Vacuum Anvil Tape Applicator for Asymmetrical Diaper Tab Placement
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Solution Overview
Problem
Existing applicators for attaching tape tabs to traveling webs in disposable diaper manufacturing face issues such as difficulty in feeding tape webs with low axial stiffness, contamination leading to registration and cut accuracy problems, and inability to handle complex tape configurations or non-uniform tab placement, resulting in inefficiencies and noise.
Innovation Solution
A rotary knife or die with vacuum anvil cylinder system that feeds tape webs at matching speeds, using protuberances to transfer tape segments to the web with precise alignment and vacuum commutation to minimize slippage and noise, allowing for non-uniform and complex tab placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If window-knife applicators are used to cut and apply tape tabs, then tape tabs can be applied to traveling webs, but the tape web feeding is difficult when axial stiffness is low and contamination accumulates on the window knife surfaces
Solution Approach 1:
The patent introduces a vacuum anvil as an intermediary surface between the tape web and the application point. The vacuum anvil picks up tape tabs through vacuum suction and transfers them to the traveling web, eliminating the need for direct contact between the cutting knife and the tape web feed system. This resolves the feeding difficulty by decoupling the cutting function from the feeding function.
Solution Approach 2:
The patent extracts the tape tab holding function from the window knife assembly and places it on a separate vacuum anvil. The window knife is dedicated solely to cutting, while the vacuum anvil handles tape web feeding and tab holding. This separation eliminates contamination accumulation on the cutting surfaces and improves ease of operation.
2Productivity
If window-knife applicators operate at high speeds up to 1000 cuts per minute, then productivity increases, but practical speed is limited to approximately 750 cuts per minute due to mechanical constraints
Solution Approach 1:
The patent divides the applicator into separate functional modules: a cutting module with window knives, a vacuum anvil module for tape web handling, and a transfer mechanism. Each module can be optimized independently for speed, reducing mechanical constraints and enabling higher operational speeds while maintaining simplicity in each individual component.
3Speed
If slip-and-cut applicators use high velocity knife edges to cut tape segments, then cutting speed increases, but contaminants accumulate on the anvil surface causing registration and cut accuracy problems
Solution Approach 1:
The patent extracts the tape web contact function from the cutting knife and places it on a separate vacuum anvil. The high-velocity knife cuts the tape without contacting the tape web during feeding, preventing contaminant accumulation. The vacuum anvil handles the tape web at lower speeds, maintaining cut accuracy without contamination issues.
4Adaptability or versatility
If multiple tape tabs are applied to a traveling web, then functionality increases, but the complexity of the applicator system increases
Solution Approach 1:
The vacuum anvil serves multiple functions: it feeds the tape web, holds cut tape tabs through vacuum suction, and transfers them to the traveling web. This multi-functional design enables multiple tab placement capability while keeping the overall system complexity manageable by using a single versatile component rather than multiple specialized components.
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 quiet operation with low noise levels, efficient transfer of tape segments at high speeds, and successful application of complex tape configurations, overcoming previous limitations in speed and tab placement uniformity.
Implementation Method 1
a rotary knife or die with vacuum anvil cylinder system that feeds tape webs at matching speeds
Implementation Method 2
The first protuberance preferably has a surface velocity substantially identical to that of the traveling web
Data Source
AI summary
A method and apparatus for applying tape tabs to a traveling web of material, for example, placement of tape tabs on a running web of disposable undergarments. A pair of wheels each has a protuberance come in contact with the running web of material, which comes in contact with an infeeding tape web. The invention allows placement of tape tabs at asymmetrical spacings, where placement of the tape from contact of the first wheel and protuberance may not be equally or centrally spaced from placement of the tape by the second wheel and protuberance.