Positioning absorption core baby diaper production process

Abstract

The present application relates to the field of disposable sanitary products, and provides a positioning and absorbing core baby diaper production process. A high polymer spreading device is used to discharge high polymer material onto a high polymer carrier. The discharge valve in the middle of the high polymer spreading device has a larger discharge amount, and the discharge valves on both sides have a smaller discharge amount. An absorbing core body is formed on the high polymer carrier. The high polymer material in the middle of the absorbing core body is more, and the high polymer material at the front and rear ends is less. The surface layer non-woven fabric, the flow guide layer, the absorbing core body and the liquid-impermeable bottom layer are compounded. The high polymer material at the front and rear ends of the core layer is less, and the high polymer material in the middle is more. The middle part of the absorbing core body has higher absorption performance. In this way, the absorbing core body can fully play a role, material is saved, production cost is reduced, and the technical problem of waste caused by the fact that the absorbing core body cannot be fully utilized is solved.

Description

Technical Field

[0001] This invention relates to the field of disposable hygiene products, and more particularly to a manufacturing process for a positioning absorbent core baby diaper. Background Technology

[0002] With the improvement of living standards, people are paying more and more attention to personal hygiene. As an essential hygiene product for newborns, baby diapers have attracted widespread attention from consumers for their softness, dryness, absorption speed, and other indicators. Generally, diapers are composed of materials such as a hydrophilic non-woven fabric surface layer, a diversion layer, an absorbent core, and a leak-proof bottom layer. The absorbent core of traditional diapers is often made by uniformly mixing fluff pulp and superabsorbent polymer (SAP). The traditional SAP process involves a Y-shaped discharge port below the SAP storage tank. When the polymer material falls vertically through the Y-shaped tube, the high-pressure airflow encounters the polymer at the intersection of the Y-shaped tube and disperses it, promoting uniform distribution of the polymer material in the absorbent core. Since urine is mainly concentrated in the first 1 / 4 to 2 / 3 of the absorbent core during use, some of the cotton core cannot be fully utilized, resulting in waste.

[0003] The absorbent core in diapers is a key component affecting product performance. Its performance is directly reflected in the product's dryness, absorption speed, and other properties. It is also an important part of the product cost. High-performance products often have a higher price because they use more superabsorbent resin in the absorbent core, while more economical products cannot meet consumers' high demands for product performance. Therefore, it is particularly important to develop a cost-effective and high-performance baby diaper. Summary of the Invention

[0004] Therefore, to address the aforementioned problems, this invention proposes a manufacturing process for baby diapers with a positioning absorbent core. This process solves the technical problem of waste caused by the incomplete utilization of the absorbent core.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A manufacturing process for baby diapers with a positioning absorbent core includes the following methods:

[0007] (1) Manufacturing the absorbent core: The polymer spreading device feeds polymer material onto the polymer carrier. The feeding valve in the middle of the polymer spreading device has a larger feeding amount, while the feeding valves on both sides have a smaller feeding amount, forming an absorbent core on the polymer carrier. The absorbent core has more polymer material in the middle and less polymer material at the front and rear ends.

[0008] The polymer spreading device includes a housing and multiple discharge valves connected to the housing;

[0009] (2) Composite: The surface non-woven fabric, the flow guiding layer, the absorbent core and the liquid-impermeable bottom layer are composited by a composite roller;

[0010] (3) Cutting: The product is cut into slices by a cutting roller device.

[0011] Further:

[0012] In method (1), during the formation of the absorbent core, the baffle part of the baffle device extends above the polymer carrier. The baffle part runs synchronously with the absorbent core. After the absorbent core is formed, the baffle part is located inside the absorbent core. The baffle part is pulled out by the telescopic mechanism to form at least one buffer groove inside the absorbent core.

[0013] The material blocking device includes a conveying mechanism and at least one material blocking part disposed on the conveying mechanism, the material blocking part being retractably disposed on the conveying mechanism.

