JP2008194497A - Implantation structure of hairs - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an implantation structure of hairs which easily fits a tooth surface and has a good brushing effect and a gums massaging effect as well. <P>SOLUTION: The implantation structure of hairs has a curved surface portion 3B in which hairs 30 are formed with the tips aligned and the lengths of the tips of the hairs 30 gradually change from a flat surface portion 3A and a flat surface portion 3A at the tip of an hair bundle 3 made up of a plurality of the hairs 30. The gross area A1 of the hairs forming the flat surface portion 3A is preferably 0.12 to 5.0 mm<SP>2</SP>. The ratio between the cross-sectional area A0 of all the hairs of the hair bundle and the total cross-sectional area A1 (A1/A0) is preferably 0.01 to 0.4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flocking structure for bristles planted in a flocked portion of a toothbrush and a toothbrush having the flocking structure.

  Since toothbrushes are required to have good cleaning properties for complicated parts such as relatively smooth tooth surfaces and interdental parts, a plurality of toothbrushes that can effectively wipe these parts are used. Various toothbrushes have been proposed in which the tip of the hair bundle made of the above hair is cut into a mountain shape in consideration of the arrangement of teeth or stepped and arranged (see, for example, Patent Document 1 below).

  By the way, these toothbrushes can brush the interdental portion to some extent effectively, but the tip of the hair bundle is difficult to fit to the tooth surface, and the brushing effect of each tooth surface can be obtained. It wasn't.

On the other hand, in recent years, with the increasing awareness of periodontal disease, an increasing number of people also massage gums when brushing their teeth. In addition to the above-mentioned tooth surface brushing effect, gum massage effect (soft feel against gums) A combined toothbrush was desired.
JP-A-8-214947

  Accordingly, an object of the present invention is to provide a flocking structure for bristles that easily fits on the tooth surface, has an excellent brushing effect, and also has a massage effect on the gums, and a toothbrush having the flocking structure. .

  The present invention is a flocking structure of the hair that is planted in the hair planting portion of the toothbrush, and is formed by aligning the tips of the hair at the tip of the hair bundle composed of a plurality of hairs. The object is achieved by providing a bristle planting structure having a flat surface portion and a curved surface portion or an inclined surface portion in which the length of the hair tip of the hair gradually changes from the flat surface portion.

  Moreover, this invention provides the toothbrush provided with the flocking structure of the hair of the said invention.

  Here, in this specification, the length of the hair tip of the hair is gradually changed. The hair tip of the hair constituting the hair bundle in the curved surface portion and the inclined surface portion is more than 0 to 1.0 mm or less, In particular, it means that they are all changing from 0 to 0.5 mm.

  ADVANTAGE OF THE INVENTION According to this invention, the toothbrush which can be made to fit easily with respect to a tooth surface, was excellent in the brushing effect, and also had the massage effect of a gum is provided.

  Hereinafter, the flocking structure and toothbrush of the hair of this invention are demonstrated, referring drawings based on the preferable embodiment.

  FIGS. 1-3 shows the toothbrush provided with 1st Embodiment of the flocking structure of the hair of this invention. In these drawings, reference numeral 1 denotes a toothbrush.

  As shown in FIG. 1, the toothbrush 1 has a flocked portion 4 in which a hair bundle 3 to be described later is planted through a neck portion 20 at a tip portion of a brush body 2.

  As shown in FIG. 2 (a), a flocked base 41 having a flocked hole 40 is provided at the tip of the brush body 2. Then, the hair bundle 3 composed of a predetermined number of hairs 30 is inserted into the flock hole 40, a molten mass 31 is formed at the end of the hair bundle 3, and the covering portion 42 in which the molten mass 31 is covered with a filler. Is formed, and the flocked portion 4 is formed.

