Process for producing container for photographic film

Details Process for producing container for photographic film Process for producing container for photographic film

1993-11-05

1995-10-24

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Forming plural articles

2643288, 26432813, 26432815, 425549, 425588, B29C 4574, B29C 4577

Patent

active

054607680

ABSTRACT:
A process for producing a container is disclosed including molding the container using an injection molding machine with a multicavity mold having not less than 12 cavities by charging a hot runner thermoplastic resin having a melt flow rate of 5 to 80 g/10 minutes to the multicavity mold, wherein not less than 70% of the total injected resin amount at each shot is injected at an injection speed which is adjusted at 150 to 270 mm/sec., and the remaining resin at each shot is injected at a final injection speed which is adjusted at 3 to 90 mm/sec. By employing the process, molding troubles such as burrs, stringiness, short shot and weld lines do not occur, and the container can be molded continuously for a long period under unmanned conditions without screening inspection.

REFERENCES:
patent: 3632246 (1972-01-01), Ichikawa et al.
patent: 3941534 (1976-03-01), Hunkar
patent: 4345890 (1982-08-01), Hemmi et al.
patent: 4639386 (1987-01-01), Akao
patent: 4921737 (1990-05-01), Akao
patent: 5084316 (1992-01-01), Akao
patent: 5178805 (1993-01-01), Yokota
Patent Abstracts of Japan, vol. 8, No. 76 (M-288)9, Apr. 1984 JP-A-58 222 830 (Sumitomo Jukukai Kogyo K.K.) 24 Dec. 1983.
Database WPI, Week 9236, Derwent Publications, Ltd., London, GB; AN 92-296544 JP-A-4 205 827 (Japan Synthetic Rubber Co., Ltd.) 28 Jul. 1992.
Database WPI, Week 8435, Derwent Publications, Ltd., London, GB; AN 84-216045 JP-A-59 125 632 (Matsushita Electric Works) 20 Jul. 1984.

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