WO2020100736A1 - 連結式使い捨て着用物品、及びその製造におけるターゲットシートの貼付不良検出方法 - Google Patents
連結式使い捨て着用物品、及びその製造におけるターゲットシートの貼付不良検出方法 Download PDFInfo
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- WO2020100736A1 WO2020100736A1 PCT/JP2019/043854 JP2019043854W WO2020100736A1 WO 2020100736 A1 WO2020100736 A1 WO 2020100736A1 JP 2019043854 W JP2019043854 W JP 2019043854W WO 2020100736 A1 WO2020100736 A1 WO 2020100736A1
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- target sheet
- sheet
- target
- whiteness
- wearing article
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Images
Classifications
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Definitions
- the present invention relates to a connection-type disposable wearing article such as a tape-type disposable diaper and a target sheet sticking failure detection method in the production thereof.
- a general connection-type disposable wearing article has a crotch portion including a center in the front-rear direction, an abdominal portion extending forward from the center in the front-rear direction, and a back portion extending rearward from the center in the front-rear direction, and at least The back side portion has wing portions extending to the left and right sides in the width direction with respect to the crotch portion.
- the wing portion has a connecting portion that is detachably connected to the outer surface of the abdominal portion, and the outer surface of the abdominal portion has a sheet-shaped target sheet to which the connecting portion is connected. At the time of use, the wing portion is turned from both sides of the waist to the outer surface of the abdominal portion, and the connecting portion of the wing portion is connected to the target sheet.
- Such a connection-type disposable wearing article is used not only for infants but also for nursing care (adult) (see, for example, Patent Document 1).
- the most common method of detecting shapes and dimensions on a manufacturing line is to register a registration mark (register mark) on a target part (that is, a target sheet in this case), which is a mark that serves as an index for position detection, and is a rectangle, a line, or a combination thereof.
- a registration mark on a target part (that is, a target sheet in this case)
- a target part that is, a target sheet in this case
- a border is printed on a part or the whole of the peripheral edge including all the corners of the target sheet, and by using this border as a registration mark, the shape of the target sheet and the like can be confirmed. It is possible to detect and detect corner turning and the like based on the detection result.
- the main problem of the present invention is to facilitate the detection of the target sheet without the need for the registration mark.
- connection-type disposable wearing article and the method of manufacturing the same that solve the above problems are as follows.
- a crotch portion including the center in the front-rear direction, an abdominal portion extending forward from the center in the front-rear direction, and a back portion extending rearward from the center in the front-rear direction, On both sides of the back side portion, there is a connecting portion detachably connected to the outer surface of the abdominal side portion, On the outer surface of the abdominal portion, a target sheet to which the connecting portion is connected,
- At least one of the inner surface and the outer surface of the target sheet, the whiteness of all corners is 80% or more
- a connection-type disposable wearing article characterized by the above.
- the present inventor examined the following as a method for continuously detecting a target sheet on a production line. That is, the method is that after the target sheet is attached to the outer surface constituent member of the abdominal part, either the front surface or the back surface (for example, the opposite side of the target sheet) is irradiated with light and the opposite surface is also applied. It is intended to detect the target sheet by detecting the transmitted light that passes through the device with a light detecting device such as an image sensor and detecting the difference in light transmittance between the portion having the target sheet and the portion not having the target sheet. In other words, this method utilizes the fact that the light transmittance is lower than that of the surroundings because the part with high whiteness reflects light of all wavelengths. Most of disposable wearable articles have thin members and are often non-colored (white or milky white) and have light transmissivity. It was expected that the method would enable the detection of target sheets.
- the above disposable wear article was made based on such knowledge. That is, when the whiteness of all the corners on at least one of the inner surface and the outer surface of the target sheet is 80% or more, the surface having the whiteness is irradiated with light and the light is detected on the opposite surface. As a result, the light transmittance of all the corners of the target sheet is sufficiently reduced, the difference in the light transmittance between at least all the corners of the target sheet and the outside thereof is increased, and at least all the corners of the target sheet are increased. (That is, the minimum element for recognizing the size and shape of the target sheet) can be detected.
- the transmitted light is imaged by an image sensor that faces a portion including the target sheet
- at least all corners of the target sheet appear clearly blacker than the outer portion thereof. Can detect at least every corner of the. Then, depending on whether the target sheet recognized based on the detection result (for example, the corner detection result) is normal, the corner of the target sheet is curled, the sticking position is displaced, and the target sheet is manufactured on the production line. It is possible to detect a sticking defect such as a deviation in cutting dimension when cutting by.
- the influence of the wavelength of light is reduced, so the restrictions on the light source are lessened, and the influence of the color of members other than the target sheet is also reduced.
- the whiteness means “ISO whiteness (diffuse blue light reflectance)” defined in JIS P8148: 2001.
- the sample size is not limited as long as it can be measured by the measuring device.
- a whiteness measuring device for example, a spectrophotometer PF-10 type manufactured by Nippon Denshoku Industries Co., Ltd. can be used.
- the whiteness of a conventional general target sheet is less than 65%, and in such a case, the light intensity of the light source, the sensitivity of the photodetector such as an image sensor, the diaphragm, Even if the exposure is adjusted, the contrast is adjusted by the image processing of the image pickup result, or the contour line emphasis process is performed, the influence on the deterioration of the detection accuracy cannot be avoided.
- Patent Document 2 The one described in Patent Document 2 is common in that it adopts a transmission method, but the total light transmittance of the target sheet is as high as 60% (that is, the whiteness of the target sheet is low), and parts other than the target sheet It is expected that the detection of the target sheet will not be easy because the conditions and settings will become strict, etc.
- the connecting portion is a hook member of a mechanical fastener
- the target sheet is a non-woven fabric containing a white pigment, the constituent fibers having a fineness of 5 to 10 dtex, a basis weight of 20 to 40 g / m 2 , and a thickness of 0.3 to 0.8 mm.
- the connection-type disposable wearing article of the first aspect is a non-woven fabric containing a white pigment, the constituent fibers having a fineness of 5 to 10 dtex, a basis weight of 20 to 40 g / m 2 , and a thickness of 0.3 to 0.8 mm.
- a hook member of a mechanical fastener is used as the connecting portion of the connecting type disposable wearing article.
- a non-woven fabric as the target sheet because it gives a soft touch.
- the density can be increased in order to increase the whiteness, but in that case, the hook material at the connecting portion may be difficult to be entangled.
- the display when a display that is seen through from the outer surface of the target sheet is printed on a portion that overlaps the inside of the target sheet, the display may be difficult to see through. Therefore, when a non-woven fabric is used as the target sheet, it is preferable that the fineness, the basis weight and the thickness are within the above ranges, and the lack of whiteness is compensated by adding an appropriate amount of a white pigment such as titanium oxide.
- ⁇ Third aspect> In the portion that overlaps the inside of the target sheet, a display that is seen through from the outer surface of the target sheet is printed, The whiteness of the target sheet is 80 to 90%, The connection-type disposable wearing article according to the first or second aspect.
- the whiteness of the target sheet is preferably within the above range.
- a target display such as a scale is printed on the target sheet, and a graphic display such as a pattern or a character is printed around the target sheet.
- a graphic display such as a pattern or a character is printed around the target sheet.
- the cost increases by printing on a plurality of members.
- printing of the target display and printing of the other display are performed without printing on the target sheet (inevitably, the target sheet has no registration mark). It is preferable to aggregate the print sheets so that the target display can be seen through from the outer surface of the target sheet, because the cost can be significantly reduced.
