Method and system for manufacturing an absorbent article

Abstract

The manufacturing method of the absorbent article comprises: a first composite semi-product forming process; the first composite semi-product forming process arranges a first composite drum, the first composite drum comprising a first composite position; the first composite drum composites a pocket material composite semi-product and a pair of leakage-proof material continuous sheets at the first composite position to form a first composite semi-product; a second composite semi-product forming process; the second composite semi-product forming process arranges a second composite drum, the second composite drum comprising a second composite position; the second composite drum composites an elastic waistband and a liquid-impervious continuous sheet at the second composite position to form a second composite semi-product; a total composite process; the first composite drum and the second composite drum composite the first composite semi-product, an absorbent body and the second composite semi-product at a third composite position to form an absorbent article continuum. The first composite drum and the second composite drum concentrate on the composite process, thereby reducing the elastic component retraction and avoiding the generation of wrinkles on the absorbent article continuum.

Description

Technical Field

[0001] This invention relates to the field of disposable hygiene product manufacturing technology, particularly to baby diapers, adult diapers, etc., and especially to a method and system for manufacturing absorbent articles. Background Technology

[0002] Absorbent products, such as baby or adult diapers, are pant-shaped absorbent items that generally consist of a liquid-permeable top layer on the skin side, a liquid-impermeable bottom layer on the non-skin side, and an absorbent core between the two. Longitudinally, they have a front waistband located on the wearer's abdomen, a back panel located on the wearer's back, and a crotch area located between the front waistband and the back panel. Left and right waistbands are located on both sides of the back panel, and a front waistband is located on the non-skin side of the front waistband. The left and right waistbands and the front waistband can be repeatedly attached to form a pant-shaped absorbent product with one waist opening and two leg openings.

[0003] The core function of absorbent fabrics is to absorb and store bodily waste such as urine and feces. This prevents bodily waste from soiling or contaminating the wearer's clothing or other products that may come into contact with the wearer, such as bedding, thus keeping the wearer feeling dry.

[0004] Existing absorbent diapers typically feature a pocket material on the back side facing the wearer's skin. This pocket material has a fixed section and a free section. The fixed section is attached to the skin side of the liquid-permeable surface layer, while the free section is separate from the liquid-permeable surface layer, creating a space between the free section and the liquid-permeable surface layer to accommodate bodily excrement; this is also known as a leak-proof pocket. This pocket material usually has elastic components in both the fixed and free sections to provide elasticity for the waistband and pocket opening area. However, the effective range of adjustable elasticity for this type of absorbent diaper is relatively narrow. Since both the front waistband and back of the diaper require a certain degree of elasticity, especially the back, which needs greater elasticity, this is because when wearing a diaper, the left and right waistbands located at the back need to be aligned with the front waistband at the front. This results in insufficient elastic support at the back, easily creating a tight and constricting feeling around the wearer's waist during wear, severely reducing wearing comfort and fit.

[0005] To address the aforementioned technical issues of narrow effective elastic zones and insufficient elastic support in the front waist and back (especially the back), an improved solution is needed to add an elastic waistband to the back. This newly added elastic area overlaps with the thickness of the pocket material. At the same time, the elasticity of the area where the elastic waistband overlaps with the absorbent body needs to be weakened to balance the elastic fit of the waist and the structural stability of the absorbent body. However, new technical problems have arisen during the actual industrial production of this improved absorbent product.

[0006] Specifically, elastic structures with elastic components, such as elastic waistbands, pocket materials, and leak-proof materials, need to be multi-layered and laminated with a liquid-permeable top layer (surface sheet), absorbent core, and non-liquid-permeable bottom layer (impermeable sheet). Furthermore, each elastic structure requires multiple processing steps during manufacturing, including cutting the elastic components, trimming the sheet, reversing the direction, and adjusting the spacing. In existing production processes, the conveying and lamination processes for each component are independent and dispersed, which can easily lead to the elastic components shrinking before lamination and wrinkles forming in the sheets laminated at each step. This results in wrinkles in the final continuous absorbent product, directly affecting its quality. Summary of the Invention

[0007] This invention provides a method and system for manufacturing absorbent articles to solve the technical problem in existing absorbent article manufacturing processes where elastic waistbands, pocket materials, and leak-proof materials with elastic components are easily contracted in the CD direction during the composite process with surface sheets, absorbent bodies, and impermeable sheets, resulting in wrinkles in the continuous absorbent article and thus affecting the appearance and absorption effect of the absorbent article.

[0008] The technical solution provided by this invention is as follows: One object of the present invention is to provide a method for manufacturing an absorbent article, the method comprising: Pocket material composite semi-finished product formation process: The pocket material is laminated with the surface continuous sheet to form the pocket material composite semi-finished product; First composite semi-finished product forming process: The first composite semi-finished product forming process includes a first composite drum, the first composite drum including a first composite position; The first composite drum is located at the first composite position, where the pocket material composite semi-finished product is combined with a pair of leak-proof material continuous sheets to form the first composite semi-finished product; Second composite semi-finished product forming process: The second composite semi-finished product forming process includes a second composite drum, the second composite drum including a second composite position; The second composite drum, at the second composite position, combines the elastic waistband with the liquid-impermeable continuous sheet to form a second composite semi-finished product; Overall composite process: The first composite drum and the second composite drum are arranged opposite to each other and tangentially form a third composite position; at the third composite position, the first composite drum and the second composite drum combine the first composite semi-finished product, the absorbent and the second composite semi-finished product to form an absorbent article continuous body; Wherein, the first composite drum forms a first negative pressure zone inside the arc between the first composite position and the third composite position; A clamping roller is arranged on the downstream side of the third composite position, and the clamping roller is tangent to the second composite drum to form an output position; The second composite drum forms a second negative pressure zone inside the arc between the second composite position and the output position; Expanding process: Located downstream of the pocket material composite semi-finished product forming process and upstream of the first composite semi-finished product forming process, used to expand and flatten the pocket material composite semi-finished product along the CD direction.

[0009] In a preferred embodiment, the widening process includes a first negative pressure adsorption and conveying process and an expansion process: First negative pressure adsorption and conveying process: The composite semi-finished product of the pocket material is conveyed to the expansion process by negative pressure adsorption. Wherein, the negative pressure adsorption force experienced by the pocket material composite semi-finished product when entering the first negative pressure adsorption and conveying process is greater than the negative pressure adsorption force experienced by the pocket material composite semi-finished product when leaving the first negative pressure adsorption and conveying process; Extended process: Located downstream of the first negative pressure adsorption and conveying process, it is equipped with an expansion unit to apply tension to both ends of the pocket material composite semi-finished product along the CD direction, so that the pocket material composite semi-finished product remains flat and wrinkle-free, and is conveyed to the first composite semi-finished product forming process.

[0010] In a preferred embodiment, the first negative pressure adsorption conveying process is provided with a first negative pressure adsorption device; The first negative pressure adsorption device conveys the composite semi-finished product of the pocket material to the expansion process by negative pressure adsorption. The first negative pressure adsorption device includes a conveyor belt, a first negative pressure adsorption component, a second negative pressure adsorption component, and a conveyor belt that is circumferentially wrapped around the outside of the first negative pressure adsorption component and the second negative pressure adsorption component. The first negative pressure adsorption component is arranged upstream of the second negative pressure adsorption component, and the second negative pressure adsorption component has an arc-shaped structure at one end near the first negative pressure adsorption component, thereby changing the conveying path of the composite semi-finished product of the pocket material. The negative pressure adsorption force inside the first negative pressure adsorption component is greater than the negative pressure adsorption force inside the second negative pressure adsorption component.

[0011] In a preferred embodiment, the manufacturing method further includes: Pocket material conveying process: The first elastic component continuous body and the pocket continuous sheet are respectively conveyed to the first folding process; First folding process: Wrap the first elastic component continuous body inside the pocket continuous sheet to form a pocket material continuous sheet; First posture transformation process: The continuous sheet of pocket material is cut into individual pocket materials, and the pocket materials are rotated 90° while the distance is changed before being conveyed to the pocket material composite semi-finished product forming process; Surface sheet conveying process: The continuous surface sheet is conveyed to the pocket material composite semi-finished product forming process; a fixed adhesive coating unit is set up to intermittently coat the side of the continuous surface sheet facing the pocket material with pocket adhesive, and the pocket adhesive corresponds to the shape of a "U" for a single absorbent item.

[0012] In a preferred embodiment, the first posture transformation process is arranged with a first conveying device; The first conveying device receives a continuous sheet of pocket material at the first receiving position, cuts it at the first cutting position to form individual pocket materials, and then conveys the pocket materials to the first transfer position after changing the distance while rotating them 90°. In the process of forming a composite semi-finished product of pocket material, a pressure roller is arranged, which is opposite to the first conveying device and is located at the first transfer position; At the first transfer position, the pressure roller rotates 90° while changing the distance of the pocket material and the continuous surface sheet to form a pocket material composite semi-finished product.

[0013] In a preferred embodiment, the expansion unit consists of two pairs of rotatable clamping rollers spaced apart along the CD direction, each pair of clamping rollers being located at one end of the pocket material composite semi-finished product along the CD direction. Each pair of clamping rollers includes a first roller and a second roller arranged at intervals along the MD direction. The first roller and the second roller are respectively located on the upper and lower sides of the pocket material composite semi-finished product along the thickness direction, thereby clamping the pocket material composite semi-finished product.

[0014] In a preferred embodiment, the manufacturing method further includes: Leak-proof material conveying process: A pair of continuous sheets of the leak-proof material spaced in the CD direction are conveyed to the first composite semi-finished product forming process.

[0015] In a preferred embodiment, the manufacturing method further includes: Waistband material conveying process: The second elastic component continuous body and the waist continuous sheet are conveyed to the second folding process respectively; Second folding process: Wrap the second elastic component continuous body inside the waist continuous piece to form an elastic waist continuous piece; Second elastic component cutting process: at least the second elastic component continuous body corresponding to the middle elastic weakening area of ​​the elastic waist continuous piece is cut; The second posture transformation process involves cutting the continuous elastic waistband into individual elastic waistbands, and then conveying the elastic waistbands to the second composite semi-finished product forming process while rotating them 90° and changing their pitch. Liquid-impermeable sheet conveying process: The liquid-impermeable continuous sheet is conveyed to the second composite semi-finished product forming process.

[0016] In a preferred embodiment, the second posture transformation process is arranged with a second conveying device; The second conveying device receives the continuous elastic waistband at the second receiving position, cuts it at the second cutting position to form a single elastic waistband, and then transports the elastic waistband to the second transfer position after changing the distance while rotating it 90°. The second transfer position and the second composite position of the second composite drum are located at the same work station; at the second composite position, the second composite drum rotates 90° while changing the pitch of the elastic waistband and the impermeable continuous sheet to form the second composite semi-finished product.

[0017] In a preferred embodiment, the manufacturing method further includes: Absorber conveying process: conveying the continuous absorber to the absorber cutting process; Absorber cutting process: The continuous absorber is cut into individual absorbers; The second negative pressure adsorption and conveying process involves conveying the absorbent to the overall composite process.

