EP2018507B1 - 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 PDF

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Publication number
EP2018507B1
EP2018507B1 EP07730597.7A EP07730597A EP2018507B1 EP 2018507 B1 EP2018507 B1 EP 2018507B1 EP 07730597 A EP07730597 A EP 07730597A EP 2018507 B1 EP2018507 B1 EP 2018507B1
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EP
European Patent Office
Prior art keywords
belt
temperature
metal belt
veneer
metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP07730597.7A
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German (de)
English (en)
French (fr)
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EP2018507A4 (en
EP2018507A1 (en
Inventor
Matti Kairi
Pekka Ahtila
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aalto Korkeakoulusaatio sr
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Aalto Korkeakoulusaatio sr
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Publication date
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Publication of EP2018507A1 publication Critical patent/EP2018507A1/en
Publication of EP2018507A4 publication Critical patent/EP2018507A4/en
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Classifications

    • 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
    • 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
    • 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
    • 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 goods
    • F26B2210/14—Veneer, i.e. wood in thin sheets

Definitions

  • the invention primarily relates to a method for contact drying of rotary-peeled or cut wood veneers in which method fresh veneer, having a green moisture content, is heated while at the same time it is pressed whereby the result is dried veneer.
  • the invention also relates to an apparatus for contact drying of rotary-peeled or cut wood veneers, which apparatus comprises a first belt assembly and a second belt assembly, of which the first belt assembly comprises a first metal belt, and the second belt assembly comprises at least a second metal belt whereby the belt assemblies have been arranged to receive wood veneers between them; heating means to heat at least the first metal band to the first temperature; and compressing means to press the first belt assembly and the second belt assembly towards each other during said heating in which case the wood veneer between them is pressed.
  • a roller dryer i.e. a hot-air drier that works according to the feed-through principle and based on convection is commonly used in drying veneer. It works such that hot air is blown through separate nozzle cases onto both surfaces of the veneer while it moves between the rollers from the front end of the drier to the back end.
  • the moisture i.e. water, travels from the veneer to the said hot air as gas and/or steam and disappears from the drying chamber with the hot air.
  • This kind of system for drying stiff and semi-stiff sheets of veneer is described in patent publication US 4,215,489 .
  • the method therein for drying veneers often causes water spots on the veneer because wood veneer is non-homogeneous with regard to both the concentration and discharge of the moisture.
  • the veneer must be 'over-dried' to nearly 0 % moisture, although the optimal value with regard to durability is an ultimate 6 % - 7 % moisture in relation to the dry matter. Veneer that is excessively dry is brittle and it becomes twisted in which case it is not durable enough for processing and the durability of the product to be made from it suffers.
  • plywood and laminated wood or other such products are made into layers by gluing veneers together, one on top of the other and at appropriate positions in relation to each other and other possible materials.
  • the moisture divergence of convection-dried veneers is significant, in which case the possibilities for glue manufacturers to develop their glues to be reactive in the desired and controlled way becomes more difficult.
  • Publication DE 103 29 832 A1 discloses a solution for drying wood veneers where the green veneer is fed between two transport chains comprising heated metal plates pressing against the green veneer.
  • the metal plates have gaps between them during the pressing stage, which allows moisture and water vapor escape from the veneer to the surrounding air.
  • Publication DE 25 27 433 discloses a solution for drying and/or joining of veneer, where the veneer is fed between two belt assemblies, where each belt assembly comprises a plurality of adjacent belts having gaps between them. These gaps allow the moisture and water vapor to escape to the surrounding air during the drying process.
  • Publication WO 99/42655 discloses a method and an apparatus for drying a fiber web, where the fiber web is fed between two endless bands impermeable to air, preferably made of metal, where one of the bands is heated and the other cooled.
  • the objective of the invention is to create a method and apparatus for drying wood veneers to achieve the desired amount of final moisture, which is as even as possible.
