JP2021070884A - Nonwoven fabric and substrate for adhesive skin patch - Google Patents

Abstract

To provide a nonwoven fabric and a substrate for an adhesive skin patch excellent in nonwoven fabric strength in a thickness direction and excellent in adhesive feeling.SOLUTION: A nonwoven fabric comprises highly crimped fibers as a main constituent in which crimping of latent crimpable fibers is developed. The 50% modulus strength per unit basis weight of the nonwoven fabric is 0.020 N/5 cm/(g/m2) or more both in a machine direction and in a cross direction orthogonal to the machine direction. An aspect ratio (MDS/CDS) of the tensile strengths of the nonwoven fabric which is a ratio of a tensile strength (MDS) in the machine direction to the tensile strength (CDS) in the cross direction is 2.0 or more. When the nonwoven fabric is extended by 50% in the machine direction, a shrinkage factor in the cross direction is 20% or less. Thus, it is possible to realize a nonwoven fabric excellent both in nonwoven fabric strength in the thickness direction and in adhesive feeling.SELECTED DRAWING: None

Description

The present invention relates to a non-woven fabric and a patch medicated base material composed of the non-woven fabric.

Conventionally, a non-woven fabric containing crimped fibers having been crimped has been used as a patch medicinal base material, and as such a non-woven fabric, for example, Japanese Patent Application Laid-Open No. 9-87950 (Patent Document 1) has a three-dimensional structure. Elasticity that contains 80% by weight or more of latent crimp fibers that have developed crimps, has a high 50% elongation recovery rate, and has an excellent fit to the body, and has a low 50% modulus strength, which makes it comfortable to wear. Nonwoven fabrics are disclosed.

Japanese Unexamined Patent Publication No. 9-87950

However, the non-woven fabric of Patent Document 1 certainly has an excellent fit to the body, but when used as a medicated base material for patching, for example, the non-woven fabric is destroyed by friction with clothes or the like, or the adhesive strength is increased. When a strong and hard plaster was applied, the non-woven fabric was sometimes destroyed by the applied plaster. Therefore, although it was considered to increase the fiber density for the purpose of increasing the strength of the non-woven fabric in the thickness direction, when the fiber density of the non-woven fabric is increased, the non-woven fabric becomes hard and the skin is used as a medicated substrate for application. The followability to the surface was poor, and the sticking feeling was poor.

The present invention has been made under such circumstances, and an object of the present invention is to provide a non-woven fabric having excellent strength in the thickness direction of the non-woven fabric and having an excellent sticking feeling, and a non-woven fabric for sticking medicinal material.

The invention according to claim 1 of the present invention is "a non-woven fabric mainly composed of highly crimped fibers in which crimping of latent crimpable fibers is exhibited, and 50% of the non-woven fabric in the longitudinal direction and the horizontal direction per unit grain. Both modulus strengths are 0.020 N / 5 cm / (g / m ² ) or more, and the aspect ratio of tensile strength (MDS), which is the ratio of the longitudinal tensile strength (MDS) to the transverse tensile strength (CDS) of the nonwoven fabric (CDS). MDS / CDS) is 2.0 or more, and the non-woven fabric has a shrinkage ratio of 20% or less in the horizontal direction when the non-woven fabric is stretched by 50% in the vertical direction. "

The invention according to claim 2 of the present invention is "the non-woven fabric according to claim 1, wherein the fineness of the highly crimped fiber in which the crimp of the latent crimpable fiber is expressed is 2.0 dtex or less."

The invention according to claim 3 of the present invention is "a patched medicinal base material composed of the non-woven fabric according to claim 1 or 2."

The applicant of the present application has applied that, in a non-woven fabric mainly composed of highly crimped fibers in which crimping of latent crimp fibers is exhibited, the 50% modulus strength in both the longitudinal direction and the horizontal direction per unit grain of the nonwoven fabric is 0.020 N /. The aspect ratio (MDS / CDS) of the tensile strength, which is 5 cm / (g / m ² ) or more and is the ratio of the longitudinal tensile strength (MDS) to the lateral tensile strength (CDS) of the nonwoven fabric, is 2.0. As described above, when the non-woven fabric is stretched by 50% in the vertical direction, the shrinkage ratio in the horizontal direction is 20% or less, so that a non-woven fabric having excellent strength in the thickness direction and a sticking feeling can be realized. I found.

Further, when the fineness of the highly crimped fiber in which the latent crimpable fiber is expressed is 2.0 dtex or less, the constituent fibers of the non-woven fabric are strongly entangled with each other, and the strength in the thickness direction of the non-woven fabric is excellent. Further, it is possible to realize a non-woven fabric having a small shrinkage ratio in the horizontal direction when stretched in the vertical direction and having an excellent sticking feeling.

