CN108177227A

CN108177227A - The manufacturing method of wood shavings fiber composite plate and wood shavings fiber composite plate

Info

Publication number: CN108177227A
Application number: CN201711343426.7A
Authority: CN
Inventors: 赵治美
Original assignee: Wanhua Ecoboard Xinyang Co Ltd
Current assignee: Wanhua Ecoboard Xinyang Co Ltd
Priority date: 2017-12-14
Filing date: 2017-12-14
Publication date: 2018-06-19

Abstract

The present invention provides a kind of manufacturing method of wood shavings fiber composite plate, and method includes the following steps：The preparation of fiber material, the preparation of wood shavings material, preparation, the preparation of core layer material and the preparation of wood shavings fiber composite plate of surface layer material.In the preparation of surface layer material, fiber material and wood shavings material are mixed to prepare wood shavings fiber mixture, surface layer material is prepared with wood shavings fiber mixture.In the preparation of wood shavings fiber composite plate, expected using core layer material and surface layer, by mating formation, precompressed, hot pressing and post-processing step, wood shavings fiber composite plate is made.The present invention also provides a kind of wood shavings fiber composite plates manufactured according to above-mentioned manufacturing method.The wood shavings fiber composite plate of manufacturing method according to the invention manufacture has the water resistance of the surface bonding strength improved and enhancing.

Description

Method for manufacturing wood shaving fiber composite board and wood shaving fiber composite board

Technical Field

The invention relates to the field of shaving board manufacturing, in particular to a method for manufacturing a shaving fiber board by mixing wood shavings and wood fibers and a shaving fiber board manufactured by the manufacturing method.

Background

Particle boards are manufactured by gluing particles made of wood or other lignocellulosic materials with an adhesive under the action of heat and pressure. The method is mainly used in the fields of furniture manufacturing, building industry, train and automobile carriage manufacturing and the like. The demand for the shaving board is large in China, and the shaving board has large market space.

The shaving board is formed by bonding and pressing wood particle crushed aggregates and an adhesive, and a large amount of particle wood exists in the shaving board, so that the surface routing and carving performance of the shaving board is poor, and the shaving board can only be subjected to veneering and has poor painting and finishing effects. Because the particle boards are granular inside, the bonding force among the particle boards is small, and the bonding is not strong, the surface strength of the particle boards is small, and the particle boards are not suitable for manufacturing products with high requirements on the surface strength. In addition, the shaving board is not easy to mill, and edge breakage is easy to occur during board cutting, so that the requirements of partial processes on processing equipment are high.

The fiberboard is also named as a density board, and is an artificial board made of wood fibers or other plant cellulose fibers as raw materials and adhesive. The fiber board has the advantages of uniform material, small longitudinal and transverse strength difference, difficult cracking and the like, and has wide application. The large disadvantage of the fiberboard is that the fiberboard is not moisture-proof, and can expand when meeting water, and the fiberboard generates large deformation to cause damage to the product. In addition, the nail holding capacity of the fiberboard is poor, and the nail holding capacity of the fiberboard is greatly different from that of a solid board, a particle board and the like due to the fact that fibers of the fiberboard are very finely crushed.

Accordingly, there is a need in the art to provide a manufactured panel capable of improving water resistance and nail-holding power while ensuring certain surface strength and surface workability, and a related manufacturing method.

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 shaving fiber composite board and a shaving fiber composite board manufactured using the same.

According to one aspect of the present invention, there is provided a method of manufacturing a particle fiber composite board, the method comprising the steps of:

preparing a fiber material: preparing a fiber material by using a composite board raw material;

preparing shaving materials: preparing shaving materials by using composite board raw materials;

preparing a surface material: mixing the fiber material and the wood shaving material to prepare wood shaving fiber mixture, and preparing the surface layer material from the wood shaving fiber mixture;

preparing a core layer material: preparing a core layer material by using a wood shaving or shaving material; and

preparing the wood shaving fiber composite board: the core layer material and the surface layer material are used for preparing the wood shaving fiber composite board through the steps of paving, prepressing, hot pressing and post-processing.

According to the method for manufacturing the shaving fiber composite board, the mixture of the shavings and the fibers is used as the main material in the surface material, so that the surface strength of the composite board can be greatly improved, and the surface processability of the shaving board can be improved (for example, the surface decoration performance of the shaving board can be improved). In addition, the wood shaving fiber composite board manufactured by the manufacturing method has the wood shaving core layer and has the characteristic of quick air exhaust, so that the hot pressing time in the composite board manufacturing process can be greatly shortened, and the production efficiency of the composite board can be greatly improved.

According to a preferred embodiment of the method for manufacturing a particle fibre composite board according to the invention, the raw material of the composite board may comprise wood and/or straw. Advantageously, wood, such as wood fibers and wood shavings, can be used preferably.

