CN1348851A - Steam spraying and vacuum hot pressing formation process of wooden or non-wooden composite material - Google Patents
Steam spraying and vacuum hot pressing formation process of wooden or non-wooden composite material Download PDFInfo
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- CN1348851A CN1348851A CN 00130728 CN00130728A CN1348851A CN 1348851 A CN1348851 A CN 1348851A CN 00130728 CN00130728 CN 00130728 CN 00130728 A CN00130728 A CN 00130728A CN 1348851 A CN1348851 A CN 1348851A
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Abstract
The present invention relates to steam jet spraying-vacuum hot press shaping method for wood or non-wood composite material, In said method thermocompressor having jet steaming-vacuum system is used, during hot pressing, the wood or non-wood composite material plate blank is pressed to certain density, then directly heated by jet staming-vacuum steam, to make the plate blank core large quickly heated to solidifying temperature of adhesive, using vacuum to extract the condensed water, said method reduces hot press time of plate blank, improves the density distribution and stability of finished plate, raises the efficiency of equipment and lowers the free aldehyde content.
Description
A kind of steam spraying-vacuum hot pressing formation process of wooden or non-composite wooden material the present invention relates to a kind of steam spraying-vacuum hot pressing formation process of wooden or non-composite wooden material, belongs to the technical field of wood-based panel industry.
In the manufacturing process of wooden or non-composite wooden material, owing to used heat cured adhesive made of synthetic resin, need be to slab pressurization and heating, adhesive in the slab is solidified at a certain temperature and obtain certain thickness finished product, traditional mode of heating be heat by heating platen and slab contact surface in hot pressing progressively from the top layer to the transmission of slab sandwich layer, form the thermograde of slab in the hot pressing process, adhesive solidification is carried out inwards by table in the slab, and, heat needs certain pressure because transmitting inwards from steel slab surface, so under this pressure, steel slab surface at first is compressed, and be compressed behind the sandwich layer, easily form the phenomenon of slab top layer and sandwich layer density unevenness, general top layer density is big, and sandwich layer density is little.Surface layer adhesive has cured when particularly pressing slab, and core layer temperature is also very low, and when the sandwich layer adhesive curing, surface layer adhesive is aging, so the conventional hot-press method can't be produced the slab of high-quality.Sheet material processing and serviceability are affected, because free aldehyde is present in the production board, environment for use are also polluted simultaneously.Chinese patent ZL92244255 and ZL9922941.0 have proposed the manufacture method of two kinds of steam spraying hot presses, just proposed and to have made wooden or non-composite wooden material with spray steaming-vacuum hotpressing mode, the objective of the invention is to propose the specific implementation method of employing steam spraying-vacuum hot pressing formation, has only the method for using the present invention to propose, could have on the hot press of steam spraying-vacuum plant, with the hot pressing time of conventional hot-press method 1/3～1/5, produce thicker than the conventional hot-press mode, density is even, the surface cure layer is thin, wooden or the non-composite wooden material that content of free aldehyde is low comes.
According to method of the present invention, wooden or non-wooden material's slab is 6%～13% at drying to moisture content, and becomes slab to send into through paving prefabricating to have steam spraying---behind the hot press of vacuum plant, must Fast Compression becoming density is 0.3～0.5 slab.
According to method of the present invention, wooden and non-wooden material's slab must spray into 4～16kg/cm by the aperture that spray is steamed in the pressing plate in slab after being compressed to 0.3～0.5 slab
2Steam, make the slab sandwich layer in 30 seconds, be raised to 90～180 ℃, be as the criterion with the solidification temperature of adhesive.
According to method of the present invention, wooden and non-wooden material's slab is spraying into certain steam and board briquette is raised to after 90～180 ℃, utilize again vacuum system from the two sides or single face vacuumize, extract condensing water vapor in the slab and the residual free aldehyde behind the adhesive solidification out.
According to method of the present invention, the temperature of hot press pressing plate should be higher than the temperature that steam is steamed in spray all the time, and the steam that is used to spray steaming can be saturated vapor or superheated steam.The medium that is used for the heat hot platen can be steam or other organic heat carrier.Hot press pressure with certain rules is arranged on spray steaming opportunity, the opportunity of vacuumizing, can only vacuumize during pressurization, can spray when stopping to pressurize and steam or vacuumize, different according to slab material and plate kind, plate density, adhesive kind can be adjusted the time that hot pressing curve and spray are steamed and vacuumized.
