Method for producing OSB panel and OSB panel production device

Abstract

The invention relates to a method for producing an oriented structure shaving board (44), comprising the following steps: producing coarse chips (20); applying a flame retardant solution (28) to the coarse chips (20); subsequently removing the flame retardant solution (28) from the crumb (20), in particular by applying a pressure difference, thereby obtaining a flame retardant-containing crumb (32); subsequently gluing the flame retardant-containing crumbs (32), thereby obtaining glued crumbs (20); and pressing the coarse chips (20), thereby obtaining the oriented structure shaving board (44).

Description

Technical Field

[0001] The invention relates to a method for producing OSB panels (Oriented Strand Boards), which can also be referred to as chipboards. According to a second aspect, the invention relates to an OSB panel production device, which has: (a) a chip production device for producing chips from wood, (b) a dryer for drying the chips, which is connected to the chip production device, (c) a distribution device for distributing the chips, thereby producing a chip layer, and (d) a belt conveyor, which is arranged downstream of the dryer in the direction of the material flow and for conveying the chip layer. The OSB panel production device can also be referred to as a chipboard production device. Background Art

[0002] Since flame retardants represent a considerable expense, it is advantageous to use as little as possible during the manufacture of flame retardant OSB panels. One reason for this is that the flame retardants themselves are expensive. Additionally, flame retardancy means that more adhesive must be used to obtain the same mechanical strength as non-flame retardant OSB panels, which is also undesirable. Additionally, most flame retardants are not easily soluble in water, so that introducing flame retardants into the coarse chips also means introducing large amounts of water, which must be removed during further processing.

[0003] US2003 / 0059638 A1 discloses a method for producing OSB panels, wherein a flame retardant is first applied to coarse chips by spraying or dipping. A vacuum or overpressure is subsequently applied in a vacuum chamber or pressure chamber in order to incorporate the flame retardant into the coarse chips. In a further step, the cellulosic material is treated with gaseous carbon dioxide. The moist cellulosic material treated in this way is coated with pulverized protein, such as soy flour, and pressed to form cellulosic products, such as plywood and chipboard.

[0004] WO 03 / 099533 A1 describes a method in which large chips are first produced, which are impregnated with a flame retardant by means of an alternating pressure impregnation or vacuum pressure process. The large chips produced in this way are then processed into coarse chips, which are then processed to produce OSB panels.

[0005] EP 2 241 426 A1 relates to a method for producing a panel made of wood material, wherein a fiber cake made of wood fibers or wood chips is first produced and compressed with the aid of a pre-press. A vacuum is applied to one side of the fiber cake and an impregnation medium is applied from the other side, the vacuum causing the impregnation medium to be distributed in the fiber cake.

[0006] US 6 146 766 describes a vacuum pressure process in which a sodium silicate / sodium borate mixture is used. The mixture is subsequently polymerized by applying heat. Summary of the invention

[0007] The object of the present invention is to improve the production of flame retardant OSB panels.

[0008] The present invention achieves this object by a method for producing an OSB panel, the method comprising the steps of: (a) producing coarse chips, (b) applying a flame retardant solution to the coarse chips, (c) applying a pressure difference to the coarse chips to introduce the flame retardant solution into the coarse chips, thereby producing coarse chips containing the flame retardant, (d) gluing the coarse chips containing the flame retardant, thereby producing glued coarse chips, and (e) pressing the glued coarse chips, thereby producing an OSB panel.

[0009] The invention also achieves the object by a method for producing an OSB panel, the method comprising the steps of: (a) producing chips, (b) applying a fire retardant solution to the chips, (c) subsequently removing the fire retardant solution from the chips, in particular by applying a pressure difference to the chips, thereby producing chips containing the fire retardant, (d) gluing the chips containing the fire retardant, thereby producing glued chips, and (e) pressing the glued chips, thereby producing an OSB panel.

[0010] According to a second aspect, the invention achieves the object by a production device according to such OSB panels, comprising a fire retardant solution application device arranged to apply a fire retardant solution to the coarse chip layer, and a pressure difference generator for applying a pressure difference to the coarse chip layer.

