JP7065603B2 - Fiber non-woven sheet - Google Patents

Description

The present invention relates to a fibrous nonwoven fabric sheet formed by entwining fibers.

Conventionally, a fibrous nonwoven fabric sheet formed by entwining fibers is known. For example, Patent Document 1 discloses a fiber nonwoven fabric sheet having an uneven pattern formed by rearranging some fibers by water flow entanglement in a manufacturing process of a fiber web formed by fiber entanglement. ing.

Japanese Unexamined Patent Publication No. 2013-241724 (P2013-241724A)

In the fibrous nonwoven fabric sheet disclosed in Patent Document 1, the fibers are relatively excellent in flexibility because they are formed by entanglement of fibers as a whole, and the fibers are shaped by the fluid ejected from the injection nozzle in the manufacturing process. By having a concavo-convex pattern consisting of a plurality of concavo-convex lines extending in the direction of the machine to which the web is transported and alternately arranged in the direction intersecting the machine direction, the design is compared with the fiber non-woven fabric sheet without the pattern. Excellent in sex.

However, the uneven pattern is a mere continuous pattern extending to the outer peripheral edge of the sheet, and the outer contour of the entire pattern cannot be grasped. Therefore, it is not recognized by the user as a unique design attached to each sheet, but is recognized as a ground pattern that is a repetition of a simple design attached to a continuous fiber web, and has a high degree of design. I can't impress it as something.

On the other hand, by applying thermal embossing in the manufacturing process, a concave-convex design with high designability may be added, but the fibers in the concave portion that have been heated and pressed are heat-welded and become relatively hard, and the fibers become relatively hard. The original flexibility and drapeability of the non-woven fabric sheet are impaired, the skin feels poor, and the non-woven fabric sheet is easily torn.

An object of the present invention is to provide a fibrous nonwoven fabric sheet having a design portion which is comfortable to the touch and has a high design property.

In order to solve the above-mentioned problems, the present invention relates to a fibrous nonwoven fabric sheet having a first surface and a second surface facing each other in the thickness direction and formed by water- flow entanglement of fibers. ..

The fibrous nonwoven fabric sheet according to the present invention has a symbol portion formed from a concave line that is concave toward the second surface side on the first surface, and the concave line is formed by fiber entanglement, and the symbol is formed. The portion has an independent and closed outline, which is characterized in that it is located away from the outer peripheral edge of the fibrous nonwoven sheet.

The fibrous nonwoven fabric sheet according to the present invention includes the following preferred embodiments.
(1) It is made of spunlace fiber non-woven fabric, and the concave line is bottomed. In such a case, when the dirt such as excrement is wiped off, the dirt that has entered the concave line does not adhere to the hand.
(2) The fiber density of the concave line is smaller than the fiber density of the region other than the concave line. In such a case, the concave line is easily extended when the sheet is pulled, and the width of the concave line can be widened.
(3) The symbol portion further has a symbol located surrounded by the outline. In such a case, it is possible to prevent the design from being deformed by wiping.
(4) The concave line is curved. In such a case, the designability is improved as compared with the case where the concave line is simply a straight line.
(5) The design portion is asymmetric with respect to a virtual line that divides the dimension of the fibrous nonwoven fabric sheet into two equal parts or a virtual line that divides the dimension of the second direction into two equal parts. In such a case, the design portion allows the user to grasp the vertical and horizontal directions of the sheet.
(6) The width dimension of the concave line changes in the extending direction. In such a case, the design is improved as compared with the case where the concave line is simply a straight line.
(7) The concave line has a plurality of slits. In such a case, the design portion retains the required design and the wiping area, and the area of the concave line is reduced, so that the sheet strength is improved.
(8) The symbol portion has a plurality of symbol portions, and some of the plurality of symbol portions overlap each other in a plan view. In such a case, the area ratio of the concave line becomes large in the overlapping portion, and the wiping property is more excellent.
(9) A wipe sheet used in a dry state or a wet state. In such a case, the design portion can function not only as a decorative area for imparting design to the sheet but also as a wiping area.

According to the fibrous nonwoven fabric sheet according to the present invention, the design portion is composed of concave lines formed by fiber entanglement, has an independent and closed outline, and the outline is located away from the outer peripheral edge of the sheet. Therefore, the sheet as a whole has a good touch and has a high design.

The perspective view of the wipes sheet which shows as an example of the fiber nonwoven fabric sheet which concerns on this invention. Top view of the wipe sheet. (A) Cross-sectional view taken along the line III (a) -III (a) of FIG. (B) Cross-sectional view taken along the line III (b) -III (b) of FIG. The perspective view of the water flow injection process in a part of the manufacturing process of a wipes sheet. (A) In the suction drum, an enlarged view of the fiber web on the linear convex portion before the water flow is sprayed. (B) In the suction drum, an enlarged view of the fiber web on the linear convex portion after the water flow is sprayed. The same plan view as FIG. 2 in the example of the modification. The same plan view as FIG. 2 in another modification. The same plan view as FIG. 2 in still another modification.

Referring to FIGS. 1 to 3, the wipes sheet (wiping sheet, non-woven fabric for wipes) 10 shown as an example of the fibrous nonwoven fabric sheet of the present invention is a bulky and flexible sheet formed by entwining fibers. , The first direction X and the second direction Y intersecting each other, the thickness direction Z, and the first and second surfaces 11 and 12 facing each other in the thickness direction Z. In the present specification, the first surface 11 is also referred to as a wiped surface, and the second surface 12 is also referred to as a non-wiped surface.

