JP5779738B1 - Manufacturing method and manufacturing apparatus for sheet-like member according to absorbent article - Google Patents

Abstract

Conveying a composite sheet fixed with a thermoplastic adhesive in the conveying direction while an elastic member is interposed between the first thermoplastic continuous sheet and the second thermoplastic continuous sheet; Forming a high stretch region and a low stretch region on the composite sheet side by side in the transport direction by cutting the elastic member in at least one location in the transport direction in a region corresponding to the stretch region. In forming, the heating member is a rotating body such that the temperature of at least one of the rotating body of the cutter and the rotating body of the anvil rotating opposite to each other is less than the melting point of the adhesive. When the composite sheet passes along the conveying direction between the cutter rotator and the anvil rotator, the cutter blade and the anvil rotator on the outer peripheral surface of the cutter rotator By clamping, the elastic member is cut while forming a pressure-bonding portion between the first continuous sheet and the second continuous sheet at the clamped position in the composite sheet.

Description

  The present invention relates to a method for manufacturing a sheet-like member and an apparatus for manufacturing absorbent articles such as disposable diapers.

  Conventionally, in the manufacture of disposable diapers known as absorbent articles that absorb excretory fluids such as urine, a high stretch region and a low stretch region that is less stretchable in a predetermined direction than the high stretch region are arranged in a predetermined direction. The sheet-like member which has is used.

  Such a sheet-like member 20s' is generated as follows. FIG. 1 is a schematic view showing the generation process in a plan view.

  First, as shown in FIG. 1, the composite sheet 20s1 'as the material of the sheet-like member 20s' is conveyed in the MD direction. Here, the composite sheet 20s1 ′ is made of rubber thread as an elastic member continuous in the MD direction between the first continuous sheet 21s ′ continuous in the MD direction and the second continuous sheet 22s ′ continuous in the MD direction. The continuous bodies 27s ′, 27s ′,... Are inserted in the MD direction in an expanded state. Further, the continuous bodies 27s ', 27s', ... of the rubber thread are fixed to the continuous sheets 21s ', 22s' intermittently in the MD direction. That is, the continuous thread 27s ′, 27s ′... Of the same thread rubber is fixed with a hot melt adhesive as an example of a thermoplastic adhesive in the region AH1 ′ corresponding to the high stretch region AH ′. The region AL1 ′ corresponding to the low expansion / contraction region AL ′ is not fixed.

  When the composite sheet 20s1 ′ passes through the cutter device 50 ′, a low expansion / contraction region in the composite sheet 20s1 ′ is formed by a cutter blade (not shown) and an anvil roll (not shown) of the cutter roll of the device 50 ′. The region AL1 ′ corresponding to AL ′ is clamped, and thereby the rubber thread continuums 27s ′, 27s ′,... Are cut at a single PC in the MD direction. Then, the cut rubber threads 27sd ′, 27sd ′... Shrink toward the regions AH1 ′, AH1 ′ corresponding to the high stretch regions AH ′, AH ′, respectively. The stretchable area AH ′ and the low stretchable area AL ′ are formed side by side in the MD direction. With the above, the sheet-like member 20s' is generated.

Special table 2014-511753

  Here, from the viewpoint of suppressing damage to the sheet-like member 20s ′, only the thread rubber continuums 27s ′, 27s ′,... It is desirable that the two continuous sheets 21s ′ and 22s ′ are not cut as much as possible. In such a case, the first continuous sheet 21s ′ and the second continuous sheet 21 are located at the sandwiched position PC1. A crimping portion j with the sheet 22s ′ is formed.

  However, Patent Document 1 does not disclose the formation of the crimping portion j at the same position PC1.

  Further, Patent Document 1 does not disclose a measure for suppressing breakage of the continuous thread rubber 27s'. Here, as one of the measures, heating the cutter roll or the anvil roll promotes softening of the thermoplastic first and second continuous sheets 21s ′ and 22s ′ at the time of clamping, and thereby the above-described sandwiching is performed. It is conceivable to make it easy to apply a pinching force, which is a force at the time of pressure, to the thread rubber continuum 27 ′.

  However, if these rolls are heated too much, a large amount of heat can enter the composite sheet 20s1 ′ from the roll when the composite sheet 20s1 ′ passing through the apparatus comes into contact with the roll. The hot melt adhesive in the sheet 20s1 ′ is melted. Then, the adhesive adheres to and accumulates on the roll with the fluidity of the molten state, and the deposition proceeds and the adhering material becomes a large lump, and then drops onto the composite sheet 20s1 ′. Then, the part of the composite sheet 20s1 ′ in which the deposit is wound is a defective product. Therefore, a technique that can suppress the adhesion of the adhesive to the roll has been awaited.

  The present invention has been made in view of the conventional problems as described above, and the object thereof is to cut the elastic member such as a continuous thread rubber in the composite sheet, while the thermoplastic sheet Thermoplastic adhesion from the composite sheet to the cutter rotating body or anvil rotating body while suppressing the breakage of the elastic member when forming the crimping portion between the one continuous sheet and the thermoplastic second continuous sheet It is to prevent the adhesion of the agent effectively.

The main invention for achieving the above object is:
A method for producing a sheet-like member having a high stretch region and a low stretch region having lower stretchability in a predetermined direction than the high stretch region, arranged in the predetermined direction,
Between the first thermoplastic continuous sheet that continues in the predetermined direction and the second thermoplastic continuous sheet that continues in the predetermined direction, an elastic member that extends in the predetermined direction and is continuous in the predetermined direction is interposed. A composite sheet fixed with a thermoplastic adhesive at least in a region corresponding to the high stretch region while being inserted, and transporting the predetermined direction as a transport direction;
Forming the high stretch region and the low stretch region side by side in the transport direction on the composite sheet by cutting the elastic member in at least one place in the transport direction in a region corresponding to the low stretch region; Have
In the forming, the heating member is arranged such that the temperature of at least one of the rotating body of the cutter and the rotating body of the anvil rotating to face each other is less than the melting point of the adhesive. While the rotating body is heated, when the composite sheet passes along the transport direction between the cutter rotating body and the anvil rotating body, a cutter blade on the outer peripheral surface of the cutter rotating body; The elastic member is formed by forming a pressure-bonding portion between the first continuous sheet and the second continuous sheet at a position where the composite sheet is pressed by the anvil rotating body sandwiching the composite sheet. Cut and
The rotating body heated by the heating member rotates around a rotation axis along a CD direction intersecting the transport direction,
The method for manufacturing a sheet-like member according to an absorbent article , wherein the heating member heats the rotating body with a predetermined heating pattern so that a temperature difference in the CD direction in the rotating body is small .

Also,
An apparatus for manufacturing a sheet-like member having a high stretch region and a low stretch region having lower stretchability in a predetermined direction than the high stretch region, arranged in the predetermined direction,
Between the first continuous sheet that continues in the predetermined direction and the second continuous sheet that continues in the predetermined direction, an elastic member that extends in the predetermined direction and is inserted in the predetermined direction is inserted, at least A transport device that transports the composite sheet fixed with the thermoplastic adhesive in the region corresponding to the high stretch region, with the predetermined direction as the transport direction;
A cutter device that forms the high stretchable region and the low stretchable region side by side in the transport direction on the composite sheet by cutting the elastic member in at least one place in the transport direction in a region corresponding to the low stretchable region. And having
The cutter device is configured such that the temperature of at least one of the rotating body of the cutter and the anvil rotating body rotating with the outer peripheral surfaces facing each other, and the rotating body of the cutter and the anvil rotating body is a melting point of the adhesive. A heating member for heating the rotating body so as to be less than
When the composite sheet passes along the transport direction between the cutter rotator and the anvil rotator, the cutter blade on the outer peripheral surface of the cutter rotator and the anvil rotator pass the composite sheet. By clamping, the elastic member is cut while forming a pressure-bonding portion between the first continuous sheet and the second continuous sheet at a position where the composite sheet is pressed .
The rotating body heated by the heating member rotates around a rotation axis along a CD direction intersecting the transport direction,
The heating member is an apparatus for manufacturing a sheet-like member according to an absorbent article , wherein the heating member heats the rotating body with a predetermined heating pattern so that a temperature difference in the CD direction in the rotating body becomes small .

