METHOD AND APPARATUS FOR PRODUCING ELONGATE DRAWN FILM

WIPO Patent Application WO/2013/145574

A1

The present invention relates to a method for producing an elongate drawn film, the method comprising at least: a step in which an elongate film containing a thermoplastic resin is produced, an oblique drawing step in which the elongate film is obliquely drawn, and a step in which the elongate drawn film is wound after the oblique drawing step, wherein the oblique drawing step is performed inside a heating zone comprising a preheating zone, a drawing zone and a heat-fixing zone. The preheating zone and the drawing zone, and the drawing zone and the heat-fixing zone are each divided by means of partition walls, at least one of the partition walls has a curved section in at least one location in the widthwise direction, and the angle of curvature of said partition wall is adjusted in accordance with the travel position of the elongate film.

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HATAKEYAMA SHIMPEI (JP)
HOJO DAISUKE (JP)
INAGAKI SHINJI (JP)
NANBU HIROSHI (JP)
UENO DAISUKE (JP)

PCT/JP2013/001407

October 03, 2013

March 06, 2013

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KONICA MINOLTA INC (JP)

B29C55/04; B29L7/00; B29L11/00; G02B5/30

JP2007175974A	2007-07-12
JP2006159775A	2006-06-22
JP2004230714A	2004-08-19
JP5177332B1	2013-04-03

KOTANI, Etsuji et al. (JP)
Etsuji Kotani (JP)

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