Method and apparatus for making a hollow filter and a filter rod

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

1975-07-16

1977-05-17

Simmons, David A.

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

Indefinite or running length flexible strand, rod, tube, or...

93 77FT, 156201, 156461, 264174, B29H 900

Patent

active

040240126

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: 2666947 (1954-01-01), Shaw
patent: 3016945 (1962-01-01), Wexler
patent: 3323961 (1967-06-01), Gallagher
patent: 3546325 (1970-12-01), Muller
patent: 3637447 (1972-01-01), Berger et al.
patent: 3668045 (1972-06-01), Molins

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