CN112153919B - Tooth brush - Google Patents

Abstract

A toothbrush having a thin head part, having a high reliable feeling of cleaning molars and the like, and capable of suppressing warping of the head part and falling-off of tufts during bristle implantation even if a large number of bristle implantation holes formed in the head part have a large diameter. A toothbrush (1) comprises a handle body (1 a) made of resin and having a head (10), wherein bristles are implanted in a flat line, the thickness of the head (10) is 2mm to 4mm, the proportion of a 1 st implanted pore (11 a) having a diameter of 1.8mm is 10% or more, and the sum of the volumes of the 1 st implanted pore (11 a) and a 2 nd implanted pore in a region A extending from a bristle surface (10 a) to a back surface (10 b) to a depth of 1mm in a region a of the implanted pore in a front view of the head (10) is V _A (mm ³ ) V is taken as the volume of the resin portion (10 c) in the region B extending from the back surface (10B) to the bristle-implanted surface (10 a) to a depth of 1mm _B (mm ³ ) When, V _A /V _B Is 0.50 to 1.00 inclusive.

Description

Tooth brush

Technical Field

The present invention relates to toothbrushes.

This application claims priority based on patent application No. 2018-105171, filed in japan on 31/5/2018, the contents of which are incorporated herein by reference.

Background

As a toothbrush for improving the operability of the toothbrush in the oral cavity and the reliable cleaning feeling of narrow parts such as molar teeth in the oral cavity, a toothbrush having a thin head part with a thickness of about 2 to 3mm is known (patent document 1). As a toothbrush capable of massaging gums gently, a toothbrush having large-diameter tufts of 1.8mm or more in diameter, which can easily disperse brushing pressure, is known (patent document 2).

Documents of the prior art

Patent literature

Patent document 1: japanese patent laid-open publication No. 2011-4852

Patent document 2: japanese patent laid-open No. 2012-34844

Disclosure of Invention

Problems to be solved by the invention

However, since a large number of large-diameter hair-implanting holes are formed in a thin head portion, it is difficult to achieve both the effects of ensuring the cleanness of molars and the like and improving the massage feeling of gums. When a large number of large-diameter bristle-implanting holes are formed in a thin head portion, the handle body is liable to warp from the boundary portion of the head portion and the neck portion at the time of bristle implantation, and in particular, warping is liable to be caused in the head portion region, and therefore, the usability of the toothbrush is lowered. In addition, in the large-diameter implant hole, the force of fixing the hair bundle is reduced, and therefore, the hair bundle is liable to fall off in use.

The invention provides a toothbrush, which is provided with a thin head part, has high reliable cleaning feeling of molar teeth and the like, and can inhibit the warping of the head part and the falling of hair bundles during hair implantation even if a large number of hair implantation holes formed on the head part are large in diameter.

Means for solving the problems

The present invention has the following configuration.

[1]A toothbrush comprises a resin handle body having a head part with a plurality of implantation holes on the implantation surface, and flat wires driven into the implantation holes respectivelyImplant ofThe hair-planting part of the hair bundle,

the thickness of the head part is 2mm to 4mm,

the ratio of the total number of implanted pores having a diameter of 1.8mm or more to the total number of implanted pores provided on the implanted surface is 10% or more,

in the area a of the implanted hair part in the front view of the head part, V is taken as the sum of the volumes of the implanted hair holes in the area A from the implanted hair surface to the back surface to the depth of 1mm _A (mm ³ ) V is a volume of a resin portion in a region B extending from the back surface to the flocking surface to a depth of 1mm _B (mm ³ ) When the utility model is used, the water is discharged,

V _A /V _B is 0.50 to 1.00 inclusive.

[2]According to [1]]The toothbrush according to (1), wherein in the region A, each 1cm in front view ² The volume ratio of the implanted pores is 35mm ³ /cm ² Above 60mm ³ /cm ² The following.

[3]According to [1]Or [ 2]]The toothbrush according to (1), wherein in the region B, each 1cm in front view ² Has a volume ratio of the resin portion of 65mm ³ /cm ² Above, 85mm ³ /cm ² The following.

[4]According to [1]～[3]The toothbrush according to any one of the above claims, wherein V is taken as a sum of volumes of the implantation holes in a region C from the implantation surface to a depth of 1mm in a region b from a straight line in a minor axis direction adjacent to a tip of the implantation hole closest to the tip to a straight line in a minor axis direction adjacent to a rear end of the implantation hole closest to the rear end in a front view of the head surrounded by a contour of the head, and wherein V is taken as a sum of volumes of the implantation holes in a region C from the implantation surface to the depth of 1mm _C (mm ³ ) The volume of the resin portion in the region D from the back surface to a depth of 1mm was taken as V _D (mm ³ ) When the temperature of the water is higher than the set temperature,

V _C /V _D has a value of V _A /V _B 0.60 times or more and 0.85 times or less.

