TW202002845A - 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 VA (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 VB (mm3), VA/VB is 0.50 to 1.00.

Description

toothbrush

The invention relates to a toothbrush. This application claims priority based on Japanese Patent Application No. 2018-105171 filed on May 31, 2018 in Japan, and the contents thereof are incorporated herein.

As a toothbrush that improves the operability of the toothbrush in the oral cavity and improves the sense of cleaning the narrow parts such as the molars in the oral cavity, a toothbrush having a thin-walled head with a thickness of about 2 mm to 3 mm is known (Patent Document 1). In addition, as a toothbrush that can gently massage the gums, a toothbrush having a large-diameter hair bundle having a diameter of 1.8 mm or more that easily disperses the brushing pressure is known (Patent Document 2). [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2011-4852 [Patent Document 2] Japanese Patent Laid-Open No. 2012-34844

[Problems to be solved by the invention]

However, forming a large number of large-diameter pores on the thin-walled head makes it difficult to coexist with the effects of cleaning the molars and the like and improving the massage of the gums. If many large-diameter hair transplant holes are formed on the thin-walled head, the handle body is likely to warp from the boundary portion of the head and neck during hair transplantation, especially in the area of the head. Therefore, the use of toothbrushes Sexual decline. In addition, the force of holding the hair bundle in the large-diameter hair-planting hole is reduced, and therefore, the hair bundle is likely to come off during use.

An object of the present invention is to provide a toothbrush including a thin-walled head, which has a high sense of cleaning of molars and the like, and even if most of the pores formed in the head are large in diameter, warping of the head and hair bundles during hair implantation The shedding is also suppressed. [Means to solve the problem]

The present invention has the following structure. [1] A toothbrush including a resin-made handle body including a head provided with a plurality of hair-planting holes on the hair-planting surface, and the toothbrush is provided with a flat thread The hair-planting portion provided with hair bundles in each of the hair-planting holes, the thickness of the head is 2 mm or more and 4 mm or less, relative to the total number of hair-planting holes provided on the hair-planting surface , The proportion of the total number of pores with a diameter of 1.8 mm or more is 10% or more, and when the pores are placed in front of the head, the area a of the hair-planting part is oriented from the hair-planting surface The total volume occupied by the area A from the back surface to a depth of 1 mm is set to V _A (mm ³ ), and the resin portion is occupied by the area B from the back surface to the tufted surface to a depth of 1 mm When the volume of is set to V _B (mm ³ ), V _A /V _B is 0.50 or more and 1.00 or less. [2] The toothbrush according to [1], wherein the ratio of the volume of the pores 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 . [3] The toothbrush according to [1] or [2], wherein the ratio of the volume of the resin portion per 1 cm ² in front view in the area B 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] to [3], wherein the volume occupied by the pores in the area C in the area b from the hair-planting surface to a depth of 1 mm When the sum is set to V _C (mm ³ ) and the volume occupied by the resin portion in the area D from the back to a depth of 1 mm is set to V _D (mm ³ ), the value of V _C /V _D is V _A / The value of V _B is 0.60 times or more and 0.85 times or less, wherein the area b is surrounded by the outline of the head and is tangent to the front end of the hair-planting hole closest to the front end when the head is viewed from the front The area from the straight line in the short-axis direction to the straight line in the short-axis direction that is tangent to the rear end of the hair graft hole closest to the rear end. [5] The toothbrush according to any one of [1] to [4], wherein a plurality of 1.8 mm or more in diameter arranged in the long axis direction are formed on both sides of the hair planting surface in the short axis direction, respectively A 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. [Effect of invention]

The toothbrush of the present invention includes a thin-walled head, which has a high sense of cleaning of molars and the like, and even if the majority of the pores formed in the head are of a large diameter, warping of the head and shedding of hair bundles during hair transplantation are suppressed.

Hereinafter, an example of the toothbrush of the present invention will be described in detail. In addition, the dimensions etc. of the figures illustrated in the following description are examples, and the present invention is not necessarily limited to these, and can be implemented with appropriate changes within the scope without changing the gist thereof.

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

The neck 12 extends in contact with the rear end side of the head 10 in the long axis direction. The neck 12 is a portion that connects the handle 14 and the head 10. The handle 14 extends in contact with the rear end side of the neck 12 in the long axis direction. The handle 14 is a portion held by the user. The handle body 1a may be formed by integrally forming the head portion 10, the neck portion 12, and the handle portion 14, or may be formed by individually joining any of these.

In the present invention, if the distance between the front end of the outer edge of the hair graft hole disposed on the most front end side and the front end of the head in the long axis direction is L1 (FIG. 2 ), the rear end of the head is from the rear end side The rear end of the outer edge of the hair graft hole is located at a distance L1 from the rear end side in the long axis direction. The head 10 has a hair-planting 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-planting portion 18 is provided on the head 10 of the toothbrush 1. In the hair-planting portion 18, a first hair bundle 16a is implanted in each of the plurality of first hair-planting holes 11a, and a second hair bundle 16b is implanted in each of the plurality of second hair-planting holes 11b.

The thickness of the head 10 is 2 mm or more and 4 mm or less, preferably 2.5 mm or more and 3.5 mm or less. If the thickness of the head 10 is equal to or less than the upper limit of the above range, the toothbrush 1 has excellent oral operability and a high sense of cleaning of narrow parts in the oral cavity such as molars. If the thickness of the head 10 is equal to or greater than the lower limit of the above-mentioned range, even if many of the hair-planting holes formed on the head have a large diameter of 1.8 mm or more, it is possible to suppress warping of the head and hair bundles during hair implantation Fall off. Furthermore, the range of the thickness of the head means that no matter where the head is measured, the thickness is within the range.

The width of the head 10 is preferably 6 mm to 16 mm, more preferably 8 mm to 15 mm, and particularly preferably 10 mm to 12 mm. If the width of the head 10 is equal to or greater than the lower limit of the above-mentioned range, it is easy to provide a plurality of large-diameter hair transplant holes with a diameter of 1.8 mm or more in the short-axis direction of the head, thereby providing hair that effectively utilizes the large diameter A toothbrush with a high sense of massaging on the gums. In addition, even if a plurality of large-diameter hair-planting holes are arranged in the short-axis direction, it is easy to sufficiently ensure the pitch of the hair-planting holes, and therefore it is easy to suppress warping of the head. If the width of the head 10 is equal to or less than the upper limit value of the above range, the advantage of a thin-walled head, that is, operability in the oral cavity 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 indicated by "~" means a numerical range including the numerical values before and after ~ as the lower limit value and the upper limit value.

The length of the head 10 is preferably 10 mm to 33 mm, and more preferably 12 mm to 28 mm. If the length of the head 10 is equal to or greater than the lower limit of the above range, a large number of large-diameter hair implant holes can be provided in the long axis direction of the head, and a toothbrush with a high sense of massaging of the gums can be provided. In addition, even if a plurality of large-diameter hair-planting holes are arranged in the long-axis direction, it is easy to sufficiently ensure the pitch of the hair-planting holes, and therefore it is easy to suppress warping of the head. If the length of the head 10 is equal to or less than the upper limit value of the above range, the advantage of a thin-walled head, that is, 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, and more preferably 0.4 mm to 0.5 mm. If the thickness of the back surface of the head 10 is equal to or greater than the lower limit of the above range, it is easy to suppress the warpage of the head 10. If the thickness of the back surface of the head 10 is equal to or less than the upper limit of the above range, the thickness of the head becomes thinner accordingly, so that the advantage of the thin-walled head, that is, the operability in the oral cavity is not impaired. In addition, the thickness of the back of the head refers to the distance from the back of the head to the bottom of the pores. The back surface of the head is the surface of the head opposite to the hair-planting surface. The thickness of the back surface of the head means that no matter where the head is measured, the thickness of the back surface is within the range.

In the present invention, the plurality of hair-planting holes formed on the hair-planting surface of the head may be a hair-planting hole with a single diameter or a combination of hair-planting holes with different diameters. In the case of combining planting holes with different diameters, it is preferable to make the diameters of the planting holes arranged in the long axis direction uniform. If the diameters of the pores arranged in the long axis direction are the same, the hair bundles of the same thickness are arranged in the long axis direction, therefore, the degree of curvature of each hair bundle becomes uniform during brushing, which is easy to enhance the sense of massage of the gums . In addition, from the viewpoint of easy massaging of the gums, it is preferable to arrange the hair implantation holes having a larger diameter that can easily disperse the brushing pressure on the outer side in the short axis direction. In addition, in order to further improve the cleaning feeling of the molars by effectively using the thin-walled head, and coexist with the massage feeling, it is preferable to arrange the hair bundle with a small diameter that bears the cleaning effect in the short axis direction Inside. In addition, the short axis direction is a direction parallel to the tufted surface and orthogonal to the long axis direction. The arrangement pattern of the planted pores is not particularly limited, and may be staggered or latticed.

