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Food-contact grade zirconia beads serve as the core adaptive grinding media for the continuous ball milling process of matcha. Relying on excellent physical and chemical properties, food-grade safety characteristics and process compatibility, these beads have become a core consumable that balances production efficiency, food safety and matcha product quality. They are even the mainstream preferred grinding media for the current small and medium-scale industrial mass production of matcha (with a daily output of 100-500 kg), and their comprehensive performance is far superior to traditional non-food-grade grinding media such as alumina beads.
The core operating principle of continuous ball milling equipment is to drive the grinding media and tea powder to undergo high-frequency impact, shearing and grinding through high-speed drum rotation. Its prominent advantage is realizing continuous feeding and discharging without shutdowns, meeting 24/7 uninterrupted production demands.
High wear resistance, low loss rate, and structural stability adapt fully to 300-500 r/min continuous operation. They effectively prevent shutdowns and replacements caused by media wear and breakage, drastically lowering production interruption risks.
Efficiently combined with traditional stone mills for "ball milling for coarse grinding + stone milling for fine grinding". Coarse ball milling quickly grinds pre-crushed tea blanks to D90=80-100 μm, reducing stone mill load and raising overall production efficiency by over 30%.
By leveraging the mild grinding characteristics of stone mills after initial ball milling, core flavor substances such as tea polyphenols and theanine, as well as the emerald green color in matcha, are retained to the maximum extent.
Ultimately, this composite process achieves a two-way balance between mass production efficiency and product quality, accurately meeting the core demands of "high efficiency, safety and high quality" in the current industrial production of matcha. It is widely applied in the large-scale production of mass consumer-grade matcha and mid-range gift matcha.
| Item | Food-Contact Grade Zirconia Beads (Matcha Milling Special) |
|---|---|
| Main Material | High-purity ZrO₂ + Food-grade Y₂O₃ (yttria-stabilized TZP) |
| ZrO₂ Purity | ≥95% |
| Y₂O₃ Content | 4.5~5.2% (food-grade stabilizer) |
| Crystal Phase | Tetragonal phase (TZP) |
| Microcrystal Diameter | ＜0.5μm |
| Mohs Hardness | ≥9.0 |
| True Density | ≥6.0 g/cm³ |
| Bulk Density | ≥3.6 g/cm³ |
| Wear Rate | ≤0.4 ppm (ppm level ultra-low wear) |
| Water Absorption Rate | ≤0.01% (dense structure, no water absorption) |
| Applicable Rotation Speed | 300~500 r/min (continuous ball milling equipment) |
| Common Particle Sizes | 0.8mm, 1.0mm, 1.2mm, 1.5mm, 2.0mm (customizable for matcha) |
| Food Safety Standard | Compliant with GB 4806.4-2023, FDA CPG 7117.06/07 |
| Shape | Spherical (high roundness ≥0.98, no burrs) |
Food-contact grade zirconia beads offer higher density, superior hardness (≥9.0 Mohs), and ultra-low wear rates (≤0.4 ppm). Unlike non-food-grade alumina media, they comply strictly with food safety standards (FDA, GB) and eliminate contamination risks while significantly enhancing milling efficiency.
In the coarse grinding stage, high-speed ball milling with zirconia beads reduces pre-crushed tea blanks to a particle size of D90=80-100 μm, increasing efficiency by over 30%. The stone mill then performs fine grinding, retaining delicate flavor substances (theanine, polyphenols) and natural green color.
These food-grade beads are optimized for continuous ball milling machinery operating at high speeds between 300 and 500 r/min without fracturing or wearing out excessively.
They fully comply with major global food-contact material safety standards, including GB 4806.4-2023 and FDA CPG 7117.06/07 standards.
Commonly specified spherical sizes range from 0.8mm to 2.0mm (such as 0.8mm, 1.0mm, 1.2mm, 1.5mm, and 2.0mm). Custom sizes can also be prepared based on specific mill machinery configurations.