[0011] The invention has the advantage that the consumption of flame retardant can generally be reduced compared to conventionally produced OSB panels. Due to the pressure difference applied to the coarse chips, the flame retardant solution is at least partially absorbed into the coarse chips, or excess flame retardant solution is removed. As a result, less flame retardant skin is formed on the coarse chips. Such skin can easily be rubbed off during further processing, in particular during mechanical transportation and spreading, and would lead to a loss of flame retardant.

[0012] Another advantage is that by applying a pressure difference, the fire retardant solution can be sucked and / or pressed into the coarse chips. According to a preferred embodiment, the fire retardant solution present on the coarse chips can then be removed, for example by suction or centrifugation. This means that less water is introduced into the coarse chips compared to known methods. Consequently, less water has to be removed during further processing of the coarse chips compared to known OSB panel production methods.

[0013] However, the flame retardant solution can also penetrate into the coarse chips without the support of an overpressure or underpressure. The flame retardant solution is then removed from the coarse chips, for example, by applying a pressure difference.

[0014] The feature of removing any fire retardant solution on the chips is particularly understood to mean that the fire retardant that has penetrated into the chips is not removed. It has been found that the increase in fire resistance is mainly due to the penetration of the fire retardant into the chips, while the fire retardant remaining on the surface of the chips mainly leads to an increased consumption of the adhesive. Applying the fire retardant solution to the dry chips ensures that the fire retardant penetrates into the interior of the chips. This does not require a vacuum. The subsequent removal of the fire retardant solution on the chips prevents excessive consumption of the adhesive.

[0015] Preferably, but not necessarily, the pressure difference of the flame retardant solvent is applied at separate times and / or locations. Preferably, the time interval is at least 1 second, in particular at least 5 seconds. The interval is usually at most one week.

[0016] The feature of removing the flame retardant solution from the coarse chips is particularly understood to mean that the flame retardant solution found on the surface of the coarse chips is at least partially removed. Preferably, any flame retardant solution that has penetrated into the coarse chips is not removed or is removed only to a small extent, for example at most 10% by weight.

[0017] In addition, it is generally advantageous that, due to the optional absorption and / or pressing of the flame retardant solution into the coarse chips, less chemical reaction occurs with the binder. Therefore, the amount of binder that must usually be added here is significantly less to compensate for the moisture loss caused by the addition of the flame retardant.

[0018] If, as is contemplated according to a preferred embodiment of the invention, the flame retardant solution which is removed, blown out and / or sucked out and / or centrifuged from the coarse chips when the pressure difference is applied is reapplied to the coarse chips, the amount of flame retardant solution which is not introduced into the OSB panel is also reduced. Preferably, the removal takes place after the application of the flame retardant solution, but not simultaneously. This is to be understood in particular as meaning that once the flame retardant solution has been applied, the pressure difference is only applied to at least a large part, in particular at least 80% by weight, particularly preferably at least 90% by weight, of the coarse chips. Particularly preferably, the location where the flame retardant solution is applied to the coarse chips is spaced apart from the location where the pressure difference is applied. The distance is preferably at least 10 cm, in particular at least 1 m. The distance is preferably at most 100 m.

[0019] It is advantageous to purify the fire retardant solution removed, in particular blown out and / or sucked out, from the coarse chips when applying the pressure difference before re-application, for example by filtering and / or centrifuging. For example, in this way, any wood components are separated from the fire retardant solution.

[0020] In the context of this description, coarse chips are understood to be wood chips having a size range of 200±30 cm×20±4 cm×0.5±0.2 cm.

[0021] In particular, the method according to the invention is a method for producing flame-retardant OSB panels which are flame-retardant in accordance with DIN EN 13823 (single fire test) and / or according to DIN EN 13501-1.

[0022] The flame retardant solution is preferably an aqueous solution. The flame retardant solution preferably comprises at least one organic or inorganic compound containing phosphorus and / or nitrogen. According to one embodiment, the flame retardant is an inorganic salt.

[0023] Applying the flame retardant solution to the coarse chips is understood in particular to mean spraying or spraying.

