Washing Plant Hub

Washing cost per piece = [(Labour cost/shift + Chemical cost/batch + Water cost/batch + Fuel or Steam cost/batch) ÷ pieces processed per batch] × (1 + overhead%). Add your factory's target profit margin on top to get the selling price per piece. The Washing Cost Calculator breaks this into five cost components so you can pinpoint which element is consuming the most margin — often chemicals or steam in enzyme and bleach wash processes.

Industry benchmarks by wash type (litres per kg of fabric loaded): Basic rinse wash — 20–35 L/kg; Enzyme wash — 40–60 L/kg; Stone wash — 60–80 L/kg; Bleach wash — 80–120 L/kg; Heavy denim processing with multiple baths — 100–150 L/kg. GOTS and ZDHC certified factories targeting international sustainability programmes aim for below 60 L/kg across all processes through bath reuse systems, counter-current rinsing, and automatic dose control.

Liquor ratio is the ratio of water volume (litres) to fabric mass (kg). Recommended ranges: Enzyme wash — 8:1 to 12:1 (8–12 litres of water per kg of fabric); Stone wash — 10:1 to 15:1; Bleach wash — 10:1 to 20:1; Bio-polishing — 6:1 to 10:1. Lower liquor ratios reduce water and chemical consumption but demand better machine agitation and process control for uniform results. Higher ratios are easier to control but generate more effluent and inflate chemical cost. Our Water Consumption Calculator lets you model any liquor ratio and batch size.

Steam requirement = [mass of water (kg) × specific heat capacity (4.18 kJ/kg·°C) × temperature rise ΔT (°C)] ÷ [steam enthalpy at operating pressure (kJ/kg) × boiler thermal efficiency]. Example: heating 1,000 litres of water from 25°C to 60°C requires 1,000 × 4.18 × 35 ÷ (2,256 × 0.85) = approximately 85 kg of steam. Our Steam Consumption Calculator automates this: enter fabric load, liquor ratio, start and target temperatures, and boiler efficiency, and get steam demand in kg/hr and daily totals.

Per AATCC 135 (dimensional change after home laundering): ≤3% shrinkage is excellent and meets most buyer specifications without pattern compensation. 3–5% is acceptable for many buyers but may require pre-washing or graded pattern compensation. Above 5% in warp direction typically triggers a quality hold — common root causes include incorrect pre-shrinking treatment, wash temperature too high, excessive mechanical agitation, or fabric construction issues at the yarn level. Our Shrinkage Calculator measures actual shrinkage from before and after wash measurements and calculates the compensated pattern dimension.

ETP (Effluent Treatment Plant) is a wastewater treatment system that removes colour pigments, dissolved chemicals, heavy metals, and BOD/COD from dyeing and washing plant discharge before release to the environment. In Bangladesh, the Department of Environment (DoE) mandates functional ETPs for all dyeing, washing, and finishing factories under the Environment Conservation Rules 1997 and subsequent amendments. Non-compliance risks factory closure, fines under the Environment Court Act, and loss of LEED, GOTS, OEKO-TEX, and buyer sustainability certifications. Our ETP Cost Calculator tracks treatment cost per m³ of effluent — a key compliance reporting metric.

Rewash percentage = (Pieces rejected and re-washed ÷ Total pieces washed) × 100. A rewash doesn't just mean repeating the wash process — it also incurs additional chemical, water, steam, labour, and machine time costs, and can damage the fabric if the cumulative process exposure exceeds specification. Typical acceptable rewash rates for certified factories are below 3–5%; above 10% indicates a systemic quality or process control problem. Our Rewash Percentage Calculator quantifies both the rejection rate and the additional cost per piece so you can evaluate corrective action ROI.

Chemical dosage depends on the process recipe, fabric weight, and liquor volume. Percentage on weight of fabric (% owf) method: Chemical amount (kg) = fabric weight (kg) × dosage rate (% owf) ÷ 100. Grams per litre (g/l) method: Chemical amount (g) = liquor volume (litres) × concentration (g/l). Example for enzyme dosage at 2% owf on a 200 kg fabric load: 200 × 2 ÷ 100 = 4 kg of enzyme. Always verify dosage against the chemical supplier's Technical Data Sheet (TDS) as concentrations vary between products. Our Chemical Consumption Calculator handles both % owf and g/l methods.