Paper dyeing production system and paper dyeing method

Abstract

The present invention discloses a paper dyeing production system and method, comprising: a paper feed device; a dyeing and drying assembly, comprising a dyeing device and a first drying device, the dyeing device comprising a first pressing roller and a second pressing roller, a first pulp reservoir formed between the upper side of the first pressing roller and the first paper surface of the paper, and a second pulp reservoir formed between the upper side of the second pressing roller and the second paper surface of the paper; and a paper discharge device. Paper to be dyed enters the dyeing device for dyeing. When the paper color needs to be switched, only the dyeing device and a few other structures need to be cleaned. Compared to cleaning papermaking equipment, this paper dyeing production system has a short cleaning downtime, significantly reduces water consumption and wastewater treatment, thereby enabling rapid switching to produce different colors of paper with low switching costs, and can meet the production needs of small batches of different colored paper.

Description

Technical Field

[0001] The present invention relates to the technical field of paper production, in particular to a paper dyeing production system and a paper dyeing method. Background Art

[0002] Traditionally, colored paper is manufactured during the papermaking process. Dyes of the desired color are added to the pulp and mixed in the papermaking equipment to produce paper products of the corresponding color. This method of producing colored paper has at least the following shortcomings: during production, the dyes will stain multiple devices in the papermaking equipment. If a different color of paper is required, production must be stopped and the entire papermaking equipment must be cleaned, significantly reducing production efficiency. Cleaning also requires a large amount of water, and the wastewater after cleaning must be treated to meet environmental protection requirements, resulting in high cleaning costs. Therefore, current methods for manufacturing colored paper are mostly suitable for mass production of the same color paper. When it is necessary to switch to producing different colors of paper, the switching cost is high, which is not conducive to meeting customers' needs for small quantities and differentiation. Summary of the Invention

[0003] The main purpose of the present invention is to propose a paper dyeing production system and a paper dyeing method, which aims to solve the technical problem of high switching cost when switching colors in the existing method of manufacturing colored paper.

[0004] To achieve the above object, the present invention provides a paper dyeing production system, comprising:

[0005] A paper feeding device for continuously feeding paper forward;

[0006] The dyeing and drying component is arranged at the front side of the paper feeding device, and the dyeing and drying component includes a dyeing device and a first drying device. The first drying device is arranged at the front side of the dyeing device, and the dyeing device includes a first dyeing frame, and the first dyeing frame is provided with a first pressing roller and a second pressing roller parallel to each other, and the axes of the first pressing roller and the second pressing roller are extended in the left-right direction. The first pressing roller and the second pressing roller are arranged front to back and close to each other, and the first pressing roller and the second pressing roller can pass through the paper from top to bottom and press the paper, and a first pulp storage tank is formed between the upper side of the first pressing roller and the first paper surface of the paper, and a second pulp storage tank is formed between the upper side of the second pressing roller and the second paper surface of the paper, and the first pulp storage tank can store the first dye pulp to dye the first paper surface. The second pulp storage tank is capable of storing a second dye pulp for dyeing the second paper surface. The dyeing device further includes two first end sealing plates and two second end sealing plates. The two first end sealing plates are respectively provided at the left and right ends of the first pulp storage tank, and the two second end sealing plates are respectively provided at the left and right ends of the second pulp storage tank. The first end sealing plates are used to block the first dye pulp at the left and right ends of the first pulp storage tank, and the second end sealing plates are used to block the second dye pulp at the left and right ends of the second pulp storage tank. The dyeing device further includes a first pulp feeding pipe and a second pulp feeding pipe. The first pulp feeding pipe is provided with a first pulp feeding port for adding the first dye pulp to the first pulp storage tank, and the second pulp feeding pipe is provided with a second pulp feeding port for adding the second dye pulp to the second pulp storage tank. The first drying device is used to dry the dyed paper;

[0007] A paper discharging device is arranged on the front side of the dyeing and drying component, and is used for delivering the dyed paper.

[0008] The paper to be dyed enters from the paper feeding device and is transported forward to the dyeing and drying component; the dyeing device includes two first pressing rollers and a second pressing roller, and the paper passes between the first pressing roller and the second pressing roller; the upper side of the first pressing roller and the first paper surface of the paper form a first pulp storage tank, and the first pulp feeding port of the first pulp feeding pipe can add the first dye pulp into the first pulp storage tank, and the two first end sealing plates block the first dye pulp at the left and right ends of the first pulp storage tank, so that the first dye pulp can be stored to a certain depth in the first pulp storage tank; the upper side of the second pressing roller and the second paper surface of the paper form a second pulp storage tank, and the first pulp feeding port of the first pulp feeding pipe can add the first dye pulp into the first pulp storage tank. The second slurry feeding port of the second slurry feeding pipe can add the second dye slurry into the second slurry storage tank, and the two second end sealing plates block the second dye slurry at the left and right ends of the second slurry storage tank, so that the second dye slurry can be stored to a certain depth in the second slurry storage tank; during the paper conveying process, the first dye slurry and the second dye slurry can be respectively attached to the first paper surface and the second paper surface of the paper for dyeing, and the dye slurry is made flatter on the paper surface under the mutual pressure of the first pressing roller and the second pressing roller; then the dyed paper enters the first drying device to dry the dye; finally, the paper is sent out from the paper discharge device to complete the dyeing.

[0009] This paper dyeing production system separates dyeing from the existing method of manufacturing colored paper. The paper that needs to be dyed enters the dyeing device for dyeing. When the paper color needs to be switched, only the dyeing device and a small number of other structures need to be cleaned. Compared with the existing papermaking equipment for cleaning, the paper dyeing production system has a short cleaning downtime, greatly reduces water consumption and wastewater treatment volume, thereby achieving rapid switching to produce paper of different colors with low switching costs, which can meet the production of small batches of paper of different colors. In addition, the colors of the first dye pulp and the second dye pulp can be the same or different, and the first dye pulp and the second dye pulp can be both added or one of them can be added to achieve dyeing of paper with a variety of different effects.

