CN102873730B - A kind of preprocess method shortening the drying of wood time - Google Patents
A kind of preprocess method shortening the drying of wood time Download PDFInfo
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Abstract
Shorten the preprocess method of drying of wood time, the method comprises the steps: 1, chooses the timber board of process to be dried; 2, adjust equipment: many groups roll squeezer that equipment is a group or is arranged in order, often organize the Distance geometry barrel velocity on roll squeezer between lower compression roller by setting technical arrangement plan, make pressure roller have the decrement of setting to timber board; 3, timber board pretreatment: start roll squeezer, be flat on by timber board between upper and lower two pressure rollers, relies on frictional force or the External Force Acting of roller surface, makes sheet material arrive output by the input of roll squeezer through one group of roll-in or many group continuous rollings; Roll-in number of times is once or repeated multiple times; 4, the timber board after roll-in carries out drying process.The present invention is used for the pretreatment before the drying of wood, and can shorten the time of the drying of wood to the solid wood sheet material containing certain moisture, economize energy, device structure is simple, easy to operate, use safety, can reduce production cost.
Description
Technical field
The present invention relates to a kind of preprocess method shortening the drying of wood time, belong to solid wood processing technique field in timber industry.
Background technology
During arboreal growth, wood internal preserves the moisture of some, needs, by dry run, moisture content is dropped to required scope in timber processing.The drying of wood is the core technology in timber industry, is production link crucial in solid wood goods manufacturing process; Wood drying length consuming time, several days at least, Shi Jitian, tens days at most, consume mass energy, account for the 50%-70% of processing link total energy consumption.Under the prerequisite ensureing dry mass, seem very necessary and urgent for shortening drying time and the research work carried out.
For shortening the running time of the drying of wood, achievement in research both domestic and external concentrates on Microwave Pretreatment and explosion pretreatment two aspects.Use microwave technology to carry out pretreatment to timber before dry, improve timber and ability is dredged to moisture, reach the object shortening drying time, be all the hot issue of research both at home and abroad for a long time, define a lot of achievement in research.Blasting technique is also widely used in the pretreated research of the drying of wood.Theory is thought, after maintenance micro-explosion under timber profile and the impregnable condition of mechanical property, when wood internal exists gases at high pressure, during ambient exterior atmospheric pressure momentary recovery normal pressure, timber is inside and outside forms pressure reduction, and the gases at high pressure of wood internal just form high velocity air, impact from inside to outside.When high velocity air runs into the positions such as the position that precipitated thing blocks, inaccessible pit, hole minimum margo, will dredge, break up, smash bar, thus the permeance property of timber is improved.Described timber Microwave Pretreatment and explosion preprocess method, corresponding effect can be reached, but microwave method for preprocessing needs to consume mass energy, explosion preprocess method needs special pressure-resistant equipment, cause the cost increase of preprocessing process, be difficult to promote in actual production, market waits in expectation, and method is simple, easy to operate, the appearance of the drying of wood preconditioning technique of lower cost.
Summary of the invention
The object of this invention is to provide the preprocess method of a kind of shortening drying of wood time newly, this method can promote amount of flow and the speed of Wood moisture, shorten the time of the drying of wood, and device structure is simple, easy to operate, energy economize energy, reduces the production cost of preprocessing process.
Technical scheme of the present invention is: a kind of preprocess method shortening the drying of wood time, it is characterized in that, the method comprises the steps:
(1) choose timber board: the timber board being chosen at the process to be dried within the scope of design size, the maximum moisture content of sheet material can extremely by water saturation state;
(2) technical parameter is adjusted: many groups roll squeezer that equipment is a group or is arranged in order, often organize roll squeezer to be made up of upper lower compression roller, upper lower compression roller rotation direction is contrary, the Distance geometry pressure roller rotating speed on roll squeezer between lower compression roller is often organized by the technical arrangement plan of setting, setting spacing is less than the thickness of timber board, makes pressure roller have certain decrement to timber board;
(3) timber board pretreatment: start roll squeezer, timber board is flat between upper and lower two pressure rollers, rely on frictional force or the External Force Acting of roller surface, make sheet material arrive output by the input of roll squeezer through one group of roll-in or many group continuous rollings, roll-in number of times is once or repeated multiple times;
(4) dry process: to carrying out drying process through the pretreated timber board of roll-in, drying mode comprises air natural drying, conventional steam drying, microwave drying or dielectric drying.
