CN111605025B - Shaving board production method and shaving board - Google Patents
Shaving board production method and shaving board Download PDFInfo
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- CN111605025B CN111605025B CN202010466571.XA CN202010466571A CN111605025B CN 111605025 B CN111605025 B CN 111605025B CN 202010466571 A CN202010466571 A CN 202010466571A CN 111605025 B CN111605025 B CN 111605025B
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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
- B27N1/00—Pretreatment of moulding material
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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
- B27N1/00—Pretreatment of moulding material
- B27N1/02—Mixing the material with binding agent
- B27N1/0209—Methods, e.g. characterised by the composition of the agent
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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
- B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
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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
Abstract
The embodiment of the invention provides a shaving board production method, which comprises the following steps: preparing raw materials of an upper surface layer and a lower surface layer: processing the straws to enable the size of the processed straws to meet the preset specification; preparing upper and lower subsurface raw materials: processing the wood to ensure that the size of the processed wood meets the preset specification; preparing core layer raw materials for the upper and lower times: processing the wood to ensure that the size of the processed wood meets the preset specification; preparing a core layer raw material: processing the wood to ensure that the size of the processed wood meets the preset specification; sizing: respectively gluing an upper surface layer raw material, a lower core layer raw material and a core layer raw material; paving: uniformly paving the glued upper and lower surface layer raw materials, and respectively directionally paving the upper and lower surface layer raw materials, the upper and lower core layer raw materials and the core layer raw materials; pre-pressing and pressing. The nail-holding force and the tensile resistance of the shaving board produced by adopting the method are improved.
Description
Technical Field
The invention relates to the field of shaving boards, in particular to a shaving board production method and a shaving board.
Background
The shaving board is an artificial board made of wood shavings through the steps of drying, glue mixing, paving, hot pressing and the like, and is widely applied to the fields of building, decoration, packaging and the like due to the physical properties and the proper price of the shaving board.
The shaving board is usually used after being faced by a facing factory after the production is finished, and the surface of the faced shaving board is smooth and can be directly used for decorating the wallboard. The shaving board includes multilayer structure shaving board, and multilayer structure shaving board inner structure is clear, and multilayer structure shaving board includes top layer and sandwich layer, for making things convenient for the shaving board wainscot, the top layer of multilayer structure shaving board needs smoothly level and smooth, therefore the top layer adopts the thin material evenly to mat formation usually.
However, in some applications of particle boards, such as packaging materials or interior panels in buildings, there is no requirement for whether the particle boards are faced or not, but rather, higher requirements are made on the physical properties of the particle boards, such as nail-holding force, tensile resistance and load-bearing capacity, and at this time, if the particle boards are only uniformly paved by fine materials on the surface layer, the physical properties of the produced particle boards may not meet the requirements, and the particle boards cannot be used in the use occasions with high requirements on the physical properties.
Therefore, there is a need to produce particle board with further optimized physical properties, enabling more scenarios to be applied, i.e. a need to propose a method for producing particle board with higher physical properties.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a method for producing a particle board, the particle board comprising upper and lower surface layers, upper and lower sub-core layers, and a core layer, comprising the steps of: preparing raw materials of an upper surface layer and a lower surface layer: processing the straws to enable the size of the processed straws to meet the preset specification; preparing upper and lower subsurface raw materials: processing the wood to ensure that the size of the processed wood meets the preset specification; preparing core layer raw materials for the upper and lower times: processing the wood to ensure that the size of the processed wood meets the preset specification; preparing a core layer raw material: processing the wood to ensure that the size of the processed wood meets the preset specification; sizing: respectively gluing an upper surface layer raw material, a lower core layer raw material and a core layer raw material; paving: uniformly paving the glued upper and lower surface layer raw materials, and respectively directionally paving the glued upper and lower surface layer raw materials, the glued upper and lower core layer raw materials and the glued core layer raw materials by using respective paving machines; pre-pressing and pressing: and pre-pressing and pressing the obtained shaving board blank to obtain the shaving board.
According to the embodiment of the invention, in the paving step, the paving directions of the upper and lower subsurface layer raw materials and the core layer raw material are both the first direction; the paving direction of the upper and lower core layer raw materials is a second direction; the first direction is perpendicular to the second direction.
According to the embodiment of the invention, the step of preparing the raw materials of the upper and lower surface layers further comprises the following steps: cutting off the straws once and placing the cut straws in a straw wet storage bin for storage; drying the straws transported out of the straw wet bin by using a dryer; cutting off the dried straws for the second time; and (4) conveying the secondarily cut straws into a winnowing machine for screening to obtain upper and lower surface layer raw materials meeting the preset specification and storing.
