FI118824B - Method and apparatus for contact drying of turned or plan cut wood boards - Google Patents

Description

5 118824

Method and apparatus for contact drying of turned or cut veneer sheets - Förfarande och anordning för contactor av svarvade eller planskurna träskivor

Firstly, the invention relates to a method for contact drying of turned or cut wood veneers, wherein heat is applied to a fresh wood veneer having a fresh moisture content while being subjected to compression to obtain a dried wood veneer. The invention also relates to an apparatus for contact drying of turned or cut wood veneers, comprising: a first strip assembly and a second strip assembly, the first strip assembly comprising a first metal strip, and the second strip assembly comprising at least a second metal strip, which strip assembly arranged to take on wood veneers; heating means for heating at least the first metal strip to the first temperature; and pressing means for pressing the first strip assembly and the second strip assembly toward each other during said heating, wherein the wood veneer therebetween is subjected to compression pressure.

Currently, the use of a convection-based roller dryer ("roller dryer"), or hot air dryer, is commonly used for drying wood veneers. Here, hot air is blown through separate nozzle boxes to both surfaces of the veneer while the veneer moves between the rollers from the beginning of the dryer to its end. From the veneers, moisture, i.e. water, is transported as gas and / or steam to said hot air and exits therefrom from the drying chamber. Prior to its exit, the veneer is cooled by taking out 25 clubs of inflatable air directly from the outside and blowing it back out as such after cooling. This type of arrangement for drying rigid or semi-rigid sheets is described in US 4,215,489. In this drying method, the so-called "veneer" is easily left in the veneer. "water spots" because the veneer is inhomogeneous both in terms of moisture content and moisture removal. 30 To avoid moisture patches, the veneer must be "over-dried" to almost 0% humidity when the optimum value for strength would be 6% to 7% final moisture relative to the dry matter. Too dry the veneer becomes brittle and becomes copious it is poorly resistant to handling and the strength properties of the product it is made of are plywood or plywood or similar products made from veneer ash, 35 clubs stacked and arranged in suitable positions with one another in layers of convergent material and other materials. The thicker-dried veneers have a high degree of moisture dispersion, which also makes it difficult for the adhesive manufacturers to develop their Himos in a desired and controlled way reactive.

Another possibility is to use, for example, US Patent 4,193,207. a touch drying method of the type described and a press dryer, wherein each veneer sheet is held pressed between two hot and rigid metal plates, whereby the two surfaces of the veneer have the same high temperature and the water evaporating on both sides of the veneer is discharged through steam strips. In this case, the contact temperature of the metal sheets with respect to the veneers is arranged between 121 ° C and 204 ° C, in order to equalize the moisture differences and the compression pressure of the veneers can be kept between 34 kPa and 483 kPa. Thus, it is possible to achieve a relatively uniform humidity, which can typically be between 5% and 5%. Due to the high compression pressure, the veneer is compressed and the production efficiency is reduced compared to the convection / hot air dryer described above. JP-01-107084 also discloses a press drier for drying individual veneer sheets, wherein the surfaces of the hot metal slabs that press the veneer are slightly convex, which is intended to prevent the formation of moisture patches on the veneer sheet. Due to changes in temperature and temperature, there are some grooves in the contact surfaces of the metal tiles, and it is further suggested to use steel strips between the hot metal plates and the veneer, which can move a predetermined distance.

It is an object of the present invention to provide a method and apparatus for drying wood veneers to achieve a uniform and desirable final moisture content to the veneers. It is a further object of the invention to reduce the tendency of veneers to produce so-called. peeling cracks and keeps the volume changes of the veneer small during drying. It is a further object of the invention to provide such dried veneers, from which it is possible to make plywood and / or laminated wood with high strength properties.

The problems described above can be solved and the objects defined above accomplished by a touch-drying method according to the invention, characterized by what is defined in the characterizing part of claim 1, and by a touch-drying device according to the invention, characterized by what is defined by

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The invention will now be described in detail with reference to the accompanying drawings.

Fig. 1 schematically illustrates a preferred first to * · *; ' 3 in plane I-I of Figure 3.

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Fig. 2 schematically shows another embodiment of the apparatus according to the invention in a convex cut, taken along the plane II-II in Fig. 4.

. . Fig. 3 schematically shows an apparatus according to the first embodiment in a transverse sectional view, taken along the plane III-III in Fig. 1.

Fig. 4 schematically shows an apparatus according to a second embodiment in a transverse cross-section along the plane IV-IV of Fig. 2.

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Fig. 5 schematically shows an apparatus according to a third embodiment of the invention in a transverse cross-sectional view, in a similar view to that of Figs. 3 and 4.

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Figures 6A to 6B show the temperature distributions provided by the invention in response to the veneer of adjacent Figures 3, 4 and 5 respectively and the components on both sides thereof, i.e., temperature profiles between the first hot temperature and two cold second temperatures.

The device for contact drying of turned or cut wood veneers comprises a first ribbon assembly 3 and a second ribbon assembly 4. The first ribbon assembly 3 comprises a first metal ribbon 1 and a second ribbon assembly 4 comprises at least 10 second metal ribbons 2. These ribbon assemblies 3 and 4 is arranged to intervene with wood veneers 5 which are dried by this device. For this purpose, the strip arrangements 3 and 4 are parallel to one another and at a distance S3 corresponding to the thickness S2 of the veneers. "Wood veneer" or "veneer" refers to thin sheets of wood logs ("log") obtained either by rotary peeling or "sliced" parallelism of wood logs. wooden boards. Thus, in both of these, the wood is cut by the movement of a cutting edge having a "slash" that cuts wood veneers substantially without any waste material, which is a different principle than sawing where a large number of separate small blades removes the material as chips. or demolish between the final products. Turning is the more common method because it produces larger veneer sheets. It is noted that the invention disclosed herein does not relate to the drying of sawn products. Wood veneers are either plywood ("plywood") or laminated veneer lumber (wood veneer), in which the wood veneer directions may be perpendicular to one another, or the wood veneers may have one to 25 directions, the wood veneer directions may form an angle of 90 ° and 0 °, or the plywood / lumber structure may be a combination of these. Cotton -... The thickness and size of the wood varies depending on the type of wood and the application, but is usually no more than 8 mm and typically 2.5 mm ~ 5 mm for solid wood, and usually the most -.:. 5 mm and typically 1.5 mm to 4 mm for plywood. Planed or cut wood veneers 30 are often thinner up to 0.5 mm. Further, the device comprises heating means ** ·; * 11 for heating at least the first metal strip 1 to the first temperature T1 and pressing means for pressing the first strip assembly 3 and the second strip -: [**] to each other during said heating, 5 is subjected to a compression pressure P.

. According to the invention, the second ribbon assembly 4 comprises, in addition to said second metal ribbon 2, at least one porous wire ribbon 6 or, in this second metal ribbon: 2, one porous surface portion 8. Each of these alternative components. the first wire strip 6, as well as the porous surface portion * ·; · * 40 8, are located between this second metal strip 2 and the wood veneer 5. It is further emphasized: If: the device has a first wire strip 6, it is a color between the second metal strip and wood veneer. as shown in Figure 3; If the device has a porous surface portion 8 on the surface of the second metal strip 2, it is between the second metal strip and the wood veneer, as shown in Figure 4. In particular, according to the invention, the device is provided with cooling means 12 for keeping the second metal strip 11882 at a second temperature T2 which is a temperature difference ΔΤ lower than said first temperature T1, i.e. the temperature of the first metal strip 1. said temperature difference ΔΤ is at least 60 ° C or at least 80 ° C or at least 100 ° C. The above-mentioned first temperature T1 is at least 120 ° C and 5 is at most 210 ° C. The choice of the first temperature within this temperature range is influenced by e.g. the type of wood and the desired properties of the veneer or plywood made from veneers. According to the invention, the aforementioned second temperature T2 is at most 50 ° C or at most 30 ° C. In this case, the temperature difference T1-T2 = ΔΤ of the first and the second temperature is at least 60 ° C or at least 80 ° C or at least 100 ° C. In principle, the greater the temperature difference ΔΤ between the temperatures T1, T2 of the first and second metal strips, the more efficient the drying of the wood veneer according to the invention. This temperature difference is limited only by the heat resistance of the wood and the low temperature at which it makes economic sense to cool. In practice, it may be possible to use the larger temperature differences ΔΤ mentioned above, such as 130 ° C, 160 ° C or even 180 ° C.

