Device for the manufacture of a zip fastener

Details Device for the manufacture of a zip fastener Device for the manufacture of a zip fastener

1994-04-13

1996-06-25

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

To make slide fastener element

425556, 425577, 425814, 425DIG58, B29C 4540

Patent

active

055294820

ABSTRACT:
The manufacture of slit-type zip fasteners is accelerated by synchronizing the movement of the slit former with the movement of the ejector. A portion of the slit former slides while ejecting the product or closing the mould in a guide which causes a movement of the slit forming portion of the slit former obliquely to the general ejection direction thus pulling the slit forming portion out of the heads of the zipper teeth. The zip fastener is made preferably in a mould wherein the slider that comprises inter alia the moulds for the zipper stops is disposed asymmetrically at one end of the mould. The hot runner of this mould is designed in such a manner that the material flow is first directed to the feed nozzle furthest away from the slider and then to the nozzle next to the slider which is working for the injection moulding of a zip fastener of any length. This measure guarantees that the material above the inactive nozzles is permanently exchanged and that aging and decomposition processes of materials otherwise remaining in the hot runner are avoided.

REFERENCES:
patent: 2529091 (1950-11-01), Lester
patent: 3642417 (1972-02-01), Von Holdt
patent: 4019711 (1977-04-01), Altenhof et al.
patent: 4123495 (1978-10-01), Abey
patent: 4515342 (1985-05-01), Boskovic
patent: 4979288 (1990-12-01), Mayerhofer
patent: 5054183 (1991-10-01), Mayerhofer
patent: 5079820 (1992-01-01), Mayerhofer
patent: 5234329 (1993-08-01), Vandenberg
patent: 5281127 (1994-01-01), Ramsey

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