In this example, as shown in FIG. 2, each of the two sides in the short-axis direction of the hair-planting surface 10 a of the head 10 is formed with five first plants with a diameter of 1.8 mm or more aligned in the long-axis direction. Pores 11a. A total of 17 second hair-planting holes 11b having a diameter of less than 1.8 mm, which are arranged in three rows in the long-axis direction, are formed in the center portion of the first hair-planting hole 11a in the short-axis direction of the hair-planting surface 10a. The second hair transplant holes 11b are formed in a staggered shape.

The diameter of the large-diameter first planting hole 11a having a diameter of 1.8 mm or more is preferably 1.8 mm to 3.2 mm, and more preferably 2.0 mm to 2.5 mm. If the diameter of the first hair-planting hole 11a is equal to or greater than the lower limit of the above range, the sense of massaging the gums is improved. If the diameter of the first hair-planting hole 11a is less than the upper limit of the range, when the hair bundle is planted, the folded portion of the hair bundle under the flat line will not become excessively thick, and can be flattened in the depth direction of the hair-planting hole The thread penetrates deeply, so it is possible to suppress the shedding of the hair bundle. The diameters of the large-diameter pores arranged in the long axis direction are preferably the same.

The diameter of the second planting hole 11b having a small diameter of less than 1.8 mm is preferably 1.0 mm to 1.7 mm, and more preferably 1.2 mm to 1.5 mm. If the diameter of the second hair-planting hole 11b is equal to or greater than the lower limit of the above range, the rigidity of the hair bundle required for tartar cleaning can be ensured. If the diameter of the second hair-planting hole 11b is equal to or less than the upper limit value of the above range, it is possible to ensure moderate hair bundle bending required for tartar cleaning. The diameters of the small-diameter pores arranged in the long axis direction are preferably the same. In addition, when the shape of the pores in the front view is circular, the diameter of the pores is its diameter. In the case of the shape of the pores in the front view is a shape other than circular, the diameter of the pores is in the front view. The diameter of the circumscribed circle of the implanted pore.

In the present invention, the ratio of the total number of large-diameter pores with a diameter of 1.8 mm or more (hereinafter, also referred to as "ratio P") relative to the total number of pores provided on the flocking surface is 10% the above. In the toothbrush 1 of this embodiment, the ratio P is 34%. By setting the ratio P to 10% or more, the massage feeling for the gums is improved. The upper limit of the ratio P is 100%. The lower limit of the ratio P is 10% or more, preferably 20% or more, and more preferably 30% or more. The upper limit of the ratio P is 100%, preferably 80% or less, more preferably 50% or less, and particularly preferably 40% or less. The ratio P is preferably 10% to 80%, more preferably 20% to 50%, and particularly preferably 30% to 40%. In this way, the sensation of gingival massage and tartar cleaning can coexist.

In the present invention, the ratio of the total number of planted pores with a diameter of 2.0 mm or more is preferably 10% or more, and the ratio of the total count of planted pores with a diameter of 2.0 mm or more relative to the total number of planted pores provided on the planting surface More preferably, it is 20% or more, and the ratio of the total number of pores with a diameter of 2.0 mm or more is particularly preferably 30% or more. In this way, it is easy to obtain a sense of massaging the gums.

In the present invention, it is preferable to arrange a large-diameter hair implant hole with a diameter of 1.8 mm or more along the side edge of the head on the long axis direction outside the short-axis direction of the hair implant surface of the head, and to use these large The planted pores of a diameter are arranged so as to sandwich the planted pores of a small diameter in the central part. In the toothbrush 1, two rows of first hair-planting holes 11a formed along the side edges of the head 10 in the long axis direction sandwich the second hair-planting holes 11b in the central portion. In this way, the sense of massaging the gums during brushing can be further improved. Furthermore, in the present invention, one row of large-diameter hair grafting holes may be used to sandwich the central portion of the hair-planting holes, or two rows of large-diameter hair grafting holes may be used to sandwich the center of the hair-planting holes.