The wipes sheet 10 has a substantially rectangular shape, and has first and second edge edges 10a and 10b facing each other in the second direction Y and extending in the first direction X, and the first and second edge edges 10a and 10b facing each other in the first direction X. It has an outer peripheral edge consisting of first and second side edges 10c and 10d extending in two directions Y. The shape of the wipe sheet 10 is not limited to the illustrated example, and may have various known shapes such as a square, a circle, an ellipse, a triangle, and a polygon, and various sizes may be selected according to the intended use. can do.

The wipe sheet 10 is used in a dry state or a wet state, and can be used, for example, as a butt wipe sheet, a cleaning sheet, a disposable hand towel, or the like. Further, the fibrous nonwoven fabric sheet according to the present invention can be suitably used not only for wipes but also as a sheet material constituting sanitary products such as sanitary napkins and surface sheets arranged on the skin-facing surface side of disposable diapers. ..

When the wipes sheet 10 is used as a wet wipe, the agents impregnated therein include, for example, a surfactant, a moisturizer, a refreshing sensation imparting agent such as ethanol for giving a refreshing sensation to the skin, an emollient agent, and PH. A conditioner, a fragrance, an antioxidant, a chelating agent, a plant extract, a browning inhibitor, an anti-inflammatory agent, a skin activator, an astringent agent and the like can be used.

Referring to FIG. 3, the wipe sheet 10 has a first fiber layer 21 forming the first surface 11 side, a second fiber layer 22 forming the second surface 12 side, and a first fiber layer 21 and a second. It includes an intermediate fiber layer (third fiber layer) 23 located between the fiber layer 22 and the fiber layer 22. The first fiber layer 21, the second fiber layer 22, and the intermediate fiber layer 23 have a multilayer structure in which the fibers constituting them are three-dimensionally entangled with each other and composited.

For the first fiber layer 21 and the second fiber layer 22, a mixed fiber web of hydrophilic fibers and synthetic fibers can be used. As the material of the hydrophilic fiber, a water-absorbing fiber is preferable, and a recycled fiber such as a rayon fiber, a cotton fiber or the like can be used more preferably. As the synthetic fiber, in addition to polyester fiber, for example, polyethylene terephthalate (PET), polyolefin fiber, for example, polypropylene (PP), polyethylene (PE) fiber, and core-sheath type composite fiber using these fibers are used. be able to. As the material for forming the sheath portion of the composite fiber, a material having a lower melting temperature than the material for forming the core portion is used.

Examples of the core-sheath type composite fiber include a combination of polyethylene and polypropylene, polyethylene and polyester, and polypropylene and polyester. The "synthetic fiber" includes a fiber in which the material of the fiber itself has hydrophobicity and the material is treated with a hydrophilic agent. Examples of the hydrophilization treatment of the fiber made of the material include a fiber having a hydrophilic agent (oil agent) attached to the surface of the fiber and a fiber containing a hydrophilic agent (oil agent).

In the present embodiment, the first and second fiber layers 21 and 22 are preferably a fiber web in which rayon fibers and PET (polyethylene terephthalate) fibers are confused at a ratio (mass%) of 20:80 to 80:20. Is formed from. As described above, by mixing the PET fiber which is a thermoplastic resin fiber and the rayon fiber which is a regenerated fiber, the concave line 18 forming the pattern area 40 is familiar with a certain amount of liquid even if the amount of fiber is small. Ease can be ensured. PET fiber is one of the most produced polyester fibers among synthetic fibers, and has excellent strength, heat resistance, water resistance, acid resistance, alkali resistance, etc., and is suitable as a sheet material for wipes sheet 10. Is.

The intermediate fiber layer 23 is formed of hydrophilic fibers such as rayon, cotton and pulp, preferably pulp fibers, and the pulp fibers used are wood pulps in addition to the commonly used broadleaf and coniferous wood fibers. Plant fibers other than fibers, synthetic fibers (preferably hydrophilized) and the like can be combined. Since the pulp fibers are short and the number of fibers per unit area is large, the whiteness of the intermediate fiber layer 23 is relatively high, and the visibility of the design area 40 can be improved. In addition to pulp fiber, Manila hemp, mulberry, mitsumata, and linter pulp may be mixed.

Since the first and second fiber layers 21 and 22 are mainly composed of hydrophobic fibers, the hydrophobic layer and the intermediate fiber layer 23 are mainly composed of hydrophilic fibers, so that they can be said to be hydrophilic layers. ..

The thickness dimension D1 of the wipe sheet 10 is 0.3 to 1.0 mm, the mass is 40 to 60 g / m ² , and the apparent density is 0.03 to 0.09 g / cm ³ . A thickness measuring instrument (manufactured by PEACOCK, measuring surface φ44 mm, measuring pressure 3 g / cm ³ ) was used for measuring the thickness dimension D1 of the wipe sheet 10.

The average fineness of the rayon fiber and PET fiber used for the first and second fiber layers 21 and 22 is 1.5 to 2.5 dtex, and the average fiber length of the rayon fiber and PET fiber is 20 to 50 mm, preferably 20 to 50 mm. , 35-45 mm. The average fiber length of the pulp fiber is 1 to 10 mm, preferably 2 to 5 mm. By making the average fineness and the average fiber length of the constituent fibers of the first and second fiber layers 21 and 22 forming the first and second surfaces of the wipes sheet 10 larger than those of the constituent fibers of the intermediate fiber layer 23, the texture is formed. (Fiber unevenness) becomes good, and the difference in the amount of fibers of the concave line 18 constituting the design area 40 can be suppressed, and the required visibility and shape stability can be ensured.

Referring to FIGS. 2 and 3, the wipe sheet 10 has a symbol area 40 formed from a concave line 18 that is concave toward the second surface 12 on the first surface 11. The concave line 18 is formed by entanglement of fibers and has a bottomed bottom portion 18a and both wall portions 18b and 18b surrounding the bottom portion 18a.

"The concave line is bottomed" means that a continuous opening is not formed in the extending direction of the concave line 18, and the fibers of various sizes formed by the reorientation of the fibers in the fluid injection step are formed. Even if it has a gap, it can be said to be bottomed if continuous openings are not formed in the extending direction. As described above, since the concave line 18 is bottomed, for example, when the wipe sheet 10 is used for the butt wipe sheet, the excrement that has entered the concave line 18 after wiping is applied to the user's finger. It does not adhere.

The symbol area 40 has a first symbol portion 41 and a second symbol portion 42 having different designs from each other. The first symbol portion 41 has a substantially circular outer line 41A formed from the concave line 18 and a substantially star-shaped symbol 41B surrounded by the outer line 41A. The second symbol portion 42 has a substantially elliptical outer line 42A and a symbol 42B surrounded by the outer line 42A and in which a plurality of characters are arranged in a plurality of rows arranged in the second direction Y. The first symbol portion 41 and the second symbol portion 42 are located side by side in the substantially center of the first direction X.

The symbol area 40 further includes a third symbol portion 43 formed from a part of the first and second symbol portions 41 and 42, and a heart-shaped relatively small fourth symbol portion 44. The first and second design portions 41 and 42 have a relatively large area on the first surface 11, and are mainly capable of exhibiting perfect design and impressing the user by themselves. It can be said that it is a design. On the other hand, the third design portion 43 is incomplete and does not exhibit arbitrary design by itself, and the fourth design portion 44 is relatively small and has a design that impresses the user by itself. Since it cannot be said that the design exhibits the property, it can be said that the third and fourth symbol portions 43 and 44 are secondary symbols.

The first and second symbol portions 41 and 42 have independent and closed outlines 41A and 42A, and the outlines 41A and 42A are located apart from the outer peripheral edge of the wipe sheet 10. Here, the fact that the outer lines 41A and 42A of the first and second design portions 41 and 42 are independent means that they extend to the outer peripheral edge of the fabric like the ground pattern of the woven fabric and grasp the entire outer shape thereof. It does not mean a continuous pattern that cannot be formed, but a pattern that is located away from the outer peripheral edge of the wipe sheet 10 and has a completely independent design. Therefore, for example, a third design portion 43 in which the outer line 43A reaches the outer peripheral edge of the sheet and the overall design cannot be grasped does not correspond to an independent outer line.

Further, the fact that the outline lines 41A and 42A of the first and second symbol portions 41 and 42 are closed means that the outline lines 41A and 42A extend continuously or discontinuously so as to surround the symbols 41B and 42B. Means that. The outline lines 41A and 42A may have various known shapes such as a circle, an ellipse, a triangle, and a polygon as long as they have an embodiment surrounding the symbols 41B and 42B.

It is preferable that the symbols 41B and 42B of the first and second symbol portions 41 and 42 have a design that can be recognized by the user at first glance. Includes logos for corporate promotion, various known design designs, characters, figures, symbols, and designs with a message by combining them. The characters include alphabetic characters, hiragana characters, katakana characters, Chinese characters and characters in other languages (for example, Indonesian characters) and the like.

In the wipes sheet 10, the first and second design portions 41 and 42 are the main design areas having a three-dimensional shape, and can also be said to be a wiping area for wiping excrement and dust. That is, when the wipe sheet 10 is used, the first surface 11 is used as the wiping surface, and the dirt adhering to the wiped surface such as the body or the table is removed from the edges of the concave line 18 on both side wall portions 18b on the first surface 11 side. The (edge) 18c can be used to effectively wipe off dirt.

In order for the user to press the first symbol portion 41 or the second symbol portion 42 with a finger and efficiently wipe off the dirt adhering to the wiped surface, the first and second symbol portions 41 and 42 have the required sizes. For example, it is preferable to have an area of at least 10% or more of the surface area of the wipe sheet 10. On the other hand, since the fourth symbol portion 44 has a relatively small area, it does not function as a main wiping area.

Usually, a spunlace fiber non-woven fabric formed by a water flow entanglement treatment is preferably used for the wipe sheet in consideration of bulkiness and softness, and in order to improve its design and wiping property, the surface of the sheet is covered with a spunlace fiber non-woven fabric. It is known that a three-dimensional pattern that is raised as a whole from the surface of a sheet is imparted by fiber entanglement, or an uneven pattern such as a geometric pattern or a lace pattern is imparted.

When the wipes sheet is provided with a three-dimensional pattern raised from the surface of the sheet, the design is further improved as compared with the printed pattern, and the dirt can be wiped off by the raised outer peripheral edge portion. However, since the design itself has a raised shape, it may be in sliding contact with the wiped surface at the time of wiping, and the shape of the design portion may be deformed by friction.

On the other hand, when the wipes sheet is provided with a continuous uneven pattern, the design is not completely independent as a pattern, so that the user cannot be strongly impressed with the design. In addition, since it is continuously applied in the machine direction by a fluid at the time of manufacturing, the design can be exhibited only by having a completely independent aspect, for example, a high design such as a character, a character, a symbol, etc. It is not possible to adopt something that has sex or message.

Further, the wipes sheet may be heat-embossed (debossed) to form a pattern portion consisting of a plurality of concave lines. In such a case, the constituent fibers are heat-welded by the heat embossing to form a concave shape. The inside of the line becomes relatively hard, and the original flexibility and texture of the spunlace non-woven fabric is impaired. In addition, when used as a sheet for wiping the buttocks of infants, the embossed portion may hit the skin and cause discomfort or irritation, and is easily torn.

In the wipe sheet 10 according to the present embodiment, since the concave line 18 forming the design area 40 is formed by entanglement of fibers, the non-woven fabric as a whole is compared with the case where it is formed by thermal embossing treatment. It is flexible and has a good touch, and can maintain the drape property peculiar to spunlace non-woven fabric. Further, since the first and second design portions 41 and 42 have independent outlines 41A and 42A, it is possible to adopt a design having a completely independent aspect, and it becomes a mere continuous pattern extending to the outer peripheral edge of the seat. In comparison, it is excellent in design and can improve the aesthetic appearance.

When the design area 40 itself is raised, light may be scattered and its outer contour may be blurred, but since it is formed by the concave line 18, the outer contour is made clearer to the user. Can be grasped by. Further, since the portion other than the concave line 18 is directly in contact with the wiped surface at the time of wiping, the shape of the concave line 18 is not deformed by friction and the design area 40 is not significantly deformed.

In the first and second symbol portions 41 and 42, the outlines 41A and 42A are closed, and the symbols 41B and 42B are arranged so as to be surrounded by the outlines 41A and 42A. Since the symbols 41B and 42B are surrounded by the outlines 41A and 42A, even when the user pulls or kneads the wipes sheet 10 to deform the wipe sheet 10, the outlines 41A and 42A are the starting points. Therefore, the symbols 41B and 42B can maintain their shapes. Further, even if the wiped surface is rubbed relatively strongly at the time of wiping and the shapes of the outer lines 41A and 42A are deformed, it is possible to suppress the shape of the symbols 41B and 42B surrounded by them from being deformed.

Further, the third and fourth symbol portions 43 and 44 are located around the first and second symbol portions 41 and 42, which are the main wiping areas. Therefore, when the wipe sheet 10 is kneaded, the third and fourth symbol portions 43 and 44 are deformed as starting points, and the deformation of the first and second symbol portions 41 and 42 located at the center is suppressed. It can be said that it is possible.

The first and second symbol portions 41 and 42 preferably have a curved concave line 18 from the viewpoint of wiping property and aesthetics. Also in this embodiment, the outlines 41A and 42A are curved, and the symbols 41B and 42B also have curved portions. As described above, by having the first and second symbol portions 41 and 42 having the curved concave line 18, it is possible to give a flexible and comfortable impression to the skin, and the first and second symbol portions 41 and 42 are deformed according to the shape of the wiped surface. For example, the first and second symbol portions 41 and 42 can be easily deformed along the narrow and curved groove of the wiped surface to wipe off the dirt.

The user can easily recognize that the first surface 11 is a wiping surface by locating the symbol area 40 composed of the concave line 18 on the first surface 11 side. Therefore, it can be said that the design area 40 also has a function of inducing the user to use the first surface 11 as a wiping surface.

As described above, the first and second symbol portions 41 and 42 of the symbol regions 40 can function as wipe areas, but the third and fourth symbol portions 43 and 44 are also formed from the concave lines 18. Therefore, it has a certain degree of wiping property. Therefore, the user can appropriately select and use the most suitable one from the first to fourth symbol portions 41 to 44 according to the size of the stain at the time of wiping.

In the first and second symbol portions 41 and 42, the concave line 18 forming the outline lines 41A and 42A is wider as a whole than the concave line 18 forming the symbols 41B and 42B. Since the outlines 41A and 42A are relatively wide, it is possible to attract the attention of the user and further enhance the symbols 41B and 42B surrounded by the outlines 41A and 42A. Further, after the dirt is roughly wiped off by the outline lines 41A and 42A at the time of wiping, the persistent dirt can be scraped off by the relatively narrow and densely assembled patterns 41B and 42B located inside the outer lines 41A and 42A. ..

The symbol area 40 has a plurality of first to fourth symbol portions 41-44 having different designs, thereby dividing the dimension of the first direction X of the wipe sheet 10 into two equal parts, the first virtual line P and the second direction. It has an asymmetrical shape with respect to the second virtual line Q that divides the dimension of Y into two equal parts. Therefore, the user can be made to recognize the vertical direction and the width direction of the wipe sheet 10. As described above, the symbol area 40 may be asymmetric with respect to either the first virtual line P or the second virtual line Q as long as the vertical and horizontal directions of the wipe sheet 10 can be recognized.

In the wipe sheet 10, the second direction Y corresponds to the machine direction in the manufacturing process and the first direction X corresponds to the direction in which the machine direction intersects, and the constituent fibers are mainly oriented in the second direction Y. .. Therefore, it is preferable that the wiping direction is the direction in which the fibers are oriented and the sheet strength is along the second direction Y, which is higher than the first direction X. By arranging the pattern area 40 asymmetrically, the second direction Y is the wiping direction. It can be recognized as (vertical direction). Further, by arranging the design elements so that the second direction Y is in the vertical direction, as in the design 42B of the second design portion 42, it is possible to induce the design element to be wiped in the second direction Y. In such a case, it can be said that the second symbol portion 42 is asymmetric with respect to the virtual line (not shown) that divides the dimension of the first direction X into two equal parts.

Referring to FIG. 1, the concave line 18 forming the symbol area 40 has a first portion 81 extending in the second direction Y and a second portion 82 extending in the first direction X. The fiber orientation in the second portion is the second direction Y, and in the first portion 81, the number of fibers oriented in the second direction Y is smaller than that in the second portion 82 per unit area. .. As described above, in the second portion 82, since the fiber orientation is the second direction Y, when the second direction Y is set as the wiping direction, the required tensile strength is exhibited and the concave shape is not collapsed.

Therefore, for example, when a character design or the like in which the second direction Y is up and down is adopted as the symbols 41B and 42B of the first and second symbol portions 41 and 42, the upper and lower portions (for example, the head and the body) are used. The outer contour and the vertical dimensional balance are not lost, and the design shape can be maintained even after wiping or, for example, when the design shape is taken out from the packaging so that frictional resistance occurs in the second direction Y.

Even in the first portion 81 of the concave line 18, when the second direction Y, which is the direction in which the fibers are oriented, is set as the wiping direction, the shape is not easily deformed and the width dimension tends to be narrow. On the other hand, when the first direction X is the wiping direction and a pulling force acts on the concave line 18 in the direction crossing the direction in which the fibers are oriented, the width dimension of the first portion 81 Spreads. Therefore, when adopting a character design in which the second direction Y is up and down as the symbols 41B and 42B, when the design is taken out from the packaging package after wiping or so as to cause frictional resistance in the first direction X or the second direction Y. Is designed so that its width dimension is expanded, but its appearance image is maintained, and rather it can be changed to a rounded character design preferred by infants.

Here, the fiber orientation is the direction in which the fibers are flowing in the plan view of the wipes sheet 10, and "the fiber orientation of the second portion is the second direction Y" constitutes the second portion. Of the total weight of the fibers to be formed, 100% is fiber-oriented in the second direction Y, and 50% or more has fiber orientation in the range of −45 ° to + 45 ° with respect to the second direction Y. Including things. Such fiber orientation can be measured by a method known in this field, for example, a measuring method according to the fiber orientation test method based on the zero-distance tensile strength of the TAPPI standard method T481. Further, as a simple method, the fiber orientation is determined from the tensile strength ratio (first direction X / second direction Y) between the first direction X and the second direction Y of the second part by using the tensile tester described later. It may be measured.

The first portion 81 is a portion extending along the first virtual line P when it is linear, and the second portion 82 is along the second virtual line Q when it is linear. It is a part that extends. On the other hand, for example, in the case of having a curved shape like the outlines 41A and 42A of the first and second symbol portions 41 and 42, the first portion 81 is a portion that is convex in the first direction X. The second portion 82 is a portion that is convex in the second direction Y.

Although not shown, as the symbols 41B and 42B of the first and second symbol portions 41 and 42, those composed of an ideological combination of the graphic design and the characters may be adopted. For example, in a graphic design in which a character holds a heart-shaped placard in both hands, by arranging characters such as "I love you! / I LOVE YOU!" In the placard, the graphic design and the characters correspond to each other. By recalling a common idea, it is possible to improve the design and motivate the user to purchase, and at the same time, it is possible to attract the interest of the infant who is the user.

In addition, for example, along with the character design of a smile, we adopted a design consisting of a combination of characters such as "Good morning" and "Feast", which are part of the daily conversation between the mother who is the user and the infant who is the user. You can also do it. In this way, for example, a word that the infant does not yet remember or has just memorized can be adopted in the symbols 41B and 42B, and the word can be fixed in the memory of the infant by repeating it with the parent and child at the time of use. As described above, the design area 40 can also have a function as one of the tools capable of creating a conversation between the parent and child through the wipe sheet 10 and achieving good communication.

As described above, since the wipes sheet 10 has a highly visible and unique design, unlike the conventional wipes sheet, it is a high-class handkerchief with a seamlessly formed design portion. It has an aesthetic appearance like that. Therefore, by achieving differentiation from other products, even if the user is a relatively young female, he / she does not hesitate, but rather actively carries and uses the wipe sheet 10 when going out. be able to. Further, when the logo design of the company is adopted as the design area 40, the user can effectively recognize the brand, and an excellent advertising function can be exhibited. Therefore, it can be said that the wipes sheet 10 has both a basic function as a wipe and an emotional value that motivates consumers to purchase.

