EP2236258B1 - Method for producing composite panels in a continuously operating press and continuously operating press - Google Patents

Description

The invention relates to a method for producing material plates in a continuously operating press according to the preamble of claim 1 and to a continuously operating press, in particular for carrying out the method, according to the preamble of claim 14.

Chipboard and the production of material plates from, for example, medium-density fibers are now automated processes and have already been used in many countries for many years. As in " Wood materials, production and processing "by Hansgert Soiné, DRW-Verlag 1995, pages 17ff described, the compression of processed chips or fibers takes place either clock-bound or continuous. In addition to the many plant components before and after the press, the production of a pressed material mat by means of spreading machines plays an outstanding role Quality of the produced press mat besides the quality of the raw materials is an important factor.

The preparation of a pressed material mat is done in advance by scattering the treated material on a forming belt by means of spreaders, then followed by a control of the pressed material mat by means of a basis weight scale and / or a density control. Furthermore, magnetic separators and search coils as metal detectors, pre-compression for pre-compression, Besäumungsvorrichtungen the long sides of the pressed material mats and finally a special transfer belt that introduces the Pressgutmatte at a predefined location in the inlet wedge compressor of the continuously operating press in such production plants. In these presses, as in DE 39 13 991 C2 described, the pressing force is transmitted by hydraulic actuators on the press and heating plates and further on steel belts, which are supported by a rolling element carpet (rolling rods) circumferentially arranged on the pressed material.

It has emerged in recent years of technological development that a critical component of a continuous press is the inlet area. Two fundamentally different solutions have emerged. A solution for the exact definition of the inlet profile is to arrange in the inlet area bendable Einlaufheizplatten by means of hydraulic actuating means can be adjusted and thus cause a more or less strong inlet gradient ( DE 34 13 397 ). An exemplary further development is to quickly clamp the pressed material mat in an inlet region between the steel strips and to effect a controlled ventilation or the like by means of bending in the longitudinal direction of the inlet plates. For this purpose, different adjusting devices are arranged above a press, preferably double-acting, which introduce different bending moments into the inlet heating plate in the direction of production.
DE 198 24 723 discloses a method according to the preamble of claim 1 and a continuous press according to the preamble of claim 14.
Another way has been a parallel development of the inlet area. In DE 43 01 594 C2 is a continuously operating press and a method for continuous production described in this disclosure, a so-called two-stage inlet wedge compressor as part of the continuous press the pressed material takes over from a conveyor belt and strongly compressed according to a predetermined main compaction through the upper steel strip in the inlet. Here, the compression of the material to be pressed in the inlet region in two pressing stages by variable Winkeleinsteuerungen two flexible and articulated interconnected, acting as pressure plates support beams performed in the first pressing stage a slight to strong compression and in the second a strong compression or relief on the pressed material acts. The transitions from the first pressing stage to the second pressing stage and from the second pressing stage to the main pressing area can be set to convex or concave become. With DE 100 45 681 A1 was this infeed wedge compressor further developed, in which case the known upper part of an inlet wedge compressor with two joints and two separate compression areas KV1 and KV2 continues to apply, but the lower inlet pressure plate from the mat contact to the beginning of the main press area is integrally and rigidly provided with an oversized radius of curvature, the It is designed to be bendable by means of hydraulic short-stroke cylinders. Thus, the inlet wedge compressor should be able to be adjusted flexibly to the necessary parameters when using different types of press material mats and thicknesses.

Usually, different compression strategies are now used in the inlet of continuously operating presses, wherein preferably either a slow linear compression from Pressgutmattenkontakt is carried out to the final thickness of the material plate or rapid compression after Pressgutmattenkontakt to almost the final thickness. These strategies are directly dependent on the height of the incoming pressed material mat, its condition and its production speed (feed). In principle, it can be stated that high pressed material mats for the production of thick material plates (more than 16 mm) are driven at a low production speed (generally less than 750 mm / s) through a continuously operating press. Thinner material plates under 16 mm require a short residence time in the continuous working Press under pressure and heat and thus a higher production speed. Extremely high feed speeds (up to 2 m / s) are generally used for thin-plate production below 4 mm final thickness and, if necessary, pre-compacted pressed material mats with a height of 10 to 100 mm are pressed. The pressed material mats in the inlet wedge compressor are compressed within a possible length of the inlet area of 4 m to almost the final thickness. Extremely fast compression can lead to blowouts or backflow of the material to be pressed in calender presses or in poorly adjusted inlet areas or inlet wedge compressors of any kind in continuous double belt presses. Blowers are created by the air flowing counter to the direction of production, especially when there is flow congestion of the air. The result is Pressgutmattendopplungen or protuberances by explosive blowers on the outer layers, which can lead to local damage (imprints) on the steel strip with their excessive density. The result is a recurring poor surface quality of the final product through this fault in the steel strip, which must be repaired cumbersome or lead after a variety of flaws in the steel strip to a replacement of the steel strip.

