초록 ▼

A method for the manufacture of a railroad crosstie ( 90 ) from recycled rubber is disclosed. The rubber crosstie ( 90 ) has an expected life of between 30 to 60 years and can be made primarily of rubber crumbs obtained from stockpiles of discarded rubber tires. A feature of the invention is to prod

A method for the manufacture of a railroad crosstie ( 90 ) from recycled rubber is disclosed. The rubber crosstie ( 90 ) has an expected life of between 30 to 60 years and can be made primarily of rubber crumbs obtained from stockpiles of discarded rubber tires. A feature of the invention is to produce a crosstie ( 90 ) having at least one longitudinal side incorporating a plurality of indentations for more effective engagement upon installation into a gravel bed to avoid slippage.

대표청구항 ▼

1. A method for producing a crosstie made substantially from recycled rubber comprising the steps of:providing vulcanized recycled crumb rubber and natural recycled crumb rubber;mixing by weight 10-35% said natural recycled crumb rubber and 65-90% said vulcanized crumb rubber to form a blend; and ad

1. A method for producing a crosstie made substantially from recycled rubber comprising the steps of:providing vulcanized recycled crumb rubber and natural recycled crumb rubber;mixing by weight 10-35% said natural recycled crumb rubber and 65-90% said vulcanized crumb rubber to form a blend; and adding a strength enhancing polymer to said blend, the amount of polymer to add is between 0.0-0.5% of the total weight of said blend;milling said blend at between 240 degrees F. and 370 degrees F. (116-188 deg C.) to form an intermediate product;extruding said intermediate product at between 240 degrees F. and 370 degrees F. (116-188 deg C.) to form an extrusion having a specific width and depth; and,thereafter cutting said extrusion at intervals to yield the croestie having the desired length. 2. The method of producing a crosstie according to claim 1 wherein said strength enhancing polymer is selected from the group comprising neoprene, polyethylene, urethane and ABS. 3. The method of producing a crosstie according to claim 1 further including a means to form a plurality of indentations in at least one side of said extrusion. 4. A crosstie made by an extruder from recycled rubber comprising:A crosstie made entirely of an extrusion containing a blend of substantially no larger than 30 mesh (590 microns) recycled natural crumb rubber and recycled vulcanized crumb rubber in a weight ratio of between 10-35% recycled natural rubber to 65-90% recycled vulcanized rubber and a strength enhancing polymer selected from the group comprising neoprene; polyethylene, urethane, and ABS, where said extrusion exits the extruder at a temperature of between 240-370 degrees F. (116-188 deg C.). 5. The recycled rubber crosstie of claim 4 wherein said crosstie has at least one longitudinal side has a plurality of indentations. 6. A crosstie made from recycled rubber comprising:an extruded crosstie substantially made from a blend of recycled natural crumb rubber and recycled vulcanized crumb rubber where said crosstie comprises a weight ratio of between 10-35% recycled natural rubber and 65-90% recycled vulcanized rubber and where said crosstie further includes a strength enhancing polymer selected from the group comprising neoprene, polyethylene, urethane, and ABS. 7. The recycled rubber crosstie of claim 6 wherein said crosstie has at least one longitudinal side has a plurality of indentations. 8. A crosstie made from recycled rubber comprising:a crosstie substantially made from a blend of recycled natural crumb rubber and recycled vulcanized crumb rubber where said crosstie comprises a weight ratio of between 10-35% recycled natural rubber to 65-90% recycled vulcanized rubber and a strength enhancing polymer selected from the group comprising neoprene, polyethylene, urethane, and ABS where said blend is subjected to a sufficient temperature and pressure to form said crosstie. 9. The recycled rubber crosstie of claim 8 wherein said crosstie has at least one longitudinal side has a plurality of indentations.