An apparatus for manufacturing a composite water-absorbing substrate

Abstract

The present application provides a kind of equipment for manufacturing composite water-absorbing substrate, the equipment includes first guide device;Multiple supply units;Second guide device;Meter;And marking device, wherein each supply unit starts to supply when meeting the starting condition and stops to supply when meeting the stopping condition, starting condition: R- [(Dn-Sn) mod R]=I, stopping condition: R- [(Dn-Sn-Ln) mod R]=I, marking device is marked on composite water-absorbing substrate when meeting the condition I=R, wherein I is the metering distance of meter, meter is zero after the metering distance I reaches R and re-measures, R is the length of each composite water-absorbing unit, n is the index of multiple supply units, Dn is the travel distance from the drop position of the nth supply unit to the marking position, Ln is the supply length of the nth supply unit on each composite water-absorbing unit, and Sn is the starting point length between the supply starting point of the nth supply unit on each composite water-absorbing unit and the front end mark.

Description

Technical Field

[0001] This invention relates to a substrate manufacturing apparatus, and more particularly to an apparatus for manufacturing composite absorbent substrates. Background Technology

[0002] In the prior art, when preparing composite absorbent substrates (such as diapers, panty liners, etc.), the composite layer is often formed on the lower substrate in one step by mixing the required materials in advance and then using processes such as blowing or spreading.

[0003] However, with the improvement of living standards, one-piece composite absorbent substrates cannot meet the increasingly diverse market demands. For example, regarding the demand for lightweight materials, the composite layer needs to reduce the filler material at the edges and increase the filler material in the center to ensure that the edges are as thin as possible while still maintaining absorbency. Furthermore, to reduce production costs, the structure of the composite layer can be varied according to the needs of the application scenario, thus creating any desired filler material thickness distribution along the length of the substrate. However, one-piece composite layers cannot address these needs.

[0004] In order to overcome the above-mentioned defects in the existing technology, there is an urgent need in the field for a device for manufacturing composite absorbent substrates that can manufacture composite absorbent layer structures customized according to needs, thereby meeting increasingly diverse market demands while improving efficiency and reducing costs. Summary of the Invention

[0005] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed descriptions that follow.

[0006] In order to overcome the above-mentioned defects in the existing technology, the present invention provides an apparatus for manufacturing composite absorbent substrate, which can manufacture composite absorbent layer structures customized according to needs, thereby meeting increasingly diverse market demands, while improving efficiency and reducing costs.

[0007] Specifically, according to the apparatus for manufacturing a composite absorbent substrate provided in the first aspect of the present invention, the composite absorbent substrate includes an upper substrate, a lower substrate, and a filler material between the two. The apparatus includes: a first guiding device for guiding the lower substrate along its length from a first end to a second end; a plurality of feeding units disposed above the lower substrate along its length, each feeding unit dispensing filler material onto the lower substrate traveling downwards; a second guiding device for guiding the upper substrate to the lower substrate on which the filler material has been dispensed and covering it with the filler material to form the composite absorbent substrate; a meter counter for measuring the distance traveled by the composite absorbent substrate in real time; and a marking device for marking the formed composite absorbent substrate, wherein the portion of the composite absorbent substrate between every two marks forms a composite absorbent unit, wherein each feeding unit starts feeding filler material when a start condition is met and stops feeding filler material when a stop condition is met.

[0008] Startup condition: R - [(Dn - Sn) mod R] = I,

[0009] Stopping condition: R - [(Dn - Sn - Ln) mod R] = I,

[0010] The marking device marks the composite absorbent substrate when the condition I=R is met.

[0011] Where I is the measuring distance of the meter, the meter is zeroed and remeasured after the measuring distance I reaches R, R is the length of each composite water absorption unit, n is the index of the multiple feeding units, Dn is the travel distance from the placement position of the nth feeding unit to the marking position, Ln is the feeding length of the nth feeding unit on each composite water absorption unit, and Sn is the starting point length between the feeding start point of the nth feeding unit on each composite water absorption unit and the front mark.

