Plastic shredder blades vs granulator blades: how to select the right crusher for plastic film and bags

If you want to pick the right crusher for plastic film and bags, understanding the difference between plastic shredder blades vs granulator blades is essential. For thin plastic waste like films and bags, crusher blades with one sharp edge make clean cuts and improve recycling efficiency. The blade you choose directly impacts how well you can process plastic waste and the amount you can recycle. Better recycling results come from matching the blade material, blade design, and machine compatibility. When comparing plastic shredder blades vs granulator blades, selecting the right crusher blades helps you handle plastic waste with less tool damage and more consistent output. Learning how blade choice affects plastic recycling will help you pick the best plastic crusher for your needs.

Principaux points à retenir

• Plastic shredder blades break big, tough plastic into larger pieces. Granulator blades cut plastic into small flakes for recycling.
• Pick blade types based on the kind of plastic. V-shaped blades work best for soft films and bags. Flat blades are good for thin plastics. Claw blades handle hard or thick plastics.
• Blade material changes how long blades last and how much they cost. Tool steel is cheap but wears out fast. High-speed steel lasts longer. Tungsten carbide lasts the longest for heavy use.
• Match blade thickness and crusher power to the plastic’s thickness. This gives better results and helps blades last longer. Thin films need sharp, thin blades. Thick plastics need strong, thick blades.
• Regular maintenance is important. Check, sharpen, and clean blades often. This keeps crushers safe and working well. It also reduces downtime and makes recycling better.

Blade Comparison

Plastic shredder blades vs granulator blades

When you look at plastic shredder blades and granulator blades, you notice they work differently. Plastic shredder blades break big, tough plastic into smaller pieces. Granulator blades cut plastic into small, even flakes. These flakes are ready for the next step in recycling. Knowing these differences helps you pick the right crusher for your recycling job.

Here is a summary table to help you see the main differences:

Tip: V-shaped blades are best for crushing plastic films and bags. They help stop jamming when you crush soft, tough plastics. Flat blades are good for thin plastics. Claw blades work well with hard or thick plastics.

Application for plastic film and bags

You may need to recycle many kinds of plastic waste, like LDPE films, PP bags, and food wrappers. The blade you pick depends on your recycling goal and crusher type. Plastic shredders run slowly but have strong force. They break big plastic waste into pieces about 15-40 mm. Granulators run faster and use thinner blades. They make smaller, even flakes, usually 8-12 mm, which are better for more recycling steps.

Nanjing Metal Plastic Crusher Blades come in many types. You can pick high-carbon steel or D2 tool steel. The blades are heat-treated and CNC-ground to stay sharp and strong. They have special coatings to stop rust and designs to lower shaking and wear. You can choose custom sizes and edge shapes to fit your crusher and the plastic you recycle.

If you want to save time and money, granulator blades are often better for film and bag recycling. They are easier to care for, cost less to change, and can get coatings to last longer. Shredder blades are strong but need more care and cost more to use. For custom blades, visit the page de lames personnalisées ou Contact Nanjing Metal for help.

Blade Types for Film and Bags

Plastic shredder

Structure Features

There are many kinds of plastic shredder blades. The most common ones are hooked, F-type, and V-shaped blades. Hooked blades grab and tear tough plastic waste. They work well with tangled films and bags. F-type blades have a small gap between moving and fixed blades. The V-shaped design stops soft plastic from wrapping around the blades. This helps the shredder work better and makes flakes about 40mm. The rotor holds the moving blades. The stator keeps the fixed blades in place. The way these blades are set up helps break big plastic pieces.

Matériaux courants

Plastic shredder blades must be strong. They are often made from tool steel, high-speed steel, or tungsten carbide. These materials make the blades hard and tough. They also help the blades last longer. Heat treatment makes the blades even stronger. Some blades have coatings to stop rust and wear.

Suitable Film/Bag Types

Plastic shredders are best for soft, tough plastic waste. You can use them for LDPE films, PP bags, food wrappers, and stretch films. They work well with tangled or bulky plastic waste. Hooked and F-type blades grip and shred these plastics without jamming.

Pros and Cons

Avantages :

• You can crush lots of plastic waste fast.
• The blades handle tough and tangled films and bags.
• The blades last long if you take care of them.

Inconvénients :

• The flakes are bigger and not all the same size.
• You may need extra steps to make smaller flakes.
• It can be harder to fix if the blades jam or wear out.

Tip: Use V-shaped or F-type blades to stop wrapping and help shredding soft plastic films.

Plastic granulator

Structure Features

Plastic granulator blades come in different shapes. You see teeth blades, staggered blades, and paddle blades. Teeth blades have a complex shape. They work for both rough and fine grinding. Staggered blades have big cutting angles. This design lowers resistance and makes cutting easier. Paddle blades use a V-type cutting action like scissors. This helps cut big plastic waste quickly. The rotor holds the moving blades. The stator keeps the fixed blades steady. The gap between blades is important. You must set it based on the widest blade for even flakes.

