作者: Daniel T. Risch , Wayne M. Wagner , Francis A. Friedmann
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摘要: The present invention relates to a filter including element having sucession of inner connected pleats. pleats have successive pleat tips which define an outer boundary the element. Covering entire is permeable generally inelastic sheet extends across tips. adhesively affixed for maintaining spacing comprises plurality randomly arranged plastic filaments are bonded each other junctions between and spaced shaped opening allowing substantially unrestricted flow fluid through sheet.