According to the embodiment of the invention, the step of preparing the upper and lower subsurface materials further comprises: slicing the wood and putting the wood into a wet wood shaving bin; drying the wood transported out of the wet wood shaving bin by using a dryer; and (4) conveying the dried wood into a screening machine for screening to obtain upper and lower surface layer raw materials meeting the preset specification and storing.
According to the embodiment of the invention, the steps of preparing the core surface layer raw materials from the previous step to the next step further comprise: slicing the wood and putting the wood into a wet wood shaving bin; drying the wood transported out of the wet wood shaving bin by using a dryer; and (4) conveying the dried wood into a screening machine for screening to obtain upper and lower core layer raw materials meeting the preset specification and storing.
According to an embodiment of the present invention, the step of preparing the core layer raw material further comprises: slicing the wood and putting the wood into a wet wood shaving bin; drying the wood transported out of the wet wood shaving bin by using a dryer; and (4) conveying the dried wood into a screening machine for screening to obtain the core layer raw material meeting the preset specification and storing.
According to an embodiment of the invention, the step of sizing further comprises: measuring the weight of the raw materials of the upper surface layer and the lower surface layer which accounts for 30 percent of the total weight of the raw materials of the shaving board; adding the metered upper and lower surface layer raw materials, organic glue, a tackifier and paraffin into a surface layer sizing machine together for sizing; measuring the upper and lower surface layer raw materials according to the mass of the raw materials accounting for 30 percent of the total raw material mass of the plates of the shaving board; adding the metered upper and lower subsurface raw materials, organic glue and paraffin into a subsurface sizing machine together for sizing; measuring the weight of the upper and lower core layer raw materials which account for 30 percent of the total weight of the raw materials of the shaving board; adding the metered upper and lower secondary core layer raw materials, organic glue and paraffin into a secondary core layer glue applicator together for gluing; measuring the core layer raw material according to the mass of the core layer raw material accounting for 10% of the total raw material mass of the shaving board; and adding the measured core layer raw materials, organic glue and paraffin into a core layer sizing machine together for sizing.
According to an embodiment of the invention, the step of pre-pressing and pressing further comprises: putting the wood shaving board blank into a prepress, and compacting the wood shaving board blank; putting the compacted shaving board blank into a continuous hot press, wherein the pressure parameter variation trend of the continuous hot press is as follows: the pressure is increased to a first pressure section from zero pressure, the pressure is kept for a preset time in the first pressure section, then the pressure is gradually reduced to a second pressure section step by step, the pressure is kept for a preset time in the second pressure section, then the pressure is gradually increased to a third pressure section, the pressure is kept for a preset time in the third pressure section, finally the pressure is gradually reduced to zero pressure, and the first pressure is greater than the third pressure.
An object of an embodiment of the present invention includes providing a particle board, wherein the particle board comprises, in order, an upper surface layer, a last core layer, a next surface layer, and a lower surface layer; and the last-time surface layer, the last-time core layer, the next-time core layer and the next-time surface layer are paved along the preset direction respectively.
According to the embodiment of the invention, the upper surface layer and the lower surface layer are made of straws or a mixture of the straws and wood; the upper and lower subsurface layers are made of wood; the upper and lower secondary core layers are made of wood; the core layer is made of wood.
According to the embodiment of the invention, the paving direction of the core layer is transverse; the paving direction of the upper core layer and the lower core layer is longitudinal; the paving direction of the upper and lower subsurface layers is transverse.
According to the embodiment of the invention, the paving direction of the core layer is longitudinal; the paving direction of the upper and lower core layers is transverse; the paving direction of the upper and lower subsurface layers is longitudinal.
An object of an embodiment of the invention further comprises providing a method for producing a particle board, said particle board comprising upper and lower surface layers, upper and lower sub-core layers and a core layer, comprising the steps of: preparing raw materials of an upper surface layer and a lower surface layer: processing the straws and the woods to enable the sizes of the processed straws and the woods to meet the preset specification, and mixing the processed straws and the woods; preparing upper and lower subsurface raw materials: processing the wood to ensure that the size of the processed wood meets the preset specification; preparing core layer raw materials for the upper and lower times: processing the wood to ensure that the size of the processed wood meets the preset specification; preparing a core layer raw material: processing the wood to ensure that the size of the processed wood meets the preset specification; sizing: respectively gluing an upper surface layer raw material, a lower core layer raw material and a core layer raw material; paving: uniformly paving the glued upper and lower surface layer raw materials, and respectively directionally paving the upper and lower surface layer raw materials, the upper and lower core layer raw materials and the core layer raw materials by using respective paving machines; pre-pressing and pressing: and pre-pressing and pressing the wood shaving board blank obtained by paving to obtain the shaving board.