  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, when the elastic member such as the thread rubber continuous body is cut in the composite sheet, the pressure-bonding portion between the thermoplastic first continuous sheet and the thermoplastic second continuous sheet is formed at the same position. In addition, it is possible to effectively prevent adhesion of the thermoplastic adhesive from the composite sheet to the cutter rotating body or the anvil rotating body while enabling the elastic member to be cut off.

FIG. 6 is a schematic plan view showing a process of generating a sheet-like member 20s ′ having a high stretch region AH ′ and a low stretch region AL ′. 1 is a schematic perspective view of a three-piece disposable diaper 1 as an example of an absorbent article according to the present 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. FIG. 9A is a schematic plan view of the sheet-like member 20as immediately before being conveyed to the manufacturing apparatus 30 of the present embodiment, and FIG. 9B shows that the expansion areas AH and AH and the non-expandable area AL are formed by the manufacturing apparatus 30. It is a schematic plan view of the formed sheet-like member 20as. FIG. 10A is a schematic side view of the manufacturing apparatus 30, and FIG. 10B is a BB arrow view in FIG. 10A. It is explanatory drawing of the arrangement | positioning state of cutter blade C provided in the cutter block 54 of the cutter roll 51d, Comprising: It is a figure which expand | deploys and shows the outer peripheral surface 51da of the roll 51d on the plane. It is a general | schematic expanded side view which shows the clearance gap G formed between the blade edge | tip of the cutter blade C, and the outer peripheral surface 51ua of the anvil roll 51u. FIG. 13A is a schematic longitudinal sectional view of a cutter roll 51d and an anvil roll 51u for explaining the heating mechanism, and FIG. 13B is a sectional view taken along line BB in FIG. 13A. FIG. 14A is a schematic side view showing a state in which the hot melt adhesive is applied to the continuous thread rubber 27s, and FIG. 14B is a view taken along the line BB in FIG. 14A. It is a schematic side view which shows a mode that the sheet-like member 20as was wound around the cutter roll 51d. 16A and 16B are explanatory diagrams of an example in which each thread rubber continuous body 27s is cut at a plurality of positions PC, PC... In the rotational direction Dc51d 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.

A method for producing a sheet-like member having a high stretch region and a low stretch region having lower stretchability in a predetermined direction than the high stretch region, arranged in the predetermined direction,
Between the first thermoplastic continuous sheet that continues in the predetermined direction and the second thermoplastic continuous sheet that continues in the predetermined direction, an elastic member that extends in the predetermined direction and is continuous in the predetermined direction is interposed. A composite sheet fixed with a thermoplastic adhesive at least in a region corresponding to the high stretch region while being inserted, and transporting the predetermined direction as a transport direction;
Forming the high stretch region and the low stretch region side by side in the transport direction on the composite sheet by cutting the elastic member in at least one place in the transport direction in a region corresponding to the low stretch region; Have
In the forming, the heating member is arranged such that the temperature of at least one of the rotating body of the cutter and the rotating body of the anvil rotating to face each other is less than the melting point of the adhesive. While the rotating body is heated, when the composite sheet passes along the transport direction between the cutter rotating body and the anvil rotating body, a cutter blade on the outer peripheral surface of the cutter rotating body; The elastic member is formed by forming a pressure-bonding portion between the first continuous sheet and the second continuous sheet at a position where the composite sheet is pressed by the anvil rotating body sandwiching the composite sheet. It is a manufacturing method of the sheet-like member concerning an absorptive article characterized by cutting.

  According to the method for manufacturing a sheet-like member related to such an absorbent article, the heating member is set so that the temperature of at least one of the cutter rotating body and the anvil rotating body is lower than the melting point of the adhesive. Is heating the rotating body. Therefore, the softening of the thermoplastic first and second continuous sheets can be promoted based on the heating, and the pinching force, which is the force at the time of pinching, can be easily applied to the continuous thread rubber. It becomes possible to suppress the cutting of the member.

  In addition, according to the rotating body whose heating is limited to a temperature lower than the melting point as described above, the hot melt adhesive in the composite sheet is generally melted due to heat input through contact between the rotating body and the composite sheet. Is prevented. Therefore, adhesion of the adhesive from the composite sheet to the rotating body can be effectively prevented.

A method for producing a sheet-like member according to such an absorbent article,
It is desirable to apply the adhesive to the elastic member.

  According to the method for manufacturing a sheet-like member according to such an absorbent article, the adhesive is applied to the elastic member. Therefore, the elastic member can be fixed in a relatively small amount as compared with the case where the first and second continuous sheets are applied. That is, the amount of adhesive remaining on the composite sheet without contributing to fixing of the elastic member can be greatly reduced. As a result, it is possible to suppress the lowering of the composite sheet that may occur when the amount of application is excessive, and it is easy to ensure the softness of the composite sheet.

A method for producing a sheet-like member according to such an absorbent article,
The rotating body heated by the heating member is preferably the cutter rotating body.

  According to the manufacturing method of the sheet-like member related to such an absorbent article, the heat of the heat is quickly transmitted also to the cutter blade, so that the heat is first and second continuous at the position where it contacts the cutter blade. The softening of the sheet can be effectively promoted. And thereby, it can make it easy to apply said clamping pressure to an elastic member in the same position, As a result, the cutting property of an elastic member can be improved. In addition, since the temperature of the cutter blade is also lower than the melting point, it is possible to suppress the melting of the adhesive, thereby preventing the cutter blade from being attached to the cutter blade for a long period of time. In good condition.

A method for producing a sheet-like member according to such an absorbent article,
The rotating body heated by the heating member rotates around a rotation axis along a CD direction intersecting the transport direction,
It is preferable that the heating member heats the rotating body with a predetermined heating pattern so that a temperature difference in the CD direction in the rotating body becomes small.

  According to the manufacturing method of the sheet-like member related to such an absorbent article, the temperature difference in the CD direction of the rotating body is reduced. Therefore, the variation in the size of the gap between the cutter blade and the anvil rotator can be reduced with respect to the CD direction, thereby increasing the formation accuracy of the crimping portion.

A method for producing a sheet-like member according to such an absorbent article,
The heating pattern is defined by the amount of heat (W / m) input per second per unit length in the CD direction,
Based on the heating pattern, it is preferable that the heating member inputs a larger amount of heat (W / m) to the end portion than the central portion of the rotating body in the CD direction.

  According to the method for manufacturing a sheet-like member according to such an absorbent article, the temperature difference in the CD direction of the rotating body is reduced when the temperature at the end is lower than the temperature at the center in the CD direction. be able to.

A method for producing a sheet-like member according to such an absorbent article,
The cutter blade is provided on the outer peripheral surface of the cutter rotating body via a cutter block,
A temperature sensor for measuring the temperature of the cutter rotating body is provided in an area where the cutter block exists in the CD direction,
It is desirable to adjust the amount of heating of the cutter rotating body based on the temperature measurement value of the temperature sensor.

