Methods for preparing baby diapers and baby diapers

Abstract

This invention relates to the field of hygiene products, specifically to a method for preparing baby diapers and the baby diapers themselves. The method includes: preparing each layer, including a composite top layer, an absorbent core, and a bottom layer. The composite top layer includes a surface layer and a distribution layer, wherein the length of the surface layer is shortened by shaving. The layers are then composited to form the baby diaper. During the composite molding process, the fibers of each layer are melted and compacted through hot pressing, resulting in a dense structure without loose fibers or capillary-like gaps, forming water-blocking strips. The baby diaper prepared using this method uses shaving and welding to add water-blocking strips to physically cut off the backward flow path of urine and solid excrement. Furthermore, leak-proof pockets are added to the front and / or back of the diaper to collect and prevent spillage; these leak-proof pockets also function as an elastic waistband.

Description

Technical Field

[0001] This invention relates to the field of hygiene products, specifically to a method for preparing baby diapers and baby diapers. Background Technology

[0002] Currently, conventional baby diapers frequently leak from the back waist and back when the baby is lying flat, sleeping, rolling over, or crawling, causing great inconvenience to users. The core defects of existing technology include: 1. The water-conducting path is not cut off at the source: The surface layer and the flow-conducting layer are mostly continuous and long designs, which limit the natural capillary water-conducting channels themselves. Urine can continue to spread along the surface layer and the flow-conducting layer towards the back waist, and cannot be intercepted by the rear leak pocket. 2. Rear leak pocket fixation method: The rear leak pocket is mostly glued, which is not only prone to problems such as glue coming undone, lifting edges, glue seepage and hardening, but more importantly, the glue cannot destroy the water-conducting ability of the drainage layer, and urine can still seep back along the drainage layer. 3. The back leak pocket has an unreasonable structural design: The opening size of the back leak pocket is fixed and cannot be adapted to the different waist sizes and activity patterns of infants, which can easily create gaps in the fit and become leak points.

[0003] It is very important to develop a baby diaper that effectively prevents back leakage. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] The present invention provides the following technical solutions to solve one or more of the above-mentioned technical problems: This invention proposes a method for preparing baby diapers, the method comprising: S1. Preparation of each layer, including a composite surface layer, an absorber, and a bottom layer. The composite surface layer includes a surface layer and a flow guiding layer. The preparation process of the composite surface layer includes: S1.1.1, Short cut to form the surface layer; S1.1.2, The surface layer and the flow guide layer are combined, wherein the length of the surface layer is less than or equal to the length of the product, and the rear end of the surface layer is located in front of the rear end of the flow guide layer; S1.1.3. Cut and seal the edges of the composite surface layer to form a water-blocking strip; S2. Each layer is composited and molded to form a baby diaper.

[0006] In some implementations... The front end of the surface layer is aligned with the front end of the flow guide layer or is located behind the front section of the flow guide layer; The cut edges are sealed using ultrasonic or hot pressing methods.

[0007] In some embodiments, the types of layers include elastic leak-proof covers, and the manufacturing process of elastic leak-proof covers includes: S1.2.1 Obtain the non-woven fabric for the leaky pocket; S1.2.2 Arrange and fix elastic bands on the non-woven fabric of the back pocket; S1.2.3, Folding to form an elastic leak-proof pocket.

[0008] In some implementations... The layer types also include side guards, with the two ends of the elastic leak-proof pocket bonded between the side guards and the composite surface layer. The elastic bands on the nonwoven fabric of the elastic leak-proof pocket are arranged in regions, each region including several elastic band areas, the distance between adjacent elastic band areas is not zero, and at least the innermost elastic band area in the region is arranged with elastic bands.

[0009] In some embodiments, no elastic bands are arranged on other elastic band areas within the region. The layer type includes a built-in elastic waistband, which is correspondingly provided with an elastic leak-proof pocket. The preparation process of the built-in elastic waistband includes: S1.3.1 Obtain the non-woven fabric with built-in elastic waistband; S1.3.2 Arrange and fix elastic bands on the built-in elastic waistband; S1.3.3, Folding to form an internal elastic waistband.

[0010] In some embodiments, the elastic band arrangement area on the built-in elastic waistband nonwoven fabric is positioned to avoid the innermost elastic band area in the region.

