CN1044692C - Dry process for manufacture of non-adhesive hardboard - Google Patents
Dry process for manufacture of non-adhesive hardboard Download PDFInfo
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- CN1044692C CN1044692C CN94102560A CN94102560A CN1044692C CN 1044692 C CN1044692 C CN 1044692C CN 94102560 A CN94102560 A CN 94102560A CN 94102560 A CN94102560 A CN 94102560A CN 1044692 C CN1044692 C CN 1044692C
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Abstract
The present invention provides a dry method for the manufacture of a non-adhesive hard fiber board, which comprises the following steps: separating vegetable materials, drying the vegetable materials, forming the vegetable materials under the condition of not adding synthetic resin adhesive and pressing the vegetable materials into an artificial board by heat. The mechanical property of the non-adhesive hard fiber board reaches requirements higher than the requirements of a second rate object specified by a hard fiber board national standard, and the non-adhesive hard fiber board particularly has good water resistance. The dry method for the manufacture of a non-adhesive hard fiber board can be directly used for the existing dry method hard fiber board production line, and the dry method for the manufacture of a non-adhesive hard fiber board also provides an operable reference for the technological transformation of a wet method hard fiber board.
Description
The present invention is the manufacture method that a kind of dry method does not have the glue hardboard, belongs to the B27N class in International Classification of Patents.This method be with plant material through fiber separation, drying, do not applying the method that the condition compacted under of synthetic resin gum, hot pressing get a kind of artificial board, the alternative timber of its product is used for furniture, fields such as interior decoration, building, the vehicles, packing.
U.S.'s dry-process fiberboard that begins one's study the forties begins suitability for industrialized production the fifties.Aborning,, generally all to add a spot of synthetic resin gum for improving the intensity and the water proofing property of plate, however one of principal element that resin glue but is a board cost to rise.For without glue, and can guarantee the performance of sheet material, all carry out the research of non-glue fibre board in recent years both at home and abroad.35 volume (1985) 2 phases of U.S.'s forestry products magazine, published the research report of American scholar about " two kinds of different fibrous raw materials are made non-glue fibre board ", the raw material (wood chip) that wherein a kind of method is a fiber, will be under the 1.3MPa vapour pressure boiling 2 minutes and-2 minutes and 30 seconds, the acquisition average moisture content is 60% wet fiber behind defibrination, under 104 ℃ of temperature, be dried to constant weight (over dry state) then, the weak point of this method is: 1. increase energy consumption, also be difficult to reach over dry because of safety factor in actual production; 2. the sheet material water absorption rate of making is 60%, substantially exceeds standard-required.The no glue making sheet technology that Canada Shen Guo town doctor invents (Chinese patent application number 85105958.9 specifications P.1-5,9-10), a projecting point is that plant fiber material need carry out in good time high-pressure water vapor processing, make the hemicellulose degraded in the raw material components and be hydrolyzed into water-soluble substances, its hot water extract is approximately about 10-30%, the method is used for common dry-process fiberboard production line, also must be before defibrination tret high steam pre-processing device, could satisfy the requirement of no glue glued adhesion.China Zhongnan Forestry Inst. journal 10 volume (nineteen ninety) 1 phases have been delivered the test report about " no glue dry horminess fibreboard heat pressing process discussion " such as Jiang Yuanzhou, common dry horminess fibreboard two sections pressurizations commonly used are adopted in this test, draw the hot pressing temperature amount of being remarkable influence factor by orthogonal test, with 220 ℃ be best hot pressing temperature parameter, its weak point is: 1. hot pressing temperature height; 2. the sheet material water absorption rate is also higher, mostly surpasses 30%; 3. significantly the panel compacting is difficult, just as described herein, and being used for suitability for industrialized production also needs further research.
The objective of the invention is to avoid above-mentioned weak point of the prior art, but the production method that provides a kind of dry method of suitability for industrialized production not have the glue hardboard, and the quality of product can reach the hardboard request of national standard; Two of purpose of the present invention provides a kind of dry method that is directly used on the existing dry horminess fibreboard production line does not have glue hardboard production technology; Three of purpose of the present invention be for the process and technology innovation that soaks the method hardboard seek a kind of economy, feasible, do not have a method of contaminated wastewater again.
