CN104960066A - Grass tree structural board and production technology thereof - Google Patents
Grass tree structural board and production technology thereof Download PDFInfo
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- CN104960066A CN104960066A CN201510323980.3A CN201510323980A CN104960066A CN 104960066 A CN104960066 A CN 104960066A CN 201510323980 A CN201510323980 A CN 201510323980A CN 104960066 A CN104960066 A CN 104960066A
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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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- 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
- B27N3/14—Distributing or orienting the particles or 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
- B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
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- Life Sciences & Earth Sciences (AREA)
- 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 grass tree structural board adopting straw and branch firewood as raw materials and a production technology thereof. Waste generated in the agricultural production process is fully utilized, crop straw of wheat straw, straw, cornstalks, sorghum stalks and the like and branch firewood waste abandoned in the production construction and updating modification process are used as raw materials, the novel artificial plate manufactured through the brand-new production technology is used for replacing traditional solid wood products to turn the straw into wealth, and the value of the crop straw is greatly improved. Meanwhile, the production cost of the plate is effectively lowered, and great economic benefits and social value are achieved. One-time hot press molding is achieved, and the problems that due to the fact that stacked gaps exist between wood sheets of an existing oriented strand board, the surface of a plate is uneven, and the plate cannot be directly used for producing surface decorative plates are solved. The density of a fiber surface plate layer can be 0.8 g/cm<3>, the density of a wood shaving core plate layer can be 0.78 g/cm<3>, the static bending intensity of the plate can reach 35.4 MPa effectively, and the thickness swelling rate of water absorption is smaller than 2% within 36 hours.
Description
Technical field
The present invention relates to artificial board production technical field, particularly a kind of straw, branch bavin are grass tree structural slab and the production technology thereof of raw material.
Background technology
Global concern is subject in current climate change; conserve forests and become human consensus; and the timber resources that the world can cut down reduces day by day, socio-economic development under timber and the ever-increasing situation of goods demand thereof, utilize the various dalle of crop straws for producing, become a kind of trend.Agricultural crop straw comprises: cereal crops stalk (wheat straw, straw, cornstalk, sorghum stalk etc.), industrial crops stalk (cotton stalk, hemp stalk, reed stalk, Sunflower Stalk, beans stalk etc.).China produces a considerable number of agricultural crop straw every year, agricultural crop straw raw material is adopted to manufacture dalle, both the forest reserves can be saved, can be again a large amount of agricultural crop straws to find a way out, avoid the contaminated environment because of crop straw burning, increase farmers' income simultaneously, promote the solution of agriculture, rural areas and farmers problem.
But the straw particieboard production efficiency that traditional handicraft is produced is low, and panel density is little, expansion rate of water absorption is high, and density can only reach 0.70 ~ 0.76g/cm
3, expansion rate of water absorption reaches 4.5 ~ 6.0%, and MOR is low, can only reach 12 ~ 20MPa, and meanwhile, the quality of production is unstable, and product quality fluctuation is comparatively large, often occurs that there is rough situation on surface, has a strong impact on the application of sheet material.The method that tradition solves surface irregularity is after first carrying out surely thick sanding process to the surface of oriented wood chipboard, carry out secondary again and paste density board or wood peel again, its weak point existed is: complex process, production efficiency are low, cost is high, and sheet material imbibition easy to crack, easy, MOR are low, difficult quality guarantee.
Summary of the invention
The object of the invention is for above-mentioned the deficiencies in the prior art, there is provided a kind of with straw and branch bavin be raw material grass tree structural slab and production technology thereof, its production technology is simple, cost is low, efficiency is high, the board quality adopting this explained hereafter to go out is stablized, compact structure, expansion rate of water absorption are low and MOR is high, and also solve oriented wood chipboard can not the drawback of direct surface decoration simultaneously.