  As shown in FIGS. 2 and 3, the toothbrush 1 has a flat surface portion 3 </ b> A and a flat surface formed by aligning the tips of the hairs 30 at the tips of the hair bundle 3 composed of a plurality of hairs 30. The hair-planting structure of the hair which has the curved surface part 3B from which the length of the hair | bristle tip of the hair 30 to the surface part 3A changes gradually (continuously) is provided. Thus, it has the form in which the hair 30 fits a tooth surface easily by having the curved surface part 3B which changes gradually from 3A of flat surface parts. Further, by having the flat surface portion 3A and the curved surface portion 3B in which the bristles gradually change, there is an effect of dispersing the stress concentration applied to the hair by the polishing force, and a smooth polished feel is obtained and the gums are hardly damaged. Moreover, the deformation | transformation of the front-end | tip part of the hair in use is reduced (it is excellent in durability), and it can maintain performance for a long period of time.

In the above-described hair flocking structure, the total hair cross-sectional area A0 of the hair bundle 3 composed of the hair 30 is preferably 0.3 to 5.0 mm ² , particularly 1.0 to 4.0 mm ^2. . When the cross-sectional area is within such a range, a brushing effect and a gum massage effect by the flat surface portion 3A and the curved surface portion 3B as described later are sufficiently exhibited.

The total cross-sectional area A1 of the hair 30 for forming the flat surface portion 3A is preferably 0.12 to ^2.5 mm ² , particularly preferably 0.15 to 2.0 mm ² . When the total cross-sectional area is within such a range, a sufficient force can be transmitted between the teeth by the flat surface portion 3A, and the actual feeling of the brush entering between the teeth and the brushing effect can be obtained. Further, the flat surface portion 3A can be massaged without damaging the gums.

  The ratio (A1 / A0) of the total hair cross-sectional area A0 and the total cross-sectional area A1 of the hair bundle 3 is more preferably 0.05 to 0.4, and particularly preferably 0.1 to 0.3. When the cross-sectional area ratio is within such a range, the flat surface portion 3A can be more easily fitted to the tooth surface, and the high brushing effect and gum massage effect can be obtained.

  It is preferable that the flat surface portion 3A is provided so as to be substantially orthogonal to the length direction of the bristles 30, but there are a plurality of types of teeth having tooth surfaces that are curved with various curvatures, and places with poor alignment. Assuming that it may have an inclination in an angle range of 0 to 20 degrees with respect to a plane orthogonal to the length direction of the hair 30.

  The curved surface portion 3B has a convex arcuate contour when viewed from the side of the hair bundle 3, and has a radius of curvature of 0.5 to 5.0 mm, particularly 1.0 to 2. 5 mm is preferable. By setting the radius of curvature in such a range, the curved surface portion 3B has a curved shape with an intermediate curvature with respect to a plurality of types of teeth including tooth surfaces that are curved with various curvatures. Thus, it is possible to efficiently exhibit the operational effects obtained by using the flat surface portion 3A and the curved surface portion 3B as the tip of 3.

  The angle between the straight line connecting the contour of the curved surface portion 3B when the curved surface portion 3B is viewed from the side and the length direction of the hair is preferably 10 to 60 °, particularly preferably 15 to 45 °.

  The angle β (see FIG. 3A) of the bristles 30 with respect to the base surface 410 of the flocked base 41 is ± 0 to 15 °, particularly preferably ± 0 to 10 °. By setting the angle β in this range, it is possible to efficiently exhibit the operational effects obtained by making the tips of the hair bundle 3 into the flat surface portion 3A and the curved surface portion 3B.

  Moreover, it is preferable that the angle θ of the edge L serving as the boundary between the flat surface portion 3A and the curved surface portion 3B is ± 90 to 135 ° with respect to the vertical row direction M of the hair bundle.

  The hair length (height from the base surface 410) h of the hair 30 is preferably 5.0 to 17.0 mm, particularly preferably 9.0 to 12.0 mm. By setting the hair length of the bristles 30 within this range, it becomes possible to efficiently exhibit the operational effects of the flat surface portion 3A and the curved surface portion 3B.

