CN115488985A - Method for manufacturing formaldehyde-free artificial board made of eucalyptus bark - Google Patents
Method for manufacturing formaldehyde-free artificial board made of eucalyptus bark Download PDFInfo
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- CN115488985A CN115488985A CN202211150369.1A CN202211150369A CN115488985A CN 115488985 A CN115488985 A CN 115488985A CN 202211150369 A CN202211150369 A CN 202211150369A CN 115488985 A CN115488985 A CN 115488985A
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- eucalyptus bark
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- eucalyptus
- artificial board
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 244000166124 Eucalyptus globulus Species 0.000 title description 105
- 239000002245 particle Substances 0.000 claims abstract description 84
- 239000003292 glue Substances 0.000 claims abstract description 57
- 238000005507 spraying Methods 0.000 claims abstract description 38
- 238000007731 hot pressing Methods 0.000 claims abstract description 24
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 239000011259 mixed solution Substances 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 241000219927 Eucalyptus Species 0.000 claims abstract 27
- 238000010298 pulverizing process Methods 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 19
- 238000003825 pressing Methods 0.000 claims description 13
- 238000005520 cutting process Methods 0.000 claims description 11
- 238000001723 curing Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 abstract description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000002023 wood Substances 0.000 description 9
- 239000004575 stone Substances 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000000889 atomisation Methods 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 229920005610 lignin Polymers 0.000 description 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 235000004692 Eucalyptus globulus Nutrition 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L97/00—Compositions of lignin-containing materials
- C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
-
- 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
- B27N3/002—Manufacture of substantially flat articles, e.g. boards, from particles or fibres characterised by the type of binder
-
- 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
- B27N3/007—Manufacture of substantially flat articles, e.g. boards, from particles or fibres and at least partly composed of recycled 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
- B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
Abstract
The invention discloses a method for manufacturing a formaldehyde-free artificial board made of eucalyptus bark, which comprises the following steps: the method comprises the steps of crushing a eucalyptus bark raw material into particles to obtain eucalyptus bark particles, spraying a mixed solution of MDI glue, zinc stearate and missible oil into the eucalyptus bark particles, wherein the weight of the MDI glue is 3.5-4% of that of the eucalyptus bark particles, and the weight of the mixed solution of the zinc stearate and the missible oil is 4-7% of that of the eucalyptus bark particles, spraying the glue, stirring and mixing uniformly, paving, prepressing and hot-pressing to obtain the artificial board. The invention provides a method for manufacturing a formaldehyde-free artificial board made of eucalyptus bark, which takes the eucalyptus bark as a raw material, utilizes the excellent fiber structure characteristics of the eucalyptus bark, and combines specific technological processes of glue spraying, mixing, hot pressing and the like to prepare the formaldehyde-free artificial board made of the eucalyptus bark, and simultaneously saves resources and protects the environment.
Description
Technical Field
The invention relates to the technical field of formaldehyde-free artificial boards, in particular to a method for manufacturing a eucalyptus bark formaldehyde-free artificial board.
Background
Eucalyptus is mainly used in industries such as papermaking, artificial boards, solid wood furniture and the like in China. With the rapid development of various industries, the market demand of wood is continuously increased, and the wood without bark of eucalyptus trunks is widely used as a raw material for manufacturing shaving boards, density boards and various plywood after being processed, but a large amount of eucalyptus bark is generated in the processing process. At present, the traditional mode for treating the eucalyptus bark mainly comprises on-site abandoning, burning or landfill, and the like, which not only causes huge waste of resources, but also seriously pollutes the environment.
Disclosure of Invention
In view of the problems of resource waste and serious environmental pollution caused by the existing eucalyptus bark mainly discarded, burned or buried on site, the invention provides a method for manufacturing a formaldehyde-free artificial board made of eucalyptus bark.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
a method for manufacturing a formaldehyde-free artificial board made of eucalyptus bark comprises the following steps: crushing a eucalyptus bark raw material into particles to obtain eucalyptus bark particles; spraying mixed solution of MDI glue, zinc stearate and missible oil into the eucalyptus bark particles, wherein the weight of the MDI glue is 3.5-4% of that of the eucalyptus bark particles, and the weight of the mixed solution of the zinc stearate and the missible oil is 4-7% of that of the eucalyptus bark particles, spraying the glue, stirring and mixing uniformly, paving, prepressing and hot-pressing to obtain the artificial board.
The MDI glue is adopted in the glue spraying process, formaldehyde is not added, and the MDI glue has strong polarity and activity and can react with cellulose, lignin and moisture in eucalyptus bark, so that the artificial board prepared by the MDI glue has high strength and good water resistance. Meanwhile, the added zinc stearate and missible oil mixed solution does not contain formaldehyde, so that the prepared artificial board does not have the problem that the released formaldehyde harms human health.
According to one aspect of the invention, the water content of the raw material is controlled to be 20-25% before the eucalyptus bark is crushed.
According to one aspect of the invention, the eucalyptus bark particles are 0.5 to 5mm in size.
According to one aspect of the present invention, the pulverization includes coarse pulverization and fine pulverization, wherein the coarse pulverization is to pulverize the eucalyptus bark to a length of 27-33mm, and the coarsely pulverized eucalyptus bark is dried, and after removing impurities, is finely pulverized to a size of 0.5-5mm.
According to one aspect of the invention, the coarsely crushed eucalyptus bark is dried to a moisture content of between 13-15%.
The water content of the eucalyptus bark is controlled before the eucalyptus bark is crushed, the eucalyptus bark is crushed in a coarse crushing and fine crushing mode, the water content is strictly controlled, the eucalyptus bark is fully crushed to obtain proper fineness, the bonding area of the eucalyptus bark, mixed liquid of MDI glue, zinc stearate and missible oil is fully increased, and the low-density artificial board is favorably prepared by combining an atomization glue spraying process capable of reducing glue application amount.
According to one aspect of the invention, the cross section of the paved material blank is in a three-layer form of large particles in the middle and small particles on the outer side.
In accordance with one aspect of the invention, the density deviation of the green compact is required to be less than 8%.
According to one aspect of the invention, the pre-compaction has a pre-compaction pressure of 0.3Mpa.
According to one aspect of the invention, the hot pressing is carried out at a temperature of 180 ℃ and a face pressure of 2 to 4MPa.
The product performance can be more stable and is not easy to deform by precisely controlling parameters such as density deviation, temperature, surface pressure and the like in the paving, prepressing and hot pressing processes.
According to one aspect of the invention, after hot pressing, the hot pressing further comprises post-treatment, and the post-treatment comprises edge cutting, cooling, curing and sanding.
The implementation of the invention has the advantages that: the invention provides a preparation method which takes eucalyptus bark generated in eucalyptus wood processing as a raw material, utilizes the excellent fiber structure characteristics of the eucalyptus bark, combines the specific process procedures of raw material preparation, glue spraying and mixing, hot pressing and the like, can reduce the glue application amount, prepares a formaldehyde-free eucalyptus bark artificial board, and realizes the large-scale production of the eucalyptus bark formaldehyde-free artificial board. The invention utilizes the eucalyptus bark waste generated in the eucalyptus wood processing, saves resources and protects the environment.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of the manufacturing method of the eucalyptus bark formaldehyde-free artificial board.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a method for manufacturing a formaldehyde-free artificial board made of eucalyptus bark comprises the following steps: the method comprises the steps of crushing a eucalyptus bark raw material into particles to obtain eucalyptus bark particles, spraying a mixed solution of MDI glue, zinc stearate and missible oil into the eucalyptus bark particles, wherein the weight of the MDI glue is 3.5-4% of that of the eucalyptus bark particles, and the weight of the mixed solution of the zinc stearate and the missible oil is 4-7% of that of the eucalyptus bark particles, spraying the MDI glue, stirring and mixing uniformly, paving, prepressing and hot-pressing to obtain the artificial board. Specifically, glue can be sprayed through the intelligent glue spraying device, the glue spraying amount is controlled according to the corresponding weight, and meanwhile, the atomized spray heads spray particles smaller than 5 microns into the stirrer to be fully stirred, so that intelligent control is realized. The atomized glue spraying is adopted, the atomization strength control of the sprayed glue is combined, the glue is uniformly applied, the contact area of glue drops and the surface of the raw material is increased, the physical and mechanical properties of the artificial board can be improved, and the quality of the artificial board is reliably guaranteed. The intelligent glue spraying device can be controlled by software, such as Shanghai Kangbai system control software (V1.0), copyright registration number: 2019SR0861188.
The MDI glue is adopted in the glue spraying process, so that no formaldehyde is added, and the MDI glue has strong polarity and activity and can react with cellulose, lignin and moisture in eucalyptus bark, so that the artificial board prepared by using the MDI glue has high strength and good water resistance. Meanwhile, the added zinc stearate and missible oil mixed solution does not contain formaldehyde, so that the prepared artificial board does not have the problem that the released formaldehyde harms human health.
