EP3294512B1 - Apparatus and method for continuous prouction of materials - Google Patents

Description

The invention relates to a device for the continuous production of materials, preferably for the production of material plates of substantially non-metallic material, according to the preamble of claim 1.

The invention further relates to a process for the continuous production of materials, preferably for the production of material plates of substantially non-metallic material, according to the preamble of claim 10.

The compression of comminuted or open-digested biomass, wood or wood-like materials to material plates is known. Examples of such material panels are MDF panels of medium density fibers, oriented chipboard (OSB), veneer panels (LVL, OSL), fiber insulation panels / mats or the like. To increase the production capacity of continuously operating presses, it is also known to heat the material scattered to a web or strand with suitable devices prior to entry into the press. Due to the higher heat at the beginning of the compression, the press requires less time to heat the fleece. Accordingly, the press can be made shorter or operated faster. Hot air or steam preheating or the use of high-frequency radiation (HF, MW) for preheating in microwave continuous furnaces, referred to below as the continuous flow furnace, have proven successful. The physical principle is based on the conversion of electromagnetic energy into heat energy in the absorption of microwaves by the material to be heated.

With WO 2005 046 950 A1 For example, a particle or chipboard and a method for its production has become known. 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 is provided, the plate basically with low Produce material content, with only a higher proportion of material to be scattered at the locations of the plate, which is later required for the incorporation of fittings or fasteners to make connections with other parts. For this purpose, it is proposed to continuously scatter a higher proportion of material on the forming belt or on the already existing lower cover layer in the longitudinal direction or in the production direction of the pressed product mat in order to obtain in the production direction spaced tracks with higher material input of Pressgutmatte after manufacturing 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 strand of strand particleboard having a higher density for mounting fittings or fasteners but using less material and density in the area.

In the production of the nonwoven, a basis weight profile is produced across the width or length of the nonwoven, which of course can also generate different nonwoven heights in consequence. In this case, the density (at different heights) does not necessarily have to be different. If, however, the nonwoven is pressed uniformly across the width, or passes through a press nip which is uniform across the width, it will have different densities due to the different basis weights.

In addition to the problems in the production of a nonwoven fabric difficulties have shown in the compression of a nonwoven with different basis weights. In particular, it is problematic that a continuously operating press with rotating steel belts tends to steel belt run, as different pressures over length and width on the steel bands and possibly. Act on the rolling support. On the other hand, problems arise in the heat transfer from the hot steel strips in the web, because the different dense Areas in the uniform press nip of the web also behave differently in terms of heat transfer behavior. It has been shown that, despite the average lower density, a pressed material mat with a differentiated density profile over the length and / or width requires just as long to cure, as in the case of a press material mat without density sinks.

Even if the problem of the steel strip course does not occur in the first instance in a cycle press, the disadvantage here is that the pressing must take so long until the material plate has completely set in all areas.

A method and apparatus for heating a web before a press is known from EP 2 247 418 B1 known. In this disclosure, it is proposed that 20 to 300 microwave generators with a magnetron power of 3 to 50 kW and a frequency range of 2400 - 2500 MHz are to be arranged in a continuous furnace per press surface side. The large number of generators and the frequency used, which are necessary for the device and the method advantageously result in a small size of the radiation openings in the boiler room at the microwave frequency used. The disclosure teaches the skilled person only that a plurality of microwave generators are used with the same power and should be controlled accordingly evenly.

The apparatus and method described in this patent have been proven in industrial use, but can be further improved for industrial application.

It is also generally known to homogenize the microwaves within a boiler room, hereinafter called the radiation room, by means of suitable devices. Such devices are for example metallic rotary blades. Alternatively, the material to be heated can stand on rotating turntables. Even in a continuous furnace charged with several microwave generators, hereafter called magnetrons, such a homogenization of the radiation within the radiation space may be useful, even if the material to be heated by means of a conveyor belt continuously through the Radiation space is performed.

Details regarding safety-relevant embodiments or other embodiments of the lock technology of the continuous furnace for introducing and discharging the material are described in further prior art and are not the subject of the present invention.

In the above-mentioned prior art, a plurality of magnetrons are used to produce the necessary heating of the material. The effort seems justified, since the material can be warmed through without introducing moisture into the material, as would be the case for example with the use of steam. The higher energy input and the associated costs pay off due to the lower specific energy consumption per unit of the end product.

A disadvantage of the above-mentioned prior art, for example, that in case of failure of one or more magnetrons, the operation must be interrupted because the material is heated unevenly.

The above device also has the disadvantage that no width adjustment is provided, since it is assumed that in addition to the loss of radiation in the absorbers, the radiation is predominantly and substantially evenly absorbed in the material.

Next, the above device has the disadvantage that different material widths and heights can be driven by the proposed width and height adjustment of the locks easily in and out of the continuous furnace, but at narrow widths and at the same time large volume of the material, the power loss of the continuous furnace is disproportionate is high.

CN202448195U discloses the features of the preambles of claims 1 and 10.

The object of the present invention is to develop the device and the method so that the disadvantages described above can be avoided. In particular, it should be possible with the continuous furnace to heat different high and / or wide strands of materials optimally and to avoid unnecessary power loss. In an extension of the task, the probability of failure of the device can be reduced by an emergency program in case of failure of one or a few magnetrons is established.

The invention is based on a device for the continuous production of materials, preferably for the production of material plates of substantially non-metallic material, comprising at least one continuous furnace for the continuous heating of material on an endlessly circulating conveyor belt and further comprises a downstream in the production direction press, wherein the continuous furnace has a plurality of magnetrons for generating electromagnetic waves and waveguides with outlet openings for feeding the waves into a radiation space.

According to the invention, the stated object is achieved for the device in that a control or regulating device is arranged for controlling individual or grouped magnetrons in order to operate them with different powers for producing a differentiated power profile, preferably in and / or transversely to the production direction.

Not according to the invention it is recognized that, depending on the application and the embodiment of the device, it may be appropriate to arrange only one track or row of outlet openings at an angle, along and / or transversely to the production direction. The material is preferably present as an endless strand on the conveyor belt and has two surface sides, wherein one of these surface sides rests on the conveyor belt and has at least two edges in the production direction.

The expert has hitherto assumed, as described in the prior art, that the electromagnetic radiation spreads more or less evenly after exiting the waveguide in the radiation space. However, a targeted irradiation of the (fanned out) primary waves (after the exit without reflection) into the material leads to a relatively concentrated local heating. Unabsorbed radiation is eventually deflected or reflected and either absorbed as a secondary wave somewhere in the material or captured by the absorbers.

It is preferably provided that the outlet openings of the waveguide are arranged in at least one substantially parallel plane to the conveyor belt. There may be several levels provided with different distances to the material.

In addition to circular waveguides, rectangular and / or oval waveguides are preferably arranged.

At a plurality of magnetrons the corresponding outlet openings can longitudinally and transversely to the direction of production in rows R1, ..., R _n, R _{n + 1} and S1, ..., S _n, S _{n +} be arranged. ₁

In a staggered arrangement of the outlet openings in the production direction, the surfaces of the outlet openings of the adjacent tracks S _n , S _{n + 1} spaced along the production direction, are arranged adjacent or overlapping. For uniform or targeted heating, it is advisable to arrange as many tracks as possible (parallel to the production direction). In this sense, it may make sense that successive rows have staggered exit openings, so that two or more rows could each define its own trace group.

Preferably, the control or regulating device, starting from the material and / or the product to be produced suitably retrieve given power profiles and set in a continuous furnace. The industrial production plants in question are usually suitable for producing a variety of different products as well as different sizes of a single product. In that regard, it is advantageous if the operator or an automated detection of the incoming material via a control or regulating device can specify a retrievable default setting of the magnetrons.

It can be at least one measuring device for testing the material and / or the product in operative connection with the control or Be arranged control device for controlling or regulating the power of the magnetrons or the power profile. It is particularly advantageous if the measuring device has sections over the width, particularly preferably in the same tracks as the continuous furnace magnetrons / outlet openings, is adjustable. Additionally or alternatively, further preceding devices of the production facility or the control station of the plant can be arranged in operative connection with the control or regulating device for controlling or regulating the power of the magnetrons or the power profile.

Preferably, the measuring device will lift before and after the continuous furnace on the basis weight, the density, the humidity, the temperature, the volume and / or the position of the material on the conveyor belt. The same or similar parameters are measured by the measuring device after the press. Each existing measuring device transmits the measured values to the control or regulating device for automated comparison of the actual values with the predetermined desired values. In particular, the temperature difference .DELTA.T before and after the continuous furnace of importance, and this particular also differentiated across the width at different heights and / or basis weights

As known from the prior art, the material can change its size and in particular its position on the conveyor belt, wherein so far only the lock technology at the inlet and at the outlet of the continuous furnace have been controlled. With the device according to the invention, an influence on the existing magnetrons can now be taken even with a relatively narrow arranged on the conveyor belt material by, for example, operated only the magnetrons above the material. The magnetrons, under whose outlet openings no material is transported, are switched off. As a result of the course of the material on the conveyor belt or a progression of the conveyor belt itself, possibly outside tracks of the magnetrons are automatically removed. or turned on.

In the case of an existing performance profile, however, it will also be necessary to shift it by the corresponding number of tracks according to the position of the material.

Particularly preferred are magnetrons with a power of 0.5 to 20 kW, preferably used up to 6 kW.

A passive and / or active distribution means for the electromagnetic waves can be arranged in the radiation space. Such a distribution means is known as a wobbler (engl.) In the art and usually a sheet of geometric shape, which is arranged in an active version movable (rotatable).

When arranging such a distribution means, it is particularly preferred that means for activating or deactivating the distribution means are arranged in the continuous furnace. By way of example, these means may be suitable for covering or removing the distribution medium from the radiation chamber.

Particularly preferably, the drive, or its control, of the conveyor belt or a measuring device for the speed of the forming belt be arranged in operative connection with the control and regulating device. This should be used to perform a balance between the power clocking and / or the use timing of the magnetrons versus the feed of the material. It should be avoided that caused by the intermittent operation of the magnetron local overheating or insufficiently heated areas in the material.

In order to adapt the continuous furnace to different widths and / or varying position of the material on the conveyor belt, the magnetrons of the tracks arranged outside the material can be correspondingly arranged to be reducible or switchable in their power.

The solution of the problem posed for a method is that the magnetrons are controlled individually or in groups with different powers in order to provide them with a differentiated power profile, preferably in and / or transverse to the production direction to operate.

Preferably, the magnetrons are driven by a control or regulating device. This is particularly suitable for retrieving and setting predefined power profiles based on the material and / or the product to be produced.

Preferably, the material and / or the product can be checked by means of at least one measuring device, preferably in sections longitudinally and / or transversely, and the corresponding measured values of the control or regulating device for controlling or regulating the magnetrons or the power profile can be transmitted.

When setting a power profile or differentiated powers of different magnetrons, a passive and / or active distribution means for the electromagnetic waves in the radiation space can be deactivated during the heating of the material. This deactivation can be carried out, for example, by covering or by moving out of the radiation space.

It may be advantageous in the subsequent compression of the material, if transverse to the production direction, a power profile of the magnetrons is adjusted so that sets a higher temperature of the material, starting from the edges to the longitudinal center line of the material. This is particularly desirable when due to the material, the binder, the moisture in or on the material forms a flow during the pressing, which is directed towards the narrow sides of the material. In this case, the material is additionally heated by the heated fluid flow in the vicinity of the edges. It can now cause the edges of the material to overheat on a uniformly heated material. To avoid this, the edges are heated less strongly.

It may be advantageous in the case of a material with a different basis weight profile across the width, alternatively or in combination, if a power profile of the magnetrons is introduced transversely to the production direction, which takes into account the different grammage profile. Here, the areas with different basis weight with different powers of the electromagnetic waves applied or operated the magnetrons of the overlying outlet openings with different powers.

Alternatively or in combination it can be provided that when using wood or wood-like material with a different basis weight profile across the width of the magnetrons are operated with outlet openings substantially above the higher basis weight with a higher power than the magnetrons with outlet openings above the areas of a lower basis weight.

Alternatively or in combination, in an arrangement of several rows of magnetrons in the production direction in case of failure of a magnetron and its energy input into the material one or more other magnetrons of the associated and / or adjacent tracks by increasing their performance compensate for the failure. If the magnetrons or the continuous furnace are already operated with the maximum possible power, then by switching off the whole series of failures is compensated insofar that the speed of the conveyor belt is reduced accordingly. Thus, it does not lead to undesirable results in the preheating, such as heat or local heating too low.

It may also be advantageous if, with different widths of the material and / or a varying position of the material on the conveyor belt, at least one track on the edge, ie the outside of the track, is correspondingly reduced or switched off in its power.

Alternatively or in combination, in order to increase the redundancy of the device further magnetrons, preferably entire rows (Rx) of magnetrons, may be arranged which are not used in regular operation and can be connected in the event of the failure of a magnetron.

Alternatively or in combination, the control or regulating device is suitable for detecting via a monitoring or detection at the magnetrons or their power consumption, whether the function is guaranteed and will automatically connect more magnetrons with the necessary power, if not.

The control or regulating device is suitable for applying local surface weight increases, in particular surface weight increases occurring transversely to the production direction, in the material via a path / time tracking in the radiation space with a higher power and to control the magnetrons in a corresponding temporal and geometric arrangement.

The device is suitable for carrying out the method but also independently operable.

Reference to the accompanying drawings, details and embodiments of the invention will be explained in more detail.

• Fig. 1 schematische Seitenansicht (oben) und einer zugehörigen schematischen Draufsicht (unten) einer Vorrichtung mit einem in Produktionsrichtung durch einen Durchlaufofen und eine Doppelbandpresse geführten Strang aus Material,
• Fig. 2 eine Draufsicht auf den Deckel des Strahlungsraumes des Durchlaufofens mit einer beispielhaften Anordnung der Hohlleiter,
• Fig. 3 einen Schnitt X3 in Produktionsrichtung nach Figur 2 durch den Strahlungsraum und
• Fig. 4 eine beispielhafte Darstellung eines Leistungsprofils zur Herstellung einer Werkstoffplatte aus lignozellulosem Material und entsprechender Randabschaltung der außen liegenden Reihen an Magnetronen.

In the drawings shows:

• Fig. 1 schematic side view (top) and an associated schematic plan view (bottom) of a device with a guided in the direction of production through a continuous furnace and a double belt press strand of material,
• Fig. 2 a plan view of the lid of the radiation space of the continuous furnace with an exemplary arrangement of the waveguide,
• Fig. 3 a section X3 in the production direction FIG. 2 through the radiation room and
• Fig. 4 an exemplary representation of a power profile for producing a material plate of lignocellulosic material and corresponding edge deactivation of the outer rows of magnetrons.

FIG. 1 shows above a schematic side view and below an associated schematic plan view of a device with a production direction 15 through a continuous furnace 1 and a continuously operating press 2 with two endlessly rotating and the strand-like material 3 by the press 2 pulling steel strips. The material 3 is transported on a conveyor belt 10 from the left through the continuous furnace 1, there heated in a radiation space 14, passed the press 2 and there pressed into a product 8 and cured.

