JP2008029640A - Fastening tape - Google Patents

Abstract

In a fastening tape comprising a base sheet and a planar mechanical fastener joined to the base sheet, it is possible to prevent poor feel caused by the seal between the mechanical fastener and the base sheet. To provide a fastening tape that does not easily peel off from a material sheet.
A fastening tape 8 comprising a base sheet 81 and a planar mechanical fastener 82 joined to the base sheet 81, disposed on a side edge in a longitudinal direction of a deployable disposable diaper, The mechanical fastener 82 has a pair of linear ends 82A that are substantially parallel, and extends continuously or intermittently along the linear ends 82A in the vicinity of the pair of linear ends 82A of the mechanical fastener 82. The pair of curved seal lines 9 are joined to the base sheet 81.
[Selection] Figure 5

Description

  The present invention relates to a fastening tape disposed on a side edge in a longitudinal direction of a deployable disposable diaper.

  In general, a pair of fastening tapes is provided on the side edge portion in the longitudinal direction of the back side portion of the unfolded disposable diaper. A fastening tape generally comprises a base sheet and a planar mechanical fastener (male material or female material) joined to one surface of the base sheet, and a non-skin contact surface on the ventral side of a disposable diaper. The wearing form of a disposable diaper can be formed now by fastening to the side. The mechanical fastener is joined to the base material sheet by, for example, heat sealing or ultrasonic sealing (see Patent Documents 1 and 2 below).

Japanese National Patent Publication No. 11-507286 JP 2005-279005 A

However, in the fastening tape described in Patent Document 1, the mechanical fastener is joined to the base sheet by a plurality of straight (line segment) seals arranged in parallel at predetermined intervals. Further, in the fastening tape described in Patent Document 2, the mechanical fastener is joined to the base sheet by a seal having a shape composed of a combination of straight lines (line segments) like a “M” or “star” pattern. ing.
Therefore, in the fastening tapes described in Patent Documents 1 and 2, the tactile sensation is poor due to the edge of the linear portion of the seal and the corner portion at the intersection of the linear portion and the linear portion. Moreover, when the force of the direction which peels from a base material sheet along the linear part of a seal | sticker is added to a mechanical fastener, a mechanical fastener will be easy to peel from a base material sheet.

  Accordingly, an object of the present invention is to prevent the poor feel caused by the seal between the mechanical fastener and the base sheet in the fastening tape comprising the base sheet and the planar mechanical fastener joined to the base sheet. An object of the present invention is to provide a fastening tape in which a mechanical fastener is hardly peeled off from a base sheet.

  The present invention is a fastening tape comprising a base sheet and a planar mechanical fastener joined to the base sheet, which is disposed on a side edge portion in the longitudinal direction of the unfolded disposable diaper, the mechanical fastener Is a pair of curved ends having a pair of substantially linear ends and extending continuously or intermittently along the linear ends in the vicinity of the pair of linear ends of the mechanical fastener. The above-mentioned object is achieved by providing a fastening tape joined to the base sheet by a seal line.

  According to the fastening tape of the present invention, in a fastening tape comprising a base sheet and a planar mechanical fastener joined to the base sheet, the poor feel caused by the seal between the mechanical fastener and the base sheet is prevented. The mechanical fastener is difficult to peel off from the base sheet.

The fastening tape of the present invention will be described below with reference to the drawings based on the first embodiment which is a preferred embodiment thereof.
The fastening tape of this invention is distribute | arranged to the side edge part of the longitudinal direction in a deployment-type disposable diaper.
First, the unfoldable disposable diaper provided with the fastening tape of the first embodiment will be described. The disposable diaper 1 of this embodiment is a diaper for infants, and as shown in FIGS. 1 to 3, the fastening tapes 8, 8 of this embodiment are arranged on both side edges in the longitudinal direction.

As shown in FIGS. 2 and 3, the disposable diaper 1 has a liquid-permeable top sheet 2, a liquid-impermeable or water-repellent back sheet 3, and a liquid-retaining absorption interposed between both sheets 2 and 3. The body 4 is provided and is formed substantially vertically long. In FIG. 3, only one side in the diaper width direction is shown, but the other side is similarly configured.
Moreover, as shown in FIG. 2, the disposable diaper 1 has an abdominal side A disposed on the abdomen side of the wearer when worn, a crotch part B disposed on the crotch part of the wearer, and the wearer. It is divided into the back side part C arranged on the back side of.

