JP2011103945A - Method of manufacturing disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of efficiently manufacturing a disposable diaper including first and second three-dimensional gathers, in which the first and second three-dimensional gathers are fixed in different shapes at the longitudinal front and back end parts of an absorbent body. <P>SOLUTION: The manufacturing method is the method for manufacturing a diaper 1 including the first and second three-dimensional gathers 5 and 6, in which the fixing states of the first and second three-dimensional gathers 5 and 6 are different at the abdominal side part A and back side part B of the absorbent body 3. The manufacturing method includes: a fold-down step of folding down free end parts 105a and 106a of a strip-like member 105 for forming the first three-dimensional gathers and a strip-like member 106 for forming the second three-dimensional gathers; a first bonding step of bonding the folded-down free end parts 105a and 106a to the upper surface of the absorbent body continuum 103; and a re-folding step of raising the folded-down free end part 106a of the strip-like member 106 for forming the second three-dimensional gathers, and folding it again toward the outer side in the width direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

  As a conventional disposable diaper, a disposable diaper provided with two three-dimensional gathers standing upward on both side portions of an absorbent main body is known. For example, in Patent Document 1, as a disposable diaper as described above, a first three-dimensional guard (gather) standing on the inner side and a first three-dimensional guard (gather) standing on the both sides of the absorbent main body. Disposable diapers having a second three-dimensional guard (gather) are known. In such a disposable diaper described in Patent Document 1, the first solid guard (gather) and the second solid guard (gather) are provided on both side portions of the absorbent main body, and therefore, leakage prevention is high.

  However, the first three-dimensional guard (gather) and the second three-dimensional guard (gather) described in Patent Document 1 are fixed in the same shape at the front and rear end portions in the longitudinal direction of the absorbent main body. It may be difficult to fit the first three-dimensional guard (gather) and the second three-dimensional guard (gather) to a completely different body.

  For example, Patent Document 2 discloses a disposable diaper in which three-dimensional gathers arranged on both sides of an absorbent main body are folded inward in the front body and folded outward in the rear body, and the production thereof. A method is described.

  However, the disposable diaper described in Patent Document 2 is a disposable diaper provided with one three-dimensional gather standing up on both sides of the absorbent main body. Patent Document 2 absorbs two three-dimensional gathers. The manufacturing method of the disposable diaper fixed in the different shape in the longitudinal direction front-and-rear part of the sex main body is not disclosed at all.

JP-A-11-235357 JP 2009-56141 A

  Therefore, the subject of this invention is a disposable diaper provided with the 1st solid gather and the 2nd solid gather, Comprising: The 1st solid gather and the 2nd solid gather differ in the longitudinal direction front-and-back end part of an absorptive main part. It is providing the manufacturing method of the disposable diaper which can manufacture the disposable diaper currently fixed by the shape efficiently.

  The present invention includes a rectangular absorbent main body including an absorbent body, a first three-dimensional gather, and a second three-dimensional gather outside the first three-dimensional gather in the width direction along each of both longitudinal sides thereof. Of the first three-dimensional gather and the second three-dimensional gather so that the width of the dorsal side portion is wider than the width of the ventral side portion at the ventral side portion and the dorsal side portion of the absorbent main body. A disposable diaper manufacturing method for continuously manufacturing disposable diapers having different fixed states by continuously transporting an absorbent body continuous body in which the absorbent body is continuous in the longitudinal direction, the first three-dimensional gathering The free end portion of the first three-dimensional gather forming belt-shaped member that forms the shape is tilted toward the center in the width direction, and the substantially center position in the width direction of the upright planned portion of the first three-dimensional gather forming belt-shaped member With the free end outward in the width direction The upper surface of the absorbent main body continuity is folded between the absorbers that are folded and folded to form the expected standing part and between the absorbent bodies that are continuous in the conveying direction. The first end of the first joining step and the free end portion of the second three-dimensional gather forming band-like member for forming the second three-dimensional gather on the upper surface of the absorbent main body continuum. A folding step of folding toward the center of the direction, and the second raised portions of the folded band-like member for forming the second three-dimensional gather, every other one of the first joints that are continuous in the transport direction, A second joining step of joining the upper surface of the absorbent main body continuation so as to cover the folded uprising part at substantially the same position as the first joining part, and forming a second joining part; The absorber between the second joint portions adjacent to each other Next, a refolding step for raising the folded free end of the second three-dimensional gathering belt-shaped portion and folding it toward the outside in the width direction of the absorbent main body is adjacent to the conveying direction. The manufacturing method of the disposable diaper which comprises the cutting process which cut | disconnects the said absorptive main body continuous body between every said absorptive main bodies and obtains each said absorptive main body is provided.

  According to the method of manufacturing a disposable diaper of the present invention, the first three-dimensional gather and the second three-dimensional gather can efficiently produce a disposable diaper that is fixed in different shapes at the longitudinal front and rear ends of the absorbent main body. Can do.

FIG. 1 is a perspective view of a pants-type disposable diaper obtained by an embodiment of the present invention. FIG. 2 is a plan view of the pants-type disposable diaper shown in FIG. 1 as viewed from the top sheet side in an expanded state. 3A is a cross-sectional view taken along line X1-X1 in FIG. 2, FIG. 3B is a cross-sectional view taken along line X2-X2 in FIG. 2, and FIG. 3C is a cross-sectional view taken along line X3-X3 in FIG. FIG. FIG. 4 is a schematic process diagram of the first half part showing how the absorbent main body of the pants-type disposable diaper shown in FIG. 1 is manufactured according to the embodiment of the present invention. FIG. 5 is a side view showing details of the folding step D in the embodiment of the present invention. FIG. 6 is a plan view showing an arrangement relationship between the folding plate 18 and the folding plate 19 in the folding step D in the embodiment of the present invention. FIG. 7 is a schematic process diagram of the latter half portion showing how the absorbent main body of the pants-type disposable diaper shown in FIG. 1 is manufactured according to the embodiment of the present invention. FIG. 8 is a side view showing details of the folding process H in the embodiment of the present invention. FIG. 9 is a plan view showing the arrangement relationship of the folding plate 16b in the folding process H in the embodiment of the present invention. FIG. 10 is a schematic process diagram showing how the pants-type disposable diaper shown in FIG. 1 is manufactured according to the embodiment of the present invention. FIG. 11 is a schematic process diagram showing how a pants-type disposable diaper is manufactured according to another embodiment of the present invention. FIG. 12 is a plan view showing an absorbent main body continuum 103 ′ used in manufacturing a tape-type disposable diaper according to another embodiment of the present invention.

