TWI363819B - - Google Patents

Description

1363819 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a nonwoven fabric and a method of manufacturing the same. [Prior Art] In the case of judging the touch of the non-woven fabric, it is usually used to hold the non-woven fabric, or to apply a light pull, or a touch, or a curved relationship to the deformation of the non-woven fabric, such as stretching, folding, bending, and the like. The skin touch that is not woven is judged by various viewpoints.

The surface smoothness of one of the judgment elements of the non-woven fabric is based on the purpose of improving the characteristics. It has been proposed to have a two-layer structure and to use fibers which are finer than the fibers contained in the lower layer as the fibers contained in the upper layer. Non-woven fabric (refer to Japanese Laid-Open Patent Publication No. 55-158367), the non-woven fabric has an upper layer and a lower layer which are mainly composed of a hydrophobic fiber, and the upper screen is a chemically bonded film having a smooth surface and a finer density than the lower fineness. (chemical bonded) Non-woven fabric. In the non-woven fabric, a binder is used to bond the intersections of the fibers. As a result, the nonwoven fabric lacks the flexibility or drape property of the cloth, and has a sticky feeling peculiar to the adhesive. Therefore, the comprehensive skin touch of this non-woven fabric can be said to be unsatisfactory. (The problem to be solved by the invention) Further, based on the purpose of improving the smoothness of the surface, it has been proposed to suppress the surface sheet of the absorbent article which is raised on the surface (refer to曰本特开开开 2〇〇3_ 235896 and Japan Unexamined 2003-26552 No. 8 bulletin. In Japan, special open 2003-235896 In the publication, the laminate is heated to ι 2 〇 〜 13 〇. (: the heated roller pair is formed into a short fiber web, and the surface of the short fiber protruding from the surface of 108774.doc 1363819 The surface layer obtained by the 浼 仃 仃 仃 仃 仃 仃 仃 仃 得 得 表面 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得 获得In Japanese Laid-Open Patent Publication No. 2003-265528, the non-woven fabric is lost between the two rollers (10) and (4) or the roller is rolled on the surface of the non-woven fabric to press the raised fibers to the surface of the non-woven fabric. The fluffing of the non-woven fabric surface is suppressed to the skin. ^ In terms of improvement, it is quite important. But 'only inhibits hair raising, comprehensively, can't

It is said that it can improve the touch of the skin. The other is due to the soft elasticity of the other. SUMMARY OF THE INVENTION The nonwoven fabric provided by the present invention has a second layer containing one surface and a second layer containing the other surface. The density of the second layer is lower than the density of the second layer and is determined by a through-air method. Non-woven fabric produced; at least the cross-section of the fibers contained in the first layer is flat. The long-axis direction of the cross-section of the fiber is oriented substantially in the plane direction of the non-woven fabric;

The average deviation SMD of the surface roughness of the surface on the first layer side is 25 μm or less and the average deviation MMD of the friction coefficient is less than 0.008; the linear Lc of the compression characteristics of the non-woven fabric is below 〇3 and the bending rigidity B is 0.0 3 cN · cm 2 /cm below. Moreover, the absorbent article according to the present invention includes the nonwoven fabric, and the first layer side surface of the nonwoven fabric is disposed so as to be in contact with the absorbent article of the user's skin, and the first layer has a basis weight of 5 to 15 g/m2, the weight per unit area of the second layer is 5 to 45 g/m2, and the weight per unit area of the non-woven fabric is 10 to 50 g/m2. 108774.doc 1363819 The manufacturing method of the non-woven fabric is to apply calendering by the gas permeable method. (calender) The non-woven fabric is processed in a plurality of stages, and the calendering process is carried out in a plurality of stages. The calendering processing of the bean and the gossip is carried out under the condition of the chamber/dish, and the wire MW is used, and the metal rolling drum and the D hardness (10) Κ 6253 are used. 1 degree resin roller implementer.

In addition, the non-woven fabric processing method provided by the present invention is a non-woven fabric I obtained by a gas permeable method, and has a linear pressure of 20 to 200 N/cm at room temperature, a rolling drum made of metal and a D hardness (10) κ 625 ”. (10) The resin roller of the degree is subjected to calendering, and the fiber contained in the nonwoven fabric is flatly deformed, and the longitudinal direction of the cross section of the flatly deformed fiber is substantially oriented in the plane direction of the nonwoven fabric. 】