By adopting the technical scheme, the invention mainly has the following technical effects:
1. the shaving board produced by the production method provided by the invention has the advantages that the middle five layers are directionally paved, so that the overall physical properties of the shaving board, such as nail-holding force, tensile resistance, bearing capacity and the like, are enhanced; the surface layer is uniformly paved, so that the surface properties such as surface bonding strength and the like are improved, and the subsequent processing of the plate and the application range of the plate are conveniently expanded;
2. the shaving board produced by the production method uses the straw to replace the wood raw material, so that the using amount of the wood raw material in the production process of the shaving board can be reduced, and the wood resource is saved; meanwhile, the small-diameter wood raw material is adopted to replace the large-diameter raw material, so that the cost is further reduced;
3. by using the production method, the raw materials are firstly put into a wet storage bin for storage during preparation, so that the fire risk in the production process of the shaving board is reduced.
Drawings
Figure 1 is a flow diagram of a particle board production process according to one embodiment of the present invention;
figure 2 is a flow diagram of a particle board production process according to yet another embodiment of the invention;
figure 3 is a block diagram of a particle board according to an embodiment of the invention.
In the figure: 1. an upper surface layer and a lower surface layer; 11. an upper surface layer; 12. a lower surface layer; 2. upper and lower subsurface layers; 21. a last surface layer; 22. a next subsurface layer; 3. upper and lower secondary core layers; 31. a last-time core layer; 32. a next core layer; 4. a core layer.
Detailed Description
As used herein, straw may refer to the general term of the stem and leaf (ear) part of a mature crop or part of a gramineous plant, and may include, for example, the remainder of a crop such as wheat, rice, corn, potatoes, cotton, sugar cane, grains, etc., after harvesting the seed, and the stem of a bamboo or reed species.
The following description of the embodiments of the present invention is provided in connection with the accompanying drawings.
Referring to fig. 1 and 3, a method of manufacturing a particle board according to an embodiment of the present invention is, for example, used for manufacturing a seven-layer structure particle board, the particle board including upper and lower surface layers 1, upper and lower subsurface layers 2, upper and lower core layers 3, and a core layer 4, the upper and lower surface layers 1 including an upper surface layer 11 and a lower surface layer 12, the upper and lower subsurface layers 2 including an upper subsurface layer 21 and a lower subsurface layer 22, and the upper and lower subsurface layers 3 including an upper subsurface layer 31 and a lower subsurface layer 32. The production method of the shaving board comprises the following steps: preparing raw materials of an upper surface layer and a lower surface layer: processing the straws to enable the size of the processed straws to meet the preset specification; preparing upper and lower subsurface raw materials: processing the wood to ensure that the size of the processed wood meets the preset specification; preparing core layer raw materials for the upper and lower times: processing the wood to ensure that the size of the processed wood meets the preset specification; preparing a core layer raw material: processing the wood to ensure that the size of the processed wood meets the preset specification; sizing: respectively gluing an upper surface layer raw material, a lower core layer raw material and a core layer raw material; paving: uniformly paving the glued upper and lower surface layer raw materials, and respectively directionally paving the upper and lower surface layer raw materials, the upper and lower core layer raw materials and the core layer raw materials by using respective paving machines; pre-pressing and pressing: and pre-pressing and pressing the wood shaving board blank obtained by paving to obtain the shaving board.
In the above steps, the order of the steps of preparing the upper and lower surface layer raw materials, preparing the upper and lower core layer raw materials, and preparing the core layer raw materials is not limited, and the steps of preparing the upper and lower surface layer raw materials, preparing the upper and lower core layer raw materials, and preparing the core layer raw materials may be performed simultaneously or sequentially.
Referring to fig. 1 and 2, the method for processing the straw is not particularly limited, and preferably, in this embodiment, the method for processing the straw is to cut the straw once and store the cut straw in a wet straw bin; drying the straws transported out of the straw wet bin by using a dryer; cutting off the dried straws for the second time; and (4) conveying the secondarily cut straws into a winnowing machine for screening to obtain upper and lower surface layer raw materials meeting the preset specification and storing.
In one embodiment, the straw is cut by a straw cutter, and then the cut straw is shredded or crushed by a straw hammer crusher to obtain a straw material with fibers (usually, the fibers are filamentous substances with a large length-diameter ratio) meeting a predetermined specification. For example, the surface layer material is made to have a size of 120 mesh or larger in a proportion of not more than 10% based on a standard 120 mesh sieve.
