WO2020239779A1

WO2020239779A1 - Device and method for producing a binder mix, and system for producing material boards

Info

Publication number: WO2020239779A1
Application number: PCT/EP2020/064598
Authority: WO
Inventors: Dieter GEUGIS
Original assignee: Dieffenbacher GmbH Maschinen- und Anlagenbau
Priority date: 2019-05-27
Filing date: 2020-05-26
Publication date: 2020-12-03
Also published as: EP3976241A1; DE102019114067A1

Abstract

The invention relates to a device (1) for producing a binder mix (12) when producing material boards, the binder mix (12) comprising at least one binder and one liquid, the device having: at least one reservoir (3), into which a first premix (10) of binder and liquid is fed and temporarily stored; at least one pump (4), which is arranged after the reservoir (3) and conveys a second premix (11) out of the at least one reservoir (3); and a feed apparatus (6), which is arranged after the pump (4), for feeding a further liquid (13) to the second premix (11) in order to produce the binder mix (12), wherein at least one sensor (S1, S2, S3) for determining the binder content in the first premix (10) and/or second premix (11) and/or the binder mix (12) is arranged before and/or after the at least one reservoir (3). The invention further relates to a system (20) for producing material boards (6) and to a method for producing a binder mix.

Description

DEVICE AND METHOD FOR MANUFACTURING A BINDING AGENT MIX, AND SYSTEM FOR MANUFACTURING MATERIAL PANELS

The present invention relates to an apparatus for making a

Binder mixture according to the preamble of claim 1, an installation for

Production of material panels according to claim 9 and a method for producing a binder mixture according to claim 10.

In the production of material panels, in particular wood-based panels, a binding agent is used to connect the individual particles of the material panel. For this purpose, the binding agent is usually delivered in undiluted or only slightly diluted form and fed to a central storage tank, from which the binding agent is then metered as a binding agent mixture for the production of the material panels. The binder content of the binder mixture is of particular importance for the strength of the material plate.

In the prior art it is therefore known to examine the binding agent upon delivery by means of random samples in order to be able to determine to what extent the binding agent delivered has been diluted. Since the values can fluctuate over a wide range, there is also a constantly fluctuating binder mixture in the storage tank, since the binder that is still present and the newly delivered binder are mixed here. The production of the material panels is therefore also subject to fluctuations, which can lead to the material panels not having the desired strength. On the other hand, excessive use of the binder results in higher production costs.

Therefore, the object of the present invention is a device and a method for producing a binder mixture such as a plant for producing Specify material panels which overcome the disadvantages in the prior art and which allow an improved production of a binder mixture, in particular a constant binder mixture.

It is a further object of the present invention to provide a device and a method for producing a binder mixture, such as an installation for producing material panels, which allows quality assurance.

It is yet another object of the present invention to provide an apparatus and a method for producing a binder mixture and a plant for

Specify the manufacture of material panels, by means of which the use of

Binder is improved and the production costs of material panels can be reduced.

These and other objects are achieved by an apparatus and a method for producing a binder mixture as set out in the independent claims.

As a first solution, a device for the production of a binder mixture in the course of the production of material panels is specified, the

Binding agent mixture comprises at least one binding agent and a liquid, with at least one storage container, in which a first premix of binding agent and liquid is supplied and temporarily stored, with at least one pump which is arranged after the storage container and conveys a second premix from the at least one storage container, and with a supply device, which is arranged after the pump, for supplying a further liquid to the second premix to produce the binder mixture. The invention is characterized in that at least one sensor for determining the binder content in the first premix and / or second premix and / or the binder mixture is arranged upstream and / or downstream of the at least one storage container.

As a result of the continuous measurement of the binder content, in particular, the binder mixture can be produced in accordance with the necessary requirements for a stable material panel, without an excessive, unnecessary one Use amount of the expensive binder. This can significantly reduce costs. On the other hand, not too little binder is used, which also avoids rejecting material panels due to insufficient strength.

By measuring the first premix, the delivered amount of binder can also be checked, and this in particular continuously, so that

Fluctuations in delivery were also determined and accordingly

can be documented.

In an advantageous embodiment, the at least one sensor is a capacitive sensor. A capacitive sensor shows a particular sensitivity when measuring liquids and the components contained or dissolved therein. There is thus a good possibility of calibrating the components of the premix and / or

Binder mixture, so that a very precise measurement of the premix and / or binder composition is made possible.

Alternatively or in combination, the at least one sensor is a microwave sensor which enables a very precise measurement of the liquid, in particular of water in the premix and / or the binder mixture.

