CN107932673B - Manufacturing method of straw shaving board and straw shaving board - Google Patents
Manufacturing method of straw shaving board and straw shaving board Download PDFInfo
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- CN107932673B CN107932673B CN201711210425.5A CN201711210425A CN107932673B CN 107932673 B CN107932673 B CN 107932673B CN 201711210425 A CN201711210425 A CN 201711210425A CN 107932673 B CN107932673 B CN 107932673B
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- 238000012216 screening Methods 0.000 claims abstract description 45
- 239000012792 core layer Substances 0.000 claims abstract description 36
- 239000002344 surface layer Substances 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 7
- 238000004513 sizing Methods 0.000 claims description 29
- 239000003292 glue Substances 0.000 claims description 28
- 239000012948 isocyanate Substances 0.000 claims description 22
- 150000002513 isocyanates Chemical class 0.000 claims description 21
- 238000007670 refining Methods 0.000 claims description 16
- 239000000853 adhesive Substances 0.000 claims description 15
- 230000001070 adhesive effect Effects 0.000 claims description 15
- 238000000926 separation method Methods 0.000 claims description 13
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- 238000000227 grinding Methods 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 9
- 238000007731 hot pressing Methods 0.000 claims description 8
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- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 claims description 6
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
- B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
- B27L11/02—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood shavings or the like
-
- 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
- B27N1/00—Pretreatment of moulding material
- B27N1/02—Mixing the material with binding agent
-
- 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
- B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Mechanical Engineering (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention provides a method for manufacturing a straw particle board, which comprises the following steps: the method comprises the following steps of preparing straw shavings, screening the straw shavings, treating straw coarse materials, preparing the wood shavings, screening the wood shavings, treating the wood coarse materials, preparing surface layer materials, preparing core layer materials and preparing straw particle boards. In the step of processing the coarse wood materials, thinning the coarse wood materials by using thinning equipment, and conveying the thinned coarse wood materials and the wood shavings to the second screening equipment together so as to further screen the thinned coarse wood materials into the coarse wood materials and the qualified straw materials. The invention also provides the straw particle board manufactured by the manufacturing method.
Description
Technical Field
The invention relates to the field of shaving board manufacturing, in particular to a manufacturing method of a straw shaving board mixed by straws and wood shavings and the straw shaving board manufactured by the manufacturing method.
Background
At present, the manufacture of shaving boards in China still mainly takes wood as raw material. After natural forest protection engineering and wood cutting limitation are implemented in China, a plurality of shaving board manufacturing enterprises are trapped in the predicament of wood resource shortage.
The crop straw is a precious renewable resource, and the annual crop straw yield of China is about 7 hundred million tons. However, due to the influence of factors such as consumption concept and life style, the straw resources in China are in the conditions of high consumption, high pollution and low yield for a long time, and a considerable part of crop straws are discarded or incinerated and are not reasonably developed and utilized. In recent years, the research on the comprehensive utilization of crop straws (such as rice, wheat, soybean, cotton, flax and other crop straws) is increasingly emphasized, and the pressing of the straws after a series of complex industrial treatments into boards is one of important research directions.
However, the conventional straw particle board production line has some problems, for example, the produced straw particle board only contains straw particles, and cannot meet the national standard of the straw particle board. The particle size distribution of the straw wood shavings hammered by the hammer crusher is wide, and the requirements of the surface core layer of the straw wood shavings plate on different fiber fineness are not met. In some conventional production lines, even if the surface core layer is individually crushed, some coarse material may still be present on the surface of the sheet, thereby affecting the application of the veneer of the sheet; meanwhile, considerable coarse materials may be contained in the core layer, which affects the strength of the manufactured straw particle board. In addition, the quality of surface materials can be improved by reducing the aperture of the screen mesh, but the fine screen mesh increases the crushing difficulty, and particularly, the yield is low easily, the equipment faults are frequent and the productivity of a straw particle board production line is severely restricted under the condition that the moisture content of straws cannot be guaranteed.
Therefore, there is a need to provide a new straw particle board and a manufacturing method thereof to solve the above problems.
Disclosure of Invention
In order to solve at least one aspect of the above technical problems, embodiments of the present invention provide a method of manufacturing a straw particle board and a straw particle board manufactured using the same.
According to an aspect of the present invention, there is provided a method of manufacturing a straw particle board, the method comprising the steps of:
preparing straw wood shavings: cutting, drying and crushing the straws to prepare straw shavings;
screening the straw shavings: conveying the straw shavings to a first screening device to screen the straw shavings into straw coarse materials and straw qualified materials;
treating the straw coarse material: refining the straw coarse material by utilizing first refining equipment, and conveying the refined straw coarse material and the straw shavings to the first screening equipment together so as to further screen the refined straw coarse material into straw coarse material and straw qualified material;
preparing wood shavings: chipping and slicing wood to prepare wood shavings;
screening wood shavings: conveying the wood shavings to a second screening device to screen the wood shavings into coarse wood materials and qualified wood materials;
treating the coarse wood materials: refining the coarse wood materials by using second refining equipment, and conveying the refined coarse wood materials and the wood shavings to the second screening equipment together so as to further screen the refined coarse wood materials into coarse wood materials and qualified straw materials;
preparing a surface material: preparing a surface layer material from the qualified straw material;
preparing a core layer material: preparing a core layer material from the qualified wood material; and
preparing a straw particle board: and (3) paving, prepressing, hot-pressing and post-treating the surface layer material and the core layer material to obtain the straw particle board.
Optionally, the preparing the surface material from the straw qualified material comprises:
conveying the qualified straw material to a first airflow sorting device for airflow sorting; and
sizing the straw qualified material subjected to air flow sorting to prepare the surface layer material, and/or preparing the core layer material from the wood qualified material comprises the following steps:
conveying the qualified wood materials to a second airflow separation device for airflow separation; and
and sizing the qualified wood material subjected to air flow separation to prepare the core layer material.
Optionally, the first screening device comprises a first square-hole screen, and the first square-hole screen screens the straw shavings into straw coarse materials and straw qualified materials.
For example, the first square mesh sieve has a mesh diameter in the range of 1.3mm × 1.3mm to 2.8mm × 2.8 mm.
Optionally, the second screening device comprises a second square-hole screen or a bar screen, and the second square-hole screen or the bar screen screens the wood shavings into coarse wood materials and qualified wood materials.
For example, the mesh diameter of the second square-hole sieve is in the range of 8mm × 8mm to 12mm × 12mm, and the mesh diameter of the bar-shaped sieve is in the range of 3mm × 30mm to 4mm × 40 mm.
For example, in the sizing step, the applied adhesive comprises an isocyanate glue.
Optionally, in the step of sizing the qualified straw material subjected to air flow sorting to prepare the surface layer material, the application amount of the isocyanate glue is 3.5-5.0% of the weight of the qualified straw material to be sized;
and/or in the step of sizing the qualified wood material subjected to air flow separation to prepare the core layer material, the application amount of the isocyanate glue is 3.8-4.5% of the weight of the qualified wood material to be sized.
Optionally, the straw particle board is prepared by the following steps:
dividing the surface material into an upper surface material and a lower surface material;
sequentially paving the lower surface layer material, the core layer material and the upper surface layer material to obtain a plate blank;
pre-pressing the plate blank; and
and hot-pressing the slab.
Optionally, the manufacturing method further comprises: drying the strands of wood prior to conveying the strands of wood to a second screening apparatus.
For example, the straw includes at least one of rice straw, wheat straw, soybean straw, cotton straw, and hemp straw.
According to another aspect of the present invention, there is also provided a straw particle board manufactured according to any one of the above manufacturing methods.
According to yet another aspect of the present invention, there is also provided a straw particle board, comprising:
an upper surface layer comprising straw shavings and isocyanate glue;
a core layer comprising wood strands and an isocyanate glue; and
a lower surface layer comprising straw shavings and isocyanate glue.