Hereinafter, the manufacturing method of the disposable diaper of this invention is demonstrated, referring drawings based on the preferable embodiment.
As shown in FIGS. 1 and 2, the disposable diaper manufactured in the present embodiment includes a rectangular absorbent main body 3 including an absorbent body 33 and a first three-dimensional gather 5 along each of both longitudinal sides thereof. And the second three-dimensional gather 6 on the outer side in the width direction than the first three-dimensional gather 5, and the width of the back side part B is the ventral side part in the ventral side part A and the back side part B of the absorbent main body 3 It is the underpants type disposable diaper 1 from which the fixed state of the 1st solid gathers 5 and the 2nd solid gathers 6 differs so that it may become wider than A width | variety.

  In the present embodiment, as shown in FIG. 4, the free end portion 105 a of the first three-dimensional gather forming belt-like member 105 forming the first three-dimensional gather 5 is tilted toward the center in the width direction and the first Folding step of folding the free end portion 105a outward in the width direction at the substantially center position in the width direction of the upright portion 105c of the one-dimensional gather forming band member 105 to form the upright portion 105c in a folded state. D, as shown in FIG. 4, the folded uprising portion 105 c is joined to the upper surface of the absorbent main body continuous body 103 between the absorbent bodies 33 that are continuous in the transport direction, and the first joint portion 7 a is First joining step E to be formed, as shown in FIG. 7, the free end portion 106 a of the second three-dimensional gather forming belt-like member 106 that forms the second three-dimensional gather 6 is formed on the upper surface of the absorbent main body continuous body 103 with a width. Direction Folding step F for folding toward the center, as shown in FIG. 7, the first rising portion 106 c of the folded second solid gathering forming belt-like member 106 is connected to the first joining portion 7 a continuous in the transport direction. Are joined to the upper surface of the absorbent main body continuous body 103 so as to cover the folded uprising portion 105c at substantially the same position as the first joint portion 7a, thereby forming the second joint portion 7b. 2 joining process G, as shown in FIG. 7, the freedom of the strip | belt part 106 for the 2nd three-dimensional gathers formation folded between every absorber 33 between the 2nd junction parts 7b adjacent to a conveyance direction. The end part 106a is raised and the absorbent body continuous body 103 is cut individually between the absorbent bodies 3 adjacent to each other in the conveying direction H, the refolding step H in which the absorbent body 3 is folded outward in the width direction. Disposable through the cutting process to obtain the absorbent main body 3 The production of Mutsu 1.

Hereinafter, the manufacturing method of this embodiment will be described in more detail.
First, the underpants type disposable diaper 1 manufactured by this embodiment is demonstrated.
As shown in FIGS. 1 and 2, the pants-type disposable diaper 1 includes an abdominal sheet member 2 </ b> A disposed on the wearer's belly side, a back sheet member 2 </ b> B disposed on the wearer's back side, It has a vertically long absorbent main body 3 that is fixed over the side sheet member 2A and the back sheet member 2B.

  As shown in FIG. 1 and FIG. 2, the diaper 1 is, when worn, an abdominal side A disposed on the abdomen side of the wearer, a dorsal side B disposed on the back side of the wearer, and an abdomen side part. It has a crotch part C which is located between A and the back side part B and is arranged in a wearer's crotch part. The longitudinal direction of the diaper 1 (Y direction in the figure) is the direction from the abdominal side A through the crotch C to the back side B or the opposite direction, and the width direction of the diaper 1 (X direction in the figure). Is a direction perpendicular to the longitudinal direction of the diaper.

  As shown in FIG. 2, the abdominal sheet member 2 </ b> A and the back sheet member 2 </ b> B each have a rectangular shape that is long in the width direction (X direction) when the diaper 1 is stretched, and a pair of left and right along the Y direction. It has side edges 2a, 2a. Similarly, the back seat member 2B has a long rectangular shape in the X direction and has a pair of left and right side edges 2b, 2b. And, as shown in FIG. 1, the side seal portion 4a is provided on the diaper 1 by joining the side edge portion 2a of the ventral sheet member 2A and the side edge portion 2b of the back seat member 2B. 4. A waist opening WO and a pair of leg openings LO, LO are formed. For this joining, for example, heat seal, high frequency seal, ultrasonic seal, adhesive, or the like is used.

  As shown in FIG. 2, each of the abdominal sheet member 2 </ b> A and the back sheet member 2 </ b> B includes an outer layer sheet 21 that forms the outer surface of the diaper, an inner layer sheet 22 disposed on the inner surface side of the outer layer sheet 21, and both sheets 21. , 22 are provided with a plurality of thread-like elastic members 23 that are spaced apart in the Y direction. In each of the abdominal sheet member 2A and the back sheet member 2B, a plurality of thread-like elastic members 23 are arranged between the sheets 21, 22 in the X direction, and between the sheets 21, 23. Is fixed with an adhesive to form a stretchable part.

  As shown in FIGS. 2 and 3, the absorbent main body 3 includes a liquid-permeable top sheet 31, a liquid-impermeable or water-repellent back sheet 32, and a liquid holding member disposed between the sheets 31 and 32. As shown in FIG. 2, it has a rectangular shape that is long in the Y direction. The absorbent body 33 is composed of an absorbent core (not shown) in which water-absorbing polymer particles are held in an aggregate of fibers such as pulp fibers, and a core wrap sheet (not shown) that covers the absorbent core. The top sheet 31, the back sheet 32, and the absorber 33 are all rectangular shapes that are long in the Y direction, and the top sheet 31 and the back sheet 32 are from both ends in the Y direction and both ends in the X direction of the absorber 33. Joined at the outwardly extending portion, a rectangular absorbent main body 3 that is long in the Y direction is formed.