Untreated straws are generally large in size, and if the untreated straws are directly placed in a straw wet bin for storage, the utilization rate of the space in the wet bin is low due to the overlong length of the straws, so that the untreated straws are grabbed into a straw conveyor through a fixed grabbing machine and then enter a straw shearing machine for primary cutting; or the straw enters the straw shredder again for shredding. The purpose of once cutting off is not to process the straws to meet the specification of production requirements of the shaving board, but to store the straws conveniently, so that the space utilization rate in the straw wet bin is improved. In order to enable the size of the straw to meet the specification of the production requirement of the shaving board, the straw is required to be cut for the second time after being dried, and the straw in the straw wet bin enters a straw dryer for drying through a ground screw and a conveying belt; preferably, in order to ensure the quality of the shaving board, the moisture of the dried straws is controlled to be 1-3%. And the dried straws enter a straw crusher through a scraper conveyor to be cut off for the second time, so that the specification of the straws meets the specification of the production requirement of the shaving board. In order to remove impurities mixed in the straws after the secondary cutting, the straws after the secondary cutting are sent into a winnowing machine for winnowing, and the straws meeting the production requirements of the shaving board are stored in a straw drying bin as upper and lower surface layer raw materials.
It is understood that the process for treating the straw can be specifically set according to the size of the surface raw material to be obtained, so that a proper process can be selected to obtain the surface raw material according to different application scenes.
The method for processing the wood in the steps of preparing the upper and lower surface layer raw materials, preparing the upper and lower core layer raw materials and preparing the core layer raw materials is not limited, the upper and lower surface layer raw materials, the upper and lower core layer raw materials and the core layer raw materials can be processed by using the same wood, and the upper and lower surface layer raw materials, the upper and lower core layer raw materials and the core layer raw materials can be obtained after screening, or can be prepared by respectively using the respective wood raw materials. Preferably, in this embodiment, the upper and lower surface layer raw materials, the upper and lower core layer raw materials, and the core layer raw material use the same wood, which specifically includes the following steps: slicing the wood and putting the wood into a wet wood shaving bin; drying the wood transported out of the wet wood shaving bin by using a dryer; and (3) conveying the dried wood into a screening machine for screening to respectively obtain an upper surface layer raw material, a lower surface layer raw material, an upper core layer raw material, a lower core layer raw material and a core layer raw material which meet the preset specification, and storing.
Referring to fig. 2, preferably, the wood in this embodiment is non-standard wood such as "remainder", "minor small firewood" of forestry, and wood waste such as wood processing remainder, the step of slicing the wood is to put the wood into two working sections for slicing, the sliced wet wood shavings are put into a wet wood shavings bin for storage through a scraper conveyer, the wet wood shavings are then fed into a wood shavings dryer through the wet wood shavings bin to be dried through the scraper conveyer, in order to ensure the quality of the shaving board, the moisture of the dried wood shavings is controlled to be 3% -5%, the dried wood shavings are put into a drum sieve and a super shavings sieve for screening, the upper and lower surface layer raw materials, the upper and lower core layer raw materials and the core layer raw materials which meet the production requirements of the shaving board are screened, the upper and lower surface layer raw materials are put into an upper and lower surface layer raw material dry bin for storage, the upper and lower core layer raw materials are put into an upper and lower core layer raw material dry bin for storage, and (4) putting the core layer raw material into a core layer raw material dry bin for storage. In order to ensure the physical performance of the shaving board, the specifications of the upper and lower core layer raw materials are larger than those of the upper and lower surface layer raw materials and the core layer raw materials. In one embodiment, the dimensions of the upper and lower core layer raw material shavings are, for example, 30-120 mm long, 10-40 mm wide, and 0.3-0.5 mm thick.
The wood raw material adopted by the invention can avoid using wood with larger diameter, and utilize wood with smaller diameter, thereby reducing the requirement on the raw material, reducing the processing cost and leading the raw material to be easy to obtain.
Referring to fig. 1 and 2, sizing is performed after the preparation of the upper and lower surface layer raw materials, the upper and lower next core layer raw materials, and the core layer raw material is completed. The sizing method is not limited, and in this embodiment, the upper and lower surface layer raw materials, the upper and lower core layer raw materials, and the core layer raw materials are preferably sized by different sizing machines, and sizing by different sizing machines can improve the raw material sizing efficiency. The sizing step in this example was: measuring the weight of the raw materials of the upper surface layer and the lower surface layer which accounts for 30 percent of the total weight of the raw materials of the shaving board; adding the metered upper and lower surface layer raw materials, organic glue, a tackifier and paraffin into a surface layer sizing machine together for sizing; measuring the upper and lower surface layer raw materials according to the mass of the raw materials accounting for 30 percent of the total raw material mass of the plates of the shaving board; adding the metered upper and lower subsurface raw materials, organic glue and paraffin into a subsurface sizing machine together for sizing; measuring the upper and lower core layer raw materials and the core layer raw materials according to the mass of the core layer raw materials accounting for 40 percent of the total raw materials of the shaving board (wherein the core layer accounts for 10 percent); adding the metered upper and lower secondary core layer raw materials, organic glue and paraffin into a secondary core layer glue applicator together for gluing; wherein, the raw materials of the upper and the lower core layers are measured according to the mass of the raw materials accounting for 30 percent of the total raw materials of the plates of the shaving board; and adding the measured core layer raw materials, organic glue and paraffin into a core layer sizing machine together for sizing.
