Oscillating Cutter Winding Device for Stretch Film Edge Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing winding devices for stretch films face issues with edge damage during wrapping, leading to film tears, and existing methods for folding edges to prevent damage either result in thick edges or creases, complicating the winding process.
Innovation Solution
An oscillating device moves the cutter bar transversely to the film direction, allowing for lateral shifting of folded edges, with adjustable stroke and frequency, and a folding device that can handle edges separately or simultaneously, enabling optimal edge geometry without complex additional devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the edges of stretch film are folded over to prevent damage, then resistance to damage is improved, but the edges of the film roll become thick and hard
Solution Approach 1:
The patent applies dynamic oscillation to the folding device, causing it to move laterally during the folding process. This dynamic movement prevents the edges from stacking directly on top of each other, thereby reducing edge thickness while maintaining the protective folded structure. The oscillating motion is controlled to synchronize with the film web speed and roll diameter.
Solution Approach 2:
The folding device performs periodic lateral oscillations during the edge folding process. This periodic action creates a rhythmic side-to-side motion that distributes the folded edges along the roll circumference, preventing accumulation at single points and reducing overall edge thickness and hardness.
2Reliability
If the film web is reversed or oscillated before winding to fold edges, then edge damage resistance is improved, but creases are produced that impair film function
Solution Approach 1:
The folding device is designed with controlled dynamic oscillation that moves laterally during operation. This controlled dynamic motion folds edges without creating sharp creases, as the oscillation distributes stress and prevents concentrated folding lines that would impair film functionality.
Solution Approach 2:
The system adjusts oscillation parameters including stroke length, frequency, and phase angle to optimize the folding process. By carefully controlling these parameters, the device achieves edge folding that resists damage while minimizing crease formation through precise parameter optimization.
3Manufacturing precision
If individual folding devices are provided for each edge to handle them separately, then edge geometry control is improved, but device complexity increases
Solution Approach 1:
The patent employs a single folding device that performs multiple functions: it folds both edges of the film web, controls edge geometry, and oscillates laterally to reduce edge thickness. This multi-functional approach achieves precise edge control without requiring separate devices for each edge, thereby reducing overall system complexity.
Solution Approach 2:
The folding device integrates edge folding, lateral oscillation, and geometry control into a single unified mechanism. By merging these functions into one device rather than using separate devices for each function, the system achieves complex edge control with reduced overall device complexity.
4Ease of operation
If the cutter bar is stationary during winding, then winding simplicity is maintained, but lateral shifting of folded edges is not achieved
Solution Approach 1:
The cutter bar is transformed from a stationary component to a dynamically oscillating one. This dynamic oscillation allows the folded edges to be laterally shifted during winding, creating a reduced edge structure. The oscillation is synchronized with the winding process to maintain simplicity while achieving the desired edge geometry.
Solution Approach 2:
The cutter bar performs periodic lateral oscillations during the winding process. This periodic movement systematically shifts the folded edges along the roll circumference, creating uniform edge distribution and reduced edge structure without complicating the overall winding operation.
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a winding device for winding a running web of material, having at least one cutter for slitting the web of material in the direction of the web into a plurality of web sections, and having a folding device for folding the edges of the web sections. In order to provide a winding device that allows winding a web of material with folded edges as easily as possible and without wrinkles, an oscillating device is provided, by means of which the at least one cutter can be moved transversely to the direction of the web.