WO2018042574A1 - 吸収体及び吸収性物品の製造方法 - Google Patents
吸収体及び吸収性物品の製造方法 Download PDFInfo
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- WO2018042574A1 WO2018042574A1 PCT/JP2016/075559 JP2016075559W WO2018042574A1 WO 2018042574 A1 WO2018042574 A1 WO 2018042574A1 JP 2016075559 W JP2016075559 W JP 2016075559W WO 2018042574 A1 WO2018042574 A1 WO 2018042574A1
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- Prior art keywords
- absorber
- curved region
- absorbent body
- manufacturing
- absorbent
- Prior art date
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15707—Mechanical treatment, e.g. notching, twisting, compressing, shaping
- A61F13/15723—Partitioning batts; Cutting
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15699—Forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or without additional treatment of the webs
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15707—Mechanical treatment, e.g. notching, twisting, compressing, shaping
- A61F13/15731—Treating webs, e.g. for giving them a fibrelike appearance, e.g. by embossing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
- A61F13/47—Sanitary towels, incontinence pads or napkins
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
- A61F13/47—Sanitary towels, incontinence pads or napkins
- A61F13/472—Sanitary towels, incontinence pads or napkins specially adapted for female use
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
- A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
- A61F13/51104—Topsheet, i.e. the permeable cover or layer facing the skin the top sheet having a three-dimensional cross-section, e.g. corrugations, embossments, recesses or projections
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/539—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers
Definitions
- the present invention relates to an absorbent body and a method for producing an absorbent article.
- an absorber continuous body in which the absorber is connected in the transport direction is prepared and transported in the transport direction. And while the absorber continuous body is conveyed in a conveyance direction, it cut
- the absorbent pad manufacturing method for absorbent articles of Patent Document 1 can be cited.
- an absorber has the protrusion part which protrudes on the outer side of the width direction in the edge part of the width direction. And when manufacturing an absorber, the absorber continuous body which has a shape where the longitudinal direction of an absorber follows a conveyance direction and the absorber is connected with the conveyance direction is prepared.
- an absorbent body of an absorbent article there is one having an end extension portion extending outward from the end portion in the longitudinal direction at the end portion in the longitudinal direction.
- an arcuate shape surrounded by a circular arc (a central angle of 180 degrees or less) and a string can be cited.
- the arc portion of the arcuate shape extends outward.
- the extended portion is formed for reasons such as securing the amount of absorption and matching with the outer shape of the product, and generally has a shape symmetrical with respect to the longitudinal center line.
- the absorber is used for sanitary napkins and incontinence pads, for example.
- the absorber When the absorber is manufactured by the above-described manufacturing method, for example, the absorber having a shape in which the widthwise ends of the absorber are connected to each other so that the widthwise direction of the absorber is along the transport direction.
- a continuous body is prepared and transported in the transport direction.
- the end extending portion that extends outward from the end portion in the transverse direction of the absorber continuum is configured by alternately arranging arcuate portions along the transport direction.
- an absorber continuous body is cut
- the conveyance timing and the cutting timing of the absorber continuum are shifted, the cutting position in the conveyance direction may be shifted.
- the absolute displacement is smaller than in the opposite case. Even if the value is the same, the influence of the positional deviation becomes large. In other words, even if the absolute value of misregistration is a value within the tolerance range allowed for the manufacturing apparatus, the proportion of the absolute value of misregistration with respect to the dimension in the transport direction increases because the dimension in the transport direction is short. Therefore, it becomes easy for the consumer to recognize it as a defective product.
- An object of the present invention is to provide a method for manufacturing an absorbent body in which an absorbent body having a shorter dimension in the conveying direction than in a transverse direction is formed, and the cutting position is shifted when the absorbent body continuous body is cut along the transverse direction.
- an object of the present invention is to provide a method for manufacturing an absorbent body that makes it difficult for consumers to recognize the positional deviation.
- the manufacturing method of the absorber of the present invention is as follows.
- the convex curved region and the concave curved region are alternately arranged along the transport direction
- the cutting step includes a step of cutting the absorber continuous body in the concave curved region.
- the manufacturing method of the absorbent body has the above-described configuration, that is, the end extending portion in the transverse direction of the absorbent body continuous body is configured by alternately arranging convex curved regions and concave curved regions along the transport direction, and cutting.
- the step includes a step of cutting the absorber continuous body at any position in the conveyance direction in the concave curved region.
- the absorbent body formed by cutting has a dimension in the transport direction shorter than that in the transverse direction, the transverse direction and the transport direction are the longitudinal direction and the width direction of the absorbent body, respectively.
- the end in the longitudinal direction (transverse direction) of the absorbent body which is composed of the convex curved area and the concave curved areas located on both sides thereof, has a width like concave-convex-concave. It becomes the shape which arranged continuously along the direction (conveyance direction).
- the top of the convex curved region is conspicuous, so that it can be easily recognized as the center in the width direction of the absorbent body.
- a consumer who sees a continuous concave-convex-concave shape recognizes it as part of a continuous pattern and is unaware of the concept of center.
- the center of the width direction is at the end in the longitudinal direction of the absorber.
- the center of the absorbent body in the width direction can be prevented from impressing the consumer at the end in the longitudinal direction of the absorbent body due to the visual effect of the convex curved region and the concave curved region.
- the cutting position in the transport direction is shifted, and the top of the convex curved region is not positioned at the center in the transport direction (width direction) of the absorbent body, and is not line symmetric with respect to the longitudinal center line of the absorbent body. Therefore, it is possible to make it difficult for consumers to recognize the positional deviation. Thereby, it can be made difficult for a consumer to consider an absorber as defective, and it can avoid impairing the quality of an absorbent article.
- the manufacturing method of the absorber of the present invention is as follows.
- the contour line of the convex curved region is composed of a convex curve, or a convex curve and a straight line
- the contour line of the concave curved region is a concave shape. It is composed of a curved line or a concave curve and a straight line, and in each of the contour line of the convex curved region and the contour line of the concave curved region, the angle at which the tangent of an arbitrary point and the tangent of another arbitrary point intersect is
- the manufacturing method of the absorber according to (1) above which is not less than 150 degrees and not more than 210 degrees.
- the angle range is limited so that the intersecting angle between tangents at arbitrary points of the contour line in the convex curved region or the concave curved region becomes a relatively large obtuse angle. Therefore, the degree of convex curvature or concave curvature in the concave curved area or convex curved area can be made small and gentle. As a result, when the absorbent body is formed, the center of the absorbent body in the width direction (conveyance direction) can be made less impressive.
- the cutting position in the cutting process is shifted, and even if the top of the convex curved region is not located at the center in the width direction (conveying direction) of the absorber, the top of the convex curved region is the center of the absorber. Can be difficult to see, or can be inconspicuous around the top of the convex curved region. That is, even if the cutting position is shifted, the positional shift can be hardly recognized.
- the manufacturing method of the absorber of the present invention is as follows: (3) a circular arc having a center outside the transverse end edge of the absorber continuous body, the outline of the concave curved region, and the absorber At least one of an elliptical arc having a focal point outside the transverse edge of the continuum, wherein the contour of the convex curved region is inside the transverse edge of the absorber continuum At least one of a circular arc having a center at the center and an elliptical arc having a focal point on the inner side of the transverse edge of the absorber continuum according to (1) or (2)
- the manufacturing method of an absorber may be sufficient.
- the concave curved region and the convex curved region include an arc or an elliptical arc, whereby the degree of concave or convex curvature can be reduced and moderated in the concave curved region or the convex curved region. Therefore, the center of the absorbent body in the width direction (conveyance direction) can be impressed. Thereby, even if the position of cutting in the cutting step is shifted, the top of the convex curved region can hardly be seen as the center in the width direction (conveying direction) of the absorber, or the top can be made inconspicuous. That is, even if the cutting position is deviated, the misregistration can be hardly recognized.
- the radius of curvature of an arbitrary point of the contour line of the concave curved region in the absorbent body continuous body is larger than the radius of curvature of an arbitrary point of the contour line of the convex curved region.
- or (3) may also be large.
- the radius of curvature of an arbitrary point of the contour line of the concave curved region where cutting is performed in the cutting step is larger than the radius of curvature of an arbitrary point of the contour line of the convex curved region where cutting is not performed. large.
- the change in the contour line of the concave curved region is more gradual or gentle than the change in the contour line of the convex curved region.
- the radius of curvature at an arbitrary point is a dimension of the absorbent body in the transport direction.
- A is A or more and 3A or less.
- the degree of convex curvature or concave curvature in the concave curved region or convex curved region The degree can be made small and gradual.
- the center in the width direction (conveyance direction) of the absorber can be made less impressive.
- the radius of curvature is 3 A or less, the convex curve can be rounded to some extent at the top of the convex curve region.
- the size of the absorber can be maintained at a sufficient size. Accordingly, it is possible to achieve both the difficulty of recognizing misalignment and the high absorption performance.
- the ratio of the minimum dimension to the maximum dimension in the transverse direction of the absorbent continuous body is 0.8 to 0.95, (1) to (5)
- the manufacturing method of the absorber as described in any one of these may be sufficient.
- the ratio of the maximum dimension in the transverse direction (the top of the convex curved area) and the minimum dimension (the bottom of the concave curved area) is within a predetermined range close to 1, In the curved region, the degree of convex curvature and the degree of concave curvature can be made small and gentle.
- the center of the absorbent body in the width direction can be made less impressive.
- the cutting position in the cutting process is shifted, and even if the top of the convex curved region is not located at the center in the width direction (conveying direction) of the absorber, the top of the convex curved region is the center of the absorber. Can be difficult to see, or can be inconspicuous around the top of the convex curved region. That is, even if the cutting position is shifted, the positional shift can be hardly recognized.
- the manufacturing method of the absorber according to the present invention includes (7) a concave curved region with reference to an imaginary line passing through a junction between the contour line of the convex curved region and the contour line of the concave curved region and parallel to the transport direction. If the distance in the transverse direction between the most concave position and the virtual line is a concave dimension, and the distance in the transverse direction between the most convex position of the convex curved region and the virtual line is a convex dimension, the concave in the transverse direction is The manufacturing method of the absorbent body according to (6) above, wherein the dimension is smaller than the convex dimension.
- the concave dimension of the concave curved region in the transverse direction is smaller than the convex dimension of the convex curved region, the concave curvature of the concave curved region becomes inconspicuous, and in the vicinity of the center of the conveying direction in the concave curved region.
