CN101224590A - Man-made plate veneer unit and fabricating method thereof - Google Patents
Man-made plate veneer unit and fabricating method thereof Download PDFInfo
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- CN101224590A CN101224590A CNA2008100574496A CN200810057449A CN101224590A CN 101224590 A CN101224590 A CN 101224590A CN A2008100574496 A CNA2008100574496 A CN A2008100574496A CN 200810057449 A CN200810057449 A CN 200810057449A CN 101224590 A CN101224590 A CN 101224590A
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Abstract
The invention discloses a man-made board veneer unit and a preparation method thereof, which includes a wooden veneer, wherein, the wooden veneer is fluffed by a threaded roll and has a plurality of crushing filiform cracks and becomes a lacerated veneer curtain. Compared with the existing conventional veneer, the veneer unit provided by this invention impairs the lateral stress of the veneer unit, enhances the flowing property between the fiber bundles and increases the specific area and the filtration path. The consequent advantages are that: the internal stress of the veneer and the local stress of the board after the molding caused by the different thickness of the veneers are reduced, thus avoiding the warping and distortion, etc. of the board; the moisture expulsion resistance of the wood is greatly reduced, thus increasing the drying rate of the veneer and reducing the energy consumption in drying the veneer; the wetting property and the penetrability of the functional additives such as the adhesive, pigment, preservative, mildew inhibitor, fire retardant and so on are improved.
Description
Technical field
The present invention relates to a kind of wood veneer and preparation method thereof, particularly a kind of wood veneer for preparing the stratiform wood-based plate and preparation method thereof.
Technical background
Wood-based plate basic composition unit is fiber, wood shavings, wood bundle and veneer.The fiberboard and the particieboard that adopt fiber and wood shavings cellular construction to produce, be that the order of wood materials fiber natural alignment is all upset, rearrange again and combine that product has lost the native texture of timber, and the part physical and mechanical property reduces, and has limited its scope of application; Reorganization is wooden and the plate veneer unit structure is produced glued board or the laminated timber that adopt wood bundle cellular construction to produce, though kept the native texture structure of timber preferably, but also exist some problems, as: the reorganization wood that adopts wood bundle cellular construction to produce, have some insoluble technology and product quality problems in process of production, technical problem mainly concentrates on discongesting and mat formation equipment and technology of wood bundle; Quality problems mainly concentrate on because of a series of problems such as the inhomogeneous sheet deformation that causes of product density, moisture content and resin added, jumping silks.
At present, the glued board or the laminated timber that adopt the plate veneer unit structure to produce, issue table is following two aspects now:
1, along with the harvesting of wood is main to serving as main the transformation to fell artificial forest with the wildwood, timber ubiquity footpath level is little, intensity is low, residual stress is big, in the rotary-cut process, cause defectives such as veneer became uneven and external crack are big easily, these defectives are easy to generate local stress, and cause problems such as sheet material (particularly thin plate) warpage after the moulding, distortion;
2, along with growth in the living standard, people to the demand of wood-based plate performance by of the transformation of not function section bar material to the functional form material, need in wood-based plate, add additives such as anticorrisive agent, mould inhibitor, fire retardant and environment functional material and make it have anticorrosion, mildew-resistant, fire-retardant and improve function such as local environment, and additive is poor more than cellular constructions such as fiber, wood shavings and wood bundles in veneer surface wettability and permeability.
Therefore, develop a kind of structure of promptly not destroying the veneer large format, keep the native texture of timber, can form the new cellular construction of wood-based plate of good wet and osmotic effect again, the efficient utilization of timber is had great importance with additive.
Summary of the invention
The present invention seeks to provides a kind of plate veneer unit that is used for wood-based plate at the problems referred to above, therefore have the thread crackle of the conquassation that the veneer internal stress is released on this plate veneer unit, warpage and distortion do not take place in the wood-based plate of the layer structure for preparing with this plate veneer unit.
Another purpose of the present invention provides a kind of preparation method of above-mentioned wood-based plate plate veneer unit.
