JP3340731B2 - Multi-layer sanitary products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sanitary product that is convenient for use.

[0002]

2. Description of the Related Art At present, the mode of use of feminine hygiene products is as follows.
Even if the absorption capacity of the liquid absorber sheet remains,
There is a tendency to replace with new sanitary products each time the toilet is used, and to throw away used ones. Conventionally, the emphasis of development has been on increasing the absorption capacity of the liquid absorbent sheet for sanitary products, but from the point of view of this woman, it is meaningless to increase the absorption capacity any further. Will be. By the way, although recent sanitary products have become very compact, they have to be replaced every time the toilet is used, so that several extra sanitary products must be carried around when going out, which is bulky and inconvenient. For this reason, the inconvenience that various restrictions are imposed on storage of sanitary products when dressing with regard to fashion such as formal wear, such as preparing a handbag separately, than in normal times. In addition, female students who have a large amount of shame tend to dislike long toilets, and they also carry sanitary products, use them in schools and on travel, and place them in narrow places where time is limited and where there are limited breaks. It took a long time and was inconvenient to replace.

[0003]

SUMMARY OF THE INVENTION The present invention eliminates the need to carry a large number of replacement sanitary products, and requires a complicated installation and bonding operation to a predetermined position of underwear once per a plurality of composite absorbent sheets. It is another object of the present invention to provide a multi-layer sanitary product that can greatly reduce the time required to replace it with a new composite absorbent sheet.

[0004]

DISCLOSURE OF THE INVENTION The present inventors have found that the advancement of liquid absorbing materials made of a water-absorbing polymer makes the liquid absorbing sheet extremely thin and has a large absorbing capacity. Even if two or five identical sheets are stacked on the liquid absorbing sheet portion of a sanitary product that is used up once per package, the unabsorbed liquid absorbing sheet has a very small thickness. Does not increase much,
The point that there is almost no change in the feeling of wearing and appearance, and if a liquid absorbing sheet is used in which 2 to 5 identical absorbent sheets are stacked on a known liquid absorbing sheet in a state where each sheet is individually separated. By simply peeling off only the upper layer of the used liquid absorbing sheet, the completely clean sanitary article underneath is exposed, and a new sanitary article can be quickly replaced. As a result, the conventional package can be used in one package.
Focusing on the point that up to 5 sanitary products can be mounted, and it is not necessary to carry a spare sanitary product package. Based on this idea, we have conducted intensive research, and it is easy to remove the used upper liquid absorbing sheet. The present invention provides a multilayered sanitary product having a laminated liquid absorbing sheet which is convenient for manufacturing, and a method for manufacturing the same. Conventionally, the technical idea of making the liquid absorbing sheet a multilayer for the purpose of increasing the absorption amount or preventing the side leakage has been put to practical use, but the liquid absorbing sheet in which the absorbing liquid of the upper liquid absorbing sheet is laminated on the lower layer. Structure that does not penetrate into the liquid absorbing sheets, that is, a laminated structure in a separated state by a blocking layer through which liquid does not permeate between the liquid absorbing sheets. There is no known lamination structure that is easy to remove. That is, the present invention consists of the following items. (1) On the lower composite absorbent sheet having substantially the same size as the lower backing sheet having the lower backing sheet on the back side, and on the lower composite absorbing sheet having the upper backing sheet on the back side, the upper composite absorbent sheet having substantially the same size as the upper backing sheet. In the laminated structure of two or more composite absorbent sheets, the sheets are stacked with the back side facing down, and the periphery of the lower backing sheet and the periphery of the upper backing sheet are temporarily fixed to each other. A multi-layer sanitary product characterized by having a function of attaching to underwear on the back surface of the lowermost backing sheet of the lowermost composite absorbent sheet. (2) The multilayer sanitary product according to (1), wherein two opposing edges of the peripheral edges are temporarily fixed. (3) The first or second item, wherein the lower backing sheet of the lower composite absorbent sheet and the upper backing sheet of the upper composite absorbent sheet are fitted and temporarily fixed on the uneven surface formed by the uneven surface of the pressure press. The multilayer sanitary article according to the item. (4) The attachment function to the undergarment wherein the release paper coated with a pressure-sensitive adhesive is attached to the back surface of the lowermost backing sheet of the lowermost composite absorbent sheet, or 4. The multilayer sanitary article according to claim 3. (5) The first and second items in which the composite absorbent sheet is color-coded
Item 5. The multilayer sanitary product according to item 3, 3 or 4.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The material, shape and structure of a known liquid absorbent sheet of a sanitary product can be used without any particular limitation for the liquid absorbent sheet used in the sanitary product of the present invention. As the material of the liquid absorbing sheet, a cloth or nonwoven fabric or cotton made of a known and used water-absorbing polymer, which is thin and has a large absorbing capacity, can be particularly preferably used. Sanitary items are usually
A liquid absorber sheet is placed on the backing sheet, an anti-return sheet for absorbing liquid is laminated thereon, and a porous film is further laminated thereon, and the peripheral edge of the porous film is the peripheral edge of the backing sheet. The liquid absorbing sheet body is wrapped from above and below with a backing sheet and a porous film. In the present invention, the liquid absorber sheet and the backing sheet on which the liquid absorber sheet is placed are essential components. Although a laminated structure such as a porous film on the upper surface is suitable, it is not always essential, and other forms of structure can be used in the present invention. Therefore, in the present invention, the entire laminate in which the liquid absorber sheet is placed on the backing sheet is defined as a composite absorbent sheet. In this case, on the surface side of the periphery of the backing sheet,
Although a porous surface film or the like may not be laminated, such a laminated sheet is regarded as a peripheral edge of the backing sheet, and a surface film or the like integrally adhered to the surface side of the peripheral edge of the backing sheet is , Can be regarded as the surface of the backing sheet. Further, in the present invention, in order to compensate for the absence of wrapping paper when only the upper composite absorbent sheet is peeled off and discarded, it is more preferable to attach a waste packaging sheet to the composite absorbent sheet, particularly to the backing sheet. For example, a perforation may be formed at the center of the film laminated on the back surface of the backing sheet, or the like, and a perforated portion may be used as a storage opening, or one free edge of the film on the back surface may be used as a storage opening, and By turning over the front side, the composite sheet main body can be stored and packaged in the film. Therefore, the composite absorbent sheet according to the present invention also includes a laminate of a minimum structural unit in which a liquid absorbent sheet is simply laminated on a backing sheet, and a liquid absorbent sheet, a reversion preventing sheet, a porous sheet, and a backing sheet. In some cases, a composite sheet is obtained by laminating a functional film and other functional sheets.

