CN212477276U - Purification system of surface sizing starch glue solution - Google Patents

Abstract

The utility model discloses a clean system of surface sizing starch glue solution. Including pipe connection in proper order and the rubberizing groove, sizing applicator, the backward flow groove that forms the return circuit, wherein, pipeline formation rubberizing unit between the sizing applicator is connected to the rubberizing groove, and the sizing applicator is connected the backward flow groove and is led to the pipeline formation backward flow unit in rubberizing groove, its characterized in that: the gluing unit further comprises a feeding screen, and the backflow unit further comprises a slag remover and a square vibrating screen which are sequentially connected; the feeding sieve is used for filtering impurities in the glue solution of the gluing unit; the slag remover is used for removing impurities with high density in the glue solution of the reflux unit; the square vibrating screen is used for removing impurities with large volume in the glue solution of the reflux unit; the application of the purification system is to respectively arrange the upper roller and the lower roller of the sizing machine with independent purification systems for simultaneously removing impurities. The utility model discloses adopt centrifugal force slagging-off and the mode of volume slagging-off with the backward flow glue solution in proper order, more effectively improve the cleanliness factor of backward flow starch glue solution.

Description

Purification system of surface sizing starch glue solution

Technical Field

The utility model belongs to the technical field of waste paper papermaking production technology, a clean system of surface sizing starch glue solution is related to.

Background

The main raw material for producing the packing paper is waste paper, and the waste paper is recycled to manufacture the cardboard paper, which needs a certain special property, mainly comprising a series of properties such as paper strength, printability, water resistance, stiffness and the like. The waste paper is smashed, decolored and pulped to produce the recycled paper through various procedures, and 80 percent of the raw materials of the packing paper are from the recycled waste paper, so the waste paper is praised as environment-friendly paper with low energy consumption and light pollution. However, the waste paper may be paper made of wood fiber recycled for many times, so that the paper fiber is short, and impurities such as fine sand are also mixed in the processes of papermaking, recycling and reusing. Because the quality of waste paper is poor and the strength is low, the surface gluing process is needed to improve the strength in the production flow of the packaging paper, and the surface gluing process is to change starch into liquid with certain viscosity after the starch is steamed, gelatinized, screened and purified, and the liquid is called surface gluing, namely surface gluing starch glue solution. The glue solution is transferred to the paper surface of the base paper by surface sizing equipment according to a certain solid content and viscosity range, so that the paper has higher strength (breakage resistance, folding resistance, ring crush resistance, stiffness, fracture length and the like), and then aluminum sulfate and a surface sizing agent (water repellent agent) are added into the glue solution so that the paper has certain water resistance, and the whole process is called surface sizing of the paper. The requirement on the cleanliness of starch glue solution is high when the using amount of starch is large, and meanwhile, a large amount of fine sand grains and paper wool in waste paper bring backflow glue solution, so that the existing glue solution backflow treatment cannot meet the requirement easily.

In the prior art, the impurity treatment of the surface glue is mainly realized by screening impurities in the glue solution through a size method through a surface glue vibrating screen and a pressure screen. Wherein, the surface rubber vibrating screen is to pass the original rubber solution through a sieve plate with a certain mesh number, and impurities with larger size can be separated; the pressure sieve is used for cleaning out impurities with larger sizes by passing glue solution through a sieve frame with a certain mesh number under certain pressure.

The applicant discloses an invention patent named 'a sediment system for improving the cleanliness of surface sizing starch solution' on 22.02/2019, and the application number of the invention patent is 201811205760.0, the sediment system of the patent comprises a starch glue charging barrel connected with a starch glue filter, the starch glue filter is connected with a sizing machine, and a scraping rod and a rubber roller are arranged in the sizing machine to form a rubber film on a paper surface. The sizing machine is connected with a square vibrating screen, the square vibrating screen is connected with a starch glue charging bucket, and the returned starch liquid is subjected to primary impurity removal through the square vibrating screen. The sediment system sets up sediment jar, and sediment jar sets up feed inlet, discharge gate, and starch glue filter sets up filtering zone, centrifugation district, and the filtering zone sets up the export and will thick impurity discharge, and the centrifugation district inlayer sets up exit linkage sediment jar feed inlet, and the starch liquid that contains heavy impurity gets into sediment jar and handles, and the centrifugation district skin sets up exit linkage sizing machine and discharges good glue. The discharge port of the sediment tank is connected with a circular vibrating screen, the circular vibrating screen is connected with a starch glue charging bucket, and starch liquid is filtered again by the circular vibrating screen and returns to the charging bucket after being processed by the sediment tank. Although this sediment system has guaranteed the certain cleanliness factor of glue solution, only set up a side vibration sieve on the backward flow branch road of this system, the cleanliness factor on the backward flow branch road is not enough, directly adds to mix with the original gelatinization starch glue solution that does not use in the bucket behind the charging basket, can dilute the concentration of impurity, in follow-up edulcoration process, edulcoration efficiency can reduce. The applicant has found that in the actual production process, the process in the system can be further improved.

