CN1066811A - The technology of substituting water-proof agent by wooden plasticizing to produce shaving board - Google Patents
The technology of substituting water-proof agent by wooden plasticizing to produce shaving board Download PDFInfo
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- CN1066811A CN1066811A CN 92101047 CN92101047A CN1066811A CN 1066811 A CN1066811 A CN 1066811A CN 92101047 CN92101047 CN 92101047 CN 92101047 A CN92101047 A CN 92101047A CN 1066811 A CN1066811 A CN 1066811A
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Abstract
The present invention relates to the technology of substituting water-proof agent by wooden plasticizing to produce shaving board, gauge thickness according to particieboard, in hot pressing process, press high pressure, middle pressure, low pressure selection hot pressing temperature and time, it is characterized in that, adopt wooden self plasticizing to replace paraffin water repellent, 170 ℃-175 ℃ of the hot pressing temperatures of wooden plasticizing are satisfied in selection, the hot pressing time of high pressure 〉=1.5 minute, the hot pressing time of middle pressure 〉=2 minute, the hot pressing time of low pressure 〉=3 minute, the pressure of high pressure phase is 1.96-3.43MPa.Advantage of the present invention is to reduce cost, and saves material, and water resistance is stable, has good economic benefit and practicality.
Description
The present invention relates to produce the technology of the technology of particieboard, particularly substituting water-proof agent by wooden plasticizing to produce shaving board.
At present, the technological process of producing particieboard is through chipping, pressing the sandwich layer wood shavings behind the flaking, drying, screening and separate with the top layer wood shavings with raw material, the top layer wood shavings need be polished, carry out glue mixing then respectively, through the raw material of glue mixing by mat formation, precompressed, transversal, plywood, branch plate, all operations of saw plate make finished product, classification is put in storage through checking after.For quality and the product qualified rate that guarantees particieboard, the water absorption rate and the swollen rate of rising of thickness that reduce particieboard are crucial.Notice, swollen the rising that absorb water is to cause the unsettled main cause of particieboard volume, it has limited the range of application of particieboard.Usually the way that solves is to add paraffin water repellent in the process of producing particieboard, in order to improve the water proofing property of particieboard.Facts have proved, in particieboard, add the waterproof measure that paraffin wax material (olefin material that comprises solid, liquid, emulsion) can only play temporary property, and along with service time lengthening or paraffin wax additives excessive all can make the water resistance of particieboard descend or reduce the intensity of particieboard self, this is to deserve careful attention and improved.Also have a kind of solution route, use the acetylation technology of improving solid wood stability can be used for reducing the thickness swelling of particieboard, effect is better; persistence is long; but the cost height of this acetylizad waterproof measure needs newly added equipment, and manufacturer is improved current technology restriction.As for steam treated, the Technology for Heating Processing of sheet material, though effective, all exist and strengthen production cost, increase the deficiency of process equipment and difficulty.
The objective of the invention is at the deficiencies in the prior art, existing particieboard production technology is improved, propose a kind of wooden technology that replaces paraffin water repellent production particieboard that self plastifies of using.
Technical solution of the present invention is, gauge thickness according to particieboard, in the hot pressing process of producing particieboard, press high pressure, middle pressure, low pressure three phases selection hot pressing temperature and time, it is characterized in that, adopt wooden self plasticizing to replace paraffin water repellent, selection makes 170 ℃-175 ℃ of the hot pressing temperatures of the wooden plasticizing of particieboard, the hot pressing time of high pressure phase 〉=1.5 minute, in hot pressing time 〉=2 minute in pressure stage, the hot pressing time of periods of low pressure 〉=3 minute, the pressure of high pressure phase is chosen in 1.96-3.43MPa.This technology mainly is applicable to have high, medium and low pressure controlled multi-daylight press of three stages (this is the key equipment of current production particieboard).Lignin in this technological basis timber, hemicellulose heat fused " brooming moulding " principle, guarantee that in heat pressing process slab middle level heating temperature reaches more than 160 ℃, and there is time enough to make lignin, hemicellulose fully melt, flow exhibition, uniform, so just can produce high-intensity particieboard product, as everyone knows, particieboard adopts the glue mixing wood shavings hot-forming, and it relies on sizing material under the effect of suitable temperature, pressure, fusing, stream exhibition, curing molding.Show from applicant's research and experiment situation, for main component cellulose, hemicellulose and lignin in the timber, they have different fusing points, lignin is unformed polymer substance, no definite melting point, when having water to exist, just can soften more than 100 ℃, generally can melt more than 160 ℃.Hemicellulose is that the condensation product of half carbohydrates such as wood sugar, Chinese wax myron sugar, glucose, arabinose, galactolipin, glucuronic acid, galacturonic acid constitutes.Hemicellulose is under electron microscope, and what have is fiber, and what have is spherical particle, and what have is unformed material.Between cellulose and starch, the energy force rate fiber of moisture absorption, swollen is strong, generally just can melt at 160 ℃, the high more stream malleability of temperature is good more, when the increase of cellulose plasticity, lignin and hemicellulose fusing, the three contacts blending, intermolecular mutual diffusion, the interface dwindles gradually, adds the external force effect, the interface finally disappears, just can play the part cementation in wood shavings, its blow thing can seal wooden pit, play waterproof action, the effect of Here it is substituting water-proof agent by wooden plasticizing.Give full play to the effect of this wooden plasticizing adhesion, selection to temperature, pressure during hot pressing has certain requirement, and guarantee to have time enough to make the degree of hemicellulose and lignin fusing in the slab, usually the slab heat transmission resistance is big, if temperature is low excessively, the time is to obtain due effect inadequately.In the production technology of particieboard, hot pressing temperature generally should be controlled at 160 ℃-200 ℃, the pressure of high pressure phase is according to thickness of slab and density requirements control, generally be controlled between the 1.96-3.43MPa, the temperature of slab sandwich layer increases with the increase of hot pressing time, and is approaching to the top layer at last, as shown in Figure 1, evidence, the sandwich layer material that make the wood shavings slab reaches fusion temperature fully and " brooming " is to need time enough.In actual production, increase hot pressing time and can reduce yield of unit time, thereby the ability that must make full use of press improves hot pressing temperature simultaneously, and make increasing of core layer temperature, thereby " brooming " on expansion section district, the physics characteristic of the feasible particieboard of producing is improved.
The invention has the advantages that, do not add paraffin water repellent, it is stable that water resistance still can keep.The sample that uses the present invention to produce finds that after testing thickness swelling rate is (1.96-2.3) %, the water proofing property that blow things such as lignin seal wooden pit is permanent, the defective of temporary transient water proofing property of paraffin water repellent and the deficiency that reduces the sheet material glue-joint strength have been eliminated, and the blow thing of this wooden plasticizing can play the effect of part adhesive, therefore use the present invention can reduce the glue consumption about 16% of product, only these two raw-material reducing expenses can make the production cost of every cubic metre of particieboard reduce 10%-15%.Because the plasticizing rate of wooden flake board increases, resilience is reduced, thereby strengthened the stability of particieboard on the other hand, obviously reduced the buckling deformation of particieboard.Application of the present invention, found a kind of practicable approach for not adding waterproofing agent production particieboard, the finished product particieboard of producing can meet country-level product quality examination criteria fully, the equipment and the waterproofing agent material of preparation waterproofing agent have also correspondingly been deducted simultaneously, reduced energy resource consumption, reduced the production cost of particieboard, had good economic benefits and practicality, the production technology of promoting this particieboard will help the secondary operations and the deep processing of particieboard.
Fig. 1, temperature-time performance diagram in slab during hot pressing;
Fig. 2, the hot pressing curve contrast figure of the present invention and existing technology;
Fig. 3, the Chipboard density analysis figure of use the present invention and existing explained hereafter.
The existing embodiments of the invention that further describe with reference to the accompanying drawings.
