JP6384361B2 - Fastening tape manufacturing method, tape-type disposable diaper manufacturing method, fastening tape, and tape-type disposable diaper - Google Patents

Description

  The present invention relates to a method for producing a fastening tape attached to a tape-type disposable diaper.

  Conventionally, a tape-type disposable diaper is known as a disposable diaper that is attached to the wearer's crotch and absorbs and holds a liquid such as urine. In the tape-type disposable diaper, for example, a fastening tape is attached to the left and right side portions of the back body, and a landing tape is provided on the front body. The fastening tape and the landing tape can be mechanically coupled by, for example, a hook-and-loop fastener composed of a hook material (male member) and a loop material (female member). Generally, a hook material is attached to a fastening tape, and the surface of the landing tape is covered with a loop material. For this reason, it is possible to attach a disposable diaper to a wearer's body by fastening the fastening tape provided on the back body to the landing tape provided on the front body.

  Fastening tape is generally manufactured individually in the process of manufacturing a tape-type disposable diaper. For example, in the manufacturing process of the fastening tape, first, a belt-like long fastening sheet is joined along the longitudinal direction of the belt-like long base sheet to obtain a laminate of sheet members (joining). Process). Then, the obtained laminated body is cut | disconnected toward a longitudinal direction and divided into two (division | segmentation process). Finally, the divided laminate is cut at predetermined intervals in the width direction to obtain individual fastening tapes (separation process). The fastening tape manufactured as described above has a shape having a main body portion fixed to both side portions of the back body of the disposable diaper and a tip portion extending from the main body portion. Here, the outer edge of the front end portion of the fastening tape corresponds to the cutting site cut in the above dividing step. Further, the left and right side edges of the main body of the fastening tape correspond to the cut portions cut in the above-described cutting step. Fastening tapes are generally manufactured through these joining steps, dividing steps, and separating steps (for example, Patent Documents 1 to 3).

Japanese Patent Laid-Open No. 2000-093211 JP 2007-282893 A JP2013-027752A

  However, when the fastening tape is manufactured as described above, the obtained fastening tape has a problem that breakage or tearing is likely to occur from the cut site formed in the dividing step or the cutting step. In particular, the cutting site formed in the last cutting process was considered to be easily damaged or torn when the front body and the back body of a disposable diaper using a fastening tape were connected.

  That is, the cutting part formed in the last cutting process forms the main part of the fastening tape fixed to the back body of the disposable diaper. Here, when trying to connect the back body and the front body using the fastening tape, the wearer twists or bends the body of the fastening tape while grasping the tip of the fastening tape, and fastens the fastening body. Find an appropriate position to fasten the tape. For this reason, when a disposable diaper is worn, a large load is applied to the main body of the fastening tape. In particular, the left and right sides of the main body are relatively easy to break because they correspond to the cutting sites in the cutting process, and if a large force is applied momentarily here, damage or tearing occurs relatively easily. There was a problem that.

  Therefore, in order to prevent the main body of the fastening tape from being damaged or broken, the main body is formed of a plurality of sheet members, and the plurality of sheet members are joined to the main body. It is also possible to reinforce the part. However, if, for example, an adhesive or the like is entirely applied to the main body portion of the fastening tape, there is a risk that the touch of the main body portion is deteriorated or the hardness of the main body portion is increased and the wearer's skin is damaged.

  For this reason, at present, there is a demand for a technique capable of preventing the main body portion from being damaged or broken while maintaining the softness of the main body portion of the fastening tape.

  The inventors of the present invention have intensively studied the means for solving the problems of the prior art, and as a result, applied by heat embossing or heat sealing to the part where the separation line for individually separating the fastening tape is formed. It was decided to reinforce the cutting part of this separation line. Since the cutting site by the separation line corresponds to both side edges of the main body of the fastening tape, by reinforcing this, even if a load is applied to the main body when wearing a disposable diaper, The main body is less likely to break or tear. Further, by reinforcing only the both side edges of the main body of the fastening tape, the softness of the main body can be maintained. The inventors of the present invention have come up with the idea that based on such knowledge, the problems of the prior art can be solved, and the present invention has been completed. More specifically, the present invention has the following steps and configurations.

The 1st side surface of this invention is related with the manufacturing method of a fastening tape.
The method for manufacturing a fastening tape according to the first aspect includes a joining step, a dividing step, a separating step, and a reinforcing step.
The joining step is a step of obtaining one or a plurality of belt-like fastening sheets 12 along the longitudinal direction on one surface of the belt-like substrate sheet 11 to obtain a laminate 10 of sheet members. The laminate 10 may be a laminate in which not only the base sheet 11 and the fastening sheet 12 but also other sheet members are laminated.
The dividing step is a step of forming a central cutting line 20 extending in the longitudinal direction so as to divide the laminated body 10 into two in the width direction. The center cutting line 20 only needs to extend in the longitudinal direction, and may be, for example, a straight line or a wave shape. In addition, the center cutting line 20 may divide the laminated body 10 into two equally, and does not need to divide equally.
The cutting step is a step of obtaining an individual fastening tape 100 by forming a cutting line 30 extending in the width direction so as to be connected to the central cutting line 20. The separating line 30 only needs to extend in the width direction, and may be parallel to the width direction, or may be inclined at a predetermined angle with respect to the parallel line to the width direction.
The method for manufacturing a fastening tape according to the present invention further includes a reinforcing step before the separating step. The reinforcing step may be performed, for example, between the joining step and the dividing step, or may be performed between the dividing step and the separating step.
The reinforcement step is a step that is performed at least before the separation step, and is a step of forming the reinforcement portion 40 that presses or melts the laminated body 10 at a site where the separation line 30 is to be formed. For example, reinforcement by pressing can be realized by embossing. Further, the reinforcement by melting can be realized by applying a heat seal (heating seal) or a sonic seal (ultrasonic seal).
In the present invention, in the separation process, the separation line 30 is formed so as to at least partially overlap the reinforcing portion 40.

