JP2002345883A - Continuous manufacturing method for pants-type disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing disposable diapers continuously in a high speed, using resin particles having a high water absorption rate. SOLUTION: The processes A to C for forming an outer sheet laminated material 2, and the processes D to H for forming an absorbing sheet laminated material 3 with a flap can be operated continuously in the longitudinal direction in a high speed. The processes I to L for forming a pants-type laminated material 21 by rotating a absorbing material section 3' cut from the absorbing sheet laminated material 3 with the flap by 90 degrees to the operating direction and attach it to the outer sheet laminated material 2, forming a leg opening S to the formed pants-type laminated material 21, and forming single piece of a pants-type diaper by cutting the folded material 22 of the pants-type laminated material 21 can also be continuously operated in the longitudinal direction in a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous method for producing pants-type disposable diapers.

[0002]

2. Description of the Related Art Various methods of continuously manufacturing pants-type disposable diapers have been proposed.

By the way, if a super-thin water-absorbing sheet using high water-absorbing resin particles is used as a water-absorbing material instead of a general pulp material, it is soft and wearable so that the presence of the water-absorbing sheet is not noticed. The advantage that the feeling is excellent is obtained.

[0004]

However, mass production of a process of forming a super-thin absorbent sheet body by bonding super-absorbent resin particles to a water-absorbent sheet has not been sufficiently established, so There is an increasing demand for continuous high-speed production of pants-type disposable diapers using a water-absorbing sheet.

SUMMARY OF THE INVENTION The present invention has been made in order to meet the above-mentioned demands, and has been made possible to efficiently and continuously produce high-speed pants using an ultra-thin water-absorbing sheet using high water-absorbing resin particles. It is an object of the present invention to provide a continuous method for producing a disposable diaper.

[0006]

In order to solve the above-mentioned problems, the present invention is directed to a first exterior sheet which is continuously run in a longitudinal direction while at least a center position and both sides of an upper surface of the first exterior sheet in a width direction. Step A of applying a hot melt adhesive to the first position and the center position of the first exterior sheet. A pair of stretched elastic yarns for leg gathers is sine-curved in the width direction with respect to the running direction. Adhering while drawing, a circular elastic portion for the leg is formed at a predetermined pitch, and a pair of elastic waist yarns in an extended state are linearly formed in the running direction on the both side positions of the first exterior sheet in the running direction. A step B of forming an elastic portion for waist by adhering to the first outer sheet; and a step C of forming an outer sheet laminate by bonding the second outer sheet to the upper surface of the first outer sheet with the elastic yarns interposed therebetween. Outside the above The hot-melt adhesive is applied to a predetermined position on the upper surface of the first water-absorbing sheet while the first water-absorbing sheet having a width narrower than the adjacent elastic portion for the leg of the sheet laminate is continuously run in the length direction. And bonding a hot melt adhesive to the second water absorbing sheet having substantially the same shape as the first water absorbing sheet so as to form a gap through which liquid can pass. A step E of bonding the superabsorbent resin particles to the upper surface of the first water-absorbent sheet while sandwiching the superabsorbent resin particles therebetween to form an absorbent sheet body;
A step F of forming a water-absorbing sheet laminate by partially bonding sheets having the same shape as or less than the first and second water-absorbing sheets to the upper surface of the above-mentioned absorbent sheet body; Step G of forming a pair of flap sheet bodies by adhering elastic flap yarns in an extended state to the inner edge of each flap sheet while continuously running, and forming the pair of flap sheet bodies into a width of the absorbent sheet laminate. In the state of being separated in the direction, a step H in which each outer edge is joined to the upper surface of both sides of the absorbent sheet laminate to form an absorbent sheet laminate with a flap, and the tensioned state of the absorbent sheet laminate with a flap, While maintaining the cut length, the cut absorber piece is turned by 90 degrees with respect to the traveling direction, and the turned cut absorber piece is placed next to the upper surface of the exterior sheet laminate. Step I of forming a pants laminate by joining between matching leg elastic portions, Step J of forming a leg opening in the pants laminate, Step K of forming a folded body by folding the center line in the length direction into two valley lines to form a folded body, and joining the folded body in the width direction between the adjacent leg elastic portions. And a step L of forming a single pants body by cutting at an intermediate position of the joint portion.