Compared with the prior art, the invention has at least one of the following beneficial effects:
(1) screening the crushed straw shavings, wherein only the screened qualified straw materials can be used as surface layer materials, and thick materials can be prevented from appearing on the surface of the plate, so that the veneer application of the plate can be improved;
(2) the grinding process is added, the thick straw material can be changed into qualified straw material through grinding, and the utilization rate of the straw raw material is improved;
(3) the wood shavings are also screened, only the screened qualified wood materials can be used as core layer materials, and excessive coarse materials can be prevented from being contained in the core layer, so that the strength of the manufactured shaving board can meet the requirement of national standard;
(4) and a re-crushing process is added, so that the coarse wood materials can be changed into qualified wood materials through the re-crushing process, and the utilization rate of the wood raw materials is improved.
Drawings
Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.
Fig. 1 is a process flow diagram of a method of manufacturing a straw particle board according to an exemplary embodiment of the present invention; and
fig. 2 is a schematic structural view of a straw particle board manufactured by a manufacturing method according to an embodiment of the present invention.
It is noted that the drawings are not necessarily to scale and are merely illustrative in nature and not intended to obscure the reader.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention. It should be apparent that the described embodiment is one embodiment of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
As used herein, the expression "particle board" refers to a type of artificial board made by processing wood or non-wood plant fiber raw materials into shavings (or particles), applying adhesives (and/or other additives), assembling, shaping, and hot pressing.
The expression "straw" is a generic term for the stem and leaf (ear) part of a mature crop, which may include, for example, the remainder of wheat, rice, corn, potatoes, oilseed rape, cotton, sugar cane and other crops (typically roughage) after harvesting the seed. For example, herein, the straw may include at least one of rice straw, wheat straw, soybean straw, cotton straw, and hemp straw. As another example, the hemp straw can include hemp straw, flax straw, hemp straw, and the like.
The expression "wood shavings" is intended to mean pieces of wood or non-wood raw material, machined, in the form of pieces, strips, rods and/or granules, having a certain shape and size.
The expressions "coarse" or "coarse", "accept", "fines" primarily divide the strands according to their dimensions, and it will be understood by those skilled in the art that they refer to the relative sizes of the strands, i.e., the strands of "coarse" or "coarse" are larger in size, the strands of "accept" are intermediate in size, and the strands of "fines" are smaller in size. The sizes of the shavings for dividing into coarse materials, qualified materials and fine materials can be different according to different actual purposes or application occasions. For example, the dimensions of the strands of "coarse" or "coarse", "accept" and "fines" used in the surface layers of a particle board differ from the dimensions of the strands of "coarse" or "coarse", "accept" and "fines", respectively, used in the core layer of a particle board.
According to an exemplary embodiment of the present invention, there is provided a method of manufacturing a straw particle board, which may include the steps of:
preparing straw wood shavings: cutting, drying and crushing the straws to prepare straw shavings;
screening the straw shavings: conveying the straw shavings to a first screening device to screen the straw shavings into straw coarse materials and straw qualified materials;
treating the straw coarse material: refining the straw coarse material by utilizing first refining equipment, and conveying the refined straw coarse material and the straw shavings to the first screening equipment together so as to further screen the refined straw coarse material into straw coarse material and straw qualified material;
preparing wood shavings: chipping and slicing wood to prepare wood shavings;
screening wood shavings: conveying the wood shavings to a second screening device to screen the wood shavings into coarse wood materials and qualified wood materials;
treating the coarse wood materials: refining the coarse wood materials by using second refining equipment, and conveying the refined coarse wood materials and the wood shavings to the second screening equipment together so as to further screen the refined coarse wood materials into coarse wood materials and qualified straw materials;
preparing a surface material: preparing a surface layer material from the qualified straw material;
preparing a core layer material: preparing a core layer material from the qualified wood material; and
preparing a straw particle board: and (3) paving, prepressing, hot-pressing and post-treating the surface layer material and the core layer material to obtain the straw particle board.
