Exterior Cladding Moisture Pretreatment for Weatherproof Bonding
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Solution Overview
Problem
Existing composite materials with a glass layer and a wood or veneer layer are not suitable for outdoor use due to the risk of cracking and warping from high temperatures required for processing, and insufficient weather resistance at lower temperatures.
Innovation Solution
A method involving pre-treatment of the material layer to reduce residual moisture, followed by pressing with a heat-activated film to create a weatherproof composite, using a protective layer and/or additional film to encapsulate the material layer, allowing high-temperature processing without damage and ensuring strong adhesion between layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high temperatures are applied to process melt foils for bonding glass and wood veneer, then the bond strength between layers is improved, but the wood veneer cracks and warps
Solution Approach 1:
The wood veneer is pretreated by reducing its residual moisture content before bonding. This preliminary action prepares the wood veneer to withstand the high temperatures required for melt foil processing without cracking or warping, as the reduced moisture content prevents steam formation and dimensional instability during heating.
Solution Approach 2:
The residual moisture content of the wood veneer is changed from its natural state to a reduced level (below 12% preferably below 8%) before bonding. This parameter change enables the wood veneer to tolerate the high processing temperatures needed for optimal melt foil bonding without suffering from cracking or warping.
2Manufacturing precision
If low temperatures are used for bonding to preserve wood veneer integrity, then cracking and warping are prevented, but the bond strength and weather resistance are insufficient
Solution Approach 1:
The wood veneer is pretreated by reducing its residual moisture content before bonding. This preliminary action enables the wood veneer to withstand high temperatures during bonding without cracking or warping, thereby allowing optimal bond strength and weather resistance to be achieved while preserving veneer integrity.
Solution Approach 2:
The residual moisture content of the wood veneer is reduced to below 12% (preferably below 8%) before bonding. This parameter change allows the bonding process to be performed at high temperatures that ensure optimal weather resistance and bond strength, while the pretreated wood veneer remains free from cracking and warping.
3Strength
If the material layer is exposed to high temperatures during pressing, then the bond strength is improved, but shrinkage and cracks occur in the material layer
Solution Approach 1:
The material layer is pretreated by reducing its residual moisture content before the bonding process. This preliminary action stabilizes the material layer's dimensions and prevents shrinkage and cracks during high-temperature pressing, while still allowing optimal bond strength to be achieved.
Solution Approach 2:
The residual moisture content of the material layer is reduced to below 12% (preferably below 8%) before bonding. This parameter change enables the material layer to maintain dimensional stability during high-temperature pressing, preventing shrinkage and cracks while allowing optimal bond strength to be achieved.
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 enables the production of composite materials that are visually appealing and permanently weatherproof for outdoor use, with reduced risk of shrinkage or cracking, and enhanced durability and longevity.
Implementation Method 1
pressing with a heat-activated film to create a weatherproof composite
Implementation Method 2
Applying a protective layer to a back side of the material layer facing away from the glass layer, in particular to protect the back of the material layer from absorbing moisture
Implementation Method 3
Pretreating the material layer or several pieces of material by removing residual moisture
Data Source
Figure 1~3
Figure 4~5
AI summary
The invention relates to a method for manufacturing an outer cladding (9) for windows, doors or facades, wherein the outer cladding (9) comprises at least one glass layer (1) and a material layer (3) bonded to the glass layer (1), and wherein the method comprises at least the following steps: pretreating the material layer (3) or several material pieces by removing residual moisture; optionally joining several material pieces to produce the material layer (3); creating a composite by placing the material layer (3) onto the glass layer (1) with an interlayer of a film (2), in particular a plastic film, preferably a melt film, for example an EVA film, wherein the film is preferably UV and/or weather resistant; pressing the composite together under heat.