CN1389330A - Prepn. of core board for fine woodworker's board - Google Patents
Prepn. of core board for fine woodworker's board Download PDFInfo
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- CN1389330A CN1389330A CN 01113049 CN01113049A CN1389330A CN 1389330 A CN1389330 A CN 1389330A CN 01113049 CN01113049 CN 01113049 CN 01113049 A CN01113049 A CN 01113049A CN 1389330 A CN1389330 A CN 1389330A
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- 239000002023 wood Substances 0.000 claims abstract description 86
- 238000004519 manufacturing process Methods 0.000 claims abstract description 28
- 238000001035 drying Methods 0.000 claims abstract description 11
- 238000002360 preparation method Methods 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 239000003292 glue Substances 0.000 claims description 40
- 238000007731 hot pressing Methods 0.000 claims description 19
- 238000005516 engineering process Methods 0.000 claims description 15
- 239000000853 adhesive Substances 0.000 claims description 14
- 230000001070 adhesive effect Effects 0.000 claims description 14
- 230000015572 biosynthetic process Effects 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 11
- 239000011347 resin Substances 0.000 claims description 11
- 239000003607 modifier Substances 0.000 claims description 9
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 7
- 229920001807 Urea-formaldehyde Polymers 0.000 claims description 7
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 claims description 7
- 239000012948 isocyanate Substances 0.000 claims description 7
- 150000002513 isocyanates Chemical class 0.000 claims description 7
- 239000005011 phenolic resin Substances 0.000 claims description 7
- 229920001568 phenolic resin Polymers 0.000 claims description 7
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 6
- 230000013011 mating Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000003892 spreading Methods 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000005470 impregnation Methods 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000007514 turning Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 6
- 238000010009 beating Methods 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 244000050510 Cunninghamia lanceolata Species 0.000 description 9
- 241000219000 Populus Species 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 239000002131 composite material Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 3
- 235000011613 Pinus brutia Nutrition 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 241001116468 Cunninghamia Species 0.000 description 2
- 241000018646 Pinus brutia Species 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000011122 softwood Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
- 241001544353 Barringtonia racemosa Species 0.000 description 1
- 244000055346 Paulownia Species 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000011094 fiberboard Substances 0.000 description 1
- -1 hot pressing Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The preparation method of core plaet of fine wookworking plate is characterized by that it uses small-diameter material, intermediate cutting material and brush wood as raw material, and adopts the steps of pretreatment, breaking and beating, drying, gluing, laying to form blank, heat-pressing, modification treatment and after-processing so as to obtain the invented core plate of fine woodworking plate. Its process is reasonable, high production efficiency and low in production cost, etc.
Description
The invention belongs to the preparation method of central layer, especially a kind of preparation method of core board for fine woodworker's board is applicable to the preparation occasion of core-board.
Existing core board for fine woodworker's board is spliced by batten, and batten is got through sawing by materials such as log, short and small rim charge and rotary-cut reels.Assortment is many with low-density seeds such as softwood or soft broadleafs, pine commonly used, China fir, poplar, paulownia etc., and same core board for fine woodworker's board adopts same assortment.
The production technology of prior art core board for fine woodworker's board as shown in Figure 7.
The core board for fine woodworker's board manufacturing is divided into two kinds of the side direction splicing of core bar and not splicings, and side is pieced together central layer again after fixed thick sanding or planing, and tolerance is little, the plate surface evenness is good, can improve the quality of core-board; Side is pieced together central layer, to the machining accuracy of core bar particularly thickness strict demand is arranged, thickness deviation is excessive, can influence the flatness and the bonding strength of core-board, core bar thickness often fluctuates excessively when core is softwood, and tolerance is difficult to guarantee, influences the quality of core-board.
There is following technical problem in existing core board for fine woodworker's board manufacturing:
1, volume recovery is low.Adopt small dimension wood and log to make the core bar, because of sawing, planing etc. causes utilization rate of raw materials low, volume recovery is less than 45%, serious waste of resources, and when particularly utilizing small dimension wood directly to produce the core bar, volume recovery is lower.
2, utilize small dimension wood directly to make the core bar, its dimensional tolerance and form and position tolerance are difficult to guarantee.Adopt small dimension wood directly to produce the core bar and be generally hand feed, the charging deviation is difficult to avoid, and when first saw has deviation slightly, then the form and position tolerance of sawing core bar (copying error) is just very big thereupon; Utilize the direct coremaking bar of small dimension wood in addition, dry distortion is big.Although can remedy the part manufacturing deficiency to process technology means such as above-mentioned two problems employing brachymemma cut-ofves, scrape in order to guarantee the two sides, have only the allowance that strengthens the core bar, even so, lack datum level during because of planing core bar, form and position tolerance still is difficult to guarantee.
