JP4909778B2 - Elastic material cutting roll and method for producing disposable diaper - Google Patents

Description

  The present invention sandwiches a sheet provided with an elastic material between two rolls and cuts the elastic material by applying pressure, and the elastic material cutting roll and the disposable diaper manufacturing method and the elastic material around the abdomen absorb the The present invention relates to a disposable diaper that is cut in an area overlapping with a body arrangement area.

  As the disposable diaper, for example, as in the disposable diaper 100 shown in FIG. 1, the disposable diaper is composed of the front body 2, the crotch 4, and the back body 6. A pants-type disposable diaper is known in which a single waist opening 10 and a pair of leg openings 12 (12a, 12b) are joined.

  In such a pants-type disposable diaper, as shown in FIG. 1, a portion along the waist opening 10 and the leg opening 12 and further between the waist opening 10 and the leg opening 12. In general, a configuration in which elastic materials such as rubber thread (waist elastic material 42, leg elastic material 40, belly elastic material 44) are arranged (see, for example, Patent Document 1).

  For example, as shown in FIG. 2, the disposable diaper as described above includes a long sheet material 49 (49a, 49b) made of nonwoven fabric or the like, a long waist elastic material 42, a leg elastic material 40, an abdomen. After continuously attaching the surrounding elastic material 44, fixing the absorbent main body 14 provided with the absorbent body 22, forming the hole 60 that later becomes the opening around the leg, and folding the sheet material 49 in half It is continuously manufactured by a method of obtaining a plurality of pants-type disposable diapers by forming the joint portion 8 by means such as heat sealing and separating the joint portion 8 at the portion.

  When the manufacturing method as described above is adopted, elastic materials such as waist elastic material, leg elastic material, and belly elastic material are continuously attached in the circumferential direction of the diaper. The force acts from the whole diaper circumferential direction.

  However, there are some diapers where it is not desired to apply the stretching force of the stretchable material. For example, the portion where the absorbent body is disposed is not preferable when the absorbent body contracts due to the expansion and contraction force, because the fit of the diaper and the wearing feeling are hindered.

  Therefore, a disposable diaper has been proposed in which a stretchable material is attached only to a part of the diaper in the circumferential direction, and a portion where stretchable force does not act is formed. For example, in the disposable diaper 110 shown in FIG. 3, the belly stretchable material 44 is not attached to the portion where the absorbent body 22 is disposed, so that the stretch force of the belly stretchable material 44 does not act on that portion. A disposable diaper constructed.

  As a manufacturing method of the disposable diaper as described above, for example, an elastic tape in which an elastic material is bonded to a sheet-like support is used, and the elastic tape is intermittently disposed on a long nonwoven fabric sheet, thereby providing an elastic force. There has been proposed a method for manufacturing an absorbent article that can form a portion where no action occurs (see, for example, Patent Document 2).

  In addition, after continuously attaching a long stretchable material to a long sheet material, the sheet material provided with the stretchable material is cut with a first roll in which a plurality of cutting projections are arranged, and There has also been proposed a method for manufacturing an elastic sheet, which is sandwiched between a second roll in which a concave part into which a convex part is inserted is formed and the elastic material is cut afterwards (for example, see Patent Document 3). .

Registered Utility Model No. 3024357 Japanese Patent No. 3156251 JP 2002-178428 A

  However, the manufacturing method described in Patent Document 2 requires an additional step of creating an elastic tape in which an elastic material is bonded to a sheet-like support, and intermittently arranges the elastic tape on the nonwoven fabric sheet. There is a need. Therefore, the process is complicated and the method is not highly productive.

  On the other hand, since the manufacturing method described in Patent Document 3 only needs to sandwich a sheet material provided with an elastic material between two rolls, the manufacturing method described in Patent Document 2 can be simplified. There are advantages. However, in this manufacturing method, there are cases where the stretchable material cannot be cut well, and there still remains a problem to be solved in terms of reliably cutting the stretchable material.

  As described above, at present, there is no disclosure of a method for simplifying the process, high productivity, and reliable cutting of the stretchable material, and such a method is eagerly desired. The present invention has been made to solve the above-described problems of the prior art, and provides a method for manufacturing a disposable diaper that has a simple process, is highly productive, and can reliably cut an elastic material. To do.

As a result of intensive studies to solve the problems of the prior art as described above, the present inventor divides a plurality of cutting projections into a plurality of regions and attaches them to a roll that cuts the elastic material of the disposable diaper. The present invention has been completed by conceiving that the above problem can be solved by providing a mechanism for adjusting the height of the cutting protrusion in at least one of the plurality of regions. Specifically, according to the present invention, the following stretchable material cutting rolls and disposable diaper manufacturing methods are provided.

[1] A first roll provided with cutting protrusions and a second roll disposed to face the first roll, the first roll having a plurality of cutting protrusions, The cutting projection is divided into a plurality of regions divided along the rotation axis direction of the roll, and at least one of the plurality of regions has a height of the cutting projection arranged in the region. A height adjusting mechanism for adjusting is further provided , a screw hole capable of fixing a screw to the first roll is formed, and the plurality of cutting protrusions are attached to a block in which a through hole is formed. A screw that penetrates the hole is fixed to at least a region on both side edges of the first roll, and further includes a frame-shaped pressing plate that presses the block against the roll. 1 row The pressing plate that presses the block fixed to the area on the both side edges of the roll is composed of two pressing plates divided along the rotation axis direction of the roll at the center of the area, and the height adjustment The mechanism is a stretchable material cutting roll having a structure in which a shim having a shape corresponding to each of two pressing plates is sandwiched between the block and the first roll.

[ 2 ] The stretchable material cutting roll according to [1] , wherein the plurality of regions are arranged so as to be shifted in a circumferential direction of the roll.

[ 3 ] The elastic material cutting roll according to [1] or [2] , wherein a plurality of cutting protrusions are attached to each of the plurality of regions.

[ 4 ] The elastic material cutting roll according to any one of [1] to [ 3 ], wherein the cutting protrusion is capable of forming a character-shaped cutting trace.

