JP2022042797A - Liquid adhesion method, and manufacturing method of absorptive article and manufacturing device of absorptive article using liquid adhesion method - Google Patents

Abstract

To provide a technique capable of making a liquid adhere to a material, in a predetermined adhesion width.SOLUTION: A liquid adhesion method sprays a liquid from a liquid spray device to a material made of fibrous material while the material is conveyed in a fixed direction by a conveyance device, and thereby makes the liquid adhere to the material. The liquid spray device has a nozzle to spray the liquid and adjust a spray pressure of the nozzle in accordance with a conveyance speed of the conveyance device and adjust the adhesion width of the liquid in accordance with the spray pressure.SELECTED DRAWING: Figure 1

Description

The present invention relates to a liquid adhesion method, a method for producing an absorbent article using the same, and an apparatus for producing an absorbent article.

Conventionally, absorbent articles such as disposable diapers, urine pads, and sanitary products have been known. Generally, the absorbent article is formed into a thin sheet-like shape, a mat-like shape, or the like, and includes an absorber that absorbs the body fluid discharged by the wearer. Patent Document 1 describes a method for producing an absorbent article including an absorber.

Japanese Unexamined Patent Publication No. 2019-23855

In the process of manufacturing an absorbent article, the material used for the absorber is transported by a transport device. The process of manufacturing an absorbent article may include a step of adhering a liquid to a material being transported by a transport device. In order to achieve the required function in the absorbent article, it is necessary to adhere the liquid to the material with a predetermined adhesion width. However, no specific proposal has been made regarding the method of adhering the liquid.

An object of the present invention is to provide a technique capable of adhering a liquid to a material with a predetermined adhering width.

In order to solve the above problems, in the present invention, it is decided to adjust the adhesion width of the liquid according to the spray pressure of the liquid.

More specifically, the present invention is a liquid bonding method for adhering the liquid to the material by spraying the liquid from the liquid spraying device onto a material made of a fiber material transported in a certain direction by the transport device. The liquid spraying device has a nozzle for spraying the liquid, and adjusts the spray pressure of the nozzle according to the transport speed of the transport device and adjusts the adhesion width of the liquid according to the spray pressure. And, including.

In the above liquid adhesion method, the adhesion width may be adjusted by the relative distance between the material and the nozzle.

In the above liquid adhesion method, the adhesion width may be adjusted by the angle of the nozzle with respect to the vertical direction.

In the above liquid adhesion method, the adhesion width may be adjusted by an angle in the horizontal direction with the transfer direction of the transfer device.

In the above liquid adhesion method, the adhesion width may be adjusted by tilting the widthwise end portion of the material to the inside or the outside of the material.

In the above liquid adhesion method, the adhesion width may be adjusted by injecting compressed air toward the liquid discharged from the nozzle.

In the above liquid adhesion method, a spray pressure adjusting unit that adjusts the spray pressure of the nozzle according to the transport speed of the transport device, and an adhesion width adjusting unit that adjusts the adhesion width of the liquid according to the spray pressure. The adhesion width may be adjusted by using a control device having the above.

In addition, the present invention can be grasped from the aspect of the method for producing an absorbent article. For example, the present invention is a method for producing an absorbent article, and may include a liquid adhesion step of adhering a liquid to the material used for the absorbent article by using the above liquid adhesion method.

In addition, the present invention can be grasped from the aspect of the manufacturing apparatus for absorbent articles. For example, the present invention is a device for manufacturing an absorbent article, which has a transport device for transporting a material made of a fiber material in a certain direction and a nozzle for spraying a liquid, and is directed toward the material on the transport device. A liquid spraying device that sprays the liquid, a spray pressure adjusting unit that adjusts the spray pressure of the nozzle according to the transport speed of the transport device, and an adhesion width adjustment that adjusts the adhesion width of the liquid according to the spray pressure. It may be provided with a unit.

According to the present invention, the liquid can be attached to the material with a predetermined adhesion width.

