Wrapping Apparatus Dynamic Dispensing Rate Control
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Solution Overview
Problem
Existing packaging systems face challenges in maintaining consistent wrap force and containment force during high-speed wrapping due to irregular load geometries and variations in demand rate for packaging material, leading to issues like breakage and inefficient material usage.
Innovation Solution
A wrapping apparatus that dynamically controls the dispensing rate of packaging material based on the effective circumference of the load, using sensors to determine the film angle, rotational position, and load dimensions to adjust the dispensing rate in real-time, thereby reducing tension fluctuations and enhancing containment force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the packaging material dispenser rotates at high speed to increase productivity, then wrapping speed improves, but the irregular geometry of the load causes erratic speed changes leading to packaging material breaks
Solution Approach 1:
The system dynamically adjusts the dispensing rate of packaging material based on the real-time rotational position of the load. As the load rotates, the controller modifies the dispensing rate to compensate for geometric variations, allowing high-speed operation without causing material breakage due to erratic speed changes
Solution Approach 2:
The system uses feedback from sensors that detect the rotational position and geometry of the load to continuously adjust the dispensing rate. This closed-loop control ensures the packaging material is supplied at the optimal rate regardless of load shape variations, preventing breaks while maintaining high wrapping speed
2Device complexity
If the packaging material dispenser supplies material at a constant rate to simplify control, then device complexity reduces, but the variation in demand rate due to load geometry causes loose wrapping or material breakage
Solution Approach 1:
Rather than using a constant dispensing rate, the system employs a dynamic dispensing rate that varies continuously with the rotational position of the load. This dynamic adjustment compensates for geometric variations in the load, ensuring consistent wrapping tension and preventing both loose wrapping and material breakage
Solution Approach 2:
The system changes the dispensing rate parameter in real-time based on the detected rotational position and geometry of the load. By dynamically modifying this critical parameter, the system maintains optimal wrapping conditions without requiring overly complex mechanical control mechanisms
3Reliability
If excess packaging material is supplied to ensure continuous coverage, then reliability of coverage improves, but the containment force decreases due to loose wrapping
Solution Approach 1:
The system uses feedback from rotational position sensors to precisely control the dispensing rate, ensuring that packaging material is supplied exactly when needed based on the load's geometry. This prevents both excess material (which would reduce containment force) and insufficient material (which would cause coverage gaps), achieving optimal wrapping tension
Data Source
AI summary
A wrapping apparatus and method utilize a controlled intervention to vary a dispense rate relative to a predicted dispense rate calculated based upon a predicted demand for packaging material.