CN112853792B

CN112853792B - Pulp blending process technology

Info

Publication number: CN112853792B
Application number: CN202011619755.1A
Authority: CN
Inventors: 刘轩; 潘晓锋
Original assignee: Hunan Hengan Household Paper Co ltd; Hengan China Paper Industry Co Ltd
Current assignee: Hunan Hengan Household Paper Co ltd; Hengan China Paper Industry Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2022-07-05
Anticipated expiration: 2040-12-31
Also published as: CN112853792A

Abstract

The invention relates to the field of papermaking, in particular to a paper pulp mixing flow process, which comprises the following steps: firstly, long fiber materials enter a pulper for pulping, then long fibers are output to a long fiber discharging tower, and broken paper pulp of a paper machine is output to a short fiber discharging tower; secondly, the long fibers stay in a long fiber discharging tower and then sequentially enter a first pulping machine and a second pulping machine, and then are respectively output to a carpet layer pulp distribution pool and a net layer pulp distribution pool; thirdly, the short fibers stay in a short fiber discharging tower and then enter a fourth pulping machine, and the short fibers are output to a blanket layer pulp blending pool and a net layer pulp blending pool; fourthly, outputting the mixed short fibers and long fibers to a third pulping machine through a carpet layer pulp blending pool, outputting the mixed short fibers and long fibers to a carpet layer paper machine pulp pool, entering a carpet layer removing fan pump and outputting the mixed short fibers and long fibers; and fifthly, outputting the mixed short fibers and long fibers to a pulp tank of a mesh layer paper machine after the mesh layer pulp tank is mixed with the short fibers and the long fibers, and then entering a mesh layer-removing fan pump and outputting. Which solves the problem of overhigh energy consumption in the pulp blending process flow of the paper pulp.

Description

Pulp blending process technology

Technical Field

The invention relates to the field of papermaking, in particular to a pulp blending process technology.

Background

At present, high-grade household paper is rapidly increased in the household paper market in China, and is a daily consumer product which is more and more popular in national consumption. But the production cost of domestic high-grade household paper is high, especially the energy cost. In order to reduce the energy consumption of high-grade paper products for daily use, a short-flow process of a high-grade paper pulp preparation workshop is developed in an established way, the flow links are shortened, and the energy consumption of the production process is reduced.

The short-flow process has the main characteristics of shortening the papermaking flow, reducing the retention swelling time of fibers in a system and having potential adverse effects on quality indexes such as softness, strength and the like of paper sheets. The influence of the flow caching time on the product quality and the production continuity is researched by the project, the defects of fiber swelling are overcome by means of adding swelling promoting chemicals, increasing the system temperature and the like, feasible short-flow process technology implementation means are developed, and a technical scheme is provided for realizing a short-flow process.

Specifically, the short-flow process means that unnecessary temporary storage points of the pulp are removed and the temporary storage time is shortened in the range from pulp board disintegration to a pulp pump of the paper machine in the pulp preparation system of the paper machine, so that the shortening of the pulp system is realized, and the repeated pumping and stirring of the pulp are reduced, thereby achieving the purpose of saving energy consumption and reducing fixed investment.

However, such reduction and shortening are not freely achievable, and it is necessary to consider properties such as longitudinal tension and bulk of the formed paper, and therefore the present applicant has made a lot of studies thereon.

Disclosure of Invention

Therefore, aiming at the problems, the invention provides a pulp blending process, which solves the problem of overhigh energy consumption in the existing pulp blending process.

In order to achieve the purpose, the invention adopts the following technical scheme: a pulp proportioning process comprises the following steps:

firstly, long fiber materials enter a pulper for pulping, then long fibers are output to a long fiber discharging tower, and broken paper pulp of a paper machine is output to a short fiber discharging tower;

secondly, after the long fibers stay in a long fiber discharging tower for 65-216min, the long fibers sequentially enter a first pulping machine and a second pulping machine and are respectively output to a carpet layer pulp distribution pool and a net layer pulp distribution pool;

thirdly, the short fibers stay in a short fiber discharging tower for 35-116min and then enter a fourth pulping machine, and are output to a carpet layer pulp blending pool and a net layer pulp blending pool;

fourthly, outputting the mixed short fibers and long fibers to a third pulping machine through a carpet layer pulp blending pool, outputting the mixed short fibers and long fibers to a carpet layer paper machine pulp pool, entering a carpet layer removing fan pump and outputting the mixed short fibers and long fibers;

and fifthly, outputting the mixed short fibers and long fibers to a pulp tank of a mesh layer paper machine after the mesh layer pulp tank is mixed with the short fibers and the long fibers, and then entering a mesh layer-removing fan pump and outputting.