  A pair of side flaps S are formed on both sides of the ventral side A in the longitudinal direction. A pair of side flaps S are also formed on both side portions of the back side portion C in the longitudinal direction. The skin contact surface side and the non-skin contact surface side of the side flap S are formed from a sheet material 62 and an outer layer sheet 5 described later, respectively.

  As shown in FIG. 2, the disposable diaper 1 has an hourglass shape in which a central portion in the longitudinal direction is confined inward in the width direction. The top sheet 2 and the back sheet 3 respectively extend outward from the left and right side edges of the absorber 4. An outer layer sheet 5 made of a water-repellent nonwoven fabric is joined to the non-skin contact surface side surface of the back sheet 3, and the outer layer sheet 5 defines the outline of the disposable diaper 1.

  As shown in FIG. 3, the width of the top sheet 2 is smaller than the width of the back sheet 3. The left and right edges of the top sheet 2 are the left and right edges of the back sheet 3. It ends inward in the diaper width direction. Further, the back sheet 3 has a width direction dimension smaller than the width direction dimension of the outer layer sheet 5, and the left and right side edges of the back sheet 3 are wider than the left and right side edges of the outer layer sheet 5. Terminates inward.

  As shown in FIG. 2, the absorbent body 4 is vertically long, and its longitudinal direction coincides with the diaper longitudinal direction. The absorber 4 is distribute | arranged ranging from the edge part by the side of the stomach side A to the edge part by the side of the back side C. Moreover, the absorber 4 has the shape of the hourglass in which the center part of the longitudinal direction was bundled inward in the width direction. The absorbent body 4 is arranged so that a portion confined in the width direction thereof is located approximately in the crotch part B. Therefore, when the diaper is worn, the wearer's feeling of wearing in the crotch part is enhanced. .

  As shown in FIGS. 1 and 2, the disposable diaper 1 is provided with a pair of leak-proof cuffs 6 and 6 along both longitudinal sides of the absorbent body 4. Each leak-proof cuff 6 is formed by disposing a sheet material 62 made of a nonwoven fabric provided with an elastic member 61 so as to straddle both side edges of the topsheet 2 as shown in FIG. Each sheet material 62 is fixed on the top sheet 2 across the longitudinal direction of the diaper by a linear fixing portion 63 between a side edge of the absorber 4 and an elastic member 71 (described later) for forming leg gathers. ing. The linear fixing portion 63 is a fixed end of the leak-proof cuff 6.

As for each sheet material 62, the part located in the diaper width direction center side rather than fixed part 63 is being fixed to surface sheet 2, and the part located in the width direction outside rather than fixed part 63 is surface sheet 2, It is fixed to the back sheet 3, the outer layer sheet 5, and the like.
The free end (inner end) of the leak-proof cuff 6 is formed substantially parallel to the diaper longitudinal direction when the diaper is deployed. In the vicinity of the free end of the leak-proof cuff 6, a plurality of thread-like elastic members 61 and 61 for forming a three-dimensional gather are fixed in an extended state.

  As shown in FIGS. 1 and 2, the disposable diaper 1 is formed with a pair of leg flaps 7 and 7 along both side portions in the longitudinal direction of the diaper. The leg flap 7 is formed mainly of the sheet material 62 and the outer layer sheet 5 that extend outward from the back sheet 3 in the diaper width direction. In the vicinity of the free end (outer end) of the leg flap 7, a plurality of elastic members 71, 71 for forming leg gathers are fixed to the sheet material 62 in an extended state.

Next, the fastening tape 8 of this embodiment will be described in detail.
As shown in FIGS. 3 and 4, the fastening tape 8 of this embodiment includes a base sheet 81 and a planar mechanical fastener 82 joined to one surface 81 </ b> A of the base sheet 81.

  As shown in FIG. 4, the base sheet 81 is horizontally long, and its longitudinal direction coincides with the diaper width direction. As shown in FIG. 3, the base sheet 81 is sandwiched and fixed between a sheet material 62 and the outer layer sheet 5, as shown in FIG. 3. Both surfaces of the attachment portion 83 are joined to the sheet material 62 or the outer layer sheet 5 by a known joining method.

