Device for forming high-bulk paper for daily use

Abstract

The utility model provides a device for forming high-bulk paper for daily use. The device comprises a humidifying unit and a forming unit, an embossing unit; a drying unit; the humidifying unit, the embossing unit and the drying unit are sequentially arranged, the humidifying unit comprises a humidifying assembly, the humidifying assembly comprises a plurality of carrier rollers, a transfer belt and a transfer roller, the carrier rollers comprise forward stretching rollers, at least one part of the transfer roller is immersed in a water tank and used for transferring water to the transfer belt, and the transfer belt comprises a humidifying section; the humidifying section abuts against a body paper web and wets body paper to form a wet paper web, the embossing unit comprises an embossing roller and a bottom roller, the drying unit comprises a drying roller, a gap is formed between the drying roller and the bottom roller, and the wet embossed paper web is attached to the bottom roller, moves through the gap and then is attached to the drying roller to be dried by the drying roller. By means of the mode, water can be distributed more evenly, so that the accuracy of the adding amount is guaranteed, the unexpected paper breaking phenomenon is not prone to occurring, the production speed is increased, and meanwhile the bulk of paper can be further increased through the mode.

Description

Technical Field

[0001] The utility model relates to a device for forming high-bulk household paper. Background Art

[0002] Cellulose fiber structures are widely used in household products such as toilet paper and napkins. Usually, paper products are cellulose fiber structures formed by laminating at least one layer of base paper face to face. To meet consumers' aesthetic needs, manufacturers use an embossing process on paper towels containing multiple layers of base paper. The embossing process not only makes the paper towels beautiful but also increases the surface area of the layer, improving bulk, water holding capacity, and softness.

[0003] To make household paper have better bulk and touch, it has been found that humidifying or wetting the paper before embossing and then embossing and drying can form household paper with better bulk and touch. Specifically, the methods shown in documents such as CN110914048A and EP173129681 are adopted. Specifically, the humidifying or wetting method is to humidify or wet the paper by spraying. However, when humidifying the paper surface in this spraying manner, due to the infiltration and diffusion process of water in the paper, it is difficult to control the addition amount, and it is easy to have over-amount in some areas or insufficient amount in some areas, resulting in paper breakage during the production process or failure to reach the set target during downstream embossing. Especially for household paper with a low basis weight, such as household paper with a basis weight of 15 g or less, due to its low basis weight and low strength, it is more easily affected by the humidification uniformity, leading to paper breakage during production or uneven areas formed during subsequent embossing-drying. Therefore, a new solution is needed to solve the above problems, especially to improve the bulk for low-basis-weight household paper. Summary of the Utility Model

[0004] For this reason, the utility model provides a device for forming high-bulk household paper to solve the above technical problems.

[0005] A device for forming high-bulk household paper, characterized by comprising:

[0006] A humidifying unit for humidifying the original paper web to form a wet paper web;

[0007] An embossing unit for embossing the wet paper web to form a wet embossed paper web;

[0008] A drying unit for drying the embossed paper web to form a dry embossed paper web;

[0009] The humidifying unit, embossing unit, and drying unit are arranged in sequence. Among them, the humidifying unit includes at least one humidifying component, and the humidifying component includes a number of carrier rollers, a transfer belt wound around the carrier rollers, and a transfer roller. The carrier rollers include a front-extending roller corresponding to the transfer roller. At least a part of the transfer roller is immersed in a water tank for transferring water to the transfer belt. The transfer belt includes a humidifying section downstream of the front-extending roller. The humidifying section contacts the base paper web and wets the base paper to form a wet paper web. The embossing unit includes an embossing roller and a bottom roller. The drying unit includes a drying roller. The drying roller is adjacent to the bottom roller and has a gap with the bottom roller. After the wet embossed paper web adheres to the bottom roller and moves through the gap, it adheres to the drying roller and is dried by the drying roller.

[0010] Among them, the humidifying component includes an upper humidifying component and a lower humidifying component, which are respectively arranged on both sides of the base paper web. The upper humidifying component includes a number of upper carrier rollers, an upper transfer belt wound around the upper carrier rollers, and an upper transfer roller. The lower humidifying component includes a number of lower carrier rollers, a lower transfer belt wound around the lower carrier rollers, and a lower transfer roller. Among them, the upper carrier rollers at least include a first upper carrier roller, a second upper carrier roller, and an upper front-extending roller. The lower carrier rollers at least include a first lower carrier roller, a second lower carrier roller, and a lower front-extending roller. The upper front-extending roller is correspondingly arranged with the upper transfer roller. The lower front-extending roller is correspondingly arranged with the lower transfer roller. The upper transfer belt includes a first humidifying section, and the first humidifying section contacts the base paper web. The lower transfer belt includes a second humidifying section, and the second humidifying section contacts the base paper web.

