JP5147223B2 - toothbrush - Google Patents

Description

  The present invention relates to a toothbrush, and more particularly to a toothbrush with improved oral cleaning properties by the arrangement of hair bundles implanted in a flocking table.

    In order to effectively clean the teeth by brushing, it is important that the brush reaches the narrow gaps such as the interdental part and the cervical part to scrape the plaque, and at that time the gingiva etc. are not damaged. . Accordingly, various arrangements of hair bundles have been proposed for the purpose of enabling such brushing.

  The arrangement of the bristle bundle in a general toothbrush is obtained by implanting a plurality of bristle bundles substantially perpendicular to the planting surface of the handle hair flocking table. In this arrangement, the hair tips are easily brought into contact with the tooth surface, so that the contact feeling in the oral cavity is soft, but the hair bundle reaches a narrow gap such as an interdental part or a tooth neck part. Is difficult. On the other hand, if the rigidity of the brushes constituting the hair bundle is increased, the penetration into the gap portion becomes possible to some extent, but the hardness of the brush deteriorates the contact feeling in the oral cavity, and in some cases, gums, etc. There was a difficulty of hurting.

  In order to cope with this, an arrangement form in which a plurality of hair bundles are inclined so as to contact each other at the upper end has been proposed. For example, in the toothbrush described in Patent Document 1, by making the adjacent rectangular flock holes inward from each other with respect to the flocked surface, the planted hair bundle is brought into contact with the tip to strengthen the hair waist, The improvement of the cleaning between teeth is aimed at. In addition, the toothbrush described in Patent Document 2 has an arrangement form in which three adjacent hair bundles are inclined toward the center portion and the tips of hairs are brought together to form a triangular pyramid-shaped chevron. To make it easier to enter the interdental area.

  However, a toothbrush with such an inclined arrangement of bristles, as a result of the plurality of slanted bunches bringing the bristles together, makes the fleshy as a whole strong, and as a result, entry into the gap is somewhat easy. However, the aggregate of the hair tips in which a plurality of hair bundles are close to each other has a large diameter, and the penetration into the gap portion is not sufficient. In addition, the strength of the hair and waist strengthened the feeling of contact with the oral cavity, and a good feeling of use was not obtained.

On the other hand, in the toothbrush described in Patent Document 3, the two hair bundles are inclined to bring the hair tips together, and the aggregate of the hair tips is cut into a mountain so that the tip is tapered. This is intended to improve both interdental penetration and the feeling of contact during use. However, in this hair bundle arrangement, the ridge line of the cut end at the tip of the hair tip extends in a single direction, and the hair bundle has anisotropy, so the tapered tip acts only in a limited brushing direction. Without sufficient penetration into the gap. In addition, since the tip of the hair tip is cut into a chevron, the amount of hair at the hair tip portion is small, and the cleanability of the gap portion (particularly the tooth neck portion) cannot be obtained sufficiently.
JP 2000-201739 A JP-A-8-164025 JP 2004-129683 A

  The present invention solves the above-mentioned problems of the prior art, allows a brush to reach a narrow gap such as an interdental part or a cervical part, scrapes plaque, and has a soft contact feeling that hardly damages gums. The purpose is to provide.

  In order to achieve the above object, the present invention provides a toothbrush in which a plurality of hair bundles are implanted on a flocking table, wherein at least a part of the hair bundles are erected from the planting surface, A plurality of peripheral hair bundles that are inclined and extended from a position planted so as to surround and a position in contact with the upper portion of the central hair bundle constitute a complex hair bundle group, and the tip of the central hair bundle has the tip The present invention provides a toothbrush characterized by projecting from the tip of a surrounding bristle bundle.

