JP2015058061A - Cutting device of elastic flexible member and manufacturing method of disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably cut an elastic flexible member mounted to a sheet member.SOLUTION: A cutting device includes a cutter roll having a plurality of cutting projections 11 on a peripheral surface, and an anvil roll arranged to face the cutter roll. The plurality of cutting projections form one or a plurality of cutting projection groups 12 by being sequentially arranged side by side toward an oblique direction to the shaft direction and circumferential direction of the cutter roll. Thus the plurality of cutting projections included in the cutting projection group are arranged so as to sequentially hit a sheet member in accordance with the rotation of the cutter roller. At least a beginning cutting projection 11a, which hits the sheets member first, among the plurality of cutting projections included in the cutting projection group is formed short in length as compared to any other cutting projections 11b.

Description

  The present invention relates to a cutting device for cutting an elastic elastic member attached to a sheet member, and a method for manufacturing a disposable diaper using the cutting device. More specifically, the cutting device of the present invention partially cuts an elastic stretchable member that forms a gather in the abdomen portion of the disposable diaper, and the elastic stretchable member is not disposed in the abdomen portion of the disposable diaper. It is an apparatus used for the purpose of forming a stretchable region.

  Conventionally, disposable diapers used, for example, for infants and the elderly are known. There are various types of disposable diapers, for example, pants-type disposable diapers and tape-type disposable diapers are known. The pants-type disposable diaper is a type of disposable diaper in which both front and rear body side parts are joined in advance. As this pants-type disposable diaper, an integrated type in which an outer cover sheet is integrated from the front body to the back body is known. Moreover, as a pants-type disposable diaper, a cross-linked type in which an outer cover sheet is separated in the front body and the back body, and an absorbent main body is cross-linked between the front body exterior body and the back body exterior body is known. ing. Furthermore, the tape-type disposable diaper is a type of disposable diaper in which an adhesive tape is attached to both sides of the front body or the back body, and the front body and the back body are bonded using the adhesive tape when worn.

  For example, in a pants-type disposable diaper, it has been conventionally known that a plurality of abdominal circumference stretchable members are provided at positions corresponding to the circumference of the wearer's abdomen (for example, Patent Document 1). The stretchable member around the abdomen is fixed in an expanded state on the front and back of the disposable diaper. When the stretchable member around the abdomen contracts, a gathered belly around the abdomen of the disposable diaper is formed. Thus, it is said that by forming gathers around the abdomen, the fit of the disposable diaper is improved, and the sliding of the diaper can be effectively prevented. In addition, by forming an abdominal gather, there is also an advantage that the flexibility of the abdomen part of the disposable diaper is increased and the wearing feeling given to the wearer is improved.

  Furthermore, when providing a stretchable member around the abdomen in a disposable diaper, a technique is also known in which a part of the stretchable member around the abdomen is discontinuous in a region overlapping with the absorbent main body (for example, Patent Document 2). That is, generally, since it is necessary to absorb the liquid such as urine excreted by the wearer even in the portion around the abdomen of the disposable diaper, the absorptive main body is also arranged in the portion around the abdomen. However, if a stretchable member around the abdomen is provided in the area where the absorbent main body is disposed, the contraction force of the stretchable member around the abdomen may cause distortion in the entire disposable diaper, causing the absorbent main body to sway, There is a risk of slipping. Therefore, in the region that overlaps with the absorbent main body, by making the elastic member around the abdomen partially discontinuous, the elastic force of the elastic member around the abdomen does not act so that the disposable diaper or the absorbent main body can be distorted. Misalignment can be eliminated.

  Here, Patent Document 2 discloses a cutting device for cutting an elastic elastic member attached to a sheet member. This conventional cutting device has a simple process for cutting the elastic elastic member, has high productivity, and has been devised for reliably cutting a plurality of elastic elastic members. That is, the cutting device disclosed in Patent Document 2 includes a cutter roll provided with a cutting protrusion, and an anvil roll disposed so as to face the cutter roll. Between the cutter roll and the anvil roll, The elastic member is cut by sandwiching and pressing a sheet member provided with an elastic elastic member. Here, a plurality of blocks 13 ′ having a structure as shown in FIG. 6 are attached to the peripheral surface of the conventional cutter roll. As shown in FIG. 6, the block 13 ′ has a plurality of cutting protrusions 11 ′, and the plurality of cutting protrusions 11 ′ are not arranged so as to be aligned on a straight line parallel to the axial direction of the roll. And it arrange | positions sequentially so that it may align in the diagonal direction with respect to the axial direction of a roll, and the circumferential direction of a roll. The plurality of cutting protrusions 11 ′ are configured to sequentially contact the sheet member as the cutter roll rotates.

JP 2011-0050484 A JP 2008-229007 A

  Incidentally, as shown in FIG. 6, in the conventional cutting apparatus, all of the plurality of cutting protrusions 11 'are formed in an elongated shape and the same length. That is, in this conventional cutting device, a plurality of cutting protrusions 11 ′ are sequentially brought into contact with the sheet member, from the cutting protrusion 11a ′ that first contacts the sheet member to the cutting protrusion 11c ′ that finally contacts the sheet member, All of them have the same shape and the same length.

  However, when the elastic stretchable member attached to the sheet member is repeatedly cut using the above-described conventional cutting device, the elastic stretchable member can be basically cut without any problem, but the elastic stretchable member is not used. It was found that cutting occurs very rarely. This is because when the length of the cutting protrusion 11a ′ that first contacts the sheet member is long (the contact area is large), the pressure (linear pressure) applied to the first cutting protrusion becomes non-uniform. Guessed. That is, it has been found that when the linear pressure of the cutting protrusion 11a ′ becomes non-uniform, the possibility that the elastic elastic member will not break increases. Thus, in the conventional cutting device, there is a possibility that the elastic elastic member is not cut. For this reason, when this cutting device was used for the production of disposable diapers, there was a problem that the rate of non-defective diaper shipment was reduced.

