Three, summary of the invention
Technical problem: technical problem to be solved by this invention provides a kind of being applicable to and engraves the MDF that mills processing, and the panel density that this technology is prepared distributes rationally, and intensity is moderate and burst size of methanal is low.
Technical scheme: technical solution of the present invention is: a kind of routing plate processing technique, and procedure of processing is: the chipping and screening of timber: the seeds that proportion is close, chip into wood chip of uniform size; Pre-boiling and boiling: the wood chip after chipping is carried out pre-boiling 3~5 minutes with saturated vapor, and pre-boiling temperature is 90~100 ℃, carries out boiling again 3~5 minutes, and boiling temperature is 165~175 ℃; Fiber separation: the wood chip of boiling is separated fibre by defibrator, in the wood-fibred that obtains 〉=10~20% ,≤00 purpose that 36 purposes account for total fiber weight accounts for 5~10% of total fiber weight; The preparation of E1 level urea-formaldehyde glue:, add the NaOH adjust pH 8.5~8.8 of mass concentration 30% with behind formaldehyde heat temperature raising to 30~35 in the container ℃; Add first urea, addition is 35% of a formaldehyde quality, be stirred to the temperature balance after, survey pH value 8.3~8.5; Heat temperature raising to 65~83 ℃, during survey pH values and transfer to 6.8~7.1 at 75~80 ℃, be warming up to 88 ℃ and insulation again, temperature is controlled between 88~92 ℃, the time from heat temperature raising to the insulation end is 70~80 minutes; Add melamine again, addition is 2% of a formaldehyde quality, and melamine adds and finishes the back and add UF modifier solution (Beijing Yong Ganghai days auxiliary agent companies), is incubated 10 minutes, and temperature is controlled between 85~88 ℃; With mass concentration is that 15% formic acid HCOOH adjust pH is 6.0~6.2, be coated with 4 agar diffusion methods in use after the pH value mixes up and carry out viscosimetric analysis, under 30 ℃ condition determination, when viscosity reaches 13~13.5 seconds, viscosity of survey in per 5~10 minutes, continuous viscosimetric during near terminal point viscosity, terminal point viscosity is controlled at 18.0~18.5 seconds (4# cups, the size of 30 ℃-control adhesive molecular weight), be controlled at 80~100 minutes from mixing up pH value to the time that reaches terminal point viscosity, temperature is controlled at 88~93 ℃; Add ET port auxiliary agent and melamine and second batch of urea forever, wherein ET forever the addition of port auxiliary agent be 0.5% of formaldehyde quality, (this auxiliary agent also is the product of Beijing Yong Ganghai days auxiliary agent companies), the addition of melamine is 3% of a formaldehyde quality, the addition of urea is 19% of a formaldehyde quality, begins viscosimetric after adding, and surveying secondary viscosity is 20.0~21.0 seconds (4# cups, the size of 30 ℃-control adhesive molecular weight), temperature is controlled between 80~85 ℃; Add ET port auxiliary agent forever, addition is 0.5% (this auxiliary agent also is the product of Beijing Yong Ganghai days auxiliary agent companies) and the 3rd batch of urea of formaldehyde quality, and addition is 12% of a formaldehyde quality, reacts cooling naturally after 15 minutes; Add the 4th batch of urea when being cooled to 65 ℃, addition is 4% of a formaldehyde quality, adds the 5th batch of urea when being cooled to 50 ℃, and addition is 1.5% of a formaldehyde quality, adjust pH is 8.0~8.5 when being cooled to 45 ℃ naturally, when being cooled to 40 ℃ naturally product is pumped out to basin; The preparation of curing agent: the mixed aqueous solution of preparation phosphoric acid, methenamine, triethanolamine and ammonium sulfate, wherein phosphoric acid: methenamine: triethanolamine: the weight ratio of ammonium sulfate is 5: 3: 3: 20, and the addition of ammonium sulfate is 0.5~1% of a urea-formaldehyde glue quality; Urea-formaldehyde glue, curing agent and paraffin add: when fiber when defibrator enters blow line, carry out applying glue, applying wax simultaneously and execute curing agent, apply the amount of urea-formaldehyde glue: 180~190kg/m
