TWI802701B - Toothbrush - Google Patents

Abstract

The present invention is to provide a toothbrush that has a thin head part with a high feeling of cleaning of back teeth or the like and in which warping of the head portion at the time of flocking and removal of a bristle bundle are suppressed even if most flocking holes formed in the head portion have large diameters. The toothbrush, in which flat-line type flocking is adopted, includes a handle body 1a made of resin including a head portion, in which a thickness of the head portion is 2 mm to 4 mm, a ratio of first flocking holes having a diameter of 1.8 mm or more is 10% or more, and in an area a of the flocking portion in a front view of the head portion, if the sum of volumes of the first flocking holes and second flocking holes occupying an area A from a flocking surface to a back surface to a depth of 1 mm is defined as V_A (mm³) and the volume of a resin portion occupying an area B from the back surface to the depth 1 mm from the back surface is defined as V_B (mm³), V_A/V_B is 0.50 to 1.00.

Description

toothbrush

The present invention relates to a toothbrush.

This application claims priority based on Japanese Patent Application No. 2018-105171 filed in Japan on May 31, 2018, the contents of which are incorporated herein by reference.

A toothbrush having a thin head with a thickness of about 2 mm to 3 mm is known as a toothbrush that improves the operability in the oral cavity and improves the cleaning feeling of narrow parts such as molars in the oral cavity (Patent Document 1). In addition, as a toothbrush capable of gently massaging the gums, a toothbrush having large-diameter bristle bundles with a diameter of 1.8 mm or more that easily disperses brushing pressure is known (Patent Document 2).

[Prior art literature]

[Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. 2011-4852

[Patent Document 2] Japanese Patent Laid-Open No. 2012-34844

However, a plurality of large-diameter hair transplant holes are formed in the thin-walled head, and it is difficult to achieve both the effect of cleaning the molars and the like and improving the massage effect of the gums. if at The thin-walled head forms many large-diameter hair-planting holes, and the handle tends to warp from the boundary between the head and the neck during hair-planting, especially in the head area. Therefore, the usability of the toothbrush is reduced. . In addition, the force to hold the hair bundles in the large-diameter hair-implantation holes decreases, so the hair bundles tend to fall off during use.

The object of the present invention is to provide a toothbrush which includes a thin-walled head, which has a high cleaning effect on molars and the like, and even if most of the hair-planting holes formed in the head are large in diameter, the warping of the head and the hair bundles during hair-planting are prevented. shedding was also suppressed.

The present invention has the following constitutions.

[1] A toothbrush comprising a resin-made handle, the resin-made handle includes a head with a plurality of hair-planting holes on the hair-planting surface, and the toothbrush is provided with In each of the hair-planting holes, a hair-planting portion with a bundle of hairs is planted, the thickness of the head is not less than 2 mm and not more than 4 mm, and the diameter is relative to the total number of the hair-planting holes provided on the hair-planting surface. The ratio of the total number of hair-planting holes of 1.8 mm or more is 10% or more, and when the hair-planting holes are viewed from the front of the head, the area a of the hair-planting part is from the hair-planting surface toward the back to the The sum of the volumes occupied by the region A up to a depth of 1 mm is V _A (mm ³ ), and the volume occupied by the resin part in the region B from the back surface to the flocking surface to a depth of 1 mm is defined as For V _B (mm ³ ), V _A /V _B is not less than 0.50 and not more than 1.00.

[2] The toothbrush according to [1], wherein the volume ratio of the tuft hole per 1 cm ² in the region A is 35 mm ³ /cm ² or more and 60 mm ³ /cm ² or less.

[3] The toothbrush according to [1] or [2], wherein the volume ratio of the resin portion per 1 cm ² of the area B in a front view is 65 mm ³ /cm ² or more and 85 mm ³ /cm ² or less.

[4] The toothbrush according to any one of [1] or [2], wherein the sum of the volumes occupied by the hair-planting holes in the area C from the hair-planting surface to a depth of 1 mm in the area b When V _C (mm ³ ) is assumed and the volume occupied by the resin portion in the region D from the back surface to a depth of 1 mm is V _D (mm ³ ), the value of V _C /V _D is V _A /V _B More than 0.60 times and less than 0.85 times of the value of , wherein, the region b is surrounded by the outline of the head, and from the short axis tangent to the front end of the hair transplantation hole closest to the front end when the head is viewed from the front The area from the straight line in the direction to the straight line in the short axis direction that is tangent to the rear end of the hair planting hole closest to the rear end.

[5] The toothbrush according to any one of [1] or [2], wherein a plurality of brushes with a diameter of 1.8 mm or more arranged in the long axis direction are respectively formed on both sides of the short axis direction of the flocking surface. The first hair-planting hole, and a plurality of second hair-planting holes with a diameter of less than 1.8 mm arranged in the long-axis direction are formed on the inner side of the first hair-planting hole in the short-axis direction of the hair-planting surface.

The toothbrush of the present invention has a thin-walled head, and has a high cleaning effect on molars and the like, and even if most of the hair-planting holes formed in the head are large in diameter, warping of the head and shedding of hair bundles during hair-planting are suppressed.

