JP2004033348A - Multi-layer absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-layer absorbent article to be peeled off from the topmost layer one by one securely and easily. <P>SOLUTION: This multi-layer absorbent article 1 consists of a plurality of absorbent materials 2, 3 and 4 layered one on another. The absorbent materials 2, 3 and 4 have a liquid permeable surface layer, a liquid impermeable leakage preventive layer, and an absorbent layer with liquid holding property disposed between the surface layer and the leakage preventive layer. In the multi-layer absorbent article 1, the absorbent materials are bonded together to be integrated, and a notch 21 is formed at least in one of the plurality of layered absorbed materials. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a multilayer absorbent article in which a plurality of absorbers are superposed and integrated.
[0002]
[Prior art]
A multi-layer absorbent article in which a plurality of absorbers are laminated and integrated has been put to practical use with emphasis on the convenience of women using sanitary products. For example, Japanese Patent Application No. 60-30562 discloses a three-layered sanitary napkin in which the used portion can be peeled off. According to such a multilayer absorbent article, it is not necessary to carry a replacement sanitary article, and the operation of attaching and attaching the underwear to a predetermined position may be performed only once, and further, by removing the absorbent body, Since fresh absorbents appear on the surface one after another, they can be used for a long time, and there is an advantage that the replacement time can be reduced.
[0003]
[Problems to be solved by the invention]
However, in order to successively use the absorber having such a laminated structure, it is necessary to peel off the absorber in the uppermost layer one by one, and sometimes two or more absorbers in the upper layer are peeled off at the same time. As a result, there is a problem that the unused portion must be discarded.
[0004]
Therefore, an object of the present invention is to provide a multilayer absorbent article that can be easily and sequentially peeled off from the uppermost one absorbent body in order.
[0005]
[Means for Solving the Problems]
Hereinafter, the present invention will be described. In addition, in order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are added in parentheses, but the present invention is not limited to the illustrated embodiment.
[0006]
In the first embodiment of the present invention, a liquid-permeable surface layer (22, 32, 42), a liquid-impermeable leakproof layer (23, 33, 43), and an intervening layer are provided between the surface layer and the leakproof layer. A multilayer absorbent article (1) in which a plurality of absorbent bodies (2, 3, 4) each having an absorbent layer (24, 34, 44) having a liquid retaining property are stacked. The object is achieved by providing a multilayer absorbent article in which the bodies are integrated by joining, and a cutout (21) is provided in at least one of the plurality of stacked absorbers. I do.
[0007]
According to the multilayer absorbent article of the first aspect, since a plurality of absorbers each including a surface layer, a leak-proof layer, and an absorbent layer interposed between the surface layer and the leak-proof layer are stacked, a replacement It is not necessary to carry the sanitary napkin, and it is only necessary to attach and attach the underwear to the predetermined position once, and since the absorbent is peeled off, fresh absorbents appear on the surface one after another. Use over time is possible, and replacement time can be reduced. In addition, since the notch is provided in the absorber, the user can reliably peel off the absorber in order from one of the uppermost layers by relying on the notch.
[0008]
Note that the surface layer, the absorption layer, and the leakage prevention layer do not necessarily need to be made of three materials. For example, the surface layer and the absorption layer may be formed from a single absorption sheet.
[0009]
In the above aspect, the shape and / or size of the notch may be changed in the order in which the absorbers are stacked.
[0010]
In the case of such a configuration, since the shape and / or size of the cutout portion changes in the order in which the cutout portions are stacked, the absorber can be easily peeled off from the top in order.
[0011]
In the case of the above configuration, further, when the side in contact with the user's skin of the plurality of stacked absorbers is the upper layer side, the peel strength between the plurality of stacked absorbers is higher as going from the upper layer to the lower layer. May be set.
[0012]
In the case of such a configuration, the absorber can be easily and sequentially peeled from the upper layer side having a small peel strength.
[0013]
In addition, in the case of the above-described configuration, the slip-adhesive pressure-sensitive adhesive layer (5) is further provided on one of the outermost layers on the plurality of stacked absorbers, and the maximum peel strength between the absorbers is X, When the peel strength between the slip-resistant adhesive layer and the Kanakin No. 3 cotton cloth is Y, and the minimum peel strength between the layers in the absorber is Z.
X <Y <Z
The following relationship may be established. Here, “Kanakin No. 3 cotton cloth” is a standard piece of cloth that can be obtained from the Japan Standards Association and is used for various tests. Here, shorts worn by a user of the multilayer absorbent article are assumed.
