Influence of capillary die geometry on wall slip of highly filled powder injection molding compounds

0481288 - ÚH 2019 RIV CH eng J - Journal Article
Sanétrník, D. - Hausnerová, B. - Filip, Petr - Hnátková, E.
Influence of capillary die geometry on wall slip of highly filled powder injection molding compounds.
Powder Technology. Roč. 325, February (2018), s. 615-619. ISSN 0032-5910. E-ISSN 1873-328X
R&D Projects: GA ČR GA17-26808S
Grant - others:Ministerstvo školství, mládeže a tělovýchovy (MŠMT)(CZ) LO1504
Institutional support: RVO:67985874
Keywords : powder injection molding * highly filled polymer * wall slip * capillary entrance angle
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 3.413, year: 2018

Uneven distribution of solid particles contained in the feedstocks used in the process of powder injection molding (PIM) is observed in the close vicinity of the walls. A particle-free thin layer adjacent to the walls is formed by the binder only and is characterized by so-called wall slip. Wall slip is a key to successful modeling of injection molding step of PIM. For its determination we used capillary rheometers equipped with the dies of different entrance angles applied to four PIM feedstocks. The entrance angle has been found to be a crucial parameter to intercept wall slip. Conical dies are more suitable to obtain reliable slip velocity values of highly filled compounds than capillaries having plane entrance, which are used in the majority of studies.
Permanent Link: http://hdl.handle.net/11104/0279146