FIG. 1 is a flowchart showing an outline of a liquid adhesion method. FIG. 2 is a diagram showing an example of an apparatus for manufacturing an absorbent article. FIG. 3 is a block diagram showing a functional unit of the control device. FIG. 4 is a diagram showing a specific example 2 of a liquid adhesion method by an apparatus for manufacturing an absorbent article. FIG. 5A is a diagram (No. 1) showing a specific example 3 of a liquid adhesion method by an apparatus for manufacturing an absorbent article. FIG. 5B is a diagram (No. 2) showing a specific example 3 of a liquid adhesion method by an apparatus for manufacturing an absorbent article. FIG. 6A is a diagram (No. 1) showing a specific example 4 of a liquid adhesion method by an apparatus for manufacturing an absorbent article. FIG. 6B is a diagram (No. 2) showing a specific example 4 of a liquid adhesion method by an apparatus for manufacturing an absorbent article. FIG. 7A is a diagram (No. 1) showing a specific example 5 of a liquid adhesion method by an apparatus for manufacturing an absorbent article. FIG. 7B is a diagram (No. 2) showing a specific example 5 of a liquid adhesion method by an apparatus for manufacturing an absorbent article. FIG. 8 is a perspective view of a tape-type disposable diaper. FIG. 9 is an exploded perspective view of the diaper. FIG. 10 is a cross-sectional view when the inseam region is cut in the width direction thereof.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The configurations of the following embodiments are examples, and the present invention is not limited to the configurations of these embodiments.

<Outline of liquid adhesion method>
A material made of a fiber material is used as an absorber of the absorbent article. Examples of the fiber material include short fibers of cellulose-based fibers such as pulp fibers, rayon fibers, and cotton fibers, and short fibers obtained by subjecting synthetic fibers such as polyethylene, polypropylene, and polyethylene terephthalate to a hydrophilic treatment. The material is formed in the form of a sheet, is cut into a predetermined size, and is used as an absorber. The liquid is attached to this material during transportation by the transfer device before it is cut. This liquid is, for example, water, a chemical solution, or the like. For example, when superabsorbent polymer (SAP) particles are sprinkled on a material, water, a chemical solution, or the like is used before the process of sprinkling the SAP particles in order to retain the SAP particles in the material. Liquid adheres to the material. Since the SAP particle group is held in the material by the water adhering to the material, the SAP particles can be placed in an appropriate position. Further, in order to improve the wearing feeling of the absorbent article, a chemical solution such as a skin care agent or an antibacterial agent may be attached to the material.

In order to achieve the required function in the absorbent article, it is necessary to adhere the liquid to the material with a predetermined adhesion width. The adhesion width is the adhesion width of the liquid in the width direction orthogonal to the longitudinal direction of the material.

The liquid adhesion method according to the present embodiment is a method of adhering a liquid to a material by spraying the liquid from the liquid spraying device to the material transported in a certain direction by the transport device. The liquid sprayer has a nozzle that sprays the liquid onto the material being transported. For example, the amount of liquid adhered can be adjusted by the spray pressure of the liquid from the nozzle. Specifically, the amount of adhesion can be increased by increasing the spray pressure, and the amount of adhesion can be reduced by decreasing the spray pressure. However, the amount of liquid adhered also changes depending on the transport speed of the transport device that transports the material. For example, when the spray pressure is constant, the amount of liquid adhered per unit area decreases as the transport speed increases, and the amount of liquid adhered per unit area increases as the transport speed decreases. Therefore, in order to keep the amount of liquid adhered per unit area constant, it is necessary to adjust the spray pressure according to the transport speed. In general, the larger the spray pressure, the wider the liquid spray width, and the smaller the spray pressure, the narrower the liquid spray width. Therefore, when the spray pressure is adjusted, the liquid adhesion width on the material changes. It ends up.

In addition, if the transport speed is increased in order to increase the production rate of the absorbent article, the amount of liquid adhered per unit area decreases, so the spray pressure may be increased in order to keep the amount of liquid adhered constant. It is conceivable that if the spray pressure is increased, the spraying width of the liquid will be widened, and therefore the adhesion width of the liquid in the material will be widened. Further, if the spraying width of the liquid becomes too wide, the liquid may be sprayed on the outside of the widthwise end portion of the material.

