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Classification and Maintenance of Plastic Extruder

Pulished on Jan. 08, 2021


In the plastic extrusion molding equipment, the plastic extruder is usually called the main machine, and the subsequent equipment, the plastic extrusion molding machine, is called the auxiliary machine.


After more than 100 years of development, plastic extruders have been derived from the original Single-Screw Extruder, including twin-screw extruders, multi-screw extruders, and even screwless extruders.


Single-Screw Extruder

Single-Screw Extruder


Plastic extruder


The plastic extruder (host) can be used with various plastic molding auxiliary machines such as pipe, film, holding material, monofilament, flat wire, strapping, extruding net, board (sheet) material, profiled material, pelletizing, cable coating, etc. Match to form various plastic extrusion molding production lines to produce various plastic products.


Therefore, plastic extrusion molding machinery is one of the widely used models in the plastic processing industry, no matter now or in the future.


Classification of extruders With the wide application and continuous development of plastic extrusion molding technology, the types of extruders are being updated day by day. There are mainly the following 5 types of classification methods.


1. According to the installation position, it can be divided into vertical extruder and horizontal extruder;


2. According to the purpose, it can be divided into extruder for forming, extruder for mixing and drawing and feeding extruder for feeding;


3. According to the number of screws, it can be divided into screwless extruder, single screw extruder, twin screw extruder and multi-screw extruder


4. According to whether it is vented, it can be divided into vented extruder and non-vented extruder


5. According to the screw speed, it can be divided into ordinary extruder, high speed extruder and super high speed extruder.


Maintenance method of extruder


⒈The Plastic Extruder Equipment should be placed in a ventilated position to ensure the heat dissipation of the motor and extend its life; the machine should be well grounded.


⒉Check the tool screws regularly. After using the new machine for 1 hour, tighten the screws of the movable knife and the fixed knife with tools to strengthen the fixation between the blade and the knife holder; lubricate the bearings regularly to ensure the lubricity between the bearings ; In order to ensure the sharpness of the cutting tool, the tool should be checked frequently to ensure its sharpness and reduce unnecessary damage to other parts caused by the blunt blade; regularly check whether the belt is loose and tighten it in time.


⒊Restart--Before the second start, the remaining scraps in the machine room should be removed to reduce the starting resistance. The inertia cover and pulley cover should be opened regularly to clear the ash outlet under the flange, because the crusher room discharges powder The material enters the shaft bearing.


⒋Replacement parts-When changing the cutter, the gap between the movable knife and the fixed knife: 0.8MM for crushers above 20HP is better, and 0.5MM for crushers below 20HP is better. The thinner the recycled material, the larger the gap can be.


The company also provides a Plastic Pelletizing Machine, please feel free to contact if necessary


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