JP2010131079A - Method for producing waist belt and method for producing disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a waist belt which hardly generates waste during its production process. <P>SOLUTION: The method for producing the waist belt is provided which includes a step (A) in which an elastic sheet is acquired by attaching leg-surrounding elastic materials in a stretched condition along a longitudinal strip of sheet in such a way that the leg-surrounding elastic materials trace a waving track, a step (B) in which a first intermediate sheet having peak parts of the leg-surrounding elastic materials including one end of the elastic sheet in the lateral direction and a second intermediate sheet having peak parts of the leg-surrounding elastic materials including the other end are acquired by cutting regions of the elastic sheet where the leg-surrounding elastic materials are attached, a step (C) in which a laminate is acquired by laminating the first and the second intermediate sheets to place one end and the other end on the same side and to make the peak parts overlap with each other, a step (D) in which a bonded body is acquired by fixing predetermined parts of the first and second intermediate sheets with each other, and a step (E) in which the waist belt is acquired by cutting the bonded body in a predetermined shape. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a waist belt and a method for manufacturing a disposable diaper. More specifically, in addition to being easy to exchange, leaking excrement is less likely to occur, and the absorbent main body is difficult to shift laterally. The present invention relates to a waist belt manufacturing method and a disposable diaper manufacturing method that can manufacture a waist belt of a disposable diaper that does not easily bite into the crotch and that has a small amount of waste in the manufacturing process.

  Conventionally, as disposable diapers, tape-type diapers, pants-type diapers, and the like are known. Tape-type diapers have the advantage that they can be easily replaced when the wearer is in a sleeping position. Specifically, since the tape can be removed from the front body, after the diaper is deployed under the body, it is worn on the body according to the wearer's body shape and fastened to the front body. be able to. Such a tape-type diaper can be easily replaced when defecation occurs. That is, since it is possible to widen (deploy) the diaper during the replacement, it is easy to clean the heel part, and the problem that the heel part becomes dirty due to the diaper replacement is less likely to occur.

  The pants-type diaper has an advantage that it can be easily replaced when the wearer is in a standing posture. And general pants-type diapers have elasticity around the abdomen and are worn with the abdomen around. Since the pants-type diaper need only be worn with the abdomen around, the trouble of adjusting the tape according to the wearer's body shape is not required as in the case of a tape-type diaper. Therefore, pants-type diapers are preferred because they are easier to replace than tape-type diapers.

  However, since the tape-type diaper and the pants-type diaper are exchanged including, for example, a non-stained exterior part, a large amount is discarded and the cost is high. Then, the disposable diaper of the type which replaces only an absorptive main part is proposed as disposable diapers other than a tape type diaper and a pants type diaper (for example, refer to patent documents 1).

JP 2000-51273 A

  Since the disposable diaper of the type described in Patent Document 1 only needs to replace the absorbent main body after urine and feces are excreted, the amount of waste is reduced compared to a tape-type diaper or a pants-type diaper. And has the advantage of being economically inexpensive. Here, even if the disposable diaper described in Patent Document 1 is used, for example, when there is a bowel movement, it is efficient to replace the wearer in a sleeping position, and it is widely performed to replace it in a sleeping position. It has been broken. This is because cleaning of the buttocks and inseam is considered.

  When exchanging diapers in such a sleeping position, the disposable diaper described in Patent Document 1 has a narrow crotch width and a small rear body area. It sometimes spread as it leaked beyond the gathers.

  Moreover, the disposable diaper of the type described in Patent Document 1 has a problem that the absorbent main body is easily displaced in the lateral direction or easily bites into the crotch, which may cause leakage of urine, feces, and the like.

  The present invention has been made in view of such problems of the prior art, it is difficult to produce waste in the manufacturing process, is easy to replace, is difficult to leak excrement, the absorbent main body, The present invention provides a method for manufacturing a waist belt of a diaper and a method for manufacturing a disposable diaper that are difficult to shift in the crotch in addition to being difficult to shift in the lateral direction.

  According to this invention, the manufacturing method of the waist belt shown below and the manufacturing method of a disposable diaper are provided.

[1] A method for producing a waist belt for fixing an absorbent main body to a wearer's body, and an elastic material around a waist is attached to a belt-like long sheet in a stretched state along its longitudinal direction, (A) a step of obtaining a stretchable sheet by attaching a stretchable material around the leg so as to draw a wavy locus along the longitudinal direction of the long sheet, and the stretchable material around the leg of the stretchable sheet A first intermediate body that includes the one end edge in the short direction of the stretchable sheet and includes the top of the stretchable material around the leg, by cutting the attached region along the longitudinal direction of the stretchable sheet A step (B) of obtaining a second intermediate sheet including a sheet and the other end edge and having a top of the elastic material around the leg, the first intermediate sheet and the second intermediate sheet; The one edge and the other edge are the same side And (C) a step of obtaining a laminate by laminating the top and bottom of the elastic material around the legs so as to overlap each other, and passing through the top to the laminate along the short direction of the laminate And (D) a step of obtaining a joined body by forming a fixing portion for fixing the first intermediate sheet and the second intermediate sheet to each other, and passing the joined body through the top. (E) the process of obtaining along a transversal direction of a body, and obtaining a waist belt, The manufacturing method of a waist belt provided with.

[2] The trajectory for cutting the elastic sheet has the same wavelength and phase as the wavelength and phase of the wavy trajectory drawn by the leg-surrounding material, and the amplitude is the wavy shape drawn by the leg-surrounding material. The method for producing a waist belt according to [1], wherein the waist belt has a smaller wave shape than the amplitude of the trajectory.

[3] The waist belt according to [1] or [2], wherein the wavy trajectory drawn by the leg-surrounding elastic material and the wavy trajectory for cutting the elastic sheet are each in an S-curve shape. Manufacturing method.

[4] The waist belt manufacturing method according to [1], wherein the trajectory for cutting the stretchable sheet is linear.

[5] The elastic material around the legs has an attached portion attached to the long sheet and a non-attached portion other than the attached portion, and the non-attached portion is on a trajectory for cutting the elastic sheet. The manufacturing method of the waist belt in any one of said [1]-[4] located in.

[6] After obtaining the stretchable sheet, the method further comprises a step (F) of cutting a portion intersecting a trajectory for cutting the stretchable sheet, of the stretchable material around the legs of the stretchable sheet. ] The manufacturing method of the waist belt in any one of [5].

[7] The fixed portion includes a detachable first fixed portion and a non-detachable second fixed portion, and the joined body includes the first fixed portion and the fixed portion in the longitudinal direction. The method for manufacturing a waist belt according to any one of [1] to [6], wherein the second fixing portions are alternately arranged.

[8] An elastic material around the waist is attached to the belt-like long sheet in a stretched state along the longitudinal direction, and the elastic material around the legs is stretched to draw a wavy locus along the longitudinal direction of the long sheet. (G) step of attaching in a state to obtain an elastic sheet, and cutting the region of the elastic sheet where the elastic material around the legs is attached along the longitudinal direction of the elastic sheet, A first intermediate sheet including one end edge in a short direction of the sheet and having a top of the elastic material around the leg; and a second intermediate sheet including the other edge and having a top of the elastic material around the leg (H) step of obtaining an intermediate sheet of the above, an absorber, a top sheet that is arranged so as to cover the surface of the absorber, and at least a part of which is made of a liquid-permeable material, and covers the back surface of the absorber Made of liquid-impermeable material The both ends in the longitudinal direction of the absorbent main body having the front and rear seats are respectively disposed between the leg stretchable members adjacent to the first intermediate sheet and the second intermediate sheet, and are fixed and absorbable. Obtaining the main body fixing body (I), bending the absorbent main body fixing body so that the absorbent main body is located on the inside, and the first intermediate sheet and the second intermediate sheet, (J) a step of obtaining a laminated body for diapers in which one end edge and the other end edge are positioned on the same side and are laminated so that the tops of the leg-stretchable materials overlap each other; and the diaper A diaper is formed in the laminate for use by forming a fixing portion for fixing the first intermediate sheet and the second intermediate sheet to each other along the transversal direction of the diaper laminate through the top. (K) process of obtaining a bonded body for use, and the diaper A joined body is cut along the short direction of the joined body for diapers through the top to obtain a disposable diaper having a waist belt and the absorbent main body fixed to the waist belt (L ) Process, and the manufacturing method of a disposable diaper.