In addition, if the transport speed is reduced in order to reduce the production rate of the absorbent article, the amount of liquid adhered per unit area is reduced, so the spray pressure may be increased in order to keep the amount of liquid adhered constant. It is conceivable that if the spray pressure is lowered, the spraying width of the liquid becomes narrower, so that the adhesion width of the liquid in the material becomes narrower. When the liquid is attached to the material in order to hold the SAP particles in the material, if the adhesion width of the liquid is narrower than the arrangement width of the SAP particles, the SAP particles cannot be held in the material. Further, when a chemical solution such as a skin care agent or an antibacterial agent is attached to a material, the chemical solution cannot be attached to a required area, so that the effect of this chemical solution cannot be sufficiently obtained. It is also conceivable to replace the nozzle with a nozzle that can spray the liquid with an appropriate adhesion width according to the transport speed, but since it is necessary to temporarily stop the manufacturing equipment when replacing the nozzle, it depends on the transport speed. Replacing the nozzle will reduce the productivity of the absorbent article.

Therefore, in the liquid adhesion method according to the present embodiment, the spray pressure of the nozzle is adjusted according to the transfer speed of the transfer device, and the liquid adhesion width is adjusted according to the spray pressure. According to the liquid adhesion method according to the present embodiment, it is not necessary to replace the nozzle, and the liquid can be adhered to the material with a predetermined adhesion width.

FIG. 1 is a flowchart showing an outline of the liquid adhesion method according to the present embodiment. In the liquid adhering step according to the present embodiment, first, the spray pressure of the nozzle is adjusted according to the transport speed of the transport device (step S101). Next, the adhesion width of the liquid is adjusted according to the spray pressure of the nozzle (step S102). The higher the transport speed, the higher the spray pressure of the nozzle to increase the amount of liquid sprayed from the nozzle per unit time, and the lower the transport speed, the lower the spray pressure of the nozzle to spray from the nozzle per unit time. Reduce the amount of liquid applied and keep the amount of liquid sprayed per unit area of material constant. Further, when the spray pressure of the nozzle is increased, the spraying width of the liquid becomes wide, and when the spray pressure of the nozzle is lowered, the spraying width of the liquid becomes narrow. The liquid adhesion method according to the present embodiment can maintain the liquid adhesion width in the material substantially constant even if the liquid spray width changes due to the spray pressure of the nozzle.

Next, the liquid adhesion method according to the present embodiment will be described in more detail with reference to FIG. FIG. 2 is a diagram showing an example of an absorbent article manufacturing apparatus used in the absorbent article manufacturing method in which the liquid adhesion method according to the present embodiment is used. The manufacturing apparatus M used for manufacturing the absorbent article includes a transport line M1 (an example of the “transport device” in the present application), a liquid spraying device M2, and a control device M3. The transport line M1 is a conveyor that transports the material A, which is a so-called continuous sheet, in a fixed direction (direction indicated by an arrow in the figure). The material A is made of a fiber material and is used as an absorber of an absorbent article by being cut into a predetermined size. The liquid spraying device M2 has a nozzle 200 for spraying the liquid L toward the material A, and sprays the liquid L on the material A on the transport line M1. When the liquid L is sprayed toward the material A, the liquid L is attached to the material A. The spray pressure of the nozzle 200 is adjusted to 0.01 MPa to 0.5 MPa so that the liquid is adhered at a predetermined adhesion amount according to the transport speed.

The control device M3 is composed of a microcomputer, and each is executed by a CPU (Central Processing Unit) (not shown) by executing a program stored in a storage means (ROM (Read Only Memory) or the like and not shown). Realize the function. FIG. 3 is a block diagram showing a functional unit of the control device M3. The control device M3 has a spray pressure adjusting unit 301 and an adhesion width adjusting unit 302 as functional units. The spray pressure adjusting unit 301 is a functional unit that adjusts the spray pressure of the nozzle 200 according to the transport speed of the transport line so that a predetermined amount of liquid of the material A is adhered. The adhesion width adjusting unit 302 is a functional unit that adjusts the adhesion width of the liquid according to the spray pressure of the nozzle 200.

