JP2020054741A - Manufacturing method of stretchable sheet and manufacturing apparatus of stretchable sheet - Google Patents

Abstract

To suppress cut of a rubber thread when forming a bonding part of sheets by using a pressure roller where a plurality of projections are intermittently provided in a rotation direction and a crimping part.SOLUTION: A manufacturing method of a stretchable sheet supplies a sheet (11) and a rubber thread (14) at a supply angle position in a rotation direction of a pressure roller (25) where a plurality of projections (251) are provided intermittently in a rotation direction and a rotary shaft direction via a rubber thread (14) between a folding back part (11A) and a non-folding back part (11B) of the sheet, and forms a bonding part (j) regulating a position of the rubber thread (14) by crimping the folding back part (11A) and the non-folding back part (11B) at a bonding angle position. An angle difference between the supply angle position and the bonding angle position is larger than an angle difference from angle positions where a first projection (251a) and a second projection (251b) adjacent in the rotation direction are respectively provided.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for manufacturing a stretchable sheet and a manufacturing apparatus for a stretchable sheet.

  As a method of manufacturing an elastic sheet, a method of attaching a stretched thread rubber between sheets with an adhesive is known. On the other hand, in Patent Literature 1, a sheet in which an extended thread rubber (wire-like element) is disposed between a folded portion and a non-folded portion of a sheet is passed between a pair of rollers to press the sheet, A method for forming a connection is disclosed. On one roller, a plurality of protrusions are formed intermittently in the direction of rotation of the roller and in the direction of the rotation axis. Therefore, connection portions are formed on both sides of the thread rubber so as to cross the thread rubber and intermittently in the direction in which the thread rubber expands and contracts. In a narrow portion formed between the connection portions on both sides of the thread rubber, the thread rubber in a state where tension is lost can be fixed, and the thread rubber can be attached to the sheet. Thus, by attaching the thread rubber to the sheet without using the adhesive, it is possible to suppress a decrease in the shrinkage performance of the thread rubber and a decrease in the flexibility of the stretchable sheet due to the curing of the adhesive.

Japanese Patent No. 3212615

  However, in Patent Literature 1, the folded sheet and the thread rubber are not wound around the rollers but are supplied linearly between the pair of rollers. Therefore, if the position of the thread rubber in the rotation axis direction is not accurately adjusted, the thread rubber is supplied between the pair of rollers in a state where the thread rubber is not contained in the grooves between the protrusions arranged in the rotation axis direction, and the thread rubber is cut. Would.

  In particular, when the protrusions are intermittently arranged in the rotation direction of the roller, even if a part of the thread rubber is wound around the roller, if the amount of winding is small, the gap between the protrusions adjacent in the rotation direction, that is, the thread There is a case where the thread rubber is supplied to a position where the protrusion does not exist on both sides of the rubber. In this case, it is difficult to determine the position of the thread rubber in the rotation axis direction, and it is difficult for the upstream thread rubber to be guided to the groove. As a result, the thread rubber supplied on the convex portion is directly supplied between the pair of rollers, and the thread rubber is cut.

  The present invention has been made in view of the above-described problems, and in the production of an elastic sheet in which thread rubber is interposed between a folded portion and a non-folded portion of a sheet, in the rotation direction and the rotation axis direction. It is an object of the present invention to suppress cutting of thread rubber when forming a joint portion of a sheet using a pressure roller and a pressure portion provided with a plurality of convex portions intermittently.

The main invention for achieving the above object is a step of interposing a rubber thread between a folded portion of a sheet and a non-folded portion of the sheet, and a plurality of convex portions intermittently in a rotation direction and a rotation axis direction. A step of supplying the sheet and the thread rubber to the pressure roller in a state where they are not bonded to each other at a supply angle position in the rotation direction of the pressure roller provided with A plurality of joints that press-bond the folded portion and the non-folded portion to each other by using the pressure roller and the pressure portion that contacts the pressure roller, Forming the plurality of joints for regulating the position, the plurality of protrusions having a first protrusion and a second protrusion adjacent to each other in the rotation direction, and The angle difference between the angular position at which the first convex portion is provided in the direction and the angular position at which the second convex portion is provided in the rotational direction, the difference between the supply angular position and the joining angular position. This is a method for producing a stretchable sheet, wherein the angle difference is larger.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

  According to the present invention, in the production of an elastic sheet in which thread rubber is interposed between a folded portion and a non-folded portion of a sheet, a pressure roller provided with a plurality of convex portions intermittently in a rotation direction and a rotation axis direction. When forming the joint portion of the sheet using the and the pressure bonding portion, cutting of the rubber thread can be suppressed.

It is a top view of the elastic sheet 10 manufactured by the manufacturing method of this embodiment. FIG. 2A is a schematic sectional view of the elastic sheet 10 of FIG. 1, and FIG. 2B is a schematic sectional view of the elastic sheet 10 of a modification. FIG. 3A is a schematic perspective view of the pants-type disposable diaper 1 using the elastic sheet 10, and FIG. 3B is a schematic plan view of the pants-type disposable diaper 1 in an expanded state and an extended state. It is an outline sectional view of manufacturing device 20 of an elastic sheet in a 1st embodiment. FIG. 5A is an explanatory view of the surface of the anvil roller 25 and the horn roller 26, and FIG. 5B is a schematic enlarged view of the closest part between the anvil roller 25 and the horn roller 26. 6A and 6B are explanatory diagrams of a method of attaching the thread rubber 14 by the joint j. FIG. 7A is a schematic view of the stretch sheet manufacturing apparatus 20 as viewed from above, and FIG. 7B is an explanatory view of a process in the folding member 23. It is a schematic sectional drawing of the manufacturing apparatus 20 of a stretchable sheet in 2nd Embodiment. It is a schematic sectional drawing of the manufacturing apparatus 20 of the elastic sheet in 3rd Embodiment.

At least the following matters will be made clear by the description in the present specification and the accompanying drawings.
A step of interposing a thread rubber between the folded portion of the sheet and the non-folded portion of the sheet, and the rotation direction of the pressure roller provided with a plurality of convex portions intermittently in the rotation direction and the rotation axis direction; Supplying the sheet and the thread rubber to the pressure roller in a state where they are not joined to each other at the supply angle position, and contacting the pressure roller and the pressure roller at the joint angle position in the rotational direction. Forming a plurality of joints for crimping the folded portion and the non-folded portion and joining the folded portions together with the non-folded portion, wherein the plurality of joints regulate the position of the thread rubber in the expansion and contraction direction. And wherein the plurality of protrusions include a first protrusion and a second protrusion adjacent to each other in the rotation direction, and the first protrusion in the rotation direction is provided. An angle difference between the supply angle position and the joining angle position is larger than an angle difference between an angle position and an angle position where the second convex portion is provided in the rotation direction. This is a method for producing a functional sheet.

