Absorption core forming system
By adjusting the mesh opening ratio and draft angle of the three-dimensional and two-dimensional parts of the screen, the problems of insufficient protrusion of the three-dimensional core and low basis weight were solved, thus improving the molding quality of the absorbent core.
Patent Information
- Application Number
- CN202423047325.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2034-12-10
AI Technical Summary
In the existing technology, the mesh opening ratio of the planar part and the three-dimensional part of the screen is the same, which results in the absorbent pulp not protruding significantly at the three-dimensional core position, the basis weight being small, and the small draft angle causing cotton shortage at the end of the three-dimensional core, affecting the molding quality of the absorbent core.
The mesh opening ratio of the three-dimensional part of the screen is set to be greater than that of the flat part, and the draft angle is set to be greater than 20°. This increases the orthographic projection area of the three-dimensional part and the width of the sidewall, ensuring that the three-dimensional part of the absorbent core protrudes significantly and that the weight of the three-dimensional part meets the set value.
Ensure that the three-dimensional part of the absorbent core is clearly convex, and ensure the molding quality of the absorbent core.
Smart Images
Figure CN223759991U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of disposable hygiene product manufacturing equipment technology, and in particular to sanitary napkins, sanitary pants, etc., specifically an absorbent core forming system. Background Technology
[0002] The absorbent core in disposable hygiene products, such as sanitary napkins, can generally be divided into planar cores and (3D) three-dimensional cores. The three-dimensional core is a portion protruding from the planar core structure in the central absorbent area. The manufacturing equipment for this absorbent core includes a screen for molding the absorbent core. This screen has a mesh structure, its main feature being that it provides a breathable environment, allowing gas to pass through, while the absorbent pulp (crushed paper pulp raw material) and polymer mixture used to prepare the absorbent core are adsorbed onto the screen surface. The screen has planar and three-dimensional portions. The planar portion corresponds to the planar core of the absorbent core, while the three-dimensional portion has a concave structure compared to the planar portion and corresponds to the three-dimensional core of the absorbent core. In related technologies, the opening ratio of the mesh in the planar and three-dimensional parts of the screen is usually set to be the same. However, from the product perspective, the absorbent slurry required for the absorbent core in the three-dimensional core position needs to protrude from the planar core and has a relatively large basis weight. Therefore, when the opening ratio of the screen is the same in the corresponding manufacturing equipment, it is difficult to ensure that the amount of absorbent slurry in the three-dimensional core position is greater than that in the planar core position. As a result, after demolding, the three-dimensional core part of the absorbent core does not protrude significantly and has a smaller basis weight, which directly affects the molding quality of the absorbent core.
[0003] Furthermore, the three-dimensional portion of the screen is concave, and the sidewalls connecting the three-dimensional and planar portions have a transition section. During manufacturing, these sidewalls develop a certain draft angle (typically around 20°). Because this draft angle is relatively small, the corresponding slope is quite steep. In this case, during the fiber accumulation process, along the counter-wind direction (opposite to the direction of the forming mold), one end of the screen (the end that first fills with the absorbent pulp and polymer mixture along the direction of the forming mold, i.e., the head) cannot be completely filled with absorbent pulp. This results in a lack of absorbent pulp (mixture of absorbent pulp and polymer) at the corresponding end (head) of the three-dimensional core, making the three-dimensional core incomplete and affecting the overall forming quality of the absorbent core.
[0004] Therefore, relevant solutions need to be proposed. Utility Model Content
[0005] This application provides an absorbent core molding system that sets different opening ratios for the planar and three-dimensional portions of a screen mesh, with the three-dimensional portion having a higher opening ratio than the planar portion. This ensures a pronounced convexity in the three-dimensional portion of the absorbent core and that its basis weight meets a set value. Furthermore, the draft angle α of the sidewall formed between the planar and three-dimensional portions is at least greater than 20°. As the draft angle increases, the corresponding projected area of the sidewall also increases, making the slope corresponding to the draft angle gentler. This increases the capacity of the head of the three-dimensional portion (the end that first fills with the absorbent pulp and polymer mixture along the molding die's running direction). During fiber deposition, more absorbent pulp is adsorbed onto the head of the three-dimensional portion of the screen mesh in the counter-winding direction, making the head of the three-dimensional portion complete and full, thereby improving the overall molding quality of the absorbent core.
[0006] This application provides an absorbent core forming system for preparing absorbent cores. The absorbent core includes a planar portion and a three-dimensional portion. The absorbent core forming system includes at least a fiber accumulation device. The fiber accumulation device includes a forming cavity, a cylindrical fiber accumulation drum, and multiple forming mold units disposed on the outer peripheral surface of the fiber accumulation drum. The outlet of the forming cavity corresponds to the forming mold unit and is used to transport the material for preparing the absorbent core to the forming mold unit for forming. The forming mold unit includes a forming plate and a screen disposed below the forming plate. The forming plate has an opening that matches the shape of the outer contour of the absorbent core. The screen has a mesh structure. The mesh includes a planar portion and a three-dimensional portion. The planar portion corresponds to the planar part of the absorbent core, and the three-dimensional portion corresponds to the three-dimensional part of the absorbent core. The open area ratio of the mesh in the three-dimensional portion is greater than that of the mesh in the planar portion. The three-dimensional portion has a concave structure. The planar portion surrounds the periphery of the three-dimensional portion and forms a sidewall for transitional connection between the three-dimensional portion and the planar portion. The sidewall has a draft angle α, which is at least greater than 20°. When the draft angle increases, the orthographic projection area of the sidewall also increases accordingly, thereby increasing the amount of material fibers forming the three-dimensional part of the absorbent core accommodated in the three-dimensional portion.
[0007] In some embodiments of this application, the aperture ratio of the mesh in the three-dimensional portion is 1.1 to 2.5 times that of the mesh in the planar portion.
[0008] In some embodiments of this application, the aperture ratio of the mesh in the planar portion is 20%-50%, and the aperture ratio of the mesh in the three-dimensional portion is 30%-65%.
[0009] In some embodiments of this application, the draft angle α of the sidewall ranges from 25° to 50°.
[0010] In some embodiments of this application, the molding unit further includes a molding module having a through stepped hole, the molding plate and the screen being installed in the stepped hole, wherein the screen is disposed below the molding plate.
[0011] In some embodiments of this application, the fiber drum has a partitioned structure inside, the partitioned structure including at least a negative pressure zone, and the forming cavity is provided corresponding to the negative pressure zone of the partitioned structure.
[0012] In some embodiments of this application, both the planar portion and the three-dimensional portion of the screen are in communication with the negative pressure zone, and the forming cavity is in communication with the screen.
[0013] In some embodiments of this application, the absorbent core forming system further includes a crushing device located upstream of the forming cavity and communicating with the forming cavity, the crushing device being configured to crush and de-fibril the material used to prepare the absorbent core into material fibers.
[0014] In some embodiments of this application, the centerline of the pulverizing device overlaps with the centerline of the fiber-accumulating drum along the main flow direction.
[0015] In some embodiments of this application, the centerline of the pulverizing device does not overlap with the centerline of the fiber-accumulating drum along the main flow direction, wherein the centerline of the fiber-accumulating drum is closer to the upstream side of the fiber-accumulating drum in the flow direction than the centerline of the pulverizing device.
[0016] This application provides an absorbent core forming system. By setting the opening ratio of the mesh in the planar part and the three-dimensional part of the screen to be different, wherein the opening ratio of the mesh in the three-dimensional part is greater than that in the planar part, the three-dimensional part of the absorbent core is significantly convex and its weight meets the set value.
[0017] Furthermore, the draft angle α of the sidewall formed between the planar part and the three-dimensional part is at least greater than 20°. When the draft angle increases, the corresponding orthographic projection area of the sidewall also increases accordingly, making the slope corresponding to the draft angle gentler. This increases the accommodating space of the head of the three-dimensional part (the end that first fills the absorbent pulp and polymer mixture along the running direction of the molding die). During the fiber deposition process, along the counter-wind direction, more absorbent pulp and polymer mixture are adsorbed onto the head of the three-dimensional part of the screen, making the head of the three-dimensional part complete and full, thereby improving the molding quality of the entire absorbent core.