  The toothbrush according to the present invention is planted so that at least a part of the plurality of hair bundles planted on the hair transplant table surrounds the central hair bundle standing from the planting surface and the central hair bundle. A plurality of peripheral hair bundles that are inclined and extended from a separated position to a position in contact with the upper part of the central hair bundle, and a tip of the central hair bundle is formed from a tip of the peripheral hair bundle. It protrudes. Therefore, during use, the protruding central hair bundle can easily enter the gap portion, and the surrounding hair bundle supports the central hair bundle from the periphery against the reaction force received during the entry, so that the lodging is prevented. A reliable approach is possible. In addition, since the surrounding hair bundle surrounding the central hair bundle is inclined and extended from a position away from the central hair bundle to a position in contact with the upper portion of the central hair bundle, from the planting surface to the contact position, A space is formed between the hair bundle and the surrounding hair bundle. Therefore, when the force acting in the direction along the hair bundle is too strong with respect to the center hair bundle, the center hair bundle or the filaments constituting the center hair bundle can bend in the gap between the surrounding hair bundles. . As a result, when the hair bundle is strongly pressed in the oral cavity, the center hair bundle is bent and its tip is retracted toward the tip side of the surrounding hair bundle, and a sharp contact feeling is alleviated. Thereby, a soft contact feeling in the oral cavity can be obtained while allowing a good entry of the hair bundle into the gap portion. Further, even when the central hair bundle is retracted due to the bending of the central hair bundle, the effect of cleaning the interdental portion, the tooth neck portion, and the like according to the inclination direction of each hair bundle can be obtained by the tip of the surrounding hair bundle. Further, the peripheral hair bundle is inclined to a position where it comes into contact with the upper part of the central hair bundle, thereby providing a supporting action between the central hair bundle and between the peripheral hair bundles. As a result, lodging during brushing is prevented and high durability is obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The same or similar parts in the drawings may be denoted by the same reference numerals and description thereof may be omitted.

  FIG. 1 is an enlarged view of a flocked portion of a toothbrush according to an embodiment of the present invention, where (i) is a plan view and (ii) is a front view. In this toothbrush, a large number of hair bundles are implanted on the hair transplant table 1 of the handle. Among these hair bundles, those indicated by a1 to a8 in FIG. 1 (i) are central hair bundles, and the peripheral hair bundles are located on a circle indicated by a one-dot chain line centering on each central hair bundle. . In the figure, each hair bundle is shown as a cross section cut along the upper surface (planting surface) of the flocking table. The surrounding hair bundles surrounding the center hair bundle a1 are indicated by b11, b12, b13, and the surrounding hair bundles surrounding the center hair bundle a2 are indicated by b21, b22, b23. Similarly, for the center hair bundles a3 and a4, the peripheral hair bundle is indicated by a symbol having b at the head. In addition, about the center hair | bristle bundle a5-a8, the code | symbol of the surrounding hair | bristle bundle is abbreviate | omitted. The hair bundles c1 to c5 are normal hair bundles. FIG. 1 (ii) also shows the central hair bundles a1 to a4, the peripheral hair bundles b11 to b43, and the hair bundles c1 and c2.

  In the present embodiment and the following embodiments, the central hair bundle, the peripheral hair bundle, and the normal hair bundle are indicated by black, white, and hatched circles in the plan view. When a plurality of hairs are not individually distinguished, they are referred to as a center hair bundle a, a peripheral hair bundle b, and a normal hair bundle c.

  As a representative example in this embodiment, the center hair bundle a2 and its surrounding hair bundle will be described. The center hair bundle a2 stands upright in the direction perpendicular to the flocked surface, and surrounding hair bundles b21, b22, b23 surround from three directions. The peripheral hair bundles b21, b22, b23 are inclined with respect to the center hair bundle a2 from a position separated from the planting surface to a position in contact with the center top of the center hair bundle. It constitutes a group. And the center hair | bristle bundle a2 protrudes upwards from the front-end | tip of surrounding hair | bristle bundle b21, b22, b23.

