CN102259371A - Bamboo-wood mixed recombined material and processing method thereof - Google Patents
Bamboo-wood mixed recombined material and processing method thereof Download PDFInfo
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- CN102259371A CN102259371A CN2011102209291A CN201110220929A CN102259371A CN 102259371 A CN102259371 A CN 102259371A CN 2011102209291 A CN2011102209291 A CN 2011102209291A CN 201110220929 A CN201110220929 A CN 201110220929A CN 102259371 A CN102259371 A CN 102259371A
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- 239000002023 wood Substances 0.000 title claims abstract description 100
- 239000000463 material Substances 0.000 title claims abstract description 82
- 238000003672 processing method Methods 0.000 title claims abstract description 16
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 90
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 90
- 241001330002 Bambuseae Species 0.000 claims abstract description 90
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 90
- 239000011425 bamboo Substances 0.000 claims abstract description 90
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000011049 filling Methods 0.000 claims abstract description 5
- 230000008521 reorganization Effects 0.000 claims description 39
- 239000003292 glue Substances 0.000 claims description 13
- 241000196324 Embryophyta Species 0.000 claims description 11
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000005470 impregnation Methods 0.000 claims description 7
- 238000012856 packing Methods 0.000 claims description 7
- 238000000748 compression moulding Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- 239000003086 colorant Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000005011 phenolic resin Substances 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000003763 carbonization Methods 0.000 claims description 2
- 238000004043 dyeing Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 240000001082 Bambusa multiplex Species 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000003825 pressing Methods 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract 1
- 238000004513 sizing Methods 0.000 abstract 1
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- 238000005516 engineering process Methods 0.000 description 5
- 240000007049 Juglans regia Species 0.000 description 4
- 235000009496 Juglans regia Nutrition 0.000 description 4
- 230000036541 health Effects 0.000 description 4
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- 240000007880 Phyllostachys bambusoides Species 0.000 description 3
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- 244000166124 Eucalyptus globulus Species 0.000 description 2
- 241000219000 Populus Species 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 241000609240 Ambelania acida Species 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 206010013786 Dry skin Diseases 0.000 description 1
- 101000911390 Homo sapiens Coagulation factor VIII Proteins 0.000 description 1
- 235000001550 Phyllostachys bambusoides Nutrition 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- -1 and bark Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000010905 bagasse Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000007799 cork Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 102000057593 human F8 Human genes 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229940047431 recombinate Drugs 0.000 description 1
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Abstract
The invention relates to a recombined plate blank in a building plate, in particular to a bamboo-wood mixed recombined material and a processing method thereof. In order to overcome the technical defects that the conventional pressed plate blank made of a single material has a poor forming texture, non-uniformly mixed materials, low consistency and strength, and high energy consumption and is difficult to manufacture, the invention provides the bamboo-wood mixed recombined material which has an abundant texture, uniformly and densely mixed materials and high strength and is convenient to manufacture, and the processing method thereof. The bamboo-wood mixed recombined material comprises bamboo and wood, and is characterized in that: the bamboo and the wood have equal length and are randomly superposed in the same direction and pressed and glued to form a section. The section is formed by mixing and pressing the bamboo and the wood, the wood is used for controlling the pattern of the texture, the bamboo is used for filling holes and reducing gaps, the texture formed by mixing the two materials is abundant, the recombined plate blank has more attractive appearance than the conventional pressed plate blank made of the single material, and the recombined material formed by pressing is uniform and dense and has high strength; and the two materials are filled and mixed mutually, so that the required sizing amount is smaller than that of the section made of the single material.
Description
Technical field
The present invention relates to the reorganization slab in the building board, particularly a kind of bamboo wood mixes reorganization material and processing method thereof.
Background technology
Existing common reorganization material all be to press compound or with sheet, bar, the silk of material similar shape or restraint extrusion bonded becoming a useful person after applying glue with the multilayer of material, reorganization bamboo clappers as bamboo silk applying glue hot pressing, the science and technology wood that pressings such as poplar sheet or Eucalyptus sheet form, the small diameter grade timber reorganization material that single branch pressing forms, all there is certain defective in these recombination boards, reorganization bamboo clappers tone is single, and texture variations is little; Single poplar sheet, Eucalyptus, the science and technology wood that long materials such as employing are pressed into, during pressing because wood chip is mobile poor, the space is big between volume and the volume, need be with the glue hole that plugs the gap, glue consumption environmental protection greatly inadequately, the shaping slab uniformity that compacting obtains is poor, intensity is little, so science and technology wood is used for making wood chip more, can not directly use, and the texture of science and technology wood changes less with respect to solid wood texture as new material; Single branch is pressed material, is subjected to material self length restriction, the short material of dress Mo Shiyinduogen spreading in the practical operation, and joint is overlapping, and local friction's power causes difficult feed greatly, and equipment loss is big, and the power consumption height does not meet the environmental protection needs of energy-saving and emission-reduction.
