Hidden Slide Fastener Stringer Weave Rigidity
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Solution Overview
Problem
The existing fastener stringers for hidden slide fasteners fail to maintain a predetermined shape under lateral tensile force, leading to gaps between coupled elements and compromising the hiding performance, especially when used in products like automobile seat covers.
Innovation Solution
A fastener stringer design featuring a pair of woven tapes with multiple-weave and single-weave structures in the folded tape portions, along with a binding portion to secure the weave layers, enhancing rigidity and preventing misalignment of warp yarns, thereby maintaining the fastener elements' position and improving hiding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If warp yarn made of synthetic fiber is arranged over the entire region of the reversed portions, then the fastener tape can maintain a predetermined shape, but a gap is formed between the left and right fastener tapes when lateral tensile force is applied, compromising hiding performance
Solution Approach 1:
The patent applies local quality by differentiating the weave structure in different regions of the folded tape portion. Specifically, multiple-weave portions are positioned at locations where warp yarn arrangement is critical for shape maintenance, while single-weave portions are placed in intermediate regions. This localized variation in weave density provides enhanced rigidity exactly where needed to prevent gap formation under lateral tensile force, thereby maintaining hiding performance without requiring synthetic fiber warp yarn throughout the entire reversed portion.
2Strength
If multiple-weave portions are used in the folded tape portion, then rigidity is enhanced and gaps are prevented, but the structure becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the folded tape portion into distinct multiple-weave portions and single-weave portions. This segmentation allows the multiple-weave structure to be implemented only in specific segments where rigidity is most needed, rather than throughout the entire folded tape portion. The single-weave portions act as transitional zones that simplify the overall structure while still providing sufficient rigidity to prevent gap formation between the fastener tapes.
3Ease of manufacture
If warp yarn position is not secured in multiple-weave portions, then manufacturing is simpler, but misalignment occurs compromising hiding performance
Solution Approach 1:
The patent applies the intermediary principle by introducing single-weave portions as mediator structures between multiple-weave portions. These single-weave portions serve as alignment references that secure warp yarn position and prevent misalignment. The binding portions, integrated with the single-weave portions, further reinforce this alignment function. This intermediary approach maintains manufacturing simplicity by using standard weaving techniques while achieving precise warp yarn alignment critical for hiding performance.
Data Source
AI summary
The invention provides a fastener stringer for a hidden slide fastener. Each of the fastener tapes includes a main tape body, a folded tape portion which is folded into a U-shape, and an element attaching portion. The folded tape portion includes at least two multiple-weave portions in which warp yarn forms a multiple-weave structure, and a single-weave portion arranged at least at one location of an intermediate portion of the folded tape portion. According to this, it is possible to enhance rigidity of the folded tape portion in a lateral direction of a tape, and to prevent a position of the warp yarn from being misaligned at the multiple-weave portion. Therefore, hiding performance of the hidden slide fastener can be enhanced.