CN101443617A - Method and apparatus for contact drying of rotary-peeled or cut wood veneers - Google Patents
Method and apparatus for contact drying of rotary-peeled or cut wood veneers Download PDFInfo
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- CN101443617A CN101443617A CNA200780017588XA CN200780017588A CN101443617A CN 101443617 A CN101443617 A CN 101443617A CN A200780017588X A CNA200780017588X A CN A200780017588XA CN 200780017588 A CN200780017588 A CN 200780017588A CN 101443617 A CN101443617 A CN 101443617A
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- metal tape
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
- F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
- F26B13/105—Drying webs by contact with heated surfaces other than rollers or drums
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/18—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact
- F26B3/20—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact the heat source being a heated surface, e.g. a moving belt or conveyor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
- F26B2210/14—Veneer, i.e. wood in thin sheets
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- General Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Drying Of Solid Materials (AREA)
- Manufacture Of Wood Veneers (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The present invention relates to an apparatus for contact drying rotary-peeled or cut wood veneers. The apparatus comprises a first belt assembly (3), which comprises a first metal belt (1 ) and a second belt assembly (4), which comprises a second metal belt (2) and a porous screen band (6) or a porous surface section (8) in between the second metal belt and the wood veneer (5). The apparatus comprises heating means (11) for heating the first metal belt (1) to the first temperature (T1 ) and cooling means (12) for keeping the second metal belt (2) at the second temperature (T2), which is about the amount of the difference in temperature (detaT) lower than said first temperature (T1). Further the apparatus comprises pressing means to press the first belt assembly (3) and the second belt assembly (4) towards each other during said heating and cooling whereupon compression pressure (P) is applied to the wood veneer between them. The first belt assembly (3) and the second belt assembly (4) are moved at the same velocity (V) with a control unit (9).
Description
Technical field
The present invention relates generally to the method for the wood single-plate that is used for contact drying of rotary-peeled or cutting, and in described method, thereby the fresh veneer with greenwood water content is heated and is squeezed simultaneously and obtains dried single board.The invention still further relates to the equipment of the wood single-plate that is used for contact drying of rotary-peeled or cutting, described equipment comprises: first belt component and second belt component, wherein said first belt component comprises first metal tape, second belt component comprises at least the second metal tape, so these belt components are configured to wood single-plate is received between them; Heater, it is used at least the first metal tape is heated to first temperature; And pressurizing unit, it is used between the described period of heating first belt component and second belt component being pressed to the other side, and in this case, the wood single-plate that is between them is squeezed.
Background technology
At present, when being carried out drying, usually uses by veneer according to the feed-in principle and based on the drum dryer of convection current work, i.e. hot-air drier.Its work is to blow to hot blast on two surfaces of veneer by nozzle box independently when the front end of drier moves to the rear end between the cylinder at veneer.Moisture (being moisture) is transferred to the described hot blast from veneer with the form of gas and/or steam, and disappears from hothouse by hot blast.Before veneer arrived end, veneer obtained cooling by obtaining the air that directly is blown into from the outside and like this it being blown out again after cooling.In U.S. Patent Publication 4,214, this system that is used for dry rigidity and semi-rigid sheet of veneer has been described in 489.Veneer drying method disclosed herein usually causes occurring on veneer water stain, because wood single-plate all is uneven in the concentration of moisture with discharging.Water stain for fear of occurring, veneer must be become humidity near 0% by " over-drying ", though be the final moisture content with respect to dry of 6%-7% about the optimum value of durability.It is frangible and can be distorted to be subjected to over-drying veneer, and in this case, its durability is not enough to the durability of products variation that satisfies processing request and made by it.Usually, by relative to each other with other may material on correct position with veneer with the stacked mode suchlike product of glued board and laminate or other of making glued together mutually.In fact, the moisture transpiration of the veneer of convective drying is very obvious, in this case, for the glue producer their glue is modified to required and the controlled way difficulty more that becomes that reacts.
Another kind may use U.S. Patent Publication 4,193,207 described the sort of contact drying methods and extruding drier, wherein every veneer all is squeezed between the rigid metal plate of two high temperature, therefore have identical high temperature in the veneer both sides, discharge groove from the moisture of veneer by the steam on the metal sheet surface and evaporate.In this case, metallic plate and veneer contact that temperature is regulated so that moisture difference equalization between 121 ℃-204 ℃, and the squeeze pressure of veneer is maintained between the 34kPa-483kPa, promptly wants enough height so that veneer can not scatter.In this way, can obtain moisture level relatively uniformly, it usually can be between 1%-5%.Because this sizable squeeze pressure, veneer is extruded to together, and compares production efficiency with above-mentioned convection current/hot-air drier and descend to some extent.Disclosed Japanese patent application JP-01-107084 has also described a kind of extruding drier that is used for the independent sheet of veneer of drying, and wherein the surface that is used to push veneer of high-temperature metal plate is formed centrally water stain slightly to outer lug in sheet of veneer to attempt prevention.Because there are some grooves in these variations and temperature difference on the surface of metallic plate, and suggestion uses steel band to move preset distance to allow steel band between high-temperature metal plate and veneer in addition.
Summary of the invention
Target of the present invention is to set up a kind of being used for wood single-plate is carried out dry the processing obtaining the method and apparatus of needed final moisture content amount, and final humidity amount is even as much as possible.Another target of the present invention is to reduce veneer formation to peel off the possibility in crack, and in dry run the veneer Volume Changes is remained on the floor level.In addition, another target of the present invention is to form the veneer that is dried, and it can be used to produce glued board and/or the laminate with acceptable durability characteristics.
Be the contact drying method of feature and be that the contact drying equipment of feature can address the above problem and realize above-mentioned target by the defined content of the characteristic with claim 1 according to the present invention according to the defined content of the characteristic with claim 10 of the present invention.
Description of drawings
Describe the present invention below with reference to accompanying drawings in detail, wherein:
Fig. 1 be in Fig. 3 the I-I plane cutting and along the schematic diagram shown in the direction of transfer according to first preferred embodiment of equipment of the present invention;
Fig. 2 be in Fig. 4 the II-II plane cutting and along the schematic diagram shown in the direction of transfer according to second preferred embodiment of equipment of the present invention;
Fig. 3 be in Fig. 1 the III-III plane cutting and about the schematic cross section according to the equipment of first embodiment of direction of transfer;
Fig. 4 be in Fig. 2 the IV-IV plane cutting and about the schematic cross section according to the equipment of second embodiment of direction of transfer;
Fig. 5 is the tangent plane of corresponding diagram 3 and 4 and about the schematic cross section according to the equipment of the 3rd embodiment of direction of transfer;
Fig. 6 A-6C shows the distribution of temperature on the parts of veneer and both sides thereof that is caused by the present invention of corresponding adjacent accompanying drawing 3,4 and 5, be the temperature distributing profile between higher first temperature and lower second temperature, wherein first temperature is two different temperature with second temperature.
The specific embodiment
The equipment that is used for the wood single-plate of contact drying of rotary-peeled or cutting comprises first belt component 3 and second belt component 4.First belt component 3 comprises that first metal tape, 1, the second belt component 4 comprises at least the second metal tape 2.These belt components 3 and 4 are configured to utilize this equipment to carry out dry wood single-plate 5 and are received between them.For this reason, belt component 3 and 4 extends in parallel certain-length, and the interval is corresponding to the interval S 3 of the thickness S2 of veneer." wood single-plate " or " veneer " refers to the thinly-sliced timber panel that rotary-cut (being helical cut) goes out from the log, perhaps the thin slicewood panel that parallel cutting (being slicing) goes out from the log.Therefore in both cases, timber is by the blade cut of the cutting edge with free of discontinuities/continuous, utilize this cutting edge cut down can with substantially not the mode of waste material obtain veneer from timber, this is different from the situation of using saw on principle, a large amount of independent small blades is removed material with the form of chip or sawdust between the end product when using saw.Because the rotary-cut method can produce the bigger wood single-plate of surface area, so its use is more general.Should note: the present invention does not relate to the drying to the product that is sawn into.Wood single-plate is used to make glued board or laminated veneer lumber, wherein the grain direction in the wood single-plate can be vertical mutually, perhaps the grain direction in the wood single-plate can be parallel, grain direction in the wood single-plate can be 90 degrees to each other to the angle between 0 degree, and perhaps the structure of wood veneer/laminated veneer lumber can be their combination.The thickness of wood single-plate and size change according to timber type and required purposes, but its maximum is generally 8mm and is generally 2.5mm-5mm when being used for laminated veneer lumber, and its maximum is generally 5mm and is generally 1.5mm-4mm when being used for glued board.The wood single-plate of slicing (i.e. cutting) usually can be thinner, such as being 0.5mm.This equipment also comprises: heater 11, and it is used at least the first metal tape 1 is heated to first temperature T 1; And pressurizing unit, it is used between the described period of heating first belt component 3 and second belt component 4 being pressed to the other side, this moment wood single-plate 5 between two belt components pressure P that is squeezed.
