Dryer-fabric enquiries often begin with three numbers: width, length, and permeability. Those numbers are necessary, but they are not enough to select a fabric.
A dryer section contains positions with different sheet-support demands, temperatures, ventilation conditions, contamination loads, and mechanical risks. A fabric that runs well in one group can be a poor choice in the next. Selection should therefore be position by position, with a clear reason for every design choice.
Before discussing weave, first ask what the fabric must do in that position.
Early dryer groups often handle a weaker, wetter sheet and may place more emphasis on support and runnability. Later groups handle a stronger sheet but can expose the fabric to different temperatures, deposits, ventilation conditions, and abrasion risks. Single-felted groups, double-felted groups, top positions, and bottom positions also impose different demands.
Record the exact group and position. “Dryer section” is not a complete location.
Tissue, fine paper, recycled liner, kraft paper, and pulp drying do not ask the same thing from a dryer fabric. Lightweight or mark-sensitive grades may need different support characteristics from heavy packaging grades. Recycled furnish can bring a higher stickies load and change cleaning priorities.
Higher speed increases the importance of sheet control, dimensional stability, guiding response, and aerodynamic behavior. Use both normal running speed and planned maximum speed. A fabric selected only for today's speed may become a constraint after a production increase.
Document whether the group is single- or double-felted, the fabric path, roll diameters, stabilizers, vacuum rolls, pocket ventilation, and any close-running seals. These details influence fabric stability, abrasion risk, and air movement.
Dryer-hood conditions combine heat and moisture. This can be more demanding than dry heat alone. Give the supplier operating temperature, hood balance concerns, condensate issues, and any history of brittle or chemically degraded yarns.
Permeability affects air and moisture movement, but it is a system parameter rather than a stand-alone quality grade. Compare the current fabric's initial value, in-service trend, and end-of-life condition. If drying declines while the fabric becomes visibly filled, the cleaning and contamination picture matters as much as the original specification.
For a deeper explanation, read How Dryer Fabric Air Permeability Affects Efficiency.
Identify the deposit rather than calling everything “dirt.” Pitch, stickies, coating ingredients, fiber dust, oil, and chemical precipitates respond differently to fabric structure and cleaning. Note where deposits begin and whether they follow a cross-machine pattern.
Record normal tension, guide movement, edge curling, rubbing points, and any tendency to run to one side. Uneven tension or a mechanical contact point can destroy a suitable fabric. A new design should not be expected to compensate indefinitely for a machine defect.
The seam is a functional part of the fabric. The mill should discuss seam strength, thickness, joining method, installation access, marking sensitivity, and the condition of the seam after service. A seam that is easy to install but unsuitable for the position is not a good compromise.
Both constructions can work well when correctly applied.
| Question | Woven Dryer Fabric | Spiral Dryer Fabric | | --- | --- | --- | | Surface and support | Broad range of weave options, including smoother surfaces | Depends on coil and insert design; check marking sensitivity | | Permeability range | Can be engineered across many dryer positions | Often selected where more open structure is useful | | Contamination release | Depends on yarn shape and weave | Open coil structure can be easier to clean in suitable applications | | Seam | Woven seam options vary by design | Pin-style joining is common and can simplify installation | | Mechanical conditions | Strong woven designs suit demanding tension and abrasion positions | Must be matched carefully to roll, edge, and sheet-control conditions |
Do not choose spiral simply because it looks more open, or woven simply because it looks smoother. Start with the position's limiting problem.
Explore woven polyester dryer fabrics and spiral dryer fabrics.
A used fabric is a record of the machine.
Inspect:
Mark the running direction and machine side before removing the sample. Without orientation, much of the diagnostic value is lost.
An exact repeat is sensible only when the current fabric meets life, runnability, drying, and quality targets. If it does not, record the failure before placing the next order.
Test method, pressure, units, and fabric condition matter. Ask suppliers to state the test standard and do not mix values taken by different methods.
Heat, moisture, chemistry, tension, and time interact. A nominal temperature rating alone does not describe hydrolysis resistance or long-term dimensional stability.
Fabric design and cleaning capability must work together. Shower pressure, nozzle condition, oscillation, suction, chemical compatibility, and shutdown washing all affect how long useful permeability is retained.
Define success before installation. Possible measures include service days, stable permeability, fewer guiding corrections, lower steam demand at comparable production, reduced sheet breaks, or cleaner seams and edges.
Send the following with the request:
If several positions use different specifications, prepare one sheet per position. This prevents data from being mixed during quotation.
Record the new fabric's installation date, initial tension, tracking behavior, permeability, seam condition, and production conditions. Check again after the fabric has settled. Later, compare performance under similar grade and speed conditions.
The goal is not simply to achieve a long calendar life. A dryer fabric should provide stable sheet handling, usable permeability, acceptable cleanliness, and predictable removal from service.
Dryer-fabric selection is an application decision, not a catalog lookup. The best starting point is a complete position sheet and a clearly documented problem. When the supplier understands the dryer group, paper grade, speed, ventilation, contamination, seam, and service history, the recommendation becomes easier to evaluate—and more likely to produce a measurable result.
HengXing Technical Team
Paper Machine Clothing Application Team
HengXing Corp manufactures forming fabrics, dryer fabrics, press felts, and industrial fabrics and supports paper mills with product selection and application troubleshooting.
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