[0011] In some implementations, the process of composite molding at each level is as follows: The main body is composited by combining the prepared bottom layer, built-in elastic waistband, absorbent material, composite surface layer, elastic leak-proof pocket, and side guards. The built-in elastic waistband is located between the composite surface layer and the bottom layer. The elastic leak-proof pocket is flush with or unequal in length and width to the main built-in elastic waistband. The built-in elastic waistband and the elastic leak-proof pocket are correspondingly set and are located on the front and / or back of the product. Multi-layer synchronous welding: After the elastic leak-proof pocket is combined with the composite surface layer and side guards, a water-blocking strip is welded to the outside of the elastic band area in the area. After welding, the composite surface layer and the elastic leak-proof pocket are completely fused together, completely losing their capillary water conduction ability, forming a completely water-proof physical barrier.

[0012] In some implementations, several elastic bands are also arranged in other elastic band areas within the region.

[0013] In some implementations, the process of composite molding at each level is as follows: The main body is composite, which combines the prepared bottom layer, absorbent body, composite surface layer, elastic leak-proof pocket, and side guards; Multi-layer synchronous welding is performed, and two continuous longitudinal welded water-blocking strips are set along the elastic leak-proof pocket towards the bottom layer. The water-blocking strips are set to avoid the area where the elastic bands are arranged. After welding, the composite surface layer and the elastic leak-proof pocket are completely fused together and completely lose their capillary water-conducting ability.

[0014] Baby diapers, which are prepared using any of the above-described methods for preparing baby diapers.

[0015] The method for preparing baby diapers described in this invention can create diapers that shorten the surface layer by cutting it short and add water-resistant strips by welding to physically cut off the backward flow path of urine and solid excrement. Furthermore, elastic leak-proof pockets are added to the front abdomen and / or back waist of the diaper to collect and prevent spillage; these elastic leak-proof pockets also function as elastic waistbands. Baby diapers prepared using the method described in this invention have at least two water-resistant strips, providing excellent flow interruption and effectively improving the prevention of front and / or back leakage. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the structure of a baby diaper with a single elastic waistband in some embodiments of the present invention; Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure of the middle BB section; Figure 3 yes Figure 2 Enlarged view of section A; Figure 4 This is a schematic diagram of surface layer short cutting and welding; Figure 5 yes Figure 1 Schematic diagram of the cross-sectional structure of the middle AA section; Figure 6 This is a schematic diagram of the elastic leak-proof pocket of a baby diaper with a single elastic waistband in some embodiments of the present invention; Figure 7This is a schematic diagram of the elastic leak-proof pocket of the baby diaper with double elastic waistband in some embodiments of the present invention; Figure 8 This is a schematic diagram of the built-in elastic waistband of the baby diaper with double elastic waistband in some embodiments of the present invention; Figure 9 This is a schematic diagram of the welding of multi-layer materials in a single elastic waistband baby diaper according to some embodiments of the present invention; Figure 10 This is a schematic diagram of the structure of a baby diaper with a double elastic waistband in some embodiments of the present invention; Figure 11 yes Figure 10 Schematic diagram of the cross-sectional structure between B1 and B1; Figure 12 yes Figure 10 Schematic diagram of the cross-sectional structure between A1 and A1; Figure 13 This is a schematic diagram of the welding of multi-layer materials in a baby diaper with a double elastic waistband in some embodiments of the present invention; Figure 14 This is a process flow diagram of the preparation of the single elastic waistband baby diaper in Embodiment 1 of the present invention; Figure 15 This is a process flow diagram of the preparation of the double elastic waistband baby diaper in Embodiment 2 of the present invention; Figure 16 This is a schematic diagram of the structure of the baby diaper described in Embodiment 3 of the present invention; Figure 17 This is a schematic diagram of the structure of the second elastic leak-proof pocket described in Embodiment 3 of the present invention; Figure 18 This is a schematic diagram of the built-in elastic waistband described in Embodiment 3 of the present invention; Figure 19 This is a cross-sectional structural diagram of the second elastic leak-proof pocket described in Embodiment 3 of the present invention; Figure 20 yes Figure 16 Schematic diagram of the cross-sectional structure between B2 and B2; Figure 21 This is a schematic diagram of the structure of the baby diaper described in Embodiment 4 of the present invention; Figure 22 yes Figure 21 Schematic diagram of the cross-sectional structure between B3 and B3; Figure 23 This is a schematic diagram of the structure of the leak-proof cover unit in Embodiment 4 of the present invention. Detailed Implementation

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0019] Secondly, the present invention will be described in detail with reference to the schematic diagrams. When describing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure will be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include the three-dimensional spatial dimensions of length, width, and depth.

