TW201120270A - Nonwoven fabric - Google Patents

Abstract

Disclosed is a nonwoven fabric which comprises heat-fusible composite fibers consisting of a first resin component and a second resin component that has a higher melting point than the first resin component, wherein a contact site of the heat-fusible composite fibers is fused to form a fiber-fusion site. The aforesaid nonwoven fabric has a first surface, wherein said heat-fusible composite fibers are fixed in parallel, and a second surface and, in the first surface, the percentage of the number of sites at which fibers are fixed in parallel to the total number of the aforesaid fiber-fusion sites is 5-30%. It is preferred that said percentage in the first surface exceeds the percentage in the second surface.

Description

201120270 VI. Description of the Invention: [Technical Field to Be Invented by the Invention] The present invention relates to a nonwoven fabric using a heat-fusible composite fiber. [Prior Art] A technique is proposed in which a long fiber which is arranged in a direction such as a fiber bundle, which is a non-woven fabric in which fibers are arranged in parallel, is used, and the joint portions of the filaments are intermittently formed. Therefore, the free tongue movement of the filaments is not suppressed, and the inherent softness of the fiber can be reflected in the nonwoven fabric, so that the nonwoven fabric becomes soft and elastic (refer to Patent Document 1). Further, it is also proposed to be as a fiber bundle. A composite non-woven fabric in which the filaments are fixed to a non-woven fabric as a base material to increase the strength and have a concavo-convex structure (see Patent Document 2). In the non-woven fabrics, 'the fibers arranged in one direction are partially fixed', thereby making the fixing portion In the non-woven fabric in which fibers are arranged in parallel in the present invention, it is necessary to form a joint portion of a certain degree of bonding fibers in order to form a non-woven fabric. Since there is no fixed portion between the joint portions, it is difficult to ensure the strength of the non-woven fabric or the operability at the time of manufacture. The front and back of the cloth have the same structure, so that different functions are required to be joined to different sheets, and separate portions are formed between the joints. It is also proposed that, unlike the non-woven fabrics, The size of the gap formed by the fibers and the fibers is controlled by the thickness of the fibers to be used, and the size of the gap is controlled in a progressive order from the one side to the opposite side (see Patent Document 3). However, in the non-woven fabric, the surface of the non-woven fabric The characteristics vary depending on the thickness of the fiber 151521.doc 201120270, so it is difficult to cope with softness or skin feel, etc. Also, there is a technique of forming a convex portion between the crimping portions by using fibers elongated by heat (refer to the patent literature). 4) In this technique, the crimping portion that becomes the concave portion occupies only a small dot-shaped region, so that the convex portion can be effectively formed by the elongation of the fiber, but the elongation direction of the fiber is not restricted, and the original fiber can be maintained. The entangled state forms a fluffy structure. PRIOR ART DOCUMENT Patent Document Patent Document 1: Japanese Patent Laid-Open Publication No. Hei No. Hei. Japanese Patent Application Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. The present invention solves the above problems by providing a non-woven fabric comprising a first resin component and a melting point higher than that of the nonwoven fabric which is different in strength and softness. The heat-fusible composite fiber of the second resin component of the resin component, wherein the heat-fusible composite fiber is in contact with each other to form a fiber fusion portion, and the nonwoven fabric includes the heat-fusible composite fiber in a parallel state. The ratio of the number of the 15152J.doc 201120270 of the first surface and the second surface of the portion to the number of the fiber fusion portions in the first surface of the first surface is 5 to 3 %. [Embodiment] Hereinafter, the present invention will be described based on preferred embodiments and with reference to the drawings. Figure i is a perspective view showing a first embodiment of the nonwoven fabric of the present invention. The nonwoven fabric 10 of the first embodiment has a single layer structure. The nonwoven fabric 10 has a first surface 10a and a second surface 10b. The second surface 10b of the nonwoven fabric 10 is substantially flat, and the first surface 10a has a concave-convex shape having a plurality of convex portions n and concave portions 12. The concave portion includes the crimping portion 15 formed by crimping the constituent fibers of the nonwoven fabric 10 by embossing. The convex portion 11 is located between the concave portions 12. The convex portion is filled with the constituent fibers of the non-woven fabric. Examples of the method of crimping the fibers include embossing with or without heat, ultrasonic embossing, and the like. On the other hand, the fixing of the fibers and the fibers in the portion where the fibers other than the crimping portion 15 are in contact with the fibers is realized by the welding of the fibers to be described later, and is substantially non-woven by the welding. The convex portion 11 and the concave portion 丨2 are alternately arranged in one direction of the non-woven fabric (the direction in the figure). Further, it is alternately arranged in a direction orthogonal to the direction (the direction in the figure i). By arranging the convex portion u and the concave portion 12 in this manner, when the nonwoven fabric 10 is used as a surface sheet in the field of disposable sanitary articles such as disposable diapers or menstrual sanitary napkins, the contact area with the wearer's skin is reduced. Effectively prevent sultry or spotting treatments. This embodiment of the non-woven fabric 1 压 压 压 〗 〗 〖 Press! The IU 5 is a thermocompression-bonded portion formed by hot pressing, and is formed in a lattice shape as shown in Fig. 1. More specifically, the crimping portions τ and Q are formed in parallel with each other and are formed at specific intervals, and the first linear embossing 15 a and the phase 丞 丞 相互 151 151 151 151 151 151 151 151 151 151 151 151 151 151 151 151 151 151 151 151 151 151 151 151 151 151 151 The second embossing 15b. The first embossing 15a and the second linear embossing 15b form an angle of about 15 to 90 degrees and intersect each other. The interval between the first linear embossing i5a and the interval between the second linear ridges 15b is preferably 2 to 20 mm, and more preferably about 3 to 10 mm. The linear embossing may be a continuous linear embossing as in the present embodiment, and the distance between the dots is 5 mm or less, preferably 2 mm or less. A region surrounded by the crimping portion 15 is formed in the nonwoven fabric, and the central portion of each of the partition regions is relatively raised to the convex portion 11 with respect to the crimping portion 15 and the recess portion 2 surrounding the region. The area of each of the divisional regions 22 is preferably 0.25 to 5 cm 2 , and more preferably 0.5 to 3 cm 2 . The constituent fiber of the nonwoven fabric of the present embodiment includes a heat-fusible composite fiber containing a first resin component and a second resin component having a higher melting point than the first resin component. Further, a fiber fusion portion formed by welding a portion where the heat-fusible composite fibers are in contact with each other is formed in a portion other than the crimping portion 15 (see Figs. 4(a) and 4(b)). The non-woven fabric 10 of the present embodiment is a network of fibers including a heat-fusible component (first resin component) and a high-melting component (second resin component) having a higher melting point than the second resin component, such as a core-sheath structure fiber. The fibers which are elongated by heat are disposed in the inside, and when the fibers are in contact with each other by the heat-sealing component to form a fiber-bonding portion, the first surface 1 〇 a and the second surface are formed! 〇b produces a different structure. In other words, in the first surface 10a, a plurality of fibers are arranged in parallel and the parallel state is fixed by the fusion of the welded components. As a result, the distance between the fibers (hereinafter referred to as the distance between fibers) becomes Large, the second surface 10b is a fusion of the parallel state and is mostly limited to the fusion of the fiber intersections. 