초록 ▼

Apparatus is provided for straightening a parison tube (58b) in an apparatus of the type in which thermoplastic tubing (48) is extruded into open halves (24 and 26) of a blow mold (22) and a parison tube (58b) is severed from the thermoplastic tube (48) concurrently with the blow mold being rotated

Apparatus is provided for straightening a parison tube (58b) in an apparatus of the type in which thermoplastic tubing (48) is extruded into open halves (24 and 26) of a blow mold (22) and a parison tube (58b) is severed from the thermoplastic tube (48) concurrently with the blow mold being rotated around an axis (28). The present invention orients the curvature of the parison (58b) in a predetermined plane (52) by accelerating the parison tube (58b) transversely to the axis (90) of the parison tube (58b); and then the parison tube (58b) is straightened by applying jets of air (76) against the neck and moil portion (68) of the parison tube (58b), thereby straightening the parison tube (58b), and thereby preventing the neck and moil portion (68) of the parison tube (58b) from being pinched between the mold halves (24 and 26) in the area of the neck and moil cavity (38).

대표청구항 ▼

Apparatus for producing thermoplastic containers, which apparatus comprises: extruding means, comprising a crosshead, for extruding thermoplastic tubing along a first axis that lies in a first plane; severing means for severing a parison tube from said thermoplastic tubing that includes a first end,

Apparatus for producing thermoplastic containers, which apparatus comprises: extruding means, comprising a crosshead, for extruding thermoplastic tubing along a first axis that lies in a first plane; severing means for severing a parison tube from said thermoplastic tubing that includes a first end, a first holding portion, a first body portion, and a neck and moil portion; blow mold means, comprising a blow mold having first and second mold halves, having a first holding cavity, and a first body cavity, and having a neck and moil cavity, for opening and closing said cavities by relative movement of said mold halves along a second axis that is substantially orthogonal to said first axis and that is substantially orthogonal to said first plane, for grasping said first holding portion of said parison tube in said first holding cavity, for enclosing said first body portion in said body cavity, for enclosing said neck and moil portion in said neck and moil cavity, and for blow forming a first container; actuating means, for actuating said halves of said blow mold to an open position wherein said blow mold receives said parison tube, to intermediate positions wherein said first holding cavity grasps said first holding portion of said parison tube, and to a closed position; and means for applying a transverse force to said parison tube for straigtening said parison tube prior to completion of said closing of said blow mold.