CN114571571B - Production method of environment-friendly density board - Google Patents

Production method of environment-friendly density board Download PDF

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Publication number
CN114571571B
CN114571571B CN202210314860.7A CN202210314860A CN114571571B CN 114571571 B CN114571571 B CN 114571571B CN 202210314860 A CN202210314860 A CN 202210314860A CN 114571571 B CN114571571 B CN 114571571B
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filling
density board
gap
hot
interstitial
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CN114571571A (en
Inventor
李洋
李正明
李维刚
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Jiangsu Sulin Wood Industry Co ltd
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Jiangsu Sulin Wood Industry Co ltd
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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
    • B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • B27L11/08—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood fibres, e.g. produced by tearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
    • B27M1/08—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by multi-step processes
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/12—Moulding of mats from fibres
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

The invention discloses a production method of an environment-friendly density board, which belongs to the technical field of density board production, and can realize that a plurality of uniformly distributed gap-filling belts are pre-embedded in a paving process in the production process of the density board, then a pre-pressing process is carried out, the combination effect between the gap-filling belts and the density board is improved, and the gap-filling action of the gap-filling belts is triggered in a final hot-pressing process, specifically, the gap-filling microspheres are melted under the action of high temperature, and powder is carried to the existing pores to flow and fill under the extrusion action, so that the purpose of eliminating the pores is achieved, and the residual gap-filling microspheres can be reserved on the density board to play a role of improving the strength.