Preferably, the water content of the raw material is controlled to be 20-25% before the eucalyptus bark is crushed. The size of the eucalyptus bark particles is 0.5-5mm. Further, the crushing comprises coarse crushing and fine crushing, wherein the coarse crushing is to crush the eucalyptus bark to the length of 27-33mm, and the coarse crushed eucalyptus bark is dried, subjected to impurity removal and then finely crushed to the size of 0.5-5mm. Specifically, the eucalyptus bark after coarse crushing is dried until the water content is between 13 and 15 percent.
The water content of the eucalyptus bark is controlled before the eucalyptus bark is crushed, the eucalyptus bark is subjected to coarse crushing and fine crushing, the water content is strictly controlled, the eucalyptus bark is fully crushed to obtain proper fineness, and the joint area of the eucalyptus bark, MDI glue, zinc stearate and missible oil mixed liquid is fully increased.
Preferably, the cross section of the paved material blank is in a three-layer shape with large particles in the middle and small particles at the outer side. The density deviation of the green body is required to be less than 8%.
Preferably, the pre-pressing face pressure of the pre-pressing is 0.3Mpa. The hot pressing temperature is 180 ℃ and the surface pressure is 2-4Mpa. The hot pressing device is characterized by further comprising post-treatment, wherein the post-treatment comprises edge cutting, cooling, health preserving and sanding.
The following are specific examples.
Example 1
The collected eucalyptus bark is naturally dried until the water content is within the range of 20% -25%, and then is crushed. The pulverizing step comprises coarse pulverizing and fine pulverizing, wherein the coarse pulverizing step comprises pulverizing Eucalyptus globulus bark into 30mm pieces by blade pulverizer. Drying the coarse crushed eucalyptus bark by a roller dryer to control the water content to be 14%. The dried eucalyptus bark particles are processed by a deironing machine and a stone removing machine to remove iron and stones in the eucalyptus bark particles, and then the eucalyptus bark particles enter a hammer piece crusher to be crushed into particles with the size of 0.5-5mm. At this time, the eucalyptus bark particles are conveyed to a bin to wait for entering the next plate making section.
The gum spraying method comprises the following steps of weighing eucalyptus bark particles in a storage bin before glue spraying, monitoring the water content of the eucalyptus bark particles through a moisture tester, spraying glue by using a glue spraying device after the particles are sent into a stirrer, controlling the glue spraying amount according to the corresponding weight, and spraying a mixed solution of MDI glue accounting for 3.5% of the weight of the particles, zinc stearate accounting for 4% of the weight of the particles and missible oil into the stirrer through an atomizing nozzle in a particle size smaller than 5 mu m for fully stirring.
The stirred eucalyptus bark particles directly enter a paving machine for grading paving. The cross section of the material blank paved by the grading paving machine is in a three-layer form with large particles in the middle and small particles outside, and the density deviation of the material blank is required to be less than 8%.
And continuously pre-pressing the paved material blank by a roller type pre-press, wherein the pressure of a pre-pressing surface is about 0.3Mpa, so that the material blank reaches a certain process thickness and a relatively stable state.
And cutting the pre-pressed blank by a cross cutting machine, conveying the cut blank to a hot press, hot-pressing at the temperature of 180 ℃ and under the surface pressure of 2.5Mpa, and curing the blank into a rough board after the hot-pressing time of 460 seconds.
And sawing the formed rough board to the required size by an edge sawing machine, cooling, and curing for more than 48 hours under normal temperature and normal humidity conditions. And finally, sanding the eucalyptus bark artificial board to the required thickness by using a sanding machine to obtain the finished eucalyptus bark artificial board without formaldehyde.
Example 2
The collected eucalyptus bark is naturally dried until the water content is within the range of 20% -25%, and then is crushed. The pulverizing method comprises coarse pulverizing and fine pulverizing, wherein the coarse pulverizing is to pulverize eucalyptus bark into 30mm length by blade pulverizer. Drying the coarse crushed eucalyptus bark by a roller dryer to control the water content to be 14%. The dried eucalyptus bark particles are processed by a deironing machine and a stone removing machine to remove iron and stones in the eucalyptus bark particles, and then the eucalyptus bark particles enter a hammer piece crusher to be crushed into particles with the size of 0.5-5mm. At this time, the eucalyptus bark particles are conveyed to a bin to wait for entering the next plate making section.
The eucalyptus bark particles in the storage bin are weighed before glue spraying, the moisture content of the eucalyptus bark particles is monitored through a moisture tester, the particles are sent into a stirrer, glue spraying is carried out through a glue spraying device after the particles are sent into the stirrer, the glue spraying amount is controlled according to the corresponding weight, and in the process of continuous stirring, mixed liquid of MDI glue with the weight being 3.5% of the weight of the particles, zinc stearate with the weight being 4% of the weight of the particles and missible oil is sprayed into the stirrer through an atomizing nozzle in the form of particles smaller than 5 mu m to be fully stirred.