[0014] The conveying mechanism is provided with multiple mounting seats, and each mounting seat is provided with at least one sleeve rod. An insert rod is inserted into the sleeve rod and connected to a movable seat. At least one of the material blocking parts is provided on the movable seat. A buffer spring is provided between the mounting seat and the movable seat. The material blocking device also includes a telescopic mechanism, a roller seat provided on the telescopic mechanism, and at least one roller body rotatably provided on the roller seat.

[0015] When the material stop moves to the end of the conveying mechanism, the telescopic mechanism is activated, the roller abuts against the moving seat, and the moving seat compresses and moves, causing the material stop to disengage from the absorption core. After the moving seat disengages from the roller, the moving seat resets due to the action of the buffer spring, and the roller resets to start the next round of action.

[0016] The telescopic mechanism is movably configured. The frame is equipped with a slide rail, a slider that can slide on the slide rail, and a drive mechanism that drives the slider to move. The telescopic mechanism is located on the slider, and the roller can move one end distance synchronously with the moving seat.

[0017] A buffer sleeve is fitted onto the roller body, and a buffer pad is provided on the movable seat, allowing the roller body to abut against the buffer pad.

[0018] The conveying mechanism is a conveyor belt mechanism, which is vertically arranged.

[0019] The buffer slot includes at least one first buffer slot, and the absorbent core has an upwardly protruding first absorbent layer in the middle. The first buffer slot is located in the first absorbent layer and penetrates through the first absorbent layer.

[0020] The buffer groove includes at least one second buffer groove. The absorbent core includes a second absorbent layer and a first absorbent layer that protrudes upward in the middle of the second absorbent layer. The second buffer groove is located in the second absorbent layer. After the buffer groove is formed, one or both ends of the absorbent core are hot-pressed by a hot-pressing roller to make the second buffer groove a sealed structure.

[0021] The feeding valve includes a superabsorbent resin feeding valve and a diffusion fiber feeding valve. The diffusion fiber feeding valve is set on both sides along the conveying direction. The polymer material at the front and rear ends of the absorbent core is superabsorbent resin. The superabsorbent resin feeding valve and the diffusion fiber feeding valve are set in the middle. The polymer material formed in the middle of the absorbent core is a mixture of superabsorbent resin and diffusion fiber.

[0022] The absorber core maintains a lower polymer content in the first quarter and last third along its length, while the middle part of the absorber core, located in the first quarter to second third, maintains a higher polymer content.

[0023] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0024] This invention uses a polymer spreading device to spread polymer materials through a feeding valve. By controlling the amount of material fed through the valve, less polymer material is used at the front and rear ends of the absorbent core, while more is used in the middle. This results in higher absorbency in the middle section of the absorbent core, allowing it to function optimally, saving materials, and reducing production costs. Furthermore, the thinner front and rear sections of the absorbent core improve breathability in the crotch and buttock areas, and the smaller core mass makes the entire diaper lighter and smaller, improving product quality. Moreover, traditional methods of adding buffer grooves inside the absorbent core to increase the flow rate, penetration rate, and absorption rate of liquid within the core typically require double or multi-layer composites. The production of absorbent cores is more complex and costly. When combining double or multiple layers of absorbent cores, variations in tension between different layers can occur. After cutting, the absorbent core recovers its length, and these uneven tensions can lead to significant dimensional deviations, affecting product quality. Furthermore, absorbent cores are typically bonded with adhesive, which can delaminate upon contact with water and impair liquid permeability, greatly impacting performance. The resulting composite absorbent core is also thicker. Typically, buffer grooves are formed using a cutting roller, resulting in waste and increased production costs. This invention, however, employs a material-blocking device to create buffer grooves within the absorbent core, thus... The entire absorbent core is integrally molded, resulting in a thinner and lighter design, simpler manufacturing process, no need for cutting, material savings, and improved absorption performance. Furthermore, the use of rollers to move the movable seat allows the baffle to detach from the absorbent core, reducing friction on the rollers. The movable roller design further reduces friction between the roller and the movable seat and facilitates the detachment of the baffle from the absorbent core. Additionally, the buffer sleeve and buffer pad provide cushioning to prevent excessive collisions or friction between the roller and the movable seat. Finally, the first buffer groove is located on the protrusion, facilitating the diffusion of liquid within the protrusion along the first buffer groove to both ends, improving the absorption rate at both ends and increasing the diffusion speed of the liquid within the absorbent core. The diffusion rate and absorption rate are improved. Furthermore, the second buffer tank is located at the bottom, increasing the diffusion rate, infiltration rate, and absorption rate of the absorbent core. Additionally, the diffusion fiber feeding valve dispenses diffusion fibers, resulting in rapid liquid dispersion. The superabsorbent resin feeding valve dispenses superabsorbent resin, which has excellent water absorption properties. The polymer materials at both ends of the absorbent core are superabsorbent resins, ensuring good water absorption at the front and rear ends and relatively poor diffusion performance, thus preventing liquid leakage from the absorbent core. Furthermore, since the first 1 / 4 and last 1 / 3 of the absorbent core typically absorb less liquid along its length, a lower polymer content is maintained at these two locations, improving the utilization rate of the absorbent core's polymers. Attached Figure Description

