JP7138434B2 - fiber nonwoven sheet - Google Patents

Description

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

Conventionally, fibrous nonwoven sheets formed by entangling fibers are known. For example, Patent Document 1 discloses a fibrous nonwoven fabric sheet having an uneven pattern formed by rearrangement of some fibers by hydroentangling in a manufacturing process of a fibrous web formed by entangling fibers. ing.

JP 2013-241724 A (P2013-241724A)

In the fibrous nonwoven fabric sheet disclosed in Patent Document 1, since it is formed by entangling fibers as a whole, it has relatively excellent flexibility. By having an uneven pattern consisting of a plurality of uneven lines extending in the machine direction in which the web is conveyed and alternately arranged in a direction crossing the machine direction, compared to a non-patterned fibrous nonwoven fabric sheet Excellent design.

However, the rugged pattern is a continuous pattern that extends to the outer edge of the sheet, and the outline of the entire pattern cannot be grasped. For this reason, users do not perceive it as a unique design attached to each sheet, but as a background pattern that is a repetition of a simple design attached to the continuous fiber web, which is highly designable. It cannot be impressed as one. Further, since the uneven pattern is formed continuously in the machine direction by the fluid ejected from the ejection nozzle, the width dimension of the concave lines cannot be changed.

On the other hand, in some cases, the width dimension of the line is changed in the extending direction by applying heat embossing in the manufacturing process to give a highly decorative uneven design. The fibers are heat-sealed and become relatively hard, and the original softness and drapeability of the fiber nonwoven fabric sheet are lost, resulting in poor touch and easy tearing.

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

In order to solve the above problems, the present invention relates to a fibrous nonwoven fabric sheet having a thickness direction and first and second surfaces facing each other in the thickness direction, and formed by hydroentangling fibers. .

In the fibrous nonwoven fabric sheet according to the present invention, a pattern portion is arranged on the first surface, the pattern portion has an independent outline line, and the line forming the pattern portion extends in the extending direction , wherein the pattern portion further has a pattern positioned surrounded by the contour line, and the contour line is positioned closer to the line than the line forming the pattern positioned surrounded by the contour line Wide.

The fibrous nonwoven fabric sheet according to the present invention includes the following preferred embodiments.
(1) Of the design elements that make up the pattern, the design elements with high priority to be particularly emphasized are formed with wider lines than other design elements.
( 2 ) The line forming the design portion is a concave line that is concave toward the second surface on the first surface, and the concave line is formed by entangling fibers. In such a case, compared with the case where the concave lines are formed by embossing, the softness and texture are excellent.
( 3 ) The line forming the design portion has a narrow portion and a wide portion wider than the narrow portion, and the width of the wide portion is the same as that of the narrow portion. It is at least 1.1 to 5.0 times the width dimension. In this case, the difference in width dimension between the wide portion and the narrow portion becomes clear, and the design is superior to the case where the concave line is simply straight.
( 4 ) The contour line is closed and positioned apart from the outer peripheral edge of the fibrous nonwoven fabric sheet. In such a case, the pattern portion has an independent and closed design, and is superior in designability to a continuous pattern.
( 5 ) It is made of spunlace fiber nonwoven fabric, and the concave line has a bottom. In such a case, when wiping off dirt such as excrement, dirt that has entered the concave lines will not adhere to the hand.
( 6 ) The fiber density of the concave lines is lower than the fiber density of regions other than the concave lines. In such a case, when the sheet is pulled, the concave lines are easily stretched, and the width of the concave lines can be increased.
( 7 ) The line forming the design portion has a plurality of slits. In such a case, the design portion maintains the required design and wiping area, while the area of the concave lines is reduced, thereby improving the sheet strength.
( 8 ) A wipe sheet used in dry or wet conditions. In such a case, the pattern portion can function not only as a decorative area that imparts design to the sheet, but also as a wiping area.

According to the fibrous nonwoven fabric sheet of the present invention, the design portion is located on the first surface, and the width dimension of the line forming the design portion varies. It has high designability compared to the case where it is used.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of the wipes sheet shown as an example of the fiber nonwoven fabric sheet which concerns on this invention. The top view of a wipe sheet. Enlarged view of the second pattern portion. (a) A sectional view along IV(a)-IV(a) in FIG. (b) A cross-sectional view taken along line IV(b)-IV(b) in FIG. FIG. 4 is a perspective view of a water jetting step in a part of the wipes sheet manufacturing process. (a) Enlarged view of the fiber web on the linear projections before the jetting of the water flow in the suction drum. (b) Enlarged view of the fiber web on the linear projections after the water flow is jetted on the suction drum. The top view similar to FIG. 2 in an example of a modification. The top view similar to FIG. 2 in another modification.

Referring to FIGS. 1 to 3, a wipe sheet (wiping sheet, nonwoven 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 entangling fibers. , a first direction X and a second direction Y which intersect each other, a thickness direction Z, and first and second surfaces 11 and 12 facing each other in the thickness direction Z. As shown in FIG. In this specification, the first surface 11 is also referred to as a wiping surface, and the second surface 12 is also referred to as a non-wiping surface.