In another preferred embodiment of the method for manufacturing the particle fiber composite board according to the present invention, the preparation of the fiber material includes peeling and chipping the wood, and subjecting the chipped wood to water washing, water boiling and hot grinding to prepare the fiber material. Or the preparation of the fiber material can also comprise the steps of chipping the straws, and washing, boiling and hot-grinding the chipped straws to prepare the fiber material.

According to a further preferred embodiment of the method for manufacturing a particle-fibre composite board according to the invention, the fibre material has a size distribution of:

0 to 1% by weight of a fiber having a fiber size of 5 mesh or more, 21 to 25% by weight of a fiber having a fiber size of 25 mesh or more and less than 5 mesh, 27 to 35% by weight of a fiber having a fiber size of 45 mesh or more and less than 25 mesh, 16 to 20% by weight of a fiber having a fiber size of 80 mesh or more and less than 45 mesh, 9 to 11% by weight of a fiber having a fiber size of 120 mesh or more and less than 80 mesh, and 14 to 25% by weight of a fiber having a fiber size of less than 120 mesh.

In a further preferred embodiment of the method for manufacturing a particle fiber composite board according to the invention, the size distribution of the fiber material is:

0.25% by weight of a fiber size of 5 mesh or more, 23% by weight of a fiber size of 25 mesh or more and less than 5 mesh, 27% by weight of a fiber size of 45 mesh or more and less than 25 mesh, 16.8% by weight of a fiber size of 80 mesh or more and less than 45 mesh, 9.5% by weight of a fiber size of 120 mesh or more and less than 80 mesh, and 23.45% by weight of a fiber size of less than 120 mesh.

According to a further preferred embodiment of the method for manufacturing a particle fiber composite board according to the invention, the particle material is present in the particle fiber mixture in a weight percentage of 5% to 10%.

In a further preferred embodiment of the method for manufacturing a particle fiber composite board according to the invention, the preparation of the particle material and the preparation of the core material comprise:

preparing wood shavings: chipping and slicing wood to prepare wood shavings;

screening wood shavings: conveying wood shavings to a screening device to screen the wood shavings into shavings coarse material, shavings qualified material and shavings fine material, wherein the shavings fine material is used as the shavings material;

treating coarse wood shavings: thinning the coarse wood shaving material by using thinning equipment, and conveying the thinned coarse wood shaving material and the wood shavings to screening equipment together so as to further screen the thinned coarse wood shaving material; and

and preparing the core layer material by using the qualified shaving material.

According to another preferred embodiment of the method for manufacturing a particle fiber composite board according to the invention, the preparing of the core layer material from the particle qualified material comprises:

conveying qualified shaving materials to first airflow sorting equipment for airflow sorting; and

applying glue to qualified shaving material after air flow separation to prepare core layer material,

and/or, the preparation of the surface material by the wood shaving fiber mixture comprises the following steps:

conveying the wood shaving fiber mixture to a second air flow sorting device for air flow sorting; and

and (3) gluing the wood shaving fiber mixture subjected to air flow separation to prepare the surface layer material.

In a further preferred embodiment of the method for manufacturing a wood wool composite board according to the invention, the screening device comprises a square or bar screen, which screens the wood wool into wood wool coarse material, wood wool accept material and wood wool fine material.

According to still another preferred embodiment of the method for manufacturing a particle fiber composite board of the present invention, the first layer screen of the square-hole screen has a hole diameter in a range of 8mm × 8mm to 12mm × 12mm, and the second layer screen of the square-hole screen has a hole diameter in a range of 0.2mm × 0.2mm to 0.5mm × 0.5 mm; the aperture of the first layer screen mesh of the strip-shaped screen is in the range of 3mm multiplied by 30mm to 4mm multiplied by 40mm, and the aperture of the second layer screen mesh of the strip-shaped screen is in the range of 0.1mm multiplied by 0.8mm to 0.3mm multiplied by 1.2 mm.

In a further preferred embodiment of the method for manufacturing a particle fibre composite board according to the invention, the adhesive applied in the sizing step comprises an isocyanate glue.

According to another preferred embodiment of the method for manufacturing a shaving fiber composite board of the present invention, in the step of sizing the air-flow-sorted shaving acceptable material to prepare the core layer material, the isocyanate glue is applied in an amount of 2.0% to 4.0% by weight of the shaving acceptable material to be sized;

and/or in the step of applying glue to the airflow-sorted wood wool fiber mixture to prepare the surface material, the application amount of the isocyanate glue is 3.0-5.0% of the weight of the wood wool fiber mixture to be applied with glue.

In a further preferred embodiment of the method for manufacturing a particle fiber composite board according to the invention, the method for manufacturing further comprises:

drying the strands of wood prior to conveying the strands of wood to the screening apparatus;

and/or drying the fiber material prior to conveying the fiber material to the second air flow sorting device.

