JP2006198207A - Method of manufacturing absorptive article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing an absorptive article hardly turning up or folding a front side part in the advancing direction of an expansible sheet when sticking the running expansible sheet to a surface sheet or the like. <P>SOLUTION: The method of manufacturing the absorptive article 1 has a process of joining elastic strands 91 to a base material sheet 11, folding one side part 11a of the base material sheet 11, inserting the elastic stands 91 in the folded part to form the expansible sheet 10, and sticking the expansible sheet 10 to the surface sheet 2 or a back face sheet 3. In forming the expansible sheet 10, the other side part 11b of the base material sheet 11 is also folded, and the folded part is fixed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for producing various absorbent articles including disposable diapers and sanitary napkins.

  The present applicant has previously proposed a stretchable sheet pasting method and a pasting device for pasting a disposable diaper at a waist position to form a waist gather (see Patent Documents 1 and 2). According to this method and apparatus, the elastic sheet can be successfully attached to the waist position of the diaper under the stretched state, and thus the gathered diaper is formed at the waist position, and leakage from around the waist occurs. Is effectively prevented.

  When affixing the stretchable sheet to the waist position of the diaper, the stretchable sheet is affixed to a traveling diaper while being held by a predetermined holding means that rotates around a central axis, for example, a hook-and-loop fastener. As a result, on the front side in the traveling direction of the stretchable sheet, the sheet may be turned up and folded by wind pressure, and may be stuck to the diaper in the folded state. Such a diaper does not have a good appearance, and in some cases, the formation of waist gathers is insufficient, and leakage may easily occur.

Japanese Patent No. 2810732 JP-A-9-294769

  Accordingly, an object of the present invention is to provide a method for producing an absorbent article that can eliminate the above-mentioned drawbacks of the prior art.

In the present invention, the elastic strand is joined to the base material sheet in the stretched state, the base material sheet is folded at one side, and the elastic strand is sandwiched between the folded portions, so that the base material sheet and the elastic material A method for producing an absorbent article, which includes a step of forming a stretchable sheet having strands, and then affixing the stretchable sheet to a topsheet or a backsheet,
In forming the stretchable sheet, the object is achieved by providing a method for manufacturing an absorbent article in which the other side portion of the base sheet is folded back and the folded portion is fixed.

  According to the manufacturing method of the present invention, the front portion in the traveling direction of the stretchable sheet has a double structure that is folded and fixed, so that the wind pressure is applied when the traveling stretchable sheet is attached to the topsheet or the like. Even if it receives, it will become difficult to turn up and bend over to the front part, and the pasting can be performed successfully.

  The present invention will be described below based on preferred embodiments with reference to the drawings. First, the absorbent article manufactured according to the preferable method of this invention is demonstrated. FIG. 1 shows a perspective view of a disposable diaper which is an example of an absorbent article manufactured according to a preferred method of the present invention. FIG. 2 shows a plan view of the state in which the diaper shown in FIG. 1 is stretched as seen from the top sheet side.

  The diaper 1 is an unfolded type provided with a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a liquid-retaining absorbent 4 interposed between the two sheets. The diaper 1 has a crotch part A at the center in the longitudinal direction, and a back side part B and a ventral part C that extend from the crotch part A in the longitudinal direction. Side flaps S are formed on both sides of the back side B, and a fastening tape FT is attached to the side flaps S. A hook member (not shown) of a mechanical fastener is attached to the fastening tape FT. As this hook member, those known in the technical field can be used without particular limitation. A landing tape 5, which is a portion to which the fastening tape FT is fastened, is attached to the surface of the back sheet 3 in the ventral side C.

  The diaper 1 has an hourglass-like shape in which both side edges of the crotch part A are curved in an arc shape and the central part in the longitudinal direction is bound inward as a whole. The top sheet 2 has a substantially rectangular planar view shape having an outer dimension larger than that of the absorber 4, and is arranged in the center in the width direction of the back sheet 3. The back sheet 3 has an hourglass-like outer shape that matches the outer shape of the diaper. The top sheet 2 and the back sheet 3 extend outward from both side edges 41, 41 and both end edges 42a, 42b of the absorber 4, respectively, and are joined to each other at their extending portions. Both side portions of the back sheet 3 in the longitudinal direction extend outward in the width direction from both side edges of the top sheet 2.