3Apply paraffin amount: 8~9kg/m
3The amount that applies urea-formaldehyde glue is 10%~13% of a lumber quality; The fiber that added urea-formaldehyde glue, curing agent and paraffin is carried out drying, and dried fiber moisture is: 9~10%; Dried wood-fibred is mated formation evenly, and under 3.0~5.0MPa pressure, flatten in advance; Under 180~185 ℃ of conditions, carry out hot pressing, hot pressing: slab is imported in the hot press, after in 40~45 second time, boosting to 210bar, reduce to 38bar then, between 38bar and 43bar, suppress the transmission that temperature is carried out in step-down more repeatedly, pick up counting from the 210bar step-down, to the time that begins to beat secondary high-pressure be 160~165 seconds, press to getting to 160bar from 38bar for beating secondary high-pressure, the back is slow reduces to 155bar, and this time in stage is 60~65 seconds, the back is to carry out three grades of step-downs to handle, step-down in 3 seconds once is depressurized to for the first time 80bar, is depressurized to 30bar for the second time, be depressurized to 17bar for the third time, through 8 seconds, reduce to 15bar again, drop to the end through press in 38 seconds more at last; Cooling and modified: the plate temperature is cooled to 60 ℃, and stacking is modified to eliminate the plate internal stress; Sanding and sawing: sander is sawn to required size after with the hair plates sanding surface; Grade and pack.
GB is coated with the testing process of 4 agar diffusion methods: the horizontal position adjustment that will be coated with 4 glasss earlier is good, by the outlet of staying, implantation temperature is 25 ℃ a urea-formaldehyde glue in the cup again, and the urea-formaldehyde glue of high cup mouth is wiped off with glass bar with left index finger, when unclamping left index finger, the stopwatch of the right hand is pressed timing, when urea-formaldehyde glue from being coated with 4 glasss when having flowed, press stopwatch more simultaneously, the record stop watch figures, repeat twice, get its mean value, this numerical value is exactly the viscosity of urea-formaldehyde glue.
Beneficial effect: engrave that to mill type E1 level MDF be a kind of of furniture base material, technology content is higher, mills embossment, can slot but be adapted to engrave, and is usually used in that high-grade door-plate is made and indoor decoration (artistic embossment of metope and skirting).The mol ratio that reduces formaldehyde and urea is to prepare one of effective method of E1 grade urea-formaldehyde resin and environment-friendly type MDF thereof, the formaldehyde/urea mol ratio is 0.98, can produce burst size of methanal and reach the following standard of 9mg/100g, formaldehyde/urea mol ratio under this proportioning process has guaranteed the urea-formaldehyde glue performance by adhesive-preparing technology, the stable mechanical property of its product, production efficiency improves; In the impregnation process, improve the buffer capacity of virgin rubber, reduced glue precuring time in drying duct, reduced the glue consumption; The glue of guaranteeing low mol ratio solidifies in hot pressing fully, improves handing-over intensity; This technology effectively reduces the plank burst size of methanal.
