CN101745946A - Preparation method of self-bonding bark board with three-layered structure - Google Patents
Preparation method of self-bonding bark board with three-layered structure Download PDFInfo
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- CN101745946A CN101745946A CN200910262001A CN200910262001A CN101745946A CN 101745946 A CN101745946 A CN 101745946A CN 200910262001 A CN200910262001 A CN 200910262001A CN 200910262001 A CN200910262001 A CN 200910262001A CN 101745946 A CN101745946 A CN 101745946A
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Abstract
The invention relates to a preparation method of a self-bonding bark board with a three-layered structure, in particular to a preparation method of a bark board. The invention solves the problems of low static bending strength, high hot-press forming temperature and long hot-press time existing in a self-bonding bark board prepared by the prior method. The preparation method comprises the following steps: firstly, hot grinding and activating a bark; secondly, hot grinding wood fiber; thirdly, paving a board blank; and fourthly, hot-press forming to obtain the self-bonding bark board with the three-layered structure. The density of the self-bonding bark board with the three-layered structure obtained by adopting the method is 9000-1100 kg/m3, the internal bonding strength is 1.09-1.85 MPa, and the static bending strength is 10.50-20.40 MPa.
Description
Technical field
The present invention relates to a kind of preparation method of Bark.
Background technology
Chow discloses a kind of self-bonding bark board (Chow S.Bark board withoutsynthetic resins.Forest Products Journal 1975,1975, Vol.25, No.11:32-37), but he adopts the bark powder (bark powder is 5 purpose screen clothes by the order number) of being ground by the Willey grinder to prepare Bark, prepared the self-bonding bark board that internal bond strength is 1.38MPa (200PSI) in 20 minutes in 300 ℃ of following hot pressing 5 minutes or 280 ℃ of hot pressing, but the MOR of Bark is very low, and its MOR is 13.1MPa (1900PSI).Troughton prepares at his yule logs plate and has mentioned a kind of self-bonding bark board (Troughton G.E. that adopts the bark scrap preparation in the patent, Chan K.L., Love K.G.Manufactureofhog fuel board.US Patent 5725818), its MOR is also very low, only is 1.2MPa～3.7MPa (175-536PSI) at the MOR of 5 minutes gained Barks of 300 ℃ of following hot pressing.
Summary of the invention
Technical problem to be solved by this invention is for low, hot-forming temperature height of MOR that solves the self-bonding bark board that adopts existing method preparation and the long problem of hot pressing time, and a kind of preparation method of self-bonding bark board with three-layered structure is provided.
The preparation method of self-bonding bark board with three-layered structure of the present invention is as follows: step 1, bark defibrator process activation: with moisture content is that 35%～75% bark adds in the defibrator, be that 130 ℃～195 ℃, pressure are that 0.1MPa～1.3MPa, defibrator abrasive disk space are that 0.08mm～1.1mm, defibrator speed of grinding plate are defibrator process 0.5 minute～6 minutes under 1000 rev/mins～2400 rev/mins the condition in temperature then, obtain the mixture of bark fiber and bark fines, then the mixture of bark fiber and bark fines being dried to moisture content is 3.5%～12%; Step 2, hot grinding wood fiber: with moisture content is that 40%～90% needlebush wood chip adds in the defibrator, be that 130 ℃～195 ℃, pressure are that 0.1MPa～1.3MPa, defibrator abrasive disk space are that 0.08mm～1.1mm, defibrator speed of grinding plate are defibrator process 1 minute～5 minutes under 1000 rev/mins～2400 rev/mins the condition in temperature then, obtain the softwood wood-fibred, the softwood wood-fibred being dried to moisture content then is 5%～10%; Step 3, plate embryo are mated formation: lay the thick moisture content of 3mm～30mm and be 5%～10% softwood wood-fibred on spreading machine, laying the thick moisture content of 15mm～100mm at softwood wood-fibred upper surface then is 3.5%～12% the bark fiber and the mixture of bark fines, lay the thick softwood wood-fibred of 3mm～30mm at the mixture upper surface of bark fiber and bark fines again, forming bottom is that softwood wood-fibred, sandwich layer are the mixture of bark fiber and bark fines, the three-decker plate embryo that the top layer is the softwood wood-fibred; Step 4, hot-forming: is hot pressing 5.25 minutes～20.75 minutes in 220 ℃～280 ℃ the heat pressing forming machines with the three-decker plate embryo of step 3 gained in temperature, promptly gets self-bonding bark board with three-layered structure; Hot-forming as follows described in the step 4: it is 220 ℃～260 ℃ heat pressing forming machines that the three-decker plate embryo of step 3 gained is put into temperature, under the pressure of 2.75MPa, kept 1 minute～1.5 minutes, in 15 seconds～45 seconds, unload then and be depressed into 0.1MPa～0.2MPa and kept 1 minute～1.5 minutes, boost to 1.0MPa～1.5MPa again and kept 1.5～15 minutes, be depressurized to 0.4MPa～0.6MPa then and kept 0.5 minute～1 minute, with 1 minute pressure is dropped to normal pressure more at last, promptly get self-bonding bark board with three-layered structure.
