Apparatus and method of producing multiple corrugations simultaneously

  • US 3,340,719 A
  • Filed: 10/28/1964
  • Issued: 09/12/1967
  • Est. Priority Date: 10/28/1964
  • Status: Expired due to Term
First Claim
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1. A METHOD OF FORMING A PLURALITY OF CORRUGATIONS SIMULTANEOUSLY IN A METALLIC SHEET, COMPRISING LAYING THE SHEET OVER A MEMBER CONTAINING A PLURALITY OF FEMALE DIES HAVING CAVITIES OF DESIRED CONFIGURATIONS, APPLYING A PREGATHERING FORCE UPON THE SHEET SUFFICIENT ONLY TO PRODUCE A WAVE FORM THEREIN WHOSE TROUGHS EXTEND INTO THE DIE CAVITIES WITHOUT EXCEEDING THE ELASTIC LIMIT OF THE SHEET, AND THEN APPLYING A PLURALITY OF MALE DIES CORRESPONDING TO THE FEMALE DIES SIMULTANEOUSLY TO THE SHEET WITH A FORCE SUFFICIENT TO MOLD THE SAME IN THE FEMALE DIE CAVITIES TO THEREBY MINIMIZE OVERALL SHRINKAGE OF THE CORRUGATED SHEET.

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