WO2022137961A1 - 歯ブラシ - Google Patents
歯ブラシ Download PDFInfo
- Publication number
- WO2022137961A1 WO2022137961A1 PCT/JP2021/043085 JP2021043085W WO2022137961A1 WO 2022137961 A1 WO2022137961 A1 WO 2022137961A1 JP 2021043085 W JP2021043085 W JP 2021043085W WO 2022137961 A1 WO2022137961 A1 WO 2022137961A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- toothbrush
- less
- grip
- molded product
- foam molded
- Prior art date
Links
- 239000006260 foam Substances 0.000 claims abstract description 96
- 229920005989 resin Polymers 0.000 claims abstract description 64
- 239000011347 resin Substances 0.000 claims abstract description 64
- 238000003860 storage Methods 0.000 claims abstract description 19
- 239000011800 void material Substances 0.000 claims abstract description 19
- 210000004209 hair Anatomy 0.000 claims description 17
- 230000001680 brushing effect Effects 0.000 description 24
- 230000000694 effects Effects 0.000 description 23
- 210000003491 skin Anatomy 0.000 description 13
- 238000011156 evaluation Methods 0.000 description 9
- 238000005187 foaming Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 239000004088 foaming agent Substances 0.000 description 7
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- -1 polypropylene Polymers 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229920001155 polypropylene Polymers 0.000 description 5
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 239000000806 elastomer Substances 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 210000003780 hair follicle Anatomy 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 229920001707 polybutylene terephthalate Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 229920006324 polyoxymethylene Polymers 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 2
- 239000004156 Azodicarbonamide Substances 0.000 description 2
- DQEFEBPAPFSJLV-UHFFFAOYSA-N Cellulose propionate Chemical compound CCC(=O)OCC1OC(OC(=O)CC)C(OC(=O)CC)C(OC(=O)CC)C1OC1C(OC(=O)CC)C(OC(=O)CC)C(OC(=O)CC)C(COC(=O)CC)O1 DQEFEBPAPFSJLV-UHFFFAOYSA-N 0.000 description 2
- MWRWFPQBGSZWNV-UHFFFAOYSA-N Dinitrosopentamethylenetetramine Chemical compound C1N2CN(N=O)CN1CN(N=O)C2 MWRWFPQBGSZWNV-UHFFFAOYSA-N 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 239000001099 ammonium carbonate Substances 0.000 description 2
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 2
- 235000019399 azodicarbonamide Nutrition 0.000 description 2
- 229920006218 cellulose propionate Polymers 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 210000000214 mouth Anatomy 0.000 description 2
- 239000011112 polyethylene naphthalate Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 235000017550 sodium carbonate Nutrition 0.000 description 2
- ISNKSXRJJVWFIL-UHFFFAOYSA-N (sulfonylamino)amine Chemical compound NN=S(=O)=O ISNKSXRJJVWFIL-UHFFFAOYSA-N 0.000 description 1
- MFJDFPRQTMQVHI-UHFFFAOYSA-N 3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound O=C1OCOC(=O)C2=CC=C1C=C2 MFJDFPRQTMQVHI-UHFFFAOYSA-N 0.000 description 1
- NBOCQTNZUPTTEI-UHFFFAOYSA-N 4-[4-(hydrazinesulfonyl)phenoxy]benzenesulfonohydrazide Chemical compound C1=CC(S(=O)(=O)NN)=CC=C1OC1=CC=C(S(=O)(=O)NN)C=C1 NBOCQTNZUPTTEI-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 229920005601 base polymer Polymers 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229920006026 co-polymeric resin Polymers 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 210000003811 finger Anatomy 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 210000003813 thumb Anatomy 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B5/00—Brush bodies; Handles integral with brushware
- A46B5/02—Brush bodies; Handles integral with brushware specially shaped for holding by the hand
- A46B5/021—Grips or handles specially adapted to conform to the hand
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B5/00—Brush bodies; Handles integral with brushware
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B2200/00—Brushes characterized by their functions, uses or applications
- A46B2200/10—For human or animal care
- A46B2200/1066—Toothbrush for cleaning the teeth or dentures
Definitions
- the present invention relates to a toothbrush.
- This application claims priority based on Japanese Patent Application No. 2020-214656 filed in Japan on December 24, 2020, the contents of which are incorporated herein by reference.
- a toothbrush has a rod-shaped grip portion, a neck portion extending from the tip of the grip portion, a toothbrush body having a head portion provided at the tip of the neck portion, and a plurality of hairs implanted in the head portion. It is composed of a bundle and.
- the toothbrush body is made of a hard resin so as to prevent the grip portion from bending excessively during brushing and to give sufficient force to the teeth from the bristles.
- a toothbrush whose main body is made of only hard resin has a hard grip and is hard to bend, so its grip is inferior. As a result, the toothbrush may be operated incorrectly during brushing, which may injure the oral cavity.
- a toothbrush having a grip that partially or completely covers the surface of a rod-shaped core formed of a hard resin with a soft resin is available. It has been proposed (for example, Patent Document 1). Further, a toothbrush having a structure in which a soft resin and a hard resin are each exposed on the surface of the grip portion has been proposed (for example, Patent Document 2).
- the present invention has been made in consideration of the above points, and an object of the present invention is to provide a toothbrush capable of enhancing grip without any design restrictions.
- the toothbrush according to one embodiment of the present invention is provided with a grip portion having a length along the center line, a neck portion extending from the tip of the grip portion, and a side of the neck portion opposite to the grip portion.
- the toothbrush body includes a toothbrush body having a head portion, a brush portion composed of a plurality of hair bundles planted in the head portion, and the toothbrush body has a grip portion main body, a neck portion, and a head portion.
- the foamed molded body has a base member made of a hard resin and a foamed molded body made of a soft resin provided on the surface of the grip portion main body, and the foamed molded body has a filled portion and a plurality of void portions, and the foamed body is provided.
- the storage elasticity G'of the molded product is 104 Pa or more and 106.5 Pa or less.
- the grip portion can be appropriately deformed with a normal grip force, and the grip on the hand is good and brushing is easy. Is obtained.
- the loss elastic modulus G ′′ of the foam molded product may be configured to be 104 Pa or more and 106.5 Pa or less.
- the loss tangent (loss elastic modulus ⁇ storage elastic modulus) of the soft resin may be 0.05 or more.
- the foam molded body when the toothbrush is gripped, the foam molded body is deformed by a force that is easy to grip, and the deformation speed is not too fast and not too slow, so that the user can easily grip the toothbrush.
- the shore A hardness of the soft resin may be less than 30.
- the mode of the size in the plurality of voids may be in the range of 0.001 mm 2 or more and 0.3 mm 2 or less.
- the number of 80% of all the voids in the foam molded body is in the range of ⁇ 0.3 mm 2 with respect to the mode of the size of all the voids. It may be the configuration inside.
- the average value of the occupancy ratio of the plurality of voids is in the range of 2% or more and 60% or less. May be good.
- the softness effect of the foamed molded product is enhanced, and a foamed molded product that can be appropriately deformed when the toothbrush is gripped can be obtained.
- the density of the soft resin may be in the range of 0.55 g / cm3 or more and 0.8 g / cm3 or less.
- the cross section of the grip portion intersecting the center line is composed of the base member and the foam molded body, and the cross-sectional area of the base member and the cross-sectional area of the foam molded body are divided.
- the ratio of the cross-sectional area of the foamed molded product to the total total area may be less than 50%.
- the sinking effect of the foamed molded product due to the plurality of voids can be enhanced, the softness of the gripped portion can be improved, and the presence of the base member inside the foamed molded product makes the gripped portion. Since the whole is not deformed, good operability of the toothbrush can be ensured.
- the thickness of the foam molded product may be 2 mm or more and 5 mm or less.
- the grip portion has a skin layer forming the surface of the grip portion and a foam layer in which the filling portion and the plurality of gap portions are covered with the skin layer.
- the ratio of the thickness of the skin layer to the foam layer in the cross section intersecting the center line may be in the range of 1: 1 or more and 1:10 or less.
- the ratio of the foamed molded product formed in the entire length direction of the grip portion may be in the range of 50% or more and 100% or less.
- the foam molded body is provided in a region of more than half of the portion touched by the hand, which makes it easier to grip.
- the present invention can provide a toothbrush that can enhance grip without any design restrictions.
- FIG. 1 is a front view showing a toothbrush according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
- FIG. 3 is a graph showing the size distribution of the void portion in the foam molded product.
- FIGS. 1 and 2 show one aspect of the present invention, do not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. Further, in the following drawings, in order to make each configuration easy to understand, the scale and number of each structure are different from the actual structure.
- FIG. 1 is a front view showing a toothbrush 1 according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
- the toothbrush 1 of the present embodiment is composed of a toothbrush main body 2 and a brush portion 3, and has a long shape having a length along the center line O.
- the toothbrush main body 2 is a grip portion 21 having a length along the center line O, a neck portion 22 extending from the tip of the grip portion 21 along the center line O, and a tip side of the neck portion 22. It has a head portion 23 provided on the side opposite to the grip portion 21.
- the toothbrush 1 may have a configuration in which the neck portion 22 is not provided between the grip portion 21 and the head portion 23.
- the head portion 23 is formed in a substantially rectangular shape when viewed from the front.
- the head portion 23 has a flocked surface 23a on the front side.
- a plurality of flocked holes 23b are formed on the flocked surface 23a.
- 26 flocked holes 23b are formed on the flocked surface 23a, but the number of flocked holes 23b is not limited to this.
- each hair follicle hole 23b a hair bundle 31 in which a plurality of hairs are bundled in a substantially columnar shape is planted.
- the brush portion 3 is composed of a plurality of hair follicles 31 planted in each hair follicle hole 23b.
- Examples of the hair constituting the hair bundle 31 include straight hair, hair whose diameter gradually decreases toward the tip (tapered hair), tip branch hair, spiral hair, and hair for irregular cross section.
- Examples of the tip shape of the hair bundle 31 include flat cutting, mountain cutting, convex shape, and concave shape. The type of hair to be used and the shape of the tip of the hair bundle 31 are appropriately set in consideration of the cleaning effect required for the brush portion 3 and the feeling of contact with the gums.
- the neck portion 22 is arranged between the grip portion 21 and the head portion 23, and is a portion that connects the grip portion 21 and the head portion 23.
- the neck portion 22 of the present embodiment extends from the head portion 23 toward the grip portion 21 with a predetermined width, and is formed so that the width increases toward the grip portion 21 at the rear end.
- the length and width of the neck portion 22 are appropriately set in consideration of the material and the like, and the dimensions are such that the operability in the oral cavity and the reachability to the back teeth can be enhanced while ensuring the necessary strength as the neck portion 22. ..
- the grip portion 21 is a portion gripped by the user and is formed in a long columnar shape.
- the length from the position W in the front view to the rear end of the toothbrush 1 shall be, for example, 80 mm or more and 140 mm or less. Is preferable.
- the grip portion 21 is connected to the rear end side of the neck portion 22 so as to draw a continuous smooth curve in its shape.
- the length from the position W1 shown in FIG. 1 to the rear end of the toothbrush 1 is defined as the grip portion 21, but the range of the grip portion 21 is not limited to this.
- the length from the position W2 where the center of curvature changes on the rear end side of the neck portion 22 to the rear end of the toothbrush 1 may be the grip portion 21.
- the toothbrush main body 2 configured in this way, the surface of the grip portion 21 gripped by hand during brushing is made of soft resin.
- the toothbrush main body 2 includes a base member 201 made of a hard resin and a foam molded body 202 made of a soft resin.
- the foam molded body 202 is provided so as to cover a part of the base member 201 (the portion corresponding to the grip portion 21).
- the overall shape of the toothbrush body 2 is a smooth shape with no step at the boundary between the base member 201 and the foam molded body 202.
- the base member 201 has a head portion 23, a neck portion 22, and a grip portion main body 21A.
- the base member 201 can be manufactured by injection molding using a hard resin.
- polypropylene is preferable because it has high adhesiveness to a soft resin.
- resin materials it is preferable to use materials such as POM, PBT, and PEN in terms of high strength and easy thinning of the head portion 23.
- materials such as POM, PBT, and PEN in terms of high strength and easy thinning of the head portion 23.
- one kind of resin may be used alone, or two or more kinds of resins may be used in combination.
- the foam molded body 202 is a porous body having a large number of holes inside, and is provided so as to cover the entire surface of the grip portion main body 21A on the rear end side of the base member 201 on the rear end side of the neck portion 22.
- the grip portion main body 21A In the direction intersecting the center line O, the grip portion main body 21A has a cylindrical shape smaller than the width and thickness at the rear end of the neck portion 22.
- the grip portion main body 21A extends with a constant diameter in the length direction.
- the foam molded body 202 is formed so as to fill the step 4 formed at the boundary position between the neck portion 22 and the grip portion 21 in the base member 201.
- the gripping portion main body 21A of the base member 201 is not limited to a cylindrical shape and can be appropriately changed.
- the foam molded body 202 has a foam layer 202A and a skin layer 202B formed on the outermost surface of the foam layer 202A.
- the foam layer 202A has a filling portion 202b and a plurality of void portions 202c formed in the filling portion 202b.
- the foam layer 202A has a closed cell structure in which each of the plurality of void portions 202c is surrounded by the filling portion 202b, and the void portion 202c does not exist in the skin layer 202B. Therefore, the outer peripheral surface (surface of the grip portion 21) of the skin layer 202B is a smooth curved surface.
- a resin softer than the hard resin used for the base member 201 can be used, and in the present embodiment, a resin having a shore A hardness of less than 30 can be used. ..
- the soft resin constituting the foam molded product 202 include resins having a shore A hardness of less than 30 among elastomer resins such as styrene-based and olefin-based.
- the shore A hardness of the soft resin constituting the foam molded product 202 is more preferably in the range of 0 to 25, further preferably in the range of 0 to 20.
- the shore A hardness of the soft resin is not more than the upper limit value, an excellent fit feeling can be obtained when the grip portion 21 is gripped by hand.
- the shore A hardness becomes higher than the upper limit value the foamed molded product 202 is less likely to be deformed, and the fit to the hand when the toothbrush 1 is gripped is lowered.
- the shore A hardness means the hardness measured according to JIS K 7215 or JIS K 6253.
- styrene-based elastomer resin it is preferable to use a styrene-based elastomer resin from the viewpoint of easiness of deformation and softness.
- the soft resin constituting the foam molded product 202 one type may be used alone, or two or more types may be used in combination.