For realizing purpose of the present invention, the wood-based plate plate veneer unit that provides according to an aspect of the present invention has wood veneer, wherein separates and has the thread crackle of several conquassation through comb on the wood veneer, makes the wood-based plate plate veneer unit be lacerated veneer curtain.
Wherein, the thread crackle of conquassation is curved or straight line extension along the rift grain direction of described wood veneer, and the degree of depth of the thread crackle of conquassation is the 100%-5% of veneer thickness.
Particularly, two-sided the separating through threaded roller comb of wood veneer forms the thread crackle of described conquassation.
According to a further aspect of the invention, provide a kind of preparation method of wood-based plate plate veneer unit, comprise step: make and form the thread crackle of several conquassation on the wood veneer.
Wherein, wood veneer is veneer or the veneer strip that log forms through rotary-cut.
Wherein, the thread crackle of conquassation curved or straight line extension along the rift grain direction of described wood veneer.
Wherein, make described wood veneer form the thread crackle of described conquassation, control the 0-95% that described gap S is of a size of veneer thickness by the paired gap S that discongests between the roller.The paired cylindrical separately cylindrical shell of roller of discongesting, drum surface has the screw thread that forms the thread crackle of described conquassation.
Wherein, with paired discongest that roller is arranged to that its screw thread staggers each other or over against.The diameter of discongesting roller is 50～300mm, and rotating speed is 30～200r/min, and the spacing of discongesting the screw thread of roller is 2～100mm.
The veneer of wood-based plate is made by artificial forest fast growing wood rounding, and thickness range is 0.5～5mm, and width range is 300～1300mm, and length range is 80～2500mm, and moisture content is 12%～200%.
Advantage applies of the present invention is in the following areas:
Compare with the existing conventional veneer, plate veneer unit of the present invention has weakened the lateral stress effect of veneer, has strengthened the flowability between the wooden bundle, has increased specific area and permeation pathway, and the advantage of bringing therefrom is:
1. sheet material local stress after the moulding that reduces conventional veneer surface stress and cause because of the veneer became uneven, thereby avoided problems such as bow warping, distortion.
2. improve the utilization rate of timber, through after discongesting processing, the surface stress of veneer obtains discharging, and can reduce the loss of breaking and causing because of veneer in operations such as follow-up drying, applying glue, assembly.
3. can increase the rate of drying of veneer, the energy consumption during the minimizing veneer drying has formed the thread crackle of netted conquassation through the veneer after the networking processing, and institutional framework is loose, and specific area is bigger, and the resistance of the moisture discharge of timber is significantly reduced.
4. wetability and the permeability of functional form additive in veneer such as adhesive, pigment, anticorrisive agent, mould inhibitor, fire retardant have been improved.
Brief Description Of Drawings
Fig. 1 is the process schematic diagram of the artificial plate plate veneer unit of preparation the present invention;
Fig. 2 is the structural representation of the artificial plate plate veneer unit of the present invention;
Fig. 3 is the structural representation of discongesting roller of the artificial plate plate veneer unit of preparation the present invention;
Fig. 4 is the schematic diagram of three layers of glued board of the artificial plate plate veneer unit preparation of the present invention.
Fig. 4 a is the schematic diagram of three layers of glued board of traditional wood-based plate veneer preparation
Description of reference numerals: 1a, on discongest roller; 1b, discongest roller down; 2, plate veneer unit; 3, the thread crackle of conquassation; 3a, breaking part; 3b, continuous part; 4a, top panel; 4b, lower panel; 5, middle level plate veneer unit.
The specific embodiment
Below in conjunction with accompanying drawing, describe the specific embodiment of the present invention in detail.
Embodiment one
Eucalyptus urophylla is taken from Zhanjiang, Guangdong Province, adopts following steps to prepare plate veneer unit of the present invention:
1. rotary-cut: adopt peeler that rounding is become veneer, the thickness of veneer is 3mm, and width is 1300mm, and length is 2600mm, and moisture content is 100%;
2. discongest: use fluffer that veneer is discongested.
