JPS5919681Y2 - paper diaper - Google Patents

Description

[Detailed Description of the Invention] This invention relates to improvements in disposable diapers.

The water-absorbent layer of disposable diapers is composed of a laminated layer of water-absorbent paper, a crushed pulp layer (usually the top and bottom surfaces of the pulp layer are covered with thin water-absorbent paper), or a combination of both, and the layer thickness of the water-absorbent layer is thin. The water from the excrement immediately seeps into the edges of both sides, making the area around the base of the foot sticky and uncomfortable.

For this reason, the overall thickness of the water-absorbing layer is increased to absorb more water in the center and reduce the amount of water that seeps into the side edges, but in this case, the amount of material used for the water-absorbing layer increases, resulting in higher costs.

Furthermore, in Japanese Patent Application Laid-Open No. 52-118358, a special chemical solution for preventing moisture seepage is attached in a linear manner on both sides of the central part of the water-absorbing layer, so that the water of excrement permeates to both sides of the water-absorbing layer. Although it has been proposed to prevent this from occurring, it requires the use of expensive chemicals and the addition of equipment to apply the chemical in a linear manner to the water absorption layer, which also increases costs.

As shown in Figure 6, the inventor presses a part of the water absorption layer into a line to form a compression line a, and drops water at a point away from the compression line to drain the water into the water absorption layer. When we observed the situation, we found that among the water C seeping and spreading around the point, the water that came towards the compression line a stopped once it reached the compression line a (Figure 7), and then stopped at the compression line a. It was found that the liquid seeped along the inside of the area, and after a while, it seeped out little by little beyond the compression line a (Fig. 8).

This is the same whether the water absorbing layer is a layer of absorbent paper or a layer of crushed pulp.In particular, the water absorbing layer is formed by applying hot melt adhesive and pressing while heating a compression wire. It was also found that by melting the hot melt adhesive along the compression line and attaching the water absorption layer, the amount that seeped out beyond the compression line was reduced.

Therefore, in the present invention, the thickness of the central part of the water absorption layer is made thicker than that of both sides, and the above-mentioned compression line dams are formed along the boundaries between the central part and each side, so that the water is not excreted in the central part. The water from the excrement seeps out to both sides of the water-absorbing layer and is stagnated at the dam, and the thick central part, which has high water-absorbing power, absorbs as much water as possible, and at the same time, when worn, etc. This prevented the water absorption layer from shifting laterally.

Then, the surface paper and the water absorbing layer are pressed into a line shape that intersects with each other, and a linearly compressed moisture permeation inducing part is provided over the entire area of each side.
The water that seeps into each side beyond the dam is dispersed over the entire area of each side along the permeation guiding part, and prevents both edges of the side where excretion is performed from getting wet in a concentrated manner. It was prevented.

In the drawing, 1 is a back sheet, 2 is a front paper, and 3 is a water absorption layer. The surface paper is made of relatively strong rayon paper, which is resistant to tearing even when wet and rubbed against the skin, or one or two sheets of water-soluble wet-processed paper, or water-insoluble dry-processed nonwoven fabric.

In the embodiment shown in FIGS. 1 to 3, the length in the longitudinal direction of the back sheet 1 and the front paper 2 is slightly longer than the water absorption layer 3, and the front paper 2 has approximately the same width as the water absorption layer 3, but the back sheet 1 The back sheet 1 is slightly wider than the water absorbing layer 3 and the front sheet 2, and has overlapping parts 1' and 1' overlapping in a folded manner on both sides of the water absorbing layer. Wrap both sides of the water-absorbing layer 3 with the polymerized parts 1' and 1' of ~1, overlay the top paper 2 on top, and heat the ends of the back sheet 1 and the top paper 2 that protrude from both ends of the water-absorbing layer 3. , the binding portions 4, 4 made of holt-melt glue or the like are used to encapsulate the water-absorbing layer 3, and both edges of the whole are pressed from the surface paper side using a hot press or the like so as to be located above the overlapping portion 1'5 of the backing sheet. , crimping parts 5,5.

The water absorption power of the longitudinal center portion 3a of the water absorption layer 3 is made higher than that of its side portions 3b, 3b.

For this reason, in order to form the entire water absorbent layer 3 with water absorbent paper, it is necessary to form a wide layer 6 made of multiple sheets of water absorbent paper that has the original width of a disposable diaper.
Then, a narrow layer 7 made of multiple sheets of absorbent paper with a width narrower than this (for example, i width) is used, and the narrow layer 7 is stacked on the longitudinal center of the wide layer 6, or the wide layer 6 absorbs water. It can be placed between sheets of paper so that it is located at the center in the longitudinal direction.

In addition, the entire water absorption layer is covered with a pulverized pulp layer (usually the top and bottom surfaces are covered with thin water absorption paper).

), one or more wide layers of pulverized pulp are overlaid with one or more similar narrow layers;
Sandwich.

Of course, the wide layer 6 may be a water-absorbing paper layer (or a pulverized pulp layer), the narrow layer 7 may be a pulverized pulp layer (or a water-absorbing paper layer), and the water-absorbing layer may be made of a composite material.

According to the present invention, the central part 3a and each side part 3b, 3 on both sides thereof are
Near the boundary of b, the water absorbed in the center part is on both sides 3b,
Compressed linear dams 8, 8 are provided in the longitudinal direction from the surface paper 2 to the water absorbing layer to prevent seepage into the surface paper 3b as much as possible.