Disclosure of Invention

1. Problems to be solved

The utility model provides a clean system of surface sizing starch glue solution, its aim at solve the problem that current glue solution slagging-off effect is not good.

The utility model also provides a glue solution clean system of two-sided glueing of paper, its aim at strengthens glue solution slagging-off dynamics.

2. Technical scheme

In order to solve the above problem, the utility model discloses the technical scheme who adopts as follows:

a purification system for surface sizing starch glue solution comprises a sizing tank, a sizing machine and a backflow tank which are sequentially connected through pipelines and form a loop, wherein the sizing tank is connected with a pipeline between the sizing machines to form a sizing unit; the feeding sieve is arranged between the gluing tank and the gluing machine and used for removing impurities in glue solution of the gluing unit, and the glue solution flowing out of the gluing tank enters the gluing machine for gluing after impurity removal treatment of the feeding sieve; the glue inlet end of the slag remover is connected with the glue outlet end of the reflux tank, and the slag remover is used for removing impurities with high density in the glue solution of the reflux unit; the glue inlet end of the square vibrating screen is connected with the glue outlet end of the slag remover, the glue outlet end of the square vibrating screen is connected with the upper glue tank and used for introducing the treated backflow glue solution into the glue tank, and the square vibrating screen is used for removing large-volume impurities in the backflow unit glue solution.

Further, the feeding sieve is a pressure sieve, and sieve gaps of the pressure sieve are 80-100 microns.

Furthermore, two pressure sieves are connected in series between the sizing groove and the sizing machine.

Further, the slag remover is a conical slag remover, the pressure difference of an inlet and an outlet of the slag remover is 100-150 Kpa, and the feeding pressure is 300 Kpa.

Furthermore, the slag remover is provided with a plurality of slag removers which are connected in series for use, and preferably 10 slag removers are connected in series to form a group for use.

Furthermore, the backflow unit is also provided with a slag settling tank, and the slag settling tank is used for purifying slag glue discharged by the slag remover.

Furthermore, a plurality of baffles are arranged at the top of the slag settling tank downwards in parallel.

Further, the number of the baffle plates is 4.

Furthermore, the screen mesh of the square vibrating screen is 100-120 meshes.

The glue solution purification system for double-sided gluing of the paper is characterized in that the gluing machine is provided with an upper roller and a lower roller which are used for simultaneously gluing the front side and the back side of the paper respectively, wherein the upper roller and the lower roller of the gluing machine are respectively provided with the independent purification systems.

Furthermore, the upper roller and the lower roller are metal bars with the diameter of 10-15 mm, uniform grooves are distributed on the surfaces of the upper roller and the lower roller, and surface glue is uniformly distributed on the sizing roller through the grooves, so that the paper surface can be attached with relatively uniform surface glue.

3. Advantageous effects

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model aims at the problem that more impurities can be generated in the process of producing paperboards or cartons by using waste paper, a group of slag separators are arranged for treating fine sand grains and paper wool in the backflow glue solution, the backflow glue solution is firstly subjected to the slag separators to remove the fine sand grains, and then is further subjected to the vibration sieve to filter light impurities such as the paper wool; the deslagging device arranged in the backflow unit adopts a centrifugal force heavy slag removal mode, so that the existing mode of filtering impurities by adopting a volume mode is avoided, sand grains with small volume and large density are omitted, specifically, the deslagging device utilizes the density of a substance to separate, the centrifugal force is larger when the density is larger, fine sand with large density in glue liquid can be separated in the rotating process of the glue liquid, the traditional treatment process can only separate impurities with large size in the glue liquid, the sand grains with small size cannot be screened out, and the fine sand grains can block a hanging rod of the glue applicator after entering a system, so that the glue application is not uniform; after the centrifugal force is used for removing slag, light fibers such as paper wool and the like are removed in a volume screening mode, so that the purification of glue solution in the reflux unit is facilitated;