High humidity, high temperature, high pressure and the mechanical shear stress effect of the inventive method in defibrator process bark process, can make activation of component such as polysaccharide in the bark, lignin, be transformed into polymerizable and material gluing, that can substitute synthetic adhesive under the hot-forming condition of self-bonding bark board, thereby realize the no glue glued adhesion of Bark.Adopt the inventive method to adopt the defibrator process activation processing, obtain the activation bark fiber of easier no glue glued adhesion and the mixture of bark fines, from and be beneficial to the glue-joint strength (internal bond strength) that improves self-bonding bark board, shorten the hot pressing time of sheet material and reduce hot-forming temperature, thereby enhance productivity; Because the content of cellulose of wood-fibred is than the height of bark fiber and bark fines mixture, intensity height own and good heat resistance, so the three-decker plate embryo of the present invention's employing are laid the MOR that the wood-fibred layer helps improving self-bonding bark board on the top layer.
The density of the self-bonding bark board with three-layered structure that the inventive method obtains is 900kg/m
3～1100kg/m
3, internal bond strength is 1.09MPa～1.85MPa, MOR is 10.50MPa～20.40MPa.
The specific embodiment
Technical solution of the present invention is not limited to the following cited specific embodiment, also comprises any combination between each specific embodiment.
The specific embodiment one: the preparation method of self-bonding bark board with three-layered structure is as follows in the present embodiment: step 1, bark defibrator process activation: with moisture content is that 35%～75% bark adds in the defibrator, it is 130 ℃～195 ℃ in temperature then, pressure is 0.1MPa～1.3MPa, the defibrator abrasive disk space is 0.08mm～1.1mm, the defibrator speed of grinding plate is defibrator process 0.5 minute～6 minutes under 1000 rev/mins～2400 rev/mins the condition, obtain the mixture of bark fiber and bark fines, then the mixture of bark fiber and bark fines being dried to moisture content is 3.5%～12%; Step 2, hot grinding wood fiber: with moisture content is that 40%～90% needlebush wood chip adds in the defibrator, be that 130 ℃～195 ℃, pressure are that 0.1MPa～1.3MPa, defibrator abrasive disk space are that 0.08mm～1.1mm, defibrator speed of grinding plate are defibrator process 1 minute～5 minutes under 1000 rev/mins～2400 rev/mins the condition in temperature then, obtain the softwood wood-fibred, the softwood wood-fibred being dried to moisture content then is 5%～10%; Step 3, plate embryo are mated formation: lay the thick moisture content of 3mm～30mm and be 5%～10% softwood wood-fibred on spreading machine, laying the thick moisture content of 15mm～100mm at softwood wood-fibred upper surface then is 3.5%～12% the bark fiber and the mixture of bark fines, lay the thick softwood wood-fibred of 3mm～30mm at the mixture upper surface of bark fiber and bark fines again, forming bottom is that softwood wood-fibred, sandwich layer are the mixture of bark fiber and bark fines, the three-decker plate embryo that the top layer is the softwood wood-fibred; Step 4, hot-forming: is hot pressing 5.25 minutes～20.75 minutes in 220 ℃～280 ℃ the heat pressing forming machines with the three-decker plate embryo of step 3 gained in temperature, promptly gets self-bonding bark board with three-layered structure.
