JP2013252450A - Absorbent article, and method and device for producing stretchable sheet used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a request for a device capable of efficiently producing a low-cost stretchable sheet using a rubber thread.SOLUTION: A device for producing a stretchable sheet wherein a rubber thread in a stretch state is joined between a pair of sheets in an arrangement state includes: a pair of rubber thread feeding devices 32A-32D disposed at intervals from each other, for transferring the rubber thread 19cW from one end side to the other end side; a turn head 31 turning around the rubber thread feeding devices 32A-32D on one end side of the rubber thread feeding devices 32A-32D, and paying out the rubber thread 19cW such that the rubber thread 19cW is wound around the rubber thread feeding devices 32A-32D in the stretch state; and a pair of junction rolls 33 which are disposed on the other end side of the rubber thread feeding devices 32A-32D, and wherein the pair of strip-like sheets 19aW, 19bW are fed in a state where the sheets 19aW, 19bW pinch the rubber thread 19cW in the stretch state led to the other end side of the rubber thread feeding devices 32A-32D between the sheets 19aW, 19bW and that the sheets 19aW, 19bW are overlapped with each other, for integrally joining them.

Description

  The present invention relates to an apparatus for producing an elastic sheet using thread rubber, a method for producing the same, and an absorbent article using the elastic sheet.

  In the unfolded disposable diaper, Patent Document 1 proposes an improvement in the fit of the disposable diaper when the side flap portion and the fastening tape are made stretchable. The deployable disposable diaper disclosed in Patent Document 1 uses a composite material that can be elastically stretched as a fastening tape. This composite material is obtained by sandwiching thread rubbers aligned in an expanded state between two sheets and integrally joining them. Generally, thread rubber is meandered along the longitudinal direction of the sheet, or a plurality of thread rubbers arranged in parallel with each other along the longitudinal direction of the sheet are cut along the width direction of the sheet. Obtained by.

JP 2009-72472 A

  However, when an elastic composite material having elasticity in the longitudinal direction of the sheet is used as a side flap part or a main body part of a fastening tape, the elastic composite material can be attached to the disposable diaper along the longitudinal direction for the production of the disposable diaper. Can not. For this reason, at the time of attachment to a disposable diaper, the direction of the stretchable composite material has to be changed by 90 degrees, and there is a problem that attachment to the disposable diaper is difficult.

[Object of invention]
An object of the present invention is to provide a stretchable sheet manufacturing apparatus that can be easily attached to a disposable diaper without changing its orientation as a side flap portion or a fastening tape main body portion, a manufacturing method thereof, and an absorption using the stretchable sheet. It is to provide a sex article.

  A first aspect of the present invention is a pair of thread rubber feeders that are arranged at a distance from each other to transfer the rubber thread from one end side to the other end side, and one end of the pair of rubber thread feeders. The swivel head that feeds the rubber thread and the other end of the pair of rubber thread feeders so that the rubber thread is swung around the pair of rubber threads and wound around the pair of rubber thread feeders. A pair of belt-like sheets are fed in an overlapped state with the stretched rubber thread guided to the other end of the thread rubber feeding device in between and are joined together A pair of joining rubber rolls, the pair of rubber thread feeders being arranged at an interval from each other, and the rubber thread feeders can be driven independently of each other. In the device.

  In the present invention, the rubber thread fed from the swivel head is wound around one end side of the pair of rubber thread feeders in an extended state, and is transferred to the other end side by the rubber thread feeder. In this way, the stretched rubber thread wound spirally from one end side to the other end side of the pair of rubber thread feeders is fed between the pair of joining rolls together with the pair of belt-shaped sheets. A pair of belt-like sheets are overlapped with each other while a stretched rubber thread is sandwiched between them by a pair of joining rolls, and these are joined together.

  In order to overlap and bond a pair of belt-like sheets together with the thread rubber, a coating head for applying a thermoplastic adhesive to at least one overlapping surface of the pair of sheets is disposed upstream of the pair of bonding rolls. be able to.

