KR100752979B1 - Spun-bonded nonwoven fabric and sanitary supplies - Google Patents

Abstract

A nonwoven fabric composed of a web of thermoplastic filament continuous filaments, the nonwoven fabric being formed by a partial thermocompression-bonded fiber region pattern penetrating between the surface and the back surface of the nonwoven fabric and an embossed concave or convex pattern composed of high density regions of unbonded fibers on both sides of the nonwoven structure. Is a spunbond nonwoven fabric having a sublime ratio of 100 to 400%, in which the structure of the nonwoven fabric is fixed and the ratio of the thickness of the nonwoven fabric to the low density region of the nonwoven fabric to the thickness of the nonwoven fabric including the surface of the convex embossed pattern of the nonwoven fabric. . This nonwoven fabric imparted with a hydrophilic agent is useful as a hygiene material such as disposable diapers.

Thermoplastic Synthetic Fiber, Spunbond Nonwoven, Discontinuous Pattern, Embossed Fatum, Disposable Hygiene Materials

Description

Spunbond nonwoven fabric and sanitary material {SPUN-BONDED NONWOVEN FABRIC AND SANITARY SUPPLIES}

TECHNICAL FIELD The present invention relates to a spunbond nonwoven fabric, and in particular, a flexible, sublime spun in which the nonwoven fabric is fixed by a concave or convex emboss pattern consisting of a discontinuous pattern of partial thermocompression bonding and a high density region of unbonded fibers. As a bond-based nonwoven, it relates to disposable sanitary materials and improved nonwovens useful in disposable sanitary materials.

Hygiene materials used in diapers, sanitary napkins, etc. generally comprise a top sheet for pumping urine or discharge, an absorbent body and a back sheet having waterproof properties, and a cuff for preventing leakage, which is called a three-dimensional gather that utilizes water resistance. As a material used for these sanitary materials, nonwoven fabrics are used a lot in terms of thinness, strength, and soft touch for direct contact with the skin, productivity, and price.

As the top sheet of disposable diaper, which is one of the hygiene materials, is a material that directly touches the skin, it is soft and permeates urine etc. in a moment, and there is little wet back, and durability to repeatedly permeate urine several times. Permeation performance and the like have been required.

At present, the hot air or the partial thermocompression bonding of the sublime fiber using a composite short fiber etc. is used. However, although the nonwoven fabric joined by this hot air has volume and cushioning property, in order to acquire sufficient cushioning property, it is necessary to make nonwoven fabric high basis weight, and also the surface is comprised from a composite fiber, and the nonwoven fabric structure is fused by hot air fusion. By fixing, it becomes a rough, hard and stiff touch nonwoven fabric.

In addition, the point-bond type nonwoven fabric in which the short fibers are partially thermocompressed is low in strength, has a low thickness, and has a problem in that the fiber ends of the short fibers irritate the skin.

On the other hand, the nonwoven fabric by the spunbond method is manufactured by partially thermocompressing a web of filaments and subjecting it to a hydrophilic treatment as necessary, so that the productivity is high, the strength is high, and it has a soft touch. However, in terms of the shape and arrangement of the fibers, performances such as liquid permeability, wet bag characteristics, etc., were generally flat and short fiber nonwoven fabrics were not sufficient. As a method for improving the volume of a spunbond nonwoven fabric, a method of contacting a liquid absorbent core part, stacking a surface sheet composed of an upper surface sheet and a lower surface sheet, and forming an opening liquid conduit of concave portions by the upper surface sheet (Japanese Patent Laid-Open No. 6) -304203), a method of embossing irregularities by heat embossing a web made of bicomponent fibers such as a deep sheath composite fiber or a side by side composite fiber (Japanese Patent Laid-Open No. H11-286863). G), a method of embossing irregularities by performing thermal embossing on a web composed of bicomponent fibers such as a deep-sea composite fiber or a side by side composite fiber to form a convex peak of the uneven shaped film (Japanese Patent Publication) Japanese Patent Application Laid-Open No. 11-347062). However, these methods are punching or shaping and the nonwoven fabric lacks flexibility.

The invention described in Japanese Patent Laid-Open No. 63-17944 according to the present invention is a nonwoven fabric composed of a filament web having a fineness of 0.5d to 5d, and having a partial bonding portion and a non-bonding uneven deformation. However, this invention is a technique of bending a fiber of a non-bonding part, molding an unevenness | corrugation, rubbing a fiber, and noble | softening it, but there is no indication regarding the characteristics, such as liquid permeability required as a sanitary material.

As for the three-dimensional gather which is another item of the sanitary material, the filament web and the melt blown fiber are laminated as a waterproof non-woven fabric especially in the cuff and the back sheet for preventing leakage, and the former has the strength of the latter, the fine covering property of the latter, and the amount of waterproof properties. Laminated nonwoven fabrics utilizing the characteristics are used.

This laminated nonwoven fabric has superior covering properties compared with a conventional monolithic filament web, and thus has a function at a lower basis weight. However, the paper form of the melt blown fiber web with the filament web is further strengthened, and the adhesiveness of the web of the melt blown fiber is also combined, which is hard with a paper-like feel, especially as it becomes a low basis weight. It tends to be a thin nonwoven fabric.

Moreover, as a volume improvement method, the method of contacting a liquid permeable core part, laminating | stacking the surface sheet which consists of an upper surface sheet and a lower surface sheet, and forming the opening liquid pipe of a recessed part by this upper surface sheet (Japanese Patent Laid-Open No. 6-304203). G), a method of shaping unevenness by performing thermal embossing on a nonwoven fabric composed of bicomponent fibers such as a deep sheath composite fiber or a side by side composite fiber (Japanese Patent Laid-Open No. 11-286863), a deep sheath type Non-woven fabric composed of bicomponent fibers such as composite fibers or side-by-side composite fibers is subjected to thermal energy processing to shape unevenness and film-shaped convex apex of uneven shape (Japanese Patent Laid-Open No. 11-347062) Although these methods are well known, these methods are perforated or die-fixed, so the nonwoven fabric lacks flexibility.

Patent application publication (Japanese Patent Publication No. 63-17944) according to the present inventor's application discloses a nonwoven fabric composed of a filament web having a fineness of 0.5d to 5d, and having a partial bonding portion and a non-bonding uneven deformation. However, the patent publication does not describe the use of the melt blown fibrous web, and does not disclose the effect of improving the adhesion of the melt blown fibrous web shown in the present invention.

FIG. 1 (I) is a view schematically showing the planar structure of the spunbond nonwoven fabric of the present invention, and FIG. 1 (II) is a non-woven fabric region of which a nonwoven fabric structure is fixed only by a partial thermocompression bonding fiber region pattern. Fig. 1 is a cross-sectional view of the spunbond nonwoven fabric of which the uneven processing is not performed, and Fig. 1 (III) is a diagram schematically showing the cross-sectional structure of the spunbond nonwoven fabric of the present invention.

Fig. 2 shows an embodiment in which the lattice concave pattern of the high-density region of the continuous non-bonded fibers in the spunbond nonwoven fabric of the present invention is formed, that is, the lattice concave pattern which is particularly continuously connected to the first side of the nonwoven structure. The figure which abbreviate | omitted illustration of the thermocompression bonding fiber area pattern is shown.

FIG. 3 is a spunbond nonwoven fabric of the present invention in which the high-density region concave pattern of the non-bonded fibers is discontinuous, and similarly to the example of FIG.

FIG. 4 is a spunbond nonwoven fabric of the present invention formed by successive continuous dense-pattern concave patterns of unbonded fibers, similarly to the example of FIG. .

FIG. 5 is a diagram showing a relationship between thickness under various loads of the spunbond nonwoven fabric according to Example 1 and Comparative Examples 1, 5, and 6 of the present invention.

6 is a view comparing thickness under various loads of the spunbond nonwoven fabric of Example 8 and Comparative Example 8 of the present invention.

Fig. 7 (I) shows the manufacture of the spunbond nonwoven fabric as an example of the present invention, and Fig. 7 (II) shows the structure of the spunbond nonwoven fabric before the concave-convex processing is performed in the region of the unbound fiber of Fig. 7 (I). It is an enlarged view of the micrograph shown.