151521.doc 201120270 The structure of the structure or the fiber contained in the plane (wavy undulation), the distance between the fibers is relatively changed. small. On the other hand, there is no structure having the first surface and the second surface between the first surface 10a and the second surface 10b, or the structure is present in a small amount, so that the interfiber distance is considered to be in the middle of the two. . Such a specific structure is presumed to be formed by the fact that some fibers which are elongated by heat are disposed, and some of the steps of forming the nonwoven fabric from the web are suppressed. In the nonwoven fabric of the present embodiment, before the fibers are stretched by heat, the compressed concave portion (crimped portion 15) is formed in the web used as the raw material by embossing, and the area ratio of the compressed concave portion is 3 It is about ～3〇%, but it is formed in a dotted shape, a dotted line shape, or a continuous line shape, and the surrounding area of about 5 to 5 cm 2 is formed by compressing the concave portion. The bottom surface of the compressed concave portion is formed close to the second surface 10b of the mesh, and the transport support or the like is present on the second surface 1b side, and the ridge is raised toward the second surface 10b side. When the first surface 1 〇 3 side ridge is more suppressed, when the elongation is exhibited by heat, it is considered that the fiber is elongated only in the surrounding region, and is elongated in the three-dimensional direction on the second side, or Folded on a flat surface. As for the shape in which the fibers in the first surface 10a are arranged in parallel, it is conceivable that the length of the fibers is elongated at any position in the thickness direction of the mesh in which the thermally extensible fibers are disposed. When it is released, the three-dimensional activity performed by this is maximized in the first surface 1 〇a, and in this state, the heat-fusible component exhibits weldability at the intersection of the fibers and the resin of the heat-fused component is concentrated. As a result, the fibers themselves are pulled, thereby forming a parallel state from the intersection. On the other hand, in the portion which is the inner surface of the thickness of 15l521.doc in the direction of 201120270 degrees, although the elongation of the fibers and the splicing between the fibers are formed, (4) there are other fibers, so the fibers are not free to move and are limited to Welding near the intersection. The non-woven fabric 10 is a portion where the heat-fusible composite fiber can be fixed in parallel (a portion where the fibers are fixed in a parallel state) [see Fig. 4(a)]. Here, the "parts fixed in the parallel state" means that the cross-angle of the fibers is less than 30°, and the length (4) of the refining portion of the fibers is a portion of the fused portion: twice or more the thickness P1. In such a fiber parallel state, a welded portion which is three times or more the fiber thickness can be formed as compared with a welded portion in which the fiber thickness is about twice as large as the fiber thickness at the intersection of the fibers. Core-sheath construction fibers (core component: polyacetate, sheath component: high-density polyethylene) having a fiber thickness of 3.3 dtexx51 mm, observed in a parallel state using an electron microscope in a range of approximately 2 mm x 1.5 mm The frequency of detection of the part is 5 parts or more in the present invention compared with the case where the normal fiber is used, and more than 8 parts are confirmed in more cases, and the length of parallel fixation (ie, welding) is also compared. The length is 3 to 1 times the fiber thickness, preferably 5 to 10 times (the maximum length is 1 to 2 times the fiber thickness). The ratio (percentage) of the number of the portions in which the fibers are fixed in the parallel state to the number of the fiber fusion portions in the first surface 10a of the nonwoven fabric 10 is 5 to 3 %. When the ratio is 30% or less, the fiber and the fiber are less welded, and the degree of freedom of movement of the fiber is high, so that the softness of the non-woven fabric and the touch of the skin are excellent. On the other hand, when the ratio is 5% or more, the gap between the fibers and the fibers (the distance between the fibers) becomes large as a whole, and therefore it is difficult to cause the structure to occur due to external pressure such as pressure 151521.doc 201120270. In the case of absorbent articles, especially in the use of absorbent articles, the structure of the liquid-absorbent or liquid-permeable properties is considered. The above ratio (the composition of the composition. Since 10~20〇/〇〇〃丰从佳5〜鸠, more preferably, the number of the fiber fusion joints conforms to the "η ^ , iron., and the fixed state of the fiber. The fiber is welded, and does not conform to the fiber. The parallel state is solidified. The fiber fusion portion of the "clamp" is "stretched... Ten. Figure 4 (b) is not in accordance with the portion IU where the fiber is fixed in parallel" (a typical example of the fiber fusion portion) In the first S10a system of the 'non-woven fabrics', the number of the fusion points of the fibers is smaller than that of the second surface 101). Therefore, even if the fibers are fixed in a parallel state (hereinafter referred to as a parallel material portion) The number is (4), and the proportion of the parallel fusion parts is also increased [refer to Figure 4). , ⑻ and FIG. 5 (a), (b)]. From the viewpoint of the degree of influence on the structure of the non-woven fabric, it can be considered that the role of controlling the overall structure is exerted by the higher ratio of the joints, but from the viewpoint of the application of the absorbent article, the entire welded portion is dispersed as a whole. It is preferable to arrange the non-woven fabric as a whole, and it is preferable that the ratio of the parallel welded portion and the number of the parallel welded portions are high. The ratio of the number of the portions of the first surface of the nonwoven fabric 10 that are fixed in the parallel state to the number of the fiber-bonded portions (percentage), and the ratio of the corresponding portion of the second surface 1 Ob is preferably More than 5%, more preferably more than 1%. The ratio of the correspondence of the second surface 1 〇b of the nonwoven fabric 10 is preferably 〇 5%, more preferably 2 to 4%. Further, the multiple (the average length) of the parallel fusion portions in the second surface is preferably 2 to 5 times as large as 151521.doc -9 to 201120270 in terms of the distance between the fibers which can improve the absorption. In addition, FIG. 5 is an electron micrograph showing the fiber fusion portion of the parallel welding portion and the other, and the parallel welding portion is represented by a rectangle having substantially the same length on or near the same, and the fiber is brighter than the parallel fusion portion. The joint is represented by drawing a small circle on it. The first surface has a plurality of portions fixed in a parallel state, whereby the interval between the fibers is enlarged, and a loose space is easily formed. Therefore, the obtained nonwoven fabric is excellent in flexibility or elasticity. The interval between the fibers tends to increase as the number of the portions fixed in the parallel state (indicated by the average length of the parallel-dissolving portions and the total length of the parallel welded portions) increases or the fixed length becomes longer. On the other hand, the total amount of the parallel state in the second surface is less than the length of the first surface or the fusion joint is /, whereby the interval between the fibers is smaller than the first! The surface is thus more than the first side of the fiber. Thereby, in the second surface, it is easy to obtain a structure as the strength of the nonwoven fabric. Further, it is easy to form a fiber having a structure folded in a plane, and thus it is not only more difficult to cause fixation in a parallel state, but also a structure in which a fiber is folded (a structure in which a fiber is bent) is easily present between the intersection portion and the intersection portion, thereby being less likely to be damaged. Softness. Further, the interval between the fibers of the second surface and the second surface is different as described above, whereby the surface of the absorbent article is placed on the skin contact surface side and the second surface is placed on the second surface. The skin is in contact with the side of the face, so that it is easy to form a capillary gradient that easily causes the liquid to move. In the observation of the bonding state of the fibers in the first surface and the second surface, a scanning electron microscope is used to take in an image to determine the degree of fixation of the fibers and the fibers in a parallel state, and to obtain an image '2 mm X1. The number and fixed distance are measured within a range of 5 mm. Fig. 5 is a magnified photograph showing