A high consistency refining process

Abstract

The application provides a high-concentration pulp mixing process, which comprises the following steps: placing short fiber pulp into a short fiber pre-beating tank and standing; mixing water-soluble film fragments into the short fiber pulp; and feeding the short fiber pulp mixed with the water-soluble film fragments into a high-concentration pulper to perform pulping, so as to obtain short fiber pulp. By mixing the water-soluble film fragments into the pulp, the application can form a shield on the opposite edges of the pulper, so that the pulp layer can uniformly stay in the middle of the pulper, and the situation that the pulp layer on the edges is thinned can be eliminated. The water-soluble film fragments in the short fiber pulp can be dissolved after a period of time in the grinding process, so that the characteristics of the short fiber pulp are not affected. The application can eliminate the empty grinding phenomenon, offset the tooth surface empty grinding phenomenon, improve the pulping efficiency, and reduce the pulper wear.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of papermaking and pulp processing. The present application specifically relates to a mixed process method and system for high-concentration refining. BACKGROUND

[0002] A large amount of fiber fanning can be generated in the high-concentration refining process, increasing the number of hydrogen bonds between fibers and improving the strength of paper, effectively reducing the proportion of long fibers. At the same time, high-concentration refining softens the fibers, improves the softness of the paper, and obtains good surface smoothness and good hand feeling. In addition, high-concentration refining can obtain higher strength than low-concentration refining at a lower beating degree, and low-beating-degree paper can obtain better bulkiness.

[0003] However, in the processing of high-concentration refining, high-speed elements are needed for grinding treatment to achieve a grinding degree, so high-concentration refining is prone to concentrate in the local central axis position during grinding, thereby affecting the grinding time and efficiency. SUMMARY

[0004] The purpose of the present application is to provide a mixed process method and system for high-concentration refining, which solves the problem of long grinding time and low efficiency of existing high-concentration refining.

[0005] In a first aspect, the present application provides a mixed process method for high-concentration refining, comprising:

[0006] Step S101, placing short fiber broke into a short fiber pre-beating tank for standing;

[0007] Step S102, mixing the short fiber broke with a set proportion of water-soluble film fragments;

[0008] Step S103, inputting the short fiber broke mixed with water-soluble film fragments into a high-concentration refiner for refining to obtain short fiber refined pulp. The short fiber refined pulp is refined by a refining blade;

[0009] Step S104, injecting the short fiber refined pulp into a high-concentration post-beating tank for standing;

[0010] Step S105, obtaining papermaking pulp by standing the short fiber refined pulp.

[0011] The step S102 comprises: setting a water-soluble film fragment mixing device, which comprises a mixing fragment chamber; the mixing fragment chamber can cut the water-soluble film into strip fragments with a length of 20 mm to 15 mm and a width of 8 mm to 5 mm, or strip fragments with a length of less than 15 mm and a width of 5 mm; the water-soluble film has a thickness of 1 mm to 2 mm; the water-soluble film fragment mixing device outputs the water-soluble film fragments through an output pipeline connected with the mixing fragment chamber; the water-soluble film fragments are mixed into the short fiber pulp according to a set proportion through a first pulp pumping pipeline connected with the output pipeline of the water-soluble film fragment mixing device; the mixing fragment chamber is connected with a water-solution injection port, so that the water-soluble film fragments are mixed with the water solution to form water-soluble film fragment pulp, which is output from the output pipeline; and the water-soluble film fragment pulp accounts for 15% to 20% of the short fiber pulp.

[0012] In another embodiment of the mixing process method of high-concentration pulp grinding, after the step S101, the method further comprises: a step S201 of cleaning residues in the short fiber pulp through a high-concentration residue discharger connected with the conveying pipeline of the short fiber pulp.

[0013] A step S202 of setting a thickener and a flow meter on the conveying pipeline to measure the concentration and flow of the short fiber pulp in the conveying pipeline; and a step S203 of sending control information for adjusting the concentration and flow if the current concentration and flow are greater than a set threshold.

[0014]

[0015] In another embodiment of the mixing process method of high-concentration pulp grinding, the step S103 comprises: two parallel circular grinding pieces are arranged; and a gap is arranged between the two grinding pieces.

