EP2247418B1 - Verfahren und vorrichtung zur vorwärmung einer pressgutmatte im zuge der herstellung von holzwerkstoffplatten - Google Patents

Verfahren und vorrichtung zur vorwärmung einer pressgutmatte im zuge der herstellung von holzwerkstoffplatten Download PDF

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Publication number
EP2247418B1
EP2247418B1 EP08869105.0A EP08869105A EP2247418B1 EP 2247418 B1 EP2247418 B1 EP 2247418B1 EP 08869105 A EP08869105 A EP 08869105A EP 2247418 B1 EP2247418 B1 EP 2247418B1
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EP
European Patent Office
Prior art keywords
pressed material
material mat
several
continuous furnace
microwaves
Prior art date
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Application number
EP08869105.0A
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German (de)
English (en)
French (fr)
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EP2247418A1 (de
Inventor
Werner Hoffmann
Ulf KÖNEKAMP
Gernot Von Haas
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Dieffenbacher GmbH Maschinen und Anlagenbau
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Dieffenbacher GmbH Maschinen und Anlagenbau
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Priority to PL08869105T priority Critical patent/PL2247418T3/pl
Publication of EP2247418A1 publication Critical patent/EP2247418A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/24—Moulding or pressing characterised by using continuously acting presses having endless belts or chains moved within the compression zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
    • F26B17/026—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces the material being moved in-between belts which may be perforated
    • 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
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
    • 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