The technical scheme adopted for realizing object of the present invention is: a kind of with the production technology of straw and the branch bavin grass tree structural slab that is raw material, comprises the steps:
1, straw raw material through segment cutter block be 8 ~ 20cm length after, enter again broken operation;
2, straw raw material section enters drying process after the strip section that desintegrator is ground into 1 ~ 2cm;
3, the straw raw material of broken mistake is dry through drying machine again, and moisture controls 3%;
4, dried straw raw material, through refiner, carries out cold grinding at normal temperatures and obtains 30 ~ 40 object fibers;
5, fiber separation, sends qualified fiber into feed bin, and underproof fiber turns back to precision grinding process secondary fine grinding, follows with one's eyes into feed bin until fiber reaches 30 ~ 40;
6, qualified fiber sends into glue mixer glue mixing, by 65 ~ 90kg/m through feed bin
3resin added apply adhesive, obtain glue mixing fiber;
7, branch bavin is after rectangular chipper flaking, enters drying machine, makes its moisture content 3 ~ 5%, then press 1m after drying
3the ratio applying glue of wood chip 50 ~ 60kg adhesive, after applying glue, moisture control is between 8 ~ 12%, obtains applying glue wood chip;
8, overlay following table flaggy, core layer, upper dash board layer successively by spreading machine, the glue mixing fiber that upper and lower dash board layer is obtained by step 6 is determined thickness through spreading machine and is determined weight and mat formation, and the applying glue wood chip that core layer is obtained by step 7 is mated formation through spreading machine;
9, slab step 8 paved is through preformer precompressed, and precompressed pressurization oil cylinder working-pressure is between 7 ~ 12Mpa, and compression ratio is at 6:1;
10, slab after precompressed enters HTHP press, through hot-press solidifying process, plain plate must be solidified, wherein, platen temperature is at 180 DEG C ~ 200 DEG C, first peak pressure P 1 limit value is 135kgf/cm22, low-pressure pressure retaining pressure is P2/P3 is 25 ~ 45 kgf/cm2, high pressure dwell pressure is P4/P5 is 90 ~ 115 kgf/cm2, first time off-load keeps pressure P 6 to be 60kgf/cm2, second time off-load keeps pressure P 7 to be 40 kgf/cm2, third time off-load keeps pressure P 8 to be 25 kgf/cm2, 4th off-load keeps pressure P 9 to be 15kgf/cm2, main pressure time T1 is 120 seconds, fixed thick time T2 is 65 seconds, first time, unloading time T3 was 25 seconds, first time, unloading time T4 was 15 seconds, first time, unloading time T5 was 10 seconds, first time, unloading time T6 was 3 seconds,
11, after solidification element plate obtained for step 10 being cooled 48 hours naturally, carry out the fixed thick process of surperficial sawing sanding, obtain the grass tree structural slab of the application.
Above-mentioned straw raw material comprise in wheat straw, straw, cornstalk, sorghum stalk, reed stalk, cotton stalk, hemp stalk, Sunflower Stalk, beans stalk any one or multiple.
The thickness on described upper and lower top layer is 1 ~ 50mm, and the thickness of core layer is 3 ~ 300mm.
By stalk to be the upper layer made of raw material and branch bavin be embryonic plate that oriented shaving core layer that raw material is made forms, combine up and down through precompressed, and by once hot-forming.
A kind of grass tree structural slab, is characterized in that: it adopts above-mentioned manufacturing technique method to obtain.
Adopt grass tree structural slab of the present invention and production technology thereof, there is following beneficial effect:
1) discarded object produced in agricultural production process is taken full advantage of, straw, straw, cornstalk, the crop stalks such as sorghum stalk, and production and construction, branch bavin wooden waste discarded in the process that renovates is raw material, utilize the novel artificial sheet material that brand-new production technology is made, with alternative traditional solid wood products, can be widely used in architectural engineering and do in not load-bearing, Side fascia, ceiling, floor, roofing roof boarding, sound panel, PLASTIC LAMINATED, ventilating duct and prefabricated house, building template and car, ship shifting board, packaging material and fixed furniture material etc.Both protect wildwood resource, met the demand of economic development to Wood products, solve the place to go of agricultural production wastes straw simultaneously, thus the effect of improving the ecological environment.China produces stalk more than 700,000,000 ton per year, by adopting this explained hereafter straw particieboard, straw and branch bavin is turned waste into wealth, drastically increase the value of crop stalk, meanwhile, significantly reduce again the production cost of sheet material, there is great economic benefit and social value.
