JPH09279460A - Unidirectionally stretchable nonwoven fabric and its production, and diaper, sanitary article using the nonwoven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a nonwoven fabric having stretchability only in a direction, to provide a method for simply and efficiently producing the nonwoven fabric, and further to obtain a diaper or sanitary article excellent in a lateral leakage- preventing performance and in production machine characteristics. SOLUTION: This unidirectionally stretchable nonwoven fabric mainly comprises polyolefin resin fibers, and has an elongation of 5-70% in a direction and an elongation of 100-500% in a direction orthogonal to the direction. The nonwoven fabric has further a 10% elongation recovery ratio (SMD/STD) of <=0.9 between the direction and the direction orthogonal to the direction, and further has a 10% elongation stress ratio (FMD/FTD) of >=10 between the direction and the direction orthogonal the direction.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a unidirectionally stretchable nonwoven fabric, a method for producing the same, and a diaper and a sanitary product using the nonwoven fabric. More specifically, it is suitable for diapers that have elasticity in only one direction, members for sanitary products such as waistbands (also called extension tapes and side flaps), fastening tapes, three-dimensional gathers, topsheets, backsheets, etc. The present invention relates to a unidirectionally stretchable nonwoven fabric used, a method for producing the same, and a diaper and a sanitary product using the nonwoven fabric.

[0002]

2. Description of the Related Art Nonwoven fabrics conventionally used for diapers and sanitary products, such as backsheets, waistbands (also called extension tapes and side flaps), fastening tapes, three-dimensional gathers, etc., have excellent elasticity. In view of machine (handling) suitability for a diaper manufacturing machine or the like, it is preferable to use a material having a small elongation in the flow direction of the manufacturing line, so that elasticity in only one direction is required. For example, a waist band is a band for wearing a diaper or the like and stopping it at the end. It easily stretches in the lateral direction, and even if the band is stretched with an appropriate tension, it needs to shrink when tension is released. . In addition, in order to further increase the added value of pants-type disposable diapers and sanitary napkins, a body with a three-dimensional gather for preventing side leakage is newly commercialized on both sides of the excretory liquid absorber. The side leakage prevention performance is the water repellent performance of the three-dimensional gather material and the adhesion to the body,
Depends on trackability. The current product aims to prevent side leakage by increasing the adhesiveness between the three-dimensional gather and the skin by attaching a rubber thread to the end of the non-stretchable PR spunbonded nonwoven fabric or PP meltprone nonwoven fabric. However, if the diaper is displaced due to exercise, a gap may be formed between the three-dimensional gather and the body, and the side leakage prevention performance may be deteriorated.
As a countermeasure, there is a method of strengthening the elasticity of the rubber thread, but this is not preferable because the tightening force on the skin becomes strong, the feeling of pressure increases, and the skin is damaged. Further, a method of giving stretchability to the non-woven fabric is conceivable, but there is a problem in mechanical suitability at the time of production because it stretches in the longitudinal direction like polyurethane non-woven fabric. If a non-stretchable tricot is stuck to suppress the longitudinal elongation, it becomes stiff and unpleasant. Also,
It is expensive and not suitable for disposable products. As materials for such elastic waist bands and three-dimensional gathers, nonwoven fabrics and urethane films made of crimped elastic fibers or the like have been used.

[0003]

However, it is difficult for such a non-woven fabric to have stretchability in only one direction because of its structure, and to have substantially no stretchability in the direction orthogonal thereto. And, in the direction where elasticity is not substantially required, attach a non-stretchable woven tape or film,
It took time and labor to control expansion and contraction in that direction.

The present invention has been made in view of the above problems, and provides a non-woven fabric having elasticity in only one direction, and a simple and efficient production method thereof, and lateral leakage prevention. An object of the present invention is to provide a diaper, a sanitary article and members thereof having excellent performance and manufacturing mechanical properties.

[0005]

In order to achieve the above object, according to the present invention, a non-woven fabric composed mainly of fibers of a thermoplastic resin has an elongation in one direction of 5 to 70% and is orthogonal thereto. Direction elongation is 100-500
%, The unidirectionally stretchable nonwoven fabric is provided.

As a preferred embodiment thereof, a 10% elongation recovery rate (SMD) conforming to the elongation recovery rate A method stipulated in JIS-L-1096 in one direction and the 10% elongation recovery in the direction orthogonal to the 10% elongation recovery rate. Ratio with rate (STD) (SMD
/ STD) of 0.9 or less is provided.

