JP5915347B2 - toothbrush - Google Patents

Description

  The present invention relates to a toothbrush in which a flock hole is formed in a flock base of a head portion, and a hair bundle is implanted in the flock hole using a flat wire.

  This type of toothbrush has the impact and stress applied to the bottom of the flocked hole when the flock is deformed due to thermal shrinkage during cooling in the flocking table molding process or when a hair bundle is implanted using a flat wire. In order to prevent the flocking table from cracking, a certain degree of flocking table thickness is necessary (see Patent Document 1). For example, in the case of a toothbrush having a plurality of hair bundles, About 4.5 to 5 mm was required. However, when brushing, especially when brushing the buccal side, molar teeth and wisdom teeth, it is desirable that the flocking table has a thinner shape, and a toothbrush having a thinner flocking table has been desired.

  In addition, moisture and dentifrice may infiltrate inside the flock hole along the hair bundle, but once invaded, moisture etc. are difficult to dry, and depending on how it is managed, germs grow and hygiene is not good In addition, chemical attack may occur due to the remaining chemical components of the dentifrice. Therefore, when the flocking table is thinned, there is a possibility that cracking and deformation may occur due to the residual stress caused by fitting the flat wire together with the hair bundle into the flocking hole.

  On the other hand, the thing which made it easy to dry the hair | bristle bundle of the toothbrush after use by making a flock hole penetrate to the back | dorsal side is proposed (refer patent document 2). However, when the hair bundle is planted in the flock hole together with the flat line, the hair bundle cannot be pressed strongly with the flat line, and the support strength cannot be obtained. It is necessary to increase the depth, and the thickness of the flocking table is required to some extent. In addition, when a large force is applied during brushing, if the hair bundle protrudes to the back side of the flocking table, there is a risk of damaging the oral cavity.

  In addition, a toothbrush having air permeability has been proposed in which a small-diameter ventilation hole communicating with the back side is provided at the bottom of the flocking hole, and the hair bundle can be firmly pressed against the bottom when planting. (See Patent Documents 3 and 4). However, stress at the time of pressing a flat wire concentrates on such a bottom, and because the vent hole penetrates, sufficient durability strength cannot be obtained, and deformation and cracking due to residual stress occur. Similarly, there is a limit to reducing the thickness of the flocking table. In addition, there is a problem that moisture or the like tends to accumulate in the corners of the bottom around the vent hole, and it cannot be sufficiently dried. Furthermore, since these holes are provided with a hole exclusively for ventilation in addition to the flocking hole, the depth of the ventilation hole is added separately from the depth of the flocking hole for holding the hair bundle. The thickness tends to increase.

Japanese Patent No. 2896084 Utility Model Registration No. 3087094 No. 7-55938 Japanese Patent Laid-Open No. 10-42953

  In view of the circumstances as described above, the object of the present invention is to hold the hair bundle firmly by pressing strongly with a flat wire, prevent deformation and cracking of the flocking table due to stress at that time, Providing easy-to-use toothbrushes that are easy to reach the teeth in the back of the oral cavity by making the flocking table thin, making it difficult to collect even if it enters, etc. There is.

  As a result of intensive studies to solve such problems, the inventor has a structure in which the flock holes are penetrated from the flocked base to the dorsal side, and the inner peripheral surface of the follicle is reduced in diameter as soon as it hits the bottom of the hair bundle. It has been found that by providing a stop surface to be used, it is possible to provide a toothbrush with a small flocking table, and the present invention has been completed.

