JP2009291470A - Diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diaper retaining a certain shape in a girth fixing part even if a hand is released, easily bending along the girth, and retaining the shape after bending. <P>SOLUTION: The diaper is composed of a diaper body with a body-fluid absorber interposed between a body fluid-permeable top sheet and a body fluid-impermeable back sheet, and the girth fixing part connected to both ends of the diaper body. An oriented polyolefin resin sheet or rod is stuck on the girth fixing part. The oriented polyolefin resin sheet or rod of the diaper has such a shape retainability that the return angle θ from bending in 5 minutes after the release is not more than 20 degrees if the polyolefin resin sheet or rod is bent by 180 degrees or 90 degrees and retained for one minute and released thereafter. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a diaper.

Conventionally, disposable diapers are frequently used for urination and defecation of infants and the elderly. For example, as a paper diaper, a bodily fluid absorber is interposed between the bodily fluid permeable top sheet and the bodily fluid impermeable back sheet so that it can be appropriately fitted and fixed to the waists of all different people around the waist, The leg-side stretchable member is fixed under stretch at the article side end on the side of the body fluid absorber to form a leg-around stretchable part that stretches in the front-rear direction. There has been proposed a disposable paper diaper (see, for example, Patent Document 1) in which a waist stretchable part that is fixed under stretching and stretches in the width direction is formed, and the waist stretchable part is pulled laterally in use.
JP 2008-86506 A

  When using the above-mentioned paper diapers, the waist stretchable part must be stretched and fixed, but as soon as it is released it shrinks to its original shape and there are two fixing parts, so it is fixed with adhesive tape However, it was difficult to fix, and sometimes it could not be fixed well symmetrically.

In addition, underpants type diapers (see, for example, Patent Documents 2 and 3) are often used so that this fixing is not required, but the underpants type diapers are moved like a bedridden elderly person or a patient immediately after surgery. It was difficult to use for people with difficult conditions.
Japanese Patent Laid-Open No. 10-127687 JP 2001-178771 A

  In view of the above problems, the object of the present invention is to provide a diaper that retains a certain shape even when the waist fixing portion is released and can be bent easily along the waist and can retain its shape after bending. Is to provide.

That is, the present invention
[1] A diaper comprising a diaper main body in which a bodily fluid absorber is interposed between a bodily fluid permeable top sheet and a bodily fluid impermeable back sheet, and waist fixing portions connected to both ends thereof. The stretched polyolefin resin sheet or rod is laminated on the waist fixing part, the stretched polyolefin resin sheet or rod is bent at 180 degrees and 90 degrees and held for 1 minute, then released, and 5 minutes after release. A diaper characterized by having a shape-retaining property in which both bending return angles θ are 20 degrees or less,
[2] A diaper comprising a diaper main body in which a bodily fluid absorber is interposed between a bodily fluid permeable top sheet and a bodily fluid impermeable back sheet, and waist fixing portions connected to both ends thereof. The woven fabric of polyolefin resin sheet or rod is laminated on the waist fixing part, the fabric is bent at 180 degrees and 90 degrees, held for 1 minute, released, and folded when 5 minutes have passed after release. A diaper characterized by being woven as a warp or / and a weft of a stretched polyolefin resin sheet or rod having a shape-retaining property in which both bending return angles θ are 20 degrees or less,
[3] The above-mentioned [1], wherein the stretched polyolefin resin sheet or rod is obtained by uniaxially stretching a polyolefin resin sheet or rod having a weight average molecular weight of 100,000 to 500,000 at a stretch ratio of 5 times or more. [2] Diapers described in the
[4] The stretched polyolefin resin sheet or rod is uniaxial with the total stretch ratio of 10 to 40 times after the polyolefin resin sheet or rod having a weight average molecular weight of 100,000 to 500,000 is rolled to a rolling ratio of 5 times or more. The diaper according to [1] or [2] above, which is stretched, and
[5] The above-mentioned [1] or [1], wherein the stretched polyolefin resin sheet or rod is formed by rolling a polyolefin resin sheet or rod having a weight average molecular weight of 100,000 to 500,000 to a rolling ratio of 5 times or more. 2] Regarding the diaper described.

  The configuration of the diaper of the present invention is as described above. Even if the waist fixing portion releases the hand, it maintains a certain shape and can be bent easily along the waist, and the shape can be maintained after bending. So it can be used easily.

