DE349813C - Process to increase the cutting ability of wood, especially for pencil production - Google Patents

Description

Process for increasing the cutting ability of wood, in particular for pencil production: it is known the workability of wood to increase technical products by putting them under cold pressure impregnated with sulfites or dithionates or with solutions of alkalis. and it. then heated on its own at a temperature of between 10 and 1.5 ° C. It is Feirner known to subject wood to a treatment with acids and it afterwards with a water-repellent oil, such as B. with paraffin oil to soak. Even it is not new to the wood preservation industry to use wood for inclusion to make tar oil suitable as a preservative in the freshly felled state in a known manner in a pressure vessel of a pretreatment finitely stressed - water vapor then subject it to a sudden release of pressure so as to do so to enable impregnation. -These - known methods are useful, though one works exactly according to the known gervordenen regulations, to increase the ability to cut wood, especially not for pencil production, because they do not lead to any useful results. .

The invention relates to a method of increasing cutting ability of woods in general, `the one especially suitable for making pencils Timber supplies. According to this process, wood is pretreated in a pressure vessel with pressurized steam in the in the wood preservation industry - for impregnation normal travel, but in the presence of very small amounts of alkaline additives or acidic nature or in combination with additives dissociable bodies, which the wood can also be added alone, unlocked. Through the apparently hydrolvtischeW @rkung of these additives in * very small amounts as well as through the action of the high Temperatures arising from dissociation and therefore acting in the nascendi status Acids or. Alkalis takes place the dissolving out of the incrusting; @; Nouns as well as the resolution of the nodes of the medullary ray cells and the. subsequent Wood preinchyms in a previously unknown extensive 1 cup. Then that will wood that has been opened up with the usual paraffin impregnation in the preservation industry known way by soaking in baths of highly heated, over: 200 ° C boiling Oils such as paraffin, linseed oil, stearic acid and the like. Like., subjected, according to the invention get those dyes added that are in your concerned highly heated Oils soluble and the. are necessary to achieve the desired color nuances. Just because of that it is also possible; -your wood any color, like yellow, red, blue, green or black, to give.

At the end of these treatments, the wood is riveted using the well-known method dried.

Claims (2)

PATENT CLAIMS: - -r. Process to increase cutting ability of wood, especially for pencil making, using alkalis or mineral acids, characterized in that wood with these agents, optionally with the addition of dissociable bodies, such as ammonium salts, in a known manner in one Pressure vessel for the expansion of pressurized water vapor at temperatures of "approx 200 ° C. 2. Modification of the procedure. Claim r, thereby characterized that the treatment only in the presence of dissociable bodies, such as ammonium salts. , -3. - Modification of the method according to the claims r and 2, characterized in that. post-treatment of the opened wood in the for preservation purposes. usual way with highly heated water-repellent Agents or mixtures of these also with the addition of colorants.