| 학회 | 한국화학공학회 |
| 학술대회 | 2016년 가을 (10/19 ~ 10/21, 대전컨벤션센터) |
| 권호 | 22권 2호, p.2137 |
| 발표분야 | 이동현상 |
| 제목 | Evolution of Unyielded Region inside Slot Coating Flow with Viscoplastic Material |
| 초록 | Continuous liquid coating is used to produce various films or sheet-like products, such as adhesive tapes, optical films, display panels, etc. It is also a strong candidate for nanoparticle assembly film production. Slot coating is a popular high-precision coating methods, because the film thickness is directly controlled by the flow rate and substrate speed rather than coating liquid properties. Coating liquid used in this study shows complex non-Newtonian behavior including viscoplasticity, i.e., exhibiting little or no deformation up to a certain level of stress, called yield stress, and the area exhibiting little or no deformation is called unyielded region. From flow visualization and coating window computation, we found that the location of the unyielded region is a function of the gap to thickness ratio. To find out the threshold value for detaching unyielded region from the coating die lip, a simple viscoplastic channel flow model is proposed and analyzed. |
| 저자 | 도관홍, 남재욱 |
| 소속 | 성균관대 |
| 키워드 | 유체역학; 유변학 |
| 원문파일 | 초록 보기 |
