KR102235228B1 - Toothbrush - Google Patents

Abstract

In the present invention, in the toothbrush (1) in which two or more hair bundles are installed by tying two or more bristles to the hair transplantation surface (20) of the head portion (2), the first hair bundle (32) having the bristles branched at the tip end The second hair bundle group 40 in which the first hair bundle group 30 is planted, and the second hair bundle 42 which surrounds the first hair bundle group 30 and has bristles that are not branched at the tip end. ) It relates to a toothbrush provided. The second hair bundle 42 is preferably provided with a bristles that are reduced in diameter toward the tip, and the second hair bundle 42 is preferably longer than the first hair bundle 32. According to the present invention, it is possible to provide a toothbrush capable of cleaning the oral cavity satisfactorily while applying a sufficient amount of the oral preparation to the interdental or cervical region.

Description

Toothbrush {TOOTHBRUSH}

The present invention relates to a toothbrush.

This application claims priority based on Japanese Patent Application 2013-075892 for which it applied to Japan on April 1, 2013, and uses the content here.

In order to increase the cleaning effect of the toothbrush, which is an oral cleaning device, research has been conducted on the arrangement of the hair bundles tied to the bristles.

In recent years, with the rise of hygiene oriented, toothbrushes are required to further improve the cleaning effect.

In response to such a request, a toothbrush in which hair bundles of different diameters are combined, and a toothbrush in which hair bundles of different hair lengths are combined are proposed.

For the prevention or improvement of tooth decay and periodontal disease, it is effective to clean the interdental or cervical area with an oral preparation containing an active ingredient such as a disinfectant or an abrasive to remove tartar, thereby killing the causative pathogenic bacteria. For this reason, the toothbrush is required to have the ability to hold the oral preparation in the brush portion formed by planting hair bundles while cleaning the oral cavity, and to apply a sufficient amount of the oral preparation to the interdental portion or the cervical portion.

Conventionally, toothbrushes have been proposed for the purpose of enhancing the retention ability of oral formulations.

For example, the side contour shape along the long axis direction of the toothbrush handle for the hair bundle installed in the head is A, the side contour shape along the minor axis direction B, the surface parallel to the long axis at the central position of the maximum width in the minor axis direction of the hair bundle The cross-sectional contour shape cut at C is the cross-sectional contour shape cut from the plane parallel to the minor axis at the central position of the maximum width in the long axis direction of the hair bundle group, and D is the upper part of each contour shape A, B, C, and D. Toothbrush whose ratio U/L is greater than 1.0 and less than 3.0 for at least one of the contour shapes A, B, C, and D when the contour length is U and the bottom contour length is L. This has been proposed (Patent Document 1). According to the invention of patent document 1, by making the end surface of a brush part into a specific shape, the improvement of the holding|maintenance ability of an active component and the foaming power of a skirt material are aimed at.

Japanese Patent Application Publication No. 2003-250632

However, in the invention of Patent Document 1, it cannot be said that the retaining ability of the oral preparation is still sufficient, and a sufficient amount of the oral preparation cannot be applied to the interdental portion or the cervical portion.

Accordingly, an object of the present invention is to provide a toothbrush capable of cleaning the oral cavity satisfactorily while applying a sufficient amount of the oral preparation to the interdental portion or the cervical portion.

In the toothbrush of one aspect of the present invention, in a toothbrush in which a plurality of hair bundles are installed by tying a plurality of bristles to the hair surface of the head portion, the first hair bundle group formed by planting the first hair bundle having the bristles branched at the tip end, and the above It is characterized in that it comprises a second hair bundle group in which a second bundle of hairs, which surrounds the first bundle of hairs and consists of bristles with no branched tip, was installed.

It is preferable that the second hair bundle is made of bristles that shrink toward the tip, and the second hair bundle is more preferably longer than the first hair bundle.

In addition, the present invention has the following aspects.

(1) In a toothbrush in which two or more hair bundles are installed by tying two or more bristles to the hair transplant surface of the head, the first hair bundle group having the first hair bundle having branched bristles at the tip portion is installed, and the first hair bundle group A toothbrush having a second hair bundle in which a second hair bundle having a brush head not branched from the tip portion is installed,

(2) The toothbrush according to (1), wherein the second hair bundle is provided with a bristle that is reduced toward a tip end, and

(3) The toothbrush according to (1) or (2), wherein the second hair bundle is longer than the first hair bundle.

(Effects of the Invention)

According to the toothbrush of the present invention, the oral cavity can be cleaned satisfactorily while applying a sufficient amount of the oral preparation to the interdental portion or the cervical portion.

1A is a plan view of a toothbrush according to a first embodiment of the present invention.
1B is a cross-sectional view taken along line B1-B1 of FIG. 1A.
2 is a front view showing an example of a branch hair.
3 is a front view showing an example of a branch hair.
4A is a plan view of a toothbrush according to a second embodiment of the present invention.
4B is a cross-sectional view taken along line B4-B4 of FIG. 4A.

(First embodiment)

A toothbrush according to a first embodiment of the present invention will be described below with reference to Figs. 1A and 1B.

The toothbrush 1 shown in FIGS. 1A and 1B includes a long handle portion 3 and a head portion 2 formed extending from the handle portion 3, and a hair transplantation surface 20 of the head portion 2 ) Is provided with a first hair bundle group 30 and a second hair bundle group 40.

In Figs. 1A and 1B, reference numeral 22 denotes one edge of the head portion 2 in the width direction, and reference numeral 24 denotes the other edge of the head portion 2 in the width direction.

The width direction of the head portion 2 is a direction perpendicular to the direction (longitudinal direction) from the front end 21 of the head portion to the handle portion 3 when viewed in plan.

The first hair bundle group 30 is installed approximately in the center of the hair transplant surface 20, and is installed in 2 rows by 5 rows from the head end 21 toward the handle part 3 to the first hair bundle 32. Consists of. In this embodiment, one first hair bundle group 30 is formed by the ten first hair bundles 32. "Column" represents the number of hair bundles arranged in the width direction of the head portion 2, and "row" is a unit arranged in the length direction of the head portion 2. The approximate center of the hair transplant surface 20 is 10 mm to 24 mm from the tip 21 of the head 2 toward the handle, and one edge of the head 2 in the width direction of the head 2 From 3.8mm to 8.2mm.

