DK166736B1 - PROCEDURE FOR THE MANUFACTURE OF BEARING ELEMENTS, INCLUDING LOADS FROM A FLUIDIZED CELLULOSE FIBER MATERIAL - Google Patents

Description

in DK 166736 B1

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process for the manufacture of load-bearing elements, including pallets, by depositing a fluidized cellulosic fibrous raw material on a shaping substrate by aspirating a pulp of the fibrous raw material onto this substrate.

-r Fluidized fiber raw material is understood to mean a ---- suitable starting material which may be wet in shape and which is fibrous in nature. As such a starting material, for example, 10 may be referred to a fiber pulp material, such as is used, for example, for trays and cartons for packaging fragile and delicate items such as fruits, flowers, eggs and articles, for example glass. The pulp material then usually consists of a slurry, fibrous cellulose.

For this purpose, it is known to employ a manufacturing technique in which the starting material in the form of a pulp is applied, in a deposition process, to the contour-giving exterior of a mold which is permeable to allow an gaseous working medium to influence the material 20 through suction. the material of the mold, thereby sucking the material in contour on the mold.

The object of the invention is to indicate how this, in itself suitable manufacturing technique, can be used not only for the manufacture of relatively small and light objects, but also for the production of large, relatively heavy elements which are distinguished by a sustainability which is substantially degree is based on a corresponding thickness of the material layer deposited on the forming substrate. By comparison, the material thickness of the 30 small and light objects is rather low, and the practically necessary stiffness is usually provided by a deliberate design of wall portions which, for example, provide support for the said articles, the walls producing a relatively rigid, overall workpiece. to mutually support each other.

The stated object is achieved according to the invention by producing a pulp of the fluidized raw material having a pulp which has improved dewatering properties using a long-fiber starting material, applying this pulp to the substrate in such an amount, in such a way that on the substrate, upon suction, a fibrous raw material layer of such a thickness is deposited to provide the sustainability desired for the element.

GB-A-1,589,077 discloses a molding of articles composed of parts of different thickness, which is achieved by varying the concentration of the mold's suction holes to remove the liquid phase from a fiber-containing suspension over the mold surface.

SE Patent Laid-Open No. 324,498 discloses a web cloth having a varied mesh pattern to provide variations in the wall thickness of articles molded by suction of a fibrous web material.

U.S. Patent No. 3,325,349 discloses measures for controlling the pulp quantity required to produce a particular article by reducing the thickness of 20 certain portions of the article. For this purpose, a specific perforation of the suction mold used is used.

U.S. Patent No. 2,079,667 discloses measures aiming for uniform layer thickness of the molded article, to be obtained by a special design of the mold used.

Contrary to this prior art, it is essential for the invention to use a pulp which can be dewatered particularly easily so that a substantially increased thickness of the deposited fiber raw material layer is provided by an increase in the pulping fluid's liquid performance, which is again achieved by use. of a long-fiber starting material.

Hereby it will be possible, using the aforementioned manufacturing technique, to produce sustainable elements such as pallets and building elements which, in contrast to said packaging examples, can exhibit relatively smooth and smooth outer surfaces and which in themselves exhibit a 3 DK 166736 B1 great carrying capacity. The deposition of a fiber raw material layer of the defined thickness means that, under the suction pressure applied to the suction layer, a material density which is greatest at the outer surface of the material layer facing the molding surface and which will act as reinforcing material can be provided. is spaced apart from the disposed element * ----, A * · _ through the median plane.

Utilizing the layer thickness of the element thus produced, its sustainability as set forth in claim 2 can also be increased by providing one or more variations in the layer thickness distributed by the suction effect during a common suction process for the required amount of fiber pulp quantity of the whole element is varied locally accordingly. In this way, 15 during one and the same operation, i.e. The deposition of the fiber raw material on the shaping substrate could be shaped both at the final outer surface desired for the element and, using the thickness of the material layer, a sustainability increasing shaped structure in the element forming the material blank itself. Such a structure, as stated in claim 3, can, for example, be designed as a coherent structural pattern with a greater layer thickness relative to the other areas of the element.

A convenient method for carrying out the method according to the invention is set forth in claim 4, and is characterized in that a permeable pervasive working medium is used for suctioning an easily degradable pulp of the fibrous raw material into the desired thickness. mold having a permeable shape surface permeable to the working medium, the thickness of which is adapted to the thickness of the fiber raw material layer to be deposited by suction of the pulp on this surface.