[0010] Preferably, the paper dyeing production system also includes a surface treatment drying component, which is arranged between the dyeing and drying component and the paper output device. The surface treatment drying component includes a surface treatment device and a second drying device, and the second drying device is arranged on the front side of the surface treatment device. The surface treatment device is used to apply a surface treatment agent to the surface of the dyed paper, and the second drying device is used to dry the paper after the surface treatment agent is applied.

[0011] The dyed paper enters the surface treatment drying component, and the surface treatment device applies a surface treatment agent to the surface of the dyed paper. The surface treatment agent can protect the surface of the dyed paper, and then the paper enters the second drying device to dry the surface treatment agent.

[0012] Preferably, the surface treatment device includes a surface treatment frame, on which a third pressure roller and a fourth pressure roller are provided parallel to each other, the axes of the third pressure roller and the fourth pressure roller both extend in the left-right direction, the third pressure roller and the fourth pressure roller are arranged front to back and close to each other, the third pressure roller and the fourth pressure roller can pass through the paper from top to bottom and press the paper, a third pulp storage tank is formed between the upper side of the third pressure roller and the first paper surface of the paper, and a fourth pulp storage tank is formed between the upper side of the fourth pressure roller and the second paper surface of the paper, the third pulp storage tank can store a surface treatment agent to apply the surface treatment agent to the first paper surface, and the fourth pulp storage tank can store a surface treatment agent to apply the surface treatment agent to the second paper surface.

[0013] The upper side of the third pressing roller and the first paper surface of the paper form a third pulp storage tank, and the upper side of the fourth pressing roller and the second paper surface of the paper form a fourth pulp storage tank. A surface treatment agent is added to the third pulp storage tank and the fourth pulp storage tank. During the transportation of the paper, the surface treatment agent can adhere to the first paper surface and the second paper surface, and the surface treatment agent is made smoother on the paper surface under the relative pressure of the third pressing roller and the fourth pressing roller.

[0014] Preferably, the first drying device includes a first drying rack, the first drying rack is provided with a plurality of first drying cylinders, the plurality of first drying cylinders are arranged in an up-and-down staggered manner from back to front, the first drying rack is further provided with a first drying net, the first drying net is wound around the plurality of first drying cylinders, paper can pass through between the plurality of first drying cylinders and dry the paper, and the first drying net is used to press the paper against the first drying cylinders;

[0015] The dyeing and drying assembly also includes a pre-drying device, which is arranged between the dyeing device and the first drying device. The pre-drying device is provided with a pre-drying chamber, which is used for the paper to pass through and be pre-dried before entering the first drying device.

[0016] The use of multiple primary drying cylinders improves drying efficiency while reducing the space occupied by the primary drying device. After dyeing, the paper is relatively moist. Directly passing it through the primary drying cylinders and primary drying nets can easily leave marks on the paper, resulting in an uneven surface. Therefore, the paper first passes through the pre-drying chamber of the pre-drying unit. This pre-drying chamber pre-dries the paper to reduce moisture without affecting the smoothness of the paper's surface, ensuring that no or minimal marks are left on the paper when it passes through the primary drying cylinders and primary drying nets.

[0017] Preferably, the dyeing device also includes two first material receiving troughs, which are respectively arranged on the lower side of the outer sides of the two first end sealing plates and the two second end sealing plates, and the first material receiving troughs are used to receive the first dyeing slurry overflowing from the upper side of the first end sealing plate in the first slurry storage tank and to receive the second dyeing slurry overflowing from the upper side of the second end sealing plate in the second slurry storage tank.

[0018] The first dyeing slurry and the second dyeing slurry are continuously added to the first slurry storage tank and the second slurry storage tank, and the liquid level of the first dyeing slurry reaches a height that overflows the first end sealing plate, and the liquid level of the second dyeing slurry reaches a height that overflows the second end sealing plate. The first dyeing slurry overflows from the upper side of the first end sealing plate and is received by the first material receiving trough, and the second dyeing slurry overflows from the upper side of the second end sealing plate and is received by the first material receiving trough. In this way, the liquid level of the first dyeing slurry in the first slurry storage tank is kept basically unchanged, and the liquid level of the second dyeing slurry in the second slurry storage tank is kept basically unchanged, so that the time for the paper to pass through the dyeing slurry and the dyeing effect remain basically the same, thereby improving the color consistency.

[0019] In another aspect, the present invention further provides a paper dyeing method using the above-mentioned paper dyeing production system, the paper dyeing method comprising the following steps:

[0020] S1: placing a paper roll to be dyed onto the paper feeding device, drawing the paper through between the first pressing roller and the second pressing roller, the first pressing roller and the second pressing roller pressing the paper, so that the first pulp reservoir is formed between the first paper surface of the paper and the upper side of the first pressing roller, and the second pulp reservoir is formed between the second paper surface of the paper and the upper side of the second pressing roller;

[0021] S2: the first slurry feeding port continuously adds the first dye slurry to the first slurry storage tank, so that the first dye slurry is stored in the first slurry storage tank and the first dye slurry exceeding the height of the first end sealing plate overflows from the upper side of the first end sealing plate to maintain the liquid level of the first dye slurry in the first slurry storage tank;

[0022] and / or, the second slurry feeding port continuously adds the second slurry to the second slurry storage tank, so that the second slurry is stored in the first slurry storage tank and the second slurry exceeds the height of the second end sealing plate and overflows from the upper side of the second end sealing plate to maintain the liquid level of the second slurry in the second slurry storage tank;

[0023] S3: rotating the first pressing roller and the second pressing roller to pull the paper from top to bottom, so that the first paper surface of the paper is immersed in the first dyeing slurry for dyeing, and the second paper surface of the paper is immersed in the second dyeing slurry for dyeing;

[0024] S4: The dyed paper is transported to the first drying device for drying;

[0025] S5: The dried paper is transported to the paper discharging device for delivery.