According to method of the present invention, different according to material, plate kind, adhesive kind with plate density, can adopt different sprays to steam---vacuum mode: (1) slab two sides is sprayed steaming simultaneously and is vacuumized simultaneously then.(2) one side spray steaming while another side vacuumizes.(3) single face spray steams then that single face vacuumizes.(4) steaming one side spray steaming is then sprayed on the two sides simultaneously, and one side vacuumizes, and steaming is sprayed on the two sides simultaneously again, and the two sides vacuumizes simultaneously then.In above the whole bag of tricks, the pressure duration that steam is steamed in spray also changes along with the variation of slab density and adhesive kind.
According to method of the present invention, can be applicable to all wood-based plate kinds such as pressboard, particieboard, glued board, laminated veneer lumber, fiber particle moulding goods, the raw material of its use can be broadleaf, softwood, bamboo wood and agricultural wastes wooden or non-lignocellulose plant fibre materials such as (as bagasse, straw, wheat tangerine, wastes of flax etc.).
According to method of the present invention, the adhesive of wooden and non-composite wooden material, can be pollopas, melmac, phenolic resins, isocyanates, lignin, spontaneous gum resin and other thermosetting resin and composition thereof, when being applied to the hot pressing of the spontaneous gluing composite of lignin, because steam injects slab wood fibre moisture content is increased, thereby lignin self glass transition temperature reduces, and can obtain the lower lignin of fragility from the rubber composite product.
According to method of the present invention, because hot pressing pressure process is progressively to pressurize, when slab density is 0.3～0.5, pressurization stops, in slab, inject steam, sandwich layer is rapidly heated and compresses, so production board watch core layer density differs little, be evenly distributed, its machining property is better than the production board of conventional hot-press method processing.Production board sanding amount is little, and production cost is low than the conventional hot-press method, and the production board moisture content is 6%～8% simultaneously, and near the natural equilibrium moisture content, the good stability of plate, surface toughness are better than the plate that the conventional hot-press mode is made.Owing to adopt the mode that repeatedly vacuumizes, taken out the residual free aldehyde in the slab, so be easy to obtain the sheet material of environmental protection level.
The thick particieboard of example 1:70mm is executed urine aldehyde glue amount and is 11% the manual slab of mating formation into 1000 * 1000 * 182mm of masson pine wood shavings, moisture content 10%, design density 620kg/cm
2, the hot pressing machine side is pressed 25kg/cm
2, 170 ℃ of platen temperatures, slab are sent into and be forced into slab density behind the press is 400kg/cm
2, steam pressure 7kg/cm was steamed in the two sides spray 40 seconds
2, the two sides vacuumized 20 seconds, and being pressurized to density is 580kg/cm
2, steam pressure 7kg/cm was steamed in two sides spray for the second time 40 seconds
2, vacuumized 20 seconds for the second time, be pressurized to normality rule 70mm pressurize 30 seconds, release.In 150 seconds total cycles of hot pressing, thickness 70m particieboard, MOR are 16kg/cm
2, plane tensile strength is that 0.4,2 hour thickness swelling rate is 6%.
The thick medium density fibre board (MDF) of example 2:19mm is executed urine aldehyde glue and is 12% composite material fiber, makes through φ 900 defibrators.Moisture content 12.5%, 170 ℃ of hot pressing temperatures, mating formation becomes to be of a size of the slab of 1000 * 1000 * 800mm.After sending into hot press, it is 400kg/cm that slab is pressurized to density
2The time, the one side spray is steamed, and steam pressure is 7kg/cm
2, one side vacuumized 20 seconds, after stopping, pressurizeing 10 seconds, and slab density is to 500kg/cm
2The time, the two sides is sprayed simultaneously and was steamed 20 seconds, and the two sides vacuumized 10 seconds again, was forced into normality rule back pressurize 10 seconds, 75 seconds total cycles of hot pressing, obtain the 19mm MDF, obtain 18mm finished product MDF behind the sanding 1mm, its density is 620kg/m
3, MOR is 26kg/cm
2, plane tensile strength is 6kg/cm
2, thickness swelling rate was 8% in 24 hours, content of free aldehyde is 20mg/100g.
Claims (8)
1. steam spraying-the vacuum hot pressing formation process of a wooden or non-composite wooden material, its feature can spray into quantitative steam from slab and make slab core reach 90～180 ℃ in 30 seconds in hot pressing in wooden or non-wooden material's slab.
2. in accordance with the method for claim 1, after in wooden or non-wooden material's slab, spraying into the steam certain time, utilize method for extracting vacuum to take out interior condensing water vapor of slab and the free aldehyde behind the adhesive solidification again.Its vacuum is 10
-3～10
-4Pa.
3. in accordance with the method for claim 1, slab must Fast Compression be could spray into steam in slab under 0.3～0.5 the condition to density, and the pressure that sprays into steam is also along with the different of the difference of slab material and density and at 4～16kg/cm
2Between change.
