Optimum design of injection mold heater for uniform curing of LSR seal for waterproof connector

방수 커넥터용 LSR Seal의 균일 경화를 위한 사출 금형 히터의 최적 설계

  • Song, Min-Jae (Technical R&D Center, MAXOFT Inc.) ;
  • Cha, Baeg-Soon (Molds & Dies Technology R&BD Group, Korea Institute of Industrial Technology) ;
  • Hong, Seok-Kwan (Molds & Dies Technology R&BD Group, Korea Institute of Industrial Technology) ;
  • Ko, Young-Bae (Molds & Dies Technology R&BD Group, Korea Institute of Industrial Technology)
  • 송민재 (맥소프트(주) 기술연구소) ;
  • 차백순 (한국생산기술연구원 금형기술그룹) ;
  • 홍석관 (한국생산기술연구원 금형기술그룹) ;
  • 고영배 (한국생산기술연구원 금형기술그룹)
  • Received : 2017.05.11
  • Accepted : 2017.07.07
  • Published : 2017.07.31


Automotive waterproof connectors are highly functional parts that must be air-tight in a complex environment. In the LSR multi-cavity injection molding process for manufacturing waterproof connectors, it is important to maintain a uniform curing temperature between the cavities in order to obtain a quality product. For this purpose, we designed the capacity of the cartridge heater differently for each position, and then linked the heat transfer analysis and optimization module to obtain the optimal cartridge heater capacity. As a result of the optimization analysis, the temperature deviation between cavities was decreased from $13.1^{\circ}C$ to $8.1^{\circ}C$ compared with the case in which constant heater capacity was applied, so that the design criterion could be satisfied within a temperature deviation of $10^{\circ}C$ for uniform curing. This study suggests that this method can be applied efficiently to the design of a large area multi-cavity LSR mold heater.


Cartridge heater;Heat transfer analysis;Injection molding;LSR(liquid silicone rubber);Optimization;Waterproof connector


  1. Haberstroh, E., Michaeli, W., Henze, E., "Simulation of the Filling and Curing Phase in Injection Molding of Liquid Silicone Rubber (LSR)" J. Reinf. Plast. Comp. 21, pp. 461-470, 2002. DOI:
  2. M. J. Song, S. K. Hong, Y. B. Ko, J. Y. Choi, E. A. Kim, "A Study on the Design of Mold Heaters for CFRP Thermoforming" Proceedings of the Korean Society for Technology of Plasticity Conference Mold Symposium, pp. 20-25, Aug. 2015.
  3. S. G. Lee, S. T. Won, Y. B. Ko, G. S. Yoon, J. D. Kim, Y. M. Heo, D. E. kim, "Analysis of Key Parameters for Temperature Uniformity Control of the Prepreg Compression Molding Dies" Korean Society Of Precision Engineering 2016 Spring Conference, pp. 521-522, 2016.
  4. J. W. Seo, D. S. Park, S. H. Park, Y. E. Yook, S. K. Kim, T. J. Je, D. S. Choi, "Study on the Micro Pattern Replication and the mold Temperature in Injection Molding" Korean Society Of Precision Engineering 2009 Spring Conference, pp. 901-902, 2009.
  5. M. J. Song, K. H. Kim, S. K. Hong, J. W. Lee, J. Y. Park, G. S. Yoon, H. K. Kim, "Simulation-Based Optimization of Cure Cycle of Large Area Compression Molding for LED Silicone Lens" Advances in Materials Science and Engineering, Vol. 2015, 1-11, 2015. DOI: