CN101307240A - Decatizing and charring process of cotton wood - Google Patents

Decatizing and charring process of cotton wood Download PDF

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Publication number
CN101307240A
CN101307240A CNA2008101233713A CN200810123371A CN101307240A CN 101307240 A CN101307240 A CN 101307240A CN A2008101233713 A CNA2008101233713 A CN A2008101233713A CN 200810123371 A CN200810123371 A CN 200810123371A CN 101307240 A CN101307240 A CN 101307240A
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CN
China
Prior art keywords
poplar
cottonwood
veneer
decatize
controlled
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2008101233713A
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Chinese (zh)
Inventor
罗真付
孙启祥
吴智慧
潘彪
周金星
王丽
冷魏祺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Six Dynasties Timber Industry Research Institute
Nanjing Forestry University
Original Assignee
Nanjing Six Dynasties Timber Industry Research Institute
Nanjing Forestry University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanjing Six Dynasties Timber Industry Research Institute, Nanjing Forestry University filed Critical Nanjing Six Dynasties Timber Industry Research Institute
Priority to CNA2008101233713A priority Critical patent/CN101307240A/en
Publication of CN101307240A publication Critical patent/CN101307240A/en
Pending legal-status Critical Current

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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/10Biofuels, e.g. bio-diesel

Abstract

The invention discloses a method for steaming and charing of cottonwood. The method is characterized in that in a closed hot pressing system, high-pressure steam with the temperature more than 130 DEG C is used to make the refrigerating treatment to the cottonwood or single plates, and according to different initial moisture contents of the single plates, the pressure of the steam is controlled between 0.3 and 0.5MPa, and the steaming time is controlled within 3 hours; treated single plates are hot-pressed into multilayer veneers which are sawed into standard plates, the standard plates are put in a temperature humidity chamber for balancing, and the cottonwood after steaming and charing is obtained. The cottonwood treated by the method of the invention has the advantages of improving indexes such as dimensional stability and rotproofness, etc., making wood color deep, saturated, uniform and more beautiful, improving the decorative function of the cottonwood, widening the application of the cottonwood and breaking a new market for the high-end application of the cottonwood.

