CN104760112A - Method for preparing medium/high-density fiber board by sunflower stems - Google Patents
Method for preparing medium/high-density fiber board by sunflower stems Download PDFInfo
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- CN104760112A CN104760112A CN201510048394.2A CN201510048394A CN104760112A CN 104760112 A CN104760112 A CN 104760112A CN 201510048394 A CN201510048394 A CN 201510048394A CN 104760112 A CN104760112 A CN 104760112A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
- B27N3/12—Moulding of mats from fibres
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention discloses a method for preparing a medium/high-density fiber board by sunflower stems, and belongs to the field of manmade boards. The method comprises the following steps: naturally drying the sunflower stems, cutting, performing air selecting, screening, performing water washing, storing, softening, thermally grinding, applying glue, applying wax, drying, paving, pre-pressing, thermally pressing, cooling, longitudinally and transversely sawing, and polishing, thereby obtaining the medium/high-density fiber board. The fiber board can increase a wood substitute and can relive a tense wood supply problem of China. According to the detection, the method adopts the dry sunflower stems with moisture content of about 10% as raw materials, so that the water can be naturally removed by more than 90%; the prepared fiber board meets the requirements of the furniture type medium/high-density fiber board used in a dry state specified in national standard GB/T11718-2009, so that the waste is changed into things of value, and the economic income of a farmer is increased.
Description
Technical field
The present invention relates to a kind of method utilizing Sunflower Pole to prepare medium/high density fiber board, belong to wood-based plate field.
Background technology
Sunflower is the crops of a kind of acid and alkali-resistance, happiness light, drought resisting.Very harsh to growth conditions, require north latitude more than 40 degree, the suitable condition that the sunshine-duration is long, rainfall is few just can be eugenic.The some areas in China Inner Mongolia Autonomous Region, Xinjiang and northeast are applicable to sunflower planting conditions.The every Annual planting area in the Hetao area in the Inner Mongol can reach more than 300 ten thousand mu, and the Hetao area plants the history of sunflower for many years, defines pure green, free of contamination planting base.And the sunflower oil unrighted acid to produce due to the specific condition such as the temperature difference, soil, weather, illumination, linoleic acid content are high, vitamin E and multiple nutritional components high, oil content is high, stay in grade.Sunflower oil bright color, pure taste, unsaturated fatty acid content is up to 90%, and linoleic acid content is more than 17%, and the high nutrition containing multiple needed by human such as vitamin E, Cobastab, folic acid, iron, potassium, zinc.Sunflower oil is the grease of nutrition and health care, is also one of oil kind of edible oil first-selection.But up to the present, sunflower is only make use of sunflower seeds, and the Sunflower Pole accounting for sunflower ratio maximum does not utilize.Sunflower Pole burns except material except the part as peasant, then does not have other purposes.The a large amount of Sunflower Poles given birth to every year to be deposited in before the room of peasant behind the house, abandon and grow on trees in field.Deposit for a long time and Sunflower Pole is rotted, not only make the good wasting of resources, be also the hidden danger of fire simultaneously, cause environmental pollution.Make full use of these good source extremely urgent, local government leaders of the Party and the government have been fully recognized that the importance developing these resources.Develop and not only turn waste into wealth, the income of peasant can be increased again simultaneously, improve the living standard of peasant.The pollution of disaster hidden-trouble and environment can be eliminated again, increase the substitute for wood of some can to again country simultaneously, the nervous situation alleviating China's timber resources is had great significance.
Sunflower Pole is primarily of outer skin zone, xylem, heart composition.Outer skin zone is very thin, rough surface hairiness, and micro-have undercoat to sting, and have joint and internode, the weight that outer skin zone accounts for Sunflower Pole is very little.The character of Sunflower Pole determines primarily of xylem.The density of xylem is 0.352 gram/cm
3left and right, compared with timber, Sunflower Pole xylem is coarse loose, longitudinally easy to crack.Heart is made up of spongy material, and medulla is very soft, and medulla space between cells is full of air, presents white, and medulla spongy material is made up of parenchyma cell, and its intensity is very low, does not have benefit to the raising of fiberboard intensity.
