Rail plastic dowel is also called rail plastic sleeve/plastic insert/concrete dowel/ It is pre-embedded into concrete sleepers, together with sleeper screw, rail pad and rail insulator to fix the rails.
In a rail fixing system, rail plastic dowel can be regarded as a fixed foundation because it needs to be separately pre-inserted into the concrete sleeper before assembling the rail fixing system parts. Used to ensure a good connection between the rail fastening system and the concrete sleepers.
On the other hand, similar to the rail pad or rail insulator, another function of rail plastic is to isolate the fastener part from the connector. Therefore, the quality of the Rail plastic dowel pre-inserted into concrete sleepers is very important , especially its strength and fatigue life, is very important for the entire railway line. The combination of the Sleeper screw and the plastic insert makes the backing plate fasten to the sleeper by the rail clip. It has enough elasticity range to avoid loosening of the rail bolts and reduce maintenance work.
Rail plastic dowel is classified according to the material it needs: PA66 or HDPE, depending on the customer's different technical specifications, as follows:
Rail plastic dowel
For different sizes of sleeper screw
PA66: Nylon 66.69%, glass fiber 30%, other 1%
.Yellow, black, white etc