Paper diaper core body premixed with SAP hot air layer fibers

Abstract

The utility model is applicable to the technical field of paper diaper core bodies, and provides a paper diaper core body premixed with SAP hot air layer fibers, which comprises a core body assembly, a coating layer used for preventing urine leakage is arranged on the outer layer of the core body assembly, the coating layer is C-shaped, a C-shaped opening of the coating layer downwards wraps the core body assembly, and the core body assembly is provided with an opening. The core body assembly and the coating layer are connected in a hot pressing mode, the core body assembly comprises an absorption layer used for absorbing urine and a core body lower layer used for conducting the urine, the absorption layer is subjected to hot air reinforcement forming through hot air layer composite fibers, multiple sets of grooves used for guiding and absorbing the urine are formed in the hot air layer composite fibers, and the core body lower layer is a core body lower layer. The hot air layer composite fibers in the absorbing layer are made of polypropylene fibers and SAP, the SAP is evenly distributed in grooves, the grooves are arranged to be spiral, more efficient urine guiding and absorbing are achieved by means of changes of the density of the grooves, and the problems of urine guiding and absorbing are effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of diaper core technology, and more specifically, to a diaper core made of premixed SAP hot air layer fiber. Background Technology

[0002] As a commonly used hygiene product for infants and incontinents, the performance of diapers directly affects the comfort and health of users. Disposable diapers can keep people dry for a long time, reduce the number of changes, and allow infants and incontinents to sleep undisturbed, thus providing a comfortable sleeping environment for them.

[0003] Currently, the diaper core is usually located in the middle layer of the diaper, between the top layer and the bottom layer. The diaper core can absorb water, ensuring that urine can be absorbed, reducing the time that urine is in contact with the baby's skin, and reducing the probability of skin problems such as diaper rash.

[0004] However, existing diaper core technologies have certain shortcomings. The fiber structure of traditional diaper cores is relatively simple, and the effect of urine diversion and absorption is not ideal. The lack of special design on the fiber surface leads to poor urine flow, which can easily cause local accumulation and reduce absorption efficiency. This paper proposes a diaper core with premixed SAP hot air layer fibers to improve the existing problems. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a diaper core with premixed SAP hot air layer fiber.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A diaper core made of premixed SAP hot air layer fibers includes the core assembly, the outer layer of which is provided with a covering layer for preventing urine leakage.

[0008] The core assembly is formed by hot air reinforcement of hot air layer composite fiber. The hot air layer composite fiber is provided with multiple sets of grooves for urine guidance and absorption. The grooves are spiral in shape and are formed by spinning process.

[0009] By adopting the above technical solution and setting the core component as the absorbent layer, a highly efficient synergistic effect is achieved through a specific connection principle. This results in improved absorbency; lower surface moisture compared to traditional cores; and improved structural stability, avoiding the problems of absorbent material clumping and core breakage. The spiral gradient grooves on the hot-air layer composite fibers of the absorbent layer, with their gradually changing density from one end to the other, effectively solve the problem of urine guidance and absorption. At the front end of the diaper, the groove density is reduced, allowing urine to flow more smoothly to the back end and preventing premature saturation. Conversely, the groove density is increased at the back end, significantly enhancing its absorbency and ensuring that urine is concentrated in the more absorbent area. This meticulous design fully considers human physiological characteristics and the patterns of urine production, allowing for precise optimization according to the needs of different areas. The variation in groove density achieves more efficient urine guidance and absorption. This not only successfully prevents diapers from becoming bulky due to excessive fibers, effectively ensuring user comfort and freedom of movement, but also significantly reduces production costs.

[0010] The present invention is further configured such that: the shape of the covering layer is C-shaped, the C-shaped opening of the covering layer wraps the core component downward, and the core component and the covering layer are connected by a hot pressing method.

[0011] The present invention is further configured such that: the lower core layer is disposed at the bottom of the absorbent layer, and the lower core layer and the absorbent layer are connected by hot melt adhesive.