[9] The trajectory for cutting the stretchable sheet has the same wavelength and phase as the wavelength and phase of the wavy trajectory drawn by the leg-surrounding material, and the amplitude is the wavy shape drawn by the leg-surrounding material. The method for manufacturing a disposable diaper according to the above [8], which has a wave shape smaller than the amplitude of the trajectory.

[10] The disposable diaper according to [8] or [9], wherein the wavy trajectory drawn by the leg-surrounding elastic material and the wavy trajectory for cutting the elastic sheet are each in an S-curve shape. Manufacturing method.

  The manufacturing method of the waist belt of the present invention produces a waist belt of a disposable diaper that is easy to replace, is less likely to cause excrement leakage, and the absorbent main body is difficult to shift laterally, and is difficult to bite into the crotch. This has the effect of reducing the amount of waste in the manufacturing process.

  The manufacturing method of the disposable diaper of the present invention is easy to replace, is less likely to cause excrement leakage, the absorbent main body is difficult to shift in the lateral direction, in addition to manufacturing a disposable diaper that is difficult to bite into the crotch This produces an effect that the amount of waste in the manufacturing process is small.

  Hereinafter, the best mode for carrying out the present invention will be described, but the present invention is not limited to the following embodiment. That is, it is understood that modifications and improvements as appropriate to the following embodiments are also within the scope of the present invention based on ordinary knowledge of those skilled in the art without departing from the spirit of the present invention. Should be.

[1] Manufacturing method of waist belt:
The manufacturing method of the waist belt of this invention is a method of manufacturing the waist belt for fixing an absorptive main body to a wearer's body, and is provided with the following (A) process-(E) process.

  That is, an elastic material around the waist is attached in a stretched state along the longitudinal direction of the belt-like long sheet, and the elastic material around the legs is stretched so as to draw a wavy locus along the longitudinal direction of the long sheet. Attaching and obtaining a stretchable sheet (A), and cutting the region of the stretchable sheet where the stretch material around the legs is attached along the longitudinal direction of the stretchable sheet, A first intermediate sheet including one end edge and having the top of the elastic material around the leg and a second intermediate sheet including the other edge and having the top of the elastic material around the leg are obtained (B ) And the first intermediate sheet and the second intermediate sheet are laminated so that one end edge and the other end edge are located on the same side, and the tops of the elastic members around the legs overlap each other. Step (C) to obtain a laminate, and to the obtained laminate, (D) a step of obtaining a joined body by forming a fixing portion for fixing the first intermediate sheet and the second intermediate sheet to each other along the short direction of the laminate through the section; And (E) step of obtaining a waist belt by cutting along the short direction of the joined body through the top.

  By such a process, waste in the manufacturing process is hardly generated, exchange is easy, leakage of excrement is difficult to occur, and the absorbent main body is difficult to shift laterally, and the waist belt that does not easily bite into the crotch. Can be manufactured.

  The waist belt manufactured by the manufacturing method of the waist belt of this invention is for fixing an absorptive main body to a wearer's body. By fixing the absorptive main body to the waist belt, it can be used as a diaper for infants or adults such as elderly people and disabled persons who need nursing care. In addition, the waist belt manufactured by the manufacturing method of the waist belt of the present invention can be used as it is after fixing the absorbent main body to the wearer, or after fixing the absorbent main body, the pants-type diaper from above Or a tape-type diaper can be used.

[1-1] Step (A):
(A) In the step, the elastic material around the waist is attached to the belt-like long sheet in a stretched state along the longitudinal direction, and the elastic material around the leg is drawn so as to draw a wavy locus along the longitudinal direction of the long sheet. Is a step of attaching a stretched sheet to obtain an elastic sheet. By such a process, it is only necessary to attach the elastic material around the waist while extending it in the flow direction (longitudinal direction) of the long sheet, so it is possible to attach the elastic material around the waist freely. There is an advantage of being.

  FIG. 1 shows that a belt-like long sheet 11 is provided with an elastic material 12 around the waist along its longitudinal direction in a stretched state, and stretches around the legs so as to draw a wavy locus along the longitudinal direction of the long sheet 11. The example which attached the material 13a in the expansion | extension state is shown. 1 to 24, common constituent elements are denoted by the same reference numerals.

[1-1-1] Long sheet:
The long sheet is preferably made of a non-woven fabric. Examples of the non-woven fabric include a dry non-woven fabric and a wet non-woven fabric made of a thermoplastic resin such as polyethylene, polypropylene, and polyester. Specific examples include spunbond, SMS, and air-through nonwoven fabric. Among these, spunbond can be suitably used because of its high strength. Moreover, since an air through nonwoven fabric is excellent in a touch feeling, it is preferable to use it as a material for the surface (outside) of the belt-like body.

  The length of the long sheet in the short direction (width of the long sheet) is appropriately set depending on whether the wearer is an adult, a child, or an intermediate size called a so-called middle man. Is possible. For example, in the case of an adult waist belt, the width is preferably 300 to 700 mm, more preferably 350 to 500 mm.

[1-1-2] Elastic material around waist:
The elastic material around the waist is attached in a stretched state along the longitudinal direction of the long sheet. In addition to the both ends of the long sheet and the both ends, the attachment position of the elastic material around the waist is in the vicinity of the middle portion (that is, all or one of the portions corresponding to the circumference of the lower abdomen of the wearer). Part). By attaching this elastic material around the waist, it is possible to form a gather (waist gather) rich in elasticity in the waist opening. And by this waist gathers, when a diaper is worn, it becomes difficult to form a gap around the waist, and urine leakage from around the waist can be prevented. Moreover, the fitting property of a diaper becomes favorable and the fall of a diaper is prevented.

  As the elastic material around the waist, the same elastic material used for conventional disposable diapers can be suitably used. Specifically, a flat rubber made of natural rubber, a thread rubber made of an elastic thread of synthetic rubber (urethane rubber, etc.), a stretchable net, a stretchable film, and the like can be given.

  As the stretched state of the elastic material around the waist, for example, when the stretchable material is a flat rubber made of natural rubber or a thread rubber made of an elastic thread of synthetic rubber, the stretch rate is preferably 120 to 400%. More preferably, the elongation is ˜300%. When the stretching rate is in such a range, a sufficient stretching force can be applied to the wearer without applying an excessive tightening force.

  Examples of a method for attaching the elastic material around the waist include a hot melt adhesive, other highly fluid adhesives, a heat sealing method such as heat sealing, and a method using welding using ultrasonic waves.

[1-1-3] Leg elastic material:
The leg-surrounding stretchable material is attached to the long sheet in a stretched state so as to draw a wavy trajectory along the longitudinal direction thereof, and is a stretchable material disposed at a site corresponding to the wearer's leg circumference. By disposing the leg stretchable material, a gather (leg gather) rich in stretchability can be formed in the leg circumference opening of the diaper. Therefore, it is difficult to form a gap around the leg, and urine leakage from the opening around the leg can be effectively prevented. Further, when the leg stretchable material is disposed, the leg stretchable material contracts on both sides of the absorbent main body when changing the diaper, so that the vicinity of the crotch portion is deformed into a bowl shape and a recess is formed. For this reason, urine and body fluid accumulate in the concave portion, and the diaper can be easily replaced without spilling urine and body fluid.

  As the leg stretchable material, the same stretchable material as the waist stretchable material can be used. Further, the leg-surrounding stretchable material can be attached in the same stretched state as the waistline stretchable material, and the attachment method can also be the same method as the waistline stretchable material.

  According to the method for producing a waist belt of the present invention, a waist belt in which leg-stretchable members are attached around both legs can be easily obtained. Moreover, the shape of the leg periphery opening part of a waist belt can be determined by selecting the locus | trajectory which cut | disconnects an elastic sheet suitably.