Further, the nonwoven fabric obtained by the present invention and the method for producing the same are described below. Hereinafter, the present invention will be described based on an ideal embodiment. The nonwoven fabric of the present invention is produced by a gas permeable method. In the air permeable method, a fiber web such as a carded web is placed on a net and a drum, and a hot air is used to thermally fuse the intersection of the constituent fibers to form a non-woven fabric. When the gas permeable method is used, the non-woven fabric which is good in texture can be obtained with good productivity compared with the case where the non-woven fabric is produced by using other manufacturing methods, for example, chemical bonding as described in the prior art. The non-woven fabric has a non-woven fabric of a first layer of one surface and a multilayer structure of a second layer containing the other surface. The multilayer structure is not limited to two layers, and a structure in which three or more layers of one or more layers are interposed between the first layer and the first layer may be sandwiched. The non-woven fabric of the present invention has the main judgment elements of the skin touch (A) flat 108774.doc The characteristics of the softness (b) and the elastic feeling of (c). Combining these three characteristics The non-woven fabric of the present invention has a very good skin feel. Weaving = Describe the smoothness of the non-woven fabric. The smoothness is the characteristic of the present invention which is not mainly represented by the layer of the layer. The woven fabric of the layer is provided with a flatness ratio which is one of the smoothness of the non-woven fabric. "Length" is 1.2 or more, especially U or more; ^ flat shape n The fiber layer contained in the first layer is flat on both sides of the entire length, but is not limited thereto, as long as 70% of the total length The level 2 is 8 % or more and the cross section is flat. It is possible to give the desired enthalpy. In particular, it is preferable that the portion between the fibers is flattened in a flat shape. In the present invention, As described later, it is preferable that under the special conditions, # is deformed by the original cloth of the non-woven fabric. %叩原f is subjected to calendering processing to make the fiber flat and the fiber of the Λ Λ (4) ^ all of them are ^ The silk is more reasonable and pseudo-inducing. The longitudinal scraping surface of the first layer is enlarged by an electron microscope: when the cross section of the fiber is observed, the desired shape is smoothed by using the two fibers as a flat shape. As a flat fiber in the cross section, the flat section of the cross section is made of a special joint. The cloth is made of (1), ', and the cross section of the 3° is not flat, but it is processed into a flat fiber after being woven. It is preferable to use the latter in the non-woven fabric of the present invention. ::::: cloth smoothness, the first cross section of the first layer is flat, and the long axis direction of the '(4) plane is oriented substantially to the plane of the non-woven fabric. i08774.doc U0J819 The direction is also very important. The angle of the direction of the fiber surface is formed. When it is too large: It is difficult:: The direction of the axis and the non-woven fabric are flat, the closer to the surface of the second layer: and:: The near-cutting touch. From the perspective of the long axis, it is best to have the fiber of the cross. In the face of the j, he looks to the direction of the non-woven field, which refers to the longitudinal direction of the first layer. The so-called roughly defined fiber... The electron microscope magnifies and looks at the long axis direction of the flat fiber, based on the count觐 扁 + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + In the non-woven direction, as described later, after the non-woven fabric manufacturing It is simpler to process the flat axis, and the long axis of the cross section is oriented in the plane direction of the non-woven fabric. Therefore, it is preferable that the fiber of the third layer is fine fineness from the viewpoint of imparting better smoothness to the non-woven fabric. The fiber is finer than the fiber of the first layer. From this point of view, the fiber contained in the i-th layer is preferably OHO dtex, especially QW 5 dtex. The denier is measured by the following method: the longitudinal section of the non-woven fabric is magnified by an electron microscope to observe the cross-section of the fiber, and the cross-sectional area of the fiber of the standard thickness at the position of 1 , is used, and the value and resin density are utilized. The fineness is calculated, and the average value is taken as the fineness. In order to smooth the surface of the nonwoven fabric, it is also important to reduce the surface fibers. In order to reduce the fuzzing of the fibers, it is important that the fibers are bonded to each other such that the free ends of the fibers are not present on the surface of the fibers. As described above, the nonwoven fabric of the present invention is produced by a gas permeable method, so that the fibers are surely bonded to each other, and it is advantageous to use the fibers of 108774.doc -10- 1363819. From this point of view, the fiber contained in the j-th layer is preferably a heat-fusible fiber made of a thermoplastic resin, which is preferably a core-sheath type or a side-by-side type composite fiber (4). Fiber. Further, as described later, in the step of producing the nonwoven fabric by the gas permeable method, the first layer side is directed toward the gas permeable material, and when the second layer is blown with hot air, the fiber fluffing on the side surface of the first layer can be further reduced. . When the first layer has the above configuration, the average deviation of the surface roughness of the second layer side surface of the non-woven fabric (hereinafter referred to as SMD) * 2 5 or less is preferably 2 3 μηι or less < extremely low value. The lower limit of the coffee is not particularly limited, and the closer it is to the better, but the lower limit is, in particular, as low as 〇 5 (four), the sufficient smoothness of the non-woven fabric can be imparted. Further, the average deviation (hereinafter referred to as MMD) of the friction coefficient of the first layer side surface of the non-woven fabric is less than 〇·_, and is preferably an extremely low value of 6 or less.之下 The lower limit is not particularly limited, and the closer it is to the better, but the lower limit is 0.004, especially as low as 〇_〇〇3, which gives the non-woven fabric sufficient smoothness.

