JP7094240B2 - How to make an absorbent article - Google Patents

Description

The present invention relates to a method for producing an absorbent article.

Absorbent articles containing a coating liquid having a predetermined function (eg, deodorant, fragrance, modifier, antibacterial agent, warming agent, Chinese herbal medicine extractant) are known. As a method for continuously producing such an absorbent article, a method of applying a coating liquid along the transport direction on a continuous sheet member extending in the transport direction is known. For example, Patent Document 1 discloses a method of spraying a coating liquid (antibacterial agent) diluted with a solvent such as water or alcohol onto a continuous sheet member (base material) extending in the transport direction.

Japanese Unexamined Patent Publication No. 2017-6505

The absorbent article may have a coating liquid that is liquid at room temperature, particularly a coating liquid that contains a hard-to-evaporate agent, rather than a coating liquid that contains an easily evaporable agent such as water or alcohol. When continuously producing such an absorbent article, it is conceivable to use the method of Patent Document 1 as a method of applying the coating liquid. However, in that method, a situation may occur in which the spray-like mist-like coating liquid adheres to a place different from a desired place in the continuous sheet member or a surrounding device. In that case, since the coating liquid contains an agent that is difficult to evaporate, it tends to stay in the place where it adheres without evaporating. Therefore, a place where the coating liquid is unnecessary in a continuous sheet member or another material for an absorbent article (hereinafter, also referred to as a “liquid unnecessary place”) after the coating liquid has adhered directly or to a surrounding device. There is a risk that it will adhere to the liquid and remain in the unnecessary parts of the liquid. In that case, there is a possibility that the function of the product may be deteriorated due to the influence of the coating liquid in the place where the liquid is unnecessary. Further, instead of applying the coating liquid by spraying, it is conceivable to apply the coating liquid by pouring it off from a predetermined distance above the continuous sheet member. However, even in that case, as in the case of spraying, the coating liquid may flow out or bounce from the coated area on the surface of the continuous sheet member, and may be different from the desired location such as the continuous sheet member or the surrounding area. There is no change in the possibility of sticking to the device.

Therefore, an object of the present invention is to prevent the coating liquid from adhering to unnecessary liquid parts in the material of the absorbent article when the liquid coating liquid for the absorbent article is applied in the method for producing the absorbent article. Is to provide a possible way.

The absorbent article of the present invention comprises a first sheet member, a coating liquid applied to one surface of the first sheet member, and a web member adjacent to the coating liquid on the first sheet member. A method of manufacturing an absorbent article to be provided, in which the coating liquid, which is a liquid at room temperature, is contact-coated on one surface of the first continuous sheet member for the first sheet member extending along the transport direction. The coating step is provided with a mounting step of mounting the web member on the surface of the first continuous sheet member having the coating liquid, and after the coating step, one of the first continuous sheet members. A method comprising a non-contact transfer step of transporting the coating liquid on a surface to the previously described placement step without contacting the other members and devices for the absorbent article.

INDUSTRIAL APPLICABILITY According to the present invention, in a method for manufacturing an absorbent article, when a liquid coating solution for an absorbent article is applied, it is possible to prevent the coating solution from adhering to unnecessary liquid parts in the material of the absorbent article. Become.

It is a top view which shows the structural example of the menstrual napkin which concerns on embodiment. It is a schematic diagram which shows the arrangement example of the coating liquid of the liquid permeability sheet which concerns on embodiment. It is a schematic diagram which shows the other arrangement example of the coating liquid of the liquid permeability sheet which concerns on embodiment. It is a schematic diagram which shows the manufacturing method of the menstrual napkin which concerns on embodiment. It is a schematic diagram which shows the example of the structure and operation of the coating apparatus which concerns on embodiment. It is a schematic diagram which shows the example of the pattern of the coating liquid which concerns on embodiment. It is a schematic diagram which shows the example of the structure and operation of the transfer apparatus which concerns on embodiment.

Specifically, the disclosure of the present invention relates to the following aspects.
[Aspect 1]
A method for producing an absorbent article comprising a first sheet member, a coating liquid applied to one surface of the first sheet member, and a web member adjacent to the coating liquid on the first sheet member. The coating step of contact-coating the coating liquid, which is a liquid at room temperature, onto one surface of the first continuous sheet member for the first sheet member extending along the transport direction, and the first step. A mounting step of placing the web member on the surface of the continuous sheet member having the coating liquid is provided, and after the coating step, the coating liquid on the one surface of the first continuous sheet member is applied. A method comprising a non-contact transfer step of transporting to the above-mentioned setting step without contacting with other members and devices for the absorbent article.

In this method, in the coating step, a coating liquid that is liquid at room temperature is applied to one surface of the first continuous sheet member (example: deodorant, fragrance, modifier, antibacterial agent, warming agent, Chinese herbal medicine extractor). Is contact-coated at room temperature. That is, the coating liquid is applied to the first continuous sheet member so as to come into contact with one surface of the first continuous sheet member immediately after the coating liquid is delivered from the coating device. Therefore, the coating liquid tends to stay in the coating region of the first continuous sheet portion, that is, in a desired portion of the first continuous sheet member. Thereby, in the coating step, it is possible to prevent the coating liquid from adhering to a place different from a desired place on the first continuous sheet member or a surrounding device.
Further, in the non-contact transfer step, the coating liquid on the first continuous sheet member does not come into contact with other members and devices for absorbent articles after the coating step and before the mounting step. That is, the coating liquid on the first continuous sheet member does not come into contact with other members and devices before the upper surface thereof is covered with the web member. Therefore, it is possible to prevent the coating liquid on the first continuous sheet member from adhering to a portion (liquid-unnecessary portion) where the coating liquid is unnecessary in the first continuous sheet member or other materials for absorbent articles.
That is, in the method for producing an absorbent article, it is possible to suppress the adhesion of the coating liquid to a liquid-unnecessary portion in the absorbent article regardless of whether or not the coating liquid has an agent that is difficult to evaporate. .. As a result, it is possible to suppress a situation in which the function of the product is deteriorated.

[Aspect 2]
The method according to aspect 1, wherein the first sheet member and the first continuous sheet member are formed of an aggregate of fibers.
In this method, the first sheet member and the first continuous sheet member are formed of an aggregate of fibers (example: cloth (nonwoven fabric, woven fabric, knitted fabric, etc.)). Therefore, when the coating liquid is contact-coated, at least a part of the coating liquid can be diffused inside the aggregate of fibers. As a result, the coating liquid tends to stay in the coating region of the first continuous sheet portion, that is, at a desired location in the first continuous sheet member. As a result, it is possible to prevent the coating liquid from moving to and adhering to the liquid-unnecessary portion of the first continuous sheet member.

[Aspect 3]
The aggregate of the fibers is a nonwoven fabric, and the nonwoven fabric has a net surface that was in contact with the net-like support at the time of entanglement and a non-net surface opposite to the net surface. The method according to aspect 2, comprising a step of contact-coating the coating liquid on the non-woven fabric surface of the first continuous sheet member.
In this method, the coating liquid is contact-coated on the non-net surface of the first continuous sheet member which is a non-woven fabric. That is, the coating liquid is applied not to the net surface having a high fiber density but to the non-net surface having a low fiber density in the first continuous sheet member. Therefore, it is possible to prevent the coating liquid from diffusing in the plane direction (transportation direction and transverse direction) of the nonwoven fabric. Therefore, the coating liquid can be easily retained in the coating region of the first continuous sheet portion, that is, at a desired location in the first continuous sheet member. As a result, it is possible to prevent the coating liquid from moving to and adhering to the liquid-unnecessary portion of the first continuous sheet member.

[Aspect 4]
The absorbent article further comprises a second sheet member that is overlapped with the first sheet member with the web member interposed therebetween, and in the coating step, the coating liquid is applied to the one surface of the first continuous sheet member. Is intermittently contact-coated in the transport direction to form a coating region to which the coating liquid is applied and a non-coating region to which the coating liquid is not applied. The method includes the step of placing the web member on the coating region, and the method sandwiches the web member with a second continuous sheet member for the second sheet member extending along the transport direction. 1 to further comprising a joining step of arranging the first continuous sheet member so as to overlap with the first continuous sheet member and joining the first continuous sheet member and the second continuous sheet member at a position corresponding to the non-applied region. The method according to any one of 3.
In this method, the coating liquid is intermittently contact-coated on one surface of the first continuous sheet member in the transport direction to form a coated region and a non-coated region. Therefore, the coating liquid tends to stay in the coating region and is difficult to be arranged in the non-coating region. Therefore, in this method, the first continuous sheet member and the second continuous sheet member are joined in a non-applied region intermittently arranged in the transport direction, that is, in a region where no coating liquid is present to form a seal portion. be able to. As a result, it is possible to prevent the coating liquid and the sealing portion between the continuous sheet members from overlapping each other and weakening the bonding strength of the sealing portion.

