Method for manufacturing a composite core

Abstract

A manufacturing method of a composite core of the present application includes the following steps: a first composite semi-product forming step for applying a first absorbent material to a main surface of an intermediate sheet to form a first composite semi-product; a first vibration step for applying vibration to the first composite semi-product to make the first absorbent material move from the main surface side of the intermediate sheet to the back surface side in the TD direction under the action of the vibration; a composite step for compositing a first sheet to the main surface side of the intermediate sheet of the first composite semi-product to form a second composite semi-product; a turning step for turning the second composite semi-product to make the back surface of the intermediate sheet face upward; and a third composite semi-product forming step for applying a second absorbent material to the back surface of the intermediate sheet of the second composite semi-product to form a third composite semi-product. The present application reduces the agglomeration and aggregation of the absorbent material, stabilizes the overall absorbent capacity and absorbent speed of the composite core, and improves the absorbent effect.

Description

Technical Field

[0001] This invention relates to the field of disposable hygiene product manufacturing technology, particularly to the fields of sanitary napkins, diapers, pull-up pants, and sanitary pants, and specifically to a method for manufacturing a composite core. Background Technology

[0002] In existing technologies, the absorbent core used to absorb human excrement in disposable hygiene products has a composite core structure. Because composite cores do not contain fluff pulp fibers, they have advantages over traditional wood pulp cores, such as being lightweight, thin, fast-absorbing, and having low rewetting rates. This meets the current core consumer demand for "lightweight, comfortable, and high-quality" disposable hygiene products, and they have been widely used in the production of mid-to-high-end diapers and pull-up pants.

[0003] Composite cores often employ a structure where upper and lower surface sheets wrap a middle layer of fluffy nonwoven fabric (middle sheet). The middle fluffy nonwoven fabric (middle sheet) has a certain thickness and fluffiness. By filling the gaps between the fibers of the fluffy nonwoven fabric with superabsorbent polymer (SAP), the liquid absorption and water-locking functions are achieved.

[0004] In the existing manufacturing process of composite cores, polymers are mostly processed by single-time sprinkling and direct flat filling. Furthermore, the process of sheet composite and material conveying lacks precise material homogenization and posture adjustment technology, resulting in many inherent defects in actual production.

[0005] First, after the polymer is spread, it is very easy to cause local agglomeration, accumulation, and blank areas without polymer in some areas. The polymer cannot penetrate into all the fiber gaps of the fluffy nonwoven fabric (intermediate sheet) by simply spreading it flat. Most of it gathers at the bonding interface between the sheets. The distribution of polymer in the fluffy nonwoven fabric (intermediate sheet) is uneven. During use, the liquid in areas with more polymer is easily absorbed and locked, resulting in clumping and caking in these areas. The blank areas without polymer cannot be fully utilized.

[0006] Secondly, the traditional manufacturing process does not include a flipping process for the intermediate fluffy nonwoven fabric (intermediate sheet) to adjust its posture. The intermediate fluffy nonwoven fabric (intermediate sheet) of the composite core is always conveyed in a single posture. In the single-sided multiple feeding mode, most of the polymer is concentrated in one side of the intermediate fluffy nonwoven fabric (intermediate sheet), which cannot achieve uniform dispersion or filling of the entire thickness direction of the composite core. This results in a large difference in the absorption of the upper and lower sides of the composite core in the thickness direction, low utilization rate of the composite core, and affects the user experience. Summary of the Invention

[0007] This invention provides a method for manufacturing a composite core, addressing the technical problems of existing composite core manufacturing processes that use a single-spreading and direct flat-filling method. These processes result in uneven distribution and easy aggregation of polymers (absorbent materials) within the intermediate loose nonwoven fabric (intermediate sheet), leading to clumping and agglomeration in areas with high polymer aggregation during use. Furthermore, areas lacking polymers cannot be fully utilized. Additionally, the high polymers tend to aggregate on one side of the intermediate loose nonwoven fabric (intermediate sheet), resulting in significant differences in absorption capacity between the upper and lower sides of the composite core in the thickness direction.

[0008] The technical solution provided by this invention is as follows: One object of the present invention is to provide a method for manufacturing a composite core, the method comprising the following steps: A first feeding process is used to convey continuous intermediate sheets to a first composite semi-finished product forming process; the intermediate sheets have a main surface and a back surface along the TD direction; The first composite semi-finished product forming process is located downstream of the first supply process and is used to apply the first absorbent material to the main surface of the intermediate sheet to form the first composite semi-finished product. The second feeding process is used to continuously feed the first sheet to the first vibration process; The first vibration process is located downstream of the first composite semi-finished product forming process and is used to apply vibration to the first composite semi-finished product, so that the first absorbent material is subjected to vibration and moves along the TD direction from the main side to the back side of the intermediate sheet. The composite process is used to composite the first sheet onto one side of the main surface of the intermediate sheet of the first composite semi-finished product to form the second composite semi-finished product. The flipping process, located downstream of the first vibration process, is used to flip the second composite semi-finished product so that the back side of the intermediate sheet faces upward. The third feeding process is used to continuously convey the second sheet to the third composite semi-finished product forming process; The third composite semi-finished product forming process is located downstream of the first vibration process and is used to apply the second absorbent material to the back side of the intermediate sheet of the second composite semi-finished product. And, the second sheet is laminated to the back side of the intermediate sheet of the second composite semi-finished product to form the third composite semi-finished product.

[0009] In some preferred embodiments, the first vibration process is provided with a first vibration device, the first vibration device having a first input end and a first output end; the first vibration device includes: a frame, a turning roller and a conveyor roller; a conveyor belt is arranged around the outer periphery of the turning roller and the conveyor roller; The conveyor belt is used to transport the first composite semi-finished product downstream. A vibration shaft is mounted on the frame and is positioned between the flipping roller and the conveying roller. The vibration shaft is provided with an eccentric component on at least one side along the CD direction, so that when the vibration shaft rotates, it generates a periodically changing centrifugal force that drives the vibration shaft to vibrate, thereby causing the first vibration device to apply vibration to the first composite semi-finished product.

[0010] In some preferred embodiments, the composite process is located near the first output end, and the composite process is provided with a second pressure roller. The second pressure roller is arranged opposite to the flipping roller and rotates synchronously in the opposite direction with the flipping roller. The second pressure roller is used to clamp and composite the first sheet and the main surface of the intermediate sheet of the first composite semi-finished product to form a second composite semi-finished product.

[0011] In some preferred embodiments, the flipping process is located downstream of the composite process. The flipping process is used to wrap the second composite semi-finished product around the outer periphery of the flipping roller and then convey it to the downstream conveying process after it is flipped by the conveyor belt. In this process, after being flipped, the back side of the intermediate sheet of the second composite semi-finished product faces upward; the diameter of the flipping roller is larger than the diameter of the conveying roller.

[0012] In some preferred embodiments, the diameter of the flipping roller is 1.5 to 2.5 times the diameter of the conveying roller.

[0013] In some preferred embodiments, the intermediate sheet includes an upper fiber web, a lower fiber web, and an intermediate fiber web located between the upper fiber web and the lower fiber web; The bulk density of the middle fiber web is greater than that of the upper and lower fiber webs; the fiber porosity of the middle fiber web is less than that of the upper and lower fiber webs.

[0014] In some preferred embodiments, the first composite semi-finished product forming process is provided with a first guide roller, a first conveying drum and a first feeding device; Along the flow direction, the first guide roller is disposed between the first conveying drum and the first feeding device, for guiding the intermediate sheet between the first conveying drum and the first feeding device; The first feeding device is used to apply the first absorbent material to one side of the main surface of the intermediate sheet to form a first composite semi-finished product; The first conveying drum is used to convey the first composite semi-finished product downstream.

[0015] In some preferred embodiments, the outer periphery of the first conveying drum has a first conveying surface, and no negative pressure zone is provided inside the first conveying drum; The first conveying drum is configured to rotate in a first rotation direction to drive the first conveying surface to rotate in the first rotation direction; A guide device is provided on the outer circumference of the first conveying drum, and the guide device is disposed opposite to the first conveying surface of the first conveying drum; The guiding device includes a first strip member, and the first composite semi-finished product is sandwiched between the first conveying surface and the first strip member for conveying.

[0016] In some preferred embodiments, the first feeding device is located on the outer circumference of the first conveying drum, and includes: A first storage device for storing a first absorbent material; The first regulating device is used to control the amount of the first absorbent material fed into the feed. A first opening and closing device is used to open or close the first feed port so that the first absorbent material is intermittently applied to one side of the main surface of the intermediate sheet.

[0017] In some preferred embodiments, the eccentric assembly includes a first eccentric member and a second eccentric member disposed adjacent to each other; The first eccentric component is sleeved on the end of the vibration shaft and fixed by the first fixing component. The second eccentric component is sleeved on the same end of the vibration shaft and fixed by the second fixing component, so that the center of gravity of the eccentric component does not coincide with the geometric center, so that the vibration shaft generates a periodically changing centrifugal force when it rotates, thereby driving the vibration shaft to vibrate.

[0018] In some preferred embodiments, the included angle β between the first eccentric member and the second eccentric member is 0° to 180°.

