Aged Foam-Backed Cladding Panels to Prevent Joint Dimpling
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Solution Overview
Problem
Foam-backed building surface panels often form dimples at the edges where neighboring panels meet due to residual shrinkage of the foam after attachment to the outer shell, which is aesthetically undesirable and discourages builders and customers.
Innovation Solution
Aging the foam pieces to achieve specific residual shrinkage levels, such as 30 day/23° C. residual shrinkage of no more than 0.2% or 150 day/23° C. residual shrinkage of no more than 0.25%, before attaching them to the outer shell to form the building surface panel, thereby reducing bending stress and dimpling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If foam pieces are attached to the outer shell immediately after manufacturing, then production time is reduced, but residual shrinkage causes dimpling at panel joints
Solution Approach 1:
The foam pieces undergo an aging process before attachment to the outer shell. This preliminary action allows the foam to complete its shrinkage and stabilization process, eliminating residual shrinkage that would cause dimpling. The foam is aged for a specified period (e.g., 7-14 days) at controlled temperature and humidity conditions before being attached to the shell, ensuring dimensional stability is achieved in advance.
2Manufacturing precision
If foam pieces are aged for extended periods before attachment, then dimpling is eliminated, but manufacturing time increases
Solution Approach 1:
The aging process parameters (time, temperature, humidity) are optimized to achieve the minimum effective aging period. By controlling these parameters, the foam reaches its stable dimensional state faster. For example, aging at elevated temperatures (e.g., 50-70°C) accelerates the shrinkage process, reducing the required aging time from weeks to days while still eliminating dimpling.
3Stability of the object's composition
If foam shrinkage is allowed to occur after attachment, then foam dimensional stability is achieved, but panel curvature and dimpling occur
Solution Approach 1:
The aging process is performed before attachment to preemptively counteract the shrinkage that would otherwise occur after attachment. By allowing the foam to shrink and stabilize before being bonded to the shell, any further shrinkage is minimal and does not cause panel curvature or dimpling. This preliminary anti-action prevents the harmful effect of post-attachment shrinkage.
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 significantly reduces bowing and dimpling issues by ensuring the foam pieces reach their final dimensions before attachment, resulting in a smoother joint between panels and improved aesthetic appearance.
Implementation Method 1
The foam piece can be provided, e.g., by aging the foam piece for a time and at a temperature such that the 30 day/23° C. residual shrinkage is no more than 0.2%
Data Source
AI summary
The present disclosure relates generally to cladding for covering a building surface. The present disclosure relates more particularly to a method of manufacturing a building surface panel. The method includes providing a foam piece having a 30 day/23° C. residual shrinkage of no more than 0.2%. The foam piece having the 30 day/23° C. residual shrinkage of no more than 0.2% is attached to a rear side of an outer shell so as to form the building surface panel. In some embodiments, a front side of the outer shell forms a visible surface of the building surface panel. The foam piece can be provided, e.g., by aging the foam piece for a time and at a temperature such that the 30 day/23° C. residual shrinkage is no more than 0.2%. The foam piece to be aged can, in some embodiments, be cut from a body of foam.