[Aspect 5]
In the coating step, the coating liquid is intermittently contact-applied to the one surface of the first continuous sheet member in the transport direction and the transverse direction orthogonal to the transport direction to obtain the coating region and the coating region. The method according to aspect 4, comprising a step of forming a non-coated region.
In this method, the coating liquid is intermittently contact-coated on one surface of the first continuous sheet member in the transport direction and the transverse direction to form a coated region and a non-coated region. Therefore, in this method, the first continuous sheet member and the second continuous sheet member are more reliably joined in a non-applied region that is intermittently arranged in the transport direction and the transverse direction, that is, a region in which the coating liquid does not exist. , A seal portion can be formed. As a result, it is possible to further prevent the coating liquid and the sealing portion between the continuous sheet members from overlapping each other and weakening the bonding strength of the sealing portion.

[Aspect 6]
The coating step is a step of preparing a coating device for contact-coating the coating liquid on the first continuous sheet member, and the coating device conveys the first continuous sheet member along the outer peripheral surface. The rotary roll includes, and a nozzle for delivering the coating liquid toward the outer peripheral surface, the rotary roll has concave portions and convex portions alternately arranged in the circumferential direction on the outer peripheral surface. Has an outlet for the coating liquid arranged close to the outer peripheral surface, and the outlet has a gap between the convex portion and the concave portion, which is narrower than the gap between the convex portion and the concave portion. When the concave portion passes in front of the delivery port, the coating liquid is delivered from the delivery port, and the convex portion passes in front of the delivery port. The method according to aspect 4 or 5, comprising a step of contact-applying the delivered coating liquid to the first continuous sheet member.
In this method, when the concave portion passes in front of the delivery port, that is, when the gap between the delivery port and the first continuous sheet member is large, the coating liquid is delivered from the delivery port, and the convex portion passes in front of the delivery port. That is, when the gap between the delivery port and the first continuous sheet member is small, the delivered coating liquid is applied to the first continuous sheet member. Therefore, the coating liquid can be more reliably contact-applied to the region corresponding to the convex portion in the first continuous sheet member, that is, the coating region. As a result, it is possible to prevent the coating liquid from moving to and adhering to the liquid-unnecessary portion of the first continuous sheet member.

[Aspect 7]
The method according to aspect 6, wherein the rotary roll includes a suction port for sucking the first continuous sheet member to the outer peripheral surface on the downstream side of the convex portion on the outer peripheral surface.
In this method, since the suction port for sucking the first continuous sheet member is included on the downstream side of the convex portion on the outer peripheral surface, the first continuous sheet member has a shape on the downstream side of the convex portion, that is, a shape on the upstream side of the concave portion. Can be surely followed. Thereby, the coating liquid can be more reliably applied to the region corresponding to the convex portion in the first continuous sheet member, and can be more reliably not applied to the region corresponding to the concave portion. As a result, it is possible to prevent the coating liquid from adhering to the liquid-unnecessary portion of the first continuous sheet member.
[Aspect 8]
The non-contact transfer step includes a step of transporting the non-applied region of the first continuous sheet member to the above-mentioned placement step while sucking from the other surface of the first continuous sheet member, aspects 4 to 7. The method described in any one of the above.
In the process of manufacturing the absorbent article, as a method of stably transporting the first continuous sheet member, there is a case where the method of transporting the first continuous sheet member while sucking from the other surface of the first continuous sheet member is adopted. Therefore, in this method, the first continuous sheet member is conveyed while sucking the non-coated region on one surface of the first continuous sheet member from the other surface. That is, the region sucked during transportation does not overlap the coating region. Therefore, the coating liquid applied to one surface of the first continuous sheet member is sucked from the other surface immediately after application and diffuses in the plane direction (transportation direction and transverse direction) or the thickness direction. It is possible to suppress the situation where it ends up. As a result, it is possible to prevent the coating liquid from adhering to the liquid-unnecessary portion of the first continuous sheet member.

[Aspect 9]
The non-contact transfer step includes a step of transporting the coating region of the first continuous sheet member to the above-mentioned placement step while sucking from the other surface of the first continuous sheet member, according to aspects 4 to 7. The method described in any one of the items.
In the process of manufacturing the absorbent article, as a method of stably transporting the first continuous sheet member, there is a case where the method of transporting the first continuous sheet member while sucking from the other surface of the first continuous sheet member is adopted. Therefore, in this method, the first continuous sheet member is conveyed while sucking the coating region on one surface of the first continuous sheet member from the other surface. That is, the region sucked during transportation overlaps the coating region. Therefore, the coating liquid applied to one surface of the first continuous sheet member is sucked during transportation immediately after coating, so that the coating liquid can be held in the coating region. As a result, it is possible to prevent the coating liquid of the first continuous sheet member from diffusing in the plane direction (transportation direction and transverse direction) during transportation.

Hereinafter, a method for producing an absorbent article containing a coating liquid according to an embodiment will be described with reference to a warming agent as an example of the coating liquid and a sanitary napkin as an example of the absorbent article. However, the coating liquid and the absorbent article are not limited to these examples, and other absorbent articles containing other coating liquid may be used as long as the gist of the present invention is not deviated. Examples of such other coating liquids include deodorants, fragrances, modifiers, antibacterial agents, and Chinese herbal medicine extractants. Also, such absorbent articles include, for example, menstrual napkins, panty liners, incontinence pads, and disposable diapers.

The configuration of the menstrual napkin 1 according to the present embodiment will be described. FIG. 1 is a plan view showing a configuration example of a liquid permeable sheet according to a menstrual napkin 1. The menstrual napkin 1 has a longitudinal direction L, a width direction W, and a thickness direction T orthogonal to each other. In the menstrual napkin 1 drawn in FIG. 1, the upper side of the figure is the front side (front side) or the ventral side of the longitudinal direction L, and the lower side of the figure is the rear side (rear side) or the dorsal side of the longitudinal direction L. The view of the menstrual pad 1 placed on the plane including the longitudinal direction L and the width direction W from the upper side in the thickness direction T is called "planar view", and the shape grasped in the plan view is called "planar shape". Any direction in the plane including the longitudinal direction L and the width direction W is referred to as a "planar direction". When the wearer wears the menstrual napkin 1, the sides relatively close to and far from the skin surface of the wearer in the thickness direction T are referred to as "skin side" and "non-skin side", respectively. These definitions are also commonly used for each material of the menstrual napkin 1.

The menstrual napkin 1 has a generally general shape of a menstrual napkin (eg, a rectangle whose short side has an outwardly convex curve) and absorbs body fluid (eg, menstrual blood) which is excrement. The absorption main body 1a and a pair of wing portions 6 and 6 extending to both outer sides of the absorption main body 1a in the width direction W are provided. In another embodiment, the menstrual napkin 1 does not include a pair of wing portions 6, 6. In yet another embodiment, the sanitary napkin 1 is located on at least one of the anterior and posterior sides of the absorption body 1a in the longitudinal direction L and further comprises a functional body containing a warming agent or a cooling sensation agent.

In the menstrual napkin 1, the longitudinal center line CL (virtual line) extending in the longitudinal direction L through the center of the width direction W and the center of each of the pair of wing portions 6 and 6 in the longitudinal direction L are connected in the width direction W. It has a center line CW (virtual line) in the width direction. In the menstrual napkin 1, the directions and sides toward the center line CL in the longitudinal direction are the inward and inside of the width direction W, respectively, and the directions and sides away from each other are the outward and outside of the width direction W, respectively. On the other hand, the directions and sides toward the center line CW in the width direction are defined as inward and inside of the longitudinal direction L, respectively, and the directions and sides toward the distance are defined as outward and outward in the longitudinal direction L, respectively. These definitions are also commonly used for each material of the menstrual napkin 1. However, when the wing portion 6 does not exist, the width direction center line CW is a line extending in the width direction W through the center of the excretion port contact area in the absorption main body 1a in the longitudinal direction L. In this embodiment, the two are the same. The excretion port contact area is an area where the excretion port abuts when the menstrual napkin 1 is worn. For example, in the longitudinal direction L, about 1/4 of the total length of the absorber 4 is slightly forward of the center of the absorber 4. The length is about 2/3, and the width is about 1/3 to 3/4 of the total length of the absorber 4 in the center of the absorber 4 in the width direction W.

The menstrual napkin 1 includes a liquid permeable sheet 2 that comes into contact with the wearer's skin when worn, a liquid permeable sheet 3 that comes into contact with clothing (underwear) when worn, a liquid permeable sheet 2, and a liquid permeable sheet. It is provided with an absorber 4 arranged between the three. The absorber 4 comprises an absorbent core containing pulp fibers and superabsorbent polymer particles and a core wrap (not shown). In another embodiment, the absorber 4 does not include a core wrap. The liquid permeable sheet 2, the liquid permeable sheet 3, and the absorber 4 can be said to be examples of the first sheet member, the second sheet member, and the web member, respectively, but the first sheet member, the second sheet member, and the web are used. The member may be another material used in the absorbent article.