A preferred embodiment of the device is characterized in that the at least one sensor is arranged upstream and / or downstream of the pump and / or the feed device. An arrangement immediately before and / or after the pump and in front of the

The feed device makes it possible to determine the binder content of the second premix and to control the feed of a further liquid in the feed device accordingly, so that the binder mixture has a specific one

Does not fall below the binder content. Furthermore, the binder mixture can be determined exactly via a sensor which is arranged after the feed device, in particular the binder content. It is therefore particularly advantageous if a sensor is arranged in front of the feed device and a sensor is arranged after the feed device, so that both for the second premixing and for the

Binder mixture the proportion of binder can be determined and checked. The binding agent is preferably a glue, in particular a glue based on isocyanate or aminoplasts, in particular phenolic and / or urea resins. The use of these glues is particularly important for

Production of wood panels is preferred.

In particular, the proportion of binder can be the proportion of solid resin in the

Binding agent, especially the glue act.

Alternatively or in combination, it is the liquid, which is a

Can be part of the first and / or second premix or which can be added to the second premix in the feed device in order to add water.

A control device is preferably arranged, which the pump and / or

The feed device controls or regulates in such a way that the binder mixture does not fall below a predetermined binder content. In this way it can be ensured that the proportion of binder in the binder mixture is not too small, so that the material panel to be produced does not have a certain strength

falls below. The amount of the second premix can be increased via the control or regulation of the pump, so that overall the proportion of binder in the binder mixture can be increased as a result. The control or regulation of the feed device makes it possible to adjust the addition of liquid to the second premix in such a way that the proportion of binder in the binder mix does not exceed a certain value, which means that production costs can be reduced. In particular, there can also be no addition of liquid via the

Provide a feed device if the second premix already has the desired binder content.

Alternatively or in combination, the binder mixture has a binder content of 40% to 65%, preferably 45% to 60%, particularly preferably 50% to 60%.

The binder mixture then has the necessary amount of binder for the production of material panels with sufficient strength. The upper limit on the proportion of binder in the binder mixture ensures, in particular, that there is too much binder for the production of the material sheet is used and this increases production costs.

The binder content of the first is advantageously measured

Premix and / or second premix and / or the binder mixture continuously. Continuous measurement enables temporary fluctuations to be determined and a corresponding reaction to take place promptly.

Alternatively, the measurement can also take place in a clocked manner, the cycle time being less than 5 seconds, preferably less than 2 seconds, particularly preferably less than 0.5

Seconds. In addition, the measured values can be averaged over a certain period of time.

An advantageous embodiment is characterized in that a log with parameters of the first premix and / or second premix and / or the binder mixture can be displayed or output via the control device. This allows time courses to be determined in order to better compensate for fluctuations overall. In particular, the log of the first premix makes it possible to determine the proportion of binding agent in this delivered premix and to use the log to provide appropriate evidence, for example the quantity and quantity delivered

Composition, to be able to lead.

Another solution relates to a plant for the production of material panels, comprising a device as set out above, a mixing station for mixing a material, in particular lignocellulosic material, with the binder mixture for producing a glued material, a scattering station for sprinkling the glued material onto a molding belt, and a press for

Pressing the glued material into a material panel. The composition of the

Binder mixture plays a special role, as this can vary the properties of the material panel. By measuring the proportion of binding agent in the binding agent mixture before the mixing station, the amount of binding agent used can be determined exactly, whereby the amount of binding agent used can be reduced to a minimum and thus cost savings can be achieved. On the other hand, a incorrect binder mixture with too little binder content can be avoided.

Another solution is through a method of making a

Binder mixture specified in the course of the production of material panels, the binder mixture comprising at least one binder component and a liquid, wherein a first premix of binder and at least one

Liquid is fed to a storage container and temporarily stored there, with a second premix of binder and at least one liquid

Storage container is removed by means of a pump and this second premix is supplied with a further liquid for producing the binder mixture. The method is characterized in particular in that the proportion of binder in the first premix and / or second premix and / or the binder mixture is determined via a sensor.

The supply of liquid to the second premix for producing the binder mixture is advantageously controlled or regulated via a control device in such a way that the binder mixture does not fall below a predetermined proportion of binder. This can in particular reduce the quality of the

Material plates are ensured.

The binder mixture preferably has a binder content of 40% to 65%, preferably 45% to 60%, particularly preferably 50% to 60%.

A preferred embodiment is characterized in that in the feed device

Additives, in particular color solutions and / or hardener solutions, are added to the second premix. Through the additives, especially through the

Hardener solution, the later reaction and hardening of the glue in the

Material plate can be timed or regulated. By adding

Color solutions, the appearance of the material panel and the particles associated with this binder mixture can be influenced in a targeted manner in order to achieve better recognition.

Advantageously, during and / or after the measurement, parameters in particular the proportion of binder and / or proportion of liquid, of the first premix and / or second premix and / or of the binder mixture is determined and recorded. In particular, the determination and logging can take place continuously.

Further advantageous measures and embodiments of the subject matter of

Invention emerge from the dependent claims and the following description with the drawings.

The invention is described in detail below with reference to the figures.

Show it:

Figure 1 shows an inventive device for producing a

Binder mixture; and

Figure 2 is a schematic representation of a plant for the production of

Material plates.

In Figure 1, the structure of a device 1 for the production of a binding agent device 12, as this is used in particular in a plant for the production of material panels, in particular wood-based panels such as chipboard, fiber or OSB panels.

The device 1 has a connection 2, via which a supplied first premix 10, which has a binder component and a liquid component, is fed to the storage containers 3a, 3b. The delivery can be made, for example, via a tank truck which is filled with a first premix 10. In order to feed the first premix 10 to the storage containers 3a, 3b, a feed pump can be arranged between these and the connection (not shown).

To measure the composition of the first premix 10, there is a sensor S1 in the transport path between the connection 2 and the storage containers 3a, 3b

arranged. This sensor S1 can in particular be a capacitive sensor which has a high sensitivity when determining a Has liquid.

By measuring the composition of the first premix 10, the proportion of binder in the first premix 10 can be determined directly and thus it can be determined whether the composition ordered actually corresponds to the quantities delivered. In particular, it is possible to create a log of the entire delivery of the first premix 10, which in particular means that an examination of this can be dispensed with.

The distribution of the first premix 10 to the storage containers 3a, 3b can depend on various factors, for example the filling level of the individual storage containers 3a, 3b or also on that measured with the sensor S1

Composition of the first premix 10.

A second premix 11 is usually continuously conveyed via a pump 4 from the storage containers 3a, 3b, which is used for the intermediate storage of the premix of binder with liquid, which is fed to a feed device 6 to complete the final binder mixture 12.

The composition of the second premix 11 can be identical to the first premix 10. Usually, however, there is a mixture of different first premixes 10 in a tank, so that the composition of binder and liquid of the second premix 11 can vary.

One or more liquids 13, for example water or solutions mixed with water, can be fed to the second premix 11 in the feed device 6. In addition, there is also the possibility of adding additives 14 in the feed device, for example dyes.

In the supply of the liquid 13 in particular in the supply device depends on the proportion of binder in the second premix 11 and the desired one

Binder content in the binder mixture 12 from. For this purpose, a sensor S2 can be arranged upstream or downstream of the pump 4 and upstream of the feed device 6, by means of which the composition of the second premix can be determined. Based The supply of liquid 13 in the supply device 6 can be controlled accordingly to this measurement in order to achieve a corresponding binder mixture 12.

As an alternative or in addition, a sensor S3 can also be arranged after the feed device 6, by means of which the proportion of binder in the binder mixture 12 can be determined. If no sensor S2 is arranged in front of the feed device 6, the feed of liquid 13 and / or additives 14 for the completion of the binder mixture 12 in the feed device 6 can be regulated via the sensor S3. If both a sensor S2 and a sensor S3 are arranged, the binder mixture 12 can be produced correspondingly more precisely and its

Composition are constantly monitored.

The binder mixture 12 should in particular have a binder content, which can also be referred to as the solid resin content, of at least 40%, but less than 65%; the binder mixture 12 particularly preferably has a binder content between 50% and 60%.

The finished binder mixture 12 is fed into a mixing station 5, in which it is mixed with the material 8 to be wetted, in particular with chips or fibers. The material 8 wetted with the binder mixture 12 is then finally discharged from the mixing station 5 as a glued material 9 and fed to the pressing process to form a material panel.

In Figure 2, a system 20 for the production of material panels is shown schematically. The system 20 includes a device 1 for producing a

Binder mix 12 as set out above. The binder mixture 12 is fed to a mixing station 5 in which the binder mixture 12 is mixed with a material 8. The material 8 can in particular be chips or fibers, preferably those made of lignocellulose-containing material. The mixing station 5 can, for example, be designed as a static mixer in which the binder mixture 12 is sprayed onto the material 8 and moved along a helical line to an exit. Alternatively, the mixing station 5 can also be designed as a chute, in which on a curtain made of the material 8 the Binder mixture 12 is sprayed.

At the exit of the mixing station 5, at the end of the mixing process, there is a glued material 9, which is fed to a scattering station 21 and there on a

Forming tape, in particular continuously, is applied in the form of a mat. The glued material 9, which has been scattered to form a mat, is fed via the forming belt to a press 22, in particular a continuously operating press 22, where it is finally pressed into sheets of material.

