JP2014147450A - Method for manufacturing disposable diaper and disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a degree of design freedom of an inner-body outer sheet.SOLUTION: A disposable diaper includes: a belly-side outer sheet 12F; a back-side outer sheet 12B; an inner body 200 provided thereover and incorporating an absorber 56 for absorbing excreta, where the belly-side outer sheet 12F and the back-side outer sheet 12B are not connected at a crotch side; and an inner-body outer sheet 12M for covering the back face of the inner body 200 at least in a separation area. When the disposable diaper is manufactured, a prescribed width of belt-like outer sheet 12 material 12S is divided into three, two of them are used for forming a part to become the belly-side outer sheet 12F and a part to become the back-side outer sheet 12B, and the residual one is used for a part to become the inner-body outer sheet 12M. The part to become the inner-body outer sheet 12M is cut at prescribed intervals apart to form individual inner-body outer sheets 12M, and then, the individual inner-body outer sheets 12M are intermittently stuck to the back side of the part to become the inner body 200.

Description

  The present invention relates to a method for manufacturing a disposable diaper and a disposable diaper.

  As a manufacturing method of disposable diapers, in particular, pants-type disposable diapers, a lateral flow configuration in which the width direction of the diaper is a line flow direction is widely adopted, and as shown in FIG. The exterior sheet and the interior body having the absorbent body are manufactured in separate lines, and the steps after the integration process of the exterior sheet and the interior body are configured as one line.

  More specifically, in FIG. 1, the plan view of the upper part shows the main line including the production of the exterior sheet, the plan view of the middle part shows the production line of the interior body, and the front view of the lower part Shows the entire manufacturing flow. The main line includes an exterior sheet forming step 501, an elastic elastic member cutting step 502, a leg opening separation step 503, an interior body attaching step 504, a side joining step 505, and a separation step 506. First, in the exterior sheet forming step 501, the continuous belt-like outer sheet material 12S and inner sheet material 12H are unwound from each roll, and elastic elastic members 15, 17-19 such as thread rubber are conveyed between the sheet materials 12S, 12H. The outer sheet 12 is continuously formed by sequentially bonding the two sheet materials 12S and 12H with a hot-melt adhesive or the like while sandwiching them in a stretched state along the direction (the waistline direction).

  Next, in the elastic expansion / contraction member cutting step 502, the elastic expansion / contraction members 15 and 19 that are located in the portion CT that overlaps the interior body 200 later are cut by the cutting device 601 such as heat embossing on the formed continuous exterior sheet 12. In the part CT, the elastic force of the elastic elastic members 15 and 19 is not applied. Further, in the next leg opening separation step 503, a portion that becomes a leg opening of the diaper adjacent in the continuous direction (conveying direction (MD direction)) is formed as an integrated hole HL by a cutting device such as a die cutter 602. Punching and separating from the main part, which is the part that becomes the diaper.

  On the other hand, in the production line for the interior body, the continuous belt-like liquid-impermeable sheet 11 is fed out, and the absorbent body 56 and the liquid-permeable top sheet 30 are laminated in this order, and both sides of the top sheet 30 are liquid-impermeable. The sheet is wound around the back side of the adhesive sheet 11 and fixed with a hot melt adhesive or the like. Next, to each side of the CD direction (line crossing direction), a belt-shaped three-dimensional gather band 60 fixed in a state where the elastic member 63 extends in the MD direction is supplied to the CD direction center side end of the material, respectively. The outer portion of each three-dimensional gather band 60 in the CD direction is further wound around the back side of the top sheet and fixed with a hot melt adhesive or the like, and the central portion in the CD direction is the MD direction on the front side of the portion to be an individual interior body. It fixes to the side part of the top sheet 30 with a hot melt adhesive etc. at both ends. After that, the interior body cutting device 603 is cut at a predetermined interval in the MD direction to form individual interior bodies 200, and the orientation of the interior body 200 is rotated so that the front-rear direction is the CD direction. After that, the sheet is supplied to the main body interior body attaching step 504 and attached to a predetermined portion on the continuous strip-shaped exterior sheet 12 that is sequentially conveyed with a hot melt adhesive or the like at a predetermined interval in the MD direction.

  Next, in the side part joining step 505, one side in the CD direction is folded to the other side, the abdomen part and the back part are overlapped, and joined by a joining device 604 such as heat seal at a predetermined interval in the MD direction. Processing is performed, and the abdominal portion and the back portion are joined to each other in the portion 12A which is the both sides in the width direction of each diaper DP. After that, in the final detaching step 506, in the diaper separating device 605, with a predetermined interval in the MD direction, the boundary between the parts that become individual diapers (the joint part 12A of one diaper among the parts that become adjacent diapers) Are cut between the other diaper joints 12A) to obtain individual diapers.

  However, this manufacturing method has a problem that the material use efficiency is low because the punched portion becomes a trim (a cut piece to be discarded) in the step 503 for cutting the leg opening.

  On the other hand, as shown in FIG. 2, in the exterior sheet 12 forming process 501, the abdomen exterior sheet 12 </ b> F and the back exterior sheet 12 </ b> B are formed in parallel at intervals in the CD direction, and in the interior body 200 attachment process 504. By fixing the interior body 200 so as to extend from the ventral side exterior sheet 12F to the back side exterior sheet 12B, it is surrounded by the lower edge of the abdominal side exterior sheet 12F and the back side exterior sheet 12B and the side edge of the interior body 200. Disposable diapers having leg openings can be manufactured. The thing of patent document 1 is also substantially the same as this. In this case, the front-rear direction intermediate region of the interior body 200 is not covered with the ventral exterior sheet 12F and the back exterior sheet 12B. It is necessary to affix an exterior sheet (hereinafter referred to as an interior body exterior sheet 12M). Therefore, although the disposable diaper having the exterior two-part structure has a high trim reduction effect, it is necessary to prepare the exterior sheet 12M for the interior body separately, and the number of materials increases (in association with this, the material cost also increases). In addition, complication of material management cannot be avoided.

  On the other hand, the thing of patent document 2 is excellent in the point which can eliminate the increase in the number of materials and complication of material management, aiming at trim reduction.

Table 2004-054490 JP 2010-51667 A

  However, since the thing of the said patent document 2 forms an interior body on the line of an exterior sheet formation process, the dimension shape of the exterior sheet for interior bodies becomes completely the same as the dimension shape of an interior body. There is a problem that the degree of freedom in designing the exterior sheet for interior bodies is low.

  In particular, in the case of the one manufactured by the method described in Patent Document 2, in the region where the interior body overlaps with the abdominal exterior sheet and the back exterior sheet, the back surface of the interior body is covered with the abdominal exterior sheet and the back exterior sheet. Therefore, when it is intended to cover the back surface of the interior body, it is not necessary to provide an exterior sheet for the interior body in this region, and when it is provided, there is a possibility that the air permeability may be lowered or hardened. For this reason, although it is desirable to make the full length of the exterior body exterior sheet shorter than the interior body, this is not possible with the method described in Patent Document 2.

