CN103153562A - Wood composite material - Google Patents
Wood composite material Download PDFInfo
- Publication number
- CN103153562A CN103153562A CN2011800472331A CN201180047233A CN103153562A CN 103153562 A CN103153562 A CN 103153562A CN 2011800472331 A CN2011800472331 A CN 2011800472331A CN 201180047233 A CN201180047233 A CN 201180047233A CN 103153562 A CN103153562 A CN 103153562A
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- CN
- China
- Prior art keywords
- composite wooden
- adhesive
- foaming
- wooden material
- described composite
- 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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Classifications
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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
- B27N3/005—Manufacture of substantially flat articles, e.g. boards, from particles or fibres and foam
-
- 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
- B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
-
- 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
Abstract
The present invention relates to a wood composite material that has a density of 200-550 kg/m3 and a stiffness of 4000-12000 MPa, measured in the four-point bending test according to EN 789. The wood composite material comprises macro-fibres having a fineness coefficient greater than 20 and a binder, the binder having a foam structure.
Description
Technical field
The present invention relates to a kind of composite wooden material and production method thereof of suitable production bearing parts.
Background technology
The material tare weight has represented an important material parameter of the bearing parts of Bending.Because tare weight can cause slight warpage, thus low-density and material that enough high strength and rigidity arranged than same mechanical performance but highdensity material more have superiority.
When keeping Rigidity and strength constant simultaneously, the minimizing of the material weight of the reduction association of density is everlasting and is brought many benefits in the middle of ergonomics and logistics.The performance advantage that lighter weight is associated and cost savings are just seemed (for example manually-operated in most basic work, energy consumption when design and transportation and mobile device), and continue in the operation in each stage or in handling procedure afterwards, until finish using (for example assembling of structure division), even might continue to last discarded.
In in recent years, people constantly are devoted to reduce the density of composite wooden material.A basic idea of nearly all light-duty yoke structure is the Dagwood sandwich structure, and wherein the wooden object of strong or hard material or solid can be at edge of materials zone absorption pressure and pulling force, and can mainly transmit shearing force and normal force in the intermediate layer.
Therefore, now by new development and improvement, just experiencing in the timber industry at the paper substrate honeycomb plate that has occurred decades on market and reviving.Although these materials are low-density, their mechanical performance and resistance to water are not enough, so can not be used for bearing.
The raising of material property can realize by the light material of sandwich sandwich structure and foam-like core body.Yet, due to the high shear load being arranged on the low-density intermediate layer, so when bend loading, low shear strength can cause serious distortion.In addition, mechanical property is almost also inadequate for the use as bearing parts.
At present, when producing the composite wooden material that is comprised of long fibre and adhesive, the timber rope strand shape, particulate or fiber can embed with adhesive, and compresses by the compression Sheet Metal Forming Technology subsequently, and the pressing plate that adhesive is heat-treated solidifies.This process has caused material to compress significantly, and is particularly evident at the fringe region of pressed sheet.Therefore, traditional panel material, as hard plate, fiberboard, oriented wood chipboard etc., and there are the more or less situation of different densities section in special wood materials such as Quetschholz, Scrimber, TimTek, Srimtec, SST etc. in whole plate thickness.Basically do not have density profile in order to make, all materials should pass through the processing of powerful compression, or use has very low-density panel material (for example, light weight wood wool board, low density fiberboard etc.).But these materials are because its intensity level is lower, so can not be as the material of bearing.
Release conventional panels and all passed through aborning powerful compression such as the timber compoment of the special timber of Quetschholz, Scrimber, TimTek, Srimtec, SST etc. as preamble.Except the increase of density, this punch process is also relevant with the cyto-architectural compression (collapse) of timber.If absorption moisture, the expansion of the strong hygroscopicity of timber and cell membrane can partly reverse this distortion.Yet this can cause the expansion of compression section, and same whole panel material also can expand.
In addition, due to the compression of marginal zone, we come for solidifying panel material the very difficult inside that in this way heat is incorporated into material.For this reason, these methods generally rely on the impact of steam, to guarantee enough heat transportations.Yet in order to utilize steam impringement, long fibre and/or adhesive must have enough (remaining) moisture.If there is no steam impringement, it must be difficult (particularly in the situation that the less dense planes plate material) that the technology of panel production is implemented.
Although experienced a large amount of trials, both do not combined low density and rigidity on market yet and be suitable for bearing element, the composite wooden material of the shortcoming that in having avoided again producing, compression brings.Therefore the present invention is exactly the composite wooden material that meets These characteristics in order to make.