  According to such an elastic sheet manufacturing method, the folded portion can be fixed to the non-folded portion by the joint portion, and the position of the thread rubber can be regulated. Further, the thread rubber can enter the groove of the pressure roller before the thread rubber passes between the pressure roller and the pressure portion, and the upstream thread rubber can be easily guided to the groove. Therefore, cutting of the rubber thread at the time of forming the joint can be suppressed.

  In the method for manufacturing an elastic sheet, a part of the sheet is folded in a predetermined direction to form the folded portion, and in the predetermined direction, the length of the folded portion is longer than the length of the non-folded portion. And supplying the sheet such that the non-folded portion is positioned closer to the pressure roller than the folded portion in the supplying step.

  According to such an elastic sheet manufacturing method, the non-folded portion that is long in the rotation axis direction is directly wound around the pressure roller, so that the sheet can be stably conveyed. Therefore, the joint can be formed with the folded end of the sheet kept clean.

  In the method for manufacturing an elastic sheet, a part of the sheet is folded in a predetermined direction using a folding member to form the folded part, and the folded part is formed in a downstream direction of the folding member in a sheet conveyance direction. Along with the thread rubber to join the sheet.

  According to such an elastic sheet manufacturing method, the movement of the thread rubber in the rotation axis direction can be suppressed from being restricted by the folding member, and the thread rubber can easily enter the groove of the pressure roller.

  The method for manufacturing an elastic sheet, wherein the rubber thread is interposed between the non-folded portion and a second sheet overlapping one side in the thickness direction of the non-folded portion, and Supplying the laminate in which the folded portion is superimposed on the one side in the thickness direction of the sheet of (i) to the pressure roller.

  According to such a method for manufacturing a stretchable sheet, it is possible to suppress displacement between the respective sheets and the thread rubber of the stretchable sheet.

  In the method for producing an elastic sheet, a laminate in which all the other sheets of the elastic sheet and the sheet are laminated is supplied to the pressure roller.

  According to such a method for manufacturing a stretchable sheet, it is possible to suppress displacement between the respective sheets and the thread rubber of the stretchable sheet. Further, since the thread rubber and the sheet closer to the pressure roller than the thread rubber can be supplied at the same timing, the sheet easily bends into the groove of the pressure roller and the thread rubber easily enters the groove.

  In the method for manufacturing an elastic sheet, the press-back roller and a press roller that comes into contact with the press-contact roller at a pressing angle position upstream of the joining angle position in the rotation direction, and the folded-back portion is used. And the step of pressing the non-folded portion, and the angular position where the first convex portion is provided in the rotational direction, and the angular position where the second convex portion is provided in the rotational direction. The angle difference between the supply angle position and the pressing angle position is larger than the angle difference of (1).

  According to such an elastic sheet manufacturing method, the thread rubber can enter the groove of the pressure roller before the thread rubber passes between the pressure roller and the press roller, and guides the upstream thread rubber to the groove. Easier to do. Therefore, cutting of the rubber thread at the time of forming the joint can be suppressed.

  In the method for manufacturing an elastic sheet, the pressing step includes pressing a folded end of the sheet using the pressure roller and the press roller.

  According to such a method for manufacturing a stretchable sheet, a joint can be formed with the folded edge of the sheet kept clean.

  In the method for manufacturing an elastic sheet, a part of the sheet is folded back to one side in a predetermined direction to form the folded part, and the length of the folded part in the predetermined direction is the length of the non-folded part. A second joining portion that is shorter than the length of the joining portion and that joins the folded portion and the non-folded portion by crimping in the step of forming the joined portion, wherein the one of the folded portions in the predetermined direction is Forming the second joint portion that is disposed across the side edge.

  According to such an elastic sheet manufacturing method, the end of the folded portion is firmly joined to the non-folded portion, and peeling of the folded portion can be suppressed.

  Further, between the folded portion of the sheet and the non-folded portion of the sheet, an interposing portion for interposing a thread rubber, and a pressure roller having a plurality of convex portions intermittently provided in the rotation direction and the rotation axis direction, At the supply angle position in the rotation direction, the sheet and the thread rubber are supplied to the pressure roller in a state where they are not joined to each other, and at the joint angle position in the rotation direction, the pressure roller, A plurality of joints that press-bond the folded portion and the non-folded portion to each other by using a crimping portion that is in contact with a crimping roller, wherein the plurality of joints regulate a position of the thread rubber in the expansion and contraction direction. And a joint forming part for forming a joint, wherein the plurality of protrusions have a first protrusion and a second protrusion adjacent to each other in the rotation direction, and the plurality of protrusions in the rotation direction. The angular difference between the supply angular position and the joining angular position is greater than the angular difference between the angular position at which the convex portion is provided and the angular position at which the second convex portion is provided in the rotational direction. An elastic sheet manufacturing apparatus characterized by being large.

  According to such a stretch sheet manufacturing apparatus, the folded portion can be fixed to the non-folded portion by the joint portion, and the position of the thread rubber can be regulated. Further, the thread rubber can enter the groove of the pressure roller before the thread rubber passes between the pressure roller and the pressure portion, and the upstream thread rubber can be easily guided to the groove. Therefore, cutting of the rubber thread at the time of forming the joint can be suppressed.

=== embodiment ===
<< Configuration of Elastic Sheet 10 >>
FIG. 1 is a plan view of an elastic sheet 10 manufactured by the manufacturing method (manufacturing apparatus) of the present embodiment. FIG. 1 is a view showing a state in which the elastic sheet 10 is stretched without wrinkles. FIG. 2A is a schematic sectional view of the elastic sheet 10 of FIG. 1, and FIG. 2B is a schematic sectional view of the elastic sheet 10 of a modification.

  The elastic sheet 10 has an elastic direction, a thickness direction, and a width direction orthogonal to each other. 2A includes a first sheet 11 and a second sheet 12, which are stacked in the thickness direction, a plurality of thread rubbers 14, and a plurality of joints j. The other end in the width direction of the first sheet 11 is folded back to one side in the width direction along the expansion and contraction direction, and covers a part of the second sheet 12. In the following description, the folded portion of the first sheet 11 is called a folded portion 11A, and the unfolded portion is called a non-folded portion 11B.