The above manufacturing method may have at least one of the following advantageous effects:
(1) screening the crushed straw shavings, wherein only the screened qualified straw materials can be used as surface layer materials, and thick materials can be prevented from appearing on the surface of the plate, so that the veneer application of the plate can be improved;
(2) the grinding process is added, the thick straw material can be changed into qualified straw material through grinding, and the utilization rate of the straw raw material is improved;
(3) the wood shavings are also screened, only the screened qualified wood materials can be used as core layer materials, and excessive coarse materials can be prevented from being contained in the core layer, so that the strength of the manufactured shaving board can meet the requirement of national standard;
(4) and a re-crushing process is added, so that the coarse wood materials can be changed into qualified wood materials through the re-crushing process, and the utilization rate of the wood raw materials is improved.
The method for manufacturing the straw particle board according to the embodiment of the invention is further described in detail with reference to fig. 1.
In the manufacturing method according to an embodiment of the present invention, the step of preparing the straw shavings may specifically include the steps of:
cutting off the straws: the method comprises the steps of bundling and unpacking straws, and cutting the straws into a certain length by a straw cutter, for example, into a length of 5-50 mm.
And (3) drying: the roller type dryer is used for removing stones, ash and moisture in the straws, so that the water content of the straws is controlled to be 9-11%. The drum dryer is an internal heating conduction type rotary drying device, and wet materials obtain heat transferred in a heat conduction mode on the outer wall of a drum to remove moisture and achieve the moisture content required by drying.
Crushing: the straws are processed into crushed materials by a hammer mill.
In the manufacturing method according to an embodiment of the present invention, the preparing step of the wood strands may specifically include the steps of:
wood chipping: the wood is processed into chips of a certain size and shape by a chipper.
Slicing: the flaker processes the strands into the desired size and shape.
And (3) drying: and (5) using a dryer to enable the water content of the wood shavings to meet the process requirements.
According to an exemplary embodiment, the manufacturing method further comprises a screening step after the straw strands are produced. In the screening step, the straw shavings are conveyed to a first screening device to screen the straw shavings into straw coarse materials and straw qualified materials. In one example, the first screening apparatus may include a first square mesh screen that screens the straw shavings into straw rag and straw accept. For example, the first square mesh sieve has a mesh diameter in the range of 1.3mm × 1.3mm to 2.8mm × 2.8 mm. For another example, the first square mesh screen may have a mesh size of 2mm × 2 mm. Therefore, with the help of the first square hole sieve, the straw shavings passing through the first square hole sieve can be used as qualified straw materials, and the straw shavings not passing through the first square hole sieve can be used as coarse straw materials. In the example of the first square-hole sieve with the screen mesh diameter of 2mm × 2mm, straw shavings with shavings smaller than 2mm × 2mm can be used as qualified straw material, and the rest of straw shavings can be used as coarse straw material. Through setting up the parameter of first screening installation, can control the wood shavings size of the straw certified material of selecting, the straw certified material of only selecting can be used for the surface course material, can prevent that thick material from appearing on the panel is surperficial to the veneer that can greatly improve panel is used.
According to an exemplary embodiment, the manufacturing method further comprises a step of processing the straw rag. In the step of processing the coarse straw and large material, grinding the coarse straw and large material by using first refining equipment, such as grinding equipment, and conveying the ground coarse straw and large material together with the straw shavings to the first screening equipment so as to further screen the ground coarse straw and large material into coarse straw and qualified straw. In one example, the grinding apparatus may be a screen ring grinder, such as a BX5612 screen ring grinder, to grind the straw grit into finer shavings.
According to an exemplary embodiment, the manufacturing method further comprises a screening step after the wood strands are produced. In the screening step, the wood strands are conveyed to a second screening device to screen the wood strands into coarse wood material and qualified wood material. In one example, the second screening apparatus may include a second square or bar screen that screens the wood strands into wood coarse and wood accepts. For example, the mesh diameter of the second square mesh screen may be in the range of 8mm × 8mm to 12mm × 12mm, and the mesh diameter of the bar screen may be in the range of 3mm × 30mm to 4mm × 40 mm. For another example, the second square mesh screen may have a mesh size of 10mm × 10 mm. In this way, with the aid of the second screening apparatus, wood strands that pass through the second screening apparatus can be used as wood-qualified material, and wood strands that do not pass through the second screening apparatus can be used as coarse wood material. In the example where the second square mesh screen has a mesh size of 10mm x 10mm, wood strands having a strand size of less than 10mm x 10mm may be used as the wood accept, and the remaining wood strands may be used as the wood rough. Through the parameter that sets up the second screening installation, can control the wood shaving size of the timber qualification material of selecting, only the timber qualification material of selecting can be used for the core layer material, can prevent that too much thick material from containing in the core layer to the intensity that can guarantee the straw shaving board that produces satisfies national standard's requirement.
