EP2598298A1

EP2598298A1 - Scattering head of a scattering installation for at least partially producing a scattered particle mat, scattering installation and method for producing a scattered particle mat in the course of producing material boards and a scattered particle mat for this purpose

Info

Publication number: EP2598298A1
Application number: EP11738210.1A
Authority: EP
Inventors: Gernot Von Haas
Original assignee: Dieffenbacher GmbH Maschinen und Anlagenbau
Current assignee: Dieffenbacher GmbH Maschinen und Anlagenbau
Priority date: 2010-07-26
Filing date: 2011-07-26
Publication date: 2013-06-05
Anticipated expiration: 2031-07-26
Also published as: CN103124620B; DE102010038434A1; EP2598298B1; CN103124620A; WO2012016888A1

Abstract

The invention relates to a scattering head of a scattering installation for at least partially producing a scattered particle mat, a scattering installation and a method for producing a scattered particle mat in the course of producing material boards for the production of a scattered particle mat (7) with at least partially oriented scattering by a scattering head (1) in the course of producing material boards by means of pressure and/or heat in a press, wherein the scattered particle mat (7) is at least partially formed by the scattering head (1) on a continuously circulating forming belt (8) arranged under the scattering head (1) in the falling direction of the scattered particles (3). For the method, the invention consists in that the scattered particles are oriented in the direction of production (13) in any desired sequence by a transverse orienting device (12) and/or a longitudinal orienting device (15) and are scattered on the forming belt (8) in an unoriented manner by a spoke-type scattering device (14). The scattering head is correspondingly distinguished by the fact that, for scattering the scattered particles (3), a transverse orienting device (12) and/or a longitudinal orienting device (15) are arranged together with a spoke-type scattering device (14) in any desired sequence in the direction of production (13) over the forming belt (8). A scattered particle mat for pressing is also disclosed.

Description

The invention relates to a scattering head of a scattering system for the at least partial production of a spreading material mat according to the preamble of

Claim 1, a scattering system according to claim 6, a method for

Production of a grit mat in the course of the production of material plates according to the preamble of claim 8 and a spreader mat after

Claim 10.

In the manufacture of material plates from spreadable materials, a mixture of particles or fibrous matter and a binder is scattered to a grit mat on a forming or conveyor belt, wherein the

Spreading mat then a possibly necessary pre-treatment and finally a compression is supplied. The compression can be carried out continuously or discontinuously by means of pressure and / or heat. In the usual material plates, which are produced here, it is usually MDF boards, consisting of medium density fibers or OSB plates from oriented scattered chips. The scattering is done as needed in one or more layers, with the need for multiple layers

usually occurs on thicker plates or multilayer plates. But also in the thin plate production can be different layers be desired, especially if specially differentiated requirements between the middle layer and the outer layers exist. A distinction is made between two scattering possibilities in the scattering stations; the direct scattering after the spreading material bunker, whereby by means of baffles the spreading material is led directly on a forming belt or the indirect spreading over so-called

Spreading roller systems. In the indirect scattering that falls from the

Spreading bunker discharged spreading material on so-called spreader rollers, which divide the grit and, if necessary, also sort. The scattering arrangements used in this case are already sufficiently in their diversity in the

Patent literature described, either a central task of the

Scattering material is carried out on the scattering rollers or the grit is placed at one end of the scattering rollers. In this case, a portion of the chips is transported further while another part falls through the spreader rolls through as long as on the forming belt until only unsuitable litter material remains and must be removed from the manufacturing process. Both

Principles have proven themselves in production and are used successfully.

Any scattering of grit, here shavings or chips, with a certain fine fraction of the grit, causes problems in the production of high-precision basis weight distributions. Especially at a high

Throughput of grit and in an oriented scattering arise

Stray or other basis weight inaccuracies in a scattered

Dipl.-Ing. FH Anton Hartdegen, Patent Engineer, Angerfeldstr.12, 82205 Gilching, DP1413 Page 2/19 Grit mat, which worsen the later quality of the material plate. This applies not only for the same density and quality of the material to be spread but also for inhomogeneous material choice such as plastic plates with substitutes or other mixtures.

In particular, however, is scattered in the production of oriented

Spreading mats, the transverse scattering to the production direction problematic, as in particular in the border areas inaccurate basis weight distributions are unavoidable. Also effects on the areal

Basis weight distribution far from the longitudinal edges of the spreading material mat are not completely off. In addition, the entire transverse orientation of the material to be spread with fan rollers of a transverse orientation device

Strain inaccuracy of only +/- 10% per scattering head has. As a result, grit mats with a high proportion of transversely oriented layers have a high scattering inaccuracy. At the same time, however, a scattering head needs one

Minimum length for producing a sufficiently large spreader space above the spreader rolls, in which the spreading material can be optimally distributed and dissolved in order to achieve good values of a basis weight distribution.

There are known from the prior art different Streukopfvarianten for spreaders. In the case of chip spreading for chipboard, the spreading material is sorted by size and / or density by means of a separating device, usually a roller scraping head or an air classifier, and deposited successively on a forming belt. As a rule, the fine grit is first on the

Dipl.-Ing. FH Anton Hartdegen, Patent Engineer, Angerfeldstr.12, 82205 Gilching, DP1413 Page 3/19 Formed band deposited, then the coarser grit is scattered over the fines. This gives a grit mat containing a fine topcoat and a second coarser layer. Depending on the procedure or

Spreader assembly and execution are now scattered again a coarse layer and / or again a fine layer. This results in a middle layer of similar coarse grit and two

Cover layers of fine spreading material. In contrast, systems for the production of oriented chipboard (OSB) work exactly

opposite, because here the long chips are preferably laid longitudinally oriented on the forming belt as a cover layer and the shorter and broken chips are scattered in the middle layer oriented transversely.

The invention has for its object a scatter head and a

To provide scattering system with which a material plate of at least two different layers can be produced, with respect to the state of the art in terms of simpler design now and the associated lower investment costs advantages are achievable. Next is to be created by a process to be created and thus produced grit mat an improvement of the basis weight distributions in total in the

Be available grit mat.

The solution for a scattering head is that for scattering the grit a transverse orientation device and / or a

Dipl.-Ing. FH Anton Hartdegen, Patent Engineer, Angerfeldstr.12, 82205 Gilching, DP1413 Page 4/19 Longitudinal orientation device together with a spreader device in the direction of production in any order over the forming belt

are arranged.

The solution to the problem for a scattering system consists of at least two scattering heads, wherein in at least one scattering head for scattering the material to be spread a transverse orientation device and / or a

Longitudinal orientation device together with a spreader device in the direction of production in any order over the forming belt

are arranged.

This object is achieved by the invention for the method in that the grit in the production direction in any order with a

Oriented transverse orientation device and / or a longitudinal orientation device and unoriented with a spreader

is sprinkled on the forming belt.

The method according to the invention and the spreading head according to the invention of a spreading machine have the following significant advantages over the prior art:

The proposed spreader, especially the spreading head and the

Scattering plant, in particular, tends to be shown in the figures

Variant, less for constipation or nesting of grit, since the larger grit particles by means of a dissolving device in the direction of

Dipl.-Ing. FH Anton Hartdegen, Patent Engineer, Angerfeldstr.12, 82205 Gilching, DP1413 Page 5/19 Longitudinal and / or transverse orientation devices are moved, whereas the smaller material is supplied to the sprocket particles of grit particles. The orientation and storage of essentially similar

Grit particles is always advantageous and less prone to failure. Next, the smaller particles are now evenly distributed by the spoke rollers in a highly optimal manner and placed on the forming belt or an already lying layer of a grit mat. This helps in particular to implement the specifications and wishes of the manufacturers of oriented scattered boards (OSB).

In particular, a teaching of the invention that it is not absolutely necessary to create a middle layer of oriented scattered grit. in the

On the contrary, it is believed that the neutral fiber of an OSB board should not necessarily be formed by an oriented scattered layer, but advantageously by an unoriented but very uniform layer. Through the use of the spoke rollers as a storage and distribution device for the grit on a forming belt, it is now possible for only three scattered heads produce a three-layer oriented scattered material plate on the outside, depending on requirements and production request longitudinally or transversely scattered grit and in the Middle layer has an optimized with respect to the basis weight grit layer, in particular bending stresses due to mutual

Can optimally handle loads in their middle class without

Dipl.-Ing. FH Anton Hartdegen, Patent Engineer, Angerfeldstr.12, 82205 Gilching, DP1413 Page 6/19 Show detachment phenomena. In particular, the multi-axial orientation of the scattering material in the middle layer and the additional shares of

Finest material increase the rigidity and strength of the material plate. With appropriate modifications of course, for example, five- or seven-layer material plates can be produced, the arrangement of the unoriented layer is adjustable as needed. A preferred five-layer material plate is produced from a grit mat which is spread out longitudinally, laterally in the following layer, unoriented in the middle and then again scattered transversely and outwardly in the direction of production. Overall, therefore, in the case of the material plates, an improvement in the transverse strength and in the thickness swelling occurs.

In particular, the finding is advantageous that orientable grit, in particular grit, which is used for the production of oriented scattered material plates, can be stored by means of spokes directly on a forming belt. The optimum straightening accuracy over the surface is based on the fact that the spoke rollers can optimally distribute the spreading material over a given area, which also applies in particular to orientable material.

With regard to the technical terms used, these in the present application are understood as follows:

Devices for transverse and longitudinal orientation align the orientable spreading material transversely or longitudinally to the production direction in the scattering head and set

Dipl.-Ing. FH Anton Hartdegen, Patent Engineer, Angerfeldstr.12, 82205 Gilching, DP1413 Page 7/19 it off on the form band. These devices are for transverse orientation usually from fan rollers, in which the grit falls in an upwardly oriented, over the entire length of the roller open tray, there aligns transversely to the production direction and then by the rotation of the fan roller downwardly oriented transversely out of the compartment the form band falls. In the longitudinal orientation device, walls or disk rolls oriented parallel to one another are usually used in the production direction. Disk rolls point radially to the axial extent of the roll

aligned parallel slices. By the rotation clogging is avoided and the grit is aligned longitudinally (in the production direction) and finally falls between the individual rollers on the

Shape band.

The spoke spreading device in question consists of spoke rollers, which are also called cage rollers. These spoked rollers are commonly used for dissolving and distributing a grit stream before the grit is discharged from a bunker onto spreader rolls of the transverse or longitudinal orienting nature. This is already disclosed, for example, in US Pat. No. 5,662,227 A (FIG. 2). The cage rollers or similar constructions shown here are known to those skilled in the art. Usually, the cage or spoke rollers consist of a width across the width of the forming belt centrally arranged roller, which has a disk on the outside, again at the periphery of the discs rods, wires,

Dipl.-Ing. FH Anton Hartdegen, Patent Engineer, Angerfeldstr.12, 82205 Gilching, DP1413 Page 8/19 Pipes, or similar machine elements, are fixed, which are arranged parallel to the central rotating roller.

In the proposed devices and systems, the individual spreaders are arranged in a predetermined order. Preferably, the spreaders are in a plane and / or at the same distance from the forming belt. But it may also be advantageous to make the individual spreaders with respect to the forming belt angled or to arrange at different heights or distances to the forming belt. The common feature lies in the fact that the longitudinal orientation, the

Querorientierungs- and the spreader device should be the closest to the forming belt scattering and storage device. A term suitable for this would be arranged directly above the forming belt. Any necessary dissolution device would accordingly be arranged in the fall direction of the scattering material above the scattering devices, but can

For example, in addition to the known spiked or pin rollers also consist of an array of spoke rollers that dissolve the grit before hitting the spreaders.

In a scattering system are preferably two scattering heads of

used according to the invention, the mirrored to each other in

Production direction are arranged.

In particular, results from using the above method and / or the above system and / or one of the above

Dipl.-Ing. FH Anton Hartdegen, Patent Engineer, Angerfeldstr.12, 82205 Gilching, DP1413 Page 9/19 Streussopfes a grit mat having at least one oriented layer adjacent to an unoriented layer of grit.

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:

Figure 1 is a schematic and side sectional view of a

scattering head according to the invention and a forming belt circulating below the spreading head in the production direction,

FIG. 2 shows a similar sectional view through two scattering heads (according to FIG

1) a spreading plant for producing a three-layered

Grit mat

Figure 3 shows another embodiment of a scattering head with three

different spreaders in series,

FIG. 4 shows a spreading plant with two scattering heads according to FIG. 3 for producing a five-layer spreading material mat;

Figure 5 shows an alternative scattering system for producing a five-layered

Grit mat with two scatter heads according to Figure 1 and outer scattering heads with pure longitudinal orientation and Figure 6 shows a schematic structure of a five-layer grit mat.

