CN1899783A - Method for producing plate using crop straw - Google Patents
Method for producing plate using crop straw Download PDFInfo
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- CN1899783A CN1899783A CN 200610045348 CN200610045348A CN1899783A CN 1899783 A CN1899783 A CN 1899783A CN 200610045348 CN200610045348 CN 200610045348 CN 200610045348 A CN200610045348 A CN 200610045348A CN 1899783 A CN1899783 A CN 1899783A
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- China
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- raw material
- wood shavings
- stalk
- straw
- hot pressing
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000010902 straw Substances 0.000 title claims description 118
- 239000000463 material Substances 0.000 claims abstract description 62
- 238000007731 hot pressing Methods 0.000 claims abstract description 45
- 239000000853 adhesive Substances 0.000 claims abstract description 27
- 230000001070 adhesive effect Effects 0.000 claims abstract description 27
- 238000003892 spreading Methods 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 19
- 238000005520 cutting process Methods 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000002203 pretreatment Methods 0.000 claims abstract description 10
- 239000002023 wood Substances 0.000 claims description 160
- 239000002994 raw material Substances 0.000 claims description 94
- 239000000203 mixture Substances 0.000 claims description 54
- 239000011347 resin Substances 0.000 claims description 37
- 229920005989 resin Polymers 0.000 claims description 37
- 230000015572 biosynthetic process Effects 0.000 claims description 33
- 241000209140 Triticum Species 0.000 claims description 29
- 235000021307 Triticum Nutrition 0.000 claims description 29
- 244000068988 Glycine max Species 0.000 claims description 28
- 235000010469 Glycine max Nutrition 0.000 claims description 28
- 239000003292 glue Substances 0.000 claims description 28
- 235000007164 Oryza sativa Nutrition 0.000 claims description 27
- 235000009566 rice Nutrition 0.000 claims description 27
- 230000013011 mating Effects 0.000 claims description 20
- 240000008042 Zea mays Species 0.000 claims description 18
- 235000016383 Zea mays subsp huehuetenangensis Nutrition 0.000 claims description 18
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 18
- 235000009973 maize Nutrition 0.000 claims description 18
- 229920000742 Cotton Polymers 0.000 claims description 15
- 235000014676 Phragmites communis Nutrition 0.000 claims description 15
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 7
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- 239000012948 isocyanate Substances 0.000 claims description 6
- 239000004368 Modified starch Substances 0.000 claims description 5
- 229920000881 Modified starch Polymers 0.000 claims description 5
- 235000019426 modified starch Nutrition 0.000 claims description 5
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 4
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 4
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 claims description 4
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 claims description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 229960004643 cupric oxide Drugs 0.000 claims description 3
- 238000005755 formation reaction Methods 0.000 claims description 2
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 2
- 239000000395 magnesium oxide Substances 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- 238000005453 pelletization Methods 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 abstract 1
- 241000209094 Oryza Species 0.000 description 26
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 13
- 239000003795 chemical substances by application Substances 0.000 description 10
- 238000002309 gasification Methods 0.000 description 10
- 239000000835 fiber Substances 0.000 description 7
- 235000019256 formaldehyde Nutrition 0.000 description 6
- 241000208202 Linaceae Species 0.000 description 5
- 235000004431 Linum usitatissimum Nutrition 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 239000003063 flame retardant Substances 0.000 description 5
- 238000004898 kneading Methods 0.000 description 5
- 238000010030 laminating Methods 0.000 description 5
- 238000012856 packing Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 4
- 240000004928 Paspalum scrobiculatum Species 0.000 description 1
- 235000003675 Paspalum scrobiculatum Nutrition 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
Landscapes
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The process of producing plate with crop stalks includes the steps of preparing material, preparing shavings, mixing with adhesive, spreading, hot pressing, pre-treatment, product treatment and other steps. The present invention features the first treating the crop stalks into two kinds of material, material A and material B in the weight ratio of 2-8 to 2-8; rolling, pelletizing and cutting the material A and the material B separately into material A unit of 60-90mm length and material B unit of 50-70mm length; and the separate shaving and humidifying the material A unit and the material B unit into shaving A with drying temperature of 105-120 deg.c and water content of 1-4 % and shaving B with drying temperature of 30-70 deg.c and water content of 10.5-14 %. The present invention has the advantages of abundant material, high plate quality, high production efficiency, low production cost, etc.
Description
(1) technical field: the present invention relates to a kind of method of producing sheet material, relate in particular to a kind of method of utilizing crop straws for producing sheet material.
(2) background technology: in the past; people are accustomed to using timber to make wood-based plate; along with China's putting more effort to forest conservation; timber resources is more and more nervous; Given this impel people to utilize non-wooden material to produce sheet material; have at present and use rice grass to make sheet material; have and use the wheat straw stalk to make sheet material; but all cause can't suitability for industrialized production because of raw material should not be purchased on a large scale; add their adhesive of use and generally be isocyanates; and resin added is 3%-5%, and cost is uncontrollable, is unfavorable for competing with wood-based product.
(3) summary of the invention: the objective of the invention is to overcome the deficiency of above-mentioned prior art and a kind of raw material abundance is provided, board quality and production efficiency height have reduced the cost of sheet material, high-strength anti-flaming, the product qualified rate height, a kind of method of utilizing crop straws for producing sheet material of difficult deformation.
Purpose of the present invention can reach by following measure: a kind of method of utilizing crop straws for producing sheet material, and it comprises raw material processing, wood shavings preparation, glue mixing, mats formation, hot pressing, pre-treatment, finished product treatment step, it is characterized in that:
Raw material classification and processing: agricultural crop straw is defined as A, two kinds of raw materials of B, the A raw material is one or more the mixture in the agricultural crop straw, be main material, the B raw material is one or more the mixture in the agricultural crop straw, be auxiliary material, A, the weight proportion scope of B raw material is 8-2: 2-8, A raw material and B raw material are entered separately rivet bucker respectively, thresing machine, cutting machine is through spreading, threshing, cut into the stalk unit, the A raw material stalk long 60mm-90mm in unit, the B raw material stalk long 50-70mm in unit;
Wood shavings preparations: A raw material after will cutting off and B raw material stalk unit enter respectively to rub in the wire kneading machine thread makes wood shavings, and then enter drying machine respectively and spare wet outer reason, 105-120 ℃ of the particle drying temperature of A raw material wood shavings, wood shavings moisture content 1%-4%, 30-70 ℃ of the particle drying temperature of B raw material wood shavings, wood shavings moisture content 10.5%-14%.
In order further to realize purpose of the present invention, the glue mixing step is that above-mentioned A raw material wood shavings and B raw material wood shavings are carried out glue mixing respectively, at first utilize centrifugal atomizer that MDI glue is rotated at a high speed, by centrifugal force MDI is thrown away with A raw material wood shavings, B raw material wood shavings and to mix respectively, the resin added of A raw material wood shavings is the 1.5%-2.5% of over dry wood shavings weight, and the resin added of B raw material wood shavings is the 1%-2% of over dry wood shavings weight; Then utilize the screw pump glue gasification ejection of will preventing fires to mix respectively with A raw material wood shavings, B raw material wood shavings with above-mentioned respectively again, the resin added of A raw material wood shavings is over dry wood shavings weight 10%-30%, and the resin added of B raw material wood shavings is the 5%-10% of over dry wood shavings weight; And then utilize screw pump that auxiliary adhesive gasification ejection is mixed respectively with A raw material wood shavings, B raw material wood shavings with above-mentioned, and the resin added of A raw material wood shavings is over dry wood shavings weight 5%-10%, the resin added of B raw material wood shavings is the 5%-10% of over dry wood shavings weight.
In order further to realize purpose of the present invention, the step of mating formation is that the raw material after good is mated formation with applying glue, adopt three roads, the four road prepressing procedures of mating formation, precompressed behind one deck B raw material of usefulness classification spreading machine shop, first road, second road is put down and precompressed at shop one deck A raw material then with mechanical spreading machine, the 3rd road repaves the precompressed then of one deck B raw material with classification spreading machine shop, enter whole precompressed at last, slab thickness after precompressed is controlled at 4-7 times of production board, slab employing backing plate loop back device after mating formation is transported to multidaylight press and carries out hot pressing, coating release agent on the backing plate.