[0011] Among them, upstream of the first humidifying section, between the upper front-extending roller and the first upper carrier roller, there is also a first transfer section. The first transfer section is linear and the first transfer section is inclined to the first humidifying section. There is an included angle of 120° - 155° between the first transfer section and the first humidifying section.

[0012] Among them, the drying roller is in a cylindrical shape, including a side wall and a cavity part formed by the side wall. An air suction box is arranged in the cavity part. The side wall includes a number of through holes. The air suction box is connected to a negative pressure device and a negative pressure is formed in the air suction box.

[0013] Among them, the air suction box includes an air suction port. The air suction port includes a first area and a second area. Among them, at least a part of the first area is opposite to the gap.

[0014] Among them, the bottom roller includes a first fitting area. After the wet embossed paper web adheres to the first fitting area, it is transferred to the drying roller. An outer heating device is also arranged at a position corresponding to the first fitting area on the outer side of the bottom roller.

[0015] Among them, an inner heating device is also arranged inside the first fitting area.

[0016] Among them, the drying roller further includes a hot air box disposed outside the drying roller, and the hot air box is configured to blow hot air flow onto the wet embossed paper web. The outer surface of the side wall includes a second bonding area, and the second bonding area includes a drying area and a transfer area. Among them, the hot air box is correspondingly arranged with the drying area, and the transfer area is correspondingly arranged with the first area.

[0017] Among them, the area of the drying area is greater than or equal to 40% of the area of the outer surface of the side wall.

[0018] Among them, the upper forward roller is configured to be adjustable to move upward in the direction of the transfer roller.

[0019] Beneficial effects: The present utility model provides a device for forming high-bulk tissue paper, including: a humidifying unit for humidifying the base paper web to form a wet paper web; an embossing unit for embossing the wet paper web to form a wet embossed paper web; a drying unit for drying the embossed paper web to form a dry embossed paper web; the humidifying unit, the embossing unit, and the drying unit are arranged in sequence. Among them, the humidifying unit includes at least one humidifying component, and the humidifying component includes a plurality of supporting rollers, a transfer belt wound around the supporting rollers, and a transfer roller. The supporting rollers include a forward roller correspondingly arranged with the transfer roller. At least a part of the transfer roller is immersed in a water tank for transferring water to the transfer belt. The transfer belt includes a first humidifying section located downstream of the forward roller. The first humidifying section abuts against the base paper web and wets the base paper to form a wet paper web. By the above method, the distribution of water can be made more uniform, thereby ensuring the accuracy of the addition amount, not easily occurring unexpected paper breakage phenomenon, thereby improving the production speed. At the same time, this method can also further improve the bulk of the paper. Description of the Drawings

[0020] Figure 1 Schematic diagram of the device for forming high-bulk tissue paper of the present utility model;

[0021] Figure 2 For Figure 1 Schematic diagram of the humidifying unit;

[0022] Figure 3 For Figure 1 Schematic diagram of the embossing unit and the drying unit in

[0023] Base paper web 401; wet paper web 402; wet embossed paper web 403; dry paper web 404; humidifying unit 10; upper humidifying assembly 11; first upper supporting roller 111; second upper supporting roller 112; upper forward extending roller 113; upper transfer belt 114; first transfer section 1141; first humidifying section 1142; upper transfer roller 115; upper water tank 116; upper abutting roller 117; lower humidifying assembly 12; first lower supporting roller 121; second lower supporting roller 122; lower forward extending roller 123; lower transfer belt 124; second transfer section 1141; second humidifying section 1142; lower transfer roller 115; lower water tank 116; embossing unit 20; embossing roller 21; bottom roller 22; first bonding area 221; gap 222; outer heating device 223; inner heating device 224; drying unit 30; drying roller 31; second bonding area 311; transfer area 3111; drying area 3112; suction box 312; first area 3121; second area 3122; hot air box 313. Detailed implementation manners

[0024] An embodiment of the present utility model provides a device for forming a high bulk tissue paper. The following will further describe the present application with reference to the accompanying drawings.

[0025] Please refer to the attached Figures 1 to 3 The device includes a humidifying unit 10, an embossing unit 20, and a drying unit 30 arranged in sequence.

[0026] The humidifying unit 10 is used to humidify the base paper web 401 to form a wet paper web 402. It can be understood that an unwinding unit may be included upstream of the humidifying unit 10 for unwinding the base paper web 401.