[0016] In the embodiment, grinding tooth grooves are arranged on the opposite surfaces of the grinding pieces; the grinding tooth grooves extend outward along a spiral line from the center of the grinding piece; and the grinding concentration of the short fiber pulp is 15% to 25%.

[0017] In another embodiment of the mixing process method of high-concentration pulp grinding, after the step S101, the method further comprises: a step S301 of extracting the short fiber pulp from the short fiber beating-up tank through a second pulp pumping pipeline; and a step S302 of outputting the short fiber pulp from the second pipeline.

[0018] The step S302 comprises: setting a second thickener and a second flow meter in the second pipeline.

[0019] The step S303 comprises: if the short fiber pulp in the second pipeline measured by the second thickener and the second flow meter is at a low concentration set for grinding, controlling the second pipeline to output the short fiber pulp to a low-concentration grinding machine; and grinding the low-concentration pulp through grinding pieces.

[0020] ​Step S304, the low consistency short fiber pulp is milled by a low consistency mill to obtain low consistency short fiber pulp;

[0021] Step S305, the low consistency short fiber pulp is injected into a low consistency mill to be kept in a post-mill pool.

[0022] The features, technical characteristics, advantages and implementation of the mixing process method and system of high consistency pulp will be further described in a clear and understandable manner in combination with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a flowchart for illustrating the mixing process method of high consistency pulp in an embodiment of the present application.

[0024] Figure 2 is a structural diagram for illustrating the grinding component of a high consistency mill in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, objects and effects of the present application, the specific embodiments of the present application will be described in combination with the accompanying drawings, in which the same reference numerals represent the same or similar components having the same function.

[0026] In this document, "schematic" means "serving as an example, instance or illustration", and any diagram, embodiment described as "schematic" in this document should not be interpreted as a more preferred or more advantageous technical solution. In order to make the drawings simple, only the parts related to the present exemplary embodiments are schematically shown in the drawings, which do not represent the actual structure and true scale of the product.

[0027] In a first aspect, the present application provides a mixing process method of high consistency pulp, which comprises:

[0028] Step S101, short fiber pulp is put into a short fiber pre-beating pool to be kept;

[0029] Step S102, the short fiber pulp is mixed with a set proportion of water-soluble film fragments;

[0030] In this step, the water-soluble film is crushed into thin strips and mixed into the short fiber pulp.

[0031] Step S103, the short fiber pulp mixed with water-soluble film fragments is input into a high consistency mill to be milled to obtain short fiber pulp; the short fiber pulp is milled by a mill plate.

[0032] In this step, as Figure 2As shown, the grinding component 10 of the high-consistency refiner includes a stationary grinding disc 12 and a rotating grinding disc 11. Short fiber pulp enters the grinding component 10 of the high-consistency refiner and is ground on the opposite surfaces of the stationary grinding disc 12 and the rotating grinding disc 11.

[0033] Step S104: Pour the short fiber pulp into the high-consistency grinding tank and let it stand.

[0034] Step S105: Paper pulp is obtained by refining short fibers after standing.

[0035] based on Figure 2 In the structure described above, when the slurry enters the tooth groove from a small radius in the grinding disc and moves towards a larger radius, the circumference continuously increases, and the slurry layer continuously thins from the inside to the outside, becoming thinner closer to the outer circle of the tooth surface. Since the short fiber pulp in this invention is mixed with water-soluble film fragments, these fragments will accumulate at the edge A of the moving grinding disc 12 and the rotating grinding disc 11 under the action of centrifugal force.

[0036] By creating a shield at the opposite edges of the grinding disc, the slurry layer is evenly concentrated in the center of the disc, eliminating the thinning of the slurry layer at the edges. Simultaneously, the water-soluble film fragments in the short-fiber pulp of this invention dissolve over time during the grinding process, thus not affecting the characteristics of the short-fiber pulp. Therefore, this invention eliminates the phenomenon of cavitation grinding on the tooth surfaces, counteracting this issue, improving grinding efficiency while reducing grinding disc wear.