[0014]
In the case of such a configuration, first, peeling is performed sequentially between the absorbers where the lowest peel strength X is set, and thereafter, a peel strength Y higher than X is realized by the slip-resistant adhesive layer. Peeling is performed between the shorts and the lowermost absorber. Further, since the peel strength Z between each layer of the absorber is set higher than these peel strengths X and Y, the structure inside each absorber is prevented from being broken by peeling even during the peeling. You.
[0015]
According to a second aspect of the present invention, there is provided an absorber including a liquid-permeable surface layer, a liquid-impermeable leakproof layer, and an absorbent layer interposed between the surface layer and the leakproof layer and having a liquid retaining property. A step of forming a cutout portion by cutting a part of at least one of the plurality of absorbers, and a step of integrally joining the plurality of absorbers. The object is achieved by a method for producing a multilayer absorbent article.
[0016]
According to this aspect, it is possible to provide a method for efficiently producing the multilayer absorbent article of the first aspect.
[0017]
Such actions and advantages of the present invention will be apparent from embodiments described below.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
FIGS. 1A and 1B show a panty liner which is an embodiment of the multilayer absorbent article according to the present invention, wherein FIG. 1A is a plan view, FIG. (c) shows a cross-sectional view taken along line CC in (a). This multilayer absorbent article 1 is constituted by three layers of an upper absorber 2, an intermediate absorber 3, and a lower absorber 4. Each of the absorbers 2, 3, and 4 has a circular longitudinally long edge (horizontally long in the figure) and is basically formed in the same shape. Notches 21 and 31 are formed in the upper absorber 2 and the intermediate absorber 3, respectively. The number and position of the notches 21 and 31 in each absorber may be basically set arbitrarily, but in the present embodiment, the longitudinal direction of each absorber layer 2 and 3 is considered from the viewpoint that the user can easily peel off. A pair is provided at each end. The size of the notch is such that the notch 21 of the upper absorber 2 is larger than the notch 31 of the intermediate absorber 3 so that the user can easily peel off the upper absorber 2 in order. The layer absorbers 2, 3, and 4 are integrally joined and fixed by a predetermined joining method. In the cutout portions 21 and 31, the joining between the respective layer absorbers is omitted.
[0019]
On the lower surface of the lower absorbent body 4, a slip-resistant adhesive layer 5 for fixing the multilayer absorbent article 1 of the present embodiment to clothing such as shorts is provided. A release paper 6 also serving as a wrapping is disposed further below the slip-resistant adhesive layer 5.
[0020]
In FIG. 1, a portion indicated by reference numeral 10 represents a surface layer / absorbing layer / leak-proof layer or a sealing portion between the layers of the surface layer / leak-proof layer in each layer absorber. Will be described later in the section related to FIG.
[0021]
When the user uses the multilayer absorbent article 1, the release paper 6 is peeled off, the slip-resistant adhesive layer 5 on the lower surface of the lower absorbent body 4 is attached to an undergarment such as shorts, and every predetermined time (for example, The upper absorber 2 and the intermediate absorber 3 may be peeled off in order of every 2 hours) or depending on the situation of dirt. Thus, once the multilayer absorbent article 1 is attached to shorts or the like, in the above example, if the multilayer absorbent article 1 is peeled off every two hours, the replacement is not required for six hours. Therefore, there is an advantage that it is not necessary to carry many sanitary products. In addition, the notch of each layer absorber is formed in a different size in the stacking order, and furthermore, since the absorbers in this portion are not joined, the user can rely on this to remove only one of the uppermost layers. It can be easily peeled off. Thus, it is possible to avoid a situation in which the two sheets of the upper layer are peeled off at the same time, and the unused absorbent must be discarded.
[0022]
FIG. 2 shows the upper absorbent body 2 alone, (a) is a plan view, and (b) is a cross-sectional view taken along the line IIB-IIB in (a). The basic structure of each of the layer absorbers 2, 3, and 4 is the same except for the shape or presence or absence of the cutouts 21 and 31, and therefore, each layer absorber will be described below as a representative of the upper layer absorber 2. .
[0023]
The upper absorbent body 2 has a surface layer 22 on the side (upper side in FIG. 2B) in contact with the skin of the user, a leakage prevention layer 23, and an absorption layer sandwiched and held between the surface layer 22 and the leakage prevention layer 23. 24. In the upper absorber 2, sealing (joining) of the entire periphery including the notches 21, 21 is performed. That is, sealing is performed between the surface layer 22 / absorption layer 24 / leakage prevention layer 23, or between the layers of the surface layer 22 / leakage prevention layer 23. This seal portion is represented by reference numeral 10 in FIG. 2 (and FIG. 1). ing. In addition, if necessary, a concealing layer may be provided between the surface layer 22 and the absorbing layer 24 from the viewpoint of preventing the absorbent from being seen clearly.
