Method of molding and stretching stoppers

Details Method of molding and stretching stoppers Method of molding and stretching stoppers

1977-11-14

1980-04-15

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Stretching or stretch forming

425383, B29C 1702

Patent

active

041983700

ABSTRACT:
A blank of stoppers is molded from synthetic resin, each of said stoppers including a crossbar, a filament portion and a head. The filament portion has a smaller-diameter portion near the crossbar and a larger-diameter portion extending from the smaller-diameter portion toward the head at least on the portion to be stretched.
Metal mold members adapted to act as a drawing die are engaged to the connecting portion of the smaller-diameter and larger-diameter filament portions, and after the stoppers have been molded, the members forming the die are moved along the filament portion so that only the crossbars are gripped by the metal mold to prevent movement thereby subjecting the filament portions to stretching.

REFERENCES:
patent: 3380122 (1968-04-01), Kirk
patent: 3577987 (1971-05-01), Bronnenkant
patent: 3686717 (1972-08-01), Mercer
patent: 3733383 (1973-05-01), Bunney et al.

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