Frangible Bonding Agent for Disposable Absorbent Article Fastening
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Solution Overview
Problem
Disposable absorbent articles face challenges in maintaining a fastening system configuration during high-speed manufacturing due to mechanical fastening systems extending beyond the article edges, leading to contamination and damage, and conventional adhesives provide excessive bond strength that complicates consumer use by making it difficult to unfold or reposition the fastening system.
Innovation Solution
A disposable absorbent article with a fastening system using a frangible bonding agent, such as a fugitive hot-melt adhesive, applied to specific portions of the mechanical fastening system to maintain the folded configuration during manufacturing and reduce bond strength for easy consumer use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a permanent bonding agent is used to maintain the fastening system in a folded configuration during manufacturing, then the bond strength is sufficient to prevent damage and contamination, but the bond becomes too strong for consumer use making it difficult to unfold or reposition the fastening system
Solution Approach 1:
The patent applies a frangible bonding agent that changes its bonding parameters over time. Initially, the bonding agent provides strong adhesion to maintain the fastening system in a folded configuration during high-speed manufacturing. Over time, the bond strength decreases to a frangible state that allows easy unfolding by consumers. This temporal parameter change resolves the contradiction between needing strong bonds during manufacturing and easy separation during consumer use.
2Strength
If conventional adhesives are used to increase bond strength of the mechanical fastener, then the fastening system remains securely folded during manufacturing, but the refastenability of the mechanical fastener is reduced due to coverage of engageable portions
Solution Approach 1:
The frangible bonding agent is applied selectively to specific portions of the mechanical fastening system rather than uniformly across all surfaces. This localized application ensures that bonding strength is provided where needed to maintain the folded configuration, while leaving other areas free to maintain their mechanical fastening functionality and refastenability. The engageable portions of the mechanical fastener remain accessible for consumer use.
3Ease of manufacture
If the fastening system extends laterally outwardly beyond the side edges of the article, then the mechanical fastening system can be properly configured, but the risk of contamination or damage to the article and manufacturing equipment increases
Solution Approach 1:
The fastening system is pre-configured in a folded state before the manufacturing process begins. The frangible bonding agent is applied to maintain this folded configuration during manufacturing, preventing the laterally extending portions from contacting manufacturing equipment and causing contamination. This preliminary folding action eliminates the harmful effects during production while allowing proper fastening system configuration.
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 frangible bonding agent ensures the fastening system remains securely folded during manufacturing while allowing easy opening by consumers, maintaining the desired bond strength and refastenability without interfering with the mechanical fastening system's functionality.
Implementation Method 1
a bonding agent such as an adhesive may be applied to one or more portions of the mechanical fastener prior to folding and/or engaging the fastening system
Implementation Method 2
at higher temperatures the flowability of the hot-melt adhesive increases enough for it to penetrate further into the pores or capillaries of the substrate
Data Source
AI summary
A disposable absorbent article that includes a frangible bonding agent for maintaining the absorbent article in a predetermined configuration. The frangible bonding agent may be disposed on a fastening system in order to maintain one or more portions of the fastening system in a particular position during manufacturing but still provide an easy-to-open fastener when used by a consumer.