DE102005053920B4 - Method for adjusting an inlet wedge compressor of a continuous press in the course of the production of material plates and a continuous press for performing the method - Google Patents

Abstract

Method for adjusting an inlet wedge compressor of a continuous press in the course of the production of material plates, wherein a pressed onto a forming belt press material mat is pressed and cured in a continuous press between two endless rotating steel belts (3) using pressure and heat, wherein in the press inlet a Einlaufkeilverdichter for supporting the steel strips (3) top and bottom of heating plates (9, 10) with steel band side abutting Abrollplatten (11) is arranged, wherein in Einlaufkeilverdichter a Hauptverdichtungsprofil for Pressgutmatte with differentiated compression curves top and bottom for the steel bands (3) Hydraulic cylinder (5, 6) is einsteuerbar, characterized in that after Einsteuerung the Hauptverdichtungsprofiles for the respective end product in the inlet wedge compressor, if necessary 100-500 mm after bilateral contact of the steel bands (3) with the Pressgutmatte (1), the upper and / or the lower compression curve in a short range (B) is variable, wherein by means of the width arranged hydraulic double-acting Kurzhubzylinder (12) the Abrollplatte (11) in this short area (B) of the pressed material mat (1) pulled away or to Pressgutmatte (1) is pressed down and wherein this region (B) has a length of 200 to 400 mm.

Description

The invention relates to a method for setting an inlet wedge compressor of a continuously operating press in the course of the production of material plate according to the preamble of claim 1 and to a continuously operating press for performing the method according to the preamble of claim. 5

Particleboard and the production of material plates from, for example, medium-density fibers are now automated processes and are already being used in many countries for many years. As described in "Holzwerkstoffe, Herstellung und Verarbeitung" by Hansgert Soiné, DRW-Verlag 1995, pages 17ff, the pressing of processed chips or fibers takes place either in a clock-bound or continuous manner. 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.

For the large-scale production of wood-based panels, continuous presses are used. 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. Also in the DE 43 01 594 C2 Such a press is described, wherein in this disclosure a so-called inlet wedge compressor takes over the press material mat from a conveyor belt and strongly compacted according to a Hauptverdichtungsprofil by the upper steel strip in the inlet. The setting options of this inlet wedge compressor is the subject of this patent application, wherein the lower steel strip inlet is rigid and no further adjustment options more. 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.

The preparation of a pressed material mat, 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 are common in such production systems as metal detectors, pre-compression for pre-compression, Besäumungsvorrichtungen the long sides of the pressed material and finally a special transfer belt that introduces the pressed material mat at a predefined location in the inlet wedge compressor of the continuously operating press.

Typically, two compression strategies are used in the inlet of continuously operating presses, either a slow linear compression from Preßgutmattenkontakt is carried out to the final thickness of the material plate or a rapid compression after Pressgutmattenkontakt is carried out almost to the final thickness. The latter is usually used in continuous double belt press or calender presses.

In the case of thin plate production with a final thickness of less than 4 mm, fast feed rates (above 1000 mm / s) are generally used for thin pre-compacted pressed material mats (about 15 to 100 mm press mat height). The pressed material mats are compressed in the inlet wedge compressor for a length of 2 to 4 m to almost the final thickness. An extremely fast compaction can lead to blowouts or backflow of the pressed material which is not clamped over the whole area in calender presses or in poorly adjusted inlet wedge compressors of continuous double belt presses. Outbreaks are caused by the air escaping from the press material mat, contrary to the production direction, through the press material mat itself or over the edge areas when flow congestion occurs. The result is Pressgutmattendopplungen which can lead to local damage (imprints) on steel strip with their excessive density. The result is a recurring poor surface quality of the final product at this point of the steel strip.

In order to avoid blowouts, it must be possible to control the compression in the range of 100-500 mm after mat contact over a short distance of about 200 to 400 mm while maintaining the remaining compaction geometry. For this purpose, however, the known prior art is not able, since with adjustments of the upper and / or lower inlet geometry is always the two-sided mat contact point shifts, which in turn causes a variety of changes in the parameter flow of the compression and not to a fine adjustment of the compression profile in the first 1000 mm is suitable.

The invention is based on the object a method for fine adjustment of Specify Hauptverdichtungsprofiles the inlet wedge compressor a continuously operating press that allows during operation to change the compression curves above and / or below in a short area shortly after the mat contact and allows adjustment of Hauptverdichtungsprofiles without having to adjust the wedge in its entirety. At the same time a continuous press is to be created, which allows the implementation of this method.

The solution for the inventive method according to claim 1 is that after Einsteuerung the Hauptverdichtungsprofiles for the respective end product in the inlet wedge compressor, if necessary 100-500 mm after bilateral contact of the steel strips with the pressed material the upper and / or lower compression curve in a short range is variable, wherein by means of arranged over the width of the hydraulic double-acting short-stroke cylinder, the rolling plate is pulled away in this short area of the pressed material mat or pushed towards Pressgutmatte out and this region has a length of 200 to 400 mm.

This serves to enable the infeed wedge compressor to set a main compaction profile for the pressed material mat with differentiated compression curves at the top and bottom for the steel bands for coarse adjustment and that the fine adjustment of the main compaction profile takes place only in a range of 200 to 400 mm in length.

The solution for a plant for carrying out the method according to claim 5 is that in the inlet wedge compressor in a range of 100-500 mm after bilateral contact of the upper and lower steel belts with the pressed material over the width arranged hydraulic double-acting Kurzhubzylinder above and / or below are hinged to the rolling plates.

The advantages of the method according to the invention and the continuous double belt press are obvious. It can be controlled by means of small paths and pressures a wide range of main compression profiles. For just at the beginning of the inlet wedge compressor after mat contact arise no major opposing forces from the pressed material, so that compared to the main hydraulic cylinders in the main press area very precisely adjustable smaller hydraulic cylinder for fine adjustment of the lower and / or upper compression profile can be used. Due to the arrangement of these small hydraulic cylinders, it is not necessary to move the large hydraulic cylinders for adjustment, which pre-adjust the inlet wedge compressor at the top and bottom. When changing the coarse adjustment of the inlet wedge compressor top and bottom during production, ie under load, problems with the roll bar run and or during steel strip running can occur, which can have a serious impact. In order to save the continuous press, it is normally drained before the main parameters can be changed.

This is to avoid that at high production speeds problems occur in the compaction of Pressgutmatte in inlet wedge compressor. The feasible fine adjustment is advantageous in that it can be performed without a displacement of the mat contact.

In that regard, the solution of the object of the present invention also helps to facilitate a comparability of different inlet gradients, since the most important parameter "double-sided mat contact" is not changed.

In order to influence the compaction speed of the mat for the decisive and localized area of approx. 100-500 mm, the lower rolling plate is flexibly inserted and extended over a length of 200-400 mm into the pressed material mat. At this time, the specific back pressure of the pressed material mat is very low, sometimes less than 0.4 N / mm ² . This allows a lightweight design in terms of hydraulics and the cylinder used and you can still achieve a large deflection of the rolling plate of +/- 4 mm. This makes it possible to use a locally limited (a 500 mm distance) extremely high flexibility of about 8 mm in total in the inlet wedge compressor at an important point of the pressing material mat compression, in which a convex or concave deformation of the rolling plates can be set perpendicular to the pressed material mat. This can be particularly important in high-speed production of material plates of thickness up to 6 mm with feed rates over 1000 mm / s.

The advantages are that blowouts or dust formation can be eliminated, since the compression molding mat compaction speed can be set exactly from slow to fast as a function of the feed of the continuously operating press and the fiber geometry or fiber moisture.

Thus, the lateral ventilation of the mat in this area can be increased by the Einklemmstrategie, which helps to avoid excessive leakage of air against the production direction.

As advantageous, a thickness of the bendable Abrollplatte of 5-20 mm, preferably 12 mm, has proven to be 12 cylinders at 2.5 m press width as a differential cylinder pull the Abrollplatte and can press. It should be noted that in addition to the possibility of bending the Abrollplatte this should still be hardened in order not to be overloaded by the occurring Herz'schen surface pressure by the rolling elements.

In order to allow a greater bending of the sheet, the rolling plate can be fixed only at the beginning (in the direction of production) firmly on the press plate so that on the outlet side a certain clearance on the hot plate is possible.