[5] The toothbrush according to any one of [1] to [4], wherein a plurality of 1 st implantation pores having a diameter of 1.8mm or more are formed on both sides of the implantation surface in the short axis direction, and a plurality of 2 nd implantation pores having a diameter of less than 1.8mm are formed inside the 1 st implantation pores in the short axis direction of the implantation surface.

Effects of the invention

The invention provides a toothbrush having a thin head part, having a high reliable cleaning feeling of a molar tooth and the like, and capable of suppressing warping of the head part and falling-off of hair bundles at the time of hair implantation even if a large number of hair implantation holes formed in the head part have a large diameter.

Drawings

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

Fig. 2 is an enlarged front view of the head of the toothbrush of fig. 1. In addition, the tufts and the flat wire are omitted.

Fig. 3 shows a front view of the area a in the head. In addition, the tufts and the flat wire are omitted.

Fig. 4 shows a front view of the area b in the head. In addition, the tufts and the flat wire are omitted.

FIG. 5 is an I-I sectional view of the toothbrush of FIG. 2. In addition, the tufts and the flat wire are omitted.

FIG. 6 is a sectional view taken along line II-II of the toothbrush shown in FIG. 2. In addition, the tufts and flat wire are omitted.

FIG. 7 is a sectional view showing a state where a bundle of hairs is implanted in a planting hole formed in a planting surface.

FIG. 8 shows a front view of another embodiment of the toothbrush of the present invention.

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

FIG. 10 shows a front view of another example of the toothbrush of the present invention.

FIG. 11 shows a front view of another example of the toothbrush of the present invention.

FIG. 12 shows a front view of another example of the toothbrush of the present invention.

FIG. 13 shows a front view of another embodiment of the toothbrush of the present invention.

FIG. 14 shows a front view of another embodiment of the toothbrush of the present invention.

FIG. 15 shows a front view of another embodiment of the toothbrush of the present invention.

FIG. 16 is a side view of a toothbrush before bristle implantation in the evaluation method of toothbrush warpage in the example.

FIG. 17 is a side view of a toothbrush after bristle implantation for explaining a method of evaluating warpage of a toothbrush in an example. In addition, the tufts and flat wire are omitted.

Description of the symbols

1 method 8230, a toothbrush 1a method 8230, a handle body 10 method 8230, a head 10a method 8230, a hair planting face 10b method 8230, a back face 10c method 8230, a resin part 11a method 8230, a 1 st hair planting hole 11b method 8230, a 2 nd hair planting hole 12 method 8230, a neck 14 method 8230, a handle 16a method 8230, a 1 st hair bundle 16b method 8230, a 2 nd hair bundle 18 method 30, a hair planting part 20 method 8230and a flat line.

Detailed description of the invention

Hereinafter, an example of the toothbrush of the present invention will be described in detail. The dimensions and the like of the drawings illustrated in the following description are examples, and the present invention is not necessarily limited to these dimensions, and can be implemented with appropriate modifications within a range not changing the gist thereof.

As shown in fig. 1, 5, and 6, the toothbrush 1 of the present embodiment includes a handle body 1a made of resin. The handle body 1a is formed of a head portion 10, a neck portion 12, and a handle portion 14.

The neck portion 12 extends and abuts on the rear end side in the longitudinal direction of the head portion 10. The neck portion 12 is a portion connecting the grip portion 14 and the head portion 10.

The grip portion 14 extends and abuts on the rear end side of the neck portion 12 in the longitudinal direction. The grip portion 14 is a portion gripped by a user.

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

In the present invention, the distance between the tip of the outer edge of the implantation hole arranged on the most distal side and the tip of the head in the longitudinal direction is L1 (fig. 2), and the rear end of the head is located at a position distant from the rear end of the outer edge of the implantation hole on the most distal side to the rear end side in the longitudinal direction by L1.

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

A plurality of circular 1 st and 2 nd implantation holes 11a and 11b are formed in an implantation surface 10a of the head 10. The head 10 of the toothbrush 1 is provided with a bristle-implanted portion 18. In the implanted portion 18, the 1 st hair bundle 16a is implanted in each of the plurality of 1 st implanted holes 11a, and the 2 nd hair bundle 16b is implanted in each of the plurality of 2 nd implanted holes 11b.

The thickness of the head 10 is 2mm to 4mm, preferably 2.5mm to 3.5 mm. When the thickness of the head 10 is equal to or less than the upper limit of the above range, the toothbrush 1 is excellent in the oral cavity operability, and the feeling of reliable cleaning of narrow portions in the oral cavity such as molars is high. When the thickness of the head portion 10 is not less than the lower limit of the above range, even if the diameter of the hair-planting holes formed in the head portion is large, i.e., not less than 1.8mm, the head portion can be prevented from warping and falling of hair bundles during hair-planting.

