External supported filter
AssigneeWhatman Reeve Angel Limited
InventorBrian Arthur Head
Life of this patent
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Abstract
A method of manufacturing an inside-to-outside flow filter tube and the filter tube so manufactured which comprises: providing a porous tube comprising a wet mat of randomly disposed glass fibers; positioning an external reinforcing sleeve material concentrically about the porous tube; applying an outward force to the porous tube to expand the external diameter of the porous tube into intimate contact with the sleeve material; and drying the tube and bonding the fibers of the tube into an integrally supported filter tube.
Claims27
A method of manufacturing an inside-to-outside flow filter tube of improved burst strength, which method comprises:
- a. forming a wet mat of a desired and generally uniform-depth, randomly disposed, nonwoven, inorganic fibers having interstices therebetween, and having a diameter of from about 0.001 to 10 microns, onto the external surface of a cylindrical, porous, vacuum mandrel to form a porous filter tube;
- b. positioning an external, reinforcement, porous, sleeve material, having a selected internal diameter slightly in excess of the external diameter of the wet mat of fibers of the filter tube, about the filter tube and into a concentric arrangement with the filter tube;
- c. applying an outwardly directed force to the fibers of the filter tube such that the external diameter of the filter tube expands into intimate contact with the concentric sleeve material;
- d. drying the filter tube so formed;
- and
- e. bonding the filter tube and external sleeve material with a bonding agent into an integral filter tube.
A method of manufacturing an inside-to-outside flow filter tube of improved burst strength, which method comprises:
- a. forming a wet mat of a desired and generally uniform-depth, randomly disposed, nonwoven, inorganic glass fibers having interstices therebetween, and having a diameter of from about 0.001 to 10 microns, onto the external surface of a cylindrical, porous, vacuum mandrel to form a porous filter tube;
- b. compressing the filter tube by rolling the filter tube on the mandrel under pressure on a surface, with a vacuum maintained in the vacuum mandrel during the forming and compressing steps;
- c. positioning an external, reinforcement, porous, sleeve material, having a selected internal diameter slightly in excess of the external diameter of the wet mat of glass fibers of the filter tube, about the filter tube and into a concentric arrangement with the filter tube;
- and
- d. applying an outwardly directed force to the glass fibers of the filter tube, such that the external diameter of the filter tube expands into intimate contact with the concentric sleeve material, by application of fluid pressure to the interior of the filter tube, or rolling the filter tube upon a surface.
Dependencies are inferred from the claim text.