SevenStars — Plastic Granulator & Pelletizing Systems That Turn Scrap into Reliable Raw Material

Chen Nathan
Jun 3, 2024
5 min read

Updated: Sep 25

SevenStars is a China-based manufacturer of industrial plastic granulator and plastic pelletizer machinery, complete pelletizing production lines, and turnkey plant systems. We manufacture equipment and engineer processes that convert a wide range of scrap plastic into uniform pellets — plastic particles that serve as plastic raw material for extrusion, injection molding, masterbatch making, WPC production, and more. This page explains what these machines are, how a pelletizing plant works, typical feedstocks, cost drivers, and the exact three-step route to get a tested quote and sample trial.

What is a plastic granulator and a pelletizer?

A plastic granulator reduces bulk or bulky scrap into smaller flakes or pieces suitable for downstream processing. A plastic pelletizer (pelletizing system) melts, filters and cuts polymer into uniform pellets ready for use as raw material. Pelletizing methods include extrusion pelletizing (strand cutting), underwater pelletizing, and die-face cutting. Together these machines form the heart of any plastic recycling pelletizing plant.

Why a clear “what is” and “how it works” explanation matters

Buyers search first for understanding. A clear definition plus a concise process explanation answers common questions—what the machine does, which polymers it handles, and what the output looks like—so procurement teams can evaluate feasibility quickly. That clarity leads to faster, higher-quality inquiries.

How a practical pelletizing production line works — step-by-step

A reliable production line / plant / system follows these stages:

Sorting & Pre-Shredding Separate by polymer type and remove large contaminants. Industrial granulators reduce scrap plastic and scrap plastic film into consistent flakes.
Washing & Separation Friction washers, hot wash tanks, and float-sink separation remove adhesives, labels and heavy contaminants—vital for dirt-prone feedstock like waste plastic bags, woven bags, waste plastic film, and agricultural film.
Drying & Pre-Conditioning Centrifugal or thermal dryers prepare the material for stable extrusion feed.
Extrusion & Melt Filtration Single- or twin-screw extruders perform melt filtration and vacuum degassing. This stage is critical for high-quality masterbatch and PVC pelletizer outputs.
Pelletizing Use extrusion pelletizing, underwater pelletizing or die-face pelletizing according to the material and final pellet spec. The right method affects pellet roundness, bulk density and downstream performance.
Cooling, Screening & Packaging Pellets are cooled, screened to size, dried if needed, and packed as saleable plastic raw material.

These integrated modules can be supplied as standalone machinery or packaged into a complete turnkey project with factory layout, water treatment and commissioning included.

Feedstocks and typical applications

Our systems process nearly all common polymer streams:

Flexible films and bags: HDPE PP film, waste plastic bags, woven bags, and agricultural film.
Bottles and rigid scrap: PET, PC, ABS, EPS.
Special streams: ELV, WEEE, WPC and mixed Scrap Plastic.
Cable streams: cable granulation to reclaim polymer from insulation.

Finished plastic particles and pellets are used for film extrusion, pipe and profile extrusion, injection molded parts, masterbatch production, and wood-plastic composite boards.

Price, cost and manufacturing considerations — what really matters

When planning a plant, buyers must evaluate:

Price vs Total Cost of Ownership (TCO): Equipment price is only part of the story. Operating cost (energy, water, labor) and yield determine real manufacturing cost per ton.
Feedstock condition: Films and contaminated wastes demand robust washing and water treatment, raising OPEX.
Capacity: Higher throughput (kg/hr or tons/day) reduces unit cost but raises initial investment for the production line.
Automation and controls: PLC-managed systems cost more but decrease labor and increase uptime.
Manufacturer credibility: Choose a manufacturer with in-house manufacturing capabilities, export experience, spare parts availability and an itemized price breakdown.

As a China manufacturer, SevenStars offers competitive price points and transparent manufacturing detail so you can model ROI with confidence.

Buyer-first conversion elements we provide

To remove uncertainty and speed decisions, professional offers include:

Sample trial: We process a small batch of your feedstock and deliver pellet photos and lab metrics (moisture, density, MFI).
Itemized quote: Detailed equipment list, manufacturing price, installation, spare parts and optional water treatment.
Lead-time guarantee: Written production and delivery timeline tied to contract milestones.
ROI snapshot: Months-to-payback calculation based on local pellet price and expected yield.
Pilot discount and prioritized commissioning for qualifying projects.

These deliverables turn curiosity into contracts.

Simple ROI calculator (use now)

Daily throughput (kg/day) × yield (%) × 365 ÷ 1000 = tons/year
Annual revenue = tons/year × local pellet price ($/ton)
Payback months = Total project cost ÷ (Annual revenue ÷ 12)

Send your numbers and we will run this for you.

Frequently asked questions (short & real)

Q: Can a pelletizing line handle mixed film and woven bags?A: Yes, but mixed feeds need stronger washing and float-sink separation to reach good pellet quality and yield.

Q: Which pelletizer is best for PVC?A: PVC lines commonly use specialized extruders and melt filtration; a dedicated PVC pelletizer configuration is recommended.

Q: What materials can be processed?A: PET, PVC, PP, PE, HDPE, LDPE, EVA, PC, ABS, ELV, EPS, WPC, WEEE and various Scrap Plastic streams.

How to get a real, no-nonsense quote — three simple steps

Send feedstock visuals: three photos or a 30–60s video of your scrap (top, side, close-up).
Tell us capacity: desired throughput in kg/hr or tons/day.
Specify pellet use: target pellet size and application (film, injection, masterbatch, WPC).

We will return an itemized equipment list, an estimated price range, expected yield assumptions, a sample-trial offer, and a lead-time commitment — usually within one business day.

Practical guarantees that reduce buyer risk

When you move forward with SevenStars you get:

Sample verification before purchase.
Written lead-time and commissioning schedule.
Starter spare parts kit for first-run stability.
Pilot discount for qualifying orders.

Final, realistic call to action

No marketing fluff. If you want transparent price, tested pellet quality, and a clear timeline to start production, start here: send feedstock photos, your capacity target, and the intended pellet application. We will return a tested sample option, an itemized quote, and a realistic payback snapshot — fast. That’s how real pelletizing projects become profitable businesses.

SevenStars Granulation technology

SEVENSTARS builds Pelleting lines suitable for production of granules for subsequent moulding, extrusion or calendering, starting from virgin or recycled material.

Suitable Pellets: PVC/PET/PP/PE/HDPE/LDPE/PC/EVA/EPS/WPC/ABS etc.

These lines are fully customisable and highly efficient at any production output, thanks to the innovative extruders of the SS Plus line and the wide range of SEVENSTARS modular accessories for every kind of application.

Ease of use and time saving for maintenance and cleaning are always our goals in the study and design of our granulation lines.

Features:

Coloured and transparent

Granules for rigid and flexible profiles

Granules for the medical field

Granules from recovery of recycled material

Granules for industrial products

Granules for wpc