CN102561079B - Sulfate pulping method for compressed bamboo chips - Google Patents
Sulfate pulping method for compressed bamboo chips Download PDFInfo
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- CN102561079B CN102561079B CN201110442216.XA CN201110442216A CN102561079B CN 102561079 B CN102561079 B CN 102561079B CN 201110442216 A CN201110442216 A CN 201110442216A CN 102561079 B CN102561079 B CN 102561079B
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Abstract
The invention discloses a method for compressing papermaking bamboo chips into square blocks facilitating transportation and then implementing sulfate pulping, and relates to a drying and compression method for bamboo chips and a sulfate pulping technology for the compressed bamboo chips. The bamboo chips are compressed into high-density cubes by a mechanical method, so that the problems of small volume weight, low transport efficiency, large storage space and the like of bulk bamboo chips are solved; and a specific sulfate pulping process scheme is provided for the compressed bamboo chips, so that the pulp forming quality of the compressed bamboo chips is ensured. The volume of the compressed bamboo chips is reduced to below 1/3 of the volume of the naturally stacked non-compressed bamboo chips; under the same sulfate digestion process condition, the sieve residue rate of the formed pulp is reduced by 20 to 40 percent; and when the bamboo chips are beaten to the same beating degree, the beating time is shortened by 15 to 30 percent, and the beating energy consumption can be obviously reduced.
Description
Technical field
The invention belongs to pulping and paper-making field, is a kind ofly paper grade (stock) bamboo chip is compressed into the square of being convenient to transport then carries out the method for sulfate pulping, relates to the sulfate pulping technique of the oven dry of bamboo chip and compression method, compressed bamboo chips.
Background technology
Along with develop rapidly and the country reinforcement to natural forest protection of resources dynamics of China's pulping and paper-making industry, the sufficient supplies that how to meet paper making raw material has become the strategic problem that concerns China's enterprises in pulp and paper industry living or death.Bamboo is exactly a kind of important pulping and paper-making raw material since ancient times, and on the south China the Changjiang river, the regional reserves such as each province and South Asia, South Asian Subcontinent are huge.But because the above-mentioned bamboo place of production mostly is mountain area or the network of waterways in length and breadth, add that the natural packing density of bamboo chip is less, therefore bamboo chip transport becomes again a poor efficiency, expensive process.The efficiency, the reduction raw material cost of transportation that how to improve bamboo chip transport are the difficult problems that enterprises in pulp and paper industry is anxious for solution.
Although bamboo has higher density in natural plants, but it is as a kind of plant tissue, during through powerful mechanical compress, will inevitably sustain damage, thereby its Paper Pulp is produced to certain influence, how negative effect is down to minimum, ensureing that enterprises in pulp and paper industry produces qualified slurry paper product, is also the key point that can compressed bamboo chips obtain industry accreditation.
The object of the invention is to solve the difficult problems such as bamboo chip unit weight in bulk is little, conevying efficiency is low, memory space is large, the bamboo chip through mechanical compress is proposed to sulfate pulping process program targetedly simultaneously, ensures the pulp quality of compressed bamboo chips.
Summary of the invention
After bamboo is chipped, drying, compression make it become the high density cuboid of regular shape from loose low unit weight state, then carry out slurrying with sulfate process, and specific embodiments is as follows:
(1) get the raw materials ready: by the bamboo chip of bamboo chipping machine cutting growth 15～30mm, wide 20～30mm size, screen out disintegrating slag and silt wherein;
(2) dry: bamboo chip is dried to 20～40min with rotary drying kiln or mesh-belt drier at 70～230 DEG C, to bamboo chip moisture content be 10～20%;
(3) compression: by dry after bamboo chip with full-automatic extruder at 400～1000kg/cm
2pressure lower compression grow into 150-340mm, wide be 75-340mm, the high cuboid for 60-140mm;
(4) boiling: adopt sulfate process to carry out boiling to compressed bamboo chips, total alkali consumption 15～22% (is equivalent to the percentage of over dry raw material weight, in NaOH, lower same), sulphidity 15～30%, liquor ratio 1: 6～1: 2.5,150～175 DEG C of maximum temperatures, heating-up time 120～250min, temperature retention time 80～180min;
(5) making beating: the sulfate pulp to compressed bamboo chips is pulled an oar, and beating consistency, lower cutter weight are to reduce fibre cutting as principle as far as possible.
Compared with traditional bamboo chip sulfate pulping technique, feature of the present invention is:
(1) bamboo chip is after drying and compressing, when volume reduces to natural packing 1/3～1/4, can significantly dwindle transport and memory space, raising conevying efficiency, reduce cost of transportation, and the block-shaped rule of compressed bamboo, easily pile up and pile up, also can improve the operating efficiency of short-haul operation.
(2) bamboo chip is completely compressing by enough mechanisms, does not add any adhesive, and natural environment is not increased to any pollution, and bamboo piece can expand and scatter at once after meeting water, without increasing the relevant equipment that cracks.
