JP6052986B2 - Method for manufacturing absorbent article - Google Patents

Description

  The present invention relates to a method for producing various absorbent articles including disposable diapers and sanitary napkins.

  When manufacturing absorbent articles such as disposable diapers and sanitary napkins, a long strip-shaped raw fabric sheet is unwound from a roll and transported, and various processing is performed during transport to manufacture the desired article. Is common. For example, in order to join an original sheet and another member, operations such as thermocompression bonding using a hot roll or application of an adhesive such as a hot melt adhesive to the original sheet are often performed. . These articles include dust accumulated during the manufacturing process, resin debris adhering to the heat roll, lump that the adhesive has solidified, and foreign matter that originally adheres to the original sheet or is part of the original sheet. May be mixed. Articles containing such foreign substances are excluded as defective products in the manufacturing process. The removal of defective products is generally performed based on the detection of foreign matter using various optical sensors.

  As said optical sensor, what employ | adopted the combination of the light projector arrange | positioned at the side edge side of a sheet | seat and the light receiver arrange | positioned at the other side edge side is known (patent document 1). reference). When there is a foreign object on the sheet, the amount of light received by the light receiver changes because the light emitted from the projector is blocked by the foreign object. A foreign object is detected by detecting the change. In addition, a first projector is disposed on one side edge of the sheet, a first light receiver is disposed on the other side edge, and a second projector is disposed on the other side edge. In addition, it has also been proposed to arrange a second light receiver on one side edge (see Patent Document 2). By adopting such an arrangement and measuring the average value of the amount of light received by each of the two light receivers to detect foreign matter, the detection sensitivity does not change regardless of the position of the foreign matter in the width direction of the sheet. It is described in the same literature that a foreign object can be detected.

  The technology described in each of the above-described documents relates to a method for detecting foreign matter present on a sheet. However, it may be useful to detect an object present on the roll surface in a processing machine for absorbent articles. For example, in the step of bonding the exterior sheet forming the outer surface of the absorbent article and the absorbent body with an adhesive, the two sheets are clamped by a pair of nip rolls after the bonding to ensure the bonding. In this case, there may be a problem that a part or all of the absorbent body is wound around the nip roll as a foreign matter due to the displacement of the absorbent body or the bleeding of the adhesive.

  Regarding detection of defects on the peripheral surface of the roll, for example, a technique described in Patent Document 3 is known. In this document, parallel light is irradiated from a direction orthogonal to the axial direction of the roll, light reflected from the roll is projected onto a screen, and defects are detected based on the brightness of the image formed there. Yes.

JP-A-6-180295 Japanese Patent Laid-Open No. 7-190953 Japanese Patent Application Laid-Open No. 2006-234771

  However, in the method described in Patent Document 3, in order to perform detection over the entire width in the axial direction of the roll, it is necessary to move the light source and the screen along the axial direction, or it is necessary to prepare the light source and the screen over the entire width. Therefore, the apparatus becomes complicated and the control becomes complicated. Further, in this document, since the inspection apparatus inspects the roll to be inspected part by part while moving, it is impossible to immediately detect the foreign matter as a whole. As a result, the method described in this document is unsuitable for inspection while manufacturing products that are continuously conveyed at high speed.

  Therefore, the subject of this invention is providing the manufacturing method of the absorbent article which can eliminate the fault which the prior art mentioned above has.

In the present invention, while conveying a long belt-like sheet in the extending direction, the constituent materials of a plurality of short absorbent articles are sequentially joined to one surface of the sheet by an adhesive,
The sheet to which the constituent material is bonded is passed between a pair of nip rolls, the sheet and the constituent material are clamped by the nip roll, and then the sheet is cut across the width direction between the constituent materials adjacent to each other in the transport direction. A method of manufacturing an absorbent article having a step of:
Among the pair of nip rolls, in the constituent material side nip roll in contact with the constituent material, the laser is parallel to the axial direction of the constituent material side nip roll and from one side edge to the other side edge of the constituent material side nip roll. Incident light with light as a light source is irradiated so that the incident light passes through the vicinity of the peripheral surface of the absorber-side nip roll, and the light that passes through the peripheral surface is received by a light receiver,
The present invention provides a method for manufacturing an absorbent article that inspects whether or not foreign matter is present on the peripheral surface of the constituent material side nip roll based on the amount of received light.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the absorbent article which can detect the foreign material on the roll surface with the simple structure which only receives the irradiated laser beam is provided.