[0037] Step S102 includes: setting up a water-soluble membrane fragment mixing device, which includes a fragment mixing chamber. The fragment mixing chamber can cut the water-soluble membrane into strip fragments with a length of 20mm to 15mm and a width of 8mm to 5mm, or strip fragments with a length of less than 15mm and a width of 5mm. The thickness of the water-soluble membrane is 1mm to 2mm. The water-soluble membrane fragment mixing device outputs the water-soluble membrane fragments through an output pipe connected to the fragment mixing chamber. This ensures that the fragments can form clumps at the edge of the grinding disc, effectively blocking the slurry layer. At the same time, the clumps are also easier to consume.

[0038] The first slurry pump and the slurry delivery pipeline are connected to the output pipeline of the water-soluble film fragment mixing device so that the water-soluble film fragments can be mixed into the short fiber pulp according to a set ratio.

[0039] The mixing chamber is connected to the aqueous solution inlet, allowing the water-soluble membrane fragments to be mixed with the aqueous solution to form a water-soluble membrane fragment slurry, which is then output through the outlet pipe. The water-soluble membrane fragment slurry accounts for 15% to 20% of the short fiber slurry, thus ensuring a 20% barrier area is formed on the outside of the grinding disc.

[0040] In another embodiment of the high consistency refining method, after step S101, the method further comprises step S201 of cleaning the residual in the short fiber pulp by connecting the high consistency discharge device of the short fiber pulp conveying pipeline.

[0041] In step S202, a consistency meter and a flow meter are arranged on the conveying pipeline to measure the consistency and flow of the short fiber pulp in the conveying pipeline. If the current consistency and flow are greater than the set threshold, control information for adjusting the consistency and flow is sent out.

[0042] In step S203, the short fiber pulp is refined by the double-cylinder refiner. Thus, the refining quality is ensured.

[0043] In another embodiment of the high consistency refining method, in step S103, the refining sheet is a circular refining sheet arranged in parallel, and a gap is arranged between the two refining sheets. The short fiber pulp is ground between the two refining sheets through the opposite surfaces of the two refining sheets.

[0044] In the embodiment, a grinding tooth groove is arranged on the opposite surface of the refining sheet. The grinding tooth groove extends outward along a spiral trajectory from the center of the refining sheet. The short fiber pulp has a consistency of 15-25%.

[0045] In another embodiment of the high consistency refining method, after step S101, the method further comprises step S301 of extracting the short fiber pulp from the short fiber front tank by a second pulp pump and outputting the short fiber pulp to the outside through a second pipeline.

[0046] In step S302, a second consistency regulator and a second flow meter are arranged in the second pipeline.

[0047] In step S303, if the short fiber pulp in the second pipeline measured by the second consistency regulator and the second flow meter is at a set low consistency for refining, the second pipeline is controlled to output the short fiber pulp to a low consistency refiner. The low consistency pulp is refined by the refining sheet.

[0048] In step S304, the low consistency refiner refines the short fiber pulp to obtain low consistency short fiber pulp.

[0049] In step S305, the low consistency short fiber pulp is injected into the low consistency refiner tank for standing. Thus, the refining quality is ensured. In another embodiment of the high consistency refining method, in step S303, the short fiber pulp is mixed with a set proportion of water-soluble film fragments.

[0050] In step S304, the short fiber pulp mixed with the water-soluble film fragments is input into the low consistency refiner for refining.

[0051] In another embodiment of the mixing process of high consistency pulp, the mixing process of high consistency pulp further comprises:

[0052] In another embodiment of the mixing process of high consistency pulp, the mixing process of high consistency pulp further comprises:

[0053] In step S401, the mixed fiber pulp is put into the mixed fiber pulp chest for standing.

[0054] In step S402, the mixed fiber pulp is mixed with a set proportion of water-soluble film pieces, and the mixed fiber pulp is transported through the third pipeline. The third consistency regulator and the third flow meter are arranged in the third pipeline.

[0055] In step S403, if the mixed fiber pulp in the third pipeline measured by the third consistency regulator and the third flow meter is of a set low consistency pulp consistency, the third pipeline is controlled to output the mixed fiber pulp to the low consistency pulp machine. The low consistency pulp is ground by the pulp sheet.

[0056] The mixed fiber pulp is ground by the low consistency pulp machine to obtain the mixed fiber pulp.

[0057] In step S404, the mixed fiber pulp is injected into the mixed fiber pulp chest for standing.