[0012] The present invention is further configured such that: the composite fiber of the hot air layer in the absorption layer is made of polypropylene fiber and SAP, and the polypropylene fiber and SAP are premixed through a premixing process.

[0013] The present invention is further configured such that: the SAP is selected as cross-linked sodium polyacrylate SAP, and the average particle size of the cross-linked sodium polyacrylate SAP is 10-50 micrometers.

[0014] The present invention is further configured such that: the depth of the groove is between 0.05mm and 0.15mm, the width of the groove is between 0.1mm and 0.3mm, and the spacing between two adjacent sets of the groove is between 0.2mm and 0.5mm.

[0015] By adopting the above technical solution, the preparation process using premixed SAP fibers and designed spiral grooves specifically includes: adding dispersants to the premixing process to improve mixing uniformity, forming hot air layer composite fibers and grooves through a special spinning process, and appropriate hot air treatment. This method not only ensures the quality of the hot air layer composite fibers and the stability of the groove structure, but also improves the bulkiness and softness of the core. At the same time, the fiber raw material is selected as polypropylene fiber, which, combined with the pretreatment and optimized ratio of SAP, achieves complementary material properties. The carefully designed spiral grooves provide an ideal space for urine diversion and SAP containment.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] 1. Through the gradient grooves set on the composite fibers of the hot air layer of the absorbent layer, the spiral grooves guide urine to flow quickly into the fiber interior. The premixed SAP is quickly absorbed, and the SAP is tightly bound to the polypropylene fiber, reducing migration and improving absorption efficiency and capacity. Urine is evenly distributed, and the grooves increase the contact area between the fiber and the air, accelerating moisture evaporation and keeping the diaper dry.

[0018] 2. By setting up a preparation process with premixed SAP fibers and designed spiral grooves, a dispersant is added in the premixing process to improve the mixing uniformity, a special spinning process is used to form fibers and grooves, and appropriate hot air treatment is applied. This method not only ensures the quality of the fibers and the stability of the groove structure, but also improves the fluffiness and softness of the core. At the same time, compared with the simple surface mixing of SAP in general absorbent cores, the above process embeds SAP in the spiral grooves of the fibers, which improves the utilization rate of SAP and increases the absorption effect.

[0019] 3. Through a specific connection principle, a highly efficient synergistic effect is achieved, resulting in improved absorbency; lower surface moisture in the diaper compared to traditional cores; and improved structural stability by avoiding SAP agglomeration and core breakage / clumping issues. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a diaper core made of premixed SAP hot air layer fiber according to the present invention.

[0021] Figure 2 This is a schematic diagram of the composite fiber structure of the hot air layer in the absorption layer of this utility model.

[0022] Figure 3 This is a flowchart illustrating the manufacturing process of the present invention, which involves premixing SAP fibers and designing spiral grooves.

[0023] Figure 4 This is a schematic diagram of the spinning assembly structure in this utility model.

[0024] Explanation of reference numerals in the attached diagram: 1. Core assembly; 11. Absorbing layer; 12. Lower core layer; 111. Trench;

[0025] 2. Coating layer;

[0026] 3. Screw extruder; 4. Spinning assembly; 41. Spinning plate; 42. First feed inlet; 43. Second feed inlet; 44. Spinneret; 5. Duct; 6. Winding mechanism; 7. Blowing equipment. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0029] Example 1, please refer to Figure 1-4 The present invention provides the following technical solution:

[0030] See Figure 1 A diaper core made of premixed SAP hot air layer fiber includes a core assembly 1. The outer layer of the core assembly 1 is provided with a cover layer 2 for preventing urine leakage. The cover layer 2 is C-shaped, with the C-shaped opening of the cover layer 2 wrapping the core assembly 1 downward. The core assembly 1 and the cover layer 2 are connected by heat pressing. The cover layer 2 is made of a breathable, soft and waterproof material. The heat pressing or gluing parameters are adjusted according to the characteristics of the selected cover layer 2 material to ensure that the core assembly 1 and the cover layer 2 are tightly fitted to prevent urine side leakage and seepage.