According to the present invention, except described second metal tape 2, second belt component 4 also comprises at least one porous grating 6 or the porous surface part 8 in second metal tape 2.Porous member (i.e. first grating 6) and porous surface part 8 these two kinds of selectable unit (SU)s are inserted between second metal tape 2 and the wood single-plate 5.Be stressed that also then it is between second metal tape and wood single-plate, as shown in Figure 3 if this equipment comprises first grating 6; If this equipment comprises porous part 8 on the surface of second metal tape 2, then it is between second metal tape and wood single-plate, as shown in Figure 4.According to the present invention, this equipment comprises special cooling device 12, and it is used for the temperature difference that second metal tape 2 remains between second temperature T, 2, the second temperature and described first temperature T 1 (i.e. the temperature of first metal tape) is about Δ T.Described temperature difference Δ T is at least 60 ℃, 80 ℃ or 100 ℃.Above-mentioned first temperature T 1 correspondingly is at least 120 ℃, and mostly is 210 ℃ most.Timber type and the glued board made from veneer and the desirable characteristics of laminated veneer lumber influence the selection of first temperature in described temperature range.According to the present invention, the maximum of above-mentioned second temperature T 2 is 50 ℃ or 30 ℃.In this case, the temperature difference T1-T2=Δ T between first and second temperature is at least 60 ℃, 80 ℃ or 100 ℃.Basically, the temperature difference Δ T between first temperature T 1 and second temperature T 2 is big more, and the drying to wood single-plate then according to the present invention is effectively more.Temperature difference only is subjected to the restriction of following factor: the timber thermal resistance, and how low temperature can realize economically reasonably cooling.In fact, even can use the temperature difference Δ T also bigger, such as 130 ℃, 160 ℃ or even 180 ℃ than said temperature difference.
The above-mentioned heater 11 that is used to heat first metal tape 1 can have several implementations.At first can adopt hot pressurized chamber 18, its wall is formed by the described first mobile metal tape 1.Other wall 38 of hot pressurized chamber 18 is normally fixed.For example in chamber shape very under the situation near parallelepiped, in this way, side that hot pressurized chamber is formed along its surface direction by five fixing walls and movable or first belt component 3 that moves and first metal tape 1 or wall define and form, and this can recognize from Fig. 1 and 3.Can certainly use difform hot pressurized chamber.The high-temperature medium F1 of pressurization is in the pressurization indoor circulation that is formed by this mode, and its temperature is the formed first temperature T 1+ ε 1 of first metal tape.Obviously, between metal tape and high-temperature medium, have the small temperature difference ε 1 that causes by the heat conduction, but it usually can be ignored.Say that exactly the temperature of the high-temperature medium F1 of pressurization is higher than the predetermined temperature of first metal tape and differs the first difference ε 1, the temperature that is to say medium F1 is T1+ ε 1.Perhaps can adopt rigidity high temperature piece 19, this moment, first belt component 3 and first metal tape 1 moved along an outer surface of described high temperature piece, and this can recognize from Fig. 2 and 4.High temperature piece 19 has the cable 20 of medium flexible pipe or electric wire form, thereby high-temperature medium F1 or electric current E circulate generation temperature T 1+ ε 2 in described high temperature piece 19 within it, and it produces temperature T 1 on first metal tape.Generally speaking, the second small temperature difference ε 2 is slightly larger than previously described first temperature difference ε 1, because high temperature piece itself is just in heat conduction path, and exists contacting of metal tape and high temperature piece and to cross over.In the end among the embodiment of Miao Shuing, because the conduction of the heat between high-temperature medium and the high temperature piece, the actual temperature height than high temperature piece 19 of the temperature of high-temperature medium F1 is T2+ ε 2.
It is to be understood that the combination that to adopt hot pressurized chamber 18 and cold pressurized chamber 28, as shown in Figure 3; The perhaps combination of rigidity high temperature piece 19 and rigidity cold block 29, as shown in Figure 4; The perhaps combination of hot pressurized chamber 18 and rigidity cold block 29; The perhaps combination of rigidity high temperature piece 19 and cold pressurized chamber 28, as shown in Figure 5.
