EP2714351A1

EP2714351A1 - Method and plant for producing material boards, and a device for compressing the narrow sides of a pressed-material mat

Info

Publication number: EP2714351A1
Application number: EP12724139.6A
Authority: EP
Inventors: Detlef Kroll
Original assignee: Dieffenbacher GmbH Maschinen und Anlagenbau
Current assignee: Dieffenbacher GmbH Maschinen und Anlagenbau
Priority date: 2011-05-28
Filing date: 2012-05-27
Publication date: 2014-04-09
Anticipated expiration: 2032-05-27
Also published as: CA2836846A1; WO2012163867A1; BR112013030434A2; EP2714351B1; RU2013158692A; CN103547418B; DE102011076655A1; US20140096887A1; CN103547418A; RU2621917C2; US9452546B2

Abstract

The invention relates to a method, a plant and a device for producing material boards in a press (16) from spreading material (10), wherein a pressed-material mat (2) made of the spreading material (10) is spread by means of a spreading device (11) onto an endlessly circulating forming belt (23) and the pressed-material mat (2), during transport through the press (16), is compressed at its narrow sides (1) transversely to the production direction (22) by means of a compression device (6). The invention for the plant consists in that at least one compression device (6) for compressing the pressed-material mat (2) by displacing the narrow sides (1) in the direction of the longitudinal central axis of the pressed-material mat (2) and/or by compressing a region, adjoining the narrow sides (1), of the surface side of the pressed-material mat (2) is arranged between the press (16) and the spreading device (11). A device according to the invention has at least one means for compressing the pressed-material mat (2) by displacing the narrow sides (1) in the direction of the longitudinal central axis of the pressed-material mat (2) and/or by compressing a region, adjoining the narrow sides (1), of the surface side of the pressed-material mat (2).

Description

METHOD AND APPARATUS FOR PRODUCING MATERIAL PLATES, AND A DEVICE FOR COMPRISING THE NARROWING SIDE OF A PRESS GUTMATTE

The invention relates to a method for producing material plates, such as

Chip, chip, fiber or similar wood-based panels as well

Plastic sheets according to the preamble of claim 1, a plant according to the preamble of claim 7 and a device according to the

Preamble of claim 13.

0

The production of at least partially wood-containing chipboard or particle boards, for example OSB or MDF boards, is state of the art.

In summary, different fractions are screened from existing base material in the production of sandwich panels (OSB),

5 pretreated, glued, by means of spreading machines on a forming belt

sprinkled evenly and compressed in presses (continuous or clock-bound). To this end, different is the fiberboard (for example, MDF), in which the base material is usually disrupted in a refiner with steam and broken down into relatively small fiber material.

0 One of the fundamental challenges of this technology has been counting

Decades of optimal production and transportation of so-called

Pressgutmatten on a form band. With DE 198 58 096 A1 an apparatus and a method for scattering particles has become known to a nonwoven, in which is described very extensive and detailed, such as pressed material mats (nonwovens) scattered, then pretreated and transported and in a continuous or intermittent press be pressed. In particular, this revelation also deals with the details of how a pressed material mat optimally trimmed (continuously cut on the longitudinal sides) and how different widths of a pressed material mat can be set and used in a system for producing different batch sizes. In particular, it is important that in addition to a trimming the pressed material mat on their

Long sides (narrow sides) with the help of edge sheets along the

Transport direction can be performed. It is further disclosed that mats of different widths can be produced on a plant when the trimming devices are displaceable and adjustable transversely to the transport direction. In principle, the trimming and also the device and the method mentioned above by way of example for the prior art have proved themselves.