Fig. 8 (I) shows the structure of the spunbond nonwoven fabric of the present invention with the melt blown fibrous web as another example, and Fig. 8 (II) shows the spunbond before the uneven processing is applied to the unbonded fiber section of Fig. 8 (I). It is an enlarged photomicrograph which shows the structure of a system nonwoven fabric.

An object of the present invention is to solve the above problems, to provide an improved spunbond nonwoven fabric as a sanitary material useful for the production of disposable diapers and the like, which has a sublime, soft touch, high permeability, low wet bag and excellent strength. It is.

It is another object of the present invention to provide an improved sanitary material of spunbond nonwoven fabric by the spunbond method which can be manufactured under high productivity.

The basic structure of the nonwoven fabric of the present invention is a nonwoven fabric composed mainly of a web of thermoplastic synthetic fiber continuous filaments, and is non-bonded to both sides of the partial thermocompression-bonded fiber region pattern and the nonwoven structure which are integrated through the surface and the back surface of the nonwoven fabric. The structure of the nonwoven fabric is fixed by an embossed convex or concave pattern composed of a high density region of the fiber, and the nonwoven fabric occupies the non-woven fabric low density region of the nonwoven structure with respect to the thickness of the nonwoven fabric including the face of the convex embossed pattern of the nonwoven fabric. It is a spunbond type nonwoven fabric characterized by the sublime ratio represented by the ratio of thickness being 100% or more.

It is also one of the preferable basic aspects of the spunbond nonwoven fabric of this invention to employ | adopt the nonwoven fabric structure which added the melt blown fiber layer to the thermoplastic synthetic fiber filament layer.

That is, a nonwoven fabric formed of a composite web formed by laminating at least one layer of thermoplastic synthetic fiber continuous filament webs and at least one layer of melt blown fibers, wherein the partial thermocompression-bonded fiber region pattern and the nonwoven structure penetrate between the front surface and the back surface of the nonwoven fabric. The structure of the nonwoven fabric is fixed by the embossed convex or concave pattern composed of the high density region of the unbonded fiber on both sides of the nonwoven fabric, and the nonwoven fabric having the nonwoven fabric structure with respect to the thickness of the nonwoven fabric including the surface of the convex embossed pattern of the nonwoven fabric. By using a spunbond nonwoven fabric having a sublimation ratio of 100% or more, which is expressed by the ratio of the thickness of the nonwoven fabric occupied by the low density region, it is possible to further enhance the basic performance of the sublime properties (bulkness, bulkness) and flexibility desired as a sanitary material.

The basic structure of the spunbond nonwoven fabric 1 of this invention is shown in FIG. As shown in Fig. 1 (I) and Fig. 1 (II), the nonwoven fabric structure is (A) partially thermocompression-bonded fiber region embossed pattern (hereinafter referred to simply as partial thermofusion) and (B) unbonded fiber. It is fixed by the embossed convex or concave pattern which consists of a high-density area | region of this. The pattern of (A) and (B) shown in FIG. 1 is the pattern typically shown, and the actual pattern can change both a shape and a pitch in both (A) and (B). And each pattern of (A) and (B) is arrange | positioned discontinuously or continuously independently of the front and back surface of a nonwoven fabric structure, respectively. The nonwoven fabric is in contact with the above (A) and / or (B) and additionally includes a low density region of the non-bonded fiber of (C). Here, (A) the partially thermocompression-bonded fiber region embossed pattern is given by thermal embossing, and (B) the embossed convex or concave pattern composed of the high-density region of the unbonded fibers is at a low temperature or at a temperature at which the fibers are not fused. It is an embossed pattern provided, and it is a pattern molded in the opposite direction from the upper surface (1st surface) and the lower surface (2nd surface) of a nonwoven fabric (refer FIG. 1 (III), FIGS. 2-4). One specific example of the spunbond nonwoven fabric of the present invention is shown in FIG. 7 (I), the nonwoven fabric structure in which the embossed pattern of (A), (B), and (C) is formed can be seen. Fig. 8 (I) is an example of the spunbond nonwoven fabric of the present invention including the lamination of a melt blown fibrous web, and like the example of Fig. 7, the patterns of (A), (B) and (C) are formed. The nonwoven structure can be seen. As mentioned above, from FIG. 7 and FIG. 8, the specific aspect of the fixing structure of the nonwoven fabric structure of this invention containing said (A), (B), and (C) mentioned above will be understood clearly.

In the spunbond nonwoven fabric of the present invention, the sublime ratio is the thickness of the nonwoven fabric occupied by the low density region of the nonwoven fabric of the nonwoven structure with respect to the thickness (b) of the nonwoven fabric including the face of the convex embossed pattern of the nonwoven fabric (a). It is expressed as the ratio of, i.e., the value calculated by the following equation (see Fig. 1 (III)).

Sublimation rate (%) = (b / a) * 100

Here, the thickness (a) of the low-density region of the non-bonded fiber is the thickness before the uneven embossing under low temperature, and therefore the sublimation ratio may be calculated based on the difference in the thickness before and after the uneven processing. The sublimation ratio is important from the viewpoint of determining the flexibility of the nonwoven fabric, which suggests that uneven processing at low temperature imparts a rubbing action to the nonwoven fabric structure.

In addition, the spunbond nonwoven fabric of the present invention additionally contains a hydrophilizing agent mainly in the high-density region (B) of the non-bonded fiber, thereby satisfying four characteristics of desired performance as a sanitary material, bulky, flexible, permeable, and wet bag at the same time. It can be modified into a satisfactory nonwoven fabric.

Hereinafter, the present invention will be described in detail.

As the fibers constituting the spunbond nonwoven fabric of the present invention, polyolefin-based fibers such as polypropylene, polyethylene, or copolymers thereof are preferable in terms of low water-retaining properties of the fibers and wet bag characteristics, and are preferably polyethylene terephthalate and polybutylene. Polyester fibers such as terephthalate, polytrimethylene terephthalate (PTT), or copolymers thereof are preferred in terms of elasticity and softness, and nylon 6, 66, 610, 12 or copolymers thereof. Polyamide fibers are preferred for obtaining a nonwoven fabric having moist and flexible properties. If necessary, mixing with these composite fibers, mixed fibers, and fibers having other special functions is also possible.

The nonwoven fabric is required to be strong when the surface is wet with urine and to cope with movement of the body during use, and also in terms of productivity, a spun bond formed by using a continuous filament (web) as a web and joining it. Nonwoven fabric by the method is preferable. The nonwoven fabric by the spunbond method has a long fiber length, has practical strength, excellent breathability, and unlike the wet method or the dry method, the fiber is sheeted as it is without performing an emulsion treatment. It is possible to make use of properties such as water repellency peculiar to fibers.

Bonding of the fibrous web in the nonwoven structure is preferably performed by partial thermocompression bonding in order to have the strength and flexibility of the nonwoven fabric and the feel of the fibers themselves. The thermal pressure fusion area ratio in partial thermocompression bonding is preferably 5 to 40%, more preferably 5 to 25% in terms of strength retention and flexibility. Partial thermocompression welding can be performed in addition to the ultrasonic welder or the like by passing a web between heat embossed rollers heated up to the melting point of the constituent fibers or the like. Thereby, the front and back of a nonwoven fabric structure are integrated, and the dents, such as a pinpoint shape and a rectangular shape, are scattered on the whole nonwoven fabric whole surface, for example. Naturally, this thermocompression-bonding part is crimped | bonded and has the property of a film, but the fiber around it has the touch peculiar to the fiber used.

The thickness of the nonwoven fabric by only the partial thermocompression bonding varies depending on the configuration of the fiber, the shape of the embossing, and the arrangement. However, the thickness of the nonwoven fabric of the normal round cross-section fiber is not large. . Especially in the normal web by a spun bond method, the arrangement | sequence of the fiber at the time of its formation is also planar, and it does not have a bulkiness.

On the other hand, partial thermocompression bonding is formed by partially applying pressure in an embossed pattern shape at a temperature below the melting point of the constituent fibers and partially bonded by heat and pressure. Unlike the film which is fused at a temperature above the melting point to form a film, the portion is “part of having the properties of the film” bonded while leaving a fibrous shape, and the partial heat pressure welding is used to distinguish it from the high-density part formed by the non-bonding uneven processing.

