TW201402090A - Disposable diaper and hook sheet - Google Patents

Abstract

A fastening tape (100) provided to this disposable diaper (10) has a substrate sheet (120) and a hook sheet (110) affixed to the substrate sheet (120). The hook sheet (110) has: a base sheet section (115); a plurality of engagement hooks (111) that stand at the obverse surface of the base sheet section (115); and a plurality of anchors (112) protruding from the reverse surface of the base sheet section (115) to the substrate sheet (120). At least a portion of the anchors (112) are formed at a position overlapping the engagement hooks (111) in a plan view of the fastening tape (100).

Description

Disposable disposable diapers and hook sheets

The present invention relates to a disposable disposable diaper and a hook sheet which are provided with a buckle at one of a front waistline portion or a back waistline portion.

Conventionally, as a disposable disposable diaper which is mainly used for a baby or the like, a so-called open-type disposable disposable diaper which is provided with a buckle for fixing a side panel of a rear waist portion is provided. The structure of the buckle of the disposable disposable diaper is generally provided with a hook sheet provided with a plurality of engaging hooks, and a base sheet formed by the non-woven fabric.

Further, in order to bond the hook sheets to the base sheet, heat sealing is widely used in order to reliably join the sheets (for example, Patent Document 1).

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Japanese Laid-Open Patent Publication No. 2001-57993 (page 4, Figs. 1, 2)

However, the conventional disposable disposable diaper described above has the following problems. That is, the joint portion of the heat-sealed hook sheet and the substrate sheet becomes harder than the other portions of the disposable paper diaper, and the buckle having the hard portion may be discarded when worn. In the case of a paper diaper, there may be a problem that the user is given an uncomfortable feeling.

In particular, mothers after production are well aware of the strong discomfort and disgust of hard objects and sharp objects. For example, in a disposable disposable diaper having a belt type with a buckle, it has been observed that in a disposable diaper change, a total of 8 times or more of the buckle will be touched, so that the buckle will not feel when replaced. comfortability.

Moreover, in the recent disposable disposable diaper, the hardness of the buckle portion is more conspicuous by the improvement of the tactile sensation of the non-woven fabric constituting the disposable diaper main body.

Accordingly, the present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for providing a hook sheet and a base sheet to be reliably joined, and to reduce the discomfort when contacting the buckle. Paper diapers and hook sheets.

According to a first aspect of the present invention, a disposable disposable diaper (a disposable disposable diaper 10) is provided with a vertically long absorbent body (absorbent body 15), the absorbent body being the front a waist portion (front waist portion 20), a rear waist portion (rear waist portion 40), and a crotch portion (the lower crotch portion 30), and includes a liquid-retaining absorber (absorber 35); side flaps (side flaps 50) The side panel is provided at least a part of a side edge portion of the absorbent body in a product width direction (a product width direction D _W ); and a buckle (a buckle 100) provided on the side panel and configured One of the front waistline portion or the back waistline portion extends outward in the product width direction of the absorbent body, and is fixedly attached to the other of the front waistline portion or the rear waistline portion, wherein the buckle belt has a base sheet (base sheet 120); and a hook sheet (hook sheet 110) fixed to the base sheet, the hook sheet having a base sheet portion (base sheet portion 115); and the base sheet a plurality of snap hooks (engagement hooks 111) erected on the surface of the portion; and Inside the sheet toward the base sheet portion of the plurality of protruding holder (holder 112), at least a portion of the fixed line in a planar view of the buckle, the hook is formed at a position overlapping with the engaging.

According to a second aspect of the invention, a hook sheet is fixed to a hook sheet of a base sheet, wherein the hook sheet has a base sheet portion; and a plurality of cards erected from a surface of the base sheet portion a hook; and a plurality of protrusions from the inside of the substrate sheet portion toward the substrate sheet In the holder, at least a part of the holder is formed at a position overlapping with the engaging hook at a plane angle of view of the buckle.

According to the present invention, it is possible to provide a disposable disposable diaper and a hook sheet which can reliably engage the hook sheet with the base sheet and reduce the discomfort when contacting the buckle.

10‧‧‧Disposable disposable diapers

15‧‧‧Absorbable ontology

20‧‧‧ front waist circumference

30‧‧‧ Lower part

35‧‧‧Acceptor

40‧‧‧After waist circumference

50‧‧‧Fringe

55‧‧‧foot elastic members

60‧‧‧Target belt

70‧‧‧back sheet

100‧‧‧ buckle

110‧‧‧ hook sheet

111‧‧‧ snap hook

111a‧‧‧ pillar

111b‧‧‧ Umbrella Department

112‧‧‧fixer

115‧‧‧Substrate sheet

120‧‧‧Sheet sheet

Fig. 1 is a plan view showing a disposable disposable diaper 10 according to an embodiment of the present invention.

Fig. 2 is a partially enlarged view of the buckle 100 of the disposable disposable diaper 10 of the embodiment of the present invention.

Figure 3 is a cross-sectional view of the disposable disposable diaper 10 taken along the line F3-F3 shown in Figure 2 .

4(a) and 4(b) are an enlarged cross-sectional view and an enlarged plan view showing a buckle 100 according to an embodiment of the present invention.

Fig. 5 is a photomicrograph showing a part of the hook sheet 110 of the embodiment of the present invention.

Next, an embodiment of the disposable disposable diaper according to the present invention will be described with reference to the drawings. Furthermore, it is described in the following drawings, for the phase The same or similar parts are given the same or similar symbols. However, the figure is a schematic display, please note that the ratio of each size will be different from the real thing.

Therefore, the specific dimensions and the like should be judged by referring to the following description. Further, each of the drawings may include a difference in the relationship between the dimensions and the ratio of the dimensions.

(1) The outline shape of disposable disposable diapers

Fig. 1 is a plan view showing the disposable disposable diaper 10 of the present embodiment. As shown in Fig. 1, the disposable disposable diaper 10 has an open type of a front waistline portion 20, a crotch portion 30, and a rear waistline portion 40. The person to whom the disposable disposable diaper 10 is applied is not particularly limited, but can be preferably used, for example, in a suckling child.

The absorbent body 15 is constituted by the front waist portion 20, the crotch portion 30, and the rear waist portion 40. The absorbent body 15 has an elongated shape of the absorbent body 35 containing liquid retention. In the present embodiment, the absorber 35 is provided at a position that spans the range of the front waistline portion 20, the crotch portion 30, and the rear waist portion 40. The absorber 35 has a shape in which the width of the central portion of the absorbent body 15 in the product longitudinal direction D _L is narrowed. Further, the shape of the absorber 35 is not limited to the shape shown in Fig. 1, and may be a simple rectangle. Further, the absorber 35 may be provided at least in the crotch portion 30.

The absorbent main body 15 is the same as the conventional disposable disposable disposable diaper, and can be suitably configured using a known member or material. Further, the absorbent main body 15 may have a liquid permeable surface sheet (not shown), a three-dimensional gather provided on the side edge portion of the absorbent body 15 along the longitudinal direction D _L of the product, and a D _W along the product width direction D _W . The waist circumference of the back waist portion 40 is wrinkled and the like.

A side panel 50 is provided at a side edge portion of the absorbent body 15 in the product width direction D _W . The side panel 50 is composed of one sheet or a nonwoven fabric in which a plurality of sheets or more are stacked.

In the present embodiment, the side panel 50 is provided over the entire area of the product length direction D _L of the absorbent body 15. That is, the side panels 50 are disposed in a range from the front waistline portion 20 to the rear waistline portion 40. The width of the side panels 50 corresponding to the crotch portion 30 is narrower than the width of the side panels 50 corresponding to the front waistline portion 20 and the rear waistline portion 40. Further, the side panel 50 is not necessarily required to be provided over the entire area of the product longitudinal direction D _L of the absorbent body 15, and may be provided only in a region corresponding to the rear waistline portion 40, for example.

Further, the side edge portion of the absorbent body 15 in the product width direction D _W , specifically, the side panel 50, is provided with a leg elastic member 55 which is expandable and contractible along the longitudinal direction D _{L of} the absorbent body 15. The absorbent body 15 is contracted in the longitudinal direction D _L of the article by the foot elastic member 55. The absorbent body 15 thus contracted can be elongated toward the longitudinal direction of the article D _L particularly on the side of the rear waistline portion 40.

