New and improved railroad tie and method for making same

Details New and improved railroad tie and method for making same New and improved railroad tie and method for making same

C - Chemistry, Metallurgy

08

K

C08K 3/04 (2006.01) B29B 17/00 (2006.01) B29C 39/00 (2006.01) B29C 43/22 (2006.01) B29C 59/02 (2006.01) C08K 3/34 (2006.01) C08L 101/00 (2006.01) E01B 3/44 (2006.01) B29C 31/04 (2006.01) B29C 39/38 (2006.01) B29C 43/46 (2006.01) B29C 47/12 (2006.01) B29C 59/04 (2006.01) B29C 71/02 (2006.01)

Patent

CA 2440117

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(s10), with the resulting mixture fed into a diverter(s16) feeding two molds(s17). The velocity of the piston of each mold being filled is controlled to thereby control the density of the molded product along its length. As each mold is filled, it is deposited in a cool water bath (50 ~F-60 ~F)(s20) 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 corsstie.

L'invention concerne des polymères thermoplastiques, des composants polymères caoutchouteux et des charges renforçantes mélangés puis chauffés à une température allant de 380 ·F à 440 ·F. Le mélange obtenu est ensuite placé dans un mélangeur de Banbury (s10), ledit mélange étant acheminé dans un partiteur (s16) qui alimente deux moules (s17). La vitesse du piston de chaque moule est commandée de manière à pouvoir réguler la densité du produit moulé sur toute sa longueur. Au fur et à mesure que chaque moule est rempli, il est déposé dans un bain d'eau fraîche (50 ·F-60 ·F) (s20) pendant que le moule suivant est en cours de remplissage. Les moules sont séquentiellement acheminés vers un banc de refroidissement à air pour achever le processus. Une texture, comprenant généralement des crans perpendiculaires à l'axe longitudinal de l'objet moulé, permet d'obtenir une surface de frottement entre la traverse de chemin de fer et le ballast situé sous la traverse.

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