Non-heated mandrels

In a filament winding process the filament is applied on a mandrel. Mandrel types can be distinguished in heated mandrels, non-heated mandrels, dissolvable cores and liners. Using a heated or non-heated mandrel the quality of the mandrel surface is an important factor due to the fact that the finally wound component must be stripped (pulled or pushed) over the surface. By using a liner or a dissolvable core the surface quality is not so relevant, due to the fact that the liner remains in the product and the dissolvable core is removed after the winding process. 

The temperature distribution in a winding process with a non-heated mandrel is not homogeneous over the whole winding duration. At the beginning of the process the mandrel has an ambient temperature which increases during the winding due to the heating by the main heater and the heated... 

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