CN109591122A - A kind of method of wood materials vacuum compression densification - Google Patents
A kind of method of wood materials vacuum compression densification Download PDFInfo
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- CN109591122A CN109591122A CN201910107522.4A CN201910107522A CN109591122A CN 109591122 A CN109591122 A CN 109591122A CN 201910107522 A CN201910107522 A CN 201910107522A CN 109591122 A CN109591122 A CN 109591122A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
Abstract
The invention discloses a kind of methods of wood materials vacuum compression densification, belong to wood materials production preparation field.The present invention is by carrying out hot pressing setting processing to timber under vacuum conditions, and treated, and timber specific modulus is big, and the hot pressing fixing time for solving existing wood compression densification technologies is long, the technical problems such as manufacture efficiency is low, discoloration and dimensional instability；The compression compactization manufacture for carrying out wood materials under vacuum conditions, also improves the bonding strength of wooden glueing material.
Description
The present patent application is divisional application, parent application number: 201711474145.5, female case denomination of invention: a kind of wooden
The method of material compression compact, parent application day: on December 29th, 2017.
Technical field
The invention belongs to wood materials to produce preparation field, more specifically to a kind of wood compression densification and
The method for improving composite wooden material bonding strength.
Background technique
53,250,000 hectares of the artificial Linda in China, ranks first in the world.Compared with wildwood, artificial forest has growth fast, raw
The features such as long amount is high, exploitation is convenient and obtains more stable benefit morning, timber and lumber standards, quality, utilization easy to process.But artificial forest
Make since there are some material defects if fast-growing Chinese fir material is poor, short texture, intensity and hardness are low, not wear-resisting, easy to moisture absorption
Its industrial applications is very restricted.Therefore, the correlated performance for improving fast growing wood is to expand its utilization scope master
Want one of method.
Common timber enhanced processing method has resin infusion method and compression compact method.Impregnation timber is most widely square
Method is vacuum impregnation method, i.e., timber first vacuumizes under certain condition of negative pressure, then utilizes process tank internal and external pressure difference by stain
Resin injects timber in tank, and is kept for the corresponding time.But timber is a kind of heterogeneous natural material of porosity, and respectively to different
Property it is big, so resin is often uneven in the distribution of wood internal using after various low-molecular-weight resin impregnation timber,
And the chemical reagent being added has certain influence to human health and earth environment.But in the prior art under vacuum state at dipping
Timber is managed, and takes pressurization (hot pressing), does not have relevant document to record, if simply simultaneously by impregnation timber under vacuum state
Hot-pressing processing is carried out, the effect of dipping and hot pressing is often not achieved, while chemical reagent can not be solved to human health and ground
The problems such as ball environmental pollution.
Compression compact is a kind of high-quality technology utilized of bad material.Fast growing wood compression compact is that one of its modification is important
Direction, the purpose is to improve its related physical, mechanical property.After fast growing wood is handled by compression compactization, it is hard that it can be improved
Degree, wearability and dimensional stability, so as to partially broadleaf be replaced to use.
Conventional wood compression densification technologies mainly include sofening treatment, transverse compression and the compressed deformation before compression
Three steps are fixed, technology production time length, low efficiency.Although the density of wood after the technical treatment increases, compare mould
Amount does not improve or even the specific modulus of timber can reduce instead, and therefore, the performance of timber is not promoted well.In addition,
In wood compression compacting process, polysaccharide, hemicellulose and extract in Wood chemical composition have occurred degradation, oxidation,
A series of chemical changes such as polycondensation, coloring matter content increases, so that wood surface color burn, affects the beauty of product
Sight and quality.