As follows to a strain representational Sunflower Pole measurement result: Sunflower Pole average diameter 29.16mm; Sunflower Pole section average length 49.24mm; Sunflower Pole xylem thickness 3.686mm; When moisture content is 5.86%, the heavy 4.211g of xylem; When moisture content is 5.86%, the heavy 0.581g of heart; The cumulative volume of test specimen is 131.47cm
3; Test specimen medulla volume 73.4cm
3; Test specimen xylem volume 16.6cm
3; Test specimen unit weight 0.036g/cm
3; Test specimen medulla unit weight 0.007g/cm
3; Test specimen xylem unit weight 0.25g/cm
3; It is 87.33% that test specimen medulla volume accounts for total volume percent; It is 12.67% that test specimen xylem volume accounts for total volume percent; It is 89.05% that test specimen xylem weight accounts for total weight percent; It is 10.95% that test specimen medulla weight accounts for total weight percent.
As can be seen from above-mentioned data, medulla volume accounts for cumulative volume 87.33%, and its weight only accounts for 10.95% of gross weight; And xylem volume accounts for cumulative volume 12.67%, its xylem weight accounts for gross weight 89.05%.It can thus be appreciated that xylem determines Sunflower Pole gross weight, xylem determines the character of Sunflower Pole.Medulla is very light, and intensity is very low, does not have benefit, remove medulla in process as far as possible to medium density fibre board (MDF) quality, and medulla can be used as the first-class protein feed of peasant domestic animal.
The fibre morphology table of table 1 xylem
Table 2 Sunflower Pole compares with other raw fibre forms
As can be seen from above two tables, the average fiber length of Sunflower Pole 693 μm, is all greater than desert shrub, Wu Liu, salix monogolica, caragana microphylla, sea-buckthorn.From then on its intensity of fiberboard that known Sunflower Pole is produced is better than the fiberboard of desert shrub.
The cell membrane chamber ratio of Sunflower Pole is less than desert shrub, the fiberboard of this manufacture of materials, and the felt properties between fiber is good, and the intensity of fiberboard is good.
Table 3 Sunflower Pole compares with the chemical composition of other materials
Chemical composition mainly cellulose, hemicellulose and the lignin of Sunflower Pole, also has a small amount of sugar, grease thing, wax, tannin etc.Cellulose and lignin form the main component of fibre strength, and cellulose and the lignin content of Sunflower Pole are low, but the fiber finer of Sunflower Pole and growing, and adds specific area, too increase bonding capacity, overcomes cellulose and the low defect of lignin.
In sum, from fibre morphology and the chemical composition data of Sunflower Pole, Sunflower Pole is the excellent raw material of producd fibers plate.
Sunflower Pole (moisture content accounts for about 8%) 1.1 tons can produce (height) density fiber board in 1 cubic metre.Only China Hetao area often produces Sunflower Pole 800,000 tons more than per year, and these Sunflower Poles can produce medium density fibre board (MDF) 72 ten thousand stere.Each cubic metre of medium density fibre board (MDF) can replace three cubic metres of timber, the Sunflower Pole that only Hetao area is often produced per year all produces medium density fibre board (MDF) can replace 216 ten thousand stere timber, these timber are all larger than the year cutting of the Northwest timber, known, in utilizing Sunflower Pole to produce, (height) density fiber board is significant.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method utilizing Sunflower Pole to prepare medium/high density fiber board, described method adopts the dry Sunflower Pole of moisture content about 10% to make raw material, can naturally except marrow reach more than 90%, the medium/high density fiber board of preparation meets national standard (GB/T11718-2009) and specifies requirement.
Object of the present invention is realized by following technical scheme:
Utilize Sunflower Pole to prepare a method for medium/high density fiber board, described method concrete steps are as follows:
(1) natural drying
Natural air drying process is carried out to Sunflower Pole, obtains the Sunflower Pole that moisture content is 8 ~ 10%;
(2) chip
Dried Sunflower Pole is chipped process, the mixed material that the sunflower sheet that to obtain by medulla and length be 3 ~ 50cm forms;
Described chipping preferably adopts drum chipper; The charging roller of described wood chipping equipment is 2 ~ 3 right, and cutting tool sharpening angle is 23 ° ~ 27 °, and grit hole is 4 ~ 6cm
2.