Again, referring to FIG. 3, the wipes sheet 10 has a higher fiber density than the low density regions 51 located at the bottom 18a of the concave line 18 and the low density regions 51 located at least on both sides of the low density regions 51. It has a density region 52 and a medium density region 53 having a higher fiber density than the low density region 51 and a lower fiber density than the high density region 52. That is, the fiber density is the lowest at the bottom 18a of the concave line 18, and the high density region 52 having the highest fiber density is located at least on both sides so as to surround the outer peripheral edge of the bottom 18a.

The wipe sheet 10 has such a fiber density difference, and the high density region 52 is located so as to surround the bottom 18a of the concave line 18 composed of the low density region 51, and the contrast due to the density difference is formed. In terms of appearance, the high-density region 52 is darkly visible so as to border the outer peripheral edge of the concave line 18 (bottom 18a) due to the density of the fibers, and the outline of the concave line 18 can be clearly seen.

Further, the high-density region 52 has a protruding portion 54 protruding outward from the medium-density region 53 on the second surface 12 side. As described above, since the high-density region 52 has a three-dimensional shape protruding outward on the second surface 12 side, when the user views it from the second surface 12 side on which the concave line 18 is not formed. Even so, the contour of the concave line 18 can be grasped. Therefore, in combination with the contrast due to the shade of color due to the density difference between the high density region 52 and the low density region 51, the contour of the concave line 18 is more clearly visible not only from the first surface 11 but also from the second surface 12. Can be made to.

Although not shown, when the wipe sheet 10 is used, it may be used by bending it in two with the second surface 12 which is a non-wiping surface inside. In such a usage mode, the second surfaces 12 of the folded portions may come into contact with each other, and the contact portions may be displaced during the wiping operation, so that sufficient force may not be applied to the wiped surface. .. In the wipes sheet 10, the protruding portion 54 of the high-density region 52 located on the second surface 12 side functions as a stopper that is caught on the facing surface and prevents the folded portions from sliding, and is applied during the wiping operation. It is possible to suppress the displacement between the sheets and to sufficiently transmit the force to the wiped surface to wipe.

In the present embodiment, in one wipe sheet 10, there are a plurality of design portions 41, 42 having independent and closed outlines 41A, 42A, but at least in consideration of designability and wiping property. It suffices if one symbol portion 41, 42 exists. Further, by having the design area 40 having a different design for each wipe sheet 10, when the user takes out the wipes sheet 10 from the container containing the plurality of wipe sheets 10, those having different designs are pulled out one after another. Therefore, the user can pop up while having fun.

<Manufacturing method of wipes sheet>
The wipe sheet 10 according to the present invention is a manufacturing apparatus similar to a fiber nonwoven fabric sheet for wipes usually used in this kind of field, for example, a fiber web forming section, a water supply section for impregnating a fiber web with water, and a fiber. A manufacturing apparatus including a water flow injection unit (process), a dehydration unit (dehydrator), and a drying unit (dryer) for entwining and rearranging the fibers can be used. A part of the manufacturing apparatus and manufacturing process of the wipes sheet 10 will be described below.

First, as a base material of the wipe sheet 10, a fiber web formed by laminating fiber aggregates produced by various known manufacturing methods is formed. The fiber web includes, for example, a fiber aggregate formed by the curd method, a fiber aggregate formed by the air raid method, a fiber aggregate formed by a wet method, a spunbond method, a fiber aggregate formed by the melt blown method, and the like. Can be laminated and formed. In the present embodiment, the fiber web serves as a base material for the intermediate fiber layer 23 between the fiber aggregates formed by the curd method, which is the base material for the first and second fiber layers 21 and 22 of the wipe sheet 10. It has a multi-layered structure in which fiber aggregates formed by the airlaid method are interposed and laminated.

The fiber web is preferably impregnated with water prior to the water jet step for shaping the concave portion corresponding to the fiber entanglement and the concave line 18 forming the pattern area 40. By impregnating the fiber web with water before the fibers are entangled in the water flow injection step, the fiber gaps are filled with water and the fiber density is increased. As a result, in the water flow injection step, it is possible to prevent the fibers from being scattered by the water flow, making the fiber density of the fiber web non-uniform, and disturbing the texture of the fiber web. As described above, when water is impregnated in advance, the purpose is to fill the fiber gaps with water, so that water pressure is not required to move the fibers, and water may be sprayed by spraying.

FIG. 4 is a perspective view of the water flow injection step 100 in which the concave portion 122 corresponding to the concave line 18 of the design area 40 is formed on the fiber web 101. The water flow injection step 100 includes a suction drum 106 that holds the fiber web conveyed in the mechanical direction MD on the outer peripheral surface, and a nozzle plate 107 that injects water flow onto the fiber web located on the outer peripheral surface of the suction drum 106. The fiber web 101 has a first surface 101a facing the nozzle plate 107 on the outer peripheral surface of the suction drum 106, and a second surface 101b facing the outer peripheral surface of the suction drum 106 located on the opposite side thereof.