Summary of the invention
The technical assignment of the technical problem to be solved in the present invention and proposition is that to overcome the shaping texture that existing single material compacting slab exists poor, technological deficiency inhomogeneous, that uniformity is poor, intensity is little and the manufacturing difficult, energy consumption is high that material mixes provides a kind of back texture-rich that is shaped, material to mix the bamboo wood closely knit, that intensity is high, easily manufactured and mixes recombinate material and processing method thereof.
For achieving the above object, the present invention takes following technical scheme: bamboo wood mixes the reorganization material, comprises bamboo wood and timber, it is characterized in that the isometric and stacked at random repressed section bar that composes in the same way of described bamboo wood and timber.Described section bar is meant the reorganization material corresponding with the cavity shape of compacting tool set; Described is in the same way parallel or in the same way tilting in the same way, does not comprise vertical storing.The present invention has changed existing single material-structure, be pressed into the reorganization material by the mixing of bamboo wood, the effect of timber is to form to enrich texture, and the effect of bamboo is to fill with timber to mix, and utilizes the bamboo wood pressurized flow to plug the gap, it is little that the bamboo wood of making at last mixes few slit, reorganization material cavity, whole even closely knit intensity height, because two kinds of materials are filled mixing mutually, the more single material of required resin added reduces with glue, two kinds of materials are mixed the texture-rich that forms, and existing single material compacting slab is more attractive in appearance.Isometric bamboo wood and timber dress mould are convenient, and charging is easy, and equipment loss is little, and power consumption is low, energy-conserving and environment-protective.
Described bamboo wood is bamboo bundle and/or bamboo silk, and described timber is wood bundle and/or individual wood chip.Bamboo is restrainted, bamboo silk material is elongated, utilizes prior art easy to process, and good fluidity is beneficial to moulding in compacting; It is frivolous that wood is restrainted, individual wood chip is web-like, can make the reorganization material texture variations of moulding abundant, and two kinds of mixed reorganization materials that get of different materials are finer and close, and intensity is good.
Filling plant auxiliary material at random in described bamboo wood and the timber.The plant auxiliary material of the existing easily collecting of utilization is filled up hole and the slit in the compacting, improves reorganization material density; Stacked bamboo wood and timber are along with the plant auxiliary material bending of putting into, and compacting obtains more beautiful abundant textured pattern, as straight burr, mountain line and knot etc.Described plant auxiliary material can be shell such as walnut shell, coconut husk, and bark, cork sheet, crops bar stem, bagasse and be the waste paper etc. of raw material with the wood pulp, these auxiliary materials are discarded object normally, with both having turned waste into wealth, also can improve reorganization wood property energy here.In addition, also can be broken bamboo end, bamboo silk, wooden skin fragment, why be called fragment, be meant the bamboo wood leftover pieces of 1 meter of its curtailment, the effect of these fragments also is to fill up hole, slit, improves reorganization material density, enriches texture.
Bamboo wood mixes the reorganization material processing method, comprises the following steps of carrying out according to the order of sequence:
A. with bamboo wood and timber heating, drying, the control moisture content is below 10%;
B. Hong Gan bamboo wood and timber impregnation were handled 2~8 minutes;
C. bamboo wood behind the impregnation and timber are dry again, and the control moisture content is below 16%;
D. the mould of packing into after weighing by weight ratio after the arrangement of Gan Zao bamboo wood and timber is suppressed;
E. the demoulding obtains the reorganization material of compression moulding;
It is characterized in that bamboo wood and timber after described isometric the cutting stack the mould of packing at random by extending in the same way, bamboo wood is 3~15%, and timber is 75~92%, and glue is 5~10%; Described steps d is warmed to 130~140 ℃ simultaneously for pressurization 15~25Mpa, and release pressure discharging after 45 minutes is solidified in pressurize.