[0018] Furthermore, along the main flow direction, by setting the centerline of the crushing device and the centerline of the fiber accumulation drum to not overlap, and with the centerline of the fiber accumulation drum being closer to the upstream side of the fiber accumulation drum flow direction than the centerline of the crushing device, the space of the forming cavity is larger, and more of the absorbent pulp and polymer mixture gathers at the head of the three-dimensional and flat parts of the screen, making the head of the three-dimensional and flat parts more complete and full, thereby improving the forming quality of the entire absorbent core. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is an example diagram of a disposable sanitary product prepared by an absorbent core molding system according to an embodiment of this application.
[0021] Figure 2 for Figure 1 A schematic diagram of the absorbent core of a disposable hygiene product is shown.
[0022] Figure 3 for Figure 2 A sectional view.
[0023] Figure 4 This is a schematic diagram of an embodiment of an absorbent core forming system according to this application.
[0024] Figure 5 for Figure 4 The diagram shows a front view of the molding die unit of the absorber core molding system.
[0025] Figure 6 for Figure 5 A top-down view.
[0026] Figure 7 This is a schematic diagram of the molding die unit installed on the fiber drum.
[0027] Figure 8 This is a schematic diagram of a screen in a molding unit, in which absorbent pulp and a polymer mixture forming the absorbent core are adsorbed onto the screen.
[0028] Figure 9 for Figure 8 A magnified view of the draft angle in the image.
[0029] Figure 10 This is a schematic diagram of another embodiment of an absorbent core forming system of this application. Detailed Implementation
[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to up, down, left, and right in the actual use or working state of the device, specifically the drawing directions in the accompanying drawings.
[0031] This application provides an absorbent core molding system for preparing absorbent cores. The absorbent core includes a planar portion and a three-dimensional portion. The absorbent core molding system includes at least a fiber accumulation device. The fiber accumulation device includes a molding cavity, a cylindrical fiber accumulation drum, and multiple molding die units disposed on the outer peripheral surface of the fiber accumulation drum. The outlet of the molding cavity corresponds to the molding die unit and is used to transport the material for preparing the absorbent core to the molding die unit for molding. The molding die unit includes a molding plate and a screen disposed below the molding plate. The molding plate has an opening that matches the shape of the outer contour of the absorbent core. The screen has a mesh structure. The screen includes a planar portion and a three-dimensional portion. The planar portion corresponds to the planar portion of the absorbent core, and the three-dimensional portion corresponds to the three-dimensional portion of the absorbent core. The open area ratio of the mesh in the three-dimensional portion is greater than that of the mesh in the planar portion. The three-dimensional portion has a concave structure, and the planar portion surrounds the periphery of the three-dimensional portion and forms a sidewall for transitional connection between the three-dimensional portion and the planar portion. The sidewall has a draft angle α, which is at least greater than 20°. As the draft angle increases, the corresponding orthographic projection area of the sidewall also increases, thereby increasing the amount of material fibers forming the three-dimensional portion of the absorbent core accommodated in the three-dimensional portion.
[0032] This application provides an absorbent core molding system that ensures a distinct convexity in the three-dimensional portion of the absorbent core and meets a set weight by setting different opening ratios for the planar and three-dimensional portions of the screen mesh, with the opening ratio of the three-dimensional portion mesh being greater than that of the planar portion mesh. Furthermore, the draft angle α of the sidewall formed between the planar and three-dimensional portions is at least greater than 20°. As the draft angle increases, the corresponding projected area of the sidewall also increases, making the slope corresponding to the draft angle gentler. This increases the accommodating space of the head of the three-dimensional portion (the end first filled with the absorbent pulp and polymer mixture along the running direction of the molding die). During fiber deposition, more absorbent pulp and polymer mixture is adsorbed onto the head of the three-dimensional portion of the screen mesh in the counter-winding direction, making the head of the three-dimensional portion complete and full, thereby improving the overall molding quality of the absorbent core.
