Preparation method of raw paper pulp of paper for daily use

Abstract

The invention belongs to the technical field of household paper production, and relates to a household paper raw paper pulp preparation method, which comprises: S1, constructing and connecting an ultra-low whiteness wood pulp supply system on an original household paper production system; s2, mixing the ultra-low-whiteness wood pulp with original wood pulp of an original household paper production system; s3, controlling the pulp preparation proportion of the ultralow-whiteness wood pulp to be 0.2%-1.0% during mixing; s4, controlling the flow rate of the ultra-low-whiteness wood pulp according to the concentration of the ultra-low-whiteness wood pulp and the flow rate and concentration of the original wood pulp; and S5, feeding the mixed ultra-low-whiteness wood pulp and original wood pulp into an original household paper production system, and producing the household paper of which the whiteness and the dust point both meet the national standard requirements through a subsequent process. According to the method, the ultra-low-whiteness pulp board can be used for producing the body paper, and the requirements of the national standard for whiteness and dust spots are met.

Description

Technical Field

[0001] The invention belongs to the technical field of household paper production and relates to a method for preparing base pulp for household paper. Background Art

[0002] At present, the whiteness of mainstream commercial wood pulp is generally around 89%. After entering the household paper mill, these wood pulps need to be further pulped and mixed, and the whiteness of the pulp will increase slightly after these processes. However, the current national standard for household paper (including toilet paper, paper towels, kitchen paper, hand towels, etc.) requires the D65 brightness (whiteness) standard to be ≤90.0%. As mentioned above, because the original whiteness of ordinary commercial pulp is relatively high, generally around 89%, the whiteness of the pulp increases after the household paper mill performs pulping and other processing stages, and there is a risk that the whiteness of the finished product produced will reach the upper limit of the national standard requirements or exceed the national standard requirements.

[0003] At present, in order to solve this problem, the commonly used method is to purchase low-whiteness commercial pulp board and use it with ordinary commercial pulp board. This method can effectively reduce the whiteness of the product. However, the low-whiteness commercial pulp board is used in large quantities and contains a large number of dust points, causing the dust points in the finished household paper products to exceed the national standard requirements, so it cannot be used in large quantities. The reason is that the low-whiteness commercial pulp board contains a large number of small-sized dark brown impurities and a small number of impurities with a size of ≥2.0mm, and the conventional household papermaking system cannot remove these impurities. Therefore, it is difficult for the use of low-whiteness pulp board in the production of household paper to meet the national standard requirements for whiteness and dust points. Summary of the invention

[0004] The object of the present invention is to solve the above-mentioned problem and provide a method for preparing base pulp for daily paper.

[0005] To achieve the above object, the present invention provides a method for preparing base pulp for household paper, comprising:

[0006] S1. Build and connect the ultra-low whiteness wood pulp supply system on the original household paper production system;

[0007] S2, mixing the ultra-low brightness wood pulp with the original wood pulp from the original household paper production system;

[0008] S3. When mixing, the proportion of ultra-low whiteness wood pulp is controlled to be 0.2%-1.0%;

[0009] S4, controlling the flow rate of the ultra-low brightness wood pulp according to the concentration of the ultra-low brightness wood pulp and the flow rate and concentration of the original wood pulp;

[0010] S5. Send the mixed ultra-low whiteness wood pulp and original wood pulp to the original household paper production system for subsequent processes to produce household paper whose whiteness and dust point meet the national standards.

[0011] Furthermore, the original household paper production system includes a connected original wood pulp pool, a paddle mixer, a paddle pool and a papermaking section.

[0012] Furthermore, the ultra-low whiteness wood pulp supply system includes an ultra-low white pulp crusher and a paddle pump connected in sequence, and also includes a white water pool and a paddle crushing water supply pump and a paddle cleaning pump connected to the white water pool respectively, and the paddle crushing water supply pump is connected to the ultra-low white pulp crusher;

[0013] The white water pool is connected to the purification propeller pump through a pipeline, and the propeller pump is connected to the pipeline.

[0014] Furthermore, the purification impeller pump outlet is connected to a purification pressure screen, and the purification pressure screen is respectively connected to an ultra-low white pulp tank and a wastewater treatment and recovery equipment. The concentrated water produced by the purification pressure screen is sent to the wastewater treatment and recovery equipment, and the good impeller passing through the purification pressure screen is sent to the ultra-low white pulp tank.