The liquid permeable sheet 2 includes a surface sheet 2a and a pair of side sheets 2b and 2b bonded to both sides of the surface sheet 2a in the width direction W. The dimension of the surface sheet 2a in the width direction W is approximately the same as the dimension of the absorber 4 in the width direction W. Each side sheet 2b includes a leak-proof wall 2W located at the inner end of the width direction W and extending along the longitudinal direction L. That is, the liquid permeable sheet 2 includes a pair of leakage-proof walls 2W and 2W. In another embodiment, the liquid permeable sheet 2 does not have a pair of side sheets 2b and 2b, and the entire surface is a surface sheet. In yet another embodiment, the liquid permeable sheet 2 does not have a pair of leakproof walls 2W, 2W. In yet another embodiment, the menstrual napkin 1 further comprises a liquid diffusion sheet that is abutted against the non-skin side of the surface sheet 2a and diffuses excrement in a planar direction.

In the present embodiment, the liquid permeable sheet 2 (first sheet member) further contains a warming agent 10 as a coating liquid. FIG. 2 is a schematic view showing an arrangement example of the warming agent (coating liquid) 10 of the liquid permeable sheet 2 according to the embodiment. FIG. 2 shows the non-skin side surface of the liquid permeable sheet 2. The warming agent 10 is arranged on the non-skin side surface of the liquid permeable sheet 2 in a plurality of strip-shaped (continuous or intermittent) regions extending in the longitudinal direction L and arranged at intervals in the width direction W. (Striped pattern). In this case, the range of the longitudinal direction L and the width direction W in which the warming agent 10 is arranged is generally within the range of the longitudinal direction L and the width direction W of the absorber 4 (or the surface sheet 2a). The region where the warming material 10 is arranged in the liquid permeable sheet 2 can be said to be a region to which the warming agent 10 is applied, that is, a coating region of the coating liquid. Further, the region of the liquid permeable sheet 2 where the warming material 10 is not arranged can be said to be a region where the warming agent 10 is not applied, that is, a region where the coating liquid is not applied.

The warming agent 10 stimulates the temperature receptor (heat sensory receptor) of the skin without heating the body of the wearer of the menstrual napkin 1 or its vicinity thereof, and causes the wearer to perceive the warmth. It contains a warming component and further contains a solvent component capable of dissolving or dispersing the warming component. Although the warming agent 10 is a liquid at room temperature, it can diffuse and move from the arranged place in the form of a liquid or a gas due to the influence of temperature, atmospheric pressure, external force, excrement and the like. Even if the warming agent 10 is arranged on the non-skin side of the liquid permeable sheet 2, the warming agent 10 permeates the liquid permeable sheet 2 by elution, diffusion, etc., for example, when the menstrual napkin 1 is worn, and the wearer Can touch the skin of the lower abdomen. Thereby, the warming component of the warming agent 10 can stimulate the heat sensory receptor of the skin and give a warm feeling to the lower abdomen of the wearer. In another embodiment, the warming agent 10 is placed at yet another location on the liquid permeable sheet 2, such as the surface on the skin side. In yet another embodiment, the warming agent 10 is placed on the non-skin side or skin side surface of the absorber 4 or the liquid diffusion sheet instead of the liquid permeable sheet 2 or in addition to the liquid permeable sheet 2. To.

The warming agent 10 of the sanitary napkin 1 having the arrangement shown in FIG. 2 transports the liquid permeable sheet 2 (first sheet member) so that the longitudinal direction L is parallel to the transport direction (longitudinal flow). It is arranged by applying the warming agent 10 to the permeable sheet 2. However, the arrangement of the warming agent 10 is not limited to the arrangement example of FIG. 2, and may be another arrangement. FIG. 3 is a schematic view showing another arrangement example of the warming agent (coating liquid) 10a of the liquid permeable sheet 2 according to the embodiment. The warming agent 10a of the menstrual pad 1'extended in the width direction W on the non-skin side surface of the liquid permeable sheet 2 and is arranged in a plurality of strips (continuous or intermittent) at intervals in the longitudinal direction L. It is placed at the target) position. The warming agent 10a is applied to the liquid permeable sheet 2 while transporting (cross-flowing) the liquid permeable sheet 2 (first sheet member) so that the width direction W is parallel to the transport direction. By doing so, it will be placed. The shape and arrangement of the warming agent 10 are arbitrary.

The menstrual napkin 1 has a plurality of pressing portions 7, 8. The plurality of pressing portions 7 are arranged in a curved shape continuously or intermittently so as to surround the excretion opening contact area. The plurality of squeezed portions 8 are arranged in a dot-like manner in a region surrounded by the plurality of squeezed portions 7. The squeezed portions 7 and 8 are formed by squeezing the liquid permeable sheet 2 and the absorber 4 from the skin side to the non-skin side. The shape and arrangement of the plurality of squeezed portions 7 and 8 are arbitrary. In another embodiment, the squeezing portions 7 and 8 are not arranged.

The menstrual napkin 1 also has a sealing portion 9 that borders the circumference of the menstrual napkin 1. The sealing portion 9 joins and seals the liquid permeable sheet 2 and the liquid impermeable sheet 3 at their peripheral edges by a known method such as heat sealing (heat fusion) and / or squeezing (crimping). .. In the sanitary napkin 1, the non-skin side surface of the liquid permeable sheet 2 and the skin side surface of the absorber 4 are bonded with an adhesive (not shown), and the non-skin side surface of the absorber 4 and the liquid are joined. It is joined to the skin-side surface of the impermeable sheet 3 with an adhesive (not shown). The sealing portion 9 may contain an adhesive (eg, hot melt adhesive).

The menstrual napkin 1 includes an adhesive portion (not shown) for fixing the menstrual napkin 1 to the wearer's clothes. One surface of the adhesive portion is fixed to the liquid-impermeable sheet 3, and the other surface is temporarily fixed to the individual packaging sheet (not shown) of the menstrual napkin 1. For example, in a plan view, an adhesive portion located in a region overlapping the absorber 4 and extending along the longitudinal direction L and an adhesive portion located in a region overlapping the wing portion 6 and extending along the longitudinal direction L are arranged. Will be done. In another embodiment, the other surface of the adhesive portion is temporarily fixed to the release sheet fixed to the individual wrapping sheet.

In the sanitary napkin 1 of the present embodiment, the warming agent 10 (coating liquid) of the liquid permeable sheet 2 is a warming component that activates a TRP channel (temperature receptor (heat sensory receptor)) and a solvent component. And include. Therefore, when the menstrual napkin 1 is fixed to the clothes and used, the warming agent 10 of the liquid permeable sheet 2 permeates the liquid permeable sheet 2 and comes into contact with the wearer's skin. Therefore, on the wearer's skin, the TRP channel of the warming agent contact portion in contact with the warming component can be efficiently activated, and the warming feeling can be efficiently imparted to the wearer's lower abdomen.

By imparting a warm sensation to the wearer's lower abdomen, the TRP channel of the warming agent contact portion that was in contact with the warm sensation component in the skin of the wearer's lower abdomen is activated, and as a result, via the sympathetic nervous system. It can be expected that heat is generated from the contact portion of the warming agent and the temperature of the contact portion of the warming component on the wearer's skin is raised. As a result, it is expected to warm the part near the uterus of the wearer, excrete the pain substance prostaglandin, and relieve the wearer's menstrual pain. By warming the part of the wearer near the uterus, it is expected to reduce the wearer's Premenstrual Syndrome, poor circulation, and menopausal disorders. By promoting blood circulation (promoting lymphatic flow), it is expected that waste products will be discharged, coldness will be improved, fat burning will be improved, and immunity will be improved.

In the menstrual napkin 1 of the present embodiment, a warming agent 10, that is, a warming agent containing a warming component is used as the coating liquid. However, the present invention is not limited to this example, and the type of the coating liquid may be another type depending on the function to be imparted to the sanitary napkin 1. Types of coating liquid include, for example, a cooling sensation agent containing a cooling sensation component, a heating agent containing a heat generating component, a deodorant containing a deodorizing component, a fragrance containing a scent component, and a component that modifies fibers such as a durable hydrophilic oil agent. Examples thereof include a modifier containing the above, an antibacterial agent containing a component that suppresses the growth of bacteria, and a Chinese herbal medicine extractant containing a component of a crude drug.

Next, an example of the method for producing the menstrual napkin 1 according to the embodiment will be described. FIG. 4 is a schematic diagram showing an example of a method for producing a menstrual napkin 1 according to an embodiment. The manufacturing apparatus 200 has a transport direction MD, a transverse direction CD, and a vertical direction TD for transporting materials such as sheet members for menstrual napkin 1 and semi-finished products. In the present embodiment, the longitudinal direction L, the width direction W, and the thickness direction T of the sanitary napkin 1 are the same as the longitudinal direction, the width direction, and the thickness direction of the material or semi-finished product for the sanitary napkin 1, respectively. It is the same as the transport direction MD, the transverse direction CD, and the vertical direction TD, respectively. In this manufacturing method, an example will be described in which the liquid permeable sheet 2 of the menstrual napkin 1 does not have a side sheet, is composed of only a surface sheet, and does not have the pressing portions 7 and 8.