According to yet another preferred embodiment of the method for manufacturing a particle fiber composite board according to the invention, the step of preparing the particle fiber composite board comprises:

dividing the surface material into an upper surface material and a lower surface material;

sequentially paving a lower surface layer material, a core layer material and an upper surface layer material to obtain a plate blank;

pre-pressing the plate blank; and

and (5) hot-pressing the slab.

The invention also provides a wood shaving fiber composite board manufactured by any one of the manufacturing methods.

The present invention further provides a wood wool fiber composite board comprising:

an upper surface layer, the upper surface layer comprising: a mixture of wood shavings and fibers, and an adhesive;

a core layer, the core layer comprising: shavings or flakes, and an adhesive; and

a lower skin layer, the lower skin layer comprising: a mixture of wood shavings and fibers, and an adhesive.

In a preferred embodiment of the wood wool fibre composite board according to the invention, the wood wool comprises wood wool and/or straw wool; the fibers comprise wood fibers and/or straw fibers; and/or the adhesive comprises an isocyanate adhesive.

According to another preferred embodiment of the particle fiber composite board according to the invention, the above-mentioned fibers have a size distribution of:

In a further preferred embodiment of the particle fiber composite board according to the invention, the above-mentioned fibers have a size distribution of:

According to a further preferred embodiment of the wood wool fiber composite board according to the invention, the weight percentage of the wood wool in the mixture of wood wool and fiber is 5% to 10%.

In a further preferred embodiment of the wood wool fiber composite board according to the invention, the core layer comprises straw wood wool, a binder and an auxiliary agent; or the core layer comprises wood shavings, an adhesive and an auxiliary agent; or the core layer comprises an upper core layer, a middle core layer and a lower core layer, each of the upper core layer, the middle core layer and the lower core layer comprises wood shavings or straw shavings, the wood shavings or the straw shavings in the upper core layer are arranged in a first preset direction, the wood shavings or the straw shavings in the middle core layer are arranged in a second preset direction, and/or the wood shavings or the straw shavings in the lower core layer are arranged in a third preset direction.

Drawings

Other objects and advantages of the present invention will be more readily understood and appreciated by reference to the following description of the invention taken in conjunction with the accompanying drawings, which are a full and enabling description of the invention as a whole.

FIG. 1 is a process flow diagram of a method of manufacturing a particleboard fiber composite panel according to an exemplary embodiment of the present disclosure; and

fig. 2 is a schematic structural view of a shaving fiber composite board manufactured by the 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.

The expression "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 wheat, rice, corn, potatoes, oilseed rape, cotton, sugar cane, tobacco stems and other crops (usually roughages) after harvesting the seeds, as well as the stem and stem of bamboo or reed species.

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 expression "fibres" refers to the basic elements constituting the fibreboard, which may be elements made of wood or other plant fibre raw materials by mechanical, chemical, mechanical and chemical methods, for example, in the fibreboard industry it may refer to fibre tows. Typically, "fibers" are filamentous substances that have a greater aspect ratio than "strands".

The expressions "coarse" or "coarse", "accept" or "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, the strands of "accept" are intermediate, and the strands of "fines" are smaller. The sizes of the shavings for dividing into "coarse material" or "coarse material", and "qualified material" or "fine material" may be different according to the actual application or application. For example, the chip size of "coarse" or "coarse", "accept" or "fines" used in the surface layers of a particle board may differ from the chip size of "coarse" or "coarse", "accept" or "fines", respectively, used in the core layer of a particle board.

In this context, unless otherwise indicated, "mesh" is the mesh of a standard vibrating screen, which typically corresponds to the screen opening size as follows:

mesh size (mm)	Standard mesh number (mu)
		4.75	4
4.00	5
		2.00	10
1.70	12
		0.850	20
0.710	25
		0.425	40
0.355	45
		0.250	60
0.180	80
		0.150	100
0.125	120

According to an exemplary embodiment of the invention, a method of manufacturing a particle fiber composite board is provided, the method comprising the steps of:

The composite board raw material can be wood and/or straw. For example, the fiber material and the shaving material can be simultaneously prepared by wood; the fiber material and the wood shaving material can also be prepared by adopting straws; in addition, the fiber material can be prepared by wood, and the wood shaving material is prepared by straw; the fiber material can also be prepared by adopting straws, and the shaving material can also be prepared by adopting wood. In this case, wood fiber materials and wood shaving materials are preferably used. The following description will be made of the manufacturing process of the composite board by taking wood shavings and wood fibers as raw materials to manufacture the wood shavings fiber composite board according to the present invention.

The method of manufacturing the particle fiber composite board according to the embodiment of the present invention is described in further detail below with reference to fig. 1.