Chinese invention patent, publication number: publication date: CN102198679B on March 26th, 2014, discloses a kind of fast-growing
The method of flooring board enhancing processing.This method is handled according to following order: a. is close by fast-growing floor base material using hot press
Realification；B. the fast-growing plate of densification is realized into surface carbonation on heating platen；C. radio frequency plasma method of modifying is used, is allowed
Nitrogen plasma carries out gas-solid two-phase chemistry lamination with carbon and is nitrogenized.Through the inventive method treated fast-growing flooring board
Have the advantages that surface hardness is high, wear-resisting, the disadvantages are as follows: the invention from it is closely knit to carbonization again to nitridation, complex process, processing
Period is long, takes 80~120 DEG C in hot pressing temperature, and hot pressing pressure takes 0.8~2.0MPa, and the time takes and carries out under conditions of 5~15min
Heat pressing compact, plate will appear rebound, and dimensional stability is bad；In addition, in 200 DEG C or more of high temperature after the processing of substrate densification
Carbonization treatment is carried out to it under environment, the texture color for easily causing wood surface to change colour, thus destroying China fir itself.
Chinese invention patent, publication number: publication date: 101875207 A of CN discloses low-quality speed on November 3rd, 2010
Growing log in situ is closely knit and the processing method of bacteriostat degerming functions, comprising: by pressurization and vacuumizes in vacuum pressed tank
Filler will be planted low-quality fast growing wood progress closely knit and antibacterial bacteriostatic in situ and handled by technique.The invention low operation temperature, to timber
Without compression, belong in situ closely knit.But disadvantage is that: (1) invention needs to add additional filler, thus increases
Extra-pay, higher cost；(2) time of filler infiltration wood internal is longer, thus the entire sheet fabrication period
It is longer；(3) timber density after impregnating substantially increases, though Deflection Modulus of Elasticity improves 36.2%, the specific modulus of material
It substantially reduces, affects the performance of material.
Chinese invention patent, publication number: CN103433982B, publication date: on August 5th, 2015 discloses cross-bedding pressing plate
Material processing method, specifically include laminate prepare, composite modifier configuration, the modified enhancing of surface layer laminate, laminate refer to connect, laminate is applied
Glue, assembly, compacting, post-production.The modified enhancing technique of surface layer laminate include surface layer laminate is put into it is right in closed pressurized tank
Pressurized tank, which is repeated, to be vacuumized and pressurized treatments, composite modifier are impregnated under pressure in the laminate of surface layer, for row
The extra composite modifier in ejecting plate surface layer, then to seal-off pressure tank vacuumize process.By modified enhancing in assembly, pressing process
Laminate is placed in surface layer and carries out assembly according to the mutually perpendicular mode of grain direction of adjacent laminate, and cold pressing is put into a press after assembly
Molding, while being subject to lateral pressure.The disadvantages are as follows: the time that (1) composite modifier penetrates into wood internal is longer thus whole
A sheet fabrication period is also longer；(2) plate is placed in pressurized tank and vacuumizes progress impregnation and is modified by the invention, then will
Treated that plate carries out press compression enhancing processing in a normal state for impregnating by pressure, and for fast-growing Chinese fir etc., itself pit is close
Real timber, modifying agent is difficult to penetrate into, and material surface property is also changed after impregnation.There are still conventional dippings
The various defects of processing.
In addition, the formation of bonding strength is a complicated process when wood gluing, it is broadly divided into following 5 steps: stream
Dynamic, transmitting, infiltration, wetting and solidification.The production of glued board at present is frequently with urea-formaldehyde resin adhesive, in glued board or other wood
In composite material manufacturing process, since timber is porous material, adhesive can be aggravated in hot pressing and penetrated at veneer, glue
It closes the gluing agent content at layer to reduce, seriously affects glued effect, thereby reduce the final bonding strength of glued board.This is also
The above-mentioned prior art or the industry technical problem also to be solved.
