Multi-layer Cementitious Panel Fiber Embedment
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Solution Overview
Problem
Conventional processes for producing cementitious structural panels face issues with uneven fiber distribution, leading to inconsistent reinforcing properties, high production costs due to premature slurry setting, and inefficiencies in fiber utilization, resulting in panels that lack the structural strength comparable to plywood or oriented strand board (OSB).
Innovation Solution
A multi-layer process involving the deposition and embedding of loose fibers within a settable slurry, using a conveyor-type frame with fiber distribution stations and embedment devices to ensure uniform fiber distribution throughout the panel, reducing the need for thick fiber mats and minimizing production line downtime caused by premature slurry setting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If discrete fibers are introduced in the slurry in a mat or web form to obtain desired panel thickness, then the panel thickness requirement is met, but the fibers are not properly and uniformly distributed in the slurry, leading to variable reinforcing properties and poor bonding
Solution Approach 1:
The fiber mat is divided into multiple discrete fiber layers, each separated by slurry layers. This segmentation allows individual fibers to be properly distributed throughout the slurry rather than remaining clumped in a single mat, achieving uniform fiber distribution while maintaining the desired panel thickness through multiple thin layers.
Solution Approach 2:
The fiber arrangement transitions from a two-dimensional mat structure to a three-dimensional distributed configuration. By spreading fibers across multiple layers separated by slurry, the fiber distribution extends through the thickness dimension, ensuring uniform reinforcement throughout the panel volume rather than concentrated at specific locations.
2Reliability
If conventional multi-layer slurry and fiber processes are used to produce structural panels, then production line downtime occurs due to premature setting of slurry, but this increases production costs and reduces productivity
Solution Approach 1:
Fiber layers are deposited and partially embedded before complete slurry setting occurs. This preliminary action ensures proper fiber distribution is established while the slurry is still workable, preventing premature setting issues that would require production line shutdowns and maintain continuous operation.
Solution Approach 2:
The process utilizes the dynamic state of slurry during the embedding phase, where the slurry transitions from a fluid state suitable for fiber embedding to a setting state. By completing fiber embedding while slurry remains dynamic and workable, the process avoids disruptions caused by premature setting and maintains continuous production flow.
3Strength
If thick fiber mats are used to achieve sufficient structural strength, then panel strength may be adequate, but fiber utilization efficiency decreases and production costs increase
Solution Approach 1:
Instead of using uniform thick fiber mats throughout the panel, the invention applies fiber layers locally at specific positions separated by slurry layers. This local quality approach ensures fibers are distributed where needed for structural strength while avoiding excessive fiber usage, improving fiber utilization efficiency and reducing production costs.
Solution Approach 2:
The panel structure becomes a composite of alternating fiber layers and slurry layers, where each component performs its optimal function. The fiber layers provide reinforcement while the slurry layers provide matrix bonding and fiber separation, creating an efficient composite structure that achieves required strength with optimized material usage.
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
The process results in structural cementitious panels with enhanced strength characteristics, reduced production costs, and improved fiber efficiency, meeting building code standards for shear resistance, load capacity, and water-induced expansion resistance, while being nailable and workable with conventional tools.
Implementation Method 1
an embedment device is provided downstream of the slurry feed station and is configured for actively embedding the loose fibers in the slurry layer
Data Source
AI summary
A process for producing fiber-reinforced structural cementitious panels made of at least one layer of fiber reinforced cementitious slurry, the process for each such layer of slurry including providing a moving web; depositing a first layer of individual, loose fibers upon the web; depositing a layer of settable slurry upon the deposited first layer of individual, loose fibers; depositing a second layer of individual, loose fibers upon the deposited layer of settable slurry; and actively embedding both layers of individual, loose fibers into the layer of slurry to distribute the fibers throughout the slurry.