[0025] Figure 1 This is a simplified structural diagram of the present invention;

[0026] Figure 2 This is a schematic diagram of the absorber core structure;

[0027] Figure 3 This is a cross-sectional view of the absorber core;

[0028] Figure 4 This is a simplified structural diagram of the material blocking device;

[0029] Figure 5 yes Figure 4 A schematic diagram of the structure of the middle baffle device in another state;

[0030] Figure 6 This is a structural schematic diagram of the material blocking device from another angle;

[0031] Figure 7 This is a schematic diagram of the non-movable telescopic mechanism of the material blocking device;

[0032] Figure 8 This is a simplified structural diagram of a polymer dispensing device;

[0033] Figure 9 This is a diagram showing the distribution of the feed valves;

[0034] Figure 10 This is a schematic diagram of the absorption core having a third buffer slot;

[0035] Figure 11 It is formed Figure 10 A schematic diagram of the material-blocking section of the absorber core. Detailed Implementation

[0036] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0037] refer to Figures 1 to 11 This embodiment provides a manufacturing process for baby diapers with a positioning absorbent core, including the following methods:

[0038] (1) Manufacturing the absorbent core 11: The polymer spreading device 2 feeds polymer material onto the polymer carrier 15. The feeding valve in the middle of the polymer spreading device 2 has a larger feeding volume, while the feeding valves on both sides have a smaller feeding volume. The blocking part 32 of the blocking device 3 extends above the polymer carrier 15. The blocking part 32 operates synchronously with the absorbent core 11. When the blocking part 32 moves to the end of the conveying mechanism 31, the telescopic mechanism 38 is activated, and the roller 391 abuts against the moving seat 36. The moving seat 36 moves, causing the blocking part 32 to detach from the absorbent core 11. Figure 5The drive mechanism 303 drives the roller 391 and the moving seat 36 to move synchronously by one distance. After the moving seat 36 disengages from the roller 391, the moving seat 36 resets due to the action of the buffer spring 37, and the roller 391 resets to perform the next round of action. After the absorbent core 11 is formed, the baffle part 32 is located inside the absorbent core 11. The baffle part 32 is pulled out by the telescopic mechanism 38 to form at least one buffer groove inside the absorbent core 11. The feeding valve includes a superabsorbent resin feeding valve 21 and a diffusion fiber feeding valve 22. The diffusion fiber feeding valve 22 is set on both sides along the conveying direction. The polymer material at the front and rear ends of the absorbent core 11 is superabsorbent resin. The superabsorbent resin feeding valve 21 and the diffusion fiber feeding valve 22 are set in the middle. The polymer material formed in the middle of the absorbent core 11 is a mixture of superabsorbent resin and diffusion fiber. There is more polymer material in the middle of the absorbent core 11 and less polymer material at the front and rear ends.

[0039] The polymer spreading device 2 includes a box and multiple feeding valves connected to the box. The feeding valves include a superabsorbent resin feeding valve 21 and a diffusion fiber feeding valve 22.

