High quality plastic products requires well designed and precisely manufactured screws. Former’s experience in design, engineering capabilities and CNC controlled up- to- date production line provides production of variety of complex screw geometries with the tightest tolerances. Additionally, Former can advise screw designs which would meet your requirements in the highest level. Related to your process conditions, standard nitrated, full-section hardened or bimetallic material option, whichever best meets your requirements, is adviced.
Classical three zone screw | Counter rotating twin screw | Rubber / silicone screw |
Multi start screw | Co-rotating twin screw | Double Diameter Screw |
Barrier flight screw | Degassing type screw | Dispersive /Distributive Mixers |
The Barrier design screws which separate molten plastics from solid plastics and Grooved fed barrels offer the following advantages;
With the Application of Dispersive and Distributive Mixers;
As Former machine, we produce segmented compound screws, barrel and shafts on which the screws are arranged.
| Norm | Metarial | Heat Treatment | Hardness | Tensile Strength (N/mm2) | Hardness Depth (mm) |
| 1.7225 | 42CrMo4 | Nitriding | 560-630 HV5 | 800-950 | 0,2-0,3 |
| 1.8519 | 31CrMoV9 | Nitriding | 750-850 HV5 | 900-1100 | 0,3-0,4 |
| 1.8550 | 34CrAlNi7 | Gas Nitriding | 900-1050 HV5 | 850-1050 | 0,5-0,7 |
| 1.4122 | X35CrMo17 | Plasma Nitriding | 1000-1050 HV5 | 750-900 | 0,15-0,20 |
| Norm | Metarial | Heat Treatment | Hardness | Tensile Strength (N/mm2) | Hardness Depth (mm) |
| 1.2379 | X155CrVMo121 | Hardening | 58-62 HRc | — | Through Hardened |
| PM. Steels | Various | Hardening | 54-64 HRc | — | Through Hardened |
| Single Screw Production Parameters | Diameter Range (mm) | Max. Length (mm) |
| Nitriding Screws | 18- 250 | 9.000 |
| Bimetallic Screws | 18- 250 | 9.000 |
| Through Hardened Screws | 18- 100 | 1.500 |