FIG. 1 is a perspective view showing a pressing step between a raw sheet and an absorbent body using a pair of nip rolls in the method for manufacturing an absorbent article of the present invention. FIG. 2 is an example of a time sequence chart in the method for producing an absorbent article of the present invention. FIG. 3 is another example of a time sequence chart in the method for producing an absorbent article of the present invention.

  Hereinafter, the present invention will be described based on preferred embodiments thereof. As an example of the absorbent article which is the target of the production method of the present invention, there is an article having an exterior sheet forming the outer surface of the absorbent article and an absorbent body disposed on the skin facing surface side of the exterior sheet. The exterior sheet may be composed of a single-layer sheet material or may be composed of a laminate of two or more sheet materials. When the exterior sheet is composed of a laminate of two or more layers of sheet material, one or a plurality of elastic members may be sandwiched and fixed between the sheet materials in an expanded state. The extending direction of the elastic member can be, for example, the width direction or the longitudinal direction of the absorbent article.

  As the absorbent body disposed on the skin facing surface side of the exterior sheet, for example, a piled body including hydrophilic fibers such as flap pulp and a superabsorbent polymer can be used. This pile may be covered with a core wrap sheet made of various liquid permeable sheets including tissue paper and hydrophilic nonwoven fabric. Further, the absorbent body is in a state of an absorbent main body in which a liquid-permeable top sheet is arranged on one side and a liquid-impermeable or liquid-permeable back sheet is arranged on the other side. Further, it may be arranged on the skin facing surface side of the exterior sheet. Hereinafter, for convenience, it is described as an absorbent body, but the absorbent body can be used without limitation. Even if the form of the absorber is any of the above-described cases, the absorber and the exterior sheet are bonded and fixed by an adhesive. The bonding and fixing of both may be a direct bonding depending on a specific form of the absorber, or an indirect bonding via another member (for example, a back sheet).

  When manufacturing an absorbent article that is a target of the manufacturing method of the present invention, a long strip-shaped original sheet that is an original sheet of the exterior sheet is prepared, and the original sheet is in the same direction as the extending direction. To transport. The raw fabric sheet may be produced in-line in the production line of the absorbent article. Alternatively, a raw sheet is separately produced on a line different from the absorbent article production line, and is stored as a roll wound in a roll form. From the raw roll when the absorbent article is produced, You may supply the drawn-out original fabric sheet to the manufacturing line of an absorbent article. The raw sheet is not limited to the above-described exterior sheet, and may be a long belt-like sheet on which an absorber is disposed, such as a liquid-impermeable or liquid-impermeable back sheet or a liquid-permeable surface sheet. The sheet is not limited to the sheet forming the outer surface of the absorbent article.

  On the other hand, it is preferable to use what was manufactured in-line in the manufacturing line of an absorbent article as an absorber which is a constituent material of a short absorbent article. In this case, the absorbent bodies manufactured individually may be sequentially joined to the continuously conveyed raw sheet, and the absorbent body may be placed on the skin facing surface side of the original sheet, or may extend in one direction. A long absorbent body continuum may be manufactured, and the continuous body may be cut at a predetermined interval to form individual absorbent bodies, and then the absorbent bodies may be sequentially joined to the original fabric sheet.

  When each absorber is placed on the skin-facing surface side of the original fabric sheet, it is preferable to separate the adjacent absorbers in the conveying direction of the original fabric sheet by a predetermined distance.

  In order to join a short absorber to one side of a long strip-shaped exterior sheet with an adhesive, the absorber is scheduled to be placed on the skin facing surface of the original fabric sheet before joining each absorber to the original fabric sheet. An adhesive can be applied to the location. Instead of this application or in addition to this application, an adhesive can be applied to the surface of each absorber facing the original fabric sheet. There is no restriction | limiting in particular in the application pattern of an adhesive agent, The various application patterns known until now in the said technical field are employable. For example, using a coater-type coating device that coats adhesive from a nozzle that is in contact with the original fabric sheet, the adhesive can be applied to the entire area where the absorber is to be placed on the skin facing surface of the original fabric sheet without any gaps. it can. Alternatively, the adhesive can be applied in a spiral pattern or an ohm-shaped pattern by using an application device that applies an adhesive from an air rotary nozzle installed at a position separated from the original fabric sheet. Further, the adhesive can be applied in a striped or beaded pattern. The application amount of the adhesive is appropriately selected according to the type of the raw fabric sheet and the absorbent body.