  In order to support the central hair bundle by the peripheral hair bundle isotropically and uniformly, the distance from the central hair bundle to each peripheral hair bundle on the planting surface is made equal, and the peripheral hair bundles are positioned at equal intervals. It is desirable to let them. However, for the convenience of arranging a large number of hair bundles on the planting surface, these distances and intervals are not necessarily equal. However, it is desirable to arrange the peripheral hair bundle so that the center of any of the peripheral hair bundles is located on both sides of an arbitrary straight line passing through the center of the central hair bundle on the planting surface. Thereby, the bias of the support of the center hair bundle by the surrounding hair bundle can be limited, and the effect by the support can be ensured.

  The center hair bundle is preferably 5 to 15 mm in height from the planting surface in terms of ease of use and cleanability. The amount by which the central hair bundle protrudes from the tip of the surrounding hair bundle is preferably 0.5 to 5 mm. As a result, the protruding central hair bundle can easily enter the gap portion, and the surrounding hair bundle supports the central hair bundle from the periphery against the reaction force received during the entry, so that it is possible to prevent overturning and ensure The effect that entry becomes possible is acquired. If the amount of protrusion is smaller than this lower limit, sufficient penetration into gaps such as between teeth cannot be obtained. Further, if the protruding amount exceeds this upper limit, the support of the center hair bundle by the surrounding hair bundle becomes unstable, and also the penetration into the gap portion such as between the teeth cannot be sufficiently obtained, and the center hair bundle Tends to be worn out and the durability is lowered.

  The separation distance between the edges of the flock holes of the surrounding hair bundle and the flock holes of the center hair bundle on the planting surface is preferably 0.5 to 5 mm. As described above, the peripheral hair bundle extends in an inclined manner from a position separated from the central hair bundle to a position in contact with the upper portion of the central hair bundle, so that a gap is formed between the central hair bundle and the peripheral hair bundle. The central hair bundle or filaments that are formed can be deflected within this gap. As a result, when the hair bundle is strongly pressed in the oral cavity, the central hair bundle is bent and the sharp contact feeling is relieved, and the hair bundle is allowed to enter the gap portion while being soft. A feeling of contact is obtained. Furthermore, as a result of the slanting of the surrounding hair bundle, a support action is achieved between the central hair bundle and between the surrounding hair bundles. As a result, lodging during brushing is prevented and high durability is obtained. If the separation distance is smaller than the above lower limit, the gap between the center hair bundle and the surrounding hair bundle becomes small, and the flexibility of the center hair bundle is lowered, making it difficult to obtain a soft feel and supporting the center hair bundle. The force becomes insufficient, and sufficient penetration into gaps such as between teeth cannot be obtained. On the other hand, if the separation distance exceeds this upper limit, the density of the hair bundles provided on the flocking table will be low, sufficient cleaning performance will not be obtained, and the distance from the surrounding hair bundle to the center hair bundle will be too long. As a result, an appropriate support action cannot be obtained.

  As in this embodiment, the plurality of central hair bundles a are desirably arranged in a zigzag manner in the axial direction on the flocking table. Thereby, the surrounding hair | bristle bundle b of the adjacent center hair | bristle bundle a can be arrange | positioned closely without interfering with each other, and the arrangement | positioning density of a hair | bristle bundle can be made high. For example, in the case of the adjacent central hair bundles a2 and a3, the surrounding hair bundles b21, b22 and b31, b33 are arranged close to each other without interfering with each other.

  Each bristle bundle can be constituted by bundling various filaments used in ordinary toothbrushes, and the material of the filament is not particularly limited, such as nylon, polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), etc. Can be used. The filament material can be variously employed, such as a circular cross section, an irregular cross section such as a square or a star, or a composite fiber such as a core-sheath type. Alternatively, at least one hair bundle in the center hair bundle and the surrounding hair bundle can be a monofilament made of a soft material such as an elastomer.

  In order to plant the hair bundle on the flocking table, the filament is bent, a flat wire is sandwiched between them, and these are tightly inserted into a planting hole provided in the flocking table. Alternatively, the hair bundle is passed through a support plate having a large number of through holes, the base end portions thereof are melted to increase the diameter, the base end portions are placed in the mold cavity, and the resin is poured into the mold. It can also be performed by a melting method (for example, a method described in JP-A-2003-102552).