  As in the above process, before the separation step for forming the separation line 30 in the laminated body 10, a reinforcing portion 40 is formed on the laminated body 10 by pressing or melting, and is cut so as to overlap the reinforcing portion 40. A separation line 30 is formed. The fastening tape is apt to be damaged or broken at a portion corresponding to the separation line 30. By forming a reinforcing portion 40 around the separation line 30, the fastening tape is effectively reinforced. be able to. Furthermore, since the reinforcement part 40 reinforces only the circumference | surroundings of the separation line 30, it can prevent that the touch of the whole fastening tape worsens or hardness increases. Furthermore, when a cutter or the like for forming the separation line 30 comes into contact with the laminated body 10, fraying and fluffing may occur in the laminated body 10. This can prevent such fraying and fluffing. Therefore, according to the present invention, it is possible to effectively prevent the main body from being damaged or broken while maintaining the softness of the main body of the fastening tape.

  In the method for producing a fastening tape according to the present invention, the reinforcing step is preferably performed before the dividing step. That is, this reinforcing step is preferably performed between the joining step and the dividing step.

  Before forming the central cutting line 20 that divides the laminate 10 into left and right as in the above process, the reinforcing portion 40 is formed on the laminate 10 to form the central cutting line 20. Distortion and the like can be reduced. That is, when the laminated body 10 is formed of, for example, three or more sheet members, a shift occurs in the sheet member constituting the laminated body 10 when the central cutting line 20 is formed, and the central cutting line 20 is appropriate. There is a possibility that a distorted shape is not formed at the position. Therefore, the reinforcing portion 40 is formed at the stage before the central cutting line 20 and the sheet members constituting the laminated body 10 are firmly joined to each other, so that it is difficult to cause a deviation between these sheet members. As a result, the accuracy of the process of forming the central cutting line 20 can be increased.

  In the present invention, in the joining step, the fastening sheet 12 is joined to one surface of the substrate sheet 11 along the longitudinal direction, and the outer layer sheet 13 is joined to the other surface of the substrate sheet 11 along the longitudinal direction. It is preferable that it is the process of joining and obtaining the laminated body 10 of a sheet member. That is, the laminate 10 has a structure in which the fastening sheet 12 is bonded to one surface of the base sheet 11 and the outer layer sheet 13 is bonded to the other surface of the base sheet 11.

  When the outer layer sheet 13 is overlaid on the other surface of the base sheet 11 as in the above process, the manufactured fastening tape peels off the base sheet 11 and the outer layer sheet 13 particularly at the cutting line 30. There is a concern that it will end up. In this respect, when the base sheet 11 and the outer layer sheet 13 are overlapped as described above by forming the reinforcing portion 40 that presses or melts the laminated body 10 in the vicinity of the separation line 30 as in the present invention. Even if it exists, it can prevent effectively that both sheets peel in the cutting site vicinity.

  In the present invention, the separation step is preferably a step of forming the separation line 30 within the range of the reinforcing portion 40.

  As described above, by making the entire parting line 30 completely fit within the range of the reinforcing portion 40, it is possible to completely reinforce the cutting site of the laminate 10 by the parting line 30. For this reason, it is possible to prevent breakage or tearing at the cut portion of the laminate 10 and fraying or fluffing in the process of manufacturing the laminate 10.

Then, the modification of the manufacturing method of the fastening tape concerning this invention is demonstrated.
In a modification of the method for manufacturing the fastening tape, simultaneously with the above-described separation process, a reinforcement process may be performed in which a reinforcing portion 40 formed by pressing or melting the laminated body 10 is formed at a site where the separation line 30 is formed. For example, by providing a portion for forming the reinforcing portion 40 in the cutter for forming the separation line 30, the above-described reinforcing portion 40 can be formed simultaneously with cutting the laminated body 10 by this cutter. It becomes possible. In this way, it is also possible to form the separation line 30 and the reinforcing portion 40 at the same time. However, as in the above-described embodiment, it is preferable that the reinforcing portion 40 is formed in advance in the step before the separation line 30 is formed.

The 2nd side surface of this invention is related with the manufacturing method of a tape-type disposable diaper.
In the manufacturing method of the disposable diaper which concerns on a 2nd side surface, the fastening tape manufactured by the manufacturing method of the fastening tape which concerns on the 1st side surface mentioned above is utilized.
That is, the manufacturing method of the disposable diaper according to the present invention includes a step of attaching the fastening tape manufactured according to the above-described method so as to extend from the left and right side edges of the disposable diaper to the front body or the back body of the disposable diaper. Including.

The third aspect of the present invention relates to a fastening tape.
The fastening tape which concerns on this invention is a member attached so that it may extend from the right-and-left both sides edge of a disposable diaper with respect to the front body or back body of a tape type disposable diaper.
The fastening tape includes a main body part 110 fixed to the disposable diaper, a front end part 120 extending from the main body part 110, and a fastening sheet 12 provided on the front end part 120. Furthermore, the fastening tape has a reinforcing portion 40 formed by pressing or melting a sheet member constituting the main body 110 at both left and right edges of the main body 110.

The fourth aspect of the present invention relates to a tape-type disposable diaper.
The disposable diaper of this invention is attached so that the fastening tape which concerns on an above-mentioned 3rd side surface may be extended from the right-and-left both-sides edge of a front body or a back body.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that a damage | damage and tearing arise in this main-body part, maintaining the softness of the main-body part of a fastening tape.

FIG. 1 is a schematic diagram showing an outline of a manufacturing apparatus used in the method for manufacturing a fastening tape according to the first embodiment. FIG. 2 is a flowchart showing how the fastening tape is manufactured by the method for manufacturing a fastening tape according to the first embodiment. FIG. 3 shows an example of the configuration of a fastening tape and a tape-type disposable diaper. FIG. 4 is a schematic diagram showing an outline of a manufacturing apparatus used in the method for manufacturing a fastening tape according to the second embodiment. FIG. 5 is a flowchart showing how a fastening tape is manufactured by the method for manufacturing a fastening tape according to the second embodiment. FIG. 6 is a schematic view showing an outline of a manufacturing apparatus used in the method for manufacturing a fastening tape according to the third embodiment. FIG. 7 is a flowchart showing how a fastening tape is manufactured by the method for manufacturing a fastening tape according to the third embodiment. FIG. 8 is a flowchart showing how a fastening tape is manufactured by the method for manufacturing a fastening tape according to the fourth embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. This invention is not limited to the form demonstrated below, The thing suitably changed in the range obvious to those skilled in the art from the following forms is also included.

