CN101450493A - Production method of modified wood, bamboo glued mould - Google Patents
Production method of modified wood, bamboo glued mould Download PDFInfo
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- CN101450493A CN101450493A CNA2008101529089A CN200810152908A CN101450493A CN 101450493 A CN101450493 A CN 101450493A CN A2008101529089 A CNA2008101529089 A CN A2008101529089A CN 200810152908 A CN200810152908 A CN 200810152908A CN 101450493 A CN101450493 A CN 101450493A
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Abstract
The invention discloses a method for manufacturing modified plywood formwork of wood or bamboo wood. The method is implemented by the following steps: small-diameter cotton-wood, China fir or small-diameter mixed bamboo instead of large-diameter high-quality wood and large-diameter moso bamboo are taken as raw materials to process into wood wool and bamboo filaments; soluble phenolic resin with a solid content of 20 to 30 percent is used as a modifier of the material; the phenolic resin is impregnated in the fiber cell lumens of the material by a pressure impregnation method to change the moisture expansion property of the material; the wood wool or the bamboo filaments containing less than or equal to 15 percent of water is used as assembly materials; modified and dried wood wool or bamboo filaments and paper impregnated with phenolic resin are used as assembly materials for plywood, and an assembly structure is a three-layer composite structure; main parameters of thermo-compression and bonding include: a unit pressure of 40 to 50 kg/cm<2>, a bonding temperature of 150 +/-10 DEG C, thermo-compression time of one minute for each millimeter of the thickness of board; the board is unloaded when cooled to less than or equal to 50 DEG C after thermo-compression and bonding and is subjected to edge cutting to be processed to the plywood; and after the worn surface finish of the plywood is restored through recoating by a secondary veneering method, the plywood is reused.
Description
Technical field:
The present invention relates to a kind of facture of wood-based plate, the preparation method of particularly a kind of improved wood, bamboo glued mould.
Background technology:
At present, wood-based plate, is the multi-plywood material made of raw material with timber and is the multilayer bamboo plywood material that raw material is made with the bamboo wood as a large amount of the mainly containing of using of template in building industry.The manufacture method of these two kinds of sheets is that the big footpath of employing high-quality timber and big directly mao bamboon are raw material, and be processed into behind the sheet veneer of certain secondary face size or bamboo curtain splint, the bamboo mat assembly base material as sheet material, adopt phenolic resins to be coated with or to be immersed in the surface of sheet assembly base material as adhesive, form blanket by the method for square crossing in length and breadth then, be processed into sheet through precompressed, hot pressing again.All available resin impregnating paper in the surface of two kinds of sheets or ultrapas impregnated paper as the material of plate surface overlay film in order to improve the surface smoothness and instructions for use and the nonexpondable effect of anti-wear performance of sheet material in the hope of reaching Shimizu concrete template.
In the manufacture craft of above-mentioned two kinds of sheets, all be that adhesive to be coated with or to be immersed in flaky material be veneer or bamboo curtain splint, the surface of bamboo mat assembly base material, under the pressure and temperature condition of regulation, be to rely on the chemical force of adhesive and physical force that the blanket gummed is become whole sheet material, do not change timber, the wet character that rises of two kinds of materials of bamboo wood, therefore under the condition of concrete wet work, moisture content in the concrete is adsorbed gradually by sheet material and sheet timber bamboo or material, the moisture content of sheet material improves, all descend thereupon and the sheet material dilatancy takes place as the main mechanical index MOR of template and elastic modelling quantity, cause scrapping and defective phenomenon of construction quality and quality accident occurring of sheet material thus, even plate surface has the existence of covering material also to fail to reach the effect that sheet material repeatedly has enough to meet the need use, timber because of occurring being out of shape the problem of scrapping in the sheet material use, this common problem that two kinds of glued moulds of bamboo wood all exist has illustrated that the defective that exists in present two kinds of template conventional fabrication processes methods should change.
Summary of the invention:
The objective of the invention is to overcome the weak point in above-mentioned two kinds of template fabrication, method with modification technology is injected phenolic resins the inside of timber, bamboo fiber lumen and is formed the wet performance that rises that high molecular polymer fundamentally changes timber, two kinds of materials of bamboo wood with it, thereby widen the range of application of material with the density that higher pressure increases material, provide a kind of steady quality and the manufacture method of can be repeatedly remoulded reusable improved wood, bamboo glued mould.
