The mold is an important tool for pultrusion technology, generally consisting of a preforming mold and a forming mold. ① Preforming mold During the pultrusion process, after the reinforcing material is impregnated with resin (or impregnated at the same time), before entering the forming mold, it must pass through a preforming mold composed of a group of yarn guide elements. The function of the preforming mold is to gradually form a preformed body with a shape and size similar to the mold control shape according to the cross-sectional configuration of the profile, and then enter the forming mold, so as to ensure that the yarn content of the product section is uniform. ② Forming mold The ratio of the cross-sectional area of ​​the forming mold to the cross-sectional area of ​​the product should generally be greater than or equal to 10 to ensure that the mold has sufficient strength and rigidity, and the heat distribution is uniform and stable after heating. The length of the pultrusion die is determined according to the traction speed and the curing speed of the resin gel during the forming process to ensure that the product reaches the demoulding curing degree when it is pulled out. Generally, steel chrome plating is used, and the surface of the mold cavity is required to be smooth and wear-resistant to reduce the friction resistance of pultrusion and increase the service life of the mold.

The high-quality steel selected for mold manufacturing adopts advanced forging technology and carries out efficient heat treatment. It provides a strong guarantee for CNC simulation fine grinding and super electrostatic precision polishing. The surface is hard chrome plated, so that the mold hardness is enough to reach HRC58-62, the inner cavity finish is 0.0025, and the straightness reaches 0.0025. The mold steel has a dense internal structure, uniform hardness, and stable material. As a senior professional mold manufacturer, we are well aware of the importance of material quality and stability to mold manufacturing. In today’s highly competitive market, even if customers can buy some very cheap molds, problems of one kind or another may occur during processing and production, and the processing fee and time lost far exceed the value of the mold itself. Therefore, a mold supplier with stable quality and reputation is very important to pultrusion profile manufacturers.