KR20210016326A - toothbrush - Google Patents

Abstract

Even if the head is thin, has excellent oral operability, and has a large-diameter hair bundle that has an effect such as improving the sense of massage, while suppressing the occurrence of cracking or whitening in the head, it is sufficient to secure the hair bundle by the flat line. Provide a toothbrush that can be secured. A toothbrush (1) employing flat-wire hair transplants having a resin-made handle body (1a) including a head portion (10), wherein the head portion (10) has a thickness of 2 mm or more and 4 mm or less, and a diameter of 1.8 The ratio of the first hair transplantation holes 11a of mm or more is 10% or more, and the two or more first hair removal holes 11a are arranged in the long axis direction of the handle body 1a, and a first hair transplant hole adjacent to the long axis direction ( At least one set of 11a) satisfies the condition that the ratio of the stress generation parameter P _{1 to} the major axis stress relaxation parameter P ₂ is 20 to 30%, the toothbrush 1.

Description

toothbrush

The present invention relates to a toothbrush.

This application claims priority based on Japanese Patent Application No. 2018-105172 for which it applied to Japan on May 31, 2018, and uses the content in this specification.

As a toothbrush that improves the operability of the toothbrush in the oral cavity and improves the feeling of cleaning in the area where the molar teeth in the oral cavity are narrow, a toothbrush having a thin head portion having a thickness of about 2 to 3 mm is known (Patent Document 1). As a toothbrush that can gently massage the gums, there is known a toothbrush in which a hair bundle having a diameter of 1.8 mm or more in which the brushing pressure is easily dispersed is planted in a hair transplant hole by a flat line type (Patent Document 2).

Japanese Patent Laid-Open No. 2011-4852 Japanese Patent Application Publication No. 2012-34844

However, when a large-diameter hair transplant hole is formed in the thin head part, since the depth of the hair transplant hole becomes shallow, the fixing force of the hair bundle by a flat line is low. For this reason, hair removal strength (removal strength of a hair bundle) and hair removal strength (removal strength of one hair) are reduced.

As a method of increasing the fixing power of the hair bundle, a method of lengthening the flat line can be considered, but if the flat line typed in the thin head portion is lengthened, cracks tend to occur between the flat lines typed in adjacent hair transplant holes in the head portion. , Cracking or whitening tends to occur in the head. The larger the diameter of the hair transplant hole, the greater the impact applied to the head portion during hair transplantation, so that cracking and whitening tend to occur.

In the present invention, even if the head portion is thin, has excellent oral operability, and has a large-diameter hair bundle that has an effect such as improving massage sensation, while suppressing the occurrence of cracking or whitening in the head, It is an object of the present invention to provide a toothbrush that can sufficiently secure a fixing force.

The present invention has the following configuration.

[1] A toothbrush comprising a resin-made handle body including a head portion provided with a plurality of hair transplantation holes on a hair transplant surface, and a hair growth part provided by planting hair bundles in each of the hair growth holes by a type of flat line,

The thickness of the head is 2 mm or more and 4 mm or less,

The ratio of the total number of large-diameter hair transplant holes with a diameter of 1.8 mm or more with respect to the total number of hair transplant holes provided on the hair transplant surface is 10% or more,

Two or more large-diameter hair transplant holes are arranged in the long axis direction of the handle body,

It is said that at least one set of the large-diameter hair transplantation holes adjacent to the major axis direction has a ratio of 20 to 30% of the stress generation parameter P ₁ represented by the following equation 1 to the major axis stress relaxation parameter P ₂ represented by the following equation 2 A toothbrush that meets the conditions.

P ₁ =(S _A -S _B )×h… Equation 1

P ₂ =S _C ×D… Equation 2

(However, in the formulas 1 and 2, S _A is the area (mm 2) of the circumscribed circle of the flat line, which is typed into the large-diameter hair transplant hole when viewed from the front. S _B is the opening area of the large-diameter hair transplant hole. H is the distance (mm) from the hair transplant surface to the lower end of the flat line that is typed into the large-diameter hair transplant hole when viewed from the side, S _C is the large-diameter hair transplant hole adjacent to the major axis direction. It is the area (mm 2) of each of the opening rims of, and the hair transplantation surface surrounded by two tangent lines that do not intersect with any of the adjacent large-diameter hair transplant holes, where D is the thickness (mm) of the head portion. .)

[2] The toothbrush according to [1], wherein the stress generation parameter P ₁ is 2.3 to 4.0.

[3] The toothbrush according to [1] or [2], wherein at least one of the large-diameter hair transplant holes satisfies the condition that the uniaxial stress relaxation parameter P ₃ represented by the following formula ( ₃₎ is 2.0 to 5.5.

P ₃ =(S _D ×D)/d… Equation 3

(In Equation 3, however, S _D is the area (mm 2) of the hair transplantation surface surrounded by two tangent lines drawn in parallel with the short axis direction to the large-diameter hair transplant hole and the edges on both sides of the short axis direction of the head portion, It is a value obtained by subtracting the sum S _D2 of the opening area of the region i and the region i of all the hair transplant holes in the region i from the area S _D1 of the region i surrounded by the two tangent lines and the edges on both sides. It is the thickness (mm) of the head part, d is the width (mm) of the head part.)

[4] On the hair transplant surface, the large-diameter hair transplant hole and the small-diameter hair hair hole having a diameter of less than 1.8 mm are formed,

When a straight line parallel to the minor axis direction passing through the center of the large-diameter hair transplant hole is drawn for all the large-diameter hair transplant holes, a straight line of 50% or more with respect to the total number of the small-diameter hair transplant holes is The toothbrush according to any one of [1] to [3], which is a straight line that does not pass through the center of the hole.

