Rollers with frustum of thermoplastic resin sectors and with polyamide PA or steel ACC pinion driven with chain links in series. The diagrams and tables on page 78 show the dimensional characteristics and lengths of manufacture. The rollers are produced in the following versions:
- with pinion integral to the jacket for continuous transport;
- with friction pinion for stockpiling transport.
Polyamide resin PA pinions, both integral in Series 673.14 and friction in Series 673.21 are interchangeable. Motor-driven rollers with integral resin PA pinion can reach peripheral speed v = 1 [m/s] max. With steel ACC pinion and with friction pinions, both of resin PA and steel ACC. operate at a speed between v = 0.3 ÷ 0.5 [m/s] max. Normal operating temperature, TN:_5 ÷ +50 [°C].