[0024] According to a first embodiment, applying a pressure difference to the chip is understood to mean generating a pressure difference between a first lateral surface of the chip and an opposite lateral surface of the chip. The two lateral surfaces are spaced from each other by the height of the chip, ie 0.5±0.2 cm.

[0025] According to a second embodiment, applying a pressure difference to the coarse chips is understood to mean applying a pressure to the coarse chips, in particular to the coarse chip layer, which pressure differs from the ambient pressure, in particular by at least 200 hPa, preferably at least 400 hPa, particularly preferably at least 600 hPa. The pressure may be an overpressure or a negative pressure.

[0026] The feature of pressing the coarse chips to obtain the OSB panel is particularly understood to mean pressing at least the coarse chips. In particular, additional chips other than coarse chips can also be pressed together with the coarse chips. In addition, as a preferred embodiment, a first surface layer and a second surface layer made of coarse chips can be spread, the first surface layer and the second surface layer and an intermediate layer arranged between the two surface layers can be pressed together to form an OSB layer.

[0027] The feature of applying the flame retardant solution to the coarse chips is particularly understood to mean that the coarse chips are not in a pressed form when the flame retardant solution is applied. In other words, the flame retardant solution is applied to the coarse chips which are not pressed.

[0028] The gluing is preferably carried out without a pressure difference acting on the coarse chips.

[0029] According to a preferred embodiment, the method comprises the steps of (a) arranging the coarse chips on a conveyor belt, thereby producing a coarse chip layer, and (b) applying a flame retardant solution to the coarse chip layer. In this way, the coarse chips can be wetted quickly, evenly and reliably with the flame retardant solution.

[0030] Preferably, the pressure difference applied to the coarse chips moistened with the flame retardant solution is a negative pressure applied to the underside of the conveyor belt. For this purpose, the conveyor belt is permeable to gas. For example, the conveyor belt is perforated or made of a gas-permeable material, such as fabric. Alternatively, the conveyor belt can be a metal belt. The metal belt is preferably perforated.

[0031] Alternatively or additionally, applying a pressure difference to the coarse chips moistened with the flame retardant solution is applying an overpressure to the upper side of the coarse chip layer. This is achieved, for example, by the coarse chip layer first passing through a roller acting as a seal and then entering an overpressure area where the overpressure is applied. The coarse chip layer is located on the air-permeable conveyor belt, with a low pressure (such as ambient pressure or negative pressure) acting on the side facing away from the overpressure area. The coarse chip layer leaves the overpressure area by passing through the roller acting as a seal.

[0032] The method for producing the chips preferably comprises drying the chips. In other words, the chips are dried before the flame retardant solution is applied. The drying can take place on the same conveyor belt as the flame retardant solution is applied and, where appropriate, on the same conveyor belt as the pressure difference is applied; however, this is not required. The chips are preferably dried until they are dehydrated and dry. In this state, the flame retardant solution can be absorbed particularly quickly and easily by the dried chips.

[0033] According to a preferred embodiment, the chips containing the flame retardant are substantially not dried. This is understood to mean that the water content of the chips containing the flame retardant solution varies by at most 5%, in particular at most 2%, before and / or after gluing and before pressing.

[0034] Alternatively, the coarse chips containing the flame retardant solution are dried. This is achieved, for example, by using a belt dryer. Preferably, the coarse chips containing the flame retardant solution are dried at a temperature of at least 50°, in particular at least 55° and / or at most 100°, in particular at most 90°, particularly preferably at most 85°. The coarse chips containing the flame retardant solution are dried in particular until the residual moisture is at most 9% by weight, in particular at most 8% by weight, particularly preferably at most 10% by weight, in particular at most 9% by weight, particularly preferably at most 8% by weight.

[0035] Preferably, the coarse chip layer thickness corresponds to at most four times, preferably at most three times, preferably at most two times, the coarse chip layer thickness of a single coarse chip layer. The coarse chip layer thickness is the minimum possible thickness of the coarse chip layer. This is the thickness of the coarse chip layer at 1 m. 2 The invention relates to an arrangement of coarse chips on a flat horizontal test surface of the invention, wherein for said arrangement segments of two or more coarse chips overlap over at most 75% of the test surface and wherein at least 90%, preferably at least 95%, in particular 100% of the test surface is covered by coarse chips.