  The plurality of thread rubbers 14 are arranged between the first sheet 11 and the second sheet 12 at intervals in the width direction while being arranged along the direction in which the elastic sheet 10 expands and contracts. The thread rubber 14 is attached to the first sheet 11 and the second sheet 12 in an extended state. Therefore, the elastic sheet 10 is provided with elasticity in the direction along the rubber thread 14. As the thread rubber 14 (thread-like elastic member), various known synthetic rubbers such as styrene-based rubber, urethane-based rubber, ester-based rubber, polyurethane, and polyethylene can be applied in addition to thread-like natural rubber.

  The plurality of joints j are for pressing and joining a plurality of sheets to each other, and are intermittently arranged in the direction in which the elastic sheet 10 expands and contracts and in the width direction. Further, the plurality of joints j regulate the position of the thread rubber 14 in the expansion and contraction direction with respect to the first sheet 11 and the second sheet 12. As will be described later in detail, the position of the thread rubber 14 in the direction of expansion and contraction is regulated by a pair of joints jP formed on both sides of the thread rubber 14 in the width direction so as to form a pair. The planar shape of the joint j illustrated in FIG. 1 is rectangular, but the planar shape of the joint j is not particularly limited, and an arbitrary shape such as an ellipse, a circle, a parallelogram, or the like can be adopted.

  In the elastic sheet according to the present embodiment, at least a part of at least one sheet of the elastic sheet is folded along the elastic direction (longitudinal direction of the thread rubber 14). The thread rubber 14 may be interposed between the non-folded portion and the non-folded portion. In FIG. 2A, a part of the rubber thread 14a is interposed between the folded portion 11A and the non-folded portion 11B of the first sheet via the second sheet 12. In addition, as shown in FIG. 2B, a thread rubber 14 may be interposed between the folded portion 11A in which one sheet 11 is folded in half and the non-folded portion 11B. In the elastic sheet 10 shown in FIG. 2A, a part of the second sheet 12 may be folded back together with the first sheet 11. In addition, a stretchable sheet in which another single or a plurality of sheets are laminated on the stretchable sheet 10 illustrated in FIGS. 2A and 2B may be used.

<< Example of use of elastic sheet 10 >>
FIG. 3A is a schematic perspective view of the pants-type disposable diaper 1 using the elastic sheet 10. FIG. 3B is a schematic plan view of the pants-type disposable diaper 1 in the unfolded state and the stretched state as viewed from the skin side. The elastic sheet 10 manufactured by the manufacturing method (manufacturing apparatus) of the present embodiment is used as a component of an absorbent article such as a disposable diaper.

  The illustrated pants-type disposable diaper 1 (hereinafter also referred to as “diaper”) includes an absorbent main body 2 that absorbs and retains excrement, an abdominal waist portion 3 applied to a wearer's abdomen, and a back of the wearer. And a back side waist portion 4 applied to the portion. As shown in the unfolded state of FIG. 3B, the central portion in the left-right direction of the abdominal waistline portion 3 overlaps one end in the longitudinal direction of the absorbent main body 2, and the other end in the longitudinal direction of the absorbent main body 2 is provided. The center part of the back waist part 4 in the left-right direction overlaps the end part. The unfolded diaper 1 is folded in two substantially at the center in the longitudinal direction, and the left and right sides of the abdominal waistline portion 3 and the left and right sides of the back waistline portion 4 are joined by welding or the like. The diaper 1 is of a pants type.

  The abdominal waist portion 3 and the back waist portion 4 are substantially rectangular members in plan view, and a plurality of thread rubbers 5 that expand and contract in the left-right direction of the diaper 1 are arranged at intervals in the up-down direction. . Therefore, the abdominal waist part 3 and the back waist part 4 can expand and contract in the left-right direction of the diaper 1 and fit around the wearer's waist. The stretchable sheet 10 can be used for the abdominal waistline 3 and the back waistline 4. The stretching direction of the elastic sheet 10 corresponds to the left-right direction of the diaper 1, and the width direction of the elastic sheet 10 corresponds to the up-down direction of the diaper 1.

  When the elastic sheet 10 is used as a component of an absorbent article, a soft sheet member can be exemplified as a sheet constituting the elastic sheet 10. For example, it is a nonwoven fabric such as a spunbonded nonwoven fabric and an SMS (spunbond / meltblown / spunbond) nonwoven fabric. Further, the sheet interposed between the sheets may be a stretchable sheet (a stretchable film or a stretchable nonwoven fabric) that can stretch in the stretch direction of the stretchable sheet 10. In addition, not only the sheet interposed between the sheets but also at least one of the sheet located on the most non-skin side and the sheet located on the most skin side may be an elastic film or an elastic nonwoven fabric.

  Further, the elastic sheet 10 is not limited to being used for the abdominal waistline 3 and the back waistline 4. For example, the elastic sheet 10 can be used in leg gather portions provided on both sides of the absorbent body in the left-right direction of the diaper so that the disposable diaper fits around the wearer's leg. Since the leg gathers extend and contract in the longitudinal direction of the absorbent main body, the longitudinal direction of the absorbent main body corresponds to the extension and contraction direction of the elastic sheet 10.

  Further, in a tape-type disposable diaper (not shown), a fastening tape (hook member) extends from the back waist portion to both outer sides in the left-right direction. The elastic sheet 10 can be used for a side panel for attaching the fastening tape to the back waistline. Since the side panel expands and contracts in the left-right direction of the diaper, the left-right direction of the diaper corresponds to the expansion and contraction direction of the elastic sheet 10.

  The elastic sheet 10 is not limited to pants-type or tape-type disposable diapers, but can also be used as a component of absorbent articles such as pad-type disposable diapers, sanitary napkins, and sanitary shorts-type napkins. is there. In addition, it can be used not only for absorbent articles but also for masks, cleaning sheets, and the like.

=== Stretching Sheet Manufacturing Apparatus and Method ===
<< 1st Embodiment >>
(Structure of elastic sheet manufacturing apparatus 20)
FIG. 4 is a schematic sectional view of the stretch sheet manufacturing apparatus 20 according to the first embodiment. FIG. 5A is an explanatory diagram of the surfaces of the anvil roller 25 and the horn roller 26. FIG. 5B is a schematic enlarged view of the closest part between the anvil roller 25 and the horn roller 26. 6A and 6B are explanatory diagrams of a method of attaching the thread rubber 14 by the joint j. FIG. 7A is a schematic view of the stretchable sheet manufacturing apparatus 20 as viewed from above, and FIG. 7B is an explanatory view of a process in the folding member 23. Hereinafter, the manufacturing apparatus 20 of the elastic sheet 10 shown in FIG. 2A will be described as an example.

