JPH0288058A - Surface material for sanitary good - Google Patents

Abstract

PURPOSE:To provide the surface material of a sanitary good which is difficult to break and has an excellent touch by a method wherein span bond nonwoven cloth is laminated on both surfaces of melt blow non-woven cloth, and further a pore is formed in a bonded region. CONSTITUTION:The surface material of a sanitary good is formed by a three- layer laminate of span bond non-woven cloth 1, a melt blow non-woven cloth 2, and a span bond top non-woven cloth 3. Bonded regions 4 having an arbitrary pattern is formed on the three-layer laminate. The bonded region 4 is a region in which the constituting fibers of each of the span bond non-woven cloth 1, the melt blow non-woven cloth 2, and the span bond top non-woven cloth 3 are softened or molten and cured in an integrally formed state. A pore 5 is formed in a part of the bonded region 4, and the diameter of the pore 5 is preferably approximate 0.01-1mm. In formation of the pore 5 in the bonded region 4, the heating temperature of a protrusion is increased or a press force is increased, and a film formed in the bonded region 4 may be molten. The tip of the protrusion is pointed and a film formed in the bonded region 4 may be pierced.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a surface material for sanitary products such as sanitary belts for women and disposable diapers used for urination and defecation of infants or sick people, which has particularly high strength, has a smooth texture, and is permeable to urine etc. The present invention relates to surface materials for sanitary products with good properties.

[Conventional technology]

In recent years, spunbond nonwoven fabrics and melt-blown nonwoven fabrics have been used as surface materials for sanitary products such as disposable diapers. An example of using a spunbond non-woven fabric is described in Japanese Utility Model Publication No. 59-9620, and an example of using a melt-blown non-woven fabric is described in JP-A-62
It is described in the publication No.-299501. Spunbond nonwoven fabric is obtained by directly accumulating continuous fibers that are spun from a polymer stock solution and then drawn. Methods for producing spunbond paper cloth are well known and are described, for example, in Japanese Patent Publication No. 37-4993, Japanese Patent Publication No. 49-30861, and the like. The continuous fibers that make up the spunbond nonwoven fabric are stretched, and the polymer chains are oriented and have a high degree of crystallinity, so they exhibit high strength. Therefore, the spunbond nonwoven fabric itself has the advantage of being high in strength. Taking advantage of this advantage, it is used as a surface material for sanitary products, but on the other hand, it has the disadvantage of being unpleasant to the touch. This is because it is difficult to obtain ultrafine fibers in the production of spunbond nonwoven fabrics, and the surface cannot be finished smoothly. On the other hand, melt-blown nonwoven fabric is made by blowing a polymer stock solution through pores with high-speed gas (eg, heated air) and collecting the resulting ultrafine fibers. Methods for producing melt-blown nonwoven fabrics are also known and are described, for example, in Japanese Patent Publications No. 56-33511 and Japanese Patent Publication No. 62-2062. The fibers constituting the melt-blown nonwoven fabric have a fiber diameter that is very small for boat fishing. Therefore, the surface of the melt-blown nonwoven fabric has the advantage of being excellent in smoothness and having a good texture. However, the ultrafine fibers constituting the null l-blown nonwoven fabric are not sufficiently drawn during manufacture and have low strength, and therefore the melt blown nonwoven fabric itself has a disadvantage of having low strength. When spunbond nonwoven fabric is used as a surface material for sanitary products, it has the disadvantage of being uncomfortable to the touch, and when spunbond nonwoven fabric is used as a surface material for sanitary products, it has the disadvantage of low strength. There it was.