  According to the manufacturing method of the sheet-like member related to such an absorbent article, the temperature of the portion close to the cutter blade is measured, and the heating amount of the cutter rotating body is adjusted based on the measured temperature value. Therefore, the adhesion of the adhesive to the cutter blade can be prevented more effectively.

A method for producing a sheet-like member according to such an absorbent article,
The rotating body heated by the heating member is preferably both the cutter rotating body and the anvil rotating body.

  According to the method for manufacturing a sheet-like member according to such an absorbent article, while effectively preventing the adhesive from adhering to both the cutter rotating body and the anvil rotating body, Cutting property can be improved.

A method for producing a sheet-like member according to such an absorbent article,
It is desirable to wind the composite sheet around the rotating body heated by the heating member.

  According to the method for manufacturing a sheet-like member related to such an absorbent article, the conveyance state of the composite sheet can be stabilized by wrapping around the rotating body, and as a result, the elastic member is more easily broken. It can be effectively suppressed. Incidentally, also in this case, the adhesion of the adhesive to the rotating body can be effectively prevented based on the fact that the heating to the rotating body is maintained at a temperature lower than the melting point of the adhesive.

A method for producing a sheet-like member according to such an absorbent article,
The composite sheet desirably has a lubricant.

  According to the method for manufacturing a sheet-like member according to such an absorbent article, since the composite sheet has the lubricant, the lubricant can quickly exert a lubricating action when being clamped by the cutter blade. Thus, the cutter blade can easily selectively cut the elastic member while crimping the first and second continuous sheets of the composite sheet without cutting.

Also,
An apparatus for manufacturing a sheet-like member having a high stretch region and a low stretch region having lower stretchability in a predetermined direction than the high stretch region, arranged in the predetermined direction,
Between the first continuous sheet that continues in the predetermined direction and the second continuous sheet that continues in the predetermined direction, an elastic member that extends in the predetermined direction and is inserted in the predetermined direction is inserted, at least A transport device that transports the composite sheet fixed with the thermoplastic adhesive in the region corresponding to the high stretch region, with the predetermined direction as the transport direction;
A cutter device that forms the high stretchable region and the low stretchable region side by side in the transport direction on the composite sheet by cutting the elastic member in at least one place in the transport direction in a region corresponding to the low stretchable region. And having
The cutter device is configured such that the temperature of at least one of the rotating body of the cutter and the anvil rotating body rotating with the outer peripheral surfaces facing each other, and the rotating body of the cutter and the anvil rotating body is a melting point of the adhesive. A heating member for heating the rotating body so as to be less than
When the composite sheet passes along the transport direction between the cutter rotator and the anvil rotator, the cutter blade on the outer peripheral surface of the cutter rotator and the anvil rotator pass the composite sheet. The absorbent article is characterized in that the elastic member is cut by forming a pressure-bonding portion between the first continuous sheet and the second continuous sheet at the clamped position in the composite sheet. It is a manufacturing apparatus of the sheet-like member which concerns on this.

  According to the manufacturing apparatus of the sheet-like member which concerns on such an absorbent article, there can exist an effect similar to the case of the manufacturing method mentioned above.

=== This Embodiment ===
The manufacturing method and the manufacturing apparatus 30 of the sheet-like member 20as which concern on the absorbent article of this embodiment are used in the manufacturing line 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 disposable diaper 1 as an example of the disposable diaper 1. FIG. 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, And it has the ventral side belt member 20a which covers the wearer's torso from the abdomen side, and has the back side band member 20b which covers the wearer's torso from the back side as the third 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.

  The absorbent main body 10 absorbs the absorbent core 11, the liquid-permeable surface sheet 13 that covers the core 11 from the skin side and forms the skin side surface of the absorbent main body 10, and the core 11 from the non-skin side. A liquid-impermeable back sheet 15 that forms the non-skin side surface of the adhesive 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 this example, the core 11 is covered with a liquid-permeable covering sheet 12, and the back sheet 15 has a two-layer structure having a nonwoven fabric 15nw and a resin film 15f. Not limited to this.

  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. In addition, both the sheets 21 and 22 are formed of a flexible thermoplastic sheet such as a nonwoven fabric. In this example, a spunbond nonwoven fabric is used. 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 FIG. 3 and FIG. 6, the planar size of the outer layer sheet 21 is a size that protrudes outward in the vertical direction from the inner layer sheet 22, and the protruding portion of the outer layer sheet 21. 21p is folded inward in the longitudinal direction to cover the longitudinal end portion 22e of the inner layer sheet 22, but is not limited thereto.

  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, only the ventral band member 20a will be described, and the description of the dorsal band member 20b will be 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 overlap with 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 25, 25... Arranged in the horizontal direction in a laterally stretched state and fixed in the same region AU in the vertical direction. The thread rubber 25 is fixed to the area AU by, for example, the thread rubber 25 or a hot melt adhesive applied to the area AU. Incidentally, examples of the fineness of the thread rubber 25 include 400 dtex to 1000 dtex, and specific examples of the thread rubber 25 include LYCRA (trademark). 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 generally fixed with a hot melt adhesive in the region AH1 corresponding to the stretchable region AH in the end side region ADe, but in the region AL1 corresponding to the non-stretchable region AL in the central region ADc, Generally not fixed. Therefore, in the area AL1 corresponding to the non-stretchable area AL, the band member 20a is clamped from both sides in the thickness direction by a cutter device 50, which will be described later, whereby the thread rubbers 27s, 27s. As shown in FIG. 5, the cut rubber threads 27, 27... Shrink toward the end in the lateral direction, and generally do not stay in the region AL1 corresponding to the non-stretchable region AL in the central region ADc, but expand and contract in the end side region ADe. The region AH1 corresponding to the region AH remains approximately, and as a result, the non-stretchable region AL is formed in the central region ADc, and the stretchable region AH is formed in the end side region ADe.

  Incidentally, in this example, a linear crimping portion j is formed at each position PC1 that is clamped from both sides in the thickness direction of the abdominal band member 20a when cutting the rubber threads 27s, 27s. This will be described later.

