CN113944062A - Production method for eliminating lotus leaf edges of paper tube base paper - Google Patents
Production method for eliminating lotus leaf edges of paper tube base paper Download PDFInfo
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
- D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
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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
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
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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
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/06—Long fibres, i.e. fibres exceeding the upper length limit of conventional paper-making fibres; Filaments
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Abstract
The invention discloses a production method for eliminating the lotus leaf edge of paper tube base paper, which comprises the process flows of pulping, approach-feeding, net surfing, paper making and the like. The production method of the invention can overcome the defect that the forming net and the blanket must be thoroughly brushed or the beating degree is reduced by stopping the machine for a short time in the prior art, can ensure continuous production, thoroughly solves the problem of the lotus leaf edge of the high-grade paper tube base paper, and improves the production quality and the production efficiency of the paper tube base paper.
Description
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to a production method for eliminating lotus leaf edges of paper tube base paper.
Background
In the production process of the paper tube base paper, different raw materials are mixed and beaten, a paper sheet absorbs water and extends, fiber tissues of all parts are unbalanced, so that the moisture absorption is not uniform, the extension of the edge of the paper sheet is larger than that of the inside of the paper sheet, so that the change proportion of all parts of the paper sheet is inconsistent, and after a paper roll is taken off a machine, the edge, particularly the longitudinal edge of the paper sheet loses a proper straight state and is in a bending state which is not in the same plane with the paper surface, namely a lotus leaf edge. At paper tube body paper reelpipe in-process, the body paper divides the strip to narrow the back, and the lotus leaf limit phenomenon is more outstanding, because the paper is uneven, at branch strip body paper rubberizing in-process, can form local lack of glue, and the paper tube that causes to roll up produces layering and space, and the bonding is bad, and it is poor to become tub compressive property, and the paper tube can burst in the use when serious, causes bodily injury and equipment damage, reduces production efficiency simultaneously, increases extravagantly.
At present, paper tube base paper and other paperboard manufacturers have more or less lotus leaf edges, in order to treat the lotus leaf edges, the common practice in the industry is to thoroughly scrub a forming net and a blanket or reduce the beating degree during pulping, but the treatment method has unsatisfactory effect, influences the production efficiency and product indexes, cannot fundamentally solve the lotus leaf edge phenomenon, and the lotus leaf edges become the difficult problem in the paper tube base paper industry.
Disclosure of Invention
The invention provides a production method for eliminating the lotus leaf edges of high-grade paper tube base paper, aiming at solving the problem that the lotus leaf edge phenomenon cannot be fundamentally solved in the prior art, and the production method can overcome the defect that a forming net and a blanket must be thoroughly scrubbed or the beating degree of grinding is reduced in the prior art, improve the stability of sizing material on-line, ensure continuous production and product indexes, improve the longitudinal and transverse quantitative stability of finished paper, thoroughly eliminate the lotus leaf edge problem of the high-grade paper tube base paper, improve the product quality and the production efficiency, and improve the using effect of users.
