JP4799033B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper.

DESCRIPTION OF RELATED ART Conventionally, the disposable diaper which comprises an absorber, has a fastening tape in the both sides of the one end part of a longitudinal direction, and has a landing tape which fastens this fastening tape to the other end part of a longitudinal direction is known widely. As a fastening tape in such a disposable diaper, a hook material comprising a base sheet and a number of engaging protrusions standing from the surface of the base sheet is used as a tape base because it can be detachably fixed and can be easily detached. What is joined to the material is known.
However, the conventional fastening tape has a problem that a sufficient engagement force cannot be obtained under a situation where no shear force is applied between the hook material and the loop material constituting the landing tape.
As a technique related to the engagement between the hook material and the loop material, Patent Document 1 describes a technique of forming a portion that is not joined to the tape base material at the end portion on the tape front end side in the hook material of the fastening tape. Patent Document 2 describes a technique for forming a portion of a hook material of a fastening tape that is not joined to a tape base material at an end portion on the tape base end side. Furthermore, the technique which joins the both sides of a diaper intermittently is known.

Japanese Patent No. 3215314 JP 2002-65730 A

  However, even in the technique described in Patent Document 1 or 2, there is a case where sufficient engagement force is not expressed depending on the direction of peeling when the hook material is peeled from the loop material.

  Accordingly, an object of the present invention is to provide a disposable diaper in which a good engagement force of the hook material with respect to the loop material is expressed regardless of the direction of peeling when the hook material is peeled from the loop material.

  The present invention is a disposable diaper in which a hook material comprising a base sheet and a plurality of engaging projections standing from the surface of the base sheet is fixed on another sheet material, and the diaper width direction At both ends or one end of the hook material, joint portions where the base sheet is joined onto the other sheet material and non-joint portions where the base sheet is not joined to the other sheet material are alternately arranged in the vertical direction of the diaper. The base sheet in the region has a portion spaced from the other sheet material between the adjacent joints, and between the adjacent joints, The object is achieved by providing a disposable diaper having a curved cross-sectional shape that is convex in a direction away from another sheet material.

  According to the disposable diaper of the present invention, a good engagement force of the hook material with respect to the loop material is expressed regardless of the direction of peeling when the hook material is peeled from the loop material.

Hereinafter, the present invention will be described in detail based on a preferred embodiment thereof.
As shown in FIG. 1, a disposable diaper 1 (hereinafter referred to as diaper 1) as an embodiment of the present invention includes an abdominal side A located on the abdomen side of the wearer when worn and a dorsal side part located on the back side. B, and a main body 5 having a crotch portion C disposed between the abdominal side and the back side, and a pair of left and right fastening tapes 6 and 6 connected to the left and right sides of the back side B It is a so-called unfolded diaper. On the outer surface of the ventral side A, there is a landing tape 9 for fastening the fastening tape 6. In addition, the disposable diaper 1 has a long shape in the same direction as the main body 5 in a state where the disposable diaper 1 is flattened as shown in FIG. 1, and the back side portion B constitutes one end portion of the diaper in the longitudinal direction. And the abdominal side part A comprises the other end part of the longitudinal direction of a diaper.

The main body 5 has a structure having a liquid-permeable top sheet 2, a liquid-impermeable or water-repellent back sheet 3 and a liquid-retaining absorbent 4 interposed between these two sheets, Further, the three-dimensional guard forming sheets 7 are provided.
The three-dimensional guard forming sheet 7 has an area with a predetermined width on both ends in the longitudinal direction of the main body (also in the longitudinal direction of the diaper 1) and on the outer side in the width direction of the main body (also in the width direction of the diaper 1). It is fixed to the sheet 2 and / or the back sheet 3. The three-dimensional guard forming sheet 7 has an elastic member 71 for forming a three-dimensional guard in the vicinity of the edge of the main body 5 in the lateral direction (the X direction in FIG. 2), and when worn, the elastic member Due to the contraction force, a portion having a predetermined width from the edge is separated from the topsheet 2 to form a three-dimensional guard. As shown in FIG. 1, the main body 5 has recessed portions on both sides of the longitudinal center portion, and the width is wider at both longitudinal end portions than at the longitudinal center portion.

