Two Standard Gaps of a Co-rotating Twin Screw Extruder

Apr 01,2016

A. Standard Gaps for Co-rotating Twin Screw Extruder

Gap Type

Degree

Formula

Manufacturers & Series

One-side Gap between screw and barrel

DegreeⅠ

（0.003～0.004）×*OD

ZSK series of Coperion Germany, ZE series of Berstoff Germany, Germany Leitz, JSW(Japan), Toshiba Kobe Steel, HPL series of Shanghai Alpha

DegreeⅡ

（0.0045～0.006）×*OD

STS series of Coperion Germany, BASIC series of  Berstof Germanyf, KY Nanjing , etc.

Meshing Gap between two screws

DegreeⅠ

（0.0035～0.006）×*OD

ZSK series of Coperion Germany, ZE series of  Berstoff Germany, Germany Leitz, JSW(Japan), Toshiba Kobe Steel, HPL series of Shanghai Alpha

DegreeⅡ

（0.008～0.012）×*OD

STS series of Coperion Germany, BASIC series of  Berstoff Germany, KY Nanjing , etc

 

B. Data Recommended Theoretically for above Two Gap Degrees

Screw OD of Extruder

25～30

35～43

45～53

55～65

70～80

85～95

One-side Gap between screw and barrel

0.15

0.18～0.20

0.20～0.22

0.20～0.25

0.30～0.35

0.40～0.45

Meshing Gap between two screws

0.15～0.18

0.20～0.25

0.22～0.25

0.25～0.33

0.35～0.45

0.45～0.60

 

C. Generally Used One-side Gap between Screw and Barrel in China

Screw OD

20

30

45

65

90

120

150

200

Gap

Max

+0.18

+0.22

+0.30

+0.35

+0.40

 +0.43

 +0.46

 +0.54

Min

+0.08

+0.10

+0.15

+0.18

+0.22

 +0.25

+0.26

 +0.29

Remarks：

1.One-side gap between screw and barrel is an important factor which effect both properties of products and extruder degree ;

2.Meshing gap between two screws is a significant factor that not only effects materials remaining time inside the barrel and the dispersity & distribution of compounding materials, but also effects the extruder capacity ;

3.In terms of meshing gap between two screws, if same material M2 and same declared useless state, adopting DegreeⅠabove would extend the working life greatly. For instance, elements in plastifying zone would be extended for 3000 hours, elements in disperse zone for material compounding, such as the glass fiber would be extended for 2000 hours, elements in conveying zone would be extended for10000 hours;

4.*OD stands for screw Outer Diameter .

 

Chief Engineer Office

Shanghai Omega Machinery Co.,Ltd

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