JP3510057B2 - Pants-type disposable diapers - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pants-type disposable diaper, and more particularly to a diaper in which characters such as Roman characters are drawn on side edges. 2. Description of the Related Art Conventionally, pants-type diapers are well known.
It is known as conventional means to provide an elastic member that expands and contracts in the peripheral direction at the periphery of the waist opening and the leg opening in order to improve the fit when the diaper is worn. It is also well known that an elastic member that expands and contracts in the circumferential direction is provided in a front waist region (front body) and a rear waist region (back body). When the diaper is in a non-wearing state, a number of gathers are formed on the outer surface of the diaper due to the contraction of the elastic member. When worn, many of the folds disappear. Among such diapers, characters or the like which can be visually recognized from the outside of the diaper may be drawn in the front waist region and the rear waist region for decoration and the like. [0003] In the above-mentioned diaper having pleats in the front waist area and the rear waist area, characters in the waist area are easily visually recognized when the pleats have almost disappeared when worn. When the diaper is in a non-wearing state, it is difficult to recognize characters. Therefore, characters that are preferably visible to the diaper consumer or supplier in a non-wearing state, for example, characters indicating the size, type, product name, etc. of the diaper are displayed even when drawn on the waist area with many folds. It is difficult to achieve the purpose. Accordingly, an object of the present invention is to make it possible to easily visually recognize characters drawn on a diaper even in a pants-type diaper in a non-wearing state. In order to solve the above-mentioned problems, the present invention is based on the premise that a liquid-absorbent core is provided between a liquid-permeable top sheet and a liquid-impermeable back sheet. Interposed, the longitudinal direction of the front and rear consists of a front waist region, a rear waist region and a crotch region located between these two regions, and the sheet material constituting each left and right side edge of each of the front and rear waist regions is mutually This is a disposable diaper that overlaps and adheres in the shape of a palm and has a pants shape. On this premise, the present invention is characterized in that a fixing portion of the sheet material at the side edge portion is formed to be thinner than a non-fixing portion around the portion, thereby defining a concave portion. The recess is visible from outside of the diaper in the vertical central region and the fixing portion adjacent to the waist opening in the vertical upper and lower regions around the waist along the side edge portion and the fixing portion adjacent to the leg opening. A fixing portion which is composed of any of hiragana, katakana, romaji and numeral characters, and wherein the fixing portion having the character is formed has a peel strength adjacent to the waist opening and a fixing portion adjacent to the leg opening. rather lower than that of, and the solid
Said non-adhering portion, wherein said attachment portion allows easy visualization of said portion
Higher light transmittance and / or light reflectance than the site
To have . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to the accompanying drawings, the details of the pants-type disposable diaper according to the present invention will be described below. In the explanation, when it is called sticking,
It means that the abutting members are in a substantially non-peelable state, and in the case of adhesion, the abutting members via an adhesive or a pressure-sensitive adhesive are in a releasable state or substantially It means that it cannot be peeled off. The pants-type diaper 1 shown in a partially cutaway perspective view in FIG. 1 is in a state where the left and right width directions are contracted. The diaper 1 includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a liquid-absorbent core 4 interposed between these two sheets 2, 3. , Core 4
Are overlapped at a portion extending from the peripheral edge thereof, and are bonded by a hot melt adhesive (not shown). The diaper 1 includes a front waistline area (front body) 6,
It has a rear waist area (rear body) 7 and a crotch area 8 located between these two areas 6 and 7. The front and rear waist regions 6 and 7 overlap each other at their left and right side edges in a palm shape and are fixed at a plurality of portions 9 to form a waist opening 11 and a pair of left and right leg openings 12. At the edges of the openings 11 and 12 around the waist and the legs, a waist elastic member 13 and a leg elastic member 14 extending in the respective circumferential directions are located between the front and back sheets 2 and 3, and are stretched. 3 is adhered to at least one inner surface. In the figure, these elastic members 13 and 14 are in a contracted state. The topsheet 2 is composed of a thermoplastic film having a liquid-permeable opening, a thermoplastic synthetic fiber non-woven fabric, a laminate of such a film and a non-woven fabric, or the like. The back sheet 3 is constituted by a stretchable inner sheet 3A made of a thermoplastic synthetic resin elastomer and a non-stretchable outer sheet 3B made of a thermoplastic synthetic fiber nonwoven fabric. The front waist region 6 has a large number of portions 21 where the two sheets 3A and 3B are fixed to each other, and a large number of folds 22 extending in the vertical direction of the diaper 1. The core 4 is made of ground pulp,
It is a shaped product of a mixture of ground pulp and superabsorbent polymer. FIGS. 2 and 3 are plan views of the back sheet 3 at a portion surrounded by a virtual line 20 in FIG.
