Filter unit for a dirt sucking apparatus

摘要

The filter layer (10) and the support layer (11) consist of polyester material, while the connection piece consists of plastic. The adhesion points between the connection piece (3) and the filter bag (2) use a water-resistant adhesive. The filter and support layer water porosity is such that 10 cm<3> under a constant 200mm pressure head results in 100 cm<3> water passing through in 10 seconds. A filter unit for a dirt sucking apparatus comprises a filter bag with a multilayered wall. The wall consists of a fine fiber fleece filter made of plastic, an outer protective layer made of a plastic fiber fleece with a larger air porosity, and a connection piece which is adhered to the outside of the bag.