Patent ID: 8585946

Claim:
A method for making heat-insulated paper containers by coating a surface of paper with a film layer, and then continuously coating another surface of the paper with a foam material in a manner of spraying, rolling or color printing, and then furling the paper after drying, and after that, cutting the paper into a semi-product and then molding into a paper container; wherein the method comprising: mixing and blending polyethylene terephthalate or polypropylene with an adhesive to form a polymer material; heating and extruding the polymer material with an extruder machine to form a film; coating a surface of paper with the film so as to form as the film layer which is to be an inner surface of the paper container; cooling and laminating the paper, which is coated with the film, with a laminating roller; instantaneously heating the foam material on an outer surface of the paper container with a heating device in a manner of directly touching the foam material with the heating device or disposing the heating device closely to the foam material, so that the foaming time of the foam material is shortened, the foam material foams uniformly, and the film layer is prevented from being damaged by high temperature when heating.