Present embodiment is taken out the gained self-bonding bark board from hot press after immediately the self-bonding bark board upper and lower surface respectively add a cover a breadth greater than (each periphery than the metallic plate of self-bonding bark board of the big 0.5cm of Bark～5cm) (to reduce self-bonding bark board plate embryo surface temperature, and the self-bonding bark board surface in air that prevents heat is oxidized), be cooled to normal temperature, take out self-bonding bark board.
The self-bonding bark board density of present embodiment gained is 900kg/m
3～1100kg/m
3, internal bond strength is 1.09MPa～1.85MPa, MOR is 10.50MPa～20.40MPa.
The specific embodiment two: present embodiment and the specific embodiment one are different is to be to be that 35%～75% bark carries out the defibrator process activation to moisture content under 140 ℃～192 ℃ the condition in temperature in the step 1.Other is identical with the specific embodiment one.
The self-bonding bark board density of present embodiment gained is 900kg/m
3～1100kg/m
3, internal bond strength is 1.09MPa～1.85MPa, MOR is 10.50MPa～20.40MPa.
The specific embodiment three: present embodiment is different with the specific embodiment one or two is to be to be that 35%～75% bark carries out the defibrator process activation to moisture content under the condition of 0.3MPa～1.2MPa at pressure in the step 1.Other is identical with the specific embodiment one or two.
The self-bonding bark board density of present embodiment gained is 900kg/m
3～1100kg/m
3, internal bond strength is 1.09MPa～1.85MPa, MOR is 10.50MPa～20.40MPa.
The specific embodiment four: present embodiment and the specific embodiment one to three are different is to be to be that 35%～75% bark carries out the defibrator process activation to moisture content under the condition of 0.1mm～1.0mm at the defibrator abrasive disk space in the step 1.Other is identical with the specific embodiment one to three.
The self-bonding bark board density of present embodiment gained is 900kg/m
3～1100kg/m
3, internal bond strength is 1.09MPa～1.85MPa, MOR is 10.50MPa～20.40MPa.
The specific embodiment five: present embodiment and the specific embodiment one to four are different is to be to be that 35%～75% bark carries out the defibrator process activation to moisture content under 1200 rev/mins～2200 rev/mins the condition at the defibrator speed of grinding plate in the step 1.Other is identical with the specific embodiment one to four.
The self-bonding bark board density of present embodiment gained is 900kg/m
3～1100kg/m
3, internal bond strength is 1.09MPa～1.85MPa, MOR is 10.50MPa～20.40MPa.
The specific embodiment six: present embodiment and the specific embodiment one to five are different is that the bottom and the top layer of three-decker plate embryo in the step 3 is that the thick moisture content of 5mm～25mm is 5%～10% softwood wood-fibred.Other is identical with the specific embodiment one to five.
The self-bonding bark board density of present embodiment gained is 900kg/m
3～1100kg/m
3, internal bond strength is 1.09MPa～1.85MPa, MOR is 10.50MPa～20.40MPa.
The specific embodiment seven: present embodiment and the specific embodiment one to six are different is that the sandwich layer of three-decker plate embryo in the step 3 is that the thick moisture content of 20mm～90mm is 3.5%～12% the bark fiber and the mixture of bark fines.Other is identical with the specific embodiment one to six.
The self-bonding bark board density of present embodiment gained is 900kg/m
3～1100kg/m
3, internal bond strength is 1.09MPa～1.85MPa, MOR is 10.50MPa～20.40MPa.