  A pair of three-dimensional gathers 6 and 6 and a pair of leg gathers 7 and 7 are formed on both sides of the diaper 1 in the longitudinal direction by disposing elastic strands. The three-dimensional gathers 6 are each formed by arranging a three-dimensional gather forming sheet material 62 having elastic strands 61 so as to extend from the outer side to the inner side of both side edges of the top sheet 2. Each sheet material 62 is a surface sheet linearly across the longitudinal direction of the diaper between the side edge 41 of the absorbent body 4 and a leg elastic strand 71 described later by a known joining means such as heat seal or adhesive. 2 is fixed. The elastic strands 61 arranged in each three-dimensional gather 6 have a thread-like form, and a plurality of elastic strands 61 are arranged substantially parallel to the free end 63 of each three-dimensional gather 6. The leg gather 7 is formed by arranging a plurality of leg portion elastic strands 71 and 71 substantially linearly. Each of the elastic strand 61 and the leg elastic strand 71 is disposed along the longitudinal direction of the diaper 1, and is disposed between the back side portion B and the ventral side portion C.

  A waist elastic band 81 is provided on the waist part D of the back side part B and the abdominal side part C to form a waist elastic part 8, and both sides of the waist part E of the back side part B are formed. Are provided with a plurality of waistline elastic strands 91 to form a pair of side stretchable parts 9, 9. As shown in FIG. 2, the waistline portion E of the back side portion B has the diaper 1 in a state (tensed state) in which the elastic members of the respective portions are stretched and expanded in a planar shape, with the back side portion B side on the upper side, When the abdominal side C side is considered as the lower side, it is a part located below the crotch part A and below the part where the waist elastic member 81 is disposed.

  The main part of the waist part D and waist part E of the back side part B and the waist part D of the abdominal side part C is shown by Fig.3 (a) and (b). In the back side part B, the waist part D and the waist part E are comprised from the 1st elastic sheet 10a. Thereby, the waist elastic part 8 and the side elastic part 9 are formed. On the other hand, in the ventral side portion C, the waist portion D is composed of the second stretchable sheet 10b. Thereby, the waist elastic part 8 is formed. Each of the stretchable sheets 10 a and 10 b is sandwiched and fixed between the top sheet 2 and the back sheet 3.

The principal part of each expansion-contraction sheet | seat 10a, 10b is shown by Fig.4 (a) and (b). The first elastic sheet 10 a is a composite having the base sheet 11, the waistline elastic strand 91, and the waist elastic band 81. The base material sheet 11 consists of fiber sheets, such as a nonwoven fabric and paper. Examples of the constituent material include various synthetic resins, natural fibers such as pulp, and regenerated fibers such as rayon. The basis weight of the substrate sheet 11 is generally 10 to 50 g / m ^2, softness, texture, it is preferable in terms of cost in particular 15 to 30 g / m ^2.

  A waist elastic band 81 is fixed to one side edge extending in the longitudinal direction of the base material sheet 11 along the side edge in an extended state. The other side portion of the base sheet 11 is folded back to the upper surface side of the sheet 11 to have a double structure. A plurality of waistline elastic strands 91 are sandwiched in a folded portion having a double structure and fixed in an extended state. The waistline elastic strands 91 are arranged at substantially equal intervals so as to extend in the longitudinal direction of the base sheet 11. In the central part A and the front and rear end parts B in the longitudinal direction of the stretchable sheet 10a, a large number of crimping parts 12a and 12b formed by embossing are formed in the part where the base sheet 11 is folded back to form a double structure. Has been. In the region where the crimping portions 12a and 12b are formed, the waistline elastic strand 91 sandwiched and fixed to the folded base sheet 11 is cut, and the waistline elastic strand 91 does not exist in the region. Or, even if it exists, it is not stretched. Accordingly, the waistline elastic strand 91 exhibits elasticity only between the central portion A and the front end portion and the rear end portion B.