  The diaper according to claim 1 includes a diaper main body in which a bodily fluid absorber is interposed between a bodily fluid permeable top sheet and a bodily fluid impermeable back sheet, and a waist fixing portion connected to both ends thereof. The stretched polyolefin resin sheet or rod is laminated on the waist fixing part, and the stretched polyolefin resin sheet or rod is bent at 180 degrees and 90 degrees and held for 1 minute before being released. In addition, it is characterized in that it has a shape-retaining property in which the folding return angle θ is less than 20 degrees when 5 minutes have passed after release.

  FIG. 1 is a plan view showing an example of the diaper of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. In the figure, reference numeral 1 denotes a diaper main body, which forms a body fluid-permeable top sheet 11 such as a non-woven fabric or a porous film, and forms a polyethylene sheet, a poly-laminated nonwoven fabric, or a microvoid to transmit vapor but transmit liquid. It is made of cotton-like pulp or the like to which a polymer-absorbing polymer is added as appropriate between the body fluid-impermeable back sheet 12 made of a non-fluid sheet, etc., and has an appropriate shape such as a rectangular shape or an hourglass shape. The body fluid absorber 13 is interposed.

  At both ends of the diaper main body 1, waist fixing portions 2 and 2 longer than the width of the diaper main body 1 are connected. The waist circumference fixing part 2 is made of a laminated sheet of the top sheet 11 and the back sheet 12, for example. The stretched polyolefin resin sheets 3 and 3 that are continuous from the vicinity of one end to the vicinity of the other end are respectively laminated on the waist fixing portions 2 and 2. The stretched polyolefin-based resin sheet 3 is a sheet having shape retention that is bent at 90 degrees and held for 1 minute and then released, and the folding return angle θ is 20 degrees or less when 5 minutes have passed after release. .

  Reference numeral 4 denotes an adhesive tape for fixing the waist fixing portion 2. The stretched polyolefin resin sheet 3 may be composed of short stretched polyolefin resin sheets laminated in the vicinity of both ends, or a plurality of stretched polyolefin resin sheets may be laminated substantially continuously. Further, instead of the stretched polyolefin resin sheet 3, it is bent after 90 degrees and held for 1 minute and then released, and has a shape retention property such that the folding return angle θ is 20 degrees or less when 5 minutes have passed after release. One or a plurality of stretched polyolefin resin rods may be laminated substantially in parallel.

  The above-mentioned stretched polyolefin resin sheet and rod have shape retainability, but the shape retainability is released after the stretched polyolefin resin sheet or rod is bent at 180 degrees or 90 degrees and held for 1 minute. When 5 minutes have passed, the folding return angle θ is both 20 degrees or less, preferably the 180-degree folding return angle θ is 20 degrees or less and the 90-degree folding return angle θ is less than 20 degrees, more preferably The 180-degree folding return angle θ is 20 degrees or less and the 90-degree folding return angle θ is 15 degrees or less. If one of the bending return angles θ at the time of 180-degree and 90-degree bending, particularly the 90-degree bending return angle θ exceeds 20 degrees, sufficient shape retention may not be obtained.

  As the polyolefin-based resin constituting the stretched polyolefin-based resin sheet or rod, any olefin-based resin having film forming ability can be used, for example, a high-density polyethylene resin, a medium-density polyethylene resin, a low-density polyethylene resin, a linear shape Low density polyethylene resin, polypropylene resin, ethylene-propylene copolymer, ethylene-butene-1 copolymer, ethylene-pentene-1 copolymer, ethylene-hexene-1 copolymer, ethylene-octene-1 copolymer , Ethylene-vinyl acetate copolymer, ethylene- (meth) acrylic ester copolymer, ethylene-vinyl chloride copolymer, ethylene-propylene-butene copolymer, etc. High density polyethylene resin is preferably used Is done.

  When the weight average molecular weight of the polyolefin resin is less than 100,000, the polyolefin resin becomes brittle and the stretchability is lowered, or a stretched polyolefin resin sheet having sufficient mechanical strength or creep resistance is obtained. On the contrary, when it exceeds 500,000, the melt viscosity becomes high, the hot melt molding processability is lowered, and it becomes difficult to obtain a uniform sheet, and therefore 100,000 to 500,000 is preferable. In the present invention, the weight average molecular weight is a value measured by gel permeation chromatography (GPC).

The melt index (hereinafter referred to as MI) of the polyolefin resin is preferably from 0.1 to 20 (g / 10 minutes), more preferably from 0.2 to 10 (g / 10 minutes), which is excellent in film moldability. It is. MI is an index representing the melt viscosity of a thermoplastic resin specified in JIS K 7210. Furthermore, in the case of a high density polyethylene resin, 0.94 g / cm ³ or more is preferable because the mechanical strength does not improve even if the density is reduced even if the density is reduced.

  As the stretched polyolefin resin sheet or rod, a stretched polyolefin resin sheet or rod having a shape-retaining property in which a polyolefin resin sheet having a weight average molecular weight of 100,000 to 500,000 is uniaxially stretched at a stretch ratio of 5 times or more is preferable. .

  In this case, the polyolefin resin is preferably a high-density polyethylene resin having an intrinsic viscosity [η] of less than 3.5 dl / g, such as glass fiber, talc, mica, calcium carbonate, magnesium hydroxide, alumina, zinc oxide, magnesium oxide, It is preferable to add inorganic machine fillers such as aluminum hydroxide, silica alumina, titanium oxide, calcium oxide, calcium silicate, basic magnesium carbonate, carbon fiber, and carbon black.

  The thickness of the polyolefin resin sheet before stretching is not particularly limited, but if it is too thick, stretching becomes difficult. Conversely, if it is too thin, the thickness of the polyolefin resin sheet after stretching becomes too thin. Since shape retainability deteriorates, 0.2 to 5.0 mm is desirable. Further, the cross-sectional shape of the polyolefin resin rod before stretching is not particularly limited, and examples thereof include a circle, a triangle, a quadrangle, a hexagon, and the like. If it is too long, stretching becomes difficult. Conversely, if it is too thin, the thickness of the polyolefin-based resin rod after stretching becomes too thin and the shape retainability decreases, so the diameter is 0.2 to 5.0 mm. desirable.

  The stretched polyolefin resin sheet or rod that has been stretched has a stretch ratio of 5 times or more and has shape retention, but is preferably 10 to 40 times. The stretching method may be any conventionally known method, such as a method of stretching while heating with a heater or hot air by a uniaxial stretching method such as a roll uniaxial stretching method or a zone uniaxial stretching method. .

  When stretching uniaxially to a high degree of 10 to 40 times, a multistage uniaxial stretching method in which uniaxial stretching is repeated a plurality of times is preferable. When performing multistage uniaxial stretching, the number of stretching is preferably 2 to 20 times, more preferably 3 to 15 times, still more preferably 4 to 10 times. When performing multi-stage stretching by a roll uniaxial stretching method, it is desirable to install a feeding pinch roll, a take-up pinch roll, and at least one, preferably a plurality of contact rolls that rotate at a constant speed between these rolls. By installing such a contact roll, uniform stretchability is improved and stable stretch molding can be performed.

  The contact roll is uniaxially stretched by applying a frictional force to the polyolefin resin sheet or rod without being pinched. Further, the contact roll may be connected to the feeding roll and / or the take-up roll by a connecting member made of a gear, a chain, a pulley, a belt, or a combination thereof.

  The uniaxial stretching temperature cannot be uniformly stretched when it is low, and the sheet melts and cuts when it is high. Is “melting point−50 ° C.” to “melting point−5 ° C.” of the polyolefin resin.

  In order to improve the dimensional stability of the stretched polyolefin resin sheet or rod, the stretched polyolefin resin sheet or rod may be annealed at a temperature ranging from “melting point −60 ° C.” to the melting point of the polyolefin resin. If the annealing temperature is lowered, the dimensional stability will not improve, warping will occur if used for a long time, and if it is raised, the polyolefin resin will dissolve and the orientation will disappear and the tensile modulus, tensile strength, etc. will decrease. It is preferable to anneal at a temperature between the “melting point−60 ° C.” and the melting point of the resin.

  Annealing is a heat treatment in the production line. When annealing, the stretched polyolefin resin sheet or rod is stretched if a large tension is applied, and if it is not tensioned or very small, it contracts. Therefore, it is preferable to carry out in a state in which the length of the stretched polyolefin resin sheet or rod in the stretching direction is not substantially changed, and it is preferable that no pressure is applied to the stretched polyolefin resin sheet or rod. That is, it is preferable that the annealed stretched polyolefin resin sheet or rod is annealed so that the length of the stretched polyolefin resin sheet or rod before annealing is 1.0 or less.

  Accordingly, when the stretched polyolefin resin sheet or rod is continuously annealed while being moved in the heating chamber by a roll such as a pinch roll, the feed rate ratio of the polyolefin resin sheet or rod on the inlet side and the outlet side is 1.0. It is preferable that the annealing is performed with setting as follows.

