JP2014014449A - Method and apparatus for manufacturing composite of continuous sheet related to absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit necking caused in a first continuous sheet in a manufacturing process in manufacturing a composite of a continuous sheet.SOLUTION: In this method for manufacturing a composite of a continuous sheet, an elastic slip-like sheet is cut from a first continuous sheet which exhibits elasticity in the continuous direction by elongation in the continuous direction to generate a slip-like sheet, and the slip-like sheet is joined in a superposition on a second continuous sheet to manufacture a composite of the continuous sheet. While the first continuous sheet is wrapped in the shape of S round an upstream roll and a downstream roll rotating with the outer peripheral surfaces thereof opposite to each other along the continuous direction of the first continuous sheet, a difference in peripheral velocity value is made between the upstream roll and the downstream roll, whereby the first continuous sheet is elongated in the continuous direction at a predetermined magnification to exhibit elasticity in the first continuous sheet, the first continuous sheet where the elasticity is exhibited is cut in the elongated state to generate an elongated slip-like sheet, and the generated elongated slip-like sheet is jointed to the second continuous sheet.

Description

  The present invention provides a continuous sheet composite according to an absorbent article by generating a stretchable sheet-like sheet according to an absorbent article such as a disposable diaper from the first continuous sheet and joining the second continuous sheet. The present invention relates to a manufacturing method and an apparatus.

  Conventionally, a composite sheet formed by joining a plurality of sheets is used for a disposable diaper as an example of an absorbent article. For example, a composite sheet obtained by joining a stretchable sheet such as a film to a non-stretchable sheet such as a nonwoven fabric under stretch is used as a stretchable composite sheet as a packaging material for diapers. And recently, as the latter stretchable sheet, a sheet that exhibits stretchability in the same direction by being stretched in a predetermined direction at a predetermined magnification may be used (Patent Document 1).

JP 2010-240112 A

  Such a composite sheet is manufactured, for example, in the following manner in a disposable diaper manufacturing line. FIG. 1 is a schematic side view for explanation.

  First, the 1st continuous sheet 3a is drawn out from the raw fabric of the elastic sheet which has not developed the elasticity. Then, the sheet 3 a is wound around the upstream roll 21 and the downstream roll 23, and the sheet 3 a is conveyed by the rolls 21 and 23. Here, the peripheral speed value V <b> 23 of the downstream roll 23 is set to be larger than the peripheral speed value V <b> 21 of the upstream roll 21. Therefore, during the conveyance, the first continuous sheet 3a is stretched between the rolls 21 and 23 at a predetermined magnification in the conveyance direction, and the sheet 3a exhibits elasticity.

  If it does so, the 1st continuous sheet 3a sent out from the downstream roll 23 will be conveyed to the installation position of the cutter roll 51. FIG. The first continuous sheet 3a is cut into the cut sheet 3 by the cutter roll 51 in an appropriate stretched state, and the cut and generated cut sheet 3 remains in the stretched state with the non-stretchable first sheet 3a. The two continuous sheets 2a are conveyed to the joining position and joined to the second continuous sheet 2a at a predetermined pitch. Thus, the above-described composite sheet continuous body 1a is manufactured.

  Here, when the sheet 3a is stretched between the upstream roll 21 and the downstream roll 23 in order to develop the stretchability of the first continuous sheet 3a, the sheet 3a is greatly reduced in width. The dimension in the width direction 3a (hereinafter also referred to as the width dimension) is significantly narrowed. Then, the width dimension of the 1st continuous sheet 3a will become significantly narrower than the target width defined by the relationship with the width dimension of the 2nd continuous sheet 2a. Further, if the width reduction (hereinafter also referred to as necking) is large, there is a possibility that the expansion / contraction characteristics that should be obtained when the first continuous sheet 3a is expanded at a predetermined magnification cannot be obtained.

  The present invention has been made in view of the conventional problems as described above, and the purpose thereof is to develop stretchability by stretching the first continuous sheet in which stretchability has not yet been developed. The first continuous sheet is cut to produce a single sheet, and the produced single sheet is joined to the second continuous sheet in an expanded state to produce a continuous sheet composite. In the process, necking that may occur in the first continuous sheet is suppressed.

The main invention for achieving the above object is:
A stretchable cut sheet is produced by cutting from the first continuous sheet that develops stretchability in the continuous direction by being stretched in the continuous direction, and the cut sheet is formed on the second continuous sheet. A method of producing a composite of continuous sheets by overlapping and joining,
The upstream roll and the downstream roll rotating around the first continuous sheet in an S-shape along the continuous direction of the first continuous sheet on the upstream roll and the downstream roll rotating with the outer peripheral surfaces facing each other. By making a difference in the peripheral speed value with the downstream roll, the first continuous sheet is stretched in the continuous direction at a predetermined magnification, and the first continuous sheet is made stretchable,
Cutting the first continuous sheet exhibiting stretchability in a stretched state to produce the cut sheet in a stretched state;
Bonding the generated sheet-like sheet in the stretched state to the second continuous sheet, a method for producing a composite of continuous sheets according to an absorbent article.

Also,
A stretchable cut sheet is produced by cutting from the first continuous sheet that develops stretchability in the continuous direction by being stretched in the continuous direction, and the cut sheet is formed on the second continuous sheet. An apparatus for producing a composite of continuous sheets by overlapping and joining,
The upstream roll and the downstream roll rotating around the first continuous sheet in an S-shape along the continuous direction of the first continuous sheet on the upstream roll and the downstream roll rotating with the outer peripheral surfaces facing each other. A stretchable expression device that stretches the first continuous sheet in the continuous direction at a predetermined magnification and expresses stretchability in the first continuous sheet by making a difference in peripheral speed value with the downstream roll,
A cutting device for cutting the first continuous sheet exhibiting stretchability in a stretched state to generate the cut sheet in the stretched state;
It has a joining apparatus which joins the produced | generated said sheet-like sheet | seat of the said extended state to a said 2nd continuous sheet, It is a manufacturing apparatus of the composite of the continuous sheet which concerns on an absorbent article characterized by the above-mentioned.

  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, stretchability is expressed by stretching the first continuous sheet in which stretchability is not yet developed, and the first continuous sheet in which stretchability is developed is cut to generate a single sheet. When manufacturing the composite of a continuous sheet | seat by joining the obtained sheet-like sheet | seat to a 2nd continuous sheet in the expansion | extension state, the necking which may arise in a 1st continuous sheet in this manufacturing process can be suppressed.

It is a schematic side view which shows the comparative example of the manufacturing method of the composite of a continuous sheet. 2A is a schematic plan view of the back sheet 1, FIG. 2B is a schematic plan view of an intermediate part 1 a that is the basis of the back sheet 1, and FIG. 2C is a stretchable film that forms part of the back sheet 1. 3 is a schematic side view of FIG. It is a graph of the load P-elongation characteristic of the elastic film 3. FIG. FIG. 3 is an explanatory view of the method for manufacturing the continuous sheet composite of the first embodiment, and is a schematic side view of the manufacturing apparatus 10. It is explanatory drawing of the manufacturing method of the composite of the continuous sheet of 2nd Embodiment, Comprising: It is a schematic side view of the manufacturing apparatus 10a. It is explanatory drawing of the manufacturing method of the composite of the continuous sheet of 3rd Embodiment, Comprising: It is a schematic side view of the manufacturing apparatus 10b.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
A stretchable cut sheet is produced by cutting from the first continuous sheet that develops stretchability in the continuous direction by being stretched in the continuous direction, and the cut sheet is formed on the second continuous sheet. A method of producing a composite of continuous sheets by overlapping and joining,
The upstream roll and the downstream roll rotating around the first continuous sheet in an S-shape along the continuous direction of the first continuous sheet on the upstream roll and the downstream roll rotating with the outer peripheral surfaces facing each other. By making a difference in the peripheral speed value with the downstream roll, the first continuous sheet is stretched in the continuous direction at a predetermined magnification, and the first continuous sheet is made stretchable,
Cutting the first continuous sheet exhibiting stretchability in a stretched state to produce the cut sheet in a stretched state;
Bonding the generated sheet-like sheet in the stretched state to the second continuous sheet, a method for producing a composite of a continuous sheet according to an absorbent article.

  According to the method for manufacturing a composite of continuous sheets according to such an absorbent article, since the first continuous sheet is wound around the upstream roll and the downstream roll in an S shape, the upstream roll and the downstream roll The first continuous sheet can be stretched between the side rolls with a short span. Therefore, necking that may occur when the first continuous sheet is stretched for the purpose of expressing stretchability can be suppressed. The reason why necking is reduced by spanning over a short span will be described later.

A method for producing a composite of continuous sheets according to such an absorbent article,
Between expressing the stretchability in the first continuous sheet and generating the cut sheet,
Stretching the first continuous sheet by causing the first continuous sheet exhibiting elasticity to abut on and hold a first rotating member that rotates at a first speed value smaller than the peripheral speed value of the downstream roll. Conveying between the downstream roll and the first rotating member while relaxing,
The first continuous sheet is held in contact with a second rotating member that rotates at a second speed value that is greater than the first speed value of the first rotating member and less than the peripheral speed value of the downstream roll. Re-stretching the first continuous sheet to a stretched state smaller than the stretched state at the predetermined magnification,
In generating the cut sheet, it is preferable that the first continuous sheet in the re-stretched state is cut to generate the stretched single sheet.

