CN101298159B - Processing technique of medium density fiber plate suitable for routing board - Google Patents
Processing technique of medium density fiber plate suitable for routing board Download PDFInfo
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- CN101298159B CN101298159B CN2008101241993A CN200810124199A CN101298159B CN 101298159 B CN101298159 B CN 101298159B CN 2008101241993 A CN2008101241993 A CN 2008101241993A CN 200810124199 A CN200810124199 A CN 200810124199A CN 101298159 B CN101298159 B CN 101298159B
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Abstract
The invention provides a processing technology for a routing plate, comprising the processing steps as follows: chipping and selecting of wood, pre-steaming and steaming, fiber separation, preparing the E1-class urea-formaldehyde, preparing the curing agent, adding the urea-formaldehyde, curing agent and paraffin, drying the fiber of the added the urea-formaldehyde, curing agent and paraffin, uniformly paving the dried wood fiber and smoothly pre-pressing the wood fiber under the pressure of 3.0-5.0MPa, heat pressing under the temperature of 180-185 DEG C, cooling, quenching and tempering, sanding and sawing, classifying and packaging. The plate prepared by the process has reasonably distributed density, moderate strength and low release quantity of formaldehyde.
Description
One, technical field
The invention belongs to the wood-based plate manufacture field, particularly a kind of being applicable to engraved the medium density fibre board (MDF) manufacturing process of milling plate processing.
Two, background technology
Prior art: China's wood-based plate was obtained very big development in recent years, and 2006 above 7,000 ten thousand m
3, market competition is very severe; Along with the day by day raising of people, pay close attention to the environmental protection wood-based panel product of functional form more and more to environmental consciousness, health perception and living awareness.In order to adapt to this development trend, further tap the potential of enterprises, create bigger profit, I take charge of to have developed and am adapted to engrave the functional form E1 level MDF that mills, and drop into and produce in batches.MDF in the past is often because Density Distribution is reasonable inadequately, and timber intensity is on the low side or higher and burst size of methanal is too high or the like former thereby do not fit into to engrave and mill.
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 being applicable to engraved the medium density fibre board (MDF) manufacturing process of milling plate processing, 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% ,≤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, adjust pH to 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 the back that finishes and adds 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, in 40～45 second time, boosted 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, pressure is got to 160bar for beating secondary high-pressure from 38bar, and 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, last drop to the end through the pressure of 38 seconds press again; 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.
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.
Four, description of drawings
Fig. 1 is the thermal buckling line chart;
Fig. 2 is a profile density distribution experimental result sectional drawing.
Explaining of profile density distribution experimental result: the profile density curve has shown the internal performance of plate intuitively, and density curve has been controlled well, and the quality of plate has also just had guarantee. Can be divided into i.e. two high density areas in 5 zones on the profile density curve of accompanying drawing, two high density are to the low-density transition region, a low density area. This experiment model as can be seen from Figure: averag density is 790.14kg/m3, the high density of top and bottom is 1127.77kg/m3And 1137.33kg/m3, minimum density is 683.43kg/m3, account for 86.49% of averag density. High density area has kept certain altitude and thickness, guarantees MOR and the plate face smoothness of plank. High density area is naturally mild to the low density area transition. Low density area has kept certain altitude, can guarantee again the internal bond strength of plank, illustrates that the polycondensation reaction of plank internal sizes stick is abundant, and solidification effect is better.
Five, the specific embodiment
Embodiment 1:
A kind of being applicable to engraved the medium density fibre board (MDF) manufacturing process of milling plate processing, 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 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, adjust pH to 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 the back that finishes and adds 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, in 40～45 second time, boosted 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, pressure is got to 160bar for beating secondary high-pressure from 38bar, and 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, last drop to the end through the pressure of 38 seconds press again; 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 being applicable to engraved the medium density fibre board (MDF) manufacturing process of milling plate processing, 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 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, adjust pH to 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 the back that finishes and adds 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, in 40～45 second time, boosted 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, pressure is got to 160bar for beating secondary high-pressure from 38bar, and 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, last drop to the end through the pressure of 38 seconds press again; 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 being applicable to engraved the medium density fibre board (MDF) manufacturing process of milling plate processing, 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 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, adjust pH to 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 the back that finishes and adds the UF modifier solution, is incubated 10 minutes, and temperature is controlled at 87 ℃; 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, in 40～45 second time, boosted 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, pressure is got to 160bar for beating secondary high-pressure from 38bar, and 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, last drop to the end through the pressure of 38 seconds press again; 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.
