Products
Plastic Granulator Blades & Crusher Knives
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Complete Granulator Blades & Crusher Knives Set:
Each **granulator blades & crusher knives** set gives your plastic recycling line a ready-to-run package instead of loose, mismatched parts. SHJ KNIFE aligns blade sizes, hole patterns and spacers so your maintenance team can swap tools with less trial and error. -
Matched Granulator Rotor and Bed Knives:
The **granulator rotor and bed knives** in each set work as a matched pair. Correct thickness and geometry help you set the cutting gap faster, keep the load on the motor stable and hold a consistent flake size in daily production. -
Blade Sizes Tuned to Real Granulator Dimensions:
SHJ KNIFE produces **granulator blades** in common B2B sizes such as 300×50×20 and beyond. Clear size marking and repeatable tolerances make it easier for engineers and buyers to match plastic granulator knives to their existing machines. -
Wear-Resistant Materials for Film, Bottles and Regrind:
We select tool steels and alloy grades for our **plastic granulator knives** and **crusher blades** to suit film, bottle flakes and production scrap. Controlled heat treatment keeps the cutting edge hard and the core tough, so you extend blade life and reduce unplanned stops.
Features
Plastic Granulator Blades & Crusher Knives Manufacturer
When your granulator or crusher cuts clean, the whole plastic recycling line becomes easier to run. Good granulator blades and crusher knives keep flake size stable, reduce dust and protect the extruder. Worn or poorly matched blades do the opposite: they raise energy use, increase noise and force operators to stop the machine more often.
SHJ KNIFE focuses on plastic granulator knives, crusher blades and granulator rotor and bed knives for film, bottle and regrind applications. We design blades around real B2B needs: exact dimensions such as 300×50×20, repeatable quality, and short lead time for replacement orders. Our goal is simple-help your machines cut more material with fewer problems.
What Plastic Granulator Blades and Crusher Knives Do ?
Granulators and crushers sit at the center of most plastic recycling and compounding lines. They turn scrap into controlled chips or flakes that downstream processes can handle.
- Granulator blades shear material between rotor and bed knives.
- Crusher knives break bulky parts and bottles into smaller pieces.
Together, they decide how evenly the material feeds, how much dust you produce and how often you need maintenance.
With the right plastic granulator knives and crusher blades, you get a stable particle size, a smoother load on the motor and a cleaner working environment.
Types of Granulator Blades and Crusher Knives
Standard Granulator Blades for Plastic Regrind
Standard granulator blades handle daily regrind jobs: sprues, runners, edge trim, parts and small purgings. SHJ KNIFE tunes the cutting angle, relief and thickness so the rotor pulls the scrap into the cutting chamber rather than bouncing it away. These plastic granulator knives produce clean flakes with low fines, which helps the extruder or injection machine digest more recycled content without constant parameter changes.
Plastic Crusher Knives & Crusher Blades
For pre-breaking and heavy sections, plants rely on crusher knives. SHJ KNIFE manufactures crusher blades for bottle crushers, lump breakers and pre-shredders that feed granulators. We design tooth profiles and cross-sections that give enough strength to survive impact from thick walls, stiff ribs and compacted bales, while still cutting instead of smashing. This way, the granulator sees controlled pieces instead of random chunks.
Granulator Rotor and Bed Knives Sets
Cutting quality depends on how granulator rotor and bed knives work together. SHJ KNIFE supplies matched sets so rotor and bed blades share the same geometry and clearance. Accurate seating faces and consistent thickness help you set the gap quickly after regrind or changeover. With correct granulator rotor and bed knives, you reduce vibration, lower power draw and keep flake size within a narrow band.
Granulator Blade Sizes and Custom Dimensions
Many maintenance engineers search by size first: "granulator blades 300×50×20" or similar. They know the machine; they just need reliable blades in the correct dimensions. SHJ KNIFE supports this way of working:
- We produce granulator blades and crusher knives to common industry sizes.
- We can mark each blade with size and position to simplify installation.
- We offer size charts and drawings so you can check dimensions before placing an order or downloading a CAD file.
If your granulator or crusher uses a special design, we can still help. Send us a sample or drawing, and we will supply custom granulator blades or custom crusher blades that match your current set-up.
Materials and Heat Treatment for Granulator Blades
Different plastics wear blades in different ways. Simple PP regrind behaves very differently from glass-filled PA, PET bottle flakes or filled films. SHJ KNIFE chooses steels and heat treatment to match your material list instead of using a single grade for everything.
Typical options include:
- Tool steels for general-purpose granulator blades that balance hardness and toughness.
- Higher alloy grades for abrasive or filled compounds where edge life is critical.
- Tougher grades for crusher knives that must take repeated impact without cracking.
We control hardening and tempering to keep a hard, wear-resistant edge and a tougher core. This balance helps you run more hours between blade changes and reduces the risk of catastrophic failure inside the cutting chamber.
OEM Replacement and Customization
Many plants already run well-known brands of granulators and crushers. They do not want to redesign the machine. They simply need OEM replacement granulator blades, crusher blades and granulator rotor and bed knives that fit correctly and last longer.
SHJ KNIFE can:
Match blades to existing dimensions, hole patterns and chamfers.
Work from worn samples when no drawing exists.
Supply complete sets so you can change all blades in one stop and restore the original cutting circle.
Brand names, if you decide to list them on your website, serve only as compatibility references. SHJ KNIFE does not claim any affiliation with the original equipment manufacturers, and all trademarks remain with their owners.
Applications – Film, Bottles and Edge Trim
Film and Bags
Thin film and bags tend to wrap around the rotor and clog the screen if the blades do not cut cleanly. SHJ KNIFE uses sharper profiles and controlled clearances on plastic granulator knives for film. The blades slice material into short flakes, which improves washing, drying and feeding into the next process.
Bottles and Rigid Parts
Bottles, closures and rigid parts demand stronger tooling. Here, a combination of crusher knives for pre-breaking and granulator blades for final sizing works best. SHJ KNIFE designs these blades to handle thicker walls and stiff ribs without chipping, so the line stays productive even with mixed rigid scrap.
Edge Trim and Inline Regrind
Inline edge trim and production scrap feed directly back into the process. This stream needs consistent flake size and low dust, otherwise you see pressure fluctuations, black specks or surface defects. Well-matched granulator rotor and bed knives keep regrind within a narrow size window, so process engineers do not need to constantly adjust recipes or screw speed.
FAQ – Granulator Blades and Crusher Knives
Q1: How often should I replace granulator blades?
The interval depends on material type, contamination and running hours. Many plants inspect granulator blades on a fixed schedule and regrind them when the edge radius increases rather than waiting for visible quality issues.
Q2: Can I re-sharpen plastic granulator knives and crusher knives?
Yes. Most plastic granulator knives and crusher blades allow several regrind cycles if you keep the original angles and cutting circle. Proper grinding extends tool life and protects the rotor and bearings.
Q3: What is the difference between granulator blades and crusher blades?
Granulator blades mainly shear material between rotor and bed knives to create controlled flakes. Crusher blades break larger or thicker pieces into smaller chunks before granulation. Many lines use a crusher before the granulator for bulky items.
Q4: How do I choose the right steel for my blades?
Start from your material mix. Simple PP or PE can use standard tool steels. Glass-filled, PET or highly filled compounds need higher wear resistance. SHJ KNIFE can recommend a grade once you share the main plastics and your target blade life.
Q5: Can you supply matched sets of granulator rotor and bed knives?
Yes. We often supply granulator rotor and bed knives as complete sets. Matched sets make it easier to set the gap, reduce vibration and restore the original cutting performance after a blade change.
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