Process for the joining of polyamide parts by friction welding

Details Process for the joining of polyamide parts by friction welding Process for the joining of polyamide parts by friction welding

1988-01-14

1990-04-24

Wityshyn, Michael

Stock material or miscellaneous articles

Sheets or webs edge spliced or joined

Sheets or webs coplanar

156 69, 156 735, 156295, 1563045, 4284747, B29C 6506

Patent

active

049199870

ABSTRACT:
A process and means for joining polyamide parts by friction welding, whereby the particles, called "turnings" formed and expelled from the welded joint are captured. In the production of many containers composed of relatively hard polyamides, having melting points above 250 degrees Celsius, it is necessary to prevent the turnings from falling into the inside of the container. This is particularly true when the turnings cannot be rinsed or sucked from the interior with relative ease or minimal cost, such as when walls, ribs or chambers are present inside the container. In the past, recesses have been provided near the joint to collect the turnings, however, such recesses did not prevent all turnings from being thrown into the interior of the container. To preclude all turnings from entering the interior of the produced container, the process uses joints having at least one weld surface coated with a cohesive and ductile plastic material and at least one gap formed between facing surfaces which are not welded together. When the surfaces to be joined are forced together, under heat and pressure, the ductile material is forced into the gap. The turnings produced during the friction welding are then absorbed, or captured, by the soft ductile plastic material.

REFERENCES:
patent: 3144710 (1964-08-01), Hollander et al.
patent: 4566924 (1986-01-01), Hara et al.
patent: 4663206 (1987-05-01), Bouyoucos et al.
patent: 4702790 (1987-10-01), Hugh et al.
patent: 4746381 (1988-05-01), Parker et al.
Land, W., "Reibschweiben Nach Dem Rotations- und Vibrationsverfahren" (Jan., 1983.
Vibrations-SchweiBgerat Modell 2100 von Branson (W. Germany, 4/1979).

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