Hot-melt extrusion is one of the most widely applied processing technologies in the plastic, rubber and food industry. Today this technology has found its place in the array of pharmaceutical manufacturing operations. Melt extrusion process are currently applied in the pharmaceutical field for the manufacture of a variety of dosage forms and formulations such as granules, pellets, tablets, supp...

The yield criterion of many metallic materials differs from the von Mises criterion. However, available upper bound solutions are almost all restricted to this objective present paper was derive an solution based on a generalized for evaluating extrusion and drawing force, assuming conical die. method conventional used in conjunction with development is necessary, since work function not readil...

This paper presents the solutions for plane-strain extrusion of porous material. We consider problem a stationary plastic flow through wedge shaped die. neglect friction between die and deformed material since it is rather negative effect should be avoided in manufacturing. The elliptic Green type yield condition its piecewise-linear approximation are adopted this problem. In last case, we obta...

A comprehensive study of the three-layer film coextrusion was performed. Plasticized wheat starch (PWS) was chosen as the film central layer, and poly(ester amide) (PEA) was used as the surface outer layers. Singlescrew extruders and a standard feedblock attached to a flat coat-hanger die were used to prepare the three-layer films. The layer deformation and interfacial instability phenomena, in...

The sharkskin surface instability is commonly observed in the extrusion of polymer melts. We present a series of experiments in which a specifically designed rectangular slit die with insulated and independently heated sides and is used to induce precise temperature gradients across a flowing polyethylene melt. Our previous experiments demonstrated that the character of the surface distortions ...

Higher-powered electronics are being integrated into automobiles rapidly. With these electronics comes a problem of how to cool this equipment economically. Heatsink costs have not benefited nor adapted to the high volume nature of automotive electronics. Specially shaped heatsinks are much more efficient for a given size than aluminum extrusion-based ones, most prevalent used in automobiles. H...

This paper discusses two major issues: (i) understanding the influence of solvent used for fibre processing to obtain flame-retardant chicken feathers, and (ii) establishing importance fibre–matrix blending temperature before composite manufacturing. Three profiles extrusion die have been taken into consideration: a low-temperature profile (40 °C) (LT-FRCF), medium-temperature (120 (MT-FRCF), h...

Abstract In foam extrusion, process parameters, material properties, and the blowing agent have an influence on resulting properties. For safety environmental reasons, carbon dioxide (CO 2 ) has gained importance as a physical for production of low‐density polystyrene sheets. The sole use CO often leads to corrugation, open cell structures, or surface defects sheet. As alternative, mixtures bas...