Apparatus for manufacturing foam plastic containers by use of a

Details Apparatus for manufacturing foam plastic containers by use of a Apparatus for manufacturing foam plastic containers by use of a

1982-07-06

1985-12-24

Coan, James E.

Package making

Apparatus for contraction of cover by stretching or shrinking

By heat shrinking

493109, B65B 4308, B65B 302

Patent

active

045597650

ABSTRACT:
The present invention is directed to an apparatus and method wherein preprinted rectangular blanks of longitudinally stretch-oriented foam sheet material are continuously formed into cylinders by a tubular forming mandrel on which the blanks are folded, seamed and thereafter transferred onto final forming mandrels. Subsequently, the blanks and the final mandrels are heated to shrink the blanks so that they assume the shape of the final forming mandrels. In forming containers, means are provided to place bottom blanks on the product mandrels prior to the loading of the cylinders thereon so as to shrink the cylinders to sidewall shapes overlying the bottom blanks. The top curl on containers such as drinking cups and food tubs is formed after shrink forming. Further, the bottom seam of the container may be reinforced by ironing after shrink forming.

REFERENCES:
patent: 4121402 (1978-10-01), Cress et al.
patent: 4365460 (1982-12-01), Cress et al.

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