JP5779737B1 - Absorbent article manufacturing method and manufacturing apparatus - Google Patents

Abstract

Preparing an abdomen side cutter unit (50U) and a dorsal side cutter unit (60U) having a cutter rotator and an anvil rotator rotating opposite each other's outer peripheral surfaces, and continuing in a predetermined direction When a continuous sheet that is continuous in a predetermined direction to which the elastic member for the abdominal side is fixed passes through the abdominal side cutter unit (50U) with the predetermined direction as the conveying direction, the abdominal side cutter unit (50U) ) Cuts the elastic member in a region corresponding to the low expansion / contraction region of the abdominal side of the continuous sheet, thereby forming a low expansion / contraction region of the abdominal side and elasticity for the back side continuous in a predetermined direction. When the continuous sheet that is continuous in a predetermined direction to which the member is fixed passes through the back side cutter unit (60U) with the predetermined direction as the conveying direction, the back side cutter unit (60U) is continuous. By cutting the elastic member in a region corresponding to the low-stretch region of the back side in the over bets, has forming a low-stretch region of the back side, a.

Description

  The present invention relates to a method for manufacturing an absorbent article such as a disposable diaper, and a manufacturing apparatus.

  Conventionally, disposable diapers are known as absorbent articles that absorb excrement such as urine. The diaper generally has an abdominal part, a crotch part, and a dorsal part, and the abdominal part and the dorsal part are respectively a high stretch region and a low stretch region that is less stretchable than the high stretch region. And have.

JP 2010-240112 A

  As shown in the perspective view of FIG. 1, in this diaper production line, one wide continuous sheet 20s' is generally conveyed as a material for the abdomen and the back. Further, the wide continuous sheet 20s ′ includes abdominal elastic members 27as ′, 27as ′,... Continuous in the conveying direction, and back elastic members 27bs ′, 27bs ′, which are also continuous in the conveying direction. Are fixed side by side in the CD direction that extends in the same transport direction and intersects the transport direction. Then, when the wide continuous sheet 20s ′ passes through the single cutter unit 50U ′ of the production line, the unit 50U ′ moves into the low expansion / contraction region ALa ′ on the stomach side of the wide continuous sheet 20s ′. In the region ALb1 ′ corresponding to the corresponding region ALa1 ′ and the low expansion / contraction region ALb ′ of the dorsal side, the abdomen elastic member 27as ′ and the dorsal elastic member 27bs ′ are respectively cut to widen The low stretch region ALa ′ on the ventral side and the low stretch region ALb ′ on the back side are formed on the continuous sheet 20s ′.

  Then, the wide continuous sheet 20s ′ is passed through a slitter device 40 ′ located downstream of the cutter unit 50U ′ and divided into two in the CD direction, whereby the abdominal continuum 20as ′ and the back side Part continuum 20bs ′ is generated side by side in the CD direction. Then, the absorbent main body 10 'as the crotch part is stretched over and fixed to these two continuous bodies 20as' and 20bs ', thereby generating a substantially ladder-like continuous body 1s'. The ladder-like continuous body 1s ′ is sequentially subjected to a bi-folding process (not shown), a side seal process, a cutting process at a product pitch, and the like, so that a disposable diaper is finally completed.

  Here, the above-described single cutter unit 50U ′ has, for example, one cutter rotating body 51u ′ such as a cutter roll and an anvil rotating body 51d ′ such as an anvil roll that rotate with their outer peripheral surfaces facing each other. doing. A plurality of cutter blades Ca ′ for cutting the belly side elastic member 27as ′ are provided in a predetermined pattern on the outer peripheral surface of the cutter rotating body 51u ′. A plurality of cutter blades Cb ′ for cutting the side elastic members 27bs ′ are provided in a predetermined pattern.

  However, in this case, both the former cutter blade Ca ′ and the latter cutter blade Cb ′ are provided on the same cutter rotating body 51u ′, so that vibrations at the time of cutting are opposed to each other. There is a risk of affecting the cutting. This can lead to problems such as poor cutting performance and a shortened lifetime.

  The present invention has been made in view of the above-described conventional problems, and the purpose of the present invention is to generate each vibration generated when cutting the elastic member for the ventral part and the elastic member for the dorsal part. It is to prevent each other from affecting the other party's disconnection.

The main invention for achieving the above object is:
An absorptive article which has an abdominal side part and a back side part, and the abdominal side part and the back side part respectively have a high expansion / contraction area and a low expansion / contraction area lower in elasticity than the high expansion / contraction area. A manufacturing method of
Preparing an abdominal side cutter unit having a cutter rotating body and an anvil rotating body rotating opposite each other's outer peripheral surfaces;
Preparing a cutter unit for the back side having a cutter rotating body and an anvil rotating body that rotate opposite each other's outer peripheral surfaces separately from the ventral side cutter unit;
When the continuous sheet continuous in the predetermined direction, to which the elastic member for the ventral part continuous in the predetermined direction is fixed, passes through the ventral part cutter unit with the predetermined direction as the transport direction, the ventral part A cutter unit for cutting the elastic member in a region corresponding to the low expansion / contraction region of the belly side portion of the continuous sheet, thereby forming the low expansion / contraction region of the belly side portion;
When the continuous sheet continuous in the predetermined direction to which the elastic member for the back side continuous in the predetermined direction is fixed passes through the cutter unit for the back side with the predetermined direction as the transport direction, the back side parts cutter unit is closed by cutting the elastic member in a region corresponding to the low-stretch region of the back side of the continuous sheet, and forming the low-stretch region of the back side, the And
The elastic member is provided at a plurality of positions in the CD direction intersecting the transport direction in the region corresponding to the low expansion / contraction region of the ventral side and the region corresponding to the low expansion / contraction region of the back side. ,
Of the low stretch region of the ventral side and the low stretch region of the dorsal side, the region where the number of positions where the elastic member is cut is the first region, and the region with the smaller number is the first region. In case of 2 areas,
Of the abdomen side cutter unit and the dorsal side cutter unit, the first cutter unit in charge of the first region is more in the transport direction than the second cutter unit in charge of the second region. Is located downstream of the
At a position downstream of the first cutter unit in the transport direction, the absorbent main body that absorbs liquid is fixed over the low expansion / contraction region of the belly side and the low expansion / contraction region of the back side. It is the manufacturing method of the absorbent article characterized by doing.

Also,
An absorptive article which has an abdominal side part and a back side part, and the abdominal side part and the back side part respectively have a high expansion / contraction area and a low expansion / contraction area lower in elasticity than the high expansion / contraction area. Manufacturing equipment,
It has a cutter unit for the abdominal side having a cutter rotating body and an anvil rotating body that rotate to face each other's outer peripheral surface,
A backside cutter unit having a cutter rotating body and an anvil rotating body that rotate to face each other's outer peripheral surface separately from the ventral side cutter unit,
When the continuous sheet continuous in the predetermined direction, to which the elastic member for the ventral part continuous in the predetermined direction is fixed, passes through the ventral part cutter unit with the predetermined direction as the transport direction, the ventral part The cutter unit for cutting the elastic member in a region corresponding to the low stretch region of the belly side portion in the continuous sheet, thereby forming the low stretch region of the belly side portion in the continuous sheet,
When the continuous sheet continuous in the predetermined direction to which the elastic member for the back side continuous in the predetermined direction is fixed passes through the cutter unit for the back side with the predetermined direction as the transport direction, the back side The part cutter unit forms the low stretch region of the back side part in the continuous sheet by cutting the elastic member in a region corresponding to the low stretch region of the back side part of the continuous sheet. The manufacturing apparatus of the absorbent article characterized by these.

  Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that each vibration produced when cut | disconnecting the elastic member for ventral parts and the elastic member for dorsal parts mutually influences a partner's cutting | disconnection.