The achievement in research of modern timber drying theory is thought, the drying of wood is the discharge process of moisture in timber, the prerequisite that moisture is discharged is the movement of moisture, according to the parietal layer structural analysis to timber ultramicroscopic view structural feature and Wood molecules cell membrane, the movement of moisture is mainly realized by the pit on cell membrane, moisture is arrived the lumen of other adjacent with it cells by a lumen by pit with gaseous state and the liquid mode alternated, the final surface arriving timber.
When pit on wood cell wall refers to that wood cell wall thickeies generation secondary wall, not by the part thickened on primary wall, the depression both on secondary wall.In live standing tree, pit is the passage of moisture between flanking cell and nutrient.Pit is generally made up of parts such as pit annulus, pit cavity, pit aperture, pit membrane, pit chamber and canals; Moisture is exactly arrive lumen adjacent with it by pit membrane from a lumen, and visible, pit membrane is the key position of moisture movement; Theoretical according to Wood Ultrastructure, pit membrane is made up of torus and margo around, and margo has many gaps, and size is between 0.1-1 μm, and the molecule being less than this size can be permeated by margo; Moisture can pass through, but flow and flow velocity will be subject to the serious restriction of margo compact texture.
Core content of the present invention implements transverse compression by the pressure roller in special equipment to timber board, make the main portions pit membrane of moisture movement in timber because of External Force Acting, there is micromorphologic breaking, moisture is increased to the increasing number of cells of superficial layer mobile route, pore size by timber deep layer cells, amount of flow and the speed of moisture get a promotion, and the time of the drying of wood obviously shortens.
Timber is a kind of natural polymer composite be made up of empty cavity cell, and most density, between 0.40g/cm3 to 0.75 g/cm3, has viscoelasticity (elasticity and stickiness) feature; The cell overwhelming majority in timber is elongated, hollow, threadiness, and length-width ratio is large, and the arrangement of cell is close to being parallel to trunk height direction.Under normal temperature and pressure conditions, Wood molecules is subject to the mechanical pressure perpendicular to machine direction, wood cell is laterally flattened, lumen diminishes or disappears, for individual cell, on the shape (being similar to circle or ellipse) special based on pit membrane and cell membrane, the ultramicroscopic view structural feature of most thin section position, becomes the region that mechanical strength on cell membrane is minimum; Under certain compression ratio, the side of cell membrane is pressed towards opposite, and shape strain and stress is assembled at pit membrane place, and form stress and concentrate, when External Force Acting is greater than the internal stress between pit membrane microfibril, micro cracking appears in pit membrane; After timber leaves pressure roller, cell returns back to again original shape because of elasticity, but the microphysics deformation that pit membrane place is formed is saved.
In timber except a part of cell wall substance, the lumen that remainder is occupied by moisture (steam), air, inorganic substances and inclusion and space between cells, and the moisture in timber is divided into Free water and hygroscopic water, the timber Roller compression pretreated time is very short, namely complete instantaneously, macroscopically the lateral dimension of timber diminishes, and microcosmic is then that lumen in timber and space between cells are crushed, and the free water and air of a part is wherein extruded timber; Pretreatment completes, and when external force is eliminated, the lumen be crushed and space between cells will be returned to original shape and size (being similar to elastic recovery completely), and negative pressure appears in the space in timber, and extraneous air can take this opportunity again to enter in timber; The outflow of moisture during pretreatment, the outflow of air and inflow, when the drying of wood, objectively shift out timber to Free water and hygroscopic water and serve facilitation.In compression wood process, the pit membrane (main thoroughfare of moisture discrepancy timber) on wood cell wall may be damaged, and the individual sites of cell membrane may occur crack, and the variation of these microtextures all will improve water fluidity in timber significantly.