  According to a second aspect of the present invention, a pair of rubber thread feeders arranged to be spaced apart from each other for transferring the rubber thread from one end side to the other end side, and one ends of the pair of rubber thread feeders The swivel head that feeds the rubber thread and the other end of the pair of rubber thread feeders so that the rubber thread is swung around the pair of rubber threads and wound around the pair of rubber thread feeders. A pair of belt-like sheets are fed in an overlapped state with the stretched rubber thread guided to the other end of the thread rubber feeding device in between and are joined together A pair of joining rubber rolls, and a stretchable sheet manufacturing apparatus using two stretchable sheet manufacturing apparatuses in which two pairs of rubber thread feeders are arranged with a space between each other. It is larger than the width of the sheet of rubber A step of holding in a meandering state along the longitudinal direction of the belt-like sheet in width, and a pair of belt-like sheets stacked on each other with a rubber thread in an extended state held in a meandering state in between, A step of integrally joining each other, and the step of maintaining the meandering state includes the step of winding the rubber thread around a pair of rubber thread feeders arranged at a distance from each other, and the belt-shaped sheet Aligning the portions of the rubber thread to be overlapped with each other, and aligning the portions of the rubber thread to be overlapped with the belt-shaped sheet to each other in two diagonal positions. In the manufacturing method of an elastic sheet | seat characterized by including the step which makes the transfer speed of a rubber feeder different from the transfer speed of two thread rubber feeders in the other diagonal position. .

  The elastic sheet obtained in the present invention is a meandering thread rubber continuously along the longitudinal direction of the belt-like sheet, and the elastic force of the rubber thread acts mainly in the width direction of the belt-like sheet. Results in shrinking.

  In the stretchable sheet manufacturing apparatus according to the first aspect of the present invention, for cutting a stretched rubber thread interposed between a pair of belt-shaped sheets fed from a pair of joining rolls and a pair of thread rubber feeders. Can further comprise a cutter.

  In the method for producing a stretchable sheet according to the second aspect of the present invention, the step of maintaining the meandering state includes a step of winding the rubber thread around a pair of rubber thread feeders spaced apart from each other. Good.

  Similarly, the step of holding in a meandering state can include aligning the portions of the rubber thread that are superimposed on the belt-like sheet in parallel to each other.

  A step of superimposing a pair of belt-like sheets on each other with the stretched rubber thread in between and joining them together is a non-bonding area for the rubber thread at both ends in the width direction of the belt-like sheet. May be included. In this case, it is possible to further include a step of cutting the rubber thread protruding in an extended state from the end in the width direction of the integrally formed belt-like sheet.

  The method may further comprise a step of cutting a pair of belt-like sheets integrally joined with the stretched rubber thread in the width direction along the longitudinal direction thereof.

  The third aspect of the present invention is a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber disposed between the top sheet and the back sheet, and a rear body region of the back sheet. An absorbent article comprising a fastening tape that protrudes from both left and right side edges of the backsheet and is joined to the front body region of the backsheet, wherein the fastening tape is manufactured by the method according to the second aspect of the present invention. An elastic sheet is included, and one end in the width direction of the elastic sheet is joined to the back body region of the back sheet.

  In the present invention, a fastening tape that protrudes from the left and right edge portions of the back body region of the back sheet when the absorbent article is worn is overlapped and joined to the front body region of the back sheet. In this case, the rubber thread that constitutes a part of the elastic sheet of the fastening tape extends in the direction around the wearer's waist, and exerts the effect of closely adsorbing the absorbent article around the wearer's waist.

  The absorbent article according to the third aspect of the present invention further includes a hook-and-loop fastener arranged in the front body region of the back sheet, and the hook-and-loop fastener that is releasably joined to the hook-and-loop fastener is in the width direction of the elastic sheet. It may be arranged on the other end side.

  According to the stretchable sheet manufacturing apparatus of the present invention, the stretched rubber thread that meanders along the longitudinal direction is integrally joined between a pair of belt-shaped sheets, and as a result, stretches along the width direction. It is possible to produce a stretchable sheet having a property.

  The length of the belt-like sheet when it further comprises a cutter for cutting the stretched rubber thread interposed between the pair of belt-shaped sheets fed from the pair of joining rolls and the pair of rubber thread feeders. The tension of the rubber thread along the direction can be eliminated.