Production process of the present invention is:
A kind of manufacture method of dry method non-glue fibre board, main processes is: raw material timber is made wood chip, make hardboard through washing, boiling, fiber separation, drying, moulding, precompressed, transversal, hot pressing and saw limit processing step, it is characterized in that three sections pressurizations of the fashionable employing of slab hot compression molding, the heat pressing process condition is: high pressure 3.4-6.4Mpa, low pressure 0.5-2.0MPa; Hot pressing temperature 180-210 ℃; Hot pressing time: t
1(high-pressure closing) 10 seconds-90 seconds, t
2(exhaust) 30 seconds-240 seconds, t
a(mould and close) 30 seconds-240 seconds; Defibrator process vapour pressure during its fiber separation is 0.4-1.2MPa, with 0.4-0.7MPa for well; Time is 1 minute-15 minutes, is divided into 1 minute-6; The moisture content of dry back fiber is 4-12%, with 5-8% for well.
Except that not having " applying glue " operation, all the other are identical with existing dry horminess fibreboard production process, and device therefor is also identical.
The used plant material of the present invention mixes the fiber of seeds etc. for meaning poplar, birch, weedtree and factory, after washing under the 0.4-1.2MPa vapour pressure boiling and defibrination 1 minute-15 minutes, the paraffin that applies 0-2% simultaneously is as waterproofing agent.But fiber separation vapour steps down to 0.4-0.7MPa, the time weak point is timesharing in 1 minute-6, then can improve the fiber yield, reduces the hot water extract, helps improving plate face quality and resistance to water, and table 1 is the hot water extract and the pH value of two kinds of fibers.
Table 1 hot water extract and pH value
| Seeds | Hot water extract % | PH value |
| The meaning poplar | 3.46 | 5.31 |
| Birch | 4.62 | 4.66 |
The tabular hot water extract is far below the requirement of aforementioned Shen Guo town patent of invention.The present invention can not apply paraffin, but applies the paraffin of 0.5-1.5%, then can obviously reduce the water absorption rate of sheet material, thereby make sheet material have excellent water tolerance.After the fiber discharging, be that to be dried to moisture content under the 170-190 ℃ of condition be 4-12% in the drying medium temperature, with the moisture content during for 5-8% for well, both can shorten pressing cycle, can obtain plate property preferably again.Dried fiber carries out hot pressing after shop blank molding, precompressed, the saw limit gets product.Adopt three sections pressurizations when characteristics of the present invention are hot pressing, its heat pressing process condition is:
Pressure: high pressure 3.4-6.4MPa (existing wet pressed hardboard press, general pressure is 5-5.4MPa)
Low pressure 0.5-2.0MPa
Temperature: 180-210 ℃
Time: t
1(high-pressure closing) 10 seconds-90 seconds
t
2(steam discharge) 30 seconds-240 seconds
t
3(mould and close) 30 seconds-240 seconds heat pressing process are that dry method does not have the key that the glue hardboard is made, adopt process conditions of the present invention, do not apply any synthetic tree and refer to glue, the dry method that makes does not have the desired value of the physical and mechanical property of glue hardboard above hardboard national standard seconds.
Adopt low temperature boiling technology and the hot pressing pressure that is lower than common dry horminess fibreboard, to make slurrying and leading portion equipment thereof in the existing wet method hard fibre production line, loader and back segment equipment thereof, do not have and all can utilize when the glue hardboard is produced changing dry method into, reduced the input of technical cost.
