A continuous pressure decatizing machine is a dry-finishing machine that sets woven and knitted fabric with saturated steam inside a pressurised vessel, reaching a setting depth atmospheric continuous decatizing cannot match without giving up continuous-line throughput. QL's WPF-LXZN-P sits at the end of the dry-finishing line, the pressurised option among the four ways to decatize.
Where this machine sits in the line, and what comes before and after
WPF-LXZN-P receives pre-shrunk fabric for continuous pressure decatizing. Woven routes use either WPF-ZW straightening → WPF-LTYS pin-chain pre-shrinking, or WPF-WDYS belt pre-shrinking → WPF-ZW straightening. Knits proceed directly from WPF-WDYS to decatizing. Optional airflow softening can follow, before inspection, rolling and packing.
The station offers four choices: WPF-JXZN-MAX batch, WPF-LXZN continuous, WPF-LXZN-P continuous pressure or kier decatizing. Select for throughput and setting requirements. WPF-LXZN-P can also serve as pre-treatment before kier decatizing or final treatment afterwards, according to the actual process.
What it changes in the fabric, top or yarn: handle, dimensional stability, lustre, cleanliness
Saturated steam inside the pressurised vessel acts on the fabric directly, so hand, appearance, and dimensional stability are set in the same pass: a lasting, natural lustre, brighter colour, a crisp body that stays firm without turning stiff, better drape, and stronger crease recovery. Residual steam and pressure-differential condensate are cleared as the fabric leaves, and twin heating plates outside the steaming tank block condensation on the vessel's inner wall, so there are no localised water marks or shade spots. Woven-and-knitted tension control covers both fabric types, and elastane-bearing knit stretch fabrics go through without curling at the edge or uneven treatment.
Why this machine is necessary: what happens without it, or with another method
Choose WPF-LXZN-P to combine pressurised steam treatment with continuous fabric flow. Adjustable steam pressure and independent pressure and tension settings provide the controls for a process matched to the fabric, handle, appearance and dimensional-stability target.
Select a decatizing method for the quality, setting objective, batch size and production rhythm. WPF-JXZN-MAX, WPF-LXZN and WPF-LXZN-P offer batch, continuous and continuous-pressure arrangements. Confirm kier decatizing or combined treatments against sample results and the complete line.
Setting the parameters: temperature, tension, speed, time
Vessel steam pressure is infinitely adjustable from 0 to 3 bar, corresponding to a saturated steam temperature inside the vessel of roughly 100–144°C. Mechanical and working speed both run 4–40 m/min, and drum pressure, steaming-tank pressure, steaming-tank steam pressure, felt-belt tension and air-cushion pressure are each set independently, with woven and knitted fabrics tensioned separately throughout. Continuous equipment carries no separate time setting — steam dwell time is a function of line speed, so slowing the speed lengthens dwell time accordingly.
There is no fixed setting for how these combine — pressure, speed and tension are worked out by trial on each fabric quality; ask QL for the process data sheet.
The questions customers ask most
- How do I choose between atmospheric continuous decatizing and pressure continuous decatizing (WPF-LXZN-P)?
- Can the autoclave/KD decatizing step be skipped and replaced with a continuous decatizing machine?
- For knit stretch fabric with spandex, how does continuous pressure decatizing avoid edge curling and uneven processing?
- Does pressure continuous decatizing risk shade variation across the width or batch-to-batch inconsistency?
- Atmospheric continuous decatizing does not set deep enough for heavy or high-density fabrics — what do I do?
- Does continuous pressure decatizing leak, wear out seals quickly, or cost more to maintain?
Which process routes it appears on
Read WPF-LXZN-P in the context of these routes: worsted top-dyed, worsted piece-dyed, woollen stock-dyed, woollen piece-dyed, wool-blend knitted fabric. Follow each branch to understand the equipment choice; a required process does not mean every quality uses the same model.
Give QL the fabric or top sample, existing upstream and downstream stations, and target finish to review configuration and process connections together.