JPH03207358A - Paper diaper and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent the lateral leakage of the moisture of urine or a loose passage by forming a barrier sheet forming a barrier cuff from a liquid impermeable sheet material and mounting an elastic entensible member to the barrier sheet to form the barrier cuff. CONSTITUTION:An absorbing body 3 composed of fluffy pulp is interposed between a liquid impermeable back sheet 1 and a hydrophilic liquid permeable sheet 2 composed of a nonwoven fabric having a width narrower than that of the liquid impermeable back sheet 1. Further, a liquid permeable top sheet 2 is provided so as to outwardly extend from the side edges of the absorbing body 3 and the deformable elastic extensible members 5 having a ship-shaped cross-sectional surface of the absorbing body are fixed between the extended parts and the back sheet 1 per a single side and the inside parts other than the fixed part of the back sheet 1 and a paper diaper become free parts unfixed to the liquid permeable sheet 2 and these free parts become the erected parts on the surface side of the paper diaper. By this constitution, the lateral leakage of a loose passage is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper diaper having barrier cuffs and a method for manufacturing the same.

[Conventional technology]

In recent years, paper diapers having barrier cuffs have been proposed, and some of them are in practical use.

This type of paper diaper attempts to prevent side leakage of loose stool with barrier cuffs.

As a typical example, JP-A-62-250201
The technique described in Japanese Patent No. 82-231004 has been proposed. In this case, it is also known to provide gasket cuffs on the outside of the barrier cuffs together with the barrier cuffs.

Although the barrier cuffs can block loose stools, the blocked stools come into direct contact with the skin, so fecal irritation is unavoidable.

Therefore, the present applicant provided a soft stool-permeable top sheet that preferably has elasticity in a portion corresponding to the central part of the private part,
It is connected to the barrier sheet on both sides, and
Barrier cuffs are made to stand up by the elastic force of the elastic member attached to them, creating a dam, which prevents loose stools from leaking sideways, and allows the wearer's skin to come into direct contact with loose stools due to the soft stool permeation effect of the top sheet in the center. I first proposed something similar to this (Patent Application No. 218026/1983).

On the other hand, Japanese Patent Application Laid-Open No. 1-162807 discloses that when forming a barrier cuff, an elastic elastic member is not fixed to a liquid-permeable sheet at the center portion in the longitudinal direction, but only at both ends in the longitudinal direction. It is disclosed that by being fixed to the sheet, during use, the disposable diaper contracts in the longitudinal direction due to the contraction force of the elastic elastic member, and the liquid-permeable sheet is relatively separated from the absorbent body to form floating cuffs. There is.

[Problem to be solved by the invention]

The main purpose of the technique disclosed in JP-A-1-162807 (hereinafter referred to as the prior example) is to allow the elastic elastic member to freely move in the width direction according to the body shape and movement of the wearer during use. The objective is to improve the fit for the wearer.

However, although this precedent is a means of improving the fit for the wearer, barrier cuffs (
In this case, no consideration has been given to the phenomenon that when the loose stool is blocked by floating cuffs, the loose stool remains on the liquid-permeable sheet, causing stool staining.

Furthermore, in the prior example, the sheet is formed from a single sheet, so it is essential that the sheet be a liquid-permeable sheet in order to absorb urine. However, when floating cuffs are formed using this liquid-permeable sheet, the liquid of urine or soft stool may leak in the lateral direction while seeping through the liquid-permeable sheet.

Furthermore, when adopting the structure of this prior example, considering the manufacturing method, it is necessary to fix the floating portion to the disposable diaper element in a floating state in advance, which poses difficulties in terms of the manufacturing method and manufacturing equipment. Moreover, the incidence of defective products increases.