  Then, the main subject of this invention is improving the freedom degree of design of the exterior sheet for interior bodies.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
Built-in abdominal exterior sheet, back exterior sheet, and absorbent body that absorbs excrement provided from the center in the width direction of the inner surface of the abdominal exterior sheet to the center in the width direction of the inner surface of the back exterior sheet And an interior body to
The manufacturing method of the disposable diaper provided with the exterior sheet for interior bodies which the above-mentioned abdominal side exterior sheet and back side exterior sheet are not separated on the crotch side, are separated, and at least cover the back of the interior body in this separation area Because
A belt-shaped exterior sheet material having a predetermined width is divided into three in the CD direction while being conveyed along the continuous direction, and a part to be a ventral exterior sheet and a part to be a back exterior sheet are formed using two of them, The remaining one is the part that becomes the exterior sheet for the interior body,
After cutting the portion to be the exterior sheet for the interior body at a predetermined interval in the MD direction to form individual exterior sheets for the interior body,
After pasting the exterior sheet for the interior body on the back surface of the part to be separately manufactured, the interior body is cut at a predetermined interval in the MD direction to form individual interior bodies, and then the interior body Is attached at a predetermined interval in the MD direction so as to cover the portion that becomes the ventral exterior sheet and the portion that becomes the dorsal exterior sheet that flows at an interval in the CD direction,
After that, by cutting the part to be the ventral exterior sheet and the part to be the back exterior sheet at the boundary of each diaper, to obtain individual diapers,
The manufacturing method of the disposable diaper characterized by the above-mentioned.

(Function and effect)
In the production method of the present invention, the strip-shaped exterior sheet material is first divided into three parts to form interior exterior sheet parts, which are cut at predetermined intervals in the MD direction, for individual interior bodies. After forming the exterior sheet, the individualized exterior sheet for an interior body is attached to the back surface of the part that is to be manufactured separately. Therefore, the overall length of the exterior sheet for interior body can be made shorter or longer than the interior body by appropriately changing the cutting interval at the time of individualized cutting of the exterior sheet for interior body, and the exterior sheet By appropriately changing the width at the time of dividing the material into three and the shape of the dividing line, the width and the side edge shape of the exterior sheet for the interior body can be changed, and the degree of design freedom is improved.

  Moreover, in the manufacturing method of the present invention, in order to obtain the above characteristic process, the abdomen exterior sheet and the dorsal exterior sheet are divided, and a portion between them is used as a leg opening. By trimming the leg openings, trim that has occurred can be eliminated, and material loss (hereinafter also referred to as trim loss) can be suppressed.

  On the other hand, in a pants-type disposable diaper, an elastic member is generally attached to the exterior sheet in the width direction of the diaper in order to tighten the waistline, and on the other hand, the interior body is prevented from leaking. Generally, an elastic member is attached as a constituent member of a three-dimensional gather for stretching in the front-rear direction. In this case, since the mounting direction of the elastic member is preferably the MD direction (conveying direction) of the production line, the exterior sheet production line is a lateral flow, the interior body production line is a longitudinal flow, and the lateral flow exterior sheet. A manufacturing method in which an absorbent pad manufactured in a longitudinal flow is attached to a line by changing its direction is common. On the other hand, also in the said invention, the production line of an exterior sheet becomes a horizontal flow, and the production line of an interior body becomes a vertical flow. Therefore, in the present invention, there is an advantage that the manufacturing principle that has been generally used can be applied as it is.

<Invention of Claim 2>
In forming the individual exterior body exterior sheet, the portion serving as the interior body exterior sheet is shorter in the MD direction than the overall length of the interior body and from the spacing between the ventral exterior sheet and the back exterior sheet. The manufacturing method of the disposable diaper of Claim 1 cut | disconnected at a long predetermined space | interval.

(Function and effect)
In the disposable diaper manufactured according to the present invention, in the region where the interior body overlaps with the abdominal exterior sheet and the back exterior sheet, the back surface of the interior body is covered with the abdominal exterior sheet and the back exterior sheet. When the purpose is to cover the back surface, it is not necessary to provide an exterior sheet for the interior body in this region, and if it is provided, there is a possibility that air permeability may be lowered or hardened. In the present invention, since the overall length of the interior body exterior sheet can be freely changed, as described above, the overall length of the interior body exterior sheet is shorter than the overall length of the interior body and the abdominal exterior sheet and the back exterior sheet are separated from each other. It is preferable to make it longer than the interval.

<Invention of Claim 3>
The manufacturing method of the disposable diaper of Claim 1 or 2 whose width | variety of the part used as the said exterior sheet for interior bodies is narrower than the width | variety of the said interior body.

(Function and effect)
As described above, in the present invention, the width of the exterior sheet material at the time of being divided into three can be changed as appropriate, so that the width of the portion to be the exterior sheet for the interior body is designed to be narrower than the width of the interior body Can do. As a result, the side edge of the exterior sheet for the interior body is separated from the side edge of the interior body toward the center in the width direction, and therefore, when the side edge of the interior body and the leg are rubbed, the side edge of the exterior sheet for the interior body is skinned. There will be no irritation. In addition, when an exterior sheet for an interior body is attached, the interior body becomes hard due to the influence of the adhesive means (for example, adhesive), but the side edge of the interior body exterior sheet is centered in the width direction from the side edge of the interior body. If it is spaced apart to the side, the side part of the interior body can be flexibly brought into contact with the leg without being hardened.

<Invention of Claim 4>
The exterior sheet material is divided into three parts, the middle part in the CD direction is used as the exterior sheet for the interior body, and the abdomen side exterior sheet is formed using the part on the one side in the CD direction and the part on the other side in the CD direction. While forming the part and the part to be the back side exterior sheet,
At the time of the three divisions, the dividing line for the three divisions is continuously or stepwise outward in the CD direction from the middle in the MD direction toward the both ends in the MD direction in the part that becomes the exterior sheet for the interior body of the individual interior body. A curve that comes to be located,
The manufacturing method of the disposable diaper of any one of Claims 1-3.

(Function and effect)
When the dividing line is linear in the MD direction, the disposable diaper produced has little material loss, but the angle between the interior body and exterior sheet around the legs is close to 90 °, which is structurally continuous. Since this is not done, there is a problem in fit, and there is a problem that a gap is formed between the body and leakage of urine and feces is likely to occur. On the other hand, in the present invention, the width of the exterior sheet material at the time of three divisions can be changed as appropriate, so by dividing the curved sheet pattern as described above, the ventral exterior sheet and the back exterior sheet The lower edge and both side edges of the exterior body exterior sheet are shaped to easily fit around the legs. In other words, the lower edge of the abdominal exterior sheet is along the buttock, and the lower edge of the back exterior sheet is along the ridge groove, each having a curved shape that is positioned on the waist side toward the both sides in the width direction. Can do. Moreover, the exterior sheet for the interior body has a shape in which the front intermediate portion is constricted in the width direction and is formed along the leg crotch, so that the side edge of the exterior sheet for the interior body is difficult to touch the skin, and the interior body side In particular, the portion that comes into contact with the leg does not become hard and comes into contact with the leg flexibly.

<Invention of Claim 5>
The manufacturing method of the disposable diaper according to claim 4, wherein the absorbent body has a shape in which a front intermediate portion is constricted in a width direction, and the interior body is rectangular.