Since the hair-planting holes formed on the outer side in the short-axis direction are close to the edge of the head, the effect of the hair-planting holes on the deformation imparted to the head is within the 180-degree range of the inside (center side) in front view. On the other hand, the pores formed in the central part of the short axis direction of the head are deformed 360 degrees in all directions when viewed from the front. According to these, the hair-planting holes formed in the central portion of the head in the short-axis direction have a greater influence on the warpage of the head than the hair-planting holes formed in the outer side in the short-axis direction. Therefore, from the viewpoint of reducing the deformation given to the surrounding planting pores as much as possible and easily suppressing warping of the head, it is preferable to set the depth of the planting pores formed in the central section of the head in the short axis direction The depth of the pores formed outside the short axis direction is shallow. In addition, the large-diameter hair grafting holes become thicker when the hair bundle is folded under the flat line. Therefore, in order to suppress the fall-off of the hair bundle, the depth of the planting pores needs to be set deeper. Compared with large-diameter pores, the depth of the pores can be set shallower. Therefore, it is more preferable to form a small-diameter hair implantation hole with a shallow hole depth at the central portion of the head in the short-axis direction, and to form a large-diameter hair implantation hole with a small hole depth to the outside in the short-axis direction. In this way, even in the thin head, the suppression of the warpage of the head and the suppression of the shedding of the hair bundle can coexist, and a massage massage for the gums can also be obtained.

In the case of setting a difference in the depth of the implanted pores, the difference in the pore depth is preferably within 0.3 mm, and more preferably within 0.2 mm. By making the difference in hole depth within the above range, it is also easy for the thin head to suppress the warpage of the head and the suppression of the shedding of the hair bundle.

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

In the toothbrush of the present invention, the total volume occupied in the area A in the area a of the hair-planting portion when the pores are planted in the front view of the head from the hair-planting surface toward the back to a depth of 1 mm is V _A (mm ³ ). The volume occupied by the resin portion in the area a of the hair-planting portion in the front view of the head from the back to the hair-planting surface to a depth of 1 mm is V _B (mm ³ ). When V _A and V _B are defined in this way, V _A /V _B is 0.50 or more and 1.00 or less. In addition, the "region a of the hair-planting part in front view of the head" is an area surrounding each hair-planting hole located at the outermost circumference when the head is in front view. The surrounding line forming the area a is formed by connecting the common tangent lines of adjacent pores. In the case where the back surface is tapered so that the thickness of the head becomes thicker toward the rear end, the area B is set to a region with a depth of 1 mm along the tapered back surface.

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

V _A /V _B is 0.50 or more and 1.00 or less, preferably 0.52 or more and 0.93 or less, and more preferably 0.52 or more and 0.80 or less. If V _A /V _B is more than the lower limit of the above-mentioned range, it is difficult for the hair bundle to fall off from the pores during use. If V _A /V _B is equal to or lower than the upper limit of the above range, warping of the head during hair implantation is suppressed.

The ratio Q _A of the volume of pores per 1 cm ² in frontal view in the area A is preferably 35 mm ³ /cm ² or more and 60 mm ³ /cm ² or less, more preferably 35 mm ³ /cm ² or more and 53 mm ³ /cm ² or less, particularly preferably 35 mm ³ /cm ² or more and 47 mm ³ /cm ² or less. If the ratio Q _A is equal to or greater than the lower limit of the above range, high-density hair transplantation can be realized, and even if the contact area of the hair tips such as the gums of the molars is small, a firm feeling of massage of the gums can be secured. If the ratio Q _A is equal to or less than the upper limit of the above range, it is easy to suppress warping of the head during hair transplantation. In addition, the ratio Q _A is obtained by dividing V _A (mm ³ ) by the area of the area a (hair-planting area).

The ratio Q _B of the volume per 1 cm ² of the resin portion in the front view in the area B is preferably 65 mm ³ /cm ² or more and 85 mm ³ /cm ² or less, preferably 65 mm ³ /cm ² or more and 80 mm ³ /cm ² or less, particularly preferably 70 mm ³ /cm ² or more and 80 mm ³ /cm ² or less. If the ratio Q _B is equal to or greater than the lower limit of the above range, it is easy to suppress warping of the head during hair transplantation. If the ratio Q _B is equal to or less than the upper limit of the above range, a large-diameter hair grafting hole can be arranged directly above the sufficient back thickness, and a toothbrush with a high sense of massaging of the gums can be provided while ensuring the strength of the back. In addition, the ratio Q _B is obtained by dividing V _B (mm ³ ) by the area of the area a (the hair-planting area).