  The second elastic sheet 10b is a composite having a base sheet 11 and a waist elastic band 81 made of the same material as the first elastic sheet 10a. The base material sheet 11 is fixed to one side edge extending in the longitudinal direction thereof in a stretched state with a waist elastic band 81 along the side edge. The other side portion of the base sheet 11 is folded back to the upper surface side of the sheet 11 to have a double structure. A large number of crimping portions 12 formed by embossing are formed in a portion where the base sheet 11 is folded to form a double structure. Thereby, the said folding | turning part in the base material sheet 11 is being fixed.

  The preferable manufacturing method of the diaper which has the above structure is demonstrated below. The following method is a process of forming the waist stretchable portion 8 and the side stretchable portion 9 on the back side portion B and forming the waist stretchable portion 8 on the ventral side portion C in the manufacturing process of the diaper 1. FIG. 5 shows a schematic diagram of a main part of a suitable manufacturing apparatus used for carrying out the manufacturing method of the present invention. The apparatus 100 shown in FIG. 5 manufactures an elastic sheet composed of the first elastic sheet 10a and the second elastic sheet 10b shown in FIGS. 4A and 4B described above, and the elastic sheet is used as a surface sheet. It is an apparatus which performs the process until it sticks to.

  An adhesive is applied from the adhesive application device 101 to one surface of the long sheet of the base sheet 11 fed from a raw fabric (not shown). The state of application of the adhesive is as shown in FIG. The adhesive 102 is applied so as to extend in the longitudinal direction of the base sheet 11 with a predetermined width. Application is performed intermittently in the longitudinal direction of the base sheet 11. Accordingly, the non-applied portion 102a of the adhesive is formed between the areas where the adhesive 102 is applied.

  The base sheet 11 in the state shown in FIG. 6A is introduced into the folding device 103 shown in FIG. 5, and both left and right sides thereof are folded back to the upper surface side of the base sheet 11. As the folding device 103, a folding device known in the technical field, for example, the device described in Japanese Patent Application Laid-Open No. 2004-180787 related to the earlier application of the present applicant can be used. The folded state of the base material sheet 11 is shown in FIG. As for the base material sheet 11, the 1st side part 11a and the 2nd side part 11b are return | folded by the upper surface side of the base material sheet 11, respectively. In this case, the folding width of the first side portion 11a is larger than the folding width of the second side portion 11b. The folded width of the first side portion 11a is a width that is sufficient for the adhesive 102 previously applied to be covered by the folded first side portion 11a.

  Returning again to FIG. 5, the both sides of the base sheet 11 are folded back in the folding device 103, and simultaneously, a plurality of waistline elastic strands 91 are supplied to the base sheet 11. The elastic strand 91 is supplied at the folded portion of the first side portion 11a as shown in FIG. 6 (b). Since the adhesive 102 (see FIG. 6A) is applied to the folded portion, the elastic strand 91 is fixed to the folded portion by supplying the elastic strand 91 thereto. It is caught.

  As shown in FIG. 5, the base material sheet 11 on which the waistline elastic strands 91 are arranged is applied with an adhesive from the second adhesive application device 104. The adhesive is applied in a band shape so as to extend in the longitudinal direction of the base sheet 11 between the folded portion of the first side portion 11a and the folded portion of the second side portion 11b. As shown in FIG. 5, a waist elastic band 81 is supplied onto the adhesive. As a result, as shown in FIG. 6C, the elastic band 81 is formed between the folded portion of the first side portion 11 a and the folded portion of the second side portion 11 b in the substrate sheet 11. 11 so as to extend in the longitudinal direction. That is, the elastic band 81 is bonded and fixed in parallel with the elastic strand 91.