As described above, the spunbond nonwoven fabric of the present invention is a nonwoven fabric integrated in front and back by a partial thermocompression welded portion, in which one side has a concave portion of a high-density region of the unbonded fiber, which is different from the pattern of the thermocompression welded portion, Since the nonwoven fabric structure is formed with convex portions in the high density region of the non-bonded fibers, the nonwoven structure is integrated with the front and back by interposed partial thermocompression bonding portions, but the other portions are convex or concave embossed patterns of the high density region of the non-bonded fibers. It consists of two areas of low density and non-bonded fiber and different fiber density, and each has a rubbing action of low temperature embossing molding to form a structure that makes the fiber easy to move, so it is soft and bulky. The nonwoven fabric structure is formed.

The high-density area of the non-bonded fiber is a zone indicated by B in Figs. 1 to 3 and is a zone in which fusion or adhesion between fibers is not performed, and the density of the fibers compressed and dense by compressing the concave-convex portion of the embossing roller for concave-convex processing When referring to a high fiber area, it is 15 to 35% of range, for example by fiber volume fraction. And in this invention, the area ratio of the high density area | region of an unbonded fiber is 5-50%, Preferably it is 5-25%. Here, the calculation of the partial thermocompression bonding part is calculated from the shape of the thermocompression bonding embossed pattern. The size and pitch of the nonwoven fabric which is a sample were magnified under a microscope, and fused to each other and appeared to have the properties of a film, the size and pitch were measured, the area was calculated | required, and the area ratio with respect to the area of the whole sample was computed.

The low density region of the non-bonded fiber is a region indicated by C of FIG. 1 and corresponds to a portion which is not compressed by the embossing roller for uneven processing without fusion or adhesion of the fiber, and the fibers are denser than the high density region of the non-bonded fiber. It is an area | region which does not have and generally has fiber density before a uneven process. Therefore, the fiber in this low density region is sublime, has freedom of movement, and has the soft texture of the fiber. For example, the fiber volume fraction in the low density region of the unbound fiber is in the range of 5 to 15%. The area of the high density region of the non-bonded fiber is modeled after the trace of crushing or partially deforming the constituent fibers in the high density region of the fiber formed by pressing the embossed pattern, obtaining the area, and calculating the area ratio with respect to the entire area of the sample. Calculate. As the fiber shape of the high density region of the non-bonded fiber, the constituent fiber simply showed the constriction or included the fiber with little deformation.

The high density region of the non-bonded fiber has a thin thickness and the fiber is treated with a hydrophilizing agent because the hydrophilic agent is contained in the high density region, so that the liquid permeability is good, the outer surface is smooth, and the smooth soft texture Gives.

The non-bonding low density region is thicker than the high density region, has a lower density of fibers, is flexible and sublime, and has good liquid permeability, but acts as a barrier to the wet bag of the liquid, and the wet bag characteristics of the liquid (wet Bag) is good.

The above operation will be described using the cross-sectional views of FIGS. 1 to 3 schematically show the structural features of the nonwoven fabric of the present invention.

(A) Partial thermocompression bonding is an area which acts to maintain the strength of the entire nonwoven fabric, and has a proper area ratio.

(B) The non-bonding high density region is a region of B, has a shape protruding from the surface of the nonwoven fabric, and therefore has the effect of making the entire nonwoven fabric bulky. In addition, by containing a large amount of the hydrophilizing agent in the region of B, the hydrophilicity of the portion is greatly improved, and it has an effect of improving the permeability of the liquid through the region of B.

(C) The non-bonding low density region is a region of C, has a high degree of freedom of fibers, abundant flexibility, and has a soft feel. In addition, the region of C acts as a barrier against the return of the liquid from the absorber by the bulky effect, and has the effect of improving the wet back characteristic.

Moreover, it has the effect | action which gives the property which is easy to bend at the boundary with B. Thus, as a feature of this invention, each area | region of (A), (B), and (C) has said effect, respectively, and has the effect | action suitable for sanitary material as a whole.

The nonwoven fabric of the present invention utilizes the composite fibers shown in the prior art, and is completely different from the hard, rugged nonwoven fabric which is fused together by bonding, hot air treatment, or the like.

The present invention provides a fibrous layer that is partially deformed (stretched) by imparting non-bonding and uneven deformation to a fiber layer having a degree of freedom, so that the cushioning property is good, and thus it is difficult to compress when applied to a load. Has For this reason, since it is bulky under load, and becomes porous, it can be said that it is easy to permeate a liquid (fast liquid rate), and it becomes difficult for the wet bag of the liquid absorbed once absorbed.

The concave-convex deformation imparted to the nonwoven fabric of the present invention is a concave or convex deformation of any shape that does not partially coincide with the pattern of the joint to which it is partially joined, and the shape, size, and depth of the concave or convex part are related to the flexibility effect with respect to the bonding pattern. It is important.

As the shape of the concave or convex, for example, it is considered to be a straight line, a curve, an angle, a circle, a checkerboard shape, or other continuous or discontinuous, but in terms of the flexibility effect, the depth of the concave or convex portion is The deeper the 0.2-5mm, the greater the effect. Moreover, it is preferable that the magnitude | size of a discontinuous convex part pressing surface is 0.1-5 mm, and the pitch of a concave or convex part is 0.5-5 mm.

In FIG. 1, the planar observation structure of the whole nonwoven fabric of this invention is shown typically. 2 and 3 show an example of embossing a rectangular fabric on a nonwoven fabric. 2 and 3 show two examples of patterns of unbonded convex-concave processing, and in the drawing, the pattern of the heat-sealed portion and its distribution are omitted.

For example, as shown in Fig. 3, by pressing the embossed pattern interspersed with the convex portions, concave portions scattered discontinuously in the high density region are formed. Further, as shown in FIG. 2, the non-pressing portion is in a state in which the fiber layer is raised in the state where the high density region is continuous by the pressing of the embossed pattern in which the convex portions are continuous. Although the pitch of the deformation | transformation by a continuous pattern is based on the pattern, 1-5 mm is preferable, and it is preferable that the magnitude | size of a recessed part is the line or dotted line shape whose width is 0.02-3 mm.

Due to the bulky effect of forming a high density region, the thickness is increased, thereby improving the sublimeness of the nonwoven fabric structure, and the thickness variation with respect to the load is small. The present inventors have found that adding a hydrophilizing agent to a nonwoven fabric increases the concentration of the hydrophilizing agent in the high density region of the unbound fiber.

The larger the nonwoven fabric becomes, the softer the flexible fabric becomes, but the pitch of the uneven deformation and the size of the concave portion do not increase the thickness too much, so that a delicate fiber feel is obtained.

The sublimation rate of the nonwoven fabric of this invention is 100% or more, Preferably it is 105-400%, More preferably, it is 110-300%, Especially preferably, it is 120-200%. As the sublimation ratio increases, the decrease in thickness with respect to the load also decreases, and the cushioning property of the nonwoven fabric is improved.

The thickness change with respect to the load of the spunbond type nonwoven fabric of this invention is illustrated in FIG. 5, FIG. The spunbond nonwoven fabric of the present invention can be said to have a large thickness for each load, sublime, and good compressive properties with respect to the load. From this, when the spunbond nonwoven fabric of the present invention is used as a top sheet of a disposable diaper, for example, there is little decrease in the thickness with the passage of the use time, and the effect that the softness and the sublime characteristics during use of the diaper persist. It is large. In addition, even in the wet state, the thickness decreases little, and since the sublimeness is large with respect to the return of the liquid from the absorber, a favorable effect can be obtained.

The method of imparting the concave of the spunbond nonwoven fabric or the convex embossed pattern of the unbonded fibers has, for example, a concave, convex or concave-convex shape on the surface, and between the rollers to which both are fitted tightly, concave on one surface, It is common to press between the convex and flexible rollers or to treat them between the plates, but as a special method, the cloth is forced to overfeed at a constant rate between the rollers of narrow gaps, and the molding of small corrugated shapes There is also a way.

FIG. 4 shows an example in which the uneven deformation is given by passing between two rollers, each of which has a round uneven shape on the surface so that the two are fitted together.

