JP4397332B2 - Disposable diapers with patterned sheets - Google Patents

Description

  The present invention relates to a disposable diaper, and more particularly, to a disposable diaper having a pattern sheet in which a pattern of multicolor printing is visible only on the back or front of a diaper.

  In a so-called open-type disposable diaper for infants and infants or a disposable diaper previously formed into a pants-type, it is common that a pattern such as an animal or character figure appears on the exterior of the diaper.

  As a conventional method of attaching the pattern, a continuous pattern or a repeated pattern is printed in advance on a film that becomes a diaper exterior sheet (back sheet), and the diaper is continuously manufactured by an automatic machine using the exterior sheet. Is common.

Further, the one described in Patent Document 1 below uses a see-through exterior sheet (back sheet), and joins the exterior sheet and a third member inside the exterior sheet via a hot-melt adhesive having a color. ing. Then, the hot melt adhesive is applied in the form of dots, and with this hot melt adhesive, a high dot density region is formed, and the pattern and pattern are expressed in the high dot density region. Is visible through the exterior sheet.
Japanese Patent Laid-Open No. 3-90602

  In the method of manufacturing a diaper using a film having a pattern printed in advance as an exterior sheet as described above, an absorbent layer and a liquid-permeable inner surface sheet (top sheet) are stacked on the belt-shaped exterior sheet, and then The process involves separation into individual diapers. Therefore, in the completed disposable diaper, it is substantially impossible to control which pattern or pattern is located at which position of the diaper exterior. Therefore, the printing of the exterior sheet is limited to the continuous pattern and the repeated pattern as described above, and the degree of freedom in selecting the design of the pattern appearing on the exterior is limited. In addition, since it is necessary to print the entire film as the exterior sheet, the manufacturing cost of the exterior sheet (film having a printed pattern) increases. For example, if a pattern is expressed by multicolor printing, the cost is increased. Extremely high.

  Next, in the thing of the said patent document 1, since a colored hot-melt-type adhesive is applied to an exterior sheet using a roll coater, and a pattern is expressed by dot application of this hot-melt-type adhesive. A clear pattern cannot be obtained, and of course, it is impossible to express a multicolor pattern. Furthermore, in FIG. 1 of Patent Document 1, a pattern appears only in a part of the diaper. However, as described above, the position of the completed diaper and the pattern is likely to be shifted by the method of applying the pattern by the roll coater. There are drawbacks.

  The present invention solves the above-described conventional problems, enables a pattern to be applied to only a part of the diaper at a low cost, and prevents a significant increase in cost even when a pattern of multicolor printing is used. The purpose is to provide disposable disposable diapers.

  Another object of the present invention is to provide a disposable diaper that can minimize the positional deviation between the pattern and the diaper when the pattern is attached to a part of the diaper and can also freely cope with the change of the part to which the pattern is attached. It is said.

The present invention includes an exterior sheet facing outward, a liquid-permeable inner sheet facing the liquid receiving side, and an absorbent layer positioned between the exterior sheet and the inner sheet, In a disposable diaper formed with a front part applied to the side, an intermediate part applied to the crotch part, and a rear surface part applied to the back side,
A liquid-impervious sheet is superimposed on the inside of the exterior sheet, and a moisture-permeable pattern sheet on which a pattern is printed in multiple colors is provided between the exterior sheet and the liquid-impermeable sheet, The multicolor pattern can be seen through the exterior sheet, and the pattern sheet has an area of 50% or less of the area of the diaper when the disposable diaper is viewed from the back or the front. It is characterized by.

For example, the pattern sheet is bonded and fixed to the exterior sheet.
Further, according to the present invention, the pattern sheet is not applied to any of a waist gather formed in the waist opening, a leg gather provided in the leg opening, and a waistline gather formed from the front surface portion to the rear surface portion. It can comprise as what is attached.

  The disposable diaper of the present invention may be a so-called open type, or may be formed in a pants shape in advance.

