Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Starting material is nonhollow planar finite length preform...
Patent
1998-09-14
2000-05-16
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...
264292, 264553, 264554, 425388, B29C 5110
Patent
active
060633263
ABSTRACT:
A method of thermoforming a thin flexible film comprising a series of steps. A thin flexible film capable of being thermoformed is heated until it is pliable. A mold having first and second surfaces on different planes forms a thermoformed article having a contoured surface. A first portion of the pliable film is contacted with the first surface. A first vacuum is applied through the first surface to draw the first portion against the first surface. After the first portion of the film is drawn against the first surface, a second portion of the film contacts the second surface. A second vacuum is applied through the second surface to draw the second portion of the film against the second surface. Air trapped between the mold and the film is first removed between the first surface and the first portion of the film and then removed from between the second surface and the second portion of said film so that the thermoformed article is substantially defect-free.
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patent: 4123215 (1978-10-01), Madenokoji
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patent: 4975236 (1990-12-01), MacLachlan
Chang Huan-Kun
Homburg Frederick J.
Kotha Srinivas
Shafi Noman
Ford Motor Company
Lee Dae Young
Porcari Damian
Silbaugh Jan H.
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