[0019] In some preferred embodiments, the third composite semi-finished product forming process is provided with a second guide roller, a second conveying drum, and a second feeding device; Along the flow direction, the second guide roller is disposed between the second conveying drum and the second feeding device, for guiding the second sheet between the second conveying drum and the second feeding device; The second feeding device is used to apply the second absorbent material to the back side of the intermediate sheet of the second composite semi-finished product; The second conveying drum is used to laminate the second sheet onto the back side of the intermediate sheet of the second composite semi-finished product to form the third composite semi-finished product; In addition, at least the third composite semi-finished product is subjected to negative pressure adsorption, causing the second absorbent material to move along the TD direction from the back side of the intermediate sheet to the main side.

[0020] In some preferred embodiments, the outer periphery of the second conveying drum has a second conveying surface, and the second conveying surface is provided with a plurality of adsorption holes; The second conveying drum is configured to rotate in a second rotation direction to drive the second conveying surface to rotate in the second rotation direction; The second conveyor drum has a first position for introducing the second composite semi-finished product and a second position for exporting the third composite semi-finished product; Between the first position and the second position, a negative pressure zone is formed inside the second conveying drum, and the angle range of the negative pressure zone is 80° to 160°.

[0021] In some preferred embodiments, the manufacturing method includes the following steps: The conveying process is located between the first vibration process and the third composite semi-finished product forming process; the conveying process is equipped with a conveying device, which is a conveyor belt structure with negative pressure, for conveying the second composite semi-finished product to the third composite semi-finished product forming process.

[0022] In some preferred embodiments, the manufacturing method includes the following steps: The second vibration process is located downstream of the third composite semi-finished product forming process. It is used to apply vibration to the third composite semi-finished product, so that the second absorbent material is subjected to vibration and moves along the TD direction from the back side of the intermediate sheet to the main side.

[0023] In some preferred embodiments, the second vibration process is provided with a second vibration device; the second vibration device includes: a frame, a first roller and a second roller; a conveyor belt is arranged around the outer periphery of the first roller and the second roller; The conveyor belt is used to transport the third composite semi-finished product downstream. A vibration shaft is mounted on the frame and positioned between the first roller and the second roller; wherein the diameter of the first roller is equal to the diameter of the second roller.

[0024] In some preferred embodiments, the manufacturing method includes the following steps: The folding process is located downstream of the second vibration process and is used to fold both sides of the first sheet inward along the CD direction and fix them to the upper surface of the second sheet.

[0025] 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 for manufacturing a composite core. A first supply step conveys a continuous intermediate sheet to a first composite semi-finished product forming step. In the first composite semi-finished product forming step, a first absorbent material is applied to the main surface of the intermediate sheet to form a first composite semi-finished product. A first vibration step applies vibration to the first composite semi-finished product, causing the first absorbent material to move along the TD direction from one side of the main surface of the intermediate sheet to the other side. In this invention, when the first vibration step applies vibration to the first composite semi-finished product, neither the main surface nor the other side of the intermediate sheet is coated with adhesive. After the vibration of the first vibration step, the first absorbent material is evenly dispersed within the voids of the fibers of the intermediate sheet, without agglomeration or clumping. This invention provides a method for manufacturing a composite core. A first composite semi-finished product forming step applies a first absorbent material to the main surface of an intermediate sheet to form a first composite semi-finished product. A composite step laminates the first sheet to one side of the main surface of the intermediate sheet of the first composite semi-finished product to form a second composite semi-finished product. A flipping step flips the second composite semi-finished product so that the back side of the intermediate sheet faces upwards. A third composite semi-finished product forming step applies a second absorbent material to the back side of the intermediate sheet of the second composite semi-finished product and laminates the second sheet to one side of the back side of the intermediate sheet of the second composite semi-finished product to form a third composite semi-finished product. This achieves the application of polymers (first absorbent material and second absorbent material) to both sides (main surface and back side) of the intermediate sheet, allowing the first and second absorbent materials to penetrate deep into the pores within the fibers of the intermediate sheet. Simultaneously, it reduces the agglomeration and aggregation of the absorbent materials (first absorbent material and second absorbent material), stabilizing the overall absorption capacity and absorption rate of the composite core and improving the absorption effect.

[0026] This invention provides a method for manufacturing a composite core. A first vibration device is provided with a flipping roller and a conveying roller. A vibration shaft is positioned between the flipping roller and the conveying roller. Through the flipping action of the flipping roller, the second composite semi-finished product is flipped 180°. Since the diameter of the flipping roller is larger than that of the conveying roller, the larger diameter of the flipping roller makes the covering arc of the second composite semi-finished product longer, resulting in a smoother and more stable flipping transition. This effectively avoids the second composite semi-finished product from folding or accumulating material on the outer periphery of the flipping roller, thus preventing wrinkles and ensuring the flatness of the second composite semi-finished product. The vibration shaft has an eccentric assembly on at least one side along the CD direction. The eccentric assembly includes a first eccentric member and a second eccentric member arranged adjacent to each other. The included angle β between the first eccentric member and the second eccentric member is 0° to 180°. By adjusting the included angle β between the first eccentric member and the second eccentric member to any angle between 0° and 180°, the vibration shaft can be continuously and smoothly adjusted within the vibration intensity range corresponding to 0° to 180° without going through a fixed gear. This allows for precise matching of the vibration intensity requirements of different materials and processes. The vibration frequency of the vibration shaft can also be independently controlled (achieved through the speed of the motor) to adjust the vibration intensity of the vibration shaft, thus meeting the production adaptability of composite cores with different weights and absorption requirements. Attached Figure Description

[0027] 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.

[0028] Figure 1 This is a top view of a composite core in one embodiment of the present invention.

[0029] Figure 2 yes Figure 1 Cross-sectional view in the TT direction.

[0030] Figure 3 This is a schematic diagram of a composite core manufacturing equipment in one embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of the first composite semi-finished product forming process, the first vibration process, and the conveying process of the present invention.

[0032] Figure 5 This is a front view of the first vibration device of the present invention.

[0033] Figure 6 This is a top view of the first vibration device of the present invention.

[0034] Figure 7This is a schematic diagram of the eccentric component of the present invention in an eccentric state.

[0035] Figure 8 This is a schematic diagram of the eccentric component of the present invention in a balanced state.

[0036] Figure 9 This is a schematic diagram of the third composite semi-finished product formation process and the second vibration process of the present invention.

[0037] Figure 10 This is a front view of the second vibration device of the present invention.

[0038] Figure 11 This is a top view of the second vibration device of the present invention.

[0039] Figure 12 This is a schematic diagram of the structure of the intermediate sheet of the present invention.

[0040] Figure 13 This is a cross-sectional schematic diagram of the first composite semi-finished product of the present invention.

[0041] Figure 14 This is a flowchart of the second composite semi-finished product formation process of the present invention.

[0042] Figure 15 This is a schematic cross-sectional view of the second composite semi-finished product of the present invention after it has been flipped over.

[0043] Figure 16 This is a cross-sectional schematic diagram of the third composite semi-finished product of the present invention.

[0044] Figure 17 This is a schematic diagram of the cross-section of the third composite semi-finished product of the present invention after vibration is applied.

[0045] Figure 18 This is a cross-sectional schematic diagram of a composite core according to the present invention.

[0046] Figure 19 This is a cross-sectional schematic diagram of the back side of the intermediate sheet coated with a fourth adhesive after the second composite semi-finished product is flipped over, according to another embodiment of the present invention.

[0047] Figure 20 This is a cross-sectional schematic diagram of the third composite semi-finished product in another embodiment of the present invention.

[0048] Figure 21 This is a cross-sectional schematic diagram of the third composite semi-finished product after vibration is applied, according to another embodiment of the present invention.

[0049] Figure 22 This is a cross-sectional schematic diagram of a composite core in another embodiment of the present invention. Detailed Implementation

[0050] 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.

[0051] 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.

[0052] 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.

[0053] Combination Figure 1 and Figure 2 The present invention discloses a composite core P having mutually orthogonal MD, CD, and TD directions. The MD direction is the process direction for manufacturing the composite core P, the CD direction is perpendicular to the MD direction, and the TD direction is the thickness direction.

[0054] Along the TD direction from bottom to top, a composite core P includes a first sheet 1, an intermediate sheet 2 and a second sheet 3. The first sheet 1 and the intermediate sheet 2 are fixed together by a first adhesive G1, and the intermediate sheet 2 and the second sheet 3 are fixed together by a second adhesive G2.

[0055] In this embodiment, the intermediate sheet 2 is a fluffy nonwoven fabric. The fluffy nonwoven fabric has large gaps between the fibers, feels soft like cotton, has a certain thickness, and is resilient. It belongs to a type of nonwoven fabric that is not hardened or stiff. This fluffy nonwoven fabric can be a nonwoven fabric that has been treated with hot air.

[0056] Absorbent material 4 is infiltrated between the fiber gaps of the intermediate sheet 2. The absorbent material 4 is a superabsorbent polymer (SAP). The first sheet 1 is folded over on both sides along the CD direction toward the surface of the second sheet 3 and fixed by the third adhesive G3, forming folded portions 1m, thereby wrapping the intermediate sheet 2 inside the composite core P and preventing the absorbent material 4 from leaking from both sides.

[0057] The first sheet 1, the intermediate sheet 2, and the second sheet 3 are continuously arranged along the MD direction. The absorbent material 4 is applied either by positioning (detailed below) or continuously to the interior of the intermediate sheet 2, so that the absorbent material 4 is distributed intermittently or continuously within the intermediate sheet 2. Figure 1 The illustration shows an embodiment in which the absorbent material 4 is applied to the interior of the intermediate sheet 2 by positioning, so that the absorbent material 4 is intermittently distributed inside the intermediate sheet 2.

[0058] like Figure 1 As shown, when viewed from above, the composite core P has multiple absorbent regions Y spaced apart along the MD direction, formed by the absorbent material 4. Along the MD direction, adjacent absorbent regions Y are separated by a gap X. Within the gap X, the intermediate sheet 2 contains no absorbent material 4, meaning the absorbent material 4 is discontinuously distributed within the intermediate sheet 2. A cutting line Z is located at the center of the gap X. During production, the composite core P is cut along the cutting line Z to sever the first sheet 1, the intermediate sheet 2, and the second sheet 3, thereby forming a single absorber. In another embodiment of the invention, along the MD direction, there is no gap X between adjacent absorbent regions Y (not shown in the figure), meaning the absorbent material 4 is continuously distributed within the intermediate sheet 2.

[0059] Combination Figures 3 to 17 To manufacture the aforementioned composite core P, according to an embodiment of the present invention, a method for manufacturing a composite core is provided, comprising the following steps: The process includes the first supply process S10, the first composite semi-finished product forming process S1, the second supply process S20, the first vibration process S2, the conveying process S6, the third supply process S30, the third composite semi-finished product forming process S3, the second vibration process S4, and the wrapping process S5.

[0060] The first supply process S10 is used to transport the continuous intermediate sheet 2 to the first composite semi-finished product forming process S1.

[0061] like Figure 3 and Figure 4 As shown, under the guidance of several free rollers D, continuous intermediate sheets 2 are conveyed to the first composite semi-finished product forming process S1. The intermediate sheets 2 have a main surface 2s and a back surface 2t opposite to the main surface along the TD direction.

[0062] like Figure 12As shown, in a preferred embodiment of the present invention, the intermediate sheet 2 includes an upper fiber web 21, a lower fiber web 22, and a middle fiber web 23 located between the upper fiber web 21 and the lower fiber web 22.

[0063] The bulk density of the middle fiber web 23 is greater than that of the upper fiber web 21 and the lower fiber web 22. The fiber porosity of the middle fiber web 23 is less than that of the upper fiber web 21 and the lower fiber web 22.

[0064] For example, the upper fiber web 21 is made of coarse denier hydrophilic ES fiber with a fiber fineness of 2.0 dtex to 6.0 dtex. The upper fiber web 21 has a larger fiber porosity and a smaller bulk density on the side close to the main surface 2s, which allows body fluids to seep in quickly. The upper layer is fluffy and soft, fits the skin better, and improves comfort.

[0065] The middle layer fiber web 23 is made of fine denier hydrophilic ES fiber with a fiber fineness of 1.0 dtex to 2.0 dtex. The fiber has a high bulk density and a dense structure, thus forming a barrier layer with dense fiber bonding points. It plays a role in longitudinal liquid conduction, preventing backflow, and buffering and locking in liquid.

[0066] The lower fiber web 22 is made of coarse denier hydrophilic ES fiber or micro hydrophobic ES fiber, with a fiber fineness of 2.0 dtex to 6.0 dtex. The lower fiber web 22 has a larger fiber porosity and a smaller bulk density on the side close to the back 2t, thus utilizing the conduction and dispersion of body fluids.

[0067] The first composite semi-finished product forming process S1 is located downstream of the first supply process S10 and is used to apply the first absorbent material 4a to one side of the main surface 2s of the intermediate sheet 2 to form the first composite semi-finished product P1.

[0068] like Figure 3 and Figure 4 As shown, the first composite semi-finished product forming process S1 is equipped with a first guide roller D1, a first conveying drum 11 and a first feeding device 12.

[0069] Along the flow direction, the first guide roller D1 is disposed between the first conveying drum 11 and the first feeding device 12, and is used to guide the intermediate sheet 2 between the first conveying drum 11 and the first feeding device 12.

[0070] The first feeding device 12 is used to apply the first absorbent material 4a to one side of the main surface 2s of the intermediate sheet 2 to form the first composite semi-finished product P1.

[0071] The first conveyor drum 11 is used to convey the first composite semi-finished product P1 downstream.

[0072] Specifically, the first conveying drum 11 has a cylindrical structure, and its outer periphery has a first conveying surface 11t. The first conveying drum 11 is configured to rotate along a first rotation direction a (e.g., ...). Figure 3 and Figure 4 As shown), to drive the first conveying surface 11t to rotate along the first rotation direction a.

[0073] The first conveying drum 11 does not have a negative pressure zone inside because the first absorbent material 4a is applied between the first conveying drum 11 and the intermediate sheet 2, so there is no need to set up a suction zone or a negative pressure zone.

[0074] The first guide roller D1 is located on the outer circumference of the first conveying drum 11. The intermediate sheet 2 is guided by the first guide roller D1 between the first conveying drum 11 and the first feeding device 12 and is conveyed to the first conveying surface 11t of the first conveying drum 11. The main surface 2s of the intermediate sheet 2 faces the first conveying surface 11t of the first conveying drum 11.

[0075] like Figure 3 and Figure 4 As shown, the first feeding device 12 is located on the outer circumference of the first conveying drum 11. The first feeding device 12 includes a first storage device 12a, a first volume adjustment device 12b, and a first opening and closing device 12c.

[0076] The first storage device 12a is used to store the first absorbent material 4a. In this embodiment, the first absorbent material 4a is a polymer (superabsorbent polymer, or SAP), wherein the polymer is in granular form. Polymers have excellent water retention properties; they can absorb hundreds or even thousands of times their own weight in liquid and form a gel after absorbing the liquid, which can firmly lock in the liquid and reduce backflow.

[0077] The first regulating device 12b is used to control the amount of the first absorbent material 4a fed. The first opening and closing device 12c has a first feeding port 12d, which is used to open or close the first feeding port 12d so that the first absorbent material 4a is intermittently applied to one side of the main surface 2s of the intermediate sheet 2 to form the first composite semi-finished product P1.

[0078] The first guide roller D1 is located on the outer circumference of the first conveying drum 11 and is close to the first discharge port 12d of the first opening and closing device 12c. The intermediate sheet 2 is guided by the first guide roller D1 between the first conveying drum 11 and the first discharge device 12 and is conveyed to the first conveying surface 11t of the first conveying drum, so that the main surface 2s of the intermediate sheet 2 faces the first discharge port 12d of the first opening and closing device 12c.

[0079] A fixed amount of first absorbent material 4a is conveyed to the first opening and closing device 12c in the first regulating device 12b, and discharged through the first discharge port 12d of the first opening and closing device 12c, thereby intermittently applying the first absorbent material 4a to one side of the main surface 2s of the intermediate sheet 2 to form the first composite semi-finished product P1, such as... Figure 13 .

[0080] like Figure 13 As shown, in the first composite semi-finished product P1, most of the first absorbent material 4a falls into the fiber gaps in the upper part of the intermediate sheet 2 (near the main surface 2s side of the intermediate sheet 2). Due to the continuous stretching of the intermediate sheet 2 under conveying tension (traction force) during high-speed operation of the production line, the fibers are tightened, the fiber gaps narrow, the porosity decreases, and the gaps between fibers shrink. The penetration resistance of the first absorbent material 4a (polymer) particles increases, and the applied first absorbent material 4a cannot quickly penetrate downwards along the TD direction. A large amount of it accumulates on the main surface 2s and the side near the main surface 2s. The particles are squeezed and contacted with each other, causing some of the first absorbent material 4a to agglomerate, cluster, or even clump. There are also some areas without the first absorbent material 4a. In addition, the first absorbent material 4a (polymer), due to its light weight, has significant electrostatic force and van der Waals force (intermolecular force) between particles. It adsorbs and clumps together in the air before being applied to the intermediate sheet 2. After falling to the fiber main surface 2s side of the intermediate sheet 2, the fine particles are very easy to stick together and cannot be evenly dispersed. In this embodiment, the first opening and closing device 12c intermittently applies the first absorbent material 4a to one side of the main surface 2s of the intermediate sheet 2 by opening and closing the first feeding port 12d, so that the first composite semi-finished product P1 forms the absorbent area Y corresponding to the composite core P, and a gap X is formed between adjacent absorbent areas Y, such as... Figure 1 As shown. This achieves the positioning and application of the first absorbent material 4a, and the first composite semi-finished product P1 rotates with the rotation of the first conveying drum 11 and is conveyed to the first vibration process S2 on the downstream side.

[0081] like Figure 3 and Figure 4 As shown, a guide device 13 is provided on the outer circumference of the first conveying drum 11, and the guide device 13 is arranged opposite to the first conveying surface 11t of the first conveying drum 11.

[0082] The guiding device 13 includes a plurality of rollers and a first strip member 13r surrounding the outer periphery of the plurality of rollers. The first strip member 13r rotates cyclically in the direction of arrow f (e.g., Figure 3 and Figure 4 (As shown).

[0083] The first composite semi-finished product P1 is sandwiched between the first conveying surface 11t and the first belt member 13r and conveyed to the first vibration process S2.

