Two-piece pleated foam cup

Details Two-piece pleated foam cup Two-piece pleated foam cup

1979-08-03

1981-08-18

Ross, Herbert F.

Envelopes, wrappers, and paperboard boxes

Paperboard box

Box material includes a coating or a nonpaperboard...

229 45, 229DIG4, 229 25R, B65D 306, B65D 328

Patent

active

042842263

ABSTRACT:
A two-piece foam plastic cup is made from a rectangular blank and either a bottom disc or expandible plastic foam beads. The rectangular blank is pleated in triangular transverse pleats having their apices adjacent to the top rim or mouth of the finished cup to form a frusto-conical sidewall blank with a lapped side seam portion. This sidewall blank is placed in a heated mold with either foam plastic beads or a bottom disc and the mold is heated to fuse the pleats, fuse the lapped side seam, and expand the bottom material and sidewall material into a fused unitary cup or container structure having a sidewall of uniform thickness but with visible pleats therein, despite its resulting smooth surface.

REFERENCES:
patent: 1446014 (1923-05-01), Lodge
patent: 1968727 (1934-07-01), Wainwright
patent: 2641402 (1953-06-01), Bruun
patent: 2758771 (1956-08-01), Bauer
patent: 3312383 (1967-04-01), Shapiro
patent: 3315018 (1967-04-01), Commeyras
patent: 3526316 (1970-09-01), Kalogris
patent: 3908523 (1975-09-01), Shikaya

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