  As shown in FIGS. 2 and 3, the absorbent main body 3 includes a first three-dimensional gather 5 and an outer side in the width direction from the first three-dimensional gather 5 along both side portions in the longitudinal direction (Y direction). And a second three-dimensional gather 6 formed in the above. As described above, the first three-dimensional gather 5 and the second three-dimensional gather 6 are arranged along the longitudinal direction (Y direction) on both sides in the longitudinal direction (Y direction) of the absorbent main body 3, and FIG. As shown to a), the 1st solid gathers 5 stand up toward the wearer's skin side in the crotch part C at the time of wear, and the 2nd solid gathers 6 It stands outside the width direction of the absorbent main body 3 relative to the three-dimensional gather 5 and toward the wearer's skin side.

  As shown in FIG. 3A, each first three-dimensional gather 5 includes a liquid-resistant or water-repellent sheet material 51 and an elastic member 52 for forming a first three-dimensional gather fixed to the sheet material 51. Have. As shown in FIG. 3A, each second three-dimensional gather 6 includes a sheet material 61 and an elastic member 62 for forming a second three-dimensional gather fixed to the sheet material 61. The sheet material 51 and the sheet material 61 in the diaper 1 </ b> A are formed from one sheet as shown in FIG. 3A, and one end portion of one sheet in the X direction is the surface of the absorbent main body 3. It is arranged between the sheet 31 and the back sheet 32 and is fixed at the joint 34. The other end portion (free end portion) in the X direction of one sheet extends outward in the X direction and is folded in two at a portion that becomes the free end portion 6a on the free end portion side of the second three-dimensional gather 6, As a result, the elastic member 62 is fixed between the opposing sheets via an adhesive to form the second three-dimensional gather 6, and the other end (free end) is as shown in FIG. In addition, the elastic member 52 is folded in two at a portion that extends inward in the X direction and becomes the free end portion 5a on the free end portion side of the first three-dimensional gather 5, thereby interposing the elastic member 52 between the opposing sheets. Are fixed to form a first three-dimensional gather 5.

  The elastic member 52 that forms the first three-dimensional gather 5 and the elastic member 62 that forms the second three-dimensional gather 6 are arranged in a stretched state parallel to the longitudinal direction (Y direction) of the absorbent main body 3. The joint portion 34 extends along both side edges of the absorbent main body 5. As shown in FIG. 3 (a), each first three-dimensional gather 5 has a free end portion 5a standing toward the wearer's skin side with the joint portion 34 as a fixed end in the crotch portion C when worn. In each crotch part C when worn, each second three-dimensional gather 6 has the joint portion 34 as a fixed end, and the free end portion 6a stands up toward the wearer's skin.

  As shown in FIG. 2, the absorbent main body 3 has one end side in the longitudinal direction (Y direction) (a portion overlapping the ventral sheet member 2 </ b> A) at the center in the width direction (X direction) of the ventral sheet member 2 </ b> A. The other end side in the longitudinal direction (the portion overlapping with the back sheet member 2B) is fixed to the central portion in the width direction (X direction) of the back sheet member 2B via the adhesive. Is fixed.

  As shown in FIGS. 3B and 3C, each first three-dimensional gather 5 in the diaper 1 is folded into the first joint portion 7a in the abdominal side portion A and the back side portion B. Is fixed. Specifically, as shown in FIG. 3 (b), each first three-dimensional gather 5 has a length in the X direction of the first three-dimensional gather 5 in the portion located on the ventral sheet member 2A (first The length between the free end 5a and the fixed end of the three-dimensional gather 5 and hereinafter also referred to as “standing portion”) is approximately half the position of the absorbent main body 3 in the width direction (X direction). The free end portion 5a of the first three-dimensional gather 5 is folded to the outer side in the width direction (X direction) of the absorbent main body 3 at the approximately half position and tilted to the inner side. In a state of being folded so as to face outward in the direction (X direction), it is fixed on the top sheet 31 that covers the skin contact surface side of the absorbent body 33 by the first joint portion 7a. Moreover, as shown in FIG.3 (c), each 1st three-dimensional gather 5 is a standing part of the 1st three-dimensional gather 5 also in the part located on the back | dorsal sheet | seat member 2B similarly to the abdominal sheet | seat member 2A. Of the absorbent body 3 is folded inward in the width direction (X direction) of the absorbent main body 3, and is folded outward in the width direction (X direction) of the absorbent main body 3 in about half of the position. The top sheet 31 that covers the skin contact surface side of the absorbent body 33 in a state where the free end portion 5a of the first three-dimensional gather 5 is folded so as to face outward in the width direction (X direction) of the absorbent main body 3. It is being fixed on the 1st junction part 7a on the top.

  As shown in FIG. 3 (b), each of the second three-dimensional gathers 6 in the diaper 1 is arranged in the width direction of the absorbent main body 3 so as to cover the first three-dimensional gathers 5 in the folded state. (X direction) In the state where it has fallen inward, it is fixed at the second joint 7b on the surface sheet 31 that covers the skin contact surface side of the absorbent body 33 at substantially the same position as the first joint 7a. ing. Moreover, as shown in FIG.3 (c), each 2nd three-dimensional gather 5 is in the state which fell down in the width direction (X direction) outward side of the absorptive main body 3 in the back side part B. It is fixed on the inner layer sheet 22 of the member 2B. When fixing each second three-dimensional gather 6 on the inner layer sheet 22 of the back sheet member 2B, it was used for fixing the absorbent main body 3 and the abdominal sheet member 2A or the back sheet member 2B described above. An adhesive is used. In addition, in the diaper 1, each 2nd solid gather 6 is being fixed on the inner layer sheet | seat 22 of the back | dorsal sheet | seat member 2B, as shown in FIG.3 (c), but it does not need to be fixed.