[0084] The present invention, by setting a guiding device 13, allows the first composite semi-finished product P1 to be sandwiched between the first conveying surface 11t and the first strip member 13r for conveying. This can prevent the applied first absorbent material 4a from splashing and scattering due to high-speed airflow disturbance. At the same time, the clamping structure of the first conveying surface 11t and the first strip member 13r limits the width of the continuously conveyed first composite semi-finished product P1, thereby restraining the intermediate sheet 2 from shifting and edge wrinkling under high-speed production conditions, and ensuring the stability of sheet conveying.

[0085] The second supply process S20 is used to convey the continuous first sheet 1 to the first vibration process S2.

[0086] like Figure 3 and Figure 4 As shown, the second feeding process S20 is equipped with several free rollers D and a first pressure roller D3 located downstream of the free rollers D. The continuous first sheet 1 is guided and conveyed to the first vibration process S2 via the several free rollers D and the first pressure roller D3.

[0087] The first coating device H1 is set on the conveying path of the second supply process S20. The first adhesive G1 is coated onto the surface of the first sheet 1 (the side opposite to the first composite semi-finished product P1) by the first coating device H1.

[0088] The first vibration process S2 is located downstream of the first composite semi-finished product forming process S1. It is used to apply vibration to the first composite semi-finished product P1, so that the first absorbent material 4a is subjected to vibration and moves along the TD direction from the main surface 2s side of the intermediate sheet 2 to the back surface 2t side.

[0089] Composite process Sa, such as Figure 4 This is used to laminate the first sheet 1 onto one side of the main surface 2s of the intermediate sheet 2 of the first composite semi-finished product P1, forming the second composite semi-finished product P2, as follows: Figure 14 As shown in (c).

[0090] Flipping process Sb, such as Figure 4 Located downstream of the first vibration process S2, it is used to flip the second composite semi-finished product P2 so that the back side 2t of the intermediate sheet 2 faces upward, such as... Figure 14 As shown in (c) and 14(d).

[0091] Combination Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The first vibration process S2 is equipped with a first vibration device 14.

[0092] The first vibration device 14 has a first input terminal 14a located on the upstream side and a first output terminal 14b located on the downstream side. The first composite semi-finished product P1 is input to the first vibration device 14 at the first input terminal 14a, at which time the back side 2t of the intermediate sheet 2 of the first composite semi-finished product P1 faces the conveying surface (conveyor belt N3) of the first vibration device 14.

[0093] like Figure 5 and Figure 6 As shown, the first vibration device 14 includes: a frame F, a turning roller N1, a conveyor roller N2, a third roller N6, a conveyor belt N3, a vibration shaft N4, and a vacuum box N5.

[0094] The flipping roller N1 and the conveying roller N2 are respectively arranged on both sides of the vacuum box N5 along the MD direction. The conveyor belt N3 is arranged around the outer periphery of the flipping roller N1, the conveying roller N2 and the third roller N6. The third roller N6 is used to adjust the tension of the conveyor belt N3. In some other embodiments, the third roller N6 may not be provided.

[0095] Conveyor belt N3 is used to transport the first composite semi-finished product P1 downstream. It should be noted that the tilting roller N1 can also be mounted on frame F or separately on other mounting panels (not shown), without any particular limitation.

[0096] Vacuum box N5 is fixed on frame F and is located inside conveyor belt N3. The interior of vacuum box N5 is hollow or hollow, and this hollow or hollow structure is connected to external adsorption devices (such as negative pressure fans, vacuum generators, etc.).

[0097] Multiple holes (not shown) are provided on the conveyor belt N3 along the MD direction. Multiple adsorption holes N51 are provided above the vacuum box N5. The multiple adsorption holes N51 correspond to the multiple holes of the conveyor belt N3, so that the first composite semi-finished product P1 conveyed by the conveyor belt N3 is adsorbed and retained by the adsorption device.

[0098] In this embodiment, the flipping roller N1 is the driving roller, the conveying roller N2 and the third roller N6 are the driven rollers, and the diameter of the flipping roller N1 is larger than the diameter of the conveying roller N2; furthermore, the diameter of the flipping roller N1 is 1.5 to 2.5 times the diameter of the conveying roller N2.

[0099] Specifically, such as Figure 6 As shown, a pair of first bushings N14 spaced apart along the CD direction are mounted on the frame F. The two ends of the roller shaft of the tilting roller N1 are rotatably mounted on the pair of first bushings N14 via bearings.

[0100] One end of the roller shaft of the flipping roller N1 is connected to the first flange N13, and the first flange N13 is adjustablely connected to the first spacer N12 in the circumferential direction. The first spacer N12 is connected to the first drive shaft N10 via the first connecting member N11, and the first drive shaft N10 is connected to a drive source (not shown in the figure).

[0101] The two ends of the conveyor roller N2 are rotatably mounted on the frame F via bearings.

[0102] Driven by the drive source, the first drive shaft N10 drives the flip roller N1 to rotate, and the flip roller N1 drives the conveyor roller N2 to rotate, so that the conveyor belt N3 circulates and transports the first composite semi-finished product P1.

[0103] like Figure 5 and Figure 6 As shown, a vibration shaft N4 is installed on the frame F. Along the MD direction, the vibration shaft N4 is positioned between the flipping roller N1 and the conveying roller N2, and is parallel to the flipping roller N1 and the conveying roller N2 along the CD direction. The vibration shaft N4 is installed on the vacuum box N5 and passes through the vacuum box N5 along the CD direction.

[0104] In this example, the vibration shaft N4 is positioned close to the first input terminal 14a. There are no special restrictions; the vibration shaft N4 can also be positioned close to the first output terminal 14b.

[0105] The vibration shaft N4 is provided with an eccentric component N44 on at least one side along the CD direction, so that when the vibration shaft N4 rotates, it generates a periodically changing centrifugal force to drive the vibration shaft N4 to vibrate, thereby causing the first vibration device 14 to apply vibration to the first composite semi-finished product P1.

[0106] Specifically, a pair of second bushings N45, spaced apart along the CD direction, are mounted on the frame F. The two ends of the vibration shaft N4 are rotatably mounted on the pair of second bushings N45 via bearings.

[0107] One end of the vibration shaft N4 is connected to the second rim disk N43, and the second rim disk N43 is adjustablely connected to the second spacer N42 in the circumferential direction. The second spacer N42 is connected to the second drive shaft N40 via the second connector N41, and the second drive shaft N40 is connected to the drive source (not shown in the figure).

[0108] Combination Figure 5 , Figure 6 , Figure 7 and Figure 8 The vibration shaft N4 is provided with an eccentric component N44 on at least one side along the CD direction, so that the vibration shaft N4 generates a periodically changing centrifugal force when it rotates, causing the vibration shaft N4 to vibrate, thereby causing the first vibration device 14 to apply vibration to the first composite semi-finished product P1.

[0109] In this embodiment, eccentric components N44 are provided on both sides of the vibration shaft N4 along the CD direction. The eccentric components N44 are located on both sides of the vacuum chamber N4 along the CD direction. Further, along the CD direction, one eccentric component N44 is located between a second bushing N45 and a second flange N43, and the other eccentric component N44 is located outside the other second bushing N45, as shown below. Figure 6 .

[0110] like Figure 7 and Figure 8 As shown, the eccentric assembly N44 includes a first eccentric member N441 and a second eccentric member N443 arranged adjacent to each other.

[0111] The first eccentric member N441 has a first hole Na, and the second eccentric member N443 has a second hole Nb. The first eccentric member N441 is sleeved on the end of the vibration shaft N4 through the first hole Na and fixed by the first fixing member N442. The second eccentric member N443 is sleeved on the same end of the vibration shaft N4 through the second hole Nb and fixed by the second fixing member N444.

[0112] The first eccentric component N441 is sleeved on the end of the vibration shaft N4 and fixed by the first fixing component N442. The second eccentric component N443 is sleeved on the same end of the vibration shaft N4 and fixed by the second fixing component N444. This makes the center of gravity of the eccentric assembly N44 (referring to the first eccentric component N441 and the second eccentric component N443) not coincide with the geometric center, so that the eccentric assembly N44 generates a periodically changing centrifugal force when the vibration shaft N4 rotates, thereby driving the vibration shaft N4 to vibrate.

[0113] In this embodiment, the end of the first eccentric member N441 away from the first fixing member N442 is a fan-shaped (or semi-circular) structure, and the end of the second eccentric member N443 away from the second fixing member N444 is a fan-shaped (or semi-circular) structure. The materials of the first eccentric member N441 and the second eccentric member N443 can be, for example, cast iron, carbon steel, alloy steel, cast steel, etc., and in special cases, stainless steel, high-density alloy (tungsten alloy), etc. can also be used.

[0114] The present invention adjusts the included angle between the first eccentric member N441 and the second eccentric member N443 by rotating the angle of the first eccentric member N441 and / or the second eccentric member N443 on the vibration shaft N4.

[0115] like Figure 7 As shown, when there is an included angle β between the first eccentric component N441 and the second eccentric component N443, and when 0°≤β<180°, the eccentric assembly N44 is in an eccentric state.

[0116] like Figure 8As shown, when the first eccentric component N441 and the second eccentric component N443 are symmetrical to each other (the included angle β is 180°), the eccentricity of the vibration shaft N4 (the distance between the center of gravity and the geometric center of the eccentric component N44) cancels each other out, and the eccentric component N44 is in a state of no eccentricity, also known as a balanced state.