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0021] Example 1 Combination Figure 1-6 As shown in 9 and 14, this embodiment proposes a method for preparing baby diapers, including the following steps: S1. Preparation of each layer, including side guards 6, composite surface layer, first elastic leak-proof pocket 3-1, absorbent body 7, and bottom layer. When the side guard 6 is made of non-woven fabric, it can be directly cut and obtained. When the side guard 6 is a three-dimensional guard, the specific process is as follows: the side non-woven fabric is cut, sprayed with adhesive, and three-dimensional elastic bands 9 are arranged. The arrangement parameters of the three-dimensional elastic bands 9 are as follows: the number of three-dimensional elastic bands 9 arranged in a single-sided three-dimensional guard is 3, from the inside to the outside (from the direction closer to the center of the baby diaper to the direction farther from the center of the baby diaper, the direction closer to the center of the baby diaper is the inside, and the direction farther from the center of the baby diaper is the outside), namely the first three-dimensional elastic band, the second three-dimensional elastic band, and the third three-dimensional elastic band. The arrangement spacing of the three-dimensional elastic bands is: the distance between the first three-dimensional elastic band and the second three-dimensional elastic band can be 4mm, and the distance between the second three-dimensional elastic band and the third three-dimensional elastic band can be 11mm. Then, the non-woven fabric is folded for the first time, and then the non-woven fabric is further folded outward and sprayed with adhesive J5, and then folded for the second time, that is, folded outward, to form the side guard 6.

[0022] The composite surface layer may include a surface layer 1 and a flow guiding layer 2, and the preparation process of the composite surface layer may include: S1.1.1 After spraying adhesive J4 onto the sheet forming the surface layer 1, the sheet is cut short to form a surface layer 1 that can be combined with the flow-guiding layer 2. The length of the surface layer 1 is Lm1 (when the prepared baby diaper is size M, Lm1 can be 356 mm). S1.1.2, The surface layer 1 and the flow guide layer 2 are combined. The length of the surface layer 1 is less than the length of the flow guide layer 2. The rear end of the surface layer 1 is located in front of the rear end of the flow guide layer 2. The length Lm2 of the flow guide layer 2 is equal to the length Lc of the product (i.e., the baby diaper produced). The distance from the rear edge of the surface layer 1 to the rear end of the product (i.e., the rear end of the flow guide layer 2) is Lm3 (when the prepared baby diaper is size M, both Lm2 and Lc are 400 mm, and Lm3 is 44 mm). S1.1.3. Cut and seal the edges of the composite surface layer 1. Specifically, the cutting and sealing can be done by ultrasonic or hot pressing. The application of ultrasonic or hot pressing can melt and solidify the cut fibers in one go, without loose fibers or capillary water-conducting gaps, forming a water-blocking strip ZD1, forming a composite surface layer. The sealing can be done by continuous embossing (i.e., without patterns). The cutting and sealing position described here can correspond to the setting position of the subsequent first elastic leak-proof pocket 3-1 (the end position Z of the surface layer is below the rear leak pocket), so that the flow guiding layer 2 will not be exposed when the first elastic leak-proof pocket 3-1 is opened.

[0023] The length Ld1 of the edge seal (i.e., water-blocking strip ZD1) formed by the above-mentioned cutting and sealing treatment, the maximum width of the surface layer 1 is Wm1, the maximum width of the flow guiding layer 2 is Wm2, Ld1 can be greater than or equal to Wm1 and less than or equal to Wm2; the width Wd1 of the edge seal can be greater than or equal to 1 mm, such as 10 mm.