Further, the ratio of the pulp output weight of the pulp pool of the blanket layer paper machine to the pulp pool of the net layer paper machine is 1: 1.

further, the ratio of the output content of the long fibers to the output content of the short fibers is 5-7: 3-5.

Further, the slurry residence time of the carpet layer slurry proportioning pool and the net layer slurry proportioning pool tends to be 0.

Further, the retention time of the pulp in the pulp tank of the blanket layer paper machine and the pulp tank of the net layer paper machine is 9-22 min.

Further, after the long fibers pass through a first pulping machine and a second pulping machine, the pulping concentration is 10%, the long fibers are diluted to 3% after pulping, mechanical stirring and water bath heating are carried out, and the temperature of the pulp is kept at 40 ℃.

Further, the power of the fourth refiner is 350 kw.

Further, 40 degrees of deionized water was added during pulping in the pulper.

Further, the fourth pulping machine comprises a frame, a feeding mechanism, a grinding disc mechanism and a transmission mechanism, wherein the feeding mechanism, the grinding disc mechanism and the transmission mechanism are arranged on the frame according to a production line, the feeding mechanism is communicated with the grinding disc mechanism through a material conveying pipeline, the transmission mechanism is in transmission connection with the grinding disc mechanism through a rotating shaft, the grinding disc mechanism comprises a shell, a fixed disc and a movable disc, the fixed disc and the movable disc are arranged on the shell, the rotating shaft extends into the shell, the movable disc is fixed on the end part of the rotating shaft extending into the shell, the fixed disc and the movable disc are both in a frustum-shaped structure, a gap for grinding is reserved between the fixed disc and the movable disc, a feeding port connected with the material conveying pipeline is arranged at the left end of the shell, a discharging port communicated with the gap is arranged at the lower end of the shell, the movable disc comprises a frustum-shaped seat body, and a plurality of grinding tool bits are uniformly distributed on the circumferential outer side surface of the seat body, each grinding tool bit is fixedly connected with the base body through a bolt.

Furthermore, an elastic sheet is clamped between the grinding tool bit and the seat body.

Further, the grinding tool bit covers the elastic sheet.

Furthermore, the left end of the movable disc stretches into the conveying pipeline, one end of the movable disc stretching into the conveying pipeline is arc-shaped, and a guide plate used for guiding materials is arranged on the end face of the arc-shaped end face.

Furthermore, a plurality of protruding ring bodies are arranged on the right end face of the movable disc, and grooves matched with the protruding ring bodies to achieve sealing are formed in the shell.

