Textiles for commercial industrial and domestic arts schools also adapted to those engaged in wholesale and retail dry goods wool cotton and dressmaker s trades

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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: one purely mechanical, the other chemical, and known respectively as burring and carbonizing. Bur Picker. For the mechanical removing of burs a machine called the bur picker is employed. In this machine the wool is first spread out into a thin lap or sheet; then light wooden blades, rotating rapidly, beat upon every part of the sheet and break the burs into pieces. The pieces fall down into the dust box or upon a grating beneath the machine, and are ejected together with a good deal of the wool adhering to them. Often the machine fails to beat out fine pieces and these are scattered through the stock. Process of Carbonizing. For the complete removal of all foreign vegetable substances from wool the most effective process is carbonizing, in which the burs, etc., are burned out by means of acid and a high degree of heat. The method of procedure is as follows: The wool to be treated is immersed in a solution of sulphuric or hydrochloric acid for about twelve hours, the acid bath being placed in cement cisterns or in large lead-lined tubs and not made strong enough to injure the fiber of the wool. During the immersion the stock is frequently stirred. Next, the wool is dried and then placed in an enclosed chamber and subjected to a high temperature (75 degrees C.). The result of this process is that all the vegetable matter contained in the wool is " carbonized " or burned to a crisp, and on being slightly beaten or shaken readily turns to dust. This dust is removed from the wool by various simple processes. The carbonizing process was first introducedin 1875, though it made but slight headway against the old burring method until after 1880. Blending. Pure wool of but one quality is not often used in the production of woven fabrics, so, before the raw material is ready for spi...

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Oorspronkelijke releasedatum: 06 december 2012

Aantal pagina's: 300

Hoofdauteur: William H (William Henry) Dooley

Hoofduitgeverij: Tredition Classics

Product breedte: 127 mm

Product hoogte: 18 mm

Product lengte: 203 mm

Verpakking breedte: 127 mm

Verpakking hoogte: 18 mm

Verpakking lengte: 203 mm

Verpakkingsgewicht: 422 g

EAN: 9783849182663

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