Manufacturer of extruded plastic profiles – from development and in-house toolmaking to finishing, all from a single source.
SLS Kunststoffverarbeitungs GmbH & Co. KG
DahnNew on Amplifa
The profile makers from Dahn
SLS Kunststoffverarbeitungs GmbH & Co. KG was founded in 1985 in Dahn (Rhineland-Palatinate) and produces extruded plastic profiles for industries such as window, door and gate construction, facade and dry construction, metal and control cabinet construction, electrical engineering, automotive and caravan construction, mechanical engineering, the packaging and furniture industries, and shading technology. The range of services covers profile development, CAD design with 3D-printed sample production (FDM, DLP), in-house toolmaking with over 2,000 manufactured extrusion tools, and (co-/post-co-)extrusion of solid and hollow profiles with unit weights of 20 to 5,000 g/m. Around 110 employees work in three-shift operation across approximately 3,100 m² of production space on more than 30 extrusion lines, with an annual throughput of around 7,000 tonnes of material. Engineering plastics such as PVC, W-PVC, ABS, PE, PP, PS, PLA, PETG, POM, PC-ABS, ASA, SB, PVC foam and WPC are processed, along with recycled granulate from an in-house recycling loop. Extrusion is complemented by a finishing department offering precision cutting, punching, drilling, milling, assembly and retail-ready packaging – including just-in-time kits. An internal machine-building department builds calibration tables, co-extruders and special systems itself and modernises existing systems through retrofitting.
- Site
- Dahn
- Processes
- Extrusion of solid and hollow profiles (standard and custom dimensions), Co-extrusion / post-co-extrusion (rigid-soft combinations, core of recycled granulate, foamed, 3D-print sample production and small series (FDM, DLP), Toolmaking: construction and maintenance of extrusion tools (milling, turning, drilling,, Design of extrusion tools in AutoCAD, Precision cutting (cutting accurate to tenths of a millimetre), Punching (reversible and irreversible, also inline punching on the extrusion line), Drilling and milling of profiles
- Materials
- PVC, W-PVC (soft PVC), ABS, PE, PP, PS, PLA, PETG
- Certificates
- ISO 9001, ISO 14001, Rewindo Premium Partner (plastic window recycling), Product certifications: CSTB/QB, LNE (FR), VDE (DE), KOMO (NL), ATG (BE), Product certifications (CSTB/QB, LNE, VDE, KOMO, ATG)
- Founded
- 1985
- Employees
- 110
- Industries
- Window, door and gate construction, Facade construction, Dry construction, Metal construction, Control cabinet construction, Electrical engineering
- 01
Profile development
- 02
Design (AutoCAD, 3D-printed samples)
- 03
Toolmaking (design, manufacturing, coating)
- 04
Material preparation/mixing plants
- 05
Extrusion and co-/post-co-extrusion
- 06
Finishing (cutting, punching, drilling, milling, roll forming)
- 07
Assembly and packaging
- 08
Just-in-time kits and logistics
- 09
Recycling of production residues
Location
Dahn
DEHeadquarters: production, toolmaking, finishing, machine building and administration
- Part weight / size
- 20–5,000 g/m profile weight
- Lot size
- Hundreds of metres (small series) to several kilometres (large series)
- Materials
- PVC, W-PVC, ABS, PE, PP, PS, PLA, PETG, POM, PC-ABS, ASA, WPC, SB, PVC foam, recycled granulate
- Over 30 extrusion lines (10–400 kg/h)
- Co-extruders (in-house built)
- Calibration tables
- Inline punching devices (in-house built)
- CNC milling centres (toolmaking)
- EDM machines
- Ultrasonic cleaning system
- 3D printers (FDM, DLP)
- Infeed and cutting machines (in-house built)
- Automated material mixing plants
Components
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Extrusion of solid and hollow profiles (standard and custom dimensions)Plastics | – | – | 20 g/m – 5,000 g/m | Hundreds of metres (small series) – several kilometres (large orders) | PVC, W-PVC, ABS, PE, PP, PS, PLA, PETG, POM, PC-ABS, ASA, SB, WPC, PVC foam |
| Co-extrusion / post-co-extrusion (rigid-soft combinations, core of recycled granulate, foamedPlastics | – | – | 20 g/m – 5,000 g/m | – | PVC, PE, ABS, PP, recycled granulate, virgin material, soft-elastic plastics |