[0033] In some embodiments of this application, the absorbent core forming system further includes a crushing device located upstream of and communicating with the forming cavity. The crushing device is configured to crush and de-fibril the material used to prepare the absorbent core into material fibers. Along the main flow direction, the centerline of the crushing device does not overlap with the centerline of the fiber-accumulating drum, wherein the centerline of the fiber-accumulating drum is closer to the upstream side of the fiber-accumulating drum in the flow direction than the centerline of the crushing device. This results in a larger forming cavity space, allowing more absorbent pulp and polymer mixture to accumulate at the heads of the three-dimensional and flat sections of the screen, making the heads of the three-dimensional and flat sections more complete and full, thereby improving the overall forming quality of the absorbent core.
[0034] The following will provide a detailed description of an absorbent core molding system provided in the embodiments of this application. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.
[0035] This application provides an absorbent core molding system for preparing absorbent cores for disposable hygiene products, such as... Figure 1 The absorbent core S1 of the disposable hygiene product S shown herein, wherein, Figure 1 The disposable sanitary product S shown is a feminine hygiene pad. The absorbent core S1 has a three-dimensional convex structure, which includes a flat part S11 and a three-dimensional part S12, as shown below. Figure 2 and Figure 3 As shown, the three-dimensional part S12 is located in the middle of the planar part S11 and protrudes from the planar part S11. Of course, in some cases, the three-dimensional part S12 may not be located in the middle of the planar part S11, but may be located in a position slightly forward. The specific position can be determined according to the actual situation.
[0036] One embodiment of this application provides an absorbent core molding system, such as... Figure 4 As shown, the absorbent core forming system includes a crushing device 1, a fiber accumulation device, a polymer application device 3, a conveying device 6, and a clamping device 7. The fiber accumulation device includes a forming cavity 2, a fiber accumulation drum 4, and multiple forming mold units 5 disposed on the outer peripheral surface of the fiber accumulation drum 4.
[0037] Specifically, the pulp raw material is guided and fed into the pulverizing device 1, where it is pulverized and defiberized to form absorbent pulp (i.e., fluff pulp fibers), which is then conveyed to the forming chamber 2 of the fiber accumulation device. The forming chamber 2 is located downstream of the pulverizing device 1 and is connected to it. The forming chamber 2 is a hollow cavity structure with negative pressure inside, provided by the negative pressure zone structure in the internal partition of the fiber accumulation drum 4 on the downstream side. A polymer application device 3 is provided on the side wall of the forming chamber 2. The polymer application device 3 has an output end connected to the inside of the forming chamber 2, which is used to convey superabsorbent polymer particles (abbreviated as polymer or SAP) into the forming chamber 2 and mix them with the absorbent pulp. The forming chamber 2 uses negative pressure to convey the mixture of absorbent pulp and polymer (collectively referred to as materials) to the forming die unit 5 on the downstream side for forming.
[0038] Downstream of the forming cavity 2, a fiber-accumulating drum 4 and a forming mold unit 5 are provided. The outlet of the forming cavity 2 corresponds to the forming mold unit 5, which is used to transport the material for preparing the absorbent core S1 to the forming mold unit 5 for forming. The fiber-accumulating drum 4 has a cylindrical structure, and there are multiple forming mold units 5, which are sequentially arranged on the outer circumference of the fiber-accumulating drum 4. The fiber-accumulating drum 4 is connected to a driving device (not shown in the figure), which drives the forming mold units 5 to rotate. The fiber-accumulating drum 4 has a partitioned structure, including at least a negative pressure zone (not shown in the figure). The forming cavity 2 corresponds to the negative pressure zone of the partitioned structure. The negative pressure zone is connected to a suction device (such as a negative pressure fan or vacuum generator). The fiber-accumulating drum 4 is used to pass the negative pressure air generated by the suction device through the negative pressure zone inside the fiber-accumulating drum 4, so that the mixture of absorbent pulp and polymer is adsorbed into the forming unit 5 for forming. The partitioned structure of the fiber-accumulating drum 4 also includes a positive pressure zone, a blowing zone, and a cleaning zone (not shown in the figure), which will not be described in detail here.