Summary of the invention
1, it to solve the problems, such as
For defect present in existing impregnation and wood compression densification technology and conventional Wood composite
The problems such as production cycle is long in material manufacture processing, high production cost, production equipment utilization efficiency is low and product mechanical property is poor,
The invention discloses a kind of methods of wood materials compression compact, can play compression, fixation and setting to wood materials simultaneously
Purpose, and the mechanical strengths of wood materials fully meets requirements after handling, the standby compressed wood material with the common hot pressing of use
Material is compared, and color difference is small, and bending strength is high, and specific modulus is big, while also improving the bonding strength of existing wooden glueing material.
2, technical solution
To solve the above problems, the present invention adopts the following technical scheme that:
A kind of wood materials compression compact method, comprising the following steps:
It pressurizes to wood materials in vacuum state；Moulding pressure takes 1-4MPa；After reaching pressing time, vacuum is gone,
Carry out release, cooling.
Preferably, wood materials are carried out in vacuum state hot pressing；The hot pressing temperature takes 100 DEG C -220 DEG C, hot pressing
Pressure takes 1-4MPa；After reaching hot pressing time, vacuum is gone, carries out release, cooling.
It is described in vacuum state hot pressing, vacuum degree is -0.1MPa~-0.09MPa.
Wood materials compression compact method and step further include wood materials are dried and sanding surface processing；To dry
Treated that wood materials are cut for the processing of dry and sanding surface.
The wood materials are timber or composite wooden material, and the composite wooden material is glued board, structure collection
It becomes a useful person, particieboard or structural veneer laminated timber.
The drying and sanding surface processing treated lumber thickness are 18-22mm；Whole moisture content is 10 ± 2%.
The wood materials are that timber first vacuumizes before compression, and vacuum degree is -0.1MPa~-0.09MPa, the heat
Pressure temperature takes 160 DEG C -220 DEG C, and hot pressing time takes 15min-45min, and hot pressing pressure takes 2-4MPa；Allow entire wood compression close
Realification process is always all in vacuum state.
The manufacturing method of wood materials compression compactization raising wood materials bonding strength, comprising the following steps:
(1) by timber rotary-cut or slicing at Wooden veneer；
(2) to treated in step (1), Wooden veneer is dried；
(3) to treated in step (2), Wooden veneer carries out covering with paint adhesive；
(4) to treated in step (3), Wooden veneer carries out assembly；
(5) to treated in step (4), slab carries out vacuum hotpressing, and vacuum degree is -0.1MPa~-0.09MPa, hot pressing
Temperature takes 100 DEG C -120 DEG C, and hot pressing time takes 50-90s/mm, and hot pressing pressure takes 1-2MPa；
(6) to treated in step (5) slab, after reaching hot pressing time, vacuum, release, cooling, cutting edge and sanding are gone
Processing, is finally made the glued board of high bonding strength.
Wooden veneer whole moisture content after being dried is 8 ± 3% in the step (2).
The adhesive is urea-formaldehyde resin adhesive at the step (3), and two-sided resin added is 200-300g/m2,
Slab described in step (4) is vertical, and-cross-indulges three layers or odd-level assemble pattern.
3, beneficial effect
Compared with the prior art, the invention has the benefit that
(1) method of wood materials compression compact provided by the invention increases the surface layer density of material by compression,
Mechanical strength is improved, while improving the stability of material.Vacuumize process makes entire hot pressing in the condition of anaerobic
Lower progress, reduces the degradation of content of material, guarantees that significant change will not occur for the wood color of timber, while accelerating timber again
The migration of internal moisture, it is certain as losing for hydrone causes the hydrogen bond of molecule between wood chemical compositions and reconfigure
Chemical group changes, and forms crosslinked action, under the effect of external force, so that the directionality between microfibril is improved,
Crystallinity improves, and improves compression effectiveness.Softening and Partial digestion occur timber for lignin and hemicellulose under the high temperature conditions, micro-
Fibril easily moves, and constitutes the molecular moiety of stroma ground substance by partial cutoff, and internal stress is relaxed rapidly, when temperature reduces
When, stroma ground substance returns to glassy state from viscous state again, it is suppressed that the flexible deformation of microfibril, compressive deformation are fixed.
