Segmented Contact Roller for Uniform Winding
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Solution Overview
Problem
Existing winding devices with contact rollers cause uneven winding diameters across the axial extent of rolls, leading to mechanical stress and inhomogeneities in material webs, particularly affecting the edges, which can result in poorer printability and edge build-up.
Innovation Solution
A contact roller with axially spaced and circumferentially extending segments having greater material hardness than the remaining surface areas, allowing for increased pressure on the edges of the material web to achieve a more homogeneous roll diameter, where the segments can be made of different materials or have varying properties, such as modulus of elasticity, and can be designed with specific roughness and cambered shapes to enhance edge pressing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a homogeneous surface layer is used on the contact roller, then the structure is simple and easy to manufacture, but the winding diameter varies across the axial extent and edge build-up occurs
Solution Approach 1:
The surface layer is divided into multiple segments with different material properties along the axial direction. Each segment can have different hardness, elasticity, or friction characteristics, allowing differential pressure distribution across the material web width. This segmentation enables precise control of winding diameter uniformity while maintaining manufacturing feasibility through modular construction.
Solution Approach 2:
Different regions of the surface layer are assigned different material properties tailored to specific functional requirements. For example, edge regions may have higher hardness to prevent edge build-up, while central regions have different characteristics for optimal winding. This local differentiation resolves the contradiction by achieving precise winding control without requiring complete structural redesign.
2Device complexity
If the contact roller applies uniform pressure across the material web, then the structure is simple, but the edges are damaged and inhomogeneities occur
Solution Approach 1:
The contact roller surface is segmented into multiple zones that apply different pressure levels to different parts of the material web. This segmentation allows edge regions to receive reduced pressure, preventing damage and inhomogeneities, while central regions receive appropriate pressure for proper winding. The modular segment design achieves this complex pressure distribution without requiring overly complicated mechanisms.
Solution Approach 2:
Different segments of the surface layer are designed with locally optimized properties - such as varying hardness, elasticity, or friction coefficients - to create the desired non-uniform pressure distribution. This local quality approach reduces mechanical stress on vulnerable edge areas while maintaining effective winding control in central regions, resolving the contradiction between device simplicity and harm reduction.
3Object-affected harmful factors
If the surface layer is made softer to accommodate material web variations, then the material web is protected from stress, but the roll diameter becomes inconsistent
Solution Approach 1:
The surface layer is segmented into multiple sections with different material properties along the axial direction. This segmentation allows certain regions to have softer, more compliant characteristics that protect the material web from stress, while other segments maintain firmer properties to ensure consistent roll diameter formation. The modular approach enables simultaneous achievement of both protection and precision.
Solution Approach 2:
Different regions of the surface layer are assigned different material characteristics - such as varying hardness or elasticity - to simultaneously achieve material web protection and roll diameter consistency. Softer regions protect vulnerable areas from stress, while firmer regions maintain geometric precision, resolving the contradiction through spatially differentiated material properties.
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 solution ensures a significantly more homogeneous roll formation with reduced mechanical stress on the material web, preventing damage and maintaining the integrity of the material web during winding, as demonstrated by tests.
Implementation Method 1
the segments of the surface layer have a greater material hardness than the remaining areas of the surface layer, the edges of the material web being able to be pressed onto the roll with a higher pressure force than the other areas of the material web
Implementation Method 2
This surface layer often includes an elastically deformable material
Data Source
Figure 1~2
Figure 3~5
Figure 6~8
AI summary
The invention relates to a contact roll (1) for pressing at least one web of material (2), preferably a web of plastic film, against at least one rotating winding device (3), the contact roll (2) comprising a surface layer (32). There are at least two axially spaced-apart segments (36) which extend in the circumferential direction and in which the quality of the surface layer (32) differs from the quality of the other areas of the surface layer, at least some portions of said segments being in contact with the edges (9, 10) of the at least one web of material (2).