  According to the toothbrush according to this embodiment, at the time of use, the protruding central hair bundle a in the composite bristle bundle group easily enters the gap portion, and the peripheral hair bundle b is the central hair against the reaction force received at the time of entry. Since the bundle a is supported from the periphery, it is possible to prevent the lodging and to enter reliably. Further, a gap s (FIG. 1 (ii)) is formed between the center hair bundle a and the surrounding hair bundle b in the range from the planting surface to the contact position. Accordingly, when the force acting in the direction along the hair bundle is too strong with respect to the center hair bundle a, the center hair bundle or the filaments constituting the center hair bundle bends in the gap between the surrounding hair bundle b. And sharp contact feeling is alleviated. By these, the favorable penetration property of the hair | bristle bundle to a clearance gap part, and a soft contact feeling in an oral cavity are obtained. Furthermore, as a result of the inclination of the peripheral hair bundle b, the peripheral hair bundle b performs a supporting action between the central hair bundle a and between the peripheral hair bundles b, so that lodging during brushing is prevented and high durability is obtained. In addition, in order to improve the operability of the toothbrush in the oral cavity, the thickness of the flocking table is desirably 3.8 mm or less.

  2 to 6 show various examples of the composite hair bundle group. In each figure, the central hair bundle is indicated by a, the peripheral hair bundle is indicated by b, and the flocking table is indicated by 1. In the example of FIG. 2, one central hair bundle a is supported by four peripheral hair bundles b. In this example, the complex hair bundle group located closest to the tip of the flocking table supports one central hair bundle a by four peripheral hair bundles b in accordance with the shape of the flocking table. In the example of FIGS. 3 and 4, one central hair bundle a is supported by six and eight peripheral hair bundles b, respectively. In these examples, the central hair bundle a and the peripheral hair bundle b have the same diameter, but in the examples of FIGS. 5 and 6, they have different diameters.

  That is, in the example of FIG. 5, one central hair bundle a having a small diameter is supported by three peripheral hair bundles b having a large diameter. In the example of FIG. 6, one central hair bundle a having a large diameter is supported by three peripheral hair bundles b having a small diameter. As in the example of FIG. 6, by increasing the diameter of the central hair bundle a, the rigidity of the hair bundle can be made higher than that of the surrounding hair bundle b (the hair waist is strengthened). Therefore, the penetration property to gap parts, such as between teeth, is high, and a firm and full contact feeling is obtained. On the other hand, as shown in the example of FIG. 5, by reducing the diameter of the central hair bundle a, the rigidity of the hair bundle can be made lower than that of the surrounding hair bundle b (the lower back is weak), and the contact feeling in the oral cavity Becomes softer.

  As the filaments constituting these hair bundles, various materials used in ordinary toothbrushes can be used singly or in combination. Therefore, in addition to making the diameter of the hair bundle different as shown in FIGS. 5 and 6, it is also possible to adjust the rigidity of the hair bundle by making the material, diameter, etc. of the filament constituting the hair bundle different.

  As shown in the right hair bundle in FIG. 1 (ii), each of the surrounding hair bundles b has its tip surface so that the angle θ formed between the side surface in contact with the center hair bundle a and the tip surface is an acute angle. Is preferably inclined. Thereby, since the circumference | surroundings are open | released ensuring the support of the center hair | bristle bundle a, the penetration property to a clearance gap part improves more. For this purpose, each θ is preferably 15 to 75 degrees, and in this example, it is 45 degrees. When the lower limit is not reached, the tip of the peripheral hair bundle becomes thin and the support of the central hair bundle becomes insufficient. Moreover, when the said upper limit is exceeded, the circumference | surroundings of a center hair | bristle bundle are not fully open | released but it becomes difficult to obtain the favorable entrance property to a clearance gap part.

