DE102009015893A1 - Process for producing material plates in a continuous press and a continuously operating press - Google Patents

Abstract

The invention relates to a method for the production of material plates in a continuously operating press (1), in which in the production direction (22) guided by deflection drums (10) and roll bars (4) supported steel belts (2, 3) a Pressgutmatte (7). an entrapment and / or a compression in an inlet region before a main pressing region is subjected, wherein in the inlet region Einlaufheizplatten (16) and / or joint plates (12, 13) for adjusting the geometry of the inlet gap (E) in the production direction in their distance adjustable and / / or bendable. The invention consists in that, during the passage through the inlet region (I, II), the pressed material mat (7) from at least one section (22) in the production direction (22) has a substantially linear inlet heating plate (33) from a surface side (33). 16) or at least with two transversely to the production direction (22) substantially linear hinge plates (12, 13) and from the opposite surface side (33) with an 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 ( 22) bent Einlaufheizplatte (16) is clamped and / or compressed. Further, the invention relates to a continuously operating press.

Description

The The invention relates to a method for producing material plates in a continuous press according to the preamble of claim 1 and on a continuous press to carry 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, since the quality of the pressed food mat created is an important factor in addition to the quality of the raw materials.

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 continuously operating 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 region bendable Einlaufheizplatten that can be adjusted by means of hydraulic actuating means 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 C1 ).

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. In this case, the transitions from the first pressing step to the second pressing step and from the second pressing step to the main pressing region can be set to be convex or concave. 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 smaller than 16 mm require a short residence time in the continuous 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.

The Experience has shown that the inlet wedge compressor and previous Compaction or manufacturing process according to the state described above the technology 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 Pressgutmatte, the only partially vented by pre-pressing can be because the Pressgutmatte after a pre-press tends to spring. To make matters worse, that in principle in the material plate production by low blowouts in the Topcoat dust swirls occur before the mat contact point, which lead to streaking of the surface can. Will have the highest possible production speed chosen, at the larger blowouts according to experience, not at all or only very rarely It can occur through the on the large surface sides exiting air flows to partially high flow velocities come, which is a shift of smaller cover layer areas arise and make themselves felt as microcracks in the top layer. Again, in addition to the wedge effect of microcracks, the problem arises a poor surface quality, in particular in the manufacture of thin plates.

Of the Invention is now the object of a method for compaction to create a pressed material mat in a continuous press, that is capable of an optimized ventilation of the pressed material mat allow in the inlet area against the production direction and at the same time a simpler setting of the inlet area allows. At the same time a continuous working Press to carry out the process to be created.

The Solving this task for the process consists in that during the passage through the inlet area at least in one section in the production direction the pressed material mat from a surface side with a direction transverse to the production direction essentially linear Einlaufheizplatte or at least two transverse to the direction of production substantially linear hinge plates and from the opposite surface side with one at least in the region of the longitudinal center line in Direction of the pressed material mat bent transversely to the production direction Einlaufheizplatte is trapped and / or compressed.

• 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
• 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
• 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,

• 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
• B) are arranged for the storage for several hydraulic actuators and for at least proportional bending and / or buckling of the Einlaufheizplatte at least parts of a series of actuators in the production direction with a larger adjustable stroke and / or a greater adjustable pressure compared to the other actuators of the series are arranged 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
• 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.

Next a combination of all three different system features the features A) to C) also each independently and alone be arranged to bend the Einlaufheizplatte.

With the solution according to the invention for the method and for the continuously operating Pres se, which, moreover, can also be operated separately from the method independently according to the teaching, there are the following advantages in the production of material plates from pressed material mats 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 is selectively bent so that compared to the narrow sides of the Pressgutmatte in the middle 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.

• a) es wird eine schonende und optimierte Entlüftung in der ersten Verdichtungszone über die Schmalflächen der Pressgutmatte erreicht,
• b) Ausbläser in den oberen Deckschichten der Pressgutmatte werden vermieden,
• c) Staubverwirbelungen über den Deckschichten der Pressgutmatte direkt vor dem Mattenkontaktpunkt treten nicht auf, somit ergibt sich eine optimale und gleichmäßige Oberflächenstruktur und -färbung,
• 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
• e) die Brandgefahr durch Staubaufwirbelungen ist im Einlauf erheblich reduziert.