[0006] Here, the porous film means a sheet through which liquid can pass, and in fact, not only a film having countless fine holes, but also a film through which liquid can pass without resistance even without fine holes. For example, a paper sheet having good liquid permeability also corresponds to the concept of the porous film of the present invention. The porous film used in the present invention is desirably a thermoplastic resin film from the viewpoint of liquid permeability and processability.
In a preferred embodiment of the sanitary product of the present invention, the upper backing sheet of the second and third composite absorbent sheets is temporarily fixed on the lower peripheral backing sheet periphery of the liquid absorbent sheet of the lower composite absorbent sheet. Consists of two or more laminates of the composite absorbent sheet, the periphery of which is temporarily fixed. In addition, as shown in FIG. 1, when the backing sheet has substantially the same dimensions as the liquid absorber sheet, temporary fixing between the peripheral edge of the surface of the lower composite absorbent sheet and the peripheral edge of the back surface of the upper composite absorbent sheet is performed. A laminate of the above composite absorbent sheet can be obtained. In the present invention, the temporary fixing between the lower layer composite absorbent sheet and the upper layer composite absorbent sheet is stably and firmly fixed in the portable state and the sanitary article mounted state, but at the time of replacement,
In this state, the upper composite absorbent sheet can be easily detached from the lower composite absorbent sheet with a finger. In this way, when removing the upper composite absorbent sheet, the lowermost backing sheet of the lowermost composite absorbent sheet of the sanitary product of the present invention and the fixation of the underwear to the lowermost composite absorbent sheet are kept as they are, and the top most used absorbent article is used. In this state, the composite absorbent sheet can be detached by peeling it off with a finger. The temporary fixing used in the present invention is characterized in that mechanical crimping is used. At the time of mechanical crimping, for example, other than temporarily fixing only by mechanical crimping,
It can be used together with temporary fixing with a weak adhesive. Further, as another aspect, for example, a method of temporarily fixing the entire periphery or the center of the back surface of the upper composite absorbent sheet directly to the surface of the lower composite absorbent sheet with an adhesive together with the temporary fixing of the mechanical pressure bonding at the periphery of the lower composite absorbent sheet. There is also an embodiment in which they are used in combination.
As the adhesive in this case, a heat-sensitive adhesive is preferable because the surface of the lower composite absorbent sheet after peeling is not sticky.

