Wall slip as rheological parameter related to processing of powder injection molding feedstocks prone to phase separation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F19%3A63524438" target="_blank" >RIV/70883521:28110/19:63524438 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Wall slip as rheological parameter related to processing of powder injection molding feedstocks prone to phase separation

Popis výsledku v původním jazyce

Commercially available and in-house PIM feedstocks were tested in respect to wall slip, and it was found that at certain flow conditions all are prone to slip. Thus, slip correction cannot be neglected when reliable rheological data are derived, especially for the flow simulations and optimization of injection molding step of PIM. Research results reveal also an importance of surface roughness of flow channels to wall slip development if surface irregularities are higher than a polymer layer formed at flow channel walls. Wall slip velocities decrease with increasing surface roughness. Higher tendency of PIM compounds to wall slip was observed in smaller geometry dies. In addition, wall slip velocities are affected not only by surface roughness and dimension of dies, but also by entrance angle of the testing capillary die. In this respect, lower entrance angle of capillaries is proposed for testing of PIM materials in order to obtain more accurate rheological data.

Název v anglickém jazyce

Wall slip as rheological parameter related to processing of powder injection molding feedstocks prone to phase separation

Popis výsledku anglicky

Commercially available and in-house PIM feedstocks were tested in respect to wall slip, and it was found that at certain flow conditions all are prone to slip. Thus, slip correction cannot be neglected when reliable rheological data are derived, especially for the flow simulations and optimization of injection molding step of PIM. Research results reveal also an importance of surface roughness of flow channels to wall slip development if surface irregularities are higher than a polymer layer formed at flow channel walls. Wall slip velocities decrease with increasing surface roughness. Higher tendency of PIM compounds to wall slip was observed in smaller geometry dies. In addition, wall slip velocities are affected not only by surface roughness and dimension of dies, but also by entrance angle of the testing capillary die. In this respect, lower entrance angle of capillaries is proposed for testing of PIM materials in order to obtain more accurate rheological data.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/LO1504" target="_blank" >LO1504: Centrum polymerních systémů plus</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů