CN102677495B - Material preparation process suitable for preparing dissolving pulp by modifying bleached bamboo paper pulp - Google Patents
Material preparation process suitable for preparing dissolving pulp by modifying bleached bamboo paper pulp Download PDFInfo
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Abstract
The invention discloses a material preparation process suitable for preparing dissolving pulp by modifying bleached bamboo paper pulp. The process comprises the processes of preparing raw materials, dispersing, slicing, impregnating and the like. Aiming at the blenched bamboo paper pulp, the special process steps and process control parameters thereof are adopted; the aims of improving the quality of the finished product, saving energy and reducing emission can be fulfilled; the content of alpha cellulose, the yield and the whiteness of the finished product are improved; the ash content is reduced; the material preparation process is beneficial to the cost control of chemical industrial liquid medicine; a subsequent cooking and heating curve is stable; the concentration is uniformly reduced; and the prepared semi-finished product can be suitable for various cooking modes and has wide application range.
Description
Technical field
The present invention relates to a kind of material preparation technology for the preparation of dissolving pulp, more particularly, the present invention relates to a kind of material preparation technology being applicable to the modification of bleaching bamboo pulp and preparing dissolving pulp, belong to viscose fiber raw material-pulp preparing technical field.
Background technology
Along with the development of China's viscose industry, the raw materials for production of Cotton Pulp as viscose are prepared mainly with cotton linter by domestic enterprise.It is high that cotton linter has content of cellulose, fiber is long, intensity good, can be used for the advantage of producing multiple product, but the resource of raw material cotton linter is day by day shortage by the restriction of cultivated area and growth cycle, because the outstanding of ground contradiction striven by grain and cotton, the impact of long period and the ecological balance thereof, seriously constrains the development of China's viscose industry.Wood, bamboo dissolved pulp are used for viscose glue and produce by existing enterprise for this reason, but the price of import dissolving pulp is high, fluctuation large, have impact on the normal operation of enterprise.
Prepare dissolving pulp can adopt bleaching bamboo and wood paper pulp or not float true qualities bamboo and wood paper pulp, its preparation process comprise select materials, get the raw materials ready, boiling, bleaching, operation of washing and to manufacture paper with pulp etc., wherein select materials, source part that procedure for preparation is whole technique, the design of its technological process, the selection of technological parameter, can affect the carrying out of subsequent technique and the quality of final product to a great extent.
It is 200610021387.4 that State Intellectual Property Office discloses an application number in 2007.11.7, name is called the patent of invention of " Wood pomace modified producing technology ", this disclosure of the invention is for the production method of the pulp of viscose, and technical problem to be solved is to provide a kind of method of papermaking grade wood pulp plate production wood pulps.Wood pomace modified producing technology of the present invention, comprises the following steps: wood-pulp board paging, alkali steeping, discongest dispersion, boiling, washing, removal of impurities, bleaching, secondary washing, copy the dregs of rice; Wherein, described wood-pulp board paging, alkali steeping, discongest dispersion be by papermaking grade wood pulp plate through paging device one by one separately after, cyclone separator is fed by Belt Conveying through alkali spray, carry out discongesting dispersion with agitator, send into pressafiner and carry out extruding infiltration, technological parameter is: alkali charge is by wood-pulp board weight percent meter 6 ~ 17%, bath raio 1: 3 ~ 4.The wood pulps quality index adopting the present invention to produce reaches the requirement of dissolving pulp.Meet the production requirement of viscose, and production cost reduces, not by the impact of foreign price fluctuation, decrease the pollution to environment.
In above-mentioned document select materials and material preparation technology mainly for wood pulp sex change produce pulp, be unsuitable for bamboo pulp modification produce dissolving pulp.
It is 200710050472.8 that State Intellectual Property Office discloses an application number in 2008.3.26, name is called " paper-making-stage bamboo wood pulp plate denaturalization producing technique ", this invention provides a kind of modified production process of papermaking level bamboo wood-pulp board, solves that existing sex change wood pulps production technology also exists that wood-pulp board dipping is uneven, hemicellulose stripping slow, falls poly-difficulty, half steaming is even, boiling method is single, method for bleaching is single and the deficiency such as condition is violent.Step comprises wood-pulp board paging, alkali steeping, squeezes, discongests dispersion, boiling, washing, removal of impurities, bleaching, secondary washing, copies the dregs of rice; Wherein, described wood-pulp board paging, alkali steeping, squeezing discongest be by papermaking level bamboo wood-pulp board through paging device one by one separately after, sending into concentration is in the alkali steeping bucket of 6% ~ 18%, and flooding into concentration is after the slurry congee of 2.5% ~ 5%, is pumped into squeezer extrudes and discongest loosen collagen fibre with slurry congee.Adopt the present invention to make the quality of dissolving grade viscose wood pulps more excellent, more stable, raw material choose is wider.