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

The wipe sheet 10 is used in a dry state or a wet state, and can be used, for example, as a bottom wiping sheet, a cleaning sheet, a disposable wet towel, and the like. In addition, the fibrous nonwoven fabric sheet according to the present invention can be suitably used not only for wipes, but also as a sheet material for composing sanitary products such as sanitary napkins and top sheets placed on the skin-facing side of disposable diapers. .

When the wipe sheet 10 is used as a wet wipe, agents to be impregnated therein include, for example, surfactants, moisturizing agents, cooling sensation imparting agents such as ethanol for imparting a cooling sensation to the skin, emollient agents, PH One or more of modifiers, fragrances, antioxidants, chelating agents, plant extracts, anti-tanning agents, antiphlogistic agents, skin activators, astringents and the like can be used.

Referring to FIGS. 4A and 4B, the wipe sheet 10 includes a first fiber layer 21 forming the first surface 11 side, a second fiber layer 22 forming the second surface 12 side, and a second fiber layer 22 forming the second surface 12 side. It includes an intermediate fiber layer (third fiber layer) 23 positioned between the first fiber layer 21 and the second fiber layer 22 . The first fibrous layer 21, the second fibrous layer 22 and the intermediate fibrous layer 23 have a multi-layered structure in which the fibers constituting them are three-dimensionally entangled with each other to form a composite.

A mixed fiber web of hydrophilic fibers and synthetic fibers can be used for the first fiber layer 21 and the second fiber layer 22 . As a material for the hydrophilic fibers, water-absorbing fibers are preferable, and more preferably, regenerated fibers such as rayon fibers, cotton fibers, and the like can be used. Synthetic fibers include polyester fibers such as polyethylene terephthalate (PET), polyolefin fibers such as polypropylene (PP) and polyethylene (PE), and sheath-core conjugate fibers using these fibers. be able to. The material used to form the sheath of the composite fiber has a melting temperature lower than that of the material to form the core.

Examples of such core-sheath type conjugate fibers include combinations of polyethylene and polypropylene, polyethylene and polyester, and polypropylene and polyester. The term "synthetic fiber" includes those whose material itself is hydrophobic and which has been treated with a hydrophilizing agent. Examples of the hydrophilization treatment of fibers made of such materials include those in which a hydrophilizing agent (oil agent) is adhered to the surface of the fiber, and in which a hydrophilizing agent (oil agent) is contained in the fiber.

In this embodiment, the first and second fiber layers 21 and 22 are preferably fiber webs in which rayon fibers and PET (polyethylene terephthalate) fibers are mixed at a ratio (% by mass) of 20:80 to 80:20. is formed from In this way, by mixing the rayon fiber, which is a recycled fiber, with the PET fiber, which is a thermoplastic resin fiber, even if the amount of fibers of the concave lines 18 forming the pattern area 40 is small, a certain amount of liquid can be absorbed. Ease can be ensured. PET fiber is a type of polyester fiber with the highest production volume among synthetic fibers, and is excellent in strength, heat resistance, water resistance, acid resistance, alkali resistance, etc., and is suitable as a sheet material for wipes be.

The intermediate fiber layer 23 is made of hydrophilic fibers such as rayon, cotton, pulp, etc., preferably pulp fibers. Vegetable fibers other than fibers, synthetic fibers (preferably hydrophilized ones), and the like can be combined. Since the pulp fibers are short and the number of fibers per unit area is large, the degree of whiteness of the intermediate fiber layer 23 is relatively high, and the visibility of the design area 40 can be enhanced. In addition to pulp fibers, Manila hemp, kozo, mitsumata, and linter pulps may be mixed.

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

The wipe sheet 10 has a thickness D1 of 0.3 to 1.0 mm, a mass of 40 to 60 g/m ² and an apparent density of 0.03 to 0.09 g/cm ³ . The thickness dimension D1 of the wipe sheet 10 was measured using a thickness gauge (PEACOCK, measuring surface φ44 mm, measuring pressure 3 g/cm ³ ).

The average fineness of the rayon fibers and PET fibers used in the first and second fiber layers 21 and 22 is 1.5 to 2.5 dtex, and the average fiber length of the rayon fibers and PET fibers is 20 to 50 mm, preferably , 35-45 mm. The pulp fibers have an average fiber length of 1 to 10 mm, preferably 2 to 5 mm. By making the average fineness and 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 wipe sheet 10 larger than those of the intermediate fiber layer 23, the texture is improved. (Fiber unevenness) is improved, and the difference in the amount of fibers of the concave lines 18 forming the pattern area 40 can be suppressed, and the required visibility and shape stability can be secured.

