“Former” Screws That Shape Plastıcs

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


Integrated Barrier screws

The Barrier design screws which separate molten plastics from solid plastics and Grooved fed barrels offer the following advantages;

  • Stable and high output, compared to the classical screws,
  • Higher melt quality and lower melt temperature, Better dispersive mixing,
  • Better results for processing of regenerated or grinded materials

Dynamic Mixers

With the Application of Dispersive and Distributive Mixers;

  • Effective mixing and distribution of colour master-batches, additives, stabilizers and etc.
  • Preventing agglomerations and improving the melt quality
  • Better appearance and mechanical properties of the produced material
  • Improvement of the product quality with process specific mixers for extrusion and injection molding can be obtained.

Segmented Compound Screws

As Former machine, we produce segmented compound screws, barrel and shafts on which the screws are arranged.

Screw Materials


NormMetarialHeat TreatmentHardnessTensile Strength (N/mm2)Hardness Depth (mm)
1.722542CrMo4Nitriding560-630 HV5800-9500,2-0,3
1.851931CrMoV9Nitriding750-850 HV5900-11000,3-0,4
1.855034CrAlNi7Gas Nitriding900-1050 HV5850-10500,5-0,7
1.4122X35CrMo17Plasma Nitriding1000-1050 HV5750-9000,15-0,20

Through Hardened

NormMetarialHeat TreatmentHardnessTensile Strength (N/mm2)Hardness Depth (mm)
1.2379X155CrVMo121Hardening58-62 HRcThrough Hardened
PM. SteelsVariousHardening54-64 HRcThrough 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