SMD and MMD were measured by KEFFB4-AUTO-A (trade name) manufactured by KATO TECH Co., Ltd. in accordance with the method described in the following book. Specifically, it was measured by the following method. Kawabata Hiroshi, "The Standardization and Analysis of Texture Evaluation", the second edition, and the Society of Fibre Machinery (The TextUe Maehinery §. 4 hitting Japan), the Institute for Texture Measurement and Normalization, Showa 55 (March 10, 198) Japanese issue [Determination of the average deviation SMD of surface roughness] 108774.doc 1363819 Prepare a test piece of 20 cm x 20 cm, placed on a test stand with a smooth metal plane. Press the contactor at 9.8 cN (within ±0.49 cN) Attached to the test piece, the test piece was horizontally moved by 2 cm at a certain speed of 〇·1 cm/sec. A single-axis tension of 19.6 cN/cm was applied to the test piece. The contactor was made of a piano wire having a diameter of 0_5 mm. The 5 mm is bent into a U-shape and the test piece is crimped at 9.8 cN. The contact piece is crimped by a spring with a spring constant of 245 cN/mm (within ±0.98 cN/mm) and the resonant frequency is in contact with the surface. The state 'is 30 Hz or more. The measured value of the average deviation of the surface roughness is represented by SMD. This measurement is performed simultaneously on MD and CD, and the average value is calculated by the following formula (1) as the average deviation SMD of the surface roughness. Average surface roughness Difference SMD= { (SMDmd2+SMDcd2)/2 }1/2 [Measurement of Mean Deviation MMD of Friction Coefficient] Prepare a test piece of 20 cm x 20 cm and place it on a test stand with a smooth metal plane. The contactor is 49 cN. The force was applied to the test piece by pressure. The test piece was horizontally moved by 2 cm at a constant speed of 0.1 cm/sec. A single-axis tension of 19.6 cN/cm was applied to the test piece. The contactor was used for surface roughness. The contactors used for the measurement were the same. The 5 mm diameter piano line was arranged in 20 rows and bent into a u-shaped contactor with a width of 10 min. The test piece was crimped with a weight of 49 cN by a weight. The measured value of the average deviation is represented by the MMD value. This measurement is performed simultaneously on MD and CD, and the average value is calculated by the following formula (2) as the average deviation of the friction coefficient. The average deviation of the friction coefficient mmd={(mmdmd2+mmdcd2) ) 2}"2 (2) Next, the softness of the non-woven fabric is explained. Even if the surface of the non-woven fabric is smooth, the drape is low and not soft, and it will have a paper-like touch, and its quality is 108774.doc -12 - Poor feeling. As a measure of the degree of softness of non-woven fabric, In this technical field, bending rigidity (hereinafter also referred to as B) is used. The bending rigidity B of the nonwoven fabric of the present invention is as low as 〇〇3 cN.cm2/cm or less, preferably less than CC•Cm2/cm, and the bending rigidity B exceeds 〇. When 〇3 cN*Cm2/cm, it is not possible to impart sufficient flexibility to the non-woven fabric, and it is not possible to improve the overall skin feel. The lower limit of the bending rigidity B is not particularly limited, and the closer to the heel, the lower limit is as low as 0.015, and particularly low to 〇 · 〇 1 to impart sufficient flexibility to the nonwoven fabric. In order to make the bending rigidity B lower than the aforementioned value, for example, an operation such as performing a non-woven fabric or the like, it is advantageous to deform the entire structure of the nonwoven fabric (for example, to locally deform or break the bonding point of the fiber), specifically, as will be described later. The calendering of the steps after the non-woven fabric is manufactured, and the deformation of the overall structure of the nonwoven fabric is quite advantageous. In the present invention, the bending rigidity B means a value measured by a pure tester (kESFB2_auto-a manufactured by Kadlik Corporation). The bending rigidity B was measured in accordance with the above-mentioned "standardization and analysis of texture evaluation". Specifically, it was measured by the following method. [Measurement of Bending Rigidity B] A test piece of 20 cmUO cm was prepared and placed on a test stand. The test piece was held by a chuck of i cm interval, and the test piece was subjected to a pure curvature of constant velocity curvature in a range of curvature K = _2.5 to +2.5 cm·1. One cycle (CyCie) deformation was performed at a deformation speed of 〇5 〇 cm /sec. The bending rigidity b is calculated by the slope of the bending moment between the curvatures 〜5 to 15 and -0.5 to -1.5 in the above-mentioned "standardization and analysis of texture evaluation", but in the measurement of the non-woven fabric, it is here. The case of deflection between curvatures makes it difficult to express the correct value of 108774.doc -13-1363819. Therefore, the bending rigidity B of the present invention is calculated by using the slope of the maximum bending moment value and the minimum bending moment value. This measurement was carried out simultaneously with MD and CD, and the average value was calculated by the following formula (3) as the bending rigidity B. Bending rigidity B = {(Bmd2+Bcd2)/2} 1/2 (3) Next, the elastic feeling of the non-woven fabric is explained. The so-called elastic feeling is a feeling of how much the non-woven fabric can be compressed in its thickness direction and the extent to which the thickness can be restored when the compression is released. ❿' As previously described in relation to non-woven fabrics, the first layer preferably contains finer fine fibers, that is, the density is preferably higher. As a result, when there is only a layer, the nonwoven fabric is hardly sufficiently compressed in the thickness direction, and even if the compression is released, the thickness is hard to recover. In the non-woven fabric of the present invention, X ′ is used, and the second layer having a lower density than the second layer is used, and the second layer imparts a non-woven fabric elastic feeling. Specifically, as will be described later, in the calendering process, the second layer is formed to be made of a soft material, and it is difficult to apply a resin roller with a pinch pressure. In this case, the density of the second layer is 10 to 80% smaller than the density of the first layer, especially 20 to 60 〇 / ,, which is more effective for imparting a feeling of elasticity. Regarding the density of each layer, from the viewpoint of imparting a feeling of elasticity to the non-woven fabric, the density of the i-th layer is ideal at (ΜΠΗΜ g/em3, especially at 〇〇2 to 〇〇5 g/: on the other hand, imparting non-woven fabric From the viewpoint of the elastic feeling, the density of the second layer is preferably 〇〇〇5 to 〇〇4 §/coffee 3, especially at 0·〇1 to 0.03 g/cm3. ', in order to give a non-woven fabric by the second layer Elastic feeling, preferably, the enthalpy contained in the second layer: the fiber which has a small amount of flattening to the I. It is advantageous to reduce the amount of the compressed fan to use the fiber of the coarseness. From this point of view, the first 2 sound 108774.doc 1363819 The fiber contained in the fineness is preferably h5~5.0 dtex, especially 丨7~3 〇 to better. When the fineness is within this range, the thickness of the second layer fiber is difficult to The influence of the j layer side, the average deviation smd of the surface roughness of the surface of the i-th layer and the average deviation MMD of the friction coefficient are both small, and the smoothness of the non-woven fabric can be improved. Moreover, the fineness of the fiber contained in the second layer The fineness of the fiber contained in the second layer is also quite satisfactory. In this case, the fineness of the fiber contained in the second layer It is 20 to 200% larger than the fineness of the fiber contained in the first layer, and especially when it is 40 to 150% larger, it can effectively give a feeling of elasticity. • In addition to the low density, the second layer is improved from the point of improvement in elasticity. It is advantageous to have a larger thickness. From this point of view, the thickness of the second layer is preferably 0.3 1·2 mm, particularly preferably 〇4 to 〇.8 mm. On the other hand, from the viewpoint of the two senses of elasticity The thickness of the first layer is smaller than the thickness of the second layer. Specifically, it is preferably 0.05 to 0.5 mm, particularly preferably 0.1 to 0.3 mm. The thickness of the nonwoven fabric is preferably 〇·5 to 1.5 mm.特 〇 5 5 5 5 5 5 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第When lC exceeds 〇3, it cannot give a full elastic feel to the non-woven fabric, and it is impossible to obtain a good touch of the skin. The lower limit of Lc is not particularly limited, and the closer it is. The better, but the lower limit is 0.2 ' When the level is as low as 〇15, the non-woven fabric can be given a +4<ping force feeling. In the present invention, the so-called LC is based on Kadley. The value of the ICESFB3-AUT0-A measured by the system is determined by the method described in the Standardization and Analysis of Texture Evaluation described above. Specifically, it is determined by the following method.