That is, the gist of the present invention is as follows.
[1] A toothbrush having a flock hole in a flocking table, and a bunch of hair bundles obtained by bundling a plurality of filaments into the flock hole and being folded in two, using a flat wire, From the stop surface which is provided penetrating from the abdominal side to the back side, and the inner hole area becomes smaller as it hits the curved bottom side part of the hair bundle in the middle in the depth direction of the inner peripheral surface A toothbrush characterized by having a protrusion,
[2] The area (S) of the opening on the ventral side of the flocked hole, and the hole area (s1) at the top where the hole area inside the retaining surface of the protrusion on the inner peripheral surface of the flocked hole is the smallest The ratio of 0.35 ≦ s1 / S ≦ 0.65, the toothbrush according to [1],
[3] The toothbrush according to [1] or [2], wherein the contact surface is a tapered surface or an outwardly convex curved surface,
[4] The above [1] to [1] having an enlarged surface that gradually expands from the top where the hole area inside the contact surface of the protrusion on the inner peripheral surface of the flocked hole becomes the smallest to the opening on the back side. 3] The toothbrush according to any one of
[5] The ratio of the inner hole area (s1) at the top of the inner peripheral surface of the flocked hole to the inner hole area (s2) of the opening on the back side of the flocked hole is 1 <s2 / s1 ≦ 2. Toothbrush as described in said [4],
[6] The toothbrush according to any one of [1] to [5], wherein the flocking hole has a taper or an R surface at an edge of the flocking base back side opening.
It is.

  According to the present invention, by forming a through hole, it is possible to promote drying of invading moisture and the like, and to solve the problems of hygiene and chemical attack. By providing a projecting part consisting of a retaining surface that reduces the size of the retaining surface, the inner hole area gradually becomes smaller according to the depth while the hair bundle is firmly held by the projecting part with a flat wire. Since the contact area is secured along the bottom side of the hair bundle, the stress is dispersed and stress concentration is avoided, the flocking table is prevented from being deformed or cracked, and the contact surface has no gap with the filament. Because it comes into contact, even if moisture or the like enters, it does not collect easily, and it can be dried from the penetrating back side. Therefore, the flocking table can be thinned even though it is a toothbrush in which a bunch of hair was planted using a flat wire, which conventionally required a thicker flocking table.

  Here, the area (S) of the opening on the ventral side of the flocked hole and the hole area (s1) at the top where the hole area inside the retaining surface of the protrusion on the inner peripheral surface of the flocked hole is the smallest. If the ratio is set to be 0.35 ≦ s1 / S ≦ 0.65, even if the flocking table is thinned, the hair bundle can be abutted against the abutment surface to ensure sufficient support strength, The opening area on the back side can be secured, and the invaded moisture can be dried without delay.

  Further, if the abutment surface is a tapered surface or an outwardly convex curved surface, the contact area with the bottom side portion of the hair bundle on the abutment surface becomes larger, and the above-described stress dispersion effect can be further enhanced. Even if moisture or the like invades, there is almost no gap between the hair bundle and moisture or the like is not accumulated.

  Furthermore, by providing an enlarged surface that gradually expands from the top where the hole area inside the retaining surface of the protrusion on the inner peripheral surface of the flocked hole is the smallest to the opening on the back side, It is possible to dry the moisture invading from the hair without any delay, and to dry the hair bundle after use more efficiently. In addition, the mating surface of the mold can be positioned at the top of the flocking hole, and it is possible to prevent the burr from occurring at the edge of the opening on the back side and causing discomfort in the oral cavity.

  Here, the ratio of the inner hole area (s1) at the top of the inner peripheral surface of the flocked hole to the inner hole area (s2) of the opening on the back side of the flocked hole is set to 1 <s2 / s1 ≦ 2. It is necessary to dry the hair bundle after use, and to remove the mold at the time of molding the flocking table, and for the brushing to protrude from the back of the flocking table and hit the oral cavity, causing discomfort. From the viewpoint of avoidance, it is preferable. When the value of s2 / s1 is larger than 2, there is a possibility that the hair bundle hits the oral cavity through the opening on the back side during brushing and gives discomfort.

  In addition, by providing a taper or R surface at the edge of the back opening of the flocking table, it is possible to eliminate irritation in the oral cavity due to contact with the edge of the back opening, and it is sufficient after use. Even if the toothbrush is not drained, the surface tension such as moisture remaining in the opening portion on the dorsal side of the flocking hole can be reduced structurally, and the remaining amount can be reduced to improve the drying property.