Summary of the invention
This purpose can be according to a kind of composite wooden material realization of the present invention, and described composite wooden material has 200-550 kg/m
3Density and 4,000-12, the rigidity of 000 MPa, described rigidity is measured in 4 crooked experiments according to standard EN 789, described composite wooden material comprises a draw ratio (length of fiber and the ratio of thickness) and surpasses 20 long fibre and adhesive, and described adhesive has foaming structure.
Composite wooden material according to the present invention has 200-550 kg/m
3Density, preferred 300-550 k g/m
3Density.The rigidity of measuring in 4 crooked experiments according to standard EN 789 is 4,000-12, and 000 MPa is preferred 5,000-12,000 MPa, particularly preferably 6,000-12,000MPa.In an especially preferred embodiment, composite wooden material has 300-550 kg/m
3Density and 6,000-12, the rigidity of 000MPa.
The wooden long fibre that composite wooden material according to the present invention comprises, its draw ratio (length of fiber and the ratio of thickness) is greater than 20.
The long fibre preferred length that uses is particularly preferably the 150-300 millimeter as the 100-400 millimeter.Yet, it will be apparent to those skilled in the art that due to production, the fiber that uses still can contain a certain amount of shorter fiber, and this situation can not be excluded outside protection scope of the present invention.
Also be included under solid state according to composite wooden material of the present invention, the adhesive of foaming structure is arranged.Preferred adhesive mainly has the foaming structure of micropore.Particularly preferred adhesive has a kind of like this foaming structure: the hole of 90-95% has scope in the aperture of 30-500 micron, is preferably the 50-300 micron, and above-mentioned measured value obtains by the microscopic material section.
In a preferred embodiment, be used for the adhesive according to composite wooden material of the present invention, but during free foaming, forming density is 30-300 kg/m
3Foam, be preferably 80-200 kg/m
3Foam.
Density when foaming in order to gain freedom, also unreacted adhesive is poured in an open-topped container.Due to chemical reaction, adhesive can upwards foam, and can freely expand by opening.After curing, overflowing foam can divest totally with knife.The density of the adhesive of free foaming can be from container volume and tare weight and the calculating of lathery container weight of previous acquisition.
In the present invention, preferably use the adhesive of the foaming structure that can form closed pore.Fiber in composite wooden material of the present invention is almost completely by foam parcel, and nearly all interfibrous space all has foam-filledly, and the foam of this hole-closing structure can reduce and prevents the moisture infiltration even fully.This has shown excellent performance when just enough making composite wooden material of the present invention be exposed to wet environment, and for example material only has slight expansion in wet environment.
Therefore, composite wooden material of the present invention is compared with traditional wood materials, can reduce significantly expansion rate when contact wetting, and is quite even lower with the expansion rate of solid wood.And the expansion rate of conventional wooden material generally can exceed much than solid wood.For example, the composite wooden material of the present invention that uses the long fibre of dragon spruce to make, the thickness swelling rate of measuring according to standard DIN 52364 are between 2.7% and 6%, and the expansion rate of measuring according to standard EN 317 is between 1.5% and 5%.The expansion rate of the solid wood dragon spruce of comparatively speaking, measuring according to standard DIN 52364 is approximately 4% to 6%.Accordingly, the expansion rate of the hardboard of use dragon spruce making or oriented wood chipboard is 7% to 30%.
In order further to reduce the expansion rate of composite wooden material; the long fibre that uses can carry out modification by some suitable measures before deep processing; for example; (1) acetylation; perhaps (2) with suitable resin, as melamine resin or chemicals, are flooded as DMDHEU; perhaps (3) heat modification, the perhaps measure of (4) other known improvement expansion.After modification, the expansion that causes due to fiber absorption moisture is reduced, so the overall expansion rate of composite wooden material is very low, is no more than 2% to 4%.Due to its thinner thickness, can be impregnated easily according to the long fibre that uses in composite wooden material of the present invention.In contrast, solid wood seldom can be impregnated, so often failure of the modification of solid wood.
In addition, in chemical method, often need the timber after dipping is heat-treated.Because heat can more promptly surround whole timber, undersized long fibre used according to the invention also more has superiority than solid wood.The heat treatment that this modification needs can even all be incorporated in the production stage of composite wooden material of the present invention more easily by part.
According to the present invention, the adhesive of use is preferably the adhesive of Polymers.For example, epoxy resin, isocyanates (comprising polyurethane), melamine, urea, phenol resin foam or their mixture can use.What particularly preferably use is polyurethane system, for example, and one or Multi-component Polyurethane system, particularly two-component polyurethane systems.Yet also can use the thermoplastic foam, as polystyrene (as expanded polystyrene (EPS) EPS or polystyrene foam plate EPX).
