JP2000325145A - Toothbrush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-quality toothbrush having sufficient hair falling strength without causing the breakage of a hair transplant pin of a hair transplanting machine and the bending of a flat line, cracking and whitening of a toothbrush head part. SOLUTION: A head part 1 is provided with a plurality of hair transplant holes(HTHs) 2, and in a toothbrush in which a hair bundle is transplanted by driving a flat line 3 that is longer than a diameter D of HTH into HTH 2 so that a bottom part 3a of the flat line reaches a depth of at least 1/2 or more of a depth H of HTH, the ratio of a difference between the flat line length L and the diameter D of HTH to the diameter D of HTH, (L-D)/D, is set at 0.033 to 0.80. The ratio of 1/2 of a difference between the flat line length L and the diameter D of HTH to a straight line clearance distance P between adjacent HTHs 2 and 2 along the direction of about the extension of the flat line 3, (L-D)/2P, is set at 0.025 to 0.50. In addition, a difference between the flat line length L and the diameter D of HTH, (L-D), is set at 0.10 to 0.80 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothbrush in which a hair bundle is planted using a flat wire.

[0002]

2. Description of the Related Art Generally, a toothbrush is formed by bundling a plurality of brushes in a round hole having a diameter of about 1.5 to 2.0 mm formed on a flocked surface of a toothbrush head, and forming a small piece of metal called a flat wire. Alternatively, the hair is implanted by folding it into two pieces using a small plastic piece and driving it. For example, 8 mil bristles (1
For example, in the case where the mill is 1/1000 inch), the number of brushes of the implanted bristle bundle is 30 to 60 per hole (15 to 30 per hole if the hair is not folded before the implantation). The distance between the holes is about 0.5 to 1.2 mm, and the hairs are generally planted regularly in a grid pattern.

[0003]

In the case of a toothbrush in which a bristle bundle is implanted using a flat wire, it is necessary to fix the bristle bundle with the flat wire, so that the length of the flat wire must be longer than the hole diameter. There is, but if it is too long, the driving resistance at the time of flocking increases,
The flocking pin of the flocking machine or the flat line itself may be bent, and further, the toothbrush head may be cracked or whitened. Further, if the length is not shorter than the hole diameter, if it is too short, there is a problem that, due to a displacement at the time of driving, only one side exerts an anchoring action, and the hair removal strength of the hair bundle is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and does not cause breakage of a flocking pin of a flocking machine, bending of a flat line, cracking or whitening of a toothbrush head, and the like. An object of the present invention is to provide a high-quality toothbrush having sufficient hair removal strength.

[0005]

In order to achieve the above object, the present invention provides a head having a plurality of planted holes in a head portion, wherein the planted hole is provided with a flat line longer than the diameter of the planted hole. The ratio of the difference between the flat wire length L and the flocking hole diameter D with respect to the flocking hole diameter D in the toothbrush having the bristle bundle implanted by driving the bottom so as to reach a depth of at least 毛 or more of the flocking hole depth ( (LD) / D is 0.033 to 0.80.

The ratio (LD) / (1/2) of the difference between the length L of the flat wire and the diameter D of the flocking hole to the linear gap distance P between adjacent flocking holes along the direction of extension of the flat wire. 2P is 0.0
It is characterized by having a hair bundle planted so as to be 25 to 0.50.

Further, a difference (LD) between the length L of the flat wire and the diameter D of the flocking hole is 0.10 to 0.80 mm.

[0008] In the case of the above construction, the flat wire is neither too long nor too short with respect to the flocking hole and has an optimum length, so that the impact at the time of driving the flat wire can be reduced. The impact of the driving impact on the surroundings can be reduced. For this reason, it is possible to prevent breakage of the flocking pin of the flocking machine, bending of the flat line, cracking and whitening of the toothbrush head, and provide sufficient hair removal strength.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. FIG. 1A is a schematic longitudinal sectional view showing the relationship between a flocking hole and a flat line in the toothbrush of the present invention, and FIG. 1B is a schematic plan view showing the relationship between a flocking hole and a flat line. Note that, for simplicity of description, the illustration of the hair bundle implanted in the implanted hole is omitted.