As shown in Figure 1, fluffer has discongests roller 1a and 1b in pairs, be controlled to and relatively rotate synchronously discongesting roller 1a, 1b, veneer is sent into two gaps of discongesting between roller 1a and the 1b according to rift grain direction (fiber of promptly controlling veneer vertically and discongest the axial approximate vertical of roller), and make veneer by discongesting roller 1a, 1b, thereby realize discongesting to veneer.
As shown in Figure 3, the main part of discongesting roller 1a and 1b up and down is a cylindrical tube, and drum surface has thread protrusion, and the helical angle of screw thread is 15-30 °, the external diameter of thread protrusion is that 100mm, flight pitch are 3mm, and the screw thread of discongesting roller 1a, 1b up and down staggers mutually or aligns.The desirable 50-300mm of the scope of thread protrusion external diameter wherein, the desirable 1-100mm of the scope of flight pitch.
When veneer by this when discongesting roller 1a and 1b, when the thread protrusion of discongesting roller 1a and 1b up and down rolls across the veneer surface, roll out several in the veneer upper and lower surface and be the thread crackle 3 of erose conquassation, the so-called irregularly shaped thread crackle 3 of adjacent conquassation that extends along the rift grain direction that is meant extends for curve, and the thread crackle 3 of conquassation not exclusively connects, be interrupted extension, the part that promptly has disconnection also has continuous part, the part that links to each other is a fibre bundle separated but still in each other's thoughts, make that plate veneer unit is network when plate veneer unit is launched perpendicular to the rift grain direction in the edge.
The gap S that control is discongested between roller 1a and the 1b in the present embodiment is 2.4mm, and the rotating speed of discongesting roller is 50r/min.
As shown in Figure 2, Fig. 2 is for discongesting the schematic diagram of handling the plate veneer unit that the back obtains by discongest roller 1a and the 1b that is threaded projection to veneer.Two surfaces up and down of plate veneer unit are formed with along veneer rift grain direction and run through the thread crackle 3 of conquassation that veneer length is extended, the thread crackle 3 of these conquassation has the breaking part and the part that links to each other, because plate veneer unit has the thread crackle 3 of such conquassation, therefore make after plate veneer unit launches to be network.
Discongest roller 1a, the adjusting range of gap S between the 1b is between 0.5～5mm, can be according to the seeds density of timber, the gap S of rod is discongested in the thickness of veneer and press ratio adjustment, the hardness of general seeds is big more, the gap is big more, veneer is thick more, gap S is big more, be generally and wait that discongesting 50%～95% of veneer thickness (is that press ratio is 50%～5%, press ratio=(veneer thickness to be discongested-discongest roller gap)/veneer thickness to be discongested, the ÷ 3 * 100%=20%) of press ratio in the present embodiment=(3-2.4) is to guarantee that the plate veneer unit that forms behind the roll extrusion veneer has roughly several that run through that veneer extends along veneer rift grain direction and is the thread crackle 3 of erose conquassation.
The rotating speed adjusting range of discongesting roller is 30～200r/min, and according to the thickness and the press ratio adjustment of veneer, thickness is big or press ratio is high, should adopt lower rotating speed, otherwise the rotating speed height is advisable.
In addition, the projection of discongesting the cylindrical tube surface of roller 1a and 1b also can be a plurality of annulus projectioies that are parallel to each other, for example the external diameter of annulus projection is that the spacing between 100mm, the annulus projection is 3mm, and the annulus projection of discongesting roller 1a, 1b up and down aligns or the setting of staggering mutually mutually.The thread crackle 3 of several conquassation that roller 1a and 1b roll out of discongesting like this is regular shape, i.e. the thread crackle 3 of conquassation along rift grain side's line extend and the thread crackle of conquassation between roughly be and be parallel to each other and extend straight.When the annulus projection of discongesting roller 1a, 1b up and down mutually to timing, the thread crackle of the conquassation that forms in the veneer upper and lower surface 3 is corresponding, when the annulus projection of discongesting roller 1a, 1b up and down staggers when being provided with mutually, the thread crackle 3 of conquassation that forms in the veneer upper and lower surface staggers mutually.