- the change in dimension in the transverse direction is reduced. Therefore, even if the cutting position is deviated forward or backward in the conveying direction, the change in the longitudinal dimension of the absorbent body in the concave curved region is small and inconspicuous, making it difficult for consumers to recognize the misalignment. be able to.
- the manufacturing method of the absorber of the present invention is (8) the above (6) or the outline of the transverse end extending portion of the absorber continuum having a shape of a sine wave or a composite wave of a plurality of sine waves.
- the manufacturing method of the absorber as described in (7) may be sufficient.
- the wave shape of the cut absorber is continuous with the consumer. Recalling that the center in the width direction (conveying direction) does not exist at the end in the longitudinal direction. Therefore, even if the cutting position is shifted, it is difficult to recognize the positional shift.
- the manufacturing method of the absorber of the present invention further includes (9) a processing step of performing a predetermined processing for each region to be the absorber in the absorber continuum between the preparation step and the cutting step.
- or (8) may be sufficient.
- a predetermined processing step (example: slit formation processing, pressing processing) may be performed on the absorber continuous body.
- the manufacturing method of this absorber can make it difficult to recognize misalignment including misalignment that occurs in the processing step by performing the processing step before the cutting step.
- an absorbent material continuous body in which the absorbent body material, which is the material of the absorbent body, extends in a band shape in the transport direction, The extending portion is cut out so as to have a shape of the concave curved region and the convex curved region, and further includes a forming step of forming the absorbent body continuous body, according to any one of the above (1) to (9).
- the manufacturing method of this absorber may be sufficient.
- the continuous absorbent body can be obtained relatively easily by cutting out the end portions in the transverse direction of the belt-shaped absorbent body material continuous body into the shape of the concave curved region and the convex curved region. As a result, the effect of making it difficult to recognize misalignment can be more easily exhibited.
- the preparation step corresponds to the concave curved region and the convex curved region in the transversely extending end portion of the absorbent material that is the material of the absorbent body.
- the manufacturing method of the absorbent article of the present invention includes (12) a step of obtaining the absorber by executing the manufacturing method of the absorber according to any one of (1) to (11) above, A laminating and combining step of laminating a top sheet and a back sheet; an outer edge of the transverse end extending portion in the absorbent body formed in the cutting step; and a transverse end extending portion of the top sheet and the back sheet.
- the manufacturing method of an absorptive article provided with the cutting-out process which cuts out the surface sheet and the back sheet into a product shape so that the distance to the outer edge of may not be constant.
- both ends are similar to each other
- the absorber is laminated with the top sheet at the time of manufacture, there is a possibility that the position shift of the end portion of the absorber is conspicuous. Therefore, in the method for manufacturing an absorbent article, the distance between the outer edges is not constant. Thereby, it is possible to make it harder to recognize the displacement of the absorber.
- the manufacturing method of the absorbent article of the present invention includes (13) the laminating step immediately after the cutting step, a surface sheet laminating step of laminating a surface sheet on the absorber, and immediately after the surface sheet laminating step.
- the positional deviation in the width direction of the embossed portion in the absorbent body is easily recognized by the consumer due to the relationship with the position of the side edge in the width direction of the absorbent body.
- the method for producing an absorbent article according to the present invention is (14) the method for producing an absorbent article according to (12) or (13) above, wherein only the surface sheet is present on the skin side of the absorbent body. Also good. Generally, when there is only a surface sheet on the skin side of the absorbent body in the absorbent article, the consumer can easily visually recognize the shape of the absorbent body through the surface sheet. In such a case, the consumer can easily recognize the displacement of the absorber. Therefore, in the manufacturing method of the present absorbent article, by applying this manufacturing method even in such a case, the effect of making it difficult to recognize misalignment can be exhibited more remarkably.
- the manufacturing method of the absorber which can make it difficult for consumers to recognize the positional deviation can be provided.
- FIG. 1 is a schematic overall view of an absorbent article manufacturing apparatus according to an embodiment. 1 is a schematic overall view of an absorbent article manufacturing apparatus according to an embodiment. It is a figure explaining the manufacturing method of the absorbent article which concerns on embodiment. It is a figure explaining the manufacturing method of the absorbent article which concerns on embodiment. It is a figure which shows the absorber continuous body which concerns on embodiment. It is a figure explaining the shape of an absorber continuous body. It is a figure explaining the shape of an absorber continuous body. It is a figure explaining the shape of an absorber continuous body. It is a figure explaining the shape of an absorber continuous body. It is a figure explaining the shape of an absorber continuous body. It is a figure explaining the shape of an absorber continuous body.
- the absorbent article and the absorbent body according to the present embodiment will be described with reference to the drawings, taking a sanitary napkin as an example.
- the type and use of the absorbent article are not particularly limited, and examples include panty liners and light incontinence pads.
- the liquid which the absorbent article is to be absorbed is not particularly limited, and examples thereof include liquid excrement and body fluid of the wearer.
- FIG.1 and FIG.2 is a figure which shows the absorbent article 2, The top view and the exploded perspective view in the state which expand
- the absorbent article 2 has a longitudinal direction L, a width direction W, and a thickness direction T perpendicular to each other, a main body 2a extending in the longitudinal direction L, and extending on both sides of the width direction W at a substantially central portion in the longitudinal direction L.
- a pair of flap portions 2b and 2b are provided.
- the absorbent article 2 has a central axis CL extending in the longitudinal direction L through the center in the width direction W, and a central axis CW extending in the width direction W through the center in the longitudinal direction L of the pair of flap portions 2b, 2b.
- the upper side is the front of the absorbent article 2 and the lower side is the rear of the absorbent article 2. Since the longitudinal direction L, the width direction W, and the thickness direction T of the absorbent article 2 coincide with the longitudinal direction, the width direction, and the thickness direction of each material of the absorbent article 2 described later, the absorbent article 2 and its The longitudinal direction L, the width direction W, and the thickness direction T are used in common for each material.
- the “plan view” means that the absorbent article 2 in a developed state is viewed in the thickness direction T from the upper surface side.
- “Skin side” and “non-skin side” refer to the side closer to the wearer's skin surface and the far side when the absorbent article 2 is worn by the wearer of the absorbent article 2.
- a direction toward the central axis CL and a direction away from the central axis CL are defined as directions inside and outside the width direction W, respectively.
- a direction toward the central axis CW and a direction away from the central axis CW are defined as the inner and outer directions of the longitudinal direction L, respectively. These definitions are also commonly used for each material of the absorbent article 2.
- the absorbent article 2 is a sanitary napkin and has extensibility in the longitudinal direction L.
- the extensibility in the longitudinal direction L is higher than the extensibility in the width direction W.
- extensibility refers to the property that when a tensile force is applied to a certain object, the shape of the object extends in that direction. In this case, when the tensile force disappears, the shape of the object may return to the original shape, or may approach the original shape but may not return to the original shape.
- the absorbent article 2 may have elasticity in the longitudinal direction L.
- Elasticity refers to the property that when a tensile force is applied to an object, the shape of the object stretches in that direction, and when the tensile force disappears, the shape of the object returns to its original shape, which can be said to be elastic.
- Extensibility and stretchability may be expressed as material properties, or may be expressed in combination with the shape of the material or other materials.
- the degree of elongation in extensibility and stretchability for example, the tensile elongation (breaking elongation) is at least 5% or more. In that case, the measuring method is measured by a tensile elongation test of the fiber sheet described later.
- the absorbent article 2 has a rounded rectangular shape, a vertically long oval shape, or an oval shape, and the outer edges 2T1 and 2T2 at both end edges in the longitudinal direction L of the main body 2a have a substantially semicircular or bowl shape.
- a region that is in contact with the excretion port that is, an excretion port contact region STA is set at the center in the longitudinal direction L and slightly in the center in the width direction W.
- a pressing part 26 is formed on and around the excretion opening contact area STA.
- surroundings, the front part pressing part 26c, and the rear pressing part 26d are formed.
- the flap portion 2b has a semicircular or semi-elliptical shape, and in the longitudinal direction L, the positions of both ends (roots) and the center of the pair of flap portions 2b, 2b are both ends of the excretory opening contact area STA. And it is formed so as to substantially overlap the position of the central portion.
- the absorbent article 2 includes a liquid-permeable top sheet 4, a liquid-impermeable back sheet 5, and an absorbent body 3 disposed between the top sheet 4 and the back sheet 5.
- the pressing part 26 is formed by pressing the top sheet 4 and the absorber 3.
- the surface sheet 4, the back surface sheet 5, and the absorber 3 are formed so that it can extend substantially integrally.
- the topsheet 4 has a front side portion 4a and a rear side portion 4b with the central axis CW as a boundary.
- the front side portion 4a is a portion having almost no extensibility in the longitudinal direction L and the width direction W.
- the rear side portion 4b is a portion in which the extensibility in the longitudinal direction L is higher than the extensibility in the width direction W.
- the extensibility in the longitudinal direction L is high and there is almost no extensibility in the width direction W. It is.
- the rear portion 4b may have stretchability or elasticity in addition to extensibility.
- As a method for imparting extensibility for example, gear stretching treatment can be mentioned. In that case, stretchability can also be imparted.
- the top sheet 4 also has stretchability in the rear side portion 4b.
- the back sheet 5 has a front portion 5a and a rear portion 5b with the central axis CW as a boundary.
- the front portion 5a is a portion having almost no extensibility in the longitudinal direction L and the width direction W.
- the rear portion 5b is a portion in which the extensibility in the longitudinal direction L is higher than the extensibility in the width direction W.
- the extensibility in the longitudinal direction L is high and there is almost no extensibility in the width direction W. It is.
- the rear portion 5b may have stretchability or elasticity in addition to extensibility.
- As a method for imparting extensibility for example, gear stretching treatment can be mentioned. In that case, stretchability can also be imparted.
- the back sheet 5 also has stretchability in the rear side portion 5b.
- the absorber 3 includes an absorber body 3m, and further includes a carrier sheet 3n bonded to the surface of the absorber body 3m on the back sheet 5 side in the present embodiment.
- the absorber main body 3m has a front side portion 3ma and a rear side portion 3mb with the central axis CW as a boundary.
- the portion 3ma on the front side is a portion having almost no extensibility in the longitudinal direction L and the width direction W.
- the rear portion 3 mb (excluding the excretory opening contact area STA in a plan view) is a portion in which the extensibility in the longitudinal direction L is higher than the extensibility in the width direction W.
- the extensibility in the longitudinal direction L Is a portion that is high and has almost no extensibility in the width direction W.