(A) is the top view which looked at the toothbrush flocking table which has a some hair | bristle bundle in this invention from the back side, (b) is an external view of the single tuft toothbrush head part in this invention. The expanded sectional view of the principal part of a flocking table. It is sectional drawing about a flocking hole. (A) is a longitudinal cross-sectional view of a flocking hole, (b), (c) is a longitudinal cross-sectional view of a modification, (d), (e), (f) is an expanded sectional view which shows another modification. Explanatory drawing about each site | part dimension of a flocking hole. (A) is sectional drawing of the comparative example 1 in a through-hole finite element analysis test, (b) is sectional drawing of the comparative example 2 in a through-hole finite element analysis test, (c) is in a through-hole finite element analysis test. Sectional drawing of the comparative example 3, (d) is sectional drawing of Example 1 in a through-hole finite element analysis test. Results of drying test.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  In the toothbrush according to the present invention, a flock hole 12 is passed through the flock base 11 from the abdomen side to the back side, and a hair bundle is planted by a flat wire 13. The toothbrush in this case may be a toothbrush 1A having a plurality of bristle bundles as shown in FIG. 1 (a), or a so-called one having only one bristle bundle as shown in FIG. 1 (b). It may be a single tuft toothbrush 1B.

  As shown in FIG. 2, the flocking hole has a structure penetrating from the ventral side 25 to the dorsal side 26 of the flocking table, and a straight columnar structure is formed from the ventral side 25 to the middle part toward the dorsal side 26. doing. Here, the straight columnar structure may be a straight shape suitable for planting hair bundles. For example, a straight columnar structure may be mentioned, but even a straight elliptical columnar structure may be a straight square columnar structure. Of course, it is not limited to these. And the protrusion part 23 which has the contact surface 24 formed so that the inner hole area became small gradually according to the depth from the said middle part is formed. In such a flocking hole 12, by using the flat wire 13, the hair bundle 21 composed of a plurality of filaments 14 is folded in half and pushed from the flocking table belly side 25 toward the flocking table dorsal side 26, The bristle bundle 21 can be abutted against the abutment surface 24 that gradually reduces the inner hole area. The contact surface 24 is preferably composed of, for example, an annular surface such as a circle, an ellipse, or a square, depending on the shape of the cross section in the circumferential direction of the flock hole. What is necessary is just to have the surface for supporting the hair | bristle bundle 21 folded in half. As a result, the hair bundle 21 is firmly supported by a flat line while avoiding stress concentration by the contact surface 24, avoiding the risk of the hair bundle 21 protruding to the dorsal side 26 of the flocking table, and sufficient for the hair bundle 21 to be sufficient. High hair removal strength can be ensured.

  The inner peripheral surface extending from the top 41 of the protrusion 23 to the opening 29 on the back side 26 of the flocking table has a straight columnar structure as shown in FIG. 3A in this example, but as shown in FIG. A structure having an enlarged surface 27 that is enlarged toward the back side of the flocking table 26 or a structure having a reduced surface that is reduced toward the back side of the flocking table 26 as shown in FIG. From the viewpoint of speeding up drying, an enlarged structure as shown in FIG. 3B is more preferable.

  The abutment surface 24 of the protrusion 23 may be a tapered surface as shown in FIG. 3A, or may be an outwardly convex curved surface as shown in FIG. By doing so, it is possible to further increase the contact area between the bristles 21 and the flock holes 12 when the bristles 21 are stopped, and to reduce the residual moisture and dentifrice after using the toothbrush. Can do.

