DE102008030417A1 - Material plate e.g. fiber material plate, manufacturing method for use in double band press, involves controlling increase of mass per unit area transverse to production direction for manufacturing differential flat weight profile - Google Patents

Abstract

The method involves distributing equal sections of pressed material mat (2) to a press by a distributing device (8), and adjusting increase of mass per unit area longitudinal to production direction for manufacturing a differential flat weight profile by reception of a grit (35) in a track. An increase of another mass per unit area is controlled transverse to production direction for manufacturing a differential flat weight profile parallel to the production direction by reducing reception of the grit in the track from the distributed pressed material mat by an adjusting device. An independent claim is also included for a system for manufacturing a material plate.

Description

The Invention relates to a method for producing material plates, such as chip, chip, fiber or similar wood-based panels and plastic plates according to the preamble of claim 1 and a plant according to the preamble of claim 11.

The Production of chip or particle boards, for example OSB or MDF boards, is an existing state of the art. To be summarized from existing base material in the production of sandwich panels (OSB) sifted, pretreated, glue, various fractions using Spreaders on a forming belt evenly sprinkled and pressed in presses (continuous or clock-bound).

To the fundamental challenges of this technology For decades, the optimal production of so-called pressed material mats on a form band. In doing so, value is placed on the given Area weights in width and length possible be optimally adhered to over or under scattering to avoid. With an over-scattering arises for the producers of unnecessary loss of material, at Subscattering will not reach the standard values of the product. Due to current raw material developments and legal requirements However, the record producers are now held, if possible to use little material with the same properties.

For these and other reasons, for example, with WO 2005 046 950 A1 a particle or particle board and a method for its production has become known that should take these circumstances into account. This particle plate consists of at least three layers, the outer layers are made of fine material, whereas the middle layer consists of coarser material. In order to save a maximum amount of material, it is intended to produce the plate basically with low material content, only a higher proportion of material to be scattered at the points of the plate, which is later required for the incorporation of fittings or fasteners to compounds to make with other parts. For this purpose, it is proposed to continuously scatter in the longitudinal direction or in the production direction of the pressed material mat a higher proportion of material on the forming belt or on the already existing lower cover layer to get spaced in the production direction tracks with higher material input of Pressgutmatte after production have a uniform in length and width plate, a higher density. In addition, by at least one transversely movable to the production direction nozzle at certain points, preferably in the transverse direction stain similar additional material are applied. This serves to obtain from a split plate strand chipboard having a higher density at the edges for the purpose of edge processing or mounting of fittings or connecting means. Not only should the longitudinal sides have a higher density, but also be present at the transverse edges, for example, cabinet side parts top and bottom, a higher density.

• a) Sind diese lokal sehr eng begrenzt und weisen sie gegenüber der Längs- und Quersymmetrielinien enge Krümmungsradien auf, so ergeben sich schlechte Querzugfestigkeiten und mangelhafte Werte in der Längssteifigkeit; Bei schwingenden Dauerbeanspruchungen (Türen) ergibt sich an diesen Stellen erhöhtes Kerbwirkungsverhalten an den Grenzstellen unterschiedlicher Dichten und besonders nach dem Einbringen von Bohrungen innerhalb eines Hochdichtebereichs;
• b) Fleckenähnliche Überstreuungen führen im Presseneinlauf, besonders bei mittleren und dünnen Produktionsdicken, vermehrt zu Ausbläsern im Presseneinlauf der nachfolgenden Presse;
• c) Die Herstellung einer partiellen fleckenartigen Flächengewichtserhöhung ist in hohem Maße fehlerbehaftet, was bei zu geringer Flächengewichtserhöhung zum Verlust des gewünschten Vorteils und bei zu hoher Flächengewichtserhöhung (durch Anstreufehler) zu Notabschaltungen bei einer kontinuierlichen Produktion führen kann, da die lokale maximale Flächengewichtserhöhung die zulässigen Grenzwerte in einer kontinuierlich arbeitenden Presse überschreiten und
• d) zusätzlich führen unregelmäßig über die Breite einer Pressgutmatte angeordnete lokale Flächengewichtserhöhungen zu Biegeeffekten in den Wälzlagern (Rollstangen) einer kontinuierlich arbeitenden Presse.

