Air filter material using laminated electret nonwoven fabric

摘要

Present invention provides an air filter material using a laminated electret nonwoven fabric subjected to electret processing in which one layer or a plurality of layers of nonwoven fabrics (referred to as nonwoven fabric B) including fibers having a mean fiber diameter in the range of 10 micrometers to 100 micrometers and being larger than a mean fiber diameter of fibers constituting nonwoven fabric A are laminated on at least one side of a nonwoven fabric (referred to as nonwoven fabric A) obtained by mixing two kinds of fibers having a mean fiber diameter in the range of 0.1 micrometer to 15 micrometers and having a different melting point (fibers having a lower melting point are defined as fibers D and fibers having a higher melting point are defined as fibers E), and a laminated electret filter material having a low pressure loss and a high collection efficiency. The filter material is suitably used for a medical mask, an industrial mask, a general purpose mask or the like.

主权项

1. An air filter material, comprising:
a laminated electret nonwoven fabric subjected to electret processing used for a laminated nonwoven fabric, the laminated electret nonwoven fabric comprising:
a nonwoven fabric A including mixed fibers containing fibers D and fibers E, the fibers D and the fibers E having a mean fiber diameter in the range of 0.1 micrometer to 15 micrometers and having a different melting point, the fibers D having a lower melting point, the fibers E having a higher melting point; andone layer or a plurality of layers of nonwoven fabric B laminated on at least one side of the nonwoven fabric A, the nonwoven fabric B including fibers having a mean fiber diameter in the range of 10 micrometers to 100 micrometers and being larger than a mean fiber diameter of the fibers constituting the nonwoven fabric A, wherein a difference (b minus d) is 20° C. or more when the melting point of the fibers D constituting the nonwoven fabric A is defined as d (° C.), a melting point of a fiber structure component having a lowest melting point among fiber structure components that constitute at least a part of a surface of the fibers constituting the nonwoven fabric B is defined as b (° C.).