Further, a fastening tape 100 is attached to the pair of side panels 50. Specifically, the buckle 100 extends from the rear waist portion 40 toward the outside in the product width direction D _{W of} the absorbent body 15 . The buckle 100 is configured to be fixedly attached to the front waistline portion 20. The hook sheet 110 (not shown in FIG. 1 , see FIG. 2 ) of the buckle 100 is engaged with the target belt 60 on the side of the back sheet 70 (not shown in FIG. 1 , see FIG. 3 ) provided in the front waistline portion 20 . .

Further, the buckle 100 may be attached to the side panel 50 so as not to be attached to the rear waist portion 40 but to extend outward from the front waist portion 20 toward the product width direction D _{W of} the absorbent body 15, but in the sleep state In the case of a child who has a large disposable diaper, the buckle 100 is preferably attached to the rear waist portion 40.

(2) the shape of the buckle

Next, the shape of the buckle 100 will be described with reference to Figs. 2 to 4 . Figure 2 is a partial enlarged view of the buckle 100 of the disposable disposable diaper 10. Figure 3 is a cross-sectional view of the disposable disposable diaper 10 taken along the line F3-F3 shown in Figure 2 . 4(a) and 4(b) are an enlarged cross-sectional view and an enlarged plan view of the fastening tape 100.

As shown in FIGS. 2 to 4, the buckle 100 is attached to a region of the side panel 50 corresponding to the rear waistline portion 40 (refer to FIG. 1). The buckle 100 has a hook sheet 110 and a base sheet 120 formed by a nonwoven fabric. Further, the base sheet 120 may be used in a nonwoven fabric laminate film.

Further, the hook sheet 110 has a base sheet portion 115, a plurality of engagement hooks 111 that are erected from the surface of the base sheet portion 115, and a plurality of protrusions that protrude from the inside of the base sheet portion 115 toward the base sheet 120. Holder 112.

The hook sheet 110 is fixed to the base sheet 120. Specifically, as shown in FIGS. 4( a ) and ( b ), the holder 112 enters the substrate thin In the sheet 120, the holder 112 is engaged with the base sheet 120 formed of a non-woven fabric. As a result, the hook sheet 110 is fixed to the base sheet 120. Further, even in the case of using a hook having such a holder 112, an adhesive such as a hot melt adhesive can be used, but it is preferable to reduce the amount of the adhesive or the joint area.

The holder 112 is not provided to face all of the engaging hooks 111, but is formed at a position opposed to a part of the engaging hooks 111. Further, at least a part of the holder 112 is formed at a position overlapping with the engagement hook 111 at a plane angle of view of the buckle 100 (see FIG. 4(b)).

The engaging hook 111 has an umbrella portion 111b and a column portion 111a which is thinner than the umbrella portion 111b and located at a position close to the base sheet 120. The diameter of the column portion 111a is substantially the same as the diameter of the holder 112. In the present embodiment, the holder 112 projects the column portion 111a toward the back surface (the base sheet 120 side) of the base sheet portion 115 by the ultrasonic bonding device described later. That is, the holder 112 is constructed by deforming the column portion 111a having a slightly the same diameter.

The height of the engaging hook 111 is not particularly limited, and a general commercial item can be used.

The base sheet 120 is composed of, for example, one or two or more sheets of the superimposed sheet, specifically, a non-woven fabric or a sheet formed by laminating a non-woven fabric. As the base sheet 120, a nonwoven fabric produced by a method such as spunbond (SB), spunbond-melt-spray (SMS), hot air, or the like, and a non-woven fabric laminated with a non-woven fabric such as spunbond can be used. Sheet, etc.

In particular, the base sheet 120 may have a structure in which a plurality of sheets of two or more sheets are stacked. In this case, the basis weight per one piece of the nonwoven fabric sheet is from 10 to 80 g/m ² , preferably from 15 to 60 g/m ² , more preferably from 20 to 55 g/m ² . The thickness of the entire base sheet 120 is 150 μm to 550 μm, preferably 250 μm to 500 μm, as described above. Furthermore, the thickness of the non-woven fabric is determined by using the measurement terminal shape to be circular ( 5 mm) and a thickness gauge of 1.23 N (measured by a thickness gauge of a tester (Tester) Co., Ltd.).

Further, as shown in FIG. 4(a), the thickness H1 of the base sheet portion 115 is thinner than the height H2 of the engaging hook 111. Further, the thickness H3 of the base sheet 120 is preferably thicker than the height H2 of the engaging hook 111.