  There are no particular restrictions on the adhesive application area. For example, an adhesive can be applied to the entire area of the opposing surface between the raw sheet and the absorber. Or an adhesive agent can be apply | coated only to the one part area | region in the opposing surface of an original fabric sheet | seat and an absorber. For example, it is possible to apply the adhesive only to the left and right side edge regions extending in the conveying direction of the original fabric sheet in the absorbent body. Or an adhesive agent can be apply | coated only to the both-ends edge area | region before and behind extending in the direction orthogonal to the conveyance direction of an original fabric sheet | seat among absorbers. Furthermore, it is possible to apply the adhesive in an annular shape only to the peripheral area of the absorber.

  FIG. 1 shows a state in which the original fabric sheet 1 and the absorbent body 2 are joined by the operation as described above, and the absorbent body 2 is joined to the skin facing surface 1a side of the original fabric sheet 1. The joined body 3 obtained in this way is introduced into a pinching device 6 composed of a pair of nip rolls 4 and 5 so that the original fabric sheet 1 and the absorbent body 2 are securely joined.

  The pair of nip rolls 4, 5 in the clamping device 6 includes a nip roll 4 that contacts the absorber (hereinafter also referred to as “absorber-side roll 4”) and a nip roll 5 that contacts the original sheet 1. In addition, as above-mentioned, when using an absorptive main body instead of an absorber, the absorber side roll 4 has the meaning of the absorptive main body side roll 4. FIG. Each of the rolls 4 and 5 is installed in the middle of the transport path of the original fabric sheet 1 so that the axial direction thereof is orthogonal to the transport direction A of the original fabric sheet 1. The rolls 4 and 5 are installed so that their axial directions are parallel to each other. Each roll 4, 5 has an axis supported by a support structure (not shown) and is rotatable in the transport direction A. In this manufacturing method, it is detected whether a foreign substance exists in the surrounding surface of the absorber side roll 4 among two rolls. With respect to the nip roll 5 on the side in contact with the original fabric sheet 1, the presence or absence of foreign matter on the peripheral surface may or may not be detected. The foreign matter may be colored and opaque, or colorless or colored, transparent or translucent. Specific examples of the foreign material include those in which the absorbent body and a part thereof are unintentionally peeled off and adhered to the roll due to the adhesive used when the absorbent body is bonded to the raw sheet 1.

  An optical device 22 in which a projector and a light receiver are integrated is installed on the first side edge 41 side of the absorber-side roll 4. The projector of the optical device 22 irradiates incident light using laser light as a light source parallel to the axial direction of the rolls 4 and 5 and from the first side edge 41 to the second side edge 42 of the absorber-side roll 4. It is configured to be possible. Specifically, the light projector of the optical device 22 can irradiate the circumferential surface of the absorber-side roll 4 and the space near the circumferential surface with incident light parallel to the axial direction of the absorber-side roll 4. The 1st side edge 41 of the absorber side roll 4 is the 1st side edge 11 side of the raw fabric sheet 1, the 2nd side edge 42 of the absorber side roll 4, and the 2nd side edge 12 side of the raw fabric sheet 1. . On the other hand, the light receiver of the optical device 22 is configured to be able to measure the amount of reflected light received later. In addition, as the optical device 22 in which the projector and the light receiver are integrated, a sensor generally called a retroreflective type, for example, a commercially available product such as Keyence LV-S61 or OMRON E3C-LR11 can be used.

  In general, in an absorbent article manufacturing apparatus, a manufacturing line extends in one direction, and one side is referred to as an operation side and the other side is referred to as an apparatus side across the manufacturing line. An operator of the production line can be arranged on the operation side, so that the production line can be easily operated and maintained. On the equipment side, a wall portion for fixing each device of the production line and a drive source for driving each device are installed, and an operator cannot be arranged during normal operation. In such a manufacturing apparatus, it is preferable to arrange the optical device 22 on the operation side because the adjustment and maintenance of the optical device 22 can be easily performed.

  As the projector of the optical device 22, various laser light sources can be used. Laser light is a suitable light source because it has the property of easily narrowing the luminous flux, and thus increases the sensitivity of detecting minute foreign matter. In the present embodiment, laser light having a wavelength in the visible light region, for example, red laser light can be used. On the other hand, as the light receiver of the optical device 22, for example, a charge coupled device or the like can be used. As the light source of the red laser light, it is preferable to use a laser diode that oscillates a red visible laser in the range of 635 nm to 690 nm, for example.

