JP2018019876A - toothbrush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toothbrush that excels in retention and dispersibility of formulation on the brush and that can materialize satisfactory foaming.SOLUTION: The toothbrush has a handle body with a head part 4 provided in the tip end and, in a plurality of implantation holes formed in the implantation surface 5 of the head part, bundles of bristles are implanted. The implantation surface includes: a central implantation region in which a plurality of central bristle bundles 12 are implanted that are provided in parallel in the axial line direction of the handle body and roughly in the center in the width direction orthogonal to the axial line; and an outer implantation region in which a plurality of outer bristle bundles 22 are implanted in the width direction across the central bristle bundles. The central bristle bundles are composed of tip end branched bristles that have a tip end branch part in the tip end of the shank. The value shown by the maximum diameter width of the tip end branch part 12B in the central bristles/the bristle branch diameter formed in the shank in the proximal end part 12A of the central bristle bundles is in excess of 1.0 and not more than 2.0. The implantation density which is the total number of bristles constituting the tip end branch part divided by the area of the central implantation region is not less than 1,000 bristles/cmand not more than 5,000 bristles/cm.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a toothbrush.

  For example, to prevent and improve periodontal disease, it is important to spread a sufficient amount of oral preparation in the oral cavity. For this purpose, it is necessary to improve the dispersibility of the preparation at the time of brushing and realize good foaming.

  Patent Document 1 discloses a toothbrush capable of shortening the bristles at the center to form a recess and holding a dentifrice in the recess. Moreover, as a toothbrush excellent in foaming, the technique (refer patent document 2) which restrict | limits the number of the hair which comprises one hair | bristle bundle, a high-density flocking area | region is arrange | positioned in the center part of a flocking surface, and low-density flocking around that A technique (see Patent Document 3) for arranging regions is disclosed.

JP 2011-4905 A JP 2003-250632 A JP 2013-42776 A

However, the following problems exist in the conventional technology as described above.
In the case of a toothbrush composed of round bristles or tapered bristles that are usually used for toothbrushes, there is a problem that the dispersibility is reduced by clogging the preparation between the bristles. In addition, since the preparation is clogged between the hair bundles, the preparation extruded onto the brush cannot be fully utilized, and foaming cannot be said to be sufficient.

  The present invention has been made in consideration of the above points, and an object of the present invention is to provide a toothbrush that is excellent in retention and dispersibility of the preparation on the upper part of the brush and can realize good foaming.

According to the first aspect of the present invention, the toothbrush includes a handle body provided with a head portion at the tip, and a hair bundle of hairs is implanted in a plurality of flocked holes formed on the flocked surface of the head portion. The flocking surface is arranged in parallel in the axial direction of the handle body, a central flocking region in which a plurality of central flocks are flocked at the approximate center in the width direction orthogonal to the axis, and the central flock in the width direction An outer flocked region in which a plurality of outer hair bundles are planted across the core, and the central hair bundle is constituted by a tip branch hair having a tip branch portion at the tip of the trunk portion, A value represented by a maximum spanning width of the leading end branching portion / a hair bundle diameter formed by the body portion at a base portion of the central hair bundle exceeds 1.0 and is 2.0 or less, and the branching portion The flocking density obtained by dividing the total number of hairs constituting the hair by the area of the central flocking region is: 000 present / cm ² or more, the toothbrush is provided, characterized in that it is 5000 / cm ² or less.

  Further, in the toothbrush according to one aspect of the present invention, a value represented by the maximum length of the outer flocked region in the width direction / the maximum length of the central flocked region in the width direction is 1.0 or more. , 5.0 or less.

  In the toothbrush according to the aspect of the present invention, the maximum number of the outer hair bundles arranged in the width direction is 4 or more and 8 or less, and the number of the center hair bundles arranged in the width direction. Is 2 or more and 5 or less, and the diameter of the flocked hole in which the outer hair bundle is implanted is 1.4 mm or more and 2.0 mm or less, and the diameter of the flocked hole in which the central hair bundle is implanted is 1 0.0 mm or more and 1.5 mm or less.

  Moreover, the toothbrush which concerns on 1 aspect of the said invention WHEREIN: The said outer hair | bristle bundle is characterized by the length on the said flocked surface being longer than the length on the said flocked surface of the said center hair | bristle bundle.