Depending on the embodiment of the device can be arranged for a higher efficiency not only from an upper or lower surface side of a radiation chamber 14, but also from the other surface side a radiation chamber 14 ', the material 3 to apply microwaves. This may be necessary in particular if, due to the lack of penetration of the microwaves from one side, the material 3 can not sufficiently heat through or if the power for heating purposes is to be increased. The continuous furnace 1 has around the radiation space 14 in addition to a shielding housing 11 nor absorber 12, the inlet and outlet side absorb excess microwaves and prevent the leakage of microwaves from the continuous furnace 1 in addition to the only indicated there locks. To adapt to different heights and widths of the continuous material 3, the locks and / or the absorber 12 are height and / or width adjustable.

The device according to the invention has a control or regulating device 17 which is capable of controlling the majority of magnetrons 4 for the production of microwaves in their power. In particular, it is provided that the control or regulating device 17 can control individual or grouped magnetrons 4. Preferably, the control or regulating device 17 is in operative connection with a storage device and / or a computing unit that already contains prescriptions or predetermined frame data for setting the continuous furnace 1 or the magnetrons 4. In particular, calculation bases can be stored here on the basis of which the control or regulating device 17, in conjunction with inputs of the operating personnel with respect to the type of material 3 and / or the product 8 to be produced, realizes proposals or settings with which the continuous furnace 1 in conjunction with the following Press 2 can work in an optimal and harmless for the material 3 area.

In an alternative or combining embodiment 15 measuring devices 16 can be arranged in front of the continuous furnace 1, measuring devices 18 after the continuous furnace 1 and in front of the press 2 for the material 3 in the production direction. Alternatively or in combination be provided to arrange a measuring device 20 for the product 8 at the outlet of the press 2. All these mentioned or possibly further measuring devices have in common that they are in operative connection with the control or regulating device 17 and can transmit their measurement results to them. These measurements are the basis for control or regulating algorithms and causes in the control or regulating device 17 the generation and transmission of corresponding control commands to the continuous furnace 1 or the magnetrons 4 arranged there.

Alternatively or in combination, further preceding devices of the production site or the control station of the installation for transmitting data may be in operative connection with the control or regulating device 17.

These measuring devices 16, 18, 20 may preferably be suitable for making measurements in sections over the width 19 of the material 3 or of the product 8.

How out FIG. 1 can be removed further, the material 3 is applied to the conveyor belt 10 in a height 19 low compared to the height. Preferably, the material 3 is pressed in this width 19 in the subsequent press 2 to the product 8. The material 3 is therefore preferably strand-shaped, has an upper and a lower surface side, wherein a surface side rests on the conveyor belt 10 and forms two edges 7. The position of the edges 7 on the conveyor belt 10 is known to vary, in particular by the belt during the task of the material 3 on the conveyor belt 10, by changes in the trimming or product conversion. Also, the later band profile in the area of the continuous furnace 1 can lead to the fact that the conveyor belt 10 is not always guided in the same position through the continuous furnace 1.

FIG. 2 shows a plan view in the production direction 15 from bottom to top on the lid 22 of the radiation space 14 in a section X2-X2 FIG. 3, FIG. 3 shows the corresponding view of a section X3-X3 through the radiation space 14 after FIG. 2 , where the Production direction 15 is directed to the drawing plane.

In the synopsis of the two Figures 2 and 3 The following configuration of the radiation space 14 results. The magnetrons 4 are preferably arranged separately in a cabinet 13 and laterally of the radiation space 14 for better accessibility, in particular for maintenance or replacement purposes. The cabinet 13 has openings through which the waveguides 5 connected to the magnetrons 4 guide the microwaves to the radiation space 14 and enter them there via the outlet openings 6, corresponding to openings in the lid 22 into the radiation space 14. In the plan view, it can be seen that the outlet openings 6 are arranged in several rows R (R _n , R _{n + 1} ) transversely to the production direction 15 and tracks S (S _n , S _{n + 1} ) along the production direction 15.