[0018] In a preferred embodiment, the second negative pressure adsorption conveying process is arranged with a second negative pressure adsorption device and a support, the support being located downstream of the second negative pressure adsorption device; The second negative pressure adsorption device transports the absorbent to the overall composite process; The support is used to support the absorbent before it enters the final composite process.

[0019] In a preferred embodiment, the central angle γ of the first composite drum corresponding to the first negative pressure zone ranges from 150° to 270°. The central angle α of the second composite drum corresponding to the second negative pressure zone ranges from 100° to 270°.

[0020] In a preferred embodiment, the line connecting the fourth axis of the second composite drum and the second composite position makes an angle β of 20° to 60° with the vertical direction.

[0021] Another object of the present invention is to provide a manufacturing system for an absorbent article, the manufacturing system being used to perform a method for manufacturing an absorbent article according to the present invention.

[0022] The above-described technical solution of the present invention has at least the following beneficial effects compared with the prior art: This invention provides a method and system for manufacturing absorbent articles. In a first composite semi-finished product forming process, a first composite drum is used to composite a pocket material composite semi-finished product with a pair of leak-proof material continuous sheets at a first composite position to form a first composite semi-finished product. In a second composite semi-finished product forming process, a second composite drum is used to composite an elastic waistband with a liquid-impermeable continuous sheet at a second composite position to form a second composite semi-finished product. In a final composite process, the first composite semi-finished product, the absorbent body, and the second composite semi-finished product are composited at a third composite position where the first and second composite drums are tangent to form a continuous absorbent article. This achieves centralized composite of the pocket material composite semi-finished product with pocket material, the leak-proof material continuous sheet, the elastic waistband, the liquid-impermeable continuous sheet, and the absorbent body through the first and second composite drums in the first, second, and final composite processes. This reduces the shrinkage of the first elastic component of the pocket material and the second elastic component of the elastic waistband, preventing wrinkles in the first and second composite semi-finished products, and thus preventing wrinkles in the final continuous absorbent article.

[0023] This invention provides a method and system for manufacturing absorbent articles. A first composite drum forms a first negative pressure zone inside an arc between a first composite position and a third composite position. A clamping roller is arranged downstream of the third composite position, and the clamping roller is tangent to the second composite drum to form an output position. A second composite drum forms a second negative pressure zone inside an arc between the second composite position and the output position. An expansion process is set upstream of the first composite semi-finished product forming process to expand and flatten the pocket material composite semi-finished product along the CD direction. The first composite semi-finished product is conveyed on the first surface of the first composite drum (the area corresponding to the first negative pressure zone) between the first composite position and the third composite position, thereby reducing the shrinkage of the first elastic component of the pocket material and preventing wrinkles from forming in the first composite semi-finished product. The second composite semi-finished product is conveyed on the second surface of the second composite drum (the area corresponding to the second negative pressure zone) between the second composite position and the third composite position, thereby reducing the shrinkage of the second elastic component of the elastic waistband and preventing wrinkles from forming in the second composite semi-finished product. The absorbent article continuous body is conveyed on the second surface of the second composite drum (the area corresponding to the second negative pressure zone) between the third composite position and the output position to prevent wrinkles from forming in the final absorbent article continuous body.

[0024] This invention provides a method and system for manufacturing absorbent articles. The expansion process includes a first negative pressure adsorption conveying process and an expansion process. The first negative pressure adsorption conveying process conveys the pocket material composite semi-finished product to the expansion process by negative pressure adsorption. The negative pressure adsorption force experienced by the pocket material composite semi-finished product when entering the first negative pressure adsorption conveying process is greater than the negative pressure adsorption force experienced when leaving the first negative pressure adsorption conveying process. This ensures that the pocket material transitions more smoothly and reliably from the pressure roller (first transfer position) to the first negative pressure adsorption device, while ensuring a good composite effect between the pocket material and the continuous surface sheet. This effectively prevents the first elastic component of the pocket material from shrinking and avoids wrinkles in the pocket material composite semi-finished product.

[0025] This invention provides a method and system for manufacturing absorbent articles. By setting a first posture transformation process to perform a 90° rotation of the pocket material while simultaneously performing a variable distance, and by setting a second posture transformation process to perform a 90° rotation of the elastic waistband while simultaneously performing a variable distance, the rotation and variable distance are integrated into the same workstation, achieving efficient and precise configuration of the pocket material and the elastic waistband.

[0026] This invention provides a method and system for manufacturing absorbent articles. In the extended process, the composite semi-finished product of the pocket material is kept flat and wrinkle-free at both ends along the CD direction and is then conveyed to the first composite semi-finished product forming process, thereby effectively preventing the first elastic component of the pocket material from shrinking and preventing wrinkles from forming in the composite semi-finished product of the pocket material.

[0027] This invention provides a method and system for manufacturing absorbent articles. A first negative pressure adsorption conveying process transports a pocket material composite semi-finished product to an expansion process using negative pressure adsorption. The negative pressure adsorption force experienced by the pocket material composite semi-finished product upon entering the first negative pressure adsorption conveying process is greater than the negative pressure adsorption force experienced upon leaving the first negative pressure adsorption conveying process. The expansion process keeps both ends of the pocket material composite semi-finished product flat and wrinkle-free along the CD direction before transporting it to a first composite semi-finished product forming process. This effectively prevents the first elastic component of the pocket material from shrinking, ensuring that the pocket material composite semi-finished product is flatter when entering the first composite position of the first composite process. This, in conjunction with the first composite process, the second composite process, and the final composite process, effectively prevents wrinkles in the first and second composite semi-finished products, thereby preventing wrinkles in the final continuous absorbent article. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of an absorbent article in its unfolded state, produced by a manufacturing method and system for manufacturing an absorbent article according to the present invention.

[0030] Figure 2 yes Figure 1 Cross-sectional view in the SS direction.

[0031] Figure 3 yes Figure 1 Cross-sectional view in the TT direction.

[0032] Figure 4 This is a schematic diagram of the overall process of manufacturing an absorbent article according to the present invention.

[0033] Figure 5 This is a schematic diagram of the structure of the first conveying device, pressure roller, first negative pressure adsorption device, expansion unit and first composite drum of the present invention.

[0034] Figure 6 This is a process flow diagram of the formation of the first composite semi-finished product of the present invention.

[0035] Figure 7 This is a schematic diagram of the structure of the second conveying device and the second composite drum of the present invention.

[0036] Figure 8 This is a process flow diagram of the formation of the second composite semi-finished product of the present invention.

[0037] Figure 9 This is a schematic diagram of the structure of the first composite drum, the second composite drum, the support member, and the clamping roller of the present invention.

[0038] Figure 10 This is a process flow diagram of the formation process of the absorbent article continuum of the present invention.

[0039] Figure 11 yes Figure 6 Cross-sectional view along the AA direction.

[0040] Figure 12 yes Figure 6 Cross-sectional view in the BB direction.

[0041] Figure 13 yes Figure 6 Cross-sectional view in the CC direction.

[0042] Figure 14 yes Figure 6 Cross-sectional view in the DD direction.

[0043] Figure 15 yes Figure 8 Cross-sectional view in the EE direction.

[0044] Figure 16 yes Figure 8 Cross-sectional view in the FF direction.

[0045] Figure 17 This is the book Figure 10 Cross-sectional view in the GG direction.

[0046] Figure 18 This is a schematic diagram of the structure of the expansion unit of the present invention. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0048] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising,” “including,” or “including,” and similar terms mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or “connected,” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0049] It should be noted that the terms "up", "down", "left", "right", "front", and "back" used in this invention are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0050] Combination Figures 1 to 3An absorbent article 20m, in its unfolded state, has mutually orthogonal longitudinal, transverse, and thickness directions. The longitudinal direction corresponds to the length direction of the absorbent article 20m, the transverse direction corresponds to the width direction of the absorbent article 20m, and in the thickness direction, the side in contact with the human body is the skin side, and the side away from the human skin is the non-skin side.

[0051] An absorbent article 20m has a front waist section B1 disposed longitudinally on the abdominal side of the wearer, a back section B2 disposed on the back side of the wearer, and a crotch section B3 disposed between the front waist section B1 and the back section B2.

[0052] like Figure 2 and Figure 3 As shown, an absorbent article 20m includes an absorbent body 3m, the absorbent body 3m having an absorbent core for absorbing bodily fluids and other excretions. Specifically, the absorbent core is an absorbent body formed by mixing fluff pulp fibers and superabsorbent polymer (SAP), or it can be a prefabricated composite core or other known absorbent materials.

[0053] The absorbent article 20m also has a surface sheet 2m located on the skin side along the thickness direction, and a liquid-impermeable sheet 6m located on the non-skin side, with the absorbent body 3m sandwiched between the surface sheet 2m and the liquid-impermeable sheet 6m.

[0054] The absorbent garment 20m also has a pair of leak-proof materials 5m disposed on the skin side of the surface sheet 2m along its thickness direction. The pair of leak-proof materials 5m are disposed laterally spaced on both sides of the surface sheet 2m and extend longitudinally. The leak-proof materials 5m include a water-repellent nonwoven fabric and an elastic component, wherein the elastic component is wrapped inside the water-repellent nonwoven fabric; the elastic component is generally spandex yarn (also known as elastic band). When the absorbent garment 20m is worn, the leak-proof materials 5m stand up towards the wearer's legs under the action of the elastic component to block excretions such as bodily fluids flowing laterally on the absorbent body 3m, thereby preventing side leakage.

[0055] Combination Figure 2 and Figure 3 At least on the back (B2), the absorbent material 20m also has a pocket material 1m. The pocket material 1m is positioned along its thickness between the surface sheet 2m and a pair of leak-proof materials 5m, and overlaps with the absorbent body 3m along its thickness. In this embodiment, the pocket material 1m is only located on the back (B2). In other embodiments, the pocket material 1m is located on both the back (B2) and the front waist (B1).

[0056] Combination Figure 1 , Figure 2 and Figure 3A first elastic component 1am is arranged laterally within the pocket material 1m. The first elastic component 1am is located at one end of the pocket material 1m along the longitudinal direction near the crotch area B3. In this embodiment, the first elastic component 1am is spandex yarn (also known as elastic band). The first elastic component 1am extends laterally and is spaced apart along the longitudinal direction. In other embodiments, the first elastic component 1am can also be a sheet-like elastic film or elastic fabric. Along both sides of the lateral direction, the pocket material 1m has a pocket elastic weakening zone Z1 (corresponding to the two ends of the pocket material 1m in the case of a single absorbent article 20m). The first elastic component 1am of the pocket elastic weakening zone Z1 is cut off, thereby weakening or eliminating the elasticity of the pocket elastic weakening zone Z1.

[0057] Combination Figure 1 and Figure 3 As shown, part of the pocket material 1m is connected to one side of the surface sheet 2m, and the other part is separated from the surface sheet 2m, forming a pocket K between the two. The opening of the pocket K faces the crotch area B3, which is used to prevent bodily fluids and other excretions from spreading along the longitudinal ends of the absorbent material 20m.

[0058] An elastic waistband 4m is provided between the surface sheet 2m and the liquid-impermeable sheet 6m. The elastic waistband 4m is located at the back B2 and is used to provide elasticity to the back B2, increase the effective elastic range of the back B2, and prevent tightness and pressure on the wearer's waist when wearing the garment. Furthermore, the elastic waistband 4m is located between the absorbent body 3m and the liquid-impermeable sheet 6m.