Above-mentioned explanation of the principles of the present invention, far apart different with other drying of wood preprocess method.
The present invention is to the explanation of the equipment of use: the steel pressure roller being configured with enough mechanical strengths for about a pair, and pressure roller diameter is full-scale, and roll surface is plane, need do the protective treatments such as acid-fast alkali-proof; One is drive roll, and another is driven voller, or is all drive roll, but turns to contrary; Two roller adjustable intervals, roller spacing need be less than plank thickness, causes certain pressure to sheet material, and frictionally or External Force Acting make timber board pass through by between roller.Pressure roller length is greater than plank width, and the large I of roller spacing is determined according to the thickness of pending sheet material and decrement.As required also multipair pressure roller can be set, all at the row of patent protection.
The present invention has following features: 1. roll-in pretreatment time is extremely short, instantaneously completes, and efficiency is high, can be continuously produced; 2. to the moisture content scope non-selectivity of timber to be pre-treated, wide region moisture content condition is applicable to; 3. according to wood cell wall ultramicroscopic view architectural feature and mechanism of moisture migration, mechanical compaction roll is scientifically adopted to carry out transverse compression to timber board, wood cell is instantaneous to be crushed, stress is concentrated, pit membrane on cell wall breaks, timber is greatly improved to the impregnability of moisture and penetrance, and the drying of wood significantly shortens running time; 4. the roll-in pretreatment of the drying of wood can use one group of pressure roller one or many to complete, and also can use many groups pressure roller is disposable to complete, and the compression ratio of roll-in each time can be identical, also can be different; The diameter of pressure roller and rotating speed all can change as required at any time, rolling process easy to adjust, quick; 5. operating environment safety, can carry out at ambient pressure, and save expensive pressure-resistant treatments equipment, energy resource consumption obviously reduces, and cost significantly reduces.6. in operation, roll squeezer can be connected with log Woodmaking by this inventive method, and the sheet material after saw lumber can carry out roll-in pretreatment immediately, no longer needs extra workshop section, very convenient on technology and equipment arranges; 7. the theoretical foundation of this roll-in preprocess method is the pit membrane destroyed on wood cell wall, and the destruction because of pit membrane causes the speed of moisture movement in timber and flow and significantly can improve this fact and be confirmed in research (microwave method, blasting procedure) in the past.
Long for size 2000() × 100(is wide) × 30(is thick) the toothed oak wood plank of mm, moisture content is dried to 8%-10% by about 70%, in conventional steam medium dry kiln, needs 21-22 days; After the roll-in pretreatment of different process, within 18-19 days, end of a period moisture content can be reached, shorten more than 2 days drying time, production can be saved the time of 5%-10%.According to current material, energy prices account cost, dry 1m
3the expenses such as the energy resource consumption of 1 day of toothed oak wood plank, equipment depreciation are about 10 yuan, 100 m
3dry kiln, an arid cycle can save more than 2000 yuan, remarkable in economical benefits.
Present device structure is simple, easy to operate, can shorten the running time of dry link, and energy economize energy, can reduce equipment cost compared with explosion preprocess method compared with microwave method for preprocessing, thus reduces production cost.
Accompanying drawing explanation
Fig. 1 is drying of wood roll-in pretreatment principle schematic.
Detailed description of the invention
The present invention is the pre-treatment method implemented before drying of wood operation, and the technical indicator that the process equipment that the method uses proposes according to inventor and requirement, entrust manufacture.Device structure is simple, and production operation is convenient, safety, directly can carry out preprocessing to the solid wood board of wide region moisture content.
The present invention adopts following steps to complete, (1) timber board is chosen: the sheet material that the material used in the present invention is solid wood, seeds classification is not limit, sheet material appearance and size is chosen within the scope of design size, strip width size need be greater than gauge, and moisture content is more than fibre saturation point to be advisable.(2) technical parameter is adjusted: many groups roll squeezer that equipment is a group or is arranged in order, often organize roll squeezer to be made up of upper lower compression roller, in Fig. 1,1 is top roll, 2 is lower rolls, 3 is timber boards, upper lower compression roller rotation direction is contrary, the Distance geometry pressure roller rotating speed on roll squeezer between lower compression roller is often organized by the technical arrangement plan of setting, technological parameter is the factor such as thickness, the seeds classification setting according to sheet material, setting spacing is less than the thickness of timber board, makes pressure roller have the decrement of design to timber board; (3) timber board pretreatment: start roll squeezer, be flat on by timber board between upper and lower two pressure rollers, relies on frictional force or the External Force Acting of roller surface, makes sheet material arrive output by the input of roll squeezer through one group of roll-in or many group continuous rollings; For same timber board, both can use many group pressure roller continuous rollings, also can use the roll-in of one group of pressure roller one or many; For continuous rolling and repeatedly roll-in, next group roll-in pretreatment, compared with during upper one group of roll-in, the spacing of pressure roller can be identical, also can be different.(4) dry process: to carrying out drying process through the pretreated timber board of roll-in, mode comprises air natural drying, conventional steam drying, microwave drying or dielectric drying form.
It is below the example of the roll-in pretreatment of toothed oak wood plank and the drying of wood
This case expedition is in the different phase of the drying of wood, and the moisture content decrease speed of roll-in pretreatment timber compares with material (without roll-in pretreatment sheet material), illustrates that roll-in pretreatment is to the effect shortening the drying of wood time.
Material: toothed oak wood (Quercus mongolica Fisch.) sheet material, derive from same strain log, wood property is close, zero defect, and moisture content is 60% ~ 80%, is made into quarter-sawed lumber and the plain-sawed lumber of standard, and 900(is long) × 100(is wide) × 30(is thick) mm.
Equipment: roll squeezer, upper lower compression roller is all drive roll, velocity of rotation 30r/min, the long 350mm of roller, pressure roller diameter 500mm.
Roll-in pretreating process: carry out tangential compression to quarter-sawed lumber, carries out radial compression to plain-sawed lumber, and compression ratio is 10%, 20% and 30%, and the compression number of times under different compression ratio is respectively 1,4 and 9 time.
Drying of wood benchmark:
In table: MC-moisture content, T-dry-bulb temperature, Δ t-wet-bulb depression.
The pre-heat treatment: be implemented on before the drying of wood starts, before namely drying schedule starts.
T=65 DEG C, Δ t=0-1 DEG C, time=6h.
Intermediate treatment 1: betided for the 2nd mid-term in stage, when namely the average moisture content of timber is 35%.
T=75 DEG C, Δ t=0-1 DEG C, time=6h.
Intermediate treatment 2: betided for the 3rd later stage in stage, when namely the average moisture content of timber is 25%.
T=75 DEG C, Δ t=2-3 DEG C, time=8h.
End process: betided for the 6th later stage in stage, and namely the average moisture content of timber reaches moisture content when being 8% ~ 10%.
T=80 DEG C, Δ t=7-8 DEG C, time=8h.
Moisture content is determined, adopts moisture content sample board and drying box method jointly to measure.
Way of stacking
The number of plies: 10 layers, every layer of plate quantity: 6 pieces, inspection panel position: the 5th layer, parting bead thickness: 15mm.
After toothed oak wood quarter-sawed lumber is carried out tangential and radial roll-in pretreatment from plain-sawed lumber respectively with different compression ratios and compression number of times, put into wood dryer and carry out drying together with plain plate, choose the moisture content decrease speed of 6 stages to different process process sheet material and measure and study.
