TWI565846B - A nonwoven fabric, an absorbent article containing the nonwoven fabric, and a method of manufacturing the nonwoven fabric - Google Patents

Description

Non-woven fabric, absorbent article containing the same, and method of manufacturing the nonwoven fabric

The present invention relates to a method of manufacturing a first ridge groove region on the same surface, a non-woven fabric in the second ridge groove region, an absorbent article including the nonwoven fabric, and the nonwoven fabric.

Non-woven fabrics are used for absorbent articles, and can be used, for example, in physiological products and disposable disposable diapers; cleaning articles such as wipes; and medical articles such as articles such as masks. However, in such products, non-woven fabrics having properties suitable for the use of the product, the parts used, and the like are often used.

For example, in the absorbent article, it is required to have a stretchable non-woven fabric that does not cause discomfort to the user, and can be used in conjunction with the movement of the body at the time of wearing or use. Further, the disposable disposable diaper has high stretchability and has such strength that it does not break when stretched, and requires a non-woven fabric having good skin feel and good air permeability.

In such products, non-woven fabrics having desired properties are designed and manufactured for each product. If desired, the desired properties can be easily produced by processing a commercially available nonwoven fabric. The non-woven fabric is ideal from the viewpoints of manufacturing cost and environmental protection. Further, in the commercially available non-woven fabric, if the non-woven fabric having different structures and properties depending on the portion can be produced by applying different processing depending on the portion, the non-woven fabric should be made more highly functional.

Non-woven fabric is used as a raw material, and it is suitable for use as an absorbent article. For example, Patent Document 1 discloses an absorbent article including a liquid-permeable surface sheet, a liquid-impermeable back sheet, and a liquid-retaining absorbent body interposed between the sheets. In the absorbent article, the laminated sheet of the skin abutting surface has a plurality of concave and convex portions which are regularly formed, and a convex portion which is formed to have a lower height than the convex portion in the uneven portion or is not formed into a convex portion. Non-concave area of the part. The laminated sheet described in Patent Document 1 is laminated on the first layer on the skin side; and the second layer disposed on the side of the absorber is formed by shrinking the second layer to form a concave-convex region; region.

Further, Patent Document 2 discloses a non-woven fabric in which a ridge portion and a groove portion extending in one direction are alternately formed and having a hole in the groove portion, wherein the ridge portion has a substantially larger amount of fibers than the groove portion, and the ridge portion is provided. The top of the opening and the end of the opening form a non-woven fabric having a different fiber density. Further, in [0048] of Patent Document 2, a nonwoven fabric in which fiber bonding and entanglement can be used is described as a raw material.

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2003-275239

[Patent Document 2] Japanese Patent Laid-Open No. 2009-62650

However, the absorbent article described in Patent Document 1 is because Since the uneven portion and the non-concave portion are formed in such a manner that the laminated sheet portion is shrunk, the amount of the material increases, and the engineering increases, which is disadvantageous to the cost. Further, since the thickness of the formed laminated sheet is increased, the air permeability in the thickness direction tends to be lowered.

Further, in the nonwoven fabric described in Patent Document 2, for example, when a commercially available nonwoven fabric is used as a raw material, since the nonwoven fabric is fixed to the nonwoven fabric and is not easily moved, it is necessary to increase the energy of the fluid treatment. When a steam flow or an air flow is used as the fluid treatment, it is necessary to raise the fluid treatment temperature, but by increasing the treatment temperature, the fibers in the nonwoven fabric are fused, the flexibility of the produced nonwoven fabric is lowered, and it is difficult to form a desired one. structure.

Further, when a water flow is used as the fluid treatment, a drying process is further required. Further, in the nonwoven fabric described in Patent Document 2, a card web may be used as a raw material, but when a card web is used as a raw material, the structure of the produced sheet is likely to be disordered, so that the attraction force at the time of fluid treatment is improved. The necessity arises to make the manufacturing equipment bigger.

In addition, in the nonwoven fabric described in Patent Document 2, the structure and properties of the nonwoven fabric are changed depending on the position, and there is no description or disclosure.

Accordingly, the present invention has an object of providing a nonwoven fabric which can be easily manufactured and which has a different structure depending on a region.

In order to solve the above problems, the inventors of the present invention have made an effort to review a non-woven fabric including a first ridge groove region and a second ridge groove region on the same surface, wherein the first ridge groove region includes: plural First ridge And a plurality of first groove portions, the second ridge groove region includes: a plurality of second ridge portions; and a plurality of second groove portions, wherein a height of the ridges of the first ridge portion is higher than a height of the ridges of the second ridge portion The aspect in which the diameter of the fiber in the first ridge region is smaller than the diameter of the fiber in the second ridge region has been found to solve the above problems, and the present invention has been completed.

Specifically, the present invention relates to the following aspects.

[Scenario 1]

A non-woven fabric is a non-woven fabric including a first ridge groove region and a second ridge groove region on the same surface, wherein the first ridge groove region includes: a plurality of first ridge portions; and a plurality of first groove portions, and a second The ridge groove region includes: a plurality of second ridges; and a plurality of second ridge portions, wherein the height of the ridges of the first ridge portion is higher than the height of the ridges of the second ridge portion, and the diameter ratio of the fibers in the first ridge portion The diameter of the fibers in the second ridge region is finer.

[Surface 2]

In the nonwoven fabric according to the first aspect, the first ridge portion and the first groove portion are arranged in parallel and alternately.

[Surface 3]

In the nonwoven fabric according to the second aspect, the second ridge portion and the second groove portion are alternately arranged in parallel with each other, and are parallel to the first ridge portion and the first groove portion.

[Surface 4]

The non-woven fabric according to any one of the aspects 1 to 3, wherein the amount of fibers in the first ridge portion is larger than the amount of fibers in the first groove portion.

[Surface 5]

The non-woven fabric according to any one of the aspects 1 to 4, wherein the first ridge groove region and the two second ridge groove regions adjacent to the first ridge groove region are formed.

[Figure 6]

The non-woven fabric according to any one of the aspects 1 to 5, wherein the first ridge region is more excellent in liquid permeability than the second ridge region, and the second ridge region is superior to the first ridge region in liquid suction property.

[Stage 7]

The non-woven fabric according to any one of the aspects 1 to 6, wherein the nonwoven fabric is composed of a single layer.

[Surface 8]

An absorbent article comprising: a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent article of an absorbent body between the upper sheet and the back sheet, wherein The above-mentioned sheet is formed of the nonwoven fabric described in any of the aspects 1 to 7.

[Surface 9]

A method for producing a non-woven fabric, which is a method for producing a non-woven fabric according to any one of the aspects 1 to 7, wherein the method includes: preparing a non-woven fabric to be processed, and extending a part of the non-woven fabric to be processed unevenly Forming a region having a high extension portion and a low extension portion, and forming a step comprising: a region having a high extension portion and a low extension portion, and a non-woven region with a non-extended region, and comprising: having the above-mentioned high extension portion and low extension portion The non-woven fabric of the region and the non-extended region is disposed on the support, and then the step of blowing the discharged fluid with the region having the above-mentioned high-extension portion and the low-extension portion; and the two regions of the non-extended region.