  The optical device 22 is installed at a position on the outer side in the width direction of the absorber-side roll 4 on the first side edge 41 side of the absorber-side roll 4. The optical device 22 is attached to a support structure including a support column 24 fixed in the vertical direction. This support structure is a structure different from the support structure (not shown) of the rolls 4 and 5. Therefore, the installation position of the optical device 22 can be adjusted vertically and horizontally independently of the installation positions of the rolls 4 and 5.

  The reflecting mirror 26 is installed on the second side edge 42 side of the absorber-side roll 4. The reflecting mirror 26 is installed so that the reflected light passes through the same optical path as the incident light irradiated from the projector of the optical device 22.

  The reflecting mirror 26 is installed at the outer side in the width direction of the absorber-side roll 4 on the second side edge 42 side of the absorber-side roll 4. In addition, the reflecting mirror 26 is attached to a support structure including a support column 28 fixed in the vertical direction. This support structure is a structure different from the support structure (not shown) of the absorber-side roll 4. Therefore, the installation position of the reflecting mirror 26 can be adjusted vertically and horizontally independently from the installation position of the absorber-side roll 4. Incident light from the projector of the optical device 22 is reflected by the reflecting mirror 26 and is received by the light receiver of the optical device 22 as reflected light.

  In the absorber-side roll 4, an injection unit 34 including a jet nozzle is disposed on the first side edge 41 side of the absorber-side roll 4. Similarly, the injection part 34 which consists of a jet nozzle is arrange | positioned also at the 2nd side edge 42 of the absorber side roll 4. FIG. Each injection part 34 is installed downstream of the optical device 22 and the reflecting mirror 26 in the rotation direction when viewed along the rotation direction of the absorber-side roll 4. Each injection unit 34 is attached to a support structure including a column 36 fixed in the vertical direction. This support structure is a structure different from the support structure (not shown) of the rolls 4 and 5 and the support structure of the optical device 22 and the reflecting mirror 26. Therefore, the installation position of the injection unit 34 can be adjusted vertically and horizontally independently of the installation positions of the rolls 4 and 5 and the optical device 22 and the reflecting mirror 26. When the air jetted from the jet part 34 arranged on one side edge side of the absorber-side roll 4 is strong enough to reach the other side edge side of the roll 4, jetted from each jet part 34 In order to prevent the air from interfering with each other, it is preferable that the positions of the ejection portions 34 are shifted.

  From each injection part 34, air is blown toward the axial direction center of the absorber-side roll 4. The injection unit 34 is displaced after the raw sheet 1 and the absorbent body 2 are joined and before the absorbent body 2 is clamped by the nip rolls 4 and 5, and the exposed adhesive is caused by the displacement. Absorption due to the adhesive when adhering to the absorber-side roll 4 or when the adhesive that has oozed out by being sandwiched between the raw sheet 1 and the absorber 2 adheres to the absorber-side roll 4 The absorbent body 2 is installed for the purpose of blowing away by wind pressure the part or all of the absorbent body 2 that has unintentionally adhered to the body-side roll 4, that is, the foreign matter to be removed in the present invention. When the foreign matter adhering to the peripheral surface of the roll 4 is removed by wind pressure by making the jet direction of air from each jet part 34 face each other toward the axial center of the absorber-side roll 4, The foreign matter is difficult to adhere to the original fabric sheet 1 and the absorbent body 2.