In addition, the patent application No. 63-218026 filed by the present applicant
In relation to the structure of the disposable diaper, the top sheet lifts up from the liquid-permeable sheet, so the permeated soft stool stays in the space between the top sheet and the liquid-permeable sheet, and then the wearer moves and removes the diaper. When pressure is applied to the surface of the sheet, there is a tendency for soft stool to return to the surface sheet. Therefore, it is preferable that loose stool be stored on the side.

Therefore, a first object of the present invention is to provide a paper diaper that can prevent fecal rash caused by the excretion of soft stool and reliably prevent side leakage of urine or soft stool liquid.

The second object is to provide a method for manufacturing disposable diapers that allows the liquid-permeable sheet to be polymerized with other disposable diaper components in a flat state when standing up, thereby simplifying the process and reducing the incidence of defective products. It's about doing.

[Means to solve the problem]

The problem from the structural aspect of the above-mentioned disposable diaper is that an absorbent body is provided on the top surface of a liquid-impermeable sheet, a liquid-permeable sheet with at least the center portion in the width direction is liquid-permeable is placed on the top surface of this absorbent body, and In the paper diaper, the barrier sheet forming the barrier cuffs is made of a substantially different material from the liquid-permeable sheet. The barrier sheet is made of a liquid-impermeable sheet material, and elastic elastic members are attached to the barrier sheet to form barrier cuffs. A portion of the liquid-permeable sheet that is not fixed to the absorbent body is formed in the liquid-permeable sheet, and a widthwise intermediate portion of the non-fixed portion of the liquid-permeable sheet is formed on the inner surface of the upright portion of the barrier sheet that occurs when the elastic elastic member is attached. This can be solved by fixing along the longitudinal direction and forming slits along the longitudinal direction on both sides of the non-fixed portion bordering on the fixing line.

In addition, the issue from the perspective of the manufacturing method is to manufacture a disposable diaper in which an absorbent body is provided on the top surface of a liquid-impermeable sheet, and a liquid-permeable sheet with at least a central portion in the width direction that is liquid-permeable is placed on the top surface of this absorbent body. In doing so, there is a step of forming in advance slits along the longitudinal direction of the disposable diaper on both sides of at least the tops of the upright portions on both sides of the liquid-permeable sheet, and another step of polymerizing the liquid-permeable sheet in a substantially planar state. During the polymerization of the parentheses, superimposed on the disposable diaper element,
This can be solved by including the following steps: fixing the raised portion to other disposable diaper elements except for the raised portion; and providing an elastic stretchable member that contracts the top of the raised portion in the longitudinal direction when worn.

[Effect]

In the first aspect of the present invention, the barrier sheet forming the barrier cuff is made of a liquid-impermeable sheet material different from the liquid-permeable sheet, and an elastic elastic member is further attached to the barrier sheet to form the barrier cuff. ing.

As a result, the presence of the barrier cuffs reliably prevents side leakage of urine and soft stool water.

Further, the liquid-permeable sheet is arranged on the inner side of the barrier cuffs, and the liquid-permeable sheet has portions that are not fixed to the absorbent body on both sides of the disposable diaper, and the elastic elastic member of the barrier sheet The middle part in the width direction of the non-fixed part of the liquid-permeable sheet is fixed along the longitudinal direction on the inner surface of the upright part accompanying the attachment of the sheet, and slits are formed along the longitudinal direction on both sides of the non-fixed part bordering on this fixing line. each formed. As a result, when the elastic elastic member of the barrier sheet contracts during use, the barrier cuffs stand up, and since the liquid-permeable sheet has slits, the slits open when the barrier cuffs stand up. However, the liquid-permeable sheet stands up at the same time.

In this way, a mountain of liquid permeable sheet is formed inside the barrier cuff. When soft stool is discharged between the left and right mountains, the soft stool enters the mountain through the through hole formed by the opening of the slit. Therefore, loose stools do not remain on the surface of the liquid-permeable sheet, and stool staining is prevented.