In order further to realize purpose of the present invention, heat-press step is that the slab after mating formation is carried out hot pressing, adopts multidaylight press, and last laminating sheet uses releasing agent, hot pressing pressure 3.2-4.6Mpa's, hot pressing time 0.3-0.9min/ millimeter, hot pressing temperature 180-200 ℃.
In order further to realize that purpose of the present invention, pre-treatment step are to the processing of spraying water of the sheet material after the hot pressing, make its moisture content be controlled at 6%-10%.Best moisture content is controlled at 8%.
In order to realize that further purpose of the present invention, finished product treatment step are with the sheet material cooling, cutting edge, stacking, sanding, fixed thick, packing.
For further realization purpose of the present invention, described A, the weight proportion scope of B raw material is 7-3: 3-7.
For further realization purpose of the present invention, described A, the weight proportion scope of B raw material is 6-4: 4-6.
In order further to realize that purpose of the present invention, described A, B raw material are one or more the mixture in wheat straw stalk, rice straw, rape stalk, cotton stalk, numb stalk, maize straw, soybean stalk, the reed straw.
In order to realize that further purpose of the present invention, described A raw material are the easily agricultural crop straw of purchase of this season, the B raw material is the agricultural crop straw that this season is difficult for purchase.
In order further to realize purpose of the present invention, described MDI glue is the methyl diphenylene diisocyanate adhesive.
In order further to realize purpose of the present invention, described fire prevention glue is inorganic interpolation adhesive.
In order further to realize purpose of the present invention, described inorganic interpolation adhesive is a cupric oxide,
Copper chloride, magnesium chloride, aluminium oxide, aluminium chloride, magnesia, phosphoric acid, the mixture of one or more in the aluminum phosphate.
In order further to realize that purpose of the present invention, described auxiliary adhesive are one or more the mixture in aqueous macromolecule-isocyanate adhesive and the modified starch adhesive.
In order further to realize purpose of the present invention, to the processing of spraying water of the sheet material after the hot pressing, make its moisture content be controlled at 8% in the described pre-treatment.
The present invention can produce following good effect compared with the prior art:
1, raw material adopts various stalks to mix, and is not subjected to any restriction, no matter can both guarantee the abundance of raw material any season.
2, main material and auxiliary material moisture content can be adjusted, and have increased the hot pressing temperature transmission speed, have improved the hardening time of adhesive, and then have improved board quality and production efficiency.
3, utilize the combination of multiple organic and inorganic adhesive, promptly reduced the cost of sheet material, increased characteristics such as timber intensity is fire-retardant simultaneously again, increased its market competitiveness.
4, adopt multiple tracks to mat formation, the multiple tracks precompressed solves the diffusing base problem of product, has improved product qualified rate.
5, adopt the method for later stage control sheet material moisture content, solved the sheet deformation problem that produces because of regional humidity difference.
6, solved the knotty problem of suitability for industrialized production by layout to integrated artistic and equipment.
The present invention after testing, density variation in its plate, moisture content, internal bond strength, the MOR elastic modelling quantity, screw power surpasses the standard GB/T4897-92 requirement of wooden flake board, free formaldehyde is pressed GB/T11718-1999 and is detected, and the result does not measure, and burst size of methanal reaches middle A level requirement; And the fire-resistant detection fire protection flame retarding of process fire-fighting reaches the difficult combustion of GB8624 B level.