2 and 3, the wipe sheet 10 has a pattern area 40 on the first surface 11. As shown in FIG. The pattern area 40 has a first pattern portion 41 and a second pattern portion 42 having different designs. The first pattern portion 41 has a substantially circular contour line 41A formed from the concave line 18 and a substantially star-shaped pattern 41B surrounded by the contour line 41A. The second design portion 42 has a substantially elliptical outline 42A and a design 42B formed of a plurality of characters, symbols, etc. arranged in the first direction X and surrounded by the outline 42A. The first pattern portion 41 and the second pattern portion 42 are positioned side by side substantially at the center in the first direction X. As shown in FIG. The design 42B has a first row located on the first edge 10a side and a second row located on the second edge 10b side.

The pattern area 40 further has a third pattern portion 43 formed from part of the first and second pattern portions 41 and 42 and a relatively small heart-shaped fourth pattern portion 44 . The first and second pattern portions 41 and 42 have a relatively large area on the first surface 11, and are mainly used because they alone can exhibit perfect design and impress the user. It can be said that it is a pattern. On the other hand, the third pattern portion 43 is incomplete and does not exhibit arbitrary design by itself, and the fourth pattern portion 44 is relatively small and designed to impress the user by itself. Therefore, the third and fourth pattern portions 43 and 44 can be said to be secondary patterns.

The designs 41B and 42B of the first and second design sections 41 and 42 preferably have designs that can be recognized by the user at first glance. , including corporate advertising logos, various well-known design designs, letters, figures, symbols, and designs with a message by combining them. Characters include alphabetic characters, hiragana characters, katakana characters, kanji characters, foreign language characters (eg, Indonesian characters), and the like.

The pattern area 40 is formed by a line whose width dimension changes in its extending direction. Specifically, the lines forming the outlines 41A and 42A of the first and second pattern portions 41 and 42 have a wide portion 61 and a narrow portion 62 aligned in the extending direction. By changing the width dimension of the outline lines 41A and 42A in this way, the designability is improved compared to the lines whose width dimension does not change. In addition, by surrounding the patterns 41B and 42B with the outlines 41A and 42A that are characteristic in appearance, the patterns 41B and 42B can be made more conspicuous.

Further, in the first and second pattern portions 41 and 42, the lines forming the patterns 41B and 42B are narrower than the lines forming the outlines 41A and 42A. Thus, by surrounding the patterns 41B and 42B with the relatively wide outlines 41A and 42A, the shapes of the patterns 41B and 42B can be more clearly visually recognized due to the contrast of the width dimension.

Referring to FIG. 3, among "Abc Ai 123" consisting of a combination of alphabet letters, hiragana letters and numbers forming the first row of the pattern 42B of the second pattern portion 42, "A" and "I" (design elements) 45) is formed by a wider line than the other letters and numbers. In addition, among the Chinese characters "Shochikubai" forming the second row of the pattern 42B, "Take" (design element 45) is formed by wider lines than the other Chinese characters.

In this way, among the design elements such as characters, symbols, and numbers that make up the pattern 42B, the design element 45, which has a high priority to be particularly emphasized, is formed with a wider line than the other design elements. A width contrast is produced, and the design element 45 can be effectively highlighted.

In order to make the patterns 41B and 42B stand out more due to the difference in line width between the wide portions 61 and the narrow portions 62 of the outlines 41A and 42A of the first and second pattern portions 41 and 42, the width dimension of the wide portion 61 is W1 is preferably 1.1 to 5.0 times, preferably 1.2 to 3.0 times, the width dimension W2 of the narrow portion 62 . Similarly, in order to make the design element 45 more conspicuous due to the difference in line width between the design element to be emphasized and the other design element 45 in the design 42B, the width dimension of the design element must be larger than the width dimension of the other design element. It is preferably 1.1 to 5.0 times larger, preferably 1.2 to 3.0 times larger.

Since the wide portion 61 and the narrow portion 62 have such a width dimensional ratio, the contrast due to the width dimensional difference between the wide portion 61 and the narrow portion 62 becomes clear, and the first and second pattern portions 41 and 42 are displayed. The patterns 41B and 42B can be emphasized without destroying the overall design of the pattern area 40.例文帳に追加

The width dimension W1 of the wide width portion 61 and the width dimension W2 of the narrow width portion 62 are each 0.5 to 5.0 mm, preferably 0.7 to 3.0 mm. If the width dimensions W1 and W2 are less than 0.5 mm, the recessed line 18 may be crushed or perforated, resulting in reduced visibility. During the wiping operation, there is a risk that the dirt wiped off and held by the concave line 18 may leak out to the outside.

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

In addition, when the outer lines 41A and 42A of the first and second pattern portions 41 and 42 are closed, the outer lines 41A and 42A extend continuously or discontinuously so as to surround the patterns 41B and 42B. means that The outlines 41A, 42A may have various known shapes such as circles, ellipses, triangles, and polygons as long as they surround the patterns 41B, 42B.

Referring to FIG. 4B, the line forming the pattern area 40 is a bottomed concave line 18 that is concave toward the second surface 12 on the first surface 11 and is formed by entangling fibers. . The concave line 18 has a bottom portion 18a with a bottom and both wall portions 18b, 18b surrounding the bottom portion 18a. The pattern area 40 may not be a concave line, but may be a convex line, or the pattern area 40 itself may be a first line, as long as the line forming the pattern area 40 has a form in which the width dimension changes in the extending direction. It may be an outline contour line represented three-dimensionally by having a shape protruding from the surface 11 .

