JPS6026537B2 - sanitary products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides sanitary napkins, diapers, and
Concerning the improvement of sanitary products such as sanitary pads, especially sanitary napkins.

Conventionally, absorbent materials for sanitary napkins have generally been made of cellulose materials such as crepe paper, pulverized pulp, and cotton, as well as absorbent polymers, among which pulverized pulp, which is inexpensive, is most commonly used.

The crushed pulp is piled up on tissue paper,
It is used by wrapping it in tissue paper or folding it into multiple layers. However, although absorbent bodies made mainly of pulverized pulp have excellent absorption capacity and water absorption speed for body fluids, they have low diffusivity, so if they come into contact with a relatively large amount of body fluid locally at one time and are subjected to external pressure. Body fluids may flow back onto the surface of the napkin, causing discomfort to the user. For this reason, absorbers partially or completely pressed are in practical use, and although this press improves the diffusivity to a certain extent, it is still not satisfactory, and the absorber absorbs body fluids. Under these conditions, the elasticity is significantly reduced, and the layer is deformed and damaged by the pressure between the user's crotches, which may give the user a strong feeling of using the napkin and may cause leakage of bodily fluids. On the other hand, in order to improve the elasticity of the absorbent surface (facing the skin) of the napkin, hydrophilic fibers such as leon, or a low-density web-like layer mainly composed of such fibers, are coated on the inner surface of the water-permeable sheet that forms the surface of the napkin. Although the web-shaped layer has been put into practical use, its elasticity is halved when it comes into contact with body fluids.

The purpose of the present invention is to mainly improve the above-mentioned drawbacks of the conventional structure by forming an absorbent body having a specific structure in which a continuous filament toe of crimped acetate fibers is opened in the gunwale and pulverized pulp is roughly combined. The purpose of the present invention is to provide sanitary products and a method for manufacturing the same.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view of a sanitary napkin that is an example of the sanitary product of the present invention, and FIG. 2 is a sectional view taken along line 2-2 in FIG. 1.

Basically, the sanitary napkin 1 is made by laminating a water-impermeable sheet 3 on the lower surface of an absorbent body 2 and on both sides in the middle direction, and covering this laminate with a water-permeable sheet 4 to cover both ends 4a in the middle direction. It is constructed by overlapping and thermally welding the overlapping green parts 4b in the longitudinal direction, and the upper part is the absorption side in the figure.

Although not shown, the water-impermeable sheet 3 extends outward without being bent inward on both sides of the water-permeable sheet 4, and both sides of the water-permeable sheet 4 are bent inward. Alternatively, the flap may be formed by extending outward substantially in the same direction as the water-impermeable sheet 3, and engaging these two extensions with each other to form a flap. Such a form is suitable as a sanitary napkin, but is particularly suitable as a diaper. The water-impermeable sheet 3 may be made of a synthetic resin film, waterproof paper, or a laminate sheet of a synthetic resin film and paper or non-woven fabric, which is generally used as a menstrual blood leak-proof sheet for sanitary napkins, singly or in combination. Also, as the water-permeable sheet 4, a nonwoven fabric that is generally used as an exterior material for sanitary napkins can be used.

The absorbent body 2 is composed of a continuous filament tow of crimped acetate fibers, and pulp obtained by crushing a pulp sheet with a hammer mill or the like.

This continuous filament tow of longitudinally wound acetate fibers is
It is used as a material for cigarette filters and is highly safe: It has hydrophilic stems and hydrophobic groups, and its absorption capacity and water absorption rate are inferior to fiber-based materials such as pulp and rayon, but
Will not lose pigs under wet conditions; has tens of crimps per inch heat-fixed, high windability;
It has a low apparent density and is bulky, and since it has a hydrophobic group, its bulkiness is maintained even under wet conditions;
This characteristic makes it suitable for use as a material for the absorbent body 2 in combination with pulverized pulp. Figures 31A to 3
-C is a schematic illustration of the absorbent body 2 made of the above-mentioned material cut in the middle direction.