[Surface 10]

The method for producing a nonwoven fabric according to the aspect 9, wherein the step of forming the region including the high-extension portion and the low-extension portion and the non-woven fabric in the non-extended region is a step having a rotation axis orthogonal to the conveyance direction In the pair of gear rolls, a part of the non-woven fabric to be processed is made to have a plurality of teeth arranged on the outer peripheral surface of the gear roll mesh with each other while being engaged with each other.

[Stage 11]

The manufacturing method of the nonwoven fabric according to the tenth aspect, wherein the plurality of tooth systems are disposed on the outer peripheral surface perpendicular to the rotation axis, and the region having the high extension portion and the low extension portion is formed in a direction opposite to the conveyance direction. The orthogonal directions of the intersections alternately have a non-woven fabric having a high extension portion and a low extension portion parallel to the conveyance direction, or the plurality of tooth systems are disposed on the outer circumferential surface in parallel with the rotation axis, and have the high extension portion and the low portion The region of the extended portion is formed with a non-woven fabric having a high extension portion and a low extension portion which are alternately arranged in a direction parallel to the conveyance direction, respectively, in the conveyance direction.

[Surface 12]

The method for producing a nonwoven fabric according to the aspect 10 or the aspect 11, wherein the non-woven fabric to be treated is selected from the group consisting of a hot air non-woven fabric, a spunbonded nonwoven fabric, and a stretch nonwoven fabric.

[Stage 13]

The method for producing a nonwoven fabric according to any one of the aspects 9 to 12, wherein the fluid system is selected from the group consisting of air, water vapor, and water.

The nonwoven fabric of the present invention is easily manufactured and has a different structure depending on the region.

[Formation for carrying out the invention]

Hereinafter, the nonwoven fabric including the first ridge groove region and the second ridge groove region of the present invention on the same surface will be described in detail.

Fig. 1 is a perspective view showing an embodiment of a non-woven fabric including a first ridge groove region and a second ridge groove region of the present invention on the same surface. As shown in Fig. 1, the nonwoven fabric 1 including the first ridge groove region and the second ridge groove region on the same surface is composed of a single layer, and the first ridge groove region 2 includes a plurality of first ridge portions 4 and a plurality of The first groove portion 5 includes a plurality of second ridge portions 6 and a plurality of second groove portions 7.

Further, the first ridge portion 4 including the first ridge groove region and the second ridge groove region of the second ridge groove region shown in FIG. 1 and the first ridge portion 4 and The first groove portions 5 are parallel to each other and alternately arranged. In other words, the first ridge portion 4 and the first groove portion 5 are parallel to the direction A and alternately arranged in the direction B orthogonal to the direction A.

Further, in the second ridge region 3 including the first ridge groove region and the second ridge groove region of the second ridge groove region shown in FIG. 1, the second ridge portion 6 and the second groove portion 7 are parallel to each other and are The interaction is arranged in parallel with the first ridge portion 4 and the first groove portion 5. In other words, each of the second ridge portions 6 and the second groove portions 7 is parallel to the direction A and alternately arranged in the direction B.

Furthermore, the non-woven fabric 1 including the first ridge groove region and the second ridge groove region on the same surface as shown in FIG. 1 is composed of one first ridge groove region 2 and adjacent to the first ridge groove region 2 The two second ridge regions 3 are formed.

Further, although not shown, the non-woven fabric 1 including the first ridge groove region and the second ridge groove region on the same surface as shown in FIG. 1 and the second ridge groove region in the first ridge groove region 2 are smaller than the second ridge groove region. The diameter of the fibers in 3 is finer, and the amount of fibers in the first ridge portion 4 is larger than the amount of fibers in the first groove portion 5.

Further, in the non-woven fabric 1 including the first ridge groove region and the second ridge groove region on the same surface as shown in FIG. 1, the first ridge groove region 2 is more excellent in liquid permeability than the second ridge groove region 3, and the second is The sulcus region 3 is superior to the first sulcus region 2 in liquid inhalation.

Fig. 2 is a cross-sectional view showing the XX cross section of the nonwoven fabric 1 including the first ridge groove region and the second ridge groove region on the same surface. As shown in FIG. 2, the non-woven fabric 1 including the first ridge groove region and the second ridge groove region on the same surface, the height h ₁ of the ridge of the first ridge portion is higher than the height h ₂ of the ridge of the second ridge portion.

In the first ridge groove region 2 including the first ridge groove region and the second ridge groove region on the same surface as shown in FIG. 1, the first ridge portion 4 and the first groove portion 5 are parallel to each other and alternately arranged. However, in the present invention, the first ridge groove region and the second ridge groove region are not woven on the same surface, and the first ridge portion and the first groove portion are not alternately arranged as long as they are alternately arranged, for example, the first ridge portion. And the first groove portion is in a meandering state. For example, when the first ridge groove region is viewed from above, the first ridge portion and/or the first groove portion may have a wave shape.

Further, in the present specification, the non-woven fabric including the first ridge groove region and the second ridge groove region on the same surface of the present invention is simply referred to as the nonwoven fabric of the present invention.

The nature and formation method of the first ridge portion and the first groove portion in the first ridge region are described with respect to the method for producing the nonwoven fabric of the present invention.

In the second ridge region 3 including the first ridge groove region and the second ridge groove region of the second ridge groove region shown in FIG. 1, the second ridge portion 6 and the second groove portion 7 are parallel to each other and alternately arranged. Further, in parallel with the first ridge portion and the first groove portion, the second ridge portion and the second groove portion may be arranged in a non-woven fabric according to the present invention, and the second ridge portion and the second groove portion may be parallel, for example, the second ridge portion and the second groove portion may be In the form of the meandering, for example, when the second ridge groove region is viewed from above, the second ridge portion and/or the second groove portion may have a wave shape. Further, the second ridge portion and the second groove portion may not be parallel to the first ridge portion and the first groove portion.

Further, the nature and formation method of the second ridge portion and the second groove portion in the second ridge region are described in relation to the method of manufacturing the nonwoven fabric of the present invention.

The first ridge region and the second ridge are included on the same surface as shown in FIG. The non-woven fabric 1 in the groove region is composed of one first ridge groove region 2 and two second ridge groove regions 3 adjacent to the first ridge groove region 2, but the nonwoven fabric of the present invention is not limited to this. In an embodiment, for example, a non-woven fabric including one first ridge groove region and one second ridge groove region on the same surface; and two non-woven fabric regions including one first ridge groove region and one second ridge groove region on the same surface The non-woven fabric including two or more first ridge groove regions and two or more second ridge groove regions on the same surface is included in the range, and is appropriately designed according to a desired function.

In the nonwoven fabric of the present invention, the diameter of the fibers in the first ridge region is smaller than the diameter of the fibers in the second ridge region, and the height of the ridge of the first ridge is higher than the height of the ridge of the second ridge. However, such reasons, functions, and the like are described in relation to the manufacturing method of the nonwoven fabric of the present invention. Further, in the nonwoven fabric of the present invention, the amount of fibers in the first ridge portion is more than the amount of fibers in the first groove portion, and the reason, function, and the like are related to the method of manufacturing the nonwoven fabric of the present invention. Description.

