Plastic Pulverizer vs Granulator vs Shredder: Which Machine Do You Need?

Choosing between a plastic pulverizer, granulator, and shredder can be confusing because all three machines reduce the size of plastic materials.

However, they are designed for very different jobs.

A shredder reduces large and bulky plastic waste into coarse pieces.

A granulator cuts smaller plastic scrap into relatively uniform flakes or regrind.

A plastic pulverizer takes the process one step further by grinding plastic granules or flakes into fine powder.

The right machine therefore depends on three questions:

1. What plastic material are you processing?

2. What size is the material before processing?

3. What particle size do you need at the end?

This guide explains the differences between plastic pulverizers, granulators, and shredders and helps you determine which machine—or combination of machines—is suitable for your production line.

Quick Answer: Pulverizer vs Granulator vs Shredder

The simplest way to understand the difference is:

Shredder = Bulky Plastic → Coarse Pieces

Granulator = Plastic Scrap → Uniform Regrind

Pulverizer = Plastic Granules → Fine Powder

Here is a quick comparison.

The actual output size depends on the machine design, screen configuration, plastic material, and production requirements.

What Is a Plastic Shredder?

A plastic shredder is usually the first stage of size reduction.

It is designed to process large, bulky, thick, or difficult-to-feed plastic materials that cannot be fed directly into a granulator or pulverizer.

Plastic shredders generally operate at relatively low speed with high torque.

Instead of trying to create a fine final product, the shredder's job is to make oversized plastic manageable for the next processing stage.

Typical Materials for Plastic Shredders

Plastic shredders are commonly used for:

• Large HDPE pipes

• Plastic drums

• Plastic pallets

• Plastic crates

• Large injection-molded parts

• Thick plastic sheets

• Purging blocks

• Plastic bales

• Large production waste

• Irregular plastic scrap

Typical Shredder Output

The output is usually relatively coarse and may still require further processing.

A shredder is therefore often followed by:

Shredder → Granulator

or:

Shredder → Granulator / Crusher → Pulverizer

depending on the required final material size.

What Is a Plastic Granulator?

A plastic granulator is designed to produce smaller and more uniform plastic regrind.

Compared with a shredder, a granulator generally operates at higher speed and uses rotating knives, fixed knives, and a sizing screen.

Material remains in the cutting chamber until it becomes small enough to pass through the screen.

Typical Materials for Plastic Granulators

Granulators are commonly used for:

• Injection molding runners

• Sprues

• Defective molded parts

• Plastic bottles

• Pre-shredded pipe

• Plastic sheet scrap

• Production offcuts

• Small rigid plastic parts

• Plastic flakes

Typical Granulator Output

Granulators normally produce material in the millimeter range, often suitable for:

• Washing

• Extrusion

• Pelletizing

• Injection molding reuse

• Compounding

• Further pulverizing

The result is commonly called:

• Regrind

• Flake

• Granulate

• Ground plastic

The exact terminology varies by market.

What Is a Plastic Pulverizer?

A plastic pulverizer is a fine-grinding machine designed to convert plastic granules, flakes, or crushed materials into fine plastic powder.

It is normally used after the material has already been reduced to a manageable feed size.

Unlike a shredder or granulator, a pulverizer focuses on:

• Powder fineness

• Particle-size consistency

• Grinding temperature

• Grinding disc clearance

• Airflow

• Classification

• Screening

Maoyue plastic pulverizer machines can be configured for approximately 20–200 mesh powder, depending on the material and production requirements.

Typical Materials for Plastic Pulverizers

Plastic pulverizers can be used for materials such as:

• PVC

• PE

• HDPE

• LDPE

• LLDPE

• PP

• EVA

• ABS

• PET

• Masterbatch

• Plastic compounds

• Recycled plastics

Different polymers require different grinding configurations and temperature-control strategies.

What Is Plastic Powder Used For?

A pulverizer is necessary when the downstream process requires powder instead of flakes or granules.

Common applications include:

Rotomolding Powder Production

LLDPE and HDPE are pulverized into powder for rotational molding products such as:

• Water tanks

• Road barriers

• Kayaks

• Containers

• Outdoor furniture

PVC Recycling

PVC pipes, profiles, sheets, boards, and SPC flooring scrap can be crushed and pulverized into reusable PVC powder.

Masterbatch Processing

Pulverized materials can be used in:

• Color masterbatch

• Filler masterbatch

• Plastic compounding

• Additive processing

Engineering Plastics

ABS, EVA, PET, and other materials may also require controlled powder processing depending on the application.

Pulverizer vs Granulator: What Is the Main Difference?

The most important difference is the final particle size.

A granulator produces regrind.

A pulverizer produces powder.