1: Toothbrush

1a: Handle body

1A~1H: Toothbrush

10: head

10a: Flocking surface

10b: Back

10c: Resin part

11a: The first hair planting hole

11b: The second hair planting hole

12: Neck

14: handle

15: toothbrush bristles

16a: The first hair bundle

16b: the second hair bundle

18: Hair planting department

20: flat line

a, b, A, B, C, D: area

d. L1: Distance

k: extension cord

p, q: straight line

s: point

Fig. 1 is a front view showing an example of the toothbrush of the present invention.

Fig. 2 is an enlarged front view of the head of the toothbrush of Fig. 1 . Furthermore, hair bundles and flat lines are omitted.

Fig. 3 is a front view showing a region a of the head. Furthermore, hair bundles and flat lines are omitted.

Fig. 4 is a front view showing a region b of the head. Furthermore, hair bundles and flat lines are omitted.

Fig. 5 is an I-I sectional view of the toothbrush of Fig. 2 . Furthermore, hair bundles and flat lines are omitted.

Fig. 6 is a II-II sectional view of the toothbrush of Fig. 2 . Furthermore, hair bundles and flat lines are omitted.

Fig. 7 is a cross-sectional view showing a state in which a hair bundle is planted in a hair-implantation hole formed on a hair-implantation surface.

Fig. 8 is a front view showing another example of the toothbrush of the present invention.

Fig. 9 is a front view showing another example of the toothbrush of the present invention.

Fig. 10 is a front view showing another example of the toothbrush of the present invention.

Fig. 11 is a front view showing another example of the toothbrush of the present invention.

Fig. 12 is a front view showing another example of the toothbrush of the present invention.

Fig. 13 is a front view showing another example of the toothbrush of the present invention.

Fig. 14 is a front view showing another example of the toothbrush of the present invention.

Fig. 15 is a front view showing another example of the toothbrush of the present invention.

Fig. 16 is a hair transplant for explaining the evaluation method of the warpage of the toothbrush in the example Front side view of a toothbrush.

Fig. 17 is a side view of a toothbrush after hair transplantation for explaining the evaluation method of the warpage of the toothbrush in Examples. Furthermore, hair bundles and flat lines are omitted.

Hereinafter, an example of the toothbrush of the present invention will be shown and described in detail. In addition, the dimension etc. of the drawing shown in the following description are an example, and this invention is not necessarily limited to these, It can change suitably in the range which does not change the summary, and can implement.

The toothbrush 1 of this embodiment is equipped with the handle body 1a made of resin, as shown in FIG.1, FIG.5, and FIG.6. The handle body 1 a is formed by a head 10 , a neck 12 , and a handle 14 .

The neck portion 12 extends in contact with the rear end side of the head portion 10 in the longitudinal direction. The neck 12 is a part connecting the handle 14 and the head 10 .

The handle 14 extends and contacts the rear end side of the neck 12 in the longitudinal direction. The handle 14 is the part held by the user.

The handle body 1 a may be formed by integrally molding the head 10 , the neck 12 , and the handle 14 , or may be formed by separately forming and joining any one of them.

In the present invention, if the distance in the long axis direction between the front end of the outer edge of the tufting hole arranged on the most front end side and the front end of the head is L1 (Fig. 2), then the rear end of the head is from the most end side. The rear end of the outer edge of the tuft transplantation hole is at a distance L1 from the rear end side in the long axis direction.

The head 10 has a flocking surface 10a on one side in the thickness direction.

A plurality of circular first hair-planting holes 11 a and second hair-planting holes 11 b are formed on the hair-planting surface 10 a of the head 10 . A hair-implanted part 18 is provided on the head part 10 of the toothbrush 1 . for hair transplantation In the part 18, the first hair bundle 16a is planted in each of the plurality of first hair-planting holes 11a, and the second hair bundle 16b is planted in each of the plurality of second hair-planting holes 11b.

The thickness of the head portion 10 is not less than 2 mm and not more than 4 mm, preferably not less than 2.5 mm and not more than 3.5 mm. When the thickness of the head part 10 is below the upper limit of the said range, the toothbrush 1 will be excellent in the operability in the oral cavity, and the cleaning feeling of the narrow part in oral cavity, such as a molar, will be high. If the thickness of the head 10 is more than the lower limit value of the above-mentioned range, even if most of the hair transplantation holes formed on the head have a large diameter of 1.8 mm or more, warping of the head and hair bundles during hair transplantation can be suppressed. fall off.

Furthermore, the range of the thickness of the head means that the thickness is within the range no matter where the head is measured.

The width of the head 10 is preferably 6mm-16mm, more preferably 8mm-15mm, particularly preferably 10mm-12mm. If the width of the head 10 is more than the lower limit of the above-mentioned range, it is easy to provide a plurality of large-diameter tufting holes with a diameter of 1.8 mm or more in the direction of the short axis of the head, thereby effectively utilizing the large-diameter tufts. A toothbrush that is tight and massages the gums with a high sense of reality. In addition, even if a plurality of large-diameter tuft holes are arranged in the short-axis direction, it is easy to secure a sufficient pitch of the tuft holes, so it is easy to suppress warping of the head. When the width of the head portion 10 is not more than the upper limit value of the above-mentioned range, the intraoral operability, which is an advantage of a thin-walled head portion, is less likely to be impaired.

