Core forming device

Abstract

This utility model provides a core forming device, comprising: a forming cylinder having an internal space and rotatably arranged around a central line; the internal space further comprising a first adsorption cavity having a first adsorption port and a second adsorption cavity having a second adsorption port; a first distribution box and a second distribution box arranged sequentially along the rotation direction of the forming cylinder; the first distribution box comprising a first distribution cavity having a first distribution port, and the second distribution box comprising a second distribution cavity having a second distribution port; the first distribution port is directly opposite the first adsorption port, and the second distribution port is directly opposite the second adsorption port; the second adsorption port further comprises a forward extension area extending to the first adsorption port. This arrangement allows for the flexible formation of a composite core, while ensuring that the mixed absorbent fibers are located in the center of the core, thereby ultimately forming a whole core and significantly reducing delamination.

Description

Technical Field

[0001] This utility model relates to a core forming device. Background Technology

[0002] In disposable hygiene products, the core is the main absorbent carrier of liquid, and it is usually formed by the entanglement and stacking of dispersed fluff pulp fibers.

[0003] Existing equipment for forming the core of disposable sanitary products typically includes a forming box, a forming cylinder connected to a negative pressure, and a transfer roller for transferring the core from the forming cylinder to a substrate. A mold with a structure corresponding to the shape of the core is fixed on the forming cylinder. The mold includes a forming cavity and a forming mesh at the bottom of the cavity. The forming box fills the forming cavity with absorbent material by means of air force to form a core with the same shape as the forming cavity. When the forming cavity rotates to the position corresponding to the transfer roller, the transfer roller adsorbs the core from the forming cavity onto the transfer roller and transfers it to the web on the conveyor line. Specific devices are shown in documents such as JP2006115911A.

[0004] The aforementioned devices can typically only form a core with a single structure. With social development, people hope to develop cores with composite structures, or cores with different absorbent fibers. To this end, documents such as CN202288651U and WO2005072671A1 have proposed setting two distribution boxes around the forming cylinder to form a core with a composite structure in one go. However, in practice, it has been found that the composite core formed by these arrangement devices has a serious delamination phenomenon, which limits or affects the core's absorption performance.

[0005] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Utility Model Content

[0006] Therefore, this utility model provides a core forming device to solve the above-mentioned technical problems.

[0007] A core forming apparatus, comprising,

[0008] The molding cylinder includes an internal space and is rotatably arranged around a central line. The internal space also includes a first adsorption chamber with a first adsorption port and a second adsorption chamber with a second adsorption port.

[0009] A first distribution box and a second distribution box are arranged sequentially along the rotation direction of the forming cylinder;

[0010] The first distribution box includes a first distribution cavity with a first distribution port, and the second distribution box includes a second distribution cavity with a second distribution port. The first distribution port is directly opposite to the first adsorption port, and the second distribution port is directly opposite to the second adsorption port. The second adsorption port also includes a forward extension area extending to the area corresponding to the first adsorption port.

[0011] The internal space includes an adsorption box, which is equipped with a first partition and a second partition. The first partition and the second partition divide the adsorption box into a first adsorption chamber, a second adsorption chamber, and a third adsorption chamber. The first distribution box includes a first side plate adjacent to the second distribution box, and the second distribution box includes a second side plate adjacent to the first distribution box. The side plate includes a lower end. A first virtual plane is defined to pass through the lower end and the center line. The angle between the first virtual plane and the first partition is α, where α = 3°-6°.

[0012] The first side plate and the second side plate intersect at the lower end.

[0013] The first side plate and the second side plate are inclined to the first partition and the first virtual plane.

[0014] The second distribution cavity includes a main distribution cavity and an extended distribution cavity. The extended distribution cavity is located downstream of the main distribution cavity. The extended distribution cavity includes an extended distribution port and an extended air guide plate opposite to the extended distribution port. The extended air guide plate is parallel to the extended distribution port.

[0015] The extended dispersion cavity includes an extended inlet and an extended tail plate facing away from the extended inlet. The plane where the extended tail plate is located is called the extended plane. The extended plane passes through the center line and divides the second adsorption port into a main adsorption area and a rear extension area. The rear extension area is located outside the extended plane and is connected to the outside atmosphere.