  In the diaper 1, as shown in FIG.3 (b), FIG.3 (c), a pair of 1st junction part 7a and a pair of 2nd junction part 7b are formed in the ventral | abdominal side part A, and it is X direction. It is formed symmetrically. The first joint portion 7a and the second joint portion 7b are formed by heat sealing, high frequency sealing, or ultrasonic sealing.

  As described above, the disposable diaper 1 includes the first three-dimensional gather 5 and the second three-dimensional body in the abdominal side portion A and the back side portion B of the absorbent main body 3 as shown in FIGS. 3 (b) and 3 (c). The fixed state of the gather 6 is different, and the width of the back side portion B is formed to be wider than the width of the ventral side portion A. Since the disposable diaper 1 is formed so that the width of the back side portion B is wider than the width of the abdominal side portion A, the second three-dimensional gather 6 is in the vicinity of the back side seat member 2B, and the wearer's buttocks Even if a large amount of bodily fluid is excreted, it is possible to cover the wearer's buttocks with the second three-dimensional gather 6 spread in the width direction (X direction) of the diaper 1. Leakage can be prevented. Furthermore, since the disposable diaper 1 is formed so that the width of the abdominal side portion A is narrowed, the first and second three-dimensional gathers 5 and 6 are located in the vicinity of the abdominal side sheet member 2A and the thigh of the wearer. A strong contact with the part is prevented, and the wearer's leg does not become difficult to move. Moreover, the external appearance seen from the ventral side A becomes a clean impression.

The material for forming the disposable diaper 1 will be described.
The outer layer sheet 21 and the inner layer sheet 22 constituting the abdominal sheet member 2A and the back sheet member 2B can be used without particular limitation as long as they are normally used for absorbent articles such as disposable diapers. For example, as the outer layer sheet 21 and the inner layer sheet 22, a water-repellent nonwoven fabric or the like can be used. As the surface sheet 31 and the back sheet 32 constituting the absorbent main body 3, any sheet can be used without particular limitation as long as it is normally used for absorbent articles such as disposable diapers. For example, a hydrophilic and liquid-permeable nonwoven fabric can be used as the top sheet 31, and a liquid-impermeable or water-repellent resin film or a laminate of a resin film and a nonwoven fabric is used as the back sheet 32. be able to. As the sheet materials 51 and 61 constituting the first three-dimensional gather 5 and the second three-dimensional gather 6, a stretchable film, a nonwoven fabric, a woven fabric, or a laminated sheet thereof can be used. The elastic member 23 constituting the ventral seat member 2A and the back seat member 2B, and the elastic members 52, 52 constituting the first three-dimensional gather 5 and the second three-dimensional gather 6, include natural rubber, polyurethane and polystyrene-polyisoprene. A thread-like stretchable material made of a polymer, a polystyrene-polybutadiene copolymer, a polyethylene-α-olefin copolymer such as ethyl acrylate-ethylene, or the like can be used.

  Next, as an embodiment of the present invention, a preferable manufacturing method of the pants-type disposable diaper 1 will be described with reference to FIGS. In the manufacturing method of the present embodiment, the absorbent main body 3 including the absorbent body 33 is continuously conveyed in the longitudinal direction (Y direction), and the diaper 1 is continuously conveyed. It is a manufacturing method. The longitudinal direction (Y direction) and the transport direction are the same direction, and the width direction (X direction) is a direction orthogonal to the transport direction (Y direction).

  In the manufacturing method of this embodiment, as shown in FIG. 4, the free end portion 105 a of the first three-dimensional gather forming belt-like member 105 that forms the first three-dimensional gather 5 is directed toward the center in the width direction (X direction). The free end portion 105a is folded back outward in the width direction (X direction) at a position approximately in the center in the width direction (X direction) of the upright planned portion 105c of the first three-dimensional gathering band member 105 that has been tilted. The folding step D for forming the upright scheduled portion 105c in a folded state is provided. Here, the stand-up scheduled portion 105c means a portion that will be a stand-up portion of the first three-dimensional gather 5 when worn in the future.

  As shown in FIG. 4, the folding process D includes a first roll 14, a second roll 15 positioned on the downstream side of the first roll 14, and between the first roll 14 and the second roll 15. The folding plate 18 that folds the upright planned portion 105c of the first three-dimensional gather forming belt-like member 105 inward in the X direction to a substantially half position, and the upright planned portion 105c at a substantially half position wide. A folding plate 19 that folds outward in the direction (X direction), and a pressing plate 20 that is positioned downstream and above the second roll 15b and holds the folded upstand portion 105c in that state. It is done using and. The absorbent main body continuum 103 is transported in the Y direction by the transport belt 11. The conveyor belt 11 is an endless belt, and the conveyor belt 11 is driven by a drive roller (not shown), and the base surface of the conveyor belt 11 is sucked by a vacuum means (not shown). Driving of the driving roller is controlled to a predetermined rotational speed by a control means (not shown) provided in the disposable diaper manufacturing apparatus.

  As shown in FIGS. 4 and 5, the first roll 14 and the second roll 15 each have a metallic cylindrical shape such as an aluminum alloy or steel. As shown in FIG. 4, the first roll 14 is formed so that the width in the X direction is shorter than the interval between the free end portions 105 a of the pair of first three-dimensional gathering band members 105. Thus, since the width | variety of the X direction of the 1st roll 14 is short and the 2nd roll 15 of the downstream is located above the 1st roll 14, as shown in FIG. The free end portion 105a of the first three-dimensional gathering band member 105 located on the center side of the side portion in the transport direction (Y direction) 103 is raised and floats upward as shown in FIG.

