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Consultants Corner
[image||{UP}MainPage%2fSPEEXDIV-sssm.jpg|http://www.spexdiv.com] ==='''Welcome to ConsultantsCorner'''=== Started in 1972 by Bob Gregory, the Consultants’ Corner articles in the Extrusion Division Newsletter have continued ever since. This 1-0-Wiki section is a compilation of all Consultants’ Corner articles, beginning March, 1974, through December, 2000. Articles (Topics) are organized under the Volume and Number of the newsletter in which they were published, in their original order. For your convenience, you will also find Consultant’s Corner Contents pages for newsletters from 1990 on, in which there are four articles or more. "Items with hyperlinks are completed, items in black with no link remain - Under Construction" * [ScrewFlightWear|Vol. 3 #1, March 1974 - Screw flight wear] * [RapidExtrusionLineStartup|Vol. 3 #2, August 1974 - Rapid extrusion line start up] * [CC V3-3|Vol. 3 #3, December 1974 - Twin screw extruders design and operating characteristics] * [CC V4-1|Vol. 4 #1, April 1975 - Calculating extruder performance] * [CC V4-2|Vol. 4 #2, July 1975 - More on screw flight wear] * [CC V5-2|Vol. 5 #2, November 1976 - Winding strains] * [CC V6-3|Vol. 6 #3, December 1977 - Extrusion technology - some new findings] * [CC V7-1|Vol. 7 #1, March 1978 - The programmable calculator, a tool for measurement of extruder performance] * [CC V7-2-A|Vol. 7 #2, July 1978 - Screw/barrel clearance] * [CC V7-2-B|Vol. 7 #2, July 1978 - Gels] * [CC V7-2-C|Vol. 7 #2, July 1978 - PVC gels] * [CC V7-3-A|Vol. 7 #3, December 1978 - More on the drag flow equation] * [CC V7-3-B|Vol. 7 #3, December 1978 - PVC testing] * [CC V8-1|Vol. 8 #1, August 1979 - Two stage extrusion] * [CC V8-2-A|Vol. 8 #2, August 1979 - Internal bubble cooling] * [CC V8-2-B|Vol. 8 #2, August 1979 - HDPE LDPE properties] * [CC V8-2-C|Vol. 8 #2, August 1979 - Screen pack pressure drop] * [CC V8-3|Vol. 8 #3, December 1979 - Blown film air cooling] * [CC V9-1|Vol. 9 #1, April 1980 - Nylon 6 screw design] * [CC V9-2|Vol. 9 #2, July 1980 - Strand cooling] * Vol. 9 #3, December 1980 - Technical developments * [CC V10-1|Vol. 10 #1, April 1981 - Linear low density polyethylene] * [CC V10-2-A|Vol. 10 #2, August 1981 - Blown film - cooling air parameters] * [CC V10-2-B|Vol. 10 #2, August 1981 - Polycarbonate extrusion] * [CC V11-1|Vol. 11 #1, January 1982 - Extrusion of thermoplastic foams] * [CC V11-2-A|Vol. 11 #2, June 1982 - A new die lip can change your profits] * [CC V11-2-B|Vol. 11 #2, June 1982 - Solvents and thermoplastics separated in CRT extruders] * [CC V11-2-C|Vol. 11 #2, June 1982 - Excessive screw wear] * [CC V11-3-A|Vol. 11 #3, January 1983 - The importance of periodic audits of extrusion performance] * [CC V11-3-B|Vol. 11 #3, January 1983 - Nylon - the great misconception] * [CC V11-3-C|Vol. 11 #3, January 1983 - A case for shorter heating zones in the feed section of extruders] * [CC V11-4|Vol. 11 #4, June 1983 - Gear pumps - answers to questions] * [CC