This equipment comprises control module 9, and it is used for moving first belt component 3 and second belt component 4 continuously or intermittently with identical speed V between aforementioned hot pressurized chamber or high temperature piece and cold pressurized chamber or cold block.At first belt component that has first metal tape 1 and second metal tape 2 and second belt component when moving between hot pressurized chamber or high temperature piece and relative cold pressurized chamber or the cold block, squeeze pressure P is applied on the belt component by these chamber/parts, be applied on the wood single-plate 5 between the metal tape via metal tape 1,2 then.By hot pressurized chamber or high temperature piece and relative cold pressurized chamber or cold block in the belt component direction, be that the zone that limits on the direction of speed V is referred to as dry section DZ, wherein, when described squeeze pressure is applied on belt component and the metal tape thereof, have metal tape 1,2 belt component 3,4 is advanced betwixt.Control module 9 includes in all embodiments: a series cylinder 21 that is twined by first metal tape 1 of first belt component 3 and at least by second series cylinder 22 of second metal tape, 2 windings of second belt component 4 at least.Also have the 3rd series cylinder 23 that first grating 6 by porous twines according to the first embodiment of the present invention, this can see in Fig. 1.Embodiment among Fig. 1 also has second grating 7, and it is advanced between first grating 6 and wood single-plate in dry section DZ; Perhaps second may embodiment in, between the porous surface region 8 of second metal tape and wood single-plate 5, advance.Second grating 7 that may exist passes the 4th series cylinder 24.In according to a second embodiment of the present invention, comprise that second metal tape 2 of porous surface part 8 twines second series cylinder 22.The control module type can be generally to know or newly occur and be suitable for this purpose, therefore will no longer be further explained them.
Used absorption condensation water and with its band from first screening with 6 first embodiment in, this equipment also comprises the drier 34 that is used for second metal tape 2 and is used for one or more driers 35 and/or 36 of porous grating.For example, the drier 34 that is used for second metal tape is scraper, its be used for from second metal tape 2 among dry section DZ, remove excessive moisture on the outside of dry section DZ towards the surface of wood single-plate, it separates and first grating 6 has described excessive moisture when also separating with second metal tape 2 at second belt component 4 and desiccated wood veneer.In this embodiment, because the wood single-plate that separates and the influence of low temperature second metal tape, most of condensed water is all on described second grating.Second grating 7 that may exist is used as the first moist grating and the separator of desiccated wood veneer, and only wishes that moisture passes through it.First grating 6 of porous has the drier 35,36 of oneself, and it advantageously is a low-pressure suction equipment, promptly be used for absorbing water from the hole of grating 6, after this first grating 6 again adsorption moisture with the desiccated wood veneer.Drier 35, however 36 can be quite effectively simple, because first grating 6 is ventilative together with second grating of explaining subsequently 7, can carry out drying by osmosis in this case.Second grating 7 that may exist can be used with the similar drying device of dry first grating next dry, perhaps according to the structure of grating, can not carry out drying and handle, separate with the desiccated wood veneer because the main task of second grating is maintenance absorption and first grating 6 of taking away condensed water to it.Therefore second grating 7 plays the effect of isolator.Because it also must see through the moisture from wood single-plate, therefore be fit to do it more more sparse or allow it have the hole bigger than first grating.Therein absorb and the surface of second metal tape that the band condensed water leaves on used among second embodiment of porous surface part 8, this equipment also comprises the drier 17 of the surface portion that is used for the second metal belt, it uses the moisture in the hole that removes porous surface part 8, and after this surface portion 8 of second metal tape can absorb moisture with the new wood single-plate of drying.Because the problem of coating can not equally with grating make its drying by the air penetration effect.Therefore, drier 17 can be made of evaporimeter 32 and the low-pressure suction that may exist in addition equipment 33, and wherein said evaporimeter 32 heating metal strips and surface portion thereof are with the moisture in the evaporation hole, and described pumping equipment 33 is removed moisture evaporated.This drier can be other known any type itself, or is suitable for the newtype of this purpose.
According to the present invention, utilize described hot pressurized chamber 18 and/or cold pressurized chamber 28 and/or high temperature piece 19 and/or cold block to apply squeeze pressure P to wood single-plate 5, described pressure P is at least 20kPa and is 500kPa to the maximum.These pressurizing units are embodied as one of following alternate ways:
Hot pressurized chamber 18 and cold pressurized chamber 28 all have default overvoltage Φ at medium F1 described in these compression chambers and F2 toward each other, and it forms described squeeze pressure P on veneer; Perhaps
Rigidity high temperature piece 19 and rigidity cold block 29 and are arranged on the veneer pressing mechanism 23 that forms described squeeze pressure P toward each other; Perhaps
Hot pressurized chamber 18 and rigidity cold block 29 are toward each other.Wherein high-temperature medium F1 has a default overvoltage Φ in that high-temperature pressurizing is indoor, and it forms described squeeze pressure P on veneer; Perhaps
Rigidity high temperature piece 19 and cold pressurized chamber 28 toward each other, wherein cryogenic media F2 has default overvoltage Φ in cold pressurized chamber, it forms described squeeze pressure P.
