JP3605584B2 - Pants-type disposable diapers - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pants-type disposable diaper, and more particularly to a diaper having characters drawn on side edges.
[0002]
[Prior 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]
[Problems to be solved by the invention]
The diaper having folds in the front waist area and the rear waist area is such that when the diaper is worn and the folds almost disappear, the characters in the waist area can be easily recognized, and when the diaper is in a non-wearing state. It is difficult to see 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.
[0004]
Therefore, 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.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is based on the premise that a liquid-absorbent core is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and a front waist region and a rear waist region. When, and a crotch region extending between these waist regions, the back sheet is formed from a composite sheet obtained by integrating the elastic inner sheet and the non-stretchable outer sheet, said front and rear waist regions each side edge is fixed overlap the butt-seamed, and is a disposable diaper-type pants waist opening and a pair of leg-holes are formed.
[0006]
On this premise, the present invention is characterized in that the inner sheet and the outer sheet are joined via a plurality of joining portions extending in the vertical direction while intersecting each other, and the outer sheet is attached to the joining portion. A plurality of pleats extending up and down in the rectangular area defined between and rising from the inner sheet, the area having a first section having the crease with one crest, The front and back sheets are fixed at a plurality of fixing portions which are intermittently arranged in the vertical direction at the side edges of the front and rear waist circumference region. The fixing portion forms a concave portion having a thickness smaller than that of the non-fixing portion around the fixing portion, and is located in the vertical upper and lower regions of the side edge portion and adjacent to the waist opening and the leg opening. The first solid A site and, the side edge portions longitudinally located in the central region in Hiragana visible from outside the diaper, katakana, in that it is formed from a second fixation site draw any text information Roman .
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
The details of the pants-type disposable diaper according to the present invention will be described below with reference to the accompanying drawings. In the description, the term "fixing or joining " means that the abutting parts are in a state in which they cannot be substantially peeled off, and the term "adhesion" means that the abutting parts can be peeled off with an adhesive or an adhesive. Or a state in which it cannot be substantially peeled off.
[0008]
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 topsheet 2 of liquid-permeable, a back sheet 3 liquid-impervious, and an absorbent core 4 which is interposed between these two sheets 2, 3. Top- and backsheets 2, 3 overlap in portions extending from the peripheral edge of the core 4 are bonded together by hot melt adhesive (not shown) in the portion.
[0009]
The diaper 1 has a front waist region (front body) 6, a rear waist region (back body) 7, and a crotch region 8 located between the both regions 6,7. The front and rear waist regions 6, 7 are top- and backsheets 2, 3 overlap one another in butt-seamed at the left and right side edge portions of these waist regions 6, 7 are fixed via a plurality of anchor site 9. The diaper 1, a waist-hole 11, a pair of right and left leg openings 12 are formed. The edges of the waist-hole 11 and the leg-holes 12, and the waist elastic members 13 and leg elastic members 14 extending in the respective surrounding directions is interposed between the top- and backsheets 2, they in stretched state It is adhered to at least one inner surface of the sheets 2 and 3. In the figure, these elastic members 13 and 14 are in a contracted state.
[0010]
The topsheet 2 is composed of a thermoplastic film having a liquid-permeable opening, a thermoplastic synthetic fiber nonwoven fabric, a laminate of these films and a nonwoven fabric, and the like. The back sheet 3 is a composite sheet composed of 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 inner sheet 3A and the outer sheet 3B are joined via a plurality of joining portions 21 that cross each other and extend in the up-down direction. A large number of pleats 22 extending in the vertical direction of the diaper 1 are formed in at least the front waist region 6 of the front and rear waist regions 6 and 7. The core 4 is a shaped product of ground pulp or a mixture of ground pulp and a superabsorbent polymer.