(4) specific embodiment: following preferred forms of the present invention is elaborated:
Embodiment 1:
(1) getting wheat straw stalk 560kg is main material for the A raw material, getting numb stalk 240kg is auxiliary material for the B raw material, A, the weight proportion scope of B raw material is 7: 3, and wheat straw stalk and numb stalk are entered separately rivet bucker respectively, thresing machine, cutting machine, through spreading, threshing, cut into the long 60mm of wheat straw stalk, the stalk unit of the long 50mm of numb stalk;
(2) wood shavings preparation: wheat straw stalk after will cutting off and numb stalk enter respectively to rub in the wire kneading machine thread makes wood shavings, and then enter drying machine respectively and spare wet outer reason, 105 ℃ of the particle drying temperature of wheat straw stalk wood shavings, wood shavings moisture content 4%, 30 ℃ of the particle drying temperature of fiber crops stalk wood shavings, wood shavings moisture content 14%;
(3) glue mixing: above-mentioned wheat straw stalk wood shavings and waste of flax wood shavings are carried out glue mixing respectively,
At first utilize centrifugal atomizer that the methyl diphenylene diisocyanate adhesive is rotated at a high speed, by centrifugal force MDI is thrown away with wheat straw stalk wood shavings, numb stalk wood shavings and to mix respectively, the resin added of wheat straw stalk wood shavings is 2.5% of an over dry wood shavings weight, and the resin added of numb stalk wood shavings is 1.5% of an over dry wood shavings weight;
Then utilize screw pump with cupric oxide gasification ejection again, mix respectively with above-mentioned wheat straw stalk wood shavings, numb stalk wood shavings respectively, the resin added of wheat straw stalk wood shavings is an over dry wood shavings weight 10%, and the resin added of numb stalk wood shavings is 5% of an over dry wood shavings weight;
And then utilize screw pump that aqueous macromolecule-isocyanate adhesive gasification ejection is mixed respectively with wheat straw stalk wood shavings, numb stalk wood shavings with above-mentioned, the resin added of wheat straw stalk wood shavings is an over dry wood shavings weight 5%, and the resin added of numb stalk wood shavings is 5% of an over dry wood shavings weight;
(4) mat formation: the raw material that will execute behind the glue is mated formation, adopt three roads, the four road prepressing procedures of mating formation, precompressed behind one deck fiber crops stalk of usefulness classification spreading machine shop, first road, second road is put down and precompressed at shop one deck wheat straw stalk raw material then with mechanical spreading machine, the 3rd road repaves the precompressed then of one deck fiber crops stalk with classification spreading machine shop, enter whole precompressed at last, slab thickness after precompressed is controlled at 70mm, slab employing backing plate loop back device after mating formation is transported to multidaylight press and carries out hot pressing, guarantee the diffusing base of slab, coating release agent on the backing plate;
(5) hot pressing: the slab after will mating formation carries out hot pressing, adopts multidaylight press, and for preventing the forcing press haftplatte, last laminating sheet uses releasing agent, hot pressing pressure 4.2Mpa, hot pressing time 0.8min/ millimeter, 190 ℃ of hot pressing temperatures;
(6) pre-treatment:, make its moisture content be controlled at 6% to the processing of spraying water of the sheet material after the hot pressing;
(7) then with sheet material cooling, cutting edge is of a size of 4 * 8 chis (1220mm * 2440mm), stacking 24 hours, sanding, fixed thick, packing.
According to every performance that the standard GB/T4897-92 of wooden flake board tests straw stalk plate, its specific performance is as follows:
Density: 750kg/cm3
Density variation in the plate :+4 ,-3.5
Moisture content: 6%
Internal bond strength: 0.50MPa
MOR: 22MPa
Elastic modelling quantity: 2500MPa
Screw power (N) plate face 1400 edges of boards 1300
Burst size of methanal: do not measure
The difficult combustion of flame retardant rating: GB8624 B
Embodiment 2:
