Green Cement Sheet Shading for Color-Visible Fiber Cement Products
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Solution Overview
Problem
Existing methods for manufacturing fiber cement products often require the addition of decorative fibers, which increases costs and may compromise fire resistance, while achieving desired decorative effects through post-curing applications of particulate materials results in uniform coverage obscuring the underlying cement sheet's color.
Innovation Solution
A method involving the application of an aqueous dispersion of particulate inorganic material, such as xonotlite, to the surface of a green cement sheet during manufacturing, followed by pressing to achieve partial coverage, creating a shading layer that provides visual contrast and color softening without fully covering the underlying sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If decorative fibers are added into the green sheet to achieve desired decorative effects, then the aesthetic appeal is improved, but the fire resistance deteriorates and production costs increase
Solution Approach 1:
The patent applies the shading layer to the green sheet surface before curing, allowing the decorative effect to be achieved in advance during manufacturing. This preliminary action eliminates the need for post-curing decorative applications and prevents organic fiber degradation that would compromise fire resistance.
Solution Approach 2:
The patent replaces expensive and fire-risky organic decorative fibers with an inexpensive inorganic shading layer composed of water, calcium silicate, and pigment. This substitution uses a simple, short-lived aqueous application that dries to form a durable, fire-resistant decorative surface.
2Reliability
If an aqueous coating composition comprising xonotlite is applied to the first surface of the green sheet, then fire resistance is improved by reducing organic fiber material, but the decorative effect deteriorates due to uniform coverage obscuring the underlying cement sheet color
Solution Approach 1:
The patent creates local variation in the shading layer by controlling application parameters to achieve non-uniform coverage. This allows different regions of the surface to exhibit varying degrees of particle coverage, creating a textured, multi-dimensional decorative effect that reveals the underlying cement sheet color through gaps and variations in particle distribution.
Solution Approach 2:
The patent applies the shading layer at controlled concentrations and coverage levels to achieve partial coverage rather than complete uniform coating. This partial action allows the decorative effect to emerge from the interplay between the shading particles and the underlying cement sheet, creating visual depth and character while maintaining fire resistance.
3Ease of manufacture
If post-curing applications of particulate materials are used to achieve decorative effects, then aesthetic appeal is improved, but the underlying cement sheet color is obscured
Solution Approach 1:
The patent applies the shading layer to the green sheet before curing, when the cement matrix is still pliable and can be pressed into the surface. This preliminary application ensures that the shading particles become integrated with the cement sheet structure, creating a permanent decorative effect that maintains visibility of the underlying color through controlled partial coverage.
Solution Approach 2:
The patent creates localized variations in shading particle distribution and coverage, allowing different areas of the surface to reveal varying amounts of the underlying cement sheet color. This local quality control preserves the aesthetic appeal while maintaining visibility of the base material characteristics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the need for decorative fibers, enhances fire resistance, and allows for a cost-effective production of fiber cement products with decorative effects that maintain the visibility of the underlying cement sheet, offering improved mechanical properties and aesthetic appeal.
Implementation Method 1
applying an aqueous dispersion comprising a particulate inorganic material to a first surface of the green sheet... at least part of the particulate inorganic material is at least partially pressed into the green sheet
Data Source
Figure 1(a)~1(c)
Figure 2(a)~3
Figure 4A~4D
AI summary
The method of manufacturing a cementitious product comprises the steps of: (1) providing an aqueous slurry comprising cement; (2) manufacturing a green sheet having a first surface using said aqueous slurry, wherein said green sheet having a predetermined color and being provided with a shading layer comprising a particulate inorganic material at its first surface, and (3) curing said green sheet. The particulate inorganic material may for instance have an average diameter of 35-85 µm, and suitably comprises a calcium silicate material, such as xonotllite. After application of the particulate inorganic material, it may be pressed into the surface of the green sheet.