  The base material sheet 11 on which the waist elastic band 81 is arranged is then introduced into a pressure bonding device 107 having a pair of rolls 105 and 106 as shown in FIG. The base sheet is pressed between the rolls 105 and 106 and subjected to predetermined processing. The structure of the roll 105 is shown in FIG. The roll 105 is made of a metal pattern roll having a large number of convex portions 115 formed on the peripheral surface in a predetermined pattern. The roll 105 has a first region 116 in which a large number of convex portions 115 are formed only in a part of the circumferential direction with a predetermined width, and a large number of convex portions 115 are formed in a whole area or a part of the circumferential direction with a predetermined width. And a second region 117 on the peripheral surface thereof. Although not shown, the roll 105 has a third region in which a large number of convex portions are formed at a position 180 degrees opposite to the first region 116. The third region has the same width as the first region 116, and the length in the roll circumferential direction is shorter than that of the first region 116. Of the peripheral surface of the roll 105, portions other than the first region 116 and the second region 117 are smooth. The convex portion 115 may protrude from a smooth surface on the peripheral surface of the roll 105, or may be formed by engraving the smooth surface. The convex portion 115 in the first region 116 and the convex portion 115 in the second region may have the same shape or different shapes. On the other hand, the roll 106 is made of metal or resin, and is a smooth roll (anvil roll) whose entire peripheral surface is smooth.

  A first region 116 and a third region (not shown) in the roll 105 are provided at positions corresponding to the folded portion of the first side portion 11 a in the base sheet 11 introduced into the crimping device 107. . On the other hand, the second region 117 is provided at a position corresponding to the folded portion of the second side portion 11 b in the base sheet 11. The circumferential length of the roll 105 is substantially the same as the width of the waist portion D of the diaper 1. Moreover, the length between the 1st area | region 116 and 3rd area | region (not shown) in the roll 105 is substantially half of the width | variety of the waist part D of the diaper 1. FIG.

  When the base sheet 11 is introduced into the crimping device 107, as shown in FIG. 6D, the sheet 11 is sandwiched between a pair of rolls 105 and 106 to form a crimping portion corresponding to the convex portion 115. Is done. In this case, since the second region 117 of the roll 105 is formed over the entire circumference of the roll 105, the pressure-bonding portion formed by the base sheet 11 being sandwiched between the second region 117 and the roll 106. 12 is continuous (or intermittent) extending in the longitudinal direction of the base sheet 11. On the other hand, since the first region 116 and the third region (not shown) of the roll 105 are provided intermittently in the circumferential direction of the roll 105, the base sheet 11 has the first region 116 and the roll 106. The pressure-bonding part 12 a formed by being pressed by and is intermittently positioned in the longitudinal direction of the base material sheet 11. Similarly, the crimping part 12 b formed by pressing the base sheet 11 between a third region (not shown) and the roll 106 is also intermittently positioned in the longitudinal direction of the base sheet 11. The crimping parts 12a and 12b are regularly positioned with a certain interval.

  The conveyance of the base sheet 11 and the rotation of the rolls 105 and 106 are such that the first region 116 of the roll 105 faces the roll 106 and, at the same time, the adhesive non-application part 102 (see FIG. 6) of the base sheet 11. (See (a)). Similarly, the third region in the roll 105 is synchronized so as to be positioned in the adhesive non-application part 102a (see FIG. 6A) of the base sheet 11 at the same time as facing the roll 106. . As a result, the first region 116 and the third region (not shown) and the roll 106 are pressed to be positioned in the adhesive non-applied portion 102a (see FIG. 6A) of the base sheet 11. The pressure-cutting of the waistline elastic strand 91 to be performed is performed. Since the elastic strand 91 is stuck on the base material sheet 11 in a stretched state, the stretched state of the elastic strand 91 that has been in the stretched state is released by the above-described cutting, and contracts in the front-rear direction from the cutting position. To do.