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

• a) a gentle and optimized venting is achieved in the first compression zone over the narrow surfaces of the pressed material mat,
• b) Blowers in the upper cover layers of the pressed material mat are avoided
• 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,
• 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
• e) the risk of fire due to the raising of dust is considerably reduced in the inlet.

simultaneously can work in the newly created continuously Press for carrying out the invention Process also continues to be thick material plates of very high Pressed material mats are made over 75 mm height, without a loss of quality over the previous ones Manufacturing plants to accept. Accordingly applies that the newly created continuous press also independently without the invention Procedure can be operated successfully, taking the characteristic Features.

Regarding The press technology has been the practice for more than a decade the inlet plates or the hinge plates in the inlet region in the longitudinal direction respectively in the direction of production to adjust or bend. This is to achieve optimum ventilation. By the way stands with the many different procedures and the different Pressure and compression parameters in the foreground, for example in targeted steam injection techniques with relatively moist pressed material mats, different Compaction profiles for setting the cover layer densities opposite the middle class density and much more.

It It has been shown that the well-known teaching of the prior art with regard to the bending of the inlet plates or hinge plates on keywords such as "wedge-shaped", "trumpet-shaped" or "cone-shaped" inlet area limited. The lesson behind the last terms and the state of the art was the narrow sides of the pressed material mat to condense more to blowouts from the narrow sides to avoid, but in turn reinforced to blowouts on the surface sides through the opposite direction of production to be performed vent with the described Dangers for the steel strips ground to have. In such inlet profiles, the inlet or the Joint plates predominantly in the longitudinal and transverse direction bent. The disadvantage here is especially the Multiaxialverbiegung but quite rigid metal plates, which is neither easy to handle, still easily executable.

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 does not contradict the possibility to adjust an inlet profile in the longitudinal direction by the inlet plates are bent in the longitudinal direction for adjusting the height of the inlet gap, as in a longitudinal deflection, for example, kurvi is set profile, in the transverse direction but a linear, parallel to the rolling rods, line is to 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 The invention will be apparent from the subclaims and the following Description with the drawing out.

It demonstrate:

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

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,

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,

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

5 a schematic representation of a stepped inlet wedge compressor after 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,

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

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,

8th 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,

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

10 the inlet heating plate after 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

11 the inlet heating plate after 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 1 to illustrate the manufacturing process, especially in conjunction with 2 sufficient. In 1 schematically shows the overall structure of the continuous press 1 shown in a basic structure each two endless circulating steel belts 2 and 3 has, which around idler pulleys 10 are guided. A pressed material mat 7 will be in the inlet area I / II introduced, which in the prior art usually on a forming belt (not shown) by means of a scattering machine (not shown) scattered and possibly after a pre-compression by means of a pre-press (not shown) is compressed. In the embodiment according to 1 are top and bottom inlet hotplates 16 arranged, as already described for adjusting the usually mentioned inlet wedge compressor (wedge shape, basically means the top and bottom not bent in the transverse direction but only set in the longitudinal direction or bent Einlaufheizplatten 16 ) serve. The subdivision of the inlet area into a first and second inlet area I . II is based on different applications of the prior art and a further embodiment according to 2 , But also it should be documented with who that the transverse bending at the bottom or top, or the bulge of the Einlaufheizplatte 16 at the front end of the inlet area I , in the middle of the inlet area 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 inlet heating plates 16 and the press / heating plates 19 of the main press area III are in a press frame 35 stored and are adjusted with usually arranged adjusting devices in their position and orientation. The pressed material mat 7 cured by pressure and heat and after a calibration area towards the end of the main pressing area III issued as a continuous strand of plate and the further processing (distribution, cooling, stacking) supplied.

In 2 is shown as using a transfer belt 20 in the inlet area I . II the lower steel band 3 the pressed material mat 7 is handed over. For the passage of the deflection drums 10 circumferential steel bands 2 and 3 through the continuous press 1 be between the inlet hotplates 16 , respectively the hinge plates 12 . 13 , in the inlet area or the press heating plates 19 in the main press area III and the steel bands 2 and 3 roll bars 4 by means of introduction gears 5 spaced and parallel to each other in the inlet region and through the continuously operating press 1 guided.