It is 201110049038.4 that State Intellectual Property Office discloses an application number in 2011.09.14, name is called " compound pulp of a kind of paper pulp and cotton linter and preparation method thereof ", the invention provides a kind of method of paper pulp and cotton linter compound Making viscose fiber pulp, employing the method can by bamboo, wood, fiber crops, the special performance of the fibers such as bagasse combines with cotton excellent properties, can be other two or more paper pulp or bamboo arbitrarily, wood, cotton, fiber crops wait the boiling of raw material independence, after series of process process, dissolving pulp is prepared in bleaching section compound.The kind of the present invention's paper pulp used is not subject to the restriction of production method and raw material, it can be natural color pulp, also can be bleached pulp, by alkali steeping process, reduce pulp cooking difficulty, obtained dissolving pulp content of alphacellulose is high, maceration extract reusable edible, adopt in the method pulping process and pollute less, the recycle of alkali lye can be realized.
In above-mentioned two sections of documents select materials and material preparation technology mainly contain following problem:
1, wayward in producing, semi-manufactured goods quality is uneven, and end product quality is unstable; Greatly, cost is high for chemical industry soup, energy resource consumption;
2, in alkali steeping, fiber pervasion is uneven, and the stripping of non-fiber impurity is few, falls poly-unstable, uneven.
It is 201110217636.8 that State Intellectual Property Office discloses an application number in 2011.12.14, name is called " production process for modified papermaking grade wood pulp ", a kind of production process for modified papermaking grade wood pulp of this disclosure of the invention, it comprises suddenly following: (1) gets the raw materials ready, by papermaking grade wood pulp plate conveying feeding hydrabrusher, discongest dispersion through alkali spray and agitator, send into after squeezer carries out extrusion dehydration, feeding rotary spherical digester; (2) boiling, the slurry flooded enters rotary spherical digester and carries out boiling, adds caustic soda; (3) chlorination, carries out chlorination by boiling disposed slurry, adds hydrochloric acid, liquid chlorine, caustic soda; (4) bleach, the slurry after chlorination is sent into Bellmer and bleaches; (5) acid treatment, adds hydrochloric acid and carries out acid treatment, enters drift pond, manufacture paper with pulp, be packaged as wood pulps through paper machine through spray.The present invention fully discongests dispersion by utilizing hydrabrusher to slurry, makes xylon and soda-dip more even, increases substantially cooking homogeneities.By cooking process, non-cellulosic impurity content can be reduced, reduce the cotton fiber degree of polymerization.By chloride process, part foreign pigment can be removed, the fine content of corresponding raising first.By bleaching process, cellulose whiteness can be improved, and maintenance falls poly-, remove impurity.By acid treatment, can ash, irony be removed, improve reactivity worth.The modified papermaking grade wood pulp adopting the present invention to produce can reach the index request of dissolving pulp, meets the production requirement of viscose.
Selecting materials in above-mentioned document, the semi-finished product that material preparation technology is produced can only be applicable to minority boiling mode, have significant limitation, and labour intensity is large, and cost is high.
Summary of the invention
The present invention is intended to solve being unsuitable for of existing in above-mentioned prior art and bleaches the material preparation technology that bamboo pulp is modified as dissolving pulp, semi-finished product and final finished dissolving pulp of low quality, cost is high, be only applicable to the problem of minority boiling mode, a kind of material preparation technology of bleaching bamboo pulp modification and preparing dissolving pulp is provided.The present invention can improve get the raw materials ready after the quality of semi-finished product and last dissolving pulp finished product, reduce costs, its semi-finished product are applicable to all boiling modes.
In order to realize foregoing invention object, its concrete technical scheme is:
Be applicable to the material preparation technology that dissolving pulp is prepared in the modification of bleaching bamboo pulp, it is characterized in that: comprise following processing step:
A, raw material prepare
Be 100 ~ 250kg:1m according to bleaching bamboo pulp weight with the ratio of boiling vessel volume
3get the raw materials ready, choose bleaching bamboo pulp;
Bleaching bamboo pulp described is in step content of alphacellulose >=89%, the degree of polymerization 800 ~ 1200DP, content of ashes≤0.42%, whiteness >=68%.
