DE240896C

DE240896C -

Info

Publication number: DE240896C
Application number: DE1883240896D
Authority: DE
Priority date: 1909-12-14
Filing date: 1883-03-20
Publication date: 1911-11-20
Also published as: GB191029087A

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

1913z,1913z,

20. März 1883March 20, 1883

die Prioritätthe priority

Nach der Erfindung wird der Zellstoff für die Papierfabrikation aus Holz von Rotkiefern, Zedern, Föhren, Zypressen, Gelbfichte, und ähnlichen mehr oder weniger harzreichen Bäumen in der Weise hergestellt, daß das zerkleinerte Holz zunächst in einem offenen Behälter in erhitzter Natronlauge eingeweicht und dann mit dieser Lauge in einem Kocher unter Druck gekocht wird. Dann wird die so erhaltene Holzmasse zusammen mit der Kochlauge abgekühlt.According to the invention, the pulp for paper production is made from wood from red pine, Cedars, pines, cypresses, yellow spruce, and similar more or less resinous trees manufactured in such a way that the shredded wood is first placed in an open container soaked in heated caustic soda and then boiled with this lye in a cooker under pressure. Then the wood mass obtained in this way is cooled together with the cooking liquor.

Der Baumstamm wird zunächst in Bretter von etwa 30 cm Länge und etwa 10 cm Dicke, die Zweige werden auf etwa 30 cm Länge zerschnitten. Zweckmäßig werden Rückstände aus Holzmühlen, z. B. die äußeren Reste, Kanten und kurzen Enden verwendet. Das so vorbereitete Holz wird zu Splittern und Spänen zerkleinert.The tree trunk is first cut into boards about 30 cm long and 10 cm thick, the branches are cut to a length of about 30 cm. Residues are useful from wood mills, e.g. B. the outer scraps, edges and short ends are used. The wood prepared in this way turns into splinters and Chipped chips.

Die diesem Zweck dienende, in Fig. 1 mit 2 bezeichnete Maschine liefert ein Holz von unregelmäßiger Größe. Es ist deshalb erforderlich, das zerkleinerte Holz· mit Hilfe eines Sortierzylinders 3 von 1 bis 2 cm Maschenweite zu sortieren. Die langen Splitter gelangen in den offenen Behälter 4. Etwa 7 cm vom Boden dieses Behälters ist eine durchlochte Platte 5 mit Löchern von etwa Y₂ cm Durchmesser angebracht. Unter dieser Platte sind ein Ventil 6 und eine Dampfschlange 7 zur Erhitzung des Behälterinhalts angebracht. Etwa 7 cm vom Oberrande des Behälters 4 ist eine durchlochte Platte 8 angelenkt. In diesem Behälter wird das zerkleinerte Holz mit einer Ätznatronlauge von 10° Be. durchtränkt, die durch die Dampfschlange 7 auf eine gleichmäßige Temperatur von 100 ° C. erhitzt wird. Das in den Behälter 4 gefüllte Holz wird durch den durchlochten Deckel 8 am Schwimmen gehindert, so daß alle Holzteile untergetaucht bleiben und vollständig durchtränkt werden.. Nach 8 Stunden wird das Ventil 6 im Fußboden geöffnet und die Flüssigkeit in den Kocher 9 abgezogen.The machine for this purpose, denoted by 2 in FIG. 1, delivers wood of irregular size. It is therefore necessary to sort the chopped up wood with the aid of a sorting cylinder 3 with a mesh size of 1 to 2 cm. The long splinters get into the open container 4. About 7 cm from the bottom of this container is a perforated plate 5 with holes about Y ₂ cm in diameter. A valve 6 and a steam coil 7 for heating the contents of the container are attached under this plate. A perforated plate 8 is hinged about 7 cm from the upper edge of the container 4. In this container, the shredded wood is treated with a caustic soda solution of 10 ° Be. soaked, which is heated by the steam coil 7 to a uniform temperature of 100 ° C. The wood filled into the container 4 is prevented from swimming by the perforated cover 8, so that all wood parts remain submerged and are completely soaked.