Hereby, such an interaction can be achieved between the pulp's aberration and the suction surface of the mold surface, that even elements having a high fiber layer thickness due to the desired sustainability can be produced rationally.

4 DK 166736 B1

In order to obtain local variations in the layer thickness of the fiber raw material layer, as stated in claim 5, a mold whose shape surface has a permeability varying according to the layer thickness of the local or local variations or the corresponding structural pattern of the deposited on the mold surface, easily removable fiber pulp layers.

This means that the deposition of fiber raw material on the mold surface will be different according to the permeability of this surface 10 itself, whereby the suction effect will vary locally, so that in areas where the mold surface permeability is low, a reduced deposition of fiber raw material on the mold surface will occur. will be large in areas where the shape surface permeability is high.

15 For the preparation of a pulp which is to be easily degradable, as stated in claims 6-9, a raw material containing long fibers can be used as a raw material which is processed into a pulp using a cutout in a pulp , partly by a prior, separately controlled dry grinding, in which the starting material is divided into dizeable amounts and comminuted into its fibers, after which the article is made of the pulp thus formed.

The use of a pulp as an essential processing step of the fiber raw materials to form a pulp, of which the desired articles are to be made, inter alia, in cases where the fiber raw materials are received as dry masses in bales, for example as paper waste.

In the pulper, a vigorous vortex is produced, whereby the individual parts of the material rub against each other, thereby being finely divided, whereby the raw materials are divided into fibers.

Especially with heterogeneous materials such as waste or recycled paper, it is to be expected that this division takes place successively, so that the fibers that are released first are subjected to further, substantial processing over the later released fibers. In other words, the machining of the pulper in its course will thus be uncontrolled, and thus uneven.

5 DK 166736 B1 Said further processing causes both the degree of grinding (° SR-Schopper-Riegler) and thus the formation of the pulper to be increased, which has a negative influence on the later dewatering of the object made by the pulp, 5 and increases the shrinkage of the object. during the dewatering and drying of its material.

By the method of claims 6-9, it is achieved that at least partially a fiber raw material, the fibers of which are already substantially divided into single fibers, is supplied to the pulper, which is why they are more immediately and simultaneously susceptible to the pulper provided. self-milling effect and mixing effect. As the pulper processes a more uniform feedstock, the degree of grinding provided in the pulper can also be controlled to be more uniform, and the aforementioned bonding of water in the pulp exiting the pulper will thus be better controllable.

However, the same approach will also bring other benefits which are particularly valuable in recycling waste paper.

20 Recycled paper waste is available in many different grades and grades. If this material is subjected to a separate, controlled dry grinding prior to the extinction in the pulper, it will often be possible to use a poorer, and thus cheaper, material quality than if the partitioning process was carried out solely as a cut-out in the pulper.

It is within the scope of the invention to carry out the aforementioned, separate dry milling process as a multi-stage process, whereby the starting material can be divided into dosable quantities in a particularly effective manner.

In this way, for example, a waste paper material containing plastic, wet-strength paper, plastic-laminated cardboard and paper can also be divided into fibers and other particles as desired. Non-paper split components may then be separated prior to delivery to the pulper, or, as they are in finely divided condition, these components may be included in the subsequent production process.

6 DK 166736 B1

In one embodiment of this method, a separately controlled, dry grind subjected to long-fiber starting material may be added to a pulp already formed in the pulper and subjected to a common time-limited knock-out with this.

In this way, an element can be produced whose fiber material is mainly bonded by hydrogen fiber bonds and partly mixed with air suspended fiber material, to which bonding is usually used glue.

It has been found that in this way a traditional, completely hydrogen bonding of the entire pulp can be dispensed, which means that the dewatering, and thus the production time of the element, can be significantly shortened. Furthermore, the method allows for close control of the strength properties desired for the element 15, which can be controlled precisely by the addition of glue.

These advantages are essential for a rational and thus economically industrial manufacture also of large, sustainable elements using the described aspiration technique.

For example, a multi-stage dry milling can be carried out using a blasting machine, also called shredder, followed by a treatment in a hammer mill which can thus receive the material from the shredder in 25 dispensable quantities and subjecting the material to a further comminution action before it, if desired also in especially dosing quantities, is fed to the pulper for the actual knockout operation.

