What Is the Coating Efficiency of a JSGX Modification Mill

JSGX is a continuous three‑rotor vortex surface modification mill developed by JACAN, widely integrated after the air classifier in ATH ultrafine powder production lines. Coating efficiency (also called activation rate or surface coverage rate) describes the percentage of ATH particle surface successfully bonded/coated with modifier, which is the core performance indicator for this equipment.

Typical coating efficiency range for ATH

Under well‑tuned operating parameters for aluminum hydroxide:

• Silane modification (LSZH cable grade ATH): ≥95% surface coverage
• Stearic acid modification (artificial stone / general plastic ATH): 94–97% surface coverage

This performance is achieved when the system runs at stable feed rate, precise modifier atomization, correct rotor speed and controlled material temperature (kept below 110 °C to avoid ATH crystal water decomposition).

How JSGX achieves high coating efficiency

The JSGX mill adopts a multi‑stage three‑rotor turbulent chamber design:

1. Strong high‑speed shear first fully breaks ATH micro‑agglomerates. Without de‑agglomeration, modifier only coats the outer layer of agglomerate clusters and leaves inner particles unactivated.
2. Atomized modifier is injected into the high‑turbulence zone, and particles experience repeated intense collision across sequential modification chambers.
3. Friction heat generated by particle collision provides mild reaction energy, eliminating the need for external heating.
4. Negative pressure continuous flow ensures uniform powder residence time inside the modification cavity, avoiding short‑circuit flow of uncoated powder.

Key factors that reduce JSGX coating efficiency

1. Unstable powder feed rate: Fluctuating ATH feed breaks the fixed modifier/powder ratio and causes partial under‑coating.
2. Poor modifier atomization: Large liquid droplets lead to local over‑coating on some particles and no coating on others.
3. Excessive incoming powder moisture: Wet ATH causes agglomeration inside the modification chamber and lowers activation rate.
4. Incorrect rotor speed: Too low speed cannot fully disperse agglomerates; too high speed generates excess heat and risks ATH dehydration.
5. Improper modifier dosage: Insufficient dosage cannot reach full surface coverage; over‑dosage creates free unbonded modifier and blooming.

Practical test methods to verify coating efficiency for ATH

1. Water floating test: Modified ATH floats on water; unmodified powder sinks. Used as a quick on‑site qualitative check.
2. Contact angle measurement: Higher contact angle means better hydrophobic surface coverage.
3. Polymer composite property test: Tensile strength, elongation and dielectric performance of filled compounds are indirect indicators of effective coating.
4. FTIR analysis: Detects the chemical bonding state between modifier and ATH surface hydroxyl groups.

Comparison note

Batch high‑speed mixers often achieve only 85–92% coverage for fine ATH. The continuous JSGX modification mill can maintain stable ≥95% coating efficiency for mass ATH production, which is critical for consistent LSZH cable compound performance.

For industrial ATH powder, the JSGX three‑rotor modification mill delivers 94–97% coating efficiency, normally stably above 95% under optimized conditions for silane‑treated cable‑grade ATH. Its multi‑stage vortex deagglomeration and continuous atomized dosing design enable uniform modifier coverage, reducing modifier consumption and stabilizing composite mechanical and electrical properties.