Rucksack Overlap Welding Tool for Complex Curved Shapes
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Solution Overview
Problem
Existing methods for producing rucksacks and containers with complex, curved designs using continuous welding techniques result in poor weld seam quality and significant production challenges, limiting the ability to create stable and waterproof bags with desired shapes.
Innovation Solution
A backpack or container design featuring a 3-dimensional weld seam created using overlap welding with a tool that spans the base body circumference, incorporating extended perimeter edge projections for a figure-eight or similar shape, with a longitudinal zipper and high-frequency weld seam, allowing for complex and functional designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If continuous welding techniques are used to produce rucksacks with curved designs, then design flexibility and shape complexity are improved, but weld seam quality deteriorates
Solution Approach 1:
The welding process is divided into multiple discrete weld segments instead of continuous welding. The tool makes discrete welding movements along the perimeter edge, creating individual weld segments that are then joined together. This segmentation allows each weld segment to be precisely controlled while maintaining the ability to create complex curved paths, resolving the contradiction between design flexibility and weld seam quality.
2Reliability
If the tool spans the base body circumference for welding, then waterproof integrity is improved, but device complexity increases
Solution Approach 1:
The welding tool is designed to move in multiple dimensions - it can span the base body circumference while also making discrete welding movements along the perimeter edge. The tool's ability to operate in both the circumferential dimension and the welding path dimension allows it to create comprehensive weld coverage for waterproof integrity while maintaining a relatively simple tool structure through modular design.
3Shape
If extended perimeter edge projections are used for welding segments, then shape complexity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The extended perimeter edge projections are pre-formed on the base body before the welding process begins. These projections serve as predetermined locations and guides for the welding segments, ensuring proper alignment and positioning. By preparing the welding locations in advance through the projection formation, the actual welding process can focus on creating high-quality weld segments without the added complexity of simultaneous positioning and welding, thus resolving the precision challenge.
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
Enables the production of stable and waterproof bags with complex, curved shapes, overcoming previous limitations in weld seam quality and design flexibility, while maintaining a high level of waterproof integrity.
Implementation Method 1
the weld seam itself is a 3-dimensional weld seam with different inclinations and this is preferably designed as a high-frequency weld seam
Data Source
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AI summary
The invention relates to a rucksack (1), bag or container made of flexible, coated, waterproof and/or non-waterproof materials and which consist of parts that are welded, by overlapping welding, by a tool. The external contours of the tool clamp over the periphery of the base body and the edge becomes part of the overlapping weld seam (2) in the form of a bead. The overlapping weld seam (2) extends along the edge of the periphery (3) and at least one area (4) of the edge of the periphery (3) is longer and the overlapping weld seam (2) in said area (4) is correspondingly further away from the peripheral line (3).