DE601556C - Process for producing wood pulp - Google Patents

Description

Method for producing wood pulp The invention relates to a method for producing wood pulp from logs and wood waste without using a grinding process by double refining and consists in that the wood and / or the wood waste in naturally moist, d. H. in a moisture level required for dry refining Condition crushed, then in the same moisture condition with an increase subjected to dry refining of the friction temperature until vapor formation is so that a breakdown into fiber bundles takes place, whereupon the fabric; after this it has been diluted to a Dutch consistency, with an increase in temperature is refined wet by frictional heat.

The production of wood pulp by chopping wood without sanding it both in the dry and in the wet state is known per se, also in the Way that the water added to the wood is evaporated by frictional heat.

The present process is therefore better known as an association per se To address measures through which technical progress is achieved, that one a wood pulp is produced from wood and / or wood waste, which can be used as a package material, Bringing rolling stock or scrap stock or having it processed. in the In contrast to those processes in which either only dry or only wet (u. U. in two stages) refined and accordingly essentially wood flour or pulp is achieved, the present method offers better known per se as a result of the union Measures the possibility of reducing the amounts of wood flour and pulp in the end product to be able to measure, so that, depending on requirements, the density and cohesion of the products made from the wood pulp can be influenced.

It is well known that refining takes place in mills that consist of two against each other pressed and in the opposite sense rotating millstones exist. Between The material to be treated is passed through these millstones. Through this treatment the starting material is converted into fiber form in the most perfect way possible, d. H. the fiber bundles are broken down into their individual fibers (fibrilated).

That. The method according to the invention is now carried out in such a way that the wood is cut or comminuted in a naturally moist state. In this context, wood in a naturally moist state is understood to mean that which is about 50 to 70 BC. H. Contains water of the absolute dry weight of the wood. If logs, boards or planks are used, these are cut into slices. The disks are comminuted in the longitudinal direction of the fibers, with excessively short fibers such as dead-milled fibers, the formation of which is inevitable, along with impurities. The material prepared in this way is then ground to the same moisture level (in the so-called dry refiner), whereby it is broken up into fiber bundles. The upstream connection of this dry refiner has the purpose of achieving the same size as possible for the fiber bundles.

According to the invention, there should be an increase during dry refining the frictional heat can be achieved artificially. This can e.g. B. be done in that one the interacting friction surfaces of the refiner by springs or Weights loaded. This artificial increase in the frictional heat creates a Caused steam formation, which allows tearing of the fiber bundle.

After this treatment, the goods are on their way to the wet refiner transferred in a mushy state. A measured amount of water must therefore be supplied in order to increase the temperature again by frictional heat in the wet refiner to be able to.

For the sake of clarity, it is pointed out that under the expression Refining the fine sanding of those fibers and fiber bundles in the wood sanding industry is to be understood that by the previous processing with the Diefibreur not have been sufficiently sanded. This refining is done with the addition of smaller ones or larger amounts of water and can therefore be referred to as wet refining.

On the other hand, as far as the wood is required for dry refining wet conditions in the refiner, i.e. without the addition of water, is processed the term dry refining in place.

In order to be able to achieve the necessary temperature increase, it is necessary to that the product subjected to dry refining by adding water in the pulpy state (so-called Dutch consistency) is transferred.

The good that goes to the second refining process, namely wet refining, has been exposed and therefore leaves the wet refiner in a viscous state, is then fed into the sorting machine in strong dilution. Not completely in the fibrous state converted fiber bundles and pieces of wood, which under known as sauerkraut, are deposited, sometimes thickened and fed back to the thick matter container, in which it is mixed with the from the dry refiner Coming amounts of substance are again mixed to a Dutch consistency and recently increased to the wet refiner.

The fiber-contaminated water coming out of the sorting machine is in turn used in part to regulate the consistency of what is to be processed in the wet refiner Used good; these rules can e.g. B. take place in the thick matter container.