Particular attention should be paid to the conditions of concave and convex moldings at the time of treatment and the pressure applied to the nonwoven fabric. Although the temperature at the time of treatment may be room temperature, it may be heated and plasticized and molded as needed, or it may raise and process temperature in the range which does not produce a bond or a set of fibers for the purpose of taking form stability. For example, in the case of a polypropylene nonwoven fabric, the range of 30-110 degreeC is preferable. Although the embossing pressure varies depending on the temperature, it is natural to set the pressure at which the molding is sufficiently performed. On the other hand, deformation of the fiber cross section of the compressed portion occurs by this molding. Since the partial deformation effect gives more flexibility, it is also effective to perform a higher pressure treatment. Of course, it is necessary to employ conditions in which temporary fixation or thermocompression bonding between fibers in the compression section does not occur. For example, in the case of a polypropylene nonwoven fabric, the range of 20-150 kg / cm is preferable.

In the spunbond nonwoven fabric of the present invention, it is preferable that the high-density region concave portions of the non-bonded fibers molded on one surface of the nonwoven fabric form convex portions of the non-bonded high-density fibers on the opposite side. For example, in the case where the concave portions form continuous high density regions on one surface, it is preferable that the convex shape protruding from other regions is formed so that the high density region becomes a convex portion on the other surface. This is important from the viewpoint of making the apparent thickness of the whole nonwoven fabric more than the thickness of a web, and giving a hydrophilic agent to a specific site | part.

For the hydrophilization treatment of the spunbond nonwoven fabric of the present invention, a known method such as dipping method, spraying method, coating method (roll coater, gravure coater, die, etc.) can be adopted using a dilute hydrophilizing agent solution. After imparting a hydrophilic agent, the nonwoven fabric is dried using a drying means such as hot air or a heat roller.

In the hydrophilization treatment, it is considered that the adhesion distribution of the treatment agent is different in the high-density region and other portions provided earlier. When the treatment agent solution is applied, the liquid is largely contained in the low density, so-called rough portion of the fiber, but as the nonwoven fabric dries, the liquid moves to the dry portion. For this reason, although the nonwoven fabric is thin in the high-density area | region of a nonbonding fiber, it is thought that the adhesion of a processing agent increases and liquid passes easily. In addition, since the low-density region hardly compresses and becomes bulky, the liquid that has once passed through is far from the absorbing layer and is difficult to wet back. As a result, the hydrophilizing agent is mainly contained in the high-density region of the non-bonded fiber, and the effects such as the improvement of the permeability of the liquid peculiar to the spunbond nonwoven fabric of the present invention, the improvement of the wet bag properties, the improvement of the liquid flow, etc. Obtained.

Prior to the hydrophilization treatment, corona treatment, plasma treatment or the like is also preferable from the viewpoint of improving the degree of hydrophilization. Processing such as corona treatment is a pretreatment for printing, and the like, and may be a general treatment used for improving wettability characteristics. For example, a non-woven fabric is supplied by discharging high frequency power between a discharge electrode and a processing roller by a high frequency generator. Passes between them and processes them. Although it depends on the required wettability and processing conditions, it is preferable to set discharge conditions so that the surface tension of a process surface may be 37-40 mN / m. On the other hand, when the corona discharge treatment is performed, the wettability of the nonwoven fabric itself is different. Therefore, it is natural to adjust the amount of the hydrophilizing agent to obtain the required performance. If the surface tension of the nonwoven fabric is in the range of 37 to 40 mN / m, the affinity between the hydrophilic agent and the surface fibers of the nonwoven fabric is remarkably improved, and the hydrophilic agent can be imparted at low concentration and uniformly. In the present invention, the hydrophilizing agent is preferably applied after uneven processing of the non-bonded fiber region, but there is no problem even if it is applied before uneven processing.

In using the spunbond nonwoven sanitary material of the present invention which has been treated with a hydrophilic agent, it is natural to select the performance to be applied or the method of use depending on the desired characteristic level as the sanitary material, but the difference in the feel of the front and back of the nonwoven fabric Also related. The high density areas of the fibers in the molded concave and convex patterns are not bonded to each other, but because they are fixed relative to others, the absorbent side on the opposite side of the skin that does not directly touch the skin on the nonwoven fabric surface when used as the top sheet of the diaper. It is also a preferable aspect to make a high density area | region into the skin surface of a top sheet when arrange | positioning to the said material or placing emphasis on hydrophilicity.

The spunbond nonwoven fabric of this invention has the aspect which uses the laminated body of two or more layers which laminate | stack at least 1 layer of filament web and at least 1 layer of melt blow web in a nonwoven fabric structure.

In this case, the fiber material described above is effective as a fiber used for a nonwoven fabric. If necessary, mixing with these composite fibers, mixed fibers, and fibers having other special functions is also effective. Even if the filament webs are different materials between layers, the filament webs and the melt blown fibrous webs may be different materials. Materials having affinity with water, such as polyester fibers and polyamide fibers, are improved in terms of water resistance and water repellency, by treatment or addition with a water repellent such as silicone, fluorine, or wax, or water repellent, as necessary. It is necessary to do

The nonwoven fabric is required to be strong enough to cope with the movement of the body during use, and in terms of productivity, it is a laminate of two or more layers formed by laminating at least one layer of filament webs and at least one layer of melt blown fiber webs. The nonwoven fabric formed by bonding together is preferable. Although the laminated structure may simply be a lamination of a filament web and a melt blown fibrous web, in order to supplement a web of melt blown fibers having a weak surface strength, a laminate of a melt blown fibrous web layer is usually used between the filament web layers. It is useful to make the layer bilayer. Moreover, what laminated | stacked after joining each web may be sufficient.

The filaments constituting the spunbond nonwoven fabric are 0.5 to 5 dtex, and have a long fiber length, have practical strength, excellent breathability, and unlike the wet or dry method, the fibers are not subjected to emulsion treatment or the like. Since the sheet is formed, properties such as water repellency peculiar to fibers can be utilized.

The melt blown fibrous web is formed of thin fibers of 1 to 6 mu m, as described in, for example, Japanese Patent Publication No. 56-3351, USP3,978,185, USP3,825,380 and the like, and has excellent covering properties. For example, in a polypropylene material, it contributes to the water-repellent and waterproof effect further. Since the melt blown fibrous web is a thin fiber, it is easier to join than the filament web because of low crystal orientation. On the other hand, when used as a single body, even when bonded, the strength is weak, and the paper-like (paper-like) texture becomes hard. For this reason, by laminating the filament web and the melt blown fibrous web, it is possible to compensate for the respective defects and to be excellent in practical strength, covering properties, water repellency, and water resistance.

Bonding and fixing of the web are preferably performed by partial thermocompression bonding using a thermal emboss roller in order to have the strength and flexibility of the nonwoven fabric and the feel of the fibers themselves. The thermal pressure fusion area ratio in partial thermocompression bonding is preferably 5 to 40%, more preferably 5 to 25% in terms of strength retention and flexibility. Partial thermocompression welding can be performed by ultrasonic method or by passing a web between heating emboss rollers, thereby integrating the front and back, for example, the shape of ups and downs, such as a pinpoint shape, an ellipse shape, a diamond shape, and a rectangular shape. It is scattered on the whole surface of this nonwoven fabric. Naturally, the hot press is pressed and has the properties of a film, but the fibers around it, in particular the filament webs, leave a unique feel to the fibers used.

Under the conditions of joining the filament web layer, the melt blown fiber web layer is very thin, and the paper-like (paper-like) feel is caused by heat from the characteristics such as when the fiber is formed, and the nonwoven fabric as a whole has paper-like hardness. In addition, although the thickness of the nonwoven fabric by partial thermocompression bonding varies depending on the configuration of the fiber, the shape and the arrangement of the emboss, the adhesive effect peculiar to the melt blown fibrous web layer is generated, and the thickness is thin and there is no bulkiness. do. As a method for improving the bulk property, there are methods for punching or shaping a hole as shown in the prior art, but these are laminated with at least one layer of filament webs and at least one layer of melt blown fiber webs as in the present invention. It is not intended to obtain the volume or softness of a nonwoven fabric obtained by integrating front and back by discontinuous partial thermocompression bonding parts interspersed with two or more layers formed by non-bonding irregularities, and melt blown fibers. It does not improve the adhesive effect of the web layer.