Further, the non-woven fabric of the present invention is suitable for application to the skin such as a medicated base material for application because it does not easily cause discomfort such as dragging at the time of application.

The non-woven fabric of the present invention is mainly composed of highly crimped fibers in which the crimped latent crimpable fibers are expressed. Since these highly crimped fibers have a large number of crimps and can be stretched when an external force is applied, the non-woven fabric mainly composed of the highly crimped fibers is not only excellent in extensibility, but also has excellent extensibility. When the external force is removed, a force that tries to return the crimp to the original state works, so it has excellent elasticity. For example, when it is used as a patch medicated base material, it can follow the movement of the user when it is attached to the skin. In addition, since the fibers of the highly crimped fibers are well entangled not only in a plane but also in a three-dimensional manner due to the crimping, the non-woven fabric mainly composed of the highly crimped fibers has a strong bond strength between the fibers and is in the thickness direction. It is also excellent in strength.

Examples of the latent crimpable fiber include a composite fiber in which a plurality of resins having different heat shrinkage rates are composited, and a fiber in which a part of the fiber is subjected to a specific heat history. More specifically, as the composite fiber, one having an eccentric core-sheath structure or one having a side-by-side structure can be preferably used.

As a combination of resins having different heat shrinkage rates, various synthetic resins such as polyester-low melting point polyester, polyamide-low melting point polyamide, polyester-polyester, polyester-polypropylene, polypropylene-low melting point polypropylene, and polypropylene-polypropylene are combined. Things can be used. In particular, a latent crimp fiber composed of a combination of polyester-low melting point polyester or polypropylene-low melting point polypropylene is preferable because it is excellent in chemical resistance, extensibility and elasticity. Further, as the latent crimpable fiber in which a part of the fiber is subjected to a specific thermal history, for example, a fiber made of a thermoplastic resin such as polyester or polyamide is passed through one side surface of the fiber while being applied to a hot blade or the like. Can be used.

The fineness of the latent crimpable fibers is not particularly limited, but is 5.5 dtex or less so that the fibers are easily entangled with each other and the adhesion between the fibers is easily increased, so that the non-woven fabric has an excellent texture. It is more preferably 4.4 dtex or less, further preferably 3.3 dtex or less, and further preferably 2.0 dtex or less. On the other hand, if the fineness is too small, the entanglement between the fibers becomes too high and the extensibility tends to be poor. Therefore, 0.5 dtex or more is preferable, and 0.8 dtex or more is more preferable. It is preferably 1.1 dtex or more, and more preferably 1.1 dtex or more.

It is also possible to include two or more types of latent crimp fibers having different fineness. When two or more types of latent crimp fibers having different finenesses are contained in this way, it is preferable that the average fineness calculated by the following formula is within the fineness range. Even when three or more types of latent crimp fibers having different fineness are contained, the value calculated in the same manner is preferably within the fineness range.
Fav = 1 / {(Pa / 100) / Fa + (Pb / 100) / Fb}
Here, Fav is the average fineness (unit: dtex), Pa is the mass ratio of one fiber (fiber A) to the non-woven fabric (unit: mass%), Fa is the fineness of the fiber A (unit: dtex), and Pb is the non-woven fabric. The mass ratio (unit: mass%) of the other fiber (fiber B) to the above, and Fb means the fineness (unit: dtex) of the fiber B, respectively.

The fiber length of the latent crimpable fiber is not particularly limited, but is preferably 110 mm or less, more preferably 64 mm or less, and 51 mm or less so that the fibers can be easily entangled with each other. Is more preferable. The lower limit of the fiber length is not particularly limited, but it is preferably 25 mm or more, and more preferably 30 mm or more so that the fibers are easily entangled with each other and the non-woven fabric has a uniform texture.

It is preferable that the non-woven fabric of the present invention is mainly composed of the highly crimped fibers as described above, but the "main body" includes 50 mass% or more of the highly crimped fibers in which the latent crimpable fibers are crimped. The more highly crimped fibers are, the more excellent the extensibility and elasticity are. Therefore, it is more preferable to contain 70 mass% or more, further preferably 90 mass% or more, and 100 mass% high crimped fibers. Most preferably.

In the non-woven fabric of the present invention, since the 50% modulus strength in the vertical direction and the horizontal direction per unit grain is 0.020 N / 5 cm / (g / m ² ) or more, the fibers are well entangled with each other. When the non-woven fabric of the present invention is used as a patch medicated base material because of its excellent strength in the thickness direction, the non-woven fabric is not easily destroyed by the non-woven fabric even when a highly adhesive plaster is used, and when the non-woven fabric is peeled off during use. In addition, peeling is less likely to occur between layers of the non-woven fabric.