3, the manufacture process of thin art worker plate central layer will through repeatedly saw, operation such as plane, production technology is complicated, production efficiency is low.
Task of the present invention is the shortcoming that overcomes prior art, and the preparation method of the core board for fine woodworker's board that a kind of technology is reasonable, production efficiency is high, energy consumption is low, timber utilization rate is high, production cost is low is provided.
The invention belongs to a kind of preparation method of core board for fine woodworker's board, is to be raw material with small dimension wood, thinnings, brush wood, makes core board for fine woodworker's board by following production technology, and this preparation method roughly can be decomposed into following step:
(1) pretreatment of raw material
Small dimension wood, thinnings, brush wood are removed the peel, blocked, regulate and control its water content more than 30%;
(2) comb is separated technology
With raw materials such as above-mentioned pretreated small dimension wood, thinnings, brush wood block with preliminary treatment after, vertical or horizontal or the longitudinal and transverse compound direction of juggle is sent in the stranding rolling machine equably, turn round rubbing roller and at first juggle is turned round stranding, it is separated with late wood's faying face early along wood radial, enter then and carry out roll-in in the Continuous Roller press, juggle is vertically separated along timber substantially, form bar, the homodisperse wooden bundle of sheet or bar, the netted wood bundle of sheet.
It is the most critical link that central layer is made that wood bundle comb is separated, and this processing method is different from the production of other wood-based plates fully, and comb can be removed the peel when separating automatically, rejects knot and rotten simultaneously; Do not damage lumber fibre, separation configuration is good, the timber utilization rate height; Non-cutting way is adopted in processing, and no tool wear has reduced energy consumption, has improved productivity ratio.Comb is separated technology all has significant impact to aspects such as the physical and mechanical property of the utilization rate of timber, central layer, labor productivity, therefore, must control production technology well.
(3) drying
After being compiled into wood bundle curtain with above-mentioned wood bundle or netted wood bundle or with it, adopt the continuous jet-propelled mesh dryer or the hot plate dryer of control automatically to carry out drying, moisture content is controlled at 2～6%.
(4) applying glue
Can adopt multiple modes such as spray glue, impregnation, gluing and pouring glue, resin added is determined according to product purpose and requirement of strength, generally is controlled at 6%～13%, wherein the solid content of resin added=glue/timber oven dry weight.
During applying glue, can use urea-formaldehyde resin adhesive, phenolic resin glue, cyanurotriamide modified resin glue, polyurethane glue, isocyanate adhesive, or wherein any two kinds of glue mix use according to the purposes that product is different.
(5) assembly of mating formation
Mat formation and adopt orienting spreading or longitudinal and transverse staggered assemble pattern, generally that form is good, equivalent diameter is tiny evenly, the satisfactory wood of length is restrainted or netted wood is restrainted or wood bundle curtain places the surface, thickness is not too even, and wood bundle that length is short or netted wood bundle or wood bundle curtain are placed on sandwich layer.
(6) hot pressing
With above-mentioned slab in multi-daylight press or continous way hot press, be pressed into the burr plate of specific thickness, hot pressing temperature is controlled in 105～160 ℃ of scopes, and pressure is controlled between 1.0～2.5MPa, time is controlled between 0.45～0.75min/mm, adopts the segmentation release.
(7) modifier treatment
As required, the burr plate after the above-mentioned hot pressing can be carried out Mi Dui pressurization or cold pressing, to eliminate the residual stress that produces in the hot pressing, if less demanding to product quality, the burr plate after the hot pressing also can not carry out modifier treatment.
(8) post-production
Above-mentioned burr plate is carried out cutting edge, scrapes or sanding, and grading through check promptly makes qualified core board for fine woodworker's board.
The core board for fine woodworker's board technological process of production of the present invention as shown in Figure 8.
The present invention compared with prior art, technology is reasonable, the production efficiency height can increase substantially timber utilization rate, and comprehensive production cost is lower, be lower than particieboard, far below medium density fibre board (MDF), has the performance and the intensity that meet instructions for use, with the core-board of this central layer production, its presentation quality reaches GB/T5849-1999 Grade A or high-class product standard, has big implementary value and economic results in society.