The suction drum 106 includes a shaped support 106a having a linear protrusion 120. The outer peripheral surface of the shaped support 106a has a mesh shape having a plurality of suction tubes 121, and the fiber web 101 is sucked onto the shaped support 106a while rotating the shaped support 106a around the axis K1 to suck the outer peripheral surface. While being held on the surface, it is conveyed to the dehydrator (not shown) via the downstream conveying means (not shown). The nozzle plate 107 ejects water toward the first surface 101a side of the fiber web 101 held on the outer peripheral surface of the suction drum 106 to entangle the fibers and is located on the outer peripheral surface of the shaping support 106a. By pressing against the linear convex portion 120, an uneven pattern is imparted to the second surface 101b side of the fiber web 101. The linear convex portion 120 is formed integrally with or separately from the outer peripheral surface of the shaping support 106a.

Although not shown, the fiber web 101 further conveyed to the machine direction MD by the conveyor belt of the dehydrator is conveyed to the dryer when used as a wipe sheet to be used in the dry state, while being in the wet state. When used as the wipes sheet 10 used in the above, it is transported to a liquid supply means for impregnating a liquid containing a drug or a fragrance with or without a dryer. After going through these steps, the fiber web is cut to a suitable size by cutting means. In the dryer, a part of the heat-sealing fibers constituting the fiber web 101 is heat-sealed to improve the sheet strength.

In the nozzle plate 107, a plurality of nozzles arranged in the crossing direction CD inject water to the first surface 101a of the fiber web 101 held on the outer peripheral surface of the shaping support 106a of the suction drum 106. The fiber web 101 is a suction drum (not shown) located upstream of the suction drum 106, where the fibers are preliminarily entangled and the fibers are entangled with each other with a weak force to be flat as a whole. The fiber web 101 is pressed against the linear convex portion 120 located on the outer peripheral surface of the shaping support 106a by the water flow ejected from the nozzle plate 107 while being sucked from the tube 121.

5 (a) is an enlarged view of the fiber web 101 on the linear convex portion 120 before the water flow is injected in the suction drum 106, and FIG. 5 (b) is a line after the water flow is injected in the suction drum 106. FIG. 3 is an enlarged view of the fiber web 101 on the convex portion 120.

Referring to FIGS. 5A and 5B, since the fibers are not sucked in the linear convex portion 120, the fibers located on the linear convex portion 120 are rearranged so as to move to the periphery. A concave portion 122 that is concave toward the first surface 101a is formed on the second surface 101b side of the fiber web 101 corresponding to the linear convex portion 120.

The linear convex portions 120 have different designs corresponding to the first, second and fourth symbol portions 41, 42, 44 of the wipe sheet 10, and the first, second and third linear convex portions 120a, 120b, It has 120c. Since the linear convex portion 120 is a portion protruding from the outer peripheral surface of the shaping support 106a, various designs such as a character and a company logo are adopted in addition to the illustrated embodiment to shape the fiber web 101. be able to.

The linear convex portion 120 is arranged on the entire outer circumference of the shaping support 106a, and all the wipes sheets 10 manufactured are also arranged with a symbol portion having at least one independent and closed design. Has a pattern. Further, the height of the linear convex portion 120 is designed so that the line width and the height change in the extending direction according to the design to be shaped.

In the thin portion (bottom of the concave portion 122) 124 located on the linear convex portion 120 of the fiber web 101, the fibers move to the periphery due to the water flow and are not sucked by the suction pipe 121. The fiber density is lower than that of the region.

On the other hand, the fiber that has moved from the linear convex portion 120 is accumulated in the first portion 131 located on the outer peripheral edge thereof so as to surround the thin portion 124, and the fiber density is relatively high. Further, in the second portion 132 extending outward from the first portion 131, the fiber density is higher than that of the thin portion 124 and lower than that of the first portion 131.

Further, the pulp fibers located in the intermediate fiber layer of the fiber web 101 have a shorter fiber length than the heat-fused fibers located in the upper and lower layers, and the fibers are weakly entangled with each other in the fiber aggregate, so that the pulp fibers move due to water flow. It's easier to do. Therefore, in the low-density region consisting of the thin portion 124 located on the linear convex portion 120, the pulp fibers move so as to be blown to the periphery, and the mass of the pulp fibers is higher than that of the first and second portions 131 and 132. It is low.

By such a water flow injection step, a design pattern formed by entanglement of fibers can be formed on the fiber web 101, and the concave portion 122, the first portion 131, and the second portion 132 of the fiber web 101 are wipes, respectively. It corresponds to the concave line 18 (low density region 51), the high density region 52, and the medium density region 53 of the sheet 10.

Conventionally, in the manufacturing process of spunlace fiber nonwoven fabric, there is a method of shaping a concave pattern by pushing the fiber into a concave portion formed on a shaping support of a suction drum. In such a manufacturing method, since the fibers are sucked in the concave portion, the fibers are not present or a large opening extending in the extending direction of the concave portion is formed. Therefore, for example, when the concave portion is formed into an independent and closed shape in order to give an independent and closed pattern to the fiber web such as the symbol area 40 according to the present embodiment, the concave portion extends to the concave portion. A continuous opening is formed in the direction, and the portion surrounded by the concave portion may come off during the manufacturing process.