(1) mixture of getting cotton stalk, numb stalk, soybean stalk and reed straw altogether 800kg be main material for the A raw material, getting maize straw 200kg is auxiliary material for the B raw material, A, the weight proportion scope of B raw material is 8: 2, the mixture of cotton stalk, numb stalk, soybean stalk and reed straw and maize straw are entered separately rivet bucker respectively, thresing machine, cutting machine, through spreading, threshing, cut into the long 90mm of being of mixture of cotton stalk, numb stalk, soybean stalk and reed straw, numb stalk length is the stalk unit of 70mm;
(2) wood shavings preparation: the mixture of the cotton stalk after will cutting off, numb stalk, soybean stalk and reed straw and maize straw enter respectively to rub in the wire kneading machine thread makes wood shavings, and then enter drying machine respectively and spare wet outer reason, 120 ℃ of the particle drying temperature of the mixture wood shavings of cotton stalk, numb stalk, soybean stalk and reed straw, wood shavings moisture content 1%, 70 ℃ of the particle drying temperature of fiber crops stalk wood shavings, wood shavings moisture content 10.5%;
(3) glue mixing: mixture wood shavings and waste of flax wood shavings to above-mentioned cotton stalk, numb stalk, soybean stalk and reed straw carry out glue mixing respectively,
At first utilize centrifugal atomizer that the methyl diphenylene diisocyanate adhesive is rotated at a high speed, by centrifugal force MDI is thrown away with the mixture wood shavings of cotton stalk, numb stalk, soybean stalk and reed straw, numb stalk wood shavings and to mix respectively, the resin added of the mixture wood shavings of cotton stalk, numb stalk, soybean stalk and reed straw is 2% of an over dry wood shavings weight, and the resin added of numb stalk wood shavings is 1% of an over dry wood shavings weight;
Then utilize screw pump that copper chloride, phosphoric acid and aluminum phosphate mixture gasification ejection are mixed respectively with the mixture wood shavings of above-mentioned cotton stalk, numb stalk, soybean stalk and reed straw, numb stalk wood shavings respectively again, the resin added of the mixture wood shavings of cotton stalk, numb stalk, soybean stalk and reed straw is an over dry wood shavings weight 30%, and the resin added of numb stalk wood shavings is 10% of an over dry wood shavings weight;
And then utilize screw pump that the mixture gasification ejection of aqueous macromolecule-isocyanate adhesive and modified starch adhesive is mixed respectively with the mixture wood shavings of above-mentioned and cotton stalk, numb stalk, soybean stalk and reed straw, numb stalk wood shavings, the resin added of the mixture wood shavings of cotton stalk, numb stalk, soybean stalk and reed straw is an over dry wood shavings weight 10%, and the resin added of numb stalk wood shavings is 10% of an over dry wood shavings weight;
(4) mat formation: the raw material that will execute behind the glue is mated formation, adopt three roads, the four road prepressing procedures of mating formation, precompressed behind one deck fiber crops stalk of usefulness classification spreading machine shop, first road, the cotton stalk of one deck is being spread with mechanical spreading machine in second road, the fiber crops stalk, the mixture material of soybean stalk and reed straw is put down and precompressed then, the 3rd road repaves the precompressed then of one deck fiber crops stalk with classification spreading machine shop, enter whole precompressed at last, slab thickness after precompressed is controlled at the 40mm of production board, slab employing backing plate loop back device after mating formation is transported to multidaylight press and carries out hot pressing, guarantee the diffusing base of slab, coating release agent on the backing plate;
(5) hot pressing: the slab after will mating formation carries out hot pressing, adopts multidaylight press, and for preventing the forcing press haftplatte, last laminating sheet uses releasing agent, hot pressing pressure 4.6Mpa, hot pressing time 0.9min/ millimeter, 200 ℃ of hot pressing temperatures;
(6) pre-treatment:, make its moisture content be controlled at 10% to the processing of spraying water of the sheet material after the hot pressing;
(7) then with sheet material cooling, cutting edge is of a size of 4 * 8 chis (1220mm * 2440mm), stacking 24 hours, sanding, fixed thick, packing.
