Elastic Belt Manufacturing with Segmented Force Distribution
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Solution Overview
Problem
Existing methods for manufacturing elastic belts in wearable articles, such as diapers, face challenges in achieving uniform force distribution and tactile sense due to non-uniform layer configurations, which can result in less controllable force profiles and undesirable tactile sensations, while also aiming to minimize material usage without compromising safety.
Innovation Solution
A method involving a front and back elastic belt configuration with a center chassis, where a first layer of continuous sheet and a second layer of discrete continuous sheet are advanced and joined with elastic bodies, allowing for controlled elasticity distribution and minimizing material usage by overlapping the center chassis with the first layer fold over, thereby creating a ring-like elastic belt with dynamic fitment forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a laminate of 2 substrate layers with elastic bodies is used, then the elastic belt can be economically made by joining and deactivating elastic bodies concurrently, but the force distribution and tactile sense become non-uniform across different portions of the belt
Solution Approach 1:
The patent divides the elastic belt into multiple separate elastic bodies positioned at different locations (front waist region, back waist region, leg openings) rather than using a continuous laminate. Each elastic body can be independently controlled and deactivated in specific regions, allowing uniform force distribution while maintaining economical manufacturing through concurrent joining and deactivation processes.
Solution Approach 2:
The patent applies different elastic properties to different portions of the belt by selectively deactivating elastic bodies in specific regions (e.g., deactivating elastic bodies in the crotch region while keeping them active at the waist). This allows each portion of the belt to have the appropriate force characteristics for its specific function, achieving uniform and controlled force distribution across the entire belt.
2Object-affected harmful factors
If one substrate layer is folded over to avoid sharp edges, then safety is improved, but the layer configuration becomes non-uniform resulting in less controllable force profile
Solution Approach 1:
Instead of folding one substrate layer over another to create rounded edges, the patent uses multiple discrete elastic bodies that can be independently positioned and controlled. This segmentation allows the elimination of folded layers while maintaining safety through proper elastic body placement and independent deactivation in specific regions, thereby preserving uniform force profile controllability.
3Quantity of substance
If material usage is minimized for the elastic belt, then cost is reduced, but the assembly effectiveness with center chassis and safety may be compromised
Solution Approach 1:
The patent extracts and eliminates unnecessary substrate layers and excess materials from the elastic belt construction. By using only the essential elastic bodies positioned at critical locations and deactivating them in non-critical regions, the design minimizes material usage while maintaining assembly effectiveness and safety through proper elastic body placement and controlled deactivation.
Solution Approach 2:
The patent applies elastic bodies only where needed (partial action) rather than using a continuous laminate across the entire belt. Elastic bodies are strategically placed in the front waist region, back waist region, and leg openings, and selectively deactivated in regions where elasticity is not required (e.g., crotch region), achieving material minimization while maintaining sufficient elastic force for safety and assembly effectiveness.
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 approach enables the production of wearable articles with improved elasticity distribution and tactile sense, while reducing material usage and ensuring safety by minimizing exposed adhesive and elastic fragments, thus providing a more effective and economical manufacturing process.
Implementation Method 1
a first group of elastic bodies in the machine direction in a stretched state, wherein all of the first group of elastic bodies are intermittently directly joined to the first surface of the first layer of continuous sheet and the first surface of the second layer of discrete continuous sheet
Data Source
AI summary
A method of manufacturing a wearable article is disclosed. The method includes advancing a first layer of continuous sheet and a second layer of discrete continuous sheet having a smaller width than the first layer of continuous sheet; intermittently joining a first group of elastic bodies between the first layer of continuous sheet and the second layer of discrete continuous sheet; joining a second group of elastic bodies to the first layer of continuous sheets outward of the second layer of discrete continuous sheet; joining a center chassis with the first layer of continuous sheet and overlapping the first group of elastic bodies not joined to the first layer of continuous sheet; folding the first layer of continuous sheet to form a first layer fold over, wherein the first layer fold over overlaps the second group of elastic bodies, the center chassis, and the second layer of discrete continuous sheet.