The manner of arrangement of the outlet openings 6 on the radiation space 14 is dependent on the use of the continuous furnace 1, the frequency of the microwave radiation, which has an influence on the size of the waveguide 5 and thus on the outlet openings 6, and in particular of the It may therefore be possible to use only a small number of magnetrons 4, wherein at least two must be arranged. These then form a row in any direction. Preferably, however, it is provided that at least a plurality of magnetrons 4 are arranged in a row R and can be controlled by means of the control or regulating device 17 with a differentiated power profile 9. Already a row R, if necessary not necessarily transverse but angular (except parallel) to the production direction allows the differentiated heating of the material 3 across the width 19.

In particular, with a corresponding arrangement and / or orientation of the outlet openings 6 of the waveguide 5, a differentiated heating profile in the material 3 or a differentiated power profile 9 of the magnetrons 4 can be controlled. The possibilities are manifold.

To FIG. 3 a second radiation space 14 'may be provided which first radiation space 14 with respect to the material 3 opposite and thus arranged below the conveyor belt 10. This can preferably have the same configuration of magnetrons / waveguides / outlet openings as the radiation space 14. The material 3 to be heated here has a predetermined width 19 and lies on the moving through the continuous furnace 1 conveyor belt 10. The material 3 is formed substantially strand-shaped has two surface sides and one edge 7 each.

Use of a single track S with one outlet opening 6 per row R:
This results in the possibility of driving the material 3 in the production direction 15 with differentiated powers L, for example an increasing power step (R ₁ = 20%, R ₂ = 40%, R ₃ = 60%, R ₄ = 80%, R ₅ = 100) % at least 5 rows). This can be advantageous if the material 3 is, for example, undercooled or frozen and, if necessary, subjected to water. Alternatively, the power staircase can also be used the other way around, if first a strong heating and then a homogenization of the heat in the material 3 with lower microwave strength should be supported.

Use of a single row R, each with one outlet opening 6 per lane S:
This results in the possibility of driving the material 3 transversely to the production direction 15 with differentiated powers L, for example a rise rising from the edge 7 of the material 3 towards the longitudinal center line 21 (S ₁ = 25%, S ₂ = 50%, S ₃ = 75%). , S ₄ = 50%, S ₅ = 25% with at least 5 tracks). As already stated above, the possibilities are manifold and not all exhaustive.

Using multiple row R _n , R _{n + 1} with exit port 6 and several tracks track S _n , S _{n + 1} after Fig. 2 :
It is possible to set very complex performance profiles L in and across the production direction. This results in a 3D view of a three-dimensional performance profile by setting different Performances in different magnetrons 4. In particular, the space-time component and the degree of heating together with the flow rate during heating respectively in the control or regulating device 17 would have to be considered for optimized heating.

In a simple embodiment according to FIG. 4 for a performance profile 9 will be as in FIG. 3 represented a material 3 of a width 19 through the radiation space 14 promoted. To FIG. 4 and 2 the number of tracks S is equal to 16. By the ability to control all magnetrons 4 individually or in groups, now the magnetrons 4, which are in operative connection with the outlet openings 6 of the tracks S ₁ , S ₂ left and S ₁₅ , S ₁₆ right , deactivated and have a power L = 0%, since they are located directly above an area that is not occupied by the material 3. So that the edge region of the material 3 is only slightly heated, the magnetrons 4 of the tracks S ₃ , S ₄ left and S ₁₃ , S ₁₄ right of the outlet openings 6, which are arranged on the edge 7 of the material 3, with only half the power required L = 40% operated. The lying further inwardly to the longitudinal center line 21 areas of the material 3 are applied with a power L = 80% of the magnetrons and heated accordingly. For this simple application, the subsequent rows Rn + 1 can correspondingly map the same power profile 9 as in FIG FIG. 4 shown.

In an advantageous manner, the use of a plurality of rows R and tracks S in a method for protecting the magnetrons 4 by alternately switching on and off of the magnetrons 4 is possible. Turning on and off does not describe the power timing that is usually used to set the power L of a magnetron, but pausing the magnetrons to maintain performance and prevent overheating, ie, use timing.

