Engineering Plastic Blending and Modification Equipment

The CJWH series is widely used in the following compounding lines:

Glass fiber/carbon fiber reinforced plastics
Case: A German Tier 1 automotive supplier uses the CJWH75 to produce 30% GF reinforced PA66 for engine covers. At an L/D ratio of 44:1 and a screw speed of 750 rpm, they achieved a stable output of 850 kg/h with back pressure, and fiber length retention above 85%.

Flame retardant compounds
Case: A South Korean electronic materials manufacturer adopted the CJWH65 to produce halogenfree flame retardant PC/ABS blends. The longer 48:1 L/D allows five sidefeeding zones to precisely add red phosphorus and magnesium hydroxide, achieving UL94 V0 at 1.6 mm thickness with annual screw wear below 2%.

Toughening modification
Case: A Chinese recycler used the CJWH95 to process postconsumer ABS waste with POEgMAH toughener. At 480 rpm (low shear to avoid degradation) and 48:1 L/D, they processed at 1,350 kg/h while increasing the notched Izod impact strength from 12 kJ/m² to 38 kJ/m².

Color masterbatch & filler compounding
Case: A Middle Eastern masterbatch producer uses the CJWH75 to produce 70% calcium carbonate filled PP. The 36:1 L/D and highspeed configuration at 900 rpm achieved an output of 1,000 kg/h with excellent dispersion (fine particles <50 µm).

2.1 High Free Volume & L/D Flexibility
L/D ratios from 36 to 48 mean more side feeders and vent sections can be added. For heat-sensitive engineering plastics (e.g., PBT), the longer barrel allows gentle melt sealing and deep devolatilization without thermal degradation. 

2.2 Wide Screw Speed Range (400–900 rpm)
Low speed (400–550 rpm): suitable for shear-sensitive materials such as TPU or thermoplastic elastomers.
High speed (700–900 rpm): maximizes dispersion of nano-clays or carbon nanotubes.
The CJWH95 achieves a specific torque of 12.5 Nm/cm³ at 900 rpm, outperforming many European machines at the same price level.

2.3 Modular Screw Elements
All models are compatible with standard screw elements of 56 mm outer diameter. You can recombine kneading blocks, reverse elements, and mixing teeth within 2 hours – a major advantage for R&D labs that frequently change formulations.

2.4 Energy Efficiency
At 80% load, the CJWH series consumes 0.12–0.18 kWh per kg of compound (depending on filler content). For a CJWH75 running at 800 kg/h, this saves about 15% energy compared to conventional hydraulic twin-screw designs.

We implement a four-stage quality control process to ensure every machine meets engineering plastics compounding standards.

Stage A – Component inspection
Screw shafts: 100% magnetic particle inspection to detect micro-cracks.
Barrel liners: Hardness check (HRC 58–62) and wear test using alumina slurry.
Heating/cooling zones: Thermal imaging verifies temperature uniformity within ±1°C.

Stage B – No-load run & vibration test
Each assembled machine runs for 2 hours at 900 rpm without load. Vibration sensors ensure displacement below 1.2 mm/s (ISO 10816-3 Class II acceptable limit).

Stage C – On-site material testing (customer formulation)
We dispatch process engineers with portable data loggers. Example: processing 40% talc-filled PP on a CJWH65:
Measure melt temperature gradient (temperature difference from zone 5 to die <5°C)
Take samples every 15 minutes – check filler dispersion via optical microscopy (target >95% agglomerates <100 µm)
Record torque stability for 4 hours – coefficient of variation <3%

Stage D – Long-term validation
For large orders, we perform a 72-hour continuous production test at rated capacity. Samples are taken every 4 hours and tested for:
Melt flow index (MFI) deviation ≤5%
Tensile strength / elongation at break (ASTM D638)
Color difference (ΔE <0.5 for white masterbatch)
Real QC result: A CJWH95 delivered to a Brazilian automotive compounding plant passed a 48-hour trial producing 50% GF-PPS at 1,420 kg/h. No screw element breakage, and 100% of production lots met the ISO 178 flexural modulus requirement of 18.5 GPa.

Product Parameters：

Q1: How to choose between CJWH65, CJWH75 and CJWH95?
A: Based on your target output and available floor space.
CJWH65 (300–800 kg/h) – lab scale to small batch production; footprint 6×2 m.
CJWH75 (500–1000 kg/h) – regular production for automotive/electronics.
CJWH95 (800–1500 kg/h) – high-volume compounding; requires 9×2.5 m space.
Additionally, if your formulation contains >40% glass fiber or >30% mineral filler, the larger free volume of the CJWH95 reduces fiber breakage by 10–15%.

Q2: Can the same frame accommodate both 36 L/D and 48 L/D?
A: Yes. The barrel sections are stackable. You can start with 36 L/D and later upgrade to 48 L/D by adding two barrel sections (4D each). Many customers do this when moving from simple filling to reactive extrusion (e.g., chain extension for recycled PET).

Q3: How often do the screws need to be refurbished?
A: For regular glass-filled compounds (≤30% GF), expect noticeable thread wear after 4,000–5,000 operating hours. For highly abrasive fillers (ceramics, carbon fiber), we recommend inspection every 2,000 hours. Our CJWH series uses bimetallic barrels (Ni-Cr-B alloy, 2.5 mm thick), which typically last longer than the screw elements.

Q4: What is the maximum allowable torque at 900 rpm?
A:
CJWH65: 1,350 Nm
CJWH75: 2,200 Nm
CJWH95: 3,800 Nm
These values are for continuous safe operation. The drive motor is IP54 rated with forced air cooling.

Q5: Can you provide screw configurations for reactive extrusion (e.g., PLA grafting)?
A: Absolutely. For reactive modification, we recommend 48 L/D with longer conveying sections, two sets of 45° kneading blocks, and a liquid injection port for monomers and peroxides. We have supplied such a configuration to a bioplastics lab in the Netherlands – they achieved 92% grafting efficiency for maleic anhydride grafted PLA.

Q6: How does the CJWH series handle high-temperature engineering plastics (e.g., PEEK, 400°C)?
A: Standard configuration heats up to 350°C. For PEEK or PEI (450°C), we offer a high-temperature upgrade: Inconel screw shafts, ceramic heaters, and water-cooled feed throat. A CJWH65 with this upgrade is currently producing 30% CF-PEEK for aerospace components at 120 kg/h.