JP3962681B2 - Disposable diapers - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
[0002]
This invention relates to the disposable diaper which improved the visibility of the symbol display.
[Prior art]
[0003]
Generally, in a disposable diaper, as a technique for increasing the user's willingness to purchase (for example, a mother or a child), a symbol such as a specific character may be displayed on the waist portion. This symbol display may be printed on the surface of the back sheet, which is an outer layer sheet, but is printed on a member located on the inner surface side of the back sheet (for example, a waterproof film covering the anti-wearer side of the absorber). There are many cases (see, for example, Patent Document 1). In this case, a non-woven fabric is often used as the back sheet, and as the non-woven fabric, a material containing titanium oxide for whitening and not so high in transparency is often used.
[0004]
In addition, in the case of a pants-type disposable diaper, it is well known that a large number of elastic members that contract in the circumferential direction are arranged around the waist part so as to prevent slippage during wearing. The rubber thread is used. This thread rubber often contains titanium oxide for whitening.
[0005]
In the case of a pants-type disposable diaper having a symbol display, the symbol display and the rubber thread as the elastic member are arranged so as to overlap each other.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-104172.
[Problems to be solved by the invention]
[0007]
However, in the case of the above conventional example, the transparency of the non-woven fabric constituting the back sheet is not so high, so the visibility of the symbol display formed on the inner surface side of the back sheet is lowered, and the design is unclear. As a result, there is a problem that the user's willingness to purchase is intriguing.
[0008]
Moreover, when the rubber thread which is an expansion / contraction member overlaps with the symbol display, the presence of the rubber thread becomes conspicuous, and the visibility of the symbol display may be significantly reduced.
[0009]
This invention is made | formed in view of said point, and aims at making it possible to promote a user's willingness to purchase by improving the visibility of a symbol display.
[Means for Solving the Problems]
[0010]
In the present invention, as a first means for solving the above problems, a liquid-permeable top sheet located on the wearer side, a liquid-impermeable back sheet located on the anti-wearer side, and both these sheets In a disposable diaper comprising an absorbent body interposed therebetween and forming a symbol display portion on the inner surface side of the back sheet in the waistline portion, an elastic member that contracts in the circumferential direction is disposed in the waistline portion, The elastic member is made of a thread rubber having a titanium oxide content of 5% by weight or less, and the backsheet is made of a material including a nonwoven fabric layer having a titanium oxide content of 5% by weight or less .
[0011]
By configuring as described above, the whiteness of the non-woven fabric layer constituting the backsheet covering the symbol display portion is reduced and the transparency is increased, so that the symbol display portion formed on the inner surface side of the backsheet is visually recognized. Will be improved. Therefore, the user's willingness to purchase is intriguing. Moreover, since the whiteness of the rubber thread constituting the expandable member is reduced and the transparency thereof is increased, the rubber thread becomes inconspicuous and the visibility of the symbol display portion is improved. Therefore, the user's willingness to purchase is intriguing. The content of titanium oxide in the yarn rubber and backsheets are 5 wt% or less, rather preferably that made to be 0.5 wt% or less, of course, so that does not contain titanium oxide at all It can also be. Further, the reduction of the titanium oxide content in the thread rubber and non-woven fabric layers is performed at the respective production stages.
[0012]
In the present invention, as a second means for solving the above-mentioned problem, in the disposable diaper provided with the first means, the backsheet is a nonwoven fabric layer having an opacity of less than 40% based on JIS P 8138. The transparency of the non-woven fabric layer constituting the back sheet covering the symbol display part is improved to such an extent that it does not hinder the visual recognition of the symbol display part. This will motivate users to purchase.
[0013]
In the present invention, as a third means for solving the above-mentioned problems, in the disposable diaper provided with the first or second means, the backsheet has a fineness of fibers constituting the backsheet of 1. It can also be comprised with the raw material containing the nonwoven fabric layer which is 0.0-5.0dt, and a fabric weight is 30 g / m < ² > or less, and when comprised in that way, the nonwoven fabric layer which comprises a back sheet does not impair transparency. It is a grade that does not deteriorate the touch and is excellent in stretchability and texture. In addition, when the fineness of the fibers constituting the nonwoven fabric layer is 1.0 dt or less, the eyes become too fine and it becomes difficult to secure a predetermined transparency, and when the fineness of the fibers constituting the nonwoven fabric layer is 5.0 dt or more, Becomes too rough and feels bad. Moreover, when the fabric weight of a nonwoven fabric layer exceeds 30 g / m < ² >, it will become bulky and will be inferior to a stretching property and a texture.