  When the disposable diaper is viewed from the back, when viewed from the front, when the diaper is not attached to a human body, the diaper is crushed into a flat shape so that the front portion and the rear portion are in close contact with each other. It means the state seen from the back side or the front side. Alternatively, it means a three-dimensional shape in the same state as when a disposable diaper is worn on a human body, and means a projected shape when the diaper is viewed from the back side and from the front side. That is, it is only necessary to satisfy the condition that the area occupied by the pattern sheet is smaller than the area (projected area) of the diaper under any one of the state where the diaper is crushed and the state where the diaper is crushed.

  And the area which the said pattern sheet accounts is 50% or less with respect to the area of the diaper when it sees from the back, or the area of the diaper when it sees from the front.

  The pattern sheet is, for example, a polygon, a circle, or an ellipse.

As a pattern sheet, due to the use of sheets of air permeability and moisture permeability, the outer sheet is breathable, in the case of moisture permeability, it was stuck a pattern sheet, inhibits aeration and moisture permeation function of the outer sheet Absent.

  For example, the exterior sheet is a non-woven fabric, and a liquid-impermeable sheet or a hydrophobic sheet is stacked inside the exterior sheet, and the pattern sheet includes the exterior sheet and the liquid-impermeable sheet or the hydrophobic sheet. It is a thing stuck in between.

  The disposable diaper of this invention can attach | subject a pattern to arbitrary positions. Moreover, since a pattern sheet having a relatively small area is used, there is little waste of sheet material such as a resin film forming the pattern sheet. Further, since the pattern is printed on the pattern sheet having a small area, the cost of printing the pattern can be reduced. In addition, since the printing cost can be reduced as compared with the conventional case where a continuous pattern or a repeated pattern is printed on the entire exterior sheet, the pattern can be printed in multiple colors.

  In addition, a one-point or several-point pattern can be positioned and attached to the diaper with high accuracy, and pattern deviation hardly occurs.

  FIG. 1 is a perspective view showing a pants-type disposable diaper as one embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line II-II of the pants-type disposable diaper shown in FIG. 1, and FIGS. It is a perspective view which shows an example of the manufacturing method of a diaper.

  The disposable diaper 1 of the present invention shown in FIG. 1 is formed in a pants shape in advance, and has a so-called hourglass shape in the unfolded state before the molding. The diaper 1 has a front surface portion 2A applied to the wearer's abdomen during use, a rear surface portion 2C applied to the buttocks and / or back during use, and an intermediate portion 2B applied to the crotch portion during use.

  The lateral side portion 4A of the front surface portion 2A and the lateral side portion 4C of the rear surface portion 2C are joined to each other. As a result, a waist opening 5 is formed by the waist end 3A of the front surface 2A and the waist end 3C of the rear surface 2C. Further, leg openings 6 are formed on the left and right sides of the front surface portion 2A, the intermediate portion 2B, and the rear surface portion 2C.

  An elastic member (elastic band) 7 is attached to the waist ends 3A and 3C in the lateral direction, and a waist gather is formed along the waist opening 5 by the elastic contraction force of the elastic member 7 as shown in FIG. Is done. An elastic member (elastic band) 8 is attached around the leg opening 6, and a leg gather (leg side) is formed around the leg opening 6 by the elastic contraction force of the elastic member 8 as shown in FIG. Cuff) is formed.

  In the cross-sectional view of FIG. 2, the lower side is the outer surface side of the diaper 1, and the inner side is the inner surface side of the diaper 1. The laminated structure of the diaper includes a waterproof sheet 12 (liquid impermeable sheet) formed of a breathable and moisture permeable film inside an exterior sheet 11 formed of a nonwoven fabric which is a breathable and moisture permeable material. It is piled up. Further, an absorbent layer 13 is stacked on the inner side of the waterproof sheet 12, and a liquid-permeable inner sheet 14 is stacked on the innermost surface side. A square piece pattern sheet 15 is sandwiched between the exterior sheet 11 and the waterproof sheet 12.