(3) selection by winnowing, screening
Utilizing wind-force to be separated with medulla by sunflower sheet in mixed material, is that the sunflower sheet of 35 ~ 50cm re-starts process of chipping by length, and length is less than the sunflower sheet removing of 10cm, obtains the sunflower sheet that length is 10 ~ 35cm, is sunflower sheet for subsequent use;
(4) wash, store
Washing process is carried out to sunflower sheet for subsequent use, and by the sunflower sheet for subsequent use after washing at feed bin storage 1 ~ 2h, obtains the sunflower sheet that moisture content is 45 ~ 50%;
Described washing preferably adopts spiral rinsing machine;
(5) softening, defibrator process
Softening and defibrator process process are carried out to the sunflower sheet after step (4) process, obtains fiber;
The described softening boiling cylinder preferably adopting defibrator, wherein, the steam pressure of boiling cylinder is 4.5 ~ 6kg/cm
2, digestion time is 4 ~ 6 minutes; Described defibrator process preferably adopts defibrator, and wherein, the feed auger of defibrator is cone, and feed gap dimension is 30 ~ 40cm, and the axial compressive force of defibrator is 2 ~ 3kg/cm
2;
(6) applying glue, applying wax
In described fiber, add paraffin and sizing material, mix, obtain composite fibre;
Wherein, the addition of sizing material is 11 ± 1% of dry fiber weight; The addition of paraffin is every cubic metre of fiberboard 4 ~ 8 kilograms of solid paraffins; The preferred Lauxite of sizing material;
(7) dry
Drying process is carried out to the composite fibre after applying glue applying wax, obtains the dry fiber that moisture content is 8 ~ 10%;
Described drying preferably adopts drying duct, passes into hot-air and fiber in pipeline, and drying medium is hot-air, and wherein, drying tube entrance hot air temperature is 125 DEG C ± 5 DEG C, and outlet hot air temperature is 85 DEG C ± 5 DEG C, and drying time is 4 seconds;
(8) to mat formation and precompressed
Dried fiber is mated formation, obtains slab band; Precompressed process is carried out to slab band, obtains the slab that thickness is 20 ~ 25cm;
Described preferably employing vacuum pneumatic spreading machine of mating formation; Described precompressed preferably adopts continous way prognosis machine;
(9) hot pressing
Described slab band is carried out sawing process, obtains the slab be of the required size; Hot-pressing processing is carried out to the slab after sawing, obtains burr plate;
Described hot pressing adopts multi-daylight press, and hot pressing temperature is 150 DEG C ~ 180 DEG C, and pressure is 18 ~ 20kg/cm
2, hot pressing time is 8 ~ 10 minutes;
(10) post processing
Successively buck, mitre saw limit and sanding are carried out to burr plate, obtain fiberboard of the present invention.
Beneficial effect
(1) the method for the invention is on the basis of the preparation method utilizing (height) density fiber board in timber, according to the character of Sunflower Pole, improve described preparation technology, the medium/high density fiber board prepared meets the requirement of the medium/high density fiber board of the furniture type used under standard GB/T/T11718-2009 specifies dry state.
(2) the method for the invention can turn waste into wealth, and increases the income of peasant.
Sunflower Pole is agricultural crop straw, often produces per year once.The Sunflower Pole in annual postpartum piles the Around the house abandoned in field and peasant household, and peasant can only by part as burning material, and other are again without what purposes.Long-term stacking, slowly natural drying is easy to cause fire, also result in the pollution of environment.Sometimes fire off in field, but this method is also inadvisable.To set fire burning straw, stain air, discharge a large amount of carbon dioxide, again contaminated environment.Utilize stalk to produce medium/high density fiber board and not only can produce useful substitute for wood, can problem of environmental pollution be solved again, twice laid simultaneously, turn waste into wealth;
In addition, peasant sells Sunflower Pole every year can increase peasant economy income, improves their living standard.In addition, Sunflower Pole is produced medium/high density fiber board and is produced a large amount of sunflower medullas, and described medulla is rich in abundant vegetable protein, and the medulla of Sunflower Pole is the good feed of peasant domestic animal, as the domestic animals such as pig, sheep, ox, chicken all like medulla feed.So Sunflower Pole produces the feed of by-product as domestic animal of medium/high density fiber board, and peasant can obtain a part of economic interests again, increase income.