(2) the utility model moves the centrifugal force slag separator of the original gluing unit into the reflux unit to treat heavy slag firstly, avoids the heavy slag of the reflux glue solution from flowing into the gluing groove, not only lightens the phenomenon that the inlet of the gluing groove is easy to block, but also avoids the clean glue solution in the gluing groove from being polluted firstly, thus leading to the heavy slag to be dispersed, being not beneficial to further impurity removal process and finally influencing the cleanliness of the glue solution;

(3) the utility model discloses the glue solution that needs to purify adopts starch gelatinization's processing to come at first, wherein the mechanism of action of gelatinization starch does, starch after the gelatinization is evenly paintd on the paper surface, improve the intensity of paper, because of starch is the organic matter that has great molecular weight, through boiling gelatinization, can be decomposed into the organic molecular group of group dress into the molecular structure that has a lot of branches, the molecular structure of branch can have stronger intensity after the surface drying of paper combines, thereby improve the intensity of paper, in surface collagen liquid, add the surface sizing agent that has hydrophobic nature, thereby make the paper have water resistance;

(4) the utility model discloses still further respectively increase mutually independent clean system in the glueing technology of paper positive and negative, originally setting up a clean system, the cleanliness factor of backward flow glue solution more by force.

Drawings

FIG. 1 is a process flow diagram of a purification system in example 1 of the present invention;

FIG. 2 is a process flow diagram of the purification system of example 2 of the present invention;

FIG. 3 is a schematic structural view of the slag settling tank of the present invention;

FIG. 4 is a process flow diagram of a reflux unit in the purification system of example 2 of the present invention;

FIG. 5 is a process flow diagram of the purification system of example 3 of the present invention;

FIG. 6 is a process flow diagram of the purification system of example 4 of the present invention;

FIG. 7 is a process flow diagram of a reflux unit in a purification system according to embodiment 4 of the present invention;

in the figure:

100. gluing a groove; 200. a gluing unit; 210. feeding and screening; 211. a first section of pressure screen; 212. a second section of pressure screen; 300. a sizing machine; 310. gluing an upper roller; 320. a sizing lower roller; 400. a reflux tank; 500. a reflux unit; 510. a slag remover; 520. square vibrating screen; 530. a slag settling tank; 531. a first baffle plate; 532. a second baffle; 533. a third baffle plate; 534. a fourth baffle; 535. A first ball valve; 536. a second ball valve; 537. a third ball valve; 538. a fourth ball valve; 539. and a fifth ball valve.

Detailed Description

The present invention will be further described with reference to the following specific embodiments.

Example 1

The purification system of the surface sizing starch glue solution of the embodiment comprises a sizing tank 100, a feeding sieve 210, a sizing machine 300, a reflux tank 400, a slag separator 510 and a square vibrating sieve 520 which are sequentially connected by pipelines and form a loop, wherein the glue solution in the sizing tank 100 flows to the feeding sieve 210 and the part left in the sizing machine 300 forms a sizing unit 200, the sizing unit 200 removes impurities from the glue solution in the sizing tank 100 and then leads the removed impurities into upper and lower sizing rollers in the sizing machine 300, and the front and back surfaces of paper on the sizing unit are coated with the glue solution and formed into a film; the glue solution flowing back from the glue applicator 300 enters a return tank 400, is subjected to impurity removal by a slag remover 510 and a square vibrating screen 520 and then flows to the gluing tank 100 to form a glue return unit, the glue return unit recovers the redundant glue solution of the glue applicator 300, a series of purification and impurity removal processes are carried out, the returned glue solution is treated and then is sent to the gluing tank 100, the recycling of the glue solution is completed, raw materials are saved, and the cost of the glue solution is reduced.