Implementation of the present invention is as follows for achieving the above object:
The manufacture method of a kind of improved wood, bamboo glued mould is characterized in that the step of implementing is as follows:
(1) processing of wood wool, bamboo silk: substituting big directly birch, pine with seeds such as the following path poplar of diameter 20cm, China firs is raw material, use the continuous Xuan of no axis Xuan cutter to cut into veneer, with filament cutter veneer is cut into wood wool, the specification of wood wool is long 500mm-2500mm, wide≤5mm, thick 0.5mm-5mm; Adopting the following small diameter bamboo of diameter 8cm to substitute big footpath mao bamboon is raw material, uses the bamboo wood wire drawing machine to make the bamboo silk, and bamboo silk specification is long 500mm-2500mm, wide≤5mm, thick≤5mm;
(2) material modification is handled: the water soluble phenol resin of employing solid content 20%-30% uses simultaneously as the modifier and the adhesive of material, adopt the pressure impregnating method with in the phenolic resins injection material fiber finer cell, play at material internal behind the resin solidification and fill and closely knit effect also forms high molecular polymerization with it, timber, the wet performance that rises of bamboo wood have been changed, for mechanical index such as the bonding strength that makes template and MOR, elastic modelling quantity reach maximum, the amount of impregnating of resin is controlled at 100%-120%;
(3) low temperature drying is handled: the wood wool after modification is handled, bamboo silk adopt mesh belt dryer to carry out low temperature drying and handle, main technologic parameters is: 70 ℃ ± 10 ℃ of temperature, wind speed 2-3m/s, guipure gait of march 2m/min, dried moisture content is controlled at≤15% in, use as the assembly material;
(4) assembly material and assembly structure: modification and dried wood wool or bamboo silk and resin impregnating paper are the assembly material of template altogether, the assembly structure is three layers of duplex, be about to be seated in two surfaces in bottom and top of wood wool or bamboo wire material as the impregnated paper of template covering material, the form of piling up of intermediate layer wood wool or bamboo wire material is not limit, at first take advantage of the densitometer of sheet material design to calculate the weight of material requested before the assembly by the volume of slab, and it is standby to weigh respectively successively, specification behind the assembly is length≤2500mm, width≤1300mm, thickness 8mm-50mm, the mode of this assembly structure can once make the template of band overlay film, simplifies and has save secondary veneer coating processes;
(5) hot-press gluing and cooling and shaping: in the lump be placed on loader on together with backing plate blanket, loader is sent into blanket and backing plate successively in the multi-daylight press of device to be cooled and is carried out hot-press gluing and cooling and shaping, and main technologic parameters is: unit pressure 40kg-50kg/cm
2, gummed 150 ℃ ± 10 ℃ of temperature, hot pressing time press sheet material thickness 1min/mm calculating, hot pressing time is closed the heat supply valve after satisfying technological requirement, open cooling water valve sheet material is carried out the cooling and shaping processing, when the plate surface temperature of press reduce to≤draw off sheet material with unloader 50 ℃ the time, this moment, the chemical reaction of sheet material inside did not also stop fully, the sheet material block pattern row pattern that draws off also carries out 24 hours-48 hours the Balance Treatment of displaying, and has then finished the processing overall process to the sheet material typing when the temperature of sheet material is consistent with environment temperature;
(6) cutting edge processing: adopt mitre saw to carry out cutting edge processing, add and to carry out cutting edge according to the horizontal order in vertical back earlier man-hour, make it become specification unanimity, four limits are straight, diagonal is consistent template finished product after the processing by the specification requirement of template;
(7) secondary operations of template renovation: improved wood, when bamboo glued mould normally uses under concrete wet work condition, sheet material do not take place wet rise distortion with scrap, the anti-wear performance of surface coating material can satisfy use more than 30 times, when can renovating processing, the surface coating damage of material and the rear pattern plate that is worn reuse, add that to adopt width man-hour be that the plane sand machine of 1300mm digs and sand flat simultaneously backing material plate with the covering material of two remained on surface of template, adopting the processing method of conventional secondary veneer is whole sheet material with resin impregnating paper and backing material plate strong bonded, and the renovation template surface anti-wear performance behind secondary veneer overlay film and every mechanical index all still can reach every standard that template is used.