- ⁇ Fifth aspect> An absorber provided at a position including the crotch portion, A liquid-permeable topsheet arranged on the front side of the absorber, A liquid impermeable sheet disposed on the back side of the absorber, Arranged on the back side of the liquid-impermeable sheet, having an exterior nonwoven fabric exposed on the outer surface,
- the target sheet is attached to the outer surface of the exterior nonwoven fabric, Of the inner surface and the outer surface, the exterior nonwoven fabric and the liquid impermeable sheet have a whiteness of 90% or less on the same side as the surface having a whiteness of 80% or more of the target sheet, respectively.
- the connection-type disposable wearing article according to any one of the first to fourth aspects.
- the whiteness of the exterior nonwoven fabric and the liquid impermeable sheet be within the above range.
- the target sheet is simply attached to the outer surface of the exterior nonwoven fabric (that is, only these two members), or the liquid impermeable sheet is attached to the inner surface of the exterior nonwoven fabric, and the target sheet is attached to the outer surface.
- the amount of transmitted light is less likely to be insufficient, and the target sheet can be detected with higher accuracy by the above-described transmitted light detection method.
- connection-type disposable wearing article In manufacturing the connection-type disposable wearing article according to any one of the first to fifth aspects, After the target sheet is attached to the outer surface constituent member of the ventral side portion, the target sheet is irradiated with light from the side having a surface having a whiteness of 80% or more, and transmitted light transmitted to the opposite surface is transmitted. Detected, based on the difference in light transmittance between the portion having the target sheet and the portion not having the target sheet, to detect at least all the corners of the target sheet, the target sheet recognized based on this detection result is normal. Detects the sticking failure of the target sheet depending on whether there is, A method for detecting defective sticking of a target sheet in the production of a connection-type disposable wearing article, comprising:
- ⁇ Seventh mode> The transmitted light is imaged by an image sensor facing the opposite surface to obtain a grayscale image, By recognizing an image of a part having a predetermined gradation or less in the imaging result, at least all the corners of the target sheet are detected, A sixth aspect of the method for detecting a sticking defect of a target sheet in the production of a concatenated disposable wearing article.
- ⁇ Eighth aspect> After sticking a surface having a whiteness of 80% or more of the target sheet to the outer surface constituent member of the abdominal part, the surface on the target sheet side is irradiated with light on the surface opposite to the target sheet side. To detect the transmitted light that passes through the The sticking defect detection method of the target sheet in manufacture of the connection-type disposable wearing article of the 6th or 7th aspect.
- the arrangement of the light source and the image sensor is preferably such that the outline of the target sheet is less likely to be blurred.
- FIG. 6 is a sectional view taken along line 6-6 of FIG. 1.
- FIG. 7 is a sectional view taken along line 7-7 of FIG. 1.
- FIG. 8A is a sectional view taken along line 8-8 of FIG. 1
- FIG. 9B is a sectional view taken along line 9-9 of FIG.
- FIG. 5 is a sectional view taken along line 5-5 of FIG. 1.
- the dotted pattern shows the hot melt adhesive as a joining means for joining the respective constituent members located on the front side and the back side thereof.
- the hot melt adhesive is prepared by a known method such as slot coating, continuous linear or dotted linear bead coating, spiral or Z-shaped spray coating, or pattern coating (transfer of hot melt adhesive by letterpress method). It can be applied. Alternatively or in addition to this, in the fixing portion of the elastic member, the hot melt adhesive can be applied to the outer peripheral surface of the elastic member to fix the elastic member to the adjacent member.
- hot melt adhesive there are, for example, EVA type, adhesive rubber type (elastomer type), olefin type, polyester / polyamide type, etc., but they can be used without particular limitation.
- a joining means for joining the respective constituent members it is possible to use means such as heat sealing or ultrasonic sealing by means of material welding.
- This tape-type disposable diaper has a crotch portion M including the center in the front-rear direction LD, an abdominal portion F extending forward from the center in the front-rear direction LD, and a back portion B extending rearward from the center in the front-rear direction LD.
- this tape-type disposable diaper is configured such that the absorbent body 56 contained in the range including the crotch portion, the liquid-permeable topsheet 30 arranged on the front side of the absorbent body 56, and the liquid impervious material covering the back side of the absorbent body 56. It has a permeable sheet 11 and an exterior nonwoven fabric 12 which covers the back side of the liquid impermeable sheet and constitutes the outer surface of the product.
- the absorber 56 is a portion that absorbs and retains the excreted liquid, and can be formed of a fiber aggregate.
- This fiber assembly is obtained by stacking short fibers such as cotton-like pulp and synthetic fibers, and filament aggregates obtained by opening tows (fiber bundles) of synthetic fibers such as cellulose acetate as needed. Can also be used.
- the fiber basis weight may be, for example, about 100 to 300 g / m 2 when laminating cotton-like pulp or short fibers, and about 30 to 120 g / m 2 for a filament aggregate.
- the fineness of synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex.
- the filament may be non-crimped fiber, but is preferably crimped fiber.
- the crimp degree of the crimped fiber can be, for example, about 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per 2.54 cm.
- crimped fibers that have been uniformly crimped can be used.
- the absorber 56 may contain superabsorbent polymer particles in a part or all thereof.
- Superabsorbent polymer particles include "powder” in addition to “particles”.
- the superabsorbent polymer particles those used in this type of absorbent article can be used as they are.
- the particle size of the superabsorbent polymer particles is not particularly limited, but for example, sieving (shaking for 5 minutes) using a 500 ⁇ m standard sieve (JIS Z8801-1: 2006), and particles falling under the sieve in this sieving
- sieving shaking for 5 minutes
- 180 ⁇ m standard sieve JIS Z8801-1: 2006
- the proportion of particles remaining on the 500 ⁇ m standard sieve is 30% by weight or less
- a 180 ⁇ m standard sieve It is desirable that the proportion of particles remaining on the surface is 60% by weight or more.
- the super absorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are preferable.
- superabsorbent polymer particles there are starch-based, cellulose-based, and synthetic polymer-based particles. Starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinking. And acrylic acid (salt) polymers can be used.
- the shape of the superabsorbent polymer particles is preferably a powder or granular material which is usually used, but other shapes can also be used.
- the super absorbent polymer particles those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption speed is too slow, the so-called backflow in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.
- the superabsorbent polymer particles those having a gel strength of 1000 Pa or more are preferably used. Accordingly, even when the absorbent body 56 is bulky, the sticky feeling after absorbing the liquid can be effectively suppressed.
- the basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be generally stated, it can be usually 50 to 350 g / m 2 .
- the absorbent body 56 can be incorporated as an absorbent element 50 wrapped with a packaging sheet 58.
- tissue paper particularly crepe paper, non-woven fabric, poly-laminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the sheet does not allow the superabsorbent polymer particles to escape.
- a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene or the like can be used as the material thereof.
- the fiber areal weight is preferably 5 to 40 g / m 2 , and particularly preferably 10 to 30 g / m 2 .
- the wrapping sheet 58 has a structure in which one sheet wraps the entire absorbent body 56, or a plurality of sheets such as upper and lower two sheets may wrap the entire absorbent body 56. 58 can be omitted.
- the top sheet 30 is liquid-permeable, and for example, a perforated or non-perforated nonwoven fabric, a porous plastic sheet, or the like can be used.
- the top sheet 30 extends from the front end to the rear end of the product in the front-rear direction and extends laterally of the absorber 56 in the width direction WD.
- the starting point of the rising gathers 60 described below is greater than the side edge of the absorber 56.
- the width of the top sheet 30 may be made shorter than the entire width of the absorber 56, and appropriate modifications may be made.