On the other hand, the outer wall of the pile and the standing wall of the barrier cuff form a double barrier against the solid content of loose stool that has entered the inside of the pile of the liquid-permeable sheet, so it is effective in preventing side leakage. expensive.

On the other hand, according to the preceding example, in order to form floating cuffs, it is necessary to use a liquid-permeable floating sheet with sufficient width in advance when manufacturing a disposable diaper, and it is necessary to assemble the floating cuffs while standing up the standing parts. Since a means for this purpose is required, manufacturing equipment becomes complicated and the incidence of defective products increases.

On the other hand, according to the method of the present invention, slits are formed along the longitudinal direction of the disposable diaper at least on both sides of the top of the upright portion on both sides of the liquid-permeable sheet. Even if they overlap in a flat state, when the top equivalent line of the standing portion contracts due to the contractile force of the elastic elastic member when worn, the slit opens and stands up with the corresponding line as the top. Therefore, being able to assemble a paper diaper by simply polymerizing a liquid-permeable sheet in a flat state simplifies manufacturing equipment and prevents an increase in the incidence of defective products. Moreover, at the same time, by opening the slits, it is possible to manufacture a structurally good paper diaper as described above.

〔Example〕

Hereinafter, the present invention will be explained in more detail by way of examples with reference to the drawings.

In the disposable diaper of the present invention, a liquid-impermeable backsheet 1 made of polyethylene or the like and a hydrophilic and liquid-permeable topsheet 2 made of a nonwoven fabric or the like narrower than the liquid-impermeable backsheet 1 are provided. For example, an hourglass-shaped absorbent body 3 having a certain degree of rigidity is interposed, which is made of a cotton-like bulb or the like.

The absorbent body 3 has a lip groove type with an opening on the top surface to maintain its shape (Fig. 2 shows the structure in the middle part in the longitudinal direction, so the side edges are discontinuous due to cutting to obtain the hourglass shape of the absorbent body 3). It is wrapped in crepe paper 4 of

Further, the liquid-permeable top sheet 2 extends outward from the side edge of the absorbent body 3, and between the extending portion and the back sheet l, an absorbent body made of, for example, two rubber threads is provided on one side. 3 is fixed with a hot melt adhesive or the like (in each figure, the portion fixed by the hot melt adhesive is indicated by an X mark).

On the other hand, a barrier sheet 6.6 made of a water-repellent nonwoven fabric is provided on the front side of the disposable diaper, and the back sheet 1 and the paper diaper are fixed to each other with hot melt adhesive on both sides, and the inside part other than the fixed part is is also a free portion that is not fixed to the liquid-permeable sheet 2, and this free portion is a standing portion that stands up on the surface side of the paper diaper.

In an appropriate number of embodiments, three elastic elastic members 7 for barrier cuffs per side are fixed to the inner side of this free portion in a stretched state along the longitudinal direction by hot melt, adhesive, or the like.

Further, the widthwise intermediate portion of the liquid-permeable sheet 2 is fixed to the crepe paper 4 with a hot melt adhesive, and as a result, it is fixed to the absorbent body 3.

Thus, the portions of the liquid-permeable sheet 2 other than the fixed portions AI and A2 are non-fixed portions F. Further, a widthwise intermediate portion of this unfixed portion F is fixed to the inner surface near the top of the free standing portion of the barrier sheet 6 with a hot melt adhesive H. Furthermore, slits 8A are formed along the longitudinal direction on both sides of the fixing line formed by the hot melt adhesive H, in a staggered arrangement, for example.

In the paper diaper configured in this way, when the elastic elastic member 7 contracts when worn, the barrier sheet 6
The free standing part of the barrier cuff B stands up as shown in Figure 2.
is formed. With this standing up, a lifting force acts on the non-fixed portion F of the liquid-permeable sheet 2 since the liquid-permeable sheet 2 is fixed to the barrier sheet 6 . As a result, as shown in FIG. 4, the slit 8A opens, thereby forming the through hole 8B for soft stool, and the non-fixed portion F stands up in a mountain shape, forming a pocket space P for stool inside. .