  Moreover, the toothbrush which concerns on the one aspect | mode of the said invention WHEREIN: The bristle for which the diameter becomes small gradually is included in the said outer hair | bristle bundle, It is characterized by the above-mentioned.

  Moreover, in the toothbrush according to the aspect of the present invention, the maximum length of all the flocked regions in which the plurality of central hair bundles and the plurality of outer hair bundles are planted in the width direction is 9.0 mm or more, 15. It is 0 mm or less.

  In the present invention, it is possible to provide a toothbrush that is excellent in retention and dispersibility of the preparation on the upper part of the brush and can realize good foaming.

It is a top view which shows the head part of the toothbrush concerning one Embodiment of this invention. It is AA sectional view taken on the line of the head part of the toothbrush 1 shown in FIG. It is a cross-sectional view of the trunk portion 13A of the central hair 13. It is a schematic block diagram of the front-end | tip part of a center hair | bristle bundle.

Hereinafter, embodiments of the toothbrush of the present invention will be described with reference to FIGS. 1 to 4.
The following embodiments show one aspect of the present invention and do not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each configuration easy to understand, the actual structure is different from the scale and number of each structure.

  The toothbrush of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a head portion 11 of a toothbrush 1 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in the head portion 11 of the toothbrush 1 shown in FIG. .

  As shown in FIG. 1, the toothbrush 1 includes a handle body 2, and the handle body 2 includes a long grip portion (not shown) and a head portion 4 provided at the tip of the grip portion. It is comprised roughly by. In FIG. 1, symbol O is an axis of the handle body 2, that is, a line passing through the center of the handle body 2 in the length direction of the handle body 2.

  The head portion 4 has a substantially rectangular shape in plan view with the axis O direction as a longitudinal direction, and an arbitrary surface is a flocking surface 5 for flocking hair bundles. A plurality of central flocking holes 10 having a bottomed cylindrical shape in FIG. 1 (12 in FIG. 1 as an example) are formed on the flocked surface 5 along and along the axis O. The plurality of central flocking holes 10 are arranged in a zigzag pattern in which the positions of the adjacent central flocking holes 10 in the axis O direction are shifted in the width direction of the head portion 4 which is a direction orthogonal to the axis O direction. Central hair bundles 12 in which a plurality of central bristles 13 are bundled in a substantially cylindrical shape are respectively implanted in the plurality of central flock holes 10 to form a central hair bundle group 14.

  As shown in FIG. 2, the central bristles 13 are composed of columnar body portions 13 </ b> A and tip branch hairs having tip branch portions 13 </ b> B at the ends of the body portions. The tip branching portion 13B is branched into a plurality (for example, 2 to 8) from the tip of the base portion 13A. As the branched hair, a conventionally known hair can be used, for example, a feather hair obtained by cutting the tip of a hollow filament, or a tapered branched hair whose diameter decreases as each branched portion approaches the tip. Among them, feather hair is preferred.

  FIG. 3 shows an example in which the center hair 13 is a feather hair. FIG. 3 is a cross-sectional view of the trunk portion 13A of the center hair 13. As shown in FIG. 3, the trunk portion 13A has a plurality (four in FIG. 3) of hollow portions 13C extending in the length direction. Two or more tip branch portions 13B are formed by cutting the tip of the body portion 13A. Examples of the feather hair include those described in JP-A-2005-131059.

  FIG. 4 is a schematic configuration diagram of the distal end portion of the central hair bundle 12 having the central hair 13 described above. As shown in FIG. 4, the center hair bundle 12 includes a base portion 12 </ b> A formed by base portions 13 </ b> A of a plurality of center hairs 13, and a branch portion 12 </ b> B formed by expanding branch portions 13 </ b> B of the plurality of center hairs 13. Including. The value represented by W1 / W2 is preferably more than 1.0 and not more than 2.0, where W1 is the maximum distal end width of the branch portion 12B and W2 is the diameter of the base portion 12A. When the value represented by W1 / W2 is 1.0 or less, the formulation is easily clogged between the central hair bundles 12 because the area of the branch portion 12B holding the formulation is small. On the other hand, when the value represented by W1 / W2 exceeds 2.0, the overlapping of the branch portions 12B increases, and the overlapped portion tends to be clogged. Therefore, when the value represented by W1 / W2 exceeds 1.0 and is 2.0 or less, clogging of the preparation can be suppressed and the preparation can be effectively used.