- An intermediate sheet (also referred to as a “second sheet”) 40 can be provided on the back side of the top sheet 30 in order to prevent the liquid that has passed through the top sheet 30 from returning.
- the intermediate sheet 40 can be omitted.
- the intermediate sheet 40 various non-woven fabrics can be preferably used, and particularly bulky air-through non-woven fabric can be preferably used. It is preferable to use a composite fiber having a core-sheath structure for the air-through nonwoven fabric.
- the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable.
- Basis weight is preferably 17 ⁇ 80g / m 2, more preferably 25 ⁇ 60g / m 2.
- the thickness of the raw material fibers of the non-woven fabric is preferably 2.0 to 10 dtex.
- eccentric fibers having no core at the center, hollow fibers, or eccentric and hollow fibers as the mixed fibers of all or part of the raw material fibers.
- the intermediate sheet 40 in the illustrated example is arranged in the center shorter than the width of the absorber 56, but may be provided over the entire width. Further, the intermediate sheet 40 may be provided over the entire length of the diaper, but may be provided only at the intermediate portion including the excretion position as in the illustrated example.
- the liquid impermeable sheet 11 is not particularly limited, but preferably has moisture permeability.
- the liquid impermeable sheet 11 is, for example, a microporous material obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet uniaxially or biaxially.
- a sheet can be used suitably.
- the liquid impermeable sheet 11 it is possible to use a sheet made of a non-woven fabric as a base material and having enhanced waterproofness.
- the liquid-impermeable sheet 11 preferably extends in the front-rear direction LD and the width direction WD in the same or wider range as the absorber 56, but if necessary, such as when other water-blocking means is present, It is also possible to adopt a structure in which the ends of the absorber 56 are not covered in the front-rear direction LD and the width direction WD.
- the exterior nonwoven fabric 12 covers the entire back side of the liquid impermeable sheet 11 and makes the outer surface of the product look like a cloth.
- the non-woven fabric may be used as a single sheet or may be used by stacking a plurality of sheets. In the latter case, it is preferable to bond the non-woven fabrics to each other with a hot melt adhesive or the like.
- the constituent fibers have a fineness of 1.6 to 2.3 dtex, a basis weight of 15 to 25 g / m 2 , and a thickness of 0.3 to 0.8 mm.
- rising gathers 60 that stand up on the wearer's skin side are provided on both sides in the width direction WD of the surface. Is preferable. Of course, the rising gather 60 can be omitted.
- the riser gather 60 in the illustrated example includes a gather sheet 62 that is substantially continuous in the width direction WD, and an elongated gather elastic member 63 that is fixed to the gather sheet 62 in an elongated state along the front-rear direction LD. ing.
- a water repellent non-woven fabric can be used as the gather sheet 62, and a thread rubber or the like can be used as the gather elastic member 63.
- a plurality of elastic members may be provided, or one elastic member may be provided.
- the inner surface of the gather sheet 62 has a joining start end in the width direction WD on the side portion of the top sheet 30, and the portion outside the joining start end in the width direction is the inner surface of each side flap portion SF, that is, liquid impermeable in the illustrated example. It is joined to the side portion of the elastic sheet 11 and the side portion of the exterior nonwoven fabric 12 located on the outer side in the width direction by a hot melt adhesive or the like.
- the inner side in the width direction from the joining start end of the rising gathers 60 is fixed on the top sheet 30 at both ends in the product front-rear direction, but the portion between them is a non-fixed free portion.
- the tape-type disposable diaper of the illustrated example has a pair of end flap portions EF that do not have the absorbent body 56 and that extend to the front side and the rear side of the absorbent body 56, and to the side of both side edges of the absorbent body 56. It has a pair of side flaps SF that do not have the absorber 56 and that respectively extend.
- the side flap portion SF may be made of a material (exterior nonwoven fabric 12 or the like) continuous from the portion having the absorber 56 as shown in the example, or may be formed by attaching another material.
- a side elastic member 64 made of an elongated elastic member such as a rubber thread is fixed to each side flap portion SF in a state of being extended along the front-rear direction LD, whereby a leg-surrounding portion of each side flap portion SF. Is configured as a flat gather.
- the side elastic member 64 is provided between the gather sheet 62 and the liquid impermeable sheet 11 on the outer side in the width direction near the joining start end in the joining portion of the gather sheet 62 as in the illustrated example, and the side flap portion SF. It can also be provided between the liquid impermeable sheet 11 and the exterior nonwoven fabric 12.
- a plurality of side elastic members 64 may be provided on each side as illustrated, or only one side elastic member 64 may be provided on each side.
- the flat gather is a portion where the contracting force of the side elastic member 64 acts (the portion where the side elastic member 64 is shown in the figure). Therefore, in addition to the form in which the side elastic member 64 exists only in the area of the flat gather, the side elastic member 64 exists in the front side, the rear side, or both sides of the flat gather, but the side elastic member does not exist in the area of the flat gather.
- the member is finely cut at one place or a large number of places, or is not fixed to the sheet sandwiching the side elastic member 64, or both, so that the contracting force acts on a site other than the flat gather. Not including (substantially equivalent to not providing the elastic member), a structure in which the contracting force of the side elastic member 64 acts only on the portion of the flat gather is also included.
- the back side portion B has a wing portion WP extending outside the crotch portion M in the width direction WD.
- the abdominal portion F also has a wing portion WP extending outward in the width direction WD with respect to the crotch portion M.
- These wing parts WP may be formed by members different from the other parts.
- the side flap portion SF as in the illustrated example, by cutting the middle of the side flap portion SF in the front-rear direction LD, a concave shape from the side edge of the crotch portion M to the lower edge 71 of the wing portion is formed. It is preferable that the rim 70 is formed and, as a result, the wing portion WP is formed because it is easy to manufacture.
- the wing portion WP of the back side portion B is provided with a connecting tape 80 detachably connected to the outer surface of the abdominal side portion F, respectively.
- the connecting tape 80 can be turned from both sides of the waist to the outer surface of the abdominal portion F to connect the connecting portion 83 of the connecting tape 80 to the appropriate position on the outer surface of the abdominal portion F.
- the connecting tape 80 includes a base portion 81 fixed to the wing portion WP, a sheet base material 80S forming a main body portion 82 extending from the base end portion 81, and the sheet base material 80S. And a connecting portion 83 for the abdominal portion F, which is provided in the middle portion of the main body portion 82 in the width direction WD.
- the base end 81 side of the connecting portion 83 is a non-connecting portion 84 that is not connected to the abdominal portion F, and the opposite side is a gripping portion 85.
- the non-connecting portion 84 and the picking portion 85 are composed only of the sheet base material 80S forming the main body portion 82.
- a hook material male material of a mechanical fastener (face fastener) may be provided, or an adhesive layer may be provided.
- the hook material has a large number of engaging projections on its connecting surface, and the engaging projections have shapes of (A) L-shape, (B) J-shape, (C) mushroom-shape, (D).
- T-shapes There are T-shapes, (E) double J-shapes (s in which J-shapes are joined back to back), and the like, but any shape may be used.
- a non-woven fabric, a plastic film, a poly-laminated non-woven fabric, paper or a composite material of these can be used, but the fineness is 1.0 to 3.5 dtex.
- a spunbonded nonwoven fabric, an air-through nonwoven fabric, or a spunlaced nonwoven fabric having a basis weight of 60 to 100 g / m 2 and a thickness of 1 mm or less is preferable.
- connecting portion 83 in the illustrated example is provided on the sheet base material 80S of the connecting tape 80 protruding from the wing portion WP, it may be directly provided on the wing portion WP.
