Corner Geometry-Based Wrap Control for Irregular Loads
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Solution Overview
Problem
Conventional wrapping systems face challenges in maintaining consistent wrap force and containment force due to irregular load geometries and varying demand rates, leading to packaging material breaks and inefficiencies, especially at high speeds and with thinner materials.
Innovation Solution
A corner geometry-based wrap control system that adjusts the dispensing rate of packaging material based on the geometric relationship between the load's corners and the dispenser, using sensors to determine corner positions and rotational angles to optimize dispense rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional constant-speed dispensing is used, then the packaging material dispenser operates simply, but the wrap force fluctuates and containment force is inconsistent due to irregular load geometry
Solution Approach 1:
The dispensing system transitions from constant-speed operation to variable-speed operation, dynamically adjusting the dispense rate based on the real-time geometric relationship between the dispenser and load corners. The controller modifies dispensing speed according to rotational position and corner proximity, ensuring consistent wrap force despite load geometry variations.
Solution Approach 2:
The system implements feedback control by continuously monitoring the rotational position of the load and calculating the geometric relationship between the dispenser and load corners. This feedback information is used by the controller to adjust the dispense rate in real-time, maintaining consistent containment force throughout the wrapping cycle.
2Productivity
If high dispense rate is used to increase productivity, then wrapping speed improves, but packaging material breaks occur due to excessive tension on irregular geometries
Solution Approach 1:
The system dynamically adjusts the dispense rate based on the instantaneous geometric conditions. When approaching load corners or navigating irregular geometries, the dispense rate is automatically reduced to prevent excessive material tension and breaks. Between corners, the dispense rate increases to maintain productivity, optimizing the balance between speed and material integrity.
3Reliability
If low dispense rate is used to prevent material breaks, then packaging material integrity is maintained, but containment force is insufficient and wrapping efficiency decreases
Solution Approach 1:
The system employs dynamic rate modulation, switching between high and low dispense rates based on real-time geometric conditions. During critical phases near load corners, the rate decreases to prevent breaks. During stable phases between corners, the rate increases to build sufficient containment force, achieving both material integrity and effective wrapping.
Solution Approach 2:
The dispensing process follows a periodic pattern of acceleration and deceleration synchronized with the rotational position of the load. The system anticipates corner approaches and periodically adjusts the dispense rate accordingly, creating a rhythmic pattern that maintains both material integrity and wrapping effectiveness throughout the cycle.
4Adaptability or versatility
If the load is not centered at the rotation center, then loading flexibility is maintained, but the variation in demand rate increases making proper wrapping difficult
Solution Approach 1:
The control system continuously monitors the rotational position and calculates the actual geometric relationship between the dispenser and load corners, regardless of load centering. This feedback mechanism compensates for off-center loading by adjusting the dispense rate based on the true instantaneous geometry, maintaining precision without requiring perfect load centering.
Solution Approach 2:
The system dynamically changes the dispense rate parameter based on the calculated geometric relationship. When the load is off-center, the controller detects the altered corner-to-dispenser distances and adjusts the dispense rate accordingly, adapting the wrapping parameters to the actual load position rather than relying on ideal centering conditions.
Data Source
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AI summary
A wrapping apparatus (100) and method utilize a corner geometry-based wrap control that controls the rate at which packaging material (108) is dispensed at least in part based on the geometrical relationship between one or more corners of a load (110) and a packaging material dispenser (106).