Amstar provides pelletizing lines for different types of plastics. This guide shows which line fits which material—single-screw, two-stage single-screw, or twin-screw—along with key points like mixing, degassing, and filtration.
What line should I use for my material?
Quick selector (save/share friendly). “Why this choice” reflects industry-verified behavior: single-screws are simpler and cost-effective for clean, simple melts; twin-screws deliver superior mixing/degassing for complex recipes and unstable feeds.
| Material / Feed | Recommended Amstar Line | Core options | Why this choice |
| Clean PP/PE films & bags (washed, low ash) | Two-stage single-screw (with densifier/compactor + water-ring) | Double vacuum vents; double filtration; VFD dosing; water-ring pelletizer | Two-stage stabilizes volatile removal and filters fines from thin films for consistent pellets at modest CAPEX. |
| Washed rigid HDPE/PP flakes (crates, caps) | Two-stage single-screw (strand or water-ring) | Side feeder; melt pump; strand bath + air knife or water-ring | Rigid flakes run well on single-screw if clean/dry; two-stage improves stability when fines/moisture vary. |
| PET flakes (PET) | Twin-screw (with dual-zone vacuum) or specialized single-screw with deep vacuum; strand or underwater | Dual vacuum; fine filtration; IV control strategy | PET is sensitive to moisture and IV; robust degassing and tight temperature control are mandatory for stable pellet quality. |
| Woven bags / film regrind (medium contamination) | Two-stage single-screw (compactor + double vent) | Double filtration; large screen area; water-ring | Extra filtration/venting smooths out gels/volatiles; compactor gives steady feed for light, fluffy films. |
| Masterbatch / high-filler compounds(CaCO₃, glass fiber, additives) | Co-rotating twin-screw (side feeders + modular kneading blocks) | Melt pump; side-feed solids/liquids; water-ring/underwater | Twin-screw’s intermeshing design gives stronger mixing/dispersion and independent control of throughput vs. screw speed. |
| Elastomers/TPU/TPV | Co-rotating twin-screw + underwater pelletizing | Tight temp windows; underwater die-face | Underwater cuts sticky melts cleanly; twin-screw handles shear/temperature precisely for uniform pellets. |
| PVC regrind | Twin-screw (counter or co-rotating)with de-HCl strategy | Venting; corrosion-resistant metallurgy; die-face cutting + air cooling | PVC needs strong venting and gentle thermal profile; twin-screw hardware/configurations address both. |
Featured Videos — See Amstar Pelletizing in Action
- PP/HDPE Pelletizing Line with Laser Filter System
Watch how our pelletizing line with a laser filter system ensures clean, high-quality pellets even with tough contaminants
- PP, PE and HDPE Regrind Pelletizing Line (Charlotte, USA)
Discover how Amstar’s regrind pelletizing line transforms PP, PE, and HDPE flakes into uniform pellets in Charlotte, USA
- BOPP Plastic Film Pelletizing Line (Halifax, UK)
See the full recycling process of BOPP film waste turned into new pellets in Halifax, United Kingdom
- PP/PE PlasticPP/PE Plastic Film Pelletizing Line (Auburn, USA)
Watch how Amstar’s two-stage pelletizing line processes PP/PE films with stable feeding and glossy pellets in Auburn, USA
- PET Flakes Pelletizing Line (Malaysia)
See the twin-screw pelletizing line in action processing PET bottle flakes in Malaysia
Why Choose Amstar
- One-stop solution: From films and woven bags to PET flakes, masterbatch, and PVC—Amstar covers it all.
- Stable and efficient: Every line is built with real-world recycling in mind, with reliable degassing, steady feeding, and efficient pelletizing.
- Customizable: Capacity from 50 kg/h to 1,500 kg/h. Water-ring, strand, or underwater pelletizing—choose what fits your product best.
- Trusted worldwide: Amstar lines are running in more than 60 countries, helping recyclers and compounders turn waste into value.
Your Next Step
Not sure which line is best for you? Just tell us:
- What material you process
- How clean it is
- Your target output (kg/h)
We’ll send you a tailored proposal with capacity, specs, and pricing—clear and fast.
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