[0026] By using the paper dyeing method, the first dyeing pulp in the first pulp storage tank can dye the first paper surface of the paper, and the second dyeing pulp in the second pulp storage tank can dye the second paper surface of the paper.

[0027] Preferably, in step S2, the first slurry feeding port and the second slurry feeding port respectively add a first dye slurry to the first slurry storage tank and add a second dye slurry to the second slurry storage tank, the first dye slurry and the second dye slurry have the same color, and the depth of the first dye slurry in the first slurry storage tank is different from the depth of the second dye slurry in the second slurry storage tank.

[0028] When the colors of the first dye pulp and the second dye pulp are the same, the depth of the first dye pulp in the first pulp storage tank is different from the depth of the second dye pulp in the second pulp storage tank, and the paper is immersed in the first dye pulp and the second dye pulp for different times, so that the first paper surface and the second paper surface can achieve different color depths.

[0029] Preferably, in step S2, the first slurry feeding port and the second slurry feeding port respectively add a first dyeing slurry to the first slurry storage tank and add a second dyeing slurry to the second slurry storage tank, and the first dyeing slurry and the second dyeing slurry have different colors.

[0030] When the colors of the first dye paste and the second dye paste are different, a dyeing effect of different colors of the first paper surface and the second paper surface can be achieved.

[0031] Preferably, the edge of the paper is close to the corresponding first end sealing plate and the second end sealing plate, so as to separate the first dye paste and the second dye paste at the edge of the paper;

[0032] The first slurry feeding port is located above the first slurry storage tank, and the second slurry feeding port is located above the second slurry storage tank;

[0033] After step S5, the edge of the paper is cut off.

[0034] The edges of the paper are positioned close to the first and second end seals, reducing the distance between the edges and the first and second end seals. This minimizes paper feed and minimizes the separation of the first and second slurries, preventing them from flowing through the gap between the paper edges and the first and second end seals, potentially affecting the color of the other side. The first slurry inlet is located above the first slurry reservoir, and the second slurry inlet is located above the second slurry reservoir. This allows the first and second slurries to flow to the left and right sides, allowing them to mix in the gap between the edges of the paper. Even if the first and second slurries mix in the gap between the edges, they remain on the sides, avoiding flow toward the center, thereby affecting the color of the central area. Furthermore, after dyeing, the edges of the paper are trimmed. This allows the desired different color effects on the first and second sides of the paper to be achieved, even if the first and second slurries mix and dye the edges.

[0035] Preferably, the first dye pulp and the second dye pulp overflowing from the upper side of the first end sealing plate and the upper side of the second end sealing plate are collected, and the collected first dye pulp and the second dye pulp are adjusted to other colors before being used for dyeing.

[0036] The first and second dyeing slurries of different colors must be continuously added and overflowed during the dyeing process to maintain the dyeing effect of the first and second paper surfaces, and the amount used is large. Therefore, the first and second dyeing slurries are collected after overflowing, and then can be adjusted to other required colors and then used to dye other color papers, thereby realizing the reuse of dyeing slurries and reducing material waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0038] Figure 1 Schematic diagram of the structure of the paper dyeing production system of the present invention;

[0039] Figure 2 It is a structural schematic diagram of the dyeing device of the present invention;

[0040] Figure 3 It is a schematic structural diagram of the dyeing device, pre-drying device and first drying device of the present invention.

[0041] In the accompanying drawings: 1-paper feeding device, 2-dyeing device, 21-first dyeing frame, 22-first pressing roller, 221-first pulp storage tank, 23-second pressing roller, 231-second pulp storage tank, 241-first end sealing plate, 242-second end sealing plate, 25-first material receiving trough, 26-first pulp feeding pipe, 261-first pulp feeding port, 27-second pulp feeding pipe, 271-second pulp feeding port, 28-first movable frame, 281-opening and closing drive unit, 3-first drying device, 32-first drying cylinder, 33-first dryer net, 4-surface treatment device, 5-second drying device, 6-paper discharging device, 7-pre-drying device, 71-pre-drying chamber, 8-paper.

[0042] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] It should be noted that if the embodiments of the present invention involve directional indications, such as up, down, left, right, front, and back, the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0045] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0046] like Figures 1 to 3 As shown, a paper dyeing production system includes a paper feeding device 1, a dyeing and drying component, a surface treatment drying component and a paper discharging device 6.

[0047] The paper feed device 1 is used to continuously forwardly convey paper 8. The paper feed device 1 can adopt an existing paper feed device 1, and the paper 8 to be dyed is placed in a roll in the paper feed device 1. The paper 8 is pulled out from the paper roll and can be continuously forwarded for production.