In order to solve the technical problems, the invention adopts the following technical scheme:
a production method for eliminating lotus leaf edges of paper tube base paper comprises the following steps:
a. pulping: the method comprises the following steps of (1) pulping by using a hydrapulper by using waste boxboard as a raw material, wherein the concentration of the pulped pulp is 4.0-4.5%, and after the pulp is pulped, screening and purifying the pulp by a high-concentration sand remover, a coarse screen and a medium-concentration sand remover respectively to obtain good pulp;
the fine pulp enters a fiber grading sieve to separate long fibers and short fibers, the separated long fibers and short fibers respectively enter respective thickeners to be concentrated, and the concentrated long fibers and short fibers respectively enter respective double disc mills to be pulped;
after pulping, respectively feeding the long fibers and the short fibers into respective after-beating pools for storage, then taking the long fibers and the short fibers from the after-beating pools of the long fibers and the after-beating pools of the short fibers for pulp preparation according to a certain proportion, adjusting the concentration of the pulp to 4.0 percent after pulp preparation, feeding the pulp into a pulp forming pool, and pumping the pulp into a paper machine fore-making pool after the concentration of the pulp is adjusted to 3.0 to 3.2 percent from the pulp forming pool;
b. streaming and surfing the Internet: the slurry in the fore-making pool is simultaneously sent to a surface slurry pump, a lining slurry pump and a bottom slurry pump by a variable frequency slurry pump, and polyaluminium chloride is added in front of the surface slurry pump, the lining slurry pump and the bottom slurry pump, so as to carry out internal sizing on the slurry;
the sizing agent and the thick white water in the white water groove enter a fan pump for fan sizing and dilution, and then are sent to a surface pressure screen, a lining pressure screen and a bottom pressure screen, and the screened sizing agent enters a head box;
c. papermaking: the surface, lining and bottom three-layer papermaking adopts pulp entering a head box to carry out pulp hanging, and the pulp hanging proportion of the surface, lining and bottom three layers is respectively 30%, 30% and 40%;
the surface, the lining and the bottom are combined after three layers of paper making and pulp hanging;
the pulp suspension liquid is uniformly distributed on a forming wire along the cross web of the paper machine through a pulp flowing box, a wet paper web is formed after preliminary dehydration, and pulp baffles are arranged on two sides of a lip plate of the pulp flowing box so as to quantitatively keep the edge of the paper web at a preset value;
the wet paper web is compounded with the lining layer and then the bottom layer, starch solution is added in a multi-spraying mode before the paper web is compounded, and the compounded wet paper web is continuously dewatered by a vacuum box and a vacuum couch roll until the dryness is 20 percent and then enters a pressing part;
the squeezing part sequentially adopts the forms of vacuum prepressing, composite squeezing and two positive pressures to further dehydrate the wet paper web, and the dryness of the wet paper web is 52-55% when the wet paper web exits the squeezing part;
the dryness of the wet paper web is 91-93% after the wet paper web is dried in the drying part;
and (4) putting the dried paper sheets into a calender for calendering, reeling, rewinding and packaging to obtain the paper tube base paper.
Preferably, the separation ratio of long fibers to short fibers in the step a is 55: 45.
preferably, the long fiber double-disc mill in the step a uses 36-inch grinding discs, the model of the grinding discs is 36TF240/241, and the beating strength is about 1.0-1.2J/m; the short fiber double disc mill uses 36 inch mill plates with the model of 36TFU310/311 and the beating strength of about 0.4-0.6J/m.
Preferably, in the step a: the long fiber adopts semi-free and semi-sticky beating, the beating degree is controlled, and the fiber has certain devillicate fibrillation, the grinding concentration of the long fiber is 4.4-4.6%, the beating degree is controlled at 50 +/-1 DEG SR, and the water retention value of the paper pulp is controlled at 160-; the short fiber is beaten in sticky shape, the fiber is beaten in devillicate, the concentration of the short fiber is 6.2-6.4%, the beating degree is controlled at 42 +/-1 DEG SR, and the water retention value of the paper pulp is controlled at 175%.
Preferably, the pulp mixing ratio of the long fibers to the short fibers in the step a is 60-65: 35-40.
Preferably, the polyaluminium chloride is added in the step b in an amount of 0.5-1.0 kg/ton of paper, and the concentration of the pulp in the white water tank is diluted to 0.7% -1.0%.
Preferably, in step c, the paste dot 2/3 is on the forming plate of the forming wire, 1/3 is on the leading portion of the forming plate of the forming wire; the ratio of the slurry velocity to the forming wire velocity was controlled to 0.95. + -. 0.02.
Preferably, the two positive pressures in step c include: the wet paper web is subjected to vacuum preloading, composite squeezing, large roller first squeezing and large roller second squeezing in sequence, and the linear pressures of the vacuum preloading, the composite squeezing, the large roller first squeezing and the large roller second squeezing are respectively 80kN/m, 120kN/m, 200kN/m and 250 kN/m.
Preferably, the tension of the drying net in the drying part in the step c is 35-40N/cm; the drying part is provided with 8 groups of drying cylinders, the highest temperature of the drying cylinder of the 1 st group is not more than 80 ℃, the drying temperature of the drying cylinders of the 2-8 groups is gradually increased to 110 ℃ plus 105 ℃, the tail section of the drying cylinder of the 8 th group is provided with 2 cooling cylinders, the temperature is not more than 40 ℃, and the dryness of the paper web discharged from the drying part is 91-93%.