Dipl.-Ing. FH Anton Hartdegen, Patent Engineer, Angerfeldstr.12, 82205 Gilching, DP1413 Page 70/19 Figure 1 shows a schematic and side sectional view of a

The scattering head 1 according to the invention and a forming belt 8 circulating in the production direction 13 underneath the scattering head 1 for transporting the part formed by the spreading head 1 or separate spreading material mat 7. In the figures, the foregoing has been omitted for the sake of clarity

Spreading mat 7 with different patterns or shades of gray for the individual layers represent. Instead, there are indications of different spreaders, which store a predetermined amount of grit 3 on the forming belt 8 in their own area. The grit 3 is entered in the illustrated scattering head 1 by means of a dosing devices not shown in detail (grit hopper with discharge or the like). The task angle in the scattering head 1 is usually controlled by a task flap 16, which also takes on a task function of the material to be spread 3 on an optional opening device 1 1. The

Opening device 1 1 preferably consists of spiked rollers 9, depending on the application in different sizes or features of the spines. By the opening device 1 1 a large-area distribution of the material to be spread 3 in the scattering head 1 is effected, in particular a separation 20 (shown schematically below the forming belt) of the material to be spread 3 in a coarser fraction G and a finer fraction F over the length (in

Production direction 13) of the scattering head. 1 By this separation 20, it is clear that coarser grit 1 on the baffles 10 on the

Transverse orientation device 12 (with fan rollers 2) or alternatively not

Dipl.-Ing. FH Anton Hartdegen, Patent Engineer, Angerfeldstr.12, 82205 Gilching, DP1413 Page 11719 shown on a longitudinal orientation device 15 (with disc rollers 5) passes and oriented there is placed on the forming belt 8. The finer fraction F of the material to be spread 3 passes via optional distributor 6 to the spreader device 14 with spoked rollers 4 arranged therein in a rotating manner. The spoked rollers 4 distribute the spreading material 3 unoriented on the already oriented layer of the grit material mat 7 which is already spread.

FIG. 2 shows a double-head scattering system 17 for producing a

three-layer grit mat 7 by means of two scattered heads arranged in mirror image 1. The separation 20 of the two scattering heads 1 is accordingly also in the production direction 13 to each other

arranged opposite, so that after formation of a cover layer of transverse scattered scattered material 3 by means of a

Transverse orientation device a two-fold scattering of unoriented grit 3 from the two spoke scattering devices of the two scattering heads 1 connects. This twofold scattering causes a homogeneous layer of unoriented spreading material 3, which in turn is covered in the production direction (on the outlet side of the left scattering head 1) with a transversely oriented layer of spreading material 3, which ultimately results in the production of a three-layered material

Spreading mat of two oriented and one unoriented layer results.

FIG. 3 is an expanded embodiment of a possible scattering head 1 with three different scattering devices arranged in series, wherein

Dipl.-Ing. FH Anton Hartdegen, Patent Engineer, Angerfeldstr.12, 82205 Gilching, DP1413 Page 72/19 Production direction 13, first a longitudinal orientation device 15 with disk rollers 5, centrally with a transverse orientation device 12 with

Fan rollers 2 and the output side of a spreader device 14 is arranged with spoke rollers 4. Again, the grit 3 is first separated after the task in the scattering head 3, so that there is a separation in the production direction 13 from coarse G to fine F and thus predominantly the coarse grit 3 on the longitudinal orientation device 15 and the fine grit 3 on the spoke scattering device 14 arrived. Depending on the setting or effect of the opening device 1 1 results in a corresponding proportion of grit 3, which is arranged on the center

Transverse orientation device 12 is eliminated.

In Figure 4, with the mirror image arrangement of two scattering heads 1 of Figure 3 is a Doppelkopfstreuanlage 18 for producing a

five-layer grit mat 7 shown. In the production direction 13, a longitudinally oriented layer of coarse spreading material 1 on the forming belt 8 is first applied from the right scattering head 1, followed by a transverse layer and an unoriented layer, on the output side of scattering head 1 on the right side. After changing the scattering head 1 is again an unoriented layer of grit 3, then again a cross-oriented and finally again a longitudinally oriented layer. This in turn results in a five-layer grit mat for producing a

Dipl.-Ing. FH Anton Hartdegen, Patent Engineer, Angerfeldstr.12, 82205 Gilching, DP1413 Page 73/19 five-layer material plate, with an unoriented layer in the neutral fiber (the middle) of the material plate.

FIG. 5 shows a four-head scattering system 19 for producing a five-layer spreading material mat 7. In this exemplary embodiment, the two pure scattering heads 1 lying outside are shown to form a longitudinally oriented layer. This arrangement is particularly advantageous in the production of

Container plates with a long grit (over 150 mm in length) to the

Outer layers. Preferably, however, the spreading material is subjected to a separation 20 in these pure scattering heads 1 for longitudinal orientation. The two inner and in turn mirror images of each other arranged scattering heads 1 are designed as the scattering head of Figure 1 and form three layers (transverse and unoriented) of the grit mat. FIG. 6 shows the schematic structure of a five-layer grit mat with two outer longitudinally oriented layers 21, two underlying transverse oriented layers 22 and a middle unoriented layer 23. DP1413

Dipl.-Ing. FH Anton Hartdegen, Patent Engineer, Angerfeldstr.12, 82205 Gilching, DP1413 Page 74/19 List of Reference Numerals: DP 1413

1 . Spreading head 16 task flap

2. Fan rollers 17 double head spreading system

3. spreading material (three-layered)

4. Spoked rollers 18 Double-head spreader system

5. disk rollers (five-layered)

6. Distributor 19 four-head scattering system

7. Spreading mat (five-layered)

8. Forming band 20 Separation (in F / G)

9. spiked rollers 21 longitudinally oriented layer

10. baffles 22 transverse layer

1 1. Disintegrator 23 unoriented layer

12. Transverse orientation device

13. Production direction

14. spoke spreading device

15. Longitudinal orientation device

Dipl.-Ing. FH Anton Hartdegen, Patent Engineer, Angerfeldstr.12, 82205 Gilching, DP1413 Page 75/19

Claims

Patent claims

Spreading head (1) of a spreading system for producing at least part of an at least partially oriented spreading mat (7), which is pressed in a press by means of pressure and / or heat in the course of the production of material panels, the

Grid mat (7) is formed on an endlessly rotating forming belt (8) arranged in the direction of fall of the grit (3) under the spreading head (1), characterized in that

for scattering the grit (3), a transverse orientation device (12) and/or a longitudinal orientation device (15)

together with a spoke spreading device (14)

are arranged in any order above the forming belt (8) in the production direction (13).

Spreading head according to claim 1, characterized in that for spreading the spreading material (3) in the spoke spreading device (14) at least one spoke roller (4), in which

Transverse orientation device (12) at least one fan roller

(2) and/or at least one disk roller (5) is arranged in the longitudinal orientation device (15).

Dipl.-Ing. FH Anton Hartdegen, patent engineer, Angerfeldstr.12, 82205 Gilching, DP1413 page 76/19

3. Spreading head according to claim 1 or 2, characterized in that in the spreading head (1).

Transverse orientation device (12) and/or the

Longitudinal orientation device (15) and the

Spoke spreading device (14) are arranged essentially in one plane.

4. Spreading head according to one or more of the previous ones

Claims, characterized in that the

Transverse orientation device (12), which

Longitudinal orientation device (15) and/or the

Spoke spreading device (14) are arranged directly above the forming belt (8).

5. Spreading head according to one or more of the previous ones

Claims, characterized in that in

Direction of fall of the spreading material (3) in front of the

Transverse orientation device (12) and/or the

Longitudinal orientation device (15) and/or the

Spoke spreading device (14) at least one opening device (11) is arranged.

Dipl.-Ing. FH Anton Hartdegen, patent engineer, Angerfeldstr.12, 82205 Gilching, DP1413 page 77/19

6. Spreading system, consisting of at least two spreading heads (1), with a transverse orientation device (12) and / or a transverse orientation device (12) in at least one spreading head (1) for spreading the spreading material (3).

Longitudinal orientation device (15) together with a

Spoke spreading device (14) is arranged in any order above the forming belt (8) in the production direction (13).

7. Spreading system according to claim 6, thereby

characterized in that at least two scattering heads (1) are arranged mirror-inverted in the production direction (13).

Method for producing an at least partially oriented spreading material mat (7) with a spreading head (1) in the course of producing material panels using pressure and/or heat in a press, the spreading material mat (7) being at least partially supported by the spreading head (1) on a in the direction of fall of the spreading material (3) under the spreading head (1) is formed by an endlessly rotating forming belt (8), characterized in that

the grit in the production direction (13) in any order with a transverse orientation device (12) and/or a

Longitudinal orientation device (15) oriented

and unoriented with a spoke spreading device (14).

on the forming belt

(8) is scattered.

Dipl.-Ing. FH Anton Hartdegen, patent engineer, Angerfeldstr.12, 82205 Gilching, DP1413 page 78/19

9. The method according to claim 8, characterized in that the grit (3) before scattering by means of a

Dissolving device (11) is dissolved in the spreading head (1).

Grit mat (7) for producing material panels by means of pressure and/or heat in a press, produced by the method according to claim 8 and/or with a spreading head according to claim 1, with at least one oriented and one adjacent

unoriented layer of grit (3).

Dipl.-Ing. FH Anton Hartdegen, patent engineer, Angerfeldstr.12, 82205 Gilching, DP1413 page 79/19