JPS6227952A - Absorbing body of tampon - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to feminine sanitary products, and specifically relates to an improvement in the absorbent body of a sanitary tampon that is inserted into the vagina to absorb and process menstrual blood.

[Conventional technology and problems]

Many proposals have been made regarding sanitary tampons. For example, as shown in FIG. 9, the water-absorbing fiber laminate 9 is cut into a rectangular shape, a take-out string 10 is sewn to the center of the cut, and then compression molded, or a suitable material as shown in FIG. Two pieces of rectangular absorbent fiber laminates 9'' of a certain size are laminated in a cross shape, a string 10 is attached to the center part 11, the part is made to protrude as the rear end, and the product is compression molded. be.

However, these tampons generally have a
Because a fiber laminate with a large basis weight of 1000g/rd is used, the fibers often become intertwined with each other, that is, the fiber laminate is not cohesive, and when taking out the tampon after use, it absorbs menstrual blood. However, there is a drawback that fibers or fiber clusters of the tampon fall off due to contact and frictional resistance between the swollen tampon and the vaginal wall.

Furthermore, since the fiber laminate does not have sufficient strength, the fiber laminate tends to stretch or break during tampon processing, and is not sufficiently suitable for high-speed production of tampons.

In order to improve the strength of the fiber laminate or the intertwining of the fibers, a method of combining fiber laminates by needling is disclosed in JP-A-49-59498, JP-A-55-35699, etc. . but,
This method improves the intertwining of fibers, but since needling is performed using metal needles, the fibers are damaged and short fibers are produced in some places, so it is not sufficiently effective in reducing fiber shedding. Needle breakage may occur during needling, which is then molded into a tampon, which is extremely dangerous as a menstrual treatment product that is inserted into the vagina, and is unsuitable as a method for integrating fiber laminates. I have to say.

In addition, there is a proposal in Japanese Utility Model Publication No. 59-25376 that focuses on how to join the retrieval string, but this idea does not improve the intertwining of fibers in any way, especially fine fibers (fiber waste) and short fibers. This was insufficient in terms of shedding of fibers (fibers with a fiber length of 10 mm or less).

The aforementioned disadvantage of slow absorption rate for highly viscous liquids such as menstrual blood is a common problem with conventional tampons. This is because the oil (finishing agent) adhering to the water-absorbent fibers that make up the absorbent body of tampons and impurities during fiber manufacturing have the property of interfering with the absorption of menstrual blood. The absorbent material of tampons is generally made of water-absorbing fibers such as rayon, but these fibers are coated with oil to make them soft, smooth, and smooth during spinning, knitting, dyeing, and other processes. However, the requirements such as elasticity, appropriate frictional properties, and antistatic properties are not met. However, the present inventors have found that the absorption rate is generally faster when a tampon is formed using a fiber laminate that has been washed with water to reduce the amount of oil and impurities attached. In order to do this, it is necessary for the fibers to be coated with oil,
The absorption rate of conventional tampons was slow due to these oils and other substances attached to them."

As mentioned above, conventional sanitary tampons have the following drawbacks.

(11 The strength of the fiber laminate is not sufficient.

(2) A large amount of fibers fall off when taking out the tampon after use.

(3) The absorption rate is slow for highly viscous liquids such as menstrual blood.

[Means for solving problems]

The present inventors have completed the present invention as a result of intensive research to solve the above-mentioned problems.

That is, the present invention provides a tampon absorbent body in which a sheet-like material in which fibers are entangled is formed by injecting a liquid to a fiber laminate mainly composed of water-absorbing fibers, and the sheet-like material is compression-molded. To provide a tampon absorbent body, characterized in that the jetting pressure of the liquid is 30 kg/cJ or more, and the area of the part of the fiber laminate to which the liquid is jetted is 3 to 15% of the total area. be.

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

In the present invention, the fibrous web mainly composed of water-absorbing fibers is formed using a spinning card, garnet, or other equipment. This fiber web is laminated as it is or by an appropriate method to obtain a fiber laminate. There are two methods for laminating fibers: one in which the fibers are arranged almost parallel to the length of the web (parallel-laid), and one in which the fibers are folded and arranged in a cross-laid manner (cross-laid). Fiber laminate 1 as shown in Figure 1
form. Further, a fiber laminate can also be obtained by a method such as air-lay, in which the fibers are arranged randomly and have no directionality.

The fiber laminate 1 thus obtained is conveyed by a belt 4 to a liquid jetting step. In the liquid injection process, nozzles are placed at suitable intervals on the fiber laminate 1, as shown by arrow 2, so that the area of the portion of the fiber laminate to which the liquid is injected is 3 to 15% of the total area. Spray liquid from 3 (
Figure 1). The liquid is generally water, but heated water such as hot water or hot water may be more effective for the purpose of the present invention, which is to wash away oils and other impurities adhering to the fibers. be.

After the liquid is injected in this manner, it is dried in the drying device 12 to form a fiber sheet-like material 5 in which the fibers are entangled.

