New Textile Machinery

1876 Scientific American  
Cellulose. Dr. Mitscherlich, of Darmstadt, lias devised a method of making paper stock (cellulose) from wood by a chemical pro ce3S, which differs somewhat from those previously in use. The chi!'f peculiarity of this process, which is in use already in PI ' us8ia and Saxony, says the Hesse Ge1oe1'ooblfltt, consists in thill, that the incrusting substance of the wood is not de stro�'ed, but only seplIl'at.ed from t.lle ce11nlose, and eventually rcmlerecl soluble. 111 1hit-vroceSIl, it is not
more » ... "Hury to ('ut t.hl' wood up very fine, liS in the Sinclair proCtlf'ls, hut only to split it up like ordinary firewood for a parlor stO\'e, A chemically prepared solution of lime is boiled for six hours with the wood under 8, pressure of 3 at mospher€'s. lifter the boiling, a portion of the incrnsting material is found dissolved in the liquor, and part of it in the porAs of the wood, from whit�h it is extracted hy a suitable sq ue!'zing ap paratuR. If it is dellired to make u very valuable pllper stock, which shall be as white as possible without bleaching, they only !'mploy whitl' wood 11K free from rosin as possihl!', Uk!' pop lur, linden, etc. TheHe ldnds of wood are not decolol'ized :my farther in this 1'rocl'SS, and the alhuminoid and gummy substances ar!' n lOlltly disRolved. The Ruccess of this vro cess depends less on tile l lressure during hoiling than 011 t,he temperatur!', whidl must not exceed 248" Full.
doi:10.1038/scientificamerican07151876-41c fatcat:wejof45aqbd7nepryz62tlh54q