, 260 ℃, 300 ℃, 350 ℃; Then in temperature is the drawing oven of 450-190 ℃, horizontal and vertical stretching is carried out in inflation, and in drawing oven, the temperature in 5 district-8 districts is respectively: 430 ℃, 410 ℃, 280 ℃, 200 ℃; Draft temperature is 120 ℃, and cross directional stretch multiple is 6, and longitudinal stretching multiple is 6.5, is drawn into the film of 8.5 μ m thickness;
4) to the film after stretching, take vane to force cooling, to dividing, cut rear rolling open, cut and obtain product.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
1. the production method of multi-layer co-extruded low-temperature shrink Polyolefin Heat Shrinkable Film, described heat shrink films comprises three layers, upper epidermis, sandwich layer and lower top layer successively, described production method step is as follows:
1) get 45-50 weight portion co-polypropylene and 5-6 weight portion bonding-prevention master batch as upper epidermis raw material; Get 105-110 parts by weight of ethylene-octene copolymer, the smooth masterbatch of 6-8 weight portion and 3-4 weight portion antistatic master batch as sandwich layer raw material; Get 50-60 weight portion co-polypropylene and 7-8 weight portion bonding-prevention master batch as lower top layer raw material;
2) the upper and lower top layer being mixed and sandwich layer raw material are extruded respectively on three single screw extrusion machines, the extrusion temperature of upper epidermis single screw extrusion machine is set as 220 ℃, the extrusion temperature of sandwich layer single screw extrusion machine is set as 205 ℃, the extrusion temperature of lower top layer single screw extrusion machine is set as 210 ℃, by triple extrusion die head, be extruded into pipe, co-extrusion die head temperature is 205 ℃, and enters drawing oven through cooling rear haulage;
3) first pipe enters preheating oven preheating, and in preheating oven, the temperature in 1 district-4 district is respectively: 220 ℃, 260 ℃, 300 ℃, 350 ℃; Then in temperature is the drawing oven of 450-190 ℃, horizontal and vertical stretching is carried out in inflation, and in drawing oven, the temperature in 5 district-8 districts is respectively: 430 ℃, 410 ℃, 280 ℃, 200 ℃; Draft temperature is 120 ℃, and cross directional stretch multiple is 6, and longitudinal stretching multiple is 6.5, is drawn into the film of 8-9 μ m thickness;
4) to the film after stretching, take vane to force cooling, to dividing, cut rear rolling open, cut and obtain product.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104647783A (en) * | 2014-12-03 | 2015-05-27 | 昌吉市绿源塑料包装有限公司 | Thermal-shrinkage film production process |
| CN105437694A (en) * | 2016-01-15 | 2016-03-30 | 卫辉市银金达薄膜有限公司 | Heat shrinkable E-PET composite membrane and manufacturing method thereof |
| CN105882078A (en) * | 2014-10-08 | 2016-08-24 | 山东中塑泰富科技有限公司 | Technology for applying novel resin POE to POF polyolefin shrink film |
| CN108516212A (en) * | 2018-03-30 | 2018-09-11 | 浙江众成包装材料股份有限公司 | A kind of multi-layer co-extruded low temperature polyolefin crosslinking heat shrink films and preparation method thereof |
| CN113459469A (en) * | 2020-03-15 | 2021-10-01 | 聚银塑料包装制品（深圳）有限公司 | Method for detecting layer thickness deviation and distribution of POF blown film co-extrusion die head discharge pipe |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103358560A (en) * | 2013-07-29 | 2013-10-23 | 湖北工程学院 | Production method of multi-layer co-extruded low-temperature contraction polyolefin thermal contraction membrane |
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- 2013-12-11 CN CN201310668704.1A patent/CN103753825A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103358560A (en) * | 2013-07-29 | 2013-10-23 | 湖北工程学院 | Production method of multi-layer co-extruded low-temperature contraction polyolefin thermal contraction membrane |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105882078A (en) * | 2014-10-08 | 2016-08-24 | 山东中塑泰富科技有限公司 | Technology for applying novel resin POE to POF polyolefin shrink film |
| CN105882078B (en) * | 2014-10-08 | 2017-10-10 | 山东中塑泰富科技有限公司 | Resin POE applies the method in POF polyolefin shrink films |
| CN104647783A (en) * | 2014-12-03 | 2015-05-27 | 昌吉市绿源塑料包装有限公司 | Thermal-shrinkage film production process |
| CN105437694A (en) * | 2016-01-15 | 2016-03-30 | 卫辉市银金达薄膜有限公司 | Heat shrinkable E-PET composite membrane and manufacturing method thereof |
| CN108516212A (en) * | 2018-03-30 | 2018-09-11 | 浙江众成包装材料股份有限公司 | A kind of multi-layer co-extruded low temperature polyolefin crosslinking heat shrink films and preparation method thereof |
| CN113459469A (en) * | 2020-03-15 | 2021-10-01 | 聚银塑料包装制品（深圳）有限公司 | Method for detecting layer thickness deviation and distribution of POF blown film co-extrusion die head discharge pipe |
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Application publication date: 20140430 |