[0024]
As the material of the surface layer 22, a nonwoven fabric made of synthetic fibers or natural fibers, an apertured film, or the like can be used. From the viewpoint that the absorption layer 24 does not take up too much thickness and also has an appropriate absorptivity, a fiber aggregate or foam made of natural fibers or synthetic fibers can be used. Further, for the leak-proof layer 23, various films, a water-repellent nonwoven fabric, or the like can be used. In addition, it is desirable that the leak-proof layer 23 is made of a material having moisture permeability from the viewpoint of preventing stuffiness.
[0025]
The planar shape of the surface layer 22 is formed larger than the length in the width direction of the absorbing layer 24, and covers the entire upper surface of the absorbing layer 24. The leakage prevention layer 23 has the same shape as the surface layer 22 and covers the lower surface of the absorption layer 24. The surface layer 22, the leakage prevention layer 23, and the absorption layer 24 are joined to each other according to a normal method. In the left and right cutouts 21, 21, cutouts of the cutouts improve the strength so that peeling between the surface layer 22, the leakage prevention layer 23, and the absorption layer 24 does not occur. As shown at both ends, bonding is performed before overlapping a plurality of absorbers by using known means such as an adhesive, thermal bonding, and ultrasonic bonding alone or in combination.
[0026]
Next, the bonding between the respective layer absorbers 2, 3, and 4 will be described with reference to FIG. 3 showing the layer structure of the multilayer absorbent article 1. The bonding between these respective layer absorbers is performed between the leakproof layer 23 of the upper absorber 2 and the surface layer 32 of the intermediate absorber 3 and between the leakproof layer 33 of the intermediate absorber 3 and the lower absorber 4. It is performed between the surface layer 42. These joints may be formed on the entire surface except for the cutout portions 21 and 31 from the viewpoint of convenience when peeling off from the upper absorber 2. Alternatively, it may be applied only to the peripheral portion excluding the notch so that the peeling can be further facilitated. From the viewpoint that the peel strength by joining can be reliably peeled off from the upper absorber 2, the peel strength between the leak-proof layer 23 of the upper absorber 2 and the surface layer 32 of the intermediate absorber 3 is reduced. x, when the peel strength between the leak-proof layer 33 of the intermediate absorber 3 and the surface layer 42 of the lower absorber 4 is X, it is preferable that x <X. Further, when the peel strength of the slip-resistant adhesive layer 5 provided on the lower surface of the lower absorbent body 4 to shorts or the like is Y.
X <Y
It is preferable to set so that In this way, the peel strength increases as one goes to the lower layer. Ie
x <X <Y
It becomes.
Further, these peel strengths x, X, and Y are obtained by bonding the surface layers 22, 32, 42, the absorption layers 24, 34, 44, and the leak-proof layers 23, 33, 43 in the respective layer absorbers 2, 3, and 4. It may be set to be smaller than the peel strength Z of the joined portion. That is, during each peel strength,
x <X <Y <Z
It is preferable in the present embodiment that the following relationship is established. With this setting, each of the laminated absorbers can be sequentially peeled from the upper absorber 2 to the lower absorber 4, and by this peeling operation, the multilayer absorbent article 1 itself becomes shorts or the like. From being peeled off from each other and peeling off between the surface layer, the absorbing layer, and the leak-proof layer constituting each absorber are prevented.
[0027]
Next, a method for measuring the peel strength will be described with reference to FIG. First, the joint portion of the multilayer absorbent article 1 is peeled off in advance by about 30 mm. Next, the slip-resistant adhesive layer 5 on the lower surface of the lower absorbent body 4 of the multilayer absorbent article 1 and the Kanakin No. 3 cotton cloth (obtained from the Japanese Standards Association) are attached, and a 2 kg rubber roller is attached to the surface of the multilayer absorbent article 1. The two are reciprocated while being pressed to the side, and both are bonded and fixed. At this time, the kanakin No. 3 cotton cloth is larger than the slip-resistant adhesive layer 5 of the absorbent article 1 and extends 10 mm from the peeling-side end of the multilayer absorbent article 1. In this state, the extension of the kanakin No. 3 cotton cloth on the lower absorbent body 4 side is sandwiched together with the end of the multilayer absorbent article 1 with a KOKUYO double clip extra large 41 mm (Clear J32). Then, the handle portion of the clip is hooked on a hook attached to a push-pull gauge 9505 (B type) manufactured by Aiko Engineering. At this time, the hook is adjusted so that the pulling direction is as vertical as possible. Next, the upper absorbent body 2 or the upper absorbent body 2 and the intermediate absorbent body 3 are peeled by hand in a direction opposite to the hook pulling direction by 180 °. The maximum strength when about 50 mm is peeled off is measured. The peeling speed at this time is about 200 to 500 mm / min. The measurement is performed five times for one joint part, and the average value is defined as the joint strength. It should be noted that the bonding portion is peeled off by about 30 mm prior to the measurement, because in a general absorbent article, the longitudinal end is formed to be round, so that in order to obtain an accurate measurement value, the width is preferably constant in the longitudinal direction as much as possible. This is because an attempt is made to perform measurement at the joint of the broken part. In this way, it is possible to measure the peel strength between each layer absorber.
