The chemical fiber coiling process is a good technology in the production of many products. Such as FRP pipe , storage tanks, gas tanks and centrifugal fan leaves. Moreover shigh jump poles, cable poles, FRP pipe for mining, badminton rackets and other products.
The coil forming process is to coil the continuous chemical fiber pre-impregnate with epoxy resin on the mold according to a certain regularity. Stack it to the required thickness, and dry it out of the mold. That is, the customized product of ore-forming glass fiber reinforced plastic.
The characteristics of this method can design and manufacture the coiling regularity of chemical fibers according to the conditions of the commodity to bear the ground stress. So as to make full use of the compressive strength of chemical fibers. And it is very easy to complete mechanical automation and automation technology. And the product quality is relatively stable. The same epoxy resin conventional and organic chemical composite type of chemical fiber can achieve the best practical effect of safety engineering.
There are three types of coiling processes:
1. Dry coiling is the use of prepreg yarn or tape . Which is heated and softened to a viscous flow state on a winding machine. And then coiled onto the mold. Because the prepreg yarn is a technology specialized in the production and manufacture of mining glass steel pipes. It can strictly control the epoxy resin composition (accurate to within 2%) and the quality ofSemi-dry coiling is a chemical fiber polypropylene filament. In the middle of coiling to the mold, a set of dryer equipment is upgraded to remove the organic solvent in the dipped yarn. Compared with the dry type, the prepreg process and process are omitted. Machinery and equipment; compared with wet type, it can reduce the vapor component in the productthe prepreg yarn.
Therefore, dry coiling can accurately manipulate product quality. The major feature of the dry coiling process is the high efficiency of production and manufacturing. The coiling speed reaches 100-200m/min.
However , The defect of custom-made FRP pipe for mining is that the coiling machinery and equipment are expensive, and the prepreg yarn production and manufacturing equipment must be upgraded, so the project investment is huge. In addition, the shear strength of dry coiled products is low.
2.Wet coiling is to coil the chemical fiber beta-ray (yarn-type belt) polypropylene filament immediately under the tension sensor to the hollow floor cover.
The advantages of wet coiling are:
①The cost is 40% lower than that of dry coil;
②The product has good airtightness. The unnecessary epoxy glue liquid squeezes the bubbles due to the coiled support force and fills the gaps;
③Good flatness of chemical fiber sorting;
④When wet coiling, the epoxy resin glue on the chemical fiber and the custom-made glass steel pipe for mining can reduce the damage of the chemical fiber;
⑤ High production efficiency (up to 200m/min).
The defects of wet coiling are:
① Firstly , The consumption of epoxy resin is large and the actual operating environment is poor;
② And it is difficult to control the amount of glue and the quality of finished products;
③ There are few types of epoxy resin available for wet coiling.
3. Moreover , Semi-dry coiling is a chemical fiber polypropylene filament. In the middle of coiling to the mold, a set of dryer equipment is upgrade to remove the organic solvent in the dipped yarn.
Among the three coiling methods, wet coiling is more widely used; dry coiling is only used for cutting-edge technology industries that require high performance and precision, such as custom-made glass steel pipes for mining.