[0117] When the first eccentric component N441 and the second eccentric component N443 are completely overlapped (the included angle β is 0°), the eccentricity of the vibration shaft N4 (the distance between the center of gravity and the geometric center of the eccentric component N44) is the largest, and the generated inertial force is the strongest.

[0118] Driven by the drive source, the second drive shaft N40 drives the vibration shaft N4 to rotate. When the vibration shaft N4 rotates, the eccentric component N44 generates a periodically changing centrifugal force, which drives the vibration shaft N4 to vibrate. The vibration of the vibration shaft N4 drives the vacuum box N5 and the frame F to vibrate, causing the first vibration device 14 to vibrate, thereby applying vibration to the first composite semi-finished product P1 by the first vibration device 14.

[0119] In this invention, the included angle β between the first eccentric component N441 and the second eccentric component N443 is 0° to 180°, thereby changing the eccentric state of the eccentric assembly N44. By adjusting the included angle β between the first eccentric component N441 and the second eccentric component N443, the vibration shaft N4 can be continuously and smoothly adjusted within the vibration intensity range corresponding to 0° to 180°, without the need for fixed gears. This allows for precise matching of the vibration intensity requirements of different materials and processes. Furthermore, the vibration frequency of the vibration shaft N4 can be independently adjusted (achieved through the motor speed), thus adjusting the vibration intensity of the vibration shaft N4 to meet the production adaptability of composite cores with different weights and absorption requirements.

[0120] In this embodiment, the first drive shaft N10 and the second drive shaft N40 are connected to different drive sources. The second drive shaft N40 is driven by a separate drive source, so that the vibration shaft N4 is driven by a separate drive source. Its motor speed can be adjusted independently, so as not to affect the running speed of the main process. At the same time, the vibration frequency of the vibration shaft N4 can be adjusted by controlling the motor speed of the drive source. Since the vibration shaft N4 is driven and speed-adjusted independently, the vibration frequency does not interfere with the production line speed, which is suitable for the production of composite cores P of different specifications.

[0121] In another embodiment, the second drive shaft N40 of the vibration shaft N4 and the first drive shaft N10 of the flipping roller N1 are connected to the same drive source, that is, the first drive shaft N10 and the second drive shaft N40 are driven by the same drive source.

[0122] The first composite semi-finished product P1 is conveyed to the first vibration device 14 via the first input end 14a. The first vibration process S2 applies vibration to the first composite semi-finished product P1 through the first vibration device 14, causing the first absorbent material 4a to be vibrated and move along the TD direction from the main surface 2S side of the intermediate sheet 2 to the back surface 2t side. Figure 14 As shown in (b).

[0123] The first absorbent material 4a, originally located on the upper part of the middle sheet 2 (on the side closest to the main surface 2s), is as follows: Figure 14 a) Due to the vibration of the first vibration device 14, it moves towards the back side 2t along the TD direction. This is because, under the vibration, the fiber network of the intermediate sheet 2 undergoes continuous reciprocating deformation, and the gaps between the fibers open and close instantaneously, forming a dynamically interconnected permeation channel. The first absorbent material 4a (polymer) originally stuck on the main surface 2s gains space to migrate downwards and is no longer limited to the main surface 2s of the intermediate sheet 2. At the same time, the mechanical impact force generated by the vibration directly acts on the agglomerated or clumped first absorbent material 4a, thereby overcoming the adsorption force between particles, breaking the clumped first absorbent material 4a into a single dispersed state, eliminating the problem of local large-scale accumulation and local blank areas without particles, thus achieving uniform dispersion, such as... Figure 14 As shown in (b).

[0124] like Figure 14 As shown in (b), at this time, most of the first absorbent material 4a is dispersed in the fiber pores of the intermediate sheet 2, and there is almost no residual first absorbent material 4a on the main surface 2s of the intermediate sheet 2. This is beneficial to the composite of the first sheet 1 and the intermediate sheet 2 (see below), and avoids the phenomenon that the absorbent material (polymer) of the prior art is filled between the layers of the sheet and the polymer expands after absorbing body fluid, causing the sheet to break and delaminate.

[0125] It should be noted that, in another embodiment of the present invention, the intermediate sheet 2 includes an upper fiber web 21, a middle fiber web 23, and a lower fiber web 22. Since the bulk density of the middle fiber web 23 is greater than that of the upper fiber web 21 and the lower fiber web 22, and the fiber porosity of the middle fiber web 23 is less than that of the upper fiber web 21 and the lower fiber web 22, the first absorbent material 4a is not easily able to pass through the fiber gaps of the middle fiber web 23 of the intermediate sheet 2 due to the vibration of the first vibration device 14, thereby avoiding it from scattering on the conveyor belt N3 of the first vibration device 14 and causing waste of absorbent material. In this embodiment, the middle fiber web 23 plays a blocking role, so that most of the first absorbent material 4a stays on one side of the main surface 2s of the upper fiber web 21 (intermediate sheet 2), and a small portion of the first absorbent material 4a enters the fiber gaps of the middle fiber web 23 after vibration. In addition, it can also prevent the first absorbent material 4a from moving in large quantities from the upper fiber web 21 through the middle fiber web 23 to the lower fiber web 22; and after the second composite semi-finished product P2 is flipped (see below), it can prevent the second absorbent material 4b applied to the back side 2t of the intermediate sheet 2 from moving in large quantities from the lower fiber web 22 through the middle fiber web 23 to the upper fiber web 21, so that the first absorbent material 4a is located in the fiber gaps of the upper fiber web 21 and the middle fiber web 23 of the intermediate sheet 2, and the second absorbent material 4b is located in the fiber gaps of the lower fiber web 22 and the middle fiber web 23 of the intermediate sheet 2, preventing the first absorbent material 4a and the second absorbent material 4b from moving or drifting between the fiber webs of the intermediate sheet 2, thus preventing a messy distribution, so as to maintain good absorption performance on both the main surface 2s and the back side 2t of the intermediate sheet 2.

[0126] After the first composite semi-finished product P1 is vibrated in the first vibration process S2, the composite process Sa combines the first sheet 1 with one side of the main surface 2s of the intermediate sheet 2 of the first composite semi-finished product P1 to form the second composite semi-finished product P2. Figure 14 As shown in (c).

[0127] Specifically, the composite process Sa is located near the first output end 14b, and the continuous first sheet 1 is guided and conveyed to the first vibration process S2 by several free rollers D and the first pressure roller D3.

[0128] The first coating device H1 is set on the conveying path of the second supply process S20. The first adhesive G1 is coated onto the surface of the first sheet 1 (the side opposite to the first composite semi-finished product P1) by the first coating device H1.

[0129] In the composite process Sa, a first pressure roller D3 is set above the first vibration device 14 and contacts and presses against the conveyor belt N3 of the first vibration device 14. The first pressure roller D3 is close to the first output end 14b. On the first vibration device 14, the first sheet 1 is initially composited with the main surface 2s of the intermediate sheet 2 by the first adhesive G1.

[0130] like Figure 3 and Figure 4 As shown, in the composite process Sa, a second pressure roller 14r is provided. The second pressure roller 14r is positioned opposite to the flip roller N1 and rotates synchronously in the opposite direction to the flip roller N1. The second pressure roller 14r is used to clamp and press one side of the main surface of the intermediate sheet 2 of the first sheet 1 and the first composite semi-finished product P1 to form the second composite semi-finished product P2. Figure 14 As shown in (c).

[0131] There is a gap between the second pressure roller 14r and the flipping roller N1. When the first sheet 1 and the first composite semi-finished product P1 pass through the gap, they are clamped and pressed, so that the first sheet 1 and the intermediate sheet 2 are composited, ensuring that the layers of the second composite semi-finished product P2 are firmly bonded and tightly bonded, avoiding the warping and displacement between layers, and improving the bonding strength between the sheet layers.

[0132] like Figure 14 As shown in (d), the second composite semi-finished product P2 has side regions C1 located on both sides along the CD direction, and a central region C2 located between the two side regions C1. Along the CD direction, the first sheet 1 extends from the side region C1 on one side through the central region C2 to the side region C1 on the other side, and the intermediate sheet 2, the first adhesive G1, and the first absorbent material 4a are all located in the central region C2.

[0133] After being clamped by the second pressure roller 14r and the flipping roller N1, the flipping process Sb flips the second composite semi-finished product P2 so that the back side 2t of the intermediate sheet 2 faces upwards. Figure 14 As shown in (c) and 14(d).

[0134] Specifically, the flipping process Sb is located downstream of the composite process Sa. The flipping process Sb is used to wrap the second composite semi-finished product P2 around the outer circumference of the flipping roller N1 and, after flipping it with the conveyor belt N3, transport it to the downstream conveying process S6, thereby ensuring that the back side 2t of the intermediate sheet 2 faces upwards. Figure 14 As shown in (c) and 14(d), after being flipped, the back side 2t of the middle sheet 2 of the second composite semi-finished product P2 faces upward. The diameter of the flipping roller N1 is larger than the diameter of the conveying roller N2.

