Composite Board with Resin-Impregnated Paper Bonding
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Solution Overview
Problem
Existing composite wood boards face limitations in strength due to the weakness of the glued joint between the middle and outer layers, and the complex, inefficient process of gluing introduces uneven distribution and liquid-related deformations.
Innovation Solution
Incorporating artificial resin-impregnated paper between the middle and outer layers of a composite board, which connects them without the need for liquid glue, enhancing strength and stability by acting like a reinforcement and tension rod.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If liquid glue is used to connect the middle layer and outer layer, then the connection is achieved, but uneven distribution of glue and liquid-related deformation occur
Solution Approach 1:
A fleece fabric is introduced as an intermediary material between the middle layer and outer layer. The fleece absorbs excess liquid glue and distributes it uniformly across the bonding surface, preventing both glue deficiency and excessive liquid accumulation that causes deformation. This mediator resolves the contradiction by enabling adequate glue connection while ensuring uniform distribution.
Solution Approach 2:
The viscosity and quantity of liquid glue are controlled within specific ranges, and the fleece fabric's grammage and absorbency are selected to optimize glue distribution. By adjusting these parameters, the system achieves sufficient bond strength while preventing uneven glue distribution and associated deformations.
2Strength
If liquid glue is used to connect the middle layer and outer layer, then the connection is achieved, but deformation of layers during glue setting occurs
Solution Approach 1:
The fleece fabric acts as a buffer between the liquid glue and the wood layers. It absorbs excess moisture and controls the release of glue, preventing sudden liquid accumulation that would cause layer deformation during the setting process. This maintains layer stability while achieving adequate bond strength.
Solution Approach 2:
The fleece fabric is pre-positioned on the bonding surface before glue application. It is specifically selected with appropriate absorbency characteristics to anticipate and counteract the deforming effect of liquid glue, thereby cushioning the layers against deformation during the critical setting phase.
3Strength
If plywood with high bending strength is used for the middle layer, then the strength is improved, but the complexity of selecting and producing suitable plywood increases
Solution Approach 1:
Instead of requiring uniformly high-strength plywood throughout, the invention allows the middle layer plywood to have varying grades in different regions. The fleece-reinforced bonding system compensates for local variations in plywood strength, enabling the use of more economically produced plywood with localized quality variations rather than requiring uniformly high-grade material throughout.
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 composite board exhibits significantly improved transverse tensile strength, flexural strength, and surface soundness, with enhanced durability and reduced deformation risks, making it suitable for demanding applications like construction and furniture making.
Implementation Method 1
an artificial resin-impregnated paper is utilized between the middle layer and at least one outer layer... The artificial resin-impregnated paper connects the middle layer and the at least one outer layer to one another
Implementation Method 2
The artificial resin-impregnated paper consists of a paper web, mostly having the dimensions of the middle layer or outer layer which is to be connected, wherein the paper web is impregnated with a liquid artificial resin and subsequently dried
Data Source
AI summary
The invention relates to a composite board composed of wood material, comprising a middle layer composed of plywood, wherein the middle layer is connected to at least one outer layer composed of fiberboard. In order to provide an economically producible composite board having improved strength properties, an artificial resin-impregnated paper according to the invention is arranged between the middle layer and the outer layer. The invention further relates to a method for producing the composite board composed of wood material.