[0012] Preferably, in one embodiment of the present invention, the plurality of feeding units have different starting point lengths from the feeding start point to the front end mark on each composite absorbent unit to form a filling material area with a gradient thickness on each composite absorbent unit.

[0013] Preferably, in one embodiment of the present invention, the plurality of feeding units have the same starting point length from the feeding start point to the front end mark on each composite absorbent unit to form a filling material area of ​​uniform thickness on each composite absorbent unit.

[0014] Preferably, in one embodiment of the present invention, the feeding unit includes: a rack roller; and a hopper located above the rack roller, wherein the filling material in the hopper is fed onto the lower substrate via the rotating rack roller.

[0015] Preferably, in one embodiment of the present invention, the rotational speed of the rack roller of each feeding unit is determined based on the feeding thickness of the feeding unit and the traveling speed of the composite absorbent substrate.

[0016] Preferably, in one embodiment of the present invention, the device further includes a traction roller for providing traction power to the lower substrate, and the meter is attached to the traction roller to measure the rolling distance of the traction roller as the travel distance.

[0017] Preferably, in one embodiment of the present invention, the device further includes a sealing device for sealing the upper substrate and the lower substrate together.

[0018] Preferably, in one embodiment of the invention, the sealing device includes a pressure roller to press the upper substrate and the lower substrate together.

[0019] Preferably, in one embodiment of the present invention, the device further includes an adhesive spraying device for spraying adhesive onto the upper surface of the lower substrate and the lower surface of the upper substrate, and the pressure roller presses the adhesive-coated upper substrate onto the adhesive-coated lower substrate to seal the filler material.

[0020] Preferably, in one embodiment of the present invention, the device further includes a controller for controlling the operation of the plurality of feeding units and the marking device.

[0021] Furthermore, according to the apparatus for manufacturing a composite absorbent substrate provided in the second aspect of the present invention, the composite absorbent substrate includes an upper substrate, a lower substrate, and a filler material between the two, wherein a plurality of marks are uniformly distributed along the length direction on the upper or lower substrate, and the length interval between each two marks is R. The apparatus includes: a first guiding device for guiding the lower substrate to move along the length direction from a first end to a second end; a plurality of feeding units disposed above the lower substrate along the length direction of the lower substrate, each feeding unit dispensing filler material onto the lower substrate moving downwards; a second guiding device for guiding the upper substrate to the lower substrate on which the filler material has been dispensed and covering it with the filler material to form the composite absorbent substrate; a meter counter for measuring the distance traveled by the composite absorbent substrate in real time; and a mark recognition device for recognizing the marks on the composite absorbent substrate, wherein the portion of the composite absorbent substrate between each two marks forms a composite absorbent unit, wherein each feeding unit starts feeding filler material when a start condition is met and stops feeding filler material when a stop condition is met.

[0022] Startup condition: R - [(Dn - Sn) mod R] = I,

[0023] Stopping condition: R - [(Dn - Sn - Ln) mod R] = I,

[0024] Wherein, I is the measuring distance of the meter counter, and the meter counter is zeroed and remeasured whenever the mark recognition device recognizes a mark, R is the length of each composite water absorption unit, n is the index of the plurality of feeding units, Dn is the travel distance from the placement position of the nth feeding unit to the mark recognition position, Ln is the feeding length of the nth feeding unit on each composite water absorption unit, and Sn is the starting point length between the feeding start point of the nth feeding unit on each composite water absorption unit and the front mark. Attached Figure Description

[0025] The above-described features and advantages of the present invention will be better understood after reading the following detailed description of embodiments of the present disclosure in conjunction with the accompanying drawings. In the drawings, components are not necessarily drawn to scale, and components having similar related characteristics or features may have the same or similar reference numerals.

[0026] Figure 1 A schematic diagram of an apparatus for manufacturing a composite absorbent substrate according to one aspect of the present invention is shown.