[0031] See Figure 1 The core assembly 1 includes an absorbent layer 11 for absorbing urine and a lower core layer 12 for conducting urine. The lower core layer 12 is disposed at the bottom of the absorbent layer 11 and is attached to the absorbent layer 11. The lower core layer 12 and the absorbent layer 11 are connected by hot melt adhesive. An environmentally friendly adhesive is used when bonding the lower core layer 12 and the absorbent layer 11 to ensure the tightness and stability of the connection between the lower core layer 12 and the absorbent layer 11, so as to realize the smooth conduction of urine.

[0032] See Figure 2The absorbent layer 11 is formed by hot-air reinforcement of hot-air composite fibers. Multiple sets of grooves 111 for urine guidance and absorption are provided on the hot-air composite fibers. The grooves 111 are spiral in shape and are formed by spinning process. The depth of the grooves 111 is between 0.05mm and 0.15mm, the width of the grooves 111 is between 0.1mm and 0.3mm, and the spacing between two sets of grooves 111 is between 0.2mm and 0.5mm, providing ideal space for urine guidance and SAP (superabsorbent polymer) containment. Through the gradient grooves 111 provided on the hot-air composite fibers of the absorbent layer 11, the density of the grooves 111 gradually changes from one end to the other. By utilizing the change in the density of the grooves 111, more efficient urine guidance and absorption are achieved. This not only successfully avoids the diaper from becoming bulky due to excessive fibers, effectively ensuring the user's comfort and freedom of movement, but also significantly reduces production costs.

[0033] See Figure 1 and Figure 2 The composite fiber of the hot air layer in the absorbent layer 11 is made of polypropylene fiber and SAP. The polypropylene fiber and SAP are premixed through a premixing process. Polypropylene fiber has a high melting point and is structurally stable in the subsequent hot air process. Polypropylene fiber is lightweight and has good hydrophobicity, which is conducive to urine drainage. The SAP is cross-linked sodium polyacrylate SAP. The average particle size of cross-linked sodium polyacrylate SAP is 10-50 micrometers. Cross-linked sodium polyacrylate SAP has the characteristics of high water absorption and rapid absorption, and can quickly absorb urine.

[0034] See Figure 3 and Figure 4 The specific forming process and method of groove 111 are as follows:

[0035] First, SAP and polypropylene fiber raw materials are premixed using a premixing process. The premixing process uses mechanical stirring. Before mixing, SAP is micronized and surface modified, and hydrophilic functional groups or coatings are added to improve its compatibility with polypropylene fiber raw materials. During stirring, a small amount of nonionic surfactant is added as a dispersant, with an addition amount of 0.1%-0.5% of the total mass, to ensure uniform dispersion of SAP.

[0036] Secondly, the premixed SAP and fiber raw materials are fed into the screw extruder 3, where they are melted and compressed to ensure that the melt has a certain pressure and uniformity.

[0037] Then, the melt is extruded through the spinning assembly 4, which includes a spinning plate 41, a first feed port 42, a second feed port 43, and a spinneret 44. The melt enters the spinning plate 41 through the first feed port 42, and the SAP raw material enters through the second feed port 43. The diameter of the second feed port 43 is usually between 0.5 and 2 mm, and its shape can be circular, square, or rectangular. The angle should take into account the flow characteristics of SAP and the mixing effect with the melt. Generally, it forms an angle of 30° to 60° with the plane of the spinning plate 41. Increasing the SAP feed port ensures that when the hot air layer composite fiber is prepared, SAP is embedded in the spiral grooves 111 of the hot air layer composite fiber, rather than SAP simply mixed on the surface of the polypropylene fiber.