The invention has the beneficial effects as follows: the method with modification technology is injected timber with phenolic resins; the inside of bamboo fiber lumen forms high molecular polymer with it; the method that glues together with height increases the density of template; fundamentally eliminated the defective of the wet distortion of rising of template; the reliable template MOR that also greatly improved of steady quality; main mechanical index such as elastic modelling quantity; can effectively guarantee construction quality; template can be carried out overlay film renovation processing and be accomplished repeatedly to recycle; when reducing the construction use cost, can save a large amount of timber; bamboo timber resource; play the effect of the ecological environment that conserves forests, meet the requirement of building a conservation-minded society.
The specific embodiment:
Below in conjunction with preferred embodiment, details are as follows to the manufacture method specific embodiment according to improved wood provided by the invention, bamboo glued mould:
Embodiment 1: specification is the improved wood glued mould of 2440mm * 1220mm * 8mm
(1) wood wool processing: adopting 12mm-20mm path poplar is raw material, block into the long juggle of 2460mm with saw, after debarking, Xuan is cut into the veneer that thickness is 2mm on nothing card Xuan cutter, uses filament cutter that veneer is cut into the long wood wool of width as 3mm continuously;
(2) material modification is handled: water soluble phenol resin is added water, and to be modulated into solid content be 25% glue, wood wool is placed in the vacuum pressed jar, and injects glue, open vavuum pump, be forced into 0.9mpa, it is that 115% modification is handled that pressurize 15min carries out the resin amount of impregnating to material;
(3) low temperature drying is handled: adopt mesh belt dryer that the wood wool that impregnates behind the phenolic resins is carried out drying processing continuously, technological parameter is: 70 ℃-80 ℃ of temperature, wind speed 3m/s, the dried moisture content of guipure gait of march 2m/min wood wool are 12%;
(4) assembly material and assembly structure: the specification length of assembly and width are 2460 * 1240 * 8mm=0.0244032m greater than its volume of finished product sheet material 20mm respectively
3Its sheet material design density is 1.05, calculate every required assembly material of sheet material and weigh 25.62 kilograms, before being transported to the assembly workbench after weighing respectively successively, the stainless steel backing plate is placed on the work top, place a resin impregnating paper that is of a size of 2460mm * 1240mm then, wood wool is placed on the impregnated paper back on the surface by fibre length direction uniform coding, and then lays the resin impregnating paper with the bottom same size, the blanket of formation three-layer composite structure;
(5) hot-press gluing and cooling and shaping: 10 layers of hot press that use band automatic loading and unloading plate machine, the book size of pressing plate is 2600mm * 1300mm, the work gross pressure is 2000 tons and has the press of cooling device, earlier in the finger gauge of putting 2600mm * 20mm * 8mm between each laminate; 10 blankets that combine are placed on the platform of loader, successively blanket is sent in each layer of hot press respectively by loader after, 45kg/cm is pressed in the pressurization of press auto-closing
2Calculating the operating pressure of using is 1372.68 tons, stop pressurization when being forced into required pressure, be warming up to 150 ℃ of pressurizes 8 minutes the slab gummed is become whole sheet material, close the heat supply valve, the cooling of open cold penstock, finishing sheet material when being about 20 minutes cool time and being cooled to 50 ℃ tentatively finalizes the design, release also draws off sheet material with unloader in hot press, the sheet material that draws off is parallel successively to be piled up in fixed venue, display after 24 hours temperature when sheet material when consistent with environment temperature sheet material stop chemical reaction and finished all processes of hot-press gluing and cooling and shaping, made the burr plate of improved wood glued mould;
(6) cutting edge processing: use mitre saw that the burr plate is processed, vertically cutting edge earlier, laterally cutting edge of back, the specification after the cutting edge is: 2440mm * 1220mm * 8mm, the wood gluing template finished product that four limits are straight, diagonal is consistent;
(7) secondary operations of template renovation: when the improved wood glued mould after repeatedly using under the concrete wet work condition, the surface coating material template that is worn to can not satisfy instructions for use the time can be renovated processing; Add that to adopt width man-hour be that the plane sand machine of 1300mm digs and sand flat simultaneously backing material plate with the residual covering material on two surfaces of template, with dual-layer adhesive machine backing material plate is carried out double spread, adhesive is the water soluble phenol resin of solid content 56% ± 2%, and glue-spread is 120g-150g/m
2, adopting resin impregnating paper is covering material, impregnated paper is seated in hot-press gluing in the hot press of sending into the band stainless steel mirror board behind two surfaces of gluing backing material plate respectively, main technologic parameters is: pressure 8kg-10kg/cm
2, 150 ℃ ± 10 ℃ of temperature of gummed, dwell time 30s-40s, the renovation wood gluing template surface anti-wear performance behind secondary veneer overlay film and every mechanical index all still can reach every standard that Shimizu concrete template uses.