Definitions

  • the invention relates to a method according to claim 1 for preheating a pressed material mat scattered on an endless continuously circulating forming belt and a device according to claim 15 for preheating a pressed material mat scattered on an endless continuously circulating forming belt during the production of wood-based panels.
  • the microwave preheating units used are predominantly continuous furnaces. Since in the production of wood-based panels, the plate width is many times greater than the plate thicknesses, the microwaves are radiated perpendicular to the wood material plate plane. The plate widths are usually between 1200 and 3900 mm and the plate thicknesses at 30 to 150 mm. The generation of the microwaves takes place in microwave generators, in which the high-frequency modulation and the magnetron tubes are housed.
  • microwaves generated are guided by means of hollow waveguides to the actual heating cell in the production plant, wherein a hollow waveguide is necessary for each generator.
  • microwaves are branched coming from the individual generators and thus multiplied by the number of energy-carrying hollow waveguides, thus a narrow grid of feed points below and can be realized above the heating cell.
  • the feed into the heating cell takes place by means of round hollow waveguides, which are mounted vertically below and above the heating cell.
  • a measuring and control device is required, with which the phase angle of the microwave is tuned.
  • the microwave preheating device consists of a heating furnace formed as a continuous furnace, in which the feeding of the microwaves into the pressed material via successively arranged rod antennas with reflection screens, lying horizontally and transversely to the production direction above and / or below the material to be pressed are mounted within the heating cell, wherein the rod antennas are each assigned to the opposite surfaces of the material to be pressed reflection surfaces.
  • the supply of microwaves can continue to be done by means of hollow waveguide from the generators to the heating cell, due to the radiation characteristics of the rod antenna, usually no additional branching of the hollow waveguide coming from the generators is necessary, that is, the number of feed points corresponds to the number of generators.
  • For the transition from hollow waveguide to rod antenna specially developed waveguide transitions are used. This kind of preheating has indeed Proven in principle, but still suffers disadvantages in terms of the extensive space and the high power consumption of individual components.
  • Microwave heaters with a frequency band of 915 MHz are known, in which case the microwaves are introduced directly in the inlet gap (region of the tapered press nip in the inlet of a continuously operating press) in the pressed material mat.
  • problems have also shown by uncontrollable reflections on the steel strips in operation.
  • the state of the art lacks concrete statements regarding an optimum frequency range in connection with a necessary power consumption or radiation capacity and in conjunction with the necessary number of generators for heating a press material mat with differentiated properties at a given speed.
  • the exact equipment of the microwave device for this or that method is left to the skilled person (on site), data on the frequency are limited to the range microwave or contain sizes across several powers.
  • These statements do not give the person skilled in the art any indication of the implementation of a teaching with respect to these parameters from the patent literature concerning a optimally usable and useful frequency. It has been found that the skilled person has been virtually left alone and in a range of frequencies when using microwaves over several powers (3x10 2 MHz to 3x10 6 MHz) can decide which frequency could be chosen.
  • the object of the present invention is to provide a method and a device which makes it possible to provide a high efficiency for the heating of Pressgutmatten with a suitable frequency, wherein the heating is uniform and energetic as environmentally and economically as possible to make before This press material mat is pressed in a continuously operating press.
  • the method and the device make it possible to use components of lower power consumption.
  • the apparatus provided in this context is usable with the method as well independent functional and should have easily replaceable components and a high resistance to interference.
  • the solution for creating a method is that microwaves are used in a frequency range of 2400 - 2500 MHz for heating the press mat, the microwaves for each press surface side from 20 to 300 microwave generators with a respective power of 3 to 50 kW are generated.
  • the solution for a device for carrying out the method or as an independent device is that 20 to 300 microwave generators with magnetrons of a power of 3 to 50 kW and with a frequency range of 2400 - 2500 MHz are arranged in a continuous furnace per press surface side.