[ 5 ] An elastic material cutting step for cutting an elastic material fixed to a sheet material constituting a disposable diaper, wherein the elastic material cutting step has a plurality of cutting protrusions, and the cutting protrusions are in the direction of the rotation axis of the roll. The stretchable material is fixed between a first roll that is divided along a plurality of regions and is arranged so as to face the first roll. The elastic material is cut by sandwiching and pressing the sheet, and a screw hole capable of fixing a screw is formed as the first roll, and a plurality of the cutting protrusions are formed with through holes. A block-shaped pressing plate that is fixed to at least the regions on both sides of the roll by screws that pass through the through holes, and that presses the block against the roll. Of the presser plates, the presser plate that presses the block fixed to the region on both sides of the roll of the first roll is composed of two presser plates divided along the rotation axis direction of the roll at the center of the region. using those, the height of the arranged the cutting projections into the plurality of regions, in between the first roll block, sandwiching a shim having a shape corresponding to each of the two pressing plates by crowded, after adjusting for the area of the roll on both sides edge of the at least the first roll, performing the cutting method of the disposable diaper.

[ 6 ] As the first roll, the plurality of regions are arranged so as to be shifted in the circumferential direction of the roll, and the stretchable material is attached to each part corresponding to the plurality of regions of the first roll. The method for producing a disposable diaper according to [5] , wherein the disposable diaper is sequentially cut.

[ 7 ] As the first roll, a plurality of the cutting protrusions are provided in each of the plurality of regions, and the elastic material corresponds to the plurality of regions of the first roll. The method for producing a disposable diaper according to [5] or [6] , wherein each part is cut by a plurality of the cutting protrusions.

[ 8 ] The first roll having a cutting protrusion capable of forming a character-shaped cutting trace is used to cut the elastic material and to form a character-shaped cutting trace on the sheet material. [5] -The manufacturing method of the disposable diaper in any one of [7] .

  The manufacturing method of the disposable diaper of this invention has a simple process, high productivity, and can cut | disconnect an elastic material reliably.

Hereinafter, the best mode for carrying out the elastic material cutting roll and disposable diaper manufacturing method of the present invention will be specifically described. However, the present invention broadly includes an elastic material cutting roll and a manufacturing method having the invention-specific matters, and is not limited to the following embodiments. For the convenience of drawing, FIGS. 6, 8, 10, and 12 are drawn by omitting a part of the configuration of the invention.

[1] Elastic material cutting roll:
The stretchable material cutting roll of the present invention is, for example, like a stretchable material cutting roll 50A shown in FIGS. 4 to 6, and a first roll 54A provided with cutting protrusions 52, and the first roll 54A opposite to each other. The first roll 54 has a plurality of the cutting protrusions 52, and the cutting protrusions 52 are divided along the rotation axis (OO ′) direction of the roll. The plurality of regions 56a, 56b, and 56c are divided and arranged, and at least one of the plurality of regions 56a, 56b, and 56c has a height of the cutting protrusion 52 disposed in the region 56a, 56b, and 56c. A height adjusting mechanism 58 for adjusting the height is further provided.

  The stretchable material cutting roll of the present invention is a roll for cutting a stretchable material fixed to a sheet material constituting a disposable diaper. By sandwiching a sheet with a stretchable material between two rolls and applying pressure, the roll is cut. The elastic material is cut. This stretchable material cutting roll can be installed and used in a part of a disposable diaper manufacturing apparatus.

[1-1] First roll:
The first roll is one roll constituting an elastic material cutting roll. For example, the first roll has a plurality of cutting protrusions 52 like the first roll 54A shown in FIGS. 4 to 6, and the cutting protrusions 52 are rolls. Are divided into a plurality of regions 56a, 56b, 56c divided along the direction of the rotation axis (OO ′), and at least one of the regions 56a, 56b, 56c A height adjusting mechanism 58 for adjusting the height of the cutting projection 52 arranged in the regions 56a, 56b, and 56c is further provided.

  Where the cutting protrusions are not divided into multiple areas as in the past, but are continuously attached in the direction of the rotation axis of the roll, the cutting protrusions do not hit the entire sheet material evenly, and the stretch material is insufficiently cut There was a problem that occurred. This is because a) the thickness of the sheet material varies depending on the part, b) the roll is bent and deformed by pressurization, c) the roll is deformed due to thermal expansion (not only pressure but also heat is applied to This is particularly remarkable when the roll is deformed by high-speed rotation or the like.

  In the configuration in which the height adjusting mechanism that adjusts the height of the cutting protrusion is provided in each of the divided areas as described above, even in the cases a) to d), the thickness for each part of the sheet material, The cutting projections can be adjusted to an appropriate height for each region in consideration of the degree of deformation of the roll, deformation due to thermal expansion, and deformation due to high-speed rotation of the roll. Therefore, it is possible to press the cutting protrusions uniformly against the sheet material, and it is possible to reliably cut the stretchable material.

In the present invention, the height adjusting mechanism includes a block (support) provided with a plurality of cutting protrusions and formed with a through hole, and a screw (bolt or the like) that penetrates the through hole. And In this embodiment, a screw hole capable of fixing the screw is formed in the first roll, and the block is fixed to the first roll with the screw.

As the height adjusting mechanism, there is a mechanism that adjusts the height of the block, and hence the height of the cutting protrusion, only by tightening the screw. In the present invention, the height adjustment mechanism is provided between the block and the first roll. and a structure sandwiching a shim (thin metal plate, spacer) to. Such a height adjustment mechanism has an advantage that more precise height adjustment is possible depending on the thickness and number of shims.

  For example, the height adjustment mechanism 58a, 58b, 58c of the first roll 54A shown in FIGS. 4 to 6 includes a block (support) provided with a plurality of cutting protrusions 52 and formed with through holes, and the through holes. This is an example of a height adjusting mechanism including a screw 62 that passes through the frame, and further includes a frame-shaped pressing plate 60 that presses the block against the first roll 54A. In this example, a screw hole capable of fixing the screw 62 is formed in the first roll 54 </ b> A, and the block is fixed to the first roll 54 </ b> A by the screw 62. And this height adjustment mechanism 58a, 58b, 58c inserts the shim in which the through-hole which can insert the screw | thread 62 between a block and the 1st roll 54A was inserted, and adjusts height with the number of the shim. It is configured to be able to.

The height adjusting mechanism further includes a frame-like pressing plate that presses the block against the roll, and the pressing plate presses the block fixed to the area on the both side edges of the first roll of the pressing plate. The plate is composed of two pressing plates divided along the rotation axis direction of the roll at the center of the region, and the height adjusting mechanism has a shape corresponding to each of the two pressing plates. It shall have a structure that sandwiches shims.

