Opening book details…
Can I read Surface instabilities during the extrusion of linear low density polyethylene1Dedicated to the memory of Professor Gianni Astarita.1 on EtoBox?
Surface instabilities during the extrusion of linear low density polyethylene1Dedicated to the memory of Professor Gianni Astarita.1 by M.R Mackley; R.P.G Rutgers; D.G Gilbert is a Engineering article available to read on EtoBox.
What is Surface instabilities during the extrusion of linear low density polyethylene1Dedicated to the memory of Professor Gianni Astarita.1 about?
In the film blowing process, LLDPE shows a variety of instabilities with increasing production rate. The purpose of this study is directed at understanding the mechanism underlying the onset and development of the first instability to occur with increasing flow rate. The onset and progress of the surface distortion is studied as a function of process conditions, die geometry and polymer blend composition, using a Betol 20 mm extruder, equipped with an abrupt entry slit die allowing rheo-optical measurements. We show the qualitative characteristics of the surface distortion obtained via scanning electron microscopy and quantitative surface roughness data obtained through stylus surface profile measurements. In a processing window of 160 -200°C, the severity of the instability for LLDPE increases with increasing exit stress level. Under these conditions pure low density polyethylene (LDPE) does not show the instability, but blends of the two materials show significantly enhanced extrudate distortions versus pure LLDPE. It is also shown that pure LDPE does exhibit the same unstable behaviour at lower temperatures around 140°C. Using flow birefringence measurements the stress fields in
Who reads Surface instabilities during the extrusion of linear low density polyethylene1Dedicated to the memory of Professor Gianni Astarita.1?
It is typically read by researchers, students, and practitioners in Engineering.
- Author
- M.R Mackley; R.P.G Rutgers; D.G Gilbert
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0377-0257)
- Published
- 1998
- Language
- EN
- Field
- Engineering (Physical Sciences)