The point of this invention in the design which laminates a melt blown fiber web in a nonwoven fabric structure is the ratio which spread | disperses two or more laminated bodies formed by laminating | stacking at least 1 layer of filament webs and at least 1 layer of melt blown fiber webs on the surface. The nonwoven fabric integrated into the front and back by the continuous partial thermocompression welding part is additionally subjected to the treatment of imparting non-bonding concave-convex deformation by embossing or the like, so that the fibers of the intersect thermocompression welding part are partially combined and integrated into the front and back. The fibers of the non-bonded concave-convex portions of the other parts have a soft touch of the fibers themselves.

In the melt blown fibrous web layer, even though there is some adhesive effect, it is considered to be in a temporarily fixed state unlike thermocompression welded parts, and the composite fibers are different from each other in that they are stiff and mutually fused together by heat treatment for bonding. . In addition, sufficient sublimeness is obtained by providing a fiber layer subjected to partial deformation (stretching) by imparting non-bonding and uneven deformation force to a fiber having a degree of freedom. When the load is applied, unlike the original fibrous layer, it has a property that is difficult to compress. In other words, the line tends to bend easily, and softness and bulkiness (thickness) appear.

In FIG. 6, regarding Example 8 and Comparative Example 8, the thickness change curve of a nonwoven fabric with respect to a load is shown. In the present invention, even if a load is applied, it is a nonwoven fabric which has a characteristic that is hard to be compressed and has less deterioration in sublimation with respect to the load.

The concave-convex embossed pattern of the high-density fiber region composed of the non-bonded fibers imparted to the spunbond nonwoven fabric of the present invention is a non-bonded concave or convex deformation of any shape that does not partially coincide with the pattern of the bonded portion that is partially joined. Alternatively, the shape, size, and depth of the convex portion are important for the flexibility effect with respect to the coupling pattern. For example, as the shape, straight lines, curves, angles, circles, checkerboard shapes, and other continuous or discontinuous ones are considered. In view of the flexibility effect, the depth of the concave or convex portions is preferably 0.2 to 5 mm, and moreover. The deeper the irregularities, the greater the effect.

The size of the pressing surface of the discontinuous pattern is preferably 0.1 to 5 mm, and the pitch of the concave or convex portions is preferably 0.5 to 5 mm. In the patterns of FIGS. 1 (I) and 3, the embossed patterns interspersed with the convex portions are pressed to form concave portions scattered discontinuously in the high density region. Moreover, the pressurization of the embossed pattern by which the convex fringes of FIG. 2 and FIG. 4 continue is made, and the fiber layer of a non-pressurized part bulges in the state which the recessed part of a high density area continued. As for the deformation pitch by continuous embossing, 1-5 mm is preferable, and it is preferable that the magnitude | size of a recessed part is made into the line or dotted line shape whose width is 0.02-3 mm.

In the spunbond nonwoven fabric in which these molded concave-convex patterns are formed, the partial thermocompression bonding part is a pattern which does not partially coincide with the molded concave-convex pattern, and is a high density region of the unbonded fibers and a low density region of the unbonded fibers (FIGS. 1 to 4). (See C).

5-40% is preferable and 5-25% of the area ratio of the press part of the unevenness | corrugation high density area | region of a nonbonding fiber high density from a viewpoint of obtaining favorable softness and a fiber feel is more preferable. Considering the practical aspect, the larger the apparent thickness is, of course, the more flexible, but the smaller the pitch of the deformation and the concave portion are, the more compact the effect is obtained, and 100% or more in the sublimation ratio before and after imparting non-bonding deformation. Preferably it is 105% or more, More preferably, it is 130% or more.

The method of imparting a concave or convex pattern is a spunbond nonwoven fabric provided with partial heat fusion by thermal embossing, for example, between rollers having concave, convex or concave-convex shapes on the surface thereof, and the two of which are tightly fitted. It is common to press between the rollers which have concave and convex shapes on the surface, and flexible rollers, such as a paper roller, a rubber roller, and a resin roller, or to process between plates. As a special method, there is also a method of forcibly overfeeding a cloth between rollers of a narrow gap at a constant rate and molding a small corrugation shape.

Particular attention is to be paid to the temperature at the time of treatment and the pressure applied to the fabric under conditions of concave and convex moldings. In particular, in the aspect of the nonwoven fabric which contains the melt blown fiber layer of this invention, compared with the nonwoven fabric of only a simple filament web, a deformation | transformation effect is easy to receive. For this reason, in order to suppress the adhesive effect of a melt-blowing fiber layer for softness, it is preferable to set processing temperature low compared with the single body of a filament web, and it can set suitably according to a fiber material. For example, when using a polypropylene as a raw material, it is preferable to set it to the temperature of 60 degrees C or less, 50 degrees C or less is more preferable, and it is also effective to cool actively as needed.

On the other hand, the temperature may be increased to facilitate plasticization and molding by increasing the temperature in a range in which no bond or set of fibers occurs, or may be treated to take form stability. Although the pressure at the time of processing changes with temperature, it can also set to the pressure by which deformation is fully performed. On the other hand, the deformation of the fiber cross section of the compressed portion is caused by applying this strain, and in order to give more flexibility, it is also effective to perform a higher pressure treatment. Of course, it is necessary to pay enough attention not to cause temporary fixation or thermocompression bonding of the fibers in the compression section.

As a preferred embodiment of the present invention, it is preferable that one surface is a high density region of the pressurized convex portion, and the opposite surface forms a concave portion with high density. That is, for example, when a continuous concave portion (high density region) is formed on one surface, it is preferable to have a shape protruding from other regions so that the high density region becomes a convex portion on the other surface. The apparent thickness of the whole nonwoven fabric has an important meaning which is more than the thickness of a web. In this way, since the high density to low density region is formed without bonding, the entire fabric is easily bent thickly and easily by bending force, so it becomes soft, thin, and has a completely different feel from paper and the like. . In order to further strengthen this treatment effect, the treatment may be performed in multiple stages.

It is also effective to use the nonwoven fabric of this invention by providing various processing agents, such as an antistatic agent, a softening agent, a hydrophilizing agent, and a lubricating agent, as needed.

When the spunbond nonwoven fabric of the present invention is used in a sanitary material, the performance to be applied or the method of use is selected according to the desired characteristic level as the sanitary material. It is also necessary to consider the difference in the feel of the front and back of the nonwoven fabric. In other words, the pressurized high-density region is not bonded, but is fixed compared with other places, so that this surface is disposed on a side which does not directly touch the skin, for example, or is disposed in consideration of the utilization of the convex portion.

It is economically preferable to perform the uneven | corrugated processing at low temperature in the present invention on-line in the manufacturing process of a spunbond nonwoven fabric, but it can also introduce it into a part of production and processing line of a diaper, and to process it offline. have.

Hereinafter, an Example and a comparative example demonstrate this invention in detail.

First, a measuring method and an evaluation method are demonstrated.

(1) basis weight of nonwoven fabric

A 10 cm square nonwoven fabric is collected and the weight is represented by the weight per m 2.

(2) thickness of nonwoven fabric

Nakayama Denki Sangyo Co., Ltd., Compression Elasticity Tester E-2 type was used, and it measured under each load of 1.3, 10, 37.5, 50, 100 g / cm <2> in 4 cm <2> of measurement areas.

(3) Sublimation rate of nonwovens

The change rate of the thickness (under 10 g / cm <2> load) of the nonwoven fabric before and after providing the high density area | region of the nonbonding fiber of this invention was made into the sublimation rate.

(4) strength of nonwoven fabric and stress at 5% elongation

The test piece of width 3cm and length 20cm was tension-tested by the sheet width 100mm and test speed 300m / min using the Tenshiron made from Shimadzu Seisakusho, and the strength of the longitudinal direction and the lateral direction, and The stress at 5% elongation was measured.

(5) bending flexibility of nonwoven fabric

As an index indicating flexibility, it is represented by bending flexibility measured by the following method.

The measuring method leaves 1 cm of one end in the measurement direction of the test piece, presses it to the test piece in the right angle direction over the full width, and does not fold the gold at the other end of the test piece. Put it up. While pressing by hand on the end of the pressed side of the scale, move it into the loop while sliding the scale over the specimen.

The point where a loop extended by the repulsive force of a sample is made into an end point, and the length from this point to a loop side end part is made into the critical length (mm), and is represented by the average value of front and back. Shorter ones indicate flexibility.