Description

The decatize charing method of poplar
Technical field
The present invention relates to wood carbonization method, relate to the decatize charing method of poplar specifically.
Background technology
Poplar is a kind of fast-growing tree species, has characteristics such as wide adaptability, year vegetative period length, fast growth.Along with willow cultivate and the progress of processing technology and market to the increase of industrial cut stock amount, the purposes of China's artificial forest poplar constantly enlarges, and has become the main raw material of China's wood-based panel industry.Whole change degree of board using poplar board is very high, need not splice substantially, and the repairing amount seldom.The small dimension wood of willow, the tip of a branch, branch and industrial wood waste are the desirable feedstock of producing shaving board and medium density fibre board (MDF).Because the density of artificial forest poplar is lower, wood color is shallow, handling ease, product that can production density is low, mechanical property meets the demands, the plate complexion is shallow, visual appearance is good.
But because aspen fibers by using silicon short texture, water ratio height and skewness are many reaction woods, easily produce dry-shrinkage deformed and manufacturing deficiency such as Veneer Cutting fluffing, had a strong impact on the efficient utilization of poplar.In addition, because it is improper to cultivate sfgd., the artificial forest poplar has material defectives such as form irregularity, knot are many, evil mind, small holes caused by worms more.To be mainly used in performance requriements not high for poplar a long time ago, the packing that added value of product is low, grange building materials, match, throwaway chopsticks and Wood-based Panel Production etc.Poplar is mainly as solid wooden compound floor central layer or base plate, short-cycle industrial material material or road, river course green tree species etc. at present.Be mainly used in abroad and make thick glued board and oriented wood chipboard.For making full use of the poplar resource, improve the grade of material inferior, alleviate the imbalance between supply and demand of timber, solve that the poplar material is soft, intensity is low and problem such as poor dimensional stability, press for the exploitation and efficient utilization that add quick living poplar.
Summary of the invention
In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a kind of decatize charing method of poplar, poplar is carried out effective modification handle to improve its character, enlarge its use range.
The present invention is achieved through the following technical solutions: a kind of decatize charing method of poplar, it is characterized in that in airtight hot-pressing system, with the high pressure steam more than 130 ℃ poplar or veneer are separated thermal treatment for a long time, high temperature makes the timber composition, particularly cell wall substance decomposes, thereby part is again in conjunction with wood internal stress being relaxed or removing, the hemicellulose degraded forms intermediate in the timber, reduced the quantity of free hydroxyl group, reduced the water absorbability of timber, made timber produce hydrophobization, cellulosic crystal structure changes, degree of crystallinity improves, and has improved the stability of timber.
The invention has the beneficial effects as follows: the present invention has improved the dimensional stability and the rotproofness of poplar, and bending strength, surface hardness and wear-resistant degree obviously do not descend raising poplar Products Quality and commercial value, the efficient utilization of realization poplar.After poplar was handled through decatize, wood color deepens saturated, and was more evenly attractive in appearance, improved the decoration functions of poplar, enlarged its purposes, for the high-end applications of poplar has been opened up new market.
Embodiment
To describe the specific embodiment of the present invention in detail below:
Embodiment 1
The poplar veneer of will anticipating after being dried to water ratio and being 14%, places pressure-pot to carry out gas and steams charing, and pressure is 0.5Mpa, and the time is 15min, the veneer after handling is hot pressed into multiplying plywood through thermocompressor, pressure: 22Mpa; Time: 30min; Temperature: 105 degree, used glue is phenolic resin modified urea-formaldehyde glue, water-tolerant, bonding strength height.Veneer saw is made stock board, put into climatic chamber then and carry out balance, temperature is 20 ℃, relative humidity is 65%, weight difference in adjacent 2 hours is no more than till 0.1%, with the intensity of the corresponding test specimen of omnipotent mechanical test machine testing, survey width, the thickness of correlation time with vernier callipers and spiral micrometer.Continuation will be surveyed width then, the thickness test specimen is put into climatic chamber, 20 ℃ of temperature, relative humidity is 35%, be no more than till 0.1% up to the adjacent weight difference that recorded in 2 hours, detect specimen width, thickness in the climatic chamber, calculating anti-breathing rate (ASE) is 72.33%, and bending strength is 38.55MPa, and Young's modulus is 7131.94MPa.
Embodiment 2
The poplar veneer of will anticipating, being dried to water ratio is 11%, places pressure-pot to carry out gas veneer and steams charing, and pressure is 0.3Mpa, and the time is 30min, the veneer after handling is hot pressed into multiplying plywood through thermocompressor, pressure: 22Mpa; Time: 30min; Temperature: 105 degree, used glue is phenolic resin modified urea-formaldehyde glue, water-tolerant, bonding strength height.Veneer saw is made stock board, put into climatic chamber then and carry out balance, temperature is 20 ℃, relative humidity is 65%, weight difference in adjacent 2 hours is no more than till 0.1%, with the intensity of the corresponding test specimen of omnipotent mechanical test machine testing, survey width, the thickness of correlation time with vernier callipers and spiral micrometer.Continuation will be surveyed width then, the thickness test specimen is put into climatic chamber, 20 ℃ of temperature, and relative humidity is 35%, be no more than till 0.1% up to the adjacent weight difference that recorded in 2 hours, calculating anti-breathing rate (ASE) is 14.04%, and bending strength is 38.413MPa, and Young's modulus is 3730.463MPa.
Embodiment 3
The poplar veneer of will anticipating, being dried to water ratio is 17%, places pressure-pot to carry out gas veneer and steams charing, and pressure is 0.5Mpa, and the time is 45min, the veneer after handling is hot pressed into multiplying plywood through thermocompressor, pressure: 22Mpa; Time: 30min; Temperature: 105 degree, used glue is phenolic resin modified urea-formaldehyde glue, water-tolerant, bonding strength height.Veneer saw is made stock board, put into climatic chamber then and carry out balance, temperature is 20 ℃, relative humidity is 65%, weight difference in adjacent 2 hours is no more than till 0.1%, with the intensity of the corresponding test specimen of omnipotent mechanical test machine testing, survey width, the thickness of correlation time with vernier callipers and spiral micrometer.Continuation will be surveyed width then, the thickness test specimen is put into climatic chamber, 20 ℃ of temperature, relative humidity is 35%, be no more than till 0.1% up to the adjacent weight difference that recorded in 2 hours, after testing, its anti-breathing rate (ASE) is 42.48%, and bending strength is 43.537MPa, and Young's modulus is 5193.82MPa.
Compare with plain plate through the poplar after the decatize processing, not only wood color deepens saturated, more even, more attractive in appearance, the decorative value and the economic worth of poplar have been improved, further enlarge the purposes of poplar, can be used as building board (as wallboard, roofing board, eaves board, doorframe, window frame, lines, solid wooden compound floor base material etc.), traffic transporting facility (car, ship inner trim panels) etc.
Below disclose the present invention with preferred embodiment, so it is not in order to restriction the present invention, and all employings are equal to replaces or technical scheme that the equivalent transformation mode is obtained, all drops within protection scope of the present invention.