In the toothbrush of the present invention, even if the head is thin, has excellent oral operability, and has a large-diameter hair bundle that has an effect such as improving the massage feeling, cracking or whitening in the head is suppressed, while The fixing power of the hair bundle is sufficiently secured.

1 is a front view showing an example of the toothbrush of the present invention.
2 is an enlarged front view of the head of the toothbrush of FIG. 1. Here, the hair bundle and the flat line are omitted.
3 is an AA cross-sectional view of the toothbrush of FIG. 2. Here, the hair bundle and the flat line are omitted.
4 is a front view explaining the stress generation parameter P ₁ and the major axis stress relaxation parameter P ₂ . Here, the hair bundle is omitted.
5 is a cross-sectional view illustrating the stress generation parameter P ₁ and the major axis stress relaxation parameter P ₂ , and is a cross-sectional view taken along BB in FIG. 4. Here, the hair bundle is omitted.
6 is a front view illustrating the stress generation parameter P ₁ and the major axis stress relaxation parameter P ₂ . Here, the hair bundle is omitted.
7 is a front view illustrating a uniaxial stress relaxation parameter P ₃ . Here, the hair bundle and the flat line are omitted.
8 is a cross-sectional view showing a state in which a hair bundle is planted in a hair transplant hole formed on a hair transplant surface.
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.
16 is a front view showing another example of the toothbrush of the present invention.

Hereinafter, an example of the toothbrush of the present invention will be shown and described in detail. In addition, dimensions and the like in the drawings exemplified in the following description are examples, and the present invention is not necessarily limited thereto, and it is possible to appropriately change and implement the subject matter without changing the scope.

The toothbrush 1 of this embodiment is provided with the handle body 1a made of resin, as shown in FIGS. The handle body 1a is formed of a head portion 10, a neck portion 12, and a handle portion 14.

The neck portion 12 is connected to the rear end side of the head portion 10 in the long axis direction. The neck portion 12 is a portion that connects the handle portion 14 and the head portion 10.

The handle portion 14 is connected to the rear end side of the neck portion 12 in the long axis direction. The handle part 14 is a part held by the user.

The handle body 1a may be one in which the head portion 10, the neck portion 12, and the handle portion 14 are integrally molded, or any of them may be separately molded and joined.

In the present invention, if the distance in the long axis direction of the front end of the hairdressing hole disposed on the most tip side and the tip of the head portion is L1 (Fig. 2), the rear end of the head portion is the outer edge of the hairdressing hole on the rearmost end. It is the position of the distance L1 from the rear end of the to the rear end in the major axis direction.

The head portion 10 has a hair transplant surface 10a on one side in the thickness direction.

A plurality of circular first hair transplant holes 11a and second hair transplant holes 11b are formed on the hair transplant surface 10a of the head portion 10. A hair transplanting part 18 is provided in the head part 10 of the toothbrush 1. In the hair transplant part 18, a first hair bundle 16a is planted in each of the plurality of first hair transplant holes 11a, and a second hair bundle 16b is provided in each of the plurality of second hair growth holes 11b. It has been planted.

In the toothbrush 1, as shown in Figs. 4 to 6 and 8, a plurality of hairs 15 are tied to each of the first hair transplant holes 11a and the second hair transplant holes 11b to make a half fold. One hair bundle 16a and a second hair bundle 16b are planted and provided by the type of the flat line 20. As described above, the toothbrush of the present invention is a toothbrush of flat wire hair.

The thickness D (FIG. 3) of the head portion 10 is 2 mm or more and 4 mm or less, preferably 2.5 mm or more and 3.5 mm or less. When the thickness of the head portion 10 is less than or equal to the upper limit of the above range, the toothbrush 1 has excellent intraoral operability, and a feeling of cleaning a small place in the oral cavity such as molar teeth is high. When the thickness of the head portion 10 is equal to or greater than the lower limit of the above range, cracking or whitening of the head portion can be suppressed, and hair bundle breaking strength can be secured.

In addition, the above-described range of the thickness D of the head portion means that the thickness is within the above range even when measured at any position of the head portion.

The width d (FIG. 2) of the head portion 10 is preferably 6 to 16 mm, more preferably 8 to 15 mm, and even more preferably 10 to 12 mm. If the width of the head portion 10 is equal to or greater than the lower limit of the above range, even if a plurality of large-diameter hair transplanting holes are arranged in the short axis direction, it is easy to sufficiently secure the pitch of the hair transplant holes, so that cracking and whitening of the head portion can be easily suppressed. In addition, it is possible to arrange the hair bundles suitable for cleaning the entire oral cavity utilizing the hair bundles of large diameter. If the width of the head portion 10 is less than or equal to the upper limit of the above range, it is difficult to impair intraoral operability, which is an advantage of the thin head portion.

In addition, the range of the width d of the head portion described above means that the maximum width of the head portion is within the above range. In addition, in this specification, the numerical range expressed by "to" means a numerical range including numerical values before and after to as a lower limit value and an upper limit value.

The length of the head portion 10 is preferably 10 to 33 mm, more preferably 12 to 28 mm. If the length of the head portion 10 is more than the lower limit of the above range, even if a plurality of large-diameter hair transplant holes are arranged in the long axis direction, it is easy to secure the distance between the holes, and it is easy to suppress cracking and whitening of the head portion. In addition, it is possible to arrange the hair bundles suitable for cleaning the entire oral cavity utilizing the hair bundles of large diameter. If the length of the head portion 10 is less than or equal to the upper limit of the above range, it is difficult to impair the operability in the oral cavity, which is an advantage of the thin head portion.