  When a coating head for applying a thermoplastic adhesive on at least one overlapping surface of a pair of sheets is arranged upstream of the pair of joining rolls, the stretched rubber thread is formed on the pair of belt-shaped sheets. Fast and reliable joining is possible.

  According to the method for producing a stretchable sheet of the present invention, a stretched rubber thread meandering along the longitudinal direction is integrally joined between a pair of belt-shaped sheets, and stretchable along the width direction. It is possible to obtain an elastic sheet having In this case, the rubber thread in the stretched state can be easily meandered along the longitudinal direction of the sheet by winding the rubber thread around a pair of rubber thread feeders arranged at a distance from each other. Further, by aligning the portions of the thread rubber that are superimposed on the belt-shaped sheet, the tension generated by each thread rubber can be accurately aligned in the width direction of the sheet.

  According to the method for producing a stretchable sheet of the present invention, a stretched rubber thread meandering along the longitudinal direction is integrally joined between a pair of belt-shaped sheets, and stretchable along the width direction. It is possible to obtain an elastic sheet having

  It includes a step of forming non-bonding regions for the rubber thread at both ends in the width direction of the belt-shaped sheet, and in particular, cuts the rubber thread protruding in an extended state from the width-direction end of the belt-shaped sheet that is integrally bonded In the case of further comprising the step of performing, the folded portion of the rubber thread can be brought into a non-bonded state with respect to the sheet. As a result, it is possible to avoid the tension along the longitudinal direction of the sheet from acting on the sheet.

  In the case of having a step of cutting in the width direction along the longitudinal direction of a pair of belt-like sheets integrally joined with the stretched rubber thread sandwiched in a direction perpendicular to the expansion and contraction direction A stretchable sheet of an arbitrary length can be obtained along.

  According to the absorbent article of the present invention, the continuous direction of the continuous sheet of the top sheet and the back sheet when the absorbent article is manufactured and the continuous body of the elastic sheet manufactured by the method according to the second aspect of the present invention. The conveyance direction can be matched. As a result, it is possible to avoid complication of equipment for joining the stretchable sheet to the back sheet and / or the top sheet.

  When a hook-and-loop fastener is arranged in the front body region of the back sheet and the hook-and-loop fastener that is detachably joined to the hook-and-loop fastener is arranged on the other end in the width direction of the elastic sheet, the back sheet is inserted through the elastic sheet. The back body region can be repeatedly peeled from the front body region.

It is a three-dimensional projection figure showing the use condition of one Embodiment of the absorbent article by this invention. It is the top view which fractured | ruptured partially the inner side of embodiment shown in FIG. 1 in the expansion | deployment state. It is an expanded sectional view of the III-III arrow in FIG. It is a fracture | rupture top view which represents typically the continuous body of the fastening tape in embodiment shown in FIG. It is a top view which represents typically one Embodiment of the elastic sheet manufacturing apparatus by this invention for manufacturing the continuous body of the fastening tape shown in FIG. It is a side view of the elastic sheet manufacturing apparatus shown in FIG. It is a VII-VII arrow sectional view in Drawing 6. In the embodiment shown in FIG. 5, it is the geometric drawing which represents typically the external appearance of the wound state of a rubber thread. FIG. 9 is a plan view corresponding to FIG. 8. It is the top view which fractured | ruptured partially another embodiment of the absorbent article by this invention in the expansion | deployment state.

  Embodiments in which the absorbent article according to the present invention is applied to an unfoldable diaper will be described in detail with reference to FIGS. 1 to 4. The “absorbent article” in the present invention is an infant or a nursing diaper. Including adult incontinence products. Therefore, it should be noted that the present invention is not limited to such an embodiment, but can be modified and modified in any way included in the concept of the present invention described in the claims.

  FIG. 1 shows the appearance of the unfolded diaper in the present embodiment in use, FIG. 2 shows the unfolded shape, and FIG. 3 shows the sectional structure taken along the line III-III in FIG. That is, the unfoldable diaper 10 in this embodiment includes a liquid-impermeable back sheet 11, a liquid-permeable center top sheet 12c and a pair of side top sheets 12s (hereinafter collectively referred to as a top sheet 12). And the absorber 13. The absorber 13 is disposed between the back sheet 11 and the top sheet 12 that are overlapped with each other, and these are integrally joined.

  In the present embodiment, the inner portions (the center side in FIG. 2) of the left and right side top sheets 12s that cover the left and right sides of the center top sheet 12c are not joined to the center top sheet 12c. In order to form the three-dimensional gather 14 in the inner portion, the rubber thread 15 is joined in an extended state to the inner edge of the side top sheet 12s. The back sheet 11 and the top sheet 12 have a pair of front and rear side flap portions 16f and 16r extending outward from both side edges of the absorbent body 13 in the width direction. In the crotch region C between the side flap portions 16f and 16r, a pair of pull-out portions 18 that form the leg opening 17 is formed on the wearer.

  The base end portions of a pair of left and right fastening tapes 19 are attached to both side edges in the width direction of the side flap portion 16r on the rear body region R side so as to overlap and connect the side flap portions 16f on the front body region F side when worn. It has been. The side flap portion 16r on the rear body region R side is overlapped with the side flap portion 16f on the front body region F side via the fastening tape 19, so that the leg opening 17 is formed due to the presence of the pull-out portion 18. This fastening tape 19 is composed of a stretchable sheet having stretchability along its width direction, and a continuous tape 19W of a fastening tape having a web shape as shown in FIG. As shown by a two-dot chain line, it is obtained by cutting at regular intervals. The fastening tape 19 in the present embodiment includes an upper sheet 19a, a lower sheet 19b, a thread rubber 19c, and a hook-and-loop fastener 19d. Since the thread rubber 19c is joined in an expanded state between the upper sheet 19a and the lower sheet 19b via an adhesive 19e, the region where the thread rubber 19c is joined is the width direction of the fastening tape 19 (in FIG. 4). , In the horizontal direction). The hook-and-loop fastener 19d can be releasably bonded to the hook-and-loop fastener sheet 20 bonded to the back sheet 11 on the front body region F side. Accordingly, the fastening tape 19 is stretched so that the thread rubber 19c is in an extended state and joined to the hook-and-loop fastener sheet 20 in the front body region F, so that an appropriate tightening force can always be applied to the wearer's waist. it can.

  Further, an elastic sheet 21 around the waist is joined in an expanded state between the back sheet 11 and the top sheet 12 on the rear body region R side of the unfolded diaper 10. The waist elastic sheet 21 is disposed along the waist opening 22 and has a function of forming a waist gather 23 to improve the fit of the wearer around the waist. Similarly, leg-around elastic members 24 are arranged from the crotch region C along the outer longitudinal direction of both side edges of the absorbent body 13 to the front body region F side and the back body region R side. The leg elastic member 24 is fixed in an extended state between the back sheet 11 and the top sheet 12, and has a function of forming a leg gather 25 to improve the fit around the wearer's leg.

  Therefore, in a state where such a deployable diaper 10 is worn, urine and feces are guided onto the top sheet 12 and moisture is absorbed by the absorber 13 through the top sheet 12.

  FIG. 5 schematically shows a planar shape of the above-described fastening tape continuous body 19W manufacturing apparatus, FIG. 6 shows its side shape, and FIG. 7 shows a cross-sectional shape taken along line VII-VII in FIG. That is, this apparatus includes a swivel head 31 that feeds the thread rubber continuum 19cW and thread rubber feeders 32A, 32B, 32C, and 32D (hereinafter, these may be collectively referred to as the thread rubber feeder 32). A pair of joining rolls 33 and a cutter 34 for cutting the continuous thread rubber 19cW are provided.