According to an exemplary embodiment, the manufacturing method further comprises a step of processing the wood strands. In the step of processing the coarse wood material, the coarse wood material is reground by using a second refining apparatus, such as a crushing apparatus, and the reground coarse wood material and the wood shavings are conveyed to the second screening apparatus together to further screen the reground coarse wood material into coarse wood material and qualified wood material. In one example, the comminution apparatus may be a mill to comminute the coarse wood particles into finer strands.
According to an exemplary embodiment, as shown in connection with fig. 1, the manufacturing method may further include an air-flow sorting step and a sizing step to prepare the cover stock. In the air flow sorting step, the qualified straw material can be conveyed to a first air flow sorting device for air flow sorting, so that impurities such as stones, straw nodes, soil, iron blocks and the like in the qualified straw material can be removed. In one example, the first airflow separation device may comprise an airflow classifier. In the sizing step, sizing is carried out on the qualified straw material subjected to air flow separation so as to prepare the surface layer material.
According to exemplary embodiments, the manufacturing method may further include an air-flow sorting step and a sizing step to prepare the core material. In the air flow sorting step, the qualified wood materials can be conveyed to a second air flow sorting device for air flow sorting, so that impurities such as stones, wood nodes, soil, iron blocks and the like in the qualified wood materials can be removed. In one example, the second air flow sorting apparatus may comprise an air flow sorter. In the sizing step, sizing is performed on the wood qualified material subjected to air flow sorting to prepare the core material.
According to exemplary embodiments, in the above sizing step, the applied adhesive may comprise an isocyanate glue, such as an MDI isocyanate glue.
For example, the manufacturing method of the straw particle board can specifically comprise the following steps:
sizing a surface material: quantitatively inputting the qualified straw material into a surface sizing system, and applying an adhesive according to a preset sizing proportion to obtain sized straw wood shavings. In an exemplary embodiment of the present invention, the applied adhesive is an isocyanate glue, such as MDI glue, which ensures zero formaldehyde emission from the manufactured straw particle board since it is an aldehyde-free glue. As an example, the qualified straw material can be metered by a belt metering conveyor, and the automatic and accurate supply of the adhesive is completed by a PLC control center, so that the qualified straw material is uniformly mixed with the adhesive thrown out by a centrifugal atomizer rotating at a high speed in a closed roller. For example, the application amount of the isocyanate glue is 3.5-5.0% of the weight of the qualified straw material to be glued.
Material distribution: and equally dividing the straw qualified material uniformly glued into an upper surface material and a lower surface material by using a distributor.
Sizing the core layer material: and (4) inputting the qualified wood material into a core layer sizing system for sizing. As an example, the qualified wood materials can be metered by a belt metering conveyor, and the automatic and accurate supply of the adhesive is completed by a PLC control center, so that the qualified wood materials are uniformly mixed with the adhesive thrown out by a centrifugal atomizer rotating at a high speed in a closed roller. The adhesive can also be isocyanate glue, such as MDI glue, for example, the application amount of the isocyanate glue can be 3.8-4.5% of the weight of the qualified wood material to be glued.
According to an example of the present invention, if the sizing amount of the core material is represented by a and the sizing amount of the skin material is represented by B, the sizing amount of the core material is 0.5 to 1% less than that of B, that is, the value of (B-a) is in the range of 0.5 to 1.
The inventor finds that the qualified straw materials and qualified wood materials meeting the size requirements can be used as the surface layer and the core layer only by strictly controlling the qualified straw materials and the qualified wood materials, so that the application amount of the isocyanate glue can be controlled within the ranges of 3.5-5.0% (surface layer) and 3.8-4.5% (core layer), namely, the application amount of the isocyanate glue is greatly reduced, and the manufacturing cost of the straw particle board can be reduced.