The proposed longitudinal spread of excessive density or area weight ranges has proven itself, as these are usually carried out continuously and is only set once. However, it has been shown that the proposed interval scattering for the areas between the scattered longitudinal stripes has defects. There are particularly serious disadvantages in partial or local basis weight increases (stain-like):

• a) Are these locally very narrow and they have compared to the longitudinal and transverse symmetry lines narrow radii of curvature, resulting in poor transverse tensile strength and inadequate values in the longitudinal stiffness; In the case of oscillating permanent loads (doors), there is an increased notch effect at these points at the boundary points of different densities and especially after the introduction of bores within a high density area;
• b) Stain-like scattering leads in the press inlet, especially at medium and thin production thicknesses, increasingly to blowers in the press inlet of the subsequent press;
• c) The production of a partial patch-like basis weight increase is highly error-prone, which can lead to loss of desired benefit and too high basis weight increase (by Anstreufehler) to emergency shutdowns in a continuous production at too low basis weight increase, since the local maximum basis weight increase the allowable limits in a continuous press exceed and
• d) In addition, irregularly distributed over the width of a pressed material mat local basis weight increases lead to bending effects in the rolling bearings (rolling rods) of a continuously operating press.

Will also the scattered chip mat, as usual in many cases and also in the WO 2005 046 950 A1 proposed, precompressed or pretreated by a roller-type pre-press, there are already serious errors here, since in a loose pressed material with stain-like quantity distribution of the grit cracks caused by unintentional displacement of the parts against the compression direction (production direction). He Adding to that, in the case of a roller press, the bending moments can in turn lead to uneven pre-compression and here too the overall quality of the plate suffers.

Another disadvantage are the proposed methods of WO 2005 046 950 A1 in terms of basis weight overshoots in principle. These are sprinkled "just like that" on a pressed material mat by means of nozzles. It inevitably and immediately obvious disadvantages for the skilled person such as:

• - inaccurate arrival and departure behavior selective scattering nozzles,
• - high risk of clogging due to throttling points and glued spreading material at the throttle,
• - Inadequate controllability at different densities Grit species
• - Complex control and control technology necessary,
• - Operating changes time-consuming, provisional shut down nozzles / chokes must be because of the used Binder be cleaned promptly,
• - High maintenance and susceptibility of the Overall system
• - Danger of blockage with alternating pipe conveyors for spreading material
• - Generate unpredictable air turbulence with nozzle scattering Inaccurate scatter pattern and shifts on already lying spreading material or on the already existing grit layers and
• - When multi-layer scattering is punctual Sprinkling a shift of the lower strata obtained, it follow unsightly pressures of heavy, coarse grit from the middle layer to the surface of the cover layers (fine Grit).

Therefore is understandable that a punctual or recurring application of spreading material on a pressed material mat in a highly industrial plant is not possible, as a jetting of chips or particles in no way meet the high demands of today Spreaders and production processes are sufficient. Because since For a long time, the goal is to achieve 100% accuracy. So far, one reaches about 93 according to the current state of the art up to 98% straightening accuracy, depending on the type of material or material to be produced Product. This spreading accuracy was only achieved by adding value was placed on a continuous dispersion, by their uniformity almost equal to a perfect dispersion. Every intervention in today's spreading machines usually show deteriorations of the Spreading quality.

• – kontinuierlich Längsstreifen mit überhöhter Materialanhäufung erzeugt und
• – alternierend werden zwischen diesen Längsstreifen mittels spezieller Düsenanordnungen Queranhäufungen angeordnet.

A fundamental problem is therefore the different types of litter, the after WO 2005 046 950 A1 to be realized. Several times, a surface spread of the main material is made to produce proper layers and be in a suitable place

• - continuously produced longitudinal strips with excessive accumulation of material and
• - Alternating are arranged between these longitudinal strips by means of special nozzle arrangements Queranhäufungen.

It arise in addition to the above-mentioned scattering problems also still connection error between the longitudinal and the transverse scattering. It can come here to a partial overscatter by at undefined crossings double material in irregular Form is scattered, or there are too small nozzles for the transverse scattering scattering gaps and undefined Distances between a longitudinal track and a arranged Cross track, which in turn produce harmful notch effects (Window cracks).