- Examples of a method for imparting extensibility include a method in which a plurality of cuts 3S extending in the width direction W are formed in the absorbent body 3m so as to be arranged in the longitudinal direction L. Thereby, when tension is applied to the absorber main body 3m in the longitudinal direction L, the break 3S expands in the longitudinal direction L, thereby exhibiting extensibility.
- the shape of the cut 3S include a straight line shape (this embodiment) and a wavy line shape.
- the individual cut lines 3S are arranged in a staggered manner in the rear portion 3mb, or the individual cut lines 3S are arranged in a staggered manner in a virtual rhombus-shaped small area, and For example, staggered arrangement of the small regions in the rear portion 3 mb (this embodiment) is possible.
- the cut 3S may be a shape having a gap such as a circular or elliptical opening (preferably having a major axis in the width direction W).
- the carrier sheet 3n has a front side portion 3na and a rear side portion 3nb with the central axis CW as a boundary.
- the front side portion 3na is a portion having almost no extensibility in the longitudinal direction L and the width direction W.
- the portion 3nb on the rear side is a portion in which the extensibility in the longitudinal direction L is higher than the extensibility in the width direction W.
- the extensibility in the longitudinal direction L is high, and there is almost no extensibility in the width direction W. It is.
- the rear portion 3nb may have stretchability in addition to stretchability.
- Examples of a method for imparting extensibility include a method of using a sheet having extensibility in a predetermined direction and not having extensibility in a direction orthogonal to the predetermined direction as the rear portion 3nb.
- a sheet that has elasticity and does not have elasticity in a direction perpendicular to the predetermined direction elasticity can be imparted.
- the front side portion 3na and the rear side portion 3nb may be a front portion and a rear portion of the same sheet, or may be formed of two types of sheets having different extensibility (or stretchability).
- the front side portion 3na uses a sheet that does not have stretchability and stretchability in any direction
- the rear side portion 3nb has stretchability in a predetermined direction.
- a sheet that does not have elasticity in the direction orthogonal to is used.
- the absorbent body main part 3 m and the carrier sheet 3 n overlap with each other, and can exhibit extensibility in the rear side portion of the absorbent article 2 (excluding the excretory opening contact area STA in a plan view).
- the absorber 3 can also exhibit stretchability because the carrier sheet 3n has stretchability.
- the absorber body 3m exhibits extensibility only by the plurality of cuts 3S, but the contractility is not always sufficient, and therefore the stretchability is not sufficient. Therefore, in the present embodiment, stretchability is imparted to the absorbent body 3 by sticking the stretchable carrier sheet 3n to the absorbent body main body 3m. Since the carrier sheet 3n is difficult to be cut by the cutting blade due to stretchability when the cut 3S is formed in the absorber body 3m, the carrier sheet 3n also has a function of preventing the shape of the absorber body 3m from being lost.
- FIG. 3 is a view showing the absorber 3, and the absorber 3 includes a main body 30a and an end extension 30b.
- the main body portion 30a includes two linear outer edges 36 and 36 parallel to each other along the longitudinal direction L of the absorber 3, and two linear virtual outer edges parallel to each other along the width direction W of the absorber 3.
- the end extending portion 30b is a portion extending outward from the end portion in the longitudinal direction L of the main body portion 30a, and is surrounded by a virtual outer edge 37 and a curved outer edge 31 substantially along the width direction W in the absorber 3. This is a convex part.
- the extended end portions 30b are formed at both ends in the longitudinal direction L of the main body portion 30a.
- the end extension 30b includes a convex curved region 32 and two concave curved regions 33a and 33b.
- the convex curved region 32 has a curved outer edge 31 c that is located at the center in the width direction W and is curved convexly with respect to the outside in the longitudinal direction L.
- the two concave curved regions 33a and 33b are located outside one end and the other end of the convex curved region 32 in the width direction W, respectively, and are curved outer edges 31a curved concavely with respect to the outside in the longitudinal direction L. , 31b.
- the outer edge 31 can be regarded as a substantially wave-like curve in which the concave outer edge 31a, the convex outer edge 31c, and the concave outer edge 31b are connected to each other in this order.
- the boundary point 34 between the convex curved region 32 and the concave curved region 33a or the concave curved region 33b, that is, the boundary point 34 between the outer edge 31c and the outer edge 31a or the outer edge 31b is exemplified as an inflection point of the curved line of the outer edge 31, for example.
- the width direction W is the x axis
- the longitudinal direction L is the y axis
- the slope of the tangent of an arbitrary point x on the curve y monotonously increases / decreases. From the point of change to the monotonic decrease / increase, that is, the inflection point at which the double differential value of y with respect to x changes from positive / negative to negative / positive.
- the width direction W passes through that point.
- the virtual line which passes along the point and is parallel to the longitudinal direction L May intersect with the curve of the outer edge 31.
- the value of the ratio is arbitrary.
- the outer edge 31 extending along the width direction W becomes a substantially wave-like curve. Therefore, the consumer recognizes the outer edge 31 as a continuous shape and, as will be described later, the width direction W of the absorbent body 3. It becomes unconscious of the center of. In other words, even if the dimension in the width direction W of the concave curved region 33a is different from the dimension in the width direction W of the concave curved region 33b, that is, the longitudinal center extending in the longitudinal direction L through the center in the width direction W of the absorber. Even if the absorber 3 is not line-symmetric with respect to the line, the difference in shape is not recognized by the consumer.
- the convex curved region 32 and the concave curved regions 33a and 33b may be configured by curves and / or straight lines indicating outer edges that curve in a convex shape and a concave shape, respectively.
- the curve includes a case where straight lines are arranged in a polygonal shape and can be regarded as a curve as a whole.
- the line which shows an outer edge is also included in the convex curve area
- the distance D between the outer edge 31 of the end extension 30b of the absorber 3, that is, the outer edge 3T1, and the outer edge 2T1 of the end edge in the longitudinal direction L of the main body 2a is not constant (FIG. 1).
- the shape of 2T1 and the shape of outer edge 3T1 are not similar to each other.
- the edge part of the main-body part 2a in the longitudinal direction L is formed of the top sheet 4 and the back sheet 5. Therefore, the distance between the outer edge of the edge part of the absorber 3 and the outer edge of the edge part in the longitudinal direction L of the top sheet 4 and the back sheet 5 is not constant, and the shapes of both the outer edges are not similar to each other. Thereby, even if the shape of the edge part of the absorber 3 shifts
- the main body portion 2a and the pair of flap portions 2b, 2b of the absorbent article 2 include a plurality of fixing portions (not shown) for fixing the absorbent article 2 to clothing on the skin surface side of the back sheet 5.
- the plurality of fixing portions of the main body 2a extend in a strip shape in the width direction W of the absorbent article 2 and are arranged at predetermined intervals in the longitudinal direction L of the absorbent article 2.
- the outer edge of the outer side of the width direction W overlaps with a part of outer edge of the width direction W of each flap part 2b.
- the absorbent article 2 may further include an auxiliary sheet (not shown) that assists the diffusion of the liquid between the top sheet 4 and the absorbent body 3.
- the auxiliary sheet has the same outer shape and cut as the absorbent body main body 3m, and can be extended in the longitudinal direction L by the cut 3S.
- the top sheet 4 and the back sheet 5 which are extensible sheets and the extensible absorbent body 3 overlap each other, and a rear side portion of the absorbent article 2 (a region where the bulky portion 20K is present in plan view). Excluding) can exhibit extensibility.
- the absorbent article 2 has a portion on the rear side of the absorbent article 2 (the excretory opening contact area STA) because the top sheet 4, the back sheet 5 and the absorbent body 3 have elasticity. Excluding) can exhibit elasticity.
- the present invention is not limited to the example, and at least the absorber 3 (rear side portion 3mb + 3nb), the top sheet 4 (rear side portion 4b) and the back sheet 5 (rear side portion 5b).
- One of them may have at least extensibility (preferably stretchability) and may overlap each other to express extensibility (preferably stretchability) in a predetermined region of the absorbent article 2 as a whole.
- the absorbent body 3m As the material for the top sheet 4, the absorbent body 3m, the carrier sheet 3n, the back sheet 5, the fixing part, and the release sheet, known materials generally used in the absorbent article 2 can be used.
- a material of the surface sheet 4 As a material of the surface sheet 4, a non-woven fabric, a woven fabric, a synthetic resin film in which liquid permeation holes are formed, and a composite sheet thereof can be cited.
- the nonwoven fabric include natural fibers, regenerated fibers, inorganic fibers, and synthetic resin fibers.
- the material for the absorber body 3m include pulp fibers, synthetic fibers, and absorbent polymers.
- the material for the auxiliary sheet include nonwoven fabric, pulp fiber, and synthetic fiber.
- Examples of the carrier sheet 3n include a synthetic resin film having elasticity in a uniaxial direction. In particular, a synthetic resin film having elasticity in one axis direction but not having elasticity in the other axis direction orthogonal to the one axis direction is preferable.
- Examples of the material for the back sheet 5 include a waterproof nonwoven fabric, a synthetic resin film, a composite sheet of a nonwoven fabric and a synthetic resin film, and an SMS nonwoven fabric.
- an adhesive such as a styrene-butadiene copolymer can be used.
- Examples of the release sheet material include a paper or resin sheet base material coated with a silicone resin release material.
- the adhesive used for joining between the top sheet 4, the (auxiliary sheet) absorber main body 3 m, the carrier sheet 3 n and the back sheet 5 is a known material generally used in the absorbent article 2.
- a thermoplastic adhesive can be used.
- a material of a packaging sheet the well-known material generally used in order to package the absorbent article 2 can be used.
- a resin film, paper, and a nonwoven fabric are mentioned.
- the absorbent article 2 of the present embodiment does not have extensibility in the excretory opening contact area STA in the front area (from the central axis CW) and in a plan view, and excludes the excretion opening contact area STA (center) It has extensibility in the region on the rear side (from the axis CW). That is, in one absorbent article 2, the stretchability is changed between the front region and the rear region. Therefore, when the absorbent article 2 is fixed to the underwear by the fixing portion, the excretory mouth is maintained while maintaining the state where the front side region and the excretion opening contact area STA of the absorbent article 2 are in contact with the body of the wearer of the underwear.