2 shows another variant of an inlet area I . II a continuously working press 1 in which the upper Einlaufheizplatte 16 through a two-stage inlet wedge compressor with two joint plates 12 . 13 , with joints arranged on it 8th . 9 , is replaced. Preference is given to the mat contact point 17 the pressed material mat 7 with the upper steel band 2 the upper roll bars 4 with low pressure between the upper steel band 2 and the first hinge plate 12 trapped in an induction zone. In the further course, the pressed material mat passes through 7 the first compression section I and is thereby slightly compacted or even clamped flat. When crossing the roll bars 4 over the joint 8th in the second compression section II are roll-off sheets 11 between the hinge plates 12 . 13 appropriate for a smooth running of the rolling rods 4 take care, with almost every adjustable angularity of the hinge plates 12 . 13 to each other through the joint 8th is possible. To set different compression angles α between the hinge plates 12 . 13 and the pressed material mat 7 are in the upper part of the two-stage inlet wedge compressor the joint plates 12 . 13 one at least on a plunger plate 6 of the press frame 35 fixed actuator 15 assigned. After the second compression section II the pressed material mat runs 7 in the main press area III and is there compacted to the predetermined final thickness to a material plate and cured. Again, there are in the area of the second joint 9 Abrollbleche 11 by differently set angle α between the second hinge plate 13 and the press / heating plates 19 in the main press area III for the passing bars 4 compensate.

In the particularly preferred embodiment according to 2 now becomes the lower inlet heating plate 16 with the central adjusting devices 23 bent or bulging and it raises a bulge 34 one, the partially or over the entire width of the Einlaufheizplatte 16 can be present. The opposite inlet heating plate 16 (to 1 ) or the inlet joint system (according to 2 ) stay linear (parallel to the roll bars) 4 ), wherein the hinge plates 12 . 13 preferably remain flat or can be adjusted in their nature and the Einlaufheizplatten 16 be bent in their longitudinal extent to enhance the compression respectively to reduce the height of the inlet gap E and only transversely to the direction of production a linear adjustment parallel to the rolling rods 4 is set. The reduction of the inlet gap E takes place with the hinge plates 12 . 13 this stepwise, so that in sections usually planar surfaces result in the direction of the rolling rods.

It is understood 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 respectively arranged below inlet system with at least two hinge plates 12 . 13 have substantially no transverse bending and parallel to the rolling rods 4 are aligned linearly.

Preferably, with the method according to the invention in the direction of the curved or a bulge 34 having Einlaufheizplatte 16 lying surface side 33 the pressed material mat 7 during the entrapment and / or the compression at least in parts transversely to the production direction 22 concave deformed. Accordingly, on the opposite side of the pressed material mat substantially flat hinge plates 12 and or 13 used and / or the hinge plates 12 and or 13 basically adjusted. Preferably, the entrapment of Pressgutmatte 7 at least in parts of the inlet area I . II performed almost depressurized, which is especially for parts or the entire inlet area I applies. It is advantageous and a preferred application when the Einlaufheizplatte 16 essentially in the area of the mat contact point 17 and / or in the first inlet area I and / or in the second inlet area II is bent transversely to the direction of production is used or bent accordingly active. One by the bending of the inlet heating plate 16 ent standing bulge 34 the pressed material mat 7 vented substantially in the direction of the narrow sides 30 the pressed material mat 7 , Particularly preferred is the application at a production speed in the production direction 22 of more than 1.2 m / s and / or one of pressed material mats 7 a height h less than 35 mm. It should be in another possible embodiment, the bending of the inlet heating 16 across the production line 22 at the latest after 0.3 to 2 m after bilateral contact of the pressed material mat 7 at the mat contact point 17 with the steel bands 2 . 3 is realized.

For better clarity are in the 3 and 4 possible bending profiles 32 the lower inlet heating plate 16 shown. With LML, the longitudinal center line is shown, which is actually in the production direction 22 in the plane of the pressed material mat 7 lies and divides it in half in the middle.

