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Method and apparatus for spin welding container closures

  • US 6,296,726 B1
  • Filed: 06/13/2000
  • Issued: 10/02/2001
  • Est. Priority Date: 06/13/2000
  • Status: Expired due to Term
First Claim
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1. The method of making sealed synthetic resin containers comprising:

  • (a) molding thermoplastic synthetic resin into bowls and lids therefor, said lid and bowl having substantially complimentary mating surfaces extending about the periphery thereof;

    (b) filling one of said bowls with product;

    (c) bringing opposed, generally horizontal mating surfaces of said lid and bowl into contact under a predetermined axial pressure while gripping said product filled bowl and lid securely;

    (d) rapidly accelerating rotation of said lid relative to said bowl while maintaining substantially said axial pressure to produce melting of said mating surfaces until a desired torque value is attained; and

    (e) then immediately decelerating said rotation of said lid to terminate said rotation and allow said mating surfaces to bond.

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