In the present specification, the “longitudinal direction” basically means the longitudinal direction of the strip-shaped laminate or the strip-shaped sheet member constituting the strip-shaped laminate. This “longitudinal direction” coincides with the transport direction of the strip-shaped laminate or the strip-shaped sheet member constituting the strip-shaped laminate. On the other hand, the “width direction” basically means a direction perpendicular to the longitudinal direction in a plane.
In the present specification, “A to B” means “A or more and B or less”.

[1. First Embodiment]
First, with reference to FIG.1 and FIG.2, 1st Embodiment of the manufacturing method of the fastening tape which concerns on this invention is described. FIG. 1 shows an outline of a manufacturing apparatus 200 used in the method for manufacturing a fastening tape according to the first embodiment of the present invention. FIG. 2 is a plan view of a laminate of sheet members constituting the fastening tape, and conceptually shows the manufacturing process of the fastening tape. The method for manufacturing a fastening tape according to the present invention basically includes a joining process, a reinforcing process, a dividing process, and a cutting process. Hereinafter, each process will be described in detail.

[1-1. Joining process]
As shown in FIG. 1, the manufacturing apparatus 200 has a plurality of unwinding rolls 211, 212, and 213 arranged upstream of the apparatus. These unwinding rolls are wound with a sheet member constituting the fastening tape 100, and rotate in a direction to send the wound sheet member downstream. In the present embodiment, the manufacturing apparatus 200 includes a first unwinding roll 211, a second unwinding roll 212, and a third unwinding roll 213.

  The first unwinding roll 211 is located between the second unwinding roll 212 and the third unwinding roll 213. The first unwinding roll 211 has a long belt-like base material sheet 11 wound around its peripheral surface. As the base material sheet 11, for example, a non-woven fabric having heat melting property can be used. Specifically, as the base material sheet 11, a known nonwoven fabric such as spunbond, SMS (spunbond / meltblown / spunbond), SMMS (spunbond / meltblown / meltblown / spunbond), card embossing, resin bond, etc. is adopted. can do. Examples of the constituent material of the nonwoven fabric include synthetic fibers made of polyolefin (polyethylene, polypropylene, etc.), polyester, aliphatic polyamide, and other thermoplastic resins.

  The second unwinding roll 212 is positioned above the first unwinding roll 211. The long unwinding sheet 12 is wound around the peripheral surface of the second unwinding roll 212. The fastening sheet 12 is formed of a material that can be fastened to the outer surface of the disposable diaper. For example, an example of the fastening sheet 12 is a hook sheet constituting a hook-and-loop fastener. The hook sheet (fastening sheet 12) is a sheet-like member including, for example, a film made of a synthetic resin and a number of protrusions (hooks) formed on one surface of the film. The base sheet 11 described above is bonded to one side of the film, and a number of protrusions are provided on the other side of the film. Examples of the large number of protrusions (hooks) include protrusions such as bowls, mushrooms, or bowls. In addition, as a hook sheet, a well-known convex member used for a planar fastener can be employed. In addition, as a material for the film and protrusions constituting the hook sheet, for example, synthetic fibers made of polyolefin (polyethylene, polypropylene, etc.), polyester, aliphatic polyamide, and other thermoplastic resins can be used. The material of the film and the protrusion may be the same or different. In addition to the hook sheet, for example, an adhesive tape having an adhesive layer may be employed as the fastening sheet 12.

  The third unwinding roll 213 is located below the first unwinding roll 211. The third unwinding roll 213 has a long belt-like outer layer sheet 13 wound around its peripheral surface. As the outer layer sheet 13, similarly to the base sheet 11 described above, a non-woven fabric having heat melting property can be used. In addition, as the outer layer sheet 13, a loop sheet constituting a hook-and-loop fastener may be adopted. The loop fastener loop sheet is mechanically engaged with the hook sheet described above. A loop sheet generally has a film and a loop material. One side of the film is joined to the base sheet 11 described above, and a loop material is disposed on the other side of the film. The film can be formed of a synthetic resin, and a loop-like fiber may be used as the loop material. Specifically, as the film, for example, polyolefin (polyethylene, polypropylene, etc.), polyester, aliphatic polyamide, or other thermoplastic resin films can be used.

  As shown in FIG. 1, a pair of upper and lower pinch rolls 220 are arranged on the apparatus downstream side of the first to third unwinding rolls 211, 212, and 213. The pinch roll 220 operates so as to sandwich the various sheet members 11, 12, and 13 drawn from the unwinding rolls 211, 212, and 213 and to convey them further to the apparatus downstream side. At this stage, the base sheet 11, the fastening sheet 12, and the outer layer sheet 13 are coated with a known hot-melt adhesive or the like and bonded together. Specifically, the fastening sheet 12 is joined to one surface (upper surface) of the base material sheet 11, and the outer layer sheet 13 is joined to the other surface (lower surface) of the base material sheet 11. Thus, the process of joining at least the fastening sheet 12 to the base sheet 11 is the “joining process”. As described above, in the joining step, the outer layer sheet 13 may be joined to the base sheet 11 in addition to the fastening sheet 12. Further, the “laminated body 10” is obtained by bonding at least the fastening sheet 12 to the base sheet 11. As described above, the laminate 10 may be a laminate in which the outer layer sheet 13 is laminated in addition to the base sheet 11 and the fastening sheet 12.