The thickness range of the head portion is: the thickness measured at any position of the head is within the above range.

The width of the head 10 is preferably 6 to 16mm, more preferably 8 to 15mm, and still more preferably 10 to 12mm. When the width of the head 10 is not less than the lower limit of the above range, it is easy to provide a plurality of large implanted holes having a diameter of not less than 1.8mm in the short axis direction of the head, and a toothbrush having a high feeling of massaging the gums with the large-diameter tufts can be provided. Further, even if a plurality of implantation holes having a large diameter are arranged in the short axis direction, it is easy to secure a sufficient pitch between the implantation holes, and therefore, it is easy to suppress warping of the head. When the width of the head 10 is equal to or less than the upper limit of the above range, the intraoral operability, which is an advantage of a thin head, is hardly impaired.

The range of the width of the head portion means that the maximum width of the head portion is within the above range. In the present specification, the numerical range represented by "to" means a numerical range including numerical values before and after "to" as a lower limit value and an upper limit value.

The length of the head 10 is preferably 10 to 33mm, more preferably 12 to 28mm. When the length of the head 10 is not less than the lower limit of the above range, a plurality of implant holes having a large diameter can be formed in the longitudinal direction of the head, and a toothbrush having a high massaging feeling of the gum can be provided. Further, even if a plurality of implantation holes having a large diameter are arranged in the longitudinal direction, it is easy to secure a sufficient pitch between the implantation holes, and therefore, it is easy to suppress warping of the head. When the length of the head 10 is equal to or less than the upper limit of the above range, the intraoral operability, which is an advantage of a thin head, is hardly impaired.

The back surface thickness of the head 10 is preferably 0.3 to 0.6mm, more preferably 0.4 to 0.5mm. When the back surface thickness of the head portion 10 is equal to or greater than the lower limit of the above range, warpage of the head portion 10 is easily suppressed. When the back thickness of the head 10 is equal to or less than the upper limit of the above range, the thickness of the head is reduced, and therefore, the intraoral operability which is an advantage of a thin head is not impaired.

The thickness of the back surface of the head portion is a distance from the back surface of the head portion to the bottom of the bristle planting hole. The back surface of the head is a surface opposite to the flocked surface in the head. The thickness of the back surface of the head portion is: the back thickness measured at any position of the head is within the above range.

In the present invention, the plurality of hair-planting holes formed in the hair-planting surface of the head may be a single-diameter hair-planting hole or a combination of hair-planting holes having different diameters. When implant holes having different diameters are combined, it is preferable that the implant holes arranged in the longitudinal direction have the same diameter. When the diameters of the implanted holes arranged along the long axis direction are consistent, the hair bundles with the same thickness are arranged along the long axis direction, so that the deflection of each hair bundle is uniform during tooth brushing, and the actual massage feeling of the gum is easy to improve. In addition, from the viewpoint of facilitating the actual feeling of massaging the gums, it is preferable that the tooth brushing pressure be easily dispersed, and the implantation holes having a larger diameter be arranged outside in the short axis direction. In order to further improve the feeling of reliable cleaning using molars with thin heads and to achieve the above-described massage feeling, it is preferable to arrange the small-diameter tufts that provide the cleaning effect on the inner side in the short axis direction. The short axis direction is a direction parallel to the hair-planted surface and perpendicular to the long axis direction.

The arrangement pattern of the implanted pores is not particularly limited, and examples thereof include a staggered pattern and a lattice pattern.

In this example, as shown in fig. 2, 5 first implantation holes 11a having a diameter of 1.8mm or more are formed on both sides of the implantation surface 10a of the head 10 in the short axis direction, respectively. A total of 17 2 nd hair-planting holes 11b having a diameter of less than 1.8mm, which are arranged in 3 rows in the major axis direction, are formed in the center portion of the hair-planting surface 10a on the inner side of the 1 st hair-planting hole 11a in the minor axis direction. The No. 2 hair-planting holes 11b are formed in a staggered manner.

The diameter of the 1 st implantation hole 11a having a large diameter of 1.8mm or more is preferably 1.8 to 3.2mm, more preferably 2.0 to 2.5mm. When the diameter of the 1 st implant hole 11a is equal to or larger than the lower limit of the above range, the massage feeling of the gum is improved. When the diameter of the 1 st implantation hole 11a is equal to or smaller than the upper limit of the above range, the bundle bent portion under the flat wire is not excessively thick at the time of implantation of the bundle, and the flat wire can be deeply driven in the direction of the depth of the implantation hole, and therefore, the falling-off of the bundle can be suppressed.

Preferably, the large diameter implant holes aligned along the long axis have the same diameter.

