Abstract: A method and apparatus for forming a multi-ply web of paper wherein a first layer is carried on the underside of a traveling felt to a bonding station located over the top of a forming cylinder on which a second layer is formed with a water bead in the nip between the layers and a laser or other device for generating a beam of energy at one end of the nip directing the energy along the water bead parallel to the nip and a receiver at the other end to detect the laser beam with means operated by the receiver for controlling the size of the water bead.

Abstract: A method and machine for manufacturing a multilayer paper board which includes an outer web bonded to a base web has the features of initially forming the outer web on a planar section of a single wire where through a suitable structure a first dewatering stage of the web on the single wire is provided, a second dewatering stage being provided by way of a suitable dewatering show subsequent to the first dewatering stage with this second dewatering stage having an initial portion where dewatering takes place simultaneous in opposite directions and a final portion where dewatering takes place only outwardly away from the first wire.

Abstract: A fibrous web is continuously formed between inner and outer endless foraminous forming belts between which stock slurry is fed from a headbox, the belts being held in tension as they wrap a first convexly curved forming run surface from which the outer belt is separated immediately following the forming run, the inner belt carrying the wet web then running over a second convexly curved surface from the offrunning side of which the inner belt is then separated and a porous pickoff belt is pressed by a substantial convex area of an imperforate pickup roll against the wet web on the inner belt, the inner belt being guided to diverge from the pickoff belt commencing at the off-running end of the convex area of contact of the pickup roll and the wet web being forced to adhere to the pickoff belt by the vacuum action of the imperforate surface of the pickup roll. By multiplication of the apparatus a multiply web can be formed.

Abstract: A continuous web of wood or cellulose pulp leaving a dewatering apparatus such as a suction mould or vat machine and having a relatively high content of water, is slitted in two or more longitudinal webs of approximately the same width. The narrow, slitted webs are turned so as to be parallel and brought together or gathered to a multilayer web which is narrower and thicker than the original web. This multilayer web is subjected to further dewatering in one or more pressing machines having dimensions adapted to those of the multilayer web. Finally, the multilayer web is cut transversely into sheets of appropriate size for stacking and packing in bales of suitable size.

Abstract: A paper forming machine includes at least one porous rotatable cylinder. An inner forming fabric or media in mesh form (hereinafter referred to as "inner forming media") is guided through a path around the cylinder and has a straight portion immediately before the cylinder. An outer forming fabric or media in mesh form (hereinafter referred to as "outer forming media") is guided so as to form a closing angle over the straight path of the inner forming media toward the uppermost portion of the cylinder, and is guided around a portion of the cylinder over the inner forming media and through a path in juxtaposition with the inner forming media leading away from the cylinder. Paper is formed by depositing a paper forming material slurry on the straight portion of the inner forming media which is porous so that the slurry becomes partly dehydrated and the fibers become oriented in the direction of movement.

Abstract: An improved low density asbestos-cement product and the process whereby it is produced wherein an asphalt emulsion is combined with the formulation from which the product is made, which asphalt emulsion has an asphalt phase which asphalt has a softening point of at least 150.degree.F and is dispersed in water in globules all smaller than 10 microns.

Abstract: A gypsum wallboard or plasterboard having a high mechanical strength, especially high impact strength, and a large bulk density is prepared from a mixture consisting essentially of calcined gypsum, cellulosic fibers, asbestos fibers, a setting retardant for the calcined gypsum and water, by withdrawing solid components of the mixture in layer form. A plurality of the thus-obtained layers is piled to form a preform of the desired thickness and pressure-molding the preform under a molding pressure of from 10 to 400 kg/cm.sup.2 to obtain the board product.