For example:

Plastic Scrap → Granulator → 5–15 mm Regrind

versus:

Plastic Regrind → Pulverizer → 20–80 Mesh Powder

Exact sizes vary by machine and material, but the processing objective is fundamentally different.

When Should You Choose a Granulator?

Choose a granulator when:

• Your raw material is already relatively small

• You need reusable flakes or regrind

• The material will be pelletized

• The material will return to an extruder

• Powder is not required

When Should You Choose a Pulverizer?

Choose a pulverizer when:

• Your final product must be powder

• You need controlled mesh size

• You manufacture rotomolding powder

• You recycle PVC into powder

• You process masterbatch

• You need fine material for compounding

A pulverizer normally should not be fed with large bulky plastic parts directly.

The input material should first be reduced to the appropriate feed size.

Shredder vs Granulator: What Is the Main Difference?

Both machines reduce plastic size, but their roles are different.

A shredder is designed primarily to handle difficult input.

A granulator is designed primarily to control final regrind size.

Choose a Shredder When the Material Is:

• Large

• Heavy

• Bulky

• Thick

• Irregular

• Difficult to feed

For example:

• Complete pipes

• Large drums

• Pallets

• Purging

• Large molded products

Choose a Granulator When the Material Is:

• Already manageable in size

• Clean production scrap

• Small molded parts

• Pre-shredded plastic

• Bottles

• Runners and sprues

and you need more uniform output.

Plastic Pulverizer vs Shredder

A pulverizer and shredder operate at almost opposite ends of the size-reduction process.

The shredder handles the largest input.

The pulverizer produces the smallest output.

A typical process may therefore look like:

Large Plastic Scrap

↓

Shredder

↓

Coarse Plastic Pieces

↓

Granulator / Crusher

↓

Plastic Regrind

↓

Pulverizer

↓

Fine Plastic Powder

Trying to use one machine to perform all of these stages usually reduces efficiency and increases equipment wear.

Input and Output Size Comparison

Understanding particle size is one of the easiest ways to choose the correct equipment.

Typical industry values may roughly fall around:

Plastic Shredder

Often around:

20–100+ mm pieces

Plastic Granulator

Often around:

4–18 mm regrind

Plastic Pulverizer

Often around:

20–200 mesh powder

These are general reference ranges only.

Machine configuration and material characteristics determine actual results.

Which Machine Do You Need for Different Plastic Materials?

PVC Pipes

If you have complete or large-diameter PVC pipes:

Pipe Crusher / Shredder → Pulverizer

For smaller PVC pipe scrap:

Crusher → Pulverizer

Final application:

• Pipe extrusion

• Profile extrusion

• PVC recycling

PVC Profiles

Typical process:

Profile Scrap → Crusher → Pulverizer

Finished PVC powder can potentially be blended back into suitable production formulations.

SPC Flooring Scrap

Typical process:

SPC Flooring Scrap → Crusher → Pulverizer → Screening

Because SPC materials may contain a high proportion of mineral filler, grinding component wear and system configuration are particularly important.

LLDPE for Rotomolding

If the input is already PE pellets:

PE Granules → Pulverizer → Screening → Rotomolding Powder

A shredder or granulator may not be necessary.

For recycled rotomolding material:

Plastic Scrap → Shredder / Crusher → Granulator if required → Pulverizer

HDPE Drums and Containers

Large containers normally require initial size reduction.

Typical process:

HDPE Drum → Shredder → Granulator → Regrind

If the final product needs powder:

HDPE Drum → Shredder → Granulator → Pulverizer

Injection Molding Runners

If the goal is simply to return material to injection molding:

Runners → Granulator → Regrind

A pulverizer is normally unnecessary.

Color Masterbatch

When the material must be reduced into fine powder:

Masterbatch Pellets → Pulverizer → Screening / Collection

Machine selection should consider material hardness, temperature behavior, and desired powder size.

Do You Need One Machine, Two Machines, or All Three?

Not every factory needs a shredder, granulator, and pulverizer.

The correct configuration depends on the difference between your starting material size and required final particle size.

Scenario 1: Only a Shredder

Use only a shredder if your goal is:

• Volume reduction

• Easier transport

• Preparing bulky scrap for sale

• Preparing material for another recycling facility

Scenario 2: Only a Granulator

Use only a granulator if:

• Input material is already small enough

• You need reusable regrind

• Powder is unnecessary

Typical example:

Injection Runners → Granulator → Reuse

Scenario 3: Only a Pulverizer

Use only a pulverizer when:

• Material already arrives as suitable granules

• Fine powder is the final objective

Typical example:

LLDPE Pellets → Pulverizer → Rotomolding Powder

Scenario 4: Shredder + Granulator

This is common when processing bulky waste into reusable flakes.

Example:

Plastic Pallets → Shredder → Granulator → Regrind

Scenario 5: Crusher / Granulator + Pulverizer

This configuration is very common for PVC recycling.