The present invention does further narration in conjunction with the embodiments
Embodiment 1:
It is raw material that the present invention adopts meaning poplar, birch and different factories string, and aforementioned process conditions have been carried out multiple authentication, will verify that now the situation example is in table 2:
| Raw material | Digesting technoloy | Applying wax amount (%) | Fiber moisture (%) | Heat pressing process | The physical and mechanical property of plate | |||||
| Vapour pressure (MPa) | Time (min) | Temperature (℃) | Pressure (MPa) | Time (min) | Density (g/cm 3) | MOR (MPa) | Water absorption rate (%) | |||
| The meaning poplar | 0.4-0.6 | 3.0 | 1.2 | 6 | 200 | 5.4-1.5-5.4 | 0.5-1.5-1.5 | 1.14 | 52.1 | 19.8 |
| The meaning poplar | 0.4-0.6 | 3.0 | 1.2 | 6 | 200 | 5.4-1.4-5.4 | 0.5-1.25-1.25 | 1.06 | 52.3 | 19.5 |
| The meaning poplar | 0.4-0.6 | 3.0 | 1.2 | 6 | 210 | 5.4-1.5-5.4 | 0.5-1.5-1.5 | 1.07 | 52.5 | 23.7 |
| The meaning poplar | 0.4-0.6 | 3.0 | 1.2 | 6 | 210 | 5.4-1.4-5.4 | 0.5-1.0-1.0 | 1.08 | 59.2 | 17.4 |
| The meaning poplar | 0.4-0.6 | 3.0 | 1.2 | 6 | 180 | 5.4-1.5-5.4 | 0.5-1.5-1.5 | 1.05 | 37.7 | 22.7 |
| Birch | 0.4-0.5 | 5 | 1.0 | 6.4 | 205 | 5.5-1.0-5.5 | 0.75-1.75-2.0 | 1.12 | 39.5 | 22.3 |
| Birch | 0.4-0.5 | 5 | 1.0 | 6.0 | 210 | 5.5-1.0-5.5 | 0.75-1.75-2.0 | 1.10 | 43.1 | 16.3 |
| Birch | 0.4-0.5 | 5 | 1.0 | 6.3 | 200 | 4.8-1.0-4.8 | 0.75-1.75-2.0 | 1.08 | 48.1 | 21.8 |
| Factory's fiber (I) | - | - | 1.0 | 6.6 | 200 | 5.4-1.4-5.4 | 0.75-1.75-1.5 | 1.13 | 52.5 | 24 |
| - | - | 1.0 1.0 | 6.6 6.6 | 210 180 | 5.4-1.3-5.4 5.4-1.5-5.4 | 0.75-1.75-1.5 0.67-1.75-1.25 | 1.14 1.07 | 43.3 36.8 | 23.4 33.3 | |
| Factory's fine male (II) | - | - | - | 6.5 | 200 | 5.4-1.7-5.4 | 0.75-1.5-1.5 | 1.12 | 37.8 | 27.0 |
| - | - | - | 6.5 | 210 | 5.4-1.7-6.4 | 0.75-1.5-1.5 | 1.16 | 36.4 | 23.0 | |
| National standard (hardboard) (GB12626.2-90) | Primes | ＞0.8 | ≥38.0 | ≤20.0 | ||||||
| Seconds | ≥29.0 | ＜30.0 | ||||||||
Embodiment 2:
The present invention has carried out the pilot production of an order of classes or grades at school on the dry-process fiberboard production line of timber company fibre-board plant, Zhuzhou City, pressing plate is 277 altogether, and specification is 2440 * 1220 * (3-8) mm.Production technology behind fiber drying, add after applying wax, the precompressed transversal, other processes are identical with the aforementioned technical process of the present invention.Raw material is a kind of to be meaning poplar, a kind of compound that adds a small amount of masson pine for the meaning poplar.The back wood chip moisture content of chipping is 50%, is 58% after the washing.With the continuous steamer boiling wood chip of total length 5m, vapour pressure is 0.6-0.65MPa, time 2 minutes.Because not applying glue, moisture participates in the no sizing material, so drying process is different with general dry method, and generally the medium inlet temperature of dry horminess fibreboard is 170-175 ℃, need the two-stage drying just can reach required moisture content.The medium inlet temperature is 120-125 ℃ during the dry meaning of the present invention poplar fiber, and the whole moisture content of one-level dried fibres reaches 5-6%, when dry meaning, loose compound, and 154 ℃ of medium inlet temperatures, the whole moisture content of one-level dried fibres reaches 6.8%.Applying wax amount 1.5%.The press number of plies is 10 layers, and during hot pressing temperature 195-203 ℃, it is 5.4MPa (consistent with existing wet method press pressure) that maximum pressure has 39 cars, and 1 car is 6.3MPa (common dry method pressure 6.9-7.8MPa); Hot pressing time: meaning poplar plate 3 minutes 30 seconds-6 minutes, poplar, deals 2 minutes 30 seconds-3 minutes 45 seconds shorten time 1/2-1/3 than wet production.
