Zip Fastener End Stop Moulding for Seamless Finish
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Solution Overview
Problem
Existing methods for forming end stops on zip fasteners, particularly waterproof ones, often result in unsatisfactory shapes and uneven finishes, especially when using continuous coil coupling elements, which can be uncomfortable and aesthetically unpleasing.
Innovation Solution
The formation of a closed or open end stop by cutting away the fastener tape edges to create an enlarged gap, followed by moulding a compatible material, such as polyurethane, to extend over the tape surfaces and encapsulate the coupling elements, providing a seamless and comfortable finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If melting coupling elements is used to form an end stop, then the end stop can be formed without additional components, but the shape of the end stop becomes unsatisfactory and the finish is uneven
Solution Approach 1:
The invention separates the coupling element formation from the end stop formation. The continuous coil coupling elements are stopped at a specific point, and a separate molded end stop component is attached to complete the fastener end. This segmentation allows each component to be optimized independently for its specific function.
Solution Approach 2:
The invention combines multiple components (coupling elements, end stop molded piece, and optional reinforcement) into a unified fastener assembly. The end stop molded piece is integrated with the coupling elements through mechanical attachment, creating a combined structure that provides both coupling functionality and a finished end stop.
2Ease of manufacture
If a gap is formed by cutting away coupling elements to facilitate end stop attachment, then the end stop can be properly attached, but the manufacturing process becomes more complex
Solution Approach 1:
The continuous coil coupling elements are pre-formed and stopped at a predetermined point before the end stop is attached. This preliminary action creates the necessary space for end stop attachment without requiring post-assembly cutting or modification, simplifying the overall manufacturing process.
Solution Approach 2:
The end stop molded piece acts as an intermediary component that bridges the gap between the coupling elements and the fastener end. It provides a transition structure that facilitates proper attachment while maintaining the integrity of both the coupling elements and the fastener tape.
3Productivity
If traditional end stop methods are used, then the fastener can be manufactured, but the surface is uneven and visually imperfect
Solution Approach 1:
The invention changes the physical and chemical parameters of the end stop material through molding processes. The molded piece is formed with specific material properties (flexibility, adhesion characteristics) that allow it to conform to the fastener tape and coupling elements, creating a smooth, even surface finish.
Solution Approach 2:
The end stop assembly uses composite construction combining the continuous coil coupling elements (typically polyester or nylon) with a molded end stop piece (typically polyurethane or similar flexible polymer). This composite structure provides both functional and aesthetic benefits, including a smooth finished surface.
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
This method ensures a watertight seal, enhances the grip of the slider, and provides a smooth, even surface, eliminating the discomfort and visual imperfections caused by traditional end stop methods.
Implementation Method 1
moulding a compatible material, such as polyurethane, to extend over the tape surfaces and encapsulate the coupling elements
Data Source
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AI summary
A zip fastener comprises a pair of tapes and coupling elements along adjacent edges of the tapes. The tapes are partly cut away to form a gap into which an end stop is moulded. The end stop is provided so as to extend along the tape edges away from the fastener coupling elements.