Manufacture and regeneration of bimetallic barrels, screws and plasticizing units for the plastics industry.
Bernex Bimetall AG
Trimbach (Switzerland) · Modrice (Czech Republic) · Camignone di Passirano (Italy) · Sriracha, Chonburi (Thailand)New on Amplifa
About Bernex
Bernex Bimetall AG, headquartered in Trimbach (Switzerland), has been active in the plastics industry for over 50 years and, as part of the Bernex Group, is one of the leading European manufacturers of bimetallic barrels, screws and plasticizing units. The product portfolio includes simple screws for injection moulding and extrusion, co-rotating and counter-rotating twin screws, multi-part screws, mixing and shearing elements, screw tips, non-return valves as well as bimetallic barrels with wear-protected inner layers. In production, steel tubes are centrifugally lined with powder-metal alloys (A110, AC333, C242, ACW800), melted in a furnace, evenly distributed by rotation, honed and mechanically finished. In addition, screws are armoured with PTA welding machines (BC1/BC6/BC12, BN56, BF60, BNW 830), nitrided or given PVD thin-film coatings (TiN, CrN, multilayers). Another mainstay is the complete regeneration of worn screws and barrels, including wear analysis, build-up welding, grinding and milling. With production sites in the Czech Republic (Bernex Bimetall s.r.o., Modrice) and Italy (OMG S.p.A., Brescia) as well as a presence in Thailand, the Group primarily supplies European plastics processors.
- Site
- Trimbach
- Processes
- Manufacture of bimetallic barrels (centrifugal casting / centrifugal lining with bimetallic layers), Honing of barrels (to internal dimension), Screw manufacturing (injection moulding, extrusion, other), Twin-screw manufacturing (co-rotating and counter-rotating), Screw regeneration (measurement, wear analysis, rebuild), PTA welding (deposition of protective layers with PTA welding machines), Nitriding of screws, PVD coating (TiN, CrN and multilayer-based)
- Materials
- A110 bimetallic layer (iron-based alloy), AC333 bimetallic layer (iron-based alloy Fe/Cr), C242 bimetallic layer (nickel-based alloy), ACW800 bimetallic layer (tungsten carbide-based), BC1 / BC6 / BC12 (cobalt-based alloy, C, Cr, W), BN56 (nickel-based alloy, C, Si, Cr, B, Fe), BF60 (iron-based alloy, Cr, V), BNW 830 (nickel-based + tungsten carbide WC/W2C)
- Certificates
- ISO 9001:2015, ISO 14001:2015
- Industries
- Plastics industry (injection moulding, extrusion)
- 01
Steel tube or screw blank
- 02
Centrifugal casting of the bimetallic layer / PTA build-up welding of the
- 03
Heat treatment (nitriding)
- 04
Honing or pre-grinding
- 05
CNC milling and grinding (flanges, bores, flights)
- 06
PVD coating (TiN/CrN) optional
- 07
Final inspection with identification and serial number
Materials and Coatings
A110 bimetallic layer (iron-based)
Standard layer against abrasion for plastics with filler content up to 10 %, hardness 58–65 HRC.
AC333 bimetallic layer (iron-based Fe/Cr)
Multifunctional layer against abrasion and corrosion, suitable for glass fibre contents up to approx. 30 %, hardness 64–69 HRC.
C242 bimetallic layer (nickel-based)
Low-iron nickel-based layer for corrosive plastics such as PVC, PUR and fluoropolymers, hardness 48–56 HRC.
ACW800 bimetallic layer (tungsten carbide-based)
Protection against abrasion and corrosion for highly filled plastics through tungsten carbides in a nickel matrix, hardness 58–66 HRC.
Flight armouring, cobalt-based (C, Cr, W)
Cobalt-based screw armouring with hardnesses of 38–57 HRC depending on type.
Flight armouring, nickel-based (C, Si, Cr, B, Fe)
Nickel-based armouring alloy for screw flights with hardness 52–56 HRC.
