Stopper Fixing Strength via High-Frequency Wave Adhesion
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Solution Overview
Problem
Conventional airtight and waterproof slide fasteners face issues with the detachment of stoppers due to inadequate fixing strength, especially under severe environments, and the use of adhesive layers complicates the manufacturing process, reducing productivity and increasing costs.
Innovation Solution
A method involving injection molding of a thermoplastic elastomer stopper with a high-frequency wave adhesion portion that embeds the element row and extends outward, ensuring strong adhesion to the airtight and waterproof tape and backing tape piece without the need for adhesive agents, enhancing fixing strength and preventing detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive layers are used to fix the stopper, then fixing strength is improved, but manufacturing process complexity increases and productivity decreases
Solution Approach 1:
The patent removes the adhesive layer from the manufacturing process entirely. Instead of using adhesive to fix the stopper, the invention uses a mechanical retention structure where the stopper is held in place by the fastener elements and tape construction itself, eliminating the need for adhesive application steps and associated complexity
Solution Approach 2:
The patent replaces the chemical bonding mechanism (adhesive) with a mechanical retention system. The stopper is retained through the physical interlocking of fastener elements, tape edges, and stopper geometry, substituting chemical adhesion with mechanical force and structural design
2Strength
If adhesive layers are used to fix the stopper, then fixing strength is improved, but productivity decreases
Solution Approach 1:
By removing the adhesive layer and associated application, drying, and curing steps, the manufacturing process is streamlined. The stopper fixation is achieved through the existing fastener assembly process, eliminating separate operations and improving production speed and efficiency
Solution Approach 2:
The stopper fixation function is merged into the existing fastener element attachment process. The same mechanical assembly that attaches fastener elements to the tape also retains the stopper, combining multiple functions into a single integrated process step
3Ease of manufacture
If the stopper structure is simplified, then ease of manufacture is improved, but fixing strength decreases leading to detachment
Solution Approach 1:
The patent applies local quality by designing specific geometric features at critical locations of the stopper. The stopper has a body portion with specific dimensions and a fin portion with particular shape and position, creating localized stress distribution and mechanical interlocking that enhances fixation strength without complicating the overall structure
Solution Approach 2:
The patent uses composite construction where the stopper body and fin portion work together as an integrated structure. The combination of the body portion embedded in the fastener assembly and the fin portion extending outward creates a composite retention system that achieves high fixing strength through structural composition rather than material complexity
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 high-frequency wave adhesion method significantly increases the fixing strength of the stopper, prevents detachment over time, and simplifies the manufacturing process, maintaining airtightness and waterproof properties even under harsh conditions.
Implementation Method 1
high-frequency wave adhesion portion that embeds the element row
Implementation Method 2
high-frequency wave adhesion method significantly increases the fixing strength
Implementation Method 3
injection molding of a thermoplastic elastomer stopper
Data Source
AI summary
The method for forming a stopper includes injection molding a stopper molding comprising a molding body portion which embeds an end portion of an element row, and a thin fin portion which extends outward from a periphery portion of the molding body portion on at least one end portion side of the element row, and forming a high frequency wave adhesion portion by adhering the fin portion of the stopper molding by a high frequency wave. By this, a fixing strength of the stopper can be increased, and the high frequency wave adhesion portion can be configured to bend easily by making a thickness of the high frequency wave adhesion portion thin, thereby stably forming the stopper which is difficult to detach for a long period of time.