Preparing wood shavings: chipping and slicing wood to prepare wood shavings;

screening wood shavings: conveying the wood shavings to a screening device to screen the wood shavings into coarse wood shavings, qualified wood shavings and fine wood shavings, wherein the fine wood shavings can be used as a shavings material for preparing a surface layer, and the fine wood shavings and a fiber material are mixed to prepare a shavings-fiber mixture;

treating the coarse wood shavings: thinning the coarse wood shaving materials by using thinning equipment, and conveying the thinned coarse wood shaving materials and the wood shavings to screening equipment together so as to further screen the thinned coarse wood shaving materials;

preparing wood fibers: the wood is peeled and chipped, and the chipped wood is subjected to water washing, water boiling and hot grinding to prepare a wood fiber material, which can be used as a fiber material for preparing a surface material.

According to the manufacturing method of the wood shaving fiber composite board, the wood shavings are screened, and only the screened qualified wood shavings can be used as the core layer material, so that excessive coarse materials are prevented from being contained in the core layer, and the strength of the manufactured wood shaving fiber composite board can meet the requirements of national standards. The method recycles the wood shaving fine materials generated in the wood shaving screening process, thereby improving the utilization rate of wood raw materials and avoiding the waste of the wood shaving fine materials. The surface processability of particle board, such as its surface decorability, can be improved by providing a particle board surface layer comprising wood wool fines and wood fibers. In addition, the surface strength of the shaving board can be greatly improved by adding wood fibers into the surface layer. The process of regrinding is added, the coarse wood shavings can be changed into qualified wood shavings through the regrinding process, and the utilization rate of wood raw materials is further improved. Because wood shavings fibre composite sheet has the wood shavings sandwich layer, it has the fast characteristics of exhausting, consequently can shorten the hot pressing time in the composite sheet manufacturing process greatly, consequently can improve the production efficiency of composite sheet.

In addition, the straw can be used for preparing fiber materials, and the preparation of the fiber materials through the straw can comprise the steps of chipping the straw, and washing, boiling and hot grinding the chipped straw to prepare the straw fiber materials.

In the manufacturing method of the wood wool fiber composite board according to the exemplary invention, the preparation of the wood wool may specifically comprise the steps of:

wood chipping: the wood is processed into chips of a certain size and shape by a chipper.

Slicing: the strands are processed to the desired size and shape using a flaker.

And (3) drying: the moisture content of the wood shavings meets the required technological requirements through a dryer.

According to an embodiment of the exemplary manufacturing method according to the invention, said manufacturing method further comprises a screening step after said wood strands are produced. In the screening step, the wood strands are conveyed to a screening device to screen the wood strands into coarse wood strand material, qualified wood strand material, and fine wood strand material. In one embodiment, the screening apparatus may comprise a square or bar screen, which may comprise two layers of screen mesh, thereby screening the wood strands into wood strand coarse, wood strand fine and wood strand coarse. For example, the first layer of the square mesh screen has an aperture in the range of 8mm × 8mm to 12mm × 12mm, and the second layer of the square mesh screen has an aperture in the range of 0.2mm × 0.2mm to 0.5mm × 0.5 mm; the first layer of screens of the bar screen may have an aperture in the range 3mm x 30mm to 4mm x 40mm and the second layer of screens of the bar screen may have an aperture in the range 0.1mm x 0.8mm to 0.3mm x 1.2 mm. Advantageously, the first layer of mesh, for example a square mesh screen, may have apertures of 10mm x 10mm, the square mesh screen also including a second layer of mesh having apertures of 0.2mm x 0.2 mm. Like this, with the help of this square mesh sieve, the timber wood shavings of the first layer screen cloth that does not pass through the square mesh sieve can regard as the thick big material of timber wood shavings, but the timber wood shavings of the second layer screen cloth that passes through the first layer screen cloth of square mesh sieve but does not pass through the square mesh sieve can regard as the timber wood shavings certified material, and the timber shavings of the second layer screen cloth that passes through the square mesh sieve can regard as timber shavings fine material. In the example where the first screen of the square-hole sieve has an aperture of 10mm × 10mm and the second screen has an aperture of 0.2mm × 0.2mm, wood shavings having a shavings size smaller than 10mm × 10mm and larger than 0.2mm × 0.2mm may be used as the wood shavings acceptable material, wood shavings having a shavings size larger than 10mm × 10mm may be used as the wood shavings coarse material, and wood shavings having a shavings size smaller than 0.2mm × 0.2mm may be used as the wood shavings fine material.

Through setting up screening installation's parameter, can control the wood shavings size of the timber wood shavings certified material of selecting, only the timber wood shavings certified material of selecting can be used for the core layer material, can prevent that the wood shavings from thick and big material from appearing in the core layer material of panel, also prevents the fine material of too fine and small bits from appearing in the core layer material of panel simultaneously, can greatly improve the hydroscopicity and the humidity resistance of panel core material from this. In addition, the core layer of the wood shaving fiber composite board manufactured by the manufacturing method disclosed by the invention is quick in air exhaust, so that the hot pressing time in the manufacturing process of the composite board can be greatly shortened.

