Guide Roller Translation for Nonlinear Web Application
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Solution Overview
Problem
Existing methods for bonding leg elastics to a moving web at high line speeds are limited in achieving significant curvature, leading to manufacturing reliability issues and inefficiencies, resulting in straight or nearly straight leg elastics in absorbent articles.
Innovation Solution
An apparatus and method utilizing a guide roller and guide roller translation system to control the position of a nip between a back-up roller and guide roller, allowing the first web to be applied in a nonlinear pattern by adjusting the guide roller's position, enabling greater amplitude and reliability at higher line speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If known techniques are used to bond leg elastics to web at high line speeds, then productivity is improved, but manufacturing precision deteriorates resulting in straight or relatively straight leg elastics instead of curved patterns
Solution Approach 1:
The guide roller is made movable relative to the back-up roller through a translation system, allowing dynamic adjustment of the nip position during operation. This enables the system to adapt to different web speeds and maintain precise nonlinear pattern application at high line speeds, resolving the contradiction between productivity and manufacturing precision.
Solution Approach 2:
The invention changes the positional parameters of the guide roller relative to the back-up roller to control the nip position. By adjusting these parameters, the system can achieve significant curvature in leg elastics while maintaining high machine line speeds, thus improving both pattern accuracy and productivity.
2Shape
If efforts are made to place leg elastics with significant displacement at high line speeds, then pattern curvature is improved, but reliability deteriorates causing web breakage and machine shutdowns
Solution Approach 1:
The movable guide roller acts as an intermediary between the web source and the back-up roller. It provides controlled guidance and tension management, preventing web breakage while enabling significant curvature in leg elastics. This intermediary mechanism improves reliability by reducing web stress and preventing machine shutdowns.
Solution Approach 2:
The dynamic positioning capability of the guide roller allows the system to adapt to web tension variations and maintain stable operation. This dynamic adjustment prevents web breakage and machine shutdowns, thereby improving reliability while achieving the desired curvature pattern.
3Ease of manufacture
If known bonding techniques are used, then ease of manufacture is maintained, but manufacturing precision deteriorates causing off-target application and inconsistent deviation
Solution Approach 1:
The movable guide roller system maintains ease of manufacture by using a relatively simple mechanical translation mechanism while achieving high manufacturing precision through controlled nip position adjustment. This dynamic system provides consistent off-target deviation control and accurate pattern application without complicating the overall bonding process.
Data Source
AI summary
An apparatus and method for applying a first web to a base web in a nonlinear pattern as the base web is advanced in a machine direction in contact with a back-up roller are disclosed. The apparatus can include a guide roller and a guide roller translations system. The guide roller can be configured to define a nip with the back-up roller. The guide roller translation system can be configured to allow the guide roller to move with respect to the back-up roller to control the position of the nip to allow the first web to be applied to the base web in the non-linear pattern in the machine direction.