Furthermore, the range of the width of the head means that the maximum width of the head is within the range. In addition, in this specification, the numerical range represented by "~" means the numerical range which includes the numerical value before and after ~ as a lower limit and an upper limit.

The length of the head 10 is preferably 10mm~33mm, more preferably 12mm ~28mm. If the length of the head 10 is more than the lower limit of the above-mentioned range, a plurality of large-diameter tufting holes can be provided in the long axis direction of the head, and a toothbrush with a high quality of massaging the gums can be provided. In addition, even if a plurality of large-diameter tufting holes are arranged in the long-axis direction, it is easy to secure a sufficient pitch of the tufting holes, and thus it is easy to suppress warping of the head. When the length of the head part 10 is below the upper limit value of the said range, the advantage of a thin-walled head part, ie, the operability in the oral cavity is less likely to be impaired.

The thickness of the back of the head 10 is preferably 0.3 mm to 0.6 mm, more preferably 0.4 mm to 0.5 mm. When the back surface thickness of the head part 10 is more than the lower limit value of the said range, it becomes easy to suppress the warping of the head part 10. If the thickness of the back of the head 10 is below the upper limit of the range, the thickness of the head becomes thinner accordingly, so that the advantage of a thin head, that is, the operability in the oral cavity is not impaired.

Furthermore, the so-called back thickness of the head means the distance from the back of the head to the bottom of the hair transplantation hole. The back of the head means the surface of the head that is on the opposite side to the hair-implanted surface. The back thickness of the head means that the back thickness is within the above-mentioned range no matter where the head is measured.

In the present invention, the plurality of hair-planting holes formed on the hair-planting surface of the head may be a single-diameter hair-planting hole, or may be a combination of hair-planting holes with different diameters. When combining the hair-planting holes with different diameters, it is preferable to make the diameter of the hair-planting holes arranged in the long-axis direction uniform. If the diameters of the hair-planting holes arranged in the long-axis direction are consistent, the hair bundles of the same thickness are arranged in the long-axis direction. Therefore, the degree of bending of each hair bundle becomes uniform when brushing teeth, and it is easy to improve the real feeling of massaging the gums. . In addition, in terms of easily obtaining a real feeling of massaging the gums, it is preferable to use a brush that is easy to disperse the brushing pressure. The hair-planting holes with larger diameters are arranged on the outside in the direction of the short axis. In addition, in order to further improve the cleaning feeling of the molars by effectively utilizing the thin-walled head, and to coexist with the above-mentioned massage feeling, it is preferable to arrange the small-diameter hair bundles that bear the cleaning effect in the minor axis direction. inside. In addition, the short-axis direction is a direction parallel to the flocking surface and perpendicular to the long-axis direction.

The arrangement pattern of the hair-planting holes is not particularly limited, and examples include a zigzag shape and a lattice shape.

In this example, as shown in FIG. 2, five first plantings with a diameter of 1.8 mm or more arranged in the long axis direction are respectively formed on each side of the short axis direction of the hair planting surface 10a of the head 10. Pore 11a. A total of 17 second tufting holes 11b with a diameter of less than 1.8 mm are formed in three rows in the long axis direction at the central portion of the first tufting hole 11a in the minor axis direction of the tufting surface 10a. The second hair-planting holes 11b are formed in a zigzag shape.

The diameter of the large-diameter first hair-planting hole 11 a having a diameter of 1.8 mm or more is preferably 1.8 mm to 3.2 mm, more preferably 2.0 mm to 2.5 mm. When the diameter of the 1st hair-planting hole 11a is more than the lower limit of the said range, the massaging feeling to a gum will improve. If the diameter of the first hair-planting hole 11a is below the upper limit of the range, when the hair bundle is planted, the folded-back part of the hair bundle under the flat line will not become too thick, and the flat hair bundle can be formed in the depth direction of the hair-planting hole. The thread penetrates deeply, so it can suppress the shedding of hair bundles.

The diameters of the large-diameter tuft-planting holes arranged in the long-axis direction are preferably the same.

The diameter of the small-diameter second hair-planting hole 11 b having a diameter of less than 1.8 mm is preferably 1.0 mm to 1.7 mm, more preferably 1.2 mm to 1.5 mm. If the diameter of the second hair-planting hole 11b is more than the lower limit of the range, it is possible to ensure the required amount of decal cleaning. The stiffness of the hair bundle. When the diameter of the 2nd tuft-planting hole 11b is below the upper limit of the said range, the moderate hair bundle bending required for decal cleaning can be ensured.

The diameters of the small-diameter tuft-planting holes arranged in the long-axis direction are preferably the same.