Five, the specific embodiment
Embodiment 1:
A kind of routing plate processing technique, procedure of processing is: the chipping and screening of timber: the seeds that proportion is close, chip into wood chip of uniform size; Pre-boiling and boiling: the wood chip after chipping is carried out pre-boiling 3 minutes with saturated vapor, and pre-boiling temperature is 90 ℃, carries out boiling again 3 minutes, and boiling temperature is 165 ℃; Fiber separation: the wood chip of boiling is separated fibre by defibrator, in the wood-fibred that obtains 〉=10% ,≤200 purposes that 36 purposes account for total fiber weight account for 5% of total fiber weight; The preparation of E1 level urea-formaldehyde glue:, add the NaOH adjust pH 8.5 of mass concentration 30% with behind the formaldehyde heat temperature raising to 30 in the container ℃; Add first urea, addition is 35% of a formaldehyde quality, be stirred to the temperature balance after, survey pH value 8.3~8.5; Heat temperature raising to 65~83 ℃, during survey pH values and transfer to 6.8 at 75~80 ℃, be warming up to 88 ℃ and insulation again, temperature is controlled between 88~92 ℃, the time from heat temperature raising to the insulation end is 70 minutes; Add melamine again, addition is 2% of a formaldehyde quality, and melamine adds and finishes the back and add the UF modifier solution, is incubated 10 minutes, and temperature is controlled at 85 ℃; With mass concentration is that 15% formic acid HCOOH adjust pH is 6.0, the pH value mixes up the back and uses under 30 ℃ condition determination and be coated with four methods and carry out viscosimetric analysis, when viscosity reaches 13~13.5 seconds, surveyed a viscosity in per 5~10 minutes, continuous viscosimetric during near terminal point viscosity, terminal point viscosity was controlled at 18.0 seconds, was controlled at 80 minutes from mixing up pH value to the time that reaches terminal point viscosity, and temperature is controlled at 88 ℃; Add ET port auxiliary agent and melamine and second batch of urea forever, wherein ET forever the addition of port auxiliary agent be 0.5% of formaldehyde quality, the addition of melamine is 3% of a formaldehyde quality, the addition of urea is 19% of a formaldehyde quality, begin viscosimetric after adding, surveying secondary viscosity is 20.0~21.0 seconds, and temperature is controlled at 80 ℃; Add ET port auxiliary agent and the 3rd batch of urea forever, the ET addition of port auxiliary agent forever is that the addition of 0.5%, the three batch of urea of formaldehyde quality is 12% of a formaldehyde quality, react after 15 minutes and lowers the temperature naturally; Add the 4th batch of urea when being cooled to 65 ℃, addition is 4% of a formaldehyde quality, adds the 5th batch of urea when being cooled to 50 ℃, and addition is 1.5% of a formaldehyde quality, adjust pH is 8.0 when being cooled to 45 ℃ naturally, when being cooled to 40 ℃ naturally product is pumped out to basin; The preparation of curing agent: the mixed aqueous solution of preparation phosphoric acid, methenamine, triethanolamine and ammonium sulfate, wherein phosphoric acid: methenamine: triethanolamine: the weight ratio of ammonium sulfate is 5: 3: 3: 20, and the addition of ammonium sulfate is 0.5% of a urea-formaldehyde glue quality; Urea-formaldehyde glue, curing agent and paraffin add: when fiber when defibrator enters blow line, carry out applying glue, applying wax simultaneously and execute curing agent, in lumber fibre, apply the amount of adhesive: 180kg/m
3Apply paraffin amount: 8kg/m
3The amount that applies urea-formaldehyde glue is 10% of a lumber quality; The fiber that added urea-formaldehyde glue, adhesive and paraffin is carried out drying, and dried fiber moisture is: 9%; Dried wood-fibred is mated formation evenly, and under 3.0MPa pressure, flatten in advance; Under 180 ℃ of conditions, carry out hot pressing, hot pressing: slab is imported in the hot press, after in 40~45 second time, boosting to 210bar, reduce to 38bar then, between 38bar and 43bar, suppress the transmission that temperature is carried out in step-down more repeatedly, pick up counting from the 210bar step-down, to the time that begins to beat secondary high-pressure be 160~165 seconds, press to getting to 160bar from 38bar for beating secondary high-pressure, the back is slow reduces to 155bar, and this time in stage is 60~65 seconds, the back is to carry out three grades of step-downs to handle, step-down in 3 seconds once is depressurized to for the first time 80bar, is depressurized to 30bar for the second time, be depressurized to 17bar for the third time, through 8 seconds, reduce to 15bar again, drop to the end through press in 38 seconds more at last; Cooling and modified: the plate temperature is cooled to 60 ℃, and stacking is modified to eliminate the plate internal stress; Sanding and sawing: sander is sawn to required size after with the hair plates sanding surface; Grade and pack.
