Absorbent paper production device

Abstract

The utility model relates to the field of absorbent paper, and provides an absorbent paper production device which comprises a machine frame, a first single-layer body paper production line, a composite device, a rotary drying wheel, a winding device and a second single-layer body paper production line or an unwinding roller are arranged on the machine frame, and a macromolecule discharging device is arranged on the first single-layer body paper production line. The macromolecule discharging device discharges macromolecule water absorption materials to single-layer base paper of the first single-layer base paper production line, the two layers of single-layer base paper are compounded through the compounding device to form water absorption paper, the water absorption paper is rotationally dried through the rotary drying wheel, and the suspended hot air bed is arranged between the rotary drying wheel and the winding device. And the absorbent paper is subjected to suspension type drying through the suspension hot air bed. According to the production device, drying is conducted through the rotary drying wheel and the suspension hot air bed, the drying efficiency is greatly improved, the speed of absorbent paper can be increased, then the production efficiency is improved, and the technical problems that the production speed is affected by the drying efficiency of the absorbent paper, and the drying and production efficiency is low are solved.

Description

Technical Field

[0001] The utility model relates to the field of absorbent paper, in particular to a device for producing absorbent paper. Background Art

[0002] In traditional wet papermaking production equipment, the moisture content of absorbent paper must be lower than 10%, which is stipulated by national standards. As the square grammage of paper increases, how to maintain the speed of the production line and ensure that the moisture content of the finished paper meets the standard is a technical problem that the industry has been seeking to break through. The lower the moisture content of the finished paper, the more difficult it is to dry. For example, to produce absorbent paper with a square grammage of less than 40 grams, when a 3.6m diameter drying cylinder is used, the usual line speed can only be controlled at 20m / min-40m / min. The drying cylinder is steam-heated. When the steam pressure is 0.3Mpa, the drying cylinder temperature is about 130 degrees. If you want to produce absorbent paper with a higher grammage, you need to increase the number of drying cylinders. Some high-grammage paper production lines have more than ten drying cylinders. Due to the large diameter of the drying cylinder, it occupies a large production space, consumes high energy, and is a high-pressure container, so the requirements for steam sealing and insulation are also high. In particular, high-weight paper production lines are not easy to be compatible with low-weight production lines. This is reflected in the fact that when a high-weight paper production line is used to produce a low-weight paper production line, its production process and energy consumption do not decrease in the same proportion. However, when a wet paper production line is used to produce composite absorbent paper, because the square gram weight of composite absorbent paper is generally 60g-200g, the contradiction between its production efficiency and the moisture content of absorbent paper is more prominent. When the upper layer of dry absorbent paper, polymer, and lower layer of wet absorbent paper are composited and dried, the upper layer of dry absorbent paper contacts the surface of the drying cylinder, while the lower layer of wet absorbent paper is located radially outside the drying cylinder. In this way, the drying cylinder is double-heat-blocked by the upper layer of dry absorbent paper and the middle polymer to the lower layer of wet absorbent paper. Compared with the situation where the integral paper web has moisture for heat transfer, the drying effect of the composite absorbent paper is further reduced.

[0003] Chinese patent application number: CN201921152260.5, provides a production line for composite processing of absorbent paper, including a frame, a single-layer base paper unwinding machine, a polymer absorbent resin feeder, a pressure roller and a pressing roller, an upper felt carrying a single-layer semi-formed base paper is pressed in the pressing roller, the polymer absorbent resin feeder is filled with polymer absorbent resin particles, the single-layer base paper unwinding machine is rolled with a single-layer base paper, the upper felt and the single-layer semi-formed base paper are wound around the bottom of the polymer absorbent resin feeder, the polymer absorbent resin particles are laid on the single-layer semi-formed base paper, the single-layer base paper is covered on the single-layer semi-formed base paper carrying the polymer absorbent resin particles, the single-layer base paper, the polymer absorbent resin particles, the single-layer semi-formed base paper and the upper felt extend into the pressure roller, so that the single-layer base paper and the single-layer semi-formed base paper carrying the polymer absorbent resin particles form an integrated multi-layer finished absorbent paper. The production speed of the production line is affected by the drying efficiency. If the production efficiency is accelerated, the moisture content of the product will increase, making it difficult to increase the production speed of absorbent paper, and the drying and production efficiency will be low. Utility Model Content

[0004] Therefore, in view of the above problems, the utility model proposes a water-absorbing paper production device, which solves the technical problem that the drying efficiency of water-absorbing paper affects the production speed and the drying and production efficiency are low.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A water-absorbing paper production device, characterized in that it comprises a frame, on which a first single-layer base paper production line, a compounding device, a rotary drying wheel, and a winding device are arranged, and a second single-layer base paper production line or a unwinding roller is also arranged on the frame, and a polymer unloading device is arranged on the first single-layer base paper production line, and the polymer unloading device unloads the polymer water-absorbing material onto the single-layer base paper of the first single-layer base paper production line, and the two layers of single-layer base paper are compounded by the compounding device to form water-absorbing paper, and the water-absorbing paper is rotary dried by the rotary drying wheel, and a suspended hot air bed is arranged between the rotary drying wheel and the winding device, and the water-absorbing paper is suspended dried by the suspended hot air bed.