The specific embodiment eight: present embodiment and the specific embodiment one to seven are different is that the temperature of heat pressing forming machines in the step 4 is 240 ℃～260 ℃.Other is identical with the specific embodiment one to seven.
The self-bonding bark board density of present embodiment gained is 900kg/m
3～1100kg/m
3, internal bond strength is 1.09MPa～1.85MPa, MOR is 10.50MPa～20.40MPa.
The specific embodiment nine: what present embodiment and the specific embodiment one to eight were different is that hot pressing time is 6 minutes～8 minutes in the step 4.Other is identical with the specific embodiment one to eight.
The self-bonding bark board density of present embodiment gained is 900kg/m
3～1100kg/m
3, internal bond strength is 1.09MPa～1.85MPa, MOR is 10.50MPa～20.40MPa.
The specific embodiment ten: present embodiment and the specific embodiment one to nine are different is hot-forming as follows described in the step 4: it is 220 ℃～260 ℃ heat pressing forming machines that the three-decker plate embryo of step 3 gained is put into temperature, under the pressure of 2.75MPa, kept 1 minute～1.5 minutes, in 20 seconds～40 seconds, unload then and be depressed into 0.1MPa～0.2MPa and kept 1 minute～1.5 minutes, boost to 1.0MPa～1.5MPa again and kept 1.5～15 minutes, be depressurized to 0.4MPa～0.6MPa then and kept 0.5 minute～1 minute, with 1 minute pressure is dropped to normal pressure more at last, promptly get self-bonding bark board with three-layered structure.Other is identical with the specific embodiment one to nine.
The self-bonding bark board density of present embodiment gained is 900kg/m
3～1100kg/m
3, internal bond strength is 1.09MPa～1.85MPa, MOR is 10.50MPa～20.40MPa.
The specific embodiment 11: present embodiment adopts and to be ground to 16 purpose bark fines to prepare the method for Bark as follows: step 1, plate embryo are mated formation: lay the thick 16 purpose bark fines of 20mm～90mm on spreading machine, form single layer structure plate embryo; Step 2, hot-forming: it is 220 ℃～260 ℃ heat pressing forming machines that single layer structure plate embryo is put into temperature, under the pressure of 2.75MPa, kept 1 minute～1.5 minutes, in 20 seconds～40 seconds, unload then and be depressed into 0.1MPa～0.2MPa and kept 1 minute～1.5 minutes, boost to 1.0MPa～1.5MPa again and kept 20 minutes, be depressurized to 0.4MPa～0.6MPa then and kept 0.5 minute～1 minute, with 1 minute pressure is dropped to normal pressure more at last, promptly get Bark.
The preparation method of present embodiment individual layer self-bonding bark board is as follows: step 1, bark defibrator process activation: with moisture content is that 35%～75% bark adds in the defibrator, be that 140 ℃～192 ℃, pressure are that 0.2MPa～1.2MPa, defibrator abrasive disk space are that 0.1mm～1.0mm, defibrator speed of grinding plate are defibrator process 1 minute～5 minutes under 1200 rev/mins～2200 rev/mins the condition in temperature then, obtain the mixture of bark fiber and bark fines, then the mixture of bark fiber and bark fines being dried to moisture content is 3.5%～12%; Step 2, plate embryo are mated formation: lay the thick moisture content of 45mm and be 3.5%～12% the bark fiber and the mixture of bark fines on spreading machine, form single layer structure plate embryo; Step 3, hot-forming: it is 220 ℃～260 ℃ heat pressing forming machines that single layer structure plate embryo is put into temperature, under the pressure of 2.75MPa, kept 1.5 minutes, in 30 seconds, unload then and be depressed into 0.1MPa～0.2MPa and kept 1 minute, boost to 1.0MPa～1.5MPa again and kept 15 minutes, be depressurized to 0.4MPa～0.6MPa then and kept 1 minute, with 1 minute pressure is dropped to normal pressure more at last, promptly get the individual layer self-bonding bark board.