According to the method for manufacturing a composite of continuous sheets according to such an absorbent article, in the transport path from the downstream roll to the first rotating member, the first rotating member has a first speed higher than the peripheral speed value of the downstream roll. By reducing the 1 speed value, the first continuous sheet is conveyed while being relaxed. Therefore, it is possible to effectively avoid that necking is promoted by the tension applied to the first continuous sheet during the conveyance.
Further, when the first continuous sheet is re-stretched so as to join the single sheet-like sheet to the second continuous sheet under stretching, the stretched state is kept smaller than the stretched state at the predetermined magnification relating to the expression of stretchability. Therefore, the re-extension can be performed quickly without difficulty.

A method for producing a composite of continuous sheets according to such an absorbent article,
The second rotating member has a holding member that moves along the continuous direction at the second speed value that is larger than the first speed value of the first rotating member and smaller than the peripheral speed value of the downstream roll. And
In the re-extension, the holding member moves at the second speed value while the first continuous sheet conveyed from the first rotating member is sucked and held by the holding member. Re-extend the sheet,
In generating the cut sheet, by cutting the first continuous sheet sucked and held by the holding member in the re-stretched state while maintaining the re-stretched state on the holding member, Create a cut sheet,
In joining to the second continuous sheet, the sheet-like sheet that moves integrally with the holding member while being held in the re-extended state by the holding member is moved along the moving direction of the holding member. It is desirable that the single-sheet sheet in the re-extended state is delivered from the holding member to the second continuous sheet by bonding to the second continuous sheet being conveyed.

  According to the method for manufacturing a composite of continuous sheets according to such an absorbent article, the first continuous sheet is reliably re-extended based on the difference between the first speed value of the first rotating member and the speed value of the holding member. can do. In addition, the re-stretched first continuous sheet can be quickly maintained in a re-stretched state by sucking and holding the holding member. Further, the cut sheet generated by cutting from the first continuous sheet is also held by suction on the holding member, so that it is maintained in a re-extended state equivalent to that before cutting. Therefore, the single-cut sheet can be joined to the second continuous sheet under the same elongation as the re-stretched state.

A method for producing a composite of continuous sheets according to such an absorbent article,
At least one roller is disposed between the first rotating member and the second rotating member, and the first continuous sheet is wound around the outer peripheral surface of the roller at a predetermined winding angle. Is desirable.
According to the method for producing a composite of continuous sheets according to such an absorbent article, the transport route between the first rotating member and the second rotating member is divided into a plurality by the roller, The span length is short span. Therefore, necking of the first continuous sheet that can occur in the conveyance route during re-extension is effectively suppressed. Incidentally, the reason why necking can be suppressed by the roller can be paraphrased as follows. The contraction deformation in the width direction of the first continuous sheet can be effectively restrained by the frictional force between the outer peripheral surface of the roller and the first continuous sheet. Necking of the first continuous sheet that can occur with the rotating member can be effectively suppressed.

A method for producing a composite of continuous sheets according to such an absorbent article,
It is desirable that a pressing roller that presses a portion of the first continuous sheet that is wound around the outer peripheral surface of the upstream roll against the outer peripheral surface is provided to face the outer peripheral surface.
According to the manufacturing method of the composite of the continuous sheet which concerns on such an absorbent article, the relative slip of the 1st continuous sheet in the outer peripheral surface of an upstream roll can be suppressed. Therefore, the shrinkage deformation in the width direction of the first continuous sheet can be effectively restrained by the frictional force between the outer peripheral surface of the upstream roll and the first continuous sheet, and as a result, the upstream roll and the downstream roll Necking that can occur in the first continuous sheet during stretching between the two can be effectively suppressed.

A method for producing a composite of continuous sheets according to such an absorbent article,
The upstream roll and the downstream roll are arranged close to each other so that the size of the gap between the upstream roll and the downstream roll is larger than the thickness of the first continuous sheet and equal to or less than 10 mm. It is desirable.
According to the method for manufacturing a composite of continuous sheets according to such an absorbent article, since the upstream roll and the downstream roll are arranged close to each other, the first continuous sheet is short spanned between these rolls. Can be handed over. Therefore, the necking of the 1st continuous sheet which may arise when these rolls are extended | stretched can be suppressed effectively.

A method for producing a composite of continuous sheets according to such an absorbent article,
The first rotating member includes a pair of rotating rollers, and an endless belt that is wound around the pair of rollers and sucks and holds the first continuous sheet on an outer peripheral surface,
The downstream roller of the pair of rollers preferably has a smaller diameter than the upstream roll and the downstream roll.
According to the manufacturing method of the composite of the continuous sheet which concerns on such an absorbent article, the said downstream roller which the 1st rotation member comprises is the upstream roll for expressing stretchability in the 1st continuous sheet, and Since the diameter is smaller than that of the downstream roll, it is easy to dispose the second rotating member in proximity. Thus, a short span can be set between the first rotating member and the second rotating member at the time of re-extension, and as a result, necking of the first continuous sheet at the time of re-extension is effectively suppressed.

  Incidentally, the reason why the diameter of the downstream roller applied to the first rotating member can be made smaller than that of the upstream roll or the downstream roll is as follows. When the first continuous sheet is stretched for the first time to exhibit stretchability, the sheet does not stretch unless a large tensile load is applied. Therefore, at the time of extension, a large static friction force must be secured from the outer peripheral surface of the upstream roll and the downstream roll as a reaction force of the tensile load. Is required. On the other hand, since the stretchability has already been developed at the second and subsequent stretches, the first continuous sheet is stretched with a remarkably small tensile load. Therefore, the frictional force on the outer peripheral surface as a reaction force of the tensile load may be relatively small, and as a result, the downstream roller related to the first rotating member can be reduced in diameter.

A method for producing a composite of continuous sheets according to such an absorbent article,
In conveying between the downstream roll and the first rotating member, the guide device provided between the downstream roll and the first rotating member allows the direction related to the direction intersecting the continuous direction. It is desirable that the shift of the traveling position of the first continuous sheet is suppressed.
According to the manufacturing method of the composite of the continuous sheet which concerns on such an absorbent article, in connection with the expansion | extension of a 1st continuous sheet being relieve | moderated in conveying between a downstream roll and a 1st rotation member. The shift of the traveling position of the same sheet in the direction crossing the continuous direction of the first continuous sheet that can occur is effectively suppressed by the guide device. Therefore, stabilization of the conveyance state in conveying between a downstream roll and the 1st rotation member can be aimed at.

A method for producing a composite of continuous sheets according to such an absorbent article,
The stretched state of the first continuous sheet extends at least the second sheet between the second continuous sheet and the generation of the single sheet. It is desirable that the cut sheet is maintained in the stretched state when bonded to the continuous sheet.
According to the method for manufacturing a composite of continuous sheets according to such an absorbent article, the first continuous sheet according to the cut sheet is not re-elongated before the cut sheet is joined to the second continuous sheet. I'll do it. Therefore, necking that may occur during such re-extension can be suppressed.

A method for producing a composite of continuous sheets according to such an absorbent article,
Between expressing the stretchability in the first continuous sheet and generating the cut sheet,
By bringing the first continuous sheet exhibiting stretchability into contact with a third rotating member that rotates at a third speed value of 0.9 times or more and 1.1 times or less of the peripheral speed value of the downstream roll. And conveying the first continuous sheet from the downstream roll to the third rotating member,
Generating the cut sheet is
The first continuous sheet fed from the third rotating member is moved along the continuous direction at a fourth speed value that is 0.9 to 1.1 times the peripheral speed value of the downstream roll. Adsorbing and holding by a holding member;
Generating the sheet-like sheet by cutting the first continuous sheet adsorbed and held by the holding member in the extended state while maintaining the extended state on the holding member;
In joining to the second continuous sheet,
By joining the sheet-like sheet that moves integrally with the holding member while being held in the extended state by the holding member, to the second continuous sheet that is conveyed along the moving direction of the holding member. It is desirable that the single-cut sheet in the stretched state is delivered from the holding member to the second continuous sheet.
According to the method for manufacturing a composite of continuous sheets according to such an absorbent article, the first continuous sheet is substantially the same as the peripheral speed value of the downstream roll on the conveyance path between the downstream roll and the holding member. Transported at speed value. Therefore, the conveyance path can be conveyed in a short time, and as a result, the productivity of the composite of continuous sheets can be increased.
A stretchable cut sheet is produced by cutting from the first continuous sheet that develops stretchability in the continuous direction by being stretched in the continuous direction, and the cut sheet is formed on the second continuous sheet. An apparatus for producing a composite of continuous sheets by overlapping and joining,
The upstream roll and the downstream roll rotating around the first continuous sheet in an S-shape along the continuous direction of the first continuous sheet on the upstream roll and the downstream roll rotating with the outer peripheral surfaces facing each other. A stretchable expression device that stretches the first continuous sheet in the continuous direction at a predetermined magnification and expresses stretchability in the first continuous sheet by making a difference in peripheral speed value with the downstream roll,
A cutting device for cutting the first continuous sheet exhibiting stretchability in a stretched state to generate the cut sheet in the stretched state;
An apparatus for manufacturing a composite of continuous sheets according to an absorbent article, comprising: a joining device that joins the generated sheet-like sheet in the stretched state to the second continuous sheet.
According to the continuous sheet composite manufacturing apparatus relating to such an absorbent article, the first continuous sheet is wound around the upstream roll and the downstream roll in an S-shape, so the upstream roll and the downstream roll The first continuous sheet can be stretched between the side rolls with a short span. Therefore, necking that may occur when the first continuous sheet is stretched for the purpose of expressing stretchability can be suppressed.

=== First Embodiment ===
In the manufacturing method of the composite of the continuous sheet of 1st Embodiment, the intermediate component 1a used as the origin of the back surface sheet 1 of a disposable diaper is manufactured as an example of the said composite. FIG. 2A is a schematic plan view of the back sheet 1, and FIG. 2B is a schematic plan view of an intermediate part 1 a that is the basis of the back sheet 1. FIG. 2C is a schematic side view of the stretchable film 3 that forms part of the back sheet 1.

  As shown to FIG. 2A, the back surface sheet 1 is the exterior sheet 2 which makes the exterior of a diaper, and the elastic film 3 affixed on the inner surface (surface located in a wearer's skin side) of the exterior sheet 2; The composite sheet 1 having And on this back surface sheet 1, a liquid-impervious leak-proof film (not shown), an absorber (not shown) formed by forming pulp fibers, a liquid-permeable face sheet (not shown), etc. Laminated and fixed, thereby creating a diaper base.

  Examples of the material of the exterior sheet 2 include a flexible nonwoven fabric mainly composed of resin fibers and the like, and here is a non-stretchable nonwoven fabric. The concept of non-stretchability mentioned here includes not only the lack of stretchability but also that the elastic modulus is very high, that is, it does not elastically stretch unless a large tensile load is applied. And in this example, the elasticity modulus of this exterior sheet 2 is significantly higher than the elasticity modulus of the stretchable film 3 after stretchability expression. Therefore, the stretchability of the backsheet 1 formed by joining the stretchable stretchable film 3 to the exterior sheet 2 is mainly derived from the stretchability of the stretchable film 3, so that it is flexible even with a relatively small load. Elastically deformed.

  More specifically, in the natural length back sheet 1 in a shortened state, the exterior sheet 2 has a bowl shape due to the contraction force of the stretchable film 3, and when the back sheet 1 is extended from this shortened state. In that case, only the elastic force of the stretchable film 3 is mainly the resistance force, and the non-stretchable exterior sheet 2 is merely stretched and the resistance force is not generally generated. . Therefore, the exterior sheet 2 does not substantially contribute to the stretchability of the back sheet 1.

  On the other hand, as shown in FIG. 2C, the stretchable film 3 is a laminate film having a three-layer structure. The upper layer 3Lu and the lower layer 3Ld in the thickness direction are made of an extensible resin film that can be stretched inelastically (that is, plastically), while the intermediate layer 3Lm between the upper layer 3Lu and the lower layer 3Ld is used. Uses a stretchable resin film that is elastically stretchable. Therefore, if the stretchable film 3 having such a three-layer structure is stretched at least once in a predetermined direction, the stretchable film 3 exhibits stretchability in a predetermined direction thereafter.

  FIG. 3 is an explanatory diagram showing the expression of the stretchability, and shows the load P-elongation characteristics of the stretchable film 3. The expansion ratio on the horizontal axis is obtained by dividing the length at the time of expansion by the length before expansion (when not expanded). Here, once expanded to a predetermined magnification (for example, 2 times) in a predetermined direction as shown by a solid line in FIG. 3, when expanding below a predetermined magnification thereafter, first, as shown by a dotted line in FIG. It becomes possible to extend with a tensile load P (dotted line) that is much smaller than the tensile load P (solid line) at the time of extension, and when this tensile load P is unloaded, it almost follows the same dotted line route to the original length. Shrink and come back. That is, once it is stretched and deformed, it is then stretched and deformed with a small elastic modulus, and this state is referred to herein as “stretchability is expressed”.

  The reason why the stretchability is manifested by a single stretching process is considered as follows. That is, the intermediate layer 3Lm is only elastically deformed at the first extension, but the upper and lower layers 3Lu, 3Ld are stretched in a predetermined direction due to plastic deformation and the like. This is because the upper and lower layers 3Lu and 3Ld cannot generate a resistance force when stretched, and as a result, the upper and lower layers 3Lu and 3Ld are elastically deformed only by the elastic force of the stretchable resin film of the intermediate layer 3Lm. Therefore, as a change in appearance, after unloading by performing the first extension deformation, for example, a large number of hook-shaped slack portions are generated in the upper layer 3Lu and the lower layer 3Ld. In the second and subsequent extension deformations, the slack portion simply extends in the upper layer 3Lu and the lower layer 3Ld, and the upper layer 3Lu and the lower layer 3Ld generally contribute to the resistance force of the tensile load P related to the extension deformation. In other words, it is almost countered only by the elastic force of the intermediate layer 3Lm, and as described above, stretchability is expressed in the stretchable film 3 by a single stretch process in a predetermined direction.

  The intermediate part 1a which becomes the origin of such a back surface sheet 1 is a composite 1a of continuous sheets as shown in FIG. 2B. That is, the intermediate part 1a is formed on a continuous web 2a of nonwoven fabric as a raw material of the exterior sheet 2, and a plurality of single-sheet stretchable films 3, with a sticking pitch P3 substantially equal to the product pitch P1 in the continuous direction. 3 is pasted.

  And such an intermediate component 1a is manufactured by the manufacturing apparatus 10 shown in the schematic side view of FIG. The manufacturing apparatus 10 includes an upstream roll 21, a downstream roll 23, a transport roller 31, a guide device 33, a suction belt conveyor 35, a rotary drum device 41, a cutter roll 51, and a press roll 61. These are sequentially arranged in this order from upstream to downstream in the conveying direction of the production line. And these each apparatus 21,23,31,33,35,41,51,61 cooperates mutually, elasticity development process S1, relaxation conveyance process S2, re-extension process S3, cutting process S4, and joining process S5 As a result, the above-described intermediate part 1a is manufactured.

That is, in brief, first, in the stretch development step S1, the stretch film 3 in which stretch is not developed on the upstream roll 21 and the downstream roll 23 that rotate while the outer peripheral surfaces 21a and 23a face each other. The continuous film 3a which is a raw fabric is wound around in an S shape. Then, by making a difference in the peripheral speed values V21 and V23 between the upstream roll 21 and the downstream roll 23, the continuous film 3a is stretched in the continuous direction at a predetermined stretching magnification M1, and is stretched to the continuous film 3a. To express sex.
In the next relaxation conveying step S2, the film is conveyed from the downstream roll 23 to a position P41 in the vicinity of the rotary drum device 41 while relaxing (relaxing) the stretched state of the continuous film 3a exhibiting stretchability.
In the next re-stretching step S3, the stretched state is relaxed and the shortened continuous film 3a is stretched again, and is sucked and held by the holding pad 43 of the rotary drum device 41 that moves along the predetermined circular trajectory Tr43.
In the next cutting step S4, the continuous film 3a sucked and held on the holding pad 43 in a re-stretched state is cut on the holding pad 43 to generate a single-cut film 3. Incidentally, this single-cut film 3 is the aforementioned stretchable film 3.
In the final joining step S5, when the holding pad 43 passes through the delivery position Pout of the orbiting track Tr43 of the holding pad 43, the sheet-like film 3 is applied to the continuous web 2a which is the original sheet of the exterior sheet 2 traveling at the position Pout. Join and deliver. Thereby, the above-described intermediate part 1a is completed.

Each step S1, S2,... S5 will be described in detail below, but before that, various directions and terms are defined. First, the continuous direction of the continuous film 3a is referred to as “MD direction”, and the width direction of the continuous film 3a is referred to as “CD direction”. In FIG. 4, the MD direction faces an arbitrary direction parallel to the paper surface. That is, as shown in FIG. 4, when two directions orthogonal to each other in the plane of the page are defined as a vertical direction and a front-rear direction, an arbitrary direction defined by these two directions is the MD direction. In addition, the up-down direction is a vertical direction, and the front-rear direction is directed to the horizontal direction.
On the other hand, the CD direction is a direction penetrating the paper surface of FIG. Therefore, the CD direction and the MD direction are orthogonal to each other. In addition, since the continuous film 3a is conveyed in a continuous direction, MD direction is also the conveyance direction of a manufacturing line. Further, the CD direction is parallel to the width direction of the continuous web 2a related to the exterior sheet 2, and in this example, the CD direction is directed to the horizontal direction.
The “continuous film 3a” and the “single sheet film 3” correspond to the “first continuous sheet” and the “single sheet sheet” according to the claims, respectively, and the “continuous web 2a according to the exterior sheet 2”. Corresponds to the “second continuous sheet” according to the claims.

<<< Elasticity development process S1 >>>
The stretch development step S <b> 1 is performed by both the upstream roll 21 and the downstream roll 23. That is, these rolls 21 and 23 jointly constitute a stretchable expression device. The upstream-side roll 21 and the downstream-side roll 23 are rolls having a circular cross section that are driven and rotated around the rotation axes C21 and C23 along the CD direction, respectively. And these rolls 21 and 23 are arrange | positioned adjacently in the state which separated the small clearance gap G1 between the outer peripheral surfaces 21a and 23a which mutually oppose. The size of the gap G1 relates to suppression of necking of the continuous film 3a, which will be described later.

  On the upstream roll 21 and the downstream roll 23, a continuous film 3a fed from an original fabric roll that has not developed stretchability is wound around in an S shape. Then, the continuous film 3a is wound around the outer peripheral surfaces 21a and 23a of the rolls 21 and 23 at a predetermined winding angle and comes into contact with the rolls 21 and 23 in a surface contact state. It is transported downstream in the MD direction at substantially the same speed value as the peripheral speed values V21 and V23 of the rolls 21 and 23 without slipping with respect to the roll 23a.

