Pre-Dryer for Stenter Machine

What is a Pre-Dryer?

A Pre-Dryer for Stenter Machine is engineered to enhance production speed and ensure improved chemical finishing processes. Typically, it is installed at the entrance of stenter machines, relax and equalizing dryers, tumbler dryers, and similar systems. Additionally, it can be placed at the exit of continuous washing, bleaching, and mercerizing lines.

Advantages of Pre-Dryer Machine

• Larger drum size with extended contact area:
  OZM utilizes Ø800 mm drums, which offer 25% more surface contact compared to Ø600 mm drums.
  (𝟒×∅𝟖𝟎𝟎 = 𝟓×∅𝟔𝟎𝟎)
• Zero fabric tension:
  Each drum in the OZM Pre-Dryer has an individual gearbox and control system, allowing operators to adjust tension independently between drums.
• Durable design:
  The stainless-steel drums ensure long service life even under continuous industrial use.
• Minimal fabric friction:
  PTFE Teflon-coated drums reduce surface resistance, preserving fabric quality.

Benefits of Pre-Dryer Machine

• Increased Production Efficiency:
  The Pre-Dryer machine enhances production speed by approximately 30–35%, depending on fabric type. This efficiency gain directly contributes to faster turnaround and higher output.

• Optimized Moisture Control:
  By reducing the moisture content of the fabric by 15%–35% after the first padder in the stenter or dryer machine, the Pre-Dryer ensures better fabric preparation for subsequent chemical processes.
  As a result, the second padder achieves more effective impregnation and delivers a softer, silkier fabric finish.

• Improved Finishing Quality:
  The machine provides uniform temperature and humidity distribution across the fabric width.
  Consequently, it eliminates center-to-side variations, prevents quality inconsistencies, and reduces operator error.

• Consistent Chemical Bath Concentration:
  The Pre-Dryer minimizes the amount of water carried into the second padder bath.
  Therefore, the chemical concentration remains stable even during extended production runs, reducing waste and ensuring consistent finishing.

• Better Padder Performance:
  Since the fabric enters the second padder while still warm, the padder can squeeze it more efficiently.
  This leads to better pick-up values and enhances the final fabric quality.

• One-Padder Finishing Capability:
  With optimized moisture and heat control, the machine enables finishing with a single padded stenter, which saves time, energy, and space.

Impact on Fabric Processing Speed

Tests conducted on six different types of knitted fabrics showed higher efficiency when using pre-heating. All samples passed through the stenter with and without the pre-dryer for comparison.

Pre-Dryer for Stenter Machines

• Speed Increase: 30–35%
• Cylinders: 3–4
• Working Width: 1800–3400 mm
• Steam Consumption:

  • 93–111 kg/h (3-cylinder, 2500 mm)

  • 129–147 kg/h (4-cylinder, 2500 mm)

• Electricity Use: 2.8 kWh

Pre-Dryer for Finishing Lines

• Speed Increase: 30–35%
• Cylinders:
  • 3 heating + 1 cooling
  • 4 heating + 1 cooling
• Working Width: 1800–3400 mm
• Steam Consumption:
  • 93–111 kg/h (4-cylinder, 2600 mm)
  • 129–147 kg/h (5-cylinder, 2600 mm)
• Electricity Use: 2.8 kWh

Technical Specifications

• Production Capacity: 2.5–3.5 tons/day
• Fabric Types: Woven and Knitted (CO, VIS, Elastane blends)
• Fabric Weight: Avg. 250 g/m²
• Working Width: 1800–3400 mm
• Cylinder Diameters: 630/800 mm
• Total Cylinders: 4 or more (with full Teflon coating)
• Cylinder Face Length: 2000–3600 mm
• Working Pressure: 5 Kg/cm²
• Hydraulic Test Pressure: 9 Kg/cm²
• Mechanical Speed: Up to 80 m/min
• Installed Power: 3–8 kW
• Power Usage: Approx. 65% of installed power
• Compressed Air Requirement: 6 bar