the first surface of the non-woven fabric according to the embodiment of the present invention and the second surface of the non-woven fabric formed by the fibers and the first surface of the nonwoven fabric. The parallel welded portion described above has 10 portions in the first surface of the non-woven fabric according to the embodiment of the present invention [Fig. 5 (a)], and has four portions in the second surface of the same non-woven fabric [Fig. 5 (b) ], in the non-woven fabric formed by the previous fiber, there are three parts [Fig. 5 (c)] 'When the comparison is made with the same area, the above-mentioned parallel welded portion is on the first side compared to the second surface and the previous non-woven fabric More formed in the middle. If they are different areas, they can be converted to the same area for comparison. Further, in the comparison of the non-woven fabrics in which the thickness of the fibers is different, the thickness of the fibers to be the basis is determined and converted into the thickness of the fibers to be used as the reference. (In the present embodiment, the fiber diameter is 25 μηι, and in the comparative embodiment, it is 28 μηι, so the history of 2 5 μηι s is calculated as the reference diameter. Refer to Table 1) and the maximum of the parallel state in the first surface of the present embodiment. The length is 341 μηη, the average length is 16〇, and the total length is 1598 μηι. On the other hand, the maximum length of the parallel state in the second surface and the previous non-woven fabric is as low as ι 34 μηι ‘and the average length and the total length are also lower values. According to the above, even in the case where the prior art or the elongation of the fiber is suppressed, the parallel state formed does not exceed the degree of 丨〇〇μηι, and it is difficult to form a shape exceeding 100 μΐπ, and the maximum length has more than 15 μm. It is preferable to have a maximum value of more than 300 μm, which is considered to be an effect of forming a parallel state. As described above, the difference in the arrangement of the fibers in the first surface and the second surface was observed, and this case was expressed as a difference in the distance between fibers. The measurement of the distance between the fibers can be measured in accordance with the measurement of the diameter of the fibers between the two sheets described in Japanese Patent Laid-Open No. Hei No. Hei No. Hei. For the image for measuring the interfiber distance, it is preferable to use a scanning electron microscope (for example, manufactured by JEOL) as an image analyzing device in terms of the depth of focus or the ease of designation of the gap between the fibers and the fibers. NEXUS manufactures NEWQUBE (Ver.4.20) (through a CCD (charge_c〇upled device) camera or scanner, or directly based on electronic data, etc.) to take in an image and display the size displayed in the electron microscope image (1〇〇μηι in FIGS. 6 and 7) is used for calibration to perform each measurement. Further, the first surface 10a is formed by photographing the surface 1〇a (preferably the central portion of the convex portion 最 which is the farthest from the compressed concave portion) from the direction perpendicular to the surface l〇a. The surface 1 〇b (preferably a portion corresponding to the central portion of the convex portion 11 farthest from the compression concave portion) is taken by an electron microscope from a direction perpendicular to the surface i 〇 b. FIG. 6 and FIG. 7 are taken as an example of an image taken by an electron microscope of the first surface of the surface sheet of the present invention. In the second step, the fifth point of the fusion intersection is performed, and the intersection of the intersection is performed in the second step. In order to linearize the fibers, the thickness and shape of the linear lines are adjusted in the third step, and in the fourth step, the image is analyzed by the image analysis software to calculate the binarization and the distance between the fibers. In addition, Microsoft office power p〇int2003 provided by Microsoft Corporation is used for the labeling and sorting of the intersections and the arrangement of fibers from the image. In the first step, as shown in Fig. 6(a), the fibers are welded to each other by a hollow circle (fiber splicing portion, hereinafter also referred to as "intersection point"). As for the splicing system, the following conditions are used as the criterion for the determination of the fiber at the intersection of the fiber (Fig.) and the thickness of the fiber become coarse, or the fiber at the intersection point loses its shape (the state of the fiber boundary line or fiber is not observed) Impatient deformation, etc.). In order to know the fiber 151521.doc • 12·201120270 dimensional reversal and non-woven structure, it is preferably in the range of 2 mm x 1.5 mm in the non-woven fabric of the fiber having a thickness of about 2 G μηη. Further, when an image obtained by photographing the same field of view from the oblique direction is used, it is possible to confirm the case where the fiber is dispensed, and it is also possible to use it in a complementary manner. In the second step, the marked fusion intersections are classified into A to D, and the measurement for measuring the distance between the fibers is carried out in a manner not shown in Figs. 6(b) to 7(c). In terms of classification, the fusion point of the fiber at the uppermost portion is set as the intersection point A'. At the intersection point A, it is assumed that the fiber of the upper side (the surface side of the first surface) is selected as the fiber A. The assumed fiber A usually has a plurality of weld intersections, so that the weld intersection point on the fiber A is marked as the uppermost fiber when the assumed weld fiber a is more than 80% of the weld intersection = above the weld intersection. Fiber A. In the same procedure, the fiber A as the uppermost fiber and its intersection point a on the measurement screen are selected. In the non-woven fabric having the fiber A, it is surely welded to the other fibers at the intersection A thereof, and the fiber which is not the fiber a which is welded to the fiber A at the intersection A is set as the fiber B, and the fiber B other than the intersection point A is welded. The intersection point is the intersection point B. The fibers other than the fibers A and B in the fibers having the fusion point B at the intersection B are set as the fibers C, and are selected in the same manner as the fibers. The fiber at the uppermost portion is set as the i-th fiber 1A, and is set to be 80% or more of the fusion bonding point in the image, and the fiber is located at the upper portion, and when the ratio of the fusion intersection is above 8% in the above step, The measurement sample did not have the fiber A and the fusion intersection A, the fiber B became the second fiber, and the fiber E became the fourth fiber. ''The upper part of the fusion joint is more than 8〇% above the upper part'" means that when the fiber is in the direction of 151521.doc -13- 201120270, the fiber is in the longitudinal direction of the plurality of fusion intersections (splicing with other fibers) More than 80% of the dots pass above the other fibers. Further, when an image obtained by photographing the same field of view from the oblique direction is used, it is possible to confirm that the fiber intersection is welded, and it is also possible to use it in a complementary manner. The second fiber 1B has at least one weld intersection a. The third fiber 1C is a fiber having no fusion bonding point A and having at least one fusion bonding point B. The fourth fiber 1D does not have a fusion intersection A and a fusion intersection b, and has at least one fiber with the fusion intersection C of the third fiber 1C, and the fifth fiber 1E has no fusion intersection A, B, C and has a fusion intersection. D and e fibers. Even if the fiber extends over the fusion intersection D, it is not the fifth fiber when there is no fusion intersection e [refer to Fig. 7(c)]. The i-th to fifth-fibers 1 a to 1E (or the fourth-fourth fiber) are determined in this manner. The labeling of the fibers and intersections was carried out as follows. As for the fiber, the fiber is used to identify the fiber by using the dotted line of the fiber on the image of the electron microscope. As for the intersection, the unidentified person and the grade are distinguished by setting the interior of the hollow circle to the same color as the fiber, especially 1 The ratio of the intersection of the fibers 1A is more important. Therefore, when the intersection point is above and when it is below, the color of the outer side of the circle is changed to distinguish. As for the fiber and the intersection point identifiable, the dotted line is a solid line and the identification of different fibers. In the measurement of the present embodiment, the first fiber and the intersection