  Moreover, as shown to FIG.3 (e), (f), it is good also considering the edge part 28 of the back side opening part 29 of a flocking hole as R surface or C surface. By doing so, even if the toothbrush is not shaken well after use, the risk of moisture, dentifrice, etc. remaining in the opening 29 on the dorsal side 26 of the toothbrush base due to surface tension. Is reduced. Here, both the toothbrush having a plurality of bristle bundles and the single tuft toothbrush preferably have an R surface of, for example, R0.05 mm and a C surface of, for example, C0.05 mm, but are not limited thereto.

  Next, the dimension of each site | part in the flock hole 12 of this invention is demonstrated in detail using FIG.

  Here, the area S inside the flocked hole in the opening 22 on the ventral side 25 of the flocked hole and the inner hole area s1 in the top 41 where the hole area on the inner surface of the flocked hole on the inner surface of the flocked hole 24 is smallest The ratio is such that 0.35 ≦ s1 / S ≦ 0.65 from the standpoint that the hair bundle 21 can be reliably stopped and the hair bundle 21 can be dried more effectively. It is preferable to do this. Here, if the value of s1 / S is smaller than 0.35, the drying property is lowered, and if it is larger than 0.65, the retaining area becomes smaller, so that the hair pulling strength becomes insufficient and the hair bundle does not stop. There is a risk of protruding to the back.

  Similarly, when the hole shape of the flocked hole is circular, the inner diameter D at the opening 22 on the ventral hole ventral side 25 and the hole area inside the retaining surface 24 on the inner peripheral surface of the flocked hole are the smallest. The ratio of the inner diameter d1 of the top 41 to the toothbrush having a plurality of hair bundles from the viewpoint that the hair bundle 21 can be reliably stopped and the hair bundle 21 can be dried more effectively. Even if it is a single tuft toothbrush, it is preferable that 0.6 ≦ d1 / D ≦ 0.8. Here, if the value of d1 / D is smaller than 0.6, the drying property is lowered, and if it is larger than 0.8, the retaining area becomes smaller, so that the hair pulling strength becomes insufficient and the hair bundle does not stop. There is a risk of protruding to the back.

  From the viewpoint of promoting the drying of the hair bundle 21, it is better to increase the hole area s2 of the back side opening 29. However, if it is too large, the end of the planted hair bundle 21 becomes the back of the flocked base. It may be exposed on the side 26 and may be uncomfortable by touching the oral cavity during brushing. Therefore, the inner hole area s1 at the top 41 where the hole area inside the retaining surface 24 of the protrusion 23 on the inner peripheral surface of the flocked hole is the smallest, and the hole area s2 of the opening 29 on the back side of the flocked hole, It is desirable to set the ratio of 1 <s2 / s1 ≦ 2.

  Similarly, when the hole shape of the flocked hole is circular, it is better to increase the inner diameter d2 of the back side opening 29, but if it is too large, the end of the planted hair bundle 21 will be It may be exposed to the dorsal side 26 of the flocking table and may cause discomfort by touching the oral cavity during brushing. Therefore, the ratio of the inner diameter d1 of the top diameter 41 of the contact surface 24 of the projection 23 on the inner peripheral surface of the flocked hole to the inner diameter d2 of the opening 29 on the back side of the flocked hole is 1 <d2 / d1. It is desirable to set ≦ 1.4.

The cross-sectional area S in the straight columnar structure that forms the flock hole on the ventral side of the flocking table may be any size as long as it has a size sufficient to implant a hair bundle of a general size, and a toothbrush having a plurality of hair bundles. if, preferably 1.0 mm ² or more 4.6 mm ² or less. Further, if the single tuft toothbrush, preferably 7.0 mm ² or more 12.6 mm ² or less.

  Similarly, when the hole shape of the flocked hole is circular, the circumferential diameter D of the columnar structure on the side of the flocked table is 1.2 mm or more and 2.4 mm in the case of a toothbrush having a plurality of hair bundles. The following is preferable, and if it is a single tuft toothbrush, 3.0 mm or more and 4.0 mm or less are preferable.

