SU1490126A1 - Method of producing polyethyleneterephthalate film - Google Patents

Abstract

This invention relates to a process for the production of film materials, namely biaxially oriented polyethylene terephthalate films. The invention provides an increase in strength and flatness due to the fact that the film obtained by extrusion from the melt, oriented first in the transverse direction at 80-100 ° C to a multiplicity of 3.5-4.5. Then, two-stage rolling is carried out in the longitudinal direction at 30–40 ° C until relative reduction of 11–19% on the first pair of rolls and at 35–45 ° C until relative reduction of 16–24% on the second pair of rolls with a ratio of their rotation rates 02-1.06. Orientational stretching is carried out in the longitudinal direction at 60-80 ° C with a tension force of 15-35 MPa to a multiplicity of 2.5-3.5. 1 tab.

Description

This invention relates to a process for the production of film materials, namely biaxially oriented polyethylene terephthalate films.

The purpose of the invention is to increase the strength and uniform thickness of polyethylene terephthalate films.

The invention is illustrated by the following examples.

Example 1 (comparative). An amorphous polyethylene terephthalate (PET) film is extruded, stretched first 3.5 times in the transverse direction and then 1.72 times in the longitudinal one at 170 s. The tensile strength of the resulting film is determined. Unevenness

film thickness is estimated from the results of 10 measurements per 1 rfM sample and is calculated as the ratio

Ah b-L1. “-C. hep

100%

four:

X)

where h

M ° ikc

MWW

wed

maximum thickness, µm; minimum thickness, micron; average value of the depth, microns.

The parameters of the method and the properties of the resulting PET film are shown in the table.

Examples 2-LO. An amorphous PET film is extruded, stretched.

Yu

SP)

it in the transverse direction, then rolled in the longitudinal direction between two pairs of rolls, then oriented in the longitudinal direction.

Claims (1)

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