CN114960250B - Fluff pulp preparation method and fluff pulp - Google Patents
Fluff pulp preparation method and fluff pulp Download PDFInfo
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- CN114960250B CN114960250B CN202210594799.6A CN202210594799A CN114960250B CN 114960250 B CN114960250 B CN 114960250B CN 202210594799 A CN202210594799 A CN 202210594799A CN 114960250 B CN114960250 B CN 114960250B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/04—Kraft or sulfate pulp
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/06—Sulfite or bisulfite pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Abstract
The application discloses a fluff pulp preparation method, which comprises the following steps: (1) providing plant fiber slurry with the concentration of 3% -5%; (2) Extracting water in the plant fiber slurry to obtain blocky slurry with dryness of 35-65%; (3) Fluffing the blocky slurry to obtain fine blocky slurry; (4) Drying and dispersing the small blocky slurry to obtain velvet slurry with the dryness of 85-95%; (5) And (3) defibering the fluffy pulp at a high speed to obtain fluff pulp, so that the fiber bundle content of the fluff pulp is lower than 0.5%. The application provides a fluff pulp preparation method, adopts the plant fiber raw materials to prepare the fluff pulp that low reaches health products enterprise can directly use, and the selection range of raw materials is extensive, has overcome the defect that pulp board fluff pulp exists, and this fluff pulp need not through smashing, the process of raising, has reduced the energy consumption of raising of low reaches health products enterprise, has improved production efficiency. The application also provides the fluff pulp prepared by the fluff pulp preparation method.
Description
Technical Field
The application relates to the technical field of fluff pulp manufacturing, in particular to a fluff pulp preparation method and fluff pulp.
Background
In recent years, the global fluff pulp demand has increased at a rate of 5% per year, and the annual fluff pulp demand in China has reached millions of tons. The main performance requirements for the fluff pulp are large absorption capacity, high absorption speed and high bulkiness.
Currently, fluff pulp on the market is in a pulp board (flat or roll) form, and downstream sanitary enterprises need to make the fluff pulp board available after further processing through processes of crushing, raising and the like, so that the fluff pulp board needs to have excellent raising performance so as to facilitate the forming of a downstream process Wei Pin.
In view of the above, the selection of the raw material for the pulp board type fluff pulp is more critical, and at the present stage, the softwood fiber has thick and long fiber, and has the inherently good raising performance and absorption performance, and is the best raw material for producing the fluff pulp. Other fiber raw materials such as bamboo fiber have high combination degree of the fluff pulp board due to high content of hemicellulose and heterocyte, are not easy to untwin and rise and cannot be widely used; in the prior art, the bamboo fluff pulp board meets the fluff requirement by adding the debonding agent, but the addition of the debonding agent can obviously reduce the absorption performance and the fluffy degree of the bamboo fluff pulp, and the bonding force of the bamboo fluff pulp board is reduced by greatly reducing the pressure of a pressing line so as to meet the fluff requirement, so that the drying energy consumption of a rear section can be obviously increased, and the pulp board is easy to break before entering a drying part.
Disclosure of Invention
In view of the defects of the prior art, the application provides a fluff pulp preparation method, the selection range of raw materials is wide, the fluff pulp prepared by the fluff pulp preparation method does not need to be crushed and raised, the fluff pulp can be directly used for Wei Pin molding, and the absorption performance and the dry fluffiness of the fluff pulp are excellent.
The technical scheme adopted by the application is as follows: a fluff pulp preparation method is provided, which comprises the following steps:
(1) Providing plant fiber slurry with the concentration of 3% -5%;
(2) Extracting water in the plant fiber slurry to obtain blocky slurry with dryness of 35-65%;
(3) Fluffing the blocky slurry to obtain fine blocky slurry;
(4) Drying and dispersing the small blocky slurry to obtain velvet slurry with the dryness of 85-95%;
(5) And (3) defibering the fluffy pulp at a high speed to obtain fluff pulp, so that the fiber bundle content of the fluff pulp is lower than 0.5%.
As an improvement to the above scheme, the plant fiber slurry is a primary color slurry obtained by the plant fiber raw material through the processes of material preparation, prehydrolysis and cooking; the plant fiber raw material is at least one of needle-leaved wood, broad-leaved wood, bamboo, cotton, hemp, reed, rice straw or bagasse.
In an improvement of the above scheme, the plant fiber pulp is a bleached pulp obtained by bleaching and washing the primary color pulp.
