Abstract: A soundproofing material including a porous body having a cell structure and including inorganic fibers other than asbestos, wherein an average cell diameter is more than 300 ?m and 1000 ?m or less, a bulk density is 0.007 to 0.024 g/cm3, and a flow resistivity is 170,000 to 2,000,000 Ns/m4.

Abstract: The invention relates to particle boards, e.g. wood particle- or chipboards, for building purposes, which have been reinforced by means of glass fibre filaments or threads placed in the boards. The threads are laid to obtain increased rupture strength and increased resistance to punch-through of concentrated loads, and are fixed at given spacing in conjunction with the board manufacturing process. The method of reinforcing the boards during manufacture is also included by the invention.

Abstract: The invention relates to reinforced beam sections produced by forming the cross-sectional configuration of wood particle board, e.g. such as have been provided with bonded-in reinforcing threads (4,5,6,32,48). The latter have thereby been laid in the zones (33,34,45) of the boards where the beam section configuration changes direction during the formation of the beam. Beam sections in accordance with the invention will be light, corrosion-resistant and saving on material as well as having high breaking strength, due to the reinforcement. The field of use for such beam sections is very varied, but among more obvious uses may be mentioned those as beams in housing structures and different kinds of batten in the building trade. A method of laying the reinforcing threads in predetermined zones in the boards is also embraced by the invention.

Abstract: A machine and method of forming fiberglass mats. Chopped glass fibers are mixed with water in a slurry and a movable screen is passed, generally upwardly, through a slurry. As the screen is moved, its surface is uniformly coated with the glass fibers in a uniformly increasing depth, dependent upon the length of travel of the screen through the slurry. Longitudinally oriented and randomly oriented continuous strands are projected onto the fibers captured on the screen at different locations in order to provide the resultant mat with tear strength in all directions. The screen passes over a vacuum for removal of most of the water from the workpiece; subsequently, a binder is added to the workpiece and the continuous mat is passed through an oven for curing of the binder. The mat is then wound upon a spool for later transport to a location in which the mat can be processed into a final product.

Abstract: A process of preparing an inside-to-outside flow filter tube, which process comprises dispersing a plurality of glass fibers in water to form a water slurry of the fibers, the glass fibers having a diameter range of from about 0.001 to 10 microns; forming a filter tube comprising a wet mat of the glass fibers from the water slurry on a cylidrical mandrel; during the forming of the wet mat of fibers into a filter tube, incorporating an open-scrim, reinforcing sheet material within the internal wall thickness of the wet mat of fibers forming the filter tube, the sheet material extending generally the length of the filter tube and at least about 11/2 revolutions of the filter tube diameter; drying the filter tube containing the scrim sheet material within the filter tube wall; bonding the dried filter tube with a bonding agent at the junction of the glass fiber crossover points and with and through the scrim sheet material; and recovering an integral filter tube having a high burst strength.