KR102539341B1 - toothbrush - Google Patents

Abstract

An object of the present invention is to provide a toothbrush that is excellent in retention and dispersibility of a formulation on the top of a brush and can realize good foam generation. In the toothbrush having a handle body having a head portion 4 formed at the front end and having hair bundles implanted in a plurality of hair transplant holes formed on the hair transplant surface 5 of the head portion, the hair transplant surfaces are arranged in parallel in the axial direction of the handle body It has a central tufted area in which a plurality of central hair bundles 12 are planted approximately at the center in the width direction orthogonal to the axis line, and an outer tufted area in which a plurality of outer hair bundles 22 are planted between the central hair bundles 22 in the width direction. . The central hair bundle is composed of tip branch hairs having a tip branch at the tip of the trunk. The value represented by the maximum diameter width of the tip branch portion 12B in the central hair bundle/the diameter of the hair bundle formed in the trunk portion in the base portion 12A of the central hair bundle exceeds 1.0 and is 2.0 or less. The hair transplant density obtained by dividing the total number of hairs constituting the tip branch by the area of the central hair follicle region is 1000 hairs/cm 2 or more and 5000 hairs/cm 2 or less.

Description

toothbrush

The present invention relates to a toothbrush.

This application claims priority based on Japanese Patent Application No. 2016-152499 for which it applied to Japan on August 3, 2016, and uses the content here.

For example, it is important to widely spread a sufficient amount of oral preparations in the oral cavity for prevention and improvement of periodontal disease. For that purpose, it is necessary to improve the dispersibility of the preparation during tooth brushing and to realize good foaming.

Patent Literature 1 discloses a toothbrush capable of shortening the hair bundle in the central portion to form a concave portion and holding a dentifrice in the concave portion. In addition, as a toothbrush with excellent foam generation, a technique of limiting the number of hairs constituting one hair bundle (see Patent Document 2), a technique of arranging a high-density hair-flocking area in the center of the tufted surface and arranging a low-density tufting area around it (See Patent Literature 3) is disclosed.

Japanese Unexamined Patent Publication No. 2011-4905 Japanese Unexamined Patent Publication No. 2003-250632 Japanese Unexamined Patent Publication No. 2013-42776

However, the prior art as described above has the following problems.

In the case of toothbrushes composed of round bristles or tapered bristles commonly used in toothbrushes, there is a problem in that the dispersibility is lowered due to the accumulation of the agent between the hair bundles. In addition, the agent extruded on the brush cannot be sufficiently utilized due to the accumulation of the agent on the hair bundle, and it cannot be said that it is sufficient for foam generation.

The present invention has been made in view 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 formulation on the top of the brush and can realize good foaming.

According to the first embodiment of the present invention, in the toothbrush having a handle body having a head portion formed at the front end and having hair bundles implanted in a plurality of hair transplant holes formed on the hair transplant surface of the head portion, the hair transplant surface is A central tufted area in which a plurality of central hair bundles are planted at substantially the center in the width direction juxtaposed in the axial direction of the handle body and orthogonal to the axis line, and an outer side in which a plurality of outer hair bundles are planted between the central hair bundles in the width direction It has a hair transplant region, and the central hair bundle is composed of tip branch hairs having a tip branch at the tip of the body, and the maximum diameter width of the tip branch in the central hair bundle / the trunk in the base portion of the central hair bundle The value represented by the diameter of the hair bundle formed in the portion is greater than 1.0 and less than or equal to 2.0, and the hair transplant density obtained by dividing the total number of hair constituting the branch portion by the area of the central hair transplant region is 1000 hairs/cm 2 or more and 5000 hairs. A toothbrush characterized in that / cm 2 or less is provided.

In addition, in the toothbrush according to one embodiment of the present invention, the value represented by the maximum length of the outer hairy region in the width direction / the maximum length of the center hairy region in the width direction is 1.0 or more, 5.0 It is characterized by the following.

In addition, in the toothbrush according to an embodiment 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 central hair bundles arranged in the width direction is 2 or more, 5 Below, the diameter of the tuft hole into which the outer hair bundle is planted is 1.4 mm or more and 2.0 mm or less, and the diameter of the tuft hole into which the central hair bundle is planted is 1.0 mm or more and 1.5 mm or less.

In addition, in the toothbrush according to an embodiment of the present invention, the outer hair bundles are characterized in that the length on the hair-transplantation surface is longer than the length of the central hair bundle on the hair-transplantation surface.