Experience has shown that the inlet wedge compressors and previous compression or manufacturing processes according to the above-described prior art in the production of MDF or chipboard in the thick and thin production area are only partially suitable to achieve optimal ventilation. This is due to the very high amount of trapped air in the pressed material mat, which can be vented only limited by pre-pressing, since the pressed material mat tends to spring up after a pre-press. To make matters worse, that in principle in the material plate production by low blowouts in the top layer dust swirling occur before the mat contact point, which can lead to streaking of the surface. If the highest possible production speed is selected, in which larger blow-out blowers do not occur at all or occur only very rarely, the high flow velocities emerging on the large surface sides can lead to partially high flow velocities, which result in a shift of smaller cover layer areas and appear as microcracks in the cover layer to make noticable. Again, in addition to the wedge effect of microcracks, the problem of poor surface quality, especially in the manufacture of thin plates.

The invention is based on the object of providing a method for compacting a pressed product mat in a continuously operating press, which is capable of allowing an optimized venting of the pressed product mat in the inlet region counter to the production direction and at the same time enables a simpler setting of the inlet region. At the same time one should continuously operating press to carry out the procedure to be created.

The solution to this problem for the method is that during the passage through the inlet area at least in a section in the production direction the pressed material mat from a surface side with a transverse to the production direction substantially linear inlet heating or at least two transversely to the direction of production substantially linear hinge plates and the opposite surface side with a bent at least in the region of the longitudinal center line in the direction of the pressed material mat transverse to the direction of production Einlaufheizplatte and / or is compressed.

1. A) die für eine Verbiegung und/oder Aufwölbung zumindest an einer Stelle kraft- und/oder formschlüssig an zumindest einem Teil des Pressengestells fixiert und durch eine entsprechende Unterlage statisch verbogen angeordnet ist und/oder
2. B) für die für die Lagerung mehrere hydraulische Stellvorrichtungen angeordnet sind und für die zur mindestens anteiligen Verbiegung und/oder Aufwölbung der Einlaufheizplatte zumindest Teile einer Reihe Stellvorrichtungen in Produktionsrichtung mit einem größere einstellbaren Hubweg und/oder einem größeren einstellbaren Druck gegenüber den anderen Stellvorrichtungen der Reihe angeordnet sind und wobei für den Rückzug der Einlaufheizplatte in Richtung Pressengestellt Rückzugsmittel mit Anschlägen zwischen einem Teil des Pressengestells und der Einlaufheizplatte angeordnet sind und/oder
3. C) für die für eine schwimmende Lagerung mehrere hydraulische Stellvorrichtungen angeordnet sind und für die zur mindestens anteiligen Verbiegung und/oder Aufwölbung zumindest in einem Teil einer Reihe der Stellvorrichtungen in Produktionsrichtung hydraulische Stellvorrichtungen mit einem größeren maximalen Hubweg angeordnet sind als in der benachbarten Reihe.

The solution of the problem set for a continuously operating press for carrying out the method is that an inlet heating plate is arranged in the inlet region,

1. A) fixed for bending and / or buckling at least at one point non-positively and / or positively on at least part of the press frame and is arranged statically bent by a corresponding pad and / or
2. B) for the storage for a plurality of hydraulic adjusting devices are arranged and for the at least proportional bending and / or buckling of the Einlaufheizplatte at least parts of a row Actuators are arranged in the direction of production with a larger adjustable stroke and / or a greater adjustable pressure compared to the other actuators of the series and wherein arranged for the withdrawal of the Einlaufheizplatte in the direction Pressed retraction means with stops between a part of the press frame and the Einlaufheizplatte and / or
3. C) for which a plurality of hydraulic adjusting devices are arranged for a floating storage and for the at least proportional bending and / or buckling at least in a part of a row of adjusting devices in the direction of production hydraulic adjusting devices are arranged with a larger maximum stroke than in the adjacent row.

In addition to a combination of all three different system features, the features A) to C) can also be arranged in each case independently and alone to bend the Einlaufheizplatte.

With the solution according to the invention for the process and for the continuously operating press, which can also be operated separately from the method independently according to the teaching, the following advantages in the production of material plates from Pressgutmatten by a clean and continuous forced ventilation. For this purpose, preferably in the longitudinal direction (in the production direction) in the middle of the pressed material mat a Einlaufheizplatte deliberately bent so that compared to the narrow sides of the Pressgutmatte in the middle of a higher or faster compression is achieved. As a result of this short or, if necessary, also longer acting stronger compression in the middle of the pressed material mat opposite the edge regions, the air receives a vectorial impulse which can cover an angular range from opposite to the production direction up to the production direction, which lies substantially in the plane of the pressed material mat , For thick or high Pressgutmatten this effect to advantage, but it should be emphasized that this type of controlled venting can be performed in the inlet area in pressed material mats that develop little or no backpressure against the Einlaufheizplatten, or for optimal ventilation in the beginning of the inlet wedge compressor are merely clamped or clamped. This clamping or entrapment is preferably carried out almost without pressure and should prevent escape in this area, the air currents on the surface side of the pressed material mat. Thus, the air currents are forced to avoid in the direction of the narrow sides and there occur to the environment of the pressed material mat. This advantageous embodiment of the vent is especially true for pressed material mats, which have a height of less than 75 mm, preferably less than 40 mm. The method is also particularly suitable for production speeds of over 1 m / s.