Claims (2)

1, the decatize charing method of poplar, it is characterized in that: in airtight hot-pressing system, with the high pressure steam more than 130 ℃ poplar or veneer are separated thermal treatment, the pressure of steam is controlled at 0.3-0.5Mpa according to the initial aqueous rate difference of veneer, the time of decatize was controlled in 3 hours, high temperature makes the timber composition that complicated chemical transformation take place, veneer after handling is hot pressed into multiplying plywood through thermocompressor, the multilayer gluing bladed saw is made standard plate, put into climatic chamber then and carry out balance, temperature is 20 ℃, and relative humidity is respectively 65% and 35%, weight difference in adjacent 2 hours is no more than till 0.1%, surveys its anti-breathing rate.
2, the decatize charing method of poplar according to claim 1, it is characterized in that high temperature decomposes the cell wall substance of timber composition, part combination again, the hemicellulose degraded forms intermediate in the timber, reduced the quantity of free hydroxyl group, cellulosic crystal structure changes, and degree of crystallinity improves.
CNA2008101233713A 2008-06-16 2008-06-16 Decatizing and charring process of cotton wood Pending CN101307240A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2008101233713A CN101307240A (en) 2008-06-16 2008-06-16 Decatizing and charring process of cotton wood

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2008101233713A CN101307240A (en) 2008-06-16 2008-06-16 Decatizing and charring process of cotton wood

Publications (1)

Publication Number Publication Date
CN101307240A true CN101307240A (en) 2008-11-19

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CNA2008101233713A Pending CN101307240A (en) 2008-06-16 2008-06-16 Decatizing and charring process of cotton wood

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102837347A (en) * 2012-09-24 2012-12-26 中南林业科技大学 Poplar structural engineering material and manufacture method thereof
CN102839790A (en) * 2012-08-31 2012-12-26 绍兴市高盛农业开发有限公司 Multifunctional wood roof window frame material
CN105291533A (en) * 2014-06-25 2016-02-03 张双保 Heat-treated E.grandis x E.urophylla/polyethylene-film composite material
CN106313250A (en) * 2016-10-18 2017-01-11 南京林业大学 Method for medium-high-temperature mild carbonization and thermal modification of broad-leaved wood for solid wood product
CN107363922A (en) * 2017-06-29 2017-11-21 广西防城港市昌海木业有限公司 A kind of technique of glued board slab hot pressing
CN110142831A (en) * 2015-11-18 2019-08-20 瑞士克罗诺泰克股份公司 OSB(orientation texture particieboard with improved characteristic) wood-based plate and for its manufacture method
CN115179382A (en) * 2022-06-15 2022-10-14 江西诺文斯家具有限公司 Moisture-proof furniture and manufacturing process thereof

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102839790A (en) * 2012-08-31 2012-12-26 绍兴市高盛农业开发有限公司 Multifunctional wood roof window frame material
CN102837347A (en) * 2012-09-24 2012-12-26 中南林业科技大学 Poplar structural engineering material and manufacture method thereof
CN102837347B (en) * 2012-09-24 2015-05-27 中南林业科技大学 Poplar structural engineering material and manufacture method thereof
CN105291533A (en) * 2014-06-25 2016-02-03 张双保 Heat-treated E.grandis x E.urophylla/polyethylene-film composite material
CN110142831A (en) * 2015-11-18 2019-08-20 瑞士克罗诺泰克股份公司 OSB(orientation texture particieboard with improved characteristic) wood-based plate and for its manufacture method
CN110142831B (en) * 2015-11-18 2021-08-20 瑞士克罗诺泰克股份公司 OSB (oriented strand Board) artificial board having improved characteristics and method for manufacturing the same
CN106313250A (en) * 2016-10-18 2017-01-11 南京林业大学 Method for medium-high-temperature mild carbonization and thermal modification of broad-leaved wood for solid wood product
CN107363922A (en) * 2017-06-29 2017-11-21 广西防城港市昌海木业有限公司 A kind of technique of glued board slab hot pressing
CN115179382A (en) * 2022-06-15 2022-10-14 江西诺文斯家具有限公司 Moisture-proof furniture and manufacturing process thereof

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Application publication date: 20081119