In order to complete the critical points in the production of a compressible Pressgutmatte from chips and / or particles, a Pressgutmatte with local increases not only the risk that they are classified as a threat to a continuously operating press and an emergency stop is initiated, but by local density peaks Bending moments can be introduced into the rolling elements (rolling rods) of a continuously operating press, such as 7 clearly in a top and side sectional view represents. In addition to the risk of rolling bar run such initiated bending moments significantly reduce the life of the rolling rods.

The Task for a procedure to be created and an associated Plant is a Pressgutmatte in the catchment area of a produce continuously working press on a forming belt, the necessary features of a basis weight increase in length and width, without litter quality to relax according to the known state of the art. simultaneously should be ensured with a grit made by the process be that no harmful surface weight excesses occur on the forming belt and across the width of the Pressgutmatte set basis weight overshoots a minimum load for the machine elements have a continuously operating press.

The solution to the method consists in that scattering of at least one uniform layer of a pressed material mat with at least one scattering device on a forming belt leading to the press, adjustment of at least one basis weight increase along the production direction for producing a differentiated Fiächenge Gewichtssprofils transversely to the production direction by removal of grit in at least one track from the previously spread Pressgutmatte means of at least one adjustment and control of spaced Flächengewichtserhöhungen transverse to the production direction for producing a differentiated basis weight profile parallel to the production direction by reducing the removal of grit in at least one track from the previously spread Pressgutmatte by means of at least one adjustment.

The Solution of the task for a plant is to that to control the necessary basis weight increases the basis weight profiles and for the adjustment of the basis weight profiles one Control and regulating device with an associated measuring device is arranged, wherein the control and regulating device based on the tracks for setting the manipulated variables with connected to the adjusting devices in the spreader.

The The present invention preferably relates to the preparation of MDF material boards, of course, can also be in others Manufacturing processes, such as OSB or chip are applied. It should be emphasized that in multilayer scattering processes preferably one or more of the middle layers are strewn through before the adjusters a decrease of tracks or areas he follows. The removal of material from a Pressgutmatte about the surface is a fair average over the basis weight to adjust the width of the pressed material mat. With simple means Thus, the adjustment of the tracks is possible, the basis weight profile in length, consisting of across the width, preferably evenly, arranged basis weight increases, is with equally simple means. To emphasize is also, that this pressed material mat and its basis weight settings not carried out on intermediate conveyors as an intermediate mat and finally this mat again on a form band which, incidentally, is also a significant advancement represents the state of the art.

One decisive advantage over the prior art is seen in a further preferred embodiment. This will be at an existing basis weight increase in the tracks along the forming belt or parallel to the production direction during the setting of the basis weight profile in the length or when lifting the adjustment selectively only there the basis weight over the Width across the production direction increases, at which still no increase has been carried out. In order to It can be avoided, crossings with double or excessive To produce basis weights in the pressed material mat.

It is precautionary still noted that the resulting high-density intersections in their geometric arrangement not with compared to stain-like stray fields according to the prior art can be. Because intersections with high density weight according to the first embodiment, neither the quality of the plate still machine elements of continuous jeopardizing the working press. By in over regularly the width arranged uniform distributions the intersections that coincide with perpendicular to the production direction start rising weights to the rolling rods, results in a theoretical support distance, so that the Torque absorption on the rolling rods evenly and thus is harmless or in the context of construction engineering Allowed remains.

Yet Applications may be dictated by extreme surface weight increases at the corner edges of a slab produced after division, with respect to the processing as disturbing, especially when Inserting holes or self-tapping screws. on the other hand offer advantages over the prior art doubled basis weights at the corner edges of a finished plate. Especially in the take-home furniture market, but Even with building boards, it often happens that only one person must handle large plate. But also with two persons It happens regularly that edges of a plate be bumped and crumble or ugly be pressed. Doubled area weights At the corners can such impacted corners avoid or at least minimize.

In Advantageously, the scheme is designed in this process uncomplicated and can be easily implemented.

Further advantageous measures and embodiments of the subject matter The invention will be apparent from the subclaims and the following Description with the drawing out.

It demonstrate:

1 a plant according to the invention in a schematic side view starting with a spreading device over an endless forming belt and a subsequent continuously operating press,

2 a plan view of the plant after 1 showing a preferred embodiment and adjustable tracks across the width of the adjuster and correlating tracks of the measuring device,

3 in plan view an illustration of a differentiated basis weight profile across the width of the press material mat with four exposed basis weight increases in the production direction with a new representation of the tracks for setting / measuring the basis weight,

4 in plan view, a representation of a differentiated basis weight profile over the length and width of a pressed material mat with a section similar to 1 and a section through a surface weight increase over the entire width of the press mat with representation of the crossing points simultaneous display of two basis weight profiles across the width in a coordinate system,

5 a section in the length of the pressed material mat after 4 with an associated graphical representation of the basis weight profile in the longitudinal extension,

6 a representation of a plate strand or a material plate after the first dividing cut with possible holes for a side part of a shelf-like driving furniture with marked longitudinal and

7 the representation of the problem or the bending moments of rolling elements of a continuously operating press at patch-like basis weight increases against uniform basis weight increases across the width in section and plan view.

In the 1 and 2 is a plant according to the invention in a schematic view starting with a spreader 8th over an endless form band 15 and a subsequent continuous press 1 shown. In the usual production process, the spreader scatters 8th the incoming grit 35 on the endless form band 15 a pressed material mat 2 from. Depending on the definition, the spreader may 8th thereby also a grit bunker (not shown) include, wherein the supply of grit 35 and whose treatment is not the subject of this application. Usually found in a spreader 8th adjusters 5 . 26 . 36 for the basis weight of the pressed material mat 2 , To 1 is the setting device 5 below the band 15 arranged and the adjustment 26 above the scattered pressed material mat 2 , Depending on the application and design, the adjustment 5 and 26 work together, work separately or be used alternately. Regarding the possibilities in a spreader 8th the area weight of a pressed material mat to be spread 2 to set is always referred to the state of the art. By way of example, can be used as an adjustment 26 a roller with teeth or pins and / or a suction device for removing fibers or chips from the surface of the pressed material mat 2 be arranged to a depth of 0 to 60 mm, if necessary across the width 11 the pressed material mat 2 are made adjustable in sections. The adjustment device 5 can by sections over the width 11 arranged lifting devices (not shown) to be realized. The lifting devices act in such a way that when lifting a lifting device per track 27 against the band 15 less material in the leaking pressed material mat 2 remains, accordingly, the basis weight is lower and whereas, when lowering a lifting device more material corresponding to a higher basis weight in the pressed material mat 2 each track 10 remains. The lifting devices usually have opposite the forming belt 15 Rolling bearing-like elements or roles on. The adjustment device 36 is in production direction 13 in front of the adjusting device 26 arranged. For some production processes, it may be necessary in the production direction 13 seen, in front of a material from the Pressgutmatte 2 decreasing adjustment device 26 another adjustment 36 to arrange. The adjustment device 36 , For example, a transverse pressure roller, usually smoothes the surface of the pressed material mat 2 and can also be intended for given periods of time to the Pressgutmatte 2 to condense more. In the sequence takes a subsequent adjustment 26 , which remains constant in their settings, in this section of the pressed material mat 2 less material, resulting in a higher basis weight in this section. Preferably, the adjustment device 36 also across the width 11 adjustable, according to the tracks 27 , Advantageously, these can be for an optimal adjustment of the basis weight profiles 10 . 12 the adjusting devices 5 . 26 . 36 , also in other embodiments, combine.

Below to the spreader 8th (or even integrated in it, but still in production direction 13 after the adjusting devices 5 . 26 ) follows now a measuring device 7 , which is capable of the basis weight or the density of the pressed material mat 2 to determine in sufficient quality. This measuring device 7 is connected to at least one control and regulating device 28 , The controller controls the control and regulating device 28 the corresponding specifications of the operator, while the regulation of the control and regulating device 28 from the reference size of the operator and from the per track 27 determined actual values control values calculated and accordingly at least one adjustment 5 . 26 . 36 each track 27 or over several tracks 27 stalking. It is crucial that the adjustment devices 5 . 26 a maximum distance of 5 m to the measuring device 7 have to keep the controlled system as short as possible. Preferably should be a distance of less than 1.5 m, based on the length of the pressed material mat 2 to be sought. The measuring device 7 should in a preferred embodiment be designed so that the measurements in sections across the width 11 the pressed material mat 2 in tracks 27 , preferably continuous, are feasible. The control and regulating device 28 then processes each individual track in this embodiment 27 separated for the control of the basis weight profile 12 across the width 11 the pressed material mat 2 and outputs the manipulated values to the corresponding track or section of the adjusters 5 . 26 further. The measuring device 7 preferably consists of at least one X-ray source and / or gamma emitter with a corresponding receiver and evaluation electronics.