[Issue 8 to be solved by the invention] In order to eliminate these drawbacks, it is thought that a surface material with good texture and high strength can be obtained by laminating a spunbond nonwoven fabric and a Nol 1 to blown nonwoven fabric. (For example, see Japanese Patent Publication No. 60-11148). However, when a melt-blown nonwoven fabric and a spunbond nonwoven fabric are bonded together using an adhesive, the resulting surface material is hardened as a whole due to the presence of the adhesive, resulting in a decrease in texture and poor texture. there were. It is also possible to obtain a surface material by softening or melting either the melt-blown nonwoven fabric or the spunbond nonwoven fabric and bonding them together under heat over the entire surface. There were cases where the skin quality decreased and the texture deteriorated. Furthermore, since the melt-blown nonwoven fabric is made up of an accumulation of ultrafine fibers, the fiber gaps are very small, and although it feels good to the touch, it has the disadvantage that it is difficult for urine etc. to pass through it. Therefore, the present inventors applied partial thermocompression bonding to a laminate of a spunbond nonwoven fabric and a meltblown nonwoven fabric, formed a bonding area in an arbitrary pattern, and laminated and bonded both nonwoven fabrics. We have developed a surface material for sanitary products that has pores that allow water to pass through. When used as a surface material for sanitary products with the Norl-Blo surface pressure woven fabric side of the laminate in contact with the skin, it has a good texture, high strength, and feels good on the skin.
In addition, it has excellent permeability to urine, etc. However, when used as a surface material, the ultrafine fibers in the melt-blown nonwoven fabric sometimes fluff or fly apart, resulting in the fine fibers adhering to the skin. Furthermore, in the case of an aggregate of ultrafine fibers, since the surface area per unit area is large, the area in contact with the skin is also large. Therefore, it sometimes gives a slimy feeling to the skin. There are individual differences in this slimy sensation, but some people find it unpleasant. Therefore, the present invention has been developed by laminating a two-layer laminate of a spunbond nonwoven fabric and a meltblown nonwoven fabric, and further laminating a spunbond nonwoven fabric on the surface of the meltblown nonwoven fabric by a certain method, so that the laminate of the spunbond nonwoven fabric and the meltblown nonwoven fabric has The advantage is that the melt-blown nonwoven fabric is maintained as it is, and the fuzziness and sliminess of the melt-blown nonwoven fabric are prevented. [Means and effects for solving the problems] The present invention is a three-layer laminate in which two spunbond nonwoven fabrics are disposed on both sides of a meltblown nonwoven fabric, the two spunbond nonwoven fabrics and the The melt-blown nonwoven fabric relates to a surface material for sanitary products that is bonded by a bonding area of an arbitrary pattern, and the bonding area is provided with pores. The surface material of the sanitary product according to the present invention is composed of a three-layer laminate of a spunbond nonwoven fabric (1), a meltblown nonwoven fabric (2), and a spunbond nonwoven fabric (3), as shown in the drawings. In the present invention, the spunbond nonwoven fabric (3) on the side that comes into contact with the skin is referred to as a spunbond top nonwoven fabric, and the spunbond nonwoven fabric (1) on the side that comes in contact with a urine absorber or the like is referred to as a spunbond top nonwoven fabric. As the continuous fibers constituting the spunbond nonwoven fabrics (1) and (3), polyolefin fibers, polyester fibers, polyamide fibers, etc. are used. Further, the ultrafine fibers constituting the melt-blown nonwoven fabric (2) include polyolefin fibers and polyester fibers. Polyamide fibers and the like are used. Note that it is preferable to use a fiber diameter (denier) of the continuous fibers constituting the spunbond top nonwoven fabric (3) that is smaller than the fiber diameter of the continuous fibers constituting the spunbond base nonwoven fabric (1). Since the surface of the spunbond top nonwoven fabric (3) is the surface that comes into contact with the skin, it is preferable that the fiber diameter be smaller in terms of texture. An arbitrary pattern of bonding regions (3) is formed in this three-layer laminate. This