How Tire Cutting Machines Work: Process Stages, Blade Performance, and Common Challenges

How Industrial Tire Cutting Machines Reduce and Separate Material

Modern tires are made of more than just rubber. Each tire has a skeleton made of polyester, rayon, or fabric cords wrapped in rubber. These cords enhance the tire’s shape and increase its capacity to bear your car’s weight.

Tires also have steel belts and steel wire bundles in the tread and other parts of the tire to help resist punctures and improve handling on different road surfaces. Each tire contains a blend of natural and synthetic rubber.

Effectively recycling tires involves separating the steel bead wire, fabric cables, and rubber. Your tire cutting machine process each component differently to transform it for other uses. In a high-volume production environment, you need to process tires in a specific order: Preprocessing, primary shredding, and granulation.

The Main Stages of Industrial Tire Processing

Tire recycling starts with pre-processing, which involves debeading and cutting. After you’ve cleaned mud and debris from the tire, you use a sidewall cutter to separate the sidewalls. This is where the steel cables and other metal components reside. Removing sidewalls speeds up downstream rubber processing by removing the risk of rogue metal pieces. (Source)

The machine uses a debeading hook and magnets or other tools to remove the steel bead wire. You use the industrial tire cutter to shred metal scraps into small, uniform pieces. (Source)

Next comes the initial shredding process. During this stage, tire recycling blades tear the rubber into smaller pieces using high-torque rotation. (Source) If you’re breaking the rubber into finer pieces for mulch or playground equipment, you would shred it a second time.

Feed the rubber into a grinding machine that uses granulator blades to chop rubber into small particles. Some recyclers will use heat or chemicals to process the rubber. (Source) Crumb rubber consists of small, granular pieces of rubber used to fill synthetic turf, make asphalt, and other industrial applications. You can larger pieces to make tire-derived fuel.

Blade Performance Requirements in Tire Cutting Applications

There’s more than one type of industrial tire cutter. Tire recycling blades break down rubber, dense fabric, and high-carbon steel. Each component needs a blade with the right geometry to break it down effectively.

For the initial shearing stage, your blades will encounter rubber, synthetic fibers, and high-tensile steel wires. A blade that cuts through rubber like butter might chip when it comes into contact with steel bead wires.

• Primary Shearing: Straight shearing blades made of D2 tool steel or a similar high-carbon steel are commonly used in the primary shearing and sidewall cutting steps. (Source) These blades are wear resistant and cut through tough metal easily to keep it from fraying. You may also use industrial shredder blades at this stage.
• Downstream Processing: If you’re processing the rubber into small pieces, you would use a granulator knife. Granulator blades are made with high-chrome steel alloys and heat-treated to increase blade hardness and edge retention. Rubber is abrasive, so you need a blade that can withstand the wear and tear. Regular granulator maintenance will also extend blade life.

Tire recycling blades need excellent wear resistance to withstand road grit, sand, and steel components. You need a tough blade that resists chipping and cracking to keep your machine running smoothly. A cracked blade can cause shrapnel to fly out and damage rotors, gears, and other machine components.

Tire shredding also generates a lot of heat. You need blades that can withstand high temperatures without warping, softening, and discoloring.

Common Challenges in Scrap Tire Processing Operations

Processing scrap tires strains even the toughest blades. Common operational challenges include:

• Blade Dulling: Since your blades are constantly cutting abrasive, touch materials, the edges will dull faster than if you were cutting through a softer surface.
• Excessive Heat: The same forces causing blade dulling also generate a lot of friction during the recycling process. This creates a lot of heat. Additionally, rubber is a thermal insulator, meaning it retains heat. (Source)
• Material Contamination: Recycled rubber isn’t pure like a new rubber sheet. Chemical additives, road debris, and other tire components contaminate the material, which can impact blade wear.
• Inconsistent sizing: Dull or chipped blades, or blades that are misaligned, can cause inconsistent granules. They also put more strain on your equipment. (Source)
• Steel Wire Damage: If your granulator blades or other downstream blades catch a stray piece of steel, it can cause premature wear, chips, and blunting.

Industrial blade wear is normal. Check your blades for signs of wear after every shift. Sharpen your blades regularly to keep your machines running smoothly and prevent downtime. If you notice throughput dropping, inconsistent cut quality, or increased friction, look at your blades. It’s probably time to sharpen them. In general, you should be sharpening them every 3,000 – 5,000 cuts, but you will learn what’s right for your machine through regular inspections. (Source)

Improving Throughput and Reducing Downtime Through Proper Blade Maintenance

High-speed processing of abrasive material puts a strain on the best blades. Choosing blades made specifically for shearing metal, rubber, and fibers will improve your machine’s lifespan.

Once you’ve customized your blades, sharpen them regularly to keep them working like new. Pick blades that meet OEM specifications so your machine works correctly. Hyde’s 150 years of experience in customizing industrial blades speeds up your turnaround time. We know how to fabricate and treat your blades specifically for tire processing. We know machinery and work to your OEM specifications.

Get a quote today for your custom tire recycling blades.