  In addition, by cutting a predetermined position of the elastic sheet, it is possible to distribute the elastic material around the legs to the first intermediate sheet and the second intermediate sheet, and around the legs to fix the absorbent main body A waist belt without an elastic material such as an elastic material can be obtained. As described above, the waist belt is preferably flat without wrinkles or creases at the portion where the absorbent main body is fixed. If the part to which the absorbent main body is fixed is flat, it is easy to fix the absorbent main body, and it is difficult to form a gap between the absorbent main body and the waist belt, so that leakage from the gap can be prevented. .

  Furthermore, the manufacturing method of the waist belt of the present invention does not require a step of punching a sheet and making a hole like a conventional pant-type diaper when forming the opening around the leg. Trim is unlikely to occur. Therefore, waste of raw materials can be reduced and the amount of waste can be reduced.

  Here, the wavy locus drawn by the leg-stretchable material is not particularly limited as long as it is wavy, and examples thereof include a sine wave, a rectangular wave shape, a triangular wave shape, an S-curve shape, and a trapezoidal shape (substantially rectangular wave shape). be able to. As shown in FIG. 1, the leg stretchable material may be attached so as not to overlap the waist stretchable material, or a trajectory having an amplitude larger than the amplitude of the trajectory X1 shown in FIG. You may attach so that an elastic material around a waist may overlap.

  Specifically, the amplitude is preferably 10 to 80%, and more preferably 20 to 40%, with respect to the length in the width direction of the long sheet. If the amplitude is less than 10%, the leg opening may be cramped. On the other hand, if it is more than 80%, the leg opening is wide (so-called high leg state), so that the fixability of the absorbent main body may be deteriorated.

  The wavelength can be appropriately set depending on whether the wearer is an adult, a child, or an intermediate size called a so-called middle man. In the case of a waist belt, it is preferably 300 to 1000 mm, and more preferably 400 to 600 mm.

  For example, FIG. 1 is an example showing a leg-surrounding elastic member 13a provided with an S-curved locus X1. Moreover, FIG. 14 is an example which shows the leg periphery expansion-contraction material 13b provided with the locus | trajectory X2 of sine wave shape.

  In addition, the number of leg-around elastic members to be attached may be one or plural. In the case where a plurality of leg elastic members are attached, the wavy trajectory drawn by the leg elastic members may be the same or different as long as the effects of the present invention are achieved. For example, FIG. 18 shows an example in which two leg-surrounding elastic members 13b are attached with the same wavy locus (sine wave locus X2).

  The leg-around elastic member has an attached part attached to the long sheet and a non-attached part other than the attached part, and the non-attached part is preferably located on a trajectory for cutting the elastic sheet. . When the elastic material around the legs is attached in this way, when the elastic sheet is cut, the elastic material around the legs enters the intermediate sheet due to its contraction force, so that the intermediate sheet is pulled by the elastic material around the legs. Can be prevented. If the intermediate sheet is pulled, a gap may be formed around the leg or the leg may be easily turned over, which may cause leakage and poor appearance.

[1-2] Step (B):
The step (B) includes cutting one end of the elastic sheet along the longitudinal direction of the elastic sheet, including one end edge in the short direction of the elastic sheet, It is a step of obtaining a first intermediate sheet having a top of the surrounding elastic material and a second intermediate sheet including the other end edge and having the top of the elastic material around the leg.

  In the present specification, the “region to which the leg-surrounding stretchable material is attached” refers to a region between the maximum widths of the leg-surrounding stretchable material attached by a wavy locus (ie, a region indicated by reference numeral 17 in FIG. 1, for example). Of the elastic material 13a around the leg, the portion (vertex) closest to one end edge 21 in the short direction of the elastic sheet 15 and the other end edge 22 in the short direction of the elastic sheet 15 are closest. (Region between vertices). By cutting the stretchable sheet in the region where the leg stretchable material is attached, the leg stretchable material is disposed in each of the obtained first intermediate sheet and second intermediate sheet. . In this way, when the elastic sheet is cut in the longitudinal direction to produce two intermediate sheets and a waist belt is produced from these intermediate sheets, trim (ie, discarded portion) is difficult to occur. There is an advantage that the (elastic sheet) is not easily wasted. Moreover, since there is one cutting line, there is an advantage that it is easy to apply pressure to the cutting blade that breaks the stretchable sheet and it is difficult for cutting defects to occur.

  The trajectory for cutting the stretchable sheet is not particularly limited, and examples thereof include a straight line shape, a sine wave shape, a rectangular wave shape, a triangular wave shape, an S-curve shape, and a trapezoidal shape (substantially rectangular wave shape). Further, the trajectory for cutting the stretchable sheet may be cut with a finer (and smaller amplitude) wavy trajectory that swings left and right around the base line, with the trajectory exemplified above as a base line. . That is, even if a wavy locus having a small amplitude is meandered, it is macroscopically a wavy locus such as a linear shape, a sine wave shape, a rectangular wave shape, a triangular wave shape, an S-curve shape, or a trapezoidal shape (substantially rectangular wave shape). Good. With such a trajectory, the skin contact of the cut surface becomes good.

  In the waist belt manufacturing method of the present invention, the trajectory for cutting the stretchable sheet determines the shape of the edge of the leg-hole opening. The trajectory for cutting the stretchable sheet has the same wavelength and phase as the wavelength and phase of the wavy trajectory of the leg stretchable material, and the amplitude is smaller than the amplitude of the wavy trajectory of the leg stretchable material. It is preferable that the wavy trajectory drawn by the leg-stretchable material and the wavy trajectory for cutting the stretchable sheet are more preferably S-curve shapes. For example, FIG. 1 shows an example in which the wavy trajectory X1 drawn by the leg-surrounding elastic material 13a and the wavy trajectory Y1 cutting the elastic sheet 15 are S-curve shapes. If the wavy trajectory drawn by the elastic material around the legs and the wavy trajectory for cutting the elastic sheet are respectively S-shaped, there is an advantage that cutting is difficult to occur because the cutting blade hits continuously. . Further, as shown in FIG. 5, since the leg opening is a curve when viewed from the front, the S-shaped curve along the shape of the curved leg opening has the advantage that the fit is good. is there.

  The trajectory for cutting the stretchable sheet is preferably linear. In this way, the waist belt covers the thigh from the base of the wearer's leg, so that even a wearer familiar with trunks feels uncomfortable when wearing a diaper. There is an advantage that it becomes difficult. For example, FIG. 7 shows an example in which the locus Y2 for cutting the stretchable sheet 15 is linear.

  FIG. 1 shows an example in which a region 17 provided with a leg-surround stretchable material 13a in the stretchable sheet 15 is cut along an S-curved locus Y1 along the longitudinal direction of the stretchable sheet 15. FIG. 2 shows a first intermediate sheet 25 and a second intermediate sheet 26 obtained by cutting the elastic sheet. The first intermediate sheet 25 is a short sheet of the elastic sheet. Including one end edge 21 in the direction and having the top 18 of the leg-surrounding stretch 13a, and the second intermediate sheet 26 including the other end 22 and covering the top 18 of the leg-surrounding stretch 13a. Have. FIG. 7 shows an example in which the region 17 provided with the leg-surrounding elastic material 13a of the elastic sheet 15 is cut along a linear locus Y2 along the longitudinal direction of the elastic sheet 15. FIG. 8 shows a first intermediate sheet 25 and a second intermediate sheet 26 obtained by cutting the elastic sheet. The first intermediate sheet 25 is a short sheet of the elastic sheet. Including one end edge 21 in the direction and having the top 18 of the leg-surrounding stretch 13a, and the second intermediate sheet 26 including the other end 22 and covering the top 18 of the leg-surrounding stretch 13a. Have.

