Preform for a plastic container, and the preform holder

摘要

The invention concerns a preform for a plastic container in the form of a can intended particularly for pressurized beverages, and the preform holder in the container manufacturing process. The preform (10) consists of a body (1) with a neck (3) ended with a thin outer flange (4). A supporting flange (6) is formed on the inner wall of the neck (3a), while the outer surface of the neck (3b) is even. The preform holder comprises a body (11) provided with pockets (13). The pockets seat mobile-anchored clasps (14) which are clamped on the body (11) with an elastic clamping ring (15). The clasps (14) each ends with a tooth (16) which extends over the seat (17) where the thin outer flange (4) of the preform (10) rests. The inner side wall of the seat (17) has a groove (19) carved in it to accommodate the supporting flange (6) of the preform (10).

主权项

1. A preform for a plastic container comprising of a conically-shaped body with a convex bottom and at an opposite end—merging directly into a cylindrical neck which ends with a top rim having a thin outer flange extended outward away from the conically-shaped body, wherein a supporting flange is formed extending inward around and from the circumference of an inner wall of the cylindrical neck below the top rim to form a circular closed ring, while an outer wall of the cylindrical neck is entirely even,
sidewalk of the conically-shaped body and sidewalls of the convex bottom have a same slope, wherein a thickness of the cylindrical neck increases at a location of the supporting flange, and wherein the supporting flange is used to secure the preform to a preform holder during a preform blowing process.