point are set to red, and the second fiber and the intersection point are set to blue. The third fiber and intersection are set to pink, the fourth fiber and intersection are set to green, and the fifth fiber and intersection are set to black I5I52I.doc 14 201120270 color 'But in Fig. 6 and Fig. 7, the intersection of the first fibers In the case of 〇, the intersection point of the upper side is set to ·, the intersection of the second fibers is □, the intersection of the third fibers is ◊, the intersection of the fourth fibers is Δ, and the intersection of the fifth fibers is set to X. Further, in order to distinguish the fibers from the intersection, the coarser P is shown to the extent of the fiber thickness. · P°int lines, (8) set to the first! The fiber (the dotted line ^the two points' (4) is the first fiber (solid, line) second fiber broken line, and the (4) is the second fiber (solid line) the third fiber broken line... In the third step, the line is made The coarseness is deformed to correspond to the thickness of the fiber to obtain the mesh shape of the fiber. [See Fig. 8 (a), (b)] The mesh pattern of the obtained fiber is taken in by the image analysis software and processed. (Step 4) The processing sequence is as follows: the fibers are selected by binarization, and then the spatial projection shape formed by the inverted fibers of the binary image is specified, and then the peripheral portions not surrounded by the fibers are removed, and then The area surrounded by the fibers was measured [refer to Fig. 8 (c)]. In the area measurement, in order to remove the minute points as noise, 丨~5 pixels (pixel) were removed in the measurement and the average area was measured. According to the obtained average area, the diameter of the circle when the circle is regarded as a circle is calculated, and the value is set as the distance between the fibers. The fiber in the first surface l〇a or the second surface 10b of the non-woven fabric 10 is Ratio of the number of parts in parallel solidification to the number of fiber fusion joints (Percentage) ' can be obtained from the fusion intersection obtained by the above-mentioned preferred method for measuring the distance between fibers. The intersection angle of the fibers in the intersection point specified by the distance between the fibers of 1 $ is less than 3 〇 and dazzle 1 The intersection of the length of the joint portion exceeding twice the fiber thickness is measured as a parallel fusion portion. The parallel fusion joint at 15 places is shown in a rectangle in FIG. 9 151521.doc 15 201120270 [Fig. 9(a)], including parallel welding The intersection point of the portion is 67 [Fig. 9(b)]. The average interfiber distance of the first surface of the present invention is preferably 1 〇〇 15 15 μm, and the average interfiber distance of the second surface is preferably 60 ^ ^ 20 μπι, the difference between the average interfiber distances from the average interfiber distance of the first surface minus the average interfiber distance of the second surface is 20~70 μηι', especially when 30~50 μηι, the strength of the non-woven fabric It is preferable in terms of the hand feeling brought about by the shape stability. In the case of the non-woven fabric formed by the same hot air method, the difference between the average fiber distances obtained by the hot air method of the first surface and the second surface is smaller than 2〇μηη, and the average fiber distance is also small. Since the distance between the fibers is large, the number of spatial projection areas divided by the fibers is also small. From this aspect, it can be understood that the first surface is a looser structure than the second surface. 〇a

It is preferable that the recessed portion 12a formed on the first surface side is deeper than the concave portion formed on the side of the second surface 1〇b by the top portion (the maximum height portion of the nonwoven fabric of the present invention) as shown in Fig. 3(b). Section 5) Non-woven section I5152l.doc • 16 - 201120270 Large and measured the height dl from the top of the first surface to the surface of the recess, and the height d2 from the top of the second surface to the surface of the recess [refer to Figure 3 ( b)] and measure the recess. An electron microscope can also be used for the measurement, but from the viewpoint of the ease of observation, the VH-3000 microscope is used for amplification by KEYENCE, and the measurement is performed by the two-point measurement method after the calibration setting. The depth di of the concave portion of the first surface is preferably 6 〇 to 99% of the thickness of the non-woven fabric, and the depth d2 of the concave portion of the second surface is preferably 〇 〇 〇 〇 , , , , , , , , , , , , , , , , , , , , , , , , The dl is 0.34.5 mm, and the depth d2 of the concave portion of the second surface is 0 to 0.3 mm, so that it is preferable from the viewpoint of softness and elasticity as the surface sheet # of the absorbent article. Liquidity and low diffusibility, and further liquid migration are preferred. As a raw material of the constituent fibers of the non-woven fabric of the present embodiment, a fiber having a length elongated by heating (hereinafter referred to as a thermally extensible fiber) is used. The heat-expandable fiber is obtained by, for example, changing the crystal state of the resin by heating, and elongating, and the fiber formed by the crimping of the fiber is released, and the fiber having an elongated length in appearance is called The heat-expandable fiber which is particularly preferable in the nonwoven fabric 10 of the present embodiment is preferably a combination of elongation of the resin of the core component under the welding condition of the sheath component, and specifically, the sheath component preferably has a high density and a medium density. Or a combination of linear polyethylene, polypropylene or polyester. Hereinafter, a preferred manufacturing method using the non-woven (four) of the thermally extensible conjugate fiber will be described with reference to Fig. 2 . First, the mesh 20 is formed using a specific mesh forming mechanism (not shown). The mesh 20 is comprised of a thermally extensible composite fiber or is formed by a thermal extensibility 151521 .doc 201120270 = dimension. As a method of forming the web, for example, the following method can be used, etc. (a) a carding method for opening a short fiber using a carding machine; a continuous filament obtained by directly melting a (four) filament of a helium device and stacking The method of the above (spun bonding method); and the method of conveying short fibers by air flow and depositing on the net (air spinning method) 'but the flexibility of the fiber exhibiting elongation and the structure exhibiting elongation In view of the ease of formation, it is preferred to use the carding method of (4), and the length of the fibers to be used is preferably about 25 to 7 inches. The mesh 20 is conveyed to the hot pressing device 21 where it is subjected to hot press processing. The heat pressing device 21 includes a pair of rollers 22, 23. The roller 22 is an engraving roller 123 which is formed with a plurality of convex portions on the circumferential surface thereof, and is substantially a smooth surface, and pressurizes the mesh 2G between the roller and the wand. Each of the views 22, 23 can be heated to a specific temperature. More preferably, the hot press processing is carried out at a temperature higher than the melting point of the fusion component of the low-melting component of the heat-expandable composite fiber in the mesh 2, and at a temperature which does not reach the melting point of the high-melting component. In the hot press processing, the side of the non-woven fabric to be the first surface is the side of the roll 23 having the convex portion, and heat is not applied to the heat-expandable fiber, thereby performing heat at a temperature at which the elongation temperature of the heat-extensible fiber is not reached. Press processing. The heat-expandable composite fiber in the web 2 is crimped by the hot press processing. Thereby, the crimping portion 15' is formed in the mesh 20 in a specific pattern to become the heat-bonded web 24. The thermocompression bonding portion (crimping portion) of the present embodiment is formed as an erecting base point for forming the fibers in the parallel state, and each of the crimping portions is a circle, a triangle, a rectangle, and other polygons having an area of about 0.1 to 3.0 mm 2 . The combination of the shapes of the 151521.doc -18·201120270, or the continuous crimping line of the crimping portion of about 0.1 to 3.0 mm in width, and the curve 'and the entire area of the heat-bonded web 24 are formed regularly and by It is arranged in such a manner as to surround the area surrounded by the thermocompression bonding portion. However, it is necessary to form a region surrounded by the thermally extensible conjugate fiber having a certain degree