What is the design basics in a press screw conveyor?

1. During transport of the material the volume inside the screw auger is decreased
2. The pitch of the screw rotor can either be decreased or you can make the screw auger conical – also a combination is possible
3. The press process is controlled by the speed of the screw rotor

The succes of the press process depends on the behaviour of the material. You must expect to adjust the process in the final application.

Which parameters can be adjusted in the final application?

1. The speed of the screw auger
2. The pressure to be put on the end plate or a similar obstruction in the outlet

See another example of a dewatering screw conveyor here

How shall you control the material flow to a press screw conveyor?

1. To obtain a good stable result you must be able to control the material flow into the press screw conveyor precisely
2. A suitable method to control the material flow is by using a dosing screw conveyor

It is important that a suitable material control handling system is developed to feed the press screw conveyor. Without such a system  you will not be able to find an optimal operation for the press screw conveyor solution. Working with press screw conveyors require process knowledge. As a machine manufacturing company BEMA can assists in:

1. Easisly development of a revised screw auger to optimize the actual application
2. Designing and manufacturing a dosing screw conveyor system to feed the screw press
3. Designing and manufacturing mechanical components for mechanical drainage

FAQ: Press Screw Conveyor for Dewatering

1. What is a press screw conveyor used for?

A press screw conveyor is a mechanical system designed to dewater wet materials such as insulation waste, processed crops, mixed waste, and by‑products from food manufacturing. It reduces water content efficiently by compressing the material as it moves through the screw auger .

2. How does the dewatering process work?

During transport, the internal volume of the screw auger decreases, either through a reduced pitch, a conical screw design, or a combination of both. This compression forces water out of the material. The process is fully mechanical and controlled by the screw rotor speed, which can be adjusted to optimize performance for different material types .

3. Which parameters can be adjusted during operation?

Operators can fine‑tune the screw speed and regulate the pressure applied to the end plate or outlet obstruction. These adjustments help achieve the desired dryness level, depending on how the material behaves in the press system .

4. How should material flow be controlled for best results?

Stable feeding is essential. A dosing screw conveyor is recommended to ensure precise and consistent material flow into the press screw. Without proper flow control, it is difficult to achieve optimal dewatering performance.