JPS60198151A - Exterior material of sanitary article and its production - 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 The present invention relates to an exterior material for sanitary articles such as sanitary napkins and disposable diapers, and a method for manufacturing the same.

This type of exterior material has a smooth surface that feels good to the touch, moderate bulk, and soft elasticity in the thickness direction (cushiness).
Although it is desirable to have good permeability to body fluids even under humid conditions, it is desirable to have low exudability, and conventionally, such desirable b
A π exterior material and its manufacturing method were proposed with the intention of satisfying the above conditions.

And it will be implemented. The exterior material according to this known technique is formed of a non-woven fabric in which the upper layer and the lower layer are integrated, and the upper layer is made of fine denier hydrophobic fibers.
The main layer is made of thick denier hydrophilic fibers.
The M mixture is bonded by heat amalgamation (welding), the upper layer is made of fine denier hydrophobic fibers, and the lower layer is made of thick denier hydrophobic fibers. Some binders bind mm' through heat treatment. but,
According to known techniques, fibers? Since binder tiles are bonded and formed into a non-woven fabric by heat roll treatment, it is difficult to obtain satisfactory texture, cushioning properties, and permeability to body fluids. The object is to provide a sheathing material and a method for manufacturing the same which can overcome the drawbacks of the prior art as described above.

That is, 1. The gist of the present invention is to impart water absorbency to the upper layer mainly composed of first hydrophobic f@ fibers of 0.8 to 3 deniers and 8 to 20% 2, and to the fiber surface of 25 to 75v2. and a lower layer mainly composed of tuna 2 hydrophobic fibers and in which 10 or more of the second hydrophobic fibers are of 3 to 12 deniers are integrated by the parent structure of the cell fibers, and the above-mentioned The present invention relates to an exterior material for a sanitary article, which is formed into a non-woven fabric by mixing the first hydrophobic fibers and the second hydrophobic fibers at an intermediate node where the upper and lower layers meet, and a method for manufacturing the same.

The present invention will be further explained based on embodiments as follows.

As shown in FIG. 1, the material to be treated used in the implementation of the present invention is a first
Hydrophobic fiber 2a; Q > No. 2, 25-75 yen
m-〇 Water absorbency is imparted to the surface of the pine fiber, and t″L is composed of second hydrophobic fibers 3a and 10 Jl of the second hydrophobic fibers.
It is laminated with a lower layer web 3 having a denier of 3 to 12 deniers. This material to be treated L is introduced onto a support, placed so as to face the upper surface of the support, and is injected with a high water flow from a π orifice all over the material to be treated to perform this Lk entanglement treatment. It is formed into a non-woven fabric.

If all fibers of 3 denier or more are used in the upper layer 2, it will be completely t-10.
If it is used in excess of ii%, the permeability of body fluids in the finished exterior material will be poor (as well as the fibers in the lower layer 3 are likely to come into contact with each other, causing a capillary phenomenon). 7) The overall rigidity is reduced, and it does not have an appropriate bulk, and it is easy for bodily fluids to leak out.

If the 111Fa of the soil layer 2 is 8 ter or less, the texture of the finished exterior material will be poor (similar to the above).
g is 42 or more, and if the number of fibers in the lower layer 3 is 562 or less, the body fluid permeability of the finished exterior material will be poor.

If the fibers in the lower layer 3 are 75 Vm'' or higher, the fine denier fibers in the upper layer 2 will immerse into the thicker denier fibers in the lower layer 3 in the finished exterior material, making it ineffective to arrange fine denier fibers in the upper layer 2. There is no.As for the finished exterior material, lower J-,
100 weights of 3-12 denier fibers:
However, if the amount of the fiber is 10M or less,
Compared to the upper layer 2, the lower layer 3 has a thicker denier and is not effective. On the other hand, if the material to be treated contains at least 10M of fibers of 13 denier or less, This is between thick fibers of 3 denier or more! ! , the function of interlocking is fully fulfilled, and the interlocking process becomes stable.

Examples of the round aqueous fibers that are used in the present invention and which impart water absorbency to the fiber surface include polyester fibers and acrylic fibers, and ζn and others are used in the textile industry.

It is known as a hydrophobic fiber because of its ability to absorb sweat and water.

Therefore, in the practice of the present invention, it is preferable that the fibers of Koko et al. have a flocculent pulp sedimentation rate f of 10 seconds or less according to the sanitary product standards (Ministry of Health and Welfare Notification No. 285) in the test. .

The support and the treatment steps are not particularly limited.

The inventors have filed Japanese Patent Application Nos. 55-114151 and 57-2.
A preferable example is the method for producing a non-wear fabric disclosed in No. 33998. In these methods, 5! , nine days later,
The entanglement process is carried out in multiple stages in the full-scale treatment process.For details, please refer to the explanation of Soku et al.'s method.
A brief description of the support in their method is as follows:
The support used in the pretreatment process is a wide non-porous belt hung between rotating rolls, or a wide porous belt with several tiles hung at a predetermined interval between the rotating rolls. The support surface is placed in contact with a narrow non-porous support on the lower surface of the mesh screen (mesh screen), and the support in the full-scale treatment process is composed of a plurality of non-porous rolls arranged at predetermined intervals. Zakuru. According to this process, even if the material to be treated has a low basis weight, the web can be entangled to such an extent that the texture of the web is not disturbed during the process of moving through the full-scale entangling process in the pre-treatment process. , n are further subjected to full-scale entangling treatment in the full-scale processing step.