Depending on the application, the created Pressgutmatte 2 in a pre-press 22 a pre-compaction and possibly other pretreatments (eg steaming, moistening) before entering the press 1 Experienced. Just before the press 1 usually there is a discharge shaft 16 , in the inferior pressed material mats 2 by means of a reversible transferase 17 can be dropped. As a rule, it is then in production direction 13 an intermediate conveyor 18 the optimum for this is the pressed material mat 2 to the continuously working press 1 to hand over. The continuously working press 1 Finally pressed, mostly under the influence of temperature, the pressed material mat 2 to a plate strand 23 , the end of the press 1 Hardened exit and from a thickness gauge 19 is measured. The press 1 is preferably designed as a double belt press, wherein the steel bands 3 around idler pulleys 24 are guided and opposite each other in a press frame 21 and over supported heating plates 20 form a press nip. The exact embodiments of continuously operating presses are referred to the prior art. It is also conceivable that a clock press is used here. In this case, the Pressgutmatte 2 divided accordingly in advance.

The 3 and 4 show a plan view of a pressed material mat 2 with representation of an exemplary basis weight distribution along and / or transverse to the production direction 13 , 3 shows four basis weight increases 6 in production direction. Here is the sequence of tracks 27 Pictured right, in which across the width 11 the pressed material mat 2 different basis weights in the tracks S1 to Sn can be adjusted. In the example, accordingly, S1, S5, S8 and S12 have a basis weight increase 6 on. This results in a basis weight profile 12 transverse to the production direction as in 4 shown. 4 now shows in detail a Einsteuerung a basis weight profile 12 across the production line 13 and additionally a basis weight profile 10 in production direction 13 , The cuts in 4 are correspondingly shown in sectional views but also in coordinate systems, wherein the coordinate system either the absolute width 11 or the length of the pressed material mat 2 in production direction 13 in the abscissa and the cut basis weight profile 10 or 12 apply over the ordinate. In the process, emphasis was placed on the presentation of the corresponding basis weight increases 6 and 9 placed. In 4 The two illustrations on the right-hand edge specifically represent the double increase in surface weight at the intersections 25 is that either, if desired, or according to the possibilities of the invention can also be avoided. 5 is particularly important, since the representation of the longitudinal section in the coordinate system not only depicts the production direction, but of course can also be considered over time, with the height adjustment of the adjustment 5 . 26 at predetermined time intervals or distances in the direction of production 13 he follows.

In summary, the advantages and preferred embodiments are recognized by the fact that the basis weight increase 9 over the tracks 27 is controlled so that across the width 11 in terms of amount, the same basis weight value in the pressed material mat 2 adjusts and / or the tracks 27 with less basis weight the tracks 27 be aligned with higher basis weight. Alternatively, the value of basis weight increase 9 across the width 11 be set equal, resulting in the already described intersections 25 result. Preferably, the basis weight profile becomes 12 and / or the basis weight profile 10 by means of a measuring device 7 after the spreader 8th measured and according to the specification in the spreader 8th by means of the adjusting devices 5 . 26 be managed. It is understood by those skilled in the art that the terms control and regulation need not be detailed. The person skilled in the art will take the necessary steps to guarantee the proper procedure, with the control in principle affecting the setting of a reference variable, for example the grammage in each track and the spacings / distances of the transversal basis weight increases 9 , wherein the regulation on the resulting actual value of the pressed material mat 2 adjusts accordingly at the adjusting devices in order to produce an optimal result. In this context, it is advantageous when measuring the basis weight profiles 10 . 12 the pressed material mat 2 partially in tracks 27 across the width 11 is irradiated with X-rays or gamma rays and / or that the measurement of basis weight profiles 10 . 12 continuous and / or within 5 meters of the pressed material mat 2 after the adjusters 5 . 26 is measured.