  FIG. 15 is a cross-sectional view of the stretchable sheet 15 provided with the leg stretchable material 13b along the longitudinal direction of the stretchable sheet 15 along a triangular wave locus Y3. The example which obtains the 2nd intermediate body sheet 26 is shown. The first intermediate sheet 25 includes one end edge 21 in the short direction of the stretchable sheet 15 and has a top 18 of a leg-surround stretchable material 13a, and the second intermediate sheet 26 It includes an end edge 22 and has a top 18 of a leg-surrounding elastic member 13a.

[1-3] Step (C):
In step (C), the first intermediate sheet and the second intermediate sheet are arranged such that one end edge and the other end edge are located on the same side, and the tops of the leg-around elastic members overlap each other. It is the process of making it laminate | stack and obtaining a laminated body. “The tops of the leg elastics overlap” means that the leg elastics attached to the first intermediate sheet and the leg elastics attached to the second intermediate sheet It means that each top part overlaps each other. The widths of the first intermediate sheet and the second intermediate sheet are preferably the same, but may be different. Further, when one end and the other end are positioned on the same side, it is preferable to align the respective ends, but they may be in a shifted state (not necessarily aligned). By forming the laminated body in this manner, a waist belt (diaper) in which gathers (leg gathers) are formed in the openings around the legs can be easily manufactured.

  As a method of laminating the first intermediate sheet and the second intermediate sheet, for example, one of the first intermediate sheet and the second intermediate sheet may be folded and overlapped on the other, One of the first intermediate sheet and the second intermediate sheet may be rotated by 180 ° on the plane and then overlapped on the other. Further, after cutting the elastic sheet, it is necessary to move at least one of the first intermediate sheet and the second intermediate sheet in the longitudinal direction in order to overlap the tops of the elastic members around the legs. However, the amount (distance) to be moved is not particularly limited as long as the tops of the elastic members around the legs overlap. For example, in the case where an elastic material around the legs is attached with an S-curved locus as shown in FIG. 1, for example, one of the first intermediate sheet and the second intermediate sheet is attached to the above-mentioned leg elastic material. The half-wavelength of the S-shaped curve locus may be moved, or may be moved by 1.5 wavelengths.

  For example, FIG. 3 is an example showing a laminated body 41 obtained by laminating the first intermediate sheet 25 and the second intermediate sheet 26 shown in FIG. 2, and the laminated body 41 is a first intermediate sheet. The one end edge 21 of the body sheet 25 and the other end edge 22 of the second intermediate sheet 26 are located on the same side, and the top 18 of the first intermediate sheet 25 and the second intermediate sheet 25 The first intermediate sheet 25 and the second intermediate sheet 26 are arranged so that the top portions 18 of the 26 overlap. That is, in order to obtain this laminate 41, first, as shown in FIG. 1, after the elastic sheet 15 is cut, the second intermediate sheet 26 is placed around the legs in the longitudinal direction. The first intermediate sheet 25 and the second intermediate sheet 26 are arranged as shown in FIG. 2 while being moved by the half wavelength of the elastic material 13a (the wavy locus X1). Next, the second intermediate sheet 26 is laminated on the first intermediate sheet 25 by folding the second intermediate sheet 26 toward the first intermediate sheet 25 side. In this way, the laminate 41 can be obtained.

  FIG. 9 shows the first intermediate sheet 25 and the second intermediate sheet 26 shown in FIG. 8, with one end edge 21 and the other end edge 22 positioned on the same side, and the leg-surrounding elastic member 13a. It is an example which shows the laminated body 41 obtained by laminating | stacking so that the top parts 18 may overlap.

  FIG. 16 shows the first intermediate sheet 25 and the second intermediate sheet 26 cut by cutting the stretchable sheet 15 as shown in FIG. In the figure, an example is shown in which the leg-surrounding elastic member 13b (wave-like locus X2) is moved by a half wavelength.

  FIG. 20 shows the first intermediate sheet 25 and the second intermediate sheet 26 cut by cutting the stretchable sheet 15 as shown in FIG. In the figure, an example is shown in which the leg-surrounding elastic member 13b (wave-like locus X2) is moved by a half wavelength.

  In addition, in order to overlap the tops of the elastic materials around the legs, as shown in FIGS. 16 and 20, after moving either (or both) the first intermediate sheet and the second intermediate sheet, The first intermediate sheet and the second intermediate sheet may be stacked, and then either (or both) the first intermediate sheet and the second intermediate sheet may be moved. Also good.

[1-4] Step (D):
(D) A process forms the fixing | fixed part which mutually fixes a 1st intermediate body sheet and a 2nd intermediate body sheet in a laminated body along the transversal direction of a laminated body through a top part, and is joined. It is the process of obtaining.

  The fixing unit may fix the first intermediate sheet and the second intermediate sheet so as not to be detachable or may be detachably fixed. Further, all of the fixing portions may be detachable or detachable. Furthermore, a part may be detachable and the remaining part may be detachable. The non-removable fixing portion can be formed by, for example, a hot melt adhesive, other highly fluid adhesive, a heat sealing method such as heat sealing, a method using welding using ultrasonic waves, or the like. The detachable fixing portion can be formed by, for example, a mechanical fastener including a hook material and a loop material, an adhesive tape system including an adhesive tape and a receiving portion thereof, and the like.

  In the waist belt manufacturing method of the present invention, the fixed portion of the joined body preferably has a detachable first fixed portion and a non-detachable second fixed portion. It is preferable that the first fixing portion and the second fixing portion are alternately arranged in the longitudinal direction. As described above, when the first fixing portion and the second fixing portion are alternately arranged, the obtained waist belt becomes a fixing portion (first fixing portion) in which either the left or right fixing portion is removable, One side of the waist belt can be opened, and the waist belt can be easily attached and detached.

  For example, in FIG. 4, the first intermediate sheet 25 and the first intermediate sheet 25 pass through the apex 18 of the elastic material 13 a around the legs from the one edge in the short direction of the joined body to the other edge by heat sealing. It is an example which shows the joining body 33 in which the fixing | fixed part 31 which fixes the 2nd intermediate body sheet 26 mutually was formed. Further, FIG. 10 shows that the first intermediate sheet 25 and the second intermediate sheet 26 are directed from the top 18 of the leg-surrounding elastic member 13a toward one edge in the short direction of the joined body by heat sealing. It is an example which shows the conjugate | zygote 33 which formed the fixing | fixed part 31 which fixes each other.

  The fixed part of the joined body is not particularly limited as long as it passes through the top of the leg-stretchable elastic material and extends along the short direction of the laminated body. Like the joined body 33 shown in FIG. 10 may be formed from one edge in the short direction to the other edge, and one edge and the other in the short direction of the joined body 33 as in the joined body 33 shown in FIG. It may be formed in a part between the edges.

[1-5] Step (E):
The step (E) is a step of obtaining a waist belt by cutting the joined body along the short direction of the joined body through the top.

  FIG. 5 shows an example of the waist belt 10a obtained by cutting the joined body 33 shown in FIG. 4 along the short side direction of the joined body 33 through the top 18. The waist belt 10a has a cylindrical shape with both side portions fixed by fixing portions 31, and includes an abdomen seat 35 and a back seat, and the waist elastic member 12 is attached to the waist opening 44, and the leg A leg-surrounding elastic member 13 a is attached to the surrounding opening 45. FIG. 11 is an example showing a waist belt 10b obtained by cutting the joined body 33 shown in FIG. 10 along the short direction of the joined body 33 through the top portion 18. The waist belt 10b has a cylindrical shape with both side portions fixed by a fixing portion 31 and provided with an abdominal seat 35 and a back seat. A leg-surrounding elastic member 13 a is attached to the surrounding opening 45.

  FIG. 17 is an example showing a waist belt 10c obtained by cutting the joined body 33 along the short direction of the joined body 33 through the top 18 of the leg-surrounding elastic member 13b. FIG. 21 shows an example of the waist belt 10d obtained by cutting the joined body 33 along the short direction of the joined body 33 through the apex portion 18 of the leg-surrounding elastic member 13b.