The second hair bundle group 40 is composed of 20 second hair bundles 42 planted around the first hair bundle group 30 in one layer. In this embodiment, the hair bundle closest to the side edge 22 or 24 is the second hair bundle 42.

Between the second hair bundle group 40 and the head portion tip 21, the third hair bundles 52 are arranged in 2 rows x 1 row and 3 rows x 1 row in order from the head portion tip 21. Between the second hair bundle group 40 and the handle part 3, a third hair bundle 52 is installed in three rows by one row.

In this way, the first hair bundle 32, the second hair bundle 42, and the third hair bundle 52 are planted to form the brush portion 4.

A second modulus group 40 having a center pitch P3 and P4 around the first modifier group 30 that the second modifier group 40 surrounds the first modifier group 30 Means to be located.

In the toothbrush 1, the head 2 and the handle 3 are integrally molded in a long shape as a whole (hereinafter, the head 2 and the handle 3 are integrally molded, which is referred to as a handle body. In some cases], the head portion 2 and the handle portion 3 are obtained by injection molding resin, for example.

The resin constituting the handle body is determined in consideration of the rigidity and mechanical properties required for the toothbrush 1, and for example, a high hardness resin having a bending modulus (JIS K7203) in the range of 500 to 3000 MPa is exemplified. . Examples of such high-hardness resins include polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexylenedimethylene terephthalate (PCT), polyacetal (POM), and polystyrene. (PS), acrylonitrile-butadiene-styrene resin (ABS), cellulose propionate (CP), polyarylate, polycarbonate, or acrylonitrile-styrene copolymer resin (AS), and the like. These may be used individually by 1 type, and may be used in combination of 2 or more types.

Further, the handle portion 3 may be partially or entirely covered with a flexible resin such as an elastomer.

The size of the head portion 2 can be determined in consideration of operability in the oral cavity and the like, and is, for example, 10 to 15 mm in width, 15 to 40 mm in length, and 4 to 8 mm in thickness.

The first hair bundle 32 is planted in a hair transplant hole 34 formed in the head portion 2. In this embodiment, the first hair bundle 32 has a cylindrical shape.

The number of bristles (the number protruding from the hair transplant hole 34) in one first hair bundle 32 is not particularly limited, and, for example, 4 to 100 are preferable.

The first hair bundle 32 has bristles (so-called branch hairs) with a branched tip. Since the first hair bundle 32 has a branch hair, the oral preparation can be maintained at the branch portion of the branch hair.

As the branch hair, a conventionally known one can be used, for example, a feathered bristle that has been cut to the tip of a hollow filament, or a tapered branch that shrinks as each branched branch faces the tip. And among them, feathered bristles are preferred.

An example of a feathered bristle is shown in FIG. 2. In the branch hair 70 of FIG. 2, two or more branch portions 74 are formed at the tip end of the cylindrical body portion 72.

Examples of the feathered bristles include those described in Japanese Unexamined Patent Application Publication No. 2005-131059 or the like.

An example of a taper branch hair is shown in FIG. In the branch hair 80 of FIG. 3, three branch portions 84 are formed at the front end of the trunk portion 82 having a three-leaf clover shape in cross section. The cross section of each branch portion 84 is circular, and each branch portion 84 is reduced in diameter toward the tip end.

As a taper branch hair, Japanese Patent Application Publication No. 2003-339445, Japanese Patent Application Publication No. 2010-82094, Japanese Patent Application Publication No. 2003-199626, Japanese Patent Application Publication No. 2001-169827, Japanese Patent Application Publication No. Hei 9-98837, Those described in JP-A-3547672, JP-A-2003-339445, JP-2013-39268A, and the like can be mentioned.

The material of the branch hair is appropriately determined in consideration of the method of manufacturing the branch hair, for example, polyamide such as 6-12 nylon or 6-10 nylon, PET, polybutylene terephthalate (PBT), and polytrimethylene terephthalate ( PTT), polyethylene naphthalate (PEN), polyester such as polybutylene naphthalate (PBN), polyolefin such as PP, or synthetic resin material such as an olefin elastomer, or an elastomer such as a styrene elastomer may be used. These synthetic resin materials may be used alone or in combination of two or more.

The shape of the cross-section of the trunk portion of the branch hair is not particularly limited, and examples thereof include a round shape such as a round shape or an oval shape; Polygons such as triangles, squares, pentagons, or stars; And a three-leaf clover type or a four-leaf clover type. The shape of the cross section of the trunk of all branch hairs may be the same or different from each other.

The thickness of the trunk portion of the branch hair is not particularly limited, and for example, when the cross section is circular, 3 to 12 mils (1 mil = 1/1000 inch = 0.025 mm) are preferable, and 4 to 10 mils are more preferable. The thickness of all branch hairs may be the same or different.

The shape of the cross section of the branch portion of the branch hair is not particularly limited, and examples thereof include a round shape such as a round shape or an elliptical shape; Polygons such as triangles, squares, pentagons, or stars; And a three-leaf clover type or a four-leaf clover type. The shapes of the cross-sections of all branches may be the same or different from each other.

Although the number of branching parts of the branch hair is not particularly limited, for example, 3 to 20 are preferable, and 7 to 15 are more preferable. If the number of branches is less than 3, there is a concern that the time for holding the oral formulation may be shortened, and when the number of branches is more than 20, the branches become too soft and the cleaning effect may be deteriorated. If the number of branch portions of the branch hair is 3 to 20, a sufficient amount of the oral preparation can be maintained in the branch portion for a long time, and the branch portion is not too soft to increase the cleaning effect.

The length from the boundary between the branch and the trunk to the tip of the branch hair, that is, the length of the branch (h1 in Fig. 2, h2 in Fig. 3) is not particularly limited, but is preferably 0.5 to 10 mm, for example, 2 to 5 mm. Is more preferable. If the length of the branch is less than 0.5 mm, there is a concern that the amount of the oral preparation that can be maintained may decrease, and if the length of the branch is more than 10 mm, the branch is too soft and the cleaning effect may be lowered. If the length of the branch is 0.5 to 10 mm, a sufficient amount of the oral preparation can be maintained in the branch for a long time, and the branch does not become too soft, thereby increasing the cleaning effect.

