Design & Manufacturing

Korean Society of Die & Mold Engineering (한국금형공학회)
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A Study on the Injection Mold with Superhydrophobic Surface Properties Using Nanosecond Laser Machining

나노초 레이저 가공을 활용한 초소수 표면 특성을 가지는 사출 금형에 관한 연구

  • Jung-Rae Park (Department of mechanical Engineering, INHA University) ;
  • Hye-Jin Kim (Department of mechanical Engineering, INHA University) ;
  • Ji-Young Park (Department of mechanical Engineering, INHA University) ;
  • Si-Myung Sung (Department of mechanical Engineering, INHA University) ;
  • Seo-Yeon Hong (Department of Metals and Materials Process Engineering, INHA University) ;
  • Ki-Hyeok Song (Department of mold, Korea Polytechnics)
  • 박정래 (인하대학교 기계공학과) ;
  • 김혜진 (인하대학교 기계공학과) ;
  • 박지영 (인하대학교 기계공학과) ;
  • 성시명 (인하대학교 기계공학과) ;
  • 홍서연 (인하대학교 금속.재료공정공학과) ;
  • 송기혁 (한국폴리텍II대학 스마트금형과)
  • Received : 2023.09.13
  • Accepted : 2023.09.30
  • Published : 2023.09.30
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Abstract

In this study, an injection mold with ultra-small surface properties was manufactured using nanosecond laser processing. A superhydrophobic characteristic analysis was performed on the PET specimen manufactured through this. To this end, a hydrophobic pattern was defined using the Cassie-Baxter model. The defined features were selected with a spot diameter of 25um and pitch spacing of 30um and 35um. As a result of the basic experiment, it was confirmed that the fine pattern shape had an aspect ratio of 1:1 when the pitch interval was 35um and 20 iterations. Through the determined processing conditions, a hydrophobic pattern was implemented on the core surface of KP4. A specimen with a hydrophobic pattern was produced through injection molding. The height of the molded hydrophobic pattern is 20 ㎛ less than the depth of the core and the contact angle measurement results are 92.1°. This is a contact angle smaller than the superhydrophobic criterion. Molding analysis was performed to analyze the cause of this, and it was analyzed that the molding was not molded due to the lack of pressure in the injection machine.

Keywords

References

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