Abstract: A heat-insulating paper container has a body member and a bottom panel member. Part of the outer surface of the body member is coated with a paint containing 5 wt %-40 wt % of a synthetic resin component so that the foaming of a thermoplastic synthetic resin film is suppressed in that area. The remainder of the body member which has not been coated with the resin component containing paint forms a foamed heat-insulating layer of the thermoplastic resin film.

Abstract: A heat-insulating paper container comprising a body member and a bottom panel member, part of the outer surface of said body member being provided with printing of an organic solvent based ink, wherein a thick foamed heat-insulating layer that is made of a thermoplastic synthetic resin film is formed in the printed area of said outer surface whereas a less thick foamed heat-insulating layer that is made of the same thermoplastic synthetic resin film is formed in the non-printed area of said outer surface. If desired, part of the thermoplastic synthetic resin film may be adapted to remain totally unfoamed.

Abstract: A method for producing two-piece paper containers having waterproofness, water repellency, permeability and good stiffness without using any adhesive. A container body wall member and a container bottom panel member are blanked out from a base paper made from a stock containing about 10 to about 80% by weight of high-density polyethylene synthetic pulp. The blanked members are fabricated into a container using a conventional cup-making machine without using any adhesive. Then, the so-fabricated containers are heated at a temperature between about 120.degree. C. and about 300.degree. C. for a short period of time.

Abstract: A heat-insulating paper container having good heat-insulating property which can be prepared easily at low cost is disclosed. The paper container is prepared by heating a paper container comprising a body member and a bottom member, wherein one surface of at least the container body member is coated or laminated with a thermoplastic synthetic resin film and the other surface of the body member is coated or laminated with the same or different thermoplastic synthetic resin film or an aluminum foil, to thereby foam the thermoplastic synthetic resin film and form a heat-insulating layer on at least one surface of the container.

Abstract: A process for producing a paper container having high impermeability to liquid comprising spray coating a polymerizable solution containing a prepolymer, photosensitizer and/or reactive diluent onto a wall surface of previously fabricated paper containers, allowing the prepolymer and/or reactive diluent to polymerize by an ultraviolet irradiation to thereby form a liquid impermeable coating on the wall surface of the container.

Abstract: A method for economically manufacturing a water-resistant paper container having a thermoplastic film coating on the inner and/or outer wall surfaces by means of an ultrasonic wave welding technique. The paper container can be economically manufactured by the utilization of an ultrasonic wave welding technique without the use of any adhesive. According to the method of the present invention, a bottom panel and a body member can be interruptedly joined together at the interface between the panel and the container body. As a result, the inner wall surface of the container can be easily and rapidly lined with a thermoplastic film by a known method. Furthermore, according to the present invention, a container mouth edge which is capable of resisting to any deforming stress can be formed.