[0027] Figure 2 A schematic diagram of the structure of a portion of the composite absorbent substrate provided according to one aspect of the present invention is shown.

[0028] Figure 3 A schematic diagram of an apparatus for manufacturing a composite absorbent substrate according to another aspect of the present invention is shown. Detailed Implementation

[0029] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a thorough understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Furthermore, the terms "upper," "lower," "left," "right," "top," "bottom," "horizontal," and "vertical" used in the following description should be understood as the orientations shown in the relevant paragraphs and accompanying drawings. These relative terms are for illustrative purposes only and do not imply that the described apparatus must be manufactured or operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0032] It is understood that although terms such as "first," "second," and "third" may be used herein to describe various components, regions, layers, and / or parts, these components, regions, layers, and / or parts should not be limited by these terms, and these terms are only used to distinguish different components, regions, layers, and / or parts. Therefore, the first components, regions, layers, and / or parts discussed below may be referred to as second components, regions, layers, and / or parts without departing from some embodiments of the present invention.

[0033] As mentioned above, with the improvement of living standards, one-piece composite absorbent substrates cannot meet the increasingly diverse market demands. For example, regarding the demand for lightweight materials, the composite layer needs to reduce the filler material at the edges and increase the filler material in the center to ensure that the edges are as thin as possible while still maintaining absorbency. Furthermore, to reduce production costs, the structure of the composite layer can be varied according to the needs of the application scenario, thereby creating any desired filler material thickness distribution along the length of the substrate. However, one-piece composite layers cannot address these needs.

[0034] In order to overcome the above-mentioned defects in the existing technology, the present invention provides an apparatus for manufacturing composite absorbent substrate, which can manufacture composite absorbent layer structures customized according to needs, thereby meeting increasingly diverse market demands, while improving efficiency and reducing costs.

[0035] Please refer to Figure 1 , Figure 1 A schematic diagram of an apparatus 100 for manufacturing a composite absorbent substrate according to one aspect of the present invention is shown.

[0036] The composite absorbent substrate includes an upper substrate, a lower substrate, and a filler material between the two. The filler material can be a polymer material, a mixture of materials as needed, or one of the materials in the mixture.

[0037] like Figure 1 As shown, the equipment 100 for manufacturing composite absorbent substrate may include a first guiding device for guiding a lower substrate. The supply end of the lower substrate, i.e., the first roller 11, rolls counterclockwise to release the substrate, and the product forming end, i.e., the second roller 12, rolls counterclockwise to collect the substrate, so that the lower substrate travels along its length at a certain speed. vIt travels from the first end 101 (right side in the diagram) to the second end 102 (left side in the diagram), and then forms a product at the product forming end. Figure 1 In the illustrated example, the first guiding device may include a traction roller 13 for further providing traction power to the lower substrate, and may also include multiple transition rollers 141, 142, 143, 144, 145, and 146 for guiding the movement of the lower substrate. Furthermore, the device 100 may also include a meter counter 15 for real-time measurement of the distance traveled by the composite absorbent substrate. In the illustrated embodiment, the meter counter 15 is attached to the traction roller 13 to measure the rolling distance of the traction roller 13 as the travel distance. In this case, the measured distance of the meter counter can be recorded as I, and the measured distance I is reset to zero after reaching R, and then measured again, repeatedly in this manner.

[0038] The apparatus 100 for manufacturing the composite absorbent substrate may further include a second guiding device, which may include a third roller 21, the supply end of the upper substrate, which rolls clockwise to release the substrate, guides the upper substrate to the lower substrate on which the filler material has been deposited, and covers the filler material to form the composite absorbent substrate. Furthermore, the second guiding device may also include at least one transition roller, such as the transition roller 211 shown in the figure.

