Method for forming holes in thermoformed articles

Details Method for forming holes in thermoformed articles Method for forming holes in thermoformed articles

1979-01-24

1980-10-28

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...

264154, B29C 1704, B29C 1708

Patent

active

042306620

ABSTRACT:
A method and apparatus for thermoforming articles from plastic sheet material and for forming holes in the thermoformed articles in a single operation involves heating the material and vacuum drawing the heated material into a mold cavity which has an aperture corresponding in shape to the desired hole. The underside of the mold cavity is tapered outwardly away from the aperture, and, as the sheet material is drawn into the cavity, it follows the taper, is thinned, and is trapped in the cavity. The hole in the article is created when the sheet material not drawn into the cavity is stripped from the mold.

REFERENCES:
patent: 3038198 (1962-06-01), Schaar
patent: 3163686 (1964-12-01), Pusel et al.
patent: 3172927 (1965-03-01), Mosonnier
patent: 3187380 (1965-06-01), Harrison
patent: 3375551 (1968-04-01), Sherlock
patent: 3381068 (1968-04-01), Leiper et al.
patent: 3555652 (1971-01-01), Ignell

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