(Function and effect)
In many disposable diapers, the inner body has a rectangular shape, whereas the absorbent body has a shape in which the intermediate portion in the front-rear direction is bound in the width direction so as to follow the curved surface around the legs. In such a form, the side edge portion of the interior body is left in the constricted portion of the absorber, but this surplus portion is hardened by the exterior sheet for interior body, or the exterior sheet for interior body is located closer to the outside of the surplus portion. If the side edge is positioned, there is a possibility that the feeling of wearing improved by making the absorbent body into a constricted shape may be deteriorated. Therefore, especially in such a case, it is preferable that the front-rear direction intermediate portion of the exterior sheet for interior body is constricted as described above.

<Invention of Claim 6>
Built-in abdominal exterior sheet, back exterior sheet, and absorbent body that absorbs excrement provided from the center in the width direction of the inner surface of the abdominal exterior sheet to the center in the width direction of the inner surface of the back exterior sheet And an interior body to
In the disposable diaper provided with the exterior sheet for the interior body that covers the back side of the interior body in at least this separation region, and the abdomen exterior sheet and the back exterior sheet are not continuous on the crotch side and are separated from each other,
The material of the ventral side exterior sheet and the back side exterior sheet is the same as the material of the exterior body exterior sheet,
The width of the exterior sheet for the interior body is narrower than the width of the interior body,
The lower edge of the belly side exterior sheet is shaped to coincide with one side edge of the exterior body exterior sheet, and the lower edge of the back side exterior sheet coincides with the other side edge of the interior body exterior sheet. Yes,
A disposable diaper characterized by that.

(Function and effect)
The same effects as those of the third aspect of the invention can be achieved.

<Invention of Claim 7>
The lower edge of the abdominal exterior sheet and the lower edge of the back exterior sheet are in a curved shape located on the waist side toward the both sides in the width direction, respectively.
The disposable diaper according to claim 6, wherein the exterior sheet for an interior body has a shape in which a front intermediate portion is constricted in a width direction.

(Function and effect)
The same effects as those of the invention of the fourth aspect are achieved.

<Invention of Claim 8>
The disposable diaper according to claim 7, wherein the absorbent body has a shape in which a front intermediate portion is constricted in the width direction, and the interior body is rectangular.

(Function and effect)
The same effects as those of the invention of claim 5 are achieved.

  As described above, according to the present invention, there are advantages that the degree of freedom in designing the exterior sheet for interior bodies is improved.

It is the schematic which shows the conventional manufacturing flow. It is the schematic which shows the conventional manufacturing flow. It is the schematic which shows a manufacturing flow. It is a top view in the state where the diaper was developed showing the inside of a pants type disposable diaper. FIG. 4 is a sectional view taken along line 4-4 of FIG. It is a front view of the development state of a product. It is a rear view of the unfolded state of a product. It is the schematic which shows a manufacturing flow. It is a front view of the development state of a product. It is a rear view of the unfolded state of a product. It is a front view of the development state of a product. It is a rear view of the unfolded state of a product. It is the schematic which shows the manufacturing flow of the principal part. It is a schematic plan view which shows the application pattern of a hot-melt-adhesive.

Hereinafter, embodiments of the present invention will be described in detail.
<First form>
FIG. 3 shows the first embodiment, in which the plan view of the upper part shows the main line including the manufacture of the exterior sheets 12F and 12B, and the plan view of the middle part shows the interior body that manufactures the interior body 200. The front view of the lower part shows the entire manufacturing flow. The main line includes an exterior sheet material dividing step 510, an exterior sheet forming step 501, an arrangement adjusting step 513, an elastic elastic member cutting step 502, an interior body attaching step 504, a side joining step 505, and a separating step 506. Yes.

  First, in the exterior sheet material dividing step 510, a continuous strip-shaped outer sheet material 12S having a width approximately the same as the overall length of the diaper is fed out and divided along the CD direction by the three-division slitter 600 while being conveyed along the continuous direction. Are left as they are on the main line as portions to be the ventral and back side exterior sheets 12F and 12B, and the remaining one is transferred from the main line to the interior body production line as a portion to be the exterior sheet 12M for interior bodies. . In the illustrated example, the object to be divided into three is the outer exterior sheet 12S, but an inner exterior sheet 12H described later may be divided into three, and two outer exterior sheets may be supplied in the same manner as the inner exterior sheet 12H described later. Also, in the illustrated example, the middle part in the CD direction of the outer sheet material after being divided into three parts is the part that becomes the exterior sheet 12M for the interior body, and the abdomen and The back side exterior sheets 12F and 12B are respectively formed, but the one side part in the CD direction or the other side part in the CD direction is the part that becomes the exterior sheet 12M for the interior body, and the rest are the stomach side and the back side. It is good also as a part used as the exterior sheets 12F and 12B.

  Next, in the exterior sheet forming step 501, continuous belt-shaped inner sheet material 12H is supplied to the two outer sheet materials 12S, and elastic elastic members 15, 17˜ such as thread rubber between the sheet materials 12S, 12H. While sandwiching 19 in a state of being stretched along the conveying direction (the waistline direction), the sheet material 12S and 12H are sequentially bonded together with a hot melt adhesive or the like so that the portions that become the ventral and back exterior sheets 12F and 12B are attached. Each is formed continuously.

  Next, in the elastic expansion / contraction member cutting step 502, the elastic expansion / contraction members 15 and 19 that are located in the portion CT that overlaps the interior body 200 later are cut by the cutting device 601 such as heat embossing on the formed continuous exterior sheet 12. In the part CT, the elastic force of the elastic elastic members 15 and 19 is not applied.

  In the main line, if necessary, prior to the subsequent interior body attaching step 504, the portions to be the abdominal and back exterior sheets 12F and 12B are attached to the interior body 200 described later according to the overall length of the diaper. After the CD direction interval is adjusted by the arrangement adjusting process 513 so as to meet the above, the interior body attaching process 504 is supplied. Even if such an arrangement adjustment is not performed, the arrangement in the CD direction interval of the portions to be the abdominal and dorsal exterior sheets 12F, 12B after the three divisions is suitable for the attachment position with respect to the interior body 200. The adjustment step 513 may be omitted and the CD direction interval may be maintained.

  On the other hand, in the production line for the interior body, the continuous band-shaped liquid-impermeable sheet 11 is fed out, and the absorbent body 56 and the liquid-permeable top sheet 30 are laminated in this order, and both sides of the top sheet 30 are liquid-impermeable. The sheet is wound around the back side of the adhesive sheet 11 and fixed with a hot melt adhesive or the like. Next, to each side of the CD direction (line crossing direction), a belt-shaped three-dimensional gather band 60 fixed in a state where the elastic member 63 extends in the MD direction is supplied to the CD direction center side end of the material, respectively. The outer portion of each three-dimensional gather band 60 in the CD direction is further wound around the back side of the top sheet and fixed with a hot melt adhesive or the like, and the central portion in the CD direction is the MD direction on the front side of the portion to be an individual interior body. It fixes to the side part of the top sheet 30 with a hot melt adhesive etc. at both ends.