[0016] Wherein, the angle between the second partition and the extending plane is β, then β = 2°-6°.

[0017] A brush body is provided in the extended distribution cavity. The brush body includes a rotation axis. The second virtual plane is defined to pass through the rotation axis and the center line. The angle between the second virtual plane and the extended plane is 14°-18°.

[0018] The internal space is further provided with a positive pressure box, which includes a separation chamber. Below the forming cylinder, there is also a recovery box with a recovery chamber, which includes a material collection port. At least a portion of the material collection port corresponds to the separation chamber.

[0019] The core forming device further includes a crushing device, which includes a first crusher and a second crusher. The first crusher is connected to a first distribution box, and the second crusher is connected to a second distribution box.

[0020] Beneficial Effects: This utility model provides a core forming device, comprising: a forming cylinder having an internal space and rotatably arranged around a central line; the internal space further comprising a first adsorption cavity having a first adsorption port and a second adsorption cavity having a second adsorption port; a first distribution box and a second distribution box arranged sequentially along the rotation direction of the forming cylinder; the first distribution box comprising a first distribution cavity having a first distribution port, and the second distribution box comprising a second distribution cavity having a second distribution port; the first distribution port is directly opposite the first adsorption port, and the second distribution port is directly opposite the second adsorption port; the second adsorption port further comprises a forward extension area extending to the first adsorption port. Through the above arrangement, a composite core can be flexibly formed, and the mixed absorbent fibers can be located in the middle of the core, thereby making the entire core ultimately form a whole and significantly reducing delamination. Attached Figure Description

[0021] Figure 1 A schematic diagram of the core forming device according to an embodiment of this utility model;

[0022] Figure 2 for Figure 1 Schematic diagram of airflow direction in the intermediate forming cylinder, the first distribution box, and the second distribution box;

[0023] Figure 3 for Figure 2 Enlarged diagram of area A in the middle;

[0024] Figure 4 for Figure 2 Enlarged diagram of area B in the middle;

[0025] Component descriptions in the diagram:

[0026] Forming cylinder 10; Centerline 100; First adsorption chamber 101; First adsorption port 1010; Second adsorption chamber 102; Second adsorption port 1020; Main adsorption area 1021; Rear extension area 1022; Third adsorption chamber 103; Adsorption box 11; Front plate 111; First partition 112; Second partition 113; Rear plate 114; Positive pressure box 12; Separation chamber 121; First distribution box 20; First distribution cavity 21; First distribution port 210; First side plate 211; Second distribution box 30; Second distribution cavity 300; Main Distribution chamber 31; main distribution port 310; forward extension area 3100; main distribution area 3101; second side plate 311; lower end 3110; first virtual plane 3111; extended distribution chamber 32; extended distribution port 320; extended inlet 321; extended tail plate 322; extended plane 3220; extended air guide plate 323; brush body 33; rotation axis 330; second virtual plane 3300; first crusher 41; second crusher 42; SAP spreading device 43; transfer roller 50; recovery box 60; recovery chamber 61. Detailed Implementation

[0027] Please refer to the reference. Figures 1-4 This utility model provides a core forming device for forming a three-dimensional network-like porous structure of absorbent material. These porous structures are commonly used in disposable hygiene products as the main body fluid absorbent material. These porous structures are also referred to as cores. The core forming device includes a forming cylinder 10 and a first distribution box 20 and a second distribution box 30 disposed around the forming cylinder 10.

[0028] The molding cylinder 10 is generally cylindrical, including side walls and a cylinder wall on the outer periphery. Several molds (not shown) with molding cavities are provided on the cylinder wall. The absorbent material is filled into the molding cavity and forms the core after demolding. More specifically, the bottom of the molding cavity includes a molding mesh. When the absorbent material moves towards the molding mesh with the airflow, the absorbent material is stacked and deposited in the molding cavity under the interception effect of the molding mesh to form an interwoven three-dimensional network structure.