"The recessed line has a bottom" means that continuous openings are not formed in the extending direction of the recessed line 18, and various large and small fibers formed by reorientation of the fibers in the fluid injection process. Even if there is a gap, it can be said to be bottomed if no continuous opening is formed in the direction in which it extends. As described above, since the concave lines 18 are bottomed, for example, when the wipe sheet 10 is used as a buttocks wiping sheet, excrement that enters the concave lines 18 after being wiped off can reach the fingers of the user. It will not stick.

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

In addition, the concave line 18 forming the pattern area 40 has a width dimension that varies in its extending direction, and has a plurality of wide portions 61, thereby increasing the scraping area and narrow portions 62 and wide width portions. Since it becomes easier to scrape off persistent stains at the curved portion near the boundary with the portion 61, the scraping property is excellent. Furthermore, in the first and second pattern portions 41 and 42, the concave lines 18 forming the outlines 41A and 42A are wider as a whole than the concave lines 18 forming the patterns 41B and 42B. In this case, after roughly wiping off dirt with the contour lines 41A and 42A, stubborn dirt can be scraped off with the relatively narrow and densely gathered patterns 41B and 42B located inside.

In order for the user to press the first pattern portion 41 or the second pattern portion 42 with a finger and efficiently wipe off the dirt adhering to the surface to be wiped, the first and second pattern portions 41 and 42 have a required size. 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 pattern portion 44 has a relatively small area, it does not function as a main wiping area.

In general, for wipe sheets, spunlace fiber nonwoven fabric formed by hydroentangling treatment is preferably used in consideration of bulkiness and texture. It is known to impart a three-dimensional pattern that is entirely raised from the surface of the sheet or to impart an uneven pattern such as a geometric pattern or a lace pattern by fiber entanglement.

When the wipes sheet is provided with a three-dimensional pattern raised from the sheet surface, the design is improved more than the printed pattern, and dirt can be wiped off by the raised peripheral edge. However, since the pattern itself has a protruded shape, the pattern may come into sliding contact with the surface to be wiped during wiping, and the shape of the pattern portion may collapse due to friction.

On the other hand, when a wipe sheet is provided with a continuous uneven pattern, the design cannot be strongly impressed on the user because the pattern is not completely independent. In addition, since it is continuously imparted in the machine direction by a fluid at the time of manufacture, it can exhibit its designability only when it has a completely independent aspect, such as characters, characters, symbols, etc. It is not possible to adopt anything that has a sexuality or a message.

Further, a wipe sheet may be thermally embossed (debossed) to form a pattern portion consisting of a plurality of concave lines. The inside of the line becomes relatively hard, and the original softness and texture of the spunlace nonwoven fabric are lost. In addition, when used as an infant's buttocks wiping sheet, the embossed portion may come into contact with the skin and cause discomfort or irritation, and may be easily torn.

In the wipe sheet 10 according to the present embodiment, the concave lines 18 forming the pattern area 40 are formed by entangling the fibers, so the nonwoven fabric as a whole is It is soft and has good texture, and can maintain drape properties unique to spunlace nonwoven fabrics. In addition, since the first and second pattern portions 41 and 42 have independent outlines 41A and 42A, it is possible to adopt a design having a completely independent aspect, and a simple continuous pattern extending to the outer peripheral edge of the sheet can be used. In comparison, the design is excellent and the aesthetic appearance can be improved.

If the pattern area 40 itself is raised, there is a risk that light will scatter and the outline will be blurred. It can be grasped more clearly. Further, since the portion other than the concave lines 18 is directly slidably contacted with the surface to be wiped during wiping, the shape of the concave lines 18 is not deformed due to friction and the pattern area 40 is not greatly deformed.

In the first and second pattern portions 41 and 42, the contour lines 41A and 42A are closed, and the patterns 41B and 42B are arranged so as to be surrounded by the contour lines 41A and 42A. Since the patterns 41B and 42B are surrounded by the contour lines 41A and 42A, even when the wipe sheet 10 is deformed by being pulled or kneaded by the user, the contour lines 41A and 42A are the starting points. , the patterns 41B and 42B can maintain their shapes. Further, even if the surface to be wiped is rubbed relatively strongly during wiping and the outlines 41A and 42A are deformed, the patterns 41B and 42B surrounded by them can be prevented from being deformed.

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

It is preferable that the first and second pattern portions 41 and 42 have curved concave lines 18 from the viewpoint of wiping property and beauty. Also in this embodiment, the outlines 41A and 42A are curved, and the patterns 41B and 42B also have curved portions. In this way, the first and second pattern portions 41 and 42 having the curved concave lines 18 can give an impression of softness and good contact with the skin, and can be deformed according to the shape of the surface to be wiped. For example, the pattern portions 41 and 42 can be deformed along narrow and curved grooves on the surface to be wiped to wipe off dirt without leaving any residue.

