Elastic Strand Unwind Module for Diaper Panel Production
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Solution Overview
Problem
Current processes for making elastic panels in diapers face issues such as elastic strand breakage due to friction and tension, difficulty in detecting broken strands, and inefficient use of floor space for unwinding and lamination modules.
Innovation Solution
The proposed solution includes an elastic unwind module with a modular design, motor-driven rollers, and a pressure roller to reduce friction and breakage, a vision system for detecting broken strands, and a lamination module with improved adhesive application and folding mechanisms to optimize panel production while minimizing floor space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastic strands are fed through a circuitous route with yarn guide rollers and tension sensors, then tension can be monitored, but friction increases causing elastic strand breakage
Solution Approach 1:
The patent replaces the mechanical yarn guide rollers and tension sensors with an optical sensing system. Cameras and image processing algorithms detect elastic strand position and tension without physical contact, eliminating friction-induced breakage while maintaining monitoring capability
Solution Approach 2:
The patent introduces vision system technology as an intermediary between the elastic strands and the monitoring system. Optical fields serve as the intermediary medium to detect strand status without mechanical contact, resolving the contradiction between monitoring needs and friction avoidance
2Productivity
If multiple tree-like stands are placed on the floor for elastic strand unwinding, then elastic strands can be fed to the lamination module, but floor space is excessively consumed
Solution Approach 1:
The patent transitions from a floor-based horizontal layout to a vertical three-dimensional configuration. The elastic unwind module is positioned above the lamination module, with elastic strands fed vertically downward, utilizing vertical space instead of horizontal floor space to maintain productivity while minimizing footprint
Solution Approach 2:
The patent nests the elastic unwind module vertically above the lamination module, creating a compact stacked configuration. The core stand with elastic strand cores is positioned in the vertical dimension above the processing area, allowing nested arrangement that reduces overall floor space occupation
3Ease of manufacture
If hot melt adhesive is applied to nonwoven webs, then elastic strands can be attached, but adhesive bleed-through occurs in porous lighter basis weight nonwoven webs
Solution Approach 1:
The patent changes the physical state parameter of the adhesive from hot melt (liquid/semi-liquid) to powder form. This parameter change allows the adhesive to be applied as a controlled powder coating that does not bleed through porous nonwoven webs, while still providing effective bonding when activated
Solution Approach 2:
The patent changes the application method parameter from liquid flow through heated heads to powder dispensing. This allows precise control of adhesive placement and quantity, preventing bleed-through in lighter basis weight nonwoven materials while maintaining ease of manufacture
4Reliability
If adhesive is cooled with chilled water after application, then adhesive sets properly, but operating costs increase and water leakage problems occur
Solution Approach 1:
The patent replaces the thermal cooling system with chilled water with a mechanical activation system. Powder adhesive is applied without heating or cooling, and bonding is achieved through mechanical activation methods such as pressure or chemical triggers, eliminating water-related harmful effects while maintaining reliable adhesive setting
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 solution significantly reduces elastic strand breakage, simplifies the re-stringing process, and minimizes downtime, while also optimizing floor space and improving the efficiency of adhesive application and panel folding.
Implementation Method 1
motor driven rollers; and a pressure roller that rests upon the motor driven rollers
Data Source
AI summary
A system for manufacturing elastic strand nonwoven panels including an unwind module, a lamination module and a folding module. Elastic strand material is fed from cores disposed on the unwind module through rollers towards the lamination module, where the elastic strand material is attached to a nonwoven web to form an elastic strand nonwoven web. At the folding module, the elastic strand nonwoven web is folded over itself by operation of plates underneath which the elastic strand nonwoven web is fed under tension.