Preferably, the pressure of the air tire of the press machine in the step c is 0.1-0.3 MPa.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention thoroughly solves the technical problem of the lotus leaf edge of the paper tube base paper by optimizing key production equipment and production process in the production process, optimizing the proportion of long and short fibers in the raw materials and combining the reconstruction and resetting of equipment and process parameters in the process, improves the production quality of the paper tube base paper and ensures the production continuity.
(2) The production method of the invention can overcome the defect that the forming net and the blanket must be thoroughly brushed or the beating degree is reduced by stopping the machine for a short time in the prior art, can ensure continuous production, thoroughly solves the problem of the lotus leaf edge of the high-grade paper tube base paper, and improves the production quality and the production efficiency of the paper tube base paper.
Detailed Description
In order to make the technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following specific embodiments.
Example 1
Production method of F700-grade paper tube base paper
a. Pulping: adopting domestic waste paper as raw material, pulping by using a hydrapulper, wherein the pulping concentration is 3.5-4.5%, and respectively processing by a high-concentration slag separator, a coarse screen and a medium-concentration slag separator after pulping to prepare fine pulp;
the fine pulp enters a fiber grading sieve to separate long fibers and short fibers, the separated long fibers and short fibers respectively enter respective thickeners to be concentrated, and the long fibers and short fibers are concentrated and then respectively enter respective double disc mills to be pulped;
the long fiber is beaten in a semi-free state and a semi-sticky state, the beating degree is required to be controlled, the fiber is required to have certain fibrillation, the grinding concentration of the long fiber is 4.4 +/-0.1 percent, the beating degree is controlled at 50 +/-1 DEG SR, and the water retention value of the paper pulp is controlled at 160-; the short fibers are ground into pulp in a sticky shape, the fibers are subjected to devillicate fibrillation by weight, the grinding concentration of the short fibers is 6.2 +/-0.1 percent, the beating degree is controlled at 42 +/-1 DEG SR, and the water retention value of the paper pulp is controlled at 175 percent;
the beaten long fiber and short fiber respectively enter respective knocking pond to store pulp, and then are taken out from the knocking pond of the long fiber and the knocking pond of the short fiber, and the long fiber and the short fiber are 60: 40, adjusting the concentration to 3.0-3.2% after pulp preparation, and pumping to a paper machine fore-vat.
b. Streaming and surfing the Internet: the pulp of the forebay is sent to the face fan pump, the lining fan pump, the bottom fan pump at the same time by the frequency conversion fan pump, and the polyaluminium chloride is added in the front pipeline of the face fan pump, the lining fan pump, the bottom fan pump, the pulp is applied with glue internally, the adding amount of the polyaluminium chloride is 0.8 kg/ton paper;
the sizing agent and the thick white water in the white water groove enter a fan pump for fan washing and dilution, the concentration of the sizing agent is diluted to 0.7-0.9%, and then the sizing agent is sent to a surface pressure screen, a lining pressure screen and a bottom pressure screen, and the screened sizing agent enters a head box;
the paste landing point 2/3 is on the forming plate of the forming wire, 1/3 is on the leading portion of the forming plate of the forming wire; the ratio of the slurry velocity to the forming wire velocity was controlled to 0.95. + -. 0.02.