The decrease speed of material moisture content is tried under 10% compression ratio
Under table 1 10% compression ratio, roll-in pretreatment material compared with plain plate, the moisture content decrease speed in each stage
In table 1: drying stage 1 is expressed as the decrease speed of moisture content in dry beginning ~ 46h process;
Drying stage 2 is expressed as the decrease speed of moisture content in dry 96h ~ 102h process;
Drying stage 3 is expressed as the decrease speed of moisture content in dry 108h ~ 129h process;
Drying stage 4 is expressed as the decrease speed of moisture content in dry 165h ~ 201h process;
Drying stage 5 is expressed as the decrease speed of moisture content in dry 201h ~ 223h process;
Drying stage 6 is expressed as the decrease speed of moisture content in dry 223h ~ 252h process.
The time of the drying stage in following table is shown identical therewith.
By the analysis of compression direction different under 10% compression ratio in his-and-hers watches 1 with sheet material each drying stage moisture content decrease speed of compression number of times, can find, the decrease speed through the dry moisture content of the pretreated sheet material of tangential or radial roll-in is wanted obviously faster than the plain plate without the pretreated correspondence of roll-in.As at drying stage 1, the moisture content decrease speed 0.038%/h faster than the material of correspondence of the sheet material that tangential roll-in is 1 time, namely from drying to dry 46h, the moisture content of the sheet material of tangential roll-in 1 time decline 0.038% × 46h=1.79% more than corresponding plain plate under 10% compression ratio; The moisture content decrease speed 0.084%/h faster than the plain plate of correspondence of the sheet material that radial roll-in is 1 time, namely from drying to dry 46h, the moisture content decline 0.084% × 46h=3.84% more than the plain plate of correspondence of the sheet material of radial roll-in 1 time under 10% compression ratio.
Can also find, under the compression ratio of 10%, the decrease speed of each drying stage moisture content of sheet material of identical compression direction increases along with the increase of compression number of times.As at drying stage 4, the 0.014%/h faster than the moisture content decrease speed of tangential roll-in 1 time of tangential roll-in 4 times, radial roll-in 4 times want specific diameter to the fast 0.01%/h of roll-in 1 time; In dry 5 stages, the 0.027%/h faster than the moisture content decrease speed of tangential roll-in 1 time of tangential roll-in 9 times, radial roll-in 9 times want specific diameter to the fast 0.028%/h of roll-in 1 time.
Under the condition that 10% compression ratio roll-in number of times is identical, the sheet material moisture content decrease speed of radial compression is faster than the sheet material of tangential compression, and the material of its correspondence also has identical feature.As at drying stage 3, the moisture content decrease speed 0.023%/h faster than quarter-sawed lumber material of plain-sawed lumber material; At drying stage 1, the moisture content decrease speed that radial roll-in is 1 time is than the fast 0.058%/h of tangential roll-in 1 time; At drying stage 5, the moisture content decrease speed that radial roll-in is 4 times is than the fast 0.012%/h of tangential roll-in 4 times; In dry 3 stages, the moisture content decrease speed that radial roll-in is 9 times is than the fast 0.043%/h of tangential roll-in 9 times.
The decrease speed of material moisture content is tried under 20% compression ratio
Under table 2 20% compression ratio, roll-in pretreatment material compared with plain plate, the moisture content decrease speed in each stage
By the analysis of compression direction different under 20% compression ratio in his-and-hers watches 2 with sheet material each drying stage moisture content decrease speed of compression number of times, find, the moisture content decrease speed through the pretreated sheet material of tangential or radial roll-in is wanted obviously faster than the plain plate without the pretreated correspondence of roll-in.As drying stage 3, the sheet material moisture content decrease speed 0.049%/h faster than the plain plate of correspondence that tangential roll-in is 1 time, the sheet material moisture content decrease speed that radial roll-in is 1 time 0.051%/h faster than the plain plate of correspondence; Drying stage 2, the sheet material moisture content decrease speed 0.025%/h faster than the plain plate of correspondence that tangential roll-in is 4 times, the sheet material moisture content decrease speed that radial roll-in is 4 times 0.043%/h faster than the plain plate of correspondence.