It is a schematic perspective view of the comparative example of the manufacturing method of a diaper. It is a schematic perspective view of the 3 piece type disposable diaper 1 as an example of the absorbent article manufactured with the manufacturing method of this embodiment. It is the schematic plan view which looked at the diaper 1 of the unfolding state from the skin side. It is the schematic plan view which looked at the same diaper 1 from the non-skin side. 5A is a cross-sectional view taken along the line AA in FIG. 3, and FIG. 5B is a cross-sectional view taken along the line BB in FIG. It is VI-VI sectional drawing in FIG. It is the schematic plan view which looked at the ventral belt member 20a from the non-skin side. It is the schematic plan view which looked at the belly side belt member 20a before cutting the rubber thread 27s from the non-skin side. It is a schematic plan view which shows the manufacturing method of the diaper 1 of this embodiment. It is a schematic plan view which shows slit process S40. 11A and 11B are schematic plan views showing the processing contents of the ventral part rubber thread cutting step S50. FIG. 12A is a schematic side view of the ventral portion cutter device 50, and FIG. 12B is a view taken along the line BB in FIG. 12A. It is explanatory drawing of an example of the arrangement pattern of cutter blade C, C ... provided in the cutter block 54 of the cutter roll 51u. 14A and 14B are schematic plan views showing the processing contents of the back side rubber thread cutting step S60. 15A is a schematic side view of the back side cutter device 60, and FIG. 15B is a view taken along the line BB in FIG. 15A. It is a schematic plan view of an example in which the abdomen side cutter unit 50U is arranged on the downstream side in the MD direction from the dorsal side cutter unit 60U. It is a schematic plan view of an example in which two cutter units 50U and 60U are arranged at the same position in the MD direction. It is a schematic plan view for demonstrating the 1st modification of a manufacturing method. It is a schematic plan view for demonstrating the 2nd modification. 20A and 20B are explanatory diagrams of an example in which each thread rubber continuous body 27s is cut at one position PC in the rotation direction Dc51u in the area AL1 corresponding to the non-stretchable area AL.

  At least the following matters will become apparent from the description of the present specification and the accompanying drawings.

An absorptive article which has an abdominal side part and a back side part, and the abdominal side part and the back side part respectively have a high expansion / contraction area and a low expansion / contraction area lower in elasticity than the high expansion / contraction area. A manufacturing method of
Preparing an abdominal side cutter unit having a cutter rotating body and an anvil rotating body rotating opposite each other's outer peripheral surfaces;
Preparing a cutter unit for the back side having a cutter rotating body and an anvil rotating body that rotate opposite each other's outer peripheral surfaces separately from the ventral side cutter unit;
When the continuous sheet continuous in the predetermined direction, to which the elastic member for the ventral part continuous in the predetermined direction is fixed, passes through the ventral part cutter unit with the predetermined direction as the transport direction, the ventral part A cutter unit for cutting the elastic member in a region corresponding to the low expansion / contraction region of the belly side portion of the continuous sheet, thereby forming the low expansion / contraction region of the belly side portion;
When the continuous sheet continuous in the predetermined direction to which the elastic member for the back side continuous in the predetermined direction is fixed passes through the cutter unit for the back side with the predetermined direction as the transport direction, the back side Forming a low expansion / contraction region of the back side portion by cutting the elastic member in a region corresponding to the low expansion / contraction region of the back side portion of the continuous sheet. It is the manufacturing method of the absorbent article characterized by having carried out.

  According to such an absorbent article manufacturing method, a ventral side cutter unit having a cutter rotating body and an anvil rotating body is prepared, and a back side cutter having a cutter rotating body and an anvil rotating body is prepared. The unit is prepared separately from the ventral cutter unit. Then, the abdominal side cutter unit cuts the abdominal side elastic member, and the back side portion cutter unit cuts the back side elastic member. Therefore, a problem that may occur when both the elastic member for the ventral part and the elastic member for the dorsal part are cut with the single cutter unit described above, that is, the elastic member for the ventral part and the dorsal part It is possible to prevent each vibration generated when cutting each of the elastic members from affecting each other's cutting.

A method of manufacturing such an absorbent article,
Transporting in the transport direction by a transport device a wide continuous sheet in which both the elastic member for the ventral side part and the elastic member for the back side part are fixed and continuous in the transport direction;
When the wide continuous sheet passes through the slitter device disposed on the upstream side in the transport direction from both the abdomen side cutter unit and the back side cutter unit, the slitter device is By dividing the continuous sheet in the CD direction intersecting the transport direction, the continuous sheet supplied to the abdomen side cutter unit and the continuous sheet supplied to the back side cutter unit It is desirable to have

  According to such a method for manufacturing an absorbent article, the abdomen side cutter unit and the dorsal side cutter unit perform the cutting process of the elastic member on different continuous sheets. Further, the dimension in the CD direction of each continuous sheet is reduced by the above division. Therefore, the dimension in the CD direction of each of the abdomen side cutter unit and the back side cutter unit can be shortened, whereby each cutter unit can be easily arranged at an arbitrary position. As a result, each cutter unit can be easily arranged at a position where vibration during cutting does not affect each other's cutting.

A method of manufacturing such an absorbent article,
When the continuous sheet passes along the conveyance direction between the cutter rotating body and the anvil rotating body, the cutter blade on the outer peripheral surface of the cutter rotating body and the anvil rotating body are the continuous sheet. And the elastic member, the elastic member is cut,
The cutter rotator and the anvil rotator are each rotatably supported by bearing members at both ends in the CD direction,
In the cutter rotating body, the dimension in the CD direction of the body portion located between the bearing members, and in the anvil rotating body, the dimension in the CD direction of the body portion located between the bearing members. It is desirable that each of the wide continuous sheets is smaller than the dimension in the CD direction.

  According to such a method for manufacturing an absorbent article, it is possible to reduce the dimension in the CD direction of the body portion located between the bearing members for each of the cutter rotating body and the anvil rotating body. Therefore, bending of the cutter rotating body and the anvil rotating body can be suppressed, and as a result, vibration during cutting can be reduced.

A method of manufacturing such an absorbent article,
The abdomen side cutter unit has a drive source for rotating at least one of the cutter rotator and the anvil rotator of the abdomen side cutter unit,
The back side cutter unit has a drive source for rotating at least one of the cutter rotating body and the anvil rotating body of the back side cutter unit separately from the drive source. It is desirable to do.

  According to such a method for manufacturing an absorbent article, the abdomen side cutter unit and the dorsal side cutter unit rotate at least one of the cutter rotator and the anvil rotator, respectively. There are separate drive sources. Therefore, there is a problem when both the abdominal side cutter unit and the back side cutter unit share the same drive source, that is, vibration of one cutter unit is transmitted to the other cutter unit via the drive source. It is possible to effectively prevent transmission.

A method of manufacturing such an absorbent article,
It is desirable that the abdomen side cutter unit and the dorsal side cutter unit are arranged at different positions in the CD direction intersecting the transport direction.

  According to such a manufacturing method of an absorbent article, the abdomen side cutter unit and the back side cutter unit are arranged at different positions in the CD direction. Therefore, it can prevent more reliably that the vibration which arises at the time of the cutting | disconnection of the abdominal part cutter unit and the vibration which arises at the time of the cutting | disconnection of the back side cutter unit mutually influence a cutting | disconnection of a partner.

A method of manufacturing such an absorbent article,
It is desirable that the abdomen side cutter unit and the dorsal side cutter unit are arranged at different positions in the transport direction.

  According to such a method for manufacturing an absorbent article, the abdomen side cutter unit and the dorsal side cutter unit are arranged at different positions in the transport direction. Therefore, it can prevent more reliably that the vibration which arises at the time of the cutting | disconnection of the abdominal part cutter unit and the vibration which arises at the time of the cutting | disconnection of the back side cutter unit mutually influence a cutting | disconnection of an other party.

A method of manufacturing such an absorbent article,
In the region corresponding to the low expansion / contraction region of the ventral side and the region corresponding to the low expansion / contraction region of the back side, the elastic members are provided at a plurality of positions in the CD direction, respectively.
Of the low stretch region of the ventral side and the low stretch region of the dorsal side, the region where the number of positions where the elastic member is cut is the first region, and the region with the smaller number is the first region. In case of 2 areas,
Of the abdomen side cutter unit and the dorsal side cutter unit, the first cutter unit in charge of the first region is more in the transport direction than the second cutter unit in charge of the second region. Is located downstream of the
At a position downstream of the first cutter unit in the transport direction, the absorbent main body that absorbs liquid is fixed over the low expansion / contraction region of the belly side and the low expansion / contraction region of the back side. It is desirable to do.

  According to such a method for manufacturing an absorbent article, the first region tends to greatly extend in the transport direction due to the large number of positions to be cut. The first cutter unit in charge of is disposed on the downstream side in the transport direction with respect to the second cutter unit. Therefore, the absorptive main body can be fixed to the first region before the elongation becomes so large, and thus the absorptive main body can be attached to the first region with high positional accuracy.

A method of manufacturing such an absorbent article,
It is desirable to cut the ventral side cutter unit and the dorsal side cutter unit when the other party does not cut each other.

  According to such a method for manufacturing an absorbent article, it is more reliable that vibration generated when cutting the abdomen side cutter unit and vibration generated when cutting the back side cutter unit influence each other's cutting. Can be prevented.

