Dimensionally Stable Composite Wood Panel Flooring
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Solution Overview
Problem
Engineered wood panels often warp or bow due to the uneven distribution of forces caused by the application of a veneer on one face without a balancing force on the opposing face, necessitating the use of a costly balance layer for dimensional stability.
Innovation Solution
A method of altering the density profile of the core by removing the top face and an adjacent layer to create an exposed face, allowing the veneer to be adhered and offset internal imbalances, thereby eliminating the need for a balance layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a balance layer is applied to the bottom face of the core to provide dimensional stability, then warping and bowing are prevented, but cost and thickness increase
Solution Approach 1:
The invention extracts and removes the need for a separate balance layer by modifying the core's density profile directly. The core is engineered with an asymmetric density distribution where the bottom portion has higher density than the top portion, creating an internal balancing force that eliminates the requirement for an additional balance layer, thereby reducing product thickness and complexity.
Solution Approach 2:
The invention applies local quality by creating a non-uniform density distribution within the core material itself. The core features a density gradient where the bottom region has higher density and the top region has lower density, allowing different parts of the same component to serve different functional purposes - the high-density bottom provides balancing force while the overall structure maintains dimensional stability.
2Stability of the object's composition
If a balance layer is applied to the bottom face of the core to provide dimensional stability, then warping and bowing are prevented, but manufacturing cost increases
Solution Approach 1:
The invention merges the functions of the core and the balance layer into a single integrated component. By engineering the core with an asymmetric density profile during manufacturing, the core itself provides both structural support and dimensional stability, eliminating the need for a separate balance layer and reducing material costs, manufacturing steps, and overall production complexity.
Solution Approach 2:
The invention changes the density parameter distribution within the core material to achieve dimensional stability. By controlling the density gradient during core manufacturing - specifically creating higher density at the bottom and lower density at the top - the core develops internal stresses that counteract warping forces, providing dimensional stability without additional layers or costly post-processing.
Data Source
AI summary
In one aspect, a method of preparing a composite wood panel is provided herein which includes: providing a flat core formed of cellulosic material having opposing top and bottom faces, wherein a density profile is defined across the core representing density of the core at different locations between the top and bottom faces, the density profile including a first density profile portion extending from the bottom face towards the top face and including a first maximum density, a second density profile portion extending from the top face towards the bottom face and including a second maximum density, and a third density profile portion extending between, and connecting, the first and second density profile portions; removing the top face, and an adjacent layer, of the core to remove the second maximum density and to define an exposed face; and, adhering, using an adhesive, a veneer to the exposed face.