  The length L1 of the branch part 12B is preferably 1.5 mm or more and 2.5 mm or less. The length L1 of the branch part 12B is preferably 12% or more and 35% or less of the bristle length (distance from the flocked surface 5 to the tip of the branch part 12B) L2 of the central hair bundle 12. If the length L1 of the branching portion 12B is less than 12%, the value represented by W1 / W2 described above does not easily exceed 1.0, and the ratio of the base portion 13A having a large strength is large, so that the gums and the cervix There is a possibility that the contact with the part etc. becomes too strong. On the other hand, when the length L1 of the branching portion 12B exceeds 35%, the ratio of the base portion 12A becomes small, so that the waist as the central hair bundle 12 becomes too low, and the cleaning performance of the tooth neck portion becomes low, Since the actual feeling when the head part 4 enters the tooth neck part becomes dilute, the length L1 of the branch part 12B is preferably 12% or more and 35% or less of the bristle length L2 of the central hair 12.

  The flocked surface 5 has a plurality of outer flocked holes 20 that surround the central flocked hole 10 in the width direction and the lengthwise direction and have a bottomed cylindrical shape (31 in FIG. 1 as an example) along the axis O. An outer hair bundle 22 formed by bundling a plurality of outer hairs 23 in a substantially columnar shape is implanted in the outer flock hole 20.

  Of the 31 outer hair bundles 22, 12 outer hair bundles 22 arranged between the side edge 6 of the head portion 4 and the central hair bundle 12 in the width direction are arranged on the flocked surface 5. An outer hair bundle group 24a is configured. The flocked surface 5 has twelve outer hair bundles 22 arranged between the side edge 7 of the head portion 4 and the central hair bundle 12 in the width direction among the 31 outer hair bundles 22. Two outer hair bundle groups 24b are formed. The plurality of outer flocking holes 20 are arranged in a staggered manner in which the positions of the outer flocking holes 20 adjacent in the axis O direction are shifted in the width direction of the head portion 4. Therefore, the plurality of outer hair bundles 22 are arranged in a staggered manner in which the positions of the outer hair bundles 22 adjacent in the axis O direction are shifted in the width direction of the head portion 4. The hair length, which is the length on the flocked surface 5 of the central hair bundle 12, is formed shorter than the hair length, which is the length on the flocked surface 5 of the outer hair bundle 22, by a height D. Accordingly, the head portion 4 is formed with a recess having a depth D surrounded by the outer hair bundle 22. Since the central hair bundle 12 has a hair length shorter than that of the outer hair bundle 22, a concave portion is formed, so that the retention and foamability of the preparation are improved.

  On the flocked surface 5, a central flocked region 11 indicating a region where the central hair bundle group 14 is provided is formed. The central flocking region 11 is a region surrounded by an annular line connecting the outer edges of the central flocking hole 10 in which the central flock 12 located on the outermost periphery of the central flock group 14 is planted. This annular line constitutes a common tangent line between adjacent central flock holes 10.

  On the flocked surface 5, a first outer flocked region 21 a indicating a region where the first outer hair bundle group 24 a is provided is formed. The first outer flocked region 21a is a region surrounded by an annular line connecting the outer edges of the outer flocked holes 20 in which the outer hair bundles 22 constituting the first outer hair bundle group 24a are planted. This annular line constitutes a common tangent line between the adjacent outer flock holes 20 in the first outer hair bundle group 24a.

  Moreover, the 2nd outer hair transplant area | region 21b which shows the area | region in which the 2nd outer side hair | bristle bundle group 24b was provided is formed in the flocked surface 5. As shown in FIG. The second outer flocked region 21b is a region surrounded by an annular line connecting the outer edges of the outer flocked holes 20 in which the outer hair bundles 22 constituting the second outer hair bundle group 24b are planted. This annular line constitutes a common tangent line between the adjacent outer flock holes 20 in the second outer hair bundle group 24b. The first outer flocked region 21a and the second outer flocked region 21b constitute an outer flocked region 21 in which a plurality of outer flocks 22 are flocked with the central hair bundle 12 sandwiched in the width direction of the head portion 4.