According to every performance that the standard GB/T4897-92 of wooden flake board tests straw stalk plate, its specific performance is as follows:
Density: 700kg/cm3
Density variation in the plate :+4 ,-3.5
Moisture content: 10%
Internal bond strength: 0.38MPa
MOR: 18MPa
Elastic modelling quantity: 2300MPa
Screw power (N) plate face 1200 edges of boards 1200
Burst size of methanal: do not measure
The difficult combustion of flame retardant rating: GB8624 B
Embodiment 3:
(1) the mixture 600kg that gets wheat straw stalk and maize straw is a main material for the A raw material, water intaking rice straw 400kg is an auxiliary material for the B raw material, A, the weight proportion scope of B raw material is 6: 4, and the mixture of wheat straw stalk and maize straw and rice straw are entered separately rivet bucker respectively, thresing machine, cutting machine, through spreading, threshing, cut into the long 70mm of being of mixture of wheat straw stalk and maize straw, rice straw length is the stalk unit of 60mm;
(2) wood shavings preparation: the wheat straw stalk after will cutting off and the mixture of maize straw and rice straw enter respectively to rub in the wire kneading machine thread makes wood shavings, and then enter drying machine respectively and spare wet outer reason, 110 ℃ of the particle drying temperature of the mixture wood shavings of wheat straw stalk and maize straw, wood shavings moisture content 3%, 50 ℃ of the particle drying temperature of rice straw wood shavings, wood shavings moisture content 12%;
(3) glue mixing: mixture wood shavings and waste of flax wood shavings to above-mentioned wheat straw stalk and maize straw carry out glue mixing respectively,
At first utilize centrifugal atomizer that the methyl diphenylene diisocyanate adhesive is rotated at a high speed, by centrifugal force MDI is thrown away with mixture wood shavings, the rice straw wood shavings of wheat straw stalk and maize straw and to mix respectively, the resin added of the mixture wood shavings of wheat straw stalk and maize straw is 1.5% of an over dry wood shavings weight, and the resin added of rice straw wood shavings is 2% of an over dry wood shavings weight;
Then utilize screw pump that the mixture gasification ejection of copper chloride and aluminium oxide is mixed respectively with mixture wood shavings, the rice straw wood shavings of above-mentioned wheat straw stalk and maize straw respectively again, the resin added of the mixture wood shavings of wheat straw stalk and maize straw is an over dry wood shavings weight 15%, and the resin added of rice straw wood shavings is 8% of an over dry wood shavings weight;
And then utilize screw pump that modified starch adhesive gasification ejection is mixed respectively with mixture wood shavings, the rice straw wood shavings of above-mentioned wheat straw stalk and maize straw, the resin added of the mixture wood shavings of wheat straw stalk and maize straw is an over dry wood shavings weight 8%, and the resin added of rice straw wood shavings is 8% of an over dry wood shavings weight;
(4) mat formation: the raw material with applying glue after good is mated formation, adopt three roads, the four road prepressing procedures of mating formation, precompressed behind one deck waste of flax of usefulness classification spreading machine shop, first road, second road is put down and precompressed at the mixture of shop one deck wheat straw stalk and maize straw then with mechanical spreading machine, the 3rd road repaves the precompressed then of one deck rice straw with classification spreading machine shop, enter whole precompressed at last, slab thickness after precompressed is controlled at the 60mm of production board, slab employing backing plate loop back device after mating formation is transported to multidaylight press and carries out hot pressing, guarantee the diffusing base of slab, coating release agent on the backing plate;
(5) hot pressing: the slab after will mating formation carries out hot pressing, adopts multidaylight press, and for preventing the forcing press haftplatte, last laminating sheet uses releasing agent, hot pressing pressure 3.2Mpa, hot pressing time 0.3min/ millimeter, 180 ℃ of hot pressing temperatures;
(6) pre-treatment:, make its moisture content be controlled at 8% to the processing of spraying water of the sheet material after the hot pressing;
(7) then with sheet material cooling, cutting edge is of a size of 4 * 8 chis (1220mm * 2440mm), stacking 24 hours, sanding, fixed thick, packing.
