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Warm congratulations on the official launch of our company's official website!
Mar 21,2024
Our company is located in Suzhou Industrial Park, a national development zone. The company has been committed to medical devices, food packaging, precision electronics, etc...
Generally required products are still mainly made of PMMA, while PET needs to be stretched to obtain good mechanical properties, so it is mostly used in packaging and containers.
2) Process characteristics during injection molding
i. Process characteristics of PMMA
PMMA has high viscosity and slightly poor fluidity, so it must be injection molded with high material temperature and high injection pressure. The impact of injection temperature is greater than the injection pressure, but increasing the injection pressure will help improve the shrinkage rate of the product. The injection temperature range is wide, the melting temperature is 160°C, and the decomposition temperature reaches 270°C, so the material temperature adjustment range is wide and the processability is good. Therefore, to improve fluidity, we can start with the injection temperature. It has poor impact resistance, poor wear resistance, is easy to scratch, and is easy to be brittle. Therefore, the mold temperature should be increased and the condensation process should be improved to overcome these defects.
ii. Process characteristics of PC
PC has high viscosity, high melt temperature, and poor fluidity. Therefore, it must be injected at a higher temperature (between 270-320T). Relatively speaking, the material temperature adjustment range is narrow, and the processability is not as good as PMMA. The injection pressure has little effect on the fluidity, but due to the high viscosity, the injection pressure still needs to be higher. Correspondingly, in order to prevent the generation of internal stress, the pressure holding time should be as short as possible. The shrinkage rate is large and the dimensions are stable, but the internal stress of the product is large and it is easy to crack. Therefore, it is better to increase the temperature rather than the pressure to improve the fluidity, and to reduce the possibility of cracking by increasing the mold temperature, improving the mold structure and post-processing. When the injection speed is low, defects such as ripples are prone to occur at the gate. The temperature of the radiation nozzle must be controlled separately, the mold temperature must be high, and the resistance of the runner and gate must be small.
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Warm congratulations on the official launch of our company's official website!
Mar 21,2024
Our company is located in Suzhou Industrial Park, a national development zone. The company has been committed to medical devices, food packaging, precision electronics, etc...
Generally required products are still mainly made of PMMA, while PET needs to be stretched to obtain good mechanical properties, so it is mostly used in packaging and containers.
2) Process characteristics during injection molding
i. Process characteristics of PMMA
PMMA has high viscosity and slightly poor fluidity, so it must be injection molded with high material temperature and high injection pressure. The impact of injection temperature is greater than the injection pressure, but increasing the injection pressure will help improve the shrinkage rate of the product. The injection temperature range is wide, the melting temperature is 160°C, and the decomposition temperature reaches 270°C, so the material temperature adjustment range is wide and the processability is good. Therefore, to improve fluidity, we can start with the injection temperature. It has poor impact resistance, poor wear resistance, is easy to scratch, and is easy to be brittle. Therefore, the mold temperature should be increased and the condensation process should be improved to overcome these defects.
ii. Process characteristics of PC
PC has high viscosity, high melt temperature, and poor fluidity. Therefore, it must be injected at a higher temperature (between 270-320T). Relatively speaking, the material temperature adjustment range is narrow, and the processability is not as good as PMMA. The injection pressure has little effect on the fluidity, but due to the high viscosity, the injection pressure still needs to be higher. Correspondingly, in order to prevent the generation of internal stress, the pressure holding time should be as short as possible. The shrinkage rate is large and the dimensions are stable, but the internal stress of the product is large and it is easy to crack. Therefore, it is better to increase the temperature rather than the pressure to improve the fluidity, and to reduce the possibility of cracking by increasing the mold temperature, improving the mold structure and post-processing. When the injection speed is low, defects such as ripples are prone to occur at the gate. The temperature of the radiation nozzle must be controlled separately, the mold temperature must be high, and the resistance of the runner and gate must be small.
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