c. Papermaking: the surface, lining and bottom three-layer papermaking adopts pulp entering a head box to carry out pulp hanging, and the pulp hanging proportion of the surface, lining and bottom three layers is respectively 30%, 30% and 40%; the surface, the lining and the bottom are combined after three layers of paper making and pulp hanging;
the pulp suspension liquid is uniformly distributed on the forming wire along the paper machine cross web through the pulp flowing box, a wet paper web is formed after preliminary dehydration, and the pulp baffles are arranged on two sides of the pulp flowing box lip plate to prevent the paper web edge from being too low in basis weight;
the wet paper web is compounded with the lining layer and then the bottom layer, starch solution is added in a spraying method before the paper web is compounded, and the compounded wet paper web enters a squeezing part after being continuously dewatered to the dryness of 20 percent through a vacuum box and a vacuum couch roll;
the press portion adopts the form of vacuum pre-compaction, compound pressure and twice malleation in proper order, further dewaters wet paper web, and twice malleation includes: the wet paper web is subjected to vacuum preloading, composite squeezing, large roller first squeezing and large roller second squeezing in sequence, the linear pressures of the vacuum preloading, the composite squeezing, the large roller first squeezing and the large roller second squeezing are respectively 80kN/m, 120kN/m, 200kN/m and 250kN/m, and the dryness of the wet paper web can reach about 52-55% when the wet paper web is taken out of a squeezing part;
the temperature of the 1 st group of drying cylinders is respectively 50 ℃, 55 ℃, 58 ℃, 62 ℃, 65 ℃, 70 ℃, 74 ℃ and 77 ℃, the dryness of the paper web after drying in the drying part is 91-93%, the tension of a dry net is 35-40N/cm, the drying temperature of the 2-8 groups of drying cylinders is gradually increased, the temperature is up to 105-110 ℃, the temperature of the 8 th group of cooling cylinders is 40 ℃ and 36 ℃, the dried paper sheet enters a calender for calendering, the pressure of a calender pneumatic tire is 0.1-0.2MPa, and the paper tube base paper is prepared after reeling, rewinding and packaging.
Example 2
Production method of F800-grade paper tube base paper
a. Pulping: adopting domestic waste paper as raw material, pulping by using a hydrapulper, wherein the pulping concentration is 3.5-4.5%, and respectively processing by a high-concentration slag separator, a coarse screen and a medium-concentration slag separator after pulping to prepare fine pulp;
the fine pulp enters a fiber grading sieve to separate long fibers and short fibers, the separated long fibers and short fibers respectively enter respective thickeners to be concentrated, and the long fibers and short fibers are concentrated and then respectively enter respective double disc mills to be pulped;
the long fiber is beaten in a semi-free state and a semi-sticky state, the beating degree is required to be controlled, the fiber is required to have certain fibrillation, the grinding concentration of the long fiber is 4.6 +/-0.1 percent, the beating degree is controlled at 50 +/-1 DEG SR, and the water retention value of the paper pulp is controlled at 160-; the short fibers are ground into pulp in a sticky shape, the fibers are subjected to devillicate fibrillation by weight, the grinding concentration of the short fibers is 6.4 +/-0.1 percent, the beating degree is controlled at 42 +/-1 DEG SR, and the water retention value of the paper pulp is controlled at 175 percent;
the beaten long fiber and short fiber respectively enter respective knocking pond to store pulp, and then are taken out from the knocking pond of the long fiber and the knocking pond of the short fiber, and the long fiber and the short fiber are in a proportion of 65:35, adjusting the concentration to 3.0-3.2% after pulp preparation, and pumping to a paper machine fore-vat.
b. Streaming and surfing the Internet: the pulp of the forebay is sent to the face fan pump, the lining fan pump, the bottom fan pump at the same time by the frequency conversion fan pump, and the polyaluminium chloride is added in the front pipeline of the face fan pump, the lining fan pump, the bottom fan pump, the pulp is applied with glue internally, the adding amount of the polyaluminium chloride is 0.5 kg/ton paper;
the sizing agent and the thick white water in the white water groove enter a fan pump for fan washing and dilution, the concentration of the sizing agent is diluted to 0.8-1.0%, then the sizing agent is sent to a surface pressure screen, a lining pressure screen and a bottom pressure screen, and the screened sizing agent enters a head box;
the paste landing point 2/3 is on the forming plate of the forming wire, 1/3 is on the leading portion of the forming plate of the forming wire; the ratio of the slurry velocity to the forming wire velocity was controlled to 0.95. + -. 0.02.