  Next, a portion to be the exterior sheet 12M for the interior body supplied from the three-division slitter 600 of the main line is set to a predetermined MD direction interval (as described later, shorter than the entire length of the interior body 200 and The liquid-impermeable sheet 11 and the three-dimensional gathers in a portion that becomes an interior body 200 with a predetermined interval being intermittently cut at a distance longer than the separation interval between the side exterior sheet 12F and the back exterior sheet 12B) Supplied to the back side of 60 band 60 and affixed intermittently. More specifically, as shown in FIG. 13, the slip cutter device 606 includes a vacuum roll 661 that guides the portion that becomes the exterior sheet 12 </ b> M for the interior body to the back side of the portion that becomes the interior body 200, and the peripheral surface of the vacuum roll 661. A portion that becomes the exterior sheet 12M for the interior body is stretched between the cutter roll 662 that cuts the portion that becomes the exterior body sheet 12M for the interior body that is fed along the predetermined distance in the MD direction, and the vacuum roll 661 and the cutter roll 662. And a vacuum conveyer 663 for feeding in. On the upstream side of the slip cutter device 606, there is provided a hot melt adhesive applicator 664 for fixing the portion to be the exterior sheet 12M for the interior body to the back surface of the interior body 200. A feed roll 665 is provided for feeding a portion to be the exterior sheet 12M for the interior body supplied from the split slitter 600 to the slip cutter device 606 at a predetermined speed. Further, while the rotation speed of the vacuum roll 661 and the transfer speed of the portion serving as the interior body 200 are synchronized, the feed speed of the feed roll 665 and the transfer speed of the vacuum conveyor 663 are based on the rotation speed of the vacuum roll 661. Has been too late. Therefore, the portion that becomes the exterior body exterior sheet 12M is applied to the vacuum roll 661 after being applied with a fixing hot melt adhesive in advance, and is attached to the vacuum roll 661 peripheral surface by suction, and then is cut by the cutter roll 662. Individually after being cut along the peripheral surface of the vacuum roll 661 at the feed speed of the feed roll 665 and the vacuum conveyor 663 while being slipped against the peripheral surface of the vacuum roll 661 until being cut, and being cut by the cutter roll 662 The interior body exterior sheet 12M is transported at the rotational speed of the vacuum roll 661, and the interior body exterior sheet 12M is transported at intervals in the MD direction due to slip and speed change. It is affixed intermittently on the back side of.

  The application pattern of the adhesive to the exterior body exterior sheet 12M is not particularly limited, and a non-contact type in which the hot melt adhesive is applied in a film form by a contact type application device or the hot melt adhesive is sprayed by air. You may apply | coat with a coating device. The hot-melt adhesive contact-type coating apparatus is a device for bringing a jetting machine into contact with an application target when applying a hot-melt adhesive, and examples thereof include a slot coater and a roll coater. On the other hand, the non-contact type coating apparatus is a device that spreads the hot melt adhesive by air without applying the blower to the application target when applying the hot melt adhesive, and can be spirally applied. Examples thereof include a coating device, an omega coating device and a control seam coating device that can be applied in a wavy shape, a curtain coating device that can be applied in a planar shape, and a dot coating device that can be applied in a spot shape. FIG. 14 shows an example of an adhesive application pattern by the hot melt adhesive applicator 664, and slot coaters and curtains are provided on both side edges so that the exterior sheet 12M for the interior body is difficult to peel off from the side edges. The hot melt adhesive HM1 is continuously applied and firmly fixed by a coating device, and the intermediate portion in the width direction between them is coated with an adhesive such as spiral coating so as not to impair air permeability and flexibility. The hot melt adhesive HM2 is applied and fixed by a coating method with a small amount of coating. FIG. 14A shows an example in which the side edge of the exterior sheet for interior body 12M is linear along the front-rear direction, and continuous application of the hot melt adhesive HM1 on both side edges is continued in the MD direction. On the other hand, FIG. 14 (b) shows an application pattern in the case where there is a constriction on the side portion of the exterior sheet 12M for the interior body as in the second embodiment described later. The hot melt adhesive HM1 is continuously applied only to the part not having the constriction (therefore, the application is intermittent in the MD direction), and the other parts are spirally applied with the application width corresponding to the minimum width of the constricted part. The hot melt adhesive HM2 is continuously applied in the MD direction by a coating method with a small amount of adhesive applied.

  After the individualized interior body exterior sheet 12M is pasted, the interior body separation device 603 cuts the interior body 200 with a predetermined interval in the MD direction to form individual interior bodies 200. The direction is rotated so that the front-rear direction is the CD direction, and then supplied to the main body interior body attaching step 504.

  In the main body interior body attaching step 504, the interior body supplied from the interior body production line so as to extend over the continuous belt-like ventral and back-side exterior sheets 12F and 12B which are sequentially conveyed at intervals in the CD direction. 20 is pasted with a hot melt adhesive or the like at a predetermined interval in the MD direction.

  In the subsequent side joining step 505, one side in the CD direction is folded to the other side, the abdomen side portion and the back side portion are overlapped, and joined by a joining device 604 such as heat seal at a predetermined interval in the MD direction. Processing is performed, and the abdominal portion and the back portion are joined to each other in the portion 12A which is the both sides in the width direction of each diaper DP. After that, in the final detaching step 506, in the diaper separating device 605, with a predetermined interval in the MD direction, the boundary between the parts that become individual diapers (the joint part 12A of one diaper among the parts that become adjacent diapers) Are cut between the other diaper joints 12A) to obtain individual diapers.

  In the manufacturing method as described above, the belt-shaped outer sheet material 12S is first divided into three parts to form a part to be the interior body exterior sheet 12M, and this is pasted on the back surface of the part to be the separately manufactured interior body 200 wear. Therefore, by appropriately changing the width of the outer sheet material 12S when it is divided into three and the shape of the dividing line, the width and the side edge shape of the exterior sheet for interior body 12M can be changed, and the degree of design freedom is improved. Moreover, in order to divide the abdominal exterior sheet 12F and the back exterior sheet 12B and use the portion between them as a leg opening, a trim that has been generated by cutting and forming the leg opening in the conventional exterior sheet 12 is performed. This makes it possible to suppress material loss (hereinafter also referred to as trim loss).

  Here, the structure, material, and the like of the diaper manufactured by the above-described method will be described in more detail with reference to FIGS. 4 to 7. This pants-type disposable diaper is a belly covering the stomach side of the wearer's waist. The side exterior sheet 12F and the back side exterior sheet 12B that covers the back side are provided, and both the width direction both side edges of the abdominal side exterior sheet 12F and the width direction both side edges of the back side exterior sheet 12B A cylindrical trunk portion is formed by welding and bonding over the entire vertical direction by heat sealing, ultrasonic welding, or the like. Reference numeral 12A denotes a side seal portion which is a portion where both the exterior sheets 12F and 12B are welded and joined. When the backside exterior sheet 12B extends below the side seal portion 12A as shown in the figure, it is possible to integrally process heat sealing or the like in the vertical range including this portion. it can.

  Further, an interior body 200 is provided so as to extend from the center in the width direction of the inner surface of the abdominal exterior sheet 12F to the center in the width direction of the inner surface of the back exterior sheet 12B in the waistline portion. The exterior sheet 12B is not continuous on the crotch side and is separated. This separation distance can be about 150 to 250 mm in the vicinity of both side edges of the interior body 200 in the width direction.

  The upper opening of the waistline portion becomes a waist opening portion through which the wearer's torso passes, and the leg openings through which the legs are respectively surrounded by the lower edge 12e of the waistline portion and the side edges of the interior body 200 on both sides in the width direction of the interior body 200 Part. In the state where each side seal portion 12A is peeled off and deployed, the shape shown in FIG. 4 is formed. The interior body 200 extends from the back side through the crotch part to cover the abdomen side, and is a part that receives the excrement and absorbs and retains the liquid. This is the part that supports the person.