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

Show it:

Schematically, an inlet wedge compressor of a continuously operating press with the possibility of setting a rolling plate below according to the invention,

1 an enlarged section after 1 concerning the adjustable rolling plate and

2 a diagram of the procedure with different set compression profiles.

As already stated above, a continuously operating press consists of two endlessly rotating steel belts, which are guided by deflection drums and drive drums. On the opposite surface sides of the steel strips, a press nip is created, through which the pressed material mat is pressed into wood-based panels. In this case, heat is applied via heating plates and pressure to the pressed material mat via hydraulic cylinders, the pressure being conducted via press frame for a closed load flow. For rolling support usually a roll bar carpet is used, which is guided between the steel strips and the heating plates. To protect the heating plates, these are hardened or rolling plates for the rolling rods are applied to the heating plates.

In 1 is a schematic representation of the inlet region of a continuously operating press with inlet wedge compressor. This is a pressed material mat prepared in advance by spreading machines 1 via a transfer belt 2 on the lower steel band 3 stored. Depending on the setting of the main compaction profile, the pressed material mat will hit 1 at the same time or shortly afterwards on top of the other steel band 3 , The point where both surface sides have touched the steel bands is defined as the mat contact 8th , The main compression profile is at the top of the hydraulic cylinders 5 set, here by way of example a Zweigelenksystem the upper inlet region comes into play, in which two successive Verdichtungsgradienten can be set differently. The lower area of the main compression profile is with the hydraulic cylinders 6 over the flexible inlet plate 7 set. After passing through these areas, the pressed material mat reaches 1 the area with an adjustable rolling plate 11 below. The rolling plate 11 can do this by double acting hydraulic cylinders 12 for setting a steeper compression in the direction of the pressed product mat 1 be moved or pulled away from this to set a slower compression. In the context of the invention, it is irrelevant whether in this case the inlet plate 7 and the rolling plate 11 are divided as in the drawing or if only one plate is used.

If it is determined that a steeper compression in the inlet wedge compressor is suitable for a product improvement, then, for example, a steeper compression 15 with corresponding steel strip course 14 be set. In the case of dust formation or the occurrence of blowouts in the inlet wedge compressor, on the other hand, slow compression can occur 17 with corresponding steel strip course 13 by the withdrawal of the rolling plate 11 in the direction of the heating plate 10 can be adjusted without this, the large volume-loaded hydraulic cylinder 5 and 6 must be activated. The short-stroke cylinders 12 . 18 are preferably designed as a hydraulic double-acting short-stroke cylinder, either directly in a recess on the heating plate 10 support or on the other side of the heating plate 10 are arranged on the press frame and for transmitting power to the press plate bars in bushings through the heating plate 10 use.

The entire inlet wedge compressor can in this case have a length of 2 to 4 m, wherein depending on the size in the inlet wedge compressor above two or more joints can be arranged.

2 it still represents an enlarged detail on the structure of this adjustable range for the Abrollplatte 11 Here is a second way to arrange the hydraulic cylinder 18 shown in the hot plate 10 are supported and not like the hydraulic cylinder 12 through the heating plate 10 by rich.

In 3 Finally, for a better understanding of the essence of the invention is still a diagram of the process flow shown at different set compression profiles, wherein the X-axis D represents the distance to the mat contact MK, wherein in the 1 and 2 this mat contact with the reference numeral 8th was provided. The Y-axis T indicates in the diagram the pressed material mat thickness. It can be clearly seen how after the mat contact MK the pressed material mat thickness either with a steep compression 15 reduced or in the case of blowers on a slow compression 17 can be switched. Where X is the possible variance of the thickness differences between the two settings. With 16 is a normal compaction described.