As shown in FIG. 4, first, the first continuous sheet member 102 for the liquid permeable sheet 2 (first sheet member) is rewound from the roll WR2 by a transport roll or the like, is transported in the transport direction MD, and is coated. It is supplied to the device 210. Here, the coating device 210 sends out the rotary roll 211 for transporting the first continuous sheet member 102 along the outer peripheral surface and the warming agent 10 (coating liquid) toward the outer peripheral surface of the rotary roll 211. Includes nozzle 212 and. Then, on the outer peripheral surface of the rotary roll 211, the warming agent 10 which is liquid at room temperature is contact-coated on one surface of the first continuous sheet member 102 by the nozzle 212 (coating step). That is, the warming agent is applied to the first continuous sheet member 102 so as to come into contact with one surface of the first continuous sheet member 102 immediately after being delivered from the nozzle 212. Therefore, the warming agent 10 can easily stay in the coating region of the first continuous sheet member 102, that is, in a desired portion. At this time, the warming agent is contact-applied to one surface of the first continuous sheet member 102 in a predetermined pattern (eg, a stripe pattern intermittently extended in the transport direction MD). However, in this embodiment, the normal temperature means 10 to 40 ° C. The liquid has a viscosity at room temperature (example: 25 ° C.) of more than 0 and 300 mPa · s or less, preferably more than 0 and 200 mPa · s or less, more preferably more than 0 and 100 mPa · s. It shall be as follows. The contact coating means that the distance between the tip of the nozzle 212 and the surface of the first continuous sheet member 102 on the outer peripheral surface of the rotary roll 211 is 0 to 5 mm. When the distance between the tip of the nozzle 212 and the surface of the first continuous sheet member 102 is 0 mm and the first continuous sheet member 102 (liquid permeable sheet 2) is a non-woven fabric, the warming agent 10 is applied to the first continuous sheet member 102. It is preferable because it can be rubbed inside.

An example of the coating process will be specifically described. FIG. 5 is a schematic diagram showing an example of the configuration and operation of the coating device 210 according to the embodiment. 5 (a) to 5 (c) show a state before the warming agent 10 is applied to the first continuous sheet member 102, a state during application, and a state after application, respectively. ..

The rotary roll 211 of the coating device 210 has concave portions 211L and convex portions 211H alternately arranged in the circumferential direction on the outer peripheral surface 211S, and the difference in height between the concave portions 211L and the convex portions 211H from the outer peripheral surface 211S. d _H is configured to be larger than the thickness of the first continuous sheet member 102. The height difference dH between the concave portion 211L and the convex portion 211H from the outer peripheral surface _211S is, for example, 1 to 10 mm, preferably 2 to 5 mm. The rotary roll 211 conveys the first continuous sheet member 102 along the surface 211SL of the concave portion 211L of the outer peripheral surface 211S and the surface 211SH of the convex portion 211H. At this time, on the rotary roll 211, one surface 102S1 of the first continuous sheet member 102 is exposed, and the other surface 102S2 is in contact with the outer peripheral surface 211S. On the outer peripheral surface 211S, a plurality of suction ports 211t that communicate with the inside of the rotary roll 211 and have a suction function are formed. The plurality of suction ports 211t attract the first continuous sheet member 102 along the surface 211SL of the concave portion 211L of the outer peripheral surface 211S and the surface 211SH of the convex portion 211H. The plurality of suction ports 211t are dispersedly arranged in the concave portion 211L and the convex portion 211H on the outer peripheral surface 211S, and are arranged in a relatively large number in the boundary between the concave portion 211L and the convex portion 211H, for example, the upstream side and the downstream side region of the convex portion 211H. Will be done. This is to appropriately align the first continuous sheet member 102 with the outer peripheral surface 211S.

In this embodiment, the rotary roll 211 is made of an oil resistant material (eg, stainless steel). This is to prevent deterioration by the warming agent 10. Further, the outer peripheral surface 211S is covered with an elastic member (example: resin). In order to properly hold the first continuous sheet member 102, that is, to prevent it from slipping, and to receive the pressure of the warming agent 10 sent from the nozzle 212 or the nozzle 212 by the elastic force of the elastic member, the first continuous sheet member 102. This is to prevent the member 102 from being damaged. In another embodiment, in order to more appropriately hold the first continuous sheet member 102, that is, to hold it so as not to slip, the surface 211SH of the convex portion 211H is formed with fine irregularities. The difference in height between the fine concave and convex is, for example, 0.01 to 0.1 times the height difference d _H between the concave portion 211L and the convex portion 211H from the outer peripheral surface 211S.

The nozzle 212 of the coating device 210 has a delivery port 212a of the warming agent 10 arranged in the vicinity of the outer peripheral surface 211S, and the gap between the delivery port 212a and the surface 211SH of the convex portion 211H is the delivery port 212a. It is configured to be narrower than the gap between the recess 211L and the surface 211SL of the recess 211L. The gap between the delivery port 212a and the surface 211SH of the convex portion 211H is, for example, 0.5 to 10 mm, preferably 1 to 5 mm. The gap between the delivery port 212a and the surface 211SL of the recess 211L is, for example, 1.5 to 20 mm, preferably 3 to 10 mm.

Before the warming agent 10 is applied to the first continuous sheet member 102, the outlet 212a of the nozzle 212 is located above the recess 211L, as shown in FIG. 5A. Although the warming agent 10 starts to be delivered from the delivery port 212a, it does not flow downward and is held by the delivery port 212a due to surface tension or the like. At this time, the distance d1 between the delivery port 212a and one surface 102S1 of the first continuous sheet member 102 on the surface 211SL of the recess 211L is in a state of being sent from the delivery port 212a but being held (hanging down). It is longer than the length of the warming agent 10. Therefore, the warming agent 10 delivered from the delivery port 212a does not come into contact with one surface 102S1 of the first continuous sheet member 102 and is therefore not applied. The distance d1 is, for example, 1 to 14 mm, preferably 2 to 8 mm. From this state, when the rotary roll 211 rotates relative to the nozzle 212 (rotates counterclockwise in FIG. 5), the nozzle 212 reaches above the convex portion 211H.

In the state where the warming agent 10 is being applied to the first continuous sheet member 102, the outlet 212a of the nozzle 212 is located above the convex portion 211H, as shown in FIG. 5B. At this time, the distance d2 between the delivery port 212a and one surface 102S1 of the first continuous sheet member 102 on the surface 211SH of the convex portion 211H is smaller than the distance d1 (d2 <d1). This distance d2 is shorter than the length of the warming agent 10 delivered from the delivery port 212a but held (hanging down). Therefore, the warming agent 10 delivered from the delivery port 212a is in contact with and therefore applied to one surface 102S1 of the first continuous sheet member 102. That is, the warming agent 10 is contact-applied to one surface 102S1 of the first continuous sheet member 102. At this time, the warming agent 10 is contact-coated by the rotation of the rotary roll 211 over substantially the entire region held on the surface 211SH of the convex portion 211H on one surface 102S1 of the first continuous sheet member 102. Therefore, the position and shape of the convex portion 211H on the outer peripheral surface 211S are formed corresponding to the position and shape of the region to which the warming agent 10 is applied, that is, the coating region in the first continuous sheet member 102. can. Further, the position and shape of the transverse CD of the nozzle 212 (the delivery port 212a) correspond to the region where the warming agent 10 is applied in the first continuous sheet member 102, that is, the position and shape of the transverse CD in the coating region. It can be said that it is formed. Alternatively, the position and shape of the transverse CD of the nozzle 212 (delivery port 212a) is formed corresponding to the position and shape of the convex portion 211H formed corresponding to the position and shape of the coating region. You can also. The distance d2 is, for example, 0 to 4 mm, preferably 0 to 3 mm. From this state, when the rotary roll 211 rotates relative to the nozzle 212 (rotates counterclockwise in FIG. 5), the nozzle 212 reaches above the recess 211L.

In the state after the warming agent 10 is applied to the first continuous sheet member 102, the outlet 212a of the nozzle 212 is located above the recess 211L again, as shown in FIG. 5 (c). The delivery port 212a of the nozzle 212 is located above the recess 211L again. The warming agent 10 delivered from the delivery port 212a is held at the delivery port 212a by surface tension or the like without flowing downward. That is, the warming agent 10 does not come into contact with one surface 102S1 of the first continuous sheet member 102 and is therefore not applied. In this way, the warming agent 10 is applied to the application region of the first continuous sheet member 102 corresponding to one convex portion 211H.

FIG. 6 is a schematic diagram showing an example of the pattern of the warming agent 10 according to the embodiment. FIG. 6A is a view showing a state in which one surface 102S1 of the first continuous sheet member 102 is viewed from above in the vertical direction TD, and FIG. 6B is a diagram showing VIa-VIa of FIG. 6A. It is a cross-sectional view along a line. As shown in FIG. 6A, in this example, the warming agent 10 is contact-applied to the transport direction MD in an intermittent stripe pattern. That is, the warming agent 10 extends in the transport direction MD on one surface 102S1 of the first continuous sheet member 102, and is arranged at a plurality of intermittent band-shaped positions arranged in the transverse direction CD (intermittently). Striped pattern). The region where the warming agent 10 is arranged is the coated region CT, and the region where the warming agent 10 is not arranged is the non-applied region NCT. Therefore, at least in the transport direction MD, a coating region CT to which the warming agent 10 is applied and a non-applied region NCT to which the warming agent 10 is not applied are formed. In this case, the range of the transport direction MD and the transverse direction CD of the coating region CT is generally within the range of the transport direction MD and the transverse direction CD of the region where the absorber 4 is arranged. However, the shape of the coating area CT is arbitrary. In another embodiment, the warming agent 10 is continuously arranged in the transport direction MD.