| 3D-print sample production and small series (FDM, DLP)Additive | – | – | – | – | – |
| Toolmaking: construction and maintenance of extrusion tools (milling, turning, drilling,Machining | – | – | – | – | Steel |
| Design of extrusion tools in AutoCADEngineering | – | – | – | – | – |
| Precision cutting (cutting accurate to tenths of a millimetre)Plastics | tenths-of-a-millimetre range | – | – | – | – |
| Punching (reversible and irreversible, also inline punching on the extrusion line)Forming | – | – | – | – | – |
| Drilling and milling of profilesMachining | tenths-of-a-millimetre range | – | – | – | – |
| Assembly of complete assemblies/setsAssembly | – | – | – | – | – |
| Roll forming of metal and aluminium partsForming | – | – | – | – | Metal, Aluminium |
| Application of fabric tapesAssembly | – | – | – | – | – |
| Steel and glass fibre inserts in profilesPlastics | – | – | – | – | Steel, Glass fibre |
| electrically conductive, antistatic, high-heat-stable and flame-retardant profilesPlastics | – | – | – | – | – |
| Packaging and picking in customer packaging incl. labellingAssembly | – | – | – | – | – |
| In-house machine and plant construction (calibration tables, caterpillar pullers, profile cuttingEngineering | – | – | – | – | – |
| PLC programming, retrofitting of extrusion systems, IoT/Industry 4.0 automationEngineering | – | – | – | – | – |
| Hard-material coating of extrusion toolsSurface | – | – | – | – | Steel |
| Quality testing (heat ageing, shrinkage test, ball-drop test according to DIN EN 477, tensile testTesting | – | – | – | – | – |
| Profile development (standard profiles, custom designs, rigid and elastic profiles)Engineering | – | – | – | – | – |
12 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Extrusion lines (extruders) | – | >30 | Throughput 10–400 kg/h per line | – | Dahn |
| Calibration tables | – | – | – | – | Dahn |
| Co-extruders (side feeders, in-house built) | SLS (in-house built) | – | – | – | Dahn |
| CNC milling centres | – | – | – | – | Dahn (toolmaking) |
| EDM machines/EDM systems | – | – | – | – | Dahn (toolmaking) |
| 3D printers (FDM) | – | – | – | – | Dahn |
| 3D printers (DLP) | – | – | – | – | Dahn |
| Ultrasonic cleaning system (tool cleaning) | – | 1 | – | 2026 | Dahn |
| Inline punching devices | SLS (in-house built) | – | – | – | Dahn |
| Infeed machines, roller and cutting machines (finishing) | SLS (in-house built) | – | – | – | Dahn |
| Automated cutting and milling devices (finishing) | – | – | – | – | Dahn |
| Material mixing plants (automated, in-house built) | SLS (in-house built) | – | – | – | Dahn |
Additional services
Quality and certifications
Quality control is carried out every two hours alongside production by operators as well as independently by the QA department in accordance with DIN EN 477, 478, 479 and DIN EN 527 (ball-drop test, tensile test, heat ageing, shrinkage test, colour measurement, video measurement). Each profile is individually marked with material, production date and quality seal; measurement records are documented on a long-term basis.
| Evidence | Dahn |
|---|---|
| ISO 9001 | |
| ISO 14001 | |
| Product certifications (CSTB/QB, LNE, VDE, KOMO, ATG) |
Company history
- 1985
Foundation of SLS by Hans Schmidt, Thomas Leibrock and Manfred Streck in Dahn.
- 1993
Relocation from the Weibel shoe factory to the current site in the Dahn industrial park.
- 1998
First certification according to DIN EN ISO 9001.
- 2006
Expansion: enlargement of the toolmaking department and the finishing department.
- 2011
New production hall; production area grows to 3,100 m², capacity increase of almost 30%.
- 2014
Commissioning of a new chiller with combined heat and power for energy recovery.
- 2020
Premium partner cooperation with Rewindo for the recycling of plastic window profiles.
- 2023
New production hall exclusively for finishing.
- 2025
40th company anniversary; production of tool number 2,000; certification according to DIN ISO 9001:2015.
- 2026
Investment programme of approx. €1.0 million in production, toolmaking (two new EDM systems), finishing and warehouse logistics.