System for improving cleanliness of recycled paper
By adding a fiber purification unit and a fiber sizing unit for the surface layer sizing and sizing purification unit for the surface layer during the production process of recycled paper, and using multiple sand removal and screening treatment technologies, the problem of incomplete removal of impurities in recycled paper is solved, which significantly improves the cleanliness of the paper surface and the service life of the fabric.
Patent Information
- Application Number
- CN202420985214.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-05-09
AI Technical Summary
In the prior art, various heavy impurities, such as sand, will be stored in the recycling process of waste paper, such as sand, and the existing pulp production process has not been processed in a targeted manner, making it difficult to meet the process requirements of recycled papermaking.
It provides a system for improving the cleanliness of recycled paper, including a fiber purification unit in the surface layer sizing and a surface layer sizing purification unit. The two additional purification devices are further removed from small volumes of impurities in the surface layer slurry system, including pulpers, sand detergents, coarse screens, grading screens, sand removal units, fine screens and multiple disks, and performs multiple sand removal and screening treatments.
Through the use of this system, the cleanliness of the paper-forming surface can be effectively improved, the wear and pollution caused by impurities such as sand and other impurities of the mesh pressed fabric are slowed down, and the service life of the fabric is extended.
Smart Images
Figure CN222781863U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pulping and papermaking, in particular to a system for improving the cleanliness of recycled paper. Background Art
[0002] Waste paper, also known as "secondary fiber", refers to recyclable resources that are discarded after use in production and life. my country consumes a large amount of various papers every year. If waste paper is discarded, it will cause a huge waste of resources. Waste paper recycling not only reduces the consumption of wood, but also significantly reduces the energy consumed in the production process of recycled paper. Its cost and environmental protection treatment fee are also relatively low. Therefore, waste paper recycling has attracted the attention of more and more manufacturers.
[0003] Recycled paper is made from waste paper as the main raw material, which is crushed, decolorized and pulped through various processes. 80% of its raw materials come from recycled waste paper, which is known as low-energy, low-pollution environmentally friendly paper. Therefore, recycled paper is usually processed and reused using pulp purification equipment.
[0004] However, the high impurity content in the raw materials of recycled paper affects the appearance of the paper surface. After the screening stage, only large impurities in the pulp, such as fiber bundles, rope ends, plastic foam, etc., can be removed. The removal effect of small impurities with high density, such as sand particles and metal fragments, is poor. Utility Model Content
[0005] To this end, the technical problem to be solved by the utility model is to overcome the problem that various heavy impurities, such as sand, are present in the process of recycling waste paper to produce recycled paper in the prior art, and the existing pulp production process does not specifically treat them cleanly, making it difficult to meet the process requirements of recycled papermaking.
[0006] In order to solve the above technical problems, the utility model provides a system for improving the cleanliness of recycled paper, comprising: a surface layer sizing medium fiber purification unit and a surface layer sizing purification unit, wherein the surface layer sizing purification unit is arranged after the process of the surface layer sizing medium fiber purification unit, the surface layer sizing medium fiber purification unit is used to purify the medium fibers in the surface layer slurry, and the surface layer sizing purification unit is used to further purify the slurry; the surface layer sizing medium fiber purification unit comprises a pulper, a first desander, a first coarse screen, a first grading screen, a first desander unit, a first fine screen and a second desander unit, the pulper, the first desander, the first coarse screen and the first grading screen are connected in sequence, the first grading screen is used to separate a primary long fiber slurry, the first desander unit performs a first impurity removal on the primary long fiber slurry, the first fine screen is used to screen the primary long fiber slurry to form a secondary long fiber slurry and medium fiber slurry, and the second desander unit performs a second impurity removal on the medium fiber slurry. The utility model provides a system for improving the cleanliness of recycled paper, which can effectively improve the cleanliness of the finished paper surface by further removing small impurities in the surface pulping system through two additional purification devices; it can effectively reduce the wear and pollution of the fabric of the screen pressing part caused by impurities such as sand particles, and extend the service life of the fabric.
