PP EVA EVOH EVA PP Multi-Layer Sheet Co-Extrusion Line

The extrusion lines are designed specifically for APET, PETG, and CPET – the three most common amorphous/crystallizable materials used in rigid packaging. Depending on the model, output can reach 400 kg/h to 1200 kg/h, sheet width 800–1050 mm, thickness 0.15 mm to 1.5 mm (the WS150-1300 model is typically set for 1.5 mm thick sheet).
Practical applications include:
APET sheet – transparent blister packaging for electronics, toys, and power tools; as well as food trays, clamshells, and fruit containers.
Case study: A Polish packaging converter uses the JWPS-1300 (up to 1200 kg/h) to produce 0.35 mm APET sheet for 500 g strawberry containers – daily output 28 tons.
PETG sheet – high-impact, chemical-resistant medical blister trays, surgical instrument packaging, and point-of-sale displays.
Case study: A Turkish medical supplier uses the JWBS-1300 (700–800 kg/h) to produce 0.5 mm PETG sheet for sterile drainage bag trays.
CPET sheet – crystallizable PET trays that withstand oven and microwave heating (up to 220°C). Used for frozen ready meals, airline catering, and dual-ovenable food containers.
Case study: A UK ready-meal producer uses the WS150-1300 (800–1000 kg/h) to extrude 1.5 mm CPET sheet, later thermoformed into black ovenable meal trays.
The line can also be configured for multi-layer co-extrusion (e.g., APET/PE sealing layer), but its core strength is high-output, single-layer or two-layer APET/PETG/CPET sheet production.

Real case: A Romanian thermoformer replaced an old 600 kg/h line with the JWPS-1300. Now they run 0.45 mm APET sheet continuously at 1100 kg/h – scrap rate dropped from 11% to 5.5% due to better melt uniformity.

We implement a 5-stage QC protocol – each stage documented, batch traceable.
Stage 1 – Incoming material inspection
Moisture content of PET raw material must be <50 ppm (Karl Fischer titration). APET/PETG is dried at 160–170°C for 4–6 hours before feeding.
Stage 2 – During extrusion (online monitoring)
Melt pressure and temperature (every 2 seconds) – automatic screw speed adjustment if deviation exceeds ±3%.
Thickness control – β-ray or NIR scanner across 1050 mm width. Thickness tolerance: ±0.015 mm for sheet ≤0.5 mm; ±0.025 mm for sheet >0.5 mm.
Stage 3 – Haul-off & winding inspection
Surface optical inspection – online camera detects gels, black spots, or fish eyes (medical grade standard: max 3 black spots/m²).
Width shrinkage – measured every 2 hours. Acceptable range: ≤1.5% after 24 hours at 23°C.
Stage 4 – Laboratory testing (every 500 kg produced)

Stage 5 – Final roll release
Each roll (max width 1050 mm, max OD 800 mm) is labeled with batch number, thickness profile chart, and QC stamp.
For CPET sheet, crystallinity test (DSC) is performed to ensure 25–35% crystallinity – critical for ovenable performance.
Real case: During a 48-hour trial for a German pharmaceutical customer, the JWPS-1000 produced PETG sheet at 400 kg/h. Lab samples taken every 2 hours passed IV and haze limits, and the online scanner showed 99.7% of thickness points within ±0.01 mm of target.

Q1: Can the same line produce APET, PETG, and CPET without changing the screw?
A: Yes – the JWPS series screw is designed for all amorphous and crystallizable PET grades. However, when switching from APET to CPET, you must:
Increase die temperature from 260°C to 280°C.
Increase cooling roll temperature from 40°C (APET) to 90–110°C (to induce crystallization).
Use faster winding haul-off speed to prevent sticking to rolls.

Q2: Why is my sheet thickness uneven (center thicker than edges)?
A: Common causes:
Die lip gap not adjusted for 1050 mm width – use the 20-bolt die adjustment system for "profile tuning".
Melt temperature too low (<250°C) causing higher viscosity at the edges.
Solution: Raise all heating zones by 5–10°C and increase adapter flange temperature.
Dirty die lip – clean every two shifts with a copper scraper.

Q3: What is the maximum line speed for 0.2 mm APET sheet on JWPS-1300?
A: At 1000 kg/h and 1050 mm width, line speed =1000 (kg/h) / (0.2 mm × 1050 mm × 1.27 g/cm³ density × 3.6) ≈ 104 m/min.
Our gearbox and winder support up to 120 m/min, so 104 m/min is safe.

Q4: How to avoid black spots when producing CPET?
A: CPET requires higher melt temperature (275–285°C). Degraded resin sticking to screw flights causes black spots.
Preventive measures:
Use a screw with chrome-plated barrier flights (standard on JWPS-1300).
Purge every 8 hours with PETG or low-IV APET.
Perform a "high-temperature purge" at 290°C for 30 minutes once a week.

Q5: What is the typical scrap rate for 0.5 mm PETG on JWBS-1300?
A: Under normal production (after 2-hour warm-up), scrap rate is 4–6% – mainly from edge trim (3%) and start-up transition sheet. Many customers regrind this waste for use in the core layer of co-extruded sheet (up to 30% regrind allowed).

Q6: Can I produce anti-static or UV-resistant sheet?
A: Yes – add 2–4% functional masterbatch in the main hopper. The JWPS series screw has a mixing section to disperse additives evenly. For high transparency requirements, a liquid additive injection system (optional) is available.