  When it is set as the structure expanded from the top part 41 to the opening part 29 on the flocking table back side, the escape gradient is preferably 3 degrees or more and 10 degrees or less. If it is less than 3 degrees, defects such as biting of the molded product are likely to occur at the time of mold release, and if it is greater than 10 degrees, the hair bundle hits the oral cavity through the opening 29 on the back side during brushing, causing discomfort. The possibility of giving arises.

Planting inside the hole area s1 at the top 41 the smallest of the inner hole area of the abutting-stop surface 24 of the projection 23 in the pores in the peripheral surface, 0.4 mm ² or more 2.9 mm ² or less, s2 is flocked base molding Although it depends on the angle of the draft angle, it is preferably 0.45 mm ² or more and 4.0 mm ² or less. When s1 is less than 0.4 mm ² , the drying property of the hair bundle decreases, and when it is larger than 2.9 mm ² , the retaining area of the hair bundle becomes small, and sufficient hair pulling strength of the hair bundle cannot be secured. Therefore, it is not preferable. Also, if s2 is less than 0.45 mm ² , the drying property of the hair bundle decreases, and if it is greater than 4.0 mm ² , the hair bundle hits the oral cavity through the opening 29 on the back side during brushing, causing discomfort. This is not preferable because of the possibility of giving. For the same reason, the hole area s1 in the single tuft toothbrush is preferably 3.0 mm ² or more and 8.5 mm ² or less, and s2 is preferably 4.8 mm ² or more and 12.0 mm ² or less.

  When the hole shape of the flocked hole is circular, in the case of a toothbrush having a plurality of bristles, d1 is not less than 0.5 mm and not more than 2.0 mm, and d2 depends on the angle of the draft at the time of flocking table molding. 0.6 mm to 2.5 mm is preferable. If d1 is less than 0.5 mm, the drying property of the hair bundle decreases, and if it is larger than 2.0 mm, the retaining area of the hair bundle becomes small, and the hair pulling strength of the hair bundle cannot be secured sufficiently. It is not preferable. Further, if d2 is less than 0.6 mm, the drying property of the hair bundle is lowered. If it is larger than 2.5 mm, the hair bundle may hit the oral cavity through the opening 29 on the back side during brushing and give unpleasant feeling. This is not preferable because of the property. For the same reason, in the case of a single tuft toothbrush, d1 is preferably 2.0 mm or greater and 3.2 mm or less, and d2 is preferably 2.2 mm or greater and 3.8 mm or less.

  In the case of a toothbrush having a plurality of hair bundles, the diameter H of the flocked hole diameter in the case of a toothbrush having a plurality of hair bundles with respect to the thickness H from the opening 22 on the flocking table belly side to the top 41 of the protrusion 23 in the flocking table. In addition, it is desirable that the thickness is 2.5 mm or more in terms of comparative weighing. On the other hand, in the case of a single tuft toothbrush, the hair bundle itself is thicker than a toothbrush having a plurality of hair bundles.

  The thickness h from the top 41 to the opening 29 on the back side of the flocking table depends on the thickness of the filament forming the hair bundle and the number of filaments, but to prevent the hair bundle from protruding to the back side of the flocking table. In the case of a toothbrush having a plurality of bristle bundles, 0.2 mm or more is desirable. On the other hand, the single tuft toothbrush is generally configured so that the angle formed by the axial direction of the flock hole 12 in the flocking table 11 and the axial direction of the toothbrush handle is 90 °. Depending on the specifications, the angle may be set to be inclined. When the angle is set to 90 °, the thickness h from the top 41 to the opening 29 on the back side of the flocking table is desirably 1.0 mm or more, and when the angle is set to be inclined from 90 °. It is desirable that the thickness h formed by the central portion of the cross section in the circumferential direction of the flocked hole be 1.0 mm or more.