  • a further objective of the invention is to reduce the veneers' tendency to form peeling cracks, as well as to keep the changes in the veneer's volume at a minimal level during drying.
  • a further objective of the invention is to create dried veneers, which can be used to produce plywood and/or laminated wood with plausible durability properties.
  • the apparatus for contact drying rotary-peeled or cut wood veneers comprises a first belt assembly 3 and a second belt assembly 4.
  • the first belt assembly 3 comprises a first metal belt 1 and the second belt assembly 4 comprises at least a second metal belt 2.
  • These belt assemblies 3 and 4 are arranged to receive in between them wood veneers 5 which will be dried with this apparatus.
  • belt assemblies 3 and 4 run parallel at some lengths and at a distance S3 corresponding to the thickness S2 of the veneers.
  • "Wood veneer” or “veneer” refers to thinly cut wood panels that have been rotary peeled, i.e. spirally cut from a log or to thinly sliced wood panels that have been cut parallel, i.e. sliced from a log.
  • the wood is cut with a blade that has a uninterrupted/straight cutting edge with which slashes are made to produce veneers from the wood with essentially no waste material, which is a different principle than with sawing where a large number of small, separate blades remove the material in chips or sawdust from between the end products.
  • Rotary peeling is the more commonly used method because the method produces wood panels, which are larger in surface area. It should be noted that the present invention does not relate to the drying of sawed products.
  • Wood veneers are used to produce either plywood or laminated veneer lumber in which the direction of the grain in the wood veneers may be perpendicular against each other, or the direction of the grain in the wood veneers may be parallel, the direction of the grain in the wood veneers may form an angle between 90° and 0° in relation to each other, or the structure of the plywood/laminated veneer lumber may be a combination of these.
  • the thickness and size of the wood veneers varies according to the type of wood and needed use, but it is usually a maximum of 8 mm and typically 2.5 mm - 5 mm for laminated veneer lumber, and usually a maximum of 5 mm and typically 1.5 mm - 4 mm for plywood. Sliced, i.e.
  • the apparatus comprises heating means 11 to heat at least the first metal belt 1 to the first temperature T1, as well as compressing means to press the first belt assembly 3 and the second belt assembly 4 towards each other during the said heating, at which time the wood veneer 5 between them is subjected to compression pressure P.
  • the second belt assembly 4 comprises, in addition to the said second metal belt 2, at least one porous screen band 6 or a porous surface section 8 in this second metal belt 2.
  • the porous one i.e. the first screen band 6, as with the porous surface section 8, interpose the second metal belt 2 and the wood veneer 5.
  • the apparatus contains a first screen band 6, it is between the second metal band and wood veneer, as illustrated in Fig. 3 ; if the apparatus contains a porous section 8 on the surface of the second metal belt 2, it is between the second metal belt and the wood veneer, as illustrated in Fig. 4 .
  • the apparatus comprises particular cooling means 12 to keep the second metal belt 2 at the second temperature T2, which is about the amount of the difference in temperature ⁇ T lower than the said first temperature T1, i.e. the temperature of the first metal belt.
  • the said temperature difference ⁇ T is at least 60°C or at least 80°C or at least 100°C.
  • the above described first temperature T1 is accordingly at least 120°C and at most 210°C.
  • the type of wood and the desired characteristics of the plywood and laminated veneer lumber to be made from the veneers affect the choice of the first temperature within this said temperature interval.
  • the above-said second temperature T2 is a maximum of 50°C or a maximum of 30°C.
  • the greater the temperature difference ⁇ T between the first and second temperatures T1, T2 the more effective the drying of the wood veneer according to the invention will be.
  • This temperature difference is limited only by the heat resistance of the wood and to how low a temperature it is economically reasonable to cool it. In practice, it may be possible to use temperature differences ⁇ T even greater than those said above, such as 130°C, 160°C or even 180°C.
  • the above described heating means 11 for heating the first metal belt 1 can be embodied in several ways.
  • a hot pressurized chamber 18 can be used, the one wall of which is formed by the moving first metal belt 1 in question.
  • the other walls 38 of the hot pressurized chamber 18 are typically fixed.
  • the hot pressurized chamber is bordered by five fixed walls, for example, if the chamber is even close to the shape of a parallelopiped, as well as one side or wall in the direction of its surface formed by the moveable or moving first belt assembly 3 and first metal belt 1, as can be perceived from Figures 1 and 3 .
  • a differently shaped hot pressurized chamber may be used.