For example, the first region 56a of the roll on both sides edge of the roll 54A, the fixed block 56c height adjusting mechanism 58a shown in FIGS. 4 to 6, 58c may retainer plate 60 regions 56a, 56c centrally roles It consists of two pressing plates 60a and 60b divided along the direction of the rotation axis, and has a structure in which shims having shapes corresponding to the two pressing plates 60a and 60b can be sandwiched. Yes. In such a configuration, even when the center side of the roll is bent due to heating or pressurization, the number of shims sandwiched under the center side pressing plate 60a is more than the number of shims sandwiched under the side edge side pressing plate 60b. By increasing the number, the cutting protrusion 52 can be made to hit the sheet material accurately.

The first roll 54A shown in FIGS. 4 to 6 includes the height adjustment mechanisms 58a, 58b, and 58c for all the regions 56a, 56b, and 56c. In the present invention, the first roll is at least a roll. The height adjustment mechanism should just be provided about the area | region of the both-sides edge side . For example, in the same structure as the first roll 54A shown in FIGS. 4 to 6, even if the height adjustment mechanism is provided only in the regions 56a and 56c on the roll side edge side, the height adjustment in that region is possible. Therefore, the effect of the present invention can be obtained.

  In the first roll, the region where the cutting protrusion is provided is divided into a plurality of regions. The number of regions is not particularly limited, but considering the case where the manufacturing method as shown in FIG. 2 is adopted, it corresponds to the arrangement part of the elastic material around the front body side and the elastic material around the back body side of the disposable diaper. Therefore, it is preferable to divide into at least two regions, and at least three regions corresponding to the arrangement positions of the front body side abdominal stretch material, the crotch leg stretch material, and the back body side abdominal stretch material It is more preferable to divide into regions.

  For example, in the elastic material cutting roll 50A shown in FIGS. 4 to 6, the regions 56a, 56b, and 56c to which the cutting protrusions 52 of the first roll 54A are attached are elastic materials around the abdomen on the front body side of the disposable diaper, and legs of the crotch It is the example divided into three areas corresponding to the arrangement part of the circumference elastic material and the belly circumference elastic material of the back body side. FIG. 7 is a view showing a state in which a disposable diaper in which the elastic material has been cut by the elastic material cutting roll 50 shown in FIGS. 4 to 6 is developed, and the elastic material 44 around the abdomen on the front body 2 side of the disposable diaper. The leg elastic member 40 of the crotch part 4 and the belly elastic member 44 on the back body 6 side are sequentially cut to form cut marks 64a, 64b and 64c.

  In addition, it is preferable to divide the region to which the cutting protrusion is attached into at least two regions as described above, and it is more preferable to divide into at least three regions, but it may be divided into four or more regions. . For example, the first roll 54B shown in FIG. 8 and the first roll 54C shown in FIG. 10 are examples in which the area where the cutting protrusion is attached is divided into five. In these examples, regions 56a and 56e are formed so as to correspond to the arrangement site of the belly stretchable material 44 on the front body 2 side of the disposable diaper so as to correspond to the placement site of the leg circumference stretchable material 40 of the crotch part 4. A region 56b is formed in the region, and regions 56c and 56d are formed so as to correspond to the arrangement site of the belly stretchable material 44 on the back body 6 side.

  According to the first roll 54B shown in FIG. 8 and the first roll 54C shown in FIG. 10, as shown in FIGS. 9 and 11, first, the belly elastic member 44 on the front body 2 side and the belly on the back body 6 side. The surrounding elastic material 44 is cut to form cut marks 64a and 64e, then the leg elastic material 40 of the crotch part 4 is cut to form the cut marks 64b, and finally the belly on the front body 2 side. The surrounding elastic material 44 and the belly surrounding elastic material 44 on the back body 6 side are cut to form cutting marks 64d and 64c.

  As described above, when a plurality of regions corresponding to the arrangement portions of the front body side abdominal stretch material and the back body side abdominal stretch material are formed, generally the number of the leg body stretch material is larger than the number of the cuts. This is preferable because the elastic material around the abdomen that is difficult to cut can be cut more reliably.

  Moreover, in a 1st roll, the area | region where the cutting protrusion was attached is divided along the rotating shaft direction of a roll. That is, the region needs to be divided into several parts in the direction of the rotation axis of the roll. For example, in the stretchable material cutting roll 50 shown in FIGS. 4 to 6, the region 56 to which the cutting protrusion 52 in the first roll 54 </ b> A is attached has three regions 56 a toward the rotation axis direction (OO ′ direction) of the roll. , 56b, 56c. However, as long as the area | region which attaches a cutting protrusion is divided along the rotating shaft direction of a roll, you may be divided along the circumferential direction of a roll.

  Furthermore, in the first roll, it is preferable that the plurality of regions are arranged so as to be shifted in the circumferential direction of the roll. As described above, by shifting the plurality of regions in the circumferential direction of the roll, the cutting protrusions attached to each region do not hit the sheet material to which the elastic material is fixed at one time. That is, since the cutting protrusions sequentially hit the sheet material as the roll rotates, all the cutting protrusions are attached in a line along the rotation axis direction of the roll so that the cutting protrusions hit the sheet material (and thus the elastic material) at a time. Compared with a simple configuration, the applied pressure of the roll is not dispersed, and the applied pressure of the roll can be sufficiently applied to the sheet material and the stretchable material.

  In the above configuration, it is preferable that the plurality of regions are arranged so as to be sequentially shifted from the viewpoint of sufficiently applying the pressing force of the roll to the sheet material or the stretchable material. For example, in the stretchable material cutting roll 50 shown in FIG. 5, the attachment region 56 of the cutting protrusion 52 in the first roll 54 is stretchable around the abdomen on the front body side, stretchable material around the legs, and stretched around the abdomen on the back body side of the disposable diaper. This is an example in which the three regions 56a, 56b, and 56c corresponding to the arrangement positions of the materials are divided, and the three regions 56a, 56b, and 56c are sequentially shifted by 40 ° as the roll rotation angle.