In 277 plates of whole 40 car meters, randomly draw 16 cars totally 18 plates, carry out the physical and mechanical property test, meet the last 83% that account for of hardboard national standard spy, I and II plate index, concrete heat pressing process condition and performance exemplify as table 3
Table 3 pilot production hot pressing condition and product physical and mechanical property
| License number | Seeds | The heat pressing process condition | Thickness of slab (mm) | Physical and mechanical property | ||||
| Temperature (℃) | Pressure (MPa) | Time (min) | Density (g/cM 2) | MOR (MPa) | Water absorption rate (%) | |||
| 11 | The meaning poplar | 200 | 5.4-1.5-5.4 | 0.75-1.25-1.5 (3.5) | 5.7 | 1.05 | 33.6 | 18.8 |
| 13 | The meaning poplar | 200 | 5.4-1.5-5.4 | 1.0-2.5-2.5 (B) | 5.8 | 0.87 | 45.4 | 18.6 |
| 18 22 | Yang Song Yang Song | 198 203 | 5.4-1.5-5.4 5.4-1.5-5.4 | 0.5-1.0-1.0 (2.5) 0.75-1.25-1.5 (3.5) | 4.0 4.0 | 1.01 0.94 | 58.5 39.4 | 13.1 13.5 |
| 30-2 | Yang Song | 158 | 5.4-1.5-5.4 | 0.5-1.5-1.0 (3.0) | 3.2 | 1.05 | 52.2 | 18.1 |
| 14 | The meaning poplar | 202 | 6.3-1.5-6.3 | 0.75-2.5-2.25 (5.5) | 5.5 | 1.05 | 37.3 | 12.1 |
Embodiment 3
The present invention has also carried out not adding the test of paraffin, and its main technique condition and sheet material physical and mechanical property see Table 4
Process conditions when table 4. does not add paraffin and sheet material physical and mechanical property
| Seeds | Conditions of cooking | Fiber moisture (%) | The heat pressing process condition | Physical and mechanical property | |||||
| Pressure (HPa) | Time (min) | Temperature (℃) | Pressure (MPa) | Time (min) | Density (g/cm 2) | MOR (MPa) | Water absorption rate (%) | ||
| Birch | 0.4-0.5 | 5 | 7.1 | 210 | 5.4-1.0-5.4 | 0.5-1.5-2.0 | 1.12 | 41.9 | 27.9 |
| Birch | 0.4-0.5 | 5 | 7.1 | 210 | 5.4-1.0-5.4 | 0.75-2-2.5 | 1.13 | 42.4 | 23.2 |
Add paraffin by finding out in the table that the sheet material water absorption rate that do not add paraffin will be higher than, but still meet the seconds requirement of hardboard national Specification.
The present invention compared with prior art has the following advantages:
1, the glue-free hardboard of dry method of producing with the present invention has good resistance to water, and its water absorption rate is starkly lower than general hardboard.
2, because not applying glue, adopt the one-level drying can reach required fiber moisture requirement, but therefore energy savings, and simplify drying device.
3, can make the manufacture of the glue-free hardboard of dry method.
4, existing dry horminess fibreboard production line adopts the present invention without any transformation, just can the glue-free hardboard of directly production dry method.
5, provide foundation for the technological transformation of wet method hard fibre, in existing wet-process fiber board is produced, only need to increase drying, moulding, pre-press equipment, can transform dry method non-glue fibre board production line as, thereby produce the product of pleasing both parties that the back side does not have wire mark, and can shorten pressing cycle than wet production, raise labour productivity, particularly but saving water resource is eliminated the contaminated wastewater in the wet production, makes the production of wet pressed hardboard obtain newborn.
6, one ton of dry horminess fibreboard, the applied amount of phenolic resin glue is about 3%, without gluing method, can reduce production costs about 1/3 with of the present invention, and by present price, plate per ton can be saved about 300 yuan of sizing material expenses.