[0036] When applied to the coarse chip layer, the flame retardant solution preferably has a temperature of at least 50° C., preferably at least 60° C., and especially at least 70° C. High temperatures generally increase the solubility of the flame retardant in the solvent, so that less solvent (usually water) is required to dissolve a given amount of flame retardant. In addition, the viscosity of water decreases with increasing temperature, so that the flame retardant solution can more easily penetrate into the coarse chip.

[0037] Advantageously, the flame retardant concentration of the flame retardant solution corresponds to at least 60%, in particular at least 70%, preferably at least 80%, particularly preferably at least 90% of the maximum solubility of the flame retardant.

[0038] Advantageously, the flame retardant solution contains the flame retardant in a concentration of 30% by weight, in particular at least 40% by weight, preferably at least 45% by weight.

[0039] According to one embodiment, at least 18 wt.-%, in particular at least 20 wt.-%, preferably at least 22 wt.-% of flame retardant is applied to the coarse chips. In other words, at least 18 g of flame retardant is applied to 100 g of coarse chips. Similarly, at most 30 wt.-%, in particular at most 28 wt.-%, preferably at most 26 wt.-% of flame retardant is applied to the coarse chips. These figures refer to the flame retardant in the flame retardant solution and are independent of the amount of solvent.

[0040] The flame retardant solution preferably contains a viscosity reducer. Alternatively or additionally, the flame retardant solution preferably contains a surfactant. This improves the wetting of the coarse chips.

[0041] Advantageously, the method comprises the steps of: (a) producing coarse chips and middle chips, (b) jointly drying the coarse chips and middle chips, (c) separating the coarse chips and middle chips, (d) applying a flame retardant solution, in particular to the coarse chips, preferably only to the coarse chips, (e) producing a first surface layer and a second surface layer from the coarse chips containing the flame retardant and also producing an intermediate layer from at least the middle chips, and (f) pressing the first surface layer, the second surface layer and the intermediate layer to form an OSB panel. This results in an OSB panel that is flame retardant on the one hand and does not contain more flame retardant than required on the other hand.

[0042] The flame retardant solution preferably contains a colorant. The colorant is preferably colorless in the visible light range. In this case, the colorant can also be referred to as a marker. Advantageously, the colorant absorbs and / or fluoresces in the UV range. In this case, the flame retardant distribution of the flame retardant solution and / or the flame retardant can be detected by irradiating the coarse chip layer and / or the OSB board with UV light and / or recording an image of the coarse chip layer and / or the OSB board with a camera that is sensitive in the UV range. According to a preferred embodiment, the flame retardant distribution can then be used to control a process parameter in the form of a conveyor belt speed and / or a pressure difference of the conveyor belt and / or a region-specific application amount of the flame retardant solution. In other words, the deviation between the target flame retardant distribution and the measured actual flame retardant distribution is determined and at least one of the above parameters is controlled in such a way that the deviation is minimized.

[0043] The OSB panel production device according to the present invention preferably comprises an inspection system for detecting the distribution of the flame retardant in the coarse chip layer. This may refer to the distribution of the flame retardant in the surface of the coarse chip layer, i.e., the two-dimensional distribution in the longitudinal direction and the width direction of the coarse chip layer, rather than the distribution in the thickness direction.

[0044] Alternatively or additionally, the inspection system may be designed to detect the distribution of the flame retardant in the OSB panel. This may refer to the distribution of the flame retardant in the surface of the OSB panel, i.e. a two-dimensional distribution in the longitudinal direction and width direction of the coarse chip layer and / or a distribution of the flame retardant in the thickness direction.

[0045] The inspection system preferably has a camera for detecting UV light and / or fluorescence occurring when the coarse chip layer or OSB panel is irradiated with UV light.Preferably, the inspection system also has a UV light source for irradiating the coarse chip layer or OSB panel with UV light.