As a preferred embodiment, 10% elongation stress (FMD) based on the tensile strength measuring method defined in JIS-L-1096 in one direction and the 10% elongation stress in the direction perpendicular to the 10% elongation stress (FMD). Ratio to (FTD) (FMD
/ FTD) of 10 or more is provided.

Further, (A) a non-woven fabric composed mainly of fibers of a thermoplastic resin is prepared, and (B) this unstretched raw fabric is stretched at a temperature between 60 ° C. lower than the melting point and 10 ° C. lower than the melting point. The stretching ratio is 1.4 to 4.
And a nip roll interval (distance between nip) is uniaxially stretched under the condition that the unstretched raw fabric width is 0.5 to 10 times the width of the unstretched raw fabric.

Further, as a preferred embodiment thereof, there is provided a unidirectionally stretchable nonwoven fabric or a method for producing the same, characterized in that the fibers of the thermoplastic resin are polyolefin resin filaments containing no elastomer component.

Further, there is provided a member for diapers and sanitary products, characterized by using the unidirectionally stretchable nonwoven fabric.

Further, there is provided a diaper and a sanitary product using the sanitary product member.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the unidirectionally stretchable nonwoven fabric and the method for producing the same according to the present invention will be specifically described below. The unidirectionally stretchable nonwoven fabric of the present invention is mainly composed of thermoplastic resin fibers, and has a specific elongation ratio, a 10% elongation recovery ratio, and a 10% elongation stress ratio in two directions orthogonal to each other. are doing. 1. Non-woven fabric of thermoplastic resin The material of the non-woven fabric of thermoplastic resin used in the present invention is not particularly limited, but for example, polyolefin resin, polyester resin, polyamide resin, polyacrylic resin, halogen-containing polyvinyl resin , Rubber-based resins and mixtures thereof. In consideration of water repellent property, flexibility, and recyclability when used for diapers, polyolefin containing no elastomer component,
And polyester resins are preferred. Among them, a polypropylene resin is particularly preferable. Examples of the polypropylene resin include homopolypropylene and a random copolymer of propylene and α-olefin (ethylene or the like). Further, a heterogeneous polymer such as polyester, polyamide and polycarbonate may be added in a small amount to these materials. Further, if necessary, additives such as a flame retardant, a pigment, an antistatic agent, and a weather resistance improver may be mixed. There is no particular limitation on the molecular weight of the polypropylene resin. In the present invention, the temperature of the melting point of the thermoplastic resin means the temperature that gives the extreme value of the melting absorption curve measured by DSC at a temperature rising rate of 10 ° C / min.

The yarn diameter of the non-woven fabric is usually 5 to 5.
It is 100 μm, preferably 10 to 50 μm. When the yarn diameter is smaller than 5 μm, yarn breakage tends to occur, and production of the fiber itself becomes difficult. On the other hand, when it is thicker than 100 μm, the texture of the nonwoven fabric becomes hard.

The unit weight of the nonwoven fabric of the present invention can be appropriately selected and used depending on the application. For example, when used as a back sheet, it is preferably 15 to 25 g / m ² . 15g
If it is thinner than / m ² , the strength is insufficient, and if it exceeds 25 g / m ² , the flexibility is impaired and the cost becomes high. When used in waist bands and fastening tapes, it is preferably 30 to 50 g / m ² . 30g / m
If it is less than ² , the strength is weak and it stays stretched when force is applied to stop the diaper. If it exceeds 50 g / m ² , the cost becomes high. When used for three-dimensional gathers, 10
Preferably ^{50g / m 2, 13~30g / m} 2 is more preferable. If it is less than 10 g / m ² , the side leakage prevention property is insufficient,
Moreover, a nonwoven fabric cannot be obtained stably. If it exceeds 50 g / m ² , the softness is insufficient and the wearing feeling is deteriorated.

2. Elongation rate In the present invention, the elongation rate is based on JIS-L-1096, and a test piece having a width of 5 cm and a length of 20 cm is pulled at a gripping interval of 10 cm and a pulling speed of 30 cm / min, and the elongation of the raw fabric until it breaks. Is the ratio (%) to the gripping interval of 10 cm. The elongation in the directions orthogonal to each other, for example, in the vertical and horizontal directions, is 100 to 500 in the horizontal direction.
%, Preferably 120 to 300%. 70 in the vertical direction
% Or less, preferably 50% or less, more preferably 30%
% Or less. If the elongation percentage in the transverse direction is less than 100%, sufficient elasticity cannot be obtained, and if it exceeds 500%, the raw material is stretched and does not recover. Further, if the elongation in the longitudinal direction exceeds 70%, the mechanical suitability for a diaper manufacturing machine deteriorates.

