Custom Polyurethane Scrapers and Blades

Scrapers, blades and wipers in polyurethane

To clean a conveyor or scrape a surface, polyurethane gives controlled contact, good abrasion resistance and the flexibility you need. Depending on the project, Soremag casts scrapers, blades, wipers and flexible lips in the shape, the thickness and the hardness that suit the job.

Blades that clean without marking

A worn blade lets material through: carryback under the conveyor, manual cleanup that keeps adding up, a belt that eventually gets marked. Cast polyurethane holds its edge longer than rubber and pushes that moment back. The trade-off is still there: a scraper has to stay in contact firmly enough to lift the material off, but gently enough not to damage the surface. Every blade is designed around the equipment and the material to be removed.

Types of scrapers and blades

An overview of the scraping and cleaning parts we cast in polyurethane. The list is not exhaustive, and the shapes are designed project by project.

Bande de raclage en polyuréthane jaune enroulée, coulée en longueur continue à couper à la dimension — Bande de raclage en polyuréthane sur mesure, coulée en longueur continueScraper strip — épaisseur, largeur et dureté selon votre modèle

Racleur de courroie en polyuréthane orange à profil biseauté avec base à rainure de montage — sur mesure selon votre modèle — Racleur de courroie en polyuréthane sur mesure, profil biseautéBelt scraper — base à rainure, profil et dureté selon votre modèle

Canoe liner en polyuréthane bleu adhérisé sur support d'acier galvanisé avec fentes de fixation — Canoe liner en polyuréthane sur mesure, sur support d'acierCanoe liner — reproduit selon votre modèle, avec fentes de fixation

Deux racleurs en polyuréthane rouge coulé à chaud, arête imprégnée de billes de céramique (ceramic bead bar) — Racleurs à billes de céramique sur mesure, arête imprégnéeCeramic bead bar — dimensions et profil selon votre modèle

Racleur de convoyeur en polyuréthane bleu à arête de raclage vive, monté sur barre d'acier inoxydable avec trous de fixation — Racleur de convoyeur en polyuréthane sur mesure, sur barre porte-lameBelt scraper — coulé selon votre modèle, support récupérable

Ensemble racleur de convoyeur en polyuréthane bleu assemblé sur cadre d'acier galvanisé avec pieds de montage — Ensemble racleur en polyuréthane sur mesure, prêt à installerBelt scraper assembly — cadre, pieds et lame reproduits selon votre modèle

Conveyor scrapers (belt scrapers)

Blades that lift material stuck to the belt, as a primary or secondary cleaner. Polyurethane holds its edge and, depending on the application, can last a long time without marking the belt.

Ceramic bead scrapers (ceramic bead bar / bead blade)

Blades whose working edge is impregnated with ceramic beads over roughly 1 to 2 in.: the polyurethane holds the beads and absorbs the impacts, the ceramic resists sliding abrasion. Useful for lifting off the most stubborn products, even in frozen conditions.

Cleaning blades (cleaning blades)

Scraper blades for rollers, cylinders or flat surfaces. The flexibility of polyurethane gives even contact along the blade, set to the pressure you want.

Scrapers (scrapers)

Firmer scrapers for breaking loose stubborn deposits or build-up. The hardness is chosen according to the material to be removed and the surface to be protected.

Flexible lips (flexible lips / wipers)

Soft lips and wipers that follow a surface to hold back or divert a product, a liquid or dust. The flexibility of polyurethane helps keep the contact despite surface irregularities.

Belt scrapers and wipers (belt wipers)

Wipers installed along or under the belt to clear moisture, dust or fines. Profiles and durometers set according to the speed and the material being conveyed.

Scraper strips (scraper strips)

Continuous polyurethane strips used as the scraping element on a backing or a slide rail. Cast in various lengths and thicknesses, to be cut to size.

Steel-backed blades (steel-backed blades)

A polyurethane blade cast or bolted onto a steel plate, with mounting holes (sometimes countersunk) for direct mounting on the equipment. See below.

Design parameters

An effective blade is a balance between several parameters. Depending on the project, we go through them with you to guide the choice of formulation and geometry.

Hardness

From softest to firmest (Shore A): a starting point to adjust to the contact and the material to be removed.

Thickness

Affects the stiffness and the deflection of the blade; chosen according to the load and the length.

Contact angle

The angle of the blade against the surface drives the scraping action and the wear.

Contact pressure

Enough to lift the material off, without loading the surface or the blade more than necessary.

Speed

Line speed can affect heat build-up, wear and the profile selected.

Temperature

Depending on the environment (hot, cold, frozen), the polyurethane chemistry is chosen accordingly.

Material to be removed

Sticky, abrasive, fine or coarse material: each case drives the hardness and the geometry.

Water or oil present

Depending on the moisture and the oils involved, we favor a more resistant chemistry (ester or ether, depending on the project).

Mounting

How it mounts on the equipment: bolting, steel backing, mounting holes.

A blade that is too hard can prematurely wear the surface it touches; a blade that is too soft can lose its scraping effectiveness. The right trade-off depends on the project and is often confirmed in service.

Steel-backed scrapers

On many installations, the polyurethane blade is paired with a steel part that provides the stiffness and the mounting.

Polyuréthane + acier

A polyurethane lip, a reusable backing

Depending on the project, the polyurethane is

cast or bolted onto a steel plate

, or overmolded onto

inserts

, with

mounting holes

(sometimes countersunk) for a flush mount on the equipment.

The steel backing gives the rigidity and serves as the mounting interface. In many cases, it can be

reclaimed and recovered

when the polyurethane lip is worn, instead of being replaced entirely.

Learn more about overmolding on metal →

Racleur en polyuréthane sur support d'acier installé contre une courroie de convoyeur

Where our scrapers work

Three families of applications where cast polyurethane blades prove themselves — and the industries where you find them.

Conveyors & material handling

Primary and secondary cleaners, belt wipers: blades that lift material off at the discharge point without marking the belt.

See the conveyor industry →

Pulp & Paper

Doctor blades and roll cleaning blades: steady, gentle contact on surfaces that turn continuously, in a wet environment.

See the pulp & paper industry →

Mining, quarries & other industries

Ceramic bead blades for frozen and abrasive environments: the blade keeps its bite where rubber gives up.

See the other industries →

Questions about polyurethane scrapers and blades

Which hardness should you choose for a polyurethane scraper? +

It depends on the project. Hardness is a trade-off set by the surface to be cleaned, the contact pressure, the speed and the material to be removed: a blade that is too hard can wear the surface, a blade that is too soft can lose its effectiveness. Depending on the application, we suggest a starting hardness, then an adjustment based on the results observed.

Can you make a scraper with a steel backing? +

Yes, depending on the project. The polyurethane can be bolted or overmolded onto a steel plate or insert with mounting holes. The steel backing provides the rigidity and the mounting on the equipment, and can often be reclaimed and recovered when the polyurethane lip is worn.

Can you reproduce a worn scraper without a drawing? +

Yes, in many cases. From a worn scraper or a sample, we can reproduce the part and, depending on the project, revisit the hardness, the thickness or the contact angle to try to improve service life.

A scraper to design or to copy?

Send us the worn blade or a photo, along with the surface to be cleaned, the material to be removed and the equipment — depending on the project, we propose the hardness, the geometry and the mounting method. Useful in particular for conveyors and material handling as well aspackaging and extrusion.

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Scrapers, blades and wipers in polyurethane