CN100434246C - Technique and equipment for lowering formaldehyde in procedure for processing lumber-core board - Google Patents
Technique and equipment for lowering formaldehyde in procedure for processing lumber-core board Download PDFInfo
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- CN100434246C CN100434246C CNB2004100659087A CN200410065908A CN100434246C CN 100434246 C CN100434246 C CN 100434246C CN B2004100659087 A CNB2004100659087 A CN B2004100659087A CN 200410065908 A CN200410065908 A CN 200410065908A CN 100434246 C CN100434246 C CN 100434246C
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Abstract
The present invention relates to an aldehyde reducing process and a device thereof which are disclosed in a processing procedure of a block board in the technical scheme, which belongs to the technical field of the processing of the block board. Adhesives used in the processing procedure of the block board are urea-formaldehyde resin adhesives and are prepared from 100 parts by weight of urea-formaldehyde resin adhesive, 20 to 35 parts by weight of filling agent, and 0.4 to 1.0 part by weight of solidifying agent; boards blanks on which glue spreading is carried out are spliced by a machine or pressed at high temperature, and then, the boards blanks are piled at intervals; negative pressure action is formed at the periphery of the board blanks piled at intervals through a blower, so that surrounding air can be led outside an operation area; a device for reducing the harmful ingredient of the adhesives in the block board is mainly composed of a ventilating pipeline and the blower, wherein the air inlets of the ventilating pipeline are positioned on the side surfaces of both sides of the board blanks piled at intervals, and the air outlet of the ventilating pipeline is positioned outside a processing filed. By adopting the present invention, free formaldehyde emitted when the resin adhesives are heated can be discharged fast and in time so as to prevent the free formaldehyde from being absorbed by a board core and a finished board, so that the content of the formaldehyde in products can be reduced, and the aging and piling time of the board blanks can be shortened so as to improve the working environment of a workshop greatly.
Description
Technical field
Technical solution of the present invention relates to the core-board processing technique field, specially refer in the procedure for processing lumber-core board free formaldehyde dispel technology with and the employed equipment of technology.
Background technology
In existing core-board process technology, urea-formaldehyde resin adhesive is often adopted in the processing of core-board, utilizes the advantage of urea-formaldehyde resin adhesive to be: with low cost, and the adhesive strength height, quick solidifying, easy to use.But because: 1, the reaction of the addition polycondensation of urea and formaldehyde is reversible reaction in the aqueous solution, always has free formaldehyde in the glue; 2, have methylene ether link in the resin, in hot pressing or sheet material use, can decompose generation formaldehyde, especially in acid medium and have under the condition that moisture exists, easier decomposition discharges formaldehyde; 3, in the resin curing process, easily form ehter bond between the methylol, decomposes discharges formaldehyde.Existence for above-mentioned reasons, the free formaldehyde release of core-board generally surpasses 1.5mg/L on the existing market, and according to the regulation of GB18580-2001, the core-board that free formaldehyde release surpasses 1.5mg/L is the E2 level, and being lower than 1.5mg/L is the E1 level.Have only the core-board that uses the E1 level as indoor ornament materials, just can not have a negative impact health.
For solving the existing too high problem of urea-formaldehyde resin adhesive free formaldehyde release, the common thinking of people is the lower adhesive of development free formaldehyde content, as the adhesive of U.S. nation board of NR123T model, the content of its free formaldehyde is 0.10%, burst size of methanal is 0.70mg/L.The lower low urea-formaldehyde resin adhesive of content, burst size of methanal that belongs to free formaldehyde, the adhesive of common urea-formaldehyde resin adhesive and low formaldehyde content is the contrast experiment, find the low common relatively adhesive of urea-formaldehyde resin adhesive, its curing rate is slow, thermal stress is high, the influence that can bring significant adverse to bonding strength, MOR, the surface quality of core-board, even make product can not meet the quality standard of GB/T5849-1999, thereby the production efficiency and the quality of core-board have been reduced.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of efficient higher, produce product quality better and the product free formaldehyde release be lower than 1.5mg/L core-board production method and for implementing a kind of aldehyde equipment that falls that this method provides.