  The material of the handle body 2 can be determined in consideration of the rigidity and mechanical characteristics required for the toothbrush 1, and for example, by using a high-hardness resin having a flexural modulus (JIS K7203) in the range of 500 to 3000 MPa, the toothbrush 1 The required mechanical properties can be obtained. Examples of such high-hardness resins include polypropylene (PP), polyethylene terephthalate (PET), polycyclohexylenedimethylene terephthalate (PCT), polystyrene (PS), acrylonitrile butadiene styrene (ABS), and cellulose propionate (CP). ), Polyarylate, polycarbonate, acrylonitrile styrene (AS) and the like, and one or more of them can be used.

  The size of the head part 4 can be determined in consideration of the maximum lengths of the central flocked region 11 and the outer flocked region 21 in the width direction of the head unit 4, the operability in the oral cavity, and the like. For example, the width (maximum width) W is 11 mm or more, for example, 11 to 17 mm, and thickness T is 4 to 8 mm.

  The maximum length L in the width direction of the head portion 4 of all the flocked regions including the central flocked region 11 and the outer flocked region 21 is preferably 9.0 mm or greater and 15.0 mm or less. If the maximum length L of the entire flocked region is less than 9.0 mm, there is a possibility that sufficient cleaning cannot be performed. When the maximum length L of the entire flocked region is more than 15.0 mm, the resistance when the head portion 4 is advanced into the oral cavity is increased, and the operability may be lowered. When the maximum length L is 9.0 mm or more and 15.0 mm or less, it becomes possible to ensure sufficient cleaning power and operability.

  Sum of the maximum length of the outer flocked region 21 in the width direction of the head portion 4, that is, the maximum length of the first outer flocked region 21a in the width direction of the head portion 4 and the maximum length of the second outer flocked region 21b. Is divided by the maximum length of the central flocked region 11 in the width direction of the head portion 4 and is preferably 1.0 or more and 5.0 or less. When said value is less than 1.0, since the maximum length of the outer hair transplantation area | region 21 as a wall which forms the recessed part mentioned above is small, the retainability of a formulation may fall. On the other hand, when said value exceeds 5.0, since the width | variety of the recessed part mentioned above is short, there exists a possibility that the dispersibility of a formulation may be missing. Therefore, if the value obtained by dividing the maximum length of the outer flocked region 21 in the width direction by the maximum length of the central flocked region 11 is 1.0 or more and 5.0 or less, excellent retention and dispersibility with respect to the preparation can be obtained. Can be secured.

  In order to ensure the retention and dispersibility of the preparation as described above, the maximum number of outer hair bundles 22 arranged in the width direction is preferably 4 or more and 8 or less, and the center arranged in the width direction is the center. The number of hair bundles 12 is preferably 2 or more and 5 or less. Further, the diameter of the outer flock hole 20, that is, the diameter of the cross section perpendicular to the length direction of the outer follicle bundle 22 is preferably 1.4 mm or more and 2.0 mm or less, and the diameter of the central flock hole 10, The diameter of the cross section perpendicular to the length direction of the central hair bundle 12 is preferably 1.0 mm or more and 1.5 mm or less.

  When the hair bundle diameter of the outer hair bundle 22 is less than 1.4 mm, the hair bundle becomes too soft and the cleaning effect is lowered. When the hair bundle diameter of the outer hair bundle 22 exceeds 2.0 mm, especially when the head portion 4 is widened, the interference of the outer hair bundle 22 becomes large and the hair does not bend. For this reason, the hair ends of the outer hair bundle 22 are less likely to enter the interdental portion or the tooth neck portion, and the cleaning effect is reduced. Therefore, if the hair bundle diameter of the outer hair bundle 22 is 1.4 mm or more and 2.0 mm or less, the hair bundle does not become too soft, and the hair tip easily enters the interdental part or the neck part. It becomes possible to ensure the cleaning effect.

  When the hair bundle diameter of the center hair bundle 12 is less than 1.0 mm, the hair of the center hair bundle 12 becomes too low, and the retention of the preparation becomes low. When the hair bundle diameter of the center hair bundle 12 exceeds 1.5 mm, the entanglement between the branch portions increases, and the dispersibility may be lowered. Accordingly, when the hair bundle diameter of the central hair bundle 12 is 1.0 mm or more and 1.5 mm or less, it is possible to ensure the retainability and dispersibility of the preparation.

The flocking density of the branched portion (branched hair) 12B in the central hair bundle group 14, that is, the total number of the branched portions (branched hair) 12B in the central hair bundle 12 constituting the central hair bundle group 14 is the area of the central flocked region 11. The divided value (central flocking density) is preferably 1000 / cm ² or more and 5000 / cm ² or less. If the flocking density of the branched part (branched hair) 12B is less than 1000 / cm ² , the branching may be insufficient due to insufficient branching, and the flocked density of the branched part (branched hair) 12B is 5,000. When it exceeds / cm ² , there are too many branched hairs and the stirring force will be lost, and foaming may be insufficient. If the flocking density of the branched portion (branched hair) 12B is 1000 / cm ² or more and 5000 / cm ² or less, the dispersibility is excellent and good foaming can be achieved. Moreover, even if the flocking density of the branch part (branch hair) 12B is in the above range, the flocking density of the base part 12A is smaller and easier to move, so that the tooth surface and the like can be firmly polished.

  The outer hair 23 is ST hair (super tapered hair) having a tapered tip. The hair diameter of the outer hair 23 can be determined in consideration of the material of the outer hair 23, and is, for example, 6 to 9 mil (1 mil = 1/1000 inch = 0.025 mm). If it is 6 mils or more, the fur waist which can clean a tooth neck part well is ensured, and if it is 9 mils or less, the softness | flexibility which can relieve irritation | stimulation to a gum etc. is ensured. In addition, the bristle diameter in ST hair is a diameter in a base part.

As described above, according to the present embodiment, the central hair bundle 12 has the branch portion 12B, and the value represented by the maximum width W1 of the branch portion 12B1 / the diameter W2 of the base portion 12A is 1 Since it exceeds 0.0 and is 2.0 or less, it is possible to suppress clogging of the preparation and contribute to effective use of the preparation. Further, according to this embodiment, flocking density the total number was divided by the area of the central bristle region 11 of the branch portion 12B is, for 1000 / cm ² or more and 5000 / cm ² or less is excellent in dispersibility , Good foaming can be achieved.

  According to this embodiment, since the value obtained by dividing the maximum length of the outer flocked region 21 in the width direction by the maximum length of the central flocked region 11 is 1.0 or more and 5.0 or less, the formulation has excellent retention. And dispersibility can be ensured. According to this embodiment, since the hair bundle diameter of the outer hair bundle 22 is 1.4 mm or more and 2.0 mm or less, the hair bundle is not too soft and easily enters the interdental tooth neck, The cleaning effect is enhanced. According to this embodiment, since the hair | bristle bundle diameter of the center hair | bristle bundle 12 is 1.0 mm or more and 1.5 mm or less, it becomes possible to ensure the retainability and dispersibility of a formulation.

  According to this embodiment, since the length of the outer hair bundle 22 on the flocked surface 5 is longer than the length of the central hair bundle 12 on the flocked surface 5, the outer hair bundle 22 is surrounded by the outer hair bundle 22 on the central hair bundle 12. A recessed part can be formed and the retainability and foaming property of a formulation can be improved. According to this embodiment, since the outer hair 23 is ST hair (supertapered hair), it is possible to improve the cleaning feeling on the tooth neck.

The present invention is not limited to the above-described embodiment. In the above-described embodiment, the central hair bundle 12 has a substantially cylindrical shape, but may be, for example, an elliptical columnar shape in a plan view, or a polygonal column shape such as a triangular shape, a quadrangle, or a pentagon in a plan view. In addition, when the shape of the center hair | bristle bundle 12 is made into shapes other than a substantially cylindrical shape, the hair | bristle bundle diameter is made into the diameter of the perfect circle which circumscribes the shape of planar view.
Further, the outer hair bundle 22 may have an elliptical columnar shape in a plan view as in the case of the central hair bundle 12, or may have a polygonal column shape such as a triangular shape, a quadrangle, or a pentagon in a plan view.