The aforementioned separate, controlled dry milling of the fiber raw materials prior to their scraping in the pulper also opens up the possibility of reuse of waste paper in cases where the articles to be manufactured must be shrink-free and target-proof. A starting material with a high content of wood-containing fibers causes less shrinkage than if the fibers were cellulose fibers. It has been found that using the method of the invention of a wood-containing paper raw material even Jean adds a substantial amount of affordable recycled waste paper, including cardboard waste, which is not necessarily wood-containing, since the From the prior separate, controlled dry milling of the raw material, a pulp will be produced which does not cause any unwanted shrinkage of the manufactured articles.

It is in principle known to produce elements of a fluidized fibrous material to use auxiliaries 10 in the form of fillers and chemicals, as well as binders. The adjuvants determine whether the manufactured elements should be more or less strong, hard and transparent, or weak, soft and absorbent. The present invention also provides advantages in using such auxiliaries.

Namely, the division of the manufacturing process into several manufacturing stages allows for increased additives at different stages of the overall manufacturing process. The open structure of the final pulp obtained as a result of the inventive machining according to the invention even makes it more accessible to the auxiliaries, so that, for example, a binder can be applied more or less integrally in the surface of the manufactured elements to provide a increased wall strength.

The addition of the excipients during the preceding separate controlled dry milling may in a particularly good way promote a very uniform distribution of the excipients in the produced pulp. Of course, the excipients can also still be added to the pulper.

Furthermore, it is within the scope of the invention that the knockout in the pulper is carried out as a processing process controlled in dependence on the prior separate milling. In other words, the degree of self-grinding provided in the pulper can be adjusted to the degree of grinding which has been carried out according to the conditions at the preceding grinding step (s). For example, a paper pulp, 8 DK 166736 B1, which is divided into the pulper to a normal degree of grinding of 60 ° SR (Schopper-Riegler), can be added to a dry material obtained by dry grinding, after which the mixture is processed in the pulper for an additional 5 minutes. Elements made from such blending pulp can be given a particularly large thickness, porosity and permeability. This means that the products can have good dewatering properties and therefore can also be manufactured with large thicknesses.

An easily degradable pulp for use in the process according to the invention allows for a uniform application of fiber suspension over the mold, even in the case of the manufacture of high wall thickness elements.

Waste paper, also called recycled paper, can be very composed and contain fibers of many different lengths. Nevertheless, it has been found that the average fiber length is so great that the above-mentioned especially dewatering and structural advantages can be obtained when this paper material is part of the manufacturing process.

The process according to the invention can be used for processing also so-called virgin material.

The invention will now be explained in more detail with reference to the drawing, in which: 1 diagrammatically shows a process sequence overview, which summarizes process phases which may occur during the course of a process for manufacturing, for example, a pallet; FIG. 2 examples of combinations of different process phases, fig. Fig. 3 is an oblique view of a first embodiment 30 of a load-bearing pallet member manufactured using the method of the invention, showing one of the pallet corner portions from which the corner portion itself is divided; 4 is a schematic side view of another embodiment 35 of a pallet; FIG. Fig. 5 is a side view (Fig. 5b) and in section along line 9 DK-166736 B1 V-V (Fig. 5a) a third embodiment of a pallet; 6 is a schematic cross section through one fourth embodiment of a pallet; FIG. 7 is an oblique view of a fifth embodiment of a pallet; FIG. 8 is a diagrammatic cross-section through a sixth embodiment of a pallet; FIG. 9 schematically shows a pallet with a strap; FIG. 10 schematically shows a pallet with a wooden rail 10; FIG. 11 is a schematic diagram of a loading pallet with a fiberboard stand rail; FIG. 12 is a diagrammatic cross-section through a pallet made up of elements of varying layer thickness; FIG. 13 shows another embodiment of such a pallet; FIG. 14 shows a third embodiment of a pallet containing a single element of varying layer thickness; FIG. 15 is a cross-section through an embodiment of the support leg of a pallet; and FIG. 16 is a schematic representation of a mold having an element of fiber material disposed thereon, the mold surface of both the mold and thus also the deposited element having varying layer thickness.

The FIG. 1 and 2 show a total of 14 process phases. Depending on the circumstances, the manufacturing process may be conducted using all of these phases, or only some of the phases, but some of the phases may also be used, and then introducing the resulting product concurrently as a supplement to a continuous manufacturing process.