  Moreover, the thickness of the hair 30 is preferably 5 to 11 mil (127 to 279 μm), particularly 7 to 9 mil (178 to 229 μm). By setting the thickness of the bristles 30 within this range, it is possible to efficiently exhibit the operational effects of the flat surface portion 3A and the curved surface portion 3B.

  The bristles 30 can be made of ordinary materials and forms conventionally used for bristles for toothbrushes without any particular limitation. Examples of the material for the hair 30 include polyamide such as nylon, and polyester such as polybutylene terephthalate and polytrimethylene terephthalate.

  Although there is no restriction | limiting in particular in the front-end | tip form of one hair 30, By making it round shape, it can also effectively avoid that a gum is damaged at the time of brushing.

  The toothbrush main body 2 is manufactured with the usual thermoplastic resin conventionally used for the toothbrush main body. Examples of the thermoplastic resin include polyolefin such as polypropylene, polyester such as polycarbonate and polyethylene terephthalate, polymethyl methacrylate, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, and the like. These thermoplastic resins can be used alone or in a suitable manner. In general, polypropylene having good moldability, relatively inexpensive, and excellent in chemical resistance is often used.

  The depth (the thickness of the flocked base portion 41) d of the flocked hole 40 stabilizes the flocked state of the hair bundle 3 and efficiently exhibits the effects of the flat surface portion 3A and the curved surface portion 3B. 1.0 to 3.0 mm, particularly preferably 1.5 to 2.5 mm.

  The flocking density (the ratio of the total hair cross-sectional area A0 of the hair bundle 3 to the cross-sectional area of the flocking hole 40) is preferably 60 to 80%, particularly preferably 65 to 75%. By setting the flocking density in this range, it is possible to efficiently exhibit the operational effects of the flat surface portion 3A and the curved surface portion 3B.

  The hair bundle 3 has a molten mass 31 so as to close the flock hole 40. In this way, by forming the molten lump 31 at one end of the hair bundle 3, when the molten lump 31 is covered with the filler and the hair bundle 3 is fixed to the hair transplantation section 4, the hair bundle 3 and the planted hair bundle 3 are planted. Leakage of the filler can be prevented from the gap with the pore 41. In addition, it is possible to stabilize the flocking of the hair bundle 3 and to prevent the hair 30 from being disturbed in the hair bundle 3.

It is preferable to use the same material as the flocked base 41 (brush main body) for the filler.
If it is a material which can obtain desired adhesiveness with respect to the flocked base 41, it can also be filled with a filler different from the material of the flocked base 41. In this case, it is necessary to select a material with good thermal adhesiveness in consideration of the adhesiveness with the flocked base 41.

  In consideration of operability in the oral cavity, the thickness t (see FIG. 2A) of the flocked portion 4 is preferably 3 to 5 mm.

  As shown in FIG. 2 (b), the toothbrush 1 is provided with the above-described hair flocking structure on both sides of the flocking portion 4 in two vertical rows at predetermined intervals. In adjacent vertical rows, the hair bundles 3 are arranged so that the curved surface portion 3B faces in the opposite direction. As a result, a recess 3c having a size capable of covering the tooth surface from both sides by the pair of curved surface portions 3B is formed at the tip of the hair bundle 3 for both ends. In addition, the tip of the hair bundle 3 can be simultaneously brought into contact with the tooth surface over a wider range. At the same time, the tip of the hair on the flat surface portion 3A is more likely to enter the interdental region, and the tip of the hair is more likely to hit the boundary between the teeth and gums, in addition to preventing tooth decay by a good cleaning effect, and gum massage An effect is obtained.

  In addition, the hair bundle 3 can be planted by inclining the hair bundle 3 in order to adjust the spread of the concave portion 3c between adjacent columns. This inclination angle (angle β (see FIG. 3A) with respect to the base surface 410 of the flocked base 41) is preferably 0 to 15 °.