Embodiment 2:
A kind of routing plate processing technique, procedure of processing is: the chipping and screening of timber: the seeds that proportion is close, chip into wood chip of uniform size; Pre-boiling and boiling: the wood chip after chipping is carried out pre-boiling 5 minutes with saturated vapor, and pre-boiling temperature is 100 ℃, carries out boiling again 5 minutes, and boiling temperature is 175 ℃; Fiber separation: the wood chip of boiling is separated fibre by defibrator, in the wood-fibred that obtains 〉=20% ,≤200 purposes that 36 purposes account for total fiber weight account for 10% of total fiber weight; The preparation of E1 level urea-formaldehyde glue:, add the NaOH adjust pH 8.8 of mass concentration 30% with behind the formaldehyde heat temperature raising to 35 in the container ℃; Add first urea, addition is 35% of a formaldehyde quality, be stirred to the temperature balance after, survey pH value 8.5; Heat temperature raising to 65~83 ℃, during survey pH values and transfer to 7.1 at 75~80 ℃, be warming up to 88 ℃ and insulation again, temperature is controlled at 92 ℃, the time from heat temperature raising to the insulation end is 80 minutes; Add melamine again, addition is 2% of a formaldehyde quality, and melamine adds and finishes the back and add UF modifier solution (Beijing Yong Ganghai days auxiliary agent companies), is incubated 10 minutes, and temperature is controlled at 88 ℃; With mass concentration is that 15% formic acid HCOOH adjust pH is 6.2, be coated with 4 agar diffusion methods in use after the pH value mixes up and carry out viscosimetric analysis, under 30 ℃ condition determination, when viscosity reaches 13~13.5 seconds, viscosity of survey in per 5~10 minutes, continuous viscosimetric during near terminal point viscosity, terminal point viscosity is controlled at 18.0~18.5 seconds (4# cups, the size of 30 ℃-control adhesive molecular weight), be controlled at 100 minutes from mixing up pH value to the time that reaches terminal point viscosity, temperature is controlled at 93 ℃; Add ET port auxiliary agent and melamine and second batch of urea forever, wherein ET forever the addition of port auxiliary agent be 0.5% of formaldehyde quality, (this auxiliary agent also is the product of Beijing Yong Ganghai days auxiliary agent companies), the addition of melamine is 3% of a formaldehyde quality, the addition of urea is 19% of a formaldehyde quality, begins viscosimetric after adding, and surveying secondary viscosity is 20.0~21.0 seconds (4# cups, the size of 30 ℃-control adhesive molecular weight), temperature is controlled at 85 ℃; Add ET port auxiliary agent forever, addition is 0.5% (this auxiliary agent also is the product of Beijing Yong Ganghai days auxiliary agent companies) and the 3rd batch of urea of formaldehyde quality, and addition is 12% of a formaldehyde quality, reacts cooling naturally after 15 minutes; Add the 4th batch of urea when being cooled to 65 ℃, addition is 4% of a formaldehyde quality, adds the 5th batch of urea when being cooled to 50 ℃, and addition is 1.5% of a formaldehyde quality, adjust pH is 8.5 when being cooled to 45 ℃ naturally, when being cooled to 40 ℃ naturally product is pumped out to basin; The preparation of curing agent: the mixed aqueous solution of preparation phosphoric acid, methenamine, triethanolamine and ammonium sulfate, wherein phosphoric acid: methenamine: triethanolamine: the weight ratio of ammonium sulfate is 5: 3: 3: 20, and the addition of ammonium sulfate is 1% of a urea-formaldehyde glue quality; Urea-formaldehyde glue, curing agent and paraffin add: when fiber when defibrator enters blow line, carry out applying glue, applying wax simultaneously and execute curing agent, apply the amount of urea-formaldehyde glue: 190kg/m
3Apply paraffin amount: 9kg/m