As an improvement to the scheme, in the step (2), the plant fiber pulp is pumped to a double-roller pulp extruder, and the moisture in the plant fiber pulp is extruded to obtain the block pulp with the dryness of 40-60%.
As an improvement to the scheme, in the step (3), the blocky slurry enters a defibering device through a crushing screw conveyor to be subjected to fluffing treatment.
As an improvement on the scheme, in the step (4), the fine blocky slurry is dried and heated by high-speed hot air, and then enters a cyclone separator for moisture separation and dispersion to obtain the fluffy slurry with the dryness of 85% -95%; the heating temperature of the high-speed hot air drying is 170-220 ℃.
In the step (5), the fluff pulp is defibered at a high speed by a defibering device with the rotating speed of 3000-5000 rpm to obtain the fluff pulp.
As an improvement to the scheme, the fluff pulp preparation method further comprises the step of shaping and packaging the fluff pulp obtained in the step (5): the fluff pulp is sucked into a shaping device under negative pressure for shaping; and packaging the sized fluff pulp.
As an improvement to the scheme, the suction pressure of the negative pressure suction is 0.001-0.05 Mpa, and the fluff pulp after being shaped is in a cube shape or a spherical shape.
Another technical scheme adopted by the application is as follows: provides a fluff pulp which is prepared by the fluff pulp preparation method and has the dry bulk of 22.0-27.0 cm 3 The water absorption capacity is 8.0-10.0 g/g, and the water absorption time is 2.0-4.0 s.
Has the advantages that: the application provides a fluff pulp preparation method, adopt the plant fiber raw materials to prepare the fluff pulp that low reaches health products enterprise can directly use, overcome the defect that pulp board fluff pulp production and application exist, the selection range of raw materials is extensive, and the absorbency and the fluffy performance of the fluff pulp of making are excellent, and this fluff pulp need not through smashing, the process of raising, can reduce the raising energy consumption of low reaches health products enterprise, improves production efficiency. The application also provides the fluff pulp prepared by the fluff pulp preparation method.
Detailed Description
The present application will be described in further detail with reference to examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive step are within the scope of the present application.
The application provides a fluff pulp preparation method, which comprises the following steps:
(1) Providing plant fiber pulp with the concentration of 3-5%.
Further, the plant fiber slurry is obtained by the steps of preparing a plant fiber raw material, pre-hydrolyzing and cooking, and the plant fiber slurry is primary color slurry.
Wherein the plant fiber raw material comprises but is not limited to at least one of needle-leaved wood, broad-leaved wood, bamboo, cotton, hemp, reed, rice straw or bagasse.
When the plant fiber raw material is softwood or hardwood, the plant fiber pulp is chemical wood pulp or chemical mechanical wood pulp such as sulfate wood pulp, sulfite wood pulp, caustic soda wood pulp and the like, or the plant fiber pulp is mercerized wood pulp or cross-linked wood pulp obtained by chemically treating wood pulp; when the plant fiber raw material is bamboo, cotton, hemp, reed, rice straw or bagasse, the plant fiber pulp is chemical non-wood pulp or chemical mechanical non-wood pulp such as sulfate non-wood pulp, sulfite non-wood pulp, caustic soda non-wood pulp and the like.
In the application, the plant fiber pulp can be pure wood pulp, pure non-wood pulp or mixed pulp of wood pulp and non-wood pulp.
In one embodiment, the plant fiber slurry is sulfate slurry, and specifically, the plant fiber raw material is cut into raw material segments or raw material sheets with predetermined specifications and then is filled into a cooking pot; introducing water or steam from the bottom of the digester, heating to 140-170 ℃, and preserving heat for 20-40 minutes to carry out prehydrolysis; injecting white liquid accounting for 5-8% of the weight of the absolutely dry raw materials into a cooking pot, heating to 160-180 ℃, and preserving heat for 40-120 minutes for cooking; injecting dilute black liquor at 70-90 ℃ from the bottom of the cooking pot to replace hot black liquor in the pot, and pumping out primary color slurry in the pot when the temperature in the pot is reduced to below 90 ℃; adding water to dilute the primary color slurry, and simultaneously pumping the primary color slurry to a slurry tower to ensure that the concentration of the primary color slurry in the slurry tower is 3-5 percent.
In a preferred embodiment, the plant fiber slurry is a slurry obtained by subjecting the plant fiber raw material to material preparation, prehydrolysis, cooking, bleaching and washing processes, and the plant fiber slurry is a bleached slurry.