- the region on the rear side excluding the contact region STA can be extended with the movement of the body. Specifically, when the underwear wearer walks, the load applied to the absorbent article 2 with the movement of both feet is released by extending and deforming the rear side region excluding the excretion opening contact region STA, Can be absorbed. At that time, since the excretion opening contact area STA and the front area do not extend, the excretion opening contact area STA can stably adhere to the body of the wearer of the underwear, and the excretion opening contact area STA is stable to the excretion opening (vagina opening). Can adhere to each other.
- the reason is that deformations such as kinking of the rear side region are hardly transmitted to the front side region because the front side region and the excretion opening contact region STA do not have extensibility.
- the area on the front side is naturally less affected by the movement of both feet, so it is easy to stably adhere to the body, and therefore the area on the front side has a wide area that does not have stretchability. This is because the ability to prevent the transmission of deformation from the rear region can be increased.
- a rear-side region that can be extended is extended to the central axis CW on both outer sides in the width direction W of the excretory opening contact region STA, the portion is more like a fulcrum for twisting on the rear side.
- the front region and the rear region can behave differently according to the movement of the underwear wearer, thereby achieving both absorbency and wearability. Can do.
- the said mechanism is effective similarly when each member has a stretching property instead of a stretching property.
- the absorbent article 2 in this Embodiment is formed so that the surface sheet 4, the back surface sheet 5, and the absorber 3 can be extended / expandable. It does not have to be.
- FIGS. 6 to 7 are diagrams for explaining a method of manufacturing the absorbent article 2 including the absorbent body 3.
- the manufacturing method includes an absorbent body forming step, a first semi-finished product forming step, a second semi-finished product forming step, an absorbent article forming step, and a packaging step.
- the manufacturing apparatus 400 relates to conveyance of the absorbent article 2 and materials constituting the absorbent article 2 in a conveyance direction (MD direction), a transverse direction perpendicular to the conveyance direction (CD direction) along the conveyance surface, and a conveyance direction and a transverse direction. It has a vertical direction (TD direction) perpendicular to the thickness direction of the material.
- MD direction conveyance direction
- CD direction conveyance direction
- TD direction vertical direction
- Upstream side in transport direction and “downstream side in transport direction” are also simply referred to as “upstream side” and “downstream side”
- “upper side in the vertical direction” and “lower side in the vertical direction” are simply “upper side”, Also called “lower”.
- the longitudinal direction L, the width direction W, and the thickness direction T are the transport directions. , Overlap with the transverse direction and the vertical direction. Therefore, the longitudinal direction L, the width direction W, and the thickness direction T of the absorbent article 2 and the like are also referred to as a conveyance direction, a transverse direction, and an up-down direction, respectively.
- a negative pressure chamber 111N to which a negative pressure is applied and a positive pressure chamber 111P to which a positive pressure is applied are formed in the internal space of the rotating drum 111.
- a plurality of through holes (not shown) communicating with the negative pressure chamber 111N and the positive pressure chamber 111P are formed on the outer peripheral surface of the rotating drum 111.
- the pattern plate 112 has grooves (not shown) formed continuously along the outer peripheral surface.
- the groove has substantially the same shape as the shape in which the absorber 3 is connected in the width direction W, and the longitudinal direction and width direction of the groove are the circumferential direction (conveying direction) and width of the outer peripheral surface of the rotating drum 111, respectively. Parallel to the direction (transverse direction).
- the groove has air permeability, and can communicate with the negative pressure chamber 111N or the positive pressure chamber 111P by the rotation of the pattern plate 112.
- the groove is capable of receiving a fiber pile material (eg, pulp fiber, synthetic fiber, absorbent resin) supplied from the material supplier 113.
- the fiber drum material is supplied from the material supplier 113 while the rotary drum 111 is rotated in the direction of the arrow by the drive mechanism.
- the piled material accumulates in the groove communicated with the negative pressure chamber 111N in the pattern plate 112, and a single-piece absorbent body connected in the circumferential direction, that is, an absorbent body continuous body 50. Is formed.
- the pattern plate 112 reaches the positive pressure chamber 111P together with the absorber continuum 50, the absorber continuum 50 is sucked by the suction device 116 and detached from the pattern plate 112.
- the continuous auxiliary sheet SS in the form of a continuous sheet is rewound from the roll WR1 by the transport roll 117 and transported in the transport direction by the transport belt 115.
- An adhesive eg, a thermoplastic resin
- the absorber continuous body 50 is affixed on one surface of the continuous auxiliary sheet SS on the conveyor belt 115.
- continuous carrier sheets CS1 (with stretchability) and CS2 (without stretchability) are rewound from the rolls WR2a and WR2b and supplied to the conveyor belt 115.
- the continuous carrier sheets CS1 and CS2 are respectively a rear side portion 3nb and a front side portion 3na of the carrier sheet 3n.
- An adhesive is applied to one surface of the continuous carrier sheets CS1 and CS2 by an adhesive device 121.
- One surface of the continuous carrier sheets CS1 and CS2 is pressed against the upper surface of the absorbent member P1 and pasted. Thereby, as shown in FIG.6 (b), the absorber member P2 by which the continuous carrier sheets CS1 and CS2 were laminated
- the absorbent member P2 is pressed while being sandwiched between the pressing roll 131 and the anvil roll 132 in which a large number of convex portions are periodically formed on the outer peripheral surface. Thereby, the absorbent member P2 is formed to a desired thickness and adjusted to a desired fiber density (desired volume).
- the pressed absorbent member P2 is transported in the transport direction by the transport belt 133.
- the absorbent member P2 is sandwiched between the cut roll 142 and the anvil roll 141 in which a plurality of blades for forming the cut 3S of the absorbent body 3 are formed on the outer peripheral surface.
- a plurality of cuts 3S are formed.
- the absorber member P3 which has several cut
- the plurality of cuts 3S are predetermined areas corresponding to the rear part 3mb of the absorbent body member P1 (absorber continuous body 50 + continuous auxiliary sheet SS) excluding the excretory opening contact area STA of the absorbent body main body 3m. Is not formed on the continuous carrier sheets CS1 and CS2.
- linear cuts 3S extending in the circumferential direction are staggered in a virtual rhombus-shaped small area, and the rhombus-shaped areas are staggered in the circumferential direction and the width direction within the predetermined area.
- the absorber member P3 is transported in the transport direction by the transport belt 143.
- the direction in which the continuous carrier sheet CS1, the absorber continuous body 50, and the continuous auxiliary sheet SS can be extended and the conveyance direction are orthogonal to each other, so the continuous carrier sheet CS1, the absorber continuous body 50, and the continuous auxiliary sheet are being conveyed.
- SS does not expand.
- the absorbent member P3 is transported while being sucked to the outer peripheral surface of the anvil roll 152, and in the transverse direction for each width of the absorbent body 3 by the cutting blade of the cutter roll 151. Disconnected. Thereby, it becomes the absorber member P3 separated into the shape of the absorber 3.
- the absorber member P3 is substantially the absorber 3.
- the absorbent member P3 is delivered to the transport roll 164.
- the above-described absorber forming step can be referred to as an absorber manufacturing method.
- the process in which the fiber stacking apparatus 110 forms the absorber continuous body 50 is a formation process of the absorber continuous body 50, and is also a preparatory process for preparing the absorber continuous body 50.
- the process in which the cutting device 153 cuts the absorbent member P3 (absorber continuous body 50) in the transverse direction and separates it into the shape of one absorbent body 3 is a cutting process for cutting the absorbent continuous body 50. Can do.
- the continuous surface sheet TS in the form of a continuous sheet is rewound from the roll WR3, subjected to a gear stretching process, and formed into a stretchable continuous sheet.
- the pair of gear rolls 161 and 162 includes teeth only in a region corresponding to the rear portion 4b of the top sheet 4 in the outer peripheral surface. Therefore, in the continuous surface sheet TS, the stretchability is expressed in the portion TS1 corresponding to the rear portion 4b of the topsheet 4, and the stretchability is not expressed in the portion TS2 corresponding to the front portion 4a.
- the continuous surface sheet TS after being stretched is applied to one side with an adhesive (for example, thermoplastic resin) by an adhesive device 163 and supplied to the conveyor belt 165.
- an adhesive for example, thermoplastic resin
- the continuous surface sheet TS does not expand during the transport.
- the surface of the individual absorbent member P3 supplied from the transport roll 164 on the side of the continuous auxiliary sheet SS is pressed and attached to one surface of the continuous surface sheet TS.
- absorber member P3 with continuous surface sheet TS, ie, the 1st semi-finished product P4 is formed.
- the first semi-finished product P4 is supplied to the squeezing device 170 by the conveyor belt 165.
- the first semi-finished product P4 is sandwiched between the squeezing roll 171 and the anvil roll 172 each having a convex part having a shape corresponding to the squeezing part 26 on the outer peripheral surface, and the squeezing part 26 is formed.
- the first semi-finished product P4 which has the pressing part 26 is formed.
- the first semi-finished product P4 is transported in the transport direction by the transport belt 184.
- the step of pressing and adhering the absorbent member P3 (absorber 3) to the continuous surface sheet TS (surface sheet 4) can be referred to as a surface sheet lamination step.
- the process of forming the pressing part 26 in the laminated body of continuous surface sheet TS and the absorber member P3 can be called an embossing (squeezing) process.
- the continuous back sheet BS in the form of a continuous sheet is rewound from the roll WR4, subjected to a gear stretching process, and formed into a stretchable continuous sheet.
- the pair of gear rolls 181 and 182 includes teeth only in a region corresponding to the rear portion 5b of the back sheet 5 in the outer peripheral surface. Therefore, in the continuous back sheet BS, the stretchability is expressed in the part BS1 corresponding to the rear part 5b of the back sheet 5, and the stretchability is not expressed in the part BS2 corresponding to the front part 5a.
- the continuous back sheet BS does not expand during conveyance.
- a first semi-finished product P4 having an adhesive applied to the upper surface by the adhesive device 183 is supplied from the transport belt 184.
- the continuous back sheet BS is pressed and pasted on the upper surface of the first semi-finished product P4.
- the pressing part 26 is abbreviate
- the second semi-finished product P5 is transported in the transport direction by the transport belt 187.
- the process of affixing continuous surface sheet TS (surface sheet 4) to said absorber member P3 (absorber 3) and the process of affixing continuous back surface sheet BS (back surface sheet 5) to them are the surface sheet to absorber 3. 4 and the back sheet 5 can be viewed as a lamination process.
- the continuous release sheet CT unwound from the roll WR5 is coated with an adhesive (fixing portion) in a predetermined shape by the adhesive device 195 on one surface, and the cutter roll 191 and the anvil roll By 192, it is cut into a predetermined size to form a release sheet.