l〇8774.dOC -15· 1363819 [Determination of linear LC of compression characteristics] A test piece of 20 cm x 20 cm was prepared and placed on a test stand. The test piece was compressed between steel plates having a circular plane with an area of 2 cm2. The compression speed is 20 μηη/sec ‘pressure maximum load is 4.9 kPa. The recovery process is also measured at the same speed. The linearity of the compression characteristics is expressed as an LC value. The LC value is defined as follows (4): LC=WC/WOC (4)

Where: wc = [T〇PDT JTm WOC=Pm(TO-Tm)/2 . Also, TO represents the thickness of the sample at a pressure of 49 pa,

Tm represents the thickness of the sample at the maximum pressure pm (49 kPa). The weight per unit area of the first layer and the second layer is not critical from the viewpoint of improving the touch of the skin, and can be appropriately determined according to the specific use of the nonwoven fabric. The weight per unit area of non-woven fabrics is also the same. The non-woven fabric of the present invention is used, for example, as a constituent material of an absorbent article such as a disposable diaper or a sanitary napkin. The unit weight of the second layer is preferably 5 to 15 g/m 2 'at a very good value of 7 to 12 g/m2. The weight per unit area of the second layer is preferably from 5 to 45 g/m2, particularly preferably from 7 to 25 g/m, and the weight per unit area of the nonwoven fabric is preferably from 10 to 60 g/m2, particularly preferably from 15 to 40. g/m2. In this case, the tensile strength of the non-woven fabric is preferably from 1 〇 to 1 〇〇 N/5 〇 mm in the flow direction (MD), particularly preferably from 2 〇 to 70 N/50 mm, preferably in the width direction (CD). 4~15 N/5 0 mm 'excellent for 5~12 N/5〇mm. Tensile strength is measured by a tensile tester with a distance between the chucks of 15 〇 mm and a tensile speed of 3 〇〇 mm/min. I08774.doc • 16 · 1363819

=25 g/m2' is particularly preferably 7 to 2 〇 g/m2e. The weight per unit area of the nonwoven fabric is preferably 10 to 40 g/m2, particularly preferably 15 to 3 〇g/m2e.

