Magnetic Spindle Coupling for Web Tension Control
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Solution Overview
Problem
Existing foam-in-bag dispensing systems face challenges in efficiently and reliably dispensing foam precursors into bags, particularly in maintaining web tension and ensuring proper film handling and sealing.
Innovation Solution
The dispensing system incorporates a spindle with a mechanical and magnetic coupling mechanism that securely engages the roll core, allowing for precise control of web tension and film handling, while also utilizing a web tension motor and encoder to maintain optimal tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical latch and hinge system is used to secure the spindle, then the spindle can be reliably latched during operation, but the system becomes mechanically complex and requires manual intervention for loading/unloading
Solution Approach 1:
The patent replaces the traditional mechanical latch and hinge system with a magnetic coupling mechanism. The spindle incorporates a magnet that magnetically couples with a ferromagnetic material in the support column, eliminating the need for mechanical latches and hinges while maintaining secure attachment during operation and enabling easy loading/unloading through simple approach and departure movements.
2Device complexity
If a simple spindle design is used, then the device complexity is reduced, but web tension control precision deteriorates
Solution Approach 1:
The patent replaces complex mechanical tension control mechanisms with a magnetic coupling system that provides inherent tension control. The magnetic force between the magnet in the spindle and the ferromagnetic material in the support column automatically maintains optimal web tension without requiring additional mechanical components, sensors, or manual adjustment mechanisms.
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
This solution enables efficient and consistent dispensing of foam precursors into bags, ensuring proper film handling and sealing, and maintaining optimal web tension to prevent slack or breakage.
Implementation Method 1
The spindle includes a magnet, and the roll core includes a ferromagnetic material. The magnet and ferromagnetic material cooperate to prevent slippage between the roll core and the spindle.
Data Source
AI summary
Disclosed is a web handling system that includes a spindle having a spindle magnetic coupling portion and a roll core configured for receiving the spindle for mounting thereon and having a roll magnetic coupling portion, wherein the spindle and roll magnetic coupling portions are configured for magnetically attracting each other to hold the roll on the spindle.