bonding region (3) is a region in which the constituent fibers of the spunbond base nonwoven fabric (1), the melt-blown nonwoven fabric (2), and the spunbond top nonwoven fabric (3) are softened or melted and solidified in an integrated state. Say the area. In other words, it refers to a region in which each of the constituent fibers has partially or almost lost its form and is substantially formed into a film. The arrangement of the bonding region (3) can be determined arbitrarily, and therefore the bonding region (3) can be formed with any button. However, it is preferable that the bonding regions (3) are scattered as uniformly over the entire pattern as possible. If the pattern is non-uniform, the overall texture tends to deteriorate. Furthermore, the area, shape and proportion of the bonding region (3) can be arbitrarily determined. However, in particular, the area is 0°007～
A value of about 7 is preferable. Area is 0. ．． 0. (If it is less than 17Ird, the bonding area (4) is too small and each nonwoven fabric (1
). (2), (3), the number of joints decreases, and the joint strength tends to decrease. Moreover, if it exceeds 7 mn1, the bonding area (4) becomes too large and the overall feel tends to deteriorate. Moreover, the shape is preferably circular or square. If the shape is linear, the overall texture tends to deteriorate. Furthermore, the proportion of the bonding region (4) is preferably about 5 to 35%. If the ratio of the bonding area (4) is less than 5%, the number of bonded parts of each nonwoven fabric (1), (2), and (3) will decrease, and the bonding strength will tend to decrease. On the other hand, if it exceeds 35%, there will be too many joints and the overall texture will tend to deteriorate.To form the joint area (4), for example, spunbond nonwoven fabrics (1) and (3) and melt-blown What is necessary is to press the protrusions heated to a temperature equal to or higher than the softening point of the constituent fibers of the nonwoven fabric (2) onto the laminate.Therefore, the spunbond nonwoven fabric (1)
The constituent fibers of (3) and the constituent fibers of the melt-blown nonwoven fabric (2) are preferably of the same type. This is because they soften or melt at approximately the same temperature, resulting in a uniformly solidified bonding region (4). The three-layer laminate may be pressed by passing it between a smooth roll and a heated embossing roll or between an embossing roll and an embossing roll, for example. The spunbond base nonwoven fabric ( ), the memelt-blown nonwoven fabric 2), and the spunbond top nonwoven fabric (3) are firmly bonded by this bonding region (4). The binding area (4) is provided with pores (5). This pore (5) is provided in a part of the bonding region (4),
The diameter of the pores (5) is preferably about 0.01 to 1 mm. If the size of the pores (5) is less than 0.01 mm, the permeability of urine and the like tends to be inhibited. Also, 1 n
If it exceeds +m, the permeability of urine etc. becomes excessively large, and the urine etc. absorbed inside 7B tends to flow back through the surface material. In order to make this pore (5) in the bonding area (4), the heating temperature of the protrusion is increased or the pressing force is increased.
) may be melted. Alternatively, the tips of the protrusions may be sharpened to break through the film formed in the bonding region (4). Preferred specific examples and production examples of such surface materials for sanitary products include the following. First, a spunbond base nonwoven fabric (1) is prepared. As the continuous fibers constituting this spunbond base nonwoven fabric (1), it is preferable to use polyolefin continuous fibers of 1 to 4 deniers. If the polyolefin continuous fibers are less than 1 denier, the fibers tend to be easily cut and the strength does not improve. Furthermore, if the polyolefin continuous fiber exceeds 4 denier, the stiffness of the fiber increases, which tends to lead to a decrease in hand feel. Furthermore, the basis weight of the spunbond-based nonwoven fabric (1) is preferably 8 to 28 g/r+ (. If the basis weight is less than 8 g/rrf, the nonwoven fabric will tend to become thinner and its strength will decrease. 28g/11
(If it exceeds the above, there will be a tendency for excessive quality.) Fibers are blown onto the surface of this spunbond base nonwoven fabric (1) using an olefin base 41 f6 obtained by a melt blowing method to obtain a melt blown nonwoven fabric (2). The polyolefin ultrafine fiber obtained by the melt blow method is