  The rolls 105 and 106 may not be heated, or may be heated to a predetermined temperature as necessary. When heating, the temperature generally depends on the material of the elastic strands 91 and the base sheet 11, the number of the elastic strands 91, the transport speed of the base sheet 11, and the like, but generally 30 to 250 ° C, particularly 50 to 150 ° C. It is preferable to do. By performing such heating, only the elastic strand 91 can be cut at a high speed without cutting the base sheet 11. Further, the pressure applied by the rolls 105 and 106 depends on the thickness of the elastic strand 91 and the base sheet 11, the number of the elastic strands 91, the transport speed of the base sheet 11, etc., but generally 100 to 3000 N / cm in linear pressure, In particular, it is preferably 1000 to 2000 N / cm. By pressurizing within such a range, only the elastic strand 91 can be easily cut without damaging the base sheet 11.

  As described above, in the present embodiment, the first side portion 11a of the base sheet 11 is folded back, and the elastic strand 91 is sandwiched between the folded portions, and then the folded portion is pressed so that only the elastic strands 91 are spaced at regular intervals. Disconnected with Further, only the elastic strand 91 is cut and the folded portion of the second side portion 11b of the base sheet 11 is pressed by the pair of rolls 105 and 106, and the folded portion of the first side portion 11a is formed. Is pressed to cut only the elastic strand 91, and at the same time, the folded second side portion 11b of the base sheet 11 is pressurized to fix the folded portion. Therefore, a process of fixing the folded second side portion 11b separately using an adhesive or the like is not required, and manufacturing efficiency and apparatus simplification can be achieved. In addition, by fixing the folded second side portion 11b as described above, there is also an advantage that a so-called dry edge does not occur at the folded end portion.

  In this way, a continuous body of the stretchable sheet 10 is formed as shown in FIG. The formed continuous body of stretchable sheets 10 is then sent to a stretchable sheet reverse holding device 108 shown in FIG. The inversion holding device 108 includes a rotation center shaft 110, a support shaft 109 having one end attached to the center shaft 110, a holding portion 111 attached to the other end of the support shaft 109 and holding the stretchable sheet 10. Have The holding portion 111 is configured to rotate in a direction indicated by an arrow in FIG. 5 by supporting one end portion of the support shaft 109 on the rotation center shaft 110. A plurality of holding portions 111 are provided with respect to the rotation center shaft 110.

  When each holding portion 111 rotates and approaches the uppermost position of the reverse holding device 108, the rotation speed is reduced and the interval between the adjacent holding portions 111 is narrowed. When completed, the distance between the holding portions 111 is accelerated and the stretchable sheet 10 can be fixed to the surface sheet 2 described later at a predetermined pitch.

  The inversion holding device 108 has a mechanism for rotating the direction of the holding unit 111 by 90 degrees while each holding unit 111 rotates around the rotation center axis 110. Specifically, each holding portion 111 rotates in a direction indicated by an arrow in FIG. 5 until it is orthogonal to the direction. This rotation is performed after the continuous body of the elastic sheet 10 is cut by the cutter 112 and until the elastic sheet 10 reaches a position of a tucker roll 113 described later. Further, the holding unit 111 passes through the position of the tucker roll 113 and returns to the original direction until it comes into contact with the expandable sheet 10 again at the uppermost position of the reverse holding device 108. Thereby, the stretchable sheet 10 is formed under the state in which the base sheet 11 is run along its longitudinal direction, and then the stretchable sheet 10 is rotated 90 degrees and is run along its width direction. It can affix on the surface sheet made to run along the longitudinal direction.

  Each holding part 111 is provided with a holding means that makes surface contact with the elastic sheet 10 and holds the elastic sheet 10 in an extended state. As the holding means, for example, a suction holding mechanism, or both a locking holding mechanism and a suction holding mechanism can be used. By using both the locking and holding mechanism and the suction holding mechanism, the sheet 10 can be reliably held regardless of the breathability of the stretchable sheet 10. When the stretchable sheet 10 has air permeability, the setting of the holding force can be made finer than when the holding is performed only by the locking and holding mechanism, and the sheet 10 can be attached to the surface sheet 2. It can be performed more smoothly. As the locking and holding mechanism, locking pieces provided at the front and rear ends of the holding portion 111 in the rotation direction can be used. As the locking piece, for example, a surface fastener or a sprayed member having a roughened film formed by spraying a metal material or a non-metal material can be used. Such a thermal spray member is configured to hold the breathable sheet by the frictional force caused by the uneven surface.