  Here, the circumferential speed value V21 of the upstream roll 21 is set to a speed value substantially the same as the transport speed value V3a of the continuous film 3a when being fed into the upstream roll 21 from the upper process, but the downstream roll The circumferential speed value V23 of 23 is set to a speed value larger than the circumferential speed value V23 of the upstream roll 21. Therefore, the continuous film 3a is stretched in the MD direction at the stretching magnification M1 (= V23 / V21) based on the difference between the peripheral speed values V21 and V23 between the rolls 21 and 23. As a result, the continuous film 3a MD direction elasticity is developed.

  The expansion ratio M1 is set so that the extended state in the stretchable expression step S1 is larger than the extended state in the subsequent re-extension step S3. And thereby, the smooth elasticity in the expansion-contraction specification set to the back sheet 1 of the final product diaper is ensured. That is, the range from the contraction limit to the extension limit, which is the expansion / contraction specification of the back sheet 1, is formed by joining the stretchable stretchable film 3a to the continuous web 2a of the exterior sheet 2 in the re-stretching step S3, and The extension state in the re-extension step S3 corresponds to the extension limit of the expansion / contraction specification. On the other hand, the extension limit of the stretch specification of the stretch film 3 itself is determined based on the stretch state in the stretch development step S1. Therefore, if the stretched state in the stretchable expression step S1 is made larger than the stretched state in the restretching step S3, the stretchable specification (design specification) of the back sheet 1 within the stretchable specification range of the stretchable film 3 itself. As a result, it is possible to effectively prevent a situation in which the expansion / contraction specification of the back sheet 1 is limited due to the expansion / contraction specification factor of the elastic film 3 itself. In this example, in order to set the size relationship of the stretched state as described above, the magnification M1 in the stretched state S1 with respect to the unstretched state is set to the stretch in the restretching step S3 with respect to the unstretched state. This is set larger than the state magnification M3, which will be described later. Incidentally, the above-mentioned “unstretched state” refers to the state of the continuous film 3a immediately before being fed to the upstream roll 21 or the state of the continuous film 3a wound around the upstream roll 21. Yes, that is, a state where there is substantially no decompression history.

  In this example, when the peripheral speed value V21 of the upstream roll 21 is set to the reference value V1, the peripheral speed value V23 is set so that the peripheral speed value V23 of the downstream roll 23 is, for example, 2.6 × V1. Are adjusted sequentially. That is, the rotation speed of the downstream roll 23 is controlled so that the ratio of the peripheral speed value V23 of the downstream roll 23 to the peripheral speed value V21 of the upstream roll 21 (= V23 / V21) is always constant. As a result, even if the peripheral speed value V21 of the upstream roll 21 changes in conjunction with the transport speed value V3a of the continuous film 3a when being fed into the manufacturing apparatus 10 from the upper process, the expansion and contraction occurs. The expansion ratio M1 in the sex expression step S1 is maintained at a constant value of 2.6 (= V23 / V21 = 2.6 × V1 / V1) times. However, the expansion ratio M1 in the step S1 is not limited to 2.6 times as described above, and may be set to an arbitrary value selected from a range of 1.8 times to 5 times, for example.

  By the way, in this example, the continuous film 3a is wound around the upstream roll 21 and the downstream roll 23 in an S-shape. However, according to this S-hanging configuration, necking that may occur when the continuous film 3a is stretched is effectively performed. Can be suppressed. This will be described below.

  Necking means that when the continuous film 3a is stretched in the MD direction as described above, the film 3a shrinks in the CD direction, that is, the width is reduced. It can be suppressed by shortening the span length L1 (hereinafter also referred to as the span length L1), which is the length of the portion spanned between them. The reason for this is that the shrinkage deformation in the CD direction that occurs in the continuous film 3a along with the extension in the MD direction is constrained by the frictional force in the CD direction between the outer peripheral surfaces 21a and 23a of the rolls 21 and 23 and the continuous film 3a. This is because the restraint effect is reduced and the effect of the restraint becomes smaller as the distance from the position where the frictional force is applied. Therefore, shortening the span length L1 is very effective for suppressing necking.

  On the other hand, as an example of a method of wrapping the continuous film 3a between a pair of rolls 21 and 23, a method of wrapping in a Japanese katakana U-shape as in the comparative example of FIG. The span length L1 cannot be made shorter than the sum of the radii R21 and R23 of the pair of rolls 21 and 23, and it is difficult to shorten the span length L1. About this point, if it hangs around in S shape like FIG. 4, the span length L1 can be set shorter than the sum of radius R21, R23 of a pair of rolls 21 and 23. FIG. Therefore, in order to shorten the span length L1, in this first embodiment, so-called S-hanging is adopted as a winding method of the upstream roll 21 and the downstream roll 23.

  Further, in this S-hanging configuration, the span length L1 can be shortened as the gap G1 between the pair of rolls 21 and 23 is narrower. Therefore, desirably, the gap G1 is set to an arbitrary value in the range of 10 mm or less larger than the thickness of the continuous film 3a. In this example, considering that the thickness of the continuous film 3a is an arbitrary value in the range of 10 to 50 μm and the safety allowance, the gap G1 is set to an arbitrary value of 1 mm to 5 mm. In some cases, an arbitrary value of 0.6 to 10 mm may be set.

  Furthermore, in the first embodiment, a rubber layer having a high anti-slip function is used as the outermost layer forming the outer peripheral surfaces 21a and 23a of the rolls 21 and 23 in order to further enhance the restraint of shrinkage deformation in the CD direction of the continuous film 3a. In addition, the surface of the rubber layer is further roughened with sand vapor. However, in the case where the material of the continuous film 3a itself has a high anti-slip action, the above-mentioned anti-slip measures do not have to be taken, that is, the metal of the rolls 21 and 23 is exposed on the outer peripheral surfaces 21a and 23a. There is no need for roughening treatment. By the way, the above-mentioned anti-slip measure also exerts an anti-slipping action in the MD direction of the continuous film 3a, so that the stretchability of the continuous film 3a is expressed by the difference in the peripheral speed values V21, V23 between the rolls 21, 23. Also effective.

  In the example of FIG. 4, for the same purpose of preventing slipping, the upstream roll 21 is provided with a pressing roller 25 that presses the continuous film 3 a against the outer peripheral surface 21 a. The pressing roller 25 is a roller member that can rotate around the rotation axis C <b> 25 along the CD direction, and is disposed in the vicinity of the winding start position of the continuous film 3 a around the upstream roll 21. And also by this pressing roller 25, the anti-slip | skid effect | action of CD direction and MD direction can be show | played.

  The pressing roller 25 may be a driving roller that is driven and rotated at a peripheral speed value V25 that is substantially the same as the peripheral speed value V21 of the upstream roll 21 by an appropriate driving source such as a motor. It may be a driven roller that rotates with the upstream roll 21 or the continuous film 3a. Further, the installation position of the pressing roller 25 is not limited to the vicinity of the above-described winding start position, and may be installed at a position downstream of that. Furthermore, the pressing roller 27 having the same configuration may be installed facing the outer peripheral surface 23 a of the downstream roll 23, and the continuous film 3 a may be pressed against the outer peripheral surface 23 a of the downstream roll 23 by the pressing force of the pressing roller 27. .

<<< Loosening conveyance process S2 >>>
The relaxation transport process S2 is basically performed by the downstream roll 23, the transport roller 31, and the suction belt conveyor 35 (corresponding to the first rotating member). That is, these devices 23, 31, and 35 constitute a relaxation transport device.

  The conveyance roller 31 is a relay roller 31 for guiding the continuous film 3a from the downstream roll 23 to the suction belt conveyor 35, and rotates around the rotation axis C31 along the CD direction. And in this example, the conveyance roller 31 is comprised as a driven roller which obtains a rotational force from the continuous film 3a contact | abutted to the outer peripheral surface 31a, and rotates around. However, in some cases, it may be configured as a drive roller that is driven and rotated by a drive source such as a motor. In the case of a driving roller, the peripheral speed value V31 is set to a value between the peripheral speed value V23 of the downstream roll 23 and the peripheral speed value V36 of the endless belt 36 of the suction belt conveyor 35, and preferably The latter circumferential speed value V36 is preferably set to the same value.

  The suction belt conveyor 35 is a device 35 for transporting the continuous film 3 a exhibiting stretchability to a position P41 in the vicinity of the rotating drum device 41, and is disposed in a position P41 in the vicinity of the rotating drum device 41. The suction belt conveyor 35 is wound around the pair of rollers 37a and 37b, which are arranged at intervals in the MD direction and rotate around the rotation axes C37a and C37b along the CD direction, and the pair of rollers 37a and 37b. And an endless belt 36. And at least one roller 37a (37b) of the pair of rollers 37a and 37b is a driving roller that rotates by obtaining a driving force from an appropriate driving source such as a motor. The outer peripheral surface 36a of the endless belt 36 is provided with a plurality of intake holes (not shown) over the entire circumference, and the outer peripheral surface 36a of the endless belt 36 has a suction holding function by the intake of the intake holes. doing. Accordingly, the continuous film 3a is driven and circulated while adsorbing and holding the continuous film 3a in a surface contact state on the outer peripheral surface 36a of the endless belt 36, whereby the continuous film 3a is conveyed in the MD direction together with the endless belt 36. The

  Here, the circumferential speed value V36 (corresponding to the first speed value) related to the driving circumference of the endless belt 36 is much smaller than the circumferential speed value V23 of the downstream roll 23 that is also involved in the stretch development step S1. The speed value is set. Specifically, the circumferential speed value V36 is lowered to a speed value at a level at which a minimum tension that enables the continuous film 3a to be conveyed can be applied. As a result, the elongation imparted to the continuous film 3a in the stretch development step S1 of the immediately preceding step is greatly relaxed, and the film 3a is greatly shortened in the MD direction, while the downstream roll 23 is near the rotary drum device 41. It is conveyed to position P41. And since the expansion | extension of the continuous film 3a is eased to the limit of the level which does not become impossible of conveyance in this way, even under the situation where the necking of the continuous film 3a after the expression of stretchability is likely to occur, The promotion is effectively avoided.

