Round Belts (round belt in PU /TPE): The practical guide to types, splice and selection
Round Belts are a simple and flexible solution for transportation and easy power transfer – especially on powered runways, in packaging machines and in environments where chemical resistance and temperature tolerance are important. Here you will get an easy-to-understand (but technically correct) overview of materials, diameters, surfaces, reinforcements and splice/welding.
What is a round belt – and why is it used?
One round belt (also called round belt or round belt) is a belt with circular cross-sectionIt is mainly used for:
Typical applications
- Driven runways and roller conveyors
- Light transport and packaging applications
- Food industry (cleaning, chemical resistance, temperature)
- Machines where you can weld the belt on site
Why round belts are po pu learn
- Very flexible and easy to install
- Can often welded to an endless belt on site
- Available in many variants (diameter, hardness, surface)
- Good for light operation and “gentle” power transfer
Round Belts are typically chosen when installation, flexibility and reliability in light applications are more important than maximum power transmission.
Types of round belts : PU , TPE and surfaces
PU round belt (polyurethane)
PU round belts are widely used because they combine wear resistance, elasticity and stable operation in many environments. They are often used for conveyor belts and light transport.
TPE round belt (Thermoplastic Elastomer)
TPE profiles are typically chosen when special properties are desired in terms of flexibility or temperature, depending on the application.
Smooth vs. rough surface
Round Belts can be supplied with smooth or rough surface. The choice depends on how much grip you need and whether you want more “friction” against rollers or workpieces.
See selections and subcategories here: Round Belts and Round belt & round belt (extruded PU belts).
Diameters, hardness and selection (Ø2–Ø20 mm)
Round Belts are typically available in diameters from Ø2 to Ø20 mmThe right diameter depends mainly on: load, belt speed, roller diameter, and how “tight” the system needs to run.
How to choose quickly
| If you need… | So typically look for… | Why |
|---|---|---|
| Easy transport on roller conveyor | Small to medium diameter + standard PU | Good flexibility and easy splice |
| More tensile strength / longer lengths | Reinforced round belt | Reinforcement increases tensile strength and service life |
| Grip against the object | Rough surface | Increases friction |
| Easy cleaning | Smooth surface | Easier to keep clean |
If in doubt: start by measuring the diameter of the old round belt (with a caliper) and assess whether the operation/environment requires smooth/rough or reinforcement.
Reinforced round belts : when and why?
To high loads and long belt lengths A reinforced round belt is often recommended. Reinforcement increases the tensile strength and extends the life of the belt.
Typical reinforcements
- Polyester – good all-rounder for many applications
- Aramid (Kevlar) – high strength and stability
- Steel – high tensile strength for demanding operation
- PU - fiberglass – weldable solution in selected variants
See the category here: Round Belts with reinforcement.
Some reinforced profiles are also stocked with a center hole, so that round belts can be assembled with a nipple - smart in special splice situations.
Splice/welding of round belts (step-by-step)
A big advantage of round belts is that they can often welded together on siteThis means that you can typically avoid disassembling the entire system when the belt needs to be replaced.
Step 1: Cropping (90°)
Step 2: std payment
Step 3: Welding
Step 4: Cooling and finishing
If you want to minimize downtime: always have some extra round belt in stock + a simple welding kit for emergency repar.
Tools for splice – what do you need?
For splice and welding at your own location, the following is typically recommended:
- Angle pliers for clean 90° cutting
- Clamps for fixation
- Welding tools (e.g. EErgo or Multi TC)
- Edge cutter/knife for finishing
See the tools category here: Welding tools for round belts.
Food-approved round belts : what does this mean in practice?
In food production, there are high demands on materials, cleaning and documentation. That is why there are round belts that are developed for environments with frequent cleaning and requirements that the material does not emit unwanted substances.
What you typically need to know when ordering
- Whether required FDA/EU documentation for your process
- Cleaning agents and temperatures in your environment
- Whether you need special properties (e.g. hydrolysis resistant or metal detectable)
Troubleshooting: when round belts slip, jump or wear out
Typical symptoms and solutions
| Symptom | Typical cause | Quick solution |
|---|---|---|
| Sliding on rollers | Too low voltage, slippery surface, dirt/grease | Clean, adjust tension, consider rough surface |
| Jumps off / wanders | Misalignment, incorrect rollers, lateral forces | Check alignment and runway geometry |
| Wear during splice | Unclean cut surface or incorrect welding/temperature | Make a clean 90° cut, correct temperature and cooling time |
| Too short a lifespan | Too high load compared to round belt type | Choose reinforced round belt or larger diameter |
Where can you buy round belts ? (open lengths and pre-assembled)
Round Belts can often be ordered as open lengths (round belt in meters) or as pre-assembled, endless round belts in customer-specific length – depending on the task.
Open lengths (meters)
- Good if you want to weld on site yourself
- Smart for maintenance/emergency
- Flexible if lengths vary
Pre-assembled round belts
- Easy if you want “ready to install”
- Good at even lengths and repeated replacements
- Can be advantageous for larger quantities
See round belts category here: www.fecconsulting.dk/ round belts
FAQ: Frequently asked questions about round belts
Can I weld a round belt myself – without special equipment?
It can be done in some cases, but for a strong and reliable joint, clamps + correct welding tools are recommended.
Which surface should I choose: smooth or rough?
Smooth is often easier to keep clean. Rough surfaces are chosen when you want more grip on rollers or workpieces.
When should I choose a reinforced round belt?
For longer lengths, higher loads or when you want to minimize stretch and increase tensile strength.
Why do round belts often break at the joint?
Typical causes are crooked cut, incorrect temperature, too short cooling time or too high load. Use correct temp (TPE 240°C / PU 290°C) and allow cooling time.