1. a) es wird eine schonende und optimierte Entlüftung in der ersten Verdichtungszone über die Schmalflächen der Pressgutmatte erreicht,
2. b) Ausbläser in den oberen Deckschichten der Pressgutmatte werden vermieden,
3. c) Staubverwirbelungen über den Deckschichten der Pressgutmatte direkt vor dem Mattenkontaktpunkt treten nicht auf, somit ergibt sich eine optimale und gleichmäßige Oberflächenstruktur und -färbung,
4. d) der Bereich oberhalb der Pressgutmatte kurz vor dem Mattenkontaktpunkt kann mittels einfacher Lichtschranken auf Ausbläser oder Pressgutmattenüberhöhungen überprüft werden, was normalerweise wegen der Staubverwirbelungen durch ausströmende Luft vor dem Mattenkontaktpunkt nicht möglich wäre und
5. e) die Brandgefahr durch Staubaufwirbelungen ist im Einlauf erheblich reduziert.

Finally, there are the following advantages over the prior art:

1. a) a gentle and optimized venting is achieved in the first compression zone over the narrow surfaces of the pressed material mat,
2. b) Blowers in the upper cover layers of the pressed material mat are avoided
3. c) dust swirling over the cover layers of the pressed material mat directly in front of the mat contact point does not occur, thus resulting in an optimal and uniform surface structure and coloration,
4. d) the area above the Pressgutmatte just before the mat contact point can be checked by means of simple photoelectric sensors on Ausbläser or Pressgutmattenüberhöhungen, which would normally not possible due to the dust turbulence due to escaping air in front of the mat contact point and
5. e) the risk of fire due to the raising of dust is considerably reduced in the inlet.

At the same time, in the newly created continuous press for carrying out the method according to the invention, it is also possible to produce thick material plates of very high press material mats more than 75 mm in height, without having to accept a loss of quality compared with the previous production systems. Accordingly, the newly created continuously operating press can also be operated independently without the method according to the invention with success, having the characterizing features.

With regard to the press technology, the practice has been customary for more than a decade to adjust or bend the inlet plates or the hinge plates in the inlet region in the longitudinal direction or in the direction of production. This is to achieve optimum ventilation. Incidentally, in the many different methods, the different pressure and compression parameters are in the foreground, for example in targeted steam injection techniques with relatively moist pressed material mats, different compression profiles for setting the cover layer densities compared to the middle layer density and much more.

It has been found that the known prior art teaching on the bending of the inlet plates or hinge plates is limited to keywords such as "wedge-shaped", "trumpet-shaped" or "cone-shaped" inlet region. The teaching behind the last-mentioned terms and the prior art consisted of compressing the narrow sides of the pressed material mat stronger in order to avoid blowouts from the narrow sides, which in turn reinforced blowers on the surface sides by venting with the dangers described opposite to the direction of production for the steel bands. In such inlet profiles, the inlet and the hinge plates are bent mainly in the longitudinal and transverse directions. The disadvantage here is especially the Multiaxialverbiegung of quite rigid metal plates, which is neither easy to handle, is still easy to carry out.

The present invention takes a different approach here, in that preferably only one inlet heating plate is bent transversely to the direction of production to form a bulge or transverse bending, or stationary bent and the opposite inlet heating plate is linearly transversely to the production direction, out of its inclination (also stationary), or active is held. This is not contradicted by the possibility of adjusting an inlet profile in the longitudinal direction by bending the inlet plates in the longitudinal direction for adjusting the height of the inlet gap, since a curvature in the longitudinal direction, for example, a curvy profile is set, but in the transverse direction a linear, parallel to the rolling rods, Line should be kept. It thus results in bent inlet plates no plane level. In contrast, hinge plates are not usually designed to be bent transversely to the direction of production because of problems with the joint connection to the subsequent hinge or press plate (main press area). For this reason, the present teaching is particularly applicable to this type of continuously operating presses, wherein the opposite inlet heating, usually arranged below, in the longitudinal direction may have a fixed inlet radius. In particular, such a Einlaufheizplatte is particularly suitable for bending transversely to the production direction.

Further advantageous measures and embodiments of the subject matter of the invention will become apparent from the dependent claims and the following description with the drawing.