  A hot melt adhesive 16a is applied to the inner surface of the exterior sheet 11 in a random shape such as a wave shape, and the exterior sheet 11 and the waterproof sheet 12 are bonded to each other by the hot melt adhesive 16a. The pattern sheet 15 is bonded and fixed to the exterior sheet 11 by the hot melt adhesive 16a.

  Also, hot melt adhesives 16b and 16c are randomly applied to the inner surface of the waterproof sheet 12 and the inner surface of the absorbent layer 13, and the waterproof sheet 12 and the absorbent layer 13 are adhered to each other. 14 is bonded.

  The exterior sheet 11, the inner sheet 14, and the waterproof sheet 12 are hourglass shapes having the same overall shape in a state where the diaper 1 is developed. However, only the waterproof sheet 12 may be smaller than the exterior sheet 11 and the inner sheet 14. The absorbent layer 13 has an hourglass shape that is slightly smaller than the outer sheet 11 and the inner sheet 14. The exterior sheet 11 and the inner sheet 14 (and the waterproof sheet 12) are positioned away from the periphery of the absorbent layer 13, that is, the lateral side 4A of the front surface 2A, the lateral side 4C of the rear surface 2C, Further, around the waist ends 3A and 3C and the periphery of the waist opening 5, they are bonded to each other by the hot melt adhesives 16a and 16b.

  On the other hand, the pattern sheet 15 occupies a sufficiently smaller area than the exterior sheet 11, and a pattern 17 such as an animal face, a character, or a plant, or a symbol, a character, or the like is printed on the outer surface thereof. Has been. In the illustrated embodiment, a one-point pattern 17 is printed on one pattern sheet 15. Further, any combination of the figure, symbol, and character may be printed as the pattern 17. Since the pattern sheet 15 is a small square piece, the area of the margin around the pattern 17 is small. Therefore, the pattern sheet 15 can be manufactured at low cost. Further, since the pattern sheet 15 is small and the size of the pattern 17 is small, a significant increase in cost can be suppressed even when the pattern 17 is printed in multiple colors.

The pattern sheet 15 is a resin film such as polyethylene or polypropylene, or a paper material, a laminate material of a paper material and a resin film, or the like, and can preferably print the pattern 17 vividly. When the pattern sheet 15 is formed of a resin film, a breathable and moisture permeable film is used, so that the breathability and moisture permeability at the portion where the pattern sheet 15 is attached are not hindered. Moreover, you may comprise the pattern sheet 15 by nonwoven fabrics, such as a point bond, a spun bond, and a spun lace. The pattern sheet 15 formed of this nonwoven fabric is breathable and moisture permeable.

  The exterior sheet 11 is a non-woven fabric and has a light transmittance that can be visually confirmed through the pattern 17, such as a point bond, an air-through, a spun bond, and a spun lace non-woven fabric.

  The waterproof sheet 12 is a breathable and moisture permeable resin film such as polyethylene or polypropylene. The absorbent layer 13 is formed of an absorbent material, for example, pulverized pulp or a mixture of pulverized pulp and a superabsorbent polymer, and the pulverized pulp or a mixture of pulverized pulp and a superabsorbent polymer is wrapped with an absorbent sheet such as tissue. It is rare.

  The inner surface sheet 14 is liquid permeable and is formed of a hydrophobic fiber, a hydrophilic fiber, or the like that has been subjected to a hydrophilic treatment, such as a point bond, an air through, a spun bond, or a spun lace nonwoven fabric. Alternatively, the inner sheet 14 may be formed by stacking a cushion layer made of a bulky nonwoven fabric on the nonwoven fabric.

  The pattern sheet 15 is attached to the rear surface portion 2C of the diaper 1 or is attached from the rear surface portion 2C to the intermediate portion 2B. In this case, when the disposable diaper 1 is viewed from the back (direction (i)) in the same three-dimensional state as shown in FIG. 1 when worn on the human body, or the disposable diaper 1 is connected to the front portion 2A. The pattern sheet 15 occupies a smaller area than the entire viewing area of the diaper when crushed to a flat state so as to be in close contact with the rear surface portion 2C and viewed from the back (direction (i)). Preferably, the area occupied by the pattern sheet 15 with respect to the entire viewing area is 50% or less.