The length (i.e., hair length) H1 from the hair transplant surface 20 to the tip of the first hair bundle 32 is determined in consideration of the thickness R1 of the first hair bundle 32, for example, 6 ~13mm is preferable. The length H1 of all the first hair bundles 32 may be the same or different from each other.

The thickness R1 of the first hair bundle 32 is determined in consideration of the length H1 of the first hair bundle 32, and is preferably 1 to 3 mm, for example. The thickness R1 of all the first hair bundles 32 may be the same or different from each other. The thickness R1 of the first hair bundle 32 is the thickness of the first hair bundle 32 on the hair transplant surface 20.

The pitch P1 between the centers of the first hair bundles 32 in the longitudinal direction of the head portion 2 is appropriately determined in consideration of the size of the hair transplant holes 34 and the hair transplant pattern. The center pitch P1 is the length between the centers of the first hair bundles adjacent in the length direction of the head part 2 in the first hair bundle 32, and is preferably 2.0 mm to 4.0 mm, and 2.5 It is more preferable that mm to 4.0 mm, and even more preferably from 2.5 mm to 3.5 mm.

The pitch P2 between the centers of the first hair bundles 32 in the width direction of the head portion 2 is appropriately determined in consideration of the size of the hair transplanting holes 34, the hair transplantation pattern, and the like. The center pitch P2 is the length between the centers of the first hair bundles adjacent in the width direction of the head part 2 in the first hair bundle 32, preferably 1.5 mm to 4.0 mm, and 1.5 Mm to 3.0 mm are more preferable, and 2.0 mm to 3.0 mm are still more preferable.

The first hair bundle 32 may contain bristles other than branch hairs.

The bristles other than the branch hair are the same as the bristles constituting the second hair bundle 42 to be described later.

The ratio of branching hairs represented by [the number of branch hairs in one first hair bundle 32]/[the number of bristles constituting one first hair bundle 32] is preferably 0.5 or more, and more than 0.7. It is preferable, 0.8 or more is more preferable, 0.9 or more is especially preferable, and 1 may be sufficient. If the branch hair ratio is 0.5 or more, the oral preparation can be maintained in a larger amount and for a longer period of time.

The hair planting density in the first hair bundle group 30 is preferably 500 to 5000 pieces/cm 2, and more preferably 700 to 2000 pieces/cm 2. If the flocking density is less than 500 pieces/cm2, there is a concern that the amount of oral preparation that can be maintained may decrease, and if the flocking density is more than 5000 pieces/cm2, the amount of curvature of the first hair bundle 32 is limited to excessive cleaning. There is a fear that the effect will be reduced. If the flocking density is 500 to 5000 pieces/cm 2, a sufficient amount of the oral preparation can be maintained, and the amount of warpage of the first hair bundle 32 is not limited to an excessive amount, thereby increasing the cleaning effect.

The hair removal density of the first hair bundle group 30 is obtained by dividing the number of bristles planted in the first hair bundle group 30 by the hair planting area of the first hair bundle group 30. The hair transplantation area of the first hair bundle group 30 is an area surrounded by an imaginary line T1 connecting the outer sides of the hair growth holes 34 in which the first hair bundles 32 are planted with the shortest length.

In addition, in the first hair bundle group 30, the tip density obtained by dividing the number of the tip portions of the bristles by the hair planting area of the first hair bundle group 30 is preferably 1000-16000 pieces/cm2, and more than 2000-10000 pieces/cm2. It is preferable, 2000-8000 pieces/cm<2> are more preferable, and 5000-8000 pieces/cm<2> are especially preferable. If the tip density is less than 1000 pieces/cm2, there is a concern that the amount of oral formulations that can be maintained may decrease, and when the tip density is more than 16000 pieces/cm2, the amount of curvature of the first hair bundle 32 is limited to excessive cleaning. There is a fear that the effect will be reduced. If the tip density is 1000 to 16000 pieces/cm2, a sufficient amount of the oral formulation can be maintained, and the amount of warpage of the first hair bundle 32 is not limited to an excessive amount, thereby increasing the cleaning effect.

In the present invention, the tip of the bristle is a portion within 5 mm, preferably within 3 mm, from the tip of the bristle.

The area ratio of the first hair bundle group represented by [the hair growth area of the first hair bundle group]/[the hair growth area of the brush portion] is preferably 0.10 to 0.80, more preferably 0.20 to 0.80, and even more preferably 0.20 to 0.50. If the area ratio of the first hair bundle group is less than 0.10, there is a concern that the amount of the oral preparation that can be maintained may decrease, and when the area ratio of the first hair bundle group exceeds 0.80, the second hair bundle 42 becomes too small. There is a fear that the cleaning effect may be deteriorated. If the area ratio of the first hair bundle group is 0.10 to 0.80, a sufficient amount of the oral preparation can be maintained, and the second hair bundle 42 does not become too small to increase the cleaning effect.

The hair transplantation area of the brush part 4 is an area surrounded by an imaginary line T0 connecting the outer sides of the hair transplantation holes formed in the head part 2 with the shortest length.

The second hair bundle 42 is planted in a hair transplant hole 44 formed in the head portion 2. In this embodiment, the second hair bundle 42 has a cylindrical shape.

The number of bristles in one second hair bundle 42 (the number protruding from the hair transplant hole 44) is not particularly limited, and, for example, 15 to 50 are preferred.

The second hair bundle 42 is provided with bristles (non-branched hair) other than branch hair. The second hair bundle 42 may clean the object to be cleaned with a stronger force by providing a non-branching hair.

Non-branching hairs include bristles (taper hairs) that shrink toward the tip of the hair, bristles having almost the same outer diameter (straight hairs) except for the rounded portions of the hair tips, spiral-shaped bristles, and crimp-shaped bristles. The non-branching hair constituting the second hair bundle 42 is appropriately determined according to the effect required for the second hair bundle 42, and, for example, a tapered hair is preferable when the removal of contamination of the interdental or cervical areas is important. Further, for example, when emphasis is placed on whitening the tooth surface, a straight hair or the like is preferable.

The material of the non-branching hair is the same as the material of the branch hair. In addition, the non-branching hairs include bristles having a multi-core sheath structure having a core portion and at least one layer of sheath portions formed outside the core portion. The bristles of the multi-core sheath structure can use different materials in the core and the sheath, so it is easy to adjust the mechanical properties. For this reason, the bristles of the multi-core sheath structure have strong bristle elasticity and a bristle with higher scrapability of tartar.