[0039] The device 100 may further include four feeding units 31, 32, 33, and 34, which are arranged above the lower substrate along its length. Each feeding unit 31, 32, 33, and 34 dispenses filler material onto the lower substrate as it moves downwards. There are no specific positional requirements between the feeding units 31, 32, 33, and 34. A marking device 41 is also provided on one side of the second end 102 for marking the formed composite absorbent substrate. The portion of the composite absorbent substrate between every two marks forms a composite absorbent unit. The marks made by this marking device can be used for slicing or cutting in subsequent processes.

[0040] In addition, equipment for manufacturing composite absorbent substrates may also include sealing devices and adhesive spraying devices. The sealing device is used to seal the upper substrate and the lower substrate together. Figure 1 In the illustrated embodiment, the sealing device of the apparatus 100 may include a pressure roller 51, which presses the upper substrate and the lower substrate together. Adhesive spraying devices 61 and 62 can spray adhesive onto the upper surface of the lower substrate and the lower surface of the upper substrate, respectively. The pressure roller 51 presses the adhesive-coated upper substrate onto the adhesive-coated lower substrate to seal the filler material. Please refer to... Figure 2 , Figure 2 A schematic diagram of a portion of a composite absorbent substrate provided according to an embodiment of the present invention is shown, in which a section of the substrate containing a complete composite absorbent unit is shown.

[0041] like Figure 2 As shown, marks 411 and 412 are formed by marking device 41 to indicate the boundary between the composite absorbent units, with a distance R between them being the length of each composite absorbent unit. According to the present invention, whenever the measuring distance I of the meter reaches R, the marking device 41 marks a mark on the composite absorbent substrate, then resets the measuring distance I to zero, and marks another mark when the measuring distance I reaches R again.

[0042] by Figure 2 For example, when the measuring distance I = R, the marking device 41 marks a mark 411 on the composite absorbent substrate. Afterwards, the meter counter resets the measuring distance I to zero and remeasures. After traveling a distance R on the lower substrate, I again equals R, and a mark 412 is applied. Accordingly, the composite absorbent substrate portion between every two marks forms a composite absorbent unit. Figure 2 In the illustrated embodiment, a composite absorbent unit is located between markers 411 and 412. This equipment for manufacturing composite absorbent substrates eliminates the need for pre-marking the lower substrate before feeding, and the length R can be set and adjusted as needed.

[0043] Please refer to the reference. Figure 1 and Figure 2 , where n is the index of multiple feeding units, and Dn is the travel distance from the placement position of the nth feeding unit to the marking position. Figure 1 In the illustrated embodiment, the number of feeding units is equal to 4, therefore n = 1, 2, 3, 4. In this case, D1 is the distance traveled from the placement position of feeding unit 31 to the marking position (i.e., marking device 41), D2 is the distance traveled from the placement position of feeding unit 32 to the marking position (i.e., marking device 41), D3 is the distance traveled from the placement position of feeding unit 33 to the marking position (i.e., marking device 41), and D4 is the distance traveled from the placement position of feeding unit 34 to the marking position (i.e., marking device 41). It is understood that in other embodiments, the number of feeding units can be set to other numbers as needed. The more feeding units there are, the finer the gradient change in the thickness of the filling material on the formed composite absorbent unit. Please refer to... Figure 2 Ln is the feeding length of the nth feeding unit on each composite water absorption unit, and the two ends of the feeding length are the feeding start point 711 and the feeding end point 712. Sn is the starting point length of the nth feeding unit on each composite water absorption unit from the feeding start point 711 to the front end mark 411.

[0044] According to the present invention, the four feeding units 31, 32, 33, and 34 of the device 100 each start feeding when a corresponding start condition is met, and stop feeding when a corresponding stop condition is met. Here, the start condition is R - [(Dn - Sn) mod R] = I. According to this start condition, as... Figure 2 In the embodiment shown, the nth feeding unit starts feeding filling material 71 at the feeding start point 711; the stopping condition is R - [(Dn - Sn - Ln) mod R] = I, and according to this stopping condition, the nth feeding unit stops feeding filling material 71 at the feeding end point 712.