[0027] Generally, the base paper web 401 is wound around a tubular body such as a paper core tube to form a paper roll. The unwinding unit includes an unwinding rack for placing the paper roll and a unwinding device for releasing the base paper web 401 on the paper roll. The structure of these unwinding devices can be, for example, a unwinding belt that drives the paper roll by friction, which will not be elaborated here.

[0028] The humidifying unit 10 includes at least one humidifying assembly. In this embodiment, the humidifying assembly includes an upper humidifying assembly 11 and a lower humidifying assembly 12, which are respectively arranged on both sides of the base paper web 401 to humidify the base paper web 401 from both sides. It can be understood that in some specific embodiments, only one humidifying assembly may be provided to humidify the base paper web 401 from the upper side or the lower side. However, when humidifying from both sides simultaneously, it can make the humidifying effect on both sides of the base paper web 401 more uniform, and can enable the base paper web 401 to uniformly obtain a suitable humidifying effect in a shorter time. Therefore, preferably, two humidifying assemblies should be arranged to humidify the base paper web 401 from the upper side and the lower side respectively.

[0029] In this embodiment, the structures of the upper humidifying assembly 11 and the lower humidifying assembly 12 are basically the same. Specifically, the upper humidifying assembly 11 includes a plurality of upper supporting rollers, an upper transfer belt 114 wound around the upper supporting rollers, and an upper transfer roller 115. The lower humidifying assembly 12 includes a plurality of lower supporting rollers, a lower transfer belt 124 wound around the lower supporting rollers, and a lower transfer roller 115. Among them, the upper supporting rollers at least include a first upper supporting roller 111, a second upper supporting roller 112, and a front extending upper roller 113. The lower supporting rollers at least include a first lower supporting roller 121, a second lower supporting roller 122, and a front extending lower roller 123. The front extending upper roller 113 and the upper transfer roller 115 are correspondingly arranged. The front extending lower roller 123 and the lower transfer roller 115 are correspondingly arranged. The corresponding arrangement means that the front extending upper roller 113 and the upper transfer roller 115 are adjacently arranged to form a gap. The upper transfer belt 114 passes through this gap. Similarly, the lower transfer belt 124 passes through the gap between the front extending lower roller 123 and the lower transfer roller 115. At the same time, the upper transfer roller 115 abuts against the upper transfer belt 114 at the position corresponding to the front extending upper roller 113.

[0030] The upper humidifying assembly 11 further includes an upper water tank 116 for containing water. At least a part of the upper transfer roller 115 is immersed under the water surface, and is used for coating water on the upper transfer belt 114 when the upper transfer roller 115 rotates. Preferably, the upper transfer roller 115 is a reticulated roller.

[0031] Furthermore, the upper transfer roller 115 includes a coating layer, and the coating layer is an elastic material.

[0032] Furthermore, the upper humidifying assembly 11 further includes an upper abutting roller 117 that abuts against the upper transfer roller 115. The upper abutting roller 117 is configured to adjustably apply pressure to the upper transfer roller 115, so as to adjust the amount of water on the upper transfer roller 115 and evenly distribute the water on the upper transfer roller 115.

[0033] It can be understood that the lower humidifying assembly 12 includes a lower water tank 116. A part of the lower transfer roller 115 is immersed in the lower water tank 116 and abuts against the lower transfer belt 124.

[0034] The upper transfer belt 114 and the lower transfer belt 124 described above can be water-retaining or waterproof. When the upper transfer belt 114 and the lower transfer belt 124 are water-retaining, the upper transfer belt 114 and the lower transfer belt 124 can be felt or blanket, that is, the water is carried by the water-containing felt or blanket to wet the base paper web 401. When the upper transfer belt 114 and the lower transfer belt 124 are waterproof, the upper transfer belt 114 and the lower transfer belt 124 can be rubber bands, plastic films or metal belts. By forming a water film on the surfaces of the upper transfer belt 114 and the lower transfer belt 124, the water film contacts the base paper web 401, so that the base paper web 401 is wetted to form a wet paper web 402. In this embodiment, the upper transfer belt 114 includes a first humidifying section 1142, and the first humidifying section 1142 contacts the base paper web 401 and wets the base paper to form a wet paper web 402. The lower transfer belt 124 includes a second humidifying section 1142. Similarly, the second humidifying section 1142 contacts the base paper web 401 and wets the base paper to form a wet paper web 402.

[0035] It can be understood that the first humidifying section 1142 is located in the downstream direction of the upper transfer roller 115, and the second humidifying section 1142 is located in the downstream direction of the lower transfer roller 115.

