• Title/Summary/Keyword: 잔류 NCO

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Effect of Process Parameters on Residual NCO and Viscosity of Pre-Polymers (Pre-Polymer의 제조에서 공정변수가 잔류 NCO 및 점도에 미치는 영향)

  • Kim, Sang-Oh;You, Man-Hee;Ha, Man-Kyung;Kwak, Jae-Seob
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.7 no.3
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    • pp.61-66
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    • 2008
  • For the production of urethane prepolymer, the effect of process parameters such as diisocyanate MDI and polyol TDI was tested. In this paper, design of experiments has been adopted for studying the effect of the process parameters on the improvement of NCO and viscosity of pre-polymer. As a result of comparison of different parameters, the effect of polyol was stronger than that of isocyanate in comparison of reactivity according to the amounts of isocyanate and polyol. Especially, NCO and viscosity of pre-polymer affected a product safety.

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Development of the Splint Manufacturing Process Using Indirect Coating and Roll Bonding (간접 코팅과 롤 접합을 이용한 의료용 스플린트 제작 및 공정기술 개발)

  • Ha, Kyoung-Ho;Kang, Dae-Min;Lee, Jung-Hee;Kwak, Jae-Seob
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.2
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    • pp.1-6
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    • 2019
  • With the increase in number of the athletic population and elderly demographic, the demand for orthopedic splints, which are used to support a damaged body, has rapidly increased. Current splints mainly consist of inner and outer parts, which are multiple fabrics covered with polyurethane and nonwoven fabrics, respectively. However, the laminated materials with directly applied pre-polymer coating lead to a high defect rate because of the uneven thickness on the surface. Thus, this study proposes an indirect coating method using a precise clearance controller, which enables the even application of the coating material on multiple inner parts while maintaining a constant thickness. In addition, a roll-to-roll (R2R) technique is applied instead of the sewing mechanism to bond the inner and outer materials together and enhance the productivity in the final stage. In the advanced methods, there is a storage tank that contains polyurethane, a clearance controller, and pairs of rollers in the upper and lower rows. To improve the quality of the products and optimize the equipment, three controllable factors are determined: the viscosity of polyurethane, angle of the gap controller and number of pairs of rollers in the R2R system.