Thus the present invention realizes hot pressing, fixation and setting function simultaneously, and solving ordinary hot, to depress timber easy to change and stability is poor
Problem；
(2) the secondly method of wood materials compression compact of the present invention, the boiling point of liquid is lower under vacuum condition, unit bodies
Molecular number is greatly reduced in product, and the molecular collision probability being evaporated reduces, that is, is not easy to return after being evaporated.In vacuum condition
Under to timber carry out high temperature hot pressing processing when, vacuum environment pressure is lower, by means of differential pressure action, easily by timber moisture steam
Out, under the combination of stringent pressure and temperature, timber densification is promoted；
(3) method of wood materials densification provided by the invention, compared with prior art, without any additive to wood
Material carries out impregnation etc., thus entire working process process is environmentally protective, thus, wood materials obtained are free of nuisance
Matter, and the timber densification time of the present invention is very short, facilitates the raising of production efficiency；
(4) method of wood materials densification provided by the invention, wood materials are after vacuum hotpressing is handled, solid wood board
Hemicellulose inside material is degraded, and mass loss rate increases, and internal porosity reduces, the wood for being included in unit volume
The quality of material cell wall substance increases, and density of wood increases therewith, and the effective active area for bearing external force becomes larger, through the short time and
Under hot pressing condition, the Deflection Modulus of Elasticity of material is greatly improved after rapid hot pressing, and the increase degree of elasticity modulus is greater than density
Increase degree, the specific modulus of material substantially increases；
(5) method of wood materials densification provided by the invention, while wood materials bonding strength is also improved, using true
Empty hot-pressing technique, with regard to carrying out vacuumize process before hot pressing, the boiling point of substance is reduced, and wood internal moisture can be in lower temperature
Under reach boiling point vaporization, wood surface water evaporation rate accelerate, accelerate speed of the wood internal moisture to external migration, thus
So that glue-line is easier to solidify, improves the bonding strength of wood materials and shorten gluing time.
(6) method provided by the invention for improving wood materials bonding strength, using vacuum hot pressing technique, material is in anaerobic
Under conditions of carry out glued, reduce the palliating degradation degree of timber content, wood color made not change；Various solid matters are big
In air pressure environment, surface can adsorb some gases, when being in vacuum, since density of gas molecules reduces, and the gas being adsorbed
It can release into environment, the burst size of methanal of composite wooden material can be also reduced using vacuum technique；It is also prevented from simultaneously
Adhesive generates unfavorable chemical reaction at high temperature, is further ensured that bonding quality.
Specific embodiment
The present invention is further described below combined with specific embodiments below.
Embodiment 1
The specific test procedure of this experiment is as follows:
1) be dried to fir wood plank and sanding surface is handled: by with a thickness of the fir wood plank of 23-24mm, sanding is extremely
22mm, moisture content is 10% after drying.
2) to the processing of dry and sanding surface, treated that fir wood plank is cut: using sizing saw machine be made 200mm ×
The China fir test specimen of 100mm × 20mm (axial × tangential × radial).The rulers such as precise measurement test specimen quality, width, thickness and length
Very little (position when measurement thickness is marked) record and numbered to the data of measurement test specimen accurately to 0.02mm
It arranges.
3) numbered test specimen compression processing is carried out to test specimen under vacuum and condition of normal pressure respectively using hot press (to hang down
Stumpage tangential compression): the pressure of high temperature hot pressing contracting processing is 2MPa, compression ratio 30%, hot pressing time 30min, hot pressing
Temperature is 180 DEG C, 200 DEG C and 220 DEG C three kinds.After hot pressing time to be achieved, vacuum, removal pressure are gone, it is cooling, most final pressure is made
Contracting wood.Wherein, it goes first close vacuum valve when vacuum hotpressing, opens vacuum (-tight) housing, then carry out release again.
4) thickness of test specimen after compression processing (measuring in mark) and weight are measured and is recorded.