  Further, when the elastic stretching member attached to the sheet member was repeatedly cut using the conventional cutting device, a spot where the cutting hole formed in the sheet member rarely became large was discovered. That is, the cutting hole is formed at a position where the cutting protrusion is in contact with the sheet member, and in particular, the cutting hole formed by the cutting protrusion 11a ′ that first contacts the sheet member is formed by another cutting protrusion. It has been found that there is a tendency to become larger holes that are wider than the cut holes that are made. When the cut hole formed in the sheet member is widened, there is a problem that the appearance of the disposable diaper is deteriorated or the sheet member is easily torn from the hole portion.

  Therefore, at present, it is a cutter roll in which a plurality of cutting protrusions are sequentially arranged so as to be arranged in an oblique direction, and the elastic elastic member attached to the sheet member can be more reliably cut, Therefore, there is a need for a technique capable of preventing the holes formed in the sheet member from expanding after cutting.

Therefore, as a result of intensive studies on the means for solving the above-described problems of the conventional invention, the inventor of the present invention, among the plurality of cutting projections provided on the cutter roll, the cutting projection that first hits the sheet member is replaced with another cutting projection. Finding that the linear pressure applied to the first cutting projection can always be made constant by forming it shorter than the projection, and that the cutting hole formed in the sheet member by the first cutting projection can be kept small. Got. The inventor has conceived that the problems of the prior art can be solved based on the above knowledge, and has completed the present invention.
More specifically, the present invention has the following configuration.

The first aspect of the present invention relates to a cutting device.
The cutting device of the present invention includes a cutter roll 10 having a plurality of cutting protrusions 11 on a peripheral surface, and an anvil roll 20 disposed so as to face the cutter roll 10. Accordingly, the cutting device according to the present invention sandwiches the sheet member to which the elastic elastic member is attached between the cutter roll 10 and the anvil roll 20, and presses and cuts the elastic elastic member by the cutting protrusion 11.
Here, the plurality of cutting protrusions 11 provided on the cutter roll 10 are sequentially arranged so as to be arranged in an oblique direction with respect to the axial direction and the circumferential direction of the cutter roll 10, so that one or more cuttings 11 A projection group 12 is formed. Accordingly, the plurality of cutting protrusions 11 included in the cutting protrusion group 12 are arranged so as to sequentially contact the sheet member as the cutter roll 10 rotates.
Of the plurality of cutting protrusions 11 included in the cutting protrusion group 12, at least the leading cutting protrusion 11a that first hits the sheet member is formed shorter than any of the other cutting protrusions 11b. Yes. For example, the length of the leading cutting protrusion 11a is preferably shorter than the cutting protrusion that hits the sheet member next to the leading cutting protrusion 11a.

As described above, the leading cutting protrusion 11a that first hits the sheet member is likely to have a non-uniform linear pressure, and the elastic stretchable member is likely to be unbroken. In this regard, as described above, the linear pressure applied to the leading cutting protrusion 11a can be made more uniform by shortening the length of the leading cutting protrusion 11a. Therefore, it is possible to prevent the elastic stretchable member that is hit by the leading cutting protrusion 11a from being unbroken.
Further, as described above, since the linear pressure applied to the leading cutting protrusion 11a is difficult to control, the cutting hole of the sheet member formed by the leading cutting protrusion 11a tends to expand and become large. In this regard, as described above, by reducing the length of the leading cutting protrusion 11a, it is possible to prevent the hole formed in the sheet member from being widened by the leading cutting protrusion 11a.
Thus, the cutting device of the present invention is an improvement over the conventional cutting device (Patent Document 2), and the effect of the improvement is highly effective in producing disposable diapers and the like.

  Further, in the cutting device of the present invention, among the plurality of cutting protrusions 11 belonging to the cutting protrusion group 12, the last cutting protrusion 11c that hits the sheet member lastly has a length compared to any of the other cutting protrusions 11b. Is preferably formed short. For example, it is preferable that the end cutting protrusion 11c has a shorter length than the cutting protrusion that hits the sheet member before the end cutting protrusion 11c.

  As in the above configuration, by shortening the length of the last cutting protrusion 11c that hits the sheet member lastly, for example, when the cutting protrusion is removed from the sheet member after the elastic elastic member attached to the sheet member has been cut. In addition, the sheet member can be prevented from being rolled or lifted. That is, if the length of the trailing cutting protrusion 11c is approximately the same as the length of the other cutting protrusions, an error occurs that the trailing cutting protrusion 11c is caught by the sheet member and lifted up when the trailing cutting protrusion 11c leaves the sheet member. There was something to do. In this regard, as described above, by shortening the length of the tail cutting protrusion 11c, the tail cutting protrusion 11c can be easily detached from the sheet member and can be prevented from being caught by the sheet member. Therefore, according to this invention, the error which arises in the process of cut | disconnecting a sheet | seat part can be reduced. In the end portion of the cutting projection group 12 as well, the pressure for pressing the sheet in the entire cutting projection group 12 is constant as in the head portion. For this reason, at the end of the cutting projection group 12, the pressure is concentrated on the end cutting projection 11c1 from the state where the pressure is received by the plurality of projections 12, and thus the substrate is likely to be cut. Therefore, it is preferable to shorten the length of the tail cutting protrusion 11c as well as the head cutting protrusion 11a.

  In the cutting device of the present invention, when the leading cutting protrusion 11a draws a virtual straight line passing through the leading cutting protrusion 11a along the circumferential direction of the cutter roll 10, the virtual straight line passing through the leading cutting protrusion 11a is In any case, it is preferable that the leading cutting protrusion 11a is configured to pass through a cutting protrusion that contacts the sheet member. That is, it is preferable that the leading cutting protrusion 11 a overlaps with the next cutting protrusion as a whole when viewed in the circumferential direction of the cutter roll 10.

  As described above, there is a higher possibility that the elastic elastic member to which the leading cutting projection 11a hits will be more continuous than the elastic elastic member to which the other cutting projection 11b hits. Here, in the present invention, the length of the leading cutting protrusion 11a is shortened to make the linear pressure uniform, thereby preventing the elastic elastic member from being cut. However, the elastic expanding and contracting member is attached only by the leading cutting protrusion 11a. When trying to cut, there is a slight possibility that the elastic elastic member will be unbroken. Therefore, as described above, the elastic elastic member to which the leading cutting protrusion 11a hits is also made to hit at least the next cutting protrusion, so that the elastic elastic member to which only the leading cutting protrusion 11a hits is eliminated. Is surely cut.