[0045] The above operations can be controlled via a controller (not shown in the figure). The equipment for manufacturing composite absorbent substrate may include a controller for controlling the operation of multiple feeding units and marking devices.

[0046] According to the present invention, the multiple feeding units of the equipment for manufacturing composite absorbent substrate do not need to be arranged at the same distance or have a relative positional relationship. At the same time, there is no need to install sensors or the like to identify the markings, feeding units or composite absorbent units. It is only necessary to start the feeding unit to feed or stop feeding in response to the change of the distance I measured by the meter counter.

[0047] In one embodiment, multiple feeding units have different starting point lengths Sn from their feeding start point to the front end mark on each composite absorbent unit, thereby forming a filling material region with a gradient thickness on each composite absorbent unit. Similarly, multiple feeding units can also have the same starting point length Sn from their feeding start point to the front end mark on each composite absorbent unit, thereby forming a filling material region with a uniform thickness on each composite absorbent unit. For example, by adjusting the range of the starting point length Sn, the filling material region of the first feeding unit can be the longest, and the filling material regions of subsequent feeding units can be progressively decreased, thereby forming a filling material region with a gradient thickness on each composite absorbent unit. Furthermore, at least two feeding units can remain unchanged in the range of their starting point length Sn, thereby making the filling material regions of these multiple feeding units consistent, forming multiple filling material regions with uniform thickness, and then adjusting the starting point length Sn, thereby forming a gradient filling material region while also adjusting the thickness of each gradient. Figure 1In the illustrated embodiment, four feeding units 31, 32, 33, and 34 can be configured with different starting point lengths S1, S2, S3, and S4 from the feeding start point to the front end mark on each composite water-absorbing unit, thereby forming four filling material regions with different gradients. Alternatively, feeding units 31 and 32 can be configured with the same starting point length S5 from the feeding start point to the front end mark on each composite water-absorbing unit, and feeding units 33 and 34 can be configured with the same starting point length S6 from the feeding start point to the front end mark on each composite water-absorbing unit, thereby forming two filling material regions with different gradients, and the thickness of each gradient is thicker than the gradient thickness formed by one feeding unit.

[0048] exist Figure 1 In the example shown, each feeding unit 31, 32, 33, and 34 may include a rack roller and a hopper. The rotational speed of each rack roller is based on the feeding thickness of the feeding unit 31, 32, 33, and 34 and the traveling speed of the composite absorbent substrate. v It is determined that the faster the rack and pinion roller rotates, the thicker the material will be, or the travel speed of the composite absorbent substrate... v The slower the feeding speed, the thicker the material is. For example, the rack roller 341 and the hopper 342 of the feeding unit 34 are located above the rack roller 341. The filling material in the hopper 342 is fed onto the lower substrate through the rotating rack roller 341. With the rack roller 341, the feeding unit 34 can feed the filling material more precisely, evenly and stably.

[0049] Furthermore, in one embodiment, the composite absorbent substrate may also be pre-marked, for example, with multiple marks evenly distributed along the length of the upper or lower substrate. In this case, please refer to... Figure 3 , Figure 3 A schematic diagram of an apparatus for manufacturing a composite absorbent substrate according to another aspect of the present invention is shown.

[0050] The apparatus 200 for manufacturing composite absorbent substrate includes a first guiding device similar to that in apparatus 100, for guiding the lower substrate along its length at a travel speed. v The material travels from the first end 201 (right side in the figure) to the second end 202 (left side in the figure). The first roller 211, at the supply end of the lower substrate, rolls counterclockwise to release the substrate, while the second roller 212, at the product forming end, rolls counterclockwise to collect the substrate. Additionally, the first guiding device also includes a traction roller 213 to further provide traction power to the lower substrate, and may also include multiple transition rollers 2141, 2142, 2143, 2144, 2145, and 2146 to guide the movement of the lower substrate. Furthermore, the device 200 may also include a meter counter 215 to measure the distance traveled by the composite absorbent substrate in real time; similarly, the measured distance of the meter counter is denoted as I.

