Body fluid absorbent article

Abstract

The present invention relates to absorbent articles for body fluids having improved point absorbency and diffusivity within the absorbent body, while having improved transfer characteristics of body fluids to the absorbent body, said absorbent article comprising a body fluid-permeable surface material and An absorbent body is sandwiched between the body fluid-impermeable backsheets, and the absorbent body has an upper layer and a lower layer in this order from the body fluid-permeable surface material side, and the density of the lower layer is higher than that of the upper layer.

Description

technical field [0001] The present invention relates to a bodily fluid absorbent article for absorbing and retaining bodily fluids such as sanitary napkins and paper diapers, and more specifically, to a bodily fluid absorbent article having a laminated absorbent structure, the laminated absorbent structure The body improves the point absorbency and diffusibility in the absorbent body, and at the same time improves the transfer characteristics of body fluids to the absorbent body. Background technique [0002] Conventionally, absorbent articles for body fluids having such a laminated absorbent structure have been known, for example, a two-layer structure disclosed in JP-A-2001-170111 or a three-layer structure disclosed in JP-A-8-503397. body etc. The former is provided with an upper layer that is smaller than the lower layer at the excretion contact part of the sanitary napkin to form a three-dimensional bulge, while the latter is provided with a three-layer absorbent body ...

AI Technical Summary

Problems solved by technology

[0005] In this way, embossing is applied to the absorber to make the compressed part high-density and the non-compressed part low-density. Irrelevant, so no matter how you adjust its density, you can't get a form of absorption that spreads the body fluid after quickly absorbing it

As a result, body fluids are difficult to pass through, and the high-density portion with high absorption and retention of body fluids is in contact with the surface layer that contacts the skin, so there is a problem that backflow of body fluids occurs, and the user feels sticky and uncomfortable.

In particular, if a compressed portion is provided on the surface layer side of the absorber by embossing or the like, there is a problem that transfer of bodily fluids to the absorber is insufficient.

[0006] In addition, as a measure to prevent lateral leakage of bodily fluid-absorbent articles, a known method is to perform compression processing from the surface of the absorbent structure to the bottom surface, so that both sides of the bodily fluid-absorbent article form compression lines extending in the front-back direction, thereby increasing the size of the front-to-back area. directional body fluid distribution, but since the high-density portion in contact with the skin retains a large amount of body fluid, the problems of backflow and stickiness are more obvious than those described in the Publication No. 57-205503 or 64-45801. In addition, these methods There is also a problem that the absorbent structure becomes hard, causing discomfort to the user, or causing a gap between the user's body and the user's body due to loss of cushioning properties.

[0007] As described above, spot absorbability, which is the ability to quickly absorb body fluids into the absorbent body, and diffusibility, which is the ability to diffuse body fluids throughout the absorbent body, are extremely important factors from the viewpoint of usability and leakage prevention. Absorbent articles for bodily fluids can never be said to adequately possess these capabilities

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