The "longitudinal direction" in the present invention refers to the production direction during the production of the non-woven fabric, whereas the "horizontal direction" in the present invention refers to the direction orthogonal to the production direction (longitudinal direction) during the production of the non-woven fabric. Say.

Further, in the present invention, "50% modulus strength per unit basis weight" is a quotient obtained by dividing the 50% modulus strength by the basis weight, and the basis weight means the mass per fixed area. Therefore, a large basis weight means a large mass and a large amount of fibers, and a small basis weight means a small mass and a small amount of fibers. This is to eliminate the effect. The "Metsuke" is the mass per ^{1 m 2 on} the widest surface of the non-woven fabric.

Furthermore, for "50% modulus strength", a sample piece with a width of 50 mm and a length of 300 mm is sampled from a non-woven fabric, and a Tencilon universal material tester (manufactured by A & D Co., Ltd.) is used to grab the sample piece at an interval of 200 mm. After fixing with, measure the maximum load until 100 mm (= 50%) extension (grasping interval: 300 mm). This maximum load is measured for three sample pieces, and these maximum loads are arithmetically averaged to obtain a 50% modulus strength. The measurement is performed under the condition of a tensile speed of 500 mm / min.

The higher the 50% modulus strength in the vertical direction per unit grain, the more the fibers are entangled with each other and the strength in the thickness direction of the non-woven fabric is superior. Therefore, 0.021 N / 5 cm / (g / m ² ) or more. Is more preferable, and 0.025 N / 5 cm / (g / m ² ) or more is further preferable. On the other hand, since the extensibility of the non-woven fabric may deteriorate, the upper limit is realistically 0.200 N / 5 cm / (g / m ² ) or less. Similarly, the higher the lateral 50% modulus strength per unit basis weight, the better the strength in the thickness direction of the non-woven fabric. Therefore, 0.021 N / 5 cm / (g / m ² ) or more is more preferable. More preferably 0.025 N / 5 cm / (g / m ² ) or more. On the other hand, since the extensibility of the non-woven fabric may deteriorate, the upper limit is realistically 0.100 N / 5 cm / (g / m ² ) or less.

The non-woven fabric of the present invention has a tensile strength aspect ratio (MDS / CDS) of 2.0 or more, which is the ratio of the longitudinal tensile strength (MDS: Machine Direction Strength) to the lateral tensile strength (CDS: Cross Direction Strength). Then, it was found that the strength of the non-woven fabric in the thickness direction is excellent. Although the reason for this has not been completely clarified, the difference in tensile strength between the longitudinal direction and the lateral direction is presumed to have some degree of fiber orientation in the longitudinal direction in the non-woven fabric, and a certain amount of fiber. It is presumed that the more oriented the fibers are, the better the fibers are entangled with each other.

The higher the aspect ratio (MDS / CDS) of the tensile strength, the better the strength in the thickness direction of the non-woven fabric tends to be. Therefore, 2.1 or more is more preferable, 2.2 or more is more preferable, while if it is too high, the fiber Is oriented in one direction, and when it is extended by 50% in the vertical direction, which will be described later, the shrinkage rate in the horizontal direction tends to be high. Therefore, the upper limit is realistically 2.5 or less.

The tensile strength is a value measured under the following conditions according to JIS L 1913: 2010 6.3 (ISO method) 6.3.1 (standard time).
Width of test piece: 5 cm
Distance between chucks: 200 mm
Tensile rate: 500 mm / min

The tensile strength in the vertical direction is not particularly limited, but is preferably 30 to 150 N / 5 cm, more preferably 45 to 135 N / 5 cm, and even more preferably 60 to 120 N / 5 cm. The tensile strength in the lateral direction is also not particularly limited, but is preferably 10 to 70 N / 5 cm, more preferably 20 to 60 N / 5 cm, and even more preferably 30 to 50 N / 5 cm.

The non-woven fabric of the present invention has a shrinkage rate of 20% or less in the horizontal direction when stretched by 50% in the vertical direction, so that it does not shrink easily when the non-woven fabric is pulled. In particular, it has an excellent sticking feeling.
The reason why the evaluation is based on the shrinkage rate in the horizontal direction when the non-woven fabric is stretched by 50% in the vertical direction is that the non-woven fabric is evaluated in the vertical direction in which the tensile strength is relatively strong when the non-woven fabric is used as a patch medicated base material. This is for comparison in terms of physical properties in the above-mentioned application because it is stretched and pasted.