  • a pressurized hot medium F1 is circulated, the temperature of which is the first temperature T1 produced for the first metal belt T1+ ⁇ 1. It is clear that there is a slight difference in the temperatures ⁇ 1 of the metal belt and the hot medium arising from the heat transfer, but it can often be ignored. Precisely speaking, the temperature of the pressurized hot medium F1 is higher than the predefined temperature of the first metal belt and relatively equal to the first difference ⁇ 1, i.e. it is T1+ ⁇ 1.
  • a rigid hot block 19 can be used, along the one outer surface of which the first belt assembly 3 and the first metal belt 1 move, as can be perceived from Figures 2 and 4 .
  • the hot block 19 has cables 20, either hoses for the medium or electrical wires, in which the hot medium F1 or electric current E circulates creating the temperature T1+ ⁇ 2 in the said hot block 19, which produces the temperature T1 in the first metal belt.
  • this second small temperature difference ⁇ 2 is a little greater than the previously said first temperature difference ⁇ 1 because the there is a hot block in the heat transfer path itself and a crossover in the contact of the metal belt and the hot block.
  • the temperature of the hot medium F1 is actually higher than the temperature of the hot block 19, T2+ ⁇ 2, due to the transfer of heat between the hot medium and the hot block.
  • the cooling means 12 in accordance with the invention can be embodied in several ways.
  • a cold pressurized chamber 28 can be used, one wall of which is formed by the moving second metal belt 2.
  • the other walls 48 of the cold pressurized chamber 28 are typically fixed.
  • the cold pressurized chamber is bordered by five fixed walls, for example, if the chamber is even close to the shape of a parallelopiped, as well as one side or wall in the direction of its surface formed by the moveable or moving second belt assembly 4 and second metal belt 2, as can be perceived from Figures 1 and 3 .
  • a differently shaped cold pressurized chamber 28 may be used.
  • a pressurized cold medium F2 the temperature of which is the second temperature T2 produced for the second metal belt T2+ ⁇ 3, is circulated in the formed pressurized chamber. It is clear that there is a slight third temperature difference ⁇ 3 of the metal belt and the cold medium arising from the heat transfer, but it can often be ignored. Precisely speaking, the temperature of the pressurized cold medium F2 is lower than the predefined temperature of the second metal belt and relatively equal to the third temperature difference ⁇ 3, i.e. it is T2+ ⁇ 3.
  • a rigid cold block 29 can be used, the one outer surface of which the second belt assembly 4 and the second metal belt 2 move, as can be perceived from Figures 2 and 4 .
  • the cold block 29 has channels 30 in which the cold medium F2 circulates creating in the said cold block 29 the temperature T2- ⁇ 4 that produces the second temperature T2 in the second metal belt.
  • this fourth small temperature difference ⁇ 4 is a little greater than the previously said third temperature difference ⁇ 3 because the there is a cold block in the heat transfer path itself and a crossover in the contact of the metal belt and the cold block.
  • the temperature of the cold medium F2 is actually lower than the temperature of the cold block 29, T2- ⁇ 4, due to the transfer of heat between the cold medium and the cold block.
  • a combination of the hot pressurized chamber 18 and a cold pressurized chamber 28 can be used, as in Figure 3 , or a combination of a rigid hot block 19 and a rigid cold block 29, as in Figure 4 , or a combination of the hot pressurized chamber 18 and the rigid cold block 29, or a combination of the rigid hot block 19 and the cold pressurized chamber 28, as in Figure 5 .
  • the apparatus comprises control units 9 for moving first belt assembly 3 and second belt assembly 4 at the same velocity V, either constantly or intermittently, between the afore-said hot pressurized chamber or hot block and cold pressurized chamber or cold block.
  • compression pressure P is applied to the belt assemblies by means of these chambers/components and then to the wood veneer 5, between the metal belts, through the agency of metal belts 1, 2.
  • the control units 9 comprise, in all embodiments, a set of rollers 21 through which at least the first metal belt 1 of the first belt assembly 3 winds, and a second set of rollers 22 through which at least the second metal belt 2 of the second belt assembly 4 winds.
  • the first embodiment according to the invention also has a third set of rollers 23 through which the porous first screen band 6 winds as can be seen in Figure 1 .
  • the embodiment in Figure 1 also has a second screen band 7 that runs in between the first screen band 6 and the wood veneer at the point of the drying zone DZ; or, in the second possible embodiment, in between the porous surface section 8 of the second metal band and wood veneer 5.
  • This possible second screen band 7 runs through a fourth set of rollers 24.
  • the control units can be of any commonly known type or of a new type appropriate for the purpose, and therefore they will not be explained further.