[0028]
As described above, in the multilayer absorbent article 1 of the present embodiment, the basic structure of the upper absorber 2, the intermediate absorber 3, and the lower absorber 4 is the same, and is conventionally used in a napkin or a panty liner. Materials can be used without limitation. In addition, in the following points, it is possible to provide an absorbent article having preferable properties by using different materials for each layer. First, in the upper absorbent body 2, from the viewpoint of making the multilayer absorbent article 1 flexible and free from discomfort even in the superimposed state (initial state of use), each of the materials used has a low basis weight. Preferably, it is flexible. Specifically, the basis weight of the surface layer 22 is 15 to 25 g / m. ² Air-through nonwoven fabric made of synthetic fiber subjected to hydrophilic treatment, and a basis weight of 30 to 40 g / m ² Is preferred. The absorption layer 24 has a basis weight of 20 to 50 g / m. ² Made of a paper or pulp fiber aggregate water-absorbent material, or having a basis weight of 15 to 30 g / m ² Preferred is an air-through nonwoven fabric mainly composed of a synthetic fiber subjected to hydrophilic treatment. If necessary, a superabsorbent polymer may be used in the absorbent layer.
[0029]
The basis weight of the leak-proof layer 23 is 10 to 25 g / m. ² It is preferable to use a breathable film or a water-repellent nonwoven fabric, and from the viewpoint of further improving flexibility, it is preferable to use a spunbonded nonwoven fabric, a meltblown nonwoven fabric, or an SMS nonwoven fabric which is a composite of both. Further, by combining these materials, the basis weight of the entire absorber is 50 to 100 g / m2. ² It is preferable that
[0030]
On the other hand, it is preferable to use a material having a large basis weight or a material having elasticity in the lower absorbent body 4 from the viewpoint of having cushioning properties and preventing distortion during use. Specifically, the basis weight of the surface layer 42 is 15 to 25 g / m. ² Air-through nonwoven fabric made of synthetic fiber subjected to hydrophilic treatment, and a basis weight of 30 to 40 g / m ² Is preferred. The absorption layer 44 has a basis weight of 30 to 60 g / m. ² Preferred is an air-through nonwoven fabric mainly composed of a synthetic fiber subjected to hydrophilic treatment. As the leak-proof layer 43, adhesion with clothing by the slip-resistant adhesive layer 5 is performed, so that its strength is better and the basis weight is 25 to 45 g / m. ² Air-permeable film and basis weight of 12 to 30 g / m ² It is preferable to use a water-repellent nonwoven fabric (a spunbonded nonwoven fabric, a meltblown nonwoven fabric, or an SMS nonwoven fabric which is a composite of both). By combining these materials, the total weight of the absorber is 70 to 150 g / m. ² It is preferable that Further, in order to suppress the generation of odor due to body fluids, various deodorants (activated carbon, zeolite, silica, cyclodextrin, etc.) may be blended in a predetermined portion of each absorber. In this case, it is preferable that a deodorant is blended in the lower absorbent body 4 because the flexibility is not impaired and the cost is advantageous. In addition, since it is rich in flexibility, does not cause the deodorant to fall off, and is advantageous in terms of cost, instead of adding the deodorant to the lower absorbent body 4 or in addition thereto, the deodorant is used. It is further preferred to use a deodorant sheet containing the same.
[0031]
FIG. 5 is a diagram schematically illustrating a process of manufacturing the multilayer absorbent article 1 according to the present embodiment. This manufacturing process includes a first process part P1 for forming the upper absorber 2, a second process part P2 for forming the middle absorber 3, a third process part P3 for forming the lower absorber 4, a first to a first process. A fourth process part P4 for multilayer bonding of the three-layer absorber formed in the three process parts, and a fifth process part P5 for forming the slip-resistant adhesive layer 5 and disposing the release paper 6 are provided.