Also,
An absorptive article which has an abdominal side part and a back side part, and the abdominal side part and the back side part respectively have a high expansion / contraction area and a low expansion / contraction area lower in elasticity than the high expansion / contraction area. Manufacturing equipment,
It has a cutter unit for the abdominal side having a cutter rotating body and an anvil rotating body that rotate to face each other's outer peripheral surface,
A backside cutter unit having a cutter rotating body and an anvil rotating body that rotate to face each other's outer peripheral surface separately from the ventral side cutter unit,
When the continuous sheet continuous in the predetermined direction, to which the elastic member for the ventral part continuous in the predetermined direction is fixed, passes through the ventral part cutter unit with the predetermined direction as the transport direction, the ventral part The cutter unit for cutting the elastic member in a region corresponding to the low stretch region of the belly side portion in the continuous sheet, thereby forming the low stretch region of the belly side portion in the continuous sheet,
When the continuous sheet continuous in the predetermined direction to which the elastic member for the back side continuous in the predetermined direction is fixed passes through the cutter unit for the back side with the predetermined direction as the transport direction, the back side The part cutter unit forms the low stretch region of the back side part in the continuous sheet by cutting the elastic member in a region corresponding to the low stretch region of the back side part of the continuous sheet. The manufacturing apparatus of the absorbent article characterized by these.

  According to such an absorbent article manufacturing apparatus, the same effects as those of the manufacturing method described above can be achieved.

=== This Embodiment ===
The manufacturing method of the absorbent article of this embodiment is implemented by the manufacturing line 30 of the disposable diaper 1 as an example of an absorbent article, for example. FIG. 2 is a schematic perspective view of a three-piece type diaper 1 as an example of the diaper 1. 3 is a schematic plan view of the unfolded diaper 1 as seen from the skin side, and FIG. 4 is a schematic plan view of the diaper 1 as seen from the non-skin side. 5A is a sectional view taken along line AA in FIG. 3, FIG. 5B is a sectional view taken along line BB in FIG. 3, and FIG. 6 is a sectional view taken along line VI-VI in FIG.

  As shown in FIG. 3, FIG. 5A, and FIG. 6, this diaper 1 has a vertical direction, a horizontal direction, and a thickness direction as three directions orthogonal to each other. Moreover, since the diaper 1 is what is called a three-piece type, it has the absorptive main body 10 which is applied to a wearer's crotch part and absorbs excrement, such as urine, as a 1st component, The back side belt member 20a (corresponding to the abdomen side) covering the wearer's torso from the abdominal side, and as the third part, the back side band member 20b (back side) covering the wearer's torso from the back side Part).

  In the deployed state of FIG. 3, the abdominal band member 20a and the dorsal band member 20b are arranged in parallel with a space between each other, while the absorbent main body 10 is stretched between them. End portions 10ea and 10eb in the longitudinal direction of the absorbent main body 10 are bonded and fixed to the nearest belt members 20a and 20b, respectively, and the external shape is substantially H-shaped in plan view. Also, from this state, the diaper 1 is folded in two with the substantially central portion CL10 in the longitudinal direction of the absorbent main body 10 as the folding position, and the belt members 20a, 20b facing each other in the folded state are worn by the wearer. When the portions 20ae and 20be to be brought into contact with the flank are welded and connected at the end portions 20ae and 20be in the lateral direction, the band members 20a and 20b are connected in an annular shape, thereby 2 is a pants-type diaper 1 in which a waist opening 1HB and a pair of leg openings 1HL, 1HL are formed as shown in FIG.

  As shown to FIG. 5B, the absorptive main body 10 has the absorptive core 11, the liquid-permeable surface sheet 13 which covers the same core 11 from the skin side, and makes the skin side surface of the absorptive main body 10, and the said core 11 A liquid-impermeable back sheet 15 that covers the non-skin side and forms the non-skin side surface of the absorbent main body 10. The absorbent core 11 is formed by molding a liquid absorbent material such as pulp fiber or a super absorbent polymer as an example of a liquid absorbent fiber into a predetermined shape such as a substantially hourglass shape in plan view. In the example of FIG. 5B, the core 11 is covered with the liquid-permeable covering sheet 12, but it may not be covered.

  Moreover, as shown in FIG.3 and FIG.5B, the absorptive main body 10 may have the solid gathers LSG and LSG as a leak-proof wall part in each edge part of a horizontal direction in order to prevent a side leak. Furthermore, elastic members 17r such as rubber thread are arranged on both sides of the absorbent main body 10 in the lateral direction, so that it corresponds to the leg openings 1HL and 1HL of the diaper 1 as shown in FIG. Stretchable leg gathers LG, LG may be formed on the portion to be stretched.

  On the other hand, as shown in FIGS. 3 and 4, the abdominal band member 20a and the dorsal band member 20b are respectively sheet-like members having a substantially rectangular shape in plan view that are long in the lateral direction, and as shown in FIGS. It has an outer layer sheet 21 and an inner layer sheet 22 laminated in the thickness direction. The inner layer sheet 22 is located on the skin side in the thickness direction with respect to the outer layer sheet 21. Moreover, both the sheets 21 and 22 are formed with flexible sheets, such as a nonwoven fabric, and the spun bond nonwoven fabric is used in this example. However, the present invention is not limited to this, and another type of non-woven fabric may be used, or a resin film or woven fabric may be used. In this example, a single fiber of polypropylene (PP) is used as a constituent fiber of the nonwoven fabric. However, the present invention is not limited to this, and a single fiber of other thermoplastic resin such as polyethylene (PE) may be used. Furthermore, a composite fiber such as a sheath core structure of PE and PP may be used.

  And the center area | region 20ac and 20bc of the horizontal direction in each strip | belt member 20a and 20b is piled up and joined to the non-skin side surface of each edge part 10ea and 10eb of the vertical direction of the absorptive main body 10. FIG.

  Incidentally, in this example, as shown in FIGS. 5A and 6, the outer layer sheet 21 and the inner layer sheet 22 are separate sheets, but the present invention is not limited to this. In other words, both the outer layer sheet 21 and the inner layer sheet 22 described above may be formed from the single sheet by folding the single sheet into two sheets.

  Further, the belt members 20a and 20b are provided with lateral stretchability so that the belt members 20a and 20b can firmly hold the wearer's torso when the diaper 1 is worn. However, from the viewpoint of suppressing the generation of wrinkles at the position of the absorbent core 11 of the absorbent main body 10 and preventing the deterioration of its liquid absorbency and leakproof properties, as shown in FIG. 4, the band members 20a and 20b In particular, in the regions 20ac and 20bc overlapping the absorbent core 11 of the absorbent main body 10, a non-stretchable region AL having almost no stretchability is formed.

  Hereinafter, this will be described. Here, the basic configuration of the abdominal band member 20a and the back band member 20b is the same. Therefore, in the following description, the ventral side band member 20a will be mainly described, and the back side band member 20b will be described as necessary, and will be basically omitted. For convenience of explanation, as shown in the schematic plan view of FIG. 7, the ventral belt member 20a will be described below by dividing it into two regions AU and AD in the vertical direction. That is, the area AU located on the waistline opening 1HB side in the vertical direction is referred to as “upper area AU”, and the area AD located on the leg circumference opening 1HB side is referred to as “lower area AD”.

  As shown in FIG. 7, the absorbent core 11 of the absorbent main body 10 does not substantially overlap the upper region AU. Therefore, the region AU is given stretchability over the entire length in the lateral direction. In addition, the provision of stretchability is realized by a plurality of thread rubbers 25s, 25s,... Arranged in the horizontal direction in the laterally extended state and fixed in the same area AU in the vertical direction. The thread rubber 25s is fixed to the area AU by, for example, the thread rubber 25s or a hot melt adhesive applied to the area AU. Incidentally, as the fineness of the thread rubber 25s, for example, 400 dtex to 1000 dtex can be exemplified, and as a specific example of the thread rubber 25s, LYCRA (trademark) and the like can be exemplified. This also applies to the rubber thread 27 provided in the lower region AD described later.

  On the other hand, since the absorbent core 11 of the absorbent main body 10 overlaps the central region ADc in the lateral direction of the lower region AD, the central region ADc has a non-stretchable region AL that has almost no lateral stretchability. (Corresponding to a low expansion / contraction region) is formed, and since the absorbent core 11 does not substantially overlap the end side regions ADe, ADe located on both sides of the central region ADc, the end side region ADe , ADe are formed with stretchable areas AH, AH (corresponding to high stretchable areas) having higher stretchability than the non-stretchable area AL.