3. Ratio of 10% elongation recovery rate in two orthogonal directions The 10% elongation recovery rate (S10) in the present invention is obtained as follows. That is, JIS-L-109
In accordance with the elongation recovery rate A method specified in No. 6, a test piece having a width of 5 cm and a length of 20 cm was stretched by 1 cm at a gripping interval of 10 cm and a pulling speed of 10 cm / min, and allowed to stand for 1 minute as it is, then 10 cm / min. Relax at the speed of. The residual elongation (Lmm) when the stress becomes zero in the course of the relaxation is read from the description paper and can be obtained by the following equation. 10% elongation recovery rate (%) = [(10−L) / 10] × 1
00 In the nonwoven fabric of the present invention, the ratio of the 10% elongation recovery rate in two directions orthogonal to each other, for example, the longitudinal and lateral directions (SMD / S
TD) is preferably 0.9 or less. If it exceeds 0.9, the mechanical suitability for a diaper making machine deteriorates.

4. Ratio of 10% elongation stress in two directions orthogonal to each other In the present invention, 10% elongation stress (F10) means JIS.
According to the method for measuring tensile strength defined in -L-1096, it means the stress when a test piece having a width of 5 cm and a length of 20 cm is stretched by 1 cm at a gripping interval of 10 cm and a pulling speed of 10 cm / min. Therefore, it means that the larger the F10 is, the harder it is to elongate at the time of processing, and the more excellent the mechanical suitability is. In the nonwoven fabric of the present invention, the ratio of 10% elongation stress in two directions orthogonal to each other, for example, in the longitudinal and transverse directions (FMD
/ FTD) is preferably 10 or more, more preferably 20 or more. If it is less than 10, it will be stretched in the longitudinal direction with a low stress, and the mechanical suitability for a diaper making machine will be deteriorated, or the force required for stretching it in the lateral direction will be large, and for example, when used as a diaper. , The waistband may not meet the required performance. 5. When the unidirectionally stretchable nonwoven fabric of the present invention is used for a laminated body diaper, a member for sanitary products, for example, a waist band (also called extension tape or side flap), fastening tape, three-dimensional gather, top sheet, back sheet, etc.,
In addition to using it as a unidirectionally stretchable non-woven fabric alone, it is a laminate with various materials within the range that does not impair the required properties, for example, a breathable film and embossed laminate, or a breathable film with spots or spots. The adhesive may be applied to and laminated with a unidirectionally stretchable nonwoven fabric. Even when used in a three-dimensional gather, the same weaving method as in a three-dimensional gather using a normal non-woven fabric, a method of enclosing a thread rubber in the end of the non-woven fabric, and the like can be applied.

6. Manufacturing Method The unidirectionally stretchable nonwoven fabric of the present invention includes, as main steps, a web manufacturing step, a heat fusion step as required, and a uniaxial stretching step. (1) Step of producing web As described above, as the thermoplastic resin used in the present invention, a polyolefin resin containing no elastomer is preferable, and a polypropylene resin is particularly preferable. Other fibers may be mixed into the web mainly composed of fibers of the polypropylene resin. For example,
Polyolefin fibers other than polypropylene such as polyethylene, polyester fibers such as PET, polyamide fibers,
Rayon fiber etc. can be mixed. The method for producing the web is not particularly limited. For example, in the case of long fibers, there is a spun bond method, and in the case of short fibers, there is a method of passing staple fibers through a card machine to form a web.

(2) Thermal Fusion Step As one example for making the web obtained above into a nonwoven fabric, a thermal fusion method can be mentioned. In particular,
Hot embossing using an embossing roll is a preferred example. When a web made of polypropylene fiber having a melting point of 160 ° C. is used, the processing temperature is 12
0-160 ° C is preferred. If lower than 120 ° C,
Insufficient fusion causes fuzzing, fraying, and the like. If the temperature is higher than 160 ° C., there is a possibility that the texture may be reduced due to the perforation of the fused portion or the melting of the fibers in the peripheral portion, or the machine may be stopped due to the winding of the raw material around the heat roll.

