Railroad tie and method for making same

作者: William J. Krygsman , Gregory P. Krouse , Henry W. Sullivan

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摘要: Thermoplastic polymers, rubbery polymeric components and reinforcing fillers are mixed heated to a range of 380° F. 440° The resulting mixture is then fed into Banbury mixer, with the diverter feeding two molds. velocity piston each mold being filled controlled thereby control density molded product along its length. As filled, it deposited in cool water bath (50° F.-60° F.) while next filled. molds sequentially transferred an air cooling rack complete process. A texture, generally comprising indentations perpendicular longitudinal axis on object, provides frictional surface between railway crosstie ballast beneath crosstie.