Construction Board With Partial Cover Layers
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Solution Overview
Problem
Wood construction boards with high flexural strength, such as OSB boards, often have a rough surface that is disadvantageous for subsequent surface processing like painting, and multilayer hybrid boards with fine chip cover layers compromise bending strength by placing strand cores far from the surface.
Innovation Solution
A construction board design featuring non-full-surface cover layers with individual strands extending through to the surface, using a thin OSB core layer with multiple sublayers of strands oriented differently, and thin fine chip cover layers that only partially cover the core, ensuring high flexural strength and good surface quality without significant impairment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If OSB boards are made from strands to achieve high flexural strength, then bending strength is improved, but surface quality deteriorates due to rough surface from coarse particles
Solution Approach 1:
The board is divided into multiple layers with different particle sizes: a core layer of strands for structural strength and cover layers of fine chips for surface quality. This segmentation allows each layer to fulfill its specific function optimally.
Solution Approach 2:
Different regions of the board have different material compositions tailored to their specific requirements: the core uses coarse strands for strength, while the cover layers use fine chips for smooth surface finish, creating local optimization of properties.
2Manufacturing precision
If cover layers made of fine chips are applied to improve surface quality, then surface finish is improved, but flexural strength is reduced because strands are positioned far from the surface
Solution Approach 1:
The board structure separates the functions of strength and surface quality into different layers, allowing fine chip cover layers to improve surface finish while maintaining strand-based structural integrity through the core layer.
Solution Approach 2:
The board uses a composite structure combining strands and fine chips in specific layers, creating a material system that simultaneously achieves both high flexural strength from the strand core and excellent surface quality from the fine chip cover layers.
3Manufacturing precision
If thick cover layers are used to completely cover the OSB core, then surface quality is improved, but material consumption increases and bending stiffness is compromised
Solution Approach 1:
Instead of using thick cover layers that completely cover the core, the invention applies thin cover layers that only partially cover the strand ends. This partial action is sufficient to achieve the desired surface quality while minimizing material consumption.
Solution Approach 2:
The invention extracts the essential function of cover layers (surface quality improvement) without the unnecessary material consumption associated with thick complete coverage. The thin partial cover layers suffice to mask the rough surface while allowing strand ends to remain visible in certain patterns.
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 solution results in a wood construction board with excellent strength properties and surface quality, suitable for further processing, achieved by using a thin OSB core layer with oriented strands and fine chip cover layers that require minimal material while maintaining bending stiffness.
Implementation Method 1
using pressure and heat by pressing (in a hot press)
Implementation Method 2
using pressure and heat by pressing (in a hot press)
Implementation Method 3
The particles are always pressed with suitable binders
Data Source
AI summary
The invention relates to a material board, in particular an engineered wood board (1) comprising at least one core layer (2) made of strands (3), and outer layers (4, 5) made of chips (6), characterised in that one or both of the outer layers (4, 5) is/are designed as partial-coverage outer layers such that individual strands (3) extend at least partly through the outer layer (4, 5) up to the board surface, thereby forming interruptions in the outer layer (4, 5).