Epoxy fiberglass tube is a kind of insulating pipe with high insulation performance, which is made or wound with g...
Epoxy fiberglass tube is a kind of insulating pipe with high insulation performance, which is made or wound with glass fiber material and epoxy resin film. The main winding processes include the following. Each has its own advantages. Today Ztelec Groups will give you a detailed introduction.
(1) Dry winding. The fiber is dipped into a prepreg tape (the resin is in the B stage), heated to soften, wound on the core mold and cured.
Features: The glue content is strictly controlled, and the product quality is uniform and stable; the winding speed can be increased to 100~200m/min during the process; the equipment and site during the molding process are relatively clean; it is easy to realize automation and mechanization; good labor and hygiene conditions, and product quality High; it is required that the curing agent used does not sublime or volatilize when the prepreg is dried, and does not deteriorate during intermediate storage. The winding equipment is more complicated, and prepreg yarn manufacturing equipment needs to be added, so the investment is relatively large, and the product layer-wise shear strength is low.
(2) Wet winding. After the fiber is dipped in glue, it is directly wound on the core mold and cured.
Features: The equipment is simple, the cost is 40% lower than that of dry winding; the product has good air-tightness, because the tension during winding makes the excess glue squeeze out the bubbles; the glue on the fiber during winding can reduce fiber wear; high production efficiency ( Up to 200m/min). However, the waste of resin glue is large, the working environment is poor, and the glue content is not easy to control, which affects the quality of the finished product. Due to the low investment and low cost (about 60% of dry production), there are more domestic applications, mainly for the production of civilian products and electrical products.
(3) Semi-dry winding. Compared with the wet method, the drying process is added, that is, the drying facility is added between the fiber dipping and winding to the core.
Features: Adding a drying process facilitates the removal of volatile low-molecular compounds in the dipping glue. Reduce the air gap of the finished product and improve product quality. Moreover, the prepreg winding and heating and softening procedures and corresponding equipment are reduced, which not only improves production efficiency but also improves product quality.