CN102825645B - Poplar sawn timber and manufacturing method thereof - Google Patents
Poplar sawn timber and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses poplar sawn timber and a manufacturing method thereof. The poplar sawn timber is manufactured by processing the poplar as a main raw material, wherein the density is 0.6-1.5g/cm<3>, and the anti-bending elasticity modulus is greater than 25,000MPa. The manufacturing method comprises the following steps of: performing rotary cutting on the poplar log into a veneer; performing primary drying and dyeing on the veneer; then performing secondary drying on the dyed veneer, and cutting to obtain veneer strips; performing microwave heating, impregnation, third drying and assembly on the veneer strips; and finally performing cold-pressing sizing, heating and curing, microwave balance and after-treatment on the slab after the assembly to obtain the poplar sawn timber. The poplar sawn timber disclosed by the invention has the advantages of high density, high strength, good decoration effect and the like; the manufacturing method is simple to operate, and requires low equipment investment; and the raw materials are widely available, and the cost is low.
Description
Technical field
The present invention relates to a kind of novel timber and machining manufacture thereof, particularly relate to a kind of with poplar be main material novel timber and manufacture method thereof.
Background technology
Willow is one of large quick-growing plantation seeds of China topmost three, and its fast growth, distribution area are wide, timber reserves is large.At present, China's Poplar Plantation area has reached 8,000,000 hectares, exceedes the summation of other national Poplar Plantation area of the world.But fast growth poplar timber (abbreviation poplar) also exists that material is soft, intensity and the defect such as density is low, yielding, apt to rot, color is greyish white, decorative effect is poor, it can only be used as material inferior, and added value of product is low.At present, the Plantation Poplar timber of China mainly for the manufacture of glued board, core-board, medium density fibre board (MDF), particieboard etc., and is almost blank in the application of the value segments such as solid wood.Therefore; use new technological means; modification and composite molding process are carried out to poplar wood; produce the Poplar sawn timber with high density, high strength and good decorative effect; to expansion poplar wood application to meet the growing material requisite of people, to saving precious timber resource, to preserve the ecological environment etc. all significant.
Summary of the invention
The technical problem to be solved in the present invention overcomes the deficiencies in the prior art, there is provided a kind of Poplar sawn timber with high density, high strength and good decorative effect, also the corresponding manufacture method that a kind of simple to operate, equipment investment is little, raw material sources are extensive, cost is low this Poplar sawn timber is provided.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is a kind of Poplar sawn timber, and it is that primary raw material is made after processing process with poplar, and the density of described Poplar sawn timber is 0.6g/cm
3~ 1.5g/cm
3, Deflection Modulus of Elasticity is greater than 25000MPa.
Above-mentioned Poplar sawn timber, preferably, described Poplar sawn timber is the coloured Poplar sawn timber of tool after fixation.
As a total technical conceive, the present invention also provides a kind of manufacture method of above-mentioned Poplar sawn timber, comprise the following steps: be veneer by willow rounding, primary drying and dyeing process are carried out to veneer, then the colored single palte after dyeing process is carried out to redrying, shears to obtain veneer strip, heating using microwave, dipping, three dryings and assembly process are carried out to veneer strip, finally to the slab after assembly process cold pressing sizing, be heating and curing, microwave equilibration and post processing, obtained Poplar sawn timber.
In above-mentioned manufacture method, preferred size Control parameter is as follows: the length of described willow log preferably controls as 0.5m ~ 3.0m, the equipment adopted during rotary-cut is flat-cut machine and plate shearing machine, the thickness controlling veneer after described rotary-cut is preferably 0.5mm ~ 3.0mm, and veneer width is preferably 0.5m ~ 1.0m; Described shearing refers to and adopts veneer clipper along longitudinal parallel-to-grain shear of colored single palte, and the veneer strip after shearing is width at the fillet of 10mm ~ 50mm or the width wide bar at 100mm ~ 300mm; The width of plate slab that described veneer strip obtains after assembly process, sizing of colding pressing is preferably 100mm ~ 300mm, and slab thickness is preferably 100mm ~ 500mm, and slab density is preferably 0.60g/cm
3~ 1.5g/cm
3.
In above-mentioned manufacture method, preferred dry run controling parameters is as follows: described primary drying, three dry drying means adopted are conventional kiln drying (kd) method, net belt type seasoning or method for microwave drying, and the drying means that described redrying adopts is net belt type seasoning or method for microwave drying; In described primary drying process, the surface temperature controlling drying medium or dried veneer is no more than 120 DEG C, in described redrying process, the surface temperature controlling drying medium or dried colored single palte is no more than 90 DEG C, in described three dry runs, the surface temperature controlling drying medium or dried veneer strip is no more than 65 DEG C; Described primary drying, redrying, three dryings all make the moisture content of dry object remain on 8% ~ 15%.
In above-mentioned manufacture method, described dyeing process can adopt microwave radiation technology decoration method, normal temperature and pressure infusion method or high pressure dyeing method, and dyeing process preferably adopts acidity or the reactive dye of two or more different colours.
In above-mentioned manufacture method, the optimizing technology parameters of described heating using microwave-dipping process is as follows: microwave irradiation power density domination is at 0.2 w/cm
3~ 10w/cm
3, microwave heating temperature controls at 50 DEG C ~ 70 DEG C, and radiated time continues 30s ~ 80s; Veneer strip after heating using microwave enters into rapidly described impregnation steps, the resin system that described dipping is used be preferably solids content 20% ~ 50% phenolic resin glue or melamine resin adehsive solution, and flood 1min ~ 20min at normal temperatures and pressures.
In above-mentioned manufacture method, described being heating and curing preferably refers to that the slab after by sizing of colding pressing together is sent into chain tunnel type together with mould and to be heating and curing equipment, the temperature be heating and curing in equipment controls at 120 DEG C ~ 160 DEG C, and the solidification processing time is 8h ~ 16h, naturally cools.
In above-mentioned manufacture method, described microwave equilibration preferably refers to and adopts tunnel type micro wave pretreatment unit to heat-treat the plate side after being heating and curing, heat treatment time is 5min ~ 15min, and in microwave equilibration process, the temperature on surface, plate side controls at 60 DEG C ~ 80 DEG C.
In above-mentioned manufacture method, described post processing generally comprises that Mi Dui deposits, cutting edge and subdivision operation, and the close heap resting period is 10 ~ 30 days, and the thickness of the Poplar sawn timber after subdivision is 10mm ~ 30mm.
Compared with prior art, the invention has the advantages that: instant invention overcomes soft, the intensity of material that existing poplar exists and density defect low, yielding, apt to rot, the novel Poplar sawn timber that the present invention produces has the features such as density is high, intensity large, good decorating effect, the making processing of solid wood furniture, floor and interior/exterior decoration material can be widely used in, greatly expand poplar solid wood processed and applied field, improve the added value of poplar goods.Due to the range of application expanding poplar, and poplar belongs to conventional fast growing wood, and this is the corresponding consumption having saved other precious timbers also, is conducive to reducing timber consumer cost, economizing on resources and ecological environmental protection.In addition, the manufacture method of Poplar sawn timber of the present invention has the advantages such as simple to operate, equipment investment is little, raw material sources are extensive, cost is low, is conducive to industrialization promotion and the application of Poplar sawn timber of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described, but protection domain not thereby limiting the invention.
embodiment 1:
A kind of Poplar sawn timber of the present invention, it is that primary raw material is made after processing process with poplar, and the density of this Poplar sawn timber is 0.8g/cm
3, Deflection Modulus of Elasticity is 33800MPa.This Poplar sawn timber is the colored Poplar sawn timber with three kinds of colors after fixation.
