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Recycled plastic pellets leaving the die face of a SUHUI pelletizing line
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Plastic Recycling Industry Blog

Buyer's guides, process explainers and industry news for anyone specifying plastic recycling and extrusion equipment — how shredders, washing lines and pelletizing lines are configured around a given feedstock, and which plastics can realistically be recycled at scale.

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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18 Aug
Technology | SUHUI Machinery

What Extruded Plastic Profiles Are and How They Are Made

Extruded plastic profiles are continuous lengths of thermoplastic with a fixed non-round cross-section — window frames, cable trunking, channels, trims, seals and lamp diffusers. The process is identical to pipe extrusion and the engineering is not. This article covers why an asymmetric die has to be flow balanced by design, why the die opening is never the shape of the finished profile, why calibration is a series of plates rather than a single sleeve, what co-extrusion adds, and which section geometries are difficult to extrude.

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18 Aug
Technology | SUHUI Machinery

What Makes PVC Extrusion Different From PE and PP

PVC extrusion is treated as its own discipline because PVC degrades rather than simply softening when it is held hot. Its usable processing window is narrow, it needs stabilisers to survive the barrel, it arrives as a dry blend rather than as pellets, and it must be purged before shutdown. This guide works through what each of those facts does to the extruder, the flow path, the materials of construction and the shift routine, and what changes again when the feed is recycled PVC.

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18 Aug
Technology | SUHUI Machinery

How Pipe Extrusion Lines Are Configured Around the Diameter

A pipe extrusion line is configured around one number — the diameter range it has to cover. Diameter sets the melt volume the extruder must deliver, the cooling length the pipe needs before it can be gripped, and the traction the haul-off must apply without deforming a soft wall. This guide walks the eight stations in order, explains which station owns which pipe property, shows why two extruder series overlap in diameter, and covers when running several strands beats buying a bigger machine.

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17 Aug
Technology | SUHUI Machinery

How Screen Changers and Melt Filters Clean Recycled Melt

A screen changer holds the filter screens between the extruder barrel and the die and lets them be replaced without stopping the line. This guide separates the breaker plate from the screen pack, compares manual, slide plate, dual piston and continuous designs, explains how mesh is chosen against real contamination, why screens are changed on melt pressure rather than on a timer, and why melt filtration cannot rescue a feedstock the washing line did not clean.

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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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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

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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.

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