[0046] The chip production device preferably comprises a chipper, by means of which the chips are produced from the wood.

[0047] The pressure difference generator preferably comprises a negative pressure pump and at least one suction chamber, preferably at least two suction chambers, in particular a plurality of suction chambers, each suction chamber being connected to the negative pressure pump via a valve. The valve is preferably designed to increase the valve opening as the pressure in the suction chamber decreases. In other words, the greater the valve opening, the lower the pressure in the corresponding suction chamber.

[0048] The suction chambers are preferably arranged in such a way that at least 90% of the surface of the coarse chip single layer, preferably at least 95% of the surface, particularly preferably 100% of the surface can each be subjected to a pressure difference (in the present case, a negative pressure) for at least a predetermined time, for example 1 second, for example, in particular at least 5 seconds, via at least one suction chamber.

[0049] The negative pressure is preferably at least 300 hPa (which corresponds to an absolute pressure of 713 hPa), in particular at least 500 hPa (which corresponds to an absolute pressure of 513 hPa under standard conditions).

[0050] Preferably, the sections are designed to apply different negative pressures. In particular, the pressures in at least two sections differ by at least 30 hPa. The greater the negative pressure, the more efficiently the flame retardant that is not absorbed by the coarse chips can be sucked away. However, the greater the negative pressure, the greater the power required. Therefore, it may be advantageous to first suck out most of the excess flame retardant with a lower negative pressure and then suck out the remaining flame retardant with a higher negative pressure.

[0051] Preferably, the OSB panel production device according to the invention preferably comprises a distribution device, which can also be referred to as a homogenizer, and by means of which a uniform distribution of the coarse chips over the width of the transport chips is set. For example, the distribution device has a trimming device

[0052] The OSB panel production device preferably has an application chamber in which the flame retardant is applied to the coarse chips. Advantageously, a lock is arranged upstream of the application chamber in the direction of the material flow.

[0053] The OSB panel production device preferably has a gluing unit for gluing the coarse chips. The gluing unit, which can also be referred to as a gluing device, is preferably designed to glue the coarse chips with PDMI (polymeric diphenylmethane diisocyanate). For this purpose, the gluing unit has, for example, a gluing tank containing PDMI. For example, the coarse chips containing flame retardant are glued with 4±0.5 wt. %, in particular 4±0.25 wt. % PDMI.

[0054] The produced OSB panels preferably correspond to building material class B according to the SBI test DIN EN 13823. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In the following, the invention will be explained in more detail with the aid of the accompanying drawings. The accompanying drawings show:

[0056] Figure 1 a schematic diagram showing an OSB panel production device according to the invention for carrying out the method according to the invention, and

[0057] Figure 2 Show according to Figure 1 Schematic detailed view of an OSB panel production plant. DETAILED DESCRIPTION

[0058] Figure 1 Schematically depicted is an OSB panel production device 10 according to the invention, comprising a coarse chip production device 12. The coarse chip production device 12 comprises a debarking unit 14 for debarking wood 16, a coarse chipper 16 arranged downstream of the debarking unit 14 in the material flow direction M, and a dryer 18 arranged downstream of the chipper in the material flow direction M. Thus, the coarse chip production device 12 produces coarse chips 20.i (i=1, 2, 3, ...).

[0059] The coarse chips 20.i produced in this way are spread on a belt conveyor 24 by a schematically depicted distribution device 21 to form a coarse chip layer 22 and are moistened with a flame retardant solution 28 by a flame retardant solution application device 26. A pressure difference is then applied to the coarse chip layer 22 by a pressure difference generator 30, so that the flame retardant solution 28 penetrates into the coarse chips 20.i. This produces coarse chips 32.i containing flame retardant, which have less flame retardant on their surface.

[0060] The glue is applied to the coarse chips 32.i containing the flame retardant by means of a glue device 33. The glue device 33 may be, for example, a mixer or a coil, ie a rotating drum.

[0061] The glued coarse chips 31.i are spread by a first spreading head 34.1 to form a first surface layer 36.1. An intermediate layer 40 is spread on the first surface layer 20.1 by an intermediate layer spreader 38. A second spreading head 34.2 is used to spread a second surface layer 36.2 on the intermediate layer 40. The layers 36.1, 40, 36.2 are pressed by a hot press 42 to form an OSB panel 44.