c. Papermaking: the surface, lining and bottom three-layer papermaking adopts pulp entering a head box to carry out pulp hanging, and the pulp hanging proportion of the surface, lining and bottom three layers is respectively 30%, 30% and 40%; the surface, the lining and the bottom are combined after three layers of paper making and pulp hanging;
the pulp suspension liquid is uniformly distributed on the forming wire along the paper machine cross web through the pulp flowing box, a wet paper web is formed after preliminary dehydration, and the pulp baffles are arranged on two sides of the pulp flowing box lip plate to prevent the paper web edge from being too low in basis weight;
the wet paper web is compounded with the lining layer and then the bottom layer, starch solution is added in a spraying method before the paper web is compounded, and the compounded wet paper web enters a squeezing part after being continuously dewatered to the dryness of 20 percent through a vacuum box and a vacuum couch roll;
the press portion adopts the form of vacuum pre-compaction, compound pressure and twice malleation in proper order, further dewaters wet paper web, and twice malleation includes: the wet paper web is subjected to vacuum preloading, composite squeezing, large roller first squeezing and large roller second squeezing in sequence, the linear pressures of the vacuum preloading, the composite squeezing, the large roller first squeezing and the large roller second squeezing are respectively 80kN/m, 120kN/m, 200kN/m and 250kN/m, and the dryness of the wet paper web can reach about 52-55% when the wet paper web is taken out of a squeezing part;
the temperature of the 1 st group of drying cylinders is respectively 50 ℃, 55 ℃, 58 ℃, 62 ℃, 65 ℃, 70 ℃, 74 ℃ and 77 ℃, the dryness of the paper web after drying in the drying part is 91-93%, the tension of a dry net is 35-40N/cm, the drying temperature of the 2-8 groups of drying cylinders is gradually increased, the temperature is up to 105-110 ℃, the temperature of the 8 th group of cooling cylinders is 39 ℃ and 35 ℃, the dried paper sheet enters a calender for calendering, the pressure of a calender pneumatic tire is 0.2-0.3MPa, and the paper tube base paper is prepared after reeling, rewinding and packaging.
EXAMPLE 3
Production method of F700-grade paper tube base paper
a. Pulping: adopting domestic waste paper as raw material, pulping by using a hydrapulper, wherein the pulping concentration is 3.5-4.5%, and respectively processing by a high-concentration slag separator, a coarse screen and a medium-concentration slag separator after pulping to prepare fine pulp;
the fine pulp enters a fiber grading sieve to separate long fibers and short fibers, the separated long fibers and short fibers respectively enter respective thickeners to be concentrated, and the long fibers and short fibers are concentrated and then respectively enter respective double disc mills to be pulped;
the long fiber is beaten in a semi-free state and a semi-sticky state, the beating degree is required to be controlled, the fiber is required to have certain fibrillation, the grinding concentration of the long fiber is 4.4 +/-0.1 percent, the beating degree is controlled at 50 +/-1 DEG SR, and the water retention value of the paper pulp is controlled at 160-; the short fibers are ground into pulp in a sticky shape, the fibers are subjected to devillicate fibrillation by weight, the grinding concentration of the short fibers is 6.2 +/-0.1 percent, the beating degree is controlled at 42 +/-1 DEG SR, and the water retention value of the paper pulp is controlled at 175 percent;
the beaten long fiber and short fiber respectively enter respective knocking pond to store pulp, and then are taken out from the knocking pond of the long fiber and the knocking pond of the short fiber, and the long fiber and the short fiber are in a proportion of 65: 40, adjusting the concentration to 3.0-3.2% after pulp preparation, and pumping to a paper machine fore-vat.
b. Streaming and surfing the Internet: the pulp of the forebay is sent to the face fan pump, the lining fan pump, the bottom fan pump at the same time by the frequency conversion fan pump, and the polyaluminium chloride is added in the front pipeline of the face fan pump, the lining fan pump, the bottom fan pump, the pulp is applied with glue internally, the adding amount of the polyaluminium chloride is 1.0 kg/ton paper;
the sizing agent and the thick white water in the white water groove enter a fan pump for fan washing and dilution, the concentration of the sizing agent is diluted to 0.7-0.9%, and then the sizing agent is sent to a surface pressure screen, a lining pressure screen and a bottom pressure screen, and the screened sizing agent enters a head box;
the paste landing point 2/3 is on the forming plate of the forming wire, 1/3 is on the leading portion of the forming plate of the forming wire; the ratio of the slurry velocity to the forming wire velocity was controlled to 0.95. + -. 0.02.