According to an exemplary embodiment of the invention, the manufacturing method according to the invention further comprises a step of processing the wood shavings rough material. In the processing step of the coarse wood shaving material, the coarse wood shaving material is ground by a refining device, such as a grinding device, and the ground coarse wood shaving material and the wood shavings are conveyed to a screening device together, so that the ground coarse wood shaving material is further screened into coarse wood shaving material, qualified wood shaving material and fine wood shaving material. In one example, the grinding apparatus may be a screen ring sander, such as a BX5612 screen ring sander, to grind the straw grits into finer shavings.

In the manufacturing method of the shaving fiber composite board according to the exemplary embodiment of the present invention, the preparation of the wood fiber may specifically include the steps of:

wood peeling: and (4) carrying out peeling operation on the primarily selected wood by using a wood peeling machine so as to remove the wood bark fibers.

Chipping: the wood is processed into chips of a certain size and shape by a chipper.

Washing with water: and washing or impregnating the wood chips sliced by the chipping machine through water washing equipment to obtain the wood chips with certain moisture content.

And (3) cooking: the washed chips may be cooked using a wood digester. For example, the steam temperature in the wood digester is controlled at 160 ℃ to 180 ℃ to reduce the mechanical properties between the wood cell walls and soften the intercellular layer that makes the fibers firm. When the temperature is higher than 160 ℃, the intercellular layer is in a molten state and loses the binding force, the fiber is separated at the moment, the form of the fiber is best, and the energy consumption is only 1/4-1/5 of the normal temperature.

Hot grinding: the cooked wood chip raw material is forced to be sent between two grinding discs in a grinding chamber with high temperature, high humidity and high pressure, and is acted by the pressure and rotation of the grinding discs. The size and morphology of the fibers was controlled by adjusting the thermo-mill impact, gap of the static discs, and disc pressure.

And (3) drying: drying the wood fiber obtained by hot grinding through a dryer, for example, the moisture content of the dried wood fiber is between 9% and 11%.

The dried wood fibers had the size distribution shown in table 1 below:

TABLE 1 Wood fiber size distribution

According to an exemplary embodiment of the present invention, the method of manufacturing a particle fiber composite board, as shown in fig. 1, may further include an air-flow classification step and a sizing step to prepare a skin layer material and a core layer material. During the preparation of the core material, the qualified wood shaving material can be conveyed to a first airflow sorting device for airflow sorting, so that impurities such as stones, soil, iron blocks and the like in the qualified wood shaving material can be removed. In one example, the first airflow separation device may comprise an airflow classifier. In the gluing step, gluing the qualified wood shaving material subjected to air flow separation to prepare the core layer material.

According to an exemplary embodiment of the method for manufacturing a particle fiber composite board according to the present invention, the step of preparing the skin stock of the manufacturing method further comprises an air-flow sorting step and a sizing step. Before the sorting step, the wood shaving fine material screened in the preparation process of the qualified wood shaving material is mixed with the prepared wood fiber material to prepare a wood shaving fiber mixture, wherein the weight percentage of the wood shaving fine material in the wood shaving fiber mixture is 5-10%, for example, 8%. Next, the wood shaving fiber mixture is subjected to an air flow sorting operation.

In this air-flow separation step, the wood shaving fiber mixture may be conveyed to a second air-flow separation device for air-flow separation to remove impurities such as stones, soil, iron pieces, etc. from the wood shaving fiber mixture. In one example, the second air flow sorting apparatus may comprise an air flow sorter. In the sizing step, the air flow sorted wood shaving fiber mixture is sized to produce a surface layer material.

According to an exemplary embodiment of the present invention, in the above sizing step, the applied adhesive may comprise an isocyanate glue, such as an MDI isocyanate glue.

The method for manufacturing the wood wool fiber composite board according to the invention may further comprise the following steps:

sizing a surface material: quantitatively inputting the wood shaving fiber mixture into a surface sizing system, and applying an adhesive according to a preset sizing proportion to obtain the sized wood shaving fiber. In an exemplary embodiment of the present invention, the adhesive applied is an isocyanate glue, such as MDI glue, which ensures zero formaldehyde emission from the manufactured wood shaving fiber composite board because the isocyanate glue is an aldehyde-free glue. Advantageously, the amount of isocyanate glue applied is between 3.0% and 5.0% by weight of the wood strands fibre mixture to be glued.

Material distribution: the uniformly glued wood shaving fiber mixture is equally divided into an upper surface material and a lower surface material by a distributor.

Sizing the core layer material: and (4) inputting qualified wood shaving materials into a core layer gluing system for gluing. As an example, the qualified wood 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 wood shaving material is uniformly mixed with the adhesive thrown out by a centrifugal atomizer rotating at a high speed in a closed roller. The adhesive may also be an isocyanate glue, such as an MDI glue, for example, the isocyanate glue may be applied at a level of from 2.0% to 4.0% by weight of the wood strands standard to be sized.