[0039] The molding unit 5 includes a molding module 51, a molding plate 52, and a screen 53, such as Figures 5 to 7As shown. The molding module 51 has a through stepped hole 511, and the molding plate 52 and the screen 53 are installed in the stepped hole 511. The molding plate 52 has an opening 521, the shape of which is adapted to the shape of the outer contour of the absorbent core S1. The screen 53 has a mesh structure, which is mainly used to provide a breathable environment, through which gas can pass, while the mixture of absorbent pulp and polymer is adsorbed onto the surface of the screen 53. The screen 53 has a planar portion 531 and a three-dimensional portion 532. The three-dimensional portion 532 has a recessed structure, and the planar portion 531 surrounds the periphery of the three-dimensional portion 532, forming a sidewall 533 for transitional connection between the three-dimensional portion 532 and the planar portion 531 (details of the sidewall 533 will be further explained below). The three-dimensional portion 532 corresponds to the three-dimensional portion S12 of the absorbent core S1, and the planar portion 531 corresponds to the planar portion S11 of the absorbent core S1. Figure 5 and Figure 7 As shown, the screen 53 is positioned below the forming plate 52 and is installed together within the stepped hole 511 of the forming module 51. Specifically, the stepped hole 511 includes a first hole 511a and a second hole 511b. The first hole 511a is located above the second hole 511b, and the diameter of the first hole 511a is larger than the diameter of the second hole 511b. The forming plate 52 is located within the first hole 511a of the stepped hole 511, and the three-dimensional portion 532 of the screen 53 is located within the second hole 511b of the stepped hole 511. The planar portion 531 and the three-dimensional portion 532 of the screen 53 communicate with the negative pressure zone inside the fiber accumulation drum 4, and the forming cavity 2 communicates with the screen 53. The suction device described above generates negative pressure air, which passes through the negative pressure zone inside the fiber drum 4, so that the mixture of absorbent pulp and polymer in the molding cavity 2 can be adsorbed onto the surface of the screen 53 of the molding unit 5. The negative pressure air can be distributed into the interior of the molding cavity 2 after passing through the screen 53, so that the mixture of absorbent pulp and polymer can be adsorbed onto the screen 53 for molding.
[0040] Since the amount of absorbent pulp and polymer mixture required for the three-dimensional portion 532 of the screen 53 is greater than that for the planar portion 531, in order to ensure that the three-dimensional portion S12 of the absorbent core S1 has a significant convexity and that the basis weight corresponding to the three-dimensional portion S12 meets the set value, in this application, the opening ratio of the mesh of the planar portion 531 and the three-dimensional portion 532 of the screen 53 is set differently. Specifically, the opening ratio of the mesh of the three-dimensional portion 532 is greater than that of the mesh of the planar portion 531. In this way, the opening ratio of the mesh of the three-dimensional portion 532 is set to be larger to ensure that the three-dimensional portion 532 obtains a larger air volume, thereby achieving the convex effect of the three-dimensional portion S12 and the required basis weight. Further, the opening ratio of the mesh of the three-dimensional portion 532 can be set to 1.1 to 2.5 times the opening ratio of the mesh of the planar portion 531. The aperture ratio of the mesh in the planar portion 531 is 20%-50%. Specifically, the aperture ratio of the mesh in the planar portion 531 can be, but is not limited to, 20%, 27%, 33%, 44%, 50%, or other values between 20% and 50%. The aperture ratio of the mesh in the three-dimensional portion 532 is 30%-65%. Specifically, the aperture ratio of the mesh in the three-dimensional portion 532 can be, but is not limited to, 30%, 38%, 48%, 56%, 65%, or other values between 30% and 65%. It should be noted that the opening ratio of the mesh in the planar portion 531 and the three-dimensional portion 532 can be set according to the weight requirements of the planar portion S11 and the three-dimensional portion S12 of the absorbent core S1. In other words, the opening ratio of the mesh in the three-dimensional portion 532 is determined based on the weight of the three-dimensional portion S12 of the absorbent core S1, and the opening ratio of the mesh in the planar portion 531 is determined based on the weight of the planar portion S11 of the absorbent core S1. Furthermore, the screen 53 can be woven from 30-60 mesh wire with a wire diameter of φ0.1-φ0.8. The specific specifications can be determined based on the actual weight of the absorbent core S1.