[0051] The apparatus 200 for manufacturing composite absorbent substrate further includes a second guiding device for guiding the upper substrate to the lower substrate on which the filler material has been deposited and covering it with the filler material to form the composite absorbent substrate. The second guiding device may include a supply end of the upper substrate, i.e., a third roller 221, which rolls clockwise to release the substrate, and may also include at least one transition roller, for example... Figure 3 The transition roller 2211 shown.

[0052] Similarly, Figure 3 The apparatus 200 for manufacturing composite absorbent substrate shown may also be equipped with multiple feeding units 231, 232, 233, and 234. These feeding units are positioned above the lower substrate along its length, and each feeding unit dispenses filler material onto the lower substrate as it moves downwards. There are no specific positional requirements between the feeding units 231, 232, 233, and 234.

[0053] Furthermore, the equipment 200 for manufacturing composite absorbent substrates may also include a sealing device and an adhesive spraying device. Figure 3 In the illustrated embodiment, the sealing device of the apparatus 200 may include a pressure roller 251, which presses the upper substrate and the lower substrate together. The apparatus 200 may also be provided with adhesive spraying devices 261 and 262, which can spray adhesive onto the upper surface of the lower substrate and the lower surface of the upper substrate, respectively.

[0054] Unlike the equipment 100 for manufacturing composite absorbent substrate, the equipment 200 is equipped with a marking identification device 241 for identifying the markings made on the formed composite absorbent substrate. The composite absorbent substrate portion between every two markings forms a composite absorbent unit, and the length interval between every two markings is R.

[0055] Please refer to the reference. Figure 2 When using the apparatus 200 for manufacturing composite absorbent substrate provided in the second aspect of the present invention, the measuring distance I of the meter counter 215 is zeroed and remeasured when the mark recognition device 241 recognizes the mark. At this time, each feeding unit starts feeding filler material when the start condition R - [(Dn - Sn) mod R] = I is met, and stops feeding filler material when the stop condition R - [(Dn - Sn - Ln) mod R] = I is met. Wherein, n is the index of the plurality of feeding units, Dn is the travel distance from the placement position of the nth feeding unit to the mark recognition position, Ln is the feeding length of the nth feeding unit on each composite absorbent unit, and Sn is the length between the starting point of the feeding start point of the nth feeding unit on each composite absorbent unit and the starting point of the front mark.

[0056] In summary, the equipment for manufacturing composite absorbent substrates provided by this invention only needs to record the distance I measured by the meter counter to enable multiple feeding units to start and stop feeding according to preset conditions, and to dispense filling materials of different thicknesses and regions. This makes the structure of the filling material between the upper and lower layers of the composite absorbent substrate more diverse, thereby meeting the different needs of different types of composite absorbent substrates. At the same time, by changing the structure of the filling material, production costs can be saved while still meeting the functions of the composite absorbent substrate, making it very convenient and efficient. The foregoing description of this disclosure is provided to enable any person skilled in the art to make or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not intended to be limited to the examples and designs described herein, but should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for manufacturing a composite absorbent substrate, the composite absorbent substrate comprising an upper substrate, a lower substrate, and a filler material between the two, the apparatus comprising: A first guiding device is used to guide the lower substrate to travel along the length direction from the first end to the second end; Multiple feeding units are arranged above the lower substrate along the length of the lower substrate, and each feeding unit delivers filling material onto the lower substrate as it moves downward. The second guiding device is used to guide the upper substrate to the lower substrate on which the filling material has been deposited and to cover the filling material to form the composite absorbent substrate. A meter counter is used to measure the distance traveled by the composite absorbent substrate in real time. as well as A marking device is used to mark the formed composite absorbent substrate, wherein the portion of the composite absorbent substrate between every two marks forms a composite absorbent unit. Each feeding unit starts feeding filling material when the start-up conditions are met and stops feeding filling material when the stop conditions are met. Startup condition: R - [(Dn - Sn) mod R] = I, Stopping condition: R - [(Dn - Sn - Ln) mod R] = I, The marking device marks the composite absorbent substrate when the condition I = R is met. Wherein, I is the measuring distance of the meter counter, the meter counter is zeroed and remeasured after the measuring distance I reaches R, R is the length of each composite water absorption unit, n is the index of the plurality of feeding units, Dn is the travel distance from the placement position of the nth feeding unit to the marking position, Ln is the feeding length of the nth feeding unit on each composite water absorption unit, and Sn is the starting point length between the feeding start point of the nth feeding unit on each composite water absorption unit and the front end mark.