[0007] Further:

[0008] The suspended hot air bed comprises a box body arranged on a frame, at least one burner arranged in the box body, and at least one fan connected to the burner.

[0009] A suspension channel is provided in the middle of the box body, and symmetrically arranged combustion channels are provided at the top and bottom of the box body. At least one burner and a fan are provided in each of the combustion channels, and each of the combustion channels is connected to a plurality of air nozzles.

[0010] The air nozzles of the two combustion channels are alternately arranged at projection intervals on the horizontal plane.

[0011] The combustion channel comprises a first channel and a second channel which are sequentially arranged along the conveying direction. The cross-sectional areas of the first channel at each position are equal, and the cross-sectional area of ​​the second channel decreases along the conveying direction.

[0012] The cross section of the first channel is a rectangular structure, and the cross section of the second channel is a right-angled trapezoidal structure.

[0013] The box body is provided with an upper bed body and a lower bed body, at least one adjusting cylinder is provided between the upper bed body and the lower bed body, the adjusting cylinder can adjust the distance between the upper bed body and the lower bed body, the suspension channel is formed between the upper bed body and the lower bed body, and the two combustion channels are respectively provided in the upper bed body and the lower bed body.

[0014] The first single-layer base paper production line includes a first mesh cylinder, a plurality of first guide rollers, a first upper felt, a first lower felt, and a pressing roller.

[0015] The second single-layer base paper production line includes a second mesh cylinder, a plurality of second guide rollers, a second drying cylinder, and a second felt.

[0016] The second single-layer base paper production line further comprises a cooling roller.

[0017] By adopting the above technical solution, the beneficial effects of the utility model are:

[0018] The utility model adopts rotary drying and suspension drying. The rotary drying can dry absorbent paper in an arc state, and the suspension drying can dry absorbent paper in a nearly horizontal state. The temperature of the hot air after secondary combustion can reach 200 degrees. By blowing hot air strongly on the surface of the lower single-layer base paper in the composite absorbent paper, the wood pulp fibers in the paper web can be curled and deformed. Because the arrangement of the fibers is disordered, the curling of fibers with different orientations makes the entire paper web more fluffy, and the fluffy paper web is more conducive to further drying of the moisture therein. More importantly, in the process of being applied to products in the later stage, the liquid absorption speed of the product can be more than 30% faster, and the product has better air permeability. A further improvement is to perform a second hot air blow on the upper and lower surfaces of the composite absorbent paper. The bulkiness, liquid absorption speed, and air permeability of the composite absorbent paper after the second heat treatment are significantly improved, greatly improving the quality of the product. On this basis, the aforementioned contradiction between the production efficiency and the moisture content of the finished product is resolved. Therefore, when the composite absorbent paper is produced by this method, the production speed can reach 60-100m / min for the same absorbent paper with a square weight of 60-200g, and the moisture content of the finished paper can be controlled below 5%, which is far lower than the industry standard. That is, the production device can increase the production efficiency by 2.5 to 3 times without significantly increasing the length of the production line or the number of drying cylinders. Furthermore, two single-layer base paper production lines produce two single-layer base papers at the same time, and the two single-layer base papers are compounded with polymer absorbent materials to form absorbent paper, realizing fully automated production. The two single-layer base papers are produced at the same time, eliminating the step of staff putting the first produced single-layer base paper on the unwinding device, saving labor costs and improving production efficiency; further, the air nozzles are alternately arranged up and down to form a maze-like suspended channel, and the front and back sides of the fibers are continuously curled and deformed under alternating heating, making the composite material looser and more breathable, which not only improves the quality of the product, but also improves the drying efficiency and saves energy. Furthermore, the cross-section of the first channel is equal, and the absorbent paper is preheated. The cross-section area of ​​the second channel decreases along the conveying direction. The smaller the area, the greater the wind speed. The absorbent paper is dried step by step, and the absorbent paper will not be exposed to high temperature instantly, which prevents the absorbent paper from expanding instantly due to the large temperature difference between the absorbent paper and the ambient temperature, and prevents the internal structure of the absorbent paper from being pulled and damaged, while also improving the drying efficiency. Furthermore, the upper bed and the lower bed can adjust their positions, thereby adjusting the width of the suspension channel, and adjusting according to the production of absorbent papers of different gram weights, thereby improving the drying effect and production speed, and improving the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a fully automatic absorbent paper production device;