  • the apparatus further comprises a drier 34 for the second metal belt 2 and a drier or driers 35 and/or 36 for the porous screen band.
  • the drier 34 for the second metal belt is, for example, a scraper with which the excess water on the outside of the drying zone DZ is removed from the surface of the second metal belt 2 that faces the wood veneer in the drying zone DZ, the excess water it has when the second belt assembly 4 is separated from the dried wood veneer and the first screen band 6 is also separated from the second metal belt 2.
  • most of the condensed water is on the said second screen band due to the influence of the separated wood veneer and the cold second metal belt.
  • the possible second screen band 7 functions as a separator for the wet first screen band and the dry wood veneer and the water is intended only to go through it.
  • the porous first screen band 6 has its own driers 35, 36 which are advantageously low-pressure suction apparatuses, i.e. to suck the water from the pores in the screen band 6 after which the first screen band 6 is able to take in water again for drying the wood veneer.
  • the driers 35, 36 can be rather simple but still efficient because the first screen band 6, as with the subsequently explained second screen band 7, permeate air in which case drying can be done through percolation.
  • the possible second screen band 7 can be dried with similar means used to dry the first screen band or, depending on the structure of the screen band, it can be left undried because the principle purpose of the second screen band is to keep the first screen band 6 that takes in and carries away condensed water separate from the dried wood veneer.
  • the second screen band 7 functions as an insulator. Since it must also permeate the moisture coming from the wood veneer well, it would be appropriate to make it more sparse or for it to have larger pores than the first screen band.
  • the apparatus further comprises a drier 17 for the surface section of the second metal belt with which water is removed from the pores of the porous surface section 8 after which the surface section 8 of the second metal band is able to take in water for drying a new wood veneer.
  • drier 17 may constitute an evaporator 32 that heats the metal belt and its surface section evaporating the water from the pores and, additionally, a possible low-pressure suction apparatus 33, which removes this evaporated water.
  • the driers can be of any other type, known as such, or of a new type, appropriate for the purpose.
  • compression pressure P which is at least 20 kPa and at the most 500 kPa, is applied to the wood veneer 5 using the said hot pressurized chamber 18 and/or the cold pressurized chamber 28 and/or hot block 19 and/or cold block.
  • These pressing means are embodied using one of the following alternatives:
  • rotary-peeled or cut wood veneers 5 are contact dried in the following way.
  • undried, green wood veneer 5, which has a green moisture content RH 1 is fed in between and placed in contact with the first belt assembly 3 that comprises the first metal belt 1, and the second belt assembly 4 that comprises the second metal belt 2, as well as at least one porous screen band 6 or the porous surface section 8.
  • the belt assemblies 3, 4 are brought together with the first set of rollers 21 and at least the second set of rollers, as can be perceived from Figures 1 and 2 , and the veneer 5 is placed at the same point usually in sheets.
  • the belt assemblies are such that the porous screen band 6 or similarly the porous surface section 8 of the second metal belt comes in between the second metal belt and the wood veneer.
  • the first belt assembly 3 and the second belt assembly 4 are moved at the same velocity V either intermittently or continuously during drying.
  • the belt assemblies thus synchronically move and possibly linger together at a distance S1 from each other equal to the thickness S2 of the wood veneer 5 in the longitudinal direction of the belts at least in the drying zone DZ.
  • the wood veneer 5 has a green moisture content RH1, which may be the natural amount of moisture or the amount has been increased by moistening the veneer to the desired value or, most commonly, the amount has been increased as high as possible.
  • the natural amount of moisture in wood and thus in wood veneer can vary considerably depending on the species of wood, the place the wood has grown, when the wood was cut and the transportation and storing conditions of the wood, i.e.
  • the percentage of moisture RH1 and RH2 refers to the weight of water in the wood in proportion to the dry substance weight in the wood in question, i.e. it is a question of the percentage of water weight in proportion to the amount of dry substance.
  • RH1 40% means 40 kg of water in the wood that weighs 100 kg when it is absolutely dry
  • 100 % moisture would mean 100 kg of water in 100 kg of wood-dry substance, etc.
  • the log can be moistened by soaking it in water, for example, before the veneer is rotary-peeled or cut.
  • water for example, before the veneer is rotary-peeled or cut.