Flight armouring, iron-based (Cr, V)
Iron-based armouring alloy with hardness 51–58 HRC for screw flights.
Flight armouring, nickel-based + tungsten carbide (WC/W2C)
Nickel-based armouring with tungsten carbides for maximum wear protection, hardness 56–60 HRC.
Tool steel (through-hardened)
For through-hardened screws with diameters of 18–80 mm and lengths up to 2'000 mm.
Nitriding steel
Material for nitrided screws and barrels in standard versions.
PVD thin-film coating
TiN, CrN and multilayer coatings for additional protection of the screw geometry.
Locations
Trimbach
CHHeadquarters, sales and manufacturing
- Materials
- Bimetallic alloys, tool steel, nitriding steel
- PTA welding machines
- High-temperature, gas or induction furnace
- Centrifugal casting machine
- Honing machine
Modrice
CZProduction plant (Bernex Bimetall s.r.o.), certificate head office
- Materials
- Bimetallic alloys, tool steel, nitriding steel
- PTA welding machines
Camignone di Passirano (Brescia)
ITProduction site (OMG S.p.A.)
Sriracha, Chonburi
THSite (BBTH Co., Ltd)
Components
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Manufacture of bimetallic barrels (centrifugal casting / centrifugal lining with bimetallic layers)Casting | – | Length: 3000 mm × Inner diameter: 30 - 200 mm | – | – | Steel tube, Powder metal (bimetallic alloys A110, AC333, C242) |
| Honing of barrels (to internal dimension)Machining | – | – | – | – | Bimetallic barrels |
| Screw manufacturing (injection moulding, extrusion, other)Machining | – | max 9'000 mm × Diameter: 18 - 600 mm | – | – | Tool steel (through-hardened), Nitriding steel |
| Twin-screw manufacturing (co-rotating and counter-rotating)Machining | – | 6000 mm × Outer diameter: 40-200 mm | – | – | Tool steel, Nitriding steel |
| Screw regeneration (measurement, wear analysis, rebuild)Joining | – | – | – | – | Steel (except through-hardened screws) |
| PTA welding (deposition of protective layers with PTA welding machines)Joining | – | – | – | – | Flight armourings BC1, BC6, BC12 (cobalt-based), BN56 (nickel-based), BF60 (iron-based), BNW 830 (nickel-based + tungsten carbide) |
| Nitriding of screwsHeat treatment | – | – | – | – | Steel, Nitriding steel |
| PVD coating (TiN, CrN and multilayer-based)Surface | – | – | – | – | Screws |
| Thin-film coating of screwsSurface | – | – | – | – | Screws |
| Manufacture of multi-part screws, mixing and shearing elements, screw tips, non-return valvesMachining | – | – | – | – | Tool steel, Nitriding steel |
| Tool steel screws (through-hardened)Machining | – | max 2'000 mm × Diameter: 18 - 80 mm | – | – | Tool steel |
4 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| PTA welding machine | – | – | – | – | Trimbach, Switzerland |
| High-temperature, gas or induction furnace | – | – | – | – | – |
| Centrifugal casting machine (rotation for centrifugal lining with bimetal) | – | – | – | – | – |
| Honing machine (barrels to internal dimension) | – | – | – | – | – |
Additional services
Quality
The Bernex Group is committed to delivering parts that conform to drawings with optimal wear and corrosion resistance. Every bimetallic barrel undergoes a final inspection and receives a Bernex identification and serial number.
| Evidence | Modrice | Trimbach |
|---|---|---|
| ISO 9001:2015 | ||
| ISO 14001:2015 |
History
Over 50 years of international presence in the plastics industry; today the Bernex Group with headquarters in Switzerland and production sites in the Czech Republic and Italy
- 2021
Issuance of the SQS certificates ISO 9001:2015 and ISO 14001:2015 (Reg. no. H42891, valid until 14.09.2024) for bimetallic barrels and screws
- 2023
Completion of the website with language versions DE, EN, IT