Furthermore, when the shape of the hair-planting hole is circular when facing up, the diameter of the hair-planting hole is its diameter; The diameter of the circumscribed circle of the vesicle hole.

In the present invention, the ratio of the total number of large-diameter tufting holes with a diameter of 1.8 mm or more to the total number of tufting holes provided on the tufting surface (hereinafter also referred to as "ratio P") is set to 10%. above. In the toothbrush 1 of the present embodiment, the proportion P is 34%. By setting the ratio P to 10% or more, the real feeling of massaging the gums improves. The upper limit of the ratio P is 100%.

The lower limit of the ratio P is 10% or more, preferably 20% or more, more preferably 30% or more. The upper limit of the ratio P is 100%, preferably 80% or less, more preferably 50% or less, most preferably 40% or less. The ratio P is preferably 10%-80%, more preferably 20%-50%, and most preferably 30%-40%. Thereby, the massaging sensation to the gums can be combined with the cleaning of the tartar.

In the present invention, with respect to the total number of the tufting holes provided on the tufting surface, the ratio of the total number of the tufting holes with a diameter of 2.0 mm or more is preferably 10% or more, and the ratio of the total number of the tufting holes with a diameter of 2.0 mm or more More preferably, it is 20% or more, and the ratio of the total number of hair-planting holes with a diameter of 2.0 mm or more is particularly preferably 30% or more. Thereby, it is easy to obtain a real feeling of massaging the gums.

In the present invention, it is preferable to plant hairs with a large diameter of more than 1.8 mm in diameter The holes are arranged on the outside of the short-axis direction of the hair-planting surface of the head along the side edge of the head in the long-axis direction, and are carried out in a manner that the small-diameter hair-planting holes in the center are clamped by the large-diameter hair-planting holes. arrangement. In the toothbrush 1, the second tuft hole 11b in the center is sandwiched by two rows of the first tuft hole 11a formed along the side edge of the head 10 in the longitudinal direction. Thereby, the real feeling of massaging the gums during brushing can be further improved.

Furthermore, in the present invention, one row of paired large-diameter hair-planting holes can be used to clamp the central hair-planting hole, and two rows of paired large-diameter hair-planting holes can also be used to clamp the central hair-planting hole.

The tuft hole formed on the outside in the short axis direction is close to the edge of the head, so the effect of the tuft hole on the deformation given to the head is within the range of 180 degrees on the inside (central portion side) when viewed from the front. On the other hand, the hair transplant hole formed in the central part of the short-axis direction of the head gives deformation in all directions of 360 degrees when viewed from the front. From these, the tuft hole formed in the central part of the short axis direction of the head has a greater influence on the head warpage than the tuft hole formed outside the short axis direction. Therefore, it is preferable to make the depth of the hair-planting hole formed in the central part of the short-axis direction of the head in terms of reducing the deformation given around the hair-planting hole in the central part as much as possible and easily suppressing the warpage of the head. The depth of the hair-planting hole formed on the outside in the short-axis direction is shallower.

In addition, the large-diameter hair-planting hole becomes thicker at the folded-back part of the hair bundle under the flat line when the hair-planting hole is planted. The hole depth can be set shallower than the large-diameter hair-planting hole. Therefore, it is more preferable to form a small-diameter hair-planting hole with a shallow hole depth in the central part of the short-axis direction of the head, and to form a small-diameter hair-planted hole with a deep hole on the outside of the short-axis direction. Large-diameter hair-planting holes. Thereby, even in the thin head, the suppression of warping of the head and the suppression of the shedding of hair bundles can coexist, and furthermore, a real feeling of massaging the gums can also be obtained.

In the case of setting a difference in the depth of the hair-planting holes, the difference in hole depth is preferably within 0.3 mm, more preferably within 0.2 mm. By keeping the difference in hole depth within the above-mentioned range, it is easy to make the suppression of head warpage and the suppression of hair bundle shedding coexist even in a thin head.

Furthermore, in the present invention, a plurality of large-diameter hair-planting holes can also be formed in the central part of the short-axis direction of the hair-planting surface of the head, and small-diameter hair-planting holes can be formed on both sides of the short-axis direction of these large-diameter hair-planting holes. Plant pores.

In the toothbrush of the present invention, the sum of the volumes occupied by the hair-planting holes in the area a of the hair-planting part when the head is viewed from the front, from the hair-planting surface toward the back to a depth of 1 mm, is defined as V _A ( ^mm ). The volume occupied by the resin part in the area B of the hair-implanted part from the back toward the hair-implanted surface to a depth of 1 mm in the area a of the hair-implanted part in front view of the head is V _B (mm ³ ). When V _A and V _B are defined in this way, V _A /V _B is not less than 0.50 and not more than 1.00.

In addition, "area a of the hair transplant part in the front view of the head" is the area which surrounds each hair transplant hole located in the outermost periphery in front view of the head. The surrounding line forming the area a is formed by connecting the common tangent lines of adjacent tufting holes.

When the back surface is tapered so that the thickness of the head becomes thicker toward the rear end, the region B is defined as a region having a depth of 1 mm along the tapered back surface.