Processing method of the present invention is mixed stacked reaching by bamboo wood and is enriched textured pattern, improves density simultaneously and reduces the section bar space, and the also existing single material section bar of glue consumption significantly reduces during manufacturing.The finally demould material that obtains recombinating also will be placed on and carries out modified health under the room temperature environment, with the balance internal moisture and further eliminate internal stress; Adhesive or adhesive that described " glue " is the timber bamboo wood, these all are prior art.Pressurize is solidified this pressuring method and is helped reduction reorganization material internal stress little, and the section bar performance that makes is more stable, and the modified cycle of the health after the demoulding is longer.
Described steps d also can be and is pressurized in 15~20Mpa fixed mould under the room temperature, mould is sent in the curing heating tunnel through 70~90 ℃ of low temperature, 120~140 ℃ of high temperature, slowly heat up and solidify the back cooling in 90~120 ℃ of three sections zones of low temperature, divide equally three periods zone times, was controlled at total time 8~12 hours.Adopt the room temperature pressurization to send into then to solidify and add heat tunnel and slowly heat up and solidify the processing mode of back cooling.This pressurization back fixedly is sent into mould and is solidified that to add slowly the heat up processing mode of solidifying the back cooling of heat tunnel low to the press machine requirement, help to reduce manufacturing cost, the modified cycle of later stage health that more preceding a kind of pressurize of the modified cycle of reorganization material later stage health that this compacting obtains is solidified is shorter.
Described bamboo wood is bamboo Shu Danti and/or disjunctor bamboo silk, and described timber is wood bundle and/or individual wood chip.Described wood chip is rotary-cut or slicing or sawing generation.
Described bamboo wood and timber carry out carbonization treatment before a step or dyeing is handled or sootiness is handled.Selecting any one effect in three kinds of processing modes all is color for the green wood textured pattern of controlling last formation.
Add the plant auxiliary material at random in the described d step, the plant auxiliary material accounts for 0.5~3% of gross weight.The effect of plant auxiliary material is to fill up hole, slit, improves reorganization material density, and the section bar texture that obtains at last is abundanter.
Used adhesive is true qualities or the water-soluble phenolic resin adhesive water through mixing colours and handling in the described b step.Glue is that the effect of true qualities or toning is for according to producing the needs turn colors, makes the last textured pattern of reorganization material have true qualities or other default color effect.
Bamboo wood of the present invention mixes the reorganization material and processing method is to mix the compacting section bar by bamboo wood, timber is used to control textured pattern, bamboo wood is used for filling cavity and reduces the slit, two kinds of materials are mixed the texture-rich that forms, existing single material compacting slab is more attractive in appearance, and the reorganization material of last compression moulding is evenly closely knit, intensity is high; Two kinds of materials are filled mixing mutually, and the more single material section bar of required resin added reduces with glue.
Description of drawings
Fig. 1: structural representation of the present invention.
Among the figure: 1. reorganization material, 2. bamboo wood, 3. timber, 4. walnut shell, 5. broken bamboo end.
The specific embodiment
The present invention is described further below in conjunction with description of drawings and the specific embodiment.
As shown in Figure 1, bamboo wood mixes reorganization material 1, comprise bamboo wood 2 and timber 3, described bamboo wood 2 and the timber 3 isometric and stacked at random repressed section bars that compose in the same way, wherein bamboo wood 2 is bamboo bundle and/or bamboo silk, timber 3 is wood bundle and/or individual wood chip, also filling plant auxiliary material such as walnut shell 4 and broken bamboo end 5 at random in described bamboo wood 2 and the timber 3.
Bamboo wood mixes reorganization material processing method embodiment 1, comprises the following steps of carrying out according to the order of sequence:
A. with bamboo wood 2 and timber 3 heating, dryings, the control moisture content is 10%, and described bamboo wood is bamboo Shu Danti and/or disjunctor bamboo silk, and timber is wood bundle and/or individual wood chip;
B. Hong Gan bamboo wood and timber were handled 6 minutes in true qualities or through the water-soluble phenolic resin adhesive aqueous solution soaking that toning is handled;
C. bamboo wood behind the impregnation and timber are dry again, and the control moisture content is 16%;
E. the demoulding obtains the reorganization material of compression moulding.
The pressurization that bamboo wood mixing reorganization material processing method embodiment 2 difference from Example 1 are taked in described steps d also can be and is pressurized in 15~20Mpa and the fixed mould under the room temperature, then mould is sent into and solidified in the heating tunnel through 70~90 ℃ of low temperature, 120~140 ℃ of high temperature, slowly heat up and solidify the back cooling in 90~120 ℃ of three sections zones of low temperature, three sections zone time mean allocation, total time was at 8~12 hours.
