High-Performance Zirconia
Ceramic Bedknives
For PET & PA Pelletizing Systems
Premium zirconia ceramic bedknives designed for PET and PA strand pelletizing systems, delivering zero metallic contamination, cleaner cuts and extended service life compared with traditional carbide solutions.
Engineered for Melt Purity,
Designed for Performance.
In high-purity polymer processing industries, cutting stability and melt purity are critical factors. Our Zirconia (ZrO₂) ceramic bedknives are designed for demanding PET and PA6/PA66 pelletizing applications where contamination control and consistent cutting performance are essential.
Unlike traditional carbide knives, zirconia offers a chemically inert and ultra-wear-resistant cutting surface, helping minimize metallic contamination and maintain stable pelletizing performance.
PET
Polyester Fibers& Films
Zero contamination
High melt purity
Stable cutting
PA6 / PA66
Polyamide EngineeringPlastics
Wear resistance
Clean cutting
Longer service life
Synthetic Fiber
High-tenacityFibers
Consistent quality
Reduced contamination
Better spinnability
Film / Sheet
BOPET / BOPAFilms
Smooth surface
Reduced fines
Higher yield
HIT Zirconia Ceramic Bedknife
Precision-engineered zirconia ceramic bedknives for polymer pelletizing applications. Designed for excellent wear resistance, dimensional stability and reliable cutting performance.
Ceramic Bedknife
Precision-engineered zirconia ceramic
Pelletizer Bedknife
For polymer pelletizing applications
Pelletizing Fixed Knife
Custom dimensions and configurations
Precision Details for Reliable Performance
Precision machining and grinding are applied to critical features including mounting holes, geometry, dimensions and finished surfaces for reliable installation and consistent pelletizing performance.
Direct Threading in Zirconia
Precision-machined threads directly in the ceramic body for secure and accurate installation.
±0.002 mm Precision
Precision grinding for critical dimensions, flatness and mounting accuracy.
High Surface Quality
Controlled grinding and finishing support stable contact and consistent cutting performance.
Custom Engineering
Dimensions, hole positions and geometry can be manufactured according to customer drawings.
Strategic Customization: Extending Rotor Service Life
Restore the optimal cutting gap with precision-engineered ceramic bedknives tailored to your pelletizing system.
The Challenge
Rotary knives are periodically reground during operation, which gradually reduces their cutting diameter and changes the gap between the rotor and bedknife.
An incorrect cutting gap may result in tailing, unstable cutting performance, and reduced pellet quality.
Our Engineering Solution
We provide non-standard ceramic bedknives with customized thickness and dimensions to compensate for rotor regrinding.
By precisely adjusting the bedknife geometry, we help restore the optimal cutting gap and maintain stable pelletizing performance.
The Value
-
Extended Rotor Utilization
Reduce unnecessary replacement of expensive rotary knives. -
Stable Pellet Quality
Maintain consistent cutting conditions throughout production. -
Custom Engineering Support
Solutions tailored to BKG®, MAAG® and other pelletizing systems.
From Precision Machining
to Crack Inspection
Every ceramic bedknife goes through controlled machining and inspection processes to help ensure accurate geometry, consistent cutting performance and reliable quality before delivery.
Precision Machining
Precision machining and finishing help maintain accurate geometry, edge quality and dimensional consistency for demanding pelletizing applications.
Dye Penetrant Inspection
Dye penetrant inspection is used to reveal surface-breaking cracks or defects that may not be readily visible during normal visual inspection.
Manufacturing and inspection are carried out as part of our quality-control process for ceramic pelletizing knives.
Every Knife. Every Thread. 100% Inspected.
Every zirconia ceramic bedknife undergoes 100% inspection before delivery. Each threaded hole is individually checked and tested to verify dimensional accuracy, thread integrity and resistance to installation stress.
100% Dimensional & Thread Inspection
Every ceramic bedknife is fully inspected, including each individual threaded hole, to ensure dimensional accuracy and reliable installation.
12 N·m Simulated Torque Testing
Both sides are subjected to simulated installation torque testing to verify thread strength and ceramic integrity under assembly stress.
Penetrant Crack Inspection
After torque testing, penetrant inspection is performed to reveal potential microcracks. The surface is then cleaned with alcohol, and only knives showing no crack indications pass final inspection.
Why Zirconia for Pure Polymer Pelletizing
A comparison between conventional carbide bedknives and HIT Series zirconia ceramic solutions.
| Feature |
Conventional Carbide Bedknives |
HIT Series Zirconia Ceramic |
Application Benefit |
|---|---|---|---|
| Material | Carbide / Alloy Materials | High-Purity Zirconia (ZrO₂) | Stable material quality and consistent performance |
| Material Suitability | Reinforced Polymer Applications | Pure PET / PA / PBT Applications | Optimized for contamination-sensitive production |
| Matte Chip Performance | Moderate Wear Resistance | HIT Specialized for TiO₂ Matte Chips | Designed for semi-dull and full-dull chip processing |
| Sizing Capability | Standard Dimensions | Bespoke Non-Standard Dimensions | Supports rotor compensation after regrinding |
| Contamination Risk | Potential Metallic Transfer | Zero Metallic Contamination Risk | Helps prevent black spots and impurities |
Designed for High-Purity Polymer Applications
Zirconia ceramic bedknives are engineered for polymer processing where cutting stability, cleanliness, and contamination control are critical.
PET & PA Pure Resins
For textile, film and bottle-grade production
- Textile-grade PET chips
- Bottle-grade PET production
- PA6 / PA66 polymer applications
Semi-Dull & Full-Dull Chips
HIT Series for TiO₂ Matte Chips
- Semi-dull PET chips
- Full-dull PET chips
- High TiO₂ content polymers
High-Purity Polymers
Where contamination control is critical
- Optical-grade polymers
- Medical-grade materials
- High-purity fiber applications
Typical Models & Dimensions
Standard and customized dimensions are available according to your pelletizing system requirements.
| Parameter | Capability |
|---|---|
| Material | High-Purity Zirconia (ZrO₂) |
| Thickness | Customized according to rotor condition and cutting gap requirements |
| Dimension | OEM-compatible replacement for BKG®, MAAG®, Automatik and other systems |
| Tolerance | Precision engineered according to system requirements |
| Customization | Non-standard dimensions available for rotor compensation after regrinding |
Proven Performance in PA6 Nylon Pelletizing
A demanding semi-dull and full-dull PA6 nylon application where HIT zirconia ceramic bedknives delivered significantly longer service life under actual production conditions.
Premium Semi-Dull / Full-Dull PA6 Nylon Ceramic Bedknife Solution
PA6 Semi-Dull & Full-Dull Nylon Chips
CAMA Strand Pelletizing System
The Challenge
High titanium dioxide (TiO₂) content in the semi-dull and full-dull PA6 nylon caused conventional ceramic bedknives to wear rapidly, limiting service life to approximately 15 days. Frequent blade replacement resulted in repeated production interruptions.
Our Solution
Imported HIT zirconia ceramic bedknives were introduced for this application. The higher hardness and toughness of the HIT zirconia ceramic improve wear resistance under the demanding processing conditions of semi-dull and full-dull PA6 nylon.
Need a Ceramic Bedknife Solution
for Your Pelletizing System?
Share your material, pelletizing system and current blade requirements.
Our engineers will recommend a suitable zirconia solution.
SZSUNLIT — Precision-engineered pelletizing knife solutions for cleaner cuts, longer service life and stable production.