The glue performance that the bark hot pressing of bark fines of adopt grinding and defibrator process activation obtains Bark is to such as table 1:
Table 1
Annotate: because China does not have the Bark standard, the density of bark sheet material, internal bond strength and MOR are measured according to Unite States Standard ANSI A208.1-1999.
Under the identical as shown in Table 1 making sheet condition, make the internal bond strength of self-bonding bark board and MOR by the bark of defibrator process activation and be better than the Bark that is prepared into by the bark powder of grinding, especially the difference of internal bond strength and MOR is more obvious when hot pressing temperature is low, illustrate that the defibrator process process makes bark activate, the no glue glued adhesion better effects if when promoting hot pressing.It can also be seen that by table 1, adopt the single layer structure Bark of the mixture preparation of defibrator process activation gained bark fiber and bark fines, its MOR all be lower than the standard-required value (＞16.5MPa).
The specific embodiment 12: the preparation method of self-bonding bark board with three-layered structure is as follows in the present embodiment: step 1, bark defibrator process activation: with moisture content is that 50% bark adds in the defibrator, it is 145～192 ℃ in temperature then, pressure is 0.5MPa～1.2MPa, the defibrator abrasive disk space is 0.1mm～0.5mm, the defibrator speed of grinding plate is defibrator process 2 minutes～5 minutes under 1200 rev/mins～2200 rev/mins the condition, obtain the mixture of bark fiber and bark fines, then the mixture of bark fiber and bark fines being dried to moisture content is 3.5%～12%; Step 2, hot grinding wood fiber: with moisture content is that 90% needlebush wood chip adds in the defibrator, be that 192 ℃, pressure are that 0.2MPa, defibrator abrasive disk space are that 0.1mm, defibrator speed of grinding plate are defibrator process 2 minutes～3.5 minutes under 1700 rev/mins the condition in temperature then, obtain the softwood wood-fibred, the softwood wood-fibred being dried to moisture content then is 5%～10%; Step 3, plate embryo are mated formation: the thick moisture content of laying 5mm is 5%～10% softwood wood-fibred on spreading machine, laying the thick moisture content of 35mm at softwood wood-fibred upper surface then is 3.5%～12% the bark fiber and the mixture of bark fines, lay the thick softwood wood-fibred of 5mm at the mixture upper surface of bark fiber and bark fines again, forming bottom is that softwood wood-fibred, sandwich layer are the mixture of bark fiber and bark fines, the three-decker plate embryo that the top layer is the softwood wood-fibred; Step 4, hot-forming: it is 260 ℃ heat pressing forming machines that the three-decker plate embryo of step 3 gained is put into temperature, under the pressure of 2.75MPa, kept 1 minute, in 30 seconds, unload then and be depressed into 0.1MPa～0.2MPa and kept 1 minute, boost to 1.0MPa～1.5MPa again and kept 1.5 minutes, be depressurized to 0.4MPa～0.6MPa then and kept 1 minute, with 1 minute pressure is dropped to normal pressure more at last, promptly get self-bonding bark board with three-layered structure.
Adopt the self-bonding bark board with three-layered structure performance such as the table 2 of present embodiment gained:
Table 2
Annotate: 1) average fiber length adopts Barer MeNett bauer mcnett classifier barer menett mensuration to obtain.
2) after＞200 order powder quality ratio refers to that defibrator process is handled, can account for the percentage of defibrator process activation bark gross mass by the bark fine powder quality of 200 eye mesh screens.
3) because China does not have the Bark standard, the density of bark sheet material, internal bond strength and MOR are measured according to Unite States Standard ANSI A208.1-1999.
The self-bonding bark board with three-layered structure internal bond strength and the MOR that adopt present embodiment to make as shown in Table 2 all are higher than the standard-required value, and more surplus can also be arranged, shown in the Bark that code name in the table 2 is B3, B4, B5, B6 and B7.