In particular, when the nonwoven fabric of the present invention is used as the outermost constituent material of the absorbent article, the weight per unit area of the first layer is preferably from 5 to 15 gm, particularly preferably from 7 to 12 g/m2. The basis weight of the second layer is preferably that the constituent fibers of the first layer and the second layer are not particularly limited, and the fibers of the appropriate material can be used in accordance with the specific use of the nonwoven fabric. In view of the fact that the nonwoven fabric of the present invention is produced by a gas permeable method, it is preferred that the fibers contained in each layer use heat-fusible fibers. Further, in addition to the heat-fusible fibers, a small amount of non-fusible fibers such as rayon or cotton 'pulp may be blended for the purpose of imparting a desired function to the nonwoven fabric. In the first layer and / or the second layer. Further, it is also possible to use a fiber which is originally heat-dissolvable but does not exhibit heat fusion at the heat-melting treatment temperature of the nonwoven fabric of the present invention, such as polyester fiber or polyamide ( The p〇iyamide) fiber or the like is blended in the first layer and/or the second layer. The fiber length of the fiber is not particularly limited, but it is preferable to use a short fiber of about 38 to 60 mm from the viewpoint of the formability of the fiber web as a raw material of the gas permeable method. Next, a suitable manufacturing method of the nonwoven fabric of the present invention will be described with reference to Fig. 1 . BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing a device suitable for use in the manufacture of the nonwoven fabric of the present invention. The apparatus 10 shown in Fig. 1 has a web forming portion 20, a heat-fusible portion 30, and a rolled portion 40. The first and second card machines 21 and 22 are provided in the web forming unit 20. The first card 21 is used to manufacture the first web for forming the first layer, 108774.doc -17-1363819. The second card 22 is used to manufacture the second web for forming the second layer, from the raw material fiber. A supply unit (not shown) supplies the raw material fibers to the respective carding machines 21, 22 to card the fibers. Thereby, the first web η and the second web 12 are formed. The second web 12 is superposed on the first web 11. Thereby, a laminated web 13 of two webs is formed. The endless belt 31 composed of a mesh-like gas permeable material such as a wire mesh conveys the fiber web 13 and introduces it into the heat-melting portion 30. In the heat attachment portion 30, a blowing blower 32 for hot air is disposed at a position toward the fiber web 13 conveyed on the endless belt 31. A suction box 33 is provided at a position facing the blower 32 with the endless belt 31 interposed therebetween. » When the web 13 passes under the blower 32, hot air heated to a specific temperature penetrates the web 13, and is utilized at that time. The heat causes the heat-fusible fibers contained in the fiber web to soften or even melt to bond the intersections of the fibers with each other, whereby the air permeable nonwoven fabric 14 is obtained. The hot air passing through the fiber web 13 is recovered by the suction box 33. The blowing temperature of the hot air is appropriately determined in accordance with the melting point of the constituent resin of the heat-dissolving fiber contained in the fiber web 13, the conveying speed of the fiber web 13, the weight per unit area, and the like. In the case where the resin of the hot-melt component is polyethylene, the temperature of the hot air is preferably from 120 to 150 ° C, particularly preferably from 130 to 145 ° C. . For the same reason, the hot air blowing time is preferably 5 to 3 seconds, and particularly preferably 5 to 20 seconds. When hot air is blown to the fiber web 13, the first web of the fiber web 13 is caused to blow the hot air from the side of the second web 12 toward the belt 31. As a result, the first fiber 108774.doc • 18 - 1363819 The side is pressed by the belt 31 to present a flat surface in which the hair is suppressed. This is advantageous from the point that the first side surface of the resulting non-woven fabric can be smoothed. The thus obtained non-woven fabric 14 is introduced. In the rolling section 40, the nonwoven fabric 14 is subjected to a multi-stage rolling process. The rolling section 4 has a metal rolled roll 41 and first and second resin rolls 42 and 43. Each of the resin rolls 42 and 43 is disposed to face the calender roll 41. The respective rolls 41, 42, 43 are arranged in a vertical shape. In the conveyance direction of the nonwoven fabric 14, the first resin roll 42 is disposed on the upstream side, and the second resin roll 43 is placed. The non-woven fabric 14 is first introduced between the first resin drum 42 disposed on the upstream side and the rolling drum 41, and is subjected to the first-stage rolling process. In this case, the first layer side is oriented toward the calender roll. Import non-woven 14. The calendering process presses the first layer side of the calender roll 4 1 to flatten the fibers contained in the first layer, and the first layer is densified by being pinched. The non-woven fabric 14 exerts a "twist" effect to partially deform or break one of the joint points of the fibers to soften the nonwoven fabric 14. The fiber contained in the second layer facing the first resin cylinder 42 is made of a soft material because the resin roller 42 is made of a soft material, so that it is difficult to be deformed by the pinch pressure, and it is difficult to increase the density. The major axis direction of the cross section of the fiber contained in the first layer of the flat deformation is oriented in the plane direction of the nonwoven fabric 14. The line speed of the first layer is easy to flatten and deform, and the line pressure of the first stage is 5 〇 to 700 N/cm. It is ideal at 1〇〇~300 N/cm. Also, calendering l〇8774.doc -19· 1363819 The drum 41 and/or the resin drum can be used after being heated to a specific temperature or in a non-heated state. Preferably, any one of the calender rolls 41 and the resin rolls 42, 43 is used in a non-heated state, and the calendering process is carried out at room temperature. The calender roll 41 can use a smooth roll that is mirror-finished, or a roll that is applied with fine irregularities such as pear lines. As the resin drum 42, for example, a drum made of a resin such as hard rubber, silicone rubber, urethane rubber, NBR or EPDM can be used. The D hardness (JIS K6253) of these resins is preferably from 40 to 1 degree, particularly preferably from 70 to 95 degrees. When a resin roller of 40 degrees or more is used, the flatness ratio of the cross section of the fiber on the second layer side can be increased, and sufficient smoothness can be obtained. Further, the entire structure of the nonwoven fabric is easily deformed, and sufficient flexibility can be imparted. When a resin roller (including a metal roller) of 100 degrees or less is used, the density of the fiber is not excessively high, and a sufficient elastic feeling can be obtained. Therefore, it is difficult to cause a paper-like touch and a lack of texture. Next, the non-woven fabric is introduced between the second resin drum 43 disposed on the downstream side and the rolling drum 41, and is subjected to the second-stage rolling process. At this time, the nonwoven fabric 14 is also introduced so that the first layer side faces the calender roll 41. Further, the second stage rolling process is further applied to the second layer side of the calender roll 41 to further deform the fibers contained in the first layer to increase the degree of flatness, and the second layer is further densified by being pinched. Further, the long axis direction of the cross section of the fiber contained in the first layer of the flat deformation may be further oriented in the plane direction of the nonwoven fabric. Further, the non-woven fabric 14 is applied with a "搓揉" effect to further improve the flexibility. ^ Preferably, the line pressure system for the second stage of the calendering process is selected from the pressure of the relevant section. 108774.doc • 20· 丄 819 The range of the line pressure of the processing is within the aforementioned range. In particular, when the line pressure of the rolling process of the second stage is set to be lower than the line pressure of the rolling process of the first stage in the above range, it is difficult to increase the density from the second layer side by the nip, thereby reducing the pressure. The full sense of the sense of elasticity is quite ideal. Specifically, it is preferably from 20 to 200 N/cm', particularly preferably from 2 to 15 N/cm. As the second resin drum 43', it is preferable to use a drum having a material having a D hardness in the same range as the above-described range of the crucible hardness of the first resin cylinder 42. One of the features of the present manufacturing method is that the calendering is performed in a plurality of stages. As a result of review by the inventors of the present invention, even in the case where the rolling process is performed for one section, the fiber is not sufficiently flattened even if it is set to a too severe rolling condition, and even if it is flattenable, the long axis direction of the flat fiber cannot be surely determined. Oriented to the plane direction of the non-woven fabric. After the calendering process is completed, the non-woven fabric 14 may be subjected to various post-processing as needed. For example, as described later, in the case where the nonwoven fabric 14 is used as a surface material of an absorbent article, a hydrophilization treatment using various hydrophilizing agents is carried out. A non-woven fabric for the purpose can be obtained as such. The obtained non-woven fabric can be used, for example, as a constituent material of an absorbent article such as a disposable diaper or a sanitary napkin, a sheet-like packaging cosmetic material, a base material for a cleaning sheet, a substrate for impregnating a sheet, or the like. In particular, since the nonwoven fabric of the present invention is smooth and flat on the side of the second layer, it is preferable to use the nonwoven fabric as a constituent material of the absorbent article, and it is preferable that the second layer side of the nonwoven fabric is placed in contact with the skin of the user. As a specific use form in which the non-woven fabric is placed in contact with the skin of the user, a type in which a non-woven fabric is used as a liquid-permeable surface material, 108774.doc -21 · 1363819, and a non-woven fabric is used as the plain type. , θ ^ Λ ~ The outermost constituent material of the sexual item iL, the special 'ren is not limited to this stem σ, heart,. The non-woven fabric is used as the outermost constituent material of the absorbent mouth. Since most of the woven fabric is folded over the surface side at the edge portion and/or the side edge portion of the absorbent article, the non-woven fabric is used. The first layer is oriented sideways. When the non-woven fabric is disposed on the outer side of the sigma σσ, the flute phase I, & of the folded portion can be contacted with the skin of the user. As described in detail above, the non-woven fabric of the present invention has a low surface roughness and is smooth, drapable and soft, and has a high compression recovery property in the thickness direction and a elastic feeling. Therefore, the combination of the invention of the Essence of the Essence and the non-woven fabric of the Zhanyue is very good. The preferred embodiment of the nonwoven fabric of the present invention has been described above, but the present invention is not limited to the foregoing embodiment. For example, in addition to the fibers contained in the first layer, the cross-section of the fibers contained in the second layer can be flattened.