There is no particular limitation on the pressure-bonding rate at the time of heat fusion, but 3 to 30% is suitable. If it is less than 3%, the fibers may fall off, and if it is more than 30%, the texture may become hard, or the liquid permeability or air permeability may be lowered depending on the application. Although a method of joining fibers other than heat fusion, such as a needle punch method or a water needle method, can be used, it may cause inconveniences such as slow production speed and large scale equipment.

(3) Uniaxial Stretching Step Specific examples of the uniaxial stretching include a roll type stretching method and a tenter type stretching method. When a web made of polypropylene resin fibers having a melting point of 160 ° C. is used, the stretching temperature is preferably 100 to 150 ° C., particularly preferably 120 to 140 ° C. If the temperature is lower than 100 ° C., the raw material is insufficiently stretched and cuts. On the other hand, when the stretching temperature exceeds 150 ° C., the fibers are close to a molten state, and the surface of the stretching roll is transferred to the surface of the nonwoven fabric, resulting in a film-like surface or a hard texture.

The stretching ratio during stretching is preferably 1.4 to 4 times. When the ratio is less than 1.4 times, the orientation (rearrangement) of the fibers due to drawing does not sufficiently occur, and not only the strength in the fiber flow direction (vertical direction in the present application) cannot be obtained, but also the elasticity in the horizontal direction. Is also reduced. If it exceeds 4 times, the raw material may be torn or, if severe, may be broken. Also, at the time of uniaxial stretching, as shown in FIG. 1, the interval (nip distance) between the nip rolls 1 for developing the nonwoven fabric 2 in the heating furnace 3 is preferably 0.5 to 10 times the original fabric width of the unstretched nonwoven fabric. Is 1 to 5 times. If the ratio is less than 0.5 times, a sufficient force to shrink in the horizontal direction is not sufficiently generated, and the film is simply stretched in the longitudinal direction, so that elasticity in the width direction is not generated. If it exceeds 10 times, the force to shrink in the horizontal direction is too strong,
Effective product width cannot be obtained.

[0023]

EXAMPLES The present invention will be described in more detail below with reference to examples. [Example 1] Polypropylene (manufactured by Idemitsu Petrochemical Co., Ltd., Idemitsu Polypro Y6005GM (trade name)) was melt-spun to produce a polypropylene filament having a yarn diameter of 25 µm, and a web having a basis weight of 50 g / m ² was produced from the polypropylene filament. Next, using an embossing roll, this web was subjected to hot embossing at 145 ° C. and a linear pressure of 60 kg / cm to obtain an unstretched raw fabric having a compression rate of 14%. The temperature was 160 ° C. Further, the end portion of the raw fabric was slit to obtain an unstretched raw fabric having a width of 1 m.

Next, this unstretched raw fabric was uniaxially stretched using a uniaxial roll stretching machine under the conditions of a stretching temperature of 130 ° C., a stretching ratio of 2.0 times and a nip roll interval of 1.5 m. A stretched nonwoven fabric was produced. The weight of this non-woven fabric is 4
It was 0 g / m ² . Such manufacturing conditions are summarized in Table 1. The operation stability during this production was good. Moreover, the obtained non-woven fabric had neither fluffing nor fraying, and had no texture hardness.

Next, with respect to the stretched nonwoven fabric of this example, the elongation rate in the longitudinal and transverse directions, 10% elongation recovery rate (S10), and 10% elongation stress (F10) were measured. The results are shown in Table 2.

Table 2 shows the results of evaluation of machine (line) suitability for a diaper manufacturing machine and fastening suitability (suitability of fastening with fastening tape) in this example. Here, the machine suitability for a diaper manufacturing machine is the line suitability from the number of occurrences of troubles and product defects caused by the fastening tape part by running the sample nonwoven fabric on the diaper manufacturing line (200 shots / minute) and operating for 1 hour. Judged. The evaluation is as follows. ◯: Number of troubles 0 △: Number of troubles 1 to 10 ×: Number of troubles 10 or more In the case of the symbols Δ and ×, since the strength in the vertical direction is weak, the raw fabric is pulled on the line and the width fluctuates, resulting in a production trouble. ， A product defect occurred. In addition, the fastening suitability of the obtained diaper in the above diaper manufacturing machine is 1
It was evaluated by the following criteria (especially whether it was easy to fasten with fastening tape) by having 0 mothers and children actually wear it. ○: 8 or more mothers were judged to be good (easy to stop) Δ: 3 to 7 or more mothers were judged to be good (easy to stop) ×: All were judged to be bad (hard to stop)

Example 2 The procedure of Example 1 was repeated, except that a nonwoven fabric was obtained with a draw ratio of 3 times. The basis weight of the nonwoven fabric in this example was 35 g / m ² .