In the production of multi-layer chipboard or oriented scattered plates is the removal of the grit 35 from the pressed material mat 2 preferably carried out after the scattering of a middle layer. The basis weight increases 9 across the production line 13 in the pressed material mat 2 can be tracked over a path-time measurement and the hydraulic elements in the press frame 21 the press 1 at least towards the end of the press 1 , preferably in the calibration range of the press strand 23 be adjusted accordingly. This is also a control or regulating device that measures the actual thickness of the press line by means of the thickness measuring device, preferably in tracks across the width and corresponding correction values to the hydraulic elements in the press 1 passes. For the tracks 27 and for the basis weight increases 6 is preferred that they can be controlled in 100 to 200 mm intervals.

It is advantageous for the further operation, if after the press 1 the locations of the basis weight increases 9 at the plate strand 23 be marked. In 6 For this purpose, an exemplary division pattern of a pressed material mat 2 or a compressed plate strand 23 shown. This results in a large material plate 33 after the first dividing cut. This takes place at the transverse dividing line 32 and corresponds as exactly as possible to the center of a basis weight increase 9 on the pressed material mat 2 , In the final production is now, usually after a certain cooling time, on the dividing lines 32 along the large material plate 33 divided up. Will now, for example, for driving furniture a hole grid 34 needed, so should the parting cuts 32 longitudinally corresponding in the middle of the basis weight increases 6 the pressed material mat 2 be arranged. The holes according to the hole grid 34 then take place close to the edge and are also still within the range of basis weight increases 6 , This makes it possible to make large side walls of a cabinet of a driving furniture, which have a low basis weight as far as possible, but at the fittings or the hole grid 34 have a high density to provide sufficient stability for fittings, connecting screws or for the introduction of the weight of the cabinet in the ground. It may be desirable to cut the dividing lines 32 longitudinal and transverse, a double overshoot of the intersections of basis weight increases 6 and 9 to allow here to obtain a special edge protection in the later split material plate.

In conclusion 7 nor the problematic bending moments or the force vectors 30 at two differently scattered or produced Pressgutmatten 2 On the left is a stain-like overspray of the pressed material mat 2 So a local density increase 31 , which acts in such a way that a large force vector at a specific area of the rolling body 29 in the continuous press 1 acts. An example is the tarnishing of the rolling element on the local density increase 31 and from the local density increase 31 shows off. In contrast, in the right example, a uniform transverse scattering or a surface weight increase 9 Although higher force vectors in or against the production direction over the width, but these are equal to the width of the pressed material mat 2 or the length of the rolling element 29 distributed. On the necessary representation of the steel bands 3 between the rolling elements 29 and the pressed material mat 2 was omitted for the sake of clarity.

The means by which the density of a scattered Pressgutmatte can be changed are not shown in this application, since they already represent a well-known prior art. It should again be noted that the teaching of the invention is that you either the entire adjustment 5 and / or adjusting device 26 temporarily adjusted in height by a basis weight profile 10 obtained with transversely to the production direction arranged basis weight increases. Around intersections 25 if necessary, only the tracks will be synchronized 27 height-adjusted, which have not already established a basis weight increase longitudinally. Preferably, the plant is used to carry out the process, but can also be operated independently.

1

Press

2

press material mat

3

steel strips

4

Umlenktrommel

5

adjustment below

6

Grammage increase in production direction

7

measuring device

8th

spreader

9

Grammage increase across the production line

10

Grammage profile in production direction

11

width

12

Grammage profile across the production line

13

production direction

14

press nip

15

forming belt

16

chute

17

Handover nose (Reversible)

18

intermediate conveyor

19

Thickness measuring device

20

Hot Plates

21

press frame

22

pre-press

23

drive train

24

Umlenktrommel

25

crossing

26

adjustment above

27

traces

28

Tax- and control device

29

rolling elements

30

force vectors

31

local density increase

32

Aufteillinien

33

Material board after the first split section

34

hole pattern

35

grit

36

adjustment above

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - WO 2005046950 A1 [0004, 0006, 0007, 0009]

Claims (14)