The inventor finds that because the wood shaving fiber mixture and the qualified wood shaving material meeting the size requirement can be used as the surface layer and the core layer only by strictly controlling the surface layer and the core layer, the application amount of the isocyanate glue can be controlled within the range of 3.0-5.0 percent (surface layer) and 2.0-4.0 percent (core layer), namely, the application amount of the isocyanate glue is greatly reduced, so that the manufacturing cost of the wood shaving fiber composite board can be reduced.

Paving: and paving the glued wood shaving fiber mixture (serving as a lower surface material), the glued wood shaving qualified material (serving as a core material) and the glued wood shaving fiber mixture (serving as an upper surface material) into a three-layer symmetrical-structure plate blank 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 homogenization, sanding and the like on the pressed rough board to obtain the wood shaving fiber composite board.

According to the requirements of national standard GB/T4897-2015 of particle boards; according to the test method of the physical and chemical properties of the artificial board and the veneer artificial board in GB/T17657-2013, the physical and chemical property indexes of the composite board manufactured according to the exemplary manufacturing method are compared with those of the corresponding comparative example as shown in the following table 2.

In table 2, this example is a composite board manufactured according to the above example of the present invention, comparative example 1 is a conventional particle board, and comparative example 2 is a conventional fiber board. According to the measured physical and chemical performance indexes, the physical and chemical performance indexes of the wood shaving fiber composite board manufactured by the manufacturing method disclosed by the embodiment of the invention meet the requirements of national standards, and most physical and chemical performance indexes (such as bonding strength and elastic modulus) are greatly higher than the national standards. In addition, the wood shaving fiber composite board manufactured according to the exemplary manufacturing method of the present invention has a significant improvement in the surface bonding strength, static bending strength, board surface nail holding power, and board edge nail holding power, compared to comparative examples 1 and 2, because: by using a mixture of fibres and shavings in the surface layer, the surface properties of the board are improved.

TABLE 2 comparison table of physical and chemical properties

According to an exemplary embodiment of the present invention, there is provided a shaving fiber composite board, as shown in fig. 2, which may include: an upper surface layer 21, the upper surface layer 21 comprising a mixture of wood shavings and fibres and an adhesive; a core layer 22, the core layer 22 comprising wood strands or flakes and an adhesive; and a lower surface layer 23, the lower surface layer 23 comprising a mixture of wood wool and fibers and a binder. Here, the shavings may comprise wood shavings and/or straw shavings; the fibers may include wood fibers and/or straw fibers; the adhesive may comprise an isocyanate glue. Wood strands and wood fibers are advantageously used as the main material of the wood strand fiber composite board. The weight percentage of the wood wool is 5-10%, for example 8%. The particle fiber composite board may be a particle fiber composite board manufactured according to the manufacturing method of the embodiment shown in fig. 1.

In the above-described shaving fiber composite board according to the present invention, the size distribution of the fibers may be: 0 to 1% by weight of a fiber having a fiber size of 5 mesh or more, 21 to 25% by weight of a fiber having a fiber size of 25 mesh or more and less than 5 mesh, 27 to 35% by weight of a fiber having a fiber size of 45 mesh or more and less than 25 mesh, 16 to 20% by weight of a fiber having a fiber size of 80 mesh or more and less than 45 mesh, 9 to 11% by weight of a fiber having a fiber size of 120 mesh or more and less than 80 mesh, and 14 to 25% by weight of a fiber having a fiber size of less than 120 mesh.

Advantageously, the size distribution of the fibers may be: 0.25% by weight of a fiber size of 5 mesh or more, 23% by weight of a fiber size of 25 mesh or more and less than 5 mesh, 27% by weight of a fiber size of 45 mesh or more and less than 25 mesh, 16.8% by weight of a fiber size of 80 mesh or more and less than 45 mesh, 9.5% by weight of a fiber size of 120 mesh or more and less than 80 mesh, and 23.45% by weight of a fiber size of less than 120 mesh.