  In the above-described embodiment, the central flocking hole 10 has a bottomed cylindrical shape, but the shape of the central flocking hole 10 can be determined according to the shape of the central flock 12, for example, the central flocking hole 10 is viewed in plan view. It may be an elliptical bottomed cylindrical shape, or may be a bottomed polygonal cylindrical shape such as a triangle, a quadrangle, or a pentagon in plan view. Further, the outer flocking hole 20 may have a bottomed cylindrical shape with a plan view elliptical shape, or a bottomed polygonal cylindrical shape with a triangular shape, a quadrangle, a pentagon, etc. in a plan view, as with the central flocking hole 10.

  In the above-described embodiment, the diameters of all the central flock holes 10 are substantially the same. However, the present invention is not limited to this, and the diameters of all the central flock holes 10 may be different from each other. The diameters of some central flock holes 10 may be different from the diameters of other central flock holes 10. Moreover, in the above-mentioned embodiment, although the diameter of all the outer flock holes 20 is made substantially equivalent, this invention is not limited to this, Even if the diameter of all the outer flock holes 20 is mutually different. The diameters of some outer flock holes 20 may be different from the diameters of other outer flock holes 20.

  In the above-described embodiment, the outer hairs 23 are ST hairs, but the present invention is not limited to this. For example, the outer hairs 23 may have a uniform diameter over the length direction. However, the tip may be a hemispherical surface or a surface parallel to the flocked surface. However, from the viewpoint of facilitating entry into the periodontal pocket or interdental portion, it is preferable that some of the outer hairs 23 of the outer hair bundle 22 are ST hairs or tapered hairs. More preferably, the hair 23 is ST hair or tapered hair.

In the above-described embodiment, the hair length of the center hair bundle 12 is shorter than the hair length of the outer hair bundle 22. For example, the hair length of the center hair bundle 12 is the same as the hair length of the outer hair bundle 22. That is, the hair length difference may be 0 mm, and the hair length of the center hair bundle 12 may be longer than the hair length of the outer hair bundle 22. Further, even if the hair lengths of the central hair bundle 12 and the outer hair bundle 12 are set so that the shape of the ends of the main hair bundle is an uneven surface that repeats the peak and the valley in the axial direction of the handle body. Good.
However, it is preferable that the hair length of the central hair bundle 12 is shorter than the hair length of the outer hair bundle 22 from the viewpoint of enhancing the retention of the preparation.

  In the above-described embodiment, the central hair bundle group 14 is composed of twelve central hair bundles 12, but the number of central hair bundles 12 constituting the central hair bundle group 14 may be 11 or less, It may be 13 or more.

In the above-described embodiment, the first or second outer hair bundle group 24a, 24b is configured by twelve outer hair bundles 22, but for example, the first or second outer hair bundle group 24a, 24b. 11 or less may be sufficient as the outer hair | bristle bundle 22 which comprises, and 13 or more may be sufficient as it.
Further, the number of the outer hair bundles 22 constituting the first outer hair bundle group 24a and the number of the outer hair bundles 22 constituting the second outer hair bundle group 24b may be the same or different. May be.

(Evaluation method)
The toothbrush of each example was evaluated for the “dispersibility of the formulation”, “foaming”, “retention property of the formulation”, and “feeling of cleaning the tooth neck” by the following methods.

<Evaluation of dispersibility of the preparation>
The dispersibility of the preparation was evaluated by a sensory test using 10 expert panels. After 1 g of a commercially available dentifrice was placed on the toothbrushes shown in each Example and Comparative Example and brushing was performed for 3 minutes and 0 minutes, the amount of the dentifrice remaining on the toothbrush was evaluated according to the following evaluation criteria. The average score of 10 expert panels is 3.5 or more and 4.0 or less is “◎”, the average score is 3.0 or more, and less than 3.5 is “◯”, and the average score is 2.0. A toothbrush that has good dispersibility and has a dispersibility of ◎ or ◯, where “Δ” is an average score of less than 3.0 and “×” is an average score of less than 2.0. It was judged.