(6) measuring surface of permeability performance

Permeability performance used the nonwoven fabric as a top sheet of disposable sanitary material, and made the side used as a skin surface the measurement surface of permeability performance. "Upper surface" or "lower surface" shown in the column of "Permeability performance measurement surface" of Table 1 has shown the characteristic of the side used as a skin surface, respectively.

(7) instant pitching speed

As an absorber, a measuring instrument (approximately 800 g, formed with a hole having a diameter of 25 mm in the center at 10 cm square and formed two electrodes toward the center and connected to a timer) was placed on the sheet of paper, and the measurement was carried out. A 10 cm square (or more) is placed between the absorber and the measuring instrument, and one drop (0.1 kL / drop) of physiological saline is dropped from the dropper of 15 mm above the fabric. The time from the dropwise addition to the end of the fabric surface passage was measured with an electrode, and the instantaneous water permeation rate (second) was set.

(8) 5 s permeation rate (sec / 5 s), wet bag amount (g)

As the absorber, in order to uniformize the characteristics of the absorber, a specific filter paper (" 939 " square 10 cm x 3 sheets foam made by Eaton Dikeman) is placed under the measuring instrument (same as the instantaneous water permeation velocity measuring instrument). A test cloth (10 cm square) is placed on the absorbent, first of which 5 µL of artificial urine is dropped from the upper 25 mm, which is 45 ± 3 dynes / cm (mN / m) by adding a non-ionic activator to physiological saline. The dropping speed was 3.3 seconds / 25 kPa, and the time from dropping to the end of the passage of the fabric surface was measured with an electrode, and the water permeation rate (second / 5 kPa) was set.

Subsequently, artificial urine is added as it is, so that the total liquid amount is about four times the weight of the absorber so that the amount of liquid contained in the absorbent is fixed. In this state, a load of 800 g / sq. 10 cm from the test cloth is applied for 3 minutes, and the distribution of the liquid in the absorber is fixed. Then, a pre-weighed filter paper (" 631 " square 12.5 cm x 2 sheets manufactured by Eaton Dikeman, Inc.) was placed on the test cloth, and 3600 g / sq. The increase was measured and taken as the wet bag amount (g).

(9) liquid flow

Ten toilet papers are arranged as absorbers on a 45 ° ramp, and a test cloth is brought into close contact therewith, and a drop of physiological saline is added dropwise from the dropper of 15 mm above the fabric. The length which flowed from the dripping part of the fabric surface to the completion | finish of passage was measured, and it was set as liquid flow (mm).

(10) Durability Permeability Transmittance

Ten toilet papers are arrange | positioned as an absorber on a plane, and a test cloth is made to adhere on it. One drop (0.1 kPa / drop) of physiological saline is added from the dropper of 15 mm above the fabric. What was absorbed within 2 second of a dripping liquid is made into permeation | transmission. After the surface is dried, 1 drop is dropped again at the same position, and the second test is performed. Similarly, the third test is repeated. It tested about 10-40 places of the same sample, and made ratio of the number of passage water with respect to the dripped number the durable permeability transmittance (%).

(11) fine island

The diameter of the fibers constituting the nonwoven fabric was measured under a microscope (Kiens High Magnification Microscope VH-8000) and expressed as fineness (dtex: weight of filament 10000 m in length) calculated from the density of the fiber polymer as a round cross-section fiber. On the other hand, the fineness of the melt block fiber web is represented by the fiber diameter.

(12) softening rate of nonwoven fabric

The rate of change of the softness in the longitudinal direction before and after imparting a high density region of the unbonded fibers of the present invention (after / after treatment) was set as the softening rate. This softening rate indicates that the smaller the value, the larger the softening effect.

(13) water pressure

A measure of the density and waterproofness of a nonwoven fabric, which is represented by water pressure. The test piece (20 cm square) was extract | collected, and measured according to JIS-L-1092.

[Example 1, Example 2]

An air inhaler using polypropylene containing titanium oxide (MFR = 40 measured under the conditions of Table 1 of JIS-K7210) as a raw material and cooling the long fibers extruded from a nozzle having a round cross section from the side in the vicinity of the nozzle. It was taken out by the traction take-out apparatus of the back. The line of the thread leaving the towing take-off device was opened through the charging device, and then collected as a web on a moving gold mesh conveyor.

Partial thermocompression welding was carried out by passing through the web between the embossed / flat rollers heated at 135 ° C. in a pinpoint pattern (area ratio of about 7%) arranged in a zigzag shape having a circular inclination of 45 ° with a diameter of 0.43 mm and an inclination pitch of 1.5 mm. To obtain a nonwoven fabric having a pinpoint scattered point shape.

The constituent fibers of the obtained spunbonded nonwoven fabric were round cross-section yarns of 2.8 dtex (Example 1) and 2.0 dtex (Example 2), and the partial thermocompression bonding area ratio was 7%, and the basis weight was 20 g / m 2, respectively.

This nonwoven fabric is a honeycomb pattern pattern (sequential intaglio: see Fig. 4) having a continuous line shape of 0.9 mm on one side and a line width of 0.1 mm (pressure area ratio 12.5%, pattern pitch length 2.8 mm, width 3.2 mm, depth 0.7 mm). ) Was passed between the emboss roller (100 ° C.) and the rubber roller having a surface hardness of 50 degrees (JIS-A hardness), and the pattern was pressed at a line pressure of 100 kg / cm. Pressurized periphery was pressed to obtain a high-density area, and a flexible nonwoven fabric with a central portion bulging up was obtained.

0.45 wt% of the nonwoven fabric was provided to the nonwoven fabric by the gravure system and the hydrophilizing agent which consists of an active agent which mainly contains the block copolymer polyether of polypropylene glycol propylene glycol, and polyether modified silicone was made into the nonwoven fabric for sanitary materials. The performance evaluation results of the nonwoven fabric are shown in Table 1 and Table 2.

The disposable diaper produced by placing the low density region (emboss concave surface) of the non-bonded fiber which is the surface of this nonwoven fabric on the skin surface side of the top sheet, and the fiber layer rises between the high density regions rather than the conventional nonwoven fabric. It was a good thing with the touch of the soft and soft nonwoven fabric which was raised and soft and the wet bag characteristic was improved. Example 2 of fine decitex was superior to smoother and softer.

[Example 3, Example 4]

The non-continuously embossed pattern of the non-bonding pressurized embossed pattern that is opposite to Example 1 (0.45 mm on one side, 25% press area area, 2.8 mm on the pattern pitch, 3.2 mm on the width, 0.6 mm in depth) A nonwoven fabric of the present invention having a weight of 2.8 dtex and a basis weight of 20 g / m 2 was obtained in the same manner as in Example 1. The performance evaluation results of the nonwoven fabric are shown in Table 1 and Table 2.

This nonwoven fabric was used as the top sheet, and in Example 3, the continuous convex (surface of the nonwoven fabric) of the low density region of the nonwoven fabric was used as the skin surface side of the topsheet, and the ratio of the high density region on the back surface of the nonwoven fabric opposite to Example 4 was used. The disposable diaper was produced using the continuous convex patterned surface as the skin surface side of the top sheet. In the same manner as in Example 1, the softness was superior to the conventional nonwoven fabric and the wet bag performance was also good. In addition, when the top and back sides of this nonwoven fabric were made into the top sheet (Example 4), the high density area | region rose to the point shape, and it was a touch which added the soft feeling to the surface smoothness.

Example 5

A roller having a lattice concave pattern that fits the pattern with a lattice convex pattern (one side 0.3 mm x 0.7 mm, a pressurized area ratio of 22% and a depth of 0.6 mm) interspersed with non-bonding embossed patterns that are discontinuously; Except having passed through the combination, it carried out similarly to Example 1, and obtained 2.0 dtex and nonwoven fabric of this invention of 18 g / m <2> of basis weights. The performance evaluation results of the nonwoven fabric are shown in Table 1 and Table 2.

The disposable diaper which used the continuous convex surface (surface of a nonwoven fabric) of the low density area | region of this nonwoven fabric toward the skin surface of a top sheet was produced. In the same manner as in Example 1, the softness was superior to the conventional nonwoven fabric, and the wet bag characteristics were also good.

