JP4008838B2 - Excrement absorption sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an excrement absorbing sheet for absorbing excrement of pets.
[0002]
[Prior art]
Recently, in order to treat the excrement of pets such as dogs and cats kept in the home, pet excrement absorption sheets have been used. This pet excrement absorption sheet is generally composed of a liquid-permeable top sheet such as a nonwoven fabric, a liquid-impervious back sheet such as a resin film, and an absorbent core interposed between the top sheet and the back sheet. It was.
[0003]
However, depending on the position of the pet's urination, the urine may splash out of the excreta absorbing sheet, and especially puppies are instinctively urinating sideways by raising their hind legs, so urine is There was a problem that the surrounding wall became dirty due to many scattering.
[0004]
In order to solve such problems, a urine mat for dogs (see, for example, Patent Document 1) in which a rectangular absorbent mat can be bent and continuously installed from the floor to the wall, a rectangular absorbent mat, and the absorbent mat. And a flap extending from at least one side, and the flap has an extension length of 0.3 times or more of a side length of the absorbent mat parallel to the extension direction of the flap. (See, for example, Patent Document 2).
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. 3-6205 [Patent Document 2]
Japanese Patent Laid-Open No. 2001-8568
However, these excreta absorbent sheets can prevent urine from splashing to the wall side, but have not been able to prevent urine from being scattered in the direction where there is no wall. I couldn't use it because I couldn't.
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and provides an excreta absorbent sheet that can prevent the urine of a pet from scattering even in a place without a wall and can be used in any place in a room. It is in.
[0008]
[Means for Solving the Problems]
The excrement absorbing sheet of the present invention is formed by laminating a shape-retaining sheet on one surface of a waste absorbing sheet body composed of a water-absorbing top sheet and a water-impermeable back sheet, and is folded by folding the shape-retaining sheet. It is characterized in that the music part is erected.
[0009]
The top sheet used in the present invention may be a sheet having water absorption, but is preferably formed from a water permeable sheet and a water absorbent mat laminated on the back surface thereof.
[0010]
The water-permeable sheet is not particularly limited as long as it is a sheet having water permeability. For example, polyethylene resin fiber, polypropylene resin fiber, nylon resin fiber, polyester resin fiber, acrylic resin fiber, rayon fiber, cotton, suf, etc. A woven fabric and a nonwoven fabric are mentioned. Moreover, the sheet | seat provided with the through-hole in synthetic resin films, such as a polyethylene resin and a polypropylene resin, may be sufficient.
[0011]
The water-absorbing mat is not particularly limited as long as it has a water-absorbing mat shape. For example, a pulp in which a superabsorbent resin is dispersed or a laminate in which a superabsorbent resin layer is laminated on both sides of a pulp layer. In addition, those wrapped with water-absorbing paper such as tissue are preferable.
[0012]
As the superabsorbent resin, any conventionally known superabsorbent resin can be used. For example, polyacrylic acid-based, polyvinyl alcohol-based, maleic anhydride and other addition polymers, polyether-based, starch-based, cellulose-based And other polysaccharides and proteins such as collagen.
[0013]
The back sheet used in the present invention is a sheet for preventing excrement such as pet urine from penetrating and contaminating the floor and the like, and may be non-permeable, for example, polyethylene resin, Examples of the synthetic resin sheet include polypropylene resin, nylon resin, and polyester resin.
[0014]
The excrement absorbing sheet main body used in the present invention is composed of the water-absorbent top sheet and the non-water-permeable back sheet, and the top sheet is formed from the water-permeable sheet and a water-absorbing mat laminated on the back surface. In this case, the back sheet is laminated on the water absorbent mat side.
[0015]
Arbitrary laminating methods may be adopted as the laminating method of these sheets. For example, a method of adhering with an adhesive or pressure sensitive adhesive such as rubber, acrylic, urethane, or silicon, an ethylene-vinyl acetate copolymer And a method of bonding with a hot melt adhesive such as a linear low density polyethylene resin, a method of sewing with a sewing machine, and the like.
[0016]
The shape-retaining sheet used in the present invention is a sheet that can hold the folded shape when folded, and the bent portion formed by folding is held by the shape-retaining sheet and is erected. Is done.
