C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 38/10 (2006.01) C04B 28/14 (2006.01) E04C 2/04 (2006.01)
Patent
CA 2502147
Provided is a method of manufacturing a weight-saved foamed gypsum board having a gypsum core with high strength and excellent adhesion properties of the gypsum core with base papers for gypsum board, which method is capable of adjusting the sizes of pores in a gypsum core of a weight-saved gypsum board product into a desired range in a short time and at a low cost, even if the kinds and the compounding ratios of gypsum raw materials vary. The method of manufacturing a weight-saved gypsum board in which pores with a predetermined size are distributed in a gypsum core, includes the steps of blowing air into a foaming agent to produce foams, mixing the foams into a kneaded material that contains calcined gypsum and water to obtain foamed gypsum slurry, pouring the foamed gypsum slurry into a space between upper and lower base papers for gypsum board, shaping the base papers and the foamed gypsum slurry into a board shape, roughly cutting off and subsequently drying the board-shaped one, and cutting off the dried and shaped one into a product dimension, wherein the method further comprises the step of preliminarily adding a pore size adjusting agent for adjusting sizes of foams distributed in the foamed gypsum slurry to one of a stock solution of the foaming agent and a mixture of a stock solution of the foaming agent and water to obtain the foaming agent for producing foams with desired sizes.
Procédé servant à fabriquer une plaque de plâtre légère et consistant à effectuer l'apport préalable d'un agent d'ajustement de la dimension des vides capable d'ajuster la distribution dimensionnelle des mousses dispersées dans une boue liquide de plâtre moussant en un liquide original d'agent moussant ou en un mélange du liquide original d'agent moussant avec de l'eau, ce qui permet de préparer un agent moussant produisant des mousses présentant une distribution dimensionnelle désirée. Ce procédé permet de fabriquer une plaque légère dont l'âme présente une résistance élevée et une adhérence excellente entre la partie centrale de plâtre et le carton de doublure permettant d'obtenir la plaque, et permet également de régler la dimension des vides de la partie centrale de plâtre afin de les maintenir dans une plage souhaitée, en une durée limitée de manière économique, même en cas de modification des types et des rapports de composition des matières premières composant le plâtre.
Nakamura Yoshitsugu
Seki Masanobu
Fetherstonhaugh & Co.
Yoshino Gypsum Co. Ltd.
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