(Exterior sheet)
The abdominal side exterior sheet 12F and the back side exterior sheet 12B are formed by laminating an outer sheet material 12S (a portion made of the sheet material 12Z) and an inner sheet material 12H (a portion made of the outer portion in the CD direction of the three-dimensional gather 60). is there. The material of each layer is not particularly limited, but is preferably a nonwoven fabric. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. For example, spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, melt blown nonwoven fabric, needle punched nonwoven fabric, thermal bond nonwoven fabric, air-through nonwoven fabric, point bond nonwoven fabric and the like can be exemplified. Since it is excellent in adhesiveness with a member, it is preferable. When using a nonwoven fabric, it is preferable that the basic weight shall be 10-40 g / m < ² >, especially about 10-22 g / m < ² >.

  Further, in order to improve the fit to the waistline, elongated elastic elastic members 15 to 19 such as thread rubber are sandwiched between the outer sheet material 12S and the inner sheet material 12H in both exterior sheets 12F and 12B in a predetermined stretched state. It is fixed with a hot melt adhesive or the like. As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. Hot melt bonding, heat sealing, or ultrasonic bonding can be used to bond the inner and outer layers 12H and 12S in the respective exterior sheets 12F and 12B and to fix the elongated elastic elastic members 15 to 19 sandwiched therebetween. If the entire surface of the exterior sheets 12F and 12B is firmly fixed, the texture of the sheet is impaired, which is not preferable. By combining these, it is preferable that the elongated elastic elastic members 15 to 19 are firmly bonded, and other portions are not bonded or bonded weakly.

  More specifically, the backside exterior sheet 12B has a main body portion 13 that occupies the same vertical range as the side seal portion by the welded portion 12A group, and an extending portion 14 that extends below the main body portion 13. doing. The extending portion 14 includes a width direction central portion 14M that overlaps with the interior body 200, and cover portions 14C that extend to both sides thereof.

  The shape of the extending portion 14 can be determined as appropriate, and is rectangular in the examples shown in FIGS. 4 to 8, but the upper end portion of the extending portion 14 is attached to the main body as in the second and third embodiments described later. It is also possible to extend the lower side of the main body part 13 with the same width as the part 13 and cut the lower side into a shape whose width becomes narrower as it approaches the crotch side. Further, a portion having the same width as that of the main body 13 can be omitted. If comprised in this way, the lower edge 12e of the cover part 14C will come in the shape of a straight line or a curve which approaches the interior body 200 side as it approaches the crotch side. The shape is also beautiful.

  Although the dimension of the extension part 14 can be determined as appropriate, the length in the width direction of the cover part 14C (the maximum distance in the width direction between the lower edge 12e of the cover part 14C and the side edge of the interior body 200) is 80 to 160 mm. It is preferable that the length (extending length) of the cover portion 14C in the vertical direction is 30 to 80 mm. In addition, when the lower edge 12e of the cover portion 14C is curved as in the second and third embodiments described later, it is determined by the widest portion in the width direction and the widest portion in the vertical direction of the extension portion 14. When the area of the quadrangle is S, it is appropriate that the area of the extended portion 14 is 20 to 80%, particularly 40 to 60% with respect to S.

  The main body portion 13 can be conceptually divided into an upper end portion (waist portion) W and a lower lower portion U below this in the vertical direction, and the range varies depending on the size of the product. The vertical length of the portion W can be 15 to 80 mm, and the vertical length of the lower portion U can be 35 to 220 mm.

  In the upper end part (waist part) W of the main body part 13, a plurality of back-side waist elastic elastic members 17 are vertically spaced so as to be continuous across the entire width direction between the inner and outer layers 12H and 12S. And it is being fixed in the state extended | stretched along the width direction by the predetermined expansion | extension rate. In addition, one or a plurality of the back-side waist elastic elastic members 17 disposed in the region adjacent to the lower portion U of the main body 13 may overlap with the interior body 200. You may provide in the width direction both sides except the width direction center part which overlaps with the body 200, respectively. The back waist elastic elastic member 17 has a thickness of 300 to 1240 dtex, particularly about 470 to 940 dtex of rubber thread at an interval of 4 to 12 mm, and an expansion ratio of 150 to 400%, particularly 220 to It is preferable to fix at about 320%. Further, it is not necessary for all of the back side waist elastic elastic members 17 to have the same thickness and extension rate. For example, the elastic waist members may have different thicknesses and extension rates at the upper and lower portions of the back waist part. Good.

  Further, in the lower portion U of the main body 13, the entire width direction is continuous between the inner and outer layers 12 </ b> H and 12 </ b> S, except for the central portion in the width direction that overlaps with the inner body 200, on the upper side and on both sides in the width direction. As described above, the plurality of first elongated elastic elastic members 15 are fixed in a state of being spaced apart in the vertical direction and stretched along the width direction at a predetermined stretch rate. As the first elongated elastic elastic member 15, a thread rubber having a thickness of 300 to 1240 dtex, especially about 470 to 940 dtex, about 1 to 15 mm, particularly about 5 to 30 at intervals of 3 to 8 mm, and an elongation ratio of 200 to 200 respectively. It is preferable to fix at 350%, particularly about 240 to 300%.

  Further, in the extended portion 14, the entire width direction (at least over the entire cover portion 14 </ b> C) is provided between the inner and outer layers 12 </ b> H and 12 </ b> S, except for the central portion in the width direction that overlaps the inner body 200. ) A plurality of second elongate elastic elastic members 16 are fixed in a state of being stretched along the width direction at a predetermined stretch rate at intervals in the vertical direction so as to be continuous. As the second elongated elastic elastic member 16, a rubber thread having a thickness of 300 to 1240 dtex, particularly about 470 to 940 dtex, about 2 to 10 at intervals of 5 to 40 mm, particularly 5 to 20 mm, and an elongation ratio of 150 to It is preferable to fix at 300%, particularly 180 to 260%.

  On the other hand, the ventral exterior sheet 12F is composed of only a main body part (portion that occupies the same vertical range as the side seal part 12A by the welded part group) basically the same as the main body part 13 of the back side exterior sheet 12B. It has a rectangular shape extending along the waistline direction, and does not have the extending portion 14 like the backside exterior sheet 12B.

  That is, among the upper end portion (waist portion) W and the lower portion U of the ventral side exterior sheet (main body portion) 12F, the upper end portion W is continuous between the inner and outer layers 12H and 12S so as to be continuous over the entire width direction. The plurality of abdominal waist elastic elastic members 18 are fixed in a state where they are spaced apart in the vertical direction and stretched along the width direction at a predetermined stretch rate. The ventral waist elastic elastic member 18 is preferably as close as possible in number, thickness, stretch rate, spacing, and vertical arrangement with respect to the back waist elastic elastic member 17, but may be different. When differentiating, the difference in number is 6 or less, preferably 3 or less, the difference in thickness is 450 dtex or less, preferably 300 dtex or less, the difference in elongation is 100% or less, preferably 40% or less, the difference in spacing Is 10 mm or less, preferably 5 mm or less.