Above-mentioned bleaching bamboo pulp is content of alphacellulose 89 ~ 92%, the degree of polymerization 800 ~ 1000DP, content of ashes 0.15 ~ 0.25%, whiteness 75 ~ 85%.
B, dispersion and section
Bleaching bamboo pulp dispersion treatment is become pulp board, then bleaching bamboo paper pulpboard is cut into fritter;
In stepb described bleaching bamboo paper pulpboard is cut into fritter after, then be ground into cotton-shaped or single fiber.
Above-mentioned fritter is the fritter of the length of side 8 ~ 100mm.
C, dipping
Mix through the bleaching bamboo pulp of dispersion with section with sodium hydroxide solution, obtain bleaching the mixture that bamboo pulp and sodium hydroxide solution mix and namely starch congee, control liquor ratio is 1:3 ~ 4, and the sodium hydrate solid weight in sodium hydroxide solution is 17 ~ 22% of fiber over dry gross weight in bleaching bamboo pulp;
Mix with sodium hydroxide solution with the bleaching bamboo pulp of section in disperseing passing through described in step C and refer to and will join in boiling vessel through the bleaching bamboo pulp disperseed with cut into slices, add sodium hydroxide solution simultaneously, dip time is 1 ~ 50 minute, and dipping temperature is 10 ~ 40 DEG C.
Mix with sodium hydroxide solution with the bleaching bamboo pulp of section in disperseing passing through described in step C and refer to and will join in boiling vessel by double helix kneading machine through the bleaching bamboo pulp disperseed with cut into slices, rub pulp grinder at bleaching bamboo pulp with the hands through double helix, rub in pulp grinder the steam and the sodium hydroxide solution that pass into 100 ~ 140 DEG C to double helix with the hands.
Liquor ratio (or being called bath raio) is this area technical term, refers to the ratio of fiber oven dry weight and sodium hydroxide solution volume in bleaching bamboo pulp.
D, flooded after enter next step cooking process.
This technique device therefor:
1, the boiling vessel in steps A and step C is rotary spherical digester, steamer or continuous steamer, and continuous steamer comprises horizontal continuous cooking device or tower continuous steamer;
2, the cutting in step B adopts cutter, scissors, cutting machine or cutting machine; Pulverizing adopts pulverizer, fluffer, squeezing pulverizer, stirring pulverizer or spiral pulverizer;
3, the double helix adopted in step C rubs pulp grinder with the hands, can also use cyclone separator.
The said equipment is this area conventional equipment.
The Advantageous Effects that the present invention brings:
1, bleach bamboo pulp fibre morphology evenly, finished product first fibre is higher containing height, viscous consistency, reactivity worth, there is antibacterial bacteriostatic function, fiber soft feeling be good, deodorization is good;
2, bleaching bamboo paper pulpboard is cut into pressure and the load that fritter can alleviate rear operation by the present invention, more excellent be ground into cotton-shaped or single fiber follow-up dipping can be made even, be conducive to the stripping of half fiber impurity, improve cooking quality, methylcellulose content is high;
3, material preparation technology process of the present invention is easy to control, and the semi-manufactured goods quality before boiling is even, and the ash content of end product is easy to control, and can save chemical industry soup well, shortens washing flow, saves water, electric consumption, reduces cost and the pollution to environment;
4, material preparation technology equipment investment of the present invention is few, and cost is low, and technological process is short and simple, and feed intake environment and place can be grasped flexibly;
5, the present invention adopts double helix kneading machine to drop in boiling vessel by raw material, in double helix kneading machine, pass into steam and the sodium hydroxide solution of 100 ~ 140 DEG C at raw material simultaneously, like this can the different raw material of equilibrium polymerization degree, make its degree of polymerization more close, improve impregnation uniformity and product quality;
6, the present invention is by the optimization of material preparation technology parameter system, reaches following effect:
(1) owing to making optimization to inventory and digesting apparatus volume ratio, the semi-finished product that making gets the raw materials ready obtains can load digesting apparatus well, medium density, be conducive to semi-finished product boiling where varus boilingly to rise, evenly soak into, produce easy to control, improve cooking quality, be conducive to evenly soaking into and to fiber homogeneous heating, having taken into account utilization rate and the economy of equipment simultaneously of liquid;
