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Thermoformed platform

  • US 20040168618A1
  • Filed: 03/11/2004
  • Published: 09/02/2004
  • Est. Priority Date: 04/11/2000
  • Status: Active Grant
First Claim
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1. A method for improving the bond strength between at least two heat deformed thermoplastic sheets forming a unitary structure, the method comprising:

  • extruding a continuous web of thermoplastic having a top surface and a bottom surface;

    conveying the continuous web of thermoplastic through a down-stream work station scuffing the top surface, wherein the top surface is characterized having increased surface area relative the bottom surface;

    shearing the continuous web of thermoplastic providing a plurality of sheets having scuffed top surfaces;

    thermoforming simultaneously at least a first sheet over a first mold and a second sheet over a second mold upon a machine frame; and

    compressing a heated first sheet against a heated second sheet between the first mold and the second mold upon the machine frame to bond the scuffed top surface of the first sheet to the smooth surface of the second sheet.

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