  Further, in the lower portion U of the abdominal exterior sheet 12F (main body portion), except for the central portion in the width direction that overlaps the interior body 200 between the inner and outer layers 12H and 12S, the upper portion and both sides in the width direction are provided. The plurality of third elongated elastic elastic members 19 are fixed in a state where they are stretched along the width direction at a predetermined stretch rate at intervals in the vertical direction so as to be continuous over the entire width direction. . Although the vertical disposition range of the third elongated elastic elastic member 19 may be a part of the lower portion, it is preferable that the third elongated elastic elastic member 19 is substantially the whole (a range in which the expansion / contraction force acts on the whole).

  The third elongated elastic elastic member 19 is preferably as close as possible to the first elongated elastic elastic member 15 in terms of number, thickness, stretch rate, spacing, and vertical arrangement, but may be different. When differentiating, the difference in number is 10 or less, preferably 5 or less, the difference in thickness is 450 dtex or less, preferably 300 dtex or less, the difference in elongation is 100% or less, preferably 40% or less, the difference in spacing Is 10 mm or less, preferably 5 mm or less.

  The abdominal side exterior sheet 12F in the illustrated form is composed of only the portion that occupies the same vertical range as the side seal portion 12A, but the main body portion 13 that occupies the same vertical range as the side seal portion 12A, as with the back side. And an extension part 14 extending below the main body part 13 (see second and third embodiments to be described later). Thereby, the leg periphery shape of the abdominal exterior sheet | seat 12F can be made into the shape fitted along a buttock. In this case, the area and the length in the front-rear direction of the extending part 14 are preferably 10 to 80% of the area and the length in the front-rear direction of the extending part 14, and more preferably 20 to 50%. If the extending portion 14 is excessively large, the fitting property is impaired, which is not preferable.

  On the other hand, as shown in the figure, the first, second, and third elongated elastic elastic members 15, 16, and 19 are provided on both sides in the width direction except for the center portion in the width direction that overlaps the interior body 200. However, it is preferable because the inner body 200 and the outer sheets 12F and 12B are difficult to peel off. In this form, in addition to the form in which elastic elastic members are present only on both sides in the width direction, one side in the width direction across the inner body 200 There is an elastic stretch member from one side to the other side, but the elastic stretch member is cut at the central portion in the width direction overlapping with the interior body 200, and the stretch force does not act (substantially no elastic stretch member is provided) (Equal) is also included. Further, part or all of the first, second, and third elongated elastic elastic members 15, 16, and 19 are provided so that the elastic force acts on the entire width direction of the main body part 13 and the extending part 14. It can also be provided across the body 200 from one side in the width direction to the other side.

(Interior body)
Although the interior body 200 is rectangular in the illustrated example, it can take any shape. As shown in FIG. 8, the interior body 200 includes a top sheet 30 on the body side, the liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. On the back side of the liquid-impermeable sheet 11, an interior body exterior sheet 12 </ b> M that covers the back surface of the interior body 200 is provided. Furthermore, in order to prevent excrement from leaking on both sides of the interior body 200, solid gathers 60 that stand on the body side are provided on both sides of the interior body 200. Although not shown, the constituent members of the interior body 200 can be appropriately fixed to each other by solid, bead or spiral application such as hot melt adhesive.

(Top sheet)
The top sheet 30 has a property of allowing liquid to pass through, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .

  The top sheet 30 may be composed of a single sheet or a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

(Intermediate sheet)
Although not shown, an intermediate sheet (also referred to as “second sheet”) having a higher liquid permeation rate than the top sheet 30 may be provided in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorber. it can. This intermediate sheet not only improves the absorption performance by the absorber by quickly transferring the liquid to the absorber, but also prevents the “returning” phenomenon of the absorbed liquid from the absorber, and the top sheet 30 is always dried. State. The intermediate sheet can be omitted.

Examples of the intermediate sheet include the same material as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. Is preferred. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

  The intermediate sheet is preferably disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet in the longitudinal direction may be the same as the length of the absorbent body 56 or may be within a short length range centered on the region that receives the liquid.

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, a film material (waterproof film) made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a nonwoven fabric is laminated on a polyethylene sheet, Non-woven fabrics that are substantially liquid-impervious with a waterproof film interposed (in this case, a liquid-impervious sheet is composed of the waterproof film and the non-woven fabric) can be exemplified. Of course, in addition to this, materials having liquid impermeability and moisture permeability, which have been used and used in recent years from the viewpoint of preventing stuffiness, can also be exemplified. As the sheet of the material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction. Examples of the microporous sheet obtained in this way can be given. In addition, non-woven fabric using micro-denier fiber, strengthening leak-proofing by reducing the voids of the fiber by applying heat or pressure, and applying water-absorbing resin or hydrophobic resin or water repellent. A sheet that is liquid-impermeable without using a film can also be used as the liquid-impermeable sheet 11.

  Further, the inner surface or the outer surface of the liquid-impermeable sheet 11 may be designed by printing or coloring. Further, a printed or colored design sheet, which is a separate member from the interior body exterior sheet 12M, may be attached to the outside of the liquid-impermeable sheet 11. Further, an excretion indicator 80 whose color changes due to absorption of the liquid component can be provided inside the liquid-impermeable sheet 11.

(Three-dimensional gather)
The three-dimensional gather 60 is a belt-like member that extends over the entire front-rear direction along both side portions of the interior body 200, blocks urine and soft stool that move in the lateral direction along the top sheet 30, and prevents side leakage. It is provided for this purpose. The three-dimensional gather 60 of the present embodiment is provided so as to stand up from the side portion of the interior body 200, the base side portion rises obliquely toward the center in the width direction, and the tip side portion from the intermediate portion has a width. It stands up diagonally outward in the direction.

  More specifically, the three-dimensional gather 60 folds the belt-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction and folds it into two. In addition, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. A base end portion (an end portion on the side opposite to the sheet folding portion in the width direction) located on the opposite side to the front end portion of the three-dimensional gather 60 is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200. A portion other than the attachment portion 65 is a protruding portion 66 (a portion on the folded portion side) protruding from the attachment portion 65. The illustrated form is a line contact type three-dimensional gather in which the projecting portion 66 is not folded outward in the width direction, but the projecting portion 66 is located on the base side portion toward the center in the width direction and the width direction outer side from the tip of the base side portion. It is also possible to provide a surface contact type three-dimensional gather consisting of the tip side portion folded back. And while the front-and-rear direction both ends 67 of the protruding portions 66 are in the lying state, they are the lying portions 67 fixed to the side surface of the topsheet 30 by hot melt adhesive or heat sealing, between these, The intermediate portion in the front-rear direction is a non-fixed free part, and an elongated elastic member 63 along the front-rear direction is fixed to the free part in an extended state.

The gather sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric with excellent uniformity and concealment, and water repellent with silicon as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. The term “elongation rate” means a value when the natural length is 100%.

  2-6 are preferable and, as for the number of the elongate elastic expansion-contraction members 63 provided in the free part of the three-dimensional gather 60, 3-5 are more preferable. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side.

  The fixing target of the attachment portion 65 of the three-dimensional gather 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable back sheet 11, and the absorbent element 50 in the interior body 200.