Preferably it is less than 1 denier. If the ultrafine fibers are 1 denier or more, the surface smoothness of the melt-blown nonwoven fabric (2) obtained by accumulating the ultrafine fibers tends to decrease. Moreover, it is preferable that the basis weight of the melt-blown nonwoven fabric (2) is 0.2 to Log/rrf. The basis weight is 0.2g/rr? If it is less than that, the nonwoven fabric will be too thin,
The poor surface smoothness of the spunbond-based nonwoven fabric (1) tends to manifest as it is. On the other hand, if the basis weight exceeds Log/rrf, there will be a tendency for excessive quality. The ultrafine fibers obtained by the melt-blowing process are processed into spunbond-based nonwoven fabrics (
It is preferable to spray it onto the surface of 1) and bring it into contact with the continuous fibers. As a result, the ultrafine fibers adhere to the continuous fibers constituting the spunbond base nonwoven fabric (1) due to their adhesive properties, and the ultrafine fibers are accumulated on the surface of the spunbond base nonwoven fabric (1) to form the melt-blown nonwoven fabric (2). )
This is because the two-year woven fabrics (1) and (2) are joined. Further, according to this preferred embodiment, since both the ultrafine fibers and the continuous fibers are polyolefin-based, they have good affinity and the adhesive strength between them is high, resulting in good bonding strength. In this way, a two-layer laminate of the spunbond base nonwoven fabric (1) and the meltblown nonwoven fabric (2) is obtained. The two-layer laminate may be used as it is or may be subjected to various processing as desired. For example, heat or pressure treatment may be applied between rolls to improve the stability of the surface of the two-layer laminate. Alternatively, the spunbond base nonwoven fabric (1) and the melt blown nonwoven fabric (2) may be partially bonded together by applying partial heat and pressure to increase the bonding strength of the two-layer laminate. The two-layer laminate thus obtained has a spunbond top nonwoven fabric (3) on the melt-blown nonwoven fabric (2) side.
are stacked. As the continuous fibers constituting the spunbond top nonwoven fabric (3), it is preferable to use polyolefin continuous fibers of 2 deniers or less. If the polyolefin continuous fiber has a denier of 2 or more, the surface smoothness tends to be poor and the texture tends to be poor at the 4M end. Also,
The basis weight of the spunbond top nonwoven fabric (3) is 3 to 10 g.
/rrr is preferable, and most preferably 5 to 8 g/r+(.If the basis weight is less than 3g/rd, the nonwoven fabric becomes extremely thin and tends to be difficult to handle.The basis weight is 10g/r+). %, the smoothness of the surface of the melt-blown nonwoven fabric (2) present on the back side becomes difficult to develop on the surface of the spunbond L-tube nonwoven fabric (3),
There is a tendency for the skin to feel worse. A three-layer laminate obtained by laminating the spunbond top nonwoven fabric (3) on the melt-blown nonwoven fabric (2) is subjected to partial thermocompression bonding. As mentioned above, partial thermocompression bonding involves laminating three layers of protrusions heated to a temperature equal to or higher than the softening point of the constituent fibers of the spunbond base nonwoven fabric (1), the melt blown nonwoven fabric (2), and the spunbond top nonwoven fabric (3). Just press it against your body. Each nonwoven fabric (1), (2), (3)
When the constituent fibers are polyolefin-based,
It is sufficient to heat it to about 100 to 150°C. By this partial thermocompression bonding, a bonding region (4) is formed, and each nonwoven fabric (1), (2), (3) is firmly bonded. This bonding region (4) is provided with pores (5). As described above, the pores (5) are also formed by increasing the heating temperature of the protrusion or by increasing the pressing force to form the bonding area (4).
The film formed in the bonding region (4) may be pierced by melting the film formed in the bonding region (4) or by sharpening the tips of the protrusions. The three-layer laminate thus obtained is used as a surface material for sanitary products either as it is or after being subjected to a desired finishing process. As for finishing, a surfactant may be added to improve the water permeability of the three-layer laminate, and a softener may be added to improve the flexibility of the three-layer laminate. Further, a small amount of adhesive may be applied to suppress fuzz on the surface of the three-layer laminate.