(2) pulp modifying of the prior art or sex change are prepared in the technique of dissolving pulp, its production of getting the raw materials ready is wayward, cause the poor quality of final product, and the present invention is by optimizing the standard of selecting materials, whole dissolving pulp production process is made to be easy to control, end product quality is stablized, and content of alphacellulose is high, yield is high; Finally obtained viscose pulp lighter color, alleviates bleaching pressure, and little to the damage of first fibre, environmental protection pressure is little;
(3) adopt stock dispersion of the present invention and section, impregnation technology parameter system, paper pulp fiber soaks into evenly, and non-cellulosic impurity stripping is many, can remove most of non-cellulosic impurity like this, falls poly-stable, is conducive to the cost control of chemical industry soup;
(4) adopt stock dispersion of the present invention and section, impregnation technology parameter system, be conducive to fiber and fully soak into, make follow-up boiling heating curve steady, fall evenly poly-, obtained semi-finished product are applicable to and various boiling mode, applied range;
(5) adopt technique and the parameter of impregnation steps of the present invention, evenly, every root fiber is all soaked into by alkali lye dipping, with fiber after NaOH hybrid infusion containing alkali >=3.0%, and first fibre >=20.0%, be conducive to boiling and fall evenly poly-, non-cellulosic impurity stripping is many;
(6) adopt technique and the parameter of impregnation steps of the present invention, fiber can be made to occur expanded, longitudinal contraction, diameter increases, and can improve the chemical activity of fiber, its result can make fiber moisture absorption, and chemical reaction ability and dye uptake strengthen; The a large amount of stripping of non-cellulosic impurity can also be made, in and the organic acid that produces in digestion process, saponification, grease, wax etc. contained by emulsification fiber, with reactions such as lignin;
(7) adopt double helix kneading machine dipping, pass into the steam of 100 ~ 140 DEG C, the degree of polymerization of paper pulp can be balanced well;
7, the present invention is directed to the wooden bamboo pulp raw material of bleaching, take above-mentioned specific processing step and process control parameter thereof, thus technical scheme integrally, can realize the object improving end product quality, energy-saving and emission-reduction, improves first fine content, yield and the whiteness of finished product, reduce ash content, be conducive to the cost control of chemical industry soup, make follow-up boiling heating curve steady, fall evenly poly-, obtained semi-finished product are applicable to and various boiling mode, applied range.
Detailed description of the invention
embodiment 1
Be applicable to the material preparation technology that dissolving pulp is prepared in the modification of bleaching bamboo pulp, comprise following processing step:
A, raw material prepare
Be 100kg:1m according to bleaching bamboo pulp weight with the ratio of boiling vessel volume
3get the raw materials ready, choose bleaching bamboo pulp;
B, dispersion and section
Bleaching bamboo pulp dispersion treatment is become pulp board, then bleaching bamboo paper pulpboard is cut into fritter;
C, dipping
Mix through the bleaching bamboo pulp of dispersion with section with sodium hydroxide solution, obtain bleaching the mixture that bamboo pulp and sodium hydroxide solution mix and namely starch congee, control liquor ratio is 1:3, and the sodium hydrate solid weight in sodium hydroxide solution is 17% of fiber over dry gross weight in bleaching bamboo pulp;
D, flooded after enter next step cooking process.
embodiment 2
Be applicable to the material preparation technology that dissolving pulp is prepared in the modification of bleaching bamboo pulp, comprise following processing step:
A, raw material prepare
Be 250kg:1m according to bleaching bamboo pulp weight with the ratio of boiling vessel volume
3get the raw materials ready, choose bleaching bamboo pulp;
B, dispersion and section
Bleaching bamboo pulp dispersion treatment is become pulp board, then bleaching bamboo paper pulpboard is cut into fritter;
C, dipping
Mix through the bleaching bamboo pulp of dispersion with section with sodium hydroxide solution, obtain bleaching the mixture that bamboo pulp and sodium hydroxide solution mix and namely starch congee, control liquor ratio is 1:4, and the sodium hydrate solid weight in sodium hydroxide solution is 22% of fiber over dry gross weight in bleaching bamboo pulp;
D, flooded after enter next step cooking process.