The shape of the cross section of the non-branching hair is the same as the shape of the cross section of the trunk portion of the branch hair. The shape of the cross section of the non-branching hair may be the same as or different from the shape of the cross section of the branch hair.

The thickness of the non-branching hair is determined in consideration of the material, etc., and is the same as the thickness of the body of the branch hair. The thickness of the non-branching hair may be the same as or different from the thickness of the trunk of the branch hair.

The length (ie, hair length) H2 from the hair transplant surface 20 to the tip end of the second hair bundle 42 is determined in consideration of the type of bristle and the like, and is preferably 6 to 13 mm, for example. The length H2 of all the second hair bundles 42 may be the same or different from each other.

The length (H2) of the second hair bundle (42) is preferably equal to the length (H1) of the first hair bundle (32) or longer than the length (H1) of the first hair bundle (32), and It is more preferable that it is longer than the length (H1) of the bundle (32). If the second hair bundle 42 is longer than the first hair bundle 32, the oral preparation is more likely to be maintained in the first hair bundle group 30. In addition, if the second hair bundle 42 is longer than the first hair bundle 32, the second hair bundle 42 is likely to penetrate the interdental or cervical region, so that the interdental or cervical region can be better cleaned.

When the length H2 of the second hair bundle 42 is longer than the length H1 of the first hair bundle 32, the difference in hair length H3 calculated by H2-H1 is preferably 0.5-2 mm, 1-2 mm is more preferable. When the hair length difference H3 is less than 0.5 mm, the effect of making the second hair bundle 42 longer than the first hair bundle 32 is difficult to obtain, and when the hair length difference H3 is more than 2 mm, the first hair bundle (32) It becomes difficult to enter the tooth interdental or cervical region. If the hair length difference (H3) is 0.5 to 2 mm, the oral preparation is easy to be maintained by the first hair bundle 30, and the second hair bundle 42 is more likely to invade the interdental or cervical region, and more It can be cleaned well.

The thickness R2 of the second hair bundle 42 is determined in consideration of the length H2 of the second hair bundle 42, and for example, 1 to 3 mm is preferable, and 1.5 to 2 mm is more preferable. Do. If the thickness R2 of the second hair bundle 42 is less than 1 mm, the second hair bundle 42 becomes too soft, and the cleaning effect may be deteriorated. When the thickness (R2) of the second hair bundle 42 is more than 3 mm, the second hair bundle 42 becomes difficult to bend, and the bristles constituting the second hair bundle 42 become difficult to enter the interdental or cervical area, so cleaning There is a fear that the effect will be reduced. If the thickness (R2) of the second hair bundle 42 is 1 to 3 mm, the second hair bundle 42 does not become too soft, and the second hair bundle 42 is easily bent, and the second hair bundle 42 The bristles constituting the are more likely to enter the interdental or cervical areas, thereby increasing the cleaning effect.

The thickness R2 of all the second hair bundles 42 may be the same or different from each other. The thickness R2 of the second hair bundle 42 may be the same as or different from the thickness R1 of the first hair bundle 32.

From the viewpoint of further enhancing the cleaning effect, the thickness R2 of the second hair bundle 42 is preferably thinner than the thickness R1 of the first hair bundle 32.

The pitch P3 between the centers of the second hair bundles 42 in the longitudinal direction of the head portion 2 is appropriately determined in consideration of the size of the hair transplanting holes 44, the hair transplant pattern, and the like. The center pitch P3 is the length between the centers of the second hair bundles adjacent in the length direction of the head portion 2 in the second hair bundle 42, preferably 1.5 mm to 4.0 mm, and 1.5 Mm to 3.0 mm are more preferable, and 2.0 mm to 3.0 mm are still more preferable.

The pitch P4 between the centers of the second hair bundles 42 in the width direction of the head portion 2 is appropriately determined in consideration of the size of the hair transplant holes 44 and the hair transplant pattern. The center pitch P4 is the length between the centers of the second hair bundles adjacent in the width direction of the head portion 2 in the second hair bundle 42, preferably 1.5 mm to 4.0 mm, and 1.5 Mm to 3.0 mm are more preferable, and 2.0 mm to 3.0 mm are still more preferable.

The hair transplantation density in the second hair bundle 40 is preferably 200 to 1000 pieces/cm 2, and more preferably 250 to 600 pieces/cm 2. If the hair removal density in the second hair bundle group 40 is less than 200 pieces/cm2, the elasticity of each second hair bundle group 40 may be too weak to reduce the cleaning effect, and the second hair bundle group 40 If the hair removal density in) exceeds 1000 pieces/cm 2, the amount of warpage of the second hair bundle 42 is excessively limited, and the cleaning effect may be lowered.

The hair transplantation density of the second hair bundle group 40 is obtained by dividing the number of bristles of the second hair bundle group 40 by the hair transplant area of the second hair bundle group 40. The hair transplantation area of the second hair bundle group 40 is an imaginary line T2 connecting the outside of the hair transplant hole 44 in which the second hair bundle 42 is planted with the shortest length, and the inside of the hair transplant hole 44 It is the area of the area surrounded by the virtual line T3 connecting each other with the shortest length.

The hair growth density ratio represented by [Flocking density of the first hair bundle group 30]/[The hair growth density of the second hair bundle group 40] is preferably 1.0 to 5.0, and more preferably 1.2 to 4.0. If the flocking density ratio is less than 1.0, there is a concern that the amount of the oral preparation that can be maintained may decrease, and if the flocking density ratio is more than 5.0, the oral preparation held in the first hair bundle group 30 is liable to be lost. If the hair density ratio is 1.0 to 5.0, a sufficient amount of the oral formulation can be maintained, and the oral formulation maintained in the first hair bundle 30 is difficult to be lost.

The third hair bundle 52 is planted in a hair transplant hole 54 formed in the head portion 2. In this embodiment, the third hair bundle 52 has a cylindrical shape.

The number of bristles in one third hair bundle 52 (the number protruding from the hair transplant hole 54) is not particularly limited, and, for example, 15 to 50 are preferable.