[1-6] Step (F):
The waist belt manufacturing method of the present invention further includes a step (F) of cutting a portion that intersects a trajectory for cutting the elastic sheet, out of the elastic material around the legs of the elastic sheet, after obtaining the elastic sheet. be able to. By providing this step, the stretchability of the stretchable material is not expressed at the cut end portion of the cut contractible sheet, so that the pulling is prevented. Specific examples of the method for cutting the leg-stretchable material include fine pattern embossing, cutting with a cutter, cutting with pressure and / or heating, and the like. When cutting the elastic material around the legs, be careful not to cut the elastic sheet.

  For example, FIG. 12 assumes that the elastic sheet 15 is cut along a linear locus Y2, and a portion of the elastic material 13a around the leg of the elastic sheet 15 that intersects the linear locus Y2 is cut by a cutting roller. It is an example which shows the cut | disconnected elastic sheet 15. FIG.

[1-7] Shrinkage region and non-shrinkage region:
The waist belt manufactured by the method for manufacturing a waist belt of the present invention preferably has a contracted region contracted by a waist elastic member and a leg elastic member and a non-contracted region other than the contracted region. Thus, when it has a non-shrink area | region, when an absorptive main body is fixed to this non-shrink area | region, there exists an advantage that an absorptive main body is stably fixed to a waist belt. Furthermore, there is an advantage that excrement can be prevented from leaking because a gap is hardly formed between the absorbent main body and the waist belt. Moreover, since the degree of wrinkles formed in the absorbent main body can be reduced, it is preferable in terms of appearance in addition to being comfortable to wear. For these reasons, it is preferable that the non-shrinkable region is formed in a portion where the absorbent main body can be fixed.

  The non-shrinkable region is obtained by, for example, obtaining a stretchable sheet in which a stretchable material around the waist and a stretchable material around the leg are attached in a stretched state, and then a predetermined portion of the stretchable material around the waist and the stretchable material around the leg of the stretchable sheet. It can be formed by cutting with a cutting roll or the like. Further, the non-shrinkable region can also be formed in the portion that should be the non-shrinkable region by not attaching the waist stretchable material and the leg stretchable material.

  The non-shrink region may be formed in any step of the steps (B) to (E) in addition to the method of forming in the step (A) as described above. For example, after obtaining a first intermediate sheet and a second intermediate sheet, a non-shrinkable region may be formed by cutting predetermined portions of the obtained sheets with a cutting roll or the like.

[1-8] Broken part:
As for the waist belt manufactured by the manufacturing method of the waist belt of this invention, it is preferable that the fracture | rupture part which can fracture | rupture a waist belt is formed in the sheet | seat (belt side sheet | seat) located in a wearer's stomach side. When the rupture portion is formed, the disposable diaper can be easily removed by rupturing the rupture portion. Therefore, there is an advantage that it takes less time to replace the disposable diaper.

  Examples of the fracture portion include a perforation and an adhesion portion. Here, the bonding part is a part of two or more sheet pieces for constituting the ventral sheet, and the overlapping part is bonded by a method such as heat sealing or ultrasonic sealing to ventral side It refers to the adhesive part when the sheet is constructed.

  For example, FIG. 1 shows an example in which a perforation (breaking portion) 37 is formed at a predetermined position of the stretchable sheet 15 so that a breaking portion is formed on the ventral sheet of the waist belt.

  In addition, instead of forming with two or more sheet pieces for constituting the ventral sheet, the adhesive force of the fixing portion that fixes the first intermediate sheet and the second intermediate sheet to each other is peeled off. This fixing part can be used as an adhesion part (breaking part) by fixing with a force that is possible.

  The perforation (breaking part) may be formed in a long sheet in advance, or after obtaining an elastic sheet in which the elastic material around the waist and the elastic material around the leg are attached in an extended state, this elastic sheet Alternatively, it may be formed by a breaking roll or the like. Furthermore, in addition to the forming method as described above, it may be formed in other steps.

[1-9] Concave and convex portions:
The waist belt manufactured by the method for manufacturing a waist belt according to the present invention has, on its inner surface, at least one of a recess recessed in the thickness direction of the waist belt and a protrusion protruding in the thickness direction of the waist belt is formed. It is preferable that

  If at least one of these concave and convex portions is formed, the contact area between the wearer's skin and the waist belt is reduced, preventing skin troubles such as rashes even when worn for a long time. There is an advantage that you can.

  The cross-sectional shape of the recess perpendicular to the thickness direction of the waist belt may be, for example, a circle, an ellipse, a triangle, a quadrangle, or a polygon. Further, the recess may be a groove.

  The manufacturing method of the waist belt of the present invention may use a belt-like long sheet in which concave portions are formed in advance. The long sheet in which the concave portion is formed can be formed by embossing the long sheet. Moreover, it can also produce by laminating | stacking other sheet-like nonwoven fabrics which have a through-hole on one sheet-like nonwoven fabric which does not have a through-hole.

  Examples of the shape of the convex portion include a hemispherical shape, a cylindrical shape, a cubic shape, and a polygonal column shape. Further, for example, when the convex portion is formed by a columnar body such as a quadrangular column, the columnar body may be arranged such that the central axis in the longitudinal direction is parallel to the inner surface of the waist belt, or becomes vertical. It may be arranged as follows.

  It is preferable to form a recessed part and a convex part in the sheet | seat (back side sheet | seat) located in a wearer's back side. In the sitting position, the back seat is sandwiched between the back of the chair or wheelchair and the wearer, and is often pinched between the bedding and the wearer during sleep. It is easy to sweat on the seat side (back side). Therefore, if a gap is formed between the skin and the back sheet by forming a recess or a protrusion on the back sheet, it becomes difficult to sweat and skin troubles can be reduced.

  Although the said recessed part and a convex part may be previously formed in a elongate sheet as mentioned above, you may form in any process of (B)-(E) processes. For example, after obtaining a first intermediate sheet and a second intermediate sheet, a recess may be formed by embossing predetermined portions of the first intermediate sheet and the second intermediate sheet. it can.

[1-10] Through hole:
The waist belt manufactured by the method for manufacturing a waist belt according to the present invention preferably has a through hole. By forming the through hole, there is an advantage that the breathability of the waist belt can be improved. That is, even when worn for a long time, it is difficult to get stuffy, and skin troubles such as scabs can be prevented.

  Examples of the shape of the through hole include a circle, an ellipse, a triangle, a quadrangle, and a polygon.

  FIG. 13 shows an example in which a plurality of through holes 39 are formed at predetermined positions of the stretchable sheet 15 so that a plurality of through holes are formed in the ventral side seat and the back side seat of the waist belt.

  The waist belt manufacturing method of the present invention can use a long sheet in which through holes are formed in advance. That is, a through hole is formed at a predetermined position of a belt-like long sheet by a conventional method for making a through hole in a nonwoven fabric, and a waist sheet stretchable material and a leg stretchable area are formed on the long sheet in which the through hole is formed. A stretchable sheet can be obtained by attaching the material in a stretched state. Examples of a conventional method for making a through hole in a nonwoven fabric include methods such as a hot needle, an emboss roll, hot air, and a water jet.

  In addition, although the said through-hole may be formed in the (A) process as mentioned above, you may form in any process of the (B)-(E) process.

  In addition, although it is preferable to perform the manufacturing method of the waist belt of this invention in order of (A)-(F) process, there is no restriction | limiting in particular in the order which performs each process. For example, after obtaining the laminated body by the step (C), the laminated body passes through the top of the elastic material around the legs and is cut along the short direction thereof, and is substantially composed of a front sheet and a rear sheet. You may perform the process of obtaining a waist belt by performing the process of obtaining a strip | belt-shaped unjoined sheet | seat, fixing at least one part of the both ends of the longitudinal direction of the obtained unjoined sheet, and forming a fixing | fixed part.

[2] Disposable diaper manufacturing method:
The manufacturing method of the disposable diaper of this invention is equipped with each process of the following (G) processes-(L) processes.