According to the method, the wood single-plate 5 of rotary-cut or cutting is touched drying in the following manner.In the method, green wood veneer 5 with undried of greenwood water content RH1 is admitted between first belt component 3 and second belt component 4 and with them and contacts, described first belt component 3 comprises that first metal tape, 1, the second belt component 4 comprises second metal tape 2 and at least one porous grating 6 or porous surface part 8.Belt component 3,4 and first series cylinder 21 and at least the second series cylinder are put together, and this can figure out in Fig. 1 and 2, and simultaneously usually with the arranged in form veneer 5 of sheet material.Porous grating 6 or similar porous surface part 8 that belt component is configured to second metal tape are between second metal tape and the wood single-plate.In withering process, first belt component 3 moves with identical speed V continuously or off and on second belt component 4.Belt component is same moved further therefore, and may together slowly move the wherein said thickness S2 that equals wood single-plate 5 apart from S1 each other along the belt longitudinal direction at a distance of S1 ground at least on dry section DZ.Before in dry section DZ, implementing drying according to the present invention, wood single-plate 5 has greenwood water content RH1, and this can be natural humidity amount, and perhaps this humidity amount is by becoming big with veneer humidification to required numerical value, perhaps the most common ground, this humidity amount is improved on the highland as far as possible.Timber and therefore the natural moisture amount in the wood single-plate can be because of timber variety, wood grows ground, the timber clipping time of different with condition of storage obviously differences with the transportation of timber (log that promptly collects from forest).In addition, the water content in the single log (being the humidity of heartwood and sapwood) can be obviously different.Should be specifically noted that the following fact, promptly herein, the percentage of moisture RH1 and RH2 is meant the dry matter weight in the described timber of moisture weight ratio in the timber, the i.e. percentage of moisture weight ratio dry quantity.Therefore, for example RH1=40% means that when adiabatic drying weight is the moisture that 40kg is arranged in the timber of 100kg, and 100% moisture means to do in the matter at the timber of 100kg moisture of 100kg or the like.Can add wet process to log by for example before rotary-cut or cutting veneer, log being immersed in to come in the water.The purpose of soaking is to allow abundant moisture infiltrate in the timber so that cell and space between cells are full of moisture, support timber in cutting/rotary-cut process, so timber can not break because of cutting.Thus, the moisture in the veneer arrives peak after by rotary-cut, so water content RH1 maximum, perhaps-naturally considers to have loss-approaching maximum.
In dry section, comprise the belt component of its structure member and the residing position of veneer from the high temperature side to the low temperature side according to following order: second metal tape of first grating 6 of the porous of the second grating 7-, second belt component 4 that the first metal tape 1-wood single-plate 5-of first belt component 3 may exist or the porous surface of second metal tape 8 part-second belt component 4.In this dry section DZ, first metal tape 1 is heated to first temperature T 1, and simultaneously second metal tape 2 keeps low temperature, promptly is in second temperature T 2, is about Δ T than low T2 of first temperature and the temperature difference amount between described first temperature.Therefore at least with first metal tape 1 proportionately with cooling second metal tapes 2 such as for example water.At this dry section DZ and therefore in described heating process, with metal tape 1,2 press to the other side, one of them is in temperature T 1 and another keeps low temperature to be in temperature T 2, and therefore the wood single-plate between them receives squeeze pressure P from described first metal tape and described grating or surface portion.In addition, in this dry section DZ, the moisture in the wood single-plate 5 is owing to wood single-plate is left in the effect of first temperature T 1, and owing to the effect of second temperature T 2 condensation takes place and by band from first grating 6 or surface portion 8.These processes that take place in dry section DZ are carried out substantially synchronously, and with the motion of belt component be continuously or intermittently irrelevant.Therefore in dry section, form the veneer 5 that is dried, wherein moisture left described dried single board 5 and since action of thermal difference be with from first grating 6 or surface portion 8.The squeeze pressure P that keeps synchronous generation has further improved the durability of the veneer that is dried.