  Here, the non-stretchable region AL of the central region ADc and the stretchable regions AH, AH of the end regions ADe, ADe are formed as follows. First, as shown in FIG. 8, between the outer layer sheet 21 and the inner layer sheet 22, a plurality of thread rubbers 27s, 27s,... ing. Each thread rubber 27s is fixed to the lower region AD with a hot melt adhesive or the like over substantially the entire length in the lateral direction. However, as shown in FIG. 7, in the area AL1 corresponding to the non-expandable area AL of the central area ADc, the rubber threads 27s, 27s... At a plurality of positions PC, PC. Is cut into thin pieces to form thin pieces (not shown), so that the region AL1 is a non-stretchable region AL that has almost no stretchability. On the other hand, in the region AH1 corresponding to the expansion / contraction region AH of each end side region ADe, the rubber thread 27s is not cut, so that the region AH1 is separated from the elastic region AH having elasticity from the rubber thread 27s. It has become.

  Incidentally, as shown in FIG. 7, a plurality of bullet marks TC, TC,... Remain in the central area ADc with the cut pattern as the thread rubber 27s is cut. In this example, as can be seen with reference to FIG. 4, the cut pattern is different between the abdominal band member 20a and the back band member 20b, but the present invention is not limited to this and may be the same.

  FIG. 9 is an explanatory diagram of a method for manufacturing the diaper 1. This manufacturing method includes a slitting step S40, a ventral side rubber thread cutting step S50, a back side thread rubber cutting step S60, an absorbent main body attaching step S70, a bi-folding step S80, a side sealing step S90, Cutting step S100.

  In the slitting step S40, the wide continuous sheet 20s that is the material of the ventral band member 20a and the back band member 20b is divided into two in the width direction, and the continuum 20as of the ventral band member in which the rubber thread 27s is not cut, The continuous rubber 20s of the back side belt member in which the same rubber thread 27s is not cut is generated. In addition, the continuous body 20as of the abdominal band member in which the thread rubber 27s is not cut is a sheet-like member 20as in which a plurality of abdominal band members 20a, 20a,. Similarly, the back belt member continuous body 20bs is a sheet-like member 20bs formed by connecting a plurality of back belt members 20b, 20b,.

  In the ventral side rubber thread cutting step S50, when the continuous body 20as of the ventral belt member sent from the slitting step S40 passes, the thread rubber 27s is cut into a shape in a region AL1 corresponding to the non-stretchable region AL of the continuous body 20as. Thus, the non-stretchable region AL is formed in the continuum 20as.

  In the back side rubber thread cutting step S60, when the continuous body 20bs of the back side band member sent from the slit process S40 passes, the thread rubber 27s is cut into pieces in the area AL1 corresponding to the non-stretchable area AL in the continuous body 20bs. In this way, the non-stretchable region AL is formed in the continuous body 20bs.

  In the absorbent main body attaching step S70, the single-sheet absorbent main body 10 generated in a separate step (not shown) between the continuous members 20as and 20bs of the respective band members sent from the respective thread rubber cutting steps S60 and S70. , So that a substantially ladder-like diaper continuum 1hs is formed, in which diapers 1h, 1h,.

  In the bi-folding step S80, the substantially ladder-like diaper continuum 1hs is folded in half so that the continuum 20as of the abdominal band member and the continuum 20bs of the back band member overlap vertically.

  In the side sealing step S90, the abdominal belt member continuum 20as and the back belt member continuum 20bs that are vertically stacked in the bi-folding step S80 are placed at positions corresponding to the lateral ends 20ae, 20be of the diaper 1. The side seal portion SS is formed by welding and is fixed in a folded state. As a result, a continuous body 1s of a pant-type diaper is generated in which a plurality of pant-type diapers 1, 1,.

  In the cutting step S100, the pants-type diaper continuum 1s is cut by the side seal portions SS, whereby the pants-type diaper 1 is manufactured.

  Hereinafter, although each process S40-S60 is demonstrated in detail, since it is clear that each process S70-S100 after the absorptive main body attachment process S70 can be suitably implement | achieved by a well-known method, it is further demonstrated here. I do not.

  Further, as shown in FIG. 9, the CD direction and the MD direction that are orthogonal to each other are defined in the manufacturing line 30 that performs this manufacturing method. And the above-mentioned wide continuous sheet 20s, the continuous body 20as of the abdominal band member, and the continuous body 20bs of the back side belt member are aligned in the MD direction while aligning their width direction in parallel with the CD direction. It is transported along. Therefore, the MD direction is also a conveyance direction that is a direction in which the wide continuous sheet 20s, the continuum 20as of the abdominal band member, and the continuum 20bs of the back side band member are conveyed.

  Furthermore, the wide continuous sheet 20s, the continuous body 20as of the abdominal band member, and the continuous body 20bs of the back side belt member are each transported along the MD direction. (Not shown). Examples of the conveying device include a conveying roller that is driven or driven to rotate around a rotation axis along the CD direction, a belt conveyor around which an endless belt looped around a roller along the CD direction, and the like. At 30, any one of the conveying devices is used as required.

<<< Slit Process S40 >>>
As shown in FIG. 10, the aforementioned wide continuous sheet 20s is sent to the slitting step S40 from the upstream step in the MD direction. As described above, the wide continuous sheet 20s includes a continuous body 20as of the ventral band member in which the rubber thread 27s is not cut and a continuous body 20bs of the back band member in which the rubber thread 27s is not cut in the CD direction. It is connected to. That is, the wide continuous sheet 20s includes a plurality of thread rubber continuous bodies 25s, 25s... Between a continuous sheet 21s (corresponding to a continuous sheet) of an outer layer sheet and a continuous sheet 22s (corresponding to a continuous sheet) of an inner layer sheet. And a plurality of thread rubber continuums 27s, 27s,... Are composite sheets in which both continuous sheets 21s, 22s are joined. The plurality of thread rubber continuums 25 s, 25 s... And the plurality of thread rubber continuums 27 s, 27 s... Are arranged side by side in the CD direction while extending along the MD direction and extending along the MD direction. Has been. The one side area A20s1 in the CD direction of the wide continuous sheet 20s corresponds to the abdominal band member continuous body 20as, and the other side area A20s2 corresponds to the back side band member continuous body 20bs. Further, the end region A20s1e and the center region A20s1c in the CD direction in the former one region A20s1 correspond to the upper region AU and the lower region AD of the ventral belt member 20a, respectively, and similarly, the other side of the latter In the region A20s2, the region A20s2e on the end side in the CD direction and the region A20s2c on the center side correspond to the upper region AU and the lower region AD of the back side band member 20b, respectively. Therefore, in the regions A20s1e, A20s2e on each end side in the CD direction, the plurality of thread rubber continuums 25s, 25s... Are fixed with a hot-melt adhesive over substantially the entire length in the MD direction. On the other hand, a plurality of thread rubber continuums 27s, 27s,... Described above are fixed to the central regions A20s1c and A20s2c in the CD direction by a hot melt adhesive over substantially the entire length in the MD direction.

  In this slitting process 40, such a wide continuous sheet 20s is divided into two at the boundary position BL between the one side area A20s1 and the other side area A20s2 in the CD direction. A continuous body 20as of the abdomen band member in a cut state and a continuous body 20bs of a back side band member in which the rubber thread 27s is not cut are generated side by side in the CD direction.

  Such a bisection process can be performed using a known slitter device 40. That is, the apparatus 40 has, for example, a pair of upper and lower disk-shaped rotary blades, and divides the wide continuous sheet 20s into two in the CD direction with the cutting edge of the outer peripheral edge of the rotary blade. 40 is well known. Therefore, further explanation is omitted.

<<< Ventral part thread rubber cutting process S50 >>>
In the ventral part rubber thread cutting step S50, in the region AL1 corresponding to the non-stretchable region AL, as shown in FIG. 11B, in the region AL1 corresponding to the non-stretchable region AL, as shown in FIG. While the rubber continuous body 27s is cut into small pieces, the thread rubber continuous body 27s is not cut in the region AH1 corresponding to the stretchable region AH. As a result, the non-stretchable region AL and the stretchable region AH are formed in the continuum 20as of the ventral band member. Note that the area AL1 corresponding to the non-stretchable area AL appears at the product pitch P1 of the diaper 1 in the MD direction. Therefore, the cutting process in the form of chopped pieces is performed at the product pitch P1 of the diaper 1 with respect to the continuum 20as of the ventral band member.

  This cutting process is performed by the abdomen cutter device 50. 12A is a schematic side view of the device 50, and FIG. 12B is a view taken along the line BB in FIG. 12A.