Normally, the thickness of the toothbrush head portion 1 of this type of toothbrush is usually about 3.0 to 5.0 mm in consideration of the operability and strength of the head portion. Flocked hole 2 provided in part 1
Has a depth H of about 2.5 to 4.0 mm. The bristle bundle (not shown) in which the brushes are bundled is folded in two by the flat wire 3 and is driven into the flocked hole 2 to be planted.
In order to ensure sufficient hair removal strength, it is necessary to effectively press and fix the hair bundle that is bent and driven into two between the bottom 3a of the flat wire 3 and the bottom of the flocking hole 2. Therefore, in order to realize this, the flat wire 3 is usually provided at the bottom 3a.
Is generally driven until the depth reaches at least １ ／ or more of the depth H of the flocking hole 2.

The toothbrush according to the present invention is the toothbrush having the above-mentioned structure, wherein the ratio (LD) / D (1) of the difference between the flat wire length L and the flocking hole diameter D with respect to the flocking hole diameter D is 0. 0.033-0.80, more preferably 0.08-
It is set to be 0.50. Here, the flocking hole diameter D is a straight line distance measured along the driving flat line 3.

As described above, by making the length L of the flat wire 3 longer than the hole diameter D of the flocking hole 2 by a certain ratio, the flat wire 3 is not too long with respect to the flocking hole 2 or is short. The length can be set to an optimum length without being too short. As a result, it is possible to reduce the impact at the time of driving the flat wire, and to reduce the impact on the surroundings, thereby preventing breakage of the flocking pin of the flocking machine, bending of the flat wire, cracking and whitening of the toothbrush head, and the like. As well as providing sufficient hair removal strength.

The ratio (L) of 1/2 of the difference between the length of the flat wire L and the diameter D of the flocking hole to the linear gap distance P between the flocking holes 2 and 2 adjacent to each other along the substantially extending direction of the flat wire 3. −D) / 2P (2) was set to be 0.025 to 0.50.

Normally, the implantation angle of the flat wire 3 at the time of flocking is shifted in the range of a rotation angle of about 30 ° so as not to be aligned on a straight line as illustrated in FIG. The impact when the flat wire 3 is driven into the flocking hole 2 is easily transmitted along the substantially extending direction of the flat wire 3, and cracks and whitening may occur between the nearest flocking holes along the substantially extending direction. Many.

Therefore, in the present invention, the difference between the length L of the flat wire and the diameter D of the flocking hole D with respect to the linear gap distance P between the nearest flocking holes 2 and 2 arranged substantially in the direction of the flat line. By setting the ratio to 0.025 to 0.50 as described above,
Further, the occurrence of cracks and whitening is prevented. In addition,
This ratio is more preferably set in the range of 0.05 to 0.40.

Further, the difference (LD) between the flat wire length L and the flocking hole diameter D (3) was set to be 0.10 to 0.80 mm. 1.5 to 2.0 as the hole diameter D of the flocking hole 2 which is usually used frequently
If the difference between the flat wire length L and the flocking hole diameter D is set within the above range, the occurrence of cracks and whitening can be further eliminated. In addition, about this dimensional difference, 0.2
A range of 0 to 0.60 mm is more preferable.

As a material of the brush constituting the hair bundle, a commonly used polyamide (eg, nylon 6-12, nylon 6-12,
Nylon 6-10, 12 nylon, etc.), polyester (eg, polybutylene terephthalate, polyethylene terephthalate, etc.), polypropylene and the like can be used. Of course, a composite fillet combining these may be used. Also, the cross-sectional shape of the brush is mainly circular, but is not particularly limited to a circular shape.

The brush thickness is 3 to 11 mils (0.076 to
0.297 mm), preferably 6-10 mils (0.15 mm
2 to 0.254 mm).