Preferably, in the method for sizing the upper and lower surface layer raw materials in this embodiment, the upper and lower surface layer raw materials in the dry straw bin are conveyed to the surface layer raw material metering bin through the variable frequency speed control belt, and are metered according to the mass of the upper and lower surface layer raw materials accounting for 30% of the total mass of the raw materials of the shaving board, the metered upper and lower surface layer raw materials are added into the ring type glue mixer for sizing, and are added into the ring type glue mixer together with the organic glue, wherein the amount of the organic glue accounts for 2% -6%, more preferably 3.5% -4.5% of the absolute dry weight (when the water content of the raw materials is 0%) of the upper and lower surface layer raw materials; the dosage of the tackifier accounts for 0.5 to 1.0 percent of the absolute dry weight of the raw materials of the upper surface layer and the lower surface layer; and paraffin, wherein the dosage of the paraffin accounts for 0.5 to 1.0 percent of the absolute dry weight of the raw materials of the upper surface layer and the lower surface layer. After the upper and lower surface layer raw materials, the organic glue, the tackifier and the paraffin are added, the ring-type glue mixer is opened to glue the upper and lower surface layer raw materials, and in order to ensure the quality of the shaving board, the moisture of the glued upper and lower surface layer raw materials is controlled to be 9-11%.
Preferably, in the method for sizing the upper and lower raw material layers in this embodiment, the upper and lower raw material layers in the upper and lower raw material layer dry bin are conveyed to the raw material layer metering bin through a variable frequency speed control belt, and are metered according to the mass of the upper and lower raw material layers accounting for 30% of the total mass of the raw materials of the shaving board, the metered upper and lower raw material layers are added into a drum-type glue mixer for sizing, and are also added into the drum-type glue mixer together with organic glue, and the amount of the organic glue accounts for 2% -6%, more preferably 3.5% -4.5% of the absolute dry weight of the upper and lower raw material layers; and paraffin, wherein the dosage of the paraffin accounts for 0.5-1.0% of the absolute dry weight of the upper and lower surface layer raw materials, and in order to ensure the quality of the shaving board, the moisture of the glued upper and lower surface layer raw materials is controlled to be 7-8%.
Preferably, in the sizing method of the upper and lower core layer raw materials in the embodiment, the upper and lower core layer raw materials in the upper and lower core layer raw material dry bin are firstly conveyed to the secondary core layer raw material metering bin through the variable frequency speed control belt, and the upper and lower core layer raw materials are metered according to the mass of 30% of the total raw materials of the shaving board, the metered upper and lower core layer raw materials are added into a drum-type glue mixer for sizing, and are also added into the drum-type glue mixer together with the organic glue, wherein the usage amount of the organic glue accounts for 2% -5%, more preferably 3.5% -4.5% of the absolute dry weight of the upper and lower core layer raw materials; and paraffin, wherein the dosage of the paraffin accounts for 0.5-1.0% of the absolute dry weight of the upper and lower secondary core layer raw materials, and in order to ensure the quality of the shaving board, the moisture of the glued upper and lower secondary core layer raw materials is controlled to be 7-8%.
Similarly, the sizing method for the core layer raw material is, for example, also the method in the above-described examples, wherein the mass of the core layer raw material is measured in terms of 10% of the mass of the total raw material of the board of the particle board; the amount of the organic glue is 2-5%, more preferably 3.5-4.5% of the oven dry weight of the core layer raw material.
Preferably, the organic glue added in the sizing process may decompose formaldehyde into the particle board during the sizing process, and the particle board containing formaldehyde pollutes air and causes damage to the health of users, so in order to ensure that the produced particle board does not contain formaldehyde, the embodiment uses isocyanate glue as the organic glue to size the upper and lower surface layer raw materials, the upper and lower sub-core layer raw materials and the core layer raw material.
