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This invention relates to a nonwoven fabric for filters, in which a melt blown nonwoven fabric formed of polybutylene terephthalate or polypropylene terephthalate fibers with an average fiber diameter of 1 to 8 μm and a spunbonded nonwoven fabric formed of polyester-based fibers with an average fibe

This invention relates to a nonwoven fabric for filters, in which a melt blown nonwoven fabric formed of polybutylene terephthalate or polypropylene terephthalate fibers with an average fiber diameter of 1 to 8 μm and a spunbonded nonwoven fabric formed of polyester-based fibers with an average fiber diameter of 10 to 30 μcm are laminated for integration.

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1. A nonwoven fabric for filters in which a melt blown nonwoven fabric formed of fibers with an average fiber diameter of 1-8 μm and a spunbonded nonwoven fabric formed of core-sheath fibers with an average fiber diameter of 10 to 30 μm are laminated for integration, wherein the fibers of the melt b

1. A nonwoven fabric for filters in which a melt blown nonwoven fabric formed of fibers with an average fiber diameter of 1-8 μm and a spunbonded nonwoven fabric formed of core-sheath fibers with an average fiber diameter of 10 to 30 μm are laminated for integration, wherein the fibers of the melt blown nonwoven fabric and a sheath component of the core-sheath fibers of the spunbonded nonwoven fabric contain polybutylene terephthalate while a core component of the core-sheath fibers of the spunbonded nonwoven fabric contains polyethylene terephthalate, wherein the polymer composition of the sheath component of the core-sheath fibers of the spunbonded nonwoven fabric is the same as the polymer composition of the fibers of the melt blown nonwoven fabric. 2. A nonwoven fabric for filters, according to claim 1, wherein an integral lamination interface between the melt blown nonwoven fabric and the spunbonded nonwoven fabric has thermally compressed portions and a compressed area rate of the thermally compressed portions is 3 to 50%. 3. A nonwoven fabric for filters, according to claim 1, wherein an entire unit area weight of the nonwoven fabric formed by the integral lamination is 80 to 300 g/m2, and a rate by weight of the melt blown nonwoven fabric based on the entire unit area weight is 3 to 60%. 4. A nonwoven fabric for filters, according to claim 1, wherein a collection efficiency of polystyrene dust with a particle size of 0.3 to 0.5 μm is 50 to 100%. 5. A nonwoven fabric for filters, according to claim 1, which is pleated. 6. A nonwoven fabric for filters, according to claim 5, wherein the filters are industrial filters. 7. A nonwoven fabric for filters, according to claim 1, wherein the fibers of the melt blown nonwoven fabric and a sheath component of the core-sheath fibers of the spunbonded nonwoven fabric consist essentially of polybutylene terephthalate.