[0135] After the second composite semi-finished product P2 is flipped along with the conveyor belt N3, it is transferred to the conveying process S6 at the first output end 14b. At this time, the second composite semi-finished product P2 has undergone a 180° flip. Figure 14 As shown in (d). That is, originally, the main surface 2s of the intermediate sheet 2 in the second composite semi-finished product P2 was facing upwards, and after the second composite semi-finished product P2 was flipped, the back surface 2t of the intermediate sheet 2 was facing upwards, as shown in (d). Figure 14 (c) and Figure 14 As shown in (d).

[0136] In this invention, the diameter of the flipping roller N1 is larger than the diameter of the conveying roller N2; furthermore, the diameter of the flipping roller N1 is 1.5 to 2.5 times the diameter of the conveying roller N2; through the flipping action of the flipping roller N1, the second composite semi-finished product P2 is driven to complete a 180° flip; and because the diameter of the flipping roller N1 is larger than the diameter of the conveying roller N2, the larger diameter of the flipping roller N1 makes the covering arc of the second composite semi-finished product P2 longer, thereby making the flipping transition smoother and more stable, effectively avoiding the phenomenon of folding or material accumulation of the second composite semi-finished product P2 on the outer periphery of the flipping roller N1, which would cause wrinkles in the second composite semi-finished product P2, thus ensuring the flatness of the second composite semi-finished product P2.

[0137] The second composite semi-finished product P2 leaves the first vibration device 14 at the first output end 14b and is conveyed downstream to the conveying process S6.

[0138] The conveying process S6 is located between the first vibration process S2 and the third composite semi-finished product forming process S3, and is used to convey the second composite semi-finished product P2 to the third composite semi-finished product forming process S3.

[0139] The conveying process S6 is equipped with a conveying device M, which is a conveyor belt structure with negative pressure. It is used to adsorb the second composite semi-finished product P2 and convey it to the third composite semi-finished product forming process S3. During the conveying process, the back side 2t of the middle sheet 2 of the second composite semi-finished product P2 faces upward.

[0140] The second composite semi-finished product P2 after being flipped (e.g.) Figure 14 (d) and Figure 15 As shown), it is attracted and conveyed on the conveying device M to the third composite semi-finished product forming process S3 on the downstream side.

[0141] The third feeding process S30 is used to convey the continuous second sheet 3 to the third composite semi-finished product forming process S3.

[0142] like Figure 3 and Figure 9 As shown, under the guidance and conveying of several free rollers D, the second sheet 3 is continuously conveyed to the third composite semi-finished product forming process S3.

[0143] The second coating device H2 is installed on the conveying path of the third supply process S30. The second adhesive G2 is coated onto the surface of the second sheet 3 (the side opposite to the second composite semi-finished product P2) by the second coating device H2.

[0144] The third composite semi-finished product forming process S3 is located downstream of the first vibration process S2, and is used to apply the second absorbent material 4b to the back side 2t of the intermediate sheet 2 of the second composite semi-finished product P2. Further, the third composite semi-finished product forming process S3 is located downstream of the conveying process S6.

[0145] Furthermore, the second sheet 3 is laminated to the back side 2t of the intermediate sheet 2 of the second composite semi-finished product P2 to form the third composite semi-finished product P3.

[0146] like Figure 3 and Figure 9 As shown, the third composite semi-finished product forming process S3 is equipped with a second guide roller D2, a second conveying drum 15, and a second feeding device 16.

[0147] Along the flow direction, the second guide roller D2 is disposed between the second conveying drum 15 and the second unloading device 16, for guiding the second sheet 3 between the second conveying drum 15 and the second unloading device 16.

[0148] The second feeding device 16 is used to apply the second absorbent material 4b to the back side 2t of the intermediate sheet 2 of the second composite semi-finished product P2.

[0149] The second conveying drum 15 is used to laminate the second sheet 3 onto the back side 2t of the middle sheet 2 of the second composite semi-finished product P2 to form the third composite semi-finished product P3. In addition, at least the third composite semi-finished product P3 is subjected to negative pressure adsorption, causing the second absorbent material 4b to move along the TD direction from the back side 2t side of the intermediate sheet 2 to the main surface 2s side.

[0150] Specifically, such as Figure 3 and Figure 9 As shown, the second conveying drum 15 has a cylindrical structure, and its outer periphery has a second conveying surface 15t. The second conveying surface 15t is provided with multiple suction holes (not shown in the figure). The second conveying drum 15 is configured to rotate along a second rotation direction b (e.g., ...). Figure 3 and Figure 9 As shown), to drive the second conveying surface 15t to rotate along the second rotation direction b.

[0151] like Figure 3 and Figure 9 As shown, the second transfer drum 15 has a first position 15a for the second composite semi-finished product P2 to be introduced, and a second position 15b for the third composite semi-finished product P3 (described in detail below) to be exported.

[0152] Between the first position 15a and the second position 15b, a negative pressure zone 15k is formed inside the second transfer drum 15, and a non-negative pressure zone is formed outside the negative pressure zone 15k. The angle range of the negative pressure zone 15k is 80° to 160°. In the negative pressure zone 15k, the second transfer surface 15t of the second transfer drum 15 adsorbs the second composite semi-finished product P2 and the third composite semi-finished product P3.

[0153] The second conveying drum 15 drives the second conveying surface 15t to rotate along the second rotation direction b, causing the second conveying surface 15t to cycle between the negative pressure zone 15k and the non-negative pressure zone. That is, the negative pressure zone 15k and the non-negative pressure zone remain fixed, while the second conveying surface 15t cycles between the negative pressure zone 15k and the non-negative pressure zone.

[0154] A negative pressure structure is provided in the negative pressure zone 15k, which is connected to an external negative pressure device (such as a negative pressure fan, vacuum generator, etc.) to create negative pressure inside the negative pressure zone 15k, drawing air into the inner side of the second conveying surface 15t. The area outside the negative pressure zone 15k forms a non-negative pressure zone, corresponding to an area where there is no negative pressure air on the second conveying surface 15t of the second conveying drum 15.

[0155] When the second composite semi-finished product P2 is conveyed to the second conveying surface 15t of the second conveying drum 15 via the first position 15a, the second conveying surface 15t adsorbs and conveys the second composite semi-finished product P2.

[0156] like Figure 3 and Figure 9 As shown, the second feeding device 16 is located on the outer circumference of the second conveying drum 15. The second feeding device 16 includes a second storage device 16a, a second volume adjustment device 16b, and a second opening and closing device 16c.

[0157] The second storage device 16a is used to store the second absorbent material 4b. In this embodiment, the second absorbent material 4b is a polymer (superabsorbent polymer or SAP).

[0158] The first absorbent material 4a and the second absorbent material 4b can be the same polymer or different polymers. In this embodiment, the first absorbent material 4a and the second absorbent material 4b are the same polymer.

[0159] If the first absorbent material 4a and the second absorbent material 4b are different polymers, the absorption effects on the upper and lower sides of the composite core P along the TD direction can be differentiated to meet different product requirements. Furthermore, the width dimensions of the first absorbent material 4a and the second absorbent material 4b along the CD direction can be the same or different, thus allowing for differentiated design of the absorption effects of the composite core P along both the CD and TD directions.

[0160] The second regulating device 16b is used to control the amount of the second absorbent material 4b fed. The second opening and closing device 16c is used to open or close the second discharge port 16d so that the second absorbent material 4b is intermittently applied to the back side 2t of the second composite semi-finished product P2.

[0161] like Figure 3 and Figure 9 As shown, the second guide roller D2 is located on the outer circumference of the second conveying drum 15 and close to the second discharge port 16d of the second opening and closing device 16c. The second sheet 3 is guided into the space between the second conveying drum 15 and the second discharge device 16d via the second guide roller D2.

[0162] A fixed amount of the second absorbent material 4b is conveyed to the second opening and closing device 16c in the second regulating device 16b and discharged through the second discharge port 16d of the second opening and closing device 16c, thereby intermittently applying the second absorbent material 4b between the back side 2t of the second composite semi-finished product P2 and the second sheet 3.

[0163] The second conveying surface 15t of the second conveying drum 15 adsorbs and conveys the second composite semi-finished product P2, and composites the second sheet 3 with the back side 2t of the middle sheet 2 of the second composite semi-finished product P2. The second sheet 3 and the second composite semi-finished product P2 are fixed together by the second adhesive G2 to form the third composite semi-finished product P3. Figure 16 As shown.

[0164] In this embodiment, the second opening and closing device 16c intermittently applies the second absorbent material 4b to the back side 2t of the second composite semi-finished product P2 by opening and closing the second discharge port 16d. The second absorbent material 4b and the first absorbent material 4a overlap along the TD direction. The second absorbent material 4b and the first absorbent material 4a form the absorption area Y of the second composite semi-finished product P2 corresponding to the composite core P, and a gap X is formed between adjacent absorption areas Y, such as... Figure 1 As shown.

[0165] The second conveying surface 15t adsorbs the third composite semi-finished product P3. It is conveyed in the region between the first position 15a and the second position 15b of the second conveying drum 15 (i.e., the negative pressure zone 15k). The negative pressure zone 15k adsorbs the second conveying surface 15t under negative pressure, thereby adsorbing the third composite semi-finished product P3 under negative pressure. This causes the second absorbent material 4b to move along the TD direction from the back side 2t of the intermediate sheet 2 to the main surface 2s, thus distributing the second absorbent material 4b within the fiber gaps on the back side 2t of the intermediate sheet 2. Figure 16 As shown.