  By the way, in this example, the size of the peripheral speed value V23 of the downstream roll 23 related to the stretch development process S1 was 2.6 × V1, whereas the suction belt conveyor 35 related to the relaxation transport process S2 The magnitude of the circumferential speed value V36 of the endless belt 36 is set to 1.4 × V1, for example, and the amount corresponding to the decrease in the speed value (1.2V1 = V23−V36 = 2.6V1−1.4V1) is downstream. In the transport route from the side roll 23 to the position P41 in the vicinity of the rotary drum device 41, the stretched state of the continuous film 3a is relaxed, and the film 3a is shortened in the MD direction, so that necking is effectively suppressed. . Further, as apparent from the above description that “the magnitude of the circumferential speed value V36 is 1.4 × V1”, the circumferential speed value V36 of the endless belt 36 is also linked to the change in the circumferential speed value V21 of the upstream roll 21. And change. Therefore, even if the peripheral speed value V21 of the upstream roll 21 changes in conjunction with the transport speed value V3a of the continuous film 3a when being fed into the manufacturing apparatus 10 from the upper process, the slack transport process S3. The tension at the time of conveyance is maintained substantially constant.

  However, since the tension used for the conveyance is reduced to the limit, in the relaxed conveyance step S2, the running of the continuous film 3a becomes unstable, and it becomes easy to meander in the CD direction. That is, the running position of the continuous film 3a is likely to shift from a predetermined target position in the CD direction to both sides in the CD direction. Therefore, in the example of FIG. 4, a guide device 33 for stabilizing the travel position in the CD direction is provided on the travel route between the downstream roll 23 and the suction belt conveyor 35 (same meaning as the above transport route). Accordingly, the position of the continuous film 3a in the CD direction is adjusted so that the center position of the continuous film 3a is aligned with the target position in the CD direction.

  As an example of such a guide device 33, an edge sensor 33s for detecting the position of the edge of the continuous film 3a in the CD direction and a pair of continuous films 3a wound in a Japanese katakana U shape at a predetermined winding angle. Information on the position of the edge of the continuous film 3a transmitted from the edge sensor 33s and the actuator (not shown) that swings the guide rollers 34a and 34b, the pair of guide rollers 34a and 34b around the predetermined axis C33 integrally with each other. And a controller (not shown) for controlling the actuator based on the above.

  By the way, it is advisable to take anti-slip measures for the outer peripheral surface 36a of the endless belt 36 of the suction belt conveyor 35. Then, the relative slip in the MD direction between the endless belt 36 and the continuous film 3a can be prevented more reliably, and the continuous film 3a can be reliably secured at a speed value substantially the same as the circumferential speed value V36 of the endless belt 36. Can be transported. Thus, the extension of the continuous film 3a can be more reliably mitigated by the difference between the peripheral speed value V23 of the downstream roll 23 and the peripheral speed value V36 of the endless belt 36 of the suction belt conveyor 35. As an example of such an anti-slip measure, the outermost layer forming the outer peripheral surface 36a of the endless belt 36 may be a rubber layer. Incidentally, the above-mentioned anti-slip measures also contribute to the suppression of shrinkage of the continuous film 3a in the CD direction, and are therefore effective as a suppression measure for necking.

<<<< Re-extension process S3, cutting process S4, joining process S5 >>
The re-extension step S3, the cutting step S4, and the joining step S5 are all performed using the rotary drum device 41. That is, the re-extension step S3 is performed between the suction belt conveyor 35 and the rotary drum device 41, the cutting step S4 is performed between the rotary drum device 41 and the cutter roll 51, and the joining step S5 is performed. This is performed between the rotary drum device 41 and the press roll 61. In other words, the re-extension apparatus that performs the re-extension process S3 includes the rotary drum apparatus 41 and the suction belt conveyor 35, and the cutting apparatus that performs the cutting process S4 includes the rotary drum apparatus 41 and the cutter. It can also be said that the joining apparatus configured by the roll 51 and performing the joining step S5 is configured by the rotary drum device 41 and the press roll 61.

  The multipurpose rotating drum device 41 (corresponding to the second rotating member) has a plurality of holding pads 43, 43... (Corresponding to the holding member). These holding pads 43, 43... Circulate around a predetermined orbiting track Tr 43 in one direction (clockwise in FIG. 4) while maintaining one line of alignment. The shape of the circular trajectory Tr43 is set to a perfect circle shape with the center axis C41 facing the CD direction as a center.

  Each holding pad 43 has a holding surface 43a having an arcuate shape along the circular trajectory Tr43 so as to face outward in the rotating radial direction Dr43. Each holding surface 43a is formed with a plurality of intake holes (not shown), and the holding surface 43a can generate an adsorption force by the intake air from each intake hole. Therefore, each holding surface 43a adsorbs and holds the downstream end 3ae of the continuous film 3a or the cut-out film 3 generated by cutting the downstream end 3ae in a surface contact state.

  On the other hand, a reception position Pin for receiving the continuous film 3a sent from the suction belt conveyor 35 is set at a predetermined position Pin on the circulation track Tr43. Therefore, when each holding pad 43 passes through this receiving position Pin, each holding pad 43 sucks and holds the continuous film 3a.

  Details are as follows. First, the continuous film 3a is sent to the receiving position Pin along the substantially tangential direction of the orbital track Tr43. When each portion of the holding surface 43a of the holding pad 43 sequentially passes through the receiving position Pin, the portion passing through the receiving position Pin sequentially sucks and holds the opposing continuous film 3a portion, Thereby, after passing the receiving position Pin, the continuous film 3a is hold | maintained in a surface contact state substantially immovably over the substantially full length from the downstream edge part of the holding surface 43a to an upstream edge part. Then, next, since the holding pad 43 adjacent to the upstream side of the holding pad 43 passes through the receiving position Pin, the continuous film 3a is sucked and held through the same process as described above.

  Here, the rotation speed value V43 (corresponding to the second speed value) of the holding pad 43 when passing through the receiving position Pin is larger than the rotation speed value V36 of the endless belt 36 of the suction belt conveyor 35 described above. Is set. Therefore, the continuous film 3a is re-stretched while passing between the suction belt conveyor 35 and the holding pad 43 due to the difference between the circulation speed values V36 and V43. In this re-extended state, the surface is brought into surface contact with the holding surface 43a of the holding pad 43 and is sucked and held.

  Further, the ratio of the circumferential speed value V43 of the holding pad 43 to the circumferential speed value V21 of the upstream roll 21 over the entire time from when the holding pad 43 starts to pass through the receiving position Pin until it finishes passing (= V43 / V21). ) Is constant so that the rotation speed value V43 of the holding pad 43 is adjusted. Therefore, the continuous film 3a is re-stretched in a constant stretched state at a constant stretch ratio M3 over the entire length of the holding surface 43a. Further, even if the peripheral speed value V21 of the upstream roll 21 changes in conjunction with the transport speed value V3a of the continuous film 3a sent from the upper process to the manufacturing apparatus 10, the re-extension process S3 The stretched state is kept constant, that is, kept at a constant stretch magnification M3.

  Further, the circumferential speed value V43 of the holding pad 43 is set to a value smaller than the circumferential speed value V23 of the downstream roll 23 subjected to the stretch development step S1. Therefore, the extended state in the re-extension step S3 is smaller than the extended state in the stretchable expression step S1. And as above-mentioned, the expansion / contraction specification (design specification) of the back sheet 1 can be stored in the range of the expansion / contraction specification of the cut sheet film 3 itself cut and generated from the continuous film 3a as described above. In addition, it is possible to effectively avoid a situation in which the expansion / contraction specification of the back sheet 1 is limited due to the expansion / contraction specification factor of the cut sheet film 3 itself.

  The above-described contents will be described with specific numerical examples as follows. First, when the circumferential speed value V21 of the upstream roll 21 in the stretch development step S1 is the reference value V1, the circumferential speed value V23 of the downstream roll 23 was set to 2.6 × V1. . Therefore, the magnification M1 of the stretched state in the stretchable expression step S1 with respect to the unstretched state was 2.6 (= 2.6V1 / V1) times. On the other hand, the rotation speed value V43 of the holding pad 43 at the time of the above-described re-extension is set to, for example, 1.9 × V1, and thereby the magnification M3 of the extension state in the re-extension step S3 with respect to the non-extension state is 1.9 (= 1.9 V1 / V1). Therefore, the stretched state in the re-stretching step S3 is smaller than the stretched state in the stretchable expression step S1 by the difference between the stretch magnification M1 and the stretch magnification M3. As a result, the continuous film The expansion / contraction specifications (design specifications) of the back sheet 1 are accommodated within the range of the expansion / contraction specifications of the cut film 3 itself cut and generated from 3a.

  However, the expansion ratio M3 of the re-extension step S3 is not limited to the above-mentioned 1.9 times, and as long as the condition that the expansion ratio M1 of the stretchable expression step S1 is smaller than the above-described expansion ratio M1 is 1.5, for example. You may set to the arbitrary value selected from the range of 2 times-4.5 times.