  The heating method at the time of annealing is not particularly limited, and examples thereof include a method of heating with hot air, a heater, a heating plate, hot water or the like. The annealing time is not particularly limited, and varies depending on the thickness of the stretched polyolefin resin sheet or rod and the annealing temperature, but is generally preferably 10 seconds or more, more preferably 30 seconds to 60 minutes, and even more preferably 1 ~ 20 minutes.

  In addition, as a different preferred stretched polyolefin resin sheet or rod, a polyolefin resin sheet or rod having a weight average molecular weight of 100,000 to 500,000 is rolled to a rolling ratio of 5 times or more, and then the total stretching ratio is increased to 10 to 40 times. Examples thereof include a uniaxially stretched polyolefin resin sheet or rod.

  The thickness of the polyolefin-based resin sheet before rolling is not particularly limited, but if it is too thick, stretching becomes difficult, and in the rolling process, a large pressing force is required to crush the polyolefin-based resin sheet with a rolling roll. Take-up force is required, and uniform rolling in the width direction may be difficult due to bending of the rolling roll. Conversely, when too thin, the thickness of the polyolefin resin sheet after rolling becomes too thin and uniform rolling. Is not only difficult, but the rolling rolls may come into contact with each other to shorten the life of the rolling roll, so 0.2 to 5.0 mm is desirable. Further, the cross-sectional shape of the polyolefin resin rod before rolling is not particularly limited, and examples thereof include a circle, a triangle, a quadrangle, a hexagon, and the like. If it is too large, rolling may be difficult because it requires a large pressing force and take-up force to crush with a rolling roll. Conversely, if it is too thin, the thickness of the polyolefin resin rod after stretching will be too thin, resulting in a shape. Since the retainability is lowered, the diameter is preferably 0.2 to 5.0 mm.

  The polyolefin-based resin sheet or rod is first rolled to a rolling ratio of 5 times or more, but the rolling temperature cannot be uniformly rolled when the temperature is lowered, and melted and cut when the temperature is high. The range of “melting point −40 ° C.” to the melting point of the olefin resin of the polyolefin resin sheet or rod to be rolled is preferable, and more preferably “melting point −30 ° C.” to “melting point −5 ° C.” of the olefin resin. . In the present invention, the melting point refers to the maximum point of the endothermic peak that accompanies melting of the crystal, which is recognized when thermal analysis is performed with a differential scanning calorimeter (DSC).

  If the applied pressure (linear pressure) applied to the polyolefin resin sheet or rod by the rolling roll is too small, it may not be possible to obtain a predetermined rolling magnification. If it is too large, the rolling roll will only bend. No slip is likely to occur between the rolling roll and the raw sheet or rod, and uniform rolling may be difficult, so the applied pressure is preferably 100 MPa to 3000 MPa, more preferably 300 MPa to 1000 MPa. .

  When the rolling ratio is less than 5 times, the effect of suppressing necking at the time of uniaxial stretching performed later cannot be obtained, high-strength uniaxial stretching cannot be performed, or the uniaxial stretching step Therefore, it is 5 times or more, preferably 7 times or more. There is no particular upper limit to the rolling ratio, but the higher the rolling ratio, the more load is applied to the rolling equipment, so 10 times or less is preferable. The rolling magnification is defined as (cross-sectional area of polyolefin resin sheet) / (cross-sectional area of polyolefin resin sheet after rolling), but the width of the polyolefin resin sheet hardly changes before and after rolling. (Thickness of resin sheet) / (thickness of polyolefin resin sheet after rolling).

  Next, the rolled polyolefin resin sheet or rod is uniaxially stretched at a total stretch ratio of 10 to 40 times. The uniaxial stretching method is not particularly limited, and the above-described uniaxial stretching method may be adopted. Moreover, since the total draw ratio is 10 to 40 times, the uniaxial draw ratio may be determined so that the total draw ratio is within this range in consideration of the rolling ratio. Is not improved, it is preferably 1.3 times or more, more preferably 1.5 times or more, and still more preferably 1.8 times or more. Moreover, although an upper limit is not specifically limited, 4 times or less are preferable, More preferably, it is 3.5 times or less. The total draw ratio is a value obtained by multiplying the rolling ratio and the uniaxial draw ratio.