EXAMPLES 6 AND 7

Before imparting a hydrophilizing agent, the corona treatment is performed, and the corona treatment conditions are performed at a discharge amount of 30 W · min / m 2 (discharge conductivity of 2.2 W / cm 2) under an atmosphere of 22 ° C., and as a result, the surface tension of the nonwoven fabric is 37 mN / m. The nonwoven fabric for sanitary materials of the present invention was prepared in the same manner as in Example 1 and Example 3 except that the adhesion of the hydrophilizing agent was adjusted to 0.3 wt% in consideration of the improvement of the wettability by the corona treatment. Example 7 was obtained. Disposable sanitary material using the obtained nonwoven fabric as a top sheet is softer and has less adhesion of the hydrophilizing agent than the conventional nonwoven fabric, but has excellent water permeability as in Examples 1 and 3, and less processing agent. It was a good thing with the touch of a more soft and flexible nonwoven fabric.

[Comparative Examples 1, 2, 3 and 4]

In Examples 1, 2, 5, and 7, non-bonding pressurization was carried out and those to which a hydrophilic agent was applied were used as Comparative Examples 1, 2, 3, and 4, respectively.

[Comparative Examples 5 and 6]

As a comparison of a top sheet, the short fiber point bond nonwoven fabric (19 g / m <2>: comparative example 5) utilized as a top sheet of a commercial diaper. A bicomponent short fiber hot air adhesive nonwoven fabric (18 g / m 2: comparative example 6) was used, and the results are shown in Tables 1 and 2.

From the results shown in Tables 1 and 2, the examples are more sublime, less change in thickness upon loading, more flexible, and more permeable to instantaneous water permeability, wet bag properties, liquid flow, water permeability, and the like. It turns out that it is excellent in performance.

The nonwoven fabric for sanitary materials of the present invention shown in Tables 1 and 2 has good sublime properties, a sublimation ratio of 110% or more, little change in thickness when a load is applied, excellent compressibility to the load, flexibility, and Good water permeability and water permeability durability are shown.

[Example 8, Example 9]

Towing apparatuses such as an air inhaler, using polypropylene (MFR-40 measured under the conditions of Table 1 of JIS-K7210) as a raw material, and cooling the long fiber extruded from a round cross-section nozzle from the side in the vicinity of the nozzle. Was taken. The line of thread exiting the towing take-off device is passed through the charging device and opened, and then collected as a filament web (2.8 dtex (Example 8) and 1.2 dtex (Example 9), 6.5 g / m 2, respectively) on the moving metal conveyor. It was.

Melt blown fiber type web (single 1.8 micrometers) which uses polypropylene (MFR = 700 measured on the conditions of Table 1 of JIS-K7210) on this web as a raw material, and blows a high pressure hot air from the slit of both discharge nozzles. , 1 g / m 2) were laminated. Furthermore, the filament web created in the same manner to the above was laminated and collected to obtain a laminated web (15 g / m 2). This web is passed between the embossed / flat rollers heated at 130 ° C., and an oval pattern having a long diameter of about 0.9 mm, a short diameter of about 0.5 mm, and an area of 0.36 mm 2 is zigzag of approximately 3 mm long and approximately 1.7 mm wide at an inclination of 30 °. It passed between the heated embossing rollers having the pattern of the inclined non-white pattern (compression area ratio of about 15%) arranged in the shape, and was partially thermo-pressure welded to obtain a nonwoven fabric having an elliptic point-shaped scattered point shape (an inclined non-white pattern).

This nonwoven fabric is embossed roller (40 ° C) and surface hardness of 50 degrees (JIS-A) with a continuous linear honeycomb pattern (patterned concave pattern) (12.5% pressure area ratio, 0.7 mm in depth) of 0.9 mm per side and 0.1 mm in line width. It passed between the rubber rollers of hardness), and the pattern was pressurized by the linear pressure of 100 kg / cm. Pressurized periphery was pressed to have a high density region, and a flexible nonwoven fabric with a central portion was formed. The performance evaluation results of the nonwoven fabric are shown in Table 1 and Table 2. The nonwoven fabric having the fineness of the filament web of 1.2 dtex (Example 9) is a softer nonwoven fabric with the smooth texture of the surface fibers being added.

The disposable diaper which produced these nonwoven fabrics as a three-dimensional gathers was soft and favorable with a sense of thickness, compared with the conventional nonwoven fabric which did not give the softening process. Moreover, the disposable diaper which laminated the non-woven fabric with a microporous PE film as a back sheet had softness and the surface strength which were not practically obtained by the laminated nonwoven fabric which did not perform the conventional softening process, and were fully practical. .

[Example 10, Example 11]

In order to obtain a non-binding uneven deformation | transformation, an Example except having made the embossing pattern pressurized into the noncontinuously spreading patten convex pattern (0.45mm of one side, 25% of press area ratios, and 0.6mm in depth) opposite to Example 8 In the same manner as in 8, a nonwoven fabric of the present invention having a basis weight of 15 g / m 2 (Example 10) and 17 g / m 2 (Example 11) was obtained. The performance evaluation results of the nonwoven fabric are shown in Table 3 and Table 4.

The disposable diaper which made this nonwoven fabric three-dimensional gathers was produced. In the same manner as in Example 8, the softness was excellent and the thickness was also better than that of the conventional nonwoven fabric which did not undergo the softening treatment. In addition, the surface of this nonwoven fabric was laminated with a fine porous PE film in the form of a back sheet, in which a dense sense of unbonded fibers was raised in a dot shape, and the feel of adding a crunchy feeling to the smoothness of the surface was good.

Example 12

In order to obtain a non-bonded concave-convex deformation, the embossed pattern to be pressed is made into a lattice convex pattern (0.3 mm x 0.7 mm in one side, 22% pressure area ratio, 0.6 mm in depth) interspersed intermittently, and the lattice recess fitting with this pattern A nonwoven fabric of the present invention having a basis weight of 15 g / m &lt; 2 &gt; was obtained in the same manner as in Example 8 except that it passed between the rollers having a pattern. The performance evaluation results of the nonwoven fabric are shown in Table 3 and Table 4.

This nonwoven fabric was laminated with a fine porous PE film to prepare a disposable diaper as a back sheet. In the same manner as in Example 8, the softness was superior to the conventional nonwoven fabric and the thickness was also good.

Example 13

In order to obtain a non-bonding uneven | corrugated deformation, the embossed pattern to press is made into continuous diagonal convex pattern (line width 0.2mm, space | interval 0.5mm, 29% of press area ratio, depth 0.6mm), and surface hardness 60 degree (JIS-A hardness) The present invention nonwoven fabric having a basis weight of 17 g / m &lt; 2 &gt; was obtained in the same manner as in Example 8 except for passing through the combination with a rubber roller having a thickness of 15 mm. The performance evaluation results of the nonwoven fabric are shown in Table 3 and Table 4.

This nonwoven fabric tended to be bent obliquely, and was a nonwoven fabric excellent in softness and good in thickness compared to the nonwoven fabric before the softening treatment.

Example 14

A filament web (1.8dtex, 6.5 g / m 2) using polypropylene (MFR = 40 measured under the conditions of Table 1 of JIS-K7210) as a raw material polymer as a polypropylene random copolymer (PE 3%, MFR = 35) A nonwoven fabric of the present invention having a basis weight of 15 g / m 2 was obtained in the same manner as in Example 8 except for the use. The performance evaluation results of the nonwoven fabric are shown in Table 3 and Table 4.

This nonwoven fabric had a surface feel that was as smooth as polyethylene, and was excellent in softness and good in thickness compared to the nonwoven fabric before the softening treatment.

Example 15

In Example 8, the basis weight of 15 g / m 2 was obtained in the same manner as in Example 8 except that the filament web layer on one side was formed with a web of 1.2 dtex (3.3 g / m 2) on the outside and 2.8 dtex (3.3 g / m 2) on the inside. The nonwoven fabric of this invention was obtained. The obtained nonwoven fabric was a nonwoven fabric with a sense of thickness in which the surface layer had smoothness.