Referring to fig. 1, the whole process for purifying the starch glue solution specifically comprises the steps of inputting a starch glue solution stock solution into a gluing tank 100, starting a feeding pump, and conveying the glue solution in the gluing tank 100 to a feeding sieve 210 to remove the residues of the starch glue solution stock solution, wherein the feeding sieve 210 is a pressure sieve, the pressure of a pulp inlet at the upper part of the pressure sieve is 72Kpa, the pressure of a pulp outlet at the lower part of the pressure sieve is 57Kpa, the pressure difference between the inlet and the outlet is 15Kpa, good pulp flows out of the pulp outlet to an upper roller and a lower roller of a sizing machine 300 to glue paper, and residue glue discharged from the bottom of the pressure sieve enters a reflux tank 400 to be treated; since this stage is a relatively pure stock solution of starch gum, almost all of it can enter the size press 300 through the feed screen 210. The upper roller and the lower roller in the sizing machine 300 are metal bars with the diameter of 10-15 mm, grooves are uniformly distributed on the upper roller and the lower roller, glue solution is uniformly distributed on the upper roller and the lower roller through the grooves and coated on the front surface and the back surface of paper to form films, the glue solution which is excessive and flows out of the sizing machine 300 is purified in a backflow unit 500, namely the backflow glue solution which flows out of the sizing machine 300 enters a backflow tank 400, a glue material deslagging pump conveys the backflow glue solution in the backflow tank 400 to a deslagging device 510, the deslagging device 510 is formed by connecting ten conical deslagging devices 510 in series, the feeding pressure is 300Kpa, the pressure difference is 100-150 Kpa, a screen mesh with the size of 60-80 meshes is arranged at the upper part of the specific deslagging device 510, large-volume fibers in the backflow glue solution are filtered, the filtered glue solution enters a centrifugal area below the deslagging device 510, sand grains with large density are discharged by centrifugal force, the ten glue solutions which are repeatedly deslagged, the fine pulp passing through is conveyed to a square vibrating screen 520 for further deslagging; the square vibrating screen 520 is provided with a screen mesh of 100-120 meshes, fibers such as paper wool and the like with large volume in the backflow glue solution are further removed, the good pulp passing through the square vibrating screen 520 is conveyed to the upper glue tank 100, and the impurity removal of the backflow unit 500 is completed.

After the backflow glue solution is purified by the backflow unit 500, the backflow glue solution enters the gluing tank 100, at the moment, starch glue solution stock solution is still input into the gluing tank 100 all the time, and the processed backflow glue solution avoids directly adding into the gluing tank 100 to pollute the original starch glue solution of the gluing tank 100 due to the recycling of the backflow glue solution, wherein the input speed of the subsequent clean starch glue solution stock solution is smaller than the amount of the first input stock solution; after the backflow glue solution is mixed into the starch glue solution stock solution, the impurity removal of the gluing unit 200 plays a role, the backflow glue solution is conveyed to the pressure screen by the feeding pump, the residue glue discharged from the bottom of the pressure screen enters the backflow tank 400 to be treated by the backflow unit 500, and the good pulp flowing out of a pulp outlet through a 80-100 mu m screen slot flows to upper and lower rollers of the glue applicator 300 to glue paper.

The cleaning system of the present embodiment circulates the above-mentioned reflow unit 500 and the gumming unit 200 to perform the gumming process in the actual production.

Example 2

The purification system of a surface sizing starch glue solution of this example is basically the same as that of example 1, except that: a slag settling tank 530 is also provided in the reflow unit 500.

Referring to fig. 2, the feed inlet of the slag settling tank 530 is connected to the slag discharge port of the slag remover 510 for recycling the rubber slag discharged from the slag remover 510. The structure of the slag settling tank 530 is shown in fig. 3, a first baffle 531, a second baffle 532, a third baffle 533 and a fourth baffle 534 are arranged in parallel at the top of the slag settling tank 530, after slag glue discharged from the slag remover 510 enters the slag settling tank 530, heavy slag sinks into the bottom of the slag settling tank 530 under the action of inertia through the disturbance of the first baffle 531, the second baffle 532, the third baffle 533 and the fourth baffle 534, a slag discharge port is arranged at the bottom of the slag settling tank 530, the closing of the slag discharge port is controlled by the first ball valve 535, when the slag settling tank 530 normally works, the first ball valve is intermittently opened and closed, impurities separated from the bottom of the slag settling tank 530 are discharged intermittently through the slag discharge port 535, the impurity removal effect is prevented from being influenced by the long-time accumulation of the impurities in the system, the cleanliness of starch solution in the system is reduced, and the flow chart of the backflow unit 500 of this embodiment is shown in fig. 4.

