Surface Fastener Masking Structure for Foam-Molding Protection
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Solution Overview
Problem
Existing surface fasteners face challenges in preventing foam resin intrusion into engaging areas during foam-molding, leading to reduced engaging strength, and difficulties in easily peeling off masking members without damaging engaging elements.
Innovation Solution
A surface fastener design featuring a fastener member with a plate-shaped base and protruding engaging elements, where a masking member covers the engaging area and is detachably held, with a space portion between the base and the masking member, allowing for easy peeling and preventing foam resin intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the foam resin intrudes into the engaging area during foam-molding, then the foam body is formed around the engaging elements, but the engaging elements become difficult or impossible to engage to the loops, reducing engaging strength
Solution Approach 1:
The masking member is attached to the fastener member before foam-molding to prevent foam resin intrusion into the engaging area. This preliminary protective action ensures that the engaging elements remain clean and functional after the cushion body is molded, maintaining engaging strength while allowing the foam body to be formed around the engaging elements.
Solution Approach 2:
The masking member acts as an intermediary between the foam resin and the engaging elements. It temporarily covers the engaging area during the foam-molding process, preventing direct contact between the foam resin and engaging elements, and is subsequently removed to reveal clean engaging elements ready for use.
2Manufacturing precision
If the elastomer surrounding portion completely enwraps the engaging elements, then foam resin intrusion is prevented, but the elastomer surrounding portion becomes difficult to peel off from the fastener member
Solution Approach 1:
Instead of completely embedding all engaging elements in the masking member, the invention uses a space portion between the base portion and masking member to allow partial engagement. This partial action approach prevents foam resin intrusion while maintaining ease of peeling, as the masking member is not fully bonded to the fastener member across the entire engaging area.
Solution Approach 2:
The space portion segments the bonding between the masking member and fastener member, creating a controlled separation zone. This segmentation allows the masking member to be easily peeled off after foam-molding, as the bonding is concentrated in specific areas rather than being continuous across the entire engaging area.
3Manufacturing precision
If the engaging elements are completely embedded in the masking member, then foam resin intrusion is prevented, but the engaging elements may be deformed or damaged during peeling
Solution Approach 1:
The space portion enables partial embedding of engaging elements in the masking member rather than complete embedding. This partial action ensures that engaging elements are protected from foam resin intrusion while avoiding excessive bonding that would cause deformation or damage during peeling operations.
Solution Approach 2:
The space portion acts as a cushioning zone between the base portion and masking member, preventing excessive bonding forces from being transmitted to the engaging elements during peeling. This beforehand cushioning protects the engaging elements from deformation or damage while maintaining the protective function against foam resin intrusion.
Data Source
AI summary
The surface fastener includes a base portion, a fastener member that includes a plurality of engagement elements, and a masking member that is detachably held by the fastener member. The masking member covers an engaging area of the fastener member, at least a part of the engaging element is embedded in the masking member. A space portion is provided between the base portion and the masking member in the engaging area. Thus, a foam resin can be prevented from intruding the engaging area of the fastener member in foam-molding of the cushion body. The masking member is also easily peeled off from the fastener member after foam-molding.