Figur 1

In schematischer Darstellung die Seitenansicht einer kontinuierlich arbeitenden Presse mit einlaufseitig in Produktionsrichtung angeordneten verbiegbaren Einlaufheizplatten im Einlaufbereich (I/II) und nachfolgenden Press-/Heizplatten für den Hauptpressbereich (III),

Figur 2

in einer seitlichen vergrößerten schematischen Darstellung des Einlaufbereichs einer kontinuierlich arbeitenden Presse bei der Entlüftung einer Pressgutmatte mit einem gestuften Einlaufkeilverdichter im Einlaufbereich (I/II) oben und einer Einlaufheizplatte unten,

Figur 3

eine Ansicht in Produktionsrichtung mit Darstellung eines Biegeprofils respektive einer Verbiegung einer unteren Einlaufheizplatte quer zur Produktionsrichtung,

Figur 4

eine Darstellung eines weiteren bevorzugten Biegeprofils, respektive einer Aufwölbung einer unteren Einlaufheizplatte quer zur Produktionsrichtung,

Figur 5

eine schematische Darstellung eines gestuften Einlaufkeilverdichters nach Figur 2 mit Darstellung einer möglichen Verbiegungskontur bzw. einer Aufwölbung der unteren Einlaufheizplatte gegenüber den starren Gelenkplatten oben,

Figur 6

eine Ansicht in Produktionsrichtung mit Darstellung einer statischen Verbiegung durch eine Unterlage und außen liegenden Verspannung der unteren Einlaufheizplatte,

Figur 7

einen Schnitt in Produktionsrichtung mit einer Vorderansicht eines Pressengestell mit Darstellung eines Pressengestells mit Anordnung der Stellmittel zur Verbiegung einer Einlaufheizplatte quer zur Produktionsrichtung,

Figur 8

eine perspektivische Darstellung eines Pressengestells mit einer vergrößerten Darstellung der Druckisolierungen und einer möglichen Anordnung der Stellvorrichtungen unterhalb einer nicht dargestellten unteren Einlaufheizplatte,

Figur 9

ein weiteres Ausführungsbeispiel einer schwimmend gelagerten Einlaufheizplatte auf beispielsweise drei Stellvorrichtungen im unteren Totpunkt,

Figur 10

die Einlaufheizplatte nach Figur 9 im oberen Totpunkt der beiden äußeren Stellvorrichtungen mit vorzugsweise geregelter Druck- und/oder Wegregelung der mittleren Stellvorrichtung (nicht im oberen Totpunkt) und

Figur 11

die Einlaufheizplatte nach Figur 9 mit allen Stellvorrichtungen im oberen Totpunkt, wobei durch den verlängerten Hub der mittleren Stellvorrichtung respektive mehrerer Stellvorrichtungen in der Längsmittenlinien, eine Verbiegung der unteren Einlaufheizplatte erreicht wird.

Show it:

FIG. 1

Schematic representation of the side view of a continuously operating press with inlet side arranged in the direction of production bendable Einlaufheizplatten in the inlet area (I / II) and subsequent press / heating plates for the main press area (III),

FIG. 2

in a side enlarged schematic representation of the inlet region of a continuously operating press in the venting of a pressed material mat with a stepped inlet wedge compressor in the inlet region (I / II) above and a Einlaufheizplatte below,

FIG. 3

a view in the production direction with representation of a bending profile or a bending of a lower Einlaufheizplatte transverse to the production direction,

FIG. 4

an illustration of a further preferred bending profile, respectively a bulge of a lower Einlaufheizplatte transverse to the production direction,

FIG. 5

a schematic representation of a stepped inlet wedge compressor after FIG. 2 with a representation of a possible bending contour or a bulge of the lower inlet heating plate in relation to the rigid hinge plates above,

FIG. 6

a view in the production direction with a representation of a static deflection by a base and external tension of the lower Einlaufheizplatte,

FIG. 7

a section in the production direction with a front view of a press frame showing a press frame with arrangement of the adjusting means for bending a Einlaufheizplatte transverse to the production direction,

FIG. 8

a perspective view of a press frame with an enlarged view of the pressure insulation and a possible arrangement of the adjusting devices below a bottom Einlaufheizplatte, not shown,

FIG. 9

a further embodiment of a floating mounted Einlaufheizplatte on, for example, three actuators at bottom dead center,

FIG. 10

the inlet heating plate after FIG. 9 at the top dead center of the two outer adjusting devices with preferably regulated pressure and / or path control of the central adjusting device (not at top dead center) and

FIG. 11

the inlet heating plate after FIG. 9 with all adjusting devices at top dead center, wherein a deflection of the lower Einlaufheizplatte is achieved by the extended stroke of the central actuator respectively a plurality of adjusting devices in the longitudinal center lines.