Preferably, in the region of the longitudinal center line LML with a greater force, for example by adjusting devices 23 , the inlet hotplate 16 bent and on the edge sides with suitable retraction agents 29 retained. Accordingly, sketchy force arrows can be found below the inlet heating plate 16 which are intended to represent this situation. Of course, the bending of the Einlaufheizplatte 16 also be static or stationary, as will be shown later. For 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 on adjusting devices 23 produce a deflection in the direction of production. As needed, or more actuators 23 across the width, this also applies to the adjacent rows 31 ' the adjusting devices 23 or more rows. The air flows show the venting of the pressed material mat which has been introduced in an advantageous manner 7 by means of the initiated air currents 21 in the direction of the narrow sides 30 , While 3 a deflection over the entire width of the inlet heating plate 16 represents is in 4 just a bulge 34 shown. Here is additionally a comparison of the inlet column E and E 'shown. In a pure entrapment of Pressgutmatte 7 In the inlet gap E is already in the areas of the inlet gap E 'instead of a compression. In a compression of the pressed material mat with an inlet gap E and a bulge The 5 shows an example of the arrangement of a bulge 34 or a bend in the inlet areas I and or II ,

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

7 also shows a section in the production direction with a front view of a press frame 35 with representation of possible adjusting devices 23 for active mounting and / or transverse bending of a lower inlet heating plate 16 across the production line 22 , A press frame 35 in a simplified representation can from a closed window frame plate (not shown) or a composite window frame, which consists of a top-mounted ram plate 6 , a table top arranged below 24 and these connecting pull tabs 25 consists. At a suitable place, here between the pull tabs 25 and the upper ram plate 6 and between the plunger plate 6 and the table top 24 are adjusting devices 26 and 27 arranged, which are designed here as a single-acting hydraulic cylinder and are arranged opposite to each other in the load flow. This allows the adjusting device 26 the inlet heating plates 16 together and over the adjusting devices 27 be driven apart. In detail, it can be seen further that the lower Einlaufheizplatte 16 on the edge on a stop 28 is arranged and by means of the withdrawal means 29 to the table-top 24 is fixed. The retreat 29 can be permanently adjustable tie rods or active adjustable adjusting devices.

For better clarity is with 8th a partial perspective view of a lower part of the press frame 35 , several table plates 24 with representation of the pressure insulation 18 and a possible arrangement of the adjusting devices 23 in rows 31 and 31 ' below a lower inlet heating plate 16 shown. For setting a preferred bending profile 32 to 5 Now at least one hydraulic actuator 23 in row 31 activates and bends the inlet heating plate 16 in the area of the longitudinal center line LML in the direction of the upper second inlet heating plate. Already this setting of the inlet hotplate 16 below is enough to make a flow of air 21 in the direction of the narrow sides 30 the pressed material mat 7 during compaction in the inlet area to establish or optimize. Preference is given to several adjusting devices 23 one after another in a row 31 activated to a bending profile 32 set as evenly or steadily increasing in the direction of production. The rows 31 ' can act as supportive or as after 4 no part to the bending profile 32 contribute, 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 retreat 29 ensure during activation of the actuators 23 in line 31 , if necessary with support from the actuators 23 in the rows 31 ' optimal installation of the outer sides of the inlet heating plate 16 at the attacks 28 ,

After the 9 to 11 An inlet hotplate can also float on several hydraulic actuators 23 be stored. This is for an at least proportional bending and / or buckling 34 at least in part of a series 31 the adjusting devices 23 in production direction 22 hydraulic actuators 23 are arranged with a larger maximum stroke than in the series 31 ' ,

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

In 10 The continuous press is located in the manufacturing plant for material plates and the two outer pistons of the series 31 ' , are located at top dead center and have the Einlaufheizplatte 16 raised in operating position. The adjusting device 23 the series 31 is not yet reached the top dead center, since this actuator 23 the series 31 opposite to the other adjusting devices 23 of the ranks 31 ' has an extended stroke. The current stroke can be carried out weg- and / or pressure-controlled and ensures a normal setting of the inlet heating 16 , If a curvature is desired for the method according to the invention, it is after 11 the middle actuator 23 the series 31 subjected to the necessary pressure, so that the piston reaches top dead center. At the same time the Einlaufheizplatte 16 bent. It is understandable that either enough product back pressure of the pressed material mat for this bending 7 must be present or in the absence of product back pressure, for example, in a pure entrapment or slight compression in the inlet region, the piston of the outer adjusting devices 23 in the rows 31 ' firmly with the inlet heating plate 16 must be connected and the cylinder with the press frame 35 or the tabletop 24 are connected. Of course, a rotated arrangement of the adjusting devices 23 by 180 ° conceivable or even meaningful.