In the figure, reference numeral 5 indicates a continuous filament tow of crimpable acetate fibers expanded to a substantially uniform density (
The continuous filament layer (hereinafter referred to as a continuous filament layer) is shown by three staggered lines, and the continuous filaments are arranged in the longitudinal direction of the napkin 1 so as to be parallel to the long sides of the napkin 1. There is. The absorbent body 2 according to the embodiment shown in FIG. press (enboss)
Alternatively, each laminate 7 is formed by pressing and integrating the entire laminate 7, and each laminate 7 is formed into two upper and lower layers so that one side of the continuous filament layer 5 on which the pulverized pulp layer 6 is not laminated is placed on the upper surface. The upper laminate 7 is arranged such that the upper surface of the upper laminate 7 is in contact with the upper inner surface of the water permeable sheet 4.

The absorbent body 2 of the embodiment shown in FIG.
The pulverized pulp layer 6 laminated on one side of the
It is equipped with a laminate 8 which is partially or entirely pressed and integrated as in the embodiment shown in Fig. A, and the laminate 8 is formed so that a part of one side of the continuous filament layer 5 on which the pulverized pulp layer 6 is not laminated is the outer surface. The laminate 8 is folded into three layers, that is, one end of approximately one-third of the laminate 8 is bent toward the pulverized pulp layer 6 and superposed thereon. With,
Similarly, approximately one-third of the pond end is bent toward the pulverized pulp layer 6 side and superimposed on the one end, so that the upper or lower surface of this laminate 8 is in contact with the upper inner surface of the water-permeable sheet 4. It has been placed.

The absorbent body 2 of the embodiment shown in FIG.
An embodiment shown in FIG. 3-A in the thickness direction of a pulverized pulp layer 6 laminated on one side of the pulverized pulp layer 6 and an absorbent sheet 10 of tissue paper or the like laminated on this layer 6 and having approximately the same thickness as the continuous filament layer 5. The laminate 9 is partially or completely pressed and integrated in the same manner as the laminate 9. This laminate 9 is folded into three layers as shown in FIG. 3-B, and the upper or lower surface of the laminate 9 is is arranged on the upper inner surface of the water-permeable sheet 4.

In any of the embodiments of the absorbent body 2 shown in FIGS. 3-A to 3-C, the pulverized pulp layer 6 is not only simply laminated and integrated on one side of the continuous filament layer 5, but also the pulverized pulp layer 6 is integrated with the continuous filament layer 5. 6 is interposed between the inner fibers of the continuous filament layer 5.

Although not shown, an appropriate amount of absorbent polymer powder may be mixed into the pulverized pulp layer 6 to increase the absorption and retention ability of the absorbent body 2. In addition, it is preferable that the water absorbent sheet 1 is pressed and integrated with the continuous filament layer 5 and the pulverized pulp layer 6 as described above, but it is preferable that the pulverized pulp layer 6 is simply pressed.
There may also be a mirror layer. FIG. 4 schematically illustrates an example of an apparatus for manufacturing the napkin 1 equipped with the most preferred embodiment of the absorbent body 2 shown in FIGS. 31B and 31C, and FIG. is a partially supplementary explanatory diagram of FIG. 4.

The continuous filament toe 11 of crimpable acetate fiber is
The bale 12 is taken out by a ring 13 to prevent twisting and the like and guided to the primary air seal 14.