  The absorbent article method using the apparatus having the above configuration will be described. When the joined body 3 of the raw fabric sheet 1 and the plurality of absorbent bodies 2 passes through the nip rolls 4 and 5, the raw fabric sheet 1 and the absorbent body 2. Is pinched. Light is irradiated from the optical device 22 toward the reflecting mirror 26 on the peripheral surface of the absorber-side roll 4 to be sandwiched and the space in the vicinity thereof. The irradiated light is reflected by the reflecting mirror 26 and returns toward the optical device 22. Then, the amount of the returned light is measured by the optical device 22. When no foreign matter due to an adhesive or the like is attached to the peripheral surface of the absorber-side roll 4, the amount of reflected light received does not change. On the other hand, when the foreign substance resulting from an adhesive etc. has adhered to the surrounding surface of the absorber side roll 4, incident light is interrupted by the foreign substance and the light quantity of the incident light which reaches the reflective mirror 26 decreases. Moreover, even when the reflected light reflected by the reflecting mirror 26 returns to the light receiving unit of the optical device 22, the reflected light is blocked by the foreign matter, and the amount of reflected light reaching the light receiving unit is reduced. As a result, when there is a foreign substance on the absorber-side roll 4, the amount of light received by the light receiving unit of the optical device 22 is lower than when there is no foreign substance on the absorber-side roll 4. When the decrease in the amount of light exceeds the threshold value, a determination unit (not shown) that is electrically connected to the optical device 22 determines that there is a foreign object on the peripheral surface of the absorber-side roll 4, and FIG. The trigger signal S1 shown in FIG. Simultaneously with the generation of the trigger signal S1, the foreign object detection signal S2 is generated. In the foreign object detection signal S2, a delay time T1 until the foreign object detection signal S2 is turned off is set. Therefore, the foreign object detection signal S2 is kept on until the count for the delay time T1 is completed. The count of the delay time T1 is set to a time longer than the time required for the absorber-side roll 4 to make one rotation. The upper limit value of the delay time T1 is preferably set to a time required for the absorber-side roll 4 to make three rotations, for example, according to the production speed. Therefore, after the foreign matter is detected, the roll 4 makes one rotation and the foreign matter is removed during the rotation of the roll 4 until the foreign matter detection position reaches the light irradiation position again. During the counting of the time T1, the foreign object detection signal S2 is kept on. FIG. 2 shows a state in which the foreign matter is immediately removed and the trigger signal disappears after one rotation.

  When the foreign object detection signal S2 is turned on, the air injection signal S3 is also turned on in synchronization therewith. When the air ejection signal S3 is turned on, air is ejected from the ejection unit 34. Air is blown along the axial direction of the absorber-side roll 4 and toward the peripheral surface of the absorber-side roll 4. If the foreign matter is removed by blowing air from the time when the foreign matter is detected until the roll 4 makes one rotation, the trigger signal S1 is detected when the foreign matter detection position reaches the light irradiation position again after one revolution. Does not occur. Therefore, as shown in FIG. 2, the foreign object detection signal S2 is turned off after the count of the delay time T1 is completed to the set value. Further, in synchronization with the foreign object detection signal S2, the air injection signal S3 is also turned off, and air blowing is stopped. During this time, a period during which the foreign object detection signal S2 is on is stored in a determination unit (not shown). And the determination part is a timing based on the period during which the foreign object detection signal S2 is in the ON state, and a distinction part (not shown) arranged downstream of the nip rolls 4 and 5 and the light irradiation position. At a timing based on the distance between them, a discharge command for defective products is sent to the distinct part. The distinctive portion is disposed on the downstream side of the joined body 3 at a position between the absorbent bodies 2 adjacent to each other at a position before the original sheet 1 is cut. In the distinction unit that has received the discharge command from the determination unit, when the portion including the absorber 2 that has passed between the nip rolls 4 and 5 while air is blown to the absorber-side roll 4 reaches the distinction unit, The operation of discharging the part out of the conveyance path is performed. In the meantime, the conveyance of the original fabric sheet 1 is continued and the production line is not stopped. The term “defective product” as used herein refers to, for example, covering the absorber 2 due to foreign matter adhering to the absorber-side roll 4 (that is, part or all of the absorber 2 adhering unintentionally to the absorber-side roll 4). Products such as tissue paper or hydrophilic non-woven fabrics that are torn (not shown), and the absorbent body 2 is strongly pressed locally to cause local curing Products included. In addition, when the defective product is set as a portion that has passed between the nip rolls 4 and 5 while air is being blown onto the absorber-side roll 4, whether or not foreign matter is actually attached to the absorber-side roll 4 is Regardless, the product including the part is discharged as a defective product.

  After it is determined that foreign matter is present on the peripheral surface of the absorber-side roll 4, a trigger signal S1 is generated, and at the same time, the foreign matter detection signal S2 and the air injection signal S3 are turned on. When the foreign matter is not removed before the rotation of 4 once, as shown in FIG. 3, when the foreign matter reaches the light irradiation position again after one rotation, the trigger signal S1 is generated again. By generating the trigger signal S1 again, the delay time T1 count returns to the initial value, and the count from the beginning is started. Accordingly, the foreign matter detection signal S2 and the air injection signal S3 are continuously maintained in the on state, and the air injection from the injection unit 34 is continuously performed.