[0048] The dyeing and drying assembly is arranged at the front side of the paper feeding device 1, and the dyeing and drying assembly includes a dyeing device 2 and a first drying device 3. The first drying device 3 is arranged at the front side of the dyeing device 2. The dyeing device 2 includes a first dyeing rack 21. Figure 2, a first pressing roller 22 and a second pressing roller 23 are provided on the first dyeing frame 21, and the axes of the first pressing roller 22 and the second pressing roller 23 extend in the left-right direction. The first pressing roller 22 and the second pressing roller 23 are arranged front to back and close to each other. The first pressing roller 22 and the second pressing roller 23 can pass through the paper 8 from top to bottom and press the paper 8. A first pulp storage tank 221 is formed between the upper side of the first pressing roller 22 and the first paper surface of the paper 8, and a second pulp storage tank 231 is formed between the upper side of the second pressing roller 23 and the second paper surface of the paper 8. The first pulp storage tank 221 can store the first dye pulp to dye the first paper surface, and the second pulp storage tank 231 can store the second dye pulp to dye the second paper surface. The dyeing device 2 also includes two first end sealing plates 241 and two The first end sealing plate 241 is provided at the left and right ends of the first pulp storage tank 221, and the second end sealing plate 242 is provided at the left and right ends of the second pulp storage tank 231. The first end sealing plate 241 is used to block the first dyeing slurry at the left and right ends of the first pulp storage tank 221, and the second end sealing plate 242 is used to block the second dyeing slurry at the left and right ends of the second pulp storage tank 231. The dyeing device 2 also includes a first pulp feeding pipe 26 and a second pulp feeding pipe 27. The first pulp feeding pipe 26 is provided with a first pulp feeding port 261 for adding the first dyeing slurry to the first pulp storage tank 221, and the second pulp feeding pipe 27 is provided with a second pulp feeding port 271 for adding the second dyeing slurry to the second pulp storage tank 231. The first drying device 3 is used to dry the dyed paper 8. The first dyeing frame 21 is provided with two first drive motors, which can respectively drive the first pressing roller 22 and the second pressing roller 23 to rotate in opposite directions, thereby pressing the paper 8 and pulling it forward. The surface of at least one of the first pressing roller 22 and the second pressing roller 23 is provided with elastic material, which enables the first pressing roller 22 and the second pressing roller 23 to better clamp the paper 8. The first end sealing plate 241 and the second end sealing plate 242 on the same side can be set separately or integrally.

[0049] The paper discharging device 6 is provided at the front side of the dyeing and drying assembly, and is used for delivering the dyed paper 8. The paper discharging device 6 can be an existing paper discharging device 6, and the dyed paper 8 can be discharged into a paper roll or sent to other equipment for processing such as cutting.

[0050] The paper 8 to be dyed enters from the paper feeding device 1 and is conveyed forward to the dyeing and drying assembly; the dyeing device 2 includes two first pressing rollers 22 and a second pressing roller 23, and the paper 8 passes between the first pressing roller 22 and the second pressing roller 23; the upper side of the first pressing roller 22 and the first paper surface of the paper 8 form a first pulp storage tank 221, and the first pulp feeding port 261 of the first pulp feeding pipe 26 can add the first dye pulp into the first pulp storage tank 221. The two first end sealing plates 241 block the first dye pulp at the left and right ends of the first pulp storage tank 221, so that the first dye pulp can be stored to a certain depth in the first pulp storage tank 221; the upper side of the second pressing roller 23 and the second paper surface of the paper 8 form a second pulp storage tank 2 31, the second slurry feeding port 271 of the second slurry feeding pipe 27 can add the second dye slurry into the second slurry storage tank 231, and the two second end sealing plates 242 block the second dye slurry at the left and right ends of the second slurry storage tank 231, so that the second dye slurry can be stored to a certain depth in the second slurry storage tank 231, and the dyeing is more stable; during the conveying process of the paper 8, the first dye slurry and the second dye slurry can be respectively attached to the first paper surface and the second paper surface of the paper 8 for dyeing, and the relative pressure of the first pressing roller 22 and the second pressing roller 23 makes the dye slurry more flat on the paper surface; then the dyed paper 8 enters the first drying device 3 to dry the dye; finally, the paper 8 is delivered from the paper discharge device 6 to complete the dyeing.

[0051] This paper dyeing production system separates dyeing from the existing method of manufacturing colored paper 8. The paper 8 that needs to be dyed enters the dyeing device 2 for dyeing. When the color of the paper 8 needs to be switched, it is only necessary to clean the dyeing device 2 and a small number of other structures to switch. Compared with the existing papermaking equipment for cleaning, the paper dyeing production system has a short cleaning downtime, and the water consumption and wastewater treatment volume are greatly reduced, thereby achieving rapid switching to produce paper 8 of different colors, with low switching costs, which can meet the production of small batches of paper 8 of different colors; in addition, the colors of the first dye pulp and the second dye pulp can be the same or different, and the first dye pulp and the second dye pulp can be both added or one of them can be added to achieve dyeing of the paper 8 with a variety of different effects.

[0052] In some specific embodiments, the paper dyeing production system further includes a surface treatment and drying assembly, which is disposed between the dyeing and drying assembly and the paper discharge device 6. The surface treatment and drying assembly includes a surface treatment device 4 and a second drying device 5, with the second drying device 5 disposed in front of the surface treatment device 4. The surface treatment device 4 is used to apply a surface treatment agent to the surface of the dyed paper 8, and the second drying device 5 is used to dry the paper 8 after the surface treatment agent has been applied. The surface treatment agent can be an existing water repellent agent, which can increase the water repellency of the surface of the paper 8 after dyeing, or an existing surface treatment agent that can enhance the surface strength or improve the gloss of the paper 8. The surface treatment agent can be selected based on actual needs.

[0053] After dyeing, the paper 8 enters the surface treatment and drying assembly. Surface treatment device 4 applies a surface treatment agent to the surface of the dyed paper 8, which protects the dyed surface. The paper 8 then enters the second drying device 5 to dry the surface treatment agent. The structure of the second drying device 5 can be the same as that of the first drying device 3, and can adopt cylinder contact drying, non-contact pre-drying plus cylinder contact drying, or only non-contact drying.

[0054] Furthermore, the surface treatment device 4 includes a surface treatment frame, on which a third pressure roller and a fourth pressure roller parallel to each other are provided, the axes of the third pressure roller and the fourth pressure roller both extend in the left-right direction, the third pressure roller and the fourth pressure roller are arranged front to back and close to each other, the third pressure roller and the fourth pressure roller can pass through the paper 8 from top to bottom and press the paper 8, a third pulp storage tank is formed between the upper side of the third pressure roller and the first paper surface of the paper 8, and a fourth pulp storage tank is formed between the upper side of the fourth pressure roller and the second paper surface of the paper 8, the third pulp storage tank can store a surface treatment agent to apply the surface treatment agent to the first paper surface, and the fourth pulp storage tank can store a surface treatment agent to apply the surface treatment agent to the second paper surface.