The non-woven fabric including the first ridge groove region and the second ridge groove region on the same surface of the present invention is not particularly limited as long as it has the above-described structure, and may be manufactured by, for example, the following method.

1. Prepare the steps of the non-woven fabric that must be processed; 2. Unevenly extending a portion of the non-woven fabric to be processed, forming a region having a high extension portion and a low extension portion, and forming a region including: a region having a high extension portion and a low extension portion, and a non-woven fabric portion having a non-extended region Step; 3. Will contain: an area having the above-mentioned high extension portion and low extension portion And the non-woven fabric of the non-extended region is disposed on the support, and then the step of spraying the discharged fluid to the region having the high extension portion and the low extension portion and the two regions of the non-extended region.

Hereinafter, the above method (hereinafter referred to as "the method of the present invention") will be described in detail.

The method of the present invention is a step comprising preparing a non-woven fabric that must be processed.

The non-woven fabric which has to be treated as described above may be made of a non-woven fabric. However, for example, non-woven fabrics produced by various known methods are, for example, hot air non-woven fabric, spunbonded nonwoven fabric, point-bonded non-woven fabric, and spunlace. Non-woven fabric, air-laid non-woven fabric, spray-melted non-woven fabric, non-woven fabric containing nanofiber, non-woven fabric, etc. The above-mentioned stretchable nonwoven fabric means a nonwoven fabric containing the above-mentioned stretchable fibers.

The non-woven fabric which has to be treated as described above is preferably a hot air non-woven fabric, a spunbonded non-woven fabric, or a stretchable nonwoven fabric.

As the non-woven fabric which must be handled as described above, a commercially available non-woven fabric can be used as it is. Further, the nonwoven fabric which must be treated as described above may be a single layer or may be a laminate.

When a non-woven fabric including the first ridge groove region and the second ridge groove region on the same surface is used for the absorbent article, the nonwoven fabric which has to be treated is preferably a basis weight of about 10 to 80 g/m ² . A basis weight of from about 15 to about 70 g/m ² is more desirable, and a basis weight of from about 20 to about 60 g/m ² is more desirable. When the basis weight is less than about 10 g/m ² , the amount of fibers is insufficient when used in an absorbent article. In particular, in the first ridge region, the first ridge portion is less likely to be formed, and more than about 80 g/m ^{2 is formed.} At the time, the air permeability is lowered, and there is a tendency to be disadvantageous to the cost.

It is preferable that the non-woven fabric which has to be treated is a liquid-permeable top sheet in which the first ridge groove region and the second ridge groove region are formed on the same surface, and it is hydrophilic. When it comes into contact with hydrophilic excrement (urine, sweat, stool, etc.), the excrement does not remain on the surface of the non-woven fabric, and it can easily pass through the inside of the non-woven fabric.

Among the non-woven fabrics which have to be treated, for example, a non-woven fabric produced by treating a hydrophobic nonwoven fabric with a hydrophilic agent, a non-woven fabric made of a fiber mixed with a hydrophilic agent, a non-woven fabric coated with a surfactant, and the like are used as the hydrophilic material. Further, among the non-woven fabrics which have to be treated as described above, those having hydrophilicity may be hydrophilic fibers, and for example, non-woven fabrics made of natural and/or semi-natural fibers may be used.

The nonwoven fabric which must be treated as described above is not particularly limited to include fibers used in the technical field. Examples of the above fibers include natural fibers, semi-natural fibers, and synthetic fibers. As the above fiber, it is preferably a synthetic fiber. The reason is that the fiber is not excessively dense when the step of forming the nonwoven fabric having the unevenness described later, and the flexibility of the nonwoven fabric including the first ridge groove region and the second ridge groove region formed on the same surface by the step is formed. high. In the nonwoven fabric which has to be treated, the ratio of the synthetic fibers is preferably about 50% by mass or more based on the total amount of the fibers, more preferably about 70% by mass or more, and more preferably about 100% by mass. The higher the proportion of the above synthetic fibers, the more easily the user's body pressure is applied, and the air permeability is high. Become better. Examples of the material of the synthetic fiber include polyethylene, polypropylene, and polyester.

When the fiber is considered to have moldability, it is preferably a fineness of from about 1 to about 6 dtex. Moreover, as the fiber, the fiber length is not particularly limited, and examples thereof include short fibers and continuous long fibers. When two or more kinds of fibers are mixed, the fibers of the fibers may be the same length or different.

The structure of the above-mentioned fibers is a core-sheath structure and a side-by-side structure which can be self-fusing fibers.

The non-woven fabric to be treated as described above may further comprise an extensible fiber, a stretchable fiber, and a combination thereof.

In the present specification, "stretchable fiber" means a fiber that can be elastically stretched. More specifically, the above-mentioned stretchable fiber means that it has a larger elastic limit than the stress applied during the formation and the imaginary use, and is within the range of the stress applied during the formation and the imaginary use. Elastically elongated fibers. The material of the stretchable fiber may, for example, be a polyurethane-based elastomer, a polyethylene-based elastomer, a polyolefin-based elastomer, a polyamide-based elastomer, a polyester-based elastomer, or a combination thereof. The above-mentioned stretchable fiber is preferably a polyurethane-based elastomer from the viewpoint of less skew after elongation and high heat resistance.

The fiber diameter of the above-mentioned stretchable fiber is preferably in the range of 2 to 50 μm, and more preferably in the range of 15 to 30 μm.

In the present specification, "elongated fiber" means a fiber having a lower elastic limit than the elastic fiber. More specifically, the above extensible fiber means that it has a smaller elastic limit than the stress applied at the time of formation. And a fiber that can be plastically deformed by the stress applied at the time of formation. The extensible fiber is thinned and lengthened by plastic deformation. Further, in the present specification, the extensible fiber which is plastically deformed by the stress applied at the time of formation is referred to as "elongated stretched fiber". Examples of the elongated fiber to be stretched include those having a uniform diameter or a non-uniform diameter. For example, a portion having a small portion (reduced portion) may be mentioned.

Examples of the material of the extensible fiber include a polyolefin, and examples thereof include polyethylene and polypropylene, polystyrene, polyester, polyamide, polyurethane, polylactic acid, or a combination thereof. Fiber. The extensible fiber may be a composite fiber such as a core-sheath fiber or a side-by-side fiber.

The extensible fiber is preferably a fiber containing polypropylene or polyethylene from the viewpoint of low crystallinity, high elongation, and the like.

The fiber diameter of the extensible fiber is preferably in the range of from about 1 to about 40 μm, and more preferably in the range of from about 5 to about 25 μm. Further, the fiber diameter of the extensible fiber is preferably smaller than the fiber diameter of the stretchable fiber. Further, the nonwoven fabric of the present invention can be imparted with softness, high bulkiness, concealability and the like.

The method of the present invention comprises non-uniformly extending a portion of the non-woven fabric to be processed to form a region having a high extension portion and a low extension portion, and forming a region including: a high extension portion and a low extension portion, and a non-extension region The step of non-woven (hereinafter, there is a case called "non-uniform extension step").