[0062] The intermediate layer spreader 38 spreads the intermediate layer chips 46.i which are produced by the intermediate layer production device or separated from the coarse chips 20.i by screening through (in this case) the classifier 48. The intermediate layer chips 46.i are subsequently glued in the second gluing unit 50 and then transported to the intermediate layer spreader 38.

[0063] The fire retardant solution 28 removed from the coarse chips 20 when a pressure differential is applied to the coarse chips 20 is returned to the reservoir 50 by a return device (e.g., return line 88). The return line 88 may include a filter 90 through which small pieces of wood are removed. In addition, the return line preferably includes a pump for pumping the fire retardant solution.

[0064] Figure 2 The dispensing device 21, the flame retardant solution application device 26 and the pressure difference generator 30 are shown. The flame retardant solution application device 26 includes a reservoir 50 containing the flame retardant solution 28. The flame retardant solution 28 can be heated to a given temperature T by a heater 52. 28 , where for example 50℃≤T 28 ≤95° C. The flame retardant solution 28 is conducted by means of a metering pump 54 to nozzles 56 . k which are arranged next to one another transversely to the material flow direction M and are sprayed from the nozzles onto the coarse chip layer 22 .

[0065] The pressure difference generator 30 has a negative pressure pump 58 connected to a plurality of suction chambers 60.j (j=1, 2, ...). Therefore, during the operation of the negative pressure pump 58, for example, 100 hPa ≤ p j Pressure p ≤ 800hPaj Acting on the suction chamber 60.j. In this case, the pressures in the individual suction chambers 60.j may be different from each other.

[0066] The suction chamber 60.j rests on a conveyor belt 62 of the belt conveyor 24, which has openings, such as holes. Thus, a pressure p is applied to the coarse chip layer 22. j .

[0067] The pressure differential generator 30 may include a perforated metal strip 64, but this is not required. Figure 2 As shown, the perforated metal belt is pressed from above onto the coarse chip layer 22. For example, pressure rollers 66.1, 66.2 are provided for this purpose. The suction chamber 60.j rests on the metal belt 64 on the side of the metal belt 64 facing away from the coarse chip layer 22. Thus, in the region of the pressure chamber 60.j, a pressure of, for example, 100 hPa ≤ p is introduced into the coarse chip layer 22. 22 Pressure p ≤ 800hPa 22 .

[0068] The pressure difference generator 30 may also include two sets of suction chambers 60.j and 60'.j, but this is not necessary. Figure 2 As shown, the coarse chip layer 22 is arranged between the two groups of suction chambers. The second group of suction chambers 60'.j can be connected to a second pump 68, but this is not required. The second pump 68 can be a vacuum pump or a pressure pump.

[0069] The pressure p in the first group of suction chambers 60.j j It can be an overpressure and the pressure p' in the second set of pumping chambers 60'.j j It can be overpressure, but it is not required.

[0070] Alternatively, p j It can be an overpressure and the pressure p' j It can be negative pressure.

[0071] As yet another alternative, p j It can be negative pressure and pressure p' j It can be negative pressure.

[0072] As yet another alternative, p j It can be negative pressure and pressure p' j It could be overvoltage.

[0073] An inspection system 70 can be arranged downstream of the pressure difference generator 30 in the material flow direction M, the system comprising a camera 72. The camera 72 detects light emitted or not absorbed by the colorant in the flame retardant solution. Alternatively or additionally, the camera 72 detects fluorescence. In this way, the actual flame retardant distribution k is determined. ist(x, y), which represents the flame retardant concentration k as a function of the surface coordinates x, y. The controller 74 calculates the actual flame retardant distribution k ist (x, y) and target flame retardant distribution k soll (x, y) and individually control the nozzle 56.k so that the actual flame retardant distribution k ist (x, y) and target flame retardant distribution k soll The deviation between (x, y) is minimized.