[0059] Combination Figure 1 , Figure 2 and Figure 3 The elastic waistband 4m has a second elastic component 4am arranged laterally within it. In this embodiment, the second elastic component 4am is spandex filament (also known as elastic band). The second elastic component 4am extends laterally and is spaced apart longitudinally. In other embodiments, the second elastic component 4am can also be a sheet-like elastic film or elastic fabric. Along both sides of the elastic waistband 4m, there is a waistband elastic weakening zone Z2. The second elastic component 4am in the waistband elastic weakening zone Z2 is cut off, thereby weakening or eliminating the elasticity of the waistband elastic weakening zone Z2. The portion of the elastic waistband 4m overlapping the absorbent body 3m along its thickness direction has a central elastic weakening zone Z3. The second elastic component 4am in the central elastic weakening zone Z3 is cut off, thereby weakening or eliminating the elasticity of the central elastic weakening zone Z3, thus balancing the fit of the elastic waistband 4m with the structural stability of the absorbent body 3m.

[0060] Combination Figure 1 , Figure 2 and Figure 3On the back B2, left and right waist patches 7m are respectively provided on both sides along the horizontal direction. At the front waist B1, a front waist patch 8m is provided on the non-skin side of the liquid-impermeable sheet 6m. At least a portion of the left and right waist patches 7m is joined between the leak-proof material 5m and the liquid-impermeable sheet 6m, and extends laterally outward from the leak-proof material 5m and the liquid-impermeable sheet 6m. The skin side of the left and right waist patches 7m is provided with hook elements (not shown), which can be detachably attached to the front waist patch 8m, so that the absorbent article 20m has a trouser shape (wearing state) with one waist opening and two leg openings.

[0061] like Figure 1 As shown, at least at the crotch area B3, the absorbent article 20m also has an arc-shaped leg opening 9m, which is recessed from the outer edge of the absorbent article 20m to the inner side laterally, and the leg opening 9m matches the contour of the wearer's leg.

[0062] To manufacture the aforementioned absorbent article 20m, an embodiment of the present invention provides a method for manufacturing the absorbent article. To make the invention clearer, the MD direction and the CD direction are defined. The MD direction is the flow direction of processing the absorbent article 20m. The CD direction is perpendicular to the MD direction. The MD direction corresponds to the longitudinal direction of the absorbent article 20m, and the CD direction corresponds to the transverse direction of the absorbent article 20m.

[0063] Combination Figures 4 to 17 According to an embodiment of the present invention, a method for manufacturing an absorbent article is provided, comprising: Pocket material conveying process S10.

[0064] In the pocket material conveying process S10, the first elastic component continuous body 1a and the pocket continuous sheet 1b are respectively conveyed to the first folding process S11.

[0065] Combination Figure 4 and Figure 6 In the pocket material conveying process S10, a first supply device 10a is arranged. The first supply device 10a is equipped with several free rollers (for conveying flat sheets) and guide rollers (with grooves on the rollers for conveying elastic components), for conveying the first elastic component continuous body 1a (guided by the guide rollers) and the pocket continuous sheet 1b (guided by the free rollers) to the first folding process S11 respectively.

[0066] The first supply device 10a is further provided with an adhesive application unit H, for applying hot melt adhesive to the outer periphery of the first elastic member continuous body 1a and one side of the pocket continuous sheet 1b, respectively. Before entering the first folding process S11, the first elastic member continuous body 1a is bonded to the inner surface of the pocket continuous sheet 1b in a stretched state, such as... Figure 6 As shown.

[0067] First folding process S11.

[0068] The first folding process S11 is located downstream of the pocket material conveying process S10. In the first folding process S11, the first elastic member continuous body 1a is wrapped inside the pocket continuous sheet 1b to form the pocket material continuous sheet 1.

[0069] Combination Figure 4 and Figure 6 In the first folding process S11, a first folding device 11a is set up to wrap the first elastic component continuous body 1a conveyed by the upstream first supply device 10a into the inside of the pocket continuous sheet 1b to form the pocket material continuous sheet 1.

[0070] like Figure 6 As shown, in this embodiment, the first elastic component continuous body 1a is spandex yarn, and several first elastic component continuous bodies 1a extend along the MD direction and are spaced apart along the CD direction. The first folding device 11a folds the pocket continuous sheet 1b along the CD direction along the first folding line 1x and covers the first elastic component continuous body 1a.

[0071] like Figure 6 As shown, in this embodiment, the absorbent article 20m has a pocket material 1m on the back B2, so the first elastic member continuous body 1a is provided only on one side in the CD direction (i.e., unilateral folding is achieved).

[0072] In another embodiment, the absorbent article 20m has pocket material 1m on both the back B2 and the front waist B1. In this case, it is only necessary to increase the size of the pocket continuous sheet 1b along the CD direction. Several first elastic component continuous bodies 1a are provided on both sides of the center line (not shown) of the pocket continuous sheet 1b along the CD direction. When passing through the first folding device 11a, the pocket continuous sheets 1b on both sides along the CD direction are folded along the first folding line 1x and cover the first elastic component continuous bodies 1a (that is, the double sides are folded at the same time).

[0073] First elastic component cutting process S12.

[0074] The first elastic component cutting process S12 is located downstream of the first folding process S11. The first elastic component cutting process S12 cuts the first elastic component continuous body 1a of the pocket material continuous sheet 1 corresponding to the pocket elastic weakening region Z1.

[0075] Combination Figure 4 and Figure 6In the first elastic component cutting process S12, a first elastic cutting device 11c is provided to cut the first elastic component continuous body 1a corresponding to the pocket elastic weakening zone Z1 of the pocket material continuous sheet 1, so that the elasticity of the first elastic component continuous body 1a in the pocket elastic weakening zone Z1 corresponding to the absorbent article 20m is weakened or eliminated, such as... Figure 6 As shown.

[0076] Specifically, the first elastic cutting device 11c cuts the first elastic component continuous body 1a of the pocket material continuous sheet 1 along the first cutting area 1p, causing the elasticity of the first elastic component continuous body 1a to disappear in the pocket elasticity weakening area Z1 corresponding to the absorbent article 20m, such as... Figure 6 As shown. The first elastic component 1am is formed by cutting the first elastic component continuous 1a.

[0077] In the first elastic component cutting process S12, the first elastic component continuous body 1a of the pocket material continuous sheet 1 corresponding to the pocket elastic weakening region Z1 is cut. In this case, the first conveying device 110 (described below) in the first posture change process S13 on the downstream side only needs to cut the pocket continuous sheet 1b. Therefore, the first conveying device 110 does not need to be provided with an anvil (which abuts against the first cutting member 11f and cooperates with the first cutting member 11f to cut), thereby simplifying the structure of the first conveying device 110. In this case, by cutting the first elastic component continuous body 1a first and then cutting the pocket continuous sheet 1b in a step-by-step cutting method, it is suitable for high-speed operation of the equipment and the cutting effect is better.

[0078] In other embodiments, the first elastic component cutting process S12 may be omitted. In this case, the first conveying device 110 in the downstream first posture transformation process S13 needs to cut the first elastic component continuous body 1a and the pocket continuous piece 1b at the same time. Therefore, the first conveying device 110 needs to be equipped with an anvil.

[0079] First posture change process S13.

[0080] The first posture transformation process S13 is located downstream of the first elastic component cutting process S12. In the first posture transformation process S13, the continuous piece of pocket material 1 is cut into individual pocket materials 1m, and the pocket materials 1m are rotated 90° while the distance is changed before being conveyed to the pocket material composite semi-finished product forming process S0.

[0081] Combination Figure 4 , Figure 5 and Figure 6 In the first posture transformation process S13, the first conveying device 110 is arranged. The first conveying device 110 includes a first steering and adjusting device 11e and a first cutting component 11f.

[0082] The first steering pitch adjustment device 11e is provided with a plurality of first retaining pads 11en in the circumferential direction. The first steering pitch adjustment device 11e revolves around the first axis 01 and rotates in a first direction a (e.g., Figure 5 The first retaining pad 11en moves at a variable speed (in the direction indicated by arrow a) around the first axis O1 in a first rotational direction a. Simultaneously, the first retaining pad 11en moves at a variable speed around the radially extending rotational axis center in a second rotational direction b (as shown by arrow a). Figure 5 Make a 90° turn (in the direction indicated by the middle arrow b).

[0083] That is, the first retaining pad 11en moves at a different speed around the first axis 01 in a first rotational direction a, while turning 90° around the center of the radially extending rotational axis in a second rotational direction b.

[0084] The surface of the first retaining pad 11en has multiple adsorption holes (not shown in the figure). The inside of the first retaining pad 11en is connected to an external negative pressure device (such as a negative pressure fan, vacuum generator, etc.), so that the adsorption holes are connected to the negative pressure inside the first retaining pad 11en. Under the action of the negative pressure device, the continuous pocket material 1 and the individual pocket material 1m formed after being cut are adsorbed by the multiple adsorption holes on the surface of the first retaining pad 11en and transported. The negative pressure value inside the first retaining pad 11en ranges from -10 kPa to -30 kPa.

[0085] like Figure 5 As shown, the first steering pitch adjustment device 11e has a first receiving position R1, a first cutting position N1, and a first transfer position R2. The first cutting position N1 is located downstream of the first receiving position R1, and the first transfer position R2 is located downstream of the first cutting position N1.

[0086] The first cutting element 11f is disposed on one side of the first steering adjustment device 11e in the radial circumferential direction, and is located at the first cutting position N1. The first cutting element 11f is provided with a cutter (not shown in the figure). The two adjacent first retaining pads 11en at the first cutting position N1 are closest to each other.

[0087] The first conveying device 110 receives the continuous sheet of pocket material 1 at the first receiving position R1, and cuts it at the first cutting position N1 to form individual pocket materials 1m. The individual pocket materials 1m are then rotated 90° and the distance is changed before being conveyed to the first transfer position R2. The pocket materials 1m after the 90° rotation and distance change are combined with the surface continuous sheet 2 (hereinafter) at the first transfer position R2.

[0088] In this embodiment, the first elastic component continuous body 1a corresponding to the pocket elastic weakening region Z1 in the pocket material continuous sheet 1 has been cut in the first elastic component cutting process S12, and the first conveying device 110 only needs to cut the pocket continuous sheet 1b in the pocket material continuous sheet 1.

[0089] Specifically, the continuous sheet of pocket material 1 conveyed upstream enters the first conveying device 110. Using the first cutting element 11f, the continuous sheet of pocket material 1b (where the first elastic component continuous body 1a has been cut in the corresponding pocket elastic weakening region Z1) is cut along the second cutting line 1q to form a single piece of pocket material 1m. Figure 6 and Figure 11 As shown.

[0090] It should be noted that in this embodiment, since the first elastic component cutting process S12 has already cut the first elastic component continuous body 1a corresponding to the pocket elastic weakening region Z1 of the pocket material continuous sheet 1, the first posture transformation process S13 only needs to cut the pocket continuous sheet 1b. Therefore, there is no need to set an anvil between the two first holding pads 11en adjacent to the first cutting position N1. In this embodiment, preferably, the cutter of the first cutting member 11f is set as a serrated structure with the blade tip and blade valley spaced apart. Cutting is achieved by inserting the serrated blade tip into the pocket continuous sheet 1b, which effectively ensures that the pocket continuous sheet 1b can be 100% cut during the high-speed operation of the production of absorbent articles.

[0091] In other embodiments, an anvil may also be provided between two adjacent first retaining pads 11en, for example, in the case where the first elastic member cutting process S12 is not provided (the first elastic cutting device 11c is not provided). When an anvil is provided, the first cutting member 11f does not need to be provided with a serrated blade; a conventional blade (such as a rectangular blade) is sufficient.

[0092] like Figure 4 and Figure 5 As shown, a first feeding device 11d is further provided on the upstream side of the first conveying device 110. In this embodiment, the first feeding device 11d is a conveyor belt structure with negative pressure adsorption, thereby providing stable conveying (i.e., conveying under adsorption) of the continuous sheet 1 of pocket material before entering the first conveying device 110.

[0093] like Figure 4 and Figure 5 As shown, the continuous sheet of pocket material 1 is fed to the first feeding device 11d via the free roller D. The first feeding device 11d, while the continuous sheet of pocket material 1a is cut from the first elastic component, conveys it to the first posture transformation process S13 and into the first conveying device 110 in an adsorption state. At the first receiving position R1, the first holding pad 11en sequentially receives the continuous sheet of pocket material 1, causing the continuous sheet of pocket material 1b in the continuous sheet of pocket material 1 to be cut at the first cutting position N1, forming a single piece of pocket material 1m, as shown. Figure 6 As shown.

[0094] The pocket material 1m is attracted by the first retaining pad 11en. The first retaining pad 11en carries the pocket material 1m and moves around the first axis 01 in a first rotation direction a with varying speed (the distance between adjacent first retaining pads 11en gradually increases), while gradually turning 90° around the center of the radially extending rotation axis in a second rotation direction b.

[0095] At the first handover position R2, the first retaining pad 11en completes a 90° turn while simultaneously changing its pitch, thereby changing the pocket material 1m from the MD direction to the CD direction, as shown below. Figure 6 As shown and Figure 11 As shown.

[0096] Then the first retaining pad 11en moves at a variable speed along the first rotation direction a, so that the two adjacent first retaining pads 11en gradually approach each other; at the same time, the first retaining pad 11en moves along the second rotation direction b, so that the first retaining pad 11en turns 90° again and returns to the first receiving position R1 to receive the next transport of pocket material 1m.

[0097] Surface sheet conveying process S20 In the surface sheet conveying process S20, the continuous surface sheet 2 is conveyed to the pocket material composite semi-finished product forming process S0.

[0098] The surface sheet conveying process S20 is equipped with several free rollers to convey the continuous surface sheet 2 to the pocket material composite semi-finished product forming process S0.

[0099] In the surface sheet conveying process S20, a fixed adhesive coating unit H1 is set up to intermittently apply pocket adhesive G1 to the side of the continuous surface sheet 2 facing the pocket material 1m. The pocket adhesive G1 is shaped like a "U" corresponding to a single absorbent item 20m; that is, the pocket adhesive G1 is intermittently applied to the surface of the continuous surface sheet 2 at a specified length, and the pocket adhesive G1 is shaped like a "U". Figure 6 As shown.

[0100] This invention applies pocket adhesive G1 to one side of the continuous surface sheet 2, compared to applying pocket adhesive G1 to one side of the pocket material 1m. Since the pocket material 1m is adsorbed onto the first retaining pad 11en during transport, the impact of hot-melt adhesive seepage on the first retaining pad 11en is reduced, thereby improving the service life of the first retaining pad 11en. Furthermore, the fixing adhesive coating unit H1 in the surface sheet conveying process S20 is closer to the pocket material composite semi-finished product forming process S0 (shorter cooling time), making it less likely for the pocket adhesive G1 to cure before entering the pocket material composite semi-finished product forming process S0. Therefore, in the pocket material composite semi-finished product forming process S0, the continuous surface sheet 2 and the pocket material 1m have a better composite effect, and interlayer delamination is less likely to occur.

[0101] If pocket adhesive G1 is applied to one side of the pocket material 1m, since the fixing adhesive application unit H1 is generally located upstream of the first conveying device 110, the distance between the fixing adhesive application unit H1 and the pocket material composite semi-finished product forming process S0 is relatively large (longer cooling time). The pocket adhesive G1 is likely to solidify or partially solidify before entering the pocket material composite semi-finished product forming process S0, thus affecting the composite effect between the surface continuous sheet 2 and the pocket material 1m. Moreover, the pocket adhesive G1 applied to the pocket material 1m is prone to seepage (also called glue seepage), contaminating the first retaining pad 11en, which requires real-time cleaning. Incomplete cleaning will also increase the replacement frequency and reduce the service life of the first retaining pad 11en.

[0102] S0 is the process for forming a composite semi-finished product of pocket material.

[0103] The pocket material composite semi-finished product forming process S0 is located downstream of the first posture change process S13 and the surface sheet conveying process S20. In the pocket material composite semi-finished product forming process S0, pocket material 1m is composited with the continuous surface sheet 2 to form the pocket material composite semi-finished product PO.

[0104] Combination Figure 4 , Figure 5 , Figure 6 and Figure 12 In the process S0 of forming a composite semi-finished product of pocket material, a pressure roller 12a is arranged. The pressure roller 12a is arranged opposite to the first conveying device 110 and is located at the first transfer position R2.

[0105] While the first retaining pad 11en rotates the pocket material 1m by 90° and changes its pitch, it is conveyed to the first transfer position R2. At the first transfer position R2, the surface continuous sheet 2 is located between the pocket material 1m and the pressure roller 12a. At the first transfer position R2, the pressure roller 12a combines the pocket material 1m, which has undergone a 90° rotation and pitch change, with the surface continuous sheet 2 to form a pocket material composite semi-finished product PO.

[0106] The outer periphery of the pressure roller 12a is provided with an elastic buffer layer, which can be made of materials such as sponge, foamed rubber, foam, EVA, latex, and fiber cotton. By setting the elastic buffer layer, the impact of the first retaining pad 11en when it is transferred at the first transfer position R2 can be reduced, and the life of the first retaining pad 11en can be increased. At the same time, when the first conveying device 110 has different sizes, the impact of speed difference on the process can be reduced.

[0107] It should be noted that, in a preferred embodiment of the present invention, the pocket adhesive G1 is coated on the surface of the continuous surface sheet 2, as described above. In another embodiment, the pocket adhesive G1 may also be coated on one side of the pocket material 1m. The coating of the pocket adhesive G1 is not particularly limited, and the pocket adhesive G1 may be coated on both the opposing surfaces of the continuous surface sheet 2 and the pocket material 1m.

[0108] Widening process S21.

[0109] The expansion process S21 is located downstream of the pocket material composite semi-finished product forming process S0 and upstream of the first composite semi-finished product forming process S1. It is used to expand and flatten the pocket material composite semi-finished product PO along the CD direction.

[0110] Combination Figure 4 and Figure 5 The expansion process S21 includes a first negative pressure adsorption and conveying process S211 and an expansion process S212.

[0111] First negative pressure adsorption and conveying process S211.

[0112] The first negative pressure adsorption and conveying process S211 is located downstream of the pocket material composite semi-finished product forming process S0. The first negative pressure adsorption and conveying process S211 conveys the pocket material composite semi-finished product PO to the extension process S212 by means of negative pressure adsorption.

[0113] Combination Figure 4 and Figure 5 According to an embodiment of the present invention, the negative pressure adsorption force received by the pocket material composite semi-finished product PO when entering the first negative pressure adsorption and conveying process S211 is greater than the negative pressure adsorption force received by the pocket material composite semi-finished product PO when leaving the first negative pressure adsorption and conveying process S211.

[0114] Combination Figure 4 and Figure 5 In the first negative pressure adsorption and conveying process S211, a first negative pressure adsorption device 12b is arranged. The first negative pressure adsorption device 12b conveys the pocket material composite semi-finished product PO to the extension process S212 by means of negative pressure adsorption.

[0115] The first negative pressure adsorption device 12b is a conveyor belt structure with negative pressure adsorption. It has a negative pressure zone, which is connected to an external adsorption device (such as a negative pressure fan, vacuum generator, etc.) to adsorb and hold the semi-finished bag material composite product P0, preventing the semi-finished bag material composite product P0 from shrinking back in the CD direction and improving the composite effect of the bag material 1m. In another embodiment, the first negative pressure adsorption device 12b can also be a pair of opposing conveyor belt structures, that is, it includes a pair of oppositely arranged conveyor belt structures, at least one of which has a negative pressure zone. The semi-finished bag material composite product P0 is sandwiched between the pair of oppositely arranged conveyor belt structures for conveying.

[0116] Furthermore, the first negative pressure adsorption device 12b includes a first negative pressure adsorption component C1 and a second negative pressure adsorption component C2, as well as a conveyor belt C3 that is annularly wound around the outside of the first negative pressure adsorption component C1 and the second negative pressure adsorption component C2. The first negative pressure adsorption component C1 is arranged upstream of the second negative pressure adsorption component C2, and the second negative pressure adsorption component C2 has an arc-shaped structure at one end near the first negative pressure adsorption component C1, thereby changing the conveying path of the pocket material composite semi-finished product P0.

[0117] In this embodiment, by providing an arc-shaped structure at one end of the first negative pressure adsorption component C1, the conveying path of the pocket material composite semi-finished product P0 changes by 90°, specifically, from vertical to horizontal. In other embodiments, the conveying path of the pocket material composite semi-finished product P0 may also be a change other than 90°.

[0118] Conveyor belt C3 is arranged in a ring around the outer periphery of multiple rollers (one of which is a drive roller). The first negative pressure adsorption component C1 and the second negative pressure adsorption component C2 are located inside the conveyor belt C3, that is, the conveyor belt C3 is arranged in a ring around the outside of the first negative pressure adsorption component C1 and the second negative pressure adsorption component C2. Since the end of the second negative pressure adsorption component C2 near the first negative pressure adsorption component C1 is arc-shaped, the part of the conveyor belt C3 that is arranged in a ring around the outside of the first negative pressure adsorption component C1 and the second negative pressure adsorption component C2 is curved. That is, the pocket material composite semi-finished product PO is conveyed by the conveyor belt C3 along the curved arc-shaped conveying path in the first negative pressure adsorption conveying process S211. The conveyor belt C3 conveys the product through the curved arc-shaped conveying path, so that the conveying path of the pocket material composite semi-finished product P0 changes by 90°, folding the original horizontal linear space into a three-dimensional arc-shaped space. This makes full use of the vertical height space of the equipment, eliminating the need to reserve an excessively long horizontal station for straight conveying, directly reducing the floor area of ​​the equipment, and making the overall spatial layout of the equipment more compact and miniaturized.

[0119] The negative pressure adsorption force inside the first negative pressure adsorption component C1 is greater than the negative pressure adsorption force inside the second negative pressure adsorption component C2. This results in the negative pressure adsorption force experienced by the semi-finished product PO of the pocket material entering the first negative pressure adsorption conveying process S211 being greater than the negative pressure adsorption force experienced by the semi-finished product PO of the pocket material entering the first negative pressure adsorption conveying process S211. This ensures that the pocket material 1m transitions more smoothly and reliably from the pressure roller 12a (first transfer position R2) to the first negative pressure adsorption device 12b, while also ensuring a good composite effect between the pocket material 1m and the continuous surface sheet 2.