In a simple plausible example, the continuous furnace could be operated as follows:
In the calculation of the power required to heat the material to a predetermined temperature results in the use of all existing magnetrons 4, the need to operate at 35% of the rated power, it being assumed for the sake of simplicity that all magnetrons 4 with the same Performance L would work. It is now determined that in an arrangement of the outlet openings 6 as in FIG. 2 n = 6 for R _N and S _n . There are thus 36 outlet openings 6 at six rows R and six tracks S. In order to preserve the magnetrons 4, a running operation is now proposed, in which the magnetrons 4 of all tracks S are used, but the rows R with even n and the R rows with odd n are alternately switched on. For this, the nominal power of the active 18 Magnetrone 4 (36/2) is doubled, so that they are operated with a rated power of 70%. An unnecessary continuous operation of the magnetrons 4 is thus avoided.

LIST OF REFERENCE NUMBERS

1

Continuous furnace

2

Press

3

material

4

magnetron

5

waveguide

6

outlet opening

7

edge

8th

product

9

performance profile

10

conveyor belt

11

casing

12

absorber

13

closet

14

radiation space

15

production direction

16

measuring device

17

Control or regulating device

18

measuring device

19

width

20

measuring device

21

Longitudinal center line

22

cover

R

Row of the outlet openings transverse to 15

S

Trace of the outlet openings in FIG. 15

L

Power of 4

Claims (20)

