Disk producing method and apparatus

Details Disk producing method and apparatus Disk producing method and apparatus

1999-06-29

2000-10-24

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264555, 264571, 264153, 264163, 264155, 425295, 4253021, B29C 5108

Patent

active

061362611

ABSTRACT:
A photo film cassette includes a spool core (13) on which photo film is wound in a form of a roll. A cassette shell (3, 4) contains the spool core in rotatable fashion. In each of a pair of disks (16, 17), a bearing hole (16a, 17a) is formed. The disks are secured to first and second ends of the spool core, and regulate edges of the photo film. To produce at least one kind of disk, a continuous sheet (27, 78, 88, 162, 171, 215) of thermoplastic synthetic resin is partially masked with a mask plate (48, 87, 160, 161, 170). A portion of the sheet emerging out of the mask plate is heated at temperature higher than a softening point of the sheet. The emerging portion is subjected to vacuum/air-pressure forming, so as to form a disk-like portion (20) in the sheet. The bearing hole and a contour of the disks is cut in the disk-like portion, to produce the disks.

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