Operation principle of the present invention is: small dimension wood, thinnings, brush wood are separated (turning round stranding, roll-in) technology through special comb, be processed into vertically constantly, laterally evenly disperse (or reticulating), substantially the wood bundle or the netted wood bundle that keep timber original structure and fundamental characteristics again, drying, applying glue again, mat formation, series of processes such as hot pressing, modified, post-production make core board for fine woodworker's board.This kind central layer is different from glued board, particieboard and fiberboard fully on the formation, structure, feature and the unit recombinant that constitute the unit, it is basic orientation and the fundamental characteristics that keeps lumber fibre in process, reduce the timber microstructure as far as possible and destroy, have the machining property of the texture structure and the similar solid wood of natural timber.
Fig. 1 is a check configuration core board for fine woodworker's board schematic diagram.
Fig. 2 respectively covers the core-board schematic diagram that two-layer veneer constitutes for the central layer upper and lower surface of Fig. 1.
Fig. 3 is composite construction 1 a core board for fine woodworker's board schematic diagram.
Fig. 4 respectively covers the core-board schematic diagram that two-layer veneer constitutes for the central layer upper and lower surface of Fig. 3.
Fig. 5 is composite construction 2 core board for fine woodworker's board schematic diagrames.
Fig. 6 respectively covers the core-board schematic diagram that two-layer veneer constitutes for the central layer upper and lower surface of Fig. 5.
Embodiment 1: single kind of timber such as China fir or poplar or pine, with the China fir is example, with the small dimension wood of China fir, thinnings, brush wood through preliminary treatment, comb separate, drying, applying glue, mat formation, operations such as assembly, hot pressing, modifier treatment (if to product quality when less demanding, also can without this operation), post-production make core board for fine woodworker's board (as Fig. 1).Respectively cover two-layer (but also one deck) veneer in the central layer upper and lower surface of Fig. 1 and constitute core-board (as Fig. 2).
(1) pretreatment of raw material
Small dimension wood, thinnings, brush wood are removed the peel, blocked, regulate and control its water content more than 30%.
(2) comb is separated technology
With raw materials such as above-mentioned pretreated small dimension wood, thinnings, brush wood block with preliminary treatment after, vertical or horizontal or the longitudinal and transverse compound direction of juggle is sent in the stranding rolling machine equably, turn round rubbing roller and at first juggle is turned round stranding, it is separated with late wood's faying face early along wood radial, enter then and carry out roll-in in the Continuous Roller press, juggle is vertically separated along timber substantially, form bar, the homodisperse wooden bundle of sheet or bar, the netted wood bundle of sheet.
It is the most critical link that central layer is made that wood bundle comb is separated, and this processing method is different from the production of other wood-based plates fully, and comb can be removed the peel when separating automatically, rejects knot and rotten simultaneously; Do not damage lumber fibre, separation configuration is good, the timber utilization rate height; Non-cutting way is adopted in processing, and no tool wear has reduced energy consumption, has improved productivity ratio.Comb is separated technology all has significant impact to aspects such as the physical and mechanical property of the utilization rate of timber, central layer, labor productivity, therefore, must control production technology well.
(3) drying
After being compiled into wood bundle curtain with above-mentioned wood bundle or netted wood bundle or with it, adopt the continuous jet-propelled mesh dryer or the hot plate dryer of control automatically to carry out drying, moisture content is controlled at 2～6%.
(4) applying glue
Can adopt multiple modes such as spray glue, impregnation, gluing and pouring glue, resin added is determined according to product purpose and requirement of strength, generally is controlled at 6%～13%, wherein the solid content of resin added=glue/timber oven dry weight.
During applying glue, can use urea-formaldehyde resin adhesive, phenolic resin glue, cyanurotriamide modified resin glue, polyurethane glue, isocyanate adhesive according to the purposes that product is different, perhaps wherein any two kinds of adhesive mix use.
(5) assembly of mating formation
Mat formation and adopt orienting spreading or longitudinal and transverse staggered assemble pattern, generally that form is good, equivalent diameter is tiny evenly, the satisfactory wood of length is restrainted or netted wood is restrainted or wood bundle curtain places the surface, thickness is not too even, and wood bundle that length is short or netted wood bundle or wood bundle curtain are placed on sandwich layer.
(6) hot pressing
With above-mentioned slab in multi-daylight press or continous way hot press, be pressed into the burr plate of specific thickness, hot pressing temperature is controlled in 105～160 ℃ of scopes, and pressure is controlled between 1.0～2.5MPa, time is controlled between 0.45～0.75min/mm, adopts the segmentation release.
