Method for stretching attachment devices at high speeds

Details Method for stretching attachment devices at high speeds Method for stretching attachment devices at high speeds

1977-05-11

1979-03-06

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

24150FP, 264334, B29C 1702

Patent

active

041431138

ABSTRACT:
A method for stretching at a high speed an attachment device composed integrally of a synthetic resin and comprising a head, a cross-bar and a filament connecting integrally the head and cross-bar to each other in disclosed. This method comprises applying to the attachment device a force in a direction separating the head and cross-bar from each other while the filament is in the heated state and the head and cross-bar are in the gripped state, thereby to stretch the filament, and immediately thereafter, applying a relaxing action to the filament and releasing the attachment device from gripping means. The ratio of relaxation of the filament after stretching is ordinarily 10 to 40% and is preferably 20 to 35%.

REFERENCES:
patent: 2377928 (1945-06-01), Fielitz et al.
patent: 3380122 (1968-04-01), Kirk
patent: 3577987 (1971-05-01), Bronnenkant

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