1. Device for the continuous production of materials, preferably for the production of material panels from essentially non-metallic material, comprising a continuous furnace (1) for the continuous heating of material (3) on an endlessly circulating conveyor belt (10) and a press (2) connected downstream in the production direction (15), wherein the continuous furnace (1) has a plurality of magnetrons (4) for generating electromagnetic waves and waveguides (5) with outlet openings (6) for feeding the waves into a radiation chamber (14), wherein the outlet openings (6) are arranged in rows (R) and tracks (S) longitudinally and transversely to the production direction (15),
   characterized in that a control or regulating device (17) is arranged for actuating individual or grouped magnetrons (4) in order to operate them with different powers (L) for producing a differentiated power profile (9), preferably in and/or transversely to the production direction (15).
2. Device according to claim 1, characterized in that, in the case of an offset arrangement of the outlet openings in the production direction (15), the surfaces of the outlet openings (6) of the adjacent tracks (S) Sn, Sn±1 are arranged in a spaced apart, adjacent or overlapping manner along the production direction (15).
3. Device according to one or more of the preceding claims, characterized in that the control or regulating device (17) is adapted to retrieve predetermined power profiles (9) based on the material (3) and/or the product (8) to be produced and to set them in the continuous furnace (1).
4. Device according to one or more of the preceding claims, characterized in that at least one measuring device (16, 18, 20) for testing, preferably in sections, the material (3) and/or the product (8) or further preceding devices of the production site or the control station of the plant are arranged in operative connection with the control or regulating device (17) for controlling or regulating the power (L) of the magnetrons (4) or the power profile (9).
5. Device according to one or more of the preceding claims, characterized in that the drive of the conveyor belt (10) or a measuring device for the speed of the conveyor belt (10) is arranged in operative connection with the control and regulating device (17), in particular for calibrating the power timing and/or the use timing of the magnetron (4) with respect to the feed of the material (3).
6. Device according to one or more of the preceding claims, characterized in that, in order to adapt the continuous furnace (1) to different widths (19) and/or varying positions of the material (3) on the conveyor belt (10), the magnetrons (4) of the tracks (S) arranged outside the material (3) are arranged such that their power (L) can be reduced or switched off.
7. Device according to one or more of the preceding claims, characterized in that, in order to increase the redundancy of the device, further magnetrons, preferably entire rows (Rx) of magnetrons, are arranged which can be switched on accordingly in the event of the failure of magnetrons.
8. Device according to one or more of the preceding claims, characterized in that the control or regulating device (17) is suitable for monitoring or detecting power restrictions or defective magnetrons, and the necessary power or further magnetrons are automatically switched on via said device.
9. Device according to one or more of the preceding claims, characterized in that the control or regulating device (17) is adapted to apply a higher power (L) to local basis weight increases, in particular basis weight increases occurring transversely to the direction of production, in the material (3) via path/time tracking and is adapted for a corresponding activation of the magnetrons (4).
10. Method for the continuous production of materials, preferably for the production of material panels from essentially non-metallic material, comprising a continuous furnace (1) for the continuous heating of material (3) on an endlessly circulating conveyor belt (10) and a press (2) connected downstream in the production direction (15), wherein the continuous furnace (1) has a plurality of magnetrons (4) for generating electromagnetic waves and waveguides (5) with outlet openings (6) for feeding the waves into a radiation chamber (14), wherein the outlet openings (6) are arranged in rows (R) and tracks (S) along and transversely to the production direction (15),
    characterized in that the magnetrons (4) are actuated individually or in groups with different powers (L) by a control or regulating device (17) in order to operate them with a differentiated power profile (9), preferably in and/or transversely to the production direction (15).
11. Method according to claim 10, characterized in that the control or regulating device (17) is adapted to retrieve and set predetermined performance profiles (9) based on the material (3), the structure of the material (3) and/or the product (8) to be produced.
12. Method according to claim 10, characterized in that the material (3) and/or the product (8) is checked by means of at least one measuring device (16, 18, 20), preferably in sections longitudinally and/or transversely, and the corresponding measured values of the control or regulating device (17) for controlling or regulating the magnetron (4) or the performance profile (9) are transmitted.
13. Method according to claim 10, characterized in that the speed of the conveyor belt (10) is determined via the drive of the conveyor belt (10) or a measuring device and the measured value of the control and regulating device (17) is transmitted, in particular for calibrating the power timing and/or the use timing of the magnetron (4) with respect to the feed of the material (3).
14. Method according to claim 10, characterized in that, in the case of a material (3) having a different basis weight profile over the width (19), a corresponding power profile (9) of the magnetrons (4) is introduced transversely to the production direction (15), wherein the regions of different basis weight are subjected to different powers of the electronic magnetic waves.
15. Method according to claim 10, characterized in that, when using wood or wood-like material (3) having a different basis weight profile across the width (19), the magnetrons (3) with outlet openings (6) substantially above the regions of higher basis weight are operated with a higher power (L) than the magnetrons (4) with outlet openings (6) above the regions of lower basis weight.
16. Method according to claim 10, characterized in that, in the case of an arrangement of a plurality of rows (R) of magnetrons (4), in the event of failure of a magnetron (4) and its energy input into the material (3), one or more other magnetrons (4) of the associated and/or adjacent tracks (S) compensate for the failure by increasing their power (L) or, in the case of maximum power (L) of the magnetron (4), the failure is compensated for by switching off the entire row (R) and the speed of the conveyor belt (10) is reduced correspondingly.
17. Method according to claim 10, characterized in that at different widths (19) of the material (3) and/or varying position of the material (3) on the conveyor belt (10) at least one track (S) of the magnetrons (4) arranged at the edge (7) is reduced correspondingly in its power (L) or switched off.
18. Method according to claim 10, characterized in that, in order to increase the redundancy of the device, further magnetrons, preferably entire rows (Rx) of magnetrons, are arranged which are not used in regular operation and can be switched on if a magnetron fails.
19. Method according to claim 10, characterized in that the control or regulation device (17) detects the magnetrons or their power consumption via automated monitoring or recognition and the activation of the necessary power or further magnetrons takes place automatically.
20. Method according to claim 10, characterized in that the control or regulating device (17) is adapted to apply a higher power (L) to local basis weight increases, in particular basis weight increases occurring transversely to the direction of production, in the material (3) via path/time tracking, and activates the magnetrons (4) for this purpose in a corresponding temporal and geometric arrangement.

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