The raw materials are placed into the paving machine for paving after glue application, preferably, in the embodiment, the upper and lower surface layer raw materials, the upper and lower core layer raw materials and the core layer raw materials are respectively paved by using different paving machines, so that paving is not required to be performed after glue application of all the raw materials is completed, and paving is performed by placing the raw materials into the corresponding paving machines after glue application of the raw materials is completed. For example, if the sizing of the upper and lower surface layer raw materials is finished, the upper and lower surface layer raw materials are laid in the upper and lower surface layer paving machine without waiting for the completion of the sizing of other layer raw materials and then laying the upper and lower surface layer raw materials; the core layer raw material is applied with glue secondly, and the core layer raw material is laid in a core layer laying machine without waiting for the completion of the application of glue of other layer raw materials; gluing the upper and lower core layer raw materials, paving the upper and lower core layer raw materials in an upper and lower core layer paving machine, and paving the upper and lower core layer raw materials without waiting for the gluing of the upper and lower surface layer raw materials; and (3) gluing the upper and lower surface layer raw materials, and paving the upper and lower surface layer raw materials in an upper and lower surface layer paving machine.
In order to ensure that the physical properties of the shaving board, such as nail-holding capacity, tensile resistance, bearing capacity and the like, can meet the use requirements, the upper surface layer raw material and the lower surface layer raw material are paved with the core layer raw material in a first direction, the upper surface layer raw material and the lower surface layer raw material are paved with the core layer raw material in a second direction, and the first direction is perpendicular to the second direction. By adopting the paving method, the shaving board can be ensured not to deform when being influenced by the external environment, so that the physical performance of the shaving board is improved. The first direction and the second direction are not limited herein, and the first direction may be a transverse direction or a longitudinal direction, the second direction is a longitudinal direction when the first direction is the transverse direction, and the second direction is a transverse direction when the first direction is the longitudinal direction. The middle five-layer structure of the shaving board is directionally paved, the paving direction between adjacent layers is vertical, the physical performance of the shaving board can be improved, when the shaving board is used as a package or a structure (such as a board which is not exposed in a wardrobe), the shaving board which is directionally paved by adopting the middle five-layer structure has better stability, and the nail-holding capacity and the bearing capacity are stronger.
It can be understood that the five middle layers of the shaving board are all laid in an oriented mode, and for example, five oriented laying heads are respectively adopted for simultaneous laying, so that the laying efficiency is improved.
After the seven layers of raw materials of the shaving board are paved, pre-pressing and hot-pressing are needed to be carried out on the paved shaving board blank, air in the shaving board blank is discharged in the pre-pressing process, and the shaving board blank is compacted; and (4) putting the pre-pressed shaving board blank into a hot press for continuous hot pressing to solidify the organic glue in the shaving board blank to obtain a finished shaving board product. Preferably, after the pre-pressed wood shaving board blank enters the hot press, the pressure parameter variation trend of the continuous hot press is as follows: the pressure is increased to a first pressure section from zero pressure, the pressure is kept for a preset time in the first pressure section, then the pressure is gradually reduced to a second pressure section step by step, the pressure is kept for a preset time in the second pressure section, then the pressure is gradually increased to a third pressure section, the pressure is kept for a preset time in the third pressure section, finally the pressure is gradually reduced to zero pressure, and the first pressure is greater than the third pressure. The specific values of the first pressure, the second pressure and the third pressure are not limited, and in this embodiment, the value of the first pressure is 4.0Mpa, the value of the second pressure is 0.5Mpa, and the value of the third pressure is 1.5 Mpa; correspondingly, the hot pressing is carried out at different pressure sections by selecting proper temperature.
And (4) carrying out subsequent post-treatment such as sanding, cutting and sawing on the shaving board obtained after the hot pressing is finished to obtain the shaving board meeting the use specification.
The types of the raw materials for the upper and lower surface layers are not limited, and in some embodiments, the raw materials for the upper and lower surface layers of the particle board are mixed materials of wood and straw or pure wood. For example, a method of producing particle board comprises the steps of: preparing raw materials of an upper surface layer and a lower surface layer: processing the straws and the woods to enable the sizes of the processed straws and the woods to meet the preset specification, and mixing the processed straws and the woods; preparing upper and lower subsurface raw materials: processing the wood to ensure that the size of the processed wood meets the preset specification; preparing core layer raw materials for the upper and lower times: processing the wood to ensure that the size of the processed wood meets the preset specification; preparing a core layer raw material: processing the wood to ensure that the size of the processed wood meets the preset specification; sizing: respectively gluing an upper surface layer raw material, a lower core layer raw material and a core layer raw material; paving: uniformly paving the glued upper and lower surface layer raw materials, and respectively directionally paving the upper and lower surface layer raw materials, the upper and lower core layer raw materials and the core layer raw materials by using respective paving machines; pre-pressing and pressing: and pre-pressing and pressing the obtained shaving board blank to obtain the shaving board.
The straw part can be used for replacing wood only by using the straw or using the mixture of the straw and the wood as the raw materials of the upper surface layer and the lower surface layer of the shaving board, so that the use amount of the wood in the shaving board is reduced, the raw materials of the wood can be saved, and the green development of the shaving board is realized.