[0040] The material blocking device 3 includes a conveying mechanism 31 and at least one material blocking part 32 disposed on the conveying mechanism 31. The material blocking part 32 is retractably disposed on the conveying mechanism 31. The conveying mechanism 31 is a conveyor belt mechanism and is vertically arranged.

[0041] The conveying mechanism 31 is provided with multiple mounting seats 33, and each mounting seat 33 is provided with at least one sleeve rod 34. An insert rod 35 is inserted into the sleeve rod 34 and connected to a movable seat 36. At least one stop part 32 is provided on the movable seat 36. A buffer spring 37 is provided between the mounting seat 33 and the movable seat 36. The stop device 3 also includes a telescopic mechanism 38, a roller seat 39 provided on the telescopic mechanism 38, and at least one roller body 391 rotatably provided on the roller seat 39. The telescopic mechanism 38 is movably provided. The frame is provided with a slide rail 301, a slider 302 that can slide on the slide rail 301, and a drive mechanism 303 that drives the slider 302 to move. The telescopic mechanism 38 is provided on the slide rail 301.

[0042] A buffer sleeve is fitted on the roller body 391, and a buffer pad 361 is provided on the movable seat 36, so that the roller body 391 can abut against the buffer pad 361.

[0043] (2) Composite: The surface non-woven fabric 12, the flow guiding layer 13, the absorbent core 11 and the liquid-impermeable bottom layer 14 are composited by a composite roller 4;

[0044] (3) Cutting: The product is cut into slices by the cutting roller device 5.

[0045] The buffer slot includes at least one first buffer slot 113. The absorber core 11 has an upwardly protruding first absorber layer 111 in the middle. The first buffer slot 113 is located in the first absorber layer 111 and penetrates the first absorber layer 111.

[0046] The buffer groove includes at least one second buffer groove 114. The absorbent core 11 includes a second absorbent layer 112 and a first absorbent layer 111 that protrudes upward in the middle of the second absorbent layer 112. The second buffer groove 114 is located in the second absorbent layer 112. After the buffer groove is formed, one or both ends of the absorbent core 11 are hot-pressed by the hot pressure roller 6 so that the second buffer groove 114 is a sealed structure.

[0047] The first cache slot 113 mentioned above can also be omitted, and only the second cache slot 114 can be set, depending on the specific situation.

[0048] The second cache slot 114 mentioned above can also be omitted, and only the first cache slot 113 can be set, depending on the specific situation.

[0049] The polymer carrier 15 mentioned above can be pulp or other materials, which are well-known materials and will not be described in detail here.

[0050] The aforementioned conveying mechanism 31 can also be a chain conveyor mechanism 31 or other conveying devices, which are well-known devices and will not be described in detail here.

[0051] The aforementioned baffle 32 can also be moved by a telescopic cylinder. The telescopic cylinder is mounted on the conveying mechanism 31. However, with this structure, it is not easy to connect the telescopic cylinder to electricity. It can be powered by a battery, or by contactless power supply, or by other means, depending on the specific situation.

[0052] The aforementioned buffer sleeve and buffer pad 361 can be made of rubber, silicone or other buffer materials, which are well-known components and will not be described in detail here.

[0053] The absorbent core 11 maintains a low polymer content in the first 1 / 4 and the last 1 / 3 along its length, and a high polymer content in the middle part of the absorbent core 11 located in the 1 / 4-2 / 3 range. The length for maintaining a low polymer content can also be set to other values, depending on the specific circumstances.

[0054] The aforementioned polymer spreading device 2 has a superabsorbent resin chamber 23 and a diffusion fiber chamber 24 inside its housing. The superabsorbent resin chamber 23 is connected to multiple superabsorbent resin feeding valves 21, and the diffusion fiber chamber 24 is connected to multiple diffusion fiber feeding valves 22. Each feeding valve can be equipped with a pulse sensor to control the feeding amount. The pulse sensor is a known component and will not be described in detail here.

[0055] The aforementioned telescopic mechanism 38 and drive mechanism 303 can be cylinders, linear motors or other linear motion mechanisms, which are known devices and will not be described in detail here.

