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Longitudinal drawing method and device of two-directional drawn polyester film

A technology of biaxial stretching polyester and longitudinal stretching, which is applied to flat products, household utensils, and other household utensils. It can solve the problems of reduced film thickness uniformity, easy film breakage, and poor thickness, etc., to achieve thickness uniformity Good, high stretching efficiency, less film breaking times

Inactive Publication Date: 2018-06-05
爱思开迈克沃尖端塑料(江苏)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantages of the existing longitudinal stretching device and method of biaxially stretched polyester film are: in the longitudinal stretching stage, due to the excessive number of repetitions of cooling and heating processes in the middle, not only the thickness uniformity of the film is reduced, but also the longitudinal stretching The efficiency of the stretching device is not high; in the longitudinal stretching stage, the thickness of the slab is not sufficiently stretched to a high degree of longitudinal extension, because it is generally believed that excessive high-power longitudinal extension will lead to poor thickness at both ends of the slab, which may lead to subsequent The transverse stretching link is prone to unfavorable phenomena such as film breakage and unevenness

Method used

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  • Longitudinal drawing method and device of two-directional drawn polyester film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The polyester chips with an intrinsic viscosity of 0.63 dL / g are melt-extruded through a die at a slab forming speed of 60 m / min at 280° C. to produce unstretched slabs. exist figure 1 In the longitudinal stretching device, the roll temperature of the preheating roll 1 is 100°C, the roll temperature of the first stretching roll 2 is 120°C, the roll temperature of the primary cooling roll 3 is 30°C, and the roll temperature of the secondary preheating roll is 100°C. 110°C, the roll temperature of the slow roll 5 and the medium speed roll 6 is 125°C, and the roll temperature of the fast roll 7 and the secondary cooling roll 8 is 20°C. Carry out the first segment of longitudinal stretching with a draw ratio of 2.0 times between the primary cooling roll 3, and carry out the second segment of longitudinal stretch with a draw ratio of 1.5 times between the slow roll 5 and the medium speed roll 6, and the medium speed roll 6 Carry out the third section longitudinal stretching...

Embodiment 2

[0027] The slab forming speed in Example 1 is 61.7m / min, the roll temperature of the first stretching roll 2 is 115°C, the stretching ratio of the first segment of longitudinal stretching is 1.5 times, and the stretching ratio of the second segment of longitudinal stretching is 1.5 times. Stretch ratio is 1.8 times, and the draw ratio of the third segment longitudinal stretch is 1.8 times, and the draw ratio of transverse stretch is 3.6 times to carry out, and all the other are consistent with the data of embodiment 1.

Embodiment 3

[0029] The slab forming speed in Example 1 was 45.5 m / min, the roll temperature of the first stretching roll 2 was 115°C, the temperature of the No. 9 roll was 130°C, and the draw ratio of the first longitudinal stretch was 1.5 times, The stretching ratio of the second stage longitudinal stretching is 1.8 times, the stretching ratio of the third stage longitudinal stretching is 2.0 times, and the stretching ratio of the transverse stretching is 4.4 times to carry out, all the other are consistent with the data of embodiment 1.

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Abstract

The invention provides a longitudinal drawing method of a two-directional drawn polyester film. The method comprises the following step: carrying out primary pre-heating, longitudinal drawing of a first section, primary cooling, secondary pre-heating, longitudinal drawing of a second section, longitudinal drawing of a third section and secondary cooling successively on an unextended sheet on a longitudinal drawing device, wherein the primary pre-heating temperature is 98-102 DEG C; the secondary pre-heating temperature is 108-112 DEG C; the primary cooling temperature is 28-32 DEG C; the secondary cooling temperature is 18-22 DEG C; the draw ratio of longitudinal drawing of the first section is 1.5-2.0 times and the drawing temperature is 115-120 DEG C, the draw ratio of longitudinal drawing of the second section is 1.5-1.8 times and the drawing temperature is 120-125 DEG C, and the draw ratio of longitudinal drawing of the third section is 1.5-2.0 times and the drawing temperature is125-130 DEG C. The invention also provides a longitudinal drawing device suitable for the method. The method has the advantage that the produced two-directional drawn polyester films are relatively good in thickness uniformity.

Description

technical field [0001] The invention belongs to the field of polyester film preparation, and in particular relates to a longitudinal stretching method and device for a biaxially stretched polyester film. Background technique [0002] Biaxially oriented polyester film is widely used in tapes, packaging, photosensitive, electrical insulation, printing, drawing, fields such as labels. In order to make the polyester film perform better than its actual use performance in various fields, it needs to have better comprehensive physical and chemical properties and thickness uniformity. [0003] The biaxial stretching method is a conventional method to ensure that the polyester film has good physical and chemical properties and thickness uniformity, especially the longitudinal extension in the biaxial stretching has a particularly prominent impact on the comprehensive properties of the film. The method for preparing polyester film by biaxial stretching was first recorded in Japanese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/12B29K67/00B29L7/00
CPCB29C55/12B29K2067/00B29L2007/00
Inventor 刘志祥夏晓璐虞晓波王荣李峰李健姜圣华苗曼谷
Owner 爱思开迈克沃尖端塑料(江苏)有限公司
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