In this example, in the region a (Fig. 3) of the first hair-planting hole 11a and the second hair-planting hole 11b of the hair-planting portion 18 when the head 10 is viewed in front, from the hair-planting surface 10a to the region A (Fig. 5) of depth 1mm ) is set to V _A (mm ³ ). In addition, the volume occupied by the resin portion 10c in the region B ( FIG. 5 ) from the back surface 10b to a depth of 1 mm in the region a of the hair-implanted portion 18 in the front view of the head 10 is V _B (mm ³ ).

V _A /V _B is not less than 0.50 and not more than 1.00, preferably not less than 0.52 and not more than 0.93, more preferably not less than 0.52 and not more than 0.80. When V _A /V _B is more than the lower limit value of the said range, a hair bundle will not be easy to fall out from an implanted pore at the time of use. Warpage of the head at the time of hair transplanting will be suppressed that V _A /V _B is below the upper limit of the said range.

The ratio Q _A of the volume of the tuft hole per 1 cm ² in the region A is preferably 35 mm ³ /cm ² to 60 mm 3 /cm ² , more preferably 35 ^{mm 3 /} cm ² to 53 mm ³ /cm ² Not more than 35 mm ³ /cm ² and not more than 47 mm ³ /cm ² are particularly preferable. When ratio Q _A is more than the lower limit value of the said range, high-density hair implantation can be realized, and even in the part where the hair tip can contact a small area, such as the gum of a molar, it can ensure the massaging feeling to a gum. When ratio Q _A is below the upper limit of the said range, it will become easy to suppress the warping of the head at the time of hair transplanting.

In addition, ratio Q _A is calculated|required by dividing _VA ( ^mm3 ) by the area (flocking area) of the area|region a.

The volume ratio Q _B of the resin portion per 1 cm ² in the region B is preferably 65 mm ³ /cm ² to 85 mm ³ /cm ² , more preferably 65 mm ³ /cm ² to 80 mm ³ /cm ² Not more than 70 mm ³ /cm ² and not more than 80 mm ³ /cm ² are particularly preferable. Warpage of the head at the time of hair transplanting will become easy to suppress that ratio _QB is more than the lower limit of the said range. If the ratio Q _B is below the upper limit of the above range, a large-diameter tufting hole can be placed directly above a sufficient back thickness, and a toothbrush with a high quality of massaging the gums can be provided while ensuring the strength of the back.

In addition, ratio _QB is calculated|required by dividing _VB ( ^mm3 ) by the area (flocking area) of the area|region a.

In the toothbrush of the present invention, the straight line in the short axis direction that is surrounded by the contour of the head and is tangent to the rear end of the hair transplanting hole closest to the rear end from the front end of the hair transplanting hole closest to the front end when the head is viewed from the front The area up to the straight line in the short-axis direction of the tangent is referred to as area b. Let V _C (mm ³ ) be the sum of the volumes occupied by the hair-planting holes in the region C from the hair-planting surface toward the back to a depth of 1 mm in the region b of the head. Let the volume occupied by the resin part in the area|region D in the area|region b of a head part toward a hair-implantation surface from the back surface to a depth of 1 mm be _VD ( ^mm3 ). When V _C and V _D are defined in this way, the value of V _C /V _D is preferably not less than 0.60 times and not more than 0.85 times the value of V _A /V _B.

In addition, when the back surface is tapered so that the thickness of the head becomes thicker toward the rear end, the region D is defined as a region along the tapered back surface with a depth of 1 mm.

In this example, as shown in FIG. 4 , when the head 10 is viewed from the front, it will be surrounded by the outline of the head 10 and from the short-axis direction tangential to the front end of the second hair-planting hole 11 b that is the closest to the front-end. The area b is defined as a straight line p in the short axis direction tangent to the rear end of the first tuft hole 11a which is the tuft hole closest to the rear end, that is, the straight line p in the short axis direction. The sum of the volumes occupied by the first hair-planting hole 11a and the second hair-planting hole 11b in the region b of the head 10 from the hair-planting surface 10a to a depth of 1mm in the region C ( FIG. 6 ) is set as V _C (mm ³ ). Let the volume occupied by the resin portion 10c in the region D ( FIG. 6 ) having a depth of 1 mm from the rear surface 10 b in the region b be V _D (mm ³ ).

The value of V _C /V _D is preferably from 0.60 to 0.85 times the value of V _A /V _B , more preferably from 0.65 to 0.85 times, and most preferably from 0.70 to 0.80 times. If the value of V _C /V _D is less than 0.60 times the value of V _A /V _B , the edge width is large, so although warpage occurs compared with the case where V _A /V _B satisfies 0.50 or more and 1.00 or less The degree of inhibition exerted by the range is further suppressed, but at the same time, the width of the head is also increased, so the operability in the oral cavity is reduced. On the other hand, _if the value _of V _C /V _D is greater than 0.85 times the value of V _A /V _B , it is difficult to ensure a sufficient edge width. When the range of 0.50 or more and 1.00 or less is satisfied, the degree of suppression exhibited is the same level, and further suppression cannot be expected.

