Title:
【発明の名称】ポリエチレン系二軸延伸フイルムの製造方法
Document Type and Number:
Japanese Patent JP3030128
Kind Code:
B2
Abstract:
PURPOSE:To provide the manufacture method of low shrink biaxially oriented film, which has no uneven orientation and is excellent in thickness accuracy, out of resin mainly of linear low density polyethylene. CONSTITUTION:Un-oriented linear low density polyethylene sheet is stretched under the condition that the draw ratio at least either in machine direction or in transverse direction is not less than 300% and less than 800% and the product of the draw ratios in both the directions is not less than 900% and less than 5.000%, and, after that, heat-treated so as to produce low shrink polyethylene-based biaxially oriented film. In this case, its orienting temperature conditions are set to stisfy the following numerical formula (n1) and (n2) and its heat treating temperature condition is set to satisfy the following numerical formula (n3):(n1)...Tm-30 deg.C<=T1<= Tm-10 deg.C, (n2)...Tm-50 deg.C<=T2<=Tn-25 deg.C, (n3)...Tm-40 deg.C<=T3<=Tm, in which T1 represents the lengthwise orienting temperature, T2 represents the crosswise orienting temperature and T3 represents the heat treating temperature.
Inventors:
Gunji Hayashi
Mitsukazu Yui
Tetsuya Kubota
Mitsukazu Yui
Tetsuya Kubota
Application Number:
JP17758691A
Publication Date:
April 10, 2000
Filing Date:
June 21, 1991
Export Citation:
Assignee:
Mitsubishi Chemical Corporation
International Classes:
B29C47/00; B29C55/14; B29C71/02; B29K23/00; B29K105/02; B29L7/00; (IPC1-7): B29C55/14
Domestic Patent References:
| JP5890924A | ||||
| JP493225A | ||||
| JP59215828A |
Attorney, Agent or Firm:
Kazuhiko Okada