30

Example 1

All 14 process phases are used.

Example 2 35 Stages 1 through Stage 5 are worked. Subsequently, phases 8 and 9 follow, and phases 11 through 14 are finally continued.

10 DK 166736 B1

Example 3

Work is carried out in one production line from phase 1 to phase 5, and in another production line with phase 4, and optionally phases 5, 6 and 7. The wet fiber pulp formed in this second production line 5 is added to the product coming from the first production line. After this, several of the subsequent phases are usually continued.

Hereby is provided a product in which the fibrous material produced in the second production line is substantially bonded to hydrogen fiber bonds, while from the first production line a fiber material suspended in air is obtained, and to which bond is generally used glue. In this way an overall degree of grinding which is optimal and at the same time an optimal addition of glue can be provided. This means that this embodiment of the method allows for a comprehensive consideration of the quality of the raw material provided.

In the following, some embodiments of pallets made using the method of the invention will be described.

As shown in FIG. 1 and 2, the pallets are made of a suspension of a fluidized fiber raw material, the suspension in an aqueous phase being deposited by suction on a shaping support. Of the fluidized fibrous material, as described above, an easily degradable pulp is formed. This pulp is applied to the shaping substrate in such an amount and the suction underpressure applied to the pulp on the substrate is controlled in such a way as to deposit a fiber raw material layer of such thickness as to substantially provide the for the element, in the present case, thus the pallets want sustainability.

The water content of the pulp applied to the substrate can be up to 75%, and this water content can then be removed by pressing and / or drying. Since the final product, ie. The sustainability of cargo pallets must depend to a considerable extent on the thickness of the fibrous raw material deposited on the shaping substrate, it is an essential prerequisite for economic production that the pulp used is easily dewaterable. The invention comprises a process for producing a pulp having this property.

The end product can then be used as is, or it can be included with other products in another end product, for example in the form of a laminate construction.

It has been found that in this way it is possible to produce pallets which have a low weight of 5-8 kg for a pallet size of 800 x 1200 mm and which have a loading capacity of approx. 500 kg. The load capacity will always depend on the quality of the fiber suspension used, as well as on the structural design of the pallet itself, for which some examples will be given below.

Pig. 3 shows schematically a part of a pallet 10 formed with integral legs 12 and with strengthening ribs 20 14.

Example a): Dimensions 800 x 1200 x 120, formed three-dimensionally in a single workflow with a "wet" weight of 18 kg, and a weight after drying of 6 kg.

Example bl: dimensions 800 x 1200 x 120, shaped three-dimensionally with a "wet" weight of 18 kg, a weight after hot pressing of 12 kg, and a weight after drying of 6 kg.

FIG. 4 schematically shows a pallet in the form of a laminate, the pallet having a lower part 16 which corresponds substantially to the part 10 of FIG. 3, and a top, flat cover plate 30 18 which is also configured in accordance with the method of the invention.

Example c); dimensions 800 x 1200 x 123, part 16 of the pallet is shaped three-dimensionally with a "wet" weight of 12 kg and a weight after drying of 4 kg. Cover plate 18 is made on a flat mold plate: "wet" weight of 6 kg, weight after hot pressing of 4 kg, weight after drying of 2 kg Cover plate 18 is 12 DK 166736 B1 glued to the upper part of the lower part 16.

Cover plate 18 may have holes for receiving the legs from a pallet overlying a stack.

FIG. 5 shows a pallet of the same type as shown in FIG. 4, but with the difference that the upper part 20 of the pallet is formed three-dimensionally with reinforcing ribs 22 corresponding to the rib portions 24. In the lower part 16, dimensions 600 x 800 x 140.

Example dl in the outer side 16 of the pallet is designed with a 10 wet weight of 7.5 kg and a weight after drying 2.5 kg, and the upper part of the pallet is designed with a "wet 11 weight of 4.5 kg and a weight". after drying at 1.5 kg.

FIG. 6 shows a pallet measuring 800 x 1200 x 150.