Process for the production of material plates, such as chip, chip, fiber or similar wood-based panels and plastic sheets, with a continuously operating press ( 1 ), which are designed as double belt presses with two pressure-transmitting, flexible endless steel belts ( 3 ), which via deflection drums ( 4 ) are guided and about rotating rolling elements ( 29 ) of heating plates ( 20 ) and form a press nip in which one on a forming belt ( 15 ) by at least one scattering device ( 8th ) Grit ( 35 ) scattered press mat ( 2 ) by means of pressure and heat to a splittable plate strand ( 23 ) is cured, characterized by the use of the following method steps: 1.1 scattering of at least one uniform layer of a pressed material mat ( 2 ) with at least one scattering device ( 8th ) on one to the press ( 1 ) leading forming band ( 15 ), 1.2 adjustment of at least one basis weight increase ( 6 ) along the production direction ( 13 ) for producing a differentiated basis weight profile ( 12 ) across the production direction ( 13 ) by removal of grit ( 35 ) in at least one track ( 27 ) from the previously spread press mat ( 2 ) by means of at least one adjusting device ( 5 . 26 . 36 ) and 1.3 control of spaced basis weight increases ( 9 ) across the production direction ( 13 ) for producing a differentiated basis weight profile ( 10 ) parallel to the production direction ( 13 ) by reducing the removal of grit ( 35 ) in at least one track ( 27 ) from the previously spread press mat ( 2 ) by means of at least one adjusting device ( 5 . 26 . 36 ). A method according to claim 1, characterized in that the basis weight increase ( 9 ) over the tracks ( 27 ) is controlled so that across the width ( 11 ) the same basis weight value in the pressed material mat ( 2 ) and / or the tracks ( 27 ) with less basis weight the tracks ( 27 ) are adjusted with higher basis weight. A method according to claim 1, characterized in that the value of the basis weight increase ( 9 ) across the width ( 11 ) is equal to. Method according to at least one of the preceding claims, characterized in that the basis weight profile ( 12 ) and / or the basis weight profile ( 10 ) by means of a measuring device ( 7 ) after the spreader ( 8th ) and according to the specification in the scattering device ( 8th ) by means of the adjusting devices ( 5 . 26 . 36 ) be managed. Method according to at least one of the preceding claims, characterized in that for measuring the basis weight profiles ( 10 . 12 ) the pressed material mat ( 2 ) in sections in traces ( 27 ) across the width ( 11 ) is irradiated with X-rays or gamma rays. Method according to at least one of the preceding claims, characterized in that the measurement of the basis weight profiles ( 10 . 12 ) continuously and / or within 5 meters of the pressed material mat ( 2 ) after the adjusting devices ( 5 . 26 . 36 ) is measured. Method according to at least one of the preceding claims, characterized in that in the production of multi-layer chipboard or oriented scattered plates, the removal of the material to be spread ( 35 ) from the pressed material mat ( 2 ) is performed after the dispersion of a middle layer. Method according to at least one of the preceding claims, characterized in that the basis weight increases ( 9 ) across the production direction ( 13 ) in the pressed material mat ( 2 ) are tracked over a distance-time measurement and the hydraulic elements in the press frame ( 21 ) the press ( 1 ) at least towards the end of the press ( 1 ) are adjusted accordingly. Method according to at least one of the preceding claims, characterized in that after the press ( 1 ) the locations of the basis weight increases ( 9 ) on the plate strand ( 23 ). Method according to at least one of the preceding claims, characterized in that the basis weight increases ( 6 ) can be controlled in 100 to 200 mm intervals. Plant for the production of material plates, such as chip, chip, fiber or similar wood-based panels and plastic sheets, with a continuously operating press ( 1 ) and at least one scattering device ( 8th ) for creating a scattered press mat ( 2 ), characterized in that to control the necessary basis weight increases ( 6 . 9 ) of the basis weight profiles ( 10 . 12 ) and for the adjustment of the actual values of the basis weight profiles ( 10 . 12 ) a control and regulating device ( 28 ) with an associated measuring device ( 7 ) is arranged, wherein the control and regulating device ( 32 ) relative to the tracks ( 27 ) for setting the manipulated variables with the adjusting devices ( 5 . 26 . 36 ) in the spreading device ( 8th ) connected is. Plant according to claim 11, characterized gekenn records that as a measuring device ( 7 ) a transmission device, preferably an X-ray or gamma ray device, is arranged with a corresponding receiving arrangement and evaluation. Installation according to claim 11, characterized in that for the production of layered chipboard or OSB boards with a plurality of scattering devices ( 8th ) for different layers only in or after the spreader ( 8th ) for the middle layer adjusters ( 5 . 26 . 36 ) are arranged. Plant according to claim 11, characterized in that a track ( 27 ) has a width of 100 to 200 mm.