In the present invention, the degree of entanglement of the fibers that make up the fiber laminate is important, and it is also important to wash off the oil adhering to the fibers, and the key to this purpose is the jetting pressure of the liquid. That's the point. That is, in order to improve the entanglement of fibers and produce a fiber sheet with good processability and PI,
The injection pressure of the liquid must be 30 kg/cm or more; if the pressure is lower than this, entanglement will not be sufficient, the strength will be insufficient, and the cleaning effect of oil agents etc. will not be great.

Further, nozzles with high injection pressure, such as the nozzles, are generally set at intervals of 2 mm x 110 mm or less. If this distance is too small, a fiber sheet with high strength will be obtained and the processability of the tampon will be improved, but the thickness will be too small and when used in a tampon absorbent, the fiber reaction force when wet will be The amount of absorption will decrease. Also, 3
If the distance between all nozzles that eject liquid of 0 kg/ctM or more is 10 mm or more, the absorption value will be satisfied, but the strength of the fiber sheet will be weakened, and the processing suitability, especially for tampons at high speeds, will be reduced. When producing a fiber sheet, the processing suitability when supplying a fibrous sheet material tends to decrease.

An example of the fiber sheet-like material 5 obtained as described in 1- below is shown in FIGS. 2 and 3. In these figures, 6 is a thin part to which high-pressure liquid is directly injected, and 7 is a thick part to which high-pressure liquid is not directly injected.

When high-pressure liquid is injected onto the fiber laminate from a thin nozzle, the fibers become entangled in the areas where the liquid is directly injected.
The thickness is thinner than the parts that are not directly injected with liquid.

In addition, generally the fiber direction is aligned (parallel-
1aid) In the case of a fiber laminate, a sheet-like product in which the fibers do not fall off easily can be obtained by advancing the fiber laminate in a direction approximately perpendicular to the fiber direction and injecting high-pressure liquid.

After careful consideration of the manufacturing conditions and processing suitability of such a fiber sheet and its absorption properties as a tampon, we found that thin parts of the fiber sheet were directly injected with liquid at a pressure of 30 kg/cal or more. The area of was important. If the area ratio of this part increases, the processing suitability will be good (but the amount of absorption will decrease), and if the area ratio becomes smaller, the processing suitability will be poor, and the amount of sloughed substances will decrease when the area ratio is small. will also increase.Specifically, 30 kg/c
The area of the thin portion to which the liquid with a pressure of J or higher was directly injected was suitably 3 to 15% of the area of the entire sheet-like material. Therefore, if high-pressure liquid is repeatedly injected onto the same fiber laminate and the area ratio of the area injected with the high-pressure liquid increases to 15% or more, the sheet-like material will become thinner as a whole. There was a tendency for the amount of absorption to decrease.

Here, the area ratio of the high pressure liquid injection part is (30 kg/-
Nozzle diameter at a pressure of 30 kg/cIA or more
one side) X100 (χ). Further, the nozzle diameter was suitably 0.4 mm or less.

Naturally, the high-pressure liquid injection portions 6 do not necessarily have to be formed continuously in a cotton-like manner, as shown in FIGS. 2 and 3, and are equally spaced in the machine flow direction. They do not need to be exactly the same, and may even intersect, for example, as shown in FIGS. 4, 5, and 6.

Therefore, if the number of nozzles that inject liquid at an injection pressure of 30 kg/cJ or more is small, even if the liquid is injected several times to the same fiber laminate, the sheet as in the example given here will not be produced. can form a shape. Alternatively, the high-pressure liquid may be injected not only from one side of the fiber laminate but also from both sides to form a high-pressure liquid injection part. For example, the nozzle 3 may be set as shown in the sectional view in FIG. 7+a), fbl. Even when high-pressure liquid is injected from both sides of the fiber laminate 1, the ratio of the total area of the parts directly injected with the liquid to the area of the sheet-like material (one side) is considered.

In addition, in the method of manufacturing a fiber sheet-like material as shown in FIG. 1, from the side opposite to the nozzle 3 in FIG.
When the liquid is injected at a pressure of about cId, the fiber sheet becomes less fluffy and easier to handle, and the number of falling substances is further reduced. In such a case, the area ratio of the portion onto which the liquid is injected at a relatively low pressure of 5 to 20 kg/cJ to the entire sheet-like material is not particularly limited.

In the present invention, the type of water-absorbing fibers constituting the fiber laminate may be of any type that is generally used in tampons.
Examples include rayon, absorbent cotton, or mixtures thereof. Further, a small amount of hydrophobic fiber may be mixed. There is no particular restriction on the fiber diameter, but since it is used in tampons, a diameter of about 1 to 5 denier is appropriate from the viewpoint of water absorption performance. Regarding the fiber length, a fiber length of 20 mm or more is suitable, and a fiber length of 30 mm or more is more suitable for the purpose of the present invention to reduce the number of fallen fibers.