≪Evaluation criteria≫
4 points: No dentifrice remains between the bristles of the toothbrush.
3 points: Dentifrice remains between the bristles of the toothbrush, but spans 1 to 2 bristles.
2 points: Dentifrice remains between 3 to 4 hair bundles.
1 point: Dentifrice remains over 5 hair bundles.

<Evaluation of foaming>
Foaming was evaluated by a sensory test using 10 expert panels. Foaming in the oral cavity was evaluated according to the following evaluation criteria when 1 g of a commercially available dentifrice was placed on the toothbrush shown in each Example and Comparative Example and brushed for 3 minutes. The average score of 10 expert panels is 3.5 or more and 4.0 or less is “◎”, the average score is 3.0 or more, and less than 3.5 is “◯”, and the average score is 2.0. A toothbrush with good foaming at the time of toothbrushing, where △ and ○ foaming is ensured, with a score of △ and a score of less than 3.0 and an average score of less than 2.0 is “x”. It was judged.

≪Evaluation criteria≫
4 points: Foam well
3 points: foam
2 points: Slightly foaming 1 point: No foaming at all

<Evaluation of formulation retention>
1 g of the dentifrice was placed on the flocked portion of the toothbrush, and the plastic plate was scraped for 90 seconds with the flocked portion on which the dentifrice was placed (load: 200 g, speed: 160 strokes / min). Thereafter, the mass of the toothbrush before 1 g of the dentifrice is tared, the mass of the toothbrush after the scrubbing is measured, and the mass (residual amount) of the dentifrice remaining in the flocked portion is obtained. ) To determine the residual rate. The obtained residual ratio was classified into the following evaluation criteria to evaluate the retention of the preparation.
Residual rate (mass%) = residual amount (g) ÷ 1 g × 100 (i)

≪Evaluation criteria≫
A: Residual rate is 30% or more. B: Residual rate is 20% by mass or more and less than 30% by mass.
(Triangle | delta): A residual rate is 15 to 20 mass%.
X: Remaining rate is less than 15 mass%.

<Evaluation of dental neck cleaning feeling>
Tooth neck cleaning actual feeling was evaluated by a sensory test using 10 expert panels. The tooth neck cleaning actual feeling of the toothbrush shown in each example and comparative example was evaluated according to the following evaluation criteria. The average score of 10 expert panels is 3.5 or more and 4.0 or less is “◎”, the average score is 3.0 or more, and less than 3.5 is “◯”, and the average score is 2.0. △ and ○ with an average score of less than 2.0 and an average score of less than 2.0 are marked with “X”. The toothbrush was judged to have a cleaning feeling. In addition, about the tooth neck part cleaning actual feeling, it evaluated only when the outer side hair | bristle bundle 22 is ST hair (Example 10 and Comparative Example 5).

≪Evaluation criteria≫
4 points: I feel the feeling that the dirt in the gap between the teeth and gums has been removed.
3 points: Feels that the dirt in the gap between the teeth and gums has been removed.
2 points: The feeling that the dirt in the gap between the teeth and gums was removed does not feel much.
1 point: There is no feel that the dirt in the gap between the teeth and gums has been removed.

(Examples 1-10, Comparative Examples 1-5)
In accordance with the specifications shown in Tables 1 to 3, similar to the toothbrush 1 in FIG. 1, the central hair bundle (shown by ●) was planted in the central flocked region, and the outer hair bundle (shown by ○) was planted in the outer flocked region. A toothbrush was prepared. In the table, the “tip width” is the maximum tip width W1 of the branch portion 12B of the central hair bundle 12. About the obtained toothbrush of each example, "dispersibility of formulation", "foaming", "retention property of formulation", and "feeling of tooth neck cleaning" were evaluated.

  As shown in Table 1 and Table 2, in each of Examples 1 to 10 to which the present invention was applied, the evaluation of the dispersibility, foaming, and retention of the preparation was “」 ”or“ ◯ ”. Moreover, about Example 10, evaluation of the dental neck cleaning actual feeling was "(double-circle)".

  On the other hand, as shown in Table 3, in Comparative Example 1 in which the value of the outer flocking width / central flocking width was 0.4, the evaluation of foaming was “◎” although the evaluation of the dispersibility of the preparation was “「 ”. “△”, the evaluation of the retention of the preparation was “x”.