Description

Production method of environment-friendly density board
Technical Field
The invention relates to the technical field of density board production, in particular to a production method of an environment-friendly density board.
Background
The density board is called as density fiber board, and is one kind of board produced with wood fiber or other plant fiber as material and through fiber preparation, applying synthetic resin, heating and pressurizing.
They are classified into high-density fiberboard, medium-density fiberboard and low-density fiberboard according to their density. The density board has the advantages of uniform structure, fine material, stable performance, impact resistance and easy processing, and is widely applied to domestic furniture, decoration, musical instruments, packaging and the like.
The existing density board is subjected to a process of compression molding when being processed, but because of the irregularity of raw materials, part of pores are inevitably generated in the compression process, so that the strength of the density board is reduced, the condition that the density distribution of the density board is uneven is easily caused, and the application of the density board is limited.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a production method of an environment-friendly density board, which can realize that a plurality of uniformly distributed gap-filling clamp belts are pre-embedded in a paving process in the production process of the density board, then a pre-pressing process is carried out, the combination effect between the gap-filling clamp belts and the density board is improved, and the gap-filling action of the gap-filling clamp belts is triggered in a final hot-pressing process, specifically, the gap-filling microspheres are melted under the action of high temperature, and powder is carried to flow and fill the existing pores under the action of extrusion, so that the purpose of eliminating the pores is achieved, and the residual microspheres can be reserved on the density board to play a role of improving the strength.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
The production method of the environment-friendly density board comprises the following steps:
s1, slicing a wood raw material to obtain wood chips, and cleaning the wood chips to remove impurities;
s2, putting the wood chips into a vertical cooking cylinder for cooking and fully softening, and then, putting the wood chips into a thermomechanical mill for grinding into fibers;
s3, drying the fibers until the moisture content is lower than 8%, and then fully mixing the adhesive with the fibers in a strong airflow adhesive spraying manner to obtain a blank;
s4, paving the blank in the template twice, uniformly embedding a plurality of gap-filling entrainment strips in the middle, and prepressing after paving to obtain a blank plate;
and S5, sending the blank plate into a hot press for hot pressing, triggering the gap filling action of the gap filling belt to obtain a semi-finished product, and sanding and cutting the semi-finished product to obtain the density plate.
Further, in the step S2, the steam pressure in the cooking cylinder is 0.6-0.75MPa, the temperature is 145-155 ℃, and the time is 1-5min.
Further, the pressure of the grinding chamber of the hot grinding mill in the step S2 is 0.4-0.65MPa, and the temperature is 130-145 ℃.
Further, the mass ratio of the adhesive to the fibers in the step S3 is 1.
Further, the hot pressing temperature in the step S5 is 150-170 ℃, and the hot pressing pressure is 2.5-3.5MPa.
Furthermore, the gap-filling band comprises a pair of plastic strips, a plurality of gap-filling microspheres and a plurality of external fiber bundles, wherein the gap-filling microspheres are uniformly connected between the pair of plastic strips, the external fiber bundles are uniformly distributed on one end surface of the plastic strip away from the gap-filling microspheres, the plastic strip has a positioning effect on the gap-filling microspheres, large offset is not easy to occur in the pressing process, and meanwhile, the plastic strip can be well combined with the density board by utilizing the extension characteristic of the external fiber bundles, so that the crack resistance of the density board is improved.
Further, the interstitial microsphere includes outer hot melt layer, interior enhancement ball core and a plurality of filler particles, outer hot melt layer cladding is in interior enhancement ball core surface, filler particles evenly inlays on outer hot melt layer, outer hot melt layer is the solid form under normal condition, carries out good carrying and dispersion to filler particles, receives high temperature to influence and takes place to melt the phenomenon when the hot pressing to carry filler particles under the pressure effect and flow to hole department, thereby pack the hole gap, and utilize mutual magnetic attraction between the filler particles, can further improve suppression and filling effect, interior enhancement ball core then finally reserves and is used for improving bulk strength in the density board.
Furthermore, the outer hot-melting layer is made of hot-melting resin materials, and the melting point of the outer hot-melting layer is lower than the hot-pressing temperature.
Further, the inner reinforcing ball core is made of hard materials, the diameter of the inner reinforcing ball core is not less than one half of the thickness of the density board, the diameter of the interstitial microspheres is less than the thickness of the density board, the inner reinforcing ball core needs to have enough size to improve the strength of the density board, the inner reinforcing ball core is excessively large to cause the effect of compression molding, the over-small strength causes limited strength improvement, the over-thick inner reinforcing ball core easily causes poor filling compactness, and the over-thin inner reinforcing ball core easily causes poor flowability and is difficult to carry filling particles for migration.
Furthermore, the filling particles are prepared by mixing starch and magnetic particles, and are obtained by drying, pressing and molding after starch aqueous solution and iron powder are uniformly mixed, wherein the magnetic particles are used for endowing the filling particles with magnetism, so that the density board is more compact in the pressing process, especially in the horizontal direction, and meanwhile, the starch has a good filling effect and can be cracked to generate smaller particles or powder under the extrusion effect, thereby adapting to different pores to achieve the purpose of filling.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) The scheme can realize that a plurality of gap-filling belts which are uniformly distributed are pre-embedded in the paving process in the production process of the density board, then the pre-pressing process is carried out, the combination effect between the gap-filling belts and the density board is improved, the gap-filling action of the gap-filling belts is triggered in the final hot-pressing process, specifically, the gap-filling microspheres are melted under the high-temperature action, and powder is carried to flow and fill the existing pores under the extrusion action, so that the purpose of eliminating the pores is achieved, the residual gap-filling microspheres can be reserved on the density board to improve the strength, and compared with the existing density board, the porosity of the density board produced by the method is obviously reduced, the density distribution is more uniform, and the mechanical strength is obviously improved.
(2) The gap-filling belt comprises a pair of plastic strips, a plurality of gap-filling microspheres and a plurality of external fiber bundles, the gap-filling microspheres are uniformly connected between the pair of plastic strips, the external fiber bundles are uniformly distributed on one end surface of the plastic strip away from the gap-filling microspheres, the plastic strips play a role in positioning the gap-filling microspheres, large deviation is not easy to occur in the pressing process, and meanwhile the plastic strips can be well combined with the density board by utilizing the extension characteristic of the external fiber bundles, so that the crack resistance of the density board is improved.
