Apparatus and method for permanently joining plastic screw conve

Details Apparatus and method for permanently joining plastic screw conve Apparatus and method for permanently joining plastic screw conve

1987-04-20

1988-05-24

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

15624422, 1563043, 1563046, 156497, 198666, 198677, B32B 3106

Patent

active

047463848

ABSTRACT:
Apparatus for bonding or joining confronting edges of flights of adjacent integrally molded screw conveyor modules is disclosed. The apparatus comprises means for supporting a plurality of the modules in axial alignment and with confronting edges of the module flight members in confronting relationship. Also included is a clamping means for enclosing and maintaining the confronting edges in a fixed position. The clamping means includes at least one passage extending from outside the clamp to a position inside the clamp between the confronting edges. A heated gas such as nitrogen is provided through the passage to the confronting edge to heat the edges substantially to the melting point of the plastic modules. Subsequent to heating the edges with the hot gas, a liquid plastic material under selected temperature and pressure is injected through the clamp passage and into the space between the confronting flight edges to fill the space between the edges and to bond the flights together.

REFERENCES:
patent: 2815852 (1957-12-01), Harrer
patent: 3664444 (1973-05-01), Hensen
patent: 3839126 (1974-10-01), Haller
patent: 4691818 (1987-09-01), Weber

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