3The amount that applies urea-formaldehyde glue is 13% of a lumber quality; The fiber that added urea-formaldehyde glue, curing agent and paraffin is carried out drying, and dried fiber moisture is: 10%; Dried wood-fibred is mated formation evenly, and under 5.0MPa pressure, flatten in advance; Under 185 ℃ of conditions, carry out hot pressing, hot pressing: slab is imported in the hot press, after in 40~45 second time, boosting to 210bar, reduce to 38bar then, between 38bar and 43bar, suppress the transmission that temperature is carried out in step-down more repeatedly, pick up counting from the 210bar step-down, to the time that begins to beat secondary high-pressure be 160~165 seconds, press to getting to 160bar from 38bar for beating secondary high-pressure, the back is slow reduces to 155bar, and this time in stage is 60~65 seconds, the back is to carry out three grades of step-downs to handle, step-down in 3 seconds once is depressurized to for the first time 80bar, is depressurized to 30bar for the second time, be depressurized to 17bar for the third time, through 8 seconds, reduce to 15bar again, drop to the end through press in 38 seconds more at last; Cooling and modified: the plate temperature is cooled to 60 ℃, and stacking is modified to eliminate the plate internal stress; Sanding and sawing: sander is sawn to required size after with the hair plates sanding surface; Grade and pack.
Embodiment 3:
A kind of routing plate processing technique, procedure of processing is: the chipping and screening of timber: the seeds that proportion is close, chip into wood chip of uniform size; Pre-boiling and boiling: the wood chip after chipping is carried out pre-boiling 4 minutes with saturated vapor, and pre-boiling temperature is 95 ℃, carries out boiling again 4 minutes, and boiling temperature is 170 ℃; Fiber separation: the wood chip of boiling is separated fibre by defibrator, in the wood-fibred that obtains 〉=15% ,≤200 purposes that 36 purposes account for total fiber weight account for 8% of total fiber weight; The preparation of E1 level urea-formaldehyde glue:, add the NaOH adjust pH 8.7 of mass concentration 30% with behind the formaldehyde heat temperature raising to 33 in the container ℃; Add first urea, addition is 35% of a formaldehyde quality, be stirred to the temperature balance after, survey pH value 8.4; Heat temperature raising to 65~83 ℃, during survey pH values and transfer to 7.0 at 75~80 ℃, be warming up to 88 ℃ and insulation again, temperature is controlled at 90 ℃, the time from heat temperature raising to the insulation end is 75 minutes; Add melamine again, addition is 2% of a formaldehyde quality, and melamine adds and finishes the back and add the UF modifier solution, is incubated 10 minutes, and temperature is controlled at 87 ℃ 7; With mass concentration is that 15% formic acid HCOOH adjust pH is 6.1, the pH value mixes up the back and uses under 30 ℃ condition determination and be coated with four methods and carry out viscosimetric analysis, when viscosity reaches 13~13.5 seconds, surveyed a viscosity in per 5~10 minutes, continuous viscosimetric during near terminal point viscosity, terminal point viscosity was controlled at 18.0~18.5 seconds, was controlled at 90 minutes from mixing up pH value to the time that reaches terminal point viscosity, and temperature is controlled at 90 ℃; Add ET port auxiliary agent and melamine and second batch of urea forever, wherein ET forever the addition of port auxiliary agent be 0.5% of formaldehyde quality, the addition of melamine is 3% of a formaldehyde quality, the addition of urea is 19% of a formaldehyde quality, begin viscosimetric after adding, surveying secondary viscosity is 20.0~21.0 seconds, and temperature is controlled at 83 ℃; Add ET port auxiliary agent and the 3rd batch of urea forever, the ET addition of port auxiliary agent forever is that the addition of 0.5%, the three batch of urea of formaldehyde quality is 12% of a formaldehyde quality, react after 15 minutes and lowers the temperature naturally; Add the 4th batch of urea when being cooled to 65 ℃, addition is 4% of a formaldehyde quality, adds the 5th batch of urea when being cooled to 50 ℃, and addition is 1.5% of