Title:
ポリプロピレン系縦一軸延伸フィルムの製造方法
Document Type and Number:
Japanese Patent JP7273564
Kind Code:
B2
Abstract:
To provide a new method for manufacturing the polypropylene system vertically uniaxial stretched film, that maintains good tearability of the film itself, has a uniform film thickness, is excellent in strength, and suppresses a rise in a heat seal temperature.SOLUTION: A film in which difference between maximum thickness and minimum thickness in film thickness is within 20% of average thickness is obtained by setting a melt flow rate (MFR) of polypropylene resin to 1 to 10 g/10 min, melt-extruding a raw material, molding into a sheet with a cooling roll, adjusting crystallinity to 55% or less, and next, uniaxially stretching at a stretch ratio of 1.2 to 3.5 times in a longitudinal direction with a difference in roll speed to form a stretched film, wherein the raw material is a resin composition containing 70 wt% or more of polypropylene system resin that is an isotactic polypropylene that is either a propylene homopolymer, or a random copolymer or a block copolymer obtained by polymerizing propylene and α-olefin other than propylene.SELECTED DRAWING: Figure 1
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Inventors:
Kanako Makita
Hiroshi Slowly
Kazuyuki Okada
Hiroshi Slowly
Kazuyuki Okada
Application Number:
JP2019050900A
Publication Date:
May 15, 2023
Filing Date:
March 19, 2019
Export Citation:
Assignee:
Futamura Chemical Co., Ltd.
International Classes:
B29C55/06; B29C48/08; B29C48/16; B29C48/305; B29C48/88; B32B27/32
Domestic Patent References:
| JP11179800A | ||||
| JP201632911A |
Attorney, Agent or Firm:
Daiki Kato
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