[0074] The inspection system may, but is not required to, have a UV light source that illuminates the coarse chip layer 22 in the field of view G of the camera 72. The field of view G is the area of ​​the coarse chip layer 22 that is captured using the camera 72. Figure 1 , for the sake of clarity, the inspection system 70 is not depicted.

[0075] Figure 1 It is shown that a cutting device 78 can be arranged downstream of the hot press 42 in the direction of the material flow, wherein said device cuts the OSB panel 44 into individual panel sections 80.1. In this case, it is advantageous to arrange a second inspection system 82, whose camera 84 captures the cut surface 86 of the respective panel section 80.1. This is used to determine the second actual flame retardant distribution k ist,2 (y, z), the second actual flame retardant distribution also expresses the depth dependence of the flame retardant concentration k. In other words, the second actual flame retardant distribution k ist,2 (y, z) expresses the depth gradient of the colorant.

[0076] The controller 74 is configured to modify the pressure p in at least one suction chamber 60.j j and / or the conveyor belt speed v of the conveyor belt 62 62 , so that the second actual flame retardant distribution k ist,2 (y, z) is close to the second target flame retardant distribution k soll,2 (y, z).

[0077] Reference numerals list

[0078] 10 OSB panel production plant

[0079] 12 Coarse Chip Production Device

[0080] 14 peeling units

[0081] 16 Wood

[0082] 18. Dryer

[0083] 20 coarse crumbs

[0084] 21 Distribution device

[0085] 22 Coarse chip layer

[0086] 24 Belt conveyor

[0087] 26 Flame retardant solution application device

[0088] 28 Flame retardant solution

[0089] 30 Pressure difference generator

[0090] 32 Coarse chips containing flame retardant

[0091] 33 Gluing device

[0092] 34 Spreading head

[0093] 36 Surface layer

[0094] 38 Intermediate layer spreader

[0095] 40 Middle Layer

[0096] 42. Heat Press

[0097] 44 OSB Panel

[0098] 46 Middle chips

[0099] 48 Classifier

[0100] 50 Storage

[0101] 52 Heater

[0102] 54 Metering Pump

[0103] 56 Nozzle

[0104] 58 Negative pressure pump

[0105] 60 Suction chamber

[0106] 62 conveyor belt

[0107] 64 Metal Strip

[0108] 66 Pressure roller

[0109] 68 Second Pump

[0110] 70 Check system

[0111] 72 Camera

[0112] 74 Controller

[0113] 76 UV light source

[0114] 78 Cutting device

[0115] 80 Panel Segments

[0116] 82 Second Inspection System

[0117] 84 Second Camera

[0118] 86 Cutting Surface

[0119] 88 Return line

[0120] 90 Filters

[0121] i Run index

[0122] j Run index

[0123] k concentration

[0124] k ist (x, y) Actual flame retardant distribution

[0125] k soll (x, y) Target flame retardant distribution

[0126] k ist,2 (y, z) Second actual flame retardant distribution

[0127] k soll,2 (y, z) Second target flame retardant distribution

[0128] M Material flow direction

[0129] p pressure.

Claims

1. A method for producing an OSB panel (44), comprising the following steps: (a) producing coarse chips (20), (b) applying a flame retardant solution (28) to the coarse chips (20), (c) subsequently removing the flame retardant solution (28) from the coarse chips (20), in particular by applying a pressure differential, thereby producing coarse chips (32) containing the flame retardant, (d) then applying a glue to the flame retardant containing chips (32), thereby obtaining glued chips (20), and (e) Pressing the coarse chips (20), thereby obtaining the OSB panels (44).

2. The method according to claim 1, characterized by the following steps: (a) arranging the coarse chips (20) on a conveyor belt (62) to produce a coarse chip layer (22), and (b) applying a flame retardant solution (28) to the coarse chips (20) on the conveyor belt (62), (c) applying a pressure difference to the coarse chips (20) wetted by the flame retardant solution (28) by: applying negative pressure to the underside of the conveyor belt, and / or An overpressure is applied to the upper side of the coarse chip layer (22).