In this state, when urine is urinated between the barrier cuffs BSB, the urine is absorbed into the absorbent body 3 through the liquid permeable sheet 2. Furthermore, during defecation, the liquid of loose stool excreted between the barrier cuffs 8, 8 is similarly absorbed. The solid content of loose stool mainly enters the pocket space P through the permeation holes 8B of the liquid-permeable sheet 2. In this way, since the loose stool itself passes through the liquid-permeable sheet 2, its solid content does not remain on the liquid-permeable sheet 2 between the non-fixed portions F and F of the liquid-permeable sheet 2, thereby preventing stool rash. Prevented.

In addition, if the solid content of loose stool that has entered the pocket space P moves outward in the width direction due to the movement of the wearer, since there is an outer wall of the non-fixed part F, it is actually likely that the solid content of loose stool will move outward from that outer wall. is prevented.

Even if leakage were to occur through the slit opening in the outer wall, the barrier cuffs 81B contact the wearer's chest in an upright position, so the barrier cuffs B act as a barrier to prevent leakage in the width direction.

In this way, in the disposable diaper structure of the present invention, the non-fixed portion F is
Since a double barrier is formed by the outer wall of and the barrier cuff B, side leakage is reliably prevented. In addition, the barrier cuff B has the effect of preventing side leakage of liquid once absorbed.

In the paper diaper structure of the present invention, the barrier cuffs B are made to stand up at a predetermined position, which has the effect of determining the position in the width direction.

That is, as shown in FIG. 8, it is possible to fix the side part of the liquid-permeable sheet 2 to the inner surface of the barrier sheet 6, but in this case, as shown in the same figure, the side part of the liquid permeable sheet 2 is fixed to the inner surface of the barrier sheet 6. When a falling force is applied due to the movement of the wearer on the inside, the standing portions of the barrier cuffs B and the liquid-permeable sheet 2 fall down inward, and as a result of the difference in the widthwise position of the barrier cuffs B, the barrier cuffs B , B becomes narrower, thereby narrowing the width of the effective area for excretion, impeding excretion, and lowering the standing height of the barrier cuff B, causing side leakage. On the other hand, in the disposable diaper structure of the present invention shown in FIG. 9, even if a falling force similarly acts, since the left side wall in FIG. 9 exists, the left side wall resists the falling force. This will prevent it from falling over. Of course, when an outward force is applied,
The right side wall will now resist the falling force.

In the present invention, the liquid-permeable sheet 2 does not need to be liquid-permeable in the entire width direction, but may be liquid-permeable at least in the middle in the width direction, so that urine can pass therethrough. Therefore, the entire non-fixed portion F or only the outer wall portion of the non-fixed portion F can be made liquid-impermeable.

In this case, a non-woven fabric is preferably used as the liquid-permeable sheet 2 from the viewpoint of tactility, and therefore the non-woven fabric can be treated with water repellent treatment using silicone or the like to make it liquid-impermeable.

Further, the material of the liquid-permeable sheet 2 may be non-liquid-permeable, or it may be made liquid-permeable by forming a large number of through holes.

In view of its function, the above-mentioned soft stool through holes 8B preferably have a large number of through holes that allow the solid content of soft stool to pass through. In this case, at least the aperture ratio after the opening of the through hole is preferably 50% or more per area where the through hole is formed. Furthermore, the slits referred to in the present invention may be formed not only by a straight line, but also by a curved line or a cut line in the shape of a "<" character. Furthermore, as long as the slit is along the longitudinal direction of the disposable diaper, it may be a rectangular or rectangular slit with a certain width. It can also be an ellipse.

The shape of the hole after the slit is opened is round,
Any suitable shape may be used, such as triangular, square, or rhombic (approximately rhombic in actual practice), and the diameter of one through hole is 3 to 100 m.
More preferably, it is the rule of 7 to 50, and the opening area of one through hole is preferably 7 to 3000 m''.