Embodiment 2: specification is the modification bamboo glued mould of 2440mm * 1220mm * 12mm
(1) bamboo silk processing: adopting the following small diameter bamboo of diameter 8mm is raw material, blocks into the long bamboo section of 2460mm with saw, uses the bamboo wood wire drawing machine that it is pulled into the bamboo silk of the thick 2mm of the wide 3mm of long 2460mm;
(2) material modification is handled: water soluble phenol resin is added water, and to be modulated into solid content be 30% glue, the bamboo silk is placed in the vacuum pressed jar, and injects glue, open vavuum pump, be forced into 0.8mpa, it is that 112% modification is handled that pressurize 15min carries out the resin amount of impregnating to material;
(3) low temperature drying is handled: adopt mesh belt dryer that the bamboo silk that impregnates behind the phenolic resins is carried out drying processing continuously, technological parameter is: 70 ℃-80 ℃ of temperature, wind speed 3m/s, the dried moisture content of guipure gait of march 2m/min bamboo silk are 12%;
(4) assembly material and assembly structure: the specification length of assembly and width are respectively greater than its volume of finished product sheet material 20mm 2460mm * 1240mm * 12mm=0.0366048m
3Its sheet material design density is 1.02 to calculate every sheet material assembly material and weigh 37.34 kilograms, before being transported to the assembly workbench after weighing respectively successively, the stainless steel backing plate is placed on the work top, place a resin impregnating paper that is of a size of 2460mm * 1240mm then, the bamboo silk is placed on the impregnated paper back by fibre length direction uniform coding re-lays the resin impregnating paper with the bottom same size, the blanket of formation three-layer composite structure on the surface;
(5) hot-press gluing and cooling and shaping: 10 layers of hot press that use band automatic loading and unloading plate machine, the book size of pressing plate is 2600mm * 1300mm, the work gross pressure is 2000 tons and has the press of cooling device, earlier in the finger gauge of putting 2600mm * 20mm * 12mm between each laminate; 10 blankets that combine are placed on the platform of loader, successively blanket is sent in each layer of hot press respectively by loader after, 40kg/cm is pressed in the pressurization of press auto-closing
2Calculating the operating pressure of using is 1220.16 tons, stop pressurization when being forced into required pressure, be warming up to 150 ℃ of pressurizes 12 minutes the slab gummed is become whole sheet material, close the heat supply valve, the cooling of open cold penstock, finishing sheet material when being about 20 minutes cool time and being cooled to 50 ℃ tentatively finalizes the design, release also draws off sheet material with unloader in hot press, the sheet material that draws off is parallel successively to be piled up in fixed venue, display after 24 hours temperature when sheet material when consistent with environment temperature sheet material stop chemical reaction and finished all processes of hot-press gluing and cooling and shaping, made the burr plate of modification bamboo glued mould;
(6) cutting edge processing: use mitre saw that the burr plate is processed, vertically cutting edge earlier, laterally cutting edge of back, the specification after the cutting edge is the bamboo glued mould finished product that 2440mm * 1220mm * 12mm four limits are straight, diagonal is consistent;
(7) secondary operations of template renovation: when the modification bamboo glued mould after repeatedly using under the concrete wet work condition, the surface coating material template that is worn to can not satisfy instructions for use the time can be renovated processing; Add that to adopt width man-hour be that the plane sand machine of 1300mm digs and sand flat simultaneously backing material plate with the residual covering material on two surfaces of template, with dual-layer adhesive machine backing material plate is carried out double spread, adhesive is the water soluble phenol resin of solid content 56% ± 2%, and glue-spread is 120g-150g/m
2, adopting resin impregnating paper is covering material, impregnated paper is seated in hot-press gluing in the hot press of sending into the band stainless steel mirror board behind two surfaces of gluing backing material plate respectively, main technologic parameters is: pressure 8kg-10kg/cm
2, 150 ℃ ± 10 ℃ of temperature of gummed, dwell time 30s-40s, the renovation bamboo glued mould surface abrasion resistance behind secondary veneer overlay film and every mechanical index all still can reach every standard that Shimizu concrete template uses.