[0011]
2 and 3 are a plan view of the back sheet 3 at a portion surrounded by a virtual line 20 in FIG. 1 and an end view taken along the line III-III of FIG. The inner sheet 3A of the back sheet 3 has elasticity in the width direction of the diaper 1, 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. At the joint portion 21, at least one of the inner and outer sheets 3A and 3B is integrated by melting and solidifying at least one synthetic resin component. The joining 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 imaginary line are shown. Are arranged on each of a number of parallel imaginary lines 27 having a gradient of. And two lines 26 adjacent to each other, and the two lines 27 adjacent to each other in line 26 and intersection difference, defining a generally rectangular area 28. In each section 28, the outer sheet 3B rises from the inner sheet 3A, forming a pleat 22. In the end view of FIG. 3, the folds 22 may have one peak 29 in one area 28 or may have two or more peaks 29 . The zone 28 is formed from a first zone having a single crest and a second zone having a crease having two or more tops. The back sheet 3 stops when the inner sheet 3A extends elastically and the folds 22 of the outer sheet 3B extend completely.
[0012]
The back sheet 3 extends the original sheet of the stretchable sheet 3A at a required magnification in a direction corresponding to the width direction of the diaper 1, and overlaps the original sheet of the non-stretchable sheet 3B thereon. The raw sheet may be passed between hot embossing rolls to obtain a laminated sheet having a joining portion 21 of a required layout. When the sheet 3A is contracted in the diaper 1 manufactured using the sheet 3A in the stretched state, which is an original sheet of the back sheet 3 and crosses the contraction direction as illustrated in FIG. A pleat 22 extending in the opposite direction appears. However, the manner in which the folds 22 appear varies depending on the layout of the joint portion 21.
[0013]
FIG. 4 is an end view taken along line IV-IV of FIG. As shown in FIG. 1, adhesions 9 at the side edges of the diaper 1, linear fixation of plural rows extending in the lateral direction is positioned longitudinally above and below zone of the side edge portions of the front and rear waist regions 6, 7 A portion 9A (a first fixing portion) and a fixing portion 9B (a second fixing portion ) which is located in the longitudinal center region of the side edges of the front and rear waist regions 6 and 7 and which draws a Roman character (character information) described as OYASUMI. ) and it is constructed from. The fixing portion 9A is adjacent to the waist opening 11 and the leg opening 12. As apparent from FIG. 4, the adhesions 9A, 9B have their periphery surrounded by a non-anchor site 31, the site 9A has a thickness _{t A,} site 9B has a thickness _{t B.} On the other hand, the 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 ／. When t _A ≧ 0 and t _B > 0 and t _A = 0, it means that the small opening 32 is formed in the diaper side edge, and the front and rear sides of the opening 32 The front and back sheets 2, 3 constituting the waist regions 6, 7 are fixed (see the left end portion in FIG. 4). The fixing portion 9A forms a recess 33 that is thinner than the non-fixing portion 31. The fixing portion 9B forms a concave portion 33 which is thinner than the non-fixing portion 31, and draws the Roman character. The fixing portion 9B can draw character information such as hiragana, katakana, and kanji in addition to the Roman characters. These character information, since visible from the outside of the diaper 1, or to display the product name of the diaper 1, in that the diaper 1 wrote like a BOY or GIRL to or display it is for men or for women Available.
[0014]
In order to form the fixing portions 9A and 9B, the front and back sheets 2 and 3 containing a thermoplastic synthetic resin component may be overlapped, and these sheets 2 and 3 may be locally heated and pressed. At the heating / pressing portion, the resin is melted and solidified, and the respective sheets 2 and 3 are united to form thin film-like fixing portions 9A and 9B . At the non-heated and non-pressed portions, the sheets 2 and 3 retain their original shape and form the thick non-fixed portion 31, and as a result, the concave portion 33 is obtained. As shown in FIG. 1, in a state where the plurality of fixing portions 9 </ b> A are located in the vertical upper and lower regions of the side edges of the front and rear waist regions 6 and 7 and extend in the waist direction, and are closely parallel to each other, It is possible to prevent the side edges from peeling off while using the diaper 1 with the waist opening 11 or the leg opening 12 as a base end, thereby preventing the diaper 1 from being separated back and forth. If the upper and lower regions are firmly fixed in such a manner, even if the fixing region is not as dense as the vertical upper and lower regions of the side edges in the vertical center regions of the side edges of the front and rear waist regions 6 and 7. Will be better. Therefore, when selecting character information to be used in the central region in the vertical direction , selection of a shape, a size, a distance between characters, and the like is relatively free. 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.
