Plastic injection molding refers to the method of mixing completely melted plastic material with a screw at a certain temperature, injecting it into a mold cavity with high pressure, and obtaining a molded product after cooling and solidification. This process began in the 1920s and has a history of nearly a hundred years. It is a widely used and mature industrial manufacturing technology

Some friends are curious, how to control the temperature of injection molding? Hydraulic oil is generally used for pressure transmission of hydraulic injection molding machines. Appropriate oil temperature can greatly prolong the service life of the machine and improve its stability. The first reason is that the oil seal will age; the second reason is that the expansion coefficient of the oil seal is far from that of the cylinder, which is the main reason for the oil leakage of the hydraulic machine.

So now there are a few injection molding machines that use rare earth metal oil seals. The sealing ring of the cylinder of the injection molding machine is mostly a U-shaped ring, and the material is PU material. Due to the characteristics of polyurethane plastic, its normal working temperature is about -30 to 80°C. If the oil temperature exceeds 55°C, due to the heat conduction of the oil cylinder, the temperature of the sealing ring itself exceeds 55°C when it is still, and frictional heat will be generated when it moves. When the sealing ring rubs against the contact surface of the workpiece, the surface temperature will exceed 100°C, which will greatly shorten the service life of the sealing ring under long-term operation, and the material of the working surface of the sealing ring will accelerate aging and deformation.

Therefore, it is best to keep the oil temperature of the injection molding machine at a low temperature to prevent damage to the sealing ring. Although the optimum working temperature of hydraulic oil is around 45°C, keeping the oil temperature around 35°C has no significant effect on the working performance of the hydraulic system. But not too low, it will affect the action of the hydraulic system. For example, in winter, when the product is just started, the burrs are long and the size is large (the temperature is too low, the viscosity of the hydraulic oil is high, the transmission pressure loss is large, and if the set target value cannot be reached, we will think that it will rise).

Taizhou Minghuang Plastic Mold Co., Ltd. is a professional Plastic Basket Injection Molds Factory. If you need it, you can click the official website to contact us. We are willing to answer you for more information.

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