In addition, in the toothbrush according to one embodiment of the present invention, it is characterized in that the outer hair bundle includes hair whose diameter gradually decreases toward the tip of the hair.

In addition, in the toothbrush according to one embodiment of the present invention, the maximum length of the entire hair transplant region in which the plurality of central hair bundles and the plurality of outer hair bundles are transplanted in the width direction is 9.0 mm or more and 15.0 mm or less. to be characterized

In the present invention, it is possible to provide a toothbrush that is excellent in retention and dispersibility of the formulation on the top of the brush and can realize good foam generation.

1 is a plan view showing a head portion of a toothbrush according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view taken along the AA line in the head of the toothbrush 1 shown in Fig. 1 .
3 : is a cross-sectional view of 13 A of trunk parts in the hair 13 for center.
Figure 4 is a schematic configuration diagram of the front end of the central hair bundle.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the toothbrush of this invention is described with reference to FIGS. 1-4.

In addition, the following embodiment shows one embodiment of this invention, It does not limit this invention, It can change arbitrarily within the range of the technical idea of this invention. In the following drawings, the actual structure and the scale, number, etc. of each structure are different in order to make each structure easy to understand.

EMBODIMENT OF THE INVENTION The toothbrush of this invention is demonstrated with reference to drawings below. 1 is a plan view showing the head portion 11 of the toothbrush 1 according to one embodiment of the present invention, and FIG. 2 is a view from the line A-A in the head portion 11 of the toothbrush 1 shown in FIG. it is a cross section

As shown in FIG. 1, a toothbrush 1 is provided with a handle body 2, and the handle body 2 has a long gripping portion (not shown), and a head portion 4 formed at the tip of the gripping portion. ) is roughly composed of. In FIG. 1 , symbol O is the axis of the handle body 2, that is, the longitudinal direction of the handle body 2, and is a line passing through the center of the handle body 2.

The head portion 4 has a substantially rectangular shape when viewed from a plane with a length in the direction of the axis O, and an arbitrary surface becomes a hair transplant surface 5 for transplanting a hair bundle. On the tufted surface 5, along the axial line O and along the axial line O, in FIG. 1, not a through hole, but a bottomed cylindrical shape with a bottom having a plurality (12 as an example in FIG. 1) of central tufting holes 10 this is formed The plurality of central tufted holes 10 have a zigzag shape in which the positions of the central tufted holes 10 adjacent to each other in the direction of the axis O are displaced in the width direction of the head portion 4, which is a direction orthogonal to the direction of the axis O. are placed as Central hair bundles 12 that bundled a plurality of central hairs 13 in a substantially cylindrical shape are planted in the plurality of central hair holes 10, respectively, and the central hair bundles 14 are configured.

As shown in FIG. 2, the hair 13 for center is comprised by the tip branch hair which has 13 A of columnar trunk parts, and the tip branch part 13B at the tip of a trunk part. The tip branch portion 13B is branched from the tip of the base portion 13A into a plurality (for example, 2 to 8). As the branch hairs, conventionally known ones can be used, and examples thereof include feathered hairs obtained by cutting the tips of hollow filaments, or tapered branch hairs whose diameters are reduced as each branched portion faces the tip. Among them, a feathered appearance is preferable.

The central feature 13 shows an example of the feathered feature in FIG. 3 . 3 : is a cross-sectional view of 13 A of trunk parts in the hair 13 for center. As shown in Fig. 3, the body portion 13A has a plurality of (four in Fig. 3) hollow portions 13C extending in the longitudinal direction. Two or more tip branch portions 13B are formed by cutting the tip of the trunk portion 13A. As a feathered appearance, what was described in Unexamined-Japanese-Patent No. 2005-131059 etc. is mentioned, for example.

Figure 4 is a schematic configuration diagram of the front end of the central hair bundle (12) having the central yongmo (13). As shown in FIG. 4, the central hair bundle 12 has a base portion 12A formed of base portions 13A of the plurality of hairs 13 for central use, and a branched portion 13B of the plurality of hairs 13 for central use. It includes a branching portion 12B formed by widening. If W1 is the maximum diameter of the tip of the branched portion 12B and W2 is the diameter of the base portion 12A, the value represented by W1/W2 is preferably greater than 1.0 and less than or equal to 2.0. When the value represented by W1/W2 is 1.0 or less, the agent is easily accumulated between the central hair bundles 12 because the area of the branch portion 12B holding the agent is small. On the other hand, when the value represented by W1/W2 exceeds 2.0, the number of overlaps of the branched portion 12B increases, and the agent tends to accumulate in the overlapped portion. Therefore, when the value represented by W1/W2 exceeds 1.0 and is 2.0 or less, the accumulation of agents can be suppressed and the agents can be effectively utilized.