The manufacture method of the present embodiment Poplar sawn timber comprises the following steps:
(1) adopt flat-cut machine and plate shearing machine to be 1.5 m(0.5m ~ 3.0m by length) willow log to be processed into thickness be 1.0 mm(0.5mm ~ 3.0mm), width is 0.8m(0.5m ~ 1.0m) flat-cut veneer (veneer length equals willow log length);
(2) adopt mesh-belt drier (conventional kiln drying (kd), method for microwave drying) to be 10%, in dry run by the flat-cut veneer drying obtained to moisture content, drying medium (or veneer surface) temperature controls at 90 DEG C;
(3) veneer after step (2) is carried out respectively in the reactive dye dye liquor of black walnut look, light green, light yellow three kinds of colors dyeing process; The present embodiment adopts microwave radiation technology decoration method, and before dyeing process, utilize microwave heating equipment to heat veneer, in microwave heating process, microwave irradiation power controls at 4 w/cm
3, temperature of single plate controls at 105 ± 2 DEG C, and keeps 10s, is immersed in rapidly respectively by the veneer after heating using microwave in above three kinds of reactive dye solution and carries out dyeing process, soak 60min, make veneer at the even imbue of thickness direction;
(4) adopting mesh-belt drier that the colored single palte after step (3) is dried to moisture content is 12%, and veneer surface temperature control time dry is at 80 ± 2 DEG C;
(5) adopt veneer clipper along longitudinal parallel-to-grain shear of step (4) poststaining veneer, veneer is cut into the veneer strip (fillet) that width is 20mm;
(6) utilize microwave heating equipment to heat the colored single palte bar after step (5), in microwave heating process, microwave irradiation power controls at 3w/cm
3, during radiation, temperature controls at 65 ± 2 DEG C, and radiated time continues 40s;
(7) the colored single palte bar after step (6) heating using microwave being immersed in rapidly solids content is in the phenolic resins sol solution of 25%, floods 10min at normal temperatures and pressures;
(8) adopt mesh-belt drier to carry out drying process to the board using poplar board bar after step (7) impregnation, its moisture content is dried to 12%; In dry run, the temperature of drying medium (or veneer strip surface) controls at 60 DEG C;
(9) veneer strip of step (8) dried dye three kinds of different colours is amounted to each 24kg of veneer strip that 72kg(often plants color) put into mould with locking device in the same direction, with cold stamping die press to its sizing of colding pressing, slab target density controls at 0.8g/cm
3, after being compressed to setting target density, with steel plate and pin locking die, prevent slab from rebounding and reply.During veneer strip assembly, the veneer strip of different colours as far as possible evenly mixes, and after being compressed to target density, the length of slab equals the length of veneer strip, and width of plate slab is 200 mm, and slab thickness is 300 mm;
(10) the poplar slab after step (9) is together sent into chain tunnel type together with mould to be heating and curing equipment, the temperature be heating and curing in equipment controls at 140 DEG C, and the solidification processing time is 12h;
(11), after being heating and curing, poplar slab being placed in indoor together with mould and displaying, after slab cools completely, adopt form removal machine by mould be heating and curing after restructuring poplar side be separated;
(12) restructuring poplar side is placed in tunnel type micro wave pretreatment unit, microwave is adopted to heat plate side, processing time is 8min, in heating process, the temperature on surface, plate side controls at 65 DEG C ± 2 DEG C, reduce the heat in plate side, wet stress, and reduce the free formaldehyde release in plate side's later stage;
(13) deposited by plate Fang Mi heap, the resting period controls at 20 days;
(14) to the cutting edge in length and breadth of plate side;
(15) adopt sawing machine or multiple blade saw along plate side's thickness sawing (i.e. saw blade or saw blade place plane parallel with the plane that plate side's length and width are formed), thickness is become to be the colored Poplar sawn timber of 18mm plate side's saw solution, length equals plate side's length, and width equals plate side's width.
The new type colorful Poplar sawn timber specification that the present embodiment produces is, and: 1500mm(is long) × 200mm(is wide) × 18 mm(are thick), and there are three look decorative effects.
embodiment 2:
A kind of Poplar sawn timber of the present invention, it is that primary raw material is made after processing process with poplar, and the density of this Poplar sawn timber is 0.9g/cm
3, Deflection Modulus of Elasticity is 44700MPa.This Poplar sawn timber is the colored Poplar sawn timber with four kinds of colors after fixation.
