Abstract: Apparatus for producing a hollow molded synthetic resin article includes a split mold having an inner molding surface with a contour conforming to the configuration of the desired article, a space between the opposing mold members of the split mold for receiving a heated parison of a thermoplastic synthetic resin in the form of a tube or two parallel-laid sheets, vacuum suction holes provided in the molding surface and the parting surfaces of the split mold, means for opening and closing the split mold, means for applying negative pressure to the vacuum suction holes, and means for blowing heated compressed air against the inside surface of that portion of the parison which corresponds to the parting surfaces in the direction facing the parting surfaces. The attachment of the parison to the parting surfaces is thereby facilitated.

Abstract: A method for producing a hollow synthetic resin article, which comprises opening a split mold having an inner molding surface with a contour conforming to the configuration of the desired article, feeding a heated molding material of a thermoplastic synthetic resin in the form of a tube or two parallel-laid sheets into a space between the opposing mold members of the split mold, applying a negative pressure to vacuum suction holes provided in the molding surfaced and the parting surfaces of the split mold to vacuum-form the molding material, and while the negative pressure is being applied or after the application of the negative pressure is stopped, closing the mold to form the molding material into the final desired configuration.