- the storage elastic modulus G'(compression condition: temperature 23 ° C., frequency: 1 Hz) of the soft resin constituting the foam molded product 202 is preferably in the range of 104 Pa or more and 106.5 Pa or less, preferably 105.5 Pa or more and 106.5 Pa. The following range is more preferable. As a result, it is possible to perform appropriate deformation with a normal grip force, and it is possible to obtain an effect that the grip on the hand is good and brushing is easy.
- the storage elastic modulus G'of the foamed molded product 202 When the storage elastic modulus G'of the foamed molded product 202 is less than 104 Pa, it is deformed by a weak force, so that the foamed molded product 202 moves during brushing, the grip property is lowered, and it becomes difficult to polish. On the contrary, when the storage elastic modulus G'of the foamed molded product 202 exceeds 106.5 Pa, the foamed molded product 202 will not be deformed unless a strong force is applied. Therefore, the foamed molded product 202 is less likely to be deformed by a normal grip force, and the fit feeling when gripped is reduced.
- the loss elastic modulus G ′′ of the soft resin constituting the foam molded product 202 is preferably in the range of 104 Pa or more and 106.5 Pa or less, and more preferably in the range of 104.5 or more and 105.5 or less.
- the loss elastic modulus G'' of the foam molded body 202 is as small as less than 104 Pa, the deformation speed of the foam molded body 202 becomes high and the foam molded body 202 is momentarily deformed into the shape grasped by the user. At that time, since the repulsive force of the foam molded body 202 cannot be obtained immediately, it cannot be gripped well and it becomes difficult to grip.
- the loss elastic modulus G'' of the foam molded body 202 exceeds 106.5 Pa, the deformation speed of the foam molded body 202 becomes slow, and it takes time to deform into the shape grasped by the user. It ends up. Therefore, when the toothbrush is changed, it takes time to change from the shape in the gripped state before the change of the toothbrush to the shape in the gripped state until the toothbrush is changed. Since the deformation of the foam molded body 202 becomes difficult to return, the followability to the hand is lowered, and the usability when changing the toothbrush at the time of brushing is lowered.
- the loss tangent tan ⁇ (loss elastic modulus G'' / storage elastic modulus G') of the soft resin constituting the foam molded body 202 is within the range of 0.05 or more and 0.3 or less.
- the loss tangent tan ⁇ of the soft resin is less than 0.05, a force higher than that during normal brushing is required when deforming, and the repulsive force at which the deformation returns is also strong.
- the deformation speed is high and the followability to the hand is fast, it becomes difficult to maintain the deformation unless the hand is always pushed in, which makes it difficult to grip.
- the loss tangent tan ⁇ of the soft resin exceeds 0.3, it can be deformed with a weak force, but the deformation speed tends to be slow. Therefore, the followability of the shape when the grip of the hand is changed during brushing becomes slow, and it becomes difficult to grip.
- the foam molded product 202 is formed of a foamed resin obtained by blending a soft resin with a foaming agent and foaming it.
- the foaming agent is not particularly limited, and known chemical foaming agents and physical foaming agents can be used.
- examples of the base polymer include polyethylene (PE), polypropylene (PP), polystyrene (PS), acrylonitrilobogenstyrene (ABS), ethylene vinyl acetate (EVA), and the like.
- PE polyethylene
- PP polypropylene
- PS polystyrene
- ABS acrylonitrilobogenstyrene
- EVA ethylene vinyl acetate
- azodicarbonamide As foaming molecules, azodicarbonamide (ADCA), dinitrosopentamethylenetetramine (DNPT), azobisisobutyronitrile, azobisisobutyronitrile, barium azodicarboxylate, p, p'-oxybisbenzene in organic systems Sulfonylhydrazine (OBSH) and the like can be mentioned.
- Inorganic compounds include sodium carbonate, ammonium bicarbonate, sodium carbonate, ammonium carbonate and the like, which are carbonate compounds.
- a foaming aid may be used together with the foaming agent.
- the foaming aid include urea and urea derivatives.
- the blending amount of the foaming agent with respect to the soft resin is not particularly limited and is appropriately designed.
- the foam molded product 202 is composed of a foam layer 202A made of a foam resin and a non-foamed skin layer 202B.
- the foam layer 202A has a filling portion 202b and a plurality of void portions 202c. In the cross section of the foam molded body 202 in the direction intersecting the central axis, each void portion 202c exists independently in the filling portion 202b.
- the skin layer 202B is formed on the entire surface of the foam layer 202A.
- the mode size of the plurality of voids 202c in the foam molded product 202 is preferably within the range of 0.001 mm 2 or more and 0.3 mm 2 or less, and more preferably within the range of 0.01 mm 2 or more and 0.1 mm 2 or less. preferable. As a result, the effect that an appropriate flexibility of the foam molded product 202 can be obtained can be obtained.
- each void 202c is less than 0.001 mm 2 , the flexibility of the foam molded product 202 cannot be obtained. That is, since the amount of deformation of each gap portion 202c is small, it becomes difficult to obtain the sinking effect of the resin due to the deformation of the gap portion 202c. Therefore, when the toothbrush 1 is gripped, the fit to the hand is lowered.