[0120] In addition, the negative pressure adsorption force inside the first negative pressure adsorption component C1 is less than the negative pressure adsorption force inside the first retaining pad 11en. This is because the first retaining pad 11en is mainly used to change the pitch while turning the pocket material 1m at 90°, combining two motion modes: circumferential motion and its own radial motion. In order to prevent the pocket material 1m from shrinking back along the CD direction, the first retaining pad 11en needs to have a large negative pressure adsorption force. However, after the pocket material 1m and the surface sheet continuous sheet S20 are composited in the pocket material composite semi-finished product forming process S0, a large negative pressure adsorption force is not required during the conveying process on the first negative pressure adsorption device 12b.

[0121] Preferably, the negative pressure value range of the negative pressure zone corresponding to the first negative pressure adsorption component C1 is -5 to -10 kPa, and the negative pressure value range of the negative pressure zone corresponding to the second negative pressure adsorption component C2 is -2 to -6 kPa.

[0122] Extended process S212.

[0123] The extension process S212 is located downstream of the first negative pressure adsorption and conveying process S211. In the extension process S212, tension is applied to both ends of the pocket material composite semi-finished product P0 along the CD direction to keep the pocket material composite semi-finished product P0 flat and wrinkle-free, and then it is conveyed to the first composite semi-finished product forming process S1.

[0124] Combination Figure 4 and Figure 5 In the expansion process S212, the expansion unit 12d is arranged. The expansion unit 12d is located between the first negative pressure adsorption device 12b and the first composite drum 12c (described in detail below). It is used to apply tension to both ends of the pocket material composite semi-finished product P0 along the CD direction, so that the pocket material composite semi-finished product P0 is kept flat and wrinkle-free, and is conveyed to the first composite semi-finished product forming process S1, thereby reducing wrinkles in the pocket material composite semi-finished product P0, thereby expanding the pocket material composite semi-finished product P0 in the CD direction, effectively preventing the pocket material composite semi-finished product P0 from shrinking along the CD direction under the action of the first elastic member 1am.

[0125] In some embodiments, such as Figure 18The expansion unit 12d consists of two pairs of rotatable clamping rollers 121 spaced apart along the CD direction, with each pair of clamping rollers 121 located at one end of the pocket material composite semi-finished product P0 in the CD direction.

[0126] Each pair of clamping rollers 121 includes a first roller 121a and a second roller 121b arranged at intervals along the MD direction. The first roller 121a and the second roller 121b are located on the upper and lower sides of the pocket material composite semi-finished product P0 along the thickness direction, respectively, thereby clamping the pocket material composite semi-finished product P0. The two pairs of clamping rollers 121 cooperate with each other to clamp and expand the two ends of the pocket material composite semi-finished product P0 in the CD direction.

[0127] Leak-proof material conveying process S50.

[0128] like Figure 4 , Figure 6 and Figure 13 As shown, in the leak-proof material conveying process S50, a pair of leak-proof material continuous sheets 5 spaced apart in the CD direction are conveyed to the first composite semi-finished product forming process S1.

[0129] A pair of leak-proof material continuous sheets 5 can be formed by wrapping elastic components inside a non-woven fabric. The elastic components can be elastic materials such as elastic threads (e.g., spandex filaments), elastic strips, or elastic films. The pair of leak-proof material continuous sheets 5 are spaced apart along the CD direction and conveyed in an elongated state along the MD direction to the first composite semi-finished product forming process S1.

[0130] The leak-proof material conveying process S50 is equipped with an adhesive application unit H, which is used to apply hot melt adhesive to one side of a pair of leak-proof material continuous sheets 5.

[0131] Waistband material conveying process S40.

[0132] In the waist material conveying process S40, the second elastic component continuous body 4a and the waist continuous piece 4b are respectively conveyed to the second folding process S41.

[0133] Combination Figure 4 and Figure 8 In the waist material conveying process S40, a second supply device 140a is arranged. The second supply device 140a is equipped with several free rollers (for conveying flat sheets) and guide rollers (with grooves on the rollers for conveying elastic components), which are used to convey the second elastic component continuous body 4a (guided by the guide rollers) and the waist continuous sheet 4b (guided by the free rollers) to the second folding process S41 respectively.

[0134] The second supply device 140a is further provided with an adhesive application unit H for applying hot melt adhesive to the outer periphery of the second elastic member continuous 4a and one side of the waist continuous sheet 4b. Before entering the second folding process S41, the second elastic member continuous 4a is bonded to the inner surface of the waist continuous sheet 4b in a stretched state, such as... Figure 8 As shown.

[0135] Second folding process S41.

[0136] The second folding process S41 is located downstream of the waist material conveying process S40. In the second folding process S41, the second elastic component continuous body 4a is wrapped inside the waist continuous piece 4b to form the elastic waist continuous piece 4.

[0137] Combination Figure 4 and Figure 8 In the second folding process S41, a second folding device 14a is provided to wrap the second elastic component continuous body 4a conveyed by the upstream second supply device 140a into the interior of the waist continuous piece 4b to form an elastic waist continuous piece 4.

[0138] like Figure 8 As shown, in this embodiment, the second elastic component continuous body 4a is spandex yarn, and several second elastic component continuous bodies 4a extend along the MD direction and are spaced apart along the CD direction. The second folding device 14a folds one side of the waist continuous piece 4b along the CD direction along the second folding line 4x and covers the second elastic component continuous body 4a.

[0139] In the preparation process, the elastic elongation rate of the continuous elastic waistband 4 is 1 to 1.5 times that of the continuous elastic pocket material 1. In the prepared absorbent item 20m, the elastic waistband 4m has a greater stretching stress in the lateral direction than the stretching stress in the lateral direction of the pocket material 1m, which ensures that the back B2 has better elasticity, improves the wrapping force and wearing comfort.

[0140] Second elastic component cutting process S42.

[0141] The second elastic component cutting process S42 is located downstream of the second folding process S41. The second elastic component cutting process S42 cuts at least the second elastic component continuous body 4a corresponding to the middle elastic weakening zone Z3 of the elastic waist continuous piece 4.

[0142] Combination Figure 4 and Figure 8 In the first elastic component cutting process S12, a second elastic cutting device 14c and a third elastic cutting device 14d are provided.

[0143] The second elastic cutting device 14c is used to cut the second elastic component continuous body 4a in the middle elastic weakening zone Z3 of the elastic waistband continuous sheet 4 (corresponding to the middle position of the elastic waistband continuous sheet 4 in the case of a single absorbent article 20m), so that the elasticity of the second elastic component continuous body 4a in the middle elastic weakening zone Z3 corresponding to the absorbent article 20m is weakened or disappears, such as... Figure 8 As shown.

[0144] The third elastic cutting device 14d is used to cut the second elastic component continuous body 4a of the elastic waistband continuous sheet 4 in the waistband elastic weakening zone Z2 (corresponding to the two ends of the elastic waistband continuous sheet 4 in the case of a single absorbent article 20m), so that the elasticity of the second elastic component continuous body 4a in the waistband elastic weakening zone Z2 corresponding to the absorbent article 20m is weakened or disappears, such as Figure 8 As shown.

[0145] Specifically, the third elastic cutting device 14d cuts the second elastic component continuous body 4a of the elastic waistband continuous piece 4 along the third cutting zone 4q, causing the elasticity of the second elastic component continuous body 4a to disappear in the waistband elasticity weakening zone Z2 corresponding to the absorbent article 20m, such as... Figure 8 As shown. The second elastic component 4am is formed by cutting the second elastic component continuous 4a.

[0146] In another embodiment, the second elastic component cutting process S42 may also be provided with only one elastic cutting device, that is, the stations of the second elastic cutting device 14c and the third elastic cutting device 14d are both set on one elastic cutting device. Through one elastic cutting device, both the second elastic component continuous body 4a in the middle elastic weakening zone Z3 and the second elastic component continuous body 4a in the waist elastic weakening zone Z2 are cut.

[0147] In the second elastic component cutting process S42, the second elastic component continuous body 4a of the waist elasticity weakening zone Z2 of the elastic waist continuous piece 4 is cut off. In this case, the second conveying device 140 (described below) in the second posture change process S43 on the downstream side only needs to cut the waist continuous piece 4b. Therefore, the second conveying device 140 does not need to be provided with an anvil (which abuts against the second cutting piece 14g and cooperates with the second cutting piece 14g to cut), thereby simplifying the structure of the second conveying device 140 and adapting it to high-speed production.

[0148] In other embodiments, the second elastic component cutting process S42 may also only use the second elastic cutting device 14c (i.e., only one elastic cutting device) to cut the second elastic component continuous body 4a in the middle elastic weakening zone Z3 of the elastic waist continuous piece 4, so that the elasticity of the second elastic component continuous body 4a in the middle elastic weakening zone Z3 of the corresponding absorbent article 20m is weakened or disappears. At this time, the second conveying device 140 in the downstream second posture transformation process S43 needs to simultaneously cut the second elastic component continuous body 4a and the waist continuous piece 4b corresponding to the waist elastic weakening zone Z2, so the second conveying device 140 needs to be equipped with an anvil.

[0149] Second posture change process S43.

[0150] The second posture transformation process S43 is located downstream of the second elastic component cutting process S42. In the second posture transformation process S43, the continuous elastic waistband 4 is cut into individual elastic waistbands 4m, and the elastic waistbands 4m are rotated 90° while the pitch is changed before being conveyed to the second composite semi-finished product forming process S2.

[0151] Combination Figure 4 , Figure 7 and Figure 8 In the second posture change process S43, the second conveying device 140 is arranged. The second conveying device 140 includes a second steering and adjusting device 14f and a second cutting piece 14g.

[0152] The second steering pitch adjustment device 14f is provided with multiple second retaining pads 14fn in the circumferential direction. The second steering pitch adjustment device 14f revolves around the second axis O2 and rotates in a third direction c (e.g., Figure 7 The second retaining pad 14fn moves at a variable speed (in the direction indicated by the middle arrow c), causing it to rotate around the second axis 02 in a third rotational direction c in the circumferential direction. Simultaneously, the second retaining pad 14fn rotates around the radially extending rotation axis center in a fourth rotational direction d (as shown by the arrow c). Figure 7 Make a 90° turn (in the direction indicated by the middle arrow d).

[0153] That is, the second retaining pad 14fn moves at a different speed around the second axis 02 in a third rotational direction c, while turning 90° around the center of the radially extending rotational axis in a fourth rotational direction d.

[0154] like Figure 7 As shown, the second steering pitch adjustment device 14f has a second receiving position R3, a second cutting position N2, and a second transfer position R4. The second cutting position N2 is located downstream of the second receiving position R3, and the second transfer position R4 is located downstream of the second cutting position N2.

[0155] The second cutting element 14g is disposed on one side of the second steering adjustment device 14f along the radial circumference direction, and is located at the second cutting position N2. The second cutting element 14g is provided with a cutter (not shown in the figure). The two adjacent second retaining pads 14fn at the second cutting position N2 are closest to each other.