[0007] Such a temporarily fixed state that can be removed is as follows.
For example, it can be achieved by fixing with a weak bonding force between the periphery of the lower backing sheet or the periphery of the surface of the liquid absorber sheet and the periphery of the backing sheet of the lower composite absorbent sheet. This temporary fixing does not necessarily have to be performed on the entire periphery of the periphery, and a part of the periphery may be separated so as to be easily separated. However, since it is necessary that the temporary fixation is performed temporarily during use, if the temporary fixation is temporarily fixed only at one edge of the composite absorbent sheet, the laminating position is unstable. It is desirable that the peripheral edge is temporarily fixed at least at two opposing edges. As the temporary fixing method, a method of partially bonding only the periphery of the composite absorbent sheet with a pressure-sensitive adhesive (adhesive) capable of repeating adhesion and peeling, and the method of bonding the back surface of the upper composite absorbent sheet with a weakly adhesive pressure-sensitive adhesive are used. Easy bonding method with the entire surface of the lower composite absorbent sheet, thermo-compression bonding method using a heat-sensitive adhesive that cannot repeat bonding and peeling, semi-welding method of the periphery with anti-fusing agent interposed, and easy separation and cutting of film When the temporary fixing is separated, such as a non-repeatable crimping method that compresses at high pressure without using an adhesive, the temporary fixing with no adhesive force remaining on the lowermost backing sheet side used continuously Various methods are conceivable. The temporary fixing of the present invention is to fix by mechanical crimping, and furthermore, the mechanical crimping is performed by the lower backing sheet of the lower composite absorbent sheet and the upper backing sheet of the upper composite absorbent sheet by the uneven surface of the crimping press. It is a desirable mode that it is fitted and temporarily fixed by the formed uneven surface. Further, as the temporary fixing method of the present invention, the various temporary fixing means described above can be used simultaneously with the mechanical crimping. For example, it is possible to use a method in which one edge is temporarily fixed by a crimping method, and the other edge opposed thereto is temporarily fixed by a pressure-sensitive or heat-sensitive adhesive. These temporary fixing methods can be performed at the periphery of the backing sheet. In particular, in these temporary fixing methods, when a heat-sensitive adhesive layer, a weak adhesive pressure-sensitive adhesive layer, and the like are used in combination for mechanical pressure bonding, the surface of the lower composite absorbent sheet after peeling does not stick. It is suitable.

The structure of the composite absorbent sheet used in the sanitary napkin of the present invention, the mechanism for fixing the composite absorbent sheet to underwear, the mechanism for preventing reverse movement and the side leakage are not known, and are known unless the object of the present invention is impaired. The structure of the sanitary product can be adopted without any particular limitation. A preferred embodiment of the single-layer composite absorbent sheet constituting the multilayer sanitary article of the present invention has substantially the same structure as a known sanitary article, that is, the dimensions of the backing sheet are substantially the same as those of the liquid absorbent sheet. It can be suitably used similarly to the case where the peripheral edge of the backing sheet protrudes from the peripheral edge of the composite absorbent sheet and the liquid absorbent sheet of the same size. A known fixing mechanism, such as a pressure-sensitive adhesive layer, is provided on the back surface of the backing sheet of the lowermost composite absorbent sheet used in the present invention, for example, in order to fix the underwear cloth at a specific place. In particular, a material in which a pressure-sensitive adhesive layer is provided and a release paper is adhered thereon can be suitably used. In use, the release paper can be peeled off and adhered to a predetermined position of the underwear cloth.
As the backing sheet of the composite absorbent sheet used in the present invention, those having known shape materials can be used. The backing sheet of the composite absorbent sheet used in the present invention functions as a backing sheet for fixing the liquid absorber sheet, but serves to fix or package the liquid absorber sheet and is separated from the liquid absorber. Any of the above-described and integrally formed embodiments can be used.
The backing sheet of the present invention should be made of a material that does not cause the liquid absorbed by the liquid absorber sheet to further exude on the back surface, such as a thin resin film, a paper sheet or a nonwoven fabric laminated with an ultra-thin resin film, or A water-repellent paper sheet or nonwoven fabric can be used. In the case of a paper sheet or a non-woven fabric, there is an advantage that, at the time of disposal, it flows in a slurry state with water from a flush toilet.

