Abstract: A filter material for filtering leucocytes from a fraction of or whole human blood, comprises a shape-sustaining laid textile web having a thickness of between about 2 millimeters to about 12 millimeters and a bulk density of about 0.05 to 0.4 g/cm.sup.3. The web has a plurality of interlocked, staple, textile fibers with average deniers between about 0.05 and 0.75 and average lengths between about 3 millimeters and 15 millimeters. The textile fibers are substantially uniformly distributed in the web so as to form a matrix of the textile fibers with spaces between adjacent interstices of interlocked fibers. A plurality of fibrillated particles of a polymeric material, e.g. a textile fiber material, having a surface area of between 5 and 60 square meters per gram are substantially disposed within the spaces of the matrix.

Abstract: A multi-component heat shield is provided. The shield includes at least one heat insulating component and at least one heat reflecting component having different coefficients of thermal expansion. The insulating and reflecting components are arranged with at least a portion of one of the insulating component's surfaces in registration with at least a portion of one of the reflecting component's surfaces. Movement of the components relative to one another is restricted at selected positions while the movement of the components is unrestrained between these positions. As heat is applied to the shield, the component with the greater coefficient of thermal expansion tends to expand at a greater rate than the component having the lower coefficient of thermal expansion. The stress which develops in the shield due to the restriction of the components at the selected positions is accompanied by changes in the spacing between the components.

Abstract: There is provided a high temperature resistant, insulating inorganic paper for use in high temperature environments. The paper containing a combination of staple ceramic fibers and staple glass fibers interlocked together into a shape sustaining form and having a thickness of from 10 mils to 1 inch. The glass fibers content is from about 0.5 to 10% and the average diameter of the glass fibers is up to about 50 microns.

Abstract: There is provided an integral textile composite which fabric comprises a substrate portion having at least one organic textile fiber layer and an insulating portion. The insulating portion has at least one inorganic fiber layer which is substantially co-extensive with the organic fiber layer, and at least one insulating layer of insulating material which is substantially less than co-extensive with the inorganic fiber layer. A plurality of first needled stitches composed of organic fibers from said organic fiber layer of said substrate portion are needled in and disposed at least substantially through the insulating portion, while the inorganic fibers of the inorganic fiber layer in the insulating portion are substantially undisturbed.

Abstract: In an alkaline dry cell battery separator being a laid mat of non-dissolvable polyvinyl alcohol fibers held together by a matrix of dissolved or partially dissolved dissolvable polyvinyl alcohol fibers, the improvement comprising the mat having up to 85% of cellulosic fibers relatively uniformly distributed in and among the non-dissolvable polyvinyl alcohol fibers and held therein by said matrix.

Abstract: A non-asbestos compressible sheet material usable for high-temperature gaskets preferably containing 10-50% by weight of an inorganic fibrous material, 10-90% by weight of an inorganic filler material, 4-30% by weight of an organic elastomeric binder, 2-10% by weight of an inorganic silicate binder and 1.0-10% of an organic fibrous material. The sheet material of the present invention may be manufactured on standard paper-making machinery.

Abstract: In an alkaline dry cell battery separator being a laid mat of non-dissolvable polyvinyl alcohol fibers held together by a matrix of dissolved or partially dissolved dissolvable polyvinyl alcohol fibers, the improvement comprising the mat having up to 85% of cellulosic fibers relatively uniformly distributed in and among the non-dissolvable polyvinyl alcohol fibers and held therein by said matrix.

Abstract: A composite is provided which has improved transverse structural integrity and flexibility and suitable for use in high temperature and high stress environments. The composite has randomly oriented high temperature resistant inorganic fibers interlocked together into a shape sustaining paper with a transverse thickness of from about 0.005 to 0.5 inch. A transverse strength providing high temperature resistant, flexible fabric, made of inorganic fibers is disposed upon at least one of the surfaces of said paper. An organic adhesive is disposed between the paper and the fabric and flexibly bonds the paper to the fabric to form a composite. The composite is sufficiently flexible that it may be folded or pleated without breaking and is capable of being used at high temperatures and at high transverse stresses without rupturing.

Abstract: A seal for a stationary pipe connected to a housing or chamber designed for high fluid pressures. The seal comprises a generally cylindrical metal shell and an elastomeric sealing liner bonded to the inner surface of the shell. The sealing liner has two sealing zones and a gradual ramp formation for centering and guiding the pipe thereinto during assembly.

Abstract: There is provided an integral textile composite fabric of non-woven, needled textile fibers which comprises at least one organic textile fiber layer of laid and needled textile organic fibers, at least one glass fiber layer of laid and needled glass fibers, and a plurality of needled stitches composed essentially of the organic fibers from the organic fiber layer needled in and disposed substantially through the glass fiber layer. The layers are bound together at their inner surfaces, are substantially non-detachable from each other and form an integral textile composite fabric having substantially uniform and high physical properties. There are at least 700 stitches per square inch passing through the glass fiber layer, and the organic fiber layer is essentially free, at least on the outer surface thereof, of glass fibers displaced from the glass fiber layer.

Abstract: There is provided a composite having improved structural integrity and suitable for use in abrasive, high temperature environments. The composite comprises randomly laid and oriented heat resistant fibers interlocked together into the form of a shape sustaining paper having two lateral surfaces. The paper has a thickness of from about 0.01 to 0.50 inch. An abrasion-resistant, high temperature resistant scrim is disposed upon at least one of the lateral surfaces of the paper, and a network of abrasion-resistant, high temperature-resistant threads is stitched through the scrim and the paper such that the scrim is mechanically locked to the paper by said threads. The network of threads and the scrim substantially retain the structural integrity of the said paper in use in the abrasive, high temperature environments.

Abstract: A textile composite is provided which comprises a non-woven textile fabric, composed of textile fibers needled together into a network of coherently entangled fibers and having an overall bulk density of between 4 and 20 lbs. per cubic foot, and a knitted textile fabric, having a weight of between 1 and 8 ozs. per square yard, bound to the needled fabric. The binding of the fabrics is such that at least one tensile property of the composite is greater than the sum of that same property of the non-woven and knitted fabrics. That same property is measurable at an extension which is the same or less than the extension at failure of the composite.

Abstract: There is provided a filter wherein the filtering means has a non-woven needled textile filter fabric with an overall bulk density of at least 6 pounds per cubic foot and bulk density gradient such that the bulk density at the face surface of the fabric is greater than the bulk density at the back surface of the fabric. In conjunction with that bulk density gradient is a filtering gradient such that the fineness of filtration at the back face surface is greater than the fineness of filtration at the surface. The filter may be in any convenient form, such as the bag of an air conveyor filter or a vacuum cleaner filter.

Abstract: There is provided an integral textile composite fabric of non-woven, needled textile fibers which comprises at least one organic textile fiber layer of laid and needled textile organic fibers, at least one glass fiber layer of laid and needled glass fibers, and a plurality of needled stitches composed essentially of the organic fibers from the organic fiber layer needled in and disposed substantially through the glass fiber layer. The layers are bound together at their inner surfaces, are substantially nondetachable from each other and form an integral textile composite fabric having substantially uniform and high physical properties. There are at least 700 stitches per square inch passing through the glass fiber layer, and the organic fiber layer is essentially free, at least on the outer surface thereof, of glass fibers displaced from the glass fiber layer.