Next, a specific example of adjusting the adhesion width of the liquid L will be described. In the present embodiment, the adhesion width of the liquid L is adjusted by the five methods of Specific Examples 1 to 5.

<Specific example 1>
Specific example 1 is a method of adjusting the adhesion width by adjusting the relative distance between the material A and the nozzle 200. The liquid L is sprayed from the nozzle opening of the nozzle 200 toward the material A in a conical shape having the nozzle opening as the apex. The liquid L may be sprayed flat from the nozzle opening. Therefore, the adhesion width can be adjusted by the diameter of the bottom surface of the cone. The adhesion width of the liquid L in the material A becomes narrower as the relative distance between the material A and the nozzle 200 becomes shorter, and becomes wider as the relative distance between the material A and the nozzle 200 becomes longer. Therefore, the adhesion width can be adjusted by the relative distance between the material A and the nozzle 200. The control device M3 stores the spray pressure of the nozzle 200 and the adhesion width of the liquid L based on the relative distance between the material A and the nozzle 200, and the adhesion width adjusting unit 302 adheres the liquid with a predetermined adhesion width. Adjust this relative distance to make it work. Specifically, the adhesion width adjusting unit 302 adjusts this relative distance by operating a drive mechanism that moves either the liquid spraying device M2 or the transport line M1 in the vertical direction. The relative distance between the material A and the nozzle 200 may be adjusted by moving the liquid spraying device M2 including the nozzle 200 in the vertical direction, or by moving the transport line M1 in the vertical direction. May be good. A known drive mechanism can be used.

<Specific example 2>
The second specific example is a method of adjusting the adhesion width according to the angle of the nozzle 200 with respect to the vertical direction. FIG. 4 is a diagram showing a manufacturing apparatus M in a state where the nozzle 200 is tilted with respect to the vertical direction. In FIG. 4, the control device M3 is not shown. As shown in FIG. 2, when the nozzle 200 is oriented in the vertical direction, the liquid L is sprayed from the nozzle opening toward the material A in a conical shape with the nozzle opening as the apex. When the nozzle 200 is tilted with respect to the vertical direction, the liquid L is sprayed from the nozzle opening toward the material A in an oblique conical shape with the nozzle opening as the apex. The larger the angle of the nozzle 200 with respect to the vertical direction, the wider the adhesion width of the liquid in the material A. Therefore, the adhesion width can be adjusted by the angle of the nozzle 200 with respect to the vertical direction. The control device M3 stores the spray pressure of the nozzle 200 and the adhesion width of the liquid L based on the angle of the nozzle 200 with respect to the vertical direction, and the adhesion width adjusting unit 302 adheres the liquid with a predetermined adhesion width. In addition, adjust this angle. Specifically, the adhesion width adjusting unit 302 operates a drive mechanism that tilts the liquid spraying device M2 including the nozzle 200 in the transport direction shown in the drawing or in the width direction of the material A orthogonal to the transport direction and the vertical direction. Adjust this angle with. A known drive mechanism can be used.

<Specific example 3>
The third specific example is a method of adjusting the adhesion width according to the angle between the transport direction and the horizontal direction of the transport line M1. FIG. 5A is a diagram showing a manufacturing apparatus M in a state where the transport direction is tilted with respect to the horizontal direction so that the downstream side in the transport direction is higher than the upstream side in the transport direction. FIG. 5B is a diagram showing a manufacturing apparatus M in a state where the transport direction is tilted with respect to the horizontal direction so that the downstream side in the transport direction is lower than the upstream side in the transport direction. Note that the control device M3 is not shown in FIGS. 5A and 5B. As shown in FIG. 5A, the adhesion width can be narrowed by inclining the transport direction with respect to the horizontal direction so that the downstream side in the transport direction is higher than the upstream side in the transport direction. On the other hand, as shown in FIG. 5B, the adhesion width can be widened by inclining the transport direction with respect to the horizontal direction so that the downstream side in the transport direction is lower than the upstream side in the transport direction. Therefore, the adhesion width can be adjusted by the angle between the transport direction and the horizontal direction of the transport line M1. The control device M3 stores the spray pressure of the nozzle 200 and the adhesion width of the liquid L based on the angle between the transfer direction and the horizontal direction of the transfer line M1, and the adhesion width adjusting unit 302 stores the liquid with a predetermined adhesion width. Adjust this angle to adhere. Specifically, the adhesion width adjusting unit 302 adjusts this angle by operating a drive mechanism that tilts the transport line M1 so that the transport direction is tilted with respect to the horizontal direction. A known drive mechanism can be used.