As length L1 of branch part 12B, it is preferable that they are 1.5 mm or more and 2.5 mm or less. The length L1 of the branching portion 12B is 12% or more and 35% or less of the hair length (distance from the hair transplant surface 5 to the tip of the branching portion 12B) L2 of the central hair bundle 12. desirable. When the length L1 of the branched portion 12B is less than 12%, the value represented by W1/W2 described above becomes difficult to exceed 1.0, and since the ratio of the strong base portion 13A is large, the gum or There is a possibility that the contact to the tooth cervical region or the like becomes too strong. On the other hand, when the length L1 of the branching portion 12B exceeds 35%, the hair waist as the central hair bundle 12 is too low in that the ratio of the base portion 12A is reduced, resulting in a decrease in the cleanability of the tooth neck area. , Since the feeling at the time of entering the head portion 4 into the tooth neck portion is thin, the length L1 of the branch portion 12B is 12% or more and 35% or less of the hair length L2 of the central hair 12 desirable.

In addition, on the tufted surface 5, a plurality of (31 as an example in FIG. 1) outer tufted holes 20 in a bottomed cylindrical shape surrounding the central tufted hole 10 in the width direction and the longitudinal direction and along the axis O. ) is formed, and an outer hair bundle 22 in which a plurality of outer side hairs 23 are bundled in a substantially cylindrical shape is implanted in this outer side hair hole 20.

On the hair transplant surface 5, among the 31 outer hair bundles 22, 12 outer hair bundles 22 disposed between the side edge 6 of the head portion 4 and the central hair bundle 12 in the width direction A first outer hair bundle 24a is constituted. In addition, on the hair transplant surface 5, 12 outer hair bundles 22 disposed 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 Thus, the second outer hair bundle group 24b is constituted. The plurality of outer tufted holes 20 are arranged in a zigzag shape in which the positions of the outer tufted holes 20 adjacent to each other in the direction of the axis line O are shifted in the width direction of the head portion 4 . Therefore, the plurality of outer hair bundles 22 are arranged in a zigzag shape in which the positions of the outer hair bundles 22 adjacent to each other in the direction of the axis line O are shifted in the width direction of the head portion 4. The hair length, which is the length on the hair transplant surface 5 of the central hair bundle 12, is shorter than the hair length, which is the length on the hair transplant surface 5 of the outer hair bundle 22, by a height (D). Therefore, the head portion 4 is formed with a concave portion having a depth D surrounded by the outer hair bundle 22 . Since the hair length of the central hair bundle 12 is shorter than the hair length of the outer hair bundle 22, the concave portion is formed, thereby improving the retention and foaming properties of the formulation.

On the hair-transplanted surface 5, a central hair-transplanted region 11 indicating a region in which the central hair bundle 14 is formed is formed. The central tufted region 11 is an area surrounded by a circular line connecting the outer edge of the central tufted hole 10 in which the central hair bundle 12 located at the outermost circumference of the central hair bundle group 14 is implanted. Moreover, this circulation line comprises the common tangential line of adjacent center tuft hole 10 comrades.

On the tufted surface 5, a first outer tufted region 21a is formed, indicating a region where the first outer hair bundle 24a is formed. The first outer tufted region 21a is an area surrounded by a circular line connecting the outer edge of the outer tufted hole 20 in which the outer hair bundle 22 constituting the first outer hair bundle 24a is implanted. In addition, this circular line constitutes a common tangential line between adjacent outer side hair holes 20 within the first outer side hair bundle group 24a.