  In addition to the inclined surface described above, the tip of the peripheral hair bundle can be in various forms such as a round shape such as a hemisphere, a planar shape perpendicular to the axis, and the like. As shown in FIG. 7, the peripheral hair bundle is assumed to have an inclined surface at the tip so that the angle θ ′ formed between the side surface far from the center hair bundle a and the tip surface is an acute angle. You can also. In this case, when the complex hair bundle group is strongly pressed against the tooth, the tip of the peripheral hair bundle is in accordance with the component force acting perpendicularly to the inclined surface by contact between the inclined surface of the peripheral hair bundle tip and the tooth surface. Is separated from the upper part of the central hair bundle, and with this, the advantage that the central hair bundle can enter the back of the gap portion is obtained. For this purpose, each θ ′ is preferably 15 to 75 degrees, and in this example, it is 45 degrees. When the lower limit is not reached, the tip of the peripheral hair bundle becomes thin and the support of the central hair bundle becomes insufficient. Further, when the above upper limit is exceeded, separation from the center hair bundle is not sufficiently performed when pressed against the teeth. In addition, this inclined surface forms an acute edge portion on the side of the surrounding hair bundle that is far from the center hair bundle, so that a cleaning effect by the edge portion is obtained and the center hair bundle is scraped from the gap portion of the teeth. It is also possible to enhance the effect of removing plaque.

  When the composite hair bundle group shown in FIG. 1 is viewed from above, it is as shown in FIG. 8 (i). That is, the peripheral hair bundle b extends in the radial direction (indicated by a one-dot chain line in the figure) from the planting position Db on the planting surface to the contact position Ub to the center hair bundle, with the center hair bundle a as the center. In addition, as a configuration form of the composite hair bundle group, as shown in FIG. 8 (ii), the peripheral hair bundle b is a straight line connecting the centers of the planting position Db and the central hair bundle a (the dashed line in the figure). It is also possible to extend in a direction shifted with respect to the contact position Ub. In the latter case, the peripheral hair bundle b is extended in a spiral shape, the support force for the central hair bundle a is slightly weaker than the former, and the feeling of contact with the central hair bundle becomes softer.

  The present invention is not limited to the above embodiment, and various modifications can be made. For example, as shown in FIG. 9, the height of surrounding hair bundles can be changed in one composite hair bundle group. FIG. 9 (i) shows an example in which the peripheral hair bundle extending in the radial direction around the central hair bundle a becomes lower in the order of b1, b2, and b3 in the figure. FIG. 9 (ii) shows an example in which the peripheral hair bundle extending spirally around the center hair bundle a is lowered in the order of b1 ', b2', b3 'in the figure. 9 (i) and (ii), for one compound hair bundle group surrounded by an imaginary circle, a plan view is shown at the center of each, and the figures arranged around it show the center hair bundle from the placement direction. The state seen is shown together with a part of the flocking table 1. As described above, when the height of the peripheral hair bundle is changed, the support of the central hair bundle and the action of preventing the fall are stronger as the peripheral hair bundle extending higher. Therefore, by raising the peripheral hair bundle near the outer periphery of the flocking table, it is possible to more effectively suppress the fall of the hair bundle to the outside and prevent the brush from spreading due to repeated use. Sex is obtained. Or the effective fall prevention effect with respect to the hair | bristle bundle which tends to fall down at the time of use can be acquired by adjusting the height arrangement | positioning of a surrounding hair | bristle bundle for every composite hair | bristle bundle group according to a hair transplantation form. In addition, by making the arrangement of the peripheral hair bundles having different heights evenly over the entire flocking table, it is possible to obtain a fall-preventing action in various brushing directions.