[0015] Furthermore, the ultra-low white propeller tank is connected to an ultra-low white propeller auxiliary propeller pump, and the ultra-low white propeller auxiliary propeller pump is connected to the propeller mixer through a pipeline;

[0016] The pipelines are respectively provided with an ultra-low white slurry flow meter and an ultra-white slurry concentration meter.

[0017] Furthermore, the purification pressure screen is used to remove impurities with a length greater than 1 mm.

[0018] Furthermore, the whiteness of the ultra-low whiteness wood pulp is 43%-46%.

[0019] Furthermore, the distribution ratio of the ultra-low white propeller distribution pump is D, the ultra-low white propeller distribution flow is Q1, the ultra-low white propeller distribution concentration is c1, the original distribution flow is Q2, and the original distribution concentration is c2, then it satisfies: Q1 = Q2 × c2 × D ÷ c1.

[0020] The beneficial effects of the present invention are as follows:

[0021] The method for preparing base pulp for daily life paper of the present invention can use ultra-low whiteness pulp board to produce base paper that meets the requirements of national standards for whiteness and dust point. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A process flow chart schematically showing a method for preparing base pulp for household paper according to the present invention;

[0023] Figure 2 The figure schematically shows the ultra-low white propeller matching system according to the present invention.

[0024] The meanings of the symbols in the accompanying drawings are as follows:

[0025] 1. Original wood pulp pool; 2. Paddle mixer; 3. Paddle pool; 4. Papermaking section; 5. Ultra-low white pulp crusher; 6. Paddle pump; 7. White water pool; 8. Paddle breaking water supply pump; 9. Purification and propeller pump; 10. Purification pressure screen; 11. Ultra-low white pulp tank; 12. Wastewater treatment and recovery equipment; 13. Ultra-low white pulp propeller pump; 14. Ultra-low white pulp flowmeter; 15. Ultra-low white pulp concentration meter. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0028] Combination Figure 1 and Figure 2 As shown, the present invention provides a method for preparing base pulp for daily use paper, comprising: S1, constructing an ultra-low whiteness wood pulp supply system connected to the original daily use paper production system; S2, mixing the ultra-low whiteness wood pulp with the original wood pulp of the original daily use paper production system; S3, controlling the proportion of the ultra-low whiteness wood pulp to be 0.2%-1.0% during mixing; S4, controlling the flow rate of the ultra-low whiteness wood pulp according to the concentration of the ultra-low whiteness wood pulp and the flow rate and concentration of the original wood pulp; S5, sending the mixed ultra-low whiteness wood pulp and the original wood pulp to the subsequent process in the original daily use paper production system to produce daily use paper whose whiteness and dust point meet the national standard requirements. Among them, the proportion of the ultra-low white pulp mixing pump is D, the ultra-low white pulp mixing flow rate is Q1, the ultra-low white pulp mixing concentration is c1, the original mixing flow rate is Q2, and the original mixing concentration is c2, then it satisfies: Q1=Q2×c2×D÷c1.

[0029] In the present invention, the original household paper production system includes an original wood pulp pool 1, a paddle mixer 2, a paddle pool 3 and a papermaking section 4 connected to each other. The ultra-low whiteness wood pulp supply system includes an ultra-low white pulp crusher 5 and a paddle pump 6 connected in sequence, and also includes a white water pool 7 and a paddle crushing water supply pump 8 and a paddle cleaning pump 9 respectively connected to the white water pool 7. The paddle crushing water supply pump 8 is connected to the ultra-low white pulp crusher 5, the white water pool 7 is connected to the paddle cleaning pump 9 through a pipeline, and the paddle cleaning pump 6 is connected to the pipeline. The outlet of the paddle cleaning pump 9 is connected to a purification pressure screen 10, and the purification pressure screen 10 is respectively connected to an ultra-low white pulp tank 11 and a wastewater treatment and recovery device 12. The concentrated water produced by the purification pressure screen 10 is sent to the wastewater treatment and recovery device 12, and the good pulp passed through the purification pressure screen 10 is sent to the ultra-low white pulp tank 11. The ultra-low white slurry tank 11 is connected to an ultra-low white slurry propeller pump 13, and the ultra-low white slurry propeller pump 13 is connected to the mixer 2 through a pipeline, and an ultra-low white slurry flowmeter 14 and an ultra-low white slurry concentration meter 15 are respectively provided on the pipeline.