  However, in the above-described configuration, all the cutting protrusions are not necessarily provided in a line along the rotation axis direction of the roll, and it is not always necessary that all the regions are disposed at a shifted position. For example, in the first roll 54B shown in FIG. 8 and the first roll 54C shown in FIG. 10, the region 56a and the region 56e, and the region 56c and the region 56d are arranged at substantially the same position along the rotation axis of the roll. The region 56a (region 56e), the region 56b, and the region 56c (region 56d) are arranged so as to be sequentially shifted by 40 ° as the rotation angle of the roll. Therefore, the applied pressure of the roll is not dispersed, and the applied pressure of the roll can be sufficiently applied to the sheet material and the stretchable material.

  The first roll has a plurality of cutting protrusions. A number corresponding to at least the number of divided areas is necessary, but the upper limit is not particularly limited. For example, a form in which a plurality of the cutting protrusions are attached to each of the plurality of areas is also a preferable form. For example, in the elastic material cutting roll 50A shown in FIGS. 4 to 6, the attachment area 56 of the cutting protrusion 52 in the first roll 54A is divided into three areas 56a, 56b, and 56c. In this example, ten plate-like cutting projections 52 are provided, and four plate-like cutting projections 52 are provided in the region 56b.

  As described above, in a form in which a plurality of cutting protrusions are attached to each of the plurality of areas, a plurality of cutting protrusions exist in the circumferential direction (rotation direction) of the roll. The attached form is more preferable. In such a case, even if the elastic material cannot be cut by one cutting projection, the second and subsequent cutting projections cut the elastic material, so that the elastic material can be cut more reliably. Become.

  For example, the first roll 54A shown in FIGS. 4 to 6, the first roll 54B shown in FIG. 8, and the first roll 54C shown in FIG. 10 have a plate-like cutting projection 52 in the circumferential direction (rotation direction) of the roll. In this example, the plate-like cutting projections 52 arranged in an inclined manner are arranged so as to partially overlap the circumferential direction (rotation direction) of the roll.

  In the first roll 54D shown in FIG. 12, in the regions 56a and 56c, a plurality of short plate-like cutting projections 52 are arranged in the circumferential direction (rotation direction) of the roll, and the positions of the first rolls 54D are rolled every other row. This is a mode in which a plurality of cutting protrusions 52a and 52c are provided so as to exist in the circumferential direction (rotation direction) of the roll. Such a configuration can cut the stretchable material more reliably as compared with the first roll 54A shown in FIGS. 4 to 6, the first roll 54B shown in FIG. 8, and the first roll 54C shown in FIG. It becomes possible.

  FIG. 13 is a view showing a state in which a disposable diaper in which the elastic material has been cut by the elastic material cutting roll 50 </ b> D shown in FIG. 12 is developed, and the belly circumference elastic material 44 and the back body 6 on the front body 2 side of the disposable diaper. The side belly stretchable material 44 is cut in multiple stages to form cut marks 64a and 64c.

  The shape of the cutting protrusion is not particularly limited, and various shapes such as a rectangular shape, a dot shape, a circular shape, and a lattice shape can be employed. Especially, the plate-shaped cutting protrusion (cutting blade) with the high effect which cut | disconnects an elastic material can be used suitably.

  Moreover, in the first roll, it is also preferable that the cutting protrusion is capable of forming a character-shaped cutting mark. Such a form is advantageous in that the design effect of the product can be improved because the elastic material fixed to the sheet material by the cutting protrusion is cut and the cut mark of the character shape is drilled. There is.

  The “character” mentioned here is not limited to characters such as cartoon characters, anime characters, and animals, but may be characters, figures, symbols, or the like. For example, the cut marks 66 shown in FIG. 14 are flower-shaped cut marks, and the cut marks 68 shown in FIG. 15 are cut marks that image the sun. The “cutting trace” may be formed by a single cutting protrusion, or may be formed by a plurality of cutting protrusions. For example, the cutting mark 66 shown in FIG. 14 and the cutting mark 68 shown in FIG. 15 are examples in which one character is formed by a plurality of cutting protrusions.

  The overall shape of the first roll is not particularly limited, but usually a cylindrical shape, for example, a shape similar to a conventionally known emboss roll is used. Although the material is not particularly limited, a metal material can be preferably used. Further, the first roll may be provided with a heater for cutting the stretchable material by applying heat as well as pressure, and a thermocouple for measuring the temperature of the roll.

[1-2] Second roll:
Similar to the first roll, the second roll is one roll that constitutes the elastic material cutting roll, and is disposed so as to face the first roll. Since the basic configuration is the same as that of the first roll, a description thereof will be omitted, and only portions different from the first roll will be described.

  Specific examples of the second roll include an embossing roll and a plain roll in which a recess that can be fitted with the cutting protrusion attached to the first roll is formed.

  The shape of the concave portion of the embossing roll used as the second roll is formed into a shape that can be fitted to the cutting protrusion of the first roll, for example, a shape complementary to the convex shape of the cutting protrusion. However, it is not always necessary for one recess to correspond to one cutting projection, and for example, one recess that can include and fit two or more cutting projections may be formed. Unlike the embossing roll, the plain roll has no unevenness on the surface and has a smooth surface. Therefore, there is an advantage that the operation of forming the concave portion in accordance with the shape of the cutting protrusion of the first roll is unnecessary, and the manufacturing is easy. Moreover, compared with the embossing roll, it is preferable in that the alignment with the cutting protrusion of the first roll is unnecessary and the adjustment of the machine is easy.

  Since the stretchable material cutting roll of the present invention cuts the stretchable material by sandwiching the sheet material with the stretchable material fixed between the first roll and the second roll, the second roll is the first roll. Arranged to face the roll. At this time, both rolls are arranged at positions where the cut protrusions of the first roll and the recesses of the second roll engage with each other, the sheet material is sandwiched between both rolls, and the sheet material is pressed with the roll, thereby expanding and contracting. The material can be cut.

[2] Disposable diaper manufacturing method:
The manufacturing method of the disposable diaper of the present invention includes an elastic material cutting step of cutting an elastic material fixed to a sheet material constituting the disposable diaper, and the elastic material cutting step has a plurality of cutting protrusions, and the cutting The protrusion is divided along the rotation axis direction of the roll, and is divided between the first roll arranged in a plurality of regions and the second roll arranged so as to face the first roll, The elastic material is cut by sandwiching and pressing the sheet on which the elastic material is fixed, and the height of the cutting projections arranged in the plurality of regions is adjusted for at least one region Then, the cutting is performed.