Let's emphasize that the ranks 31 . 31 ' not be limited. First, there are additional rows 31 ' across the width of the continuous press 1 conceivable, for another, need for a bend or a bulge 34 not necessarily several adjusting devices 23 can be activated, but only one in a row can be enough to achieve the necessary result.

1

Cont. working press

2

steel strip above

3

steel strip below

4

roll bars

5

introduction gear

6

ram plate

7

press material mat

8th

joint 1

9

joint 2

10

Umlenktrommel

11

Abrollbleche

12

Hinge plate plate too I

13

Hinge plate too II

14

holding means

15

hydraulic actuators

16

Einlaufheizplatte below

17

Matt contact point

18

pressure isolation

19

Press / heating plates too III

20

Transfer belt

21

airflow

22

production direction

23

locking device

24

table sheet

25

pull tabs

26

locking device

27

locking device

28

attack

29

return means

30

narrow side

31

line locking device

32

bending profile

33

surface side

34

upheaval

35

press frame

36

document

I

intake area

II

intake area

III

Main press area

e

inlet gap

H

Height of the pressed material mat 7

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

• - DE 3913991 C2 [0003]
• - DE 3413397 [0004]
• - DE 19824723 C1 [0004]
• - DE 4301594 C2 [0005]
• - DE 10045681 A1 [0005]

Cited non-patent literature

• - "Wood materials, production and processing" by Hansgert Soiné, DRW-Verlag 1995, pages 17ff [0002]

Claims (15)

