Cylindrical filter formed of stacked fibers having a high and lo

Details Cylindrical filter formed of stacked fibers having a high and lo Cylindrical filter formed of stacked fibers having a high and lo

1993-05-04

1995-07-04

Dawson, Robert A.

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

2104972, 156167, 156446, B01D 2702, B01D 3906

Patent

active

054297451

ABSTRACT:
A cylindrical filter formed of stacked microfine, conjugate fibers consisting of a higher melting point component and a lower melting point component, the fiber diameter of the conjugate fibers being varied into a smaller one in the thickness direction of the filter and along with the passing direction of a fluid to be filtered, and the contact points of the conjugate fibers being melt-adhered by the lower melting point component is provided. This cylindrical filter is produced by a process of subjecting a higher melting point component and a lower melting point component each consisting of a fiber-forming thermoplastic polymer to conjugate melt-blow spinning so that the fiber diameter is varied during the spinning into a smaller one in the thickness direction of the filter and along with the passing direction of the fluid, winding up and stacking the fibers on a core to form a cylindrical shape on the core, heat-treating the resulting web at a temperature higher than the melting point of the lower melting point component and lower than the melting point of the higher melting point component, before and/or at the time of or after the winding-up, and drawing out the core.

REFERENCES:
patent: 4021281 (1977-05-01), Pall
patent: 4197156 (1980-04-01), Nakajima et al.
patent: 4594202 (1986-06-01), Pall et al.
patent: 4726901 (1988-02-01), Pall et al.
patent: 4861633 (1989-08-01), Abe
patent: 5272023 (1993-12-01), Yamamoto et al.

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