When this non-woven fabric is stretched by 50% in the vertical direction, the shrinkage ratio in the horizontal direction is as follows: A sample piece of 50 mm in the horizontal direction and 300 mm in the vertical direction is sampled from the non-woven fabric, and a Tencilon universal material tester (A & D Co., Ltd.) After fixing the sample pieces at a grip interval of 200 mm, the sample pieces are extended by 100 mm (= 50%) (grasping interval: 300 mm), and the lateral length L (unit: mm) at this time is measured. The measurement of the lateral length L is performed on three test pieces, and these lateral lengths L are arithmetically averaged and substituted into the following equation to obtain the lateral shrinkage ratio.
Lateral shrinkage rate (%) = {(50-L) / 50} x 100
The measurement is performed under the condition of a tensile speed of 500 mm / min.

The non-woven fabric of the present invention is easily stretchable, but the elongation rate is preferably 100% or more in both the vertical direction and the horizontal direction, more preferably 125% or more, and further preferably 150% or more. ..

This elongation rate (Sr, unit:%) is the elongation of the sample piece at the maximum load (Smax, unit: mm) [= (length at maximum load, unit) when the above-mentioned tensile strength measurement is performed. : Mm)-(Grip interval = 200 mm)] means the percentage of the grip interval (200 mm). That is, it is a value obtained from the following equation. This measurement is performed three times, and the arithmetic mean value of the percentage is taken as the growth rate.
Sr = (Smax / 200) x 100

The fibers other than the highly crimped fibers in which the latent crimpable fibers constituting the non-woven fabric are expressed are not particularly limited, but the latent crimpable fibers are not impaired in the extensibility and elasticity of the non-woven fabric. Fibers that do not fuse due to the action of heat when developing crimps are preferable, and for example, polyester fibers (polyethylene terephthalate fiber, polybutylene terephthalate fiber, polytrimethylene terephthalate fiber, etc.), polyolefin fibers (polyethylene fiber). , Polypropylene fiber, etc.), polyamide fiber (6 nylon fiber, 66 nylon fiber, etc.), polyvinyl alcohol fiber, synthetic fiber such as acrylic fiber, or cellulose fiber such as cotton and rayon.

The constituent fibers (highly crimped fibers) of the non-woven fabric of the present invention can be white, but may contain fibers colored with a pigment and / or fibers dyed with a dye in addition to white. For example, when it is used as a medicated base material for application, it is preferable that it is colored in skin color because it is inconspicuous when it is applied to the skin.

The non-woven fabric of the present invention may have a crimping portion. If the pressure-bonded portion has information on the source, medicinal properties, design, etc., the non-woven fabric can recognize the information. This "crimping portion" is a portion where the fibers are not fused, although the degree of adhesion of the fibers is higher than that of other regions. As described above, since the fibers are not fused, the non-woven fabric is excellent in extensibility and elasticity. When the crimping portion is provided, the total area of the crimping portion of the non-woven fabric is preferably 40% or less, more preferably 20% or less of the area of the non-woven fabric so as to be excellent in extensibility and elasticity. It is more preferably 10% or less. On the other hand, when the crimping portion acts as an information source, the total area of the crimping portion of the non-woven fabric is 5% of the area of the non-woven fabric because it is preferably a certain size so that the information can be easily recognized. The above is preferable.

The basis weight of the non-woven fabric of the present invention is not particularly limited, but it is ^{preferably 30 g / m 2} or more, and more preferably 40 g / m ² or more so that the non-woven fabric has an excellent texture. On the other hand, if the basis weight is too high, the extensibility tends to deteriorate. Therefore, it is preferably ^{150 g / m 2 or less, more preferably 130 g / m 2} or less, and 110 g / m ² or less. Is more preferable.

The thickness of the non-woven fabric is not particularly limited, but if the thickness is too thin, the fibers tend to adhere to each other too much and the elasticity tends to deteriorate. Therefore, the thickness is preferably 0.30 mm or more. , 0.40 mm or more is more preferable. On the other hand, if the thickness is too thick, the fibers are not sufficiently entangled with each other and the tensile strength and wear resistance tend to be weakened. Therefore, the thickness is preferably 1.50 mm or less, preferably 1.00 mm or less. It is more preferably 0.90 mm or less, and further preferably 0.90 mm or less. The "thickness" refers to a value measured using a compressive elasticity tester under the conditions of a contact area of 5 cm ² and a load of 0.98 N {100 gf}.

The method for producing the non-woven fabric of the present invention is not particularly limited, but for example, (1) a step of forming a fiber web mainly composed of latent crimp fibers, and (2) binding the fiber web constituent fibers to each other. Later, it is produced by a step of expressing the crimp of the latent crimp fiber or (2') a step of binding the fiber web constituent fibers to each other after expressing the crimp of the latent crimp fiber. be able to.

More specifically, (1) the step of forming a fiber web mainly composed of latent crimp fibers (50 mass% or more) is, for example, a dry method such as a card method or an air array method, a wet method, or a spunbond method. It can be formed by a direct method such as. When it is necessary to prevent the plaster from seeping out to the surface opposite to the coated surface, such as a patch medicated base material such as a poultice or plaster, it is preferable that the plaster has a certain thickness. It is preferable to form the fiber web by a dry method, which is easy to form a relatively bulky fiber web. In addition, these fiber webs can also be laminated. As the latent crimpable fiber, the above-mentioned latent crimpable fiber can be used.

The orientation directions of the fiber web constituent fibers include, for example, a vertically oriented parallel web, a unidirection web, a cross ray web in which the parallel web is horizontally oriented by a cross layer or the like, and a parallel web and a cross ray web. It can be a laminated Chris Cross web or a random web. Among these, a random web is preferable because it is easy to produce a non-woven fabric that satisfies the constitution of the present invention and is excellent in strength and sticking feeling in the thickness direction of the non-woven fabric.

Then, (2) a step of expressing the crimping of the latent crimping fiber after binding the fiber web constituent fibers to each other, or (2') after expressing the crimping of the latent crimping fiber. The nonwoven fabric of the present invention can be produced by carrying out the step of binding the fiber web constituent fibers to each other.

The method of binding the fiber web constituent fibers to each other is not particularly limited, but in order to produce a non-woven fabric having excellent extensibility, the fibers are entangled by water flow entanglement or needle punching to bond the fiber web constituent fibers to each other. Is preferable. In particular, in the case of water flow entanglement, since the fibers are sufficiently entangled with each other, the strength in the thickness direction of the non-woven fabric is high, delamination is difficult, and it is easy to manufacture a non-woven fabric having excellent wear resistance, which is preferable.

In the case of suitable water flow entanglement, the 50% modulus strength per unit grain is 0.020 N / 5 cm / (g / m ² ) or more, that is, the fibers are sufficiently entangled with each other. It is preferable to apply a water flow having a water flow of 1.5 MPa or more once so that the strength of the non-woven fabric in the thickness direction is high and delamination is difficult. The higher the water pressure, the better the above-mentioned action. Therefore, it is more preferable to apply a water flow having a water pressure of 2.0 MPa or more. If the water pressure is too strong, the extensibility tends to deteriorate, so it is preferably 12 MPa or less. Further, it is preferable that the action of the water flow is twice or more so that the fibers are sufficiently entangled with each other. Further, the water stream preferably acts on both sides of the fiber web. In addition, the support supporting the fiber web used during water flow entanglement is a 50-100 mesh plastic or metal plain weave net, twill net, or mesh so as not to disturb the texture of the non-woven fabric. It is preferable to use a screen.

The expression of crimping of latent crimp fibers can be carried out, for example, by applying heat to a fiber web (including a fiber web in which fibers are bonded to each other, the same applies hereinafter). Due to the occurrence of this crimping, it is possible to obtain a non-woven fabric having excellent wear resistance and having a shrinkage rate of 20% or less in the horizontal direction when the non-woven fabric is stretched by 50% in the vertical direction and which is hard to shrink by an external force. As possible, it is preferable to shrink the fiber web by 20 to 70%, more preferably 25 to 65%, and even more preferably 30 to 60% in both the longitudinal direction and the transverse direction of the fiber web. ..

The percentage of shrinkage (Sr) is as follows, where Lb is the length of the fiber web in the longitudinal or horizontal direction before shrinkage and La is the length of the fiber web in the longitudinal or horizontal direction after shrinkage. It is a value calculated from the formula. For example, when a fiber web having a length of 100 cm in the longitudinal direction is reduced to a length of 90 cm in the longitudinal direction, the percentage of contraction is 10%.
Sr = [(Lb-La) / Lb] × 100

As described above, in order to contract in both the vertical direction and the horizontal direction, for example, it can be carried out by applying heat so as to overfeed in the vertical direction and not hinder the contraction in the horizontal direction. The heat for the fiber web can be applied while being conveyed by a conveyor or the like.

The heat acting on the fiber web is not particularly limited as long as it is heat that allows the latent crimp fibers to exhibit crimping, and the temperature differs depending on the latent crimp fibers. This temperature can be set experimentally and appropriately depending on the latent crimpable fiber.