The process that adopts the artificial plate plate veneer unit of the present invention to prepare wood-based plate is described below.
This wood-based plate prepares according to following steps:
1) plate veneer unit applying glue
Adhesive adopts phenolic resin glue, and solid content is 48-55%, and the flour addition is 10%, adopts the cylinder glue applying method, and adhesive is uniformly coated on the plate veneer unit surface, and two-sided resin added is 220-320g/m
2
2) assembly, display
Get the above-mentioned plate veneer unit of one deck as central layer, will without discongest thickness be the caudal lobe eucalyptus veneer of 1.0mm as panel and backboard, make the mutually vertical assembly of machine direction of adjacent layer plate veneer unit, display 30min.
3) hot pressing of slab
Above-mentioned slab is sent in the hot press: hot pressing temperature 120-140 ℃, hot pressing pressure 1.0-2.0MPa, hot pressing time 5 minutes.
The wood-based plate that obtains comprises the panel 4a that bonds together, middle central layer 5 and backboard 4b.As shown in Figure 4.
Embodiment two
Masson pine is taken from the Pingnan, Fujian, and veneer thickness is 4mm, and the two gap S that discongest rod 1a and 1b are 3.2mm, and the flight pitch of discongesting roller is 10mm.In addition, all identical with embodiment one.
The process that adopts the artificial plate plate veneer unit of the present invention to prepare wood-based plate is described below.
1) plate veneer unit applying glue
Adhesive adopts urea-formaldehyde resin adhesive, and solid content is 48-52%, and curing agent (ammonium chloride) addition is 1.5%, after the impregnation, adopts the cylinder glue applying method, and adhesive is uniformly coated on the plate veneer unit surface, and two-sided resin added is 220-320g/m
2
2) assembly, display
Get 9 layers of above-mentioned plate veneer unit, make the mutually vertical assembly of machine direction of adjacent layer plate veneer unit, display 2h.
3) hot pressing of slab
Above-mentioned slab is sent in the hot press: hot pressing temperature 150-170 ℃, hot pressing pressure 5-6MPa, hot pressing time 0.8-1.2min/mm.
After operations such as cooling, saw limit, form glued board with network-like plate veneer unit.
Embodiment three
Poplar is taken from the Wenan, Hebei, discongests roller 1a and 1b and adopts a plurality of annulus projectioies that are parallel to each other, and the external diameter of annulus projection is that the spacing between 100mm, the annulus projection is 3mm, and the annulus projection of discongesting roller 1a, 1b up and down aligns mutually.In addition, all identical with embodiment one.
Adopt and such discongest the thread crackle 3 of several conquassation that roller 1a and 1b roll out and be regular shape, i.e. the thread crackle 3 of conquassation along rift grain side's line extend and the thread crackle of conquassation between be parallel to each other and extend straight.
The process that adopts the artificial plate plate veneer unit of the present invention to prepare wood-based plate is described below.
This wood-based plate prepares according to following steps:
1) plate veneer unit applying glue
Adhesive adopts phenolic resin glue, and solid content is 20-35%, adopts the impregnation glue applying method, and the impregnation time is 4h, and impregnation resin content is 8-12%;
2) assembly, display
Get 11 layers of above-mentioned plate veneer unit, make the machine direction of the adjacent layer plate veneer unit assembly that is parallel to each other, display 2h.
3) hot pressing of slab
Above-mentioned slab is sent in the hot press: hot pressing temperature 150-170 ℃, hot pressing pressure 4.0-5.0MPa, hot pressing time 0.8-1.2min/mm.
After operations such as cooling, saw limit, form laminated timber with network-like plate veneer unit.
Experimental example one
Timber adopts peeler that rounding is become veneer with embodiment one, and the thickness of veneer is 3mm, and width is 1300mm, and length is 2600mm, and moisture content is 100%.
