How To Choose The High Quality Screw And Barrel For Plastic Extruder

In this era of rapid development of plastic industry, the application of plastic extruder is more and more widely paid attention to and familiar with. Plastic extruder (host) can be matched with pipe, film, holding material, single wire, flat wire, packing belt, extrusion net, plate (sheet) material, profile, granulation, cable coating and other plastic molding auxiliary machine, to form a variety of plastic extrusion molding production line, the production of various plastic products. Therefore, no matter now or in the future, plastic extrusion machinery is one of the widely used machines in the plastic processing industry.

The screw and barrel used by the plastic extruder is one of the core parts of the equipment, which has an important impact on the plasticization, kneading and molding of plastics. Therefore, the reasonable selection of screw structure and parameters is one of the preconditions to improve product quality and output value. High-quality parts can better ensure normal production, improve the yield rate, output and other key data. To adapt to the needs of different plastic processing. There are many kinds of screw structure, there are three common: gradual type (equal depth and unequal distance or equal depth and unequal depth and unequal distance), sudden type, torpedo head type, etc.

So, how to choose the screw of the plastic extruder? Jed Machinery suggests selecting high quality screw and barrel from the following aspects:

1,According to the extrusion production needs of the extruder, reasonable selection of barrel and screw manufacturing materials, generally will choose the alloy steel with small heat deformation, wear resistance and corrosion resistance. At present, 38CrMoAIA alloy steel is the most widely used material in China, and the metal surface in contact with the material is subjected to secondary heat treatment or coating spraying to optimize the material performance. We can make a certain choice from the material.

2, Screw blank choose forging material, will obtain better physical properties.

3,The inner wall of the barrel and the outer circle of the screw need precision machining, and the accuracy requirement should reach or exceed the accuracy requirement of grade 8.

4, Screw thread outer circle and drive shaft to maintain concentric accuracy, theoretically the higher the accuracy, the better, but because the actual machining will always have a certain error, this error needs to be controlled within 10μm.

5,If the barrel and screw need to install water cooling channel, it is necessary to do hydraulic test in advance, and there is no water infiltration phenomenon for 5 minutes under the water pressure of 0.3Mpa.

6,The gap between the inner wall of the barrel and the outer circle of the screw is strictly controlled, which should not be too large or too small.

7,For example, some parallel twin screw extruders use segmented detachable barrel. Each section of barrel needs to be coordinated directly and continuously, and the center is concentric and the material will not overflow from the joints.

The choice of screw should follow the design law of screw, suitable for location, reasonable selection, Jed machinery and you share the design elements of plastic extruder screw, screw design structure is different, the output is 15%~50% higher. Excellent technology, meet the standard plasticizing performance. Strict implementation of 45 technological processes, the local position of the screw to increase the wear-resistant alloy surfacing, further extend the service life, life extension of 30%. Is a good helper for you to choose the right screw.Customized hotline/Whatsapp: +8613567672668, wechat with the same number.Email:[email protected]