According to every performance that the standard GB/T4897-92 of wooden flake board tests straw stalk plate, its specific performance is as follows:
Density: 730kg/cm3
Density variation in the plate :+4 ,-3.5
Moisture content: 8%
Internal bond strength: 0.43MPa
MOR: 21MPa
Elastic modelling quantity: 2400Mpa
Screw power (N) plate face 1300 edges of boards 1200
Burst size of methanal: do not measure
The difficult combustion of flame retardant rating: GB8624 B
Embodiment 4:
(1) getting soybean stalk 400kg is main material for the A raw material, the mixture 600kg of water intaking rice straw and rape stalk is an auxiliary material for the B raw material, A, the weight proportion scope of B raw material is 4: 6, and the mixture of soybean stalk and rice straw and rape stalk is entered separately rivet bucker respectively, thresing machine, cutting machine, through spreading, threshing, cut into the long 60mm of being of soybean stalk, the mixture length of rice straw and rape stalk is the stalk unit of 54mm;
(2) wood shavings preparation: the mixture of soybean stalk after will cutting off and rice straw and rape stalk enters respectively to rub in the wire kneading machine thread makes wood shavings, and then enter drying machine respectively and spare wet outer reason, 115 ℃ of the particle drying temperature of soybean stalk wood shavings, wood shavings moisture content 2%, 50 ℃ of the particle drying temperature of the mixture wood shavings of rice straw and rape stalk, wood shavings moisture content 12.5%;
(3) glue mixing: above-mentioned soybean stalk wood shavings and waste of flax wood shavings are carried out glue mixing respectively,
At first utilize centrifugal atomizer that the methyl diphenylene diisocyanate adhesive is rotated at a high speed, by centrifugal force MDI is thrown away with the mixture wood shavings of soybean stalk wood shavings, rice straw and rape stalk and to mix respectively, the resin added of soybean stalk wood shavings is 2% of an over dry wood shavings weight, and the resin added of the mixture wood shavings of rice straw and rape stalk is 1.5% of an over dry wood shavings weight;
Then utilize screw pump that aluminium oxide gasification ejection is mixed respectively with the mixture wood shavings of soybean stalk wood shavings, rice straw and rape stalk with above-mentioned respectively again, the resin added of soybean stalk wood shavings is an over dry wood shavings weight 10%, and the resin added of the mixture wood shavings of rice straw and rape stalk is 9% of an over dry wood shavings weight;
And then utilize screw pump that the mixture gasification ejection of aqueous macromolecule-isocyanate adhesive and modified starch adhesive is mixed respectively with the mixture wood shavings of soybean stalk wood shavings, rice straw and rape stalk with above-mentioned, the resin added of soybean stalk wood shavings is an over dry wood shavings weight 7%, and the resin added of the mixture wood shavings of rice straw and rape stalk is 7% of an over dry wood shavings weight;
(4) mat formation: the raw material that will execute behind the glue is mated formation, adopt three roads, the four road prepressing procedures of mating formation, precompressed behind the mixture material of first road usefulness classification spreading machine shop one deck rice straw and rape stalk, second road is put down and precompressed at shop one deck soybean stalk raw material then with mechanical spreading machine, the 3rd road repaves the mixture material precompressed then of one deck rice straw and rape stalk with classification spreading machine shop, enter whole precompressed at last, slab thickness after precompressed is controlled at the 70mm of production board, slab employing backing plate loop back device after mating formation is transported to multidaylight press and carries out hot pressing, guarantee the diffusing base of slab, coating release agent on the backing plate;
(5) hot pressing: the slab after will mating formation carries out hot pressing, adopts multidaylight press, and for preventing the forcing press haftplatte, last laminating sheet uses releasing agent, hot pressing pressure 4.2Mpa, hot pressing time 0.8min/ millimeter, 190 ℃ of hot pressing temperatures;
(6) pre-treatment:, make its moisture content be controlled at 8% to the processing of spraying water of the sheet material after the hot pressing;
(7) then with sheet material cooling, cutting edge is of a size of 4 * 8 chis (1220mm * 2440mm), stacking 24 hours, sanding, fixed thick, packing.
According to every performance that the standard GB/T4897-92 of wooden flake board tests straw stalk plate, its specific performance is as follows:
Density: 720kg/cm3
Density variation in the plate :+4 ,-3.5
Moisture content: 8%
Internal bond strength: 0.45Mpa
MOR: 21MPa
Elastic modelling quantity: 2400Mpa
Screw power (N) plate face 1300 edges of boards 1200
Burst size of methanal: do not measure
The difficult combustion of flame retardant rating: GB8624 B.