In the drawing has been dispensed with a complete picture of a continuous press with every detail. The already explained and fully underlying prior art is known in the art, so that a schematic view FIG. 1 to illustrate the manufacturing process, especially in conjunction with FIG. 2 sufficient.

In FIG. 1 schematically the overall structure of the continuously operating press 1 is shown, each having two endlessly circulating steel belts 2 and 3, which are guided around idler pulleys 10 in a basic structure. A Pressgutmatte 7 is introduced into the inlet region I / II, which in the prior art usually on a forming belt (not shown) by means of a spreader (not shown) scattered and possibly after a pre-compression by means of a pre-press (not shown) is compressed , In the embodiment according to FIG. 1 Einlaufheizplatten 16 are arranged at the top and bottom, which as already described for setting the usually mentioned inlet wedge compressor (wedge shape, basically means up and down not bent in the transverse direction but only set in the longitudinal direction or bent Einlaufheizplatten 16). The division of the inlet region into a first and second inlet region I, II is based on different applications of the prior art and a further embodiment FIG. 2 , But also should be documented that the transverse bending at the bottom or top, or the bulge of the Einlaufheizplatte 16 at the front end of the inlet region I, in the middle of the inlet region between the Inlet areas I and II or towards the end of the inlet area II can be realized. Other conceivable varieties are of course possible. The Einlaufheizplatten 16 and the pressing / heating plates 19 of the main pressing portion III are mounted in a press frame 35 and are set with usually arranged therein adjusting devices in their position and their orientation. The pressed material mat 7 cured by means of pressure and heat and output after a calibration area towards the end of the main pressing area III as a continuous plate strand and the further processing (distribution, cooling, stacking) supplied.

In FIG. 2 It is shown how with the help of a transfer belt 20 in the inlet region I, II the press belt mat 7 is transferred to the lower steel belt 3. For the passage of the circulating drums 10 circulating steel belts 2 and 3 by the continuously operating press 1 are between the Einlaufheizplatten 16, respectively the hinge plates 12, 13, in the inlet area and the press-heating plates 19 in the main press area III and the steel strips 2 and 3 Rolling bars 4 spaced by means of insertion gears 5 and parallel to each other in the inlet region and guided by the continuously operating press 1.

FIG. 2 shows another variant of an inlet region I, II of a continuously operating press 1, in which the upper Einlaufheizplatte 16 by a two-stage Einlaufkeilverdichter with two hinge plates 12, 13, with joints arranged 8, 9, is replaced. Preference is given to the mat contact point 17 of the pressed material mat 7 with the upper steel strip 2 the upper rolling rods 4 with low pressure between the upper steel strip 2 and the first hinge plate 12 clamped in an insertion zone. In the further course of the pressed material mat 7 passes through the first compression section I and is thereby slightly compacted or even clamped only flat.

When crossing the rolling rods 4 via the joint 8 in the second compression section II Abrollbleche 11 are mounted between the hinge plates 12, 13, which ensure a smooth running of the rolling rods 4, with almost any adjustable angularity of the hinge plates 12, 13 to each other by the joint 8 is enabled. To set different compression angles α between the hinge plates 12, 13 and the Pressgutmatte 7 the hinge plates 12, 13 are each associated with at least one plunger plate 6 of the press frame 35 fixed actuator 15 in the upper region of the two-stage Einlaufkeilverdichters. After the second compression section II, the pressed material mat 7 enters the main pressing region III and is there compacted to the predetermined final thickness to a material plate and cured. Here, too, in the region of the second joint 9, rolling-off plates 11 are offset by differently set angles α between the second hinge plate 13 and the pressing / heating plates 19 in the main pressing region III for the passing rolling rods 4.

In the particularly preferred embodiment according to FIG. 2 Now, the lower Einlaufheizplatte 16 is bent or bulged with the central actuators 23 and there is a bulge 34, the partial or can be present over the entire width of the Einlaufheizplatte 16. The opposite inlet heating plate 16 (according to FIG. 1 ) or the inlet joint system (according to FIG. 2 ) remain linear (parallel to the rolling rods 4) set, the hinge plates 12, 13 preferably remain flat in their nature or can be readjusted and the Einlaufheizplatten 16 bent in their longitudinal extent to enhance the compression respectively to reduce the height of the inlet gap E accordingly be set and only transverse to the direction of production a linear adjustment parallel to the rolling rods 4. The reduction of the inlet gap E takes place with the joint plates 12, 13 thereby stepwise, so that in general results in sections planar surfaces in the direction of the rolling rods.

It is understandable that the procedure according to the teachings of the invention also works in the opposite case and above a transverse bending is set and the lower inlet plates 16 and the downwardly disposed inlet hinge system having at least two hinge plates 12, 13 substantially no transverse bending and parallel to the rolling rods 4 are aligned linearly.