2. The device as described in claim 1, characterized in that, The multiple feeding units have different starting point lengths from the feeding start point to the front end mark on each composite water-absorbing unit, so as to form a filling material area with a gradient thickness on each composite water-absorbing unit.

3. The device as described in claim 1, characterized in that, The multiple feeding units have the same starting point length from the feeding start point to the front end mark on each composite water-absorbing unit, so as to form a filling material area with a consistent thickness on each composite water-absorbing unit.

4. The device as described in claim 1, characterized in that, The feeding unit includes: rack rollers; and A hopper is located above the rack roller, and the filling material in the hopper is fed onto the lower substrate via the rotating rack roller.

5. The device as described in claim 3, characterized in that, The rotational speed of the rack roller in each feeding unit is determined based on the feeding thickness of the feeding unit and the traveling speed of the composite absorbent substrate.

6. The device as described in claim 1, characterized in that, It also includes a traction roller for providing traction power to the lower substrate, and the meter is attached to the traction roller to measure the rolling distance of the traction roller as the travel distance.

7. The device as described in claim 1, characterized in that, It also includes a sealing device for sealing the upper substrate and the lower substrate together.

8. The device as described in claim 7, characterized in that, The sealing device includes a pressure roller to press the upper substrate and the lower substrate together.

9. The device as described in claim 8, characterized in that, It also includes a spraying device for spraying adhesive onto the upper surface of the lower substrate and the lower surface of the upper substrate, and the pressure roller presses the adhesive-coated upper substrate onto the adhesive-coated lower substrate to seal the filler material.

10. The device as claimed in claim 8, characterized in that, It also includes a controller for controlling the operation of the plurality of feeding units and the marking device.

11. An apparatus for manufacturing a composite absorbent substrate, the composite absorbent substrate comprising an upper substrate, a lower substrate, and a filler material between the two, wherein a plurality of marks are uniformly distributed along the length direction on the upper or lower substrate, and the length interval R between any two marks, the apparatus comprising: A first guiding device is used to guide the lower substrate to travel along the length direction from the first end to the second end; Multiple feeding units are arranged above the lower substrate along the length of the lower substrate, and each feeding unit delivers filling material onto the lower substrate as it moves downward. The second guiding device is used to guide the upper substrate to the lower substrate on which the filling material has been deposited and to cover the filling material to form the composite absorbent substrate. A meter counter is used to measure the distance traveled by the composite absorbent substrate in real time. as well as A marking recognition device is used to identify markings on the composite absorbent substrate. The portion of the composite absorbent substrate between every two markings forms a composite absorbent unit. Each feeding unit starts feeding filling material when the start-up conditions are met and stops feeding filling material when the stop conditions are met. Startup condition: R - [(Dn - Sn) mod R] = I, Stopping condition: R - [(Dn - Sn - Ln) mod R] = I, Wherein, I is the measuring distance of the meter counter, and the meter counter is zeroed and remeasured whenever the mark recognition device recognizes a mark, R is the length of each composite water absorption unit, n is the index of the plurality of feeding units, Dn is the travel distance from the placement position of the nth feeding unit to the mark recognition position, Ln is the feeding length of the nth feeding unit on each composite water absorption unit, and Sn is the starting point length between the feeding start point of the nth feeding unit on each composite water absorption unit and the front mark.

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