JPH0423547Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Purpose of the invention [Field of industrial application] The present invention relates to disposable diapers, especially those for infants.

[Conventional technology and its problems]

Conventionally, disposable diapers have generally been provided with both side flaps that come into soft contact with the wearer's legs, and elastic members attached to each of the side flaps so as to be stretchable in the longitudinal direction. Many diapers are known in which the elastic members are partially sloped or entirely curved, and the distance between the elastic members in the rear region of the diaper is wider than that in the front region of the diaper.

However, although the elastic member in the prior art is devised in its inclined or curved form,
In comparison, the fit and adhesion of the diaper to the body is still insufficient, and in addition, the elastic member is processed at high speed in the diaper manufacturing equipment, and the diaper is not suitable for the transport direction of the diaper components in the equipment line. It is not simple enough to be easily deformed, ie, formed into an inclined or curved state, and is therefore not suitable for high-speed diaper production.

Therefore, an object of the present invention is to provide a disposable diaper that has an elastic member that has a simple form that is suitable for high-speed processing by manufacturing equipment, and that has excellent conformability to the body due to the elastic member. do.

(2) Structure of the invention [Means for solving the problems] The diaper according to the invention comprises a longitudinally elongated absorbent core, a water-permeable top sheet that covers at least the upper surface of the core, and a water-permeable top sheet that covers at least the back surface of the core. The present invention is based on a disposable diaper including a water-impermeable back sheet for covering, water-impermeable side flaps extending outward from opposite side edges of the core, and an elastic member attached to the side flaps so as to be stretchable in the longitudinal direction.

The elastic member extends in the front-rear direction of the diaper from an imaginary lateral center line that bisects the diaper into a front section and a rear section, or a region near the imaginary lateral center line, and a portion of the elastic member extending from the region to the rear direction is is inclined outwardly at an angle of 5 to 30 degrees with respect to the imaginary longitudinal centerline of.

A portion of the elastic member extending from the region in the forward direction is located within an angular range smaller than the inclination angle.

By doing the above, the distance between the lateral edge of the core and the longitudinal rear end of the elastic member is
The distance is greater than the distance between the side edge of the core and the longitudinal front end of the elastic member.

〔Example〕

Further, the present invention will be described below based on the illustrated embodiments with reference to the drawings.

As shown in FIG. 1, the diaper includes an absorbent core 1 having a required thickness and elongated in the longitudinal direction, a water permeable top sheet 2, an impermeable back sheet 3, and extending outward from both side edges of the core. a side flap 4 formed by both sheet parts, an elastic member 5 attached to the side flap so as to be elastic in the longitudinal direction thereof, and a tape flap attached to the outside of the rear end in the rear region of the diaper. 6. The diaper is symmetrical in configuration in the left and right regions across an imaginary longitudinal centerline 7, and is divided into a front region and a rear region through an imaginary lateral centerline 8.

The elastic member 5 extends in the front-rear direction of the diaper from the lateral center line 8 or a portion near it.

The portion of the elastic member 5 extending from the region toward the rear is inclined outwardly at an angle θ ₁ with respect to the longitudinal centerline 7 of the diaper, and the angle is 5 to 5.
30° is necessary to achieve the intended purpose of the present invention. The portion of the elastic member extending from the region in the forward direction lies substantially parallel to the longitudinal centerline 7.

In the diaper shown in FIG. 2, the portion of the elastic member 5 extending from the region toward the rear is inclined outward at an angle θ ₁ , that is, 5 to 30°, with respect to the longitudinal centerline 7 of the diaper. The position is the same as in the diaper shown in FIG. However, the portion of the elastic member 5 extending from the region in the forward direction is
It is tilted outward within the range of angle θ ₂ which is smaller than angle θ ₁ .

In the diapers shown in FIGS. 1 and 2, if the angle θ ₁ is less than 5°, the rear region of the diaper cannot sufficiently wrap around the buttocks, and if it exceeds 30°, Since the width of the side flap 4 is limited, the elastic member 5 cannot be formed and arranged to have a sufficient length.

The distance L ₁ between the inner edges of the rear ends of both elastic members 5 facing each other in the rear area is 120 to 260 mm, and both elastic members 5 facing each other in the front area
The distance L ₂ between the front inner edges of is preferably 80-250 mm. Further, it is preferable that the length of the effective stretchable portion of the elastic member 5 is 150 to 320 mm.

By arranging the elastic member 5 as described above, the distance between the lateral side edge of the core 1 and the rear end of the elastic member 5 in the length direction is equal to the distance between the side edge of the core and the front end of the elastic member 5 in the length direction. It is made larger than the distance between. The material of the elastic member 5 is not particularly limited, but natural or synthetic rubber, polyurethane foam, plastic film that develops or recovers elasticity through heat treatment, etc. can be used.