(3) Manufacturing method of buckle

In the present embodiment, the holder 112 provided on the hook sheet 110 is formed by using an ultrasonic joining device. As the ultrasonic vibration device, for example, a bonding device including an ultrasonic horn and an anvil described in Japanese Laid-Open Patent Publication No. 2004-298413 can be used.

In order to form the holder 112, the hook sheet 110 and the base sheet are used in a state where the hook sheet 110 on which the holder 112 is not formed and the base sheet 120 are held between the ultrasonic horn and the anvil. 120 gives ultrasonic vibration. Here, the ultrasonic horn is disposed on the surface (surface, FIG. 4(a) AR2 side) of the hook sheet 110 on the side where the engaging hook 111 is formed, and the anvil is disposed on the side where the engaging hook 111 is not formed. The surface of the hook sheet 110 (inside, on the AR1 side of Fig. 4(a)). Due to super The shape of the acoustic horn is, for example, elliptical. Therefore, as shown in Fig. 4(b), the region A1 where the ultrasonic horn is abutted is formed, and ultrasonic vibration is applied to the region A1. Therefore, the height of the plurality of engaging hooks 111 is different from the surface of the base sheet portion 115. Specifically, the height of the engagement hook 111 of the portion A1 from the surface of the base sheet portion 115 is lower than the height of the engagement hook 111 of the portion other than the region A1 from the surface of the base sheet portion 115.

When the hook sheet 110 (specifically, the thickness of the engaging hook 111 and the base sheet portion 115) is the thickness A and the base sheet 120 is the thickness B, the interval between the ultrasonic horn and the anvil is made larger. When the value of A+B is narrow, the column portion 111a of the engaging hook 111 protrudes toward the base sheet 120 by an amount corresponding to the interval Δ. For example, when the interval Δ is made 30 μm narrower than the value of A+B, the umbrella portion 111b that is in contact with the ultrasonic horn does not melt, and theoretically, the vicinity of the base sheet portion 115 of the column portion 111a of the engaging hook 111 vibrates. On the other hand, the amount of heat of about 30 μm is melted, whereby heat is generated from the base sheet portion 115, and the amount by which the thickness H1 of the base sheet portion 115 is subtracted is used as the holder 112 to enter the base sheet 120. Further, the fibers of the base sheet 120 are brought into contact with the column portion 111a passing through the base sheet portion 115, so that the column portion 111a and the fiber portion of the base sheet 120 are thermally fused.

(4) Effect

According to the buckle 100, since the hook sheet 110 is provided with a plurality of holders 112 protruding from the inside of the base sheet portion 115, the hook sheet 110 and the base sheet 120 can be surely used without using an adhesive or the like. Engage. Specifically, the plurality of holders 112 are entangled with the fibers of the nonwoven fabric forming the base sheet 120, and the state in which the hook sheets 110 are joined to the base sheet 120 is maintained.

Here, FIG. 5 is a micrograph showing a part of the hook sheet 110. As shown in FIG. 5, a holder 112 is formed in the area A1 where the ultrasonic horn abuts. The holder 112 is formed by being protruded from the inside of the base sheet portion 115 by melting the column portion 111a of the engaging hook 111 as described above. The portion of the slightly rounded holder 112 is ultrasonically vibrated in a state of being held by the ultrasonic horn and the anvil, whereby the column portion 111a protrudes from the inside of the substrate sheet portion 115 at the protruding column portion. 111a, that is, at the holder 112, a thin line-like mark which is entangled with the non-woven fabric forming the base sheet 120 is produced.

The bonding of the hook sheet 110 and the base sheet 120 by such ultrasonic vibration is not accompanied by melting of the base sheet 120 itself, melting of the entire hook 111, and the like, and it is not necessary to use hot melt adhesive. Since the agent or the like is used, the flexibility of the buckle 100 can be greatly improved compared to the conventional joining method. Moreover, the base sheet portion 115 is less likely to warp and return than the conventional joining method, and it is easier to maintain a flat state. Therefore, the discomfort when contacting the buckle 100 can be reduced.

Further, since the plurality of holders 112 are strongly engaged with the base sheet 120, the hook sheet 110 and the base sheet 120 can be surely joined.