- the release sheet is supplied between the anvil roll 192 and the pressing roll 193.
- the second semi-finished product P5 is supplied from the conveyor belt 187 between the anvil roll 192 and the pressing roll 193. Then, between the anvil roll 192 and the pressing roll 193, the release sheet is pressed against the upper surface of the second semi-finished product P5, and the release sheet is attached to the second semi-finished product P5. Thereby, the 2nd semi-finished product P5 with a peeling sheet is formed.
- the second semi-finished product P5 with the release sheet is supplied to the peripheral sealing device 200 by the transport belt 194.
- the second semi-finished product P5 is supplied between the heating roll 201 and the anvil roll 202, and is heated by the heating roll 201 so as to be edged in the shape of the absorbent article 2. Heat sealed. Thereby, the heat-sealed second semi-finished product P5 is formed. An absorber is contained inside the heat seal. The heat-sealed second semi-finished product P5 is conveyed to the widening device 210.
- the second semi-finished product P5 conveyed from the peripheral sealing device 200 is supplied between a plurality of pairs of widening rolls 211, 212, and a plurality of sets of pair of widening rolls 211, Each of 212 is slightly widened in the transverse direction, and the cut 3S is appropriately cut. Thereby, the smooth expansion and contraction of the second semi-finished product P5 is surely possible.
- the second semi-finished product P6 is transported to the flap fixing part forming device 220 by the transport belt 213.
- the continuous sheet-like continuous release sheet FT unwound from the roll WR6 is coated with an adhesive (fixing part) in a predetermined shape on one surface by the bonding device 225, and the cutter It is cut into a predetermined size by a roll 221 and an anvil roll 222 to form a release sheet.
- the release sheet is supplied between the anvil roll 222 and the pressing roll 223.
- the second semi-finished product P5 is transported from the transport belt 213.
- the release sheet is pressed against the upper surface of the second semi-finished product P5 and pasted. Thereby, the second semi-finished product P6 is formed (FIG. 7B).
- the second semi-finished product P6 is transported to the peripheral cutting device 230 by the transport belt 224.
- the second semi-finished product P6 is individually cut by the cutting blade of the cutter roll 231 while being sucked and conveyed to the outer peripheral surface of the anvil roll 232, and the shape of the absorbent article 2
- the second semi-finished product P7, that is, the absorbent article 70 is separated.
- the absorbent article 70 is delivered from the anvil roll 232 to the transfer device 240.
- the step of cutting the second semi-finished product P6 into the shape of the absorbent article 2 is regarded as a cutting-out step of cutting out the topsheet 4 (continuous topsheet TS) and the backsheet 5 (continuous backsheet BS) into a product shape. Can do.
- the packaging process performed with the packaging unit 400E is demonstrated.
- the transfer device 240 the continuous sheet-like continuous packaging sheet HS that has been rewound from the roll WR 7 is wound on the transfer roll 242 with an adhesive applied to one surface by the contact bonding device 244.
- the second semi-finished product P7 conveyed from the peripheral cutting device 230 is conveyed while being sucked to the outer peripheral surface of the transfer roll 241 and delivered to the transfer roll 242.
- one surface of the continuous packaging sheet HS is pressed against the upper surface of the second semi-finished product P7, and the continuous packaging sheet HS is attached to the second semi-finished product P7.
- the 2nd semi-finished product P7 with continuous packaging sheet HS is formed.
- the packaged absorbent article 2 is manufactured.
- the manufacturing method of the absorbent article of the present embodiment is limited to the above method as long as it includes the manufacturing method of the absorbent body that forms the absorbent body whose dimensions in the transport direction are shorter than the dimensions in the transverse direction. It is not something.
- FIG. 8 is a view showing the absorbent body continuum 50, and the absorbent body continuum 50 includes a main body 50a and an end extension 50b.
- the main body 50a is a belt-like portion extending in the transport direction, surrounded by two linear outer edges 57, 57 parallel to each other along the transport direction in the absorber continuous body 50.
- the end extending portion 50b is a portion extending outward from the end portion in the transverse direction of the main body portion 50a, and is surrounded by a virtual outer edge 57 and a curved outer edge 51 substantially along the conveying direction in the absorber continuous body 50. This is a convex part.
- the extended end portions 50b are formed at both end portions in the transverse direction of the main body portion 50a.
- the end extending part 50 b includes a convex curved region 52 and a concave curved region 53.
- the convex curved region 52 has an outer edge 51c that is convexly curved with respect to the outer side in the transverse direction.
- the concave curved region 53 has a curved outer edge 51d that is concavely curved with respect to the outside in the transverse direction. Therefore, the outer edge 51 can be regarded as a substantially wave-like curve in which the convex outer edge 51c and the concave outer edge 51d are alternately connected.
- the boundary point 54 between the convex curved region 52 and the concave curved region 53 that is, the boundary point 54 between the outer edge 51 c and the outer edge 51 d is the same as the boundary point 34.
- one absorbent body 55 (corresponding to the absorbent body 3) in the transport direction in the concave curved region 53. ) In the transverse direction at intervals of width.
- the cutting position is set so as to pass through the concave curved region 53. For example, if the positions of the outer edges 56, 56 in the figure are taken, the range defined by the outer edges 56, 56 is one absorber 55, That is, the absorber 3 is obtained.
- the concave curved region 53 is divided into an upstream concave curved region 53b and a downstream concave curved region 53a, and the outer edge 51d is divided into an upstream outer edge 51b and a downstream outer edge 51a.
- a region surrounded by the outer edges 56 and 56 and the outer edges 57 and 57 is a main body 30a, and a region surrounded by the outer edges 51a, 51c and 51b and the outer edge 57 is an end extending portion 30b.
- the convex curved region 52 and the concave curved regions 53a and 53b correspond to the convex curved region 32 and the concave curved regions 33a and 33b, respectively.
- an absorbent body of an absorbent article one having an arc-shaped end extending portion extending outward from the end portion at a longitudinal end portion is generally used.
- the end extension part has a larger amount of absorption compared to a rectangular absorbent body that does not have an end extension part, and is adapted to the outer shape of a rounded rectangle or a long elliptical product in the front and rear. It is formed by.
- the extended part has a line-symmetric shape with respect to the longitudinal center line. The reason is that, when the end extending portion has an asymmetric shape with respect to the longitudinal center line, an impression as if it is a defective product can be given to the consumer.
- a belt-shaped absorbent body continuous body in which the absorbent body is connected in the transport direction is prepared, and the absorbent body continuous body is transported in the transport direction.
- a method of cutting in the transverse direction at intervals of dimensions is used.
- FIG. 9 is a diagram schematically showing an example of a method for producing an absorbent body.
- an absorber having a rounded rectangular shape will be described.
- the absorber continuous body 150 is prepared first.
- the absorber continuum 150 has a belt-like shape in which the outer edges 156 at the ends in the width direction of the absorber 155 are connected to each other in the transport direction. And it cut
- the absorbent body 103a (outer edges 136a, 131a manufactured as shown in FIG. 9B is used. ) Has an appropriate rounded rectangular shape. This shape is line symmetric with respect to the longitudinal center line Cx passing through the top TP1 of the outer edge 131a1.
- the absorber 103b (outer edges 136b and 131b) manufactured as shown in FIG. 9C is used.
- This shape is asymmetric with respect to the longitudinal center line Cx passing through the top TP1 of the outer edge 131b.
- a part G1 of the end extension portion for the adjacent absorber is added at the end portion in the longitudinal direction on one end side in the width direction.
- a portion G1 of the end extension has a unique shape and is very conspicuous, and emphasizes an asymmetric shape. It is considered that a consumer who sees such an asymmetrical absorber 103b through the top sheet recognizes the absorbent article as a defective product even if there is no problem in the absorption performance.
- FIG. 10 is a diagram schematically showing another example of a manufacturing method of an absorber.
- an absorber having a shape in which an arcuate shape extends from a short side of a rectangle will be described.
- Fig.10 (a) while preparing the absorber continuous body 150 and conveying the absorber continuous body 150 in a conveyance direction, one absorber 155 of Cutting is performed in the transverse direction at cutting positions 157 (157a and 157b) set for each dimension interval.
- cutting position 157a and the position of the outer edge 156 substantially overlap each other as in the left part of FIG. 10A, the absorbent body 103a (outer edges 136a, 131a manufactured as shown in FIG.
- the outer edge 131b2 and the outer edge 131b3 have an asymmetric shape, and as a result, the consumer easily recognizes that the arcuate outer edge 131b1 is in an asymmetric position. It is considered that a consumer who sees such an asymmetrical absorber 103b through the top sheet recognizes the absorbent article as a defective product even if there is no problem in the absorption performance.
- FIG. 11 is a diagram schematically showing still another example of the manufacturing method of the absorber.
- This example is basically the same as the example of FIG. However, it differs from the example of FIG. 10 in that the height of the convex shape of the arcuate shape is higher in the shape of the absorber.
- the absorbent body 103b (outer edges 136b and 131b) manufactured as shown in FIG. 11C has an arcuate outer edge 131b1 toward the left side.
- 131b2 has a short shape and outer edge 131b3 has a long shape.
- both the outer edges 136b are used as a reference, and the straight line length of the outer edge 131b2 is compared with the straight line length of the outer edge 131b3.
- the difference in height is easily recognized by consumers.
- human eyes tend to recognize the top of the convex shape as the center of the whole.
- the height of the arcuate outer edge 131b1 in the longitudinal direction is high, and therefore it is recognized that the position of the top portion TP1 should be at the center in the width direction of the absorber 103b.
- the outer edge 131b2 and the outer edge 131b3 are not only recognized to be asymmetrical shapes, but it is easy that the top portion TP1 of the arcuate outer edge 131b1 that should be at the center in the width direction of the absorber 103b is not at the center. Be recognized. It is considered that a consumer who sees such an asymmetrical absorber 103b through the top sheet recognizes the absorbent article as a defective product even if there is no problem in the absorption performance.
- the deviation between the cutting position 157b and the position of the outer edge 156 in the description of FIG. 9 to FIG. 11 described above is a manufacturing method of an absorbent body that forms an absorbent body whose dimension in the transport direction is shorter than that in the transverse direction. This is likely to occur in a horizontal flow manufacturing method in which the width direction is the conveyance direction. And since the dimension of the width direction of an absorber is smaller than the dimension of a longitudinal direction, if a position shift generate
- the shape of the absorber is as shown in FIG. 3, and the shape of the absorber continuum is as shown in FIG.