The stirred eucalyptus bark particles directly enter a paving machine for grading paving. The cross section of the material blank paved by the grading paving machine is in a three-layer shape with large particles in the middle and small particles outside, and the density deviation of the material blank is required to be less than 8%.
And continuously pre-pressing the paved material blank by a roller type pre-pressing machine, wherein the pressure of a pre-pressing surface is about 0.3Mpa, so that the material blank reaches a certain process thickness and a relatively stable state.
And cutting the pre-pressed blank by a cross cutting machine, conveying the cut blank to a hot press, hot-pressing at the temperature of 180 ℃ and under the surface pressure of 3.8Mpa, and curing the blank into a rough board after the hot-pressing time of 360 seconds.
And sawing the formed rough board to the required size by an edge sawing machine, cooling, and curing for more than 48 hours under the conditions of normal temperature and normal humidity. And finally, sanding the eucalyptus bark artificial board to the required thickness by using a sanding machine to obtain the finished eucalyptus bark artificial board without formaldehyde.
Example 3
The collected eucalyptus bark is naturally dried until the water content is within the range of 20% -25%, and then is crushed. The pulverizing method comprises coarse pulverizing and fine pulverizing, wherein the coarse pulverizing is to pulverize eucalyptus bark into 30mm length by blade pulverizer. Drying the coarse pulverized eucalyptus bark by a roller dryer to control the water content to be 14%. The dried eucalyptus bark particles are processed by a deironing machine and a stone removing machine to remove iron and stones in the eucalyptus bark particles, and then the eucalyptus bark particles enter a hammer piece crusher to be crushed into particles with the size of 0.5-5mm. At this time, the eucalyptus bark particles are conveyed to a bin to wait for entering the next plate making section.
The gum spraying method comprises the following steps of weighing eucalyptus bark particles in a storage bin before glue spraying, monitoring the water content of the eucalyptus bark particles through a moisture tester, spraying glue by using a glue spraying device after the particles are sent into a stirrer, controlling the glue spraying amount according to the corresponding weight, and spraying a mixed solution of MDI glue accounting for 3.5% of the weight of the particles, zinc stearate accounting for 4% of the weight of the particles and missible oil into the stirrer through an atomizing nozzle in a particle size smaller than 5 mu m for fully stirring.
The stirred eucalyptus bark particles directly enter a paving machine for grading paving. The cross section of the material blank paved by the grading paving machine is in a three-layer form with large particles in the middle and small particles outside, and the density deviation of the material blank is required to be less than 8%.
And continuously pre-pressing the paved material blank by a roller type pre-press, wherein the pressure of a pre-pressing surface is about 0.3Mpa, so that the material blank reaches a certain process thickness and a relatively stable state.
And cutting the pre-pressed blank by a cross cutting machine, conveying the cut blank to a hot press, hot-pressing at the temperature of 180 ℃ and under the surface pressure of 4Mpa, and curing the blank into a rough board after the hot-pressing time of 650 seconds.
And sawing the formed rough board to the required size by an edge sawing machine, cooling, and curing for more than 48 hours under normal temperature and normal humidity conditions. And finally, sanding the wood-based artificial board to the required thickness by using a sander to obtain a finished product of the eucalyptus bark formaldehyde-free artificial board.
Example 4
The collected eucalyptus bark is naturally dried until the water content is within the range of 20% -25%, and then is crushed. The pulverizing method comprises coarse pulverizing and fine pulverizing, wherein the coarse pulverizing is to pulverize eucalyptus bark into 30mm length by blade pulverizer. Drying the coarse pulverized eucalyptus bark by a roller dryer to control the water content to be 14%. The dried eucalyptus bark particles are processed by an iron remover and a stone remover to remove iron and stones, and then are crushed into 0.5-5mm by a hammer crusher. At this time, the eucalyptus bark particles are conveyed to a bin to wait for entering the next plate making section.
The eucalyptus bark particles in the storage bin are weighed before glue spraying, the moisture content of the eucalyptus bark particles is monitored through a moisture tester, the particles are sent into a stirrer, glue spraying is carried out through a glue spraying device after the particles are sent into the stirrer, the glue spraying amount is controlled according to the corresponding weight, and in the process of continuous stirring, mixed liquid of MDI glue with the weight being 4% of the weight of the particles, 7% of zinc stearate and missible oil is sprayed into the stirrer through an atomizing nozzle by particles smaller than 5 microns to be fully stirred.