Further, in the present embodiment, as shown in FIG. 6A, the first continuous sheet member 102 is formed of an aggregate of fibers (example: cloth (nonwoven fabric, woven fabric, knitted fabric, etc.)). Therefore, when the warming agent 10 is contact-applied, at least a part of the warming agent 10 can be diffused inside the aggregate of fibers. Further, in this example, the first continuous sheet member 102 is a non-woven fabric. Here, the nonwoven fabric has a net surface that was in contact with the net-like support at the time of entanglement and a non-net surface that is a surface opposite to the net surface, and the fiber density of the net surface is high and non-woven fabric. The fiber density on the net surface is low. One surface 102S1 of the first continuous sheet member 102 is a non-net surface, and the other surface 102S2 is a net surface. Therefore, the warming agent 10 is contact-coated on the non-net surface of the first continuous sheet member 102. That is, the warming agent 10 is applied to the surface of the first continuous sheet member 102 having a low fiber density. Therefore, the diffusion of the first continuous sheet member 102 in the plane direction (conveying direction MD and transverse direction CD) can be suppressed to a small value.

The depth (thickness) of the vertical TD diffusion of the warming agent 10 in the first continuous sheet member 102 is, for example, 5 to 50 μm from one surface 102S1 and preferably 10 to 40 μm. This thickness (depth) is, for example, 10 to 60%, preferably 20 to 50%, when the thickness of the warming agent 10 is 100%. Further, the thickness (depth) is, for example, 5 to 50%, preferably 10 to 40%, when the thickness of the first continuous sheet member 102 is 100%. Further, the thickness of the vertical TD in the region where the fiber density on the non-net surface side of the first continuous sheet member 102 is relatively small is, for example, 30 when the thickness of the first continuous sheet member 102 is 100%. -80%, preferably 40-70%.

As described above, in the coating step, the rotary roll 211 is rotated together with the first continuous sheet member 102, and when the recess 211L passes in front of the delivery port 212a of the nozzle 212, the warming agent 10 is delivered from the delivery port 212a. When the convex portion 211H passes in front of the delivery port 212a, the delivered warming agent 10 is contact-applied to the first continuous sheet member 102a. As a result, the warming agent 10 (coating region CT) is intermittently arranged (formed) in the transport direction MD. In the present embodiment, as shown in FIG. 6A, the warming agent 10 is applied in a two-row stripe pattern intermittently extending in the transport direction MD. Correspondingly, the concave portions 211L and the convex portions 211H of the rotary roll 211 are alternately arranged in the circumferential direction and extend in the axial direction of the rotary roll 211, and the outlet 212a of the nozzle 212 is in the transverse direction CD. They are placed side by side at two locations with a gap.

Next, as shown in FIG. 4, the first continuous sheet member 102a immediately after the warming agent 10 is applied is transported to the transport direction MD while being adsorbed by the transport belt of the transport device 252 having a suction function. FIG. 7 is a schematic diagram showing an example of the configuration and operation of the transport device 252. FIG. 7A shows a case where the first continuous sheet member 102a is conveyed by the transfer device 252, and FIG. 7B shows a case where the first continuous sheet member 102a is conveyed by the transfer device 252a which can be replaced with the transfer device 252. The case of doing is shown.

In the transport device 252, as shown in FIG. 7A, the suction port 262 for sucking the first continuous sheet member 102a does not overlap with the warming agent 10 of the first continuous sheet member 102a, that is, the coating region CT. Have been placed. Therefore, the transfer device 252 transfers the first continuous sheet member 102a in the transfer direction MD while sucking the non-applied region NCT in the first continuous sheet member 102a from the other surface 102S2 of the first continuous sheet member 102a. Therefore, immediately after the application of the warming agent 10 (without sandwiching another step), the warming agent 10 applied to one surface 102S1 of the first continuous sheet member 102a is sucked from the other surface during transportation. It is possible to suppress diffusion in the plane direction (conveying direction MD and transverse direction CD) or in the vertical direction TD.

In another embodiment, the transfer device 252 is replaced with the transfer device 252a. In that case, in the transport device 252a, as shown in FIG. 7B, the suction port 262a for sucking the first continuous sheet member 102a overlaps with the warming agent 10 of the first continuous sheet member 102a, that is, the coating region CT. It is arranged like this. Therefore, the transport device 252a transports the first continuous sheet member 102a in the transport direction MD while sucking the coating region CT in the first continuous sheet member 102a from the other surface 102S2 of the first continuous sheet member 102a. Therefore, immediately after the application of the warming agent 10 (without sandwiching another step), the warming agent 10 applied to one surface 102S1 of the first continuous sheet member 102a is sucked during transportation, so that the warming agent 10 is sucked. 10 can be held in the coating area CT.

The proper use of the transfer device 252 and the transfer device 252a can be determined, for example, by the transfer speed, the coating amount of the warming agent 10, the coating area, the viscosity, and the like. For example, if the warming agent 10 has a situation or property that makes it difficult to diffuse or move between the time when the warming agent 10 is applied and the time when the absorber 4 is placed (described later) (eg, the viscosity is relatively high), the warming agent 10 is transported. If the device 252 is selected and has a situation or property that facilitates diffusion and movement (eg, the viscosity is relatively low), the transfer device 252a may be selected.

In yet another embodiment, the transport device having a suction function overlaps with the warming agent 10 (coating region CT) of the first continuous sheet member 102a as a suction port for sucking the first continuous sheet member 102a. Have both of the things that don't.

Next, as shown in FIG. 4, the first continuous sheet member 102a is transported to the transport direction MD while being adsorbed by the transport belt of the transport device 252, and is supplied to the adhesive coating device 220. At that time, after the coating step, one surface 102S1 of the first continuous sheet member 102a does not come into contact with the other member and device for the menstrual napkin 1 at least until it is supplied to the adhesive coating device 220.

Next, the first continuous sheet member 102a is coated with an adhesive (example: hot melt adhesive) on one surface by an adhesive application device 220 in a predetermined pattern (example: spiral pattern). In the present embodiment, the first continuous sheet member 102a is continuously coated with the adhesive in the transport direction MD. As a result, the adhesive is also placed in the non-coated area NCT. At this time, the adhesive is applied to one surface of the first continuous sheet member 102a with the adhesive outlet of the adhesive application device 220 and one surface of the first continuous sheet member 102a separated from each other by a predetermined distance. Is applied. Therefore, the adhesive outlet of the adhesive application device 220 does not contact the one surface 102S1 of the first continuous sheet member 102a, and therefore does not contact the warming agent 10.

Next, the first continuous sheet member 102b coated with the adhesive is conveyed in the transfer direction MD by the transfer belt of the transfer device 252 or another transfer device (not shown), and is between the pair of transfer rolls 253 and 253. Is supplied to. At that time, after coating with the adhesive coating device 220, one surface 102S1 of the first continuous sheet member 102b is used for the sanitary napkin 1 until it is supplied between at least a pair of transport rolls 253 and 253. Do not touch the members and devices of.

Next, the individual absorbers 4 (web members) formed by a known method are transported in the transport direction MD by the transport belt of the transport device 251 and supplied between the pair of transport rolls 253 and 253. Then, the absorber 4 is mounted on one surface 102S1 (the warming agent 10 and the adhesive are present) of the first continuous sheet member 102b by the pair of transport rolls 253 and 253 (mounting step). In the present embodiment, the coating area CT of the first continuous sheet member 102b, that is, the warming agent 10 applied to a desired portion is covered and protected by the absorber 4. As a result, the warming agent 10 applied to the first continuous sheet member 102b can be prevented from adhering to other members and devices, and movement and diffusion can be suppressed. At this time, the warming agent 10 (or one surface 102S1) on the first continuous sheet members 102a and 102b does not come into contact with other members and devices for the menstrual napkin 1 after the coating step and before the mounting step. .. That is, the warming agent 10 on the first continuous sheet members 102a and 102b does not come into contact with other members and devices before the upper surface thereof is covered with the absorber 4 (web member). Therefore, the warming agent 10 can easily stay in the coating region CT of the first continuous sheet members 102a and 102b, that is, at a desired location.

Therefore, in the step of transporting the first continuous sheet member 102a and 102b between the application step and the mounting step, the warming agent 10 on the first continuous sheet member 102a is used as another member for the sanitary napkin 1. And it can be said that it is a non-contact transfer process of transporting without contacting the device. Since the adhesive does not move or diffuse after application and does not affect the movement or diffusion of the warming agent 10 even if it comes into contact with the warming agent 10, it is not included in other members.

Further, the second continuous sheet member 103 for the liquid impermeable sheet 3 (second sheet member) rewound from the roll WR3 is conveyed in the conveying direction MD by a conveying device (not shown), and the adhesive is used. It is supplied to the coating device 230. Then, the second continuous sheet member 103 is coated with an adhesive (example: hot melt adhesive) on one surface by the adhesive application device 230 in a predetermined pattern (example: spiral pattern). Next, the second continuous sheet member 103a coated with the adhesive is conveyed in the conveying direction MD by a conveying device (not shown).