The manufacture method of the present embodiment Poplar sawn timber comprises the following steps:
(1) flat-cut machine and plate shearing machine is adopted to be that the willow log of 1.92 m is processed into the flat-cut veneer (veneer length equals willow log length 1.92m) that thickness is 2.5mm, width is 0.8 m by length;
(2) adopt conventional kiln drying (kd) method to be 12%, in dry run by flat-cut veneer drying to moisture content, drying medium temperature is 80 DEG C;
(3) step (2) dried board using poplar board is carried out respectively in the acid dyes dye liquor of pale red, pale purple, blackish green, pale yellow four kinds of colors dyeing process; The present embodiment adopts high-pressure dyeing, and single-plate dyeing carries out in high pressure vessel, and the pressure in container is 0.5MPa, and the dyeing dwell time is 10min, makes veneer at the even imbue of thickness direction;
(4) adopting tunnel type microwave drying machine colored single palte to be dried to moisture content is 10%, in dry run, and the temperature on veneer surface controls within 90 DEG C;
(5) adopt veneer clipper along longitudinal parallel-to-grain shear of step (4) poststaining veneer, veneer being cut into width is 200mm veneer strip (wide bar);
(6) utilize microwave heating equipment to heat the colored single palte bar after step (5), in microwave heating process, microwave irradiation power controls at 2 w/cm
3, during radiation, temperature controls at 55 ± 2 DEG C, and radiated time continues 50s;
(7) the colored single palte bar after step (6) heating using microwave being immersed in rapidly solids content is in the melamine resin adehsive solution of 20%, floods 15 min at normal temperatures and pressures;
(8) adopt conventional kiln drying (kd) method to carry out drying process to the board using poplar board bar after step (7) impregnation, its moisture content is dried to 10%; In dry run, the temperature of drying medium controls at 55 DEG C;
(9) veneer strip of step (8) dried dye four kinds of different colours is amounted to each 25.75kg of veneer strip that 103kg(often plants color) put into mould with locking device in the same direction, with cold stamping die press to its sizing of colding pressing, slab target density controls at 0.9 g/cm
3, after being compressed to setting target density, with steel plate and pin locking die, prevent slab from rebounding and reply.During assembly, the veneer strip of different colours stacks successively along short transverse, and after being compressed to target density, the length of slab equals the length of veneer strip, and width of plate slab is 200mm, and slab thickness controls at 300mm;
(10) the poplar slab after step (9) is together sent into chain tunnel type together with mould to be heating and curing equipment, the temperature be heating and curing in equipment controls at 150 DEG C, and the solidification processing time is 9h;
(11), after being heating and curing, poplar slab being placed in indoor together with mould and displaying, after slab cools completely, adopt form removal machine by mould be heating and curing after restructuring poplar plate side be separated;
(12) restructuring poplar plate side is placed in tunnel type micro wave pretreatment unit, microwave is adopted to heat plate side, processing time is 10min, in heating process, the temperature on surface, plate side is between 70 DEG C ± 2 DEG C, reduce the heat in plate side, wet stress, and reduce the free formaldehyde release in plate side's later stage;
(13) deposited by plate Fang Mi heap, the resting period controls at 15 days;
(14) to the cutting edge in length and breadth of plate side;
(15) adopt sawing machine or multiple blade saw along plate side's width sawing (i.e. saw blade or saw blade place plane parallel with the plane that plate side's length and thickness direction are formed), thickness is become to be the colored Poplar sawn timber of 20mm plate side's saw solution, length equals plate side's length, and width equals the thickness of plate side.
The new type colorful Poplar sawn timber specification that the present embodiment produces is, and: 1920mm(is long) × 300mm(is wide) × 20 mm(are thick), and there are four look decorative effects.
The colored Poplar sawn timber adopting above embodiment to produce can be widely used in the processing and manufacturing of solid wood furniture, floor and interior/exterior decoration material, drastically increases the added value of poplar goods.
Those skilled in the art should understand; the present invention is not restricted to the described embodiments; the description of above-described embodiment is just in order to illustrate technical scheme of the present invention better; various equivalent variations under the prerequisite not departing from the present invention's spirit and protection domain, all should fall in the protection domain of the claims in the present invention.