Claims (9)
1. bamboo wood mixes the reorganization material, comprises bamboo wood (2) and timber (3), it is characterized in that the isometric and stacked at random repressed section bar that composes in the same way of described bamboo wood (2) and timber (3).
2. bamboo wood according to claim 1 mixes the reorganization material, it is characterized in that described bamboo wood (2) is bamboo bundle and/or bamboo silk, and described timber (3) is wood bundle and/or individual wood chip.
3. bamboo according to claim 2 wood mixes the reorganization material, it is characterized in that in described bamboo wood (2) and the timber (3) filling plant auxiliary material at random.
4. bamboo wood according to claim 1 mixes the reorganization material processing method, comprises the following steps of carrying out according to the order of sequence:
A. with bamboo wood (2) and timber (3) heating, drying, the control moisture content is below 10%;
B. Hong Gan bamboo wood and timber impregnation were handled 2~8 minutes;
C. bamboo wood behind the impregnation and timber are dry again, and the control moisture content is below 16%;
D. the mould of packing into after weighing by weight ratio after the arrangement of Gan Zao bamboo wood and timber is suppressed;
E. the demoulding obtains the reorganization material of compression moulding;
It is characterized in that bamboo wood (2) and timber (3) after described isometric the cutting stack the mould of packing at random by extending in the same way, bamboo wood is 3~15%, and timber is 75~92%, and glue is 5~10%; Described steps d is warmed to 130~140 ℃ simultaneously for pressurization 15~25Mpa, and release pressure discharging after 45 minutes is solidified in pressurize.
5. bamboo wood according to claim 1 mixes the reorganization material processing method, comprises the following steps of carrying out according to the order of sequence:
A. with bamboo wood (2) and timber (3) heating, drying, the control moisture content is below 10%;
B. Hong Gan bamboo wood and timber impregnation were handled 2~8 minutes;
C. bamboo wood behind the impregnation and timber are dry again, and the control moisture content is below 16%;
D. the mould of packing into after weighing by weight ratio after the arrangement of Gan Zao bamboo wood and timber is suppressed;
E. the demoulding obtains the reorganization material of compression moulding;
It is characterized in that bamboo wood (2) and timber (3) after described isometric the cutting stack the mould of packing at random by extending in the same way, bamboo wood is 3~15%, and timber is 75~92%, and glue is 5~10%; Described steps d is to be pressurized under the room temperature in 15~20Mpa fixed mould, mould sent into solidify in the heating tunnel through 70~90 ℃ of low temperature, 120~140 ℃ of high temperature, slowly heat up and solidify the back cooling in 90~120 ℃ of three sections zones of low temperature, divide equally three periods zone times, was controlled at total time 8~12 hours.
6. mix the reorganization material processing method according to claim 4 or 5 described bamboo wood, it is characterized in that described bamboo wood (2) is bamboo Shu Danti and/or disjunctor bamboo silk, described timber (3) is wood bundle and/or individual wood chip.
7. bamboo wood according to claim 6 (2) and timber (3) carry out carbonization treatment before a step or dyeing is handled or sootiness is handled.
8. mix the reorganization material processing method according to claim 4 or 5 described bamboo wood, it is characterized in that adding the plant auxiliary material at random in the described d step, the plant auxiliary material accounts for 0.5~3% of gross weight.