Further, on the hair-transplanted surface 5, a second outer hair-tufted region 21b indicating a region in which the second outer hair bundle 24b is formed is formed. The second outer tufted region 21b is an area surrounded by a circular line connecting the outer edge of the outer tufted hole 20 in which the outer hair bundle 22 constituting the second outer hair bundle 24b is implanted. In addition, this circular line constitutes a common tangential line between the adjacent outer hair holes 20 within the second outer hair bundle group 24b. An outer-transplanted area in which a plurality of outer hair bundles 22 are planted by sandwiching the central hair bundle 12 in the width direction of the head portion 4 by the first outer-transplanted area 21a and the second outer-transplanted area 21b. (21) constitutes

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, a high-hardness resin having a bending elastic modulus (JIS K7203) in the range of 500 to 3000 MPa is used. By doing so, the mechanical properties required for the toothbrush 1 are obtained. Examples of such high-hardness resin include polypropylene (PP), polyethylene terephthalate (PET), polycyclohexylenedimethylene terephthalate (PCT), polystyrene (PS), acrylonitrile butadiene styrene (ABS), and cellulose pro. Cypionate (CP), polyarylate, polycarbonate, acrylonitrile styrene (AS), etc. can be mentioned, and these can be used 1 type or multiple types.

The size of the head portion 4 can be determined in consideration of the maximum length of the central hair transplant region 11 and the outer hair hair region 21 in the width direction of the head portion 4, or maneuverability in the oral cavity. For example, the width (maximum width) W is 11 mm or more, for example 11 to 17 mm, and the thickness T is 4 to 8 mm.

It is preferable that the maximum length L in the width direction of the head part 4 of the whole hair transplantation area|region including the central hair transplantation area 11 and the outer hair transplantation area 21 is 9.0 mm or more and 15.0 mm or less. There is a possibility that sufficient cleaning cannot be performed when the maximum length L of the entire hair transplant region is less than 9.0 mm. When the maximum length L of the entire hair transplant region is more than 15.0 mm, there is a possibility that the resistance at the time of entering the head portion 4 into the oral cavity increases, resulting in deterioration in operability. 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.

The maximum length of the outer hair transplant region 21 in the width direction of the head portion 4, that is, the maximum length of the first outer hair transplant region 21a in the width direction of the head portion 4, and the second outer hair transplant The value obtained by dividing the sum of the maximum lengths of the region 21b by the maximum length of the center hair region 11 in the width direction of the head 4 is preferably 1.0 or more and 5.0 or less. When the value is less than 1.0, the maximum length of the outer tufted region 21 as a wall forming the above-described concave portion is small, so the retention of the formulation may be reduced. On the other hand, when the value exceeds 5.0, the dispersibility of the formulation may be lacking because the width of the concave portion described above is short. Therefore, if the value obtained by dividing the maximum length of the outer tufted region 21 in the width direction by the maximum length of the central tufted region 11 is 1.0 or more and 5.0 or less, excellent retention and dispersibility of the formulation can be ensured.

As described above, in order to secure the retention and dispersibility of the formulation, the maximum number of outer hair bundles 22 arranged in the width direction is preferably 4 or more and 8 or less, and the number of central hair bundles 12 arranged in the width direction is preferably 2 or more and 5 or less. In addition, the diameter of the outer hair hole 20, that is, the diameter of the cross section perpendicular to the longitudinal direction of the outer hair bundle 22 is preferably 1.4 mm or more and 2.0 mm or less, and the diameter of the central hair hole 10, that is, the center It is preferable that the diameter of the cross section orthogonal to the longitudinal direction of the hair bundle 12 is 1.0 mm or more and 1.5 mm or less.

If 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 reduced. If the hair bundle diameter of the outer hair bundle 22 exceeds 2.0 mm, in particular, when the head portion 4 is widened, the interference of the outer hair bundle 22 is large, so that the hair does not bend. Therefore, it becomes difficult for the tip of the outer hair bundle 22 to enter the interdental or cervical region, and the cleaning effect is reduced. Therefore, when 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 tip of the hair easily enters the interdental or cervical region, so that a high cleaning effect can be ensured.

When the hair bundle diameter of the central hair bundle 12 is less than 1.0 mm, the hair waist as the central hair bundle 12 is too low, resulting in poor retention of the formulation. When the diameter of the hair bundle of the central hair bundle 12 exceeds 1.5 mm, there is a possibility that the entanglement of the branched portions increases and the dispersibility decreases. Therefore, when the hair bundle diameter of the central hair bundle 12 is 1.0 mm or more and 1.5 mm or less, it becomes possible to ensure the retention and dispersibility of the formulation.

The hair density of the branched part (branch hair) 12B in the central hair bundle group 14, that is, the branched part (branched hair) 12B in the central hair bundle 12 constituting the central hair bundle group 14 It is preferable that the value (central hair density) divided by the total number of hairs by the area of the central hairy area 11 is 1000 pieces/cm 2 or more and 5000 pieces/cm 2 or less. If the hair growth density of the branching portion (branch hairs) 12B is less than 1000 hairs/cm 2 , there is a possibility of lack of dispersibility due to insufficient branching, and the hair transplantation density of the branching portion (branch hairs) 12B is 5000 hairs/cm 2 . If it exceeds, there is a possibility that the number of branch hairs is too large and the agitation power is lacking, resulting in insufficient foaming. If the hair transplant density of the branching part (branch hair) 12B is 1000 hairs/cm 2 or more and 5000 hairs/cm 2 or less, the dispersibility is excellent and good foaming can be achieved. Moreover, even if the hair transplantation density of the branch part (branch hair) 12B is within the said range, since the hair transplant density of the base part 12A is smaller and it moves easily, a tooth surface etc. can be reliably cleaned.

The outer hair 23 is ST hair (super tapered hair) with thin bristle tips. The hair diameter of the outer hair 23 can be determined in consideration of the material of the outer hair 23 and the like, and is, for example, 6 to 9 mil (1 mil = 1/1000 inch = 0.025 mm). If it is 6 mil or more, a hair waist that can clean the cervical region satisfactorily is secured, and if it is 9 mil or less, flexibility to relieve irritation to the gums and the like is secured. In addition, the hair diameter in the ST hair is the diameter in the base part.

As described above, according to the present embodiment, the central hair bundle 12 has the branching portion 12B, and is represented by the maximum diameter width W1 of the branching portion 12B/diameter W2 of the base portion 12A. Since the value exceeds 1.0 and is less than or equal to 2.0, it is possible to contribute to the effective utilization of the formulation by suppressing accumulation of the formulation. Further, according to the present embodiment, since the hair density obtained by dividing the total number of branch portions 12B by the area of the central hair-flotted region 11 is 1000/cm 2 or more and 5000/cm 2 or less, the dispersibility is excellent and good foaming is obtained. It becomes possible for this to happen.

According to this embodiment, since the value obtained by dividing the maximum length of the outer tufted region 21 in the width direction by the maximum length of the central tufted region 11 is 1.0 or more and 5.0 or less, excellent retention and dispersibility for the formulation are secured. can do. 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 it is easy to enter the interdental area cervical region, so the cleaning effect is increased. According to this embodiment, since the hair bundle diameter of the central hair bundle 12 is 1.0 mm or more and 1.5 mm or less, it becomes possible to ensure the retention and dispersibility of the formulation.

According to this embodiment, since the length of the outer hair bundle 22 on the hair transplant surface 5 is longer than the length of the central hair bundle 12 on the hair transplant surface 5, the outer hair bundle 22 on the central hair bundle 12 ) can be formed, and the retention and foaming properties of the formulation can be improved. According to this embodiment, since the hair 23 for outer side is ST hair (super tapered hair), the cleaning feeling to a tooth neck part can be improved.

The present invention is not limited to the above-described embodiment. Although the central hair bundle 12 has a substantially cylindrical shape in the above-described embodiment, it may be, for example, an elliptical elliptical columnar shape when viewed from a plane, or a polygonal columnar shape such as a triangle, a quadrangle, or a pentagon when viewed from a planar view. . In addition, when the shape of the central hair bundle 12 is made other than a substantially cylindrical shape, the hair bundle diameter becomes the diameter of a perfect circle circumscribed to the shape when seen from a plane.

In addition, the outer hair bundle 22 may have an elliptical elliptical column shape when viewed from a plane, similar to the central hair bundle 12, or a polygonal column shape such as a triangle, a quadrangle, or a pentagon when viewed from a plan view.

In the embodiment described above, the central tufting hole 10 has a cylindrical shape with a bottom, but the shape of the central tufting hole 10 can be determined according to the shape of the central hair bundle 12, for example, the central tufting hole (10) may be an elliptical bottomed cylinder when viewed from a plane, or may be a bottomed polygonal cylinder such as a triangle, a quadrangle or a pentagon when viewed from a plane. In addition, the outer tufting hole 20 may have an elliptical bottomed cylinder when viewed from a plane, similar to the central tufted hole 10, or a bottomed polygonal cylinder such as a triangle, a quadrangle, or a pentagon when viewed from a plane. good night.