The 2nd side surface of this invention is related with the manufacturing method of a disposable diaper provided with the sheet | seat member to which the elastic elastic member was attached. In the manufacturing method of the disposable diaper which concerns on a 2nd side surface, in order to cut | disconnect the elastic elastic member attached to the sheet | seat member, the cutting device which concerns on the 1st side surface mentioned above is utilized.
That is, in the manufacturing method of the present invention, a sheet member to which an elastic expansion / contraction member is attached is sandwiched between the cutter roll 10 and the anvil roll 20 each having a plurality of cutting protrusions 11 on the peripheral surface, and the elastic expansion / contraction member is formed by the cutting protrusion 11. A step of cutting under pressure.
Here, the plurality of cutting protrusions 11 are sequentially arranged so as to be arranged obliquely with respect to the axial direction and the circumferential direction of the cutter roll 10, thereby forming one or a plurality of cutting protrusion groups 12. .
Further, the plurality of cutting protrusions 11 included in the cutting protrusion group 12 are arranged so as to sequentially contact the sheet member as the cutter roll 10 rotates.
Of the plurality of cutting protrusions 11 included in the cutting protrusion group 12, at least the leading cutting protrusion 11a that first hits the sheet member is formed shorter than any of the other cutting protrusions 11b. .

  According to the above process, it is possible to efficiently produce a disposable diaper by preventing the elastic elastic member from being unbroken.

  According to the present invention, it is possible to more reliably cut the elastic elastic member attached to the sheet member by using the cutter roll sequentially arranged so that the plurality of cutting protrusions are arranged in the oblique direction. Moreover, according to the present invention, it is possible to prevent the holes formed in the sheet member from expanding after cutting.

FIG. 1 is a perspective view showing an example of a disposable diaper that can be manufactured using the cutting device according to the present invention. FIG. 2 is a development view of the disposable diaper shown in FIG. FIG. 3 is a perspective view illustrating a part of the manufacturing process of the disposable diaper. FIG. 4 shows an example of the arrangement pattern of the cutting projections provided in the cutting device according to the present invention. FIG. 5 is an enlarged view of the arrangement pattern of the cutting protrusions shown in FIG. FIG. 6 shows an example of an arrangement pattern of cutting protrusions provided in a conventional cutting device.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. That is, the cutting device according to the present invention will be described with reference to an example in which the cutting device is used in the manufacturing process of a disposable diaper. However, the present invention is not limited to the embodiments described below, and includes those appropriately modified by those skilled in the art from the following embodiments.
Here, in the present specification, “A to B” means “A or more and B or less”.

  First, the outline | summary of the disposable diaper 200 manufactured using the cutting device which concerns on this invention is demonstrated. Specifically, the cutting device of the present invention can be suitably used when manufacturing a pants-type disposable diaper. In particular, in the following, a pants-type disposable diaper is an example of a disposable diaper in which an exterior sheet is separated between the front body and the back body, and an absorbent main body is bridged between the front body exterior body and the back body exterior body. Will be described. However, the cutting device of the present invention uses a pants-type disposable diaper in which the outer sheet is integrated from the front body to the back body, and adhesive tape is attached to both sides of the front body or the back body and is used when worn. And it can utilize suitably also for manufacture of the tape-type disposable diaper which adhere | attaches a front body and a back body.

  FIG. 1 is a schematic view showing an embodiment of a disposable diaper 200, and shows a state where the disposable diaper 200 is viewed from the front body exterior body 210 side. FIG. 2 is a development view of the disposable diaper 200 shown in FIG. 1, showing a state in which the disposable diaper 200 is viewed from the surface (skin facing surface) side facing the wearer's skin. In FIG. 2, various sheet members constituting the disposable diaper are transparently drawn in order to show the positional relationship of the elastic stretchable members arranged in various places.

  As shown in FIGS. 1 and 2, the disposable diaper 200 includes a front body exterior body 210, a rear body exterior body 220, and an absorbent main body 230. The front body exterior body 210 is located on the front body side that contacts the wearer's abdomen when worn, and the rear body exterior body 220 is located on the back body side that contacts the back of the wearer when worn. The absorbent main body 230 has one end side in the longitudinal direction fixed to the front body exterior body 210 and the other end side fixed between the rear body exterior body 220. For this reason, in this invention, the absorptive main body 230 is the state bridge | crosslinked between the front body exterior body 210 and the back body exterior body 220. FIG. As means for fixing the absorbent main body 230 to the front body exterior body 210 and the back body exterior body 220, known means can be used. For example, a hot melt adhesive or other fluid adhesive is used. It may be fixed by a fixing method, or may be fixed by heat welding such as heat sealing or ultrasonic welding.

  In addition, as shown in FIG. 1, the front body exterior body 210 and the back body exterior body 220 are joined to each other in the width direction so that the front body exterior body 210 and the back body exterior body 220 are connected in a ring shape. ing. For this reason, as shown in FIG. 1, a waist circumference opening 204 positioned around the wearer's waist when worn and a leg circumference opening 205 located around the wearer's leg when worn. In this way, a pants-type disposable diaper 200 is formed. The wearer puts both legs into the waist opening 204 so that the abdomen is in contact with the front body exterior body 210 and the back is in contact with the back body exterior body 220, and each leg is placed around the leg. The disposable diaper 200 can be attached by taking out from the opening 205.

  Further, as shown in FIG. 2, the disposable diaper 200 includes a waist circumference portion 201 in the vicinity of the edge forming the waist circumference opening 204, a crotch portion 203 located in the crotch of the wearer, and a waist circumference portion 201. It is divided into an abdominal area 202 located between the crotch 3. The waist circumference portion 201 is an area where a plurality of waist circumference elastic members 251 are arranged. Further, the abdominal circumference portion 202 is an area where a plurality of abdominal circumference elastic members 252 are arranged. Moreover, the absorptive main body 230 is arrange | positioned centering on the crotch part 203 and extended in the longitudinal direction of a disposable diaper. In addition, the waist part 201 means the area | region from the edge which forms the waist periphery opening part 204 to the position where the absorber 231 of the absorptive main body 230 exists, for example. It is preferable that at least the waist elastic member 251 disposed in the waist part 201 does not overlap with the absorbent body 231 of the absorbent main body 230.

  The front body exterior body 210 and the back body exterior body 220 are basically configured by overlapping an inner sheet 211 and an outer sheet 212. Between the inner sheet 211 and the outer sheet 212, a plurality of waist elastic members 251 and a plurality of belly elastic members 252 are arranged along the width direction of the disposable diaper.

  The inner sheet 211 is disposed on the skin facing surface side, and the outer sheet 212 is disposed on the skin non-facing surface side. The absorbent main body 230 is bonded to the inner sheet 211 by an adhesive such as a hot melt adhesive. And the outer sheet | seat 212 is return | folded by the skin contact surface side in the edge which forms the waist periphery opening part 4, and covers the edge part of the absorptive main body 230 from the skin contact surface side. For this reason, the absorbent main body 230 is partially located between the inner sheet 211 and the outer sheet 212. The absorbent main body 230 is fixed to the front body exterior body 210 and the back body exterior body 220 so as to be sandwiched between the inner sheet 211 and the outer sheet 212.

  The inner sheet 211 and the outer sheet 212 are formed by, for example, a flexible fiber nonwoven fabric, a plastic sheet, or a laminate sheet thereof. The inner sheet 211 and the outer sheet 212 are bonded by, for example, a hot melt adhesive. Further, between the inner sheet 211 and the outer sheet 212, a plurality of waist elastic members 251 and a plurality of belly elastic members 252 are fixed in an extended state along the width direction of the disposable diaper.

The waist elastic member 251 is disposed in an extended state along the vicinity of the edge of the waist opening 204 formed by the front body exterior body 210 and the back body exterior body 220, and contracts to retract the waist of the disposable diaper. This is a member for forming a waist gather in the vicinity of the opening 204.
The number of waist elastic members 251 is preferably two or more, and may be, for example, 2 to 15, 4 to 12, or 6 to 9. The plurality of waist elastic members 251 are arranged at predetermined intervals in the longitudinal direction of the disposable diaper, for example, as shown in FIG. The plurality of waist elastic members 251 are preferably juxtaposed substantially in parallel.

The abdominal circumference elastic member 252 is arranged in the stretched state in the width direction in the abdominal circumference portion 202 of the front body exterior body 210 and the back body exterior body 220, and contracts to the abdominal circumference portion 202 of the disposable diaper. It is a member for forming an abdominal gather.
As shown in FIG. 2, the plurality of abdominal circumference elastic members 252 are arranged in the abdominal circumference portion 202 where the absorbent body 31 of the absorbent main body 230 is located, of the front body exterior body 210 and the back body exterior body 220. ing. Further, the plurality of abdominal circumference elastic members 252 are fixed in an extended state between the inner sheet 211 and the outer sheet 212 constituting the front body exterior body 210 and the back body exterior body 220. Therefore, when the plurality of abdominal circumference elastic members 252 contract, an abdominal circumference gather is formed in the abdominal circumference portions 202 of the front body exterior body 210 and the back body exterior body 220.

  The number of the plurality of abdominal circumference elastic members 252 is preferably, for example, 10 to 30, 12 to 28, 15 to 25. The number of the abdomen elastic members 252 is preferably larger than the number of the plurality of waist elastic members 251 described above. Further, the abdominal circumference elastic member 252 is preferably formed linearly in the width direction of the front body exterior body 210 and the back body exterior body 220. Moreover, it is preferable that each of the plurality of abdominal circumference elastic members 252 is disposed substantially in parallel.

  As shown in FIG. 2, when the disposable diaper is viewed from the surface facing the wearer's skin (skin-facing surface), a part of the plurality of abdominal elastic members 252 are arranged so as to overlap with the absorbent main body 230. Has been. Of the plurality of abdominal circumference elastic members 252, the one that overlaps with the absorbent body 231 of the absorbent main body 230 is partially discontinuous at the center in the width direction of the front body exterior body 210 and the back body exterior body 220. Has been. Here, the abdominal circumference elastic member 252 is not a completely discontinuous region where the absorbent body 231 of the absorbent main body 230 overlaps, and the abdominal circumference elastic member 252 is partially formed by the absorbent main body 230. It may overlap with the absorber 231.

  In FIG. 2, reference signs C <b> 1 and C <b> 2 indicate cut marks of the abdominal circumference stretchable member 252 in the front body exterior body 210 and the back body exterior body 220. That is, for example, when forming the stretchable member 252 around the abdomen of the front body exterior body 210 discontinuously, the center part in the width direction becomes a non-adhesive region in the abdomen circumference part 202 of the outer sheet 212 of the front body exterior body 210, A plurality of stretched belly stretchable members 252 are fixed on the outer sheet 212 so that the left and right side portions are bonded portions. At this time, when the outer sheet 212 and the abdominal circumference elastic member 252 are fixed, for example, an adhesive may be applied on the outer sheet, and the abdominal circumference elastic member 252 may be disposed on the adhesive. Then, after applying the adhesive directly to the abdominal circumference elastic member 252 by a known slit coat coating method or the sure wrap coating method, the abdominal circumference elastic member 252 coated with the adhesive may be disposed on the outer sheet. Thereafter, the stretched belly stretchable member 252 is covered with the inner sheet 211 and sandwiched between the outer sheet 212 and the inner sheet 211. And the abdominal circumference elastic member 252 is cut | disconnected by the location shown with the code | symbol C1 in a non-bonding area | region. Thereby, the stretchable member 252 around the abdomen in the stretched state is released from the stretched state in the non-bonded region and contracts in the left-right direction from the cutting position. In this way, a disposable diaper in which the abdominal circumference elastic member 252 is discontinuous can be manufactured. In the present specification, the region where the abdominal circumference elastic member 252 is discontinuous is also referred to as an abdominal circumference elastic member discontinuous region 260.

  As the waist elastic member 251 and the abdominal elastic member 252, a known elastic elastic member can be used. For example, thread elastic rubber or flat elastic rubber can be used for the waist elastic member 51. As such a rubber material, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, or polyester can be used.