By adopting the technical scheme, the invention has the beneficial effects that: the scheme eliminates two beating rear pulp towers of the long/short fibers of the original scheme, reduces two pulp pumps and two stirrers, and the total power of the pulp pumps is about 52 kw. The short fiber fluffer is replaced by a fourth pulping machine. And (3) removing a broke pool, directly conveying broke pulp of the paper machine to a long fiber/short fiber discharging tower, reducing 1-2 pulp pools and pulp pumps in a broke line, and reducing the total power by about 30 kW. And removing one white water tower for cultivating at 250m and reducing the pumping of the white water once. The pressure tail screen of the flow system is removed. The clear water system/chemical system of the two paper machines is degenerate, and the number of water towers and chemical devices is reduced. The main difference between the method and the existing pulp preparation process is that the retention time of the pulp after refining is changed from 59-193min to 4-9min, so that the time cost and the energy cost are greatly saved, and the cost is effectively saved. And the use of pulping enzyme and softening agent can be effectively stopped, thereby effectively reducing the dosage of chemicals. Further, the ratio of the output weight of the pulp pool of the blanket layer paper machine to the output weight of the pulp pool of the net layer paper machine is 1: 1, the effect balance during the shaping can be effectively guaranteed, and the shaping effect is effectively improved. Further, the ratio of the output content of the long fibers to the output content of the short fibers is 5-7: 3-5, which is a more preferred ratio, can be 6.5:3.5, etc. Furthermore, the retention time of the pulp in the carpet layer pulp distribution pool and the mesh layer pulp distribution pool tends to 0, so that the retention time in the two devices is reduced, the quality of the formed paper is not greatly influenced, the forming efficiency can be effectively improved, and the cost is saved. The retention time of the pulp tank of the blanket layer paper machine and the pulp tank of the net layer paper machine is 9-22min, and the control of the retention time mainly aims to ensure the quality of the formed paper, form the paper with the optimal quality on the basis of reducing the time to the maximum extent and ensure the quality of the formed paper to be in a reasonable range. Furthermore, after the long fibers pass through the first pulping machine and the second pulping machine, the pulping concentration is 10%, the long fibers are diluted to 3% after pulping, mechanical stirring and water bath heating are carried out, the temperature of the pulp is kept at 40 ℃, and the purpose of the method is to play an effective positive effect on the moistening of the pulp and realize promotion of bulk and softness after paper forming. Furthermore, 40-degree deionized water is added during pulping of the pulper, and the aim is to promote the bulk and softness of the formed paper. Furthermore, through the arrangement of the fourth pulping machine, particularly the arrangement of the grinding disc mechanism, the grinding effect of the pulp can be better, the effect of the short fiber fluffer after replacement is effectively kept, and the formed paper achieves better bulk and softness. Wherein, the setting of flexure strip can effectively reduce and strike, is favorable to the effective of grinding going on. And the setting of guide plate can be so that thick liquids can effectively get into in the clearance after the pipeline input, and pipeline can adopt screw conveyor to realize the pay-off. When practical application, protruding ring body can adopt sealing rubber to replace, in time, between the right-hand member face of driving disk and the casing, as long as be provided with effectual sealing device can, like the skeleton seal etc..

Drawings

FIG. 1 is a schematic process flow diagram of the present invention;

FIG. 2 is a schematic view of a fourth refiner;

FIG. 3 is a schematic view of the arrangement of FIG. 2 showing the engagement of the deflector with the rotor;

fig. 4 is a schematic view of a grinding bit.

Detailed Description

The invention will now be further described with reference to the accompanying drawings and detailed description.

Referring to fig. 1, this embodiment provides a pulp proportioning process, which includes the following steps:

thirdly, the short fibers stay in a short fiber discharging tower for 35-116min and then enter a fourth pulping machine, and are output to a blanket layer pulp blending pool and a net layer pulp blending pool;

The ratio of the output weight of the pulp of the blanket layer paper machine pulp pool to the output weight of the pulp of the net layer paper machine pulp pool is 1: 1. the ratio of the output content of the long fibers to the output content of the short fibers is 5-7: 3-5, and can take 6.5: 3.5. The slurry residence time of the blanket layer slurry proportioning pool and the net layer slurry proportioning pool tends to be 0. The slurry retention time of the pulp pool of the blanket layer paper machine and the pulp pool of the net layer paper machine is 9-22 min. After the long fibers pass through a first pulping machine and a second pulping machine, the pulping concentration is 10 percent, the long fibers are diluted to 3 percent after pulping, mechanical stirring and water bath heating are carried out, and the temperature of the pulp is kept at 40 ℃. The power of the fourth pulping machine is 350kw, and the short fiber treatment is enhanced, so that the original defibering process is replaced. 40 degrees of deionized water was added during pulping in the pulper. Wherein the residence time in the pulper is typically 15 min.

The residence time of the pulp in each device is strictly controlled, so that better pulp forming quality can be achieved, and better physical performance of the formed paper can be realized.