[0015]
Eka character information was can clearly identify the non-anchor site 31 around, so that it can easily read, as much as possible to increase the difference between the thickness T of the thickness t _B and the non-anchor site 31 of anchor site 9B Is preferred. 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 and the nonwoven fabric in the thickness of the zone 31 conforms to JIS L 1096, measured at pressure conditions 7 gf / cm ^2, the thickness _{t B} of the site 9B is measured with a micrometer. Character information that is easy to read can also be obtained by giving a large difference in light transmittance and 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 than the portion 31 and is distinguished from the non-adhered portion 31 to facilitate reading of character information . The portion 9B may be a film having a high light reflectance.
[0016]
The present invention provides a back sheet when a sheet-like elastic member (inner sheet) 3A is disposed in an extended state in one of the front and rear waist regions 6 and 7 as in the illustrated diaper 1, and is in a non-wearing state. In addition to the embodiment in which a large number of pleats 22 are formed on the sheet 3, the sheet-like elastic member 3A is replaced with a band-like elastic member, or there is almost no pleat 22 in the front and rear waist regions 6, 7 without the elastic member 3A. It can also be implemented in embodiments. 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 almost no folds occur. Such character information drawn on the side edge portion can be easily recognized regardless of whether the diaper is in a worn state or not.
[0017]
The character information drawn at the fixing portion 9B can be replaced with a print character. 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 information is drawn by the fixing portion 9B rather than by printing.
[0018]
【The invention's effect】
In the disposable diaper according to the present invention, the character information is drawn on the side edge portion where gathers are unlikely to occur, so that the character information can be visually recognized regardless of whether the diaper is in a worn state.
[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]
DESCRIPTION OF SYMBOLS 1 Diaper 2 Top sheet 3 Back sheet 4 Core 6 Front waist area 7 Rear waist area 8 Inseam area 9 Adhering part
9A fixing part (first fixing part)
9B fixing part (second fixing part)
21 Joint site
22 folds 31 non-adhered part 33 recess

Claims (3)

Absorbent core interposed between the liquid-permeable topsheet and liquid-impermeable back sheet, a front and a waist region and a rear waist region, a crotch region extending between these waist regions , the back sheet is formed from a stretchable inner sheet and the non-stretchable composite sheet obtained by integrating the outer sheet, the side edges of the front and rear waist regions are secured overlap the butt-seamed, waist-hole in the disposable diaper of the pair of leg-openings and the pants-type which is formed,
The inner sheet and the outer sheet are joined via a plurality of joining portions that extend in the vertical direction so as to intersect with each other, and the outer sheet is vertically attached to a rectangular area defined between the joining portions. Forming a plurality of pleats extending from the inner sheet, wherein the first section has one crest and the second section has two or more crests. And formed from
At the side edges of the front and rear waist area, the front and back sheets are fixed via a number of fixing parts intermittently arranged in the vertical direction, and the fixing part has a thickness greater than that of the non-fixing part around the fixing part. Forming a thin concave portion, a first fixing portion located in a vertical vertical region of the side edge portion and adjacent to the waist opening and the leg peripheral opening, and a first fixing portion located in a vertical central region of the side edge portion; The diaper is characterized by being formed from a second fixed portion that draws any character information of hiragana, katakana, and romaji that is visible from the outside of the diaper. The diaper according to claim 1, wherein the peel strength of the second fixing portion is lower than that of the first fixing portion . 3. The method according to claim 1, wherein the first and second fixing portions have a higher light transmittance and / or a higher light reflectance than the non-fixing portion so that the fixing portions can be easily viewed. 4. The diaper described.

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