[1-2. Reinforcement process]
As shown in FIG. 1, a reinforcing device 230 is located on the device downstream side of the pinch roll 220. In the present embodiment, the reinforcing device 230 includes a reinforcing joining roll 231 and a plain roll 232 provided at positions facing each other with the laminated body 10 in between. For example, the reinforcing joining roll 231 has protrusions arranged in a predetermined pattern on its peripheral surface. Further, the peripheral surface of the plain roll 232 is formed as a smooth surface. And the protrusion part of the reinforcement joining roll 231 and the smooth surface of the plane roll 232 are mutually contacting. For this reason, by sandwiching the laminate 10 between the protrusions of the reinforcing bonding roll 231 and the smooth surface of the plain roll 232, the laminate 10 can be pressed with a pattern that matches the arrangement of the protrusions. In addition, both or one of the protrusions of the reinforcing bonding roll 231 and the smooth surface of the plain roll 232 may be heated. As described above, since the protrusions or the smooth surface is in a heated state, the laminated body 10 sandwiched and pressed between them melts the heat-meltable sheet member and binds to each other. Thus, in the laminated body 10, the portion pressed by the reinforcing device 230, the heated and melted portion, or the pressed and melted portion is the “reinforcing portion 40 in which the strength of the sheet member constituting the laminated body 10 is improved. "

  FIG. 2 shows an example of a pattern for forming the reinforcing portion 40 in the laminate 10. The reinforcing portion 40 is formed by partially pressing or heating and melting the laminated body 10. Specifically, as shown in FIG. 2, the stacked body 10 can be divided into a central region 10 </ b> C, a left region 10 </ b> L, and a right region 10 </ b> R in the width direction. The left region 10L is located on the left side in the width direction of the central region 10C, and the right region 10R is located on the right side in the width direction of the central region 10C. The central region 10C is a region where the fastening sheet 12 is arranged and a wavy central cutting line 20 described later is formed. Further, the left region 10L and the right region 10R are regions in which a separation line 30 is formed and a reinforcing portion 40 is formed at a site where the separation line 30 is to be formed, as will be described later.

  As shown in FIG. 2, the fastening sheet 12 is located only in the central region 10 </ b> C of the laminated body 10. That is, the fastening sheet 12 is bonded to the upper surface of the base sheet 11 along the longitudinal direction in the central region 10C. For this reason, the length (width) in the width direction of the fastening sheet 12 is shorter than the length (width) in the width direction of the base sheet 11. For example, the lateral width of the fastening sheet 12 may be 5 to 30% or 10 to 25% with respect to the lateral width of the base sheet 11. Although not shown in FIG. 2, the outer layer sheet 13 is entirely bonded to the lower surface of the base sheet 11. That is, the lateral width of the outer layer sheet 13 and the lateral width of the base sheet 11 are substantially the same width.

  On the other hand, as shown in FIG. 2, the reinforcing portion 40 is formed in the left region 10 </ b> L and the right region 10 </ b> R of the laminate 10 by the reinforcing device 230 described above. The reinforcing portion 40 is formed at a site where a separation line 30 for separating the individual fastening tape 100 from the laminate 10 is to be formed in the final step of the method for manufacturing the fastening tape. More specifically, the reinforcing portion 40 has a linear shape extending in the width direction in both the left region 10L and the right region 10R, and is formed intermittently at intervals in the longitudinal direction. In the example shown in FIG. 2, the reinforcing portion 40 has a linear shape extending in parallel with the width direction. Further, in both the left region 10L and the right region 10R, the interval (D) in the longitudinal direction where the reinforcing portion 40 is formed is set to be equal. However, as shown in FIG. 2, the reinforcing portions 40 located in the left region 10L and the reinforcing portions 40 located in the right region 10R are staggered in the longitudinal direction (offset). In other words, the reinforcing portion 40 located in the left region 10L and the reinforcing portion 40 located in the right region 10R are not aligned in the longitudinal direction. For example, the right portion is located between the reinforcing portions 40 located in the left region 10L. The reinforcing portion 40 located in the region 10R is provided.

  In the present embodiment, the base material sheet 11 and the outer layer sheet 13 are disposed so as to overlap in the left region 10L and the right region 10R of the laminate 10. For this reason, for example, when the laminated body 10 is pressed in the reinforcement part 40, the base material sheet 11 and the outer layer sheet | seat 13 will contact | adhere more by press. Further, for example, by heating and melting the laminated body 10 in the reinforcing portion 40, the base sheet 11 and the outer layer sheet 13 are melted and bonded together. However, in the present invention, the outer layer sheet 13 is an arbitrary constituent member. That is, the reinforcement part 40 may be formed by pressing or melting only the base sheet 11.

  Further, as shown in FIG. 2, the reinforcing portion 40 has a certain width (B) (the length of the reinforcing portion 40 in the longitudinal direction of the laminate 10). The width (B) of one reinforcing portion 40 is preferably, for example, 5 to 35%, 10 to 30%, or 15 to 25% with respect to the distance (D) in the longitudinal direction of the reinforcing portion 40. Specifically, the width (B) of the reinforcing portion 40 is preferably 3 to 20 mm, 4 to 15 mm, or 5 to 10 mm. In the final process of the method of manufacturing the fastening tape, the separation line 30 is formed so as to overlap with the reinforcing portion 40. However, by ensuring the width (B) of the reinforcing portion 40 to a certain extent, it is more reliable. The separating line 30 can be formed so as to overlap the reinforcing portion 40. On the other hand, since the reinforcing part 40 is a part formed by being pressed or melted with the laminated body 10, the touch is somewhat harder than other parts. For this reason, if the width (B) of the reinforcing portion 40 is too wide, the feel of the fastening tape is impaired. Therefore, the width (B) of the reinforcing portion 40 is preferably 3 to 20 mm, and particularly preferably 5 to 10 mm.