Aiming at the pulp mixing flow process, the applicant carries out process tests in order to verify the effectiveness of the pulp mixing flow process. With the first product: 16g soft puff, second product: 15.3 Economy wound paper as test object, see Table 1:

table 116 g soft draw and 15.3 economical package web process

Wherein, the comparison of the conventional process with the liquid level lower than the pulp tower and the pulp tower to the short-flow process is shown in the table 2:

TABLE 2 pulp tower/pulp tower level conventional Process comparison short run test

Wherein, for a first product: 16g soft draw, conventional process during run and short run test residence time, see Table 3:

TABLE 316 g Soft-Spot test duration conventional Process and short run test residence time

After the formation of the base paper, the physical properties of the base paper were tested for different residence times, as shown in table 4:

TABLE 4 measurement of the physical Properties of the base papers at different residence times

From the above data, it can be seen that base papers with short stock retention times (short run) have a 8.9% lower and 3.7% lower grade tensile index and bulk, respectively, than those with longer retention times. Theoretically, the strength of the paper depends to some extent on the degree of swelling of the fibers, which is sufficient to expose more hydroxyl groups. The moistening and the tensioning are mainly performed on the fiber primary wall and in the pulping process, and the moistening and the tensioning effects are small under the condition that the squeezing and the cutting effects of a pulping machine are not generated. The test paper sample with short flow can still meet the quality requirement under the condition of not adding pulping enzyme and using amount of long fibers of 27.7 percent, so the pulp proportioning flow process is practical and feasible.

Referring to fig. 2 and 3 again, the fourth refiner includes a frame, a feeding mechanism, a millstone mechanism 2 and a transmission mechanism 3, wherein the feeding mechanism, the millstone mechanism 2 and the transmission mechanism 3 are arranged on the frame according to a production line, the feeding mechanism is communicated with the millstone mechanism 2 through a conveying pipeline 1, the transmission mechanism 3 is in transmission connection with the millstone mechanism 2 through a rotating shaft 31, the structure is a conventional structure in the field, and the structure can refer to the chinese patent application number: CN201620647235.4 discloses a cylindrical refiner, or other related refiners.

Grinding disc mechanism 2 includes casing 21 and locates fixed disk 22, driving disk 23 on casing 21, pivot 3 stretches into in the casing 21, driving disk 23 is fixed in on the tip of stretching into pivot 3 in the casing 21, fixed disk 22 all is frustum column structure with driving disk 23, there is the clearance 24 that is used for the mill refining between fixed disk 22 and the driving disk 23, the left end of casing 21 is equipped with the feed inlet 211 of being connected with conveying pipeline 1, be equipped with the discharge gate 212 of intercommunication clearance 24 on the casing 21 lower extreme, driving disk 23 includes the pedestal 231 of frustum column, evenly distributed ground is equipped with a plurality of grinding tool bits 232 on the circumference lateral surface of pedestal 231, and each grinding tool bit 232 passes through bolt 233 and pedestal 231 is fixed continuous. An elastic sheet 234 is clamped between the grinding cutter head 232 and the seat 231. The grinding bit 232 is covered with an elastic sheet 234. The left end of movable disk 23 stretches into in the conveying pipeline 1, the one end that movable disk 23 stretches into conveying pipeline 1 is arc, is equipped with the guide plate 235 that is used for realizing the material direction on the convex terminal surface. The right end face of the movable disc 23 is provided with a plurality of protruding ring bodies 236, and the shell 21 is provided with a groove 213 which is matched with the protruding ring bodies 236 to realize sealing. The right end of the movable disk 23 is inclined to form an inclined portion 237 near the discharge port, the inclined portion 237 is provided to facilitate the discharge of the slurry, and the inclined portion 237 forms a smaller space than the gap 24, and actually presses out the slurry during the rotation.