[0007] In one embodiment of the present invention, the first desander unit includes a first-stage desander one, a second-stage desander one, a third-stage desander one and a fourth-stage desander one, the primary long fiber slurry is input into the first-stage desander one, and the first-stage desander one, the second-stage desander one, the third-stage desander one and the fourth-stage desander one are arranged in sequence.
[0008] In one embodiment of the utility model, the good slurry in the four-stage desander one is transported into the three-stage desander one, the good slurry in the three-stage desander one is transported into the two-stage desander one, the good slurry in the two-stage desander one is transported into the one-stage desander one, and the good slurry in the one-stage desander one is transported into the one-stage desander one.
[0009] In one embodiment of the present invention, the second desander unit includes a first-stage desander 2 and a second-stage desander 2, the medium fiber slurry is transported into the first-stage desander 2, the tail slurry of the first-stage desander 2 is transported into the second-stage desander 2, and the tail slurry of the second-stage desander 2 is transported into the third-stage desander 1.
[0010] In one embodiment of the present invention, the good slurry in the second-stage desander is transported into the first-stage desander.
[0011] In one embodiment of the utility model, the surface layer sizing medium fiber purification unit also includes a first medium fiber multi-disc, a first medium fiber heat disperser and a first medium fiber disc mill. The first medium fiber multi-disc is arranged after the process of the second sand removal unit. The first medium fiber multi-disc, the first medium fiber heat disperser and the first medium fiber disc mill are arranged in sequence. The first medium fiber disc mill is used to form a surface layer slurry.
[0012] In one embodiment of the utility model, the surface layer sizing purification unit includes a first stage desander three, a second stage desander three, a third stage desander three and a fourth stage desander three, and the first stage desander three, the second stage desander three, the third stage desander three and the fourth stage desander three are arranged in sequence, and the first stage desander three is used to receive the surface layer slurry in the surface layer sizing fiber purification unit.
[0013] In one embodiment of the utility model, the good slurry in the four-stage desander three is transported into the three-stage desander three, the good slurry in the three-stage desander three is transported into the two-stage desander three, and the good slurry in the two-stage desander three is transported into the one-stage desander three.
[0014] In one embodiment of the present invention, the surface sizing purification unit further includes a second grading screen, and the second grading screen is arranged after the third process of the four-stage desander.
[0015] In one embodiment of the present invention, the surface sizing purification unit further comprises a flow pressure screen, and the flow pressure screen is arranged after the third process of the first stage desander.
[0016] The above technical solution of the utility model has the following beneficial effects compared with the prior art:
[0017] The system for improving the cleanliness of recycled paper described in the utility model performs two-stage purification on the middle fibers of the surface layer slurry, namely the first sand removal unit and the second sand removal unit, and four-stage purification on the surface layer slurry, and utilizes the desander to separate waste impurities from fibers through centrifugal force to further purify the slurry, thereby reducing impurities in the surface layer slurry. The tail slurry enters the long-line system to avoid fiber loss, and the short fibers are refined by disc grinding to loosen the fibers, so that the bottom slurry also maintains a certain cleanliness, thereby achieving the purpose of improving the cleanliness of the finished paper surface. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein
[0019] Figure 1 It is a schematic diagram of a fiber purification unit in surface sizing in a preferred embodiment of the utility model;
[0020] Figure 2It is a schematic diagram of the surface sizing purification unit in the preferred embodiment of the utility model.
[0021] Explanation of the reference numerals in the specification: surface sizing medium fiber purification unit 100, surface sizing purification unit 200, pulper 1, first desander 2, first coarse screen 3, first grading screen 4, first desander unit 5, first fine screen 6, second desander unit 7, first stage desander 1 8, second stage desander 1 9, third stage desander 1 10, fourth stage desander 1 11, first stage desander 2 12, second stage desander 2 13, first medium fiber multi-disc 14, first medium fiber heat disperser 15, first medium fiber disc mill 16, first stage desander 3 17, second stage desander 3 18, third stage desander 3 19, fourth stage desander 3 20, second grading screen 21, flow pressure screen 22. DETAILED DESCRIPTION
[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.