The swivel head 31 is attached to the distal end of a swivel arm 35 whose inside is hollow, and a hollow arm drive shaft 36 provided at the base end of the swivel arm 35 is rotatably supported with respect to the gantry 37. The thread rubber continuum 19cW is disposed at the one end side of the thread rubber feeding device 32 from the tip of the swivel head 31 through a thread rubber passage (not shown) formed inside the arm drive shaft 36 and the swivel arm 35. It is adapted to be fed out in a stretched state to P _S. An arm drive motor 38 for turning the turning head 31 together with the turning arm 35 around the arm drive shaft 36 is attached to the gantry 37. A power transmission mechanism 39 for transmitting the rotational force from the arm drive motor 38 to the arm drive shaft 36 is incorporated between the arm drive motor 38 and the arm drive shaft 36. Accordingly, the turning head 31, feeding the continuum 19cW rubber thread while turning these around at the rubber thread feeding device 32 one end side of the thread rubber wound start position P _S of. Accordingly, the continuum 19cW rubber thread is adapted to be wound under tension to the thread rubber wound start position P _S at one end of the rubber thread feeding device 32.

In the present embodiment, the pair of rubber thread feeders 32 spaced apart in the left-right direction (the left-right direction in FIG. 5) from the width dimension of the fastening tape continuous body 19W is formed in the up-down direction (in FIG. (Direction) is also provided with a space between each other. That is, in this embodiment, a total of four rubber thread feeders 32A, 32B, 32C, and 32D are equidistant from the rotation axis of the arm drive shaft 36 and are arranged so as to surround them. Rubber thread feeding device 32, to transfer the continuum 19cW rubber thread from the thread rubber wound start position P _S of one end side to another end side of the joining position P _E. Each rubber thread feeder 32 includes an endless belt 40, a pair of pulleys 41 around which the endless belt 40 is wound, a bracket 42 that rotatably supports the pair of pulleys 41, a belt drive motor 43, and the like. The power transmission mechanism 44 is provided. That is, each of the rubber thread feeders 32A to 32D can drive the endless belt 40 independently at an arbitrary speed. The belt drive motor 43 is for driving one of the pulleys 41, and the power transmission mechanism 44 is incorporated between the belt drive motor 43 and one of the pulleys 41, and is supplied from the belt drive motor 43. A rotational force is transmitted to the pulley 41. The pair of pulleys 41 are arranged on the bracket 42 so as to be spaced apart from each other along the axial direction of the arm drive shaft 36, and the portion of the belt 40 farthest from the axis of the arm drive shaft 36 defines the rubber thread conveying portion 40 t. To do. By moving the belt 40 located in the thread rubber transporting section 40t, the thread rubber continuous body 19cW is spirally wound around the four thread rubber feeding devices 32. The thread rubber transport section 40t is an area where the belt 40 is in contact with the thread rubber continuum 19cW, and the pulley 41 of each thread rubber feeder 32 is rotated so that the other portions do not contact the thread rubber continuum 19cW. The axis is tilted as appropriate (see FIG. 7). In particular, in FIG. 7, the pair of left and right thread rubber feeders 32C and 32D located on the upper side are greatly inclined so as not to interfere with the transfer path of the continuous thread rubber 19cW to a pair of joining rolls 33 described later. Please note that.