[0156] The second conveying device 140 receives the elastic waistband continuous sheet 4 at the second receiving position R3, cuts it at the second cutting position N2 to form individual elastic waistbands 4m, and then conveys the individual elastic waistbands 4m to the second transfer position R4 after changing the pitch while rotating them 90°. The elastic waistbands 4m after changing the pitch while rotating 90° are combined with the liquid-impermeable continuous sheet 6 (hereinafter) at the second transfer position R4.

[0157] In this embodiment, since the second elastic component continuous body 4a corresponding to the waist elastic weakening area Z2 of the elastic waist continuous piece 4 has been cut in the second elastic component cutting process S42, the second conveying device 140 only needs to cut the waist continuous piece 4b in the elastic waist continuous piece 4.

[0158] Specifically, the elastic waistband continuous sheet 4 conveyed from the upstream side enters the second conveying device 140. Using the second cutting element 14g, the waist section continuous sheet 4b (the second elastic component continuous body 4a has been cut in the corresponding waistband elastic weakening zone Z2) of the elastic waistband continuous sheet 4 is cut along the fourth cutting line 4e to form a single elastic waistband 4m. Figure 8 and Figure 15 As shown.

[0159] It should be noted that in this embodiment, since the second elastic component cutting process S42 has already cut the second elastic component continuous body 4a corresponding to the waist elastic weakening area Z2 of the elastic waist continuous piece 4, the second posture transformation process S43 only needs to cut the waist continuous piece 4b. Therefore, there is no need to set an anvil between the two adjacent second holding pads 14fn at the second cutting position N2. In this embodiment, the structure is the same as that of the first cutting member 11f. Preferably, the cutter of the second cutting member 14g is set as a serrated structure with the blade tip and blade valley spaced apart. Cutting is achieved by inserting the serrated blade tip into the waist continuous piece 4b, which effectively ensures that the waist continuous piece 4b can be 100% cut during the high-speed operation of the production of absorbent articles.

[0160] In other embodiments, an anvil may also be provided between two adjacent second retaining pads 14fn. For example, if the third elastic cutting device 14d is not provided in the second elastic component cutting process S42, that is, if the second elastic component cutting process S42 does not cut the second elastic component continuous body 4a corresponding to the waist elastic weakening region Z2, an anvil needs to be provided between two adjacent second retaining pads 14fn. When an anvil is provided, the second cutting piece 14g does not need to be provided with a serrated blade; only a conventional blade (such as a rectangular blade) is required.

[0161] like Figure 4 and Figure 7 As shown, a second feeding device 14e is further provided on the upstream side of the second conveying device 140. In this embodiment, the second feeding device 14e is a conveyor belt structure with negative pressure adsorption. The second feeding device 14e has a similar structure and function to the first feeding device 11d, and will not be described in detail here.

[0162] like Figure 4 and Figure 7 As shown, the elastic waistband continuous sheet 4 is fed to the second feeding device 14e via a free roller. The second feeding device 14e, while the second elastic component continuous body 4a is cut, conveys the elastic waistband continuous sheet 4 to the second posture transformation process S43 in an adsorption state, and then into the second conveying device 140. At the second receiving position R3, the second holding pad 14fn sequentially receives the elastic waistband continuous sheet 4, causing the waist continuous sheet 4b of the elastic waistband continuous sheet 4 to be cut at the second cutting position N2, forming a single elastic waistband 4m, as shown. Figure 8 As shown.

[0163] The elastic waistband 4m is attracted by the second retaining pad 14fn. The second retaining pad 14fn carries the elastic waistband 4m while moving around the second axis 02 in the third rotation direction c (the distance between adjacent second retaining pads 14fn gradually increases), and while gradually turning 90° around the center of the radially extending rotation axis in the fourth rotation direction d.

[0164] At the second handover position R4, the second retaining pad 14fn completes a 90° turn while simultaneously changing pitch, thereby changing the elastic waist circumference 4m from the MD direction to the CD direction, as shown below. Figure 8 and Figure 15 As shown.

[0165] Then the second retaining pad 14fn moves at a variable speed along the third rotation direction c, so that the two adjacent second retaining pads 14fn gradually approach each other; at the same time, the second retaining pad 14fn moves along the fourth rotation direction d, so that the second retaining pad 14fn turns 90° again and returns to the second receiving position R3 to receive the next transport of the elastic waist circumference 4m.

[0166] Liquid-impermeable sheet conveying process S60.

[0167] In the liquid-impermeable sheet conveying process S60, the liquid-impermeable continuous sheet 6 is conveyed to the second composite semi-finished product forming process S2.

[0168] like Figure 4 and Figure 7 As shown, in the impermeable sheet conveying process S60, an adhesive application unit H is provided for applying hot melt adhesive to one side of the impermeable continuous sheet 6. In some embodiments, in the second posture changing process S43, an adhesive application unit H is provided for applying hot melt adhesive to one side of the elastic waistband continuous sheet 4 or the elastic waistband 4m.

[0169] Absorber conveying process S30.

[0170] like Figure 4 As shown, in the absorber conveying process S30, the absorber continuous 3 is conveyed to the absorber cutting process S31.

[0171] Absorber cutting process S31.

[0172] The absorbent cutting process S31 is located downstream of the absorbent conveying process S30. The absorbent cutting process S31 cuts the continuous absorbent 3 into individual absorbents 3m.

[0173] like Figure 4 and Figure 10 As shown, the absorbent cutting process S31 is provided with an absorbent cutting device 13a, which is equipped with a cutter (not shown in the figure). The cutter cuts the absorbent continuum 3 along the fifth cutting line 3p into individual absorbents 3m.

[0174] The second negative pressure adsorption and conveying process S32.

[0175] The second negative pressure adsorption and conveying process S32 is located downstream of the absorbent cutting process S31. The second negative pressure adsorption and conveying process S32 conveys the absorbent 3m to the overall compounding process S3.

[0176] like Figure 4 and Figure 9 As shown, the second negative pressure adsorption conveying process S32 includes a second negative pressure adsorption device 13b and a support 13c. The second negative pressure adsorption device 13b is a conveyor belt structure with negative pressure adsorption. The second negative pressure adsorption device 13b conveys the absorbent 3m to the overall compounding process S3 by negative pressure adsorption.

[0177] The support 13c is located downstream of the second negative pressure adsorption device 13b. The support 13c is used to support the absorbent 3m before it enters the overall compounding process S3.

[0178] The support 13c provided downstream of the second negative pressure adsorption device 13b, since it has now formed a separate absorbent 3m (a non-continuous body), can effectively prevent the absorbent 3m from sagging during the conveying process, avoid problems such as folding, and ensure that the absorbent 3m is conveyed to the total composite process S3 in a flat state, thus guaranteeing the composite effect.

[0179] The first composite semi-finished product forming process S1.

[0180] The first composite semi-finished product forming process S1 is located downstream of the expansion process S212 and the leak-proof material conveying process S50. In the first composite semi-finished product forming process S1, the pocket material composite semi-finished product P0 is combined with a pair of leak-proof material continuous sheets 5 to form the first composite semi-finished product P1.

[0181] like Figure 4 , Figure 6 , Figure 9 and Figure 14 As shown, in the first composite semi-finished product forming process S1, a first composite drum 12c is arranged, and the first composite drum 12c includes a first composite position F1.

[0182] At the first composite position F1, a pair of leak-proof material continuous sheets 5 are located between the pocket material composite semi-finished product P0 and the first composite drum 12c, so that the pocket material 1m is located between the leak-proof material continuous sheets 5 and the surface continuous sheets 2. The first composite drum 12c, at the first composite position F1, combines the pocket material composite semi-finished product P0 with the pair of leak-proof material continuous sheets 5 to form the first composite semi-finished product P1. The structure of the first composite drum 12c is described in detail below.

[0183] Combination Figure 4 and Figure 5 According to an embodiment of the present invention, as described above, the first conveying device 110 has a first steering adjustment device 11e, and the horizontal distance W between the first axis O1 of the first steering adjustment device 11e and the third axis O4 of the first composite drum 12c is less than 2 meters.

[0184] In this invention, the horizontal distance W between the first axis O1 of the first steering adjustment device 11e and the third axis O4 of the first composite drum 12c is less than 2 meters. Combined with the arc-shaped conveyor belt C3 structure of the first negative pressure adsorption device 12b, the semi-finished composite product PO of the pocket material is conveyed along the arc-shaped conveyor belt C3 in the first negative pressure adsorption conveying process S211, which shortens the path of the semi-finished composite product PO of the pocket material to the first composite semi-finished product forming process S1, thereby reducing the shrinkage of the semi-finished composite product PO of the pocket material along the CD direction under the action of the first elastic member 1am, and at the same time making the manufacturing system more compact.

[0185] The second composite semi-finished product formation process S2.

[0186] The second composite semi-finished product forming process S2 is located downstream of the second posture changing process S43 and the liquid-impermeable sheet conveying process S60. In the second composite semi-finished product forming process S2, the elastic waistband 4m is combined with the liquid-impermeable continuous sheet 6 to form the second composite semi-finished product P2.

[0187] like Figure 4 , Figure 7 , Figure 8 and Figure 16 As shown, in the second composite semi-finished product forming process S2, a second composite drum 16a is arranged, and the second composite drum 16a includes a second composite position F2. The second transfer position R4 of the second steering pitch adjustment device 14f is located at the same station as the second composite position F2 of the second composite drum 16a.

[0188] While the second retaining pad 14fn rotates the elastic waist 4m 90° and changes its pitch, it is conveyed to the second transfer position R4 (i.e., the second composite position F2). At the second composite position F2 (second transfer position R4), the liquid-impermeable continuous sheet 6 is located between the elastic waist 4m and the second composite drum 16a. At the second composite position F2, the second composite drum 16a combines the elastic waist 4m, which has undergone a 90° rotation and pitch change, with the liquid-impermeable continuous sheet 6 to form the second composite semi-finished product P2. The structure of the second composite drum 16a is described in detail below.

[0189] Overall composite process S3.

[0190] The overall composite process S3 is located downstream of the second negative pressure adsorption and conveying process S32, the first composite semi-finished product forming process S1, and the second composite semi-finished product forming process S2.

[0191] In the overall composite process S3, the first composite semi-finished product P1, the absorbent 3m and the second composite semi-finished product P2 are combined to form an absorbent article continuous 20.

[0192] like Figure 4 , Figure 9 , Figure 10 and Figure 17 As shown, the first composite drum 12c and the second composite drum 16a are arranged opposite each other and tangentially form the third composite position F3. At the third composite position F3, the first composite drum 12c and the second composite drum 16a combine the first composite semi-finished product P1, the absorbent 3m and the second composite semi-finished product P2 to form an absorbent article continuous 20.

[0193] Combination Figure 4 and Figure 9The first composite drum 12c rotates along its own rotation axis at a predetermined speed, and the second composite drum 16a rotates along its own rotation axis at a predetermined speed. The rotation direction of the second composite drum 16a is opposite to that of the first composite drum 12c, and the rotation direction of the second composite drum 16a is opposite to that of the second steering adjustment device 14f (the third rotation direction c).