[2-1] Stretch material cutting step:
The elastic material cutting step in the manufacturing method of the present invention uses a first roll in which a plurality of cutting protrusions are divided and arranged in a plurality of regions, and the height of the cutting protrusions arranged in the plurality of regions. The method is characterized in that the cutting is performed after adjusting at least one region. According to such a method, a) when the thickness of the sheet material varies depending on the part, b) when the roll is bent and deformed by pressurization, c) when the roll is deformed by thermal expansion (not only pressure but also heat is applied) Cutting the elastic material), d) Even when the roll is deformed by high-speed rotation, etc., the cutting protrusion can be pressed uniformly against the sheet material, and the elastic material can be cut reliably. It becomes.

  The production method of the present invention can be performed using, for example, the already described stretchable material cutting roll of the present invention. That is, the elastic material cutting roll of the present invention includes a first roll in which a plurality of cutting protrusions are divided and arranged in a plurality of areas, and is arranged in one of the plurality of areas. And a height adjusting mechanism for adjusting the height of the cutting protrusion. Therefore, cutting can be performed after adjusting the height of the cutting protrusions arranged in the plurality of regions with respect to at least one region, which can be suitably used in the manufacturing method of the present invention.

In the present invention, a screw hole capable of fixing a screw is formed as the first roll, and the plurality of cutting protrusions are attached to a block in which a through hole is formed, and the block penetrates the through hole. The height of the cutting protrusion is adjusted by sandwiching a shim between the first roll and the block using a screw fixed by a screw. Such a method has the advantage that more precise height adjustment is possible depending on the thickness and number of shims.

Further, in the present invention, as the first roll, a frame-like pressing plate that presses the block against the roll is further provided, and of the pressing plate , the first roll is fixed to a region on both side edges of the roll. A pressing plate that presses down the block is composed of two pressing plates that are divided along the rotation axis direction of the roll at the center of the region, and between the first roll and the block, The height of the cutting protrusion is adjusted by sandwiching a shim having a shape corresponding to each of the two pressing plates.

For example, as shown in FIGS. 4 to 6, the height adjustment composed of two pressing plates 60 a and 60 b in which the pressing plate 60 is divided along the rotation axis direction of the roll at the center of the regions 56 a and 56 c. If the first roll 54A provided with the mechanisms 58a and 58c is used, even if the center side of the roll is bent due to heating or pressurization, the number of shims sandwiched under the center side pressing plate 60a can be reduced. By increasing the number of shims sandwiched below the cutting projection 52, the cutting projection 52 can be made to hit the sheet material accurately.

The first roll 54A shown in FIGS. 4 to 6 includes the height adjusting mechanisms 58a, 58b, and 58c for all the regions 56a, 56b, and 56c. However, in the manufacturing method of the present invention, at least the both side edges of the rolls are provided. A region having a height adjustment mechanism may be used. For example, in the same structure as the first roll 54A shown in FIG. 4 to FIG. 6, the effect of the present invention can be obtained even if a roll side edge side region 56a, 56c is provided with a height adjusting mechanism. .

  In the manufacturing method of the present invention, as the first roll, the plurality of regions are arranged so as to be shifted in the circumferential direction of the roll, and the elastic material is used as the plurality of regions of the first roll. It is preferable to cut every part corresponding to. By such a method, the cutting protrusions attached to each region do not hit the sheet material to which the elastic material is fixed at a time. That is, since the cutting protrusions sequentially hit the sheet material as the roll rotates, all the cutting protrusions are attached in a line along the rotation axis direction of the roll so that the cutting protrusions hit the sheet material (and thus the elastic material) at a time. Compared with a simple configuration, the applied pressure of the roll is not dispersed, and the applied pressure of the roll can be sufficiently applied to the sheet material and the stretchable material.

  In the manufacturing method of the present invention, as the first roll, a plurality of the cutting protrusions are provided in each of the plurality of regions, and the elastic material is used as the plurality of the first rolls. It is preferable that each of the parts corresponding to the region is cut by a plurality of the cutting protrusions. In such a method, even if the elastic material cannot be cut by one cutting projection, the second and subsequent cutting projections cut the elastic material, so that the elastic material can be cut more reliably. Become.

  In the manufacturing method of the present invention, as the first roll, a roll having a cutting projection capable of forming a character-shaped cutting trace is used, and the elastic material is cut and the character-shaped cutting trace is formed on the sheet material. It is preferable. Such a method is advantageous in that the design effect of the product can be improved because the elastic material fixed to the sheet material is cut by the cutting protrusions and the character-shaped cutting trace is drilled. There is.

  The production method of the present invention is not particularly limited with respect to the other steps as long as it includes the stretch material cutting step as described above, and can be produced according to a conventionally known method. Hereinafter, the manufacturing method of the present invention will be described with reference to the example of the manufacturing method shown in FIG. Note that FIG. 16 is drawn in a form in which a part of the elastic material around the legs, the elastic material around the waist, and the elastic material around the belly is discarded for the convenience of drawing. In FIG. 16, only the second roll 70 is shown in the elastic material cutting roll 50 </ b> A, but a first roll (not shown) is arranged at a position opposite to the second roll 70.

[2-2] Formation of absorbent main body:
First, as shown in FIG. 16, a pad-shaped absorbent main body 14 in which an absorbent body 22 is interposed between a top sheet and a back sheet is manufactured. For example, the absorber 22 wrapped in a hydrophilic sheet is disposed on the upper surface of the back sheet, and the top sheet is further disposed on the upper surface. Subsequently, the absorptive main body 14 is obtained by sealing the peripheral part of the absorber 22 so as to be sandwiched between the top sheet and the back sheet. The absorbent main body 14 has a three-dimensional gather 26, which is a leak-proof wall that can stand up three-dimensionally, by separately attaching a sheet material. These processes can be manufactured by a continuous manufacturing process by using a long sheet material as a constituent material of each member.

[2-3] Formation of exterior member continuum:
Next, an exterior member continuum comprising two sheet members 49 (49a, 49b), and a long waist elastic member 42, leg elastic member 40, and belly elastic member 44 are continuously provided between the two sheets 49 (49a, 49b). Form. The long waist elastic member 42, leg elastic member 40, and belly elastic member 44 are fixed to a sheet material 49 made of a nonwoven fabric or the like using a hot melt adhesive or the like. At this time, the hot melt adhesive is not applied to the position overlapping with the absorbent main body 14 (particularly, the absorber 22), or the application amount is reduced so that the stretchable material is not fixed to the sheet material 49. By doing this, the elastic material snaps back when the elastic material is cut later, so that the elastic force does not act on the part overlapping the absorber, and the necessary elastic force can be applied to the other parts. It becomes possible.