[0032]
In the first process section P1, a surface layer unwinding roll 122 for unwinding the raw material of the surface layer 22, a leakproof layer unwinding roll 123 for unwinding the raw material of the leakproof layer 23, and a raw material for the absorbing layer 24 , And hot melt guns 125 and 126 are provided near the unwinding positions of the surface layer unwinding roll 122 and the leakage prevention layer unwinding roll 123, respectively. Further, a seal roll set 51A and a cut roll set 52A are provided downstream of the process.
[0033]
In the second process section P2, the surface layer unwinding roll 132 for unwinding the raw material of the surface layer 32, the leakage prevention layer unwinding roll 133 for unwinding the raw material of the leakage prevention layer 33, and the absorbing layer 34 An absorption layer unwinding roll 134 for unwinding the raw material is provided, and hot melt guns 135 and 136 are provided near the unwinding positions of the surface layer unwinding roll 132 and the leakage prevention layer unwinding roll 133, respectively. I have. Further, in the second process section P2, a hot melt gun 137 for bonding the intermediate layer absorber is provided. Further, a seal roll set 51B and a cut roll set 52B are provided downstream of the process.
[0034]
Further, in the third process section P3, the surface layer unwinding roll 142 for unwinding the raw material of the surface layer 42, the leakage prevention layer unwinding roll 143 for unwinding the raw material of the leakage prevention layer 43, and the absorption layer 44 An absorption layer unwinding roll 144 for unwinding the raw material is provided, and hot melt guns 145 and 146 are provided near the unwinding positions of the surface layer unwinding roll 142 and the leakage prevention layer unwinding roll 143, respectively. I have. Further, in the third process section P3, a hot melt gun 147 for bonding the lower absorbent body is provided. Further, a seal roll set 51C is provided downstream of the process.
[0035]
The fourth process section P4 includes a multilayer joining roll set 53 and a multilayer joining cut roll set 54. Further, the fifth process section P5 is provided with a release paper unwinding roll 106 for unwinding the release paper 6, and a hot melt coating gun 105 for forming the slip-resistant adhesive layer 5 for forming the slip-resistant adhesive layer 5.
[0036]
In the first process section P1, the original rolls of the surface layer 22, the absorption layer 24, and the leakage prevention layer 23, which should constitute the upper absorbent body 2 according to a conventional method, are provided on the seal roll set 51A by the respective unwinding rolls 123 to 125. The raw material of each layer is sealed in advance along a portion to be cut by the cut roll set 52A and the cut roll set 54.
[0037]
Similarly, in the second process part P2, the original rolls of the surface layer 32, the absorption layer 34, and the leakage prevention layer 33 which should constitute the intermediate layer absorber 3 are provided on the unwinding rolls 123 to in the seal roll set 51B. The layers are unwound from and inserted through 125, and the material of each layer is sealed in advance along a portion cut by the cut roll set 52B and the cut roll set 54.
[0038]
Further, in the third process section P3, in the seal roll set 51C, the respective raw materials of the surface layer 42, the absorption layer 44, and the leakage prevention layer 43, which should constitute the lower absorbent body 4, are supplied from the unwinding rolls 123 to 125. The layers are unwound and inserted, and the material of each layer is sealed along a portion to be cut by the cut roll set 54.
[0039]
The raw material of the upper absorbent body 2 and the intermediate absorbent body 3 sealed by the seal roll set 51A and the seal roll set 51B are then inserted into the cut roll sets 52A and 52B. The upper and lower rolls of the cut roll sets 52A and 52B are formed with steps having a predetermined shape corresponding to the cutouts 21 and 31, respectively, so that the original rolls of the upper absorbent body 2 and the intermediate absorbent body 3 can be inserted. A predetermined shape is cut so that the notches 21 and 31 are formed between them. The web of the upper absorber 2 that has passed through the cut roll set 52A, the web of the intermediate absorber 3 that has passed through the cut roll set 52B, and the web of the lower absorber 4 that has passed through the seal roll set 51C are stacked. To the fourth process section P4.
[0040]
In the fourth process part P4, the respective layer absorber raw materials are laminated and inserted into the multilayer joining roll set 53. In the multilayer joining roll set 53, the outer peripheral portion of each layer absorber and the entire surface (excluding the left and right cutouts 21 and 31) are formed on the surface of the leak-proof layer 23 of the upper absorber 2 and the surface of the intermediate absorber 3. This is performed between the layer 32 and between the leak-proof layer 33 of the intermediate absorber 3 and the surface layer 42 of the lower absorber 4. Thereafter, the multilayer absorbent article 1 is cut out by the multilayer cut roll set 54.