(3) the medium/high density fiber board that prepared by the method for the invention can increase substitute for wood, slows down the nervous problem of China's wood supply.
Detailed description of the invention
Below in conjunction with specific embodiment in detail the present invention is described in detail, but is not limited thereto.
Embodiment 1
Utilize Sunflower Pole to prepare a method for medium density fibre board (MDF), described method concrete steps are as follows:
(1) natural drying
Natural air drying process is carried out to Sunflower Pole, obtains the Sunflower Pole that moisture content is 8 ~ 10%;
(2) chip
Utilize charging roller be 2 to, cutting tool sharpening angle be 23 °, grit hole is 4cm
2drum chipper dried Sunflower Pole is chipped process, the mixed material that the sunflower sheet that to obtain by medulla and length be 3 ~ 50cm forms;
(3) selection by winnowing, screening
Sunflower Pole is natural longitudinal cracking after chipping, sunflower medulla and xylem natural separation, mixed material after chipping is transported to the end of belt feeder and naturally scatters, utilize wind-force that lighter medulla is blown out, sunflower sheet drops on screen cloth naturally, and the sunflower sheet being 35 ~ 50cm by length by screening re-starts process of chipping, and the sunflower sheet that length is less than 10cm removes, obtain the sunflower sheet that length is 10 ~ 35cm, be sunflower sheet for subsequent use;
(4) wash, store
Owing to being mixed with a large amount of silt and stone in described sunflower sheet for subsequent use, fragile cutter, therefore utilize spiral rinsing machine to carry out washing process to sunflower sheet for subsequent use, and the sunflower sheet for subsequent use after washing is stored 1h at feed bin, the moisture inner layer of sunflower sheet outer surface is moved, to balancing water content, obtain the sunflower sheet that moisture content is 45 ~ 50%;
(5) softening, defibrator process
Add boiling cylinder to the sunflower sheet after step (4) process, the steam pressure regulating boiling cylinder is 4.5kg/cm
2, lower boiling 6 minutes; Utilize defibrator to carry out defibrator process process to the sunflower sheet after boiling, obtain fiber; Wherein, the feed auger of defibrator is cone, and feed gap dimension is 30 ~ 40cm, and the axial compressive force of defibrator is 2 ~ 3kg/cm
2, the gap between two mills requires to regulate at any time along with raw material sofening treatment degree and fiber quality;
(6) applying glue, applying wax
In described fiber, add paraffin, (addition is that every cubic metre of fiberboard adds 6 kilograms of solid paraffins) and Lauxite sizing material (addition is 11% of dry fiber weight), mix, obtain composite fibre;
(7) dry
Drying duct is utilized to add in drying duct to the composite fibre after applying glue, applying wax, take hot-air as drying medium, controlling drying duct entrance hot air temperature is 125 DEG C ± 5 DEG C, outlet hot air temperature is 85 DEG C ± 5 DEG C, drying is carried out to described composite fibre, obtains the dry fiber that moisture content is 8 ~ 10%; Wherein, drying time is 4 seconds;
(8) to mat formation and precompressed
Utilize vacuum pneumatic spreading machine to mat formation to dried fiber, obtain slab band; Utilize continuous prepress to carry out precompressed process to slab band, obtain the slab that thickness is 20cm;
(9) hot pressing
Described slab band is carried out sawing process, obtains the slab be of the required size; Utilize multi-daylight press to carry out hot-pressing processing to the slab after sawing, obtain burr plate; Wherein, hot pressing temperature is 150 DEG C, and pressure is 18kg/cm
2, hot pressing time is 10 minutes;
(10) post processing
Successively buck and mitre saw limit are carried out to burr plate, form the standard plate of 1220 × 2440mm; Sanding is carried out to described standard plate, obtains fiberboard of the present invention.The thickness of described fiberboard is 10.15mm, and length is 2440.1mm, and width is 1220.15; The information such as its dimensional discrepancy, density and deviation are as shown in table 4.
