Seamless tubular nonwoven webs and filters thereof

Details Seamless tubular nonwoven webs and filters thereof Seamless tubular nonwoven webs and filters thereof

1975-05-12

1977-06-28

Lesmes, George F.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

210494R, 2104971, 428222, 428303, B01D 2910

Patent

active

040326888

ABSTRACT:
A process is provided for the continuous production of nonwoven webs in cylindrical or sheet form from thermoplastic fibers, spinning the fibers continuously from a melt onto a rotating mandrel and winding them up on the mandrel to form a generally spirally wound cylinder. Density of the wound cylinder is controlled by controlling the distance between the rotating mandrel and the orifices of the spinning die through which the molten polymeric material is spun. If the spinning of the fibers is continuous, the cylinder can be formed in a continuous length. Control of the spinning rate in relation to the diameter and rate of rotation of the mandrel and the rate of advance of the cylinder on the mandrel controls the thickness of the cylinder. The cylinder can be drawn off the mandrel and used as a cylinder, or either slit lengthwise and opened out, or collapsed onto itself, for use as a sheet. The process is particularly adapted for forming filter elements.

REFERENCES:
patent: 3065856 (1962-11-01), Goldman
patent: 3148101 (1964-09-01), Allman et al.
patent: 3334752 (1967-08-01), Matravers
patent: 3455460 (1969-07-01), Mahon et al.
patent: 3676242 (1972-07-01), Prentice
patent: 3691004 (1972-09-01), Werner et al.
patent: 3904798 (1975-09-01), Vogt et al.
patent: 3949130 (1976-04-01), Sabee et al.

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