- the mode size of the gap portion 202c exceeds 0.3 mm 2 , the sinking effect cannot be effectively obtained when the toothbrush 1 is gripped, so that the foamed molded product 202 does not become soft. , The fit to the hand is reduced. That is, the upper surface and the lower surface of the gap portion 202c (the surfaces facing each other in the direction in which the force is applied) are likely to come into contact with each other, and the resin sinking effect due to the deformation of the gap portion cannot be effectively obtained. Therefore, when the toothbrush 1 is gripped, the fit to the hand is lowered.
- the mode size of 80% of the plurality of voids 202c in the foam molded product 202 is preferably within the range of ⁇ 0.3 mm 2 , and more preferably within the range of ⁇ 0.2 mm 2 . This has the effect of obtaining more appropriate flexibility of the foam molded product 202. If it exceeds the above range, the desired softness of the foam molded product 202 with uniformity cannot be obtained.
- the foam molded body 202 can be molded by a short shot method using injection molding, a full shot method, a core back method, or the like.
- a short shot method using injection molding, a full shot method, a core back method, or the like.
- the average value of the occupancy ratio of the plurality of voids 202c is preferably in the range of 2% or more and 60% or less, and further, the upper limit is 50% or less. preferable. As a result, the softness effect of the foamed molded product 202 is enhanced, and the foamed molded product 202 that can be appropriately deformed when the toothbrush 1 is gripped can be obtained.
- the occupancy ratio of the plurality of voids 202c in the cross section of the foam molded product 202 is smaller than 2%, the amount of deformation of the foamed molded product 202 is small, and it is difficult to obtain softness.
- the occupancy ratio becomes larger than 60%, the strength of the foam molded body 202 is lowered, the independent bubbles of the voids 202c cannot be maintained, and the simultaneous bubbles increase, so that the softness is improved. Will decrease.
- the thickness of the foam molded product 202 is preferably 2 mm or more and 5 mm or less. As a result, an appropriate subduction effect can be obtained by the gap portion 202c, so that the grip property is improved. If the thickness of the foamed molded product 202 is less than 2 mm, an appropriate subduction effect due to the gap portion 202c cannot be obtained, and the softness of the foamed molded product 202 is lowered. On the contrary, when the thickness of the foam molded body 202 exceeds 5 mm, when the grip portion 21 is gripped, the foamed molded body 202 sinks very much and becomes too soft, which makes it difficult to grip.
- the density of the filled portion 202b in the foam molded product 202 is preferably in the range of 0.55 g / cm 3 or more and 0.8 g / cm 3 or less. As a result, it is possible to obtain the effect that flexibility can be obtained while ensuring the strength of the foam molded product 202.
- the density of the filling portion 202b is less than 0.55 g / cm 3 , the strength cannot be ensured. On the contrary, when the density of the filling portion 202b exceeds 0.8 g / cm 3 , flexibility cannot be ensured.
- the foam molded product 202 has a skin layer 202B and a foam layer 202A, and the ratio of these thicknesses is preferably 1: 1 or more and 1:10 or less, preferably 1: 5 or less. Is more preferable. As a result, the strength of the foamed molded product 202 does not decrease, and the softness improving effect of the void portion 202c of the foamed layer 202A can be obtained.
- the foam layer 202A in which the gap portion 202c is present is reduced, so that the softness improving effect of the gap portion 202c cannot be obtained.
- the gap portion 202c becomes close to the skin layer 202B, so that the gap portion 202c may be exposed on the surface. In this case, there is a concern that the strength of the foam molded product 202 may decrease or the appearance may be poor.
- the cross section of the grip portion 21 intersecting the center line O of the toothbrush 1 in the present embodiment is composed of the base member 201 and the foam molded body 202, and the cross-sectional area of the base member 201 and the cross-sectional area of the foam molded body 202 are combined.
- the ratio of the cross-sectional area of the foam molded product 202 to the total total area is preferably less than 50%, more preferably 20% or more and 40% or less.
- the ratio of the cross-sectional area of the foamed molded product 202 is less than 20% and is small, the subduction effect of the foamed molded product 202 due to the gap portion 202c is reduced, and the softness is reduced. On the contrary, when the ratio of the cross-sectional area of the foamed molded product 202 is 50% or more and is large, the strength of the toothbrush 1 is concerned.
- the proportion of the foam molded body 202 formed in the entire length direction of the grip portion 21 is preferably 50% or more and 100% or less, and the lower limit is more preferably 80% or more. As a result, when the grip portion 21 is gripped by hand during brushing, the foam molded body 202 is provided in a region of more than half of the portion touched by the hand, which makes it easier to grip.
- the foamed molded body 202 formed to the length direction of the gripped portion 21 is small, the foamed molded body 202 is provided on the entire portion touched by the hand when the gripped portion 21 is gripped by hand during brushing. It becomes difficult to grip because the boundary portion between the base member 201 made of a hard resin and the foamed molded body 202 is held so as to be covered by the hand. Therefore, if possible, it is preferable that the foam molded body 202 is present in substantially the entire region where the grip portion 21 is gripped by hand.