As central layer, the veneer that with thickness is 1.0mm is as panel and backboard with above-mentioned one deck veneer, three layers of glued board that combine, and the preparation process of wood-based plate is with embodiment one, shown in Fig. 4 a.
The angularity of table 1 embodiment one and experimental example one kino gum plywood and bonding strength are relatively
| The plate kind | Deflection (%) | Bonding strength (MPa) |
| Embodiment one glued board | ＜2 | ＞0.70 |
| Experimental example one glued board | ＞30 | ＞0.70 |
(angularity of above glued board and bonding strength are measured with reference to GB/T 9846-2004)
Experimental example two
Timber adopts peeler that rounding is become veneer with embodiment two, and the thickness of veneer is 4mm, width is 1300mm, and length is 2600mm, then, prepare glued board with this veneer, separate the roller comb separates through the comb of embodiment two except that the veneer that adopts, all the other preparation processes are with embodiment two.This glued board intersects assembly gummed mutually by 9 layers of above-mentioned veneer adjacent layer and forms.
The angularity of table 2 embodiment two and experimental example two Larch Plywood and bonding strength are relatively
| The plate kind | Deflection (%) | Bonding strength (MPa) |
| Embodiment two glued boards | ＜0.5 | ＞0.70 |
| Experimental example two glued boards | ＞2 | ＞0.70 |
(angularity of above glued board and bonding strength are measured with reference to GB/T 9846-2004)
Experimental example three
Timber adopts peeler that rounding is become veneer with embodiment three, and the thickness of veneer is 3mm, and width is 1300mm, and length is 2600mm.
Then, prepare laminated timber with this veneer, preparation process is with embodiment three, and this laminated timber is formed by 11 layers of veneer gummed.
Table 3 embodiment three and experimental example three poplar laminated veneer lumber angularities and shear strength are relatively
| The plate kind | Deflection (%) | Horizontal shear strength (MPa) | Vertical shear intensity (MPa) |
| Embodiment three laminated timbers | ＜1 | ＞6.0 | ＞5.1 |
| Experimental example three laminated timbers | ＞3 | ＞5.5 | ＞4.7 |
(angularity of above laminated veneer lumber and shear strength are measured with reference to GB/T 20241-2006)
Claims (10)
1. a wood-based plate plate veneer unit comprises wood veneer, and wherein wood veneer has the thread crackle of several conquassation (3) through discongesting, and makes the wood-based plate plate veneer unit be lacerated veneer curtain.
2. wood-based plate plate veneer unit as claimed in claim 1 is characterized in that: the thread crackle of described conquassation (3) is curved or straight line extension along the rift grain direction of described wood veneer.
3. wood-based plate plate veneer unit as claimed in claim 1 or 2, the degree of depth that it is characterized in that the thread crackle of described conquassation is the 100%-5% of veneer thickness.
4. wood-based plate plate veneer unit as claimed in claim 1 or 2 is characterized in that two-sided the separating through threaded roller comb of described wood veneer forms the thread crackle of described conquassation (3).
5. the preparation method of a wood-based plate plate veneer unit comprises step: make and form the thread crackles of several conquassation (3) on the wood veneer.
6. preparation method as claimed in claim 5 is characterized in that: described wood veneer is veneer or the veneer strip that log forms through rotary-cut.
7. preparation method as claimed in claim 5 is characterized in that: the thread crackle of described conquassation (3) is curved or straight line extension along the rift grain direction of described wood veneer.
8. as the arbitrary described preparation method of claim 5 to 7, it is characterized in that making described wood veneer to form the thread crackle of described conquassation by the paired gap S that discongests between the roller (1a, 1b).
9. preparation method as claimed in claim 8 is characterized in that: control the 0-95% that described gap S is of a size of veneer thickness.