  • the intention is to get so much water to seep into the wood that the cells and the space between the cells are full of water, something that supports the wood material during cutting/rotary peeling, whereupon the wood does not break by splitting.
  • the moisture in the veneer is as high as possible after having been rotary-peeled and therefore the moisture content RH1 is maximum or - taking into consideration, of course, possible loss - nearly maximum.
  • the belt assemblies, including their structural parts, and the veneer are situated in the following order from the hot side to the cold side: the first metal belt 1 of the first belt assembly 3 - wood veneer 5 - possible second screen band 7 - porous first screen band 6 of the second belt assembly 4 or the porous surface section of the second metal belt 8 - second metal belt of the second belt assembly 4.
  • the first metal belt 1 is heat to the first temperature T1 and, at the same time, the second metal belt 2 is kept cold, i.e. at the second temperature T2, which is about the amount of the difference in temperature ⁇ T lower than the said first temperature.
  • the second metal belt 2 is thus cooled with, for example, water, etc. at least in proportion to the first metal belt 1.
  • the wood veneer 5, dried in such a way is removed from between the first belt assembly 3 and the second belt assembly 4, i.e. from the drying zone DZ.
  • the said second metal belt 2 and at least one porous screen band 6 or surface section 8 said are dried by scraping K and/or with the low-pressure vacuum S1, as was previously explained.
  • the first belt assembly 3 and the second belt assembly 4 are permitted to return to the phase in which a new, green wood veneer 5 previously said is fed in between them whereupon the said contact drying takes places either intermittently or continuously.
  • belt assemblies 3, 4 move through the drying zone DZ and carry with them the veneer being dried according to the invention.
  • control units 9 for the second belt assembly either in the set of rollers 21 of the first belt assembly 3 or in the set of rollers 22 of the second belt assembly, comprise a moveable mechanism because the second belt assembly 4 or 3 moves along with the other just as the veneer.
  • the final moisture content RH2 of a wood veneer, dried according to the invention is advantageously under 12 %, the water concentration of which has thus been calculated from the weight of the dry material also.
  • the invention works as follows: a cut/sliced or rotary-peeled and wet sheet of veneer is fed into a compressing drier where there is a hot upper surface and a cold lower surface on opposite sides of the wood veneer.
  • the veneer is pressed with slight, but sufficient, compression pressure in between the surfaces.
  • the hot upper surface is typically smooth, and the cold lower surface is equipped with either grooving or bolting net for removing water. Additionally, the removal of the water on the lower surface can be made more effective using a vacuum. When there is a clear temperature difference between the surfaces, the water condensates onto the lower surface of the drier.
  • water is removed from the wood veneer 5 as steam due the influence of the first temperature T1, it is let to condensate in another place under the influence of the second temperature T2, and it is finally discharged by separating the first screen band or surface section from the dry veneer.
  • the new method allows the drying of each sheet of veneer in a different way or the dividing of consistent veneers or sheets of veneers into sections for which a positional drying model can be organized.
  • the conveyance velocity V through the drying zone DZ can be adjusted for example progressively, if the process is a continuous one, or the time the sheets of veneer spend in the drying zone can be set, for example according to each individual veneer, when the process is an intermittent one.
  • the wood veneer moves at a standard or varied velocity V through the drying zone; whereas in an intermittently functioning process, the wood veneer moves at some velocity V into the drying zone, stays there for a predefined time and it is then removed at some velocity V. In this way, it is possible to precision dry the veneers to the desired level of moisture.
  • the reactive features of the glue for the veneer can be developed and the gluing process made more efficient. This results in a higher average durability and a decrease in divergence. Both of these increase the characteristic durability of the product. Moreover, the coarse-meshed lower surface caused by the cutting checks during rotary peeling can be made denser. This helps in influencing the features of rolling shear strength in the direction of the veneer's surface.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Manufacture Of Wood Veneers (AREA)
EP07730597.7A 2006-05-15 2007-05-11 Method and apparatus for contact drying of rotary-peeled or cut wood veneers Active EP2018507B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20060474A FI118824B (fi) 2006-05-15 2006-05-15 Menetelmä ja laite sorvattujen tai leikattujen puuviilujen kosketuskuivaamiseksi
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 (3)