Matériaux courants

Plastic granulator blades are made from SKD11, V-4E, tool steel, and tungsten carbide. SKD11 is hard and wears well with regular plastics. V-4E is tougher and works with glass fiber-filled plastics. Some blades have carbide tips for extra strength.

Suitable Film/Bag Types

Plastic granulators work best with thin, clean plastic waste. You can use them for LDPE films, PP bags, and other soft plastics. Single bevel blades with steep angles make clean cuts for small amounts of plastic waste. Compound or reverse bevel blades work better for thick or large amounts of plastic.

Pros and Cons

Avantages :

• You get even flakes with less dust.
• The blades make small flakes ready for recycling.
• It is easier to fix and change blades, and costs less.

Inconvénients :

• The crusher works best with clean, thin plastic waste.
• You must set the blade gap right for good results.
• The blades wear out faster with tough or dirty plastic.

Note: Sharp blades that fit well and the right blade gap help you get good flakes and make the crusher work better.

Tableau comparatif

Here is a table to help you compare plastic shredder blades and plastic granulator blades for film and bag recycling:

If you want to crush lots of tough plastic waste, pick a plastic shredder. For clean, thin plastic waste and good flakes, use a plastic granulator.

Selection Criteria

How to select a plastic granulator

Assessing material type and form

You must know what plastic you want to recycle. Films and bags are made from LDPE, HDPE, or PP. Each type is different in strength and flexibility. Thin films need sharp blades and slow speeds. This stops them from tearing. Thick bags need stronger blades and more power. If you have mixed or layered films, use modular blades and rollers you can adjust. This helps you crush many types without hurting your crusher.

Evaluating film and bag thickness

How thick the film or bag is changes how your crusher works. Thin films like LDPE need sharp blades and careful feeding. Medium films need blades that are a bit stronger. Thick films like HDPE or PP need hard blades and powerful crushers. Thick blades last longer but use more energy. Always match blade thickness to the plastic for best results and longer blade life.

Considering contamination levels

Dirty films and bags can hurt your crusher and make bad flakes. You should sort and wash plastic before crushing. Take out dirt, sand, and other trash to protect your blades. For films with ink or layers, use special sorting and delamination. This keeps your crusher safe and helps you get clean flakes. If you crush dirty or layered films, pick a crusher with tough blades and easy cleaning.

Matching granulator type to recycling goals

Your recycling goals help you pick the right crusher. If you want good flakes to sell, use a granulator with fine cutting. For lots of tough plastic, use a shredder with high output. Some granulators can shred and make pellets for more options. Look for crushers with speed controls, strong feeding, and easy care. These features help you reach your goals and save money.

Common selection mistakes

1. Some people pick crushers that do not fit their plastic or needs. This causes low output, more dust, and fast blade wear.
2. Some forget about maintenance. Hard-to-reach blades or screens make cleaning slow and cause more stops.
3. Others ignore blade design. Blade number, angle, and sharpness change cutting and energy use.
4. Overfeeding the crusher can jam it, dull blades, and overload motors. Use automatic feeders to stop this.
5. Safety matters. Always pick crushers with emergency stops, safety locks, and easy checks.

Tip: Always check if the maker gives good support and service. Good help means less downtime and better results.

Material and contamination

Types of plastic films and bags (LDPE, HDPE, PP, etc.)

You will see many kinds of plastic films and bags. LDPE is soft and bends easily. It is used for grocery bags and wrap. HDPE is stronger and used for thick bags and packs. PP is tough and does not melt easily. It is used for food wrappers and woven bags. Each type needs a different crusher setup. LDPE works best with sharp blades and slow speed. HDPE and PP need strong blades and more power.

Impact of material thickness on blade choice

How thick the plastic is changes how your crusher works. Thick blades bend less and last longer with tough plastics. Thin blades cut soft films well but wear out faster with hard plastics. Thick blades need more power. Always balance blade thickness, hardness, and coating for best results and blade life.

Handling contaminated or multi-layer materials

Dirty or layered films need extra care. Sort and wash all plastic before crushing. Remove dirt, sand, and labels to protect your crusher. For layered films, use special tools to split layers. Advanced sorting, like near-infrared, helps you get cleaner plastic. This keeps your crusher safe and gives better flakes.

• Sort films by type, color, and density.
• Wash and dry to remove dirt and sand.
• Use special tools for layered films.
• Use advanced sorting for cleaner plastic.

Blade material options (tool steel, HSS, carbide)

Blade material changes cost and how long blades last. Tool steel blades are cheap but wear out fast. High-speed steel blades last much longer and work for most plastics. Tungsten carbide blades cost the most but last longest. They can crush over 1100 tons before you need new ones. Pick the blade material that fits your crusher and budget.

• Tool steel: Cheap, short life, good for light use.
• HSS: Medium price, long life, good for most plastics.
• Tungsten carbide: Expensive, longest life, best for heavy crushing.

Durability and maintenance considerations

Strong blades mean less downtime and lower costs. Pick blades with tough coatings for longer life. Easy access to blades and screens makes cleaning and fixing faster. Check blade sharpness and gap often to keep your crusher working well. Always keep spare blades ready to avoid long stops.