In the toothbrush of the present invention, it is surrounded by the outline of the head and extends from a straight line in the short-axis direction that is tangential to the front end of the planting hole closest to the front end when viewed from the front of the head to the rear end of the planting hole closest to the rear end The area up to the straight line in the short-axis direction of the cut is referred to as area b. The total volume occupied in the region C in the region b where the hair-planting hole is in the head from the hair-planting surface toward the back to a depth of 1 mm is V _C (mm ³ ). The volume occupied by the resin portion in the area D of the head from the back surface toward the tufting surface to a depth of 1 mm is V _D (mm ³ ). When V _C and V _D are defined in this way, the value of V _C /V _D is preferably 0.60 times or more and 0.85 times or less 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 set to a region with a depth of 1 mm along the tapered back surface.

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

The value of V _C /V _D relative to the value of V _A /V _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 particularly preferably 0.70 times or more and 0.80 times or less. If the value of V _C /V _D is less than 0.60 times the value of V _A /V _B , the width of the edge is large. Therefore, although the occurrence of warpage is more than 0.50 to 1.00 by V _A /V _B The degree of suppression exerted by the range is further suppressed, but at the same time, the width of the head also becomes larger, so the operability in the oral cavity decreases. 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. Therefore, the degree of head warpage is different from that caused by V _A /V _B The degree of suppression that satisfies the range of 0.50 or more and 1.00 or less becomes the same degree, and further suppression cannot be expected. V _C /V _{D is} preferably 0.35 or more and 0.75 or less, and more preferably 0.37 or more and 0.68 or less.

As the material of the handle body 1a, a resin having a bending modulus of elasticity (Japanese Industrial Standards (JIS) K7171) of 1500 MPa or more is preferable. The bending elastic modulus of the resin used as the material of the handle body 1a is more preferably 1500 MPa or more and 3000 MPa or less, and particularly preferably 2000 MPa or more and 2700 MPa or less. If the bending elastic coefficient of the resin is equal to or higher than the lower limit value, the warpage of the head 10 is easily suppressed. If the flexural elastic coefficient of the resin is equal to or lower than the upper limit value, the neck 12 at the time of brushing is moderately curved, thereby improving the sense of massaging the gums. In addition, the followability of the hair tips to the dentition can be improved, so that the teeth can be brushed efficiently.

Examples of preferable resins used as the material of the handle body 1a include polypropylene (Polypropylene (PP), polyoxymethylene (POM), polybutylene terephthalate (PBT), and polyparaphenylene Polyethylene terephthalate (PET) and polycyclohexylene dimethylene terephthalate (PCT) 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 the grip, the handle body may be partially or entirely coated with a soft resin such as an elastomer. As the soft resin, in terms of improving the adhesion, if it is PP, it is preferably an olefin-based elastomer, and if it is POM, it is preferably a styrene-based elastomer.

The full 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, the first hair-planting hole 11 a and the second hair-planting hole 11 b are respectively planted by bundling and folding a plurality of toothbrush hairs 15 by punching in a flat wire 20. A hair bundle 16a and a second hair bundle 16b. As such, the toothbrush of the present invention is a flat-line hair-planting toothbrush.

The material of the toothbrush bristles is not particularly limited, and examples include polyamide (6-12 nylon, 6-10 nylon, 12-nylon, etc.), polyester (polyethylene terephthalate, poly terephthalate Synthetic resin materials such as butylene formate, polytrimethylene terephthalate, etc.), polyolefins (polypropylene, etc.), elastomers (olefin-based, styrene-based, etc.) or natural materials. The material of the toothbrush bristles 15 may be one kind, or two or more kinds.

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

The diameter of the toothbrush bristles is preferably 3 mils to 12 mils (0.076 mm to 0.305 mm), and more preferably 5 mils to 10 mils (0.127 mm to 0.254 mm). Preferably, toothbrush hairs having a small toothbrush hair diameter are planted in the large-diameter hair-planting holes. Even if it is a thick hair bundle, it can bend the hair bundle when brushing, and can provide a toothbrush with a high sense of massaging to the gums. Furthermore, when the cross-sectional shape of the toothbrush is circular, the diameter of the toothbrush is its diameter, and when the cross-sectional shape of the toothbrush is other than circular, the diameter of the toothbrush is the diameter of the toothbrush. The diameter of the circumscribed circle of the cross section.