[0014]
In the present invention, as a fourth means for solving the above SL problem, a topsheet which is positioned in the wearer's side, a backsheet positioned on counter wearer's side, the absorber is interposed between these two sheets A disposable diaper having a pattern display portion formed on the inner surface side of the back sheet in the waistline portion , and a stretchable member that contracts in the circumferential direction is disposed on the waistline portion, and the stretchable member contains titanium oxide. The amount is constituted by a rubber thread having a weight of 5% by weight or less .
[0015]
By comprising as mentioned above, since the whiteness of the rubber thread which comprises an expansion-contraction member falls and the transparency becomes high, a rubber thread becomes inconspicuous and the visibility of a symbol display part will improve. Therefore, the user's willingness to purchase is intriguing. The content of titanium oxide in the yarn rubber, 5 but are by weight percent, rather preferably that made to be 0.5 wt% or less, of course, possible not contain titanium oxide at all You can also. Further, the titanium oxide content in the thread rubber is reduced in the manufacturing stage.
DETAILED DESCRIPTION OF THE INVENTION
[0016]
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0017]
This disposable diaper is a pants type, and as shown in FIGS. 1 to 3, the front viewing part 2 located on the lower abdomen side of the wearer, the rear viewing part 3 located on the buttocks side of the wearer, and the crotch A back sheet 1 having a portion 4 and having flexibility, and being fixed to the inner surface of the back sheet 1, with the crotch part 4 as a center, in the front-rear direction (in other words, from the front viewing part 2 to the rear viewing part 3 ) And the absorbent body 5 extending.
[0018]
The backsheet 1 is formed by laminating and fixing two air-permeable and liquid-permeable nonwoven fabric layers. In the final stage of the manufacturing process after the backsheet 1 and the absorbent body 5 are superposed, Both side edges with the back body (that is, both side edges of the front viewing part 2 and the back viewing part 3) are joined by joining means such as ultrasonic sealing and heat melting (this joining part is indicated by T). Thus, as shown in FIG. 3, a waist opening 6 and a pair of left and right suspension openings 7, 7 are formed. In addition, when removing this disposable diaper, it is not removed, but it removes as the expansion | deployment state shown in FIG. 1 by tearing the said junction part T forcibly. In this way, excrement can be easily processed.
[0019]
As shown in FIG. 1 and FIG. 2, the absorbent body 5 has a rectangular shape with a certain degree of rigidity, wraps around from the back surface to the front surface side and covers both sides of the front surface side in a frame-wrapped form. A liquid-impervious waterproof film 8 is wrapped, and on the wearer side, a rectangular liquid-permeable top sheet 9 made of a nonwoven fabric or the like that directly touches the wearer's skin is a hot melt adhesive HM. Is integrated by bonding.
[0020]
The absorbent body 5 is preferably composed mainly of defibrated pulp and used in combination with a polymer-absorbing polymer. Further, as the waterproof film 8, a polyethylene film or the like is used. When it is necessary to increase the absorption capacity, it is desirable to interpose a liquid-permeable second sheet 9 ′ between the liquid-permeable top sheet 9 and the absorber 5 as shown in FIG.
[0021]
The absorbent body 5 is bonded and integrated with the back sheet 1 by the hot melt adhesive HM, leaving only a small part on both sides of the waterproof film 8.
[0022]
On both side portions of the absorbent body 5, standing leg cuffs 11, 11 projecting toward the wearer are formed.
[0023]
In the waist part (in other words, the front-viewing part 2 and the back) of the disposable diaper, the symbol display parts 12 and 12 are formed by printing on the waterproof film 8 located on the inner surface side of the back sheet 1. .
[0024]
Moreover, between the nonwoven fabric layers of the said back sheet 1, in order to improve the fit property of a waist circumference in a front body and a back body, it is for waists which consist of thin thread rubber spaced apart in parallel with the edge of the waistline opening part 6. FIG. Expandable members 13, 13... Are provided. The interval and the number of the elastic members 13, 13,... For the waist are determined as appropriate. For example, the interval is about 4 to 6 mm, and preferably about 5 to 7.