The specific embodiment 13: the preparation method of self-bonding bark board with three-layered structure is as follows in the present embodiment: step 1, bark defibrator process activation: with moisture content is that 50% bark adds in the defibrator, be that 192 ℃, pressure are that 0.7MPa, defibrator abrasive disk space are that 0.1mm, defibrator speed of grinding plate are defibrator process 3.5 minutes under 1700 rev/mins the condition in temperature then, obtain the mixture of bark fiber and bark fines, then the mixture of bark fiber and bark fines being dried to moisture content is 3.5%～12%; Step 2, hot grinding wood fiber: with moisture content is that 90% needlebush wood chip adds in the defibrator, be that 192 ℃, pressure are that 0.2MPa, defibrator abrasive disk space are that 0.1mm, defibrator speed of grinding plate are defibrator process 2 minutes～3.5 minutes under 1700 rev/mins the condition in temperature then, obtain the softwood wood-fibred, the softwood wood-fibred being dried to moisture content then is 5%～10%; Step 3, plate embryo are mated formation: the thick moisture content of laying 5mm is 5%～10% softwood wood-fibred on spreading machine, laying the thick moisture content of 85mm at softwood wood-fibred upper surface then is 3.5%～12% the bark fiber and the mixture of bark fines, lay the thick softwood wood-fibred of 5mm at the mixture upper surface of bark fiber and bark fines again, forming bottom is that softwood wood-fibred, sandwich layer are the mixture of bark fiber and bark fines, the three-decker plate embryo that the top layer is the softwood wood-fibred; Step 4, hot-forming: it is 260 ℃ heat pressing forming machines that the three-decker plate embryo of step 3 gained is put into temperature, under the pressure of 2.75MPa, kept 1 minute, in 45 seconds, unload then and be depressed into 0.1MPa～0.2MPa and kept 1 minute, boost to 1.0MPa～1.5MPa again and kept 1.5 minutes, be depressurized to 0.4MPa～0.6MPa then and kept 45 seconds, with 1 minute pressure is dropped to normal pressure more at last, promptly get self-bonding bark board with three-layered structure.
Present embodiment gained self-bonding bark board with three-layered structure and the performance comparison such as the table 3 that adopt the specific embodiment 11 describing method gained individual layer self-bonding bark boards:
Table 3
Annotate: because China does not have the Bark standard, the density of bark sheet material, internal bond strength and MOR are measured according to Unite States Standard ANSIA208.1-1999.
Adopt the MOR height of the single layer structure self-bonding bark board that the three-decker plate embryo self-bonding bark board with three-layered structure that (6 minutes) are prepared in short hot pressing time is prepared into than longer hot pressing time (15 minutes) as shown in Table 3.By table 2 and table 3 also as can be known, owing to adopt three-decker plate embryo and defibrator process activation bark, even the self-bonding bark board with three-layered structure that is prepared in lower hot-forming temperature (260 ℃) and short time (6 minutes～8 minutes), than Chow (Chow S.Bark board withoutsynthetic resins.Forest Products Journal, 1975, Vo1.25 No.11:32-37) adopts MOR (13.1MPa) height of the bark powder of Willey grinder grinding at the self-bonding bark board of 280 ℃ of hot pressing preparation in 20 minutes.Therefore adopt three-decker plate embryo and hot pressing activation bark to prepare the preparation method of self-bonding bark board with three-layered structure, not only can reduce hot-forming temperature, effectively shorten pressing cycle, enhance productivity, can also effectively improve the MOR of self-bonding bark board.