The toothbrush bristles may be normal bristles having substantially the same diameter in one toothbrush bristle except for the rounded portion of the bristle tip. In addition, it may be a tapered hair having such a thickness in the vicinity of the hair-planting surface 10a of the head 10 and having a diameter gradually tapered toward the hair tip. In this case, the hair tip has good intrusion into the tooth gap and can achieve soft touch comfort. Therefore, it is suitable for cleaning the tooth neck or massaging the gums. In addition, the normal hair and tapered hair can be appropriately selected for individual pores, or the common hair and tapered hair can be mixed in the same hair bundle, and they can be combined freely.

The length (hair length) from the tufted surface 10a of the toothbrush bristles can be appropriately set, for example, about 6 mm to 15 mm. The hair length of the toothbrush hair is preferably in the range of 9 mm to 15 mm for adults, and preferably in the range of 6 mm to 9 mm for children. The diameters of the first hair bundle 16a and the second hair bundle 16b may be set according to the diameters of the first hair implant hole 11a and the second hair implant hole 11b to be implanted.

As described above, in the toothbrush of the present invention, since the thickness of the head is 2 mm or more and 4 mm or less, it has excellent operability in the oral cavity and a high sense of cleaning of molars and the like. In addition, by setting the ratio of the pores with a diameter of 1.8 mm or more to 10% or more, it is easy to ensure the effect of improving the massage feeling on the gums. Furthermore, V _A /V _{B is} controlled in the range of 0.50 or more and 1.00 or less. This makes it possible to suppress the warpage of the head or the shedding of hair bundles during hair transplantation, even if many of the hair transplant holes formed on the head are large in diameter.

The reason why the warpage of the head is suppressed during hair transplantation is considered as follows. In flat-line hair transplantation, the force to enlarge the pores is applied to the pores. Therefore, when the toothbrush is viewed from the side, it is easy to form an arch-shaped warp that gradually decreases from the connecting portion of the head and the neck to the front end of the head on the back side. The closer the force to expand the hole is to the tufting surface, the larger the volume of the tufting hole, the more it affects the wider area of the surrounding resin portion, so warpage is likely to occur. In addition, when the head is warped, a force that compresses the resin portion is generated in a portion of the head near the back. Therefore, the larger the volume of the resin, the less likely to be warpage. Control V _A /V _B within the range, and adjust the volume of the planting pores close to the planting surface and the volume of the resin part near the back to an appropriate range. Head warpage is suppressed.

Furthermore, the reason why the shedding of hair bundles is suppressed is considered as follows. In flat-line hair transplantation, the larger the pore diameter of the pores, the thicker the folded portion of the hair bundle under the flat line becomes when the hair bundle is planted. Drive in, so that the hair bundle is easy to fall off. In order to suppress the shedding of hair bundles, a method of deepening the pore depth of the hair-planting holes may be considered, but the reduction in the thickness of the back surface caused by this causes the strength of the head to decrease. According to the above, in order to suppress the shedding of hair bundles, there is an appropriate range of V _A /V _B.

Furthermore, 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 becomes thicker toward the rear end. In the toothbrush of the present invention, the number of hair bundles planted on the hair-planting surface of the head, or the arrangement pattern of the planting holes is not limited to the number of hair bundles of the toothbrush 1 or the arrangement pattern of the planting holes. Specifically, the number of hair bundles or the arrangement pattern of pores of the toothbrush of the present invention may be in the form of the toothbrushes 1A to 1G illustrated in FIGS. 8 to 14. As shown in FIG. 15, the toothbrush of the present invention may be a toothbrush 1H in which the small-diameter second hair-planting holes 11 b are arranged outside in the short-axis direction and the large-diameter first hair-planting holes 11 a are arranged in the short-axis direction.

Hereinafter, the present invention will be described in detail by examples, but the present invention is not limited by the following description. [Evaluation of ease of cleaning molars] A sensory test was conducted by 10 expert reviewers, and the ease of cleaning molars (the second largest molar) was evaluated according to the following criteria. The average score of 10 expert reviewers was 4.0 or more and 5.0 or less as "◎", 3.0 or more and less than 4.0 as "○", and 2.0 or more and less than 3.0 as "△" , Set less than 2.0 points as "×". A toothbrush with high ease of cleaning molars was judged as ○ or ◎. (Evaluation criteria) 5 points: Very easy to brush. 4 points: Slightly easier to brush. 3 points: None of them. 2 points: Slightly difficult to brush. 1 point: Very difficult to brush.

