Patent ID: 6536190
Filing Date: 2003-03-25
Classification: B65B,B65D

Abstract:
A method of forming a closed multi-wall sack having an inner bag and an outer bag which encloses the inner bag and has block ends, the method comprising the following steps at the completion of filling a product into the sack through an open end of the sack:(i) sealing the product in the inner bag; (ii) opening out the sides of the outer bag at the open end of the sack to form outturned side flaps and inturned triangular wings; (iii) folding inwardly an outer section of one of the flaps onto the inner section of the flap; (iv) folding inwardly an outer section of the other flap onto the inner section of the flap and to overlap partially the folded flap so that the outer bag forms a block end; and (v) adhering or otherwise holding together the block end.