[0024] Both the surface layer 1 and the flow guiding layer 2 can be made of non-woven fabric. The surface layer 1 can also be a 3D embossed surface layer, such as an online 3D embossed surface layer. The surface layer 1 can be formed by online hot pressing of the upper surface layer 1-1 and the lower surface layer 1-2. The upper surface layer 1-1 and the lower surface layer 1-2 can be made of non-woven fabric.

[0025] The preparation process of absorber 7 may include: S1.2.1 Preparation of the core: The core can be formed by mixing wood pulp pulverization with superabsorbent polymer. S1.2.2, Bottom of the coated fabric spray-adhesive composite core, S1.2.3. Spray adhesive onto the surface of the core, then fold the covering fabric upwards to cover the core and form a composite core. S1.2.4. Short-cut composite core to form absorber. The composite core described here can also be replaced by existing offline composite cores.

[0026] The preparation process of the first elastic leak-proof pocket 3-1 can be as follows: Elastic bands are arranged in the first elastic band area X and the second elastic band area X1 on the nonwoven fabric of the back leak pocket. For example, the number of elastic bands in the first elastic band area X on the product is 4, and the arrangement spacing can be 3.125mm. The number of elastic bands in the second elastic band area X1 is 8, and the arrangement spacing can be 3.125mm. The distance Wj between the first elastic band area X and the second elastic band area X1 can be 25mm. Then, the nonwoven fabric of the back leak pocket is sprayed with glue G to form the first elastic leak pocket 3-1. When the prepared baby diaper is size M, the width Wh of the first elastic leak pocket 3-1 can be 70mm and the length Lh can be 310mm.

[0027] The bottom layer may include a bottom nonwoven fabric 4 and a bottom film 5. The preparation process of the bottom layer may be as follows: The process of preparing the bottom layer may include spraying adhesive onto one end face of the bottom film 5 and laminating it onto one end face of the bottom nonwoven fabric 4. Urine indicator adhesive J2 may be applied to the other end face of the bottom film 5 (the side closer to the skin), and adhesive J3 may be applied to the front waist patch 13 and laminated onto the other end face of the bottom nonwoven fabric 4 (the side away from the skin).

[0028] S2. Layer-by-layer lamination and molding to form a baby diaper. The layer-by-layer lamination and molding process may include: S2.1.1 Main body composite: The prepared bottom layer, absorbent body 7, composite surface layer, first elastic leak-proof pocket 3-1, and side guard 6 are composited together. S2.2.2 Multi-layer synchronous welding: Along the direction from the first elastic leak-proof pocket 3-1 to the bottom non-woven fabric 4, a continuous longitudinal direction (i.e., the product width W direction) is set to weld the first water-blocking strip ZD2-1 and the second water-blocking strip ZD2-2. The width Wd2-1 of the first water-blocking strip ZD2-1 is 5mm, and the width Wd2-2 of the second water-blocking strip ZD2-2 is 12mm. The length of the first water-blocking strip ZD2-1 is Ld2-1, and the length of the second water-blocking strip ZD2-2 is Ld2-2. The second water-blocking strip ZD2-2 can extend through the entire width W of the product or be greater than or equal to the maximum width Wm1 of the surface layer (Ld2-1 and Ld2-2 are greater than or equal to Wm1 and less than or equal to W). It is welded using a hot-pressing method, which can be a continuous embossing, i.e., without patterns. Then, the first elastic leak-proof pocket 3, side guards 6, composite surface layer, and bottom layer are simultaneously melted and bonded together. After welding, the composite surface layer, the first elastic leak-proof pocket 3-1, and the bottom layer are completely fused together, completely losing their capillary water-conducting ability, forming a completely water-proof physical barrier. The distance Lm4 from the position of the second water-blocking strip ZD2-1 to the rear end of the product is 40mm. The first water-blocking strip ZD2-1 is positioned in front of the second water-blocking strip ZD2-2.

[0029] The depth K of the opening on the first elastic leak-proof pocket 3-1 is greater than or equal to 10 mm, such as 32 mm. The value of K can be determined by the position of the second water-blocking strip ZD2-1.

[0030] The aforementioned first elastic leak-proof pocket 3-1 can function as both a back pocket and an elastic waistband.

[0031] The subsequent steps include R-cutting → bi-folding → final cutting to form packaged baby diapers. This process is completely consistent with existing diaper production lines and will not be elaborated here.