[Evaluation of gingival massage feeling] The sensory test was carried out by 10 expert reviewers, and the actual feeling of massaging the gums was evaluated according to the following criteria. The average score of 10 expert reviewers was 4.0 or more and 5.0 or less as "◎", 3.0 or more and less than 4.0 as "○", and 2.0 or more and less than 3.0 as "△" , Set less than 2.0 points as "×". A toothbrush that is judged to be ○ or ◎ as having a high sense of massaging of the gums. (Evaluation criteria) 5 points: Very felt. 4 points: Feel a little. 3 points: None of them. 2 points: Nothing felt. 1 point: Not felt at all.

[Evaluation of warpage of head] As shown in FIG. 16, when the toothbrush is viewed from the side, the parting line of the connection area (the area from the last end of the pores to the minimum diameter of the neck) of the head 10 and the neck 12 will be made The intersection point of the extension line k extended toward the front end side of the head 10 and the extension line k in the non-warped state before hair implantation and the front end surface of the head 10 is defined as a point s. As shown in FIG. 17, in the toothbrush after hair transplantation of each example, the distance d between the extension line k and the point s was measured, and set as the warpage of the head. The warpage of the head was evaluated according to the following criteria. (Evaluation criteria) ◎: Warpage is 0 mm. ○: Warpage is greater than 0 mm and less than 0.5 mm. △: Warpage is 0.5 mm or more and less than 1.0 mm. ×: Warpage is 1.0 mm or more.

[Not easy to fall off the hair bundle] Use special equipment to grasp the hair bundles planted in a large-diameter pore, use a tensile tester to measure (tensile speed 20 mm/min) (n=10) until the hair bundle falls off from the pores Based on this value, the maximum tensile stress (N) was evaluated according to the following criteria for the ease of shedding of hair bundles. (Evaluation criteria) ◎: The average value of the maximum tensile stress is 25 N or more. ○: The average value of the maximum tensile stress is 20 N or more and less than 25 N. △: The average value of the maximum tensile stress is 15 N or more and less than 20 N. ×: The average value of the maximum tensile stress is less than 15 N.

[Example 1] Using POM (flexural modulus of elasticity: 2500 MPa) as the resin for forming the handle body, the handle body 1a illustrated in FIGS. 1 to 6 was produced by injection molding according to the specifications shown in Table 1 and Table 2. Fold the bristle bundle made of polybutylene terephthalate toothbrush bristles (diameter: large hole 5.0 mil, small hole 6.0 mil), and fold the flat wire sandwiched between them into the head Tow brushes are planted in the pores for making toothbrushes.

[Example 2 to Example 5, Comparative Example 1 to Comparative Example 4] A toothbrush was produced in the same manner as in Example 1 except that the specifications shown in Table 1 and Table 2 were changed.

The specifications and evaluation results of the toothbrushes of each example are shown in Table 1 and Table 2. In addition, the "ratio P" in Table 2 is the ratio of the total number of large diameter planting pores with a diameter of 1.8 mm or more with respect to the total number of planting pores provided on the planting surface.

[Table 1]

[Table 2]

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 are} controlled within the range specified by the present invention, the warpage of the head is suppressed. In addition, the cleaning of the molars and the massage of the gums are high, and the hair bundles are not easy to fall off. In the toothbrush of Comparative Example 1 where no large-diameter pores with a diameter of 1.8 mm or more were present, compared to the example, the massage of the gums was insufficient. In the toothbrush of Comparative Example 2 where V _A /V _{B was} too large, the warpage of the head could not be suppressed. In the toothbrush of Comparative Example 3 where V _A /V _{B is} too small, the hair bundles are likely to come off. In Comparative Example 4 where the thickness of the head is too thick, the ease of cleaning the molars is insufficient compared to the Examples.