The lowermost backing sheet to be the bottom of the multilayer sanitary product of the present invention needs to have a mechanism for fixing the lowermost backing sheet at a predetermined position of the underwear. As this mechanism, a known sanitary product mechanism can be used without any particular limitation. For example, a mechanism may be employed in which a pressure-sensitive adhesive layer is provided on the entire surface of the lowermost backing sheet, or at the center or on the periphery, and the pressure-sensitive adhesive layer is adhered and fixed at a predetermined position on the undergarment. This pressure-sensitive adhesive layer is designed so that a release paper is stuck on the surface of the adhesive layer until immediately before use so that it does not adhere to other parts. In use, the release paper is peeled off and accurately attached to the underwear. As the composite absorbent sheet of the present invention, those having completely the same material and the same dimensions can be used. But,
If desired, the material, dimensions, and thickness of the liquid absorber sheet can be changed. Thereby, the absorption amount of the liquid absorbing sheet can be appropriately adjusted according to time. Further, when several liquid absorbing sheets are stacked, it is convenient to inform the number of remaining layers by changing the color of the liquid absorbing sheet or the backing sheet. The role and material of the backing sheet of the upper composite absorbent sheet of the present invention are substantially the same as those of the lowermost backing sheet. However, instead of a mechanism for fixing to the underwear provided on the back of the lowermost backing sheet, a mechanism for temporarily fixing to the predetermined position of the lower composite absorbent sheet or directly to the underwear fabric is required on the back of the upper backing sheet Becomes The present invention will be described in more detail with reference to the drawings of embodiments. The invention is not limited by the drawings of this embodiment. FIG. 1 shows an embodiment in which three layers of composite absorbent sheets 1, 2, and 3 are temporarily fixed by temporary fixing K. FIG. 1 shows backing sheets 11 and 2
1 and 31 are substantially the same as the dimensions of the liquid absorber sheets 10, 20, and 30, and the temporary fixing K between the peripheral edge of the front surface of each lower composite absorbent sheet and the peripheral edge of the back surface of each upper composite absorbent sheet. Thus, a laminated body of a three-layer composite absorbent sheet is formed.

The embodiment of the present invention shown in FIG. 2 is an embodiment in which the temporary fixing shown in FIG. 1 is performed by mechanical crimping. The mechanical crimping used in the embodiment of FIG. 2 is performed by using a known high-pressure crimping method used for a laminated postcard or the like and a normal high-pressure crimping method in which a slight adhesiveness is applied to a crimping surface and a pressing surface having an uneven surface. A method can be used in which a groove or a concave surface is formed on the crimped surface by crimping, and temporarily fixed by the fitting action of the unevenness. This temporary fixing by mechanical crimping can be adopted particularly easily when the material of the backing sheet of the composite absorbent sheet is rigid such as paper or synthetic paper. FIG. 2 shows a multi-layered sanitary product in which the backing sheet has the same dimensions as the liquid absorbent sheet of FIG. FIG. 2 shows a case where both side edges of the composite absorbent sheet are temporarily fixed by mechanical crimping portions C. FIG. 2 (a) is a longitudinal sectional view, and FIG. 2 (b) is a transverse sectional view. FIG. 2C is a rear view, and the center of the rear surface is a release paper B.
, And a pressure-sensitive adhesive layer is provided between the pressure-sensitive adhesive layer and the back surface in contact with the release paper B. Further, FIG.
(D) In the state where the composite absorbent sheets 1, 2 and 3 are laminated, one or three edges of the backing sheet are mechanically pressure-bonded to form an end of the laminated composite absorbent sheet which is not temporarily fixed by pressure bonding. The ends of the backing sheets 31 and 21 are extended to form tabs T and t.
FIG. 9 is a cross-sectional view showing an aspect in which the length is sequentially increased from the top by providing the above. When there is a step in the length of the end portion, it is convenient to sequentially peel off the used sheets from the tabs T and t. FIG. 3 shows that the composite absorbent sheet is crimped in the groove-shaped concave portions D along both side edges and temporarily fixed in an uneven shape. The laminate can be temporarily fixed by pressing with a press having convex protrusions. This is particularly effective when the backing sheet is made of a rigid material such as paper. Instead of the circular uneven portion, a groove-shaped uneven shape is also suitable. In this embodiment, since the outer periphery of the uneven portion is free, the used composite absorbent sheet can be easily peeled off with a finger. Furthermore, if the mechanical pressure bonding and the heat-sensitive adhesive layer or the weak adhesive pressure-sensitive adhesive are used together with the multilayer sanitary article of the present invention, the backing sheet and the upper surface of the composite absorbent sheet are completely adhered and temporarily fixed. Can be. When laminating multi-layered sanitary products of this type, the peeling operation can be facilitated by slightly displacing the composite absorbent sheet and providing a step on one edge.

