Patent ID: 6312368
Filing Date: 2001-11-06
Classification: B31B,B65D

Abstract:
A method of manufacturing a carton, said carton having a base and a side wall, said base and side wall being formed from a base blank and a side wall blank of card having a PET coating thereon which melts on heating, the method comprising the steps forming said base blank into said base by forming a flange around the periphery of said base to which said side wall may be adhered to form the carton, heating regions proximate edges of said side wall blank subjecting said regions to a blast of air at a temperature sufficient to melt said coating in said regions, subsequently forming said side wall blank into said side wall by disposing said side wall blank around a mandrel whereon said flange of said base is brought into contact with said side wall and opposite edges of said side wall blank are overlapped, wherein the coating is melted in regions proximate a pair of adjacent edges of the said side wall blank by directing blasts of air towards said edges at angles .theta..degree. where .theta..degree. is acute to adhere both the overlapped said wall blank edges and the flange of the base to the side wall, the coating being substantially unimpaired above the base internally of the carton.