The region extending by the above-described uneven extension step, that is, the region having the high extension portion and the low extension portion, is a fluid processing step thereafter. A first ridge area is formed. Therefore, in this uneven extension step, a region with a high extension portion and a low extension portion is mainly mentioned.

Further, the region where the uneven stretching step is not extended, that is, the non-extended region, is formed by the subsequent fluid processing step to form the second ridge region.

The uneven stretching step is a step in which the non-woven fabric which has to be treated is in a predetermined range (after which it becomes a region having a high-extension portion and a low-extension portion), and in order to perform the bonding of the portion (i) breaking the bonding of the fibers in the nonwoven fabric At the point, the fixed fiber is made into a fiber web state, and then (ii) the fiber is plastically deformed between the joints of the fibers in the non-woven fabric to become thin and long. Here, in the above (ii), the fiber which is plastically deformed and becomes thinner and longer has a uniform diameter, and further has a non-uniform diameter, and for example, has a partially thin portion (reduced portion). In the above (ii), the fibers are plastically deformed between the joints of the fibers in the nonwoven fabric to be fine and long, whereby the amount of fibers that are moved during the subsequent fluid treatment step is increased. On the other hand, it is easy to form the first ridge portion having a high height and the first groove portion having a deep depth in the non-woven fabric.

In addition, in the present specification, a fiber which is plastically deformed by a stress or the like applied at the time of formation may be a "stretched fiber".

As the joint, when the hot air is not woven, a hot-melt joint, a spunbond non-woven fabric, and a dot-bonded non-woven fabric may be mentioned, and a thermocompression bonding point may be mentioned, and when the spunlace is not woven, a fiber symmetry point may be mentioned.

In the present specification, "highly stretched portion" means: the elongation of the elongated fiber, which is extended to a portion higher than the low extension portion, and "low extension" "Partial" means that the elongation of the elongated fiber is extended to a lower portion than the high extension portion, and the portion of the elongated fiber is not formed, that is, the non-extended portion is included.

In the present specification, "non-uniformly extending" means extending a non-woven fabric into a region having a high-stretching portion and a low-stretching portion, that is, extending a non-woven fabric to form a region having different elongation of fibers which are elongated according to the portion. .

The above steps are not particularly limited as long as they can form a region having a high extension portion and a low extension portion in the nonwoven fabric which must be processed, and can be carried out by any means, but for example, by having a direction of transport and a pair of gear rolls having orthogonal rotation axes, wherein a part of the non-woven fabric to be processed is passed through a gap in which a plurality of teeth disposed on the outer peripheral surface of each of the gear rolls are meshed with each other (hereinafter, referred to as The method of "gear rolling" is carried out.

Fig. 3 is a schematic view for explaining gear rolling. The gear rolling device 11 shown in Fig. 3 has a pair of gear rolls 12 and 12'. A plurality of teeth 14 and 14' are disposed on the outer peripheral surfaces 13 and 13' of the gear rolls 12 and 12', respectively. Further, in the gear rolling device 11 shown in Fig. 3, the rotation axes of the gear rolls 12 and 12' are perpendicular to the conveyance direction MD of the nonwoven fabric. Further, the plurality of teeth 14 and 14' are disposed perpendicular to the rotation axis, and are disposed on the outer peripheral surfaces 13 and 13'.

In the gear rolling device 11 shown in FIG. 3, the non-woven fabric 15 which has to be processed is passed through the roller gaps of the pair of gear rollers 12 and 12', and the gear rollers 12 and 12' are passed through the meshing gear rollers 12 and 12's multiple teeth 14 and 14', extending the non-woven fabric that must be processed on the principle of three-point bending 15. The non-woven fabric 15 which has to be processed forms a region having a high extension portion and a low extension portion, and as a result, a nonwoven fabric 16 including a region having a high extension portion and a low extension portion and a non-extended region is formed.

Fig. 4 is a view for explaining a non-woven fabric including a region having a high extension portion and a low extension portion and a non-extended region, which is manufactured by the gear rolling device shown in Fig. 3; The non-woven fabric which has to be processed is formed by a gear rolling, and is formed with a nonwoven fabric 16 including a region having a high extension portion and a low extension portion and a non-extended region. The non-woven fabric 16 including the high extension portion and the low extension portion and the non-extended region has a region 17 having a high extension portion and a low extension portion, and a non-extension region 18. The non-extended region 18 is formed on both sides of the transport direction MD of the region 17 having the high extension portion and the low extension portion, that is, the side portion formed on the side of the orthogonal direction CD orthogonal to the transport direction MD.

Further, the region 17 having the high extension portion and the low extension portion alternately has a high extension portion 17' indicated by a solid line in parallel with the conveyance direction MD in the orthogonal direction MD; and a low extension portion 17 indicated by a dotted line. ".

In the above-described gear rolling, since the fabric of the non-woven fabric to be treated is fixed to the portion where the front ends of the plurality of teeth 14 and 14' are connected, the low-stretch portion 17" is formed without transition or substantially no extension. On the other hand, in a region which is not connected to the front end portions of the plurality of teeth 14 and 14', it is largely extended to form a high extension portion 17'.

In addition, FIG. 4 is a view for explaining a non-woven fabric including a region having a high extension portion and a low extension portion and a non-extended region, and a plurality of teeth 14 and 14' of the gear calendering device 11 shown in FIG. 3; High extension shown The number of portions 17' and low extension portions 17" are not identical.

Further, in FIGS. 3 and 4, an example in which the center portion of the non-woven fabric to be processed is subjected to gear rolling is used. However, in the method of the present invention, gear rolling can be performed only on the left side or the right side in the conveyance direction.

Further, the gear rolling can be carried out using a gear calendering apparatus of the type shown in Fig. 5.

Fig. 5 is a schematic view for explaining gear rolling. The gear rolling device 11 shown in Fig. 5 is a pair of gear rolls 12 and 12'. A plurality of teeth 14 and 14' are disposed on the outer peripheral surfaces 13 and 13' of the gear rolls 12 and 12', respectively. Further, in the gear rolling device 11 shown in Fig. 5, a plurality of teeth 14 and 14' are disposed in parallel with the rotation axes of the gear rolls 12 and 12', and are disposed on the outer peripheral faces 13 and 13', respectively. By arranging the plurality of teeth 14 and 14' in this manner, in the region having the high extension portion and the low extension portion, the nonwoven fabric having the high extension portion and the low extension portion which are alternately perpendicular to the conveyance direction MD in the orthogonal direction can be formed.

Further, the gear rolling can be carried out by using a gear rolling device in which a plurality of teeth are arranged obliquely on the outer circumferential surface of the gear roller with respect to the rotation axis of the gear roller as shown in Fig. 6 . Fig. 6 is a schematic view for explaining gear rolling. The gear rolling device 11 shown in Fig. 6 has a pair of gear rolls 12 and 12', and a plurality of teeth 14 and 14' are disposed on the outer peripheral faces 13 and 13' of the gear rolls 12 and 12', respectively. Further, in the gear rolling device 11 shown in Fig. 9, the rotation axes of the gear rolls 12 and 12' are perpendicular to the conveyance direction MD of the nonwoven fabric. Further, the plurality of teeth 14 and 14' are disposed on the outer peripheral surface 13 so as to have a constant angle θ with respect to the rotation axis. And 13’.