The diameter of the 2 nd planting hole 11b having a small diameter of less than 1.8mm is preferably 1.0 to 1.7mm, more preferably 1.2 to 1.5mm. When the diameter of the 2 nd implantation hole 11b is equal to or larger than the lower limit of the above range, the stiffness of the bundle of bristles necessary for tartar cleaning can be secured. When the diameter of the 2 nd implantation hole 11b is not more than the upper limit of the above range, it is possible to secure appropriate deflection of the bundle of bristles necessary for cleaning tartar.

Preferably, the small diameter implant holes aligned along the long axis have the same diameter.

In addition, when the shape of the implanted hole in the front view is a circle, the diameter of the implanted hole is the diameter thereof, and when the shape of the implanted hole in the front view is a shape other than a circle, the diameter of a circumscribed circle of the implanted hole is the diameter.

In the present invention, the ratio of the total number of large-diameter implanted pores having a diameter of 1.8mm or more to the total number of implanted pores provided on the implanted surface (hereinafter also referred to as "ratio P") is 10% or more. In the toothbrush 1 of the present embodiment, the ratio P is 34%. By taking the ratio P to be 10% or more, the massaging feeling of the gum becomes high. The upper limit of the proportion P is 100%.

The lower limit of the proportion P is 10% or more, preferably 20% or more, and more preferably 30% or more. The upper limit of the proportion P is 100%, preferably 80% or less, more preferably 50% or less, and still more preferably 40% or less. The proportion P is preferably 10 to 80%, more preferably 20 to 50%, still more preferably 30 to 40%. Therefore, the gum massaging device can have the massage practical feeling of the gum and the tartar cleaning.

In the present invention, the ratio of the total number of implanted pores having a diameter of 2.0mm or more to the total number of implanted pores provided on the implanted surface is preferably 10% or more, the ratio of the total number of implanted pores having a diameter of 2.0mm or more is more preferably 20% or more, and the ratio of the total number of implanted pores having a diameter of 2.0mm or more is further preferably 30% or more. Thereby, the actual feeling of massaging the gum can be easily obtained.

In the present invention, it is preferable that implantation holes having a large diameter of 1.8mm or more are arranged along the side edge of the head in the major axis direction outside the major axis direction of the implantation surface of the head, and the implantation holes having a small diameter in the central portion are sandwiched by the implantation holes having a large diameter. In the toothbrush 1, the central 2 nd implantation hole 11b is sandwiched by 2 rows 1 st implantation holes 11a formed along the side edge of the head 10 in the longitudinal direction. Therefore, the actual feeling of massaging the gum during brushing can be improved.

In the present invention, the two sets of 1 row large-diameter flocking holes may sandwich the central portion flocking hole, or the two sets of 2 row large-diameter flocking holes may sandwich the central portion flocking hole.

Since the hair-planting holes formed on the outer side in the short axis direction are close to the head edge, the influence of the hair-planting holes on the deformation of the head is in the range of 180 degrees in the inner side (center side) in the front view. On the other hand, the hair-planting hole formed in the center of the head in the short axis direction is deformed in all directions of 360 degrees in the front view. In view of these circumstances, the burr hole formed in the center portion of the head in the short axis direction has a greater influence on the warpage of the head than the burr hole formed on the outer side in the short axis direction. Therefore, from the viewpoint that the strain applied to the periphery of the hair-implanted hole in the central portion is as small as possible and the warpage of the head is easily suppressed, the depth of the hair-implanted hole formed in the central portion of the head in the short axis direction is preferably smaller than the depth of the hair-implanted hole formed outside the short axis direction.

When a tuft is implanted into a large-diameter implantation hole, the tuft bent portion under the flat wire is thickened, and therefore, in order to suppress the fall-off of the tuft, the implantation hole needs to be set to a deep depth, but a small-diameter implantation hole may be set to a shallower depth than a large-diameter implantation hole. Therefore, it is more preferable that a small-diameter implantation hole having a shallow depth be formed in the center portion of the head in the short axis direction, and a large-diameter implantation hole having a deeper hole depth than the small-diameter implantation hole be formed outside in the short axis direction. Thus, even in a thin head, the bending of the head and the falling of the hair bundle can be simultaneously suppressed, and the actual feeling of massaging the gum can be further obtained.

When the difference in the depths of the implanted holes is set, the difference in the hole depths is preferably within 0.3mm, more preferably within 0.2 mm. By setting the difference in hole depth within the above range, it is easy to achieve both suppression of warping of the head portion and suppression of falling-off of the hair bundle even in a thin head.

In the present invention, a plurality of implantation holes having a large diameter are formed in the center of the implantation surface of the head in the short axis direction, and implantation holes having a small diameter can be formed on both sides of the implantation holes having a large diameter in the short axis direction.