As shown in FIGS. 2 to 4, each fastening tape 6 in the present diaper 1 includes a tape base material (sheet material) 62 and a hook material 63 fixed to one surface of the tape base material 62. The hook material 63 forms a fastening portion 61 of the fastening tape 6.
The tape base material 62 extends from a portion (not shown) fixed between the sheets constituting the main body 5 and the side edge B1 of the back side portion B of the main body 5 to constitute a part of the fastening tape 6. And have a part.

As shown in FIGS. 2 to 4, the hook member 63 includes a sheet-like base sheet 64 and a plurality of engaging protrusions 65, 65... Standing from the surface of the base sheet 64.
As such a hook material 63, for example, a hook-shaped member or a member having a hook-shaped engagement protrusion can be used. As the hook material 63, a known male member of a mechanical surface fastener can be used. For example, “Magic tape (registered trademark)” (manufactured by Kuraray), “Quicklon (registered trademark)” (manufactured by YKK), A male member or the like in “Majikurosu (registered trademark)” (manufactured by Kanebo Bell Touch) or the like can be used.
The landing tape 9 is made of a loop material having a surface structure that can be engaged with an engagement protrusion of the hook material, and as such a loop material, the hook material can be fixed by pressing the hook material. Can be used without particular limitation. As a loop material, the female member of a well-known mechanical surface fastener can be used, For example, the female member in the various well-known mechanical surface fastener mentioned above can be used. Further, by forming the outer surface of the ventral portion A from a material that can directly engage the engaging projections of the hook material, for example, a non-woven fabric that is rich in engaging properties, this can also be used as a loop material.

As shown in FIGS. 2 and 4, the hook material 63 in the present diaper 1 has a base sheet 64 attached to a tape base via an adhesive 66 in a central region M in the diaper width direction (X direction in FIG. 2). The material (sheet material) 62 is bonded. On the other hand, at both ends of the hook material 63 in the diaper width direction (X direction in FIG. 2), as shown in FIG. 3, a joint portion 67 in which a base sheet 64 is bonded onto a tape base material (sheet material) 62. And the intermittent joining area | region S where the non-joining part 68 to which this base sheet 64 is not adhere | attached on the tape base material (sheet material) 62 is alternately arrange | positioned in the diaper vertical direction (direction orthogonal to a diaper width direction). Is formed.
And in the intermittent joining area | region S, as shown in FIG. 3, the base sheet 64 has the part spaced apart from the sheet | seat material 68 between the junction parts 67 and 67 mutually adjacent in the diaper vertical direction, and a diaper Between the joint portions 67 and 67 adjacent to each other in the vertical direction, the cross-sectional shape is curved. As shown in FIG. 3, the curved cross-sectional shape means that the cross-section is curved in the cross section along the longitudinal direction of the diaper, and the curved direction is a direction that is convex toward the direction away from the sheet material 62. is there.

  In this way, the hook material 63 has the intermittent joining region S at both ends in the diaper width direction (whichever is the same), and the base sheet 64 is between the adjacent joining portions 67 and 67 in the region S. When a curved portion is formed apart from the material (sheet material) 62, engagement protrusions inclined in various directions are generated on the surface of the hook material 63 as shown in FIG. For example, the engagement protrusion 65 in the region D in FIG. 6 is inclined obliquely upward with respect to the substantially flat tape base material 62, and the engagement protrusion 65 in the region E is relative to the tape base material 62. The engagement protrusion 65 in the region F is inclined obliquely downward with respect to the tape base material 62.