V11-5|Vol. 11 #5, February 1984 - Gear pumps - editorial comment] * [CC V11-5-B|Vol. 11 #5, February 1984 - More on gear pumps] * [CC V11-5-C|Vol. 11 #5, February 1984 - Precision profile extrusion] * [CC V11-6-A|Vol. 11 #6, June 1984 - Designing high performance screws] * [CC V11-6-B|Vol. 11 #6, June 1984 - Purging of extruders] * [CC V11-6-C|Vol. 11 #6, June 1984 - Polymer filtration] * [CC V11-7-A|Vol. 11 #7, September 1984 - Polymer filtration II] * [CC V11-7-B|Vol. 11 #7, September 1984 - More on polymer filtration] * [CC V12-1-A|Vol. 12 #1, February 1985 - Answers - preheating feedstocks for extrusion] * [CC V12-1-B|Vol. 12 #1, February 1985 - Polymer filtration III] * [CC V12-1-C|Vol. 12 #1, February 1985 - On-line quality analysis] * [CC V12-2-A|Vol. 12 #2, June 1985 - Excessive screw wear?] * V12 N2 6/85 - Using shape factors for extrusion die design * [CC V12-3-A|Vol. 12 #3, October 1985 - Is used equipment worth the effort?] * V12 N3 10/85 - Process uniformity * [CC V12-3-C|Vol. 12 #3, October 1985 - Extruder controls] * [CC V13-1-A|Vol. 13 #1, February 1986 - Feed screw temperature control (S.T.C.) in the single screw extruder] * [CC V13-1-B|Vol. 13 #1, February 1986 - The exciting future for cellular profiles] * [CC V13-2-A|Vol. 13 #2, July 1986 - Extrusion and safety] * [CC V13-2-B|Vol. 13 #2, July 1986 - Gage control for tubular film production] * [CC V13-2-C|Vol. 13 #2, July 1986 - Back to basics for profile extrusion] * [CC V13-3-A|Vol. 13 #3, November 1986 - Trade secrets] * [CC V13-3-B|Vol. 13 #3, November 1986 - Some considerations in drying] * [CC V13-3-C|Vol. 13 #3, November 1986 - "The wonderful world of extrusion expertise…"] * [CC V14-1-A|Vol. 14 #1, February 1987 - Coextrusion: opportunities and challenges] * [CC V14-1-B|Vol. 14 #1, February 1987 - Old vs. new extruders] * [CC-V14-2-A|Vol. 14 #2, June 1987 - A bomb, a gun, or a useful tool] * [CC-14-2-B|Vol. 14 #2, June 1987 - Coextruded - why?] * [CC-V14-3-A|Vol. 14 #3, November 1987 - Rheometers versus melt index for polymer analysis] * [CC-V14-3-B|Vol. 14 #3, November 1987 - Linear optimization of film charting] * V15 N1 2/88 - Performance of twin-screw extruders * V15 N1 2/88 - Basic film calculations * [CC-V15-2-A|Vol. 15 #2, July 1988 - Theoretical extrusion predictions] * [CC-V15-2-B|Vol. 15 #2, July 1988 - Sheet/film coextrusion grows] * [CC-V15-2-C|Vol. 15 #2, July 1988 - Extrusion dies] * [CC-V15-2-D|Vol. 15 #2, July 1988 - Extrusion with plugged vented barrel extruders] * V15 N3 11/88 - Shear rate and what it means * [CC-V15-3-A|Vol. 15 #3, November 1988 - Problems plus creative input equal opportunities] * V15 N3 11/88 - Mixing myths * V16 N1 2/89 - SPC is here for extrusion * [CC-V16-1-A|Vol. 16 #1, February 1989 - Selection and maintenance of cooling rolls] * [CC-V16-1-B|Vol. 16 #1, February 1989 - Film and sheet pinning techniques to promote heat transfer to cooling rolls] * [CC-V16-2-A|Vol. 16 #2, December 1989 - Water cooling extruders] * [CC-V16-2-B|Vol. 16 #2, December 1989 - Heating