Output size and capacity

Required output particle size

You need to know what flake size you want before picking blades. Most film and bag recycling needs flakes between 8–12 mm. Claw blades are good for flexible films and bags. They cut well and do not clog. Flat blades make even flakes, which are best for high-quality recycled plastic.

Throughput and production capacity

Crusher size and power change how much plastic you can crush. Granulators can handle 100–700 kg/h, with motors from 7.5 to 37 kW. Shredders can crush 500–1000 kg/h, so they are better for big jobs. Always pick a crusher that matches your recycling needs.

Shredders like the SHREDALL Single Shaft PET Film Shredder can crush up to 1000 kg/h with a 50 hp motor.

Machine configuration for different output needs

You can change your crusher to get the flakes you want. Change blade types, screen sizes, and rotor speeds for different results. For flexible films, use monolayer machines with cold knives. For strong, layered films, use ABA blown film machines for more strength. Cooling with air or water also changes flake quality and how much you can crush.

Balancing efficiency and energy consumption

Efficient crushing saves energy and money. Mechanical recycling uses less energy than making new plastic. Sorting and cleaning use the most energy, so make these steps better. Use motors that save energy and speed controls. Change your process to waste less and crush better.

Adjusting blade gap and screen size

Blade gap and screen size change flake quality. A small gap cuts better and makes less noise. Small screen holes make even flakes but slow crushing. Big holes crush faster but flakes are less even. Change rotor speed and knife setup for best results.

• Change blade pitch and screen size for different plastics.
• Keep the gap between moving and fixed knives right for flake size.
• Use fast rotation and the right screen for good crushing.

Note: Always check and change blade gap and screen size to keep your crusher working well.

Practical Tips

Matching blade type to recycling scenarios

To get the best results, pick the right blade. If you work with soft plastic film or bags, use V-shaped or claw blades. These blades cut soft plastic well and help stop jams. For thick or hard plastic, flat or strong blades are better. They cut tough plastic and last longer.

Think about what you want from recycling. If you need small, even flakes, use a granulator with sharp, thin blades. This helps you work faster and makes sorting easy. For big, tangled plastic, use a shredder with hooked or F-type blades. These blades break up plastic fast. Always check what kind of plastic you have. Change the blade shape and gap to fit the plastic. This keeps your crusher working well and saves time.

Tip: Make a chart that shows which blades work best for each plastic. This helps you switch blades fast and keeps your recycling line working well.

Maintenance and safety

Taking care of your crusher keeps it safe and working well. Train everyone on how to use and fix the machine. Always wear gloves and goggles when near the crusher. Before fixing anything, turn off the power and air. Wait until everything stops moving before you open the cutting chamber.

Follow these steps to keep your crusher safe:

1. Check blades and screens every week for dull or broken parts.
2. Sharpen blades every 100–300 hours. Change them after 500–1000 hours, depending on use.
3. Clean the feed port and crushing chamber often. Use air, not water or strong cleaners.
4. Look for loose bolts and make sure guards are on before starting.
5. Use the right tools to lift heavy parts. Lift with your legs, not your back.
6. Listen for strange sounds or shaking. Tell someone if you notice problems.

Note: Checking your crusher often and training everyone helps stop accidents and keeps your recycling line working its best.

When you pick between plastic shredder blades and granulator blades, think about what kind of blade you need, what it is made of, and what you want to do with your recycling. V-shaped blades work best for films. Flat blades are good for thin plastic. Use SKH-9 blades for soft plastic. Choose SKD-11 blades for tough plastic jobs. Look at the table below before you make your choice:

Good blades and taking care of your crusher help it last longer. If you need special blades, talk to our sales engineer ici.

FAQ

What is the main difference between plastic shredder blades and granulator blades?

Plastic shredder blades break big plastic into smaller pieces. Granulator blades cut plastic film and bags into tiny flakes. Shredders work on tough jobs. Granulators make small, even flakes.

How do I choose the right plastic crusher for film and bags?

Look at what kind of plastic you have. Check how thick it is and if it is dirty. See how much plastic you need to crush. Pick blades that fit your recycling job. Make sure the crusher works well with your plastic and gives the output you want.

Why does blade material matter for recycling efficiency?

Blade material changes how long blades last. Strong blades like tool steel or carbide cut better. They help you crush more plastic film and bags. This makes recycling faster and keeps your crusher working longer.

Can I use the same crusher for different types of plastic crusher machines?

Some crushers work with different machines. You must check if the blades fit and if the settings are right. Always match blade type and crusher setup to your plastic. This keeps things safe and helps you get good results.

How often should I maintain or replace blades in a plastic granulator?

Check blades every week. Sharpen them after 100–300 hours. Change blades after 500–1000 hours, based on how much you crush and what plastic you use. Regular care keeps your granulator working well and stops breakdowns.

Voir aussi

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Quand remplacer les lames du broyeur à plastique : signes d'usure et conseils d'entretien

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