  In the manufacturing apparatus 30 of the sheet-like member 20as of the present embodiment, a continuous body 20as in which a plurality of the above-described ventral band members 20a are connected in the lateral direction is generated as an example of the sheet-like member 20as. FIG. 9A is a schematic plan view for explaining the sheet-like member 20as immediately before being conveyed to the manufacturing apparatus 30. FIG. At this time, the sheet-like member 20as is in a state where a plurality of ventral belt members 20a, 20a,. That is, the sheet-like member 20as includes a plurality of thread rubber continuous bodies 25s between a continuous sheet 21s (corresponding to the first continuous sheet) of the outer layer sheet and a continuous sheet 22s (corresponding to the second continuous sheet) of the inner layer sheet. , 25 s... And a plurality of thread rubber continuums 27 s, 27 s... Are in a state of a composite sheet 20 as joined to both continuous sheets 21 s, 22 s. The plurality of thread rubber continuums 25 s, 25 s... And the plurality of thread rubber continuums 27 s, 27 s... Extend in the continuous direction of the sheet-like member 20 as (corresponding to the composite sheet). The sheet-like member 20as is arranged side by side along the width. And the area | region of the one side of the width direction in the sheet-like member 20as is equivalent to the upper area | region AU of the ventral | abdominal band member 20a, and the area | region of the other side is equivalent to the lower area | region AD of the ventral | abdominal band member 20a. Therefore, in the former area AU, in order to form a stretchable region over the entire length in the continuous direction, a plurality of corresponding thread rubber continuous bodies 25 s, 25 s... It is fixed to each continuous sheet 21s, 22s related to the member 20as by a hot melt adhesive. On the other hand, in the latter area AD, since the stretchable area AH and the non-stretchable area AL are formed side by side in the continuous direction, a plurality of corresponding thread rubber continuous bodies 27s, 27s. The continuous sheets 21s and 22s according to 20as are intermittently fixed with a hot melt adhesive in the continuous direction. That is, in the continuous sheet 21s, 22s in FIG. 9A, in the region AH1 corresponding to the stretchable region AH, the thread rubber continuous bodies 27s, 27s... Are fixed by the hot melt adhesive, but correspond to the non-stretchable region AL. In the area AL1, it is not fixed. At this time, as shown in FIG. 9A, in each of the continuous sheets 21s and 22s, the area AH1 corresponding to the stretchable area AH and the area AL1 corresponding to the non-stretchable area AL are in a continuous direction at a ratio of 2 to 1. This is because the stretchable regions AH and AH exist on both sides in the lateral direction of the non-stretchable region AL in the single-cut ventral belt member 20a shown in FIG. However, here, it is not necessary to distinguish and explain the areas AH1 and AH1 corresponding to the two stretchable areas AH and AH adjacent to each other in FIG. 9A. Therefore, in the following, these two areas AH1 and AH1 are combined. This will be described as one area AH2. In this case, as shown in FIG. 9A, in the sheet-like member 20as, the regions AH2 corresponding to the stretchable regions AH and AH and the region AL1 corresponding to the non-stretchable region AL appear alternately in the continuous direction. ing. In addition, the region AL1 corresponding to the non-stretchable region AL appears on the sheet-like member 20as at the product pitch of the diaper 1 in the continuous direction. Therefore, in this manufacturing apparatus 30, the thread rubber continuums 27s, 27s,... Of the sheet-like member 20as are cut at the product pitch of the diaper 1 in the continuous direction, whereby, as shown in FIG. In 20 as, the stretchable areas AH, AH and the non-stretchable area AL are alternately formed in the continuous direction. And the continuous body 20as of ventral side belt member 20a, 20a ... as shown to the same FIG. 9B is produced | generated by the above.

  In the following description, the continuous direction of the sheet-like member 20as is also referred to as “MD direction”, and the width direction of the sheet-like member 20as is also referred to as “CD direction”. Incidentally, the thickness direction of the sheet-like member 20as, the MD direction as the continuous direction, and the CD direction as the width direction are orthogonal to each other.

  10A is a schematic side view of the manufacturing apparatus 30, and FIG. 10B is a view taken along the line BB in FIG. 10A.

  As shown in FIG. 10A, the manufacturing apparatus 30 includes a conveying device 40 that conveys the sheet-like member 20as having the thread rubber continuums 27s, 27s... With the MD direction as the conveying direction, and the sheet-like member 20as. And a cutter device 50 for cutting the thread rubber continuum 27s, 27s (corresponding to an elastic member).

  The transport device 40 includes, for example, a plurality of transport rollers 40R, 40R. And at least one of the plurality of transport rollers 40R, 40R ... is a drive roller that rotates around a rotation axis along the CD direction, and the transport roller 40R other than the drive roller is, for example, a sheet-like member This is a driven roller that rotates with 20as. In addition, it may replace with this conveyance roller 40R, or in addition to the roller 40R, the conveyance apparatus 40 may have a belt conveyor.

  The cutter device 50 includes a pair of upper and lower metal rolls 51u and 51d that rotate around a rotation axis along the CD direction, with the outer peripheral surfaces 51ua and 51da facing each other, and a continuous body 27s of thread rubber. And a housing 55 for receiving a reaction force of cutting acting on the rolls 51u and 51d at the time of cutting 27s.

  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. It can be moved up and down in the up and down direction, which is the contact and separation direction with respect to the lower roll 51d. By controlling the actuator 53, the size of the gap 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 sheet-like member 20as 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.

  Here, in this example, the lower roll 51d is a cutter roll (corresponding to a cutter rotating body), and the upper roll 51u 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 51da of the lower roll 51d at every angle corresponding to the product pitch of the diaper 1 in the rotation direction Dc51d. Specifically, in this example, as shown by hatching in FIG. 10A, two metal cutter blocks 54 and 54 are provided at an angle of 180 ° in the rotation direction Dc51d. Further, each cutter block 54 is formed with a plurality of cutter blades C, C..., And the outer peripheral surface 51 ua of the upper roll 51 u which is an anvil roll is smooth so as to receive the cutter blades C, C. It is considered as a surface. The rolls 51u and 51d are controlled to rotate in conjunction with the conveying operation of the sheet-like member 20as based on a synchronization signal or the like, whereby the area AL1 corresponding to the non-expandable area AL passes. Each time, the cutter roll 51d 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. 9A 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 51d. The cutter blades C, C... And the anvil roll 51u are clamped. Then, the thread rubber continuums 27s, 27s,... Are cut at the clamped positions PC1, respectively, so that the cut rubber thread 27 corresponds to the high expansion / contraction region AH as shown in FIG. 9B. The region AH1 contracts, and as a result, a non-stretchable region AL and a stretchable region AH are formed in the sheet-like member 20as.

  FIG. 11 is an explanatory view of the arrangement state of the cutter blades C, C... Provided on the cutter block 54 of the cutter roll 51d, and shows the outer peripheral surface 51da of the roll 51d developed on a plane.

  As shown in FIG. 11, the cutter block 54 is provided with a plurality of cutter blades C, C... With cutter blades C, C. . The length LC of the cutting edge in the extending direction is selected from a range of 4 mm to 30 mm, for example, and the dimension WC in the blade width direction orthogonal to the extending direction is selected from a range of 0.1 mm to 1 mm, for example. . However, the shape of the cutting edge is not limited to the linear shape as described above, and may be a zigzag broken line shape or a curved shape such as an arc line shape. Each of the cutter blades C, C... Is provided in association with each of the thread rubber continuums 27 s, 27 s. Therefore, the continuous bodies 27s, 27s... Of each rubber thread can be reliably cut at one place PC in the MD direction.

  Incidentally, in the example of FIG. 11, the direction of the cutter blades C and C is inclined at an inclination angle α having an appropriate magnitude other than 90 ° from the CD direction, and the inclination is not only the magnitude of the inclination angle α. As for the orientation, all cutter blades C, C. Specifically, in this example, the inclination angle α is set to 30 °, and with respect to the direction of inclination, the cutting edges of all the cutter blades C, C... Move toward the downstream side of the rotation direction Dc51d. They are set to be displaced to the same side in the CD direction. However, it is not limited to this. That is, the magnitude of the inclination angle α is not limited to the above 30 °, and the magnitude of the inclination angle α may not be uniform over all the cutter blades C, C. It is not necessary to align the inclination direction over all the cutter blades C, C.

  As shown in FIG. 10B, this cutter device 50 has side rings 51SR and 51SR at the respective ends of the cutter roll 51d 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 51d over the entire circumference in the rotational direction Dc51d. In the state where the outer peripheral surface 51SRa of the side ring 51SR is in contact with the outer peripheral surface 51ua of the anvil roll 51u, as shown in the schematic enlarged side view of FIG. 12, the cutting edge of the cutter blade C and the outer peripheral surface of the anvil roll 51u A gap G is formed with 51 ua. Specifically, the size of the gap G is set to, for example, 1 μm to 20 μm, desirably 5 μm to 15 μm, and in this example, 10 μm.