The technical scheme that is provided of technical solution problem of the present invention is: the aldehyde reducing technics in the procedure for processing lumber-core board, whole process flow mainly comprises: making sheet, the system bar, matching board, gluing, jigsaw, hot pressing, sanding, paste dash board, these main processes of ageing, the employed adhesive of gluing process is a urea-formaldehyde resin adhesive, urea-formaldehyde resin adhesive is modulated as follows: low urea-formaldehyde resin adhesive 100 weight portions, filler 20-35 weight portion, the ratio modulation of curing agent 0.4-1.0 weight portion, described low urea-formaldehyde resin adhesive is meant the mol ratio F/U=1 of formaldehyde and urea: 1.20-1.15, pH value is between the 7.5-8.8, the urea-formaldehyde resin adhesive of content of free aldehyde≤0.18%, above-mentioned raw materials is implemented the gluing process after stirring, pile up at interval after the slab hot pressing after gluing is handled; And around the slab of piling up at interval, be provided with negative pressure region, the air in the negative pressure region can be led to outside the operation area, the slab of piling up is deposited 15-35 minute in negative pressure region at interval, and the temperature of slab at this moment between in reduce 7-12 ℃.The equipment that forms suction function and its surrounding air can be led to outside the operation area by fan action around the slab of piling up at interval is a kind of device that reduces adhesive harmful components in the core-board, it mainly is made up of ventilation shaft, blower fan, the ventilation shaft air inlet is positioned at the side, slab both sides of piling up at interval, the gas outlet of ventilation shaft is positioned at outside the processing site, fan delivery is a per hour cubic meter of 10000-20000, and blast is 350-450Pa.Slab is as the machine jigsaw behind the gluing of core-board sandwich layer or three layers of central layer after gluing hot pressing.
The gluing of the present invention in thin plank process used the adhesive modulation ratio and be can be: urea-formaldehyde resin adhesive 100 weight portions, filler 20-30 weight portion, curing agent 0.6-1.0 weight portion, and to adapt to the requirement of batten splicing to gluing.
Urea-formaldehyde resin adhesive 100 weight portions, filler 25-35 weight portion, curing agent 0.4-0.6 weight portion are to adapt to the requirement of poplar central layer to gluing.
Urea-formaldehyde resin adhesive 100 weight portions, filler 22-32 weight portion, curing agent 0.4-0.6 weight portion are to adapt to the requirement of dash board to gluing.
On the process conditions of prior art, according to the use of urea-formaldehyde resin adhesive and the relation of core-board burst size of methanal, characteristics in conjunction with heat pressing process are improved the impregnation technology of urea-formaldehyde resin adhesive, on the basis that guarantees the product bonding strength, can reduce free formaldehyde release as far as possible, cooperation with negative pressure region to hot pressing after the pressure cooling and the draught effect of slab, the free formaldehyde that distributes when adding hot gluing is in time discharged apace, avoid free formaldehyde to be absorbed by plate core and production board.Can in the weight portion scope that such scheme gives, suitably regulate according to the variation of changes of seasons, temperature, and in modulation urea-formaldehyde glue process, can also increase various formaldehyde catching agents.Consumption can add according to the requirement of different types of formaldehyde catching agent, reaches in coating technique, reduces the purpose of free formaldehyde as far as possible.Filler can be starchy materials such as flour, and curing agent is an ammonium chloride.In whole process of production, other technological requirement is same as the prior art.
Forming negative pressure region by fan action around the slab of piling up at interval: cooperate with negative pressure region to hot pressing after the pressure cooling and the draught effect of slab, the free formaldehyde that distributes when adding hot gluing is in time discharged apace, processing time is 20-25 minute, on average falling the aldehyde amount by the relative machine jigsaw of above-mentioned processing is 0.320mg/L, it is 0.523mg/L that the aldehyde amount on average falls in the three ply board base after the relative hot pressing, three ply board temperature after machine jigsaw and the hot pressing can descend 8-12 ℃, reduced thermal stress, shorten the ageing pilling up time of slab simultaneously, and improved the production environment in workshop.
This device has two ventilation shaft air inlets, is positioned at the side, slab both sides of piling up at interval.Make between two air inlets and form cooling chamber, under the prerequisite that reduces the slab free formaldehyde, also help the machine jigsaw that reduces behind the gluing or three layers of central layer temperature after gluing hot pressing.
Employed blower fan is a propeller fan, and propeller fan is installed in the top that is positioned at the ventilation shaft air inlet.
Owing to adopt technique scheme, the present invention can realize in the procedure for processing lumber-core board, 1, at the gluing modulation process, on the basis that guarantees the core-board bonding quality, reduce the content of finished product middle reaches from formaldehyde; 2, adopt the forced ventilation cooling to reduce the content of half-finished free formaldehyde, reach the purpose that reduces core-board finished product free formaldehyde content, reduce the digestion time of slab simultaneously, improve the efficient of making sheet, improved the production environment in workshop greatly.The bonding strength of the core-board that 3, the present invention produced, MOR, surface quality can meet the quality standard of GB/T5849-1999, can satisfy the E1 level regulation of GB18580-2001 simultaneously again.
