Abstract: There is provided a parison guide which improves a flatness of parison with a simple configuration. A parison guide (1) guides a parison (P) which has an arc shape in horizontal cross section and is discharged from an extrusion apparatus (2). The parison guide is fixed to a discharge-side end portion of the extrusion apparatus (2). The parison guide includes a contact face (17) configured to come into contact with and guide an edge portion of the parison to flatten the parison. Preferably, the contact face (17) includes a curved surface, and the contact face (17) has a curvature of a horizontal cross section which gets smaller in a discharge direction.

Abstract: There is provided a parison guide which improves a flatness of parison with a simple configuration. A parison guide (1) guides a parison (P) which has an arc shape in horizontal cross section and is discharged from an extrusion apparatus (2). The parison guide is fixed to a discharge-side end portion of the extrusion apparatus (2). The parison guide includes a contact face (17) configured to come into contact with and guide an edge portion of the parison to flatten the parison. Preferably, the contact face (17) includes a curved surface, and the contact face (17) has a curvature of a horizontal cross section which gets smaller in a discharge direction.

Abstract: The present invention provides a molding machine crosshead which uses one additional resin extruder and one base resin extruder that are connected to one annular flow channel of a crosshead unit at mutually different angular positions and which is configured to form a parison by adding an additional layer constituted by an additional resin from the additional resin extruder to a base layer constituted by a base resin supplied from the base resin extruder into the annular flow channel, the additional resin being a material different from the base resin, wherein the additional resin is formed in a linear shape along the longitudinal direction of the parison as part of the parison.