V _C /V _D is preferably from 0.35 to 0.75, more preferably from 0.37 to 0.68.

As a material of the handle body 1a, a resin having a flexural modulus (Japanese Industrial Standards (JIS) K7171) of 1500 MPa or more is preferable. The flexural modulus of the resin used as the material of the shank 1 a is more preferably from 1500 MPa to 3000 MPa, particularly preferably from 2000 MPa to 2700 MPa. When the flexural modulus of the resin is equal to or greater than the lower limit value, it is easy to suppress warpage of the head 10 . If the flexural modulus of the resin is equal to or less than the above upper limit, the neck portion 12 will be moderately bent during brushing, thereby improving the real feeling of massaging the gums. In addition, the followability of the hair tip to the tooth row can be improved, so that teeth can be brushed efficiently.

Preferred resins used as the material of the handle body 1a can be exemplified: polypropylene (Polypropylene, PP), polyoxymethylene (Polyoxymethylene, POM), polybutylene terephthalate (Polybutylene terephthalate, PBT), polyparaphenylene Polyethylene terephthalate (PET), polycyclohexylene dimethylene terephthalate (PCT), and POM are particularly preferred in terms of resin strength.

The resin used as the material of the handle body 1a may be one kind, or two or more kinds.

In order to improve grip, the handle body can also be partly or entirely covered with soft resin such as elastomer. As the flexible resin, in terms of improving the adhesiveness, if it is PP, it is preferably an olefin-based elastomer, and if it is POM, it is preferably a styrene-based elastomer.

The overall length of the handle body 1a can be appropriately determined in consideration of operability and the like, and is, for example, about 100 mm to 200 mm.

In the toothbrush 1, as shown in FIG. 7 , in the first hair-planting hole 11a and the second hair-planting hole 11b, the first hair-planting hole 11a and the second hair-planting hole 11b are implanted with a plurality of toothbrush hairs 15 bundled and folded in half by inserting the flat wire 20 respectively. A hair bundle 16a and a second hair bundle 16b. In this way, the toothbrush of the present invention is a toothbrush with flat-line bristles.

The material of the bristles is not particularly limited, and examples include polyamide (6-12 nylon, 6-10 nylon, 12-nylon, etc.), polyester (polyethylene terephthalate, polyethylene terephthalate, etc.) Butylene formate, polytrimethylene terephthalate, etc.), polyolefin (polypropylene, etc.), elastomers (olefin-based, styrene-based, etc.) and other synthetic resin materials or natural material. The material of toothbrush hair 15 can be one kind, also can be more than two kinds.

The cross-sectional shape of toothbrush bristles is mostly circular, but it is not limited to circular, and may be triangular, quadrangular, hexagonal, petal-shaped, etc., or may be a combination of these shapes. The overall appearance shape of the toothbrush bristles is also not particularly limited, and toothbrush bristles processed into a wave shape, a twist shape, a zigzag shape, or the like can also be used.

The diameter of the toothbrush bristles is preferably 3 mil-12 mil (0.076 mm-0.305 mm), more preferably 5 mil-10 mil (0.127 mm-0.254 mm). Preferably, toothbrush bristles with a small diameter are planted in the large-diameter hair-planting holes. Even if it is a thick bristle bundle, it can bend the bristle bundle during brushing, and can provide a toothbrush with a high quality of massaging the gums.

Furthermore, when the cross-sectional shape of the toothbrush hair is circular, the diameter of the toothbrush hair is its diameter; The diameter of the circumcircle of the cross section.

The toothbrush hairs may be ordinary hairs having substantially the same diameter in one toothbrush hair except for the round portion of the hair tip. In addition, tapered hairs may be sharpened so that the diameter gradually becomes thinner toward the hair tip in the thickness described above in the vicinity of the hair-implanted surface 10a of the head 10 . In this case, the bristle tip penetrates well into the space between the teeth, and soft touch comfort can be realized, so it is suitable for cleaning the neck of the tooth or massaging the gums. In addition, ordinary hairs and tapered hairs can be selected appropriately for individual hair-planting holes, or ordinary hairs and tapered hairs can be mixed in the same hair bundle, and can be freely combined.

The length (hair length) of the bristles from the hair-implanted surface 10a can be appropriately set, for example, about 6 mm to 15 mm. Regarding the hair length of the toothbrush, it is better for adults to be 9 In the range of mm~15mm, it is better for children to be in the range of 6mm~9mm.

What is necessary is just to set the diameter of the 1st hair bundle 16a and the 2nd hair bundle 16b according to the diameter of the 1st hair-planting hole 11a and the 2nd hair-planting hole 11b which implant.

As described above, in the toothbrush of the present invention, the thickness of the head is 2 mm to 4 mm, so it is excellent in operability in the oral cavity and has a high cleaning effect on molars and the like. In addition, by setting the ratio of the pore-planting holes with a diameter of 1.8 mm or more to 10% or more, it is easy to secure effects such as improving the sensation of massaging the gums. Furthermore, V _A /V _B is controlled within a range of not less than 0.50 and not more than 1.00. Thereby, even if many of the hair-planting holes formed in the head have a large diameter, it is possible to suppress warping of the head or falling off of hair bundles at the time of hair-planting.

