Method of making nestable foamed plastic cups

Details Method of making nestable foamed plastic cups Method of making nestable foamed plastic cups

1973-12-26

1976-01-06

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

156245, 229 15B, 264 454, 264 461, 264 53, 264248, 264321, B29D 2700

Patent

active

039313808

ABSTRACT:
Cups having a sidewall made from foam sheet plastic with a fusion sealed, lapped seam, wherein the lapped seam and the sidewall immediately adjacent the lapped seam are of identical thickness, are provided with additional rigidity per unit wall thickness by compressing the foam sheet either in-line with the foam extrusion operation or up to several months after extrusion. The cup is characterized by a substantial skin on only the outer surface of the sidewall.

REFERENCES:
patent: 3311681 (1967-03-01), Cherney et al.
patent: 3454208 (1969-07-01), Amberg et al.
patent: 3658615 (1972-04-01), Amberg
patent: 3666162 (1972-05-01), Tiffin et al.
patent: 3673033 (1972-06-01), MacDaniel et al.

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