  (A)-(j) of FIG. 10 is a top view which shows the example of the shape and arrangement | positioning of the flock hole in a flocking table. The center hair bundle, the surrounding hair bundle, and the flock holes for normal hair bundles are indicated by black, white, and hatched figures (rectangles, triangles, circles, stars) in the figure, and constitute one composite hair bundle group The flocked hole is indicated by a virtual circle. Although the figure shows the flock holes for a composite flock group in which the number of surrounding follicles is 3, 5, and 6 for one central bristles, other numbers of flock holes and central follicles are shown. It is also possible to provide. In particular, when the number of surrounding hair bundles is 3, as shown in (a), (b), (c), (d), (e), (h), (i) of FIG. The pores are arranged in a grid pattern with four rows extending in the longitudinal direction of the flocking table and a plurality of rows extending in the width direction, two central holes located near the center in the flocking table width direction, and two outer sides located near the outer edge If the hole for the central hair bundle is configured with the holes, and these central holes and outer holes are alternately arranged in the longitudinal direction of the flocking table, the other flocked holes in the lattice arrangement are used as surrounding follicle hole, A configuration in which three peripheral hair bundles are arranged in one central hair bundle can be realized by orderly arranging the flock holes. Moreover, as shown in FIG.11 and FIG.12, the front-end | tip part of the center hair | bristle bundle a can also be made into various shapes. Each of (a) to (f) in FIG. 11 and (g) to (j) in FIG. 12 shows a front view on the upper side and a plan view on the lower side. By giving the end surface roundness as shown in FIGS. 11 (a) and 11 (b), the uncomfortable feeling at the time of contact in the oral cavity can be eased. As shown in (c), (d), and (e) of FIG. 11, the center of the tip is narrowed, or the two opposing sides of the tip are narrowed as shown in (f). The penetration into the part can be further enhanced. Further, as shown in (g) and (h) of FIG. 12, the tapered apex may be eccentrically positioned. As shown in FIG. 12 (i), by entering a large number of strips extending in the axial direction at the tip, it is possible to particularly improve the penetration into the details. Alternatively, as shown in (j) of FIG. 12, the contact feeling can be reduced by increasing the diameter of the tip, which is preferable when the gum is sensitive.

  Next, the test based on the Example of this invention is demonstrated. As an example of the present invention and a comparative example of a conventional type, a test was performed using a toothbrush having the specifications shown in Table 1.

(1) 試験１
顎模型を使用し、上顎の第二小臼歯、第一大臼歯、第二大臼歯に粉末状の疑似プラークを塗布し、以下の条件でブラッシングを行なった。

(1) Test 1
Using a jaw model, powdery pseudo plaques were applied to the upper second premolar, first premolar, and second premolar, and brushing was performed under the following conditions.

Brushing pressure: 250g
Stroke: 10mm
Speed: 120rpm
Brushing time: 10 seconds / tooth How to apply the toothbrush: The removal rate of the pseudo plaque that applied the bristles with the flocked base parallel to the tooth surface was determined as follows.

  The whole tooth surface on the front side of the first molar is a tooth surface part, the tooth surface part is divided into 10 equal parts by a vertical dividing line, and the divided both ends are interdental parts, and pseudo plaques at the tooth surface part and interdental part The removal area is calculated by image analysis.

Interdental removal rate (%) = (interdental area−remaining area of interdental area) / interdental area × 100
Tooth surface removal rate (%) = (tooth surface area−tooth area remaining area) / tooth surface area × 100
The obtained results are graphed and shown in FIG. As is apparent from this graph, in Examples 1 and 2, the removal rate is higher in both the tooth surface part and the interdental part than in Comparative Examples 1 to 3, and the difference is particularly remarkable in the interdental part. That is, this test result shows that the present invention is particularly excellent in the cleanability of the interdental part.
(2) Test 2
Twelve monitors used the toothbrushes of Examples 1 to 3 and Comparative Examples 1 to 3 in order, and evaluated the feeling of contact with the gums. In the evaluation, the average value of 12 people was calculated with 3 points for "I feel soft", 1 point for "I don't feel soft" and 2 points for "I can't say either". The results are shown in Table 2.