  The continuous body of the stretchable sheet 10 held in the extended state by the holding unit 111 is cut at a front position and a rear position of the holding unit 111 by a cutter 112 provided in the middle of the rotation path of the holding unit 111 and has a predetermined length. become. The cutting position of the continuous body of the elastic sheet 10 is the position of the crimping part 12b shown in FIG. This position is an adhesive non-application part 102a (see FIG. 6A). In order to cut a continuous body of the stretchable sheet 10 held in an extended state, for example, a saw blade knife cutter, a cutter combining a knife and an anvil, a shear cutter, a heat cutter, a water jet cutter, a rotating disc cutter, a rotation Various cutters such as a fan cutter and a flat blade knife cutter can be used.

  A tucker roll 113 for pressing and fixing a long object of the topsheet 2 to the holding section 111 side is provided at the lowest position where the holding section 111 rotates and the cut and stretchable sheet 10 contacts the topsheet 2. It is arranged.

  Of the holding means provided in the holding unit 111, the suction holding of the stretchable sheet 10 is released after the pressing by the tucker roll 113 is completed. Accordingly, the suction holding of the stretchable sheet 10 by the holding means is started when the holding unit 111 reaches the uppermost position of the reverse holding device 108 or the vicinity thereof, and is released when it reaches the lowermost position or the vicinity thereof. .

  The stretchable sheet 10 that has been cut and in a leaf state rotates toward the lowermost position of the reverse holding device 108 while being held by the holding unit 111. Along with this rotation, the holding unit 111 is rotated 90 degrees with respect to this rotation direction. The stretchable sheet 10 travels along the width direction when the holding unit 111 rotates 90 degrees. Under this traveling state, the stretchable sheet 10 is affixed to a long object of the topsheet 2 that has traveled along the longitudinal direction.

  Before the long object of the top sheet 2 is introduced to the tucker roll 113, an adhesive is applied to one surface of the sheet 2 by the third adhesive application device 114. After the adhesive is applied, as shown in FIG. 8, the stretchable sheet 10 is attached to the long object of the top sheet 2 at the position of the tucker roll 113. In this case, the traveling direction of the stretchable sheet 10 is a direction indicated by an arrow in the drawing. That is, the second side portion 11b side of the stretchable sheet 10 is the front side in the traveling direction. As described above, since the second side portion 11b has a double structure that is folded and fixed, it is difficult for the second side portion 11b to be turned up or folded even when subjected to wind pressure. Therefore, the stretchable sheet 10 is successfully attached to the top sheet 2.

  The stretchable sheet 10 has a double structure in which the front side in the traveling direction is folded and fixed, and the rear side in the traveling direction is also folded and fixed. Therefore, the thickness of the four corners of the sheet 10 is the same. As a result, the conditions for attaching the stretchable sheet 10 to the top sheet 2 are constant at the four corners, and there is an advantage that the application can be performed more successfully.

  In this way, as shown in FIG. 9, the stretchable sheet 10 is stuck on the long object of the topsheet 2 with a constant interval. The space | interval between the elastic sheets 10 corresponds with the length of the longitudinal direction of the target diaper. Next, the long object of the top sheet 2 to which the stretchable sheet 10 is attached is cut along the longitudinal center line C of the elastic band 81 over the width direction. Alternatively, the longitudinal center of the elastic band 81 is formed after the absorbent body and the back sheet (not shown) are overlapped and joined to the long sheet of the top sheet 2 to which the stretchable sheet 10 is attached. Along the line C, it is cut across the width direction. Thereafter, the same processing steps as in the conventional manufacturing method are performed, and the target diaper 1 is obtained.

