Method to form a dust collecting layer on a porous body without using a binder

Abstract

The present invention provides a method for producing a filter element that does not have any peeling of fine particles constituting a dust collection layer, and maintains high performance for long periods of time even when scaled up. The method includes depositing to form a layer of fine particles including low melting fine particles and small diameter fine particles, on a surface of a filter element material while suctioning the filter element material, and heating the layer of the fine particles by using a heater such as an infrared heater or an oven to sinter the fine particles to form the dust collection layer.

Dependencies are inferred from the claim text.