  As shown in FIG. 12A, the cutter device 50 includes a pair of upper and lower rolls 51u and 51d that rotate around a rotation axis along the CD direction and a rubber rubber continuum 27s, with the outer peripheral surfaces 51ua and 51da facing each other. , 27s... And a housing 55 for receiving a reaction force of cutting acting on the rolls 51u and 51d at the time of cutting, as a ventral side cutter unit 50U.

  The pair of upper and lower rolls 51u and 51d are supported by bearing members 52u and 52d provided in the housing 55, respectively, so that they can rotate around a rotation axis parallel to the CD direction. The bearing member 52d of the lower roll 51d is fixed to the housing 55 so as not to move. The bearing member 52u of the upper roll 51u is fixed by an appropriate actuator 53 such as a hydraulic cylinder or an air cylinder fixed to the housing 55. The upper and lower rolls 51d can be moved up and down in the vertical direction. Therefore, by controlling the actuator 53, the size of the space between the outer peripheral surfaces 51ua and 51da of the pair of upper and lower rolls 51u and 51d and the size of the pressure contact force (N) as the force in the contact / separation direction can be adjusted. It has become.

  Further, each roll 51u, 51d is driven and rotated around the rotation axis by a servo motor (not shown) as a drive source. That is, the rotation is performed with the directions orthogonal to the rotation axis as the rotation directions Dc51u and Dc51d. Therefore, the continuous body 20as of the abdominal belt member fed between the outer peripheral surfaces 51ua and 51da of the pair of upper and lower rolls 51u and 51d passes between the outer peripheral surfaces 51ua and 51da and is sent downstream in the MD direction. It is.

  Here, in this example, the upper roll 51u is a cutter roll (corresponding to a cutter rotating body), and the lower roll 51d is an anvil roll (corresponding to an anvil rotating body). That is, at least one cutter block 54 is provided on the outer peripheral surface 51ua of the upper roll 51u at every angle corresponding to the product pitch P1 of the diaper 1 in the rotation direction Dc51u. Specifically, in this example, as indicated by hatching in FIG. 10A, two cutter blocks 54 and 54 are provided at an angle of 180 ° in the rotation direction Dc51u. Further, each cutter block 54 is formed with a plurality of cutter blades C, C..., And the outer peripheral surface 51da of the lower roll 51d as an anvil roll is smooth to receive the cutter blades C, C. It is considered as a surface. Further, these rolls 51u, 51d are controlled to rotate in conjunction with the conveying operation of the abdominal band member continuous body 20as based on, for example, a synchronization signal, and thereby correspond to the non-stretchable region AL. Each time the area AL1 passes, the cutter roll 51u rotates so that the cutter block 54 faces the area AL1.

  Therefore, each time the area AL1 corresponding to the non-stretchable area AL in FIG. 11A passes between the outer peripheral surfaces 51ua and 51da of the pair of rolls 51u and 51d, the area AL1 is the cutter block 54 of the cutter roll 51u. The cutter blades C, C... And the outer peripheral surface 51da of the anvil roll 51d are clamped. The thread rubber continuums 27s, 27s,... Are cut at the clamped positions PC, whereby the thread rubber 27s in the region AL1 corresponding to the non-stretchable region AL is cut into pieces (not shown). Is done.

  FIG. 13 is an explanatory diagram of an example of an arrangement pattern of the cutter blades C, C... Provided on the cutter block 54 of the cutter roll 51u, and shows the outer peripheral surface 51ua of the roll 51u expanded on a plane. is there. In FIG. 13, thread rubber continuums 27s, 27s,... Are also virtually shown by two-dot chain lines.

  As shown in FIG. 13, the cutter block 54 is provided with a plurality of cutter blades C, C,... Further, these cutter blades C, C... Are provided in an arrangement pattern corresponding to the aforementioned cut pattern. For example, in this example, a plurality of cutter blade rows GC, GC,... Composed of a plurality of cutter blades C, C,... Arranged in the rotation direction Dc51u are arranged in a row in the CD direction. Each thread rubber continuum 27s is associated with at least one row of cutter blades GC. Therefore, each thread rubber continuous body 27s can be cut at a plurality of positions PC, PC... (See FIG. 11B) in the rotation direction Dc51u in the region AL1 corresponding to the non-stretchable region AL. The continuous thread rubber 27s located in the area AL1 can be cut into small pieces. However, the arrangement pattern is not limited to the example of FIG. That is, other arrangement patterns may be applied as long as the rubber thread continuous body 27s can be cut at a plurality of positions PC in the rotational direction Dc51u.

  As shown in FIG. 12B, the cutter roll 51u also has side rings 51SR and 51SR at each end in the CD direction. Each side ring 51SR, 51SR is an annular protrusion that protrudes in an annular shape from the outer peripheral surface 51da of the cutter roll 51u over the entire circumference in the rotation direction Dc51u. The side rings 51SR and 51SR regulate the positional relationship in the rotational radius direction between the cutting edge of the cutter blade C at the time of cutting and the outer peripheral surface 51da of the anvil roll 51d receiving the cutting edge C to be constant. For example, in this example, the blade edge of the cutter blade C is provided so as to be located outward in the rotational radius direction from the outer peripheral surface 51SRa of the side ring 51SR. Therefore, if a pressing force is applied in the contact / separation direction so that the outer peripheral surface 51SRa of the side ring 51SR abuts on the outer peripheral surface 51da of the anvil roll 51d when cutting the continuous thread rubber 27s, the cutter blade C will The continuous body 20as of the side band member can be surely penetrated. Thus, the thread rubber continuous body 27s can be reliably cut. Incidentally, in that case, as shown in FIG. 11B, a through-hole-shaped cutting trace TC is formed in the continuous body 20as of the same band member as the cutting trace.

  However, the present invention is not limited to this, and the above positional relationship may be reversed. That is, the cutting edge of the cutter blade C may be positioned inward in the rotational radius direction from the outer peripheral surface 51SRa of the side ring 51SR as long as the continuous thread rubber 27s can be cut. In this case, in a state where the outer peripheral surface 51SRa of the side ring 51SR is in contact with the outer peripheral surface 51da of the anvil roll 51d, the gap between the cutting edge of the cutter blade C and the outer peripheral surface 51ua of the anvil roll 51d is, for example, 5 μm to 5 μm. It is desirable to form a 15 μm gap. In this way, the continuous sheet 21s of the outer layer sheet and the continuous sheet 22s of the inner layer sheet are bonded to each other without being cut when the continuous thread rubber 27s is cut, based on the gap. As a result, pressure-bonding marks are formed in the continuum 20as of the ventral belt member instead of the through-hole-shaped cutting marks TC.

  In addition, although this side ring 51SR is provided in the cutter roll 51u in this example, it is not restricted to this at all. That is, instead of the cutter roll 51u or in addition to the cutter roll 51u, the anvil roll 51d may be provided. Further, if the positional relationship in the contact / separation direction between the cutter blade C and the outer peripheral surface 51da of the anvil roll 51d can be controlled to be constant by controlling the actuator 53 such as a hydraulic cylinder, the side ring 51SR. Is not necessary. In this case, as the actuator 53, a feed screw mechanism capable of position control using a servo motor as a drive source can also be used.

  Further, in this example, the dimension L51ub in the CD direction of the roll body 51ub located between the bearing members 52u and 52u in the cutter roll 51u and the position between the bearing members 52d and 52d in the anvil roll 51d. The dimension L51db in the CD direction of the roll body portion 51db to be performed is smaller than the dimension L20s in the CD direction of the wide continuous sheet 20s (FIG. 9). As a result, the support span of each roll 51u, 51d is shortened. Is planned. Therefore, the bending of the cutter roll 51u and the anvil roll 51d can be suppressed, and as a result, vibration during cutting can be reduced. Incidentally, the same applies to the back side cutter device 60 described later.

<<<< Back side thread rubber cutting step S60 >>>>
As shown in FIG. 9, in the back side thread rubber cutting step S60, as shown in FIG. 14B, in the non-stretchable region AL with respect to the continuous body 20bs of the back side band member of FIG. 14A sent from the slit step S40. In the corresponding region AL1, the thread rubber continuum 27s is cut into small pieces, and in the region AH1 corresponding to the stretchable region AH, the thread rubber continuum 27s is not cut. As a result, the non-stretchable region AL and the stretchable region AH are formed in the continuous body 20bs of the back side band member. Note that the area AL1 corresponding to the non-stretchable area AL appears at the product pitch P1 of the diaper 1 in the MD direction. Therefore, such a cutting process is performed at the product pitch P1 of the diaper with respect to the continuous body 20bs of the back band member.

