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Inertial spin welding of thermoplastic and thermoplastic coated container parts

  • US 4,584,037 A
  • Filed: 02/09/1983
  • Issued: 04/22/1986
  • Est. Priority Date: 09/07/1982
  • Status: Expired due to Term
First Claim
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1. A method of inertial spinwelding of a thermoplastic container bottom having an axially extending peripheral surface receivable with a press fit within one end of an open-ended cylindrical container body, said method comprising:

  • releasably mounting a thermoplastic container bottom having an axially projecting peripheral flange member adapted for tight-fitting engagement in a cylindrical body member, and an open-ended cylindrical paperboard container body, on axially aligned, opposed mandrels, at least one of which is rotatable mandrel;

    temporarily engaging said rotatable mandrel with a rotary drive to bring it up to a predetermined rotational speed;

    disengaging said rotary drive and allowing said rotating mandrel to continue rotating; and

    ,moving the two mandrels axially toward each other while said mandrel is rotating, and seating said bottom in one end of said body, thereby spinwelding said bottom into said body;

    wherein the mounting of said body on its mandrel further comprises the steps of radially contracting expandable and contractable body engaging means on said mandrel, locating the body over said body engaging means, and radially expanding the inserted body engaging means to conform the interior surface of said body to a cylindrical surface of a predetermined desirable diameter.

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