[Example 16, Example 17]

The raw polymers for the filament webs were polyethylene terephthalate (viscosity ηsp / C = 0.75) and nylon 6 (relative viscosity ηrel = 2.7), and the melt blown fiber polymers were respectively polyethylene terephthalates (viscosity ηsp / C = 0.42) and Nylon 6 (relative viscosity ηrel = 2.3), filament web (2.0 dtex, 8.3 g / m 2), melt blown fiber web (fiber diameter PET = 2.4 μm, 3.4 g / m 2, N6 = 1.6 μm, 3.4 g / m 2, respectively) ), And a weave pattern embossed pattern (0.5 mm square, 15% crimp area ratio) passes between the embossed / flat rollers, the web of polyethylene terephthalate filament is 205 ° C., and the web of nylon 6 filament is 186 degrees. A nonwoven fabric of the present invention having a basis weight of 20 g / m 2 was obtained in the same manner as in Example 8 except for the hot press welding. The performance evaluation results of the nonwoven fabric are shown in Table 3 and Table 4.

Each of these nonwoven fabrics is a nonwoven fabric having excellent softness and good thickness as compared with the nonwoven fabric before the softening treatment, and particularly, the effect of the polyester nonwoven fabric of Example 16 was remarkable.

These nonwoven fabrics were conventional soft nonwoven fabrics that can be used not only for sanitary materials but also for packaging materials, printing materials, and simple garment materials.

Comparative Example 8-14

The nonwoven fabric before the nonbonding uneven | flexible softening process corresponding to Example 8, 9, 11, 14, 15, 16, and 17 was made into Comparative Examples 8, 9, 10, 11, 12, 13, and 14, respectively, 3, Table 4 is shown.

From the results shown in Tables 3 and 4, it can be seen that the examples are superior to those of the comparative examples in sublimation ratio, tensile strength, stress at stretching, and flexibility.

The spunbond nonwoven fabric of the present invention is excellent in sublime properties, flexible and excellent in strength, and is useful as a nonwoven fabric for sanitary materials. In addition, the spunbond nonwoven fabric of the present invention additionally contains a hydrophilizing agent mainly in the region of (B), thereby providing four types of desired performance, sublime, flexible, pitcher, and wet bag as a sanitary material such as a top sheet of a disposable diaper. Satisfy the characteristics at the same time.

Claims (23)

It is a nonwoven fabric composed of a web of thermoplastic filament continuous filaments, and partially embossed convex or convex pattern consisting of a high-density region of non-bonded fibers on both sides of the nonwoven fabric structure and a partial thermocompression-bonding fiber region pattern that integrates through the surface and the back surface of the nonwoven fabric. The sublime ratio, which is independent, is fixed by these patterns, and is expressed as the ratio of the thickness of the nonwoven fabric to the thickness of the nonwoven fabric to the thickness of the nonwoven fabric including the convex embossed surface of the nonwoven fabric. Spunbond nonwoven fabric characterized by the above-mentioned. The spunbond nonwoven fabric of claim 1, wherein the high-density regions of the non-bonded fibers are continuously arranged. The spunbond nonwoven fabric of claim 1 or 2, wherein the high-density regions of the non-bonded fibers are scattered discontinuously. The spunbond nonwoven fabric according to claim 1 or 2, wherein the sublime ratio is 105 to 400%. The spun bond according to claim 1 or 2, wherein the area ratio of the partially thermocompression-bonded fiber region pattern is 5 to 40%, and the area ratio of the concave or convex pattern portion of the high density region of the non-bonded fiber is 5 to 40%. System nonwoven fabric. A nonwoven fabric formed of a composite web formed by laminating at least one layer of thermoplastic synthetic fiber continuous filament webs and at least one layer of melt blown fibers, wherein the partially thermocompression-bonded fiber area pattern and nonwoven fabric are integrated through the surface and the back surface of the nonwoven fabric. An embossed concave or convex pattern composed of high density areas of non-bonded fibers is independently present on both sides of the structure, and the structures of the nonwoven fabric are fixed by these patterns, and the nonwoven fabric includes a surface of the convex emboss pattern of the nonwoven fabric. A spunbond nonwoven fabric, characterized in that the sublime ratio represented by the ratio of the thickness of the nonwoven fabric occupied by the low density region of the nonwoven fabric structure to thickness is 100% or more. 7. The spunbond nonwoven fabric of claim 6, wherein the high-density regions of the unbonded fibers are continuously arranged. The spunbond nonwoven fabric according to claim 6 or 7, wherein the high-density regions of the non-bonded fibers are scattered discontinuously. The spunbond nonwoven fabric of Claim 6 or 7 whose sublimation rate is 105 to 400%. The area ratio of the partial thermocompression bonding fiber area pattern is 5 to 40%, and the area ratio of the concave pattern or convex pattern of the high density area | region of an unbonded fiber is 5 to 40%, The area ratio of Claim 6 or 7 characterized by the above-mentioned. Spunbond nonwoven fabric which is said. It is a nonwoven fabric composed of a web of thermoplastic filament continuous filaments, and partially embossed convex or convex pattern consisting of a high-density region of non-bonded fibers on both sides of the nonwoven fabric structure and a partial thermocompression-bonding fiber region pattern that integrates through the surface and the back surface of the nonwoven fabric. The sublime ratio, which is independent, is fixed by these patterns, and is expressed as the ratio of the thickness of the nonwoven fabric to the thickness of the nonwoven fabric to the thickness of the nonwoven fabric including the convex embossed surface of the nonwoven fabric. The spunbond nonwoven fabric hygiene material, which is 100% or more and is provided with a hydrophilic agent. The spunbond nonwoven sanitary material according to Claim 11, wherein the hydrophilizing agent is mainly contained in the high-density region of the unbonded fibers. The spunbond nonwoven sanitary material according to claim 11 or 12, wherein the sublimation ratio is 105 to 400%. The spun according to claim 11 or 12, wherein the area ratio of the partial thermocompression bonding fiber region pattern is 5 to 40%, and the area ratio of the pattern concave or convex portion of the high density region of the non-bonded fiber is 5 to 40%. Bond-based nonwoven sanitary material. The spunbond nonwoven sanitary material according to claim 11 or 12, wherein the spunbond nonwoven sanitary material is imparted with a hydrophilic agent after performing a corona discharge treatment. A nonwoven fabric formed of a composite web formed by laminating at least one layer of thermoplastic synthetic fiber continuous filament webs and at least one layer of melt blown fibers, wherein the partially hot press-bonded fiber region pattern and the nonwoven structure penetrate between the surface and the back surface of the nonwoven fabric. An embossed concave or convex pattern consisting of a high density area of unbonded fibers is independently present on both sides of the nonwoven fabric, and the structure of the nonwoven fabric is fixed by these patterns, and the thickness of the nonwoven fabric including the surface of the convex embossed pattern of the nonwoven fabric. A spunbond nonwoven sanitary material, characterized in that the sublimation ratio expressed by the ratio of the thickness of the nonwoven fabric occupied by the low density region of the nonwoven fabric structure is 100% or more, and a hydrophilic agent is applied. The spunbond nonwoven sanitary material according to Claim 16, wherein the hydrophilizing agent is mainly contained in the high density region of the unbound fiber. 18. The spunbond nonwoven sanitary material according to claim 16 or 17, wherein the sublimation rate is 105 to 400%. 18. The spun according to claim 16 or 17, wherein the area ratio of the partial thermocompression bonding fiber region pattern is 5 to 40%, and the area ratio of the pattern concave or convex portions of the high density region of the non-bonded fiber is 5 to 40%. Bond-based nonwoven sanitary material. The spunbond nonwoven sanitary material according to claim 16 or 17, wherein in the spunbond nonwoven sanitary material, a hydrophilizing agent is applied after the nonwoven fabric is subjected to corona discharge treatment. 18. The spunbond nonwoven sanitary material of any one of claims 11, 12, 16 and 17 has a concave or convex pattern in the high density region of the nonwoven fiber of the nonwoven fabric as the skin surface of the top sheet. Spunbonded nonwoven disposable hygiene material, characterized in that it is used. 18. The spunbond nonwoven sanitary material according to any one of claims 11, 12, 16 and 17 has a concave or convex pattern in the high density region of the non-bonded fibers of the nonwoven fabric. Disposable sanitary material, characterized in that used as. A disposable sanitary material comprising using the spunbond nonwoven fabric of claim 6 or 7, as a three-dimensional gather and / or a back sheet.

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