Method for the improvement of the separation efficiency of fine filter mats, which are used for fine filtration of air for clean rooms/dye spray cabins, comprises arranging coated fibers at the ceiling of clean room/in dye spray cabins

摘要

The method for the improvement of the separation efficiency of fine filter mats, which are used for fine filtration of air for clean rooms/dye spray cabins, comprises arranging coated fibers at the ceiling of clean room/in dye spray cabins (4) compacted in a support framework and flowing coated fibers through the air to be filtered in vertical flow direction. The coated fibers are held or rather carried by support grids (9) that protect against the differential pressure that is caused by the flow resistance. A number of appropriate measures of a known type are taken for damping vibrations. The method for the improvement of the separation efficiency of fine filter mats, which are used for fine filtration of air for clean rooms/dye spray cabins, comprises arranging coated fibers at the ceiling of clean room/in dye spray cabins (4) compacted in a support framework and flowing the coated fibers through the air to be filtered in vertical flow direction. The coated fibers are held or rather carried by support grids (9) that protect against the differential pressure that is caused by the flow resistance. A number of appropriate measures of a known type is taken for damping vibrations, including sound vibrations or infra- or ultrasonic vibrations, which originate from the cabin housing of the support grids or the support framework that carries the filter mats. At the clean gas side or the bottom side of the mats, a vibration-damping knitted fabric that is composed of mono-filamentous plastic yarns and woven like a mesh in a known form is attached in such a manner that the knitted fabric lies below the filter mat and above the support grids. The support grids are integrated between fiber layers of the fine filter mat that adhere to one another. Each support grid is arranged with its upper surface at the external dust side of the filter mat and is connected with the underlying fiber layers of the fine filter mat that adhere to one another by point-like tear seam connection that is arranged at regular intervals and carries the filter mat. A second knitted fabric that is made of mono-filamentous plastic yarns that are woven like a mesh is arranged below the vibration-dampening knitted fabric. The plastic support bars are inserted through meshes of the knitted fabric at intervals of 3-10 cm transverse to the length of the filter. The support grid lies upon the lower support framework and carries the layers composed of the filter mat, upper vibration-dampening knitted fabric and the basal knitted fabric. The knitted fabric lying in contact with the filter mat is adhesively bonded with the lower fiber ply of the filter mat at all points of contact. The knitted fabrics are clamped in a sealing manner together with the filter mats at the peripheral margins in the support framework using soft vibration-dampening sealing strips that are composed of closed-porous foam material. The fine filter mats are sewn together with the integrated support grid in a point-wise manner. The support grids are made up of plastic.