Table 4 dimensional discrepancy, density and deviation and water content requirement
As known from Table 4, according to the method for the invention, the fiberboard utilizing Sunflower Pole to produce meets the medium density fibre board (MDF) of the furniture type used under standard GB/T/T11718-2009 specifies dry state.
Embodiment 2
Utilize Sunflower Pole to prepare a method for medium density fibre board (MDF), described method concrete steps are as follows:
(1) natural drying
Natural air drying process is carried out to Sunflower Pole, obtains the Sunflower Pole that moisture content is 8 ~ 10%;
(2) chip
Utilize charging roller be 3 to, cutting tool sharpening angle be 27 °, grit hole is 5cm
2drum chipper dried Sunflower Pole is chipped process, the mixed material that the sunflower sheet that to obtain by medulla and length be 3 ~ 50cm forms;
(3) selection by winnowing, screening
Sunflower Pole is natural longitudinal cracking after chipping, sunflower medulla and xylem natural separation, mixed material after chipping is transported to the end of belt feeder and naturally scatters, utilize wind-force that lighter medulla is blown out, sunflower sheet drops on screen cloth naturally, and the sunflower sheet being 35 ~ 50cm by length by screening re-starts process of chipping, and the sunflower sheet that length is less than 10cm removes, obtain the sunflower sheet that length is 10 ~ 35cm, be sunflower sheet for subsequent use;
(4) wash, store
Owing to being mixed with a large amount of silt and stone in described sunflower sheet for subsequent use, fragile cutter, therefore utilize spiral rinsing machine to carry out washing process to sunflower sheet for subsequent use, and the sunflower sheet for subsequent use after washing is stored 1.5h at feed bin, the moisture inner layer of sunflower sheet outer surface is moved, to balancing water content, obtain the sunflower sheet that moisture content is 45 ~ 50%;
(5) softening, defibrator process
Sunflower sheet after step (4) process is added to the boiling cylinder of defibrator, the steam pressure regulating boiling cylinder is 5kg/cm
2, boiling 5 minutes; Utilize defibrator to carry out defibrator process process to the sunflower sheet after boiling, obtain fiber; Wherein, the feed auger of defibrator is cone, and feed gap dimension is 30 ~ 40cm, and the axial compressive force of defibrator is 2 ~ 3kg/cm
2, the gap between two mills requires to regulate at any time along with raw material sofening treatment degree and fiber quality;
(6) applying glue, applying wax
In described fiber, add paraffin, addition is every cubic metre of fiberboard 7 kilograms) and sizing material (addition be dry fiber heavy 11%), mix, obtain composite fibre;
(7) dry
Drying duct is utilized to add in drying duct to the composite fibre after applying glue, applying wax, take hot-air as drying medium, controlling drying duct entrance hot air temperature is 125 DEG C ± 5 DEG C, outlet hot air temperature is 85 DEG C ± 5 DEG C, drying is carried out to described composite fibre, obtains the dry fiber that moisture content is 8 ~ 10%; Wherein, drying time is 4 seconds;
(8) to mat formation and precompressed
Utilize vacuum pneumatic spreading machine to mat formation to dried fiber, obtain slab band; Utilize continous way prognosis machine to carry out precompressed process to slab band, obtain thickness be 22cm thick slab band;
(9) hot pressing
Described slab band is carried out sawing process, obtains the slab be of the required size; Utilize multi-daylight press to carry out hot-pressing processing to the slab after sawing, obtain burr plate; Wherein, hot pressing temperature is 160 DEG C, and pressure is 18kg/cm
2, hot pressing time is 9 minutes;
(10) post processing
Successively buck and mitre saw limit are carried out to burr plate, form the standard plate of 1220 × 2440mm; Sanding is carried out to described standard plate, obtains fiberboard of the present invention.The thickness of described fiberboard is 10.15mm, and length is 2440.1mm, and width is 1220.15; The information such as its dimensional discrepancy, density and deviation are as shown in table 5.
Table 5 dimensional discrepancy, density and deviation and water content requirement
As known from Table 5, according to the method for the invention, the fiberboard utilizing Sunflower Pole to produce meets the medium density fibre board (MDF) of the furniture type used under standard GB/T/T11718-2009 specifies dry state.