Above-mentioned detailed description of the manufacture method of improved wood, bamboo glued mould being carried out with reference to embodiment; be illustrative rather than determinate; can enumerate a plurality of embodiment according to institute's restricted portion; therefore in the variation and the modification that do not break away under the general plotting of the present invention, should belong within protection scope of the present invention.
Claims (1)
1, the manufacture method of a kind of improved wood, bamboo glued mould, implementation step is as follows:
(1) processing of wood wool, bamboo silk: substituting big directly birch, pine with seeds such as the following path poplar of diameter 20cm, China firs is raw material, use the continuous Xuan of no axis Xuan cutter to cut into veneer, with filament cutter veneer is cut into wood wool, the specification of wood wool is long 500mm-2500mm, wide≤5mm, thick 0.5mm-5mm; Adopting the following small diameter bamboo of diameter 8cm to substitute big footpath mao bamboon is raw material, uses the bamboo wood wire drawing machine to make the bamboo silk, and bamboo silk specification is long 500mm-2500mm, wide≤5mm, thick≤5mm;
(2) material modification is handled: the water soluble phenol resin of employing solid content 20%-30% uses simultaneously as the modifier and the adhesive of material, adopt the pressure impregnating method with in the phenolic resins injection material fiber finer cell, play at material internal behind the resin solidification and fill and closely knit effect also forms high molecular polymerization with it, timber, the wet performance that rises of bamboo wood have been changed, for mechanical index such as the bonding strength that makes template and MOR, elastic modelling quantity reach maximum, the amount of impregnating of resin is controlled at 100%-120%;
(3) low temperature drying is handled: the wood wool after modification is handled, bamboo silk adopt mesh belt dryer to carry out low temperature drying and handle, main technologic parameters is: 70 ℃ ± 10 ℃ of temperature, wind speed 2-3m/s, guipure gait of march 2m/min, dried moisture content is controlled at≤15% in, use as the assembly material;
(4) assembly material and assembly structure: modification and dried wood wool or bamboo silk and resin impregnating paper are the assembly material of template altogether, the assembly structure is three layers of duplex, be about to be seated in two surfaces in bottom and top of wood wool or bamboo wire material as the impregnated paper of template covering material, the form of piling up of intermediate layer wood wool or bamboo wire material is not limit, at first take advantage of the densitometer of sheet material design to calculate the weight of material requested before the assembly by the volume of slab, and it is standby to weigh respectively successively, specification behind the assembly is length≤2500mm, width≤1300mm, thickness 8mm-50mm, the mode of this assembly structure can once make the template of band overlay film, simplifies and has save secondary veneer coating processes;
(5) hot-press gluing and cooling and shaping: in the lump be placed on loader on together with backing plate blanket, loader is sent into blanket and backing plate successively in the multi-daylight press of device to be cooled and is carried out hot-press gluing and cooling and shaping, and main technologic parameters is: unit pressure 40kg-50kg/cm
2, gummed 150 ℃ ± 10 ℃ of temperature, hot pressing time press sheet material thickness 1min/mm calculating, hot pressing time is closed the heat supply valve after satisfying technological requirement, open cooling water valve sheet material is carried out the cooling and shaping processing, when the plate surface temperature of press reduce to≤draw off sheet material with unloader 50 ℃ the time, this moment, the chemical reaction of sheet material inside did not also stop fully, the sheet material block pattern row pattern that draws off also carries out 24 hours-48 hours the Balance Treatment of displaying, and has then finished the processing overall process to the sheet material typing when the temperature of sheet material is consistent with environment temperature;
(6) cutting edge processing: adopt mitre saw to carry out cutting edge processing, add and to carry out cutting edge according to the horizontal order in vertical back earlier man-hour, make it become specification unanimity, four limits are straight, diagonal is consistent template finished product after the processing by the specification requirement of template;
(7) secondary operations of template renovation: improved wood, when bamboo glued mould normally uses under concrete wet work condition, sheet material do not take place wet rise distortion with scrap, the anti-wear performance of surface coating material can satisfy use more than 30 times, when can renovating processing, the surface coating damage of material and the rear pattern plate that is worn reuse, add that to adopt width man-hour be that the plane sand machine of 1300mm digs and sand flat simultaneously backing material plate with the covering material of two remained on surface of template, adopting the processing method of conventional secondary veneer is whole sheet material with resin impregnating paper and backing material plate strong bonded, and the renovation template surface anti-wear performance behind secondary veneer overlay film and every mechanical index all still can reach every standard that template is used.
