MANUFACTURING
New Bowed Rolls
Manufacture of a new roll based on technical documentation, agreed dimensions or a specification derived from its installation position and function in the machine.
When film, paper, nonwoven or textile web wrinkles during handling, a properly selected bowed roll helps spread the material across its width and stabilize the web path. We manufacture new custom bowed rolls and assess whether used components are suitable for refurbishment.
We start with information about the material, machine, and the problem occurring on the line. Only then do we define the design of a new bowed roll or the scope of refurbishment.
Dimensions, photographs, documentation, type of web material, and a description of the problem occurring on the line.
We assess the roll design, installation conditions, operating parameters, and the required process result.
We define the geometry, working surface, mounting method, and required scope of work.
We carry out the agreed scope in accordance with the approved documentation and technical parameters.
After completion, we verify the agreed parameters and prepare the component for further operation.
Send photographs, basic dimensions, markings, a description of how the roll operates in the machine, or the existing roll for assessment.
The starting point is not a ready-made catalogue option, but the material, system geometry and the problem occurring on the line. Based on this information, we determine the design direction for a new roll or the scope of refurbishment.
Manufacture of a new roll based on technical documentation, agreed dimensions or a specification derived from its installation position and function in the machine.
Refurbishment feasibility is determined after inspecting the roll design, rubber working surface, end connections and the components responsible for correct roll operation.
A variant for applications in which the roll geometry is defined for the selected material, web width and web path.
A design that allows the bow to be adjusted within the specified range to accommodate changes in the material or web-handling parameters.
The rubber working-surface specifications are determined from the web material, the required contact with the web, line speed and operating environment.
The analysis can begin with the existing roll, photographs, basic dimensions and mounting method to determine the data required to reproduce the component.
Rotation of a properly configured bowed roll changes the web-guidance direction and helps spread the web from the centre toward the edges. This effect is used to reduce wrinkles, folds and unstable web tracking.
The web runs over the rubber working surface of the bowed roll.
The bowed geometry helps direct the web from the centre toward the edges, reducing the tendency for wrinkles and folds to form.
A properly selected bowed roll helps maintain a more even web profile and stabilize the web path during machine operation.
Selecting the bow, wrap angle, and roll position helps maintain consistent web guidance.
The roll design is determined based on the material parameters, production line, and installation position.
| Parameter | Data to Specify | Impact on Design |
|---|---|---|
| Web Material | Film, paper, nonwoven, textile or other web material | Affects the selection of the working surface and required traction. |
| Web Width | Working width and its variation range | Determines the required working length of the roll. |
| Line Speed | Actual machine operating speed | Affects balancing and dynamic-performance requirements. |
| Web Tension | Typical and maximum load during operation | Required for correct selection of roll geometry and system stiffness. |
| Length and Diameter | Working dimensions and available installation space | Define the basic roll dimensions. |
| Bow Geometry | Fixed or adjustable bow and bow direction | Determines how the web is spread. |
| Wrap Angle | Angle of web contact with the roll surface | Affects the spreading effectiveness of the bowed roll. |
| WORKING SURFACE | Rubber type, hardness, surface structure and process requirements | Selected for the web material and operating conditions. |
| Bearing Arrangement and Mounting | Installation method, end connections and mounting points | Allows the roll to be matched to the existing machine. |
| Operating Conditions | Temperature, humidity, dust and process environment | Affect material selection and component design. |
Basic dimensions, information about the web material, operating conditions and installation position are enough to begin the analysis. The documentation can be supplemented based on measurements and inspection of the existing component.
Bowed rolls are used in web-handling systems when the material needs to be spread across its width, wrinkles reduced and the web path stabilized.
Guiding and spreading film before rewinding, laminating, coating or the next process stage.
Stabilizing paper in rewinding, converting and transport systems between successive machine sections.
Spreading the material across its width where reducing folds and maintaining a stable web path are important.
Even guidance of textile materials before further processing, winding or transport.
A bowed roll is an assembly in which axle geometry, working surface, bearing arrangement and mounting method must work together as one system.
The element in direct contact with the web.
The curved geometry is responsible for the roll’s characteristic spreading action.
Allows the working surface to rotate while maintaining the axle geometry.
Matched to the roll design and the way it is mounted in the machine.
The mounting method depends on the installation position and the design of the existing line.
Selected designs allow the bow geometry to be adjusted for different operating conditions.
The correct geometry, working surface and installation position help stabilize web handling before subsequent process stages.
The material is spread more evenly across its width before the next process stage.
A correctly set bowed roll helps reduce uncontrolled lateral web movement during handling.
The web can be prepared more consistently for rewinding, coating, laminating or the next process stage.
More stable web handling helps maintain more repeatable operating conditions across the line.
The problem does not always mean that a new roll is required. First check the geometry, mounting, working surface and actual operating conditions.
Possible causes include incorrect bow, insufficient wrap angle or an incorrect roll position in the web path.
Check axle alignment, system symmetry, web guidance and the condition of mounting components.
Possible causes include worn bearings, excessive play, incorrect mounting or issues with the roll’s dynamic behaviour.
Cracking, glazing, localized wear or loss of surface properties can reduce contact between the roll and the web.
The decision is made after assessing the design, working surface, geometry, bearing arrangement and whether the required parameters can be restored.
Key information about selecting, manufacturing and refurbishing bowed rolls.
A bowed roll helps spread web material across its width, reduce the formation of folds and wrinkles, and stabilize web handling.
Yes, if the condition of the roll allows the required parameters to be restored. The refurbishment scope is determined after assessing geometry, the working surface, bearing arrangement and mounting components.
Not always. The analysis can begin from the existing roll, basic dimensions, photographs and information about the machine and web material.
It depends on web width, web-path geometry, wrap angle, web tension, line speed and the roll’s installation position in the machine.
Yes. The design can be reproduced based on an existing component, documentation, measurements and installation conditions.
Bowed rolls are used for film, paper, nonwovens, textiles and other materials processed as continuous webs.
Send the roll dimensions, photographs, web material, web width, line speed, mounting method and a description of the problem.
Send photographs, basic dimensions, information about the web material and a description of the problem. Based on this information, we can begin a technical assessment of the solution.