[0055] The upper side of the third pressing roller and the first surface of the paper 8 form a third slurry reservoir, and the upper side of the fourth pressing roller and the second surface of the paper 8 form a fourth slurry reservoir. Surface treatment agent is added to the third and fourth slurry reservoirs. During the transportation of the paper 8, the surface treatment agent can adhere to the first and second surfaces of the paper 8, and the relative pressure of the third and fourth pressing rollers makes the surface treatment agent smoother on the paper surface. The structure and principle of the surface treatment device 4 in this embodiment are basically the same as those of the dyeing device 2. In other embodiments, the surface treatment device 4 can also apply the surface treatment agent to the surface of the paper 8 by spraying or other methods.

[0056] In some specific embodiments, the dyeing and drying components are provided in a single set; alternatively, the dyeing and drying components are provided in two or more sets, with the surface treatment drying component positioned in front of the frontmost dyeing and drying component. The two or more dyeing and drying components can dye the paper 8 multiple times, bringing the color of the paper 8 closer to the target color.

[0057] In some specific embodiments, referring to Figure 3 The first drying device 3 includes a first drying rack, on which a plurality of first drying cylinders 32 are provided. The plurality of first drying cylinders 32 are arranged in an up-and-down staggered manner from back to front. The first drying rack is further provided with a first drying net 33, which is wound around the plurality of first drying cylinders 32. The plurality of first drying cylinders 32 can pass through the plurality of first drying cylinders 32 and dry the paper 8. The first drying net 33 is used to press the paper 8 onto the first drying cylinders 32.

[0058] The dyeing and drying assembly also includes a pre-drying device 7, which is arranged between the dyeing device 2 and the first drying device 3. The pre-drying device 7 is provided with a pre-drying chamber 71, which is used for the paper 8 to pass through and be pre-dried before entering the first drying device 3.

[0059] The use of multiple first drying cylinders 32 improves drying efficiency while reducing the space occupied by the first drying device 3. The first drying cylinders 32 and first drying net 33 follow the existing structure. A heating source, such as a heating wire or steam, is provided within the first drying cylinder 32 to heat the first drying cylinder 32. The paper 8 is dried by being applied to the first drying cylinder 32. The multiple first drying cylinders 32 are arranged in a staggered pattern, reducing space occupied.

[0060] After the paper 8 is dyed, due to the relatively high humidity, if it passes directly through the first drying cylinder 32 and the first drying net 33, it is easy for the first drying net 33 to leave marks on the paper 8, resulting in an uneven surface of the paper 8. Therefore, the paper 8 first passes through the pre-drying chamber 71 of the pre-drying device 7. The pre-drying chamber 71 pre-dries the paper 8 to reduce moisture without affecting the flatness of the paper 8 surface. This ensures that no or minimal marks are left on the paper 8 when it passes through the first drying cylinder 32 and the first drying net 33.

[0061] Furthermore, the pre-drying device 7 is an electric heating wire, gas or infrared heating furnace. The electric heating wire, gas or infrared heating furnace structure heats the pre-drying chamber 71, and the paper 8 is dried after passing through the pre-drying chamber 71.

[0062] In other embodiments, the first drying device 3 includes a drying chamber for passing and drying the paper after it has been impregnated with dye slurry. The first drying device 3 is an electric heating wire, gas-fired, or infrared heating furnace. The electric heating wire, gas-fired, or infrared heating furnace heats the drying chamber, allowing the paper after it has been impregnated with dye slurry to pass directly into the drying chamber for drying. This non-contact drying of the paper through the drying chamber avoids the uneven imprinting that can occur on the paper surface due to contact drying using a drying cylinder.

[0063] In some specific embodiments, the dyeing device 2 also includes two first material receiving troughs 25, which are respectively arranged on the lower side of the outer sides of the two first end sealing plates 241 and the two second end sealing plates 242. The first material receiving trough 25 is used to receive the first dyeing slurry overflowing from the upper side of the first end sealing plate 241 in the first slurry storage tank 221 and to receive the second dyeing slurry overflowing from the upper side of the second end sealing plate 242 in the second slurry storage tank 231.

[0064] The first dye slurry and the second dye slurry are continuously added to the first slurry storage tank 221 and the second slurry storage tank 231 until the liquid level of the first dye slurry reaches a height that overflows the first end sealing plate 241, and the liquid level of the second dye slurry reaches a height that overflows the second end sealing plate 242. The first dye slurry overflows from the upper side of the first end sealing plate 241 and is received by the first material receiving trough 25, and the second dye slurry overflows from the upper side of the second end sealing plate 242 and is received by the first material receiving trough 25. In this way, the liquid level of the first dye slurry in the first slurry storage tank 221 remains substantially unchanged, and the liquid level of the second dye slurry in the second slurry storage tank 231 remains substantially unchanged, so that the time the paper 8 is dyed and the dyeing effect remain substantially the same, thereby improving color consistency.

[0065] In some specific embodiments, the first end sealing plate 241 and the second end sealing plate 242 are both fixed relatively to the first dyeing frame 21, and the first end sealing plate 241 and the second end sealing plate 242 are arranged on the upper side between the first pressing roller 22 and the second pressing roller 23, the first pressing roller 22 is arranged on the rear side of the second pressing roller 23, the circumferential surface of the first pressing roller 22 abuts against the rear side of the first end sealing plate 241, and the shape of the rear side surface of the first end sealing plate 241 is matched with the shape of the first pressing roller 22, the circumferential surface of the second pressing roller 23 abuts against the front side of the second end sealing plate 242, and the shape of the rear side surface of the second end sealing plate 242 is matched with the shape of the second pressing roller 23.