[0017]
The shape-retaining sheet is preferably lightweight and can be incinerated with pet excreta, etc., and is preferably a stretched olefin resin sheet having a stretch ratio of 10 to 40 times. This stretched olefin resin sheet is a sheet. The folded shape is maintained by folding the film substantially at right angles to the stretching direction.
[0018]
As the olefin-based resin constituting the stretched olefin-based resin sheet, any olefin-based resin having a 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 low-density Polyethylene resin, polypropylene resin, ethylene-propylene copolymer, ethylene-pentene-1 copolymer, ethylene-vinyl acetate copolymer, ethylene- (meth) acrylate copolymer, ethylene-vinyl chloride copolymer, Examples thereof include an ethylene-propylene-butene copolymer, and a high-density polyethylene resin is preferably used.
[0019]
The stretched olefin-based resin sheet is preferably highly stretched 10 to 40 times and has high mechanical strength such as tensile strength and elastic modulus. Since strength is not improved, 0.94 g / cm ³ or more is preferable.
[0020]
Also, the weight average molecular weight of the high-density polyethylene resin is preferably 200,000 to 500,000 because the mechanical strength does not improve much even if stretched if it becomes too small, and film forming and stretching becomes difficult if it becomes too large. The melt index (MI) is preferably 0.1 to 20 and more preferably 0.2 to 10 because the film formability is excellent.
[0021]
The stretched olefin resin sheet is highly stretched 10 to 40 times. When the draw ratio is small, the mechanical strength is not improved, and when it is large, it is easy to tear, so it is 10 to 40 times, preferably 20 to 35 times.
[0022]
Although any conventionally known method may be adopted as the method for stretching the olefin resin sheet, it is highly stretched by 10 to 40 times. Therefore, after rolling the olefin resin sheet, stretching or stretching is repeated a plurality of times. A method of multi-stage stretching is preferred.
[0023]
The rolling is a method in which an olefin-based resin sheet is supplied to a pair of rolls rotating in opposite directions and pressed to reduce the thickness of the sheet and extend, and the rolled sheet differs from the stretched sheet in that it is an olefin-based sheet. Since the resin is dense without being oriented, it is highly stretchable.
[0024]
The rolling temperature cannot be uniformly rolled when the temperature is low, and melt-cut when it is high. Therefore, the roll temperature during rolling is preferably in the range of "melting point-40 ° C" to the melting point of the olefin resin of the olefin resin sheet to be rolled. More preferably, it is “melting point−30 ° C.” to “melting point−5 ° C.” of the olefin resin.
[0025]
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).
[0026]
If the rolling ratio is small, the subsequent stretching is burdened, and increasing the rolling ratio makes rolling difficult, so 4 to 10 times is preferable. In the present invention, the rolling ratio and the stretching ratio are values obtained by grading the cross-sectional area of the sheet before rolling or stretching by the cross-sectional area of the sheet after rolling or stretching.
[0027]
The stretching may be any conventionally known method, and examples thereof include a method of stretching while heating with a heater or hot air by a roll stretching method or a zone stretching method.
[0028]
The stretching temperature cannot be uniformly stretched when the temperature is lowered, and the sheet melts and cuts when the temperature is increased. Therefore, the range of “melting point−60 ° C.” to the melting point of the olefin resin of the stretched olefin resin sheet is preferable, and more preferably, the olefin It is “melting point−50 ° C.” to “melting point−5 ° C.” of the base resin.
[0029]
In addition, since the overall draw ratio is 10 to 40 times, the draw ratio may be determined so that the overall draw ratio is within this range in consideration of the rolling ratio. Is not improved, it is preferably 2 times or more, more preferably 3 times or more. The overall draw ratio is a value obtained by multiplying the rolling ratio and the draw ratio.
[0030]
When the stretched olefin-based resin sheet is thin, the mechanical strength is lowered. When the stretched olefin-based resin sheet is thick, the stretched olefin-based resin sheet is easily cracked in the stretching direction. Therefore, the thickness is generally 0.05 to 1 mm, preferably 0.1 to 0.5 mm. .