[0166] At the same time, due to the high-speed operation of the equipment, the second absorbent material 4b may agglomerate, cluster, or even clump together, such as Figure 16As shown, the reason why the second absorbent material 4b agglomerates or clumps is the same as the reason why the first absorbent material 4a agglomerates or clumps, so it will not be elaborated on here.

[0167] like Figure 16 As shown, there is a clear interface between the first absorbent material 4a and the second absorbent material 4b at this time. At this interface, the first absorbent material 4a and the second absorbent material 4b are less distributed, that is, the first absorbent material 4a is mostly located on the side closer to the main surface 2s, and the second absorbent material 4b is mostly located on the side closer to the back surface 2t.

[0168] like Figure 3 and Figure 9 As shown, in the third composite semi-finished product forming process S3, a guide roller 17 is provided at the second position 15b. The guide roller 17 is located on the outer circumference of the second conveying drum 15 and is positioned opposite to the second conveying drum 15. The third composite semi-finished product P3 is transferred to the downstream second vibration process S4 by the guide roller 17 at the second position 15b.

[0169] The second vibration process S4 is located downstream of the third composite semi-finished product forming process S3. It is used to apply vibration to the third composite semi-finished product P3, so that the second absorbent material 4b is subjected to vibration and moves along the TD direction from the back side 2t side of the intermediate sheet 2 to the main surface 2s side.

[0170] like Figure 3 As shown, the second vibration process S4 is equipped with a second vibration device 18. The second vibration device 18 applies vibration to the second composite semi-finished product P2.

[0171] The second vibration device 18 has a second input end 18a located on the upstream side and a second output end 18b located on the downstream side. The third composite semi-finished product P3 is input to the second vibration device 18 at the second input end 18a and exits the second vibration device 18 at the second output end 18b to be conveyed to the downstream side.

[0172] Combination Figure 9 , Figure 10 and Figure 11 The second vibration device 18 includes: a frame F, a first roller N1' and a second roller N2'; a conveyor belt N3 is arranged around the outer periphery of the first roller N1' and the second roller N2', and the conveyor belt N3 is used to transport the third composite semi-finished product P3 downstream.

[0173] A vibration shaft N4 is installed on the frame F, and the vibration shaft N4 is positioned between the first roller N1' and the second roller N2'; the diameter of the first roller N1' is equal to the diameter of the second roller N2', and the second vibration device 18 does not have a third roller N6.

[0174] The other structures of the second vibration device 18 are the same as those of the first vibration device 14, and will not be described in detail here.

[0175] In this embodiment, the diameter of the first roller N1' is equal to the diameter of the second roller N2', ensuring the smooth transport of the third composite semi-finished product P3 and preparing it for the downstream side to enter the wrapping process S5 for wrapping.

[0176] During the process of the third composite semi-finished product P3 being transported from the second input end 18a to the second output end 18b of the second vibration device 18, the second vibration process S4 applies vibration to the third composite semi-finished product P3 through the second vibration device 18, causing the second absorbent material 4b to be subjected to vibration and move along the TD direction from the back side 2t side of the intermediate sheet 2 to the main surface 2s side.

[0177] After the second absorbent material 4b is applied to the back side 2t of the intermediate sheet 2, it is also affected by the high-speed operation of the production line and the electrostatic and van der Waals forces between the particles of the second absorbent material 4b. This makes it prone to agglomeration, clumping, and localized accumulation in the fiber gaps on the back side 2t and near the back side 2t. The second vibration process S4 disrupts the electrostatic and van der Waals forces between the particles through mechanical vibration, thereby breaking up the agglomerates or clusters of particle material on the back side 2t, thus ensuring uniform dispersion of the second absorbent material 4b. Due to the vibration, the fiber pores of the intermediate sheet 2 dynamically open and close, allowing the second absorbent material 4b to penetrate and diffuse from the back side 2t of the intermediate sheet 2 towards the main surface 2s, blending with the first absorbent material 4a that previously penetrated deep into the fibers of the intermediate sheet 2 (if the intermediate sheet 2 is a three-layer fiber web). The interface between the first absorbent material 4a and the second absorbent material 4b becomes blurred, making the distribution of the third composite semi-finished product P3 more balanced in the TD direction, avoiding a concentration of absorbent material on one side and a blank area on the other. Figure 17 As shown.

[0178] like Figure 17 As shown, the first absorbent material 4a and the second absorbent material 4b are more evenly dispersed between the fiber gaps in the intermediate sheet 2, and there is no residual second absorbent material 4b on the back side 2t of the intermediate sheet 2. This is beneficial for the composite of the intermediate sheet 2 and the second sheet 3, and avoids the phenomenon in the prior art where absorbent material (polymer) is filled between the layers of the sheet and the polymer expands after absorbing body fluid, causing the sheet to break and delaminate.

[0179] In this invention, after the first vibration process S2 and the second vibration process S2, the first absorbent material 4a and the second absorbent material 4b are evenly dispersed inside the intermediate sheet 2, so that they are not easy to clump or agglomerate after absorbing bodily fluids and excrement, and the absorption effect is better.

[0180] like Figure 3As shown, a third coating device H3 is provided downstream of the third composite semi-finished product forming process S3. Specifically, the third coating device H3 is provided in the second vibration process S4, and the third coating device H3 is located above the second vibration device 18. The third coating device H3 is used to coat the side areas C1 of the first sheet 1 along the CD direction with a third adhesive G3, as shown. Figure 17 As shown.

[0181] The folding process S5 is located downstream of the second vibration process S4. It is used to fold both sides of the first sheet 1 inward along the CD direction and fix them to the upper surface of the second sheet 3.

[0182] like Figure 3 As shown, the folding process S5 is equipped with a folding device 19, which is used to fold the side areas C1 on both sides of the first sheet 1 inward along the CD direction, and fix them to the upper surface of the second sheet 3 by the third adhesive G3 to form a composite core P, as shown. Figure 18 As shown.

[0183] Specifically, the folding device 19 folds the side regions C1 on both sides of the first sheet 1 inward along the CD direction and fixes them to the upper surface of the second sheet 3 with the third adhesive G3, thereby wrapping the middle sheet 2 on both sides along the CD direction and preventing the first absorbent material 4a and the second absorbent material 4b from leaking from the side.

[0184] The folding process S5 is also equipped with a pressing device 20, which is located downstream of the folding device 19. The pressing device 20 includes a first pressing roller 20a and a second pressing roller 20b arranged opposite to each other. It is used to clamp and drive the composite core P along the TD direction, thereby improving the bonding strength between the sheets and providing driving force to transport the composite core P downstream.

[0185] After passing through the pressing device 20, the composite core P is conveyed to the downstream side along the MD direction. After the product cutting process (not shown), it is cut along the cutting line Z, thereby cutting the first sheet 1, the intermediate sheet 2 and the second sheet 3 to form a single absorber.

[0186] like Figure 3 and Figure 4 As shown, in some embodiments, a fourth coating device H4 is provided upstream of the third composite semi-finished product forming process S3. The fourth coating device H4 is used to coat a fourth adhesive G3' onto the back side 2t of the intermediate sheet 2 of the second composite semi-finished product P2.

[0187] Specifically, the fourth coating device H4 coats the fourth adhesive G3' onto the back side 2t of the intermediate sheet 2 of the second composite semi-finished product P2, such as... Figure 19 As shown.

[0188] In the third composite semi-finished product forming process S3, the second absorbent material 4b is applied between the back side 2t of the second composite semi-finished product P2 and the second sheet 3, and the fourth adhesive G3' wraps around the outer periphery of the second absorbent material 4b. The second conveying surface 15t of the second conveying drum 15 adsorbs and conveys the second composite semi-finished product P2, and composites the second sheet 3 with one side of the back side 2t of the middle sheet 2 of the second composite semi-finished product P2. The second sheet 3 and the second composite semi-finished product P2 are fixed together by the second adhesive G2 to form the third composite semi-finished product P3. Figure 20 As shown.

[0189] In this case, the negative pressure zone 15k adsorbs the second conveying surface 15t under negative pressure, thereby adsorbing at least the third composite semi-finished product P3 under negative pressure. This causes the second absorbent material 4b, after being encapsulated by the fourth adhesive G3', to move along the TD direction from the back side 2t of the intermediate sheet 2 towards the main surface 2s. Since the second absorbent material 4b is a lightweight polymer powder, it is easily subject to gravity and prone to settling and falling off due to the limited space between the fibers of the intermediate sheet 2. By spraying the fourth adhesive G3' onto the back side 2t, the applied particles of the second absorbent material 4b fall into the adhesive layer and are completely encapsulated by the fourth adhesive G3'. The particles are bound by the adhesive film, significantly reducing the settling tendency caused by gravity and preventing the second absorbent material 4b from sliding towards the main surface 2s. It remains stably on the back side 2t of the intermediate sheet 2. Figure 20 As shown. Therefore, the second absorbent material 4b can be stably held on one side of the back surface 2t of the intermediate sheet 2, and the first absorbent material 4a is held on one side of the main surface 2s of the intermediate sheet 2.