Core 1 is also not particularly limited in its material, but
Although not shown, there is an absorption/retention layer in which highly absorbent polymer particles are mixed in cotton-like pulp, fiber web, or nonwoven fabric, and an absorption/retention layer that has a lower density than this layer, has a large amount of space, and is resistant to moisture. It is preferable to use a separating layer which is a fibrous web having a high compression elastic recovery rate. This isolation layer is located between the top sheet 2 and the absorption/retention layer to isolate them, so that excrement fluid can quickly pass through the isolation layer, while excrement fluid absorbed by the absorption/retention layer can pass through the isolation layer. It is preferable to use a material that has the following functions: to reduce backflow to the upper surface of the absorbent/retaining layer and ooze out onto the top sheet 2, and to provide cushioning properties to the core 1 so as not to give the wearer a feeling of rigidity. In order to fully possess these functions, this isolation layer must have a length of 35 to
It is preferable that the 100 mm fibers are fused at the intersections and maintain a web form. The fibers used are hydrophobic fibers, preferably fibers of which at least 50% by weight have water-absorbing properties (so-called sweat-absorbing properties), especially sweat-absorbing polyester fibers. In addition, in order to facilitate fiber fusion, we use polyester fibers with a melting temperature of 110 to 200°C, polyethylene fibers, polypropylene fibers, polyethylene/polypropylene/low melting point (above temperature) polyester/regular polyester conjugate fibers (side-by-side). , core-sheath type), etc., in an amount of up to 30% by weight. The thickness of this isolation layer is ¹
The measurement after applying for a minute is 2~10mm, and the basis weight is 20~
80g/m ² , compression elastic recovery rate in wet state is 30% or more, preferably 50% or more, and fineness is 3-3
It is 13d.

The material of the top sheet 2 is not particularly limited, but it may be a nonwoven fabric whose fibers are fused to maintain the sheet form, or a nonwoven fabric whose fibers are intertwined with each other to maintain the sheet form and preferably have good permeability to excretory liquid. Therefore, it is possible to use a structure having small regular openings (not shown) throughout the entire structure, and the openings are formed by distributing fibers.

The material of the back sheet 3 is not particularly limited, but it is preferably made of a breathable and waterproof plastic film or a laminate of this and a nonwoven fabric.

Such a diaper is assembled and worn in a manner similar to known disposable diapers by securing the free ends of the tape fasteners 6 to opposite sides of the backsheet 3 in the front area.

(3) Effects of the invention In the diaper according to the invention, the elastic members are arranged as described above. The arrangement of such elastic members, i.e. their relative inclination angles in the front and rear regions of the elastic members through or near the imaginary transverse center line bisecting the diaper into front and rear regions, and the core and elastic Since the arrangement is such that the distance between the front and rear ends of the member in the longitudinal direction is defined, it has excellent adhesion to the body, especially the infant's crotch area, and the curves of the front and rear sides located through this, so that the infant can Even if you move your body vigorously, it is less likely to shift, and as a result, excrement, especially urine, is less likely to leak.

In particular, since the distance between the lateral edge of the core and the rear end of the elastic member in the longitudinal direction is larger than the distance between the lateral edge of the core and the front end of the elastic member in the longitudinal direction, The contractile force of the elastic member portion located in the front region of the diaper is not restricted by the rigidity of the core than that of the elastic member portion located in the front region, and the rear region of the diaper is pressed more strongly than the front region of the diaper, thereby preventing the leakage. can be even more effectively prevented. Therefore, it is extremely suitable for infants and young children who often use diapers while lying on their backs.

In addition, since the elastic member has an extremely simple form with a small inclination angle at the above-mentioned portion, the elastic member is processed at high speed in the diaper manufacturing equipment and is In order to deform the elastic member into such a shape, it is not necessary to use a means having a complicated mechanism, as is the case with conventional means for deforming this type of elastic member. Therefore, it is also suitable for high-speed production of diapers having such elastic members.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway developed plan view of a diaper showing an embodiment of the present invention, and FIG. 2 is a developed plan view of a diaper showing another embodiment. DESCRIPTION OF SYMBOLS 1... Core, 2... Top sheet, 3... Back seat, 4... Side flap, 5... Elastic member, 7... Virtual longitudinal center line, 8... Virtual horizontal center line.

Claims (1)

[Claims for Utility Model Registration] (1) A longitudinally elongated absorbent core, a water-permeable top sheet that covers at least the top surface of the core, an impermeable back sheet that covers at least the back surface of the core, and the opposite side of the core. A disposable diaper comprising: a water-impermeable side flap extending outward from the edge; and an elastic member attached to the side flap so as to be stretchable in the longitudinal direction, the elastic member dividing the diaper into a front region and a rear region. The elastic member extends in the front-rear direction of the diaper from an imaginary lateral center line that bisects the diaper or a region near the imaginary lateral center line, and a portion of the elastic member extending from the region to the rear direction extends outward by 5 to 30 degrees with respect to the imaginary longitudinal center line of the diaper. The portion of the elastic member that is inclined at an angle of 1° and that extends from the region in the forward direction is located within an angle less than the angle of inclination, so that the lateral edge of the core and the elastic The diaper, wherein the distance between the rear end of the member in the length direction is larger than the distance between the side edge of the core and the front end of the elastic member in the length direction. (2) The diaper according to claim 1, wherein the portion of the elastic member extending from the region toward the front is substantially parallel to the longitudinal centerline. (3) The portion of the elastic member extending from the portion in the forward direction is directed outward at an angle smaller than the inclination angle of the portion of the elastic member extending from the portion in the rear direction with respect to the longitudinal centerline. The diaper according to claim 1 of the utility model registration claim, which is inclined. (4) the distance between the rear inner edges of the two elastic members facing each other in the rear region is 120 to 260 mm;
The diaper according to claim 1, wherein the distance between the front inner edges of the opposing elastic members in the front region is 80 to 250 mm. (5) The length of the effective stretchable portion of the elastic member is 150~
The diaper according to claim 1 of the utility model registration claim, which has a diameter of 320 mm.