Absorbent Pad Forming Drum Valve Phasing Control
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Solution Overview
Problem
Existing machines for producing absorbent sanitary articles often form defective pads due to incorrect manual settings or mechanical malfunctions, leading to incorrect positioning of discrete superabsorbent polymer layers, which reduces the pads' liquid absorption capacity.
Innovation Solution
A machine with a forming drum and a hood system that includes a metering system for natural fiber and superabsorbent polymer materials, featuring a microwave resonator-based detecting device to ensure correct phasing of the valve system with the drum's rotation, ensuring precise placement of discrete superabsorbent layers within the absorbent pads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If intermittent valve means are used to regulate SAP feed flow, then discrete charges of superabsorbent polymer material can be delivered, but the valve means may go out of phase with drum rotation due to incorrect manual settings or mechanical malfunctions
Solution Approach 1:
A detection device detects the actual position of the drum and provides feedback signals to a control unit, which automatically adjusts the valve timing to maintain correct phasing. This closed-loop feedback system eliminates the need for manual setting and compensates for mechanical variations, ensuring reliable synchronization between the valve means and drum rotation.
Solution Approach 2:
The manual mechanical adjustment system is replaced with an automated control system using detection devices and control units. The control unit processes detection signals and automatically regulates the valve timing, substituting manual mechanical phasing with electronic control to improve both precision and reliability.
2Productivity
If the feeding duct delivers charges of SAP when the suction recess only partly faces or does not face the duct delivery mouth, then production continues without interruption, but defective absorbent pads are formed with incorrectly positioned discrete layers
Solution Approach 1:
The detection device monitors the actual position of the suction recess relative to the delivery mouth and provides feedback to the control unit. The control unit uses this information to regulate valve timing dynamically, ensuring SAP charges are delivered only when the suction recess is correctly positioned, thus preventing defects while maintaining continuous production.
Solution Approach 2:
The system transitions from static, pre-set valve timing to dynamic, real-time adjustment based on actual drum position feedback. The control unit continuously regulates valve operation according to detected drum position, allowing the system to adapt to variations in drum rotation and maintain precise positioning throughout continuous production.
3Ease of manufacture
If intermittent valve means are manually set to regulate SAP feed flow, then discrete charges can be delivered at drum recess intervals, but mechanical malfunctions cause phasing errors
Solution Approach 1:
A detection device continuously monitors drum position and provides feedback to a control unit that automatically adjusts valve timing. This eliminates manual setting while maintaining system simplicity through automated control, and significantly improves reliability by compensating for mechanical malfunctions and variations in real-time.
Solution Approach 2:
The system performs self-adjustment through automatic control based on detection feedback. The control unit autonomously regulates valve timing without external intervention, allowing the system to self-correct phasing errors caused by mechanical variations or malfunctions, thereby improving reliability while keeping the operation simple.
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 ensures optimal liquid absorption by correctly positioning the superabsorbent layers, enhancing the absorbent pads' performance and reducing labor costs by automating the detection and correction of layer positioning.
Implementation Method 1
a microwave resonator-based detecting device to ensure correct phasing of the valve system with the drum's rotation
Implementation Method 2
The fluff and 'SAP' are fed pneumatically into the hood and, once mixed, settle in the suction recesses formed on the drum
Data Source
AI summary
A machine for making absorbent sanitary articles including an absorbent pad with at least one discrete layer of superabsorbent polymer material includes a unit for forming and applying a succession of absorbent pads, which includes a drum for forming the pad, a duct for feeding a charge of superabsorbent polymer material to the drum and intermittent valve mounted along a stretch of the duct and driven by an actuator. A device detects the superabsorbent polymer material and sends a signal to a control and drive unit connected to the device indicating that the superabsorbent polymer material has been detected. The control and drive unit is configured to drive the actuator to bring the valve into phase with the rotation of the drum when the deviation of the signal from a reference signal exceeds a defined threshold value.