<Specific example 4>
Specific Example 4 is a method of adjusting the adhesion width by tilting the widthwise end portion of the material A to the inside or the outside of the material A. FIG. 6A is a diagram showing a manufacturing apparatus M in a state where the widthwise end portion of the material A is tilted inward of the material A when the manufacturing apparatus M is viewed from the downstream side to the upstream side. FIG. 6B is a diagram showing a manufacturing apparatus M in a state where the widthwise end portion of the material A is tilted to the outside of the material A when the manufacturing apparatus M is viewed from the downstream side to the upstream side. In this example, the liquid spraying device M2 is arranged so that the two nozzles 200 are arranged in the width direction of the material A. As described above, the liquid spraying device M2 may have two or more nozzles 200. Note that the control device M3 is not shown in FIGS. 6A and 6B. As shown in FIG. 6A, the adhesion width can be narrowed by tilting the widthwise end portion of the material A inward of the material A. Further, as shown in FIG. 6B, the adhesion width can be widened by inclining the widthwise end portion of the material A to the outside of the material A. The adhesion width adjusting unit 302 provides a guide G1 for tilting the widthwise end of the material A inward of the material A or a guide G2 for tilting the widthwise end of the material A to the outside of the material A on the transport line M1. The material A can be tilted and the liquid adhesion width can be adjusted by controlling the advancement to the liquid. The adhesion width adjusting unit 302 adjusts the adhesion width of the liquid by controlling the drive mechanism that causes the guides G1 and G2 to advance onto the transport line M1. A known drive mechanism can be used.

<Specific example 5>
A specific example 5 is a method of adjusting the adhesion width by injecting compressed air toward the liquid L discharged from the nozzle 200. FIG. 7A shows a state in which compressed air is injected toward the lower end of the widthwise end portion of the liquid L so that the adhesion width of the liquid L becomes narrow when the manufacturing apparatus M is viewed from the downstream side to the upstream side. It is a figure which shows the manufacturing apparatus M of. FIG. 7B shows a state in which compressed air is injected toward the upper end of the widthwise end portion of the liquid L so that the adhesion width of the liquid L becomes wider when the manufacturing apparatus M is viewed from the downstream side to the upstream side. It is a figure which shows the manufacturing apparatus M of. The manufacturing device M of this example includes an air injection device M4 that injects compressed air. Further, in this example, the liquid spraying device M2 is arranged so that the two nozzles 200 are arranged in the width direction of the material A. In FIGS. 7A and 7B, the white arrows represent the flow of compressed air. As shown in FIG. 7A, the adhesion width of the liquid L can be narrowed by injecting compressed air toward the lower end of the widthwise end portion of the liquid L. On the other hand, as shown in FIG. 7B, by injecting compressed air toward the upper end of the widthwise end portion of the liquid L, the compressed air bounces off the liquid L and flows outward in the width direction. By flowing the liquid L outward in the width direction by the bounced compressed air, the adhesion width of the liquid L can be widened. The adhesion width adjusting unit 302 can adjust the adhesion width of the liquid L by injecting compressed air toward the liquid L as shown in FIGS. 7A and 7B by controlling the operation of the air injection device M4. can. The control device M3 stores the spray pressure of the nozzle 200, the injection pressure of the compressed air, and the adhesion width of the liquid L based on the injection direction, and the adhesion width adjusting unit 302 adheres the liquid with a predetermined adhesion width. Therefore, the injection pressure and the injection direction are adjusted.

