Modular Roofing Sheet Crease Geometry for Stiffness and Coating Protection
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Solution Overview
Problem
Traditional modular roofing sheets face issues such as micro-cracks, corrosion, low transverse stiffness, sheet corrugation, and wind uplift due to limited bending radii and angles, leading to inefficient assembly and increased material consumption.
Innovation Solution
A modular roofing sheet design featuring double-bend creases and smaller bending radii to distribute stress, enhance stiffness, and improve aerodynamics, with pre-prepared mounting features for easy assembly and reduced material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If bending at 90° angle is used to form modular roofing sheets, then the sheets can be manufactured with standard bending technology, but micro-cracks occur in lacquer and corrosion-proof coatings due to stress concentration
Solution Approach 1:
The roofing sheet is divided into multiple modules with individual bending elements. Each module can be bent independently at a larger radius, distributing the stress across multiple segments rather than concentrating it at a single 90° bend, thereby preventing micro-cracks in the lacquer coating while maintaining manufacturability
Solution Approach 2:
The patent employs curved bending elements with larger bending radii instead of sharp 90° angles. This curvature distributes tensile stresses over a larger area, preventing stress concentration that causes lacquer cracking, while still achieving the necessary geometric form for modular roofing sheets
2Ease of manufacture
If minimal bending radius 2T is adopted according to producer recommendations, then the bending process is simplified, but new shapes of modular roofing sheets cannot be developed
Solution Approach 1:
The patent changes the bending radius parameter from the minimal 2T to larger values (e.g., 5T, 10T or more). This parameter change enables the formation of diverse shapes and profiles while maintaining ease of manufacture, as the larger radii allow for smoother transitions and greater design flexibility without complicating the bending process
3Shape
If modular roofing sheets have low profile with many even surfaces, then the aesthetic appearance is improved, but transverse stiffness becomes insufficient
Solution Approach 1:
The patent introduces localized reinforcing elements such as ribs, ledges, and varying thickness sections at critical locations. These local quality changes provide additional stiffness where needed to prevent deformation and water retention, while maintaining the overall low-profile aesthetic appearance of the roofing sheet
4Ease of manufacture
If traditional roofing sheet designs are used, then manufacturing is straightforward, but wind loads are increased due to poor aerodynamics
Solution Approach 1:
The patent employs curved and streamlined profiles instead of flat traditional designs. The curved surfaces improve aerodynamics by reducing wind pressure and uplift forces, while the manufacturing process remains straightforward using standard bending and forming techniques, achieving both ease of manufacture and reduced wind load
Data Source
AI summary
A roof covering element, a modular roofing sheet, made of a plate material, consisting of a first and second side edge, an upper edge and a lower edge, having a series of modules substantially parallel to the side edges forming at least one surface, containing ribs (walls) parallel to the upper and lower edges, characterised by that between an upper wall (5) and an ending surface (4) of the roof covering element (1) there is an upper crease (8) forming an obtuse angle with the ending surface (4) of the roof covering element (1); between each of {n} central walls (6) and each of {n} surfaces (3) there is a central crease (9) forming an obtuse angle with a central wall (6) and an obtuse angle with the surface (3); between a lower wall (7) and an extreme lower surface (2) there is a lower crease (10) forming an obtuse angle with the lower wall (7) and an obtuse angle with the extreme lower surface (2), wherein n is a natural number of n>0.