LIST OF REFERENCE NUMBERS

1

 press material mat

2

 Transfer belt

3

 steel strip

4

 roll bars

5

 hydraulic cylinders

6

 hydraulic cylinders

7

 inlet plate

8th

 Matt Contact

9

 heating plate

10

 heating plate

11

 rolling plate

12

 Short stroke

13

 Steel band profile

14

 Steel band profile

15

 Steep compression

16

 normal compression

17

 slow compression

B

 Area

X

 Adjustment

T

 mat thickness

D

 Removal of mat contact

MK

 Matt Contact

Claims (13)

Method for adjusting an inlet wedge compressor of a continuously operating press in the course of the production of material plates, wherein a pressed material mat scattered on a forming belt is disposed in a continuously operating press between two endlessly circulating steel strips ( 3 ) is pressed and cured using pressure and heat, wherein in the press inlet an inlet wedge compressor for supporting the steel strips ( 3 ) above and below from heating plates ( 9 . 10 ) with steel strip side adjacent rolling plates ( 11 ), wherein in the inlet wedge compressor a Hauptverdichtungsprofil for the pressed material mat with differentiated compression curves at the top and bottom for the steel strips ( 3 ) by means of hydraulic cylinders ( 5 . 6 ) einsteuerbar, characterized in that after Einsteuerung the Hauptverdichtungsprofiles for the respective end product in the inlet wedge compressor, if necessary 100-500 mm after bilateral contact of the steel strips ( 3 ) with the pressed material mat ( 1 ) the upper and / or the lower compression curve is variable in a short region (B), wherein by means of width-arranged hydraulic double-acting short-stroke cylinder ( 12 ) the rolling plate ( 11 ) in this short area (B) of the pressed material mat ( 1 ) or to the pressed material mat ( 1 ) and this region (B) has a length of 200 to 400 mm. A method according to claim 1, characterized in that the inlet wedge compressor a Hauptverdichtungsprofil for the pressed material mat ( 1 ) with differentiated compression curves at the top and bottom for the steel strips ( 3 ) for coarse adjustment and that the fine adjustment of the main compression profile takes place only in this area (B) of 200 to 400 mm in length. A method according to claim 1 or 2, characterized in that for changing the upper and / or the lower compression curve, the upper and / or the lower Abrollplatte ( 11 ) are moved in this area (B) perpendicular to the pressed material mat. Process according to claims 1 to 3, characterized by the use in the high-speed production of material plates of thickness up to 6 mm with feed rates over 1000 mm / s. Continuously operating press for pressing pressed material mats into material plates between two endlessly circulating steel strips ( 3 ) using pressure and heat, the steel strips ( 3 ) on hotplates ( 9 . 10 ) mounted rolling plates ( 11 ) are supported with the interposition of rolling elements, wherein for the introduction of a main compression profile with differentiated compression curves at the top and bottom for the steel strips ( 3 ) in the inlet wedge compressor by means of hydraulic cylinders ( 5 . 6 ) hydraulically movable heating plates ( 9 . 10 ) with adjacent rolling plates ( 11 ) are arranged for carrying out the method according to one of claims 1 to 4, characterized in that in the inlet wedge compressor in a range of 100-500 mm after mutual contact ( 8th ) of the upper and lower steel bands ( 3 ) with the pressed material mat ( 1 ) hydraulic double-acting short-stroke cylinders arranged over the width ( 12 . 18 ) at the top and / or at the bottom of the rolling plates ( 11 ) are articulated. Continuously operating press according to claim 5, characterized in that the double-acting short-stroke cylinders ( 12 . 18 ) are arranged in a range B of 200 to 400 mm. Continuously operating press according to claim 5 and 6, characterized in that in the region B a plurality of rows double-acting Short stroke cylinder ( 12 . 18 ) are arranged. Continuously operating press according to claims 5 to 7, characterized in that the hydraulically double-acting short-stroke cylinders ( 12 . 18 ) are supported directly in a recess on the heating plate. Continuously operating press according to claims 5 to 7, characterized in that the hydraulically double-acting short-stroke cylinder ( 12 . 18 ) below the heating plate ( 10 ) are arranged on the press frame and are arranged for transmitting power to the press plate rods through the heating plate. Continuously operating press according to claims 5 to 9, characterized in that rolling plates ( 11 ) are arranged with a thickness between 8 and 15 mm, preferably 12 mm. Continuously operating press according to claims 5 to 10, characterized in that the rolling plate ( 11 ) on the inlet side of the pressed material mat ( 1 ) firmly on the heating plate ( 10 ) is articulated. Continuously operating press according to claims 5 to 11, characterized in that an inlet wedge compressor with a length of 2 to 4 m is used. Continuously operating press according to claims 5 to 12, characterized in that in the inlet wedge compressor at the top 2 or 3 joints are arranged.

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