Patent ID: 6093460
Filing Date: 2000-07-25
Classification: B31B,B31F,B32B,B65D,Y10S,Y10T

Abstract:
A paper receptacle formed only by press-forming a sheet of paperboard material, wherein said paperboard material has a multi-layered structure including,a paperboard having a weight of 200 to 450 g/m.sup.2, a density of 0.65 to 0.82, and a gas permeability of 50 to 200 sec determined by measuring an average amount of time required to pass 100 ml of air through an area of 645 mm.sup.2 in the paperboard,a first resin layer formed on the entire front surface of said paperboard and having liquid-impermeability and thermal resistance, anda second resin layer formed on the entire back surface of said paperboard and having permeability to air and liquid.