[2-4] Cutting elastic material:
Further, the exterior member continuous body formed as described above is sandwiched between and pressed by the elastic material cutting roll 50A, and at least the belly elastic member 44, preferably the leg elastic member 40 is further cut. At this time, it is also preferable to use a roll with a built-in heater and to cut the stretchable material while heating. In the illustrated example, the elastic material cutting roll 50A shown in FIGS. 4 to 6 is used as the elastic material cutting roll, and the leg elastic material 40 is cut in addition to the belly elastic material 44 attached to the exterior member continuous body. This is an example. In this example, cut marks 64a, 64b, and 64c are formed on the back surface side (the outer surface of the diaper) of the sheet material 49 by a first roll (not shown).

[2-5] Formation of diaper continuum:
Furthermore, after disposing and fixing the absorbent main body 14 intermittently in the longitudinal direction of the exterior member continuous body, a portion corresponding to the opening around the leg is cut out to form the hole 24. Then, after folding so that the side edges of the exterior member continuous body to which the absorbent main body 14 is fixed overlap each other, the gap portion of the absorbent main body 14 that is intermittently disposed and fixed is joined to the diaper side An edge joint 8 is formed to form a diaper continuum.

  In the example shown in FIG. 16, after folding so that the side edges of the exterior member continuum overlap each other (so that the edge on the upper side of the drawing and the edge on the lower side of the drawing overlap), they are arranged and fixed intermittently. The gap part of the absorptive main body 14 is joined in a line shape by heat sealing, and the diaper continuous body is formed by forming the joint part 8 on the diaper side edge.

[2-6] Production of pants-type disposable diapers:
Finally, a plurality of pants-type disposable diapers can be obtained by cutting the diaper continuous body at the joint 8 portion.

[3] Disposable diapers:
Disposable diaper manufactured by the manufacturing method of the present invention, for example, as a disposable diaper 1A shown in FIGS. 17 and 18, the absorber 22 is disposed so as to cover the surface of the absorbent body, at least a portion Includes a top sheet 18 made of a liquid-permeable material and a back sheet 20 arranged to cover the back surface of the absorbent body 22 and made of a liquid-impermeable material. Consists of each part of the body 6, the corresponding side edges of the front body 2 and the back body 6 are joined together, and one waist opening 10 and a pair of leg openings 12 (12a, 12b). An abdominal circumference elastic material 44 formed and disposed at a portion between the waist circumference opening 10 and the leg circumference opening 12 (12a, 12b). Is a disposable diaper that has been cut in the region overlapping with the arrangement region of the absorbent body 22.

Hereinafter, the disposable diaper is illustrated by the example of a two-piece-type and pants-type disposable diaper.

  In the present specification, the term “pants-type diaper” refers to joining by joining corresponding side edges of the front body 2 and the back body 6 like the disposable diaper 1B shown in FIGS. 17 and 18. It is assumed that the diaper is formed in a pants shape in which a portion 8, one waist opening 10 and a pair of leg openings 12a and 12b are formed.

  And the “two-piece type” means an absorbent main body 14 that functions to absorb and retain the excrement of the wearer (absorption / holding function) and a function (wearing function) that encapsulates the wearer's body. It shall consist of the exterior member 16 to bear, and shall mean the diaper of the type by which the absorptive main body 14 was arrange | positioned inside the exterior member 16. FIG. The absorptive main body 14 is a member provided with an absorber 22, a top sheet 18, and a back sheet 20 as components.

  In addition, in this specification, “front body” means a part that covers the abdomen (front of the body) of the wearer when a diaper is worn on the wearer, and “inseam” means that the wearer wears a diaper. When the wearer wears a diaper, the part covering the inseam of the wearer means the part covering the back side (back of the body) of the wearer.

[3-1] Various elastic materials:
In the disposable diaper, at least a belly stretchable material is disposed. Furthermore, it is preferable that an elastic material around the legs and an elastic material around the waist are arranged.

  The leg circumference elastic material is an elastic material arranged along the leg circumference opening. By arranging the leg-stretchable material, a gather (leg gather) rich in stretchability can be formed in the leg-surrounding opening. Therefore, it is difficult to form a gap around the leg, and urine leakage from the opening around the leg can be effectively prevented.

  The waist elastic material is an elastic material arranged along the waist opening. By arranging the elastic material around the waist, a gather (waist gather) rich in elasticity can be formed in the waist opening. This waist gather makes it difficult for gaps to be formed around the waist and prevents urine leakage from around the waist. In addition, the fit of the diaper to the wearer is improved, and the diaper is prevented from falling down.

  An abdominal circumference elastic material is an elastic material arrange | positioned in the part (namely, part equivalent to a wearer's abdominal circumference) between a waist circumference opening part and a leg circumference opening part. By arranging the elastic material around the abdomen, it is possible to form a gather (tammy gather) rich in elasticity around the abdomen of the wearer. This Tammy Gather, together with West Gather, can make the diaper fit and anti-slip effect even better.

  About these elastic materials, the structure similar to the opening part elastic material already described is employable. Then, after considering the degree of gather contraction and the like, the constituent material, the elongation rate of the material, the stretched state at the time of fixing, etc. may be determined.

The disposable diaper is cut in a region where the belly stretchable material overlaps the region where the absorber is disposed. Thus, by cutting the abdominal stretchable material in a region that overlaps the region where the absorbent body is disposed, it is possible to prevent a problem that the stretched force acts on the absorbent body and the absorbent body contracts. Therefore, it is excellent in fit and wearing feeling of the diaper. In addition to the belly stretchable material, cutting the leg stretchable material further improves this effect.

  For example, the disposable diaper 1A shown in FIG. 17 and FIG. 18 is configured such that the leg-around elastic material 40 and the belly-around elastic material 44 are placed in the arrangement region of the absorber 22 by the elastic material cutting roll 50A shown in FIGS. It is an example of the disposable diaper cut | disconnected in the area | region which overlaps. In this example, cutting marks 64a, 64b, and 64c corresponding to the cutting protrusions 52a, 52b, and 52c in the first roll 54A are formed.