Example:

PVC Profile Scrap → Crusher → Pulverizer → PVC Powder

Scenario 6: Shredder + Granulator + Pulverizer

This configuration makes sense when:

• Raw material is extremely bulky

• Final product must be fine powder

• A stable continuous production line is required

Example:

Large Plastic Scrap

→ Shredding

→ Granulation

→ Pulverizing

→ Screening

→ Powder Collection

Each machine performs a different job rather than forcing one machine to perform several incompatible functions.

Which Machine Uses More Energy?

Energy consumption should not be compared only by motor power.

Different machines perform different levels of size reduction.

A shredder may have a powerful motor because it requires high torque.

A pulverizer can also consume significant energy because fine grinding requires high-speed operation.

The better metric is:

Energy Consumption per Ton of Acceptable Finished Material

For example:

A machine consuming less electricity per hour is not economical if it also produces much less usable material.

When comparing suppliers, ask for:

• Total installed power

• Real production capacity

• Required particle size

• Material type

• Operating temperature

• Blade / disc service life

Then estimate:

kWh per ton of finished product

Which Machine Has the Highest Wear Cost?

Wear parts differ between machines.

Shredder Wear Parts

Common components include:

• Rotor cutters

• Counter knives

• Screens

• Bearings

Granulator Wear Parts

Common components include:

• Rotor knives

• Fixed knives

• Screens

• Belts

• Bearings

Pulverizer Wear Parts

Common components include:

• Pulverizer segment blades

• Grinding discs

• Bearings

• Screens

• Seals

For pulverizers, grinding disc accuracy and blade condition have a direct effect on:

• Output

• Powder fineness

• Temperature

• Energy consumption

• Machine vibration

Therefore, spare-part quality should be considered when selecting a pulverizer supplier.

Pulverizer vs Granulator vs Shredder Cost: Which Is More Expensive?

There is no simple ranking because machine price depends heavily on:

• Capacity

• Rotor or disc size

• Motor power

• Machine structure

• Automation

• Feeding system

• Dust collection

• Cooling

• Material

• Brand

A large industrial shredder can cost significantly more than a compact pulverizer.

Likewise, a complete automated pulverizing system can cost more than a basic granulator.

Instead of asking:

Which machine is cheaper?

Ask:

Which process produces my required final material at the lowest cost per ton?

That is the more useful purchasing comparison.

7 Questions to Ask Before Choosing a Size Reduction Machine

Before contacting a machine manufacturer, prepare the following information.

1. What Material Are You Processing?

Examples:

• PVC

• HDPE

• LDPE

• LLDPE

• PP

• ABS

• PET

• EVA

• Masterbatch

2. What Does the Input Material Look Like?

Is it:

• Pipe?

• Sheet?

• Film?

• Drum?

• Pallet?

• Granules?

• Flakes?

• Runners?

• Production scrap?

3. What Is the Largest Input Size?

This determines whether pre-shredding or crushing is necessary.

4. What Final Particle Size Do You Need?

Do you require:

• Coarse pieces?

• 10 mm flakes?

• Regrind?

• 40 mesh powder?

• 80 mesh powder?

This question often determines the machine type immediately.

5. What Capacity Do You Need?

Specify:

kg/h or ton/hour

Do not select equipment only according to maximum theoretical capacity.

6. What Will Happen to the Material Next?

Will it go into:

• Washing?

• Extrusion?

• Pelletizing?

• Injection molding?

• Rotomolding?

• Masterbatch production?

• PVC extrusion?

The downstream process determines the appropriate output form.

7. Is the Material Virgin or Recycled?

Recycled material may contain:

• Metal

• Sand

• Wood

• Labels

• Dust

• Other contamination

A metal separator or additional pre-treatment may be necessary to protect the machine.

Common Buying Mistakes

Mistake 1: Buying a Shredder When You Need Powder

A shredder cannot replace a pulverizer.

Its output is far too coarse for applications such as rotomolding powder.

Mistake 2: Feeding Large Scrap Directly into a Pulverizer

Pulverizers are fine-grinding machines.

Oversized feed can reduce output, increase wear, cause unstable operation, and create temperature problems.

Mistake 3: Buying the Largest Machine Available

Higher capacity is not always better.

Oversized equipment can increase:

• Initial investment

• Electricity consumption

• Floor-space requirements

• Auxiliary equipment cost

Choose equipment based on real production demand.

Mistake 4: Comparing Machines Only by Motor Power

A larger motor does not automatically mean greater efficiency.

Compare:

kg/h + final particle size + kWh/ton

Mistake 5: Ignoring the Downstream Process

The goal is not simply to make plastic smaller.

The goal is to produce the material form required by the next production step.

How to Select the Right Machine: Simple Decision Guide

Use this rule:

Is your plastic large, bulky, thick, or difficult to feed?