The specific embodiment 14: in the present embodiment in the present embodiment preparation method of self-bonding bark board with three-layered structure as follows: step 1, bark defibrator process activation: with moisture content is that 35%～75% bark adds in the defibrator, it is 140 ℃～192 ℃ in temperature then, pressure is 0.3MPa～1.2MPa, the defibrator abrasive disk space is 0.1mm～1.0mm, the defibrator speed of grinding plate is defibrator process 1 minute～5 minutes under 1200 rev/mins～2200 rev/mins the condition, obtain the mixture of bark fiber and bark fines, then the mixture of bark fiber and bark fines being dried to moisture content is 3.5%～12%; Step 2, hot grinding wood fiber: with moisture content is that 40%～90% needlebush wood chip adds in the defibrator, be that 140 ℃～192 ℃, pressure are that 0.2MPa～1.2MPa, defibrator abrasive disk space are that 0.1mm～1.0mm, defibrator speed of grinding plate are defibrator process 2 minutes～5 minutes under 1200 rev/mins～2200 rev/mins the condition in temperature then, obtain the softwood wood-fibred, the softwood wood-fibred being dried to moisture content then is 5%～10%; Step 3, plate embryo are mated formation: lay the thick moisture content of 5mm～25mm and be 5%～10% softwood wood-fibred on spreading machine, laying the thick moisture content of 20mm～90mm at softwood wood-fibred upper surface then is 3.5%～12% the bark fiber and the mixture of bark fines, lay the thick softwood wood-fibred of 5mm～25mm at the mixture upper surface of bark fiber and bark fines again, forming bottom is that softwood wood-fibred, sandwich layer are the mixture of bark fiber and bark fines, the three-decker plate embryo that the top layer is the softwood wood-fibred; Step 4, hot-forming: is hot pressing 5.25 minutes～20.75 minutes in 220 ℃～260 ℃ the heat pressing forming machines with the three-decker plate embryo of step 3 gained in temperature, promptly gets self-bonding bark board with three-layered structure.
The self-bonding bark board density of present embodiment gained is 900kg/m
3～1100kg/m
3, internal bond strength is 1.09MPa～1.85MPa, MOR is 10.50MPa～20.40MPa.
Claims (10)
1. the preparation method of self-bonding bark board with three-layered structure, the preparation method who it is characterized in that self-bonding bark board with three-layered structure is as follows: step 1, bark defibrator process activation: with moisture content is that 35%～75% bark adds in the defibrator, it is 130 ℃～195 ℃ in temperature then, pressure is 0.1MPa～1.3MPa, the defibrator abrasive disk space is 0.08mm～1.1mm, the defibrator speed of grinding plate is defibrator process 0.5 minute～6 minutes under 1000 rev/mins～2400 rev/mins the condition, obtain the mixture of bark fiber and bark fines, then the mixture of bark fiber and bark fines being dried to moisture content is 3.5%～12%; Step 2, hot grinding wood fiber: with moisture content is that 40%～90% needlebush wood chip adds in the defibrator, be that 130 ℃～195 ℃, pressure are that 0.1MPa～1.3MPa, defibrator abrasive disk space are that 0.08mm～1.1mm, defibrator speed of grinding plate are defibrator process 1 minute～5 minutes under 1000 rev/mins～2400 rev/mins the condition in temperature then, obtain the softwood wood-fibred, the softwood wood-fibred being dried to moisture content then is 5%～10%; Step 3, plate embryo are mated formation: lay the thick moisture content of 3mm～30mm and be 5%～10% softwood wood-fibred on spreading machine, laying the thick moisture content of 15mm～100mm at softwood wood-fibred upper surface then is 3.5%～12% the bark fiber and the mixture of bark fines, lay the thick softwood wood-fibred of 3mm～30mm at the mixture upper surface of bark fiber and bark fines again, forming bottom is that softwood wood-fibred, sandwich layer are the mixture of bark fiber and bark fines, the three-decker plate embryo that the top layer is the softwood wood-fibred; Step 4, hot-forming: is hot pressing 5.25 minutes～20.75 minutes in 220 ℃～280 ℃ the heat pressing forming machines with the three-decker plate embryo of step 3 gained in temperature, promptly gets self-bonding bark board with three-layered structure.