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The aforesaid heating means 11 for heating the first metal strip 1 can be implemented in a number of ways. First, a hot-pressure chamber 18 formed by said movable first metal strip 1 of one wall may be used. The other walls 38 of the hot pressure chamber 18 are typically solid. Thus, 20 hot pressure chambers are delimited, for example, by five if the chamber is approximately parallelepipedic, with a fixed wall and a single strip or wall-movable or movable first strip assembly 3 and a first metal strip 1 as can be understood from Figures 1 and 3. Of course, other forms of hot pressure chamber can be used. In the pressure chamber 25 thus formed, pressurized hot medium F1 is circulated at a temperature Τ1 + ε1 producing a first temperature T1 to the first metal web. It is clear that the temperatures of the first metal strip and the heat medium have a small temperature difference ε1 due to heat transfer, but can often be neglected. That is to say, the temperature of the pressurized hot medium F1 is the first difference. 30 ε1 higher, i.e. T1 + ε1, than the predetermined temperature T1 of the first metal strip. Alternatively, a solid hot piece 19, *! ': * May be used along which one first surface assembly 3 and the first metal strip 1 move, as will be understood from Figures 2 and 4. The hot piece 19 has conductors 20, either fluid tubes or electrical conductors, which circulate the hot medium F1 •. *; 35 or electric current E generating a temperature Τ1 + ε2,. which produces a first temperature T1 on the first metal strip. Generally speaking, this small second temperature difference ε2 is slightly larger than the aforementioned en- • 4: first temperature difference ε1 because the heat transfer path itself has a hot body and an overlap between the metal strip and the hot body. In this recent implementation,. *. In fact, the temperature of the hot medium F1 is even higher than the temperature app2 + ε2 of the hot body 19, due to the heat transfer between the medium and the hot body.

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The cooling means 12 according to the invention can be implemented in several ways. First, a cold pressure chamber 28 formed by said movable second metal strip 2 on one wall can be used. The other walls 48 of the cold pressure chamber 28 are typically solid. Thus, the cold pressure chamber is delimited, for example, by five if the chamber is a substantially rectangular, fixed wall, and one rib or wall arrangement 4 and one metal strip 2 movable or movable in the direction of its plane as shown in Figures 1 and 3. Of course, other forms of cold pressure chamber 28 can be used. The pressure chamber thus formed circulates pressurized cold medium F2 at a temperature Τ2-ε3 to another 10 strips of metal producing a second temperature T2. It is clear that the temperatures of the second metal strip and the refrigerant have a small third temperature difference ε3 due to heat transfer, but this can often be neglected. Strictly speaking, the temperature of the pressurized cold medium F2 is a third difference ε3, i.e. Τ2-ε3, than the predetermined temperature T2 of the second metal strip. Alternatively, a solid cold piece 29 may be used, along which one of the outer strips 4 and the second metal strip 2 move along one outer surface, as will be understood from Figures 2 and 4. The cold body 29 has channels 30 for circulating the refrigerant medium F2, generating in said cold body 29 a temperature Τ2-ε4 which produces a second temperature T2 on the second metal strip. In general, this small fourth temperature difference ε4 is slightly larger than the third temperature difference ε3 mentioned above, since the heat transfer path itself has a cold body and an overlap between the metal strip and the cold body. In this latter embodiment, in fact, the temperature of the refrigerant medium F2 is even lower than the temperature Τ2-ε4 of the refrigerator 29 due to the heat transfer between the medium and the refrigerator.

