CN109577058B - Production equipment and production method of single-layer craft paper - Google Patents
Production equipment and production method of single-layer craft paper Download PDFInfo
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- CN109577058B CN109577058B CN201811449080.3A CN201811449080A CN109577058B CN 109577058 B CN109577058 B CN 109577058B CN 201811449080 A CN201811449080 A CN 201811449080A CN 109577058 B CN109577058 B CN 109577058B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
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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
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
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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
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
Abstract
The invention discloses production equipment of single-layer kraft liner board, which comprises a pulper, a deslagging device connected with the pulper, a coarse screen connected with the deslagging device, a classifying screen connected with the coarse screen, long fiber processing equipment, short fiber processing equipment and a paper machine paper making device, wherein a good pulp outlet of the classifying screen is connected with the short fiber processing equipment, and a tail pulp outlet of the classifying screen is connected with the long fiber processing equipment; the production method of the single-layer kraft liner board comprises the steps of pulping waste paper, classifying and screening, treating short fiber pulp, treating long fiber pulp, preparing pulp and papermaking. According to the production equipment and the production method of the single-layer kraft liner board, the pulp line is treated by 2 sections, so that a large amount of equipment investment and subsequent maintenance cost are saved compared with the original 3 sections; the investment of the paper machine is greatly reduced, and a large amount of equipment investment and power consumption are saved; the energy consumption of electric power, steam and the like is greatly reduced; the drying equipment is designed to be single-hung, so that the drying equipment is easier to clean and has high operation stability; the low-quantization trend of the industry is guided, and the resources are saved.
Description
Technical Field
The invention relates to the technical field of pulping and papermaking, in particular to production equipment and a production method of single-layer kraft liner board.
Background
The main raw materials for papermaking are derived from wood fibers, China is a country with scarce forest resources, the goal of pursuing by the industry is how to produce qualified products by using the minimum resources, particularly in the field of packaging paper, the industry is cognizant on how to produce the maximum amount of packaging boxes by using the minimum resources, and all the industrial packaging paper is developed towards low quantity at present so as to pursue the production of the largest-area packaging by using the minimum resources.
At present, all designs of the craft paper are 2-layer or 3-layer designs, the gram weight is 90gsm (per square meter gram weight) at the lowest to satisfy the requirement of the craft paper with high gram weight, and simultaneously, the size line divides the size into long fibers, medium fibers and short fibers in order to satisfy the requirement of different sizes of each layer, and then the processing is carried out respectively, and after the processing, the paper machine is respectively matched with the size to flow to the internet, and a large amount of equipment is needed to be configured, therefore, the equipment investment is large, the maintenance cost is high, and the power consumption is high. Based on the above, the low-gram-weight single-layer craft paper 80-85gsm is specially developed and produced to realize double saving of raw materials and power consumption.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides production equipment and a production method of single-layer craft paper, and the technical scheme is as follows:
the invention provides production equipment of single-layer kraft liner board, which comprises a pulper, a deslagging device connected with the pulper, a coarse screen connected with the deslagging device, a classifying screen connected with the coarse screen, long fiber processing equipment, short fiber processing equipment and a paper machine papermaking device, wherein a good pulp outlet of the classifying screen is connected with the short fiber processing equipment, and a tail pulp outlet of the classifying screen is connected with the long fiber processing equipment; the short fiber treatment equipment comprises a first desander, a first multi-disc concentrator connected with the first desander and a first heat dispersion device connected with the first multi-disc concentrator; the long fiber treatment equipment comprises a fine screen, a second desander connected with the fine screen, a second multi-disc concentrator connected with the second desander, a heat dispersing device connected with the second multi-disc concentrator and a disc mill connected with a second heat dispersing device; the paper machine paper making device comprises a paper machine pulp tank and a feeding device connected with the paper machine pulp tank.
Further, the production equipment also comprises a short fiber pulp pool connected with the first heat dispersion device and a long fiber pulp pool connected with the disc mill; and the outlet of the short fiber pulp tank and the outlet of the long fiber pulp tank are both connected with the paper machine pulp tank.
Further, the production equipment also comprises a color online scanner for detecting the color of the finished single-layer kraft paper.
