A technology for reducing surface density of paper-faced gypsum board

Abstract

The invention discloses a process for reducing the surface density of a paper-covered plasterboard. According to the paper-covered plasterboard produced by using the process of the present invention, the average surface density of the finished product is 4.0-6.0 kg / m<2> (bending [delta] 9.5 mm) and is 40-85% of the domestic industry average level, the bending strength of the finished product is 415-490 N, the moisture deflection is less than or equal to 3 mm, the edge hardness is 120-200 N, the end head hardness is 110-190 N, and various indices are much higher than the requirements of the national quality standard GB / T9775-2008. According to the present invention, under the premise of reduction of the paper-covered plasterboard surface density, the mechanical property of the plasterboard is increased, and the performances such as sound insulation and heat insulation can be increased with the plasterboard core closed-cell structure so as to easily construct; and during the production process, the gypsum consumption is significantly reduced, and the consumption of the molding gypsum powder and the molding water is saved, such that the heat required by the gypsum roasting and the plasterboard drying is substantially reduced, the raw material cost is saved, the fuel cost is saved, the requirements of energy saving and environmental protection are met, the needs of the market are met, and the process is suitable for the large-scale promotion and application.

Description

technical field [0001] The invention relates to the field of gypsum board production, in particular to a process for reducing the surface density of a paper-faced gypsum board. Background technique [0002] Paper-faced gypsum board has the advantages of heat insulation, sound insulation and easy construction. It is mostly used in building decoration projects such as partition walls and ceilings, and is a good building decoration material. With the development of structured buildings, lightweight building materials are particularly important for the lightweight of high-rise buildings. Low surface density gypsum boards have the advantages of better heat and sound insulation and easier construction, which is more in line with market demand; The country pays more and more attention to environmental protection, and the requirements for low-carbon and energy-saving production in the building materials industry are becoming more and more stringent. Low surface density gypsum boards...

AI Technical Summary

Problems solved by technology

However, there are two technical problems in reducing the weight of gypsum boards: on the one hand, advanced foaming technology is required for weight reduction to fill the space of the gypsum core board and reduce the surface density; There will be quality problems such as resurgence, low strength, easy deformation, and low corner hardness, which do not meet the national quality standards. Therefore, the surface density of gypsum boards circulating on the market is not less than 7kg / ㎡ (fold δ9.5mm)

Images