  By the way, the holding pad 43 that has passed the receiving position Pin in this way reaches the installation position P51 of the cutter roll 51 that is set downstream of the orbital track Tr43. Here, the cutter roll 51 is a roll member having at least one cutter blade 53c (two sheets in the example of FIG. 4) on the outer peripheral surface. And it is comprised so that it may drive-rotate in conjunction with the circular movement of the holding pad 43 around the rotation axis C51 along the CD direction, that is, one cutter every time the holding pad 43 passes through the same position P51. The blade 53c rotates so as to pass through the same position P51. Further, the receiving blade 43 c that receives the cutter blade 53 c is provided at the upstream end of each holding pad 43 of the rotary drum device 41.

  Therefore, when the holding pad 43 passes the installation position P51 of the cutter roll 51, the continuous film 3a is formed by the receiving blade 43c provided at the upstream end of the holding pad 43 and the cutter blade 53c of the cutter roll 51. The sheet-like film 3 is generated on the holding pad 43 by sandwiching and cutting. Here, at the time of such cutting, the continuous film 3 is sucked and held on the holding surface 43a of the holding pad 43 in a re-stretched state. Therefore, the cut film 3 cut and generated on the holding surface 43a is also maintained in the re-stretched state by the adsorption force of the holding surface 43a.

  Then, the holding pad 43 moves further on the orbiting track Tr43 further downstream, but at the predetermined position Pout on the downstream side, the sheet-like film 3 of the holding pad 43 is delivered to the continuous web 2a related to the exterior sheet 2. A position Pout is set. That is, the traveling route of the continuous web 2a is a route that passes through the delivery position Pout and is set to a route that is substantially parallel to the tangential direction at the delivery position Pout of the orbital track Tr43. Further, a press roll 61 is also provided at the same position Pout so as to oppose the circular track Tr43.

  Therefore, when the holding pad 43 passes the delivery position Pout, the continuous web 2a is pressed against the single-cut film 3 of the holding pad 43 by the press roll 61. Coupled with the adhesive action of the applied adhesive, the sheet-like film 3 is joined to the continuous web 2a and transported integrally with the continuous web 2a.

  Incidentally, the adhesive is a hot-melt adhesive, and the adhesive application device 38 is disposed at a position downstream of the guide device 33 in the transport route between the downstream roll 23 and the suction belt conveyor 35. Has been. Examples of the application method include a non-contact method such as spraying and a contact method such as a roll coater. In the example of FIG. 4, the latter contact method is employed to achieve more reliable application. That is, a roll coater 38 is used as the adhesive application device 38. However, in some cases, a slot coater (a device that applies an adhesive by discharging adhesive from a wide slit-like opening in the CD direction of the nozzle while bringing the nozzle at the tip close to (substantially in contact with) the application target) may be used. . Incidentally, if the position P38 at which the adhesive is applied to the continuous film 3a in the transport route is set between the downstream roll 23 and the suction belt conveyor 35 as described above, the continuous film 3a is applied after the adhesive is applied. Since the film is re-extended and accompanied by a slight necking at the time of the re-extension, the effect of reducing the dry edge (the unapplied portion of the adhesive generated at the end in the CD direction) by this amount of necking can be expected.

  As shown in FIG. 4, the alignment pitch of the holding pads 43, 43... On the orbiting track Tr43 is determined in advance in association with each position of the orbiting track Tr43. For example, in the predetermined range including the receiving position Pin described above, the holding pad 43 circulates in a state where the intervals between the holding pads 43 adjacent to each other before and after the circular trajectory Tr43 are substantially clogged, but at the delivery position Pout, the same interval. Is configured to circulate in a state in which it is greatly expanded.

  As a result, in a predetermined range including the receiving position Pin, each holding pad 43 can receive the continuous film 3a with substantially no gap between the holding film 43 and the adjacent holding pad 43, but the delivery position Pout. Then, the sheet-like film 3 cut and generated by the cutter roll 51 can be delivered to the continuous web 2a with a large gap between the sheet-like film 3 of the adjacent holding pad 43. Yes. In addition, the magnitude | size of the space | interval of the holding pads 43 and 43 in this delivery position Pout is set corresponding to the above-mentioned sticking pitch P3 (FIG. 2B) of the sheet-like film 3.

  Further, the rotational speed value V43 of the holding pad 43 at the delivery position Pout is set to a speed value substantially the same as the traveling speed value V2a of the continuous web 2a. And thereby, generation | occurrence | production of the wrinkle of the sheet-like film 3 in the delivery position Pout is suppressed. Incidentally, the running speed value V2a of the continuous web 2a is set to a speed value that is faster than the circumferential speed value V43 of the holding pad 43 at the receiving position Pin. The sheet-like film 3 is attached to the continuous web 2a at an attachment pitch P3 with a gap between the sheet-like film 3 and the sheet-like film 3.

  Thus, the revolving operation of revolving the holding pad 43 while changing the alignment pitch and the revolving speed value V43 of the holding pad 43 according to each position of the revolving trajectory Tr43 is realized by a known driving mechanism. For example, the driving mechanism includes a rotating drum 42 that rotates around the central axis C41, and a cam mechanism that reciprocates each holding pad 43 with respect to the rotating drum 42 over a predetermined range in a direction along the circular trajectory Tr43. Drive mechanism (not shown). Then, the reciprocating operation is combined with the rotating operation of the rotating drum 42, thereby realizing the rotating operation of the holding pad 43 while changing the alignment pitch and the rotating speed value V43.

  Further, the intake operation of the intake holes of the holding pad 43 is also realized by a known mechanism. For example, an intake chamber (not shown) is defined inside each holding pad 43, and each intake chamber communicates with a negative pressure chamber inside the rotary drum 42 via an appropriate flow path (not shown). Then, intake is performed using the negative pressure chamber as a negative pressure source.

  By the way, desirably, as shown in the example of FIG. 4, the downstream roller 37 b included in the suction belt conveyor 35 in the re-extension step S <b> 3 is made to be more than the upstream roll 21 and the downstream roll 23 in the stretch development step S <b> 1. The diameter may be small, and in this way, necking of the continuous film 3a at the time of re-extension can be more effectively suppressed. Details are as follows.

  First, if the roller 37b on the downstream side of the suction belt conveyor 35 is reduced in diameter, the downstream end portion 35b of the suction belt conveyor 35 can be easily placed close to the holding pad 43 passing through the receiving position Pin on the rotary drum device 41. Become. And if it arranges adjacently, the span length between the suction belt conveyor 35 and the holding pad 43 at the time of re-extension can be set to a short span, and as a result, necking of the continuous film 3a at the time of re-extension can be suppressed. Can do.

  Incidentally, the reason why the roller 37b on the downstream side of the suction belt conveyor 35 can be made smaller in diameter than the upstream roll 21 and the downstream roll 23 is as follows. As described above with reference to the graph of tensile load P-elongation characteristics in FIG. 3, when a continuous film that does not exhibit stretchability is stretched for the first time, it is the same unless a large tensile load is applied as shown by the solid line in FIG. The film 3a does not stretch. For this reason, it is necessary to apply a large tensile load at the time of expansion in the stretch development step S1, and for this purpose, a large reaction force from the outer rolls 21a and 23a of the upstream roll 21 and the downstream roll 23 is generated as a reaction force of the tensile load. A static friction force must be ensured, and a large-diameter roll is required to ensure the static friction force. However, since the stretchability has already been developed at the second and subsequent stretches, the continuous film 3a is stretched with a remarkably small tensile load, as indicated by the dotted line in FIG. Therefore, it is sufficient that the static frictional force of the outer peripheral surface 37b to be the reaction force of the tensile load is relatively small, and as a result, the roller 37b on the downstream side of the suction belt conveyor 35 can cope with a small diameter.

=== Second Embodiment ===
FIG. 5 is an explanatory view of the method for manufacturing the composite of continuous sheets according to the second embodiment, and is a schematic side view of the manufacturing apparatus 10a.

  The main difference from the first embodiment is that a transport roller 39 is additionally provided between the suction belt conveyor 35 and the rotary drum device 41 in the re-extension step S3, and the continuous film 3a is formed on the outer peripheral surface 39a of the transport roller 39. It is in the point wound by the predetermined | prescribed winding angle, and a structure other than this is the same as 1st Embodiment in general. Therefore, below, this difference is mainly demonstrated, the code | symbol same about the structure similar to 1st Embodiment is attached | subjected, and the description is abbreviate | omitted.

  The additionally provided transport roller 39 (corresponding to a roller) is a roller that can rotate around the rotation axis C39 along the CD direction. And in this example, the said roller 39 is comprised as a driven roller which obtains a rotational force from the continuous film 3a contact | abutted to the outer peripheral surface 39a, and rotates around.

  Further, as shown in FIG. 5, the installation position of the transport roller 39 is set between the downstream roller 37b of the suction belt conveyor 35 and the orbital track Tr43 with respect to the orbiting radial direction Dr43 of the holding pad 43. On the other hand, the direction along the circular track Tr43 is set at a position farther upstream from the receiving position Pin than the roller 37b. And thereby, the continuous film 3a is hung on both the roller 37b and the conveyance roller 39 by S shape. That is, the continuous film 3a delivered from the suction belt conveyor 35 reaches the holding pad 43 at the receiving position Pin via the transport roller 39, but the transport route at that time is S-shaped.