Further, in the manufacturing method of the above-described embodiment, the rolling process is divided into one #又', but three or more stages of calendering may be used instead. In addition, as a whole, 'best, the calendering process is at room temperature, with a line pressure of 2 〇 to 7 〇〇 N/cm ' using a metal calendered roll and d hardness (jis Κ 6253) 40 to 100 degrees of resin The roller is applied. Further, in the manufacturing method of the above-described embodiment, the rolling process of the second stage is a resin having a linear pressure of 20 to 200 N/cm, a rolling roll made of metal, and a resin having a D hardness of 40 to 100 degrees under room temperature conditions. The drum is applied, but only one of the sections of the calendering process can be carried out under these conditions. [Examples] 108774.doc • 22· 1363819 Hereinafter, the present invention will be described in more detail by way of the examples. However, the scope of the invention is not limited to the embodiment. [Examples 1 to 6] A nonwoven fabric was produced by using the apparatus shown in Fig. 1. The short fibers of the composition shown in Table 1 were combed to have a basis weight as shown in the table to form first and second fiber webs. The second web was placed on the first web and subjected to a gas permeable process under the conditions shown in Table 1 to obtain a nonwoven fabric. At this time, the first web is directed toward the belt, and hot air is blown from the second web side. The obtained non-woven fabric was subjected to two-stage calendering at room temperature. Processing conditions are shown in Table 1. The calender roll uses a metal roll formed with a pattern of a grain surface number 350. A hard rubber roller having a D hardness of 90 degrees was used for the second and second resin drums. [Comparative Example 1] A nonwoven fabric was obtained under the conditions shown in Table 1. In this comparative example, no calendering was performed. [Comparative Example 2]

A non-woven fabric was obtained in the same manner as in Example 1 except that a heat-treated roller was used instead of the gas-permeable process. The heating temperature of the drum is 135 °C. [Comparative Example 3] The non-woven fabric obtained by the spunbonding method was subjected to calendering under the same conditions as in Example 。. [Comparative Example 4] A nonwoven fabric was obtained under the conditions shown in Table 1. In the present comparative example, no operation was carried out. 108774.doc -23· 1363819 [Comparative Example 5] A nonwoven fabric was obtained in the same manner as in Example except that the calendering was carried out in one step. [Comparative Example 6] The linear pressure of the rolling process is as shown in Table ,, and the same as in the first embodiment except that the rubber roller having a D hardness of 27 degrees (A hardness of 75 degrees) was used as the resin roller for the second-stage rolling process. The method is made of non-woven fabric. g [Evaluation] Table 2 shows the basis weight I and the thickness of the nonwoven fabric obtained in the examples and the comparative examples, and the basis weight and density of the first layer and the second layer. Further, the longitudinal section of the nonwoven fabric was enlarged by an electron microscope to observe the cross-sectional shape of the fiber contained in the second layer, and the flatness was obtained. The results are shown in Table 2. Further, the SMD &MMD on the first layer side of the nonwoven fabric and the compression rigidity LC, the bending rigidity B, and the tensile strength of the nonwoven fabric were measured. Further, Fig. 2 and Fig. 3 show electron microscopic images of the second layer side surface of the nonwoven fabric obtained in Example 1 and the cross section of the nonwoven fabric, respectively. Further, Fig. 4 is an electron microscope image showing the surface of the first layer side of the non-woven fabric obtained in Comparative Example. In addition, from the viewpoint of softness and smoothness, the touch of the non-woven fabric is evaluated by S. For the 1st reviewer, the following five stages are used for evaluation. The average score of 10 people was used as a result, which is disclosed in Table 3. • Regarding the softness of the evaluation of “soft and good skin feel”, 5 points: so agree with 4 points: slightly agree with 108774.doc -24· 1363819 3 points: can't say good or bad 2 points: not so Agree with 1 point: not so recognized. • Evaluation of smoothness,

