JPS56139930A - Stretching method for acrylonitrile polymer film - Google Patents
Stretching method for acrylonitrile polymer filmInfo
- Publication number
- JPS56139930A JPS56139930A JP4505280A JP4505280A JPS56139930A JP S56139930 A JPS56139930 A JP S56139930A JP 4505280 A JP4505280 A JP 4505280A JP 4505280 A JP4505280 A JP 4505280A JP S56139930 A JPS56139930 A JP S56139930A
- Authority
- JP
- Japan
- Prior art keywords
- stretched
- film
- wide
- copolymer
- original film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
PURPOSE: To obtain a film which is excellent in an oxygen-insulating property and transparency, by a method wherein, in a continuous biaxial-stretching in a flat shape, the longitudinal width is stretched 1.2W1.98 times as wide as that of the original film at a specified temperature range and the lateral width is stretched 3.0W5.0 times as wide as that of the original film at the same temperature range.
CONSTITUTION: A copolymer, in which 50W95pts.wt. acrylonitrile and 50W5 pts.wt. acryl acid methyl are graft-polymerized, is fused under the existence of 3W30pts.wt. butadien-acrylonitrile copolymer containing 40W95wt%, and is extruded by a T-die method. The copolymer so extruded is continuously biaxial-stretched in a flat shape such that it is longitudinally stretched through the difference in a circumferential velocity between rolls, and consecutively, it is stretched transversely in a tenter. The longitudinal width is stretched 1.2W1.98 times as wide as that of the original film thereupon when the temperature of said copolymer remains at Tg-Tg+60°C (Tg: glass transition point), and the lateral width is stretched 3.0W 5.0 times as wide as that of the original film at the same temperature range. A drawing shows that the film, produced under this invention, equalizes in the thickness (μ) against the directional distance (mm) of the film.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4505280A JPS56139930A (en) | 1980-04-03 | 1980-04-03 | Stretching method for acrylonitrile polymer film |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4505280A JPS56139930A (en) | 1980-04-03 | 1980-04-03 | Stretching method for acrylonitrile polymer film |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56139930A true JPS56139930A (en) | 1981-10-31 |
Family
ID=12708576
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4505280A Pending JPS56139930A (en) | 1980-04-03 | 1980-04-03 | Stretching method for acrylonitrile polymer film |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56139930A (en) |
-
1980
- 1980-04-03 JP JP4505280A patent/JPS56139930A/en active Pending
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