[0023] Reference Figure 1 , 2 As shown, the system for improving the cleanliness of recycled paper of the utility model comprises: a surface layer sizing middle fiber purification unit 100 and a surface layer sizing purification unit 200, wherein the surface layer sizing middle fiber purification unit 200 is arranged after the process of the surface layer sizing middle fiber purification unit 100, the surface layer sizing middle fiber purification unit 100 is used to purify the middle fibers in the surface layer slurry, and the surface layer sizing purification unit 200 is used to further purify the slurry.
[0024] Reference Figure 1 As shown, the surface sizing medium fiber purification unit 100 includes a pulper 1, a first desander 2, a first coarse screen 3, a first grading screen 4, a first desander unit 5, a first fine screen 6 and a second desander unit 7. The pulper 1, the first desander 2, the first coarse screen 3 and the first grading screen 4 are connected in sequence. The first grading screen 4 is used to separate a primary long fiber pulp, the first desander unit 5 performs the first impurity removal on the primary long fiber pulp, the first fine screen 6 is used to screen the primary long fiber pulp to form a secondary long fiber pulp and medium fiber pulp, and the second desander unit 7 performs the second impurity removal on the medium fiber pulp.
[0025] In the above structure, the first desander unit 5 includes a first stage desander 8, a second stage desander 9, a third stage desander 10 and a fourth stage desander 11. The primary long fiber slurry is input into the first stage desander 8, and the first stage desander 8, the second stage desander 9, the third stage desander 10 and the fourth stage desander 11 are arranged in sequence. The good slurry in the fourth stage desander 11 is transported into the third stage desander 10, the good slurry in the third stage desander 10 is transported into the second stage desander 9, the good slurry in the second stage desander 9 is transported into the first stage desander 8, and the good slurry in the first stage desander 8 is transported into the first stage desander 8.
[0026] In the above structure, the second desander unit 7 includes a first stage desander 2 12 and a second stage desander 2 13, the medium fiber slurry is transported into the first stage desander 2 12, the tail slurry of the first stage desander 2 12 is transported into the second stage desander 2 13, and the tail slurry of the second stage desander 2 13 is transported into the third stage desander 1 10. The good slurry in the second stage desander 2 13 is transported into the first stage desander 2 12.
[0027] In addition, the surface layer sizing medium fiber purification unit 100 also includes a first medium fiber multi-disc 14, a first medium fiber heat disperser 15 and a first medium fiber disc mill 16. The first medium fiber multi-disc 14 is arranged after the process of the second sand removal unit 7. The first medium fiber multi-disc 14, the first medium fiber heat disperser 15 and the first medium fiber disc mill 16 are arranged in sequence. The first medium fiber disc mill 16 is used to form a surface layer slurry.
[0028] In the above-mentioned surface sizing medium fiber purification unit 100, the medium fibers screened out by the fine screen directly enter the heat dispersion from the multi-discs and directly enter the slurry preparation pool via the disc grinding. In addition, a two-stage purification and desander is added in front of the multi-discs, namely the first desander unit 5 and the second desander unit 7, to purify the medium fibers in the surface slurry.
[0029] Reference Figure 2 As shown, the surface sizing purification unit 200 includes a first stage desander 3 17, a second stage desander 3 18, a third stage desander 3 19 and a fourth stage desander 3 20, which are arranged in sequence, and the first stage desander 3 17 is used to receive the surface sizing material in the surface sizing fiber purification unit 100. The good slurry in the fourth stage desander 3 20 is transported into the third stage desander 3 19, the good slurry in the third stage desander 3 19 is transported into the second stage desander 3 18, and the good slurry in the second stage desander 3 18 is transported into the first stage desander 3 17.
[0030] In addition, the surface sizing purification unit 200 further includes a second grading screen 21 and a flow pressure screen 22. The second grading screen 21 is arranged after the fourth stage desander three 20 process. The flow pressure screen 22 is arranged after the first stage desander three 17 process.