In the toothbrush of the present invention, in the area a of the bristle-implanted part in the front view of the head, the sum of the volumes of the bristle-implanted holes in the area A extending from the bristle-implanted surface to the back surface to a depth of 1mm is V _A (mm ³ ). The volume of the resin portion in a region B from the back surface to the hair-planted surface up to a depth of 1mm in a region a of the hair-planted portion in the front view of the head portion is taken as V _B (mm ³ ). Thus defining V _A And V _B When, V _A /V _B Is 0.50 to 1.00 inclusive.

In addition, "the area a of the hair-planted portion in the front view of the head" means: in the front view of the head, the area surrounding each implantation hole located at the outermost periphery. The surrounding lines forming the area a connect common tangent lines between adjacent hair-planting holes.

When the back surface is tapered so that the thickness of the head portion gradually increases toward the rear end, the region B is a region having a depth of 1mm along the tapered back surface.

In this example, in a region a (fig. 3) of the implanted part 18 in the front view of the head 10, V is taken as the sum of the volumes of the 1 st implanted hole 11a and the 2 nd implanted hole 11b in a region a (fig. 5) extending from the implanted surface 10a to a depth of 1mm _A (mm ³ ). Further, in a region a of the flocked portion 18 in a front view of the head 10, a volume of the resin portion 10c in a region B (fig. 5) from the back surface 10B up to a depth of 1mm takes V _B (mm ³ )。

V _A /V _B Is 0.50 to 1.00, preferably 0.52 to 0.93, more preferably 0.52 to 0.80. V _A /V _B When the lower limit value of the above range is not less than the lower limit value, the hair bundle is less likely to fall off from the hair-planting hole during use. V _A /V _B When the upper limit value of the above range is less than or equal to the upper limit value, the warpage of the head during hair implantation can be suppressed.

Every 1cm in front view in the area A ² The ratio Q of the volume of the hair-planting holes _A Preferably 35mm ³ /cm ² Above 60mm ³ /cm ² Hereinafter, more preferably 35mm ³ /cm ² Above, 53mm ³ /cm ² Hereinafter, more preferably 35mm ³ /cm ² Above, 47mm ³ /cm ² The following. Ratio Q _A When the lower limit of the above range is not less than the lower limit, high density bristle implantation becomes possible, and the actual feeling of massaging the gum can be secured even in a portion having a small area that can be contacted by the tip of a bristle such as a gum of a molar tooth. Ratio Q _A When the upper limit value of the above range is less than or equal to the upper limit value, warpage of the head during hair implantation can be easily suppressed.

In addition, by using V _A (mm ³ ) Dividing the area of the region a (the area of the implanted bristles) to obtain a ratio Q _A 。

Every 1cm in the front view in the region B ² The volume ratio Q of the resin portion of (A) _B Preferably 65mm ³ /cm ² Above, 85mm ³ /cm ² Below, preferably 65mm ³ /cm ² Above, 80mm ³ /cm ² Hereinafter, more preferably 70mm ³ /cm ² Above, 80mm ³ /cm ² The following. Ratio Q _B When the lower limit value of the above range is not less than the lower limit value, warpage of the head during hair implantation can be easily suppressed. Ratio Q _B When the thickness of the implant hole is not more than the upper limit of the above range, the implant hole having a large diameter can be arranged just above the sufficient back thickness, and a toothbrush having a high massaging feeling of the gum can be provided while the strength of the back is ensured.

In addition, by using V _B (mm ³ ) Dividing the area of the region a (the area of the implanted bristles) to obtain a ratio Q _B 。

In the toothbrush of the present invention, a region from a straight line in the short axis direction contacting the front end of the implanted hole closest to the front end to a straight line in the short axis direction contacting the rear end of the implanted hole closest to the rear end in the front view of the head surrounded by the outline of the head is defined as a region b. V is taken as the sum of the volume of implanted pores in a region C with the implanted hair side facing the back side and the depth of 1mm in a region b of the head _C (mm ³ ). V is taken as the volume of the resin portion in a region D extending from the back surface of the region b of the head to the flocked surface to a depth of 1mm _D (mm ³ ). Thereby, for V _C And V _D When defining, V _C /V _D The value of (A) is preferably V _A /V _B 0.60 times or more and 0.85 times or less.

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

In this example, as shown in fig. 4, a front view of the head 10 is surrounded by the outline of the head 10, and a region b is defined by a line p in the short axis direction from a line p in the short axis direction contacting the tip of the 2 nd implanted hole 11b, which is the implanted hole closest to the tip, to a line q in the short axis direction contacting the rear end of the 1 st implanted hole 11a, which is the implanted hole closest to the rear end. V is obtained by summing the volumes of the 1 st implanted hole 11a and the 2 nd implanted hole 11b in a region C (FIG. 6) having a depth of 1mm from the implanted surface 10a in the region b of the head 10 _C (mm ³ ). V is taken as the volume of the resin portion 10c in the region D (FIG. 6) from the back surface 10b of the region b to a depth of 1mm _D (mm ³ )。