2) production efficiency is high, fiber quality is secure, the sheet material quality of production is stablized, by straw raw material being cut into the section of 8 ~ 20cm, be ground into the strip section of 1 ~ 2cm again, not only effectively improve segment and control water drying efficiency, and effectively improve efficiency and the quality of extra-milled fibre, 30 ~ 40 order tenacity of fibre of moisture 3% are strong, and tensile strength comparatively can improve 10 ~ 20 times under the sufficient or bone dry state of moisture.
3) the present invention when producing by stalk fibre directly and oriented wood chipboard combine up and down, once hot-forming, technique is simple, efficiently solve existing oriented wood chipboard and superpose gap and the plate surface caused has uneven because having between wood chip with wood chip, the drawback problem of producing surface decorating plate can not be directly used in, the present invention simultaneously also a saving the raw material resources of the operation loss of the fixed thick sanding in surface of oriented wood chipboard, effectively reduces production cost, enhances productivity.
4) the application adopts 30 ~ 40 object straw fibers, by the control of applying glue ratio and water content, adopt the mode of exerting pressure that precompressed and hot pressing combine simultaneously, and pass through hot pressing temperature, pressure, guarantor's release time controling, fiber sizing and applying glue wood chip are activated diffusion, there is creep, the moisture of fiber dash board layer and wood shavings core layer is constantly evaporated, reach fiber dash board layer and wood shavings core layer is all compacted closely knit, meanwhile, realize fiber dash board layer to be connected with the closely reliable one between wood shavings core layer.The density of fiber dash board layer and wood shavings core layer can reach 0.8g/cm respectively
3with 0.78 g/cm
3the MOR of sheet material effectively can reach 35.4MPa, the application is through repeatedly verifying employing 30 ~ 40 object straw fiber, effectively can utilize the water resistance of the vegetable wax shell in stalk fibre, bonding strength and fiber water resistance can reach optimum state, and within 36 hours, thickness swelling rate is less than 2%.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described further:
Fig. 1 is process chart of the present invention;
Fig. 2 is the structural representation of grass tree structural slab of the present invention;
Fig. 3 is thermal buckling line chart of the present invention.
Detailed description of the invention
Embodiment one
As Figure 1-3: a kind of grass tree structural slab, comprise lowermost fibre dash board layer 3, middle multilayered wood oriented shaving core layer 2 and top fiber dash board layer 1 successively, described lowermost fibre dash board layer 3, middle multilayered wood oriented shaving core layer 2 and top fiber dash board layer 1 one are compressing.Its production technology, comprises the steps:
1, any one or multiple straw raw material in wheat straw, straw, cornstalk, sorghum stalk, reed stalk, cotton stalk, hemp stalk, Sunflower Stalk, beans stalk block after into 8cm length through segment cutter, enter again broken operation, when adopting multiple kinds of crops straw, its mixed proportion can be arbitrary proportion.
2, the straw raw material section of 8cm enters drying process after the strip section that desintegrator is ground into 1cm, is pulverized by abundant segment, effectively improves control water drying efficiency, and effectively improves efficiency and the quality of extra-milled fibre.
3, the straw raw material being ground into 1cm is dry through drying machine, is controlled by moisture 3%; By the control to the straw raw material moisture after pulverizing, the toughness of effective raising straw fiber and tensile strength, avoid straw fiber to rupture on the one hand, improves the effective rate of utilization of straw fiber, improve straw fiber quality on the other hand, thus effectively improve the total quality of final sheet material.