The user can easily recognize that the first surface 11 is the wiping surface by the pattern area 40 formed by the concave lines 18 being positioned on the first surface 11 side. Therefore, it can be said that the pattern area 40 also has a function of guiding the user to use the first surface 11 as a wiping surface.

As described above, the first and second pattern portions 41 and 42 of the pattern area 40 can function as wiping areas, but the third and fourth pattern portions 43 and 44 are also formed from the concave lines 18. Therefore, it has a certain degree of wiping ability. Therefore, the user can appropriately select and use the most suitable one of the first to fourth pattern portions 41 to 44 according to the size of the dirt when wiping off.

The pattern area 40 has a plurality of first to fourth pattern portions 41 to 44 with different designs, thereby dividing the dimension of the wipe sheet 10 in the first direction X into two by a first imaginary line P and a second direction. It has an asymmetrical shape with respect to a second imaginary line Q that bisects the Y dimension. Therefore, the user can recognize the vertical direction and the width direction of the wipe sheet 10 . As described above, the pattern area 40 may be asymmetrical with respect to either one of the first virtual line P and the second virtual line Q as long as the width and length 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 crossing the machine direction, and the constituent fibers are mainly oriented in the second direction Y. . Therefore, the wiping direction is preferably along the second direction Y, which is the direction in which the fibers are oriented and the sheet strength is higher than the first direction X. By asymmetrically arranging the pattern area 40, the second direction Y is wiping It can be recognized as the direction (vertical direction). Also, like the pattern 42B of the second pattern portion 42, by arranging the design element so that the second direction Y is the vertical direction, it is possible to guide the user to wipe in the second direction Y. In such a case, it can be said that the second pattern portion 42 is asymmetrical with respect to an imaginary line (not shown) that bisects the dimension in the first direction X thereof.

The concave line 18 forming the pattern area 40 has a first portion 81 extending in the second direction Y and a second portion 82 extending in the first direction X. As shown in FIG. The fiber orientation in the second portion 82 is in the second direction Y, and the number of fibers oriented in the second direction Y per unit area in the first portion 81 is smaller than that in the second portion 82. there is As described above, since the fibers are oriented in the second direction Y in the second portion 82, 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 adopting a character design or the like in which the second direction Y is vertical as the patterns 41B and 42B of the first and second pattern portions 41 and 42, the upper and lower parts (for example, the head and the body) The outer contour and vertical dimensional balance are not lost, and the design shape can be maintained even after wiping or, for example, when taken out from the packaging package so as to generate frictional resistance in the second direction Y.

Also 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 difficult to lose and the width 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 lines 18 in the first direction X, which is the direction intersecting the fiber orientation direction, the width dimension of the first portion 81 spreads. Therefore, when adopting a character design with the second direction Y up and down as the patterns 41B and 42B, after wiping or when taken out from the packaging package so that frictional resistance is generated in the first direction or the second direction Y, , the width dimension is expanded, but the appearance image is maintained, and the character design can be changed to a rounded one that babies prefer.

Here, the fiber orientation is the direction in which the fibers are flowing in the wipe sheet 10 when viewed from above, and "the fiber orientation of the second portion is in the second direction Y" means that the second portion is configured. Of the total weight of the fibers, 100% are oriented in the second direction Y, and 50% or more have 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 type of field, for example, a measurement method according to the fiber orientation test method by zero-distance tensile strength of TAPPI standard method T481. In addition, as a simple method, the fiber orientation can be determined from the tensile strength ratio (first direction X/second direction Y) in the first direction X and the second direction Y of the second portion using a tensile tester described later. may be measured.

The first portion 81 extends along the first imaginary line P when it is linear, and the second portion 82 extends along the second imaginary line Q when it is linear. It is the part that extends On the other hand, for example, when the first and second pattern portions 41 and 42 have curved shapes like the outlines 41A and 42A, the first portion 81 is a portion convex in the first direction X, The second portion 82 is a portion convexly curved in the second direction Y. As shown in FIG.

Although not shown, the patterns 41B and 42B of the first and second pattern portions 41 and 42 may be conceptual combinations of graphic designs and characters. 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!" Since it evokes a common idea, the design is improved and the user's willingness to purchase can be aroused, and the interest of the infant who is the user can be attracted.

In addition, for example, along with the smiling character design, we adopted a design that combines words such as "Good morning" and "Thank you for the meal" that are part of daily conversations between mothers who use the products and infants who use them. You can also In this way, for example, words that infants have not yet memorized or have just learned can be adopted as the patterns 41B and 42B, and the words can be fixed in the infant's memory by repeating them with parents and children when using. In this way, the pattern area 40 can also have a function as one of the tools that can create good communication between the parent and the child through the wipe sheet 10 .

As described above, the wipes sheet 10 has a design with high visibility and excellent originality. have an aesthetic appearance. Therefore, by realizing differentiation from other products, even if the user is a relatively young female, he/she can carry the wipe sheet 10 positively without hesitation when going out. be able to. Further, when a company's logo design is adopted as the pattern area 40, it is possible to effectively make the user recognize the brand, and an excellent advertising function can be exhibited. Therefore, it can be said that the wipe sheet 10 has both a basic function as a wipe and an emotional value that can arouse a consumer's willingness to purchase.