- the target sheet 20 is provided at the connecting portion of the connecting tape 80 in the abdominal portion F.
- the target sheet 20 may have any shape such as a rectangular shape as shown in the figure.
- a sheet material for facilitating the connection can be attached to the outer surface of the abdominal portion F with a hot melt adhesive or the like.
- the sheet material for forming the target sheet 20 is not particularly limited, but when the connecting portion 83 is a hook material, for example, long fibers partially welded to each other by ultrasonic welding in an intermittent pattern.
- Nonwoven fabric can be used.
- the long fiber non-woven fabric is preferably a non-woven fabric having a fineness of constituent fibers of 5 to 10 dtex, a basis weight of 20 to 40 g / m 2 , and a thickness of 0.3 to 0.8 mm.
- a laminated nonwoven fabric in which the same or different types of nonwoven fabric layers are laminated can be used. In this case, it is preferable that the fineness, basis weight, and thickness are also within the above ranges.
- the connecting portion 83 is a hook material
- the sheet material 20S for forming the target sheet 20 as shown in FIG. 7, a loop thread with which the engaging protrusions of the hook material are entangled is made of a plastic film or a non-woven fabric. It is also possible to use a large number provided on the surface of the base material.
- the illustrated example is a composite sheet material 20S in which a loop pile fiber thread 26 is sewn on at least the outer surface of the base material 25, and the loop pile fiber thread 26 is provided on the outer surface of the base material 25, that is, on the outer surface side of the disposable diaper.
- the loop pile fiber yarns 26 are combined with each other on the back side (wearer side) of the base material 25, and the intersection row 27 of the loop pile fiber yarns 26 is formed. It is a thing.
- the connecting portion 83 is an adhesive material layer
- a release treatment is applied to the surface of a sheet material made of a plastic film having a smooth surface with high adhesiveness.
- a sheet material made of a plastic film having a smooth surface with high adhesiveness One can be used.
- the position of the target sheet 20 can be continuously detected on the production line by the following method.
- the target sheet 20 is attached to the outer surface constituent member (the exterior nonwoven fabric 12 in the illustrated example) of the ventral side portion F, the side having the surface with the whiteness of 80% or more of the target sheet 20.
- the light from the light source 91 is emitted from the light source 91 and the transmitted light transmitted to the opposite surface is detected by the light detection device such as the image sensor 92, and the difference in light transmittance between the portion having the target sheet 20 and the portion not having the target sheet 20 is detected. Based on this, at least all the corners of the target sheet 20 are detected, and the sticking failure of the target sheet 20 is detected depending on whether the target sheet 20 recognized based on the detection result is normal or not.
- the whiteness of all the corners 21 on at least one of the inner surface and the outer surface of the target sheet 20 is 80% or more, the light transmittance of all the corner portions 21 of the target sheet 20 is sufficiently lowered, Due to the large difference in light transmittance between at least all the corners of the target sheet 20 and the portion outside thereof, at least all the corners of the target sheet 20 (that is, the minimum size for recognizing the size and shape of the target sheet 20). Element) becomes easier to detect.
- This method utilizes the fact that the light transmittance is lower than that of the surroundings because the portion with high whiteness reflects light of all wavelengths.
- the target sheet 20 can be detected by such a transmitted light detection method.
- the influence of the wavelength of light is reduced, so that the restriction of the light source 91 is reduced, and the influence of the color of members other than the target sheet 20 is also reduced.
- the transmitted light is imaged by the image sensor 92 that faces the portion including the target sheet 20, as shown in FIG. 10A
- at least all the corners 21 of the target sheet 20 are more than the outer portion thereof. Also appears clearly black, and at least all the corners of the target sheet 20 can be detected by recognizing the black portion as an image. Then, depending on whether or not the target sheet 20 recognized based on the detection result (for example, the position of the corner) is normal, the corner 21 of the target sheet 20 is curled, the sticking position is displaced, and the target sheet 20 is detected. It is possible to detect a sticking defect such as a deviation of a cutting dimension when the product is cut on a manufacturing line.
- the conventional general target sheet 20 having the whiteness of less than 65%, as shown in FIG. 10B, the difference in shade between the portion having the target sheet 20 and the other portion is small. It is small and difficult to detect by image recognition.
- the whiteness of the target sheet 20 is preferably 80 to 90%.
- a target display 22 such as a scale or a logo is printed on the target sheet 20
- a graphic display 23 such as a pattern or a character is printed around the target sheet 20.
- the cost increases by printing on a plurality of members.
- a sheet for example, the liquid impermeable sheet 11 in the illustrated example
- the printing sheet having a first portion that overlaps the inside of the target sheet 20 and a second portion that extends around the first portion is used as the printing sheet, and this one printing sheet is used as the target.
- the whiteness of the target sheet 20 is preferably 90% or less as described above.
- the target sheet 20 has no printing (that is, it is plain) as described above, as long as the whiteness of all the corners 21 of the target sheet 20 is 80% or more, it has printing. You may. In this case, the target sheet 20 does not have a registration mark, but the target sheet 20 may have a print that does not become a registration mark or can become a registration mark.
- the surface of the target sheet 20 having the corners 21 with a whiteness of 80% or more is not limited to the corners 21, but also the whiteness of a part of the edges continuous to the adjacent corners 21 and the entire peripheral edge. It is preferable that the whiteness is 80% or more because the edge 20e of the target sheet 20 can be detected as described later. Of course, the whiteness may be 80% or more on the entire surface of the target sheet 20 having the corners 21 having a whiteness of 80% or more.
- the surface of the target sheet 20 having the corners 21 with a whiteness of 80% or more may be either an inner surface or an outer surface, or may be both surfaces (many target sheets 20 such as nonwoven fabrics have an inner surface and an outer surface). Whiteness is about the same). At the time of detection, it suffices to irradiate light from the side of the target sheet 20 having a surface with a whiteness of 80% or more and detect the light on the opposite side. Further, upon detection, the positions of the light source 91 and the light detection device (the image sensor 92 in the illustrated example) are not limited. However, the surface of the target sheet 20 having a whiteness of 80% or more is the inner surface, and as shown in FIG.
- the inner surface of the target sheet 20 is used as the outer surface constituent member (exterior nonwoven fabric 12 in the illustrated example) of the abdominal portion F during manufacturing.
- the light of the light source 91 is applied to the surface opposite to the target sheet 20 side, and the transmitted light passing through the surface on the target sheet 20 side is detected by the photodetector (image sensor 92 in the illustrated example). This is preferable because the contour of the target sheet 20 can be detected more clearly.
- a hook member of a mechanical fastener is generally used as the connecting portion 83.
- a non-woven fabric is used as the target sheet 20 because the target sheet 20 has a soft touch.
- the density can be increased in order to increase the whiteness, but in that case, the hook material of the connecting portion 83 may not be easily entangled.
- the displays 22 and 23 that are seen through from the outer surface of the target sheet 20 are printed on the portion that overlaps the inside of the target sheet 20, the displays 22 and 23 become difficult to see through. There is a fear.
- the target sheet 20 a non-woven fabric having a fineness of constituent fibers of 5 to 10 dtex, a basis weight of 20 to 40 g / m 2 and a thickness of 0.3 to 0.8 mm is used. It is preferable to supplement by adding an appropriate amount of a white pigment. Even when the target sheet 20 is other than the non-woven fabric, the whiteness can be set within the above range by using a white pigment or the like. Further, the whiteness of the target sheet 20 may be set within the above range using a dye or ink without using a white pigment. Needless to say, when the whiteness of the material of the target sheet 20 is high, no pigment or dye may be used.