a formaldehyde quality, adjust pH is 8.3 when being cooled to 45 ℃ naturally, when being cooled to 40 ℃ naturally product is pumped out to basin; The preparation of curing agent: the mixed aqueous solution of preparation phosphoric acid, methenamine, triethanolamine and ammonium sulfate, wherein phosphoric acid: methenamine: triethanolamine: the weight ratio of ammonium sulfate is 5: 3: 3: 20, and the addition of ammonium sulfate is 0.8% of a urea-formaldehyde glue quality; Urea-formaldehyde glue, curing agent and paraffin add: when fiber when defibrator enters blow line, carry out applying glue, applying wax simultaneously and execute curing agent, in lumber fibre, apply the amount of adhesive: 185kg/m
3Apply paraffin amount: 8.5kg/m
3The amount that applies urea-formaldehyde glue is 12% of a lumber quality; The fiber that added urea-formaldehyde glue, adhesive and paraffin is carried out drying, and dried fiber moisture is: 9.5%; Dried wood-fibred is mated formation evenly, and under 4.0MPa pressure, flatten in advance; Under 182 ℃ of conditions, carry out hot pressing, hot pressing: slab is imported in the hot press, after in 40~45 second time, boosting to 210bar, reduce to 38bar then, between 38bar and 43bar, suppress the transmission that temperature is carried out in step-down more repeatedly, pick up counting from the 210bar step-down, to the time that begins to beat secondary high-pressure be 160~165 seconds, press to getting to 160bar from 38bar for beating secondary high-pressure, the back is slow reduces to 155bar, and this time in stage is 60~65 seconds, the back is to carry out three grades of step-downs to handle, step-down in 3 seconds once is depressurized to for the first time 80bar, is depressurized to 30bar for the second time, be depressurized to 17bar for the third time, through 8 seconds, reduce to 15bar again, drop to the end through press in 38 seconds more at last; Cooling and modified: the plate temperature is cooled to 60 ℃, and stacking is modified to eliminate the plate internal stress; Sanding and sawing: sander is sawn to required size after with the hair plates sanding surface; Grade and pack.
Embodiment 4
A kind of routing plate processing technique, procedure of processing is: the chipping and screening of timber: the seeds that proportion is close, chip into wood chip of uniform size; Pre-boiling and boiling: the wood chip after chipping is carried out pre-boiling 3~5 minutes with saturated vapor, and pre-boiling temperature is 90~100 ℃, carries out boiling again 3~5 minutes, and boiling temperature is 165~175 ℃; Fiber separation: the wood chip of boiling is separated fibre by defibrator, in the wood-fibred that obtains 〉=10~20% ,≤200 purposes that 36 purposes account for total fiber weight account for 5~10% of total fiber weight; The preparation of E1 level urea-formaldehyde glue:, add the NaOH adjust pH 8.5~8.8 of mass concentration 30% with behind formaldehyde heat temperature raising to 30~35 in the container ℃; Add first urea, addition is 35% of a formaldehyde quality, be stirred to the temperature balance after, survey pH value 8.3~8.5; Heat temperature raising to 65~83 ℃, during survey pH values and transfer to 6.8~7.1 at 75~80 ℃, be warming up to 88 ℃ and insulation again, temperature is controlled between 88~92 ℃, the time from heat temperature raising to the insulation end is 70~80 minutes; Add melamine again, addition is 2% of a formaldehyde quality, and melamine adds and finishes the back and add the UF modifier solution, is incubated 10 minutes, and temperature is controlled between 85~88 ℃; With mass concentration is that 15% formic acid HCOOH adjust pH is 6.0~6.2, the pH value mixes up the back and uses under 30 ℃ condition determination and be coated with four methods and carry out viscosimetric analysis, when viscosity reaches 13~13.5 seconds, surveyed a viscosity in per 5~10 minutes, continuous viscosimetric during near terminal point viscosity, terminal point viscosity was controlled at 18.0~18.5 seconds, was