[0066] In some specific embodiments, the dyeing device 2 further includes a dye slurry reservoir for storing dye slurries. When the first dye slurry and the second dye slurry are of the same color, the first slurry feeding pipe 26 and the second slurry feeding pipe 27 can be connected to the same dye slurry reservoir. The first slurry feeding pipe 26 and the second slurry feeding pipe 27 are both provided with a slurry feeding on-off valve, which can control whether the first slurry feeding pipe 26 and the second slurry feeding pipe 27 feed slurry.

[0067] In some specific embodiments, a first movable frame 28 is rotatably connected to the first dyeing frame 21, the second pressure roller 23 is provided on the first dyeing frame 21, and the first pressure roller 22 is provided on the first movable frame 28. An opening and closing drive unit 281 is connected between the first dyeing frame 21 and the first movable frame 28. The opening and closing drive unit 281 can drive the first movable frame 28 to rotate so that the first pressure roller 22 and the second pressure roller 23 are relatively close to or relatively far away from each other. The first dyeing frame 21 and the first movable frame 28 are both provided with a first drive motor, and the two first drive motors are transmission-connected to the first pressure roller 22 and the second pressure roller 23 in a one-to-one correspondence.

[0068] Before production begins, the first and second press rollers 22 and 23 are separated. After the paper 8 is placed between the first and second press rollers 22 and 23, the opening and closing drive unit 281 drives the first movable frame 28 to rotate, bringing the first and second press rollers 22 and 23 closer together to clamp the paper 8 and form the first pulp reservoir 221, facilitating the feeding of the paper 8. The opening and closing drive unit 281 can be a rubber pneumatic tire, an air cylinder, or a hydraulic cylinder.

[0069] In some specific embodiments, the first slurry feeding port 261 faces the first slurry storage tank 221 or the side wall of the first press roller 22 close to the first slurry storage tank 221, and the second slurry feeding port 271 faces the second slurry storage tank 231 or the side wall of the second press roller 23 close to the first slurry storage tank 221. When the first slurry feeding port 261 faces the first press roller 22 and the second slurry feeding port 271 faces the second press roller 23, the first dyeing slurry first falls on the first press roller 22 and then flows into the first slurry storage tank 221, and the second dyeing slurry first falls on the second press roller 23 and then flows into the second slurry storage tank 231, so that the liquid levels in the first slurry storage tank 221 and the second slurry storage tank 231 are more stable, and the dyeing is more uniform.

[0070] In another aspect of the present invention, a paper dyeing method using the above-mentioned paper dyeing production system is provided, the paper dyeing method comprising the following steps:

[0071] S1: Place the paper roll to be dyed onto the paper feeding device 1, draw the paper 8 through between the first pressing roller 22 and the second pressing roller 23, and press the paper 8 with the first pressing roller 22 and the second pressing roller 23, so that a first pulp reservoir 221 is formed between the first paper surface of the paper 8 and the upper side of the first pressing roller 22, and a second pulp reservoir 231 is formed between the second paper surface of the paper 8 and the upper side of the second pressing roller 23;

[0072] S2: The first slurry feeding port 261 continuously adds the first dye slurry to the first slurry storage tank 221, so that the first dye slurry is stored in the first slurry storage tank 221, and the first dye slurry exceeding the height of the first end sealing plate 241 overflows from the upper side of the first end sealing plate 241 to maintain the liquid level of the first dye slurry in the first slurry storage tank 221;

[0073] and / or, the second slurry feeding port 271 continuously adds the second slurry to the second slurry storage tank 231, so that the second slurry is stored in the first slurry storage tank 221, and the second slurry exceeds the height of the second end sealing plate 242 and overflows from the upper side of the second end sealing plate 242 to maintain the liquid level of the second slurry in the second slurry storage tank 231;

[0074] S3: The first pressing roller 22 and the second pressing roller 23 are rotated to pull the paper 8 from top to bottom, and the first paper surface of the paper 8 is immersed in the first dyeing slurry for dyeing, and the second paper surface of the paper 8 is immersed in the second dyeing slurry for dyeing;

[0075] S4: The dyed paper 8 is transported to the first drying device 3 for drying;

[0076] S5: The dried paper 8 is transported to the paper discharging device 6 for delivery.

[0077] By using the paper dyeing method, the first dye pulp in the first pulp storage tank 221 can dye the first paper surface of the paper 8 , and the second dye pulp in the second pulp storage tank 231 can dye the second paper surface of the paper 8 .

[0078] The present invention can achieve different dyeing effects:

[0079] Example 1:

[0080] In step S2 , the first slurry feeding port 261 adds the first dyeing slurry to the first slurry storage tank 221 , or the second slurry feeding port 271 adds the second dyeing slurry to the second slurry storage tank 231 , so as to achieve a single-side dyeing effect on the paper 8 .

[0081] Example 2:

[0082] In step S2, the first slurry feeding port 261 and the second slurry feeding port 271 respectively add the first dye slurry to the first slurry storage tank 221 and the second dye slurry to the second slurry storage tank 231. The first dye slurry and the second dye slurry have the same color, and the depth of the first dye slurry in the first slurry storage tank 221 is different from the depth of the second dye slurry in the second slurry storage tank 231. The difference in depth can be adjusted by the height of the upper side of the first end sealing plate 241 and the second end sealing plate 242.

[0083] When the colors of the first dye paste and the second dye paste are the same, and the depth of the first dye paste in the first slurry storage tank 221 is different from the depth of the second dye paste in the second slurry storage tank 231, the paper 8 is immersed in the first dye paste and the second dye paste for different times, so that the first paper surface and the second paper surface can achieve a dyeing effect with different shades of color.

