Page:Willich, A. F. M. - The Domestic Encyclopædia (Vol. 3, 1802).djvu/360

338&#93; 33S] ^ A P I, Process for re-fahrlcatlng Printed Paper : — All paper of tiie same quality should be collciStcd, and separated from such as may- have any writing on the pages ; the edges of (hose leaves which may have beconne yellow, and also the backs of books, being cut off by the instrument used by book- binders. — One hundred weight of paper is now to be put, sheet by sheet, into vats, sufficiently capa- cious to contain it, together with 500 quarts of hot water; but which ought to be filled about one-third : —the whole is next stirred by two men for the space of one hour, who are gradually to add as much water as will rise about three inches above the paper ; after which it is ]eft to macerate four or five hours ; the agitation being occasionally re- peated, so as to separate, and at length to form the paper into a kind of paste. The water is now drawn off by means of pipes, and the pulp con- veyed to the mUl, where it is to be coarsely ground for one hour ; at the expiration of which, it is boiled in a cauldron for a similar space, ivith a sufficient quantity of water to rise four or live inches above it. A short time before the mixture begins to boil, thirteen quarts of caustic ley of pot-ash are to be add- ed to every cwt. oi paper. The It-y alluded to, is prepared by dis- solving lOOlbs. of pot-ash in 300 quarts of boiling water, to which are to be added 20 lbs. of pulve- rized quick-lime ; and the whole must be briskly agitated, till it be- come of an uniform consistence, when it is suffered to stand for 12 hours ; at the end of this time it must be drawn off, and "^5 quarts of boiling water ;idded to the sedi- nicnt^ which being stirred for half PAP an hour, and suffered to sLmd till it become clear, is to be mixed with the liquor first decanted. When the paste has boiled in this ley for one hour, the fire is to be extinguished, and the matter suffered to macerate for 12 hours ; after which it must be taken out, drained, put into bags, and sub- mitted to the a61;ion of a strong press for a similar length of time, to deprive it of all moisture ; and, if it appear white, so that the prin- ter's ink be properly extra6ted, it may be re-manufai5tured in the usual manner. JI. Process for there-falricathn of JfYitten Paper : — The paper must be sorted ; the yellow edges cut off ; and the whole thrown, leaf by leaf, into a tub half-full of boiling water, where it is to be agitated as before direfted. After it has macerated four hours, the water should be drawn off j a fresh quantity of boiling water added ; and the mixture stirred for half an hour ; at the expiration of which the paper is again left to dissolve for three hours. The fluid is now drawn off, and 260 quarts of cold water poured on each cwt. of paper ; which be- ing perfectly mixed, 6 lbs. of oil of vitriol are to be gradually added j and th.; w hole strongly agitated for a considerable time, that the paper may thoroughly imbibe the liquor. This composition is next suffer- ed to macerate for twelve hours ; the agitation being occasionally re- peated, when the tub is to be filled up with cold water ; and the mi.- ture again stirred, to wash the paper, which will now be reduced to a perfect paste. Lastly, after drawing off the water, the pulp must be put into bags, pressed, and ground in a mill : after which it