[0011]

According to the multilayer sanitary article of the present invention, the composite absorbent sheets can be removed in order from the upper layer by temporarily fixing the peripheral edges of the composite absorbent sheets by mechanical crimping. Eliminates the need to carry supplies. For example, using two layers of sanitary products would reduce the number of carrying items to less than half, and three layers would reduce the number to less than one third.
Also, in the toilet, when the used liquid absorbent sheet is removed, the position of the lowermost composite absorbent sheet in the underwear of the backing sheet does not change at all. By simply peeling off the absorbent sheet, the composite absorbent sheet of the next layer is arranged at an accurate position. Whereas conventional sanitary products require removal from underwear and accurate operation of attaching to underwear when replacing in a narrow place when going out, the multilayer sanitary product of the present invention requires only one peeling, and it is a leap. There is an advantage that the time can be shortened.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one example of a basic structure of the present invention.

FIG. 2 is a cross-sectional view (a), a vertical cross-sectional view (b), and a rear view (c) of a multilayer sanitary product according to another embodiment of the present invention;
(d) is a longitudinal sectional view of the multilayer sanitary product of another embodiment.

FIG. 3 is a plan view (a) and a cross-sectional view (b) of a multilayer sanitary product according to another embodiment of the present invention.

[Description of Signs] 1 Composite absorbent sheet 2 Composite absorbent sheet 3 Composite absorbent sheet 4 Peripheral edge 10, 20, 30 Liquid absorbent sheet 11, 21, 31 Backing sheet 12, 22, 32 Surface film A Pressure-sensitive adhesive layer B Release paper C Mechanical crimping D Groove row-shaped concave part K Temporary fixing T tab t tab

Continuation of the front page (56) References JP-A-9-271490 (JP, A) JP-A-10-24061 (JP, A) JP-A-61-145528 (JP, U) International publication 95/29655 (WO, A1) (58) Field surveyed (Int. Cl. ⁷ , DB name) A61F 13/15-13/84

Claims (5)

(57) [Claims] 1. An underlayer backing sheet having an underlining sheet on the backside.
Above the lower composite absorbent sheet of almost the same dimensions as the upholstered sheet
The upper backing sheet having an upper backing sheet on the back side.
Two or more composite absorbent sheets with the upper layer composite absorbent sheet of approximately the same size as the upper layer laminated with the back side down, and the peripheral edge of the lower layer backing sheet and the peripheral edge of the upper layer backing sheet of the upper composite absorbent sheet temporarily fixed together A multilayer sanitary product comprising a sheet laminated structure, wherein the temporary fixing is performed by mechanical pressure bonding, and has a function of attaching to the underwear on the back surface of the lowermost backing sheet of the lowermost composite absorbent sheet. 2. The multilayer sanitary product according to claim 1, wherein two opposite edges of the peripheral edges are temporarily fixed. 3. The lower backing sheet of the lower composite absorbent sheet and the upper backing sheet of the upper composite absorbent sheet are fitted and temporarily fixed on the uneven surface formed by the uneven surface of the pressure press. 2. The multilayer sanitary article according to 2. 4. A function of attaching to underwear, wherein a release paper coated with a pressure-sensitive adhesive is adhered to the back surface of the lowermost backing sheet of the lowermost composite absorbent sheet. 3. The multilayer sanitary article according to 3. 5. The multilayer sanitary article according to claim 1, wherein the composite absorbent sheet is color-coded.