As shown in FIGS. 2 and 3, the N71 exterior material 11 obtained by the above-mentioned treatment includes an upper layer mainly consisting of the first hydrophobic fibers 2a k and the second hydrophobic fibers a3a.
The second hydrophobic fibers are mainly composed of K, and 10% by weight or more of the second hydrophobic fibers are of a denier of 3 to 12. 3 to the middle class 40 which is in contact with the lower class (capital)? Then, the first hydrophobic fiber 2a and the second hydrophobic fiber 3a are mixed to form a non-woven fabric.

In the above, the meaning of ``main body'' is because the material to be treated is not entangled with the high-speed water flow as described above, and therefore, as shown in FIGS. 2 and 3, the upper layer is added A part of the M2 hydrophobic fibers 3a in the lower layer and a part of the first hydrophobic fibers 2a in the lower layer are mixed,
Said first and second hydrophobic 11ijl! M2a, 3
This is because a is clearly divided into upper and lower ribs at 30 points.

According to the present invention, it is possible to obtain an exterior material that fully satisfies the desirable conditions described above, particularly in terms of texture, cushioning properties, and permeability to body fluids. Such performance can only be obtained by entangling the treated material having the π4Iiii+leg configuration as described above with a high-speed water stream. This cannot be obtained depending on the method of bonding the fibers by heat welding.Incidentally, the treatment using the needle punch method is suitable for the low basis weight exterior material (nonwoven fabric) targeted by the present invention. do not have.

fruit#! Example 1 This example clearly shows that the denier of the fibers constituting the main body of the upper and lower layers is important in the present invention. An upper layer web of 15 g42 of polyester fibers was transferred to a lower layer web consisting of 10.5 g4" of π polyester fibers, and an entangling treatment was performed at a jetting pressure of 30 yen cm2 to obtain 1 product. 9 results. Shown in 1.

Table 1 Example 2 In the present invention, the lower layer imparts water absorbency, and by mainly comprising 7C hydrophobic fibers, body fluid permeability in the lower layer is improved. As shown above, 1.4dX44mm polyester fiber 2
0% Zk and 20 g/2 of 5d x 51 min polyester fibers were arranged in the lower layer to obtain a working product t''.Water absorption was imparted, and the degree of 9 was measured by the sedimentation rate K. (according to product standards).

The results are shown in Table 2.

Table 2 Permeability test method Seed water at a temperature of 7°C is dropped on the surface of a filter paper, tissue, and non-woven fabric in this order.
c Indicates heavy industry. Note that materials with good permeability permeate with a small load.

Example 3 In this implementation, the difference in gender H8 was determined by the basis weight of the fibers that constitute the main body of each of the upper and lower layers. As shown, the upper layer is 1.4 (1X44
A mixture of polyester fibers of 1.5 mm x 51 mm and polypropylene fibers of 1.5 d
A product made with 8-inch polyester fibers that are fully absorbent on the surface of mm. Toku tile. The results are shown in Table 3.

Table 3 Example 4 This example shows the difference in performance depending on the total water absorbency, f'L, and the mixing ratio of the hydrophobic fibers.
mm -10%2 polyester fiber and 1.5dX
Mixed with 51nm/10%z polypropylene fiber, giving water absorption of 6d x 51mm to the lower Jim, and polyester fiber and 6+L x 51 xnm to T'L.
Combined with regular polyester fiber 1! t m g,,;
The mixture of the two works well for the product. The #N button is shown in Table 4.

Table 4

[Brief explanation of drawings]

FIG. 1 shows the invasion of the material to be treated in the method of the present invention more clearly using diagonal lines. l...material to be treated 211. Upper layer 2a...first hydrophobic filament 351. Lower no blade...F increase 40.0. Kouma Shield

Claims (1)

[Claims] (1) 0.8-3 denier, 8-20%2 first hydrophobic fiber? Water absorbency is imparted to the fiber surface of 2!5 to 7 to 2, which mainly consists of the second hydrophobic fiber, and 10 to 10 of the second hydrophobic fiber. The first hydrophobic fibers and the second hydrophobic fibers are integrated by intertwining the fibers, and the first hydrophobic fibers and the second hydrophobic fibers are in contact with the upper and lower layers. An exterior packaging material for sanitary articles, characterized in that it is formed into a nonwoven fabric by mixing. (2) The exterior material for sanitary articles according to claim 1, wherein a part of the second hydrophobic fibers mentioned below are mixed with the first hydrophobic fibers mentioned above. (8) The second hydrophobic castle fiber of the lower layer has the first hydrophobic castle fiber of the upper layer.
Claim 1 in which some of the hydrophobic fibers are mixed
Exterior materials for sanitary articles listed in Section 1. (4) The exterior material for a sanitary article according to claim 1, wherein the second fast-watering fiber of the lower layer has a sedimentation speed of 10 seconds or less. (5) An upper layer web consisting of 0.8 to 3 denier, 8 to 20 g/2 hydrophobic fibers, and 99 JI2 hydrophobic fibers with water absorbency imparted to the fiber surface of 25 to 75 denier. At the same time, 10 or more of the second hydrophobic fibers are 3
~12 tenier, and formed into a cine woven fabric form by treating the laminated web with a high velocity water stream on a gold support to entangle the fibers of the web. A method for manufacturing an exterior material for a sanitary article.