EP2036689A1 - Wooden material board impregnating device - Google Patents

Abstract

The device (10) has a support (12) i.e. metal frame, with a bearing surface (A) for bearing of a wood-based sheet (14), and a suction device (16) for applying a negative pressure on a surface of the sheet. The suction device has a suction bar (18.1) linearly running in sections. A sealing (24) held at a side of the bar is turned towards the bearing surface. The bar forms an evacuation suction cavity (26) in the sheet. The cavity has a suction surface turned towards the sheet. An application head (42) applies a tempering liquid (40) to a tempering strip (38). An independent claim is also included for a method for manufacturing a wood-based sheet.

Description

The invention relates to a wood-based panel treatment device with a receptacle which has a support surface for supporting a wood-based panel, and a suction device for applying a negative pressure to a surface of the wood-based panel when it lies on the support surface. According to a second aspect, the invention relates to a method for producing a wood-based panel.

A generic wood material board compensation device is from the DE 199 63 203 A1 known. Such a wood board compensation device is used to provide wood-based panels in areas with a tempering liquid, such as an impregnating agent. This ensures that expensive tempering liquid is applied only in the areas on the wood-based panel in which the remuneration is necessary. From the DE 199 63 203 A1 is also known to apply a negative pressure to the plate and apply coating liquid on the opposite side, so that the negative pressure accelerates penetration of the quench liquid in the wood-based panel. However, it has been found that the annealing range of the wood-based panel impregnated with the tempering liquid changes in the thickness direction of the wood-based panel Expansion has. In cross section, the compensation area is trapezoidal. To compensate for a strip of a predetermined width, so as to obtain a compensation area with a substantially rectangular cross section, therefore, more compensation liquid must be used, as would actually be necessary.

The invention has for its object to overcome disadvantages in the prior art. The invention solves the problem by a generic wood-based panels compensation device, in which the suction is rectilinear, the suction strips are straight, on their side facing the bearing surface have seals and are designed to form an evacuated suction chamber with the superposed on the support surface wood board, which has one of the wood-based panel facing suction surface, which is a fraction of the surface of the wood-based panel.

According to a second aspect, the invention solves the problem by a method for producing a wood-based panel, comprising the steps of supporting the wood-based panel on a bearing surface of a wood-based panels compensation device according to the invention so that it forms a suction chamber with the seals, evacuating the suction chamber, so that in the suction chamber a negative pressure is produced, and a coating of tempering liquid on a compensation region of the wood-based panel opposite the suction chamber, so that the tempering liquid is drawn into the wood-based panel due to the negative pressure and thus forms a coating.

An advantage of the invention is that the wood-based panel can be coated significantly faster than with known devices. It is also advantageous that the compensation area, that is to say the area of the wood-based panel wetted by the quench liquid, is essentially cuboid and has a rectangular cross-section. It must therefore be used only as much compensation liquid as is necessary for tempering the area to be tempered. In particular, there is no rejuvenating compensation area. Another advantage is that more viscous, that is tougher tempering liquids can be used than has hitherto been possible.

In the context of the present description, the surface of the wood-based panel is understood as meaning one of the two largest of the side surfaces. This surface is separated from a second surface by a narrow surface, which may also be referred to as a peripheral edge.

Under a recording is understood in particular any device to which the wood-based panel is placed flat. The overlay can also be formed by one or more suction strips. It is convenient, but not necessary, for the bearing surface to be substantially horizontal. In principle, it is also possible to form the receptacle so that a resting on the support surface wood material plate is tilted at a predetermined angle to the horizontal.

Under a suction device is understood in particular any device with which at least a rough vacuum can be generated. Such suction devices belong to the prior art and include, for example, piston pumps.

The seals are in particular attached to the squeegee that the suction chamber is completed by them completely opposite the wood-based panel. The seals may for example consist of rubber, plastic or silicone.

In a preferred embodiment, the wood-based panel compensation apparatus comprises an application head adapted to apply a tempering liquid anneal strip having a predetermined anneal strip width. Under the compensation liquid is understood in particular any liquid that gives the wood-based panel advantageous properties. For example, the tempering liquid can have a hydrophobizing effect, increase the mechanical strength of the wood-based panel, increase its density and / or have an abrasion-resistance-increasing effect.

