Film series screws

This series of screw is designed for extruding of plates, sheet and membrane products, and it is designed for different types of plate membrane products. The plate type products can adopt the venting type screw, the membrane screw usually adopts the structure complex separation type or the barrier type screw.

Specification: 

Screw diameter:Ø15-Ø30

Aspect ratio:15-46

Product type:

For different plastic products screw can be used: ordinary type, pin type, barrier type, separation type, exhaust type and so on. 

Base material:

1)38CrMoAlA(JIS SACM645)
2)42CrMo(AISI 4140)

Process:

Heat treatment

Nitriding treatment

Technical Parameters:

Nitriding depth: 0.50mm-0.80mm                                
Nitriding hardness: 900-1000HV               
Nitriding: <= Level 1                   
Surface roughness: Ra 0.4                  
Screw straightness: 0.015mm                
The hardness of the surface after chrome plating:≥950HV       
Chromium layer thickness: 0.025~0.085mm          
Double alloy depth: 3mm

 Specification: 

Screw diameter:Ø15-Ø300

Aspect ratio:15-46

 Applicatons

PE waterproof membrane, PETsheet,PP/PE/PS enviromental thermoforming package, ABS/PMMA compostite sanitary ware, ABS/HIPS/GPPS refrigerator plate, PC/PP/PE hollow cross section board, PE aluminum composite sheet, PE/PP package&cast film etc.