[0056] The aforementioned telescopic mechanism 38 can also be configured to be non-movable, such as... Figure 7 This structure is relatively simple, but the friction between the roller 391 and the moving seat 36 is relatively large, and the specific settings should be adjusted according to the situation.

[0057] The composite roller 4, the cutter roller device 5, and the hot press roller 6 mentioned above are known devices and will not be described in detail here.

[0058] The aforementioned baffle device 3 may also be omitted, and the absorbent core 11 may not have a buffer groove. The diffusion rate, seepage rate and absorption rate of the absorbent core 11 with this structure are relatively poor. The specific configuration should be determined according to the situation.

[0059] This invention can employ a PLC or other automatic control system, which are well-known technologies and will not be described in detail here.

[0060] The top of the aforementioned absorbent core 11 can form two inclined surfaces, namely, two inclined surfaces are set at the top of the front 1 / 4 and rear 1 / 3 along the length direction. The inclined surfaces are inclined along the length direction and are inclined downward at the front and rear ends respectively. This can be achieved by controlling the feeding amount of multiple feeding valves. The liquid absorption capacity of the absorbent core 11 gradually decreases along the front and rear ends, thereby improving the utilization rate of the absorbent core 11.

[0061] The top of the aforementioned absorbent core 11 can also be set as a planar shape. The relatively inclined structure has poor utilization. It can also be set as other structures, depending on the specific situation.

[0062] The buffer tank includes at least one third buffer tank 115, which is inclined, arc-shaped, or V-shaped. The baffle portion 32 forming the third buffer tank 115 is mounted on the same movable seat 36 as the baffle portion 32 forming the first buffer tank 113. The baffle portion 32 forming the third buffer tank 115 is made of a soft material and is inclined, arc-shaped, or V-shaped, allowing it to recover its shape after deformation. Arc-shaped and V-shaped buffer tanks have downward-facing openings, which facilitates the diffusion of liquid from the middle to both ends, improving the absorption rate at both ends of the absorption core 11. (Reference) Figure 10 and Figure 11 , Figure 10 The absorption core 11 has a V-shaped third buffer slot 115. Figure 11 The material stop 32 has a V-shaped shape.

[0063] The retaining part 32 forming the third buffer slot 115 can be made of rubber, silicone or other soft materials, or it can be a hollow structure with better elasticity. These are well-known materials and will not be described in detail here.

[0064] The retaining part 32 forming the first buffer slot 113 and the second buffer slot 114 can be made of aluminum, plastic or other rigid materials, or rubber, silicone or other soft materials. These are known materials and will not be described in detail here.

[0065] refer to Figure 9 The feed valve at the front end, located in the middle, is only equipped with a superabsorbent resin feed valve 21. The bottom layer of polymer material in the middle of the absorbent core 11 is also a superabsorbent resin material. The amount of diffusion fiber fed by the diffusion fiber feed valves 22 located in the middle and rear ends increases along the conveying direction, resulting in a gradual increase in the amount of diffusion fiber in the middle of the absorbent core 11 from the top. With this structure, the diffusion and infiltration performance of the absorbent core 11 is better closer to the top, and the absorption performance is better closer to the bottom, which improves the diffusion and absorption speed of the liquid and increases the utilization rate of the absorbent core 11.

[0066] The material blocking device 3 can be equipped with a liquid spraying device to spray liquid onto the material blocking part 32. This liquid helps the material blocking part 32 to detach from the absorber core 11. This is a well-known structure and will not be described in detail here.

[0067] The aforementioned baffle 32 can be cylindrical, cuboid, triangular prism or other shapes. The structure of the buffer groove formed is the same as that of the baffle 32: it gradually increases in size along the demolding direction and the degree of change is small, which is conducive to demolding. The specific design depends on the situation.

