VERFAHREN UND VORRICHTUNGEN ZUM HERSTELLEN VON TAFELN AUS GLASFASERVERSTAERKTEM ZEMENTAEHNLICHEM MATERIAL

• Main Authors: SASANO, TETSURO, CHIBA, YANO, TSUYOSHI, TOKIO, ICHIKAWA, KAZUMASA, KOGANEI, TAKE, TAKAO, MITAKA
• Format: Patent
• Language: German
• Published: 14.11.1974
• Edition: 2
• Subjects: PERFORMING OPERATIONS; SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG, OR MIXTURESCONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER; TRANSPORTING; WORKING CEMENT, CLAY, OR STONE

1463769 Continuously producing fibre-glass-reinforced slurry boarding ONODA CEMENT CO Ltd 4 April 1974 [18 April 1973 (3)] 15012/74 Heading B5A [Also in Division B2] A cementitious slurry and chopped glass fibres are sprayed from respective separate heads 11, 10 on to a conveyer belt to continuously form boarding, the separate streams of slurry and glass fibres being mixed intimately in the space between the spray heads 11, 10 and the belt. In a preferred embodiment for producing layered boarding, a cementitious powder 1 and aqueous solution or water 8 are fed as a slurry to a tank 5 by a mixer 4. The slurry and glass fibres cut from a roving are sprayed simultaneously on to the conveyer belt by at least one pair of heads 11, 10 movable with the conveyer, which comprises a rough rubber belt 12c, porous steel belt 12b and filter cloth 12a. The three belts are water-washed at 20 and the filter cloth 12a dried by rollers 23 and a suction box 24. Individually controllable suction boxes 14 apply pulsed suction forces to remove the aqueous solution of water from the mat M and recirculate it through gas/ liquid separators 15. Rolls 13 level the mat M and needle it to provide a rough surface. A blower 17 aids transfer of the mat M to a second conveyer belt at H where further chopped glass fibres and an air-entraining slurry are applied simultaneously by spray heads 37, 38, to form a lightweight mat M1. This slurry is mixed at 28 with air bubbles produced by mixing a foaming agent with water at 34 and feeding the air bubbles through a foaming machine 35. The upper surface of the mat M1 is finished by rollers 40, a vibrating plate 41 and a patterned roller 42. A third layer of non-foamed slurry and fibres can be applied. The layered boarding is cut by a cutter 43 and passes through a curing oven 45. In further embodiments, the mats M, M1 are moulded on respective conveyer belts to provide single layer boarding. Materials.-The slurry is formed from an aqueous suspension of admixtures of Portland, alumina or magnesia cement, gypsum, calcium sulfate hemihydrate, anhydrite, retarders, accelerators, waterproofers and dispersers, with (2-30) % by weight of alkali-resistant glass fibre for the mat M and (0À5-5)% by weight of glass fibre for the air-entrained mat M1. The foaming agent comprises saponin.