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Recycled plastic pellets leaving the die face of a SUHUI pelletizing line
Knowledge base

Plastic Recycling & Extrusion Technology

Plastic recycling technology explained at the level an engineer specifying a line actually needs — screw geometry and twin-screw compounding, friction washing and float-sink separation, melt filtration, pelletizing methods and downstream vacuum calibration. Each article goes into the process decisions that change output quality, pellet consistency and running cost, rather than describing what a machine looks like. Understanding the plastic recycling technology behind a route is what makes a quotation comparable; if you are still choosing between routes, start from the plastic recycling machine guide or the plastic extrusion machine guide.

Recycling machine guide Extrusion machine guide
16 Guides & explainers PET / HDPE / PP / PVC Materials covered 20+ Years of line-building experience
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17 Aug
Technology | SUHUI Machinery

How an Extrusion Die and Barrel Shape the Final Product

An extrusion die distributes melt and gives it a cross-section, but it cannot correct melt that arrives at the wrong temperature, pressure or homogeneity. This guide covers the die families used for pipe, profile and cable coating, why land length is a trade-off between output and dimensional stability, how screw and barrel wear shows up at the die, what actually drives die cost, and how to read a defect back to its origin.

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17 Aug
Technology | SUHUI Machinery

How Plastic Extrusion Works From Pellet to Profile

Plastic extrusion is a continuous process that melts polymer and pushes it through a shaped die to make products of constant cross-section. This guide walks the six stages of an extrusion line, explains what the barrel does between feed throat and die, why sizing and cooling exist at all, how extrusion differs from injection molding, and what changes when the feed is recycled material rather than virgin pellets.

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16 Aug
Technology | SUHUI Machinery

Types of Plastic Extruders and Which Suits Your Material

Industrial plastic extruders come in three families — single screw, conical twin screw and parallel twin screw — and the polymer decides which one before output does. This guide covers what separates an industrial extruder from a 3D printer extruder, how to read the two numbers in a model code, how screw diameter maps to output and pipe size, why recycling lines configure the machine differently, and what to confirm before signing.

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16 Aug
Technology | SUHUI Machinery

What Is an Extruder and How Does It Work

An extruder melts plastic and pushes it through a die, but what comes out depends on the die and the equipment behind it. This guide covers the three screw zones, the main parts, the types of extruders, and why a recycling extruder and a pipe extruder are built for opposite problems even when both run the same material.

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What are PET flakes blog cover showing washed PET bottle flakes and an industrial PET recycling washing line 06 Aug
Technology | SUHUI Machinery

What Are PET Flakes and How Are They Graded

PET flakes stop being waste and become a traded commodity about two thirds of the way through recycling, with a price per tonne and a specification sheet attached. This guide covers what is on that sheet, which numbers the recycling line produces and which the buyer's contract sets, which stage of a washing line locks in each one, and how to check a lot before you sign for it.

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Friction washer blog cover for cleaning plastic flakes in a plastic recycling washing line 03 Aug
Technology | SUHUI Machinery

How a Friction Washer Cleans Plastic Flakes

A friction washer is the mechanical scrubbing stage in a plastic washing line. This guide covers what it removes from the flake surface, how its job splits with the hot caustic tank and the rinse tank, why its position in the sequence changes between film and bottle streams, and what it cannot fix at any setting.

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Find a Guide by Material

Jump straight to the articles that cover the polymer you actually run.

PET Bottles, flakes and fibre-grade scrap
What Is PET Plastic? Uses, Recycling, rPET and PET Bottle Processing PET Bottle Recycling Machine: Process, Equipment & Buyer Tips
HDPE Milk bottles, jerry cans, rigid scrap and pipe
HDPE Recycling Machine: Process, Equipment & Buyer Tips Plastic Pipe Recycling Process for HDPE, PVC and PP Scrap
PP / PE film Agricultural film, packaging film and woven bags
Plastic Film Recycling Line: 10-Step Process & Equipment How to Choose a Plastic Film Washing Line: Capacity, Stages & Cost
PVC Pipe, profile and compounding scrap
PVCO Pipe Guide: PVC-O Benefits, Uses and Manufacturing Process Plastic Profile Extrusion: Process, Materials and Line Configuration How a Twin Screw Extruder Works in PVC and Recycling Lines
Mixed & general Whole-line process, shredding and pelletizing
What Plastics Can Be Recycled? Plastic Numbers, Materials and Recycling Methods Plastic Recycling Lines Explained: Washing, Shredding, Pelletizing and Turnkey Systems Industrial Plastic Shredder: 4 Types & How to Choose How Plastic Pellets Are Made from Flakes, Regrind and Film Scrap

Browse by Topic

Done reading? Jump from theory to the equipment itself.

Equipment guide Plastic Recycling Machines Shredding, washing and pelletizing lines matched to your material. Equipment guide Plastic Extrusion Machines Pipe, profile and drinking-straw lines built around your product. Proof Case Studies Delivered lines by country, material and output. Catalogue All Machines Every SUHUI machine by production role.

Not Sure Which Line Fits Your Material?

Send us the plastic you run and the output you need. A SUHUI engineer will map a line configuration and a budget range — no catalogue spam.

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