When vacuum is obtained by injecting the resin used to make GRP parts for ships, all ships have an outer shell and inner shell made of glass fiber reinforced plastic, and the resin used is mainly vinyl ester or epoxy resin. In the resin injection process, the H series single stage rotary piston vacuum pump can be used to separate the mold, because it has the reliability of a powerful vacuum pump. Because this is the most successful method that has been tried and tested in daily use. The production of all ships must have completely reliable and accurate parameters, and the factors of temperature, time and vacuum must be precisely coordinated.
2H series two stage rotary piston vacuum pumps are widely used in industrial fields. In the resin infusion process, it is important not only that they reach a vacuum level of 0.1 mbar on a continuous basis, which is equivalent to a vacuum of 99.99%, but also produce a sufficiently high pumping speed in a vacuum. Even if the synthetic core is sealed with aluminum foil very accurately, the leakage may cause a small amount of air to penetrate, and then it needs to be pumped again with a vacuum pump immediately.
The high vacuum performance ensures fast, bubble-free and complete resin infusion. The performance of the H series single stage rotary piston vacuum pump can be controlled by a throttle valve, for example, if it is necessary to prevent the resin from flowing too quickly into the mold. This guarantees a high-quality product and also means that the cost of repair is no longer applicable.
Their oil sealing function means that 2H series two stage rotary piston vacuum pumps are not sensitive to the gases generated during the drying process. These are delivered by a vacuum pump without being compressed. A resin trap is connected upstream of each 2H series two stage rotary piston vacuum pump to prevent resin from entering the vacuum pump.
The rotary piston vacuum pump is quite stable in the resin infusion industry. The rotary piston vacuum pump used in the motor industry can work stably and continuously for three years without the addition of the front resin trap. Although the vacuum pump is in operation during the entire drying process, it has not experienced any failure or shutdown. Maintenance is limited to changing the oil once a year.
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