In the present embodiment, in FIG. 7, two thread rubber feeders 32A in which the transfer speed V2 of the belt 40 of the _two rubber thread feeders 32B and 32D at one diagonal position is at the other diagonal position. It is set higher than the transport speed _{V 1} of the 32C. This is because the thread rubber continuum 19cW joined between the upper sheet continuum 19aW and the lower sheet continuum 19bW is aligned in parallel with each other. In other words, it is necessary to orthogonal joining position _{P E} in a pair of left and right rubber thread feeding device 32A, 32B and 32C, the continuum 19cW of rubber thread to be passed over to 32D with respect to the axis of the arm drive shaft 36. Here, FIG. 8 schematically shows the relationship between the thread rubber transporting portion 40t of the four thread rubber feeding devices 32A to 32D and the thread rubber continuous body 19cW wound around them, and its planar shape is shown in FIG. Show. Thread rubber wound start position _{P S} in the rubber thread feeding device 32B, the contact point of the rubber thread wound around the 32D of the rubber thread transport unit 40t _{b n, d} n (contact rubber thread feeding device 32A, rubber thread transport unit of 32C The direction A _n B _n , C _n D _n of the thread rubber continuous body 19cW spanned around the contact points _An and C _n of the thread rubber wound around 40t is orthogonal to the transport direction of the thread rubber transport unit 40t. . in other words, the rotation of the rubber thread feeding device 32 in a direction _a n _B n of the continuum 19cW rubber thread wound around each of the rubber thread transport unit _40t, C n _{D n} a pair of bonding rolls 33 at the joining position _{P E} set parallel to the axis. Accordingly, rubber thread feeding device 32B, the rubber thread feeding device 32A a transfer rate _{V 2} of 32D belt 40, 32C by following than transport speed _{V 1} of the belt 40 It is necessary to increase as. Here, assuming that the contact position of the continuum 19cW rubber thread against the belt 40 is not displaced by the frictional force during its transport, the thread rubber wound start position P _S and the joining position P _E The distance along the transfer direction of the thread rubber continuous body 19cW by the thread rubber feeding device 32 is L, the winding width of the thread rubber continuous body 19cW wound around the thread rubber feeding apparatus 32 is W, and the yarn in this winding width direction for _.V 1 = _{V 2} to the inclination angle of the continuum 19cW rubber and theta, rubber thread feeding device 32B, the contact position _b n of the continuum 19cW rubber thread for 32D, _{d n} is the rubber thread feeding device 32A , the contact position _a n of the continuum 19cW rubber thread for 32C, with respect to _{C n,} shifted by Wtanθ along the transfer direction of the continuum 19cW rubber thread. Accordingly, rubber thread feeding device 3 A, at the time 32C of the belt 40 is moved by a distance L, to set the moving speed _{V 2} such as to move the thread rubber feeder 32B, 32D of a belt 40 by a distance (L + Wtanθ). That is, L / _V 1 = It will be understood from the relationship (L + Wtanθ) / V ₂ that the condition V ₂ = V ₁ (L + Wtanθ) / L should be satisfied.

  However, when it is not necessary to align the thread rubber continuous body 19cW joined between the upper sheet continuous body 19aW and the lower sheet continuous body 19bW in parallel with each other, all the rubber thread feeding devices 32A to 32A- The 32D transfer speed can be set equal. In this case, it is possible to further simplify the installation by providing only one pair (two units) of the rubber thread feeder 32 on the left and right. Also, the thread rubber continuum 19cW joined between the upper sheet continuum 19aW and the lower sheet continuum 19bW is alternately opposite to the width direction of the fastening tape 19 (left and right in FIG. 2). Note that it will meander in a meandering manner.

  In any case, the rubber thread continuum 19cW in the stretched state is meandering along the longitudinal direction with an amplitude larger than the width dimension of the belt-like upper sheet continuum 19aW and lower sheet continuum 19bW. Will be held. And it joins integrally in the state pinched | interposed between the continuous body 19aW of an upper sheet | seat, and the continuous body 19bW of a lower sheet | seat.

Between a pair of bonding rolls 33 disposed in the rubber thread feeding device 32 on the other end side of the joining position P _E that is set downward, guided and continuum 19bw continuum 19aw and the lower sheet of the upper sheet . Further, a rubber thread continuum 19cW shaped into a rectangular wave shape is guided in an expanded state from the rubber thread feeder 32 between them. An adhesive 19e is applied to at least one of the overlapping surfaces of the upper sheet continuous body 19aw and the lower sheet continuous body 19bw forming a pair of strips. Along the conveying direction of the continuous body 19aw of the upper sheet and the continuous body 19bw of the lower sheet that form a pair of belts, the adhesive 19e is placed on a predetermined region of these overlapping surfaces on the upstream side of the pair of joining rolls 33. A coating head (not shown) for coating is provided.

