Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Starting material is nonhollow planar finite length preform...
Patent
1993-12-28
1995-06-27
Timm, Catherine
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Starting material is nonhollow planar finite length preform...
425388, B29C 5106, B29C 5110
Patent
active
054277329
ABSTRACT:
A method of utilizing a male mold and a complementary female mold to thermoform first and second plastic sheets and thereafter fuse the sheets together to form a twin sheet plastic article. The female mold is moved upwardly into sealing engagement with the underside of the first plastic sheet to form an annular seal with the first plastic sheet; a bubble is formed in the first plastic sheet within the annular seal; the male mold is lowered into the bubble to move the bubble into general conformity with the cavity surface; the male mold is raised; a vacuum is applied to the cavity surface to conform the bubble totally to the cavity surface; a second plastic sheet is positioned between the molds; a pre-draw box is positioned between the second plastic sheet and the female mold and moved upwardly into sealing engagement with the underside of the second plastic sheet to form an annular seal with the second plastic sheet; a bubble is formed in the second plastic sheet within the annular seal; the male mold is moved downwardly into the bubble to generally conform the bubble to the male mold surface; a vacuum is applied to the male mold surface to conform the bubble totally to the male mold surface; the pre-draw box is removed; and the molds are brought together to selectively fuse the first plastic sheet to the second plastic sheet to form the twin sheet plastic article.
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