c. Papermaking: the surface, lining and bottom three-layer papermaking adopts pulp entering a head box to carry out pulp hanging, and the pulp hanging proportion of the surface, lining and bottom three layers is respectively 30%, 30% and 40%; the surface, the lining and the bottom are combined after three layers of paper making and pulp hanging;
the pulp suspension liquid is uniformly distributed on the forming wire along the paper machine cross web through the pulp flowing box, a wet paper web is formed after preliminary dehydration, and the pulp baffles are arranged on two sides of the pulp flowing box lip plate to prevent the paper web edge from being too low in basis weight;
the wet paper web is compounded with the lining layer and then the bottom layer, starch solution is added in a spraying method before the paper web is compounded, and the compounded wet paper web enters a squeezing part after being continuously dewatered to the dryness of 20 percent through a vacuum box and a vacuum couch roll;
the press portion adopts the form of vacuum pre-compaction, compound pressure and twice malleation in proper order, further dewaters wet paper web, and twice malleation includes: the wet paper web is subjected to vacuum preloading, composite squeezing, large roller first squeezing and large roller second squeezing in sequence, the linear pressures of the vacuum preloading, the composite squeezing, the large roller first squeezing and the large roller second squeezing are respectively 80kN/m, 120kN/m, 200kN/m and 250kN/m, and the dryness of the wet paper web can reach about 52-55% when the wet paper web is taken out of a squeezing part;
the temperature of the 1 st group of drying cylinders is respectively 50 ℃, 55 ℃, 58 ℃, 62 ℃, 65 ℃, 70 ℃, 74 ℃ and 77 ℃, the dryness of the paper web after drying in the drying part is 91-93%, the tension of a dry net is 35-40N/cm, the drying temperature of the 2-8 groups of drying cylinders is gradually increased, the temperature is up to 105-110 ℃, the temperature of the 8 th group of cooling cylinders is 37 ℃ and 35 ℃, the dried paper sheet enters a calender for calendering, the pressure of a calender pneumatic tire is 0.1-0.2MPa, and the paper tube base paper is prepared after reeling, rewinding and packaging.
It should be understood that the detailed description and specific examples, while indicating the invention, are given by way of illustration only, since various other embodiments will become apparent to those skilled in the art upon reference to the following detailed description.
Claims (10)
1. A production method for eliminating lotus leaf edges of paper tube base paper is characterized by comprising the following steps:
a. pulping: the method comprises the following steps of (1) pulping by using a hydrapulper by using waste boxboard as a raw material, wherein the concentration of the pulped pulp is 4.0-4.5%, and after the pulp is pulped, screening and purifying the pulp by a high-concentration sand remover, a coarse screen and a medium-concentration sand remover respectively to obtain good pulp;
the fine pulp enters a fiber grading sieve to separate long fibers and short fibers, the separated long fibers and short fibers respectively enter respective thickeners to be concentrated, and the long fibers and short fibers are concentrated and then respectively enter respective double disc mills to be pulped;
the beaten long fiber and short fiber respectively enter respective knocking pools to store pulp, then the long fiber and short fiber are taken out from the knocking pools of the long fiber and the knocking pools of the short fiber, the long fiber and the short fiber are mixed according to a certain proportion, the pulp concentration is adjusted to 4.0 percent after the pulp is mixed and enters a pulp forming pool, the pulp concentration is adjusted to 3.0 to 3.2 percent from the pulp forming pool, and the pulp is pumped to a paper machine front pool;
b. streaming and surfing the Internet: the slurry in the fore-making pool is simultaneously sent to a surface slurry pump, a lining slurry pump and a bottom slurry pump by a variable frequency slurry pump, and polyaluminium chloride is added in front of the surface slurry pump, the lining slurry pump and the bottom slurry pump, so as to carry out internal sizing on the slurry;
the sizing agent and the thick white water in the white water groove enter a fan pump for fan sizing and dilution, and then are sent to a surface pressure screen, a lining pressure screen and a bottom pressure screen, and the screened sizing agent enters a head box;
c. papermaking: the surface, lining and bottom three-layer papermaking adopts pulp entering a head box to carry out pulp hanging, and the pulp hanging proportion of the surface, lining and bottom three layers is respectively 30%, 30% and 40%;
the surface, the lining and the bottom are combined after three layers of paper making and pulp hanging;
the pulp suspension liquid is uniformly distributed on a forming wire along the cross web of the paper machine through a pulp flowing box, a wet paper web is formed after preliminary dehydration, and pulp baffles are arranged on two sides of a lip plate of the pulp flowing box so as to quantitatively keep the edge of the paper web at a preset value;
the wet paper web is compounded with the lining layer and then the bottom layer, starch solution is added in a multi-spraying mode before the paper web is compounded, and the compounded wet paper web enters a squeezing part after being continuously dewatered to the dryness of 20% by a vacuum box and a vacuum couch roll;
the squeezing part sequentially adopts the forms of vacuum prepressing, composite squeezing and two positive pressures to further dehydrate the wet paper web, and the dryness of the wet paper web is 52-55% when the wet paper web exits the squeezing part;
the dryness of the wet paper web is 91-93% after the wet paper web is dried in the drying part;
and (4) putting the dried paper sheets into a calender for calendering, reeling, rewinding and packaging to obtain the paper tube base paper.
