Structural type
Building block type barrel:

Each barrel can be interchanged, with extremely high processing accuracy and strictly consistent installation dimensions. It can be flexibly combined to meet different process requirements and is currently the most popular barrel structure. 
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Mechanical extruder modular barrel
Split barrel: The barrel body can be opened like a shell, divided into upper and lower leaves, which is easy to clean and maintain, and is often used in scientific research experiments.
Closed barrel: There are no openings on the top, bottom, left or right, suitable for processes that require a closed environment, which can prevent material leakage and the entry of external impurities. 
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Closed barrel of mechanical extruder
Open barrel: Usually used for feeding and venting, there is an opening on the top of the barrel, which is convenient for the input of materials and the discharge of gases during processing. 
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Mechanical extruder open barrel
Closed side feed barrel: There is no opening on the top of the barrel, and the side opening is connected to the side feeder. It is suitable for some special processes that require feeding from the side.
Top opening + side opening barrel: It is used for venting, and the side opening is connected to the side feeder. This structure is generally used in compact process layouts and can achieve both feeding and venting functions simultaneously. 
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The mechanical extruder is equipped with a top opening and a side opening barrel. The liquid feeding cylinder: There is a small threaded hole on the upper part of the cylinder body, which is used to connect the liquid injection gun or the liquid injection needle valve, facilitating the injection of liquid materials into the cylinder.