25

It will be understood that a combination of hot pressure chamber 18 and cold pressure chamber 28 may be used, as in Figure 3, or a combination of fixed hot body 19 and solid: ** cold body 29 as in Figure 4, or hot pressure chamber 18 and ..!: * Solid cold body 29. , or a combination of a solid hot piece 19 and a cold ni 30 pressure chamber 2, as in Figure 5.

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The apparatus includes actuators 9 for moving the first tape assembly 3 and the second tape gun ***** assembly 4 at the same speed V, either continuously or intermittently between the hot pressure chamber or hot block and the cold pressure chamber or cold block 35 described above. At the same time as the first and second strip arrangements with the first and second metal strips 1, 2 pass between the hot pressure chamber or the hot body and the cold pressure chamber or the cold body opposite to it, the press. *. 40 pressures P. In the direction of movement of the hot pressure chamber or hot body and the tape assemblies i opposite the cold pressure chamber or cold body i, i.e. in the direction of velocity V, the strip arrangements 3, 4 to the metal tapes 1, 2 In all embodiments, the first assembly 21 comprises a first track 21 through which at least a first metal web 1 rotates at least a first belt assembly 3, and a second track 22 through which at least a second belt assembly The second metal strip 2 wraps in. In the first embodiment of the invention there is also a third roll 5 through which the porous first wire strip 6 is wound as shown in Figure 1. The embodiment of Figure 1 further comprises a second wire strip 7 passing through the dry wire zone DZ wood between the veneer, or in another possible embodiment, between the porous surface portion 8 of the second metal strip and the wood veneer 5. This possible second wire strip 7 passes through a fourth roll 10 24. In another embodiment of the invention, through the second roller 22, the second metal strip 2 with its porous surface portions 8 rotates around the actuators can be of any known or new type suitable for the purpose and are not described in detail.

In a first embodiment using a first wire strip 6 for taking and removing condensable water, the apparatus further comprises a second metal strip 2 dryer 34 and a porous wire strip dryer or dryers 35 and / or 36. For example, the second metal strip dryer 34 is a scraper from the surface of the metal strip 2 facing toward the wood veneer in the drying zone DZ 20, the residual water it has when the second ribbon assembly 4 is separated from the dried wood veneer and the first wire ribbon 6 is further separated from the second metal ribbon 2. In this embodiment most of the condensed water is in said second intermediate band. A possible second wire strip 7 acts as a separator between the first wet 25 wire strips and the dried wood veneer, and the water is only intended to pass through it. The porous first wire strip 6 has its own dryers 35, 36 which are preferably vacuum suction devices, i.e. they suck water out of the porous portion of the wire strip 6, after which the first wire strip 6 is able to re-absorb water to dry the new wood veneer. Dryers 35, 36 can be quite simple and yet effective because the first wire strip 6, as well as the second wire strip 7 subsequently formed, are air-permeable, whereby drying can be done by flow. The optional second wire strip 7 may be dried by means similar to the first wire strip or, depending on the structure of the wire strip, not dried, since the main purpose of the second wire strip is to separate the first wire strip 6 for condensing water. The second wire strip 7 thus acts as an insulator. Because it also needs to penetrate well the moisture from the wood veneer, it makes sense to make it thinner or have a mouth:. **. better pores than the first wire band. In another embodiment, wherein: a porous surface portion 8 on the surface of the second metal strip is used to take and remove the condensable water, the device further comprises a surface of the second metal strip. a portion dryer 17, thereby removing water from pores j of the porous surface portion 8, after which the surface portion 8 of the second metal strip is capable of re-receiving water to dry the new wood veneer. Because it is a coating, it cannot be dried with the same air flow rate as the wire strips. Thus, however, only 17 118824 may consist of a vaporizer 32 which heats the metal strip and its surface portion by evaporating the water in the pores, and possibly a vacuum suction device 33 which removes this evaporated water. The dryers may also be of another type known per se or of a new type suitable for the purpose.