In the liquid adhesion method according to the present embodiment, by adopting any of Specific Examples 1 to 5, the liquid adhesion width can be adjusted according to the spray pressure of the liquid L, so that a predetermined adhesion amount and adhesion can be performed. The width allows the liquid to adhere to the material. Further, the liquid adhesion method according to the present embodiment can be used in the liquid adhesion step of adhering the liquid to the material used for the absorbent article. Therefore, the liquid adhesion method according to the present embodiment can be used as a method for producing an absorbent article.

As an example of an absorbent article using the above manufacturing method, a tape-type disposable diaper will be described. FIG. 8 is a perspective view of a tape-type disposable diaper (hereinafter, simply referred to as “diaper”) 1. In the present embodiment, the longitudinal direction of the diaper 1 is the direction connecting the front body arranged facing the abdomen of the wearer and the back body arranged facing the back. Between these front bodies (one side in the longitudinal direction) and the back body (the other side in the longitudinal direction) (center in the longitudinal direction), the inseam is placed in the inseam of the wearer (arranged facing the crotch). The part is located. In addition, when the disposable diaper is worn on the wearer (hereinafter abbreviated as "wearing state"), the side facing the wearer's skin (inside when worn) is the skin surface side, and the opposite side of the skin surface side. (Outside when attached) is the non-skin side. Further, the direction connecting the skin surface side and the non-skin surface side is the thickness direction, and the direction orthogonal to both the longitudinal direction and the thickness direction is the width direction. In addition, viewing from the thickness direction is defined as a plan view.

The diaper 1 has an inseam region 1B that covers the wearer's genital area in the worn state, a front body region 1F located on the front side of the inseam region 1B, and a back body region 1R located on the back side of the inseam region 1B. Tapes 2L and 2R that can be attached to the front patch 2F provided on the non-wearer side surface of the front body area 1F are provided on the left and right edges of the back body area 1R. Therefore, in the diaper 1, when the front body area 1F is arranged on the ventral side of the wearer and the back body area 1R is arranged on the back side of the wearer, the tapes 2L and 2R are attached to the front patch 2F. , It is fixed to the wearer's body in a state surrounding the wearer's abdomen and thighs.

In the diaper 1, an absorber capable of absorbing and holding the liquid is mainly arranged in the vicinity of the inseam region 1B. A liquid adhered to the absorber by the liquid adhering method described above is used. In addition, in order to prevent the formation of a gap that serves as a liquid outflow route between the diaper 1 and the wearer's skin, the diaper 1 has three-dimensional gathers 3BL, 3BR at the portion surrounding the wearer's thigh. Is provided, and a waist gather 3R is provided at a portion surrounding the wearer's abdominal circumference. The three-dimensional gather 3BL, 3BR and the waist gather 3R are in close contact with the wearer's skin due to the elastic force of the rubber thread. Therefore, the liquid discharged from the wearer's genital area is absorbed by the diaper 1 absorber without leaking from the diaper 1.

FIG. 9 is an exploded perspective view of the diaper 1. Further, FIG. 10 is a cross-sectional view when the inseam region 1B is cut in the width direction thereof. The diaper 1 has a cover sheet 4 that forms an outer surface when worn. The cover sheet 4 is a sheet-like member having a substantially rectangular appearance with 4KL and 4KR constricted in a portion corresponding to a long side. The constriction 4KL and 4KR are provided at the position where the wearer's thigh is located. The cover sheet 4 is provided for reinforcing the back sheet 5 and improving the feel. For example, in order to suppress leakage of excrement, a non-woven fabric made of a liquid-impermeable thermoplastic resin may be used as the material thereof. can. Examples of the liquid-impermeable thermoplastic resin include polyethylene (PE) and polypropylene (PP).

