Method and apparatus for forming thermoplastic containers

Details Method and apparatus for forming thermoplastic containers Method and apparatus for forming thermoplastic containers

1974-06-14

1976-07-20

Whitby, Edward G.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 69, 156187, 156189, 156194, 156198, 156215, 156218, 156277, 156285, 156304, 156322, 156446, 156497, 264230, 264342R, B29C 2728

Patent

active

039704920

ABSTRACT:
A sleeve forming method wherein a rectangular sheet of thermoplastic material is formed into a tubular shape having overlapped end portions that are sealed together by directing heated air between the end portions to soften their facing surface and pressing the end portions together to form a seam. The seam preferably is liquid-tight, so that the sleeve may be utilized to form the sidewall of a cup or nestable container wherein the sleeve is heat-shrunk about a generally frusto-conically shaped mandrel to give the container sidewall its desired shape. A two-piece container can be formed by sealing a bottom disc member to the end of the sidewall, and a one-piece container can be formed by collapsing and fusing the end of the sidewall sleeve to close the bottom of the container.

REFERENCES:
patent: 3344222 (1967-09-01), Shapiro et al.
patent: 3380229 (1968-04-01), Nelson
patent: 3562920 (1971-02-01), Vuilleumier et al
patent: 3658615 (1972-04-01), Amberg
patent: 3666162 (1972-05-01), Tiffin et al.
patent: 3767496 (1973-10-01), Amberg et al.

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