Further, in the gear rolling device of the type shown in Fig. 6, one tooth 14 and one piece are disposed on the outer peripheral surfaces 13 and 13' of the gear rolls 12 and 12', respectively, according to the angle θ and the gear pitch. The case of the tooth 14'.

The gear rolling device described above can be suitably selected depending on the desired properties of the formed non-woven fabric having irregularities.

In the above gear rolling device, the gear pitch is preferably from about 1 to about 10 mm, and more preferably from about 2 to about 6 mm. When the gear pitch is less than about 1 mm, the derivation must make the blade of the gear thin, and there is a case where the non-woven fabric is partially cut, and when the gear pitch exceeds about 10 mm, the stretch ratio is lowered, and the fiber is meshed and / or the plastic deformation of the fiber is insufficient.

The gear pitch refers to the interval from a certain tooth to the next tooth indicated by reference numeral 19 in FIG.

In the gear rolling device described above, it is preferable that the gear bite depth is about 0.5 mm or more. When the gear bite depth is less than about 0.5 mm, the elongation of the non-woven fabric is insufficient, and there is a case where it is difficult to form a high elongation portion.

The gear bite depth refers to the depth of the portion of the upper gear roller and the portion of the lower gear roller that are repeated with reference to FIG.

In the region having the high extension portion and the low extension portion, the stretching ratio in the extending direction is preferably from about 30 to about 400%, and more preferably from about 50 to about 200%. When the stretching ratio is less than about 30%, the non-woven fabric which must be treated stays in the case of elastic deformation, and in the non-woven fabric which must be treated, there is substantially no formation of a region having a high extension portion and a low extension portion. In other words, when the stretching ratio exceeds about 400%, the strength of the region having the high elongation portion and the low elongation portion is weak, and the stretched fiber is liable to fall off, which may be difficult to transport.

In this specification, "stretching magnification" means: when the gear pitch is P, and when the gear biting depth is D, according to the following formula: The calculated value.

The method of the present invention comprises: disposing a non-woven fabric having a region having the high-extension portion and the low-extension portion and the non-extended region on the support, and then facing the region having the high-extension portion and the low-extension portion, and The step of blowing the discharged fluid in two regions of the non-extended region (hereinafter, referred to as "fluid processing step").

Fig. 7 is a view showing an example of a device used in the fluid processing step. Here, an example in which the gear rolling by the gear rolling device shown in FIG. 3 includes a fluid region in which a region having a high extension portion and a low extension portion and a non-woven fabric having a non-extended region are subjected to fluid processing will be described.

The non-woven fabric 16 including the region having the high extension portion and the low extension portion and the non-elongation region formed in FIG. 3 has a region 17 having a high extension portion and a low extension portion existing in the center of the conveyance direction MD; The non-extended regions 18 present on both sides of the transport direction MD. The region formed in FIG. 3 includes: a region having a high extension portion and a low extension portion, The non-woven fabric 16 with the non-extended region is placed on the support body 21 as a punching plate, and the three regions of the region 17 having the high extension portion and the low extension portion and the non-extension region 18 are blown from the fluid nozzle 22 The fluid that is ejected.

Further, in the apparatus shown in Fig. 7, a suction portion (not shown) for accommodating a fluid sandwiching the support 21 is provided below the fluid nozzle 22. The non-woven fabric 16 that is placed on the support body 21 and that is carried by the support body 21 and has a high extension portion and a low extension portion, and a non-woven fabric 16 that is not extended, is formed by blowing a fluid discharged from the fluid nozzle 22 to be formed on the same surface. Non-woven fabric 1 in the first ridge groove region and the second ridge groove region. Further, the fluid to be blown is discharged from a suction portion (not shown).

In the region having the high extension portion and the low extension portion formed by the above-described uneven extension step, the fibers in the state of the web of the high extension portion and/or at least a portion of the elongated fibers are on the surface of the fluid conflict (below , called the fluid collision surface), the fluid collisions that are ejected are differentiated in the direction of the plane, for example, in the orthogonal direction, with the subsequent bounce. Further, a surface on the opposite side to the fluid collision surface (hereinafter referred to as a non-fluid collision surface), at least a part of the fiber in the fiber state and/or the elongated fiber, along with the passage includes: a high extension portion and a low extension Part of the area, the non-woven fluid flow with the non-extended area moves.

As a result, a plurality of first ridge portions and a plurality of first groove portions of the first ridge groove region of the type shown in FIG. 1 are formed. Since the fibers are distinguished in the immediately lower portion of the fluid nozzle, the first groove portion is formed, and the divided fibers are collected in the portion between the two fluid nozzles to form the first ridge portion.

On the other hand, in the non-extended region, since there is no subsequent uneven stretching step, the fibers in the fiber state and the elongated fibers do not exist in principle. Therefore, since the amount of the movable fiber is smaller than that of the region having the high extension portion and the low extension portion, the ejected fluid collides, and then, with the rebound, some of the fibers are oriented in the plane direction, for example, in the orthogonal direction. It is distinguished, so its amount is smaller than that of the area with high extension and low extension.

As a result, as shown in FIG. 1, the plurality of second ridges and the plurality of second grooves are formed in the second ridge region, and the height of the second ridge is lower than the height of the first ridge. Further, in the second ridge groove region, as in the first ridge groove region, since the fibers are distinguished in the immediately lower portion of the fluid nozzle, the second groove portion is formed, and the portion between the two fluid nozzles is distinguished. The fibers gather to form a second ridge.

Further, the non-woven fabric which has to be processed is subjected to gear rolling as shown in Fig. 3, and after the fluid treatment as shown in Fig. 7, the first ridge groove region of the type shown in Fig. 1 is formed on the same surface, and In the second ridge region, the nonwoven fabric is not woven, and in FIG. 1, the direction A corresponds to the transport direction MD, and the direction B corresponds to the orthogonal direction CD.

In the non-woven fabric including the first ridge groove region and the second ridge groove region on the same surface of the present invention, the diameter of the fibers in the first ridge groove region is smaller than the diameter of the fibers in the second ridge groove region. Although the degree of the fiber in the first ridge region is preferably about 3% or more smaller than the diameter of the fiber in the second ridge region, it is preferable that the diameter of the fiber in the first ridge region is about 3% or more. More than 5% is more desirable, and a fine of about 7% or more is ideal. Will be the first The diameter of the fibers in the sulcus region is finely increased, thereby affecting the height of the ridges in the region of the first ridge. Further, when the diameter of the fiber in the first ridge region is too small, there is a problem in strength. Therefore, the lower limit of the diameter of the fiber in the first ridge region should be about the diameter of the fiber in the second ridge region. 50%.