A kind of being applicable to engraved the medium density fibre board (MDF) manufacturing process of milling plate processing, 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% ,≤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, adjust pH to 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 the back that finishes and adds 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, in 40～45 second time, boosted 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, pressure is got to 160bar for beating secondary high-pressure from 38bar, and 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, last drop to the end through the pressure of 38 seconds press again; 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.
Claims (1)
1. one kind is applicable to and engraves the medium density fibre board (MDF) manufacturing process of milling plate processing, it is characterized in that procedure of processing is:
A. the chipping and screening of timber: the seeds that proportion is close, chip into wood chip of uniform size;
B. 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 ℃;
C. 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 d.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, adjust pH to 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 the back that finishes and adds 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;
E. the preparation of curing agent: the mixed aqueous solution of preparation phosphoric acid, methenamine, triethanolamine and ammonium sulfate, phosphoric acid wherein: 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;
F. 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;
G. the fiber that added urea-formaldehyde glue, adhesive and paraffin is carried out drying, dried fiber moisture is: 9～10%;
H. dried wood-fibred is mated formation evenly, and under 3.0～5.0MPa pressure, flatten in advance;
I. under 180～185 ℃ of conditions, carry out hot pressing, hot pressing: slab is imported in the hot press, in 40～45 second time, boosted 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, pressure is got to 160bar for beating secondary high-pressure from 38bar, and 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, last drop to the end through the pressure of 38 seconds press again;
J. cooling and modified: the plate temperature is cooled to 60 ℃, and stacking is modified to eliminate the plate internal stress;
K. sanding and sawing: sander is sawn to required size after with the hair plates sanding surface;
L. grade and pack.
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| CN102407553A (en) * | 2010-09-21 | 2012-04-11 | 大亚科技股份有限公司 | Manufacturing method of high density fiberboard for whitened type E1 grade floor substrate |
| CN103085147B (en) * | 2011-11-02 | 2014-12-17 | 大亚人造板集团有限公司 | Production method of medium- and high-density fiberboard ultralow in formaldehyde emission |
| CN103128826B (en) * | 2011-11-24 | 2015-04-15 | 大亚人造板集团有限公司 | Manufacturing technique of highlight floor base material |
| CN103128822B (en) * | 2011-11-24 | 2015-01-28 | 大亚木业（茂名）有限公司 | Production process for bright-surface floor base material with height of 12mm |
| CN102704308A (en) * | 2012-05-09 | 2012-10-03 | 大亚木业(江西)有限公司 | Artificial board fiber separation process capable of prolonging service lives of abrasive discs |
| CN103333633A (en) * | 2013-07-04 | 2013-10-02 | 无锡木佳新材料科技有限公司 | Curing agent of urea-formaldehyde resin adhesive applicable in dry process fiberboards and particleboards |
| CN103737699A (en) * | 2014-01-10 | 2014-04-23 | 宁波大世界家具研发有限公司 | Specially shaped wood fiber molded product enclosed forming method |
| CN105479580B (en) * | 2015-11-18 | 2018-06-15 | 广西大学 | A kind of Eucalyptus engraves milling fiberboard and its manufacturing method |
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| CN1149524A (en) * | 1995-11-07 | 1997-05-14 | 李永青 | Eucalyptus medium-density fibre board |
| CN1160625A (en) * | 1997-03-03 | 1997-10-01 | 安久维 | Medium-density fibreboard producing method and product |
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