Metal Box Sandwich Structure for Rigidity
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Solution Overview
Problem
Metal boxes used for packaging fragile or luxury items lack rigidity, leading to deformation and a 'hollow shell' sound when handled, which detracts from the perceived value of the product.
Innovation Solution
A method of manufacturing boxes with at least three partially rigid side flaps obtained by folding a metallic sheet and shaping a second metallic sheet, incorporating a sandwich structure with outer metal layers and a securing material, such as an adhesive or elastic material, distributed over the entire surface to enhance rigidity and prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If metal sheets are joined by crimping and stapling, then the box can be manufactured with simple mechanical processes, but the walls lack rigidity and deform when handled
Solution Approach 1:
The patent applies composite materials by creating a sandwich structure with at least two outer metallic sheets and a bonding material layer between them. This composite construction provides significantly enhanced rigidity and strength compared to simple crimped metal sheets, while maintaining manufacturability through standardized assembly processes.
Solution Approach 2:
The patent transitions from two-dimensional sheet metal joining to three-dimensional sandwich structure assembly. By adding the bonding material layer between outer sheets, the structure gains dimensional complexity that translates to improved mechanical properties, particularly resistance to deformation.
2Ease of manufacture
If metal sheets are joined by crimping, then the manufacturing process is simple, but the box produces hollow sound and lacks luxurious appearance
Solution Approach 1:
The sandwich structure with bonding material fills the hollow cavity between metal sheets, eliminating the hollow sound characteristic of thin-walled metal boxes. The composite construction provides solid mass that prevents the characteristic hollow resonance while maintaining manufacturing efficiency.
3Weight of moving object
If standard thickness metal sheets are used, then the material cost and weight are controlled, but the box sides deform and sink when handled
Solution Approach 1:
The sandwich structure achieves high strength-to-weight ratio by distributing load across multiple layers. The bonding material acts as a structural core that prevents local deformation, allowing the use of thinner outer sheets that would otherwise be too flexible, thus controlling weight while improving deformation resistance.
Solution Approach 2:
By transitioning from single-layer to multi-layer construction, the patent achieves improved mechanical properties without proportionally increasing weight. The bonding material layer adds structural support in the third dimension, preventing sheet deformation while maintaining overall compactness.
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 method achieves levels of rigidity comparable to wood or injected plastic, reducing deformation and rattling noises, while maintaining decorative capabilities, thus enhancing the product's perceived value.
Implementation Method 1
a bonding material disposed between the two sheets, the bonding material being distributed substantially over the entire surface of each of said side panels
Data Source
Figure 1
Figure 2.1~2.6
Figure 3a~4
AI summary
The invention relates to a method for manufacturing a box (1) having at least three at least partially rigid side flaps (8), said at least three side flaps (8) being obtained by folding at least one first sheet (16), said method comprising the following steps of: shaping at least one second sheet (16); applying a layer of securing material (20) to a surface of at least one part of said first sheet (16); positioning said at least one second sheet (16) on said part of said first sheet (16) covered with said securing material (20) in order to obtain a sandwich structure (13).