As shown in FIG. 4, the base sheet 81 has an extending portion 84 that extends outward from the side edge portion of the side flap S in the diaper width direction. The extending portion 84 has a substantially trapezoidal shape with a rounded end corner and a curved side.
A mechanical fastener 82 is joined to one surface 81A of the extending portion 84, but a fastening member such as a mechanical fastener is not provided on the other surface 81B of the base material sheet 81.

  As shown in FIG. 5, the mechanical fastener 82 has a pair of substantially linear end portions 82A and 82A. The linear end portion 82A in the present embodiment is geometrically linear.

  The mechanical fastener 82 is a base sheet by a pair of curved seal lines 9 extending continuously or intermittently along the linear end portion 82A in the vicinity of the pair of linear end portions 82A, 82A in the mechanical fastener 82. 81 is joined. “Near the linear end portion 82A” refers to an area within 10 mm from the linear end portion 82A. The curved seal line 9 only needs to be located in the vicinity of the linear end portion 82A at the portion closest to the linear end portion 82A.

  In the present embodiment, the curved seal line 9 has a substantially semicircular arc shape as shown in FIG. 5 and is arranged so that the chord of the semicircular arc substantially coincides with the linear end portion 82A of the mechanical fastener 82. The curved arc seal 91 is formed from a curved arc seal assembly formed by intermittently arranging a plurality of curved arc seals 91 along the linear end portion 82A. The semicircular chord is a line segment that connects both ends of the semicircular arc and passes through the center of the semicircular arc.

The number of curved arc seals 91 in one curved seal line 9 is preferably 1 to 6. In the present embodiment, all the curved arc seals 91 forming the curved seal line 9 have the same shape. Further, the curved seal line 9 at the linear end portion 82 </ b> A on the attachment portion 83 side is formed by three curved arc seals 91, and the curved seal at the linear end portion 82 </ b> A on the front end side of the base sheet 81. Line 9 is formed from two curved arc seals 91.
The curved seal line 9 may include a (incomplete) curved arc seal 91 that does not form a complete semicircular arc (in the present embodiment, there is an incomplete curved arc seal 91). Not) In the curved seal line 9, such an incomplete curved arc seal 91 is also counted as one.

In the present embodiment, as shown in FIG. 5, a plurality of curved arc seals 91 are arranged at an equal pitch in the curved seal line 9. The plurality of curved arc seals 91 in the vicinity of one linear end portion 82A of the mechanical fastener 82 and the plurality of curved arc seals 91 in the vicinity of the other linear end portion 82A are arranged with a half-pitch shift. is doing.
Specifically, the end of the curved arc seal 91 in the vicinity of one linear end 82A and the end of the curved arc seal 91 in the vicinity of the other linear end 82A, which are shifted by a half pitch, are thick. This amount overlaps the extending direction of the linear end portion 82A. Therefore, the projection in which the pair of curved seal lines 9 and 9 are projected in the direction orthogonal to the extending direction of the pair of linear end portions 82A and 82A is continuous in the extending direction.

  In the present embodiment, the substantially semicircular arc shape of the curved arc seal 91 is a semicircular arc shape. However, for example, a semi-elliptical arc shape or a sinusoidal half-cycle shape may be used. In the curved arc seal 91 in the shape of a semi-elliptical arc, the major axis of the semi-elliptical arc may be arranged so as to substantially coincide with the linear end 82A, and the minor axis of the semi-elliptical arc is substantially equal to the linear end 82A. You may arrange | position so that it may correspond.

  The curved seal line 9 (curved arc seal 91) is formed from, for example, a heat seal, an ultrasonic seal, a high frequency seal, or the like.

  The disposable diaper 1 of this embodiment is used for infants, and its dimensions are appropriately designed according to the specific application. For example, the length of the base material sheet 81 in the longitudinal direction is 20 to 50 mm, and the length of the extending portion 84 in the longitudinal direction is 25 to 50 mm from the viewpoint of fastening operability of the fastening tape 8. preferable.

Next, the landing tape 11 will be described. As shown in FIGS. 1 and 2, the landing tape 11 is affixed to the non-skin contact surface side surface of the outer layer sheet 5 of the abdominal side A, and is a horizontally long rectangle whose longitudinal direction is the diaper width direction. Is consistent with As shown in FIG. 6, the landing tape 11 is configured such that a wearing form of the disposable diaper can be formed by fastening the fastening tape 8.
In addition, when the surface of the disposable diaper 1 on the non-skin contact surface side is formed of a sheet that can be fixed to the male mechanical fastener 82, the landing tape 11 is not necessarily required.