[0041]
In the fifth process section P5, the slip-resistant adhesive layer 5 is applied to the lower surface of the lower absorber 4 by the hot-melt coating gun 105 for the slip-resistant adhesive layer. Next, the release paper is unwound from the release paper unwinding roll 106 and is mounted on the lower layer of the slip-resistant adhesive layer 5 to complete the multilayer absorbent article 1.
[0042]
In the above process, the method of bonding can be appropriately selected and combined from a method using an adhesive such as hot melt, a method using heat sealing, a method using ultrasonic waves, and the like. It is preferable to use in combination with heat sealing under pressure in that stable bonding strength can be obtained. In addition, the same method as the bonding of each layer can be used in the method of multilayer bonding, but between the upper absorber 2 and the intermediate absorber 3 and between the intermediate absorber 3 and the lower absorber 4. As described above, it is preferable to provide a difference in the peel strength between the two. In order to realize this, specifically, in the lower absorbent body 4 where the peel strength is desired to be higher than that of the intermediate absorbent body 3 at the time of hot melt adhesion between the surface layer and the absorbent layer (or the leak-proof layer) before the bonding of each layer,
(1) Change the coating method (curtain coating, spiral coating, etc.).
(2) Increase the coating basis weight.
{Circle around (3)} Over-coating at the joint site (Hot melt for joining the middle layer absorber, hot melt for joining the lower layer absorber).
It is preferable to select and combine any of the above. Means (1) and (2) are that the amount of hot melt seeping out at the joint between the upper absorber 2 and the intermediate absorber 3 and between the intermediate absorber 3 and the lower absorber 4 is reduced. Using the change, the joint strength is controlled.
[0043]
Specifically, in FIG. 5, by changing the hot melt guns 135 and 145 arranged in the second process section P2 and the third process section, the bonding strength can be controlled even with the same coating amount. Means that can be performed are (1). For example, in the second process section P2, a curtain coating gun which is a uniform coating method is used as the hot melt gun 135, and in the third process section P3, the hot melt is concentrated on the linear portion as the hot melt gun 145. It is conceivable to arrange a spiral coating gun which is a coating method. (2) changes the coating amount in these hot melt guns 135 and 145.
[0044]
On the other hand, the means of (3) is to dispose a hot melt gun 137 for joining the intermediate layer absorber in the second process part P2 and a hot melt gun 147 for joining the lower absorbent body in the third process part P3, and only in the vicinity of the joining part. The bonding strength can be controlled by increasing the amount of hot melt.
[0045]
Although there is no particular limitation on the hot melt used, as described above, a small amount of the adhesive oozes out to the surface side of the surface layers 32 and 42 of the intermediate absorbent body 3 and the lower absorbent body 4 at the joint site. Because of the possibility, it is preferable to use a type of hot melt that does not stick to the skin.
[0046]
In addition, in order to prevent the adhesive from being present on the skin-contacting surface, a process such as weak peeling treatment on the skin-contacting surface side of each surface layer, or processing in which the adhesive is easily peeled off, such as antifouling processing, is difficult to remain. The adhesive moves to the leak-proof layer side at the time of peeling, and does not leave the adhesive on the surface layer side by applying a process that has high affinity with the adhesive (such as lipophilic treatment) to the leak-proof material. As described above, it is also possible to mix an adhesive directly between the absorbers to perform bonding.
[0047]
As described above, after joining by the seal roll set, the cut roll forming portions are cut by the cut roll sets 52A and 52B, and multilayer joining by the multilayer joining roll set 53 is performed. Thereafter, the entire circumference of the multilayer absorbent article 1 is cut by the multilayer cut roll set 54 into a shape along the joining shape by the seal roll set. In the relationship between the joining portion and the cutting portion, the joining portion is preferably formed in the peripheral shape of the multilayer absorbent article, and the cutting portion is 2 mm to 5 mm from the central portion of the joining portion having a certain width, or the peripheral shape thereof. It is preferable to be located at a position away from the outside in terms of beauty of appearance and feel.
[0048]
Although the present invention has been described in connection with the most practical and preferred embodiments at this time, the present invention is not limited to the embodiments disclosed herein. Instead, the present invention can be appropriately changed within a scope not contrary to the gist or idea of the invention which can be read from the claims and the entire specification, and a multilayer absorbent article with such a change is also included in the technical scope of the present invention. Must be understood as something. For example, it should be understood that the following modified examples belong to the technical scope of the present invention.