In the embodiment, the primary color pulp obtained by the plant fiber raw material through the processes of material preparation, prehydrolysis and cooking is sent to the oxygen delignification process and then passes through the D 0 -E OP -D 1 Bleaching is completed in the working procedure to obtain bleached pulp; adding water to dilute the slurry and pumping the bleached slurry to a pulp tower to make the concentration of the bleached slurry in the pulp tower be 3-5%.
(2) Extracting water in the plant fiber slurry obtained in the step (1) to obtain block slurry with the dryness of 35-65%.
Further, pumping the plant fiber pulp in the pulp tower in the step (1) to a double-roll pulp extruder, and extruding water in the pulp tower to obtain the blocky pulp with the dryness of 40-60%.
The double-roller pulp extruder comprises two rollers which rotate oppositely and are arranged side by side, and the roller surfaces of the rollers are provided with water filtering grooves or small filtering holes.
And pumping the plant fiber pulp into a roll nip of a two-roll squeezer from the upper part, squeezing the plant fiber pulp by two roll surfaces with preset roll spacing, squeezing out water in the plant fiber pulp, and discharging the water through the draining grooves or small filtering holes to obtain block pulp.
Specifically, the dryness of the block-shaped slurry can be controlled to be 40% -60% by adjusting the roller spacing, the roller rotating speed and the like.
(3) And (3) fluffing the blocky slurry to obtain fine blocky slurry.
And (3) further, the blocky slurry obtained in the step (2) enters a defibering device through a crushing screw conveyor to be subjected to fluffing treatment.
The fluffing treatment is not particularly limited as long as the slurry can be mechanically defibered. The fluffing treatment can be performed, for example, by using a defibrator capable of forming single fibers of the bulk slurry. Examples of the defibrating device include: waring's beater, rotating disc refiner, other well known defibrators, and the like.
The fine block-shaped slurry obtained in this step is a slurry similar to a fluff-like slurry.
(4) Drying and dispersing the fine blocky slurry to obtain the fluffy slurry with the dryness of 85-95 percent.
Further, the fine blocky slurry is dried and heated by high-speed hot air, and then enters a cyclone separator for moisture separation and dispersion, so that the fluffy slurry with the dryness of 85% -95% is obtained.
Wherein the heating temperature of the high-speed hot air drying (namely the temperature of the high-speed hot air) is 170-220 ℃.
Specifically, a high-speed hot air drying cylinder with the diameter of 3m is adopted to perform high-speed hot air drying and heating on the fine massive slurry, the fine massive slurry is sucked from the bottom of the drying cylinder and is discharged from the top, the fine massive slurry penetrates through the high-speed hot air drying cylinder from bottom to top in the process, the fine massive slurry is heated by high-speed flowing hot air instantly, and bound water in the slurry is extracted to the outside of fibers.
The flow speed of the hot air is 12-18 m/s.
The high-speed hot air drying process further disperses and dries the fine block-shaped slurry similar to fluff into fluff-shaped slurry almost forming single fibers.
The heated fluffy pulp discharged from the top of the high-speed hot air drying cylinder and the water vapor enter a cyclone separator simultaneously, hot air and fine dust are discharged from the upper part of the separator to take away the water vapor separated from the pulp, and the dried fluffy pulp is discharged from the lower part of the separator.
The dryness of the velvet pulp is controlled to be 85-95%.
(5) And (3) defibering the fluffy pulp at a high speed to obtain fluff pulp, so that the fiber bundle content of the fluff pulp is lower than 0.5%.
Further, the fluff pulp is subjected to high-speed fluffing through a fluffer with the rotating speed of 3000-5000 rpm to obtain the fluff pulp.
And (4) carrying out high-speed defibering on the fluffy pulp obtained in the step (4) through the defibering device, wherein pulp clusters which are not formed into single fibers are broken up to obtain the completely fluffed fluff pulp.
In this application, a fully napped fluff pulp is defined as a fluff pulp having a tow content of less than 0.5%.
The fiber bundle refers to bundle-like fibers which are not completely dispersed into single fibers in the fluff pulp.
A typical method of determining the fiber bundle content of fluff pulp is weighing the material on a given sieve plate, e.g. PFI minimum fiber bundle analyzer, pulmac fiber bundle analyzer, all according to this principle; there are also optical measurements, such as PQM and FiberExpert fiber bundle analyzers, which determine the fiber bundle content based on the length and width of the projected area.
