Patent ID: 6641882
Filing Date: 2003-11-04
Classification: B29C,B29K,B29L,B32B,B65D,Y10T

Abstract:
A packaging bag made using a synthetic resin film as a material, said synthetic resin film comprising a layer constituting an inner surface and a layer constituting an outer surface; peripheries of more than one of said synthetic resin films being heat sealed to form a bag shape in such manner that said inner surfaces are opposed to each other, whereinsaid layer constituting the inner surface comprises a straight chain low-density polyethylene resin and a polybutene-1 resin which are irregularly arranged in a film flow direction to show uniaxial orientation; in a perpendicular direction to the film flow direction, heat sealed surfaces of said resin films have three combinations: a straight chain low-density polyethylene resin and a straight chain low-density polyethylene resin are opposed to each other; a polybutene-1 resin and a polybutene-1 resin are opposed to each other; and a straight chain low-density polyethylene resin and a polybutene-1 resin are opposed to each other; said combinations existing at random; in a parallel direction to the film flow direction, heat sealed surfaces of said resin films extend along the entire length of the film in the film flow direction, said heat sealed surfaces have three combinations: a straight chain low-density polyethylene resin and a straight chain low-density polyethylene resin are opposed to each other; a polybutene-1 resin and a polybutene-1 resin are opposed to each other; and a straight chain low-density polyethylene resin and a polybutene-1 resin are opposed to each other.