Again referring to FIG. 4(b), the wipe sheet 10 has a low density region 51 located at the bottom 18a of the recessed line 18 and a fiber density higher than that of the low density regions 51 located at least on both sides of the low density region 51. 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 bottom portion 18a of the recessed line 18 has the lowest fiber density, and high-density regions 52 having the highest fiber density are located at least on both sides so as to surround the outer periphery of the bottom portion 18a.

The wipe sheet 10 has such a difference in fiber density, and the high-density area 52 is positioned so as to surround the bottom 18a of the recessed line 18 composed of the low-density area 51 to form a contrast due to the density difference. In terms of appearance, due to the density of the fibers, the high-density area 52 is darkly visible as if edging the outer periphery of (the bottom 18a of) the concave line 18, so that the outline of the concave line 18 can be clearly seen.

Further, the high density region 52 has a protruding portion 54 that protrudes outward from the medium density region 53 on the second surface 12 side. Since the high-density region 52 has a three-dimensional shape protruding outward on the second surface 12 side, even when the user views from the second surface 12 side where the concave lines 18 are not formed, , the contour of the concave line 18 can be grasped. Therefore, the contour of the concave line 18 can be more clearly recognized not only from the first surface 11 but also from the second surface 12, in combination with the contrast due to the difference in color density between the high-density region 52 and the low-density region 51. can be made

Although not shown, when the wipe sheet 10 is used, it may be folded in two with the second surface 12, which is the non-wiping surface, facing inward. In such a mode of use, the second surfaces 12 of the folded portions may come into contact with each other, and the contact portions may shift during the wiping operation, resulting in insufficient force acting on the wiping surface. . In the wipe sheet 10, the protruding portion 54 of the high-density region 52 located on the second surface 12 side is hooked on the opposing surface and functions as a stopper that prevents the sliding of the folded portion, thereby preventing such sliding during the wiping operation. Wiping can be performed by suppressing displacement of the sheets and sufficiently transmitting force to the wiping surface.

In this embodiment, one wipe sheet 10 has a plurality of pattern portions 41 and 42 having independent and closed outlines 41A and 42A. It suffices if one pattern portion 41, 42 exists. In addition, since each wipe sheet 10 has a pattern area 40 with a different design, when the user takes out a plurality of wipe sheets 10 from a container in which the wipe sheets 10 are stored, wipe sheets with different designs are drawn out one after another. Therefore, the user can enjoy the pop-up.

<Method for manufacturing wipe sheet>
The wipes sheet 10 according to the present invention is produced by the same production equipment as the fibrous nonwoven fabric sheets for wipes that are commonly used in this type of field, for example, a fibrous web forming section, a water supplying section for soaking the fibrous web with water, and a fiber A manufacturing apparatus can be used that includes a water jet section (process), a dewatering section (dehydrator), and a drying section (dryer) for entangling and rearranging. The apparatus for manufacturing the wipe sheet 10 and part of the manufacturing process will be described below.

First, as the base material of the wipe sheet 10, a fiber web is formed by laminating fiber aggregates manufactured by various known manufacturing methods. The fiber web is, for example, a fiber assembly formed by a card method, a fiber assembly formed by an airlaid method, a fiber assembly formed by a wet method, a fiber assembly formed by a spunbond method, a meltblown method, or the like. can be formed by laminating. In this embodiment, the fiber web serves as the base material of the intermediate fiber layer 23 between the fiber aggregates formed by the carding method, which serves as the base material of the first and second fiber layers 21 and 22 of the wipe sheet 10. It has a multi-layer structure in which fiber aggregates formed by the air-laid method are interposed and laminated.

The fiber web is preferably pre-wet prior to the water jet process for shaping the recessed portions corresponding to the recessed lines 18 forming the fiber entanglement and patterned areas 40 . By impregnating the fiber web with water before the fibers are entangled in the jetting process, the interstices between the fibers are filled with water, increasing the fiber density. As a result, in the water jetting process, it is possible to prevent the fibers from being scattered by the water stream, making the fiber density of the fibrous web uneven, and disturbing the texture of the fibrous web. In the case of pre-impregnating the fibers with water in this way, since the purpose is to fill the interstices between the fibers with water, water may be sprayed without requiring water pressure to move the fibers.

FIG. 5 is a perspective view of a water jetting process 100 for forming recessed portions 122 corresponding to the recessed lines 18 of the design area 40 in the fiber web 101. As shown in FIG. The water spraying process 100 includes a suction drum 106 that holds the fiber web conveyed in the machine direction MD on its outer peripheral surface, and a nozzle plate 107 that sprays water to the fiber web positioned 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.

