Twin sheet thermformed structure and method of making same

Details Twin sheet thermformed structure and method of making same Twin sheet thermformed structure and method of making same

1993-10-08

1995-04-18

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 5110

Patent

active

054076323

ABSTRACT:
In producing a twin sheet thermoformed structure, a mold is provided with major rib producing structures segregrated into discrete tabs with gaps between tabs. A first sheet of material is fused upon itself by drawing the material into the gaps between tabs from both sides of the gap. The material drawn into the gaps fuses upon contact with material being drawn into the gap from the other side forming a cross rib which tends to stabilize the side walls of the major rib. The first sheet is then fused to a second sheet of material to create a twin sheet structure.

REFERENCES:
patent: 2991500 (1961-07-01), Hagen
patent: 3444034 (1969-05-01), Hewett
patent: 3444034 (1969-05-01), Hewett
patent: 3467741 (1969-09-01), Kesling
patent: 3736201 (1973-05-01), Teraoka
patent: 3875280 (1975-04-01), Story
patent: 4016230 (1977-04-01), Michel
patent: 4261473 (1981-04-01), Yamada et al.
patent: 4423000 (1983-12-01), Teraoka
patent: 5051084 (1991-09-01), Guarriello et al.

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