  According to this configuration, the transport route from the suction belt conveyor 35 to the holding pad 43 at the receiving position Pin is divided into two by the transport roller 39. That is, the spanning portion is divided into two parts, a portion from the suction belt conveyor 35 to the transport roller 39 and a portion from the transport roller 39 to the holding pad 43, and each span is the length of each spanning portion. The transfer length is shorter than the transfer length from the suction belt conveyor 35 to the holding pad 43 in the first embodiment of FIG. Therefore, in the second embodiment, necking on the transport route from the suction belt conveyor 35 to the holding pad 43 can be more effectively suppressed.

  Desirably, the outer peripheral surface 39a of the transport roller 39 is also subjected to a non-slip treatment, and one example thereof is that the outermost layer of the transport roller 39 is formed of a rubber layer.

  Moreover, in this example, since it is difficult to apply | coat the adhesive agent for joining to the direction of the continuous film 3a, the said adhesive agent is apply | coated to the direction of the continuous web 2a which concerns on the exterior sheet | seat 2. FIG. That is, an adhesive application device 38a is installed at a position upstream of the press roll 61 in the travel path of the continuous web 2a, and the single-sheet film 3 is placed on the continuous web 2a by the adhesive application device 38a. Adhesive is applied to the part to be placed. In this case, since the adhesive must be intermittently applied, spraying by spraying is employed as a non-contact type.

  By the way, in this 2nd Embodiment, although only the one conveyance roller 39 was added, it is not restricted to this at all. In other words, if the apparatus layout or the like permits, a plurality of transport rollers 39 may be additionally provided, thereby repeating the S-shaped wrapping to form a substantially spirally folded transport route. In this case, since the transport route from the suction belt conveyor 35 to the holding pad 43 is divided into three or more, and the span of each span can be further shortened, necking is more effectively suppressed. It becomes possible.

=== Third Embodiment ===
FIG. 6 is an explanatory view of the manufacturing method of the composite of continuous sheets according to the third embodiment, and is a schematic side view of the manufacturing apparatus 10b.

  The main difference from the first embodiment is that the relaxation conveyance step S2 and the re-extension step S3 set in the conveyance path from the downstream roll 23 to the holding pad 43 of the rotary drum device 41 are omitted. is there.

  That is, in the third embodiment, the cutting step S4 is performed next to the stretch development step S1, and then the joining step S5 is performed. Such a change mainly includes the circumferential speed value V36 related to the suction belt conveyor 35 with respect to the circumferential speed value V23 of the downstream roll 23 and the circumferential speed value V43 of the holding pad 43 of the rotary drum device 41 according to the first embodiment. It is realized by making it different from the case of. That is, the apparatus configuration is substantially the same as that of the first embodiment, but the above-described process is omitted by changing the rotation speed values V36, V43 and the like. Therefore, the other contents are generally the same as those in the first embodiment. In the following, this difference will be mainly described, and the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof will be omitted. To do.

  As shown in FIG. 6, first, when the peripheral speed value V21 of the upstream roll 21 is set to the reference value V1, the peripheral speed value V23 of the downstream roll 23 is set to 2 × V1. Thereby, in the stretchable expression step S1, the continuous film 3a is stretched at a stretch ratio M1 of 2 times (= 2 × V1 / V1), and stretchability is exhibited.

  Next, the circumferential speed value V36 (corresponding to the third speed value) of the endless belt 36 relating to the suction belt conveyor 35 (corresponding to the third rotating member) is set to approximately 2 × V1, and the rotating drum device The rotational speed value V43 (corresponding to the fourth speed value) at the receiving position Pin of the 41 holding pads 43 is also set to approximately 2 × V1. That is, both the circumferential speed value V36 and the circumferential speed value V43 are maintained at substantially the same speed value as the circumferential speed value V23.

  Therefore, the continuous film 3a is conveyed to the holding pad 43 while the stretched state in the stretchable expression step S1 is generally maintained, and is sucked and held on the holding pad 43 in the stretched state. Then, when the holding pad 43 passes the installation position P51 of the cutter roll 51 along the circular track Tr43, the continuous film 3a of the holding pad 43 is cut into the single-cut film 3 in the above-described stretched state. Then, when the holding pad 43 passes through the delivery position Pout on the track Tr43, the sheet-like film 3 is delivered from the holding pad 43 to the continuous web 2a related to the exterior sheet 2 in the above-described extended state. The intermediate part 1a is manufactured.

And according to such 3rd Embodiment, the continuous film 3a is the peripheral speed value V23 of the downstream roll 23 of elastic | stretch expression process S1 on the conveyance path | route between the downstream roll 23 and the rotating drum apparatus 41. Is transported at approximately the same speed value. Therefore, the continuous film 3a is conveyed in the said conveyance path | route in a short time, and, as a result, productivity of the intermediate component 1a can be improved.
By the way, the meaning of “both of the peripheral speed values V36 and V43 are maintained at substantially the same speed value as the peripheral speed value V23” described above means that “the peripheral speed values V36 and V43 are equal to or higher than the peripheral speed value V23”. “It is 1.1 times or less of the peripheral speed value V23” and “the peripheral speed values V36 and V43 are 0.9 times or more of the peripheral speed value V23 and below the peripheral speed value V23”. Including.

  Moreover, according to said 3rd Embodiment, the continuous film 3a is the rotation drum from the downstream roll 23, maintaining the expansion | extension state which concerns at least the expansion / contraction specification of a product, ie, the expansion | extension state required for the expansion / contraction specification of the back sheet 1. It is conveyed to the holding pad 43 of the device 41. That is, in the conveyance path, the stretched state of the continuous film 3a is kept at the stretched state when the cut sheet film 3 is bonded to the continuous web 2a related to the exterior sheet 2 at least. Therefore, it is not necessary to re-extend the continuous film 3a for the purpose of ensuring the expansion and contraction specifications of the back sheet 1 before joining to the continuous web 2a, and as a result, necking that may occur at the time of such re-extension can be suppressed. .

  However, from the viewpoint of omitting re-extension, the extended state of the continuous film 3a is maintained at least in the extended state necessary for the expansion / contraction specifications of the back sheet 1 over the conveyance path from the downstream roll 23 to the holding pad 43. It is enough. Therefore, the above-mentioned condition “both the circumferential speed values V36 and V43 are maintained at substantially the same speed value as the circumferential speed value V23” is not necessarily essential. In other words, the peripheral speed values V36 and V43 may be smaller than the peripheral speed value V23 of the downstream roll 23 as long as the stretched state necessary for the expansion and contraction specifications of the back surface sheet 1 is maintained in the transport path. For example, when the peripheral speed value V21 of the upstream roll 21 is set to the reference value V1, and the peripheral speed value V23 of the downstream roll 23 is set to 2 × V1, the peripheral speed value V43 of the holding pad 43 is set to 1.8 ×. While setting to V1, the circumferential speed value V36 of the endless belt 36 of the suction belt conveyor 35 may be set to a speed value between 1.8 × V1 and 2 × V1. If the circumferential speed value V43 is set lower than the circumferential speed value V23 in this way, the expansion / contraction specification (elongation magnification 1.8 times) of the back sheet 1 that is generally the expansion / contraction specification of the diaper is obtained. The elastic property can be surely accommodated in a range where the elastic property is good (extension ratio is 2 times), and the elastic property of the diaper is improved.

  Moreover, in the case of this 3rd Embodiment, the application of the suction belt conveyor 35 is a thing which presses down drooping of the continuous film 3a from a conveyance path | route from the downward direction, and is not an application like the case of 1st Embodiment. . That is, it is not a kind of application in which the relaxation transport process S2 and the re-extension process S3 are made by transporting the continuous film 3a firmly at substantially the same speed value as the rotation speed value 36. Therefore, the suction and holding of the continuous film 3a on the outer peripheral surface of the endless belt 36 is not essential. Therefore, instead of the suction belt conveyor, a normal belt conveyor that does not have an intake hole may be used. good.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, the present invention can be changed or improved without departing from the gist thereof, and needless to say, the present invention includes equivalents thereof. For example, the following modifications are possible.

  In the above-described embodiment, the single-cut film 3 is exemplified as the single-cut sheet 3, and further, a laminate film having a three-layer structure is shown as an example of the single-cut film 3; If it has a resin film and these are joined and integrated, it will not be restricted to any three layers. For example, a two-layer structure of an extensible resin film and a stretchable resin film may be used, or the number of layers may be larger than that of a three-layer structure. Further, the cut sheet 3 may be a laminate sheet in which a nonwoven fabric having an extensible resin fiber and a nonwoven fabric having a stretchable resin fiber are joined and integrated. The number of layers may be larger than the layer structure. Furthermore, a laminate sheet in which a nonwoven fabric having stretchable resin fibers and a stretchable resin film are joined and integrated may be used. Conversely, a nonwoven fabric having stretchable resin fibers and a stretchable resin film are joined and integrated. A laminate sheet may be used. Moreover, it may not be a laminate sheet, that is, it may be a single layer nonwoven fabric in which a plurality of extensible resin fibers and a plurality of stretchable resin fibers are mixed. And if such a single sheet 3 is stretched at a predetermined magnification in a predetermined direction only once, the stretch of the stretched direction is expressed in the single sheet 3 and thereafter, It can be used as the elastic sheet 3 for absorbent articles such as the disposable diaper 1.

  Examples of such extensible resins include olefin resins such as polyethylene (PE) or polypropylene (PP), and examples of stretchable resins include styrene-isoprene-butadiene copolymers and SBS copolymers. SIBS copolymer and the like can be mentioned, but not limited thereto.

