A double facer belt (also called a corrugator belt or double backer belt) is a specialized endless conveyor belt used in the double facer section of a corrugator line.
Its main job is to press and convey the combined corrugated board over heated plates so that the bottom liner bonds firmly to the fluted medium (and top liner, in multi-wall boards).
It must provide uniform pressure, stable transport, and efficient heat/moisture transfer to ensure strong bonding, flatness, and consistent board quality.
Common Types
- Standard Double Facer Belts – Balanced performance for most board grades.
- High-Permeability Belts – For faster moisture release, ideal for high-speed lines.
- Aramid-Reinforced Belts – For heavy board grades and high tension applications.
- PTFE-Coated Belts – For reduced starch build-up and easier cleaning.
- Quick-Splice Belts – For faster installation and reduced downtime.
Construction Features
Base Fabric
Multi-layer woven structure from polyester, aramid (Kevlar®), or blends for high tensile strength and dimensional stability.
Surface Treatment
PTFE (Teflon) coating offers superior heat resistance and low friction, while resin or rubber treatments improve grip and wear resi
Air Permeability
Engineered airflow allows steam to escape during bonding, reducing blister formation and improving board
Edge Reinforcement
Special reinforced edges minimize fraying and extend belt service life under continuous ope
Heat Resistance
Designed for continuous use at temperatures of 180–200°C in the hot plat
Thickness & Density
Optimized construction ensures efficient heat transfer, cushioning, and excellent finished board q
Endless Splice
A seamless endless joint provides smooth running, uniform pressure distribution, and reliable long-term performan
Key Selection Factors
When choosing a double facer belt, consider:
- Machine Width & Length – Must match corrugator’s specifications.
- Operating Temperature – Belt must withstand hot plate section’s heat profile.
- Board Grades & Flute Types – Heavy boards may require stronger, less compressible belts.
- Production Speed – High-speed lines need belts with excellent heat transfer and stability.
- Moisture Conditions – Steam-heavy environments require high air permeability.
- Surface Grip – Enough to hold the board without marking it.
- Splice Type – Endless or mechanical, depending on downtime tolerance.
- Compatibility with Pressure System – Belt must work with your press shoe, ballast roll, or sandwich system.
Key Selection Factors
When choosing a double facer belt, consider:
- Machine Width & Length – Must match corrugator’s specifications.
- Operating Temperature – Belt must withstand hot plate section’s heat profile.
- Board Grades & Flute Types – Heavy boards may require stronger, less compressible belts.
- Production Speed – High-speed lines need belts with excellent heat transfer and stability.
- Moisture Conditions – Steam-heavy environments require high air permeability.
- Surface Grip – Enough to hold the board without marking it.
- Splice Type – Endless or mechanical, depending on downtime tolerance.
- Compatibility with Pressure System – Belt must work with your press shoe, ballast roll, or sandwich system.
Maintenance & Care
To maximize belt life and board quality:
- Regular Cleaning – Remove starch, dust, and paper debris to prevent glazing.
- Tension Checks – Maintain correct tension to avoid slippage or stretching.
- Tracking Adjustment – Keep belt centered to prevent edge wear.
- Avoid Overheating – Monitor hot plate temperatures to stay within belt limits.
- Edge Protection – Inspect for fraying and repair promptly.
- Scheduled Rotation – Swap belts between machines/zones if possible to even wear.
- Proper Storage – Store flat or on large rolls in a dry, cool environment.
Key Parameters to Order
|
Parameter |
Why It Matters |
Typical Range / Note |
|
Belt Width |
Must match machine width |
Machine-specific |
|
Belt Length |
Correct fit for tensioning system |
Machine-specific |
|
Thickness |
Affects heat transfer & cushioning |
6–10 mm typical |
|
Heat Resistance |
Prevents degradation |
180–200 °C continuous |
|
Air Permeability |
Allows steam escape |
Measured in CFM or L/m²/s |
|
Tensile Strength |
Withstands load & tension |
High-strength polyester/aramid |
|
Surface Coefficient of Friction |
Controls grip |
Balanced to avoid marking |
|
Splice Type |
Impacts downtime & seam quality |
Endless, mechanical, or quick-splice |
|
Edge Reinforcement |
Extends life |
Woven or coated edges |
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