Preferably, with the method according to the invention, the surface side 33 of the pressed material mat 7 lying in the direction of the curved or curved recess 34 is concavely deformed at least in parts transversely to the production direction 22 during the clamping and / or the compression. Accordingly, be on the opposite side the Pressgutmatte essentially flat hinge plates 12 and / or 13 used and / or the hinge plates 12 and / or 13 set substantially flat. Preferably, the entrapment of the pressed material mat 7 is performed almost without pressure at least in parts of the inlet region I, II, which applies in particular to parts or the entire inlet region I. It is an advantage and a preferred application if the inlet heating plate 16 is used bent substantially in the region of the mat contact point 17 and / or in the first inlet region I and / or in the second inlet region II transversely to the production direction or is correspondingly actively bent. A bulge 34 caused by the bending of the inlet heating plate 16, the pressed material mat 7 vents substantially in the direction of the narrow sides 30 of the pressed material mat 7. Particularly preferred is the application at a production speed in the production direction 22 of over 1.2 m / s and / or at a Pressgutmatten 7 a height h less than 35 mm. In this case, in another possible embodiment, the bending of the Einlaufheizplatte 16 transversely to the production direction 22 at the latest after 0.3 to 2 m after bilateral contact of the Pressgutmatte 7 at the mat contact point 17 with the steel strips 2, 3 is realized.

For better clarity are in the FIGS. 3 and 4 possible bending profiles 32 of the lower Einlaufheizplatte 16 shown. With LML while the longitudinal center line is shown, which is actually in the production direction 22 in the plane of the Pressgutmatte 7 and this divides the middle in two halves.

Preferably, in the region of the longitudinal center line LML with a larger force, for example by adjusting devices 23, the inlet heating plate 16 is bent and retained on the edge sides with suitable retraction means 29. Accordingly, sketchy force arrows can be found below the inlet heating plate 16, which should represent this situation. Of course, the bending of the Einlaufheizplatte 16 may also be static or stationary, as will be shown later. In the case of several rows of adjusting devices 23 in the production direction or in the longitudinal extent of the press, at least one adjusting device 23 or a row 31 can bring about bending on adjusting devices 23 in the direction of production.

Depending on the need for multiple actuators 23 across the width that also applies to the adjacent rows 31 'of the actuators 23rd

The air flows show the venting of the press material mat 7, which has been introduced in an advantageous manner, by means of the initiated air flows 21 in the direction of the narrow sides 30. During FIG. 3 represents a bending over the entire width of the Einlaufheizplatte 16 is in FIG. 4 only one bulge 34 shown. Here is additionally a comparison of the inlet column E and E 'shown. With a pure entrapment of the pressed material mat 7 in the inlet gap E, densification already takes place in the regions of the inlet gap E '.

The FIG. 5 shows by way of example the arrangement of a bulge 34 or a bend in the inlet regions I and / or II.

To FIG. 6 a Einlaufheizplatte 16 is used, which is at least at one point non-positively and / or positively fixed to at least a portion of the press frame 35. In the present embodiment, retaining means 14 are arranged on the edge sides of the inlet heating plate 16, which fix the inlet plate 16 at the edge of the pressure insulation 18 respectively the table plate 24 of the press frame 35. In the area of the longitudinal center line LML, a base 36 is now introduced, which ensures a static bulging of the lower inlet heating plate 16.

FIG. 7 also shows a section in the production direction with a front view of a press frame 35 with representation of possible actuators 23 for active support and / or transverse bending a lower Einlaufheizplatte 16 transverse to the production direction 22. A press frame 35 in a simplified representation can from a closed window frame plate (not shown) or from a composite window frame, which consists of a top-mounted ram plate 6, a bottom arranged table plate 24 and this connecting pull tabs 25. At a suitable location, here between the pull tabs 25 and the upper plunger plate 6 and between the plunger plate 6 and the table plate 24 actuators 26 and 27 are arranged, which are designed here as a single-acting hydraulic cylinder and are arranged opposite to each other in the load flow. As a result, via the adjusting device 26, the inlet heating plates 16 together and over the Actuators 27 are moved apart. It can also be seen in detail that the lower inlet heating plate 16 is arranged at the edge on a stop 28 and is fixed to the table plate 24 by means of the retraction means 29. The retraction means 29 can be permanently adjustable tie rods or active adjustable adjusting devices.