  Further, as another preferable stretched polyolefin resin sheet or rod, a stretched polyolefin resin sheet or rod obtained by rolling a polyolefin resin sheet having a weight average molecular weight of 100,000 to 500,000 to a rolling ratio of 5 times or more can be mentioned. That is, even if it is not uniaxially stretched only by rolling, it is released after being bent at 180 degrees and 90 degrees and held for 1 minute, and the folding return angle θ when 5 minutes have elapsed after release is both 20 degrees or less. A stretched polyolefin resin sheet having shape retention can also be suitably used.

  In order to improve the dimensional stability of the stretched polyolefin resin sheet or rod stretched by the stretching method including the rolling step, the stretched polyolefin resin sheet has a melting point of “melting point −60 ° C.” to a melting point of the polyolefin resin, You may anneal at the temperature below rolling temperature.

  If the annealing temperature is lowered, the dimensional stability will not improve, warping will occur if used for a long time, and if it is raised, the polyolefin resin will dissolve and the orientation will disappear and the tensile modulus, tensile strength, etc. will decrease. It is preferable to anneal the resin at a temperature ranging from “melting point −60 ° C.” to the melting point and not higher than the rolling temperature. Other annealing methods are as described above.

  The annealed stretched polyolefin resin sheet or rod may be further aged in a temperature range from 40 ° C. to the melting point of the polyolefin resin. The dimensional stability of the polyolefin resin sheet or rod annealed by aging becomes more excellent.

  Aging is not a continuous treatment in the production line, but it is a relatively long time (minutes, hours) for heat treatment of single-wafers, scrolls, etc., once processed, such as cut winding, of a stretched polyolefin resin sheet or rod. (Unit) Means heat treatment by laying down carefully. The aging temperature is the same as that left at room temperature when the temperature is low, and when it is high, it is thermally deformed, so the temperature range is from 40 ° C. to the melting point of the polyolefin resin, and the aging time is not effective in a short time and is too long. Even if an effect does not increase, 12 hours-7 days are preferable.

The thickness of the stretched polyolefin resin sheet is not particularly limited. However, when the thickness is reduced, the shape retaining property is lowered. When the thickness is increased, the stretched polyolefin resin sheet is less likely to be deformed. 04-2 mm is preferable. Also, the width of the stretched polyolefin resin sheet is not particularly limited, but is preferably 0.5 to 200 mm, more preferably 1 to 50 mm.
The cross-sectional shape of the stretched polyolefin resin rod is not particularly limited, and examples thereof include a circle, a triangle, a quadrangle, a hexagon, and the like, and the thickness is not particularly limited. In addition, when it is laminated on the waist fixing portion of the diaper, a sense of incongruity occurs, and conversely, when it becomes thinner, the shape retaining property decreases, so the diameter is preferably 0.04 to 5.0 mm. In addition, it is also possible to obtain a stretched polyolefin resin rod by cutting the stretched polyolefin resin sheet with a width close to its thickness.

  A second polyolefin resin is used for laminating a plurality of stretched polyolefin resin sheets or rods on the surface of the stretched polyolefin resin sheet or rod by heat-sealing or heat-sealing to the waist fixing portion. Layers may be stacked. The second polyolefin resin layer may be laminated only on one side of the stretched polyolefin resin sheet or on both sides. The second polyolefin resin layer may be laminated on only a part of the surface of the stretched polyolefin resin rod or may be laminated on the entire surface.

  Since the polyolefin resin constituting the second polyolefin resin layer is laminated on the stretched polyolefin resin sheet or rod, it is the same type as the polyolefin resin constituting the stretched polyolefin resin sheet or rod described above. Although it is preferable, since it acts as an adhesive when heat-sealing the stretched polyolefin resin sheet or rod, a polyolefin having a melting temperature lower than the melting temperature of the polyolefin resin constituting the stretched polyolefin resin sheet or rod Resin is preferred, and linear low density polyethylene resin is preferred.

  The method of laminating the second polyolefin resin layer on the stretched polyolefin resin sheet or rod may be any conventionally known method, for example, the second polyolefin resin layer and the stretched polyolefin resin sheet or rod. And a method in which a second polyolefin resin is melt-extruded and laminated on a stretched polyolefin resin sheet.

  Further, the thickness of the second polyolefin resin layer is not particularly limited, but if it becomes too thin, it becomes difficult to adhere, and if it is too thick, the shape-retaining property of the stretched polyolefin resin sheet is lowered. It is -150 micrometers, Preferably it is 20-80 micrometers.

