① Gravity Feeding:
Principle-Materials enter the barrel by their own weight, including manual feeding, spring feeding, and blower feeding.
Features-Simple structure and low cost. However, it can easily cause uneven feeding, thus affecting the quality of the extruded parts. It is only suitable for small-scale extruders.
② Forced Feeding:
Principle-A device that applies external pressure to the material is installed in the hopper, forcing the material into the extruder barrel.
Features-Overcomes the "bridging" phenomenon, ensuring uniform feeding. The feeding auger is driven by the extruder screw through a transmission chain, ensuring its speed matches the screw speed. An overload protection device can be activated when the feeding port is blocked, thus preventing damage to the feeding device.