In the non-woven fabric including the first ridge groove region and the second ridge groove region on the same surface of the present invention, the height of the ridge of the first ridge portion is preferably 1.1 times or more higher than the height of the ridge of the second ridge portion. A height of about 1.2 times or more is more desirable, and a height of about 1.3 times or more is more desirable. When the height of the ridge of the first ridge is not more than 1.1 times higher than the height of the ridge of the second ridge, the difference between the properties of the first ridge region and the second ridge region is less likely to occur. . Further, in order to form the non-woven fabric including the first ridge groove region and the second ridge groove region on the same surface by a single nonwoven fabric, the height of the ridge of the first ridge portion is higher than the height of the ridge of the second ridge portion. About 10 times, but this should be the upper limit.

In the non-woven fabric including the first ridge groove region and the second ridge groove region on the same surface of the present invention, the height of the ridge of the first ridge groove region is, for example, about 0.1 to about 5 mm when the nonwoven fabric is used for an absorbent article. Ideally, about 0.3 to about 4 mm is more desirable, and about 0.5 to about 3 mm is most desirable. When the height is about 0.1 mm or less, the difference between the first ridge region and the second ridge region is small, and the properties of the regions, particularly the difference in liquid permeability and liquid inhalation, tend to be less likely to occur, and exceed When it is used as an absorbent article, when the thickness is increased as a whole, the wearing feeling is deteriorated, and the volume becomes large and it is not easy to carry.

In the non-woven fabric including the first ridge region and the second ridge region on the same surface of the present invention, the first ridge portion and the first groove portion of the first ridge region and the second ridge portion of the second ridge region and The width of the second groove portion is preferably such that the nonwoven fabric is used for an absorbent article, and is preferably from about 0.2 to about 10 mm, and more preferably from about 0.5 to about 5 mm. When the width is less than about 0.2 mm, the formation of the ridge structure tends to be difficult in the nonwoven fabric. When the width exceeds about 10 mm, the contact area between the skin and the non-woven fabric of the present invention becomes large, so that the sultry heat becomes large and the width of the groove becomes wide. As the width becomes larger, there is a tendency that the ridge becomes easy to overwhelm.

Further, in the first ridge groove region, the first ridge portion and the first groove portion have the same width, the width of the first ridge portion is larger than the width of the first groove portion, or the width of the first ridge portion is larger than that of the first groove portion. The width is smaller, but when the width of the first ridge is increased, the width of the first groove is smaller than the width of the first ridge.

The fluid used in the fluid treatment step described above is air, for example, heated air, water vapor, or water, for example, hot water.

From the fixed fluid nozzle, the fluid may be sprayed to a non-woven fabric including a region having a high extension portion and a low extension portion, and a non-stretching region, or may be blown from a fluid nozzle that reciprocates in the orthogonal direction CD. When the fluid nozzle that reciprocates in the orthogonal direction CD includes a region having a high extension portion and a low extension portion and a non-woven fabric with a non-extended region, a first ridge portion and a first groove portion having a wave shape are formed.

Further, the fluid nozzle pair may include: a region having a high extension portion and a low extension portion, a non-woven fabric continuity with the non-extension region, or intermittently spraying Blow the above fluid. Also, these may be combined. Further, when the fluid nozzle pair includes a region having a high extension portion and a low extension portion and a non-woven fabric intermittently blowing the fluid, the first ridge portion, the first groove portion, and the second ridge portion are intermittently formed. And the second ditch.

The fluid may be suitably selected depending on the state including the region having the high extension portion and the low extension portion, and the non-woven fabric of the non-extended region, particularly the non-extended region. For example, in a region having a high extension portion and a low extension portion, when the gear pitch is small and the stretching ratio is large, when the amount of the joint portions of the fibers is small in the non-extended region, the fiber can be moved by relatively low energy. Therefore, it is ideal to choose air or water vapor as the fluid. Further, in a region having a high extension portion and a low extension portion, when the gear pitch is large and the stretching ratio is low, when the amount of the joint portion between the fibers is large in the non-extended region, it is necessary to move the fibers. There is a relatively high energy, so it is desirable to use water or steam as a fluid, and water vapor is more desirable. The reason is that moisture in the portion where the amount of fibers is large is not easily left, and the stretched fibers of the portion that must be moved can be easily moved.

The above fluid treatment step can be carried out by a conventional method using a device conventionally known in the art.

In the first embodiment of the present invention, in order to support a support body including a region having a high extension portion and a low extension portion and a non-woven fabric having a non-elongation region, a support body which can be generally used in the technical field is, for example, Metals, such as punching plates, plastic conveyor nets, papermaking nets, and the like. The above-mentioned support body is generally fluid-permeable.

The punching plate is, for example, a circular hole type, and for example, a round hole 60° sawtooth type, round hole angle sawtooth and round hole series type, angle hole type, circle type 10 (⊕), cloud type, cloud sawtooth type and other punching plates.

Further, in the non-fluid collision surface, since a part of the fiber moves along the flow direction of the fluid, especially in the region having the high extension portion and the low extension portion, the surface on the opposite side to the surface on which the fluid is blown is disposed in advance. When the shape and the support of the protruding portion and the recessed portion are determined, the uneven surface may be formed on the surface opposite to the surface having the first ridge groove region and the second ridge groove region.

The support body having the above-described projecting portion and the recessed portion is, for example, (i) a support having a projecting portion and a recessed portion respectively parallel to the conveying direction, and the projecting portion and the recessed portion are alternately arranged in an orthogonal manner. (ii) a support having a projecting portion and a recess portion inclined with respect to the transport direction, wherein the projecting portion and the recess portion are alternately arranged in a direction orthogonal to the direction of the tilt; (iii) having a predetermined a protrusion of a predetermined shape (for example, a cubic shape, a cylindrical shape, a hemispherical shape, or the like) and/or a support of the depressed portion, and the protruding portion and the depressed portion are arranged in advance (for example, a heart shape, The arrangement of stars and the like is configured and the like.

Further, the condition for blowing the fluid differs depending on the type of the nonwoven fabric to be treated, the use of the first ridge groove region on the same surface, the use of the nonwoven fabric in the second ridge region, and the like, but for example, the fluid is water. In the case of steam, it can be set to discharge pressure: about 0.2 to about 0.8 MPa, water vapor temperature: about 119 to about 167 ° C, and the interval between the nozzle and the support: about 0.1 to about 10 mm. Moreover, when the fluid is hot water, it can be set to discharge pressure: about 1 to about 10 MPa, hot water temperature: about 50 to about 100 ° C, nozzle and support. Interval: about 0.1~about 30mm. Further, the interval between the nozzles is determined according to the width of the first ridge portion and the first groove portion of the first ridge region and the second ridge portion and the second groove portion of the second ridge region.

The non-woven fabric including the first ridge groove region and the second ridge groove region on the same surface of the present invention is derived from the structure, and the first ridge groove region is more excellent in liquid permeability than the second ridge groove region, and the second ridge is provided. The groove region tends to be more excellent in liquid inhalation than the first groove region. Specifically, the first ridge region is derived from a gear rolling step and a fluid processing step, in particular, the fibers in the first ridge portion are aligned in the thickness direction, and the interfiber distance is larger than the second ridge region, and the density is low. Since the liquid is easily transmitted, it has a tendency to be more liquid-permeable than the second ridge region.