  Each of the folding plate 18 and the folding plate 19 is located between the first roll 14b and the second roll 15b, and conveys the absorbent main body continuum 103 in the Y direction, as shown in FIGS. A pair is provided on both sides of the belt 11 in the conveying direction (Y direction). As shown in FIG. 6, each of the pair of folding plates 18 and folding plates 19 is a metallic plate-like material such as an aluminum alloy or steel. As shown in FIG. 6, the pair of folding plates 18 are arranged so that the distance gradually increases from the upstream side to the downstream side in the transport direction (Y direction). The intervals are gradually reduced from the upstream side in the transport direction (Y direction) toward the downstream side. The length of each folding plate 19 (the length from the side edge of the conveyor belt 11) is longer than the length of each folding plate 18 (the length from the side edge of the conveyor belt 11). The distal end portion 19 a is disposed at an inner position in the width direction (X direction) of the absorbent main body continuum 103 than the distal end portion 18 a of each folded plate 18. The distance between the tip of each folded plate 19 and the tip of each folded plate 18 is preferably 10 mm to 100 mm. Between the front end portion 19a of each folded plate 19 and the front end portion 18a of each folded plate 18, the upright planned portion 105c of the first three-dimensional gathering band member 105 is passed. As shown in FIG. 6, the angle θ1 with respect to the conveyance direction (Y direction) of the folding plate 18 is preferably 95 ° to 150 °, and the inclination angle θ2 (tip 18a) of the tip 18a of the folding plate 18 is set. And the angle with the back sheet 32 of the absorbent main body continuum 103 is preferably 0 ° to 30 ° as shown in FIGS. As shown in FIG. 6, the angle θ3 with respect to the conveying direction (Y direction) of the folding plate 19 is preferably 10 ° to 85 °, and the inclination angle θ4 (absorption with the leading end portion 16a) of the leading end portion 19a of the folding plate 19. The angle of the sexual main body continuum 103 to the top sheet 31 is preferably 150 ° to 175 °, as shown in FIGS.

  As shown in FIGS. 4 and 5, the holding plate 20 is located on the downstream side of the second roll 15, and is provided on both sides of the transport belt 11 in the transport direction (Y direction) of transporting the absorbent main body continuum 103 in the Y direction. A pair is provided. As shown in FIGS. 4 and 5, the pair of holding plates 20 is a metallic plate-like material such as an aluminum alloy or steel, and the distance between the upstream side and the downstream side in the transport direction (Y direction). Is arranged so that it gradually becomes wider. Further, the upstream end portion 20 a of each pressing plate 20 extends to above the second roll 15. As shown in FIG. 4, the angle θ <b> 5 with respect to the conveying direction (Y direction) of the pressing plate 20 is preferably 95 ° to 150 °, and as shown in FIGS. 4 and 5, the tip end portion 20 a of the pressing plate 20. Is preferably 0 ° to 15 ° (the angle between the tip 20a and the topsheet 2 of the absorbent main body continuum 103).

  In the manufacturing method of the present embodiment, as shown in FIG. 4, the folded up-scheduled portion 105 c of the absorbent main body continuum 103 is provided between the absorbent bodies 33 that are continuous in the transport direction (Y direction). A first joining step E for joining the upper surface and forming the first joining portion 7a is provided.

  The first joining step E is performed using a seal roll 13 and a flat roll (not shown) that is a receiving roll. As shown in FIG. 4, the seal roll 13 and the flat roll are arranged to face each other in the vertical direction, and are made of a metallic cylindrical shape such as an aluminum alloy or steel. On the peripheral surface of the seal roll 13, a pair of seal block portions 131 and 131 corresponding to the first joint portion 7 a are provided at positions separated in the X direction. The seal block 131 is disposed on the peripheral surface of the seal roll 13 at a position corresponding to each absorbent main body 3 that forms the absorbent main body continuous body 103. The seal roll 13 and the flat roll are provided so as to rotate synchronously when a driving force from a driving means (not shown) is transmitted to their rotation shafts. The absorbent main body continuous body 103 is supplied between the roll 13 and the flat roll, and the absorbent main body continuous body 103 is sandwiched between the seal block body 131 of the seal roll 13 and the flat roll. Control of the drive means of the seal roll 13 and the flat roll is controlled at a predetermined rotational speed by a control means (not shown) provided in the disposable diaper manufacturing apparatus.

  In the manufacturing method of the present embodiment, as shown in FIG. 7, the free end 106 a of the second three-dimensional gather forming belt-like member 106 that forms the second three-dimensional gather 6 is placed on the upper surface of the absorbent main body continuum 103. There is a folding step F for folding in the width direction (X direction) center.

  As shown in FIG. 7, the folding process F uses a pair of guides 12 and 12 disposed on both sides in the transport direction (Y direction) of the transport belt 11 that transports the absorbent main body continuous body 103 in the Y direction. Done. As shown in FIG. 7, the pair of guides 12 and 12 is a metallic plate-like material such as an aluminum alloy or steel, and the distance between the guides gradually increases from the upstream side to the downstream side in the transport direction (Y direction). It is arranged to be narrow. As shown in FIG. 7, the aperture angle θ7 with respect to the conveying direction (Y direction) of the guide 12 is preferably 5 ° to 45 °, and the rising angle θ8 of the leading end portion 12a of the guide 12 (the leading end portion 12a and the conveying belt). Is preferably 5 ° to 45 °. The conveyor belt 11 is an endless belt, and the conveyor belt 11 is driven by a drive roller (not shown), and the base surface of the conveyor belt 11 is sucked by a vacuum means (not shown). Driving of the driving roller is controlled to a predetermined rotational speed by a control means (not shown) provided in the disposable diaper manufacturing apparatus.

  In the manufacturing method of the present embodiment, as shown in FIG. 7, the second raised portion 106 c of the folded second three-dimensional gather forming belt-like member 106 is continuously joined in the transport direction (Y direction). Joining to the upper surface of the absorbent main body continuous body 103 so as to cover the folded up-scheduled portion 105c at every other position of the part 7a so as to cover the folded up expected standing part 105c, thereby forming the second joint part 7b. The second joining step G is performed.