  That is, an elastic material around the waist is attached to the belt-like long sheet in a stretched state along the longitudinal direction thereof, and the elastic material around the legs is stretched so as to draw a wavy locus along the longitudinal direction of the long sheet. Attaching (G) the step of obtaining an elastic sheet, and cutting the region of the elastic sheet where the elastic material around the legs is attached along the longitudinal direction of the elastic sheet, A first intermediate sheet including one end edge and having a top part of the elastic material around the leg and a second intermediate sheet including the other edge and having the top part of the elastic material around the leg are obtained (H ) Step, an absorber, and a top sheet that is arranged to cover the surface of the absorber, at least part of which is made of a liquid-permeable material, and a back surface of the absorber that is liquid-impermeable Absorbent body having a back sheet made of a functional material (I) a step in which both ends in the longitudinal direction are respectively arranged between the first intermediate sheet and the leg-around elastic material adjacent to the second intermediate sheet and fixed to obtain an absorbent main body fixing body. It is equipped with.

  Further, the absorbent main body fixing body is folded so that the absorbent main body is located on the inner side, and the first intermediate sheet and the second intermediate sheet are the same on one edge and the other edge. (J) step of obtaining a laminated body for diapers by being laminated so that the tops of the elastic members around the legs overlap with each other, and passing through the top and along the short direction of the laminated body for diapers (K) process which forms the fixing | fixed part which fixes a 1st intermediate sheet and a 2nd intermediate sheet mutually, and obtains the joined body for diapers, and joins a joined diaper for a diaper while passing a top part. (L) process which cuts along the transversal direction of a body, and obtains the disposable diaper which has a waist belt and an absorptive main part fixed to this waist belt.

  Such a process makes it difficult to produce waste in the manufacturing process, is easy to replace, is difficult to cause excrement leakage, and the absorbent main body is difficult to shift laterally, and is difficult to bite into the crotch. Can be manufactured.

  FIG. 6 is a front view showing a disposable diaper 100 manufactured by one embodiment of the method for manufacturing a disposable diaper of the present invention, and the disposable diaper 100 shown in FIG. 6 is manufactured by the method for manufacturing a waist belt of the present invention. A waist belt 10a, and an absorbent main body 42 fixed to the inside of the waist belt 10a. The waist belt 10a has a cylindrical shape with both side portions fixed by the fixing portions 31 and provided with an abdominal side seat 35 and a back side seat, and the waist circumference elastic member 12 is attached to the waist circumference opening 44. The leg-surrounding elastic member 13a is attached to the leg-surrounding opening 45. The ventral sheet 35 is formed with perforations 37 that allow the ventral sheet 35 to be broken.

[2-1] Step (G), Step (H):
The steps (G) and (H) of the method for manufacturing a disposable diaper of the present invention can employ the same steps as the steps (A) and (B) of the method for manufacturing a waist belt of the present invention, respectively. .

  Therefore, in step (H), the trajectory for cutting the stretchable sheet has the same wavelength and phase as the wavelength and phase of the wavy trajectory of the leg-surrounding elastic material, and the amplitude is the wave trajectory of the leg-surrounding elastic material. It is preferable to have a wave shape smaller than the amplitude, and it is more preferable that the wave-like trajectory drawn by the leg-stretchable material and the wave-like trajectory for cutting the stretchable sheet each have an S-curve shape. If the wavy trajectory drawn by the leg elastics and the wavy trajectory that cuts the elastic sheet satisfy the above conditions, the leg openings and leg elastics fit around the wearer's legs. There is an advantage that it becomes easy.

[2-2] Step (I):
(I) A process is arrange | positioned so that the absorber and the surface of this absorber may be coat | covered, the top sheet which consists of a liquid-permeable material at least one part, and the back surface of an absorber may be coat | covered, liquid Both ends in the longitudinal direction of the absorbent main body having a back sheet made of an impermeable material are arranged and fixed between the leg intermediate elastic members adjacent to the first intermediate sheet and the second intermediate sheet, respectively. This is the step of obtaining the absorbent main body fixing body.

  In the step (I), the absorbent main body may be completely fixed to both the first intermediate sheet and the second intermediate sheet, that is, fixed in a non-detachable manner, or completely fixed to one side. You may fix to the other so that attachment or detachment is possible. Moreover, you may fix to both so that attachment or detachment is possible.

  FIG. 22 shows that both ends 42 a and 42 a in the longitudinal direction of the absorbent main body 42 are stretchable around the adjacent legs of the first intermediate sheet 25 and adjacent legs of the second intermediate sheet 26. It is an example which shows the absorptive main body fixing body 50 obtained by arrange | positioning and fixing between each of the materials 13b and 13b.

  In addition, when an absorptive main body is fixed to a 1st intermediate body sheet and a 2nd intermediate body sheet | seat, it is preferable to fix to these non-shrinkage | contraction area | regions. When the absorbent main body is fixed to the non-shrinkable region, there is an advantage that it is stably fixed to the waist belt. Moreover, since it is hard to produce a clearance gap between an absorptive main body and a waist belt, there exists an advantage that it can prevent that excrement leaks from the said clearance gap.

[2-2-1] Absorber:
The absorber is a member for absorbing and holding the wearer's urine. The absorber is made of an absorbent material because it needs to absorb and retain the wearer's urine and body fluid.

  Examples of the absorbent material constituting the absorbent body include conventionally known absorbent materials that are usually used in conventional disposable diapers, such as fluff pulp, superabsorbent polymer (hereinafter referred to as “SAP”), A hydrophilic sheet etc. can be mentioned. It is possible to use wood pulp or non-wood pulp defibrated as fluff pulp, sodium polyacrylate as SAP, tissue, absorbent paper, hydrophilized nonwoven fabric as hydrophilic sheet preferable.

  These absorbent materials are usually used as a single-layer or multi-layer mat. Under the present circumstances, 1 type may be used independently among the said absorptive materials, and 2 or more types may be used together. Especially, what used together about 10-500 mass parts SAP with respect to 100 mass parts of fluff pulp is preferable. At this time, the SAP may be uniformly mixed in each mat of fluff pulp, or may be arranged in layers between the layers of the multilayer fluff pulp.

  It is preferable that the absorber is interposed at least in part between the top sheet and the back sheet. Usually, the absorber is interposed between the top sheet and the back sheet by being sandwiched between the top sheet and the back sheet and sealing the peripheral edge thereof. Therefore, the flap part in which the absorber is not interposed is formed between the top sheet and the back sheet at the peripheral part of the absorber. The absorber is interposed in at least a part between the top sheet and the back sheet. More specifically, the absorbent body is interposed at least in the central portion (inseam portion) in the longitudinal direction of the absorbent main body. In addition, the absorber may be arrange | positioned over the both ends of the longitudinal direction of an absorptive main body.

  It is preferable that the absorber is entirely wrapped with a hydrophilic sheet. Such a configuration has an advantage that SAP can be prevented from leaking from the absorber and shape stability can be imparted to the absorber.

  Although there is no restriction | limiting in particular about the shape of an absorber, For example, the shape used in the conventional disposable diaper, for example, a rectangular shape, an hourglass type, a gourd type, a T shape etc. can be mentioned.

  In addition, a sheet (second sheet) for diffusing liquid such as urine and body fluid may be incidentally disposed on the surface side of the absorber (for example, between the absorber and the top sheet). . When this second sheet is attached, due to the wearer's posture, etc., even when the space on the back side of the top sheet is not sufficiently formed, the absorption rate of urine, body fluid, etc. is difficult to decrease, and the absorption rate decreases. It is possible to prevent leakage of urine and body fluids.

  Examples of the material constituting the second sheet include hydrophilic and liquid-permeable materials such as woven fabric, non-woven fabric, porous plastic, and fluff pulp. Examples of these constituent materials include polypropylene, polyethylene, polyester, rayon, pulp, and composite fibers thereof. As the pulp, crimped fibers such as curly cellulose fibers can be suitably used.

