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China
LC, T/T
CE, ISO, UL, QS, GMP
1 Year
1-3 months
Product Description
JWT series PET bottle flake single screw pelletizing line is mainly used to produce high quality yarn spinning grade PET pellets, etc. Equipped with a dehumidification and crystallization drying system, the screw adopts a special LTM low-temperature mixing element, the host adopts an energy-saving insulation cover structure, and is equipped with a booster pump system and a double-stage double-cyinder melt fiter to ensure the uniformity of the temperature of the material. Improve the purity of the material; the granulation line can effectively control the B value and L value and the viscosity drops to the lowest.
型号 Model | 长径比 L/D | 转速(rpm) Speed | 产量(kg/h) Capacity |
JWT130
| 30 | 20-80 | 250-350
|
JWT160
| 30 | 20-80 | 450-600
|
JWT190
| 30 | 20-80 | 800-1200 |
High-quality nitride or bimetallic screws (often W6Mo5Cr4V2A alloy or similar) with barrier flights or mixing sections. These ensure gentle melting, minimal shear degradation, and good homogenization without excessive IV loss.
Many have L/D ratios of 30–36:1 — long enough for proper plasticization and venting.
This is crucial for PET. Single or double vacuum vents (often <1 mbar) remove moisture and volatiles right in the melt. Good lines keep IV drop to 3–8% even without pre-crystallization drying in some designs.
PET flakes are light and can bridge. Force feeders or compactor-style feeders push material steadily into the screw, preventing starvation and surges.
Automatic or hydraulic screen changers (mesh 40–120 μm) remove paper labels, aluminum bits, or unmelted contaminants. Stable single-screw pressure helps push melt through fine screens without fluctuations.
· Strand pelletizing (classic for PET): melt extruded into water bath → cooled → dried → cut. Reliable and common.
· Water-ring pelletizing: faster cooling, rounder pellets, less dust — increasingly popular for PET.
· Underwater pelletizing: very uniform, good for higher outputs.
Self-adjusting cutters and auto RPM control keep pellet size consistent (usually 3–5 mm or customizable).
IE3 motors + VFDs, zoned barrel heating, and optimized screw geometry cut power use. Many lines achieve 0.25–0.45 kWh/kg — competitive for single-screw PET processing.
Bimetallic or special alloy barrels handle PET's slight abrasiveness (from TiO2 or residues). Good ones last 2–5 years heavy-duty before major refurb.
Modern lines feature recipe storage, real-time monitoring of pressure/temperature/screw speed, and alarms. Some allow remote diagnostics.
Advanced single-screw lines pair with agglomerators or built-in pre-heating to crystallize and dry flakes on-the-fly, reducing or eliminating separate dryers and saving energy.
Single-screw isn't always "worse" — it's often smarter for certain PET jobs.
· Lower Purchase & Operating Cost — 30–60% cheaper than equivalent twin-screw.
· Simpler Structure & Easier Maintenance — Fewer parts, faster cleaning, less downtime.
· Excellent Pressure Stability — Great for consistent filtration and die flow → uniform pellets.
· Lower Shear & Gentler on PET — Less IV drop in some clean-flake scenarios.
· Mature Technology — Widely available spare parts, proven long-term reliability.
Best fit: pre-washed, pre-dried, sorted PET bottle flakes with moderate contamination.
FAQ
Who We Are?
Jwell Machinery is a leading Chinese manufacturer specializing in the production of extrusion machinery, particularly for the plastic processing industry. Founded in 1997, Jwell has become one of the largest and most well-known manufacturers of plastic extrusion equipment in China and is recognized globally for its high-quality products.