In the embodiment described above, the diameters of all the central tufted holes 10 are substantially equal, but the present invention is not limited to this, and the diameters of all the central tufted holes 10 may be different from each other, and some of the central tufted holes may be different from each other. The diameter of (10) and the diameter of the other central tuft hole 10 may differ. In addition, in the embodiment described above, although the diameters of all the outer tuft holes 20 are substantially equal, the present invention is not limited to this, and the diameters of all the outer tuft holes 20 may be different from each other, and some outer tuft holes 20 may have different diameters. The diameter of the tuft hole 20 and the diameter of the other outer tuft hole 20 may be different.

In the embodiment described above, although the outer hair 23 is ST hair, the present invention is not limited to this, and for example, the outer hair 23 may have a uniform diameter over its longitudinal direction, and the tip is hemispherical. It may be a surface parallel to the surface or the hair transplanted surface. However, from the viewpoint of making it easy to enter the periodontal pocket or interdental area, it is preferable that the outer hair 23 of a part of the outer hair bundle 22 is ST hair or tapered hair, and all the outer hair 23 of the outer hair bundle 22 It is more preferable that is a ST hair or a tapered hair.

In the embodiment described above, although the hair length of the central hair bundle 12 is shorter than the hair length of the outer hair bundle 22, for example, the hair length of the central hair bundle 12 and the outer hair bundle 22 The hair length may be the same, that is, the hair length difference may be 0 mm, and the hair length of the central hair bundle 12 may be longer than the hair length of the outer hair bundle 22. In addition, the hair lengths of the central hair bundle 12 and the outer hair bundle 12 may be set so that the shape in which the tips of these hair bundles are arranged is a concavo-convex surface repeating peaks and valleys in the axial direction of the handle body.

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 improving the retention of the formulation.

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

In the embodiment described above, the first or second outer hair bundle groups 24a, 24b are constituted by 12 outer hair bundles 22, but, for example, the first or second outer hair bundle groups 24a, 24b The number of outer hair bundles 22 constituting may be 11 or less, and may be 13 or more.

The number of outer hair bundles 22 constituting the first outer hair bundle group 24a and the number of outer hair bundles 22 constituting the second outer hair bundle group 24b may be the same or different. .

Example

(Assessment Methods)

About the toothbrush of each case, "dispersibility of formulation", "foam generation", "holdability of formulation", and "feeling of cleaning the cervical area" of the preparation were evaluated by the following method.

<Evaluation of dispersibility of preparation>

The dispersibility of the formulation was evaluated by a sensory test using a panel of 10 experts. After putting 1 g of commercially available dentifrice on the toothbrush shown in each Example and Comparative Example and brushing for 3 minutes, the amount of dentifrice remaining on the toothbrush was evaluated according to the following evaluation criteria. The average score of 10 expert panelists is 3.5 or more and 4.0 or less as 「◎」, the average score is 3.0 or more and less than 3.5 as 「○」, the average score is 2.0 or more and less than 3.0 as 「△」, and the average is 2.0 Less than "x" was made, and it was judged that the toothbrush from which favorable dispersibility was obtained was what ensured the dispersibility of (double-circle) or (circle).

≪Evaluation Criteria≫

4 points: No dentifrice remains between the hair tufts of the toothbrush.

3 points: Although the dentifrice remains between the hair tufts of the toothbrush, the degree to which it spans 1 to 2 hair tufts.

2 points: Skirt material remains between 3 to 4 hair bundles.

1 point: Skirt material remains over 5 hair bundles or more.

<Evaluation of foam generation>

Foam generation was evaluated by a sensory test using 10 expert panelists. Foam generation in the oral cavity when 1 g of commercially available dentifrice was placed on the toothbrush shown in each Example and Comparative Example and brushed for 3 minutes was evaluated according to the following evaluation criteria. The average score of 10 expert panelists is 3.5 or more and 4.0 or less as 「◎」, the average score is 3.0 or more and less than 3.5 as 「○」, the average score is 2.0 or more and less than 3.0 as 「△」, and the average is 2.0 Less than one was set as "x", and it was judged that the toothbrush which foam generation of (double-circle) and (circle) was ensured was good foam generation at the time of brushing teeth.

