Theysohn works reliably.
Theysohn stands for a business partner that every customer and entrepreneur can trust. Competence and solutions for plastics machines, plastics processors as well as for the chemical and food industry at home and abroad are our passion and have been for several decades.
For more than sixty years, the name THEYSOHN has stood for high-performance products for plastics and rubber processing. THEYSOHN products are shipped from the Salzgitter factory to many countries around the world. As essential components, they are used in machines of many renowned manufacturers and processors.
Developments were geared towards wear-protected plasticising units at an early stage. Optimum solutions are offered with wear-protected designs of barrels, housings and screws. The production of well over forty thousand screws and barrels in a wide variety of sizes and designs has allowed extensive development and production know-how to mature.
THEYSOHN - a partner with expertise. For plastics machinery manufacturers, plastics processors, as well as for the chemical and food industries at home and abroad
The benchmark is quality
The quality of THEYSOHN Salzgitter products is subject to internal quality standards and the DIN ISO 9001 quality management system: 2008. The production steps are continuously monitored through self-monitoring by the employees. Before leaving the factory, all products undergo a final inspection. This ensures quality of the highest level. Quality products from THEYSOHN make plastics processing safer.
Theysohn Salzgitter supplies the following products:
- Screws for extruders and injection moulding machines
- Parallel and conical twin-screws and barrels
- Single screws and barrels
- Bimetallic barrels for single and twin-screws
- Barrel sections and screw shafts for compounders
- Regeneration and repairs of screws, barrels and barrel sections
- Precision parts for mechanical engineering
- Subcontracting (parallel & conical): Deep drilling, honing, turning, grinding, welding of long lengths
Replacement screws and barrels (single and twin) from Theysohn Extrusionstechnik increase the quality and output of every extruder. Theysohn has a great deal of experience in the development of plasticising units through constructing its own extruders, which is also available for the conversion of commercially available extruder models (cylindrical or conical).
Screws are “custom designed” and manufactured by Theysohn in a variety of types to meet the individual requirements of customers. The most complicated geometries can be realised directly and quickly with the CNC programming integrated into the production process. Computer-aided production preparation ensures high flexibility.
THEYSOHN's own special machines have been developed for deep drilling and for honing in conical barrel bores. The machining techniques, combined with the appropriate materials and the experience of our qualified team, ensure the highest dimensional accuracy. Long-term nitriding to great depth gives barrels good wear resistance. Barrels with exchangeable bimetal liners are offered for increased requirements.
- Single-screw barrels: Long-term gas-nitrided, bimetal T5000 and T8000, HIP, Hastelloy
- Twin-screw barrels: Long-term gas-nitrided, bimetal T5000 and T8000
In many extrusion applications, long-term nitrided twin-screws are the standard design. If the requirements are high, the flights are coated. Molybdenum coatings from THEYSOHN have proven to have particularly good sliding and emergency running properties. In other applications, plasma-welded wear protection coatings made of stellite, Ni/C-based alloys and specially developed and modified tungsten carbide alloys are used
All barrels are made of high-quality nitrided steel. A very high uniform depth of hardness and ground or honed holes guarantee a long service life.
THEYSOHN has developed special alloys to line all types of twin-screw barrels with so-called bimetallic liners, thus enabling maximum wear and corrosion resistance.
All bimetallic alloys are optimally matched to THEYSOHN's own twin-screw coating systems and guarantee optimum service life and process results. The THEYSOHN system can be used for all process units available on the market and sets new standards in terms of price and performance.
- T5000 modified iron-chromium-nickel base for use with THEYSOHN twin-screws with plasma sprayed molybdenum coatings or alternatively two stage long term gas nitrided.
- T8000 modified WC nickel base for use with THEYSOHN twin-screws with plasma welded hard bar coatings
- Wear sleeves: Long-term gas-nitrided, FSR vdh, HIP, powder metallurgy materials
The THEYSOHN repair system allows all used and worn barrels to be reconditioned by means of a special spindle process, guaranteeing compliance with the technical conditions in order to subsequently fit high-quality bimetallic liners in a professional manner. The THEYSOHN system guarantees the possibility of replacing the bimetallic liners at any time, offering short delivery times with degressive pricing.
Barrel sections and Screw Shafts
THEYSOHN Salzgitter supplies barrel sections and screw shafts for compounders. In the standard version, the barrel sections are made of nitrided steel and are nitrided to a great depth. Casings with replaceable wear sleeves made of through-hardened special steel offer great resistance to abrasive wear that occurs when processing plastics with additives. In case of corrosive wear behaviour, sleeves are made of through-hardened, rust- and acid-resistant steels.
In the case of extreme wear stresses, housings are manufactured in an HIPed design, i.e. using powder metallurgy materials.
Screw shafts made of quenched and tempered steels ensure perfect transmission of the required torques.
Barrel sections: Long-term gas-nitrided, duplex
The THEYSOHN system can be used for all process units available on the market and sets new standards in terms of price and performance.
The THEYSOHN repair system allows all used and worn barrels to be reconditioned by means of a special spindle process, guaranteeing compliance with the technical conditions in order to subsequently fit high-quality bimetallic liners in a professional manner.
The THEYSOHN system guarantees the possibility of replacing the bimetallic liners at any time, offering short delivery times with degressive pricing.
By arrangement, our customers can send screws and barrels to the Salzgitter factory to have them reconditioned or to optimise geometries.