  Further, as described above, in each of the left region 10L and the right region 10R, the reinforcing portions 40 are formed intermittently at intervals in the longitudinal direction. That is, there is a region where the reinforcing portion 40 does not exist between the reinforcing portion 40 and the reinforcing portion 40. For example, the distance (D) in the longitudinal direction between the reinforcing portions 40 is preferably 20 to 100 mm, or 30 to 80 mm. Thus, it is preferable to provide the reinforcement part 40 locally only in the site | part which is easy to produce a breakage | damage and tearing at the time of use of a fastening tape, for example, at intervals of about 20-100 mm. As a result, the feel of the fastening tape can be kept soft. Note that the distance (D) in the longitudinal direction of the reinforcing portion 40 here is the distance from the center of the width of a certain reinforcing portion 40 to the center of the width of the reinforcing portion 40 adjacent thereto, as shown in FIG. I mean.

  Moreover, in FIG. 2, the length (L) of the reinforcement part 40 (length of the reinforcement part 40 in the width direction of the laminated body 10) is shown. The length (L) of the reinforcing portion 40 can be designed as appropriate. Basically, the length (L) of the reinforcing portion 40 extends over the entire length of the separation line 30 to be formed later. It is preferable. For example, the length (L) of the reinforcing portion 40 and the length of the separating line 30 may be made equal.

  As described above, the step of forming the reinforcing portion 40 at a site where the separation line 30 is to be formed later in each of the left region 10L and the right region 10R of the laminate 10 is a “reinforcing step”. In the present embodiment, this reinforcing step is performed at a stage before the central cutting line 20 is formed in the laminate 10.

[1-3. Division process]
As shown in FIG. 1, a cutting device 240 is located on the downstream side of the reinforcing device 230. In the present embodiment, the cutting device 240 includes an ultrasonic vibration device 241 and a cutter roll 242 provided at positions facing each other with the laminate 10 interposed therebetween. For example, the ultrasonic vibration device 241 has an ultrasonic horn in contact with the laminate 10, and this ultrasonic horn vibrates in resonance with the ultrasonic vibration and applies the vibration energy to the laminate 10. The cutter roll 242 is a drum-like device that rotates in a direction in which the laminated body 10 can be conveyed toward the downstream side of the device. The cutter roll 242 sandwiches the sheet in cooperation with the ultrasonic vibration device 241 and The sheet is melted using frictional heat generated by rubbing. A protruding cutting blade portion is formed on the surface of the peripheral side surface of the cutter roll 242. For this reason, the center cutting line 20 is formed in the laminated body 10 according to the shape of the cutting blade part of the cutter roll 242. That is, the laminated body 10 passes in a pressed state between the ultrasonic horn of the ultrasonic vibration device 241 and the cutting blade portion of the cutter roll 242 so that a continuous central cutting line 20 is formed in the laminated body 10. It has become.

  FIG. 2 shows a state in which the central cutting line 20 is continuously formed along the longitudinal direction of the laminate 10. As shown in FIG. 2, the central cutting line 20 is formed in the central region 10 </ b> C of the stacked body 10. For this reason, the laminated body 10 is divided into two on the left and right sides in the width direction by the center cutting line 20. In the present embodiment, the center cutting line 20 has a wave shape extending in the longitudinal direction of the stacked body 10. In particular, as shown in FIG. 2, the wavy central cutting line 20 extends in the left-right direction in the width direction so as to cross the fastening sheet 12 disposed in the central region 10 </ b> C of the laminate 10 with a predetermined period. The amplitude is repeated. As shown in FIG. 2, the wavelength (λ) of the corrugated central cutting line 20 basically matches the longitudinal distance (D) of the reinforcing portion 40. Further, the wavy central cutting line 20 repeats the amplitude such that the peak of the amplitude alternately coincides with the reinforcing portion 40 located in the left region 10L and the reinforcing portion 40 located in the right region 10R. In the embodiment shown in FIG. 2, the central cutting line 20 has a wave shape. However, the central cutting line 20 may have, for example, a zigzag shape or a linear shape extending in parallel with the longitudinal direction. May be.

  Thus, the process of forming the central cutting line 20 extending in the longitudinal direction so as to divide the laminated body 10 into two in the width direction left and right by the cutting device 240 is a “dividing process”. In the present embodiment, the dividing step for forming the central cutting line 20 is performed after the reinforcing step for forming the reinforcing portion 40. When the central cutting line 20 is formed by forming the reinforcing portion 40 in the laminated body 10 before forming the central cutting line 20 that divides the laminated body 10 into left and right as in the present embodiment. Can be reduced. That is, when the laminated body 10 is formed of, for example, three or more sheet members, a shift occurs in the sheet member constituting the laminated body 10 when the central cutting line 20 is formed, and the central cutting line 20 is appropriate. There is a possibility that a distorted shape is not formed at the position. Therefore, the reinforcing portion 40 is formed at the stage before the central cutting line 20 and the sheet members constituting the laminated body 10 are firmly joined to each other, so that it is difficult to cause a deviation between these sheet members. As a result, the accuracy of the process of forming the central cutting line 20 can be increased.

[1-4. Separation process]
As shown in FIG. 1, a cutting device 250 is located on the downstream side of the cutting device 240. In the present embodiment, the cutting device 250 includes a conveyor 251 and a cutter 252. As shown in FIG. 1, the laminate 10 divided by the cutting device 240 is placed on a conveyor 251 having a flat surface. The conveyor 251 conveys the divided laminated body 10 further downstream of the apparatus. Further, a cutter 252 is disposed on the downstream side of the conveyor 251. This cutter 252 advances and retreats up and down with respect to the conveyor 251, and forms a separation line 30 in the laminated body 10 conveyed by the conveyor 251 so as to be separated individually. Thereby, the some fastening tape 100 can be obtained from the elongate strip-shaped laminated body 10. FIG.

  As shown in FIG. 2, the separation line 30 is formed so as to extend in the width direction of the stacked body 10, and the separation line 30 is connected to the central cutting line 20. At this time, the separation line 30 is formed so as to overlap with the reinforcing portion 40 provided in advance of the stacked body 10. In other words, in the present embodiment, the reinforcing portion 40 is formed in a straight line parallel to the width direction so that the separation line 30 also overlaps the reinforcing portion 40. Moreover, it is preferable that the entire separation line 30 is within the range of the reinforcing portion 40. In this manner, by forming the separation line 30 so as to overlap with the reinforcing portion 40, fraying and fuzz generated on the cut surface of the separation line 30 can be minimized.

