Article Summary: Curing: Reinforcement material impregnated with resin will be compressed laterally when entering the feed area of the mold, and heated to 160C inside the mold according to the resin system used.
Curing: When the resin-reinforced reinforcement material enters the mold feed zone, it will be compressed laterally and heated to 160°C inside the mold according to the resin system used.
Once the peroxide decomposition temperature is reached, an exothermic crosslinking reaction (curing) will begin and it will proceed from the mold surface to the center of the profile.
The resin gels and solidifies, and also generates a lot of friction on the mandrel on the mold wall and in the case of the core. The continuous roving strands oriented in the longitudinal direction absorb the high release forces required. The release agent is introduced into the matrix to reduce friction. The cooling section of the mold feeding area should keep the temperature in the pultrusion direction to avoid premature solidification of the substrate.
Take off: Crawler-type traction devices or hydraulic clamps ensure a continuous process. These devices can be operated individually, jointly or in parallel. Therefore, a takeoff force of 6000 kg or more can be obtained.
Depending on the wall thickness, the reinforcement structure and the complexity of the cross section, the processing speed may vary greatly. It can reach values between 0.02 and 3.0 m/min. With a thermoplastic matrix, a value of 20 m/min can be achieved.