[0194] Combination Figure 4 and Figure 9 According to an embodiment of the present invention, a first negative pressure zone D1 is formed inside the arc between the first composite position F1 and the third composite position F3 of the first composite drum 12c, and the area outside the first negative pressure zone D1 is a non-negative pressure zone. A first surface u is provided on the outer periphery of the first composite drum 12c, and the first surface u is provided with a plurality of adsorption holes (not shown in the figure).

[0195] When the first composite drum 12c rotates along its own rotation axis at a predetermined speed, it causes the first surface u to switch between the first negative pressure zone D1 and the non-negative pressure zone outside the first negative pressure zone D1. That is, the first negative pressure zone D1 and the non-negative pressure zone outside the first negative pressure zone D1 form the internal structure of the first composite drum 12c, which is fixed, while the first surface u rotates cyclically between the first negative pressure zone D1 and the non-negative pressure zone outside the first negative pressure zone D1.

[0196] The first negative pressure zone D1 is equipped with a negative pressure structure, which is connected to an external negative pressure device (such as a negative pressure fan, vacuum generator, etc.) to create negative pressure inside the first negative pressure zone D1.

[0197] The first negative pressure zone D1 corresponds to the first surface u of the first composite drum 12c, which adsorbs the first composite semi-finished product P1 and transports the first composite semi-finished product P1 from the first composite position F1 to the third composite position F3. That is, the first surface u of the first composite drum 12c adsorbs the first composite semi-finished product P1 in the arc segment F1F3 and transports the first composite semi-finished product P1 from the first composite position F1 to the third composite position F3.

[0198] The present invention uses the first negative pressure zone D1 to adsorb the first composite semi-finished product P1 onto the first surface u of the first composite drum 12c, thereby increasing the static friction between the first composite semi-finished product P1 and the first surface u, preventing the first composite semi-finished product P1 from shrinking back along the CD direction, thus causing wrinkles and affecting the composite effect.

[0199] Furthermore, an adhesive application unit H is provided on the outer periphery of the first composite drum 12c for applying hot melt adhesive to the outer surface (the side away from the first surface u) of the first composite semi-finished product P1. The first composite semi-finished product P1 with adhesive applied is conveyed to the third composite position F3.

[0200] Combination Figure 4 and Figure 9According to an embodiment of the present invention, a clamping roller 16b is arranged downstream of the third composite position F3, and the clamping roller 16b is tangential to the second composite drum 16a to form an output position F4. The clamping roller 16b is used to enhance the bonding strength between the materials of the first composite semi-finished product P1, the absorbent body 3m, and the second composite semi-finished product P2 (mainly for the middle region of the absorbent article continuous body 20 in the CD direction), thereby improving the composite effect.

[0201] The second composite drum 16a forms a second negative pressure zone D2 inside the arc between the second composite position F2 and the output position F4, and the area outside the second negative pressure zone D2 is a non-negative pressure zone. The outer periphery of the second composite drum 16a is provided with a second surface v, and the second surface v is provided with a plurality of adsorption holes (not shown in the figure).

[0202] When the second composite drum 16a rotates along its own rotation axis at a predetermined speed, it drives the second surface v to switch between the second negative pressure zone D2 and the non-negative pressure zone outside the second negative pressure zone D2. That is, the second negative pressure zone D2 and the non-negative pressure zone outside the second negative pressure zone D2 form the internal structure of the second composite drum 16a, which is fixed, while the second surface v rotates cyclically in the second negative pressure zone D2 and the non-negative pressure zone outside the second negative pressure zone D2.

[0203] The second negative pressure zone D2 is equipped with a negative pressure structure, which is connected to an external negative pressure device (such as a negative pressure fan, vacuum generator, etc.) to create negative pressure inside the second negative pressure zone D2.

[0204] The second negative pressure zone D2 corresponds to the second surface v of the second composite drum 16a, which adsorbs the second composite semi-finished product P2 and transports the second composite semi-finished product P2 from the second composite position F2 to the third composite position F3. That is, the second surface v of the second composite drum 16a adsorbs the second composite semi-finished product P2 in the arc segment F2F3 and transports the second composite semi-finished product P2 from the second composite position F2 to the third composite position F3.

[0205] The first composite drum 12c and the second composite drum 16a have a gap at the third composite position F3 to accommodate the passage of the first composite semi-finished product P1, the absorber 3m and the second composite semi-finished product P2. This gap is adjustable to match absorbers 3m of different thicknesses.

[0206] like Figure 9 , Figure 10 and Figure 17As shown, at the third composite position F3, the absorbent body 3m is located between the first composite semi-finished product P1 and the second composite semi-finished product P2. The first composite drum 12c and the second composite drum 16a, located at the third composite position F3, combine the first composite semi-finished product P1, the absorbent body 3m, and the second composite semi-finished product P2 to form an absorbent article continuous body 20. The second elastic component 4am in the elastic waistband 4m of the absorbent article continuous body 20 overlaps with the first elastic component 1am in the pocket material 1m along the thickness direction.

[0207] The second negative pressure zone D2 corresponds to the second surface v of the second composite drum 16a, which adsorbs the continuous absorbent material 20 and transports the continuous absorbent material 20 from the third composite position F3 to the output position F4.

[0208] The present invention uses the second negative pressure zone D2 to adsorb the second composite semi-finished product P2 onto the second surface v of the second composite drum 16a, thereby increasing the static friction between the second composite semi-finished product P2 and the second surface v, preventing the second composite semi-finished product P2 from shrinking back along the CD direction, thus causing wrinkles and affecting the composite effect.

[0209] At the same time, through the second negative pressure zone D2, the absorbent material continuous 20 is adsorbed onto the second surface v of the second composite drum 16a, which increases the static friction between the absorbent material continuous 20 and the second surface v, preventing the absorbent material continuous 20 from shrinking along the CD direction, thereby producing wrinkles and affecting the composite effect.

[0210] At the same time, through the second negative pressure zone D2, the absorbent material continuous body 20 is adsorbed on the second surface v of the second composite drum 16a and output by the output position F4, which improves the composite effect of the absorbent material continuous body 20. Meanwhile, it makes the absorbent material inside the absorbent body 3m more compact.

[0211] In some preferred embodiments, the central angle γ of the first composite drum 12c corresponding to the first negative pressure zone D1 ranges from 150° to 270°, that is, the angle γ (the central angle corresponding to arc segment F1F3) between the line connecting the first composite position F1 and the third axis O4 of the first composite drum 12c and the line connecting the third composite position F3 and the third axis O4 of the first composite drum 12c ranges from 150° to 270°. The negative pressure value of the first negative pressure zone D1 ranges from -1 to -8 kPa.

[0212] The central angle α of the second composite drum 16a corresponding to the second negative pressure zone D2 ranges from 100° to 270°. That is, the angle α (the central angle corresponding to arc segment F2F4) between the line connecting the second composite position F2 and the fourth axis O3 of the second composite drum 16a, and the line connecting the output position F4 and the fourth axis O3 of the second composite drum 16a, ranges from 100° to 270°. The negative pressure value range of the second negative pressure zone D2 is -1 to -8 kPa.

[0213] The ranges of the central angle γ and the central angle α, as well as the negative pressure values ​​of the first negative pressure zone D1 and the second negative pressure zone D2, are set according to the specific process requirements.

[0214] Furthermore, the line connecting the fourth axis O3 of the second composite drum 16a and the second composite position F2 (second transfer position R4) makes an angle β of 20° to 60° with the vertical direction.

[0215] In some preferred embodiments, the surfaces of the first composite drum 12c and the second composite drum 16a are both coated with a plasma coating to increase friction and prevent sticking, ensuring that the first composite semi-finished product P1 is stably adsorbed on the first surface u of the first composite drum 12c, and the second composite semi-finished product P2 is stably adsorbed on the second surface v of the second composite drum 16a.

[0216] Combination Figure 4 and Figure 9 The diameter of the second composite drum 16a of this invention is greater than or equal to the diameter of the first composite drum 12c. Because the second composite drum 16a is required to both rotate 90° at the second composite position F2 (second transfer position R4) and simultaneously composite the elastic waist 4m (after pitch change) with the impermeable continuous sheet 6 to form the second composite semi-finished product P2, and also to composite the first composite semi-finished product P1, the absorbent 3m, and the second composite semi-finished product P2 at the third composite position F3, the diameter of the second composite drum 16a is designed to be larger to improve the stability of the composite process.

[0217] like Figure 4 As shown, a clamping device 16c is provided downstream of the clamping roller 16b. The clamping device 16c includes two rollers arranged opposite each other. In order to provide conveying power, one of the rollers is configured as a drive roller (which can be connected to a motor, etc.), so that the two rollers form a driving clamp, thereby further enhancing the bonding strength between the multilayer materials (mainly used for the regions at both ends of the absorbent article continuous body 20 in the CD direction) among the first composite semi-finished product P1, the absorbent body 3m, and the second composite semi-finished product P2, and improving the composite effect. There is a gap between the two rollers to accommodate the passage of the absorbent article continuous body 20, which passes through the gap and is conveyed to the downstream side.

[0218] The absorbent material continuous body 20 is output from the output position F4 and conveyed to the clamping device 16c via the guide roller F. The absorbent material continuous body 20 passes through the gap between the two rollers of the clamping device 16c, so that the absorbent material continuous body 20 is compacted as a whole, which further improves the composite effect of the absorbent material continuous body 20 and ensures the quality of the absorbent material continuous body 20.

[0219] The continuous absorbent article 20 is clamped by the clamping device 16c and conveyed to the downstream side. After being subsequently arc-cut by the legs, it is cut along the sixth cutting line wo in the product cutting process, finally forming individual absorbent articles 20m. Figure 10 As shown.

[0220] In some other embodiments, if the absorbent article 20m has pocket material 1m on both the back B2 and the front waist B1, then the pocket material 1m in the absorbent article continuum 20 needs to be cut together along the sixth cutting line wo (not shown) to form pocket material 1m relative to the back B2 of a single absorbent article and pocket material 1m of the front waist B1 of another adjacent absorbent article.

[0221] In the first composite semi-finished product forming process S1 of this invention, the first composite material composite semi-finished product P1 is formed by bonding the pocket material composite semi-finished product PO with a pair of leak-proof material continuous sheets 5 at the first bonding position F1 through the first composite drum 12c; in the second composite semi-finished product forming process S2, the elastic waistband 4m is formed with a liquid-impermeable continuous sheet 6 at the second bonding position F2 through the second composite drum 16a; in the final bonding process S3, the first composite semi-finished product P1, the absorbent body 3m, and the second composite semi-finished product P2 are bonded together at the third bonding position F3 where the first composite drum 12c and the second composite drum 16a are tangent. Finished product P2 is composited to form absorbent article continuous body 20, thereby realizing the composite semi-finished product PO of pocket material 1m, leak-proof material continuous sheet 5, elastic waistband 4m, liquid-impermeable continuous sheet 6 and absorbent body 3m. In the first composite process S1, the second composite process S2 and the overall composite process S3, the first composite drum 12c and the second composite drum 16a are concentratedly composited, thereby reducing the shrinkage of the first elastic component 1am of pocket material 1m and the second elastic component 4am of elastic waistband 4m, avoiding wrinkles in the first composite semi-finished product P1 and the second composite semi-finished product P2, thereby avoiding wrinkles in the final absorbent article continuous body 20.