2. The production method for eliminating the scalloped edge of the paper tube base paper as claimed in claim 1, wherein the separation ratio of long fiber to short fiber in the step a is 55: 45.
3. the production method for eliminating the scalloped edge of the paper tube base paper as claimed in claim 2, wherein the long fiber double disc grinder in the step a uses a 36-inch grinding disc with the model of 36TF240/241 and the beating strength of about 1.0-1.2J/m; the short fiber double disc mill uses 36 inch mill plates with the model of 36TFU310/311 and the beating strength of about 0.4-0.6J/m.
4. The production method for eliminating the lotus leaf edges of the paper tube base paper as claimed in claim 3, wherein in the step a: the long fiber is beaten in a semi-free state and a semi-sticky state, the concentration of the long fiber is 4.4 to 4.6 percent, the beating degree is controlled at 50 +/-1 DEG SR, and the water retention value of the paper pulp is controlled at 160 plus and minus 165 percent; the short fiber is beaten in a sticky shape, the pulping concentration of the short fiber is 6.2-6.4%, the pulping degree is controlled at 42 +/-1 DEG SR, and the water retention value of the paper pulp is controlled at 175%.
5. The production method for eliminating the scalloped edge of the paper tube base paper as claimed in any one of claims 1 to 4, wherein the pulp mixing ratio of the long fibers to the short fibers in the step a is 60-65: 35-40.
6. The method as claimed in claim 1, wherein the polyaluminium chloride is added in an amount of 0.5-1.0 kg/ton of paper in step b, and the concentration of the pulp in the white water tank is diluted to 0.7% -1.0%.
7. The method for producing the raw paper for paper tube with the elimination of the scalloping edge as claimed in claim 6, wherein the pulp printing point 2/3 is on the forming plate of the forming wire in the step b, and 1/3 is on the leading part of the forming plate of the forming wire; the ratio of the slurry velocity to the forming wire velocity was controlled to 0.95. + -. 0.02.
8. The method as claimed in claim 7, wherein the two positive pressures in step c comprise: the wet paper web is subjected to vacuum preloading, composite squeezing, large roller first squeezing and large roller second squeezing in sequence, and the linear pressures of the vacuum preloading, the composite squeezing, the large roller first squeezing and the large roller second squeezing are respectively 80kN/m, 120kN/m, 200kN/m and 250 kN/m.
9. The production method for eliminating the lotus leaf edges of the paper tube base paper as claimed in claim 8, wherein the tension of the drying part drying net in the step c is 35-40N/cm; the drying part is provided with 8 groups of drying cylinders, the highest temperature of the drying cylinder of the 1 st group is not more than 80 ℃, the drying temperature of the drying cylinders of the 2-8 groups is gradually increased to 110 ℃ plus 105 ℃, the tail section of the drying cylinder of the 8 th group is provided with 2 cooling cylinders, the temperature of the cooling cylinders is not more than 40 ℃, and the dryness of the paper web discharged from the drying part is 91-93%.
10. The production method for eliminating the lotus leaf edges of the paper tube base paper as claimed in claim 1, wherein the air pressure of the air tire of the press machine in the step c is 0.1-0.3 MPa.
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