[0032] Waist stickers 10 can be laminated onto the aforementioned side guardrail 6. The specific process can be performed before S2. The specific process is as follows: apply adhesive J6 to the substrate of the waist sticker 10 (which can be non-woven fabric) to laminate with magic hooks 11, cut with S to form the initial products of waist stickers 10 corresponding to the left and right sides of the product, apply fixing adhesive J7, and cut short to form the waist stickers 10 corresponding to the left and right sides of the product. Finally, these two pieces of waist stickers 10 can be laminated onto the non-woven fabric of the side guardrail 6 respectively.

[0033] Leg elastic bands 12 can be laminated between the above-mentioned composite surface layer and the bottom layer. The arrangement parameters of the leg elastic bands 12 can be as follows: there are 2 leg elastic bands 12 on each side, and the arrangement spacing can be 5mm.

[0034] By designing the above-mentioned short cut and first elastic leak-proof pocket 3-1 and other structures, the water conductivity of the composite surface layer is destroyed. Even if urine crosses the short cut area Lm3 of surface layer 1 (the area between the rear edge of surface layer 1 and the rear edge of the guide layer 2), it will be completely blocked by these two water-blocking strips (first water-blocking strip ZD2-1 and second water-blocking strip ZD2-2), and cannot continue to penetrate backward, thus fundamentally solving the problem of back leakage.

[0035] The aforementioned water-blocking strip ZD1 and the first water-blocking strip ZD2-1 are both located on the rear side of the absorber 7.

[0036] Example 2 Combination Figure 7-8 As shown in 10-13 and 15, this embodiment proposes a method for preparing baby diapers. The method for preparing baby diapers includes the following steps: S1. Preparation of each layer, including side panels 6, second elastic leak-proof pockets 3-2, composite surface layer, absorbent core, built-in elastic waistband 3-3, and bottom layer. When the side guard 6 is made of non-woven fabric, it can be directly cut and obtained. When the side guard 6 is a three-dimensional guard, the specific process is as follows: the side non-woven fabric is cut, sprayed with adhesive, and three-dimensional elastic bands 9 are arranged. The arrangement parameters of the three-dimensional elastic bands 9 are as follows: the number of three-dimensional elastic bands 9 arranged in a single-sided three-dimensional guard is 3, from the inside to the outside (from the direction closer to the center of the baby diaper to the direction farther away from the center of the baby diaper), which are the first three-dimensional elastic band, the second three-dimensional elastic band and the third three-dimensional elastic band. The arrangement spacing of the three-dimensional elastic bands is as follows: the distance between the first three-dimensional elastic band and the second three-dimensional elastic band can be 4mm, and the distance between the second three-dimensional elastic band and the third three-dimensional elastic band can be 11mm. Then, the non-woven fabric is folded for the first time, and then the non-woven fabric is further folded outward and sprayed with adhesive J5. Then, the second folding is performed, that is, the outward folding, which forms the side guard 6.

[0037] The composite surface layer may include a surface layer 1 and a flow guiding layer 2, and the preparation process of the composite surface layer may include: S1.1.1 After spraying adhesive J4 onto the sheet forming the surface layer 1, the sheet is cut short to form a surface layer 1 that can be combined with the flow-guiding layer 2. The length of the surface layer 1 is Lm1 (when the prepared baby diaper is size M, Lm1 can be 356 mm). S1.1.2, The surface layer 1 and the flow guide layer 2 are combined. The length of the surface layer 1 is less than the length of the flow guide layer 2. The rear end of the surface layer 1 is located in front of the rear end of the flow guide layer 2. The length Lm2 of the flow guide layer 2 is equal to the length Lc of the product (i.e., the baby diaper produced). The distance from the rear edge of the surface layer 1 to the rear end of the product (i.e., the rear end of the flow guide layer 2) is Lm3 (when the prepared baby diaper is size M, both Lm2 and Lc are 400 mm, and Lm3 is 44 mm). S1.1.3. The composite surface layer 1 is cut and sealed. Specifically, the cut and sealing can be done by ultrasonic or hot pressing. The application of ultrasonic or hot pressing can melt and solidify the cut fibers in one go, without loose fibers or capillary water-conducting gaps, forming a water-blocking strip ZD1, thus forming the composite surface layer. The sealing can be done by continuous embossing (i.e., without patterns). The cut and sealing position described here can correspond to the setting position of the subsequent second elastic leak-proof pocket 3-2 (the end position Z of the surface layer is below the rear leak-proof pocket), so that the flow-guiding layer 2 will not be exposed when the second elastic leak-proof pocket 3-2 is opened.

