Design & Manufacturing

Korean Society of Die & Mold Engineering (한국금형공학회)
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The effect of injection molding cooling parameters on shrinkage of plastic roller

사출성형의 냉각 파라미터가 플라스틱 롤러의 수축에 미치는 영향

  • 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)
  • 조성기 (공주대학교 테크노융합대학원 산업디자인.금형융합과) ;
  • 한성렬 (공주대학교 금형설계공학과)
  • Received : 2021.11.15
  • Accepted : 2021.12.31
  • Published : 2021.12.31
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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

References

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