Production technology for heat shrinkable polyester film

A polyester film and production process technology, applied in the production process field of heat-shrinkable polyester film, can solve the problems of hydrolysis and degradation to generate air bubbles, unfavorable recycling treatment, bonding blocks, etc., to prevent hydrolysis degradation and generation of air bubbles, avoid heating Too fast to avoid the effect of sticking to each other

Active Publication Date: 2014-03-19
TONGCHENG FURUN PACKAGING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Heat-shrinkable plastic films are often used in the packaging of convenience foods, beverages, electronic appliances, metal products, daily commodities, etc., especially shrink labels are the most important application fields. Heat-shrinkable plastic films are generally made of amorphous plastics. Such as polystyrene, polyvinyl chloride, PVDC, the invention patent application number is CN03129658.0, which has the characteristics of low thermal shrinkage rate, low haze, good friction performance, smooth winding, etc., but its raw materials contain elements such as chlorine , is not conducive to recycling and does not meet environmental protection requirements; moreover, the shrink film produced by this production process has low strength and is not impact resistant; in addition, it is easy to stick to each other during drying and extrusion during the production process Hydrolytic degradation and generation of bubbles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The process is divided into seven steps. First, (1) Slicing: First, the material extraction process is carried out, and the material obtained is non-crystalline polyethylene terephthalate, and then the raw material transportation process is carried out, and finally the pre-crystallization process is carried out, and then the (2) Vacuum drying: The equipment used is a vacuum drum dryer, heated to 70°C, and kept for 6 hours, and then carried out (3) Melt extrusion: The equipment used is a single-screw extruder, and the screw speed is adjusted to 62r / min, heating up, the temperature is sequentially increased to 170°C, 230°C, 258°C, 268°C, 274°C, each temperature is kept for 10 minutes, and then (4) Rapid cooling casting: first carry out the melting process, divide It is three steps of metering, filtration and casting, and then the molding process: the first step, electrostatic adsorption, the second step, cold drum: add distilled water, adjust the temperature to 25°C, then ...

Embodiment 2

[0038] Repeat Example 1 according to the same steps as described, the difference is: step (2) vacuum drying: heat up to 75°C, hold for 7h, step (3) melt extrusion: adjust the screw speed to 66r / min , the temperature is sequentially increased to 175°C, 235°C, 260°C, 270°C, 275°C, and each temperature is maintained for 15 minutes. Step (4) Quenching the cast sheet: Longitudinal stretching: In the cold drum process, add distilled water and adjust the temperature to 30°C, step (5) biaxial stretching: in the preheating process, the temperature is 72°C, in the stretching process, the temperature is 83°C, in the cooling process, the temperature is 32°C, in the pressing roll process, the temperature is 95°C, Transverse stretching: in the stretching process, first adjust the temperature to 95°C, keep it for 25 minutes, then adjust the temperature to 107°C, in the cooling process: adjust the temperature to 85°C, step 6) Cooling: heat up at a heating rate of 35°C / h to 165°C and hold for ...

Embodiment 3

[0040] Repeat Example 1 according to the same steps as described, the difference is: step (2) vacuum drying: heat up to 80°C, hold for 8h, step (3) melt extrusion: adjust the screw speed to 70r / min , the temperature is sequentially increased to 180°C, 240°C, 262°C, 272°C, 276°C, and the temperature is maintained for 20 minutes at each stage. Step (4) Quenching the cast sheet: Longitudinal stretching: In the cold drum process, add distilled water and adjust the temperature to 35°C, step (5) biaxial stretching: in the preheating process, the temperature is 85°C, in the stretching process, the temperature is 85°C, in the cooling process, the temperature is 35°C, in the pressing roll process, the temperature is 100°C, transverse Stretching: In the stretching process, first adjust the temperature to 100°C, keep it for 30 minutes, then adjust the temperature to 110°C, in the cooling process: adjust the temperature to 90°C, step 6) Cooling: raise the temperature to 40°C / h 170°C and k...

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PUM

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Abstract

The invention discloses a production technology for a heat shrinkable polyester film and relates to the package material field. The production technology comprises the following technologies: slicing, vacuum drying, melt extrusion, quenching slice casting, biaxial tension, cooling and rolling slitting. Amorphous polyethylene glycol terephthalate is selected as a raw material, amorphous polyethylene glycol terephthalate is easy to recycle, nontoxic and odourless, has good mechanical properties, and meets environment protection requirements. Heat is transferred to materials to be dried through a drier shell under the vacuum environment, and therefore the purpose of drying reinforcement is achieved. The softening point of polymers is raised effectively, adhesion and agglomeration of resin particles are avoided during the drying and melt extrusion processes, moisture in resins can be removed, and hydrolytic degradation and bubble generation of polymers containing ester groups are prevented during the melt extrusion process. The ways of segmented heating and segmented processing are beneficial for fusion of molecules, and avoid material deterioration caused by too fast heating. the intensity of the produced shrinkable film is raised, and the shrinkable film has impact resistance.

Description

technical field [0001] The invention belongs to the field of packaging materials, and more specifically, the invention relates to a production process of heat-shrinkable polyester film. Background technique [0002] Heat-shrinkable plastic films are often used in the packaging of convenience foods, beverages, electronic appliances, metal products, daily commodities, etc., especially shrink labels are the most important application fields. Heat-shrinkable plastic films are generally made of amorphous plastics. Such as polystyrene, polyvinyl chloride, PVDC, the invention patent application number is CN03129658.0, which has the characteristics of low thermal shrinkage rate, low haze, good friction performance, smooth winding, etc., but its raw materials contain elements such as chlorine , is not conducive to recycling and does not meet environmental protection requirements; moreover, the shrink film produced by this production process has low strength and is not impact resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D7/01
Inventor 杨峰
Owner TONGCHENG FURUN PACKAGING MATERIAL
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