The heating means is not particularly limited, and examples thereof include a hot air dryer, an infrared lamp, and a heating roll. However, it is preferable to develop crimping and shrink the fibers in the vertical and horizontal directions. , It is preferable to use a heating means that does not inhibit the shrinkage of latent crimp fibers.

In the present invention, (2) the crimps of the latent crimp fibers may be developed after binding the fiber web constituent fibers to each other, or (2') the crimps of the latent crimp fibers may be developed. After the fibers are expressed, the fiber web constituent fibers may be bonded to each other, but as in the former (2), after the fiber web constituent fibers are bonded to each other, the latent crimpable fibers may be crimped. , It is more preferable because a non-woven fabric having more excellent elasticity can be produced.

Further, in the present invention, in order to add further value to the nonwoven fabric, post-processes such as coloring treatment, embossing treatment, and / or printing treatment can be carried out.

The coloring treatment can be a treatment of coloring the non-woven fabric with a pigment or a dyeing treatment. It should be noted that the non-woven fabric can also be produced by using the fibers colored with the pigment or the dyed fibers.
The embossing treatment is preferably carried out by crimping the non-woven fabric constituent fibers without fusing them. This is because if the fibers are fused, the highly crimped fibers and the like tend to be fused, and sufficient extensibility and elasticity cannot be exhibited. In order not to fuse the fibers, the temperature in the embossing apparatus is set to a temperature lower than the melting point of the resin component having the lowest melting point among the non-woven constituent fibers, preferably a temperature lower than the melting point by 30 ° C. or more, more preferably. The temperature is 50 ° C. or higher lower than the melting point. On the other hand, when information is given to the non-woven fabric by crimping, embossing is performed at a temperature higher than the glass transition temperature of the resin component having the highest glass transition temperature among the non-woven fabric constituent fibers so that the information can be clearly recognized. It is preferable to do so.

In the printing process, characters and figures can be printed on the surface of the non-woven fabric by a general printing method such as gravure printing, offset printing, and inkjet printing. As the ink to be printed, for example, an inorganic pigment, an organic pigment, and an organic dye can be used alone or in combination. By printing in this way, it is possible to add information to the non-woven fabric and improve the design as in the case of embossing.

Examples of the present invention will be described below, but the present invention is not limited to the following examples.

(Example 1)
Using 100 mass% of latent crimpable fibers (fineness: 1.3 dtex, fiber length: 44 mm) configured in a side-by-side type by a combination of polyester (melting point: 250 ° C.) / low melting point polyester (230 ° C.), by a card machine. The fibers were opened to form a random web.
This random web was entangled by a water stream to form a water flow entangled fiber web. The water flow entanglement conditions were as follows.
1. 1. Shower: 1.0 MPa [one side (A side)]
2. 1.5 MPa (A side) from a nozzle plate with a nozzle diameter of 0.12 mm and a nozzle pitch of 0.6 mm
3. 3. 2.0 MPa (A side) from a nozzle plate with a nozzle diameter of 0.12 mm and a nozzle pitch of 0.6 mm
4. 2.0 MPa from a nozzle plate with a nozzle diameter of 0.12 mm and a nozzle pitch of 0.6 mm [the other side (B side)]
5. 2.5 MPa (A side) from a nozzle plate with a nozzle diameter of 0.12 mm and a nozzle pitch of 0.6 mm
Next, when the water flow entangled fiber web is dried and then the water flow entangled fiber web is heat-treated with a hot air dryer to develop the crimp of the latent crimp fiber to form a highly crimped fiber. The water flow entangled web was shrunk by 50.0% in the vertical direction and 34.4% in the horizontal direction to produce a non-woven fabric. The physical characteristics of this non-woven fabric are as shown in Table 1.

(Example 2)
A non-woven fabric was produced in the same manner as in Example 1 except that the basis weight and the thickness were different. The physical characteristics of this non-woven fabric are as shown in Table 1.