[0084] Example 3:

[0085] In step S2, the first slurry feeding port 261 and the second slurry feeding port 271 respectively add the first dyeing slurry to the first slurry storage tank 221 and add the second dyeing slurry to the second slurry storage tank 231. The first dyeing slurry and the second dyeing slurry have the same color. The depth of the first dyeing slurry in the first slurry storage tank 221 is the same as the depth of the second dyeing slurry in the second slurry storage tank 231. The double-sided dyeing effect of the paper 8 can be achieved, and the colors on both sides are the same.

[0086] Example 4:

[0087] In step S2 , the first slurry feeding port 261 and the second slurry feeding port 271 respectively add a first dye paste to the first slurry storage tank 221 and add a second dye paste to the second slurry storage tank 231 . The first dye paste and the second dye paste have different colors.

[0088] When the colors of the first dye paste and the second dye paste are different, a dyeing effect of different colors of the first paper surface and the second paper surface can be achieved.

[0089] Furthermore, the edge of the paper 8 is close to the corresponding first end sealing plate 241 and the second end sealing plate 242, so as to separate the first dye paste and the second dye paste at the edge of the paper 8;

[0090] The first slurry delivery port 261 is located above the first slurry storage tank 221, and the second slurry delivery port 271 is located above the second slurry storage tank 231;

[0091] After step S5 , the edge portion of the paper 8 is cut off.

[0092] The edge of the paper 8 is positioned near the first and second end seals 241, 242, thereby reducing the distance between the edge of the paper 8 and the first and second end seals 241, 242. Preferably, the distance between the edge of the paper 8 and the first and second end seals 241, 242 is 3-10 mm. This does not affect the transport of the paper 8, but also minimizes the separation of the first and second slurries, thereby reducing the first and second slurries from flowing through the gap between the edge of the paper 8 and the first and second end seals 241, 242 and affecting the color of the other paper surface. The first slurry feed port 261 is located above the first slurry storage tank 221, and the second slurry feed port 271 is located above the second slurry storage tank 231. In conjunction with the overflow of the first and second slurries from the left and right sides, newly added first and second slurries flow to the left and right sides. Even if the first and second slurries mix in the gap at the edge of the paper 8, they remain on the sides and do not flow toward the center, thereby avoiding affecting the color of the central area of ​​the paper 8. In addition, after dyeing is completed, the edge portion of the paper 8 will be cut off. In this way, even if the first dye paste and the second dye paste are mixed at the edge of the paper 8 and dye the edge portion of the paper 8 with other colors, after the edge portion of the paper 8 is cut off, the remaining paper 8 can achieve the desired different color effects on the first paper surface and the second paper surface.

[0093] Furthermore, the first dye paste and the second dye paste overflowing from the upper side of the first end sealing plate 241 and the upper side of the second end sealing plate 242 are collected, and the collected first dye paste and the second dye paste are adjusted to other colors before being used for dyeing.

[0094] The first and second dyeing slurries of different colors must be continuously added and overflowed during the dyeing process to maintain the dyeing effect of the first and second paper surfaces, and the amount used is large. Therefore, the first and second dyeing slurries are collected after overflowing, and then can be adjusted to other required colors and then used to dye other color papers, thereby realizing the reuse of dyeing slurries and reducing material waste.

[0095] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present description and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A paper dyeing production system, characterized in that: include: A paper feeding device (1) for continuously feeding paper (8) forward; A dyeing and drying assembly is provided on the front side of the paper feeding device (1), the dyeing and drying assembly comprises a dyeing device (2) and a first drying device (3), the first drying device (3) is provided on the front side of the dyeing device (2), the dyeing device (2) comprises a first dyeing frame (21), the first dyeing frame (21) is provided with a first pressing roller (22) and a second pressing roller (23) which are parallel to each other, the axes of the first pressing roller (22) and the second pressing roller (23) both extend in the left-right direction, the first pressing roller (22) and the second pressing roller (23) are parallel to each other, and the first pressing roller (22) and the second pressing roller (23) are parallel to each other. The second pressing rollers (23) are arranged front to back and close to each other. The first pressing roller (22) and the second pressing roller (23) can pass through the paper (8) from top to bottom and press the paper (8). A first pulp storage tank (221) is formed between the upper side of the first pressing roller (22) and the first paper surface of the paper (8). A second pulp storage tank (231) is formed between the upper side of the second pressing roller (23) and the second paper surface of the paper (8). The first pulp storage tank (221) can store a first dyeing pulp to dye the first paper surface. The second pulp storage tank (231) can store the second dyeing slurry to dye the second paper surface, and the dyeing device (2) further includes two first end sealing plates (241) and two second end sealing plates (242), the two first end sealing plates (241) are respectively arranged at the left and right ends of the first pulp storage tank (221), and the two second end sealing plates (242) are respectively arranged at the left and right ends of the second pulp storage tank (231), the first end sealing plates (241) are used to block the first dyeing slurry at the left and right ends of the first pulp storage tank (221), and the second end sealing plates (242) are used to block the first dyeing slurry at the left and right ends of the first pulp storage tank (221). 42) is used to block the second dyeing slurry at the left and right ends of the second pulp storage tank (231), the dyeing device (2) also includes a first pulp feeding pipe (26) and a second pulp feeding pipe (27), the first pulp feeding pipe (26) is provided with a first pulp feeding port (261) for adding the first dyeing slurry to the first pulp storage tank (221), the second pulp feeding pipe (27) is provided with a second pulp feeding port (271) for adding the second dyeing slurry to the second pulp storage tank (231), and the first drying device (3) is used to dry the dyed paper (8); A paper discharging device (6) is provided on the front side of the dyeing and drying component, and the paper discharging device (6) is used to deliver the dyed paper (8); The edge of the paper (8) is close to the corresponding first end sealing plate (241) and the second end sealing plate (242), so as to separate the first dye paste and the second dye paste at the edge of the paper (8).

