Suspended Ceiling Runner Adhesive Bonding Design
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Solution Overview
Problem
The use of thick sheet metal and large cross-sections in ceiling grid runners increases manufacturing and shipping costs, and the application of adhesives to strengthen thinner materials can damage forming tools, cause structural issues, and lead to poor folding characteristics due to adhesive flow or expansion.
Innovation Solution
The design incorporates parallel channels and indent portions in the web portions to house low viscosity adhesive, which enhances torsional resistance and flexural load carrying capacity while preventing adhesive contact with forming tools, allowing for efficient manufacturing with thinner materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thick sheet metal and large cross-section runners are used, then structural integrity and load bearing capacity are improved, but manufacturing cost and shipping cost increase
Solution Approach 1:
The runner is divided into multiple layers with overlapping sections. Each layer is interconnected through adhesive bonding, creating a segmented structure that achieves high load bearing capacity without requiring thick single-layer sheet metal. The overlapping layers distribute mechanical loads across multiple bonding interfaces.
Solution Approach 2:
The runner combines multiple layers of sheet metal with adhesive material to form a composite structure. This composite construction provides enhanced flexural and torsional stiffness compared to solid sheet metal of equivalent mass, allowing thinner materials to achieve the same structural performance.
2Strength
If adhesive is applied to interconnect overlapping layers, then torsional stiffness and load distribution are improved, but forming tools suffer wear and damage
Solution Approach 1:
The adhesive application process is separated from the metal forming operations. Adhesive is applied after the runner layers are formed and positioned, rather than during the forming process itself. This extraction eliminates the harmful interaction between adhesive and forming tools while maintaining the bonding function.
Solution Approach 2:
The runner layers are pre-formed and positioned before adhesive application. The overlapping geometry and alignment are established through forming and assembly operations, then adhesive is applied as a subsequent bonding step. This preliminary positioning ensures proper alignment without adhesive interference in the forming tools.
3Strength
If low viscosity adhesive is used, then proper bonding is achieved, but adhesive flows and collects in folds causing structural defects
Solution Approach 1:
The runner design incorporates specific geometric features at the overlapping regions, such as staggered joints and controlled gap distributions. These local geometric variations manage adhesive flow patterns, ensuring low viscosity adhesive bonds effectively without pooling in critical folding areas. The local geometry directs adhesive to optimal bonding zones.
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 configuration enables the use of thinner materials for ceiling grid runners, reducing costs and maintaining structural integrity, while minimizing tool damage and ensuring proper folding, thus achieving effective load distribution and torsional stiffness.
Implementation Method 1
One way to interconnect the overlapping webs or layers of the runner is to use adhesive
Implementation Method 2
the application of adhesives to strengthen thinner materials can damage forming tools, cause structural issues, and lead to poor folding characteristics due to adhesive flow or expansion
Data Source
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AI summary
Grid members, namely a runner (10) and wall angle (400) for suspended ceiling grids, are disclosed. Certain embodiments of the runner and the wall angle have two web portions (28, 30) and at least one distinct indent portion (62) to define a space between the web portions. An adhesive (56) may be disposed within one or more of the indent portions (62) to adhere the two web portions (28, 30) to each other. Certain embodiments of the runner or wall angle have flange portions (32, 34) that may have indent portions as well. One or more of these indent portions may contain adhesive. Some embodiments of the runner or wall angle have overturned cap portions on the flange portions, and an adhesive may be placed between the overturned cap portions and upwardly facing surfaces of the flange portions.