In addition, the core layer 22 of the particleboard fiber composite panel according to the present invention may comprise a single layer core or a multiple layer core. For example, the core layer of the wood shaving fiber composite board as a single-layer core layer may comprise straw shavings, an adhesive and an auxiliary agent; alternatively, it may also contain wood strands, adhesives and auxiliaries. The auxiliary agent may include one or more of a fungicide, a water repellent, a tackifier, and the like, and of course, the auxiliary agent may not be added. The core layer of the wood wool fiber composite board, which is a multi-layer core layer including, for example, three layers, may include an upper core layer, a middle core layer, and a lower core layer, wherein each of the upper core layer, the middle core layer, and the lower core layer includes wood flakes or straw flakes, and wherein the wood flakes or straw flakes in the upper core layer may be arranged in a first predetermined direction, the wood flakes or straw flakes in the middle core layer may be arranged in a second predetermined direction, and the wood flakes or straw flakes in the lower core layer may be arranged in a third predetermined direction. The arrangement direction of the shavings in each layer can be arranged according to actual engineering requirements, and is not limited to the above-mentioned manner. For example, the wood shavings or straw shavings in the upper, middle and lower layers may be arranged in a same predetermined direction, or the wood shavings or straw shavings in the upper and lower layers may be arranged in a first predetermined direction, and the wood shavings or straw shavings in the middle layer may be arranged in a second predetermined direction. It should be noted that the first predetermined direction, the second predetermined direction and the third predetermined direction are not specific directions, but are only used to indicate different directions, and they may be perpendicular to each other or have any angle.

For example, the core layer may include: an adhesive accounting for 2-8 wt% of the core layer; an auxiliary agent accounting for 0-10 wt% of the core layer; and the balance wood shavings. The screening value of the core layer wood shavings is as follows: 60% -70% of wood shavings of minus 12 to plus 20 meshes, 8% -13% of wood shavings of minus 20 to plus 40 meshes and 2% -10% of wood shavings of minus 40 to plus 60 meshes; wherein, the percentage is the percentage of the wood shavings with corresponding meshes relative to the total weight of the wood shavings of the core layer.

For example, the core layer may include: an adhesive accounting for 2-6 wt% of the core layer; an auxiliary agent accounting for 0-10 wt% of the core layer; and the rest of straw shavings. The core layer straw shavings have the following screening values: 50% -60% of straw shavings of minus 12 meshes, 20% -30% of straw shavings of minus 12 meshes to plus 20 meshes, 5% -10% of straw shavings of minus 20 meshes to plus 40 meshes, and 5% -10% of straw shavings of minus 40 meshes to plus 60 meshes; wherein, the percentage is the percentage of the straw wood shavings with corresponding meshes relative to the total weight of the straw wood shavings of the core layer.

For another example, the core layer may include an upper core layer, a middle core layer, and a lower core layer, each of the upper core layer, the middle core layer, and the lower core layer including wood shavings, the wood shavings in the upper core layer being aligned in a first predetermined direction, and/or the wood shavings in the middle core layer being aligned in a second predetermined direction, and/or the wood shavings in the lower core layer being aligned in a third predetermined direction. The length of the wood shaving pieces on the upper layer of the core layer is 20-40 mm; and/or the length of the wood shavings at the lower layer of the core layer is 20-40 mm; and/or the length of the wood shaving pieces of the middle layer of the core layer is 50-60 mm. The mass ratio of the upper core layer to the middle core layer to the lower core layer is (0.8-1.2) to (0.8-1.2). For example, the wood flakes of the upper and lower core layers are aligned in the same direction and form an angle of orientation of 60 ° to 90 ° with the wood flakes of the middle core layer.

For another example, the core may include an upper core layer, a middle core layer, and a lower core layer, each of the upper core layer, the middle core layer, and the lower core layer including straw shavings, the straw shavings in the upper core layer being arranged in a first predetermined direction, and/or the straw shavings in the middle core layer being arranged in a second predetermined direction, and/or the straw shavings in the lower core layer being arranged in a third predetermined direction. The length of the straw chips on the upper layer of the core layer is 20-40 mm; and/or the length of the straw chips at the lower layer of the core layer is 20-40 mm; and/or the length of the straw chips in the middle layer of the core layer is 50-60 mm. For example, the wood flakes of the upper and lower core layers are aligned in the same direction and form an angle of orientation of 60 ° to 90 ° with the wood flakes of the middle core layer.

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 embodiments are merely specific examples of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention is defined by the claims.

Claims

1. A method for manufacturing a wood shaving fiber composite board is characterized by comprising the following steps:

preparing a fiber material: preparing the fiber material by using a composite board raw material;

preparing shaving materials: preparing the shaving material by using a composite board raw material;

preparing a core layer material: preparing the core layer material by using wood shavings or wood shavings material; and

preparing the wood shaving fiber composite board: and (3) paving, prepressing, hot-pressing and post-treating the core layer material and the surface layer material to obtain the wood shaving fiber composite board.

2. The method of manufacturing a particle fiber composite board as claimed in claim 1, wherein the composite board raw material includes wood and/or straw.

3. The method of manufacturing a particle fiber composite board according to claim 1 or 2,

the preparation of the fiber material comprises peeling and chipping wood, and washing, boiling and hot-grinding the chipped wood to obtain the fiber material,

or the preparation of the fiber material comprises the steps of chipping the straws, and washing, boiling and hot-grinding the chipped straws to prepare the fiber material.