  The adhesive 19e supplied from the coating head may be a known thermoplastic adhesive, generally a hot melt adhesive. The adhesive 19e is not applied to the entire area of the upper sheet continuous body 19aW or the lower sheet continuous body 19bW, and non-bonding regions Z to which the adhesive 19e is not applied are formed at both ends in the width direction. ing. Accordingly, the stretched rubber thread portion superimposed on the application area of the adhesive 19e is integrated with the upper sheet continuous body 19aW and the lower sheet continuous body 19bW to form a fastening tape continuous body 19W. Gives elasticity along the direction. On the other hand, the portion of the rubber thread intervening in the non-bonded area Z that is out of the application area of the adhesive 19e is not bonded to the upper sheet continuous body 19aW and the lower sheet continuous body 19bW. Therefore, it should be noted that this portion does not provide stretchability to the upper sheet 19a and the lower sheet 19b. That is, the pair of joining rolls 33 includes an upper sheet continuous body 19aW and a lower sheet continuous body 19bW and an extended thread rubber continuous body 19cW guided to the other end of the rubber thread feeding device 32. Are joined together. The left and right ends of the pair of joining rolls 33 are rotatably supported by the frame 45 via bearings (not shown). A power transmission mechanism 47 is incorporated between the roll drive motor 46 installed on the frame 45 and one longitudinal end portion of one joining roll 33. The power transmission mechanism 47 is for driving and rotating the pair of joining rolls 33 to integrally join the upper sheet continuous body 19aW and the lower sheet continuous body 19bW and the thread rubber continuous body 19cW.

Cutter 34 is disposed between the end of the thread rubber feeding device 32A, mounted respectively to the brackets 42 of the 32B, the joining position P _E and rubber thread transport unit 40t located on the lower side. Thus, after being joined to the continuum 19bW continuum 19aW and the lower sheet of the upper sheet at the joining position P _E, protruding from these widthwise end under tension between the rubber thread feeding device 32 The continuous thread rubber continuous body 19cW is cut.

  In this way, a sheet continuum is obtained in which the thread rubbers 19c are aligned in parallel with each other along the width direction of the upper sheet continuum 19aW and the lower sheet continuum 19bW. To this continuous sheet, a continuous surface fastener 19dW is overlapped and joined to one end in the width direction of the lower sheet continuous body 19bW (the front end side of the fastening tape 19), and the continuous fastening tape as shown in FIG. A body 19W is obtained. Thereafter, the base end side (the other end side in the width direction) of the fastening tape 19 obtained by cutting this at a predetermined interval in the longitudinal direction is joined between the back sheet 11 and the side top sheet 12c. In this case, the conveying direction of the fastening tape continuous body 19W and the conveying direction of the continuous body of the back sheet 11 and the continuous body of the side top sheet 12s can be set in the same direction. For this reason, the trouble of rotating the direction of the fastening tape 19 separated from the fastening tape continuous body 19W by 90 degrees is not required, and the complexity of the manufacturing equipment can be avoided.

  The adhesive 19e is continuous in the longitudinal direction (vertical direction in FIG. 4) of the upper sheet continuous body 19aW and the lower sheet continuous body 19bW in the application region, and in the width direction (in FIG. 4). It is preferable to apply at intervals in the horizontal direction). In this case, the thread rubber 19c is intermittently joined along the expansion and contraction direction to the upper sheet continuous body 19aW and the lower sheet continuous body 19bW. As a result, the gathering of the fastening tape 19 formed by the thread rubber 19c can be softened by the area where the adhesive 19e does not exist.

  The diaper using the stretchable sheet as described above is not limited to the above-described embodiment, and can be applied to, for example, an unfolded diaper shown in the unfolded state in FIG. In the embodiment shown in FIG. 10, elements having the same functions as those of the previous embodiment are denoted by the same reference numerals. The fastening tape 19 in this embodiment is one in which a fastener sheet 19f, to which a hook-and-loop fastener 19d is attached in advance, is sandwiched between an upper sheet 19a and a lower sheet 19b and fixed integrally. In addition, independent flap sheets 26 are joined to the left and right sides of the front body region F of the back sheet 11, and the same function as the side flap portion 16f in the previous embodiment is provided together with the fastening tape 19 disposed on the rear body region R side. I try to make it. Also in this embodiment, the rubber thread 19c is joined to the fastening tape 19 in an extended state, and functions as a stretchable sheet having stretchability around the wearer's waist.

  As described above, the present invention should be construed only from the matters described in the scope of the claims, and in the above-described embodiments, the matters described in all the changes and modifications included in the concept of the present invention are described. Other than possible. That is, all matters in the above-described embodiment are not intended to limit the present invention, and include any configuration not directly related to the present invention. To get.