Claims (4)
1, a kind of manufacture method of dry method non-glue fibre board, main processes is: raw material timber is made wood chip, make hardboard through washing, boiling, fiber separation, drying, moulding, precompressed, transversal, hot pressing and saw limit processing step, it is characterized in that three sections pressurizations of the fashionable employing of slab hot compression molding, the heat pressing process condition is: high pressure 3.4-6.4MPa, low pressure 0.5-2.0MPa; Hot pressing temperature 180-210 ℃; Hot pressing time: t
1(high-pressure closing) 10 seconds-90 seconds, t
2(exhaust) 30 seconds-240 seconds, t
3(mould and close) 30 seconds-240 seconds; Defibrator process vapour pressure during its fiber separation is 0.4-1.2MPa, with 0.4-0.7MPa for well; Time is 1 minute-15 minutes, is divided into 1 minute-6; The moisture content of dry back fiber is 4-12%, with 5-8% for well.
2, manufacture method according to claim 1 is characterized in that applying paraffin in defibrator process or when dry, and the applying wax amount is 0-2%, with 0.5-15% for well.
3, manufacture method according to claim 1 is characterized in that the preferred value of heat pressing process condition is: high pressure 5-5.4MPa, low pressure 1.3-1.7MPa, temperature 195-205 ℃.
4, manufacture method according to claim 1 is characterized in that raw material is each plant fiber raw material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94102560A CN1044692C (en) | 1994-03-22 | 1994-03-22 | Dry process for manufacture of non-adhesive hardboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94102560A CN1044692C (en) | 1994-03-22 | 1994-03-22 | Dry process for manufacture of non-adhesive hardboard |
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|---|---|
| CN1108988A CN1108988A (en) | 1995-09-27 |
| CN1044692C true CN1044692C (en) | 1999-08-18 |
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| CN94102560A Expired - Fee Related CN1044692C (en) | 1994-03-22 | 1994-03-22 | Dry process for manufacture of non-adhesive hardboard |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1332793C (en) * | 2005-01-07 | 2007-08-22 | 浙江林学院 | Method for manufacturing glue-less fiber board by leak-free type hot pressing technology |
| CN101158136B (en) * | 2007-09-12 | 2011-11-23 | 彭万喜 | Method for manufacturing lightweight acoustic insulation shock-proof wood-based panel by employing waste papers |
| CN102490240A (en) * | 2011-12-09 | 2012-06-13 | 谢力生 | Fiberboard manufacturing method |
| CN102528890B (en) * | 2011-12-12 | 2014-02-19 | 宁波大世界家具研发有限公司 | Manufacturing method for non-adhesive wood fiber part |
| CN103707381A (en) * | 2014-01-10 | 2014-04-09 | 宁波大世界家具研发有限公司 | Method for manufacturing non-glued bamboo fiber board |
| CN103722604A (en) * | 2014-01-10 | 2014-04-16 | 宁波大世界家具研发有限公司 | Method for manufacturing bamboo fiber non-glued door plank |
| CN104385390B (en) * | 2014-11-12 | 2016-09-07 | 广西南宁绿园北林木业有限公司 | The method using lignin adhesive production density plate |
| CN106671243A (en) * | 2017-01-05 | 2017-05-17 | 王从容 | Production method of ultrathin veneering straw fiberboard |
| CN107756587B (en) * | 2017-09-07 | 2022-11-08 | 南京林业大学 | Method and equipment for manufacturing glue-free water-resistant fiberboard |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85105958A (en) * | 1985-08-06 | 1987-02-25 | 沈国镇 | Produce the method for synthetic by lignocellulosic materials |
| CN1067399A (en) * | 1991-06-05 | 1992-12-30 | 蛇口招商无胶人造板新技术有限公司 | Lignocellulosic materials is made glue-free artificial board's commercial run and equipment |
| RU2005596C1 (en) * | 1992-07-02 | 1994-01-15 | Зелинский Сергей Владимирович | Method for manufacture of wallboards with no binding agent and production lines for its realization |
-
1994
- 1994-03-22 CN CN94102560A patent/CN1044692C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85105958A (en) * | 1985-08-06 | 1987-02-25 | 沈国镇 | Produce the method for synthetic by lignocellulosic materials |
| CN1067399A (en) * | 1991-06-05 | 1992-12-30 | 蛇口招商无胶人造板新技术有限公司 | Lignocellulosic materials is made glue-free artificial board's commercial run and equipment |
| RU2005596C1 (en) * | 1992-07-02 | 1994-01-15 | Зелинский Сергей Владимирович | Method for manufacture of wallboards with no binding agent and production lines for its realization |
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| CN1108988A (en) | 1995-09-27 |
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