The application provides a fluff pulp preparation method, with plant fiber as the raw materials, the selection range of raw materials is extensive, wood fiber such as needle wood, broad leaf wood, bamboo, cotton, hemp, reed, wheat straw, bagasse and other non-wood fiber all can regard as the raw materials, make by this fluff pulp preparation method the fluff pulp of complete fluff ization, downstream health products enterprise can directly use, need not through necessary crushing of fluff pulp board, the process of raising, reduce raising energy consumption, improve production efficiency.
The preparation method of the fluff pulp solves the problems of insufficient absorption performance and dry fluffy degree of the fluff pulp (such as bamboo fluff pulp) caused by using the bond-breaking agent in the production process of the fluff pulp of the pulp board, and various problems possibly caused by reducing the binding force of the fluff pulp board by reducing the pressure of a pressing line.
The fluff pulp prepared by the fluff pulp preparation method has excellent absorption performance and fluffiness, and meets the corresponding index requirements in the latest fluff pulp national standard.
In this application, the absorbency of fluff pulp refers to the amount of water absorbed and the time taken to absorb water.
In a preferred embodiment, the method for preparing fluff pulp provided by the present application further includes a step of performing sizing and baling on the fluff pulp obtained in step (5), specifically: and (3) sucking the fluff pulp into a setting device under negative pressure for setting, and then packaging and setting the fluff pulp.
The fluff pulp after being packed is loose fluff pulp mass, downstream sanitary product enterprises can directly feed through vacuum negative pressure, the procedures of crushing, napping and the like when the downstream sanitary product enterprises use the existing pulp-plate-shaped fluff pulp as raw materials are reduced, napping energy consumption is reduced, and production efficiency is improved.
Furthermore, the suction pressure of the negative pressure suction is 0.001-0.05 Mpa, so that the binding force cannot be generated in the fluff pulp in the packing process, and the shaped fluff pulp can be easily dispersed into single fibers, so that the fluff pulp can be directly applied to downstream sanitary product enterprises.
It can be understood that the shaped fluff pulp is in accordance with the shape of the shaper, and preferably, the shaped fluff pulp is in a cubic shape or a spherical shape.
The application also provides the fluff pulp which is prepared by the preparation method of the fluff pulp, and the dry bulk density of the fluff pulp is 22.0-27.0 cm 3 The water absorption capacity is 8.0-10.0 g/g, the water absorption time is 2.0-4.0 s, and the requirements of the latest national fluff pulp standard GB/T21331-2021 on dry bulk, water absorption capacity and water absorption time of fluff pulp are met.
The following are specific examples of the fluff pulp preparation methods provided herein.
The first embodiment is as follows:
the embodiment provides a fluff pulp preparation method, which comprises the following steps:
s11, diluting bamboo pulp obtained by bamboo through the processes of material preparation, prehydrolysis and cooking, and pumping to a pulp tower to enable the concentration of the natural color bamboo pulp in the pulp tower to be 3.5%.
Wherein the natural color bamboo pulp is sulfate natural color bamboo pulp.
S12, pumping the natural color bamboo pulp in the pulp tower S11 to a double-roller pulp extruder, and extruding water in the pulp tower to obtain blocky natural color bamboo pulp with the dryness of 40%.
And S13, allowing the blocky natural color bamboo pulp obtained in the S12 to enter a defibering device through a crushing screw conveyor for fluffing treatment to obtain fine blocky natural color bamboo pulp which is similar to fluffy natural color bamboo pulp.
S14, drying and heating the fine blocky natural color bamboo pulp through high-speed hot air, then, enabling the fine blocky natural color bamboo pulp to enter a cyclone separator for moisture separation and dispersion to obtain the fluffy natural color bamboo pulp with the dryness of 95%.
Wherein the heating temperature of the high-speed hot air drying is 220 ℃.
And the high-speed hot air drying process further disperses and dries the fine blocky natural color bamboo pulp which is similar to the fluffy natural color bamboo pulp into the fluffy natural color bamboo pulp which is almost single fiber.
S15, carrying out high-speed defibering on the velvet natural-color bamboo pulp through a defibering device with the rotating speed of 3000rpm, wherein pulp clusters which are not formed into single fibers are broken up, and obtaining the completely fluffed velvet bamboo pulp.
