Molded Surface Fastener with Thickened Adhesion Zone
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Solution Overview
Problem
Molded surface fasteners with partial joint attachments to cushion bodies are prone to detachment under tension, leading to peeling issues due to insufficient adhesion strength between the back member and the base portion.
Innovation Solution
A molded surface fastener design featuring a plate-shaped base portion with distinct thickness regions, where the back member is securely attached to a thicker second base region, allowing synthetic resin to penetrate and enhance adhesion, while maintaining flexibility by not adhering to the thinner first base region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the back member is attached using a partial joint portion to the base portion, then the flexibility of the molded surface fastener is ensured, but the adhesion strength between the back member and base portion is insufficient, causing detachment under tension
Solution Approach 1:
The base portion is designed with different thickness regions: a first base region with smaller thickness for flexibility and a second base region with larger thickness for strong adhesion. This local variation in thickness allows different parts of the same component to serve different functions - the thinner region maintains flexibility while the thicker region provides robust attachment for the back member
2Strength
If the back member is attached to the whole of the second surface of the base portion, then the adhesion strength is improved, but the flexibility of the molded surface fastener is reduced and cracks may form
Solution Approach 1:
Instead of uniformly attaching the back member across the entire base portion, the invention selectively attaches it only to the second base region with larger thickness. This localized attachment strategy ensures that the back member gains strong adhesion where needed while the first base region with smaller thickness remains unattached, preserving the overall flexibility of the molded surface fastener
3Quantity of substance
If the back member is partially joined to the base portion, then material costs are reduced, but the secured state becomes unstable under tension from covering material
Solution Approach 1:
The invention strategically places the back member attachment in the second base region with larger thickness, which provides sufficient adhesion strength to maintain stability under tension from covering material. This targeted approach uses material efficiently by concentrating attachment resources where they provide maximum structural benefit rather than distributing them uniformly across the entire base portion
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 design significantly increases the adhesion strength of the back member to the fastener member, preventing peeling and ensuring a stable secured state, even under tension, while minimizing material costs and maintaining flexibility.
Implementation Method 1
the back member has a structure enabling the synthetic resin to pass from the first surface to the second surface of the back member
Data Source
AI summary
The molded surface fastener includes: a fastener member that has a plurality of engagement elements disposed upright on the first surface of a base portion, and a back member that is secured to the second surface of the fastener member and that is provided with a structure enabling passage of a synthetic resin. The base portion has a first base region of a predetermined thickness and a second base region formed to be thicker than the first base region, and the back member is secured to at least the second base region of the base portion. The adhesion strength of the back member to the fastener member is thus increased, enabling the back member to be held more firmly by the base portion.