Patent ID: 7556762

Claim:
A method of inflation extrusion molding, comprising: introducing one or more resin materials extruded from one or more extruders into a die; subsequently extruding the resin material(s) from the die and inflating the extrudate into a cylindrical shape having a predetermined diameter by blown-film extrusion; and then passing the cylindrical inflated resin material through a space between stabilizers which face each other at a predetermined angle, to deform the cylindrical resin material into a flat tube shape having an elongated elliptic section, thereby producing a film or sheet having a predetermined width, wherein the deformation of the cylindrical inflated resin material into a flat tube shape having an elongated elliptic section is assisted by a guide device to thereby facilitate the deformation, wherein the stabilizers each comprise roller members arranged in rows and the roller members each are arranged so that the direction of rotation thereof is substantially the same as the direction in which the cylindrical inflated resin material is spread when deformed into a flat tube shape having an elongated elliptic section, to thereby serve as the guide device, and wherein each roller member contains rollers disposed to form a zigzag configuration with the rollers in the other roller members.