  The stretch sheet manufacturing apparatus 20 includes a transport roller group 21, an ultrasonic welding device 22, a folding member 23, and a discharge roller 24. The elastic sheet 10 is manufactured as a continuous sheet that is continuous in the expansion and contraction direction. In the elastic sheet manufacturing apparatus 20, a direction in which the materials are continuous is defined as a transport direction, and a direction perpendicular to the transport direction (ie, the width direction of the elastic sheet 10 and the materials) is defined as a CD direction.

  The transport roller group 21 is disposed upstream of the ultrasonic welding device 22 in the transport direction, and transports the material forming the elastic sheet 10 and supplies it to the ultrasonic welding device 22. Specifically, the transport roller group 21 includes a first transport roller 211 that transports a continuous body of the first sheet 11, a second transport roller 212 that transports a continuous body of the second sheet 12, and a continuous A third transport roller 213 that transports a plurality of bodies.

  The first to third transport rollers 211 to 213 are rotated around a rotation axis along the CD direction by a drive source (for example, a motor) not shown. The first to third transport rollers 211 to 213 may be a pair of rollers or a single roller. Further, the material may be supplied to the ultrasonic welding device 22 by a belt conveyor or the like.

  Hereinafter, the continuum of the first sheet 11, the continuum of the second sheet 12, the continuity of the thread rubber 14, and the continuation of the elastic sheet 10 are simply referred to as the first sheet 11, the second sheet 12, the thread rubber 14, Also referred to as an elastic sheet 10.

  The ultrasonic welding device 22 is for forming a joint j of the stretchable sheet 10, and is provided with an anvil roller 25 (a pressure roller) opposed to the horn roller 26 (a pressure member) which is in contact with the anvil roller 25. ). The anvil roller 25 and the horn roller 26 rotate around a rotation axis along the CD direction by a drive source (not shown). Note that the anvil roller 25 and the horn roller 26 need only be capable of contacting via at least a material passing therethrough, and are preferably capable of contacting with no material.

  As shown in FIG. 5A, a plurality of convex portions 251 are formed on the outer peripheral surface of the anvil roller 25. The projections 251 together with the horn roller 26 ultrasonically weld a material to form a joint j. Therefore, the protrusions 251 are arranged corresponding to the arrangement pattern of the joints j in the elastic sheet 10.

  The outer peripheral surface of the horn roller 26 is a smooth surface having no irregularities, and vibrates in a direction in which the distance between the horn roller 26 and the outer peripheral surface of the anvil roller 25 is increased or reduced (that is, the thickness direction of the material passing therethrough). The frequency of the vibration is, for example, a predetermined value of 20 kHz to 40 kHz, and the amplitude is, for example, a predetermined value of 20 μm to 60 μm. Therefore, the surface of the horn roller 26 vibrates ultrasonically. Such vibration is generated by inputting an electric signal of the above-described frequency to a piezo element of a converter (not shown) connected to the horn roller 26.

  Further, the first sheet 11, the second sheet 12, and the rubber thread 14 pass between the anvil roller 25 and the horn roller 26 after being wound around the anvil roller 25. The peripheral speed values of the first and second transport rollers 211 and 212 for transporting the first and second sheets 11 and 12 are substantially the same as the peripheral speed value of the anvil roller 25, respectively. Therefore, the first and second sheets 11 and 12 are wound around the anvil roller 25 in a state where the first and second sheets 11 and 12 are stretched to such a degree that they are not substantially stretched and are not loosened.

  On the other hand, the peripheral speed value of the third transport roller 213 that transports the thread rubber 14 is about one-half the extension speed of the peripheral speed value of the anvil roller 25. The extension ratio is a ratio R (R = E1 / E0) indicating how many times the total length E1 of the thread rubber 14 in the stretched stretchable sheet 10 is extended to the total length E0 in the unloaded state, which is a natural length. . Therefore, the thread rubber 14 is stretched to the above-described stretching magnification while passing between the third transport roller 213 and the anvil roller 25, and is wound around the anvil roller 25 in the stretched state.

  The folding member 23 is a member for folding the end of the first sheet 11 in the CD direction along the transport direction, and as shown in FIG. 7B, the upstream supporting portion 231, the downstream supporting portion 232, A part 233. The upstream support portion 231 is a portion that supports the first sheet 11 conveyed in the horizontal direction. The downstream support portion 232 changes the transport direction of the first sheet 11 in a direction inclined with respect to the up-down direction (a supply direction to the anvil roller 25), and the first sheet 11 and the second sheet joined thereto. 12 and a portion that supports the rubber thread 14. The bent portion 233 is a portion that is folded so as to overlap the non-folded portion 11B while raising the end of the first sheet 11 in the CD direction, thereby forming a folded portion 11A.

  The discharge roller 24 is a roller that discharges the manufactured elastic sheet 10 to a downstream process. The discharge roller 24 is rotated around a rotation axis along the CD direction by a drive source (not shown).

(Manufacturing method of elastic sheet 10)
In the method for manufacturing the elastic sheet 10 by the manufacturing apparatus 20 having the above configuration, first, the first transport roller 211 supplies the first sheet 11 to the folding member 23. As shown in FIGS. 7A and 7B, a part of the first sheet 11 is folded in the CD direction using the folding member 23 (intervening part) to form a folded part 11A. On the other hand, the second transport roller 212 and the third transport roller 213 (intervening portion) join the second sheet 12 and the plurality of thread rubbers 14 to the first sheet 11 supported by the downstream support portion 232 of the folding member 23. Let it.

  Specifically, (a part of) the second sheet 12 is interposed between the folded portion 11A and the non-folded portion 11B of the first sheet. A plurality of thread rubbers 14 are interposed between the non-folded portion 11B of the first sheet and the second sheet 12. Part of the rubber thread 14a is interposed between the folded portion 11A and the non-folded portion 11B of the first sheet via the second sheet 12.

  Thus, a laminated body 100 in which all the sheets constituting the elastic sheet 10 are laminated with the thread rubber 14 interposed therebetween is formed. Then, as illustrated in FIG. 4, the stacked body 100 is supplied to the anvil roller 25 by the transport roller group 21 (supply unit) at the supply angle position P1 in the rotation direction of the anvil roller 25. In the laminated body 100, the folded portion 11A of the first sheet, the non-folded portion 11B, the second sheet 12, and the rubber thread 14 are not joined to each other. Specifically, the adhesive is not applied to the first and second sheets 11 and 12 and the thread rubber 14, and the first and second sheets 11 and 12 are in a state where they are not pressed against each other.