Regarding the cross-sectional shape of the hair bundle obtained by bundling the brushes,
The shape is not limited to a circle, and various shapes can be adopted. Of course, a single toothbrush head may have a plurality of bristle bundles of various shapes, and can be used in combination as appropriate in consideration of usability, brushing feeling, cleaning effect, and the like.

The shape of the flat wire 3 generally has a height h =
1.3 to 2.0 mm, thickness d = 0.22 to 0.25 mm
The degree is used. As the material, brass or aluminum is generally used, but other metals or resins such as plastics may be used as long as they have sufficient mechanical strength to withstand the driving.

The cross-sectional shape of the flat wire 3 is not limited to a rectangle, but may be made uneven so as to be notch-shaped so that the flat wire 3 is hard to be pulled out from the flocked hole 2. In addition, the cutting line shape at the time of flocking is devised so as not to be easily pulled out. Is also preferred.

As the material of the toothbrush handle including the toothbrush head portion 1, for example, polypropylene, polyethylene, polyester, polyamide, polymethyl methacrylate, ABS and the like can be used, but polypropylene is preferable from the viewpoint of cost and workability. Further, it is also preferable to form a multicolor molded handle in which these resins are combined with each other or in combination with a thermoplastic elastomer.

When a material having high impact strength or a high grade material is used, cracks and whitening hardly occur, so that the dimensions of the flat wire 3 can be set relatively freely. Is not so high and the notched Izod impact value is 1.5-15 KJ / m ² (preferably 1.5-10 KJ / m ² ), the present invention is considered to be more effective. Become.

Furthermore, if all of the brushes, handles, and flat wires constituting the bristle bundle are made of the same material, it is advantageous for disposal and recycling after use. If a resin material having good biodegradability is used, a toothbrush excellent in disposability can be obtained.

[0025]

According to the present invention, it is possible to prevent breakage of the flocking pin of the flocking machine, bending of the flat line, cracking and whitening of the toothbrush head, and also provide sufficient hair removal strength. It is possible to efficiently provide an inexpensive toothbrush. In addition, since there is no possibility that the toothbrush head is cracked or whitened, it is possible to sufficiently cope with the recent increase in the flocking speed (the number of shots).

[Brief description of the drawings]

FIG. 1 shows an embodiment of a toothbrush according to the present invention,
(A) is a schematic longitudinal sectional view showing the relationship between a flocking hole and a flat line,
(B) is a schematic plan view showing the relationship between a flocking hole and a flat line.

FIG. 2 is a schematic plan view showing a relationship between a flocking hole and a flat line when the flat line is driven obliquely at a different driving angle.

[Explanation of symbols]

 1 Head part 2 Flooding hole 3 Flat wire 3a Bottom part of flat wire D Flooding hole diameter H Flooding hole depth P Linear gap distance h Flat wire width d Flat wire thickness

Claims (3)

[Claims] 1. A head having a plurality of flocked holes in a head portion, wherein a flat line longer than the diameter of the flocked hole is formed in the flocked hole, and the bottom of the flat wire extends to at least a half or more of the depth of the flocked hole. In the toothbrush in which the bristle bundle was planted by being driven so as to reach the ratio, the ratio (LD) / D of the difference between the flat wire length L and the planted hole diameter D to the planted hole diameter D was 0.033 to 0.80. What is claimed is: 1. A toothbrush having a bristle bundle planted as such. 2. The ratio (LD) / 1/2 of the difference between the length L of the flat wire and the diameter D of the flocking hole relative to the linear gap distance P between adjacent flocking holes along the direction of extension of the flat wire. 2P is 0.025
The toothbrush according to claim 1, having a bristle bundle planted so as to have a size of about 0.50. 3. The difference between the length L of the flat wire and the diameter D of the flocking hole (L−
3. The toothbrush according to claim 1, wherein D) is 0.10 to 0.80 mm.