The stirred eucalyptus bark particles directly enter a paving machine for grading paving. The cross section of the material blank paved by the grading paving machine is in a three-layer form with large particles in the middle and small particles outside, and the density deviation of the material blank is required to be less than 8%.
And continuously pre-pressing the paved material blank by a roller type pre-pressing machine, wherein the pressure of a pre-pressing surface is about 0.3Mpa, so that the material blank reaches a certain process thickness and a relatively stable state.
And cutting the pre-pressed blank by a cross cutting machine, conveying the cut blank to a hot press, hot-pressing at the temperature of 180 ℃ and under the surface pressure of 2.5Mpa, and curing the blank into a rough board after the hot-pressing time of 460 seconds.
And sawing the formed rough board to the required size by an edge sawing machine, cooling, and curing for more than 48 hours under the conditions of normal temperature and normal humidity. And finally, sanding the wood-based artificial board to the required thickness by using a sander to obtain a finished product of the eucalyptus bark formaldehyde-free artificial board.
The finished eucalyptus bark formaldehyde-free artificial boards prepared in example 1, example 2, example 3 and example 4 were subjected to physical and chemical performance tests (test method in accordance with GB/T4897-2015), and the test results are shown in table 1 below:
TABLE 1 results of Performance testing
As can be seen from the detection results, the eucalyptus bark artificial boards obtained in the embodiments 1 to 4 have formaldehyde-free performance, are safe and environment-friendly, and have high board strength and good water resistance. By reasonably setting parameters in the hot pressing process, the eucalyptus bark formaldehyde-free artificial board with low density and medium density can be manufactured.
The implementation of the invention has the advantages that: the invention provides a preparation method which takes eucalyptus bark generated in eucalyptus wood processing as a raw material, utilizes the excellent fiber structure characteristics of the eucalyptus bark, combines the specific process procedures of raw material preparation, glue spraying and mixing, hot pressing and the like, can reduce the glue application amount, prepares a formaldehyde-free eucalyptus bark artificial board, and realizes the large-scale production of the eucalyptus bark formaldehyde-free artificial board. The invention utilizes the eucalyptus bark waste generated in the eucalyptus wood processing, saves resources and protects the environment.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed herein should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A manufacturing method of a formaldehyde-free artificial board made of eucalyptus bark is characterized by comprising the following steps: the method comprises the steps of crushing a eucalyptus bark raw material into particles to obtain eucalyptus bark particles, spraying a mixed solution of MDI glue, zinc stearate and missible oil into the eucalyptus bark particles, wherein the weight of the MDI glue is 3.5-4% of that of the eucalyptus bark particles, the weight of the mixed solution of the zinc stearate and the missible oil is 4-7% of that of the eucalyptus bark particles, spraying the MDI glue, stirring and mixing uniformly, paving, prepressing and hot-pressing to obtain the artificial board.
2. The manufacturing method of the eucalyptus bark formaldehyde-free artificial board according to claim 1, wherein the water content of the raw material is controlled to be 20% -25% before the eucalyptus bark is crushed.
3. The method for manufacturing the formaldehyde-free artificial board made of eucalyptus bark according to claim 1, wherein the size of the particles of the eucalyptus bark is 0.5-5mm.
4. The method according to claim 1, wherein the pulverizing comprises coarse pulverizing and fine pulverizing, wherein the coarse pulverizing comprises pulverizing eucalyptus bark to a length of 27-33mm, drying the coarse pulverized eucalyptus bark, removing impurities, and fine pulverizing to a size of 0.5-5mm.
5. The method for manufacturing the formaldehyde-free artificial board made of eucalyptus bark as claimed in claim 1, wherein the coarsely pulverized eucalyptus bark is dried until the moisture content is 13-15%.
6. The method for manufacturing the formaldehyde-free artificial board made of eucalyptus bark according to claim 1, wherein the cross section of the paved material blank is in a three-layer shape of large particles in the middle and small particles on the outer side.
7. The method for manufacturing the formaldehyde-free artificial board made of eucalyptus bark as claimed in claim 6, wherein the density deviation of the blank is less than 8%.
8. The method according to any one of claims 1 to 7, wherein the pre-pressing pressure is 0.3MPa.
9. The method for manufacturing the formaldehyde-free artificial board made of eucalyptus bark as claimed in claim 8, wherein the hot pressing temperature is 180 ℃ and the surface pressure is 2-4Mpa.
10. The method as claimed in claim 9, further comprising a post-treatment after the hot pressing, wherein the post-treatment comprises edge cutting, cooling, curing and sanding.
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