[0038] Then, after the SAP and melt enter the spinning plate 41, they are extruded through the spinneret 44 with a special shape to form a fine melt stream. The height of the protrusions or depressions in the spinneret 44 can be between 0.05-0.150 mm, and the width can be between 0.1-0.3 mm, to correspond to the spinning equipment with the required groove 111 size. In addition, the groove 111 is adjusted according to the fiber diameter and the flow rate to increase the urine flow path and the opportunity to contact SAP. During special processing, the spinning speed is controlled at 1000-3000 m / min and the draw ratio is 1.5-3 times to ensure the quality of the composite fiber in the hot air layer and the stability of the groove 111 structure.

[0039] Finally, the composite fiber, after passing through the spinneret, enters the interior of the channel 5. The channel 5 is equipped with multiple air blowing nozzles, evenly distributed above and below the fiber. The air blowing device 7 is activated, and the fiber is cooled by side blowing or ring blowing, so that the fiber can be rapidly solidified under uniform cooling conditions to form a nascent fiber with certain physical properties and spiral grooves 111 embedded with SAP morphological structure. After the nascent fiber is stretched and oriented, it is wound by the winding mechanism 6 to complete the preparation of fiber with grooves 111 and premixed with SAP. The fiber mixed with SAP and designed with spiral grooves 111 is prepared into hot air nonwoven fabric as the core fluffy hot air layer through hot air reinforcement process.

[0040] The preparation process using premixed SAP fibers and designed spiral grooves 111 specifically includes: adding dispersants to the premixing process to improve the mixing uniformity, forming fibers and grooves 111 through a special spinning process, and appropriate hot air treatment. This preparation method not only ensures the quality of the hot air layer composite fiber and the stability of the groove 111 structure, but also improves the fluffiness and softness of the core.

[0041] Compared to the simple surface mixing of SAP in general absorbent cores, the above process embeds SAP in the spiral grooves 111 of the composite fiber in the hot air layer, which improves the utilization rate of SAP and increases the absorption effect.

[0042] Specifically, the spiral grooves 111 guide urine to flow quickly into the fiber interior, where the premixed SAP is rapidly absorbed. The SAP is tightly bonded to the composite fiber of the hot air layer, reducing migration and improving absorption efficiency and capacity. Urine is evenly distributed, and the grooves 111 increase the fiber's contact area with air, accelerating moisture evaporation and keeping the diaper dry.

[0043] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

Claims

1. A diaper core made of premixed SAP hot air layer fibers, characterized in that: Includes a core assembly (1), the outer layer of which is provided with a covering layer (2) for preventing urine leakage; The core assembly (1) includes an absorbent layer (11) for absorbing urine and a core lower layer (12) for conducting urine. The absorbent layer (11) is formed by hot air reinforcement of hot air composite fiber. The hot air composite fiber is provided with multiple sets of grooves (111) for urine guidance and absorption. The grooves (111) are spiral in shape and are formed by spinning process.

2. The diaper core of a premixed SAP hot air layer fiber according to claim 1, characterized in that: The shape of the covering layer (2) is C-shaped, and the C-shaped opening of the covering layer (2) wraps the core assembly (1) downward. The core assembly (1) and the covering layer (2) are connected by hot pressing.

3. The diaper core of a premixed SAP hot air layer fiber according to claim 1, characterized in that: The lower core layer (12) is disposed at the bottom of the absorbent layer (11), and the lower core layer (12) and the absorbent layer (11) are connected by hot melt adhesive.

4. The diaper core of a premixed SAP hot air layer fiber according to claim 1, characterized in that: The hot air layer composite fiber in the absorption layer (11) is made of polypropylene fiber and SAP, and the polypropylene fiber and SAP are premixed through a premixing process.

5. The diaper core of a premixed SAP hot air layer fiber according to claim 4, characterized in that: The SAP is a cross-linked sodium polyacrylate SAP, and the average particle size of the cross-linked sodium polyacrylate SAP is between 10 and 50 micrometers.

6. The diaper core of a premixed SAP hot air layer fiber according to claim 1, characterized in that: The depth of the groove (111) is between 0.05mm and 0.15mm, the width of the groove (111) is between 0.1mm and 0.3mm, and the distance between two adjacent sets of the groove (111) is between 0.2mm and 0.5mm.

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