Method of molding and stretching stoppers
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United States of America Patent
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-
Apr 15, 1980
Issued Date -
N/A
app pub date -
Nov 14, 1977
filing date -
Dec 23, 1975
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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