embodiment 3
Be applicable to the material preparation technology that dissolving pulp is prepared in the modification of bleaching bamboo pulp, comprise following processing step:
A, raw material prepare
Be 175kg:1m according to bleaching bamboo pulp weight with the ratio of boiling vessel volume
3get the raw materials ready, choose bleaching bamboo pulp;
B, dispersion and section
Bleaching bamboo pulp dispersion treatment is become pulp board, then bleaching bamboo paper pulpboard is cut into fritter;
C, dipping
Mix through the bleaching bamboo pulp of dispersion with section with sodium hydroxide solution, obtain bleaching the mixture that bamboo pulp and sodium hydroxide solution mix and namely starch congee, control liquor ratio is 1:3.5, and the sodium hydrate solid weight in sodium hydroxide solution is 19.5% of fiber over dry gross weight in bleaching bamboo pulp;
D, flooded after enter next step cooking process.
embodiment 4
Be applicable to the material preparation technology that dissolving pulp is prepared in the modification of bleaching bamboo pulp, comprise following processing step:
A, raw material prepare
Be 120kg:1m according to bleaching bamboo pulp weight with the ratio of boiling vessel volume
3get the raw materials ready, choose bleaching bamboo pulp;
B, dispersion and section
Bleaching bamboo pulp dispersion treatment is become pulp board, then bleaching bamboo paper pulpboard is cut into fritter;
C, dipping
Mix through the bleaching bamboo pulp of dispersion with section with sodium hydroxide solution, obtain bleaching the mixture that bamboo pulp and sodium hydroxide solution mix and namely starch congee, control liquor ratio is 1:3.8, and the sodium hydrate solid weight in sodium hydroxide solution is 21% of fiber over dry gross weight in bleaching bamboo pulp;
D, flooded after enter next step cooking process.
embodiment 5
On the basis of embodiment 1 ~ 4, preferred:
Bleaching bamboo pulp described is in step content of alphacellulose 89%, degree of polymerization 800DP, content of ashes 0.1%, whiteness 68%.
Above-mentioned bleaching bamboo pulp is content of alphacellulose 89%, degree of polymerization 800DP, content of ashes 0.15%, whiteness 75%.
In stepb described bleaching bamboo paper pulpboard is cut into fritter after, then be ground into cotton-shaped or single fiber.
Be the fritter of length of side 8mm with above-mentioned fritter in stepb.
The impregnation technology of step C has following two kinds of embodiments:
Embodiment 1: mix with sodium hydroxide solution with the bleaching bamboo pulp of section in disperseing passing through described in step C and refer to and will join in boiling vessel through the bleaching bamboo pulp disperseed with cut into slices, add sodium hydroxide solution simultaneously, dip time is 1 minute, and dipping temperature is 10 DEG C.
Embodiment 2: mix with sodium hydroxide solution with the bleaching bamboo pulp of section in disperseing passing through described in step C and refer to and will join in boiling vessel by double helix kneading machine through the bleaching bamboo pulp disperseed with cut into slices, rub pulp grinder at bleaching bamboo pulp with the hands through double helix, rub in pulp grinder the steam and the sodium hydroxide solution that pass into 100 DEG C to double helix with the hands.
embodiment 6
On the basis of embodiment 1 ~ 4, preferred:
Bleaching bamboo pulp described is in step content of alphacellulose 95%, degree of polymerization 1200DP, content of ashes 0.42%, whiteness 90%.
Above-mentioned bleaching bamboo pulp is content of alphacellulose 92%, degree of polymerization 1000DP, content of ashes 0.25%, whiteness 85%.
In stepb described bleaching bamboo paper pulpboard is cut into fritter after, then be ground into cotton-shaped or single fiber.
Be the fritter of length of side 100mm with above-mentioned fritter in stepb.
The impregnation technology of step C has following two kinds of embodiments:
Embodiment 1: mix with sodium hydroxide solution with the bleaching bamboo pulp of section in disperseing passing through described in step C and refer to and will join in boiling vessel through the bleaching bamboo pulp disperseed with cut into slices, add sodium hydroxide solution simultaneously, dip time is 50 minutes, and dipping temperature is 40 DEG C.
Embodiment 2: mix with sodium hydroxide solution with the bleaching bamboo pulp of section in disperseing passing through described in step C and refer to and will join in boiling vessel by double helix kneading machine through the bleaching bamboo pulp disperseed with cut into slices, rub pulp grinder at bleaching bamboo pulp with the hands through double helix, rub in pulp grinder the steam and the sodium hydroxide solution that pass into 140 DEG C to double helix with the hands.
embodiment 7
On the basis of embodiment 1 ~ 4, preferred:
Bleaching bamboo pulp described is in step content of alphacellulose 92%, degree of polymerization 1000DP, content of ashes 0.26%, whiteness 79%.