[0036] When the upper humidifying assembly 11 and the lower humidifying assembly 12 are provided simultaneously, the first humidifying section 1142 and the second humidifying section 1142 are arranged correspondingly, and a clamping area is formed between the first humidifying section 1142 and the second humidifying section 1142. The base paper web 401 is clamped in the clamping area and wetted by the first humidifying section 1142 and the second humidifying section 1142 from both sides.

[0037] In this embodiment, the first humidifying section 1142 is located between the first upper supporting roller 111 and the second upper supporting roller 112, and the second humidifying section 1142 is located between the first lower supporting roller 121 and the second lower supporting roller 122.

[0038] Furthermore, the first humidifying section 1142 and the second humidifying section 1142 are arranged in parallel at intervals.

[0039] Furthermore, upstream of the first humidifying section 1142, a first transfer section 1141 is further included between the upper forward roller 113 and the first upper supporting roller 111. The first transfer section 1141 is linear, and the first transfer section 1141 is inclined to the first humidifying section 1142. An included angle of 120° to 155° is formed between the first transfer section 1141 and the first humidifying section 1142.

[0040] Similarly, the lower transfer belt 124 includes a second humidifying section 1142, and the second transfer section 1141 is symmetrically arranged with the first transfer section 1141.

[0041] Further, the upper forward roller 113 is configured to move adjustably in the direction of the upward transfer roller 115 to adjust the thickness of the water film or the moisture content on the upper transfer belt 114, so that the formed wet paper web 402 has a predetermined moisture content. More specifically, when the upper transfer belt 114 is made of a water-receiving material, the clamping force between the upper forward roller 113 and the upper transfer roller 115 is adjusted to adjust the extrusion pressure on the upper transfer belt 114, thereby adjusting the moisture content on the upper transfer belt 114 to adjust the wetting degree of the base paper web 401. When the upper transfer belt 114 is made of a water-impermeable material, the clamping force between the upper forward roller 113 and the upper transfer roller 115 is adjusted. On the one hand, the water film is flattened, and on the other hand, the thickness of the water film can be adjusted, thereby adjusting the wetting degree of the base paper web 401.

[0042] The embossing unit 20 is arranged downstream of the humidifying unit 10 and is used to emboss the wet paper web 402 to form a wet embossed paper web 403. The embossing unit 20 includes a set of embossing rollers 21. The set of embossing rollers 21 includes an embossing roller 21 and a bottom roller 22. A predetermined embossing protrusion is arranged on the embossing roller 21 to form a predetermined embossing pattern on the wet paper web 402. In this embodiment, the set of embossing rollers 21 is preferably of the point-to-flat embossing form. Of course, it can also be of the point-to-point or point-to-concave form, which is not limited herein.

[0043] The drying unit 30 is arranged downstream of the drying unit 30 and is used to dry the wet embossed paper web 403 to form a dry paper web 404. In this embodiment, the drying unit 30 includes a drying roller 31. When the wet embossed paper web 403 passes through the drying roller 31, it is dried by the drying roller 31 to form a dry paper web 404.

[0044] In this embodiment, the drying roller 31 is arranged adjacent to the bottom roller 22, and there is a gap 222 between the drying roller 31 and the bottom roller 22. In this embodiment, the bottom roller 22 further includes a first fitting surface. The wet embossed paper web 403 adheres to the first fitting surface and moves downstream, and after passing through the gap 222, it is transferred and adheres to the drying roller 31 and is dried by the drying roller 31.

[0045] Specifically, the drying roller 31 is in a cylindrical shape and includes a side wall and a cavity part formed by the side wall. An air suction box 312 is arranged in the cavity part. The side wall includes a plurality of through holes. The air suction box 312 is connected to a negative pressure device, and a negative pressure is formed in the air suction box 312, so that on the one hand, the water-containing air flow can be discharged through the air suction box 312, and on the other hand, the drying process is accelerated by the negative pressure effect.

[0046] Further, the suction box 312 includes a suction port, and the suction port includes a first zone 3121 and a second zone 3122. Among them, at least a part of the first zone 3121 faces the gap 222, so that the wet embossed paper web 403 can be smoothly transferred to the drying roller 31 after passing through the gap 222.

[0047] Further, the drying roller 31 further includes a hot air box 313 disposed outside the drying roller 31. The hot air box 313 is configured to blow hot air flow onto the wet embossed paper web 403 for drying.