In further preferred embodiment, composite wooden material of the present invention also contains particulate in addition, for example, and can be by the ferric oxide particles of field excitation.When using this particulate, can pass through foaming and curing that applied field (for example, by electromagnetic induction, microwave, high frequency, radiation etc.) causes (startup) and/or speed adhesive.Above-mentioned particle can mix adhesive effectively before producing composite wooden material in, but they also can be mixed respectively.
Select as another kind, we also can utilize heat, and hot-air or steam start and/or foaming and the solidification process of speed adhesive.
In addition, composite wooden material of the present invention can comprise suitable additive, for example foaming agent, filler, pigment, fortifying fibre (nanometer, fento or long fibre), stove fire or Wood protecting agent, and improve the articles for use that expand etc.These additives both can be added in adhesive, also can be incorporated in material respectively.In mode well known to those skilled in the art, such additive can be given composite wooden material with special character, as larger hardness or shear strength, lasting durability, stronger resistance to water etc.
Composite wooden material of the present invention can obtain by following steps:
A) produce long fibre;
B) arrange long fibre;
C) use binding agent;
D) close stamping machine; And
E) adhesive foaming.
In the method according to the invention, adhesive is applied on the long fibre of alignment (step order: a, b, c, d and e).In addition, adhesive also can be used (sequence of steps: a, c, b, d and e) before arranging long fibre.
Said method can carry out easily continuously, for example, utilizes the coil stamping machine.
In order to produce composite wooden material of the present invention, long fibre will be dried and unidirectional (namely parallel) arrangement in large quantities on pressing plate or pressing mold.Adhesive be applied between long fibre and/or on.The application of adhesive can utilize in wood industry existing method to implement, for example spraying or with glue or section mixer.
In the method for a preferred embodiment of the present invention, the foamed time of adhesive needs to control so that foaming process to begin be mainly after stamping machine is closed.This means adhesive system by Chemical Control, make the time started of foaming be delayed.Therefore, can before significantly expanding, foaming close stamping machine or press mold.
When closed stamping machine or pressing mold, long fibre makes the density of the composite wooden material of production can excessively not depart from the density of the timber of use preferably only by minimal compression.Because only having, the long fibre of method of the present invention compressed, so the expansion that contacts with water or be soaked in water that occurs subsequently can be minimized or avoid minimumly.Therefore, the attainable scope of swell value is to be positioned at or lower than the range of expansion of the timber that uses.Compare with traditional wood materials, this is an important advantage, because the traditional arrangement material has very high timber compression ratio, therefore when contacting with water, traditional timber will exceed much than the expansion rate of using solid wood.
In press forming die or stamping machine after closure, the die pressure that is applied in from the outside on the one hand has an effect, and diel is foamed by adhesive on the other hand, inside also produces pressure, make most of adhesive fully penetrate long stapled network, and most of adhesive complete wetting described long stapled surface.Therefore, long fibre is surrounded by adhesive matrix, and obtains thus good protection to avoid absorbing moisture.
Because adhesive is introduced in long stapled network by the expansion of himself, so can form a homogeneous material that uniform density is arranged, wherein nearly all space is full of by foaming structure, and fiber almost completely surrounds (sealing) by foam.
In addition, the method according to this invention, especially when using the two component polyurethane system as adhesive, the advantage that has is: only need to provide negligible heat to solidify in order to start.Required heat can be introduced (for example 30 to 90 ℃, preferred 50 ℃) by long stapled slight preheating.
Because adhesive only contacts with long fibre before being about to curing, 100% adhesive can be used for gummed and " encapsulation " core fiber basically.
If can control adhesive system, it just solidifies when punching press fully so, and then stamping machine can be opened immediately again.Even according to the not sclerosis fully of panel of composite wooden material of the present invention, different from traditional timber panel, this panel can be by so-called Crack failure yet.If the situation of any rear curing is arranged, this can cause the rear expansion of some degree of composite wooden material of the present invention.
Composite wooden material of the present invention is to be suitable for producing all products of being made by solid wood or wood materials, such as hardboard, oriented wood chipboard etc.Because the density of composite wooden material of the present invention is lower, so that have the weight of one also lighter with the product of composite wooden material production of the present invention.