[0030] The method for preparing base pulp for daily life paper of the present invention comprises the following steps: the ultra-low whiteness wood pulp is a natural color pulp board with a white base of 43%-46%, and the pulp board contains a large amount of impurities or dark brown fibers with a length of ≥2mm and dust spots with a size of ≤2mm.

[0031] The specific process of the method for preparing base pulp for daily use paper of the present invention is as follows:

[0032] 1. Preparation of ultra-low brightness wet pulp: The ultra-low brightness pulp board purchased by the factory is put into the ultra-low brightness crusher 5, and at the same time, a certain amount of white water in the white water pool 7 is pumped into the ultra-low white pulp crusher 5 through the pulp crushing water supply pump 8 to crush the pulp, and the ultra-low brightness wet pulp is obtained by crushing, and stored in the ultra-low brightness crusher 5 for standby use;

[0033] Purification of ultra-low whiteness wet pulp: Turn on the purification flushing pump 9 to pump the white water in the white water pool to the purification pressure screen, and at the same time turn on the paddle pump 6 to pump the wet pulp stored in the ultra-low white pulp crusher to the inlet of the purification flushing pump to merge with the white water, and then the good pulp obtained by the purification pressure screen 10 is introduced into the ultra-low white pulp tank 11, and the obtained concentrated water is discharged to the wastewater treatment and recovery equipment 12. According to one embodiment of the present invention, the purification pressure screen 10 is used to remove impurities with a length greater than 1 mm.

[0034] 3. Ultra-low whiteness wet pulp preparation: According to the whiteness requirement of the base paper to be produced, the preparation ratio D of the ultra-low white pulp preparation pump is set. The program automatically calculates the required ultra-low whiteness wet pulp preparation flow Q1 according to the original preparation flow Q2, the original preparation concentration c2, and the ultra-low whiteness wet pulp preparation concentration c1 read by the ultra-low whiteness concentration meter 15 according to the formula Q1=Q2×c2×D÷c1, and controls the ultra-low white pulp preparation pump 13 through interlocking to stabilize the preparation flow Q1, which can be checked according to the ultra-low white pulp flow meter 14. The ultra-low white pulp preparation pump 13 also pumps the ultra-low white pulp to the original mixer 2 in the workshop to mix with the original wood pulp. The original wood pulp comes from the original original wood pulp pool 1 in the workshop. According to one embodiment of the present invention, the original wood pulp pool can be a coniferous wood pulp tapping paddle pool and / or a broadleaf wood pulp tapping paddle pool, etc.

[0035] 4. Papermaking and Inspection: Papermaking and inspection are for the base paper of daily life paper made by the original equipment and technology of each daily life paper production factory. The whiteness and dust point index of the base paper are obtained through inspection.

[0036] The following is a specific example of the method for preparing base pulp for household paper of the present invention:

[0037] Example 1: Production of household paper base paper with a whiteness of 89.0%.

[0038] (I) Preparation of ultra-low whiteness wet pulp: a certain brand of ultra-low whiteness pulp purchased by the factory, the whiteness of which is 45%, is put into the ultra-low white pulp crusher 5, and at the same time, a certain amount of white water in the white water tank 7 is pumped into the ultra-low white pulp crusher 5 through the pulping water supply pump 8 for pulp crushing, and ultra-low whiteness wet pulp is obtained by crushing, and stored in the ultra-low white pulp crusher 5 for standby use;

[0039] (ii) Purification of ultra-low whiteness wet pulp: start the purification pump 9 to pump the white water in the white water pool 7 to the purification pressure screen 10, and at the same time start the pulp pump 6, the wet pulp stored in the ultra-low white pulp crusher is pumped to the inlet of the purification pump 9 to merge with the white water, the good pulp obtained by the purification pressure screen 10 is introduced into the ultra-low white pulp tank 11 for storage, and the obtained concentrated water is discharged to the original wastewater recovery place of the workshop;

[0040] (III) Preparation of ultra-low whiteness wet pulp: According to the whiteness requirement of the base paper to be produced, the preparation ratio D of the ultra-low white pulp preparation pump is set to 0.2%. The program sets the original preparation flow rate Q2 to 90m 3 / h, the original stock concentration c2 is 3.5%, the ultra-low brightness wet pulp stock concentration c1 read by the concentration meter is 1%, according to the formula Q1 = Q2 × c2 × D ÷ c1, the required ultra-low brightness wet pulp stock flow rate Q1 is automatically calculated to be 0.63m3 / h, and through interlocking control of the ultra-low white pulp mixing pump 13, the mixing flow rate is stabilized to Q1, and the ultra-low white pulp is pumped to the original mixer 2 in the workshop to be mixed with the original pulp;