≪Evaluation Criteria≫

4 points: good foaming

3 points: foaming

2 points: Slight foaming

1 point: no foaming at all

<Evaluation of retention of preparation>

1 g of dentifrice was placed on the hair planting part of the toothbrush, and the plastic plate was scrubbed for 90 seconds on the hair planting part on which the toothbrush was placed (load: 200 g, speed: 160 strokes/minute). After that, the mass of the toothbrush after scrubbing was measured using the mass of the toothbrush before 1g of dentifrice was placed as a weight, and the mass (residual amount) of the dentifrice remaining on the dentifrice was obtained, and the residual rate was calculated by the following formula (i) Saved. The retention rate of the formulation was evaluated by classifying the obtained residual rate according to the following evaluation criteria.

Residual rate (% by mass) = Residual amount (g) ÷ 1g × 100... (i)

≪Evaluation Criteria≫

◎: Residual rate is 30% or more

○: Residual rate is 20% by mass or more and less than 30% by mass

△: Residual rate is 15% by mass or more and less than 20% by mass

×: Residual rate is less than 15% by mass

<Evaluation of cervical cleaning feeling>

The feeling of cleaning the cervical region was evaluated by a sensory test using a panel of 10 experts. The feeling of cleaning the tooth cervical region of the toothbrush shown in each Example and Comparative Example was evaluated according to the following evaluation criteria. The average score of 10 expert panelists is 3.5 or more and 4.0 or less as 「◎」, the average score is 3.0 or more and less than 3.5 as 「○」, the average score is 2.0 or more and less than 3.0 as 「△」, and the average is 2.0 Less than was set as "x", and it was judged that the toothbrush from which the feeling of cleaning a tooth neck part was favorable at the time of tooth brushing was obtained for ensuring the feeling of cleaning the cervical part of (double-circle) and (circle). In addition, the feeling of cleaning the tooth neck was evaluated only when the outer hair bundle 22 was ST hair (Example 10 and Comparative Example 5).

≪Evaluation Criteria≫

4 points|pieces: The touch from which the contamination of the clearance gap between a tooth and a gum came off is felt very much.

3 points|pieces: The touch from which the contamination of the clearance gap between a tooth and a gum was removed is sensed.

2 points|pieces: The touch from which the contamination of the clearance gap between a tooth and a gum came off was not felt very much.

1 point|piece: The touch from which the contamination of the clearance gap between a tooth and a gum came off is not felt.

(Examples 1 to 10, Comparative Examples 1 to 5)

According to the specifications shown in Tables 1 to 3, in the same way as the toothbrush 1 in FIG. 1, a central hair bundle (shown as ●) was planted in the central hair transplant region, and an outer hair bundle (shown as ○) was transplanted in the outer hair transplant region. made a toothbrush. In the table, "tip width" is the maximum diameter width W1 of the tip portion of the branched portion 12B of the central hair bundle 12.

"Hole diameter" is the diameter of the center hair hole 10 in which the center hair bundle 12 is planted, that is, the diameter of the cross section orthogonal to the longitudinal direction of the center hair bundle 12, and the base portion of the center hair bundle 12 It is the diameter W2 of 12A.

"Tip part (vertical direction)/hole diameter" is a measured value of W1/W2 in the width direction of the head part 4.

"Tip part (horizontal direction)/hole diameter" is a measured value of W1/W2 in the longitudinal direction of the head part 4.

"Tip part (inclination direction)/hole diameter" is W1/W2 in the direction connecting the centers of two adjacent tuft holes existing in a direction that is not perpendicular even if parallel to the direction of the axis line O of the head part 4. is a measure of

About the toothbrush of each obtained case, "dispersibility of formulation", "foam generation", "retainability of formulation", and "feeling of cleaning a cervical area" were evaluated.

As shown in Table 1 and Table 2, in Examples 1 to 10 to which the present invention was applied, the dispersibility of the formulation, foam generation, and the retention of the formulation were all evaluated as "◎" or "○". In addition, about Example 10, the evaluation of the tooth-cervical cleaning feeling was "(circle)".

On the other hand, as shown in Table 3, in Comparative Example 1 in which the value of the width of the outer hair transplantation/the width of the center portion was 0.4, the dispersibility of the formulation was evaluated as "◎", but the foam generation was evaluated as "Δ", and the retention of the formulation was evaluated as "◎". It was "X".

In Comparative Example 2, in which the value of the outer hairing width / center hairy width was 6.1, the retention of the formulation was evaluated as "○ to ◎", but the foam generation was evaluated as "Δ" and the dispersibility of the formulation was evaluated as "x".