It is an III line end view. Inner sheet 3A of back sheet 3
Has elasticity in the diaper width direction, and is in a contracted state in these figures. The outer sheet 3B has a large number of pleats 22 extending substantially in the vertical direction of the diaper 1. These inner and outer sheets 3A and 3B are
At least one synthetic resin component is melted and solidified to be integrated with each other. The fixing portions 21 are arranged close to each other on an imaginary line extending in a required direction. In FIG. 2, a large number of parallel imaginary lines 26 having an upper right slope, and a lower right Are arranged on each of a number of parallel imaginary lines 27 having a gradient of. The two lines 26 adjacent to each other and the two lines 27 intersecting and adjacent to each other define a substantially rectangular area 28 in which the outer sheet 3
B rises from the inner sheet 3A to form a fold 22. The folds 22 are indefinite and the number of the ridges cannot be clearly counted. However, when attention is paid to the tops 29 of the folds 22, there is one top 29 in one area 28 in the end view of FIG. There are cases where there are two or more cases. The back sheet 3 stops when the inner sheet 3A extends elastically and the folds 22 of the outer sheet 3B extend completely. The back sheet 3 is an elastic sheet 3
The raw material of A is stretched in a direction corresponding to the width direction of the diaper 1 at a required magnification, and the raw material of the non-stretchable sheet 3B is stacked thereon,
What is necessary is just to pass the raw material of these two sheets 3A and 3B between the hot embossing rolls to obtain a laminated sheet having the fixed portion 21 of the required layout. This laminated sheet is a raw material of the back sheet 3, and in the diaper 1 manufactured using the sheet 3A in the stretched state, when the sheet 3A contracts,
As shown in FIG. 1, a pleat 22 extending in a direction crossing the contraction direction appears. However, the manner in which the folds 22 appear varies depending on the layout of the fixing portions 21. FIG. 4 is an end view taken along the line IV-IV of FIG. As shown in FIG. 1, the fixing portion 9 on the side edge of the diaper 1 has a plurality of linear portions 9 </ b> A extending in the left-right direction in the vertical upper and lower regions around the waist along the side edge.
And a Roman-shaped portion 9B denoted by OYASUMI in the central region in the vertical direction. As apparent from FIG. 4, the adhesions 9A, 9B is surrounded by a non-anchor site 31, the site 9A has a thickness _{t A,} site 9B has a thickness _{t B.} One non-fixed portion 31 has a thickness T. These thicknesses are t _A , t _B <T, preferably t _A , t _B <T × ２, more preferably t _A , t _B <T × １ ／. Also, t _A
≧ 0, t _B > 0 and t _A = 0 when the small opening 32 is formed in the diaper side edge, and the front and rear waist area 6 around the opening 32 , 7 are fixed (see the left end of FIG. 4). At the side edge, at least part 9B of the fixing parts 9A and 9B
However, a concave portion 33 is formed on the front side and / or the rear side of the side edge portion, and the concave portion 33 draws the Romaji.
The concave portion 33 includes, in addition to Roman characters, hiragana, katakana, numerals,
Can draw characters such as kanji. Since these characters can be visually recognized from the outside of the diaper, they can be used to display the product name of the diaper or to indicate that the diaper is for boys or girls by writing BOY or GIRL. The fixing portion 9A is composed of a fixing portion adjacent to the waist opening and a fixing portion adjacent to the leg opening in the vertical upper and lower regions around the waist along the side edge, and forms the concave portion 33. ing. In order to form the fixing portions 9A and 9B, top sheets 2 and 3 containing a thermoplastic synthetic resin component are overlapped, and these sheets 2 and 3 may be locally heated and pressed. At the heating / pressing portion, the resin component is melted and solidified, and the respective sheets 2 and 3 are united to form thin film-like portions 9A and 9B. As a result, the concave portion 33 is obtained because the original shape of the above is maintained and the thick non-fixed portion 31 is formed. As shown in FIG. 1, in a state where the plurality of fixing portions 9A extend in the waist direction in the vertical upper and lower regions along the side edge portion and are closely parallel to each other, the side edge portion is rotated around the torso while wearing the diaper. Peeling off the opening 11 and the leg opening 12 as a base end,
It can be prevented from separating back and forth. If the upper and lower regions are firmly fixed as such, the upper and lower central regions do not have to be as dense as the upper and lower regions. Therefore, the selection of the character used for the central area is relatively free in the selection of the shape, the size, the distance between the characters, and the like. If the peel strength in the central region can be relatively reduced in this manner, the mother can be favored because a large force is not required when the dirty diaper 1 is peeled back and forth and removed. The drawn characters can be clearly distinguished from the surrounding non-fixed portions 31 so that they can be easily read.