[0222] This invention comprises a 1m pocket material composite semi-finished product PO, a leak-proof continuous sheet 5, an elastic waistband 4m, a liquid-impermeable continuous sheet 6, and an absorbent body 3m. These components are composited in the first composite process S1, the second composite process S2, and the overall composite process S3 via a first composite drum 12c and a second composite drum 16a. This improves the stability and positioning accuracy of the multi-layer composite, making the overall production process layout more compact and the design more rational. It significantly improves the utilization rate of production space, enhances the stability and quality control of absorbent article manufacturing, and enables large-scale, high-precision production of absorbent articles.

[0223] In this invention, a first negative pressure zone D1 is formed inside the arc between the first composite position F1 and the third composite position F3 of the first composite drum 12c; a clamping roller 16b is arranged on the downstream side of the third composite position F3, and the clamping roller 16b is tangent to the second composite drum 16a to form an output position F4; the second composite drum 16a forms a second negative pressure zone D2 inside the arc between the second composite position F2 and the output position F4; the first composite semi-finished product P1 is conveyed between the first composite position F1 and the third composite position F3 on the first surface u of the first composite drum 12c (the area corresponding to the first negative pressure zone D1), thereby reducing the first elasticity of the pocket material 1m. The retraction of the elastic component 1am prevents wrinkles from forming in the first composite semi-finished product P1; the second composite semi-finished product P2 is conveyed between the second composite position F2 and the third composite position F3 on the second surface v of the second composite drum 16a (the area corresponding to the second negative pressure zone D2), thereby reducing the retraction of the second elastic component 4am of the elastic waist 4m and preventing wrinkles from forming in the second composite semi-finished product P2; the absorbent article continuous body 20 is conveyed between the third composite position F3 and the output position F4 on the second surface v of the second composite drum 16a (the area corresponding to the second negative pressure zone D2), preventing wrinkles from forming in the final absorbent article continuous body 20.

[0224] The expansion processing unit 12e of this invention includes a first negative pressure adsorption device 12b and an expansion unit 12d. The first negative pressure adsorption device 12b includes a first negative pressure adsorption component C1 and a second negative pressure adsorption component C2, and a conveyor belt C3 annularly wound around the outside of the first negative pressure adsorption component C1 and the second negative pressure adsorption component C2. The first negative pressure adsorption component C1 is arranged upstream of the second negative pressure adsorption component C2, and the second negative pressure adsorption component C2 has an arc-shaped structure at one end near the first negative pressure adsorption component C1, causing the conveying path of the pocket material composite semi-finished product P0 to change by 90°. By folding the original horizontal linear space into a three-dimensional arc-shaped space, the vertical height space of the equipment is fully utilized, eliminating the need to reserve excessively long horizontal workstations for straight conveying, directly reducing the floor area of ​​the equipment, and making the overall spatial layout of the equipment more compact and miniaturized.

[0225] According to embodiments of the present invention, a manufacturing system for absorbent articles is provided, for performing a method for manufacturing an absorbent article according to the present invention. The structure and arrangement of the various components of the manufacturing system have been described in detail above and will not be repeated here.

[0226] The following points need to be explained: (1) The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention. Other structures can refer to the general design.

[0227] (2) For clarity, the thickness of layers or regions is enlarged or reduced in the drawings used to describe embodiments of the invention, i.e., these drawings are not drawn to scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being “above” or “below” another element, the element may be “directly” located “above” or “below” the other element or there may be intermediate elements.

[0228] (3) Where there is no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0229] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for manufacturing an absorbent article, characterized in that, The manufacturing method includes: Pocket material composite semi-finished product formation process: The pocket material is composited with the surface continuous sheet to form the pocket material composite semi-finished product; First composite semi-finished product forming process: The first composite semi-finished product forming process includes a first composite drum, the first composite drum including a first composite position; The first composite drum is located at the first composite position, where the pocket material composite semi-finished product is combined with a pair of leak-proof material continuous sheets to form the first composite semi-finished product; Second composite semi-finished product forming process: The second composite semi-finished product forming process includes a second composite drum, the second composite drum including a second composite position; The second composite drum, at the second composite position, combines the elastic waistband with the liquid-impermeable continuous sheet to form a second composite semi-finished product; Overall composite process: The first composite drum and the second composite drum are arranged opposite to each other and tangentially form a third composite position; at the third composite position, the first composite drum and the second composite drum combine the first composite semi-finished product, the absorbent and the second composite semi-finished product to form an absorbent article continuous body; Wherein, the first composite drum forms a first negative pressure zone inside the arc between the first composite position and the third composite position; A clamping roller is arranged on the downstream side of the third composite position, and the clamping roller is tangent to the second composite drum to form an output position; The second composite drum forms a second negative pressure zone inside the arc between the second composite position and the output position; Expanding process: Located downstream of the pocket material composite semi-finished product forming process and upstream of the first composite semi-finished product forming process, used to expand and flatten the pocket material composite semi-finished product along the CD direction.

2. The manufacturing method according to claim 1, characterized in that, The widening process includes a first negative pressure adsorption and conveying process and an expansion process: First negative pressure adsorption and conveying process: The composite semi-finished product of the pocket material is conveyed to the expansion process by negative pressure adsorption. Wherein, the negative pressure adsorption force experienced by the pocket material composite semi-finished product when entering the first negative pressure adsorption and conveying process is greater than the negative pressure adsorption force experienced by the pocket material composite semi-finished product when leaving the first negative pressure adsorption and conveying process; Extended process: It is located downstream of the first negative pressure adsorption and conveying process; it is equipped with an expansion unit to apply tension to both ends of the pocket material composite semi-finished product along the CD direction, so that the pocket material composite semi-finished product remains flat and wrinkle-free, and is conveyed to the first composite semi-finished product forming process.

3. The manufacturing method according to claim 2, characterized in that, The first negative pressure adsorption and conveying process is equipped with a first negative pressure adsorption device. The first negative pressure adsorption device conveys the composite semi-finished product of the pocket material to the expansion process by means of negative pressure adsorption; The first negative pressure adsorption device includes a first negative pressure adsorption component, a second negative pressure adsorption component, and a conveyor belt that is annularly wound around the outside of the first negative pressure adsorption component and the second negative pressure adsorption component. The first negative pressure adsorption component is arranged upstream of the second negative pressure adsorption component, and the second negative pressure adsorption component has an arc-shaped structure at one end near the first negative pressure adsorption component, thereby changing the conveying path of the composite semi-finished product of the pocket material. The negative pressure adsorption force inside the first negative pressure adsorption component is greater than the negative pressure adsorption force inside the second negative pressure adsorption component.

4. The manufacturing method according to claim 1, characterized in that, The manufacturing method further includes: Pocket material conveying process: The first elastic component continuous body and the pocket continuous sheet are respectively conveyed to the first folding process; First folding process: Wrap the first elastic component continuous body inside the pocket continuous sheet to form a pocket material continuous sheet; First posture transformation process: The continuous sheet of pocket material is cut into individual pocket materials, and the pocket materials are rotated 90° while the distance is changed before being conveyed to the pocket material composite semi-finished product forming process; Surface sheet conveying process: The continuous surface sheet is conveyed to the pocket material composite semi-finished product forming process; a fixed adhesive coating unit is set up to intermittently coat the side of the continuous surface sheet facing the pocket material with pocket adhesive, and the pocket adhesive corresponds to the shape of a single absorbent item as "U".

5. The manufacturing method according to claim 4, characterized in that, The first posture transformation process involves arranging a first conveying device; The first conveying device receives a continuous sheet of pocket material at the first receiving position, cuts it at the first cutting position to form individual pocket materials, and then conveys the pocket materials to the first transfer position after changing the distance while rotating them 90°. In the process of forming a composite semi-finished product of pocket material, a pressure roller is arranged, which is opposite to the first conveying device and is located at the first transfer position; At the first transfer position, the pressure roller rotates 90° while changing the distance of the pocket material and the continuous surface sheet to form a pocket material composite semi-finished product.

6. The manufacturing method according to claim 2, characterized in that, The expansion unit consists of two pairs of rotatable clamping rollers spaced apart along the CD direction, with each pair of clamping rollers located at one end of the pocket material composite semi-finished product along the CD direction. Each pair of clamping rollers includes a first roller and a second roller arranged at intervals along the MD direction. The first roller and the second roller are respectively located on the upper and lower sides of the pocket material composite semi-finished product along the thickness direction, thereby clamping the pocket material composite semi-finished product.

7. The manufacturing method according to claim 1, characterized in that, The manufacturing method further includes: Leak-proof material conveying process: A pair of continuous sheets of the leak-proof material spaced in the CD direction are conveyed to the first composite semi-finished product forming process.

8. The manufacturing method according to claim 1, characterized in that, The manufacturing method further includes: Waistband material conveying process: The second elastic component continuous body and the waist continuous sheet are conveyed to the second folding process respectively; Second folding process: Wrap the second elastic component continuous body inside the waist continuous piece to form an elastic waist continuous piece; Second elastic component cutting process: at least the second elastic component continuous body corresponding to the middle elastic weakening area of ​​the elastic waist continuous piece is cut; The second posture transformation process involves cutting the continuous elastic waistband into individual elastic waistbands, and then conveying the elastic waistbands to the second composite semi-finished product forming process while rotating them 90° and changing their pitch. Liquid-impermeable sheet conveying process: The liquid-impermeable continuous sheet is conveyed to the second composite semi-finished product forming process.

9. The manufacturing method according to claim 8, characterized in that, The second posture transformation process involves arranging a second conveying device; The second conveying device receives the continuous elastic waistband at the second receiving position, cuts it at the second cutting position to form a single elastic waistband, and then conveys the elastic waistband to the second transfer position after changing the distance while rotating it 90°. The second transfer position and the second composite position of the second composite drum are located at the same work station; at the second composite position, the second composite drum rotates 90° while changing the pitch of the elastic waistband and the impermeable continuous sheet to form the second composite semi-finished product.

10. The manufacturing method according to claim 1, characterized in that, The manufacturing method further includes: Absorber conveying process: conveying the continuous absorber to the absorber cutting process; Absorber cutting process: The continuous absorber is cut into individual absorbers; The second negative pressure adsorption and conveying process involves conveying the absorbent to the overall composite process.

11. The manufacturing method according to claim 10, characterized in that, The second negative pressure adsorption and conveying process includes a second negative pressure adsorption device and a support, with the support located downstream of the second negative pressure adsorption device. The second negative pressure adsorption device transports the absorbent to the overall composite process; The support is used to support the absorbent before it enters the final composite process.

12. The manufacturing method according to claim 1, characterized in that, The central angle γ of the first composite drum corresponding to the first negative pressure zone ranges from 150° to 270°. The central angle α of the second composite drum corresponding to the second negative pressure zone ranges from 100° to 270°.

13. The manufacturing method according to claim 1, characterized in that, The line connecting the fourth axis of the second composite drum and the second composite position forms an angle β of 20° to 60° with the vertical direction.

14. A manufacturing system for an absorbent article, characterized in that, The manufacturing system is used to perform the manufacturing method according to any one of claims 1 to 13.

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