Method for integrally joining preformed thermoplastic core eleme

Details Method for integrally joining preformed thermoplastic core eleme Method for integrally joining preformed thermoplastic core eleme

1996-07-25

1997-08-05

Ball, Michael W.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156167, 156172, 156429, B01D 2702

Patent

active

056538332

ABSTRACT:
Apparatus and methods are disclosed whereby elongate preformed thermoplastic elements are friction-welded coaxially in an end-to-end manner so that the core elements are joined integrally to one another. Most preferably, the elongate elements are perforated tubular elements formed of a thermoplastic material which are employed as core elements in the production of cylindrical melt-blown filter cartridges. As such, the integrally joined core elements can be rotated and traversed as a unit relative to a melt-blowing die during the continuous production of indefinite length cylindrical melt-blown filter cartridges.

REFERENCES:
patent: 4112159 (1978-09-01), Pall
patent: 4116738 (1978-09-01), Pall
patent: 5152855 (1992-10-01), Jansman et al.

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