modes for extruder barrels:] * [CC-V16-2-C|Vol. 16 #2, December 1989 - Barrel and screw wear] * [CC-V16-2-D|Vol. 16 #2, December 1989 - Ten key principles of extrusion] * [CC-V17-1-A|Vol. 17 #1, February 1990 - On/off barrel cooling control] * [CC-V17-1-B|Vol. 17 #1, February 1990 - Extrusion screw wear] * V17 N1 2/90 - Tubing draw down ratio * [CC-V17-2-A|Vol. 17 #2, July 1990 - Gauge control] * Vol. 17 #2, July 1990 - Calculating DC drive power * [CC-V17-2-B|Vol. 17 #2, July 1990 - Gearbox design ratings] * [CC-V17-2-C|Vol. 17 #2, July 1990 - An expert witness] * V17 N1 7/90 - Structural changes in PVC due to extrusion * [CC-V17-2-D|Vol. 17 #2, July 1990 - Vector forces in extrusion design] * V17 N3 12/90 - The effect of pressure on output * [CC-V17-3-A|Vol. 17 #3, December 1990 - Scaling up the extrusion process] * [CC-V17-3-B|Vol. 17 #3, December 1990 - Alternatives for extruder barrel construction] * [CC-V17-3-C|Vol. 17 #3, December 1990 - Pressure gauge] * [CC-V17-4-A|Vol. 17 #4, March 1991 - Borescoping an extruder] * [CC-V17-4-B|Vol. 17 #4, March 1991 - Thermocouple depth] * [CC-V18-2-A|Vol. 18 #2, July 1991 - Extruder surging] * V18 N2 7/91 - Causes of extruder surging * [CC-V19-1-A|Vol. 19 #1, February 1992 - Notes on polyethylene extruder surging] * V19 N1 2/92 - How to setup a correct heat profile * V19 N1 2/92 - Distributive mixing and energy distribution in twin screw extruders * [CC-V19-2-A|Vol. 19 #2, June 1992 - Melt blockage problems - styrene extruders running at high output rates] * [CC-V19-2-B|Vol. 19 #2, June 1992 - Melt block problems] * [CC-V19-2-C|Vol. 19 #2, June 1992 - Further comments on barrel profiles] * V19 N2 6/92 - Extrusion of Nylon 66 simplified from melt rheology data * [CC-V19-3-A|Vol. 19 #3, November 1992 - How effective are purge compounds] * [CC-V19-3-B|Vol. 19 #3, November 1992 - Machinery installation] * [CC-V19-3-C|Vol. 19 #3, November 1992 - Barrel heater maintenance and installation] * [CC-V19-3-D|Vol. 19 #3, November 1992 - Thickness uniformity in blown film extrusion] * [CC-V19-3-E|Vol. 19 #3, November 1992 - Screw cooling in extrusion] * [CC-V19-3-F|Vol. 19 #3, November 1992 - Surging] * [CC-V19-3-G|Vol. 19 #3, November 1992 - Modular screw assembly] * [CC-V19-3-H|Vol. 19 #3, November 1992 - Thrust bearings] * [CC-V20-1-A|Vol. 20 #1, March 1993 - Used extruders] * [CC-V20-1-B|Vol. 20 #1, March 1993 - Gearcase maintenance] * V20 N1 3/93 - Effect of temperature * [CC-V20-2-A|Vol. 20 #2, July 1993 - Don't always blame the extruder] * [CC-V20-2-B|Vol. 20 #2, July 1993 - Upstack vs. downstack] * [CC-V20-2-C|Vol. 20 #2, July 1993 - Borescoping] * [CC-V20-2-D|Vol. 20 #2, July 1993 - Extruder alignment] * [CC-V20-2-E|Vol. 20 #2, July 1993 - Where's the wear?] * [CC-V20-2-F|Vol. 20 #2, July 1993 - Being an expert witness] * [CC-V20-3-A|Vol. 20 #3, July 1993 - Where's the Wear? Part II] * [CC-V20-3-B|Vol. 20 #3, July 1993 - Heater replacement] * [CC-V20-3-C|Vol. 20 #3, July 1993 - Screw tip to screen changer] * [CC-V20-3-D|Vol. 20 #3, July 1993 - Drive overload] * [CC-V20-3-E|Vol. 20 #3, July 1993 - MD flow lines] * [CC-V20-3-F|Vol. 20 #3, July 1993 - Purging of extruders (1993)] * V21 N1 6/94 - AC drive update * [CC-V21-1-A|Vol. 21 #1, June 1994 - Single screw feeding] * [CC-V21-3-B|Vol. 21 #1, June 1994 - Defining screw performance] * [CC-V21-1-C|Vol. 21 #1, June 1994 - Screw and barrel wear] * [CC-V21-1-D|Vol. 21 #1, June 1994 - Melt blockage due to false start up will cause dramatic rate drop] * [CC-V21-1-E|Vol. 21 #1, June 1994 - Feed throat cooling (Consultant's Corner)] * [CC-V21-1-F|Vol. 21 #1, June 1994 - Profile die for PVC and HIPS] * [CC-V21-1-G|Vol. 21 #1, June 1994 - Coextruded sheets] * [CC-V21-2-A|Vol. 21 #2, October 1994 - Single screw root wear] * [CC-V21-2-B|Vol. 21 #2, October 1994 - Extruders that have been exposed to fire] * [CC-V21-2-C|Vol. 21 #2, October 1994 - 30/30 melt temperature measuring method] * [CC-V21-2-D|Vol. 21 #2, October 1994 - How to buy a screw - Part I] * [CC-V21-3-A|Vol. 21 #3, December 1994 - Synthetic lubricants for extruders?] * V21 N3 12/94 - How to buy a screw, Part II * [CC-V21-3-C|Vol. 21 #3, December 1994 - Carbon black dispersion] * [CC-V21-3-D|Vol. 21 #3, December 1994 - Temperature contro] * [CC-V22-1-A|Vol. 22 #1, May 1995 - Pyrometers] * [CC-V22-1-B|Vol. 22 #1, May 1995 - How to buy a screw - part III] * [CC-V22-1-C|Vol. 22 #1, May 1995 - Save money - monitor the little things] * [CC-V22-1-D|Vol. 22 #1, May 1995 - Screw costs] * [CC-V22-1-E|Vol. 22 #1, May 1995 - Naming screws for materials, compression ratios] * [CC-V22-1-F|Vol. 22 #1, May 1995 - Misalignment] * [CC-V22-1-G|Vol. 22 #1, May 1995 - Cross contamination] * [CC-V22-1-H|Vol. 22 #1, May 1995 - Gear reducer] * [CC-V22-1-I|Vol. 22 #1, May 1995 - Consultant travel tips] * [CC-V22-2-A|Vol. 22 #2, September 1995 - Sources of gels] * [CC-V22-2-B|Vol. 22 #2, September 1995 - Optimization of cast aluminum barrel coolers] * [CC-V22-2-C|Vol. 22 #2, September 1995 - Purge compound and tool/die cleaning] * [CC-V22-2-D|Vol. 22 #2, September 1995 - Buying used extrusion equipment] * [CC-V22-2-E|Vol. 22 #2, September 1995 - Cleaning dies] * [CC-V22-3-A|Vol. 22 #3, December 1995 - Planning the extrusion line] * [CC-V22-3-B|Vol. 22 #3, December 1995 - Blown film versus the cast film process] * [CC-V22-3-C|Vol. 22 #3, December 1995 - Correcting flow instability in coextrusion] * [CC-V22-3-D|Vol. 22 #3, December 1995 - Additives - be careful!] * Vol. 23 #1, May 1996 - Heat transfer in extruders - an introduction * V23 N1 5/96 - Polymer devolatilization * [CC-V23-1-A|Vol. 23 #1, May 1996 - Shop foremen] * V23 N2 10/96 - "Wave" pattern instability in multilayer coextrusion * V23 N3 12/96 - Retrofitting a screw into an existing extruder * [CC-V23-3-A|Vol. 23 #3, December 1996 - Extruder drives] * [CC-V23-3-B|Vol. 23 #3, December 1996 - Worn barrel repair] * [CC-V23-3-C|Vol. 23 #3, December 1996 - Compounding of blends] * [CC-V23-3-D|Vol. 23 #3, December 1996 - Chrome plated steel casting drums] * [CC-V23-3-E|Vol. 23 #3, December 1996 - Stability on single screw extruders] * [CC-V23-3-F|Vol. 23 #3, December 1996 - Pressure transducer calibration] * V24 N1 3/97 - Downstream mixing in twin screw extruders * [CC-V24-1-A|Vol. 24 #1, March 1997 - Immersed thermocouples] * [CC-V24-2-A|Vol. 24 #2, September 1997 - Interfacial instabilities during coextrusion of LDPEs] * [CC-V24-2-B|Vol. 24 #2, September 1997 - Cord connected equipment] * V24 N2 9/97 - Lost output * [CC-V24-2-C|Vol. 24 #2, September 1997 - Pelletizing die cleaning] * [CC-V24-2-D|Vol. 24 #2, September 1997 - Material flowability] * [CC-V24-2-E|Vol. 24 #2, September 1997 - Ten myths about gear lubrication] * V24 N3 12/97 - Extrusion evaluation through pressure and melt temperature analysis * V24 N3 12/97 - Screw installation and removal * V24 N3 12/97 - Casting of extruded semi-crystalline film and sheet * V24 N3 12/97 - Troubleshooting polymer processing operations * [CC-V24-3-C|Vol. 24 #3, December 1997 - Single screw mixing] * [CC-V24-3-D|Vol. 24 #3, December 1997 - Sticking of extruded sheet] * [CC-V25-1-A|Vol. 25 #1, May 1998 - Screen pack selection] * [CC-V25-1-B|Vol. 25 #1, May 1998 - Minimizing flow oscillations for continuous extrusion] * [CC-V25-1-C|Vol. 25 #1, May 1998 - Plastics technology and the web] * [CC-V25-1-D|Vol. 25 #1, May 1998 - Extensional viscosity and melt strength and their role in film blowing] * V25 N2 9/98 - The effects of molecular structure, rheology, morphology and orientation on polyethylene bl * V25 N2 9/98 - Leaking pressure transducers * [CC-V25-2-B|Vol. 25 #2, September 1998 - Proper extruder installation insures optimum performance and safety] * [CC-V25-3-A|Vol. 25 #3, December 1998 - The extruder drive] * [CC-V25-3-B|Vol. 25 #3, December 1998 - Vent flow] * [CC-V25-3-C|Vol. 25 #3, December 1998 - Feed stability] * [CC-V25-3-D|Vol. 25 #3, December 1998 - How to determine if a gear pump is right for you] * [CC-V25-3-E|Vol. 25 #3, December 1998 - Melt temperature measurement] * V25 N3 12/98 - Orientation in sheet extrusion and its effect upon quality * [CC-V25-3-F|Vol. 25 #3, December 1998 - Check out the obvious] * [CC-V25-3-G|Vol. 25 #3, December 1998 - Cast film - air knives] * [CC-V25-3-H|Vol. 25 #3, December 1998 - Estimating flow rate of a continuous sheet line] * [CC-V25-3-I|Vol. 25 #3, December 1998 - Make a business of your consulting] * V26 N1 3/99 - Polymer drying * [CC-V26-1-A|Vol. 26 #1, March 1999 - Extruder maintenance] * [CC-V26-1-B|Vol. 26 #1, March 1999 - Are you a candidate for a continuous screen changer?] * [CC-V26-1-C|Vol. 26 #1, March 1999 - Coextruded multilayer distribution] * [CC-V26-1-D|Vol. 26 #1, March 1999 - Maximum rate of an extruder] * V26 N1 3/99 - Casting of extruded semi-crystalline film and sheet edge curl in sheet casting * [CC-V26-1-E|Vol. 26 #1, March 1999 - Project management] * [CC-V26-2-A|Vol. 26 #2, September 1999 - The use of statistics in extrusion] * V26 N2 9/99 - An introduction to statistics * V26 N2 9/99 - You can get more from your resin conveying system * [CC-V26-2-B|Vol. 