- FIG. 12 is a diagram schematically showing a method for manufacturing the absorber.
- the absorber continuous body 50 is prepared first.
- the absorber continuous body 50 has a belt-like shape in which the outer edges 56 at the end portions in the width direction of the absorber 55 are connected to each other in the transport direction.
- the absorbent continuous body 50 is cut in the transverse direction at the cutting positions 57 (57a and 57b) set at intervals of the size of the absorber 55 for one piece.
- the absorbent body 3a manufactured as shown in FIG. Concave curves-convex curves-concave curves are arranged in this order at both ends of the direction (FIG. 3). That is, the absorbent body 3a has a shape surrounded by two linear outer edges 36a, 36a parallel to each other along the longitudinal direction and a concave-convex-concave curved outer edge 31a substantially along the width direction. This shape is axisymmetric with respect to the longitudinal center line Cx passing through the top TP2 of the outer edge 31a.
- the outer edge 31b has a shape that is continuously arranged along the width direction (conveyance direction) such as concave-convex-concave.
- the top portion TP2 of the convex curve may be conspicuous and recognized as the center in the width direction of the absorber 3b.
- a consumer who sees a concave-convex-concave continuous shape recognizes it as part of a continuous pattern and is not conscious of the concept of center.
- the outer edge 31b of the absorber 3b becomes unaware of where the center in the width direction is.
- the center of the width direction (conveying direction) of the absorbent body 3b can be prevented from impressing the consumer by the visual effect of the convex curved area 32 and the concave curved areas 33a and 33b.
- the cutting position in the transport direction is shifted, and the top portion TP2 of the convex curved region 32 is not positioned at the center in the transport direction (width direction) of the absorbent body, and is symmetrical with respect to the longitudinal center line Cx of the absorbent body 3b.
- FIG. 13 is a view showing a preferred form of the absorbent body according to the present embodiment.
- the outer edge (outline) 51c of the convex curved region 52 is preferably composed of a convex curve, or a convex curve and a straight line.
- the outer edge (outline) 51d of the concave curved region 53 is constituted by a concave curve, or a concave curve and a straight line.
- the angle ⁇ at which the tangent of an arbitrary point t11 and the tangent of another arbitrary point t12 intersect is preferably 150 degrees or more and 210 degrees or less.
- the angle ⁇ at which the tangent of an arbitrary point t21 and the tangent of another arbitrary point t22 intersect is preferably 150 degrees or more and 210 degrees or less.
- the degree of convex curvature or concave curvature in the convex curved region 52 or the concave curved region 53 can be made small and moderate.
- the center in the width direction W at the edge portion in the longitudinal direction L of the absorbent body 3 can be made less impressive.
- the cutting position in the cutting process is shifted, and even if the top portion TP0 (TP2) of the convex curved region 32 (52) is not located at the center in the width direction W (conveying direction) of the absorber 3, the convex portion The top portion TP0 of the curved region 32 can be hardly seen as the center of the absorber 3, or the top portion TP0 of the convex curved region 32 can be made inconspicuous. That is, even if the cutting position is shifted, it is difficult to recognize the positional shift.
- FIG. 14 is a view showing another preferred embodiment of the absorber according to the present embodiment.
- the radius of curvature R2 at an arbitrary point t23 of the outer edge (outline) 51d of the concave curved region 53 in the absorber continuum 50 is larger than the radius of curvature R1 at an arbitrary point t13 of the outer edge (outer shape) 51c of the convex curved region 52. Larger is preferred.
- the change in the outer edge (outline) 51d of the concave curved region 53 is gentler or gentler than the change in the outer edge (outline) 51c of the convex curved region 52 by having the above configuration. It is. Thereby, even if the cutting position is deviated, it can be seen that there is no relative difference in shape compared to when the position is not deviated, and it is difficult to recognize the positional deviation.
- the radius of curvature at an arbitrary point on each of the outer edge (outline) 51c of the convex curve region 52 and the outer edge (outline) 51d of the concave curve region 53 is an absorber. It is preferable that A is 3 or less and 3A or less, where A is the dimension of 3 in the transport direction (width direction W).
- the radius of curvature at an arbitrary point on each of the outer edge (outline) 51c of the convex curve region 52 and the outer edge (outline) 51d of the concave curve region 53 is set to A or more.
- the degree of convex curvature or concave curvature in the convex curved region 52 or the concave curved region 53 can be made small and moderate. Thereby, when the absorber 3 is formed, the center of the width direction W (conveyance direction) of the absorber 3 can be made less impressive.
- the curvature radius to 3 A or less, the convex curve can be rounded to some extent at the top of the convex curve region 52 (32). Thereby, when the absorber 3 is formed, a sufficiently large edge portion can be secured. Accordingly, it is possible to achieve both the difficulty of recognizing misalignment and the high absorption performance.
- FIG. 15 is a view showing another preferred embodiment of the absorber according to the present embodiment.
- the concave curved region passes through the junction (boundary point 54) between the outer edge (outline) 51c of the convex curved region 52 and the outer edge (outline) 51d of the concave curved region 53 and is based on the virtual line VL parallel to the transport direction.
- the distance in the transverse direction between the most concave position (bottom part) 53 and the virtual line VL is the concave dimension d2
- the distance in the transverse direction between the most convex position (top part) of the convex curved region 52 and the virtual line VL is the convex dimension.
- the concave dimension d2 in the transverse direction is preferably smaller than the convex dimension d1.
- the degree of the concave curvature of the concave curved region 53 is small, and therefore, the vicinity of the center of the concave curved region 53 in the transport direction, that is, the bottom of the concave curved region 53.
- the change in the dimension in the transverse direction becomes smaller with respect to the change in the position in the transport direction. Therefore, even if the cutting position is shifted upstream or downstream in the transport direction, the change in the longitudinal dimension of the absorbent body 3 in the concave curved region 53 is small and inconspicuous. Can be difficult.
- FIG. 16 is a diagram showing another preferred embodiment of the absorbent body according to the present embodiment.
- the outer edge (outline) 51d of the concave curved region 53 is an arc of a circle S2 (FIG. 16 (a)) having a center O2 outside the end edge in the transverse direction of the absorber continuum 50, and the absorber continuum. It is preferable to include at least one of the arcs of the ellipse S2 (FIG. 16 (b)) having the focal point F02 outside the 50 transverse edges.
- the outer edge (outline) 51c of the convex curved region 52 is an arc of a circle S1 (FIG.
- the top portion TP0 (TP2) of the convex curved region 32 (52) can hardly be seen from the center in the width direction (conveying direction) of the absorber 3, or
- the top portion TP0 (TP2) can be made inconspicuous. That is, even if the cutting position is deviated, the misregistration can be hardly recognized.
- FIG. 17 is a view showing another preferred embodiment of the absorber according to the present embodiment.
- the ratio of the minimum dimension Lmin to the maximum dimension Lmax in the transverse direction of the absorber continuum 50 is preferably 0.8 to 0.95.
- the ratio between the maximum dimension Lmax in the transverse direction (near the top of the convex curved region 52) and the minimum dimension Lmin (near the bottom of the concave curved region 53) is set to a predetermined range close to 1.
- the degree of convex curvature and the degree of concave curvature can be made small and gentle.
- the center of the absorbent body 3 in the width direction W (conveyance direction) can be made less impressive.
- the cutting position in the cutting process is shifted, and even if the top portion TP0 (TP2) of the convex curved region 32 (52) is not located at the center in the width direction W (conveying direction) of the absorber 3, the convex portion
- the top portion TP0 (TP2) of the curved region 32 (52) can be hardly seen as the center of the absorber 3, or the top portion TP0 (TP2) of the convex curved region 32 (52) can be made inconspicuous. That is, even if the cutting position is shifted, the positional shift can be hardly recognized.
- the convex curved region becomes too large and the top thereof is easily recognized as the center of the absorber.
- the above ratio is larger than 0.95, the end edge portion becomes too flat and the shape of the absorber becomes almost rectangular.
- the outer edge (outline) 51 of the end edge in the transverse direction of the absorber continuum 50 preferably has a shape of a sine wave or a composite wave of a plurality of sine waves. .
- the outer edge 51 since the end portion of the absorbent body continuous body 50 in the transverse direction, that is, the outer edge 51 has the shape of a sine wave or a synthesized wave thereof, The shape can remind the consumer of a continuous shape, and the end in the longitudinal direction L can appear to have no center in the width direction W (conveyance direction). Therefore, even if the cutting position is shifted, it is difficult to recognize the positional shift.
- a processing step is further provided between the preparation step and the cutting step for performing predetermined processing for each region of the absorber continuum 50 to be the absorber.
- the processing step for example, the absorber continuous body 50 is pressed to adjust the thickness (or the fiber density), or a slit (slit) is formed in the absorber continuous body 50 to absorb the absorber.
- a cut forming process that makes the film stretchable. Since the rigidity and elongation rate of the absorbent body continuum 50 are changed by these processing steps, a shift in the position of the absorbent body continuum 50 in the transport direction is more likely to occur in the subsequent processes. Therefore, the manufacturing method of the absorbent body can make it difficult to recognize misalignment including misalignment occurring in the machining process by performing such a machining process before the cutting process.
- the preparation step includes an absorber material continuous body in which an absorber material (example: stacking material) that is a material of the absorber 3 extends in a belt shape in the transport direction. It is preferable to further include a forming step of forming the absorbent body continuous body 50 by cutting the end extending portions in the transverse direction so as to have the shapes of the concave curved region 53 and the convex curved region 52. For example, a cutting device in which a cutter roll and an anvil roll are arranged facing each other is used.
- the cutter roll includes teeth capable of cutting out the collection material continuous body so that the end portions in the transverse direction of the collection material continuous body have the shapes of the concave curved region 53 and the convex curved region 52.
- the absorber continuum 50 can be obtained comparatively easily by using the above-described configuration. As a result, the effect of making it difficult to recognize misalignment can be more easily exhibited.
- the absorbent material which is a material of the absorber in the preparation step, is piled on a pattern plate having a concave curved region and a shape corresponding to the convex curved region at the end in the transverse direction.
- the method further includes a forming step of forming the absorber continuous body.
- the above-described manufacturing method of the absorbent body is performed to obtain the absorbent body 3 (absorbent body forming process), and the top sheet 4 (continuous) is formed on the absorbent body 3.