The invention also provides a production method of the single-layer craft paper, which comprises the following steps:
step 5, slurry preparation: respectively pumping the first short fiber pulp in the step 3 and the first long fiber pulp in the step 4 to a paper machine pulp pool for mixing to form mixed pulp;
Further, in step 6, adding dyes, including a first-addition dye and a second-addition dye, the first-addition dye: conveying the mixed slurry obtained in the step 5 to a screen, conveying the dye into the screen through a feeding device, conveying the dry strength agent with a preset weight into a head box after the dye and the mixed slurry are conveyed to the head box through the screen, and forming a first mixed slurry after the dry strength agent and the mixed slurry are fully mixed; adding a dye for the second time: and then, sequentially carrying out the forming step, the pressing step and the drying step on the first mixed slurry, then carrying out surface sizing, adding a dye during sizing, and carrying out the post-drying step, the calendaring step and the reeling step after the sizing is finished to finally prepare a single-layer craft paper finished product.
Further, in the step 6, the dye is added once, and the added dye accounts for 25% -35% of the total weight of the dye; in the step 7 of adding the dye for the second time, the added dye accounts for 65-75% of the total weight of the dye.
Further, in the step 6, the mixed slurry in the step 5 is conveyed to a head box through a screen in front of a net, and a dry strength agent with a preset weight is conveyed into the head box; and then, sequentially carrying out the forming step, the pressing step and the drying step on the mixed slurry, carrying out surface soaking and sizing, adding a dye during sizing, and carrying out the post-drying step, the calendaring step and the reeling step after sizing is finished to finally prepare a single-layer kraft paper finished product.
Furthermore, the slit width of the slit-shaped screen plate of the grading screen equipment is 0.2mm, the pulp with the particles larger than 0.2mm is used as long fiber pulp, and the pulp with the particles smaller than 0.2mm is used as short fiber pulp.
Further, the pulping concentration of the waste paper pulp in the step 1 is controlled to be 4-6%; the weight share range of the dry strength agent correspondingly prepared by the mixed slurry with unit volume in the step 6 is 15-40 Kg.
Further, the drying equipment used in the drying step in the step 6 is provided with a layer of drying net.
The technical scheme provided by the invention has the following beneficial effects:
a. the slurry line designed by the invention adopts 2-section treatment, and saves a large amount of equipment investment and subsequent maintenance cost compared with the original 3-section treatment;
b. the investment of the paper machine is greatly reduced, and a large amount of equipment investment and power consumption are saved; the energy consumption of electric power, steam and the like is greatly reduced;
c. the drying equipment is designed to be single-hung, so that the drying equipment is easier to clean and has high operation stability, and the problems of paper breakage, hidden quality troubles and customer complaints caused by accumulation of paper wool and sticky matters are effectively solved;
d. the low-quantization trend of the industry is guided, and the resources are saved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method of producing single ply craft paper according to an embodiment of the invention;
FIG. 2 is a flow chart of another method for producing single ply craft paper according to embodiments of the present invention;
fig. 3 is a schematic structural diagram of a production facility of a single-ply craft paper provided by an embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.
Example 1
The invention provides production equipment of a single-layer kraft liner board, which is shown in a figure 3 and comprises a pulper, a deslagging device connected with the pulper, a coarse screen connected with the deslagging device, a classifying screen connected with the coarse screen, long fiber processing equipment, short fiber processing equipment and a paper machine papermaking device, wherein a good pulp outlet of the classifying screen is connected with the short fiber processing equipment, and a tail pulp outlet of the classifying screen is connected with the long fiber processing equipment; the short fiber treatment equipment comprises a first desander, a first multi-disc concentrator connected with the first desander and a first heat dispersion device connected with the first multi-disc concentrator; the long fiber treatment equipment comprises a fine screen, a second desander connected with the fine screen, a second multi-disc concentrator connected with the second desander, a heat dispersing device connected with the second multi-disc concentrator and a disc mill connected with a second heat dispersing device; the paper machine papermaking device comprises a paper machine pulp tank and a feeding device connected with the paper machine pulp tank, and the feeding device is preferably a screw pump.
The production equipment also comprises a short fiber pulp tank connected with the first heat dispersion device and a long fiber pulp tank connected with the disc mill; and the outlet of the short fiber pulp tank and the outlet of the long fiber pulp tank are both connected with the paper machine pulp tank.
The papermaking device of the paper machine further comprises a screen front screen, a head box, a screen part, a squeezing part, a drying device, a sizing device, a rear drying part, a calendaring device and a curling device which are sequentially arranged.
