Apparatus and method for sealing box blanks

  • US 4,979,932 A
  • Filed: 03/02/1989
  • Issued: 12/25/1990
  • Est. Priority Date: 03/02/1989
  • Status: Expired due to Term
First Claim
Patent Images

1. In a paper box folding and gluing apparatus for sealing the flaps of a blank to form a box with sealed seams by overlapping portions of first and second edge sections on a blank including means for storing and feeding blanks onto a conveyor means for transport to different operating zones in said machine, the box having a heat-activated sealing material at least at said first and second edge sections, said apparatus comprising:

  • A. skiving zone means for removing a first portion of the first edge section to produce a skived edge portion,B. hemming zone means for folding an end section of the skived edge section over a second, adjacent section thereby to form a hem at the first edge section,C. means for activating the sealing material at said first and second edge sections,D. means for overlapping portions the first and second edge sections including the hem,E. hem holder means at said overlapping means for directing heated air toward the skived edge portion for forcing the skived edge portion toward the first edge section thereby to maintain the skived edge sections in a hem configuration, andF. sealing means for thereafter pressing the overlapped portions together hereby to form a seal with the skived edge portion intermediate the first and second edge sections.

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