Manufacturer of temperature-controlled rolls such as smoothing, cooling, heating and chill rolls for the plastics industry
Rolltec GmbH
Krefeld · Torun · Lubicz GórnyNew on Amplifa
About Rolltec
Rolltec GmbH, based in Krefeld, is a roll manufacturer that designs, calculates and produces temperature-controlled rolls for the plastics industry. The product range includes smoothing rolls, cooling rolls, heating rolls, chill rolls, laminator rolls, embossing and matt rolls as well as counter-bending rolls, which are manufactured at the plant in Torun (Poland) and used worldwide. The rolls are constructed with double walls and a degressive steel helical guide, offered in single- or dual-circuit designs, and statically and dynamically balanced. The outer shell is made of steel 42CrMo4 or S355J2G or copper; surfaces are hardened, hard or bright chrome-plated, nickel-plated, or mechanically or electrolytically matt-finished. In addition to patented in-house developments such as the Rollmatic coating, the company also reproduces and improves customer-specific designs and manufactures custom-made products. The design is carried out with respect to strength and thermodynamics using computer-aided analysis technology.
- Site
- Krefeld
- Processes
- Manufacture of smoothing rolls (hardened and non-hardened), double-wall with degressive, Surface hardening of smoothing rolls to 55 to 60 HRC, hardening depth 2–3 mm, Hard chrome plating with 120–130 µm chromium layer, Manufacture of cooling rolls (single- or dual-circuit, double-wall, statically and dynamically, Manufacture of heating rolls (single- or dual-circuit, double-wall, operating temperature up to 200, Manufacture of chill rolls (steel or copper, double-wall), Manufacture of laminator rolls (double-wall), Manufacture of embossing rolls (double-wall)
- Materials
- Steel 42CrMo4, Steel S355J2G, Copper, Chromium (hard chrome plating 120–130 µm), Nickel (nickel plating), Chromium (hard chrome plating), Rollmatic coating
- Certificates
- Final inspection of every roll with documentation, Dynamic balancing according to G = 6.3 DIN ISO 1940
- Industries
- Plastics industry, Film extrusion, Calender/roll manufacturing
- 01
Design and calculation
- 02
Machining/manufacturing of the roll
- 03
Hardening and coating
- 04
Grinding and polishing
- 05
Balancing
- 06
Final inspection with documentation
Materials & Processes
Steel 42CrMo4
Outer shell of hardened smoothing rolls, surface hardening to 55 to 60 HRC.
Steel S355J2G
Outer shell material of double-wall cooling, heating, laminator and embossing rolls.
Copper
Shell material for chill rolls.
Chromium (hard chrome plating)
Chromium layer of 120–130 µm for surface finishing and hardening.
Nickel (nickel plating)
Surface coating of cooling and other rolls.
Rollmatic coating
Patented post-hardening process for non-hardened calender rolls up to 58 HRC.
Locations
Krefeld
DEOffice/Administration (Germany Office)
Torun
PLProduction plant
- Part weight / size
- Up to 3500 kg, 6000 mm overall length
- Materials
- Steel 42CrMo4, S355J2G, copper
Lubicz Górny
PLWorkshop
Rolls
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Manufacture of smoothing rolls (hardened and non-hardened), double-wall with degressiveMachining | Runout and cylindricity < 5 µm · Rt up to 0.03–0.02 µm | 6000 mm overall length (4000 mm | 3500 kg | – | Steel 42CrMo4 |
| Surface hardening of smoothing rolls to 55 to 60 HRC, hardening depth 2–3 mmHeat treatment | – | – | – | – | Steel 42CrMo4 |
| Hard chrome plating with 120–130 µm chromium layerSurface | – | – | – | – | Steel, Copper |
| Manufacture of cooling rolls (single- or dual-circuit, double-wall, statically and dynamicallyMachining | Runout and cylindricity < 10m | 6000 mm overall length (4000 mm | 3500 kg | – | Steel S355J2G |
| Manufacture of heating rolls (single- or dual-circuit, double-wall, operating temperature up to 200Machining | Runout and cylindricity < 10m | 6000 mm overall length (4000 mm | 3500 kg | – | Steel S355J2G |
| Manufacture of chill rolls (steel or copper, double-wall)Machining | Runout and cylindricity < 10m | 6000 mm overall length (4000 mm | 3500 kg | – | Steel S355J2G, Copper |
| Manufacture of laminator rolls (double-wall)Machining | Runout and cylindricity < 10m | 6000 mm overall length (4000 mm | 3500 kg | – | Steel S355J2G |
| Manufacture of embossing rolls (double-wall)Machining | Runout and cylindricity < 10m | 6000 mm overall length (4000 mm | 3500 kg | – | Steel S355J2G |
| Manufacture of matt rolls / matt-finished rollsMachining | Runout and cylindricity < 10m | 6000 mm overall length (4000 mm | 3500 kg | – | Steel S355J2G |
| Manufacture of counter-bending rolls and hardened counter-bending smoothing rolls as well asMachining | – | – | – | – | Steel |
| Surface treatment: mechanical matt finishing, electrolytic matt finishing, hard chrome platingSurface | – | – | – | – | Steel S355J2G |
| Static and dynamic balancing of rolls according to G = 6.3 DIN ISO 1940Testing | – | – | – | – | Steel 42CrMo4, Steel S355J2G |
| Rollmatic coating – patented post-hardening process for existing non-hardenedHeat treatment | – | – | – | – | Steel |
| Design, calculation and development of temperature-controlled rolls (strength-based andEngineering | – | – | – | – | – |
| Final inspection of every completed roll (documentation, drawings)Testing | – | – | – | – | – |
| Reproduction or improvement of customer designs (rolls), custom-made productsEngineering | – | – | – | – | – |
Additional services
Quality
Every completed roll undergoes a final inspection in which compliance with all specified requirements is checked; documentation includes drawings and inspection records.
| Evidence | Torun |
|---|---|
| Final inspection of every roll with documentation | |
| Dynamic balancing according to G = 6.3 DIN ISO 1940 |
History
Over 39 years of experience in roll design and development