[0025]
Further, between the nonwoven fabric layers of the backsheet 1, the expansion member for the front viewing in the direction parallel to the edge of the waist opening 6 (see FIG. 3) at both sides corresponding to the front viewing portion 2 and the rear viewing portion 3. Are provided with elastic members 15, 15... The elastic members 14 and 15 are made of rubber thread, and may be cut to an appropriate length so that the elastic elastic force does not act at a portion corresponding to the absorber 5.
[0026]
By the way, when comprised as mentioned above, since the elastic members 14 and 15 and the backsheet 1 exist on the symbol display unit 12, if the transparency of the backsheet 1 is low, the symbol display unit 12 is unclear. Thus, the visibility is lowered, and if the rubber thread constituting the elastic members 14 and 15 is too conspicuous, the symbol display unit 12 becomes unclear and the visibility is lowered. Therefore, in the present embodiment, the visibility of the symbol display unit 12 is improved by increasing the transparency of the back sheet 1 and the elastic members 14 and 15.
[0027]
In general, the nonwoven fabric layer constituting the back sheet 1 and the thread rubber constituting the stretchable members 14 and 15 are blended with titanium oxide for the purpose of improving the whiteness, but in this embodiment, The back sheet 1 is made of a material including a nonwoven fabric layer from which titanium oxide has been removed, and the elastic members 14 and 15 are made of thread rubber from which titanium oxide has been removed.
[0028]
By having comprised as mentioned above, the whiteness of the nonwoven fabric layer which comprises the back sheet 1 which covers the symbol display part 12 falls, and the waterproof film 8 located in the inner surface side of the back sheet 1 from the place where the transparency becomes high. As a result, the visibility of the symbol display part 12 printed and formed is improved, the whiteness of the rubber thread constituting the elastic members 14 and 15 is reduced, and the transparency thereof is increased, so that the rubber thread becomes inconspicuous. The visibility of the symbol display unit 12 is improved. Therefore, the user's willingness to purchase is intriguing. The titanium oxide is removed at the stage of manufacturing the non-woven fabric layer and the thread rubber. The removal means, for example, that titanium oxide is 5% by weight or less, preferably 0.5% by weight or less. Of course, no titanium oxide can be contained. .
[0029]
The backsheet 1 is preferably made of a material including a nonwoven fabric layer having an opacity of less than 40% based on JIS P 8138. The opacity can be measured according to JIS P 8138 using a “colorimetric color difference meter” manufactured by Nippon Denshoku Industries Co., Ltd. If it does in this way, the transparency of the nonwoven fabric which comprises the back sheet 1 which covers the symbol display part 12 will improve to such an extent that there is no trouble in visually recognizing the symbol display part 12, and a user's willingness to purchase will be intrigued.
[0030]
The backsheet 1 is preferably made of a material including a non-woven fabric layer having a fiber fineness of 1.0 to 5.0 dt and a basis weight of 30 g / m ² or less. If it does in this way, while the raw material containing the nonwoven fabric layer which comprises the back sheet 1 will be a thing which is a grade which does not impair transparency, and a touch does not worsen, it will be excellent in a stretching property and the texture. In addition, when the fineness of the fibers constituting the nonwoven fabric layer is 1.0 dt or less, the eyes become too fine and it becomes difficult to secure a predetermined transparency, and when the fineness of the fibers constituting the nonwoven fabric layer is 5.0 dt or more, Becomes too rough and feels bad. Moreover, when the fabric weight of a nonwoven fabric layer exceeds 30 g / m < ² >, it will become bulky and will be inferior to a stretching property and a texture.
[0031]
Further, the opacity (in other words, transparency) of the rubber thread constituting the elastic members 14, 15 is desirably equal to that of the nonwoven fabric, and the thickness is desirably 925 dtex or less.
