LAKEWOOD, N.J. - Bruce H. Maddock, who just a month earlier had been picked for induction into the Plastics Hall of Fame, died Nov. 9 in Lakewood. Maddock was an extrusion expert who spent nearly all his professional life at Union Carbide Corp.
``Bruce was one of Union Carbide's truly innovative engineering scientists,'' said Carbide Chairman William Joyce.
Maddock, 85, had been afflicted with emphysema for several years, according to the Plastics Academy Inc., which runs the hall of fame.
Maddock will be inducted posthumously into the Plastics Hall of Fame during a dinner June 19 at the NPE 1997 show in Chicago. Carbide's Joyce is the scheduled keynote speaker.
Maddock received a bachelor's degree in engineering physics from the University of Michigan in 1934 and joined Bakelite Corp. in 1936. Union Carbide acquired Bakelite in 1939. He worked at Carbide continuously, with the exception of a three-year period, retiring in 1974 with the title of corporate fellow.
From 1942-1945, he was chief engineer with the Intelin Division of Federal Telephone and Radio Corp. working on plastic-insulated coaxial cables used with radar during World War II.
Throughout his career, Maddock did research and development of single-screw extrusion. When he started in 1936, that process was used only for thermoset rubber. Maddock was a leader in applying extrusion to thermoplastics. His early work formed much of the basis for today's mathematical and computer modeling.
George A. Kruder of Mount Gilead, Ohio, an extrusion expert and himself a Plastics Hall of Fame member, said: ``Bruce Maddock made so many outstanding contributions that I consider him to be the world's greatest contributor to commercially useful extrusion technology.''
Other contributions by Maddock include:
Redesign of the extruder to give greater heating, mixing and metering for thermoplastics.
Technology for coating wire with extruded plastic insulation.
Techniques for extruding film, sheet, pipe and siding for consumer products after World War II.
Establishment of a body of knowledge about how productivity and product quality are affected by temperature, pressure, flow, mixing and other variables.
Invention of the ``push-out'' or ``screw-freeze'' technique for stopping a machine and quickly cooling molten polymer-containing colored tracers for use as test specimens.
Adding a barrier mixing section to the screw, called the Maddock Mixer or the Union Carbide Mixing Head.
Maddock also was active in the Society of Plastics Engineers. He was a founder of what is today SPE's Extrusion Division. He won SPE's highest honor, the International Award, in 1988.