It is preferred that as large as possible a difference between the thickness t _B and the thickness T of the non-anchor site 31 of the anchor site 9B. However, since it is impossible to greatly change the thickness t _B of the film-shaped anchor site 9B, to increase the difference in thickness, using a relatively bulky lies nonwoven to any one of the top- and backsheets 2, 3, The apparent thickness T of the non-fixed portion 31 may be increased. Incidentally, the thickness T of the portion 31 and the thickness of the nonwoven fabric are based on JIS L 1096,
measured in gf / cm ^2, the thickness _{t B} of the site 9B is measured with a micrometer. A character that is easy to read can also be obtained by giving a large difference in the light transmittance and the light reflectance between the fixed portion 9B and the non-fixed portion 31. For example, a film having a smooth surface and a relatively high light transmittance is formed on the fixed portion 9B, and the non-fixed portion 31 is formed by simply overlapping the front and back sheets 2 and 3 and has a lower transmittance than the portion 9B. Then, the portion 9B becomes a portion having higher transparency or translucency as compared with the portion 31 and is distinguished from the non-adhered portion 31 to facilitate reading of characters. The portion 9B may be a film having a high light reflectance. According to the present invention, like the diaper 1 in the illustrated example,
A sheet-like elastic member (inner sheet) 3A is disposed in an extended state in any of the front and rear waist regions 6 and 7, and is implemented in such a manner that a large number of folds 22 are formed on the back sheet 3 when in a non-wearing state. In addition to the above, the sheet-like elastic member 3A is replaced with a band-like elastic member, or the front and rear waist region 6,
It is also possible to carry out in a mode in which the folds 22 are scarcely formed on the 7. Even if the back sheet 3 has a large number of folds 22, the inner sheet 3A freely shrinks at the side edges or the shrinkage is suppressed by the fixing portions 9A and 9B, so that folds hardly occur. The characters drawn on such side edges, regardless of whether the diaper is worn or not
Easy to see. The characters drawn at the fixing portion 9B can be replaced by printed characters. It is natural that the printing ink used at that time should be safe and harmless to infants, but nevertheless, it should be avoided as much as possible for the ink to touch the mouth of infants. In that sense, it is preferable that the character is drawn by the fixing portion 9B rather than by printing. In the disposable diaper according to the present invention, characters are drawn on the side edges where gathers are unlikely to occur.
Regardless of whether the diaper is in a worn state or not, the character can be visually recognized.

[Brief description of the drawings] FIG. 1 is a partially broken perspective view of a diaper. FIG. 2 is a partial view of a back sheet. FIG. 3 is an end view taken along line III-III of FIG. 2; FIG. 4 is an end view taken along line IV-IV of FIG. 1; [Explanation of symbols] 1 Diapers 2 Surface sheet 3 Back sheet 4 core 6 Front waist area 7 Rear waist area 8 Inseam area 9,9A, 9B fixing part 31 Non-joined part

Claims (1)

(57) [Claims 1] A liquid-absorbent core is interposed between a liquid-permeable top sheet and a liquid-impervious back sheet, and the longitudinal direction of the front and rear is a front waist region and a rear waist. The disposable material is composed of a surrounding area and a crotch area located between these two areas, and sheet materials constituting left and right side edges of each of the front and rear waist circumference areas are overlapped and fixed to each other in a palm shape, and have a pants-type disposable. In the diaper, the fixing portion of the sheet material at the side edge portion is formed to be thinner than a non-fixing portion around the portion to define a concave portion, and the concave portion defines a body along the side edge portion. Any one of the hiragana, katakana, romaji and numerals visible from outside of the diaper in the vertical center area and the fixing area adjacent to the waist opening in the surrounding vertical upper and lower areas and the fixing area adjacent to the leg circumference opening From the sticking part where the character was drawn Made, the anchoring site Egai characters peel strength rather lower than that of the anchor site adjacent to the anchor site and the leg-openings adjacent said waist-hole and the fixing site, the
Higher than the non-fixed part allowing easy visualization of the part
The diaper as described above, which has a high light transmittance and / or light reflectance .