- the detection position of the target sheet 20 on the manufacturing line can be appropriately determined, but it is preferable for improving the detection accuracy that the number of members overlapping the target sheet 20 is small (that is, light is easily transmitted). Therefore, in the case of the disposable diaper of the illustrated example, detection of the target sheet 20 in the production line is performed by simply attaching the target sheet 20 to the outer surface of the exterior nonwoven fabric 12 that is an outer surface constituent member, as shown in FIG. 8A. (That is, only these two members). Although not shown, in the case of a disposable diaper having no exterior nonwoven fabric 12, the target sheet 20 is detected on the production line only by attaching the target sheet 20 to the outer surface of the liquid impermeable sheet 11 which is the outer surface constituent member.
- the shape and size of the target sheet can be detected, but the deviation of the sticking position of the target sheet cannot be detected. That is, when detecting the deviation of the sticking position of the target sheet 20, a registration mark serving as a position reference is required in addition to the target sheet 20.
- the registration mark is applied to a member inside the outer surface constituent member, the target sheet 20 and the registration mark are detected in a state where the inner member, the outer surface constituent member, and the target sheet 20 are laminated. There is a need to.
- a registration mark is provided on a member inside the outer surface constituent member, for example, the liquid impermeable sheet 11, so that the inner surface of the exterior nonwoven fabric 12 is impermeable to liquid as shown in FIG. 8B.
- the target sheet 20 and the registration mark are detected, and recognition is performed based on these detection results.
- the positional relationship between the target sheet 20 and the registration mark that are formed makes it possible to detect the deviation of the sticking position of the target sheet 20. As shown in FIG.
- the target sheet 20 when the target sheet 20 is attached after the liquid impermeable sheet 11 is attached to the inner surface of the exterior nonwoven fabric 12, the target sheet 20 is attached on the downstream side of the attachment position.
- the shape and size of the target sheet 20 and the deviation of the sticking position of the target sheet 20 may be detected once.
- FIG. 9B the example shown in FIG. 8A is modified to detect the target sheet 20 on the downstream side of the attachment position of the liquid impermeable sheet 11 without performing detection in two steps. By performing the above, the shape and size of the target sheet 20 and the deviation of the sticking position of the target sheet 20 may be detected once.
- the exterior nonwoven fabric 12 preferably has a whiteness of 90% or less on the inner surface and the outer surface on the same side as the surface of the target sheet 20 having a whiteness of 80% or more.
- the liquid impermeable sheet 11 preferably has an inner surface and an outer surface having a whiteness of 90% or less on the same side as the surface of the target sheet 20 having a whiteness of 80% or more.
- a white arrow in FIG. 8 indicates a hot melt adhesive coating device for bonding the exterior nonwoven fabric 12 and the target sheet 20, and a hot melt adhesive for bonding the exterior nonwoven fabric 12 and the liquid impermeable sheet 11. Each of the coating devices is shown.
- the target sheet 20 is supplied as the continuous strip 20T, cut by the slip cutter device 99, and then attached to the exterior nonwoven fabric 12 at predetermined intervals.
- the light source 91, the light detection device, and the method of detecting the sticking failure of the target sheet 20 based on the detection result are not particularly limited.
- the light source 91 can illuminate either one of the front and back surfaces of the laminate of the outer surface constituting member of the ventral side portion F and the target sheet 20, even if it directly faces the surface, it indirectly illuminates the surface. It may be one.
- the light source 91 may be any one that can be detected by a photodetector and emits light including part or all of light in the visible wavelength range (lower limit 360 to 400 nm, upper limit 760 to 830 nm).
- the photodetector is preferably, for example, an image sensor 92 that detects light on the surface opposite to the light source 91 in the stack of the outer surface constituent member of the ventral side portion F and the target sheet 20.
- the type of the image sensor 92 is not particularly limited, but as shown in FIG. 8, a full-color camera 92a equipped with an image pickup device such as a CCD or CMOS, and the image pickup result of this camera 92a is converted into a grayscale image.
- a controller 92b that performs image processing such as the above, detection of the edge 20e, and the like and defect detection based thereon can be used.
- the target sheet 20 can be detected by the following processing, for example. That is, the controller 92b converts the imaging result of the full-color camera 92a into a grayscale image.
- the monochrome camera 92a may be used without performing the conversion process from the color image to the grayscale image. If necessary, it is possible to perform contrast adjustment, contour line emphasis processing, contour line smoothing processing, etc. by image processing of a color image or a gray scale image.
- the target sheet 20 appears more clearly and black than the outer portion thereof, so that the controller 92b recognizes a portion of the grayscale image having a predetermined gradation level or lower, and thereby The entire edge 20e is detected.
- the detection target does not have to be the entire edge 20e of the target sheet 20, and defect detection is possible if at least all corners can be detected.
- image recognition using a grayscale image in this way, simpler and faster detection processing can be performed.
- whiteness of the target sheet 20 is used, even when a grayscale image is formed, a clearer difference is generated, which has an advantage that the detection accuracy is less affected. It goes without saying that the same detection method can be performed using another known image sensor 92.
- the edge 20e of the target sheet 20 may be detected with this gradation as a boundary. It can.
- the boundary value of the gradation can be appropriately determined according to the conditions such as the strength of the light source 91, the sensitivity and the gain of the camera 92a, and the difference in gradation between the part of the target sheet 20 and the other parts. It is desirable to install and adjust the light source 91 and the camera 92a so as to be 30 or more, and more preferably 35 or more.
- the controller 92b determines whether or not the target sheet 20 recognized based on the detected position, pitch, number, angle, etc. of the edge 20e is within a preset normal range, and the target sheet 20 It is possible to detect a sticking defect such as a curling of the corner portion 21 or a deviation of the cutting dimension when the target sheet 20 is cut on the manufacturing line. Further, as described above, when a registration mark serving as a reference of the position of the target sheet 20 is provided on a member inside the outer surface constituent member, the controller 92b in the same or another image sensor 92 is Not only the edge 20e of 20 but also the registration mark serving as a position reference is detected by image recognition. Accordingly, the controller 92b shifts the sticking position of the target sheet 20 due to the positional relationship between the target sheet 20 recognized based on the detected position, pitch, number, angle, etc. of the edge 20e and the detected registration mark. Can also be detected.
- the light source 91 and the light detection device may be arranged in a straight line in a direction substantially orthogonal to the laminated body of the outer surface constituent member and the target sheet 20, or one or both of them may be slightly inclined to make the light source 91 of the light source 91.
- Nonwoven fabric As the non-woven fabric in the above description, a known non-woven fabric can be appropriately used depending on the site or purpose.
- the constituent fibers of the non-woven fabric include, for example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters, polyamides (including single-component fibers and composite fibers such as core-sheath), and regenerated rayon and cupra. Fibers, natural fibers such as cotton, etc. can be selected without particular limitation, and these can also be mixed and used. In order to increase the flexibility of the nonwoven fabric, it is preferable that the constituent fibers are crimped fibers.
- Nonwoven fabrics are generally short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbonded nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bond (air-through) nonwoven fabrics, needle punches, depending on the fiber length, sheet forming method, fiber bonding method, and laminated structure.
- non-woven fabrics It is classified into non-woven fabrics, point-bonded non-woven fabrics, laminated non-woven fabrics (SMS non-woven fabrics having a melt blown layer sandwiched between spun bond layers, SMMS non-woven fabrics, etc.), and any of these non-woven fabrics can be used.
- SMS non-woven fabrics having a melt blown layer sandwiched between spun bond layers, SMMS non-woven fabrics, etc.
- ⁇ Effect confirmation test> Each target sheet shown in Table 1 was prepared, and a target sheet defect detection test was conducted on the same production line as shown in FIG. 8 (b). In the test, artificially create a situation in which a corner of the target sheet has a curl, a situation in which the cut size of the target sheet 20 is displaced, a situation in which the target sheet is pasted and a normal situation are artificially created to detect a defect. The acceptability was evaluated.
- XG-7500 controller 92b
- XG-C035 camera 92a
- CV-L6 camera lens
- the light source 91 to be combined with the image sensor 92 on the upstream side two white flat illuminations LF1F-B4-2D3 manufactured by IDEC Co., Ltd. were used.
- the image sensor 92 on the upstream side detects the curling of the corner 21 of the target sheet 20 and the deviation of the cut dimension of the target sheet 20.
- XG-7000 controller 92b
- XG-C035 camera 92a
- CV-L3 camera lens manufactured by Keyence Corporation
- the light source 91 to be combined with the image sensor 92 on the downstream side four white LED illuminations LF1B-ND4P-2THWW2 manufactured by IDEC Corporation were used.
- the image sensor 92 on the downstream side detects a shift in the attachment position of the target sheet 20.
- a spunbonded nonwoven fabric made of polypropylene fiber having a fineness of 2.0 dtex, a basis weight of 20 g / m 2 , and a thickness of 0.5 mm was used as the exterior nonwoven fabric 12.
- This spunbonded nonwoven fabric contained titanium oxide and had a whiteness of 83.5% on both the outer surface and the inner surface.
- liquid impermeable sheet 11 a moisture permeable polyethylene film containing calcium carbonate particles was used.
- the liquid impermeable sheet 11 had a basis weight of 17 g / m 2 and a thickness of 20 ⁇ m, an outer surface whiteness of 78.2% and an inner surface whiteness of 83.7%.
- a sheet on which a registration mark serving as a reference of the position of the target sheet 20 is printed is used.
- the "deployed state” means a state in which it is flatly deployed without contraction or slack.
- -"Expansion rate means the value when the natural length is 100%.
- an extension rate of 200% is synonymous with an extension rate of 2 times.
- Basis weight is measured as follows. After the sample or test piece is pre-dried, the sample or test piece is left in a test room or a device in a standard state (test place is temperature 23 ⁇ 1 ° C., relative humidity 50 ⁇ 2%) to be in a constant weight state. Pre-drying refers to making a sample or a test piece a constant weight in an environment of a temperature of 100 ° C. It should be noted that the fiber having the official moisture regain of 0.0% does not need to be pre-dried. Using a template (100 mm ⁇ 100 mm) for sampling, a sample having a size of 100 mm ⁇ 100 mm is cut out from the test piece in a constant weight state. The weight of the sample is measured and multiplied by 100 to calculate the weight per 1 square meter, which is used as the basis weight.
- Water absorption rate is the "time to the end point" when JIS K7224-1996 "Water absorption rate test method of super absorbent polymer” is performed using 2 g of super absorbent polymer and 50 g of physiological saline.
- test or measurement shall be performed in the test room or the equipment in the standard condition (test place is temperature 23 ⁇ 1 ° C, relative humidity 50 ⁇ 2%). To do.
- the dimensions of each part refer to the dimensions in the unfolded state, not in the natural length state.
- connection type disposable wearing article such as the tape type disposable diaper of the above example.
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Abstract
Description
<第1の態様>
前後方向の中央を含む股間部と、前後方向の中央より前側に延びる腹側部分と、前後方向の中央より後側に延びる背側部分とを有し、
前記背側部分の両側部に、前記腹側部分の外面に着脱可能に連結される連結部を有し、
前記腹側部分の外面に、前記連結部が連結されるターゲットシートを有している、
連結式使い捨て着用物品において、
前記ターゲットシートの内面及び外面の少なくとも一方における、すべての隅部の白色度が80%以上である、
ことを特徴とする連結式使い捨て着用物品。
