Journal of Korean Society for Quality Management (품질경영학회지)

Korean Society for Quality Management (한국품질경영학회)
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A Case Study of Applying Mixture Experimental Design to Enhance Flame Retardancy of Wood-Plastic Composites

합성목재의 난연성 확보를 위한 혼합물 실험계획 사례

  • Seo, Ho-Jin (Department of Industrial and Systems Engineering, Gyeongsang National University) ;
  • Kwon, Minseo (Sejong Deck) ;
  • Lee, Gun-Myung (Department of Mechanical Engineering, Gyeongsang National University) ;
  • Ju, Hyejin (Department of Industrial and Systems Engineering, Gyeongsang National University) ;
  • Byun, Jai-Hyun (Department of Industrial and Systems Engineering, Gyeongsang National University)
  • 서호진 (경상국립대학교 산업시스템공학부) ;
  • 권민서 (세종데크) ;
  • 이건명 (경상국립대학교 기계공학부) ;
  • 주혜진 (경상국립대학교 산업시스템공학부) ;
  • 변재현 (경상국립대학교 산업시스템공학부)
  • Received : 2022.02.02
  • Accepted : 2022.02.28
  • Published : 2022.03.31
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Abstract

Purpose: This paper addresses a case study of developing a flame retardant wood-plastic composites (WPC) by adding tannic acid to the existing synthetic wood. The optimal mixing ratios of six components are explored to minimize the burning time using two mixture designs. Methods: In the preliminary experiment, six components are considered to find important components and their ranges. Seven D-optimal mixture design points are generated. Two points are removed for the balance of plastic components to be maintained, and the remaining five points are augmented with two basic compositions. Four components are selected to be considered in the main experiment. In the main experiment, pellets are extruded at the eight mixture design points. In-house testing of burning time is executed three times. Specimens made of pellets from two promising flame retardant compositions are sent to the accredited laboratories and tested. Results: The test results are as follows: 1) The best composition (Wood flour, Tannic acid, PE, Lubricant) = (25, 41, 10, 2) (wt%) shows the burning time of 1 second, which is 9-fold improvement compared to the the burning time of 9 seconds from the existing composition (58, 0, 10, 2) (wt%). 2) The second best composition (41, 25, 10, 2) (wt%) results in the burning time of 2 seconds. This composition is inferior to the best composition in terms of the flame retardancy, but more economical since it needs less tannic acid which is 100-fold expensive than the wood flour. Conclusion: Flame retardant compositions are found by adding tannic acid to the existing WPC employing optimal mixture designs. This case study will be helpful to practitioners who try to develop new products with additional physical properties with as small number of experimental trials as possible. Future research direction includes exploring conditions which satisfy both performance level and cost limitation simultaneously.

Keywords

Acknowledgement

본 연구는 교육부와 한국연구재단의 재원으로 지원을 받아 수행된 사회맞춤형 산학협력 선도대학(LINC+) 육성사업의 연구결과 입니다(No.2021EG046010106).

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