Relative to V _A /V _B Value of (A), V _C /V _D The value of (b) is preferably 0.60 times or more and 0.85 times or less, more preferably 0.65 times or more and 0.85 times or less, and still more preferably 0.70 times or more and 0.80 times or less. V _C /V _D Relative to V _A /V _B When the value of (A) is less than 0.60 times, since the edge width is large, V is compared with V _A /V _B Satisfying the degree of suppression that can be exhibited by the range of 0.50 to 1.00, the occurrence of warpage can be further suppressed, but at the same time, the width of the head also becomes large, and therefore, the oral operability is degraded. On the other hand, V _C /V _D Relative to V _A /V _B If the value of (A) is more than 0.85 times, it is difficult to secure a sufficient edge width, and thus the degree of head warpage is larger than that obtained by V _A /V _B Satisfying the range of 0.50 to 1.00 provides the same degree of suppression, and there is no prospect of further suppression.

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

The grip body 1a is preferably made of a resin having a flexural modulus of elasticity (JIS K7171) of 1500MPa or more. The flexural modulus of the resin used as the material of the grip body 1a is more preferably 1500MPa to 3000MPa, and still more preferably 2000MPa to 2700 MPa. When the flexural modulus of elasticity of the resin is equal to or higher than the lower limit value, warpage of the head 10 is easily suppressed. When the flexural modulus of elasticity of the resin is not more than the upper limit value, the neck portion 12 is appropriately flexed during brushing, thereby improving the massaging feeling of the gum. In addition, the compliance of the hair tips with the tooth row can be improved, and efficient tooth brushing can be achieved.

Examples of preferable resins for use as the material of the grip body 1a include: polypropylene (PP), polyoxymethylene (POM), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), and polycyclohexylenedimethylene terephthalate (PCT), POM is particularly preferable from the viewpoint of resin strength.

The resin used as the material of the grip body 1a may be 1 kind, or 2 or more kinds.

In order to improve the grip, the handle body may be partially or entirely covered with a soft resin such as an elastic body, for example. The soft resin is preferably an olefin-based elastomer in the case of PP and a styrene-based elastomer in the case of POM, from the viewpoint of improving adhesiveness.

The overall length of the grip body 1a may be determined as appropriate in consideration of workability and the like, and may be, for example, about 100 to 200 mm.

As shown in fig. 7, in the toothbrush 1, the 1 st tuft 16a and the 2 nd tuft 16b formed by bundling and folding the plurality of brush staples 15 are implanted into the 1 st implantation hole 11a and the 2 nd implantation hole 11b, respectively, by driving the flat wire 20. Thus, the toothbrush of the present invention is a flat wire type bristle-implanted toothbrush.

The material of the brush is not particularly limited, and examples thereof include synthetic resin materials such as polyamide (6-12 nylon, 6-10 nylon, 12-nylon, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polypropylene terephthalate, etc.), polyolefin (polypropylene, etc.), elastomer (olefin-based, styrene-based, etc.), and natural materials. The material of the brush 15 may be 1 kind, or 2 or more kinds.

The cross-sectional shape of the brush is not limited to a circle, but may be a triangle, a quadrangle, a hexagon, a petal, or the like, or may be a combination thereof. The overall shape of the bristles is not particularly limited, and bristles processed into a wavy, twisted, or zigzag shape may be used.

The diameter of the brush bristles is preferably 3 to 12mil (0.076 to 0.305 mm), more preferably 5 to 10mil (0.127 to 0.254 mm). It is preferable to implant bristles having a small bristle diameter in an implant hole having a large diameter. It is possible to provide a toothbrush which is capable of producing a high massaging feeling of the gum, since the bristles are likely to be bent even when the bristles are thick.

When the cross-sectional shape of the bristle is circular, the diameter of the bristle is the diameter thereof, and when the cross-sectional shape of the bristle is other than circular, the diameter of the circumscribed circle of the cross-section of the bristle is the diameter.

The bristles may be general bristles having almost the same diameter within 1 bristle except for a tip rounded portion. The tapered bristles may have the above-described thicknesses in the vicinity of the bristle surface 10a of the head 10, and may have tapered diameters gradually decreasing in the bristle tip direction so as to sharpen the tips. In this case, since the bristles have good penetration into gaps between teeth and can achieve a soft touch, the bristles are suitable for cleaning the neck of teeth and massaging gums. Further, the ordinary bristles and the tapered bristles may be appropriately selected in each implant hole, or the bristles may be mixed in the same tuft, or may be freely combined.

The length (hair length) of the bristles from the bristle mounting surface 10a can be set appropriately, for example, about 6 to 15 mm. The preferred bristle length is in the range of 9mm to 15mm for adults and 6mm to 9mm for children.

The diameters of the 1 st and 2 nd hair bundles 16a and 16b may be set according to the diameters of the implanted 1 st and 2 nd implanted holes 11a and 11b.