[0020] Figure 2 It is a schematic diagram of the structure of the first single-layer base paper production line;

[0021] Figure 3 yes Figure 2 A simplified structural diagram;

[0022] Figure 4 It is a structural schematic diagram of the second single-layer base paper production line;

[0023] Figure 5 yes Figure 4 A simplified structural diagram;

[0024] Figure 6 It is a structural schematic diagram of a suspended hot air bed. DETAILED DESCRIPTION

[0025] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0026] refer to Figures 1 to 6The present embodiment provides a water-absorbing paper production device, including a frame 1, on which a first single-layer base paper production line 2, a second single-layer base paper production line 3, a compounding device 4, a rotary drying wheel 5, and a winding device 6 are arranged. Semi-dry base paper 71 is formed on the first single-layer base paper production line 2, and fully dry base paper 72 is formed on the second single-layer base paper production line 3. A polymer unloading device 21 is arranged on the first single-layer base paper production line 2. The polymer unloading device 21 unloads the polymer water-absorbing material onto the first single-layer base paper production line 2. The semi-dry base paper 71 and the fully dry base paper 72 are compounded by the compounding device 4 to form water-absorbing paper 7. The water-absorbing paper 7 is subjected to rotary drying by the rotary drying wheel 5, and finally is wound by the winding device 6. A suspended hot air bed 8 is arranged between the rotary drying wheel 5 and the winding device 6, and the water-absorbing paper 7 is subjected to suspended drying by the suspended hot air bed 8. The suspended hot air bed 8 includes a box body 81 arranged on the frame 1. The box body 81 is provided with an upper bed body 811 and a lower bed body 812, and at least one adjusting cylinder 813 is provided between the upper bed body 811 and the lower bed body 812, and the adjusting cylinder 813 can adjust the distance between the upper bed body 811 and the lower bed body 812, and a suspension channel 82 is formed between the upper bed body 811 and the lower bed body 812. Two combustion channels 83 are respectively provided in the upper bed body 811 and the lower bed body 812, and the two combustion channels 83 are symmetrically arranged. A burner and a fan 84 are provided in each combustion channel 83, and each combustion channel 83 is connected to a plurality of air nozzles 85, and the air nozzles 85 of the two combustion channels 83 are alternately arranged up and down. The combustion channel 83 includes a first channel 831 and a second channel 832 arranged in sequence along the conveying direction, and the cross section of the first channel 831 is a rectangular structure, and the cross-sectional area of ​​each position of the first channel 831 is equal, and the cross section of the second channel 832 is a right-angled trapezoidal structure, and the cross-sectional area of ​​the second channel 832 decreases along the conveying direction. The first single-layer base paper production line 2 includes a first mesh cylinder 21, a plurality of first guide rollers 22, a first upper felt 23, a first lower felt 24, and a press roller 25. The second single-layer base paper production line 3 includes a second mesh cylinder 31, a plurality of second guide rollers 32, a second drying cylinder 33, a second felt 34, and a cooling roller 35.

[0027] The above-mentioned first single-layer base paper production line 2 and second single-layer base paper production line 3 can adopt the structure of other single-layer base paper production lines. Please refer to Chinese patent application number: CN201921152260.5, which provides a production line for composite processing of absorbent paper, which is set according to specific circumstances.

[0028] The above-mentioned second single-layer base paper production line 3 can also be replaced by a unwinding roller. After producing the fully dry base paper 72 on the first single-layer base paper production line 2 or other devices, the fully dry base paper 72 is placed on the unwinding roller for unwinding and then compounded with the semi-dry base paper 71. The specific setting depends on the situation.

[0029] The composite device 4 can be a composite roller or other composite devices, which are well-known devices and will not be described in detail here.

[0030] The winding device 6 may be a winding roller or other winding devices, which are well-known devices and will not be described in detail here.

[0031] The suspended hot air bed 8 can be an air flotation oven or other drying devices, which are well-known devices and will not be described in detail here.

[0032] Thermal insulation rock wool may be arranged in the box body 81, depending on the specific situation.