  • the mat height is after pre-pressing in the MDF board production at 40 to 350 mm and in chipboard production at 30 to 200 mm.
  • Orientated scattered chipboard (OSB) can be used without pre-pressing in a height of 50 to 500 mm.
  • magnetrons with a power of 6 to 20 kW are particularly suitable for this frame data of the pressed material mat to be heated.
  • the frequency used is in the ISM (Industrial Science Medicine Band) band and is an internationally recognized and approval-free frequency band for microwaves.
  • the hitherto customary high-frequency devices have the disadvantage that a large amount of radiation comes out of the pressed material mat again or simply passes through without heating the pressed material mat. Therefore, reflectors must be arranged on the other side after the press material mat. Include extensive calculations for the best possible radiation and appropriate control and regulatory effort.
  • the microwave radiation has a through Calculation and corresponding experiments surprisingly shown that in a pre-compacted MDF press material mat or similar material, a penetration depth of about 200 mm at a frequency of 2450 MHz is present. In the OSB production, a pre-compaction is not provided.
  • the large number of generators that are necessary for the device and the method advantageously result in a small size of the radiation openings at the microwave frequency used. This is approximately at a 2 x 5 cm opening. For this reason, it is also possible to arrange a plurality of generators in width and in a small space.
  • the waveguide neck at the exit are preferably covered to be protected from a possible dust.
  • 930 MHz required much larger waveguide, so that a larger number of generators or waveguides over the width of a pressed material mat would not be buildable.
  • a microwave generator is preferably modular and can be easily disassembled on site into parts for repair or replacement.
  • a metal detector may be arranged to examine the pressed material mat before microwave heating to metallic parts.
  • metallic parts whose dimensions are greater in length than 1 ⁇ 4 of the wavelength (about 40 mm). Sparks during heating may cause fires in the pressed material mat. Since non-magnetic metal parts can also lead to such reactions and these can not be removed from the press material mat via a conventional magnetic separator, it must be possible to dispose of the press material mat for disposal before heating the press material mat, or the microwave generators are switched off when a detected piece of metal passes through and the discharge of the thus not heated Pressgutmatte can then be done shortly before the press. Nevertheless, it is necessary to check the passing pressed material mat for sparks or fires. This is done with conventional sensors and measuring technology. At the same time, means for extinguishing fires are advantageously present in the device or already integrated in the production hall on site.
  • ⁇ 2 corresponds to the efficiency of the magnetrons used in the microwave generators, which convert the high voltage into microwave radiation and ⁇ 3 is the efficiency of converting the microwave radiation into thermal power in the pressed material mat and corresponds to the temperature increase. In this case occur as a loss, for example, the leakage radiation, reflected power, the absorber power and the like.
  • ⁇ 3 could be determined in laboratory tests and depends to a great extent on the boundary conditions (eg plastic tapes) and the material to be heated.
  • the present material is a mixture of scattered fibers and / or chips which have been precompressed for venting and have a relatively low moisture content.
  • the forming belt has a greater width than the microwave belt used in the continuous furnace.
  • the latter is preferably made of Kevlar®. This circumstance results from the need to allow a very wide spread, which is then trimmed by 10-20%, since the edges of a scattered press mat usually have inhomogeneities such as scattering errors or unwanted increases in density. For example, a 2500 mm wide Pressgutmatte before the Enema in the pre-press at 2250 mm width trimmed. Accordingly, it is sufficient if the microwave band in the continuous furnace has a width of 2300 mm. This is advantageous in the necessary design of the sealing of edge radiations from the microwave generation in the continuous furnace.
  • absorption means or - elements which absorb the edge and scattered radiation.
  • the heating by means of the microwaves advantageously causes a uniform temperature distribution of +/- 7 ° C in the pressed material mat 14 over the length and width.
  • FIG. 1 is a production plant for the production of material plates from a Pressgutmatte 14 shown schematically in a side view. It consists in its main parts of one or more scattering stations 16, from which a Pressgutmatte 14 is continuously scattered in one or more layers on a forming belt 6.
  • a pre-press 17 consisting of an over the forming belt 6 endlessly circulating hold-down belt 19.
  • Niederhaltede may be arranged underneath an endless with circumferential guide belt 18.