Publication Number Publication Date
EP2018507A1 EP2018507A1 (en) 2009-01-28
EP2018507A4 EP2018507A4 (en) 2016-01-27
EP2018507B1 true EP2018507B1 (en) 2017-08-30

Family

ID=36539919

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07730597.7A Active EP2018507B1 (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 (fi)
CN (1) CN101443617B (fi)
BR (1) BRPI0711831B1 (fi)
FI (1) FI118824B (fi)
RU (1) RU2438082C2 (fi)
WO (1) WO2007132057A1 (fi)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010016662A1 (de) * 2010-04-27 2011-10-27 Ralf Pollmeier Verfahren zur Kontakttrocknung von Holzfurnieren
FI128812B (fi) 2018-01-23 2020-12-31 Teknologian Tutkimuskeskus Vtt Oy Päällystetty puuviilu ja menetelmä puuviilun käsittelemiseksi

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
IT233508Y1 (it) * 1994-06-17 2000-01-28 Cremona Lorenzo Dispositivo di essicazione a guida perfezionata per sfogliati di legno
FI104275B (fi) * 1998-02-18 1999-12-15 Valmet Corp Menetelmä ja laitteisto kuiturainan kuivaamiseksi
CN2366809Y (zh) * 1999-02-05 2000-03-01 南京林业大学 木单板滚压柔化及连续式接触干燥设备
DE10329832A1 (de) 2003-07-02 2005-01-20 Helmut Rein Verfahren und Vorrichtung zur Trocknung von Holzfurnieren im Kontaktverfahren ohne Markierungen von Dampfabzugseinrichtungen auf den Holzfurnierflächen

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Also Published As

Publication number Publication date
CN101443617B (zh) 2011-11-23
CN101443617A (zh) 2009-05-27
EP2018507A4 (en) 2016-01-27
WO2007132057A1 (en) 2007-11-22
EP2018507A1 (en) 2009-01-28
RU2438082C2 (ru) 2011-12-27
BRPI0711831A2 (pt) 2011-12-13
BRPI0711831B1 (pt) 2019-01-29
FI20060474L (fi) 2007-11-16
FI20060474A0 (fi) 2006-05-15
FI118824B (fi) 2008-03-31
RU2008148157A (ru) 2010-06-20

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