Paving: and paving the straw qualified material (as a lower surface layer material), the wood qualified material (as a core layer material) and the straw qualified material (as an upper surface layer material) which are subjected to glue application into a plate blank with a three-layer symmetrical structure by using a paving machine.
Pre-pressing: the plate blank is pre-pressed by a pre-pressing machine to keep a certain shape. The slab pre-compression ratio is controlled to be 45%, and the rebound resilience is controlled to be 20%. In order to prevent sticking, the surfaces of the pressing plate and the backing plate should be regularly and uniformly coated with the parting medium.
Hot pressing: the plate blank is heated and pressurized by a press, so that water in the plate raw materials and isocyanate of the adhesive generate complex chemical reaction, and the plate raw materials are bonded together by the reaction product. In order to prevent the press plate from sticking, the upper press plate layer should be coated with a uniform release agent.
And (3) post-treatment: and (3) carrying out post-treatment procedures such as plate cooling, edge cutting, cooling, homogenizing, sanding and the like on the pressed rough boards to obtain the straw particle board.
Further, the whole process of manufacturing the straw particle board using the above manufacturing method is described below with reference to specific examples.
(1) And cutting the rice straws into straw sections of 20-40 mm by using a straw cutter.
(2) The straw sections are uniformly dried by adopting a roller type airflow dryer with an impurity removal device, so that the moisture content of the straw sections is reduced to 12-13%, and meanwhile, impurities such as stones, soil, iron blocks and the like are removed, so that the impurities are prevented from entering the next crushing process.
Wherein, drying system can directly use the air, and the heat exchanger adopts shell and tube heat exchanger, and exhaust emission and recycling proportion are 1: 1, the temperature of air entering a dryer is 180 ℃, a 25mm square hole screen is adopted as a dryer screen, the air speed of an air conveying pipeline is 20m/s, a primary cyclone separator is adopted to treat tail gas, and a bag-type dust collector is adopted for tail gas discharge.
(3) The grass pieces were crushed using a 2 x 132kw twin-shaft hammer mill.
(4) And screening the crushed straw shavings into straw coarse materials and straw qualified materials by adopting a square-hole screen with the screen mesh diameter of 2mm multiplied by 2 mm.
(5) And grinding the coarse straw and large material by using a BX5612 type sieve ring type grinding machine, conveying the ground coarse straw and the ground straw shavings to the 2mm multiplied by 2mm square-hole sieve together, and further sieving the ground coarse straw and large material into coarse straw and large material and qualified straw.
(6) The wood is chipped and sliced using a chipper and a flaker to produce wood strands.
(7) And conveying the wood shavings to a square-hole sieve with the mesh size of 10mm multiplied by 10mm so as to sieve the wood shavings into wood coarse materials and wood qualified materials.
(8) And crushing the wood coarse and large materials by using a crusher, conveying the crushed wood coarse and large materials and the wood shavings to a square-hole sieve with the sieve mesh aperture of 10mm multiplied by 10mm, and further sieving the crushed wood coarse and large materials into the wood coarse and large materials and straw qualified materials.
(9) And conveying the qualified straw materials to an air flow separator for air flow separation, and removing impurities such as stones, straw nodes, soil, iron blocks and the like in the qualified straw materials.
(10) And conveying the qualified wood materials to an airflow separator for airflow separation, and removing impurities such as stones, wood nodes, soil, iron blocks and the like in the qualified wood materials.
(11) Quantitatively inputting the qualified straw material into a surface sizing system, wherein the applied adhesive is MDI glue, and the application amount of the MDI glue is 4% of the weight of the qualified straw material to be sized.
(12) Material distribution: and equally dividing the straw qualified material uniformly glued into an upper surface material and a lower surface material by using a distributor.
(13) And (4) inputting the qualified wood material into a core layer sizing system for sizing. The applied adhesive was MDI glue applied in an amount of 4.0% by weight of the wood standard to be glued.
(14) Paving: and paving the straw qualified material (as a lower surface layer material), the wood qualified material (as a core layer material) and the straw qualified material (as an upper surface layer material) which are subjected to glue application into a plate blank with a three-layer symmetrical structure by using a paving machine.
