Automatic Roll Change System for Stretch Wrapping Machines
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Solution Overview
Problem
Existing stretch wrapping machines face challenges with manual roll changes, which are time-consuming and labor-intensive, and often require downtime due to film breaks and material handling issues, especially with heavier packaging materials and higher-speed machines.
Innovation Solution
An automatic roll change system with movable support members and mechanically-actuated load stations, including a packaging material guide assembly and actuator assembly, allows for efficient loading and unloading of packaging material rolls, reducing manual labor and minimizing downtime by automating the roll change process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual roll change is used, then labor flexibility is maintained, but labor costs increase and downtime increases
Solution Approach 1:
The system enables automatic roll changes through self-service mechanisms where the packaging material guide assembly autonomously releases and redirects the web onto the roller without operator intervention. The mechanically-actuated load stations automatically position and secure rolls, eliminating manual labor while maintaining continuous operation and reducing downtime.
Solution Approach 2:
The mechanically-actuated load stations are pre-positioned and pre-configured to receive and load rolls automatically. The packaging material guide assembly is pre-arranged with release mechanisms that activate at the precise moment needed, enabling seamless roll changes without operational interruption.
2Reliability
If heavier packaging material is used, then load protection improves, but roll handling difficulty increases
Solution Approach 1:
The system replaces manual mechanical handling of heavy rolls with a mechanically-actuated load station system that uses automated actuators to position, secure, and release rolls. This substitution eliminates the need for operators to manually handle heavy packaging material rolls, making the process safer and easier while maintaining reliable load containment through the same heavy-duty material.
3Reliability
If film breaks occur, then packaging integrity is compromised, but rethreading time increases downtime
Solution Approach 1:
When film breaks occur, the packaging material guide assembly's automatic release mechanism activates to quickly detach the broken web end. The mechanically-actuated load stations then automatically position a replacement roll and guide its web through the system, enabling rapid rethreading without operator intervention and minimizing downtime while maintaining packaging integrity.
Solution Approach 2:
The automatic roll change system rushes through the rethreading process by eliminating all manual steps. The mechanically-actuated load stations quickly swap rolls and the guide assembly rapidly redirects the new web, compressing the rethreading operation into a brief automated sequence that minimizes time loss while ensuring proper packaging integrity.
4Productivity
If automated roll change system is implemented, then downtime reduces, but system complexity increases
Solution Approach 1:
The automated roll change system is segmented into distinct functional modules: the packaging material guide assembly with its release mechanism, the mechanically-actuated load stations, and the roller positioning system. This segmentation allows each component to perform its specific function independently, simplifying the overall system architecture while achieving reduced downtime through coordinated automated operation.
Data Source
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AI summary
An automatic roll change system for a stretch wrapping machine may include multiple mechanically-actuated load stations capable of being actuated by a common actuator assembly, as well as pivotable support members for use in positioning packaging material in a tortuous path for loading into a packaging material dispenser.