In the course of progress in the last decade and newly developed, more suitable gluing systems (adhesive fleets), among other things, more and more steam presses have been used. Also, in the course of this

Various compression and compression strategies for the rapid and effective compression and venting of a pressed material mat have been introduced. On the part of the plant operators, it is also increasingly desired that Plate edges have excessive edge densities to later in the panels produced a certain edge stability against shocks or even

To effect machining operations. Now, an edge (density) superelevation only in the scattering device (which, if necessary, also from several

Scattering devices may consist) set and scattered, then usually the edge overshoot is separated by a trimming at least partially again. Accordingly strong must

Edge elevations are set to show an effect in the further manufacturing process. The disadvantage is the associated large

Quantity of material that must be returned to the production cycle. Nevertheless, the freshly edged narrow sides are one

Pressgutmatte quite susceptible to vibration and handovers on

Continuing transport or forming belts, so that in a Pressgutmatte the narrow sides usually when reaching or passing through a

Pre-press and / or the main press disintegration. The dissolution phenomena are in the course of compaction and / or

Evaporating even more when the optional pre-press or main press has a relatively steep compression gradient, such that the excess air / steam is between the compacted face sides

(Surface bottom / top) also or only on the narrow sides must dodge and there during the venting process usually quite material blows from the narrow side of the pressed material mat. In particular, there is For process variants serious disadvantages if a narrow side is not robust enough.

The task for a procedure to be created and a system to be created, or device, is to produce a pressed material mat in the course of the process

Transportes between a scattering station and a press to treat such that the Pressgutmatten on at least one narrow side less

Dissolution phenomena in the course of production and that in different process strategies in the course of pressing such Pressgutmatten better results can be achieved.

The solution for the method is that the press material mat is compacted in the course of transport to the press by means of a compacting device on its narrow sides transverse to the production direction.

The solution to the problem for a system is that between the press and the scattering device at least one compression device for compressing the pressed material by moving the narrow sides in

Direction of the longitudinal center axis of the pressed material mat and / or by compacting an adjacent to the narrow sides region of the surface side of the pressed material mat is arranged. The solution for a device for compacting the narrow sides of a pressed material mat in a plant for the production of material plates, such as chip, chip, fiber or similar wood-based panels and plastic plates, with a press and at least one spreader for creating a pressed material mat from grit, is to in that in the device at least one means for compressing the pressed material mat by moving the

Narrow sides in the direction of the longitudinal center axis of the pressed material mat and / or by compacting an adjacent to the narrow sides region of the surface side of the pressed material mat is arranged.

The present invention preferably relates to the production of OSB material panels, of course, can also be applied in other manufacturing processes, such as MDF, chip or in the production of fiber insulation mats and panels. Fiber insulation mats have been improved and redeveloped over the last decade to become independent of plastic-based base material, thus reinforcing wood fibers with PMDI-containing adhesives or bicomponent fibers

(Beleimfasern with two different types of plastic, usually lying outside a fusible and re-curable plastic as a binder and inside a higher melting plastic as a fiber-like but rigid link within the plate). The device or system is essentially suitable for carrying out the method, but can also be operated independently. It is also to be assumed that Device-related features of the system from the description in the device and vice versa are used.

It has now been shown in an advantageous manner that the compression of the

Narrow sides transverse to the transport direction (accompanied by a more or less strong reduction of the original width B1 or B2 width of the

Pressgutmatte to a width B3) reduces the described phenomena of disintegration on the narrow sides in the course of transport, venting or active / passive fluidization. By active fluidization is meant, for example, the introduction of steam, steam-air mixtures and / or pure hot air application for heating the pressed material mat and / or for activation of the binder. Among other things, passive fluidization here means the use of a steam pulse that occurs when a moisture-containing pressed product mat comes into contact with heat-transferring means (heated or heated steel and / or fabric tapes) or heat within the material to be pressed (microwave, high-frequency) and thus within the pressed material mat, a steam front is formed, which preferably exits via the narrow sides. Especially with these

Stable narrow sides are desired in process applications that help to adjust some vapor or fluid mean pressure within the press mat, especially during compaction / compression / cure. Accordingly, a higher dense narrow side compared to the middle Areas of Pressgutmatte (across the production direction across the width) of advantage because here a kind of natural barrier is built.

Advantageously, the device / system or the method can be configured as in the following embodiments:

In a simple embodiment, a wheel is arranged on at least one narrow side of the pressed material mat or over an edge region of the surface side, around a substantially vertical axis.

The invention understands the surface and axis alignment of

essential parts as follows: The pressed material is mat by means of a

Scattering device substantially horizontally and preferably scattered on a moving and endlessly circulating forming belt, wherein the

Pressgutmatte two surface sides (including one in contact with the forming belt) and two narrow sides, wherein the narrow sides parallel to

Production direction run. In this case, the wheel, respectively the axis thereof, preferably so employed to Pressgutmatte that during the

Passing the pressed material mat, the surface of the narrow side is pressed and / or displaced in the direction of the longitudinal center of the pressed material mat, thus reducing the width of the pressed material mat and increasing the density or compaction in the edge region (on the narrow sides) of the pressed material mat. Due to the associated physical effects, in particular a higher adhesion effect between the individual particles, chips, fibers or the like in the edge regions, has in the further course Pressgutmatte, especially during transport or when crossing from one conveyor belt to the next, no or only very small

Dissolution phenomena. Advantageously, so that the pollution of the system itself is reduced. In a further embodiment, the peripheral surface of the wheel can be shaped in this way or the axis of the wheel can have an angle to a vertical axis, so that the upper, free surface side of the pressed material mat is more compacted than the surface side of the pressed material mat lying on the forming belt. In particular, however, it is preferably provided that the wheel in both

Main axis directions in the angle is adjustable, and thus at least two differentiated angles and geometries on the narrow sides of the pressed material mat are adjustable. The wheel preferably runs freely through the resulting friction on the pressed material mat, but depending on the material used in the pressed material mat can also usefully be driven, in particular regulated. It is alternatively possible to adjust the circumference of the wheel in synchronism with the production speed or even, depending on the desired effect, to rotate faster or slower, so that the peripheral surface of the wheel rotates faster or slower than the passing Pressgutmatte. The surface of the wheel may also be roughened in variations, provided with steps, printing patterns or the like. It is also conceivable a rubberized or friction-promoting surface, which preferably avoids displacements of the material to be spread against the production direction and the spreading material of the pressed product mat uniformly, preferably transversely to the production direction, in Moves direction of the longitudinal center axis of the pressed material mat. A proven diameter in OSB production (the grit, respectively

Pressgutmatte consists of oriented scattered chips) is a diameter of the wheel from 0.5 m to 2 m. This size is also conceivable with other scattered goods.

In principle, however, it is also conceivable, in the case of controlled driven wheels or compression means for edge compaction of the pressed material mat

Compression and / or displacement effects in or against the

To use the production direction within the edge regions of the pressed material mat in order to control or regulate the course of compaction in the edge region in a targeted manner. For example, in a faster-running wheel, the spreading material in the edge region can be pressed more against the spreading material running in the direction of production in order (in the direction of production after the

Compacting device) another dynamically changing

To obtain a degree of compaction, which has a dynamic compression gradient in the course of compaction (in the region of the compacting device) in a range between transverse to and in the direction of production. Depending on the production process or material used, it may still be useful to trim the narrow side before or after the compacting device. In this context, it would be beneficial if the

Trimming device together with the compacting device on one Adjustment device, but still adjustable from each other, would be arranged. Alternatively, the separate devices should be adjustable in their distance from the narrow sides of the pressed material mat to ensure optimum width adjustment of the pressed material mat and / or compression of the narrow sides. In this context, usually spoken by a device, but preferably both narrow sides are uniformly equipped, so that a pressed material mat on both narrow sides, preferably at the same time, reduced by the compacting device in its width and the narrow sides are compacted.

For more sensitive and / or higher-grade spreading material, it may be conceivable to carry out the compacting device as baffles provided with an angle or with a curved profile. Also endlessly circulating compression bands are conceivable. OSB production has proven to be successful when the edge areas of the

Pressgutmatte be compressed in a length transverse to the direction of production, which correspond to about 75% of the length of a chip (Spans), preferably up to 50% of the length of a chip. 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. Show it:

1 shows a part of a plant for producing a material plate (without

Preliminary and final production) in a schematic side view starting with a spreading device over an endless forming belt and a subsequent continuously operating press,

Figure 2 is a plan view of the system of Figure 1 and the exemplary

Pre-compaction trimming and edge compaction of the pressed material mat before entering the press,

Figure 3 is an enlarged plan view of an embodiment with a

Trimming device (milling machine) and edge compaction by means of a compacting device (wheel) in front of the inlet of the pressed material mat in a press,

Figure 4 in a sectional view transverse to the direction of production a first

Setting angle (a) of the compacting device to a vertical axis,

Figure 5 in a sectional view along the production direction a second

Setting angle (β) of the compacting device to a vertical axis,

Figure 6 is a schematic plan view of the effect of a in

Production direction arranged trimming device and a compacting device and Figure 7 shows another embodiment of a possible

Compaction device with an endless belt associated baffles. In the figures 1 and 2, a system is shown in a schematic view starting with a spreader 1 1 over an endless forming belt 23 and a subsequent continuously operating press 16. In the usual production process, the scattering device 1 1 scatters the incoming spreading material 10 onto the endless forming belt 23 as a pressed material mat 2. Depending on

Embodiment or variant, the scattering device 1 1 thereby also a grit hopper (not shown separately), wherein the supply of grit 10 and its treatment (prefabrication) will not be further described. Depending on the application, the created pressed material mat 2 in a pre-press 12 a pre-compression and possibly other pretreatments (for example, evaporation, humidification) experienced before entering the press 16. Shortly before the press 16 is usually a discharge chute 13, in the

Inferior or hazardous Pressgutmatten 2 can be dropped by means of a reversible Überlassase 14. In general, it is afterwards in

Production direction 22 an intermediate conveyor 15 which is optimally aligned for the pressed material mat 2 to the continuously operating press 16 to

to hand over. The continuously working press 16 finally squeezes, mostly under the influence of temperature, the pressed material mat 2 to a plate strand 21, which emerges hardened at the end of the press 16. The press 16 is preferably designed as a double belt press, wherein the steel bands 17 are guided around idler pulleys 20 and opposite in a press frame 19 and supported by heating plates 18 form a press nip. The exact embodiments of continuously operating presses are also referred to the prior art. It is also conceivable that here is one

Clock press is used. In this case, the Pressgutmatte 2 is divided in advance accordingly.

In the course of the invention, the Pressgutmatte 2 is now by means of

If the press material mat 2 is trimmed is not compressed, but the width of the pressed material mat is also lower, as exemplified with a front in the production direction 22 Besäumvorrichtung 4 and as in the top view of Figure 2 is shown. The reduction of the pressed material mat are not to scale but exaggerated to illustrate the teachings of the invention.

In the figure 3 is essentially the method for the preparation of

Material plates, such as chip, chips, fiber or the like

Wood-based panels and plastic panels, with a press 16 from grit 10, wherein a pressed material mat 2 from the spreading material 10 by means of a scattering device 1 1 scattered on an endlessly circulating forming belt 23 is most likely to describe. In the course of transport to the press 16, the pressed material mat 2 is compressed transversely to the production direction 22 by means of a compacting device 6 on its narrow sides 1. It is preferably provided that the narrow sides 1 in the production direction 22 before the

Compression device 6 are trimmed with a Besäumvorrichtung 4. As shown, can not be shown as a compacting device 6, a rotating wheel 3, or a baffles or an endlessly rotating

Compaction belt 26, see. Figure 7, is used.