5) it measures and calculates compressed using CIE (1976) L*a*b colour system that International Commission on Illumination is recommended
The value of chromatism of test specimen and untreated test specimen.
6) Deflection Modulus of Elasticity detection is carried out to compressed test specimen using omnipotent mechanics machine.
Wood materials Deflection Modulus of Elasticity detection data (the GB/T 1936.2- obtained according to the process of embodiment 1
2009), as shown in table 1.
The detection data of 1 material Deflection Modulus of Elasticity of table
The detection data of 2 test specimen value of chromatism of table
The specific modulus data of 3 vacuum hotpressing test specimen of table
Result of implementation explanation carries out compression processing to timber under vacuum conditions, can effectively improve the bending resistance springform of material
Amount and specific modulus, and compared with conventional compression material, material surface color color difference is small.
Embodiment 2
With embodiment 1, difference is this test implementation steps,
1) sawing: will be with a thickness of the fir wood plank of 21-23mm, sanding to 20mm, moisture content 10%.
2) vacuum hotpressing: hot pressing pressure 2MPa, compression ratio 30%, hot pressing time 15min, hot pressing temperature 180
DEG C, 200 DEG C and 220 DEG C three kinds.
4) release.
The wood materials detection data obtained according to the process of embodiment 2 is as follows.
4 experimental test data of table
Vacuum compression time in embodiment 2 is compared with shortening 15min, compared with Example 1, compressed wood in embodiment 1
Intensity improving rate is lower, and value of chromatism is smaller, i.e., surface color is more difficult changes.
Embodiment 3
If step is with embodiment 2, difference is sanding to 18mm, and moisture content 12%, compression ratio when vacuum hotpressing is
20%, compression time 30min.
Shown in the detection data table 5 of the wood materials obtained according to the process of embodiment 3:
5 experimental test data of table
Embodiment 4
For step with embodiment 2, difference is when vacuum hotpressing is closely knit that vacuum compression rate is 10%, compression time 30min,
Hot pressing temperature is 200 DEG C.Obtained compressed wood is detected according to relevant regulations and standard.Result of implementation shows vacuum compression
Treated test specimen Deflection Modulus of Elasticity and specific modulus have been respectively increased 42.77%, 20.91% compared with material, and value of chromatism is
5.92%.
Embodiment 5
With embodiment 2, difference is step, and test specimen is 8% by drying control moisture content before compression processing, hot pressing
Temperature is 180 DEG C, and obtained compressed wood is detected according to relevant regulations and standard.Vacuum hotpressing treated test specimen bending resistance
Elasticity modulus and specific modulus have been respectively increased 33.36%, 10.26% compared with material, value of chromatism 6.11%.
Embodiment 6
With embodiment 2, difference is step, and test specimen is 10% by drying control moisture content before compression processing, hot pressing
Temperature is 160 DEG C, and compression time is that the compressed wood that 45min is obtained is detected according to relevant regulations and standard.Vacuum hotpressing
Treated test specimen Deflection Modulus of Elasticity and specific modulus have been respectively increased 20.64%, 7.55% compared with material, and value of chromatism is
5.78%.
Embodiment 7
With embodiment 2, difference is step, and test specimen is 10% by drying control moisture content, adds before compression processing
Pressure, compression time are that the compressed wood that 45min is obtained is detected according to relevant regulations and standard.Vacuum hotpressing treated examination
Part Deflection Modulus of Elasticity and specific modulus have also respectively obtained raising compared with material.
Embodiment 8
A kind of wood materials compression compact method, includes the following steps:
1) slicing and drying: the good China fir veneer of slicing (no crack degree), with a thickness of the Wooden veneer of 1.6-1.8mm,
It is carried out in drying box, drying temperature is 50 DEG C, time 12h, and whole moisture content is 8%.