(3) bamboo chip is after mechanical presses, and original physical arrangement is subject to destruction to a certain extent, for the infiltration of digestion process herb liquid provides advantage, boiling screening reject rate is obviously reduced, and this is by the boiling of the bamboo material of going a long way greatly.Based on same reason, under the prerequisite that reaches identical pulping hardness number, the comparable not compressed bamboo chips of boiling of compressed bamboo chips is saved a certain amount of chemicals, can reduce like this pollutional load of slurrying cost and pulping waste liquor.
(4) because original cell membrane interlayer structure after absorbing mechanical energy is damaged, the sulfate pulp of compressed bamboo chips is done the used time and can be realized that cell membrane is outer field to be abolished and the wire-dividing broom purification of internal layer being subject to less making beating, beating time obviously shortens, and is very beneficial for the reduction of beating energy consumption.
(5) sulfate pulping taking compressed bamboo piece as raw material, only need to finely tune pulping chemical consumption and beating process parameter, without changing production equipment and technological process, can not bring investment risk for enterprises in pulp and paper industry
Brief description of the drawings
Fig. 1 is bamboo chip compression pulping process flow of the present invention, and Fig. 2 is traditional bamboo chip pulping process flow.
Embodiment
To represent that respectively the sinocalamus latiflorus of thin wall bamboo wood and heavy wall class bamboo wood and mao bamboon are as raw material, to compressed bamboo chips and not the sulfate pulping performance of compressed bamboo chips contrast, for the present invention does more specific description:
Embodiment 1
The process conditions that sinocalamus latiflorus bamboo chip is dried, compressed: get sinocalamus latiflorus bamboo chip, at 105 DEG C, dry to moisture content be 15%, then at 500kg/cm
2pressure under sinocalamus latiflorus bamboo chip is compressed into the cuboid of 15cm × 7.5cm × 6cm.
Pressure contracting and unpressed sinocalamus latiflorus bamboo chip 2kg (over dry) carry out sulfate pulping with following process conditions respectively: total alkali 16%, sulphidity 25%, solid-to-liquid ratio 1: 4,170 ° of maximum temperatures, heating-up time 120min, temperature retention time 120min, screening sieve seam 0.35mm.
Pulping adopts the making beating of Valley beater, beating consistency 1.7%, and 45 ± 2 ° of SR of target beating degree, use Germany to produce the Rapid-Kothen page device of embarking on journey and copy handsheet processed, quantitatively 60g/m after making beating
2, 97 DEG C of bake out temperatures, sheet pulp performance all detects according to paper industry standard method.
Under identical conditions of cooking, the pulpability contrast of compressed bamboo chips and not compressed bamboo chips is as shown in table 1.
Table 1
From table 1, bamboo chip after drying and compressing, 0.28 air dried tonne/m that transport unit weight can be when not compressing
3be increased to 0.93 air dried tonne/m
3, transportation volume has reduced 70%; Under identical kraft cooking process conditions, the pulping screening reject rate of compressed bamboo chips is than not compressed bamboo chips minimizing 27%, and permanganate number declines 2.1, and whiteness improves 2.35 units, becomes pulp yield loss very little; While pulling an oar equally to 45 ± 2 ° of SR, the beating time of compressed bamboo chips sulfate pulp is than not compressed bamboo chips shortening 24%, and sheet pulp performance is without marked change simultaneously.
Embodiment 2
The process conditions that bamboo chip to mao bamboon is dried, compressed: get mao bamboon bamboo chip, at 120 DEG C, dry to moisture content be 10%, then at 600kg/cm
2pressure press down the cuboid that shortens 15cm × 7.5cm × 6cm into.
The bamboo chip 2kg (over dry) of pressure contracting and uncompressed carries out sulfate pulping with condition below respectively; Total alkali 18%, sulphidity 25%, solid-to-liquid ratio 1: 5,170 ° of maximum temperatures, heating-up time 110min, temperature retention time 100min, screening, sieve seam 0.35mm.
Pulping adopts the making beating of Valley beater, and 45 ± 2 ° of SR of beating degree use Germany to produce the Rapid-Kothen page device of embarking on journey and copy handsheet processed, quantitatively 60g/m
2, 97 DEG C of bake out temperatures, sheet pulp performance all detects according to paper industry standard method.
Experimental result is as shown in table 2.
From table 2, bamboo chip is after drying and compressing, and transport unit weight is by original 0.25 air dried tonne/m
3below bring up to 0.94 air dried tonne/m
3, transportation volume has reduced 73%; Under identical kraft cooking process conditions, the pulping screening reject rate of compressed bamboo chips is than not compressed bamboo chips minimizing 36%, and permanganate number declines 1.2, and whiteness improves 1.32 units, becomes pulp yield loss less; While pulling an oar equally to 45 ± 2 ° of SR, the beating time of compressed bamboo chips sulfate pulp is than not compressed bamboo chips shortening 25%, and other performances are without marked change.
Claims (5)
1. the sulfate pulping method of a compressed bamboo chips, it is characterized in that, after bamboo is chipped, drying and mechanical compress make it become the high density cuboid of regular shape from loose low-density state, then carry out slurrying with sulfate process, specifically comprise the following steps:
(1) get the raw materials ready: bamboo chipping machine is cut into the wood chip that size is qualified, screen out disintegrating slag and silt wherein;
(2) dry: bamboo chip is dried to 20～40min with rotary drying kiln or mesh-belt drier at 70-230 DEG C, make bamboo chip moisture content optimum carry out mechanical compress;
(3) compression: by dry after bamboo chip with full-automatic extruder at 400-1000kg/cm
2lower compression is grown into 150-340mm, the wide cuboid for 75-340mm, the high 60-140mm of being;
(4) boiling: adopt sulfate process to carry out boiling to compressed bamboo chips, based on the weight of over dry raw material, in NaOH, total alkali consumption is 15～22%, sulphidity 15～30%, liquor ratio 1: 6～1: 2.5,150～175 DEG C of maximum temperatures, heating-up time 120～250min, temperature retention time 80～180min;
(5) making beating: the sulfate pulp to compressed bamboo chips is pulled an oar, and beating consistency, lower cutter weight are to reduce fibre cutting as principle as far as possible.
2. the sulfate pulping method of a kind of compressed bamboo chips as claimed in claim 1, is characterized in that, bamboo described in step (1) is cizu, sinocalamus latiflorus, presss from both sides any one in bamboo, bambusa textile, green bamboo, red bamboo, mao bamboon and huge bamboo in vain.
3. the sulfate pulping method of a kind of compressed bamboo chips as claimed in claim 1, is characterized in that, the temperature that bamboo chip is dried in step (2) is 100～180 DEG C, and the moisture content that bamboo chip optimum carries out mechanical compress is 10～20%.
4. the sulfate pulping method of a kind of compressed bamboo chips as claimed in claim 1, is characterized in that, in step (3), the mechanical pressure of the compressed moulding of bamboo chip is 500～1000kg/cm
2.
5. the sulfate pulping method of a kind of compressed bamboo chips as claimed in claim 1, is characterized in that, in step (5), the sulfate pulp of compressed bamboo chips making beating principle is high dense, heavy beating.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110442216.XA CN102561079B (en) | 2011-12-27 | 2011-12-27 | Sulfate pulping method for compressed bamboo chips |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110442216.XA CN102561079B (en) | 2011-12-27 | 2011-12-27 | Sulfate pulping method for compressed bamboo chips |
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| CN102561079A CN102561079A (en) | 2012-07-11 |
| CN102561079B true CN102561079B (en) | 2014-08-20 |
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| CN201110442216.XA Expired - Fee Related CN102561079B (en) | 2011-12-27 | 2011-12-27 | Sulfate pulping method for compressed bamboo chips |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105177722A (en) * | 2015-08-11 | 2015-12-23 | 阜阳祥云木业有限公司 | Bamboo and wood fiber extraction technology |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044686A (en) * | 1989-01-30 | 1990-08-15 | 西北轻工业学院 | Join waste paper, awns stalk, wheat straw, straw manufacturing kraft liner board with mao bamboon (or mu bamboos, sundry bamboos) |
| CN1410627A (en) * | 2002-09-16 | 2003-04-16 | 成都春天绿竹资源开发有限责任公司 | Production technology of pure natural antibacterial bamboo paste |
| CN1693581A (en) * | 2005-04-27 | 2005-11-09 | 黄楚和 | Manufacturing method of soluble bamboo pulp |
| WO2008063014A1 (en) * | 2006-11-22 | 2008-05-29 | I'big, Inc. | Manufacturing method of bamboo chip and manufacturing method bamboo fiber using the bamboo chip |
| CN102154907A (en) * | 2011-04-28 | 2011-08-17 | 永州湘江纸业有限责任公司 | Bamboo pulping method |
-
2011
- 2011-12-27 CN CN201110442216.XA patent/CN102561079B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044686A (en) * | 1989-01-30 | 1990-08-15 | 西北轻工业学院 | Join waste paper, awns stalk, wheat straw, straw manufacturing kraft liner board with mao bamboon (or mu bamboos, sundry bamboos) |
| CN1410627A (en) * | 2002-09-16 | 2003-04-16 | 成都春天绿竹资源开发有限责任公司 | Production technology of pure natural antibacterial bamboo paste |
| CN1693581A (en) * | 2005-04-27 | 2005-11-09 | 黄楚和 | Manufacturing method of soluble bamboo pulp |
| WO2008063014A1 (en) * | 2006-11-22 | 2008-05-29 | I'big, Inc. | Manufacturing method of bamboo chip and manufacturing method bamboo fiber using the bamboo chip |
| CN102154907A (en) * | 2011-04-28 | 2011-08-17 | 永州湘江纸业有限责任公司 | Bamboo pulping method |
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