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

Cho, Sung-Gi (Department of Industrial Design and Metal mold Convergence, Kongju National University)
Han, Seong-Ryeol (Department of Metalmold Design Engineering, Kongju National University)
Publication Information
Design & Manufacturing / v.15, no.4, 2021 , pp. 8-13 More about this Journal
Abstract
A plastic roller for opening and closing the safety door of the injection molding machine was molded. The dimensional change of the measurement position of the roller was studied when the cooling time was applied differently among the molding conditions, and when the temperature of the coolant applied for mold cooling was also applied differently. Cooling times of 300 seconds and 400 seconds, hot and low-temperature coolant were applied. When the low-temperature coolant was applied, the measuring point of the roller shrank by 0.03 mm. However, when the high-temperature coolant was applied, the measuring point shrank by 0.3 mm. It was found that the application of low-temperature coolant among coolants was more suitable for the reference dimension of the molded article compared to the application of high-temperature coolant. Among the cooling water applied for the molding of plastic rollers, when high-temperature coolant is applied, the shrinkage rate measured immediately after ejection was smaller than when low-temperature coolant is applied. However, it was found that post shrinkage, which occurs over time, occurs much larger when high-temperature coolant is applied.
Keywords
Coolant Temperature; Cooling Time; Injection Molding; Plastic Roller; Shrinkage;
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