Can also find, under the compression ratio of 20%, the decrease speed of each drying stage moisture content of sheet material of identical compression direction increases along with the increase of compression number of times; As at drying stage 1, the 0.016%/h faster than tangential roll-in 1 moisture content decrease speed that tangential roll-in is 4 times, radial roll-in 4 times want specific diameter to the fast 0.059%/h of roll-in 1 time; At drying stage 3, the 0.01%/h faster than the moisture content decrease speed of tangential roll-in 4 times of tangential roll-in 9 times, radial roll-in 9 times want specific diameter to the fast 0.027%/h of roll-in 4 times.
Under the condition that 20% compression ratio roll-in number of times is identical, the sheet material moisture content decrease speed of radial compression is faster than the sheet material of tangential compression.As at drying stage 1, the moisture content decrease speed that radial roll-in is 1 time is than the fast 0.027%/h of tangential roll-in 1 time; At drying stage 3, the moisture content decrease speed that radial roll-in is 4 times is than the fast 0.027%/h of tangential roll-in 4 times; In the stage 5 of drying, the moisture content decrease speed that radial roll-in is 9 times is than the fast 0.007%/h of tangential roll-in 9 times.
The decrease speed of material moisture content is tried under 30% compression ratio
Under table 3 30% compression ratio, roll-in pretreatment material compared with plain plate, the moisture content decrease speed in each stage
Because in the pre-process of roll-in, toothed oak wood plain-sawed lumber is under 30% compression ratio after roll-in 4 times and 9 times, there is macroscopic failure in toothed oak wood plank surface, therefore do not carry out drying and process and test.
By the analysis of compression direction different under 30% compression ratio in his-and-hers watches 3 with sheet material each drying stage moisture content decrease speed of compression number of times, can find, the decrease speed through tangential or radial roll-in pretreated sheet material moisture content is wanted obviously faster than the plain plate without the pretreated correspondence of roll-in.As drying stage 1, the moisture content decrease speed 0.087%/h faster than the plain plate of correspondence of the sheet material that tangential roll-in is 1 time, the moisture content decrease speed 0.114%/h faster than the plain plate of correspondence of the sheet material that radial roll-in is 1 time; Drying stage 3, the moisture content decrease speed 0.079%/h faster than the plain plate of correspondence of the sheet material that tangential roll-in is 1 time, the moisture content decrease speed 0.058%/h faster than the plain plate of correspondence of the sheet material that radial roll-in is 1 time.
Can also find, under the compression ratio of 30%, the decrease speed of each drying stage moisture content of sheet material of tangential compression increases along with the increase of compression number of times.As at drying stage 1, the 0.011%/h faster than the moisture content decrease speed of roll-in 1 time of tangential roll-in 4 times; At drying stage 2, the fast 0.017%/h than roll-in 4 times of tangential roll-in 9 times; At drying stage 6, the 0.087%/h faster than roll-in 1 moisture content decrease speed that tangential roll-in is 9 times.
Under the condition that 30% compression ratio roll-in number of times is identical, the sheet material moisture content decrease speed of radial compression is faster than the sheet material of tangential compression.As at drying stage 4, the moisture content decrease speed that radial roll-in is 1 time is than the fast 0.023%/h of tangential roll-in 1 time.