Description of drawings
Fig. 1 is for falling aldehyde Refrigerator structure schematic diagram.
In the drawings: 1, ventilation shaft; 2, air inlet; 3, propeller fan; 4, slab.
The specific embodiment
The production technology of the processing core-board of each embodiment is successively: raw material drying, processing system bar, gluing matching board, machine jigsaw, forced ventilation are fallen aldehyde, a sanding, are pasted veneer, a precompressed, a hot pressing, secondary sanding, paste dash board, secondary precompressed, secondary hot pressing, forced ventilation and fall aldehyde, cutting edge, three sandings, check warehouse-in.Above-mentioned each process conditions are identical with the core-board processing conditions of prior art except that the forced ventilation aldehyde reducing technics.Once, the unit pressure of secondary precompressed and hot pressing is 1.2Mpa; Squeeze time is 25 minutes, and one time hot pressing temperature is 110-120 ℃, and the secondary hot pressing temperature is about 110 ℃; The dwell time of a hot pressing is 500 seconds,, dwell time of secondary hot pressing is about 42 seconds.
The employed urea-formaldehyde resin adhesive of gluing is the board NR123T of U.S. nation, and the board NR123T of U.S. nation urea-formaldehyde resin adhesive F/U=1: 1.20-1.15, pH value are between the 7.5-8.5, content of free aldehyde≤0.15%, and viscosity is 18-30S under 25 ℃ of conditions, solid content 〉=52%.Filler is a long patent flour.Formaldehyde catching agent is that the formaldehyde catching agent, the curing agent that encircle the JC-H type that good new material Science and Technology Ltd. produces by Nanjing of Nanjing Forestry University development is the ammonium chloride of technical grade.
For adapting to the requirement of different bonding woods, above-mentioned raw materials is stirred modulation, it has following embodiment.
Embodiment 1, and the modulation prescription that batten splices employed urea aldehyde gluing is (weight fraction): Lauxite 100, filler 20, formaldehyde catching agent 6, curing agent 0.6; The poplar central layer pastes the two sides of covering batten after splicing and forms middle layer plate, and the poplar central layer can be (weight fraction) Lauxite 100, filler 25, formaldehyde catching agent 6, curing agent 0.4 to the requirement of gluing; It is three ply board that dash board is sticked on middle layer plate two surfaces, and dash board to the requirement of gluing is: (weight fraction): Lauxite 100, filler 22, formaldehyde catching agent 6, curing agent 0.5.
Embodiment 3, and the prescription that batten splices employed urea aldehyde gluing can be (weight fraction): low formaldehyde emission uf resin 100, filler 27, curing agent 0.9; The poplar central layer can be (weight fraction) low formaldehyde emission uf resin 100, filler 33, curing agent 0.5 to the requirement of gluing; Dash board to the requirement of gluing is: (weight fraction): low formaldehyde emission uf resin 100, filler 28, curing agent 0.5.
Embodiment 4, and the prescription that batten splices employed urea aldehyde gluing is (weight fraction): low formaldehyde emission uf resin 100, filler 30, formaldehyde catching agent 5, curing agent 1.0; The poplar central layer is (weight fraction) Lauxite 100, filler 35, formaldehyde catching agent 10, curing agent 0.6 to the requirement of gluing; Dash board to the requirement of gluing is: (weight fraction): Lauxite 100, filler 30, formaldehyde catching agent 5, curing agent 0.6.The addition of embodiment 1,4 formaldehyde catching agents that added is to add according to the consumption of indicating in this product description.
Be described in further detail forcing cooling and ventilation technology below in conjunction with the embodiment accompanying drawing.
In conjunction with Fig. 1, it mainly is made up of ventilation shaft 1, blower fan 3, and in the present invention, it has the air inlet 2 of two ventilation shafts 1 to be positioned at the side, slab 4 both sides of piling up at interval, and the gas outlet of ventilation shaft 1 is positioned at outside the processing site.Employed blower fan is a propeller fan 3, and propeller fan 3 is installed in the top of air inlet 2.Propeller fan 3 is two, and correspondence is installed on the ventilation shaft 1 on air inlet 2 tops.Be negative pressure region between two air inlets 2, this zone forms a cooling chamber.Propeller fan 3 can be selected 2.2 kilowatts, rotating speed for use, and to be per second 1445 commentaries on classics, 600 millimeters of internal diameters, air quantity be 15000 cubic metres blower fan per hour.In whole procedure for processing lumber-core board, can use two said apparatus, wherein one is used for the middle layer plate that machine is pieced together is forced cooling and ventilation; Another is used for the three ply board that hot pressing is come out is forced cooling and ventilation.
