Snap-In Edge Trim Assembly for Durable Refrigerated End Panels
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Solution Overview
Problem
Refrigerated display cases face accelerated wear due to temperature changes and vibrational stresses, leading to material expansion and shrinking issues, and existing end panel manufacturing processes are labor-intensive, wasteful, and prone to breakage.
Innovation Solution
An end panel design featuring two end sheets with a trim body and trim skin, where polyurethane liquid is injected between the sheets to fill a shape pattern, solidifying into foam for a strong, durable connection, reducing material waste and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional manufacturing processes are used for end panels, then labor intensity and material waste increase, but structural integrity can be maintained
Solution Approach 1:
The patent changes the physical state of polyurethane from solid blocks to liquid form, allowing it to be injected into molds and solidify into foam. This parameter change enables complex shapes to be manufactured with minimal material waste and automated processes, directly resolving the contradiction between manufacturing efficiency and material waste
Solution Approach 2:
The patent replaces traditional mechanical assembly methods with chemical bonding through liquid polyurethane injection. The liquid polyurethane chemically bonds to the end panels and trim members, substituting mechanical fastening systems with a chemical bonding process that reduces labor intensity and enables automated manufacturing
2Reliability
If refrigerated display cases are subjected to temperature changes and vibrational stresses, then material expansion and shrinking occur, but structural integrity deteriorates
Solution Approach 1:
The patent uses composite construction with trim members made from multiple materials (metal, plastic, or wood) combined with liquid polyurethane that solidifies into foam. This composite structure accommodates thermal expansion and contraction of different materials while maintaining overall structural integrity under temperature changes and vibrational stresses
Solution Approach 2:
The patent utilizes the phase change of polyurethane from liquid to solid foam, creating a material that can adapt to dimensional changes. The foam structure provides flexibility to accommodate thermal expansion and contraction while maintaining structural stability, resolving the contradiction between reliability under temperature changes and material dimensional stability
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 solution enhances the structural integrity and durability of end panels, reducing breakage and manufacturing waste while providing a cost-effective, aesthetically pleasing solution for refrigerated display cases.
Implementation Method 1
injecting polyurethane liquid between the two end sheets such that the polyurethane liquid fills the shape pattern; and allowing the polyurethane liquid to solidify into polyurethane foam
Data Source
AI summary
An edge trim for display cases, and methods for making edge trim, are described. Instead of using tape or an adhesive to attach trim to the outer rims of end panels, a shape pattern is created in an extruded trim piece. Then polyurethane liquid can be added to the interior of the panel so that it also fills in the shape pattern. When the polyurethane solidifies into foam it will create a tight bond between the panels and the trim pieces.