4. in accordance with the method for claim 1, hot pressing pressure steaming opportunity steams pressure with spray with spray, and certain cooperation rule is arranged the opportunity of vacuumizing, and when the pressurization of hot press hydraulic system stops, being spraying steam opportunity, during the hot press pressurization, is the opportunity of vacuumizing.Buckle line and the spray of different according to material and density and adhesive kind, adjustable heat steamed and the pumpdown time.
5. in accordance with the method for claim 1, have in the hot press of spray steaming system and vacuum system the temperature of heating platen and should remain and be higher than the temperature that steam is steamed in spray, the steam that is used to spray steaming can be saturated vapor or superheated steam.The medium that is used for the heat hot platen can be that steam or other have the body heat carrier.
6. in accordance with the method for claim 1, the mode of spray steaming-vacuum can be taken at the slab two sides according to the different mining of material material adhesive kind etc. and spray steaming simultaneously, vacuumize simultaneously then or one side spray steams simultaneously that one side vacuumizes or the spray of first single face is steamed, single face vacuumizes or steaming is sprayed on the two sides simultaneously then, the one side spray is steamed simultaneously and is vacuumized then, multiple modes such as two sides spray steaming more simultaneously again, two sides vacuumize simultaneously.
7. in accordance with the method for claim 1, wooden or non-composite wooden material comprises all wood-based plate kinds such as the fiberboard made with broadleaf, softwood, bamboo wood and agricultural wastes (is raw material as non-lignocellulose plant fibre materials such as bagasse, straw, wheat tangerine, wastes of flax), particieboard, glued board, laminated veneer lumber, fiber particle moulding goods.
8. in accordance with the method for claim 1, adhesive wooden or non-composite wooden material can be a pollopas, and melmac, phenolic resins, isocyanates, other thermosetting lignin are from rubber and other thermosetting resin and their mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001307282A CN1189293C (en) | 2000-10-12 | 2000-10-12 | Steam spraying and vacuum hot pressing formation process of wooden or non-wooden composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001307282A CN1189293C (en) | 2000-10-12 | 2000-10-12 | Steam spraying and vacuum hot pressing formation process of wooden or non-wooden composite material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1348851A true CN1348851A (en) | 2002-05-15 |
| CN1189293C CN1189293C (en) | 2005-02-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001307282A Expired - Fee Related CN1189293C (en) | 2000-10-12 | 2000-10-12 | Steam spraying and vacuum hot pressing formation process of wooden or non-wooden composite material |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100364740C (en) * | 2003-02-18 | 2008-01-30 | 韦尔豪泽公司 | A compressed composite product formation and transport method |
| CN104385429A (en) * | 2014-11-26 | 2015-03-04 | 武汉亿维登科技发展有限公司 | Vacuum heating spreading machine |
| CN104552544A (en) * | 2015-01-04 | 2015-04-29 | 唐忠荣 | Inserted injection pipe type steam injecting hot-pressing method and special device |
| CN106926325A (en) * | 2017-03-03 | 2017-07-07 | 西南林业大学 | A kind of apparatus and method of the pre- thermal acceleration thermosetting resin solidification of steam penetration |
| CN108818872A (en) * | 2018-05-24 | 2018-11-16 | 贵州益寿农业科技有限公司 | A method of utilizing Camellia Leaves making artificial plate |
| CN109591122A (en) * | 2017-12-29 | 2019-04-09 | 南京林业大学 | A kind of method of wood materials vacuum compression densification |
-
2000
- 2000-10-12 CN CNB001307282A patent/CN1189293C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100364740C (en) * | 2003-02-18 | 2008-01-30 | 韦尔豪泽公司 | A compressed composite product formation and transport method |
| CN104385429A (en) * | 2014-11-26 | 2015-03-04 | 武汉亿维登科技发展有限公司 | Vacuum heating spreading machine |
| CN104552544A (en) * | 2015-01-04 | 2015-04-29 | 唐忠荣 | Inserted injection pipe type steam injecting hot-pressing method and special device |
| CN106926325A (en) * | 2017-03-03 | 2017-07-07 | 西南林业大学 | A kind of apparatus and method of the pre- thermal acceleration thermosetting resin solidification of steam penetration |
| CN109591122A (en) * | 2017-12-29 | 2019-04-09 | 南京林业大学 | A kind of method of wood materials vacuum compression densification |
| CN109591122B (en) * | 2017-12-29 | 2021-09-03 | 南京林业大学 | Method for vacuum compression and densification of wood material |
| CN108818872A (en) * | 2018-05-24 | 2018-11-16 | 贵州益寿农业科技有限公司 | A method of utilizing Camellia Leaves making artificial plate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1189293C (en) | 2005-02-16 |
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