(3) The interstitial microballon includes outer hot melt layer, interior enhancement ball core and a plurality of filler, outer hot melt layer cladding is strengthened ball core surface in, the filler is evenly inlayed on outer hot melt layer, outer hot melt layer is the solid form under normal condition, carry out good carrying and dispersion to the filler, receive the high temperature influence and take place the melting phenomenon when the hot pressing, and carry the filler to the pore department flows under the pressure effect, thereby fill the pore, and utilize mutual magnetic attraction between the filler, can further improve suppression and filling effect, interior enhancement ball core then finally reserves and is used for improving the bulk strength in the density board.
(4) Interior enhancement ball core adopts hard material to make, the diameter of interior enhancement ball core is not less than the half of density board thickness, the diameter of interstitial microballon is less than density board thickness, interior enhancement ball core need have sufficient size to improve the intensity of density board, too big result in compression moulding's effect, the undersize leads to intensity to promote limitedly, and interior enhancement ball core is too thick leads to filling closely knit degree not good easily, leads to mobility relatively poor and be difficult to carry the packing particle to move easily.
(5) The filling particles are prepared by mixing starch and magnetic particles, and are obtained by uniformly mixing a starch water solution and iron powder and then drying and pressing the mixture, the magnetic particles are used for endowing the filling particles with magnetism, the density board is more compact in the pressing process under the mutual magnetic attraction effect, and particularly in the horizontal direction, the starch has a good filling effect and can be cracked to generate smaller particles or powder under the extrusion effect, so that the filling particles are suitable for different pores to achieve the purpose of filling.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic structural view of the present invention during pre-pressing;
FIG. 3 is a schematic structural diagram of the interstitial clip belt of the present invention;
FIG. 4 is a schematic structural diagram of a normal state of the interstitial microspheres of the present invention;
FIG. 5 is a schematic structural diagram of the interstitial microspheres of the present invention in a molten state;
FIG. 6 is a schematic view of the structure of the filler particles of the present invention.
The numbering in the figures illustrates:
1 plastic strip, 2 gap filling microsphere, 21 outer hot melt layer, 22 inner reinforced ball core, 23 filling particle and 3 outer fiber bundle.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is to be understood that the embodiments described are merely exemplary embodiments, rather than exemplary embodiments, and that all other embodiments may be devised by those skilled in the art without departing from the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "fitted/connected", "connected", and the like, are to be interpreted broadly, such as "connected", which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Example (b):
referring to fig. 1-2, a method for manufacturing an environmentally friendly density board includes the following steps:
s1, slicing a wood raw material to obtain wood chips, and cleaning the wood chips to remove impurities;
s2, putting the wood chips into a vertical cooking cylinder for cooking and fully softening, and then putting the wood chips into a thermomechanical grinding machine for grinding into fibers;
s3, drying the fibers until the water content is lower than 8%, and fully mixing the adhesive with the fibers in a strong airflow glue spraying manner to obtain a blank;
s4, paving the blank in the template twice, uniformly embedding a plurality of gap-filling entrainment strips in the middle, and prepressing after paving to obtain a blank plate;
and S5, sending the blank plate into a hot press for hot pressing, triggering the gap filling action of the gap filling belt to obtain a semi-finished product, and sanding and cutting the semi-finished product to obtain the density plate.
In the step S2, the steam pressure in the cooking cylinder is 0.6-0.75MPa, the temperature is 145-155 ℃, and the time is 1-5min.
In step S2, the pressure of the grinding chamber of the heat grinder is 0.4-0.65MPa, and the temperature is 130-145 ℃.
In the step S3, the mass ratio of the adhesive to the fibers is 1.
The hot pressing temperature in the step S5 is 150-170 ℃, and the hot pressing pressure is 2.5-3.5MPa.
Referring to fig. 3, the interstitial clip includes a pair of plastic strips 1, a plurality of interstitial microspheres 2 and a plurality of external fiber bundles 3, the interstitial microspheres 2 are uniformly connected between the pair of plastic strips 1, the plurality of external fiber bundles 3 are uniformly distributed on one end surface of the plastic strip 1 away from the interstitial microspheres 2, the plastic strip 1 has a positioning effect on the interstitial microspheres 2, large offset is not easy to occur in a pressing process, and the plastic strip 1 can be well combined with a density board by utilizing the extension characteristics of the external fiber bundles 3, so that the crack resistance of the density board is improved.
Referring to fig. 4-6, the gap-filling microsphere 2 includes an outer hot-melt layer 21, an inner reinforcing core 22 and a plurality of filler particles 23, the outer hot-melt layer 21 covers the outer surface of the inner reinforcing core 22, the filler particles 23 are uniformly embedded in the outer hot-melt layer 21, the outer hot-melt layer 21 is in a solid state in a normal state, the filler particles 23 are well carried and dispersed, the filler particles 23 are influenced by high temperature during hot pressing to generate a melting phenomenon, and the filler particles 23 are carried to flow to the pores under the action of pressure, so as to fill the pores, and the pressing and filling effects can be further improved by using the mutual magnetic attraction between the filler particles 23, and the inner reinforcing core 22 is finally reserved in the density plate to improve the overall strength.
The outer hot-melt layer 21 is made of a hot-melt resin material, and the melting point of the outer hot-melt layer 21 is lower than the hot-pressing temperature.
The inner reinforcing ball core 22 is made of hard materials, the diameter of the inner reinforcing ball core 22 is not less than one half of the thickness of the density board, the diameter of the gap filling microspheres 2 is less than the thickness of the density board, the inner reinforcing ball core 22 needs to have enough size to improve the strength of the density board, the inner reinforcing ball core 22 is too large to cause the effect of compression molding, the over-small causes the limited strength improvement, the over-thick inner reinforcing ball core 22 easily causes the poor filling compactness, and the over-thin inner reinforcing ball core 22 easily causes the poor flowability and is difficult to carry the filling particles 23 for migration.
The filling particles 23 are made by mixing starch and magnetic particles, and are obtained by uniformly mixing a starch water solution and iron powder and then drying and pressing the mixture, wherein the magnetic particles are used for endowing the filling particles 23 with magnetism, so that the density board is more compact in the pressing process under the mutual magnetic attraction effect, particularly in the horizontal direction, the starch has a good filling effect, and the starch can be cracked to generate smaller particles or powder under the extrusion effect, so that the filling particles are adapted to different pores to achieve the purpose of filling.
The invention can realize that a plurality of uniformly distributed gap-filling entrainment bands are pre-embedded in the paving procedure in the production process of the density board, then the prepressing procedure is carried out, the combination effect between the gap-filling entrainment bands and the density board is improved, and the gap-filling action of the gap-filling entrainment bands is triggered in the final hot-pressing procedure, in particular, the gap-filling microspheres 2 are melted under the high-temperature action, and carry powder to flow and fill to the existing pores under the extrusion action, thereby achieving the purpose of eliminating the pores, and the residual gap-filling microspheres 2 can be reserved on the density board to play a role of improving the strength.
The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.