Referring to fig. 3, the particle board manufactured according to the particle board manufacturing method disclosed in the present invention includes an upper surface layer 11, a last time surface layer 21, a last time core layer 31, a core layer 4, a next time core layer 32, a next time surface layer 22, and a lower surface layer 12 in this order; wherein the previous surface layer 21, the previous core layer 31, the core layer 4, the next core layer 32 and the next surface layer 22 are respectively paved along a predetermined direction. The raw materials of the upper surface layer 11 and the lower surface layer 12 of the particle board are not limited, and the raw materials of the upper surface layer 11 and the lower surface layer 12 can be only straw, only wood or a mixed material of straw and wood. The predetermined direction is not limited, but it is preferable that the paving direction between adjacent layers in the particle board is vertical, for example, the paving direction of the core layer 4 is horizontal, the paving direction of the previous core layer 31 and the next core layer 32 is vertical, and the paving direction of the previous surface layer 21 and the next surface layer 22 is horizontal. The paving direction of the core layer 4 can also be vertical, the paving direction of the previous core layer 31 and the next core layer 32 is horizontal, and the paving direction of the previous surface layer 21 and the next surface layer 22 is vertical.
According to the requirements of national standard GB/T4897-2015 of the particle board and the physical property test method of the artificial board and the artificial veneer of GB/T17657-2013, the performance indexes of the particle board with the exemplary oriented structure are as follows:
thickness: 18mm
Density: 620kg/m3
Internal bonding strength: 0.86MPa
Table bond strength: 1.46MPa
Static bending strength (parallel): 19.7MPa
Static bending strength (vertical): 16.8MPa
Flexural modulus (parallel): 3458MPa
Flexural modulus (vertical): 3040MPa
According to the measured physical and chemical performance indexes, the static bending strength, the bending elastic modulus and the like of the shaving board in the vertical direction are improved, and the performances of nail holding force, tensile resistance, bearing capacity and the like of the board are enhanced, so that the board can meet the use requirements in various occasions.
Meanwhile, the particle board obtained by adopting the embodiment is improved in raw material, and compared with the common particle board with a multi-layer structure, the use of wood raw material can be reduced by about 10%.
The above embodiments are only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore all equivalent technical solutions also belong to the scope of the present invention, and the protection scope of the present invention should be defined by the claims.
Claims (13)
1. A method of manufacturing a particle board, said particle board comprising upper and lower skin layers, upper and lower subsurface layers, upper and lower core layers and a core layer, comprising the steps of:
preparing raw materials of an upper surface layer and a lower surface layer: processing the straws to enable the size of the processed straws to meet the preset specification;
preparing upper and lower subsurface raw materials: processing the wood to ensure that the size of the processed wood meets the preset specification;
preparing core layer raw materials for the upper and lower times: processing the wood to ensure that the size of the processed wood meets the preset specification;
preparing a core layer raw material: processing the wood to ensure that the size of the processed wood meets the preset specification;
sizing: respectively gluing an upper surface layer raw material, a lower core layer raw material and a core layer raw material;
paving: uniformly paving the glued upper and lower surface layer raw materials; and is
Respectively directionally paving the glued upper and lower surface layer raw materials, upper and lower core layer raw materials and core layer raw materials by using respective paving machines;
pre-pressing and pressing: pre-pressing and pressing the obtained shaving board blank to obtain a shaving board;
and the specifications of the upper and lower secondary core layer raw materials are larger than those of the upper and lower secondary surface layer raw materials and the core layer raw materials.
2. The production method according to claim 1,
in the paving step, the paving directions of the upper and lower subsurface layer raw materials and the core layer raw material are both a first direction;
the paving direction of the upper and lower core layer raw materials is a second direction;
the first direction is perpendicular to the second direction.
3. The production method according to claim 1, wherein,
the preparation of the upper and lower surface layer raw materials further comprises the following steps:
cutting off the straws once and placing the cut straws in a straw wet storage bin for storage;
drying the straws transported out of the straw wet bin by using a dryer;
cutting off the dried straws for the second time;
and (4) conveying the secondarily cut straws into a winnowing machine for screening to obtain upper and lower surface layer raw materials meeting the preset specification and storing.
4. The production method according to claim 1, wherein,
the preparation steps of the upper and lower subsurface layer raw materials further comprise:
slicing the wood and putting the wood into a wet wood shaving bin;
drying the wood transported out of the wet wood shaving bin by using a dryer;
and (4) conveying the dried wood into a screening machine for screening to obtain upper and lower surface layer raw materials meeting the preset specification and storing.
