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Method for producing thick low hot shrinkage rate polyester film

A technology of polyester film and production method, which is applied in the field of film manufacturing, can solve problems such as impact on the use of end products, no significant reduction in shrinkage rate, inconvenience in product production and processing, etc., and achieve the effect of reducing longitudinal shrinkage rate

Active Publication Date: 2009-06-10
JIANGSU YUXING FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the relaxation process of the film, the thermal shrinkage rate in the transverse direction can reach a small value, but the thermal shrinkage rate in the longitudinal direction is usually above 1.0%, and the shrinkage rate has not been significantly reduced, so the inconsistent shrinkage rate of the film in the longitudinal and transverse directions will cause It will bring inconvenience to the production and processing of subsequent products, and will also have a great impact on the use of end products

Method used

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  • Method for producing thick low hot shrinkage rate polyester film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The present invention produces thick type low thermal shrinkage polyester film, carries out according to the following steps.

[0016] (1), adopt direct esterification process to prepare pure polyester chips and those containing anti-blocking agent as polyester masterbatch. Mix TPA and EG in a molar ratio of 1:1.1-1:2.0, and then add SiO 2 Ethylene glycol suspension and catalyst, stabilizer for esterification, wherein SiO 2 The mass fraction is 0.01%-0.8%, and then the polycondensation reaction is carried out at 260°C-290°C, the vacuum degree is 10pa-70pa, and the reaction time is 2-3h, and the polyester chip raw material is obtained. After the polyester raw material is dried, the polyester raw material with a moisture content of less than 30ppm is sent into the extruder to be melted, and the thick sheet is extruded through the melt pipe, the coarse filter, the fine filter and the die head. The temperature of the head is controlled at 280°C-285°C, the line speed of th...

Embodiment 2

[0023] The present invention produces thick type low thermal shrinkage polyester film, carries out according to the following steps.

[0024] (1) After the polyester raw material is dried, feed the polyester raw material with a moisture content of less than 40ppm into the extruder to melt, and extrude a thick sheet through a melt pipe, a coarse filter, a fine filter and a die head, and extrude a thick The temperature of the die head is controlled at 285°C-290°C during sheeting, the line speed of the thick sheet is controlled at 0.15m / s-0.2m / s during extrusion, and the thick sheet is cooled with a casting roller at a temperature of 30°C and cold air .

[0025] (2) Longitudinal stretching, relaxation, and setting: the thick sheet is peeled off by the peeling roller, preheated by the roller at a temperature of 75°C-80°C, and the thick sheet is heated in an infrared heating zone of 120°C-140°C. The line speed of m / s-0.56m / s and the longitudinal stretching ratio of 2.5-2.8:1 are u...

Embodiment 3

[0031] The present invention produces thick type low thermal shrinkage polyester film, carries out according to the following steps.

[0032](1) After the polyester raw material is dried, the polyester raw material with a moisture content of less than 40ppm is sent into the extruder to melt, and the thick sheet is extruded through the melt pipe, the coarse filter, the fine filter and the die head, and the extruded The temperature of the die head is controlled at 290°C-295°C for thick sheets, and the line speed of thick sheets is controlled at 0.15m / s-0.2m / s during extrusion. cool down.

[0033] (2) Longitudinal stretching, relaxation, and setting: the thick sheet is peeled off by the peeling roller, preheated by a roller at a temperature of 75°C-80°C, and the thick sheet is heated in an infrared heating zone of 120°C-140°C. M / s-0.56m / s line speed, 2.5-2.8:1 longitudinal stretching ratio for longitudinal stretching, time control within 0.3s for longitudinal stretching, and the...

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Abstract

The process of producing thick polyester film with low thermal shrinkage rate includes the following steps: 1. melting material, extruding thick sheet and cooling; 2. stripping thick sheet, heating, longitudinally stretching in the line speed of 0.2-1.1 m / s and stretching power of 2.0-3.5 to 1, longitudinally relaxing and fixing; 3. preheating, transversely stretching at 110-160 deg.c and in stretching power of 3.0-5.0 to 1, longitudinally and transversely relaxing, and fixing; 4. cooling in the line speed lower than line speed in transverse stretching, heating, longitudinally post-relaxing, cooling and fixing; 5. high voltage corona treatment; and 6. winding the film in the line speed lower than the longitudinally relaxing line speed and in the tension controlled in 100-250 N. The process can reduce the longitudinal thermal shrinkage rate to near to or equal to the transverse thermal shrinkage rate.

Description

technical field [0001] The invention relates to a production method of a thick polyester film with a thickness of (0.1 mm-0.35 mm) and a low thermal shrinkage rate used for substrates such as membrane switches and flexible printed circuit boards, and belongs to the field of film manufacturing. Background technique [0002] With the rapid development of the electronics industry and the improvement of people's living standards, electronic products tend to develop in the direction of ultra-light and ultra-thin, which significantly increases the demand for membrane switches, flexible printed circuit boards, etc., and the thickness of their substrates Type polyester film will be more widely used. A conventional membrane switch consists of a mask layer, an isolation layer, an upper circuit board, a lower circuit board, a connecting plug, and an adhesive layer for bonding between layers from top to bottom. The mask layer is usually made of biaxially stretched polyester film, which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C69/00B29C47/14B29C47/92B29C55/14B29C71/02B29C71/04B29K67/00B29L7/00B29C48/305B29C48/92
CPCB29C48/92B29C2948/92523B29C2948/92704B29C2948/92904B29C2948/92923
Inventor 刘勤学周波顾洪林
Owner JIANGSU YUXING FILM TECH
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