(15) Pre-pressing: the plate blank is pre-pressed by a pre-pressing machine to keep a certain shape. The slab pre-compression ratio is controlled to be 45%, and the rebound resilience is controlled to be 20%.
(16) Hot pressing: the plate blank is heated and pressurized by a press, so that water in the plate raw materials and isocyanate of the adhesive generate complex chemical reaction, and the plate raw materials are bonded together by the reaction product.
(17) And (3) post-treatment: and (3) carrying out post-treatment procedures such as plate cooling, edge cutting, cooling, homogenizing, sanding and the like on the pressed rough boards to obtain the straw particle board.
According to the requirements of national standard GB/T4897-2015 of particle boards; according to the test method for the physical and chemical properties of the artificial board and the veneer artificial board GB/T17657-2013, the physical and chemical property indexes manufactured by the exemplary manufacturing method are as follows:
thickness: 18mm
Density: 710kg/m3
Internal bonding strength: 0.55MPa
Table bond strength: 1.22MPa
Static bending strength: 19.7MPa
Modulus of elasticity: 2180MPa
Screw holding force: 1210N plate surface and 750N plate edge
Water absorption thickness expansion rate of 2 h: 1.86 percent
Formaldehyde emission: not measured out
As can be seen from the measured physical and chemical performance indexes, the physical and chemical performance indexes of the straw particle board manufactured by the manufacturing method according to the embodiment of the invention meet the requirements of national standards, and most physical and chemical performance indexes (such as bonding strength) are greatly higher than the national standards.
According to an exemplary embodiment of the present invention, there is provided a straw particle board, as shown in fig. 2, which may include: an upper surface layer 21 comprising straw shavings and isocyanate glue; a core layer 22 comprising wood strands and an isocyanate glue; and a lower surface layer 23 comprising straw shavings and isocyanate glue. The straw particle board may be a straw particle board manufactured according to the manufacturing method of the embodiment shown in fig. 1.
In one example, the strands of the straw strands may be less than 2mm by 2mm in size and the strands of the wood strands may be less than 10mm by 10mm in size.
It should also be noted that, in the case of the embodiments of the present invention, features of the embodiments and examples may be combined with each other to obtain a new embodiment without conflict.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention is subject to the scope of the claims.
Claims (8)
1. A manufacturing method of straw particle boards is characterized by comprising the following steps:
preparing straw wood shavings: cutting and drying the straws, and processing the straws into crushed materials by a hammer mill to prepare straw shavings;
screening the straw shavings: conveying the straw shavings to a first screening device to screen the straw shavings into straw coarse materials and straw qualified materials;
treating the straw coarse material: refining the straw coarse material by utilizing first refining equipment, and conveying the refined straw coarse material and the straw shavings to the first screening equipment together so as to further screen the refined straw coarse material into straw coarse material and straw qualified material;
preparing wood shavings: chipping and slicing wood to prepare wood shavings;
screening wood shavings: conveying the wood shavings to a second screening device to screen the wood shavings into coarse wood materials and qualified wood materials;
treating the coarse wood materials: refining the coarse wood materials by using second refining equipment, and conveying the refined coarse wood materials and the wood shavings to the second screening equipment together so as to further screen the refined coarse wood materials into coarse wood materials and qualified wood materials;
preparing a surface material: preparing a surface layer material from the qualified straw material;
preparing a core layer material: preparing a core layer material from the qualified wood material; and
preparing a straw particle board: using the surface layer material and the core layer material to prepare the straw particle board through the steps of paving, prepressing, hot pressing and post-treatment;
wherein the first refining equipment is a sieve ring type grinding machine; the second refining equipment is a pulverizer;
the first screening device is a first square-hole screen, and the first square-hole screen screens the straw shavings into straw coarse materials and straw qualified materials; the aperture of the screen mesh of the first square-hole screen is in the range of 1.3mm multiplied by 1.3mm to 2.8mm multiplied by 2.8 mm;
the second screening device is a second square-hole screen or a bar-shaped screen, and the second square-hole screen or the bar-shaped screen screens the wood shavings into coarse wood materials and qualified wood materials; the screen mesh diameter of the second square-hole screen is in the range of 8mm multiplied by 8 mm-12 mm multiplied by 12mm, and the screen mesh diameter of the strip-shaped screen is in the range of 3mm multiplied by 30 mm-4 mm multiplied by 40 mm.