Embodiment 3
Utilize Sunflower Pole to prepare a method for high density fiberboard, described method concrete steps are as follows:
(1) natural drying
Natural air drying process is carried out to Sunflower Pole, obtains the Sunflower Pole that moisture content is 8 ~ 10%;
(2) chip
Utilize charging roller be 3 to, cutting tool sharpening angle be 25 °, grit hole is 6cm
2drum chipper dried Sunflower Pole is chipped process, the mixed material that the sunflower sheet that to obtain by medulla and length be 3 ~ 50cm forms;
(3) selection by winnowing, screening
Sunflower Pole is natural longitudinal cracking after chipping, sunflower medulla and xylem natural separation, mixed material after chipping is transported to the end of belt feeder and naturally scatters, utilize wind-force that lighter medulla is blown out, sunflower sheet drops on screen cloth naturally, and the sunflower sheet being 35 ~ 50cm by length by screening re-starts process of chipping, and the sunflower sheet that length is less than 10cm removes, obtain the sunflower sheet that length is 10 ~ 35cm, be sunflower sheet for subsequent use;
(4) wash, store
Owing to being mixed with a large amount of silt and stone in described sunflower sheet for subsequent use, fragile cutter, therefore utilize spiral rinsing machine to carry out washing process to sunflower sheet for subsequent use, and the sunflower sheet for subsequent use after washing is stored 2h at feed bin, the moisture inner layer of sunflower sheet outer surface is moved, to balancing water content, obtain the sunflower sheet that moisture content is 45 ~ 50%;
(5) softening, defibrator process
Add boiling cylinder to the sunflower sheet after step (4) process, the steam pressure regulating boiling cylinder is 6kg/cm
2, boiling 4 minutes; Utilize defibrator to carry out defibrator process process to the sunflower sheet after boiling, obtain fiber; Wherein, the feed auger of defibrator is cone, and feed gap dimension is 30 ~ 40cm, and the axial compressive force of defibrator is 2 ~ 3kg/cm
2, the gap between two mills requires to regulate at any time along with raw material sofening treatment degree and fiber quality;
(6) applying glue, applying wax
Add in described fiber paraffin (addition is every cubic metre of fiberboard 7 kilograms of solid paraffins) and Lauxite sizing material (addition be dry fiber heavy 11%), mix, obtain composite fibre;
(7) dry
Drying duct is utilized to put into drying duct to the composite fibre after applying glue, applying wax, take hot-air as drying medium, controlling drying duct entrance hot air temperature is 125 DEG C ± 5 DEG C, outlet hot air temperature is 85 DEG C ± 5 DEG C, composite fibre row is entered to described composite fibre dry, obtain the dry fiber that moisture content is 8 ~ 10%; Wherein, drying time is 4 seconds;
(8) to mat formation and precompressed
Utilize vacuum pneumatic spreading machine to mat formation to dried fiber, obtain slab band; Utilize continous way prognosis machine to carry out precompressed process to slab band, obtain the slab that thickness is 25cm;
(9) hot pressing
Described slab is carried out sawing process, obtains the slab be of the required size; Utilize multi-daylight press to carry out hot-pressing processing to the slab after sawing, obtain plate blank; Wherein, hot pressing temperature is 180 DEG C, and pressure is 20kg/cm
2, hot pressing time is 8 minutes;
(10) post processing
Successively buck and mitre saw limit are carried out to burr plate, form the standard plate of 1220 × 2440mm; Sanding is carried out to described standard plate, obtains high density fiberboard of the present invention.The thickness of described fiberboard is 10.15mm, and length is 2440.1mm, and width is 1220.15; The information such as its dimensional discrepancy, density and deviation are as shown in table 6.
Table 6 dimensional discrepancy, density and deviation and water content requirement
As known from Table 6, according to the method for the invention, the high density fiberboard utilizing Sunflower Pole to produce meets the high density fiberboard of the furniture type used under standard GB/T/T11718-2009 specifies dry state.
The present invention includes but be not limited to above embodiment, every any equivalent replacement of carrying out under the principle of spirit of the present invention or local improvement, all will be considered as within protection scope of the present invention.