[0041] As described above, the planar portion 531 of the screen 53 surrounds the periphery of the three-dimensional portion 532, and the planar portion 531 and the three-dimensional portion 532 form a sidewall 533 for transitional connection between the three-dimensional portion 532 and the planar portion 531. This sidewall 533 has a draft angle α, such as... Figure 5 As shown. It should be noted that, because the three-dimensional portion 532 of the screen 53 is concave (i.e., recessed) compared to the planar portion 531, the sidewall 533 will have a draft angle α (i.e., located at the four corners of the three-dimensional portion 532) during the manufacturing process, such as... Figure 5As shown, the draft angle α refers to the angle between the sidewall 533 and the bottom surface of the screen 53 (here, it refers to the intersection of the extension line of the sidewall 533 and the extension line of the bottom surface of the screen 53, and the angle formed by the straight line passing through the intersection point and perpendicular to the bottom surface of the screen 53 and the sidewall 533). Normally, this draft angle α is not very large, around 20°. The inventors of this application further discovered that when the absorbent core forming system is running, for example, when the fiber accumulation drum 4 drives the forming mold unit 5 to rotate in the rotation direction A (clockwise), the mixture of absorbent pulp and polymer is deposited and formed on the screen 53 of the forming mold unit 5 in the forming cavity 2 with the negative pressure air. At the same time, there is a headwind in the opposite direction to the rotation direction A (i.e., the headwind direction B), which may affect the cotton accumulation at the head of the screen 53 (the part running in front), and cause a cotton shortage at the head of the three-dimensional part S12, making the three-dimensional part S12 potentially incomplete, such as... Figure 8 As shown. To address this situation, the inventors propose in this embodiment to set the draft angle α (i.e., located at the four corners of the three-dimensional portion 532) to be larger. When the draft angle increases, the projected area corresponding to the sidewall 533 also increases accordingly, making the inclined surface corresponding to the draft angle α more gentle, thereby increasing the accommodating space of the head of the three-dimensional portion S12, such as... Figure 9 As shown. Further, the draft angle α can preferably be set to 25° to 50°. When the draft angle α changes from α1 to α2, the accommodating area of the head of the solid portion S12 increases accordingly (e.g., Figure 9 (as shown in the cross-sectional section), in this way, during the fiber deposition process, along the counter-wind direction B, there is more space to accommodate the mixture of absorbent pulp and polymer, so that more of the mixture of absorbent pulp and polymer is adsorbed to the head of the screen 53. In this way, the head of the three-dimensional part S12 can be more complete and full, thereby improving the molding quality of the entire absorbent core S1.
[0042] It should be noted that, from a product design perspective, the larger the draft angle α, the more filler (a mixture of absorbent pulp and polymer) the three-dimensional part S12 will receive, which is beneficial to the molding effect of the three-dimensional part S12. However, during the processing and molding of the screen 53, the processing technology limits the draft angle α to a maximum of 60°. If this angle is exceeded, the sidewall 533 of the transition connecting the three-dimensional part 532 and the planar part 531 may experience tearing or other issues.
[0043] Return to reference Figure 4The downstream sheet W is conveyed to the conveying device 6. The mixture of absorbent pulp (i.e., material fibers) and polymer, formed by the molding unit 5, is demolded and conveyed above the sheet W on the conveying device 6. The sheet W can be an absorbent material such as toilet paper or absorbent paper. A clamping device 7 is provided above the rear end of the conveying device 6 in the flow direction. The clamping device 7 is used to compact the mixture of absorbent pulp and polymer on the sheet W (the mixture is in a relatively loose state during demolding) and convey it to the downstream process.
[0044] In the above embodiment, along the main flow direction, the center line of the crushing device 1 overlaps with the center line of the fiber accumulation drum 4.