The diaper 1 has a back sheet 5, an absorber 6C, and a top sheet 7 that are sequentially laminated on the wearer-side surface of the cover sheet 4. The back sheet 5, the absorber 6C, and the top sheet 7 are all sheet-like members having a rectangular appearance, and are sequentially laminated on the cover sheet 4 in a state where the longitudinal direction coincides with the longitudinal direction of the cover sheet 4. .. Like the cover sheet 4, the back sheet 5 is a sheet formed of a liquid-impermeable thermoplastic resin as a material in order to suppress leakage of excrement. Further, the top sheet 7 is a sheet-like member arranged on the skin surface side of the wearer so as to cover the water absorption surface of the absorber 6C. The top sheet 7 has liquid permeability in a part or all thereof. Therefore, in the state where the diaper 1 is worn, the liquid excreted from the wearer enters the absorber 6C through the top sheet 7 which may come into contact with the wearer's skin and is absorbed there. For example, a woven fabric, a non-woven fabric, or a porous film can be used as a material for the top sheet 7. Further, the top sheet 7 may also have hydrophilicity.

Then, when the wearer's pubic area is covered with the cover sheet 4 in which the back sheet 5, the absorber 6C, and the top sheet 7 are laminated, both ends of the back sheet 5, the absorber 6C, and the top sheet 7 in the longitudinal direction are formed. It will be located on the ventral and dorsal sides of the wearer. That is, the genital area of the wearer is covered with the absorber 6C from the ventral side to the dorsal side of the wearer. Therefore, regardless of whether the wearer discharges the liquid to the outside of the body in either the posture with the abdomen facing down or the posture with the back facing down, the discharged liquid touches the absorber 6C via the top sheet 7. It will be.

Further, the diaper 1 has elongated strip-shaped side sheets 8L, 8R for forming the above-mentioned three-dimensional gathers 3BL, 3BR. The side seats 8L and 8R are provided on the long side portion of the top seat 7. Similar to the three-dimensional gathers 3BL and 3BR of the diaper 1, the side seats 8L and 8R are provided with 8KL and 8KR constricted at the position where the wearer's thigh is located. The thread rubbers 8EL and 8ER are arranged along the longitudinal direction in the constricted 8KL and 8KR. Therefore, when the diaper 1 is in a worn state, that is, when the diaper 1 is in a U-shaped side view, the constricted 8KL and 8KR are attracted in the longitudinal direction by the contraction force of the rubber threads 8EL and 8ER from the top sheet 7. It becomes a three-dimensional gather that stands up and prevents the outflow of liquid.

Further, the thread rubber 9ER for forming the waist gather 3R described above is provided between the back sheet 5 and the top sheet 7 at a position further back from the end portion of the absorber 6C. The thread rubber 9ER is provided between the back sheet 5 and the top sheet 7 in a direction in which the longitudinal direction, which is the expansion / contraction direction, is the left-right direction of the diaper 1. Therefore, when the tapes 2L and 2R provided on the left and right sides of the rubber thread 9ER are attached to the front patch 2F on the ventral side of the wearer, the rubber thread 9ER exerts a contraction force to give the diaper 1 to the wearer. It is brought into close contact to prevent a gap from being formed between the diaper 1 and the wearer's abdominal circumference. In addition, thread rubbers 9SL and 9SR are provided on both sides of the absorber 6C to prevent a gap from being formed between the diaper 1 and the wearer's abdominal circumference.

The absorber 6C contains water in the gaps between short fibers of cellulosic fibers such as pulp fibers, rayon fibers, or cotton fibers, and short fibers obtained by hydrophilizing synthetic fibers such as polyethylene, polypropylene, or polyethylene terephthalate. It has a structure in which a granular absorbent resin such as SAP, which is a hydrophilic polymer having a crosslinked structure capable of absorbing and retaining the fiber, is retained.

In the diaper 1 configured as described above, when the liquid is excreted from the wearer, the discharged liquid comes into contact with the absorber 6C via the top sheet 7. As a result, the absorber 6C absorbs the liquid discharged from the wearer and preferably suppresses the liquid from leaking from the diaper 1 to the outside.