When this device used, hot-forming three ply board was piled up 45 layers in a pile altogether at interval behind middle layer plate that machine behind the gluing is combined into and the gluing, and every interlayer is divided into 1.5cm.Shift the cooling chamber of 2 of air inlets onto by track, started propeller fan 25 minutes, blast is 395Pa in the cooling chamber, makes the middle layer plate that is in the cooling chamber or the three ply board of hot pressing force cooling channel.Since the three ply board of middle layer plate or hot pressing in a pile after, gas permeability is preferably arranged between flaggy, free formaldehyde is convenient in the suction of two propeller fans 3 and temperature is distributed.
According to the above core-board of producing, measure free formaldehyde release and bonding strength according to the method for GB/T17657-1999 regulation.The temp different measuring method is: middle layer plate or three ply board therefrom extract four before entering air blast cooling, press diagonal and measure initial temperature, after process equipment is air-cooled, once more same four plates are carried out with the some thermometric.
Table one, the free formaldehyde release of core-board production board and bonding strength
| Numbering | Free formaldehyde release mg/L | Average bonding strength Mpa |
| Embodiment 1 | 0.71 | 1.07 |
| |
0.89 | 1.10 |
| Embodiment 3 | 0.96 | 1.10 |
| Embodiment 4 | 0.85 | 1.08 |
Last table shows that the core-board burst size of methanal that the present invention produces meets the E1 level requirement of GB18580-2001 regulation, average bonding strength surpass the GB/T5849-1999 regulation 〉=requirement of 0.7MPa.After adding formaldehyde catching agent, be of value to the burst size that reduces free formaldehyde.
Table 2 is the temperature before and after middle layer plate and three ply board are handled through air blast cooling
Table 3 is the burst size of free formaldehyde before and after middle layer plate, three ply board are handled through air blast cooling
Show that by above-mentioned data thinking of the present invention is correct.In the above-described embodiment, the plate core of core-board is to adopt urea-formaldehyde resin adhesive to carry out glued and whole the slab forming in side in the jigsaw machine by little batten, the glue consumption of average every jigsaw about the 250-300 gram, must have free formaldehyde to discharge after curing greatly.Free formaldehyde is in the rate of release of the hot state rate of release greater than cold state.Therefore, the formaldehyde that slab discharges under hot state is discharged it rapidly with flow air, and the continuation that helps free formaldehyde discharges, and speed air flow is big more, and the retention layer of plate face is thin more, helps inner free formaldehyde more and outwards discharges, until balance.Avoided free formaldehyde accumulation in slab in manufacture process of slab, reduced the free formaldehyde of finished product and released content.Can also analyze the cooling-down effect of slab in negative pressure region by data is significantly, therefore can surely reduce the loss that the slab thermal stress causes, and helps balanced production, has also improved production environment simultaneously greatly.For shortening the production cycle and improving product bonding strength, MOR, surface quality very big benefit is arranged.
Claims (7)
1, aldehyde reducing technics in the procedure for processing lumber-core board, whole process flow mainly comprises: making sheet, the system bar, matching board, gluing, jigsaw, hot pressing, sanding, paste dash board, ageing process, the employed adhesive of gluing process is a urea-formaldehyde resin adhesive, it is characterized in that: urea-formaldehyde resin adhesive is modulated as follows: urea-formaldehyde resin adhesive 100 weight portions, filler 20-35 weight portion, the ratio modulation of curing agent 0.4-1.0 weight portion, described urea-formaldehyde resin adhesive is meant mol ratio F/U=1: 1.20-1.15, pH value is between the 7.5-8.8, the urea-formaldehyde resin adhesive of content of free aldehyde≤0.18%, above-mentioned raw materials is implemented the gluing process after stirring, the slab after gluing is handled is through piling up at interval after the hot pressing; Be provided with negative pressure region around the slab of piling up at interval, the air in the negative pressure region can be led to outside the operation area, and the slab of piling up is deposited 15-35 minute in negative pressure region at interval, and the temperature of slab at this moment between in reduce 7-12 ℃;
The employed equipment of described negative pressure region, mainly be made up of ventilation shaft, blower fan, the ventilation shaft air inlet is positioned at the side, slab both sides of piling up at interval, and the gas outlet of ventilation shaft is positioned at outside the processing site, fan delivery is a per hour cubic meter of 10000-20000, and blast is 350-450Pa.