Then, between first belt component 3 and second belt component 4, promptly from dry section DZ, take out and obtain dry wood single-plate 5 in this way.After wood single-plate 5 takes out between first belt component 3 and second belt component 4, as previously explained, by strigil K and/or utilize low-voltage vacuum S1 that described second metal tape 2 and at least one porous grating 6 or surface portion 8 are carried out drying processing.First belt component 3 and second belt component 4 are allowed to get back to wherein previously described new green wood veneer 5 and are admitted to stage between them, so described contact drying intermittently or carry out continuously.In other words, belt component 3,4 moves past dry section DZ, and carries the veneer that carries out drying according to the present invention.Usually the control module 9 that has only second belt component comprises movable agency in that series cylinder 21 of first belt component 3 or that series cylinder 22 at second belt component because second belt component 4 or 3 and other object as veneer so together move.Advantageously, the final water content RH2 that obtains dry wood single-plate according to the present invention is lower than 12%, and therefore its moisture concentration is also calculated according to the weight of drying material.
Generally speaking, job step of the present invention is as follows: will cut/slicing or rotary-cut and moist sheet of veneer send into the extruding drier that wherein has high temperature upper surface and low temperature lower surface in the both sides of wood single-plate.Veneer is subjected to the extruding of slight but enough squeeze pressures between described surface.The upper surface of high temperature is normally smooth, and the lower surface of low temperature is provided with and is used for dewatered groove or anchor net.In addition, can utilize vacuum more effectively to remove moisture on the lower surface.When having the obvious temperature difference between these surfaces, moisture can condense on the lower surface of drier.In this way, in timber, have a considerable amount of moisture to be removed, thereby these moisture of while can not seethe with excitement and violent the expansion caused damage to veneer.Yet, the heating of wood single-plate has been improved the evaporating pressure of the moisture in the veneer, therefore moisture is attempted moving to the lower zone of evaporating pressure, is on the surface portion of first grating of porous or second metal tape, then herein owing to the influence of low temperature, promptly condense when temperature is lower than dew point.In brief, because the influence of first temperature T 1, moisture leaves wood single-plate 5 with the form of steam, condenses in another place under the influence of second temperature T 2 then, and is discharged from by first grating or surface portion are separated with dried single board at last.
This new method allows dry in a different manner each sheet of veneer, and perhaps will link up consistent veneer or sheet of veneer are divided into the part that can be organized the position drying model.For this reason, under the situation of continuous process, for example can little by little regulate transfer rate V by dry section DZ; Perhaps under the situation of intermittent process, for example can set the time that sheet of veneer is spent in dry section according to each independent veneer.In the continuous action process, wood single-plate moves past dry section with the speed V of standard or variation; And in the intermittent action process, wood single-plate moves into dry section with a certain speed V, and stops the scheduled time there, leaves with a certain speed V then.In this way, can accurately dry the veneers to needed moisture level.Thus, the response characteristic that is used for the glue of veneer can obtain improvement and the gummed process becomes more effective.Produce higher average durability like this and reduced and dispersed.Both have all improved the characteristic durability of product.In addition, the gross porosity lower surface that is caused by cutting check in the rotary-cut process can become tightr.This helps to influence the feature of the rolling shear strength on the veneer surface direction.
Claims (18)
1. method, it is used for the wood single-plate of contact drying of rotary-peeled or cutting, and the greenwood veneer that therefore has greenwood water content (RH1) is heated, and is squeezed simultaneously, and the therefore wood single-plate that obtains being dried is characterized in that:
Described greenwood veneer (5) is admitted between first belt component (3) and second belt component (4) and with them and contacts, first belt component comprises first metal tape (1), and second belt component comprises second metal tape (2) and is at least one porous grating (6) between second metal tape and the wood single-plate or porous surface part (8);
First metal tape (1) is heated to first temperature (T1), and second metal tape (2) is cooled to second temperature (T2), and described second temperature (T2) is than described first temperature (T1) low temperature poor (Δ T);
During described heating and cooling, belt component (3,4) is pushed toward each other, so on squeeze pressure (P) is applied to wood single-plate between them from described first metal tape and described grating or surface portion;
Be allowed under the effect of second temperature, condense in described grating (6) or the described surface portion (8) at the moisture that separates with wood single-plate (5) under the effect of first temperature; And
From taking out the wood single-plate (5) that is dried between first belt component (3) and second belt component (4).
2. the method for claim 1 is characterized in that, described temperature difference (Δ T) is at least 60 ℃, at least 80 ℃ or at least 100 ℃.
3. method as claimed in claim 1 or 2 is characterized in that, described first temperature (T1) is at least 120 ℃ and mostly be 210 ℃ most; Described second temperature (T2) mostly is 50 ℃ or 30 ℃ most.