  And if it is made like this, when the sheet-like member 20as passes the cutter apparatus 50, the cutter blade C of the cutter roll 51d and the outer peripheral surface 51ua of the anvil roll 51u form a gap G between each other. In this state, the sheet-like member 20as is clamped. When this is done, the thread rubber continuous bodies 27s, 27s... Are cut at the clamped position PC1 in the sheet-like member 20as. In addition, the crimping portion j between the continuous sheet 21s of the outer layer sheet and the continuous sheet 22s of the inner layer sheet can be quickly formed. That is, at the time of cutting the continuous thread rubber 27s by the cutter blade C, the continuous sheet 21s and the continuous sheet 22s can enter the gap G, so that both the sheets 21s and 22s can enter the gap G. The crimping part j can be formed in a substantially film shape with a thickness of 10 μm, for example. As a result, it is effective that the continuous sheets 21s and 22s are partially cut and penetrated in the thickness direction at the clamped position PC1 with the cutting of the thread rubber continuous body 27s. As a result, damage to the continuum 20as of the ventral belt member 20a, which is the sheet-like member 20as that is finally generated, can be suppressed.

  Note that the state in which the side rings 51SR and 51SR are in contact with the anvil roll 51u is realized by the above-described actuator 53 such as a hydraulic cylinder exerting a vertical pressing force on both the cutter roll 51d and the anvil roll 51u. According to this contact state, the size of the gap G is maintained at a substantially constant value even when the sheet-like member 20as is clamped by the cutter blade C and the anvil roll 51u. can do. Also, at this time, various other gaps that can affect the gap G, such as gaps (not shown, outer races or inner races and rolling elements) that the bearing members 52d and 52u of the cutter roll 51d and the anvil roll 51u have inside. Also, the clearance between the two is reduced based on the pressure contact force of the actuator 53 like so-called “backlash”. This also can effectively contribute to maintaining the size of the gap G at a constant value.

  Incidentally, in this example, although the side ring 51SR is provided in the cutter roll 51d, it is not restricted to this at all. That is, instead of the cutter roll 51d or in addition to the cutter roll 51d, the anvil roll 51u may be provided.

  In the present embodiment, a heating mechanism is provided to heat the cutter roll 51d and the anvil roll 51u. And thereby, the cutting | disconnection property with respect to the continuous body 27s of the rubber thread of the cutter blade C of the cutter roll 51d is improved. That is, since the temperature of the cutter blade C is increased by heating the cutter roll 51d, the continuous sheet 21s of the outer layer sheet and the continuous sheet of the inner layer sheet from the blade C when the sheet-like member 20as is clamped by the blade C. An appropriate amount of heat can be quickly applied to 22s to soften the sheets 21s and 22s. As a result, the cutter blade C can be easily pushed in the thickness direction, and as a result, the clamping force of the cutter blade C can be easily applied to the thread rubber continuous body 27s. The cutting property of the body 27s can be improved.

  However, when the temperature is raised excessively, there arises a problem that the hot melt adhesive in the sheet-like member 20as adheres to the rolls 51u and 51d. That is, as described above, a hot melt adhesive is used for fixing the thread rubber continuous body 27s. However, the hot melt adhesive melts due to heat input to the adhesive, and has a sheet shape with its high fluidity. As a result, when contacting the sheet-like member 20as, the outer surface 51da of the cutter blade C and the cutter roll 51d, the outer surface 51ua of the anvil roll 51u, etc. There is a risk of adhesive depositing and depositing. Then, when the deposition progresses and the deposit becomes a large lump, and falls into the sheet-like member 20as, the portion of the sheet-like member 20as where the deposit is caught becomes a defective product. End up.

  Therefore, in the present embodiment, when the rolls 51d and 51u are heated, the temperatures of the cutter blade C and the outer peripheral surface 51ua of the anvil roll 51u receiving the same are less than the melting point of the hot melt adhesive (corresponding to a thermoplastic adhesive). It is performed in the range that becomes the temperature. For example, in this example, a rubber-based hot melt adhesive is used as the hot melt adhesive, and its melting point is 95 ° C. Therefore, the temperature of each roll 51d, 51u is heated and adjusted by the heating mechanism so that the temperature of each roll 51d, 51u falls within the range of 50 ° C. or more and less than 95 ° C. Incidentally, for example, a temperature higher than the ambient temperature of the rolls 51d and 51u (temperature of the surrounding atmosphere) is set to the lower limit value 50 ° C. of the temperature adjustment range. Also, depending on the type of hot melt adhesive, the nominal value of the melting point may be unknown, but in that case, the melting point value is replaced with the softening point value measured by the ring and ball method based on JISK2351. You may do it.

  13A and 13B are explanatory diagrams of the heating mechanism. FIG. 13A is a schematic longitudinal cross-sectional view of the cutter roll 51d and the anvil roll 51u, and FIG. 13B is a BB cross-sectional view in FIG. 13A. In FIG. 13A, a part of the configuration 71p is shown broken.

  As shown in FIG. 13A, the heating mechanism includes heating elements 71 and 71 (corresponding to heating members) that are separately inserted into the cutter roll 51d and the anvil roll 51u, and temperatures for measuring the temperatures of the rolls 51d and 51u. Sensors 75 and 75, and a temperature control unit 77 that controls the amount of heat generated by each of the heating elements 71 and 71 based on the temperature signals output from the temperature sensors 75 and 75.

  The heating elements 71 and 71 and the temperature sensors 75 and 75 are provided in association with each other for each of the rolls 51d and 51u. And the temperature control part 77 controls the emitted-heat amount of the corresponding heat generating body 71 based on the temperature signal of the temperature sensor 75, matching the temperature sensors 75 and 75 and the heat generating bodies 71 and 71, respectively. That is, the temperature signal of the temperature sensor 75 of the cutter roll 51d is used for temperature control of the heating element 71 in the cutter roll 51d, and the temperature signal of the temperature sensor 75 of the anvil roll 51u is the temperature of the heating element 71 in the anvil roll 51u. It is used for temperature control.

  The configurations of the heating element 71 and the temperature sensor 75 are substantially the same for both the cutter roll 51d and the anvil roll 51u. Therefore, only the heating element 71 and the temperature sensor 75 for the cutter roll 51d will be described below, and that for the anvil roll 51u will not be described.

  The heating element 71 is, for example, an electric heater that generates heat based on supplied power, and more specifically, is a rod-shaped cartridge heater 71 having an axial direction. The heater 71 has an accommodation hole 51dh formed in the roll 51d so as to be coaxial with the rotation axis of the roll 51d so that the cutter roll 51d is evenly heated by the heater 71 over the entire circumference in the rotation direction Dc51d. Further, it is inserted coaxially with the roll 51d. The heat generated from the heater 71 is transmitted radially in the rotational radius direction of the roll 51 d and finally reaches the cutter blade C via the cutter block 54.

  The cartridge heater 71 has a well-known configuration. Therefore, the following description is limited to the scope necessary for understanding the present invention and will not be described in detail. First, the heater 71 includes a pipe material 71p as a case, and a heating wire 71c that is housed in the pipe material 71p and wound in a coil shape with a substantially constant radius around the rotation shaft. When the lead wires 71L and 71L connected to both ends of the heating wire 71c are connected to the power source via the temperature control unit 77, the amount of heat generated (W) corresponding to the power (W) supplied from the power source. ), The heating wire 71c generates heat. Incidentally, in this example, by changing the magnitude of the supplied power and the number of turns N (turns / m) of the heating wire 71c per unit length in the axial direction (CD direction), the per unit length in the axial direction is changed. The amount of heat generated per second (W / m) can be changed.