Next, each member which forms the disposable diaper 1 is demonstrated.
As the top sheet 2, the back sheet 3, the outer layer sheet 5, and the absorber 4, various materials used in conventional absorbent articles and the like can be used.
As a forming material of the base material sheet 81 of the fastening tape 8, various tape materials such as a nonwoven fabric or a synthetic resin film used in a conventional disposable diaper can be used. From the viewpoint, it is preferable to use a nonwoven fabric.

  The material for forming the landing tape 11 is preferably a nonwoven fabric used as a female material for mechanical fasteners used in conventional disposable diapers or the like, or a synthetic resin film joined with a nonwoven fabric or a knitted fabric. A non-woven fabric that is a female material for the fastener is preferred.

  In the fastening tape 8 of the present embodiment configured as described above, the mechanical fastener 82 is joined to the base sheet 81 by a pair of curved seal lines 9 extending intermittently along the linear end portion 82A. ing. Therefore, the edge of the linear part of the seal and the corner part at the intersection of the linear part and the linear part do not exist on the mechanical fastener 82. Therefore, the tactile feeling of the seal is good and the texture is also excellent.

Further, since the seal line is curved, the tangent line of the seal line is directed in multiple directions, unlike the linear seal line. Even if the fastening tape 8 is repeatedly used, the mechanical fastener 82 is unlikely to peel off from the base sheet 81 in any direction because the tangent lines of the seal lines are directed in multiple directions.
Furthermore, since the shape of the engagement region in the mechanical fastener 82 (the region that substantially contributes to engagement, the region other than the curved seal line 9) is not constant, and the end of the seal line is curved, The engagement between the mechanical fastener 82 and the mechanical fastener (landing tape 11 in the present embodiment) paired with the mechanical fastener 82 is difficult to peel off due to dispersion in the stress direction.

  Next, another embodiment of the fastening tape of the present invention will be described. In the other embodiments, differences from the first embodiment described above will be mainly described, and the same points are denoted by the same reference numerals and description thereof will be omitted. For the points that are not particularly described, the description of the first embodiment is applied as appropriate. In other embodiments, the same effects as those of the first embodiment can be obtained.

  In the fastening tape 8 of the second embodiment, as shown in FIG. 7, as compared to the first embodiment, a plurality of curved arc seals 91 in the vicinity of one linear end 82 </ b> A of the mechanical fastener 82, The plurality of curved arc seals 91 in the vicinity of the other linear end portion 82A are arranged at the same pitch. About another structure, it is the same as that of 1st Embodiment.

  In the fastening tape 8 of the third embodiment, as shown in FIG. 8, the curved seal line 9 has a substantially circular circular seal 92 as compared to the first embodiment, and the linear shape of the mechanical fastener 82. It is formed of a circular seal assembly configured by intermittently arranging a plurality along the end portion 82A. As for the other configuration, a plurality of circular seals 92 in the vicinity of one linear end portion 82A and a plurality of circular seals 92 in the vicinity of the other linear end portion 82A are arranged with a half-pitch shift. It is the same as that of 1st Embodiment including the point which exists.

  In the case where the curved seal line 9 is formed from a circular seal assembly, the shape of the circular seal 92 is not limited to a perfect circular shape, and may be an elliptical shape. In the elliptical circular seal 92, the major axis may be arranged in parallel with the linear end part 82A, and the minor axis may be arranged in parallel with the linear end part 82A. The plurality of circular seals 92 in the vicinity of one linear end portion 82A and the plurality of circular seals 92 in the vicinity of the other linear end portion 82A may be arranged at the same pitch.

In the fastening tape 8 of the fourth embodiment, as shown in FIG. 9, the curved seal line 9 continuously extends along the linear end portion 82 </ b> A of the mechanical fastener 82 as compared with the first embodiment. It has a meandering shape. About another structure, it is the same as that of 1st Embodiment.
As shown in FIG. 9, the meandering shape may be a shape in which a plurality of semi-true arcs are connected to form a meandering shape, or a shape in which a plurality of semi-elliptical arcs are connected to form a meandering shape. It may be a sinusoidal shape.
As shown in FIG. 9, the meandering curved seal line 9 in the vicinity of one linear end 82A and the meandering curved seal line 9 in the vicinity of the other linear end 82A have phases as shown in FIG. They may be matched or may be shifted by half phase.