[0038] The length Ld1 of the edge seal (i.e., water-blocking strip ZD1) formed by the above-mentioned cutting and sealing treatment, the maximum width of the surface layer 1 is Wm1, the maximum width of the flow guiding layer 2 is Wm2, Ld1 can be greater than or equal to Wm1 and less than or equal to Wm2; the width Wd1 of the edge seal can be greater than or equal to 1 mm, such as 10 mm.

[0039] Both the surface layer 1 and the flow guiding layer 2 can be made of non-woven fabric. The surface layer 1 can also be a 3D embossed surface layer, such as an online 3D embossed surface layer. The surface layer 1 can be formed by online hot pressing of the upper surface layer 1-1 and the lower surface layer 1-2. The upper surface layer 1-1 and the lower surface layer 1-2 can be made of non-woven fabric.

[0040] The preparation process of absorber 7 may include: S1.2.1 Preparation of the core: The core can be formed by mixing wood pulp pulverization with superabsorbent polymer. S1.2.2, Bottom of the coated fabric spray-adhesive composite core, S1.2.3. Spray adhesive onto the surface of the core, then fold the covering fabric upwards to cover the core and form a composite core. S1.2.4. Short-cut composite core to form absorber. The composite core described here can also be replaced by existing offline composite cores.

[0041] The preparation process of the second elastic leak-proof pocket 3-2 can be as follows: Elastic bands 8-1 are arranged in the first elastic band area X on the back leak pocket nonwoven fabric. For example, the number of elastic bands in the first elastic band area X on the product is 4, and the arrangement spacing can be 3.125mm. Then, the back leak pocket nonwoven fabric is sprayed with glue G to form the second elastic leak pocket 3-2. The width Wh1 of the second elastic leak pocket 3-2 can be 70mm, and the length Lh1 can be 310mm.

[0042] The process of preparing the built-in elastic waistband 3-3 is as follows: Eight elastic bands (8-2) are arranged in the third elastic band area X2 on the nonwoven fabric, with a spacing of 3.125 mm between each band. The nonwoven fabric is then sprayed with adhesive and folded to form the built-in elastic waistband 3-3. The width Wn of the built-in elastic waistband 3-3 is 70 mm, and the length Ln is 310 mm. The third elastic band area X2 can correspond to the second elastic band area X1 on the nonwoven fabric of the back pocket in Example 1 (the third elastic band area X2 and the second elastic band area X1 can overlap when forming the product). The first elastic band area X can be in the same position as the first elastic band area X1 in Example 1. The bottom layer may include a bottom nonwoven fabric 4 and a bottom film 5. The preparation process of the bottom layer may be as follows: The process of preparing the bottom layer may include spraying adhesive onto one end face of the bottom film 5 and laminating it onto one end face of the bottom nonwoven fabric 4. Urine indicator adhesive J2 may be applied to the other end face of the bottom film 5, and adhesive J3 may be applied to the front waist patch 13 and laminated onto the other end face of the bottom nonwoven fabric 4.

[0043] S2. Layer-by-layer lamination and molding to form a baby diaper. The layer-by-layer lamination and molding process may include: S2.1.1, Main body composite: The prepared side guard 6, elastic second rear leak pocket 3-2, composite surface layer, absorbent body 7, built-in elastic waistband 3-3 and bottom layer are composited together. S2.2.2 Multi-layer synchronous welding: Along the direction of the guide layer 2 from the second elastic leak-proof pocket 3-2, a third water-blocking strip ZD3 is formed by hot pressing. After welding, the surface layer 1, the guide layer 2, and the rear leak pocket 3 are completely fused together, completely losing their capillary water-conducting ability and forming a completely water-proof physical barrier. The width Wd3 of the third water-blocking strip ZD3 can be 43mm, and the length of the third water-blocking strip ZD3 (which can be Ld3) can run through the entire width of the product or be greater than or equal to the maximum width of the surface layer; the hot pressing can be continuous embossing, i.e., without patterns. The third water-blocking strip ZD3 can be set behind the first elastic band area X, without avoiding the second elastic band area X1. The corresponding position of the second elastic band area X1 can be completely welded, and glue J1 is not required.