And S16, sucking the fluffy bamboo pulp obtained in the step S15 to a shaping device under negative pressure for shaping, and then packaging and shaping the fluffy bamboo pulp.
Further, the suction pressure of the negative pressure suction is 0.008Mpa.
The bamboo pulp containing 0.3% of fiber bundles and having a dry bulk of 22.93cm was prepared by the method of this example 3 Water absorption capacity of 8.8g/g and water absorption time of 3.5s.
Example two:
the embodiment provides a fluff pulp preparation method, which comprises the following steps:
s21, diluting natural color bamboo pulp obtained by bamboo through the processes of material preparation, prehydrolysis and cooking, and pumping to a pulp tower to enable the concentration of the natural color bamboo pulp in the pulp tower to be 4.5%.
S22, pumping the natural color bamboo pulp in the pulp tower S21 to a double-roller pulp extruder, and extruding water in the pulp tower to obtain blocky natural color bamboo pulp with the dryness of 45%.
And S23, allowing the blocky natural color bamboo pulp obtained in the S22 to enter a fiber decomposing device through a crushing screw conveyor for villification treatment to obtain fine blocky natural color bamboo pulp which is similar to villous natural color bamboo pulp.
S24, drying and heating the fine blocky natural color bamboo pulp through high-speed hot air, then, enabling the fine blocky natural color bamboo pulp to enter a cyclone separator for moisture separation and dispersion to obtain the fluffy natural color bamboo pulp with the dryness of 90%.
Wherein the heating temperature of the high-speed hot air drying is 200 ℃.
And the high-speed hot air drying process further disperses and dries the fine blocky natural color bamboo pulp which is similar to the velvet shape into the velvet natural color bamboo pulp which is almost single fiber.
S25, carrying out high-speed defibering on the velvet natural-color bamboo pulp through a defibering device with the rotating speed of 4000rpm, wherein pulp clusters which are not formed into single fibers are broken up, and obtaining the completely fluffed velvet bamboo pulp.
S26, sucking the fluffy bamboo pulp obtained in the step S25 to a shaper through negative pressure for shaping, and then packaging and shaping the fluffy bamboo pulp.
Further, the suction pressure of the negative pressure suction is 0.001Mpa.
The bamboo pulp containing 0.4% of fiber bundles and 23.58cm of dry bulk was prepared by the method of this example 3 Water absorption capacity of 9.0g/g and water absorption time of 3.6s.
Example three:
the embodiment provides a fluff pulp preparation method, which comprises the following steps:
s31, the bleached bamboo pulp obtained by the bamboo through the processes of material preparation, prehydrolysis, cooking, bleaching and washing is diluted and then is pumped to a pulp tower, so that the concentration of the bleached bamboo pulp in the pulp tower is 4.0%.
And S32, pumping the bleached bamboo pulp in the pulp tower S31 to a double-roller pulp extruder, and extruding water in the double-roller pulp extruder to obtain blocky bleached bamboo pulp with the dryness of 50%.
And S33, allowing the blocky bleached bamboo pulp obtained in the S32 to enter a defibering device through a crushing screw conveyor for fluffing treatment to obtain fine blocky bleached bamboo pulp which is approximately fluffy bleached bamboo pulp.
S34, drying and heating the small blocky bleached bamboo pulp through high-speed hot air, then, enabling the small blocky bleached bamboo pulp to enter a cyclone separator for moisture separation and dispersion to obtain the velvet bleached bamboo pulp with the dryness of 85%.
Wherein the heating temperature of the high-speed hot air drying is 180 ℃.
The high-speed hot air drying procedure further disperses and dries the fine blocky bleached bamboo pulp which is similar to the velvet shape into the velvet bleached bamboo pulp which is almost single fiber.
S35, the velvet bleached bamboo pulp is subjected to high-speed defibering through a defibering device with the rotating speed of 5000rpm, wherein pulp clusters which are not formed into single fibers are scattered, and the completely fluffed velvet bamboo pulp is obtained.
S36, sucking the fluffy bamboo pulp obtained in the step S35 to a shaper through negative pressure for shaping, and then packaging and shaping the fluffy bamboo pulp.
Further, the suction pressure of the negative pressure suction is 0.01Mpa.
The bamboo pulp containing 0.2% of fiber bundles and having a dry bulk of 22.27cm was prepared by the method of this example 3 Water absorption capacity of 9.0g/g and water absorption time of 3.5s.