  Moreover, the pattern sheet 15 may be attached to the front part 2A of the diaper 1 or may be attached from the front part 2A to the intermediate part 2B. In this case, the area occupied by the pattern sheet 15 with respect to the entire viewing area of the diaper when viewed from the front ((ii) direction) in the three-dimensional state of the diaper 1 or in a state where the diaper 1 is crushed. It is sufficiently small, and preferably the area ratio is 50% or less.

  Further, the pattern sheet 15 can be attached to both the front surface portion 2A side and the rear surface portion 2C side.

  The pattern sheet 15 can be attached at an arbitrary position, but is formed by the elastic member 8 around the waist opening 5 and the waist gathers formed by the elastic member 7 and the leg opening 6. It is preferable to attach to an area that does not reach both of the leg gathers. In addition, even in the case where a gather that is continuous from the front portion 2A to the rear portion 2C is formed around the trunk, it is preferable that the pattern sheet 15 is attached at a position that does not catch the gather.

  If the pattern sheet 15 is attached at a position where it does not hit the gathers, the pattern sheet 15 can be kept relatively flat, and the pattern 17 can be prevented from being distorted.

  Furthermore, it is preferable that the pattern sheet 15 is attached at a position that avoids a joint portion between the lateral side portion 4A of the front surface portion 2A and the lateral side portion 4C of the rear surface portion 2C. Joining of the side portion 4A and the side portion 4C is realized by thermal welding. However, if the pattern sheet 15 is present at the joining portion, the joining by the thermal welding is hindered.

  Next, the manufacturing method of the disposable diaper 1 of embodiment shown by the said FIG. 1 and FIG. 2 is demonstrated.

  After applying the hot melt adhesive 16a to the nonwoven fabric to be the exterior sheet 11, as shown in FIG. 5, the pattern sheet 15 on which the pattern 17 has been printed in advance is positioned so as to have a predetermined interval, and the nonwoven fabric is placed on the nonwoven fabric. Install in. The pattern sheet 15 is cut out to a predetermined size from a belt-like sheet (tape-like sheet) 15A. At this time, the pattern sheets 15 are cut at regular intervals so that the patterns 17 appear uniformly on the individual pattern sheets 15 that are cut out, and are sequentially placed on the nonwoven fabric.

  A film serving as a waterproof sheet 12 is overlaid on the exterior sheet 11, sandwiched between heating rollers 20 and applied with heat, and individual pattern sheets between a nonwoven fabric serving as the exterior sheet 11 and a film serving as a waterproof sheet. 15 is sandwiched and bonded.

  Next, the hot-melt adhesive 16b is applied to the upper surface of the joined body of the nonwoven fabric to be the exterior sheet 11 and the film to be the waterproof sheet 12. And as shown in FIG. 6, the absorption layer 13 is installed on the said joined body so that a space | interval and the relative position with the said pattern sheet 15 may match | combine. A hot melt adhesive 16 c is applied to the surface of the absorbent layer 13.

  And the nonwoven fabric used as the inner surface sheet 14 is laminated | stacked on the absorption layer 13, these laminated bodies are pinched | interposed into a heating roller, and each layer is mutually adhere | attached. Thereafter, the leg opening is cut by the cutting line L1, and divided into individual laminated bodies, that is, a laminated body having the front surface portion 2A, the rear surface portion 2C, and the intermediate portion 2B by the cutting line L2. Further, the lateral side portion 4A of the front surface portion 2A and the lateral side portion 4C of the rear surface portion 2C are joined to form a pants type as shown in FIG.

  In the above process, the description of the mounting process of the elastic member 7 and the elastic member 8 is omitted.

  3 and 4 are cross-sectional views showing other embodiments of the structure of the laminated body forming the disposable diaper 1, and FIG. 4 is a cross-sectional view showing a reference example of the structure of the laminated body.