Above-mentioned bleaching bamboo pulp is content of alphacellulose 90.5%, degree of polymerization 900DP, content of ashes 0.2%, whiteness 80%.
In stepb described bleaching bamboo paper pulpboard is cut into fritter after, then be ground into cotton-shaped or single fiber.
Be the fritter of length of side 54mm with above-mentioned fritter in stepb.
The impregnation technology of step C has following two kinds of embodiments:
Embodiment 1: mix with sodium hydroxide solution with the bleaching bamboo pulp of section in disperseing passing through described in step C and refer to and will join in boiling vessel through the bleaching bamboo pulp disperseed with cut into slices, add sodium hydroxide solution simultaneously, dip time is 25.5 minutes, and dipping temperature is 25 DEG C.
Embodiment 2: mix with sodium hydroxide solution with the bleaching bamboo pulp of section in disperseing passing through described in step C and refer to and will join in boiling vessel by double helix kneading machine through the bleaching bamboo pulp disperseed with cut into slices, rub pulp grinder at bleaching bamboo pulp with the hands through double helix, rub in pulp grinder the steam and the sodium hydroxide solution that pass into 120 DEG C to double helix with the hands.
embodiment 8
On the basis of embodiment 1 ~ 4, preferred:
Bleaching bamboo pulp described is in step content of alphacellulose 90%, degree of polymerization 950DP, content of ashes 0.3%, whiteness 75%.
Above-mentioned bleaching bamboo pulp is content of alphacellulose 91%, degree of polymerization 850DP, content of ashes 0.22%, whiteness 78%.
In stepb described bleaching bamboo paper pulpboard is cut into fritter after, then be ground into cotton-shaped or single fiber.
Be the fritter of length of side 35mm with above-mentioned fritter in stepb.
The impregnation technology of step C has following two kinds of embodiments:
Embodiment 1: mix with sodium hydroxide solution with the bleaching bamboo pulp of section in disperseing passing through described in step C and refer to and will join in boiling vessel through the bleaching bamboo pulp disperseed with cut into slices, add sodium hydroxide solution simultaneously, dip time is 10 minutes, and dipping temperature is 30 DEG C.
Embodiment 2: mix with sodium hydroxide solution with the bleaching bamboo pulp of section in disperseing passing through described in step C and refer to and will join in boiling vessel by double helix kneading machine through the bleaching bamboo pulp disperseed with cut into slices, rub pulp grinder at bleaching bamboo pulp with the hands through double helix, rub in pulp grinder the steam and the sodium hydroxide solution that pass into 115 DEG C to double helix with the hands.
embodiment 9
Be applicable to the material preparation technology that dissolving pulp is prepared in the modification of bleaching bamboo pulp, it is characterized in that: comprise following processing step:
A, raw material prepare
Be 100 ~ 250kg:1m according to bleaching bamboo pulp weight with the ratio of boiling vessel volume
3get the raw materials ready, choose bleaching bamboo pulp; Get the raw materials ready according to aforementioned proportion, make the medium density in boiling vessel;
Bleaching bamboo pulp described is in step content of alphacellulose >=89%, the degree of polymerization 800 ~ 1200DP, content of ashes≤0.42%, whiteness >=68%.
Be more preferably, reach the balance of material quality and economy, above-mentioned bleaching bamboo pulp is content of alphacellulose 89 ~ 92%, the degree of polymerization 800 ~ 1000DP, content of ashes 0.15 ~ 0.25%, whiteness 75 ~ 85%.
B, dispersion and section
Bleaching bamboo pulp dispersion treatment is become pulp board, then bleaching bamboo paper pulpboard is cut into fritter;
The starting pulps bought back one to wrap, and dispersion adopts bale opener packaging to be opened, and re-uses paging cutter and raw material is divided into pulp board one by one, finally uses and feed dregs of rice machine conveying pulp board to cutting cutting equipment and disintegrating apparatus;
In stepb described bleaching bamboo paper pulpboard is cut into fritter after, then be ground into cotton-shaped or single fiber.
Above-mentioned fritter is the fritter of the length of side 8 ~ 100mm.