- the entire axial circumference of the grip portion main body 21A is covered with the foam molded body 202, so that the toothbrush 1 is covered at the time of brushing.
- the foam molded body 202 is present around the entire axis of the grip portion 21 that is gripped when held by hand.
- the foamed molded body 202 is three-dimensionally deformed to increase the contact area with the hand regardless of the gripping method, so that the grip portion 21 fits on the thumb, index finger, and palm. Therefore, the grip property with respect to the toothbrush 1 is improved, brushing becomes easy, and the toothbrush 1 having a comfortable grip can be obtained.
- foaming that partially covers the surface of the base member 201 is performed by performing secondary molding using a soft resin after obtaining a base member 201 made of a hard resin by primary molding.
- the molded body 202 is formed. In this way, it can be created without any design restrictions, and the design of the toothbrush 1 can be enhanced.
- Examples 1 to 16, Comparative Examples 1 to 2 Examples 1 to 16, Comparative Examples 1 to 2
- the toothbrushes of Examples 1 to 16 and Comparative Examples 1 and 2 were prepared in accordance with the specifications shown in Tables 1, 2 and 2 below, and the same samples as the toothbrushes shown in FIGS. 1 and 2 were prepared. ..
- Grip portion 21 total length 115 mm, maximum width 14.5 mm, maximum thickness 14.5 mm
- Base member 201 length 110 mm, width 8.5 mm, thickness 8.5 mm
- Foam molded product 202 Maximum coating thickness 3 mm
- Neck 22 Length 45 mm, minimum width 5 mm, minimum thickness 5 mm Head portion 23: length 25 mm, width 11 mm, thickness 4.5 mm
- the specification items in the samples of each Example and Comparative Example were the storage elastic modulus, the loss elastic modulus, the loss tangent, the A hardness, the mode of the size of the void, and the occupancy ratio of the void, which were set for each sample.
- a dynamic viscoelastic device (E4000) manufactured by UBM was used as a device for evaluating the storage elastic modulus.
- a test piece (10 mm square, 6 mm thick resin plate) is fixed to the dynamic viscoelastic device, and the storage elastic modulus and loss at a frequency of 1 Hz and a temperature of 23 ° C. as compression conditions.
- the elastic modulus was measured and the loss tangent was calculated.
- FIG. 3 is a graph showing the size distribution of the void portion 202c in the foam molded product 202.
- the vertical axis shows the number of gaps 202c
- the horizontal axis shows the size of the gaps 202c.
- the mode of the size of the gap 202c was 0.01 mm 2 to 0.1 mm 2 .
- the average value among them was 0.025 mm 2 .
- Average score is 6.6 points or more ⁇ : Average score is 5.5 or more and less than 6.5 points ⁇ : Average score is 4.6 points or more and less than 5.5 points ⁇ : Average score is 3.6 points or more 4 .Less than 5 points ⁇ : Average score is less than 3.5 points
- Examples 1 to Examples have a value of "storage elastic modulus G'(Log 10)" in the range of 4.0 or more and 6.5 or less. For 16 samples, good results were obtained for all of "easy to grip the grip 21 (fitting to the hand)", “deformation of the grip 21", and “easy to brush”. ..
- Example 15 the mode of the size of the void portion 202c in the foam molded product 202 is in the range of 0.01 mm 2 or more and 0.1 mm 2 or less. , The best results were obtained in Example 15. It can be said that the sample specification of Example 15 is the best mode.