本発明者は、製造ラインでターゲットシートの検出を連続的に行う方法として、次のようなものを検討した。すなわち、その方法というのは、腹側部分の外面構成部材にターゲットシートを貼り付けた後、その表裏いずれか一方(例えばターゲットシートと反対側)の面に光を照射するとともに、反対側の面に透過する透過光を画像センサ等の光検出装置で検出し、ターゲットシートを有する部分と有しない部分とにおける光透過率の差により、ターゲットシートを検出しようとするものであった。つまり、この手法は、白色度の高い部分はあらゆる波長の光を反射する部分であるため、光透過率が周囲よりも低下することを利用するものである。使い捨て着用物品は、その部材のほとんどが薄く、非着色(白色又は乳白色)のものも多く、光の透過性を有するものであるため、反射光検出方式によらずとも、このような透過光検出方式によってターゲットシートの検出が可能になることが期待された。
前記連結部はメカニカルファスナーのフック材であり、
前記ターゲットシートは、構成繊維の繊度が5~10dtex、目付けが20~40g/m2、かつ厚みが0.3~0.8mmの、白色顔料を含有する不織布である、
第1の態様の連結式使い捨て着用物品。
連結式使い捨て着用物品の連結部としてはメカニカルファスナーのフック材が用いられることが一般的である。この場合、ターゲットシートとして不織布を用いると柔軟な肌触りとなるため好ましい。ターゲットシートが不織布である場合に白色度を上げるためには密度を高くすることもできるが、その場合、連結部のフック材が絡まりにくくなるおそれがある。また、後述するように、ターゲットシートの内側に重なる部分に、ターゲットシートの外面から透けて見える表示が印刷されている場合には、その表示が透けて見えにくくなるおそれもある。よって、ターゲットシートとして不織布を用いる場合には繊度、目付及び厚みを上記範囲内とし、白色度の不足を酸化チタン等の白色顔料を適量含有させることにより補うことが好ましい。
前記ターゲットシートの内側に重なる部分に、前記ターゲットシートの外面から透けて見える表示が印刷されており、
前記ターゲットシートの白色度が80~90%である、
第1又は2の態様の連結式使い捨て着用物品。
ターゲットシートの白色度が高すぎると、ターゲットシートの内側に重なる部分に、ターゲットシートの外面から透けて見える表示が印刷されている場合に、その表示が見えにくくなるおそれがある。よって、ターゲットシートの白色度は上記範囲内であると好ましい。
前記ターゲットシートの内側に重なる第1部分及びその周囲にわたる第2部分を有する印刷シートを備えており、
前記印刷シートにおける前記第1部分に、前記ターゲットシートの前記外面から透けて見えるターゲット表示が印刷されており、
前記印刷シートにおける前記第2部分に、前記ターゲット表示以外の表示が印刷されており、
前記ターゲットシートには、印刷が施されていない、
第3の態様の連結式使い捨て着用物品。
多くの連結式使い捨て着用物品では、目盛などのターゲット表示がターゲットシートに印刷されているとともに、ターゲットシートの周囲に模様やキャラクター等のグラフィック表示が印刷されている。この場合、複数の部材に印刷を行うことによりコストが嵩むことはいうまでもない。これに対して、上記のように、ターゲットシートには印刷を施さずに(必然的にターゲットシートにレジマークはないものとなる)、ターゲット表示の印刷及びそれ以外の表示の印刷を一枚の印刷シートに集約し、ターゲットシートの外面からターゲット表示が透けて見えるようにすると、著しいコスト削減となるため好ましい。
前記股間部を含む位置に設けられた吸収体と、
前記吸収体の表側に配された液透過性のトップシートと、
前記吸収体の裏側に配された液不透過性シートと、
前記液不透過性シートの裏側に配された、外面に露出する外装不織布とを有し、
前記ターゲットシートは前記外装不織布の外面に貼り付けられており、
前記外装不織布及び前記液不透過性シートは、内面及び外面のうち、ターゲットシートの白色度が80%以上の面と同じ側の面における白色度がそれぞれ90%以下である、
第1~4のいずれか1つの態様の連結式使い捨て着用物品。
本態様のような構造を有する使い捨て着用物品では、外装不織布及び液不透過性シートの白色度を上記範囲内とすることが好ましい。これにより、製造ラインで、外装不織布の外面にターゲットシートを取り付けただけの状態(つまりこれら2部材のみ)のとき、又は外装不織布の内面に液不透過性シートを貼り付け、かつ外面にターゲットシートを取り付けただけの状態(つまりこれら2部材のみ)のときに、透過光量が不足しにくくなり、前述の透過光検出方式によってターゲットシートの検出を、より高精度で行うことができるようになる。
第1~5のいずれか1つの態様の連結式使い捨て着用物品を製造するに際し、
前記腹側部分の外面構成部材に前記ターゲットシートを貼り付けた後、前記ターゲットシートの白色度が80%以上の面を有する側から光を照射するとともに、反対側の面に透過する透過光を検出し、前記ターゲットシートを有する部分と有しない部分とにおける光透過率の差に基づいて、前記ターゲットシートの少なくともすべての隅を検出し、この検出結果に基づいて認識されるターゲットシートが正常であるか否かに応じてターゲットシートの貼付不良を検出する、
ことを特徴とする連結式使い捨て着用物品の製造におけるターゲットシートの貼付不良検出方法。
引用する各態様と同様の作用効果を奏する。
前記反対側の面に臨む画像センサにより前記透過光を撮像し、グレースケール画像を取得し、
この撮像結果における所定階調以下の部分を画像認識することにより、前記ターゲットシートの少なくともすべての隅を検出する、
第6の態様の、連結式使い捨て着用物品の製造におけるターゲットシートの貼付不良検出方法。
このようにグレースケール画像を用いた画像認識を行うことにより、より簡素かつ高速な検出処理を行うことができる。また、ターゲットシートの白色度を利用するため、グレースケール画像にしたときでも、よりはっきりとした差を生じることとなり、検出精度への影響が少ないという利点も有する。
前記腹側部分の外面構成部材に、前記ターゲットシートの前記白色度が80%以上の面を貼り付けた後、ターゲットシート側と反対側の面に光を照射するとともに、前記ターゲットシート側の面に透過する透過光を検出する、
第6又は7の態様の、連結式使い捨て着用物品の製造におけるターゲットシートの貼付不良検出方法。
光源及び画像センサの配置は、本態様のようになっていると、ターゲットシートの輪郭がぼけにくいため好ましい。
(吸収体)
吸収体56は、排泄液を吸収し、保持する部分であり、繊維の集合体により形成することができる。この繊維集合体としては、綿状パルプや合成繊維等の短繊維を積繊したものの他、セルロースアセテート等の合成繊維のトウ(繊維束)を必要に応じて開繊して得られるフィラメント集合体も使用できる。繊維目付けとしては、綿状パルプや短繊維を積繊する場合は、例えば100~300g/m2程度とすることができ、フィラメント集合体の場合は、例えば30~120g/m2程度とすることができる。合成繊維の場合の繊度は、例えば、1~16dtex、好ましくは1~10dtex、さらに好ましくは1~5dtexである。フィラメント集合体の場合、フィラメントは、非捲縮繊維であってもよいが、捲縮繊維であるのが好ましい。捲縮繊維の捲縮度は、例えば、2.54cm当たり5~75個、好ましくは10~50個、さらに好ましくは15~50個程度とすることができる。また、均一に捲縮した捲縮繊維を用いることができる。
吸収体56には、その一部又は全部に高吸収性ポリマー粒子を含有させることができる。高吸収性ポリマー粒子とは、「粒子」以外に「粉体」も含む。高吸収性ポリマー粒子としては、この種の吸収性物品に使用されるものをそのまま使用できる。高吸収性ポリマー粒子の粒径は特に限定されないが、例えば500μmの標準ふるい(JIS Z8801-1:2006)を用いたふるい分け(5分間の振とう)、及びこのふるい分けでふるい下に落下する粒子について180μmの標準ふるい(JIS Z8801-1:2006)を用いたふるい分け(5分間の振とう)を行ったときに、500μmの標準ふるい上に残る粒子の割合が30重量%以下で、180μmの標準ふるい上に残る粒子の割合が60重量%以上のものが望ましい。
高吸収性ポリマー粒子の抜け出しを防止するため、あるいは吸収体56の形状維持性を高めるために、吸収体56は包装シート58で包んでなる吸収要素50として内蔵させることができる。包装シート58としては、ティッシュペーパ、特にクレープ紙、不織布、ポリラミ不織布、小孔が開いたシート等を用いることができる。ただし、高吸収性ポリマー粒子が抜け出ないシートであるのが望ましい。クレープ紙に換えて不織布を使用する場合、親水性のSMMS(スパンボンド/メルトブローン/メルトブローン/スパンボンド)不織布が特に好適であり、その材質はポリプロピレン、ポリエチレン/ポリプロピレンなどを使用できる。繊維目付けは、5~40g/m2、特に10~30g/m2のものが望ましい。
トップシート30は液透過性を有するものであり、例えば、有孔又は無孔の不織布や、多孔性プラスチックシートなどを用いることができる。
トップシート30を透過した液の逆戻りを防止するために、トップシート30の裏側に中間シート(「セカンドシート」とも呼ばれている)40を設けることができる。中間シート40は省略することもできる。