For example, the device 14 mainly includes a pair of opposing parallel parts provided with a plurality of jet holes connected to compressed air pipes, and first opens the toe 11 in the desired band shape with compressed air from the jet holes. fiber. Next, this tow 11 is moved to the guide roll 1
5a, 15b, each pair of presser rolls 16a, 16
b and drive rolls 17a, 17b. Drive roll 17
a, 17b have a higher circumferential speed than the presser rolls 16a, 16b, and are provided with grooves preferably at an angle to the roll axis on the circumferential surface of one or both of them,
Therefore, the tow 11 is pulled out from the bale 12 by the drive rolls 17a, 17b, and the tow 11 is pulled out from the bale 12 by the drive rolls 17a, 17b.
A stretched portion and a non-stretched portion are created between the roller b and the drive rolls 17a and 17b, and as a result, it becomes easier to expand in the middle direction. The toe 11 that has left the drive rolls 17a, 17 is guided to the secondary air opening device 18 which has the same mechanism as the primary air opening device 14, where it is finally shown in FIG. 3-A described above. The fibers are expanded to a substantially uniform density similar to that of the continuous filament layer 5 shown in FIGS. 3-C. Incidentally, the device 18 is equipped with a guide for regulating the expansion, and by adjusting this guide, it is possible to weave the gunwale as desired. The toe 11a (the elongated object of the continuous filament layer 5 shown in FIGS. 31A to 3-C) which is continuously expanded into a belt shape in this way is attached to the upper surface of the porous Kosobea 19. The pulverized pulp 21 (in some cases, a mixture with absorbent polymer powder) is substantially uniformly spread and laminated on the upper surface of the tow 11a by a scale fiber device such as a hammer mill or a spreading device connected thereto. A part of the pulverized pulp 21 is sucked by a suction 22 disposed on the lower surface of the porous conveyor 19, and is interposed between the internal fibers of the tow 11a.

When forming a laminate 8 as shown in FIG. 3-B, the laminate 8 as shown in FIG. When forming a layer of pulverized pulp 21, the absorbent sheet 25 is further unwound from the first unwinding roll 24, folded, and pressed as described above to be integrated. In this way, a first laminate 26 is formed, and this is passed through the first guide 27.
Then, fold it into three layers as shown in FIG. 3-B or 3-C. The first guide 27 is, for example, shown in FIG. 3-B and FIG.
A channel having a cross-sectional shape similar to the folded cross-sectional shape of the laminated bodies 8 and 9 in FIG. C is provided, and the primary laminated body 26 is forced to pass through this channel. A water-impermeable sheet 29 is unwound from the second unwinding roll 28 onto the folded primary laminate 26, and the upper surface and both sides of the primary laminate 26 are guided by a second guide (not shown). A second laminate 30 is formed by stacking the laminate so as to wrap it (see reference numeral 3 in FIG. 2). This secondary laminate 30 is guided to a primary cutting device 32 by a belt conveyor 31, and is cut at regular intervals to form each unit laminate 33. These unit laminates 33 are spaced apart by a certain distance due to the speed difference between the cutting and the belt conveyor 34, and a water-permeable sheet 36 is unwound onto each of these unit laminates 33 from a third unwinding roll-35. The entire body 33 is guided by a third guide (not shown)
(see reference numeral 4 shown in FIG. 2) and guided to a welding machine 37 by a belt conveyor 34, and each unit laminate 33
The water-permeable sheet 36 between them is allowed to settle down, and then guided to a second cutting device 39 by a conveyor 38 to cut the customer garment part to form a final product 40 (see reference numeral 1 shown in FIG. 1). is transferred to the packaging process.

Note that the secondary guide and the tertiary guide, for example,
A channel having a cross-sectional shape similar to the folded cross-sectional shape of each of the water-impermeable sheet 3 and the water-permeable sheet 4 shown in FIG. It is made to pass through. According to the sanitary product of the present invention, which includes an absorbent body having the above configuration, a part of the absorbent body is constituted by a continuous filament layer of crimp acetate fibers having the various properties described above,
Furthermore, at least a portion of the continuous filament layer is left on the absorption side of the sanitary product, thus improving the diffusibility of body fluids and effectively preventing backflow to the absorption side; The absorbent material is bulky and its volume increases, increasing its absorption capacity for body fluids: the elasticity of the absorbent material;
Therefore, the elasticity of the sanitary product as a whole is improved, and it fits softly and closely to the user's skin, causing less discomfort to the user. The creases and folds caused by folding and compression almost return to their original state after the compression is released: Even when the absorbent absorbs body fluids, it maintains the bulkiness and elasticity mentioned above, which makes it difficult for the user's movements and groin pressure. It has a number of advantages that cannot be obtained with conventional sanitary products, such as less deformation and breakage due to oxidation, and excellent shape retention.