In the present embodiment, the thickness H1 of the base sheet portion 115 is thinner than the height H2 of the engaging hook 111, and the thickness H3 of the base sheet 120 is It is thicker than the height H2 of the engaging hook 111. Therefore, the holder 112 can surely bite into the substrate sheet 120, and the holder 112 does not fly out of the substrate sheet 120.

In the present embodiment, as described above, since the holder 112 is formed from the column portion 111a projecting from the inside of the base sheet portion 115, the holder 112 is formed to overlap the engagement hook 111 at a plane angle of view of the buckle 100. position. Further, the diameter of the column portion 111a is substantially the same as the diameter of the holder 112. According to such a holder 112, since the holder 112 is surely formed at a position corresponding to the engagement hook 111, it is possible to easily ensure sufficient pulling stress for the engagement hook 111 engaged with the target belt 60. strength.

Further, in the present embodiment, since the engagement hook 111 has the umbrella portion 111b and the height is different from the surface of the base sheet portion 115, even after the processing for reducing the height of the engagement hook 111 is performed, the engagement hook 111 does not become large. The ground damages the engagement function of the engagement hook 111 and the engagement object.

(5) Other embodiments

The present invention has been described by way of example only, and is not intended to limit the invention. The present invention includes various alternative embodiments, examples, and operational techniques that are apparent to those skilled in the art from this disclosure.

For example, in the foregoing embodiment, a method of manufacturing the buckle 100 by forming the holder 112 using an ultrasonic vibration device has been described. However, the method is not necessarily employed, and the solid method may be used to form a solid. The selector 112. For example, the holder 112 is formed on the inner surface of the base sheet portion 115 by the same manufacturing method as the engagement hook 111.

Further, in the above-described embodiment, the hook tape 110 and the base sheet 120 are configured to constitute the buckle 100, but the hook sheet 110 may not be used as a buckle, but may be used as a flap portion of a sanitary napkin, for example. It is used for fixing components.

As such, the present invention naturally includes various embodiments not described herein. Therefore, the technical scope of the present invention is determined by the specific matters of the invention from the above description only by the scope of the invention.

110‧‧‧ hook sheet

111‧‧‧ snap hook

111a‧‧‧ pillar

111b‧‧‧ Umbrella Department

112‧‧‧fixer

115‧‧‧Substrate sheet

120‧‧‧Sheet sheet

A1‧‧‧ area

H1‧‧‧ Thickness of the substrate sheet

Height of H2‧‧‧ snap hook

H3‧‧‧ Thickness of substrate sheet

Claims (7)

A disposable disposable diaper comprising: a longitudinally long absorbent body which is composed of a front waist portion, a rear waist portion and a crotch portion and which comprises a liquid retaining body; a side flap; The side panel is provided at least a part of a side edge portion of the absorbent body in a product width direction; and a buckle provided on the side panel and configured to be one of the front waist portion or the back waist portion And extending to the outside of the product width direction of the absorbent body and fixedly attached to the other of the front waistline portion or the back waistline portion, wherein the buckle tape has a base material sheet; and is fixed to the base material sheet a hook sheet, the hook sheet having: a base sheet portion; a plurality of engaging hooks erected from a surface of the base sheet portion; and a plurality of fixings protruding from the inner surface of the base sheet portion toward the base sheet At least a part of the holder is formed at a position overlapping with the engaging hook at a plane angle of view of the buckle. A disposable diaper for use in the first aspect of the invention, wherein the thickness of the base sheet portion is thinner than the height of the engaging hook. A disposable diaper according to claim 1 or 2, wherein the thickness of the base sheet is thicker than the height of the engaging hook. Disposable after use of any of the first to third patent applications In the disposable diaper, the engaging hook has an umbrella portion; and a column portion which is thinner than the umbrella portion and located near the base sheet, and the diameter of the column portion is substantially the same as the diameter of the holder. A disposable diaper according to the fourth aspect of the invention, wherein the holder is configured by deformation of the column portion. A disposable diaper for use in the fourth aspect of the invention, wherein the plurality of engagement hooks have the umbrella portion and have a different height from a surface of the base sheet portion. A hook sheet is fixed to a hook sheet of a base sheet, wherein the hook sheet has: a base sheet portion; a plurality of snap hooks erected from a surface of the base sheet portion; and the base material A plurality of holders projecting from the inside of the sheet portion toward the base sheet, at least a portion of the holder being formed at a position overlapping the hook portion in a plane view of the hook sheet.