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Comparison of advantages and disadvantages of three common dipping forms of winding forming

May 24, 2020

Tension control system

Fiber tension control during fiber winding is the key to obtaining composites with excellent properties. Generally speaking, in spiral winding and plane winding, the tension level of the fiber bundle is generally controlled at 0.45 ~ 1.8kg, while in radial winding, in order to make this layer denser, generally use a higher pressure (2.7 ~ 3.6 kg). The picture is a typical tension control system.

Tension control system

Dipping and fiber supply system

There are three most common types of dipping in fiber winding: dipping, rubbing and metering dipping, as shown in Figure 3-39. The simplest dipping tank usually has no moving parts, they are composed of dipping roller, rubber tank and pressure roller. The multiple fiber yarns are impregnated with resin through the rubber impregnating roller, then pass through the second rubber impregnating roller and the rubber pressing roller, and finally wound onto the mandrel. During high-speed winding, the infiltration of the fiber bundle can be spread by a rotating roller to improve its permeability. On this basis, adding glue-limiting holes helps to control the resin content of the winding parts. The dipping method is suitable for the winding of glass fiber and aramid fiber, because the damage tolerance of glass fiber and aramid fiber is large. But for carbon fiber, because it is easily damaged and broken, it is more suitable for the dipping method. In the gumming method impregnation device, a rotating cylinder contacts the resin in the resin tank to take up the resin. After a doctor blade, a thin resin layer is formed on the surface of the cylinder, and the fibers are impregnated with the thin resin layer on the top of the cylinder. The rubbing method allows impregnation at low stress levels, so it is not easy to damage the fiber. The fiber is damaged, so care must be taken and cleaned during winding.