As Fig. 1, Fig. 2, Fig. 3, shown in, use the present invention to process the particieboard of 19 millimeters and 16 millimeters thickness, in the hot pressing process of producing particieboard, press high pressure, middle pressure, low pressure three phases selection hot pressing temperature, hot pressing time according to the gauge thickness of particieboard.It is 170 ℃-175 ℃ that selection makes the hot pressing temperature of the wooden plasticizing of particieboard, and optimum temperature can be controlled in 170 ℃-174 ℃.For 19 millimeters specification particieboards, the hot pressing time of high pressure phase, it is 4 minutes, the hot pressing time in middle pressure stage is 4 minutes, the hot pressing time of periods of low pressure is 5 minutes, particieboard for 16 millimeters specifications, the hot pressing time of high pressure phase is 3 minutes, the hot pressing time in middle pressure stage is 3 minutes, the hot pressing time of periods of low pressure is 4 minutes, and the pressure of the high pressure phase of the particieboard of two kinds of specifications is chosen as 2.35MPa, and the pressure in middle pressure stage is 1.18MPa, the pressure of periods of low pressure is 0.2MPa, and concrete hot pressing parameters is listed as follows:
| Side card thickness (millimeter) | 19 | 16 | ||||
| Pressure stage | High pressure | The middle pressure | Low pressure | High pressure | The middle pressure | Low pressure |
| Unit pressure (MPa) | 2.35 | 1.18 | 0.2 | 2.35 | 1.18 | 0.2 |
| Hot pressing time (minute) | 4 | 4 | 5 | 3 | 3 | 4 |
| Hot pressing temperature (℃) | 170-175 | 170-175 | ||||
The present invention is applicable to have high, medium and low pressure controlled multi-daylight press of three stages, produce the particieboard of other specification, except that hot pressing time and the suitable adjustment of unit pressure, hot pressing temperature still remains between 170 ℃-175 ℃, the middle level heating temperature of guaranteeing the particle mat processed like this reaches more than 160 ℃, thereby make its wooden plasticizing, realization does not add paraffin water repellent and produces qualified particieboard product.Hot-pressing process curve of the present invention 3 as shown in Figure 2 and existing technology hot pressing curve 4 have tangible difference, be that the present invention has done great adjustment to the particieboard pressure of the phase I (high pressure phase) in hot pressing, the existing technology of temperature and time, this adjustment brings good effect, and every test rating of its product all reaches and surpasses forest department about primes wood-based plate specified standard.Below according to the sample detection result of the present invention and existing explained hereafter:
| Test item | Existing technology | The present invention | Country-level product standard |
| Density g/cm | 0.75 | 0.81 | 0.5-0.85 |
| Moisture content % | 5.99 | 8.5 | 5-11 |
| Plane tensile strength N/mm | 0.485 | 0.81 | ≥0.4 |
| MOR N/mm | 24.6 | 24.8 | ≥18 |
| Thickness swelling rate % | 14.28 | 2.3 | ≤6 |
| Elastic modelling quantity N/mm | 2252 | ≥2000 | |
| Vertical panel face nail-holding ability N | 2307 | ≥1100 | |
| Parallel-plate face nail-holding ability N | 1958 | ≥700 |
Particieboard according to the present invention produces is having following obvious characteristics aspect outward appearance, section and the physical and mechanical property:
1, top layer and sandwich layer density reach unanimity, be that watch core layer gradient reduces, as shown in Figure 3, so just be conducive to improve the intensity of particieboard and the ability of holding nail, can find out that from detection case its nail-holding ability almost is 2-3 times of national standard primes setting, so just greatly improve the processing characteristics of particieboard, had more special meaning because well hold the nail ability in furniture production.
2, the sandwich layer wood shavings are tightr, not only improve the plane tensile strength (for 2 times of country-level product setting) of wood shavings, more are conducive to improve simultaneously the water resistance of particieboard.
3, test and test shows do not add paraffin water repellent, and water resistance is stable, thickness swelling rate only is 1.92.3%, this is because it is nonvolatil that blow things such as lignin seal wooden pit water proofing property, and the water proofing property of paraffin water repellent is temporary transient, and also will reduce glue-joint strength.It also is considerable using wooden self economic benefit of being produced of plasticizing, calculates by 1% of dried wood shavings weight with the paraffin emulsion addition, and required paraffin, oleic acid, ammonia volume and converted expenses are as follows:
| Kind | Unit price (unit/kilogram) | Consumption (kilogram/m plate) | Total amount (unit) |
| Paraffin | 2.6 | 7 | 18.2 |
| Oleic acid | 5.8 | 1.03 | 5.92 |
| Ammoniacal liquor | 1.8 | 1.4 | 2.52 |
| Add up to | 26.69 |
Promptly do not add paraffin water repellent and produce particieboard, every cubic metre of particieboard can reduce by 26.69 yuan cost, every cubic metre Chipboard can reduce the kilogram with glue 10-15 in addition, press 2.3 yuan of calculating of per kilogram, be 23-34 unit, the summation of two expenses can make every cubic metre of Chipboard 40-60 unit that reduces cost.
