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Tamper Resistant Container with Locking Rim

  • US 20110239597A1
  • Filed: 06/15/2011
  • Published: 10/06/2011
  • Est. Priority Date: 10/18/2007
  • Status: Abandoned Application
First Claim
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1. A method of permanently attaching a plastic lid to a plastic can, comprising:

  • providing a plastic lid having a bottom portion, said bottom portion having an inner skirt having an outer surface and an outer skirt having an inner surface;

    providing a plastic can having an inner wall and an outer wall;

    providing said can outer wall with a circumferential can bead and a circumferential can groove;

    providing said can inner wall with an upper circumferential portion having a lower end wherein said upper circumferential portion projects slightly inward such that the lower end of said inwardly projecting upper circumferential portion defines a slight step on the inner surface of the can inner wall;

    providing said lid outer skirt with a circumferential outer skirt bead projecting inwardly from said inner surface;

    providing said lid inner skirt with a circumferential inner skirt bead projecting from said outer surface;

    pressing said lid onto said can so that the outer skirt bead mates with the can groove, the can bead contacts the inner wall of the lid outer skirt, and the inner skirt bead contacts the can inner wall; and

    ultrasonically scan welding the lid to the can to weld the inner can wall to the inner skirt bead.

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