  In addition, the toothbrushes 1 are arranged in a staggered pattern so that the bristle bundles are positioned between each other in adjacent vertical rows. By arranging the hair bundles 3 in this way, it is possible to effectively avoid mutual interference even when the hairs constituting each hair bundle bend in the vertical and horizontal rows during the brushing. , Improve the degree of freedom of movement of the hair, absorb the difference in curvature between the curved surface portion of the hair bundle and the curved surface of the tooth surface, thereby further improving the fit to the tooth surface of the tip of the hair bundle Making it possible.

  Next, the manufacturing method of the toothbrush will be described.

  In the toothbrush manufacturing method of the present embodiment, first, in the step of forming the toothbrush body, the toothbrush body 2 having the flocked base 41 at the tip as shown in FIG. 4A is formed. In the molding process of the toothbrush main body 2, a molding die 10 having a cavity 11 (see FIG. 4B) corresponding to the shape of the toothbrush main body 2 having the flocked base 41 and a resin injection path 12 leading to the cavity 11 is used. Then, the molding die 10 is set in an injection molding apparatus (not shown), and a thermoplastic resin (not shown) is injected in a molten state from the resin injection path 12 into the cavity 11 with a predetermined injection molding pressure. Demold after cooling.

  Next, as shown in FIG. 5, the flocked base 41 is positioned and fixed on the hair bundle holding jig 13 having the insertion portion 130 corresponding to the flocked hole 40. Then, a predetermined number of hair bundles 3 cut into a predetermined length are introduced into the sleeve 14 in advance, and the hair bundle 3 is pushed out by the push pin 15 and inserted into the flock hole 40 and the insertion portion 130.

As shown in FIG. 6, it is preferable to use an extrusion pin 15 having a tip portion 15 a provided in a shape corresponding to the shape of the tip portion of the insertion portion.
When the push pin 15 is inserted into the sleeve 14 and the hair bundle 3 is pushed out, the rear end portion of the hair bundle 3 is aligned by the tip portion 15a of the push pin 15 so that the tip portion of the hair bundle 3 is By aligning and inserting into the insertion portion 130 through the flock hole 40, the tip of the hair bundle can be made into a desired form.

  After inserting all the hair bundles 3 into the flock holes 40, as shown in FIG. 7, in the thermal processing step, each one end portion of the hair bundle 3 protruding from the flock holes 40 is heated by the heat source 16, One end is melted to form a molten mass 31.

  Next, as shown in FIG. 8, in the melt lump coating step, the back side of the flocked base 41 is filled with a filler to cover the molten lump 31 and solidify to form a covering portion 42, thereby flocking the flock The hair transplantation part 4 in which the bristle bundle 3 is fixed to the base part 41 is formed.

  After the formation of the hair transplant part 4, the hair bundle holding jig 13 is removed from the molding device 17. Then, the toothbrush 1 is detached from the bristle bundle holding jig 13, and after the post-processing such as trimming is performed as necessary, the manufacture of the toothbrush 1 is completed.

  As described above, the bristle structure of the hair of this embodiment and the toothbrush 1 having the same are easily fitted to the tooth surface, have an excellent brushing effect, and have an excellent massage effect for gums. It is.

  FIGS. 9-11 is a figure (FIG. 3 equivalent view) which shows the principal part of the toothbrush provided with other embodiment of the flocking structure of the hair of this invention. In these drawings, portions common to the toothbrush of the first embodiment are denoted by the same reference numerals and description thereof is omitted. Accordingly, the description of the first embodiment is appropriately applied to points that are not particularly described.

  The toothbrush 1 shown in FIG. 9 includes a bristle flocking structure having an inclined surface portion 3D instead of the curved surface portion 3B of the bristle bundle 3 of the first embodiment. In this case, the angle γ of the slope portion with respect to the axial direction of the hair 30 is preferably 10 to 60 °, particularly preferably 15 to 45 °. By setting the inclination angle γ within this range, it is preferable to obtain a toothbrush having an excellent brushing effect and having a massaging effect on the gums, with the bristles of the bristles 3 easily fitting to the tooth surface.

