사출성형의 냉각 파라미터가 플라스틱 롤러의 수축에 미치는 영향

The effect of injection molding cooling parameters on shrinkage of plastic roller

A plastic roller for opening and closing the safety door of the injection molding machine was molded. Thedimensional change of the measurement position of the roller was studied when the cooling time was applied differentlyamong the molding conditions, and when the temperature of the coolant applied for mold cooling was also applieddifferently. Cooling times of 300 seconds and 400 seconds, hot and low-temperature coolant were applied. When thelow-temperature coolant was applied, the measuring point of the roller shrank by 0.03 mm. However, when thehigh-temperature coolant was applied, the measuring point shrank by 0.3 mm. It was found that the application oflow-temperature coolant among coolants was more suitable for the reference dimension of the molded article comparedto the application of high-temperature coolant. Among the cooling water applied for the molding of plastic rollers, whenhigh-temperature coolant is applied, the shrinkage rate measured immediately after ejection was smaller than whenlow-temperature coolant is applied. However, it was found that post shrinkage, which occurs over time, occurs muchlarger when high-temperature coolant is applied.

A plastic roller for opening and closing the safety door of the injection molding machine was molded. Thedimensional change of the measurement position of the roller was studied when the cooling time was applied differentlyamong the molding conditions, and when the temperature of the coolant applied for mold cooling was also applieddifferently. Cooling times of 300 seconds and 400 seconds, hot and low-temperature coolant were applied. When thelow-temperature coolant was applied, the measuring point of the roller shrank by 0.03 mm. However, when thehigh-temperature coolant was applied, the measuring point shrank by 0.3 mm. It was found that the application oflow-temperature coolant among coolants was more suitable for the reference dimension of the molded article comparedto the application of high-temperature coolant. Among the cooling water applied for the molding of plastic rollers, whenhigh-temperature coolant is applied, the shrinkage rate measured immediately after ejection was smaller than whenlow-temperature coolant is applied. However, it was found that post shrinkage, which occurs over time, occurs muchlarger when high-temperature coolant is applied.