Yes → Start with a Shredder

Is the material manageable but you need uniform flakes or regrind?

Yes → Choose a Granulator

Do you need fine plastic powder?

Yes → Choose a Pulverizer

Is your material both bulky and required as powder?

Yes → Use a Multi-Stage System

For example:

Shredder → Granulator / Crusher → Pulverizer

Where Does a Plastic Crusher Fit?

The terms plastic crusher, grinder, and granulator are sometimes used differently between manufacturers and countries.

Function is therefore more important than the product name.

In many PVC recycling lines, a plastic crusher performs the intermediate size-reduction role before the pulverizer.

For example:

PVC Sheet → Crusher → Pulverizer

or:

PVC Pipe → Pipe Crusher → Pulverizer

When evaluating equipment, focus on:

• Maximum feed size

• Cutting method

• Output particle size

• Screen size

• Capacity

• Downstream requirements

rather than terminology alone.

How Maoyue Designs a Plastic Pulverizing Line

For applications requiring fine plastic powder, Maoyue can configure pulverizing systems according to:

• Plastic material

• Input size

• Required mesh

• Required capacity

• Factory layout

• Automation level

A typical PVC crushing and pulverizing system may include:

Plastic Crusher

↓

Screw Conveyor

↓

Storage Hopper

↓

Controlled Feeding

↓

Metal Separation

↓

Plastic Pulverizer

↓

Cyclone Separation

↓

Vibrating Screen

↓

Powder Collection

Optional equipment may include:

• Vacuum loader

• Screw feeder

• Frequency converter

• Metal separator

• Chiller

• Pulse dust collector

• Automatic powder collection system

The objective is not simply to install more machines.

It is to match each stage to the material so the complete line operates with stable feeding, controlled temperature, predictable output, and consistent powder quality.

Frequently Asked Questions

What is the difference between a plastic pulverizer and a granulator?

A granulator cuts plastic scrap into millimeter-sized flakes or regrind. A pulverizer grinds suitable granules or flakes into much finer mesh- or micron-range powder.

What is the difference between a plastic shredder and granulator?

A shredder is designed for bulky primary size reduction using low-speed, high-torque cutting. A granulator processes smaller material at higher speed to create more uniform regrind.

Can a pulverizer replace a granulator?

Usually no.

If the input material is too large for the pulverizer, it must first be crushed or granulated.

However, if your raw material already comes as suitable pellets or granules, it may be fed directly into a pulverizer.

Can a granulator make plastic powder?

A conventional granulator is designed primarily for millimeter-sized regrind rather than fine powder.

If the downstream process requires powder, a pulverizer is generally the appropriate machine.

Do I need a shredder before a pulverizer?

Not always.

You need a shredder only when the raw material is too large, bulky, or difficult to feed into the next size-reduction stage.

For PE pellets used in rotomolding powder production, the material may go directly into the pulverizer.

Which machine is best for PVC recycling?

It depends on the PVC scrap.

PVC pipes, profiles, sheets, flooring, and boards often require:

Crusher → Pulverizer

Large or bulky PVC materials may require additional pre-shredding.

Which machine is best for rotomolding powder?

A plastic pulverizer is normally the key machine because rotational molding requires fine PE powder rather than flakes or coarse regrind.

Which machine is best for plastic recycling?

There is no single answer.

Use:

• Shredder for bulky waste

• Granulator for regrind

• Pulverizer for powder

A complete recycling system may use two or all three stages.

Final Conclusion: Choose by Final Output, Not Machine Name

The easiest way to choose between a plastic pulverizer, granulator, and shredder is to start with the material you need at the end of the process.

If you need coarse pieces, choose a shredder.

If you need uniform plastic flakes or regrind, choose a granulator.

If you need fine plastic powder, choose a pulverizer.

For large plastic waste that eventually needs to become powder, a multi-stage process is usually more efficient:

Shredder → Granulator / Crusher → Pulverizer

The correct system depends on:

• Input material

• Input dimensions

• Polymer type

• Final particle size

• Capacity

• Downstream process

• Energy consumption

• Wear cost

Rather than purchasing equipment based only on machine name or motor size, design the entire size-reduction process around the required final material.

Need Help Choosing the Right Plastic Pulverizer?

Maoyue specializes in plastic pulverizer machines and complete crushing and grinding systems for:

• PVC recycling

• PE / PP powder production

• Rotomolding

• Masterbatch

• SPC flooring

• Plastic compounding

• Engineering plastics

Send us:

• Your plastic material

• Photos of the raw material

• Maximum input size

• Required powder mesh

• Required capacity

• Destination country

Maoyue can recommend whether your project requires a standalone pulverizer or a complete crushing and pulverizing system.

Request a Customized Plastic Pulverizing Solution from Maoyue.