The reason why the warpage of the head is suppressed at the time of hair transplanting is considered as follows.

In the flat-line hair transplant, the force to expand the hole acts on the hair transplant hole. For this reason, when viewed from the side of the toothbrush, it is easy to form an arched warp that gradually descends from the connection portion of the head and the neck to the front end of the head on the back side. The force to expand the hole increases as it gets closer to the flocking surface, and the larger the volume of the flocking hole, the more it affects a wider area of the surrounding resin portion, so warping tends to occur. In addition, when the head is warped, a force compressing the resin portion is generated at the portion of the head near the back. Therefore, the larger the resin volume, the less likely it is to warp. Control the V _A /V _B within the above range, and adjust the volume of the hair-planting hole near the hair-planting surface and the volume of the resin part near the back to an appropriate range, so that the hair-planting caused by the penetration of the flat wire Head warping is suppressed.

Furthermore, the reason why hair bundle shedding was suppressed is considered as follows.

In the flat-line hair-planting, the larger the hole diameter of the hair-planting hole, the thicker the folded part of the hair-bundle under the flat line becomes when the hair bundle is planted, so it is difficult to place the flat line deeply in the depth direction of the hair-planting hole Intrusion, thus prone to shedding of hair bundles. In order to suppress the shedding of hair bundles, a method of deepening the hole depth of the hair-planting hole is considered, but the reduction of the thickness of the back side caused by this leads to a decrease in the strength of the head. From the above, there is an appropriate range of V _A /V _B in order to suppress hair bundle shedding.

In addition, the toothbrush of this invention is not limited to the toothbrush 1 mentioned above.

For example, in the toothbrush according to the present invention, the back surface may be tapered so that the thickness of the head becomes thicker toward the rear end.

In the toothbrush of the present invention, the number of hair bundles implanted on the hair-implantation surface of the head or the arrangement pattern of the hair-implantation holes are not limited to the number of hair bundles or the arrangement pattern of the hair-implantation holes of the toothbrush 1 . Specifically, the number of hair bundles of the toothbrush according to the present invention or the arrangement pattern of the hair-planting holes may also be in the form of the toothbrush 1A to the toothbrush 1G illustrated in FIGS. 8 to 14 .

As shown in FIG. 15 , the toothbrush of the present invention may also be a toothbrush 1H in which the small-diameter second tuft hole 11b is arranged outside in the short-axis direction, and the large-diameter first tuft-plant hole 11a is arranged inside in the short-axis direction.

Hereinafter, the present invention will be described in detail with examples, but the present invention is not limited by the following description.

[Evaluation of easiness of cleaning of molars]

The sensory test was performed by 10 expert panelists, and the easiness of cleaning the molars (the second largest molars) was evaluated according to the following criteria. The average score of 10 expert reviewers is set as "◎" from 4.0 to 5.0, and from 3.0 to less than 4.0 A score of 2.0 or more and less than 3.0 was set as "△", and a score of less than 2.0 was set as "×". It will be ○ or ◎ or judged to be a toothbrush with high easiness of cleaning molars.

(evaluation criteria)

5 points: Very easy to brush.

4 points: Slightly easy to brush.

3 points: None of them.

2 points: Slightly difficult to brush.

1 point: very difficult to brush.

[Evaluation of the actual feeling of massaging the gums]

A sensory test was conducted by 10 expert panelists, and the real feeling of massaging the gums was evaluated according to the following criteria. The average score of 10 expert reviewers is 4.0 to 5.0 as "◎", 3.0 to less than 4.0 as "○", 2.0 to 3.0 as "△" , set less than 2.0 points as "×". It was judged to be ○ or ◎ or to be a toothbrush with a high feeling of massaging the gums.

(evaluation criteria)

5 points: very felt.

4 points: Slightly felt.

3 points: None of them.

2 points: Nothing felt.

1 point: Not felt at all.

[evaluation of the warping of the head]

As shown in Figure 16, when looking at the side of the toothbrush, the connection between the head 10 and the neck 12 will be made The extension line k obtained by extending the parting line (parting line) of the contact area (the area from the rearmost end of the hair transplantation hole to the smallest diameter of the neck) toward the front end side of the head 10, and the non-warp state before hair transplantation The point of intersection of the extension line k of and the front end surface of the head 10 is set as point s. As shown in FIG. 17, in the toothbrush after the hair transplantation of each example, the distance d between the extension line k and the point s was measured, and it was set as the warpage of the head. The warpage of the head was evaluated according to the following criteria.

(evaluation criteria)

◎: The warpage is 0 mm.

◯: Warpage is more than 0 mm and less than 0.5 mm.

Δ: Warpage is 0.5 mm or more and less than 1.0 mm.

×: The warpage is 1.0 mm or more.

