Another important parameter is the manufacturing process. Basically, there are two different ways to make pipes made of glass and resin.
The centling ear is the optimum in terms of chemical resistance and abrasion resistance.
Sling tubes are produced by making cuts corresponding to the circumference and length of the mould from different types of glass fabric and glass mat. These cuts are inserted into a mold, this form is brought in rotation (SCHLEUDERN). Resin is then injected from the inside.
This method offers the following advantages:
Since a production of centling tubes is no longer economically interesting above a nominal width of DN 350, the so-called winding has been perfected as a further production method. Winding tubes are made by leading endlessly long threads (roving) over a wide comb to a mold. There, either the mold or the threads are wetted with resin and applied to the mold (wrapping). This technique can be refined by varying the winding angle and adapting it to the requirements (e.g. at internal pressure winding angle 54° to the pipe axis). With this production method, too, efforts are made to achieve the highest possible resin content inside the pipe. For this purpose, at the start of production of the pipe, a fleece or mat is introduced as a carrier for the resin.
Wall construction of Fiberpipe winding tubes made of epoxy or vinyl ester resin.