【The invention's effect】
[0032]
According to the first means of the present invention, it comprises a top sheet positioned on the wearer side, a back sheet positioned on the anti-wearer side, and an absorbent body interposed between these sheets, In the disposable diaper formed with a symbol display part on the inner surface side of the back sheet, an elastic member that shrinks in the circumferential direction is disposed in the waist part, and the elastic member has a titanium oxide content of 5% by weight or less. Constructed with rubber thread, the backsheet is composed of a material containing a nonwoven fabric layer with a titanium oxide content of 5% by weight or less, and the whiteness of the nonwoven fabric layer constituting the backsheet covering the design display portion decreases, Since the transparency is increased, the visibility of the symbol display portion formed on the inner surface side of the backsheet is improved, which has the effect of incentivizing the user to purchase. . In addition, since the whiteness of the rubber thread constituting the elastic member is reduced and its transparency is increased, the rubber thread is made inconspicuous, so that the visibility of the symbol display portion is improved and the user's willingness to purchase There is also an effect that makes it even more intriguing.
[0033]
As in the second means of the present invention, in the disposable diaper provided with the first means, the backsheet may be made of a material including a nonwoven fabric layer having an opacity of less than 40% based on JIS P 8138. In such a case, the transparency of the non-woven fabric layer constituting the back sheet covering the symbol display portion is improved to the extent that it does not hinder the visual recognition of the symbol display portion, and the user's willingness to purchase is intrigued. Become.
[0034]
As in the third means of the present invention, in the first or a disposable diaper having a second means, the back sheet, fineness of the fibers constituting the back sheet is at 1.0~5.0dt Yes, it can also be constituted by a material including a nonwoven fabric layer having a basis weight of 30 g / m ² or less. In addition to being unsatisfactory, it has excellent stretchability and excellent texture. In addition, when the fineness of the fibers constituting the nonwoven fabric layer is 1.0 dt or less, the eyes become too fine and it becomes difficult to secure a predetermined transparency, and when the fineness of the fibers constituting the nonwoven fabric layer is 5.0 dt or more, Becomes too rough and feels bad. Moreover, when the fabric weight of a nonwoven fabric layer exceeds 30 g / m < ² >, it will become bulky and will be inferior to a stretching property and a texture.
[0035]
According to the 4th means of this invention, it is provided with the top sheet located in the wearer side, the back sheet located in the anti-wearer side, and the absorber interposed between these both sheets, The above-mentioned in the waist part In the disposable diaper formed with a symbol display part on the inner surface side of the back sheet, an elastic member that shrinks in the circumferential direction is disposed in the waist part, and the elastic member has a titanium oxide content of 5% by weight or less. The rubber thread is made of rubber thread, and the whiteness of the rubber thread constituting the elastic member is lowered and the transparency thereof is increased. Therefore, the rubber thread becomes inconspicuous and the visibility of the symbol display part is improved. The effect is that it will incentivize the purchase will.
[Brief description of the drawings]
FIG. 1 is a developed plan view of a disposable diaper according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part of the disposable diaper according to the embodiment of the present invention.
FIG. 3 is a perspective view of a disposable diaper according to an embodiment of the present invention.
[Explanation of symbols]
1 is a back sheet (nonwoven fabric), 2 is a front view part, 3 is a back view part, 5 is an absorber, 8 is a waterproof film, 9 is a top sheet, 12 is a symbol display part, 14 and 15 are elastic members (thread rubber) ).

Claims (4)

A top sheet positioned on the wearer side, a back sheet positioned on the anti-wearer side, and an absorbent body interposed between the two sheets, and a symbol display portion is formed on the inner surface side of the back sheet at the waist portion In the disposable diaper, a stretchable member that contracts in the circumferential direction is disposed on the waistline portion, and the stretchable member is made of thread rubber having a titanium oxide content of 5% by weight or less. A disposable diaper characterized in that the sheet is made of a material including a nonwoven fabric layer having a titanium oxide content of 5% by weight or less . Said backsheet, a disposable diaper of claim 1, wherein the opacity based on JIS P 8138 is characterized by being configured of a material comprising a nonwoven layer of less than 40%. The said back sheet | seat was comprised with the raw material containing the nonwoven fabric layer whose fineness of the fiber which comprises this back sheet | seat is 1.0-5.0dt, and a fabric weight is 30 g / m < ² > or less. 1 Contact and 2 of the disposable diaper of any one claim. A top sheet positioned on the wearer side, a back sheet positioned on the anti-wearer side, and an absorbent body interposed between the two sheets, and a symbol display portion is formed on the inner surface side of the back sheet at the waist portion In the disposable diaper formed, an elastic member that contracts in the circumferential direction is disposed in the waist portion, and the elastic member is made of thread rubber having a titanium oxide content of 5% by weight or less. Disposable diapers.

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