Filter manufacturing technique

Details Filter manufacturing technique Filter manufacturing technique

1981-08-25

1985-03-26

Millin, V.

Manufacturing container or tube from paper; or other manufacturi

Cigarette filter making

With shaping or compacting of filter material

493 41, 493 42, 493 45, 493 48, 493 49, 493 50, 156 622, 156296, B31B 2301, B32B 300

Patent

active

045071071

ABSTRACT:
Method and apparatus for producing axially elongated, self-sustaining, dimensionally stable smoke rods or the like from filamentary tow by feeding the tow into a confined zone having a non-porous section and a porous section, simultaneously feeding gas under pressure into the inlet end of the confined zone at a feed rate sufficiently high so as to pneumatically convey the tow through the confined zone in a rod-like formation substantially conforming to the cross-sectional size and shape of the confined zone, and sufficiently low so as to permit escape of at least a major portion of the feeding gas from the confined zone along the porous section, introducing a heated gas into the tow in a third section of the confined zone downstream from the porous section, maintaining the tow in contact with the heated gas for a time sufficient for the gas to contact the tow across substantially its entire cross-section and render the tow bondable and cooling the heated tow to bond the same into the rod-like shape. The rod can be withdrawn at substantially the same speed as the tow is being fed or it can be withdrawn at a slower speed whereby the fibers are reoriented into an adjacent and overlapping relation to one another generally transversely to the longitudinal extent of the treating zone. The initial tow can be slit to simultaneously form a plurality of rods from a single length of the starting material.

REFERENCES:
patent: 3819435 (1974-06-01), Roberts et al.

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