Classification of feeding methods of single screw extruder

① Gravity feeding:
Principle - Materials enter the barrel by their own weight, including manual feeding, spring feeding, and blast feeding.
Features - simple structure and low cost. However, it is easy to cause uneven feeding, thus affecting the quality of the parts. It is only suitable for small size extruders.
② Mandatory feeding:
Principle - Install a device in the hopper that can exert external pressure on the material to force the material into the extruder barrel.
Features: It can overcome the "bridging" phenomenon and make the feeding even. The feeding screw is driven by the extruder screw through the transmission chain, so that its rotational speed adapts to the screw rotational speed. The overload protection device can be activated when the feeding port is blocked, thereby avoiding damage to the feeding device.