Use composite wooden material of the present invention, especially favourable to following product: because this series products is used for outside non-protection purpose, except weight, dimensional stability that also will be when contact wetting and the reservation of strength and stiffness.Above-mentioned product comprises:
---the template product, as template main beam and part object, as flange or gusset,
---flat board coating or uncoated and part object, as intermediate layer or top layer,
---working face platform and protective scaffold,
---the 1-of circle or flat pattern, the template product of 2-or 3-dimension is used for creating or the supporting template face, and
---loss template (lost formwork) or still be retained in part in structure.
Use composite wooden material of the present invention can benefit the production of product, comprising:
---the timber buildings beam of being made by solid matter, or have cavity, or parts such as flange or gusset (advantage: light weight, performance homogeneous and there is no weak spot, for example node in solid wood wherein; Also can produce crossbeam (beam of the metalloid beam cross section of I type beam or other optimization)),
---wood structure plate and be used for the structural slab (advantage: at relevant static, expansion, moisture resistance, performance and glued board are alike, in addition very light weight and Economic productivity) of furniture,
---the part (top layer, intermediate layer) of wood structure plate,
---mainly perpendicular to the intermediate layer of machine direction, described intermediate layer produces from wooden unit, to be parallel to the direction of fiber, by cutting (advantage: lightweight perpendicular to machine direction, almost there is no thickness swelling, economical production (as ripple Sa cork wood end grain substitute))
---the sandwich battenboard by light especially long fibre intermediate layer consists of, have the load-bearing top layer of being made by suitable material, as veneer, glued board acrylic panel even, have the intermediate layer of vertical or flat grain,
---" thick wooden boards "-be suitable for uniform plate material of wall and ceiling, thickness be 5 centimetres to greater than 20 centimetres (advantages: weight, heat insulation, static, moisture-proof),
---the thick wooden boards (advantage: see above, weight is lighter, saves material) of cavity is arranged
---a plurality of section bars that solid material is made, or have the cavity (advantage: section bar can not have material unaccounted-for (MUF), static loss, the loss in weight when producing) that is suitable for construction set, window, door and furniture
---be used for the plate that vehicle is made, beam and section bar (advantage: weight, static, protection against the tide)
---be used for the circle of the timber structure that vehicle makes and the part of pancake two and three dimensions mould, interior decoration and furniture (advantage: can produce almost any shape, static, weight).
Embodiment
Long fibre is by current of warm air (50 ° of C) drying, and deposits a couple of days under the room temperature of 20 ℃ He in 65% relative air humidity, is about 12% timber thereby produce humidity.210 gram long fibres are arranged in parallel as far as possible accurately.Be heated to 50 ℃ in the aluminum die that 50% fiber is placed into (30 * 12 centimetres), and wetting by 60 gram two component polyurethanes (RAMPF numbers 80 L86/4-1) equably.Then, 50% remaining fiber is placed in mould, and close die, makes the long stapled height that is inserted into can be compressed into 16 millimeters.Due to the chemical reaction of the moisture in timber and two component polyurethane, water can produce foam intensely.After 30 minutes, foam is solidified fully, and composite wooden material takes out from mould.
Claims (16)
1. composite wooden material, the density of described composite wooden material is 200-550 kg/m
3, preferred 300-550 kg/m
3And be 4 according to the rigidity that standard EN 789 is measured in 4 bend tests, 000-12,000MPa, preferred 5,000-12,000MPa, particularly preferably 6,000-12,000MPa, described composite wooden material comprise the long fibre of draw ratio (fiber of length and Thickness Ratio) greater than 20 and are characterized by the adhesive of foaming structure.
2. composite wooden material according to claim 1, is characterized in that, described adhesive is mainly the minute aperture foaming structure, preferably the hole of 90-95% have the size be the aperture of 30-500 μ m, preferred size is the aperture of 50-300 μ m.
3. composite wooden material as claimed in claim 1 or 2, is characterized in that, the adhesive that uses is when free foaming, and can form density is 30-300 kg/m
3Foams, preferred density is 80-200 kg/m
3
4. according to claim 1-3 described composite wooden materials of any one, is characterized in that, polyurethane system is as adhesive.
5. according to claim 1-4 described composite wooden materials of any one, also contain particle, preferably can be by the ferric oxide particles of field excitation.
6. according to claim 1-5 described composite wooden materials of any one, is characterized in that, according to standard EN 317, thickness swelling is to be less than or equal to 5%, preferably is less than or equal to 4%, particularly preferably is less than or equal to 3%.
7. according to claim 1-6 described composite wooden materials of any one, is characterized in that, described long fibre is modified.
8. the production method of according to claim 1-7 described composite wooden materials of any one comprises the following steps:
---long stapled production;
---long stapled arrangement;
---the application of binding agent;
---close stamping machine; And
---the adhesive foaming.
