Document mmxz0G8GK1yyKOmozOjNpn2zO

Preliminary Dust Survey for Asbestos textile Institute, June, 39^7 11. Veaving One plant bee a superior method of suppressing dust In weaving by vet methods and dust count records Indicate a couplets suppression of dust. It Involves a water spray bead mounted above the warp'at the rear of the harness with a mechanical screw arrangement for constant movement of the spray head transversely to the warp. They believe It to be more effective than the system ccmson in Beveral plants wherein the warp is passed-over wetted rolls* It is apparently not practical to reocbsoend 100 per cent wet weaving throughout the Industry, Moreover, we are' satisfied that it is practical to control dust In thlB operation by local exhaust, where dry weaving is consider ed imporatdLvefor special properties of the cloth. Ons of the best exhaust arrangements Includes an exhaust opening directly under-the warp at the rear of the harness frame with a slot exhaust opening, carried by the lay beam, the latter connected to the stationary part of the exhaust system, either by flexible hose arrangement or by an all metal swivel joint. Duct Work The actual arrangement of duct work and exhaust fan present no un usual problems where good practice in sheet metal fabrication is followed, ten points are of sufficient Importance to require emphasis. Special care should be exercised in the fabrication to avoid sharp projections on the inside that create points of lodgement for fibers. Secondly, it must be deeigned to pro- .* ** . vide adequate transporting velocities. Velocities below 2000 fjm, .in the experience of tbs Industry, may permit settlement of material and gradual cloggings therefore, allowing a margin of safety, the design should.provide for velocities of 3000 fpa. i i j t I ; j | i \