  • a continuously operating press 1 is shown, which is designed as a double belt press with rotating steel bands 7 and heated press / heating plates 2.
  • the revolving steel belts 7 are compared to the press / heating plates 2 by means of rolling elements 5, for example, parallel to each other and endlessly guided rolling rods, supported.
  • the continuous furnace 4 is arranged immediately in front of the incoming steel strips 5 of the continuously operating press 1.
  • the pressed material mat 14 is passed for a passage through the continuous furnace 4 of the forming belt 6 on the lower plastic belt 11 and optionally clamped depending on the type and design of the continuous furnace 4 with a top circumferential plastic belt 8.
  • the absorber stones 25 arranged on both sides of the microwave generator 26 can be raised and lowered by means of the height adjustment 12 and are adjusted depending on the height of the pressed material mat passing through.
  • the height adjustment for the top circumferential plastic band 8 is not shown.
  • the task of the upper plastic belt 8 is to protect the continuous furnace 4 from increased dust formation by the pressed material mat 14 and to prevent the pressed material mat 14 from springing back to its original state during pre-compression through the pre-press 17 during transport. Also, the upper plastic band 8 can prevent escape of moisture during preheating.
  • Microwaveable mold or plastic bands 6, 8, 11 are characterized in that they only heat by about 10 ° in a passage through the range of the microwave generator 26. Suitable for this purpose, for example, a microwave band KEVLAR® with a one- or two-sided Teflon coating.
  • a simple device of the continuous furnace 4 is constructed as follows. At a lower frame 23 there is the circulation of the lower plastic belt 11 with associated drive 11. In this case, the mold belt 6 passes the Pressgutmatte 14 on the lower plastic belt 11. The gap between the two rotating endless belts can be bridged easily in a Pressgutmatte 14, otherwise means are provided which ensure that a pressed material mat 14 undamaged survives the transition to the lower plastic strip 11 of the continuous furnace 4.
  • a height adjustment 12 is arranged for the inlet 27 and outlet 28 of the continuous furnace 4 provided Absorbtionsieri 25 to properly shield the microwave radiation generated by the microwave generator 26 in order to preheat different heights of Pressgutmatten 14 can.
  • the inlet 27 and the outlet 28 can be adjusted in width.
  • This width adjustment and the height adjustment for the upper circumferentially arranged plastic belt 8 are not shown.
  • the absorption elements 25 can be designed, for example, as absorber stones or water containers.
  • reflectors such as perforated plates or other suitable means
  • the reflectors are arranged such that they reintroduce the scattered radiation directly into the pressed material mat 14.
  • sensors 29 can be arranged which detect the height and the width of the pressed material mat 14 and adjust the inlet 27 and the outlet 28 of the pressed material mat 4 accordingly.
  • a microwave generator 26 On the support frame 15, the microwave generator 26 are arranged in the middle of the continuous furnace 4.
  • a microwave generator 26 consists at least of a magnetron 20, an associated circulator 21 and a tuner 22.
  • the tuner 22 takes care of the fine adjustment of the microwave radiation or its orientation, whereas the circulator 21 receives retroreflective microwaves and feeds them to further use. In most cases, water from the water cooling 9 is heated to absorb the excess microwave radiation.
  • the metal detector of the device At 13, the metal detector of the device is shown. This can also be arranged depending on the design of the system directly above the forming belt 6 in front of the continuous furnace 4. Preferably, in this case, a discharge or a broaching possibility of an offset with metal pieces Pressgutmatte before the continuous furnace 4 is given.
  • the microwave generators 26 are briefly switched off during the passage of a piece of metal and the part of the pressed material mat 14, which has not been heated, over a short in the direction of production disposed of disposed in front of the press 1 drop.
  • the individual parts such as Magnetron 20, Circulator 21 and tuner 22, a microwave generator 26 modular build and provide for quick replacement in case of failure or maintenance.
  • each microwave generator 26 is constructed as a separate module in the continuous furnace 4 and possibly has quick-release closures for disassembly and assembly.
  • sensors for spark and / or fire detection in and / or on the pressed material mat 14 in or on the continuous furnace 4 and / or to provide means for extinguishing a fire.
EP08869105.0A 2007-12-30 2008-12-27 Verfahren und vorrichtung zur vorwärmung einer pressgutmatte im zuge der herstellung von holzwerkstoffplatten Active EP2247418B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08869105T PL2247418T3 (pl) 2007-12-30 2008-12-27 Sposób i urządzenie do podgrzewania maty z prasowanego materiału w trakcie wytwarzania płyt z tworzyw drzewnych