In the present invention, the plurality of hair transplanting holes formed on the hair transplanting surface of the head may be a single hair growth hole or a combination of hair growth holes having different diameters. In the case of combining hairdressing holes of different diameters, it is preferable to make the diameter of the hairdressing holes arranged in the long-axis direction uniform from the viewpoint of maintaining a constant touch feeling of the hair bundle when brushing the toothbrush in the long-axis direction. In addition, from the viewpoint of easy to obtain a sense of massage for the gums, it is preferable to arrange a hair transplant hole having a larger diameter in which the brushing pressure is easily dispersed, outside in the short axis direction. In addition, in order to further enhance the cleaning feeling of the molar using the thin head portion and to be compatible with the massage feeling, it is preferable to arrange a hair bundle with a small diameter responsible for the cleaning effect inside in the short axis direction. In addition, the minor axis direction is a direction parallel to the hair transplant surface and orthogonal to the major axis direction.

The arrangement pattern of the hair transplant holes is not particularly limited, and a zigzag shape and a lattice shape can be illustrated.

In the toothbrush head portion of the present invention, each hairstyling hole is formed so that two or more hairstyling holes having a diameter of 1.8 mm or more are arranged in the long axis direction of the handle body.

In addition, "the hair transplantation holes are arranged in the long axis direction" means that when two tangent lines parallel to the long axis direction are drawn so as to contact both sides of the short axis direction of an arbitrary hair transplant hole when viewed from the front of the head, between the two tangent lines. It means a state in which another hair transplant hole is formed so that at least a part of the area is overlapped. In the aspect in which the hair transplant holes are arranged in the long axis direction, not only the aspect in which the center of the other hair transplant holes is located on a straight line parallel to the long axis direction passing through the center of the arbitrary hair transplant hole, An aspect in which the center is located at a position deviated from a straight line parallel to the direction of the major axis passing through the center, and other hair transplant holes are formed side by side so as to partially overlap the region is also included.

Similarly, ``the hair transplant holes are arranged in the minor axis direction'' means that when two tangent lines parallel to the minor axis direction are drawn so as to be in contact with both sides of the long axis direction of an arbitrary hair transplant hole when viewed from the front of the head, between the two tangent lines. It means a state in which another hair transplant hole is formed so that at least a part of the area is overlapped.

In this example, as shown in Fig. 2, on each side of the short axis direction of the hair transplant surface 10a of the head portion 10, a first hair transplantation hole 11a having a diameter of 1.8 mm or more arranged in the long axis direction is formed. There are 5 pieces each. A total of 17 small-diameter second hair transplant holes 11b having a diameter of less than 1.8 mm arranged in three rows in the long-axis direction are formed in the central portion of the hair transplant surface 10a inside the first hair transplant hole 11a in the minor axis direction. . The small-diameter second hair transplant hole 11b is formed in a zigzag shape.

In the present invention, large-diameter hair transplanting holes having a diameter of 1.8 mm or more are arranged along the side edge of the head part in the long-axis direction outside of the short axis direction of the hair transplanting surface of the head, and the hair transplanting holes in the central part are arranged so as to be pinched between the hair transplanting holes of the large diameter It is desirable to do. In the toothbrush 1, the small-diameter second hair-piling holes 11b at the center are pinched by two rows of large-diameter first hair transplant holes 11a formed along the side edge of the head portion 10 in the long axis direction. Thereby, the feeling of massage of the gums at the time of cleaning can be made higher.

In the present invention, the small-diameter hairdressing holes in the central portion may be sandwiched between a pair of large-diameter hairdressing holes in one row, or between two pairs of large-diameter hairdressing holes.

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

In the toothbrush 1, the large-diameter first hairdressing holes 11a and the small-diameter second hairdressing holes 11b arranged in the short axis direction of the head part 10 are the center and the first hairdressing hole 11a. 2 The center of the hair transplant hole 11b is formed so that it may not exist on the same straight line parallel to the short axis direction.

In the present invention, in the case of forming a large-diameter hair transplantation hole and a small-diameter hair transplantation hole on the hair transplantation surface of the head, as in this example, the center of the large-diameter hair transplantation hole and the small-diameter hair growth hole center are on the same straight line parallel to the short axis direction. It is desirable not to exist in. That is, even when the large-diameter hair transplant holes and the small-diameter hair transplant holes are arranged in the short axis direction, it is preferable to form such that the centers of the large-diameter hair transplant holes and the small-diameter hair transplant holes are shifted in the short axis direction. Thereby, even if a plurality of large-diameter hair transplant holes and small-diameter hair transplant holes are formed in the short axis direction, since it is easy to sufficiently secure the pitch of the hair transplant holes, it becomes difficult to cause cracking in the head portion.

In the case where two or more large-diameter hair transplant holes are formed in the short axis direction of the head, it is preferable that the center of each hair transplant hole does not exist on the same straight line parallel to the short axis direction, even between those large-diameter hair transplant holes. In the case where two or more small-diameter hair transplant holes are formed in the short axis direction of the head, it is preferable that the center of each hair transplant hole does not exist on the same straight line parallel to the short axis direction, even between these small-diameter hair transplant holes.

In the present invention, it is particularly preferable that all the hair transplant holes arranged in the short axis direction of the head portion are formed to be shifted from each other so that the center of the other hair transplant holes does not exist on a straight line passing through the center of the arbitrary hair transplant hole.

The diameter of the large-diameter first hair transplant hole 11a of 1.8 mm or more in diameter is preferably 1.8 to 3.2 mm, more preferably 2.0 to 2.5 mm. When the diameter of the 1st hair transplant hole 11a is more than the lower limit of the said range, the feeling of massage of the gum is improved. If the diameter of the first hair transplant hole 11a is less than or equal to the upper limit of the above range, when the hair bundle is planted and provided, it is possible to suppress the thickening of the folded portion of the hair bundle under the flat line. Since it becomes possible, it is easy to ensure the strength of pulling out hair bundles and the strength of pulling out one hair, and it is easy to suppress cracking and whitening of the head.

