Dust buster filter for a vacuum cleaner

摘要

A dust buster filter for a vacuum cleaner made up of three layers of unwoven cloth having their circumfertical edges fused together with plastic rings by means of a super-sonic fusing machine and a dirt entrance joined with the upper layer of unwoven cloth with glue. The dirt entrance is provided with four protrusions fitting into glued with four holes in the upper layer of unwoven cloth.