[0029] The forming cylinder 10 includes an internal space and is configured to rotate about a center line 100. In a specific embodiment, the forming cylinder 10 includes a rotating shaft connected to a driving device. The side wall is fixedly connected to the rotating shaft so that the forming cylinder 10 is driven to rotate about the center line 100 when the rotating shaft rotates. The internal space is the space between the rotating shaft and the side wall. The internal space also includes a first adsorption cavity 101 with a first adsorption port 1010 and a second adsorption cavity 102 with a second adsorption port 1020.

[0030] Specifically, an adsorption box 11 is provided in the internal space. The adsorption box 11 is configured to be connected to a negative pressure device, so that the adsorption chamber is in a negative pressure state. The adsorption box 11 is divided into several adsorption chambers by several partitions. In this embodiment, the partitions include a first partition 112 and a second partition 113. The first partition 112 and the second partition 113 divide the adsorption box 11 into a first adsorption chamber 101, a second adsorption chamber 102 and a third adsorption chamber 103. At the same time, the first adsorption chamber 101 includes a first adsorption port 1010 facing the cylinder wall, the second adsorption chamber 102 includes a second adsorption port 1020 facing the cylinder wall, and the third adsorption chamber 103 includes a third adsorption port. In addition, the adsorption box 11 also includes a front plate 111 located in the upstream direction and a rear plate 114 located in the downstream direction.

[0031] Understandably, in another embodiment, multiple independent adsorption boxes 11 can be provided in the internal space, each independent adsorption box 11 having a corresponding adsorption cavity and an adsorption port provided on the adsorption cavity.

[0032] On the outside of the forming cylinder 10, a first distribution box 20 and a second distribution box 30 are sequentially arranged along the rotation direction of the forming cylinder 10. The first distribution box 20 includes a first distribution cavity 21 with a first distribution port 210, and the second distribution box 30 includes a second distribution cavity 300 with a second distribution port. The first distribution port 210 corresponds to the first adsorption port 1010, and the second distribution port corresponds to the second adsorption port 1020. The second adsorption port 1020 also includes a forward extension area 3100 extending to the first adsorption port 1010.

[0033] Understandably, the first distribution port 210 and the second distribution port are configured to distribute absorbent material, and the first distribution cavity 21 and the second distribution cavity 300 are configured to receive, contain, and mix absorbent material. The absorbent material can be fiber, such as fluff pulp fiber or synthetic fiber or other suitable fiber material, or a mixture of fiber and superabsorbent polymer (SAP). A fiber dispersing device and a conveying device are provided upstream of the first distribution box 20 and the second distribution box 30 to deliver the absorbent material, such as fiber or a mixture of fiber and superabsorbent polymer, to the corresponding distribution cavity. Preferably, the conveying device is a pneumatic conveying device to create a positive pressure state in the distribution cavity and to facilitate the distribution of absorbent material through the distribution port. Specifically, the fiber dispersion device is a crushing device. The crushing device crushes and separates the fiber raw material, such as fluff pulp board, to form dispersed fibers, which are then easily conveyed by air and, after being dispersed, wound and stacked in the forming cavity to form a network structure. In this embodiment, the crushing device includes a first crusher 41 and a second crusher 42. The first crusher 41 is connected to the first dispersing box 20, and the second crusher 42 is connected to the second dispersing box 30.

[0034] In addition, it is understood that the first distribution cavity 21 and the second distribution cavity 300 can receive the same or different absorbent materials to form a suitable core. More specifically, when the first distribution cavity 21 and the second distribution cavity 300 receive different absorbent materials, the absorbent materials in the first distribution cavity 21 and the absorbent materials in the second distribution cavity 300 can have different characteristics such as type, ratio, and properties.

[0035] Furthermore, an SAP spreading device 43 is provided between the second spreading box 30 and the second pulverizer 42 to spread SAP (Super Absorbent Polymer) in the second spreading chamber 300. In this case, SAP can be spread only in the second spreading chamber 300, so that the absorbent material in the first spreading chamber 21 and the absorbent material in the second spreading chamber 300 are different in type, properties and ratio.

[0036] In addition, the first distribution box 20 and the second distribution box 30 are arranged sequentially along the rotation direction of the molding cylinder 10. This means that the first distribution box 20 is located upstream of the molding cylinder 10 in the rotation direction, and the second distribution box 30 is located downstream of the molding cylinder 10 in the rotation direction. When the molding cavity is filled with absorbent material, the first distribution cavity 21 first fills the molding cavity through the first distribution port 210. Then the molding cavity rotates to the area corresponding to the second distribution port, and the second distribution cavity 300 fills the molding cavity with absorbent material through the second distribution port to form a core.

[0037] Please refer to this as well. Figure 2 and Figure 3 The first distribution cavity 21 and the second distribution cavity 300 are under positive pressure, while the first adsorption cavity 101 and the second adsorption cavity 102 are under negative pressure. Airflow carrying absorbent material flows from the positive pressure first distribution cavity 21 and the second distribution cavity 300 to the negative pressure first adsorption cavity 101 and the second adsorption cavity 102. Simultaneously, the second distribution port includes a main distribution area 3101 corresponding to the second adsorption port 1020 and a forward extension area 3100 extending to the first adsorption port 1010. The absorbent fibers distributed by the first distribution port 210 and the absorbent fibers distributed by the forward extension area 3100 are located in the lower part of the forward extension area 3100. The mixture is formed, and since the forward extension zone 3100 is located upstream of the second dispersing port, the mixed absorbent fibers can be located in the middle of the core, so that the entire core eventually forms a whole, greatly reducing the stratification phenomenon. In particular, when the first dispersing cavity 21 and the second dispersing cavity 300 disperse different absorbent materials, such as the first dispersing cavity 21 dispersing hardwood pulp with a fiber length of 1.0-1.2 mm, while the second dispersing cavity 300 dispersing softwood pulp with a fiber length of 2.5-3.7 mm and absorbent material formed by SAP with a particle size of 80-200 μm, the stratification phenomenon is reduced by an average of 32%.

[0038] Furthermore, both the first adsorption cavity 101 and the second adsorption cavity 102 are fan-shaped.

[0039] Furthermore, the first partition 112 extends from the cylinder wall toward the centerline 100, and the second distribution box 30 includes a second side plate 311 adjacent to the first distribution box 20. The side plate includes a lower end 3110. It can be understood that the lower end 3110 is the end of the second side plate 311 closest to the cylinder wall. The first virtual plane 3111 is defined to pass through the lower end 3110 and the centerline 100. The angle between the first virtual plane 3111 and the first partition 112 is α, then α = 3°-6°.

[0040] Furthermore, the second side plate 311 is inclined to the first partition 112 and the first virtual plane 3111.

[0041] Furthermore, the first distribution box 20 includes a first side plate 211 in the direction adjacent to the second distribution box 30. The first side plate 211 intersects with the second side plate 311 at the lower end 3110. At the same time, the first side plate 211 is also inclined to the first partition 112 and the first virtual plane 3111.

[0042] Understandably, there is a fan-shaped area between the first virtual plane 3111 and the first partition 112, which creates a slit effect at that location, resulting in a stronger mixing effect.

[0043] Furthermore, the second distribution cavity 300 includes a main distribution cavity 31 and an extended distribution cavity 32. The main distribution cavity 31 includes a main distribution port 310. The extended distribution cavity 32 is located downstream of the main distribution cavity 31. The extended distribution cavity 32 includes an extended inlet 321 and an extended tail plate 322 facing away from the extended inlet 321. The extended distribution cavity 32 includes an extended distribution port 320, which is parallel to the cylinder wall. At the same time, the extended distribution cavity 32 includes an extended air guide plate 323 opposite to the extended distribution port 320, which is parallel to the extended distribution port 320.

[0044] Furthermore, the plane containing the extended tail plate 322 passes through the center line 100 and is referred to as the extended plane 3220. The extended plane 3220 divides the second adsorption port 1020 into a main adsorption area 1021 and a rear extension area 1022. The main adsorption area 1021 corresponds to the extended distribution port 320. The rear extension area 1022 is located outside the extended plane 3220 and is connected to the outside atmosphere. It can be understood that after a negative pressure is formed in the second adsorption chamber 102, a slit effect is formed at the rear extension area 1022, so that the core passing through this area is subjected to inward airflow pressure, thereby reducing dust and making the core have a more stable structure.