5

Said hot-pressure chamber 18 and / or cold-pressure chamber 28 and / or hot-piece 19 and / or cold-piece 29 produce a press pressure P of at least 20 kPa and at most 500 kPa, i.e. these chambers and / or bodies. These press means are implemented by one of the following alternatives: 10 Opposite of the hot pressure chamber 18 and the cold pressure chamber 28, each of said media F1 and F2 has a predetermined overpressure Φ that produces said press pressure P on the veneer; or

A fixed hot piece 19 and a solid cold piece 29 facing each other and a related clamping force mechanism 23 disposed in syn 15 to provide said clamping pressure P; or

Opposite to each other of the hot pressure chamber 18 and the solid cold body 29, the hot medium F1 has a predetermined overpressure Φ that generates said compression pressure P on the veneer; or

Opposite each other of the fixed hot body 19 and the cold pressure chamber 28, wherein the cold medium F2 has a predetermined overpressure Φ that generates said compression pressure P on the veneer.

The veneered or cut wood veneers 5 according to the method are contact-dried as follows. In the method, the undried wood veneer 5 having a fresh moisture content 25 RH1 is fed fresh ("green") to a first strip assembly 3 comprising a first metal strip 1 and a second strip assembly 4 comprising a second metal strip 2 and at least one porous wire strip 6. or porous surface · * ·,. 8 and contact with them. The belt arrangements 3,4 are brought together by the first * track 21 and at least the second track 22 as shown in Figures 1 and 2 *; 30 is understandable, and at the same time veneer 5 is usually brought in sheets. The strip arrangements are such that the porous surface portion 8 of the wire strip 6 or the other metal strip, respectively, is located between the second metal strip and the wood veneer. The first belt assembly 3 and the second belt assembly 4 are moved at the same speed V, either intermittently or without interruption during drying. Tape arrangements. 35, thus moving and possibly lingering with each other synchronously at a distance S1 corresponding to the thickness * ··· * 'S2 of the wood veneer 5 in the longitudinal direction of the strips at least · * ... · * in the drying zone DZ. Before drying according to the invention in the drying zone). DZ has a wood veneer 5 having a fresh moisture content RH1, which may be the natural moisture of the wood or raised to the desired value by humidification or, most commonly, raised to 40 as high as possible. The natural humidity of wood and thus of wood veneer may vary:. within wide limits depending on e.g. the species of wood, the place where the timber was harvested, the time of harvest and the conditions of transport and storage of the timber, ie logs harvested from the forest.

In addition, even within a single log, the moisture content of, for example, heartwood and topwood may vary considerably. In particular, it is noted that the moisture content percentages RH1 and RH2 used herein refer to the weight of water in the wood relative to the dry weight of the wood in question, i.e., the weight of water relative to the dry matter. Thus, for example, RH1 = 40% means 40 kg of water in the wood, which weighs 100 kg when absolutely dry, 5 100% humidity would mean 100 kg of water in 100 kg of dry wood, etc. Wetting is done by incubating ("soking") logs, for example. in water before turning or cutting veneer. The log is intended to contain as much water as possible in the incubator, so that the cells and the spaces between the cells are filled with water, which supports the wood material in the cutting / turning situation so that the wood does not break with tearing. Due to this, the moisture content of the veneer is 10 as high as that remaining after turning, so the moisture content of the wood veneer RH1 is maximum or - of course, considering the possible losses - approaches maximum.

