Chipboard Layering Fresh Wood Waste Material Surface Quality
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Solution Overview
Problem
The existing methods for producing chipboard using waste wood often result in contaminated top layers due to impurities like minerals, fine sand, and plastics, which hinder surface quality and reduce the service life of sanding belts, especially when using roller screens.
Innovation Solution
A method where chips for the outer cover layers are predominantly made from fresh wood and those for the inner cover layers and middle layer are made from waste wood, with separate processing and gluing to maximize the benefits of fresh wood in achieving high-quality surfaces and strength, while minimizing binder usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If chips from waste wood are used for top layers to increase waste wood utilization, then waste wood usage proportion is improved, but surface quality and sanding belt service life deteriorate due to contaminants
Solution Approach 1:
The patent divides the chipboard into multiple layers with different compositions: top layers made exclusively from fresh wood chips for high surface quality, middle layers from waste wood chips for cost efficiency, and bottom layers from fresh wood chips. This segmentation allows each layer to fulfill its specific function without compromise.
Solution Approach 2:
Different layers of the chipboard are assigned different material qualities according to their functional requirements. The top and bottom layers require high surface quality and are made from fresh wood, while the middle layers can tolerate lower quality and are made from waste wood, optimizing both surface appearance and resource utilization.
2Quantity of substance
If chips from waste wood are used for top layers to reduce costs, then material cost is improved, but binder consumption increases due to higher impurity content
Solution Approach 1:
The patent segments the chipboard structure to place waste wood chips only in the middle layers where binder consumption has minimal impact on overall product performance. This reduces total binder requirements compared to using waste wood throughout, while still achieving cost savings.
3Manufacturing precision
If separate processing lines for fresh wood and waste wood are used to maintain quality, then surface quality is improved, but device complexity increases
Solution Approach 1:
The patent implements separate processing lines for fresh wood and waste wood that converge at the layer assembly stage. While this increases device complexity, it enables precise control over layer composition and ensures top layers are made exclusively from fresh wood for high surface quality.
4Manufacturing precision
If fresh wood chips are used for outer cover layers to achieve high surface quality, then surface quality is improved, but waste wood utilization decreases
Solution Approach 1:
The patent uses a five-layer structure where only the outer cover layers (top and bottom) are made from fresh wood chips for high surface quality, while the inner cover layers and middle layer are made from waste wood chips. This maximizes waste wood utilization while preserving surface quality.
Solution Approach 2:
Fresh wood chips are localized to only those layers where surface quality is critical (outer cover layers), while waste wood chips are used in layers where surface appearance is less important (inner cover layers and middle layer), optimizing both quality and resource utilization.
Data Source
Figure 1~3
AI summary
The method involves forming chipping for an intermediate layer (4) and chipping for covering layers of a chip tray (1) separately. The chipping is formed from the fresh wood for external covering layer (2). The chipping is formed from the matured timber for internal covering layer (3).