Spunbonded nonwoven fabric and filter using same
The purpose of the present invention is to obtain a spunbonded nonwoven fabric, which comprises a single-component polyester-based fibers, having a high basis weight and a high rigidity by embossing, which is difficult to attain in the conventional art. Further, the present invention provides a filter base material having excellent pleatability, pleat retention property and durability, and a filter using thereof. The present spunbonded nonwoven fabric is obtained by subjecting a deposited fiber assembly to a thermocompression bonding by embossing with a pair of an embossing roll and a flat metal roll, and has a basis weight of 150 to 400 g/m 2 , a longitudinal bending repulsion of 20 to 60 mN and a longitudinal tensile strength of 400 N/5 cm or more.
1. A spunbonded nonwoven fabric having
a basis weight of 150 to 400 g/m 2 ,
a longitudinal bending repulsion of 20 to 60 mN, and
a longitudinal tensile strength of 400 N/5 cm or more,
wherein the spunbonded nonwoven fabric comprises single-component polyester-based fibers.
2. The spunbonded nonwoven fabric according to claim 1 , wherein the polyester-based fibers are fibers made of a mixture containing 98.0 to 99.95% by weight of a polyester-based resin (A component) having a glass transition temperature of 60° C. or higher and 0.05 to 2.0 wt % of a thermoplastic resin (B component) incompatible with the polyester-based resin (A component) and having a glass transition temperature of 120° C. to 160° C.
3. The spunbonded nonwoven fabric according to claim 2 , wherein the A component is polyethylene terephthalate and the B component is a styrene-methyl methacrylate-maleic anhydride copolymer or a styrene-maleic acid copolymer.
4. The spunbonded nonwoven fabric according to claim 1 , wherein the fibers constituting the nonwoven fabric are filaments each having a birefringence of 0.04 to 0.09 and a fineness of 1 to 5 dtex.
5. A filter base material comprising the spunbonded nonwoven fabric according to claim 1 .
6. A filter base material comprising the spunbonded nonwoven fabric according to claim 1 , wherein the filter base material has a collection efficiency of 25% or more for particles with a size of 0.3 μm or more and 0.3 μm or less and a QF value of 0.03 mmAq −1 or more, regarding a filtration property when being used in the form of a nonwoven fiber single-plate.
7. The filter base material according to claim 5 , wherein the filter base material is subjected to pleating.
8. The filter base material according to claim 6 , wherein the filter base material is subjected to pleating.
9. The spunbonded nonwoven fabric according to claim 2 , wherein the fibers constituting the nonwoven fabric are filaments each having a birefringence of 0.04 to 0.09 and a fineness of 1 to 5 dtex.
10. The spunbonded nonwoven fabric according to claim 3 , wherein the fibers constituting the nonwoven fabric are filaments each having a birefringence of 0.04 to 0.09 and a fineness of 1 to 5 dtex.
11. A filter comprising the filter base material according to claim 5 .
12. A filter comprising the filter base material according to claim 6 .
13. A filter comprising the filter base material according to claim 7 .
14. A filter comprising the filter base material according to claim 8 .
15. The spunbonded nonwoven fabric according to claim 1 , wherein the single-component polyester-based fibers are obtained by a process comprising melting and spinning a mixture containing a polyester-based resin (A component) having a glass transition temperature of 60° C. or higher and a thermoplastic resin (B component) incompatible with the polyester-based resin (A component) and having a glass transition temperature of 120° C. to 160° C. to form a web.
16. The spunbonded nonwoven fabric according to claim 15 , wherein the process further comprises compressing the web with a compression roller and embossing the web with an embossing roller and a flat metal roller.