  Moreover, the absorptive main body 230 is hold | maintained in the bridge | crosslinking state between the front body exterior body 10 and the back body exterior body 20, and when wearing the disposable diaper 100, a wearer's abdominal circumference part 2 and crotch part 3 It is a member for absorbing and holding liquid such as urine excreted by the wearer. The absorbent main body 230 may have a known structure in which the absorber 231 that absorbs and holds the liquid is disposed between the liquid-permeable top sheet 232 and the liquid-impermeable back sheet 233.

  Then, the cutting device used for manufacture of the disposable diaper which has the said structure is demonstrated in detail. FIG. 3 schematically shows a part of the manufacturing process of the disposable diaper. In particular, FIG. 3 shows an outline of the apparatus centering on the elastic elastic member cutting apparatus 100 used in the manufacturing process of the disposable diaper. As shown in FIG. 3, the cutting device 100 according to the present invention basically includes a cutter roll 10 and an anvil roll 20. Further, an adhesive applicator 31, an elastic member guide roll 32, a turning roll 33, a smooth roll 34, and the like are disposed in front of the cutter roll 10 and the anvil roll 20.

  A part of the manufacturing process of the disposable diaper having the above configuration is executed by the manufacturing apparatus including these elements. Specifically, the cutting device 100 according to the present invention executes a step of intermittently cutting the abdominal circumference elastic member 252 sandwiched between the inner sheet 211 and the outer sheet 212 of the disposable diaper 200.

  First, a long outer sheet 212 having a predetermined width is fed out from a raw roll (not shown) and conveyed toward the downstream side of the apparatus. At this stage, the outer sheet 212 forming the front body exterior body 210 and the back body exterior body 220 of the disposable diaper may be integrated. The outer sheet 212 is conveyed to the adhesive application device 31 along the direction of the arrow in FIG. In the adhesive applicator 31, an adhesive is applied to one side of the outer sheet 212 (the side on which the inner sheet is adhered) to form a waist elastic member adhering region 31a and an abdominal elastic member adhering region 31b. Is done. Reference numeral 31a indicates an adhesive region to which the waist elastic member 251 is adhered later, and reference numeral 31b indicates an adhesive region to which the abdominal elastic member 252 is adhered later. The waist elastic member adhesion region 31a and the waist elastic member adhesion region 31b are provided on the front body side and the back body side, respectively.

  Here, the waist elastic member adhering region 31a is formed continuously along the flow direction of the outer sheet 212, whereas the belly elastic member adhering region 31b is predetermined in the flow direction of the outer sheet 212. Regular length and intermittently provided. For this reason, in the abdominal circumference elastic member adhesion region 31b, a space between two adjacent adhesion regions becomes a non-adhesion region 31c.

  In FIG. 3, when fixing the waist elastic member 251 and the abdominal elastic member 252 to the outer sheet 212, an adhesive is applied on the outer sheet 212 and various elastic members are arranged on the adhesive. An example is shown. However, in the present invention, for example, an adhesive is directly applied to the waist elastic member 251 and the abdominal elastic member 252 in advance by a known slit coat coating method or a sure wrap coating method. The applied waist elastic member 251 and abdominal elastic member 252 may be fixed to the outer sheet 212. At that time, an adhesive may be intermittently applied to the abdominal circumference elastic member 252.

  Subsequently, as shown in FIG. 3, an elastic member guide roll 32 is arranged on the downstream side of the adhesive application device 31. The telescopic member guide roll 32 is formed in a rotatable cylindrical shape, and is arranged so that the rotation axis is orthogonal to the conveying direction of the outer sheet 212. The elastic member guide roll 32 is disposed so that the peripheral surface thereof is in contact with the outer sheet 212. As a result, the elastic member guide roll 32 presses the waist elastic member 251 fed out from the elastic member roll (not shown) to the waist elastic member adhesion region 31a and attaches the waist elastic member 252 to the waist elastic member. Crimp to region 31b.

  3 shows an example in which the waist elastic member 251 and the abdominal elastic member 252 are simultaneously attached to the outer sheet 212 by the elastic member guide roll 32, the waist elastic member 251 and the abdominal elastic member 252 Each elastic member guide roll may be attached to the outer sheet 212 at another stage.

  Next, as shown in FIG. 3, a turning roll 33 and a smoothing roll 34 are arranged on the downstream side of the elastic member guide roll 32. Here, the inner sheet 211 fed out from a raw roll (not shown) covers the various elastic members 251 and 252 that are guided by the turning roll 33 and adhered to the outer sheet 212. Further, a smooth roll 34 that is rotatable so as to face the turning roll 33 is arranged on the side of the outer sheet 212 where the elastic member is not arranged. For this reason, the various elastic members 251 and 252 are stuck between the outer sheet 212 and the inner sheet 211 by pressing by the turning roll 33 and the smooth roll 34.

  A cutting device 100 according to the present invention is disposed further downstream of the turning roll 33 and the smooth roll 34. The cutting device 100 includes a rotatable cutter roll 10 and an anvil roll 20 that are arranged to face each other. The cutter roll 10 has one or a plurality of blocks 13 on its peripheral surface. A plurality of cutting projections 11 are formed on each of the blocks 13. On the other hand, the peripheral surface of the anvil roll 20 is a smooth surface. For this reason, by introducing an elastic elastic member sandwiched between the inner sheet 211 and the outer sheet 212 between the cutting protrusion 11 of the cutter roll 10 and the smooth surface of the anvil roll 20, the cutting protrusion 11 and the anvil roll 20 The elastic elastic member can be cut by pressing.

  Moreover, the conveyance speed of the exterior sheet | seat which bonded the outer sheet | seat 212 and the inner sheet | seat 211, and the rotational speed of the cutter roll 10 and the anvil roll 20 are synchronized. That is, the cutting protrusion 11 in the cutter roll 10 is opposed to the anvil roll 20, and at the same time, the non-bonding region 31 c of the abdominal circumference elastic member 252 is synchronized between the cutting protrusion 11 and the anvil roll 20. As a result, the abdomen stretchable member 252 is cut in the non-bonded region 31c by the pressing of the cutting protrusion 11 and the anvil roll 20.