Conclusion: in sum, compared with plain plate, in the toothed oak wood plank dry run under different roll-in pretreating process, moisture content decrease speed has following feature: (1) is all fast than the moisture content decrease speed of the plain plate of correspondence through roll-in pretreated toothed oak wood plank its moisture content decrease speed in dry run.Illustrate that timber is after roll-in pretreatment, dredge ability to moisture when really can improve the drying of wood, thus accelerate the rate of drying of timber; (2) in dry run, the speed that the moisture content of the toothed oak wood plank under identical compression ratio declines is with the increasing and accelerate of number of times of roll-in; The speed that under identical compression number of times, the moisture content of toothed oak wood plank declines is accelerated with the increasing of Roller compression rate.Illustrate that the internal structure of timber has difference along with compression ratio and the increase of compression number of times.Compression ratio is larger, and compression number of times is more, and in timber, the level of breakage of pit membrane is larger, the number that breaks is more, the crack that cell membrane occurs is also more, thus produces the new way of more moisture movement, accelerates the moisture translational speed of timber in dry run; (3) because toothed oak wood has wide wood radiaftive rays, because the moisture this increasing toothed oak wood radial dredges ability, therefore the rate of drying of flat-cut laminin plate will faster than quarter sawing laminin plate; And due to toothed oak wood be broad leaf tree ring porous wood, what carry out plain-sawed lumber is radial compression, compression curve is syllogic, more to the crushing of early wood, and quarter-sawed lumber carries out is tangential compression, the micro-damage of sheet material destroys large not as the radial compression of plain-sawed lumber, and therefore carrying out radial compression to plain-sawed lumber can make wood internal produce more moisture movable passageway, more be conducive to the movement of moisture in dry run, therefore the sheet material moisture content decrease speed of radial compression is faster than the sheet material of tangential compression.
Claims (1)
1. shorten the preprocess method of drying of wood time, it is characterized in that, the method comprises the steps:
(1) choose timber board: the timber board being chosen at the process to be dried within the scope of design size, the maximum moisture content of sheet material can extremely by water saturation state;
(2) technical parameter is adjusted: many groups roll squeezer that equipment is a group or is arranged in order, often organize roll squeezer to be made up of upper lower compression roller, upper lower compression roller rotation direction is contrary, the Distance geometry pressure roller rotating speed on roll squeezer between lower compression roller is often organized by the technical arrangement plan of setting, setting spacing is less than the thickness of timber board, make pressure roller have certain decrement to timber board, setting roll squeezer velocity of rotation is 30 revs/min;
(3) timber board pretreatment: start roll squeezer, timber board is flat between upper and lower two pressure rollers, rely on frictional force or the External Force Acting of roller surface, make sheet material arrive output by the input of roll squeezer through one group of roll-in or many group continuous rollings, roll-in number of times is once or repeated multiple times;
(4) dry process: to carrying out drying process through the pretreated timber board of roll-in, mode comprises air natural drying, conventional steam drying, microwave drying or dielectric drying.
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| CN104101178A (en) * | 2013-04-09 | 2014-10-15 | 中国林业科学研究院木材工业研究所 | Wood drying pretreatment method and wood drying method |
| CN104422248B (en) * | 2013-08-27 | 2016-08-24 | 北京林业大学 | The processing means improving wood drying rate and the method utilizing this device desiccated wood |
| CN108927875A (en) * | 2017-05-27 | 2018-12-04 | 湖南栋梁木业有限公司 | A kind of fast growing wood imitates the production technology of rare wood |
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| SU1493476A1 (en) * | 1987-10-05 | 1989-07-15 | Украинское научно-производственное деревообрабатывающее объединение | Device for hot rolling of wooden articles |
| CN101368787A (en) * | 2008-06-25 | 2009-02-18 | 冯士祥 | Sheet material drying apparatus and method |
| CN201493925U (en) * | 2009-09-15 | 2010-06-02 | 邵天敏 | Roller |
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| KR20040018814A (en) * | 2002-08-27 | 2004-03-04 | 장경호 | Wood pattern board and manufacturing method therefor |
| FI20041278A (en) * | 2003-11-21 | 2005-05-22 | Teknocomp Oy | Process and plant for the treatment of wood or wood products |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1493476A1 (en) * | 1987-10-05 | 1989-07-15 | Украинское научно-производственное деревообрабатывающее объединение | Device for hot rolling of wooden articles |
| CN101368787A (en) * | 2008-06-25 | 2009-02-18 | 冯士祥 | Sheet material drying apparatus and method |
| CN201493925U (en) * | 2009-09-15 | 2010-06-02 | 邵天敏 | Roller |
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