The length of the third hair bundle 52 is determined in consideration of the type of bristle and the like, and is preferably 6 to 13 mm, for example. The length of the third hair bundle 52 may be the same as or different from the length H1 of the first hair bundle 32. The length of the third hair bundle 52 may be the same as or different from the length H2 of the second hair bundle 42.

The thickness R3 of the third hair bundle 52 is determined in consideration of the type of bristle and the like, and is preferably 1 to 3 mm, for example.

The thickness R3 of the third hair bundle 52 may be the same as or different from the thickness R1 of the first hair bundle 32. The thickness R3 of the third hair bundle 52 may be the same as or different from the thickness R2 of the second hair bundle 42.

The third hair bundle 52 may be composed of branched hairs, non-branched hairs, or mixed.

The method for manufacturing the toothbrush 1 of the present embodiment can use a conventionally known method, for example, a flat wire type in which the hair bundle is planted by folding the hair bundle in two and inserting the flat wire sandwiched between them into the hair transplant hole. A thermal fusion method in which the lower end of the hair or hair bundle is press-fit into the molten resin serving as the hair growth part to fix it, or the in-mold method in which the molten resin is injected into the mold after forming a molten lump by heating the lower end of the hair bundle to form the hair growth part. have.

A method of using the toothbrush 1 of this embodiment will be described.

An oral preparation such as a skirt agent is applied to the brush portion 4, and the brush portion 4 is placed in the oral cavity. The toothbrush 1 is reciprocated in the longitudinal direction of the head 2. At this time, the first hair bundle 32 enters the interdental portion or the cervical portion, applies the oral formulation to the interdental portion or the cervical portion, and scrapes the calculus in the interdental portion or the cervical portion. In addition, the second hair bundle 42 having a non-branching hair having a strong elasticity at the tip end compared to the branch hair brushing the tooth surface, the interdental portion or the cervical portion with a strong pressure.

In addition, when cleaning the occlusal surface of the molar teeth, the second hair bundle 40 slides on the teeth while covering the molars, and the first hair bundle 30, which holds the oral preparation, scrapes off contamination attached to the interdental part or the occlusal surface. .

While the oral cavity is being cleaned, the oral preparation is not immediately diffused even if it is diluted with saliva or the like in the oral cavity, and is maintained at the branch of the branch hairs constituting the first hair bundle 32. In addition, when the second hair bundle 42 is longer than the first hair bundle 32, the oral formulation maintained in the first hair bundle group 30 is prevented from flowing outward. In addition, a sufficient amount of the oral preparation can be continuously applied to the target site over a long period of time.

According to the present embodiment, since the first hair bundle group 30 is composed of the first hair bundle 32 having branch hair, the oral preparation is held at the branch portion of the branch hair. Since bifurcation hairs are easy to enter into the cervical or interdental areas, the oral preparation held in the bifurcation is easily applied to the cervical or interdental areas.

In addition, according to the present embodiment, since the first hair bundle group 30 and the second hair bundle group 40 are provided, an active ingredient (for example, isopropylmethylphenol) in the oral formulation mainly in the first hair bundle group 30 Etc.), while maintaining a high concentration, the active ingredient can be efficiently sent to the narrow part of the oral cavity, such as the cervical region, to the second hair bundle 42.

In addition, since the tip portion of the second hair bundle 42 is not branched, the hair elasticity of the tip portion is strong, so that contamination of the tooth surface or occlusal surface, and contamination of the interdental portion or the cervical portion can be easily scraped.

(2nd embodiment)

A toothbrush according to a second embodiment of the present invention will be described below with reference to FIGS. 4A and 4B.

The same components as in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted, and differences from the first embodiment will be mainly described.

The toothbrush 100 shown in FIGS. 4A and 4B is a first hair bundle group (the front first hair bundle group) provided between the center of the maximum width in the longitudinal direction of the hair transplant surface 20 and the tip 21 of the head. ) 130 and a first hair bundle group (may be referred to as a rear first hair bundle group) 132 provided between the front first hair bundle group 130 and the handle part 3. The front first hair bundle group 130 is surrounded by the second hair bundle 42, and the rear first hair bundle group 132 is surrounded by the second hair bundle 42. That is, this embodiment differs from the first embodiment in that it includes two first hair bundles.

The brush part 104 is composed of a first hair bundle 32, a second hair bundle 42, and a third hair bundle 52.

The front first hair bundle group 130 is composed of first hair bundles 32 planted in two rows by two rows.

A second hair bundle group (may be referred to as a front second hair bundle group) 140 is formed by twelve second hair bundle groups 42 surrounding the front first hair bundle group 130 in one layer.

The rear first hair bundle group 132 is composed of first hair bundles 32 planted in two rows by two rows.

A second hair bundle group (may be referred to as a rear second hair bundle group) 142 is formed by twelve second hair bundle groups 42 surrounding the rear first hair bundle group 132 in one layer.

A third hair bundle 52 is installed in three rows by one row between the front end 21 and the front second hair bundle 140.

Between the rear second hair bundle group 142 and the handle part 3, a third hair bundle 52 is installed in three rows by one row.

The hair transplantation density of the front first hair bundle group 130 is the same as that of the first hair bundle group 30 of the first embodiment. The hair removal area of the front first hair bundle group 130 is an imaginary line (T11) that connects the outer sides of the hair removal hole 34 in which the first hair bundle 32 of the front first hair bundle group 130 is planted with the shortest length. It is the area of the area surrounded by ).

The hair transplantation density of the rear first hair bundle group 132 is the same as that of the first hair bundle group 30 of the first embodiment. The hair transplantation area of the rear first hair bundle group 132 is a virtual line (T12) connecting the outer sides of the hair transplant hole 34 in which the first hair bundle 32 of the rear first hair bundle group 132 is planted with the shortest length. It is the area of the area surrounded by ).

In this embodiment, the area ratio of the first hair bundle group represented by [the first hair bundle group hair transplant area]/[the brush part hair growth area] is the same as that of the first embodiment. However, in this embodiment, "the hair transplantation area of the first hair bundle group" is the sum of the hair transplant area of the front first hair bundle group 130 and the hair transplant area of the rear first hair bundle group 132.