  In Comparative Example 2 in which the value of the outer flocking width / center flocking width was 6.1, the evaluation of the retention of the preparation was “◯ to ◎”, but the evaluation of foaming was “Δ”, and the dispersibility of the preparation Was evaluated as “×”.

The value of the tip width (oblique or transverse direction) W1 / base diameter (center flock hole diameter) W2 is 0.92, the tip width (vertical direction) W1 / base diameter (center flock hole diameter) W2 is In Comparative Example 3 in which the tip flocking density was 792 / cm ² in the case of 0.55, the evaluation of foaming was “X”, while the evaluation of the retention of the preparation was “◯ to ◎”. The evaluation of dispersibility was “x”.

The value of the tip width (oblique or transverse direction) W1 / base diameter (center flock hole diameter) W2 is 2.32, the tip width (vertical direction) W1 / base diameter (center flock hole diameter) W2 is In Comparative Example 4 in which the tip flocking density was 9503 / cm ² , the evaluation of the retention of the preparation was “◯ to ◎”, but the evaluation of foaming was “×”. The evaluation of dispersibility was “x”.

  In Comparative Example 5 in which the hair length of the central hair bundle is longer than the hair length of the outer hair bundle, although the evaluation of the dispersibility of the preparation is “◎”, the evaluation of foaming is “Δ to ○”, and the evaluation of the retention of the preparation Was evaluated as “×”, and the evaluation of the actual feeling of cleaning the tooth neck was “×”.

  From these results, it was found that by applying the present invention, a toothbrush satisfying all of the retention and dispersibility of the preparation, foaming, and the actual feeling of cleaning the tooth neck can be obtained.

  As described above, the preferred embodiments according to the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the examples. Various shapes, combinations, and the like of the constituent members shown in the above-described examples are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Toothbrush, 2 ... Handle body, 4 ... Head part, 5 ... Flocking surface, 10 ... Central flocking hole, 11 ... Central flocking area | region, 12 ... Central flock, 12A ... Base part, 12B ... Branch part, 13 ... For center Bristles, 20 ... outside flocking holes, 21 ... outside flocking regions, 22 ... outside bristles, 23 ... outside bristles

Claims (6)

In a toothbrush comprising a handle body provided with a head part at the tip, and a bristles of hairs implanted in a plurality of flock holes formed on the flocked surface of the head part,
The flocked surface is arranged in parallel in the axial direction of the handle body and a central flocking region in which a plurality of central hair bundles are flocked at a substantially center in the width direction perpendicular to the axial line,
An outer hair transplantation region in which a plurality of outer hair bundles are planted across the central hair bundle in the width direction;
The central hair bundle is composed of a tip branch hair having a tip branch portion at the tip of the trunk portion,
The value represented by the maximum width of the tip branching portion in the central hair bundle / the diameter of the hair bundle formed by the body portion at the base of the central hair bundle exceeds 1.0 and is 2.0 or less. Yes,
The flocking density the total number of use hair was divided by the area of the central bristle region constituting the bifurcation, 1000 / cm ² or more, toothbrush, characterized in that it is 5000 / cm ² or less.   The value represented by the maximum length of the outer flocked region in the width direction / the maximum length of the central flocked region in the width direction is 1.0 or more and 5.0 or less. Item 1. A toothbrush according to Item 1. The maximum number of the outer hair bundles arranged in the width direction is 4 or more and 8 or less,
The number of the central hair bundles arranged in the width direction is 2 or more and 5 or less, and the diameter of the flock hole in which the outer hair bundle is planted is 1.4 mm or more and 2.0 mm or less,
The toothbrush according to claim 1 or 2, wherein a diameter of a flock hole in which the central bristles are flocked is 1.0 mm or more and 1.5 mm or less.   The toothbrush according to any one of claims 1 to 3, wherein the outer hair bundle has a length on the flocked surface that is longer than a length on the flocked surface of the central hair bundle.   The toothbrush according to any one of claims 1 to 4, wherein the outer bristle bundle includes a bristle whose diameter gradually decreases toward the bristle tip.   The maximum length of the entire flocked region in which the plurality of central hair bundles and the plurality of outer hair bundles are planted in the width direction is 9.0 mm or more and 15.0 mm or less. The toothbrush according to any one of 5.

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