Example e): The pallet has a three-dimensional center portion 15 26 having a "wet" weight of 6 kg and a weight after drying of 2 kg, and two cover plates 28, each formed on a flat mold surface, and having a "wet" weight of 6 kg, a weight after hot pressing of 4 kg, and a weight after drying of 2 kg. Furthermore, the plate has nine three-dimensional legs 30, each having a "wet" weight of 20 0.3 kg, and a weight after drying of 0.1 kg. Glue for mounting cover plates and legs of 0.05 kg. Finished product weight: 6.95 kg.

FIG. 7 shows a pallet, measuring 800 x 1200 x 150.

Example f): The pallet is composed of two identical, three-dimensional plate elements 32, each having hollow projections transverse to the plate portion 34. The plate elements are mounted with their projections 34 facing and in contact with each other.

Each plate member 32 has a "wet" weight of 9 kg, a 30 weight after drying of 3 kg, and nine 100 mm high legs, each with a "wet" weight of 0.3 kg, and a weight after drying of 0.1 kg. Glue for mounting 0.05 kg. Weight of the finished product: 6.95 kg.

FIG. 8 shows a loading pallet containing two trapezoidal profiled center plates 36, the ribs 38 of which intersect, as well as two outer, flat cover plates 40. On one of these plates 13

LUV IDO / OO D I

do not glue legs shown.

Both the trapezoidal and the planar plates, 36 and 40, respectively, can be made either piecewise by discontinuous molding, or continuously on continuous strips, followed by 5 planes, respectively, or trapezoidal profiled male and female embossers. This provides a great deal of flexibility for the manufacture of the pallet, as a greater or smaller number of sheet layers can be selected, which, in addition, due to the pressing process, entails only low drying costs.

Example g); Two trapezoidal profile inserts 36 have a "wet" weight after molding of 4.5 kg, a "wet" weight after pressing of 3.0 kg, and a weight after drying of 1.5 kg. Two flat cover plates 40 have a "wet" weight after molding of 4.5 kg, a "wet" weight after pressing 3.0 kg, 15 and a weight after drying of 1.5 kg. Nine pieces (not shown) each have a "wet" weight after molding of 0.3 kg and a weight after drying of 0.1 kg. Glue for mounting 0.05 kg.

In the embodiments described, the plate parts and legs of the pallets may be formed together during a common suction operation, or they may be formed by each suction operation. The legs may, if desired, also be made of a material other than fiber raw material, but it has been found that by using the method according to the invention it will be possible to make legs which are sufficiently durable and robust while having a low weight. , as indicated in the Examples.

Furthermore, the method according to the invention permits the addition of special reinforcing fibers to the fiber pulp when particularly high strengths are desired.

30 The design of the elements may also take into account the application of additional external reinforcing agents. FIG. 9 to 11 indicate some examples of load-bearing elements in the form of pallets, for example, as shown in FIG. 10, a common stand rail 35 44, for example of wood, is placed under the pallet legs, or as indicated in FIG. 11, a special, of 46, and a common bar 14 composite rail 48 assembled pallet base 50 made of the same material as the pallet plate part '52 of the pallet 52 are used.

As already mentioned, the deposition of a fibrous raw material layer of the invention which is so large as to provide substantially the desired sustainability of the element results in the possibility of utilizing the layer thickness for a further increase in the sustainability, thereby providing in the fibrous raw material layer. variations in the layer thickness, for example as a related structure-10 pattern. By this it is meant that, for example, variations in the layer thickness are formed. rib-like formations at which the layer thickness of the elements is greater than in the other regions of the element. By a suitable design and arrangement of such, or similar other formations, an increased stiffness can be achieved in the element, thereby increasing its sustainability.

FIG. 12 to 15 give examples of such variations. Also, as already mentioned, such variations can be provided by using a permeable shape of a gaseous, pressurized working medium 20 having a permeable surface permeable shape having a permeability which varies according to the desired variations in the layer thickness of the element.

FIG. 12 shows a cross-section through a pallet made up of two rib-profiled inner members 54, which 25 are covered on the outside by two flat cover plates 56. Each inner member 54 is made in a single operation made of a fiber raw material deposited on the suction mold's molding surfaces with a wall thickness varying from rib top to rib bottom, being greatest at the rib top 54a, and least at the rib bottom 54b. The cross-sectional profile of the rib formation is angular and the inner members 54 are in mutual abutment at their tops 54a.

FIG. 13 shows a cross-section through a pallet of the same type, with the difference that the inner elements 54 are 35 mutually abutting at their bottoms 54b, so that it is the rib tops 54a which support the cover plates 56.