9. method according to claim 8, adhesive composition is controlled, so mainly only beginning after stamping machine cuts out of foaming process.
10. according to claim 8-9 described method, is characterized in that, foaming and solidification process are initiated by the field and/or accelerate.
11. method according to claim 10 is characterized in that, except adhesive, described particle can be by the field excitation that is employed.
12. method according to claim 11 is characterized in that, except adhesive, and in addition can be by the particle of field excitation.
13. according to claim 8-9 described methods is characterized in that, described foaming and solidification process are initiated by heat, hot-air or steam and/or are accelerated.
14. according to claim 8-13 described methods of any one is characterized in that the method can be used as continuous process and implements, for example by the coil press.
15. according to claim 1-7 described composite wooden materials of any one can obtain by according to claim 8-14 described methods.
16. product comprises according to claim 1-7 or 15 described composite wooden materials, this product is finger print panel products and part thereof especially; Coating or uncoated form surfacing and part thereof are arranged; Working face platform and protective scaffold be used for to be built or circle or the pancake template product of one dimension, two dimension or the 3D shape of the template of load-bearing; The parts of also preserving in loss template or structure; Timber structure beam and accessory thereof; Wood structure plate; The furnature construction plate; Top layer (wood) structural slab; Filled board; Solid wood; Section bar; Flat board, beam and the section bar of making for vehicle; Forming part.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010047254.9A DE102010047254B4 (en) | 2010-10-01 | 2010-10-01 | Wood composite |
DE102010047254.9 | 2010-10-01 | ||
PCT/EP2011/067133 WO2012042027A1 (en) | 2010-10-01 | 2011-09-30 | Wood composite material |
Publications (2)
Publication Number | Publication Date |
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CN103153562A true CN103153562A (en) | 2013-06-12 |
CN103153562B CN103153562B (en) | 2016-03-09 |
Family
ID=44906023
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201180047233.1A Active CN103153562B (en) | 2010-10-01 | 2011-09-30 | Composite wooden material |
Country Status (11)
Country | Link |
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EP (1) | EP2621695B1 (en) |
JP (1) | JP5997696B2 (en) |
KR (1) | KR101500925B1 (en) |
CN (1) | CN103153562B (en) |
BR (1) | BR112013007793A2 (en) |
DE (1) | DE102010047254B4 (en) |
ES (1) | ES2663007T3 (en) |
NO (1) | NO2621695T3 (en) |
PL (1) | PL2621695T3 (en) |
RU (1) | RU2541652C2 (en) |
WO (1) | WO2012042027A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109702845A (en) * | 2018-11-29 | 2019-05-03 | 南京林业大学 | A kind of low-density is without glue stalk board, preparation method and applications |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4286123A1 (en) | 2022-05-30 | 2023-12-06 | ETH Zurich | Rod-based wood materials |
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- 2011-09-30 RU RU2013120352/13A patent/RU2541652C2/en active
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- 2011-09-30 KR KR1020137009964A patent/KR101500925B1/en active IP Right Grant
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CN1861341A (en) * | 2006-06-12 | 2006-11-15 | 中林南星(湖州)合板有限公司 | Method for prodn. of high strength high elastic wood composite material by using wood from quick growing species trees as raw material |
CN101116994A (en) * | 2006-07-31 | 2008-02-06 | 于传敏 | Method for preparing novel vegetation composite tube |
CN101042018A (en) * | 2007-04-10 | 2007-09-26 | 南京工业大学 | Composite material formwork |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109702845A (en) * | 2018-11-29 | 2019-05-03 | 南京林业大学 | A kind of low-density is without glue stalk board, preparation method and applications |
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RU2013120352A (en) | 2014-11-20 |
DE102010047254B4 (en) | 2017-02-02 |
JP2013541444A (en) | 2013-11-14 |
RU2541652C2 (en) | 2015-02-20 |
CN103153562B (en) | 2016-03-09 |
ES2663007T3 (en) | 2018-04-10 |
PL2621695T3 (en) | 2018-04-30 |
KR101500925B1 (en) | 2015-03-10 |
NO2621695T3 (en) | 2018-06-02 |
DE102010047254A1 (en) | 2012-04-05 |
EP2621695B1 (en) | 2018-01-03 |
BR112013007793A2 (en) | 2016-06-07 |
JP5997696B2 (en) | 2016-09-28 |
WO2012042027A1 (en) | 2012-04-05 |
EP2621695A1 (en) | 2013-08-07 |
KR20130088157A (en) | 2013-08-07 |
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