4, because the plasticizing rate of wood particle strengthens resilience is reduced, strengthened the stability of particieboard, significantly reduced the buckling deformation of particieboard.
Claims (3)
1, the technology of substituting water-proof agent by wooden plasticizing to produce shaving board, be according to the gauge thickness of particieboard in the hot pressing process of producing particieboard, press high pressure, middle pressure, low pressure three phases selection hot pressing temperature, hot pressing time, it is characterized in that, adopt wooden self plasticizing to replace paraffin water repellent, selection makes 170 ℃-175 ℃ of the wooden hot pressing temperatures that self plastifies of particieboard, the hot pressing time of high pressure phase 〉=1.5 minute, in hot pressing time 〉=2 minute in pressure stage, the hot pressing time of periods of low pressure 〉=3 minute, the pressure of high pressure phase is chosen in 1.96-3.43MPa.
2, the technology of substituting water-proof agent by wooden plasticizing to produce shaving board according to claim 1, it is characterized in that, produce the particieboard of 19 millimeters gauge thickness, in hot pressing process, selecting the hot pressing time of high pressure phase is 4 minutes, and the unit pressure of hot pressing is 2.35MPa, the hot pressing time in middle pressure stage is 4 minutes, middle unit pressure of pressing is 1.18MPa, and the hot pressing time of periods of low pressure is 5 minutes, and the unit pressure of hot pressing is 0.2MPa.
3, the technology of substituting water-proof agent by wooden plasticizing to produce shaving board according to claim 1, it is characterized in that, produce the particieboard of 16mm gauge thickness, in hot pressing process, the hot pressing time of high pressure phase is 3 minutes, and the unit pressure of hot pressing is 2.3MPa, the hot pressing time in middle pressure stage is 3 minutes, the unit pressure of hot pressing is 1.18MPa, and the hot pressing time of periods of low pressure is 5 minutes, and the unit pressure of hot pressing is 0.2MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92101047 CN1031181C (en) | 1992-02-18 | 1992-02-18 | Technology for substituting water-proof agent by wooden plasticizing to produce shaving board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92101047 CN1031181C (en) | 1992-02-18 | 1992-02-18 | Technology for substituting water-proof agent by wooden plasticizing to produce shaving board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1066811A true CN1066811A (en) | 1992-12-09 |
| CN1031181C CN1031181C (en) | 1996-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92101047 Expired - Fee Related CN1031181C (en) | 1992-02-18 | 1992-02-18 | Technology for substituting water-proof agent by wooden plasticizing to produce shaving board |
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| Country | Link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101670604B (en) * | 2008-09-08 | 2011-09-07 | 富朗投资管理集团(香港)有限公司 | Processing technology for manufacturing board by utilizing crop straws |
| CN101670608B (en) * | 2008-09-08 | 2011-11-16 | 富朗投资管理集团(香港)有限公司 | Hot-pressing technology for manufacturing board by utilizing crop straws |
| CN109203171A (en) * | 2018-09-28 | 2019-01-15 | 成都市荣胜木业有限公司 | A kind of composite board and its once hot pressing technique |
| CN109249660A (en) * | 2018-09-28 | 2019-01-22 | 成都市荣胜木业有限公司 | A kind of composite board and its manufacturing method |
-
1992
- 1992-02-18 CN CN 92101047 patent/CN1031181C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101670604B (en) * | 2008-09-08 | 2011-09-07 | 富朗投资管理集团(香港)有限公司 | Processing technology for manufacturing board by utilizing crop straws |
| CN101670608B (en) * | 2008-09-08 | 2011-11-16 | 富朗投资管理集团(香港)有限公司 | Hot-pressing technology for manufacturing board by utilizing crop straws |
| CN109203171A (en) * | 2018-09-28 | 2019-01-15 | 成都市荣胜木业有限公司 | A kind of composite board and its once hot pressing technique |
| CN109249660A (en) * | 2018-09-28 | 2019-01-22 | 成都市荣胜木业有限公司 | A kind of composite board and its manufacturing method |
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| Publication number | Publication date |
|---|---|
| CN1031181C (en) | 1996-03-06 |
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