5. The production method according to claim 1,
the preparation steps of the upper core layer raw material and the lower core layer raw material further comprise:
slicing the wood and putting the wood into a wet wood shaving bin;
drying the wood transported out of the wet wood shaving bin by using a dryer;
and (4) conveying the dried wood into a screening machine for screening to obtain upper and lower core layer raw materials meeting the preset specification and storing.
6. The production method according to claim 1, wherein,
the core layer raw material preparation step further comprises:
slicing the wood and putting the wood into a wet wood shaving bin;
drying the wood transported out of the wet wood shaving bin by using a dryer;
and (4) conveying the dried wood into a screening machine for screening to obtain the core layer raw material meeting the preset specification and storing.
7. The production method according to claim 1, wherein,
the step of sizing further comprises:
measuring the weight of the raw materials of the upper surface layer and the lower surface layer which accounts for 30 percent of the total weight of the raw materials of the shaving board;
adding the metered upper and lower surface layer raw materials, organic glue, a tackifier and paraffin into a surface layer sizing machine together for sizing;
measuring the upper and lower surface layer raw materials according to the mass of the raw materials accounting for 30 percent of the total raw material mass of the plates of the shaving board;
adding the metered upper and lower subsurface raw materials, organic glue and paraffin into a subsurface sizing machine together for sizing;
measuring the weight of the raw materials of the upper and lower core layers to be 30% of the total raw materials of the shaving board;
adding the metered upper and lower secondary core layer raw materials, organic glue and paraffin into a secondary core layer glue applicator together for gluing;
measuring the core layer raw material according to the mass of the core layer raw material accounting for 10% of the total raw material mass of the plates of the shaving board;
and adding the measured core layer raw materials, organic glue and paraffin into a core layer sizing machine together for sizing.
8. The production method according to claim 1, wherein,
the pre-pressing and pressing step further comprises:
putting the wood shaving board blank into a prepress, and compacting the wood shaving board blank;
putting the compacted shaving board blank into a continuous hot press, wherein the pressure parameter variation trend of the continuous hot press is as follows:
the pressure is increased to a first pressure section from zero pressure, the pressure is kept for a preset time in the first pressure section, then the pressure is gradually reduced to a second pressure section step by step, the pressure is kept for a preset time in the second pressure section, then the pressure is gradually increased to a third pressure section, the pressure is kept for a preset time in the third pressure section, finally the pressure is gradually reduced to zero pressure, and the first pressure is greater than the third pressure.
9. A particle board, wherein,
the shaving board sequentially comprises an upper surface layer, a last time core layer, a next time surface layer and a lower surface layer;
the previous surface layer, the previous core layer, the next core layer and the next surface layer are paved along the preset direction respectively;
wherein, the specifications of the upper and lower secondary core layer raw materials are larger than the specifications of the upper and lower secondary surface layer raw materials and the core layer raw materials.
10. Particle board according to claim 9,
the upper surface layer and the lower surface layer are made of straws or a mixture of the straws and wood;
the upper and lower secondary surface layers are made of wood;
the upper and lower secondary core layers are made of wood;
the core layer is made of wood.
11. Particle board according to claim 9,
the paving direction of the core layer is transverse;
the paving direction of the upper core layer and the lower core layer is longitudinal;
the paving directions of the upper and lower subsurface layers are transverse.
12. Particle board according to claim 9,
the paving direction of the core layer is longitudinal;
the paving direction of the upper core layer and the lower core layer is transverse;
the paving direction of the upper and lower subsurface layers is longitudinal.
13. A method of manufacturing a particle board, said particle board comprising upper and lower skin layers, upper and lower subsurface layers, upper and lower core layers and a core layer, comprising the steps of:
preparing raw materials of an upper surface layer and a lower surface layer: treating the straws and the woods to enable the sizes of the treated straws and the woods to meet the preset specification, and mixing the treated straws and the woods;
preparing raw materials of an upper surface layer and a lower surface layer: processing the wood to ensure that the size of the processed wood meets the preset specification;
preparing core layer raw materials for the upper and lower times: processing the wood to ensure that the size of the processed wood meets the preset specification;
preparing a core layer raw material: processing the wood to ensure that the size of the processed wood meets the preset specification;
sizing: respectively gluing an upper surface layer raw material, a lower core layer raw material and a core layer raw material;
paving: uniformly paving the glued upper and lower surface layer raw materials, and respectively directionally paving the glued upper and lower surface layer raw materials, the glued upper and lower core layer raw materials and the glued core layer raw materials by using respective paving machines;
pre-pressing and pressing: pre-pressing and pressing the obtained shaving board blank to obtain a shaving board;
and the specifications of the upper and lower secondary core layer raw materials are larger than those of the upper and lower secondary surface layer raw materials and the core layer raw materials.
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