  This cutting process is performed by a dorsal side cutter device 60 provided separately from the abdominal side cutter device 50 described above. FIG. 15A is a schematic side view of the apparatus 60, and FIG. 15B is a view taken along arrow BB in FIG. 15A.

  As shown in FIG. 15A, the cutter device 60 includes a pair of upper and lower rolls 61u and 61d that rotate around a rotation axis along the CD direction, with the outer peripheral surfaces 61ua and 61da facing each other, and a continuous rubber thread 27s. , 27s... And a housing 65 for receiving a reaction force of cutting acting on these two rolls 61u and 61d at the time of cutting at 27s. In this cutter device 60, the upper roll 61u is a cutter roll (corresponding to a cutter rotating body), and the lower roll 61d is an anvil roll (corresponding to an anvil rotating body). The cutter roll 61u has a cutter block 64, and the cutter block 64 has a plurality of cutter blades C, C,... In an arrangement pattern corresponding to the cut pattern of the non-stretchable region AL related to the continuous body 20bs of the back side band member. Is provided. In addition to the above-described members, the back-side cutter device 60 includes bearing members 62u and 62u of the cutter roll 61u, bearing members 62d and 62d of the anvil roll 61d, and an actuator that moves the cutter roll 61u up and down in the contact / separation direction. 63, side rings 61SR, 61SR, etc., but these members are basically the same as the configuration of the same name described in the abdominal side cutter device 50, and the description thereof is omitted. .

  In this way, if the dorsal side cutter unit 60U is provided separately from the ventral side cutter unit 50U, in the ventral side cutter unit 50U, the rubber thread relating to the continuum 20as of the ventral side belt member can be obtained. While cutting the continuous body 27s (corresponding to the elastic member for the abdomen), the rubber thread continuous body 27s (the elastic member for the back part) according to the continuous body 20bs of the back band member in the back side cutter unit 60U. Is equivalent). Therefore, the problem described at the beginning of this specification can be prevented. That is, “when a single cutter unit 50U ′ as shown in FIG. 1 cuts both the rubber thread continuum 27as ′ for the abdominal band member and the thread rubber continuum 27bs ′ for the back band member, It is possible to prevent the problem that “vibrations that sometimes occur affect each other's disconnection”.

  Further, in this example, as described above, the back side cutter unit 60U uses a servo motor (not shown) as a drive source for rotating the rolls 61u and 61d, and each roll 51u of the ventral side cutter unit 50U. , 51d is provided separately from the servo motor that rotates. Therefore, a problem that may occur when both the abdominal cutter unit 50U and the dorsal cutter unit 60U share the same servomotor, that is, the servomotor or its driving rotational force is assigned to each roll 51u, It is possible to effectively prevent the vibration of one cutter unit 50U (60U) from being transmitted to the other cutter unit 60U (50U) via an appropriate distribution mechanism that distributes to 51d, 61u, and 61d.

  Incidentally, in this example, transmission of the driving rotational force from the driving rotational shaft of the servo motor to the cutter roll 61u is made through a known winding transmission mechanism (not shown) having a pulley and a timing belt, In addition, transmission of the driving rotational force from the cutter roll 61u to the anvil roll 61d is performed via another winding transmission mechanism (not shown), but the driving rotational force is transmitted from the servo motor to each of the rolls 61u and 61d. If possible, it is not limited to this. For example, the driving rotational force may be transmitted using a gear train formed by meshing a plurality of gears, or a servo motor may be provided for each of the rolls 61u and 61d. Furthermore, only the cutter roll 61u may be driven and rotated by a servo motor, and the anvil roll 61d may be a driven rotating roll that is driven by the driving roll force obtained from the cutter roll 61u via the side ring 61SR. This also applies to the abdominal side cutter device 50 described above.

  Furthermore, as shown in plan view in FIG. 9, in this example, the back side cutter unit 60U and the ventral side cutter unit 50U are provided at different positions with respect to the MD direction and the CD direction. More precisely, the MD direction is arranged at a different position when viewed in a plan view. Therefore, it can prevent more reliably that the vibration which arises at the time of the cutting | disconnection of the abdominal part cutter unit 50U and the vibration which arises at the time of the cutting | disconnection of the back side cutter unit 60U mutually influences the other party's cutting | disconnection.

  Further, in this example, as can be seen with reference to FIG. 9, in the MD direction, the back side cutter unit 60 </ b> U is disposed downstream of the abdominal side cutter unit 50 </ b> U. Depending on the case, it may be preferable to reverse the arrangement relationship in the MD direction.

  FIG. 16 is an explanatory diagram showing the plan view. That is, in this example, in the MD direction, the abdomen side cutter unit 50U is arranged on the downstream side of the back side cutter unit 60U. And according to this arrangement, in the subsequent absorbent main body attaching step S70, the abdominal belt member continuous body 20as can be attached to the absorbent main body 10 with higher positional accuracy, thereby As a whole, the dimensional accuracy of the disposable diaper 1 can be increased. Details are as follows.

  First, in this example, as can be seen from the comparison between FIG. 11B and FIG. 14B, the number of positions PC, PC... Where the rubber thread continuum 27s is cut in the non-stretchable region AL is the continuum 20as of the ventral belt member. Is more than the continuous body 20bs of the back side band member. On the other hand, when the number of cut positions PC, PC... Is larger, the belt member continuums 20as, 20bs tend to extend in the MD direction. From this, in this example, the ventral belt member The non-stretchable area AL (corresponding to the first area) of the continuum 20as may extend more in the MD direction than the non-stretchable area AL (corresponding to the second area) of the continuum 20bs of the back band member. .

  Therefore, in the example of FIG. 16, the abdomen side cutter unit 50U (corresponding to the first cutter unit) is more downstream in the MD direction than the back side cutter unit 60U (corresponding to the second cutter unit). Thus, the time required from the cutting of the rubber thread continuous body 27s by the abdomen side cutter unit 50U to the absorbent main body attaching step S70 is shortened. And thereby, the absorptive main body 10 can be fixed to the non-stretchable region AL of the continuum 20as of the ventral belt member before the elongation in the non-stretchable region AL is not so large. The absorptive main body 10 can be attached to the continuum 20as of the ventral belt member with high positional accuracy.

  Incidentally, in this example, the number of cut positions PC, PC... Is larger in the continuum 20as of the ventral band member, but if there are more continuations 20bs of the dorsal band member, the MD direction It is better to reverse the arrangement relationship. That is, as shown in FIG. 9, the back side cutter unit 60 </ b> U may be arranged on the downstream side in the MD direction from the abdominal side cutter unit 50 </ b> U.

  Further, the arrangement relationship between the abdomen side cutter unit 50U and the dorsal side cutter unit 60U is not limited to these two examples. That is, as shown in the schematic plan view of FIG. 17, two cutter units 50U and 60U may be arranged at the same position in the MD direction in plan view. In this example, these two units 50U and 60U are provided adjacent to each other in the CD direction, but may be provided adjacent to each other in the vertical direction in some cases. Further, as in the example of FIG. 17, between the abdomen cutter unit 50U and the dorsal cutter unit 60U, the cutter rolls 51u and 61u are coaxial with each other with an appropriate shaft coupling 110 and are not relatively rotatable. Similarly, the anvil rolls 51d and 61d may be connected to each other coaxially and in a relatively non-rotatable manner by an appropriate shaft coupling (not shown). In this case, the servo motor that rotates the rolls 51u and 61u (or 51d and 61d in addition to them) can be shared by the abdomen cutter unit 50U and the dorsal cutter unit 60U. This can reduce the number of parts.

  Furthermore, desirably, the abdomen side cutter unit 50U and the dorsal side cutter unit 60U may be cut when the other party does not cut each other. And if it becomes like this, it can prevent more effectively that the vibration at the time of a cutting | disconnection influences a mutual partner's cutting | disconnection.

  Incidentally, such a cutting timing shifting operation can be performed by adjusting the positions of the two cutter units in the MD direction. For example, the separation distance LD in the MD direction between the abdominal side cutter units shown in FIG. 16 (more specifically, the rotating shaft of the cutter roll 51u of the abdominal side cutter unit 50U and the cutter of the back side cutter unit 60U) The length of the transport path of the continuous body 20as (20bs) between the rotation axis of the roll 61u) and a value half the product pitch (= P1 / 2) from a value that is an integral multiple of the product pitch P1. If the other cutter block 54 (64) is not opposed to the belt member continuous body 20as (20bs), the cutter block 64 (54) of the belt member is continuous with the belt member continuous body 20bs (20as). Thus, the cutting timing shifting operation described above can be realized. However, the value of the separation distance LD is not limited to the value exemplified above. That is, as long as the cutter units 50U and 60U are cut when the other party does not cut each other, the values other than those exemplified above may be used.