  The toothbrush shown in FIG. 10 is provided with a bristle flocking structure having slope portions 3E before and after the front end portion of the bristle bundle, instead of the curved surface portion 3B of the bristle bundle 3 of the first embodiment. is there. In this case, the inclination angle γ of the slope portion is preferably 10 to 60 °, particularly preferably 15 to 45 °. By setting the inclination angle γ within this range, it is preferable to obtain a toothbrush having an excellent brushing effect and having a massaging effect on the gums, with the bristles of the bristles 3 easily fitting to the tooth surface.

  The brush shown in FIG. 11 has a flocking structure for hair having a curved surface portion 3F having a convex arcuate contour on the upper side instead of the curved surface portion 3B in the hair bundle 3 of the first embodiment. It is. In this case, the curvature radius of the curved surface portion 3F is preferably 0.5 to 5.0 mm, particularly preferably 1.0 to 2.5 mm. By setting the radius of curvature within this range, the bristles of the bristles 3 are easily fitted to the tooth surface, excellent in the brushing effect, and preferable as a toothbrush having a gum massage effect.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the present invention.

  For example, in each of the above embodiments, the hair bundle having the flocking structure of the present invention has a substantially elliptical cross section, but the cross section of the hair bundle has a circular shape, an oval shape, an elliptical shape, a triangular shape, a rectangular shape, and other various shapes. Other cross-sectional shapes such as a square shape can also be used. The cross-sectional shape of the hair bundle can be appropriately set by changing the cross-sectional shape and dimensions of the flock hole into which the hair is inserted.

  In the present invention, the hair is inserted into the insertion hole and the insertion portion of the hair bundle holding jig using the extrusion pin through the flock hole of the flocking base portion. It is not limited. For example, the insertion hole of a jig having a plurality of insertion holes, such as a hair bundle insertion hole provided in a mold constituting the cavity of the flocking portion of the toothbrush, and a plurality of hair bundles oriented in a predetermined direction Etc. can also be the insertion target of the hair bundle.

  Hereinafter, the present invention will be described more specifically with reference to examples. In addition, this invention is not restrict | limited at all by this Example.

  Toothbrushes were produced as in Examples 1 to 4 and Comparative Examples 1 to 4 below. And the obtained toothbrush was evaluated as follows.

[Example 1]
The tip of the flocking hole has a flocking hole base having a total of 24 pitching dimensions (distance between the flocking hole centers) in a vertical row with a spacing of 2.7 mm and four in a horizontal row with a spacing of 2.7 mm. A polypropylene brush body was molded. Next, the following hair bundle is inserted into the flocked hole, one end of the protruding hair bundle is melted with a heat source to form a molten mass, and a filler (polypropylene) is filled so as to cover the molten mass Then, the hair bundle was fixed. Further, each of the flock holes is formed by aligning the hair tips of the hairs, and a flat surface portion having the following total cross-sectional area A1 and a curved surface portion in which the length of the hair tips of the hairs gradually changes from the flat surface portions. A toothbrush was obtained in which the hair bundle was implanted so as to have. In addition, the hair height H (refer figure) of the hair in the said flat surface part was 11 mm.
Planted hole: depth 2 mm, cross-sectional area 1.623 mm ² , cross-sectional shape (0.8 × 2.2 mm oblong)
Hair bundle: 8 mil (203 μm) × 36 Hair material: Nylon Total cross-sectional area A1: 0.195 mm ²
The cross-sectional area ratio A1 / A0: 0.167
Angle: 35 °