  Both or one of the cutter roll 10 and the anvil roll 20 may be heated to a predetermined temperature by a heating device (not shown). For example, the heating temperature of the cutter roll 10 and / or the anvil roll 20 can be appropriately designed according to the material and number of the elastic members, the material of the exterior sheet, the conveyance speed of the exterior sheet, and the like. The heating temperature of each roll is preferably, for example, 80 to 250 ° C, particularly 100 to 150 ° C. By heating each roll in this way, it is possible to cut only the elastic elastic member (abdominal circumference elastic member 252) at a higher speed.

  Here, with reference to FIG.4 and FIG.5, the preferable shape and arrangement | positioning of the cutting protrusion 11 of the cutter roll 10 are demonstrated in detail. FIG. 4 is an enlarged plan view showing one block 13 attached to the peripheral surface of the cutter roll 10. FIG. 5 is an enlarged view showing the inside of the broken line frame shown in FIG. 4 and 5, the orthogonal coordinates of the XY axes are set. The X-axis direction represents the axial direction of the cutter roll, and the Y-axis direction represents the circumferential direction of the cutter roll. That is, “the axial direction of the cutter roll” is a direction in which the rotation axis of the cutter roll extends. The “circumferential direction of the cutter roll” is a direction that coincides with the rotation direction and the reverse rotation direction of the cutter roll.

  As shown in FIGS. 4 and 5, the block 13 has a plurality of cutting projections 11 obliquely with respect to the cutter roll axial direction (X-axis direction) and the cutter roll circumferential direction (Y-axis direction). It is arranged to line up. As a result, a plurality of cutting protrusions 11 are grouped together to form a cutting protrusion group 12. Here, “in the direction oblique to the axial direction of the cutter roll and the circumferential direction of the cutter roll” means that the plurality of cutting protrusions 11 are arranged in the rotational axis direction of the cutter roll roll and the rotational direction of the roll. It means that the direction has a predetermined inclination. That is, the plurality of cutting protrusions 11 are arranged in a direction that does not coincide with either the axial direction or the circumferential direction of the cutter roll.

  In addition, as long as the plurality of cutting protrusions 11 are arranged so as to be arranged obliquely with respect to the axial direction and the circumferential direction of the cutter roll, all the cutting protrusions 11 are arranged so as to be aligned in a straight line. There is no need. For example, in the form in which the plurality of cutting protrusions 11 are divided into the plurality of cutting protrusion groups 12, the angle at which the cutting protrusions 11 are arranged in each cutting protrusion group 12 may be different. For example, as shown in the perspective view of FIG. 3, a plurality of blocks 13 are attached to the peripheral surface of the cutter roll 10. Each block 13 is formed with a plurality of cutting protrusions 11. A plurality of cutting projection groups 12 form one cutting projection group 12 for each block 13. For example, the inclination of the cutting projection group 12 formed in one block 13 may be different from the inclination of the cutting projection group 12 formed in another block 13.

The enlarged view of FIG. 5, with respect to the axial direction of the cutter roll, the angle (acute angle side) of the tilt direction is inclined to the cutting projections 11 are arranged, it is indicated by reference numeral theta _1. The inclination angle theta ₁ direction cutting projections 11 are arranged, for example, 5 to 40 degrees, 10 degrees to 30 degrees, or is preferably 15 degrees to 20 degrees. In this way, the elastic protrusions 11 can be arranged without lowering the pressure (linear pressure) applied to the cutting protrusions 11 by inclining the cutting protrusions 11 arranged in a line in a predetermined angle with respect to the axial direction of the cutter roll. It becomes possible to cut.

  Thus, when the sheet member in which the elastic elastic member is attached between the cutter roll and the anvil roll is introduced because the direction in which the plurality of cutting protrusions 11 are arranged obliquely is inclined, As the cutter roll is rotated, the plurality of cutting protrusions 11 are sequentially hit. That is, the plurality of cutting protrusions 11 do not start to hit the sheet member at the same time, and the cutting protrusions 11 start to hit the sheet member in order. As described above, since the cutting protrusions 11 sequentially contact the sheet member as the cutter roll rotates, the pressing force of the cutter roll can be prevented from being dispersed, and the pressing force of the cutter roll sufficiently acts on the sheet member and the elastic member. Can be made. Therefore, the cutting protrusions 11 can be pressed uniformly against the sheet member, and the elastic member can be effectively cut.

  The shape of the cutting protrusion 11 is not particularly limited, but is preferably an elongated straight line as shown in FIGS. Note that “elongated” means, for example, that the length of the cutting protrusion is twice or more the width of the cutting protrusion. In addition, as the shape of the cutting protrusion 11, various shapes such as a curved shape, a rectangular shape, and an elliptical shape can be adopted.

  Moreover, it is preferable that the plurality of cutting protrusions 11 are arranged at regular intervals along an oblique direction in which the cutting protrusions 11 are arranged. That is, it is preferable that the intervals between the plurality of cutting protrusions 11 belonging to the cutting protrusion group 12 are all equal. However, the interval between the cutting protrusions 11 may vary.

Further, in the preferred embodiment shown in FIGS. 4 and 5, the plurality of cutting protrusions 11 are each formed in an elongated linear shape, and are inclined obliquely with respect to the axial direction and the circumferential direction of the cutter roll. ing. That is, it is preferable that each of the cutting protrusions 11 is inclined at a predetermined angle, and the inclination angles of the plurality of cutting protrusions 11 are all the same. In the enlarged view shown in FIG. 5, the inclination angle at which the cutting protrusion 11 is inclined with respect to the axial direction of the cutter roll is indicated by reference sign θ ₂ . Here, the inclination angle θ ₂ of the cutting protrusion 11 is an angle measured from the same direction as the inclination angle θ _{1 in the} direction in which the cutting protrusions 11 are arranged. For example, the inclination angle theta ₂ of the cutting projection 11 is 95 degrees to 175 degrees, 90 degrees to 170 degrees, or preferably 110 ° to 160 ° and particularly preferably is 135 degrees to 165 degrees.