Example 2
The invention provides a production method of single-layer craft paper, which is shown in figure 1 and comprises the following steps:
step 5, slurry preparation: conveying the first short fiber pulp in the step 3 to a short fiber pulp tank, conveying the first long fiber pulp in the step 4 to a long fiber pulp tank, and respectively pumping the first short fiber pulp and the first long fiber pulp to a paper machine pulp tank for mixing to form mixed pulp;
and 7, adding a dye for the second time: and (3) sequentially carrying out the forming step, the pressing step and the drying step on the first mixed slurry in the step (6), then carrying out surface sizing, adding a dye during sizing, and finally preparing a finished product of the single-layer craft paper after carrying out the post-drying step, the calendaring step and the reeling step.
In the step 6, the feeding device is arranged between the slurry feeding pump and the slurry flushing pump, the feeding device is used for adding dye, the feeding device is preferably a screw pump, and the screw pump is in variable frequency arrangement and can adjust the flow rate according to the frequency; before adding the dye, softened water can be used for diluting the dye in advance, and the addition amount of the softened water and the addition amount of the dye can be controlled according to a proportion so as to ensure the stable dilution times. In the step 6, in the primary dye adding, the dye is conveyed into a fan pump, the dye comprises a red dye and a yellow dye, the red dye and the yellow dye are added simultaneously, the adding amount of the red dye and the yellow dye is the same, and the sum of the added red dye and the added yellow dye accounts for 25-35% of the total weight of the dye to be added, preferably 30%; in the step 7, in the secondary dye adding, the sum of the red dye and the yellow dye added in the sizing process (the red dye and the yellow dye are added simultaneously and the addition amount is the same) accounts for 65-75 percent of the total weight of the dye to be added, and the preferable amount is 70 percent.
Example 3
The invention provides another production method of single-layer craft paper, which is shown in figure 2 and comprises the following steps:
step 5, slurry preparation: conveying the first short fiber pulp in the step 3 to a short fiber pulp tank, conveying the first long fiber pulp in the step 4 to a long fiber pulp tank, and respectively pumping the first short fiber pulp and the first long fiber pulp to a paper machine pulp tank for mixing to form mixed pulp;
In examples 2 and 3, the waste paper includes cultural waste paper and packaging waste paper, and the packaging waste paper includes waste cardboard paper; the slit width of a slit-shaped sieve plate of the grading sieve equipment is 0.2mm, the pulp with the particle size larger than 0.2mm is used as long fiber pulp, and the pulp with the particle size smaller than 0.2mm is used as short fiber pulp.
When single-layer kraft liner is produced, in order to ensure the strength of the kraft liner, a dry strength agent is required to be added into a pulp flowing box, and the dry strength agent is used as a chemical auxiliary material to improve the paper forming strength of the kraft liner, so that when mixed pulp is conveyed into the pulp flowing box through a screen, the dry strength agent with preset weight is conveyed into the pulp flowing box, the weight share range of the dry strength agent prepared correspondingly to the mixed pulp with unit volume is 15-40Kg, the unit volume is one ton, and preferably 25Kg of dry strength agent is added into each ton of the mixed pulp; in addition, the weight proportion of the added dry strength agent can be adjusted and changed according to raw materials and processes, and the addition amount of the dry strength agent influences the strength of the final single-layer kraft liner board finished product.
In the embodiment 3, only the dye is added during surface sizing, so that the use amount of the dye is low, the cost can be reduced, uneven dyeing is easy to occur, and the yield is influenced; however, in the embodiment 2, the surface film transfer sizing is adopted, and the uniform dyeing can be realized by 30% of internal pulp dyeing and 70% of surface sizing dyeing, so that the qualification rate of the single-layer kraft liner finished product is improved.
Furthermore, the slurry is thermally dispersed by using thermal dispersion equipment, and by utilizing the high-temperature mechanical dispersion principle, sticky matters, wax-soluble matters and the like in the slurry can be dissolved and dispersed into substances invisible to naked eyes, so that the cleanliness of the slurry is improved.
Further, the production equipment also comprises a color online scanner for detecting the color of the single-layer kraft liner finished product, and the color online scanner can be used for carrying out color online scanning and interval detection on the single-layer kraft liner finished product, so that the dye addition amount is adjusted according to detection data, and the automatic control of production is realized.