  The second joining step G is performed using a seal roll 13b and a flat roll (not shown) that is a receiving roll. As shown in FIG. 7, the seal roll 13b and the flat roll are arranged opposite to each other in the vertical direction, and are made of a metallic cylindrical shape such as an aluminum alloy or steel. On the peripheral surface of the seal roll 13b, a pair of seal block portions 131b and 131b corresponding to the second joint portion 7b are provided at positions separated in the X direction. The seal block portion 131b is located on the peripheral surface of the seal roll 13b at a position corresponding to every other one of the first joint portions 7a formed in the previous step, and substantially the same position as the first joint portion 7a. It is arranged to correspond. The seal roll 13b and the flat roll are provided so as to rotate synchronously when driving force from a driving means (not shown) is transmitted to their rotation shafts. The absorbent main body continuous body 103 is supplied between the roll 13b and the flat roll, and the absorbent main body continuous body 103 is disposed between the seal block body 131b of the seal roll 13b and the flat roll. Control of the drive means of the seal roll 13b and the flat roll is controlled at a predetermined rotational speed by a control means (not shown) provided in the disposable diaper manufacturing apparatus.

  In the manufacturing method of the present embodiment, as shown in FIG. 7, the second solid body is folded every time between the absorbent bodies 33 between the second joint portions 7 b adjacent in the transport direction (Y direction). There is a refolding step H that raises the free end portion 106a of the gather-forming belt-like portion 106 and folds the absorbent main body 3 outward in the width direction (X direction).

  As shown in FIGS. 7 to 9, the refolding step H includes the first roll 14b, the second roll 15b located on the downstream side of the first roll 14b and above, the first roll 14b, and the second roll. 15b, a folding plate 16b that folds the free end portion 106a of the second three-dimensional gather forming belt-like member 106 outward in the X direction, and a position on the downstream side of the second roll 15b and above it. Then, the pressing is performed by using a holding plate 17b that holds the refolded free end portion 106a as it is.

  As shown in FIGS. 7 and 8, the first roll 14b and the second roll 15b are each made of a metallic cylindrical shape such as an aluminum alloy or steel. As shown in FIG. 7, the first roll 14 b is formed such that the width in the X direction is shorter than the distance between the free end portions 106 a of the pair of second three-dimensional gathering band members 106. Thus, the width of the first roll 14b in the X direction is short, and the second roll 15b on the downstream side is positioned above the first roll 14b as shown in FIG. The free end portion 106a of the second three-dimensional gathering band member 106 that is not joined by the second joining portion 7b between the second joining portions 7b (substantially the same position as the first joining portion 7a) is raised, and FIG. As shown in FIG.

  As shown in FIG. 8, the folding plate 16b is located between the first roll 14b and the second roll 15b, and the conveyance direction (Y direction) of the conveyance belt 11 that conveys the absorbent main body continuous body 103 in the Y direction. A pair is provided on both sides. As shown in FIG. 9, the pair of folded plates 16b, 16b is a metal plate such as an aluminum alloy or steel, and the distance between the upstream and downstream sides in the transport direction (Y direction) is reduced. It is arranged to gradually become wider. As shown in FIG. 9, the angle θ9 with respect to the conveyance direction (Y direction) of the folding plate 16b is preferably 95 ° to 150 °, and the inclination angle θ10 (absorption with the leading end portion 16a) of the leading end portion 16a of the folding plate 16b. The angle of the sexual main body continuum 103 to the top sheet 2 is preferably 45 ° to 85 ° as shown in FIGS.

  As shown in FIGS. 7 and 8, the holding plate 17 b is located on the downstream side of the second roll 15 b, and is provided on both sides of the conveyance belt 11 in the conveyance direction (Y direction) for conveying the absorbent main body continuous body 103 in the Y direction. A pair is provided. As shown in FIGS. 7 and 8, the pair of holding plates 17 b is a metal plate such as an aluminum alloy or steel, and the distance between the upstream side and the downstream side in the transport direction (Y direction). Is arranged so that it gradually becomes wider. Further, the upstream end portion 17a of each pressing plate 17b extends to above the second roll 15b. As shown in FIG. 7, the angle θ11 with respect to the conveying direction (Y direction) of the pressing plate 17b is preferably 95 ° to 150 °, and the inclination angle θ12 (absorbing with the leading end portion 16a) of the leading end portion 17a of the pressing plate 17b. The angle of the sexual main body continuum 103 with the top sheet 2 is preferably 0 ° to 15 °, as shown in FIG.

  In the manufacturing method of the present embodiment, as shown in FIG. 4, the absorbent main body continuum 103 is cut at intervals between the absorbent main bodies 3 adjacent in the transport direction (Y direction), and each absorbent main body 3 is cut. A cutting step is obtained. The cutting step is performed using a known cutting means.

  Next, the manufacturing method of the disposable diaper of this invention is demonstrated, referring drawings based on this embodiment.

  First, an absorbent main body continuous comprising a plurality of absorbent bodies 33, 33... In the conveying direction (Y direction) between the continuous body of the top sheet 31, the continuous body of the back sheet 32, and the continuous body of both sheets. The body 103 is provided with a first three-dimensional gather forming belt-like member 105 provided with an elastic member 52 and an elastic member 62 along both sides of the absorbent body continuous body 103 in the transport direction (Y direction). A continuous body provided with the second three-dimensional gather forming belt-like member 106 is manufactured by a known method. As shown in FIG. 4, each of the free ends 105 a of the pair of first three-dimensional gather-forming band members 105 is centered with respect to the side of the absorbent body continuous body 103 in the transport direction (Y direction). The free end portions 106a of the pair of second three-dimensional gather forming belt-like members 106 are positioned on the outer side with respect to the side portion in the transport direction (Y direction) of the absorbent main body continuous body 103. Is formed.

  As shown in FIG. 4, the continuous body is transported in the transport direction (Y direction) by the transport belt 11, and the first roll 14 having a width shorter than the distance between the pair of free end portions 105 a and the first roll 14. It supplies between the 2nd rolls 15 located above, raises each free end part 105a of a pair of 1st three-dimensional gather formation belt-like member 105, and makes it float up. Next, each of the free end portions 105a floating upward is moved inward in the width direction (X direction) by the pair of folding plates 18 to a position substantially half the width direction (X direction) of the upright portion 105c. At the same time, the pair of folded plates 19 folds outward in the width direction (X direction) at a position that is substantially half the width direction (X direction) of the tilted uprising portion 105c. Is formed to stand upright in a folded state so as to face outward.