Particularly preferably, the suction strips have a Saugraumquerschnitt, which has a Saugraumquerschnittsfläche which is smaller than the product of a compensation strip width and 20 mm. Under the Saugraumquerschnitt the cross section through the suction chamber is understood perpendicular to the support surface and thus perpendicular to the wood material board. if, according to a preferred embodiment, the squeegee is U-shaped, then said feature corresponds to the fact that the squeegee has a depth of 20 mm. The smaller the depth, the smaller the Saugraumquerschnittsfläche, the smaller the suction chamber and the faster the suction chamber can be evacuated at a given pumping power of a vacuum pump. It is therefore particularly advantageous if the Saugraumquerschnittsfläche is smaller than the product of the remuneration strip width and 10 mm.

In order to carry out the application of the compensation liquid automatically, it is preferably provided that the application head is guided guided and formed automatically movable. The application head is designed alternatively or additively as an application strip. This application ledge is adapted to enclose with the wood-based panel a annealing area having a annealing area. The compensation range corresponds in terms of surface area and position of the suction surface. The application strip is designed so that it can be applied to the wood-based panel by means of compensation liquid, so that the coating liquid can be sucked into the panel by suction pressure applied in the suction space.

Particularly preferably, the suction chamber has a suction chamber width, which substantially corresponds to the remuneration strip width. This ensures that air is sucked through the wood-based panel in the suction chamber at exactly the points where the air flow induced in this way draws the tempering liquid into the wood-based panel.

According to a preferred embodiment, at least three suction strips are arranged in pairs parallel equidistantly next to each other. For example, a distance is then provided between the individual suction strips, which corresponds to a cutting width in a subsequent division of the wood material board in partial wood-based panels, panels or plank elements. In this way, exactly the areas can be annealed, in which runs in a subsequent processing step, a kerf.

The wood-based panel compensation device preferably comprises a vacuum pump, which is designed to generate a negative pressure in the suction space with an air pressure of less than 200 hPa, in particular less than 100 hPa. It is possible in principle to use even lower air pressures. However, the Einsauggeschwindigkeit the compensation liquid is primarily proportional to the pressure difference between the suction chamber and the environment. A reduction of the air pressure in the suction chamber below 100 hPa thus only slightly increases the suction speed. At the same time the effort increases to obtain lower air pressures. The optimum air pressure thus results as the optimum between the highest possible Einsauggeschwindigkeit one hand and the least possible effort to generate the vacuum on the other.

Preferably, the wood panel compensation device comprises a plurality of vacuum valves associated with individual squeegees or groups of squeegees with which the individual squeegees or groups of squeegees can be individually connected to a vacuum source such as the vacuum pump. In this way, only those suction bars must be evacuated, on the opposite side of the coating liquid to be applied.

If the receptacle for the wood-based panel is not formed from the suction, it may preferably be provided that the squeegee are mounted so movable relative to the receptacle that a deformation of the seals due to the negative pressure leads to a movement of the suction on the wood-based panel. In other words, the suction strips are sucked to the wood material board, whereby the sealing effect of the seals increases.

It has been found that seals with a hardness of 30 to 70 Shore A are particularly suitable.

Particularly preferably, the compensation liquid is applied without pressure and the application head is designed accordingly for pressure-free application of the compensation liquid. It is also preferred to apply a hydrophilic coating liquid. The tempering liquid may be formed, for example, electrical To change properties such as the electrical resistance of the wood-based panel, mechanical properties, such as the transverse tensile strength, hygrische properties, such as the water absorption or swelling, or change the emissions properties of the wood-based panel. But it can also be used hydrophobic tempering liquids.

The invention solves the problem also by a wood-based panel treatment device with a receptacle having a support surface for supporting a wood-based panel, and a suction device for applying a negative pressure on a surface of the wood-based panel, which lies on the support surface, wherein the receptacle a plurality of at least partially rectilinear Has running channels and wherein the channels open into the support surface and are formed to form with a deposited on the support surface wood material panel the evacuable suction chamber having a the wood-based panel facing suction surface.

The advantage of this is that moving elements such as suctions are dispensable. Thus, the receptacle can be free of sealing elements so that a resting on the recording wood-based panel comes into contact only with elements that have a hardness that is at least as great as the hardness of the wood-based panel. A sliding of the wood-based panel on the recording then leads to a negligible wear on the recording.