Furthermore, in order to obtain a sheet of fibers to be compression molded into the absorbent body of the tampon of the present invention, a nonwoven fabric mainly composed of water-absorbing fibers is used as a base fabric, and a fibrous laminate is superimposed on the base fabric, or a laminate of fibers is stacked on the base fabric. There is also a method of sandwiching a fiber laminate between cloths and spraying a liquid in the same manner as shown in FIG. 1. The sheet-like product thus obtained has the advantage of increased strength and ease of handling since it contains a nonwoven fabric.

The tampon absorbent body of the present invention is characterized by the use of a fiber sheet in which fibers are entangled by spraying a liquid, so that the tampon absorbent body of the present invention is loaded into a so-called applicator. are also included in the present invention.

[Examples] In order to explain the present invention more specifically, detailed examples will be described below.

Examples 1 to 4 and Comparative Examples 1 to 6 Fiber sheet materials as shown in Table 1 were prepared under the conditions shown below, and various properties were compared.

The amount of absorption, rate of absorption, and shedding of substances are as follows for tampons obtained by compression molding these fiber sheet-like materials using the method shown in Figure 10, with the side on which the high-pressure liquid is sprayed facing the outside of the tampon. It was measured by The results are shown in Table 1.

1 Ugly Toni'' - 1 piece 4 Naguig 1 Guichitsuji I Komakogyu - (1) Fiber used: Rayon 3 denier 51+vn (manufactured by Daiwabo @, product name Corona) (2) Manufacturing method of fiber laminate: 20g/ % web by card, which is 13
The layers are stacked to form a 260 g/rd fiber laminate.

(3) Liquid injection conditions: Fiber laminate with ion-exchanged water at 30℃ fibers perpendicular to the fiber direction of Advance the laminate and spray.

The distance between the nozzle and the fiber laminate was approximately 26 mm, and the advancing speed of the fiber laminate was 2 m/fiber separation.
Things and no Z's! - Size of the 11-fiber sheet: length 96 mm, width 50 mm (2) Size of tampon: length 50 mm, diameter 12.5 mm φ (3) Weight of tampon 72.5 g Item q - Shell ■ Masusada 1 Hiro ■ Thickness: After stacking 10 fiber sheets, the thickness was measured by applying a load of Ig/cJ, and the thickness per frame of the fiber sheet was calculated.

■Strength and elongation when loaded with 100g: Length II' = 150mm, width - as shown in Figure 8
A 50 mm fiber sheet specimen was subjected to a tensile test using a tensile tester, and the strength and elongation at a load of 100 g (
%) was measured.

Note that 8 indicates the fiber direction in the fiber sheet-like material. Materials with a strength of 20 kg or more and an elongation of 5% or less when loaded with 100 g had good processing suitability.

■Amount of absorption: Place a tampon in an elastic rubber tube with an inner diameter of 10 mm with the tip facing up, and gradually inject horse defibrinated blood [viscosity 2°cps (25°C)] from above. The injection was stopped when leakage occurred from the lower end of the tampon, and the weight of horse defibrinated blood absorbed into the tampon was measured, and the amount was determined as the absorbed amount.

(2) Absorption rate: In the same manner as (2), 5 g of horse defibrinated blood was injected at once and the time until the horse defibrinated blood was completely absorbed was measured.

■Falling material: August 10, 1970, Ministry of Health and Welfare 4L Notification No. 303, 1972
Complies with the standards for menstrual treatment tampons as revised by the Ministry of Health and Welfare Notification No. 251 dated September 21, 2009.

The standard value is 25 mg or less.

As is clear from the results in Table 1, the tampons of the present invention are excellent in processability, absorption properties, and shedding materials.

〔Effect of the invention〕

In the tampon absorbent body of the present invention, the fibers of the sheet-like material constituting the absorbent body are strongly entangled, and the proportion of short fibers contained is small, so that it is possible to absorb menstrual blood and take out the swollen tampon during or after use. During this process, fibers and fiber lumps are less likely to fall off. Furthermore, since the amount of oil agent 411 deposited is small, the absorption rate is fast and the amount absorbed is large even for highly viscous liquids such as menstrual blood. Furthermore, since the fiber sheet material has high strength, it is suitable for high-speed production of tampons.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing the manufacturing process of a fiber sheet used in the tampon absorbent body of the present invention, and FIGS. 2 to 6 are a rectangular fiber sheet according to the present invention. A perspective view showing an example, FIG. 7 is a diagram showing a method of injecting high-pressure liquid onto both sides of a fiber laminate, FIG. 8 is a diagram showing the shape of a test piece for tensile testing, and FIGS. 9 and 10 are Fig. 1 is a perspective view showing the state of a tampon when it is formed into cotton. High-pressure liquid injection part) 7: Thick part 8: Fiber direction in fiber sheet material 9.9': Rectangular fiber laminate 10: String 11: Center part 12: Drying device

Claims (1)

[Claims] 1. In a tampon absorbent body made by forming a sheet-like material in which the fibers are entangled by injecting a liquid onto a fiber laminate mainly composed of water-absorbing fibers, and compression molding the sheet-like material, the liquid is injected into the absorbent body of a tampon. The pressure is 30 kg/cm^2 or more,
The area of the part of the fiber laminate where the liquid was sprayed is 3 of the total area.
15%.