  The state in which the trigger signal S1 is generated every time the absorber-side roll 4 makes one rotation is a state in which the foreign matter detection signal S2 and the air injection signal S3 are on for a long time, and air is blown from the injection unit 34. However, it means that the foreign matter adhering to the peripheral surface of the roll 4 is not removed. In the meantime, the absorber 2 that has passed between the nip rolls 4 and 5 may have some defects (for example, the above-described tearing of the core wrap sheet or local hardening of the absorber). 2 needs to be discharged in the above-described distinction section. Therefore, if the ON state of the foreign matter detection signal S2 and the air injection signal S3 is maintained for a long time, a large amount of discharged products is generated, which is not economical. In addition, this may cause trouble in the manufacturing apparatus. Therefore, as shown in FIG. 3, even if the foreign object detection signal S2 and the air injection signal S3 are turned on and the air blowing is started and the predetermined time T2 has elapsed, the foreign object detection signal S2 is kept on. When the judgment that foreign matter is present on the peripheral surface of the roll 4 is maintained, the alarm / line stop signal S4 is turned on, a warning is given to the production line, and the presence of foreign matter to the operator And the conveyance of the original fabric sheet 1 is stopped. The air injection signal S3 is turned off when the alarm / line stop signal S4 is turned on. Thereby, the blowing of air from the injection unit 34 is stopped. On the other hand, the foreign object detection signal S2 is kept on. Then, after confirming that the production line has stopped, the foreign matter is removed from the roll 4.

  When the foreign matter removal operation from the roll 4 is completed, the alarm / line stop signal S4 is returned to the OFF state (not shown). When the alarm / line stop signal S4 is turned off, the foreign object detection signal S2 changes from the on state to the off state. Then, the operation of the apparatus is resumed.

  As described above, according to this manufacturing method, the arrangement of the optical device 22 and the optical axis adjustment of the light irradiated from the projector of the optical device 22 and the light reflected by the reflecting mirror 26 are easy, and man-hours are saved. There is an advantage that can be. In addition, the entire width of the absorber-side roll 4 can be inspected by using only one optical device 22, and foreign matter can be detected immediately. Furthermore, if it is a small foreign material or a foreign material adhering with a weak force, it can be removed by blowing air from the injection unit 34. At this time, since it is not necessary to stop the production line, the influence on production can be minimized. On the other hand, if there is foreign matter that cannot be removed by blowing air, the production line is stopped and removed to effectively prevent the outflow of products that may have defects. be able to. In addition, the presence of the foreign matter can be detected without being affected by the color of the absorber-side roll 4 and the color of the foreign matter.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, foreign matter can be detected while air is blown onto the optical device 22 and the reflecting mirror 26 used in the above embodiment. By performing such spraying, it is possible to prevent dust generated due to conveyance of the original fabric sheet 1 or the like, scattered adhesive solidified material, or the like from adhering to the optical device 22 or the reflecting mirror 26. Moreover, the deposit | attachment adhering to the optical apparatus 22 or the reflective mirror 26 can be removed.

In the above-described embodiment, the optical device 22 in which the projector and the light receiver are integrated is used. However, instead of this, a separate projector and light receiver may be used.
In the above embodiment, if the determination that foreign matter is present is maintained even after a predetermined time T2 has elapsed since the start of air blowing, the conveyance of the original fabric sheet 1 is stopped. However, regardless of the air injection signal S3, if the foreign matter detection signal S2 is kept on after the lapse of the predetermined time T2 from the foreign matter detection signal S2, the conveyance of the original sheet 1 is stopped. Good.

  Moreover, in the said embodiment, although the one original fabric sheet 1 was used, it replaces with this and uses the two long strip | belt-shaped sheet | seat conveyed in parallel and spaced apart, and both long strip | belt-shaped sheet | seats You may arrange | position the absorber 2 intermittently so that it may straddle between.

  Moreover, in the said embodiment, although the exterior sheet | seat was used as a elongate strip | belt-shaped sheet | seat, it replaces with this and uses another sheet | seat which comprises an absorbent article, for example, a surface sheet, One surface of the elongate strip | belt-shaped sheet | seat of this surface sheet | seat An absorber may be arranged.

