JPS5911002Y2 - sanitary napkin - Google Patents

Description

[Detailed description of the invention] This invention relates to a sanitary napkin that has excellent absorption and storage properties for menstrual blood, etc., can be made thinner overall, can prevent splashing and backflow of menstrual blood, and is a menstrual napkin that is soft to the touch. The purpose is to obtain a napkin, and its structure is as follows.

The sanitary napkin of the present invention has a water-absorbent layer on top of a waterproof layer, and a water-permeable layer formed from a group of hydrophobic fibers on top of the water-absorbent layer, and these laminates are covered with a water-permeable covering material. The above-mentioned water-absorbing layer is formed by sandwiching a mixture of flocculent pulp and super-absorbent polymer powder between thin, strong absorbent papers, and partially embossing this laminate to integrate it. It is characterized by its sheet-like shape.

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

1 is a waterproof layer made of waterproof paper such as polyethylene sheet or polyethylene laminated paper.

On top of this waterproof layer 1, an auxiliary water-absorbing layer 2 made of water-absorbing paper such as crepe paper or paper cotton is layered, and on top of that is a main water-absorbing layer 3.
, Next, the water-permeable layer 4 is transferred, and these laminates are made into water-permeable (
A rectangular sanitary napkin according to the present invention is constructed by wrapping the napkin horizontally with a covering material 5 having high moisture permeability and sealing both ends of the covering material 5 in the longitudinal direction.

In addition, in order to prevent the waterproof layer 1 from shifting inside,
Typically, both longitudinal ends of the layer 1 are sandwiched between the dressings 5 and sealed together.

The covering material 5 is made of a material that is highly water permeable and has good texture.

For example, polyethylene/laminate blend nonwoven fabric, rayon nonwoven fabric, rayon paper laminated with cotton nonwoven fabric, etc.
If a material based on non-woven fabric is used, it will feel especially good on the skin.

Alternatively, not only non-woven fabrics but also paper materials such as rayon paper and Japanese paper may be used.

The main water-absorbing layer 3 is made of a mixture 31 of cotton-like pulp and super-absorbent polymer powder using a thin, soft, strong water-absorbing paper 32 such as tissue paper. 3
The laminate is sandwiched between 3 layers, and the laminate is partially embossed to give a thin seed-like finish.

As shown in the figure, the embossing process is performed with approximately uniform distribution over the entire area of the layer 3.

This embossing process converts the mixture 31 into the absorbent paper 32.
It is evenly distributed over the entire surface between 33 and 33 degrees, and is reliably maintained in a constant distribution state without shifting or becoming biased.

In addition, the embossing process compresses the entire body, making it thinner and having better shape retention.

The high molecular weight polymer constituting the mixture 31 may include starch derivatives (graft copolymers such as acrylonitrile, acrylamide, acrylic acid, acrylic esters, methacrylonitrile, methacrylic esters, or partial hydrolysates thereof; (crosslinked product), crosslinked carboxymethylcellulose, polyvinyl alcohol,
Sodium polyacrylate and the like are used.

These substances have extremely high water absorption properties and have the property of swelling and becoming gel-like when absorbed, and have a much higher water absorption and retention ability than general water-absorbing paper, pulverized pulp, and the like.

An example of a material that particularly has such properties is an alkali metal salt (GSP) of a starch-polyacrylonitrile graft copolymer, and a powder of this powder and flocculent pulp that has been thoroughly dissociated using a hammer mill are used. A homogeneous mixture is obtained by feeding a predetermined weight ratio into a mixer with a stream of air and stirring.

This can be used for the mixture 31 as the main component of the main water absorption layer 3.

This mixture 31 can be used as a water-absorbing material by passing it through a distributor and forming it into a web shape, and then forming it into a sheet shape by thermocompression bonding. Water-absorbing paper 32. If the main water-absorbing layer 3 is formed by sandwiching the material between 33 and 33 and finishing the whole into a sheet-like shape, a soft and pleasant texture without stiff or dry feeling can be obtained, and the material feels very good on the skin.

In addition, the water-absorbing paper 32 has a high water absorption and retention property that the mixture 31 has.
．． The water absorption capacity of 33 is increased and an even higher water absorption capacity is developed.

On the other hand, the water permeable layer 4 is formed in the illustrated form in which the orientation of the hydrophobic fibers such as cellulose acetate, polypropylene, polyester, etc. is aligned in the longitudinal direction of the napkin, or in the form in which the orientation is not aligned (not shown). .

That is, the water-permeable layer 4 in the illustrated embodiment is formed by arranging long fiber bundles made by opening hydrophobic fiber tows into strips in parallel to the longitudinal direction of the napkin and bonding them preferably with a highly water-permeable binder. .

Alternatively, as a modification of this, short fibers of hydrophobic fibers may be arranged in the length direction to form long fibers, and the long fibers may be combined into a belt-like parallel bundle as described above, thereby obtaining the same form as shown in the figure. A permeable layer 4 is formed.

On the other hand, in the case of a configuration in which the orientation of the fiber groups is not aligned, short fiber groups of hydrophobic fibers are consolidated into a nonwoven web shape.

The water-permeable layer 4 formed from a group of hydrophobic fibers such as cellulose acetate has excellent water permeability due to the characteristics of the material, allows water to permeate through it quickly, and prevents water from rebounding and once permeated. It has the feature of preventing backflow of water.