Comparative Example 1 The procedure of Example 1 was repeated except that the stretching temperature was 80 ° C. In this case, the non-woven fabric was cut off and could not be manufactured.

Comparative Example 2 The procedure of Example 1 was repeated except that the stretching temperature was 160 ° C. In this case, the non-woven fabric could not be manufactured due to perforation or cutting due to melting.

[Comparative Example 3] The same procedure as in Example 1 was carried out except that the draw ratio was 1.2 times. The basis weight of the obtained nonwoven fabric was 43 g / m ² .

[Comparative Example 4] The procedure of Example 1 was repeated except that the draw ratio was set to 5. In this case, the non-woven fabric was cut off and could not be manufactured.

[Comparative Example 5] The unstretched original fabric has a basis weight of 80 g /
The procedure was the same as in Example 1 except that the polypropylene spunbonded non-woven fabric of m ² (the same as in Example 1 except for the basis weight) was used and the nip roll interval was 25 cm. The basis weight of the obtained nonwoven fabric was 41 g / m ² .

[Comparative Example 6] The same evaluation as in Example 1 was carried out using an unstretched raw fabric having a basis weight of 50 g / m ² .

Example 3 A polypropylene staple fiber (thread diameter 25 μm, fiber length 52 mm) was passed through a card machine to produce a web having a basis weight of 50 g / m ² . Next, using an embossing roll, the above web was heat-embossed at 145 ° C. and a linear pressure of 60 kg / cm to obtain an unstretched raw fabric having a compression rate of 14%. The melting point of this non-woven fabric is 160
° C. Further, by slitting the end portion of the original fabric, an unstretched original fabric having a width of 1 m was obtained. This was stretched in the same manner as in Example 1 and the same evaluation was performed. The basis weight of the obtained nonwoven fabric was 50 g / m ² .

[Comparative Example 7] Used in the stretching of Example 3,
The same evaluation as in Example 1 was performed on the unstretched nonwoven fabric (area weight: 50 g / m ² ).

[Example 4] PP spunbonded nonwoven fabric ("Stratec" manufactured by Idemitsu Petrochemical Co., Ltd.) RW2030 was drawn at a draw ratio of 2 times, a nip roll interval was 150 cm, and a draw temperature was 13.
Unidirectionally stretchable PP spunbond nonwoven fabric obtained by stretching at 0 ° C. (“Stratec” VW202 manufactured by Idemitsu Petrochemical Co., Ltd.
3, with a basis weight of 23 g / m ² ) and a gather width of 30 m
An hourglass-pants type diaper shown in FIG. 2 having m three-dimensional gathers was manufactured. Next, the height of the three-dimensional gather when the obtained diaper was worn was measured. Unidirectional stretchable PP
The height of the three-dimensional gather of the spunbonded nonwoven fabric was 38 mm as the nonwoven fabric stretched.

[Comparative Example 8] A non-stretchable PP spunbonded non-woven fabric manufactured by the same method as in Example 1 (“Stratec” RW2023 manufactured by Idemitsu Petrochemical Co., Ltd., basis weight 23 g / m 2).
² ) was used to produce a diaper in the same manner as in Example 1. Next, the height of the three-dimensional gather when the obtained diaper was worn was measured. The height of the three-dimensional gather of the non-stretchable PP spunbonded nonwoven fabric was 30 mm.

[0038]

[Table 1]

[0039]

[Table 2]

