Winding is a complex interaction of material properties, winding conditions, and equipment design. Selecting the ideal winding conditions, equipment, and roll-to-roll transfer for your application is essential for achieving optimal roll and single sheet quality.
Precision Winding Processes for Optimal Web Manufacturing
processes
Winding
Types of Winding:
Choosing the best winder type is essential for producing a high-quality wound roll. Specific requirements for tension, nip, and torque dictate which winder configuration to select.
Center
Surface
Center with Surface
winding Defects:
Even with the right equipment, winding defects are inevitable. Webineering can help explain and resolve these issues to build a strong, robust operation. Below are examples of winding defects that Webineering can help you address.
Air Buckles
A wavy appearance around the circumference of a roll (also known as TD or CD buckles).
Cinching
A buckle appearing at or near the core due to rotational movement between the inner layers.
Core Impressions
Deformation of web layers near the core, discovered after the roll is unwound.
Cut-Over Issues
Wound roll defects or operational upsets created when transferring the web from a finished roll to a core.
Edge Wander/Shifting
An unstable or moving web edge that negatively affects the web or roll quality.
Gauge-Related
Persistent thick or thin lanes in a web creating defects in a wound roll like stretch lanes, gauge bands, and corrugation.
Starring or Spoking
The appearance of a radial or star-shaped pattern on the side of a roll.
Telescoping
Interlayer slippage in a wound roll causing layers of the wound roll to shift laterally.
Tin Canning
A wound roll with the appearance of a tin can or wavy pattern across the width (aka MD ridges).
Wrinkling
A fold-over or crease. Main categories include MD, diagonal, converging, accumulation, and expansion.
we can help you:
- Resolve Winding-Related Defects (above)
- Create Specifications
- Perform Acceptance Testing
- Resolve Tension Control Issues
- Optimize Winding Conditions
- Improve Alignment
PROCESSES
Web Conveyance
Transporting the web from the unwind to the winder can be more complicated than you think. Many factors need to be considered and controlled to achieve the desired speed without creating defects.
