In the high-output world of corrugated packaging, the Double Facer (or bridge conveyor) is where quality and speed meet. At this stage, the conveyor belt—known as the corrugator belt—must transport hot, damp cardboard through a heating and cooling section while maintaining absolute synchronization.

For plant managers and maintenance engineers, the belt is not just a carrier; it is a thermal regulator and a friction interface. Choosing an inferior belt leads to "warp" in the cardboard, edge delamination, and frequent line stoppages for tensioning. At ANNILTE, we have engineered a range of heat resistant corrugator belts that master the complex physics of steam, heat, and pressure.

1. Mastering the Heat: Material Purity and Steam Resistance

A corrugator belt operates in a constant "steam bath." Standard polyester belts often suffer from Hydrolysis—a chemical breakdown caused by moisture and heat—which makes the belt brittle and causes the surface to peel.

The ANNILTE Advantage: Our belts utilize a high-performance blend of Nomex (Meta-aramid) and Kevlar (Para-aramid) fibers combined with heat-stabilized synthetic polymers. This fiber matrix is specifically designed to resist hydrolysis, ensuring the belt remains supple and maintains its grip even after months of exposure to high-pressure steam.

2. Zero-Stretch Performance: The HST Difference

In cardboard production, even a 1mm deviation in belt movement can cause "fish-tailing" or uneven edges in the final sheet. Most belts on the market stretch over time, requiring frequent take-up adjustments.

ANNILTE belts undergo a proprietary Secondary Heat-Setting (HST) Process. We pre-stress and thermally stabilize the material at the factory, ensuring that the belt exhibits Zero-Stretch performance on your machine. For the facility manager, this means perfectly aligned cardboard and significantly fewer labor hours spent on tracking adjustments.

3. Capillary Action: Optimized Drying for Flat Cardboard

The goal of a corrugator belt is to wick moisture away from the paper as it passes through the heating section. If the belt is too dense or lacks absorption, moisture gets trapped between the belt and the paper, causing the cardboard to warp or "bubble."

We engineer our Needle-Punched Corrugator Belts with a specific Permeability Matrix. The fiber structure is optimized for maximum capillary action, allowing steam to escape and moisture to be absorbed rapidly. This leads to faster drying times and allows you to run your production line at higher speeds without compromising paper quality.

4. Edge Protection and Wear Resistance

The edges of a corrugator belt are the first points of failure due to friction against side guides and the constant abrasive contact with paper edges.

ANNILTE provides Reinforced Edge Technology. By integrating high-tenacity aramid fibers into the edges and applying a heat-resistant coating, we prevent the "fraying" that usually precedes a total belt snap. Our belts meet international DIN and ISO standards for abrasion resistance, extending the service interval by up to 30% compared to generic alternatives.

5. Seamless Joining for "Zero-Marking" Quality

For high-end printing, the surface of the corrugated board must be perfectly smooth. A bump in the conveyor joint will leave an embossed mark on every sheet, leading to rejected batches in the box-making phase.

At ANNILTE, we utilize High-Frequency (HF) Seamless Joining. Our joints are indistinguishable from the rest of the belt in both thickness and flexibility.

• Result: No "joint-ghosting" on the paper.
• Benefit: Consistent pressure distribution for perfect bonding of the fluting and liner.