10. preparation method as claimed in claim 8 is characterized in that: the described paired cylindrical separately cylindrical shell of roller (1a, 1b) of discongesting, drum surface has the screw thread that forms the thread crackle of described conquassation.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010072139A1 (en) * | 2008-12-24 | 2010-07-01 | 中国林业科学研究院木材工业研究所 | Ultra thick bamboo-wood composite panel, ultra thick solid wood composite panel and manufacturing methods thereof |
| CN101863057A (en) * | 2010-05-24 | 2010-10-20 | 南京林业大学 | High-strength corrosion-resistant wood/bamboo plywood and laminated timber and production method thereof |
| CN101524858B (en) * | 2008-12-24 | 2012-04-11 | 中国林业科学研究院木材工业研究所 | Super-thick bamboo-wood composite board and producing method thereof |
| CN101524859B (en) * | 2008-12-24 | 2013-05-29 | 中国林业科学研究院木材工业研究所 | Solid-wood composite board made of super-thick single boards and producing method thereof |
| CN106426430A (en) * | 2016-11-14 | 2017-02-22 | 黄河三角洲京博化工研究院有限公司 | Wood veneer treatment method and reconstituted wood |
| CN108247810A (en) * | 2018-03-29 | 2018-07-06 | 黄河三角洲京博化工研究院有限公司 | A kind of method that Scrimber is produced using brush wood as raw material |
| CN108328340A (en) * | 2018-04-10 | 2018-07-27 | 福建农林大学 | A kind of rounding Veneer quality hierarchical intelligence identification sorting stacking system |
| CN108362702A (en) * | 2017-12-14 | 2018-08-03 | 北京木业邦科技有限公司 | A kind of defect of veneer detection method, system and equipment based on artificial intelligence |
| CN113400421A (en) * | 2021-07-06 | 2021-09-17 | 江西圣金源科技板材有限公司 | Hexagonal splice plate and processing method thereof |
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| WO2010072139A1 (en) * | 2008-12-24 | 2010-07-01 | 中国林业科学研究院木材工业研究所 | Ultra thick bamboo-wood composite panel, ultra thick solid wood composite panel and manufacturing methods thereof |
| CN101524858B (en) * | 2008-12-24 | 2012-04-11 | 中国林业科学研究院木材工业研究所 | Super-thick bamboo-wood composite board and producing method thereof |
| CN101524859B (en) * | 2008-12-24 | 2013-05-29 | 中国林业科学研究院木材工业研究所 | Solid-wood composite board made of super-thick single boards and producing method thereof |
| US8747987B2 (en) | 2008-12-24 | 2014-06-10 | Research Institute Of Wood Industry, Chinese Academy Of Forestry | Ultra thick bamboo-wood composite panel, ultra thick solid wood composite panel and manufacturing methods thereof |
| CN101863057A (en) * | 2010-05-24 | 2010-10-20 | 南京林业大学 | High-strength corrosion-resistant wood/bamboo plywood and laminated timber and production method thereof |
| CN101863057B (en) * | 2010-05-24 | 2012-11-07 | 南京林业大学 | High-strength corrosion-resistant wood/bamboo plywood and laminated timber and production method thereof |
| CN106426430A (en) * | 2016-11-14 | 2017-02-22 | 黄河三角洲京博化工研究院有限公司 | Wood veneer treatment method and reconstituted wood |
| CN108362702A (en) * | 2017-12-14 | 2018-08-03 | 北京木业邦科技有限公司 | A kind of defect of veneer detection method, system and equipment based on artificial intelligence |
| CN108247810A (en) * | 2018-03-29 | 2018-07-06 | 黄河三角洲京博化工研究院有限公司 | A kind of method that Scrimber is produced using brush wood as raw material |
| CN108328340A (en) * | 2018-04-10 | 2018-07-27 | 福建农林大学 | A kind of rounding Veneer quality hierarchical intelligence identification sorting stacking system |
| CN108328340B (en) * | 2018-04-10 | 2023-09-05 | 福建农林大学 | Log rotary-cut veneer quality classification intelligent identification sorting stacking system |
| CN113400421A (en) * | 2021-07-06 | 2021-09-17 | 江西圣金源科技板材有限公司 | Hexagonal splice plate and processing method thereof |
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| CN101224590B (en) | 2012-11-21 |
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