4. as claim 1,2 or 3 described methods, it is characterized in that described squeeze pressure (P) is for 20kPa at least and be 500kPa to the maximum.
5. each described method in the claim as described above is characterized in that, the greenwood water content (RH1) of described wood single-plate be by before rotary-cut or cutting veneer with the log humidity that obtains under water.
6. method as claimed in claim 5 is characterized in that, described greenwood water content (RH1) is high as much as possible; And the described wood single-plate that is dried (5) has the final water content (RH2) less than 12%.
7. each described method in the claim as described above, it is characterized in that, between first belt component (3) and second belt component (4), taking out wood single-plate (5) afterwards, described second metal tape (2) and described at least one porous grating (6) or porous surface part (8) are being carried out drying by strigil (K) and/or low-pressure suction.
8. method as claimed in claim 7, it is characterized in that, described first belt component (3) and described second belt component (4) are allowed to get back to wherein new described greenwood veneer (5) and are admitted to stage between them, so intermittent or carry out described contact drying continuously.
9. each described method in the claim as described above is characterized in that in dry run, first belt component (3) does not have to move with identical speed (V) discontinuously with second belt component (4).
One kind be used for contact drying of rotary-peeled or the cutting wood single-plate equipment, described equipment comprises:
First belt component (3) and second belt component (4), wherein first belt component comprises first metal tape (1), and second belt component comprises second metal tape (2), and described belt component is arranged to wood single-plate (5) is placed therebetween;
Heater block (11), it is used at least the first metal tape (1) is heated to first temperature (T1);
Pressurizing unit, it is used in described heating process first belt component (3) and second belt component (4) being pushed toward each other, then squeeze pressure (P) is applied on the wood single-plate that is between them,
It is characterized in that described equipment also comprises:
Except second metal tape (2), second belt component also is included at least one porous grating (6) or the porous surface part (8) between second metal tape and the wood single-plate;
Cooling-part (12), it is used for second metal tape (2) is maintained second temperature (T2), and the amount that described second temperature (T2) is lower than described first temperature (T1) is temperature difference (Δ T);
Control module (9), it is used for moving first belt component (3) and second belt component (4) with identical speed (V).
11. equipment as claimed in claim 10 is characterized in that, described heater block (11) is:
Hot pressurized chamber (18), its a wall is formed by described first metal tape (1), and in described pressurization indoor circulation, described temperature (T1+ ε 1) produces first temperature (T1) to high-temperature pressurizing medium (F1) on first metal tape with temperature (T1+ ε 1); Perhaps
Rigidity high temperature piece (19), described first metal tape (1) is along a lateral surface motion of this high temperature piece (19), and this high temperature piece has cable (20), high-temperature medium (F1) or electric current (E) circulate in described cable, thereby produce temperature (T1+ ε 2) in described high temperature piece (19), described temperature (T1+ ε 2) produces first temperature (T1) on first metal tape.
12. equipment as claimed in claim 10 is characterized in that, described cooling-part (12) is:
Cold pressurized chamber (28), its a wall is formed by described second metal tape (2), and in described pressurization indoor circulation, described temperature (T2-ε 3) produces second temperature (T2) to cryogenic media (F2) on second metal tape with temperature (T2-ε 3); Perhaps
Rigidity cold block (29), described second metal tape (2) moves along a lateral surface of this cold block, and this cold block has passage (30), cryogenic media (F2) circulates in described passage, thereby produce temperature (T2-ε 4) in described cold block (29), described temperature (T2-ε 4) produces second temperature (T2) on second metal tape.
13., it is characterized in that described control module (9) comprising as claim 10,11 or 12 described equipment:
First series cylinder (21) by first metal tape (1) winding;
Second series cylinder (22) by second metal tape (2) winding; And
The 3rd series cylinder (23) by porous grating (6) winding.
14. equipment as claimed in claim 13 is characterized in that, one or more driers (35 and/or 36) that described equipment also comprises the drier (34) that is used for second metal tape and is used for the porous grating; And the drier (34) that is used for second metal tape is a strigil, and the drier (35,36) that is used for the porous grating is a low-pressure suction equipment.
15., it is characterized in that described control module (9) comprising as claim 10,11 or 12 described equipment:
First series cylinder (21) by first metal tape (1) winding; And
Second series cylinder (22) by second metal tape (2) winding that has porous surface part (8).
16. equipment as claimed in claim 15 is characterized in that, described equipment also comprises the drier (17) of the surface portion that is used for second metal tape; And the drier (17) that is used for the surface portion of second metal tape is the evaporimeter (32) and the low-pressure suction equipment (33) that may exist in addition.
