The components of the epoxy resin glue should consider not only the technical requirements of the cured product (because the heat resistance, chemical resistance, and electromechanical properties of the winding product depend on the composition of the epoxy resin glue), but also the needs of the winding molding process, otherwise it cannot be wound into shape. For this reason, the basic requirements for epoxy resin glue are as follows:

1.The fluidity of the resin glue should be good to ensure that the fibers are soaked, the glue content is uniform, and the bubbles in the yarn sheet can be discharged. Therefore, its viscosity should be controlled within 0.35~1Pa·s. If the viscosity is small, the penetration is good, but it is easy to lose the glue content and affect the electromechanical performance of the product. However, if the viscosity is too large, it is difficult to penetrate into the fiber gap, resulting in the existence of a large number of bubbles in the product, which also affects the quality of the product. Moreover, the high viscosity causes high tension and will inconvenience the winding process.

2.The use period should be long. In order to ensure smooth winding, the gel time of the glue should be greater than 4h.

3.The elongation of the cured resin glue liquid matches the reinforcing material, which can prevent internal stress during curing.

4.The resin glue liquid is solvent-free, so that there are few volatiles and avoid the volatilization of the solvent during the curing process to affect the overall compactness of the product. This is even more important for winding molded insulation parts used in electrical products.

The tube core used for the large-diameter epoxy insulated tube rolled laminated tube is an important tool for the production of laminated tube. Its dimensional accuracy directly affects the accuracy of the inner diameter of the laminated tube, and its surface roughness directly affects the roughness of the inner wall of the laminated tube. During production, transportation and storage, the surface of the die should be protected from bumps and deformation.

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