  As shown in FIG. 2, the individual fastening tape 100 is separated from the laminated body 10 by forming the separation line 30. In this way, the process of forming the separation line 30 so as to overlap the reinforcing portion 40 is the “separation process”.

  Further, as shown in FIG. 1, for example, an imaging control device 260 may be provided between the cutting device 240 and the cutting device 250. The imaging control device 260 images the pattern (position) of the plurality of reinforcing portions 40 and the central cutting line 20 formed on the laminate 10, analyzes the captured image, and uses the analysis result to control the manufacturing apparatus 200. To reflect. For example, in the present embodiment, as described above, the position where the reinforcing portion 40 is formed and the top of the amplitude of the corrugated central cutting line 20 need to be accurately matched. Therefore, the imaging control device 260 images the laminate 10 and analyzes the position of the reinforcing portion 40 and the position of the top of the amplitude of the central cutting line 20 from the captured image. If the positions of the reinforcing portion 40 and the central cutting line 20 do not match, the imaging control device 260 feeds back the analysis result to the reinforcing device 230 and the cutting device 240 so that these positions match correctly. The rotation speed (conveyance speed) and the like are controlled so that Further, the imaging control device 260 may temporarily stop the entire manufacturing apparatus 200 when the positions of the reinforcing portion 40 and the central cutting line 20 do not match. Further, for example, in the present embodiment, as described above, it is necessary to accurately match the position where the reinforcing portion 40 is formed and the position where the separation line 30 is formed. Therefore, the imaging control device 260 captures the laminated body 10, analyzes the position of the reinforcing portion 40 from the captured image, and accurately grasps the position of the reinforcing portion 40. The imaging control device 260 feeds forward the analysis result to the cutting device 250 and controls the conveyance speed of the conveyor 251 and the cutting timing of the cutter 252 so that the separation line 30 can be correctly superimposed on the reinforcing portion 40. To do. Thus, by providing the imaging control device 260, the fastening tape can be more accurately manufactured by the manufacturing device 200. However, the imaging control device 260 has an arbitrary configuration.

[1-5. Fastening tape and tape-type disposable diaper]
FIG. 3 shows an example of a fastening tape 100 obtained by the above-described manufacturing method and manufacturing apparatus, and a tape-type disposable diaper 300 to which the fastening tape 100 is attached. The fastening tape 100 of the type shown in FIG. 3 is mainly used for disposable diapers for adults.

  FIG. 3A is a perspective view in which the fastening tape 100 is drawn separately for each sheet member. As shown in FIG. 3A, the fastening tape 100 has a configuration in which the fastening sheet 12 is bonded to one surface of the base sheet 11 and the outer layer sheet 13 is bonded to the other surface of the base sheet 11. . The base material sheet 11 constituting the fastening tape 100 has a wide main body 110 fixed to a disposable diaper, and a narrow tip 120 extending from the main body 110. The outer layer sheet 13 is also configured in the same shape as the base sheet 11. Further, the fastening sheet 12 is attached to the front end portion 120 of the base sheet 11.

  As can be seen from FIG. 2 and FIG. 3, the outer edge of the front end 120 of the fastening tape 100 corresponds to the cut surface of the central cutting line 20 described above. Further, the outer edges on both the left and right sides of the main body 110 in the fastening tape 100 correspond to the cut surfaces of the above-described separation line 30. For this reason, the reinforcement part 40 for reinforcing the cut surface of the separating line 30 exists in the vicinity of the outer edges on both the left and right sides of the main body part 110. The reinforcing portion 40 is formed by pressing or heating and melting portions corresponding to the vicinity of the outer edges on both the left and right sides of the main body portion 110. In the reinforcing portion 40, the strength of the sheet member is improved. Further, in this embodiment, since the outer layer sheet 13 is bonded to the entire other surface of the base sheet 11, the base sheet 11 and the outer layer sheet 13 are melted by heating and melting in the reinforcing portion 40. You will wear it.

  FIG.3 (b) is the front view which looked at the tape-type disposable diaper 300 to which the fastening tape 100 was attached from the front body side. Fastening tapes 100 are attached to the rear body of the tape-type disposable diaper 300 so as to protrude from the left and right side edges. As for each fastening tape 100, the main-body part 110 is fixed to the back body of a disposable diaper, and the front-end | tip part 120 is extended from the right-and-left both sides of a disposable diaper. On the other hand, a landing tape 310 for fastening the fastening tape 100 is provided on the outer surface side of the front body of the disposable diaper. The landing tape 310 is made of, for example, a loop material of a hook-and-loop fastener, and is engaged with the fastening sheet 12 provided at the front end portion 120 of the fastening tape 100. For this reason, the tape-type disposable diaper 300 can be worn by the wearer by engaging the fastening sheet 12 of the fastening tape 100 attached to the back body with the landing tape 310 provided on the front body. Is possible. In addition, about the form of the tape-type disposable diaper 300, it is not limited to the form illustrated in FIG.3 (b), The well-known form at the time of this-application application is employable. For example, in FIG. 3B, two fastening tapes 100 are attached to the left and right, but the fastening tape 100 may be provided in pairs of left and right, or provided in three or more pairs on the left and right. It may be.