[0045] In another embodiment of this application, the absorber core molding system in this other embodiment is similar to that in the above embodiment (i.e. Figure 4 Compared to the absorber core forming system in the illustrated embodiment, except in this other embodiment, the positional relationship between the centerline L1 of the crushing device 1 and the centerline L2 of the fiber accumulation drum 4 along the main flow direction is as follows: Figure 4 Apart from the different positional relationships in the illustrated embodiments, the remaining structures are basically the same. Figure 10 In another embodiment of this application shown, the center line L1 of the pulverizing device 1 and the center line L2 of the fiber accumulation drum 4 do not overlap along the main flow direction. Figure 10 As shown, the distance between the center line L1 of the pulverizing device 1 and the center line L2 of the fiber drum 4 is L. The center line L2 of the fiber drum 4 is closer to the upstream side of the fiber drum's flow direction than the center line L1 of the pulverizing device 1. In this embodiment, the main flow direction is from right to left, referring to the flow direction of the main production line of the sanitary napkin. However, the flow direction of each device may differ, such as the flow direction of the fiber drum 4 (which has a cylindrical structure and a clockwise flow direction). Figure 10 (As indicated by arrow A in the diagram) is not aligned with the main flow direction. Therefore, for the main flow direction, the centerline L2 of the fiber accumulation drum 4 is closer to the downstream side of the main flow direction than the centerline L1 of the crushing device 1. This arrangement allows for a larger space in the forming cavity 2, enabling more of the absorbent pulp and polymer mixture to accumulate at the head of the screen 53 along the counter-current direction B. This makes the heads of the three-dimensional portion S12 and the flat portion S11 of the screen 53 more complete and full, thereby further improving the forming quality of the entire absorbent core S1.
[0046] The above provides a detailed description of the absorbent core forming system provided by this utility model. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.
Claims
1. An absorbent core body forming system for producing an absorbent core body, characterized by comprising: The absorbent core body comprises a planar part and a three-dimensional part, and the absorbent core body forming system comprises at least a fiber accumulation device, which comprises a forming cavity, a cylindrical fiber accumulation drum, and a plurality of forming die units arranged on the outer peripheral surface of the fiber accumulation drum; the outlet of the forming cavity corresponds to the forming die units, and is used to deliver the material for preparing the absorbent core body into the forming die units for forming; the forming die unit comprises a forming plate and a screen arranged below the forming plate; The forming plate has an opening which is matched with the shape of the outer contour of the absorbent core body; the screen has a grid structure, and comprises a planar part and a three-dimensional part; the planar part is arranged corresponding to the planar part of the absorbent core body; the three-dimensional part is arranged corresponding to the three-dimensional part of the absorbent core body; the opening rate of the grid of the three-dimensional part is greater than that of the grid of the planar part; the three-dimensional part has a recessed structure, and the planar part surrounds the periphery of the three-dimensional part and forms a side wall for connecting the three-dimensional part and the planar part; the side wall has a draft angle α, which is at least greater than 20°; when the draft angle increases, the corresponding projection area of the side wall also increases, so that the amount of the material fibers forming the three-dimensional part of the absorbent core body contained in the three-dimensional part increases.
2. The absorbent core body forming system of claim 1, wherein, The opening rate of the grid of the three-dimensional part is 1.1-2.5 times that of the grid of the planar part.
3. The absorbent core body forming system of claim 2, wherein, The opening rate of the grid of the planar part is 20%-50%, and the opening rate of the grid of the three-dimensional part is 30%-65%.
4. The absorbent core forming system of claim 1, wherein, The value of the draft angle α of the side wall ranges from 25° to 50°.
5. The absorbent core forming system of claim 1, wherein, The forming die unit further comprises a forming module having a through stepped hole, and the forming plate and the screen are arranged in the stepped hole, wherein the screen is arranged below the forming plate.
6. The absorbent core forming system of claim 1, wherein, The inside of the fiber accumulation drum has a partition structure, and the partition structure comprises at least a negative pressure area; the forming cavity is arranged corresponding to the negative pressure area of the partition structure.
7. The absorbent core body forming system of claim 6, wherein, The planar part and the three-dimensional part of the screen are both through the negative pressure area, and the forming cavity is through the screen.
8. The absorbent core forming system of claim 1, wherein, The absorbent core body forming system further comprises a crushing device, which is arranged on the upstream side of the forming cavity and communicates with the forming cavity; the crushing device is configured to crush and defiber the material for preparing the absorbent core body into material fibers.
9. The absorbent core forming system of claim 8, wherein, Along the main flow direction, the center line of the crushing device overlaps the center line of the fiber accumulation drum.
10. The absorbent core forming system of claim 8, wherein, Along the main flow direction, the center line of the crushing device does not overlap the center line of the fiber accumulation drum, and the center line of the fiber accumulation drum is closer to the upstream side of the fiber accumulation drum than the center line of the crushing device.