Claims (6)
1. the manufacture method of a Poplar sawn timber, comprise the following steps: be veneer by willow rounding, primary drying and dyeing process are carried out to veneer, then the colored single palte after dyeing process is carried out to redrying, shears to obtain veneer strip, heating using microwave, dipping, three dryings and assembly process are carried out to veneer strip, finally to the slab after assembly process cold pressing sizing, be heating and curing, microwave equilibration and post processing, obtained Poplar sawn timber;
Described primary drying, three dry drying means adopted are conventional kiln drying (kd) method, net belt type seasoning or method for microwave drying, and the drying means that described redrying adopts is net belt type seasoning or method for microwave drying; In described primary drying process, the surface temperature controlling drying medium or dried veneer is no more than 120 DEG C, in described redrying process, the surface temperature controlling drying medium or dried colored single palte is no more than 90 DEG C, in described three dry runs, the surface temperature controlling drying medium or dried veneer strip is no more than 65 DEG C; Described primary drying, redrying, three dryings all make the moisture content of dry object remain on 8% ~ 15%;
Described dyeing process adopts microwave radiation technology decoration method, normal temperature and pressure infusion method or high pressure dyeing method, and dyeing process adopts acidity or the reactive dye of two or more different colours;
In described microwave heating process, microwave irradiation power density domination is at 0.2w/cm
3~ 10w/cm
3, microwave heating temperature controls at 50 DEG C ~ 70 DEG C, and radiated time continues 30s ~ 80s; Veneer strip after heating using microwave enters into rapidly described impregnation steps;
The density of described Poplar sawn timber is 0.6g/cm
3~ 1.5g/cm
3, Deflection Modulus of Elasticity is greater than 25000MPa; Described Poplar sawn timber is the coloured Poplar sawn timber of tool after fixation.
2. manufacture method according to claim 1, it is characterized in that: the cut to lengthen of described willow log is 0.5m ~ 3.0m, the equipment adopted during rotary-cut is flat-cut machine and plate shearing machine, and the thickness controlling veneer after described rotary-cut is 0.5mm ~ 3.0mm, and veneer width is 0.5m ~ 1.0m; Described shearing refers to and adopts veneer clipper along longitudinal parallel-to-grain shear of colored single palte, and the veneer strip after shearing is width at the fillet of 10mm ~ 50mm or the width wide bar at 100mm ~ 300mm; The width of plate slab that described veneer strip obtains after assembly process, sizing of colding pressing is 100mm ~ 300mm, and slab thickness is 100mm ~ 500mm, and slab density is 0.6g/cm
3~ 1.5g/cm
3.
3. manufacture method according to claim 1, is characterized in that: the resin system that described dipping is used be solids content 20% ~ 50% phenolic resin glue or melamine resin adehsive solution, and flood 1min ~ 20min at normal temperatures and pressures.
4. manufacture method according to claim 1, it is characterized in that: described in be heating and curing and refer to that the slab after by sizing of colding pressing together is sent into chain tunnel type together with mould and to be heating and curing equipment, the temperature be heating and curing in equipment controls at 120 DEG C ~ 160 DEG C, the solidification processing time is 8h ~ 16h, naturally cools.
5. manufacture method according to claim 1, it is characterized in that: described microwave equilibration mainly refers to and adopts tunnel type micro wave pretreatment unit to heat-treat the plate side after being heating and curing, heat treatment time is 5min ~ 15min, and in microwave equilibration process, the temperature on surface, plate side controls at 60 DEG C ~ 80 DEG C.
6. manufacture method according to claim 1, is characterized in that: described post processing comprises that Mi Dui deposits, cutting edge and subdivision operation, and the close heap resting period is 10 ~ 30 days, and the thickness of the Poplar sawn timber after subdivision is 10mm ~ 30mm.
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| CN103128818B (en) * | 2013-03-04 | 2015-12-30 | 中南林业科技大学 | A kind of gradient color poplar weightening finish sawn timber and manufacture method thereof and gradual change annealing device |
| CN107127839A (en) * | 2017-05-27 | 2017-09-05 | 福建农林大学 | A kind of preparation method of bamboo fibre laminated timber |
| CN116604655B (en) * | 2023-04-25 | 2024-01-30 | 江苏零界科技集团有限公司 | High-strength log veneer and preparation method thereof |
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Application publication date: 20121219 Assignee: Hunan Zhongji New Material Technology Co.,Ltd. Assignor: CENTRAL SOUTH University OF FORESTRY AND TECHNOLOGY Contract record no.: X2020980005272 Denomination of invention: Poplar sawn timber and its manufacturing method Granted publication date: 20141231 License type: Exclusive License Record date: 20200821 |