The suction drum 106 comprises a shaping support 106a having linear projections 120. As shown in FIG. The outer peripheral surface of the shaping support 106a has a mesh shape with a plurality of suction tubes 121. While the shaping support 106a is rotated around the axis K1, the fiber web 101 is sucked onto the shaping support 106a and the outer periphery is While being held on the surface, it is conveyed to a dehydrator (not shown) via downstream conveying means (not shown). The nozzle plate 107 jets water toward the first surface 101a of the fiber web 101 held on the outer peripheral surface of the suction drum 106 to entangle the fibers and is positioned on the outer peripheral surface of the shaping support 106a. By pressing against the linear projections 120, the second surface 101b side of the fiber web 101 is provided with an uneven pattern. The linear protrusions 120 are formed integrally with or separately from the outer peripheral surface of the shaping support 106a.

Although not shown, the fiber web 101 further transported in the machine direction MD by the transport belt of the dehydrator is transported to a dryer when used as a wipe sheet for use in a dry state, while it is transported to a dryer in a wet state. When used as the wipe sheet 10 used in , it is conveyed to a liquid supply means for impregnating with a liquid containing a drug or fragrance, with or without passing through a dryer. After passing through these processes, the fiber web is cut to a suitable size by a cutting means. In the dryer, part of the heat-fusible fibers forming the fibrous web 101 are heat-sealed to improve the sheet strength.

In the nozzle plate 107 , a plurality of nozzles aligned in the cross direction CD jet water onto the first surface 101 a of the fiber web 101 held on the outer peripheral surface of the shaping support 106 a of the suction drum 106 . The fiber web 101 is preliminarily entangled in a suction drum (not shown) located upstream of the suction drum 106 so that the fibers are entangled with each other with a weak force and flat as a whole. The fiber web 101 is pressed against the linear projections 120 located on the outer peripheral surface of the shaping support 106a by the water flow jetted from the nozzle plate 107 while being sucked from the tube 121. As shown in FIG.

FIG. 6(a) is an enlarged view of the fiber web 101 on the linear protrusions 120 before the water stream is jetted on the suction drum 106, and FIG. 6(b) is a line after the water stream is jetted on the suction drum. FIG. 4 is an enlarged view of the fiber web 101 on the convex portion 120;

Referring to FIGS. 5 and 6(a) and (b), since the fibers are not sucked from the linear projections 120, the fibers located on the linear projections 120 move to the periphery. On the side of the second surface 101b of the fiber web 101 corresponding to the linear projections 120 rearranged in two, concave portions 122 that are concave toward the side of the first surface 101a are formed.

The linear projections 120 have first, second and third linear projections 120a, 120b, 120a, 120b, 120a, 120b, 120a, 120b, 120a, 120b, 120a, 120b, 120a, 120b, 120b, 120b, 120b, 120b, 120b, 120b, 120b, 120b, 120b, 120b, 120b, 120b, 120b, 120b, 120b, 120 from each from each other. 120c. Since the linear projections 120 are portions protruding from the outer peripheral surface of the shaping support 106a, they are shaped into the fiber web 101 by adopting various designs such as characters and company logos in addition to the illustrated embodiment. be able to.

The linear protrusions 120 are arranged around the entire outer periphery of the shaped support 106a such that every wipes sheet 10 produced will also have at least one pattern having an independent and closed design. have a pattern. Moreover, the height of the linear protrusions 120 is designed so that the line width and height change in the extending direction according to the design to be shaped.

In the thin portion (bottom portion of the concave portion 122) 124 of the fiber web 101 located on the linear convex portion 120, 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, in the first portion 131 located at the outer periphery so as to surround the thin portion 124, the fibers moved from above the linear convex portion 120 are accumulated and the fiber density is relatively high. A second portion 132 extending further outward from the first portion 131 has a higher fiber density than the thin portion 124 and a lower fiber density than the first portion 131 .

In addition, the pulp fibers located in the intermediate fiber layer of the fiber web 101 have a shorter fiber length than the heat-fusible fibers located in the upper and lower layers, and the fibers are weakly entangled in the fiber assembly, so that they are moved by the water flow. It's getting easier. Therefore, in the low-density region consisting of the thin portion 124 located on the linear projection 120, the pulp fibers move to the periphery so that the mass of the pulp fibers is reduced compared to the first and second portions 131 and 132. is getting lower.

The design pattern formed by the entanglement of the fibers can be formed on the fiber web 101 by the water jetting process, and the concave portion 122, the first portion 131 and the second portion 132 of the fiber web 101 are wiped. Corresponds to concave line 18 (low density area 51 ), high density area 52 and medium density area 53 of sheet 10 .

Conventionally, in the manufacturing process of a spunlace fiber nonwoven fabric, there is a method of forming a concave pattern by pushing fibers into concave portions formed on a forming support of a suction drum. In such a manufacturing method, since the fibers are sucked in the recessed portions, either there are no fibers or large pores extending in the extending direction of the recessed portions are formed. Therefore, for example, when the concave portion is formed in an independent and closed shape in order to impart an independent and closed pattern to the fiber web, such as the pattern area 40 according to the present embodiment, the concave portion extends to the concave portion. A continuous hole is formed in the direction, and there is a risk that the portion surrounded by the recessed portion may fall off during the manufacturing process.