of unbonded state for forming a three-dimensional shape to form a parallel state of the fiber, and the embossing ratio is 1 to 20%, more preferably It is 2 to 101⁄4, which is preferable in terms of the difference in the structure of the first surface and the second surface which can effectively form the nonwoven fabric. Here, the enclosed region refers to a portion in which the fibers are fixed such that the elongation of the elongated fibers is not dispersed in the planar direction, and it is preferable to form a continuous curve in the alignment direction of the fibers in such a manner as to mask the alignment direction of the fibers. straight line. The state of the cross section of the heat-bonded web 24 is schematically shown in Fig. 30). A plurality of crimping portions 丨5 are formed in the nonwoven fabric 24 by hot press processing. The heat-expandable composite fiber is pressure-bonded to the crimping portion 15 by heat and pressure, or is melt-solidified and welded to the crimping portion ls to form a concave portion on the second surface and the second surface. On the other hand, in the portion other than the crimping portion 15, the thermally extensible composite fiber is in a free state in which no pressure bonding, welding, or the like occurs on the second surface. Further, in Fig. 3 (a) and Fig. 3 (b), the first surface is the upper surface side, and the second surface is the lower surface side. Returning again to Fig. 2, it is preferable that the second surface of the heat-adhesive web 24 is heated or heated to a smooth roll 2 in Fig. 2 to a degree that the elongation state of the extensibility is less. By making the second surface into a weakly stretched state, the mesh structure can be made dense on the second surface, and the surface structures of the first surface and the second surface can be changed. Here, the weakly elongated shape (four) means an elongation of 10 to 5 % by weight when the elongation is fully exhibited, and about 3 to 1 % of the length of the elongated fibril. J51521.doc 19 201120270 Stability per step and non-woven structure In terms of ease of control: good from this point, the surface temperature of the smoothing roller 23 is considered to be a refining component of the fiber, and it is preferably below the melting point. Specifically, Lu Ruo is a polyethylene lene, which is a refining component of the fiber, and has a surface temperature of 6〇~i〇〇t. Further, in the control of the weakly stretched state from the surface side of the second surface, it is preferable to control the time between the smoothing roller η and the smoothing roller. The heat-bonded mesh crucible obtained in the above manner is conveyed to the wind blowing device 26. The hot viscous web 24 is subjected to hot air processing by the hot air blowing device 26. That is, the hot air blowing device 26 is configured such that the hot air heated to a specific temperature passes through the heat-bonded mesh. Further, in view of the improvement of the penetration of the hot air in the mesh and the suppression of the mesh on the mesh surface, it is preferable to use a suction device in combination with the mesh side. The hot air processing is performed at a temperature at which the heat-bonded mesh "in the heat-bonded network" is elongated by the heating, and is present in a portion other than the crimping portion 15 in the heat-retentive mesh. The hot-melt processing is performed at a temperature at which the thermally extensible composite fibers in a free state are in thermal contact with each other. Of course, it is necessary to perform hot air processing at a temperature at which the melting point of the high-melting point component of the heat-expandable composite fiber is not reached. The hot air reinforced composite fiber existing in the portion other than the crimping portion 15 is elongated and crimped and stretched. One part of the heat-expandable fiber is fixed by the crimping portion 15, and thus the crimping portion is elongated. In the hot air processing, since the mesh is loaded on the support 27 such as a metal mesh, it is presumed that the heat-adhesive mesh 24 becomes the support 27 side 151521.doc •20·201120270 In addition to the suppression of the structural change caused by the weakly stretched state described above, the second surface side is also caused by the hot air blowing during the hot air processing, the suppression of the suction, the suppression of the mesh itself, and the like. When the crimping is released, the fibers are difficult to be linear, but are easily formed into a flat surface, so that the fibers are easily brought into contact with each other in a state of being in a state of being weakened. Therefore, if the elongation is caused by a weakly stretched state, the degree of elongation is caused. If it is not very large, it will not become a strong force to disturb the structure of the mesh. The second surface is easy to keep flat. Moreover, the more the crimped portion is formed, the more the fiber is fixed, so the degree of flaws changes. On the other hand, the first surface side of the opposite side of the support body 27 of the heat-adhesive web 24 does not have the same suppression as the second surface side, and the fiber is observed to be elongated in the thickness direction. When the crimping is released into a linear shape, the fibers which are close to the fibers and extend in the same direction are easily concentrated by the melting of the welded components. As a result, it is presumed that the fibers in the first surface are fixed in parallel with the fibers. Therefore, in the first surface, a convex structure which is bulged in the thickness direction is formed, and the fibers and the fibers are fixed in parallel. Therefore, the gap formed by the fibers and the fibers in the second surface is large, and is flat.间隙When the fiber and the fiber are easily crosslinked, the gap between the fiber and the fiber in the second surface is increased. The elongation from the second surface toward the second surface is easy to stretch and curl. The release of the restriction - some of the constraints - therefore, the gap between the fibers and the fibers tends to become smaller. Further, by the formation of the crimping portion, the bulging in the thickness direction as shown in Fig. 3 (b) is more likely to occur. The non-woven fabric 10 is press-bonded to the crimping portion 15 with a heat-expandable composite fiber as a constituent fiber of the nonwoven fabric 1〇15152l.doc -21 - 201120270, and is a portion other than the crimping portion 15, specifically, a convex portion.丨 By the method other than crimping, that is, hot air; the intersection of the thermally extensible composite fibers is joined by heat fusion, and the portion where the fibers and the fibers are fixed in parallel on the work surface side is formed more than the second surface. As a result, the average value and the maximum value of the gap between the fiber and the fiber of the first surface are larger than those of the second surface, so that the non-woven fabric can be used for various purposes. For example, as a sheet for cleaning, in addition to the high collection property of the second surface and the ability to capture the first surface, the adhesion to the object can be improved by the elasticity of the three-dimensional structure or the flexibility of the nonwoven fabric. Sex. In addition, the surface sheet for an absorbent article is excellent in absorbability, that is, when the second side is the front side, the uneven shape causes a decrease in flexibility or contact area, and the first surface faces the second surface. The capillary gradient of the liquid provides good transferability and maintains good contact with the absorbent surface due to the smoothness of the second surface. In the second surface of the non-woven fabric of the lean form of the present invention, the phenomenon that the fibers are folded on the plane due to the elongation of the fibers and the release of the crimp is observed, but the fibers in the vicinity of the crimping portion in the concave portion are not This embarrassing phenomenon occurs. The length which does not exhibit the enthalpy phenomenon is 30 to 130 μm and is 1.2 to 5 times the fiber thickness. It is considered that the reason for forming the structure is that the one end of the fiber is fixed by the crimping portion. Therefore, if the fiber is not detached from the fixed portion, the degree of freedom of the fiber can not be ensured, and the absorbent article is caused by the structure. In the use of the surface sheet, it is difficult to form a structure in which the random gap between the fibers and the fibers is oriented toward (or away from) the pressure-bonding portion, and thus the liquid from the pressure-contact portion of the second surface is likely to be moved. In particular, in the case where the crimping portion is directly in contact with the absorber, the liquid movement effect can be further improved by I51521.doc •22·201120270. From