(Comparative Example 1)
Using 100 mass% of latent crimp fibers similar to those in Example 1, the fibers were opened by a carding machine to form a random web.
This random web was entangled by a water stream to form a water flow entangled fiber web. The water flow entanglement conditions were as follows.
1. 1. Shower: 1.0 MPa [one side (A side)]
2. 1.5 MPa (A side) from a nozzle plate with a nozzle diameter of 0.12 mm and a nozzle pitch of 0.6 mm
3. 3. 2.0 MPa (A side) from a nozzle plate with a nozzle diameter of 0.12 mm and a nozzle pitch of 0.6 mm
4. 2.0 MPa from a nozzle plate with a nozzle diameter of 0.12 mm and a nozzle pitch of 0.6 mm [the other side (B side)]
5. 2.5 MPa (A side) from a nozzle plate with a nozzle diameter of 0.12 mm and a nozzle pitch of 0.6 mm
Next, when the water flow entangled fiber web is dried and then the water flow entangled fiber web is heat-treated with a hot air dryer to develop the crimp of the latent crimp fiber to form a highly crimped fiber. The water flow entangled web was shrunk by 43.2% in the vertical direction and 34.0% in the horizontal direction to produce a non-woven fabric. The physical characteristics of this non-woven fabric are as shown in Table 1.

(Comparative Example 2)
Using 100 mass% of latent crimp fibers similar to those in Example 1, the fibers were opened by a carding machine to form a crosslay web.
This crosslay web was entangled by a water stream to form a water flow entangled fiber web. The water flow entanglement conditions were as follows.
1. 1. Shower: 1.0 MPa [one side (A side)]
2. 1.5 MPa (A side) from a nozzle plate with a nozzle diameter of 0.12 mm and a nozzle pitch of 0.6 mm
3. 3. 2.0 MPa (A side) from a nozzle plate with a nozzle diameter of 0.12 mm and a nozzle pitch of 0.6 mm
4. 2.5 MPa from a nozzle plate with a nozzle diameter of 0.12 mm and a nozzle pitch of 0.6 mm [the other side (B side)]
Next, when the water flow entangled fiber web is dried and then the water flow entangled fiber web is heat-treated with a hot air dryer to develop the crimp of the latent crimp fiber to form a highly crimped fiber. The water flow entangled web was shrunk by 44.4% in the vertical direction and 45.1% in the horizontal direction to produce a non-woven fabric. The physical characteristics of this non-woven fabric are as shown in Table 1.

(Comparative Example 3)
Using 100 mass% of latent crimp fibers (fineness: 2.2 dtex, fiber length: 51 mm) configured in a side-by-side type by a combination of polyester (melting point: 250 ° C.) / low melting point polyester (230 ° C.), by a card machine. The fibers were opened to form a random web.
This random web was entangled by a water stream to form a water flow entangled web. The water flow entanglement conditions were as follows.
1. 1. Shower: 1.5MPa [one side (A side)]
2. 4.0 MPa (A side) from a nozzle plate with a nozzle diameter of 0.13 mm and a nozzle pitch of 0.6 mm
3. 3. 4.5 MPa (A side) from a nozzle plate with a nozzle diameter of 0.13 mm and a nozzle pitch of 0.6 mm
4. 6.5 MPa from a nozzle plate with a nozzle diameter of 0.13 mm and a nozzle pitch of 0.6 mm [the other side (B side)]
5. 4.0 MPa (A side) from a nozzle plate with a nozzle diameter of 0.13 mm and a nozzle pitch of 0.6 mm
Next, when the water flow entangled fiber web is dried and then the water flow entangled fiber web is heat-treated with a hot air dryer to develop the crimp of the latent crimp fiber to form a highly crimped fiber. The water flow entangled web was shrunk by 35.4% in the vertical direction and 18.4% in the horizontal direction to produce a non-woven fabric. The physical characteristics of this non-woven fabric are as shown in Table 1.

(Comparative Example 4)
Using 100 mass% of latent crimp fibers similar to those in Comparative Example 3, the fibers were opened by a carding machine to form a unidirection web.
This unidirection web was entangled by a water stream to form a water flow entangled web. The water flow entanglement conditions were as follows.
1. 1. 3.0 MPa from a nozzle plate with a nozzle diameter of 0.13 mm and a nozzle pitch of 0.6 mm [one side (A side)]
Next, when the water flow entangled fiber web is dried and then the water flow entangled fiber web is heat-treated with a hot air dryer to develop the crimp of the latent crimp fiber to form a highly crimped fiber. The water flow entangled web was shrunk by 45.8% in the vertical direction and 28.6% in the horizontal direction to produce a non-woven fabric. The physical characteristics of this non-woven fabric are as shown in Table 1.

In addition, the nonwoven fabrics of Examples and Comparative Examples were evaluated by the following methods.