The hair transplantation density of the front second hair bundle group 140 is the same as that of the second hair bundle group 40 of the first embodiment. The hair removal area of the front second hair bundle group 140 is a virtual line (T13) connecting the outer sides of the hair removal hole 44 in which the second hair bundle 42 of the front second hair bundle group 140 is planted with the shortest length. ), and a virtual line T14 connecting the insides of the hair transplant holes 44 to each other with the shortest length.

The hair transplantation density of the rear second hair bundle group 140 is the same as that of the second hair bundle group 40 of the first embodiment. The hair growth area of the front second hair bundle group 142 is an imaginary line (T15) that connects the outer sides of the hair transplant hole 44 in which the second hair bundle 42 of the front second hair bundle group 142 is planted with the shortest length. ), and a virtual line T16 connecting the insides of the hair transplanting holes 44 with the shortest length.

The hair growth density ratio represented by [flocking density of the front first hair bundle group 130]/[the hair growth density of the front second hair bundle group 140] is preferably 1.0 to 5.0, and more preferably 1.0 to 4.0. If the flocking density ratio is less than 1.0, there is a concern that the amount of the oral preparation that can be maintained may decrease, and if the flocking density ratio is higher than 5.0, the oral preparation held in the front first hair bundle group 130 is likely to be lost.

If the hair density ratio is 1.0 to 5.0, a sufficient amount of the oral preparation can be maintained, and it is difficult to lose the oral preparation maintained in the front first hair bundle 130.

The hair growth density ratio represented by [flocking density of the rear first hair bundle group 132]/[the hair growth density of the rear second hair bundle group 142] is preferably 1.0 to 5.0, and more preferably 1.0 to 4.0. If the flocking density ratio is less than 1.0, there is a concern that the amount of the oral preparation that can be maintained may decrease, and if the flocking density ratio is higher than 5.0, the oral preparation held in the rear first hair bundle group 132 is liable to be lost.

If the hair density ratio is 1.0 to 5.0, a sufficient amount of the oral formulation can be maintained, and it is difficult to lose the oral formulation maintained in the rear first hair bundle group 132.

(Other embodiments)

The present invention is not limited to the above embodiment.

In the first embodiment, a third hair bundle is installed between the second hair bundle group and the tip end of the head portion. 3 Hair bundles are planted in 3 rows by 1 row. The present invention is not limited to this, and the number of the third hair bundles planted between the second hair bundle group and the tip of the head portion is determined in consideration of the size of the head portion and the like, and may be 4 or more rows or 2 or less rows. In addition, two or more rows of third hair bundles installed between the second hair bundle group and the tip of the head portion may or may not be present.

In the first and second embodiments, the third hair bundle is installed in 3 rows by 1 row between the second hair bundle group and the handle part. The present invention is not limited to this, and the third hair bundle installed between the second hair bundle group and the handle portion is determined in consideration of the size of the head portion and the like, and may be 4 or more rows or 2 or less rows. In addition, two or more rows of third hair bundles installed between the second hair bundle group and the handle portion may or may not be present.

In the first embodiment, the first hair bundle is constituted by ten first hair bundles, but the present invention is not limited to this, and the first hair bundle group may be constituted by 1 to 9 first hair bundles, The first hair bundle may be constituted by 11 or more hair bundles.

In the second embodiment, one first hair bundle is constituted by four first hair bundles, but the present invention is not limited to this, and even if the first hair bundle group is constituted by one to three first hair bundles. good. The first hair bundle may be constituted by five or more first hair bundles.

However, from the viewpoint of increasing the maintenance amount of the oral preparation, the number of first hair bundles constituting one first hair bundle group is preferably 4 to 15 pieces.

In the second embodiment, two first hair bundle groups are provided, but the present invention is not limited to this, and the number of the first hair bundle groups may be three or more. However, from the viewpoint of further enhancing the cleaning effect while increasing the amount of maintenance of the oral preparation, the number of the first hair bundles is preferably 2 to 4, and more preferably 2 to 3.

When two or more first hair bundles are provided, the number of first hair bundles constituting each first hair bundle group may be the same or different.

In the second embodiment, the front first hair bundle group and the rear first hair bundle group are provided, but the present invention is not limited to this, and only one of the front first hair bundle group and the rear first hair bundle group may be provided.

In the first and second embodiments, the first to third hair bundles have a cylindrical shape, but the present invention is not limited thereto, and the first to third hair bundles have a triangular column shape, a square column shape, a pentagonal column shape, etc. It may be in the shape of a polygonal column.

When the hair bundle has a shape other than a cylindrical shape, the thickness of the hair bundle is the diameter of the circumscribed circle of the cross section of the hair bundle.

The shapes of the first to third hair bundles may be the same or different from each other.

As a toothbrush of another aspect of the present invention,

In the toothbrush having a handle portion having a head portion formed at the tip, and having two or more hair bundles formed by tying two or more bristles on the hair transplant surface of the head portion,

A first hair bundle group having a first hair bundle having a branched tip portion, and a second hair bundle group surrounding the first hair bundle group, and a second hair bundle having a bristles having a non-branched tip portion. ,

The bristles from which the tip is branched are feathered bristles,

The bristles at which the tip is not branched are tapered or straight hairs,

The first hair bundle has a thickness of 1 to 3 mm,

The thickness of the second hair bundle is 1 to 3 mm,

The flocking density of the first hair bundle group is 500 to 5000 pieces/cm 2,

The hair growth density of the second hair bundle group is 200-1000 pieces/cm2,

The hair growth density ratio obtained by dividing the hair growth density of the first hair bundle group by the hair growth density of the second hair bundle group is 1.0 to 5.0,

In the first hair bundle, a length between the centers of the first hair bundles adjacent in the length direction of the head portion is 2.0 mm to 4.0 mm,

In the first hair bundle, the length between the centers of the first hair bundles adjacent in the width direction of the head portion is 1.5 mm to 4.0 mm,

In the second hair bundle, the length between the centers of the second hair bundles adjacent in the length direction of the head portion is 1.5 mm to 4.0 mm,

In the second hair bundle, the length between the centers of the second hair bundles adjacent in the width direction of the head portion is 1.5 mm to 4.0 mm,

The second hair bundle is longer than the first hair bundle,

It is preferable that the difference between the length of the second hair bundle and the length of the first hair bundle is 0.5 to 2 mm.