  Thereafter, the anvil roller 25 rotates while winding the laminate 100 around the outer peripheral surface, and supplies the laminate 100 between the anvil roller 25 and the horn roller 26. Then, at the joining angle position P2 in the rotation direction of the anvil roller 25, the ultrasonic welding device 22 (joining portion forming portion) ultrasonically couples the folded portion 11A, the non-folded portion 11B, and the second sheet 12 of the first sheet 11 with each other. A plurality of joints j are formed by welding (compression bonding) and joining each other. Thus, the elastic sheet 10 is manufactured.

  Specifically, when the first and second sheets 11 and 12 and the thread rubber 14 pass between the anvil roller 25 and the horn roller 26, the first and second sheets 11 and 12 At a position corresponding to the portion 251, it is melted by ultrasonic vibration from the horn roller 26 and joined. At this time, the thread rubber 14 is located in the groove 252 (see FIGS. 5A and 5B) between the convex portions 251 adjacent in the CD direction on the outer peripheral surface of the anvil roller 25, and is not ultrasonically welded.

  In FIG. 4, the thread rubber 14 is located on the convex portion 251 of the anvil roller 25 for easy understanding of the drawing. However, the thread rubber 14 is actually located in the groove 252. The same applies to similar drawings described later.

  Further, as shown in FIG. 2A, in the non-folded portion 11B of the first sheet, in a region overlapping with the folded portion 11A, the folded portion 11A of the first sheet, the non-folded portion 11B, and the second sheet 12 are joined to each other at the joint j. Joined by. In other regions, the non-folded portion 11B of the first sheet and the second sheet 12 are joined by the joint j.

  Further, as described above, the plurality of joints j serve to regulate the position of the rubber thread 14 in the expansion and contraction direction with respect to the first sheet 11 and the second sheet 12, that is, the first and second sheets 11. , 12 also serves to attach the thread rubber 14.

  For this purpose, in the present embodiment, as shown in FIG. 6A, in the CD direction, the interval Dj between the joining portion pair jP located on both sides of the thread rubber 14 is set to the value of the thread rubber 14 extending at the time of forming the joining portion j. It is assumed that the dimension D14 in the CD direction is equal to or larger than the dimension D14. Further, it is assumed that the interval Dj is smaller than the size of the thread rubber 14 in the CD direction in the naturally long unloaded state. The stretched rubber thread 14 is thinner than the natural thread rubber 14 by the length of the stretched rubber thread. Therefore, when the stretched state of the thread rubber 14 is relaxed by cutting the continuum of the thread rubber 14 after the formation of the joint j, as shown in FIG. The thread rubber 14 to be expanded in the direction can be pressed by the joint portion pair jP from the CD direction. As a result, the position of the thread rubber 14 in the direction of expansion and contraction is regulated, and the thread rubber 14 is attached to the sheet.

  In addition, the interval Dj between the joint portion pair jP may be smaller than the CD-direction size D14 of the thread rubber 14 extending at the time of forming the joint portion j. That is, the joint j may be formed while the thread rubber 14 is compressed by the space surrounded by the groove 252 of the anvil roller 25 and the horn roller 26. Further, a part of the thread rubber 14 may be pressed together with the first and second sheets 11 and 12 by the horn roller 26 and the convex portion 251 of the anvil roller 25. In these cases, when the joint j is formed (that is, before the stretched state of the thread rubber 14 is relaxed), the position of the thread rubber 14 in the expansion and contraction direction is regulated, and the thread rubber 14 is attached to the sheet. State.

  Further, the pressure roller and the pressure portion forming the joint j are not limited to the ultrasonic welding device 22 and may be any device that can press and bond a plurality of sheets to each other. For example, the joint j (heat-welded portion) may be formed using a heat sealing device. The heat sealing device is a pair of heated rollers, one roller is a roller having a convex portion corresponding to the joint j on the outer peripheral surface, and the other roller is a roller having the convex portion having a smooth outer peripheral surface. Can be exemplified as a roller which is received by the roller.

  As described above, in the manufacturing method of the present embodiment, the first sheet 11 and the thread rubber 14 are attached to the anvil roller 14 with the thread rubber 14 interposed between the folded portion 11A and the non-folded portion 11B of the first sheet. 25 to form a joint j. By doing so, the folded portion 11A of the first sheet can be fixed to the non-folded portion 11B and the thread rubber 14 can be attached to the folded portion 11A and the non-folded portion 11B of the first sheet.

  In the elastic sheet 10 in which a part of the sheet is folded, a folded end 11C is formed as shown in FIG. 2A and the like. Therefore, when the elastic sheet 10 is used for an absorbent article or the like, the curved folded end 11C can be brought into contact with the wearer's skin instead of the cut end of the sheet. Therefore, it is possible to prevent the skin of the wearer from being damaged.

  Further, in the elastic sheet 10 of the present embodiment, as shown in FIG. 1, the joints j are located on both sides of the thread rubber 14 in the width direction, and the joints j are formed intermittently in the elastic direction. By arranging the joints j at intervals in the expansion and contraction direction, the area of the joints j having high rigidity can be reduced, and the rigidity of the elastic sheet 10 can be suppressed.

  Therefore, on the outer peripheral surface of the anvil roller 25, a plurality of convex portions 251 are provided intermittently in the rotation direction (transport direction) and the rotation axis direction (CD direction). In the plurality of protrusions 251 arranged in the rotation direction of the anvil roller 25, the protrusions adjacent in the rotation direction are referred to as a first protrusion 251a and a second protrusion 251b.

  Then, in the manufacturing method of the present embodiment, as shown in FIG. 4, in the rotation direction of the anvil roller 25, the angular position P3 where the first convex portion 251a is provided and the second convex portion 251b are provided. It is assumed that the angle difference θ1 between the supply angle position P1 and the joining angle position P2 of the multilayer body 100 is larger than the angle difference θ2 from the angle position P4 (θ2 <θ1).

  By doing so, the angle difference θ1 between the supply angle position P1 and the joining angle position P2 becomes larger than zero, and the laminated body 100 is supplied to the ultrasonic welding device 22 before the outer peripheral surface of the anvil roller 25 ( (Curved surface).