(Modification)
1. In the above embodiment, the number of layers of the absorber is three, but may be two or four or more. When four or more layers are used, the bonding strength between the absorbers may be set to be lower toward the upper layer side from the viewpoint that the peeling can be performed in order from the uppermost layer.
2. Although the notch portions are provided at two locations on the left and right in the longitudinal direction of the absorber, they may be provided at only one of the left and right locations. Also, it can be provided at any place on the circumference.
3. Although the joining position between the surface layer, the absorbing layer, the leak-proof layer, and each layer is defined as the peripheral portion, the joining may be performed over the entire surface. In this case, the joint may be provided in any of solid, spot, spiral, and linear forms over the entire surface.
4. The notch is not provided in the direction going inward, but a difference is provided in the length in the longitudinal direction of each layer (this difference becomes the notch of the present invention). You may comprise so that an absorber can be peeled off.
5. As a method of cutting the notch portion, a method using a cut roll set was shown, but for example, cutting by a method such as shear cut, pinch cut, heat seal cut, ultrasonic seal cut, pressure welding cut, water jet, laser cut, etc. Is also possible.
6. A projection may be provided in addition to the notch as a clue for the user to peel off the absorber. In this case, the notch and the protrusion can be freely combined. For example, the upper layer absorber 2 has a notch and a protrusion, the middle layer absorber 3 has a notch and a notch, or the upper layer absorber 2 has a notch and a protrusion, and the middle layer absorber 3 has a protrusion. It can be configured by combining the part and the notch part.
7. Although the joining between the absorbers is performed at the peripheral portion, the joining may be performed over the entire surface in a spot shape.
8. The bonding position between the layers and the bonding position between the absorbers may overlap or be shifted.
9. In the present invention, it is not always essential to change the size of the notch in order from the upper absorber to the lower absorber. For example, when the absorbent article is composed of four layers of absorbers, the size of the notch is from the upper layer absorber side.
(Medium), (Large), (Small), (None)
It may be configured as follows. In the above description, the sizes of the first layer and the third layer, which are (medium) and (small), may be the same.
10. The cut roll set 52A, 52B may form a notch and may form a protrusion at an end different from the notch-side end. In this case, since the notch portion and the protruding portion are formed at the front and rear end portions, the front and rear end portions are cut along the joining portion into the shape of the notch portion and the protruding portion by the cut roll sets 52A and 52B of each layer. (Each layer is joined in this shape.) After the multilayer joining is performed, it is cut out into the shape of the multilayer absorber. The cutting after the multi-layer joining is performed on both sides where the cutting of each layer is not performed.
[0049]
【Example】
In the present embodiment, the multilayer absorbent article 1 having the same size and shape as the Lorié panty liner unscented type (manufactured by Kao Corporation; “Lorier” and “Lorier panty liner” are registered trademarks of Kao Corporation) is used. Produced.
[0050]
Upper layer absorber / intermediate layer absorber: Coat Ace CO30S / A18 manufactured by Unitika Ltd. (“Cot Ace” is a registered trademark of Unitika Co., Ltd.) for the surface layer, and NBF (SH) manufactured by Daiwa Spinning Co., Ltd. “NBF” is a registered trademark of Daiwa Spinning Co., Ltd.) 2 dtex × 51 mm fiber made into a non-woven fabric by an air through method, basis weight 20 g / m 2 ² The non-woven fabric was subjected to a hydrophilic treatment, and a leak-proof layer made of Asahi Kasei Co., Ltd. Eltasgard PMO17 ("Eltasgard" is a registered trademark of Asahi Kasei Corporation) having air permeability. In addition, for adhesion between the surface layer and the absorption layer and adhesion between the absorption layer and the leak-proof layer, a spiral made of Esdine 9172R manufactured by Sekisui Esdine (“Esdine” is a registered trademark of Sekisui Chemical Co., Ltd.) is used. 3g / m basis weight ² And used.
[0051]
Lower layer absorbent: Coat Ace CO30S / A18 manufactured by Unitika Ltd. for the surface layer, and NBF (SP) 2.2 dtex × 51 mm manufactured by Daiwa Spinning Co., Ltd. for the absorbent layer Nonwoven fabric made by air-through method with a basis weight of 40 g / m ² The nonwoven fabric was subjected to a hydrophilic treatment, and a breathable sheet KG4413 manufactured by Mitsubishi Chemical Corporation was used for the leak-proof layer. For the adhesion between the surface layer and the absorption layer and the adhesion between the absorption layer and the leak-proof layer, Sekisui Esdyne 9172R manufactured by Sekisui Sedine was spirally applied, and the basis weight was 5 g / m 2. ² And used.