As described above, the toothbrush head of the present invention has a thin wall thickness of 2mm to 4mm, and therefore has excellent oral operability and provides a high feeling of reliable cleaning of molar teeth and the like. Furthermore, the ratio of the implanted pores with a diameter of 1.8mm or more is 10% or more, therebyEasily ensure the effects of improving the actual feeling of massaging the gum, and the like. Further, V is _A /V _B The range of 0.50 to 1.00 is controlled. Thus, even if the hair-planting holes formed in the head portion are large in diameter, warping of the head portion and falling-off of hair bundles during hair planting can be suppressed.

The following is a factor that can suppress the warping of the head during hair implantation.

In flat-line tufting, an attempt is made to act on the force that expands the pores of the plant. Therefore, in a side view of the toothbrush, an arcuate warpage gradually descending toward the back side is easily formed from the connecting portion of the head and the neck to the front end of the head. The closer the force trying to enlarge the hole is to the hair-planted surface, the larger the volume of the hair-planted hole is, and the more likely the warp is to be caused by affecting a larger area of the surrounding resin portion. When the head portion is warped, a force for compressing the resin portion is generated in a portion close to the back surface of the head portion. Therefore, the larger the resin volume, the more difficult the warpage is to occur. By mixing V _A /V _B By controlling the volume of the implanted holes near the implanted surface and the volume of the resin portion near the back surface within the above ranges, head warpage during implantation due to the driving of the flat wire can be suppressed.

Further, it is considered that the main reason why the falling-off of the hair bundle can be suppressed is as follows.

In the flat wire type hair transplantation, the larger the diameter of the pore for implantation, the thicker the part of the bundle bent under the flat wire when implanting the bundle, so that it is difficult to deeply drive the flat wire in the direction of the depth of the pore for implantation, and the bundle is likely to be dropped. In order to suppress the falling of the hair bundle, a method of increasing the hole depth of the implanted hole may be considered, but the strength of the head is reduced due to the reduction of the back surface thickness caused by this. As is clear from the above, in order to suppress the falling of the hair bundle, there is an appropriate V _A /V _B The range of (1).

The toothbrush of the present invention is not limited to the toothbrush 1 described above.

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

In the toothbrush of the present invention, the number of tufts implanted in the implanted surface of the head and the arrangement pattern of the implanted holes are not limited to the toothbrush 1. Specifically, the number of tufts and the arrangement pattern of the implanting holes in the toothbrush of the present invention may be in the same manner as in the embodiments of the toothbrushes 1A to 1G illustrated in fig. 8 to 14.

As shown in fig. 15, the toothbrush of the present invention may be a toothbrush 1H in which the small-diameter 2 nd implantation hole 11b is disposed on the outer side in the short axis direction and the large-diameter 1 st implantation hole 11a is disposed on the inner side in the short axis direction.

The present invention will be described in detail below with reference to examples, but the present invention is not limited to the following descriptions.

[ evaluation of easiness of cleaning of molar teeth ]

The sensory test was performed by 10 panelists, and the ease of cleaning of molars (second large molars) was evaluated according to the following criteria. The average score of 10 panelists was "very good" at 4.0 to 5.0, the score of 3.0 to less than 4.0, the score of 2.0 to less than 3.0, the score of "Δ", and the score of less than 2.0, the score of "x". The toothbrush having o or ∈ was judged as a toothbrush having high ease of cleaning molar teeth.

(evaluation criteria)

And 5, dividing: it is very easy to brush.

And 4, dividing: brushing was somewhat easier.

And 3, dividing: generally.

And 2, dividing: it is somewhat difficult to brush.

1 minute: it is very difficult to brush.

[ evaluation of actual feeling of massaging of gum ]

The sensory test was conducted by 10 panelists, and the actual feeling of massaging the gum was evaluated according to the following criteria. The average score of 10 panelists was 4.0 or more and 5.0 or less as "very excellent", the score of 3.0 or more and less than 4.0 as "good", the score of 2.0 or more and less than 3.0 as "delta", and the score of less than 2.0 as "x". The toothbrush o or ∈ is determined to be a toothbrush having a high actual feeling of massaging the gum.

(evaluation criteria)

And 5, dividing: is very perceptible.

And 4, dividing: slightly perceptible.

And 3, dividing: generally.

And 2, dividing: less perceptible.

1 minute: it is not perceived at all.

[ evaluation of warpage of head ]

As shown in fig. 16, in the side view of the toothbrush, the parting line in the connecting region between the head 10 and the neck 12 (the region from the rearmost end of the bristle-implanting hole to the smallest diameter of the neck) is extended to the extension line k on the tip side of the head 10, and the intersection point of the extension line k in the non-warped state before bristle implantation and the tip surface of the head 10 is defined as a point s. As shown in fig. 17, the distance d between the extension k and the point s in the toothbrush after bristle implantation of each example was measured as the head warpage. The warpage of the head was evaluated according to the following criteria.