  Therefore, even if the thread rubber 14 is supplied on the projection 251 of the anvil roller 25, the thread rubber 14 may roll on the surface of the anvil roller 25 in the CD direction before being supplied to the ultrasonic welding device 22. Thus, it can enter the groove 252. Then, the state in which the thread rubber 14 enters the groove 252 is maintained, and the thread rubber 14 is stably conveyed. Accordingly, it is possible to prevent the rubber thread 14 from being cut on the horn roller 26 while being positioned on the protrusion 251. The first and second sheets 11 and 12 are also stably conveyed to the ultrasonic welding device 22 by being wound around the outer peripheral surface of the anvil roller 25.

  However, on the outer peripheral surface of the anvil roller 25, the protrusions 251 are intermittently arranged in the rotation direction. Therefore, if the amount of the thread rubber 14 wound around the anvil roller 25 before being supplied to the ultrasonic welding device 22 is small (when the angle difference θ2> θ1), the space between the convex portions 251 adjacent in the rotation direction ( The thread rubber 14 may be supplied to the area A) in FIG. 5A. In this case, the protrusions 251 do not exist on both sides of the thread rubber 14 in the CD direction, and it is difficult to determine the position of the thread rubber 14 in the CD direction. Therefore, the thread rubber 14 on the upstream side is less likely to be guided to the groove 252, and the thread rubber 14 supplied on the convex part 251 is easily supplied to the ultrasonic welding device 22 as it is. Then, the thread rubber 14 is cut.

  On the other hand, in the present embodiment, the supply of the stacked body 100 is larger than the angle difference θ2 between the angular positions P3 and P4 at which the first protrusion 251a and the second protrusion 251b adjacent in the rotation direction are provided. The angle difference θ1 between the angle position P1 and the joining angle position P2 is larger. Therefore, the thread rubber 14 can pass between the protrusions 251 arranged in the rotation axis direction before being supplied to the ultrasonic welding device 22 after being supplied to the anvil roller 25 (can enter the groove 252). ), The upstream rubber thread 14 is also easily guided to the groove 252. Therefore, even if the rubber thread 14 is supplied on the convex part 251, it can enter the groove part 252 before being supplied to the ultrasonic welding device 22, and the cutting of the rubber thread 14 can be suppressed.

  Note that, in the cross section orthogonal to the CD direction of the manufacturing apparatus 20, the angle difference θ1 is a virtual line connecting the rotation center of the anvil roller 25 and the point at which the laminate 100 starts to contact the anvil roller 25, It can also be said to be an angle θ1 formed by the rotation center and an imaginary line connecting the contact point between the anvil roller 25 and the horn roller 26.

  Similarly, the angle difference θ2 is defined by the imaginary line connecting the rotation center of the anvil roller 25, the center of the first protrusion 251a, and the rotation center of the anvil roller 25 in a cross section orthogonal to the CD direction of the manufacturing apparatus 20. , And an imaginary line connecting the center of the second convex portion 251b. Further, the first protrusion 251a and the second protrusion 252b are formed as protrusions 251 forming a joint j that regulates the position of the same thread rubber 14, that is, protrusions having substantially the same position in the CD direction. 251.

  In the present embodiment, the convex portions 251 are arranged at equal intervals in the rotation direction, but the present invention is not limited to this. When the interval between the convex portions 251 adjacent to each other in the rotation direction is not constant, it is sufficient that θ1 is larger than the angular difference θ2 between the angular positions at which the convex portions 251 having the minimum interval are provided, and more preferably the maximum. It is preferable that the angle θ1 is larger than the angle difference θ2 between the angular positions at which the convex portions 251 having the intervals of are provided.

  Also, as in the elastic sheet 10 shown in FIG. 1, when the length L1 of the folded portion 11A of the first sheet in the width direction (predetermined direction) is shorter than the length L2 of the non-folded portion 11B (L1 <L2). In the step of supplying the laminate 100 to the anvil roller 25, it is preferable to supply the laminate 100 such that the non-folded portion 11B is located closer to the anvil roller 25 than the folded portion 11A.

  By directly winding the non-folded portion 11B long in the width direction (CD direction) around the anvil roller 25 and transporting the same, the laminate 100 is transported more stably. Therefore, it is possible to suppress the sheet from being twisted due to a positional shift between the folded portion 11A and the non-folded portion 11B in the transport direction. In addition, the first sheet is conveyed in a state where the folded end 11C (fold) is kept clean, and the joint j is formed. Therefore, the elastic sheet 10 in which the sheet is folded without being twisted can be manufactured.

  Further, in the step of interposing the thread rubber 14 between the folded portion 11A and the non-folded portion 11B of the first sheet, as shown in FIG. 7B, the first rubber is formed on the downstream support portion 232 (downstream side portion) of the folding member 23. It is preferable that the thread rubber 14 join the first sheet 11 along the transport direction of the one sheet 11. That is, it is preferable that the thread rubber 14 is joined to the first sheet 11 along the supply direction of the first sheet 11 to the anvil roller 25.

  By doing so, the upstream support portion 231 and the downstream support portion 232 are bent and arranged like the folding member 23 of the present embodiment, and even when the folding member 23 has the corner Is supplied to the anvil roller 25 without contacting the corner 234 of the folding member 23. Therefore, the movement of the thread rubber 14 can be suppressed from being restricted by the folding member 23, and the thread rubber 14 moves in the CD direction from when it is fed out from the third transport roller 213 to when it is supplied to the anvil roller 25. Can do it (can wander). Therefore, even if the rubber thread 14 is supplied on the convex part 251, the thread rubber 14 can enter the groove part 252, and it is possible to suppress the rubber thread 14 from being cut when the joint j is formed.

  Further, in the present embodiment, in order to manufacture the elastic sheet 10 illustrated in FIG. 2A, the non-folded portion 11B of the first sheet and the second sheet 12 ( The laminated body 100 in which the folded portion 11A of the first sheet is overlapped on one side in the thickness direction of the second sheet 12 with the thread rubber 14 interposed between the second sheet and the second sheet) is supplied to the anvil roller 25. I do.