Tip width (oblique direction or transverse direction) (W1) / base diameter (central hair hole diameter) (W2) value is 0.92, tip width (vertical direction) (W1) / base diameter (central hair hole diameter) ( In Comparative Example 3 in which the value of W2) was 0.55 and the hair transplant density at the tip was 792 pieces/cm2, the retention of the formulation was evaluated as "○ to ◎", but the foaming evaluation was "x" and the dispersibility of the formulation was evaluated as " ×” was.

The value of tip width (oblique direction or transverse direction) (W1) / base diameter (central hair hole diameter) (W2) is 2.32, tip width (vertical direction) (W1) / base diameter (central hair hole diameter) ( In Comparative Example 4 in which the value of W2) was 2.04 and the hair transplant density at the tip was 9503 pieces/cm 2 , the evaluation of the retention of the formulation was “○ to ◎”, but the evaluation of foaming was “×” and the evaluation of the dispersibility of the formulation was “ ×” was.

In Comparative Example 5, where the hair length of the central hair bundle is longer than that of the outer hair bundle, the dispersibility of the formulation was evaluated as "◎", but the foam generation was evaluated as "Δ to ○", the retention of the formulation was evaluated as "×", and the cervical region Evaluation of cleaning feeling was "x".

From these results, it can be seen that a toothbrush satisfying all of the holding properties and dispersibility of the formulation, foam generation, and the feeling of cleaning the cervical region can be obtained by applying the present invention.

As mentioned above, although preferred embodiment by this invention was described referring attached drawing, it goes without saying that this invention is not limited to the relevant example. The various shapes, combinations, etc. of each constituent member shown in the above examples are examples, and various changes are possible based on design requirements and the like within a range not departing from the gist of the present invention.

The present invention can be applied to toothbrushes.

1: toothbrush 2: handle body
4: head part 5: hair transplant surface
10: central tufted hole 11: central tufted area
12: central hair bundle 12A: base part
12B: branch 13: central features
20: outer hair follicle 21: outer hair follicle area
22: outer hair bundle 23: outer appearance

Claims (6)

In the toothbrush provided with a handle body having a head portion formed at the tip, and in which hair bundles of hair are planted in a plurality of hair transplant holes formed on the hair transplant surface of the head portion,
The hair transplanting surface is a central hair transplant region in which a plurality of central hair bundles are planted at an approximate center in the width direction orthogonal to the axis line and arranged in parallel in the axial direction of the handle body;
Has an outer hair transplant region in which a plurality of outer hair bundles are planted by sandwiching the central hair bundle in the width direction;
The central hair bundle is composed of tip branch hairs having a tip branch at the tip of the body,
The maximum diameter width of the tip branch in the central hair bundle / the value represented by the hair bundle diameter formed at the trunk portion in the base portion of the central hair bundle exceeds 1.0 and is 2.0 or less,
The hair transplant density obtained by dividing the total number of hairs constituting the branched portion by the area of the central hair transplant region is 1000 hairs/cm2 or more and 5000 hairs/cm2 or less,
The value represented by the maximum length of the outer tufted region in the width direction / the maximum length of the central tufted region in the width direction is 1.3 or more and 4.7 or less,
The outer hairy region has a first outer hairy region formed on one side of the central hair bundle in the width direction and a second outer hairy region formed on the other side of the central hair bundle in the width direction,
In the row in which the center hole into which the central hair bundle is planted and the outer hair hole into which the outer hair bundle is planted are arranged in the width direction, the maximum number of the total number of the outer hair hole into which the outer hair bundle is planted is 4 or more and 8 or less. is,
In the row in which the center hair hole into which the center hair bundle is planted and the outer hair hole into which the outer hair bundle is planted are arranged in the width direction, the maximum number of the total number of the center hair hole into which the center hair bundle is planted is 2 or more, Toothbrush, characterized in that 5 or less. According to claim 1,
The diameter of the hair hole in which the outer hair bundle is planted is 1.4 mm or more and 2.0 mm or less,
Toothbrush, characterized in that the diameter of the hair hole in which the central hair bundle is planted is 1.0 mm or more and 1.5 mm or less. According to claim 1 or 2,
Toothbrush, characterized in that the length of the outer hair bundle on the hair-transplanted surface is longer than the length on the hair-transplanted surface of the central hair bundle. According to claim 1 or 2,
The outer hair bundle is a toothbrush, characterized in that it includes a feature that gradually decreases in diameter toward the tip of the hair. According to claim 1 or 2,
The toothbrush according to claim 1 , wherein the maximum length of the entire hair transplant 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. delete

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