| 摘要 |
<p>Filter element in the so-called cassette format consists of a square carrier, made of cardboard, which is made in one piece with the folded outer flanges and has perforations, such as triangular holes sepd. by webs, on the inside. The surfaces towards the dust laden side are coated with an adhesive layer for the filter layer. The filter layer consists of a coarse grating in a linen lacing on the outside towards the dust laden gases, followed by a thick glass fibre mat and a thin double layer of glass fibre roving. The element can be produced at low cost and is free from vibratory effects. It can be easily disposed of by burning.</p> |