Next, the second continuous sheet member 103a is transported in the transport direction MD by the transport device, and is supplied between the pair of transport rolls 253 and 253. Then, the second continuous sheet member 103a is placed on one surface 102S1 of the first continuous sheet member 102b on which the absorber 4 is placed by the pair of transport rolls 253 and 253. However, in the present embodiment, the pair of transport rolls 253 and 253 causes the first continuous sheet member 102b and the second continuous sheet member 103a to overlap the absorber 4 from both sides in the vertical direction TD, while the first continuous sheet member 102b, The absorber 4 and the second continuous sheet member 103a are sandwiched from both sides of the vertical TD. At this time, almost at the same time when one surface 102S1 of the absorber 4 is overlapped and adhered to one surface of the first continuous sheet member 102b, the other surface of the absorber 4 is placed on one surface of the second continuous sheet member 103a. Overlapping and glued. Therefore, in the present embodiment, in the mounting step, the absorber 4 is mounted on one surface 102S1 of the first continuous sheet member 102b, and the second continuous sheet member 103a is mounted on the absorber 4. It can also be said. In another embodiment, in the mounting step, the absorber 4 is mounted on one surface 102S1 of the first continuous sheet member 102b, and then the second continuous sheet member 103a is mounted on the absorber 4.

The semi-finished product P1 in which the first continuous sheet member 102b and the second continuous sheet member 103a are arranged so as to overlap with each other sandwiching the absorber 4 is transported in the transport direction MD by a transport device (not shown), and is a joining device. It is supplied to 240. The joining device 240 includes a heating roll 241 and an anvil roll 242. The semi-finished product P1 is sandwiched between the heating roll 241 and the anvil roll 242, and the first continuous sheet member 102b and the second continuous sheet member 103a are joined to each other at a position corresponding to the non-coated region NCT (joining step). .. By the joining, a seal portion 109 by heat sealing (heat fusion) is formed at a position corresponding to the non-coated region NCT. Therefore, it is possible to prevent the warming agent 10 from overlapping with the seal portion 109 of the first continuous sheet member 102b and the second continuous sheet member 103a. In another embodiment, the joining device 240 comprises a crimp roll and an anvil roll. Then, the semi-finished product P1 is sandwiched between the crimping roll and the anvil roll, and the first continuous sheet member 102b and the second continuous sheet member 103a are joined to each other at a position corresponding to the non-coated region NCT (joining step). .. By the joining, the sealing portion 109 by squeezing (crimping) is formed at the position corresponding to the non-applied region NCT.

The semi-finished product P2 in which the seal portion 109 is formed at the position corresponding to the non-applied region NCT is conveyed to the MD in the transport direction by the transport device 254, and the adhesive portion is joined to a predetermined place, and the peripheral portion is a menstrual napkin. It is cut into the shape of 1 to become a sanitary napkin 1.

As described above, the menstrual napkin 1 is manufactured.

In another embodiment, after the absorber 4 is mounted on the first continuous sheet member 102b (mounting step), the second continuous sheet member is mounted on the first continuous sheet member 102b on which the absorber 4 is mounted. Before the 103a is placed, the pressing portions 7 and 8 extending from the first continuous sheet member 102b to the absorber 4 are formed.

In this method, in the coating step, the warming agent 10 (coating liquid), which is a liquid at room temperature, is contact-coated on one surface 102S1 of the first continuous sheet member 102 at room temperature. That is, the warming agent 10 is applied to the first continuous sheet member 102 so as to come into contact with one surface 102S1 of the first continuous sheet member 102 immediately after the warming agent 10 is delivered from the nozzle 212 of the coating device 210. is doing. Therefore, the warming agent 10 tends to stay in the coating region CT of the first continuous sheet member 102, that is, at a desired position in the first continuous sheet member 102. As a result, it is possible to prevent the warming agent 10 from adhering to a place different from the desired place on the first continuous sheet member 102 or to a surrounding device.
Further, in the non-contact transfer step, the warming agent 10 on the first continuous sheet members 102a and 102b does not come into contact with other members and devices for the menstrual napkin 1 after the coating step and before the mounting step. That is, the warming agent 10 on the first continuous sheet members 102a and 102b does not come into contact with other members and devices before the upper surface thereof is covered with the absorber 4 (web member). In other words, in the non-contact transfer step, the warming agent 10 on the first continuous sheet members 102a and 102b does not come into contact with anything. Therefore, the place where the warming agent 10 on the first continuous sheet member 102a, 102b does not need the warming agent 10 in the first continuous sheet member 102a, 102b and other materials for the menstrual napkin 1 (the place where the liquid is unnecessary). ) Can be suppressed.
That is, in the method for producing a menstrual napkin 1 (absorbent article), when the liquid warming agent 10 is applied, the warming agent 10 has an agent that is difficult to evaporate, regardless of whether or not the warming agent 10 has an agent that is difficult to evaporate. It is possible to prevent the warming agent 10 from adhering to the liquid-unnecessary portion of the material of the napkin 1. As a result, it is possible to suppress a situation in which the function of the product is deteriorated.
However, the "other member" is a material or a material used for manufacturing an absorbent article other than the web member that coats the coating liquid. The adhesive is not included in the material in this case because it does not move or diffuse after coating and does not affect the movement or diffusion of the coating liquid even if it comes into contact with the coating liquid.

In a preferred embodiment of the present embodiment, the liquid permeable sheet 2 (first sheet member) and the first continuous sheet member 102 are formed of an aggregate of fibers (example: cloth (nonwoven fabric, woven fabric, knitted fabric, etc.)). .. Therefore, when the warming agent 10 is contact-applied, at least a part of the warming agent 10 can be diffused inside the aggregate of fibers. As a result, the warming agent 10 tends to stay in the coating region CT of the first continuous sheet member 102, that is, at a desired location in the first continuous sheet member 102. As a result, it is possible to prevent the warming agent 10 from moving to and adhering to the liquid-unnecessary portion of the first continuous sheet member 102.

In a preferred embodiment of the present embodiment, the warming agent 10 is contact-coated on the non-net surface (one surface 102S1) of the first continuous sheet member 102 which is a non-woven fabric. That is, the warming agent 10 is applied to the surface of the first continuous sheet member 102 having a low fiber density. Therefore, the diffusion of the warming agent 10 in the plane direction (conveying direction MD and transverse direction CD) of the nonwoven fabric can be suppressed to a small extent. Therefore, the warming agent 10 can be easily retained in the coating region CT of the first continuous sheet member 102, that is, at a desired location in the first continuous sheet member 102. As a result, it is possible to prevent the warming agent 10 from moving to and adhering to the liquid-unnecessary portion of the first continuous sheet member 102.

In a preferred embodiment of the present embodiment, the warming agent 10 is intermittently contact-coated on one surface 102S1 of the first continuous sheet member 102 in the transport direction MD to form a coated region CT and a non-coated region NCT. There is. Therefore, the contact coating makes it easier for the warming agent 10 to stay in the coated region CT and makes it difficult to dispose of the warming agent 10 in the non-coated region NCT. Therefore, in this method, the first continuous sheet member 102b and the second continuous sheet member 103a are joined in a non-applied region NCT intermittently arranged in the transport direction MD, that is, a region in which the warming agent 10 does not exist. , The seal portion 109 can be formed. As a result, it is possible to prevent the warming agent 10 and the sealing portion 109 between the continuous sheet members from overlapping each other and weakening the bonding strength of the sealing portion 109.

In another embodiment, the warming agent (coating liquid) is arranged as in the warming agent 10a shown in FIG. In that case, the first continuous sheet member 102 is transported (cross flow) so that the width direction W of the liquid permeable sheet 2 is parallel to the transport direction MD of the first continuous sheet member 102. Then, the warming agent 10a is arranged at a plurality of strip-shaped positions extending in the transport direction MD and arranged in the transverse direction CD on one surface 102S1 of the first continuous sheet member 102 (stripe pattern). Therefore, the warming agent 10a can be arranged at a plurality of strip-shaped positions extending in the width direction W and lined up in the longitudinal direction L on the non-skin side surface of the liquid permeable sheet 2 of the menstrual napkin 1. As a result, when the menstrual napkin 1 is manufactured by cross-flowing, the position of the warming agent 10a can be prevented from shifting in the width direction W.

In another embodiment, the warming agent 10 is intermittently contact-applied to the transport direction MD and the transverse direction CD on one surface 102S1 of the first continuous sheet member 102 to form a coated region CT and a non-coated region NCT. do. For example, by providing the concave portions 211L and the convex portions 211H in a grid pattern on the outer peripheral surface 211S of the rotary roll 211, the warming agent 10 can be intermittently contact-applied to the transport direction MD and the transverse direction CD. Due to the intermittent direct coating, in this method, the first continuous sheet member 102b and the second continuous sheet member 103a are intermittently arranged in the transport direction MD and the transverse direction CD, that is, the non-coated region NCT, that is, a feeling of warmth. The sealing portion 109 can be formed by joining more reliably in the region where the agent 10 does not exist. As a result, it is possible to further prevent the warming agent 10 and the sealing portion 109 between the continuous sheet members from overlapping each other and weakening the bonding strength of the sealing portion 109.