3. The method according to any one of the preceding claims, characterized in that The production of the coarse chips (20) includes drying the coarse chips (20), wherein the drying is performed before applying the flame retardant solution (28).

4. The method according to any one of the preceding claims, characterized in that The chip layer thickness of the coarse chip layer (22) corresponds to at most four times the coarse chip single layer thickness of the coarse chip single layer.

5. The method according to any one of the preceding claims, It is characterized by the following steps: Any flame retardant solution present on the chips is removed.

6. The method according to claim 5, characterized in that Removing any flame retardant solution present on the cuttings includes: (a) blowing out and / or sucking out by applying said pressure difference, and / or (b) Centrifugal separation.

7. The method according to any one of the preceding claims, characterized by the following steps: In particular, after removing the flame retardant solution present on the coarse chips, the coarse chips (32) containing the flame retardant are dried.

8. The method according to any one of the preceding claims, characterized in that The flame retardant solution (28) (a) has a temperature of at least 50° C. when applied to the coarse chip layer (22), and / or (b) Contains a viscosity reducing agent, especially a surfactant.

9. The method according to any one of the preceding claims, comprising the steps of: (a) Produce coarse and medium chips, (b) jointly drying the coarse chips and the middle chips, (c) Separate the coarse chips from the medium chips, (d) applying the flame retardant solution to the coarse chips (20), thereby obtaining coarse chips (32) containing the flame retardant, (e) producing a first surface layer (36.1) and a second surface layer (36.2) from said coarse chips (32) containing flame retardant and also producing an intermediate layer (40) from at least said intermediate chips (46), and (f) Compressing the first surface layer (36.1), the second surface layer (36.2) and the intermediate layer (40) to form the OSB panel (44).

10. The method according to any one of the preceding claims 2 to 9, characterized in that (a) the flame retardant solution (28) contains a colorant, in particular a colorant which is colorless and absorbs or fluoresces in the UV range, and (b) The method comprises the following steps: (i) a depth-dependent, in particular optical, examination of the colorant concentration of the coarse chip layer (22) and / or the OSB panel (44), thereby obtaining a colorant depth profile, and (ii) using the colorant depth profile to control the conveyor belt speed, the pressure difference and / or the area specific application amount of the flame retardant solution (28).

11. An OSB panel production device having (a) a chip production device (10) for producing chip (20) from wood (16), (b) a dryer (18) for drying the coarse chips (20), the dryer being connected to the coarse chips production device (10), (c) a distribution device (21) for distributing the coarse chips (20) to thereby obtain a coarse chip layer (22), and (d) a belt conveyor (24) arranged downstream of the dryer (18) in the direction of material flow and used to transport the coarse chip layer (22) It is characterized in that (e) a flame retardant solution application device (26) arranged to apply a flame retardant solution (28) to the coarse chip layer (22), and (f) A pressure difference generator (30) for applying a pressure difference to the coarse chip layer (22).

12. The OSB panel production device according to claim 11, characterized in that: An inspection system (70) for detecting the distribution of a fire retardant in the coarse chip layer (22) and / or the OSB panel (44), the inspection system (70) comprising: (a) a UV light source (76), and (b) A camera (72) for detecting reflected UV light and / or fluorescent light.

13. The OSB panel production device according to claim 12, characterized in that: A controller (74) is configured to use the flame retardant profile to automatically control conveyor belt speed, the pressure differential, and / or a region specific application amount of a flame retardant solution (28).

14. An OSB panel production device according to any one of the preceding claims, characterized in that The pressure difference generator comprises: (a) a negative pressure pump (58), and A plurality of suction chambers, each of which is connected to the negative pressure pump (58) via a valve, The valve has a valve opening which increases as the pressure (p) in the suction chamber (60) decreases, and / or (b) a pressure pump, and a plurality of pressure chambers, each pressure chamber being connected to the pressure pump via a valve, The valve has a valve opening that increases as the pressure (p) in the suction chamber (60) decreases.

15. The OSB panel production device according to any one of claims 12 to 14, characterized in that: A return device (88) for returning the flame retardant solution (28) removed from the coarse chips (20) by the pressure difference generator to the flame retardant solution application device (26).

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