  Next, as shown in FIG. 4, in a state where the standing upright portion 105 c is folded, it is supplied between the seal roll 13 and the flat roll, and between the absorbent bodies 33 included in the absorbent main body continuum 103, The pair of seal block portions 131 and 131 corresponding to the first joint portion 7a are sealed, and the upright planned portion 105c in the folded state of each of the first three-dimensional gather forming band members 105 is replaced with the upper surface of the absorbent main body continuum 103. It fixes to (surface sheet 31).

  Next, as shown in FIG. 7, the absorbent main body continuous body 103 fixed by the first joint portion 7 a in a state in which the upright scheduled portion 105 c of each first three-dimensional gathering belt-like member 105 is folded is transferred to the transport belt 11. Is carried in the carrying direction (Y direction). At that time, the pair of guides 12 and 12 causes the free end portions 106a of the pair of second three-dimensional gather forming belt-like members 106 to face the upper surface of the absorbent main body continuous body 103 toward the center in the width direction (X direction). Fold it down.

  Next, as shown in FIG. 7, the second upright planned portions of the second three-dimensional gather forming belt-like members 106 so as to cover the upright planned portions 105 c of the first solid gather-forming belt-like members 105 in a folded state. A continuous body in which 106c is folded is supplied between the seal roll 13b and the flat roll, and is a set of the first joint portions 7a that are continuous in the transport direction (Y direction), and the first joint portion. Each of the second solids folded so as to cover the expected standing portion 105c in a state of being sealed and folded by a pair of seal block portions 131b and 131b corresponding to the second joint portion 7b at substantially the same position as 7a. The second standing upright portion 106 c of the gathering band member 106 is joined to the upper surface (surface sheet 31) of the absorbent main body continuum 103. The 2nd junction part 7b is every other 1st junction part 7a which continues in a conveyance direction (Y direction), Comprising: It is a substantially the same position as each 1st junction part 7a, and between absorption books 33 mutually It is formed every time.

  Next, as shown in FIG. 7, the paper is supplied between the first roll 14 b having a width shorter than the distance between the pair of free ends 106 a and the second roll 15 b positioned above the first roll 14 b, in the conveying direction. Freeness of a pair of second three-dimensional gather forming belt-like members 106 that are not joined by the second joint 7b between the second joints 7b (substantially the same position as the first joint 7a) adjacent in the (Y direction). Each of the end portions 106a is raised and floated upward. Next, each of the free end portions 106a floating upward is refolded outward in the width direction (X direction) by the pair of folding plates 16b. Next, each of the folded uprising portions 106c is pressed in that state by the holding plate 17b, and is conveyed by the conveying belt 11 while being sucked by a vacuum means (not shown).

  Next, the individual absorbent main bodies 3 are obtained by cutting the absorbent main bodies 3 adjacent to each other in the transport direction by a known cutting means. A first three-dimensional gather 5 and a second three-dimensional gather 6 are disposed on both side portions of the absorbent main body 3 in the longitudinal direction (Y direction).

  Next, as shown in FIG. 10, each absorbent main body 3 having the first three-dimensional gathers 5 and the second three-dimensional gathers 6 arranged on both sides thereof is turned 90 ° in the horizontal plane by a reversing device (not shown). Made. That is, the absorbent main body 3 has its longitudinal direction coincided with the conveyance direction, but is changed so that its width direction coincides with the conveyance direction.

  Next, as shown in FIG. 10, the abdomen sheet member continuum 102 </ b> A and the back sheet member continuum 102 </ b> B manufactured in separate steps are conveyed with a predetermined interval in the X direction. It fixes so that the absorptive main body 3 by which the 1st solid gather 5 and the 2nd solid gather 6 were distribute | arranged to both sides may be bridged. The abdominal sheet member continuum 102A and the back sheet member continuum 102B are transported in separate steps between the continuum of the outer sheet 21, the continuum of the inner sheet 22, and the continuum of both sheets. The elastic member 23 extended in the (Y direction) is disposed.

  Here, the absorbent main body 3 is fixed by applying an adhesive to the outer surface of the absorbent main body 3 on the back sheet side by a coating means (not shown). The adhesive is applied to the overlapping part of the absorbent body 3 and the continuous body 102A of the abdominal sheet member and the overlapping part of the absorbent body 3 and the continuous body 102B of the back sheet member. Further, in the case of the diaper 1A (see FIG. 3C) in which each second three-dimensional gather 6 is fixed on the inner layer sheet 22 of the back sheet member 2B, the adhesive is used for each second three-dimensional gather 6. And the back sheet member continuous body 102 </ b> B are also coated. In the case of a diaper in which each second three-dimensional gather 6 is not fixed on the inner layer sheet 22 of the back sheet member 2B, no adhesive is applied to each second three-dimensional gather 6.

  Next, the diaper continuous body 101 obtained by fixing the absorbent main body 3 is folded in half in the width direction (X direction), and then the side seal portions 4 and 4 are heat sealed, ultrasonic sealed, and high frequency sealed. , An adhesive or the like, or a combination of these means. For the formation of the side seal portions 4 and 4, a seal device (not shown) provided with a pair of seal rolls is preferably used. And after formation of the side seal parts 4 and 4, the diaper continuous body 101 is cut | disconnected by the dimension of each diaper 1A with a well-known cutting means (not shown). Thereby, the underpants type disposable diaper 1A of the structure mentioned above is obtained. The diaper continuous body 101 can be cut simultaneously with the formation of the side seal portions 4 and 4.

  Regarding the manufacturing method of the first embodiment, points that are not particularly described can be manufactured in the same manner as the conventional manufacturing method of a so-called cross-flow type pants-type disposable diaper.

  According to the manufacturing method of the present embodiment, the first three-dimensional gather and the second three-dimensional gather are pants-type disposable diapers 1 that are fixed in different shapes at the longitudinal front and rear ends of the absorbent main body (see FIG. 2). ) Can be produced efficiently.

  The manufacturing method of the disposable diaper of this invention is not restrict | limited at all to the manufacturing method of the above-mentioned embodiment, It can change suitably.