(7) modifier treatment
As required, the burr plate after the above-mentioned hot pressing can be carried out Mi Dui pressurization or cold pressing, to eliminate the residual stress that produces in the hot pressing, if less demanding to product quality, the burr plate after the hot pressing also can not carry out modifier treatment;
(8) post-production
Above-mentioned burr plate is carried out cutting edge, scrapes or sanding, and grading through check promptly makes qualified core board for fine woodworker's board.
Embodiment 2: any two kinds of timber are (as China fir and poplar, China fir and pine etc.) small dimension wood, thinnings, brush wood through preliminary treatment, comb separate, operations such as drying, applying glue, the assembly of mating formation, hot pressing, modifier treatment (if less demanding to product quality, also can be without this operation), post-production make core board for fine woodworker's board (as Fig. 3, Fig. 5).Respectively cover two-layer (but also one deck) veneer in the central layer upper and lower surface of Fig. 3, Fig. 5 and constitute core-board (as Fig. 4, Fig. 6).
Wherein: preliminary treatment, comb are separated, drying, applying glue, hot pressing, modifier treatment, post-production be with embodiment 1, the assembly of mating formation is different from embodiment 1: at first, wood bundle that two kinds of timber is made or netted wood bundle or with its wood bundle curtain of weaving into adopt orienting spreading and make composite construction.At this moment, if seeds 1 are China firs, seeds 2 are poplars, and its upper and lower surface is Chinese fir wood bunch or netted wood bundle or wood bundle curtain so, and the intermediate layer is poplar wood bundle or netted wood bundle or wood bundle curtain; Otherwise the intermediate layer is China fir in this way, and upper and lower top layer is poplar (as Fig. 3);
Secondly, wood bundle or the netted wooden wood bundle curtain of restrainting or weaving into two kinds of timber are made carry out longitudinal and transverse staggered assembly and make composite construction.At this moment, if seeds 1 are China firs, seeds 2 are poplars, and poplar wood bundle or netted wood bundle or wood bundle curtain are placed on the intermediate layer so, and its upper and lower top layer is exactly Chinese fir wood bunch or netted wood bundle or wood bundle curtain; (see figure 5) that vice versa.
During embodiment 3 applying glues, use according to the different available urea-formaldehyde resin adhesives of purposes, phenolic resin glue, cyanurotriamide modified resin glue, polyurethane adhesive, isocyanate glue or wherein any two kinds of adhesive mixing of product:
If made core-board is indoor non-structure material, when preparing, central layer only adds a small amount of phenolic resin glue with urea-formaldehyde resin adhesive or in urea-formaldehyde resin adhesive, and perhaps add a small amount of isocyanate glue and mix use; If made core-board is outdoor use material or doors structure when using material, central layer preparation phenolic resin glue commonly used, also available isocyanate glue, cyanurotriamide modified resin glue perhaps add a small amount of urea-formaldehyde resin adhesive in phenolic resin glue, cyanurotriamide modified resin glue or a small amount of isocyanate glue mixes use.
Claims (1)
1, a kind of preparation method of core board for fine woodworker's board is characterized in that with small dimension wood, thinnings, brush wood be raw material, makes core board for fine woodworker's board by following production technology, and this preparation method is broadly divided into following step:
(1) preliminary treatment
Small dimension wood, thinnings, brush wood are removed the peel, blocked, regulate and control its moisture content more than 30%;
(2) comb is separated technology
With above-mentioned pretreated juggle, vertical or horizontal or longitudinal and transverse compound direction is sent into and is rubbed with the hands in the rolling machine, through the rubbing roller of turning round of rubbing the rolling machine with the hands juggle is turned round stranding, it is separated with late wood's faying face early along wood radial, enter then and carry out roll-in in the Continuous Roller press, juggle is vertically separated along timber substantially, form bar, the homodisperse wooden bundle of sheet or bar, the netted wood bundle of sheet;
(3) drying
After being compiled into wood bundle curtain with above-mentioned wood bundle or netted wood bundle or with it, adopt the jet mesh dryer of continous way or the hot plate dryer of control automatically to carry out drying, make its moisture content be controlled at 2%～6%;
(4) applying glue