- the distance between the outer edge of the absorbent body in the longitudinal direction (transverse direction) and the outer edge of the top end of the top sheet in the longitudinal direction (cross direction) is constant
- the position shift of the end portion of the absorber may be conspicuous.
- the distance between these outer edges is made not constant. Thereby, it is possible to make it difficult to recognize the displacement of the absorber.
- the laminating step includes a surface sheet laminating step of laminating a surface sheet (continuous surface sheet TS) on the absorbent body 3 immediately after the cutting step, and a surface Immediately after the sheet laminating step, an embossing step of embossing the laminated body of the absorbent body 3 and the surface sheet (continuous surface sheet TS) is further provided.
- a surface sheet laminating step of laminating a surface sheet (continuous surface sheet TS) on the absorbent body 3 immediately after the cutting step and a surface Immediately after the sheet laminating step, an embossing step of embossing the laminated body of the absorbent body 3 and the surface sheet (continuous surface sheet TS) is further provided.
- the positional deviation in the width direction of the embossed portion in the absorbent body is easily recognized by the consumer due to the relationship with the position of the side edge in the width direction of the absorbent body.
- the surface sheet laminating step and the laminate embossing step are performed, thereby preventing misalignment from becoming larger due to other steps.
- the effect of making it difficult to recognize misalignment can be more stably exhibited.
- the method for manufacturing an absorbent article as a more preferable aspect, only the surface sheet 4 is present on the skin side of the absorbent body 3.
- the consumer can easily visually recognize the shape of the absorbent body through the surface sheet. In such a case, the consumer can easily recognize the displacement of the absorber. Therefore, in the manufacturing method of the present absorbent article, even in such a case, the effect of making it difficult to recognize misregistration can be exhibited more significantly by applying this manufacturing method.
- the direction in which the absorbent article 2 becomes the width direction W when the absorbent article 2 is completed (the direction in which extensibility is relatively lowered)
- the absorbent member such as the body 50 and the continuous carrier sheet CS and the stretchable continuous sheet such as the continuous topsheet TS and the continuous backsheet BS are set in a direction in which the extensibility is low, and the direction is defined as the conveying direction.
- the continuous sheet is conveyed.
- the absorbent member and the stretchable continuous sheet have relatively low stretchability in the transport direction, so that each absorber member and the stretchable continuous sheet is stretched when pulled in the transport direction during transport. Can be suppressed.
- the processing position in the conveying direction can be stabilized in the processing steps of the absorbent member and the stretchable continuous sheet, and the product is distorted or dimensional variation occurs when the absorbent article is finally completed. Can be prevented.
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Abstract
Description
(1)吸収性物品用の吸収体の製造方法であって、前記吸収体の材料が帯状に延在する吸収体連続体を準備する準備工程と、前記吸収体連続体を、搬送方向に搬送しつつ、前記搬送方向に直交する横断方向の寸法よりも前記搬送方向の寸法が短い吸収体を形成するように、前記横断方向に沿って切断する切断工程と、を備え、前記吸収体連続体の前記横断方向の端延部は、前記横断方向の外側に対して凸に湾曲した外縁を有する凸湾曲領域と、前記横断方向の外側に対して凹に湾曲した外縁を有する凹湾曲領域と、を有し、前記凸湾曲領域と前記凹湾曲領域とが前記搬送方向に沿って交互に配置されており、前記切断工程は、前記吸収体連続体を、前記凹湾曲領域において切断する工程を含む、吸収体の製造方法。
本吸収体の製造方法では、凸湾曲領域や凹湾曲領域における外形線の任意の点での接線同士の交差角度が比較的大きな鈍角となるようにその角度範囲が限定されている。そのため、凹湾曲領域や凸湾曲領域において凸の湾曲や凹の湾曲の程度の程度を小さく緩やかにできる。その結果、吸収体が形成されたとき、吸収体の幅方向(搬送方向)の中心をより印象付けないようにできる。それにより、切断工程での切断の位置がずれてしまい、凸湾曲領域の頂部が吸収体の幅方向(搬送方向)の中心に位置しなくても、凸湾曲領域の頂部を吸収体の中心とは見え難いくでき、又は、その凸湾曲領域の頂部を中心としては目立たなくできる。すなわち、切断の位置がずれたとしても、位置ずれを認識され難くできる。
本吸収体の製造方法では、凹湾曲領域や凸湾曲領域が円弧や楕円の弧を含んでおり、それにより、凹湾曲領域や凸湾曲領域において凹や凸の湾曲の程度を小さく緩やかにできる。そのため、吸収体の幅方向(搬送方向)の中心を印象付けないようにできる。それにより、切断工程での切断の位置がずれても、凸湾曲領域の頂部が吸収体の幅方向(搬送方向)の中心とは見え難いくでき、又は、その頂部を目立たなくできる。すなわち、切断の位置がずれたとしても、位置ずれが認識され難くできる。
本吸収体の製造方法では、切断工程で切断が行われる凹湾曲領域の外形線の任意の点の曲率半径が、切断が行われない凸湾曲領域の外形線の任意の点の曲率半径よりも大きい。すなわち凹湾曲領域の外形線の変化は凸湾曲領域の外形線の変化よりも緩やか又はなだらかである。それにより、切断の位置がずれたとしても、位置がずれていないときと比較して、相対的に形状に差がないように見せることができ、位置ずれを認識し難くできる。
本吸収体の製造方法では、凸湾曲領域や凹湾曲領域における外形線の任意の点での曲率半径がA以上であるため、凹湾曲領域や凸湾曲領域において凸の湾曲や凹の湾曲の程度の程度を小さく緩やかにできる。それにより吸収体が形成されたとき、吸収体の幅方向(搬送方向)の中心をより印象付けないようにできる。一方、その曲率半径が3A以下であるため、凸湾曲領域の頂部において凸の湾曲にある程度以上の丸みを持たせることができる。それにより吸収体が形成されたとき、吸収体の大きさを十分な大きさに維持できる。それらにより位置ずれの認識され難くさと、吸収性能の高さとを両立させることができる。
本吸収体の製造方法では、横断方向における最大寸法(凸湾曲領域の頂部)と最小寸法(凹湾曲領域の底部)との比が1に近い所定の範囲内であるので、凸湾曲領域や凹湾曲領域において凸の湾曲の程度や凹の湾曲の程度を小さく緩やかにできる。その結果、吸収体が形成されたとき、吸収体の幅方向(搬送方向)の中心をより印象付けないようにできる。それにより、切断工程での切断の位置がずれてしまい、凸湾曲領域の頂部が吸収体の幅方向(搬送方向)の中心に位置しなくても、凸湾曲領域の頂部を吸収体の中心とは見え難いくでき、又は、その凸湾曲領域の頂部を中心としては目立たなくできる。すなわち、切断の位置がずれたとしても、位置ずれを認識され難くできる。
本吸収体の製造方法では、横断方向における凹湾曲領域の凹寸法は凸湾曲領域の凸寸法よりも小さいので、凹湾曲領域の凹の湾曲は目立たなくなり、凹湾曲領域における搬送方向の中央付近では横断方向の寸法の変化が小さくなる。そのため搬送方向の前方側又は後方側に切断の位置がずれても、凹湾曲領域での吸収体の長手方向の寸法の変化が小さく、目立ち難いため、その位置ずれを消費者により認識し難くすることができる。
本吸収体の製造方法では、吸収体連続体の横断方向の端延部が正弦波又はその合成波の形状を有するため、切り出された吸収体において、その波形状が消費者に連続的な形状を想起させて、その長手方向の端部に幅方向(搬送方向)の中心が無いように見せることができる。そのため、切断の位置がずれたとしても、位置ずれを認識し難くできる。