As a toothbrush of another aspect of the present invention,

In the toothbrush having a handle portion having a head portion formed at the tip, and having two or more hair bundles formed by tying two or more bristles on the hair transplant surface of the head portion,

Two first hair bundle groups in which a first hair bundle having a bristles branched at the tip end is installed, and a second hair bundle group in which a second hair bundle having a bristles with no branched tips surrounding the first hair bundle group is installed. Equipped,

The first hair bundle group includes a front first hair bundle group installed between the center of the hair transplant surface and a tip end of the head portion, and a rear first hair bundle group provided between the front first hair bundle group and the handle part,

The front first hair bundle group is surrounded by a front second hair bundle group with the second hair bundle, and the rear first hair bundle group is surrounded by a rear second hair bundle group with the second hair bundle,

The bristles from which the tip is branched are feathered bristles,

The bristles at which the tip is not branched are tapered or straight hairs,

The first hair bundle has a thickness of 1 to 3 mm,

The thickness of the second hair bundle is 1 to 3 mm,

The flocking density of the front first hair bundle group is 500-5000 pieces/cm2,

The hair growth density of the rear first hair bundle group is 500-5000 pieces/cm2,

The hair growth density of the front second hair bundle group is 200-1000 pieces/cm2,

The hair growth density of the rear second hair bundle group is 200-1000 pieces/cm2,

The hair growth density ratio obtained by dividing the hair growth density of the first hair bundle group by the hair growth density of the front second hair bundle group is 1.0 to 5.0,

The hair growth density ratio obtained by dividing the hair growth density of the rear first hair bundle group by the hair growth density of the rear second hair bundle group is 1.0 to 5.0,

In the first hair bundle, a length between the centers of the first hair bundles adjacent in the length direction of the head portion is 2.0 mm to 4.0 mm,

In the first hair bundle, the length between the centers of the first hair bundles adjacent in the width direction of the head portion is 1.5 mm to 4.0 mm,

In the second hair bundle, the length between the centers of the second hair bundles adjacent in the length direction of the head portion is 1.5 mm to 4.0 mm,

In the second hair bundle, the length between the centers of the second hair bundles adjacent in the width direction of the head portion is 1.5 mm to 4.0 mm,

The second hair bundle is longer than the first hair bundle,

It is preferable that the difference between the length of the second hair bundle and the length of the first hair bundle is 0.5 to 2 mm.

Example

Hereinafter, although an Example is shown and this invention is demonstrated in detail, this invention is not limited by the following description.

(Material used)

Branch hair: feathered bristles. The tip of Tynex 0900HA (manufactured by Dupont Company) is cut with a cutter from 1 to 5 mm. Number of branches = 5 to 15. The cross section of the trunk is circular.

Non-branched hair a: Tapered hair, made of PBT. The cross section is circular.

Non-branched hair b: Straight hair, made of polyamide. The cross section is circular.

(Assessment Methods)

<Formulation retention>

1g of chimaje was placed on the hair transplant part of the toothbrush. The plastic plate was brushed for 90 seconds at the hair transplant part on which the skirt was placed (load: 200 g, speed: 160 strokes/min). Thereafter, the mass of the toothbrush before 1g of the dentifrice is placed is controlled by weight, the mass of the toothbrush after brushing is measured to determine the mass (remaining amount) of the dentifrice remaining in the hair stylus, and the remaining amount by the following formula (i) I found the rate. The obtained residual ratio was classified according to the following evaluation criteria to evaluate the formulation retention.

Remaining ratio (mass%) = Remaining amount (g) ÷ 1g × 100...(i)

≪Evaluation criteria≫

A: The residual rate is 35% or more.

B: The residual ratio is 30 mass% or more and less than 35 mass%.

C: The residual ratio is 20 mass% or more and less than 30 mass%.

D: The residual ratio is 15 mass% or more and less than 20 mass%.

E: The residual ratio is less than 15% by mass.

<Cleaning effect>

Ten subjects cleaned the oral cavity using the toothbrush of each case. The feeling of cleaning at that time was scored according to the criteria for judging. The average value of the scores of 10 persons was classified according to the following evaluation criteria, and the cleaning effect was evaluated.

≪Judgment Criteria≫

5 points: The cleaning effect is very felt.

4 points: The cleaning effect is felt.

3 points: The cleaning effect is slightly felt.

2 points: The cleaning effect is hardly felt.

1 point: No cleaning effect is felt.

≪Evaluation criteria≫

A: Average score is 3.5 or higher.

B: Average score is 3 points or more and less than 3.5 points.

C: Average score is 2 or more and less than 3 points.

D: The average score is 1.5 points or more and less than 2 points.

E: Average score is less than 1.5 points.

<Comprehensive evaluation>

Comprehensive evaluation was performed according to the following evaluation criteria.

≪Evaluation criteria≫

A: All evaluation of the formulation retention property and cleaning effect is "A".

B: All evaluation of the formulation retention property and cleaning effect is "B" or "A", and one or more is "B".

C: All of the evaluation of the formulation retention property and cleaning effect is "C"-"A", and one or more is "C".

D: All of the evaluation of the formulation retention property and the cleaning effect are "D" to "A", and one or more is "D".

E: There is "E" in the evaluation of formulation retention and cleaning effect.

(Examples 1, 2, 6)

In accordance with the specifications of Tables 1 to 2, hair bundles were planted on the handle body made of polypropylene to obtain toothbrushes of each example. The toothbrush of this example is the same as the toothbrush 1 of FIG. 1. In this example, the same hair bundle as the second hair bundle was used as the third hair bundle, so in the drawings showing the ``arrangement of hair bundles'' in the table, the circle ``○'' where the third hair bundle was not completely painted like the second hair bundle. Represented by.

About the obtained toothbrush, formulation retention and cleaning effect were evaluated, and the result is shown in a table. Comprehensive evaluation was made based on the results of the formulation retention and cleaning effect, and the results are shown in the table.

In the table, the pitch of the first hair bundle represents the distance between the first hair bundles (that is, the distance between the centers of the first hair bundle), and the pitch of the second hair bundle represents the distance between the second hair bundles (that is, the distance between the second hair bundles). The distance between the centers) is shown (same in the following).

