Crushing chamber

Plastic Crusher Blade Select: how to choose the right crusher blades?

If you are purchasing a crusher, or purchasing more spare knives for your existing crusher, you may have learned about bladed/ knives by various names.

But do you have a clear idea of which blade is better suited to your existing crusher machine production needs?

In this article we will describe how to choose the right crusher blades and what scenarios they are suitable for, and give you some advice on blade materials.

How to choose the right crusher machine blades?

Commonly used crusher machine blades can be classified by type as slice blade, flat blade, V-blade, and claw blade.

How you choose a crusher blade depends on your use scenario, the material to be crushed, and whether the material contains metal or other plastic impurities.

  • Slice blade:
plastic crusher chamber

Slice blades are suitable for plastic sheets, plastic plates, plastic pipes, plastic profiles and other brittle plastic products.

The advantage of the blade is that the crushed product is evenly granulated and the crushing output is large.

  • Flat blade:
Crushing chamber 1

Flat blades are suitable for crushing plastic boxes, thin tubing, blown plastic, PET bottles or other hollow plastic products with wall thickness not exceeding 3mm.

The advantage of the flat blade is the wide blade structure, which provides higher output when crushing thin-walled and thin plastic products.

  • V-shaped blade:

V-shaped blade is suitable for crushing all kinds of plastic film, plastic bags and other plastic products. Such as PE, PP film, grass-proof fabric, PP jumbo bags, food packaging bags, etc.

The advantage of V-blade is that it is not easy to jam the machine when handling soft plastic products with toughness.

  • Claw blade
plastic crusher chamber

The claw type blades are suitable for crushing all kinds of hard plastics, such as plastic rods, shoe last material, solid plastic blocks, etc.

The advantage of the claw blade is the greater cutting force per blade and less tool wear when breaking thick materials and hard plastics.

How to choose the right blade material?

The material available is spring steel, 55-silicon chrome, 9-silicon chrome, SKD-11, etc.

The choice of metal depends on the material you want to crush, the degree of cleanliness.


If you need to crush the material contains screws, iron set and other small metal solids, we do not recommend the use of too good metal materials, you can use spring steel or tool steel class of cheaper alloy material to reduce the daily wear and tear costs of the tool.

If the plastic material you need to crush contains less impurities and is cleaner overall, you can use SKD-11, DC53, D2 and other alloys as the raw material for the blade alloy.

The blade material is judged based on the durability and hardness of the blade.

The service life of die steel is generally about 5-6 times that of spring steel. It is 3 times the service life of tool steel.

crusher machine blades

Long service life, can be a long time without having to replace the blade of the blade is the best material. It is not possible to divide a blade based on the hardness and type of alloy.

How the blade works in the crushing chamber of the plastic crusher machines

The crushing chamber usually has several sets of fixed knives, while the blades on the rotor are rotary knives.

Materials from the crusher inlet into the crushing chamber, driven by the rotor on the rotor blade rotation, the bite with the fixed knife cut off through the screen filter fall, the completion of the entire crushing process.

plastic pipe crusher

Crusher selection blades tools are an essential part of any industrial operation that deals with material reduction and recycling.

These tools are used to crush and shred materials such as metals, plastic, glass, rubber, and even wood into smaller, more manageable pieces.

Factors to consider

There are several factors to consider when choosing the right crusher blades for your operation.

The Material

First and foremost, you need to consider the material you will be crushing. Different materials require different blade shapes and sizes to ensure efficient and effective crushing.

For example, softer materials such as plastic and rubber can be easily crushed with a single-edged blade, while harder materials such as metals may require a double-edged blade for efficient crushing.

Crusher machine’s capacity

Another important factor to consider is the size and capacity of the crusher blades. If you are dealing with large volumes of material, it is important to choose a crusher with a large capacity and powerful blades to ensure efficient and effective crushing.

On the other hand, if you only need to crush smaller amounts of material, a smaller crusher with less powerful blades may be sufficient.

Blades shape

In addition to blade shape and size, the type of blade material is also an important factor to consider when choosing crusher blades.

Typically, crusher blades are made from high-carbon steel, which is strong and durable.

However, some materials may require blades made from other materials such as tungsten carbide or ceramic for improved performance.

Requirements for flakes

Another important factor to consider when selecting crusher blades is the type of crushing operation you will be performing.

For example, if you need to crush materials into small particles, you may need to choose a crusher with blades that are designed for fine crushing.

On the other hand, if you need to crush materials into larger pieces, a crusher with coarser blades may be more suitable.

Alloy materials for blades

Finally, the quality of the crusher blades is also an important factor to consider. Poor quality blades can break easily and may not provide efficient and effective crushing. It is important to choose blades from a reputable manufacturer to ensure that they are made from high-quality materials and are designed to last.


In conclusion, choosing the right crusher blades is essential for efficient and effective material reduction and recycling. There are several factors to consider when selecting crusher blades, including the material being crushed, blade shape and size, blade material, type of crushing operation, and blade quality. By considering these factors, you can ensure that you choose the right crusher blades for your operation.

Nicety Machinery Co., Ltd As a manufacturer of plastic recycling equipment in China with the best after-sales guarantee, we welcome your inquiry for any type of plastic crusher or shredder machine!!

Plastic crusher machine
plastic crusher


2 Responses

  1. Simply desire to say your article is as astounding.
    The clearness to your put up is just cool and i could assume you’re knowledgeable in this subject.

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Matt. Lau

Matt. Lau

Hi, I'm the author of this post, and I have been in this field for more than 5 years. If you want to build a plastic recycling line or plastic related machines, feel free to ask me any questions.

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