According to the present invention, the steps A to C for forming the exterior sheet laminate and the steps D to H for forming the absorbent sheet laminate with the flap can be performed at a high speed while continuously traveling in the length direction. Further, the cut absorbent piece of the absorbent sheet laminate with the flap is turned by 90 degrees with respect to the running direction and joined to the exterior sheet laminate to form a pants laminate, and the leg openings are formed in the pants laminate. And the steps I to L of forming a single pants body by joining and cutting the folded body of the pants laminate can be performed at a high speed while continuously running in the length direction.

According to a second aspect, in the step E,
The means for applying the hot melt adhesive applied to the second water absorbing sheet is preferably curtain spray or spiral spray.

According to a third aspect, in the step F,
The sheet is a perforated diffusion sheet, and a peripheral wall of a hole of the perforated diffusion sheet is protruded toward the upper surface side of the absorbent sheet body. Preferably, a portion is formed.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 5 shows a pants-type disposable diaper 1;
(A) is a plan view in an expanded state, (b) is a front view in an assembled state, and FIG. 6 is an exploded perspective view of the pants-type disposable diaper 1.

The underpants-type disposable diaper 1 is basically composed of an outer sheet laminate 2 and a water-absorbent sheet laminate 3 with a flap.

The exterior sheet laminate 2 is composed of a first exterior sheet 4, a second exterior sheet 5, an elastic yarn 6 for a leg, and an elastic yarn 7 for a waist.

The first outer sheet 4 and the second outer sheet 5 are formed in the outer shape of the pants-type disposable diaper 1 and have legs on both sides of the crotch R between the front abdomen P and the back back Q. An opening S is formed.

It is preferable to use a synthetic fiber non-woven fabric having relatively high tensile strength and excellent air permeability for each of the exterior sheets 4 and 5, but if one non-woven fabric is a non-woven fabric sufficient to maintain the strength, the other is used. Nonwovens require less strength. For example, if a high strength Svanbond nonwoven fabric is used as one nonwoven fabric, for example, a melt blown nonwoven fabric can be used as the other nonwoven fabric.

On the upper surface of the first exterior sheet 4, a leg elastic thread 6 is extended in a semicircular shape along the opening edge of each leg opening S to form a leg elastic portion. At the same time, the waist elastic thread 7 is extended in a straight line along the upper edges of the front abdomen P and the back back Q, thereby forming the waist elastic portion.

In the manufacturing process to be described later, the leg elastic yarn 6 is provided so as to draw a sine curve that is line-symmetric in the width direction, as shown by a two-dot chain line a in FIG. By cutting, the crotch portion R contracts by snapback, and the leg opening portion S is attached in a semicircular shape. The leg elastic yarn 6 of the present embodiment
Are provided so as to intersect at the crotch portion R, but may be cut at the crotch portion R after being provided so as not to intersect at the crotch portion R.

Each of the elastic yarns 6 and 7 is a polyurethane yarn,
Polyurethane film, natural rubber, urethane foam and the like can be used, and not only one but also a plurality may be provided.

Then, on the upper surface of the first exterior sheet 4,
By bonding the second exterior sheet 5 with the elastic yarns 6 and 7 sandwiched therebetween, the exterior sheet laminate 2 is formed.

In the manufacturing process to be described later, the exterior sheet laminate 2 is moved in the traveling direction (see a two-dot chain line b and an arrow in FIG. 6).
Is formed continuously in the intercepting direction.

The water-absorbent sheet laminate 3 with flaps is
A water-absorbing sheet laminate 14 including a first water-absorbing sheet 10, a second water-absorbing sheet 11, super-water-absorbing resin particles 12, and a perforated diffusion sheet 13 (or a top sheet 13 '); a pair of flap sheets 15; And a flap sheet body 17 composed of an elastic yarn 16.

Each of the water-absorbing sheets 10 and 11 is set to have an outer width W2 smaller than the inner width W1 of the leg elastic portion of the exterior sheet laminate 2 (see FIG. 7A), and its length. Is set to be substantially the same as the length of the exterior sheet laminate 2.

The first water-absorbing sheet 10 uses a water-blocking synthetic resin (eg, polyethylene) film or a water-permeable synthetic fiber nonwoven fabric. When the former film is used, a thin, excellent strength characteristic and inexpensive film that does not break even if the absorbent sheet 18 is twisted is demanded.

Therefore, when it is difficult to employ such a film or when the amount of urine absorbed is increased, it is preferable to use the latter nonwoven fabric. In this case, in order to block the urine and the like, it is necessary to use a blocking sheet 10 ′ made of a water-blocking synthetic resin film or a water-repellent or waterproof synthetic fiber nonwoven fabric on the lower surface of the first water-absorbing sheet 10. .

First absorbent sheet 10 and second absorbent sheet 11
When a synthetic resin non-woven fabric is used, any of the non-woven fabrics may be a water-permeable synthetic fiber non-woven fabric, and a non-woven fabric mainly composed of hydrophilic fibers such as a rayon material is preferable. Even a nonwoven fabric mainly composed of a synthetic fiber can be used by subjecting the fiber or the nonwoven fabric to a hydrophilic treatment. In the case where the non-woven fabric of the second water-absorbent sheet 11 is to be subjected to heat fusion bonding with a perforated diffusion sheet 13 to be described later, a low-melting binder fiber or a composite binder fiber containing a low-melting binder component is added in a small amount. It is preferable to mix as a subcomponent.

The superabsorbent resin particles 12 are adhered to the upper surface of the first water-absorbent sheet 10 so as to have a uniform distribution and thickness. As the superabsorbent resin particles 12, it is preferable to use particles of a known superabsorbent resin, such as a polyacrylate, having a large water absorption and a high water absorption rate.

The adhesion of the superabsorbent resin particles 12 is shown in FIG.
As shown in FIG. 8A, bonding may be performed with a gap f around the outer periphery of the first water-absorbing sheet 10, but it may be bonding on the entire surface as shown in FIG. 8A or partial bonding as shown in FIG. Is also good.

By adhering the second water-absorbing sheet 11 to the upper surface of the first water-absorbing sheet 10 with the high water-absorbing resin particles 12 sandwiched therebetween, a water-absorbing sheet body 18 is formed.

As described above, the first water absorbing sheet 1
In some cases, a water-impervious synthetic resin film is used as 0, but a water-permeable synthetic fiber non-woven fabric is generally used at present. "Has been described.

The perforated diffusion sheet 13 does not necessarily need to be set to the same shape as the water-absorbing sheet body 18, and may have at least 10% or more of the area of the water-absorbing sheet body 18. Only the central part of 18,
Alternatively, the shape can be set to be installed only in the front and rear portions.

The perforated diffusion sheet 13 is preferably made of a hydrophobic film material.
As shown in detail in FIG. 9, with a circular hole or a polygonal hole,
It is preferably about 10 to 50% of the area of the perforated diffusion sheet 13, and more preferably about 15 to 30%.

The hole 13a of the perforated diffusion sheet 13
Is formed on the upper surface side of the absorbent sheet member 18 so that a gap 18 is formed between the peripheral wall and the upper surface of the absorbent sheet member 18 by the protrusion 13b. Even if urine or the like is discharged or urine or the like is repeatedly discharged, the discharged urine is rapidly diffused by the perforated diffusion sheet 13, so that the absorption utilization rate of the entire absorbent sheet body 18 is increased. Side leakage is reduced. In addition, since the perforated diffusion sheet 13 has a large number of holes 13a, the number of parts that come into contact with the wearer's skin surface is reduced, so that the slimy feeling and the stuffy feeling are reduced.

The projecting portion 13b is more preferably formed in a tapered funnel shape so that re-wetting due to backflow of urine or the like can be prevented, and the projecting height t is preferably about 0.3 to 2.0 mm. , About 0.5 to 1.5 mm is more preferable.

By selecting the area and installation position of the perforated diffusion sheet 13 and the position and number of the holes 13a, it is possible to rapidly diffuse urine and the like mainly in the length direction.

The second water absorbing sheet 1 of the water absorbing sheet body 18
The water-absorbent sheet laminate 14 is formed by bonding the perforated diffusion sheet 13 to the upper surface of the base member 1 in a dotted or linear manner except for the holes 13a.

Instead of the perforated diffusion sheet 13, a top sheet 13 ′ made of a water-permeable synthetic fiber nonwoven fabric is adhered to the upper surface of the second water-absorbent sheet 11 of the water-absorbent sheet 18, and the water-absorbent sheet laminate 14 is It may be formed.

It is preferable that at least the inner surfaces of the pair of flap sheets 15 are made of a water-repellent or waterproof synthetic fiber nonwoven fabric, and the outer surfaces of the pair of flap sheets 15 are not subjected to water-repellent or waterproof treatment from the viewpoint of feel. It is preferably a fiber, but it may be a hydrophobic fiber.

A flap elastic thread 16 is attached to the inner edge 15a of each flap sheet 15 in an extended state, so that a flap sheet body 17 is formed. Like the elastic yarns 6 and 7, the flap elastic yarn 16 may be a polyurethane yarn or the like, and may include not only one yarn but also a plurality of yarns.

Each of the flap sheet bodies 17 is shown in FIG.
As shown in (a), the outer edge portion 1 of the flap sheet 15 is separated from the absorbent sheet laminate 14 in the width direction.
By joining 5b to the upper surfaces of both sides of the perforated diffusion sheet 13 of the absorbent sheet laminate 14, the absorbent sheet laminate 3 with a flap is formed.

This water-absorbent sheet laminate 3 with flaps is
In a manufacturing process to be described later, it is formed continuously in the longitudinal direction with respect to the running direction (see the two-dot chain line c and the arrow in FIG. 6).

As shown in FIG. 7B, when the width of the perforated diffusion sheet 13 is made smaller than the width of the water-absorbing sheet body 18, the outer edge 15 of the flap sheet 15 is formed.
b may be joined to the upper surfaces of both sides of the second water absorbing sheet 11, respectively. As shown in FIG. 10, the outer edge 15 b of the flap sheet 15 is pierced from the upper surface of the perforated diffusion sheet 13 or the second water-absorbent sheet 11 to the first side by turning around the side surface.
If it is joined to the back surface of the water-absorbent sheet 10, leakage of urine and the like from the side surface of the water-absorbent sheet laminate 14 can be more reliably prevented.

The above-mentioned absorbent sheet laminate 3 with flaps is
In a manufacturing process described later, as shown in FIG. 6, the outer sheet laminate 2 is cut into a length substantially equal to the front-rear length U, and the cut absorbent piece 3 ′ is The underpants laminate 21 is formed by being joined between the adjacent elastic portions for the legs on the upper surface (the state shown in FIG. 5A), and the underpants laminate 21 is formed of an absorbent sheet laminate with flaps (cut absorbent piece 3). ′) The folded body 22 is formed by folding it in two so that the center line T in the longitudinal direction is a valley line so that 3 is on the inner surface side (see FIG. 2). The elastic portions are joined in the width direction, and cut at an intermediate position of the joining portion 23 to form a single pants body 24.
Is formed (the state shown in FIG. 5B), and the pants-type disposable diaper 1 is completed.

Next, a method for continuously manufacturing the pants-type disposable diaper 1 having the above-described configuration will be described.

FIG. 1 is a block diagram of a continuous production line, and FIG.
FIG. 3 is a configuration diagram of a continuous production line, FIG. 3 is a formation diagram of a line for an exterior sheet in the continuous production line, FIG. 4 is a formation diagram of a line for a water absorbing sheet in the continuous production line, and FIGS. It is continuous at the X position.

(1) In the step A, the first exterior sheet 4
Hot melt adhesive spray guns 3 at the center position and both side positions in the width direction while continuously running in the length direction.
By 0, the hot melt adhesive HM is applied to the upper surface of the first exterior sheet 4.

The coating portion HM at the center of the upper surface of the first exterior sheet 4 is intermittent at the intercepting pitch V of the pants 24, and the coating portions HM at both sides are continuous.

(2) In the step B, the first exterior sheet 4
And a pair of leg gather elastic yarns 6 in the stretched state are adhered to the application portion HM at the center position while drawing a sine curve that is line-symmetric in the width direction with respect to the running direction, and the circular leg is formed at the crossing pitch V. Forming an elastic portion for
A pair of stretched waist elastic yarns 7 are linearly adhered to the application portions HM on both sides of the exterior sheet 4 in the running direction to form a waist elastic portion. In addition, the elastic yarn 6 for the leg is provided at the center of the application portion HM at the intercepting pitch V.
Since the hot melt adhesive HM is not applied to the crotch portion R between the crotch portions R, when the intersection portion g is cut in the process J described later, the crotch portion R contracts by snapback and the leg opening portion The portion S is attached in a semicircular shape.

(3) In step C, the first exterior sheet 4
The second exterior sheet 5 is adhered by the application portions HM at the center position and both side positions while the elastic yarns 6 and 7 are sandwiched between the upper surfaces of the exterior sheets, thereby forming the exterior sheet laminate 2.

(4) On the other hand, in step D, while the first water-absorbing sheet (back sheet) 10 is continuously running in the longitudinal direction, the hot-melt adhesive spray gun 31 is used.
A hot-melt adhesive HM is applied to the upper surface of the first water-absorbing sheet 10, and a quantitative supply hopper 32 is
The superabsorbent resin particles (SAP) 12 are adhered while falling.

(5) In the step E, the hot melt adhesive HM is applied by the hot melt adhesive spray gun 33 so as to form a gap through which liquid can pass on the lower surface of the second water absorbing sheet (top sheet) 11. Meanwhile, the superabsorbent resin particles (SAP) 12 are formed on the upper surface of the first water absorbing sheet 10.
The absorbent sheet body 18 is formed by bonding in a state of being sandwiched.

The second water absorbing sheet (top sheet) 11
The hot-melt adhesive HM is applied to the lower surface of the substrate so as to form a gap through which liquid can pass.
In this case, the hot-melt adhesive HM is applied by means of FIG.
Curtain spray S1 as in (a), or FIG.
It is preferable to use a spiral spray S2 as shown in (b), and in such sprays S1 and S2, an infinite number of gaps h through which a liquid can pass can be formed.

When applying the hot melt adhesive HM on the upper surface of the first water-absorbing sheet (back sheet), it is important that the highly water-absorbent resin particles (SAP) 12 are firmly bonded. And Spiral Spray S
In addition to 2, coating by a roll coater may be used.

The absorbent sheet 18 in the above steps D and E
For example, in the technology of fixing the highly water-absorbent resin particles 12 to the upper surface of the first water-absorbent sheet 10 by wet treatment,
Although the production speed is low, it is necessary to produce the superabsorbent resin particles 12 in advance in a separate process. However, as in the present embodiment, the superabsorbent resin particles 12 are dropped onto the hot melt adhesive HM applied on the upper surface of the first water absorbent sheet 10. With the technique of bonding while making the diaper, it can be manufactured at a high speed, and the great advantage is that it can be easily incorporated into the continuous production line of the pants-type disposable diaper 1.

(6) In the step F, the perforated diffusion sheet 13 is heat-sealed (HS) by the heat-sealing mechanism 34 on the upper surface of the absorbent sheet 18 in a dot or line shape except for the hole 13a.
To form the water-absorbent sheet laminate 14.
It should be noted that the perforated diffusion sheet 13 may be partially joined to the absorbent sheet body 18 by adhesion using a hot melt adhesive HM. In place of the perforated diffusion sheet 13, the top sheet 13 'may be partially joined.

In this step F, the blocking sheet 10 ′ is further moved by the hot melt adhesive spray gun 30.
A hot melt adhesive HM is applied to the upper surface of the first absorbent sheet 10, and the blocking sheet 10 'is adhered to the lower surface of the first absorbent sheet 10.
The bonding of the blocking sheet 10 'can be performed in any of the steps D and E. In addition, the first water absorbing sheet 1
When a water-blocking synthetic resin (for example, polyethylene) film is used as 0, the bonding of the blocking sheet 10 'is unnecessary.

(7) On the other hand, in the process G, while the pair of flap sheets 15 are continuously running in the longitudinal direction, the inner edge 15a and the outer edge 15b of each flap sheet 15 are formed by the hot melt adhesive spray gun 35. While applying the hot melt adhesive HM, the stretched flap elastic thread 16 is adhered to the inner edge 15a, and the inner end 15a is wound inward to form a pair of flap sheet bodies 17.

(8) In step H, with the pair of flap sheet bodies 17 separated in the width direction of the absorbent sheet laminate 14, the outer edges 15 b of each flap sheet 15 are placed on both sides of the absorbent sheet laminate 14. It is bonded to the upper surface to form an absorbent sheet laminate 3 with a flap.

(9) Then, in step I, the flap-absorbent sheet laminate 3 is substantially adjusted to the front-rear length V of the exterior sheet laminate 2 by the cutter mechanism 36 while maintaining the tension state of the flap elastic yarn 16. It is cut to the same length, and the cut absorber piece 3 ′ is turned 90 degrees with respect to the traveling direction by the turning mechanism 37, and the turned cut absorber piece 3 ′ is turned.
Are adhered to each other between the elastic portions for the legs on the upper surface of the exterior sheet laminate 2 by applying the hot melt adhesive HM by the hot melt adhesive spray gun 38 to form the pants laminate 21.

(10) In step J, a leg opening S is formed in the leg elastic portion of the pants laminate 21 by the cutter roller / ashivil roller 39.

(11) In step K, the pants laminate 2
1 is cut into two pieces by the two-folding mechanism 40 with the center line T in the longitudinal direction as a valley line so that the absorber piece 3 ′ is on the inner surface side.

(12) In step L, the folded body 11
And a heat-sealing roller 41 between adjacent leg elastic portions.
, And cut at a middle position of the joining portion 23 with a cutter roller / ashibiru roller 42 to form a single pants body 24. Thereby, the pants-type disposable diaper 1 is completed.

In the continuous manufacturing method of the pants-type disposable diaper 1 as described above, the hot melt adhesive HM is applied in the step A while the first outer sheet 4 is continuously run in the length direction. In step C, the elastic yarns 6 for leg gathers and the elastic yarns 7 for waist are adhered, and in step C, the second exterior sheet 5 is adhered with the elastic yarns 6, 7 sandwiched therebetween to form the exterior sheet laminate 2. be able to.

The first water-absorbing sheet (back sheet) 1
0 in the process D while continuously traveling in the length direction.
The hot-melt adhesive HM is applied and bonded while dropping the superabsorbent resin particles (SAP) 12. In the step E, the hot-melt adhesive HM is applied to the second water-absorbent sheet (top sheet) 11. Water-absorbing resin particles (SA
P) The absorbent sheet body 18 is adhered while sandwiching the 12
In step F, the perforated diffusion sheet 13 is joined to the absorbent sheet body 18 to form the water-absorbent sheet laminate 14.

Further, while continuously running the flap sheet 15 in the longitudinal direction, in step G, the flap elastic thread 16 is adhered to the inner edge portion 15a and the flap sheet body 17 is formed.
Is formed, and in step H, the outer edge portion 15b is adhered to the upper surface of both sides of the absorbent sheet laminate 14 to form the absorbent sheet laminate 3 with a flap.

Then, in step I, the cut absorbent piece 3 ′ of the flap-containing absorbent sheet laminate 3 is turned by 90 degrees with respect to the running direction to adhere to the exterior sheet laminate 2 that continuously travels in the length direction. In step K, a leg opening portion S is formed in the pants laminate 21, and in step K, the pants laminate 21 is folded in two to form a folded body 22. In the above, the folded body 11 is joined and cut to form a single pants body 24,
That is, the pants-type disposable diaper 1 can be completed.

As described above, each of the steps A to L can be performed while the first exterior sheet 4, the first water-absorbing sheet (back sheet) 10, the flap sheet 15 and the like are continuously driven in the length direction, so The pants-type disposable diaper 1 using the ultra-thin water-absorbent sheet body 18 using the water-absorbent resin particles 12 can be efficiently and continuously manufactured at high speed.

[0067]

As is clear from the above description, in the present invention, the step of forming the exterior sheet laminate and the step of forming the absorbent sheet laminate with flaps are performed at a high speed while continuously running in the length direction. Further, the cut absorbent piece of the absorbent sheet laminate with flap is turned by 90 degrees with respect to the running direction and joined to the exterior sheet laminate to form a pants laminate. The step of forming an opening for the leg, joining and cutting the folded body of the pants laminate to form a single pants body can be performed at a high speed while continuously running in the length direction, so that a highly water-absorbent resin A pants-type disposable diaper using an ultra-thin water-absorbing sheet using particles can be efficiently and continuously manufactured at high speed.

In the above step E, if the means for applying the hot melt adhesive applied to the second water-absorbing sheet is a curtain spray or a spiral spray (claim 2), a gap through which a liquid can pass can be reliably formed. be able to.

In the above step F, the sheet is a perforated diffusion sheet, and the peripheral wall of the hole of the perforated diffusion sheet is projected toward the upper surface side of the absorbent sheet body. If a void is formed between the diffusion sheet and the upper surface of the body (Claim 3), even if a relatively large amount of urine or the like is discharged at once, or even if urine or the like is repeatedly discharged, the diffusion sheet is formed. As a result, the discharged urine is quickly diffused, so that the absorption utilization rate of the entire absorbent sheet body is increased and the lateral leakage is reduced. In addition, since the perforated diffusion sheet has a large number of holes, the number of parts that come into contact with the skin surface of the wearer is reduced, so that the feeling of sliminess and stuffiness is reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of a continuous manufacturing method of a pants-type disposable diaper.

FIG. 2 is a configuration diagram of a continuous manufacturing method of a pants-type disposable diaper.

FIG. 3 is a view showing the formation of a line for an exterior sheet in a continuous production method of a pants-type disposable diaper.

FIG. 4 is a diagram illustrating the formation of a line for a water-absorbent sheet in a continuous method for producing a pants-type disposable diaper.

FIG. 5 is a pants-type disposable diaper, in which (a) is a plan view in an expanded state, and (b) is a front view in an assembled state.

FIG. 6 is an exploded perspective view of a pants-type disposable diaper.

7A is a cross-sectional view taken along line NN of FIG. 5, and FIG. 7B is a cross-sectional view of a main part of a modification.

8 (a) and 8 (b) are plan views of a state in which superabsorbent resin particles are bonded.

9A and 9B are perforated diffusion sheets. FIG. 9A is an enlarged plan view of a main part, and FIG. 9B is a cross-sectional view of FIG.

FIG. 10 is a sectional view of a modified example of the flap sheet body.

FIG. 11 (a) is an enlarged plan view of a curtain spray,
(B) is an enlarged plan view of the spiral spray.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 pants-type disposable diaper 2 exterior sheet laminate 3 water-absorbent sheet laminate with flap 3 ′ cut water-absorbent piece 4 first exterior sheet 5 second exterior sheet 6 elastic yarn for leg 7 elastic yarn for waist 10 first water-absorbent sheet 10 ′ Blocking sheet 11 Second water-absorbing sheet 12 Highly water-absorbing resin particles 13 Perforated diffusion sheet 13 'Top sheet 14 Water-absorbing sheet laminate 15 Flap sheet 16 Flap elastic thread 17 Flap sheet body 18 Water-absorbing sheet body 21 Pants body 22 Folding Body 23 Joint 24 Pants Body A-L Process S Leg Opening

Continuing on the front page (72) Inventor Kenji Nakaoka 89-1 Oyamakita, Ota, Sadamitsu-cho, Mima-gun, Tokushima Prefecture Inside the Toyoshima Saeki Co., Ltd.Tokushima Sadamitsu Plant (72) Inventor Masaru Fujioka Oyama-Kita, Sadamitsu-cho, Mima-gun, Tokushima Prefecture 89-1 Inside the Toyo Saiki Co., Ltd. Tokushima Sadamitsu Plant (72) The inventor Kazuyo Mori 81-1 Oyama-Kita, Ota-sha, Sadamitsu-cho, Mima-gun, Tokushima Prefecture Inside the Toyo Saiki Co., Ltd. Sadamitsu Tokushima Plant (72) The inventor Sachiko Tateiwa Tokushima 8-1 Koyamakita, Ota, Sadamitsu-cho, Mima-gun, F

Claims (3)

[Claims] 1. A step A of applying a hot melt adhesive to at least a center position and both side positions in a width direction of an upper surface of the first exterior sheet while continuously running the first exterior sheet in a length direction; 1 At the center position of the exterior sheet, a pair of elastic yarns for leg gathers in an extended state are adhered while drawing a sine curve that is line-symmetric in the width direction with respect to the running direction, and for a circular leg at a predetermined pitch. While forming the elastic part,
B step of forming a waist elastic portion by linearly adhering a pair of stretched waist elastic yarns in the running direction to the both side positions of the first exterior sheet, A step C of bonding the second exterior sheet with the elastic yarns interposed therebetween to form an exterior sheet laminate, and a first water-absorbing sheet narrower than the adjacent leg elastic portion of the exterior sheet laminate. A step D of applying a hot-melt adhesive to a predetermined position on the upper surface of the first water-absorbent sheet while continuously traveling in the length direction, and bonding the high-water-absorbent resin particles while dropping on the applied portion; A hot-melt adhesive is applied to the second water-absorbent sheet having substantially the same shape as that of the first water-absorbent sheet so as to form a gap through which liquid can pass, and the high-water-absorbent resin particles are adhered to the upper surface of the first water-absorbent sheet while being sandwiched therebetween. The absorption sea A step E of forming a body, a step F of forming a water-absorbent sheet laminate by partially bonding a sheet having the same shape as or smaller than the first and second water-absorbent sheets to the upper surface of the absorbent sheet body, A step G of forming a pair of flap sheet bodies by continuously adhering stretched flap elastic yarns to the inner edge of each flap sheet while continuously running the flap sheets in the longitudinal direction; A step H of bonding the outer edges to the upper surfaces of both sides of the absorbent sheet laminate to form an absorbent sheet laminate with a flap in a state in which the sheets are separated in the width direction of the absorbent sheet laminate; The absorbent sheet laminate is cut to a fixed length while maintaining the tension state, and the cut absorbent piece is turned by 90 degrees with respect to the traveling direction. Step joined to form a pant laminate between the leg elastic portion adjacent the top surface of the instrumentation sheet laminate I
Step J of forming a leg opening in the pants laminate
And a step K of folding the pants stack so that the cut absorber piece is on the inner surface side and forming a folded body with the longitudinal center line being a valley line, thereby forming a folded body. A step of joining the adjacent elastic portions for the leg in the width direction and cutting at an intermediate position of the joining portion to form a single pants body. Production method. 2. The continuous production method for a pants-type disposable diaper according to claim 1, wherein in step E, the means for applying the hot melt adhesive applied to the second water-absorbent sheet is a curtain spray or a spiral spray. 3. In the step F, the sheet is a perforated diffusion sheet, and a peripheral wall of a hole of the perforated diffusion sheet is protruded toward the upper surface of the absorbent sheet body. The continuous production method for a pants-type disposable diaper according to claim 1 or 2, wherein a gap is formed between the absorbent sheet body and the upper surface.