Furthermore, the single-layer kraft liner board is produced, the drying equipment used in the drying step only needs to be designed into single hanging, namely only one layer of drying net is arranged on the front side, so that the single-layer kraft liner board is simpler and easier to clean, the operation stability is improved, and the problems of paper breakage, hidden quality troubles and customer complaints caused by accumulation of paper fluff and sticky matters are effectively solved.
The invention relates to a production equipment machine of single-layer kraft liner boards and a matched pulp line system, wherein the pulp line is designed to be only divided into long fibers and short fibers, and the long fibers are ground into pulp; one set of medium fiber processing system is reduced, and 1-2 sets of approach flow systems, one layer of net part and a matched vacuum white water ventilation system are reduced in the paper machine; meanwhile, the single-layer kraft liner board is easy to dry, a large number of drying devices and ventilation devices are reduced, the drying part is designed to be hung in a single row, the kraft liner board is easy to clean, and the operation stability is obviously improved; the single-layer craft paper produced by adding the dry strength agent as the reinforcing additive into the fiber slurry can achieve the effect and the requirement of the double-layer craft paper, and the problems of poor compounding, paper breaking and the like caused by low gram weight of the double-layer craft paper during paper making are avoided.
The invention provides production equipment and a production method of single-layer craft paper, wherein a pulp line is treated by 2 sections, and compared with the original 3 sections, a large amount of equipment investment and subsequent maintenance cost are saved; the investment of the paper machine is greatly reduced, and a large amount of equipment investment and power consumption are saved; the energy consumption of electric power, steam and the like is greatly reduced; the drying equipment is designed to be single-hung, so that the drying equipment is easier to clean and has high operation stability, and the problems of paper breakage, hidden quality troubles and customer complaints caused by accumulation of paper wool and sticky matters are effectively solved; the low-quantization trend of the industry is guided, and the resources are saved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. The production method of the single-layer craft paper is characterized by utilizing production equipment of the single-layer craft paper, and comprises the following steps:
step 1, pulping waste paper: putting the waste paper into a pulper for pulping, and then sequentially performing a deslagging step and a coarse screening step to prepare waste paper pulp;
step 2, grading and screening: conveying the waste paper pulp obtained in the step 1 to a grading sieve device for grading screening treatment, firstly obtaining short fiber pulp from a good pulp outlet of the grading sieve device, and then obtaining long fiber pulp from a tail pulp outlet of the grading sieve device, wherein the mass percentage content range of the short fiber pulp is 50-60%;
step 3, short fiber slurry treatment: sequentially carrying out deslagging, concentration and thermal dispersion on the short fiber slurry obtained in the step 2 to obtain a first short fiber slurry, wherein the pulping concentration of the first short fiber slurry is controlled to be 5-6%, and the beating degree is within a numerical range of 35-45 DEG SR;
step 4, long fiber slurry treatment: after the long fiber pulp obtained in the step 2 is sequentially subjected to a fine screening step, a deslagging step, a concentrating step, a thermal dispersion step and a disc grinding step, a first long fiber pulp is prepared, the pulp forming concentration of the first long fiber pulp is controlled to be 5% -6%, and the numerical range of the beating degree is 30-40 DEG SR;
step 5, slurry preparation: respectively pumping the first short fiber pulp in the step 3 and the first long fiber pulp in the step 4 to a paper machine pulp pool for mixing to form mixed pulp;
step 6, papermaking: adding a dye at one time: conveying the mixed slurry obtained in the step 5 to a screen, conveying the dye into the screen through a feeding device, conveying the dry strength agent with a preset weight into a head box after the dye and the mixed slurry are conveyed to the head box through the screen, and forming a first mixed slurry after the dry strength agent and the mixed slurry are fully mixed; in the primary dye adding process, the added dye accounts for 25-35% of the total weight of the dye, the dye comprises red dye and yellow dye, and the red dye and the yellow dye are added simultaneously;
adding a dye for the second time: then, sequentially carrying out a forming step, a pressing step and a drying step on the first mixed slurry, then carrying out surface sizing, adding a dye during sizing, and carrying out a post-drying step, a calendaring step and a reeling step after sizing is finished to finally prepare a single-layer craft paper finished product; in the secondary dye adding process, the added dye accounts for 65-75% of the total weight of the dye, the dye comprises red dye and yellow dye, and the red dye and the yellow dye are added simultaneously and have the same adding amount; or the like, or, alternatively,
in the step 6, the mixed slurry in the step 5 is conveyed to a head box through a screen in front of a net, and a dry strength agent with preset weight is conveyed into the head box; then, after the mixed slurry is subjected to a forming step, a squeezing step and a drying step in sequence, surface soaking and sizing are carried out, dyes are added during sizing, the dyes comprise red dyes and yellow dyes, and the red dyes and the yellow dyes are added at the same time and are added in the same amount; after sizing is finished, performing a post-drying step, a calendaring step and a coiling step to finally prepare a single-layer craft paper finished product;
the drying equipment used in the drying step in the step 6 is provided with a layer of dry net;
in the step 1, the pulping concentration of the waste paper pulp is controlled to be 4-6%; the weight share range of the dry strength agent correspondingly prepared by the mixed slurry with unit volume in the step 6 is 15-40 Kg.
