Mandrel Extraction via Rotation and Air Lubrication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for removing the winding mandrel from coreless rolls often result in damage to the roll or require excessive force, leading to production slowdowns and complexity in the extraction process.
Innovation Solution
A method and device that rotate the mandrel during extraction, applying a relative rotation speed between the mandrel and the paper coil to reduce friction, combined with a geometric coupling mechanism for efficient torque transmission, and optional air blowing to reduce friction further.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the mandrel is extracted axially without rotation from the roll, then the extraction process is simple, but the extraction force is excessive and causes damage to the roll and mandrel
Solution Approach 1:
The mandrel is rotated during extraction instead of being pulled axially in a static position. This dynamic approach reduces friction between the mandrel surface and the paper coil, significantly lowering the extraction force required and preventing damage to both the roll and mandrel.
Solution Approach 2:
The patent replaces the traditional axial pulling mechanism with a rotational extraction mechanism. By introducing rotation, the system transforms the extraction process from direct friction-based pulling to a lower-friction rotational movement, reducing the mechanical force required.
2Ease of operation
If the mandrel diameter is varied to facilitate extraction, then extraction is easier, but the device becomes very complex with grippers and articulated operating cycles
Solution Approach 1:
Instead of varying the mandrel diameter through complex mechanical adjustments, the patent maintains a simple mandrel structure and achieves ease of extraction by rotating the mandrel during the extraction process. This dynamic approach simplifies the device while improving operability.
3Productivity
If the roll is extracted stuck to the winding mandrel, then production stops, but increasing extraction force causes damage
Solution Approach 1:
The rotating extraction method prevents the roll from becoming stuck on the mandrel by continuously moving the mandrel surface relative to the paper coil during extraction. This reduces friction and prevents adhesion, ensuring continuous production without damage to the roll integrity.
4Force
If air blowing is applied during extraction, then friction is reduced further, but the device complexity increases
Solution Approach 1:
Air blowing is applied through the mandrel during rotation to create an air cushion between the mandrel surface and the paper coil. This pneumatic approach further reduces friction and extraction force requirements, with the added benefit that the air supply system can be integrated into the existing mandrel structure.
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 method significantly reduces the extraction force required, minimizing the risk of damage to the roll and mandrel, while simplifying the process and reducing cycle times.
Implementation Method 1
applying a relative rotation speed between the mandrel and the paper coil to reduce friction
Implementation Method 2
optional air blowing to reduce friction further
Data Source
AI summary
A method for stripping a winding mandrel from a roll formed by wrapping a web around the winding mandrel includes the following phases:to support the formed roll so that an end of the respective winding mandrel is adjacent to a gripping and rotating means for the winding mandrel;to connect the gripping and rotating means to the end of the winding mandrel and through this means place the winding mandrel in axial rotation; andto apply, by means of a translation means, an axial force to the gripping and rotating means and to the mandrel and, according with the axial force, translate this mandrel by sliding it off the formed roll.