(Example 3)

According to the specifications of Table 1, a toothbrush similar to the toothbrush 100 of FIGS. 4A and 4B was obtained. In this example, the same hair bundle as the second hair bundle was used as the third hair bundle. For this reason, in the drawing showing the "arrangement of hair bundles" in the table, the third hair bundle was indicated by a circle "○" that was not completely painted like the second hair bundle.

About the obtained toothbrush, formulation retention and cleaning effect were evaluated, and the result is shown in a table. Comprehensive evaluation was made based on the results of the formulation retention and cleaning effect, and the results are shown in the table.

(Examples 4 to 5)

According to the specifications of Tables 1 to 2, toothbrushes similar to those in the drawing of "Arrangement of hair bundles" were obtained. The toothbrush of this example is the same as the toothbrush 1 of Fig. 1 except that the third hair bundle (2 rows x 1 row) closest to the tip of the head is not installed. In this example, the same hair bundle as the second hair bundle was used as the third hair bundle. For this reason, in the drawing showing "arrangement of hair bundles" in the table, the 3rd hair bundle is shown as a circle "(circle)" which is not completely painted like the 2nd hair bundle.

About the obtained toothbrush, formulation retention and cleaning effect were evaluated, and the result is shown in a table. Comprehensive evaluation was made based on the results of the formulation retention and cleaning effect, and the results are shown in the table.

(Example 7)

According to the specifications of Table 2, a toothbrush similar to the drawing of "Arrangement of hair bundles" was obtained. In the toothbrush of this example, the first hair bundle is planted in 1 row x 1 row and 2 rows x 7 rows in order from the tip of the head to form the first hair bundle, and 21 second hair bundles surround the first hair bundle group. Has been.

About the obtained toothbrush, formulation retention and cleaning effect were evaluated, and the result is shown in a table. Comprehensive evaluation was made based on the results of the formulation retention and cleaning effect, and the results are shown in the table.

(Comparative Example 1)

A toothbrush was obtained in the same manner as in Example 4, except that the first hair bundle was constituted by tapered hairs and the second to third hair bundles were constituted by branch hairs.

About the obtained toothbrush, formulation retention and cleaning effect were evaluated, and the result is shown in a table. Comprehensive evaluation was made based on the results of the formulation retention and cleaning effect, and the results are shown in the table.

(Comparative Example 2)

According to the specifications of Table 3, a toothbrush similar to the drawing of "Arrangement of hair bundles" was obtained. In the toothbrush of this example, a first hair bundle composed of branch hairs is planted in 1 row x 8 rows in the center of the hair transplant surface, and a second hair bundle composed of tapered hairs is installed on both sides of the toothbrush.

About the obtained toothbrush, formulation retention and cleaning effect were evaluated, and the result is shown in a table. Comprehensive evaluation was made based on the results of the formulation retention and cleaning effect, and the results are shown in the table.

(Comparative Example 3)

According to the specifications of Table 3, a toothbrush similar to the drawing of "Arrangement of hair bundles" was obtained. The toothbrush of this example uses a first hair bundle consisting of branch hairs and a second hair bundle consisting of tapered hairs, and the second hair bundle is 3 rows × 1 row, 4 rows × 1 row, and the first hair bundle is 4 in order from the tip of the head. Column x 1 row, 2nd hair bundle 4 columns x 1 row, 1st hair bundle 4 columns x 1 row, 2nd hair bundle 4 columns x 1 row, 1st hair bundle 4 columns x 1 row, 2nd hair bundle 4 It is planted in columns × 1 row and 3 columns × 1 row.

About the obtained toothbrush, formulation retention and cleaning effect were evaluated, and the result is shown in a table. Comprehensive evaluation was made based on the results of the formulation retention and cleaning effect, and the results are shown in the table.

(Comparative Example 4)

According to the specifications of Table 3, a toothbrush similar to the drawing of "Arrangement of hair bundles" was obtained. The toothbrush of this example has the same specifications as the toothbrush of Example 2 except that all hair bundles are hair bundles having tapered hairs.

About the obtained toothbrush, formulation retention and cleaning effect were evaluated, and the result is shown in a table. Comprehensive evaluation was made based on the results of the formulation retention and cleaning effect, and the results are shown in the table.

(Comparative Example 5)

According to the specifications of Table 3, a toothbrush similar to the drawing of "Arrangement of hair bundles" was obtained. The toothbrush of this example has the same specifications as the toothbrush of Example 2 except that all hair bundles are hair bundles provided with branch hairs.

About the obtained toothbrush, formulation retention and cleaning effect were evaluated, and the result is shown in a table. Comprehensive evaluation was made based on the results of the formulation retention and cleaning effect, and the results are shown in the table.

As shown in Tables 1 to 3, all of Examples 1 to 7 to which the present invention was applied had a comprehensive evaluation of "C" to "A". That is, Examples 1 to 7 were excellent in formulation retention and cleaning effect.

Comparative Example 1 in which the first hair bundle was used as a tapered hair, Comparative Examples 2 to 3 in which the first hair bundle was not surrounded by the second hair bundle, and Comparative Example 4 in which the first hair bundle and the second hair bundle were made of tapered hair, all had formulation retention properties. It was "E" or "D".

In Comparative Example 5 in which the first hair bundle and the second hair bundle were composed of branch hair, the cleaning effect was "D".

According to the present invention, it is possible to provide a toothbrush capable of cleaning the oral cavity satisfactorily while applying a sufficient amount of the oral preparation to the interdental portion or the cervical portion.

1, 100: toothbrush 2: head
20: hair transplantation surface 30, 130, 132: first hair bundle excellent
32: first hair bundle 40, 140, 142: second hair bundle excellent
42: second hair bundle

Claims (3)

In the toothbrush having two or more hair bundles installed by tying two or more bristles to the hair growth surface of the head,
The first hair bundle group in which the first hair bundle having the bristles branched at the tip is installed, and
A second hair bundle group having a bristles that surround the first hair bundle group and having a bristles that are not branched at a tip end thereof, and a second hair bundle group installed therein,
The length of the second hair bundle is equal to or longer than the length of the first hair bundle,
In the first hair bundle group, a toothbrush having a tip density of 1000 to 16000 pieces/cm2 obtained by dividing the number of tip portions of the bristles by the hair planting area of the first hair bundle group. The method of claim 1,
The second hair bundle is a toothbrush having a bristles that are reduced in diameter toward the front end. delete

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