[0058] In step S405, the papermaking pulp is obtained by the standing mixed fiber pulp.

[0059] In another embodiment of the mixing process of high consistency pulp, the mixing process of high consistency pulp further comprises: the standing mixed fiber pulp is input into the paper machine headbox mixer for mixing, the mixed pulp is input into the paper machine headbox for standing, and the papermaking pulp is obtained after standing. Thus, the pulp quality is ensured.

[0060] It should be understood that although the present specification is described in terms of various embodiments, each embodiment does not necessarily contain only one independent technical solution, and the description of the specification is only for the sake of clarity. The skilled person should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by the skilled person.

[0061] The above series of detailed descriptions are only specific descriptions of the feasible embodiments of the present application, and are not intended to limit the protection scope of the present application. Any equivalent embodiments or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

Claims

1. A mixing process for high-consistency pulp, characterized in that, It includes: Step S101: Place the short fiber pulp into the short fiber pre-pulverizing tank and let it stand. Step S102: Mix the short fiber pulp with a set ratio of water-soluble membrane fragments; Step S103: The short fiber pulp mixed with water-soluble film fragments is fed into a high-consistency refiner for refining to obtain short fiber pulp; the short fiber pulp is then refined by a refining disc. Step S104: The short fiber pulp is injected into a high-consistency grinding tank and allowed to stand. Step S105: Paper pulp is obtained by refining short fibers after standing. Step S102 includes: A water-soluble membrane fragment mixing device is provided, which includes a fragment mixing chamber; the fragment mixing chamber is capable of cutting the water-soluble membrane into strip fragments with a length of 20mm to 15mm and a width of 8mm to 5mm, or strip fragments with a length of less than 15mm and a width of 5mm; the thickness of the water-soluble membrane is 1mm to 2mm; the water-soluble membrane fragment mixing device outputs water-soluble membrane fragments through an output pipe connected to the fragment mixing chamber; Short fiber pulp is fed through a first slurry pump and a slurry delivery pipeline; the slurry delivery pipeline is connected to the output pipeline of the water-soluble membrane fragment mixing device so that the water-soluble membrane fragments can be mixed into the short fiber pulp according to a set ratio. The mixing fragment chamber is connected to the aqueous solution injection port so that the water-soluble membrane fragments are mixed with the aqueous solution to form a water-soluble membrane fragment slurry, which is output from the output pipeline; the water-soluble membrane fragment slurry accounts for 15% to 20% of the short fiber pulp.

2. The mixing process method for high-consistency pulp according to claim 1, characterized in that, The step S101 is followed by: Step S201: Clean the residue in the short fiber pulp by using a high-concentration slag remover connected to the conveying pipeline of the short fiber pulp. Step S202: Install a thickener and a flow meter on the conveying pipeline to measure the concentration and flow rate of the short fiber pulp in the conveying pipeline; if the current concentration and flow rate are greater than the set threshold, send control information to adjust the concentration and flow rate. Step S203: The short fiber pulp is ground using a double circular screen thickener.

3. The mixing process method for high-consistency pulp according to claim 1, characterized in that, Step S103 includes: the polishing pad is two parallel circular polishing pads; a certain gap is provided between the two polishing pads; Among them, on the opposite surfaces of the abrasive pad, abrasive grooves are provided on the abrasive pad; the abrasive grooves extend outward from the center of the abrasive pad along a spiral trajectory; The short fiber pulp concentration is 15-25%.

4. The mixing process method for high-consistency pulp according to claim 1, characterized in that, The step S101 is followed by step S301, in which short fiber pulp is extracted from the short fiber pre-pulverizing tank by the second pumping pump and output to the outside through the second pipeline. Step S302: Install a second concentration meter and a second flow meter in the second pipeline; Step S303: If the short fiber pulp measured by the second thickener and the second flow meter in the current second pipeline is the set concentration of low-concentration pulp, then control the second pipeline to output the short fiber pulp to the low-concentration refiner; the low-concentration pulp is refined by the refining disc. Step S304: The low-concentration refiner refines the short fiber pulp to obtain a low-concentration short fiber pulp. Step S305: The low-concentration short fiber pulp is injected into a low-concentration grinding tank and allowed to stand.

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