Metal Grains (Metal Powder)
Metal Grains (Metal Powder)
- High mechanical strength and superior compaction resistance.
- Extremely irregular surface for maximum particle capture efficiency.
- Substantially inert to polymer melts to prevent gel formation.
- Extends spin pack service life and improves POY/FDY yarn quality.
The History of Development of Metal Powder for Polymer Filtration Media
Molten high polymers (such as PET, PA, and PP) require rigorous filtration before chemical fiber spinning to remove impurities and gel particles. This prevents spinneret hole blockages and significantly improves the quality of POY/FDY filament yarns.
When the polymer melt flows through the spin pack screen, it generates resistance, causing shear friction that increases temperature and improves melt rheological properties. Additionally, the melt is thoroughly mixed and distributed uniformly to prevent viscosity differences.
Why Irregular Stainless Metal Powder?
Although sea sand is cheaper, it is extremely brittle. Under operating pressures, sea sand fractures, creating fine particles that obstruct capillaries in the spinnerets. Furthermore, sea sand has a low specific surface area and low porosity, causing pack pressure to increase rapidly.
Our stainless metal powder is processed under specific conditions to yield an extremely irregular surface structure. This irregular geometry provides low apparent density and enhances filtration efficiency. Under high operational pressures, it maintains its porous structure and exhibits superior resistance to compressibility with little or no particle deformation.
Type & Element Composition of Stainless Steel Powder
We provide various grades tailored to your specific pressure and yarn requirements:
| Type | Fe (%) | Ni (%) | Cr (%) | Mn (%) | Si (%) | Mo (%) | C (%) | Applications |
|---|---|---|---|---|---|---|---|---|
| F-01 | Balance | Max 0.6 | 16 - 18 | Max 1.0 | 1.0 - 4.0 | - | Max 0.12 | Economic metal powder |
| S-03 | Balance | 6 - 12 | 16 - 22 | Max 1.0 | 0.6 - 3.5 | Max 3.0 | Max 0.12 | Standard media for POY/FDY filament spinning |
| S-04 | Balance | Max 0.6 | 33 - 37 | Max 1.0 | 2.0 - 4.0 | - | Max 0.12 | High-end media with enhanced compressibility resistance (PA filament spinning) |
Available Mesh Sizes & Physical Properties (ISO 4497 Standard)
During filament spinning, combining different powder sizes is critical to achieve the optimal filtration gradient. Below is the list of sizes available according to ISO 4497 international standards for metallic powders:
| Size (micron) | Size (mesh) | Apparent Density (g/cm³) | Tap Density (g/cm³) | Porosity (%) |
|---|---|---|---|---|
| 850 / 2000 | 10 / 20 | 1.45 | 1.95 | 75 |
| 500 / 850 | 20 / 30 | 1.55 | 2.10 | 73 |
| 350 / 500 | 30 / 40 | 1.60 | 2.10 | 71 |
| 250 / 350 | 40 / 60 | 1.65 | 2.60 | 67 |
| 180 / 250 | 60 / 80 | 1.80 | 2.70 | 65 |
| 150 / 180 | 80 / 100 | 2.00 | 2.90 | 62 |
| 125 / 150 | 100 / 120 | 2.22 | 3.10 | 58 |
| 90 / 125 | 120 / 170 | 2.50 | 3.20 | 56 |
* Any other custom sizes can be manufactured upon request.
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