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Interfolding method of sheet material not or not enough permeable to air and machine for carrying out such method

  • US 6,213,927 B1
  • Filed: 08/19/1999
  • Issued: 04/10/2001
  • Est. Priority Date: 08/21/1998
  • Status: Expired due to Term
First Claim
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1. A method for production of interfolded stacks formed by a plurality of sheets comprising the steps of:

  • transversally separating said plurality of sheets, obtained from at least one web, offset with respect to one another so that a sequence of offset sheets is created, where each of said separated sheets has a first end and a second end;

    puncturing each of said separated sheets with puncturing means at a location between said first and second ends to render said separated sheets permeable to air;

    passing said separated sheets onto folding rollers which comprise sucking means for the alternate holding of said sheets in order to obtain an interfolded disposition;

    formation of a continuous interfolded stack downstream of said folding rollers.

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