2. the preparation method of self-bonding bark board with three-layered structure according to claim 1, it is characterized in that hot-forming as follows described in the step 4: it is 220 ℃～280 ℃ heat pressing forming machines that the three-decker plate embryo of step 3 gained is put into temperature, under the pressure of 2.75MPa, kept 1 minute～1.5 minutes, in 15 seconds～45 seconds, unload then and be depressed into 0.1MPa～0.2MPa and kept 1 minute～1.5 minutes, boost to 1.0MPa～1.5MPa again and kept 1.5～15 minutes, be depressurized to 0.4MPa～0.6MPa then and kept 0.5 minute～1 minute, with 1 minute pressure is dropped to normal pressure more at last, promptly get self-bonding bark board with three-layered structure.
3. the preparation method of self-bonding bark board with three-layered structure according to claim 1 and 2 is characterized in that in the step 1 in temperature being to be that 35%～75% bark carries out the defibrator process activation to moisture content under 140 ℃～192 ℃ the condition.
4. the preparation method of self-bonding bark board with three-layered structure according to claim 3 is characterized in that in the step 1 at pressure being to be that 35%～75% bark carries out the defibrator process activation to moisture content under the condition of 0.3MPa～1.2MPa.
5. according to the preparation method of claim 1,2 or 4 described self-bonding bark board with three-layered structure, it is characterized in that in the step 1 at the defibrator abrasive disk space being to be that 35%～75% bark carries out the defibrator process activation to moisture content under the condition of 0.1mm～1.0mm.
6. the preparation method of self-bonding bark board with three-layered structure according to claim 5 is characterized in that in the step 1 at the defibrator speed of grinding plate being to be that 35%～75% bark carries out the defibrator process activation to moisture content under 1200 rev/mins～2200 rev/mins the condition.
7. according to the preparation method of claim 1,2,4 or 6 described self-bonding bark board with three-layered structure, it is characterized in that the bottom of three-decker plate embryo in the step 3 and top layer are that the thick moisture content of 5mm～25mm is 5%～10% softwood wood-fibred.
8. the preparation method of self-bonding bark board with three-layered structure according to claim 7, the sandwich layer that it is characterized in that three-decker plate embryo in the step 3 is that the thick moisture content of 20mm～90mm is 3.5%～12% the bark fiber and the mixture of bark fines.
9. according to the preparation method of claim 1,2,4,6 or 8 described self-bonding bark board with three-layered structure, the temperature that it is characterized in that heat pressing forming machines in the step 4 is 240 ℃～260 ℃.
10. the preparation method of self-bonding bark board with three-layered structure according to claim 9 is characterized in that hot pressing time is 6 minutes～8 minutes in the step 4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102620012A CN101745946B (en) | 2009-12-15 | 2009-12-15 | Preparation method of self-bonding bark board with three-layered structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102620012A CN101745946B (en) | 2009-12-15 | 2009-12-15 | Preparation method of self-bonding bark board with three-layered structure |
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| Publication Number | Publication Date |
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| CN101745946A true CN101745946A (en) | 2010-06-23 |
| CN101745946B CN101745946B (en) | 2012-04-18 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103146153A (en) * | 2011-12-07 | 2013-06-12 | 杜邦公司 | Flame-retardant copolyether ester composition and product comprising the flame-retardant copolyether ester composition |
| CN105382889A (en) * | 2016-01-22 | 2016-03-09 | 栾金榜 | Hot pressing process for plywood |
| CN107081833A (en) * | 2017-05-07 | 2017-08-22 | 黄达尔 | A kind of indoor beat insulating sound insulating board and preparation method thereof |
-
2009
- 2009-12-15 CN CN2009102620012A patent/CN101745946B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103146153A (en) * | 2011-12-07 | 2013-06-12 | 杜邦公司 | Flame-retardant copolyether ester composition and product comprising the flame-retardant copolyether ester composition |
| CN105382889A (en) * | 2016-01-22 | 2016-03-09 | 栾金榜 | Hot pressing process for plywood |
| CN107081833A (en) * | 2017-05-07 | 2017-08-22 | 黄达尔 | A kind of indoor beat insulating sound insulating board and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101745946B (en) | 2012-04-18 |
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