controlled at 80~100 minutes from mixing up pH value to the time that reaches terminal point viscosity, and temperature is controlled at 88~93 ℃; Add ET port auxiliary agent and melamine and second batch of urea forever, wherein ET forever the addition of port auxiliary agent be 0.5% of formaldehyde quality, the addition of melamine is 3% of a formaldehyde quality, the addition of urea is 19% of a formaldehyde quality, begin viscosimetric after adding, surveying secondary viscosity is 20.0~21.0 seconds, and temperature is controlled between 80~85 ℃; Add ET port auxiliary agent and the 3rd batch of urea forever, the ET addition of port auxiliary agent forever is that the addition of 0.5%, the three batch of urea of formaldehyde quality is 12% of a formaldehyde quality, react after 15 minutes and lowers the temperature naturally; Add the 4th batch of urea when being cooled to 65 ℃, addition is 4% of a formaldehyde quality, adds the 5th batch of urea when being cooled to 50 ℃, and addition is 1.5% of a formaldehyde quality, adjust pH is 8.0~8.5 when being cooled to 45 ℃ naturally, when being cooled to 40 ℃ naturally product is pumped out to basin; The preparation of curing agent: the mixed aqueous solution of preparation phosphoric acid, methenamine, triethanolamine and ammonium sulfate, wherein phosphoric acid: methenamine: triethanolamine: the weight ratio of ammonium sulfate is 5: 3: 3: 20, and the addition of ammonium sulfate is 0.5~1% of a urea-formaldehyde glue quality; Urea-formaldehyde glue, curing agent and paraffin add: when fiber when defibrator enters blow line, carry out applying glue, applying wax simultaneously and execute curing agent, in lumber fibre, apply the amount of adhesive: 180~190kg/m
3Apply paraffin amount: 8~9kg/m
3The amount that applies urea-formaldehyde glue is 10%~13% of a lumber quality; The fiber that added urea-formaldehyde glue, adhesive and paraffin is carried out drying, and dried fiber moisture is: 9~10%; Dried wood-fibred is mated formation evenly, and under 3.0~5.0MPa pressure, flatten in advance; Under 180~185 ℃ of conditions, carry out hot pressing, hot pressing: slab is imported in the hot press, after in 40~45 second time, boosting to 210bar, reduce to 38bar then, between 38bar and 43bar, suppress the transmission that temperature is carried out in step-down more repeatedly, pick up counting from the 210bar step-down, to the time that begins to beat secondary high-pressure be 160~165 seconds, press to getting to 160bar from 38bar for beating secondary high-pressure, the back is slow reduces to 155bar, and this time in stage is 60~65 seconds, the back is to carry out three grades of step-downs to handle, step-down in 3 seconds once is depressurized to for the first time 80bar, is depressurized to 30bar for the second time, be depressurized to 17bar for the third time, through 8 seconds, reduce to 15bar again, drop to the end through press in 38 seconds more at last; Cooling and modified: the plate temperature is cooled to 60 ℃, and stacking is modified to eliminate the plate internal stress; Sanding and sawing: sander is sawn to required size after with the hair plates sanding surface; Grade and pack.
Embodiment 5:
Embodiment 6:
From the common MDF of above 18mm and engrave the detection data of milling plate: it is higher to engrave the density of milling plate, generally at 750kg/m
3More than, and the density of common plate is at 730kg/m
3Below; Engrave mill plate internal bond strength greater than 0.75Mpa, and the internal bond strength of common plate is less than 0.70Mpa; Engrave mill plate plate face nail-holding ability greater than 1200N, the edges of boards nail-holding ability is greater than 850N, and the plate face nail-holding ability of common plate is less than 1100N, the edges of boards nail-holding ability is less than 900N; Engrave mill plate MOR greater than 32Mpa, elastic modelling quantity is greater than 3000Mpa, and the MOR of common plate is less than 30Mpa, elastic modelling quantity is less than 2800Mpa.