26 #2, September 1999 - Starve feeding] * [CC-V26-2-C|Vol. 26 #2, September 1999 - Volume reduction] * [CC-V26-2-D|Vol. 26 #2, September 1999 - Screw maintenance] * [CC-V26-2-E|Vol. 26 #2, September 1999 - Screw cleaning] * [CC-V26-2-F|Vol. 26 #2, September 1999 - Extruder order specifications] * [CC-V26-2-G|Vol. 26 #2, September 1999 - Extrusion feeding] * [CC-V26-2-H|Vol. 26 #2, September 1999 - Two stage extrusion screws] * [CC-V26-2-I|Vol. 26 #2, September 1999 - DC motor maintenance] * [CC-V26-3-A|Vol. 26 #3, December 1999 - Blown film] * [CC-V26-3-B|Vol. 26 #3, December 1999 - Melt pump design tips] * V26 N3 12/99 - How to get power law viscosity from two melt index values * [CC-V26-3-C|Vol. 26 #3, December 1999 - Horizontal cast film and sheet units] * [CC-V26-3-D|Vol. 26 #3, December 1999 - Die cleaning (Dec 1999)] * [CC-V26-3-E|Vol. 26 #3, December 1999 - Barrels with integral feed throats] * V26 N3 12/99 - Increase your profits by saving resin * [CC-V26-3-F|Vol. 26 #3, December 1999 - Cut to length accuracy for extruded plastic tubing and profiles] * [CC-V26-3-G|Vol. 26 #3, December 1999 - Extrusion process troubleshooting] * V26 N3 12/99 - Imparting shear into the process by modifying feed rate * V27 N1 3/00 - Sheet extrusion equipment for in-line thermoforming * [CC-V27-1-A|Vol. 27 #1, March 2000 - Twin screw extrusion system compounds high levels of metal fillers into polymers] * [CC-V27-1-B|Vol. 27 #1, March 2000 - Feed throat design] * [CC-V27-1-C|Vol. 27 #1, March 2000 - Screw cooling length] * [CC-V27-1-D|Vol. 27 #1, March 2000 - Flow surging] * [CC-V27-1-E|Vol. 27 #1, March 2000 - Materials with feed stability problems] * [CC-V27-1-F|Vol. 27 #1, March 2000 - Material conveying systems] * [CC-V27-1-G|Vol. 27 #1, March 2000 - Troubleshooting tools] * [CC-V27-1-H|Vol. 27 #1, March 2000 - IR temperature probes] * [CC-V27-1-I|Vol. 27 #1, March 2000 - Centrifugal fans] * [CC-V27-1-J|Vol. 27 #1, March 2000 - Mean residence time characterization in corotating twin screw extruder] * [CC-V27-2-A|Vol. 27 #2, November 2000 - Measuring RPM] * V27 N2 11/00 - An introduction to statistics - Part II * [CC-V27-2-B|Vol. 27 #2, November 2000 - Electrical checks] * V27 N2 11/00 - Autogenetic screw operation * [CC-V27-2-C|Vol. 27 #2, November 2000 - AC variable frequency drives] * [CC-V27-2-D|Vol. 27 #2, November 2000 - Safety considerations] * [CC-V27-2-E|Vol. 27 #2, November 2000 - Angel hair] * [CC-V27-2-F|Vol. 27 #2, November 2000 - Continuous soy protein films by twin and single screw extrusion] * [CC-V27-2-G|Vol. 27 #2, November 2000 - Finding what you need on the internet] * V27 N3 12/00 - Twin screw extruder screw design: one, two, three * [CC-V27-3-A|Vol. 27 #3, December 2000 - Profile extruder specifications] * [CC-V27-2-B|Vol. 27 #2, November 2000 - Vent flow in twin screw extruders] * [CC-V27-2-C|Vol. 27 #2, November 2000 - Twin screw extruder operating range] * V27 N3 12/00 - Removing screw elements from splined shafts
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