According to the present manufacturing method, the fibers are reoriented by the linear convex portions 120 arranged on the outer peripheral surface of the shaping support 106a of the suction drum 106, and the concave portion 122 is provided on the second surface 101b side of the fiber web 101. Because of the shape, the thin portion 124 located in the linear convex portion 120 is surrounded by the linear convex portion 120 during the manufacturing process without forming a relatively large opening in the extending direction thereof. The part will not come off. In this way, by shaping the fiber web 101 with the linear convex portions 120 that are convex toward the water flow, various designs that are independent and closed only by the entanglement of the fibers, for example, characters, letters, figures, and symbols. , These combinations can be adopted in various sizes.

As an example of the method for manufacturing the wipes sheet 10, a spunlace manufacturing method by water flow entanglement was exemplified, but as long as the concave line 18 can be formed by fiber entanglement by fluid treatment, in addition to water, air, steam, etc. A fluid manufacturing method can also be adopted.

<Modification example>
FIG. 6 is a plan view of the wipes sheet 10 similar to FIG. 2 in one example of the modification. In this modification, the width dimension of each concave line 18 forming the symbol area 40 changes in the extending direction thereof. Specifically, the concave line 18 forming the outlines 41A and 42A of the first and second symbol portions 41 and 42 and the concave line 18 forming the symbols 41B and 42B are wide portions 61 arranged in the extending direction thereof. And a narrow portion 62. As described above, by changing the width dimension in the extending direction of the concave line 18, the designability is improved as compared with the case where the concave line 18 has a simple linear shape or a curved shape. Further, since the concave line 18 has a plurality of wide portions 61, the scraping area becomes large, and it becomes easier to scrape the persistent dirt at the bending portion near the boundary between the narrow portion 62 and the wide portion 61. Excellent in takeability.

FIG. 7 is a plan view of the wipes sheet 10 similar to FIG. 2 in another modified example. In this modification, each concave line 18 forming the symbol area 40 has a plurality of slits 70 in the extending direction thereof. From the viewpoint of designability and wiping property, the design area 40 is preferably continuously extended in the extending direction, but the plurality of slits 70 may be arranged and discontinuously extended in this way. In such a case, since the concave line 18 forming the symbol area 40 has a discontinuous shape, the overall area is reduced as compared with the case where it has a continuous shape, so that the sheet strength is improved. sell.

FIG. 8 is a plan view of the wipes sheet 10 similar to FIG. 2 in still another example of modification. In this modification, a part of the first symbol portion 41 and a part of the second symbol portion 42 are positioned so as to overlap each other in a plan view. In this way, by forming a portion where the first symbol portion 41 and the second symbol portion 42 overlap each other, the proportion of the concave line 18 per unit area of the wipe sheet 10 is large in the overlapping portion. By doing so, the wiping efficiency can be improved.

In the present specification, the technical effect as the wipes sheet 10 has been focused on, but the fibrous nonwoven fabric sheet according to the present invention is not limited to wipes, but is hygienic for sanitary napkins, disposable diapers, breast milk pads and the like. It can also be used as a constituent material for supplies. In particular, since the first and second symbol portions 41 and 42 of the symbol region 40 have independent and closed outer lines 41A and 42A formed by the concave lines 18 due to the entanglement of fibers, the design is flexible as a whole. It is excellent and can be suitably used as a sheet material in contact with the skin among hygienic products.

Unless otherwise specified, each component constituting the wipes sheet 10 includes various known materials commonly used in this field in addition to the materials described in the present specification. It can be used without limitation. Further, the terms "first", "second" and "third" used in the present specification and claims are used only for distinguishing similar elements, positions and the like.

10 Fiber non-woven fabric sheet (wipe sheet)
11 1st surface 12 2nd surface 18 Concave line 40 Design area 41 1st design part (design part)
42 Second design part (design part)
41A, 42A Outline lines 41B, 42B Design 61 Wide part 62 Narrow part 70 Slit P 1st virtual line Q 2nd virtual line X 1st direction Y 2nd direction Z Thickness direction

Claims (10)

In a fibrous nonwoven fabric sheet having a first surface and a second surface facing each other in the thickness direction and formed by water flow entanglement of fibers.
It has a design portion formed from a concave line that is concave toward the second surface on the first surface.
The concave line is formed by fiber entanglement and
The fibrous nonwoven fabric sheet is characterized in that the design portion has an independent and closed outer line, and the outer line is located away from the outer peripheral edge of the fibrous nonwoven fabric sheet. The fibrous nonwoven fabric sheet according to claim 1, which is made of spunlaced fibrous nonwoven fabric and has a bottomed concave line. The fibrous nonwoven fabric sheet according to claim 1 or 2, wherein the fiber density of the concave line is smaller than the fiber density of a region other than the concave line. The fibrous nonwoven fabric sheet according to any one of claims 1 to 3, wherein the symbol portion further has a symbol located surrounded by the outline. The fibrous nonwoven fabric sheet according to any one of claims 1 to 4, wherein the concave line is curved. 13. Fiber non-woven sheet. The fibrous nonwoven fabric sheet according to any one of claims 1 to 6, wherein the concave line has a width dimension that changes in the extending direction. The fibrous nonwoven fabric sheet according to any one of claims 1 to 7, wherein the concave line has a plurality of slits. The fibrous nonwoven fabric sheet according to any one of claims 1 to 8, wherein the symbol portion has a plurality of symbol portions, and some of the plurality of symbol portions overlap each other in a plan view. The fibrous nonwoven fabric sheet according to any one of claims 1 to 9, which is a wipes sheet used in a dry state or a wet state.

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