[0031] The surface sizing purification unit 200 is provided with a four-stage purification and sand removal device before the surface sizing to further purify the slurry on the screen.
[0032] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.
Claims
1. A system for improving the cleanliness of recycled paper, characterized in that: include: A surface layer sizing middle fiber purification unit and a surface layer sizing purification unit, wherein the surface layer sizing purification unit is arranged after the process of the surface layer sizing middle fiber purification unit, the surface layer sizing middle fiber purification unit is used to purify the middle fiber in the surface layer sizing, and the surface layer sizing purification unit is used to further purify the slurry; The surface sizing medium fiber purification unit comprises a pulper, a first desander, a first coarse screen, a first grading screen, a first desander unit, a first fine screen and a second desander unit. The pulper, the first desander, the first coarse screen and the first grading screen are connected in sequence. The first grading screen is used to separate a primary long fiber pulp. The first desander unit performs a first impurity removal on the primary long fiber pulp. The first fine screen is used to screen the primary long fiber pulp to form a secondary long fiber pulp and a medium fiber pulp. The second desander unit performs a second impurity removal on the medium fiber pulp.
2. The system for improving the cleanliness of recycled paper according to claim 1, characterized in that: The first desander unit includes a first-stage desander one, a second-stage desander one, a third-stage desander one and a fourth-stage desander one, the primary long fiber slurry is input into the first-stage desander one, and the first-stage desander one, the second-stage desander one, the third-stage desander one and the fourth-stage desander one are arranged in sequence.
3. The system for improving the cleanliness of recycled paper according to claim 2, characterized in that: The good slurry in the four-stage desander is transported into the three-stage desander, the good slurry in the three-stage desander is transported into the two-stage desander, the good slurry in the two-stage desander is transported into the one-stage desander, and the good slurry in the one-stage desander is transported into the one-stage desander.
4. The system for improving the cleanliness of recycled paper according to claim 2, characterized in that: The second desander unit includes a first-stage desander 2 and a second-stage desander 2. The medium fiber slurry is transported into the first-stage desander 2, the tail slurry of the first-stage desander 2 is transported into the second-stage desander 2, and the tail slurry of the second-stage desander 2 is transported into the third-stage desander 1.
5. The system for improving the cleanliness of recycled paper according to claim 4, characterized in that: The good slurry in the second-stage desander is transported into the first-stage desander.
6. The system for improving the cleanliness of recycled paper according to claim 1, characterized in that: The surface layer sizing medium fiber purification unit also includes a first medium fiber multi-disc, a first medium fiber heat disperser and a first medium fiber disc mill. The first medium fiber multi-disc is arranged after the process of the second sand removal unit. The first medium fiber multi-disc, the first medium fiber heat disperser and the first medium fiber disc mill are arranged in sequence. The first medium fiber disc mill is used to form the surface layer slurry.
7. The system for improving the cleanliness of recycled paper according to claim 6, characterized in that: The surface layer sizing purification unit includes a first-stage desander three, a second-stage desander three, a third-stage desander three and a fourth-stage desander three, and the first-stage desander three, the second-stage desander three, the third-stage desander three and the fourth-stage desander three are arranged in sequence, and the first-stage desander three is used to receive the surface layer slurry in the surface layer sizing fiber purification unit.
8. The system for improving the cleanliness of recycled paper according to claim 7, characterized in that: The good slurry in the four-stage desander three is transported into the three-stage desander three, the good slurry in the three-stage desander three is transported into the two-stage desander three, and the good slurry in the two-stage desander three is transported into the one-stage desander three.
9. The system for improving the cleanliness of recycled paper according to claim 8, characterized in that: The surface sizing purification unit also includes a second grading screen, which is arranged after the third process of the four-stage desander.
10. The system for improving the cleanliness of recycled paper according to claim 9, characterized in that: The surface sizing purification unit further comprises a flow pressure screen, and the flow pressure screen is arranged after the third process of the first stage desander.