[0031]
The excrement absorbing sheet of the present invention is formed by laminating a shape-retaining sheet on at least one surface of the excreta absorbing sheet body, but may be laminated on both surfaces of the excreta absorbing sheet body. When the shape-retaining sheet is laminated only on one side of the excrement absorbing sheet body, the bent sheet is held so that the bent portion is erected by folding the shape-retaining sheet. It is preferable to be laminated.
[0032]
In addition, since the bent portion is held upright by folding the shape-retaining sheet, the shape-retaining sheet is laminated integrally from the end of the excreta absorbing sheet body to the inside of the bent portion. It is preferable that
[0033]
The shape-retaining sheet may be laminated on the entire surface of the excrement absorbing sheet body, or a plurality of shape-retaining sheets cut into an appropriate shape such as a square or a rectangle may be partially laminated. In addition, a plurality of shape-retaining sheets cut into a rectangular shape in the central direction from each side of the substantially rectangular excrement absorbing sheet main body are stacked, or a rectangular shape is cut in the central direction from the periphery of the substantially circular excrement absorbing sheet main body. When a plurality of shape-retaining sheets are laminated, a dish-shaped excrement absorbing sheet can be formed by bending the shape-retaining sheets to form a bent portion.
[0034]
When the shape-retaining sheet is a stretched olefin resin sheet, it is preferably laminated on the back sheet with a hot melt adhesive that can be bonded at a temperature lower than the temperature at which the stretched olefin resin sheet shrinks.
[0035]
When bonding with the hot melt adhesive, the hot melt adhesive may be melted and bonded while being applied, or a hot melt adhesive sheet may be laminated and bonded while being heated and pressed. When the heating temperature becomes high, the stretched olefin resin sheet shrinks, so that the stretched olefin resin sheet does not substantially heat shrink, that is, the “melting point of the thermoplastic resin constituting the stretched thermoplastic resin sheet. Adhesion is preferably performed at -10 ° C or lower.
[0036]
When the excreta absorbing sheet of the present invention is rectangular, a non-permeable flap may be extended on one side of the excreta absorbing sheet body. If a locking device such as an adhesive sheet is installed at the end of the flap, the flap can be fixed to the wall surface with this locking device, and the excreta absorbing sheet is installed in front of the wall surface. Can do.
[0037]
Moreover, if a non-permeable flap is extended on one side of the excrement absorbing sheet body and a shape-retaining sheet is laminated on the other three sides, the dish-shaped excrement absorbing sheet is fixed in front of the wall surface. Can be installed. In these cases, the flap is preferably provided by extending the back sheet. Furthermore, scattering of urine and the like can be prevented by stacking a shape-retaining sheet on the flap and standing the flap.
[0038]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an example of the excreta absorbing sheet of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG.
[0039]
In the figure, 2 is a water-permeable sheet made of a polyethylene resin fiber nonwoven fabric having a length of 80 cm, a width of 75 cm, and a thickness of 30 μm, and 3 is a sheet formed by dispersing a highly water-absorbent resin of polyacrylic acid resin in pulp. The water-absorbing mat has a length of 50 cm, a width of 60 cm, and a thickness of 1 cm. The top sheet 1 is formed by laminating the water-permeable sheet 2 and the water-absorbing mat 3.
[0040]
In the figure, 4 is a non-water-permeable back sheet made of a stretched polypropylene resin film having a length of 80 cm, a width of 95 cm, and a thickness of 30 μm. The water-permeable sheet is formed by an ethylene-vinyl acetate hot melt adhesive through a water absorbent mat 3. The excrement absorption sheet main body is formed by being bonded to 2.
[0041]
The water-permeable sheet 2 is laminated from the right end in the figure of the back sheet 4, and the water absorbent mat 3 is laminated at a distance of 15 cm from the right end and the upper and lower ends in the figure of the back sheet 4. A flap 6 is formed in the part. Double-sided adhesive tapes 7 and 7 are attached to the flap 6 so that the flap 6 can be fixed to a wall surface or the like.
[0042]
In the figure, 5... Is a shape-retaining sheet made of a stretched polyethylene resin sheet. The manufacturing method and lamination method of a stretched polyethylene resin sheet are as follows.