(evaluation criteria)

Very good: the warpage was 0mm.

O: the warpage is more than 0mm and less than 0.5mm.

And (delta): the warpage is 0.5mm or more and less than 1.0mm.

X: the warp is 1.0mm or more.

[ difficulty of falling of the Hair bundle ]

The bundle implanted in 1 large-diameter implantation hole was grasped with a special instrument, and the maximum tensile stress (N) until the bundle fell off from the implantation hole was measured with a tensile tester (tensile speed 20 mm/min) (N = 10), and the difficulty of bundle falling was evaluated from this value according to the following criteria.

(evaluation criteria)

Very good: the average value of the maximum tensile stress is 25N or more.

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

And (delta): the average value of the maximum tensile stress is 15N or more and less than 20N.

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

[ example 1]

The grip body 1a illustrated in FIGS. 1 to 6 was produced by injection molding using POM (flexural modulus of elasticity: 2500 MPa) as a resin for forming the grip body, in accordance with the specifications shown in tables 1 and 2. Bristles made of polybutylene terephthalate (diameter: 5.0mil in large hole and 6.0mil in small hole) were bundled and folded in half, and a flat wire sandwiched therebetween was driven into a bristle-implanting hole in the head to implant a bristle bundle, thereby producing a toothbrush.

Examples 2 to 5 and comparative examples 1 to 4

Toothbrushes were produced in the same manner as in example 1, except that the specifications shown in tables 1 and 2 were changed.

The specifications and evaluation results of the toothbrushes of the respective examples are shown in tables 1 and 2. In addition, "ratio P" in table 2 is: a ratio of the total number of large-diameter implantation holes having a diameter of 1.8mm or more to the total number of implantation holes provided on the implantation surface.

[ Table 1]

As shown in Table 2, the thickness of the head, the ratios P and V were set _A /V _B The toothbrushes of examples 1 to 5 controlled within the range specified by the present invention were suppressed in warpage of the head. Further, the actual feeling of cleaning the molars and massaging the gums are high, and the hair bundles are hard to fall off.

The toothbrush of comparative example 1, which does not have the large-diameter implanted holes having a diameter of 1.8mm or more, has an insufficient feeling of massaging the gums as compared with the examples. V _A /V _B The toothbrush of comparative example 2, which was too large, could not suppress warpage of the head. V _A /V _B In the toothbrush of comparative example 3, which was too small, the tufts were liable to fall off. In comparative example 4 in which the thickness of the head was too large, the ease of cleaning the molars was insufficient compared with the examples.

Claims (5)

1. A toothbrush comprising a handle body made of resin and having a head part with a plurality of implantation holes formed in an implantation surface, and a bristle implanting part in which tufts are implanted in each of the implantation holes by flat-line bristle implantation,

the thickness of the head part is more than 2mm and less than 4mm,

the proportion of the total number of implanted pores with the diameter of more than 1.8mm to the total number of implanted pores arranged on the implanted surface is 10-80%,

in the area a of the hair-planted section in the front view of the head, the sum of the volumes occupied by the hair-planted holes in the area A with a depth of 1mm from the hair-planted surface to the back surface is set as V _A (mm ³ ) V is the volume occupied by the resin part in the region B with the depth of 1mm from the back surface to the flocked surface _B (mm ³ ) When the temperature of the water is higher than the set temperature,

V _A /V _B is 0.50 to 1.00 inclusive.

2. The toothbrush of claim 1, wherein in a front view of the area A, every 1cm ² The volume proportion of the implanted pores is 35mm ³ /cm ² Above 60mm ³ /cm ² The following.

3. Toothbrush according to claim 1 or 2, wherein in the front view of the area B every 1cm ² Has a volume ratio of the resin portion of 65mm ³ /cm ² Above, 85mm ³ /cm ² The following.

4. The toothbrush according to claim 1 or 2, wherein a sum of volumes occupied by the implantation pores in a region C having a depth of 1mm from the implantation surface in a region b surrounded by a head contour and extending from a straight line in a short axis direction adjacent to a front end of the implantation pores closest to the front end to a straight line in a short axis direction adjacent to a rear end of the implantation pores closest to the rear end in the front view of the head is set as V _C (mm ³ ) V represents the volume occupied by the resin portion in a region D from the back surface to a depth of 1mm _D (mm ³ ) When the temperature of the water is higher than the set temperature,

V _C /V _D has a value of V _A /V _B 0.60 times or more and 0.85 times or less.

5. The toothbrush according to claim 1 or 2, wherein a plurality of 1 st pores having a diameter of 1.8mm or more are formed on both sides of the bristle surface in the short axis direction, and a plurality of 2 nd pores having a diameter of less than 1.8mm are formed inside the 1 st pores in the short axis direction of the bristle surface.

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