Slide Fastener Tape with Interposed Flap for Sewing
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Solution Overview
Problem
The existing methods for sewing a fastener tape to a flexible member require a level of skill and burden, particularly due to the need for using bias tape to conceal the sewn parts, which increases material costs and operational complexity.
Innovation Solution
A slide fastener system with a fastener tape that includes distinct tape regions with varying thickness and weave structures, allowing the flap of the flexible member to be interposed between these regions for easier sewing and concealment, reducing the need for bias tape and simplifying the sewing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If bias tape is used to conceal the sewn parts of the fastener tape and flexible member, then the appearance is improved and side-edge portions are covered, but the sewing process becomes more complex and requires higher skill level
Solution Approach 1:
The fastener tape integrates the concealing function directly into its structure by incorporating a second tape region with different thickness and weave density. This merges the fastening function and the concealing function into a single component, eliminating the need for separate bias tape and simplifying the sewing process while maintaining the appearance improvement.
2Shape
If bias tape is used to conceal the sewn parts, then the side-edge portions are covered, but material costs and operational burden increase
Solution Approach 1:
The fastener tape serves multiple functions simultaneously: it provides the fastening function through its fastener elements and the concealing function through its second tape region. This multi-functionality eliminates the need for additional bias tape material, reducing material costs and operational burden while achieving the desired concealment of side-edge portions.
3Ease of manufacture
If a uniform thickness fastener tape is used, then the manufacturing is simpler, but the folding and interposing of the flap becomes difficult
Solution Approach 1:
The fastener tape incorporates regions of different thickness within the same tape structure. The second tape region has different thickness compared to the first tape region, creating local variations that facilitate folding and interposing of the flap while maintaining overall manufacturing simplicity through a single tape component.
Data Source
AI summary
Slide fastener coupled to flexible member includes: a pair of fastener stringers, each of the fastener stringers having a fastener tape provided with a first side-edge portion and a second side-edge portion which extend in an elongation direction of the fastener tape, and a fastener element provided on the first side-edge portion side; and one or more sliders for opening and closing the pair of fastener stringers. The fastener tape includes a first tape region onto which a flap of the flexible member is overlaid and a second tape region positioned between the first tape region and the second side-edge portion. The flap is interposed between the first tape region and the second tape region.