I. Equipment Introduction
The PET sheet extruder uses polyester chips (APET, RPET, PETG) as raw material. Through a continuous process of crystallization, drying, melting, extrusion, calendering, drawing, and winding, it produces transparent or colored rolls/sheets with thicknesses of 0.15–2 mm and widths of 600–2,000 mm. These rolls are widely used in food blister packaging, electronic trays, printing, and construction.
II. Workflow process
Raw Material Pretreatment System
• Twin-screw extruder: Aspect ratio of 30–36, zoned temperature control of 240–275°C, ensuring a melt viscosity window of 0.8–0.9 dL/g.
• Dual-station hydraulic screen changer + metering pump: Stabilizes pressure and improves transverse thickness uniformity.
Forming and Cooling
• Coat-hanger T-die with a flexible die lip adjustment of ±0.02 mm; the die is approximately 8 cm from the three rollers to prevent sheet sagging and wrinkling. • Oblique three-roll calender: Mirror chrome plating (Ra ≤ 0.015 μm). Roller temperature is controlled in stages from 30–70°C, enabling rapid cooling of PET to an amorphous state (APET) while maintaining high transparency.
Thickness measurement - draw-off - trimming - winding
• Online beta-ray or X-ray thickness measurement → Closed-loop adjustment of die lip bolts;
• Servo draw-off with closed-loop tension;
• Disc trimmer with online waste edge crushing and recovery;
• Dual-station friction winder with automatic metering and constant tension, capable of winding up to 1200 mm in diameter.
If you are interested, please contact us.
WhatsApp: +86 18765282806
Email: cami@xinruisuji.com