For better clarity is with FIG. 8 a partial perspective view of a lower part of the press frame 35, a plurality of table sheets 24 showing the pressure insulation 18 and a possible arrangement of the actuators 23 in rows 31 and 31 'shown below a lower Einlaufheizplatte 16. To set a preferred bending profile 32 after FIG. 5 now at least one hydraulic actuator 23 is activated in series 31 and bends the Einlaufheizplatte 16 in the region of the longitudinal center line LML in the direction of the overhead second Einlaufheizplatte. Already this setting of the inlet heating plate 16 below is sufficient to establish or optimize an air flow 21 in the direction of the narrow sides 30 of the pressed material mat 7 during the compression in the inlet region. Preferably, a plurality of adjusting devices 23 are successively activated in a row 31 in order to set a bending profile 32 as uniformly as possible or steadily increasing in the production direction. The rows 31 'can be supporting, or as after FIG. 4 contribute no part to the bending profile 32, resulting in a lower curvature of the entire Einlaufheizplatte 6 across the width, but possibly to a strong curvature of the Inlet heating plate leads in the direction of the longitudinal center line. The retraction means 29 ensure during an activation of the actuators 23 in the row 31, optionally with a support by the actuators 23 in the rows 31 'an optimal investment of the outer sides of the Einlaufheizplatte 16 at the stops 28th

After the FIGS. 9 to 11 An inlet heating plate can also be mounted floating on a plurality of hydraulic adjusting devices 23. In this case, for an at least proportional bending and / or bulge 34 at least in one part of a row 31 of the adjusting devices 23 in the production direction 22 hydraulic adjusting devices 23 are arranged with a larger maximum stroke than in the row 31 '.

In FIG. 9 is to illustrate this possibility, the Einlaufheizplatte 16 during idle, or idle, the continuous working press 1 and the Einlaufheizplatte 16 is lowered and the pistons of the actuators 23 are located at bottom dead center.

In FIG. 10 is the continuous press in the manufacturing plant for material plates and the two outer piston series 31 ', are at top dead center and have raised the Einlaufheizplatte 16 in the operating position. The actuator 23 of the row 31 is not yet reached the top dead center, since this actuator 23 of the row 31 with respect to the other actuators 23 of the rows 31 'has an extended stroke. The current hub can move away and / or pressure adjustment is performed and ensures a normal setting of the inlet heating 16. If now desired for the inventive method buckling, after FIG. 11 the central actuator 23 of the row 31 is acted upon by the necessary pressure, so that the piston reaches top dead center. At the same time the Einlaufheizplatte 16 is bent. It is understandable that either enough product back pressure of the pressed material mat 7 must be present for this bending or, if there is no product backpressure, for example in the case of pure entrapment or slight compression in the inlet region, the pistons of the outer adjusting devices 23 in the rows 31 'are firmly connected to the inlet heating plate 16 and the cylinders are connected to the press frame 35 and the table top 24, respectively. Of course, a rotated arrangement of the actuators 23 by 180 ° is conceivable or even useful.

It should again be emphasized that the rows 31, 31 'may not be limited. On the one hand, additional rows 31 'across the width of the continuously operating press 1 are conceivable; on the other hand, a plurality of adjusting devices 23 need not necessarily be activated for bending or bulging 34, but only one in a row may suffice for the necessary result to reach.

The continuous press can be used alone, but is also particularly suitable for carrying out the method.

LIST OF REFERENCE NUMBERS

1.

Kont. Working press

Second

Steel band above

Third

Steel band below

4th

roll bars

5th

introduction gear

6th

ram plate

7th

press material mat

8th.

Joint 1

9th

Joint 2

10th

Umlenktrommel

11th

Abrollbleche

12th

Joint plate to I

13th

Joint plate to II

14th

holding means

15th

hydraulic actuators

16th

Inlet heating plate below

17th

Matt contact point

18th

pressure isolation

19th

Press / heating plates to III

20th

Transfer belt

21st

airflow

22nd

production direction

23rd

locking device

24th

table sheet

25th

pull tabs

26th

locking device

27th

locking device

28th

attack

29th

return means

30th

narrow side

31st

Row adjusting device

32nd

bending profile

33rd

surface side

34th

upheaval

35th

press frame

36th

document

I

intake area

II

intake area

III

Main press area

e

going nip

H

Height of the pressed material mat 7

Claims (15)