It should be noted that a cleaning water gap is arranged at the top of the slag settling tank 530, a second ball valve 536 is arranged at the cleaning water gap, and when the slag settling tank 530 needs to be cleaned, water can be introduced from the cleaning water gap to clean the interior of the slag settling tank 530; the feed inlet of sediment groove 530 sets up third ball valve 537, and the discharge gate sets up fourth ball valve 538, and during operation, third ball valve 537, fourth ball valve 538 are in the open mode, and slag that slag separator 510 discharged gets into sediment groove 530 through the feed inlet, gets into backwash tank 400 from the discharge gate after handling, realize the cyclic utilization of slag glue. When the slag settling tank 530 needs to be cleaned and maintained or other bad conditions occur, the third ball valve 537 and the fourth ball valve 538 are closed, so that the slag settling tank 530 is in a closed state, and the cleaning and the maintenance are convenient. Communicating pipelines are arranged on one sides, away from the slag tank, of the third ball valve 537 and the fourth ball valve 538 of the slag settling tank 530, a fifth ball valve 539 is arranged on the communicating pipelines, and when the slag settling tank 530 works normally, the fifth ball valve 539 is in a closed state, so that the normal work of the slag settling tank 530 is not influenced; when the sediment tank 530 leaks or other abnormal conditions occur, the second ball valve 536 and the third ball valve 537 are closed, the fifth ball valve 539 is opened, the glue solution in the communicating pipeline can be discharged from the fifth ball valve 539, the interference to the maintenance process of the sediment tank 530 is avoided, the influence caused when the sediment tank 530 is restarted is also avoided, and the maintenance process is conveniently and smoothly carried out.

Example 3

The purification system of a surface sizing starch glue solution of this example is basically the same as that of example 2, except that: two pressure sieves which are connected in series are arranged in the gluing unit 200 and respectively comprise a first-section pressure sieve 211 and a second-section pressure sieve 212, wherein the sieve gaps of the first-section pressure sieve 211 and the second-section pressure sieve 212 are both 80-100 micrometers.

Referring to fig. 5, in the glue applying unit 200, the glue solution is delivered from the glue applying tank 100 to the first-stage pressure sieve 211 by the feed pump, the pressure at the pulp inlet of the upper part of the first-stage pressure sieve 211 is 72Kpa, the pressure at the pulp outlet of the lower part of the pressure sieve is 57Kpa, the pressure difference between the inlet and the outlet is 15Kpa, the first-stage residue glue discharged from the bottom of the first-stage pressure sieve 211 enters the backflow tank 400 for treatment, the good pulp passing through the first-stage pressure sieve 211 is delivered to the second-stage pressure sieve 212, the second-stage residue glue discharged from the second-stage pressure sieve 212 is returned to the first-stage pressure sieve 211 for circulation treatment under the same pressure difference, and the second-stage good pulp passing through the second-stage pressure sieve 212 is delivered to.

Example 4

The glue solution purifying system for double-sided sizing of paper in this embodiment is substantially the same as that in embodiment 3, except that the upper roller and the lower roller of the size press 300 are respectively provided with independent purifying systems.

Referring to fig. 6, the purification processes of the starch glue solution in this embodiment are a purification process of the starch glue solution on the front side of the paper and a purification process of the starch glue solution on the back side of the paper. The purification system of the starch glue solution on the front surface of the paper specifically comprises the following steps: inputting a starch glue solution stock solution into a front-face gluing tank, starting a feeding pump, conveying the glue solution in the front-face gluing tank to a front-face section pressure sieve corresponding to the glue solution in the front-face gluing tank, wherein the pressure of a pulp inlet at the upper part of the front-face section pressure sieve is 72Kpa, the pressure of a pulp outlet at the lower part of the pressure sieve is 57Kpa, the pressure difference of the inlet and the outlet is 15Kpa, a section of residue glue discharged from the bottom of the front-face section pressure sieve enters a reflux tank 400 in the paper front-face starch glue solution purification process for treatment, fine pulp is conveyed to the front-face section pressure sieve through the front-face section pressure sieve, under the same pressure difference, two sections of residue glue discharged from the front-face section pressure sieve are conveyed back to the front-face section pressure sieve for circulation treatment, and the second sections of fine pulp is conveyed to a gluing lower.

