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Paper & printing drying equipment selection: form, heat sensitivity and recommended machine for 3 materials (Label paper, Coated paper, White card board and others), with the full line configuration and trial run points.
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Paper & printing
3 material(s) listed for this industry.
Paper & printing 3 items
| Material | Form | Heat sensitivity | Recommended dryer | Alternative | Selection notes |
|---|---|---|---|---|---|
| Label paper | Flake | Heat-sensitive | Flash Airflow Dryer | Rotary Dryer |
Flakes cannot be rubbed, and that is the first hard constraint in selecting the machine. A label paper has three layers: the base paper, the coating and the adhesive, and the coating fails first — pushed past its limit it forms a hard skin, the surface turns brittle and curling follows. Our approach is a flash airflow line: the sheets are carried by the hot air and heat transfer is completed within seconds, with almost no mechanical action. The inlet temperature is set by the coating's heat limit, typically somewhere between 120 and 150°C depending on the grade, and the air volume is adjusted separately: hold the temperature first, then raise the air volume slowly so the sheets do not curl as they dry fast. At 500 kg/h dry basis taking moisture from 30 percent down to 2 percent, an airflow line needs parallel units or a larger air volume, so calculate the evaporation rate before selecting rather than sizing on dry tonnes.
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| Coated paper | Flake | Heat-sensitive | Flash Airflow Dryer | Rotary Dryer |
This is the same problem as label paper, but the coated face is more heat sensitive. Coatings usually contain wax, starch or a pigment binder, and under heat they soften first and then skin over; above a certain temperature the sheet shows speckling or loses powder, and the web contracts unevenly. The route is still mainly the flash airflow line, because the residence time is measured in seconds and the coating has not had time to accumulate heat before it leaves the drying zone. Set the inlet temperature by the grade's ceiling and start below 130°C to leave margin for batch variation, adjusting air volume and temperature separately: take the surface moisture off with low air volume first, then raise it gradually, so the sheet does not lose water at the surface fast enough to curl. Coated paper also shrinks across the web, and the moisture difference between positions in one sheet shows up directly as curl, so the discharge end needs flattening and cooling designed in — a curtain or belt cooler is more stable than free fall.
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| White card board | Flake | Heat-sensitive | Flash Airflow Dryer | Rotary Dryer |
The difficulty with white cardboard is not heat sensitivity but stiffness and deformation. As the web dries it loses both moisture and stiffness; while it is still wet it cannot carry its own weight, and coming out of the dryer it folds, takes a crease and curls at the edges. The advantage of a flash airflow line is that the material is carried by the hot air the whole way, with a small drop height and little mechanical action on the sheet, provided the conveying upstream is steady and the web never enters folded or doubled. The inlet temperature follows the grade ceiling, and white cardboard is more forgiving than coated stock; air volume and velocity are the other variable, because too high a velocity lifts an already formed sheet and makes the edges shrink unevenly. What to confirm at selection is the adjustable range of the air volume, not simply whether it can dry. Moisture has to be even, with the cross-direction spread kept within one percentage point, otherwise curl and dimensional instability are hard to avoid.
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Recommendations above are a selection direction based on material form, heat sensitivity and throughput. Capacity varies with the material, the initial moisture content and the target final moisture, and the formal figures come from a trial run.
Four steps to a selectionHow to choose
- Material form Powder, granule and flake material can be carried in an air stream; blocky, paste-like and fibrous material has to be tumbled inside a drum.
- Heat sensitivity This comes first. Where the material is heat-sensitive and its form allows air conveying, a flash airflow dryer is the natural choice — regardless of output, because exposure to heat is measured in seconds. Material that tolerates heat can be dried more slowly and at lower cost.
- Throughput and budget Where budget and batch size matter more than output, a batch rotary dryer carries relatively low capital cost and suits a small plant or workshop. For high output, a continuous rotary dryer feeds and discharges at the same time and runs non-stop.
- Environment and energy Where emissions are constrained or there is no steam supply, electric and electromagnetic heating avoids an open flame and responds faster.
Where the material is corrosive (acidic, chloride-bearing, saline and so on), the parts in contact can be specified in stainless steel: 201 / 304 / 316L / 430 / 2205 duplex and other grades to order.
Need a selection based on your material?
Tell us the material, initial moisture content and target final moisture, and we will propose a configuration that fits.
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Material · Selection · Trial run