(3) 試験３
１２人のモニターが、実施例１〜３及び比較例１〜３の各歯ブラシを順次使用し、歯間部へ毛束又はフィラメントが進入している使用実感の有無についての評価をした。評価は、「実感がある」を３点、「実感がない」を１点、「どちらとも言えない」を２点とし、１２人の平均値を算出した。その結果を表３に示す。

(3) Test 3
Twelve monitors used each of the toothbrushes of Examples 1 to 3 and Comparative Examples 1 to 3 in order, and evaluated whether or not the hair bundle or filament had entered the interdental portion. The evaluation was made with an average value of 12 people, with 3 points for “actual”, 1 point for “not real” and 2 points for “I can't say either”. The results are shown in Table 3.

試験２及び３は、本発明の実施例が、歯茎への接触感及び歯間部への進入実感の双方において、比較例より優れていることを示している。これにより、本発明が、口腔内での接触感と隙間部分への進入性との双方において優れていることが明らかである。

Tests 2 and 3 show that the examples of the present invention are superior to the comparative examples in both the feeling of contact with the gums and the actual feeling of entering the interproximal part. Thus, it is clear that the present invention is excellent in both the sense of contact in the oral cavity and the ability to enter the gap.

The flocking part of the toothbrush which concerns on one Embodiment of this invention is expanded and shown, (i) is a top view, (ii) is a front view. The flocked part of the toothbrush which concerns on other embodiment of this invention is expanded and shown, (i) is a top view, (ii) is a front view. The flocked part of the toothbrush which concerns on other embodiment of this invention is expanded and shown, (i) is a top view, (ii) is a front view. The flocked part of the toothbrush which concerns on other embodiment of this invention is expanded and shown, (i) is a top view, (ii) is a front view. The flocked part of the toothbrush which concerns on other embodiment of this invention is expanded and shown, (i) is a top view, (ii) is a front view. The flocked part of the toothbrush which concerns on other embodiment of this invention is expanded and shown, (i) is a top view, (ii) is a front view. The further another embodiment of this invention is shown, and it is a front view which expands and shows a part of the flocked part of a toothbrush. It is a top view which expands and shows the composite bristle bundle group in the toothbrush shown in FIG. 1, and the composite bristle bundle group in other embodiment. It is a top view which expands and shows the composite hair | bristle bundle group in the toothbrush which concerns on further another embodiment of this invention. It is a top view which shows the example of the shape and arrangement | positioning of a flock hole applicable to the toothbrush which concerns on this invention. It is a figure which expands and shows the various tip shape applicable to the center bristle bundle in the toothbrush of this invention. It is a figure which expands and shows the various tip shape applicable to the center bristle bundle in the toothbrush of this invention. It is a graph which shows the test result by the Example and comparative example of this invention.

Explanation of symbols

1: Flocking table a, a1 to a8: Central hair bundle b, b11 to b43: Surrounding hair bundle s: Gap

Claims (4)

In a toothbrush in which a plurality of hair bundles are planted on a flocking table, at least a part of the hair bundles are planted so as to surround the central hair bundle and the central hair bundle standing upright from the planting surface. by a plurality of peripheral bristle tufts extending obliquely from a position to a position in contact with the central tuft top, it has a plurality the composite tufts group,
The toothbrush characterized in that the tip of the central hair bundle protrudes from the tip of the peripheral hair bundle.   The plurality of surrounding hair bundles surrounding one center hair bundle are located on one circle centered on the center hair bundle on the planting surface of the flocking table. Item 1. A toothbrush according to Item 1.   Each of the plurality of peripheral hair bundles surrounding one central hair bundle is inclined so that the angle formed between the side surface on the side in contact with the central hair bundle and the front end face is an acute angle. The toothbrush according to claim 1 or 2, characterized in that.   The toothbrush according to any one of claims 1 to 3, wherein a plurality of the composite bristle bundle groups are arranged in each of a longitudinal direction and a width direction of the flocking table.

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