  According to the diaper 1 of the present embodiment, since the engagement protrusions 65 are inclined in various directions as described above, the engagement protrusion 65 can be obtained by simply stacking the fastening tape 6 on the landing tape 9 when the disposable diaper is mounted. Engages with the loop member 91. Therefore, an operation that applies a shearing force between the hook material 63 and the loop material 91, for example, an operation that overlaps the fastening tape 6 on the landing tape 9 and pulls the fastening tape 6 in the diaper width direction is not performed. Also, a good engagement force can be obtained. In addition, since the engagement protrusions 65 are inclined in various directions, even when a force such as peeling off the hook material 63 from the loop material 91 is applied during the wearing of the disposable diaper, regardless of the direction in which the peeling force is applied. A good engagement force of the hook material 63 with respect to the loop material 91 is obtained. Therefore, the fastening tape 6 is prevented from being unintentionally detached from the landing tape 9 during wearing of the disposable diaper.

A distance L1 between the joint portions 67 and 67 adjacent to each other in the vertical direction of the diaper is formed from the viewpoint of forming the engaging protrusion 65 inclined in various directions and improving the stability of the engaging force between the hook material and the loop material (FIG. 3). Is preferably 2 to 15 mm, particularly 2 to 10 mm.
From the same point of view, the maximum separation distance L2 (see FIG. 3) between the base sheet 64 and the tape base material 62 between the adjacent joints 67, 67 is 0.1 to 2 mm, particularly 0. It is preferable that it is 1-1 mm.

In the present embodiment, as shown in FIG. 4, at both ends of the hook material 63 in the diaper width direction, the hook material 63 and the tape base material 62 are not bonded to each other by an adhesive and are not bonded to each other. As shown in FIG. 2, the cross-sectional shape as shown in FIGS. 2 and 3 is realized by intermittently forming a plurality of joints 67 in the diaper longitudinal direction.
The method for forming the joint 67 is not particularly limited, and an ultrasonic sealing method, a heat sealing method, or the like can be used. As shown in FIG. A receiving roll 81 having a convex portion 82 having a shape corresponding to the joining portion 67 in the intermittent joining region is arranged on the hook material side 63, and the horn portion 8 that oscillates the ultrasonic wave of the ultrasonic sealing machine from the tape base material 62 side. It is preferable to press and seal with ultrasonic waves from the viewpoint that the above-described curved cross-sectional shape can be efficiently formed. The receiving roll 81 shown in FIG. 5 has a gear-like shape in which convex portions 82 having a shape corresponding to the joint portion 67 in the intermittent joining region and concave portions 83 corresponding to the non-joining portion 68 are alternately arranged in the circumferential direction. is doing.
In the state where nothing is interposed between the horn portion 8 and the receiving roll 81, the distance between the two is set to 0 mm, and a polymer of the hook material 63 and the tape base material 62 is introduced between them. When the ultrasonic pressure sealing was performed with the horn portion pressing pressure of 0.16 MPa and the ultrasonic output voltage of 70 V, the above-described curved cross-sectional shape could be formed efficiently.
Moreover, it is preferable that a base sheet consists of thermoplastic resins, such as polyethylene and a polypropylene, from the viewpoint of forming the curved cross-sectional shape mentioned above efficiently and maintaining the cross-sectional shape stably.

As shown in FIG. 2, the joint portion 67 has a shape that is long in one direction, and the longitudinal direction thereof is inclined so as to form a predetermined angle with respect to the diaper width direction. However, it is preferable because the engagement protrusion 65 inclined at various angles can be formed, and the engagement stability between the hook material and the loop material can be improved.
In addition, as shown in FIG. 4, the end edge of the hook material 63 in the diaper width direction has a portion spaced from the tape base material 62, so that the engagement stability between the hook material and the loop material is improved. To preferred.

In the diaper 1 of the present embodiment, the engagement protrusion 65 of the hook member 63 has a shape that is long in one direction FL in a plan view of the hook member 63 as shown in FIG. The one direction FL of the engagement protrusion 65 is oriented in the diaper width direction.
More specifically, as shown in FIG. 7, the hook member 63 has a hook-shaped engagement protrusion 65 having an umbrella portion 65a that is long in one direction (more specifically, substantially elliptical). A large number of the umbrella portions 65a protrude from the shaft portion 65b at both end portions in the longitudinal direction FL, while the umbrella portions 65a project relatively small on both sides in the longitudinal direction FL. .

