This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...into a screen extreme care should be taken to see that they fit perfectly on the wooden sills of the screen body. Every screw should be driven home so that the plate will lie perfectly flat and be perfectly water-tight all around the edges. Where the sills have become worn, a thin sheet packing or gasket is sometimes ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...into a screen extreme care should be taken to see that they fit perfectly on the wooden sills of the screen body. Every screw should be driven home so that the plate will lie perfectly flat and be perfectly water-tight all around the edges. Where the sills have become worn, a thin sheet packing or gasket is sometimes used. The continued use of a screen vat necessitates screen plates being taken out and put in, time after time. The screws go back into the same hole every time, on account of the holes being drilled through the plate by a template. The holes in the sills will finally become so worn that the plates will rise or unseat every time there is an upward stroke of the diaphragm, thus letting through an immense amount of dirt. The only cure for this worn condition of the sills is to renew them. Sometimes as a temporary makeshift, the holes can be plugged, but this it not generally recommended. There are several screwless screen plate fasteners on the market. These have devices by which the plates can be clamped down and fastened in tightly without screw holes. The Witham Screwless Screen Plate Fastener is typical of these devices. The plates are beveled, and beveled cleats of special form hold them in position, obviating the use of screws, entirely. Another point in connection with screens, worthy of consideration, is that the upper part of the screen body, carrying the plates, should always be carefully screwed or clamped to the screen vat and packing used to prevent this joint from leaking stock. The screens are sometimes placed in such a manner that it is hard for Courtesy: Union Sereen Plate Co., Fitchburg, Mass. Fig. 115.--Vat of diaphragm screen showing Witham screwless screen plate fastener. the workmen to get at the clamps to unscrew them, and ...
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Add this copy of Modern Pulp and Paper Making-a Practical Treatise to cart. $35.00, good condition, Sold by T A Borden Books rated 4.0 out of 5 stars, ships from Olney, MD, UNITED STATES, published 1920 by Chemical Catalog Co..