Claims (9)
1. utilize Sunflower Pole to prepare a method for medium/high density fiber board, it is characterized in that: described method concrete steps are as follows:
(1) natural drying
Natural air drying process is carried out to Sunflower Pole, obtains the Sunflower Pole that moisture content is 8 ~ 10%;
(2) chip
Dried Sunflower Pole is chipped process, the mixed material that the sunflower sheet that to obtain by medulla and length be 3 ~ 50cm forms;
(3) selection by winnowing, screening
Utilizing wind-force to be separated with medulla by sunflower sheet in mixed material, is that the sunflower sheet of 35 ~ 50cm re-starts process of chipping by length, and length is less than the sunflower sheet removing of 10cm, obtains the sunflower sheet that length is 10 ~ 35cm, is sunflower sheet for subsequent use;
(4) wash, store
Washing process is carried out to sunflower sheet for subsequent use, and by the sunflower sheet for subsequent use after washing at feed bin storage 1 ~ 2h, obtains the sunflower sheet that moisture content is 45 ~ 50%;
(5) softening, defibrator process
Softening and defibrator process process are carried out to the sunflower sheet after step (4) process, obtains fiber;
(6) applying glue, applying wax
In described fiber, add paraffin and sizing material, mix, obtain composite fibre;
(7) dry
Drying process is carried out to the composite fibre after applying glue applying wax, obtains the dry fiber that moisture content is 8 ~ 10%;
(8) to mat formation and precompressed
Dried fiber is mated formation, obtains slab band; Precompressed process is carried out to slab band, obtains the slab that thickness is 20 ~ 25cm;
(9) hot pressing
Described slab is carried out sawing process, obtains the slab be of the required size; Hot-pressing processing is carried out to the slab after sawing, obtains burr plate;
(10) post processing
Successively buck, mitre saw limit and sanding are carried out to burr plate, obtain described fiberboard.
2. a kind of method utilizing Sunflower Pole to prepare medium/high density fiber board according to claim 1, is characterized in that: employing drum chipper of chipping described in step (2); The charging roller of described wood chipping equipment is 2 ~ 3 right, and cutting tool sharpening angle is 23 ° ~ 27 °, and grit hole is 4 ~ 6cm
2.
3. a kind of method utilizing Sunflower Pole to prepare medium/high density fiber board according to claim 1, is characterized in that: the described washing of step (4) adopts spiral rinsing machine.
4. a kind of method utilizing Sunflower Pole to prepare medium/high density fiber board according to claim 1, is characterized in that: the described softening employing boiling cylinder of step (5), wherein, the steam pressure of boiling cylinder is 4.5 ~ 6kg/cm
2, digestion time is 4 ~ 6 minutes;
The described defibrator process of step (5) adopts defibrator, and wherein, the feed auger of defibrator is cone, and feed gap dimension is 30 ~ 40cm, and axial compressive force is 2 ~ 3kg/cm
2.
5. a kind of method utilizing Sunflower Pole to prepare medium/high density fiber board according to claim 1, is characterized in that: the addition of step (6) described sizing material is 11 ± 1% of step (7) described dry fiber weight; The addition of paraffin is preparation every cubic metre of fiberboard interpolation 4 ~ 8 kilograms of solid paraffins.
6. a kind of method utilizing Sunflower Pole to prepare medium/high density fiber board according to claim 1 or 5, is characterized in that: described sizing material is Lauxite.
7. a kind of method utilizing Sunflower Pole to prepare medium/high density fiber board according to claim 1, it is characterized in that: the described drying of step (7) adopts drying duct, drying medium is hot-air, wherein, drying tube entrance hot air temperature is 125 DEG C ± 5 DEG C, outlet hot air temperature is 85 DEG C ± 5 DEG C, and drying time is 4 seconds.
8. a kind of method utilizing Sunflower Pole to prepare medium/high density fiber board according to claim 1, is characterized in that: mat formation described in step (8) and adopt vacuum pneumatic spreading machine; Described precompressed adopts continuous prepress.
9. a kind of method utilizing Sunflower Pole to prepare medium/high density fiber board according to claim 1, is characterized in that: the described hot pressing of step (9) adopts multi-daylight press, and hot pressing temperature is 150 DEG C ~ 180 DEG C, and pressure is 18 ~ 20kg/cm
2, hot pressing time is 8 ~ 10 minutes.
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