Process for producing material plates in a continuous press ( 1 ), in the direction of production ( 22 ) by deflecting drums ( 10 ) guided and over rolling bars ( 4 ) supported steel belts ( 2 . 3 ) a pressed material mat ( 7 ) is subjected to an entrapment and / or a compression in an inlet region in front of a main pressing region, wherein in the inlet region inlet heating plates ( 16 ) and / or joint plates ( 12 . 13 ) for adjusting the geometry of the inlet gap (E) in the production direction in their distance from one another are adjustable and / or bendable, characterized in that during the passage through the inlet region ( I . II ) at least in a section in the production direction ( 22 ) the pressed material mat ( 7 ) from a surface side ( 33 ) with a direction transverse to the production direction ( 22 ) substantially linear inlet heating plate ( 16 ) or at least two transverse to the direction of production ( 22 ) substantially linear hinge plates ( 12 . 13 ) and from the opposite surface side ( 33 ) with at least in the region of the longitudinal center line (LML) in the direction of the pressed material mat ( 7 ) across the production direction ( 22 ) curved inlet heating plate ( 16 ) is clamped and / or compressed. A method according to claim 1, characterized in that in the direction of the curved or a bulge ( 34 ) having inlet heating plate ( 16 ) surface side ( 33 ) of the pressed material mat ( 7 ) during the entrapment and / or the compression at least in parts transversely to the production direction ( 22 ) is deformed concave. A method according to claim 1 or 2, characterized in that substantially flat hinge plates ( 12 and or 13 ) and / or the hinge plates ( 12 and or 13 ) are set substantially flat. Method according to one or more of the preceding claims, characterized in that the entrapment of the pressed material mat ( 7 ) at least in parts of the inlet area ( I . II ) is carried out almost without pressure. Method according to one or more of the preceding claims, characterized in that the inlet heating plate ( 16 ) substantially in the region of the mat contact point ( 17 ) and / or in the first inlet area ( I ) and / or in the second inlet area ( II ) is used bent transversely to the production direction or is actively bent accordingly. Method according to one or more of the preceding claims, characterized in that by the bending of the inlet heating plate ( 16 ) bulge ( 34 ) the pressed material mat ( 7 ) substantially against the production direction ( 22 ) and / or in the direction of the narrow sides ( 30 ) of the pressed material mat ( 7 ) is vented. Method according to one or more of the preceding claims, characterized in that by the bending of the inlet heating plate ( 16 ) the pressed material mat ( 7 ) substantially in the direction of the narrow sides ( 30 ) of the pressed material mat ( 7 ) is vented. Method according to one or more of the preceding claims, characterized by an application at a production speed in the production direction ( 22 ) of more than 1.2 m / s. Method according to one or more of the preceding claims characterized by an application in pressed material mats ( 7 ) of a height (h) less than 35 mm. Method according to one or more of the preceding claims, characterized in that the bending of the inlet heating plate ( 16 ) across the production direction ( 22 ) at the latest after 0.3 to 2 m after bilateral contact of the pressed material mat ( 7 ) at the mat contact point ( 17 ) with the steel bands ( 2 . 3 ) is realized. Method according to one or more of the preceding claims 1 to 10, characterized in that an inlet heating plate ( 16 ) is used, at least at one point non-positively and / or positively on at least one press frame ( 35 ) is fixed and with a correspondingly inserted pad ( 36 ) is bent statically. Method according to one or more of the preceding claims 1 to 10, characterized in that in the case of a floating mounting of an inlet heating plate ( 16 ) on several hydraulic actuators ( 23 ) at least partially and at least in part of a series of the adjusting devices ( 31 ) in the direction of production a larger stroke and / or a greater pressure compared to the other actuating devices ( 31 ' ) and wherein the inlet heating plate ( 16 ) in the direction of the press frame ( 35 ) with withdrawal agent ( 29 ) against attacks ( 28 ) is withdrawn between a part of the press frame ( 35 ) and the inlet heating plate ( 16 ) are arranged. Method according to one or more of the preceding claims 1 to 10, characterized in that in the case of a floating storage or mounting of an inlet heating plate ( 16 ) on several hydraulic actuators ( 23 ), which are held in maximum extended position during operation, at least in part and at least in part of a series of adjusting devices ( 31 ) in the direction of production the hydraulic actuators ( 23 ) compared to the other actuating devices ( 31 ' ) have a larger maximum stroke and during the bending of the inlet heating plate ( 16 ) are set to the maximum stroke. Continuously working press for the production of material plates in the direction of production ( 22 ) by deflecting drums ( 10 ) guided and over rolling bars ( 4 ) supported steel belts ( 2 . 3 ), wherein for clamping and / or compression in an inlet region in front of a main pressing region ( III ) in the inlet area inlet heating plates ( 16 ) and / or joint plates ( 12 . 13 ) are arranged to adjust the geometry of the inlet gap (E) in the production direction in their distance adjustable and / or bendable, wherein the continuously operating press for performing the method is characterized in that a Einlaufheizplatte ( 16 ) is arranged in the inlet region, 14.1 for a bending and / or buckling at least at one point non-positively and / or positively on at least part of the press frame ( 35 ) and by an appropriate document ( 36 ) is arranged bent statically and / or 14.2 for the storage for several hydraulic actuators ( 23 ) are arranged and for the at least proportional bending and / or buckling of the inlet heating plate ( 16 ) at least in part of a series ( 31 ) Actuators ( 23 ) in the production direction ( 22 ) with a larger adjustable stroke and / or a greater adjustable pressure compared to the other actuating devices ( 23 ) the series ( 31 ' ) and wherein for the retraction of the inlet heating plate ( 16 ) in the direction of the press frame ( 35 ) Withdrawal means ( 29 ) with stops ( 28 ) between a part of the press frame ( 35 ) and the inlet heating plate ( 16 ) are arranged. and / or 14.3 for multiple hydraulic actuators for floating storage ( 23 ) and for the at least partial bending and / or buckling at least in one part of a row ( 31 ) of the adjusting devices ( 23 ) in the production direction ( 22 ) hydraulic actuators ( 23 ) are arranged with a larger maximum stroke than in the adjacent row ( 31 ' ). Continuously operating press according to claim 14, characterized in that the inlet heating plate ( 16 ) on side of the roll bars ( 4 ) has a given radius.