The Secret Behind a High-Quality Grinding Bristle

🔍 Step 1: Precision Raw Material Sourcing

It all starts at the source.
We select premium nylon from world-leading suppliers: DuPont (USA), BASF (Germany), Sinopec (China).
Colorization uses imported Clariant pigment powder.
For abrasives: Black silicon carbide undergoes multi-stage processing — crushing, ball milling, sand formation, acid washing, and water rinsing — to ensure uniform grain size and high purity.

⚖️ Step 2: Exact Abrasive-to-Nylon Ratio

The abrasive-to-nylon ratio is a core technological secret.
Too low → insufficient cutting power.
Too high → brittleness and breakage.

Using a twin-screw extruder with precise temperature control (250–270°C) and high-shear mixing, we ensure uniform dispersion of abrasive particles in the nylon matrix.

🪄 Step 3: Extrusion & Initial Formation

The molten mixture is extruded through a die with precise hole diameter to form the primary fiber.
Key: Control over extrusion speed and cooling rate directly affects fiber roundness and diameter uniformity.

🔁 Step 4: Heat Drawing & Molecular Alignment

The pre-formed fiber undergoes multiple stages of thermal drawing.
This aligns polymer chains, dramatically improving strength, wear resistance, and durability.
Final mechanical properties are determined by the perfect balance of draw ratio, temperature, and speed.

🛡️ Step 5: Functional Surface Coating

Custom treatments based on customer needs:
• Anti-static | • Antibacterial | • Flame retardant
High-end products may include surface coating to increase abrasive retention.

🌀 Step 6: High-Accuracy Winding

Wound via spindle or disc packaging, ensuring neat bundle, uniform tension — ready for downstream brush manufacturing.