Hello
i am trying to extrude PMMA (powder, from SIGMA) using a twin screw extruder.
220C and 100rpm.
however, the material is coming out black (and also very slowly) pmma shouldn’t degrade until 350C and the extruder is clean (I passed other polymers through it and they did not come out black)
why is my pmma turning black? How can I avoid it?
The Modelling of Extrusion Processes for Polymers—A Review Marko Hyvärinen *, Rowshni Jabeen and Timo Kärki Fiber Composite Laboratory, LUT University, P.O. Box 20, 53850 Lappeenranta, Finland; [email protected] (R.J.); [email protected] (T.K.) * Correspondence: [email protected]; Tel.: +358-40-590-8471 Received: 30 April 2020; Accepted: 4 June 2020; Published: 8 June 2020 Abstract: Extrusion processes are widely used in industries that aim to produce advanced solutions for increasingly sophisticated demands in the plastic, food, and pharmaceutical sectors. Though the process has been in use since the 1930s, limited information is available on the analytical computation of extrusion. Generally, production has been carried out based on empirical experience and trial-and-error approaches. The development of industrial operations is, however, best addressed by modelling the processes involved, and the flow of polymer melts and fibers in extruders has been subjected to some previous studies. Also included an overview of design of a die as well as challenges in sheet/film production. This article systematically and critically reviews the literature related to the process design, machine design, process parameters, flow models, and flow analysis of extrusion with a focus on modelling the extrusion of composite materials.
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