In addition, when using a water-permeable layer that does not align the orientation of fiber groups,
When it comes in contact with moisture, it has the property of allowing it to pass straight to the opposite side without expanding.

On the other hand, the illustrated water permeable layer 4 in which the orientation of the long fiber groups is aligned
In this case, moisture is diffused in the length direction of the fibers, that is, in the longitudinal direction of the napkin, due to the capillary action of the fiber group, and the moisture is permeated while being diffused in an elliptical shape as a whole.

In addition, this water-permeable layer material exhibits sufficient rebound resilience against external pressure.

For this reason, the directionality of the fiber group is made uniform.

Regardless of whether they are aligned or not, this water-permeable layer 4 has rich cushioning properties and feels good against the skin.

In particular, among hydrophobic fibers, if cellulose acetate fibers with a single yarn weave of 8 deniers or less and a total fineness of 35,000 to 50,000 deniers are used, the compressibility will be high and the cushioning properties will be even better.

Note that cellulose acetate fibers recovered from cigarette filter plugs can also be effectively used as the hydrophobic fibers.

Alternatively, a mixture of cellulose acetate fiber and cellulose fiber may be used.

Therefore, this sanitary napkin is used with the water-permeable layer 4 facing the human body.

During this use, menstrual blood or the like excreted from the human body passes through the water-permeable layer 4 from the covering material 5 and is absorbed into the main water-absorbing layer 3.

As mentioned above, the water-permeable layer 4 has excellent water permeability and has the function of preventing water from rebounding and water that has once permeated and been absorbed into the main water-absorbing layer 3 from flowing back toward the human body. The contact surface is not sticky, so you can always feel smooth, clean, and comfortable to use.

In addition, the water-permeable layer 4 in the illustrated form in which the directions of the hydrophobic fiber groups are aligned
When using a napkin, the strong capillary action of the long fibers causes moisture to diffuse in the longitudinal direction of the napkin, making it permeate in an elliptical shape as a whole. Compared to the case where water is absorbed only in a narrow circular area, the diffusion efficiency can be greatly increased, and the overall amount of water absorbed can be greatly increased.

In addition, the soft cushioning effect of the hydrophobic fiber material provides a comfortable feel against the skin.

The main water-absorbing layer 3, which absorbs menstrual blood etc. that has passed through the water-permeable layer 4, is mainly composed of the mixture 31 of super-absorbent polymer powder and cotton-like pulp, and has an extremely high water-absorbing capacity. The ability to absorb menstrual blood, etc. increases dramatically.

In addition, when the mixture 31 absorbs moisture, it swells and becomes gel-like, so once absorbed menstrual blood, etc. remains in a liquid state and becomes saturated, like a water-absorbing layer made of general water-absorbing paper such as crepe paper or absorbent cotton. There is no risk that the covering material will eventually break and overflow.

In other words, it has excellent storage properties for absorbed menstrual blood, etc.

Moreover, even if the mixture 31 swells and becomes a gel, the water-absorbing paper 32
．． Since the main water absorbing layer 3 is held between 33 and 33 and is not dispersed, the main water absorption layer 3 maintains its sheet-like shape until the end, and therefore does not lose its shape until the napkin as a whole is used.

Further, since moisture can be spread throughout the mixture 31 through the water-absorbing papers 32 and 33, the absorbing and storing ability of the layer 3 can be maximized.

As described above, when using this napkin, the main water absorption layer 3 has excellent water absorption and storage ability, so that even if the layer 3 is formed into a fairly thin sheet shape as shown in the figure, sufficient effects can be achieved.

The auxiliary water-absorbing layer 2 layered on the lower surface of the main water-absorbing layer 3 serves as a safety valve in cases where the amount of excreted menstrual blood or the like is abnormally large.

That is, during normal use, the absorption and storage of menstrual blood, etc. is sufficiently covered only by the main water absorption layer 3, and the auxiliary water absorption layer 2
Very little, if any, menstrual blood is absorbed by the body.

Therefore, it is not necessary to use the auxiliary water-absorbing layer 2, and even if it is used, one sheet of water-absorbing paper such as crepe paper is sufficient.

Therefore, the thickness of the entire water absorbing layer can be made much thinner than that of conventional products.

As explained above, the sanitary napkin of the present invention quickly absorbs menstrual blood and does not return it to the human body, so it is not sticky, provides a clean and comfortable usage condition, and has the ability to absorb and store menstrual blood, etc. It is possible to significantly improve the skin's texture, and also to obtain a soft texture and cushioning properties.

In addition, since the entire product can be made thin based on the increased absorption and storage capacity, it has a better feel during use and is advantageous in terms of handling such as packaging and transportation.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, with Figure 1 being an exploded perspective view and Figure 2 being an exploded perspective view.
The figure is a perspective view of the product appearance, and Figure 3 is Figure 2 III-II.
FIG. 3 is an enlarged cross-sectional view taken along line I. 1... Waterproof layer, 3... Main water absorption layer, 31
...Mixture forming the same layer, 32. 33...
...Water-absorbing paper, 4...Water-permeable layer, 5...
...Covering material.

Claims (1)

[Scope of utility model registration request] A water-absorbing layer is placed on top of the waterproof layer, and a water-permeable layer formed from a group of hydrophobic fibers is layered on top of the water-absorbing layer, and these laminates are covered with a water-permeable covering material. A mixture of pulp and superabsorbent polymer powder is sandwiched between thin and strong water-absorbing papers, and this laminate is partially embossed to form an integrated sheet. A sanitary napkin characterized by: