Elastic Strand Spool Switching for Continuous Laminate Assembly
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Solution Overview
Problem
High-speed manufacturing processes for absorbent articles face inefficiencies and disruptions due to the need to frequently replace empty spools of elastic strands, leading to temporary stops in production.
Innovation Solution
A method and apparatus that allows for seamless transition between spools of elastic strands by unwinding from multiple spools simultaneously, ensuring continuous production without stopping the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If elastic strands are drawn from rotating spools on a surface unwinding device, then the elastomeric laminate can be manufactured, but the production line must be temporarily stopped when spools are depleted
Solution Approach 1:
The patent employs multiple spools arranged in parallel on the surface unwinding device, allowing the system to switch between spools seamlessly. When one spool is depleted, another can immediately take over without interrupting the manufacturing process, thereby maintaining continuous production and eliminating downtime associated with spool replacement.
Solution Approach 2:
The patent divides the elastic strand supply into multiple separate spools instead of relying on a single spool. This segmentation allows independent operation and replacement of each spool, enabling the manufacturing line to continue using remaining spools while others are being replaced, thus maintaining overall production continuity.
2Reliability
If multiple spools are used to enable seamless transition, then production continuity is improved, but the device complexity increases
Solution Approach 1:
The surface unwinding device is designed with a universal structure that can accommodate multiple spools of different sizes and configurations. The device performs the same unwinding function for each spool simultaneously, providing multi-functionality without requiring separate unwinding mechanisms for each spool, thus managing complexity efficiently.
Solution Approach 2:
The patent combines multiple spools and their unwinding operations into a single integrated surface unwinding device. Instead of having separate unwinding mechanisms for each spool, the device merges all unwinding functions into one unit, simplifying the overall system architecture while maintaining the ability to switch between multiple spools seamlessly.
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
Enables uninterrupted manufacturing of elastomeric laminates by switching from one spool to another without halting the production line, enhancing efficiency and reducing downtime.
Implementation Method 1
positioning the outer circumferential surface of each first spool in rolling contact with a first roll; positioning the outer circumferential surface of each second spool in rolling contact with a second roll; unwinding elastic strands from the first spools by advancing the elastic strands from between each first spool and the first roll
Data Source
AI summary
The present disclosure relates to methods for assembling elastomeric laminates, wherein elastic material may be stretched and joined with either or both first and second substrates. First spools are rotated to unwind first elastic strands from a first unwinder in a machine direction. The first elastic strands are positioned between the first substrate and the second substrate to form an elastomeric laminate. Before the first elastic strands are completely unwound from the rotating first spools, second spools are rotated to unwind second elastic strands from a second unwinder. Subsequently, the advancement of the first elastic strands from the first unwinder is discontinued. Thus, the elastomeric laminate assembly process may continue uninterrupted while switching from an initially utilized elastic material drawn from the first spools to a subsequently utilized elastic material drawn from the second spools.