Garage Door Panel Composite Structure
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Solution Overview
Problem
Conventional garage door panels are heavy and noisy, and they require both sides to be made of metal for structural integrity, which is inefficient and costly.
Innovation Solution
A garage door panel design featuring a formed metal section with a polystyrene center retained by a twin wall polypropylene section and a polyurethane foam backing, where the polypropylene section is affixed using hot melt glue, and the polyurethane foam is formed from isocyanate and polyol resin, reducing the need for metal on both sides and providing a lightweight, rigid structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If both sides of the garage door panel are made of metal, then structural integrity is maintained, but weight and noise increase
Solution Approach 1:
The patent applies composite materials by combining metal sections with polypropylene and polystyrene components. The metal sections provide structural integrity at the edges and connection points, while the polypropylene and polystyrene sections reduce overall weight and noise compared to fully metal construction. This composite approach maintains necessary strength while achieving weight reduction.
2Strength
If both sides of the garage door panel are made of metal, then structural integrity is maintained, but material cost increases
Solution Approach 1:
The patent reduces metal material usage by substituting metal sections with polypropylene and polystyrene components in non-critical areas. The metal is concentrated only where structurally necessary (edges, connection points), while the polymer sections replace metal in areas where lower strength is acceptable, thereby reducing overall metal consumption and cost.
Solution Approach 2:
The patent applies local quality by varying material distribution throughout the panel structure. Metal sections are strategically placed only where high strength is required (perimeter, connection zones), while polypropylene and polystyrene sections are used in areas where lower strength is sufficient. This localized material assignment optimizes both structural integrity and material efficiency.
3Weight of moving object
If metal sections are reduced to one side only, then weight and cost are reduced, but structural integrity may be compromised
Solution Approach 1:
The patent compensates for reduced metal content by incorporating polypropylene and polystyrene components that provide structural support. The polypropylene section acts as a rigid framework that maintains panel shape and strength, while the polystyrene sections provide additional support and insulation. This composite structure achieves weight reduction while maintaining necessary structural integrity through the combined properties of different materials.
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 results in a lightweight, noise-reducing, and rigid garage door panel with improved insulation and stability, as the polyurethane foam provides structural support while minimizing metal usage, thus enhancing operational efficiency and reducing material costs.
Implementation Method 1
The rear surface of the formed metal section is spray coated with a combination isocyanate and polyol resin which combines to form as hardened polyurethane foam section
Implementation Method 2
The front surface of the twin wall polypropylene is affixed by adhesive such as glue to the rear surface of the polystyrene section
Data Source
AI summary
An apparatus for a garage door panel which includes a formed metal section with at least one decorative portion on the front surface and having a rear surface. The formed metal section including a top portion with a male tongue and a bottom portion with a female groove. The garage door panel includes an insert combination of a polystyrene section and twin wall polypropylene section. The rear surface of the formed metal section is spray coated with a combination isocyanate and polyol resin which combines to form as hardened polyurethane foam section. The front surface of the polystyrene section is retained against the polyurethane foam section and the rear surface of the twin wall polypropylene serves as the rear surface of the garage door panel. Two metal stiles are respectively affixed at the left or first end and the right or second end.