The excessive glue solution flowing out of the lower gluing roller 320 is purified in a reflux unit 500 of the paper front starch glue solution purification process, namely the reflux glue solution of the lower gluing roller 320 enters a reflux tank 400, a glue material slag removal pump conveys the reflux glue solution in the reflux tank 400 to a slag remover 510, the slag remover 510 is formed by connecting six conical slag removers 510 in series, the feeding pressure of the slag remover is 300Kpa, the pressure difference is 100-150 Kpa, the upper part of the slag remover 510 is provided with a 60-80 mesh screen, large-volume fibers in the reflux glue solution are filtered, the filtered glue solution enters a centrifugal area below the slag remover 510, sand grains with large density are discharged by utilizing centrifugal force, the obtained glue solution is repeatedly subjected to slag removal by the six slag removers 510, the slag glue which does not pass through the slag remover 510 is discharged to a slag settling tank 530, and is disturbed by a first baffle 531, a second baffle 532, a third baffle 533 and a fourth baffle 534, heavy slag is settled to the bottom of the slag settling tank 530 under the action, good slag is conveyed to the reflux tank 400 from a discharge hole of the slag settling tank 530, so that the recycling of slag glue is realized; the fine pulp passing through the slag remover 510 is conveyed to a square vibrating screen 520 for further slag removal, the square vibrating screen 520 is provided with a screen mesh of 100-120 meshes, fibers such as paper wool with large volume in the backflow glue solution are further removed, the fine pulp passing through the square vibrating screen 520 is conveyed to a front gluing tank 100, and the impurity removal of the backflow unit 500 in the paper front starch glue solution purification system is completed.

After the backflow glue solution of the lower gluing roller 320 is purified by the backflow unit 500, the backflow glue solution enters the gluing tank, and at the moment, the starch glue solution stock solution is still input into the front gluing tank all the time, and the treated backflow glue solution avoids directly adding into the front gluing tank to pollute the original starch glue solution stock solution of the gluing tank due to the recycling of the backflow glue solution of the lower gluing roller 320, wherein the input speed of the subsequent clean starch glue solution stock solution is smaller than the amount of the first input stock solution; after the backflow glue solution of the lower gluing roller 320 is mixed into the starch glue solution stock solution, the function of removing impurities of the gluing unit 200 is achieved, the backflow glue solution is conveyed to the front section of pressure screen by the feeding pump, the pressure of a pulp inlet at the upper part of the front section of pressure screen is 72Kpa, the pressure of a pulp outlet at the lower part of the pressure screen is 57Kpa, the pressure difference of an inlet and an outlet is 15Kpa, the first section of residue glue discharged from the bottom of the front section of pressure screen enters the backflow tank 400 in the purification process of the starch glue solution on the front side of the paper for treatment, the good pulp passing through the front section of pressure screen is conveyed to the front section of pressure screen, under the same pressure difference, the second section of residue glue discharged from the front section of pressure screen is conveyed back to the front section of pressure screen for circulation treatment, and the second section of good pulp passing through the front section.

More importantly, as shown in fig. 7, the backflow unit 500 of the system for purifying the starch glue solution on the reverse side of the paper sheet in the embodiment handles the backflow glue solution flowing out from the sizing upper roller 310 of the sizing machine 300, the pressure of the pulp inlet at the upper part of the upper roller feeding pressure sieve is 91Kpa, the pressure of the pulp outlet at the lower part of the pressure sieve is 67Kpa, the pressure difference between the inlet and the outlet is 24Kpa, and other components are the same as the system for purifying the starch glue solution on the front side of the paper sheet, and are not described again.

It is worth explaining that, by adopting the purification system of the embodiment, the rubber material is taken as a sheet, and compared with the purification system before improvement, the content of fine sand in the rubber material is obviously reduced; the sizing degradation amount is reduced from the original average 149.2T per month to the current average 39T per month, and the degradation amount is reduced by 100T per month on average; adopt the utility model discloses a monthly wiper use amount before clean system is on average 60, adopts the utility model discloses a monthly wiper use amount is on average 29 after the clean system, and the wiper monthly concatenation use amount reduces 31, greatly reduced the processing cost and increased the income of enterprise.