Example 1 The napkin shown in FIGS. 2 and 3-C using a continuous filament toe of crimped acetate and pulverized pulp as an absorbent material was made using the apparatus shown in FIG. 4.

As the continuous filament toe of the crimpable acetate fiber, one manufactured by Mitsubishi Acetate Co., Ltd., Z-25000 total denier was used. A laminate sheet of polyethylene film and paper was used as the water-impermeable sheet, and a nonwoven fabric was used as the water-permeable sheet. As a comparative product, a napkin was made using tissue paper instead of the acetate fiber. The comparative test results are shown below. Table 1 (Note) ◎ indicates better than ○.

(Note) Table 2 shows the water absorption capacity measured based on the sanitary treatment product standard K. Table 3 4 (Note) Table 4 shows 2g/1 sheet of 10
Measurement of bulk when stacked.

Table 5 (Note) In Table 5, 5 pieces of dye solution were dropped onto the sort in Table 4 above as an absorber, and the elasticity after absorbing the dye solution was measured.

BRIEF DESCRIPTION OF THE DRAWINGS: FIG. 1 is a perspective view of a sanitary napkin as an example of the sanitary product of the present invention.

FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. 31A to 3-C are schematic diagrams of the absorbent body cut in the middle direction. FIG. 4 is a schematic diagram showing an example of manufacturing the sanitary product of the present invention. FIG. 5 is a supplementary explanatory diagram of FIG. 4. 1...
Napkin, 2...Absorber, 3...Water-impermeable sheet, 4...Water-permeable sheet, 5...
Continuous filament layer, 6... Crushed pulp layer, 7, 8
, 9... Laminate, 14... Air opening bag, 16a, 16b... Presser roll, 17a,
17b... Drive roll, 18... Air opening traverse device, 19... Porous conveyor, 20...
... Hammer mill, etc., 21 ... Pulverized pulp, 22 ... Suction, 23 ... Press roll, 25.
...Water absorbent sheet, 27...Guide, 2
9... Water impermeable sheet, 32... Cutting device, 36... Water permeable sheet, 37...
- Heat welding and counterfeiting, 39... Cutting device.

Figure 1 Figure 2 Figure 8-A Figure 31B Figure 31C figure size the gunwale figure eye ball

Claims (1)

[Scope of Claims] 1. A sanitary product comprising a water-impermeable sheet laminated on at least the lower surface of the absorbent body, and a water-permeable sheet covering at least the top surface and peripheral side of the laminated body, wherein the absorbent body comprises: At least two continuous filament layers of crimped acetate fibers and a layer of ground pulp laminated to the lower surface of each of the layers and interposed within the layers are partially or completely pressed in the thickness direction. combined to form a laminate, the continuous filament layers of the laminate being oriented along the length of the sanitary article;
A sanitary product characterized in that the continuous filament layer located on the uppermost surface and the inner surface of the water permeable sheet are arranged so as to be in contact with each other at least on the absorption side of the sanitary product. 2. The absorbent body consists of a continuous filament layer of crimped acetate fibers, a pulverized pulp layer laminated on one side of this continuous filament layer, and an absorbent sheet laminated on this pulverized pulp layer, partially or completely in the thickness direction. The sanitary product according to claim 1, characterized in that the sanitary product is integrally formed using a mechanical press. 3. The sanitary product according to claim 1, wherein the absorbent body is formed by folding into multiple layers such that the continuous filament layer of crimp acetate fibers located on the uppermost surface is located on the outside.