Waterproof Fastener Stringer Weave for Gap-Free Film Lamination
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Solution Overview
Problem
The appearance of waterproof stringers is deteriorated due to gaps formed between the waterproof film and the ground structure of fastener tape, leading to a whitish appearance, and increasing the adhesive amount results in increased hardness and reduced softness.
Innovation Solution
A waterproof stringer with a fastener tape woven from weft and warp threads, a coil-like element sewn to the tape, and a waterproof film laminated on the opposite side, featuring a twill weave with floating portions and hollows between ribs to enhance surface flatness and appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If adhesive amount is increased to fill gaps between waterproof film and ground structure, then appearance is improved, but hardness increases and softness is reduced
Solution Approach 1:
The ground structure is designed with local variations in thickness and density. The adhesive layer thickness is controlled to be different in different regions: thinner in areas where the waterproof film contacts the ground structure directly, and thicker in gap areas. This local differentiation allows adequate adhesive filling for appearance without excessive adhesive application that would harm softness.
Solution Approach 2:
Instead of applying adhesive uniformly across the entire bonding surface, the invention applies adhesive selectively only in regions where gaps exist between the waterproof film and ground structure. This partial action approach fills appearance-deteriorating gaps while avoiding excessive adhesive in areas where it would increase hardness and reduce softness.
2Shape
If adhesive amount is increased to fill gaps, then gaps are reduced, but adhesive cost and processing complexity increase
Solution Approach 1:
The ground structure is pre-designed with specific thickness variations and structural features before adhesive application. The pressing conditions (pressure distribution, temperature, time) are predetermined and optimized based on pre-analyzed gap patterns. This preliminary preparation enables effective gap filling with controlled adhesive amounts without requiring complex real-time monitoring or adjustment systems during the bonding process.
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 solution improves the appearance of the waterproof stringer by minimizing gaps and unevenness, maintaining softness while ensuring adequate waterproofness without increasing adhesive usage.
Implementation Method 1
a waterproof film laminated onto a tape top surface of the fastener tape on an opposite side of the coil-like element
Data Source
AI summary
Fastener stringer includes: a fastener tape; a fastener element arranged on a side edge portion of the fastener tape; and a covering member made of soft material and covering the fastener tape, the covering member comprising a sealing portion positioned on an opposite side of the fastener element with respect to the fastener tape in a thickness direction of the fastener tape. The covering member includes a flexible core sheet extending in a longitudinal direction of the fastener stringer. The core sheet is embedded in the soft material such that one surface of the core sheet is at least partially exposed or both surfaces of the core sheet are not exposed.