It is preferable that the diameters of the large-diameter hairdressing holes arranged in the long axis direction are the same.

The diameter of the small-diameter second hair transplant hole 11b having a diameter of less than 1.8 mm is preferably 1.0 to 1.7 mm, more preferably 1.2 to 1.5 mm. When the diameter of the second hair transplant hole 11b is equal to or greater than the lower limit of the above range, the rigidity of the hair bundle required for cleaning the jig can be secured. If the diameter of the second hair transplant hole 11b is less than or equal to the upper limit of the above range, it is possible to ensure adequate bending of the hair bundle necessary for cleaning the jig.

It is preferable that the diameter of the small-diameter hair transplant holes arranged in the long axis direction is the same.

In addition, the diameter of the hair transplant hole is the diameter when the shape of the hair transplant hole viewed from the front is circular, and when the shape of the hair transplant hole viewed from the front is not circular, it is the diameter of the circumscribed circle of the said hair transplant hole viewed from the front.

In the present invention, the ratio of the total number of hair transplanting holes having a diameter of 1.8 mm or more to the total number of hair transplanting holes provided on the hair transplant surface (hereinafter, also referred to as "ratio Q ₁ ") is 10% or more. In the toothbrush 1 of this embodiment, the ratio Q ₁ is 34%. By setting the ratio Q ₁ to 10% or more, the feeling of massage of the gums is enhanced. The upper limit of the ratio Q ₁ is 100%.

The lower limit of the ratio Q ₁ is 10% or more, preferably 20% or more, and more preferably 30% or more. The upper limit of the ratio Q ₁ is 100%, preferably 80% or less, more preferably 50% or less, and even more preferably 40% or less. The ratio Q ₁ is preferably 10 to 80%, more preferably 20 to 50%, and still more preferably 30 to 40%. Thereby, it is possible to achieve both a feeling of massage of the gum and cleaning of the jig.

In the present invention, it is preferable that the ratio of the total number of hair transplanting holes with a diameter of 2.0 mm or more to the total number of hair transplanting holes provided on the hair transplant surface is 10% or more, and that the ratio of the total number of hair growth holes having a diameter of 2.0 mm or more is 20% or more. It is more preferable, and it is still more preferable that the ratio of the total number of hair growth holes of 2.0 mm or more in diameter is 30% or more. Thereby, it is easy to obtain a sense of massage of the gums.

In the toothbrush of the present invention, at least one set of large-diameter hair transplant holes adjacent to the long axis direction is the ratio of the stress generation parameter P ₁ expressed by the following equation 1 to the long axis stress relaxation parameter P ₂ expressed by the following equation 2 (hereinafter , "Ratio Q ₂ " is also described as 20 to 30% (hereinafter, also referred to as "condition I") is satisfied.

P ₁ =(S _A -S _B )×h… Equation 1

P ₂ =S _C ×D… Equation 2

However, in Formulas 1 and 2, S _A is an area (mm 2) of a circumscribed circle of a flat line typed into a large-diameter hair transplant hole when viewed from the front. S _B is the opening area (mm 2) of a large-diameter hair transplant hole. h is the distance (mm) from the hair transplant surface to the lower end of the flat line typed into the large diameter hair transplant hole when viewed from the side. S _C is the area (mm 2) of the hair transplantation surface surrounded by two tangent lines that are in contact with each of the opening edges of the large-diameter hairdressing holes adjacent to the major-diameter hairdressing holes and adjacent large-diameter hairdressing holes, and do not intersect. . D is the thickness (mm) of the head part.

When the diameters of large-diameter hair transplanting holes adjacent to each other in the major axis direction are different, values relating to the hair growth holes and flat lines of the larger diameter are respectively used for S _A , S _B and h used to calculate the stress generation parameter P ₁ . do.

When the thickness of the head changes in the major axis direction, the thickness D used for calculating the major axis stress relaxation parameter P ₂ is the thickness of the head at the midpoint between the centers of the large-diameter hairdressing holes adjacent to each other in the major axis direction. do.

In the toothbrush 1 of this example, in the first hairdressing holes 11a of two large diameters adjacent to each other on a straight line parallel to the long axis direction in the head portion 10, for example, in FIG. 4 As shown, when viewed from the front of the head portion 10, the area (mm 2) of the circumscribed circle of the flat wire 20 that is typed in the large-diameter first hair transplant hole 11a is referred to as S _A. The opening area of the large-diameter first hair transplant hole 11a is referred to as S _B. Two tangent lines (k1, k2) that are in contact with and do not intersect with each of the opening edges of the large-diameter first hairdressing holes 11a adjacent to the long axis direction and the adjacent large-diameter first hairdressing holes 11a. The area (mm2) of the hair transplant surface 10a surrounded by is _denoted by S _c . As shown in Fig. 5, when viewed from the side of the head portion 10, the distance (mm) from the hair transplant surface 10a to the lower end of the flat line 20 typed in the large-diameter first hair transplant hole 11a is h It is called.

In the portion near the front end or the rear end of the head portion 10, two large-diameter first hairdressing holes 11a adjacent side by side in the long axis direction while the centers of each other are not arranged on a straight line parallel to the long axis direction. ), S _A , S _B , and h are the same as in the above case. In addition, as shown in Fig. 6, each of the opening edges of the large-diameter first hairdressing holes 11a adjacent to the long axis direction and the adjacent large-diameter first hairdressing holes 11a are in contact with each other, and intersect. The area (mm2) of the hair transplantation surface 10a surrounded by two tangent lines (k3, k4) that is not applied is referred to as S _c .

In the present invention, of all combinations of large-diameter hair transplanting holes adjacent to the long axis direction, at least one set satisfies the condition I. All combinations of large-diameter hair transplanting holes adjacent to each other in the long axis direction may satisfy condition I, or combinations that satisfy condition I and combinations that do not satisfy condition I may be mixed.

The ratio of the number of combinations of adjacent large-diameter hair transplanting holes to satisfy the condition I to the total number of all combinations of large-diameter hair transplanting holes adjacent in the long axis direction is preferably 30% or more, and more 50% or more. It is preferable, and 80% or more is more preferable. If the ratio is equal to or greater than the lower limit, even under the condition of a thin head using large-diameter hair transplanting holes, it is easy to obtain an effect of suppressing cracking of the head portion while maintaining the hair removal strength and the hair removal strength.

The ratio Q ₂ (=(P ₁ /P ₂ )×100) is 20 to 30%, preferably 22 to 30%, more preferably 25 to 30%, and still more preferably 25 to 27%. When the ratio Q ₂ is within the range of the above range, even under the condition of a thin head using a large-diameter hair growth hole, it is possible to suppress the cracking of the head portion while maintaining the hair removal strength and the hair removal strength. In general, toothbrushes tend to cause cracking in the long axis direction during hair transplantation, but if the ratio Q ₂ is within the above range, even under the condition of a thin head using a large diameter hair growth hole, cracking in the long axis direction is sufficiently suppressed. can do.

The stress generation parameter P ₁ is preferably 2.3 to 4.0, more preferably 2.4 to 3.7. When the stress generation parameter P ₁ is equal to or greater than the lower limit of the above range, the strip of the flat line becomes sufficiently large, and sufficient hair flocking strength and hair dropping strength are easily secured. When the stress generation parameter P ₁ is less than or equal to the upper limit of the above range, it is possible to suppress the protrusion of the flat line from becoming too long or the impact of the type being too large, and it is easy to suppress the occurrence of cracking in the direction of the major axis of the head even in thin thickness.

As for the major axis stress relaxation parameter P ₂ , 6-17 are preferable, 6-14 are more preferable, and 7-11 are still more preferable. If the major axis stress relaxation parameter P ₂ is equal to or greater than the lower limit of the above range, the impact at the time of type of a flat wire is easily alleviated, and cracking or whitening in the head portion is suppressed even if it is thin. When the long axis stress relaxation parameter P ₂ is less than or equal to the upper limit of the above range, the spacing between the hair transplant holes does not become too wide, so that a feeling of consumption is difficult to occur, and a sufficient cleaning power and a feeling of massage are easily obtained.

As for h, 1.1 to 1.8 mm are preferable, and 1.3 to 1.7 mm are more preferable. It is preferable that h is equal to the value obtained by subtracting the radius of the hair transplant hole from the depth of the hair transplant hole.

In the toothbrush of the present invention, at least one of the large-diameter hair transplant holes satisfies the condition that the uniaxial stress relaxation parameter P ₃ represented by the following formula ( ₃₎ is 2.0 to 5.5 (hereinafter, also referred to as “condition II”). It is desirable to do it.

P ₃ =(S _D ×D)/d… Equation 3

However, in Equation 3, S _D is the area (mm 2) of two tangent lines drawn in parallel with the minor axis direction to the large-diameter hair transplant hole and the area (mm 2) of the planting surface surrounded by edges on both sides of the minor axis direction of the head, and the two tangent lines And the area S _D1 of the area i surrounded by the borders on both sides of the area i, subtracting the sum S _D2 of the opening areas of all the hairdressing holes in the area i overlapping the area i. D is the thickness of the head portion. d is the width of the head portion.

When the width of the head portion changes in the major axis direction, d is the distance between the edges of the head portion in the minor axis direction on a straight line in the minor axis direction passing through the center of the hair growth hole in which P _{3 is} to be calculated when viewed from the front.

In this example, as shown in FIG. 7, two tangent lines m1 and m2 drawn parallel to the minor axis direction in the large-diameter first hair transplant hole 11a, and the edges on both sides of the minor axis direction of the head portion 10 The area (mm 2) of the hair transplant surface 10a surrounded by (10b, 10c) is referred to as S _D.

S _D can be calculated as follows. When viewed from the front of the head portion 10, two tangent lines m1 and m2 drawn parallel to the minor axis direction so as to be in contact with both sides of the large-diameter first hair transplant hole 11a in the long axis direction, and the head portion 10 The area (mm 2) of the area i surrounded by the edges 10b and 10c on both sides in the short axis direction is referred to as S _D1 . The sum (mm 2) of the opening areas of all the first hair transplant holes 11a and the second hair transplant holes 11b in the region i is referred to as S _D2 . For the hair transplant holes in which only a part of the first hair transplant holes 11a and the second hair transplant holes 11b are in the region i, S _D2 is calculated only for the area of the opening area of the opening end of the hair transplant hole overlapping the region i. Used for S _D is calculated by subtracting S _D2 from S _D1 .

In the present invention, at least one of the large-diameter hair transplant holes satisfies the condition II. All of the large-diameter hair transplantation holes may satisfy the condition II, or a large-diameter hair transplantation hole that satisfies the condition II and the large-diameter hair transplantation hole that does not satisfy the condition II may be mixed.

The ratio of the total number of S _D patterns satisfying condition II to the total number of S _D patterns that can be taken is preferably 30% or more, more preferably 50% or more, and even more preferably 80% or more. . When the ratio is equal to or greater than the lower limit, it becomes easy to obtain sufficient cleaning power and a massage feeling while suppressing cracking in the short axis direction.

In addition, when viewed from the front, when the center of the hair transplant hole is on the same straight line parallel to the minor axis direction, and there are two or more large-diameter hair transplant holes in which the region i at the time of calculating S _D is the same, ``can be taken S _D when the total number of pattern cells "in which, by integrating for the flocking holes of their large diameter to be the count of one of the S _D pattern.

The uniaxial stress relaxation parameter P ₃ is preferably 2.0 to 5.5, more preferably 3.0 to 5.0, and still more preferably 3.5 to 4.5. In general, when brushing with a toothbrush, since the head is bent in the long axis direction, cracking tends to occur in the minor axis direction, but if the uniaxial stress relaxation parameter P ₃ is more than the lower limit of the above range, cracking in the minor axis direction is sufficiently suppressed. easy. When the uniaxial stress relaxation parameter P ₃ is less than or equal to the upper limit of the above range, the spacing between the hair transplant holes does not become too wide, so that a feeling of consumption is difficult to occur, and a sufficient cleaning power and a feeling of massage are easily obtained.

In the toothbrush 1 of this example, when a straight line parallel to the short axis direction passing through the center of the first hair transplant hole 11a of the large diameter when viewed from the front is drawn for all the first hair transplant holes 11a of the large diameter, they A straight line of 50% or more with respect to the total number of straight lines is a straight line that does not pass through the center of the small-diameter second hair transplant hole 11b. In the present invention, when forming a large-diameter hair transplantation hole and a small-diameter hair transplantation hole on the hair transplant surface of the head, as in this example, all the large-diameter hair transplantation holes are viewed from the front, passing through the center of the large-diameter hair transplantation hole. When a straight line parallel to the minor axis direction is drawn, a straight line of 50% or more with respect to the total number of these straight lines is preferably a straight line that does not pass through the center of the small-diameter hair transplant hole.

In addition, the term "not passing through the center of the small-diameter hairdressing hole" means the diameter of the large-diameter hairdressing hole in the direction of the long axis of the toothbrush, centering on a straight line parallel to the minor axis direction passing through the center of the large-diameter hairdressing hole. It means that the center of the small-diameter hair transplant hole does not exist in the area|region formed when it moves in parallel with the width of 20%.

In addition, when viewed from the front, when the centers of two or more large-diameter hairdressing holes are on the same straight line parallel to the short axis direction, the straight line parallel to the short-axis direction passing through the center of the large-diameter hairdressing holes coincides. When counting the total number of straight lines, count as one.

In addition, in the measurement of the total number of S _D patterns that can be taken and the total number of straight lines, "on the same straight line" means a straight line parallel to the short axis direction passing through the center of the large-diameter hairdressing hole. It means that the center of another large-diameter hair transplantation hole exists in a region formed when equally moving in parallel with a width of 20% of the diameter of the large-diameter hair transplant hole in the long axis direction of the toothbrush as the center.

When a large-diameter hair transplant hole is provided, the head portion becomes more liable to be split in the short axis direction compared to a case where a small-diameter hair hair hole is provided. In addition, when a large-diameter hair transplant hole and a small-diameter hair transplant hole are combined, the number of holes tends to increase as compared to the case of only large-diameter hair transplant holes, and the stress applied to the large-diameter hair transplant hole and the small-diameter adjacent to the short axis direction Since there is a difference in the stress applied to the hair transplant hole, deformation tends to occur. Therefore, when a large-diameter hair transplant hole and a small-diameter hair transplant hole are combined, the head part tends to become more easily cracked. On the other hand, by forming the large-diameter hairdressing hole and the small-diameter hairdressing hole to be shifted in the short axis direction so that a straight line of 50% or more relative to the total number of the straight line does not pass through the center of the small-diameter hairdressing hole. It becomes easy to suppress the crack in the minor axis direction. The ratio is more preferably 70% or more, and still more preferably 90% or more.

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

As the material of the handle body 1a, a resin having a flexural modulus (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 still more preferably 2000 MPa or more and 2700 MPa or less. When the bending elastic modulus of the resin is more than the above lower limit, the bending of the head portion 10 is likely to be suppressed. When the bending elastic modulus of the resin is less than or equal to the above upper limit, the neck portion 12 at the time of crushing is appropriately bent, thereby improving the feeling of massage of the gums. In addition, it is possible to increase the followability of the ends of the hair to the teeth, so that it is possible to efficiently brush teeth.

Preferred resins used as the material of the handle 1a include polypropylene (PP), polyacetal (POM), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), and polycyclohexylenedimethylene terephthalate. (PCT) can be illustrated, and POM is particularly preferable from the viewpoint of resin strength.

The number of resins used as the material of the handle body 1a may be one or two or more.

The handle body may be partially or entirely covered with a flexible resin such as an elastomer in order to improve the gripping property. As the above-described flexible resin, an olefin elastomer is preferable if the material of the handle body is PP, and a styrene elastomer is preferable if the material of the handle body is PP.

The material of the hair is not particularly limited, and polyamide (6-12 nylon, 6-10 nylon, 12-nylon, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, etc.), polyolefin Synthetic resin materials and natural materials such as (polypropylene, etc.) and elastomers (olefin-based, styrene-based, etc.) can be illustrated. The material of the feature 15 may be one, or two or more.

The cross-sectional shape of the feature is often circular, but is not limited to a circular shape, and may be a triangle, a square, a hexagon, a petal shape, or the like, or a shape in which these are combined. The external shape of the entire feature is also not particularly limited, and one processed into a web shape, a twist shape, a jagged serrated shape, or the like may be used.

The diameter of the hair is preferably 3 to 12 mil (0.076 to 0.305 mm), and more preferably 5 to 10 mil (0.127 to 0.254 mm). It is preferable to plant and provide hairs with a small hair diameter in the large-diameter hair transplant holes. Thereby, even if it is a thick hair bundle, it becomes possible to bend the hair bundle at the time of cleaning, and a toothbrush with a high sense of massage of the gums can be provided.

In addition, the diameter of the feature is the diameter when the cross-sectional shape of the feature is circular, and when the cross-sectional shape of the feature is not circular, it is the diameter of the circumscribed circle of the cross section of the feature.

The features may be usually gathered with substantially the same diameter within one feature except for the rounding of the hair end. In addition, in the vicinity of the hair transplantation surface 10a of the head portion 10, the thickness is the above, and it may be a sharpened tapered so that the diameter gradually decreases toward the hair end. In this case, since the penetration of the hair tip into the gap between the teeth is good, and a soft touch feeling can be realized, it is suitable for cleaning of the cervical area or massaging the gums. In addition, normal hair and tapered hair can be appropriately selected for each hair transplant hole, mixed hair within the same hair bundle, or freely combined.

The length (hair length) of the hair from the hair transplant surface 10a can be appropriately set, and is, for example, about 6 to 15 mm. The hair length of the hair is preferably within the range of 9 mm to 15 mm for adults and 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 and second hair transplant holes 11a and 11b to be planted.

As described above, in the toothbrush of the present invention, since the thickness of the head portion is 2 mm or more and 4 mm or less, the operability in the oral cavity is excellent, and the feeling of cleaning molar teeth and the like is high. In addition, since the ratio Q ₁ of the hair growth holes having a diameter of 1.8 mm or more is 10% or more, various effects can be obtained due to hair bundles having a large diameter, such as increasing the sense of massage of the gums.

Further, in the case where large-diameter hair transplanting holes having a large impact imparted to the head portion during planting are arranged and formed in the long-axis direction with respect to the thin-walled head portion, cracking or whitening is particularly likely to occur. In contrast, in the toothbrush of the present invention, two or more large-diameter hair transplanting holes are arranged in the long axis direction while controlling the ratio Q ₂ of the stress generation parameter P _{1 to} the long axis stress relaxation parameter P ₂ within a specific range. Therefore, while suppressing the occurrence of cracking and whitening of the head portion, sufficient fixing force of the hair bundle by the flat line can be ensured, and high flocking strength and hair dropping strength can be obtained.

In addition, 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 number of hair bundles planted on the hair transplant surface of the head portion and the arrangement pattern of the hair transplant holes are not limited to those of the toothbrush 1. Specifically, the number of hair bundles in the toothbrush of the present invention and the arrangement pattern of the hair growth holes may be the same as those of the toothbrushes 1A to 1G illustrated in FIGS. 9 to 15.

In the toothbrush of the present invention, as shown in Fig. 16, a small-diameter second hair transplantation hole 11b is disposed outside in the minor axis direction, and a large-diameter first hair transplantation hole 11a is disposed inside the short axis direction. (1H) may be sufficient.

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 of molar teeth]

A sensory test was performed by 10 expert panelists, and the ease of cleaning of the molar tooth (second molar tooth) was evaluated based on the following criteria. The average score of 10 expert panelists is 4.0 or more and 5.0 or less as ``◎'', 3.0 or more and less than 4.0 as ``○'', 2.0 or more, and less than 3.0 as ``△'', and less than 2.0 as ``x'' I did. It was judged that the value of ○ or ◎ was a toothbrush with high ease of cleaning the molars.

(Evaluation standard)

5 points: very easy to clean.

4 points: It is slightly easy to clean.

3 points: neither.

2 points: It is slightly difficult to wipe.

1 point: Very difficult to clean.

[The feeling of dropping the jig]

A sensory test by 10 expert panels was performed, and the feeling of dropping the jig was evaluated based on the following criteria. The average score of 10 expert panelists is 4.0 or more and 5.0 or less as ``◎'', 3.0 or more and less than 4.0 as ``○'', 2.0 or more, and less than 3.0 as ``△'', and less than 2.0 as ``x'' I did. It was judged that the value of ○ or ◎ was a toothbrush with high feeling of dropping the jig.

(Evaluation standard)

5 points: I feel very much.

4 points: I feel a little.

3 points: neither.

2 points: I don't feel it very much.

1 point: No feeling at all.

[Evaluation of the feeling of massage of the gums]

A sensory test by 10 expert panels was conducted, and the feeling of massage of the gums was evaluated based on the following criteria. The average score of 10 expert panelists is 4.0 or more and 5.0 or less as ``◎'', 3.0 or more and less than 4.0 as ``○'', 2.0 or more, and less than 3.0 as ``△'', and less than 2.0 as ``x'' I did. The value of ○ or ◎ was judged to be a toothbrush with a high sense of massage of the gum.

(Evaluation standard)

5 points: I feel very much.

4 points: I feel a little.

3 points: neither.

2 points: I don't feel it very much.

1 point: No feeling at all.

[Evaluation of cracking and whitening of the head]

Using a hair transplanter made by Zahoranski, 100 toothbrushes are made on the head, and the number of cracks and white flowers occurring on the head is detected with the eyes of a professional inspector, and the number of hair for 100 toothbrushes is The value (percentage) divided by the number of holes was used as an evaluation criterion for cracking and whitening. The cracking and whitening of the head part were evaluated according to the following criteria.

(Evaluation standard)

◎: 0%.

○: greater than 0% and less than 0.1%.

?: 0.1% or more and less than 0.5%.

×: 0.5% or more.

[Difficulty falling out of hair bundles]

A hair bundle planted in one large-diameter hairdressing hole is held by a dedicated instrument, and the maximum tensile stress (N) until the hair bundle is removed from the hairdressing hole is measured using a tensile tester (tensile speed 20mm/min) (n =10), and the difficulty of falling out of the hair bundle was evaluated according to the value according to the following criteria.

(Evaluation standard)

(Double-circle): The average value of the maximum tensile stress is 25N or more.

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

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

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

[Example 1]

POM (bending modulus: 2500 MPa) was used as a resin for forming the handle body, and according to the specifications shown in Tables 1 and 2, handle bodies 1a illustrated in Figs. 1 to 8 were produced by injection molding. Toray Monofilament's hair bundles (diameter: large hole 5.0 mil, small hole 6.0 mil) are folded in half, and the flat line inserted between them is typed into the hair transplant hole in the head according to the specifications shown in Table 2. Thus, a toothbrush was manufactured by planting and preparing a bundle of hair.

[Examples 2 to 4, Comparative Examples 1 to 4]

A toothbrush was produced in the same manner as in Example 1, except that the specification of the hair transplant hole and the flat wire was changed as shown in Tables 1 and 2.

The specifications of the toothbrush of each example are shown in Tables 1 and 2, and the evaluation results are shown in Table 3. In addition, the specifications of the hair transplantation hole and the flat wire in Examples 1, 2 and 4 of Table 2 and Comparative Examples 1 and 2 were shown only for the large diameter hair transplantation hole. Further, in Comparative Example 3, P _1, P ₂ and Q ₂ is 4 in Table 2, it is shown the values calculated for flocking holes of small diameter, instead of the large-diameter hole implanted.

As shown in Tables 1 to 3, the toothbrushes of Examples 1 to 4 in which the thickness of the head portion, the ratio Q ₁ and the ratio Q ₂ were controlled within the ranges specified in the present invention, cracking and whitening of the head portion were suppressed, Sufficient hair growth was ensured. In addition, the molar teeth were easy to clean, the feeling of dropping the jig was high, and the feeling of massaging the gums was high.

In Comparative Examples 3 and 4 in which the ratio Q ₂ was high and the stress generation parameter P ₁ was low, the risk of cracking and whitening of the head portion increased, and the hair bundle breaking strength tended to decrease. In addition, in the toothbrushes of Comparative Examples 3 and 4 having no hair growth holes having a diameter of 1.8 mm or more, the massage feeling to the gums was insufficient compared to the examples. In Comparative Examples 1 and 2 where the thickness of the head portion was too thick, the molar teeth were difficult to clean compared to the examples.

1: toothbrush
1a: handle body
10: head
10a: hair growth
10b, 10c: border
11a: first hair transplant hole
11b: second hair transplant hole
12: neck
14: handle part
16a: first hair bundle
16b: second hair bundle
18: mother-in-law
20: Pyeongseon

Claims (4)

A toothbrush comprising a resin handle body including a head portion provided with a plurality of hair transplantation holes on a hair transplant surface, and a hair growth portion provided by planting hair bundles in each of the hair growth holes by a type of flat line,
The thickness of the head is 2 mm or more and 4 mm or less,
The ratio of the total number of large-diameter hair transplant holes with a diameter of 1.8 mm or more with respect to the total number of hair transplant holes provided on the hair transplant surface is 10% or more,
Two or more large-diameter hair transplant holes are arranged in the long axis direction of the handle body,
It is said that at least one set of the large-diameter hair transplantation holes adjacent to the major axis direction has a ratio of 20 to 30% of the stress generation parameter P ₁ represented by the following equation 1 to the major axis stress relaxation parameter P ₂ represented by the following equation 2 A toothbrush that meets the conditions.
P ₁ =(S _A -S _B )×h… Equation 1
P ₂ =S _C ×D… Equation 2
(However, in the formulas 1 and 2, S _A is the area (mm 2) of the circumscribed circle of the flat line, which is typed into the large-diameter hair transplant hole when viewed from the front. S _B is the opening area of the large-diameter hair transplant hole. H is the distance (mm) from the hair transplant surface to the lower end of the flat line that is typed into the large-diameter hair transplant hole when viewed from the side, S _C is the large-diameter hair transplant hole adjacent to the major axis direction. It is the area (mm 2) of each of the opening rims of, and the hair transplantation surface surrounded by two tangent lines that do not intersect with any of the adjacent large-diameter hair transplant holes, where D is the thickness (mm) of the head portion. .) The toothbrush according to claim 1, wherein the stress generation parameter P ₁ is 2.3 to 4.0. The toothbrush according to claim 1 or 2, wherein at least one of the large-diameter hair transplant holes satisfies the condition that the uniaxial stress relaxation parameter P ₃ represented by the following formula ( ₃₎ is 2.0 to 5.5.
P ₃ =(S _D ×D)/d… Equation 3
(In Equation 3, however, S _D is the area (mm 2) of the hair transplantation surface surrounded by two tangent lines drawn in parallel with the short axis direction to the large-diameter hair transplant hole and the edges on both sides of the short axis direction of the head portion, It is a value obtained by subtracting the sum S _D2 of the opening area of the region i and the region i of all the hair transplant holes in the region i from the area S _D1 of the region i surrounded by the two tangent lines and the edges on both sides. It is the thickness (mm) of the head part, d is the width (mm) of the head part.) The hair transplantation hole according to any one of claims 1 to 3, wherein the large-diameter hairdressing hole and the small-diameter hairdressing hole having a diameter of less than 1.8 mm are formed on the hair transplant surface,
When a straight line parallel to the minor axis direction passing through the center of the large-diameter hair transplant hole is drawn for all the large-diameter hair transplant holes, a straight line of 50% or more with respect to the total number of the small-diameter hair transplant holes is A toothbrush that is a straight line that does not pass through the center of the hole.

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