  And according to this structure, adjustment to the said temperature range is made as follows. For example, when the indicated value of the temperature signal from the temperature sensor 75 is below the temperature range, the temperature control unit 77 supplies power to the heating element 71, whereas when the indicated value is above the temperature range, Stop power supply. As a result, the temperature of the roll 51d at the temperature measurement position can be generally kept within the temperature range of 50 ° C. or more and less than 95 ° C. Incidentally, the temperature control unit 77 is, for example, a computer, a PLC (programmable logic controller), or the like, that is, the power supply operation as described above is performed by a processor included in the temperature controller 77 reading and executing an appropriate program from the memory.

  For example, a thermocouple is used as the temperature sensor 75. Further, the temperature measuring position of the thermocouple is the position on the back side of the cutter block 54. That is, as shown in FIG. 13B, the position in the rotational radius direction is a position between the cutter block 54 and the heating element 71, and as shown in FIG. It is set as a predetermined position in the existing area A54. Furthermore, in the example of FIG. 13A, when the region A54 is virtually divided into two in the CD direction, the predetermined position of the temperature sensor 75 is included in the region A54E where the cutter blade C exists. Thus, the region A54N where the cutter blade C does not exist is not included.

  Therefore, the sensor 75 can measure the temperature of the part close to the cutter blade C, and adjusts the heating amount of the cutter roll 51d with this temperature measurement value, so that it has moderate accuracy and moderate response. Thus, the temperature of the roll 51d can be adjusted. As a result, the temperature can be almost surely kept within the above temperature range, and as a result, the hot melt adhesive can be more effectively adhered to the outer peripheral surface 51da of the cutter blade C, the cutter block 54, the cutter roll 51d, and the like. Can be prevented. However, the temperature measurement position of the temperature sensor 75 is not limited to the position on the back side of the cutter block 54 exemplified above, and the sensor 75 is not limited to any thermocouple.

  By the way, this heating mechanism also functions as a soaking device for equalizing the temperature distribution in the CD direction of each roll 51d (51u), which will be described below. First, each roll 51d (51u) in FIG. 13A has a temperature distribution in the CD direction due to a difference in heat dissipation depending on the position in the CD direction, and more specifically, in the CD direction. There is a temperature difference ΔTce such that the temperature of the central portion 51 dc (51 uc) is higher than the temperature of the same end portion 51 de (51 ue). And this temperature difference (DELTA) Tce can have a bad influence on the stable formation of the above-mentioned crimping | compression-bonding part j. For example, as described above, the gap G (FIG. 12) is required between the cutter blade C and the outer peripheral surface 51 ua of the anvil roll 51 u to form the crimping portion j, but the temperature difference ΔTce as described above. The gap G is too small at the center 51 dc (51 dc) even if the gap G having an appropriate size is formed at the end 51 de (51 ue) in the CD direction. Thereby, the crimping | compression-bonding part j may be penetrated in the thickness direction, without being formed. For this reason, the heating mechanism equalizes the temperature distribution in the CD direction of each roll 51d (51u) for the purpose of making the size of the gap G substantially constant over the CD direction.

  Hereinafter, although the device for functioning this heating mechanism as a temperature equalizing device will be described, this device is the same for the cutter roll 51d and the anvil roll 51u. Therefore, in the following, the cutter roll 51d will be described as an example.

  In the example of FIG. 13A, the heat generation amount (W / m) of the heating element 71 is changed according to the position in the CD direction based on a predetermined heating pattern. That is, in this heating pattern, the heat generation amount (W / m) at the end portion 51de is made larger than the heat generation amount (W / m) at the center portion 51dc, thereby compensating for the temperature difference ΔTce. Yes. The difference in the heat generation amount is set by setting the number N (turns / m) of the heating wire 71c described above with a difference corresponding to the temperature difference ΔTce between the end portion 51de and the central portion 51dc. This can be realized. That is, in this example, the number of turns N (turns / m) at the end 51de is larger than the number of turns N (turns / m) at the central part 51dc. The amount of heat generated at the end 51de is made larger than the amount of heat generated at the end 51de. However, the method of making the calorific value different between the end portion 51de and the central portion 51dc is not limited to this, and other methods may be used. For example, the heat generation amount may be made different by making the electric resistance of the heating wire 71c different between the end portion 51de and the central portion 51dc.

  By the way, desirably, the sheet-like member 20as has a lubricant. And if it becomes like this, the same lubricant can show | play a lubrication effect quickly at the time of pinching with the cutter blade C, Thereby, each continuous sheet 21s and 22s of an outer-layer sheet and an inner-layer sheet is carried out with the same cutter blade C. The thread rubber continuous body 27s can be cut while being crimped without being cut. Examples of such lubricants include surfactants and oils, and more specifically, oleic acid amide, erucic acid amide, stearic acid amide, etc. can be used, or modified silicone oil containing an amino acid Etc. Silicone oil such as olive oil, animal and vegetable oils such as olive oil, liquid paraffin and the like can be used. However, it is not limited to this. That is, if the friction coefficient at the position where the predetermined material is applied in the sheet-like member 20as can be reduced below the friction coefficient before application, the material can also exhibit the above-described lubricating action. Therefore, such a material can also be used as the above-mentioned lubricant. Incidentally, the friction coefficient can be measured using an automated surface tester (KES-FB4-AUTO-A) or a friction tester (KES-SE) (both manufactured by Kato Tech Co., Ltd.) As a method of including the lubricant in the sheet-like member 20as, a well-known application method such as slot coating can be exemplified.

  Desirably, the hot melt adhesive is applied not to the continuous sheets 21s and 22s of the outer layer sheet and the inner layer sheet but to the continuous thread rubber 27s. In this way, the continuous thread rubber 27s can be fixed in a relatively small amount as compared with the case where the continuous sheets 21s and 22s are applied. That is, the amount of the adhesive remaining on the sheet-like member 20as without contributing to the fixing of the continuous rubber rubber 27s can be greatly reduced. As a result, it is possible to suppress the lowering of the sheet-like member 20as that may occur when the amount of application is excessive, and to easily ensure the softness of the sheet-like member 20as.

  Incidentally, the following method can be illustrated about the application | coating method. FIG. 14A is a schematic side view showing a state of application, and FIG. 14B is a view taken along arrow BB in FIG. 14A. First, for the continuous rubber rubber 27s conveyed in the continuous direction, the substantially melted adhesive is applied from the hot melt adhesive injection hole N located above the continuous rubber rubber 27s, as shown in FIG. Spray continuously in the shape of a coating pattern. Then, as shown in FIG. 14A, the adhesive wraps around the outer circumferential surface of the continuous body 27s from the upper side of the thread rubber continuous body 27s, and quickly wraps around to the lower side of the outer circumferential surface. The adhesive is applied over the entire circumference of the outer peripheral surface of the rubber continuous body 27s.

  In some cases, as shown in the schematic side view of FIG. 15, the sheet-like member 20as may be wound around the roll 51d (51u) heated by the heating mechanism at a predetermined winding angle αw. In this embodiment, since both the rolls 51d and 51u of the cutter roll 51d and the anvil roll 51u are heated, they may be wound around either roll 51d (51u), but in the example of FIG. 15, the cutter roll 51d It is wrapped around. And if it does in this way, stabilization of the conveyance state of the sheet-like member 20as can be aimed at, and it becomes possible to suppress more effectively the cutting of the continuous body 27s of a rubber thread. Desirably, the wrapping is preferably performed at a position upstream of the position PZ where the thread rubber continuum 27s is cut, in the rotational direction Dc51d, so that the sheet-like member is cut before the thread rubber continuum 27s is cut. Heating to 20as can be performed sufficiently. As a result, it is possible to more effectively suppress the breakage of the continuum 27s based on the mechanism that facilitates the clamping pressure as described above to act on the continuum 27s.