  In the case of a toothbrush having a plurality of hair bundles, the thickest portion of the toothbrush flocking table of the present invention as described above can be set to 4.0 mm or less. On the other hand, in the single tuft toothbrush, when the angle between the axial direction of the flocking hole 12 in the flocking table 11 and the axial direction of the toothbrush handle is set to 90 °, the thickness of the thickest part of the flocking table of the toothbrush is 8. It can be set to 0 mm or less. On the other hand, when the angle is set to be inclined from 90 °, the thickness formed by at least the central portion of the cross section in the circumferential direction of the flocking table can be set to 8.0 mm or less.

  The flat wire 13 is the same in material and size as a known flat wire used for general toothbrushes, whether it is a toothbrush having a plurality of bristles or a single tuft toothbrush. Good.

  The material used for the flocking table 11 may be a known material that is generally used. Although it is preferable to integrally form the handle portion of the toothbrush, the manufacturing cost and the number of processes are reduced, but it is not limited to this.

  There is no particular limitation on the material constituting the filament 14 of the hair bundle 21 to be implanted, and a material made of a known material is used as long as it has physical properties that can be used as a filament for the hairbrush of a toothbrush. For example, resin materials such as nylon, polyester, and polyolefin can be used.

  Hereinafter, based on an Example, Embodiment of this invention is described more concretely, This invention is not limited to these.

(Comparative Example 1)
As shown in FIG. 5 (a), a straight cylindrical hole (1.7mm diameter, 2.2mm depth) was drilled from the top of a 2.5mm thick PCTG resin to produce an evaluation model.

(Comparative Example 2)
As shown in FIG. 5 (b), a PCTG resin with a thickness of 2.5 mm is formed into a straight cylindrical shape (diameter 1.7 mm, depth 1.9 mm) from the top, and a truncated cone (upper diameter 1) continuously from the bottom. (7 mm, lower diameter 0.8 mm, depth 0.3 mm) was drilled to produce an evaluation model.

(Comparative Example 3)
As shown in FIG. 5 (c), a PCTG resin with a thickness of 2.5 mm is formed into a straight cylindrical shape (diameter 1.7 mm, depth 2.2 mm) from the top, and a cylindrical shape (diameter 0 with a step is formed below the PCTG resin. An evaluation model in which a hole having a depth of .8 mm and a depth of 0.3 mm was drilled was produced.

(Comparative Example 4)
As Comparative Example 4, a GUM dental brush (# 211) manufactured by Sunstar Co., Ltd., in which the flock hole did not penetrate to the back side, was used. The toothbrush has a flocking table thickness of 5 mm, a flocking hole with a straight cylindrical shape (1.7 mm in diameter, 3.3 mm in depth), and a truncated cone (on the flocking table ventral diameter on the back side of the flocking table). 1.7 mm, diameter of back of flocking table 1.2 mm, depth 0.5 mm) and has 24 hair bundles.

Example 1
As shown in FIG. 5 (d), a PCTG resin having a thickness of 2.5 mm is straight cylinder shape (diameter 1.7 mm, depth 1.9 mm) from the top, and a truncated cone shape (upper diameter 1 is continuously formed in the lower portion thereof. 0.7 mm, lower diameter 0.8 mm, depth 0.3 mm), and further, a straight cylindrical hole (diameter 0.8 mm, depth 0.3 mm) was continuously drilled in the lower part to produce an evaluation model.

(Example 2)
On the flocking table having a thickness of 3.5 mm, each dimension in FIG. 4 is 24, with D = 1.7 mm, d1 = 1.2 mm, d2 = 1.25 mm, H = 3.0 mm, and h = 0.5 mm. A toothbrush having a bristles was prepared.

(Evaluation 1: Through-hole finite element analysis test)
Finite element analysis was performed on the evaluation models of Comparative Examples 1 to 3 and Example 1. The evaluation model was meshed with a hexahedron, a load of 500 g (4.9 N) was applied from the upper part of each hole to the lower part, and the maximum stress and the maximum axial displacement applied to the lower part in the axial direction of the hole were measured.

  As shown in Table 1, the maximum stress and the maximum displacement of Example 1 were lower than those of Comparative Examples 1 to 3. That is, it was confirmed that the toothbrush of the present invention has a smaller load and less strain on the flocking table even when a hair bundle is implanted with a flat wire, compared to the conventional product.

(Evaluation 2: Dryability test)
To prepare the toothbrushes of the above Comparative Example 4 and Example 2, to eliminate as much as possible the influence of moisture remaining in the hair bundle on the measured value, and to allow the dryness of the flock hole itself to be directly reflected in the measured value The hair bundle was cut, leaving only 2 mm on the ventral table. Then, the weight of each toothbrush is measured, and the toothbrush is put into a 100 mL beaker filled with water from the head and shaken for 10 seconds while being placed in the beaker to blow air in the toothbrush bristle bundle and left for 3 minutes. After that, the toothbrush was lifted from the beaker, the toothbrush neck was lightly tapped with the edge of the beaker, the water drops on the flocking table were wiped with a tissue, and the toothbrush weight was immediately measured. About each toothbrush, the weight difference before and after putting in water was computed, and this was made into 0 hour value. Furthermore, the 0 hour value is the starting point, and then left still in a thermo-hygrostat (23 ° C., 85%), and the weight is measured after 1, 2, and 3 hours over time, before being put into a beaker. The difference from the weight was calculated. In the measurement, three toothbrushes of Comparative Example 4 and Example 2 were prepared, and the same measurement was performed for each of the three toothbrushes.

  As shown in FIG. 6, the measured value of Example 2 was higher than that of Comparative Example 4 at 0 hour, but the measured value after 1 hour was higher in Example 2. The measured value was lower than the measured value of Comparative Example 4. From the above, it has been confirmed that the hair-drying holes have a penetrating structure so that the drying property of the hair bundle after use is improved as compared with the conventional product.

1A, toothbrush 1B having a plurality of bristle bundles, single tuft toothbrush 11, flocking table 12, flocking hole 13, flat wire 14, filament 21, hair bundle 22, flocking hole ventral side opening 23, protrusion 24, stop Surface 25, ventral side 26, dorsal side 27, enlarged surface 28, end edge 29, opening 41, apex D with the smallest hole area inside the stop surface, inner diameter of the flocked hole in the flocked table ventral side opening d1, inner diameter d2 at the most contracted top of the inner diameter of the flocked hole diameter surface, flocked hole inner diameter H at the flocked table back side opening, from the flocked table ventral side to the most contracted top of the flocked hole reduced diameter surface The flocking table thickness direction length h, The flocking table thickness direction length from the flocking table belly side to the flocking table dorsal side from the most contracted top of the flocking hole reduced diameter surface

Claims (5)

A toothbrush having a flock hole in a flocking table, a bunch of hair bundles that are folded in two by bundling a plurality of filaments in the flock hole,
The flock hole is provided penetrating from the ventral side to the back side, and the inner hole area is gradually reduced in contact with the curved bottom portion of the hair bundle in the middle in the depth direction of the inner peripheral surface. those stop surface projections have a made of, and the toothbrush, characterized by have a tapered or R face the edge of the opening of the back side made.   The ratio of the area (S) of the opening on the ventral side of the flocked hole and the hole area (s1) at the top where the hole area inside the contact surface of the protrusion on the inner peripheral surface of the flocked hole is the smallest. The toothbrush according to claim 1, wherein 0.35 ≦ s1 / S ≦ 0.65.   The toothbrush according to claim 1 or 2, wherein the contact surface is a tapered surface or an outwardly convex curved surface.   Any one of Claims 1-3 which have an expansion surface which expands gradually from the top part where the hole area inside the contact face of the said protrusion in the inner peripheral surface of the said flocking hole became the smallest from the opening part of a back side. The toothbrush according to item. The ratio of the inner hole area (s1) at the top of the inner surface of the flocked hole and the inner hole area (s2) of the opening on the back side of the flocked hole is 1 <s2 / s1 ≦ 2. Toothbrush as described in.

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