Particularly preferably, the wood material board compensation device comprises a frame for receiving the receptacle and at least two receptacles which differ in arrangement of the channels and each comprise at least one vacuum port for connecting the channels to a vacuum pump, wherein the vacuum connections are arranged in the same position in the operating position. The frame is preferably arranged so that in each case exactly one of the receptacles can be arranged on the frame. The vacuum pump connection for connecting the channels of the receptacles to the vacuum pump is preferably positioned on the frame such that mounting the receptacle on the frame automatically causes the vacuum connection to be so close to a suction point of the vacuum Vacuum pump is that forms either immediately a connection or the distance between the Saugstellenvakuumpumpe and the vacuum pump connection is so small that it is easily bridged with a coupling piece, such as a clamp. The advantage of this is that the recordings can be changed quickly if the remuneration is to be introduced at another location.

Particularly preferably, the vacuum pump ports of the receptacles are arranged so that they are adjacent in the operating position of the vacuum pump. In particular, the vacuum pump ports of the receptacle are arranged so that they come to rest less than 1 m from the vacuum pump. It is particularly favorable if the vacuum connections are arranged such that placing the receptacle on the frame results in a plug connection being formed between the respective vacuum pump connection and the suction point of the vacuum pump.

It is particularly favorable if the channels have a width of less than 50 mm. It has been shown that the achievable vacuum strongly depends on how large the vacuum chamber to be evacuated.

Figur 1

eine schematische Ansicht einer erfindungsgemäßen Holzwerkstoffplattenvergütungsvorrichtung,

Figur 2

eine schematische Ansicht von Saugleisten,

Figur 3

eine schematische Ansicht von Auftragsleisten und

Figur 4

eine Aufnahme einer alternativen erfindungsgemäßen7 Holzwerkstoffplattenvergütungsvorrichtung.

In the following the invention will be explained in more detail by means of exemplary embodiments. It shows

FIG. 1

a schematic view of a wood material board compensation device according to the invention,

FIG. 2

a schematic view of suction bars,

FIG. 3

a schematic view of order bars and

FIG. 4

a picture of an alternative 7 wood material board compensation device according to the invention.

FIG. 1 shows a wood-based panel compensation device 10, which has a schematically drawn receptacle 12 in the form of a metal frame for supporting a wood-based panel 14. The receptacle 12 touches the wood-based panel 14 in a support surface A. The wood-based panel compensation device 10 also has a suction device 16 which includes a suction bar 18.1. The squeegee comprises a U-shaped metal profile 20 with a rectangular Saugraumquerquerschnitt Q. The squeegee 18.1 has a Saugraumbreite B _S and a Saugraumtiefe T. A bottom 22 of the wood-based panel 14 facing a seal 24 is disposed of rubber, so that a suction chamber 26 is formed ,

The squeegee 18.1 is connected via a vacuum line 28.1 with a vacuum system, not shown, which includes a likewise not shown vacuum pump in the form of a piston pump. With the help of the vacuum pump, a Saugraumluftdruck p _{S is} adjustable in the suction chamber 26.

With respect to the wood-based panel 14 of the squeegee 18.1 opposite an application bar 30.1 is arranged, which has a base body 32 in the form of a U-shaped metal profile. Facing an upper side 34 of the wood-based panel 14, the application strip 30 has a seal 36 which delimits a tempering strip 38 on the wood-based panel 14. The tempering strip 38 is the one strip-shaped Part of the upper side 34 of the wood-based panel, which is provided for applying a tempering liquid 40. The tempering liquid 40 is held in a tempering liquid tank and is fed via a supply line by means of a not shown pump to an application head 42. By the application head 42, the compensation liquid 40 can be applied by a not shown dosing on the annealing strip 38. The seal 36 prevents the quench liquid 40 from leaving the quench strip 38.

The application strip 30 has a Aufbringleistenbreite B _A , which essentially corresponds to the Saugraumbreite B _S , which is to be understood in particular that the Saugraumbreite B _S of Aufbringleistenbreite B _A by not more than 25%.

Both the seal 24 of the squeegee 18 and the seal 36 of the application strip 30 are made of rubber with a hardness of 60 Shore A.