2) gluing: the Wooden veneer after drying is subjected to covering with paint adhesive, two-sided resin added is 300g/m2。
3) assembly :-horizontal-according to the vertical of glued board to indulge three layers of assemble pattern, prepare the slab of three layers of glued board.
4) vacuum hotpressing: after slab is put into press, closing vacuum (-tight) housing, vacuumize, and hot pressing temperature is 110 DEG C, slab pressure
Power is 1.0MPa, hot pressing time 60s/mm.
5) release: after reaching hot pressing time, going vacuum, and hot pressing terminates, and slab is taken out in release, then cooling, cutting edge and sand
Glued board is made in light processing.
According to the glued board detection data (GB/T 17657-2013) for the wood materials that the process of embodiment 1 obtains, such as table
Shown in 6:
The bonding strength detection data of 6 wood materials glued board of table
This result of implementation shows to carry out hot pressing under vacuum conditions, is remarkably improved the bonding strength of glued board.Using true
Empty hot-pressing processing, hence it is evident that improve wood materials bonding strength.
Embodiment 9
With embodiment 6, difference is step, and veneer is 11% by drying control moisture content, when gluing two-sided resin added
For 280g/m2, vacuum hotpressing temperature is 120 DEG C, and slab pressure is 1.5MPa, vacuum hotpressing time 50s/mm, obtained gluing
Plate is detected according to relevant regulations and standard, and bonding strength reaches 1.956MPa, is improved compared to the China for plywood under normal pressure
42.13%.
Embodiment 10
With embodiment 6, difference is step, and veneer is 5% by drying control moisture content, and when gluing, two-sided resin added was
250g/m2, vacuum hotpressing temperature is 100 DEG C, vacuum hotpressing time 90s/mm, and obtained glued board reaches through detecting bonding strength
2.115MPa improves 24.6% compared to the China for plywood under normal pressure.
Embodiment 11
With embodiment 6, difference is step, and China fir veneer thickness is 2mm, is 9% by drying control moisture content, gluing
When two-sided resin added be 240g/m2, vacuum hotpressing temperature is 90 DEG C, and vacuum hotpressing time 60s/mm, obtained glued board is through examining
It surveys bonding strength and reaches 1.879MPa, improve 37.36% compared to the China for plywood under normal pressure.
Embodiment 12
A kind of wood materials compression compact method, includes the following steps:
1) slicing and drying: the good board using poplar board of slicing (no crack degree), with a thickness of the Wooden veneer of 1.6-1.8mm,
It is carried out in drying box, drying temperature is 50 DEG C, time 12h, and whole moisture content is 10%.
2) gluing: the Wooden veneer after drying is subjected to covering with paint adhesive, adhesive is phenolic resin, and solid content is
65%, two-sided resin added is 300g/m2。
3) according to the assemble pattern of laminated veneer lumber, 15 layers of structural veneer laminated timber assembly: are prepared.
4) vacuum hotpressing: after slab is put into press, closing vacuum (-tight) housing, vacuumize, and hot pressing temperature is 145 DEG C, slab pressure
Power is 1.0MPa, hot pressing time 60s/mm.
5) release: after reaching hot pressing time, going vacuum, and hot pressing terminates, and slab is taken out in release, then cooling, cutting edge and sand
Structural veneer laminated timber is made in light processing.
The structural veneer laminated timber detection data (GB/T 20241-2006) obtained according to the process of embodiment 12, such as table 7
It is shown:
The bonding strength detection data of 7 veneer level material of table
Embodiment 13:
The manufacturing method for improving wood materials laminated wood bonding strength, includes the following steps:
1) the pinus sylvestris var. mongolica sawn timber (width 140mm, thickness 10mm) made, moisture content 12% saw lumber: are sawed.
2) gluing: covering with paint adhesive is carried out to the pinus sylvestris var. mongolica after drying, adhesive is resorcinol-phenol-formaldehyde copolymerization
Resin, solid content 50%, two-sided resin added are 260g/m2。
3) assembly: according to the assemble pattern of integrated timber, three-decker integrated timber is prepared.