  In the three-dimensional gather 60 thus configured, the contraction force of the elongated elastic elastic member 63 acts so that both ends in the front-rear direction are brought close to each other, but the both ends in the front-rear direction of the protruding portion 66 are fixed so as not to stand up. On the other hand, since they are non-fixed free portions, only the free portions stand up against the body side as shown in FIG. In particular, when the attachment portion 65 is positioned on the back surface side of the interior body 200, the three-dimensional gather 60 stands up so as to open outward in the width direction at the crotch portion and in the vicinity thereof. It comes in contact, and the fit is improved.

  Note that, unlike the illustrated embodiment, the three-dimensional gathers can be provided in double (two rows) on the left and right sides of the interior body 200.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps at least the back and side surfaces of the absorbent body 56. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening as necessary a synthetic fiber tow (fiber bundle) such as cellulose acetate, in addition to those obtained by stacking short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

  The absorber 56 may be rectangular, but as shown in FIG. 6, the front end portion 56F, the rear end portion 56B, and a constricted portion having a narrower width than those of the front end portion 56F and the rear end portion 56B. It is preferable to form an hourglass shape having 56N because the fit of the absorber 56 itself and the three-dimensional gather 60 around the legs is improved.

  The size of the constricted portion 56N can be determined as appropriate, but the minimum width of the constricted portion 56N is about 0.5 to 0.9 times, particularly about 0.5 to 0.7 times the entire width of the absorber 56. preferable. Further, the length in the front-rear direction of the constricted portion 56N is preferably about 25 to 50% of the entire length of the absorber 56.

(Superabsorbent polymer particles)
Superabsorbent polymer particles include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent polymer particles, those having a water absorption rate of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.

  Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , the effect is saturated.

  If necessary, the superabsorbent polymer particles can adjust the spraying density or spraying amount in the plane direction of the absorber 56. For example, it is possible to increase the application amount of the liquid excretion site as compared to other sites. When gender differences are taken into account, men can increase the front spray density (amount), while women can increase the center spray density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

(Packaging sheet)
When the packaging sheet 58 is used, a paper material such as tissue paper or crepe paper, a non-woven fabric, a polylaminated non-woven fabric, a sheet with small holes, or the like can be used as the material. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene, etc. can be used as the material. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  The packaging sheet 58 may cover only the back and side surfaces of the layer in addition to the form for wrapping the entire absorbent body 56. Although not shown, only the upper and side surfaces of the absorbent body 56 are covered with crepe paper or a nonwoven fabric, and the lower surface is covered with a liquid-impermeable sheet such as polyethylene, and the upper surface of the absorbent body 56 is covered with crepe paper or a nonwoven fabric. For example, the lower surface may be covered with a liquid-impermeable sheet such as polyethylene (each of these materials is a component of the packaging sheet). If necessary, the absorbent body 56 may be sandwiched between upper and lower two-layer packaging sheets or disposed only on the lower surface, but this is not desirable because it is difficult to prevent the movement of the superabsorbent polymer particles.

(Exterior sheet for interior body)
On the back side of the interior body 200, an exterior sheet 12M for interior bodies that forms the outer surface of the product is provided. The material of the interior body exterior sheet 12M is an exterior sheet material (in the illustrated example, the outer sheet material 12S).

  The total length (front-rear direction length) of the exterior body exterior sheet 12M can be the same as the total length (front-rear direction length) of the interior body 200, but can be different. In particular, in the disposable diaper manufactured by the above-described manufacturing method, in the region where the interior body 200 and the abdominal exterior sheet 12F and the back exterior sheet 12B overlap, the back surface of the interior body 200 is the abdominal exterior sheet 12F and the back exterior sheet. 12B, when it is intended to cover the back surface of the interior body 200, it is not necessary to provide the exterior sheet 12M for the interior body in this region, and if it is provided, the air permeability may be lowered or hardened. There is also a risk. Therefore, as described above, the overall length of the exterior body exterior sheet 12M is preferably shorter than the overall length of the interior body 200 and longer than the spacing between the abdominal exterior sheet 12F and the back exterior sheet 12B. In a normal case, the total length of the exterior body exterior sheet 12M is the length in the front-rear direction of the region exposed between the abdominal exterior sheet 12F and the back exterior sheet 12B in the interior body 200, and the abdominal exterior sheet 12F and the back side. It is desirable that the overlap margin for the exterior sheet 12B is about 15 to 40 mm.

  In addition, the width (full width) of the exterior body exterior sheet 12M can be the same as the width (full width) of the interior body 200, but can also be different, and is particularly narrower than the width of the interior body 200. Is preferred. According to the manufacturing method described above, the width of the outer sheet material 12S at the time of the three division can be changed as appropriate, and the arrangement adjustment process can be performed as necessary. The width can be designed to be narrower than the width of the interior body 200. As a result, as shown in FIGS. 4 to 7, the side edge of the exterior body exterior sheet 12 </ b> M is separated from the side edge of the interior body 200 toward the center in the width direction. When rubbing, the side edges of the exterior body exterior sheet 12M do not irritate the skin. Further, when the exterior sheet for interior body 12M is attached, the interior body 200 is hardened due to the influence of the adhesive means (for example, adhesive), but the side edge of the interior body exterior sheet 12M is the side edge of the interior body 200. If it is spaced apart from the center in the width direction, the side portion of the interior body 200 can be flexibly brought into contact with the leg without being hardened. In a normal case, the width of the exterior body exterior sheet 12M is desirably about 70 to 95% of the width of the interior body 200.

<Second form>
FIG. 8 shows a second embodiment, in which the plan view of the upper part shows the main line including the manufacture of the exterior sheets 12F and 12B, and the plan view of the middle part shows the interior body for manufacturing the interior body 200. 200 production lines are shown, and the front view of the lower part shows the entire production flow. The manufacturing flow of the second form is different from the first form only in the cutting pattern in the exterior sheet material dividing step 510.

  That is, in the second embodiment, as shown in FIG. 8, in the three-division slitter 600 of the exterior sheet material dividing step 510, both ends in the MD direction from the middle in the MD direction in the portion that becomes the exterior sheet 12 </ b> M for the interior body of each interior body 200. It divides | segments with the curve which comes to be located in the CD direction outer side continuously or in steps. In the present invention, the width at the time of dividing the exterior sheet material into three parts can be changed as appropriate. Therefore, by dividing in such a pattern, as shown in FIG. 9 and FIG. The lower edge 12e of the sheet 12B and the both side edges of the exterior body exterior sheet 12M have a shape with excellent fit to the legs. That is, the lower edge 12e of the abdominal exterior sheet 12F extends along the buttock, and the lower edge 12e of the backside exterior sheet 12B extends along the ridge groove so that the curve is positioned on the waist side toward the both sides in the width direction. Can be used.

  In addition, the exterior sheet 12M for the interior body has a shape in which the middle portion in the front direction is constricted in the width direction, and has a shape along the leg crotch. Therefore, the side edge of the exterior sheet 12M for the interior body hardly hits the skin. In particular, the side portions of the 200 come into contact with the legs flexibly without being hardened at the portions that contact the legs. In particular, as shown in the illustrated example, when the interior body 200 is rectangular, the front-rear direction intermediate portion of the absorbent body 56 has a shape that is bound in the width direction so as to follow the curved surface around the legs. The side edge portion of the interior body 200 is left in the constricted portion 56N of the body 56, but this surplus portion is hardened by the interior body exterior sheet 12M, or the interior body exterior sheet 12M side is closer to the outside of the excess portion. If the edge is located, there is a possibility that the feeling of wearing improved by making the absorbent body 56 constricted. Therefore, particularly in such a case, it is preferable that the front-rear direction intermediate portion of the exterior body exterior sheet 12M is constricted as described above.