For "smooth and good skin feel j 5 points: so agree 4 points: slightly so agree 3 points: can't say good or bad 2 points: not so agree 1 point: not so agree

108774.doc •25- 1363819

Calendering line pressure (N/cm) Stage 2 irj yr\ yn 1 1 1 CS Os m Stage 1 yr\ (N mm (N in yr\ CN in <N m <N mm CN 1 (N CN 1 ιτ-ί in (N irj (N non-woven processing hot air processing time (sec) 00 00 00 00 00 00 00 1 1 00 00 00 temperature CC) Ο oo oo 〇o 〇1 1 〇oo Breathable breathable breathable breathable Method: Breathable, Breathable, Breathable, Heated, Rolling, Spun, Viscose, Breathable, Breathable, Breathable, Fiber, Layer 2, icH "C, Zhao ΐ ^ ^ 〇1) S吟 No W 〇 (Ν ooo 1 1 〇ο Denier X length (dtexXmm) 2.0x44 2.0x44 1.7x44 1.7x44 1.7x44 1.7x44 1.7x44 1 1 1.7x44 2.0x44 1.7x44 core/skin composition ΡΕΤ/ΡΕ ΡΕΤ/ΡΕ PET/PE PET/PE PET/PE PET/PE PET/PE 1 1 PET/PE PET/PE PET/PE No layer 1 ~ V0 ΦΊ Ng Uniform AS吟w 〇00 〇00 00 〇〇<N <N 〇00 Ο Fineness X length (dtexXmm) 1.2 X44 1.2x44 1.2x44 1.2x44 2.0x44 1.1x38 2.0x44 2.0x44 1 <N 2.0x44 1.2x44 1.2x44 core/skin composition ΡΕΤ/ΡΕ ΡΕΤ/ΡΕ PET/PE PET/PE PET/PE PP/PE PET/PE Oh CU PET/PE PET/PE PET/PE PET/P E <Ν inch (N m inch teaching umbrella ball IH ^ ^ W crab 10 铋 carbon 刼 female - hair "铋嫦Ϊ? Μ · · · 3<ΙΛΜ 费翁 φϊ·«τ^^·^ν hair 10 Age-old niece* 避 salt-^to key®-M^^^^^e, **3d/13d 108774.doc • 26- 1363819 <N< ^ B think day 8 inch ν〇〇〇VO 卜 in卜vd 寸 inch 00 35.8 ι> v〇v〇OO 4 § z MD 32.6 35.8 39.1 40.3 39.6 5 33.4 39.8 48.0 33.4 1 31.5 41.3 B cN · m2/cm 0.021 0.024 0.023 0.021 0.018 0.023 0.021 0.013 0.020 0.021 0.063 0.027 0.27 0.27 0.25 0.23 0.23 0.27 0.25 0.42 0.30 0.25 0.36 0.35 MMD 0.0051 0.0049 0.0049 0.0050 0.0053 0.0062 0.0068 0.0064 0.0099 0.0068 0.0051 0.0058 SMD μηι (N (N CN 〇CN f—η CN 〇\ 寸 CN (N 00 CN 卜 r4 CN (N CN Fiber flatness 1.54 1.53 1.54 1.45 1.59 1.44 1.08 1.36 1.04 1.08 O 1 1.25 I cO ^5b 5 m | 2nd layer 1 0.028 0.023 0.021 0.030 0.013 0.025 0.026 1 1 0.026 0.018 0.020 11st layer I 0.032 0.032 0.038 0.038 0.031 0.037 0.043 0.062 0.086 0.043 0.026 0.055 Thickness 3 0.74 0.83 0.74 0.70 0.58 0.76 0.83 0.37 0.22 0.83 1 .23 0.75 Unit weight (g/m2) Layer 2 1-0.6 13.8 10.7 11.8 10.5 10.5 Bu ON 1 1 Bu OS ON 10.7 1 Tier 1 I as 〇00 in 〇< inch od OO οό 10.0 Os 23.1 18.9 Os oo 10.5 Overall 20.1 21.8 20.2 20.2 19.3 20.5 19.2 23.1 18.9 19.2 20.2 21.2 m inch cs inch-27-