The fastening tape of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention.
For example, when the curved seal line is formed from a curved arc seal assembly or a circular seal assembly, one curved seal line may be formed from one curved arc seal or a circular seal.
A curved seal line or a curved arc seal may be provided in a region other than the vicinity of the linear end portion of the mechanical fastener.

The mechanical fastener may be a female material. In that case, for example, a male member of a mechanical fastener to be paired may be provided on the non-skin contact surface side of the abdomen side portion of the disposable diaper.
The fastening tape may be arranged on both side edges of the ventral side of the disposable diaper. The disposable diaper may be an adult diaper.
In the fastening tape of this invention, each structure of each said embodiment can be combined suitably.

FIG. 1 is a perspective view showing the unfolded disposable diaper provided with the fastening tape of the first embodiment of the present invention in its natural state. FIG. 2 is a plan view showing the disposable diaper shown in FIG. 1 in a state in which the elastic member of each part is extended and expanded in a planar shape. FIG. 3 is an enlarged sectional view taken along line XX shown in FIG. FIG. 4 is a partially enlarged plan view of the disposable diaper shown in FIG. 1. FIG. 5 is a plan view showing the fastening tape of the first embodiment. FIG. 6 is a perspective view showing a wearing form of the disposable diaper shown in FIG. 1. FIG. 7 is a plan view (corresponding to FIG. 5) showing the fastening tape of the second embodiment. FIG. 8 is a plan view (corresponding to FIG. 5) showing the fastening tape of the third embodiment. FIG. 9 is a plan view (corresponding to FIG. 5) showing the fastening tape of the fourth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Unfoldable disposable diaper 11 Landing tape 2 Top sheet 3 Back sheet 4 Absorber 5 Outer sheet 6 Leak-proof cuff 61 Elastic member for forming three-dimensional gathers 62 Sheet material 63 Fixing part 7 Leg flap 71 Elastic member for forming leg gathers 8 Fastening Tape 81 Base Sheet 81A One Side 81B Other Side 82 Mechanical Fastener 82A Linear End 83 Attachment Portion 84 Extension 9 Curved Seal Line 91 Curved Arc Seal 92 Circle Seal A Abdominal Side B Back Side C Inseam S side flap

Claims (7)

A fastening tape comprising a base sheet and a planar mechanical fastener joined to the base sheet, arranged on the side edge in the longitudinal direction of the unfolded disposable diaper,
The mechanical fastener has a pair of linear ends that are substantially parallel, and a pair that extends continuously or intermittently along the linear ends in the vicinity of the pair of linear ends of the mechanical fastener. Fastening tape joined to the base material sheet by a curved seal line.   The curved seal line has a substantially semicircular arc shape, and a curved arc seal arranged so that a string of the semicircular arc substantially coincides with the linear end portion of the mechanical fastener is attached to the linear end portion. The fastening tape according to claim 1, wherein the fastening tape is formed from a curved arc seal assembly that is intermittently arranged along one or a plurality thereof.   In the curved seal line, the plurality of curved arc seals are arranged at an equal pitch, the plurality of curved arc seals in the vicinity of one linear end of the mechanical fastener, and the other straight line The fastening tape according to claim 2, wherein the plurality of curved arc seals in the vicinity of the end portions are arranged with a half-pitch shift.   In the curved seal line, the plurality of curved arc seals are arranged at an equal pitch, the plurality of curved arc seals in the vicinity of one linear end of the mechanical fastener, and the other straight line The fastening tape according to claim 2, wherein the plurality of curved arc seals in the vicinity of the end portions are arranged with the same pitch.   The fastening tape according to any one of claims 2 to 4, wherein the substantially arcuate shape of the curved arc seal is a semicircular arc, a semi-elliptical arc, or a half-cycle shape of a sine curve.   The curved seal line is formed from a circular seal assembly formed by intermittently arranging one or a plurality of circular seals having a substantially circular shape along the linear end portion of the mechanical fastener. The fastening tape according to claim 1.   The fastening tape according to claim 1, wherein the curved seal line has a meandering shape that continuously extends along the linear end portion of the mechanical fastener.

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