DE713953C - Process for the production of white wood flour - Google Patents

Description

Method of making white wood flour During manufacture of synthetic resins and molding materials, fine wood flour is used as a substantial filler material Quantities used. The wood flour to be used must be powder-like fine and above all Things should be free of fibers and splinters. Furthermore, this wood flour should be as white as possible in order to be able to produce synthetic resins in lighter shades, for example.

One method is to produce wood flour for plastics and pressed materials known; with the pre-dried wood (preferably hardwood) by a saw-like Machine or circular saw is pulverized. Because this flour product is insufficient corresponds to the requirements for the fineness for the purposes of plastic production of the flour, this process has been improved by the cutting speed of the circular saw is significantly increased at low feed rates Has. In this known method, when only air-dry material was used, it was also used Wood, the wood flour is passed through heated channels during suction and then dried again. This method in which a high cutting speed is used. Has but the disadvantage that artificial cooling of the saw blades is required. On the other hand, one can finitely use this procedure, in which the wood before the comminution is dried, do not produce particularly white wood flour, but rather only Flour in a yellowish tint. In order to produce the lightest possible wood flour, you have to at least in this manufacturing process specially selected light-colored hardwoods use.

While in the known method described above, the wood is basically dried and then pulverized, the invention proposes the opposite Way one. In the method according to the invention, green, white peeled woods are earthed crushed from the front side by inclined circular saws, and it is only then dried the resulting wood flour. In this procedure So fresh green wood, which is still a big one compared to air-dry wood Part of the original moisture contains and has not yet been discolored, with oblique The provided circular saws are pulverized and only then the wood flour in one operation dried and with it the total water content except for a small remaining one Removes moisture.

The use of green woods by itself is not an issue of the invention, not even the use of inclined circular saws, as this for the production of wood flour are known. The invention exists much more in the combination of measures identified above, the manufacture a particularly fine and white hollow meal as a filler for synthetic resin and the like. enable. With the rotating inclined circular saws, which on U.mf.ii, ig have a large number of teeth caused by the inclination of the saw blades a @ ,, the job in the axial direction towards uncf! wandering here will in itself be nice a relatively fine wood flour is achieved. If now according to the invention with these inclined circular saws are pulverized green wood, so contains the resulting Wood flour still has a very large proportion of water. The subsequent drying will removes this water, with the fine components of the wood flour shrinking considerably and thus an extraordinary fineness (powder fineness) of the wood flour is achieved will. Since green, i.e. not yet discolored, white peeled wood is pulverized a particularly white wood flour is obtained, which is suitable for production lighter synthetic resins are excellently suited.

The wood flour obtained with the inclined circular saws is immediately then dried. For this purpose, the green wood flour is used, for example, by a Conveyor screw fed directly to a heated drying drum.

A particular advantage of the new process compared to the one at the beginning Mentioned book can be seen in it that for the production of white wood flour for Synthetic resin and the like, not selected hardwoods come into question, but anything green wood can be used.

While in the known method, # ii for the purpose of predrying the Logs had to be sawed into boards, this is not the case with the new method necessary. Rather, it is the peasant tribes directly to the inclined ones Circular saws fed.

Claims (1)

PATENT CLAIM: Process for the production of white wood flour as Fillers for the manufacture of plastics and molding materials. characterized, that green, white peeled wood from the front side by inclined circular saws are crushed and the resulting wood flour is then dried.