15

FIG. 14 shows a cross-section through a pallet having only a single inner element 58 which, with its tops 58a and bottom 58b, abuts on exterior flat cover plates 60. Also, as described in 5, this inner element 58 is a single operation with such variation in the layer thickness, that - this is greatest at the rib top 58a, and least at the rib bottom 58b.

FIG. 15 shows an example of a support leg 62 for a pallet. The leg 62 is in potted form, and it is made in a single, by suction of a fibrous raw material operating procedure as described. This element also has different layer thickness, being thicker at the bottom 62b.

FIG. 16 illustrates how such variations of the layer thickness can be provided according to the invention. As schematically illustrated, suction is applied to the mold surface of a fluid-readily degradable pulp formed by a gaseous pervious mold 64 permeable to a working medium which has a pervious mold surface 66 permeable to the working medium. by forming a rib profiled pallet member 68 at which the material layer of the rib top 68a is thick and the rib bottom 68b is thin, a mold having a rib profiled mold surface 66 of variant permeability is used, the mold surface 66 being thick at the mold surface top 25 pin 64b, and thin at the mold surface bottoms 64a. This means that the suction effect will be less at the portion formed by the mold surface peaks 64b than at the portion of the mold surface formed by the mold surface bottoms 64a. This, in turn, causes that less fiber material is aspirated upon suction of the applied fiber pulp at the mold surface peaks 64b, which form the rib peaks 68a, thereby obtaining a relatively large layer thickness, and thus a high strength, of the ribs formed therefrom. This manufacturing technique can, in principle, be applied to many different variations of the layer thickness, and the above-mentioned should only be a typical example of this.

16 DK 166736 B1

The applicability of the invention is illustrated above by examples of pallets. The Ran with similar advantages is also used in the manufacture of many other types of supporting elements, including wall elements for various purposes, building elements, and insulating elements. Furthermore, it is apparent from the foregoing that the method of the invention has opened a path for the appropriate use of many kinds of starting materials and additives. The invention also allows for trouble-free incorporation of sheets or mesh-like items into the outer surface of the molded article.

Claims (9)

A method of producing load-bearing elements, including pallets, by depositing a fluidized cellulosic fibrous material on a shaping substrate by aspirating a pulp of the fibrous feedstock on this substrate, characterized in that a pulp which is produced by use of the fluidized fibrous raw material of a long-fiber starting material has improved dewatering properties such that this pulp is applied to the substrate in such an amount and that the suction is controlled in such a way that a fiber raw material layer of such thickness is deposited on the substrate to provide it for the element desired sustainability, after which the element is finalized. 2. A method according to claim 1, characterized in that one or more variations in the layer thickness are distributed over the fiber raw material layer in that the suction effect during a common suction process for the fiber pulp quantity required for the whole element is varied locally. . Process according to claim 2, characterized in that the deposition of the fiber raw material with a thickness corresponding to the desired sustainability is provided as a coherent structural pattern with a greater layer thickness relative to the other areas of the element. Method according to any one of claims 1-3, characterized in that a pervious form permeable to a gaseous, suppressed working medium having suctionable pulp of the fibrous raw material in the desired thickness is used. the medium pervious mold surface, the thickness of which is · adapted to the thickness of the fiber raw material layer to be deposited by suction of the pulp on this surface. Method according to claim 4, for carrying out the method according to claim 2 or 3, characterized in that a mold is used, whose mold surface has a permeability which varies according to the layer thickness DK 166736 B1 of the local or local variations, respectively. , or the desired associated structural pattern of "easily degradable fiber pulp sheets deposited on the mold surface. Process according to any one of the preceding claims, characterized in that, as a fiber raw material, a starting material containing long fibers is used, -V. and which is processed into a pulp using, in part, a cut-out in a pulper, and partly by a prior, separately controlled dry mill, in which the starting material is divided into dizable quantities and comminuted into its fibers, after which the article is made of the pulp thus formed. Process according to claim 6, characterized in that the preceding separate grinding is carried out as a multistage process. Process according to any one of claims 6-7, characterized in that a separate, controlled dry milling subjected to long-fiber starting material is added in dosed amounts to a pulp already formed in the pulper and subjected to a common time-limited elimination thereof. Process according to any one of claims 6-8, characterized in that an auxiliary substance is added during the re-use of the formed pulp.