A feed roller on a packaging line wears through in a few weeks, a rubber stamping die loses its edge, and a steel guide leaves scratches on fabric. In light industry such small items stop entire production sections. Cast polyurethane solves this with a single material: it wears several times more slowly than rubber, does not damage the web as metal does, and returns to shape after every cycle. This article covers which light industry nodes are converted to polyurethane, how it compares with rubber, steel, and capron in numbers, and how to order a part to your drawing.
Where Polyurethane Works in Light Industry
Polyurethane replaces rubber and metal in all nodes where there is abrasion, pinch contact, and cyclic loading. These are feed and pinch rollers, drive shafts, stamping dies and cutting blades, forming bars, seals, damping bushings, and guides. The material holds abrasive equally well and maintains the accuracy of the contact surface, so it suits both rough operations and delicate work with fabric webs.
In textile and garment manufacturing, polyurethane rollers feed and press fabric without slipping or scratching. In the footwear industry, dies are cast from it for blanking components, forming lasts, and sole moulds, because the edge holds longer than rubber. In packaging and printing, polyurethane is installed on pinch and drive shafts where uniform pressure along the full length matters. In leather and pulp-and-paper production it withstands moisture and chemicals and leaves no marks on the material.
Free-casting technology allows a part in almost any geometry to be made: a solid roller, a coating on a metal core, or a profiled bar. Profile, grooves, or texture are set directly at the casting stage, so additional machining is not always required. The full range of typical products is in the polyurethane product catalogue.
Why Polyurethane Is Displacing Rubber and Metal
The key reason for substitution is straightforward: polyurethane combines wear resistance, elasticity, and chemical resistance that no single classical material offers alone. Rubber is elastic but wears quickly. Steel is strong but heavy, corrodes, and damages the web. Capron is hard but cracks under impact. Cast polyurethane closes all three weaknesses simultaneously.
On abrasion, polyurethane loses 38-39 mm³ per DIN 53516 while SBR rubber reaches 100-200 mm³ and NBR rubber 80-150 mm³. This means that under identical operating conditions a polyurethane part sustains several times longer intervals between replacements, and in practice the service life reaches several times that of standard rubber. For a line where a roller was changed monthly, this is a direct shift from emergency maintenance to planned maintenance.
Against metal, the gain is different. Polyurethane is 6-7 times lighter than steel, does not corrode in a damp shop, and does not leave scratches on fabric, leather, or paper. It absorbs vibration and impact, reducing load on bearings and seats. The operating range of -60 to +100 °C covers practically all light industry conditions, from cold storage to heated forming nodes.
Material Comparison for Light Industry Parts
A direct numerical comparison shows why engineers are switching to cast polyurethane. The table compiles reference properties from standard tests for materials that actually compete in these nodes.
| Material | Abrasion DIN 53516, mm³ | Operating t, °C | Hardness | Tensile strength, MPa | Rebound elasticity, % |
|---|---|---|---|---|---|
| Polyurethane TIMOL | 38-39 | -60…+100 | 85A-95A | 39-87 | 34-61 |
| SBR rubber | 100-200 | -40…+80 | 40A - 80A | 8-20 | 30-55 |
| NBR rubber | 80-150 | -30…+100 | 40A - 90A | 10-25 | 20-45 |
| Capron PA6/PA66 | 30-90 | -40…+100 | 75D - 85D | 60-85 | 5-15 |
| Structural steel | n/a | -40…+500 | 120-250 HB | 370-700 | n/a |
Polyurethane shows the lowest abrasion among elastomers and at the same time retains rebound elasticity of 34-61 %, which capron (only 5-15 %) does not have. This is why in impact stamping nodes a polyurethane die does not crack like a capron one, and outlasts rubber dies. Steel wins only on tensile strength but loses on weight, corrosion, and contact gentleness — so in light industry it is installed only where metal is unavoidable.
Engineer’s tip: do not chase maximum hardness. For feed and pinch rollers in contact with fabric or paper, use 50-70 Shore A — otherwise a stiff shaft slips and creases the web. Save harder grades closer to 70 Shore D for blanking dies; abrasive guides are made in the upper Shore A zone, 80-95 Shore A, where resilience holds wear. And remember: for lined rollers, the service life is not determined by the polyurethane itself but by the quality of preparation and degreasing of the metal core before bonding.
Installation, Maintenance, and Replacement Economics
In most nodes a polyurethane part is installed in place of the rubber or metal one without modifying the equipment. Solid rollers and bushings are seated on shafts with standard fits; the lined layer works directly on the original axle; dies are fitted into existing tooling. This matters in light industry, where retooling a line costs more than the part itself.
Maintenance consists of cleaning adhered build-up and visual wear inspection. Polyurethane does not absorb moisture, does not corrode, and is unaffected by mould and UV in normal shop conditions. When the working layer of a lined roller eventually wears, the metal core is not discarded: the old polyurethane is stripped, the surface is prepared for bonding, and a new layer is cast. The metal continues in service and the costs reduce to the cost of polymer and labour.
This is the basis of the replacement economics. A single polyurethane part costs more than a single rubber one, but lasts several times longer and does not bring line downtime with it. Calculating the cost not of one part but of one year of node operation including downtime and installation, polyurethane almost always works out less expensive. Full details of lining and node restoration services are in the factory services section.
How to Order Polyurethane Parts to Size
To order, supply a drawing, sketch, or worn sample of the part with dimensions and fits. Describe the node operating conditions: load type, speed, presence of abrasive or chemicals, temperature, and the nature of contact with the material being processed. From this data the technologists select the formulation and hardness and calculate the geometry.
Free-casting technology does not require expensive tooling, so the factory produces both individual parts to a drawing and production batches. This is convenient when a worn non-standard-size node needs quick replacement or when a pilot batch needs to be trialled before a production run. Technical material on polyurethane properties and selection is in the reference information section.
For a calculation to your drawing and consultation, contact us via TIMOL factory contacts. Engineers will help select the hardness and formulation, assess service life in your conditions, and organise manufacturing for the specific light industry node.