Claims (10)
1, a kind of method of utilizing crop straws for producing sheet material, it comprises raw material processing, wood shavings preparation, glue mixing, mats formation, hot pressing, pre-treatment, finished product treatment step, it is characterized in that:
Raw material classification and processing: agricultural crop straw is defined as A, and two kinds of raw materials of B, A raw material are one or more the mixture in the agricultural crop straw, be main material, the B raw material is one or more the mixture in the agricultural crop straw, is auxiliary material, A, the weight proportion scope of B raw material is 8-2: 2-8, respectively through spreading, threshing cuts into the stalk unit with A raw material and B raw material, the A raw material stalk long 60mm-90mm in unit, the B raw material stalk long 50-70mm in unit;
The wood shavings preparation: A raw material after will cutting off and B raw material stalk unit are made wood shavings respectively, and then spare respectively to wet and manage outward, 105-120 ℃ of the particle drying temperature of A raw material wood shavings, wood shavings moisture content 1%-4%, 30-70 ℃ of the particle drying temperature of B raw material wood shavings, wood shavings moisture content 10.5%-14%.
2, a kind of method of utilizing crop straws for producing sheet material according to claim 1, it is characterized in that described glue mixing step is that above-mentioned A raw material wood shavings and B raw material wood shavings are carried out glue mixing respectively, at first MDI glue is mixed respectively with A raw material wood shavings, B raw material wood shavings, the resin added of A raw material wood shavings is the 1.5%-2.5% of over dry wood shavings weight, and the resin added of B raw material wood shavings is the 1%-2% of over dry wood shavings weight; The glue of then will preventing fires mixes respectively with A raw material wood shavings, B raw material wood shavings with above-mentioned respectively, and the resin added of A raw material wood shavings is over dry wood shavings weight 10%-30%, and the resin added of B raw material wood shavings is the 5%-10% of over dry wood shavings weight; And then auxiliary adhesive mixed respectively with above-mentioned A raw material wood shavings, B raw material wood shavings, the resin added of A raw material wood shavings is over dry wood shavings weight 5%-10%, the resin added of B raw material wood shavings is the 5%-10%. of over dry wood shavings weight
3, a kind of method of utilizing crop straws for producing sheet material according to claim 1, it is characterized in that the described step of mating formation is that the raw material after good is mated formation with applying glue, adopt three roads, the four road prepressing procedures of mating formation, precompressed behind one deck B raw material of usefulness classification spreading machine shop, first road, second road is put down and precompressed at shop one deck A raw material then with mechanical spreading machine, the 3rd road repaves the precompressed then of one deck B raw material with classification spreading machine shop, enter whole precompressed at last, slab thickness after precompressed is controlled at 4-7 times of production board, and the slab after mating formation is transported to multidaylight press and carries out hot pressing.
4, a kind of method of utilizing crop straws for producing sheet material according to claim 1, it is characterized in that described heat-press step is that the slab after mating formation is carried out hot pressing, hot pressing pressure 3.2-4.6Mpa's, hot pressing time 0.3-0.9min/ millimeter, hot pressing temperature 180-200 ℃.
5, a kind of method of utilizing crop straws for producing sheet material according to claim 1 is characterized in that described pre-treatment step is to the processing of spraying water of the sheet material after the hot pressing, makes its moisture content be controlled at 6%-10%.
6, a kind of method of utilizing crop straws for producing sheet material according to claim 1, it is characterized in that described A, the B raw material is one or more the mixture in wheat straw stalk, rice straw, rape stalk, cotton stalk, numb stalk, maize straw, soybean stalk, the reed straw.
7, according to claim 1 or 6 described a kind of methods of utilizing crop straws for producing sheet material, it is characterized in that described A raw material is the easily agricultural crop straw of purchase of this season, the B raw material is the agricultural crop straw that this season is difficult for purchase.
8, a kind of method of utilizing crop straws for producing sheet material according to claim 2 is characterized in that described MDI glue is the methyl diphenylene diisocyanate adhesive.
9, a kind of method of utilizing crop straws for producing sheet material according to claim 2 is characterized in that described fire prevention glue is inorganic interpolation adhesive, is cupric oxide, copper chloride, magnesium chloride, aluminium oxide, aluminium chloride, magnesia, phosphoric acid, the mixture of one or more in the aluminum phosphate.
10, a kind of method of utilizing crop straws for producing sheet material according to claim 2 is characterized in that described auxiliary adhesive is one or more the mixture in aqueous macromolecule-isocyanate adhesive and the modified starch adhesive.
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