  Moreover, in the said embodiment, although the absorber 2 was introduce | transduced between the nip rolls 4 and 5 in the state arrange | positioned on the one surface of the raw fabric sheet 1, the absorber side nip roll 4 is individual for a long absorber precursor. When the anvil is used between the nip rolls 4 and 5 when the anvil roll of the slip cutter used for cutting the absorbent body is used or when the transfer roll abutting against the anvil roll is also used. The absorber is disposed on one surface of the original fabric sheet 1.

  Moreover, although the said embodiment is an example which applied this invention to the process of joining the absorber 2 to one surface of the original fabric sheet 1, if it is a constituent material of a short absorbent article, constituent materials other than the absorber 2 will be described. You may apply this invention to the process of joining. Short constituent materials include, for example, a film made of an elastic material used to impart stretchability to an absorbent article, a composite elastic sheet containing the elastic material, a fastening tape, a target tape to which the fastening tape is fixed, and the like Is mentioned. “Short length” is a term used in contrast to the length of the original fabric sheet 1 that is substantially infinite, and means that the length along the conveying direction is finite.

This invention discloses the manufacturing method of the following absorbent articles further regarding embodiment mentioned above.
<1>
While conveying the long belt-like sheet in its extending direction, the constituent materials of a plurality of short absorbent articles are sequentially joined to one surface of the sheet by an adhesive,
The sheet to which the constituent material is bonded is passed between a pair of nip rolls, the sheet and the constituent material are clamped by the nip roll, and then the sheet is cut across the width direction between the constituent materials adjacent to each other in the transport direction. A method of manufacturing an absorbent article having a step of:
Among the pair of nip rolls, in the constituent material side nip roll in contact with the constituent material, the laser is parallel to the axial direction of the constituent material side nip roll and from one side edge to the other side edge of the constituent material side nip roll. Incident light with light as a light source is irradiated so that the incident light passes through the vicinity of the peripheral surface of the absorber-side nip roll, and the light that passes through the peripheral surface is received by a light receiver,
A method for manufacturing an absorbent article, in which whether or not there is a foreign substance on the peripheral surface of the constituent material side nip roll based on the amount of received light is determined.

<2>
The method for producing an absorbent article according to <1>, wherein the constituent material is an absorbent body or an absorbent main body.
<3>
Prior to joining the constituent material to the sheet, an adhesive is applied to a position where the constituent material is to be placed on the skin-facing surface of the sheet, or an adhesive is applied to the surface of the constituent material facing the sheet. The manufacturing method of the absorbent article as described in said <1> or <2> which apply | coats.
<4>
The foreign matter is a material that is unintentionally peeled off and adhered to the constituent material side nip roll due to an adhesive used when joining the constituent material to the sheet, The method for producing an absorbent article according to any one of <1> to <3>.
<5>
Reflecting the incident light by a reflector installed on the other side edge so that the reflected light passes through the same optical path as the incident light,
<1> to <4>, wherein the reflected light that has returned is received by the light receiver installed on the side edge, and the amount of the reflected light is measured. Manufacturing method of absorbent article.
<6>
The manufacturing method according to <5>, wherein a retroreflective sensor in which the light source and the light receiver are integrated is used.
<7>
The manufacturing method according to <5> or <6>, wherein the optical device including the light source and the light receiver is attached to a structure different from a support structure of the pair of nip rolls.
<8>
The method of manufacturing an absorbent article according to any one of <5> to <7>, wherein the reflecting mirror is attached to a structure different from the pair of support structures of the nip rolls.
<9>
The method for producing an absorbent article according to any one of <5> to <9>, wherein one optical device in which the light source and the light receiver used are integrated.

<10>
The manufacturing method according to any one of <1> to <9>, wherein a blowing unit that blows air toward a peripheral surface of the constituent material side nip roll is used.
<11>
<10> The jet nozzle as the spraying means is disposed on at least one side edge of the absorber-side nip roll, and air is blown from the jet nozzle toward the axial center of the absorber-side nip roll. The manufacturing method as described in.
<12>
While it is determined that foreign matter is present on the circumferential surface of the absorber-side nip roll, air is blown by the blowing means along the axial direction of the absorber-side nip roll and toward the circumferential surface of the absorber-side nip roll, <10> or <11> The production method according to <11>.
<13>
As a result of the air blowing, when no foreign matter is detected on the peripheral surface of the absorber-side nip roll, the air blowing is stopped, and the portion including the absorber that has passed between the nip rolls while the air is being blown, The manufacturing method according to any one of <10> to <12>, wherein the sheet is discharged out of the conveyance path as a defective product in the step after cutting the sheet.
<14>
Any one of the above items <1> to <13>, in which the conveyance is stopped when it is determined that foreign matter is present on the peripheral surface of the absorber-side nip roll even after the predetermined time has elapsed. The manufacturing method as described in.
<15>
The manufacturing method according to <14>, wherein the predetermined time is an elapsed time after the foreign object detection signal and the air injection signal are turned on and the air blowing is started.