  The present invention is not limited to the embodiment. For example, the elastic sheet 10 does not necessarily have the waist elastic band 81. Moreover, it may replace with the thing of the form shown in FIG.6 (d), and may use the elastic sheet 10 'shown to Fig.10 (a) and (b). The stretchable sheet 10 ′ is configured to fold back the first side portion 11a of the base sheet 11 and sandwich and fix a part of the plurality of waistline elastic strands 91 to the folded portion. The second side portion 11b of the sheet 11 is folded, and the remaining portion of the plurality of elastic strands 91 is sandwiched and fixed to the folded portion. The produced elastic sheet 10 ′ is disposed between the top sheet 2 and the back sheet 3. Also in the stretchable sheet 10 ′, when the sheet 10 ′ is attached to the top sheet 2, it is difficult to turn up or turn back to the front side in the traveling direction, and the attachment can be performed successfully. In this case, it is preferable that the elastic strand 91 is supplied to the folded end of the folded sheet 11b of the base material sheet. By doing so, it becomes easy to bring the cutting position for cutting the long sheet of the top sheet 2 to which the stretchable sheet 10 ′ is pasted in the width direction and the position of the elastic strand 91 close to each other.

  The stretchable sheet 10 ′ shown in FIGS. 10 (a) and 10 (b) is a long surface sheet that has been run along the longitudinal direction in a state in which the stretchable sheet 10 ′ is rotated 90 degrees and run along the width direction. Affixed to objects. Next, the long sheet of the top sheet is cut in the width direction while avoiding the portion where the stretchable sheet 10 ′ is pasted.

  Moreover, in the said embodiment, although the expansion-contraction sheet | seats 10 and 10 'were affixed on the surface sheet 2, you may affix on the back surface sheet 3 instead of this.

  Moreover, in the said form, although the adhesive agent which joins the elastic strand 91 and the base material sheet 11 was apply | coated intermittently in the longitudinal direction of the base material sheet 11, it replaces with this and an adhesive agent is used for the base material sheet 11. You may apply | coat continuously to a longitudinal direction. In addition, when the elastic strand 91 and the base sheet 11 are joined, the adhesive may be directly applied to the elastic strand 91 instead of applying the adhesive to the base sheet 11.

  In the above embodiment, the elastic strand 91 is cut and the folded portion of the second side portion 11b is pressed and fixed at the same time. Instead, the elastic strand 91 is cut first, and then the second strand is cut. You may press-fix the folding | returning part of the side part 11b. Alternatively, first, the folded portion of the second side portion 11b may be pressure-fixed, and then the elastic strand 91 may be cut.

  Moreover, in the elastic sheet 10a shown to Fig.4 (a), although the part shown by the code | symbol 12a, 12b was crimped | bonded, instead of this or in addition to this, the folding | turning edge part of the base material sheet 11 is continuously made. You may pressurize and make it crimp.

  Moreover, although the said embodiment is an example which applied the manufacturing method of this invention to the disposable diaper, this invention is applicable similarly to absorbent articles other than a disposable diaper.

FIG. 1 is a perspective view showing a disposable diaper which is an example of an absorbent article manufactured according to a preferred method of the present invention. FIG. 2 is a plan view of the state in which the diaper shown in FIG. 1 is stretched as seen from the top sheet side. Fig.3 (a) is a top view which shows the principal part of the back side part and abdominal side part of a diaper, and FIG.3 (b) is the bb sectional view taken on the line in Fig.3 (a). FIG. 4A is a perspective view showing the main part of the first elastic sheet, and FIG. 4B is a perspective view showing the main part of the second elastic sheet. FIG. 5 is a schematic diagram showing a main part of a suitable manufacturing apparatus used for carrying out the manufacturing method of the present invention. 6A to 6D are perspective views showing states of the base sheet at the positions indicated by a to d in FIG. FIG. 7 is a schematic diagram showing a structure of a roll provided in the crimping apparatus. FIG. 8 is a perspective view showing a state in which the elastic sheet is attached to the top sheet. FIG. 9 is a perspective view showing a state in which a large number of stretchable sheets are attached to a long surface sheet. FIG. 10A is a plan view (corresponding to FIG. 3A) showing another embodiment of the present invention, and FIG. 10B is a cross-sectional view taken along the line bb in FIG. 10A. is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Back sheet 4 Absorber 10 Elastic sheet 11 Base material sheet 81 Waist part elastic band 81
91 Girth elastic strand 91