In the drying zone, the strip arrangements with their components and veneer are arranged in the following order, from the hot side to the cold side: First metal strip 1 of the first strip assembly 3 - Wood veneer 5 - Optional second wire strip 7 - Second porous first wire strip 6 or second metal strip porous surface portion 8 - second metal strip of second ribbon assembly 4. In this drying zone DZ, the first metal strip 1 is heated to a first temperature T1 and simultaneously the second metal strip 2 is kept cold, i.e. a second temperature T2, which is a temperature difference ΔΤ lower than said first temperature. Thus, the second metal strip 2 is cooled, for example with water or the like, at least relative to the first metal strip 1. During this drying zone DZ and thus during said heating at temperature T1, and during the cold holding at temperature T2, the metal strips 1, 2 are pressed towards each other wood veneer is subjected to a compression pressure P of said en-f #; j * first metal strip and said wire strip or surface portion. Further, in this drying zone DZ, the condensed water from the first temperature T1 is condensed by the second temperature T2 from the wood veneer 5 into said first wire strip 6 or surface portion 8. These processes in the drying zone DZ are substantially simultaneous whether the movement of the strip assemblies periodic. Thus, within the drying zone, the result is: ***. a dried veneer 5 from which moisture, i.e. water, has been separated and displaced by the effect of temperature on the first wire strip 6 or surface portion 8. Simultaneous pu. The maintenance of the cross pressure P further improves the strength of the dry veneer.

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Next, the thus dried wood veneer 5 is removed from the first strip arrangement 3. \ m and the second belt assembly 4, i.e. the drying zone DZ. After the wood veneer 5 has been removed between the first ribbon assembly 3 and the second ribbon assembly 4 40: said second metal ribbon 2 and said at least one porous wire ribbon:. ha 6 or surface portion 8 is dried by scraping K and / or vacuum S1, S2 as above | has already been described. The first ribbon assembly 3 and the second ribbon assembly 4 are then allowed to return to the step of feeding a fresh said fresh veneer 5 between them, wherein said contact drying is intermittently or continuously performed. In other words, the strip arrangements 3, 4 move through the drying zone DZ and carry with them the veneer to be dried according to the invention. Generally, only the actuators 9 of the second ribbon assembly, either on the roll 21 of the first ribbon assembly 3 or the roller 22 of the second ribbon assembly 4, have movable machinery because the second ribbon assembly 4 or 3 moves like the veneer. The dried or dried wood veneer 5 according to the invention preferably has a final moisture content RH2 of less than 12%, which water content is thus also calculated on a dry weight basis.

Briefly, the invention operates as follows. The cut / planed or 10 turned and wet veneer sheets are fed into a press dryer with hot top and cold bottom on opposite sides of the wood veneer. The veneer is pressed with a small but sufficient pressure between the surfaces. The hot upper surface is typically smooth and the cold lower surface is provided with a groove or wire mesh for draining water. In addition, the drainage on the underside can be enhanced with reduced pressure. When there is a clear temperature difference between the surfaces, the water condenses on the lower surface of the dryer. Thus, a significant part of the water in the veneer is removed without boiling and causing extensive damage to the veneer when expanded. However, heating the wood veneer increases the vapor pressure of the water therein, whereby the water tends to migrate to a region of lower vapor pressure, that is to the porous surface portion of the first porous wire or second metal strip, where it condenses at low temperature below dew point. "). In short, the water is removed from the wood veneer 5 by steam at the first temperature T1, allowed to condense at the second temperature T2 at the second site, and finally removed by separating the first wire strip or surface portion from the dry veneer.

25

The new method is capable of drying each veneer sheet differently or dividing continuous veneers or veneer sheets into subdivisions for which a site-specific drying pattern can be provided. For this purpose, for example, the transport speed V of the veneer through the drying zone DZ * may be infinitely adjusted for a continuous process, teaspoon 30 or the dwell time of the veneer sheets in the drying zone DZ may be adjusted, for example, according to the veneer process. In the continuous process, the wood veneer passes through a constant or variable speed V into the drying zone: ***, while in the batch process, the wood veneer enters the drying zone at some rate V, stays there for a predetermined time and is subsequently removed. 35 at speed V. This allows the veneer to be dried to the desired moisture level. This allows the gluing of veneers to be improved in terms of both reactivity and process * ... · *. As a result, the average strength of the final product increases and • the dispersion decreases. Both contribute to the characteristic strength of the product. Also, the sparse underside formed by turning cracks in veneer turning can be sealed. It is able to influence the shear strength of the veneer:! ·. ("Rolling shear") in the direction of the veneers.

