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Thermal-shrinkage film production process

A production process and heat shrinkable film technology, which can be applied to other household appliances, flat products, household appliances, etc., and can solve problems such as inapplicability to temperature-sensitive products, limiting the scope of application, and affecting the quality of packaged items.

Inactive Publication Date: 2015-05-27
CHANGJI LYUYUAN PLASTIC PACKAGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional POF film usually needs to be above 110°C to completely shrink, but the higher packaging temperature has an impact on the quality of the packaged items, so it is not suitable for the packaging of temperature-sensitive products, which limits its application range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A heat-shrinkable film production process, the heat-shrinkable film sequentially includes three layers of an upper surface layer, a core layer and a lower surface layer, and the steps of the production method are as follows:

[0014] 1) Take 50 parts by weight of copolymerized polypropylene and 6 parts by weight of anti-adhesive masterbatch as the upper surface layer raw materials; get 110 parts by weight of ethylene-octene copolymer, 8 parts by weight of smooth masterbatch and 4 parts by weight of antistatic masterbatch as the core Layer raw material; Get 60 parts by weight of copolymerized polypropylene and 8 parts by weight of anti-bonding masterbatch as lower surface layer raw material;

[0015] 2) Extrude the mixed upper, lower surface layer and core layer raw materials on three single-screw extruders respectively. The extrusion temperature of the extruder is set at 205°C, the extrusion temperature of the lower surface single-screw extruder is set at 210°C, and the...

Embodiment 2

[0019] A heat-shrinkable film production process, the heat-shrinkable film sequentially includes three layers of an upper surface layer, a core layer and a lower surface layer, and the steps of the production method are as follows:

[0020] 1) Take 45 parts by weight of copolymerized polypropylene and 5 parts by weight of anti-adhesive masterbatch as the upper surface layer raw materials; get 105 parts by weight of ethylene-octene copolymer, 6 parts by weight of smooth masterbatch and 3 parts by weight of antistatic masterbatch as the core Layer raw material; Get 50 parts by weight of copolymerized polypropylene and 7 parts by weight of anti-bonding masterbatch as the lower surface layer raw material;

[0021] 2) Extrude the mixed upper, lower surface layer and core layer raw materials on three single-screw extruders respectively. The extrusion temperature of the extruder is set at 205°C, the extrusion temperature of the lower surface single-screw extruder is set at 210°C, and...

Embodiment 3

[0025] A heat-shrinkable film production process, the heat-shrinkable film sequentially includes three layers of an upper surface layer, a core layer and a lower surface layer, and the steps of the production method are as follows:

[0026] 1) Take 48 parts by weight of copolymerized polypropylene and 5.6 parts by weight of anti-adhesive masterbatch as the upper surface layer raw materials; get 107 parts by weight of ethylene-octene copolymer, 6.8 parts by weight of smooth masterbatch and 3.4 parts by weight of antistatic masterbatch as the core Layer raw material; Get 55 parts by weight of copolymerized polypropylene and 7.8 parts by weight of anti-bonding masterbatch as lower surface layer raw material;

[0027] 2) Extrude the mixed upper, lower surface layer and core layer raw materials on three single-screw extruders respectively. The extrusion temperature of the extruder is set at 205°C, the extrusion temperature of the lower surface single-screw extruder is set at 210°C,...

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Abstract

The invention discloses a thermal-shrinkage film production process. A thermal-shrinkage film sequentially comprises an upper surface layer, a core layer and a lower surface layer. The production method comprises the following steps: 1) taking raw materials; 2) respectively extruding blended upper surface layer raw materials, blended lower surface layer raw materials and blended core raw materials on three single-screw extruders to obtain pipe blanks by virtue of three-layer co-extrusion die heads which have the temperature of 205 DEG C, cooling and pulling the pipe blanks into a stretching baking oven; 3) firstly preheating the pipe blanks in a preheating baking oven, then inflating in the stretching baking oven at the temperature of 450-190 DEG C to perform transverse and longitudinal stretching to obtain a film with the thickness of 8-9mu m, wherein the stretching temperature is 120 DEG C, the transverse stretching ratio is 6, and the longitudinal stretching ratio is 6.5; and 4), forcibly cooling the stretched film by use of an air ring, equally splitting, reeling and slitting to obtain a product. The thermal-shrinkage film produced by the production method can achieve a thermal shrinkage ratio of 45% under a condition that the temperature is 80-100 DEG C, and can meet the low-temperature thermal-shrinkage package requirement.

Description

technical field [0001] The invention relates to a heat shrinkable film production process flow. Background technique [0002] At present, the heat-shrinkable packaging film produced by biaxial stretching co-extrusion technology with linear low-density polyethylene as the middle layer and copolymerized polypropylene as the inner and outer layers has been widely used in the fields of food, medicine, and daily necessities. POF film is favored in the field of flexible packaging due to its excellent properties such as high transparency and high shrinkage. However, the conventional POF film usually needs to be above 110°C to completely shrink, but the higher packaging temperature has an impact on the quality of the packaged items, so it is not suitable for packaging temperature-sensitive products, which limits its application range. Contents of the invention [0003] The purpose of the present invention is to provide a heat shrinkable film production process, the heat shrinkabl...

Claims

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Application Information

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IPC IPC(8): B29D7/01
Inventor 刘标张屹鹏
Owner CHANGJI LYUYUAN PLASTIC PACKAGING
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