FIG. 2 shows a view of an applicator 44, which comprises several Aufbringleisten 30.1, 30.2, ..., 30.11. The Aufbringleisten 30.2 to 30.6 are each constructed identically and arranged in pairs equidistant side by side. The same applies to the Aufbringleisten 30.7 to 30.11. The application strip 30.1 is arranged perpendicular to the other Aufbringleisten. The detail A shows that each application strip has a multiplicity of application heads 42.1, 42.2, 42.3,... Arranged at equidistant intervals. All Aufbringleisten 30 form a total compensation area V when they rest on the wood-based panel. The compensation area V is preferably smaller than one fifth of the surface of the wood-based panel.

FIG. 3 shows the suction device 16 with suction bars 18.1 to 18.11, which are not connected to each other. Each individual squeegee 18 is connected via a not-shown vacuum line to the vacuum system. Here, as below, reference numerals without Zählsuffix denote the object as such. For example, the squeegee 16.8 is connected via a vacuum valve 46 to the vacuum system.

By switching the associated vacuum valve so that each squeegee 18 can be acted upon individually with a negative pressure.

To carry out a method according to the invention, the wood-based panel 14 is first placed on the receptacle 12 (FIG. FIG. 1 ). Subsequently, all or part of the suction bars 18 are subjected to negative pressure, whereby the seals 24 deform and produce an intimate seal with the underside 22 of the wood-based panel. Subsequently, the applicator 44 is lowered onto the wood-based panel 14, that the tempering strip 38 directly opposite the suction chamber 26.

Compensation liquid 40 is now injected through the application head 42 into the base body 32, which can not leak through the seal 36. Due to the negative pressure in the suction chamber 26, the compensation liquid 40 is drawn in a predetermined amount, which can range from a few grams to two kilograms per square meter, in a resulting annealing region 48 in the wood-based panel 14 and pressed by the ambient pressure in the wood-based panel 14. The applicator may be configured to apply an individual amount of annealing liquid 40 to each individual applicator bar 30

After a predetermined time, the applicator 44 are removed and the suction device 16 is vented and also removed. It is possible to heat the annealing area 48 and / or the tempering liquid 40 to lower the viscosity of the tempering liquid 40. This can be done in the case of the plate, for example by not shown infrared radiators or heated rollers. The tempering liquid can be adjusted for example by preheating the processing viscosity.

It is particularly favorable if the tempering liquid is colored. This makes it possible to check whether the order has been carried out as specified. It is also possible to choose the coating liquid 40 colorless or a further component but fluorescent under UV light. In this case, the finished wood-based panel is irradiated with ultraviolet light for quality control.

All suction pads 18 ( FIG. 3 ) have together a suction surface F, which corresponds to a fraction of a surface S of the wood-based panel 14. For example, the suction surface is only 1/10 or even less of the surface S of the wood material board 14th

FIG. 4 shows a recording of an alternative invention wood panel plate compensation device in cross-section (upper part) and in a view from above (lower part) with respect to the cutting plane C - C. In the upper part of the figure, it can be seen that the receptacle 12, a plurality of channels 50.1, 50.2 , ..., of which in FIG. 4 only channels 50.1 and 50.2. you can see.

The channels are arranged at a distance K from each other and each have a plurality of holes 52.1, 52.2, ..., which lead to a not shown vacuum manifold. At the end of this vacuum manifold, a vacuum pump connection is formed, for example, a nozzle or other connection. This vacuum pump connection is releasably connected to a vacuum pump, also not shown.

The wood-based panel compensation device has at least two seats 12 according to FIG FIG. 4 , which differ in particular at the distance K from each other. The vacuum pump connection is always in the same place with respect to the outer dimensions of the receptacle 12. If the recording is to be changed, the currently used recording is released from a frame and removed from the frame. Thereafter, the new recording is placed on the frame and connected to the frame. The vacuum pump connection is arranged so that the channels 50 can be quickly connected to the vacuum pump because the vacuum pump connection is located in the immediate vicinity of the vacuum pump. To carry out a method according to the invention, the wood-based panel 14 is placed on the receptacle 12. Optionally, the wood-based panel 14 can be clamped to the receptacle 12 by means of clamping means. At sufficiently strong vacuum but that is unnecessary. The procedure is then carried out as described above.

