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Atmospheric steam curing technique for fiber cement external wall panel

A technology of fiber cement and atmospheric pressure steam, which is applied in the manufacture of tools, ceramic molding machines, etc., can solve the problems of products without strength and easy air bubbles, achieve high initial strength, not easy to air bubbles, and improve product quality and production efficiency.

Active Publication Date: 2011-08-03
BEIJING NEW BUILDING MATERIAL +1
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AI Technical Summary

Problems solved by technology

When the water consumption of the fiber cement exterior wallboard formula exceeds 40%, using the existing curing method will easily lead to problems such as lack of strength and easy air bubbles in the product

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0008] The normal-pressure steam curing process of the fiber cement exterior wallboard of the present invention specifically includes the following process steps:

[0009] First, after the fiber cement exterior wall panels are extruded, the fiber cement exterior wall panels are cured by low-temperature steam for 10-20 hours at 20-30°C, and the curing humidity is controlled at 60-80%. After the final setting of medium cement, enter the next curing stage;

[0010] 2) Carry out high-temperature steam curing at 60-90°C for 5-15 hours, and control the curing humidity at 70-90%, so as to avoid the fiber cement exterior wall board from being saturated by water absorption and affecting the strength due to excessive humidity.

[0011] The combination of low-temperature steam curing and high-temperature steam curing is used to steam-cure the fiber cement exterior wall panels, so that the product has a high initial strength, and the product is not easy to generate bubbles, and the produc...

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Abstract

The invention discloses an atmospheric steam curing technique for a fiber cement external wall panel, which comprises the following steps: (1) after a fiber cement external wall panel is subjected to extrusion forming, carrying out low-temperature steam curing on the fiber cement external wall panel at 20-30 DEG C for 10-20 hours under the humidity of 60-80%, and entering the next curing stage after the cement in the fiber cement external wall panel finally sets; and (2) carrying out high-temperature steam curing at 60-90 DEG C for 5-15 hours under the humidity of 70-90%. In the invention, the fiber cement external wall panel is subjected to steam curing in a low-temperature steam curing / high-temperature steam curing combined mode, so that the product has higher initial strength, and can not easily bubble; and thus, the product quality and production efficiency are enhanced.

Description

technical field [0001] The invention relates to a normal-pressure steam curing process for a fiber cement exterior wall board. Background technique [0002] Fiber cement exterior wall panels need to be cured by atmospheric pressure steam during the production process, so that the product has a certain initial strength to ensure the completion of subsequent production processes. When the formula water consumption of the fiber cement exterior wall board exceeds 40%, using the existing curing method will easily lead to problems such as lack of strength and easy air bubbles in the product. Conventional curing methods believe that in order to make cement products have initial strength quickly, the products need steam curing at higher temperature and higher humidity, which can speed up the hydration reaction rate of cement and achieve the purpose of accelerating the development of product strength. According to the present invention, the fiber cement exterior wallboard is a speci...

Claims

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Application Information

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IPC IPC(8): B28B11/24
Inventor 刘素梅易松林周小燕
Owner BEIJING NEW BUILDING MATERIAL
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