On the other hand, the slits are arranged on the left and right sides of the line fixed to the inner surface of the barrier sheet 6, as shown in
In addition to being the same, an appropriate configuration may be adopted, such as making the outer wall longer as shown in FIG. 5, or making the inner wall longer as shown in FIG.

Further, in the above embodiment, the top sheet is formed of -2 liquid-permeable sheets 2, but a plurality of liquid-permeable sheets may be stacked or connected in the width direction.

On the other hand, in the above example, the outer portion of the barrier sheet 6 in the width direction is fixed to the back sheet l, but the top sheet 2 is extended further outward in the width direction than the illustrated example, and the outer portion of the barrier sheet 6 is fixed to the back sheet l. Alternatively, the barrier sheet 6 can be fixed to the top sheet 2 by using a hot melt adhesive, or by shortening the width of the barrier sheet 6.

By the way, in the prior art example, the elastic stretchable member is not fixed to the barrier sheet except for both ends in the longitudinal direction. However, if the soft stool through hole 8B is formed as described above to prevent stool rash, if the 70-ting structure of the previous example is applied as is, after wearing and defecating, as shown in FIG. When the elastic elastic member moves due to the movement of the wearer and comes to be located at the through-hole 8B position, the loose stool that has entered will adhere to the elastic elastic member and come into contact with the wearer's skin through the through-hole 8B. , the advantage of taking painstaking measures to prevent stool rash is lost.

Moreover, when the elastic stretchable member 10 moves in the width direction, the standing height of the floating cuff decreases, and the effect of preventing side leakage of loose stool decreases.

On the other hand, in the above example, the position of the non-fixed portion F is determined by fixing it to the inner surface of the barrier sheet 6, so the above problem is solved.

On the other hand, when adopting the structure of the prior example, considering the manufacturing method, it is necessary to fix the floating portion to the disposable diaper element in a floating state in advance, which poses difficulties in terms of the manufacturing method and manufacturing equipment.

Moreover, the incidence of defective products increases.

On the other hand, if a slit is formed in advance in the part that becomes the non-fixed part F as in the present invention, it is not necessary to fix the upright part to the disposable diaper element in a floating state in advance, as in the previous example. Since the liquid-permeable sheet 2 can be manufactured by polymerizing other disposable diaper elements while supplying the liquid-permeable sheet 2 in a flat state, the manufacturing process is extremely easy and the incidence of defective products can be reduced.

For example, the desired paper diaper product can be obtained through the following steps.

That is, as shown in FIG. 11, the liquid-permeable sheet 2X is supplied from one side, and the barrier sheet 6X and the elastic elastic member 7 are supplied from the other side, and the barrier sheet 6X is transferred to the slitter. 11 at the center in the width direction, and divides it into left and right parts as shown in FIG. 12A, and fixes three elastic elastic members 7 on each side to the divided barrier sheet 6Y using a hot melt coating gun 12. At the same time, as shown in FIG. 12B, the top of the barrier cuff B is processed. On the other hand, after forming slits 8A on the original fabric 2X of the liquid-permeable sheet using the slitter 13 as shown in FIG. Apply hot melt adhesive to the top and both sides of the non-fixed parts F, F.

Next, after the liquid-permeable sheet 2 and the barrier sheet 6.6 are polymerized by the polymerization roll 15, as shown in FIG. Apply adhesive. Thereafter, the liquid-permeable sheet 2 to which the barrier sheet 6.6 has been attached in advance is fed in a flat state to other disposable diaper components such as the absorbent body 3, which are continuously fed at intervals by the conveyor 17. , and are assembled by polymerization using an assembly polymerization roll 18.

When the wearer is informed of the product obtained through this process,
As shown in FIG. 2, as the group of elastic elastic members 7 contract, the non-fixed portions F, F of the liquid-permeable sheet 2 stand up at their centers.

