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The backward pumping kneading block plays a role of adjusting the fullness of the material and extending the residence time of the material in the barrel during the material mixing. Its blocking force is weaker than the reverse feed screw sleeve, but slightly stronger than the 90 ° kneading block. Which area should choose the backward pumping kneading block? How to use it with the reverse screw sleeve in the full length? How many reverse elements should be selected for the full length of the screw? All of these questions are testing the experience and skill of the modification engineer, which has a considerable impact on the quality of the modified special material or masterbatch. For example, in the case of nylon (PA66) flame retardant enhanced modification, the first kneading zone must be stringed by four kneading blocks (such as 30 ° + 45 ° + 45 ° ++ 45 ° L), and must be finished by 45 ° L blocks Stuffing, the whole machine can stably plasticize and stably extrude the PA66, a strong crystalline plastic.

Technical Details of Backward Pumping Kneading Block

Brand：LESUN

Model：φ20 mm ~φ300 mm

Material：38CrMoALA / W6Mo5Cr4V2 / HIP

Properties: Wear-resisting, Corrode-resisting

Application: Extruder

Backward Pumping Kneading Block Function

1. Good peformance on shearing material.

2. Good mixing ability to support blending process.

Processing Characteristics of Backward Pumping Kneading Block:

1. All component materials are purcharsed from professional material supplier. To ensure quality of raw materials, element and metallographic analysis are coducted.

2. All components are finished by CNC grinding.

3. Professional technical team can provide surveying and mapping business.

Nanjing Lesun Screw Co.,Ltd is a professional screw and barrel manufacturer. We provide extruder barrel, hexagonal shaft, Extruder Spare Parts, kneading block and so on. Want to know about extruder screw price? Please contact us.