4) vacuum hotpressing: after slab is put into press, closing vacuum (-tight) housing, vacuumize, and hot pressing temperature is 145 DEG C, slab list
Position pressure is 1.0MPa, hot pressing time 60s/mm.
5) release: after reaching hot pressing time, going vacuum, and hot pressing terminates, and slab is taken out in release, then cooling, cutting edge and sand
Structural glulam is made in light processing.
GB/T 26899-2011 is detected the integrated timber obtained according to the process of embodiment 13 according to national standards, is led to
It crosses the glue-line shear strength (6.74MPa) that is averaged of integrated timber made of vacuum hotpressing to meet the requirements of the standard (6.0MPa), and is higher than normal
Depress produced integrated timber bonding strength.
Embodiment 14
Composite wooden material is particieboard, and for preparation step with conventional particieboard preparation method, adhesive is phenolic resin glue,
Difference is vacuum hotpressing: after slab is put into press, closing vacuum (-tight) housing, vacuumizes, hot pressing temperature is 145 DEG C, slab unit
Pressure is 1.0MPa, hot pressing time 60s/mm.It is detected according to the particieboard that the process of embodiment 14 obtains, passes through vacuum
The glue-line shear strength that is averaged of particieboard made of hot pressing is met the requirements of the standard, and it is glued strong to be higher than the particieboard produced under normal pressure
Degree.
Claims (10)
1. a kind of method of wood materials vacuum compression densification, which comprises the following steps:
Hot pressing is carried out under vacuum conditions to wood materials；The hot pressing temperature takes 100 DEG C -220 DEG C, and the moulding pressure takes
1-4MPa after reaching hot pressing time, goes vacuum, carries out release, cooling.
2. a kind of method of wood materials vacuum compression densification according to claim 1, it further includes to wood that feature, which exists,
Material is dried and sanding surface processing；To the processing of dry and sanding surface, treated that wood materials are cut；Institute
Stating wood materials is timber, and the drying control moisture content is 10 ± 2%, and the hot pressing temperature is 160 DEG C -220 DEG C, the pressure
Contracting processing is vertical timber tangential compression, after reaching hot pressing time, goes vacuum, carries out release, cooling, compressed wood is made.
3. a kind of method of wood materials vacuum compression densification according to claim 2, which is characterized in that before compression
It first vacuumizing, that is, entire compression compact process is allowed to carry out under vacuum conditions, vacuum degree is -0.1MPa~-0.09MPa, heat
The pressure time takes 15min-45min, and hot pressing pressure takes 2-4MPa.
4. a kind of method of wood materials vacuum compression densification according to claim 2, which is characterized in that dry and table
Lumber thickness after facing sand light processing is 18-22mm.
5. wood materials vacuum compression process densification method according to claim 1, which comprises the following steps:
(1) by timber rotary-cut or slicing at Wooden veneer；
(2) to treated in step (1), Wooden veneer is dried；
(3) to treated in step (2), Wooden veneer carries out covering with paint adhesive；
(4) to treated in step (3), Wooden veneer carries out assembly；
(5) to treated in step (4), slab carries out vacuum hotpressing, and vacuum degree is -0.1MPa~-0.09MPa, hot pressing temperature
100 DEG C -120 DEG C are taken, hot pressing time takes 50-90s/mm, and hot pressing pressure takes 1-2MPa；
(6) to treated in step (5) slab, after reaching hot pressing time, vacuum is gone, at release, cooling, cutting edge and sanding
Reason, is finally made the glued board of high bonding strength；Wooden veneer whole moisture content after being dried is 8 ± 3% in step (2)；
The adhesive is urea-formaldehyde resin adhesive at the step (3), and two-sided resin added is 200-300g/m2；In step (4)
The slab is vertical, and-cross-indulges three layers or odd-level assemble pattern.