2. The method of manufacturing straw particle board as claimed in claim 1, wherein the preparing of the surface material from the straw qualified material comprises:
conveying the qualified straw material to a first airflow sorting device for airflow sorting; and
sizing the qualified straw material subjected to air flow separation to prepare the surface layer material,
and/or, the preparation of the core material by the wood qualified material comprises the following steps:
conveying the qualified wood materials to a second airflow separation device for airflow separation; and
and sizing the qualified wood material subjected to air flow separation to prepare the core layer material.
3. A method of manufacturing straw particle board as claimed in claim 2, wherein in the sizing step, the applied adhesive comprises an isocyanate glue.
4. The method for manufacturing straw particle board as claimed in claim 3, wherein in the step of sizing the qualified straw material subjected to air flow sorting to prepare the surface material, the amount of isocyanate glue applied is 3.5-5.0% of the weight of the qualified straw material to be sized; and/or in the step of sizing the qualified wood material subjected to air flow separation to prepare the core layer material, the application amount of the isocyanate glue is 3.8-4.5% of the weight of the qualified wood material to be sized.
5. The method of manufacturing straw particle board according to any one of claims 1-4, wherein the step of preparing the straw particle board comprises:
dividing the surface material into an upper surface material and a lower surface material;
sequentially paving the lower surface layer material, the core layer material and the upper surface layer material to obtain a plate blank;
pre-pressing the plate blank; and
and hot-pressing the slab.
6. The method of manufacturing straw particle board of claim 1, further comprising:
drying the strands of wood prior to conveying the strands of wood to a second screening apparatus.
7. The method of manufacturing a straw particle board according to claim 1, wherein the straw comprises at least one of rice straw, wheat straw, soybean straw, cotton straw, and hemp straw.
8. A straw particle board, wherein the straw particle board is manufactured according to the manufacturing method of any one of claims 1 to 7.
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| CN107984592A (en) * | 2017-11-27 | 2018-05-04 | 万华生态板业(信阳)有限公司 | The manufacture method and stalk-shaving board of stalk-shaving board |
| CN109624014A (en) * | 2018-12-29 | 2019-04-16 | 湖南万华生态板业有限公司 | It is a kind of can facing multiple-layered wood chipboard production technology |
| CN110919790B (en) * | 2019-12-24 | 2022-04-12 | 万华禾香板业（公安县）有限责任公司 | Secondary utilization method of straw board reclaimed materials, production method of straw board and equipment |
| CN111605025B (en) * | 2020-05-28 | 2022-06-17 | 万华禾香板业(兰考)有限责任公司 | Shaving board production method and shaving board |
| CN112575916B (en) * | 2020-12-14 | 2021-12-14 | 吉林大学 | Biomass building insulation board made of hemp straws |
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| DE3902023A1 (en) * | 1989-01-20 | 1990-07-26 | Joseph Darma | Building material board made of natural fibres or waste products of plant origin and obtaining the fibres thereof |
| CN1128046C (en) * | 2001-12-11 | 2003-11-19 | 南京林业大学 | Process for preparing middle-density rice straw board |
| CN104070591B (en) * | 2014-07-09 | 2016-11-23 | 万华生态板业研究设计（烟台）有限公司 | Straw-based panel and production method thereof |
| CN105965658A (en) * | 2016-01-04 | 2016-09-28 | 万华生态板业股份有限公司 | Three-layer particle board and manufacture method for same |
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Denomination of invention: Manufacturing Method of Straw Particleboard and Straw Particleboard Effective date of registration: 20231026 Granted publication date: 20200107 Pledgee: Bank of China Limited Xinyang branch Pledgor: Wanhua Hexiang Group Co.,Ltd. Registration number: Y2023980062559 |