| 摘要 |
A filter is provided for coalescing droplets of oil in a stream of gas, comprising an oil coalescing layer of a microfibrous material, such as borosilicate glass microfibres, and a second layer of an oil drainage material located downstream of and in face to face contact with the first layer. The drainage layer receives oil from the coalescing layer and provides a path for oil to flow by gravity from the filter. The drainage layer is comprised of 85-90% non-woven felt or wadding material such as polyester fibres, and 10-15% of fibres which are wholly or partly fusible, such as bi-component thermally bondable polyester fibres. The outer sheath of the bi-component fibres melts at 120-150‹C whereas the core of the fibres melts above about 200‹C. The fibres may be of the same composition as those of the felt material or of a different composition. The drainage layer may incorporate a dye pigment for identification purposes. Preferably the filter can be operated at temperatures above 60‹C.
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