  Further, the disposable diaper 1B shown in FIG. 19 and FIG. 20 is an area where the leg elastic member 40 and the belly elastic member 44 overlap the arrangement area of the absorber 22 by the elastic material cutting roll 50C shown in FIG. It is an example of the disposable diaper cut | disconnected in. In this example, cutting marks 64a, 64b, 64c, 64d, and 64e corresponding to the cutting protrusions 52a, 52b, 52c, 52d, and 52e in the first roll 54C are formed.

The said disposable diaper does not have a restriction | limiting in particular about another part, It can manufacture according to a conventionally well-known disposable diaper.

[3-2] Absorber:
The absorber is a member for absorbing and holding the wearer's urine. The absorber is made of an absorbent material because it needs to absorb and retain the wearer's urine and body fluid.

  Examples of the absorbent material constituting the absorber include conventionally known absorbent materials usually used for disposable diapers and other absorbent articles, such as fluff pulp, super absorbent polymer (Super Absorbent Polymer; hereinafter referred to as “SAP”). And a hydrophilic sheet. It is possible to use wood pulp or non-wood pulp defibrated as fluff pulp, sodium polyacrylate as SAP, tissue, absorbent paper, hydrophilized nonwoven fabric as hydrophilic sheet preferable.

  It is preferable that the absorber is interposed at least in part between the top sheet and the back sheet. Usually, the absorber is interposed between the top sheet and the back sheet by being sandwiched between the top sheet and the back sheet and sealing the peripheral edge thereof. Therefore, the flap part in which the absorber is not interposed is formed between the top sheet and the back sheet at the peripheral part of the absorber.

  Although there is no restriction | limiting in particular about the shape of an absorber, The shape used in the conventional disposable diaper and other absorbent articles, for example, a rectangular shape, an hourglass type, a gourd type, a T shape etc. can be mentioned.

[3-3] Top sheet:
A top sheet is a sheet | seat arrange | positioned so that the upper surface (surface located in a wearer's skin side at the time of mounting | wearing of a diaper) may be coat | covered. At least a part (all or a part) of the top sheet is made of a liquid-permeable material because the absorber disposed on the lower surface side needs to absorb the wearer's urine.

  Examples of the liquid permeable material constituting the top sheet include a woven fabric, a nonwoven fabric, and a porous film. Among these, it is preferable to use a non-woven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, or nylon and subjected to a hydrophilic treatment. The top sheet may be composed of a single sheet material, but may be composed of a plurality of sheet materials.

[3-4] Backsheet:
A back seat | sheet is a sheet | seat arrange | positioned so that the lower surface (surface located in a wearer's clothing side at the time of mounting | wearing of a diaper) may be coat | covered. The back sheet is made of a liquid-impermeable material because it is necessary to prevent the wearer's urine from leaking outside the diaper.

  Examples of the liquid-impermeable material constituting the backsheet include a liquid-impermeable film made of a resin such as polyethylene. Among these, a microporous polyethylene film is preferably used. This microporous polyethylene film has a large number of fine pores of 0.1 to several μm, and is liquid impervious but has moisture permeability, so that the inside of the diaper can be prevented from being steamed There is.

  Note that a sheet material (cover sheet) may be bonded to the outer surface of the back sheet. This cover sheet is used to reinforce the back sheet and improve the feel (tactile feeling) of the back sheet.

[3-5] Absorbent body:
In the two-piece type pants-type diaper, the top sheet, the back sheet, and the absorbent body are configured as one member called an “absorbent body” that is responsible for absorption and holding functions, and an exterior member manufactured separately from this A pants-type diaper is formed by joining. This absorbent main body has a structure in which a top sheet is disposed on the upper surface side of the absorbent body and a back sheet is disposed on the lower surface side, and the absorbent body is interposed between the top sheet and the back sheet.

  An absorptive main body is comprised by the size which covers at least the crotch part of a diaper. However, in order to ensure the effect of preventing leakage, it is preferable to have a size that covers not only the crotch part but also a part of the front body and the back body. The absorptive main body can be fixed to the exterior member using, for example, a hot melt adhesive.

[3-6] Exterior member:
The exterior member is a member having a mounting function for encapsulating the wearer's body, and specifically, is a sheet-like member that forms the front body, the crotch portion, and the back body.

  In the two-piece type pants-type diaper, the absorbent main body serves exclusively for the absorption / holding function of absorbing and holding the excrement of the wearer, so a liquid-impermeable material as a material constituting the exterior member There is no need to use. Examples of the material constituting the exterior member include a nonwoven fabric composed of synthetic fibers made of polyethylene, polypropylene, polyester, and other thermoplastic resins.

  And in order to fix an exterior member in the state which pinched | interposed the elastic material etc. around the leg, in many cases, it is comprised by bonding together 2 or more sheet | seat materials (it is comprised with a nonwoven fabric etc.). For example, the disposable diaper 1A shown in FIGS. 17 and 18 and the disposable diaper 1B shown in FIGS. 19 and 20 are configured such that the exterior member 16 is formed by laminating two sheet materials, and the legs are disposed between the layers of the sheet materials. This is an example in which the elastic material 40, the waist elastic material 42, and the belly elastic material 44 are sandwiched and fixed.

[3-7] Solid gather:
In order to prevent side leakage of urine excreted by the wearer, a three-dimensional gather may be provided. The three-dimensional gather is a member for preventing side leakage of the urine excreted by the wearer, and is a leak-proof wall configured to stand up three-dimensionally. By forming such a three-dimensional gather, urine is excreted on the top sheet, and even if the urine spreads through the top sheet, the three-dimensional gather becomes a breakwater, and from the opening around the leg of the diaper, etc. Leakage (so-called “lateral leakage”) can be effectively prevented.

  The structure of a three-dimensional gather can employ | adopt the structure used for the conventional disposable diaper and other absorbent articles. For example, a stretchable material (a three-dimensional gathered stretchable material) disposed on a part of the water-repellent sheet material and a sheet (gather) formed on the sheet material by the three-dimensional gathered stretchable material can be suitably used.

The stretchable material cutting roll of the present invention and the production method of the present invention can be suitably used for the production of disposable diapers in which the belly stretchable material is cut in a region that overlaps the region where the absorbent body is disposed . Further, the disposable diaper can be used for infants, or as an absorbent article for adults, such as elderly and disabled in need of care.