Can adopt spray glue, impregnation, gluing and pouring glue mode, resin added is controlled at 6～13% according to product purpose and requirement of strength;
During applying glue, can use urea-formaldehyde resin adhesive, phenolic resin glue, cyanurotriamide modified resin glue, polyurethane glue, isocyanate adhesive according to the different purposes of product, perhaps wherein any two kinds of adhesive mix use;
(5) assembly of mating formation
Mat formation and adopt orienting spreading or longitudinal and transverse staggered assemble pattern, form is good, equivalent diameter is tiny evenly, the satisfactory wood of length is restrainted or netted wood is restrainted or wood bundle curtain places the surface, thickness is not too even, and wood bundle that length is short or netted wood bundle or wood bundle curtain are placed on sandwich layer;
(6) hot pressing
With above-mentioned slab in multi-daylight press or continous way hot press, be pressed into the burr plate of specific thickness, hot pressing temperature is controlled in 105～160 ℃ of scopes, and pressure is controlled between 1.0～2.5MPa, time is controlled between 0.45～0.75min/mm, adopts the segmentation release;
(7) modifier treatment
As required, the burr plate after the above-mentioned hot pressing can be carried out Mi Dui pressurization or cold pressing, to eliminate the residual stress that produces in the hot pressing, if less demanding to product quality, the burr plate after the hot pressing also can not carry out modifier treatment;
(8) post-production
Above-mentioned burr plate is carried out cutting edge, scrapes or sanding, and grading through check promptly makes qualified core board for fine woodworker's board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01113049 CN1389330A (en) | 2001-06-01 | 2001-06-01 | Prepn. of core board for fine woodworker's board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01113049 CN1389330A (en) | 2001-06-01 | 2001-06-01 | Prepn. of core board for fine woodworker's board |
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| CN1389330A true CN1389330A (en) | 2003-01-08 |
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| CN 01113049 Pending CN1389330A (en) | 2001-06-01 | 2001-06-01 | Prepn. of core board for fine woodworker's board |
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| CN100335250C (en) * | 2005-03-12 | 2007-09-05 | 余金枢 | Method for producing ultrafine cabinetwork board |
| CN100345668C (en) * | 2004-12-14 | 2007-10-31 | 郎妙金 | Bamboo-wood composite section bar production method |
| CN100354087C (en) * | 2005-06-13 | 2007-12-12 | 浙江林学院 | Small-diameter wood sheared integrating timber production method |
| CN100371149C (en) * | 2005-10-26 | 2008-02-27 | 浙江林学院 | Fine wooden strip producing process |
| CN100493873C (en) * | 2007-05-15 | 2009-06-03 | 浙江林学院 | Rod-shape wood bunch automatic positioning spreading method and spreading head |
| CN101863063A (en) * | 2010-05-24 | 2010-10-20 | 福建农林大学 | Method for processing fir wood intermediate cutting material for manufacturing high-grade zebra wooden yacht |
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| CN100335250C (en) * | 2005-03-12 | 2007-09-05 | 余金枢 | Method for producing ultrafine cabinetwork board |
| CN100354087C (en) * | 2005-06-13 | 2007-12-12 | 浙江林学院 | Small-diameter wood sheared integrating timber production method |
| CN100371149C (en) * | 2005-10-26 | 2008-02-27 | 浙江林学院 | Fine wooden strip producing process |
| CN100493873C (en) * | 2007-05-15 | 2009-06-03 | 浙江林学院 | Rod-shape wood bunch automatic positioning spreading method and spreading head |
| CN101524857B (en) * | 2008-12-24 | 2014-04-02 | 中国林业科学研究院木材工业研究所 | Aldehyde-free veneer and producing method thereof |
| CN101524864B (en) * | 2009-02-20 | 2013-04-24 | 中国林业科学研究院木材工业研究所 | Large piece of bamboo bundle curtain artificial board and fabricating method thereof |
| CN101863063A (en) * | 2010-05-24 | 2010-10-20 | 福建农林大学 | Method for processing fir wood intermediate cutting material for manufacturing high-grade zebra wooden yacht |
| CN101863063B (en) * | 2010-05-24 | 2011-09-07 | 福建农林大学 | Method for processing fir wood intermediate cutting material for manufacturing high-grade zebra wooden yacht |
| CN102085677A (en) * | 2010-11-23 | 2011-06-08 | 南京林业大学 | New process for producing wooden composite material by using waste and used plywood cement templates |
| CN102085677B (en) * | 2010-11-23 | 2013-05-22 | 南京林业大学 | New process for producing wooden composite material by using waste and used plywood cement templates |
| CN102092071A (en) * | 2010-12-10 | 2011-06-15 | 湖南福湘木业有限责任公司 | Laminated wood board processing technique capable of improving utilization rate of board core material |
| WO2012167468A1 (en) * | 2011-06-07 | 2012-12-13 | Dai Wubing | Method for manufacturing plywood |
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