  In this case, the winding angle αw can be 10 ° to 60 °, for example, and preferably 20 ° to 40 °. Incidentally, the definition of the winding angle αw is, for example, “a first line segment connecting the position Pss that starts to contact the outer peripheral surface 51da (51ua) of the roll 51d (51u) and the rotation axis of the roll 51d, and the roll 51d (51u). And the second line segment connecting the position Pse that starts to move away from the rotation axis and the same rotation axis can form the included angle αw ”formed between them.

=== 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, a rubber-based hot melt adhesive is exemplified as the thermoplastic adhesive, and the melting point is 95 ° C. However, the thermoplastic adhesive is not limited to the above. For example, an olefin hot melt adhesive having a melting point of 110 ° C. may be used as the adhesive.

  In the above-described embodiment, both the cutter roll 51d and the anvil roll 51u have the cartridge heater 71 as the heating member, but the invention is not limited to this. For example, only one of the cutter roll 51d and the anvil roll 51u may be provided, and in that case as well, the effect of suppressing breakage of the continuous thread rubber 27s can be enjoyed accordingly. Can do.

  In the above-described embodiment, the accommodation hole 51dh (51uh) of the cartridge heater 71 as the heating member is formed coaxially with the rotation shaft of each roll 51d (51u), and one cartridge is accommodated in the accommodation hole 51dh (51uh). Although heater 71 was inserted, it is not restricted to this at all. For example, each of the rolls 51d (51u) is equally divided into the rotation direction Dc51d (Dc51u), and the accommodation holes 51dh (51uh) are formed at the respective positions equidistant from the rotation axis in the rotation radius direction. The cartridge heater 71 may be accommodated in each of the accommodation holes 51dh (51uh).

  In the above-described embodiment, the cartridge heater 71 is illustrated as an example of the heating member. However, the present invention is not limited to this as long as each roll 51d (51u) can be heated. For example, an induction heating device may be used as the heating member. In addition, the induction heating apparatus has a dynamic magnetic field generation unit disposed so as to face the outer peripheral surface 51da (51ua) of each roll 51d (51u) in a non-contact manner, for example. The dynamic magnetic field generator applies a high-frequency dynamic magnetic field to the outer peripheral surface 51da (51ua), thereby generating an electric current in each roll 51d (51u), thereby heating the roll 51d (51u). To do.

  In the above-described embodiment, the thread rubber continuous body 27s as the elastic member is cut at one position PC (FIG. 11) in the rotation direction Dc51d in the area AL1 corresponding to the non-stretchable area AL, and the cut rubber thread is cut. The non-stretchable region AL is formed by contracting the continuous body 27s toward the region AH1 corresponding to the stretchable region AH. However, the present invention is not limited to this.

  For example, as shown in FIGS. 16A and 16B, in the region AL1 corresponding to the non-stretchable region AL, by cutting each continuous thread rubber 27s at a plurality of positions PC, PC... In the rotational direction Dc51d, The continuous thread rubber 27s may be cut into thin pieces with AL1, and the area AL1 may be made into a non-stretchable area AL. In this case, the thread rubber continuum 27s before cutting is fixed not only to the area AH1 corresponding to the stretchable area AH but also to the area AL1 corresponding to the non-stretchable area AL by hot melt adhesive. May be.

  In the above-described embodiment, the cutter roll 51d has the side ring 51SR, but the gap G (FIG. 12) can be formed between the cutter blade C of the cutter roll 51d and the outer peripheral surface 51ua of the anvil roll 51u. If so, the side ring 51SR may be omitted. For example, by controlling the position of the actuator 53 such as the aforementioned hydraulic cylinder shown in FIG. 10B, the vertical position as the contact / separation direction of the cutter roll 51d is adjusted so that the size of the gap G becomes a constant value. Anyway. Incidentally, 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.

  In the above-described embodiment, as shown in FIG. 11, a plurality of thread rubber continuums 27s, 27s... Are exemplified as the plurality of elastic members, and each of the plurality of thread rubber continuums 27s, 27s. On the other hand, the cutter blades C, C... Are provided one by one, but the present invention is not limited to this. For example, as an example of two or more, one cutter blade C may be associated with a continuous body 27s of two or three thread rubbers. That is, one cutter blade C may be provided so as to straddle two thread rubber continuums 27s, 27s or three thread rubber continuums 27s, 27s, 27s.

  In the above-described embodiment, the sheet-like member 20as includes the continuous sheet 21s of the outer layer sheet and the continuous sheet 22s of the inner layer sheet. However, another continuous sheet may be laminated.

  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 roll 51d is illustrated as the cutter rotating body, and the anvil roll 51u is 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 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 thread rubber continuous body 27s provided on a sheet-like member used in a two-piece type disposable diaper may be cut by the cutter device 50 described above. Incidentally, a two-piece type disposable diaper has a two-layered exterior sheet having an abdominal part, a crotch part, and a dorsal part as a first component, and is fixed to the skin side of the exterior sheet. This is a type of diaper having a sexable main body 10 as a second part. In that case, the continuous sheet of the exterior sheet corresponds to the sheet-like member 20as described above, and each of the thread rubber continuous bodies 27s, 27s,... It will be inserted in between.

  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 30 of the present invention are applicable to any absorbent article that uses the sheet-like member 20as as described above 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 (absorbent article), 1HB waistline opening, 1HL leg opening, 10 absorptive main body, 10ea end part, 10eb end part, 11 absorbent core, 12 covering sheet, 13 surface sheet, 15 back sheet, 15f resin Film, 15nw non-woven fabric, 17r elastic member, 20a ventral band member, 20ac central region, 20ae end, 20as sheet-like member, 20b dorsal band member, 20ae end, 21 outer layer sheet, 21p part, 21s continuous sheet of outer layer sheet ( 1st continuous sheet), 22 inner layer sheet, 22e end, 22s inner sheet continuous sheet, 25 thread rubber, 25s thread rubber continuum, 27 thread rubber, 27s thread rubber continuum (elastic member), 27sd thread rubber 30 manufacturing equipment, 40 transport equipment, 40R transport rollers, 50 cutters Equipment, 51SR side ring, 51SRa outer peripheral surface, 51d cutter roll (cutter rotating body), 51da outer peripheral surface, 51dc center, 51de end, 51dh receiving hole, 51u anvil roll (anvil rotating body), 51ua outer peripheral surface, 51uh Hole, 52d bearing member, 52u bearing member, 53 actuator, 54 cutter block, 55 housing, 71 cartridge heater (heating element), 71c heating wire, 71p pipe material, 75 temperature sensor, 77 temperature control unit, C cutter blade, j Linear crimping part, G gap, N injection hole, AU upper area, AD lower area, ADc central area, ADe end side area, AH stretch area (high stretch area), AH1 area, AH2 area, AL non-stretch area (low Telescopic area), AL1 area, PC position , PC1 position, PZ position, Pss position, Pse position, LSG standing gathers, LG leg gather, CL10 substantially central portion, A54 region, A54E region, A54N region,

Claims (10)