17., it is characterized in that described pressurizing unit comprises one of following alternative as each described equipment among the claim 10-18:
Hot pressurized chamber respect to one another (18) and cold pressurized chamber (28), described two media (F1 and F2) has default overvoltage (Φ) in the compression chamber, and this is crossed to be pressed in and forms described squeeze pressure (P) on the veneer; Perhaps
Rigidity high temperature piece respect to one another (19) and rigidity cold block (29), and the pressing mechanism that is associated with them (23), described mechanism is provided in and forms described squeeze pressure (P) on the veneer; Perhaps
Hot pressurized chamber respect to one another (18) and rigidity cold block (29), so the indoor high-temperature medium (F1) of high-temperature pressurizing has default overvoltage (Φ), this is crossed to be pressed in and forms described squeeze pressure (P) on the veneer; Perhaps
Rigidity high temperature piece respect to one another (19) and cold pressurized chamber (28), so the cryogenic media (F2) in the cold pressurized chamber has default overvoltage (Φ), this is crossed to be pressed on the veneer and forms described squeeze pressure (P).
18. as each described equipment among the claim 10-18, it is characterized in that: it also comprises second grating (7), described second grating (7) is advanced between first grating (6) and wood single-plate (5), perhaps advances between the porous surface of second metal tape part (8) and wood single-plate (5).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20060474 | 2006-05-15 | ||
| FI20060474A FI118824B (en) | 2006-05-15 | 2006-05-15 | Method and apparatus for contact drying of turned or plan cut wood boards |
| PCT/FI2007/000128 WO2007132057A1 (en) | 2006-05-15 | 2007-05-11 | Method and apparatus for contact drying of rotary-peeled or cut wood veneers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101443617A true CN101443617A (en) | 2009-05-27 |
| CN101443617B CN101443617B (en) | 2011-11-23 |
Family
ID=36539919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200780017588XA Active CN101443617B (en) | 2006-05-15 | 2007-05-11 | Method and apparatus for contact drying of rotary-peeled or cut wood veneers |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2018507B1 (en) |
| CN (1) | CN101443617B (en) |
| BR (1) | BRPI0711831B1 (en) |
| FI (1) | FI118824B (en) |
| RU (1) | RU2438082C2 (en) |
| WO (1) | WO2007132057A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010016662A1 (en) * | 2010-04-27 | 2011-10-27 | Ralf Pollmeier | Method for contact drying of wood veneers |
| FI128812B (en) | 2018-01-23 | 2020-12-31 | Teknologian Tutkimuskeskus Vtt Oy | Coated wood veneer and method for treating wood veneer |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT233508Y1 (en) * | 1994-06-17 | 2000-01-28 | Cremona Lorenzo | DRYING DEVICE WITH PERFECT GUIDE FOR SHEETS OF WOOD |
| FI104275B (en) | 1998-02-18 | 1999-12-15 | Valmet Corp | Method and apparatus for drying a fibrous web |
| CN2366809Y (en) * | 1999-02-05 | 2000-03-01 | 南京林业大学 | Continuous and contact type drying equipment for single wood plate rolling and softening |
| DE10329832A1 (en) | 2003-07-02 | 2005-01-20 | Helmut Rein | Contact drying process for wood veneers involves use of completely smooth heat-transfer contact surface |
-
2006
- 2006-05-15 FI FI20060474A patent/FI118824B/en active
-
2007
- 2007-05-11 RU RU2008148157/06A patent/RU2438082C2/en active
- 2007-05-11 EP EP07730597.7A patent/EP2018507B1/en active Active
- 2007-05-11 WO PCT/FI2007/000128 patent/WO2007132057A1/en active Application Filing
- 2007-05-11 BR BRPI0711831A patent/BRPI0711831B1/en active IP Right Grant
- 2007-05-11 CN CN200780017588XA patent/CN101443617B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| BRPI0711831A2 (en) | 2011-12-13 |
| RU2438082C2 (en) | 2011-12-27 |
| EP2018507B1 (en) | 2017-08-30 |
| RU2008148157A (en) | 2010-06-20 |
| BRPI0711831B1 (en) | 2019-01-29 |
| WO2007132057A1 (en) | 2007-11-22 |
| CN101443617B (en) | 2011-11-23 |
| FI20060474A (en) | 2007-11-16 |
| EP2018507A4 (en) | 2016-01-27 |
| FI118824B (en) | 2008-03-31 |
| EP2018507A1 (en) | 2009-01-28 |
| FI20060474A0 (en) | 2006-05-15 |
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