  In the case shown in FIG. 3, a nonwoven fabric 21 that is a hydrophobic sheet having air permeability and moisture permeability is superimposed on the inside of the exterior sheet 11, and the pattern sheet 15 is interposed between the nonwoven fabric 21 and the exterior sheet 11. It is sandwiched and bonded. The nonwoven fabric 21 is, for example, a spunbond nonwoven fabric formed of polypropylene fibers, or a sheet in which a spunbond nonwoven fabric, a melt blown nonwoven fabric, and a spunbond nonwoven fabric are stacked.

  In the case shown in FIG. 4, a waterproof film is used as the exterior sheet 22. This waterproof film is a resin film such as polyethylene or polypropylene, and has air permeability and moisture permeability. The waterproof film is transparent or translucent and has a light transmittance that allows the pattern 17 of the pattern sheet 15 to be seen through.

  Hot melt adhesive 16a is applied to the inner surface of the waterproof film exterior sheet 22, and the pattern sheet 15 is stacked and bonded. And the absorption layer 13 is located inside the pattern sheet 15.

  Next, FIGS. 7A and 7B are rear views showing a modification of the attachment position of the pattern sheet 15.

  7A, the pattern sheet 15 is attached to the rear surface portion 2C of the disposable diaper 1 at a position where the pattern sheet 15 is shifted to the right side and at a well-balanced position as a whole. In the case shown in FIG. 7B, in the rear surface portion 2C, two pattern sheets 15 on which different patterns are printed are divided into left and right and attached at a well-balanced position.

  Thus, in this invention, the pattern 17 can be attached | subjected to the arbitrary positions of the diaper 1, and arbitrary numbers, and the freedom degree of design can be raised.

  The pattern sheet 15 is not limited to a square or a rectangle, but may be a circle or an ellipse in addition to a polygon such as a triangle or a pentagon.

  In addition, the disposable diaper of this invention is not restricted to the underpants type shown in FIG. 1, The so-called open type of an hourglass type may be sufficient.

The perspective view which shows a underpants type diaper as one embodiment of this invention, Sectional drawing of the II-II line of the underpants type diaper shown in FIG. Sectional drawing which shows other embodiment of laminated structure, Sectional drawing which shows the reference example of laminated structure, The perspective view which shows the manufacturing method of the disposable diaper of this invention, The perspective view which shows the manufacturing method of the disposable diaper of this invention, (A) (B) is a rear view showing a modification of the position where the pattern is applied to the diaper;

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2A Front part 2B Middle part 2C Rear surface part 3A Front waist part 3C Rear waist part 5 Waist opening part 6 Leg opening part 7 and 8 Elastic member 11 Exterior sheet 12 Waterproof sheet 13 Absorbent layer 14 Inner sheet 15 Pattern sheet 17 Pattern 16a, 16b, 16c Hot melt adhesive

Claims (4)

An exterior sheet facing outward, a liquid-permeable inner sheet oriented toward the liquid-receiving side, and an absorbent layer positioned between the exterior sheet and the inner sheet, and applied to the abdomen of the wearer In a disposable diaper formed with a front part, an intermediate part applied to the crotch part, and a rear part applied to the back side,
A liquid-impervious sheet is superimposed on the inside of the exterior sheet, and a moisture-permeable pattern sheet on which a pattern is printed in multiple colors is provided between the exterior sheet and the liquid-impermeable sheet, The multicolor pattern can be seen through the exterior sheet, and the pattern sheet has an area of 50% or less of the area of the diaper when the disposable diaper is viewed from the back or the front. A disposable diaper having a pattern sheet characterized by   The disposable diaper having a pattern sheet according to claim 1, wherein the pattern sheet is bonded and fixed to the exterior sheet.   The pattern sheet is attached so as not to be applied to any of a waist gather formed in the waist opening, a leg gather provided in the leg opening, and a waistline gather formed from the front surface portion to the rear surface portion. A disposable diaper having the patterned sheet according to claim 1. The disposable diaper which has the pattern sheet in any one of Claim 1 thru | or 3 with which the said pattern sheet is provided in both the said front part and the said rear surface part.