2, the aldehyde reducing technics in the procedure for processing lumber-core board according to claim 1 is characterized in that: the adhesive modulation ratio that adapts to the batten splicing can be: urea-formaldehyde resin adhesive 100 weight portions, filler 20-30 weight portion, curing agent 0.6-1.0 weight portion.
3, the aldehyde reducing technics in the procedure for processing lumber-core board according to claim 1 is characterized in that: adapt to poplar central layer adhesive modulation ratio and can be: urea-formaldehyde resin adhesive 100 weight portions, filler 25-35 weight portion, curing agent 0.4-0.6 weight portion.
4, the aldehyde reducing technics in the procedure for processing lumber-core board according to claim 1 is characterized in that: adapt to dash board adhesive modulation ratio and can be: low formaldehyde emission uf resin glue 100 weight portions, filler 22-32 weight portion, curing agent 0.4-0.6 weight portion.
5, according to the aldehyde reducing technics in the described procedure for processing lumber-core board of the arbitrary claim of claim 1 to 4, it is characterized in that: in modulation urea-formaldehyde glue process, increase formaldehyde catching agent.
6, the aldehyde reducing technics in the procedure for processing lumber-core board according to claim 1 is characterized in that: the processing time by fan action formation negative pressure region around the slab of piling up at interval is 20-35 minute.
7, according to the aldehyde reducing technics in claim 1 or the 6 described procedure for processing lumber-core board, it is characterized in that: employed blower fan is a propeller fan, and propeller fan is installed in the top that is positioned at the ventilation shaft air inlet.
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| CNB2004100659087A CN100434246C (en) | 2004-12-23 | 2004-12-23 | Technique and equipment for lowering formaldehyde in procedure for processing lumber-core board |
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| CNB2004100659087A CN100434246C (en) | 2004-12-23 | 2004-12-23 | Technique and equipment for lowering formaldehyde in procedure for processing lumber-core board |
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| CN1796070A CN1796070A (en) | 2006-07-05 |
| CN100434246C true CN100434246C (en) | 2008-11-19 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104786297B (en) * | 2015-03-30 | 2017-02-01 | 广西宾阳县荣良新材料科技有限公司 | Production method for catching agent lowering formaldehyde in wood board |
| CN104760096B (en) * | 2015-03-30 | 2017-05-03 | 广西宾阳县荣良新材料科技有限公司 | Production method of anticorrosion low-formaldehyde composite solid wood floor |
| CN105587096A (en) * | 2016-03-15 | 2016-05-18 | 上海富翊装饰工程股份有限公司 | Manufacturing process for consolidated composite floor |
| CN106042084B (en) * | 2016-05-24 | 2018-07-06 | 安徽东平木业股份有限公司 | Plywood machining production line |
| CN109227810A (en) * | 2018-09-30 | 2019-01-18 | 柳州市亚森木业有限公司 | A kind of equipment for core-board processing technology |
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| JP2000061913A (en) * | 1998-08-25 | 2000-02-29 | Matsushita Electric Works Ltd | Binder application device |
| CN2510282Y (en) * | 2001-10-31 | 2002-09-11 | 卢铭津 | Paster for decorating surface |
| JP2003191338A (en) * | 2001-12-26 | 2003-07-08 | Santo Shoji Kk | Method for manufacturing wear resistant sheet and method for wear resistance performing using the same |
| JP2004300423A (en) * | 2003-03-14 | 2004-10-28 | Asahi Kasei Chemicals Corp | Antistatic coating composition |
| JP2004323649A (en) * | 2003-04-24 | 2004-11-18 | Sanwa Cellulosin Kk | Molding material and molded article |
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- 2004-12-23 CN CNB2004100659087A patent/CN100434246C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000061913A (en) * | 1998-08-25 | 2000-02-29 | Matsushita Electric Works Ltd | Binder application device |
| CN2510282Y (en) * | 2001-10-31 | 2002-09-11 | 卢铭津 | Paster for decorating surface |
| JP2003191338A (en) * | 2001-12-26 | 2003-07-08 | Santo Shoji Kk | Method for manufacturing wear resistant sheet and method for wear resistance performing using the same |
| JP2004300423A (en) * | 2003-03-14 | 2004-10-28 | Asahi Kasei Chemicals Corp | Antistatic coating composition |
| JP2004323649A (en) * | 2003-04-24 | 2004-11-18 | Sanwa Cellulosin Kk | Molding material and molded article |
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