[0033] The above-mentioned air nozzle 85 can be made of aluminum alloy, and the effective width of the air nozzle 85 is 2550mm. A perforated plate is installed between the air nozzles 85 to prevent paper pieces from being sucked into the air duct. Air nozzles 85 with other structures can also be used, and the specific settings are based on the situation.

[0034] The burner, fan 84 and polymer feeding device 21 are well-known devices and will not be described in detail here.

[0035] The above-mentioned air nozzles 85 may not be arranged to be arranged alternately up and down, and may be arranged according to specific circumstances.

[0036] The box body 81 may not be configured as an adjustable upper bed body 811 and a lower bed body 812, and may be configured according to specific circumstances.

[0037] The first mesh cylinder 21, the first guide roller 22, the first upper felt 23, the first lower felt 24, and the pressing roller 25 are well-known structures and will not be described in detail herein.

[0038] The second mesh cylinder 31, the plurality of second guide rollers 32, the rotary drying wheel 5, the second drying cylinder 33, and the second felt 34 are well-known structures and will not be described in detail herein.

[0039] The working mode of the utility model is:

[0040] Semi-dry base paper 71 is formed on the first single-layer base paper production line 2, and the polymer unloading device 21 unloads the polymer water-absorbing material onto the semi-dry base paper 71 of the first single-layer base paper production line 2; at the same time, fully dry base paper 72 is formed on the second single-layer base paper production line 3, and the fully dry base paper 72 passes over the polymer unloading device 21. The semi-dry base paper 71 and the fully dry base paper 72 are compounded in the compounding device 4 to form absorbent paper 7, and the absorbent paper 7 is rotary dried by the rotary drying wheel 5, and then suspended dried by the suspended hot air bed 8, and finally enters the winding device 6 for winding. This structure realizes fully automated production, eliminates the step of the staff putting the fully dry base paper 72 produced first on the unwinding device, saves labor costs, and improves production efficiency.

[0041] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A device for producing absorbent paper, characterized in that: The invention comprises a frame, on which a first single-layer base paper production line, a compounding device, a rotary drying wheel and a winding device are arranged, and a second single-layer base paper production line or a unwinding roller is also arranged on the frame, and a polymer unloading device is arranged on the first single-layer base paper production line, and the polymer unloading device unloads the polymer water-absorbing material onto the single-layer base paper of the first single-layer base paper production line, and two layers of single-layer base paper are compounded by the compounding device to form absorbent paper, and the absorbent paper is rotary dried by the rotary drying wheel, and a suspended hot air bed is arranged between the rotary drying wheel and the winding device, and the absorbent paper is suspended dried by the suspended hot air bed.

2. The absorbent paper production device according to claim 1, characterized in that: The suspended hot air bed comprises a box body arranged on a frame, at least one burner arranged in the box body, and at least one fan connected to the burner.

3. The absorbent paper production device according to claim 2, characterized in that: A suspension channel is provided in the middle of the box body, and symmetrically arranged combustion channels are provided at the top and bottom of the box body. At least one burner and a fan are provided in each of the combustion channels, and each of the combustion channels is connected to a plurality of air nozzles.

4. The absorbent paper production device according to claim 3, characterized in that: The air nozzles of the two combustion channels are alternately arranged at projection intervals on the horizontal plane.

5. The absorbent paper production device according to claim 3, characterized in that: The combustion channel comprises a first channel and a second channel which are sequentially arranged along the conveying direction. The cross-sectional areas of the first channel at each position are equal, and the cross-sectional area of ​​the second channel decreases along the conveying direction.

6. The absorbent paper production device according to claim 5, characterized in that: The cross section of the first channel is a rectangular structure, and the cross section of the second channel is a right-angled trapezoidal structure.

7. The absorbent paper production device according to any one of claims 3 to 6, characterized in that: The box body is provided with an upper bed body and a lower bed body, at least one adjusting cylinder is provided between the upper bed body and the lower bed body, the adjusting cylinder can adjust the distance between the upper bed body and the lower bed body, the suspension channel is formed between the upper bed body and the lower bed body, and the two combustion channels are respectively provided in the upper bed body and the lower bed body.

8. The absorbent paper production device according to claim 1, characterized in that: The first single-layer base paper production line includes a first mesh cylinder, a plurality of first guide rollers, a first upper felt, a first lower felt, and a pressing roller.

9. The absorbent paper production device according to claim 1, characterized in that: The second single-layer base paper production line includes a second mesh cylinder, a plurality of second guide rollers, a second drying cylinder, and a second felt.

10. The absorbent paper production device according to claim 9, characterized in that: The second single-layer base paper production line further comprises a cooling roller.

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