On the other hand, the second ridge groove region receives the fluid processing step without the gear rolling step, and has a high density structure because the distance between the fibers is smaller than that of the first ridge groove region, and the capillary force is easily applied, so that the liquid is sucked and easily diffusion. Therefore, the second ridge area tends to have better liquid inhalation than the first ridge area.

The non-woven fabric including the first ridge groove region and the second ridge groove region on the same surface of the present invention is an absorbent article, for example, disposable diapers after use in physiological products and after use; cleaning articles such as wipes; and medical treatment Supplies such as masks are useful. Examples of the absorbent article include a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber between the upper sheet and the back sheet. When the liquid permeable upper sheet is a non-woven fabric including the first ridge region and the second ridge region on the same surface of the present invention, the first ridge region has the longitudinal center of the absorbent article. In the second ridge region, it is preferable that both sides in the long direction exist. The first ridge region tends to have high liquid permeability, and the absorbed liquid can be quickly transferred to the absorber, and the second ridge region has a tendency to be excellent in liquid suction property as evaluated by Clem water absorption or the like. The liquid absorbed in the center portion in the longitudinal direction is sucked and diffused, and the entire absorbent body can be effectively used.

[Examples]

Hereinafter, the present invention will be described by way of examples and comparative examples, but the present invention is not limited by the examples.

The measurement conditions of the items evaluated in the examples and the comparative examples are as follows.

[fiber diameter]

The fiber diameter was measured using a Real Surface View microscope VE-7800 manufactured by Keyence Co., Ltd., and the fiber diameter was measured for 50 samples of any of the fibers at an acceleration voltage of 5 kV and 300 times, and the average of the fibers was measured. It is used as a fiber diameter.

[height of the ridge]

The height of the ridge is measured by using a high-precision 2-dimensional laser displacement meter manufactured by Keyence Co., Ltd., and the highest point of the ridge is arbitrarily measured at 10 points, and the sum is averaged.

[base weigh]

The basis weight is measured in accordance with 5.2 of JIS L 1906.

[volume]

The volume was measured using THICKNESS GAUGE UF-60 manufactured by Daiei Scientific Seiki Co., Ltd.

[Compression characteristics]

The compression characteristics were evaluated using an automated compression tester, KES-FB3, manufactured by Japan Gado Technology Co., Ltd.

The measurement conditions are as follows.

SENS: 2

Speed: 0.02mm / sec

Stroke: 5mm/10V

Pressurized area: 2cm ²

Capture interval: 0.1 second

Maximum load: 50g/cm ²

Repeat times: 1 time

Compression characteristics is based showing nonwoven fabric per 1cm ² of WC compression energy; represents the thickness of the sample pressure 0.5gf / cm ² in the T _0; represents T _m the thickness of the sample pressure 50gf / cm ² is evaluated. WC indicates that the larger the value, the easier it is to be compressed.

[ventilation]

The air permeability was measured using a KES-F8-AP1 air permeability tester from Japan Gado Technology Co., Ltd., and the unit was converted into "m ³ /m ² /min".

The air permeability in the thickness direction of the non-woven fabric was measured by placing a non-woven fabric of a size of 100 mm × 100 mm in an air permeability tester.

The air permeability in the plane direction of the non-woven fabric is a non-woven fabric of a size of 100 mm × 100 mm, and is placed in an air permeability tester, and an acrylic plate of a size of 100 mm × 100 mm is placed thereon, and the weight is increased at 3.5 mN/cm ² . The measurement was carried out.

[Clem Water Absorption]

The evaluation was carried out in accordance with JIS P 8141 at a suction height (mm) of 5 minutes.

[liquid permeability]

The liquid permeability was evaluated using a LISTERING company and a LISTER piercing tester. The evaluation order is as follows.

(1) The sample having a size of 100 × 100 mm was cut out and placed on five sheets of a filter paper (ADVANTEC FILTER PAPER GRADE 2) having a size of 100 × 100 mm, and the electrolyzed liquid-permeable plate was placed thereon.

(2) A filter paper, a sample, and an electrolyzed liquid-permeable plate are provided in the body of the puncture tester. Further, the sample is set such that the opening of the testing machine coincides with the first ridge area or the second ridge area.

(3) 5 mL of physiological saline was placed in the body of the puncture tester.

(4) The physiological saline (room temperature) is dropped from the puncture tester body to the opening portion of the current-permeable liquid-permeable plate.

(5) Record the energization time of the energized liquid-permeable panel.

(6) The measurement was repeated twice, and the average value of 3 times was taken as the liquid permeation time.

Further, when the sample was not set, that is, the liquid permeation time of the five pieces of the filter paper was 69 seconds.

[Manufacturing Example 1] - Gear rolling -

Prepare hot air non-woven fabric as a non-woven fabric that must be handled, using the gear calendering device of the type shown in Figure 3 (gear temperature: 55 ° C, gear pitch: 2.5 mm, gear bite depth: 3.0 mm, gear tip width: 0.2 mm, processing speed) : 50 m / min), as shown in FIG. 3, a non-woven fabric including a region having a high extension portion and a low extension portion and a non-extended region is formed. The region having the above-described high extension portion and low extension portion is present in the center of the conveyance direction as shown in FIG. 3, and the non-extended region is present on both sides in the conveyance direction. The region having the high extension portion and the low extension portion has a high extension portion and a low extension portion which are alternately parallel to the conveyance direction in the orthogonal direction orthogonal to the conveyance direction. The stretching ratio in the orthogonal direction of the region having the above-described high extension portion and low extension portion is 160%.

In the hot air non-woven fabric which is rolled by the gear, the fusion portion remains in the low extension portion of the front end portion of the contact tooth. Further, in the high extension portion where the front end portion of the contact tooth is not provided, a part of the fusion portion is broken, and a fiber mesh region is formed. area.

Table 1 shows the characteristics of the hot air non-woven fabric, the region having the high elongation portion and the low extension portion, and the non-extension region.

-Water vapor treatment -

The method includes: a non-woven fabric having a high-extension portion and a low-extension portion and a non-woven region of the non-extended region, and is placed on a punched plate having a serrated shape of 60° by a circular hole ( : 1.0 mm, MD pitch: 2.60 mm, CD pitch: 1.5 mm, thickness: 1.0 mm) The support body formed. Next, a plurality of nozzles are provided at intervals of 3.0 mm ( : 0.5mm) steam treatment system (discharge pressure: 0.4Mpa, water vapor temperature: about 141 ° C), while maintaining the distance between the nozzle and the support at 4.0 mm, including: having the above-mentioned high extension portion and low extension A part of the area and the non-woven fabric of the non-extended area were passed at a speed of 50 m/min, and the non-woven fabric 1 was obtained.

Table 1 shows the characteristic values of the nonwoven fabric 1.

In addition, when the non-woven fabric of the present invention is used as the upper sheet of the absorbent article, in order to grasp the air permeability of the entire upper sheet, the measurement includes the first ridge area and the first aspect so that the area ratio is 1:1. 2 The ventilation of the area in the ridge area. In addition, for comparison, the non-woven fabric including the region having the high extension portion and the low extension portion and the non-extension region is also included, and the region having the high extension portion and the low extension portion is measured so that the area ratio is 1:1. Ventilation with a non-extended area.

