Document 2qzgYbQ80G0jQqxB99wKDBE6r

Prolininary Duot Survey for Aobcotoa Textile Institute, Juno, 1947 .11 Weaving One plant has a oupcrlor method of suppreaalng duot in veaving by vet cothcdo and. dust count records Indies to a complete suppression of dust. 1 I - It involves a water epra7 hcao counted above the varp at-the reer of the harness with a mechanical ocrev srrangemsnt for constant povecent of the spray bead transversely to tho varp. They believe it to be acre effective than the oy0tea cosaon in several plants vhereln the varp is passed over vetted rolls. It la apparently not practical to recommend 100 per cent vet vcavir.3 throughout the Industry. Moreover, vo are satisfied that it is practical to control dust in this operotlon by local exhaust, vhcrc dry weaving is consider- * ed irxerativefor special properties of the cloth. One ot the best exhaust arrangements Includes an exhaust opening directly under the varp ct the rear of tho harness frees vith a slot exhaust opening carried by the lay heart, the letter connected to the stationery pert of tho exhaust system, either by floxlblc hose axrangeccht or by an ell metal swivel joint. Duct Work.. The actual arrangement of duct work and exhaust fan present no un usual problems vhere good practice in sheet metal fabrication is followed. Two points are of sufficient importance to require cnphasls. . Special care should he exercised in the fabrication to avoid sharp projections on the inside that crcato points of lodgement for fibers. Soeondly, it must bo designed to pro vide adequate transporting velocities. Velocities below 2000 fpa, in the experience of tho industry, oay permit settlement of matorial and gradual clogging. Therefore, allowing a tnrgin of oafety, tho deoign should provide for velocities of 3000 fpa. MTS 007902