[Resistance to shedding of hair bundles]

Grasp the hair bundles planted in a large-diameter hair-planting hole with a special device, and use a tensile testing machine to measure (tensile speed 20mm/min) (n=10) until the hair bundles fall off from the hair-planting hole The maximum tensile stress (N), based on this value, was used to evaluate the shedding resistance of the hair bundles according to the following criteria.

(evaluation criteria)

⊚: The average value of the maximum tensile stress is 25N or more.

◯: The average value of the maximum tensile stress is 20N or more and less than 25N.

Δ: The average value of the maximum tensile stress is 15N or more and less than 20N.

×: The average value of the maximum tensile stress is less than 15N.

[Example 1]

Using POM (flexural modulus: 2500MPa) as the resin for forming the handle, according to the specifications shown in Table 1 and Table 2, the handle 1a shown in Figures 1 to 6 was produced by injection molding. Fold the bundle of toothbrush bristles made of polybutylene terephthalate (diameter: large hole 5.0 mil, small hole 6.0 mil) into half, and insert the flat wire sandwiched between them into the head In the hair-planting hole, hair bundles are planted, thereby making a toothbrush.

[Example 2~Example 5, Comparative Example 1~Comparative Example 4]

Except having changed to the specification shown in Table 1 and Table 2, it carried out similarly to Example 1, and produced the toothbrush.

Table 1 and Table 2 show the specifications and evaluation results of the toothbrushes of the respective examples. In addition, the "ratio P" in Table 2 is the ratio of the total number of the large-diameter tuft hole whose diameter is 1.8 mm or more with respect to the total number of the tuft hole provided in the tuft surface.

As shown in Table 2, in the toothbrushes of Examples 1 to 5 in which the thickness, ratio P, and V _A /V _B of the head were controlled within the ranges specified in the present invention, warping of the head was suppressed. In addition, there is a high sense of cleaning on the molars and a high sense of massage on the gums, and the hair bundles are not easy to fall off.

In the toothbrush of Comparative Example 1 that does not have a large-diameter tufting hole having a diameter of 1.8 mm or more, the actual feeling of massaging the gums was insufficient compared with the Examples. In the toothbrush of Comparative Example 2 in which V _A /V _B was too large, warpage of the head could not be suppressed. In the toothbrush of Comparative Example 3 in which V _A /V _B was too small, hair bundles tended to fall out. In Comparative Example 4 in which the thickness of the head was too thick, the ease of cleaning the molars was insufficient compared with the Examples.

1: Toothbrush

1a: Handle body

10: head

10a: Flocking surface

10b: Back

10c: Resin part

11a: The first hair planting hole

12: Neck

14: handle

A, B: area

Claims (4)

A toothbrush, which includes a resin handle body, the resin handle body includes a head with a plurality of hair-planting holes on the hair-planting surface, and the toothbrush is provided with a flat wire that is driven into the In each of the hair-planting holes, a hair-planting part with a hair bundle is planted, the thickness of the head is not less than 2 mm and not more than 4 mm, and the diameter is 1.8 mm relative to the total number of the hair-planting holes provided on the hair-planting surface The ratio of the total number of the above hair-planting holes is 10% to 80%, and when the hair-planting holes are viewed from the front of the head, the area (a) of the hair-planting part is from the hair-planting surface toward the back The total volume occupied by the area (A) up to a depth of 1 mm is defined as V _A (mm ³ ), and the volume occupied by the resin portion in the area (B) from the back surface toward the flocking surface to a depth of 1 mm is defined as V A (mm 3 ). When the volume of V _B (mm ³ ), V _A /V _B is 0.50 or more and 1.00 or less, the ratio of the volume of the hair-planting hole per 1 cm ² in front view in the area (A) is 35 mm ³ / cm ² or more and 60 mm ³ /cm ² or less. The toothbrush according to claim 1, wherein the volume ratio of the resin portion per 1 cm ² in front view in the region (B) is not less than 65 mm ³ /cm ² and not more than 85 mm ³ /cm ² . The toothbrush as described in item 1 or item 2 of the scope of the patent application, wherein the sum of the volumes occupied by the hair-planting holes in the area (C) from the hair-planting surface to a depth of 1mm in the area (b) V _C (mm ³ ), and V D (mm ³ ) is the volume occupied by the resin portion in the region (D) from the back surface to a depth of 1 mm. The value of _{V C /} V _D is V The value of _A /V _B is not less than 0.60 times and not more than 0.85 times, wherein the region (b) is surrounded by the outline of the head, and the implant closest to the front end in front view of the head The area from the straight line in the minor axis direction tangent to the front end of the pore to the straight line in the minor axis direction tangential to the rear end of the hair transplantation hole closest to the rear end. The toothbrush as described in item 1 or item 2 of the scope of the patent application, wherein a plurality of first hair-planting holes with a diameter of 1.8 mm or more arranged in the long-axis direction are respectively formed on both sides of the short-axis direction of the said hair-planting surface , and on the inside of the first hair-planting hole in the short-axis direction of the hair-planting surface, a plurality of second hair-planting holes with a diameter of less than 1.8mm arranged in the long-axis direction are formed.

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