Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Starting material is nonhollow planar finite length preform...
Patent
1997-12-31
1999-11-30
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...
156292, 264248, 264296, 425504, 425515, B29C 5110
Patent
active
059937246
ABSTRACT:
A first mold is provided having a first molding surface including a flat primary surface area, a plurality of spaced leg areas within the primary surface area, and a plurality of pin holes in the primary surface area positioned between the leg areas; and a second mold is provided having a second molding surface including a flat primary surface area, a plurality of leg areas in the primary surface area corresponding to the leg areas in the primary surface area of the first molding surface, and a plurality of spaced knitting surfaces relieved from the general plain of the primary surface area, positioned between the leg areas, and corresponding to respective pin holes in the primary surface area of the first molding surface. A first plastic sheet is thermoformed to the first molding surface to conform the first plastic sheet to the primary surface area and the leg areas of the first molding surface and position the sheet in overlying relation to the pin holes. A second plastic sheet is thermoformed to the second molding surface to conform the second plastic sheet to the primary surface area, the leg areas, and the knitting areas of the second molding surface. The molds are brought together to bring respective knitting surfaces of the second molding surface into proximity with respective pin holes in the first molding surface and the molds are thereafter pressed together to force plastic material into and fill the pin holes in the first molding surface.
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Lee Dae Young
Shuert Lyle H.
Silbaugh Jan H.
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