  In a more preferred embodiment, as shown in FIGS. 4 and 5, when a virtual straight line passing through a certain cutting protrusion 11 is drawn along the circumferential direction (Y direction) of the cutter roll, a certain cutting protrusion 11 is formed. It is preferable that the imaginary straight line that passes through is configured to pass through at least one or more other cutting protrusions 11. That is, as shown in FIG. 4 and the like, it is preferable that the plurality of cutting protrusions 11 have an area overlapping with other adjacent cutting protrusions 11 in the circumferential direction (Y direction) of the cutter roll. For example, in the embodiment shown in FIGS. 4 and 5, an imaginary straight line extending in the circumferential direction (Y direction) of the cutter roll through a certain cutting protrusion 11 passes through the other two cutting protrusions 11. In addition, all the cutting projections 11 are arranged side by side. The virtual straight line extending in the circumferential direction (Y direction) of the cutter roll preferably passes through at least two cutting protrusions 11, may be three cutting protrusions 11, and passes through four or more cutting protrusions 11. It may be a thing.

  By arranging the plurality of cutting projections 11 as described above, the elastic elastic member extending along the circumferential direction (Y direction) of the cutter roll can be cut by the plurality of cutting projections 11. That is, the elastic elastic member extending along the circumferential direction (Y direction) of the cutter roll comes into contact with a plurality of elastic elastic members sequentially when introduced between the cutter roll and the anvil roll. Thereby, it can prevent more reliably that the elastic expansion-contraction member does not break.

  Further, as a characteristic configuration of the present invention, as shown in FIG. 4 and FIG. 5, among the cutting projection groups 12 formed by a plurality of cutting projections 11, a cutting projection (first cutting projection 11 a that first hits the sheet member). ) Is shorter than the other cutting projections 11b. That is, the cutting protrusion (leading cutting protrusion 11a) that first hits the sheet member is one of cutting protrusions positioned at both ends of the cutting protrusion group 12, and is determined according to the direction in which the cutter roll rotates.

  The other cutting protrusion 11b whose length is compared with the leading cutting protrusion 11a may be any of the cutting protrusions included in the same cutting protrusion group 12. However, the other cutting protrusion 11b whose length is compared with the leading cutting protrusion 11a is preferably a cutting protrusion other than the cutting protrusion (tail cutting protrusion 11c) which finally hits the sheet member. For example, the other cutting protrusion 11b whose length is compared with the leading cutting protrusion 11a may be a cutting protrusion that contacts the sheet member next to the leading cutting protrusion 11a. In particular, the leading cutting protrusion 11a is preferably shorter in length than all the cutting protrusions 11b except the trailing cutting protrusion 11c among the cutting protrusions included in the cutting protrusion group 12. .

  In the enlarged view of FIG. 5, the length of the leading cutting protrusion 11a is indicated by the symbol La. The length of the other cutting projection 11b is indicated by the symbol Lb. As shown in FIG. 5, the length La of the leading cutting protrusion 11a is shorter than the length Lb of the other cutting protrusion 11b. For example, the length La of the leading cutting protrusion 11a may be 10% to 90% when the length Lb of the other cutting protrusion 11b is 100%, and is 30% to 90%, 50% to 90%. Or 60% to 90%.

In this way, by shortening the length La of the leading cutting protrusion 11a, the line pressure applied to the leading cutting protrusion 11a can be made more uniform by shortening it compared to the length Lb of other cutting protrusions. Can do. Thereby, it is possible to prevent the elastic stretchable member hitting the leading cutting protrusion 11a from being unbroken.
Further, since it is difficult to control the linear pressure applied to the leading cutting protrusion 11a, the cutting hole of the sheet member formed by the leading cutting protrusion 11a tends to expand and become large. In this regard, as described above, by shortening the length of the leading cutting protrusion 11a, it is possible to prevent the hole formed in the sheet member from being widened by the leading cutting protrusion 11a.

Moreover, it is preferable that conditions other than the length of the head cutting protrusion 11a are the same as the other cutting protrusions 11b. For example, the top cutting projection 11a, as well as other cutting projection 11b, is preferably inclined at a predetermined inclination angle theta _2.

  Further, as shown in FIG. 5, it is assumed that a virtual straight line passing through the leading cutting protrusion 11a is drawn along the circumferential direction (Y-axis direction) of the cutter roll. At this time, it is preferable that any virtual straight line passing through the leading cutting protrusion 11a passes through the cutting protrusion that hits the sheet member next to the leading cutting protrusion 11a. That is, it is preferable that the leading cutting protrusion 11a overlaps with the next cutting protrusion as a whole in the circumferential direction of the cutter roll. Furthermore, as shown in FIG. 5, it is preferable that the virtual straight line passing through the leading cutting protrusion 11 a includes a path that also passes through the cutting protrusion corresponding to the sheet member next to the leading cutting protrusion 11 a.

  That is, the imaginary straight line extending in the circumferential direction of the cutter roll 10 through the leading cutting protrusion 11a means the extending direction of the elastic elastic member attached to the sheet member. For this reason, the elastic elastic member that hits the leading cutting projection 11a always hits the cutting projection next to the leading cutting projection 11a. Further, the elastic elastic member that hits the leading cutting protrusion 11a includes a member that hits the cutting protrusion next to the leading cutting protrusion 11a. Thus, in the preferable form of this invention, arrangement | positioning of several cutting protrusion is devised so that the elastic expansion-contraction member which only hits the head cutting protrusion 11a does not exist. That is, there is a higher possibility that the elastic elastic member to which the leading cutting projection 11a hits will be cut more than the elastic elastic member to which the other cutting projection 11b hits. Here, in the present invention, the length of the leading cutting protrusion 11a is shortened to make the linear pressure uniform, thereby preventing the elastic elastic member from being cut. However, the elastic expanding and contracting member is attached only by the leading cutting protrusion 11a. When trying to cut, there is a slight possibility that the elastic elastic member will be unbroken. Therefore, as described above, the elastic elastic member to which the leading cutting protrusion 11a hits is also made to hit at least the next cutting protrusion, so that the elastic elastic member to which only the leading cutting protrusion 11a hits is eliminated. It is surely cut.