The plurality of grinding bits 232 on the movable disk can take different configurations, such as an angular progression, such as a convex height progression. And each grinding tool bit can be formed by combining a plurality of tool bits with different structures, such as three tool bits with different structures which are arranged side by side. Referring to fig. 4, this scheme provides a structural form of a grinding tool bit, which includes a first tool bit 91, a second tool bit 92 and a third tool bit 93 which are arranged on a tool bit mounting seat 90, the first tool bit 91, the second tool bit 92 and the third tool bit 93 are arranged at intervals along the circumference in sequence, wherein the protruding height of the first tool bit 91 is greater than that of the second tool bit 92, the protruding height of the second tool bit 92 is greater than that of the third tool bit 93, the first tool bit 91 and the second tool bit 92 are both sharp devices, the sharp angle of the second tool bit 92 is smaller than that of the first tool bit, the first tool bit 91, the second tool bit 92 and the third tool bit 93 form a first group of grinding structures, and a second group of grinding structures which includes a fourth tool bit 91a, a fifth tool bit 92a and a sixth tool bit 93a are arranged on the mounting seat 90 at intervals along the axial direction, and are offset from the first group of grinding structures along the circumferential direction, the dislocation angle should be less than 5 degrees, and the value of this scheme is 2 degrees. Correspondingly, more groups of grinding structures can be arranged, so that effective grinding is realized. The purpose of setting up like this is in order to realize more effective abundant grinding, can not have great impact to the grinding process of mechanism moreover, effectively improves thick liquids quality. Wherein the different arrangement of the sharp structures of the first, second and third cutting head aims at making the first cutting head 91 produce the main grinding force and thus its volume also the largest, while the second cutting head 92 aims at the most favourable destruction of the part, while the third cutting head 93 aims at achieving normal grinding and thus it is also flatter. The arrangement can effectively prolong the service life of the grinding tool bit, and can play a more effective slurry forming effect in the process flow after the mechanism is simplified.

The fourth refiner may also be an existing conventional refiner, and the first refiner, the second refiner and the third refiner may have the same or similar structure as the fourth refiner. Through the setting of fourth fiberizer, especially the setting of mill mechanism, can be so that the grinding effect of thick liquids is better, effectively realize keeping the effect after the short fiber fluffer replacement, realize that the paper after the shaping reaches better bulk, compliance. Wherein, the setting of flexure strip can effectively reduce and strike, is favorable to the effective of grinding going on. And the arrangement of the guide plate can ensure that slurry can effectively enter the gap after being input by the conveying pipeline, and the conveying pipeline can adopt a spiral conveying device to realize feeding. When practical application, protruding ring body can adopt sealing rubber to replace, in time, between the right-hand member face of driving disk and the casing, as long as be provided with effectual sealing device can, like the skeleton seal etc..

The beneficial effects of the invention are:

the scheme eliminates two beating rear pulp towers of the long/short fibers of the original scheme, reduces two pulp pumps and two stirrers, and the total power of the pulp pumps is about 52 kw. The short fiber fluffer is replaced by a fourth pulping machine. And (3) removing a broke tank, directly conveying broke paper pulp of the paper machine to a long fiber/short fiber discharge tower, reducing 1-2 pulp tanks and pulp pumps of a broke line, and reducing the total power by about 30 kW. And removing one white water tower for carrying out the dry harvest at the speed of 250m, and reducing the pumping time of the white water. The pressure tail screen of the flow system is removed. The clear water system/chemical system of the two paper machines is degenerated, and the number of water towers and chemical devices is reduced. The main difference between the method and the existing pulp preparation process is that the retention time of the pulp after refining is changed from 59-193min to 4-9min, so that the time cost and the energy cost are greatly saved, and the cost is effectively saved. Further, the ratio of the output weight of the pulp pool of the blanket layer paper machine to the output weight of the pulp pool of the net layer paper machine is 1: 1, the effect balance during the shaping can be effectively guaranteed, and the shaping effect is effectively improved. Further, the ratio of the output content of the long fibers to the output content of the short fibers is 5-7: 3-5, which is a more preferred ratio, can be 6.5:3.5, etc. Furthermore, the retention time of the pulp in the carpet layer pulp distribution pool and the mesh layer pulp distribution pool tends to 0, so that the retention time in the two devices is reduced, the quality of the formed paper is not greatly influenced, the forming efficiency can be effectively improved, and the cost is saved. The retention time of the pulp tank of the blanket layer paper machine and the pulp tank of the net layer paper machine is 9-22min, and the control of the retention time mainly aims to ensure the quality of the formed paper, form the paper with the optimal quality on the basis of reducing the time to the maximum extent and ensure the quality of the formed paper to be in a reasonable range. Furthermore, after the long fibers pass through the first pulping machine and the second pulping machine, the pulping concentration is 10%, the long fibers are diluted to 3% after pulping, mechanical stirring and water bath heating are carried out, the temperature of the pulp is kept at 40 ℃, and the purpose of the method is to play an effective positive effect on the moistening of the pulp and realize promotion of bulk and softness after paper forming. Furthermore, 40-degree deionized water is added during pulping of the pulper, and the aim is to promote the bulk and softness of the formed paper.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A pulp proportioning process technology is characterized by comprising the following steps:

thirdly, short fibers enter a fourth pulping machine after staying for 35-116min in a short fiber discharging tower and are output to a carpet layer pulp distribution tank and a net layer pulp distribution tank, the fourth pulping machine comprises a rack, a feeding mechanism, a grinding disc mechanism and a transmission mechanism, the feeding mechanism, the grinding disc mechanism and the transmission mechanism are arranged on the rack according to a production line, the feeding mechanism is communicated with the grinding disc mechanism through a material conveying pipeline, the transmission mechanism is in transmission connection with the grinding disc mechanism through a rotating shaft, the grinding disc mechanism comprises a shell, a fixed disc and a movable disc, the fixed disc and the movable disc are arranged on the shell, the rotating shaft extends into the shell, the movable disc is fixed on the end part of the rotating shaft extending into the shell, the fixed disc and the movable disc are both in frustum-shaped structures, a gap for pulping is reserved between the fixed disc and the movable disc, a feeding hole connected with the material conveying pipeline is arranged at the left end of the shell, and a discharging hole communicated with the gap is arranged at the lower end of the shell, the movable disc comprises a frustum-shaped base body, a plurality of grinding tool bits are uniformly distributed on the outer side surface of the circumference of the base body and fixedly connected with the base body through bolts, each grinding tool bit comprises a first tool bit, a second tool bit and a third tool bit which are arranged on a tool bit mounting seat, the first tool bit, the second tool bit and the third tool bit are sequentially arranged at intervals along the circumference, the protruding height of the first tool bit is larger than that of the second tool bit, the protruding height of the second tool bit is larger than that of the third tool bit, the first tool bit and the second tool bit are both sharp devices, the sharp angle of the second tool bit is smaller than that of the first tool bit, the second tool bit and the third tool bit form a first group of grinding structures, a second group of grinding structures are axially arranged on the mounting seat at intervals, each grinding structure comprises a fourth tool bit, a fifth tool bit and a sixth tool bit, and the second group of grinding structures and the first group of grinding structures are staggered along the circumferential direction, the dislocation angle is less than 5 degrees;

2. The pulp proportioning process according to claim 1, wherein: the ratio of the pulp output weight of the pulp pool of the blanket layer paper machine to the pulp output weight of the pulp pool of the net layer paper machine is 1: 1.

3. the pulp proportioning process according to claim 2, wherein: the ratio of the output content of the long fibers to the output content of the short fibers is 5-7: 3-5.

4. The pulp proportioning process according to claim 1, wherein: the slurry retention time of the pulp pool of the blanket layer paper machine and the pulp pool of the net layer paper machine is 9-22 min.

5. The pulp proportioning process according to claim 1, wherein: after the long fibers pass through a first pulping machine and a second pulping machine, the pulping concentration is 10 percent, the long fibers are diluted to 3 percent after pulping, mechanical stirring and water bath heating are carried out, and the temperature of the pulp is kept at 40 ℃.

6. The pulp proportioning process according to claim 1, characterized in that: the power of the fourth refiner was 350k W.

7. The pulp proportioning process according to claim 1, wherein: deionized water at 40 degrees celsius was added while the pulper broke.

8. The pulp proportioning process according to claim 1, wherein: and an elastic sheet is clamped between the grinding tool bit and the seat body.

9. The pulp proportioning process of claim 8, wherein: the grinding tool bit covers the elastic sheet.

10. The pulp proportioning process according to claim 1, wherein: the left end of the movable disc extends into the material conveying pipeline, one end of the movable disc extending into the material conveying pipeline is arc-shaped, and a guide plate used for guiding materials is arranged on the end face of the arc-shaped.

11. The pulp proportioning process according to claim 1, wherein: the right end face of the movable disc is provided with a plurality of protruding ring bodies, and the shell is provided with grooves matched with the protruding ring bodies to achieve sealing.