[0068] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A process for positioning an absorbent core in a baby diaper pant comprising: The method comprises the following steps: (1) manufacturing the absorbent core: a polymer spreading device feeds polymer material onto a polymer carrier, the middle feeding valve of the polymer spreading device has a larger feeding amount, and the feeding valves on both sides have a smaller feeding amount, thereby forming the absorbent core on the polymer carrier, the middle part of the absorbent core has more polymer material, and the front and rear ends of the absorbent core have less polymer material; during the formation of the absorbent core, the blocking part of the blocking device extends above the polymer carrier, the blocking part moves synchronously with the absorbent core, after the formation of the absorbent core, the blocking part is located in the absorbent core, the blocking part is pulled out through the telescopic mechanism, and at least one buffer groove is formed in the absorbent core; The blocking device comprises a conveying mechanism and at least one blocking part arranged on the conveying mechanism, the blocking part is telescopically arranged on the conveying mechanism; a plurality of mounting seats are arranged on the conveying mechanism, at least one sleeve rod is arranged on the mounting seat, a plug rod is inserted into the sleeve rod, the plug rod is connected to a moving seat, at least one blocking part is arranged on the moving seat, a buffer spring is arranged between the mounting seat and the moving seat, the blocking device further comprises a telescopic mechanism, a roller seat arranged on the telescopic mechanism, and at least one roller body rotatably arranged on the roller seat; When the blocking part moves to the end of the conveying mechanism, the telescopic mechanism operates, the roller body abuts against the moving seat, the moving seat is compressed to make the blocking part separate from the absorbent core, after the moving seat separates from the roller body, the moving seat is reset due to the action of the buffer spring, and the roller body is reset for the next operation; The telescopic mechanism is movably arranged, a slide rail is arranged on the rack, a sliding block is slidably arranged on the slide rail, a driving mechanism is arranged to drive the sliding block to move, the telescopic mechanism is arranged on the sliding block, and the roller body can synchronously move with the moving seat by a certain distance; The polymer spreading device comprises a box body and a plurality of feeding valves connected to the box body; the feeding valves comprise superabsorbent resin feeding valves and diffusion fiber feeding valves, the diffusion fiber feeding valves are arranged on both sides along the conveying direction, and the polymer material at the front and rear ends of the absorbent core is superabsorbent resin; the superabsorbent resin feeding valves and the diffusion fiber feeding valves are arranged in the middle, and the polymer material formed in the middle of the absorbent core is a mixture of superabsorbent resin and diffusion fiber; (2) compounding: the surface non-woven fabric, the flow guide layer, the absorbent core and the liquid-impermeable bottom layer are compounded by a compounding roller; (3) cutting: the product is cut into a sheet shape by a cutter roller device.

2. The process for positioning the absorbent core of baby diapers according to claim 1, characterized in that: A buffer sleeve is sleeved on the roller body, a buffer pad is arranged on the moving seat, and the roller body can abut against the buffer pad.

3. The process for positioning the absorbent core of baby diapers according to claim 1, characterized in that: The conveying mechanism is a conveying belt mechanism, and the conveying belt mechanism is vertically arranged.

4. The process for positioning the absorbent core of baby diapers according to claim 1, characterized in that: The buffer groove comprises at least one first buffer groove, the middle part of the absorbent core has a first absorption layer protruding upward, the first buffer groove is located in the first absorption layer, and the first buffer groove penetrates through the first absorption layer.

5. The process for positioning the absorbent core of baby diapers according to claim 1, characterized in that: The buffer groove comprises at least one second buffer groove, the absorbent core comprises a second absorption layer and a first absorption layer protruding upward in the middle part of the second absorption layer, the second buffer groove is located in the second absorption layer, and after the buffer groove is formed, one end or both ends of the absorbent core are hot-pressed by a hot-pressing roller, so that the second buffer groove has a closed structure.

6. The process for positioning the absorbent core of baby diapers according to claim 1, characterized in that: The absorbent core has a lower polymer content in the front 1 / 4 and the rear 3 / 4 of the length direction, and a higher polymer content in the middle 1 / 4-2 / 3 of the length direction. The absorbent core has a lower polymer content in the front 1 / 4 and the rear 3 / 4 of the length direction, and a higher polymer content in the middle 1 / 4-2 / 3 of the length direction.

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