FIG. 7 shows an embodiment of the second disposable diaper structure.

In this example, the elastic elastic member 70 is fixed to the non-fixed part F,
This is an example in which a first barrier cuff Bl is formed, and a second barrier cuff B2 made of a separate barrier sheet 6 is formed on the outside thereof.

In this second embodiment as well, the first
The same effects as in the example are brought about.

Further, the manufacturing method of the present invention can be similarly adopted.

〔Effect of the invention〕

As described above, according to the paper diaper structure of the present invention, it is possible to prevent fecal rash caused by the excretion of soft stool, and it is also possible to reliably prevent side leakage of urine or soft stool liquid.

On the other hand, the manufacturing method of the present invention provides advantages such as ease of manufacturing.

[Brief explanation of drawings]

FIG. 1 is a plan view of the disposable diaper according to the present invention in an unfolded state;
The figure is an arrow view showing the upright state of the liquid-permeable sheet when worn at the ■-■ line position, Figure 3 is a partial plan view of an example of slit formation in the liquid-permeable sheet, and Figure 4 is a partial perspective view of the disposable diaper. figure,
5 and 6 are plan views of other examples of slit formation, FIG. 7 is a vertical sectional view of another example of the structure of a disposable diaper, FIG. 8 is a schematic diagram of a reference example, and FIG. 9 is a summary of an example of the present invention. Sectional longitudinal sectional view, No. 1.0
11 is a schematic diagram of an example of a manufacturing method, and FIGS. 12A to 12E are explanatory diagrams at positions corresponding to those in FIG. 11. DESCRIPTION OF SYMBOLS 1... Liquid-impermeable back sheet, 2... Liquid-permeable (top) sheet, 3... Absorber, 6... Barrier sheet, 7.70... Elastic stretch member, 8A... ·slit,
8B...Transmission hole, B, Bl, B2...Barrier cuff, P...Pocket space. Figure 1 Figure Figure 5 Figure Figure Figure Figure 0

Claims (2)

[Claims] (1) An absorbent body is provided on the top surface of the liquid-impermeable sheet, and a liquid-permeable sheet with at least the center portion in the width direction is liquid-permeable is placed on the top surface of this absorbent body, and the surface of the disposable diaper is further disposed along the front-rear direction. In a disposable diaper having barrier cuffs on both sides having elasticity and stretchability that protrude from the crocodile, the barrier sheet forming the barrier cuffs is made of a substantially liquid-impermeable sheet material different from the liquid-permeable sheet; Furthermore, an elastic elastic member is attached to the barrier sheet to form a barrier cuff, and
The liquid-permeable sheet is arranged on the inner side of the barrier cuff, and a portion of the liquid-permeable sheet that is not fixed to the absorbent body is formed on both sides of the disposable diaper, and an elastic elastic member of the barrier sheet is attached. The middle part in the width direction of the non-fixed part of the liquid-permeable sheet is fixed along the longitudinal direction on the inner surface of the rising part, and slits are formed along the longitudinal direction on both sides of the non-fixed part with this fixing line as a border. A disposable diaper characterized by: (2) In manufacturing a paper diaper in which an absorbent body is provided on the upper surface of a liquid-impermeable sheet, and a liquid-permeable sheet whose widthwise central portion is liquid-permeable is arranged on the upper surface of this absorbent body, the above-mentioned liquid permeability is determined in advance. forming slits along the longitudinal direction of the disposable diaper on both sides of at least the tops of the upright portions on both sides of the sheet; overlapping the liquid-permeable sheet with other disposable diaper elements to be polymerized in a substantially planar state; During this polymerization,
Manufacturing a paper diaper characterized by comprising the steps of: fixing the standing portion to other disposable diaper elements except for the standing portion; and providing an elastic stretchable member that contracts the top of the standing portion in the longitudinal direction when worn. Method.