Low air pressure method and apparatus for forming filter rods

Manufacturing container or tube from paper; or other manufacturi – Cigarette filter making – With shaping or compacting of filter material

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493 42, 493 48, 28255, 28273, 19 65T, 57350, B31C 1300

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active

045418250

ABSTRACT:
The present invention relates to high speed process and apparatus suitable for the preparation of cigarette filter rods having high tow utilization in terms of pressure drop per unit rod weight without producing substantial tow density variations. In accordance with this invention, it has been discovered that in a process for manufacturing filter elements from opened and deregistered crimped continuous filament tow, wherein said tow is conducted from a mechanical forwarding means through an aspirating jet positioned adjacent a compacting means and wherein means are provided for dissipating aspirating fluid, that filter rod pressure drop and weight variations are reduced by aspirating at low pressures and more specifically, at fluid pressures of not more than about 3 pounds per square inch gauge and by causing the aspirating fluid, at its point of contact with the continuous filament tow, to flow substantially in a direction axial to that of the tow.

REFERENCES:
patent: 3032829 (1962-05-01), Mahoney
patent: 3050430 (1962-08-01), Gallagher
patent: 3099594 (1963-07-01), Caines et al.
patent: 3173188 (1965-03-01), Wexler
patent: 3323961 (1967-06-01), Gallagher
patent: 3831501 (1974-08-01), Bevington
patent: 4181247 (1980-01-01), McFall
patent: 4411641 (1983-10-01), Suzuki et al.

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