Claims (4)

1. The production method of the environment-friendly density board is characterized by comprising the following steps: the method comprises the following steps:
s1, slicing a wood raw material to obtain wood chips, and cleaning the wood chips to remove impurities;
s2, putting the wood chips into a vertical cooking cylinder for cooking and fully softening, and then putting the wood chips into a thermomechanical grinding machine for grinding into fibers;
s3, drying the fibers until the moisture content is lower than 8%, and then fully mixing the adhesive with the fibers in a strong airflow adhesive spraying manner to obtain a blank;
s4, paving the blank in the template twice, uniformly embedding a plurality of gap-filling entrainment strips in the middle, and prepressing after paving to obtain a blank plate;
s5, the blank plate is sent into a hot press to be hot-pressed, gap filling actions of gap filling entrainment are triggered to obtain a semi-finished product, and the semi-finished product is sanded and cut to obtain a density plate;
the steam pressure in the cooking cylinder in the step S2 is 0.6-0.75MPa, the temperature is 145-155 ℃, and the time is 1-5min;
the pressure of a grinding chamber of the hot grinding machine in the step S2 is 0.4-0.65MPa, and the temperature is 130-145 ℃;
in the step S3, the mass ratio of the adhesive to the fibers is 1;
the hot pressing temperature in the step S5 is 150-170 ℃, and the hot pressing pressure is 2.5-3.5MPa;
interstitial is smugglied including a pair of plastic strip (1), a plurality of interstitial microballon (2) and many and is involved tow (3) outward, and is a plurality of interstitial microballon (2) evenly connected is between a pair of plastic strip (1), many outward wade tow (3) evenly distributed is kept away from the terminal surface of interstitial microballon (2) in plastic strip (1), interstitial microballon (2) are including outer hot melt layer (21), interior reinforcing ball core (22) and a plurality of filler particle (23), outer hot melt layer (21) cladding is in interior reinforcing ball core (22) surface, filler particle (23) are evenly inlayed on outer hot melt layer (21).
2. The method for producing the environment-friendly density board as claimed in claim 1, wherein: the outer hot melting layer (21) is made of hot melting resin materials, and the melting point of the outer hot melting layer (21) is lower than the hot pressing temperature.
3. The method for producing the environment-friendly density board as claimed in claim 1, wherein: the inner reinforcing ball core (22) is made of hard materials, the diameter of the inner reinforcing ball core (22) is not less than one half of the thickness of the density plate, and the diameter of the interstitial microspheres (2) is less than the thickness of the density plate.
4. The method for producing the environment-friendly density board as claimed in claim 1, wherein: the filling particles (23) are prepared by mixing starch and magnetic particles, and are specifically obtained by uniformly mixing a starch water solution and iron powder and then drying and pressing the mixture.
CN202210314860.7A 2022-03-28 2022-03-28 Production method of environment-friendly density board Active CN114571571B (en)

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DE3540537A1 (en) * 1985-11-15 1987-05-21 Klaus Kurt Koelzer REINFORCEMENT MATERIAL
US5773121A (en) * 1994-07-29 1998-06-30 Isorca Inc. Syntactic foam core incorporating honeycomb structure for composites
JP2002515924A (en) * 1996-02-13 2002-05-28 アイソルカ、インコーポレイテッド Syntactic foam core material for composite structures
US7832983B2 (en) * 2006-05-02 2010-11-16 Goodrich Corporation Nacelles and nacelle components containing nanoreinforced carbon fiber composite material
PL2561127T3 (en) * 2010-04-22 2015-06-30 3M Innovative Properties Co Nonwoven nanofiber webs containing chemically active particulates and methods of making and using same
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CN103192442B (en) * 2013-04-23 2015-09-09 福江集团有限公司 A kind of production method of medium density fibre board (MDF)
CN105216086B (en) * 2015-09-02 2017-10-27 贵港市伟创木业有限公司 A kind of production method of low aldehyde medium density fibre board (MDF)
CN109537336A (en) * 2018-11-07 2019-03-29 上海昶法新材料有限公司 A kind of low aldehyde environmental protection density plate and preparation method thereof

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