the viewpoint of forming more parallel fusion portions in the first surface 1 〇a from the second surface 1 〇 b, it is preferable to make the portion pressed by the embossing processing easier to the first place. The surface is formed in a state in which the convex portion is formed on one side. The assumption that the convex portion is more easily formed is as follows: a roll having a soft peripheral surface such as a cotton roll is used as the roll 23, or a suction-surface self-pressing device is transported from the second surface 1b side to the hot air blowing device. The object 24 is subjected to hot air treatment or the like while maintaining the suction state after the embossing. Fig. 1A is a view showing the arrangement of the fibers of the second surface (4) the fibers of the second surface and the angle of the second surface of (8) the fibers in the crucible state of the fibers introduced from the fusion joints introduced in Figs. 5 to 8. The diameter of the circle is _ (four) (four times the thickness of the fiber). When the center of the circle is placed at the top of the (four) part, the angle from the intersection of the top connecting circle and the fiber is set as the angle formed by the f-curve of the fiber. This angle indicates that the scorpion and the sickle are below 1 。. The fiber of the second surface is in the measurement range: there are five or more fibers formed by the angle of the f-curve, and the first surface of the 〇(4), and (4) the nonwoven fabric of the normal fiber is not formed in plural. Further, in the crimping portion of the prior non-woven fabric, a plurality of random gaps are formed by concentrating the fibers in the crucible. However, the structure of the non-woven fabric of the present invention is easily used in the thickness to become a fiber self-crimping portion. In the direction of fiber separation, 盥筮2® is equally difficult (four) to form fibers and to maintain liquid structure. , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Configuration or I: 151521.doc -23· 201120270's curling 'causes almost I law to take up the community... 沄 forming adjacent fibers in parallel with each other over a longer distance. Made up of == di-length composite fibers or ... ° 'fiber formers. In the case where the nonwoven fabric is composed of a heat-extensible fiber, the other fibers contained in the nonwoven fabric include thermoplastics having a melting point having a higher thermal elongation temperature than the heat-expandable composite fiber. + City 仏 tree knows the fiber. The other fibers are preferably contained in the nonwoven fabric 10 in an amount of 5 to 50 parts by weight per ft. More preferably, it contains 2 to 30% by weight. On the other hand, the 'thermal elongation composite 缱维# 丁 44b 士 fiber, 隹 不 in the non-woven fabric 1 较佳 preferably contains 50 to 95% by weight, especially preferably contains 7〇~95. / 丄 丄 丄 心 心 〇 〇 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷 廷) formed of a thermally extensible composite fiber. The details of the heat-expandable composite fiber will be described. The (four) long-twisted fiber is a core-shaped composite fiber, and preferably has a core structure and a cross-sectional structure in which the center of gravity and the center of gravity are substantially the same. The heat-generating composite fiber used in the present embodiment is unwound as the fiber is stretched as it is elongated, so that the fiber for obtaining the non-woven fabric of the above configuration is preferable, and the reason is that the core structure and the sheath are right. When the center of gravity of the structure deviates from the eccentric fiber or the side-by-side type fiber, it is easy to exhibit curling due to the fiber itself when the hurricane is used to form a non-woven fabric. Heat-extensible composite fiber in the age of flute] 妓 + #八第一第一树月 a into the knife's melting point or softening point high 10 C temperature elongation Kang * ΛΛ - A long drought is 0.5~20%, especially 3~ When it is 1% by weight, it is preferable from the viewpoint of obtaining a non-woven fabric having a remarkable uneven shape. 15I521.doc -24· 201120270 In order to obtain the heat-expandable composite fiber having the thermal elongation, after the heat-expandable composite fiber is spun as follows, the composite fiber is heat-treated or crimped and not It can be extended. Furthermore, the reason for the above-mentioned measurement of the thermal elongation is that when the non-woven fabric is produced by thermally melting the intersection of the fibers, 35 is usually above the melting point or softening point of the second resin component and is higher than the temperatures. Manufactured within the range of the left and right temperatures. The thermal elongation was measured by the following method. The thermomechanical analysis device TMA-50 (manufactured by Shimadzu Corporation) was installed in parallel with the distance between the chucks. The fiber was heated at a temperature increase rate of 10 C /min under a load of 〇·〇25 mN/tex. The change in elongation of the fiber at this time was measured, and the elongation at a temperature higher than the melting point or softening point of the second resin component was measured, and the elongation was defined as the thermal elongation. The conditions for addition and subtraction after spinning can be selected according to the types of the first and second resin components constituting the retanning fibers of the present invention. For example, in the case where the conjugate fiber of the present invention is of a core type and the core component is polypropylene baking and the component is high density polyethylene, the heating temperature is 5 () to 12 generations, particularly 70 to 1 Torr. (: Preferably, the heating time is 1 〇 to 5 〇〇 seconds, particularly preferably 20 to 200 seconds. Examples of the heating method include blowing hot air, irradiating infrared rays, etc. As a crimping process after spinning, It is relatively simple to perform the mechanical crimping of the two-dimensional and three-dimensional shapes. In the present invention, when the three-dimensional apparent crimping observed in the #@ type core-sheath type composite fiber or the side-by-side type composite fiber is used, The blending amount is preferably 2% or less. The mechanical crimping is sometimes 15152 丨.doc -25- 201120270 with heat. In this case, heat treatment and crimping treatment are simultaneously performed. The fiber will be slightly stretched, but the stretching is not included in the elongation treatment of the present invention. The extension treatment in the present invention refers to an extension operation of about 2 to 6 times the stretching ratio of the undrawn yarn. The heat-expandable conjugate fiber is preferably a core-type of the same core type described above. In this case, the first resin component constitutes a core and the second resin component constitutes a sheath, so that the heat of the heat-expandable composite fiber can be improved. In terms of elongation Preferably, the type of the first resin component and the second resin component is not particularly limited as long as it is a resin having the ability to form fibers. In particular, the difference in the melting point of the two-tree lunar component or the brightening of the first resin component The difference from the softening point of the second resin component is 1 (TC or more 'is particularly 20. (In the above, it is preferable from the viewpoint that the nonwoven fabric can be easily produced by heat welding. The heat-expandable composite fiber is In the case of a core-sheath type, a resin having a melting point of a core component higher than a melting point or a softening point of a sheath component is used. As a preferable combination of the second resin component and the second resin component, the i-th resin component is set as a poly Examples of the second resin component in the case of propylene (pp, polypropylene) include high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), ethylene propylene copolymer, and polyphenylene. In the case of using a polyester resin such as polyethylene terephthalate (PET) or polybutylene terephthalate (PBT) as the i-th resin component, the second component is used as the second component. In addition to the above second resin component, The polypropylene (pp), the copolymerization, the poly 8 fluorene, etc., and the like, as the first resin formation and the like, may be a copolymer or a mixture of two or more of the polyamine polymer or the first resin component. 