[0048] Further, the outer surface of the side wall includes a second fitting zone 311. The second fitting zone 311 includes a drying zone 3112 and a transfer zone 3111. Among them, the hot air box 313 is correspondingly arranged with the drying zone 3112, and the transfer zone 3111 is correspondingly arranged with the first zone 3121, so that the wet embossed paper web 403 can be smoothly transferred from the bottom roller 22 to the drying roller 31 and can be quickly dried through the drying unit 30.

[0049] Further, the area of the drying zone 3112 is greater than or equal to 40% of the area of the outer surface of the side wall.

[0050] Further, an outer heating device 223 is also provided at a position corresponding to the first fitting zone 221 on the outside of the bottom roller 22 to further accelerate the drying of the wet embossed paper web 403.

[0051] Further, an inner heating device 224 may also be provided inside the first fitting zone 221. The inner heating device 224 may be an electric heating device or a device that heats the first fitting zone 221 by introducing a heating medium into the interior. The heating medium may be steam or oil.

[0052] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A device for forming high bulk tissue paper, characterized in that: include: A humidifying unit, used for humidifying the base paper web to form a wet paper web; An embossing unit, used for embossing a wet paper web to form a wet embossed paper web; A drying unit, used for drying the embossed paper web to form a dry embossed paper web; The humidifying unit, embossing unit and drying unit are arranged in sequence, wherein the humidifying unit includes at least one humidifying component, the humidifying component includes a plurality of rollers, a transfer belt wound on the rollers and a transfer roller, the rollers include a forward roller arranged corresponding to the transfer roller, at least a portion of the transfer roller is immersed in a water tank for transferring water to the transfer belt, the transfer belt includes a humidifying section located downstream of the forward roller, the humidifying section contacts with the base paper web and moistens the base paper to form a wet paper web, the embossing unit includes an embossing roller and a bottom roller, the drying unit includes a drying roller, the drying roller is adjacent to the bottom roller and has a gap with the bottom roller, the wet embossed paper web is attached to the bottom roller and moves through the gap, and then is attached to the drying roller and dried by the drying roller.

2. The device according to claim 1, characterized in that The humidifying component includes an upper humidifying component and a lower humidifying component, which are respectively arranged on both sides of the base paper web. The upper humidifying component includes a plurality of upper rollers, an upper transfer belt wound on the upper rollers and an upper transfer roller. The lower humidifying component includes a plurality of lower rollers, a lower transfer belt wound on the lower rollers and a lower transfer roller. The upper rollers include at least a first upper roller, a second upper roller and an upper forward roller. The lower rollers include at least a first lower roller, a second lower roller and a lower forward roller. The upper forward roller is arranged correspondingly to the upper transfer roller, and the lower forward roller is arranged correspondingly to the lower transfer roller. The upper transfer belt includes a first humidifying section, which is in contact with the base paper web. The lower transfer belt includes a second humidifying section, which is in contact with the base paper web.

3. The device according to claim 2, characterized in that Upstream of the first humidifying section, a first transfer section is also included between the upper forward roller and the first upper supporting roller. The first transfer section is straight and inclined to the first humidifying section. An angle of 120° to 155° is formed between the first transfer section and the first humidifying section.

4. The device according to claim 3, characterized in that The drying roller is in a cylindrical shape, including a side wall and a cavity formed by the side wall. A suction box is arranged in the cavity. The side wall includes a plurality of through holes. The suction box is connected to a negative pressure device and forms a negative pressure in the suction box.

5. The device according to claim 4, characterized in that The air suction box comprises an air suction port, and the air suction port comprises a first area and a second area, wherein at least a portion of the first area is opposite to the gap.

6. The device according to claim 5, characterized in that The bottom roller comprises a first laminating area, the wet embossed paper web is attached to the first laminating area and then transferred to the drying roller, and an outer heating device is also arranged at a position corresponding to the first laminating area on the outer side of the bottom roller.

7. The device according to claim 6, characterized in that An inner heating device is also arranged inside the first laminating area.

8. The device according to claim 5, characterized in that The drying roller also includes a hot air box arranged on the outside of the drying roller, and the hot air box is configured to blow a hot air flow toward the wet embossed paper web. The outer surface of the side wall includes a second bonding area, and the second bonding area includes a drying area and a transfer area, wherein the hot air box is arranged corresponding to the drying area, and the transfer area is arranged corresponding to the first area.

9. The device according to claim 8, characterized in that The area of ​​the drying zone is greater than or equal to 40% of the outer surface area of ​​the side wall.

10. The device according to claim 8, characterized in that The upper reach roller is configured to be adjustable and move in the direction of the upward transfer roller.

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