In particular, it is preferred that the compression on the narrow sides 1 of the pressed material mat 2 by moving the narrow sides 1 in the direction of

Longitudinal center axis of the pressed material mat 2 and / or by compressing an adjacent to the narrow sides 1 region of the surface side of the pressed material mat 2 is performed. The latter is shown in Figure 3 only indirectly, because a compression area 7 is formed according to the figure 3, characterized in that the

Narrow sides are pressed in the direction of the longitudinal center axis and thus an edge region, here compression region 7, arises, which has a higher density. Alternatively or additionally, in this edge region with similar means from above, that is to say over the surface side, but adjacent to the narrow side, the edge region of the pressed material mat 2 can be compacted with similar means as described. In particular, it would be preferred that the compression of a region adjacent to the narrow sides 1 Surface side of the pressed material mat 2 after compression on the narrow sides 1 of the pressed material mat 2 by moving the narrow sides 1 in the direction of the longitudinal center axis of the pressed material mat 2 is performed. This results in a multiaxial compression. In particular, however, can be avoided by the compression of the edge region forms an edge elevation, which may have harmful effects on the tape shape and / or other machine elements of the subsequent pre-press and / or the press. Preference is given to the edge region of increased density and height back to normal height of the pristine

Pressed material mat, or even adjusted below.

In Figure 3 is thus a total of a plant for the production of material plates, such as chip, chip, fiber or similar wood-based panels and

Plastic plates to see with a press 16 and at least one scattering device 1 1 for creating a scattered Pressgutmatte 2 from spreading material 10, in which between the press 16 and the scattering device 1 1 at least one compaction device 6 for compressing the pressed material 2 by

Moving the narrow sides 1 in the direction of the longitudinal center axis of the

Pressgutmatte 2 and / or by compressing an adjacent to the narrow sides 1 area of the surface side of the pressed material mat 2 is arranged.

According to FIGS. 4 and 5, the compression device 6 is preferably adjustable in one of two angles α and β with respect to a vertical axis 9 is arranged, wherein the angle α is substantially transverse to

Production direction 22 and the angle ß substantially longitudinal to

Production direction 22 is aligned. In this case, the axis 9 is arranged vertically and the axis 8 is shown at the corresponding angle to the axis 9.

As shown in FIGS. 6 and 7, the compression device 6 and / or the trimming device 4 can be arranged to be adjustable simultaneously and / or separately by means of adjusting devices 24/25. In addition, it is conceivable that the surfaces of the compacting device 6 which come into contact with the narrow sides 1 are essentially provided with a high coefficient of friction, preferably gummed or corrugated. Overall, it is thus possible with a system at least one device with at least one means for compressing the pressed material 2 by moving the narrow sides 1 in the direction of the longitudinal center axis of the pressed material 2 and / or by compressing an adjacent to the narrow sides 1 area of the surface side of the pressed material 2 in To arrange direction of the forming belt. Such a device for compacting one of the narrow sides 1 adjacent

Area of the area side is not for simplicity again

represented, it corresponds by and large to that described

Device, but is not arranged along a vertical axis but a horizontal axis, wherein the horizontal axis transverse to

Production direction and substantially parallel to the surface side of

Pressgutmatte 2 would be arranged. The appropriate adjustment options Of course, the angles α and β would still be given and usable for optimal compaction.

As shown in FIGS. 6 and 7 by double arrows, in a preferred embodiment, for any conceivable deformation geometries, the installation and the apparatus have adjusting devices 24 and 25 which permit adjustment of the edge area to be compacted or edged on the narrow sides 1 of the pressed material mat 2. In the case of an endless compression belt 26, it is conceivable to guide it at the contact points with the narrow sides / surface sides via at least one pressure roller or guide plate 27. (1423)

List of Reference Numerals: P1423

1 . Narrow side 19. Press frame

2. Pressgutmatte 20. deflection drum

3rd wheel 21. drive train

4. Trimming device 22. Production direction

5th saw 23. Forming band

6. Compaction device 24. Adjustment device

7. Compaction area 25. Adjustment device

8th axis (angular) 26. Compaction belt

9th axis (vertical) 27 baffle

10. spreading material

1 1. spreader

12. Prepress α angle transverse to 22

13. discharge chute ß angle along 22nd

14. Transfer nose (reversible)

15. Intermediate conveyor B1 Width Pressed material mat after 1 1

16. Press B2 Width press mat after 4

17. Steel straps B3 Wide press mat according to 6

18. Heating plates B23 Wide forming belt 23

Claims

claims

1. A process for the production of material plates, such as chip, chips, fiber or similar wood-based panels and plastic plates, with a press (16) from grit (10), wherein a pressed material mat (2) from the grit (10) by means of a spreader ( 11) is scattered on an endlessly circulating forming belt (23) and the pressed material mat (2) in the course of transport to the press (16) by means of a

