Patent ID: 6068585
Filing Date: 2000-05-30
Classification: B31B,B65D,Y10S

Abstract:
A method for continuously producing a gored packing bag which comprises the steps of:providing first and second belt-shaped thermoplastic resin sheets, each of said resin sheets having a film of a higher fusion temperature resin and a film of a lower fusion temperature resin;providing a gore sheet having a film of said higher fusion temperature resin and a film of said lower fusion temperature resin;providing a pair of fastener tapes comprising a first fastener tape and a second fastener tape;folding said gore sheet on two sides such that two side ends of said gore sheet meet along a center line of said gore sheet keeping said lower fusion temperature resin film outside;setting said gore sheet and said first fastener tape in order on one side of said first belt-shaped thermoplastic resin sheet keeping said lower fusion temperature resin film facing up, followed by welding said first belt-shaped resin sheet, said gore sheet and said first fastener tape along the extension of said first fastener tape;setting said second fastener tape on said second belt-shaped thermoplastic resin sheet keeping said lower fusion temperature resin film face down, so that said first fastener tape and said second fastener tape are arranged in a mirror image manner, followed by welding said second belt-shaped thermoplastic resin sheet and said second fastener tape along the extention of said fastener tape, this step being conducted simultaneously with the preceding step;setting said second belt-shaped thermoplastic resin sheet on said first belt-shaped thermoplastic resin sheet so that said first fastener tape and said second fastener tape face each other, followed by thermally welding along said side edges of said gore sheet and a bottom edge of said gored packing bag.