(Strength test in the thickness direction of non-woven fabric)
(1) The non-woven fabrics of Examples and Comparative Examples are laminated with the adhesive surface of 5 cm x 15 cm kraft tape (manufactured by ASKUL Corporation, on-site power laminating kraft tape), and the kraft tape is reciprocated with a roller with a load of 500 g. I pressed the entire surface of.
(2) The kraft tape was peeled off at a speed of 100 mm per minute, and the evaluation was performed according to the following criteria from the results of observing the fiber adhesion state on the adhesive surface of the kraft tape.
(Evaluation criteria for strength in the thickness direction of non-woven fabric)
1: No fibers adhered to the adhesive surface of the kraft tape 2: Although there are fibers attached to the adhesive surface of the kraft tape, the area where the fibers adhere to the adhesive surface of the kraft tape is 20% or less of the total 3: The area where fibers are attached on the adhesive surface of kraft tape exceeds 20% and is 50% or less of the whole 4: The area where fibers are attached on the adhesive surface of kraft tape exceeds 50% of the whole

(Attachment sensory test)
(1) A pressure-sensitive adhesive (MAS-811B, manufactured by Cosmed Pharmaceutical Co., Ltd.) was spread on a silicone-coated PET film to a length of 100 μm after drying, and dried.
(2) The non-woven fabrics of Examples and Comparative Examples and the surface of the PET film in which the adhesive was spread in (1) having the adhesive are bonded together, and the temperature is set to 100 ° C., the load is 0.1 MPa, and the processing temperature is set to 10 seconds. A laminate was produced in which the pressure-sensitive adhesive was transferred to a non-woven fabric by passing it through a low-temperature adhesive (JP-1000 LTS manufactured by Asahi Textile Machinery Co., Ltd.).
(3) The laminate of (2) was punched into a rectangle 10 cm in the vertical direction and 7 cm in the horizontal direction to prepare an evaluation sample.
(4) Peel off the PET film of the sticking sample and stick it on the elbows of 5 people in their 20s and 40s so that the adhesive and the skin adhere to each other, evaluate according to the following criteria, and perform the arithmetic mean value (decimal point) of the evaluation. (Up to the first place) was sought.
(Evaluation criteria for sticking sensory test)
1: No discomfort when pasting the evaluation sample 2: Feeling some tension when pasting the evaluation sample 3: Feeling tension when pasting the evaluation sample

Physical properties of the non-woven fabrics of Examples and Comparative Examples: grain size, thickness, 50% modulus strength, 50% modulus strength per unit grain, tensile strength, aspect ratio of tensile strength, laterality when stretched by 50% in the vertical direction The shrinkage rate in the direction (= horizontal shrinkage rate when stretched by 50% in the vertical direction), the elongation rate, and the evaluation result of the non-woven fabric (strength test result in the thickness direction of the non-woven fabric, arithmetic average value of the sticking feeling sensory test result) are shown. It is shown in Table 1 below.

From the comparison between the non-woven fabrics of Examples and the non-woven fabrics of Comparative Examples 1 and 3, when the shrinkage ratio in the horizontal direction when stretched by 50% in the vertical direction is 20% or less, the non-woven fabric is stretched in the vertical direction. It was found that the non-woven fabric does not easily shrink in the lateral direction and has an excellent sticking feeling.

Further, from the comparison between the non-woven fabrics of Examples and the non-woven fabrics of Comparative Examples 2 and 4, the aspect ratio of tensile strength (MDS / CDS) is 2.0 or more, and the 50% modulus strength per unit number is 0. It was found that when the content was 020 N / 5 cm / (g / m ² ) or more, the non-woven fabric had excellent strength in the thickness direction of the non-woven fabric.

Since the non-woven fabric of the present invention is excellent in strength and sticking feeling in the thickness direction of the non-woven fabric, for example, a plaster containing a medicinal ingredient is applied to form an external patch (pap agent, plaster agent, etc.). It can be suitably used as a patch medicinal base material for applying a medicinal base material or a cosmetic gel to form a facial pack.

Claims (3)

It is a non-woven fabric mainly composed of highly crimped fibers in which the crimps of latent crimpable fibers are expressed.
The 50% modulus strength in both the vertical direction and the horizontal direction per unit basis weight of the non-woven fabric is 0.020 N / 5 cm / (g / m ² ) or more.
The aspect ratio (MDS / CDS) of the tensile strength, which is the ratio of the tensile strength (MDS) in the longitudinal direction to the tensile strength (CDS) in the lateral direction of the nonwoven fabric, is 2.0 or more.
A non-woven fabric having a shrinkage rate of 20% or less in the horizontal direction when the non-woven fabric is stretched by 50% in the vertical direction. The non-woven fabric according to claim 1, wherein the highly crimped fiber in which the latent crimpable fiber is crimped has a fineness of 2.0 dtex or less. A patch medicated base material composed of the non-woven fabric according to claim 1 or 2.