Leather manufacture : a practical handbook of tanning, currying, and chrome leather dressing by Watt Alexander

Author:Watt, Alexander
Language: eng
Format: epub, pdf
Tags: Leather
Publisher: London : Crosby Lockwood ; New York : Van Nostrand
Published: 1906-03-25T05:00:00+00:00

forcibly scraped, or scudded, as it is termed, with a blunt two-handled knife, both on the grain and flesh side, by which the remaining lime and albuminous matters are forced out of the pelt. They are then again steeped for a short time, and the effect of the various operations to which they have been submitted is that the pores of the skins are opened and free from all such matters as would prevent the proper absorption of the tanning principle.

Sumac Tanning. — The peculiar nature of this tanning material, which is of a yellow colour, renders it necessary to apply it in such a way that its action upon the pelts shall be perfectly uniform, a result which would not be attained if the skins were immersed in an infusion of the material in the same way as in ordinary bark tanning. In order, therefore, to insure perfect uniformity in the action of the sumac tannin, the following system is adopted :— The pelts, after passing through the various operations above described, are transferred to an apartment in which they are sewn up into bags by women — each skin forming a bag— with the grain side outward, a small opening at the hinder part only being left for the introduction of a funnel. At Messrs. Bevingtons' Bermondsey wo'ks these bags are now made by the sewing-machine. When the bags are made they are thrown into a vessel of water and examined to ascertain if they are properly sewn and free from holes. They are next taken to the sumac tub, which is a large shallow vessel about fifteen feet in diameter, and which is filled with hot water containing a little sumac. Close to this tub is a smaller vessel containing a strong solution of sumac.

The method of filling the bags with the stronger solution is as follows, and is performed by two men and a boy. Taking their places by the side of the smaller tub, the lad takes one of the bags and inserts the neck of a funnel in its opening, when one of the workmen nearly fills the bag through the funnel with the strong sumac solution by means of a ladle (Fig. 50). The second man then takes the bag from the funnel and inflates it with his breath, after which he closes the aperture by tying it

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