Wood Fiber Board Density Gradient for Stability and Insulation
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Solution Overview
Problem
Existing wood fiber insulation boards face challenges with dimensional stability and surface adaptation, as they either lack edge bulk density increases, leading to instability, or have increased density that prevents conforming to uneven surfaces and application of decorative layers without additional support.
Innovation Solution
A method where moisture and hot gas are introduced into a preform of glued particles, with coordinated pressure application to cure different parts of the board at varying stages, allowing for a bulk density gradient that enables both dimensional stability and deformability, particularly by increasing density in cover layers while maintaining low density in the middle layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If wood fiber insulation boards are produced with low average bulk density for good insulation performance, then thermal insulation is improved, but dimensional stability deteriorates due to lack of edge bulk density increase
Solution Approach 1:
The patent applies local quality by creating different bulk density characteristics in different regions of the board. The cover layers are designed with increased bulk density at their edges compared to their center, while the middle layer maintains relatively uniform low bulk density. This local density variation provides dimensional stability at the edges where it is needed most, while preserving low overall density for insulation performance.
Solution Approach 2:
The board is segmented into distinct functional layers: cover layers with edge density increase for stability, and a middle layer with uniform low density for insulation. This segmentation allows each layer to fulfill its specific function without compromising the other, resolving the contradiction between stability and insulation.
2Stability of the object's composition
If edge bulk density increase is created for dimensional stability, then stability is improved, but adaptability to uneven surfaces deteriorates as the board becomes rigid and cannot conform to irregular surfaces
Solution Approach 1:
The patent creates local quality differences where cover layers have edge density increase for stability, but the center regions and middle layer maintain lower, more uniform density that allows flexibility. This enables the board to be stable at edges while remaining adaptable to uneven surfaces in the center and thickness direction.
Solution Approach 2:
By segmenting the board into cover layers with edge density increase and a middle layer with uniform low density, the invention allows different regions to have different mechanical properties. The middle layer provides flexibility for surface adaptation, while the cover layer edges provide dimensional stability.
3Use of energy by moving object
If uniform low bulk density is maintained throughout the board for maximum insulation, then thermal insulation is improved, but mechanical strength deteriorates preventing direct application of decorative layers
Solution Approach 1:
The patent applies local quality by creating regions of different bulk density: the cover layers have increased bulk density at their edges to provide mechanical strength for supporting decorative layers, while the center regions and middle layer maintain low bulk density for thermal insulation. This resolves the contradiction by providing strength only where needed.
Solution Approach 2:
The board is segmented into load-bearing cover layers with localized density increase and insulation-oriented middle layers with uniform low density. This segmentation allows the cover layers to provide mechanical support for decorative applications while the middle layers maximize thermal insulation performance.
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 method results in a board with a rigid cover layer for stability and a deformable layer for surface adaptation, enhancing thermal insulation and allowing direct application of decorative layers without additional support, while maintaining low overall bulk density for reduced material usage.
Implementation Method 1
introduction of moisture and hot gas into the preform made of glued wood fibers and calibrated in its thickness in order to activate the binder and harden the preform
Implementation Method 2
application of pressure to the preform
Implementation Method 3
binders containing NCO groups, in particular in the form of so-called PMDI binders... a PUR binder which, in addition to the PMDI component with the NCO groups, has a polyol component
Implementation Method 4
use a PUR binder, i. H. form a foaming binder from a PMDI component and a polyol component, which reacts in such a way that cavities between the wood fibers to be connected are filled with a PUR foam
Data Source
Figure 1~2
Figure 3~4C
Figure 5A~6C
AI summary
The board has a molded density profile on a wood fiberboard with a center molded density of approximately 60 kilograms/meter cube. The profile is sectioned into two cover layers and has a center layer lying between the cover layers. Small parts e.g. fibers containing lignocellulose, in the board are glued with a bonding agent to form a preform (6). The molded density of the board is increased from the center layer to one cover layer. One molded density of the board in an area of the center layer is larger than another molded density of the board in an area of another cover layer.