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Method and apparatus for heating steel sheet

  • US 10,455,648 B2
  • Filed: 07/25/2012
  • Issued: 10/22/2019
  • Est. Priority Date: 07/28/2011
  • Status: Active Grant
First Claim
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1. A method for heating a steel sheet, the method comprising:

  • heating a continuously traveling steel sheet;

    generating wrinkle in a widthwise central portion of the steel sheet by pre-heating the steel sheet before heating the continuously traveling steel sheet; and

    spreading the wrinkle up to a widthwise edge portion of the sheet by thereafter enlarging a heating zone.

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