  Further, as shown in FIG. 4, among the cutting projection groups 12 formed by the plurality of cutting projections 11, the cutting projection that finally hits the sheet member (tail cutting projection 11c) is similar to the leading cutting projection 11a. It is preferable that the length is shorter than the cutting protrusion 11b. For example, the length of the trailing cutting protrusion 11c may be 10% to 90%, 30% to 90%, 50% to 90%, or 60% to 90% as compared with the length of the other cutting protrusion 11b. % Is preferred. For example, the length of the tail cutting protrusion 11c may be equal to the length of the head cutting protrusion 11a.

Moreover, it is preferable that conditions other than the length of the tail cutting protrusion 11c are the same as the other cutting protrusions 11b. For example, end cutting projections 11c, like other cutting projection 11b, is preferably inclined at a predetermined inclination angle theta _2.

  For example, if the length of the trailing cutting protrusion 11c is approximately the same as the length of the other cutting protrusions, an error that the sheet member is pulled up by being caught by the sheet member when the trailing cutting protrusion 11c leaves the sheet member occurs. There was a thing. In this regard, as described above, by shortening the length of the tail cutting protrusion 11c, the tail cutting protrusion 11c can be easily detached from the sheet member, and after the elastic elastic member attached to the sheet member has been cut, the cutting is performed. When the protrusion is removed from the sheet member, the sheet member can be prevented from being rolled or lifted. Therefore, according to this invention, the error which arises in the process of cut | disconnecting a sheet | seat part can be reduced.

  FIG. 2 shows a development view of a disposable diaper in which the abdominal circumference elastic member 252 is cut by the cutter roll 10 having the plurality of cutting protrusions 11 shown in FIGS. 4 and 5. As shown in FIG. 2, reference C <b> 1 indicates a cutting trace of the cutter roll 10 formed on the front body side, and reference C <b> 2 indicates a cutting trace of the cutter roll 10 formed on the rear body side. As described above, by sequentially cutting the abdominal circumference elastic member 252 by the cutter roll 10, it becomes possible to cut each elastic member smoothly and smoothly without interruption.

  The outer sheet from which the elastic elastic member has been cut as described above is cut and molded by a known cutting means in an outer sheet cutting process (not shown), which is a process following the cutting of the elastic elastic member, and the front body of each leaf. It becomes the exterior body 210 and the back body exterior body 220. After that, the absorbent main body 230 manufactured in a separate process by known means is fixed to the skin facing surface side of the front body exterior body 210 and the back body exterior body 220 of each leaf. Thereby, a pants-type disposable diaper is manufactured. However, the manufacturing method using the cutting device of the present invention is not limited to the manufacturing of pants-type disposable diapers, and it is also possible to manufacture tape-type disposable diapers by adopting ordinary usage. is there.

  As mentioned above, in this specification, in order to express the content of this invention, embodiment of this invention was described, referring drawings. However, the present invention is not limited to the above-described embodiments, but includes modifications and improvements obvious to those skilled in the art based on the matters described in the present specification.

  The present invention relates to a cutting device or the like for cutting an elastic elastic member attached to a sheet member. Therefore, the present invention can be suitably used in the manufacturing industry of disposable diapers, for example.

DESCRIPTION OF SYMBOLS 10 ... Cutter roll 11 ... Cutting protrusion 11a ... Leading cutting protrusion 11b ... Other cutting protrusions 11c ... End cutting protrusion 12 ... Cutting protrusion group 13 ... Block 20 ... Anvil roll 31 ... Adhesive coating device 31a ... Waist elastic member adhesion area 31b ... Abdominal circumference elastic member adhesion region 31c ... Non-adhesion region 32 ... Elastic member guide roll 33 ... Turning roll 34 ... Smooth roll 100 ... Cutting device 200 ... Disposable diaper

Claims (4)

A cutter roll (10) having a plurality of cutting projections (11) on the peripheral surface;
An anvil roll (20) arranged to face the cutter roll (10),
A cutting device that sandwiches a sheet member to which an elastic elastic member is attached between the cutter roll (10) and the anvil roll (20), and presses and cuts the elastic elastic member by the cutting protrusion (11). And
The plurality of cutting protrusions (11) are sequentially arranged so as to be arranged in an oblique direction with respect to the axial direction and the circumferential direction of the cutter roll (10), thereby providing one or a plurality of cutting protrusion groups (12). Formed,
The plurality of cutting protrusions (11) included in the cutting protrusion group (12) are arranged so as to sequentially contact the sheet member according to the rotation of the cutter roll (10),
Among the plurality of cutting protrusions (11) included in the cutting protrusion group (12), at least the leading cutting protrusion (11a) that first hits the sheet member is compared with any of the other cutting protrusions (11b), A cutting device that is short in length. Further, among the plurality of cutting protrusions (11) belonging to the cutting protrusion group (12), the last cutting protrusion (11c) which hits the sheet member lastly is longer than any of the other cutting protrusions (11b). The cutting device according to claim 1, wherein the cutting device is formed short. The leading cutting protrusion (11a)
When a virtual straight line passing through the leading cutting protrusion (11a) is drawn along the circumferential direction of the cutter roll (10), any virtual straight line passing through the leading cutting protrusion (11a) The cutting device according to claim 1 or 2, wherein the cutting device is configured to pass through a cutting protrusion corresponding to the sheet member next to the leading cutting protrusion (11a). A method for manufacturing a disposable diaper comprising a sheet member to which an elastic elastic member is attached,
A sheet member to which the elastic elastic member is attached is sandwiched between a cutter roll (10) having a plurality of cutting protrusions (11) and an anvil roll (20) on the peripheral surface, and the elastic expansion and contraction is performed by the cutting protrusions (11). Including pressurizing and cutting the member,
The plurality of cutting protrusions (11) are sequentially arranged so as to be arranged in an oblique direction with respect to the axial direction and the circumferential direction of the cutter roll (10), thereby providing one or a plurality of cutting protrusion groups (12). Formed,
The plurality of cutting protrusions (11) included in the cutting protrusion group (12) are arranged so as to sequentially contact the sheet member according to the rotation of the cutter roll (10),
Among the plurality of cutting protrusions (11) belonging to the cutting protrusion group (12), at least the leading cutting protrusion (11a) that first hits the sheet member is longer than any of the other cutting protrusions (11b). A method for manufacturing disposable diapers that are short.

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