Der Kocher 9, der in Zapfenlagern 12 drehbar aufgehängt ist, besitzt am oberen Ende ein Mannloch 10 und ein Dampfventil 11. Durch die Zapfenlager 12 und eine am Boden und längs einer Seite angeordnete Rohrschlange 13 wird Dampf zugelassen. Nachdem die Lauge im Kocher auf den Siedepunkt erhitzt worden ist, wird das durchtränkte Holz aus dem Behälter 4 entnommen und in die kochende Flüssigkeit im Kocher gebracht. Das Mannloch 10 wird geschlossen und der Druck durch Einlassung von Dampf durch Ventil 11 gesteigert. Die Kochtemperatur und der Druck werden im Kocher während etwa 8 Stunden erhalten. Danach wird der Dampf zutritt abgesperrt und das Ventil 11The cooker 9, which is rotatably suspended in journal bearings 12, has at the upper end a manhole 10 and a steam valve 11. Through the journal bearings 12 and a coil arranged at the bottom and along one side 13 steam is allowed. After the lye in the cooker to the boiling point has been heated, the soaked wood is removed from the container 4 and in put the boiling liquid in the cooker. The manhole 10 is closed and the Pressure increased by admitting steam through valve 11. The cooking temperature and the pressure are maintained in the cooker for about 8 hours. Thereafter, the entry of steam is shut off and the valve 11

Claims

opened to release the pressure and let the steam out of the cooker. The cooker remains in a substantially vertical position during cooking. For emptying of the cooker, the manhole is opened and the cooker is reversed, whereupon the entire contents, liquid and wood mass, is emptied into a pit 14. This pit 14 (Fig.

2) is expediently funnel-shaped and provided with a number of cooling coils 15 for cooling the lye with the wood mass. The entire content of the pit is cooled ^{to about 40 ° C. by the cooling coil 15.} It has been shown that this makes the fiber extremely tough and a. Obtained a silk-gloss appearance. When the content of the pit 14 has cooled to about 40 ° C., it is removed by a lever mechanism 16 and emptied into a sieve drum 17 of about 1 to 2 cm mesh size, where most of the liquid is separated from the wood mass. The remaining wood mass is emptied from the sieve drum 17 into nip rollers 18, which break up the larger splinters. The squeezed material then falls into the vat and is washed here to remove any remaining traces of lye. The washed mass is conveyed by an elevator 20 to a fabric press 29, where it is completed by further pressing for paper manufacture.

The liquid drawn off through sieve 17 can be further treated in some way to make the caustic soda and various Recover by-products.

The treatment of the wood in the container 4 with caustic soda is intended to cause a certain amount of comminution the wood fiber and a gradual absorption and dissolution of the resins. These Resins are gradually dissolved by the caustic soda under the action of the heat, which opens the pores of the wood and prepares the fibers for further treatment will. After leaving the container 4, the wood is more or less spongy

and porous. Cooking the wood in its own juices and the original caustic solution in the digester 9 results in a further and final crushing of the same and makes it is soft and fibrous by separating the non-fibrous components from the fibrous ones. The following partial cooling of the boiled wood in its liquid in the pit 14 allows the gelatinous gums to adhere to the fibers, so prevents that Loss of the same, as it would occur if the lye immediately after the Emptying the cooker would be deducted. By slowly cooling the lye with The types of rubber and resin, which are relatively insoluble in cold water, remain in the wood mass adhere to the fibers and act as a glue in the finished paper, increasing the value of the pulp. Simultaneously A kind of mercerization of the wood fiber is likely to occur here, which makes it tougher and gives it a silky sheen.

Patenτ-A ν Say:

i. Process for the production of pulp from wood, characterized in that that the chopped wood is first placed in an open vat with heated caustic soda soaked and then cooked with this lye in a cooker under pressure, whereupon the wood mass thus obtained is cooled together with the cooking liquor.

.2. Device for carrying out the method according to claim 1, characterized in that the soaking tub (4) with a perforated intermediate floor arranged above a steam coil (7) (5) and a hinged, perforated cover plate (8) for submersion of the wood is provided.

3. Device according to claim 2, characterized in that the below the quiver (9) attached, known emptying pit (14) with cooling coils (15) is provided.

1 sheet of drawings.