Nesting in a metal filter is reduced by using a variable opening pitch expanded metal sheet having different spacings between adjacent rows of openings. Such a filter is made by varying the rate at which the sheet is fed through the equipment, the rate of ...

A method for fabricating a filtering member in which overlapping portions of a wire are bonded together in a layered manner through thermal treatment for forming a mesh is disclosed. In accordance with the method, a contact surface pressure between portion...