BigPatents India

A disposable vacuum filter bad is constructed of layers, which include a high air permeability first layer positioned upstream in the direction of airflow of a second filtration layer. The second filtration layer can be a wet-laid filter paper, a dry-laid filter paper or a spunbond nonwoven. The first layer can be made of high bulk melt blown nonwoven, dry-laid or wet laid high dust holding capacity paper spun blown modular or microdenier spunbond. The high dust capacity papers are characterized by greater thickness and higher air permeability than is normally used in traditional filter layers of vacuum cleaner bag structures. (FIG.1)