[2-2-2] Top sheet:
A top sheet is a sheet | seat arrange | positioned so that the surface (surface of the wearer side at the time of wear) of an absorber may be coat | covered. Since it is necessary for the absorbent body to absorb the wearer's urine, at least a part (all or a part) of the top sheet is made of a liquid-permeable material. Usually, at least near the surface of the absorber, it is made of a liquid-permeable material that can permeate the wearer's urine and body fluid. As long as at least a part is made of the liquid permeable material, the entire top sheet is not necessarily made of the liquid permeable material.

  Examples of the liquid permeable material constituting the top sheet include a woven fabric, a nonwoven fabric, and a porous film. Among these, it is preferable to use a non-woven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, nylon (registered trademark) or the like and subjected to a hydrophilic treatment. There is no restriction | limiting in particular also about the kind of nonwoven fabric, The conventionally well-known nonwoven fabric manufactured by various manufacturing methods, such as air through (card hot air), card | curd embossing, and a spun bond, can be used suitably.

[2-2-3] Backsheet:
A backsheet is a sheet | seat arrange | positioned so that the back surface (surface of the wearer's clothing side at the time of wear) may be coat | covered. The back sheet is made of a liquid-impermeable material in order to prevent the wearer's urine from leaking outside the diaper.

  The arrangement method is not particularly limited, and a configuration in which the back sheet is arranged so as to coincide with the top sheet can be employed. However, it is not always necessary to adopt such a configuration. From the viewpoint of preventing leakage of urine absorbed by the absorber, a back sheet made of a liquid-impermeable material is disposed at least in a portion where the absorber is present. May be.

  Examples of the liquid-impermeable material constituting the back sheet include a liquid-impermeable film made of a resin such as polyethylene. Among these, it is preferable to use a microporous polyethylene film. This microporous polyethylene film has a large number of fine pores of 0.1 to several μm, and is liquid impervious but has moisture permeability, so it can prevent stuffiness inside the disposable diaper. There are advantages.

[2-2-4] Solid gathering:
The absorbent main body can be provided with a three-dimensional gather to prevent side leakage of urine excreted by the wearer. The three-dimensional gather is a member for preventing side leakage of the urine excreted by the wearer, and is a leak-proof wall configured to stand up three-dimensionally. By forming such a three-dimensional gather, the three-dimensional gather becomes a breakwater, and leakage from a leg opening or the like of a disposable diaper (so-called “lateral leakage”) can be effectively prevented.

  The structure used for the conventional disposable diaper can be employ | adopted for the structure of a solid gather. For example, a material in which a stretchable material for a three-dimensional gather is arranged on a part of the water-repellent sheet material, and a gather (gutter) is formed on the sheet material by the three-dimensional gathered elastic material can be suitably used.

  The three-dimensional gather may be formed of a sheet material that is completely different from the top sheet or the back sheet, but may be formed by folding the top sheet or the like.

  In order to prevent leakage from the crotch part, this three-dimensional gather may be formed at least in the center part (inseam part) in the longitudinal direction of the absorbent main body, but extends over both ends in the longitudinal direction of the absorbent main body. It may be formed. Note that at least one pair of solid gathers must be formed, but two or more pairs may be formed.

  The three-dimensional gather may be an inversion gather that tilts toward the inside of the disposable diaper, or may be an outside gather that tilts toward the outside of the disposable diaper. Further, a three-dimensional gather (a so-called C-fold gather, Z-fold gather, or the like) in which a bent portion or a folded portion is formed in a part of the height direction can also be used.

[2-2-5] Leg gather:
An absorptive main body can also be equipped with a leg gather in the both-sides edge of the solid gathers. Leg gathers are for preventing leakage of excrement as in the case of three-dimensional gathers. The leg gather is fixed along the absorbent main body around the wearer's leg, thereby preventing the lateral displacement of the absorbent main body and effectively preventing the excrement from leaking. The leg gathers are preferably arranged outside the absorber at both side edges of the three-dimensional gather.

  Leg gathers are formed on a sheet material (absorbent body) by using a stretchable elastic material (a stretchable material for leggather) in a stretched state between a side sheet and a backsheet, and using the force that the stretchable elastic material shrinks. Gather. This gather is in an extended state when worn compared to the most contracted state. Therefore, the shrinking force of the elastic elastic material is applied around the wearer's leg, and the wearer's leg can be tightened to fix the absorbent main body. Further, the leg gathers stably fix the absorbent main body in order to absorb the dimensional change around the legs of the absorbent main body caused by the movement (movement) of the legs by partially expanding and contracting the leg gathers. It works as effectively.

  FIG. 23 shows an example of an absorbent main body 42 in which leg gathering elastic members 55 are arranged in an extended state on both sides of the three-dimensional gather 52 and outside the absorber 54. FIG. 24 shows a cross section taken along line A-A ′ of FIG. 23, and leg gathers 56 are formed on the absorbent main body 42 by leg gathering elastic materials 55.

  An absorptive main body can be manufactured as follows. First, an absorbent body wrapped in a hydrophilic sheet is disposed at the center in the width direction on the surface side of a long sheet material (back sheet material) that is a material for the back sheet. Next, a long sheet material (top sheet material) which is wider than the absorbent body and narrower than the back sheet material and is used as a top sheet material is laminated on the absorbent body. A laminate is obtained.

  Next, a three-dimensional gather is manufactured. First, the expansion / contraction material for solid gathers is arranged inside one end of the sheet material for solid gathers. Next, the end portions of the sheet material are folded back and pasted together so as to sandwich the three-dimensional gather elastic material. Next, the other end side of the sheet material is bonded to both end portions of the long laminate to obtain a three-dimensional gather. In addition, when pasting together, the leg gathers elastic material is stretched and is located on both sides of the top sheet material. Secure with. A hot melt adhesive can be suitably used for fixing the stretchable material for three-dimensional gathers and the stretchable material for leg gathers and for bonding the three-dimensional gathers to the long laminate.

  Next, a hook material for fixing the absorbent main body to the waistband is attached to the surface on the back sheet side, which is a portion corresponding to both ends of the absorbent main body in the longitudinal direction of the long laminate. . Next, the long laminate provided with the hook material is cut at a predetermined position perpendicularly to the length direction to obtain an absorbent main body. In addition, about the absorptive main body, what was obtained by methods other than the said manufacturing method may be used.

  FIG. 24 is obtained by arranging the absorber 54 on the back sheet 61 and then laminating the top sheet 62 wider than the absorber 54 and narrower than the back sheet 61 on the absorber 54. The absorbent main body 42 is provided with a three-dimensional gather 52 in which a three-dimensional gather expansion / contraction material 63 is disposed at both ends of the absorber 54.

[2-3] (J) Process:
(J) The step is to fold the absorbent main body fixing body so that the absorbent main body is located on the inner side, so that the first intermediate sheet and the second intermediate sheet have one end edge and the other end edge. This is a step of obtaining a laminated body for diapers by being laminated so that the tops of the leg-stretchable materials overlap each other while being positioned on the same side.

[2-4] Step (K):
(K) A diaper joined body is formed by forming a fixing portion that passes through the top and fixes the first intermediate sheet and the second intermediate sheet to each other along the short direction of the diaper laminate. It is the process of obtaining. The fixing portion can be formed in the same manner as the fixing portion already described above.

[2-5] Step (L):
(L) A process cuts along a transversal direction of a diaper zygote while passing a diaper zygote, and a waist belt and the above-mentioned absorptive main body fixed to this waist belt. It is the process of obtaining the disposable diaper which has.

  In addition, although it is preferable to perform the manufacturing method of the disposable diaper of this invention in order of (G) process-(L) process, there is no restriction | limiting in particular in the order of each process. For example, performing the process ((A) process-(E) process) which manufactures a waist belt with the manufacturing method of the waist belt of this invention mentioned above, and fixing both ends of the said absorptive main body to this waist belt after that. You may perform the process of manufacturing a disposable diaper by.

  The method for producing a waist belt according to the present invention is suitable as a method for producing a waist belt for diapers for infants or adults such as elderly people and persons with disabilities who need care. Moreover, the manufacturing method of the disposable diaper of this invention is suitable as a manufacturing method of diapers for infants or adults, such as an elderly person and a disabled person who require nursing care.

It is a top view which shows 1 process of 1st embodiment of the manufacturing method of the waist belt of this invention. It is a top view which shows 1 process of 1st embodiment of the manufacturing method of the waist belt of this invention. It is a top view which shows 1 process of 1st embodiment of the manufacturing method of the waist belt of this invention. It is a top view which shows 1 process of 1st embodiment of the manufacturing method of the waist belt of this invention. It is a front view which shows the waist belt manufactured by 1st embodiment of the manufacturing method of the waist belt of this invention. It is a front view which shows the disposable diaper manufactured by one Embodiment of the manufacturing method of the disposable diaper of this invention. It is a top view which shows 1 process of 2nd embodiment of the manufacturing method of the waist belt of this invention. It is a top view which shows 1 process of 3rd embodiment of the manufacturing method of the waist belt of this invention. It is a top view which shows 1 process of 3rd embodiment of the manufacturing method of the waist belt of this invention. It is a top view which shows 1 process of 3rd embodiment of the manufacturing method of the waist belt of this invention. It is a top view which shows 1 process of 3rd embodiment of the manufacturing method of the waist belt of this invention. It is a front view which shows the waist belt manufactured by 3rd embodiment of the manufacturing method of the waist belt of this invention. It is a top view which shows 1 process of 4th embodiment of the manufacturing method of the waist belt of this invention. It is a top view which shows 1 process of 5th embodiment of the manufacturing method of the waist belt of this invention. It is a top view which shows 1 process of 5th embodiment of the manufacturing method of the waist belt of this invention. It is a top view which shows 1 process of 5th embodiment of the manufacturing method of the waist belt of this invention. It is a front view which shows the waist belt manufactured by 5th embodiment of the manufacturing method of the waist belt of this invention. It is a top view which shows 1 process of 6th embodiment of the manufacturing method of the waist belt of this invention. It is a top view which shows 1 process of 6th embodiment of the manufacturing method of the waist belt of this invention. It is a top view which shows 1 process of 6th embodiment of the manufacturing method of the waist belt of this invention. It is a top view which shows 1 process of 6th embodiment of the manufacturing method of the waist belt of this invention. It is a top view which shows 1 process of one Embodiment of the manufacturing method of the disposable diaper of this invention. It is a top view which shows one Embodiment of the absorptive main body used for the manufacturing method of the disposable diaper of this invention. It is sectional drawing which shows the A-A 'cross section of FIG.

Explanation of symbols

10a, 10b, 10c, 10d: waist belt, 11: long sheet, 12: elastic material around the waist, 13a, 13b: elastic material around the leg, 15: elastic sheet, 17: region where the elastic material around the leg is attached , 18: top, 21: one edge, 22: other edge, 25: first intermediate sheet, 26: second intermediate sheet, 31: fixing part, 33: joined body, 35: ventral side Sheet: 37: Perforation, 39: Through hole, 41: Laminated body, 42: Absorbent body, 42a: End of absorbent body, 44: Opening around waist, 45: Opening around leg, 50: Absorbent Fixed body, 52: Solid gather, 54: Absorbent body, 55: Stretch material for leg gather, 56: Leg gather, 61: Back sheet, 62: Top sheet, 63: Stretch material for solid gather, 100: Disposable diaper, X1, X2, 1, Y2, Y3: wavy trajectory.

Claims (10)

A method of manufacturing a waist belt for fixing an absorbent main body to a wearer's body,
Along the belt-like long sheet, the elastic material around the waist is attached in an extended state along the longitudinal direction, and the elastic material around the leg is attached in an extended state so as to draw a wavy locus along the longitudinal direction of the long sheet. And obtaining a stretchable sheet (A),
A region of the elastic sheet where the elastic material around the legs is attached is cut along the longitudinal direction of the elastic sheet, including one end edge in the short direction of the elastic sheet, (B) a step of obtaining a first intermediate sheet having the top of the elastic material and a second intermediate sheet including the other edge and having the top of the elastic material around the legs;
The first intermediate sheet and the second intermediate sheet are arranged such that the one end edge and the other end edge are located on the same side, and the tops of the elastic members around the legs overlap each other. (C) step of obtaining a laminate by laminating
A bonded portion is formed in the laminate by forming a fixing portion that fixes the first intermediate sheet and the second intermediate sheet to each other along the short direction of the laminate through the top. Obtaining (D),
Cutting the joined body along the short direction of the joined body through the apex to obtain a waist belt (E), and manufacturing a waist belt.   The trajectory for cutting the stretchable sheet has the same wavelength and phase as the wavelength and phase of the wavy trajectory drawn by the leg elastics, and the amplitude is the amplitude of the wavy trajectory drawn by the leg elastics. The method for manufacturing a waist belt according to claim 1, wherein the method has a wave shape smaller than that of the waist belt.   3. The method of manufacturing a waist belt according to claim 1, wherein the wavy trajectory drawn by the leg-surrounding elastic material and the wavy trajectory for cutting the elastic sheet are each in an S-curve shape.   The method for manufacturing a waist belt according to claim 1, wherein a trajectory for cutting the stretchable sheet is linear. The leg-around elastic material has an attached part attached to the long sheet and a non-attached part other than the attached part,
The said non-attachment part is a manufacturing method of the waist belt as described in any one of Claims 1-4 located on the locus | trajectory which cut | disconnects the said elastic sheet.   The process according to claim 1, further comprising: (F) a step of cutting a portion intersecting a trajectory for cutting the elastic sheet, of the elastic material around the legs of the elastic sheet after obtaining the elastic sheet. The manufacturing method of the waist belt as described in any one of Claims.   The fixing part has a detachable first fixing part and a non-detachable second fixing part, and the joined body has the first fixing part and the second fixing part in its longitudinal direction. The manufacturing method of the waist belt as described in any one of Claims 1-6 by which the fixing | fixed part is arrange | positioned alternately. Along the belt-like long sheet, the elastic material around the waist is attached in an extended state along the longitudinal direction, and the elastic material around the leg is attached in an extended state so as to draw a wavy locus along the longitudinal direction of the long sheet. And obtaining a stretchable sheet (G),
A region of the elastic sheet where the elastic material around the legs is attached is cut along the longitudinal direction of the elastic sheet, including one end edge in the short direction of the elastic sheet, (H) a step of obtaining a first intermediate sheet having the top of the elastic material and a second intermediate sheet including the other end edge and having the top of the elastic material around the legs;
An absorber, a top sheet that is arranged so as to cover the surface of the absorber, and at least partly made of a liquid permeable material, and a back sheet that is arranged so as to cover the back surface of the absorber. The both ends in the longitudinal direction of the absorbent main body having a back sheet are disposed between the first intermediate sheet and the elastic material around the legs adjacent to the second intermediate sheet, and fixed. (I) step of obtaining an absorbent main body fixing body,
The absorbent main body fixing body is bent so that the absorbent main body is located on the inner side, and the first intermediate sheet and the second intermediate sheet are separated from each other by the one edge and the other edge. (J) step of obtaining a laminated body for diapers by being laminated so that the tops of the elastic members around the legs overlap with each other and positioned on the same side;
A fixing portion for fixing the first intermediate sheet and the second intermediate sheet to each other is formed in the diaper laminate along the short direction of the diaper laminate through the top. (K) step of obtaining a bonded body for diapers;
A disposable diaper having a waist belt and the absorbent main body fixed to the waist belt by cutting the diaper joined body along the short direction of the diaper joined body through the top. (L) The process of manufacturing a disposable diaper provided with the process.   The trajectory for cutting the stretchable sheet has the same wavelength and phase as the wavelength and phase of the wavy trajectory drawn by the leg elastics, and the amplitude is the amplitude of the wavy trajectory drawn by the leg elastics. The manufacturing method of the disposable diaper of Claim 8 which is a wave shape small compared with.   The disposable diaper manufacturing method according to claim 8 or 9, wherein the wavy trajectory drawn by the leg-surrounding elastic material and the wavy trajectory for cutting the elastic sheet are each in an S-curve shape.

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