The wood pulp coming from the sorting machine is then sent to the usual dewatering machine, e.g. B. a single cylinder thickening machine, and passed from there to a pressing device. The produced in this way, 50 to 55 BC. H. Moisture-containing material is bleached or unbleached into parcel, roll or scrap material, whereupon the wood pulp can be put on the market.

In the accompanying drawing is one for performing the method Serving machine system illustrated schematically in one embodiment.

i denotes the chopping used to chop the trunk wood = or Cutting machine through which the wood in the well known in the pulp industry Way is sliced. From here the wooden discs and others Pieces of wood transferred to machine 2 (such as centrifuges, disintegrators etc.), which further shred the sliced product.

From the shredding machine 2, the wood material arrives at the Sifting machine 3, where cut to death, sawdust, sand and other waste and Impurities are separated and removed.

This completes the first stage of work. The estate is now the second Subject to processing stage. For this purpose, what is in the classifier is used Purified material transferred to the dry refiner 6, where under the influence of artificial The frictional heat generated by defibrating the wood mass in the longitudinal direction of the fiber is implemented in coarse fiber bundles.

If a wood material is processed that is already in a If the condition is too dry, then it will give it the moisture it needs to issue again, first promoted from the classifier to room 5, where it with from the water tank q. incoming water is mixed.

The wood mass is then transferred from the container 5 to the dry refiner 6 brought. This ends the second stage of work. To edit the third In the 2nd stage, the wood mass converted into fiber bundles in the dry refiner 6 becomes of the coarse vat7, where the mass is passed on for processing in the wet refiner required consistency is brought.

From here this wood mass, which has been brought to its consistency, is made using suitable Conveyor systems 8 (pumps and the like) fed to the wet refiner g, where they also with the generation of artificial frictional heat, as far as this practically is achievable, is frayed and converted into wood pulp.

This wood pulp produced in the wet refiner 9 is then added appropriate amounts of water are passed into the sorter io, where the finished wood pulp is separated from the remaining coarse material.

The finished wood pulp goes to the dewatering machine i i, while the coarse-containing water is returned to the vat 7 and used for mixing of wood mass coming from the dry refiner 6 is used.

As dewatering machines can be used for the aforementioned purpose Single cylinder cylinder mold cardboard machines or other suitable devices are used will.

The finished wood pulp is thickened in the dewatering machine i i, partially drained and transferred in layers (wood pulp arches). The good can if necessary also in a known manner z. B. using the sodium bisulfide method to be bleached.

In the same way, as is well known, in these machines you can Shape well into roll or scrap cloth.

The material produced in this way can be processed by presses, centrifuges and similar machines can be further dehydrated and put into packet form. Such a press that either connected to the dewatering machine i i or independent of it can be, is denoted by 12 in the drawing.

After the item has left the press 12, it can be shipped and has a moisture content of 50 to 55 percent. H. Water on.

The procedure can also be modified to include the The finished product coming out of the io sorter immediately thickens to a Dutch consistency and feeds it to the Dutchman, where it is turned into paper.

In this case there is no processing in the dewatering machine i i and in the press 12.

Claims (3)

PATENT CLAIMS i. Process for producing wood pulp by double refining, characterized in that the wood and / or wood waste is comminuted in a naturally moist state, ie in a moist state required for dry refining (about 50 to 70 % water content), then in the same moisture state is subjected to dry refining with an increase in the frictional temperature until steam formation occurs, so that the fiber bundles are broken down, whereupon the material, after it has been diluted to about Dutch consistency, is wet refined with an increase in temperature by frictional heat. 2. The method according to claim i, characterized in that when processing dried out Before processing in the dry refiner, wood this back onto the for dry refining required degree of humidity is brought back. 3. The method according to claim i and 2, characterized by the use of the one coming from the sorter (io) and coarse waste water returned to the vat (7) for regulating the Consistency of the coming from the dry refiner (6) and in the wet refiner (9) processing wood mass.