<16>
<1> thru | or <15 which arrange | positions the said constituent material intermittently so that it may straddle between both long strip | belt-shaped sheet | seats using the said long strip | belt-shaped sheet | seat conveyed in parallel and spaced apart from each other. The manufacturing method of any one of>.
<17>
When the constituent material side nip roll also serves as an anvil roll of a slip cutter used for cutting long constituent material precursors into individual constituent material sides, or a transfer roll that contacts the anvil roll The manufacturing method according to any one of <1> to <16>, wherein the constituent material is disposed on one surface of the sheet when the constituent material is introduced between the pair of nip rolls.
<18>
The manufacturing method according to any one of <1> to <17>, wherein the long belt-like sheet is an exterior sheet that forms an outer surface of an absorbent article.
<19>
The short constituent material is a film made of an elastic material used to give stretchability to an absorbent article, a composite elastic sheet containing the elastic material, a fastening tape, a target tape to which the fastening tape is fixed, and the like. The manufacturing method according to any one of the above items <1> to <18>.

DESCRIPTION OF SYMBOLS 1 Original fabric sheet 2 Absorber 3 Joined body 4 Absorber side nip roll 5 Sheet side nip roll 6 Clamping device 22 Optical device 26 Reflecting mirror 34 Injection part 41 1st side edge 42 2nd side edge

Claims (7)

While conveying the long belt-like sheet in its extending direction, the constituent materials of a plurality of short absorbent articles are sequentially joined to one surface of the sheet by an adhesive,
The sheet to which the constituent material is bonded is passed between a pair of nip rolls, the sheet and the constituent material are clamped by the nip roll, and then the sheet is cut across the width direction between the constituent materials adjacent to each other in the transport direction. A method of manufacturing an absorbent article having a step of:
Among the pair of nip rolls, in the constituent material side nip roll in contact with the constituent material, the laser is parallel to the axial direction of the constituent material side nip roll and from one side edge to the other side edge of the constituent material side nip roll. Incident light with light as a light source is irradiated so that the incident light passes through the vicinity of the peripheral surface of the absorber-side nip roll, and the light that passes through the peripheral surface is received by a light receiver,
A step of inspecting whether or not there is foreign matter on the peripheral surface of the constituent material side nip roll based on the amount of the received light ,
A jet nozzle as a blowing means for blowing air toward the peripheral surface of the absorber-side nip roll is disposed on at least one side edge side of the absorber-side nip roll, and toward the axial center of the absorber-side nip roll. The manufacturing method of an absorbent article which blows air from this jet nozzle .   The manufacturing method of the absorbent article of Claim 1 whose said structural material is an absorber or an absorptive main body. Reflecting the incident light by a reflector installed on the other side edge so that the reflected light passes through the same optical path as the incident light,
The method for producing an absorbent article according to claim 1 or 2, wherein the reflected light that has returned is received by a light receiver installed on the side edge and the amount of the reflected light is measured.   The manufacturing method according to claim 3, wherein a retroreflective sensor in which the light source and the light receiver are integrated is used. Air is blown by the blowing means along the axial direction of the absorber-side nip roll and toward the circumferential surface of the absorber-side nip roll while it is determined that foreign matter exists on the peripheral surface of the absorber-side nip roll. Item 5. The production method according to any one of Items 1 to 4 . As a result of the air blowing, when no foreign matter is detected on the peripheral surface of the absorber-side nip roll, the air blowing is stopped, and the portion including the absorber that has passed between the nip rolls while the air is being blown, The manufacturing method according to claim 1, wherein the sheet is discharged out of the conveyance path as a defective product in the step after cutting the sheet. The conveyance is stopped according to any one of claims 1 to 6 , wherein the conveyance is stopped when it is determined that foreign matter is present on the peripheral surface of the absorber-side nip roll even after a predetermined time has elapsed. Manufacturing method.

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