Filter medium, fluid filter, and engine oil filter
View Patent ↗A filter medium comprises a modified cross-section fiber (A) having a fiber diameter between 40 and 70 μm, an extremely fine fiber (B) having a fiber diameter of more than 5 μm and no more than 10 μm and a modified cross-section fiber (C) having a fiber diameter between 15 and 30 μm, the content of the extremely fine fiber (B) is between 3 and 10% by mass, and the content of the modified cross-section fiber (C) is between 5 and 15% by mass based on 100% by mass of total the fibers in the filter medium.
1. A filter medium comprising:
a modified cross-section fiber (A) having a fiber diameter between 40 and 70 μm;
an extremely fine fiber (B) having a fiber diameter of more than 5 μm and no more than 10 μm; and
a modified cross-section fiber (C) having a fiber diameter between 15 and 30 μm;
wherein the content of said extremely fine fiber (B) is between 3 and 10% by mass, and the content of said modified cross-section fiber (C) is between 5 and 15% by mass based on 100% by mass of total said fibers in said filter medium.
2. The filter medium according to claim 1 , wherein said fiber diameter of said modified cross-section fiber (C) is more than 3 times and less than 6 times said fiber diameter of said extremely fine fiber (B).
3. The filter medium according to claim 1 , wherein said fiber diameter of said modified cross-section fiber (C) is more than ⅕ times and no more than ¾ times said fiber diameter of said modified cross-section fiber (A).
4. The filter medium according to claim 2 , wherein said fiber diameter of said modified cross-section fiber (C) is more than ⅕ times and no more than ¾ times said fiber diameter of said modified cross-section fiber (A).
5. The filter medium according to claim 1 , wherein the content of said modified cross-section fiber (A) is between 10 and 30% by mass based on 100% by mass of total said fibers in said filter medium.
6. The filter medium according to claim 1 , wherein at least one of said modified cross-section fibers (A) and (C) is a hydrophilic fiber.
7. A fluid filter comprising a filter medium,
said filter medium comprising:
a modified cross-section fiber (A) having a fiber diameter between 40 and 70 μm;
an extremely fine fiber (B) having a fiber diameter of more than 5 μm and no more than 10 μm; and
a modified cross-section fiber (C) having a fiber diameter between 15 and 30 μm;
wherein the content of said extremely fine fiber (B) is between 3 and 10% by mass, and the content of said modified cross-section fiber (C) is between 5 and 15% by mass based on 100% by mass of total said fibers in said filter medium.
8. The fluid filter according to claim 7 , wherein said fiber diameter of said modified cross-section fiber (C) is more than 3 times and less than 6 times said fiber diameter of said extremely fine fiber (B).
9. The fluid filter according to claim 7 , wherein said fiber diameter of said modified cross-section fiber (C) is more than ⅕ times and no more than ¾ times said fiber diameter of said modified cross-section fiber (A).
10. The fluid filter according to claim 8 , wherein said fiber diameter of said modified cross-section fiber (C) is more than ⅕ times and no more than ¾ times said fiber diameter of said modified cross-section fiber (A).
11. The fluid filter according to claim 7 , wherein the content of said modified cross-section fiber (A) is between 10 and 30% by mass based on 100% by mass of total said fibers in said filter medium.
12. The fluid filter according to claim 7 , wherein at least one of said modified cross-section fibers (A) and (C) is a hydrophilic fiber.
13. A engine oil filter comprising a filter medium,
said filter medium comprising:
a modified cross-section fiber (A) having a fiber diameter between 40 and 70 μm;
an extremely fine fiber (B) having a fiber diameter of more than 5 μm and no more than 10 μm; and
a modified cross-section fiber (C) having a fiber diameter between 15 and 30 μm;
wherein the content of said extremely fine fiber (B) is between 3 and 10% by mass, and the content of said modified cross-section fiber (C) is between 5 and 15% by mass based on 100% by mass of total said fibers in said filter medium.
14. The engine oil filter according to claim 13 , wherein said fiber diameter of said modified cross-section fiber (C) is more than 3 times and less than 6 times said fiber diameter of said extremely fine fiber (B).
15. The engine oil filter according to claim 13 , wherein said fiber diameter of said modified cross-section fiber (C) is more than ⅕ times and no more than ¾ times said fiber diameter of said modified cross-section fiber (A).
16. The engine oil filter according to claim 14 , wherein said fiber diameter of said modified cross-section fiber (C) is more than ⅕ times and no more than ¾ times said fiber diameter of said modified cross-section fiber (A).
17. The engine oil filter according to claim 13 , wherein the content of said modified cross-section fiber (A) is between 10 and 30% by mass based on 100% by mass of total said fibers in said filter medium.
18. The engine oil filter according to claim 13 , wherein at least one of said modified cross-section fibers (A) and (C) is a hydrophilic fiber.