[Example 2]
The hair bundle was planted so as to have a flat surface portion having the following total cross-sectional area A1 and an inclined surface portion in which the length of the bristles of the hair gradually changes from the flat surface portion, and the following cross-sectional area ratio was carried out. A toothbrush was produced in the same manner as in Example 1.
Total cross-sectional area A1: 0.195 mm ²
Cross-sectional area ratio A1 / A0: 0.167
Tilt angle: 35 °

Example 3
The hair bundle was planted so as to have a flat surface portion having the following total cross-sectional area A1 and an inclined surface portion in which the length of the bristles of the hair gradually changes from the flat surface portion, and the following cross-sectional area ratio was carried out. A toothbrush was produced in the same manner as in Example 1.
Total cross-sectional area A1: 0.06mm ²
Cross-sectional area ratio A1 / A0: 0.06
Inclination angle: 40 °

Example 4
The hair bundle was planted so as to have a flat surface portion having the following total cross-sectional area A1 and an inclined surface portion in which the length of the bristles of the hair gradually changes from the flat surface portion, and the following cross-sectional area ratio was carried out. A toothbrush was produced in the same manner as in Example 1.
Total cross-sectional area A1: 0.681mm ²
Cross-sectional area ratio A1 / A0: 0.6
Tilt angle: 25 °

[Comparative Example 1]
A toothbrush was prepared in the same manner as in Example 1 except that the flocked hole was changed as described below, and all the bristles of the following hair bundle were aligned to the flocked hole so that the hair length was 11.0 mm. did.
Planted hole: depth 3.0 mm, cross-sectional area 2.1 mm ² , cross-sectional shape (circular with an inner diameter of 1.6 mm)
Total cross-sectional area A1: 1.167mm ²
Cross-sectional area ratio A1 / A0: 1

[Comparative Example 2]
A toothbrush was prepared in the same manner as in Comparative Example 1 except that the hair was aligned and planted so that the hair tips of the bristles were 9, 10 and 11 mm.

[Comparative Example 3]
Toothbrush in the same manner as in Example 1 except that the tips of the hairs planted in the flock holes are aligned at a height of 9, 10, and 11 mm to form a flat surface portion (no curved surface portion and inclined surface portion). Was made.
Total cross-sectional area A1: 0.357 mm ²
The cross-sectional area ratio A1 / A0: 0.36

[Comparative Example 4]
A toothbrush was prepared in the same manner as in Example 1 except that the bristles of the bristles were cut into a mountain-shaped inclined surface so as not to have a flat surface portion.
Total cross-sectional area A1: 0 mm ²
The cross-sectional area ratio A1 / A0: 0
Inclination angle: 48 °

[Evaluation of toothbrush]
The obtained toothbrush was subjected to a hearing survey using evaluation items such as a feeling of fitting to the tooth surface, a feeling of reaching the gap, an effect of removing dirt from the gap, and a soft feel to the gums. Then, “○” indicates that there are 8 or more people out of 10 who feel each evaluation item, “△” indicates that there are 5 or more and 7 or less of 10 people, and “×” indicates that 3 or less of 10 people are satisfied. Was evaluated in three stages.

In addition, for the durability of the hair, each toothbrush of Examples 1 to 4 and Comparative Examples 1 to 4 is used by 10 subjects for 1 month each, and the spread of the hair bundle after use causes the toothbrush Durability was evaluated. The evaluation was performed in the following three stages for spreading the hair bundle after use.
○: The shape of the hair bundle projected in the direction of the hair shaft at the tip of the hair bundle can be recognized as being almost similar to the shape of the flock hole, and the axial direction of the hair is almost aligned (the spread of the hair is the flock hole. Less than 1.2 times the dimensions).
(Triangle | delta): Several of the hair | bristle bundle front-end | tip parts incline with respect to the hair | bristle bundle axis | shaft direction, and the spread of hair is 1.2 times or more and 1.7 times or less of the flock hole size.
X: Some or many of the front ends of the hair bundles are inclined with respect to the direction of the hair bundle axis, and the spread of the hair exceeds 1.7 times the flock hole size, or the flock hole shape cannot be recognized.
The results are shown in Table 1.