Providing the dam part 8 near the boundary between the central part 3a and both sides 3b, 3b means that the dam part 8 is formed across both the central part and both sides, and on the edges of both sides of the central offshore part or This includes the case where it is formed on each side slightly outward from both side edges of the central part.

This dam 8 can be provided by hot-pressing the water-absorbing layer from the surface paper 2 side in a longitudinal direction linearly or by pressing it without applying heat to increase the density of the water-absorbing layer linearly.

When heat is applied, the surface paper and the water-absorbing layer, and the water-absorbing paper or pulverized pulp layer of the water-absorbing layer may be lightly bonded.

Since the paper diaper of the present invention is constructed as described above, when the diaper is placed on the crotch and worn, excretion occurs in the center of the surface paper above the center of the water-absorbing layer 3a.

The moisture of the excrement absorbed in the central part 3a oozes out toward both side parts 3b, but near the boundaries on both sides of the central part, there is a linear dam compressed over almost the entire length in the longitudinal direction. Because of the presence of the parts 8 and 8, the progress of moisture is inhibited by the dam part and stagnates, and during this time water is absorbed into the not-yet-wet part of the central part 3a along the dam part 8. The amount of water that oozes across the sides 3b, 3b is reduced, thereby improving the discomfort caused by both sides getting wet and sticky.

Since only the central portion 3a of the water absorbing layer is made thicker to increase the water absorbing power, the required amount of material for forming the water absorbing layer is smaller than when the entire water absorbing layer is made thicker, and high costs can be prevented. 3b is thin, so it can be easily applied to the crotch, and the blocking parts 8, 8 prevent the narrow layer 7 made of absorbent paper or crushed pulp in the central part 3a from shifting laterally, so it can be applied to the crotch, etc. There is no risk that the narrow layer will shift laterally during handling and reduce the water absorbing power in the center.

Furthermore, the present invention induces moisture to seep into each side portion 3b, 3b.

The conductive portion 9 is formed in the same manner as the dam portion 8.

In this case, the permeation guide portion 9 is formed in the form of diagonally intersecting checkered stripes, but the intersecting direction may be vertical and horizontal, or any other arbitrary direction, and the size of the squares formed by the intersecting lattices may also be arbitrary. be.

The dam parts 8, 8 and the seepage guide parts 9, 9 may be formed in separate steps, but for example, as shown in FIG. The water-absorbing layer is hot-pressed onto the surface paper using a roll with a built-in heater and having intersecting stripes 9' on its circumference or a hot plate with a built-in heater and having the above-mentioned protrusions 8' and 9' on its flat surface. It can be formed in one step.

In addition, hot melt adhesive is applied to the entire area of the surface paper and the water absorbing layer where the damming part and the seepage guiding part are to be formed, and the above-mentioned striations 8',
The water-absorbing layer may be compressed from above the surface paper using a heating device having ridges 9', and the hot melt adhesive may be melted and bonded only in the portions compressed by the striations 8' and 9'.

In this way, since the moisture permeation guiding parts 9, 9 are provided on both sides, once the moisture has been dammed up at the dam, the moisture that attempts to permeate beyond this to each side part will flow into the permeation guiding part 9. The particles are dispersed along the entire area of each side and gradually absorbed into the aforementioned squares of the seepage guide section 9.

Therefore, by only slightly warming each side portion as a whole, it is possible to further prevent both sides of the position where excretion is performed from becoming wet and uncomfortable.

Furthermore, the paper diaper of the present invention is not limited to having both ends closed as shown in FIGS. 1 to 3, but may be constructed with both ends open.

Then, when making water-absorbing paper or surface paper, chlorophyll is mixed into the paper stock solution, chlorophyll powder is mixed into the pulverized pulp layer, or chlorophyll liquid is sprayed onto these and the paper is impregnated and dried. This allows the chlorophyll to absorb and relieve the odor of excrement.

[Brief explanation of drawings]

Fig. 1 is a plan view of an embodiment of the paper diaper according to the present invention with the surface paper partially removed, Fig. 2 is a longitudinal cross-sectional side view of the same, Fig. 3 is a partially enlarged plan view, and Fig. 4 is the heat used. A front view of a part of the press roller, FIG. 5 is an enlarged cross-sectional view of the main part, FIG. 6 is a cross-sectional view of a state in which a linear compression part is formed in the water absorption layer, and FIGS. 7 and 8 are the same as above. This is an explanatory diagram showing the state in which water is dripped onto the water absorption layer and the water soaks in. In the diagram, 1 is the back sheet, 2 is the front paper, and 3 is the back sheet.
3a is the water absorption layer, 3a is the center part, 3b and 3b are the side parts, and 8 is the dam part.

Claims (1)

[Scope of claim for utility model registration] In a paper diaper in which a water-absorbing layer made of water-absorbing paper, pulverized pulp, etc. is provided between the front paper and the waterproof backing sheet, the thickness of the water-absorbing layer at the center in the longitudinal direction is defined as the thickness of the water-absorbing layer on each side of the diaper. In addition, the surface paper and water absorption layer are pressed in a line along the boundary between the center and each side, and a compressed dam is provided in a line. A paper diaper that is made by pressing paper and a water-absorbing layer into intertwined lines to form a linearly compressed moisture permeation inducing section.