  In the above-described embodiment, the disposable diaper is illustrated as an example of the absorbent article. However, the absorbent article is not limited to this as long as the article absorbs the excretion fluid of the wearer. For example, the absorbent article is a sanitary napkin. May be.

  In the first and second embodiments described above, the suction belt conveyor 35 is illustrated as the first rotating member, and the rotating drum device 41 is illustrated as the second rotating member. However, the continuous film 3a is substantially relative to the surface contact state. The rotating member is not limited to this as long as the rotating member can be driven and rotated while being kept immovable. For example, as the first rotating member and the third rotating member, a driving roll formed by winding the continuous film 3a at a predetermined winding angle may be applied. Similarly, the second rotating member may be applied at a predetermined winding angle. You may apply the drive roll formed by winding a continuous film.

  In the third embodiment described above, the belt conveyor 35 is exemplified as the third rotating member. However, the rotating member is not limited to this as long as the rotating member can be driven and rotated while suppressing the drooping of the continuous film 3a from the conveyance path from below. Absent. For example, a drive roll that comes into contact with the continuous film 3a from below may be applied as the third rotating member.

1 back sheet, 1a intermediate part (composite of continuous sheets),
2 exterior sheet, 2a continuous web (second continuous sheet),
3 Single cut film (elastic film, single cut sheet),
3Ld lower layer, 3Lm intermediate layer, 3Lu upper layer,
3a continuous film (first continuous sheet), 3ae downstream end,
10 manufacturing equipment, 10a manufacturing equipment, 10b manufacturing equipment,
21 upstream roll, 21a outer peripheral surface,
23 downstream roll, 23a outer peripheral surface,
25 pressing roller, 27 pressing roller,
31 transport roller, 31a outer peripheral surface,
33 guide device, 33s edge sensor,
34a guide roller, 34b guide roller,
35 Suction belt conveyor (first rotating member, third rotating member),
36 endless belt, 36a outer peripheral surface, 37a roller, 37b roller,
38 adhesive application device, 38a adhesive application device,
39 Conveying roller (roller), 39a outer peripheral surface,
41 rotating drum device (second rotating member), 42 rotating drum,
43 holding pad, 43a holding surface, 43c receiving blade,
51 cutter roll, 53c cutter blade,
61 press rolls,
S1 elasticity expression process, S2 relaxation conveyance process, S3 re-extension process,
S4 cutting process, S5 joining process,
G1 clearance C21 rotation axis, C25 rotation axis, C31 rotation axis, C33 predetermined axis,
C37a rotation axis, C37b rotation axis, C39 rotation axis, C41 axis,
P38 installation position, P41 vicinity position, P51 installation position,
Pin receiving position, Pout delivery position,
Tr43 orbit,

Claims (11)

A stretchable cut sheet is produced by cutting from the first continuous sheet that develops stretchability in the continuous direction by being stretched in the continuous direction, and the cut sheet is formed on the second continuous sheet. A method of producing a composite of continuous sheets by overlapping and joining,
The upstream roll and the downstream roll rotating around the first continuous sheet in an S-shape along the continuous direction of the first continuous sheet on the upstream roll and the downstream roll rotating with the outer peripheral surfaces facing each other. By making a difference in the peripheral speed value with the downstream roll, the first continuous sheet is stretched in the continuous direction at a predetermined magnification, and the first continuous sheet is made stretchable,
Cutting the first continuous sheet exhibiting stretchability in a stretched state to produce the cut sheet in a stretched state;
Bonding the generated sheet-like sheet in the stretched state to the second continuous sheet, a method for producing a composite of a continuous sheet according to an absorbent article. It is a manufacturing method of the composite of the continuous sheet concerning the absorptive article according to claim 1,
Between expressing the stretchability in the first continuous sheet and generating the cut sheet,
Stretching the first continuous sheet by causing the first continuous sheet exhibiting elasticity to abut on and hold a first rotating member that rotates at a first speed value smaller than the peripheral speed value of the downstream roll. Conveying between the downstream roll and the first rotating member while relaxing,
The first continuous sheet is held in contact with a second rotating member that rotates at a second speed value that is greater than the first speed value of the first rotating member and less than the peripheral speed value of the downstream roll. Re-stretching the first continuous sheet to a stretched state smaller than the stretched state at the predetermined magnification,
In producing the cut sheet, the first continuous sheet in the re-stretched state is cut to produce the cut sheet in the stretched state. A method for producing a composite. It is a manufacturing method of the composite of the continuous sheet concerning the absorptive article according to claim 2,
The second rotating member has a holding member that moves along the continuous direction at the second speed value that is larger than the first speed value of the first rotating member and smaller than the peripheral speed value of the downstream roll. And
In the re-extension, the holding member moves at the second speed value while the first continuous sheet conveyed from the first rotating member is sucked and held by the holding member. Re-extend the sheet,
In generating the cut sheet, by cutting the first continuous sheet sucked and held by the holding member in the re-stretched state while maintaining the re-stretched state on the holding member, Create a cut sheet,
In joining to the second continuous sheet, the sheet-like sheet that moves integrally with the holding member while being held in the re-extended state by the holding member is moved along the moving direction of the holding member. The continuous sheet composite according to the absorbent article, wherein the sheet-like sheet in the re-stretched state is delivered from the holding member to the second continuous sheet by joining to the second continuous sheet being conveyed. Body manufacturing method. It is a manufacturing method of the composite of the continuous sheet concerning the absorptive article according to claim 2 or 3,
At least one roller is disposed between the first rotating member and the second rotating member, and the first continuous sheet is wound around the outer peripheral surface of the roller at a predetermined winding angle. A method for producing a composite of continuous sheets according to an absorbent article. It is a manufacturing method of the composite of the continuous sheet which concerns on the absorbent article in any one of Claims 1 thru | or 4, Comprising:
An absorbent article, wherein a pressing roller that presses a portion of the first continuous sheet wound around the outer peripheral surface of the upstream roll against the outer peripheral surface is provided to face the outer peripheral surface. A method for producing such a composite of continuous sheets. It is a manufacturing method of the composite of the continuous sheet which concerns on the absorbent article in any one of Claims 1 thru | or 5, Comprising:
The upstream roll and the downstream roll are arranged close to each other so that the size of the gap between the upstream roll and the downstream roll is larger than the thickness of the first continuous sheet and equal to or less than 10 mm. A method for producing a composite of continuous sheets according to an absorbent article. It is a manufacturing method of the composite of the continuous sheet concerning the absorptive article according to claim 2 or 3,
The first rotating member includes a pair of rotating rollers, and an endless belt that is wound around the pair of rollers and sucks and holds the first continuous sheet on an outer peripheral surface,
The downstream roller of the pair of rollers has a smaller diameter than the upstream roll and the downstream roll, and the continuous sheet composite manufacturing method according to the absorbent article. It is a manufacturing method of the composite of the continuous sheet concerning the absorptive article according to claim 2 or 3,
In conveying between the downstream roll and the first rotating member, the guide device provided between the downstream roll and the first rotating member allows the direction related to the direction intersecting the continuous direction. The manufacturing method of the composite of the continuous sheet which concerns on the absorbent article characterized by the shift | offset | difference of the running position of a 1st continuous sheet being suppressed. It is a manufacturing method of the composite of the continuous sheet concerning the absorptive article according to claim 1,
The stretched state of the first continuous sheet extends at least the second sheet between the second continuous sheet and the generation of the single sheet. A method for producing a composite of continuous sheets according to an absorbent article, wherein the sheet-like sheet is kept in an expanded state when bonded to a continuous sheet. It is a manufacturing method of the composite of the continuous sheet concerning the absorptive article according to claim 9,
Between expressing the stretchability in the first continuous sheet and generating the cut sheet,
By bringing the first continuous sheet exhibiting stretchability into contact with a third rotating member that rotates at a third speed value of 0.9 times or more and 1.1 times or less of the peripheral speed value of the downstream roll. And conveying the first continuous sheet from the downstream roll to the third rotating member,
Generating the cut sheet is
The first continuous sheet fed from the third rotating member is moved along the continuous direction at a fourth speed value that is 0.9 to 1.1 times the peripheral speed value of the downstream roll. Adsorbing and holding by a holding member;
Generating the sheet-like sheet by cutting the first continuous sheet adsorbed and held by the holding member in the extended state while maintaining the extended state on the holding member;
In joining to the second continuous sheet,
By joining the sheet-like sheet that moves integrally with the holding member while being held in the extended state by the holding member, to the second continuous sheet that is conveyed along the moving direction of the holding member. The method for producing a composite of continuous sheets according to an absorbent article, wherein the sheet-like sheet in the stretched state is delivered from the holding member to the second continuous sheet. A stretchable cut sheet is produced by cutting from the first continuous sheet that develops stretchability in the continuous direction by being stretched in the continuous direction, and the cut sheet is formed on the second continuous sheet. An apparatus for producing a composite of continuous sheets by overlapping and joining,
The upstream roll and the downstream roll rotating around the first continuous sheet in an S-shape along the continuous direction of the first continuous sheet on the upstream roll and the downstream roll rotating with the outer peripheral surfaces facing each other. A stretchable expression device that stretches the first continuous sheet in the continuous direction at a predetermined magnification and expresses stretchability in the first continuous sheet by making a difference in peripheral speed value with the downstream roll,
A cutting device for cutting the first continuous sheet exhibiting stretchability in a stretched state to generate the cut sheet in the stretched state;
An apparatus for manufacturing a composite of continuous sheets according to an absorbent article, comprising: a joining device that joins the generated sheet-like sheet in the stretched state to the second continuous sheet.

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