# Closed Spiral Belts: production, application and expertise

> Why closed spiral (compound balanced) belts suit small products and heat treatment up to 1,150 °C, where they are used and which variants Tribelt builds.

- URL: https://tribelt.jorisjonkers.dev/en/knowledge-centre/closed-spiral-belts-production-application-and-expertise
- Adapted from the official page: https://www.tribelt.nl/en/knowledge-centre/closed-spiral-belts-production-application-and-expertise
- This is a student test site for a university project on digital strategy, made with Tribelt's permission. It is not Tribelt's official website, which is tribelt.nl.

## What a closed spiral belt is

A closed spiral belt is a metal conveyor belt for processes that need a dense carrying surface, a stable run and precise product guidance. It is known in English as a compound balanced belt. Wire spirals are woven tightly into each other to form a flat, strong surface. Small products can travel on it safely, and the belt holds up under high temperatures and mechanical stress.

Main features:

- **Dense surface:** small items do not fall through or get damaged.
- **Stability:** the belt runs straight and predictably.
- **Heat resistance:** suitable for processes up to about 1,150 °C.
- **Made to measure:** built to the needs of the specific process.

## Benefits

- **Continuity:** steady, straight running keeps downtime and product loss down.
- **Robustness:** copes with heavy loads and high heat, so the belt lasts longer.
- **Even heat transfer:** the dense surface treats products uniformly in ovens, sterilisers and heat treatment lines.
- **Easy maintenance:** Tribelt's in-house production gives consistent quality and straightforward replacements.
- **Product protection:** small items stay on the belt and are not damaged.

## Applications

- **Bakery:** oven belts on which products are baked directly.
- **Pharmaceuticals:** sterilisation tunnels for controlled processing of medicines.
- **Metal and glass:** annealing, tempering, hardening, sintering and brazing.
- **Mechanical engineering:** discharge belts for machining equipment.
- **Heat treatment:** curtains or screens that keep heat inside tunnel furnaces.
- **Decorative products:** for instance in jewellery making, where precision matters.

## Tribelt variants and options

- **Wide spiral belt WG-I** with multiple inserts for versatile use.
- **Narrow spiral belt with S-hook (ES)** for very small products and precise guidance.

Typical specifications are a pitch of 5 to 25 mm, wire diameters of 0.8 to 3.15 mm, temperatures up to 1,150 °C and widths up to 4,000 mm. Options include side chains, flights, welded edges, raised side plates and PE1000 contact strips for quiet support. Because Tribelt produces everything in-house in Haaksbergen, it can adapt each belt to unusual temperatures, loads or product sizes. See the [closed spiral belts product page](https://tribelt.jorisjonkers.dev/en/conveyor-belts/compound-balanced-belts) for full data.

## Why choose a closed spiral belt

Where precision, stability and product protection come first, a closed spiral belt is a key part of the line. It combines a dense surface, a solid build and good heat transfer with the flexibility of custom manufacturing. In practice that means fewer damaged or lost products, a long service life with little maintenance, and a production process that keeps running.

[Ask Tribelt about closed spiral belts on tribelt.nl](https://www.tribelt.nl/en/contact)