4, the straw raw material after step 3 drying control water, through refiner, carries out cold grinding at normal temperatures and obtains 30 ~ 40 object fibers; Straw fiber under this order number, quick active when effectively can improve compacting spreads and creep efficiency, thus effectively improves hot pressing efficiency and sheet material compacting quality, and the density of sheet material also realizes effective raising.
5, fiber separation, sends qualified fiber into feed bin, and undesirable fiber turns back to precision grinding process secondary fine grinding, follows with one's eyes into feed bin until fiber reaches 30 ~ 40; Strict control fiber order number, the stability of effectively improving the quality of products, and fully refined by straw raw material, effectively improve raw material availability.
6, qualified fiber sends into glue mixer glue mixing through feed bin, applies adhesive, obtain glue mixing fiber by the resin added of 65kg/m3; The resin added of fiber is strict controlled in 65 kg/m3, the overall performance quality of the fibrolaminar pressed density of effective guarantee, creep effect and sheet material, avoids causing fibrolaminar internal bond strength to reduce, and density reduces, the problems such as press time prolongation.
7, branch bavin is after rectangular chipper according to a conventional method flaking, enters drying machine, makes its moisture content 3% after drying, and then in the ratio applying glue of 1m3 wood chip 50kg adhesive, after applying glue, moisture control is between 8%, obtains applying glue wood chip; By controlling the moisture content of resin added, thus combine with follow-up suppression process, the bond strength of effective guarantee core layer and fiber sheath, improves board quality.
8, following table flaggy, core layer, upper dash board layer is overlay successively, the glue mixing fiber that upper and lower dash board layer is obtained by step 6 is determined thickness through spreading machine and is determined weight and mat formation, the applying glue wood chip that core layer is obtained by step 7 is mated formation through spreading machine, and upper and lower dash board layer thickness is 2mm, and core layer thickness is 5mm;
9, slab step 8 paved is through preformer precompressed, and precompressed pressurization oil cylinder working-pressure is between 12Mpa, and compression ratio is at 6:1; By precompressed, slab thickness is compressed to 1/6th volumes, make fiber and wood chip form pre-tightening effect, discharge the additional air such as bubble, and fiber is evenly distributed, for follow-up in hot pressing, the diffusion creep of raw material is prepared, to improve hot pressing efficiency.
10, slab after precompressed enters HTHP press, through hot-press solidifying process, plain plate must be solidified, wherein, platen temperature is 180 DEG C, first peak pressure P 1 limit value is 135kgf/cm2, low-pressure pressure retaining pressure is P2/P3 is 25 ~ 45 kgf/cm2, high pressure dwell pressure is P4/P5 is 90 ~ 115 kgf/cm2, first time off-load keeps pressure P 6 to be 60kgf/cm2, second time off-load keeps pressure P 7 to be 40 kgf/cm2, third time off-load keeps pressure P 8 to be 25 kgf/cm2, 4th off-load keeps pressure P 9 to be 15kgf/cm2, main pressure time T1 is 120 seconds, fixed thick time T2 is 65 seconds, first time, unloading time T3 was 25 seconds, first time, unloading time T4 was 15 seconds, first time, unloading time T5 was 10 seconds, first time, unloading time T6 was 3 seconds, the 1st stage in hot press period, slab upper, first lower fiber sheath plate temperature raises and carries out moisture evaporation, 2nd stage, core layer enters moisture evaporation stage, 3rd stage, namely first peak pressure P 1 is being reached and after the low-pressure pressure retaining stage, within the T1 time period, the moisture rapid, high volume evaporation of slab, about evaporate the moisture of 50 ~ 70%, applying glue is solidified gradually, fiber and wood chip enter the diffusion creep stage fast, simultaneously, sheet material basic forming, the follow-up the 4th, 5, 6, 7, 8 stages, adopt T2 respectively, T3, T4, T5, the time ascending order that T6 is different is carried out repeatedly in off-load pressure maintaining period, slab inside continues diffusion creep and moisture evaporation occur, until diffusion creep completes after the complete release of the 9th stage, slab solidification is shaped.
