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Home > MacroLetter > 5.1 - Spring 1999
MacroLetter 5.1 - Spring 1999
Turret Winding
Contents:
Automatic Turret Winding Features Save Time and Money
As mentioned in the previous issue of MacroLetter, winders can be divided into three basic categories: Surface (or contact) winders, turret (or centre) winders and combination of surface and centre, commonly referred to as “Gap Winding”. Choosing the right winder for a particular application is vital. In this issue, we discuss turret (or centre) winders and where they are best applied.
Centre winders are recommended for rapid indexing, rigid or slippery films. The greatest advantage of the Automatic Centre Winder is that the web can be easily wound and transferred in both directions, when required. For the same diameter roll, centre winders are generally more expensive than surface.
A further improvement in quality winding is the so called “Gap Winding” technique (See Autumn 1998 issue of MacroLetter). Gap winding combines the advantages of both centre and surface winding. The web is brought to the roll by a driven roller, usually a lay-on roll. The spindle is driven separately and a small gap is maintained between the driven roller and winding roll. This feature is specifically used for very thin or tacky films, such as : stretch films; shrink films; and PP cast films, to allow for shrinkage.
Features to consider when buying a turret winder:
- Shaftless winding
- Maximum roll diameter
- Roll Handling
- Core diameter
- Tapered tension
- Tapered pressure
- Gap winding & Kiss winding
- Auto cut-off in both directions
- Flying knife cut-off
- Tapeless transfer
- Driven spreader roll
- Shaft prerotation
- Cantilevered shaft
- Automatic shaft handling
- Automatic shaft extraction
- Automatic core insertion
Automatic Core Loading and Tapeless Transfer Options Save Time and Money by eliminating the need to tape or handle empty cores, shafts, and finished rolls. Additional benefits include eliminating serious injuries from handling heavy shafts or finished rolls.
Before You Buy:
- Discuss you needs with the winder manufacturer
- Consider price versus performance, especially for coextruded films and multiple slitting operations.
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