Multi-grade paper mills — producing a mix of printing and writing papers, newsprint, specialty grades, and converting papers — face a dryer fabric selection challenge that single-grade mills do not. The same dryer section position may run woodfree printing paper (60-120 g/m²) on Monday, newsprint (40-52 g/m²) on Wednesday, and specialty release base paper (40-80 g/m²) on Friday. Each grade change shifts the optimal CFM, surface requirement, and contamination profile. A fabric optimized for one grade may perform poorly on another, and the mill cannot afford to change fabrics for each grade run. These multi-grade mills need a versatile dryer fabric specification — engineered for the grade mix as a whole, not for a single reference grade — that delivers acceptable performance across the full product portfolio without favoring one grade at the expense of others.
Multi-grade paper mills — producing a mix of printing and writing papers, newsprint, specialty grades, and converting papers — face a dryer fabric selection challenge that single-grade mills do not. The same dryer section position may run woodfree printing paper (60-120 g/m²) on Monday, newsprint (40-52 g/m²) on Wednesday, and specialty release base paper (40-80 g/m²) on Friday. Each grade change shifts the optimal CFM, surface requirement, and contamination profile. A fabric optimized for one grade may perform poorly on another, and the mill cannot afford to change fabrics for each grade run. These multi-grade mills need a versatile dryer fabric specification — engineered for the grade mix as a whole, not for a single reference grade — that delivers acceptable performance across the full product portfolio without favoring one grade at the expense of others.
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 engineers multi-grade dryer fabric specifications using a "grade envelope" methodology: instead of calculating the optimal CFM for one reference grade, we calculate the acceptable CFM range that delivers satisfactory performance across your entire product portfolio. The resulting specification balances the most demanding grade requirements — typically the lightest grade (determines minimum CFM and maximum surface smoothness) and the heaviest grade (determines required evaporation capacity and tensile rating) — to create a single fabric that performs across the full range. The specification includes: (1) a CFM calibrated to the midpoint of the acceptable range, with ±5% tolerance to cover the envelope; (2) a surface profile fine enough for the most demanding grade in the mix; (3) PTFE coating if any grade in the portfolio has significant recycled content or contamination risk; (4) spiral seam for mixes that include lightweight grades below 50 g/m².
Grade-envelope engineering — one fabric optimized for your full product portfolio, not a single grade
Balanced CFM specification covering lightest-to-heaviest grade range — no per-grade compromise
Surface profile fine enough for the most demanding grade in the mix — prevents quality downgrades
PTFE coating recommendation based on the highest-contamination grade in the mix — universal protection
Simplified inventory — one specification across multiple positions and grade runs
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
The alternative to multi-grade fabric engineering is either: (1) stocking multiple fabric specifications and changing fabrics for each grade run (impractical for most mills due to downtime cost and inventory complexity), or (2) accepting suboptimal performance on some grades. PAPTEX grade-envelope engineering eliminates this trade-off — one fabric specification, engineered for the full grade range, delivering consistent performance without grade-change compromises. The value is in production flexibility and simplified maintenance planning.
vs Competitors
In-House Manufacturing
120,000 m² factory, 500+ employees. Every step in-house — no outsourcing.Engineered to Your Machine
38+ senior engineers custom-design to your machine brand, model, and speed. Not off-the-shelf.Triple ISO Certified
ISO 9001 Quality · ISO 14001 Environmental · ISO 45001 Safety. 29+ patents.Global Support
Serving 30+ countries. Engineer response within 24 hours for technical inquiries.Engineering answers to the most common pre-purchase questions
Didn't find your question? Ask an engineer directly.
Ask an EngineerDive deeper into the technical topics on this page — expert articles from the PAPTEX Knowledge Center
Explore other dryer fabric solutions for the same product — by grade, brand, speed, industry, or common problem
Send us your product portfolio (all grades, basis weight ranges, and typical speeds). Our application engineer responds within 24 hours with a grade-envelope analysis and multi-grade fabric recommendation.