Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Starting material is nonhollow planar finite length preform...
Patent
1987-07-13
1989-07-11
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...
264553, 425388, 425403, B29C 5110
Patent
active
048470341
ABSTRACT:
Vacuum forming method and apparatus in which a thermoplastic sheet material is pushed, by at least one plug, into a recess formed in a female mold, and evacuation is applied to the recess to bring the sheet material into intimate contact with a wall surface of the recess. At least one of the female mold and the plug is moved in a first direction in which the plug and a bottom of the recess relatively move toward each other. At least one of the female mold and the plug is moved in a second direction substantially perpendicular to the first direction, in which second direction the plug and a peripheral edge of the recess relatively move toward each other.
REFERENCES:
patent: 2937403 (1960-05-01), Keith
patent: 3781394 (1973-12-01), Houghton
patent: 3873659 (1975-03-01), Smith
patent: 3975493 (1976-08-01), Tigner et al.
patent: 4288401 (1981-09-01), Keith et al.
patent: 4480979 (1984-11-01), Keith et al.
Araki Kazuo
Fukushima Hisao
Kobayashi Yoshio
Matsumoto Seiji
Heitbrink Jill L.
Shigeru Kogyo Kabushiki Kaisha
Silbaugh Jan H.
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