초록 ▼

A method of manufacturing a fibrous, nonwoven, flow filter tube and the filter tube so prepared, which method comprises forming a filter tube from an aqueous slurry containing an admixture of both low-melting-point binder and high-melting-point filter fibers, and, thereafter, heating the filter tube

A method of manufacturing a fibrous, nonwoven, flow filter tube and the filter tube so prepared, which method comprises forming a filter tube from an aqueous slurry containing an admixture of both low-melting-point binder and high-melting-point filter fibers, and, thereafter, heating the filter tube to a temperature greater than the temperature of the low-melting-point fibers and less than the temperature of the high-melting-point fibers, to effect melting of the low-melting-point fibers, the molten material of the low-melting point fibers forming at the crossover points of the high-melting-point fibers to act as a bonding agent, thereby preparing a nonwoven, self-supporting, fibrous filter tube composed of the filter fibers.

대표청구항 ▼

A method of preparing a nonwoven, fibrous, self-supporting, semirigid, all-inorganic, silicate-bound, filter tube consisting essentially of a plurality of interrelated, nonwoven fibers having interstices therebetween, the fibers bonded at the crossover points of the fibers with a bonding agent, whic

A method of preparing a nonwoven, fibrous, self-supporting, semirigid, all-inorganic, silicate-bound, filter tube consisting essentially of a plurality of interrelated, nonwoven fibers having interstices therebetween, the fibers bonded at the crossover points of the fibers with a bonding agent, which method comprises: (a) preparing an aqueous slurry comprising an admixture of low-melting-point, glass-binder fibers and high-melting-point, inorganic, filter fibers, the difference in melting point being greater than 100°F., the glass-binder fibers being present in an amount sufficient to act as a bonding agent for the inorganic filter fibers, the inorganic fibers being present in an amount sufficient to provide for a formed, porous, filter tube; (b) forming the fibers from the slurry into a nonwoven filter tube comprising a wet mass of the fibers; (c) heating the filter tube so formed to dry the filter tube; (d) heating the dried filter tube for a timed period and to a temperature greater than the melting point of the low-melting-point, glass-binder fibers and less than the melting point of the high-melting-point, inorganic filter fibers, to melt substantially all of the low-melting-point, glass-binder fibers and to have the low-melting-point molten material move to the crossover points of the inorganic filter fibers, the heating carried out, without any substantial softening of the inorganic filter fibers; and (e) cooling and recovering the porous filter tube of inorganic fibers, wherein the glass of the glass fibers forms the bonding agent for the inorganic filter tube. The filter tube prepared by the method of claim 1.