4. A method of manufacturing a particle fibre composite board according to claim 1 or 2, characterised in that the fibre material has a size distribution of:

5. The method of manufacturing a particle fiber composite board as set forth in claim 4, wherein the fiber material has a size distribution of:

6. The method of manufacturing a particle fiber composite board according to claim 1 or 2, wherein the weight percentage of the particle material in the particle fiber mixture is 5-10%.

7. The method of manufacturing a particle fiber composite board according to claim 1 or 2, wherein the preparation of the particle material and the preparation of the core material comprise:

preparing wood shavings: chipping and slicing wood to produce the wood shavings;

screening wood shavings: conveying the wood shavings to a screening device to screen the wood shavings into shavings coarse material, shavings qualified material and shavings fine material, wherein the shavings fine material is used as the shavings material;

treating coarse wood shavings: refining the coarse wood shaving materials by utilizing refining equipment, and conveying the refined coarse wood shaving materials and the wood shavings to the screening equipment together so as to further screen the refined coarse wood shaving materials; and

and preparing the core layer material by using the qualified shaving material.

8. The method of manufacturing a particle fiber composite board of claim 7,

the step of preparing the core layer material by using the qualified wood shaving material comprises the following steps:

conveying the qualified shaving material to a first airflow sorting device for airflow sorting; and

applying glue to the qualified shaving material subjected to air flow separation to prepare the core layer material,

and/or the preparation of the surface material by the wood wool fiber mixture comprises the following steps:

conveying the wood shaving fiber mixture to a second air flow separation device for air flow separation; and

and gluing the wood shaving fiber mixture subjected to air flow separation to prepare the surface layer material.

9. The method of manufacturing a particle fiber composite board according to claim 7 or 8, wherein the screening device comprises a square or bar screen that screens the wood particles into wood particle coarse material, wood particle qualified material and wood particle fine material.

10. The method of manufacturing a particle fiber composite board according to claim 9, wherein the first layer of the square mesh screen has a pore size in a range of 8mm x 8mm to 12mm x 12mm, and the second layer of the square mesh screen has a pore size in a range of 0.2mm x 0.2mm to 0.5mm x 0.5 mm; the aperture of the first layer of screen mesh of the strip-shaped screen is in the range of 3mm multiplied by 30 mm-4 mm multiplied by 40mm, and the aperture of the second layer of screen mesh of the strip-shaped screen is in the range of 0.1mm multiplied by 0.8 mm-0.3 mm multiplied by 1.2 mm.

11. The method of making a particle-fiber composite board of claim 8, wherein in the sizing step, the adhesive applied comprises an isocyanate glue.

12. The method of manufacturing a particle fiber composite board according to claim 11, wherein in the step of sizing the particle-containing material subjected to air classification to produce the core material, the isocyanate glue is applied in an amount of 2.0% to 4.0% by weight of the particle-containing material to be sized:

13. The method of manufacturing a particle fiber composite board of claim 7, further comprising:

drying the strands of wood prior to conveying the strands of wood to a screening apparatus;

and/or drying the fiber material before conveying the fiber material to the second air flow sorting device.

14. Method for manufacturing a particle fibre composite board according to any of the claims 1-12, wherein the step of preparing the particle fibre composite board comprises:

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.

15. A particle fiber composite board, characterized in that it is a particle fiber composite board manufactured according to the manufacturing method of any one of the preceding claims 1-14.

16. A wood wool fiber composite board, comprising:

an upper skin layer, the upper skin layer comprising: a mixture of wood shavings and fibers, and an adhesive;

17. The wood wool fiber composite board of claim 16, wherein the wood wool comprises wood wool and/or straw wool; the fibers comprise wood fibers and/or straw fibers; and/or the adhesive comprises an isocyanate adhesive.

18. The particle fiber composite board of claim 16, wherein the fibers have a size distribution of:

19. The particle fiber composite board of claim 18, wherein the fibers have a size distribution of:

20. The wood wool fiber composite board according to any one of claims 16-19, wherein the weight percentage of the wood wool in the mixture of wood wool and fiber is 5-10%.

21. The wood wool fiber composite board of any one of claims 16 to 20,

the core layer includes: straw shavings, an adhesive, and an auxiliary agent; or,

the core layer includes: wood shavings, adhesive, and adjuvant; or,

the sandwich layer includes sandwich layer upper strata, sandwich layer intermediate level and sandwich layer lower floor, the sandwich layer upper strata the sandwich layer intermediate level with each in the sandwich layer lower floor all includes timber sliced sheet or straw sliced sheet, timber sliced sheet or straw sliced sheet in the sandwich layer upper strata are arranged according to first predetermined direction, and/or timber sliced sheet or straw sliced sheet in the sandwich layer intermediate level are arranged according to second predetermined direction, and/or timber sliced sheet or straw sliced sheet in the sandwich layer lower floor are arranged according to the third predetermined direction.