It is a schematic perspective view which shows one embodiment of the conventional disposable diaper, and is the figure which shows the state which looked at the conventional disposable diaper from the front. It is a schematic plan view which shows one Embodiment of the manufacturing method of the conventional disposable diaper. It is a schematic perspective view which shows another embodiment of the conventional disposable diaper, and is a figure which shows the state which looked at the conventional disposable diaper from the front. It is a schematic sectional drawing which shows typically one Embodiment of the manufacturing method of the disposable diaper of this invention. It is a schematic front view which shows one Embodiment of the elastic material cutting roll of this invention. It is a schematic perspective view which shows one Embodiment of the elastic material cutting roll of this invention, and is a figure which shows the elastic material cutting roll shown in FIG. It is a schematic plan view which shows the state which expand | deployed the disposable diaper manufactured using the elastic material cutting roll shown in FIG. It is a schematic perspective view which shows another embodiment of the elastic material cutting roll of this invention. It is a schematic plan view which shows the state which expand | deployed the disposable diaper manufactured using the elastic material cutting roll shown in FIG. It is a schematic perspective view which shows another embodiment of the elastic material cutting roll of this invention. It is a schematic plan view which shows the state which expand | deployed the disposable diaper manufactured using the elastic material cutting roll shown in FIG. It is a schematic perspective view which shows another embodiment of the elastic material cutting roll of this invention. It is a schematic plan view which shows the state which expand | deployed the disposable diaper manufactured using the elastic material cutting roll shown in FIG. It is a top view which shows an example of the cutting trace of the character shape formed with the elastic material cutting roll of this invention. It is a top view which shows another example of the cutting trace of the character shape formed with the elastic material cutting roll of this invention. It is a schematic plan view which shows one Embodiment of the manufacturing method of the disposable diaper of this invention. It is a front view which shows one Embodiment of the disposable diaper manufactured by the manufacturing method of this invention. It is a rear view of the disposable diaper shown in FIG. It is a front view which shows another embodiment of the disposable diaper manufactured by the manufacturing method of this invention. It is a rear view of the disposable diaper shown in FIG.

Explanation of symbols

1A, 1B, 100, 110: disposable diapers, 2: front body, 4: crotch, 6: back body, 8: joint, 10: waist opening, 12, 12a, 12b: leg opening, 14 : Absorbent body, 16: exterior member, 18: top sheet, 20: back sheet, 22: absorber, 24: hole, 26: three-dimensional gather, 40: elastic material around leg, 42: elastic material around waist, 44: Abdominal circumference elastic material, 49, 49a, 49b: sheet material, 50A, 50B, 50C, 50D: elastic material cutting roll, 52: cutting projection, 54A, 54B, 54C, 54D: first roll, 56a, 56b, 56c, 56d, 56e: Area, 58, 58a, 58b, 58c: Height adjustment mechanism, 60, 60a, 60b: Holding plate, 62: Screw, 64, 64a, 64b, 64c, 64d, 64e, 66, 8: cutting mark, 70: second roll.

Claims (8)

A first roll provided with a cutting protrusion, and a second roll arranged to face the first roll,
The first roll has a plurality of the cutting protrusions, and the cutting protrusions are divided into a plurality of regions divided along the rotation axis direction of the roll, and at least one of the plurality of regions is arranged. The region further includes a height adjustment mechanism for adjusting the height of the cutting protrusion disposed in the region ,
A screw hole capable of fixing a screw to the first roll is formed,
The plurality of cutting protrusions are attached to a block in which a through hole is formed,
The block is fixed to a region on at least both side edges of the first roll by a screw penetrating the through hole,
A frame-like pressing plate that presses the block against the roll;
Of the presser plates, the presser plate that presses the blocks fixed to the regions on both sides of the roll of the first roll includes two presser plates that are divided along the rotation axis direction of the roll at the center of the region. Configured,
The height adjusting mechanism is a stretchable material cutting roll having a structure in which a shim having a shape corresponding to each of two pressing plates is sandwiched between the block and the first roll. The elastic material cutting roll according to claim 1 , wherein the plurality of regions are arranged so as to be shifted in a circumferential direction of the roll. The stretchable material cutting roll according to claim 1 or 2 , wherein a plurality of the cutting protrusions are attached to each of the plurality of regions. The stretchable material cutting roll according to any one of claims 1 to 3 , wherein the cutting protrusion is capable of forming a cut mark having a character shape. An elastic material cutting step for cutting an elastic material fixed to a sheet material constituting a disposable diaper is provided,
The elastic material cutting step includes a first roll having a plurality of cutting protrusions, the cutting protrusions being divided along a rotation axis direction of the roll and divided into a plurality of regions, and the first roll. And sandwiching the sheet with the stretchable material between the second rolls arranged so as to face each other, and pressurizing to cut the stretchable material,
As the first roll, a screw hole capable of fixing a screw is formed, and the plurality of cutting projections are attached to a block in which a through hole is formed, and the block is at least rolled by a screw that penetrates the through hole. A holding plate that is fixed to a region on both side edges and that presses the block against the roll, and further includes a holding plate that presses the block fixed to the region on both sides of the first roll of the first roll. However, using the one composed of two pressing plates divided along the rotation axis direction of the roll at the center of the region,
The height of the arranged the cutting projections into the plurality of regions, in between the first roll block, by sandwiching a shim having a shape corresponding to each of the two pressing plates, at least the The manufacturing method of the disposable diaper which performs the said cutting | disconnection, after adjusting about the area | region of the roll both-sides edge side of a 1st roll . As the first roll, a plurality of the areas are arranged so as to be shifted toward the circumferential direction of the roll,
The manufacturing method of the disposable diaper of Claim 5 which cut | disconnects the said elastic material sequentially for every site | part corresponding to the said several area | region of the said 1st roll. As the first roll, a plurality of the cutting protrusions attached to each region of the plurality of regions,
The manufacturing method of the disposable diaper of Claim 5 or 6 which cut | disconnects the said expansion-contraction material with each of the said cutting | disconnection protrusion about each of the site | part corresponding to the said several area | region of the said 1st roll. As the first roll, one having a cutting projection capable of forming a character-shaped cutting trace,
The manufacturing method of the disposable diaper as described in any one of Claims 5-7 which forms the cut mark of a character shape in the said sheet | seat material while cut | disconnecting the said elastic material .

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