  FIG. 18 is a schematic plan view for explaining a first modification of the manufacturing method. In the above-described embodiment, as shown in FIG. 9, the abdominal side rubber thread cutting step S50 and the back side rubber thread cutting step S60 are located downstream of the slit process S40 in the MD direction. This first modification is mainly different from the above-described embodiment in that an abdominal side thread rubber cutting step S50 and a back side thread rubber cutting process S60 are located upstream of the slit process S40. The other points are almost the same as those in the above-described embodiment. Therefore, only this difference will be described below, and description of the same configuration will be omitted.

  In this first modified example, the ventral-side cutter unit 50U and the dorsal-side cutter unit 60U are provided upstream of the slitter device 40 in the MD direction so that the steps S50, S60, S40 as described above are arranged. They are arranged in this order in the MD direction. And thereby, the continuous body 27s (not shown in FIG. 18) of the rubber thread for the ventral belt member 20a is cut by the former cutter unit 50U with respect to the wide continuous sheet 20s before being divided in the CD direction, Next, the thread cutter continuous body 27s (not shown in FIG. 18) for the back belt member 20b is cut by the latter cutter unit 60U, and then the wide continuous sheet 20s is divided into two by the slitter device 40. Thus, a continuum 20as of the ventral band member and a continuum 20bs of the dorsal band member are generated. However, the order of cutting the continuous thread rubber 27s is not limited to the above, and may be reversed.

  It should be noted that the roll body 51ub located between the bearing members 52u, 52u (62u, 62u) in each cutter roll 51u (61u) so that the cutting process of the continuous thread rubber 27s can be performed reliably. (61 ub) CD direction dimension L 51 ub (L 61 ub), and roll body portion located between bearing members 52 d and 52 d (62 d and 62 d) in each anvil roll 51 d (61 d) not shown in FIG. The dimension L51db (L61db) in the CD direction of 51db (61db) is larger than the dimension L20s in the CD direction of the wide continuous sheet 20s. Thus, for each cutter unit 50U (60U), the wide continuous sheet 20s can be quickly passed between the cutter roll 51u (61u) and the anvil roll 51d (61d).

  Incidentally, in this case, naturally, in the abdominal side cutter unit 50U, the thread rubber continuous body 27s is not cut into the area AL1 corresponding to the non-stretchable area AL of the back band member 20b. Similarly, in the back side cutter unit 60U, the thread rubber continuous body 27s is not cut in the area AL1 corresponding to the non-stretchable area AL of the ventral belt member 20a. Will pass through the same area AL1. And when the area AL1 to be passed through passes through each cutter unit 50U (60U), it is desirable that the rolls 51u, 51d (61u, 61d) are not pinched. Therefore, about the cutter roll 51u and the anvil roll 51d of the abdominal-side cutter unit 50U, in the non-stretchable region AL related to the back-side belt member 20b in the outer peripheral surface 51ua (51da) of at least one roll 51u (51d). The part facing the corresponding region AL1 is preferably smaller in diameter than the surrounding part, and the cutter roll 61u and the anvil roll 61d of the back side cutter unit 60U are at least one of the rolls 61u (61d). In the outer peripheral surface 61ua (61da), the portion facing the region AL1 corresponding to the non-stretchable region AL related to the ventral belt member 20a is preferably smaller in diameter than the surrounding portion. This also applies to a second modification described later.

  FIG. 19 is a schematic plan view for explaining a second modification of the manufacturing method. In the first modification described above, the wide continuous sheet 20s before being divided in the CD direction sequentially passes through both the abdomen side cutter unit 50U and the dorsal side cutter unit 60U. On the other hand, in this second modification, both the abdominal band member continuum 20as and the back band member continuum 20bs that are divided into two by the slitter device 40 and are arranged in the CD direction are respectively abdominal cutter units. It is different in that it passes through both the 50U and the back side cutter unit 60U, and the other points are substantially the same as in the first modification.

  That is, in the second modification, between the cutter roll 51u and the anvil roll 51d of the abdominal side cutter unit 50U, both the abdominal band member continuous body 20as and the back side belt member continuous body 20bs are in the CD direction. Are passed along the MD direction, and after that, between the cutter roll 51u and the anvil roll 51d of the abdominal side cutter unit 50U, the continuum of the abdominal band member 20as and the continuum of the back side band member Both 20bs pass along the MD direction in a state of being aligned in the CD direction. And also in this 2nd modification, when the continuous body 20as of the former ventral belt member passes the abdominal part cutter unit 50U, the unit 50U corresponds to the non-stretchable area AL of the continuous body 20as. When the continuous body 20s of the rubber thread is cut by AL1 and the continuous body 20bs of the latter back side belt member passes through the back side cutter unit 60U, the unit 60U becomes a non-stretchable region of the continuous body 20bs. The continuous thread rubber 27s is cut in the area AL1 corresponding to AL.

=== 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, each rubber thread continuum 27s as an elastic member is cut at a plurality of positions PC, PC... In the rotational direction Dc51u in the region AL1 corresponding to the non-stretchable region AL (see, for example, FIG. 11B). As a result, the thread rubber continuous body 27s is cut into pieces in the same area AL1, but the present invention is not limited thereto.

  For example, as shown in FIG. 20A and FIG. 20B, in the region AL1 corresponding to the non-stretchable region AL, each thread rubber continuous body 27s is cut at one position PC in the rotation direction Dc51u, and the cut thread rubber is continuous. The non-stretchable region AL may be formed by contracting the body 27s toward the region AH1 corresponding to the stretchable region AH. In this case, the thread rubber continuum 27s before cutting is a region AL1 corresponding to the non-stretchable region AL so that the cut thread rubber continuum 27s quickly contracts toward the stretchable region AH. Is not bonded with a hot melt adhesive, but is bonded to the region AH1 corresponding to the stretchable region AH with the same adhesive.

  In the embodiment described above, the thread rubber continuous body 27s is exemplified as the elastic member, but the elastic member is not limited thereto. For example, a belt-like elastic member such as a flat rubber continuous body may be used.

  In the above-described embodiment, the cutter rolls 51u and 61u are exemplified as the cutter rotating body, and the anvil rolls 51d and 61d are illustrated as the anvil rotating body. However, the present invention is not limited thereto. For example, an endless belt may be used as each of the cutter rotating body and the anvil rotating body.

  In the above-described embodiment, as an example of the continuous sheet to which the elastic member for the abdomen is fixed or as an example of the continuous sheet to which the elastic member for the back side is fixed, the wide continuous sheet 20s is arranged in the CD direction. The divided continuous sheets 20as and 20bs are shown, and the wide continuous sheet 20s is a sheet having two sheets including an outer layer continuous sheet 21s and an inner layer continuous sheet 22s. It does not have to be a configuration. For example, a single-sheet configuration or three or more configurations may be used.

  In above-mentioned embodiment, although the 3 piece type disposable diaper 1 was illustrated as an example of an absorbent article, it is not restricted to this at all. For example, a continuous rubber thread 27s as an elastic member fixed to a continuous sheet used in a two-piece disposable diaper is cut with the abdomen side cutter device 50 and the back side cutter device 60 described above. May be. By the way, a two-piece type disposable diaper has an outer layer sheet having an abdominal part, a crotch part and a dorsal part as a first part, and has an absorbent main body 10 fixed to the skin side surface of the exterior sheet. It is a type of diaper having as a second part. In that case, the above-described continuous sheet of the exterior sheet corresponds to the above-described “continuous sheet to which the elastic member is fixed”, and the slitting step S40 is not necessary.

  In above-mentioned embodiment, although the underpants type disposable diaper 1 was illustrated as an example of an absorbent article, it is not restricted to this at all. That is, it may be a tape-type disposable diaper. The tape-type disposable diaper has an abdominal side that covers the wearer's torso from the abdomen side and a back side that covers the torso from the back side. It is a type of diaper that uses a fastening tape to connect. Furthermore, the absorbent article is not limited to the disposable diaper 1 described above. That is, the manufacturing method and the manufacturing apparatus of the present invention can be applied to any absorbent article that uses the above-described “continuous sheet with an elastic member fixed” as a material. Therefore, the concept of this absorbent article includes a urine absorbing pad and a sanitary napkin.

