実質的一軸配向を有する横断方向延伸フィルムを製造するためのプロセスおよび装置

Title:

実質的一軸配向を有する横断方向延伸フィルムを製造するためのプロセスおよび装置

Document Type and Number:

Japanese Patent JP2004528206

Kind Code:

A

Abstract:

The present invention relates to a method of processing a film, the method comprising conveying a film (40) within a stretcher (30') along a machine direction while holding opposing edge portions of the film, and stretching the film to a draw ratio in excess of four within the stretcher by moving the opposing edge portions along diverging, non-linear, coplanar paths (64) to form a stretched film, wherein, during the stretching of the film, the minimum value of the extent of uniaxial character, U, is at least 0.8 over a final portion of the stretching after achieving a TDDR of 2.5 and U is less than 1 at the end of the stretching, wherein U is defined as U = (1/MDDR - 1) / (TDDR 1/2 - 1) wherein MDDR is the machine direction draw ratio corresponding to a divergence angle of the diverging paths and TDDR is the transverse direction draw ratio as measured between the diverging paths.

Inventors:

Jeffrey N. Jackson
William Ward Merrill
Andrew T. Rough
Desiree El Thompson
Dennis El Kruger

Application Number:

JP2002593122A

Publication Date:

September 16, 2004

Filing Date:

May 29, 2002

Export Citation:

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