一般に吸収性物品の使用目的に応じて吸収体に付与する機能が異なる。そのため吸収体にその異なる機能を付与するために、吸収体連続体に所定の加工工程(例示:スリット形成加工、押圧加工)を実施することがある。そのときその加工工程により吸収体連続体の剛性や伸び率が変化するため、その後の工程では吸収体連続体の搬送方向の位置のずれがより発生し易くなる。そこで本吸収体の製造方法はその加工工程を切断工程の前に行うことで、加工工程で生じる位置ずれを含めた位置ずれを認識し難くすることができる。
本吸収体の製造方法では帯状の吸収体材料連続体における横断方向の端延部を凹湾曲領域及び凸湾曲領域の形状に切り出すことで、比較的容易に吸収体連続体を得ることができる。それにより、位置ずれを認識し難くできる効果をより容易に発揮することができる。
本吸収体の製造方法では、吸収体材料をパターンプレートに積繊することで、比較的安定的に吸収体連続体を得ることができる。それにより、位置ずれを認識し難くできる効果をより安定的に発揮することができる。
設計上、吸収体の長手方向(横断方向)の端部の外縁と、表面シートの長手方向(横断方向)の端部の外縁との距離が一定である場合、例えば両端部が互いに相似形であったり、互いに平行であったりする場合、製造時に吸収体が表面シートと積層されたとき、吸収体の端部の位置ずれが目立つおそれがある。そこで本吸収性物品の製造方法では、それら外縁同士の間の距離を一定でないようにしている。それにより吸収体の位置ずれをより認識し難くできる。
一般に、吸収体におけるエンボス加工部の幅方向の位置ずれは、吸収体の幅方向の側縁の位置との関係で、消費者に認識され易い。そこで本吸収性物品の製造方法では、切断工程の直後に、表面シートの積層工程及び積層体のエンボス工程を行うことで、他の工程が介在して位置ずれがより大きくなることを防止して、位置ずれを認識し難くできる効果をより安定的に発揮することができる。
一般に、吸収性物品における吸収体の肌側に表面シートしかない場合、消費者は吸収体の形状を表面シートを介して視認し易い。そのような場合、消費者は吸収体の位置ずれを認識し易くなる。そこで本吸収性物品の製造方法では、このような場合にも本製造方法を適用することにより、位置ずれを認識し難くできる効果をより顕著に発揮できる。
測定対象の部材やシートから長さ150mm×幅25mmの短冊状の試験片を切り取って、測定用試料とする。そして、測定用試料を、最大荷重容量が50Nであるロードセルを備えた引張試験機(島津製作所(株)製、オートグラフ、型式AGS-1kNG)を使用して、3つの測定用試料について、100mmのチャック間距離、100mm/分の引張速度の条件で引張伸度を測定する。3つの測定用試料の引張伸度の平均値を引張伸度とする。
ただし、本実施の形態の吸収性物品の製造方法は、横断方向の寸法よりも搬送方向の寸法が短い吸収体を形成する吸収体の製造方法を含むものであれば、上記の方法に限定されるものではない。
図8は吸収体連続体50を示す図であり、吸収体連続体50は、本体部50aと、端延部50bと、を備える。本体部50aは、吸収体連続体50における搬送方向に沿う互いに平行な直線状の二本の外縁57、57で囲まれた、搬送方向に延在する帯状の部分である。端延部50bは、本体部50aの横断方向の端部から外側に延出する部分であり、仮想の外縁57と、吸収体連続体50における概ね搬送方向に沿う曲線状の外縁51とで囲まれた凸形状の部分である。本実施の形態では、端延部50bは本体部50aの横断方向の両端部にそれぞれ形成される。
ここで、図9(a)の左側の部分のように、切断位置157aと外縁156の位置とがほぼ重なる場合、図9(b)に示すように製造された吸収体103a(外縁136a、131a)は、適正な角丸長方形の形状を有する。この形状は外縁131a1の頂部TP1を通る長手方向中心線Cxに対して線対称である。
しかし、図9(a)の右側の部分のように、切断位置157bと外縁156の位置とがずれた場合、図9(c)に示すように製造された吸収体103b(外縁136b、131b)は、角丸長方形において幅方向の一端側に余計な部分が付加され、他端側に一部欠損が生じた形状を有する。この形状は外縁131bの頂部TP1を通る長手方向中心線Cxに対して非対称である。その上、幅方向の一端側の長手方向の端部において、隣接する吸収体用の端延部の一部分G1が付加されている。その端延部の一部分G1は特異な形状であり非常に目立つ存在であり、非対称な形状を強調している。このような非対称な吸収体103bを表面シート越しに見た消費者は、吸収性能に問題が無くても、この吸収性物品を不良品と認識すると考えられる。
ここで、図10(a)の左側の部分のように、切断位置157aと外縁156の位置とがほぼ重なる場合、図10(b)に示すように製造された吸収体103a(外縁136a、131a)は、長方形の短辺から弓形形状が小さく延出した適正な形状を有する。この弓形形状の外縁131a1の位置及び形状、並びに、その両側の外縁131a2、131a3の位置及び長さは、弓形形状の外縁131a1の頂部TP1を通る長手方向中心線Cxに対して線対称である。
しかし、図10(a)の右側の部分のように、切断位置157bと外縁156の位置とがずれた場合、図10(c)に示すように製造された吸収体103b(外縁136b、131b)は、弓形形状の外縁131b1が左側に寄り、外縁131b2の長さが短く、外縁131b3の長さが長いという非対称な形状を有する。この場合、図9(c)のような非常に目立つ延出部の一部分G1のような特異な形状は存在しないので、非対称な形状は目立ち難いとも考え得る。しかし、人間の目は、一般的に横方向の直線の長さの差を強く認識する傾向がある。ここで、図10(c)の吸収体103bでは、両外縁136bが基準となり、外縁131b2の直線の長さと、外縁131b3の直線の長さとが比較されるため、両者の長さの差が消費者に容易に認識される。すなわち、外縁131b2と外縁131b3とが非対称な形状であり、結果として弓形形状の外縁131b1が非対称の位置にあると消費者に容易に認識される。このような非対称な吸収体103bを表面シート越しに見た消費者は、吸収性能に問題が無くても、この吸収性物品を不良品と認識すると考えられる。
ここで、図12(a)の左側の部分のように、切断位置57aと外縁56の位置とがほぼ重なる場合、図12(b)に示すように製造された吸収体3aは、長方形の長手方向の両端縁に凹曲線-凸曲線-凹曲線がこの順で並んだ形状を有する(図3)。すなわち、吸収体3aにおける長手方向に沿う互いに平行な直線状の二本の外縁36a、36aと、概ね幅方向に沿う凹-凸-凹の曲線状の外縁31aとで囲まれた形状を有する。この形状は外縁31aの頂部TP2を通る長手方向中心線Cxに対して線対称である。
そして図12(a)の右側の部分のように、切断位置57bと外縁56の位置とがずれた場合でも、図12(c)に示すように製造された吸収体3bは、吸収体3bの外縁31bは、凹-凸-凹のように幅方向(搬送方向)に沿って連続的に並んだ形状となる。ここで、吸収体3bの外縁31bでは、凸曲線の頂部TP2が目立ってしまい吸収体3bの幅方向の中心と認識されるとも考え得る。しかし、実際には凹-凸-凹の連続的な形状を見た消費者は、それを連続的なパターンの一部のように認識し、中心という概念を意識しない。それゆえ、吸収体3bの外縁31bにおいて、幅方向の中心がどこにあるかについて意識しなくなる。言い換えると、吸収体3bの外縁31bにおいて、凸湾曲領域32と凹湾曲領域33a、33bの視覚的効果により、吸収体3bの幅方向(搬送方向)の中心を消費者に印象付けないようにできる。それにより、搬送方向の切断の位置がずれ、凸湾曲領域32の頂部TP2が吸収体の搬送方向(幅方向)の中心に位置せず、吸収体3bの長手方向中心線Cxに対して線対称でなくても、その位置ずれを消費者に認識し難くすることができる。それにより、消費者が吸収体を不良と考え難くでき、吸収性物品の良品感を損なわないようにできる。
50 吸収体連続体
50b 端延部
52 凸湾曲領域
53 凹湾曲領域
Claims (14)
- 吸収性物品用の吸収体の製造方法であって、
前記吸収体の材料が帯状に延在する吸収体連続体を準備する準備工程と、
前記吸収体連続体を、搬送方向に搬送しつつ、前記搬送方向に直交する横断方向の寸法よりも前記搬送方向の寸法が短い吸収体を形成するように、前記横断方向に沿って切断する切断工程と、を備え、
前記吸収体連続体の前記横断方向の端延部は、
前記横断方向の外側に対して凸に湾曲した外縁を有する凸湾曲領域と、
前記横断方向の外側に対して凹に湾曲した外縁を有する凹湾曲領域と、
を有し、
前記凸湾曲領域と前記凹湾曲領域とが前記搬送方向に沿って交互に配置されており、
前記切断工程は、前記吸収体連続体を、前記凹湾曲領域において切断する工程を含む、
吸収体の製造方法。 - 前記凸湾曲領域の外形線は、凸状の曲線、又は、凸状の曲線及び直線から構成され、
前記凹湾曲領域の外形線は、凹状の曲線、又は、凹状の曲線及び直線から構成され、
前記凸湾曲領域の外形線及び前記凹湾曲領域の外形線の各々では、任意の点の接線と他の任意の点の接線とが交わる角度は、150度以上、210度以下である、
請求項1に記載の吸収体の製造方法。 - 前記凹湾曲領域の外形線は、前記吸収体連続体の前記横断方向の端縁よりも外側に中心を有する円の円弧、及び、前記吸収体連続体の前記横断方向の端縁よりも外側に焦点を有する楕円の弧、の少なくとも一方を含み、
前記凸湾曲領域の外形線は、前記吸収体連続体の前記横断方向の端縁よりも内側に中心を有する円の円弧、及び、前記吸収体連続体の前記横断方向の端縁よりも内側に焦点を有する楕円の弧、の少なくとも一方を含む、
請求項1又は2に記載の吸収体の製造方法。 - 前記吸収体連続体における前記凹湾曲領域の外形線の任意の点の曲率半径は、前記凸湾曲領域の外形線の任意の点の曲率半径よりも大きい、
請求項1乃至3のいずれか一項に記載の吸収体の製造方法。 - 前記凸湾曲領域の外形線及び前記凹湾曲領域の外形線の各々では、任意の点での曲率半径が、前記吸収体の前記搬送方向の寸法をAとして、A以上、3A以下である、
請求項1乃至4のいずれか一項に記載の吸収体の製造方法。 - 前記吸収体連続体の前記横断方向における最大寸法に対する最小寸法の比は、0.8~0.95である、
請求項1乃至5のいずれか一項に記載の吸収体の製造方法。 - 前記凸湾曲領域の外形線と前記凹湾曲領域の外形線との接合点を通り、前記搬送方向に平行な仮想線を基準として、凹湾曲領域の最も凹な位置と仮想線との前記横断方向の距離を凹寸法とし、凸湾曲領域の最も凸な位置と仮想線との前記横断方向の距離を凸寸法とすると、前記横断方向における前記凹寸法は前記凸寸法よりも小さい、
請求項1乃至6のいずれか一項に記載の吸収体の製造方法。 - 前記吸収体連続体の前記横断方向の端延部の外形線は正弦波又は複数の正弦波の合成波の形状を有する、
請求項1乃至7のいずれか一項に記載の吸収体の製造方法。 - 前記準備工程と前記切断工程との間に、前記吸収体連続体における前記吸収体となる領域ごとに所定の加工を行う加工工程を更に備える、
請求項1乃至8のいずれか一項に記載の吸収体の製造方法。 - 前記準備工程は、前記吸収体の材料である吸収体材料が前記搬送方向に帯状に延在する吸収体材料連続体を、前記横断方向の端延部が前記凹湾曲領域及び前記凸湾曲領域の形状を有するように切り出して、前記吸収体連続体を形成する形成工程を更に備える、
請求項1乃至9のいずれか一項に記載の吸収体の製造方法。 - 前記準備工程は、前記吸収体の材料である吸収体材料を、前記横断方向の端延部に前記凹湾曲領域及び前記凸湾曲領域に対応する形状を有するパターンプレートに積繊して前記吸収体連続体を形成する形成工程を更に備える、
請求項1乃至9のいずれか一項に記載の吸収体の製造方法。 - 請求項1乃至11のいずれか一項に記載の吸収体の製造方法を実行して吸収体を得る工程と、
前記吸収体に表面シート及び裏面シートを積層する積層合工程と、
前記切断工程で形成された前記吸収体における前記横断方向の端延部の外縁と、前記表面シート及び前記裏面シートの前記横断方向の端延部の外縁との距離が一定でないように、前記表面シート及び前記裏面シートを製品形状に切り出す切り出し工程と、を備える、
吸収性物品の製造方法。 - 前記積層工程は、
前記切断工程の直後に、前記吸収体に表面シートを積層する表面シート積層工程と、
前記表面シート積層工程の直後に、前記吸収体と前記表面シートとの積層体にエンボス加工を行うエンボス工程と、
を更に備える、
請求項12に記載の吸収性物品の製造方法。 - 前記吸収体の肌側には表面シートのみが存在する、
請求項12又は13に記載の吸収性物品の製造方法。
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