  Therefore, compared to a case where the first sheet 11, the second sheet 12, and the rubber thread 14 are individually supplied to the anvil roller 25 and wound, the positional deviation of each sheet and the rubber thread 14 in the CD direction can be suppressed. Also, unlike the manufacturing method of the present embodiment, for example, bonding is performed by the ultrasonic welding device 22 in a state where the thread rubber 14 is interposed between the first sheet 11 and the second sheet 12 that are not partly folded. After forming the portion j, the manufacturing process and the manufacturing apparatus of the stretchable sheet 10 are simplified as compared with a case where a part of the first sheet 11 is folded and the folded portion 11A is bonded to the second sheet 12 with an adhesive. it can. Further, as described above, a joint (ultrasonic welding part) for attaching the thread rubber 14 to the first and second sheets 11 and 12 and a joint (adhesive) for fastening the folded part 11A of the first sheet to the second sheet 12 In the elastic sheet 10 according to the manufacturing method of the present embodiment, the number of the joints j can be reduced, and the rigidity of the elastic sheet 10 can be suppressed from being higher than in the case where the above is different. Therefore, the flexibility of the elastic sheet 10 can be ensured, and a decrease in the contraction performance of the thread rubber 14 can be suppressed.

  In addition, not only the elastic sheet 10 shown in FIG. 2A but also in the case where the elastic sheet 10 is composed of three or more sheets, a laminate in which all the sheets of the elastic sheet 10 and the thread rubber 14 are laminated Preferably, 100 is supplied to the anvil roller 25. By doing so, all the sheets of the elastic sheet 10 can be joined by the joint j. Therefore, the manufacturing process and the manufacturing apparatus of the elastic sheet 10 can be simplified, and the rigidity of the elastic sheet 10 can be suppressed, as compared with the case where the bonding portion of the sheet is different for each layer.

  Further, compared to the case where the sheet and the thread rubber 14 of the elastic sheet 10 are individually supplied to the anvil roller 25 and wound, it is better to supply the laminate 100 in the CD direction of each sheet and the thread rubber 14. Is less likely to shift.

  Further, the thread rubber 14 and a sheet (here, the non-folded portion 11B of the first sheet) located closer to the anvil roller 25 than the thread rubber 14 are supplied to the anvil roller 25 at the same timing. Therefore, compared to the case where the sheet disposed on the anvil roller 25 side is wound around the anvil roller 25 first, the sheet is more likely to bend into the groove 252 together with the thread rubber 14, and the thread rubber 14 is more likely to enter the groove 252. . Therefore, it is possible to prevent the thread rubber 14 from being cut when the joint j is formed.

  Further, in the elastic sheet 10, as shown in FIG. 2A and the like, it is preferable that the thread rubber 14 is not disposed at the folded end 11C of the sheet. By doing so, the joints j can be formed on both sides in the CD direction of the thread rubber 14 closest to the folded end 11C, and the position of the thread rubber 14 can be regulated firmly. Further, since the thread rubber 14 is arranged at an interval in the CD direction from the folded end 11C, the thread rubber 14 can move in the CD direction on the anvil roller 25, and the thread rubber 14 easily enters the groove 252. . Further, since the thread rubber 14 is not located at the folded end 11C, the folded end 11C can be softened, and when the shrinkable sheet 10 is used for an absorbent article or the like, the wearer's skin may be damaged. Can be suppressed.

  Also, as in the elastic sheet 10 shown in FIG. 1, the length L1 of the folded portion 11A of the first sheet folded to one side in the width direction is shorter than the length L2 of the non-folded portion 11B (L1 <L2) In the step of forming the joining portion j, the second joining portion j2 that presses the folded portion 11A and the non-folded portion 11B and joins the folded portion 11A and the non-folded portion 11B, and the folded portion 11A in the width direction (CD direction). It is preferable to form a second joint j2 that is arranged to straddle one end 11Aa. By doing so, the end portion of the folded portion 11A can be firmly joined to the non-folded portion 11B and the second sheet 12 without being turned up. Therefore, peeling of the folded portion 11A can be suppressed.

  The second joint j2 is preferably different from the joint j arranged on both sides of the thread rubber 14 (that is, the joint j that regulates the position of the thread rubber 14). By doing so, even when the second joint j2 is peeled off, the state in which the thread rubber 14 is attached to the sheets 11 and 12 by the joint j is maintained. Therefore, the contraction performance of the elastic sheet 10 (the thread rubber 14) can be maintained.

  Hereinafter, a second embodiment and a third embodiment will be described. In the second embodiment and the third embodiment, parts different from the first embodiment will be mainly described.

<< 2nd Embodiment >>
FIG. 8 is a schematic sectional view of an elastic sheet manufacturing apparatus 20 according to the second embodiment. The manufacturing apparatus 20 according to the second embodiment has a press roller 28.

  The press roller 28 is a roller that is disposed so as to be in contact with the anvil roller 25 on the upstream side of the horn roller 26 in the transport direction. The press roller 28 is rotated around a rotation axis along the CD direction by a drive source (not shown). Note that the anvil roller 25 and the press roller 28 may be in contact with each other at least through a material passing therethrough, and preferably may be contactable without any material.

  The manufacturing method using the manufacturing apparatus 20 of the second embodiment uses the anvil roller 25 and the press roller 28 at the pressing angle position P5 on the upstream side of the joining angle position P2 in the rotation direction of the anvil roller 25. There is a step of pressing the folded portion 11A, the non-folded portion 11B, and the second sheet 12 of one sheet.

  Specifically, the outer peripheral surface of the press roller 28 is a smooth surface having no irregularities, and the press roller 28 contacts the convex portion 251 of the anvil roller 25. Therefore, the folded portion 11A, the non-folded portion 11B, and the second sheet 12 of the first sheet are pressed by the press roller 28 at a position corresponding to the convex portion 251 of the anvil roller 25. As a result, the sheets 11A, 11B, 12 and the thread rubber 14 can be firmly wound around the anvil roller 25, and their respective positions in the CD direction are fixed and conveyed stably.

  When the manufacturing apparatus 20 has the press roller 28 as described above, the angle difference θ2 between the angular positions P3 and P4 at which the first protrusion 251a and the second protrusion 251b adjacent to each other in the rotation direction of the anvil roller 25 are provided. It is preferable that the angle difference θ3 between the supply angle position P1 and the pressing angle position P5 is larger than that (θ2 <θ3).

  By doing so, the thread rubber 14 can pass between the convex portions 251 arranged in the direction of the rotation axis between the time when the rubber thread 14 is supplied to the anvil roller 25 and the time when the rubber thread 14 passes through the press roller 25. The thread rubber 14 on the upstream side is also easily guided to the groove 252. Thereafter, the state where the thread rubber 14 has entered the groove 252 is fixed by the press roller 28, and the thread rubber 14 is stably transported to the ultrasonic welding device 22. Therefore, it is possible to prevent the thread rubber 14 from being cut when the joint j is formed.

