Patent ID: 6226964
Filing Date: 2001-05-08
Classification: B31B,B65B,B65D

Abstract:
A method of producing bags from plastic material, comprising the steps of:cutting individual bags from a roll of tubular plastic material by forming cut lines extending transversely across the tubular material at spaced intervals defining a bag length;forming a bottom seam line across the open lower end of each bag length simultaneously with formation of each cut line;setting up each bag so as to form a bag having an inner surface and an external surface, the bag having a sealed lower end having opposite corners and an open upper end providing a filling opening, the filling opening having opposite ends each aligned with a respective corner at the sealed lower end of the bag;pressing the opposite corners at the lower end of the bag downwardly so as to define angular sections across which the lower end seal extends along a central line of each angular section;sealing the angular sections off from the remainder of the bag by forming auxiliary seams extending transversely across the lower end seal;folding each angular section back about the respective auxiliary seam until the angular section lies against the external surface of the bag;filling the bag with a predetermined quantity of a product;forming a top seam across the open upper end of the bag to at least partially close the filling opening;defining angular sections at opposite ends of the filling opening;sealing off each angular section at the upper end of the bag with auxiliary seams extending transversely relative to said top seam; andfolding each angular section at the upper end of the bag back about the respective auxiliary seam so that the angular sections lie against the external surface of the bag.