Surface Modified Hook Fastener Microprotrusions
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Solution Overview
Problem
Existing mechanical fastening systems for disposable absorbent products, such as diapers and feminine hygiene products, often cause damage to clothing through abrasion, fiber pull-out, or snagging due to the engagement of microprotrusions with textile materials, especially during multiple uses.
Innovation Solution
The male component of a mechanical fastening system is surface modified using techniques such as coating with an attachment modifying composition or heat treatment to reduce damage by altering the shape, plasticity, and surface energy of microprotrusions, making them less likely to cause damage while maintaining effective engagement with textile materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microprotrusions are used as the male component of a mechanical fastening system, then engagement capability with textile materials is improved, but damage to the female component (abrasion, fiber pull-out, snagging) increases during multiple engagements
Solution Approach 1:
The patent applies parameter changes by modifying the surface properties of microprotrusions through coating with composition 34 (containing lubricant or release agent) or heat treatment. This changes the friction coefficient and surface energy of the protrusions, allowing them to engage textile materials effectively while reducing harmful interactions during multiple engagements, thus resolving the contradiction between engagement capability and damage prevention
Solution Approach 2:
The patent introduces an intermediary substance (coating composition 34 containing lubricant or release agent) between the microprotrusions and the female component. This intermediary layer reduces direct mechanical contact and friction, preventing fiber pull-out and snagging while maintaining engagement capability, thereby resolving the technical contradiction
2Strength
If conventional hook elements with specially shaped engaging means are used, then engagement strength is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts and eliminates the need for specially shaped engaging means (hooks, caps, spherical shapes) by using simple microprotrusions instead. The engagement strength is achieved not through complex geometry but through surface modification of simple cylindrical protrusions, thus reducing device complexity while maintaining engagement strength
Solution Approach 2:
The patent changes the surface parameters (friction coefficient, surface energy) of simple microprotrusions through coating or heat treatment to achieve adequate engagement strength without requiring complex geometries, thereby resolving the contradiction between engagement strength and device simplicity
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 surface modification of microprotrusions reduces damage to clothing during engagement and disengagement, preventing abrasion and fiber pull-out, while ensuring secure attachment and easy release without significant distortion to the female component.
Implementation Method 1
The technique can change the composition, the physical characteristics, and/or the structure of the surface of the protrusion. For instance, in one embodiment, an attachment modifying composition can be used to coat the protrusions.
Implementation Method 2
In still another embodiment, the protrusions may be subjected to a heat treatment. For instance, the protrusions may be heated to a temperature greater than the glass transition temperature of the polymeric material used to form the protrusions.
Data Source
AI summary
A mechanical fastener is disclosed. The mechanical fastener generally comprises the male component of a hook and loop fastening system. The male component contains a plurality of protrusions that have been surface modified. In particular, the protrusions have been surfaced modified in a manner that prevents damage to a female component during engagement and disengagement but yet still forms a firm attachment with the female component.