[0044] The depth K of the opening on the second elastic leak-proof pocket 3-2 is greater than or equal to 10 mm, such as 32 mm. The value of K can be determined by the position of the third water-blocking strip ZD3.

[0045] The subsequent steps include R-cutting → bi-folding → final cutting to form packaged baby diapers. This process is completely consistent with existing diaper production lines and will not be elaborated here.

[0046] Waist stickers 10 can be laminated onto the aforementioned side guardrail 6. The specific process can be performed before S2. The specific process is as follows: apply adhesive J6 to the substrate of the waist sticker 10 (which can be non-woven fabric) to laminate with magic hooks 11, cut with S to form the initial products of waist stickers 10 corresponding to the left and right sides of the product, apply fixing adhesive J7, and cut short to form the waist stickers 10 corresponding to the left and right sides of the product. Finally, these two pieces of waist stickers 10 can be laminated onto the non-woven fabric of the side guardrail 6 respectively.

[0047] Leg elastic bands 12 can be laminated between the above-mentioned composite surface layer and the bottom layer. The arrangement parameters of the leg elastic bands 12 can be as follows: there are 2 leg elastic bands 12 on each side, and the arrangement spacing can be 5mm.

[0048] Using the methods for preparing baby diapers described in Examples 1 and 2 above, baby diapers with a single elastic waistband (first elastic leak-proof pocket 3-1) and baby diapers with a double elastic waistband (second elastic leak-proof pocket 3-2 + built-in elastic waistband 3-3) can be prepared respectively.

[0049] Both the aforementioned water-blocking strip ZD1 and the third water-blocking strip ZD3 can be installed on the outside of the absorber 7.

[0050] Example 3: Further optimizations were made based on Example 2.

[0051] like Figure 16-20As shown, The second elastic leak-proof pocket 3-2 has a width Wh2 of 65mm and a length Lh2 of 200mm. The second elastic leak-proof pocket 3-2 is folded in a G-shape, as shown below. Figure 19 As shown, folds Z1, Z2, and Z3 are all equal to the width Wh2 of the second elastic leak-proof pocket 3-2, which is 65mm. Z2 and Z3 are glued together near the rear of the product. Z3 is also glued to the surface layer 1.

[0052] The advantage of this design is that the liquid is stored between Z2 and Z3, and the non-woven fabric of the back pocket is a water-repellent material, which reduces the liquid's residence on the surface layer and thus reduces the liquid's flow towards the back of the product.

[0053] The built-in elastic waistband 3-3 has a width Wn1 of 70mm and a length Ln1 of 310mm. The arrangement of the elastic bands in the built-in elastic waistband 3-3 perfectly fills the gap in the elastic band of the back pocket. In fact, the elastic band in the middle LD of the Wj elastic band area needs to be cut to ensure that the middle of the product is flat, thereby ensuring the size of the back pocket along the width direction of the product.

[0054] The advantage of this design is that it fits the baby's lower back better.

[0055] The bottom offset Hc of the second elastic leak-proof pocket 3-2 and the built-in elastic waistband 3-3 can be 10mm.

[0056] Example 4: like Figure 21-23 As shown Optimization based on Example 3 A third leak-proof pocket 3-5 has been added to the front of the product. The width Wh5 of the third leak-proof pocket 3-5 can be 30mm and the length Lh5 can be 200mm. The second elastic leak-proof pocket 3-2 has a width Wh4 of 72mm and a length Lh4 that is the same as the third leak-proof pocket 3-5, which is 200mm. The third leak-proof pocket 3-5 on the previous product and the second elastic leak-proof pocket 3-2 on the subsequent product can be composited from the same rear leak-proof pocket monomer at the same time. They can be separated at the final product cutting stage, i.e., the width of the rear leak-proof pocket monomer Wh6 = Wh4 + Wh5.