[0190] In the second vibration process S4 downstream of the third composite semi-finished product P3, vibration is applied to the third composite semi-finished product P3 by the second vibration device 18. The second absorbent material 4b, which encapsulates the fourth adhesive G3', is dispersed by the vibration and moves along the TD direction from the back side 2t of the intermediate sheet 2 to the main surface 2s. This blurs or even eliminates the interface between the first absorbent material 4a and the second absorbent material 4b, resulting in uniform dispersion throughout the entire area. Figure 21 As shown. The fourth adhesive G3' bonds and fixes the second absorbent material 4b to the fibers of the intermediate sheet 2, so that it is not easy to shift or aggregate even after absorbing bodily fluids and other excretions.

[0191] like Figure 3 As shown, the second vibration process S4 includes a third coating device H3, which is located above the second vibration device 18. The third coating device H3 is used to coat the third adhesive G3 onto the side regions C1 of the first sheet 1 along the CD direction, as shown. Figure 21 As shown.

[0192] The folding process S5 is located downstream of the second vibration process S4. It is used to fold both sides of the first sheet 1 inward along the CD direction and fix them to the upper surface of the second sheet 3.

[0193] like Figure 3 As shown, the folding process S5 is equipped with a folding device 19, which is used to fold the side areas C1 on both sides of the first sheet 1 inward along the CD direction, and fix them to the upper surface of the second sheet 3 by the third adhesive G3 to form a composite core P, as shown. Figure 22 As shown.

[0194] The folding process S5 has been described in detail in the above embodiments and will not be repeated here. 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.

[0195] (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.

[0196] (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.

[0197] 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 a composite core, characterized in that, The manufacturing method includes the following steps: A first feeding process is used to convey continuous intermediate sheets to a first composite semi-finished product forming process; the intermediate sheets have a main surface and a back surface along the TD direction; The first composite semi-finished product forming process is located downstream of the first supply process and is used to apply the first absorbent material to the main surface of the intermediate sheet to form the first composite semi-finished product. The second feeding process is used to continuously feed the first sheet to the first vibration process; The first vibration process is located downstream of the first composite semi-finished product forming process and is used to apply vibration to the first composite semi-finished product, so that the first absorbent material is subjected to vibration and moves along the TD direction from the main side to the back side of the intermediate sheet. The composite process is used to composite the first sheet onto one side of the main surface of the intermediate sheet of the first composite semi-finished product to form the second composite semi-finished product. The flipping process, located downstream of the first vibration process, is used to flip the second composite semi-finished product so that the back side of the intermediate sheet faces upward. The third feeding process is used to continuously convey the second sheet to the third composite semi-finished product forming process; The third composite semi-finished product forming process is located downstream of the first vibration process and is used to apply the second absorbent material to the back side of the intermediate sheet of the second composite semi-finished product. And, the second sheet is laminated to the back side of the intermediate sheet of the second composite semi-finished product to form the third composite semi-finished product.

2. The manufacturing method according to claim 1, characterized in that, The first vibration process is equipped with a first vibration device, which has a first input end and a first output end; the first vibration device includes: a frame, a turning roller, and a conveyor roller; a conveyor belt is arranged around the outer periphery of the turning roller and the conveyor roller. The conveyor belt is used to transport the first composite semi-finished product downstream. A vibration shaft is mounted on the frame and is positioned between the flipping roller and the conveying roller. The vibration shaft is provided with an eccentric component on at least one side along the CD direction, so that when the vibration shaft rotates, it generates a periodically changing centrifugal force that drives the vibration shaft to vibrate, thereby causing the first vibration device to apply vibration to the first composite semi-finished product.

3. The manufacturing method according to claim 2, characterized in that, The composite process is located near the first output end. The composite process is equipped with a second pressure roller. The second pressure roller is arranged opposite to the flipping roller and rotates synchronously in the opposite direction with the flipping roller. The second pressure roller is used to clamp and press one side of the main surface of the first sheet and the intermediate sheet of the first composite semi-finished product to form a second composite semi-finished product.

4. The manufacturing method according to claim 3, characterized in that, The flipping process is located downstream of the composite process. The flipping process is used to wrap the second composite semi-finished product around the outer periphery of the flipping roller and then convey it to the downstream conveying process after it is flipped by the conveyor belt. In this process, after being flipped, the back side of the intermediate sheet of the second composite semi-finished product faces upward; the diameter of the flipping roller is larger than the diameter of the conveying roller.

5. The manufacturing method according to claim 4, characterized in that, The diameter of the flipping roller is 1.5 to 2.5 times the diameter of the conveying roller.

6. The manufacturing method according to claim 1, characterized in that, Along the TD direction, the intermediate sheet includes an upper fiber web, a lower fiber web, and an intermediate fiber web located between the upper fiber web and the lower fiber web; The bulk density of the middle fiber web is greater than that of the upper and lower fiber webs; the fiber porosity of the middle fiber web is less than that of the upper and lower fiber webs.

7. The manufacturing method according to claim 1, characterized in that, The first composite semi-finished product forming process is equipped with a first guide roller, a first conveying drum, and a first feeding device; Along the flow direction, the first guide roller is disposed between the first conveying drum and the first feeding device, for guiding the intermediate sheet between the first conveying drum and the first feeding device; The first feeding device is used to apply the first absorbent material to one side of the main surface of the intermediate sheet to form a first composite semi-finished product; The first conveying drum is used to convey the first composite semi-finished product downstream.

8. The manufacturing method according to claim 7, characterized in that, The outer periphery of the first conveying drum has a first conveying surface, and no negative pressure zone is provided inside the first conveying drum; The first conveying drum is configured to rotate in a first rotation direction to drive the first conveying surface to rotate in the first rotation direction; A guide device is provided on the outer circumference of the first conveying drum, and the guide device is disposed opposite to the first conveying surface of the first conveying drum; The guiding device includes a first strip member, and the first composite semi-finished product is sandwiched between the first conveying surface and the first strip member for conveying.

9. The manufacturing method according to claim 7, characterized in that, The first feeding device is located on the outer circumference of the first conveying drum and includes: A first storage device for storing a first absorbent material; The first regulating device is used to control the amount of the first absorbent material fed into the feed. A first opening and closing device is used to open or close the first feed port so that the first absorbent material is intermittently applied to one side of the main surface of the intermediate sheet.

10. The manufacturing method according to claim 2, characterized in that, The eccentric assembly includes a first eccentric member and a second eccentric member arranged adjacent to each other; The first eccentric component is sleeved on the end of the vibration shaft and fixed by the first fixing component. The second eccentric component is sleeved on the same end of the vibration shaft and fixed by the second fixing component, so that the center of gravity of the eccentric component does not coincide with the geometric center, so that the vibration shaft generates a periodically changing centrifugal force when it rotates, thereby driving the vibration shaft to vibrate.

11. The manufacturing method according to claim 10, characterized in that, The included angle β between the first eccentric member and the second eccentric member is 0° to 180°.

12. The manufacturing method according to claim 1, characterized in that, The third composite semi-finished product forming process is equipped with a second guide roller, a second conveying drum, and a second feeding device; Along the flow direction, the second guide roller is disposed between the second conveying drum and the second feeding device, for guiding the second sheet between the second conveying drum and the second feeding device; The second feeding device is used to apply the second absorbent material to the back side of the intermediate sheet of the second composite semi-finished product; The second conveying drum is used to laminate the second sheet onto the back side of the intermediate sheet of the second composite semi-finished product to form the third composite semi-finished product; In addition, at least the third composite semi-finished product is subjected to negative pressure adsorption, causing the second absorbent material to move along the TD direction from the back side of the intermediate sheet to the main side.

13. The manufacturing method according to claim 12, characterized in that, The outer periphery of the second conveying drum has a second conveying surface, and the second conveying surface is provided with a plurality of suction holes; The second conveying drum is configured to rotate in a second rotation direction to drive the second conveying surface to rotate in the second rotation direction; The second conveyor drum has a first position for introducing the second composite semi-finished product and a second position for exporting the third composite semi-finished product; Between the first position and the second position, a negative pressure zone is formed inside the second conveying drum, and the angle range of the negative pressure zone is 80° to 160°.

14. The manufacturing method according to claim 1, characterized in that, The manufacturing method includes the following steps: The conveying process is located between the first vibration process and the third composite semi-finished product forming process; the conveying process is equipped with a conveying device, which is a conveyor belt structure with negative pressure, used to adsorb the second composite semi-finished product and convey it to the third composite semi-finished product forming process.

15. The manufacturing method according to claim 1, characterized in that, The manufacturing method includes the following steps: The second vibration process is located downstream of the third composite semi-finished product forming process. It is used to apply vibration to the third composite semi-finished product, so that the second absorbent material is subjected to vibration and moves along the TD direction from the back side of the intermediate sheet to the main side.

16. The manufacturing method according to claim 15, characterized in that, The second vibration process is equipped with a second vibration device; the second vibration device includes: a frame, a first roller and a second roller; a conveyor belt is arranged around the outer periphery of the first roller and the second roller; The conveyor belt is used to transport the third composite semi-finished product downstream. A vibration shaft is mounted on the frame and positioned between the first roller and the second roller; wherein the diameter of the first roller is equal to the diameter of the second roller.

17. The manufacturing method according to claim 16, characterized in that, The manufacturing method includes the following steps: The folding process is located downstream of the second vibration process and is used to fold both sides of the first sheet inward along the CD direction and fix them to the upper surface of the second sheet.

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