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Claims (18)

A method of contact drying turned or cut wood veneer, wherein the fresh wood veneer is supplied with heat with a fresh moisture content (RH1) while being subjected to pressing, thereby providing dried wood veneer, characterized in that: 15. said wood veneer (5) is measured in fresh in contact between a first strip array (3) and a second strip array (4) and in contact therewith, the first strip array comprising a first metal strip (1), and the second strip array comprising a second metal strip (2) and at least one porous wire band (6) or a porous surface section (8) between the second metal band and the wood veneer 20. The first metal band (1) is heated to a first temperature (T1) and the second metal band (2) is cooled to a second temperature (T2). , which is lower than said first temperature corresponding to a temperature difference (ΔΤ); - the belt arrangements (3, 4) are pressed against each other during said heating and cooling, the intermediate wood veneer being subjected to a pressing pressure (P) from said first metal band and from said wire band or surface section; - the water which is separated from the wood veneer under the influence of said first temperature VV * is allowed to condense under the influence of the second temperature of said wire band: y (6) or surface section (8); and - wood veneers (5) dried in such a manner are removed from the space between the first strip set (3) and the second strip set (4). • ♦ · * · · mVV. Process according to claim 1, characterized in that said temperature difference ***** (ΔΤ) is at least 60 ° C or at least 80 ° C or at least 100 ° C. Γ · .. 35 Method according to claim 1 or 2, characterized in that said first temp. temperature (T1) is at least 120 ° C and not more than 210 ° C, and that said second temperature (T2) is high 50 ° C or high 30 ° C. • * · • * «m 4. A process according to claim 1 or 2 or 3, characterized in that said compressive pressure (P) is at least 20 kPa and not more than 30 ° C. • »• · · •: / ·: 5. Process according to any of the preceding claims, characterized in that the wood moisture content (RH1) of the wood veneer is a moisture produced by a log that has been bathed in water before turning or cutting the wood veneer. 14 1 1 8824 Current (E) circulates and generates a temperature (Τ1 + ε2) of said heating element (19) which generates a first temperature (T1) in the first metal strip. Method according to claim 5, characterized in that said fresh moisture content (RH1) is as high as possible; and that the final moisture content (RH 2) of said dried wood veneer (5) is below 12%. 5 Process according to any of the preceding claims, characterized in that after removing the wood veneer (5) from the space between the first strip arrangement (3) and the second strip arrangement (4), said second metal strip (2) and said at least one porous wire band (6) or the surface section (8) by abrasion (K) and / or vacuum suction (S1, S2). 10 Method according to claim 7, characterized in that said first strip arrangement (3) and said second strip arrangement (4) return to a stage in which new fresh wood veneer (5) is measured between them, said contact drying being performed. periodically or continuously. 15 Method according to any one of the preceding claims, characterized in that the first strip array (3) and the second strip array (4) are moved at the same speed (V) and continuously during drying. Apparatus for contact-drying lathe or cut wood veneers, which includes: - a first strip array (3) and a second strip array (4), the first strip array comprising a first metal strip (1), and the second metal strip; it comprises at least a second metal strip (2), which strip arrangements are arranged to receive wood veneers (5) in its intermediate space; heating means (11) for heating at least one first metal strip (1) to a first temperature (T1); press means for pressing the first strip array (3) and the second strip array (4) against each other during said heating, the wood veneer between: [**: 30 being subjected to pressing pressure (P),. . ·. characterized in that the device further comprises: - that the second strip arrangement in addition to the second metal strip (2) comprises at least one porous wire strip (6) or a porous surface section (8) between the second metal strip and the wood veneer; 35. cooling means (12) for pouring the second metal strip at the second temperature (T2), ···. which is lower than said first temperature (T1) corresponding to a temperature difference (δτ); · - drive devices (9) for moving the first tape array (3) and the second: ***: tape array (4) at the same speed (V). ·· 1 40 • i v Device according to claim 10, characterized in that said heating element (11) is: - a heat pressure chamber (18), one wall of which comprises the first metal strip (1), wherein a pressurized heating medium (F1) is circulated in the pressure chamber. ) at a temperature (T1 + ε1) producing a first temperature (T1) in the first metal band; or - a solid piece of heat (19) along which one outer surface of said first metal strip (1) is passed, and comprising conduits (20), in which heating medium (F1) circulates or Apparatus according to claim 10, characterized in that said cooling means (12) is: - a cold-pressure chamber (28), one wall of which comprises said second metal strip (2), wherein pressurized cold medium (F2) circulates in the pressure chamber at a temperature ( Τ2-ε3) which produces a second temperature (T2) in the second metal band; or - a solid cold piece (29) along which one of the outer surfaces of said second metal strip (2) is provided, which comprises channels (30) in which a cold medium (F2) circulates and generates in said cold piece (29) a temperature (Τ2). -ε4) which produces a second temperature (T2) in the second metal band. Device according to claim 10 or 11 or 12, characterized in that said driving means (9) comprises: - a first roller set (21) through which the first metal strip (1) circulates; 20. a second roll set (22) through which the second metal strip (2) circulates, and - a third roll set (23) through which the porous wire strip (6) circulates. Device according to claim 13, characterized in that the device further comprises a wiper (34) for the second metal strip and a wiper for the porous waveguide or wiper (35 and / or 36); that the second metal band wiper (34) is a "*" scraper, and that the porous wire band wiper (35, 36) is a vacuum suction device. ♦ «· • Device according to claim 10 or 11 or 12, characterized in that said driving means (9) comprises:. - a first roller set (21) through which the first metal strip (1) circulates; and * ··· * - a second roller set (22) through which the second metal strip (2) and the porous surface sections (8) circulate. 35 •. * ··. Device according to claim 15, characterized in that the device further comprises a wiper (17) for the surface section of the second metal strip; and the wiper (17) of ··· ·, ·: the surface portion of the second metal strip is an evaporator (32) and, optionally, a vacuum suction device (33). ···: ·: 40 Device according to any one of claims 10-18, characterized in that said pressing means comprises one of the following alternatives: - a heat pressure chamber (18) and a cold pressure chamber (28) located opposite each other, wherein both said media (F1 and F2) has a predetermined overpressure (Φ) in the pressure chambers, which generates said compression pressure (P) in the wood veneer; or - a solid heatpiece (19) and a solid coldpiece (29) opposite each other and a pressing force mechanism (23) or connection thereto, which is arranged to generate said compression pressure (P) in the wood veneer; or - a heat pressure chamber (18) and a solid cold piece (29) opposite each other, the heating medium (F1) having a predetermined overpressure (Φ) in the heat pressure chamber which generates said compression pressure (P) in the wood veneer; or 10. a solid heating piece (19) and a cold-pressure chamber (28) opposite each other, wherein the cold medium (F2) has a predetermined overpressure (Φ) in the cold-pressure chamber to generate said compression pressure (P) in the wood veneer. Apparatus according to any one of claims 10-18, characterized in that it further comprises a second ribbon (7) running between the first ribbon (6) and the wood veneer (5), or a second metal ribbon between the porous surface portion. (8) and the wood veneer (5). · * · ··· »·· · · · · · ··· ···· · ·· · t · m · M · · · · · · · ··· ··· · · · ··· • · • • • ft * • ft · • · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · • ·· • ft