  As in the first embodiment, when the side edge shape of the exterior sheet for interior body 12M is a straight line along the front-rear direction, even if the position in the front-rear direction at the time of pasting is slightly shifted, it is difficult to cause a problem. If the side edge shape of the exterior sheet 12M for the interior body is an irregular shape (a shape other than a linear shape along the front-rear direction), such as the form, the displacement of the front-rear direction position at the time of attachment is May affect the appearance and fit. Moreover, such misalignment is caused by material exchange and is difficult to avoid.

  Therefore, in the embodiment shown in FIG. 8, a camera 666 is installed between the feed roll 665 and the slip cutter device 606, and a portion that becomes the exterior body exterior sheet 12 </ b> M is captured at a predetermined interval by the camera 666. Is analyzed stepwise or continuously so as to cancel out the deviation according to the amount of deviation between the detected position and the target position (preset). Further, the feed speed of the feed roll 665 is adjusted. Thereby, the front-back direction shift | offset | difference of the sticking position of the exterior sheet | seat 12M for interior bodies can be prevented.

  When the feed speed is controlled by the feed roll 665 as described above, the line tension on the upstream side of the feed roll 665 fluctuates. Therefore, as shown in FIG. It is preferable to provide a tension adjusting roll 667 that changes the transfer tension by changing the passage position of the portion that becomes 12M.

<Third embodiment>
In the present invention, the width of the exterior sheet 12 material when it is divided into three can be changed as appropriate. Therefore, by forming the dividing line in the exterior sheet material dividing step 510 into a wavy line, as shown in FIGS. The lower edge 12e of the side exterior sheet 12F and the back exterior sheet 12B and both side edges of the interior body exterior sheet 12M may be wavy. Such a wavy edge 12e not only has a pretty appearance, but if the lower edge 12e of the ventral exterior sheet 12F and the back exterior sheet 12B is such a wavy line, the contact length with the skin is short. Thus, a soft touch can be obtained.

  Also in the third embodiment, the speed control of the feed roll 665 based on the image analysis can be performed as in the second embodiment.

<Others>
The present invention uses a tape type disposable diaper or both a tape type and a pants type by providing an attaching step of a detachable connecting means such as an adhesive tape or a mechanical tape instead of the side joining step 505. It can also be applied to possible disposable diapers.

  The present invention can be used for the manufacture of disposable diapers as in the above example.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior sheet, 12B ... Back side exterior sheet, 12F ... Abdominal side exterior sheet, 12H ... Inner sheet material, 12M ... Exterior sheet for interior body, 12S ... Outer sheet material, 30 ... Top Sheet, 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Solid gather, 62 ... Gather sheet, 200 ... Interior body, 501 ... Exterior sheet forming process, 502 ... Cutting process of elastic elastic member, 504 ... Inner body attaching process, 505 ... side part joining process, 506 ... cutting process, 510 ... exterior sheet material dividing process, 513 ... arrangement adjusting process, 600 ... three-division slitter, 601 ... cutting device, 602 ... die cutter, 603 ... interior Body cutting device, 604 ... joining device, 605 ... diaper cutting device, 606 ... slip cutter device.

Claims (8)

Built-in abdominal exterior sheet, back exterior sheet, and absorbent body that absorbs excrement provided from the center in the width direction of the inner surface of the abdominal exterior sheet to the center in the width direction of the inner surface of the back exterior sheet And an interior body to
The manufacturing method of the disposable diaper provided with the exterior sheet for interior bodies which the above-mentioned abdominal side exterior sheet and back side exterior sheet are not separated on the crotch side, are separated, and at least cover the back of the interior body in this separation area Because
A belt-shaped exterior sheet material having a predetermined width is divided into three in the CD direction while being conveyed along the continuous direction, and a part to be a ventral exterior sheet and a part to be a back exterior sheet are formed using two of them, The remaining one is the part that becomes the exterior sheet for the interior body,
After cutting the portion to be the exterior sheet for the interior body at a predetermined interval in the MD direction to form individual exterior sheets for the interior body,
After pasting the exterior sheet for the interior body on the back surface of the part to be separately manufactured, the interior body is cut at a predetermined interval in the MD direction to form individual interior bodies, and then the interior body Is attached at a predetermined interval in the MD direction so as to cover the portion that becomes the ventral exterior sheet and the portion that becomes the dorsal exterior sheet that flows at an interval in the CD direction,
After that, by cutting the part to be the ventral exterior sheet and the part to be the back exterior sheet at the boundary of each diaper, to obtain individual diapers,
The manufacturing method of the disposable diaper characterized by the above-mentioned.   In forming the individual exterior body exterior sheet, the portion serving as the interior body exterior sheet is shorter in the MD direction than the overall length of the interior body and from the spacing between the ventral exterior sheet and the back exterior sheet. The manufacturing method of the disposable diaper of Claim 1 cut | disconnected at a long predetermined space | interval.   The manufacturing method of the disposable diaper of Claim 1 or 2 whose width | variety of the part used as the said exterior sheet for interior bodies is narrower than the width | variety of the said interior body. The exterior sheet material is divided into three parts, the middle part in the CD direction is used as the exterior sheet for the interior body, and the abdomen side exterior sheet is formed using the part on the one side in the CD direction and the part on the other side in the CD direction. While forming the part and the part to be the back side exterior sheet,
At the time of the three divisions, the dividing line for the three divisions is continuously or stepwise outward in the CD direction from the middle in the MD direction toward the both ends in the MD direction in the part that becomes the exterior sheet for the interior body of the individual interior body. A curve that comes to be located,
The manufacturing method of the disposable diaper of any one of Claims 1-3.   The manufacturing method of the disposable diaper according to claim 4, wherein the absorbent body has a shape in which a front intermediate portion is constricted in a width direction, and the interior body is rectangular. Built-in abdominal exterior sheet, back exterior sheet, and absorbent body that absorbs excrement provided from the center in the width direction of the inner surface of the abdominal exterior sheet to the center in the width direction of the inner surface of the back exterior sheet And an interior body to
In the disposable diaper provided with the exterior sheet for the interior body that covers the back side of the interior body in at least this separation region, and the abdomen exterior sheet and the back exterior sheet are not continuous on the crotch side and are separated from each other,
The material of the ventral side exterior sheet and the back side exterior sheet is the same as the material of the exterior body exterior sheet,
The width of the exterior sheet for the interior body is narrower than the width of the interior body,
The lower edge of the belly side exterior sheet is shaped to coincide with one side edge of the exterior body exterior sheet, and the lower edge of the back side exterior sheet coincides with the other side edge of the interior body exterior sheet. Yes,
A disposable diaper characterized by that. The lower edge of the abdominal exterior sheet and the lower edge of the back exterior sheet are in a curved shape located on the waist side toward the both sides in the width direction, respectively.
The disposable diaper according to claim 6, wherein the exterior sheet for an interior body has a shape in which a front intermediate portion is constricted in a width direction.   The disposable diaper according to claim 7, wherein the absorbent body has a shape in which a front intermediate portion is constricted in the width direction, and the interior body is rectangular.

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