In order to save energy, high-pressure cycling is only used for a brief period before and after plunger injection. The cooling medium is generally water, and a compressor cooling system can be used to form a closed-loop circuit for the cooling liquid. At present, a complete temperature control system should include cooling/heating devices, heat exchangers, sensors for controlling valve actions, etc., and should ultimately achieve a temperature control accuracy of ± 1 ℃.
　　Under colder environmental conditions, it is also necessary to avoid freezing of chemical reaction solutions and local crystallization in isocyanates. Similarly, the EPP insulation box also requires cooling of chemical reactants in reaction injection molding (RM) production, and the amount of cooling energy is equivalent to the mechanical energy input into the high-pressure and low-pressure driving circulation system.
　　Piston type hydraulic cylinder. The hydraulic cylinder power piston extends into each chemical component chamber to provide smooth and accurate propulsion flow control, and can also eliminate or reduce pulsation in the form of "leading" or "lagging". The output ratio of these hydraulic cylinders during the entire injection cycle is within 1% of the measurement accuracy.
　　Inert lubricant system. The inert lubricant system uses a lubrication pump to deliver inert lubricant to the distributor, which then distributes it to various lubrication points to ensure smooth operation of components with relative motion. Due to the use of inert lubricants, there is no risk of chemical contamination or oxidative degradation.
　　Allocate mainstream channels. The main channel can be allocated to introduce each reactant stream into each locking device according to injection requirements. The liquid reaction injection system (LRM) includes four locking devices.
　　Temperature control system. Effective heating devices are essential for mixing and metering systems. During high-pressure cycling, the EPP insulation box sometimes experiences high back pressure due to the high viscosity of the cold material, which can cause the system pressure to exceed the allowable value.