From the above, the following was found. Examples 1, 2, and 3 have excellent mechanical suitability for a diaper making machine. Even when it is used as a product (diaper), it is easy to stretch in the lateral direction, and the band contracts when tension is released, so it is easy to wear and stop. When used in the three-dimensional gathers, the fourth embodiment improves the standing of the gathers when worn, leading to improved side leakage prevention performance of diapers and sanitary products. Comparative Example 6 is a case where an unstretched raw fabric is used,
The machine suitability for a diaper making machine is poor and it is not suitable for continuous production. The prototype diaper is difficult to stretch in the lateral direction, and if you stretch it forcibly, the band will remain stretched, and it will be difficult to fix it with fastening tape, and it will not be firmly fixed. Comparative Example 3
Has a low draw ratio, and thus the fibers are not sufficiently aligned in the machine direction. Inadequate mechanical suitability for diaper making machines,
Production problems occur, though not as much as unstretched stock. In addition, it is difficult to stretch in the lateral direction, and if you force it to stretch, the band will remain stretched, it will be difficult to stop with fastening tape,
Not firmly fixed. Comparative Example 5 has a short nip roll interval and therefore corresponds to a mere longitudinally stretched nonwoven fabric, but although it has excellent mechanical suitability for a diaper making machine, it is very difficult to stretch in the lateral direction and the band stretched when stretched by force. It will remain as it is, it will be difficult to stop with fastening tape and it will not be fixed firmly. Comparative Example 7 is an example in which an unstretched nonwoven fabric using PP staple fibers is used, and both mechanical suitability and fastening suitability for a diaper manufacturing machine are poor. Comparative Example 8 is an example in which a non-directional non-woven fabric is used for three-dimensional gathers, and the gathering is lower than in Example 4, and the side leakage prevention function is also poor.

[0041]

As described above, according to the present invention, it is possible to provide a nonwoven fabric having elasticity in only one direction, and a simple and efficient production method thereof. When the diaper and sanitary products using the unidirectionally stretchable nonwoven fabric of the present invention are made into three-dimensional gathers, the gathers easily stand in the direction perpendicular to the thread rubber. That is, the height of the gather when the thread rubber at the end of the three-dimensional gather is stretched while wearing the diaper is higher than in the case of the non-stretchable nonwoven fabric, so that the close contact with the body is improved and the side leakage prevention performance is improved. improves.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view schematically showing a configuration of a uniaxially stretching step used in an example of the unidirectionally stretchable nonwoven fabric of the present invention and a method for producing the same.

FIG. 2 is a plan view schematically showing an example of a pants-type diaper using the nonwoven fabric of the present invention.

FIG. 3 is a schematic perspective view showing an example of a pants-type diaper using the nonwoven fabric of the present invention.

[Explanation of symbols]

 1 Nip Roll 2 Nonwoven Fabric 3 Heat Furnace 10 Pants Type Diaper 11 Fastening Tape 12 Leg Gather 13 Three-Dimensional Gather 14 Waist Gather 15 Side Trap 16 Back Sheet

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location A61F 13/18 320 (72) Inventor Toshihide Okuno 4-12-18 Ginza, Chuo-ku, Tokyo Idemitsu Petrochemical Gaku Co., Ltd.

Claims (7)

[Claims] 1. A non-woven fabric composed mainly of thermoplastic resin fibers, wherein the elongation percentage in one direction is 5 to 70%, and the elongation percentage in a direction orthogonal thereto is 100 to 500%. Directionally stretchable nonwoven fabric. 2. The unidirectionally stretchable nonwoven fabric according to claim 1, wherein the unidirectional stretchability is 10% in accordance with JIS-L-1096.
Elongation recovery rate (SMD) and the above 1 in the direction orthogonal to it
A unidirectionally stretchable nonwoven fabric, which has a ratio (SMD / STD) of 0% elongation recovery rate (STD) of 0.9 or less. 3. The unidirectionally stretchable nonwoven fabric according to claim 1, wherein 10% elongation stress (FMD) in accordance with the unidirectional tensile strength measurement method specified in JIS-L-1096.
And the 10% elongation stress (FT
The ratio (FMD / FTD) with D) is 10 or more. 4. (A) A non-woven fabric mainly made of fibers of a thermoplastic resin is prepared, and (B) this unstretched raw fabric is stretched at a temperature 60 ° C. lower than the melting point of the resin to 10 ° C. higher than the melting point.
At a temperature between low temperatures and a draw ratio of 1.4-4.
0, and the nip roll interval is 0.5 to 1 of the unstretched raw fabric width.
A method for producing a unidirectionally stretchable nonwoven fabric, which comprises uniaxially stretching under a condition of 0 times. 5. The unidirectionally stretchable nonwoven fabric according to any one of claims 1 to 4, wherein the thermoplastic resin fiber is a polyolefin resin fiber containing no elastomer component, or a method for producing the same. 6. One of claims 1, 2, 3, and 5
A member for diapers and sanitary products, characterized by using the unidirectionally stretchable non-woven fabric according to item. 7. A diaper and a sanitary article using the member for a sanitary article according to claim 6.