Comparative example

The comparative example adopts the sediment system of the embodiment of the invention patent 'a sediment system for improving the cleanliness of surface sizing starch solution' applied by the applicant at 2019, 02, 22 to purify the surface sizing, and the application number of the patent is 201811205760.0. The resulting purified glue and the produced board were tested in a series.

Particularly, the rubber material purified in the comparative example is taken as a sheet, and the rubber material contains more fine sand, which indicates that the vibrating screen and the sieve in the system of the embodiment can not discharge the fine sand in the waste paper out of the rubber material circulation system.

Performance testing

A series of performance tests were performed on sized paper sheets produced by using the starch glue solution purification systems of examples 1 to 4 and comparative examples, and the results are shown in table 1. Wherein:

1) and (3) testing conditions are as follows: temperature 23 + -1 deg.C, relative humidity RH (50 + -2)%;

2) the checking method comprises the following steps: the method is executed according to the related national GB/T standard, and the moisture test is executed by adopting a GB/T drying method;

3) a paper bursting disk was used at 160 g or less (160 g or less);

4) water absorption: samples 15 x 15cm or special samplers were taken and taken out of the bobby absorptiometer for water absorption testing.

TABLE 1 Performance test results for 85gT paperboard produced in examples 1-4 and comparative examples

From the above test data, it can be seen that the wear resistance, folding resistance, ring crush resistance and water resistance test results of the paperboards obtained by using the glue solution purification systems of examples 1 to 4 and the comparative example all meet the industrial standards, wherein in examples 1 to 4, the breaking resistance, folding resistance and ring crush resistance are sequentially enhanced and are superior to the paperboards obtained by using the purification systems of the comparative example, the water resistance data of the rice steaming surface of the paperboards refers to the weight of water absorbed within a specified time, the water absorption of the front and back surfaces of the paperboards of example 4 in table 1 is the minimum, and the water absorption of the comparative example is obviously excessive.

Claims (9)

1. The utility model provides a clean system of surface sizing starch glue solution, is including pipe connection in proper order and rubberizing groove (100), sizing machine (300), return tank (400) that form the return circuit, and wherein, pipeline formation rubberizing unit (200) between rubberizing groove (100) connection sizing machine (300), and return tank (400) are connected in sizing machine (300) and the pipeline formation return unit (500) that lead to rubberizing groove (100), its characterized in that: the gluing unit (200) further comprises a feeding screen (210), and the backflow unit (500) further comprises a slag remover (510) and a square vibrating screen (520) which are sequentially connected; the feeding sieve (210) is used for filtering impurities in glue solution of the gluing unit (200); the slag remover (510) is used for removing impurities with high density in the glue solution of the reflux unit (500); the square vibrating screen (520) is used for removing large-volume impurities in the glue solution of the reflux unit (500).

2. The system for purifying a surface sizing starch glue solution according to claim 1, characterized in that: the feeding sieve (210) is a pressure sieve, and the sieve gap of the pressure sieve is 80-100 mu m.

3. A system for purifying a surface sizing starch dope according to claim 2, characterised in that: two pressure sieves are connected in series between the gluing groove (100) and the gluing machine (300).

4. The system for purifying a surface sizing starch glue solution according to claim 1, characterized in that: the slag separator (510) is a conical slag separator (510), and the pressure difference of an inlet and an outlet of the slag separator (510) is 100-150 KPa.

5. The system for purifying a surface sizing starch glue solution according to claim 4, characterized in that: the slag remover (510) is provided with a plurality of slag removers which are connected in series for use.

6. The system for purifying a surface sizing starch glue solution according to claim 5, characterized in that: the backflow unit (500) is further provided with a slag settling tank (530), and the slag settling tank (530) is used for purifying slag rubber discharged by the slag remover (510).

7. The system for purifying a surface sizing starch glue solution according to claim 6, characterized in that: the top of the slag settling tank (530) is downwards provided with a plurality of baffles in parallel.

8. The system for purifying a surface sizing starch glue solution according to claim 7, characterized in that: the baffle is equipped with 4.

9. The system for purifying a surface sizing starch glue solution according to claim 1, characterized in that: the screen mesh of the square vibrating screen (520) is 100-120 meshes.

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