Landscapes
- Brushes (AREA)
Abstract
Description
本願は、2020年12月24日に、日本に出願された特願2020-214656号に基づき優先権を主張し、その内容をここに援用する。
そのため、設計上の制約がなく、グリップ性を高めることのできる構成が望まれている。
なお、以下の実施形態は、本発明の一態様を示すものであり、この発明を限定するものではなく、本発明の技術的思想の範囲内で任意に変更可能である。また、以下の図面においては、各構成をわかりやすくするために、実際の構造と各構造における縮尺や数等を異ならせている。
本発明の歯ブラシについて、以下に図面を参照して説明する。
図1は、本発明の一実施形態にかかる歯ブラシ1を示す正面図である。図2は、図1におけるII-II線に沿う断面図である。
歯ブラシ本体2は、中心線Oに沿って長さを有する把持部21と、把持部21の先端から中心線Oに沿って延設されたネック部22と、ネック部22の先端側であって把持部21とは反対側に設けられたヘッド部23と、を有する。なお、歯ブラシ1としては、把持部21とヘッド部23との間にネック部22が設けられない構成であってもよい。
毛束31の先端形状は、平切り、山切り、凸状、凹状などが挙げられる。
用いる用毛の種類や毛束31の先端形状は、ブラシ部3に求める清掃効果や歯茎に対する当たり心地などを考慮して適宜設定される。
ネック部22の長さや幅は、材質等を勘案して適宜設定され、ネック部22としての必要な強度を確保しつつ、口腔内での操作性や奥歯への到達性を高められる寸法とする。
例えば、ネック部22の後端側において曲率中心が変化する位置W2から歯ブラシ1の後端までの長さを把持部21としてもよい。
歯ブラシ本体2は、硬質樹脂からなるベース部材201と、軟質樹脂からなる発泡成形体202と、を備えて構成されている。発泡成形体202は、ベース部材201の一部(把持部21に対応する部分)を覆って設けられている。歯ブラシ本体2の全体的な形状としては、ベース部材201と発泡成形体202との境界に段差はなく、滑らかな形状とされている。
ロニトリル、アゾジカルボン酸バリウム、p,p’-オキシビスベンゼンスルホニルヒドラジン(OBSH)などが挙げられる。また、無機系では、炭酸塩化合物である、重炭酸ナトリウム、重炭酸アンモニウム、炭酸ナトリウム、炭酸アンモニウムなどが挙げられる。本実施形態においては、エラストマー樹脂との相溶性や発泡温度の観点から、有機系の発泡分子を用いることが好ましい。
また、軟質樹脂に対する発泡剤の配合量は、特に限定されず、適宜設計される。
なお、上記範囲内を超えた場合は、発泡成形体202の均一性を持った所望の柔らかさを得ることができない。
これにより、空隙部202cによる適度な沈み込み効果を得ることができるので、グリップ性が向上する。
発泡成形体202の厚みが、2mm未満の場合、空隙部202cによる適度な沈み込み効果が得られず、発泡成形体202の柔らかさが低下してしまう。
逆に、発泡成形体202の厚みが5mmを超える場合は、把持部21を握った際、発泡成形体202の沈み込みが非常に大きくなり柔らかくなりすぎるため、握り込みにくくなる。
逆に、発泡層202Aに対してスキン層202Bが薄くなりすぎると、空隙部202cがスキン層202Bに近くなるので、空隙部202cが表面に露出してしまうおそれがある。この場合、発泡成形体202としての強度低下や外観不良が懸念される。
逆に、発泡成形体202の断面積の割合が50%以上で大きい場合は、歯ブラシ1としての強度が懸念される。
以下、実施例により本発明の効果をより明らかなものとする。なお、本発明は、以下の実施例に限定されるものではなく、その要旨を変更しない範囲で適宜変更して実施することができる。
本実施例では、下記表1,表2及び図2に示す仕様に従って、実施例1~16、比較例1~2の歯ブラシを、図1及び図2に示した歯ブラシと同様のサンプルを作製した。
把持部21:全長115mm、最大幅14.5mm、最大厚み14.5mm
ベース部材201:長さ110mm、幅8.5mm、厚み8.5mm
発泡成形体202:最大被覆厚み3mm
ネック部22と把持部21の境目(位置W):幅11mm、厚み11mm
ネック部22:長さ45mm、最小幅5mm、最小厚5mm
ヘッド部23:長さ25mm、幅11mm、厚み4.5mm
ハンドル体の構成材料として、PP樹脂を用いた。
貯蔵弾性率を評価する機器として、UBM社製の動的粘弾性装置(E4000)を用いた。
貯蔵弾性率の評価方法としては、試験片(10mm四方、厚さ6mmの樹脂板)を上記動的粘弾性装置に固定し、圧縮条件として周波数1Hz、温度23℃のときの貯蔵弾性率、損失弾性率を測定し、損失正接を算出した。
図3は、発泡成形体202における空隙部202cのサイズ分布を表すグラフである。
図3においては、縦軸に空隙部202cの個数、横軸に空隙部202cのサイズを示す。
試験片の断面をマイクロスコープにて観察し、空隙部202cの断面積を測定した(n=40)。
図3に示すように、空隙部202cのサイズの最頻値は、0.01mm2~0.1mm2であった。また、その中での平均値は0.025mm2であった。
(1)把持部21の握り込みやすさ(手へのフィット感)
[試験方法]
10人のモニターが歯ブラシ1を把持してブラッシングすることで、各実施例の歯ブラシ1で「把持部21の握りこみやすさ(手へのフィット感)」について評価した。
評価は、1点~7点の7段階絶対評価とされている。10人のモニターの平均点を下記判定基準に分類し、把持部21の握りこみやすさを判定した。
<判定基準>
☆:平均点が6.6点以上
◎:平均点が5.5以上6.5点未満
○:平均点が4.6点以上5.5点未満
△:平均点が3.6点以上4.5点未満
×:平均点が3.5点未満