In a preferred embodiment of the present embodiment, when the recess 211L passes in front of the delivery port 212a, that is, when the gap (distance d1) between the delivery port 212a and the first continuous sheet member 102 is large, the warming agent is sent from the delivery port 212a. 10 is delivered, and when the convex portion 211H passes in front of the delivery port 212a, that is, when the gap (distance d2) between the delivery port 212a and the first continuous sheet member 102 is small, the delivered warming agent 10 is used. 1 Apply to the continuous sheet member 102. Therefore, the warming agent 10 can be more reliably contact-applied to the region corresponding to the convex portion 211H in the first continuous sheet member 102, that is, the coating region CT. As a result, it is possible to further suppress the situation where the warming agent 10 moves to and adheres to the liquid-unnecessary portion in the first continuous sheet member 102.

In a preferred embodiment of the present embodiment, a suction port 211t for sucking the first continuous sheet member 102 is included on the downstream side of the convex portion 211H on the outer peripheral surface 211S of the rotary roll 211. Therefore, the first continuous sheet member 102 can be reliably aligned with the shape on the downstream side of the convex portion 211H, that is, the shape on the upstream side of the concave portion 211L. Thereby, the warming agent 10 can be more reliably applied to the region corresponding to the convex portion 211H in the first continuous sheet member 102, and the warming agent 10 can be more reliably not applied to the region corresponding to the concave portion 211L. be able to. Thereby, the situation where the warming agent 10 adheres to the liquid unnecessary portion in the first continuous sheet member 102 can be further suppressed.

In a preferred embodiment of the present embodiment, in order to stably transport the first continuous sheet member 102, the first continuous sheet member 102 is sucked from the other surface 102S2 of the first continuous sheet member 102 and is conveyed in the transport direction MD. At that time, the non-applied region NCT on one surface 102S1 of the first continuous sheet member 102 is sucked from the other surface 102S2 while the first continuous sheet member 102 is conveyed. That is, the region sucked during transportation does not overlap the coating region CT. Therefore, the warming agent 10 applied to one surface 102S1 of the first continuous sheet member 102 is sucked from the other surface 102S2 during transportation and is drawn in the plane direction (transportation direction MD and transverse direction CD) or in the vertical direction TD. It is possible to suppress the situation where it spreads to. As a result, it is possible to prevent the warming agent 10 from adhering to the liquid-unnecessary portion of the first continuous sheet member 102.

In another embodiment, in order to stably transport the first continuous sheet member 102, the first continuous sheet member 102 is sucked from the other surface 102S2 of the first continuous sheet member 102 and is conveyed in the transport direction MD. At that time, the first continuous sheet member 102 is conveyed while sucking the coating region CT on one surface 102S1 of the first continuous sheet member 102 from the other surface 102S2. That is, the region sucked during transportation overlaps the coating region CT. Therefore, the warming agent 10 applied to one surface 102S1 of the first continuous sheet member 102 is sucked during transportation, so that the warming agent 10 can be held in the coating region CT. As a result, it is possible to prevent the warming agent 10 of the first continuous sheet member 102 from diffusing in the plane direction (transportation direction MD and transverse direction CD) during transportation.

(Each material, etc. in menstrual napkin 1)
Next, each material and the like in the menstrual napkin 1 in each embodiment will be described.

The liquid permeable sheet 2 in each of the above embodiments has a warming agent 10. The warming agent 10 contains, for example, a warming component that activates TRP channels and a solvent component. The warming component is not particularly limited as long as it activates the TRP channel, and examples thereof include an agonist for the TRPV1 receptor and an agonist for the TRPV3 receptor, and an agonist for TRPV1 is preferable. This is because the TRPV1 receptor has a high activation temperature threshold of more than 43 ° C. and can give a high warmth to the wearer.

As the warming component, a plant-derived compound is preferable from the viewpoint of the wearer's sense of security. Examples of the warming component include vanillyl alcohol alkyl ether derivatives (eg, vanillyl ethyl ether, vanillyl butyl ether, vanillyl pentyl ether, vanillyl hexyl ether), ginger extract, ginger oil, gingerol, and zingerone, and the like. Any combination of can be mentioned. Of these, vanillyl alcohol alkyl ether derivatives are preferable, and vanillyl butyl ether is more preferable.

The solvent component is not particularly limited as long as it can contain a warming component, and examples thereof include lipophilic solvents and hydrophilic solvents. Such a solvent component can dissolve, disperse, etc. the warmth component. Examples of the lipophilic solvent include fats and oils. Examples of fats and oils include natural oils (eg, fatty acid esters such as neutral fatty acid triglycerides, coconut oil, flaxseed oil, etc.), hydrocarbons (eg, paraffin (eg, liquid paraffin)) and the like. Examples of the hydrophilic solvent include water and alcohol. Among them, the solvent component is preferably a lipophilic solvent from the viewpoint of easy control of volatility, particularly easy to reduce volatility, and difficult to inhibit absorbability. Among them, fatty acid esters are preferable, and neutral fatty acid triglycerides are more preferable. Neutral fatty acid triglycerides also function as modifiers.

The concentration of the warming component in the warming agent 10 is, for example, 1 to 50% by mass, preferably 5 to 30% by mass, and more preferably 10 to 15% by mass. Correspondingly, the concentration of the solvent component in the warming agent 10 is, for example, 50 to 99% by mass, preferably 70 to 95% by mass, and more preferably 85 to 90% by mass. The viscosity (25 ° C.) of the warming component is, for example, more than 0 and 500 mPa · s or less, preferably more than 0 and 300 mPa · s or less, more preferably more than 0 and 200 mPa · s or less. .. The viscosity (25 ° C.) of the solvent component is, for example, more than 0 to 300 mPa · s, preferably more than 0 and 200 mPa · s or less, and more preferably more than 0 and 100 mPa · s or less. The viscosity (25 ° C.) of the warming agent 10 in which the warming component and the solvent component are mixed is, for example, more than 0 and 300 mPa · s or less, preferably more than 0 and 200 mPa · s or less, more preferably. It exceeds 0 and is 100 mPa · s or less. The basis weight of the warming agent 10 is, for example, 0.001 to 40 g / m ² , preferably 0.01 to 30 g / m ² , and more preferably 0.1 to 20 g / m ² . be. This is from the viewpoint of giving a feeling of warmth to the wearer. For example, at 25 ° C., the viscosity of vanillyl butyl ether is 150 mPa · s, the viscosity of the neutral fatty acid triglyceride is 72 mPa · s, and the viscosity of the warming agent in which both are mixed is 77 mPa · s. Further, regarding the transport device of FIGS. 7 (a) and 7 (b), the viscosity of the warming agent 10 is difficult to diffuse and move from the time when the warming agent 10 is applied until the absorber 4 is placed. That is, the relatively high viscosity is, for example, 250 to 500 mPa · s, and the warming agent 10 diffuses and moves to a low viscosity, that is, the relatively high viscosity is, for example, more than 0 and 250 mPa · s. Can be mentioned.

The viscosity is measured by the following method.
The measurement method was based on JIS K7117-1 (1999) and JIS Z8803 (2011). As a measuring device, a B-type rotational viscometer (TVB-10M: manufactured by Toki Sangyo Co., Ltd.) was used. The torque at the time of measurement was 67.37 μN · m.

In the menstrual napkin 1, the warming agent 10 contains at least one other component having a desired action, in addition to the above-mentioned warming component and solvent component, as long as the effect of imparting a warming feeling to the wearer is not impaired. Can include. Such at least one other ingredient includes, for example, agents such as antibacterial agents, skin astringents and anti-inflammatory agents, vitamins, amino acids, zeolites, hyaluronic acid, collagen, petrolatum, trehalose, pH regulators, moisturizers. , Fragrances and the like.

When a cooling sensation agent is used instead of the warming agent 10, the cooling sensation agent contains, for example, a cooling sensation component that activates a TRP channel and a solvent component. The cooling sensation component is not particularly limited as long as it activates the TRP channel, and examples thereof include an agonist for the TRPM8 receptor and an agonist for the TRPA1 receptor, and an agonist for the TRPM8 receptor is preferable. This is to prevent the wearer from feeling excessively cold. Examples of the cooling sensation component include menthol (eg: l-menthol) and its derivatives (eg: menthol lactate, mentylglyceryl ether (eg: l-mentylglyceryl ether)), methyl salicylate, camphor, plants (eg: mint, mint, etc.). Eucalyptus) -derived essential oils and the like can be mentioned. The solvent component is the same as the solvent component for the warmth component. The concentration of the cooling sensation component in the cooling sensation agent is, for example, 5 to 90% by mass, preferably 10 to 80% by mass, and more preferably 30 to 70% by mass. Correspondingly, the concentration of the solvent component in the cooling sensation agent is, for example, 10 to 95% by mass, preferably 20 to 90% by mass, and more preferably 30 to 70% by mass. The viscosity and the basis weight are the same as in the case of the warming agent 10.

