Twin-Screw Extruders: A Basic UnderstandingSpringer US, 1983 - 137 pages Most books on plastics machinery include a preamble on the origin of such equipment, and some even discuss the origin of plastic itself, dating back to the early 1900s and such men as Leo Baekeland - the real founder of synthetic plastics. There seems therefore, little pur pose in reiterating what has been said before and going over the same ground so adequately covered in a number of books as well as the trade press. We are indebted to the author of this excellent treatise on twin-screw extruders for getting right down to the business at hand. The author makes mention of two pioneers - Roberto Colombo and Carlo Pasquetti - who were the first to develop twin-screw ex truders. It was my good fortune to follow the work of these pioneers, and, interestingly enough, the principles were so good that their work continues to be relevant even to the advanced and more sophisticated models so well defmed in this book. |
Contents
SINGLESCREW EXTRUDERS | 1 |
TWINSCREW EXTRUDERS | 7 |
COUNTERROTATING EXTRUDERS | 43 |
Copyright | |
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action angle Atad axially barrel basic bulk density calculated clearance conjugated profiles conjugated screws cooling corotating screws corotating twin-screw extruders counterflighted section counterrotating screws counterrotating twin-screw extruders decreases drag flow energy Enthalpy equal equivalent screw feed section filled flights filling ratio flanks flight tip flight width flight-tip width flow of material frictional coefficient heater bands high shear increase interaxis intermeshing region intermeshing screws length lubricants main motor material fed maximum mechanical mixing section number of filled number of flights operation output capacity particles passages pitch Plast plastics polyethylene polymer polystyrene positive pumping power consumption power dissipated pressure propulsive pumping section Qmax screw configuration screw diameter screw extruders screw speed screw's axis screws rotate shaft shape shear rate single-screw extruders slots smaller specific heat surface thermoplastics thrust bearings tion tip width torque truders twin-screw machines UHMWPE viscosity zone π²