According to this manufacturing method, the fibers are reoriented by the linear projections 120 arranged on the outer peripheral surface of the shaping support 106a of the suction drum 106, and the concave portions 122 are formed on the second surface 101b side of the fiber web 101. Therefore, the thin portion 124 located on the linear protrusion 120 does not have a relatively large opening formed in its extending direction, and is surrounded by the linear protrusion 120 during the manufacturing process. No parts fall out. By shaping the fiber web 101 with the linear protrusions 120 that protrude toward the water flow in this way, various independent and closed designs such as characters, letters, figures, and symbols can be produced only by entangling the fibers. , combinations thereof, etc., can be employed in various sizes.

As an example of the manufacturing method of the wipe sheet 10, the spunlace manufacturing method by hydroentangling was exemplified, but as long as the concave lines 18 can be formed by fiber entangling by fluid treatment, air, water vapor, etc. can be used in addition to water. A manufacturing method using a fluid can also be adopted.

<Modification>
FIG. 7 is a plan view of the wipe sheet 10 similar to FIG. 2 in an example of another modification. In this modification, each concave line 18 forming the pattern area 40 has a plurality of slits 70 in its extending direction. The pattern area 40 preferably extends continuously in the extending direction from the viewpoint of design and wiping properties, but may extend discontinuously with a plurality of slits 70 arranged in this way. In such a case, the discontinuous shape of the recessed lines 18 forming the pattern area 40 improves the sheet strength because the overall area is reduced compared to if it had a continuous shape. sell.

FIG. 8 is a plan view of the wipe sheet 10 similar to FIG. 2 in yet another modified example. In this modification, a portion of the first pattern portion 41 and a portion of the second pattern portion 42 are positioned so as to overlap each other in plan view. In this manner, the portion where the first pattern portion 41 and the second pattern portion 42 overlap each other is formed, so that the proportion of the concave lines 18 per unit area of the wipe sheet 10 in the overlapping portion is large. Wiping efficiency can be improved by becoming.

In this specification, the technical effects of the wipe sheet 10 have been mainly described, but the fiber nonwoven fabric sheet according to the present invention is not limited to wipes, but is also used for sanitary purposes such as sanitary napkins, disposable diapers, and breast milk pads. It can also be used as a component material for articles. In particular, the lines forming the first and second pattern portions 41 and 42 of the pattern area 40 are excellent in design because the width dimension changes in the direction in which they extend, and they are comfortable to the touch, so they are hygienic. It can be suitably used as a sheet material in contact with the skin among products.

In addition to the materials described herein, various known materials that are commonly used in this type of field are used for each constituent member constituting the wipe sheet 10, unless otherwise specified. Can be used without restrictions. Also, the terms "first", "second" and "third" used in the specification and claims are merely used to distinguish similar elements, locations and the like.

10 Fiber non-woven fabric sheet (wipes sheet)
11 First surface 12 Second surface 18 Concave line 40 Pattern area 41 First pattern portion 42 Second pattern portion 41A, 42A Outline lines 41B, 42B Pattern 61 Wide portion 62 Narrow portion 70 Slit P First virtual line Q Second Virtual line X First direction Y Second direction Z Thickness direction

Claims (9)

A fibrous nonwoven fabric sheet having a thickness direction and a first surface and a second surface facing each other in the thickness direction and formed by hydroentangling fibers,
A pattern portion is arranged on the first surface,
The pattern portion has an independent outline,
The line forming the design portion has a width dimension varying in its extending direction ,
The design part further has a design surrounded by the contour line, and the contour line is wider than the line forming the design surrounded by the contour line. fiber nonwoven sheet. 2. The fibrous nonwoven fabric sheet according to claim 1, wherein a design element having a high priority to be particularly emphasized among the design elements constituting the pattern is formed with a wider line than other design elements. 3. The line according to claim 1 or 2 , wherein the line forming the pattern portion is a concave line that is concave toward the second surface on the first surface, and the concave line is formed by entangling fibers. fiber nonwoven sheet. The line forming the design portion has a narrow portion and a wide portion wider than the narrow portion, and the width of the wide portion is the same as the width of the narrow portion. The fibrous nonwoven fabric sheet according to any one of claims 1 to 3, which is at least 1.1 to 5.0 times. The fibrous nonwoven fabric sheet according to any one of claims 1 to 4 , wherein the outline is closed and positioned apart from the outer peripheral edge of the fibrous nonwoven fabric sheet. 4. The fibrous nonwoven fabric sheet according to claim 3 , which is made of a spunlace fibrous nonwoven fabric, and wherein the concave lines are bottomed. The fibrous nonwoven fabric sheet according to claim 3 or 6 , wherein the fiber density of the concave lines is lower than the fiber density of areas other than the concave lines. The fibrous nonwoven fabric sheet according to any one of claims 1 to 7 , wherein the lines forming the pattern portion have a plurality of slits. The fibrous nonwoven fabric sheet according to any one of claims 1 to 8 , which is a wipe sheet used in a dry state or a wet state.

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