  As shown in FIG. 3B, when trying to connect the back body and the front body using the fastening tape 100, the wearer grips the fastening tape 100 while grasping the front end portion 120 of the fastening tape 100. The main body 110 is twisted or bent. For this reason, a large load is applied to the main body 110 of the fastening tape 100 when the disposable diaper is worn. In particular, since the left and right side edges of the main body 110 correspond to the cut surface of the separation line 30, it is relatively easy to break, and if a large force is momentarily applied thereto, it is relatively easy to break or break. Will occur. As described above, the fastening tape 100 is likely to be damaged or torn at a portion corresponding to the separation line 30. Therefore, as in the present invention, the fastening tape 100 can be effectively reinforced by forming the reinforcing portions 40 around the separation line 30, that is, on both the left and right sides of the main body 110 of the fastening tape 100. . Furthermore, since the reinforcement part 40 reinforces only the circumference | surroundings of the separation line 30, it can prevent that the touch of the whole fastening tape deteriorates or hardness increases. Therefore, according to the present invention, it is possible to effectively prevent the main body 110 from being damaged or broken while maintaining the softness of the main body 110 of the fastening tape 100.

[2. Second Embodiment]
Next, a second embodiment of the method for manufacturing a fastening tape according to the present invention will be described with reference to FIG. FIG. 4 shows an outline of a manufacturing apparatus 200 used in the method for manufacturing a fastening tape according to the second embodiment of the present invention. FIG. 5 is a plan view of a laminate of sheet members constituting the fastening tape, and conceptually shows the manufacturing process of the fastening tape.

  As shown in FIG. 4, in the second embodiment, unlike the first embodiment, between the cutting device 240 for forming the central cutting line 20 and the cutting device 250 for forming the separation line 30. In addition, a reinforcing device 230 for forming the reinforcing portion 40 is disposed. For this reason, as shown in FIG. 5, the central cutting line 20 is first formed in the laminate 10, and the reinforcing portion 40 is formed in the subsequent process. Finally, a separation line 30 is formed so as to overlap the reinforcing portion 40. As described above, the reinforcing step for forming the reinforcing portion 40 may be performed between the dividing step for forming the central cutting line 20 and the separating step for forming the separation line 30. For other configurations and processes, the second embodiment is the same as the first embodiment.

[3. Third Embodiment]
Subsequently, a third embodiment of the method for manufacturing a fastening tape according to the present invention will be described with reference to FIGS. FIG. 6 shows an outline of a manufacturing apparatus 200 used in the method for manufacturing a fastening tape according to the third embodiment of the present invention. FIG. 7 is a plan view of a laminate of sheet members constituting the fastening tape, and conceptually shows the manufacturing process of the fastening tape.

  As shown in FIGS. 6 and 7, first, the base sheet 11, the fastening sheet 12, and the outer layer sheet 13 are pulled out from the first to third unwinding rolls 211, 212, and 213, respectively. Are overlapped and joined in the pinch roll 220 (joining step). Thereby, the laminated body 10 in which the fastening sheet 12 is bonded to one surface of the base material sheet 11 and the outer layer sheet 13 is bonded to the other surface of the base material sheet 11 is formed. The laminated body 10 advances to the apparatus downstream side and is introduced into the cutting apparatus 240. The cutting device 240 sandwiches and cuts the laminate 10 by the ultrasonic vibration device 241 and the cutter roll 242, and forms a central cutting line 20 extending in the longitudinal direction so as to divide the laminate 10 into two in the width direction (left and right) ( Dividing step). The divided laminated body 10 advances to the apparatus downstream side and is introduced into the cutting apparatus 250. The cutting device 250 forms the separating lines 30 extending in the width direction with respect to the laminated body 10 at predetermined intervals by the cutter 252 while conveying the laminated body 10 by the conveyor 251. Thereby, the individual fastening tape 100 is obtained from the strip | belt-shaped laminated body 10 (separation process). Here, as shown in FIG. 6 and FIG. 7, in the third embodiment, the cut line 30 is formed on the laminated body 10 by the cutter 252, and at the same time, the laminated body is formed at the site where the cut line 30 is formed. The reinforcement part 40 which pressed or fuse | melted 10 is formed (reinforcement process). Thus, in the third embodiment, the separation step for forming the separation line 30 and the reinforcement step for forming the reinforcing portion 40 are performed substantially simultaneously.

  More specifically, FIG. 6 shows an enlarged view of the cutter 252 used in the cutting process. As shown in FIG. 6, for example, the cutter 252 has a cutting blade 252a for forming the separation line 30 in the laminate 10, and a flat surface 252b formed around the cutting blade 252a. . The cutting blade 252a of the cutter 252 can be cut by being pressed against the laminate 10. Further, the flat surface 252b of the cutter 252 is formed at a position one step lower than the cutting blade 252a. The flat surface 252b contacts the laminated body 10 together with the cutting blade 252a in a state where the cutting blade 252a is in contact with the laminated body 10, and presses the laminated body 10 within a predetermined range. That is, the separation line 30 is formed at the location cut by the cutting blade 252a, and at the same time, the reinforcing portion 40 is formed at the location pressed by the flat surface 252b. As a result, the reinforcing portion 40 is formed around the separation line 30.

  Moreover, it is preferable that at least the flat surface 252b of the cutter 252 is heated. Moreover, the cutter 252 may have the cutting blade 252a heated together with the flat surface 252b. Thus, when the flat surface 252b of the cutter 252 is heated, when the flat surface 252b comes into contact with the laminated body 10, heat is transmitted to the laminated body 10, and the laminated body 10 is partially melted. To do. Thereby, in the reinforcement part 40 of the laminated body 10 formed of the flat surface 252b, the sheet | seat member which comprises the laminated body 10 will fuse | melt.

  As described above, it is possible to form the separating line 30 with respect to the stacked body 10 by using the cutter 252 and simultaneously form the reinforcing portion 40 around the separating line 30. In addition, about another structure and process, 3rd Embodiment is the same as that of 1st Embodiment.

[4. Fourth Embodiment]
Then, with reference to FIG. 8, 4th Embodiment of the manufacturing method of the fastening tape which concerns on this invention is described. FIG. 8 is a plan view of a laminate of sheet members constituting the fastening tape, and conceptually shows the manufacturing process of the fastening tape. The disposable diaper manufactured by embodiment shown in FIG. 8 is mainly used for the disposable diaper for children.