In the sanitary napkin 1, the liquid permeable sheet 2 (first continuous sheet member 102) may be a flat sheet member or a shaped sheet member. As the shaped sheet member, a plurality of protrusions extending in the longitudinal direction L (transportation direction MD) and arranged at predetermined intervals in the width direction W (transverse direction CD), and a plurality of protrusions located between adjacent protrusions. A sheet member having a recessed portion and a recessed portion thereof may be mentioned. This shaped member can suppress the diffusion and movement of the warming agent 10 in the width direction W (transverse direction CD).

The material of the liquid permeable sheet 2 (first continuous sheet member 102) is not particularly limited as long as it has liquid permeability, and is, for example, a cloth (example: non-woven fabric, woven fabric, knitted fabric), a perforated film, or the like. Can be mentioned. As the cloth, a non-woven fabric is preferable from the viewpoint of ease of manufacturing the sanitary napkin 1. Examples of the non-woven fabric include air-laid pulp, air-through non-woven fabric, spunbond non-woven fabric, point-bond non-woven fabric, spunlace non-woven fabric, needle punch non-woven fabric, melt-blown non-woven fabric, and a combination thereof (example: SMS). The basis weight of the liquid permeable sheet 2 (first continuous sheet member 102) is, for example, 2 to 200 g / m ² , preferably 5 to 100 g / m ² , and more preferably 10 to 50 g / m ² . Is. The thickness of the liquid permeable sheet 2 is, for example, 0.1 to 6 mm, preferably 0.2 to 4 mm, and more preferably 0.4 to 2 mm. The fiber density of the liquid permeable sheet 2 is, for example, 0.001 g / cm ³ to 0.6 g / cm ³ , preferably 0.002 g / cm ³ to 0.4 g / cm ³ , and more preferably 0. It is .004 g / cm ³ to 0.3 g / cm ³ .

Examples of the fibers constituting the fabric include natural fibers, synthetic fibers, and semi-synthetic fibers. Examples of natural fibers include pulp fibers and regenerated cellulose fibers. Examples of the regenerated cellulose fiber include rayon fiber. Examples of the semi-synthetic fiber include semi-synthetic cellulose fiber such as acetate fiber. Examples of synthetic fibers include thermoplastic fibers. Thermoplastic fibers include, for example, polyolefin polymers such as polyethylene and polypropylene, polyester polymers such as polyethylene terephthalate (PET), polybutylene terephthalate and polypentylene terephthalate, and polyamides such as nylon 6 and nylon 6,6. Examples thereof include fibers formed from based polymers, acrylic polymers, polyacrylonitrile-based polymers, modified products thereof, or combinations thereof. Examples of the perforated film include a polyethylene or polypropylene sheet provided with a plurality of perforated portions.

In the menstrual napkin 1, the material of the liquid impermeable sheet 3 is not particularly limited as long as it has liquid impermeable properties. However, it is not a material for the liquid impermeable sheet 3 from the viewpoint of making it difficult for the air warmed by the effect of the warming agent 10 to dissipate from the region between the liquid impermeable sheet 3 and the skin. It is preferable to use one having breathability. Examples of the material of the liquid-impermeable sheet 3 include a synthetic resin film such as polyethylene and polypropylene, a non-woven fabric such as spunbond or spunlace bonded with a synthetic resin film, and a multi-layered non-woven fabric such as SMS. A synthetic resin film having breathability is preferable. The basis weight of the liquid impermeable sheet 3 is, for example, 5 to 100 g / m ² , preferably 10 to 50 g / m ² , and more preferably 15 to 30 g / m ² .

In the sanitary napkin 1, examples of the material of the absorber 4 (absorption core) include pulp fibers and superabsorbent polymers. When the absorber 4 has a core wrap, the material of the core wrap may be, for example, tissue.

In the sanitary napkin 1, the material of the adhesive portion is a hot melt adhesive, for example, styrene-ethylene-butadiene-styrene (SEBS), styrene-butadiene-styrene (SBS), styrene-isoprene-styrene (SIS). Pressure-sensitive adhesives or heat-sensitive adhesives mainly composed of rubbers such as or olefins such as linear low-density polyethylene; water-soluble polymers (for example, polyvinyl alcohol, carboxylmethylcellulose, gelatin, etc.) Alternatively, a water-sensitive adhesive made of a water-swellable polymer (for example, polyvinyl acetate, sodium polyacrylate, etc.) can be mentioned.

In the sanitary napkin 1, the warming agent 10 is arranged on the non-skin side surface of the liquid permeable sheet 2, but the skin side surface of the liquid permeable sheet 2 and the skin side or non-skin side of the absorber 4. It may be arranged on the side surface or the skin side surface of the liquid impermeable sheet 3.

The absorbent article of the present invention (exemplification: sanitary napkin) is not limited to the above-described embodiments, and can be combined with each other or publicly known within a range not deviating from the object and purpose of the present invention. It is possible to apply the technology.

1 Menstrual napkin (absorbent article)
2 Liquid permeable sheet (1st sheet member)
4 Absorber (web member)
10 Warming agent (coating liquid)
102 First continuous sheet member

Claims (7)

A method for producing an absorbent article comprising a first sheet member, a coating liquid applied to one surface of the first sheet member, and a web member adjacent to the coating liquid on the first sheet member. And,
A coating step of contact-coating the coating liquid, which is a liquid at room temperature, onto one surface of the first continuous sheet member for the first sheet member extending along the transport direction.
The mounting step of mounting the web member on the surface of the first continuous sheet member having the coating liquid, and
Equipped with
After the coating step, the non-contact transport step of transporting the coating liquid on the one surface of the first continuous sheet member to the above-mentioned placement step without contacting with other members and devices for the absorbent article. Equipped with
The first sheet member and the first continuous sheet member are formed of an aggregate of fibers.
The aggregate of the fibers is a non-woven fabric and is
The nonwoven fabric has a net surface that was in contact with the net-like support at the time of entanglement and a non-net surface opposite to the net surface.
The coating step includes a step of contact-coating the coating liquid on the non-net surface of the first continuous sheet member.
Method. The first sheet member, the coating liquid applied to one surface of the first sheet member, the web member adjacent to the coating liquid on the first sheet member, and the web member sandwiching the first sheet member. A method of manufacturing an absorbent article comprising a sheet member and a second sheet member stacked on top of each other.
A coating step of contact-coating the coating liquid, which is a liquid at room temperature, onto one surface of the first continuous sheet member for the first sheet member extending along the transport direction.
The mounting step of mounting the web member on the surface of the first continuous sheet member having the coating liquid, and
Equipped with
After the coating step, the non-contact transport step of transporting the coating liquid on the one surface of the first continuous sheet member to the above-mentioned placement step without contacting with other members and devices for the absorbent article. Equipped with
In the coating step, the coating liquid is intermittently contact-coated on one surface of the first continuous sheet member in the transport direction, and the coating region to which the coating liquid is applied and the coating liquid are applied. Including the step of forming the uncoated area and the uncoated area.
The above-mentioned placement step includes a step of placing the web member on the coating area.
The method is
The second continuous seat member for the second seat member extending along the transport direction is arranged so as to overlap the first continuous seat member with the web member interposed therebetween, and the first continuous seat member and the said. Further comprising a joining step of joining the second continuous sheet member at a position corresponding to the non-coated region.
Method . In the coating step, the coating liquid is intermittently contact-applied to the one surface of the first continuous sheet member in the transport direction and the transverse direction orthogonal to the transport direction to obtain the coating region and the coating region. Including a step of forming a non-coated area,
The method according to claim 2 . The coating step is
A step of preparing a coating device for contact-applying the coating liquid to the first continuous sheet member.
The coating device
A rotary roll for transporting the first continuous sheet member along the outer peripheral surface, and
A nozzle that delivers the coating liquid toward the outer peripheral surface, and the like.
The rotary roll has concave portions and convex portions alternately arranged in the circumferential direction on the outer peripheral surface.
The nozzle has an outlet for the coating liquid arranged in close proximity to the outer peripheral surface.
In the process, the delivery port has a narrower gap between the convex portion and the concave portion than the gap between the convex portion and the concave portion.
When the concave portion passes in front of the delivery port by rotating the rotary roll together with the first continuous sheet member, the coating liquid is delivered from the delivery port, and the convex portion passes in front of the delivery port. In the step of contact-applying the delivered coating liquid to the first continuous sheet member,
including,
The method according to claim 2 or 3 . The rotary roll includes a suction port for sucking the first continuous sheet member to the outer peripheral surface on the downstream side of the convex portion on the outer peripheral surface.
The method according to claim 4 . The non-contact transfer step is
The non-applied region of the first continuous sheet member is sucked from the other surface of the first continuous sheet member and conveyed to the above-mentioned placement step.
The method according to any one of claims 2 to 5 . The non-contact transfer step is
Including a step of transporting the coating region of the first continuous sheet member to the above-mentioned placement step while sucking from the other surface of the first continuous sheet member.
The method according to any one of claims 2 to 5 .

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