Double-Layer Fastener Edge for Waterproof Concealed Zippers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing slide fasteners attached to products like clothing or bags face issues with waterproofing due to the fastener tape being exposed between the fastener-receiving member and elements, requiring dedicated materials and complicating manufacturing, which affects design and appearance quality.
Innovation Solution
A slide fastener-attached product design with a double-layer portion on the stringer attachment edge, where the fastener tape is sewn away from the fastener elements, and a bent portion is in contact with them, forming a waterproof region, using water-repellent sewing threads and adhesive layers to secure the fastener tape under the double-layer portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fastener tape is sewn together with the fastener-receiving member using a conventional sewing process, then the fastener tape can be attached to the product, but the fastener tape becomes exposed in the region between the fastener-receiving member and the fastener elements, compromising waterproof performance and design quality
Solution Approach 1:
The stringer attachment edge is divided into a first strip portion, a bent portion, and a second strip portion. The sewn portion is positioned between the first and second strip portions, while the bent portion contacts the fastener elements. This segmentation creates a waterproof region that prevents liquid penetration without requiring complex additional components.
2Reliability
If a dedicated waterproof fastener tape is used to prevent exposure and ensure waterproofing, then waterproof performance is improved, but manufacturing costs increase and production becomes more complicated
Solution Approach 1:
The stringer attachment edge is pre-formed with a double-layer structure including a bent portion that will contact the fastener elements. This preliminary structural preparation enables the creation of a waterproof region during the normal sewing process, eliminating the need for specialized waterproof fastener tapes while maintaining waterproof performance.
3Shape
If the fastener tape is made non-visible to improve design quality, then appearance quality is enhanced, but this requires the fastener tape to be waterproof which increases manufacturing complexity
Solution Approach 1:
The solution moves from requiring the fastener tape itself to be waterproof (material property) to creating a waterproof region through the spatial arrangement of the double-layer stringer attachment edge (structural configuration). The bent portion extending toward the fastener elements creates a covering effect that hides the fastener tape while the waterproof region ensures liquid prevention.
Data Source
AI summary
A slide fastener-attached product includes a fastener stringer and a fastener-receiving member. The fastener stringer is attached to a stringer attachment edge of the fastener-receiving member with a sewn portion. The stringer attachment edge includes a double-layer portion including a first strip portion, a bent portion, and a second strip portion. The sewn portion is disposed away from a plurality of fastener elements, and the bent portion is disposed in contact with or closer to the fastener elements. A waterproof region is formed between the sewn portion and the fastener elements. In the slide fastener-attached product, exposure of the fastener tape in the region between the fastener-receiving member and the fastener elements can be prevented or reduced.