1‧‧‧toothbrush 1a‧‧‧handle 1A～1H‧‧‧Toothbrush 10‧‧‧Head 10a‧‧‧Flocked surface 10b‧‧‧Back 10c‧‧‧Resin part 11a‧‧‧First pores 11b‧‧‧Second pores 12‧‧‧ Neck 14‧‧‧handle 15‧‧‧brush hair 16a‧‧‧First hair bundle 16b‧‧‧Second hair bundle 18‧‧‧planting department 20‧‧‧flat a, b, A, B, C, D d, L1‧‧‧Distance k‧‧‧Extended cable p, q‧‧‧ straight 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, the hair bundles and flat lines are omitted. FIG. 3 is a front view showing the area a of the head. Furthermore, the hair bundles and flat lines are omitted. FIG. 4 is a front view showing the area b of the head. Furthermore, the hair bundles and flat lines are omitted. 5 is an I-I cross-sectional view of the toothbrush of FIG. 2. Furthermore, the hair bundles and flat lines are omitted. 6 is a cross-sectional view of the toothbrush of FIG. 2 taken along line II-II. Furthermore, the hair bundles and flat lines are omitted. 7 is a cross-sectional view showing a state in which hair bundles are implanted in the hair implant holes formed on the hair implant surface. 8 is a front view showing another example of the toothbrush of the present invention. 9 is a front view showing another example of the toothbrush of the present invention. 10 is a front view showing another example of the toothbrush of the present invention. 11 is a front view showing another example of the toothbrush of the present invention. 12 is a front view showing another example of the toothbrush of the present invention. 13 is a front view showing another example of the toothbrush of the present invention. 14 is a front view showing another example of the toothbrush of the present invention. 15 is a front view showing another example of the toothbrush of the present invention. FIG. 16 is a side view of the toothbrush before hair implantation, which explains the evaluation method of the warpage of the toothbrush in the example. FIG. 17 is a side view of the toothbrush after hair implantation, which explains the evaluation method of the warpage of the toothbrush in the example. Furthermore, the hair bundles and flat lines are omitted.

1‧‧‧toothbrush

1a‧‧‧handle

10‧‧‧Head

10a‧‧‧Flocked surface

10b‧‧‧Back

10c‧‧‧Resin part

11a‧‧‧First pores

12‧‧‧ Neck

14‧‧‧handle

A, B‧‧‧ area

Claims (5)

A toothbrush includes a resin-made handle body, the resin-made handle body includes a head provided with a plurality of hair-planting holes on the hair-planting surface, and the toothbrush is provided with Each of the hair-planting holes is provided with a hair-planting portion provided with hair bundles, and the thickness of the head is 2 mm or more and 4 mm or less, and the diameter is relative to the total number of hair-planting holes provided on the hair-planting surface The ratio of the total number of pores of 1.8 mm or more is 10% or more, and when the pores are placed in front view of the head, the area a of the hair-planting part is from the planting surface toward the back to the depth The sum of the volume occupied in the area A up to 1 mm is set to V _A (mm ³ ), and the volume occupied by the resin portion in the area B up to a depth of 1 mm from the back surface toward the tufting surface is set to When V _B (mm ³ ), V _A /V _B is 0.50 or more and 1.00 or less. The toothbrush according to item 1 of the patent application scope, wherein the ratio of the volume of the pores 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 item 1 or 2 of the patent application scope, wherein the ratio of the volume of the resin portion per 1 cm ² in the frontal view in the area B is 65 mm ³ /cm ² or more and 85 mm ³ /cm ² or less. The toothbrush according to any one of claims 1 to 3, wherein the volume occupied by the pores in the area C in the area b from the hair-planting surface to a depth of 1 mm When the sum is set to V _C (mm ³ ) and the volume occupied by the resin portion in the area D from the back surface to a depth of 1 mm is set to V _D (mm ³ ), the value of V _C /V _D is V The value of _A /V _B is 0.60 times or more and 0.85 times or less, wherein the area b is surrounded by the outline of the head and is closest to the front end of the pores when viewed from the front of the head The area from the straight line in the short-axis direction that is tangent to the front end to the straight line in the short-axis direction that is tangent to the rear end of the hair graft hole closest to the rear end. The toothbrush according to any one of items 1 to 4 of the patent application scope, wherein A plurality of first hair planting holes with a diameter of 1.8 mm or more arranged in the long axis direction are formed on both sides of the short axis direction of the hair planting surface, and the first planting holes in the short axis direction of the hair planting surface are formed On the inner side of the pores, a plurality of second pores with a diameter of less than 1.8 mm arranged in the direction of the long axis are formed.

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