6. wood materials vacuum compression process densification method according to claim 1, which comprises the steps of:
1) slicing and drying: the good veneer of slicing is dried in drying box with a thickness of the Wooden veneer of 1.6-1.8mm；
2) Wooden veneer after drying gluing: is subjected to covering with paint adhesive；
3) assembly: according to the assemble pattern assembly of laminated veneer lumber；
4) vacuum hotpressing: after slab is put into press, closing vacuum (-tight) housing, vacuumize, hot pressing；
5) release: after reaching hot pressing time, going vacuum, and hot pressing terminates, and slab is taken out in release, at then cooling, cutting edge and sanding
Structural veneer laminated timber is made in reason.
7. wood materials vacuum compression process densification method according to claim 6, which is characterized in that wooden in the step 1
Material is veneer, and is the board using poplar board of no crack degree, and moisture content is 10% after drying；Adhesive is phenol in the step 2
Urea formaldehyde, solid content 65%, two-sided resin added are 300g/m2；Hot pressing temperature is 145 DEG C in affiliated step 3, and slab pressure is
1.0MPa, hot pressing time 60s/mm.
8. wood materials vacuum compression process densification method according to claim 1, which comprises the steps of:
1) saw lumber: sawing the sawn timber made, moisture content 12%, and the wood materials are sawn timber；
2) covering with paint adhesive gluing: is carried out to the sawn timber after drying；
3) assembly: according to the assemble pattern assembly of integrated timber；
4) vacuum hotpressing: after slab is put into press, closing vacuum (-tight) housing, vacuumize, hot pressing；
5) release: after reaching hot pressing time, going vacuum, and hot pressing terminates, and slab is taken out in release, at then cooling, cutting edge and sanding
Structural glulam is made in reason.
9. wood materials vacuum compression process densification method according to claim 8, which is characterized in that wooden in the step 1
Material is pinus sylvestris var. mongolica sawn timber, and adhesive is resorcinol-phenol-formaldehyde copolymer resins in the step 2, solid content 50%,
Two-sided resin added is 260g/m2；Hot pressing temperature is 145 DEG C in the step 4, and slab unit pressure is 1.0MPa, hot pressing time
For 60s/mm.
10. wood materials vacuum compression process densification method according to claim 1, which comprises the steps of:
Wood materials are particieboard in the step 1, and for preparation step with conventional particieboard preparation method, adhesive is phenolic resin
Glue after slab is put into press, closes vacuum (-tight) housing, vacuumizes, and hot pressing temperature is 145 DEG C, and slab unit pressure is 1.0MPa, heat
The pressure time is 60s/mm, and hot pressing terminates, and particieboard is made.
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Cited By (3)
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| CN112659304A (en) * | 2021-01-29 | 2021-04-16 | 云南省烟草公司文山州公司 | Preparation method of composite board taking flue-cured tobacco straw as raw material and board |
| CN114227831A (en) * | 2021-11-30 | 2022-03-25 | 苏州昆仑绿建木结构科技股份有限公司 | Manufacturing technology of high-strength laminated wood |
| US11498240B2 (en) | 2017-12-29 | 2022-11-15 | Ahf, Llc | Densified wood including process for preparation |
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| CN109591122B (en) * | 2017-12-29 | 2021-09-03 | 南京林业大学 | Method for vacuum compression and densification of wood material |
| CN109434975A (en) * | 2018-12-18 | 2019-03-08 | 南京工业大学 | Comprehensive fast growing wood material feature and the orthogonal laminated wood of building structure demand and preparation method thereof |
| CN110472719A (en) * | 2019-08-01 | 2019-11-19 | 珠海全球时代科技有限公司 | The production method of wooden electronic label card |
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Also Published As
| Publication number | Publication date |
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| CN108177209B (en) | 2019-03-29 |
| CN109591122B (en) | 2021-09-03 |
| CN108177209A (en) | 2018-06-19 |
| WO2019128197A1 (en) | 2019-07-04 |
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