2. The paper dyeing production system according to claim 1, characterized in that: The paper dyeing production system further comprises a surface treatment drying component, wherein the surface treatment drying component is arranged between the dyeing drying component and the paper discharging device (6), and the surface treatment drying component comprises a surface treatment device (4) and a second drying device (5), wherein the second drying device (5) is arranged on the front side of the surface treatment device (4), the surface treatment device (4) is used to apply a surface treatment agent to the surface of the dyed paper (8), and the second drying device (5) is used to dry the paper (8) after the surface treatment agent is applied.

3. The paper dyeing production system according to claim 2, characterized in that: The surface treatment device (4) includes a surface treatment frame, on which a third pressing roller and a fourth pressing roller are provided which are parallel to each other, the axes of the third pressing roller and the fourth pressing roller both extending in the left-right direction, the third pressing roller and the fourth pressing roller being arranged front to back and close to each other, the third pressing roller and the fourth pressing roller being able to pass through the paper (8) from top to bottom and press the paper (8), a third pulp storage tank is formed between the upper side of the third pressing roller and the first paper surface of the paper (8), a fourth pulp storage tank is formed between the upper side of the fourth pressing roller and the second paper surface of the paper (8), the third pulp storage tank is able to store a surface treatment agent to apply the surface treatment agent to the first paper surface, and the fourth pulp storage tank is able to store a surface treatment agent to apply the surface treatment agent to the second paper surface.

4. The paper dyeing production system according to claim 1, characterized in that: The first drying device (3) includes a first drying frame, a plurality of first drying cylinders (32) are provided on the first drying frame, the plurality of first drying cylinders (32) are arranged in an up-and-down staggered manner from back to front, a first drying net (33) is further provided on the first drying frame, the first drying net (33) is wound around the plurality of first drying cylinders (32), the plurality of first drying cylinders (32) can pass through the plurality of first drying cylinders (32) and dry the paper (8), and the first drying net (33) is used to press the paper (8) onto the first drying cylinders (32); The dyeing and drying assembly further comprises a pre-drying device (7), the pre-drying device (7) being arranged between the dyeing device (2) and the first drying device (3), the pre-drying device (7) being provided with a pre-drying chamber (71), the pre-drying chamber (71) being used for allowing the paper (8) to pass through and be pre-dried before entering the first drying device (3).

5. The paper dyeing production system according to claim 1, characterized in that: The dyeing device (2) further comprises two first material receiving troughs (25), the two first material receiving troughs (25) being respectively arranged on the lower sides of the outer sides of the two first end sealing plates (241) and the two second end sealing plates (242), the first material receiving troughs (25) being used to receive the first dyeing slurry overflowing from the upper side of the first end sealing plate (241) in the first slurry storage trough (221) and to receive the second dyeing slurry overflowing from the upper side of the second end sealing plate (242) in the second slurry storage trough (231).

6. A paper dyeing method, characterized in that: Using the paper dyeing production system according to any one of claims 1 to 5, the paper dyeing method comprises the following steps: S1: placing the paper roll to be dyed onto the paper feeding device (1), leading the paper (8) through between the first pressing roller (22) and the second pressing roller (23), the first pressing roller (22) and the second pressing roller (23) pressing the paper (8), so that the first pulp storage tank (221) is formed between the first paper surface of the paper (8) and the upper side of the first pressing roller (22), and the second pulp storage tank (231) is formed between the second paper surface of the paper (8) and the upper side of the second pressing roller (23); S2: the first slurry feeding port (261) continuously adds the first dye slurry to the first slurry storage tank (221), so that the first dye slurry is stored in the first slurry storage tank (221), and the first dye slurry exceeding the height of the first end sealing plate (241) overflows from the upper side of the first end sealing plate (241) to maintain the liquid level of the first dye slurry in the first slurry storage tank (221); and / or, the second slurry feeding port (271) continuously adds the second slurry to the second slurry storage tank (231), so that the second slurry is stored in the first slurry storage tank (221), and the second slurry exceeding the height of the second end sealing plate (242) overflows from the upper side of the second end sealing plate (242) to maintain the liquid level of the second slurry in the second slurry storage tank (231); S3: rotating the first pressing roller (22) and the second pressing roller (23) to pull the paper (8) from top to bottom, the first paper surface of the paper (8) is immersed in the first dyeing slurry for dyeing, and the second paper surface of the paper (8) is immersed in the second dyeing slurry for dyeing; S4: the dyed paper (8) is transported to the first drying device (3) for drying; S5: The dried paper (8) is transported to the paper discharging device (6) for delivery.

7. The paper dyeing method according to claim 6, wherein In step S2, the first slurry feeding port (261) and the second slurry feeding port (271) respectively add a first dyeing slurry to the first slurry storage tank (221) and add a second dyeing slurry to the second slurry storage tank (231), the first dyeing slurry and the second dyeing slurry have the same color, and the depth of the first dyeing slurry in the first slurry storage tank (221) is different from the depth of the second dyeing slurry in the second slurry storage tank (231).

8. The paper dyeing method according to claim 6, wherein In step S2, the first slurry feeding port (261) and the second slurry feeding port (271) respectively add a first dyeing slurry to the first slurry storage tank (221) and add a second dyeing slurry to the second slurry storage tank (231), and the first dyeing slurry and the second dyeing slurry have different colors.

9. The paper dyeing method according to claim 8, wherein The edge of the paper (8) is close to the corresponding first end sealing plate (241) and the second end sealing plate (242), so as to separate the first dye paste and the second dye paste at the edge of the paper (8); The first slurry delivery port (261) is located above the first slurry storage tank (221), and the second slurry delivery port (271) is located above the second slurry storage tank (231); After step S5, the edge portion of the paper (8) is cut off.

10. The paper dyeing method according to claim 9, wherein The first dye pulp and the second dye pulp overflowing from the upper side of the first end sealing plate (241) and the upper side of the second end sealing plate (242) are collected, and the collected first dye pulp and the second dye pulp are adjusted to other colors before being used for dyeing.

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