Both the device 1 for producing a binder mixture 12 as well as the mixing station 5, the scattering station 21 and the press 22 can have a

Control device 23 be connected. By means of the control device 23, on the one hand, the data from the sensors S1, S2 and S3 can be recorded and stored; on the other hand, the supply of liquid 13 and / or additives 14 in the supply device 6 can also be controlled or regulated in order to achieve a certain binder mixture 12 . Furthermore, the amount of material 8 entering the mixing station 5 can also be changed via the control device 23, so that the material 8 can be adapted accordingly to the amount of supplied binder mixture 12.

List of Reference Numbers P1603WQ:

1 device

2 connection

3a, 3b storage container

4 pump

5 mixing station

6 feeding device

7th

8 material

9 glued material

10 first premix 1 1 second premix 12 binder mixture

13 liquid

14 additives

20 plant

21 spreading station

22 press

23 Control device

S sensor

Claims

1. Device (1) for producing a binder mixture (12) in the course of

Production of material panels, the binder mixture (12) comprising at least one binder and a liquid,

with at least one storage container (3a, 3b) in which a first premix

(10) is supplied from binding agent and liquid and stored temporarily, with at least one pump (4) which is arranged after the storage container (3a, 3b) and conveys a second premix (11) from the at least one storage container (3a, 3b), and

with a feed device (6), which is arranged after the pump (4), for feeding a further liquid (13) to the second premix (11) for producing the binder mixture (12),

characterized in that before and / or after the at least one storage container (3a, 3b) at least one sensor (S1, S2, S3) for determining the proportion of binder in the first premix (10) and / or second premix

(11) and / or the binder mixture (12) is arranged.

2. Device (1) according to claim 1, characterized in that the at least one sensor (S1, S2, S3) is a capacitive sensor.

3. Device (1) according to one of the preceding claims, characterized

characterized in that the at least one sensor (S1, S2, S3) is arranged before and / or after the pump (4) and / or the supply device (6).

4. Device (1) according to one of the preceding claims, characterized

characterized in that the binder is glue and / or that the liquid (13) is water and / or that the binder component is the solid resin component.

5. Device (1) according to one of the preceding claims, characterized

characterized in that a control device (23) is arranged which controls or regulates the pump (4) and / or feed device (6) in such a way that the binder mixture (12) does not have a predetermined proportion of binder

falls below.

6. Device (1) according to one of the preceding claims, characterized

characterized in that the binder mixture (12) has a binder content of 40% to 65%, preferably 45% to 60%, particularly preferably 50% to 60%.

7. Device (1) according to one of the preceding claims, characterized

characterized in that the measurement of the binder content of the first

Premix (10) and / or second premix (11) and / or the

Binder mixture (12) takes place continuously.

8. Device (1) according to one of the preceding claims, characterized

characterized in that a protocol with the control device (23)

Parameters of the first premix (10) and / or second premix (11) and / or the binder mixture (12) can be displayed or output.

9. Plant (20) for the production of material panels, comprising

a device (1) according to one of the preceding claims 1 to 8, a mixing station (5) for mixing a material (8), in particular

lignocellulose-containing material, with the binder mixture (12) for producing a glued material (9),

a scattering station (21) for scattering the glued material onto a forming belt, and a press (22) for pressing the glued material (9) into one

Material plate.

10. A method for producing a binder mixture (12) in the course of production of material panels, the binder mixture (12) at least one

Comprises binder content and a liquid,

wherein a first premix (10) of binding agent and at least one liquid is fed to a storage container (3a, 3b) and is temporarily stored there, with a second premix (11) of binding agent and at least one

Liquid (13) is removed from the storage container (3a, 3b) by means of a pump (4) and this second premix (11) is supplied with a further liquid (13) for producing the binding agent mixture (12)

characterized in that the binder content in the first premix (10) and / or second premix (11) and / or the binder mixture (12) is determined via a sensor (S1, S2, S3).

11. The method according to claim 10, characterized in that the supply of liquid (13) to the second premix (11) for producing the

Binder mixture (12) is controlled or regulated via a control device (23) in such a way that the binder mixture (12) has a predetermined

Does not fall below the binder content.

12. The method according to claim 10 or 11, characterized in that the

Binder mixture (12) has a binder content of 40% to 65%, preferably 45% to 60%, particularly preferably 50% to 60%.

13. The method according to any one of claims 10 to 12, characterized in that additives (14), in particular color solutions and / or hardener solutions, are added to the second premix (11) in the feed device (6).

14. The method according to any one of claims 10 to 13, characterized in that during and / or after the measurement parameters, in particular the proportion of binder and / or proportion of liquid, of the first premix (10) and / or second

Premix (11) and / or the binder mixture (12) can be determined and recorded.