[0041] (IV) Papermaking and Inspection: Papermaking and inspection are for the base paper of household paper made by the original equipment and technology of each household paper production factory. The inspection shows that the whiteness of the base paper is 88.94%, and the total number of dust spots is 1 / ㎡, among which the number of dust spots with a size of 0.2-1.0mm is 1 / ㎡, the number of dust spots with a size of 1.0-2.0mm is 0 / ㎡, and there are no dust spots larger than 2.0mm. The above two indicators meet the national standard requirements for all household papers.

[0042] Example 2: Production of household paper base paper with a whiteness of 88.5%.

[0043] (i) Preparation of ultra-low whiteness wet pulp: ultra-low whiteness pulp purchased by the factory, with a whiteness of 45% detected, is put into the ultra-low white pulp crusher 5, and a certain amount of white water in the white water pool 7 is pumped into the ultra-low white pulp crusher 5 through the pulping water supply pump 8 for pulp crushing, and ultra-low whiteness wet pulp is obtained by crushing, and stored in the ultra-low white pulp crusher 5 for standby use;

[0044] (ii) Purification of ultra-low whiteness wet pulp: Turn on the purification pump 9 to pump the white water in the white water pool 7 to the purification pressure screen 10, and turn on the pulp pump 6 at the same time. The wet pulp stored in the ultra-low white pulp crusher is pumped to the inlet of the purification pump 9 to merge with the white water. The good pulp obtained by the purification pressure screen 10 is introduced into the ultra-low white pulp tank 11 for storage, and the obtained concentrated water is discharged to the original wastewater recovery place of the workshop;

[0045] (III) Preparation of ultra-low whiteness wet pulp: According to the whiteness requirement of the base paper to be produced, the preparation ratio D of the ultra-low white pulp preparation pump is set to 0.6%. The program sets the original preparation flow rate Q2 to 90m 3 / h, the original stock concentration c2 is 3.5%, the ultra-low brightness wet pulp stock concentration c1 read by the concentration meter is 1%, according to the formula Q1 = Q2 × c2 × D ÷ c1, the required ultra-low brightness wet pulp stock flow rate Q1 is automatically calculated to be 1.89m 3 / h, and through interlocking control of the ultra-low white pulp mixing pump 13, the mixing flow rate is stabilized to Q1, and the ultra-low white pulp is pumped to the original mixer 2 in the workshop to be mixed with the original pulp;

[0046] (IV) Papermaking and Inspection: Papermaking and inspection are for the base paper of household paper made by the original equipment and technology of each household paper production factory. The inspection shows that the whiteness of the base paper is 88.43%, and the total number of dust spots is 2 / ㎡, of which the number of dust spots with a size of 0.2-1.0mm is 2 / ㎡, the number of dust spots with a size of 1.0-2.0mm is 0 / ㎡, and there is no dust spot larger than 2.0mm. The above two indicators meet the national standard requirements for all household paper.

[0047] Example 3: Production of household paper base paper with a whiteness of 88.0%.

[0048] (i) Preparation of ultra-low whiteness wet pulp: ultra-low whiteness pulp purchased by the factory, with a whiteness of 45% detected, is put into the ultra-low white pulp crusher 5, and a certain amount of white water in the white water pool 1 is pumped into the ultra-low white pulp crusher 5 through the pulping water supply pump 8 for pulp crushing, and ultra-low whiteness wet pulp is obtained by crushing, and stored in the ultra-low white pulp crusher 5 for standby use;

[0049] (ii) Purification of ultra-low whiteness wet pulp: Turn on the purification pump 9 to pump the white water in the white water pool 7 to the purification pressure screen 10, and turn on the pulp pump 6 at the same time. The wet pulp stored in the ultra-low white pulp crusher is pumped to the inlet of the purification pump 9 to merge with the white water. The good pulp obtained by the purification pressure screen 10 is introduced into the ultra-low white pulp tank 11 for storage, and the obtained concentrated water is discharged to the original wastewater recovery place of the workshop;

[0050] (III) Preparation of ultra-low whiteness wet pulp: According to the whiteness requirement of the base paper to be produced, the preparation ratio D of the ultra-low white pulp preparation pump is set to 1.0%. The program sets the original preparation flow rate Q2 to 90m 3 / h, the original stock concentration c2 is 3.5%, the ultra-low brightness wet pulp stock concentration c1 read by the concentration meter is 1%, according to the formula Q1 = Q2 × c2 × D ÷ c1, the required ultra-low brightness wet pulp stock flow rate Q1 is automatically calculated to be 3.15m 3 / h, and through interlocking control of the ultra-low white pulp mixing pump 13, the mixing flow rate is stabilized to Q1, and the ultra-low white pulp is pumped to the original mixer 2 in the workshop to be mixed with the original pulp;

[0051] (IV) Papermaking and Inspection: Papermaking and inspection are for the base paper of household paper made by the original equipment and technology of each household paper production factory. The inspection shows that the whiteness of the base paper is 87.91%, and the total number of dust spots is 3 / ㎡, among which the number of dust spots with a size of 0.2-1.0mm is 3 / ㎡, the number of dust spots with a size of 1.0-2.0mm is 0 / ㎡, and there is no dust spot larger than 2.0mm. The above two indicators meet the national standard requirements for all household paper.

[0052] The method for preparing base pulp for daily life paper of the present invention can use ultra-low whiteness pulp board to produce base paper that meets the national standard requirements for whiteness and dust point. At the same time, the process and control are simple, and the whiteness can be instantly controlled by fine-tuning the flow rate of ultra-low white pulp.

[0053] The above is only one embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing base pulp for household paper, comprising: S1. Build and connect the ultra-low whiteness wood pulp supply system on the original household paper production system; S2, mixing the ultra-low brightness wood pulp with the original wood pulp from the original household paper production system; S3. When mixing, the proportion of ultra-low whiteness wood pulp is controlled to be 0.2%-1.0%; S4, controlling the flow rate of the ultra-low brightness wood pulp according to the concentration of the ultra-low brightness wood pulp and the flow rate and concentration of the original wood pulp; S5. Send the mixed ultra-low whiteness wood pulp and original wood pulp to the original household paper production system for subsequent processes to produce household paper whose whiteness and dust point meet the national standards.

2. The method for preparing base pulp for household paper according to claim 1, characterized in that: The original household paper production system comprises an original wood pulp pool, a paddle mixer, a paddle pool and a papermaking section which are connected.

3. The method for preparing base pulp for household paper according to claim 2, characterized in that: The ultra-low whiteness wood pulp supply system comprises an ultra-low white pulp crusher and a paddle pump connected in sequence, and also comprises a white water pool and a paddle crushing water supply pump and a paddle cleaning pump respectively connected to the white water pool, wherein the paddle crushing water supply pump is connected to the ultra-low white pulp crusher; The white water pool is connected to the purification propeller pump through a pipeline, and the propeller pump is connected to the pipeline.

4. The method for preparing base pulp for household paper according to claim 3, characterized in that: The purification impeller pump outlet is connected to a purification pressure screen, and the purification pressure screen is respectively connected to an ultra-low white pulp tank and a wastewater treatment and recovery device. The concentrated water produced by the purification pressure screen is sent to the wastewater treatment and recovery device, and the good impeller passing through the purification pressure screen is sent to the ultra-low white pulp tank.

5. The method for preparing base pulp for household paper according to claim 4, characterized in that: The ultra-low white propeller tank is connected to an ultra-low white propeller auxiliary propeller pump, and the ultra-low white propeller auxiliary propeller pump is connected to the propeller mixer through a pipeline; The pipelines are respectively provided with an ultra-low white slurry flow meter and an ultra-white slurry concentration meter.

6. The method for preparing base pulp for household paper according to claim 5, characterized in that: The purification pressure screen is used to remove impurities with a length greater than 1 mm.

7. The method for preparing base pulp for household paper according to any one of claims 1 to 6, characterized in that: The ultra-low brightness wood pulp has a brightness of 43%-46%.

8. The method for preparing base pulp for household paper according to claim 5, characterized in that: The distribution ratio of the ultra-low white propeller pump is D, the ultra-low white propeller flow rate is Q1, the ultra-low white propeller concentration is c1, the original propeller flow rate is Q2, and the original propeller concentration is c2, then it satisfies: Q1=Q2×c2×D÷c1.

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