[0043]
A high-density polyethylene resin (manufactured by Nippon Polychem Co., Ltd.) having a weight average molecular weight (Mw) of 3.3 × 10 ⁵ and a melting point of 135 ° C. is supplied to the same-direction biaxial kneading extruder (manufactured by Plastic Engineering Laboratory), and the resin temperature is 200 After melt-kneading at 0 ° C., the melt-kneaded product was formed into a sheet having a width of 34 cm and a thickness of 5.0 mm using a calender molding machine controlled at a roll temperature of 110 ° C. to obtain a polyethylene resin sheet.
[0044]
The obtained polyethylene resin sheet was rolled at a rolling ratio of 9.4 times using a rolling machine (manufactured by Sekisui Koki Co., Ltd.) heated to 120 ° C. to obtain a rolled sheet having a width of 34 cm and a thickness of 530 μm.
[0045]
The obtained rolled sheet is subjected to multi-stage stretching of 3.0 times with a hot-air heating type multi-stage stretching apparatus (manufactured by Kyowa Engineering) heated to 110 ° C., a total stretching ratio of 28.2 times, a width of 20 cm, and a thickness of 300 μm. A stretched polyethylene resin sheet was obtained.
[0046]
A linear low density polyethylene resin sheet (manufactured by Sekisui Film Co., Ltd.) having a melting point of 120 ° C., a width of 20 cm and a thickness of 30 μm is applied to one side of a stretched polyethylene resin sheet obtained using a film fusion apparatus (manufactured by Konan Design Industry Co., Ltd.). A laminated sheet having a thickness of 330 μm was obtained by heat fusion (sheet temperature 125 ° C.) with a heating roll at 0 ° C.
[0047]
The obtained laminated sheet is cut into a length of 20 cm and a width of 10 cm, the end in the length direction is aligned with the end of the back sheet 4, and at an interval of 10 cm at the approximate center in the width direction of the back sheet 4. Was placed so as to face the direction of the flap 6 and heat-sealed with a press machine at 120 ° C. and 5.0 kg / cm ² .
[0048]
In the pet sheet of the present invention shown in FIG. 1, when the shape-retaining sheet 5 is bent, an outer bent portion is erected from the bent portion of the excrement absorbing sheet body, and the excrement of pets and the like is erected. Spattering is prevented.
[0049]
【The invention's effect】
The configuration of the excreta absorbing sheet according to claim 1 is as described above, and since the bent portion can be erected by bending the shape maintaining sheet, it is possible to prevent the urine from being scattered from the pet, In particular, since any place or the entire circumference around the excreta absorbing sheet can be erected, it is possible to prevent the urine of pets from being scattered even in a place without a wall, and excretion of pets at any place in the room. It can be used as an excreta absorbing sheet that absorbs things.
[0050]
The excrement absorbing sheet according to claim 3 is also lightweight and easy to handle because the shape maintaining sheet is also composed of a stretched olefin resin sheet, and can be incinerated when abandoned. Furthermore, it can be folded compactly before and after use and can be easily transported and carried.
[Brief description of the drawings]
FIG. 1 is a plan view showing an example of a waste absorption sheet according to the present invention.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Surface sheet 2 Water-permeable sheet 3 Water absorption mat 4 Back surface sheet 5 Shape maintenance sheet 6 Flap 7 Double-sided adhesive tape

Claims (4)

A shape-retaining sheet is laminated on at least one surface of the excreta absorbing sheet body composed of a water-absorbing top sheet and a non-permeable back sheet, and the bent portion is erected by folding the shape-retaining sheet. The excreta absorption sheet | seat characterized by being made to. The excrement absorbing sheet according to claim 1, wherein the shape-retaining sheet is integrally laminated from the end of the excrement absorbing sheet main body to the inside. The shape-retaining sheet is a stretched olefin resin sheet having a stretch ratio of 10 to 40 times, and is laminated so that a stretching direction and a bending direction of the stretched olefin resin sheet are substantially perpendicular to each other. The excreta absorbing sheet according to 1 or 2. The excreta absorbent sheet according to claim 3, wherein the stretched olefin resin sheet is laminated on the back sheet with a hot melt adhesive.

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