Claims (11)

The elastic strand is joined to the base sheet under the stretched state, the base sheet is folded on one side, and the elastic strand is sandwiched between the folded portions, and the base sheet and the elastic strand are stretched. A method for producing an absorbent article, comprising a step of forming a sheet and then affixing the stretchable sheet to a top sheet or a back sheet,
A method of manufacturing an absorbent article in which the other side portion of the base material sheet is folded back when the stretchable sheet is formed, and the folded portion is fixed.   The manufacturing method according to claim 1, wherein the base sheet is made of nonwoven fabric or paper.   The manufacturing method according to claim 1 or 2, wherein one side portion of the base sheet is folded and the elastic strand is sandwiched between the folded portions, and then the folded portion is pressed to cut the elastic strand at a constant interval.   The manufacturing method of Claim 3 which pressurizes the other side part of the said base material sheet | seat folded up, and fixes the folding | turning part simultaneously with pressurizing the said folding | turning part and cut | disconnecting only the said elastic strand. Cutting only the elastic strands and pressurizing the folded portion of the other side of the base sheet are performed by pinching with a pair of rolls,
The pair of rolls comprises a smooth roll and a pattern roll in which a number of convex portions are formed in a predetermined pattern on the peripheral surface,
The pattern roll has a first region in which a large number of the convex portions are formed only in a part of the circumferential direction with a predetermined width, and a large number of the convex portions are formed in a part of the circumferential direction with a predetermined width. The manufacturing method of Claim 4 which has a 2nd area | region in the surrounding surface.   The stretchable sheet is formed under a state in which the base sheet travels along the longitudinal direction, and then the stretchable sheet is rotated 90 degrees and traveled along the width direction in the longitudinal direction. The manufacturing method in any one of Claim 1 thru | or 5 which affixes on the said surface sheet traveled along.   A reversing device comprising: a rotation center shaft; a support shaft having one end portion attached to the center shaft; and a holding portion attached to the other end portion of the support shaft and holding the stretchable sheet. The manufacturing method according to claim 6, wherein the stretchable sheet is rotated by 90 degrees using a reversing device having a mechanism for rotating the direction of the holding portion by 90 degrees while rotating around the rotation center axis.   The manufacturing method according to claim 7, wherein the holding portion includes a suction holding mechanism and / or a locking holding mechanism for the stretchable sheet. Fold one side of the base material sheet, and sandwich and fix a part of the plurality of elastic strands to the folded portion,
The manufacturing method according to any one of claims 1 to 8, wherein the other side portion of the base sheet is folded and the remaining portion of the plurality of elastic strands is sandwiched and fixed to the folded portion.   A portion where the stretchable sheet is rotated 90 degrees and traveled along the width direction, and is pasted to the long object of the topsheet traveled along the longitudinal direction, and then the stretchable sheet is pasted The manufacturing method of Claim 9 which cuts | disconnects the elongate thing of this surface sheet in the width direction. An elastic band is bonded and fixed in parallel with the elastic strand between a portion where one side portion of the base sheet sheet is folded and fixed and a portion where the other side portion is folded and fixed. Forming an elastic sheet,
Under the state where the formed stretchable sheet is rotated 90 degrees and traveled along the width direction, it is attached to the long object of the topsheet traveled along the longitudinal direction,
The manufacturing method according to claim 1, wherein a long object of the top sheet to which the stretchable sheet is attached is cut along a longitudinal center line of the elastic band.

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