DESCRIPTION OF SYMBOLS 1 Disposable diaper, 1hs Ladder-like diaper continuum, 1s pant-type diaper continuum, 1HB waistline opening, 1HL leg-hole opening, 10 absorbent body, 10ea end, 11 absorbent core, 12 covering sheet, 13 Top sheet, 15 back sheet, 17r elastic member, 20a ventral band member, 20ac central region, 20ae end, 20as continuum of ventral band member, 20b dorsal band member, 20bs continuum of dorsal band member, 20s wide continuous sheet , 21 outer layer sheet, 21s outer layer sheet continuous sheet, 22 inner layer sheet, 22s inner layer sheet continuous sheet, 25 thread rubber, 25s thread rubber continuous body, thread rubber 27s thread rubber continuous body (for thread rubber, ventral side part) Elastic member, back side elastic member), 30 production line (manufacturing equipment), 40 slitter device, 50 ventral side cutter equipment , 50U ventral side cutter unit (first cutter unit), 51SR side ring, 51SRa outer peripheral surface, 51u cutter roll (cutter rotating body), 51ua outer peripheral surface, 51ub roll barrel (torso), 51d anvil roll (anvil) Rotating body), 51da outer peripheral surface, 51db roll body (body), 52u bearing member, 52d bearing member, 53 actuator, 54 cutter block, 55 housing, 60 back side cutter device,
60U back side cutter unit (second cutter unit), 61SR side ring,
61u cutter roll (cutter rotating body), 61ua outer peripheral surface, 61d anvil roll (anvil rotating body), 62u bearing member, 62d bearing member, 63 actuator, 64 cutter block, 65 housing, 110 shaft coupling, C cutter blade, GC cutter Blade row, AU upper region, AD lower region, ADc center region, ADe end side region, AH stretch region (high stretch region), AL non-stretch region (low stretch region), AH1 region, AL1 region, A20s1 one side region , A20s1c center area, A20s1e end area, A20s2 other area, A20s2c center area, A20s2e end area, BL boundary position, LSG solid gather, LG leg gather, SS side seal, TC Incision mark, PC position, S40 Slit process, S 0 ventral rubber thread cutting step, S60 dorsal rubber thread cutting step, S70 absorbent body mounting step,
S80 Absorbent body attachment process, S90 side seal process, S100 cutting process

Claims (8)

An absorptive article which has an abdominal side part and a back side part, and the abdominal side part and the back side part respectively have a high expansion / contraction area and a low expansion / contraction area lower in elasticity than the high expansion / contraction area. A manufacturing method of
Preparing an abdominal side cutter unit having a cutter rotating body and an anvil rotating body rotating opposite each other's outer peripheral surfaces;
Preparing a cutter unit for the back side having a cutter rotating body and an anvil rotating body that rotate opposite each other's outer peripheral surfaces separately from the ventral side cutter unit;
When the continuous sheet continuous in the predetermined direction, to which the elastic member for the ventral part continuous in the predetermined direction is fixed, passes through the ventral part cutter unit with the predetermined direction as the transport direction, the ventral part A cutter unit for cutting the elastic member in a region corresponding to the low expansion / contraction region of the belly side portion of the continuous sheet, thereby forming the low expansion / contraction region of the belly side portion;
When the continuous sheet continuous in the predetermined direction to which the elastic member for the back side continuous in the predetermined direction is fixed passes through the cutter unit for the back side with the predetermined direction as the transport direction, the back side parts cutter unit is closed by cutting the elastic member in a region corresponding to the low-stretch region of the back side of the continuous sheet, and forming the low-stretch region of the back side, the And
The elastic member is provided at a plurality of positions in the CD direction intersecting the transport direction in the region corresponding to the low expansion / contraction region of the ventral side and the region corresponding to the low expansion / contraction region of the back side. ,
Of the low stretch region of the ventral side and the low stretch region of the dorsal side, the region where the number of positions where the elastic member is cut is the first region, and the region with the smaller number is the first region. In case of 2 areas,
Of the abdomen side cutter unit and the dorsal side cutter unit, the first cutter unit in charge of the first region is more in the transport direction than the second cutter unit in charge of the second region. Is located downstream of the
At a position downstream of the first cutter unit in the transport direction, the absorbent main body that absorbs liquid is fixed over the low expansion / contraction region of the belly side and the low expansion / contraction region of the back side. A method for producing an absorbent article. It is a manufacturing method of the absorptive article according to claim 1,
Transporting in the transport direction by a transport device a wide continuous sheet in which both the elastic member for the ventral side part and the elastic member for the back side part are fixed and continuous in the transport direction;
When the wide continuous sheet passes through the slitter device disposed on the upstream side in the transport direction from both the abdomen side cutter unit and the back side cutter unit, the slitter device is By dividing the continuous sheet in the CD direction intersecting the transport direction, the continuous sheet supplied to the abdomen side cutter unit and the continuous sheet supplied to the back side cutter unit And producing the absorbent article. It is a manufacturing method of the absorptive article according to claim 2,
When the continuous sheet passes along the conveyance direction between the cutter rotating body and the anvil rotating body, the cutter blade on the outer peripheral surface of the cutter rotating body and the anvil rotating body are the continuous sheet. And the elastic member, the elastic member is cut,
The cutter rotator and the anvil rotator are each rotatably supported by bearing members at both ends in the CD direction,
In the cutter rotating body, the dimension in the CD direction of the body portion located between the bearing members, and in the anvil rotating body, the dimension in the CD direction of the body portion located between the bearing members. The method for producing an absorbent article, wherein each of the wide continuous sheets is smaller than a dimension in the CD direction. A method for producing an absorbent article according to any one of claims 1 to 3,
The abdomen side cutter unit has a drive source for rotating at least one of the cutter rotator and the anvil rotator of the abdomen side cutter unit,
The back side cutter unit has a drive source for rotating at least one of the cutter rotating body and the anvil rotating body of the back side cutter unit separately from the drive source. A method for producing an absorbent article. It is a manufacturing method of an absorptive article in any one of Claims 1 thru / or 4,
The method for producing an absorbent article, wherein the abdomen side cutter unit and the back side cutter unit are arranged at different positions in the CD direction intersecting the transport direction. A method for manufacturing an absorbent article according to any one of claims 1 to 5,
The method for manufacturing an absorbent article, wherein the abdomen side cutter unit and the back side cutter unit are arranged at different positions in the transport direction. A method for producing an absorbent article according to any one of claims 1 to 6 ,
The method for producing an absorbent article, wherein the abdomen side cutter unit and the dorsal side cutter unit are cut when each other does not cut each other. An absorptive article which has an abdominal side part and a back side part, and the abdominal side part and the back side part respectively have a high expansion / contraction area and a low expansion / contraction area lower in elasticity than the high expansion / contraction area. Manufacturing equipment,
It has a cutter unit for the abdominal side having a cutter rotating body and an anvil rotating body that rotate to face each other's outer peripheral surface,
A backside cutter unit having a cutter rotating body and an anvil rotating body that rotate to face each other's outer peripheral surface separately from the ventral side cutter unit,
When the continuous sheet continuous in the predetermined direction, to which the elastic member for the ventral part continuous in the predetermined direction is fixed, passes through the ventral part cutter unit with the predetermined direction as the transport direction, the ventral part The cutter unit for cutting the elastic member in a region corresponding to the low stretch region of the belly side portion in the continuous sheet, thereby forming the low stretch region of the belly side portion in the continuous sheet,
When the continuous sheet continuous in the predetermined direction to which the elastic member for the back side continuous in the predetermined direction is fixed passes through the cutter unit for the back side with the predetermined direction as the transport direction, the back side The part cutter unit forms the low stretch region of the back side part in the continuous sheet by cutting the elastic member in a region corresponding to the low stretch region of the back side part of the continuous sheet ,
The elastic member is provided at a plurality of positions in the CD direction intersecting the transport direction in the region corresponding to the low expansion / contraction region of the ventral side and the region corresponding to the low expansion / contraction region of the back side. ,
Of the low stretch region of the ventral side and the low stretch region of the dorsal side, the region where the number of positions where the elastic member is cut is the first region, and the region with the smaller number is the first region. In case of 2 areas,
Of the abdomen side cutter unit and the dorsal side cutter unit, the first cutter unit in charge of the first region is more in the transport direction than the second cutter unit in charge of the second region. Is located downstream of the
At a position downstream of the first cutter unit in the transport direction, the absorbent main body that absorbs liquid is fixed over the low expansion / contraction region of the belly side and the low expansion / contraction region of the back side. An apparatus for manufacturing an absorbent article.

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