9. mix the reorganization material processing method according to claim 4 or 5 described bamboo wood, it is characterized in that adhesive used in the described b step is true qualities or the water-soluble phenolic resin adhesive water through mixing colours and handling.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201110220929.1A CN102259371B (en) | 2011-08-03 | Bamboo wood mixed reorganization material and processing method thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN201110220929.1A CN102259371B (en) | 2011-08-03 | Bamboo wood mixed reorganization material and processing method thereof |
Publications (2)
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CN102259371A true CN102259371A (en) | 2011-11-30 |
CN102259371B CN102259371B (en) | 2016-12-14 |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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CN103112074A (en) * | 2011-12-09 | 2013-05-22 | 浙江龙泰木业有限公司 | Method for processing heavy bamboo into plates |
CN103144149A (en) * | 2011-12-06 | 2013-06-12 | 黄明法 | Laminated wood plate assembled by bamboo splints and wood chips and manufacturing method thereof |
CN103600399A (en) * | 2013-11-19 | 2014-02-26 | 桐庐竹楠木环保科技有限公司 | Bamboo plate processing technique |
CN104608223A (en) * | 2013-11-04 | 2015-05-13 | 姚秀贵 | Method for manufacturing bamboo recombined laminated wood sliced sheet |
CN105690529A (en) * | 2016-02-17 | 2016-06-22 | 江苏肯帝亚木业有限公司 | Surface color treatment process for solid wood composite floor through carbonizing |
CN108501152A (en) * | 2017-02-27 | 2018-09-07 | 天津主流科技有限公司 | A kind of technique of novel ultrahigh pressure flexibility half wet process Prepare restructuring wood |
CN108673696A (en) * | 2018-04-23 | 2018-10-19 | 铜陵昌盛家具有限责任公司 | A kind of furniture does aging method |
CN108994973A (en) * | 2018-08-21 | 2018-12-14 | 王孟平 | A method of high-density fiber timber being made using fast growing wood |
CN112659279A (en) * | 2020-12-04 | 2021-04-16 | 中国林业科学研究院木材工业研究所 | Wood recombinant material and preparation method thereof |
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CN101066604A (en) * | 2007-06-12 | 2007-11-07 | 杨湘云 | Container floorboard of reconstructed sheet and wood chip and its production process |
CN101327609A (en) * | 2007-06-22 | 2008-12-24 | 郎雨 | Method for producing ultra-long bamboo wood composite section bar |
CN101337369A (en) * | 2008-08-08 | 2009-01-07 | 孙庆佳 | Wood recombination sheet and production method thereof |
CN202241492U (en) * | 2011-08-03 | 2012-05-30 | 浙江天振竹木开发有限公司 | Bamboo-wood mixed recombinant material |
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JPS55164141A (en) * | 1979-06-09 | 1980-12-20 | Masao Takahashi | Veneer for use in plywood, dress board and the like |
JPH07195313A (en) * | 1993-12-28 | 1995-08-01 | Rinyachiyou Shinrin Sogo Kenkyusho | Method and device for manufacture of split piece laminated wood |
US5543197A (en) * | 1994-02-18 | 1996-08-06 | Plaehn; Jay | Parallel randomly stacked, stranded, laminated bamboo boards and beams |
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CN101045311A (en) * | 2006-03-27 | 2007-10-03 | 戴武兵 | Composite product made of bamboo fiber and wood fiber, and its production method |
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CN101066604A (en) * | 2007-06-12 | 2007-11-07 | 杨湘云 | Container floorboard of reconstructed sheet and wood chip and its production process |
CN101327609A (en) * | 2007-06-22 | 2008-12-24 | 郎雨 | Method for producing ultra-long bamboo wood composite section bar |
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103144149A (en) * | 2011-12-06 | 2013-06-12 | 黄明法 | Laminated wood plate assembled by bamboo splints and wood chips and manufacturing method thereof |
CN103112074A (en) * | 2011-12-09 | 2013-05-22 | 浙江龙泰木业有限公司 | Method for processing heavy bamboo into plates |
CN104608223A (en) * | 2013-11-04 | 2015-05-13 | 姚秀贵 | Method for manufacturing bamboo recombined laminated wood sliced sheet |
CN103600399A (en) * | 2013-11-19 | 2014-02-26 | 桐庐竹楠木环保科技有限公司 | Bamboo plate processing technique |
CN105690529A (en) * | 2016-02-17 | 2016-06-22 | 江苏肯帝亚木业有限公司 | Surface color treatment process for solid wood composite floor through carbonizing |
CN105690529B (en) * | 2016-02-17 | 2018-05-11 | 江苏肯帝亚木业有限公司 | A kind of carbonized solid wood composite floor board surface color treatment process |
CN108501152A (en) * | 2017-02-27 | 2018-09-07 | 天津主流科技有限公司 | A kind of technique of novel ultrahigh pressure flexibility half wet process Prepare restructuring wood |
CN108673696A (en) * | 2018-04-23 | 2018-10-19 | 铜陵昌盛家具有限责任公司 | A kind of furniture does aging method |
CN108994973A (en) * | 2018-08-21 | 2018-12-14 | 王孟平 | A method of high-density fiber timber being made using fast growing wood |
CN112659279A (en) * | 2020-12-04 | 2021-04-16 | 中国林业科学研究院木材工业研究所 | Wood recombinant material and preparation method thereof |
CN112659279B (en) * | 2020-12-04 | 2023-08-25 | 中国林业科学研究院木材工业研究所 | Wooden recombinant material and preparation method thereof |
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