  As shown in Table 1, the toothbrushes of Examples 1 to 4 (the present invention), in particular, the toothbrushes of Examples 1 and 2 can be easily fitted to individual tooth surfaces, and have excellent brushing effects. It was. It also had a gum massage effect (soft feel on the gums). On the other hand, all of the toothbrushes of the comparative examples were inferior in any of the feeling of fitting to the tooth surface, the feeling of reaching the gap, the effect of removing dirt from the gap, and the soft feel of the gums. All of the toothbrushes of this example were excellent in the durability of bristles.

It is a side view which shows typically 1st Embodiment of the toothbrush provided with the flocking structure of the hair of this invention. It is a figure which shows typically the form of the front-end | tip part of the toothbrush main body in the embodiment, (a) is principal part sectional drawing, (b) is the top view seen from the front end side of the bristle bundle. It is a figure which shows typically the flocking structure of the hair in the embodiment, (a) is principal part sectional drawing, (b) is the top view seen from the front end side of the hair bundle. It is a figure which shows typically the toothbrush main body and molding die used in manufacture of the said toothbrush, (a) is a sectional side view of a toothbrush main body, (b) is a sectional side view of a shaping die. It is principal part sectional drawing which shows typically the insertion process of the hair | bristle bundle in the same embodiment. It is a principal part expanded sectional view which shows typically the insertion state of the hair bundle by the sleeve which performs insertion of the hair bundle, and an extrusion means. It is principal part sectional drawing which shows typically the heat processing process in the embodiment. It is principal part sectional drawing which shows typically the coating process of the molten lump in the embodiment. It is a figure (a figure equivalent to Drawing 3) showing a toothbrush provided with a 2nd embodiment of the hair flocking structure of the hair for the present invention, (a) is a principal section side sectional view, and (b) is a bristle bundle. It is the top view seen from the front end side. It is a figure (a figure equivalent to Drawing 3) showing a toothbrush provided with a 3rd embodiment of the hair flocking structure of the hair for the present invention, (a) is a principal section side sectional view, and (b) is a bristle bundle. It is the top view seen from the front end side. It is a figure (a figure equivalent to Drawing 3) showing a toothbrush provided with a 4th embodiment of the hair flocking structure of the hair of the present invention (a) is principal part side sectional view, (b) is a hair bundle It is the top view seen from the front end side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Toothbrush 2 Brush main body 20 Neck part 3 Hair bundle 30 Hair 3A Flat surface part 3B, 3F Curved surface part 3C Recessed part 3D, 3E Inclined surface part

Claims (7)

It is a flocking structure of hair that is flocked to the flocked part of the toothbrush,
A flat surface portion formed by aligning the hair tips of the hair at the tip of a hair bundle composed of a plurality of hairs, and a curve in which the length of the hair tips of the hair gradually changes from the flat surface portion A flocking structure for hair having a surface portion or an inclined surface portion. Flocking structure of hair use of claim 1 wherein the total cross-sectional area A1 of use hair is 0.12～2.5Mm ² forming the flat surface portion.   The flocking structure for hair according to claim 1 or 2, wherein the ratio (A1 / A0) of the total hair cross-sectional area A0 to the total cross-sectional area A1 of the hair bundle is 0.05 to 0.4.   The angle between the straight line connecting the contour of the curved surface portion when viewed from the side and the length direction of the hair is 10 to 60 °, and the curvature radius of the contour is 0.5 to 5.0 mm. A flocking structure for hair according to any one of claims 1 to 3.   The hair flocking structure for hair according to any one of claims 1 to 3, wherein an angle of the inclined surface portion with respect to a length direction of the hair is 10 to 60 °.   The toothbrush provided with the flocking structure of the hair in any one of Claims 1-5.   A toothbrush comprising the flocked structure on both sides of the flocked portion.

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