  When the second polyolefin resin layer is laminated on the stretched polyolefin resin sheet or rod, the laminate sheet or laminate rod of the stretched polyolefin resin sheet or rod and the second polyolefin resin layer is 180 degrees and 90 degrees. It is released after being bent for 1 minute and then released, and the shape returnability is such that the folding return angle θ is 20 degrees or less when 5 minutes have passed after release.

  The diaper according to claim 2 includes a diaper main body in which a bodily fluid absorber is interposed between a bodily fluid permeable top sheet and a bodily fluid impermeable back sheet, and a waist fixing portion connected to both ends thereof. In this diaper, a polyolefin resin sheet or a rod fabric is laminated on the waist fixing part, the fabric is folded at 180 degrees and 90 degrees and held for 1 minute, then released, and 5 minutes after release. It is characterized in that a stretched polyolefin resin sheet or rod having a shape-retaining property whose folding return angle θ is 20 degrees or less when lapsed is woven as warp or / and weft.

  That is, instead of the stretched polyolefin resin sheet or rod in the diaper of claim 1, it is bent at 180 degrees and 90 degrees and held for 1 minute, then released, and the folding return angle θ when 5 minutes have passed after release. Is a diaper obtained by laminating a stretched polyolefin resin sheet or rod having a shape retention property of 20 degrees or less as a warp or / and a weft and laminated on a waist fixing portion.

  In the woven fabric, both the warp and the weft may be a stretched polyolefin resin sheet or rod, or one of the warp or the weft may be a stretched polyolefin resin sheet or rod. When one of the warp or weft is a stretched polyolefin resin sheet or rod, a commonly used thread may be used as the other warp or weft, for example, natural fibers such as cotton, silk, hemp, polyester Examples thereof include synthetic fibers such as fibers, urethane fibers, and nylon fibers.

  The woven fabric can be easily bent by hand to fit around the waist, and the fixed part needs to hold its shape even when the hand is released, so it was folded at 180 degrees and 90 degrees and held for 1 minute. It is preferable to have a shape retaining property in which the bending return angle θ is 20 degrees or less when 5 minutes have passed after the release.

  As the weaving method of the woven fabric, any conventionally known method can be adopted, for example, plain weave, twill weave, satin weave, etc., and it has the shape retention of the stretched polyolefin resin sheet or rod as it is. Plain weave is preferred because it is preferred.

  Although the width | variety of the extending | stretching polyolefin resin sheet which forms the said textile fabric is not specifically limited, Generally 1-20 mm is preferable, More preferably, it is 2-10 mm. In particular, a woven fabric made of a large number of stretched polyolefin resin sheets having a narrow width is preferable because it feels better. Also, the thickness of the stretched polyolefin resin rod is not particularly limited, but when it becomes thick, it becomes difficult to weave and when it is laminated on the waist fixing part of the diaper, it becomes uncomfortable. Since the retainability is lowered, the diameter is preferably 0.04 to 5.0 mm.

  When both warp and weft are formed of a stretched polyolefin resin sheet or rod, the stretched polyolefin resin sheet or rod that is a warp and the stretched polyolefin resin sheet or rod that is a weft are both stretched in the length direction. In this way, the warp and weft drawing directions are orthogonal, and therefore the shape-retaining direction is also orthogonal, so that the shape can be bent and held in any direction.

  In the woven fabric, the warp and the weft that are in contact with each other may be bonded. Any conventionally known method can be adopted as the bonding method. Examples thereof include a method of bonding with an adhesive and a method of heat-sealing. In particular, when the second polyolefin resin layer is laminated on the stretched polyolefin resin sheet or rod, it is preferably heat-sealed.

  The stretched polyolefin resin sheet may be a laminated stretched polyolefin resin sheet in which a plurality of stretched polyolefin resin sheets are laminated. The stretching directions of the stretched polyolefin resin sheets laminated may be the same or different. The stretched polyolefin resin rod may be a rod formed by bonding a plurality of the stretched polyolefin resin rods.

  As a laminated stretched polyolefin resin sheet in which a plurality of stretched polyolefin resin sheets having different stretching directions are laminated, for example, a laminated stretched polyolefin resin in which two stretched polyolefin resin sheets are laminated so that the stretching directions are orthogonal to each other Sheet, laminated stretched polyolefin resin sheet in which three stretched polyolefin resin sheets are laminated by shifting the stretching direction by 60 degrees, and laminate in which four stretched polyolefin resin sheets are laminated by shifting the stretching direction by 45 degrees Examples thereof include a stretched polyolefin resin sheet.