When the hook member 63 has the engagement protrusion 65 having a shape long in one direction as described above and is oriented in the width direction of the diaper, the engagement protrusion 65 is inclined in various directions. Together, the engagement stability between the hook material and the loop material is further improved.
The hook material 63 having the engagement protrusion 65 that is long in one direction is conventionally known, and as such a hook material, a conventionally known material can be used without particular limitation. The engaging protrusion 65 may be manufactured separately from the base sheet 64 and fixed to the base sheet 64 by heat fusion, adhesive, or the like, or may be integrally formed with the base sheet 64. May be.

  The forming material of each part in the diaper 1 will be described. As the forming material of the top sheet 2, the back sheet 3, the absorber 4, and the three-dimensional guard forming sheet 7, various known materials used as materials in conventional disposable diapers, respectively. These materials can be used without particular limitation. For example, as the top sheet 2, various liquid-permeable sheet materials such as a nonwoven fabric and a perforated film can be used, and as the back sheet 3, a resin film that does not have moisture permeability, fine pores, A wet resin film, a non-woven fabric such as a water-repellent non-woven fabric, a laminate of these and other sheets, and the like can be used. As the absorbent body 4, a fiber assembly made of hydrophilic fibers such as defibrated pulp or the like A material in which a superabsorbent polymer is held can be used.

  As a forming material of the tape base material 65, a synthetic resin such as polyethylene, polypropylene, polyethylene terephthalate, etc., and a sheet or nonwoven fabric made of a composite material of two or more of these synthetic resins can be used, and in particular, a sheet made of polypropylene. It is preferable to use a sheet or a nonwoven fabric made of a composite material of polypropylene and polyethylene terephthalate, from the point that the joint 67 can be easily formed with the hook material 63 by ultrasonic sealing or heat sealing.

As mentioned above, although preferable embodiment of this invention was described, this invention is not restrict | limited to embodiment mentioned above, A various change is possible in the range which does not deviate from the meaning of this invention.
For example, in the diaper 1 described above, the intermittent joint region S is formed at both ends of the hook material 63 in the diaper width direction, but the intermittent joint region S having the above-described configuration is formed only at one end. You can also.

  The planar view shape and arrangement of the joining portion 67 in the intermittent joining region S are separated from the sheet material, and various other shapes that can form a cross-sectional shape that is convexly curved in the direction away from the sheet material between the joining portions and As shown in FIG. 8, instead of a method (see FIG. 2) in which short linear objects are separated from each other in the vertical direction of the diaper and arranged in parallel as in the diaper 1 described above. A linear joint 67 ′ bent in a zigzag manner may be formed, or as shown in FIG. 9, a circular joint 67 ″ may be intermittently formed in the diaper longitudinal direction. When the portions 67 are intermittently arranged, the shape of each joint portion 67 may be an arbitrary shape such as an ellipse or a rhombus.

Moreover, the disposable diaper of this invention may be a waistband type diaper as shown in FIG. 10, and may be a disposable diaper as shown in FIG.
In the waistband type diaper 1A shown in FIG. 10, a pair of waistbands 10, 10 are provided on the left and right sides of the back side, and the back side of the diaper is attached to the wearer's back when wearing the diaper. The hook material 63A provided on one waistband 10 and the to-be-attached portion 9 ′ made of a loop material provided on the outer surface of the other waistband 10 are turned from the back side to the ventral side, After the hook material 63A is fixed to the to-be-attached portion 9 ', the other hook materials 63B and 63B provided on the inner surface of the abdominal side are fixed to the mutually connected waistband 10. Also in such a diaper 1A, the engagement stability of each hook material can be improved by providing the hook material 63A and / or the hook material 63B similarly to the hook material 63 of the diaper 1 described above.