A method for producing a sheet-like member having a high stretch region and a low stretch region having lower stretchability in a predetermined direction than the high stretch region, arranged in the predetermined direction,
Between the first thermoplastic continuous sheet that continues in the predetermined direction and the second thermoplastic continuous sheet that continues in the predetermined direction, an elastic member that extends in the predetermined direction and is continuous in the predetermined direction is interposed. A composite sheet fixed with a thermoplastic adhesive at least in a region corresponding to the high stretch region while being inserted, and transporting the predetermined direction as a transport direction;
Forming the high stretch region and the low stretch region side by side in the transport direction on the composite sheet by cutting the elastic member in at least one place in the transport direction in a region corresponding to the low stretch region; Have
In the forming, the heating member is arranged such that the temperature of at least one of the rotating body of the cutter and the rotating body of the anvil rotating to face each other is less than the melting point of the adhesive. While the rotating body is heated, when the composite sheet passes along the transport direction between the cutter rotating body and the anvil rotating body, a cutter blade on the outer peripheral surface of the cutter rotating body; The elastic member is formed by forming a pressure-bonding portion between the first continuous sheet and the second continuous sheet at a position where the composite sheet is pressed by the anvil rotating body sandwiching the composite sheet. Cut and
The rotating body heated by the heating member rotates around a rotation axis along a CD direction intersecting the transport direction,
The method for manufacturing a sheet-like member according to an absorbent article , wherein the heating member heats the rotating body with a predetermined heating pattern so that a temperature difference in the CD direction in the rotating body is small . It is a manufacturing method of the sheet-like member concerning the absorptive article according to claim 1,
The manufacturing method of the sheet-like member which concerns on the absorbent article characterized by apply | coating the said adhesive agent to the said elastic member. It is a manufacturing method of the sheet-like member concerning the absorptive article according to claim 1 or 2,
The method of manufacturing a sheet-like member according to an absorbent article, wherein the rotating body heated by the heating member is the cutter rotating body. A method for producing a sheet-like member according to any one of claims 1 to 3 ,
The heating pattern is defined by the amount of heat (W / m) input per second per unit length in the CD direction,
Based on the heating pattern, the heating member puts more heat (W / m) into the end portion than the central portion in the CD direction of the rotating body. Manufacturing method of a shaped member. It is a manufacturing method of the sheet-like member concerning the absorptive article according to any one of claims 1 to 4 ,
The cutter blade is provided on the outer peripheral surface of the cutter rotating body via a cutter block,
A temperature sensor for measuring the temperature of the cutter rotating body is provided in an area where the cutter block exists in the CD direction,
The manufacturing method of the sheet-like member which concerns on the absorbent article characterized by adjusting the heating amount of the said cutter rotary body based on the temperature measurement value of the said temperature sensor. A method for producing a sheet-like member having a high stretch region and a low stretch region having lower stretchability in a predetermined direction than the high stretch region, arranged in the predetermined direction,
Between the first thermoplastic continuous sheet that continues in the predetermined direction and the second thermoplastic continuous sheet that continues in the predetermined direction, an elastic member that extends in the predetermined direction and is continuous in the predetermined direction is interposed. A composite sheet fixed with a thermoplastic adhesive at least in a region corresponding to the high stretch region while being inserted, and transporting the predetermined direction as a transport direction;
Forming the high stretch region and the low stretch region side by side in the transport direction on the composite sheet by cutting the elastic member in at least one place in the transport direction in a region corresponding to the low stretch region; Have
In the forming, the heating member is arranged such that the temperature of at least one of the rotating body of the cutter and the rotating body of the anvil rotating to face each other is less than the melting point of the adhesive. While the rotating body is heated, when the composite sheet passes along the transport direction between the cutter rotating body and the anvil rotating body, a cutter blade on the outer peripheral surface of the cutter rotating body; The elastic member is formed by forming a pressure-bonding portion between the first continuous sheet and the second continuous sheet at a position where the composite sheet is pressed by the anvil rotating body sandwiching the composite sheet. Cut and
The method of manufacturing a sheet-like member according to an absorbent article, wherein the rotating body heated by the heating member is both the cutter rotating body and the anvil rotating body. It is a manufacturing method of the sheet-like member concerning the absorptive article according to any one of claims 1 to 6 ,
A method for producing a sheet-like member according to an absorbent article, wherein the composite sheet is wound around the rotating body heated by the heating member. A method for manufacturing a sheet-like member according to any one of claims 1 to 7 ,
The said composite sheet has a lubricant, The manufacturing method of the sheet-like member which concerns on the absorbent article characterized by the above-mentioned. An apparatus for manufacturing a sheet-like member having a high stretch region and a low stretch region having lower stretchability in a predetermined direction than the high stretch region, arranged in the predetermined direction,
Between the first continuous sheet that continues in the predetermined direction and the second continuous sheet that continues in the predetermined direction, an elastic member that extends in the predetermined direction and is inserted in the predetermined direction is inserted, at least A transport device that transports the composite sheet fixed with the thermoplastic adhesive in the region corresponding to the high stretch region, with the predetermined direction as the transport direction;
A cutter device that forms the high stretchable region and the low stretchable region side by side in the transport direction on the composite sheet by cutting the elastic member in at least one place in the transport direction in a region corresponding to the low stretchable region. And having
The cutter device is configured such that the temperature of at least one of the rotating body of the cutter and the anvil rotating body rotating with the outer peripheral surfaces facing each other, and the rotating body of the cutter and the anvil rotating body is a melting point of the adhesive. A heating member that heats the rotating body so as to be less than
When the composite sheet passes along the transport direction between the cutter rotator and the anvil rotator, the cutter blade on the outer peripheral surface of the cutter rotator and the anvil rotator pass the composite sheet. By clamping, the elastic member is cut while forming a pressure-bonding portion between the first continuous sheet and the second continuous sheet at a position where the composite sheet is pressed .
The rotating body heated by the heating member rotates around a rotation axis along a CD direction intersecting the transport direction,
The apparatus for manufacturing a sheet-like member according to an absorbent article , wherein the heating member heats the rotating body with a predetermined heating pattern so that a temperature difference in the CD direction in the rotating body becomes small . An apparatus for manufacturing a sheet-like member having a high stretch region and a low stretch region having lower stretchability in a predetermined direction than the high stretch region, arranged in the predetermined direction,
  Between the first continuous sheet that continues in the predetermined direction and the second continuous sheet that continues in the predetermined direction, an elastic member that extends in the predetermined direction and is inserted in the predetermined direction is inserted, at least A transport device that transports the composite sheet fixed with the thermoplastic adhesive in the region corresponding to the high stretch region, with the predetermined direction as the transport direction;
  A cutter device that forms the high stretchable region and the low stretchable region side by side in the transport direction on the composite sheet by cutting the elastic member in at least one place in the transport direction in a region corresponding to the low stretchable region. And having
  The cutter device is configured such that the temperature of at least one of the rotating body of the cutter and the anvil rotating body rotating with the outer peripheral surfaces facing each other, and the rotating body of the cutter and the anvil rotating body is a melting point of the adhesive. A heating member for heating the rotating body so as to be less than
  When the composite sheet passes along the transport direction between the cutter rotator and the anvil rotator, the cutter blade on the outer peripheral surface of the cutter rotator and the anvil rotator pass the composite sheet. By clamping, the elastic member is cut while forming a pressure-bonding portion between the first continuous sheet and the second continuous sheet at a position where the composite sheet is pressed.
The rotating body heated by the heating member is both the cutter rotating body and the anvil rotating body, and the sheet-like member manufacturing apparatus according to the absorbent article.

Images