Manufacture of leather by Rogers Allen 1876-1938

Author:Rogers, Allen, 1876-1938. [from old catalog]
Language: eng
Format: epub, pdf
Tags: Leather industry and trade. [from old catalog], Tanning. [from old catalog]
Publisher: Scranton, Pa., International textbook company
Published: 1922-03-25T05:00:00+00:00

MANUFACTURE OF LEATHER, PART 2

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stunac and similar materials by varying the method of operation. In using this extractor, the stem e is connected to a copper or glass flask and the cap J to a condenser. The cock / and side openings k and / are closed. The material is weighed or washed in after covering the perforated plate at the bottom with a thin layer of cotton or filter paper, and then thoroughly moistened. A liter of water is placed in the flask, the apparatus connected up with the flask and the condenser, and heat applied to the bottom of the reservoir. The lower side opening k is opened, and the first portions of the extractives are collected there. After the strong extractives have been removed, the side opening is closed and the cock / opened, and a cumulative extraction continued until extraction is complete.

29. In extracting sumac and similar materials, which must have a cooler initial extraction temperatures, the cap can be left off and water at the desired temperature allowed to drip on the material, collecting extractives at either side opening. When the strong portions have been removed, the cap is replaced, connected with the condenser, the side openings closed, the cock/ opened, and the extraction completed with steam from the flask connected to the stem e. The materials mentioned may also be extracted by covering them with cold water almost to the level of the upper side opening, connecting with condenser and reservoir, boiling the water in the reservoir slowly, and collecting the first portions at the upper side opening /.

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