Thermally formed filter

Details Thermally formed filter Thermally formed filter

1985-09-06

1986-12-16

Sever, Frank

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

210491, 210508, 264DIG48, B01D 3904

Patent

active

046294740

ABSTRACT:
A fluid filter and method for its manufacture in which an air laid batt is formed consisting of a randomly arrayed mixture of thermoplastic fibers and fibers which are not thermoplastic. The batt is cut into sections and is formed into cup-shaped articles in a heated mold. Accordingly, depending upon the degree of heat and pressure applied, the articles can be made of varying densities, to thereby provide articles of larger or smaller permeability and stiffness. The articles are then nested together to form a fluid filter in which fluid flows through the article of lowest density to remove the larger particles entrained in the fluid first, and then flows through articles of progressively higher density to remove progressively smaller particles. At least some of the particles have been heated and/or compressed sufficiently to be structurally self-supporting, thereby providing a filter article which does not need metallic centertube supports, etc., for structural rigidity.

REFERENCES:
patent: 2963744 (1960-12-01), Cooper
patent: 3003643 (1961-10-01), Thomas
patent: 3073735 (1963-01-01), Till et al.
patent: 3251475 (1966-05-01), Till et al.
patent: 3261473 (1966-07-01), Riede
patent: 3347391 (1967-10-01), Steensen

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