Synchronized Clock Control for Absorbent Article Phasing
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Solution Overview
Problem
At high web speeds in absorbent article manufacturing, existing control systems face time delays that lead to unstable and inaccurate control of component placement, resulting in defective products, and attempts to compensate for these delays either reduce production rates or increase complexity and cost.
Innovation Solution
Implementing a system with synchronized clocks for precision clock synchronization across instrumentation and control devices on a non-deterministic communication network, allowing for accurate correlation of component placement detections and control without accounting for undeterminable delays, and virtually segmenting substrates to adjust component placement in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high base web speeds are used to maintain high production rates, then productivity is improved, but time delays in the control system result in unstable and inaccurate control of component placement
Solution Approach 1:
The patent replaces traditional mechanical timing and positioning systems with an optical measurement system (laser displacement sensor) and electronic control system. The sensor continuously measures the actual position of the base web, and a controller processes this data to calculate and apply real-time position corrections, substituting mechanical timing mechanisms with electronic feedback control that can operate accurately at high speeds
Solution Approach 2:
The patent implements a closed-loop feedback control system where a laser displacement sensor continuously monitors the actual position of the base web, feeds this information back to a controller, which then calculates position errors and applies corrective adjustments to the component placement system. This feedback mechanism enables accurate component placement at high web speeds by continuously compensating for position variations
2Measurement precision
If traditional control systems with sensors are used to monitor component positions, then measurement capability is improved, but time delays in the control loops result in unstable control at high web speeds
Solution Approach 1:
The patent replaces traditional contact-based or mechanical position sensing systems with a non-contact laser displacement sensor that uses optical measurement. This substitution eliminates mechanical response delays and provides high-frequency position data with microsecond timing precision, enabling stable control at high web speeds where traditional sensors would fail due to response time limitations
Solution Approach 2:
The patent implements preliminary action by continuously pre-measuring the base web position upstream of the component placement point and calculating predicted position errors before components need to be placed. This allows the control system to prepare correction commands in advance, compensating for position variations before they affect component placement accuracy, thereby maintaining control stability at high speeds
Data Source
AI summary
The present disclosure relates to systems and processes for controlling the relative positions or phasing of advancing substrates and/or components in absorbent article converting lines. The systems and methods may utilize feedback from technologies, such as vision systems, sensors, remote input and output stations, and controllers with synchronized embedded clocks to accurately correlate component placement detections and placement control on an absorbent article converting process. The systems and methods may accurately apply the use of precision clock synchronization for both instrumentation and control system devices on a non-deterministic communications network. In turn, the clock synchronized control and instrumentation network may be used to control the substrate position. As such, the controller may be programmed to the relative positions of substrates and components along the converting line without having to account for undeterminable delays.