Duplex board machines operate at moderate temperatures (130–160°C) but face a unique challenge: high caliper (200–500 g/m²) and multi-ply construction (2–4 plies) mean moisture removal is slow and uneven. The top ply — typically bleached chemical pulp — must exit the dryer section with a flawless surface, because any fabric mark transfers through the coating and ruins printability. Meanwhile, the filler plies (recycled fiber, mechanical pulp, or broke) dry at different rates, creating internal moisture gradients that risk ply bond failure. Standard dryer fabrics lack the surface smoothness, caliper tolerance, and dwell-time stability that duplex board production demands.
Duplex board machines operate at moderate temperatures (130–160°C) but face a unique challenge: high caliper (200–500 g/m²) and multi-ply construction (2–4 plies) mean moisture removal is slow and uneven. The top ply — typically bleached chemical pulp — must exit the dryer section with a flawless surface, because any fabric mark transfers through the coating and ruins printability. Meanwhile, the filler plies (recycled fiber, mechanical pulp, or broke) dry at different rates, creating internal moisture gradients that risk ply bond failure. Standard dryer fabrics lack the surface smoothness, caliper tolerance, and dwell-time stability that duplex board production demands.
Hidden Costs
Downtime, energy waste, and sheet defects from suboptimal fabricsEfficiency Loss
Generic solutions don't match your specific operating conditionsDecision Delay
Procurement cycles stretch without engineering-grade selection guidancePAPTEX Polyester Dryer Fabric — Flat Yarn Series (PAPTEX-FY-4500) is engineered for duplex board dryer sections. The ultra-smooth flat yarn surface prevents fabric mark transfer to the coating-grade top ply — critical for folding boxboard where print quality sells the package. Uniform air permeability (350–650 CFM) manages the moisture gradient across 200–500 g/m² caliper, eliminating the internal moisture differential that causes ply bond failure. 100% PET monofilament maintains dimensional stability through extended dwell times at 130–160°C — no surface degradation, no CFM drift, no edge flutter. Each fabric is custom-manufactured to your machine dimensions, seam type, and CFM target.
Ultra-smooth flat yarn surface eliminates fabric mark transfer to coating-grade top ply — protects printability and coating adhesion
Uniform moisture removal through 200–500 g/m² caliper — prevents ply bond failure caused by internal moisture differential across multi-ply construction
Extended dwell time stability at 130–160°C — consistent CFM and surface smoothness over full service life, no thermal degradation
Caliper tolerance ± 0.05 mm ensures even heat transfer across full machine width — no wet streaks, no uneven coating holdout
Pin seam with ≥ 85% strength retention — fast installation, minimal downtime, no sheet marking at the seam line
100% Polyester (PET) Monofilament
400 – 1,200 m/min
6 – 14 months (varies by paper grade and operating conditions)
12 – 400 g/m²
Core parameters for Polyester Dryer Fabric. See the product decision page for complete specifications.
| Material | 100% Polyester (PET) Monofilament |
| Construction | Flat yarn, multi-shed weave |
| Air Permeability | 350 – 650 CFM (at 125 Pa, ISO 9237) |
| Continuous Operating Temperature | Up to 180°C |
| Peak Temperature | 200°C (≤ 15 minutes) |
| Tensile Strength (Warp) | ≥ 80 kN/m |
| Tensile Strength (Weft) | ≥ 45 kN/m |
| Elongation at Break (Warp) | ≤ 2.5% at 80 kN/m |
Compatible Machine Brands
Compared to standard polyester dryer fabrics, PAPTEX Flat Yarn Series provides the surface smoothness that duplex board producers cannot compromise on. Industry-typical caliper tolerance (± 0.10 mm) creates heat transfer variation that shows up as coating mottle on the printed sheet — PAPTEX delivers ± 0.05 mm. With 20+ QC inspection points per fabric and factory-direct pricing with no distributor margin, board mills receive dryer fabrics engineered for the coating-quality surface their customers demand.
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Share your duplex board machine parameters — width, speed, basis weight range, number of plies, and coating type. Our application engineer responds within 24 hours with a dryer fabric recommendation: CFM calculation, surface finish specification, seam selection, and a competitive quotation tailored to your board grade.