A pant-type diaper 1B shown in FIG. 11 is a pant-type diaper that can be attached and detached while still in the form of a pant. . Also in this diaper 1B, the hook material 63C is provided in the same manner as the hook material 63 of the diaper 1 described above, whereby the engagement stability of the hook material 63C can be improved.
The shape of the hook member in plan view can also be an arbitrary shape such as a rectangle, a square, an ellipse, or a circle.

  Further, as "other sheet material" to which the hook material is fixed, in addition to the tape base material of the fastening tape, a sheet material constituting a waist band of a waist band type diaper such as the diaper 1A shown in FIG. Or the sheet | seat material which forms the inner surface of the both sides of the back side part (part mainly distribute | arranged to the back side at the time of wear) in underpants type diapers like the diaper 1B shown in FIG. Furthermore, the hook material is a sheet material constituting the non-skin contact surface of the side flap portion in the ventral side portion of the deployable disposable diaper, such as the hook material 63D of the diaper 1C shown in FIG. 12, or the diaper shown in FIG. Like 1D hook material 63E, you may be fixed to the sheet | seat material which comprises the skin contact surface of the side flap part in the back side part of a deployment type disposable diaper.

  In the present invention, the “other sheet material” to which the hook material is fixed preferably has a size and shape that allows the entire hook material to be laminated from the viewpoint of ease of detachment operation, etc. It is preferable to have a shape that becomes a tab region in a region other than the layer of the hook material (which can be easily attached and detached by pinching the portion with a finger for operation).

It is a partially broken top view which shows the state which expanded the disposable diaper as one Embodiment of this invention in planar shape. It is a schematic diagram which expands and shows the fastening tape of the diaper shown in FIG. 1, and its vicinity. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is a schematic diagram which shows the preferable joining method of a hook material and another sheet | seat. It is a figure which shows the state which engaged the loop material with the hook material, and is sectional drawing which shows the cross section of the same direction as FIG. 3 of a fastening tape. It is a figure which expands and shows a part of hook material used for the diaper shown in FIG. 1, (a) is a partially expanded schematic plan view of a hook material, (b) is the engagement protrusion of a hook material, and the longitudinal direction It is a schematic diagram which shows the state seen from the direction orthogonal to a direction. It is the schematic which shows the hook material in other embodiment of this invention, and its vicinity. It is the schematic which shows the hook material in other embodiment of this invention, and its vicinity. It is a perspective view which shows the disposable diaper as other embodiment of this invention. It is a perspective view which shows the disposable diaper as other embodiment of this invention. It is a perspective view which shows the disposable diaper as other embodiment of this invention. It is a perspective view which shows the disposable diaper as other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Back sheet 4 Absorber 6 Fastening tape 62 Tape base material (other sheet materials)
63 Hook material 65 Engagement protrusion 67 Joining portion 68 Non-joining portion S Intermittent joining region M Center region (region where base sheet is joined to other sheet material with adhesive)
FL Longitudinal direction of engaging protrusion

Claims (3)

A hook material comprising a base sheet and a number of engaging protrusions standing from the surface of the base sheet is a disposable diaper provided fixed on another sheet material,
The hook material is in the central region of the diaper width direction, the base sheet is bonded onto the other sheet member, on both ends of the hook material in the diaper width direction, the base sheet of said other junction with said base sheet joined onto the sheet material has and the non-bonding portion which is not joined to the said other sheet is formed intermittently bonded regions arranged alternately in the diaper longitudinal direction, the intermittent bonding The base sheet in the region has a portion spaced apart from the other sheet material between joint portions adjacent to each other, and the joint portions adjacent to each other are convex in a direction away from the other sheet material. A disposable diaper having a curved cross-sectional shape.   The disposable diaper has a fastening tape at one end in the longitudinal direction, a landing tape at the other end in the longitudinal direction, and the other sheet material is a tape base material of the fastening tape. The disposable diaper according to 1.   The disposable diaper according to claim 1 or 2, wherein the engagement protrusion has a shape that is long in one direction in a plan view of the hook material, and the one direction of the engagement protrusion is oriented in a diaper width direction.

Images