Example four:
the embodiment provides a fluff pulp preparation method, which comprises the following steps:
s41, the bleached bamboo pulp obtained by the bamboo through the processes of material preparation, prehydrolysis, cooking, bleaching and washing is diluted and then is pumped into a pulp tower, so that the concentration of the bleached bamboo pulp in the pulp tower is 3.8%.
And S42, pumping the bleached bamboo pulp in the pulp tower S41 to a double-roller pulp extruder, and extruding water in the double-roller pulp extruder to obtain blocky bleached bamboo pulp with the dryness of 60%.
And S43, allowing the blocky bleached bamboo pulp obtained in the step S42 to enter a defibering device through a crushing screw conveyor for fluffing treatment to obtain fine blocky bleached bamboo pulp which is approximately fluffy bleached bamboo pulp.
And S44, drying and heating the fine blocky bleached bamboo pulp through high-speed hot air, and then, introducing the fine blocky bleached bamboo pulp into a cyclone separator for moisture separation and dispersion to obtain the velvet bleached bamboo pulp with the dryness of 94%.
Wherein the heating temperature of the high-speed hot air drying is 170 ℃.
The high-speed hot air drying process further disperses and dries the fine blocky bleached bamboo pulp which is similar to the fluffy shape into the fluffy bleached bamboo pulp which is almost single fiber.
S45, carrying out high-speed defibering on the velvet bleached bamboo pulp through a defibering device with the rotating speed of 4000rpm, wherein pulp clusters which are not formed into single fibers are broken up, and obtaining the completely fluffed velvet bamboo pulp.
S46, sucking the fluffy bamboo pulp obtained in the step S45 to a shaping device under negative pressure for shaping, and then packaging and shaping the fluffy bamboo pulp.
Further, the suction pressure of the negative pressure suction is 0.05Mpa.
The bamboo pulp containing 0.15% of fiber bundles and having a dry bulk of 22.27cm was prepared by the method of this example 3 Water absorption capacity of 9.2g/g and water absorption time of 3.3s.
Example five:
the embodiment provides a fluff pulp preparation method, which comprises the following steps:
s51, diluting natural color softwood pulp obtained by subjecting softwood to the processes of material preparation, prehydrolysis and cooking, and pumping to a pulp tower to enable the concentration of the natural color softwood pulp in the pulp tower to be 4.5%.
S52, pumping the natural color softwood pulp in the S51 pulp tower to a double-roller pulp extruder, and extruding moisture in the natural color softwood pulp to obtain blocky natural color softwood pulp with the dryness of 45%.
And S53, allowing the natural color softwood pulp obtained in the S52 to enter a defibering device through a crushing screw conveyor for fluffing treatment to obtain fine blocky natural color softwood pulp which is similar to fluffy natural color softwood pulp.
S54, drying and heating the fine blocky true-color softwood pulp through high-speed hot air, and then, enabling the fine blocky true-color softwood pulp to enter a cyclone separator for moisture separation and dispersion to obtain fluffy true-color softwood pulp with dryness of 88%.
Wherein the heating temperature of the high-speed hot air drying is 200 ℃.
And the high-speed hot air drying process further disperses and dries the fine blocky true-color softwood pulp similar to the fluff shape into the fluff-shaped true-color softwood pulp almost forming single fibers.
S55, carrying out high-speed defibering on the fluffy natural-color softwood pulp through a defibering device with the rotating speed of 3500rpm, wherein pulp clusters which are not formed into single fibers are broken up, and obtaining the completely fluffed softwood pulp.
S56, the fluff softwood pulp obtained in the step S55 is subjected to negative pressure suction to a shaping device for shaping, and then is packaged and shaped.
Further, the suction pressure of the negative pressure suction is 0.003Mpa.
The fluff softwood pulp prepared by the fluff pulp preparation method of the embodiment has the fiber bundle content of 0.15 percent and the dry bulk of 24.89cm 3 The water absorption capacity was 9.2g/g and the water absorption time was 2.6s.
Example six:
the embodiment provides a fluff pulp preparation method, which comprises the following steps:
s61, the bleached softwood pulp obtained by the softwood through the processes of material preparation, prehydrolysis, cooking, bleaching and washing is diluted and then pumped to a pulp tower, so that the concentration of the bleached softwood pulp in the pulp tower is 4.2%.
