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What’s GrindFil?

GrindFil is made from high-quality nylon PA612/PA610/PA6 as the base material, uniformly blended with silicon carbide or aluminum oxide grinding particles. Through extrusion and drawing spinning processes, it is produced as a unique brush filament. The production process is illustrated in the workflow diagram below.

It combines the excellent chemical resistance and outstanding bending recovery capability of nylon, enabling it to adapt to various high and low-temperature environments and dusty conditions without being affected by external factors. With the assistance of abrasive particles, its grinding capability is enhanced, making it suitable for manufacturing twisted brushes, strip brushes, belt brushes, disc brushes, brush rolls, and cup brushes. These are used for surface treatment of wood, steel, metal, glass, and ceramic materials.

GrindFil is uniformly distributed with abrasive particles throughout, including the outer surface, cross-section, and core, forming rough, hard, and small angular edges. When the equipment drives the brush at high speed, the densely packed filaments friction the surface, achieving dust removal, finishing polishing, paint stripping, deburring, edge trimming, grinding, and removal of oxide layers. It maintains consistent surface processing effects over time, belonging to flexible grinding without damaging the original dimensions of the workpiece.

The full rough structure of GrindFil provides 360° full-angle grinding and polishing functions. Combined with the elasticity of the brush filaments, it can reach small and intricate areas, making it particularly suitable for surfaces with irregular shapes such as convex and concave surfaces, holes, grooves, and inner walls of pipes. It is ideal for overall industrial finishing polishing and cleaning/descaling of the workpiece.

Selection Recommendations:

Consider industry conditions and working environment characteristics, such as dry/wet grinding processing, speed, pressure, temperature, fiber length, surface hardness and roughness of the workpiece, processing requirements, and reasons for brush wear-out. Match product features and values to select the appropriate grinding brush filament.

Types of Abrasive Particles:

Silicon Carbide : Particularly suitable for removing burrs and improving surface quality.

Aluminum Oxide : Less sharpness and grinding efficiency compared to SIC abrasive fibers; mainly used for polishing and smoothing soft metal surfaces.

Ceramic: Strong cutting ability and self-sharpening properties; suitable for textile brushing and precision grinding.

Diamond: Primarily used for high-strength materials; achieves higher surface precision.

Abrasive Content:

Generally, the abrasive content in abrasive filaments ranges from 15-30%. For diamond-based brush filaments, the content is lower 5-20%. Higher abrasive content, under identical conditions, results in stronger grinding capability. GrindFil has 15-30% abrasive content.

Grit Size Selection:

Larger grit size corresponds to smaller mesh numbers, resulting in higher grinding force and the ability to remove larger particles or harder-to-remove contaminants (e.g., burrs) from the surface. It is suitable for applications requiring cutting performance.

Smaller grit size (higher mesh numbers) results in a smoother and more aesthetically pleasing surface, primarily used for surface finishing.

Coarse grinding: #46-#180

Finishing grinding: #180-#320

Fine grinding: #320-#600

Polishing: #800-#1500

Coarse abrasive grit is larger and sparsely distributed, enabling faster removal of material and achieving a rough surface finish.

Fine abrasive grit is smaller and densely packed, removing minimal material and achieving a smooth and refined surface finish.

Filament Diameter Selection:

Larger diameter filaments: Apply greater pressure during contact, resulting in faster processing and higher material removal.

Fine diameter filaments: Suitable for flexible and precise grinding and polishing.

Nylon Base Material Selection:

PA612: Excellent comprehensive performance, suitable for harsh working conditions or high-value applications.

PA610: Cost-effective and versatile, suitable for grinding brushes with fast wear and lower speeds.

PA6: Flexible and elastic, with lower grinding efficiency, suitable for coarse-diameter brush filaments in dry grinding applications.

Testing Methods:

We determine the abrasive content of GrindFil according to the international standard ISO 3451-1:1997. The abrasive content is measured using a direct calcination method.

Testing Process:

1. Sample weighing

2. Drying to remove moisture

3. Heating and calcination

4. Weighing the sample after calcination

5. Abrasive content (%) = [(C - B) / A] × 100

Through the test, the abrasive content is accurately measured to be around 30%.

Operating Procedures:

1. Use a special wrench to clamp the bristles between two rotating chucks, ensuring the effective distance between the chucks is 100 ± 5 mm.

2. Attach standard weights corresponding to the test requirements to the tail end of the left chuck.

3. Start the twisting machine, rotate the bristles until they break, and record the number of twists.

Product Advantages:

High-Temperature Stability: GrindFil exhibits excellent high-temperature stability. Even in high-cutting environments, it maintains stable product performance and efficiency without melting or deforming, ensuring long-lasting grinding effects. Its high thermal conductivity effectively reduces workpiece quality issues caused by temperature increases during material processing, making it ideal for applications requiring high-temperature use, such as electronic component manufacturing or optical component polishing.

Efficient Processing and Polishing: GrindFil is produced using a co-extrusion process of nylon and abrasive particles. Its unique feature lies in the sharp cutting edges of the abrasive particles, which are randomly distributed and firmly anchored on any working surface, regardless of its shape. As the brush moves over the workpiece surface, individual filaments bend in various angles to adapt to the contours of the workpiece, ensuring full contact between the abrasive particles and the surface. This results in efficient and precise grinding and polishing.