1. A method for producing material panels in a continuously operating press (1), in which a pressed material mat (7) is subjected in the production direction (22) to clamping and/or compression in an inlet region before a main pressing region by steel belts (2, 3) guided around deflection rollers (10) and supported via roller bars (4), wherein inlet heating plates (16) and/or hinge plates (12, 13) are adjustable and/or bendable in the inlet region with respect to their distance from each other for setting the geometry of the inlet gap (E) in the production direction, characterized in that during the passage through the inlet region (I, II) the pressed material mat (7), in at least one section in the production direction (22), is clamped and/or compressed from one surface side (33) by an inlet heating plate (16) which is substantially linear transversely to the production direction (22) or at least by two hinge plates (12, 13) which are substantially linear transversely to the production direction (22), and from the opposite surface side (33) by an inlet heat plate (16) which is bent at least in the region of the longitudinal center line (LML) in the direction of the pressed material mat (7) transversely to the production direction.
2. A method according to claim 1, characterized in that the surface side (33) of the pressed material mat (7), which is situated in the direction of the inlet heating plate (16) which is bent or comprises a bulging (34), is deformed in a concave manner during clamping and/or compression at least in part transversely to the production direction (22).
3. A method according to claim 1 or 2, characterized in that substantially flat hinge plates (12 and/or 13) are used, and/or the hinge plates (12 and/or 13) are set in a substantially flat way.
4. A method according to one or several of the preceding claims, characterized in that the clamping of the pressed material mat (7) is performed in a virtually unpressurised manner in parts of the inlet region (I, II).
5. A method according to one or several of the preceding claims, characterized in that the inlet heating plate (16) is used in a bent manner or is bent in a respectively active manner substantially in the region of the mat contact point (17) and/or in the first inlet region (I) and/or in the second inlet region (II) transversely to the production direction.
6. A method according to one or several of the preceding claims, characterized in that as a result of the bulging (34) produced by bending of the inlet heating plate (16) the pressed material mat (7) is vented substantially against the production direction (22) and/or in the direction of the narrow sides (30) of the pressed material mat (7).
7. A method according to one or several of the preceding claims, characterized in that by bending the inlet heating plates (16) the pressed material mat (7) is vented substantially in the direction of the narrow sides (30) of the pressed material mat (7).
8. A method according to one or several of the preceding claims, characterized by an application at a production speed in the production direction (22) of more than 1.2 m/s.
9. A method according to one or several of the preceding claims, characterized by an application in pressed material mats (7) of a height (h) of less than 35 mm.
10. A method according to one or several of the preceding claims, characterized in that the bending of the inlet heating plate (16) transversely to the production direction (22) is realized at the latest after 0.3 to 2 m after contact on both sides of the pressed material mat (7) at the mat contact point (17) with the steel belts (2, 3).
11. A method according to one or several of the preceding claims 1 to 10, characterized in that an inlet heating plate (16) is used which is fixed at least at one point in a frictionally engaged and/or interlocking manner to at least one press frame (35) and is statically bent with a respectively inserted base (36).
12. A method according to one or several of the preceding claims 1 to 10, characterized in that in the case of a floating bearing of an inlet heating plate (16) on several hydraulic actuating apparatuses (23) a greater stroke and/or a greater pressure is set in the production direction against the other actuating apparatuses (31') at least proportionately and at least in parts of a row of the actuating apparatuses (31), and wherein the inlet heating plate (16) is pulled back in the direction of the press frame (35) by withdrawal means (29) against the stops (28) which are arranged between a portion of the press frame (35) and the inlet heating plate (16).
13. A method according to one or several of the preceding claims 1 to 10, characterized in that in the case of a floating bearing or retaining of an inlet heating plate (16) on several hydraulic actuating apparatuses (23), which are held during operation in the maximally extended position, the hydraulic actuating apparatuses (23) have a greater maximum stroke against the other actuating apparatuses (31') and are set during the bending of the inlet heating plate (16) to the maximum stroke at least proportionately and at least in parts of a row of the actuating apparatuses (31) in the production direction.
14. A continuously operating press for producing material panels, in which steel belts (2, 3) are arranged which are guided in the production direction (22) by deflection rollers (10) and are supported via roller bars (4), wherein inlet heating plates (16) and/or hinge plates (12, 13) for setting the geometry of the inlet gap (E) in the production direction are adjustable in their distance with respect to each other and/or are arranged in a bending manner in the inlet region for clamping and/or compression in an inlet region before a main pressing region (III), wherein the continuously operating press, especially for performing the method, is characterized in that an inlet heating plate (16) is arranged in the inlet region,

    14.1 which for bending and/or bulging is fixed at least at one point in a frictionally engaged and/or interlocking manner to at least one part of the press frame (35), and is arranged in a statically bent manner by a respective base (36),
    and/or

    14.2 several hydraulic actuating apparatuses (23) are arranged for bearing, and actuating apparatuses (23) are arranged for the at least proportional bending and/or bulging of the inlet heating plate (16) at least in parts of a row (31) in the production direction (22) with a greater adjustable stroke and/or a greater adjustable pressure in relation to the other actuating apparatuses (23) of the row (31'), and wherein for withdrawing the inlet heating plate (16) in the direction of the press frame (35) withdrawal means (29) with stops (28) are arranged between a portion of the press frame (35) and the inlet heating plate (16), and/or

    14.3 several hydraulic actuating apparatuses (23) are arranged for floating bearing, and hydraulic actuating apparatuses (23) with a greater maximum stroke are arranged for the at least proportional bending and/or bulging at least in a part of a row (31) of the actuating apparatuses (23) in the production direction (22) than in the adjacent row (31').
15. A continuously operating press according to claim 14, characterized in that the inlet heating plate (16) has a predetermined radius on the side of the roller bars (4).

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