S62, pumping the bleached bamboo softwood pulp in the S61 pulp tower to a double-roller pulp extruder, and extruding water in the bleached bamboo softwood pulp to obtain blocky bleached softwood pulp with the dryness of 50%.
And S63, allowing the blocky bleached softwood pulp obtained in the S62 to enter a defibering device through a crushing screw conveyor to be subjected to fluffing treatment to obtain fine blocky bleached softwood pulp which is similar to fluffy bleached softwood pulp.
And S64, drying and heating the fine blocky bleached softwood pulp through high-speed hot air, and then, introducing the fine blocky bleached softwood pulp into a cyclone separator for moisture separation and dispersion to obtain fluffy bleached softwood pulp with the dryness of 93%.
Wherein the heating temperature of the high-speed hot air drying is 180 ℃.
The high-speed hot air drying process further disperses and dries the fine bulk bleached softwood pulp that is similar to fluff into fluff bleached softwood pulp that is nearly a single fiber.
S65, fluffy bleached softwood pulp is subjected to high-speed fluffing through a fluffer with the rotation speed of 4000rpm, wherein pulp groups which do not form single fibers are broken up, and the fluffy softwood pulp which is completely fluffed is obtained.
S66, the fluff softwood pulp obtained in the step S65 is subjected to negative pressure suction to a sizing device for sizing, and then is packaged and sized.
Further, the suction pressure of the negative pressure suction is 0.005Mpa.
The fluff softwood pulp prepared by the fluff pulp preparation method of the embodiment has a fiber bundle content of 0.1% and a dry bulk of 25.55cm 3 Water absorption capacity of 9.2g/g and water absorption time of 3.0s.
Example seven:
the embodiment provides a fluff pulp preparation method, which comprises the following steps:
s71, the bleached softwood pulp obtained by the softwood through the processes of material preparation, prehydrolysis, cooking, bleaching and washing is diluted and then is pumped to a pulp tower, so that the concentration of the bleached softwood pulp in the pulp tower is 3.5%.
And S72, pumping the bleached bamboo softwood pulp in the pulp tower S71 to a double-roller pulp extruder, and extruding water in the bleached bamboo softwood pulp to obtain blocky bleached softwood pulp with the dryness of 60%.
And S73, allowing the blocky bleached softwood pulp obtained in the S72 to enter a defibering device through a crushing screw conveyor to be subjected to fluffing treatment to obtain fine blocky bleached softwood pulp which is similar to fluffy bleached softwood pulp.
S74, drying and heating the fine blocky bleached softwood pulp through high-speed hot air, then, enabling the fine blocky bleached softwood pulp to enter a cyclone separator for moisture separation and dispersion, and obtaining the fluffy bleached softwood pulp with the dryness of 86%.
Wherein the heating temperature of the high-speed hot air drying is 170 ℃.
The high-speed hot air drying process further disperses and dries the fine bulk bleached softwood pulp that is similar to fluff into fluff bleached softwood pulp that is nearly a single fiber.
S75, the fluffy bleached softwood pulp is subjected to high-speed defibering through a defibering device with the rotating speed of 4000rpm, wherein pulp clusters which are not formed into single fibers are broken up, and the completely fluffed softwood pulp is obtained.
And S76, sucking the fluff softwood pulp obtained in the step S75 to a shaper through negative pressure, and then packing and shaping the fluff softwood pulp.
Further, the suction pressure of the negative pressure suction is 0.004Mpa.
The fluff softwood pulp prepared by the fluff pulp preparation method of the embodiment has a fiber bundle content of 0.1% and a dry bulk of 26.20cm 3 Water absorption capacity of 9.3g/g and water absorption time of 2.8s.
In the present application, the detection criteria/method for the physical property index related to the fluff pulp are as follows:
measurement of Dry bulk:
(1) weighing the fluff pulp with the weight of 3g, and dispersing into single fibers by using a universal pulverizer.
(2) And (3) manually and uniformly spreading the fluff pulp on a forming device with holes at the bottom, wherein the diameter of the bottom of the forming device is 50mm, and the diameter of the holes is 1.5mm.
(3) And lightly putting a weight with the weight of 500 g on the upper part of a former to press the fluff pulp, and recording the height of the sample after 30s as the fluffy height h and the dry fluffy degree of 0.655h.
