Filament winding

Filament winding, a similar technique to pultrusion, involves winding cylinders, tubes and containers. This manufacturing method is used whenever the composite material components have to withstand high pressure despite their low weight, for example in industry or in automotive manufacture and shipbuilding. In filament winding, the fibres, such as carbon or glass fibre, are continuously fed from a roll through an impregnating bath and then wound onto a winding mandrel. This rotates while a payout eye travels horizontally in line with the axis of the rotating mandrel, laying down fibres. Owing to the axial speed of the payout eye and the rotational speed of the mandrel, the angle of the fibrous angle varies, resulting in a fully wrapped profile.

The fibres are first impregnated in the bath. It is filled with materials such as polyurethane or epoxy resin and must be kept at a constant level during the winding process. The DOPAG metering system eldomix can perform this task, for example. The bath is precisely adjusted to the optimum resin content by means of a level sensor and this results in a constant, reliable production of fibre-reinforced composites.