LIST OF REFERENCE NUMBERS

10

Wood-based panel tempering device

12

admission

14

Wood panel

16

suction

18

squeegee

20

metal profile

22

bottom

24

poetry

26

suction

28

Vacuum line

30

Aufbringleiste

32

body

34

top

36

poetry

38

compensation strips

40

compensation liquid

42

application head

44

applicator

46

vacuum valve

48

compensation area

50

channel

52

drilling

A

bearing surface

B _A

Aufbringleistenbreite

B _s

Saugraumbreite

F

suction

K

Distance of the channels

S

surface

T

Saugraumtiefe

p _s

Saugraumluftdruck

Q

Saugraumquerschnitt

V

Compensation area surface

Claims (15)

Wood material board compensation device with (A) a receptacle (12) having a support surface (A) for supporting a wood material panel (14), and (B) a suction device (16) for applying a negative pressure to a surface (S) of the wood-based panel (14), which lies on the support surface (A),
characterized in that (c) the suction device (16) comprises a plurality of suction strips (18), (d) wherein the suction bars (18) (i) run at least in sections in a straight line, (Ii) on its the bearing surface (A) facing side seals (24) and have (iii) are designed to form an evacuable suction chamber (26) with a bearing on the bearing surface (A) wood-based panel (14) having a the wood material panel (14) facing the suction surface (F). Wood material board compensation device according to claim 1, characterized by an application head (42) which is designed to apply a tempering strip (38) to tempering liquid (40) having a predetermined coating stripe width (B _A ), - wherein the suction bars (18) have a Saugraumquerschnitt (Q), which has a Saugraumquerschnittfläche which is smaller than the product of the remuneration strip width (B _A ) and 20 mm. Wood material board compensation device according to one of the preceding claims, characterized in that individual suction strips (18) or groups of suction strips (18) via associated vacuum valves (46) with each other and / or connected to the vacuum pump, so that the individual suction strips (18) or groups of Suction strips (18) can be acted upon individually with negative pressure. Wood material board compensation device according to one of the preceding claims, characterized in that the suction strips (18) relative to the receptacle (12) are movably mounted so that a deformation of the seals (24) due to the negative pressure to a movement of the suction strips (18) on the wood material board (14) leads to. Wood material board compensation device according to one of the preceding claims, characterized in that the seal (24) has a hardness of 30 to 70 Shore A. Wood material board compensation device according to the preamble of the preceding claims, - wherein the receptacle (12) has a plurality of at least partially rectilinear channels (50), - Wherein the channels (50) in the bearing surface (A) open and are formed to form with a bearing on the surface (A) wood-based panel (14) the evacuable suction chamber (26) having a the wood-based panel facing suction surface (F) has. Wood material board compensation device according to claim 6, characterized by - A frame for receiving the receptacle (12) and at least two receptacles (12) which differ with regard to an arrangement of the channels (50) and each comprise at least one vacuum pump connection for connecting the channels (50) to a vacuum pump, - Wherein the vacuum pump connections are arranged in the operating position in the same place. Wood material board compensation device according to claim 7, characterized in that the vacuum pump connections of the receptacles (12) are arranged so that they are adjacent in the operating position of the vacuum pump. in the vicinity adapter-free connected to the vacuum pump connection, in particular pluggable, are. Wood material board compensation device according to one of claims 6 to 8, characterized in that the channels have a width of less than 50 mm. Wood material board compensation device according to one of claims 6 to 9, characterized in that the receptacle (12) on its support surface (A) has a hardness which is greater than a hardness of the wood-based panel. Method for producing a wood-based panel, with the steps: (a) supporting the wood-based panel on a bearing surface (A) of a wood-based panel treatment apparatus according to one of the preceding claims, (B) evacuating the suction chamber (26), so that in the suction chamber (26) creates a negative pressure, and (c) applying compensation liquid (40) to a suction region (26) opposite compensation area (48) of the wood-based panel (14), so that the compensation liquid (40) is pulled due to the negative pressure in the wood-based panel (14) and thus forms a remuneration , Method according to claim 11, characterized by the steps: (D) replacing the receptacle (12) by a second receptacle (12), which differs with respect to an arrangement of the channels (50) and (e) applying compensation liquid (40) to the compensation area (48) opposite the suction space (26). Method according to one of claims 11 or 12, characterized in that the tempering liquid (40) at 22 ° C and 1013 hPa has a viscosity of more than 1 mPa ^· s, in particular of more than 10 mPa ^· s. Method according to one of claims 11 to 13, characterized in that the tempering liquid (40) is hydrophilic. Method according to one of claims 11 to 14, characterized in that a colored tempering liquid (40) is used.

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