[0052]
The peel strength between the upper absorber and the middle absorber was 106 cN, the peel strength between the middle absorber and the lower absorber was 138 cN, and the peel strength between the slip-resistant adhesive layer and the shorts was 277 cN. Was.
[0053]
【The invention's effect】
As described above, according to the multilayer absorbent article of the first aspect of the present invention, since the notch is provided in the absorber, the user can rely on the notch to make the uppermost layer 1. The absorber can be peeled off in order from the sheet.
[0054]
In the above aspect, when the shape and / or size of the cutout portions are formed so as to change in the order in which the absorbers are stacked, the shape and / or size of the cutout portions change in the order in which they are stacked. Thus, the absorber can be easily peeled off from the top in order.
[0055]
Furthermore, when the side in contact with the user's skin of the plurality of stacked absorbers is the upper layer side, when the peel strength between the plurality of stacked absorbers is set to be higher as going from the upper layer to the lower layer, The absorber can be easily and sequentially peeled off from the upper layer side having a small peel strength.
[0056]
Further, a shift preventing adhesive layer is provided on one of the outermost layers on the plurality of stacked absorbers, and the maximum peel strength between the absorbers is X, and the shift preventing adhesive layer is peeled from the Kanakin No. 3 cotton cloth. When the strength is Y and the minimum peel strength among the layers in the absorber is Z.
X <Y <Z
When the configuration is established such that the following relationship is established, first, peeling is sequentially performed between the absorbers where the lowest peel strength X is set, and finally, a peel strength Y higher than X is determined by the slip-resistant adhesive layer. Peeling is performed between the realized shorts and the bottom absorber. Further, since the peel strength Z between the respective layers of the absorber is set higher than these peel strengths, the structure inside each absorber is prevented from being broken by peeling even during the peeling.
[0057]
According to the production method of the second aspect of the present invention, it is possible to provide a method for efficiently producing the multilayer absorbent article of the first aspect.
[Brief description of the drawings]
FIG. 1 is a diagram showing one embodiment of a multilayer absorbent article according to the present invention.
2A is a plan view of the upper absorber, and FIG. 2B is a cross-sectional view taken along the line IIB-IIB in FIG.
FIG. 3 is a diagram showing a layer structure of a multilayer absorbent article.
FIG. 4 is a diagram showing a method for measuring peel strength.
FIG. 5 is a diagram schematically illustrating a process of manufacturing a multilayer absorbent article.
[Explanation of symbols]
1 multilayer absorbent articles
2 Upper absorber
3 Intermediate layer absorber
4 Lower layer absorber
5 Non-shift adhesive layer
21 Notch
22, 32, 42 Surface layer
23, 33, 43 Leak-proof layer
24, 34, 44 absorption layer

Claims (6)

A multilayer in which a plurality of absorbers each having a liquid-permeable surface layer, a liquid-impermeable leakproof layer, and an absorbent layer interposed between the surface layer and the leakproof layer and having a liquid retaining property are stacked. An absorbent article,
In the multilayer absorbent article, the absorbers are integrated by joining,
A multilayer absorbent article in which at least one of the plurality of stacked absorbers has a cutout. The multilayer absorbent article according to claim 1, wherein the shape and / or size of the cutout portion changes in the order in which the absorbers are stacked. When the side in contact with the user's skin of the plurality of stacked absorbers is the upper layer side, the peel strength between the plurality of stacked absorbers is set to increase from the upper layer to the lower layer. The multilayer absorbent article according to any one of 1 and 2. The plurality of stacked absorbers are provided with a slip-resistant adhesive layer on one outermost layer side, and the largest of the peel strengths between the absorbers is X, the slip-resistant adhesive layer and the kanakin No. 3 cotton cloth. X <Y <Z, where Y is the peel strength and Z is the minimum peel strength between the layers in the absorber.
The multilayer absorbent article according to any one of claims 1 to 3, wherein the following relationship is established. The multilayer absorbent article according to any one of claims 1 to 4, wherein the plurality of absorbers are integrated by joining the periphery except for the notch. A step of forming a plurality of absorbers each having a liquid-permeable surface layer, a liquid-impermeable leakproof layer, and an absorbent layer interposed between the surface layer and the leakproof layer and having a liquid retaining property; ,
A step of cutting out a part of at least one of the plurality of formed absorbers to form a cutout portion,
A step of integrally joining the plurality of absorbers,
A method for producing a multilayer absorbent article comprising:

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