11, after solidification element plate obtained for step 10 being cooled 48 hours naturally, carry out the fixed thick process of surperficial sawing sanding, obtain the grass tree structural slab of the application.
Through the plain plate of hot-press solidifying through 48 hours natural cooling cycles, in cooling procedure, residual moisture evaporates completely, colloid is solidified completely, then by saw limit, and enter sand-lime light by health dolly and carry out the fixed thick process of sanding surface, obtain the grass tree structural slab of the application.
Adopt the grass tree structural slab of production technology production same model of the present embodiment and draw samples is tested, its assay is as follows:
| Fibrage density (g/cm 3） | Core layer density (g/cm 3） | MOR (MPa) | 36 hours thickness swelling rates (%) | |
| Sample 1 | 0.79 | 0.77 | 35.3 | 1.5 |
| Sample 2 | 0.8 | 0.77 | 35.2 | 1.3 |
| Sample 3 | 0.8 | 0.78 | 35.4 | 1.2 |
Embodiment two
The difference of the present embodiment and embodiment one is: in the step 1 in its production technology, and straw raw material is through blocking as 12cm is long;
In step 2, broken length is 1.5cm again;
Applying glue to fibers ratio in step 6 is 80kg/m3;
In step 7, dried water content is 4%, and wood chip applying glue ratio is 55kg adhesive/1m3 wood chip, and the moisture control after applying glue is 10%;
In step 8, upper and lower dash board layer thickness is 30mm, and core layer thickness is 200mm;
Step 9 adopts the pressure of 10Mpa to carry out precompressed;
In step 10, the temperature of platen controls at 190 DEG C.
Adopt the grass tree structural slab of production technology production same model of the present embodiment and draw samples is tested, its assay is as follows:
| Fibrage density (g/cm 3） | Core layer density (g/cm 3） | MOR (MPa) | 36 hours thickness swelling rates (%) | |
| Sample 1 | 0.79 | 0.77 | 35.3 | 1.6 |
| Sample 2 | 0.79 | 0.76 | 35.2 | 1.8 |
| Sample 3 | 0.79 | 0.77 | 35.2 | 1.75 |
Embodiment three
The difference of the present embodiment and embodiment one or two is: in the step 1 in its production technology, and straw raw material is through blocking as 20cm is long;
In step 2, broken length is 2cm again;
Applying glue to fibers ratio in step 6 is 90kg/m3;
In step 7, dried water content is 5%, and wood chip applying glue ratio is 60kg adhesive/1m3 wood chip, and the moisture control after applying glue is 12%;
In step 8, upper and lower dash board layer thickness is 50mm, and core layer thickness is 300mm;
Step 9 adopts the pressure of 12Mpa to carry out precompressed;
In step 10, the temperature of platen controls at 200 DEG C.
Adopt the grass tree structural slab of production technology production same model of the present embodiment and draw samples is tested, its assay is as follows:
| Fibrage density (g/cm 3） | Core layer density (g/cm 3） | MOR (MPa) | 36 hours thickness swelling rates (%) | |
| Sample 1 | 0.79 | 0.78 | 35 | 2 |
| Sample 2 | 0.79 | 0.78 | 35.4 | 1.8 |
| Sample 3 | 0.8 | 0.78 | 35.2 | 1.75 |
Grass tree structural slab of the present invention, production technology is simple, cost is low, efficiency is high, steady quality, and compact structure, expansion rate of water absorption are low and MOR is high.
Technical scheme of the present invention is not restricted in the scope of embodiment of the present invention.The technology contents of the not detailed description of the present invention is known technology.