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| CN102233603A (en) * | 2010-05-07 | 2011-11-09 | 潘金瓶 | Method for manufacturing light outdoor recombination bamboo landscape material |
| CN102409835A (en) * | 2011-09-07 | 2012-04-11 | 李茂林 | High-density composite board specially used for wood floor and manufacturing method thereof |
| CN102514067A (en) * | 2011-12-08 | 2012-06-27 | 覃健林 | Processing method for bamboo wadding lunch boxes, dinnerware and products |
| CN103029178A (en) * | 2012-12-17 | 2013-04-10 | 郑州兴旺木业有限公司 | Method for manufacturing bamboo strengthened poplar laminated veneer lumber |
| CN103341893A (en) * | 2013-07-04 | 2013-10-09 | 中南林业科技大学 | Wood panel flat-pressing dipping filling modification method and device |
| CN103781605A (en) * | 2011-05-03 | 2014-05-07 | 科博尼Asa | Polymer impregnated bamboo |
| CN104908127A (en) * | 2014-03-11 | 2015-09-16 | 姚本海 | Bamboo preparation method and application structure thereof |
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| CN102233603B (en) * | 2010-05-07 | 2013-07-03 | 潘金瓶 | Method for manufacturing light outdoor recombination bamboo landscape material |
| CN102233603A (en) * | 2010-05-07 | 2011-11-09 | 潘金瓶 | Method for manufacturing light outdoor recombination bamboo landscape material |
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| CN103781605A (en) * | 2011-05-03 | 2014-05-07 | 科博尼Asa | Polymer impregnated bamboo |
| CN102409835A (en) * | 2011-09-07 | 2012-04-11 | 李茂林 | High-density composite board specially used for wood floor and manufacturing method thereof |
| CN102514067B (en) * | 2011-12-08 | 2014-09-24 | 覃健林 | Processing method for bamboo wadding lunch boxes, dinnerware and products |
| CN102514067A (en) * | 2011-12-08 | 2012-06-27 | 覃健林 | Processing method for bamboo wadding lunch boxes, dinnerware and products |
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| CN103029178A (en) * | 2012-12-17 | 2013-04-10 | 郑州兴旺木业有限公司 | Method for manufacturing bamboo strengthened poplar laminated veneer lumber |
| CN103341893A (en) * | 2013-07-04 | 2013-10-09 | 中南林业科技大学 | Wood panel flat-pressing dipping filling modification method and device |
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| CN104908127A (en) * | 2014-03-11 | 2015-09-16 | 姚本海 | Bamboo preparation method and application structure thereof |
| CN106426426A (en) * | 2016-08-02 | 2017-02-22 | 浙江长兴森大竹木制品有限公司 | Manufacturing process of bamboo-wood composite concrete formwork |
| CN106363761A (en) * | 2016-08-31 | 2017-02-01 | 洪雅竹元科技有限公司 | Bamboo-linen composite board and manufacturing method thereof |
| CN112223473A (en) * | 2020-10-20 | 2021-01-15 | 深圳市瑞成科讯实业有限公司 | Modified wood fiber, preparation method thereof and application thereof in papermaking |
| CN112223473B (en) * | 2020-10-20 | 2022-03-08 | 深圳市瑞洲实业股份有限公司 | Modified wood fiber, preparation method thereof and application thereof in papermaking |
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| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice |
Addressee: Li Maolin Document name: Notification of before Expiration of Request of Examination as to Substance |
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| DD01 | Delivery of document by public notice |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090610 |