Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Starting material is nonhollow planar finite length preform...
Patent
1997-10-20
1999-05-18
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Starting material is nonhollow planar finite length preform...
264153, 264156, 264553, 4253021, B29C51/02;51/44
Patent
active
059048913
ABSTRACT:
A photo film cassette includes a spool core (4), on which the photo film is wound in a form of roll. A cassette shell (2a, 2b) contain the spool core in rotatable fashion. First and second disks (6a, 6b) are respectively provided with bearing holes (5) formed in a middle thereof, and respectively secured to ends of the spool core, for regulating positions of sides of the roll. A ring-like lip (11) is formed integrally with a periphery of the first disk, projected toward the roll, contacted on one edge of an outermost turn of the roll, and prevents the roll from being loosened. In a disk producing method, a sheet (21) of thermoplastic resin is heated and softened. Pressurization and/or suction is applied to the heated sheet to fit the sheet on a mold (23d), so as to form a pattern (19, 31, 58, 60) on the sheet. The pattern includes first and second groups of disk-like portions (19) and positioning portions (31, 58, 60) associated with the disk-like portions. The disk-like portions of the first group are cut out of the sheet with the pattern while the sheet is positioned by the positioning portions, to produce the first disk. The disk-like portions of the second group are cut out of the sheet with the pattern while the sheet is positioned by the positioning portions, to produce more of the first disk.
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Eashoo Mark
Fuji Photo Film Co. , Ltd.
Silbaugh Jan H.
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