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007063374A DE102007063374A1 (de) 2007-12-30 2007-12-30 Verfahren und Vorrichtung zur Vorwärmung einer Pressgutmatte im Zuge der Herstellung von Holzwerkstoffplatten
PCT/EP2008/011122 WO2009083247A1 (de) 2007-12-30 2008-12-27 Verfahren und vorrichtung zur vorwärmung einer pressgutmatte im zuge der herstellung von holzwerkstoffplatten

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EP2247418A1 EP2247418A1 (de) 2010-11-10
EP2247418B1 true EP2247418B1 (de) 2013-05-22

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Country Status (9)

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US (1) US8540924B2 (ru)
EP (1) EP2247418B1 (ru)
CN (1) CN101932413B (ru)
BR (1) BRPI0821620B1 (ru)
CA (1) CA2713382C (ru)
DE (1) DE102007063374A1 (ru)
PL (1) PL2247418T3 (ru)
RU (1) RU2493959C2 (ru)
WO (1) WO2009083247A1 (ru)

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DE202015102417U1 (de) 2015-05-11 2016-06-14 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung zur kontinuierlichen Herstellung von Werkstoffen
DE202015102422U1 (de) 2015-05-11 2016-08-15 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung zum kontinuierlichen Erwärmen von Material
DE102015107374A1 (de) 2015-05-11 2016-11-17 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung und Verfahren zur kontinuierlichen Herstellung von Werkstoffen
DE102015107380A1 (de) 2015-05-11 2016-11-17 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung zum kontinuierlichen Erwärmen von Material
DE102016110808A1 (de) 2016-06-13 2017-12-14 Siempelkamp Maschinen- Und Anlagenbau Gmbh Verfahren zum kontinuierlichen Erwärmen einer Materialbahn und Durchlaufofen
DE102016119463A1 (de) 2016-10-12 2018-04-12 Siempelkamp Maschinen- Und Anlagenbau Gmbh Durchlaufofen zur kontinuierlichen Erwärmung einer Pressgutmatte
DE202017104748U1 (de) 2017-08-08 2018-10-11 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorwärmvorrichtung für eine kontinuierlich arbeitende Presse
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WO2019170300A1 (de) 2018-03-08 2019-09-12 Siempelkamp Maschinen- Und Anlagenbau Gmbh Durchlaufofen und anlage zur herstellung von holzwerkstoffplatten
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DE102018133294A1 (de) 2018-12-21 2020-06-25 Siempelkamp Maschinen- Und Anlagenbau Gmbh Vorrichtung und Verfahren zur kontinuierlichen Erwärmung einer Pressgutmatte
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US10967538B2 (en) 2015-05-11 2021-04-06 Dieffenbacher GmbH Maschinen-und Anlagenbau Apparatus and method for continuous production of materials
DE202015102422U1 (de) 2015-05-11 2016-08-15 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung zum kontinuierlichen Erwärmen von Material
DE102015107374A1 (de) 2015-05-11 2016-11-17 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung und Verfahren zur kontinuierlichen Herstellung von Werkstoffen
WO2016180886A1 (de) 2015-05-11 2016-11-17 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung und verfahren zur kontinuierlichen herstellung von werkstoffen
DE102015107380A1 (de) 2015-05-11 2016-11-17 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung zum kontinuierlichen Erwärmen von Material
DE102015107380B4 (de) 2015-05-11 2022-11-10 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung zum kontinuierlichen Erwärmen von Material
DE202015102417U1 (de) 2015-05-11 2016-06-14 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung zur kontinuierlichen Herstellung von Werkstoffen
DE102016110808A1 (de) 2016-06-13 2017-12-14 Siempelkamp Maschinen- Und Anlagenbau Gmbh Verfahren zum kontinuierlichen Erwärmen einer Materialbahn und Durchlaufofen
DE102016119463A1 (de) 2016-10-12 2018-04-12 Siempelkamp Maschinen- Und Anlagenbau Gmbh Durchlaufofen zur kontinuierlichen Erwärmung einer Pressgutmatte
WO2019030310A1 (de) 2017-08-08 2019-02-14 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorwärmvorrichtung für eine kontinuierlich arbeitende presse und verfahren zur vorwärmung einer pressgutmatte
DE102017118016A1 (de) 2017-08-08 2019-02-14 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorwärmvorrichtung für eine kontinuierlich arbeitende Presse und Verfahren zur Vorwärmung einer Pressgutmatte
DE202017104748U1 (de) 2017-08-08 2018-10-11 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorwärmvorrichtung für eine kontinuierlich arbeitende Presse
WO2019170300A1 (de) 2018-03-08 2019-09-12 Siempelkamp Maschinen- Und Anlagenbau Gmbh Durchlaufofen und anlage zur herstellung von holzwerkstoffplatten
WO2019170299A1 (de) 2018-03-08 2019-09-12 Siempelkamp Maschinen- Und Anlagenbau Gmbh Durchlaufofen und anlage zur herstellung von holzwerkstoffplatten
DE102018105390B4 (de) * 2018-03-08 2020-08-20 Siempelkamp Maschinen- Und Anlagenbau Gmbh Durchlaufofen und Anlage zur Herstellung von Holzwerkstoffplatten
DE102018133294A1 (de) 2018-12-21 2020-06-25 Siempelkamp Maschinen- Und Anlagenbau Gmbh Vorrichtung und Verfahren zur kontinuierlichen Erwärmung einer Pressgutmatte
WO2021001572A1 (de) 2019-07-04 2021-01-07 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung und verfahren zum transport eines vlieses

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CN101932413A (zh) 2010-12-29
RU2010132157A (ru) 2012-02-10
CA2713382A1 (en) 2009-07-09
US20110089611A1 (en) 2011-04-21
PL2247418T3 (pl) 2013-10-31
WO2009083247A1 (de) 2009-07-09
CN101932413B (zh) 2014-07-16
BRPI0821620A2 (pt) 2015-06-16
BRPI0821620B1 (pt) 2019-05-07
DE102007063374A1 (de) 2009-07-02
EP2247418A1 (de) 2010-11-10
US8540924B2 (en) 2013-09-24
CA2713382C (en) 2016-07-05
RU2493959C2 (ru) 2013-09-27

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