Flatwork Ironer Speed & PPH Calculator
Determine roll finishing speed (FPM), sheets and tablecloths processed per hour (PPH), steam evaporation capacity, and feeding labor requirements.
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How Flatwork Ironer Speed & Evaporation Work
Flatwork ironers evaporate residual moisture from damp linens while pressing fibers against polished steam-heated concave chests:
Max Roll Speed (FPM) = Steam Heat Transfer (BTU/hr) / (Water Evaporated per Linear Foot × 1,050 BTU/lb)
Pieces Per Hour (PPH) = (Speed FPM × 60 × Lanes) / (Linen Length in Feet + Gap Spacing)
Steam Consumption (lbs steam/hr) ≈ 1.3 × Water Evaporation Rate (lbs/hr)
The Moisture Trap: If washer extraction is poor (e.g., 65% moisture retention instead of 45%), the ironer must be slowed down by nearly 40% to prevent damp, soggy sheets from exiting into the automatic folder.
Frequently Asked Questions
Why must flatwork ironers maintain at least 100 to 125 PSI steam pressure?
Saturated steam temperature is directly tied to pressure. At 125 PSI, steam reaches 353°F (178°C). Higher chest temperatures transfer thermal energy into wet linen rapidly, enabling high line speeds without leaving damp patches.
Why can sheets go directly from washer-extractors to the ironer without pre-drying?
Commercial high-extract washers pull out enough water (45% residual moisture) that the steam ironer can completely evaporate the remaining moisture in a single 4-second pass, eliminating the tumbler drying step and cutting linen energy costs by 50%.
What causes wax buildup and scorch marks on ironer rolls?
Ironer guide ribbons and synthetic roll padding require regular silicone or paste waxing to prevent friction buildup. However, running an ironer with excessive temperature or low linen throughput causes wax to scorch and bake onto the chest.