  The stretched polyolefin-based resin sheet has shape retention when bent in a direction perpendicular to the stretching direction, and when two or more stretched polyolefin-based resin sheets having different stretching directions are bonded, two or more stretched polyolefins The shape-retaining property in an arbitrary direction is improved by the stretching direction of the resin-based resin sheet, and the stretched polyolefin-based resin sheet is hardly broken even if the stretching direction and the bending direction of the stretched polyolefin-based resin sheet are the same.

  The thickness when the stretched polyolefin resin sheet is laminated is not particularly limited. However, when the thickness is reduced, the shape retaining property is lowered. ˜2 mm is preferred.

  In addition, since the laminated stretched polyolefin resin sheet is laminated with the stretched polyolefin resin sheet, when it becomes thick, the shape retention is lowered, but it is released after being bent at 90 degrees and held for 1 minute, and 5 minutes have passed after release. It is preferable that the bending return angle θ at the time is 20 degrees or less.

  When the above-mentioned laminated stretched polyolefin resin sheet is formed by laminating a plurality of stretched polyolefin resin sheets so that the stretching direction is the same, a laminated stretched polyolefin resin sheet that is a warp and a laminated stretched polyolefin resin that is a weft Both the sheets are preferably stretched in the length direction, so that the warp and weft stretch directions are perpendicular to each other, and thus the shape retention direction is also perpendicular to any direction. It becomes possible to bend and hold the shape.

Next, examples of the present invention will be described, but the present invention is not limited to the examples.
(Example 1)
A high-density polyethylene resin (manufactured by Nippon Polyethylene Co., Ltd.) having a weight average molecular weight (Mw) of 330,000 and a melting point of 135 ° C. is supplied to the same-direction biaxial kneading extruder (manufactured by Plastic Engineering Laboratory) and melt kneaded at a resin temperature of 200 ° C. After that, the melt-kneaded material was formed into a sheet having a width of 370 mm and a thickness of 2.5 mm using a calender molding machine controlled at a roll temperature of 110 ° C. to obtain a polyethylene resin sheet.

  The obtained polyethylene resin sheet was rolled at a rolling ratio of 9.5 times using a rolling molding machine (manufactured by Sekisui Koki Co., Ltd.) heated to 125 ° C. to obtain a rolled polyethylene resin sheet having a thickness of 0.27 mm. The obtained rolled polyethylene resin sheet was stretched 1.82 times in a hot-air heating type multi-stage stretching apparatus (manufactured by Kyowa Engineering) heated to 110 ° C., with a total stretching ratio of 17 times, a width of 280 mm, and a thickness of 0 A 19 mm stretched polyethylene resin sheet was obtained.

  The obtained stretched polyethylene resin sheet was supplied with a pinch roll to a hot air heating tank with a line length of 19.25 m set at 125 ° C. at an inlet speed of 2.75 m / min, and an outlet speed of 2.75 m / min. Set to, and then subjected to primary annealing for 7 minutes, followed by secondary annealing in the same manner to obtain an annealed stretched polyethylene resin sheet, which is then fed to a constant temperature bath at 60 ° C. and aged for 24 hours, An aged stretched polyethylene resin sheet was obtained.

  The obtained stretched polyethylene resin sheet was cut into a width of 1 cm and a length of 15 cm, bent at 180 degrees and 90 degrees so as to be orthogonal to the stretching direction of the stretched polyethylene resin sheet, held for 1 minute, and then released. When the bending return angle θ was measured when minutes passed, it was 4 to 7 degrees, respectively.

  A linear low density polyethylene resin (melting point: 121 ° C.) is extruded on one surface of the obtained stretched polyethylene resin sheet, and a linear low density polyethylene resin layer having a thickness of 30 μm is laminated to form an adhesive layer having a thickness of 0.22 mm. A stretched polyethylene resin sheet was obtained. The obtained stretched polyethylene resin sheet having an adhesive layer is cut into a width of 1 cm and a length of 15 cm, bent at 180 degrees and 90 degrees so as to be orthogonal to the stretching direction of the stretched polyethylene resin sheet, held for 1 minute, and then released. When the folding return angle θ was measured after 5 minutes from the release, it was 4 degrees to 7 degrees, respectively.