[試験方法]
10人のモニターが歯ブラシ1を把持してブラッシングすることで、各実施例の歯ブラシで「把持部の変形速度」について評価した。
評価は、1点~7点の7段階絶対評価とされている。10人のモニターの平均点を下記判定基準に分類し、把持部21の変形速度(変形具合)を判定した。
<判定基準>
☆:平均点が6.6点以上
◎:平均点が5.5以上6.5点未満
○:平均点が4.6点以上5.5点未満
△:平均点が3.6点以上4.5点未満
×:平均点が3.5点未満
[試験方法]
10人のモニターが歯ブラシ1を把持してブラッシングすることで、各実施例の歯ブラシで「ブラッシングのしやすさ」について評価した。
評価は、1点~7点の7段階絶対評価とされている。10人のモニターの平均点を下記判定基準に分類し、ブラッシングのしやすさを判定した。
<判定基準>
☆:平均点が6.6点以上
◎:平均点が5.5以上6.5点未満
○:平均点が4.6点以上5.5点未満
△:平均点が3.6点以上4.5点未満
×:平均点が3.5点未満
実施例15のサンプル仕様が、ベストモードと言える。
Claims (12)
- 中心線に沿って長さを有する把持部と、前記把持部の先端から延設されたネック部と、前記ネック部の前記把持部とは反対側に設けられたヘッド部と、を有する歯ブラシ本体と、前記ヘッド部に植設された複数の毛束からなるブラシ部と、を備え、
前記歯ブラシ本体は、
把持部本体、前記ネック部及び前記ヘッド部を有する硬質樹脂からなるベース部材と、
前記把持部本体の表面に設けられ軟質樹脂からなる発泡成形体と、を有し、
前記発泡成形体は、充填部と、複数の空隙部と、を有し、
前記発泡成形体の貯蔵弾性率G’が、104Pa以上106.5Pa以下である、
歯ブラシ。 - 前記発泡成形体の損失弾性率G’’が、104Pa以上106.5Pa以下である、
請求項1に記載の歯ブラシ。 - 前記軟質樹脂の損失正接(損失弾性率G’’÷貯蔵弾性率G’)が、0.05以上である、
請求項1または2に記載の歯ブラシ。 - 前記軟質樹脂のショアA硬度が、30未満である、
請求項1から3のいずれか1項に記載の歯ブラシ。 - 前記複数の空隙部におけるサイズの最頻値が、0.001mm2以上、0.3mm2以下の範囲内である、
請求項1から4のいずれか1項に記載の歯ブラシ。 - 前記発泡成形体内における全ての前記空隙部のうちの80%の個数が、全ての前記空隙部のサイズの最頻値に対して、±0.3mm2の範囲内にある、
請求項1から5のいずれか1項に記載の歯ブラシ。 - 前記中心線に交差する前記発泡成形体の断面において、前記複数の空隙部の占有割合の平均値は、2%以上、60%以下の範囲内である、
請求項1から6のいずれか1項に記載の歯ブラシ。 - 前記軟質樹脂の密度が、0.55g/cm3以上、0.8g/cm3以下の範囲内である、
請求項1から7のいずれか1項に記載の歯ブラシ。 - 前記中心線に交差する前記把持部の断面は、前記ベース部材及び前記発泡成形体からなり、
前記ベース部材の断面積と、前記発泡成形体の断面積とを合計した総面積に対して、前記発泡成形体の断面積の割合が、50%未満である、
請求項1から8のいずれか1項に記載の歯ブラシ。 - 前記発泡成形体の厚みが、2mm以上、5mm以下である、
請求項7項に記載の歯ブラシ。 - 前記把持部は、
当該把持部の表面を形成するスキン層と、
前記充填部と前記複数の空隙部とが前記スキン層によって覆われた発泡層と、を有し、
前記中心線に交差する断面における前記スキン層と前記発泡層との厚みの比が、1:1以上、1:10以下の範囲内である、
請求項1から10のいずれか1項に記載の歯ブラシ。 - 前記把持部の長さ方向全体において前記発泡成形体が形成される割合は、50%以上、100%以下の範囲内である、
請求項1から11のいずれか1項に記載の歯ブラシ。
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5877538U (ja) * | 1981-11-20 | 1983-05-25 | ライオン株式会社 | 歯ブラシ |
JP2005287940A (ja) * | 2004-04-02 | 2005-10-20 | Lion Corp | 歯ブラシ |
JP2012121975A (ja) * | 2010-12-07 | 2012-06-28 | Kaneka Corp | 射出発泡成形用ポリプロピレン系樹脂、およびその射出発泡成形体 |
JP2017000407A (ja) * | 2015-06-10 | 2017-01-05 | ライオン株式会社 | 歯ブラシ |
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CN107708480A (zh) | 2015-06-24 | 2018-02-16 | 狮王株式会社 | 牙刷 |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5877538U (ja) * | 1981-11-20 | 1983-05-25 | ライオン株式会社 | 歯ブラシ |
JP2005287940A (ja) * | 2004-04-02 | 2005-10-20 | Lion Corp | 歯ブラシ |
JP2012121975A (ja) * | 2010-12-07 | 2012-06-28 | Kaneka Corp | 射出発泡成形用ポリプロピレン系樹脂、およびその射出発泡成形体 |
JP2017000407A (ja) * | 2015-06-10 | 2017-01-05 | ライオン株式会社 | 歯ブラシ |
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