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  • What is the effect of too high temperature during injection molding?

    Discussion in 'Plastic moulding' started by MIA WANG, Oct 15, 2021.

    1. MIA WANG

      MIA WANG Member

      Sep 2021
      Likes Received:
      1. Too high temperature will reduce the viscosity of the oil: when the temperature of injection molding is too high, the viscosity of the oil will decrease, and leakage may increase. At this time, the volumetric efficiency of the pump and the efficiency of the entire system will also be obvious. reduce. If the viscosity of the oil decreases, the oil film of the moving parts such as the slide valve will become thin or the phenomenon of being cut slope will appear. At this time, the frictional resistance will also increase, which will increase the phenomenon of wear.

      2. Accelerate the deterioration of the oil due to oxidation: Excessive heating of the injection molding process will accelerate the oxidation and deterioration of the oil, resolve the bituminous substance, reduce the service life of the hydraulic oil, and the resolved substance will block the damping orifice and the gap-type valve port , This will cause the pressure valve to get stuck and not work, the metal pipe will be stretched and bent, and even rupture will occur.

      3. Deterioration of the working quality of injection molded parts: Excessive heating of the injection molding process will result in poor working quality of the injection molded parts, and the dissolved air in the oil will escape and air pockets will appear, which will reduce the working performance of the hydraulic system.

      4. Phenomenon that causes mechanical thermal deformation: parts of hydraulic components with different coefficients of thermal expansion should become smaller and get stuck with the trainee, which will cause work failure, seriously affect the transmission accuracy of the hydraulic system, and cause injection-molded parts The quality of work has deteriorated.

      5. It will deform the rubber seals, accelerate the aging failure, reduce the service life of the sealing performance, and cause leakage.

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    3. cnckamikawa

      cnckamikawa New Member

      Dec 2022
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      The quality of the plastic parts will be affected greatly if the temperature is too high. injection molding plastic process is a thermal process. High temperature will make the polymer melt flow more easily so the flow rate of polymer will be higher which might cause sink mark on the part surface. Too high temperature will damage the polymer structure which will result in poor dimensional stability and chemical property. To get the best quality parts, the temperature should be controlled under the recommended level.
    4. rutlandplastics

      rutlandplastics New Member

      May 2023
      Likes Received:
      The effect of excessively high temperature during injection moulding can have several adverse consequences. Firstly, it can lead to thermal degradation of the polymer material being used, resulting in poor product quality. This can manifest as discoloration, reduced mechanical properties, or even the formation of voids or bubbles in the finished parts.

      Moreover, high temperatures can cause the material to flow too quickly, leading to issues like flash, where excess material escapes the mold cavity and forms unwanted protrusions. It can also lead to dimensional instability, warpage, or sink marks in the final product.

      Additionally, elevated temperatures can increase the cycle time, reducing production efficiency and increasing energy consumption. It may also put excessive strain on the machinery and affect the lifespan of the molds.

      To ensure optimal results, it is crucial to maintain the proper temperature range recommended for the specific polymer material being processed during injection moulding.

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