Railroad tie and method for making same

Details Railroad tie and method for making same Railroad tie and method for making same

2007-03-27

2007-03-27

Del Sole, Joseph S. (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Control means responsive to product weight or dimension

C425S141000, C425S558000, C425S575000, C425S256000, C425S146000, C425S147000, C249S136000, C249S141000, C249S155000, C249S158000

Reexamination Certificate

active

10808955

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

REFERENCES:
patent: 3477101 (1969-11-01), Fritsch
patent: 4318877 (1982-03-01), Smith
patent: 4626189 (1986-12-01), Hammer et al.
patent: 5082604 (1992-01-01), Valyi
patent: 5370518 (1994-12-01), Sasaki et al.
patent: 5380184 (1995-01-01), Von Holdt, Sr.
patent: 5732858 (1998-03-01), Plastino
patent: 5916503 (1999-06-01), Rettenbacher

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