2. The production method of the single-layer kraft liner board according to claim 1, wherein the production equipment of the single-layer kraft liner board comprises a pulper, a deslagging device connected with the pulper, a coarse screen connected with the deslagging device, a classifying screen connected with the coarse screen, a long fiber treatment device, a short fiber treatment device and a paper machine papermaking device, wherein a good pulp outlet of the classifying screen is connected with the short fiber treatment device, and a tail pulp outlet of the classifying screen is connected with the long fiber treatment device;
the short fiber treatment equipment comprises a first desander, a first multi-disc concentrator connected with the first desander and a first heat dispersion device connected with the first multi-disc concentrator; the long fiber treatment equipment comprises a fine screen, a second desander connected with the fine screen, a second multi-disc concentrator connected with the second desander, a second heat dispersion device connected with the second multi-disc concentrator and a disc mill connected with the second heat dispersion device; the paper machine papermaking device comprises a paper machine pulp tank and a feeding device connected with the paper machine pulp tank, and the feeding device is used for adding dye; the production equipment also comprises a short fiber pulp tank connected with the first heat dispersion device and a long fiber pulp tank connected with the disc mill; the outlet of the short fiber pulp tank and the outlet of the long fiber pulp tank are both connected with the paper machine pulp tank;
the papermaking device of the paper machine also comprises a screen front screen, a head box, a screen part, a pressing part, a drying device, a sizing device, a rear drying part, a calendaring device and a crimping device which are arranged in sequence;
the production equipment also comprises a color online scanner for detecting the color of the single-layer kraft liner finished product;
the dye includes red dye and yellow dye, and the red dye and the yellow dye are added simultaneously.
3. The method for producing single-ply craft paper according to claim 1, wherein the slot-shaped screen plate of the classifying screen device has a slot width of 0.2mm, and the pulp with particles larger than 0.2mm is used as long fiber pulp and the pulp with particles smaller than 0.2mm is used as short fiber pulp.
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| CN111636230B (en) * | 2020-06-03 | 2022-07-01 | 玖龙纸业（东莞）有限公司 | Wood fiber and fine screening tailings mixed pulping treatment system and method |
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| CN102493261B (en) * | 2011-12-30 | 2015-04-15 | 东莞玖龙纸业有限公司 | Production method of kraft cardboard with ultra low gram weight |
| CN105019296A (en) * | 2014-04-22 | 2015-11-04 | 玖龙纸业(天津)有限公司 | Earthworm recycled paper material and preparation method of earthworm recycled paper |
| CN106676966B (en) * | 2016-07-26 | 2017-10-31 | 联盛纸业（龙海）有限公司 | A kind of paper sizing dyeing production and device |
| CN108239890A (en) * | 2016-12-26 | 2018-07-03 | 富阳市金昌纸业有限公司 | A kind of compounding method and production technology of top grade craft paper |
| CN107254797B (en) * | 2017-08-08 | 2019-02-05 | 山西强伟纸业有限公司 | The production technology of paper and lower paper on a kind of protecting paper of gypsum board |
| CN108035199A (en) * | 2017-12-11 | 2018-05-15 | 福建省联盛纸业有限责任公司 | A kind of craft paper and preparation method thereof |
| CN108396584B (en) * | 2018-02-27 | 2020-11-20 | 日照华泰纸业有限公司 | Production process of high-gloss original pulp black paperboard |
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