MANUFACTURE OF FIBER-REINFORCED CEMENT PLATE

摘要

PROBLEM TO BE SOLVED: To effectively restrain the contraction of the front surface side of a fiber-reinforced cement plate while an addition amount of wollastonite is controlled by spreading a specific weight percent of wollastonite for the total solid weight of cement slurry on a green sheet immediately after the supply thereof on the surface of a filter cloth and then vibrating the green sheet. SOLUTION: First, 0.5-5 wt.% wollastonite 4 for the total solid weight of cement slurry 3 are spread on a green sheet 5 immediately after the supply thereof to a filter cloth 1 and then the green sheet 5 is vibrated. The wollastonite 4 is dispersed on the upper and the intermediate layer of the green sheet 5 after its dehydration. The wollastonite 4 is spread prior to the dehydration process using a suction box 6 and using a spreader 7. In addition, the green sheet 5 is vibrated by bringing the vibrating plate 9 of a vibrator 8 into contact with the surface of the green sheet 5 with the wollastonite 4 spread. Thus it is possible, to upgrade the anti-warpage performance and at the same time, control the addition amount of the wollastonite 4 and prevent the cost of a finished product from soaring.