C, dipping
Mix through the bleaching bamboo pulp of dispersion with section with sodium hydroxide solution, obtain bleaching the mixture that bamboo pulp and sodium hydroxide solution mix and namely starch congee, control liquor ratio is 1:3 ~ 4, and the sodium hydrate solid weight in sodium hydroxide solution is 17 ~ 22% of fiber over dry gross weight in bleaching bamboo pulp;
Dipping process has two kinds of concrete preferred embodiments:
Embodiment 1: mix with sodium hydroxide solution with the bleaching bamboo pulp of section in disperseing passing through described in step C and refer to and will join in boiling vessel through the bleaching bamboo pulp disperseed with cut into slices, add sodium hydroxide solution simultaneously, dip time is 1 ~ 50 minute, and dipping temperature is 10 ~ 40 DEG C.
Embodiment 2: mix with sodium hydroxide solution with the bleaching bamboo pulp of section in disperseing passing through described in step C and refer to and will join in boiling vessel by double helix kneading machine through the bleaching bamboo pulp disperseed with cut into slices, rub pulp grinder at bleaching bamboo pulp with the hands through double helix, rub in pulp grinder the steam and the sodium hydroxide solution that pass into 100 ~ 140 DEG C to double helix with the hands.
Liquor ratio (or being called bath raio) is this area technical term, refers to the ratio of fiber oven dry weight and sodium hydroxide solution volume in bleaching bamboo pulp.
D, flooded after enter next step cooking process.
This technique device therefor:
1, the boiling vessel in steps A and step C is rotary spherical digester, steamer or continuous steamer, and continuous steamer comprises horizontal continuous cooking device or tower continuous steamer;
2, the cutting in step B adopts cutter, scissors, cutting machine or cutting machine; Pulverizing adopts pulverizer, fluffer, squeezing pulverizer, stirring pulverizer or spiral pulverizer;
3, the double helix adopted in step C rubs pulp grinder with the hands, can also use cyclone separator.
The said equipment is this area conventional equipment.
embodiment 10
Digesting technoloy:
The semi-finished product obtained getting the raw materials ready carry out boiling, the steam pipe of described continuous steamer is set to 3 sections, one section that is connected with pre-reaction feed bin is provided with the T-shaped pipe adding alkali lye and the steam pipe adding steam, and other two sections are equipped with the steam pipe adding steam, and its digesting technoloy requires as follows:
Liquor ratio: 1:2.0 ~ 4.0;
Cooking liquor is added by 17 ~ 30% of oven dry weight;
The vapor (steam) temperature of one section be connected with pre-reaction feed bin of described steam pipe is 105 ± 5 DEG C;
The vapor (steam) temperature of middle one section is 140 ± 5 DEG C;
The vapor (steam) temperature of one section that is connected with cold spraying device is 150 DEG C ~ 175 DEG C;
Compression ratio: 1:2 ~ 3.0.
Described digestant is NaOH and Na
2sO
3mixed solution, mixed proportion is NaOH:Na
2sO
3=90 ~ 98%:2 ~ 10%.
embodiment 11
Aftertreatment technology:
Bellmer after the pulp of boiling sends into alkali tune is carried out sodium hypochlorite bleaching 18 ~ 25 minutes, and after dechlorination, acid treatment, namely complete bleaching, technological parameter is as follows:
Alkali tune amount: 20 ~ 200g/m
3;
Clorox consumption: 0.1 ~ 0.6g/l;
Hypo consumption: 1.8 ~ 2 times of residual chlorine;
Acid treatment: hydrochloric acid consumption 1 ~ 4%, processes 30 ~ 60 minutes;
Calgon consumption 0.5 ~ 2%;
Consumption of oxalic acid 0.5 ~ 2%;
Bleaching temperature 30 ~ 60 DEG C;
Process flow of manufacturing paper with pulp is: compound stock tank-copy forebay-stuff box-desander-pulp machine-cut paper stacker-weighing balance-baling press-warehouse-in, and technological parameter comprises:
To manufacture paper with pulp desanding concentration: 0.6 ~ 1.5%;
Manufacture paper with pulp desanding pressure: 0.15 ~ 0.32MPa;
Size mixing with water: clear water, plain boiled water;
Online concentration: 0.6 ~ 1.5%;
One squeeze pressure: 0.1 ~ 0.3MPa;
Second press pressure: 0.2 ~ 0.5MPa;
Three road squeeze pressure: 0.3 ~ 0.7MPa;
Drying cylinder steam pressure: 0.15 ~ 0.35MPa;
Cut paper specification: 600*800;
Gauge: 100 ~ 250Kg/ wraps.