[4-1. Joining process]
As shown in FIG. 8, two belt-like fastening sheets 12 a and 12 b are joined to one side of the long base sheet 11 along the longitudinal direction. The first fastening sheet 12 a and the second fastening sheet 12 b are arranged with a space in the width direction of the base sheet 11. Specifically, it is preferable that the region between the first fastening sheet 12 a and the second fastening sheet 12 b corresponds to the center in the width direction of the base sheet 11. In this way, the fastening sheets 12a and 12b are joined to both sides of the base sheet 11 across the center in the width direction. A long belt-like outer layer sheet 13 can also be bonded to the other surface side of the base sheet 11. In this way, the laminate 10 is obtained by bonding at least the fastening sheet 12 to the base sheet 11.

[4-2. Reinforcement process]
As shown in FIG. 8, after attaching the two fastening sheets 12 a and 12 b to the base sheet 11, the reinforcing portion 40 is formed over the entire width direction of the laminate 10. As described above, the reinforcing portion 40 is a portion where the laminated body 10 is pressed by the reinforcing device 230, a portion where the laminated body 10 is heated and melted, or a portion where the melting and pressing are performed. As shown in FIG. 8, the reinforcing portion 40 is formed linearly across the entire width direction of the laminate 10 so as to straddle the first fastening sheet 12 a and the second fastening sheet 12 b. It is preferable.

[4-3. Division process]
As shown in FIG. 8, after the reinforcing portion 40 is formed in the laminated body 10, a central cutting line 20 extending along the longitudinal direction of the laminated body 10 is formed at the center in the width direction of the laminated body 10. At this time, the central cutting line 20 is formed in a region between the first fastening sheet 12a and the second fastening sheet 12b. Thereby, the laminated body 10 is divided into two on the left and right sides in the width direction by the central cutting line 20, and the portion where the first fastening sheet 12a is joined and the second fastening sheet 12b are joined. Divided into parts.

[4-4. Separation process]
As shown in FIG. 8, the laminate 10 divided into two by the central cutting line 20 is formed with a separation line 30 extending along the width direction, and is separated into individual fastening tapes 100. The separation line 30 is formed so as to extend over the entire width direction of the stacked body 10 and is orthogonal to the central cutting line 20. Further, the separation line 30 is formed so as to straddle the first fastening sheet 12a and the second fastening sheet 12b. At this time, the separation line 30 is formed so as to overlap with the reinforcing portion 40 provided in advance of the stacked body 10. That is, since the reinforcing portion 40 has a straight line shape parallel to the width direction, the separation line 30 is also formed in a straight line shape parallel to the width direction so as to overlap the reinforcing portion 40. The entire separation line 30 is accommodated within the range of the reinforcing portion 40.

  In this way, the substantially rectangular fastening tape 100 can be continuously manufactured. The substantially rectangular fastening tape 100 is mainly used by being attached to a disposable diaper such as a child. For other configurations and processes, the fourth embodiment is the same as the first embodiment.

  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 method of manufacturing a fastening tape used for a tape-type disposable diaper. For this reason, this invention can be utilized suitably in the manufacturing industry of a disposable diaper.

DESCRIPTION OF SYMBOLS 10 ... Laminated body 10C ... Center area | region 10L ... Left side area | region 10R ... Right side area | region 11 ... Base material sheet 12 ... Fastening sheet | seat 13 ... Outer layer sheet 20 ... Center cutting line 30 ... Disconnection line 40 ... Reinforcement part 100 ... Fastening tape 110 ... Main body Part 120 ... Tip part 200 ... Manufacturing apparatus 211 ... First unwinding roll 212 ... Second unwinding roll 213 ... Third unwinding roll 220 ... Pinch roll 230 ... Reinforcing device 231 ... Reinforcing joining roll 232 ... Plain roll DESCRIPTION OF SYMBOLS 240 ... Cutting device 241 ... Ultrasonic vibration device 242 ... Cutter roll 250 ... Cutting device 251 ... Conveyor 252 ... Cutter 252a ... Cutting blade 252b ... Flat surface 260 ... Shooting control device 300 ... Tape type disposable diaper 310 ... Landing tape

Claims (6)

A joining step of joining one or a plurality of belt-like fastening sheets (12) along the longitudinal direction to one surface of the belt-like substrate sheet (11) to obtain a laminate (10) of sheet members;
A dividing step of forming a central cutting line (20) extending in the longitudinal direction so as to divide the laminate (10) into left and right in the width direction;
Forming a separating line (30) extending in the width direction so as to be connected to the central cutting line (20) to obtain an individual fastening tape (100), and a method for producing a fastening tape. ,
Before the cutting step, further includes a reinforcing step of forming a reinforcing portion (40) in which the laminate (10) is pressed or melted at a site where the cutting line (30) is to be formed,
The method of manufacturing a fastening tape, wherein the separating step is a step of forming the separating line (30) within the range of the reinforcing portion (40) . The method of manufacturing a fastening tape according to claim 1, wherein the reinforcing step is performed before the dividing step. In the joining step, the fastening sheet (12) is joined to one surface of the base sheet (11) along the longitudinal direction, and the long side is joined to the other surface of the base sheet (11). The method for manufacturing a fastening tape according to claim 1 or 2, wherein the outer layer sheet (13) is joined along a direction to obtain a laminate (10) of sheet members. A step of producing a fastening tape according to the production method according to any one of claims 1 to 3 ,
Attaching the fastening tape to the front or back of the disposable diaper so as to extend from the left and right edges of the disposable diaper. Fastening tape attached to the front or back of a tape-type disposable diaper so as to extend from the left and right side edges of the disposable diaper,
A main body (110) fixed to the disposable diaper;
A tip (120) extending from the body (110);
A fastening sheet (12) provided at the tip (120);
Left and right side edges over the entire, the fastening tape having reinforcing portions which sheet member is formed by being pressed or melt that constitutes the main body portion (110) and (40), the said body portion (110). A tape-type disposable diaper to which the fastening tape according to claim 5 is attached so as to extend from the left and right side edges of the front body or the back body.

Images