A conveyor roller that abrades against an abrasive stream in a few weeks stops the whole line, because one worn assembly wrecks the transport schedule. A rubber tyre crumbles and leaves a trail, a metal one rattles and transmits vibration to the frame. A polyurethane roller combines quiet running with a service life 2-5 times higher than rubber, and works in contact with oil and water. Below I break down exactly where polyurethane rollers stand, how they beat rubber and steel, and how to order manufacturing to your own size.
Where polyurethane rollers stand in a line
Polyurethane rollers work where wear resistance, quiet running, and gentle contact with the material all matter at once. They are fitted into conveyor systems, forming and support assemblies, guides of transport lines, and pressure mechanisms of packaging and printing equipment. In each of these assemblies the roller either guides the material along a set path, or presses it, or supports the belt under load.
The type of roller defines its task. Guide rollers set the path of the belt or blank, transport rollers carry the main flow load, forming rollers shape and press the material, support rollers hold the weight of the structure. For each task the polyurethane hardness and geometry are matched: tyre width, diameter, presence of grooves or flanges.
A roller is made solid or as a polyurethane layer on a metal shaft or hub with bearing seats. The second option lets you restore the assembly by re-lining without changing the expensive metal core. That is exactly why polyurethane rollers pay off on intensively worked lines, where replacements happen often.
The thickness of the polyurethane layer is a compromise between service life and stiffness. A thicker layer lasts longer on abrasion and absorbs impacts better, but deforms more under point loading. A thinner layer holds geometry more precisely, but wears down to the metal faster. The optimal thickness is determined by the engineer for the specific load and line speed, so the roller does not hammer at working revolutions and has a reserve of wear before the next lining.
How polyurethane beats rubber, steel, and polyethylene
TIMOL polyurethane delivers wear resistance 2-5 times higher than rubber while keeping resilience in the range from -60 to +100 °C. This means the roller lasts many times longer than a rubber one on the same abrasive stream and loses none of its properties either in the cold or in a hot shop. Rubber stiffens in the cold, and ages quickly under the action of oils and ozone.
Compared with steel, a polyurethane roller is lighter, does not corrode, and absorbs impacts instead of transmitting them to the frame and bearings. A steel roller is stronger in tension, but rattles, breaks up the contact surface of the material, and accelerates support wear through vibration. For lines where the surface quality of the product matters, metal is often unacceptable altogether.
Ultra-high-molecular-weight polyethylene (UHMW-PE) has low friction and good abrasion resistance, but it is almost inelastic (rebound 5-10 %) and deforms under prolonged load. Where a roller has to absorb impacts and hold its shape under pressure, polyurethane wins thanks to its combination of resilience and wear resistance.
Noise and vibration deserve a separate mention. A roller is an assembly that rotates constantly, so any runout or stiffness of the material turns into hum and load on the bearings. The polyurethane layer works as a damper: it absorbs small impacts from belt joints or irregularities in the blank and does not transmit them to the shaft. On loud lines, replacing metal or rigid plastic rollers with polyurethane ones noticeably lowers the noise level and extends the life of the supports, because the bearings stop working under constant vibration.
Engineer’s tip: for rollers that contact finished products (paper, film, polished metal), take a softer polyurethane, which distributes pressure evenly and leaves no marks. For abrasive streams of ore or grain, choose harder yet resilient grades at 80-95 Shore A. If the roller rotates at high speed, check the balance and the seat of the tyre separately: runout at speed quickly destroys the bearings.
Comparison table of roller characteristics
The values below are taken from standard engineering references (DIN 53516, ISO 4649, Matweb) and show the difference in roller service life under the same conditions.
| Parameter | Polyurethane (TIMOL) | SBR rubber | UHMW-PE | Structural steel |
|---|---|---|---|---|
| Abrasion (DIN 53516), mm³ | 38-39 | 100-200 | 15-30 | no data |
| Operating temperature, °C | -60…+100 | -40…+80 | -200…+80 | -40…+500 |
| Hardness | 85A-95A | 40A - 80A | 60D - 70D | 120-250 HB |
| Tensile strength, MPa | 39-87 | 8-20 | 17-45 | 370-700 |
| Rebound resilience, % | 34-61 | 30-55 | 5-10 | no data |
Polyurethane and UHMW-PE are close in abrasion (38-39 against 15-30 mm³), but rebound resilience decides it: 34-61 % for polyurethane against 5-10 % for polyethylene. It is precisely this resilience that lets a polyurethane roller absorb impacts, hold shape under load, and work where rigid polyethylene flows. Against SBR rubber, polyurethane wins at once on abrasion (3-5 times less) and on tensile strength, so roller service life grows several times over.
How rollers are made to the customer’s size
Making a roller starts with a drawing or a sample: the engineer defines the diameter, width, and type of fit, and selects the polyurethane hardness to match the character of the load. To line a metal shaft, the surface is cleaned, degreased, sandblasted, and coated with an adhesion layer, on which the strength of the bond between polyurethane and metal depends.
The polyurethane layer is cast by open casting into a mould of the required profile. The method lets grooves, flanges, and channels be formed directly on the roller, and produces tyres of various widths without high pressure. After polymerisation the roller is machined to exact geometry and balance, to ensure smooth running without runout at working speed.
Special attention goes to the bearing assembly. The roller is made for a specific bearing type and fit, and the polyurethane layer is cast so as not to block the lubrication channels or disturb heat removal. Overheating of the support is a frequent cause of roller failure on fast lines, so the geometry is agreed not only by outer diameter but also by the internal assembly.
Ready solutions and standard sizes are gathered in the polyurethane product catalog, and more about the material and the casting technology can be read in the reference information section. If the roller you need is not in stock, it will be made for your task.
How to order polyurethane rollers
To order, provide a drawing or a worn roller as a sample, state the diameter, width, and the type and size of the axle or bearing fit, and describe the working conditions: load, line speed, the type of material that rolls, temperature, and presence of oils. The engineer takes the measurements, selects the polyurethane hardness, and calculates the geometry for your assembly.
Rollers are made one at a time and in runs, and worn assemblies with an intact metal core are restored by re-lining. For a quote on lead times and cost, reach out through the TIMOL plant contacts: our specialists will select the material, calculate the tooling, and make rollers exactly to fit your line.