[Manufacturing Example 2]

The hot air non-woven fabric was changed to a spunbonded nonwoven fabric, and the processing speed at the time of gear rolling was changed to 30 m/min. Then, in the steam treatment, the water vapor temperature was changed to about 136 ° C, and the water vapor temperature was changed to about 136 ° C. Nonwoven 2 was obtained according to Production Example 1.

Table 1 shows the above-mentioned spunbonded nonwoven fabric; a region having a high-extension portion and a low-extension portion; and a non-extended region, and characteristics of the nonwoven fabric 2.

In addition, the air permeability is the same as that of the manufacturing example 1.

From Table 1, it is understood that the first ridge area is higher in liquid permeability than the second ridge area regardless of the type of woven fabric, and the second ridge area is higher than the first ridge area. .

Therefore, this is a suggestion that the nonwoven fabric of the first ridge groove region and the second ridge groove region on the same surface of the present invention is suitable as the liquid permeable upper sheet. For example, in the liquid permeable upper sheet, when the first ridge region is disposed in the longitudinal center portion of the absorbent article and the second ridge region is disposed on both sides in the longitudinal direction, the longitudinal center portion is It has excellent liquid absorption and is excellent in inhalation and diffusibility of liquid on both sides in the long direction.

1‧‧‧ Non-woven fabric containing the first ridge area and the second ridge area on the same side

2‧‧‧1st ridge area

3‧‧‧2nd ridge area

4‧‧‧1st ridge

5‧‧‧1st ditch

6‧‧‧2nd ridge

7‧‧‧2nd ditch

11‧‧‧Gear calendering device

12,12’‧‧‧ Gear Roller

13,13’‧‧‧ outer perimeter

14,14’‧‧‧Multiple teeth

15‧‧‧ Non-woven fabrics that must be disposed of

16‧‧‧Includes: non-woven fabrics with high extensions and low extensions, and non-extended regions

17‧‧‧A region with a high extension and a low extension

17’‧‧‧High extension

17”‧‧‧low extension

18‧‧‧ Non-extending areas

19‧‧‧ Gear spacing

20‧‧‧ Gear bite depth

21‧‧‧Support

22‧‧‧ fluid nozzle

MD‧‧‧Transport direction

CD‧‧‧orthogonal direction

Fig. 1 is a perspective view showing an embodiment of a non-woven fabric including a first ridge groove region and a second ridge groove region of the present invention on the same surface.

Fig. 2 is a cross-sectional view showing the X-X cross section of the nonwoven fabric 1 including the first ridge groove region and the second ridge groove region on the same surface.

Fig. 3 is a schematic view for explaining gear rolling.

Fig. 4 is a view for explaining a non-woven fabric including a region having a high extension portion and a low extension portion and a non-extended region, which is manufactured by the gear rolling device shown in Fig. 3;

Fig. 5 is a schematic view for explaining gear rolling.

Fig. 6 is a schematic view for explaining gear rolling.

Fig. 7 is a view showing an example of a device used in the fluid processing step.

1‧‧‧ Non-woven fabric containing the first ridge area and the second ridge area on the same side

6‧‧‧2nd ridge

4‧‧‧1st ridge

7‧‧‧2nd ditch

3‧‧‧2nd ridge area

2‧‧‧1st ridge area

5‧‧‧1st ditch

Claims (13)

A non-woven fabric is a non-woven fabric including a first ridge groove region and a second ridge groove region on the same surface, wherein the first ridge groove region includes: a plurality of first ridge portions; and a plurality of first groove portions, and a second The ridge groove region includes: a plurality of second ridges; and a plurality of second ridge portions, wherein the height of the ridges of the first ridge portion is higher than the height of the ridges of the second ridge portion, and the diameter ratio of the fibers in the first ridge portion The diameter of the fibers in the second ridge region is finer. The non-woven fabric according to the first aspect of the invention, wherein the first ridge portion and the first groove portion are arranged in parallel with each other. The non-woven fabric according to the second aspect of the invention, wherein the second ridge portion and the second groove portion are alternately arranged in parallel with each other, and are parallel to the first ridge portion and the first groove portion. The non-woven fabric according to any one of claims 1 to 3, wherein the amount of the fibers of the first ridge portion is larger than the amount of the fibers of the first groove portion. The non-woven fabric according to any one of claims 1 to 3, wherein the non-woven fabric is composed of one first ridge region and two second ridge regions adjacent to the first ridge region. The non-woven fabric according to any one of claims 1 to 3, wherein the first ridge area is more excellent in liquid permeability than the second ridge area, and the second ridge area is liquid inhalation than the first ridge area. better. The non-woven fabric according to any one of claims 1 to 3, which is composed of a single layer. An absorbent article comprising: a liquid permeable upper sheet, a liquid impermeable back sheet, and an absorbent article of an absorbent body between the upper sheet and the back sheet, wherein the upper sheet is patented The non-woven fabric according to any one of items 1 to 7 is formed. A method of manufacturing a non-woven fabric according to any one of claims 1 to 7, further comprising: a step of preparing a non-woven fabric to be processed, by passing a part of the non-woven fabric to be processed through a pair of gears The roller gap of the roller is unevenly extended to form a region having a high extension portion and a low extension portion, and a step of forming a non-woven fabric including a region having a high extension portion and a low extension portion, and a non-extended region, and including The non-woven fabric having the aforementioned high-extension portion and the low-extension portion and the non-extended region are disposed on the support, and then the region having the aforementioned high-extension portion and the low-extension portion; and the two regions of the non-extended region are blown The step of ejecting the fluid. The method for producing a nonwoven fabric according to claim 9, wherein the step of forming a region including the high-extension portion and the low-extension portion and the non-woven fabric in the non-extended region is a rotation axis orthogonal to the conveyance direction In the pair of gear rolls, a part of the non-woven fabric to be processed is performed by causing a plurality of teeth disposed on the outer peripheral surface of each of the gear rolls to mesh with each other while rotating. The method of manufacturing a nonwoven fabric according to claim 10, wherein the plurality of tooth systems are disposed on the outer peripheral surface perpendicular to the rotation axis, and are formed in a region having the high extension portion and the low extension portion. The orthogonal directions orthogonal to the transport direction alternately have a non-woven fabric having a high extension portion and a low extension portion parallel to the transport direction, or the plurality of tooth systems are disposed on the outer peripheral surface in parallel with the rotation axis, and have the high extension The portion and the region of the low extension portion are formed with non-woven fabrics having a high extension portion and a low extension portion which are alternately parallel to the direction orthogonal to the conveyance direction in the conveyance direction. The method for producing a nonwoven fabric according to claim 10, wherein the non-woven fabric to be treated is selected from the group consisting of a hot air non-woven fabric, a spunbonded nonwoven fabric, and a stretch nonwoven fabric. The method for producing a nonwoven fabric according to any one of claims 9 to 11, wherein the flow system is selected from the group consisting of air, steam, and water.