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Screw barrel

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Barrel (Pinyin: liaotong English: stuff canister) The barrel is made of excellent seamless steel pipe, which is precision-machined. It is a special barrel for plastic machinery.


1 introduction

Barrel (Pinyin: liaotong English: stuff canister) The barrel is made of excellent seamless steel pipe, which is precision-machined. It is a special barrel for plastic machinery. The barrel has the advantages of high smoothness, high concentricity, all models, good quality, low price, and repairability. The barrel also has a variety of specifications for customers.

2Material

For manufacturing barrels, 45, 40Cr and 38CrMoAIA are currently commonly used in China. The materials used to make the barrels in imported extruders are usually alloy steel 34CrAINi and CrMoV9. The yield strength of this material is about 900 MPa. After nitriding, the hardness is above 1000HV, which is both wear-resistant and has good corrosion resistance.

E.g:

Double alloy barrel:

Double alloy barrels are divided into: tungsten carbide alloy, chromium tungsten carbide alloy, nickel-chromium tungsten carbide alloy. Material Alloy is selected as the material to ensure wear resistance and corrosion resistance and help you solve any engineering plastics problems.

Technical index:

Application classification: Double alloy cylinder for injection molding machine / extruder / bakelite machinery

Processing range: Ф18mm-Ф280mm

Effective length: 3000mm

Alloy composition: 88Wc / 12Co, Crc / 25Nicr, Xoloy108

Alloy hardness: HRC60 ° -65 °

Applicable plastic range: suitable for ABS, PA, PC and more than 30% glass filling. Filling of PMMA, PPS, LCP, ABS fireproof materials and special engineering plastics such as bakelite and LPC.

3 working principle

塑化过程中,其前进和混合的动力都是来源于螺杆和料筒的相对旋转。 In the plasticizing process of plastic , its forward and mixing power comes from the relative rotation of the screw and the barrel. According to the different shapes of plastic in the screw groove, the screw is generally divided into three sections: solid conveying section (also called feeding section), melting section (also called compression section), and homogenization section (also called metering section).

4 Routine Maintenance

1. Do not start the machine when the barrel screw has not reached the preset temperature.

2, to prevent metal fragments and debris from falling into the hopper, if processing recycled materials, you need to add a magnetic hopper to prevent iron filings from entering the barrel.

3. When using anti-salin, make sure that the plastic in the barrel is completely melted, so as not to damage the transmission system parts when the screw is retracted.

4. When using new plastic, the rest of the barrel should be cleaned.

5.When the temperature of the molten plastic is normal, but the black spots or discoloration of the molten plastic are continuously found, the rubber screw should be checked.

6. During processing, try to plasticize the material as much as possible, do not allow metal foreign matter to be mixed into the material, and reduce the rotating torque of the screw barrel.

References

Reference editing area



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