In such a manufacturing process of the diaper 1, for example, the above-mentioned liquid adhesion method can be used. For example, in the step of producing the absorber 6C, the above-mentioned liquid adhesion method may be used for the material for the absorber 6C. According to the method for manufacturing the diaper 1 using the above-mentioned liquid adhesion method, the liquid can be adhered to the material for the absorber 6C with a predetermined adhesion amount and adhesion width.

<Other embodiments>
Although the embodiments of the present invention have been described above, the various embodiments described above can be combined as much as possible. Further, in the above embodiment, the control device M3 adjusts the spray pressure of the nozzle 200 according to the transfer speed of the transfer line, and adjusts the adhesion width of the liquid according to the spray pressure of the nozzle 200. Is not limited to this. For example, even if a factory worker adjusts the spray pressure of the nozzle 200 according to the transport speed of the transport line and adjusts the liquid adhesion width according to the spray pressure of the nozzle 200 by the method of Specific Examples 1 to 5. good. Further, the absorbent body 6C of the diaper 1 manufactured by using the above manufacturing method may have a structure in which an absorbent core made of a fiber material is laminated in two layers. In this case, SAP particles may be sprinkled on the lower absorption core. By adhering a liquid such as water to the material for the absorption core in the lower layer, the SAP particles can be retained on the material.

1 ... diaper 1B ... inseam area 1F ... front body area 1R ... back body area 2F ... front patch 2L, 2R ... tape 3BL, 3BR ... 3D gather 3R ... waist gather 4 ... cover sheet 4KL , 4KR ... Constriction 5 ... Back sheet 6C ... Absorber 7 ... Top sheet 8L, 8R ... Side sheet 8KL, 8KR ... Constriction 4C, 4SL, 4SR, 8EL, 8ER, 9ER ...・ Manufacturing device M1 ・ ・ Transfer line M2 ・ ・ Liquid spraying device M3 ・ ・ Control device M4 ・ ・ Air injection device 200 ・ ・ Nozzle 301 ・ ・ Spray pressure adjustment unit 302 ・ ・ Adhesion width adjustment unit A ・ ・ Material L ・ ・liquid

Claims (9)

A liquid bonding method for adhering the liquid to the material by spraying the liquid from the liquid spraying device onto a material made of a fiber material transported in a fixed direction by the transport device.
The liquid sprayer has a nozzle for spraying the liquid.
Adjusting the spray pressure of the nozzle according to the transport speed of the transport device, and
Adjusting the adhesion width of the liquid according to the spray pressure,
Liquid adhesion method, including. The adhesion width is adjusted by the relative distance between the material and the nozzle.
The liquid adhesion method according to claim 1. The adhesion width is adjusted by the angle of the nozzle with respect to the vertical direction.
The liquid adhesion method according to claim 1. The adhesion width is adjusted according to the angle between the transport direction and the horizontal direction of the transport device.
The liquid adhesion method according to claim 1. The adhesion width is adjusted by tilting the widthwise end of the material inward or outward of the material.
The liquid adhesion method according to claim 1. The adhesion width is adjusted by injecting compressed air toward the liquid discharged from the nozzle.
The liquid adhesion method according to claim 1. Using a control device having a spray pressure adjusting unit that adjusts the spray pressure of the nozzle according to the transport speed of the transport device, and an adhesion width adjusting unit that adjusts the adhesion width of the liquid according to the spray pressure. Adjusting the adhesion width,
The liquid adhesion method according to any one of claims 1 to 6. A liquid adhesion step of adhering a liquid to the material used for an absorbent article by using the liquid adhering method according to any one of claims 1 to 7.
A method for manufacturing an absorbent article. A transport device that transports materials made of fiber materials in a certain direction,
A liquid spraying device having a nozzle for spraying the liquid and spraying the liquid toward the material on the transporting device.
A spray pressure adjusting unit that adjusts the spray pressure of the nozzle according to the transport speed of the transport device, and
An adhesion width adjusting unit that adjusts the adhesion width of the liquid according to the spray pressure,
A device for manufacturing absorbent articles.

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