Claims (5)
1. a grass tree structural slab production technology, is characterized in that: it comprises the steps:
Step 1, straw raw material through segment cutter block be 8 ~ 20cm length after, enter again broken operation;
Step 2, straw raw material section enter drying process after the strip section that desintegrator is ground into 1 ~ 2cm;
The straw raw material of step 3, more broken mistake is dry through drying machine, and moisture controls 3%;
Step 4, dried straw raw material, through refiner, carry out cold grinding at normal temperatures and obtain 30 ~ 40 object fibers;
Step 5, fiber separation, send qualified fiber into feed bin, and underproof fiber turns back to precision grinding process secondary fine grinding, follows with one's eyes into feed bin until fiber reaches 30 ~ 40;
Step 6, qualified fiber send into glue mixer glue mixing through feed bin, apply adhesive, obtain glue mixing fiber by the resin added of 65 ~ 90kg/m3;
Step 7, branch bavin, after rectangular chipper flaking, enter drying machine, make its moisture content 3 ~ 5% after drying, and then in the ratio applying glue of 1m3 wood chip 50 ~ 60kg adhesive, after applying glue, moisture control is between 8 ~ 12%, obtains applying glue wood chip;
Step 8, overlay following table flaggy, core layer, upper dash board layer successively, the glue mixing fiber that upper and lower dash board layer is obtained by step 6 is determined thickness through spreading machine and is determined weight and mat formation, and the applying glue wood chip that core layer is obtained by step 7 is mated formation through spreading machine;
Step 9, the slab that step 8 paved are through preformer precompressed, and precompressed pressurization oil cylinder working-pressure is between 7 ~ 12Mpa, and compression ratio is 6:1;
Step 10, slab after precompressed enters HTHP press, through hot-press solidifying process, plain plate must be solidified, wherein, platen temperature is at 180 DEG C ~ 200 DEG C, first peak pressure P 1 limit value is 135kgf/cm2, low-pressure pressure retaining pressure is P2/P3 is 25 ~ 45 kgf/cm2, high pressure dwell pressure is P4/P5 is 90 ~ 115 kgf/cm2, first time off-load keeps pressure P 6 to be 60kgf/cm2, second time off-load keeps pressure P 7 to be 40 kgf/cm2, third time off-load keeps pressure P 8 to be 25 kgf/cm2, 4th off-load keeps pressure P 9 to be 15kgf/cm2, main pressure time T1 is 120 seconds, fixed thick time T2 is 65 seconds, first time, unloading time T3 was 25 seconds, first time, unloading time T4 was 15 seconds, first time, unloading time T5 was 10 seconds, first time, unloading time T6 was 3 seconds,
After step 11, solidification element plate step 10 obtained cool 48 hours naturally, carry out the fixed thick process of surperficial sawing sanding, obtain the grass tree structural slab of the application.
2. grass tree structural slab production technology as claimed in claim 1, is characterized in that: above-mentioned straw raw material comprises
In wheat straw, straw, cornstalk, sorghum stalk, cotton stalk, hemp stalk, reed stalk, Sunflower Stalk, beans stalk any one or multiple.
3. grass tree structural slab production technology as claimed in claim 1, it is characterized in that: the thickness on described upper and lower top layer is 1 ~ 50mm, the thickness of core layer is 3 ~ 300mm.
4. grass tree structural slab production technology as claimed in claim 1, it is characterized in that: by stalk to be the upper layer made of raw material and branch bavin be embryonic plate that oriented shaving core layer that raw material is made forms, combine up and down through precompressed, and by once hot-forming.
5. a grass tree structural slab, is characterized in that: it adopts the manufacturing technique method described in above-mentioned any one claim to obtain.
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| CN109049171A (en) * | 2018-07-27 | 2018-12-21 | 绍兴臣工新材料科技有限公司 | A kind of orientation wheat straw board and preparation method thereof |
| CN109227866A (en) * | 2018-09-06 | 2019-01-18 | 余姚市合丰厨具有限公司 | A kind of reed plate of high intensity |
| CN110802687A (en) * | 2019-11-12 | 2020-02-18 | 青岛燕如峰科技有限公司 | Preparation method of composite cereal fragrant board containing negative ions |
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| CN104960066B (en) | 2017-09-22 |
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