Extruder for welding plastic components

Details Extruder for welding plastic components Extruder for welding plastic components

2006-03-21

2006-03-21

Davis, Robert (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With separate and distinct upstream agitating or kneading means

Within pressurizing chamber

C425S202000, C425S376100, C425S378100, C366S081000, C366S158300

Reexamination Certificate

active

07014447

ABSTRACT:
An extruder for welding plastic components, comprising a front part for plasticizing and ejecting additional plastic welding material, and a rear part, for feeding and breaking up a continuous filament made of the additional plastic material. The rear part comprises a feed channel that cooperates with a worm screw for the advancement of the filament. The feed channel is delimited by the thread of the worm screw on one side and by a sliding surface for the filament on the opposite side. The distance between the sliding surface and the crest of the thread decreases in the direction in which the filament is fed, in order to provide scoring of increasing depth on the filament. The thread comprises at least one discontinuity of the worm that has a sharp discontinuity end for cropping the filament at the scoring.

REFERENCES:
patent: 1949658 (1934-03-01), Remseth et al.
patent: 3698844 (1972-10-01), Grimm
patent: 3743142 (1973-07-01), Elliott et al.
patent: 4262737 (1981-04-01), Faillace
patent: 5558886 (1996-09-01), Martinez-Bustos et al.
patent: 5671321 (1997-09-01), Bagnuolo
patent: 6854873 (2005-02-01), Rothemeyer

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