Filter formed from corrugated and flat sheets

摘要: 1,213,219. Filter element. MINE SAFETY APPLIANCES CO. 19 June, 1968, No. 29258/ 68. Heading B1D. A filter element comprises a stack of units the form illustrated, which may be cut from length similar structure, each unit comprising section corrugated filtering sheet 1 with flat sheets 2, 3 secured to opposite sides and extending inwards edges thereof, at passages formed between respective are closed. Sheets extend just over half way across sheets, in adjacent overlap sealed together (Figs. 3, not shown). Fig. 4 (not shown) illustrates more elaborate two separated by full-width (15) having half-width on their outer sides. The common peripheral frame.