108774.doc 丄30:)δ丄y • %

From the π-, ^, a π fruits shown in Tables 1 and 2, it can be understood that the first layer of the non-woven fabric obtained in each of the examples is the main one. The SMD and MMD values of γ are relatively low, so that it is relatively flat: the f-curvature is low, and it is known to be relatively soft. Further, it is understood that the compression rigidity -' is high in the elastic feeling, and it is known that it has sufficient strength. Further, from the results of K, it can be understood that the non-woven fabric obtained in each of the examples is softer and smoother than the non-woven fabric obtained in the comparative example. • It can be understood from FIGS. 2 and 3 that the j-th layer of the non-woven fabric obtained in Example 1 is included. The fiber is formed flat, and the long direction of the cross section of the fiber is oriented substantially in the plane direction of the non-woven fabric. For this reason, the fiber contained in the second layer of the non-woven fabric of the comparative example is circular. It is shown that, however, it is confirmed that the non-woven fabric obtained in the examples other than the first embodiment has a flattened fiber contained in the second layer, and the long-axis direction of the transverse shaving surface of the fiber is oriented substantially in the plane direction of the non-woven fabric. Fig. 1 is a view showing a pattern suitable for use in the manufacture of the nonwoven fabric of the present invention. 108774.doc • 28 · 1363819. Fig. 2 is an electron image of the second side surface of the nonwoven fabric obtained in Example 1. The electron microscopic image of the longitudinal scratched surface of the non-woven fabric of the non-sensitive fabric obtained in Example 1. Fig. 4 is the electron micrograph of the side surface of the first layer of the nonwoven fabric obtained in Comparative Example 1.

[Description of main components] 10 Apparatus 11 First web 12 Second web 13 Web 14 Non-woven fabric 20 Web forming section 21 First carding machine 22 Second carding machine 30 Hot-melting part 31 Endless belt 32 Blower 33 Pumping Suction box 40 Calendering section 41 Calendering drum 42 First resin cylinder 43 Second resin cylinder I08774.doc -29.

Claims (1)

1363819 Application for application. The monthly patent range is _ (100 years ^ ΓΒ: ΊΤ ^ 10, the scope of the patent application: , qing ι · a non-woven fabric, which has a layer 2 of the surface of the clothing 1 of the Le 1 sliding surface, the density of the second layer Lower than the first gas permeable method; the degree of the layer, and the cross section of the fiber contained in at least the first layer is flat, the flatness of the cross section of the fiber (long axis length / short axis illusion is 1>2 or more, and the major axis direction of the straight cross section is oriented substantially in the plane direction of the non-woven fabric /, • the fineness of the fiber contained in the second layer is larger than the fineness of the fiber contained in the first layer' and the first layer The fineness of the fiber contained is 0 05~2 0 dtex, and the fineness of the fiber contained in the second layer is L5~3·〇dtex; the average deviation of the surface roughness of the surface of the first layer is 8 Hereinafter, the average deviation MMD of the friction coefficient is less than 0.008; and the linearity of the compression characteristics of the non-woven fabric is 〇3 or less and the bending rigidity B is less than 〇.3 cN · cm 2 /cm. The non-woven fabric of the first item 1 is the first layer. The transverse scraping of the portion between the fibers of the fibers contained 3H is a non-woven fabric in which a metal calender roll and a tree drum are used to apply a multi-stage calendering process to the first layer side toward the calender roll to deform the fibers contained in the first layer. A non-woven fabric, such as a non-woven fabric of the kiss item 1, wherein the fiber layer is a core-type hot-melt fiber contained in the first layer, and the absorbent article comprises the non-woven fabric of claim 1, the non-woven fabric. The first layer side surface is configured to be in contact with the skin of the user, and the weight per unit area of the first layer is 5 to 15 g/m 2 , and the unit of the second layer is 108774-100 Q829.doc 6. The area weight is 5 ～45 10〜50吕/〇12. g/m2, the unit weight of the nonwoven fabric as a whole is the surface material in which the above non-woven fabric is used as the liquid material of the absorbent article of claim 5. The article, wherein the outermost constituent material of the non-receiving article is used. The method for manufacturing the non-woven fabric, which is a non-woven original fabric obtained by a gas permeable method, is subjected to a calendering process; View 1, the #-(4) extension processing system, under the condition of the shirt, with a linear pressure of 20~200 N/cm, using a metal calendered roller and D hardness (JIS K6253) 4〇~1〇〇 resin roller Wherein the non-woven original fabric has a multilayer structure comprising a first layer of one surface and a second layer containing the other surface; the fineness of the fiber of the second layer is greater than the fineness of the fiber contained in the first layer; The method of manufacturing the first layer side toward the calendering roll is carried out. 9. The manufacturing method of claim 8, wherein the calendering process of the second stage is performed in two stages, at room temperature, Line pressure 20~200 N/cm 'The use of metal rolling drum and 〇 hardness (jis K6253) 40 ~ 100 degrees resin roller implementer. The manufacturing method of claim 8, wherein the line pressure of the second stage of the calendering is set lower than the line pressure of the calendering of the first stage. The manufacturing method of claim 10, wherein in the step of producing the non-woven fabric by the gas permeable method, the first layer side is directed toward the gas permeable material, and the second layer side is blown by 108774-1000829.doc 1363^19. . 12. The manufacturing method according to claim 8, wherein the calendering is performed so that the average deviation SMD of the surface roughness on the first layer side after the calendering is 2.5 μηι or less and the average deviation MMD of the friction coefficient is less than 0.008. 13: The manufacturing method of claim 8, wherein the calendering process is performed to deform the fiber after the calendering process into a flat shape, and the longitudinal direction of the conformation surface of the fiber having a cylinder 丄L and being opened/flattened is substantially Oriented to the plane direction of the original fabric that is not woven. 108774-1000829.doc