[0045] Furthermore, the angle between the second partition 113 and the extending plane 3220 is β, then β = 2°-6°.

[0046] Furthermore, a brush body 33 is provided in the extended dispersing cavity 32 for cleaning and leveling the surface of the formed core. The brush body 33 includes a rotation axis 330. The second virtual plane 3300 is defined to be perpendicular to the center line 100 through the rotation axis 330. The angle between the second virtual plane 3300 and the extended plane 3220 is 14°-18°.

[0047] Furthermore, the internal space is also provided with a positive pressure box 12, which includes a separation chamber 121 for allowing the core located in the molding cavity to be ejected from the molding cavity. The core molding device also includes a transfer roller 50 disposed downstream of the molding cylinder 10. After the core is ejected from the molding cavity, it is transferred to the transfer roller 50 and then transferred by the transfer roller 50 to the downstream conveying device.

[0048] Furthermore, a recycling box 60 with a recycling chamber 61 is provided below the forming cylinder 10. The recycling chamber 61 includes a material collection port, at least a portion of which corresponds to the separation chamber 121 to collect absorbent material remaining in the forming mesh or other locations.

[0049] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A core forming apparatus characterized by comprising: include: The molding cylinder includes an internal space and is rotatably arranged around a central line. The internal space also includes a first adsorption chamber with a first adsorption port and a second adsorption chamber with a second adsorption port. A first distribution box and a second distribution box are arranged sequentially along the rotation direction of the forming cylinder; The first distribution box includes a first distribution cavity with a first distribution port, and the second distribution box includes a second distribution cavity with a second distribution port. The first distribution port is directly opposite to the first adsorption port, and the second distribution port is directly opposite to the second adsorption port. The second adsorption port also includes a forward extension area extending to the area corresponding to the first adsorption port.

2. The core building apparatus according to claim 1, wherein The internal space includes an adsorption box, which is equipped with a first partition and a second partition. The first partition and the second partition divide the adsorption box into a first adsorption chamber, a second adsorption chamber, and a third adsorption chamber. The first distribution box includes a first side plate adjacent to the second distribution box, and the second distribution box includes a second side plate adjacent to the first distribution box. The side plate includes a lower end. A first virtual plane is defined to pass through the lower end and the center line. The angle between the first virtual plane and the first partition is α, where α = 3°-6°.

3. The core building apparatus according to claim 2, wherein The first side plate and the second side plate intersect at the lower end.

4. The core building apparatus according to claim 3, wherein The first side plate and the second side plate are inclined to the first partition and the first virtual plane.

5. The core building apparatus according to claim 2, wherein The second distribution chamber includes a main distribution chamber and an extended distribution chamber. The extended distribution chamber is located downstream of the main distribution chamber. The extended distribution chamber includes an extended distribution port and an extended air guide plate opposite to the extended distribution port. The extended air guide plate is parallel to the extended distribution port.

6. The core building apparatus according to claim 5, wherein The extended distribution cavity includes an extended inlet and an extended tail plate facing away from the extended inlet. The plane in which the extended tail plate is located is called the extended plane. The extended plane passes through the center line and divides the second adsorption port into a main adsorption area and a rear extension area. The rear extension area is located outside the extended plane and is connected to the outside atmosphere.

7. The core building apparatus according to claim 6, wherein If the angle between the second partition and the extending plane is β, then β = 2°~6°.

8. The core building apparatus of claim 6 wherein, A brush body is provided in the extended distribution cavity. The brush body includes a rotation axis. A second virtual plane is defined to pass through the rotation axis and the center line. The angle between the second virtual plane and the extended plane is 14° to 18°.

9. The core building apparatus of claim 6 wherein, The internal space is also provided with a positive pressure box, which includes a separation chamber. Below the forming cylinder, there is also a recovery box with a recovery chamber, which includes a material collection port. At least a portion of the material collection port corresponds to the separation chamber.

10. The core building apparatus of claim 1 wherein, The core forming device further includes a crushing device, which includes a first crusher and a second crusher. The first crusher is connected to a first distribution box, and the second crusher is connected to a second distribution box.

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