Method for making a hollow filter rod

Details Method for making a hollow filter rod Method for making a hollow filter rod

1977-02-17

1979-12-18

Ball, Michael W.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

93 1C, 156202, A24C 550

Patent

active

041793234

ABSTRACT:
The apparatus is constructed to produce a hollow filter rod. The apparatus includes a mandrel through which a supplied length of tubing is passed, a nozzle surrounding the mandrel for shaping a stream of fibrous filter material about the mandrel and a forming means for enveloping a web of paper about the fibrous filter material and the tubing to produce the filter rod. The mandrel can be adjusted relative to the forming means to ensure an accurate centering of the tubing within the filter rod.
The hollow filter includes a rigid non-deformable tube defining a smoke passage having a draw resistance to control the amount of unfiltered smoke, a concentric layer of filter material and a perforated outer wrap for passage of air into the layer of filter material.

REFERENCES:
patent: 3016945 (1962-01-01), Wexler
patent: 3546325 (1970-12-01), Muller
patent: 3637447 (1972-01-01), Berger et al.

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