  As shown in FIG. 1, a polymer-absorbing polymer was added between a substantially rectangular body fluid-permeable top sheet 11 made of a nonwoven fabric and a body fluid-impermeable back sheet 12 made of a polyethylene resin sheet. A waist longer than the width of the diaper body 1 formed by extending a top sheet 11 and a back sheet 12 at both ends of the diaper body 1 made of cotton pulp and having a rectangular body fluid absorber 13 interposed therebetween. The surrounding fixing parts 2 and 2 are provided continuously. The stretched polyolefin resin sheet (width 28 mm) having the obtained adhesive layer was heat-sealed from one end to the other end of the waist fixing portion 2 to obtain a diaper of the present invention.

  The shape of the obtained diaper was maintained, and the waistline fixing part 2 did not deform even when the hand was released. Moreover, the waist circumference fixing | fixed part 2 applied to the test subject's waist could be easily attached by bending by hand.

(Example 2)
A linear low density polyethylene resin (melting point: 121 ° C.) is extruded on both sides of the stretched polyethylene resin sheet obtained in Example 1, and a linear low density polyethylene resin layer having a thickness of 30 μm is laminated to have a thickness of 0.25 mm. A stretched polyethylene resin sheet having an adhesive layer was obtained. The obtained stretched polyethylene resin sheet having an adhesive layer is cut into a width of 1 cm and a length of 15 cm, bent at 180 degrees and 90 degrees so as to be orthogonal to the stretching direction of the stretched polyethylene resin sheet, held for 1 minute, and then released. When the folding return angle θ was measured after 5 minutes from the release, it was 4 degrees to 7 degrees, respectively.

  The obtained stretched polyethylene resin sheet having an adhesive layer was cut into a width of 2 mm and plain woven as warp and weft to obtain a plain woven fabric. The polyethylene resin sheets in the warp and the weft are both stretched in the length direction, and the stretching directions of both are orthogonal.

  The obtained woven fabric was bent along the length direction of the warp at 180 degrees and 90 degrees and held for 1 minute, then released, and the bending return angle θ after 5 minutes elapsed from the release was measured. It was 7 degrees. Further, when the bending return angle θ was measured in the same manner along the length direction of the weft, it was 4 degrees to 7 degrees, respectively.

  Using the obtained woven fabric, a diaper of the present invention was obtained in the same manner as in Example 1. The shape of the obtained diaper was maintained, and the waistline fixing part 2 did not deform even when the hand was released. Moreover, the waist circumference fixing | fixed part 2 applied to the test subject's waist could be easily attached by bending by hand.

It is a top view which shows an example of the diaper of this invention. It is AA sectional drawing in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Diaper body 2 Waist circumference fixing part 3 Stretched polyolefin resin sheet 4 Adhesive tape

Claims (5)

  A diaper comprising a diaper main body in which a body fluid absorber is interposed between a body fluid permeable top sheet and a body fluid impermeable back sheet, and waist fixing portions connected to both ends of the diaper body. When a stretched polyolefin resin sheet or rod is laminated on the periphery fixing part, the stretched polyolefin resin sheet or rod is bent at 180 degrees and 90 degrees and held for 1 minute and then released, and when 5 minutes have passed since the release. A diaper characterized by having a shape-retaining property in which both bending return angles θ are 20 degrees or less.   A diaper comprising a diaper main body in which a body fluid absorber is interposed between a body fluid permeable top sheet and a body fluid impermeable back sheet, and waist fixing portions connected to both ends of the diaper body. Polyolefin-based resin sheet or rod fabric is laminated around the fixed part, the fabric is folded at 180 degrees and 90 degrees and held for 1 minute, then released, and the folding return angle when 5 minutes have passed after release. A diaper characterized in that a stretched polyolefin resin sheet or rod having a shape-retaining property in which both θ are 20 degrees or less are woven as warp yarns and / or weft yarns.   The diaper according to claim 1 or 2, wherein the stretched polyolefin resin sheet or rod is formed by uniaxially stretching a polyolefin resin sheet or rod having a weight average molecular weight of 100,000 to 500,000 at a stretch ratio of 5 times or more. .   After the polyolefin resin sheet or rod having a weight average molecular weight of 100,000 to 500,000 is rolled to a rolling ratio of 5 times or more, the stretched polyolefin resin sheet or rod is uniaxially stretched to a total stretching ratio of 10 to 40 times. The diaper according to claim 1 or 2, wherein   The diaper according to claim 1 or 2, wherein the stretched polyolefin resin sheet or rod is formed by rolling a polyolefin resin sheet or rod having a weight average molecular weight of 100,000 to 500,000 to a rolling ratio of 5 times or more.

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