【Example】

Polypropylene resin (melt index 30) 28
The continuous fibers are melted by heating to 0'C, extruded using an extruder, spun and drawn to obtain continuous fibers of a predetermined denier, which are assembled on a collector wire to form a sheet, and are made into various spunbond fibers as shown in Table 1. A nonwoven fabric was obtained. Note that the unit of basis weight is g/rrf. Next, polypropylene resin (melt index 130
) is heated and melted at 290°C, extruded with an extruder, passed through a spinneret, and the resin is blown away with high-temperature, high-speed hot air to obtain ultrafine fibers of a predetermined denier. Various melt-blown nonwoven fabrics were obtained as shown in Table 1. Note that the distance from the spinneret to the surface of the spunbond nonwoven fabric was 15 cm. Furthermore, polypropylene resin (melt index 30)
The fibers are melted by heating at 280°C, extruded using an extruder, spun and drawn to obtain continuous fibers of a specified denier, which are assembled on a collector wire to form sheets into various types of spunbond fibers as shown in Table 1. A top non-woven fabric was obtained. This spunbond top nonwoven fabric was laminated on the melt-blown nonwoven fabric surface to obtain a three-layer laminate, which was then passed between an embossing roll and a smooth roll to obtain a surface material. The embossing roll was heated to 120° C., the protrusions had a truncated conical shape, and the diameters of the tips were as shown in Table 1. The number of protrusions is 3/C+a, and there are no protrusions on the laminate.
The linear pressure obtained is 6° kg/'cm. For comparison, two-layer laminates without spunbond top-free fabric, laminates without filmed areas and pores, and various types of spunbond nonwoven fabrics and melt-blown nonwoven fabrics were prepared using the same method as above. The results were obtained as shown in Table 1. The bulkiness, slimy feeling, surface flexibility, fluffiness, and water permeability of the surface materials according to these Examples and those according to Comparative Examples were measured. The results are shown in Table 2. In addition, bulkiness etc. were measured by the following test method. - Bulky property - tested by sensory test based on touch. ◎...very good, ○...good, △...slightly bad ×...poor/slimy feeling; tested by sensory test based on touch. ◎... No slimy feeling at all, ○... Hardly any slimy feeling, △... Some slimy feeling, ×... Slimy feeling first
Table 2 Surface flexibility: Tested by sensory test by touch. ◎...very good, ○...good, △...slightly bad. ×: Bad/fuzz; Judging by visual observation. ◎...No fluff at all, ○...Almost no fluff, Δ...Some fluff, ×...Fuzz ・Water permeability: Surfactant solution (manufactured by Sanyo Chemical Industries, trade name: Sun Silicon M) -84, concentration 0.3%), the surface material etc. according to the example was immersed, dehydrated and dried to prepare a sample. Place this sample on a water-absorbent sheet, and place 20ml of artificial urine on top of the sample.
was added dropwise, and the time taken for the artificial urine to be absorbed was measured. As is clear from these test results, the surface material according to the example has a good balance of bulkiness, surface flexibility, and water permeability, and has no slimy feel or fluff. On the other hand, it can be seen that the surface material according to the comparative example has a poor balance of the above-mentioned performance, or has a slimy feel or fluffiness.

【Effect of the invention】

As explained above, the surface material of the sanitary product according to the present invention is made by laminating spunbond nonwoven fabric on both sides of a meltblown nonwoven fabric, so the spunbond nonwoven fabric can suppress the sliminess and fluffing of the meltblown nonwoven fabric. This has the effect of eliminating discomfort when using sanitary products. In addition, the surface flexibility and good texture of the Mel I blow nonwoven fabric are expressed on the surface through the spunbond nonwoven fabric, and combined with the high tensile strength and bulkiness of the spunbond nonwoven fabric, it is resistant to tearing and has a good texture. The effect is that a good surface material for sanitary products can be obtained. Both spunbond nonwoven fabrics and MeltPro nonwoven fabrics are joined by a bonding area in which the constituent fibers of each nonwoven fabric are softened or melted and solidified, so they can be used as surface materials for sanitary products. When used as ``i, l+'' during use, it is difficult to separate. Furthermore, since the bonding area has pores, when used as a surface material for sanitary products, urine and other excreta pass through the pores, and the urine and other substances are quickly absorbed by the absorbent material inside. play.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an example of the surface material of the sanitary product according to the present invention, and the second circle is a diagram schematically representing the 0111 plane of the central cross section. (1) Spunbond heath nonwoven fabric. (2)... Melt-blown nonwoven fabric (3)... Spunbond tomp nonwoven fabric, (4)...
Combined jii area. (5)... Pore

Claims (1)

[Claims] A three-layer laminate in which two spunbond nonwoven fabrics are disposed on both sides of a meltblown nonwoven fabric, and the two spunbond nonwoven fabrics and the meltblown nonwoven fabric are joined by a bonding area of an arbitrary pattern, and the bonding A surface material for sanitary products, characterized in that the area is provided with pores.