embodiment 12
The dissolving pulp that the semi-finished product that material preparation technology of the present invention obtains adopt conventional digesting technoloy and aftertreatment technology to obtain with do not adopt material preparation technology of the present invention to obtain the Indexes Comparison of the semi-finished product dissolving pulp that adopts conventional digesting technoloy and aftertreatment technology to obtain:
After material preparation technology of the present invention, under the prerequisite of the degree of polymerization ensureing finished product, first fine content, yield and the whiteness of finished product dissolving pulp all have lifting, play remarkable effect especially to reduction ash content.
Claims (1)
1. be applicable to the material preparation technology that dissolving pulp is prepared in the modification of bleaching bamboo pulp, it is characterized in that: comprise following processing step:
A, raw material prepare
Be 100kg:1m according to bleaching bamboo pulp weight with the ratio of boiling vessel volume
3get the raw materials ready, choose bleaching bamboo pulp; Described bleaching bamboo pulp is content of alphacellulose 91%, degree of polymerization 850DP, content of ashes 0.22%, whiteness 78%;
B, dispersion and section
Bleaching bamboo pulp dispersion treatment is become pulp board, then bleaching bamboo paper pulpboard is cut into fritter, after bleaching bamboo paper pulpboard is cut into fritter, then be ground into cotton-shaped or single fiber; Described fritter is the fritter of length of side 35mm;
C, dipping
Mix through the bleaching bamboo pulp of dispersion with section with sodium hydroxide solution, obtain bleaching the mixture that bamboo pulp and sodium hydroxide solution mix and namely starch congee, control liquor ratio is 1:3, and the sodium hydrate solid weight in sodium hydroxide solution is 17% of fiber over dry gross weight in bleaching bamboo pulp; Described mixing with sodium hydroxide solution by the bleaching bamboo pulp through dispersion and section refers to that will pass through the bleaching bamboo pulp disperseed and cut into slices join in boiling vessel, and add sodium hydroxide solution, dip time is 10 minutes simultaneously, and dipping temperature is 30 DEG C;
D, flooded after enter next step cooking process.
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| US1997153A (en) * | 1933-10-21 | 1935-04-09 | Pou Jose Sala | Manufacture of alpha cellulose |
| CN1385287A (en) * | 2002-06-21 | 2002-12-18 | 上海化纤浆粕总厂 | Bamboo pulp denatured productive technology |
| CN101148836A (en) * | 2007-11-12 | 2008-03-26 | 宜宾长毅浆粕有限责任公司 | Paper-making-stage bamboo wood pulp plate denaturalization producing technique |
| CN101736633A (en) * | 2009-12-17 | 2010-06-16 | 宜宾长毅浆粕有限责任公司 | Stewing process for preparing bamboo dissolving pulp by utilizing natural-color unbleached bamboo pulp in a modifying way |
| CN102127877A (en) * | 2010-12-28 | 2011-07-20 | 宜宾竹海竹资源科技有限责任公司 | Production process of bamboo-dissolving pulp |
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| CN1690305A (en) * | 2004-04-20 | 2005-11-02 | 曹平 | Production of paper stock for moulding environmentally-friendly dinnerware and process for charging pulp board fabrics |
| CN101818460B (en) * | 2009-12-17 | 2012-06-27 | 宜宾长毅浆粕有限责任公司 | Method for preparing wood dissolving pulp by modifying true color unbleached wood pulp |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1997153A (en) * | 1933-10-21 | 1935-04-09 | Pou Jose Sala | Manufacture of alpha cellulose |
| CN1385287A (en) * | 2002-06-21 | 2002-12-18 | 上海化纤浆粕总厂 | Bamboo pulp denatured productive technology |
| CN101148836A (en) * | 2007-11-12 | 2008-03-26 | 宜宾长毅浆粕有限责任公司 | Paper-making-stage bamboo wood pulp plate denaturalization producing technique |
| CN101736633A (en) * | 2009-12-17 | 2010-06-16 | 宜宾长毅浆粕有限责任公司 | Stewing process for preparing bamboo dissolving pulp by utilizing natural-color unbleached bamboo pulp in a modifying way |
| CN102127877A (en) * | 2010-12-28 | 2011-07-20 | 宜宾竹海竹资源科技有限责任公司 | Production process of bamboo-dissolving pulp |
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