[0057] The opening depth K2 of the third leak-proof pocket 3-5 can be 25m.

[0058] The aforementioned undisclosed matters can be directly implemented using existing technologies, so they will not be elaborated upon here.

[0059] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for preparing baby diapers, characterized in that, Preparation methods include S1. Preparation of each layer, including a composite surface layer, an absorber, and a bottom layer. The composite surface layer includes a surface layer and a flow guiding layer. The preparation process of the composite surface layer includes: S1.1.1, Short cut to form the surface layer; S1.1.2, The surface layer and the flow guide layer are combined, wherein the length of the surface layer is less than or equal to the length of the product, and the rear end of the surface layer is located in front of the rear end of the flow guide layer; S1.1.

3. Cut and seal the edges of the composite surface layer to form a water-blocking strip; S2. Each layer is composited and molded to form a baby diaper.

2. The method for preparing baby diapers according to claim 1, characterized in that, The front end of the surface layer is aligned with the front end of the flow guide layer or is located behind the front section of the flow guide layer; The cut edges are sealed using ultrasonic or hot pressing methods.

3. The method for preparing baby diapers according to claim 1, characterized in that, The types of layers include elastic leak-proof covers, and the manufacturing process of elastic leak-proof covers includes: S1.2.1 Obtain the non-woven fabric for the leaky pocket; S1.2.2 Arrange and fix elastic bands on the non-woven fabric of the back pocket; S1.2.3, Folding to form an elastic leak-proof pocket.

4. The method for preparing baby diapers according to claim 3, characterized in that, The layer types also include side guards, with the two ends of the elastic leak-proof pocket bonded between the side guards and the composite surface layer. The elastic bands on the nonwoven fabric of the elastic leak-proof pocket are arranged in regions, each region including several elastic band areas, the distance between adjacent elastic band areas is not zero, and at least the innermost elastic band area in the region is arranged with elastic bands.

5. The method for preparing baby diapers according to claim 4, characterized in that, No elastic bands are arranged on other elastic band areas within the specified area. The layer types include built-in elastic waistbands, which are correspondingly set with elastic leak-proof pockets. The manufacturing process of the built-in elastic waistbands includes: S1.3.1 Obtain the non-woven fabric with built-in elastic waistband; S1.3.2 Arrange and fix elastic bands on the built-in elastic waistband; S1.3.3, Folding to form an internal elastic waistband.

6. The method for preparing baby diapers according to claim 5, characterized in that, The elastic band arrangement area on the built-in elastic waistband nonwoven fabric avoids the innermost elastic band area in the region.

7. The method for preparing baby diapers according to claim 5, characterized in that, The process of composite molding at each level is as follows: The main body is composited by combining the prepared bottom layer, built-in elastic waistband, absorbent material, composite surface layer, elastic leak-proof pocket, and side guards. The built-in elastic waistband is located between the composite surface layer and the bottom layer. The elastic leak-proof pocket is flush with or unequal in length and width to the main built-in elastic waistband. The built-in elastic waistband and the elastic leak-proof pocket are correspondingly set and are located on the front and / or back of the product. Multi-layer synchronous welding: After the elastic leak-proof pocket is combined with the composite surface layer and side guards, a water-blocking strip is welded to the outside of the elastic band area in the area. After welding, the composite surface layer and the elastic leak-proof pocket are completely fused together, completely losing their capillary water conduction ability, forming a completely water-proof physical barrier.

8. The method for preparing baby diapers according to claim 4, characterized in that, Several elastic bands are also arranged in other elastic band areas within the area.

9. The method for preparing baby diapers according to claim 8, characterized in that, The process of composite molding at each level is as follows: The main body is composite, which combines the prepared bottom layer, absorbent body, composite surface layer, elastic leak-proof pocket, and side guards; Multi-layer synchronous welding is performed, and two continuous longitudinal welded water-blocking strips are set along the elastic leak-proof pocket towards the bottom layer. The water-blocking strips are set to avoid the area where the elastic bands are arranged. After welding, the composite surface layer and the elastic leak-proof pocket are completely fused together and completely lose their capillary water-conducting ability.

10. Baby diapers, characterized in that, The baby diaper is prepared using the method for preparing baby diapers according to any one of claims 1 to 9.

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