液不透過性シート11は、特に限定されるものではないが、透湿性を有するもが好ましい。液不透過性シート11としては、例えば、ポリエチレンやポリプロピレン等のオレフィン系樹脂中に無機充填剤を混練して、シートを成形した後、一軸又は二軸方向に延伸して得られた微多孔性シートを好適に用いることができる。また、液不透過性シート11としては、不織布を基材として防水性を高めたものも用いることができる。
外装不織布12は液不透過性シート11の裏側全体を覆い、製品外面を布のような外観とするものである。不織布は一枚で使用する他、複数枚重ねて使用することもできる。後者の場合、不織布相互をホットメルト接着剤等により接着するのが好ましい。不織布を用いる場合、その構成繊維の繊度が1.6~2.3dtex、目付けが15~25g/m2、かつ厚みが0.3~0.8mmの不織布であると好ましい。
トップシート30上を伝わって横方向に移動する排泄物を阻止し、いわゆる横漏れを防止するために、表面の幅方向WDの両側には、装着者の肌側に立ち上がる起き上がりギャザー60が設けられていると好ましい。もちろん、起き上がりギャザー60は省略することもできる。
図示例のテープタイプ使い捨ておむつは、吸収体56の前側及び後側にそれぞれ延出する、吸収体56を有しない一対のエンドフラップ部EFと、吸収体56の両方の側縁よりも側方にそれぞれ延出する、吸収体56を有しない一対のサイドフラップ部SFとを有している。サイドフラップ部SFは、図示例のように、吸収体56を有する部分から連続する素材(外装不織布12等)からなるものであっても、他の素材を取り付けて形成してもよい。
各サイドフラップ部SFには、糸ゴム等の細長状弾性部材からなるサイド弾性部材64が前後方向LDに沿って伸長された状態で固定されており、これにより各サイドフラップ部SFの脚周り部分が平面ギャザーとして構成されている。サイド弾性部材64は、図示例のように、ギャザーシート62の接合部分のうち接合始端近傍の幅方向外側において、ギャザーシート62と液不透過性シート11との間に設けるほか、サイドフラップ部SFにおける液不透過性シート11と外装不織布12との間に設けることもできる。サイド弾性部材64は、図示例のように各側で複数本設ける他、各側に1本のみ設けることもできる。
本テープタイプ使い捨ておむつでは、背側部分Bは股間部Mよりも幅方向WD外側に延び出たウイング部分WPを有している。同様に、腹側部分Fも股間部Mよりも幅方向WD外側に延び出たウイング部分WPを有している。これらウイング部分WPは、それ以外の部分と別の部材により形成することもできる。しかし、図示例のようにサイドフラップ部SFを有する構造において、サイドフラップ部SFの側部における前後方向LD中間を切断することにより、股間部Mの側縁からウイング部分の下縁71までの凹状縁70が形成され、その結果としてウイング部分WPが形成されていると、製造が容易であるため好ましい。
図1、図2及び図6に示すように、背側部分Bにおけるウイング部分WPには、腹側部分Fの外面に対して着脱可能に連結される連結テープ80がそれぞれ設けられている。おむつの装着に際しては、連結テープ80を腰の両側から腹側部分Fの外面に回して、連結テープ80の連結部83を腹側部分F外面の適所に連結することができる。
腹側部分Fにおける連結テープ80の連結箇所には、ターゲットシート20が設けられている。ターゲットシート20の形状は図示例のような矩形状等、任意の形状とすることができる。ターゲットシート20は、図示例のように、連結を容易にするためのシート材を腹側部分Fの外面に、ホットメルト接着剤等により貼り付けることができる。
ターゲットシート20の内面及び外面の少なくとも一方における、すべての隅部21の白色度が80%以上であると好ましい。このようなターゲットシート20を用いることにより、以下の方法で、製造ラインでターゲットシート20の位置検出を連続的に行うことができる。
上記説明における不織布としては、部位や目的に応じて公知の不織布を適宜使用することができる。不織布の構成繊維としては、例えばポリエチレン又はポリプロピレン等のオレフィン系、ポリエステル系、ポリアミド系等の合成繊維(単成分繊維の他、芯鞘等の複合繊維も含む)の他、レーヨンやキュプラ等の再生繊維、綿等の天然繊維等、特に限定なく選択することができ、これらを混合して用いることもできる。不織布の柔軟性を高めるために、構成繊維を捲縮繊維とするのは好ましい。また、不織布の構成繊維は、親水性繊維(親水化剤により親水性となった繊維を含む)であっても、疎水性繊維若しくは撥水性繊維(撥水剤により撥水性となった繊維を含む)であってもよい。また、不織布は一般に繊維の長さや、シート形成方法、繊維結合方法、積層構造により、短繊維不織布、長繊維不織布、スパンボンド不織布、メルトブローン不織布、スパンレース不織布、サーマルボンド(エアスルー)不織布、ニードルパンチ不織布、ポイントボンド不織布、積層不織布(スパンボンド層間にメルトブローン層を挟んだSMS不織布、SMMS不織布等)等に分類されるが、これらのどの不織布も用いることができる。
表1に示す各ターゲットシートを用意し、図8(b)に示すのと同様の製造ラインでターゲットシートの不良検出試験を行った。試験に際しては、ターゲットシートの隅部に捲れを有する状況、ターゲットシート20の切断寸法がずれた状況、ターゲットシートの貼付位置がずれた状況、及び正常な状況をそれぞれ人為的に作り出し、不良検出の可否を評価した。
明細書中の以下の用語は、明細書中に特に記載が無い限り、以下の意味を有するものである。
・「前後方向」とは図中に符号LDで示す方向(縦方向)を意味し、「幅方向」とは図中にWDで示す方向(左右方向)を意味し、前後方向と幅方向とは直交するものである。
Claims (8)
- 前後方向の中央を含む股間部と、前後方向の中央より前側に延びる腹側部分と、前後方向の中央より後側に延びる背側部分とを有し、
前記背側部分の両側部に、前記腹側部分の外面に着脱可能に連結される連結部を有し、
前記腹側部分の外面に、前記連結部が連結されるターゲットシートを有している、
連結式使い捨て着用物品において、
前記ターゲットシートの内面及び外面の少なくとも一方における、すべての隅部の白色度が80%以上である、
ことを特徴とする連結式使い捨て着用物品。 - 前記連結部はメカニカルファスナーのフック材であり、
前記ターゲットシートは、構成繊維の繊度が5~10dtex、目付けが20~40g/m2、かつ厚みが0.3~0.8mmの、白色顔料を含有する不織布である、
請求項1記載の連結式使い捨て着用物品。 - 前記ターゲットシートの内側に重なる部分に、前記ターゲットシートの外面から透けて見える表示が印刷されており、
前記ターゲットシートの白色度が80~90%である、
請求項1又は2記載の連結式使い捨て着用物品。 - 前記ターゲットシートの内側に重なる第1部分及びその周囲にわたる第2部分を有する印刷シートを備えており、
前記印刷シートにおける前記第1部分に、前記ターゲットシートの前記外面から透けて見えるターゲット表示が印刷されており、
前記印刷シートにおける前記第2部分に、前記ターゲット表示以外の表示が印刷されており、
前記ターゲットシートには、印刷が施されていない、
請求項3記載の連結式使い捨て着用物品。 - 前記股間部を含む位置に設けられた吸収体と、
前記吸収体の表側に配された液透過性のトップシートと、
前記吸収体の裏側に配された液不透過性シートと、
前記液不透過性シートの裏側に配された、外面に露出する外装不織布とを有し、
前記ターゲットシートは前記外装不織布の外面に貼り付けられており、
前記外装不織布及び前記液不透過性シートは、内面及び外面のうち、前記ターゲットシートの白色度が80%以上の面と同じ側の面における白色度がそれぞれ90%以下である、
請求項1~4のいずれか1項に記載の連結式使い捨て着用物品。 - 第1~5のいずれか1つの態様の連結式使い捨て着用物品を製造するに際し、
前記腹側部分の外面構成部材に前記ターゲットシートを貼り付けた後、前記ターゲットシートの白色度が80%以上の面を有する側から光を照射するとともに、反対側の面に透過する透過光を検出し、前記ターゲットシートを有する部分と有しない部分とにおける光透過率の差に基づいて、前記ターゲットシートの少なくともすべての隅を検出し、この検出結果に基づいて認識されるターゲットシートが正常であるか否かに応じてターゲットシートの貼付不良を検出する、
ことを特徴とする連結式使い捨て着用物品の製造におけるターゲットシートの貼付不良検出方法。 - 前記反対側の面に臨む画像センサにより前記透過光を撮像し、グレースケール画像を取得し、
この撮像結果における所定階調以下の部分を画像認識することにより、前記ターゲットシートの少なくともすべての隅を検出する、
請求項6記載の、連結式使い捨て着用物品の製造におけるターゲットシートの貼付不良検出方法。 - 前記腹側部分の外面構成部材に、前記ターゲットシートの前記白色度が80%以上の面を貼り付けた後、ターゲットシート側と反対側の面に光を照射するとともに、前記ターゲットシート側の面に透過する透過光を検出する、
請求項6又は7記載の、連結式使い捨て着用物品の製造におけるターゲットシートの貼付不良検出方法。
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