  For example, although the disposable diaper 1 manufactured by the manufacturing method of the above-mentioned embodiment is a pants-type disposable diaper in which an exterior body is divided into an abdominal sheet member 2A and a back sheet member 2B, it is not divided. A pants-type disposable diaper may be used. For example, in the manufacturing method of the present embodiment, the absorbent main body 3 in which the first three-dimensional gathers 5 and the second three-dimensional gathers 6 are arranged on both side portions, the continuous body 102A and the back of the ventral sheet member manufactured in a separate process. Although it is fixed to the continuous body 102B of the side sheet member so as to be bridged, as shown in FIG. 11, it is not divided by fixing it on an undivided exterior body manufactured in a separate process. Body pants-type disposable diapers can be manufactured. The undivided exterior body 102 is stretched in the transport direction (Y direction) between a continuous body of one outer layer sheet 21, a continuous body of one inner layer sheet 22, and a continuous body of both sheets in a separate process. The elastic member 23 is arranged using a swing guide (not shown) on the periphery of the position of the plurality of elastic members 23 and the leg opening when it becomes a disposable diaper in the future, and further using a rotary cutter or the like Manufactured by forming leg openings.

  Moreover, although the disposable diaper 1 manufactured by the manufacturing method of the above-mentioned embodiment is a pants-type disposable diaper, a so-called tape-type disposable diaper may be used. For example, in the manufacturing method of the present embodiment, the first three-dimensional gather forming belt-like member 105 in which the elastic member 52 is disposed on each of the absorbent main body continuum 103 along both sides thereof by a known method. A continuous body in which the second three-dimensional gather forming belt-like member 106 in which the elastic member 62 is disposed is manufactured, and the continuous body is processed to manufacture a pants-type disposable diaper, as shown in FIG. In addition, by a known method, a plurality of absorbers 33, 33... In the conveying direction (Y direction) between the continuous body of the top sheet 31, the continuous body of the back sheet 32, and the continuous body of both sheets, Along the absorbent body continuum 103 ′ having a plurality of elastic members 23 extended in the transport direction (Y direction), along each of both sides of the absorbent body continuum 103 ′ in the transport direction (Y direction), Elastic member 52 is arranged The first three-dimensional gather forming belt-like member 105 and the second three-dimensional gather forming belt-like member 106 on which the elastic member 62 is arranged, and further outside the width direction (X direction) of the absorbent main body continuous body 103 ′. A continuous body in which a pair of fastening tapes 100 are arranged on every other absorbent body 33 included in the absorbent main body continuous body 103 ′ so as to protrude in the direction, and the continuous body is processed to form a tape-type disposable. Diapers can be manufactured.

DESCRIPTION OF SYMBOLS 1 Pants type disposable diaper 2A Abdominal sheet member 2a Side part 2B of abdominal sheet member Back side sheet member 2b Side part of a back sheet member 21 Outer layer sheet 22 Inner layer sheet 23 Elastic member 3 Absorbent main body 31 Surface sheet 32 Back sheet 33 Absorber 34 Joint part 4 Side seal part 5 First three-dimensional gather 51 Sheet material 52 Elastic member 5a Free end part 6 Second three-dimensional gather 61 Sheet material 62 Elastic member 6a Free end part 7a First joint part 7b Second joint part 8 Third joint portion 11 Conveying belt 12 Guide 12a Guide tip portions 13, 13b, 13c Seal roll 131, 131b, 131c Seal block portions 14, 14b First roll 15, 15b Second roll 16 Folding plate 16a Tip of folding plate Portion 17 Holding plate 17a Tip 17 of holding plate
18 Folding plate 18a Folding plate tip 19 Folding plate 19a Folding plate tip 20 Pressing plate 20a Pressing plate tip 100 Fastening tape 101 Diaper continuous body 102A Abdominal sheet member continuous body 102B Back sheet member Continuous body 102 Non-split outer body continuous body 103 Absorbent main body continuous body 103 'Absorbent main body continuous body 105 First solid gathering band member 105a Free end 105c Standing up part 106 Second solid gathering band Member 106a free end WO waist opening LO leg opening A ventral side, B dorsal side, C crotch

Claims (1)

A rectangular absorbent main body including an absorbent body, a first three-dimensional gather, and a second three-dimensional gather outside the width direction of the first three-dimensional gather along each of the longitudinal sides thereof,
The fixing state of the first three-dimensional gather and the second three-dimensional gather are different so that the width of the dorsal side portion is wider than the width of the ventral side portion in the ventral side portion and the dorsal side portion of the absorbent main body. A disposable diaper is a manufacturing method of a disposable diaper that continuously conveys an absorbent body continuous body in which the absorbent body is continuous in the longitudinal direction, and continuously manufactures the disposable diaper,
The free end portion of the first three-dimensional gather forming band-shaped member forming the first three-dimensional gather is tilted toward the center in the width direction, and the width direction of the upright planned portion of the first three-dimensional gather forming belt-shaped member A folding step of folding the free end portion outward in the width direction at a position substantially at the center, and forming the expected standing portion in a folded state;
A first joining step in which the folded uprising portion is joined to the upper surface of the absorbent main body continuity between the absorbent bodies that are continuous in the conveying direction, and a first joint portion is formed;
A folding step of folding the free end portion of the second three-dimensional gather forming band-shaped member forming the second three-dimensional gather on the upper surface of the absorbent main body continuum toward the center in the width direction;
Folded second raised portions of the second three-dimensional gather forming belt-shaped member are folded at every other position of the first joints continuous in the transport direction at substantially the same position as the first joints. A second joining step for joining the upper surface of the absorbent main body continuation so as to cover the standing upright part and forming a second joined part;
Raises the free end portion of the folded second solid gathering belt-like portion between the absorbent bodies between the second joint portions adjacent to each other in the conveying direction, and the width direction of the absorbent main body A re-folding process that folds outward,
The manufacturing method of the disposable diaper which comprises the cutting process of cut | disconnecting the said absorptive main body continuous body between every said absorptive main bodies adjacent to a conveyance direction, and obtaining each said absorptive main body.

Images