151521.doc • 26 - 201120270 The article 'also referred to as the second resin component' may be a copolymer or a mixture of two or more of the above-mentioned second resin components. These may be combined as appropriate. It is preferred to use polypropylene (pp)/high-density polyethylene (HDPE) because the difference in melting point between the two resin components is in the range of 2 〇 to 4 〇〇 c. Therefore, the nonwoven fabric can be easily produced. With a lower specific gravity, it is possible to obtain a lightweight and cost-effective non-woven fabric that can be incinerated with low heat. A differential scanning type thermal analyzer DSC_5 (manufactured by Shimadzu Corporation) was used at a heating rate of 1 Torr. (: /min thermally analyzes the finely divided fiber sample (sample mass 2 mg)'. The peak temperature of the refining of each resin is measured, and the second resin component and the second resin component are defined by the peak temperature of the refining. When the melting point of the second resin component cannot be clearly measured by the method, the second resin component is fused to the extent of the weld point strength of the measurable fiber as the temperature at which the molecules of the second resin component start to flow. The temperature is set to a softening point. The ratio (weight ratio) of the second resin component to the second resin component in the conjugate fiber of the present invention is 10: 90 to 90: 10, particularly preferably 30: 70 to 70: 30. In this range, the mechanical properties of the fiber become sufficient, and the fiber becomes a durable fiber. The amount of the X-smelting is sufficient, so that the fibers are sufficiently spliced to each other. The appropriate value can be selected according to the specific use of the composite fiber. As a general range of 10 to 10 dtex, especially U~8·〇dtex', the spinning property or cost of the fiber, the card pass, the productivity, the cost Equal The thickness of the composite fiber in the case of the sheet material is 151521.doc -27- 201120270. The thickness of the composite fiber in the case of the sheet material is 0.1 dtex or more from the viewpoint of the formation of the fusion joint, in particular ( 5 dtex or more is preferably 1 〇 dtex or less, especially 8 dtex or less from the viewpoint of a water absorbing mechanism using a capillary gradient. Next, a second embodiment of the present invention will be described. The form of the region completely surrounded by the thermocompression-bonding portion formed in the non-woven fabric is reduced, the hot air temperature is lowered during the production, the hot air treatment time is prolonged, and the hot air treatment property of the suction device is increased from the mesh surface side, and the first embodiment is the same as the first embodiment. The same is shown. / Figure η (4) and (b) show the electron micrographs of the i-plane and the second surface of the obtained non-woven fabric (photographs in which a plurality of photographs are combined). The same measurement method is used for the same area as in Fig. 5. As a result of the conversion, the number of parallel states in the i-th surface is 8 and the maximum length is 485 μηι, the average length is 2〇〇μΐΏ, and any parallel state is more than 94 μηι. The length of the second surface can also be confirmed. As a configuration for promoting the characteristic structure of the i-th surface and the second surface, there is no thermal extensibility between the second surface of the body surface. The crimped fiber layer of the crimping type can easily express the formation of the i-th surface and the structure and system of the second surface. In addition, the core type composite fiber is disposed on the second surface by the eccentric type. Or the side-by-side type composite fiber, when the three-dimensionally obscured entangled conjugate fiber is used as the surface sheet of the absorbent article, the liquid permeability, particularly the passability of the highly viscous substance, Excellent retention. Further, the advantages of the three-dimensionally apparently creped body in the prior non-woven fabric, but the ease of pilling or the strength of the non-woven fabric having the fluffy woven fabric are 151521.doc -28·201120270 Difficulties, By setting the second side to the skin side, it is possible to sufficiently exhibit the performance as a surface sheet and to form a structure which does not impair the above advantages. The non-woven fabric of the present target form can be applied to various fields in which the uneven shape, bulkiness, and high strength are utilized. For example, it can be preferably used for a surface sheet of a disposable diaper or a disposable sanitary article such as a cotton or the like, a second sheet (a sheet disposed between the surface sheet and the absorbent body), and a back surface. Sheets, leak-proof sheets, or dry wipe sheets for humans, sheets for skin care, rags for use, and the like. When 2 is used for the above use, the basis weight of the nonwoven fabric of the present invention is 15 to 6 g/m2, particularly preferably 2 to 4 g/m2. Further, the thickness is 丨5 to 5 claws, particularly preferably 2 to 4 mm. However, the appropriate thickness will vary depending on the application, and will be appropriately adjusted according to the purpose. The nonwoven fabric of the present invention can be preferably used as a surface sheet of an absorbent article. Absorbent articles are mainly used to absorb body fluids such as urine or menstrual blood. The absorbent article contains, for example, disposable diapers, menstrual sanitary napkins, incontinence guards, and the like, but is not limited thereto, and can widely include articles for absorbing body fluids discharged from the human body. The absorbent article is typically an absorbent sheet comprising a topsheet, a backsheet, and a liquid retaining property disposed between the two sheets. The absorbent article usually has a skin contact surface that comes into contact with the skin of the wearer when worn, and a non-skin contact that faces the opposite side (usually a garment side such as shorts). The material is placed on the skin contact side, and the back sheet is disposed. On the non-skin contact side. When the non-woven fabric of the present invention is used as a surface sheet, the first surface side is used toward the skin side of the wearer, so that the amount of liquid storage is reduced by 151521. doc • 29· 201120270 dry feeling or softness, etc. The consideration is better. As the absorbent body and the back sheet, materials which are generally used in the field of the art can be used without particular limitation. For example, as the absorbent body, a fiber (tetra) composite comprising a fibrous material such as pulp fibers or a laminate in which an absorbent polymer is held therein may be covered with a thin paper or a non-woven fabric. As the back sheet, a film of a thermoplastic resin or a liquid-impermeable or water-repellent sheet # such as a laminate of the film and the nonwoven fabric can be used. The f-side sheet may also have water vapor permeability. The absorbent article can also have various components corresponding to the particular use of the absorbent article. This component is well known to those skilled in the art. For example, when the absorbent article is applied to a disposable diaper or a menstrual sanitary napkin, one or two or more pairs of three-dimensional protection may be disposed on the left and right sides of the surface sheet. The present invention has been described above based on the preferred embodiments, but the present invention is not limited to the above embodiments. For example, in the above embodiment, the crimping portion 15 is formed by hot pressing using embossing with heat. Alternatively, the crimping may be performed without embossing or ultrasonic embossing. unit. Alternatively, the crimping portion may be formed by an adhesive. EXAMPLES (Example 1) A heat-stretching core-type composite fiber having a sheath of polyethylene (PE) and a core of polypropylene (PP) (having a fiber thickness of 4 dtex before elongation) was used by a carding method. And a mesh is formed. The web is subjected to hot press processing to form a lattice-shaped crimping portion 15 in which the first linear embossing 15a and the second linear embossing i5b intersect at an angle of 65 degrees. The line width of each of the first and second linear embossments 15a and 15b is 151521.doc • 30- 201120270 〇·5 mm 'The first linear embossing 1 5a and the second linear embossing 15b are mutually The interval is set to 6 mm. The area surrounded by the crimping portion 15 has an area of 735.735 cm2. The nonwoven fabric of Example 1 was obtained by subjecting the obtained hot-pressed web to a hot air blowing treatment by a hot air blowing device. In the hot air treatment, the treatment temperature (=temperature in the hot air treatment device) was 13 8 ° C, and the treatment time was leap seconds. Further, it is not intentionally attracted from the opposite side (the mesh side) on the side where the hot air is blown. (Example 2) The treatment temperature of the hot air treatment was set to 13 5 , and the treatment time was set to 24 seconds, and the hot air treatment was performed while sucking on the opposite side (the mesh side) from the side where the hot air was blown, in addition to the above. The nonwoven fabric of Example 2 was obtained in the same manner as in Example 1. (Comparative Example 1) A core-sheath type composite fiber (non-thermal extensibility 'fiber thickness: 3.3 dtex) having a polyethylene (PE) and a core of polypropylene (PP) was used, and a mesh was formed by a carding method. In the same manner as in Example 1, except for the first embodiment, the nonwoven fabric of Comparative Example 1 was obtained, and the nonwoven fabric of Comparative Examples 1 and 2 and Comparative Example 1 was obtained, and the first surface and the second surface of the second surface were measured. The number of fibers, the number of welded joints, and the number of the welded portions (referred to as "parallel portions" in Table 1) are shown in Table 1. 