Manufacturing and regeneration of plasticizing units – screws, barrels, non-return valves and nozzles for plastics processing machines
Groche Technik GmbH
Kalletal (Langenholzhausen)New on Amplifa
About Groche Technik
Groche Technik GmbH is a family business founded in 1970 and based in Kalletal-Langenholzhausen (district of Lippe) that manufactures plasticizing units for plastics processing machines. The product portfolio comprises screws, barrels, non-return valves, nozzles and barrel caps, feed housings, dynamic mixers as well as special nozzles, plus the GTM unit for micro injection moulding and peripherals such as gravimetric dosing systems and conveying technology. Production is carried out by machining with component sizes from Ø 12 to 200 mm and lengths up to 5000 mm; materials include steel of choice, nitriding steel and bimetal. In addition to new production, the company offers screw and barrel regeneration with PTA welding, grinding, polishing, nitriding and leak testing, as well as surface finishing through HVOF coating and PVD hard material coatings (CrN, CrN Mod., TiN). Design and engineering of individual screw geometries, measurement service and assembly round out the range of services. The sales network covers Germany and neighbouring European countries; the company is certified to ISO 9001 and ISO 14001.
- Site
- Kalletal
- Processes
- Manufacturing of barrels (thermoplastic, extruder, thermoset, elastomer, venting,, Manufacturing of screws (including 3-zone, barrier, venting, thermoset, LSR, PVC, metering,, HVOF finishing for screws (coating, layer thickness up to 0.25 mm), PVD coating (CrN, CrN Mod., TiN) for machine parts of plastics processing machines, Manufacturing of non-return valves (including 3-part, VKS, 2-flap, ball, angled-ball, multi-ball,, Manufacturing of active non-return valves (Patent 2883677) from Ø 40 mm, Manufacturing of nozzles, barrel caps, nozzle adapters, nozzle tips, cap nozzles, nozzles with pin,, Manufacturing of special nozzles: GSM mixing nozzle, screen pack nozzle, spring-actuated needle
- Materials
- Bimetal, Nitriding steel, Steel of choice, Carbide, CrN, CrN Mod., TiN
- Certificates
- DIN ISO 9001:2015, ISO 14001:2015, ISO 9001, ISO 14001
- Founded
- 1970
- Industries
- Plastics processing industry, Injection moulding, Extrusion, Micro injection moulding, Rubber/elastomer processing (LSR, elastomers), Thermoset processing
- 01
Design and engineering of individual geometries
- 02
Machining (turning, drilling, honing)
- 03
Welding/joining (PTA welding, partial renewal)
- 04
Heat treatment (nitriding)
- 05
Surface technology (HVOF, PVD)
- 06
Grinding and polishing
- 07
Quality inspection with measurement report
- 08
Measurement service, assembly and sales
Materials & Processes
Bimetal
For thermoplastic, thermoset and venting barrels; wear- and corrosion-resistant bore.
Nitriding steel
For extruder and elastomer barrels as well as screws with increased surface hardness.
Steel of choice
Base material for screws, non-return valves, nozzles and feed housings depending on the application.
Carbide
HVOF coating up to 0.25 mm layer thickness refines screw surfaces for extreme stress.
CrN
PVD hard material coating for extended service life and avoidance of plastic adhesion.
CrN Mod.
Modified PVD coating for demanding plastics processing.
TiN
PVD hard material coating for hard, low-friction surfaces on machine parts.
Locations
Kalletal (Langenholzhausen)
DEProduction, sales, administration (company headquarters)
- Part weight / size
- Ø 12–200 mm, length up to 5000 mm
- Materials
- Bimetal, nitriding steel, steel of choice
- Machining
- PTA welding
- Honing machine
- Grinding technology
- HVOF system
- PVD coating
- Measuring and testing technology
Components
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Manufacturing of barrels (thermoplastic, extruder, thermoset, elastomer, venting,Machining | – | 5000 mm × Ø 200 mm | – | – | Bimetal, Nitriding steel |
| Manufacturing of screws (including 3-zone, barrier, venting, thermoset, LSR, PVC, metering,Machining | – | 5000 mm × Ø 200 mm | – | – | Steel of choice, Bimetal, Nitriding steel |
| HVOF finishing for screws (coating, layer thickness up to 0.25 mm)Surface | – | – | – | – | Carbide |
| PVD coating (CrN, CrN Mod., TiN) for machine parts of plastics processing machinesSurface | – | – | – | – | Steel |
| Manufacturing of non-return valves (including 3-part, VKS, 2-flap, ball, angled-ball, multi-ball,Machining | – | – | – | – | Steel of choice |
| Manufacturing of active non-return valves (Patent 2883677) from Ø 40 mmMachining | – | Ø 40 mm (from) | – | – | Steel of choice |
| Manufacturing of nozzles, barrel caps, nozzle adapters, nozzle tips, cap nozzles, nozzles with pin,Machining | – | – | – | – | Steel of choice |
| Manufacturing of special nozzles: GSM mixing nozzle, screen pack nozzle, spring-actuated needleMachining | – | – | – | – | Steel of choice |
| Manufacturing of feed housings with feed pockets and feed groovesMachining | – | – | – | – | Steel of choice |
| Screw regeneration (cleaning, crack testing, pre-grinding, PTA welding, straightening, flank andHeat treatment | – | – | – | – | Steel, Bimetal |
| Barrel repair by partial renewal (bimetal tube screwed/welded, bore honed)Joining | – | – | – | – | Bimetal |
| Barrel repair by sleeving in the discharge area (turned out to 5 L/D depth, shrink-fittedJoining | – | – | – | – | Bimetal |
| Nitriding (as needed during screw regeneration)Heat treatment | – | – | – | – | Steel |
| Micro injection moulding GTM unit (volume reduction approx. 30%, up to 50% through geometryPlastics | – | – | – | – | Thermoplastics |
| Retrofitting of screws with dynamic mixers (helix screen mixer,Machining | – | – | – | – | Steel of choice |
| Sales of peripherals (LIAD gravimetric dosing systems, Simatec conveying technology, dryers,Assembly | – | – | – | – | – |
Additional services
Quality
Production is carried out in accordance with DIN ISO 9001 with final inspection and measurement report of the machined parameters; every screw regeneration undergoes runout and leak testing. Since 2022, the company has additionally been certified to ISO 14001.
| Evidence | Kalletal |
|---|---|
| ISO 9001 | |
| ISO 14001 |
History
- 1970
Founded as a contract turning shop for injection moulding machine manufacturers
- 1975
Restructuring into a specialist company for plasticizing units
- 1985
Expansion of the sales network to neighbouring European countries
- 1992
Relocation to the newly built company headquarters in Langenholzhausen
- 1996
Acquisition of shares by Armin Groche
- 2004
Company founder Rolf Groche hands over management to his son Armin
- 2009
Certification to ISO 9001
- 2016
Expansion of production and warehouse area to 5,000 m²
- 2020
50 years of Groche quality
- 2022
Certification to ISO 14001