  Further, it is preferable that the folded end 11 </ b> C of the first sheet passes between the anvil roller 25 and the press roller 28 and is pressed by the anvil roller 25 and the press roller 28. By doing so, the joint j is formed by being conveyed to the ultrasonic welding device 20 with the folded end 11C (fold) kept clean. Therefore, the elastic sheet 10 in which the sheet is folded without being twisted can be manufactured.

<<< 3rd Embodiment >>>
FIG. 9 is a schematic sectional view of a stretch sheet manufacturing apparatus 20 according to the third embodiment. The third embodiment differs from the first embodiment in the ultrasonic welding device 22. The ultrasonic welding device 22 is not limited to a pair of rollers. For example, as shown in FIG. 9, instead of the horn roller 26, a non-rotating horn 27 having a flat vibrating surface 27a disposed opposite to the surface of the anvil roller 25 may be used. The vibrating surface 27a of the horn 27 vibrates in a direction to expand and contract the space between the horn 27 and the surface of the anvil roller 25, and a joint j is formed.
Further, although not shown, the outer peripheral surface of the horn roller 26 may be an uneven surface that meshes with the unevenness of the anvil roller 25.

  As described above, the embodiments of the present invention have been described. However, the above embodiments are for the purpose of facilitating the understanding of the present invention, and are not intended to limit and interpret the present invention. Further, the present invention can be changed or improved without departing from the gist thereof, and it goes without saying that the present invention includes equivalents thereof.

1 pants-type disposable diapers,
2 Absorbent body, 3 belly waist, 4 back waist, 5 thread rubber,
10 elastic sheets, 100 laminates,
11 1st sheet (sheet),
11A folded part, 11B non-folded part, 11C folded end,
12 second sheet (second sheet), 14 thread rubber,
20 Stretch sheet manufacturing equipment,
21 transport roller group (supply unit, interposition unit),
22 ultrasonic welding equipment (joining part forming part),
23 folding member (intervening part), 24 discharge roller,
25 anvil roller (pressure roller),
251 convex portion, 251a first convex portion, 251b second convex portion,
252 groove,
26 Horn roller (crimping part),
27 horn (crimping part), 28 press roller,
j junction, jP junction pair,
j2 a second joint;

Claims (9)

A step of interposing thread rubber between the folded portion of the sheet and the non-folded portion of the sheet,
At a supply angle position in the rotation direction of the pressure roller provided with a plurality of protrusions intermittently in the rotation direction and the rotation axis direction, the sheet and the thread rubber are not bonded to each other, and the pressure roller is Supplying to the
At the joining angle position in the rotation direction, a plurality of joints that press-bond the folded portion and the non-folded portion to each other by using the pressure roller and the pressure portion that contacts the pressure roller, Forming the plurality of joints that regulate the position of the thread rubber in the direction of expansion and contraction,
The plurality of protrusions include a first protrusion and a second protrusion adjacent to each other in the rotation direction,
The supply angle position and the joint angle position are smaller than the angle difference between the angle position where the first protrusion is provided in the rotation direction and the angle position where the second protrusion is provided in the rotation direction. The method for manufacturing a stretchable sheet, wherein the angle difference between the sheet and the sheet is larger. It is a manufacturing method of the elastic sheet of Claim 1, Comprising:
A part of the sheet is folded in a predetermined direction to form the folded part,
In the predetermined direction, the length of the folded portion is shorter than the length of the non-folded portion,
The method of manufacturing a stretchable sheet according to claim 1, wherein, in the supplying step, the sheet is supplied such that the non-folded portion is positioned closer to the pressure roller than the folded portion. It is a manufacturing method of the elastic sheet according to claim 1 or 2,
Using a folding member, a part of the sheet is folded in a predetermined direction to form the folded portion,
A method for manufacturing a stretchable sheet, comprising joining the thread rubber to the sheet along a sheet conveying direction at a downstream side of the folding member. It is a manufacturing method of the elastic sheet according to any one of claims 1 to 3,
The thread rubber is interposed between the non-folded portion and a second sheet overlapping one side in the thickness direction of the non-folded portion, and the one side in the thickness direction of the second sheet is interposed. A method for producing a stretchable sheet, comprising supplying a laminate obtained by stacking the folded portions to the pressure roller. It is a manufacturing method of the elastic sheet according to any one of claims 1 to 4,
A method for producing a stretchable sheet, comprising supplying a laminate obtained by laminating all the other sheets of the stretchable sheet and the sheet to the pressure roller. It is a manufacturing method of the elastic sheet according to any one of claims 1 to 5,
A step of pressing the folded portion and the non-folded portion using a pressure roller and a press roller that contacts the pressure roller at a pressing angle position upstream of the joining angle position in the rotation direction. Has,
The supply angular position and the pressing angular position are smaller than the angular difference between the angular position where the first convex portion is provided in the rotational direction and the angular position where the second convex portion is provided in the rotational direction. The method for manufacturing a stretchable sheet, wherein the angle difference between the sheet and the sheet is larger. It is a manufacturing method of the elastic sheet of Claim 6, Comprising:
The method of manufacturing a stretchable sheet, wherein the pressing includes pressing the folded end of the sheet using the pressure roller and the press roller. It is a manufacturing method of the elastic sheet according to any one of claims 1 to 7,
A part of the sheet is folded back to one side in a predetermined direction to form the folded portion,
In the predetermined direction, the length of the folded portion is shorter than the length of the non-folded portion,
In the step of forming the joining portion, a second joining portion that presses and joins the folded portion and the non-folded portion to each other, and straddles the one-side end of the folded portion in the predetermined direction. A method for manufacturing a stretchable sheet, comprising forming the second joint portion to be arranged. A folded portion of the sheet, between the non-folded portion of the sheet, an interposed portion for interposing a thread rubber,
At a supply angle position in the rotation direction of the pressure roller provided with a plurality of protrusions intermittently in a rotation direction and a rotation axis direction, the sheet and the thread rubber are not bonded to each other, and the pressure roller is A supply unit for supplying
At the joining angle position in the rotation direction, a plurality of joints that press-bond the folded portion and the non-folded portion to each other by using the pressure roller and the pressure portion that contacts the pressure roller, A joining portion forming portion that forms the plurality of joining portions that regulates the position of the thread rubber in the expansion and contraction direction,
The plurality of protrusions include a first protrusion and a second protrusion adjacent to each other in the rotation direction,
The supply angle position and the joining angle position are smaller than the angle difference between the angle position where the first protrusion is provided in the rotation direction and the angle position where the second protrusion is provided in the rotation direction. An apparatus for manufacturing a stretchable sheet, wherein the angle difference between the sheet and the sheet is larger.

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