Building Surface Panels With Aged Foam Backing for Edge 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
The method involves aging foam pieces to achieve a residual shrinkage of no more than 0.2% after 30 days and 0.25% after 150 days at 23°C, and attaching them to the rear side of an outer shell to form the building surface panel, ensuring minimal curvature and reducing dimpling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If foam is attached to the outer shell immediately after manufacturing, then productivity is improved, but residual shrinkage causes dimpling at panel edges
Solution Approach 1:
The foam is pre-aged for a specified period (e.g., 7-14 days) at controlled temperature and humidity conditions before being attached to the outer shell. This preliminary aging action allows the foam to complete its shrinkage process beforehand, so that when attached, it maintains dimensional stability and does not cause dimpling at panel edges, thus resolving the contradiction between productivity and manufacturing precision.
2Manufacturing precision
If foam aging time is extended to reduce shrinkage, then panel flatness is improved, but manufacturing time increases
Solution Approach 1:
The aging process parameters (temperature, humidity, time) are optimized to achieve the desired shrinkage reduction in the shortest time. For example, aging at elevated temperatures (e.g., 50-70°C) accelerates the shrinkage process, allowing the foam to reach dimensional stability much faster than ambient aging, thus improving panel flatness while minimizing time loss.
Solution Approach 2:
The foam undergoes preliminary aging treatment in a controlled environment before attachment, which pre-completes the shrinkage process. This allows the foam to be ready for immediate attachment without causing subsequent dimensional changes, balancing the need for flatness with reduced overall manufacturing time.
3Ease of manufacture
If foam shrinkage is not controlled, then ease of manufacture is improved, but aesthetic appearance deteriorates due to dimpling
Solution Approach 1:
The foam is pre-aged to complete its shrinkage process before attachment to the outer shell. This preliminary action ensures that the foam is dimensionally stable when attached, preventing any subsequent shrinkage that would cause dimpling at panel edges, thus maintaining aesthetic appearance while keeping the attachment process simple.
Solution Approach 2:
The foam's physical and chemical parameters are controlled during the aging process (temperature, humidity, time) to achieve optimal dimensional stability. This parameter control ensures that the foam reaches its final dimensions before attachment, preventing shape changes that would affect the aesthetic appearance of panel joints.
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
This approach significantly reduces the bowing and dimpling of the panels, providing a smoother joint appearance and enhancing the aesthetic appeal of the building surface.
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%
Implementation Method 2
The foam piece can be provided, e.g., by aging the foam piece for a time and at a temperature such that the 150 day/23° C. residual shrinkage is no more than 0.25%
Data Source
AI summary
The present disclosure relates generally to cladding for covering a building surface. The present disclosure relates more particularly 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.