Measurement of Water absorption Capacity and Water absorption time:
after the determination of the dry bulk is finished, a former with weights and fluff pulp is placed in a beaker (a stainless steel ring is placed in the beaker to facilitate the placement of the former) which is pre-filled with a proper amount of distilled water at the temperature of 28 ℃, timing is started when the water begins to soak the bottom of the fluff pulp layer, the recording of the water absorption time s is stopped after a sample is soaked, and two effective numbers are taken.
And taking out the former after the sample absorbs water for 30 seconds, naturally dripping water for 30 seconds, moving out a weight on the former, and weighing the wet velvet Mao Jiang net weight to obtain the water absorption weight G, wherein the water absorption weight is (G-3)/3.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications, equivalents, flow charts, and other related technical fields that are made by the present specification or directly or indirectly are included in the scope of the present application.
Claims (7)
1. A fluff pulp preparation method is characterized by comprising the following steps:
(1) Providing plant fiber slurry with the concentration of 3% -5%;
(2) Extracting water in the plant fiber slurry to obtain blocky slurry with dryness of 35-65%;
(3) Fluffing the blocky slurry to obtain fine blocky slurry;
(4) Drying and dispersing the fine blocky slurry to obtain velvet slurry with the dryness of 85-95%;
(5) Defibering the fluffy pulp at a high speed to obtain fluff pulp, so that the fiber bundle content of the fluff pulp is lower than 0.5 percent;
the plant fiber slurry is primary color slurry obtained by the steps of preparing plant fiber raw materials, pre-hydrolyzing and cooking; the plant fiber raw material is at least one of needle-leaved wood and bamboo, in the step (3), the blocky pulp enters a defibering device through a crushing screw conveyor to be subjected to fluffing treatment, and in the step (5), the fluffy pulp is subjected to high-speed defibering through a defibering device at the rotating speed of 3000-5000 rpm to obtain the fluff pulp.
2. The method of producing fluff pulp according to claim 1, wherein said vegetable fiber pulp is a bleached pulp obtained by subjecting said raw-color pulp to bleaching and washing steps.
3. The fluff pulp preparation method according to claim 1, wherein in the step (2), the plant fiber pulp is pumped to a two-roll squeezer, and the water is squeezed out, so that the block pulp with the dryness of 40-60% is obtained.
4. The fluff pulp preparation method according to claim 1, wherein in the step (4), the fine block-shaped pulp is dried and heated by high-speed hot air, and then enters a cyclone separator for moisture separation and dispersion to obtain the fluff-shaped pulp with the dryness of 85-95%; the heating temperature of the high-speed hot air drying is 170-220 ℃.
5. The method of claim 1, further comprising the step of size-setting and baling said fluff pulp from step (5): the fluff pulp is sucked into a shaping device under negative pressure for shaping; and packaging the sized fluff pulp.
6. The method of claim 5, wherein the suction pressure of the negative pressure suction is 0.001 to 0.05Mpa, and the shaped fluff pulp has a cubic or spherical shape.
7. A fluff pulp, characterized by being produced by the fluff pulp production method according to any one of claims 1 to 6, and having a dry bulk of 22.0 to 27.0cm 3 Water absorption per gramThe amount is 8.0-10.0 g/g, and the water absorption time is 2.0-4.0 s.
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| CN102535235A (en) * | 2012-03-09 | 2012-07-04 | 陕西科技大学 | Bleached needle wood fluff pulp board and manufacturing method thereof |
| JP2012211411A (en) * | 2011-03-31 | 2012-11-01 | Nippon Paper Industries Co Ltd | Paper containing fluffed pulp |
| CN106510970A (en) * | 2016-11-19 | 2017-03-22 | 天津市娇柔卫生制品有限公司 | Production process for fluff pulp for pad core layer in sanitary pad |
| CN113249999A (en) * | 2021-05-24 | 2021-08-13 | 泰盛科技（集团）股份有限公司 | Preparation method of bamboo velvet pulp |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012211411A (en) * | 2011-03-31 | 2012-11-01 | Nippon Paper Industries Co Ltd | Paper containing fluffed pulp |
| CN102535235A (en) * | 2012-03-09 | 2012-07-04 | 陕西科技大学 | Bleached needle wood fluff pulp board and manufacturing method thereof |
| CN106510970A (en) * | 2016-11-19 | 2017-03-22 | 天津市娇柔卫生制品有限公司 | Production process for fluff pulp for pad core layer in sanitary pad |
| CN113249999A (en) * | 2021-05-24 | 2021-08-13 | 泰盛科技（集团）股份有限公司 | Preparation method of bamboo velvet pulp |
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