151521.doc •31 · 201120270 Minimum length of parallel part Mm ο ON ON ι Maximum length of parallel part μιη κη 00 inch <N 00 I Average length of parallel part μιη § ON ο (Ν m OO 1 1 14.9% 1 3.1 % 1 13.4% 1 2. 5% 2.3% 0.0% Number of parallel parts (area conversion) Ψ 00 00 m Ψ 并行 Number of parallel parts 寸 00 00 Number of welded joints (area conversion) φ Ψ ψ Φ o cn V—Η OO Cn <N m cn y—^ SS 1st Bully nn ν〇cn o $ ON 〇\ 〇1 1st face 1 2nd face (mesh face) 1 1st face 1 2nd face (mesh face) 丨第ι面1 2nd face (mesh face) Example 1 Example 2 Comparative example 1 Fiber diameter coefficient »—Η 丨 1.12 1 1.12 Area factor rH <N (N (N (N (N (N (N (N) (N 2 mmxl. 5 mm 3 mm><2.25 mm 3 mm x2.25mm 2 mmxl.5mm 2 mmxl.5 mm ^ € ft φί Υ pole ε 4Φ m伶in 〇t < parallel part multiple (maximum length) 1 13.6 1 inch in 1 19.4 | vn ON <N 1 parallel part multiple (average length) inch vd ON rn o 00 — 00 01 1 fiber thickness μιη (N in (N CN CN 00 CN 00 CN but (4) $ € ^ this town Η β 黎', 班1 命Η _ History: 缂ψ Ψ 1454 307 208 〇 Parallel section total length μιη 1598 | 387 | 3198 | 676 mm CN o 1st face 1 2nd face (mesh face) 1st face 1 2 faces (mesh face) 1st face 2nd face (mesh face) Example 1 Example 2 Comparative Example 1 151521.doc -32- 201120270 (liquid storage evaluation) Non-woven fabric sheets of Examples 1, 2 and Comparative Example 2 The material was cut into a size of 1 50×70 mm to obtain a surface sheet. The 200 g/m 2 pulp was cut into a sheet of 150×70 mm in a state of 16 g/m 2 of absorbent paper disposed above the pulp. The object is used as an absorber. As an evaluation tool, an injection hole of 10 mm in the center of an acrylic plate of 200 x 100 mm and a thickness of 8 mm is used, and an inner diameter for temporarily storing the liquid and passing the liquid through the injection hole 23 A cylinder of mm and a height of 50 mm (inclination of an angle of 30 degrees between the injection hole) is used as the evaluation liquid, and the horse's fiber blood obtained from the BIOTEST research institute (the viscosity is about 7 Cp). 'Measurement by manufacturing VISCOMETER TVB-10M using τOKISANGYO Co. LTD.). The evaluation surface was prepared by laminating the second surface (mesh surface) side of the surface sheet having the weight before the evaluation to the absorber side. By evaluating the instrument and the weight-adjusting weighing device, the evaluation instrument is stacked on the evaluation sample in a manner of 3 g/cm2 load. 3 g using a beaker or the like

Compared with non-woven fabrics, the amount of liquid storage is greatly reduced. Industrial availability

According to the present invention, 5] 52].d〇c -33 - 201120270 body, thereby maintaining the strength as a non-woven fabric and having a good softness. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a part of a nonwoven fabric which is not an embodiment of the present invention. Fig. 2 is a schematic view showing a method of manufacturing the nonwoven fabric shown in Fig. 1. 3 is a schematic view showing a state of the non-woven fabric shown in FIG. 1 and a manufacturing process thereof, and FIG. 3(a) is a cross-sectional view showing a state before hot pressing and hot air treatment, and FIG. 3(b) is a cross-sectional view showing a non-woven fabric. . Fig. 4(a) is an electron micrograph showing a portion where the fibers are fixed in parallel (parallel welded portion), and Fig. 4 (1>) shows an electron micrograph of the fiber welded portion other than the parallel welded portion. 5 is an electron micrograph showing a portion welded in a parallel state, FIG. 5(a) is a photograph of a first side of the nonwoven fabric of the present invention, and FIG. 5(b) is a photograph of a second side of the nonwoven fabric of the present invention. 5(c) is a photograph of the first side of the previous non-woven fabric. Fig. 6 is an electron micrograph of the first surface of the non-woven fabric of the present invention. Fig. 6(a) is a view showing a fusion point where the fibers are welded to each other, and Fig. 6(b) is a diagram of the first fiber and the intersection thereof. Figure 6(c) is a diagram of the second fiber and its intersection. Fig. 7 is an electron micrograph of the first surface of the non-woven fabric of the present invention. Fig. 7(a) is a view showing a third fiber and an intersection thereof, and Fig. 7(b) is a fourth fiber and an intersection thereof. Fig. 7(c) is a diagram of the fifth fiber. Fig. 8 is a view showing a method of measuring the distance between fibers, and Fig. 8(a) shows that the line of the fifth to fifth fibers of 151521.doc -34·201120270, Fig. 7(c) is adjusted to the fiber thickness. The state diagram 'Fig. 8(b) is a diagram of the fiber after the thickness adjustment, and Fig. 8(c) is a diagram showing the area surrounded by the fibers. Fig. 9(a) shows a parallel welding portion, and Fig. 9(b) shows a method of counting the welding points. Figure 1 is a view showing the fibers passing through the intersection of the fibers forming the sawtooth structure. Figure 1 (a) is a photograph of the second surface of the nonwoven fabric of the present invention, and Figure 1 (b) is the first nonwoven fabric of the present invention. FIG. 10(c) is a view of the fiber taken from the photograph of the first surface of the non-woven fabric of the present invention, and FIG. 10(d) is the third surface of the prior non-woven fabric. A picture of the fiber taken from the photo. Furthermore, the 'sawtooth structure is indicated by thick lines. Fig. 11 is an electron micrograph showing another embodiment of the present invention, Fig. 11(a) is a photograph of the first surface of the nonwoven fabric, and Fig. u(b) is a photograph of the second surface of the nonwoven fabric. [Main component code description] 10 Non-woven fabric 10a First surface 10b Second surface 11 convex portion 12 Concave portion 12a First surface 10a side concave portion 12b Second surface 1 Ob side concave portion 15 Crimp portion 15a First linear embossing 151521.doc •35· 201120270 15b 2nd line embossing 20 mesh 21 hot pressing device 22 ' 23 roll 24 hot sticky mesh 26 hot air blowing device 27 support body 28 hot air dl from the top of the first side The height d2 from the top of the second surface to the surface of the concave portion is the length of the welded portion of the LI fiber. The thickness of the welded portion is X, Y direction 151521.doc • 36-

Claims (1)

201120270 VII. Patent Application Range: 1. A non-woven fabric comprising a heat-fusible composite fiber comprising a first resin component and a second resin component having a melting point higher than that of the first component, and the heat-fusible composite fiber a portion in contact with each other to form a fiber fusion portion; the nonwoven fabric includes an i-th surface and a second surface having a portion where the heat-fusible composite fiber is fixed in a parallel state, and the fiber in the second surface is fixed in a parallel state in the north portion The ratio (percentage) of the number to the number of the fiber fusion portions is 5 to 30%. 2. The non-woven fabric of claim 1, wherein the ratio (percentage) of the first side is larger than the second side. 3. For example, the non-woven fabric of the item: wherein the basis weight of the non-woven fabric is 2〇~_g/m, and the distance between the fibers of the third surface is larger than the second surface. 4. If requested! In the non-woven fabric, the non-woven fabric has a concave portion on the & surface and/or the second surface, and a crimping portion in which the fibers are welded by embossing is formed in the concave portion. 5. The non-woven fabric of claim 4, wherein the concave portion of the first surface of the non-woven fabric and the concave portion of the second surface are formed at the same planar position, and the concave portion of the first surface is deeper than the concave portion of the second surface. 6. The non-woven fabric of claim 1, wherein the non-woven fabric is formed of a single layer. 7. If the non-woven fabric of claim 1 is used, the thermostable composite fiber on the basin is also a composite fiber which is not subjected to elongation treatment after spinning. 8. A surface sheet for use in an absorbent article, wherein the first side of the non-woven fabric of claim 1 is used for the skin contact side. J51521.doc