DESCRIPTION OF SYMBOLS 10 Unfolding type diaper 11 Back sheet 12c Center top sheet 12s Side top sheet 13 Absorber 14 Three-dimensional gather 15 Rubber thread 16f, 16r Side flap part 17 Leg opening part 18 Pull-out part 19 Fastening tape 19a Upper sheet 19aW Continuous upper sheet Body 19b Lower sheet 19bW Lower sheet continuous body 19c Yarn rubber 19cW Yarn rubber continuous body 19d Surface fastener 19dW Surface fastener continuous body 19e Adhesive 19f Fastener sheet 19W Fastening tape continuous body 20 Surface fastener sheet 21 Elastic waist sheet 22 Waist circumference opening 23 Waist gather 24 Leg elastic member 25 Leg gather 26 Flap sheet C Inseam area F Front body area R Rear body area Z Joining region 31 Turning head 32A, 32B, 32C, 32D Yarn rubber feeding device 33 Joining roll 34 Cutter 35 Turning arm 36 Arm drive shaft 37 Mount 38 Arm drive motor 39 Power transmission mechanism 40 Belt 40t Yarn rubber transporting part 41 Pulley 42 Bracket 43 between the belt drive motor 44 power transmission mechanism 45 frame 46 roll drive motor 47 power transmission mechanism V _{1, V 2} belt feed rate P _S rubber thread wound start position P _E joining position L rubber thread wound starting position and the bonding position Distance W Wrap width of thread rubber continuum θ Inclination angle of thread rubber continuum with respect to winding width direction

Claims (3)

A pair of rubber thread feeders arranged to be spaced apart from each other and for transferring the rubber thread from one end to the other end;
A swivel head that swirls around these ends at one end of the pair of thread rubber feeders and feeds the rubber thread so that the thread rubber is wound around the pair of thread rubber feeders in an extended state.
A pair of belt-like sheets arranged on the other end side of the pair of rubber thread feeders are overlapped with each other with the stretched rubber thread guided to the other end of the rubber thread feeder in between. And a pair of joining rolls for integrally joining them. The pair of rubber thread feeders are arranged at a distance from each other, and the rubber thread feeders are independently provided. A stretchable sheet manufacturing apparatus characterized by being drivable. A pair of rubber thread feeders arranged to be spaced apart from each other for transferring the rubber thread from one end side to the other end side, and swiveling around these at one end side of the pair of rubber thread feeders. A swivel head for feeding the rubber thread, and a pair of belt-shaped sheets arranged on the other end side of the pair of rubber thread feeders so that the rubber thread is wound around the pair of rubber thread feeders in an extended state. It is fed in a state where the stretched rubber thread guided to the other end side of the rubber thread feeder is overlapped with each other, and a pair of joining rolls for integrally joining them, A method for producing a stretchable sheet using a stretchable sheet producing apparatus in which the pair of rubber thread feeders are arranged with a space therebetween,
Holding the stretched rubber thread in a meandering state along the longitudinal direction of the belt-like sheet with an amplitude larger than the width of the belt-like sheet;
A step of holding a pair of belt-shaped sheets sandwiched between stretched rubber bands held in a meandering state and mutually joining them together, and maintaining the meandering state, Winding the rubber thread around a pair of rubber thread feeders spaced apart from each other, and aligning the portions of the rubber thread superimposed on the belt-shaped sheet with each other. The step of aligning the portions of the rubber thread superimposed on the sheet to be formed with each other includes the transfer speeds of the two rubber thread feeders at one diagonal position and the two rubber thread feeders at the other diagonal position. The manufacturing method of the elastic sheet | seat characterized by having the step which makes the transfer speed | rate differ. A liquid-permeable topsheet;
A liquid-impermeable backsheet;
An absorber disposed between the top sheet and the back sheet;
A method according to claim 2, comprising: an absorbent article comprising: a fastening tape protruding from left and right side edges of the back body region of the backsheet and joined to the front body region of the backsheet. An absorptive article comprising the elastic sheet manufactured in (1), wherein one end side in the width direction of the elastic sheet is joined to a rear body region of the back sheet.

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