Compression device (6) is compacted at its narrow sides (1) transversely to the production direction (22).

2. The method according to claim 1, characterized in that the narrow sides (1) in the production direction (22) before the

Compression device (6) are trimmed with a trimming device (4).

3. The method according to claim 1, characterized in that as a compacting device (6) a rotating wheel (3), baffles or an endlessly circulating compression belt (26) is used.

4. The method according to at least one of the preceding claims, characterized in that the

Compression device (6) preferably in one of two angles α and ß with respect to a vertical axis (9) is adjustable, wherein the angle α is oriented substantially transversely to the production direction (22) and the angle ß substantially longitudinally to the production direction (22).

5. The method according to at least one of the preceding claims, characterized in that the compression on the narrow sides (1) of the pressed material mat (2) by moving the

Narrow sides (1) in the direction of the longitudinal center axis of the pressed material mat (2) and / or by compacting an on the narrow sides (1) adjacent region of the surface side of the pressed material mat (2) is performed.

6. The method according to at least one of the preceding claims, characterized in that the compression of one of the narrow sides (1) adjacent region of the surface side of the pressed material mat (2) after compression on the narrow sides (1) of the pressed material mat (2) by moving the narrow sides (1) in the direction of the longitudinal center axis of the pressed material mat (2) is performed.

7. Plant for the production of material plates, such as chip, chips, fiber or similar wood-based panels and plastic plates, with a press (16) and at least one spreader (11) for Creation of a scattered Pressgutmatte (2) from grit (10), characterized in that between the press (16) and the scattering device (11) at least one compression device (6) for compressing the pressed material mat (2) by moving the narrow sides (1) Direction of the longitudinal center axis of the pressed material mat (2) and / or by compacting one of the narrow sides (1) adjacent region of the surface side of the pressed material mat (2) is arranged.

8. Plant according to claim 7, characterized in that in the direction of production (22) in front of the compacting device (6) a trimming device (4) is arranged.

9. Plant according to claim 7 or 8, characterized in that as a compacting device (6) a rotating wheel (3), baffles or an endlessly circulating compression belt (26) is arranged.

10. Plant according to at least one of the preceding claims 7 to 9, characterized in that the

Compaction device (6) is preferably arranged adjustable in one of two angles α and ß with respect to a vertical axis (9), wherein the angle α is substantially transverse to the production direction (22). and the angle β is oriented substantially longitudinally to the production direction (22).

11. Plant according to at least one of the preceding claims 7 to 10, characterized in that the

Compression device (6) and / or the Besäumvorrichtung (4) simultaneously and / or separated from each other by means of adjusting devices (24/25) are arranged adjustable.

12. Plant according to at least one of the preceding claims 7 to 11, characterized in that the with

Narrow sides (1) in contact surfaces of the

Compacting device (6) substantially with a high

Frictional value are equipped, preferably rubberized or grooved.

13. Device for compacting the narrow sides of a pressed material mat in a plant for the production of material plates, such as chip,

Schnitzel, fiber or similar wood-based panels as well

Plastic plates, with a press (16) and at least one

Scattering device (11) for creating a pressed material mat (2)

Grit (10), characterized in that in the device at least one means for compressing the pressed material mat (2) by moving the narrow sides (1) in the direction of

Longitudinal center axis of the pressed material mat (2) and / or by compaction one of the narrow sides (1) adjacent region of the surface side of the pressed material mat (2) is arranged.