KR20130004299A - Toothbrush - Google Patents

Abstract

An object of the present invention is to provide a toothbrush that is hard to lose hair bundles from a hair transplantation hole, is excellent in oral operability, and has sufficient strength. A flat plate-shaped head portion 10 provided with a plurality of hair transplanting holes 11 is provided on the hair-planting surface 10a, and the hair bundle 1b of the bristles is folded into two, and a flat line sandwiched therebetween is inserted into the hair-growing hole ( 11), the hair bundle 1b is a toothbrush implanted in the tuft hole 11, which has a thickness of 2.0 to 4.0 mm, and the outermost tuft hole in the width direction of the head part ( The toothbrush whose minimum distance (W) of 11a) and the short edge 12 is 0.4-0.9 mm.

Description

Toothbrush {TOOTHBRUSH}

This invention relates to the improvement of a toothbrush.

This application claims priority in 2010/24/24 based on Japanese Patent Application No. 2010-068132 for which it applied to Japan, and uses the content for it here.

Generally, a toothbrush is manufactured by fixing the hair | bristle bundle of the hair of nylon and polybutylene terephthalate (PBT) to a hair-line previously provided in the head part of a handle body in parallel. Since the hair | bristle bundle transplanted using the flat line is folded in two, it is hard to fall out from a hair-planting hole. As the material of the head portion, polypropylene (PP) is widely used in view of cost and formability.

By the way, the thickness of the head part in which a hair | bristle bundle is transplanted is thinner in order to make it easy to remove every corner of mouth, especially molar teeth with a toothbrush. For example, Patent Document 1 proposes a toothbrush in which the head portion is thinned to 3 to 4 mm while the handle body is made of polyacetal resin for the purpose of improving the operability in the oral cavity.

Patent Document 1: Japanese Patent Application Laid-Open No. 7-143914

However, even the toothbrush described in Patent Document 1 may not have sufficient operability in the oral cavity, and may result in a non-wipe portion. In addition, when the head portion is thinned, the strength at the break of the head portion may decrease. In addition, the appearance failure due to the occurrence of cracking or whitening at the edge portion of the head portion may occur with the decrease in strength.

This invention is made | formed in view of the said situation, and an object of this invention is to provide the toothbrush which is hard to pull out a hair | bristle bundle from a hair transplantation hole, is excellent in intraoral operability, and has sufficient strength.

The 1st aspect of this invention is equipped with the outline plate-shaped head part provided with the some hair-frilling hole in the woolen surface, folded the hair | bristle bundle of two hairs, and type the flat line inserted in between the hair-flocking holes, The said hair | bristle bundle is implanted in the said hairdressing hole, The head part is 2.0-4.0 mm in thickness, The shortest distance of the outermost hair-frilling hole in the width direction of the said head part and a short edge is 0.4- 0.9 mm toothbrush.

A 2nd aspect of this invention is the toothbrush of the said 1st aspect WHEREIN: The said head part is a toothbrush comprised from polybutylene terephthalate resin.

Since the hair | bristle bundle is hard to fall out from a hair transplantation hole, it is excellent in the oral operation property, and it has sufficient strength, the toothbrush of this invention can prevent the head part internal strength strength fall and an appearance defect.

BRIEF DESCRIPTION OF THE DRAWINGS The side view which shows one Embodiment of the toothbrush of this invention.
FIG. 2 is an enlarged plan view of the head of the toothbrush shown in FIG. 1. FIG.

One embodiment of the toothbrush of this invention is described.

1 and 2 show the toothbrush of the present embodiment. The toothbrush 1 of this embodiment has the handle body 1a provided with the head part 10, and the hair | bristle bundle 1b implanted in the planting hole 11 of the head part 10. As shown in FIG.

The handle body 1a has the head part 10, the holding part 20 hold | gripped at the time of use, and the neck part 30 arrange | positioned between the head part 10 and the holding part 20. As shown in FIG.

As for the handle body 1a in this embodiment, the head part 10, the holding part 20, and the neck part 30 are comprised by the same resin.

As resin which comprises the handle body 1a, a part of polybutylene terephthalate resin (PBT), polypropylene resin (PP), polyacetal resin (POM), and polycyclohexane dimethylene terephthalate Resin (PCTA) etc. which were substituted by phthalic acid can be used.

Moreover, as resin which comprises the handle body 1a, resin which has moderate rigidity and toughness is preferable, and resin which has a bending fracture modulus of 1900 Mpa or more and 80% or more of tensile fracture strain is preferable. Here, "bending elasticity modulus" is a value measured based on ISO 178, and "tensile fracture strain" is a value measured based on ISO 527-1, 2.

When the bending elastic modulus is 1900 MPa or more and the tensile fracture strain is 80% or more, the toughness of the handle body 1a is sufficiently high, and even if the head portion 10 is thinned, it is difficult to crack against impact, and the fracture surface is acute. This can be prevented.

Although there is no restriction | limiting in particular in the upper limit of the said bending elastic modulus and the said tensile fracture strain, If it is a resin used normally, the bending elastic modulus is 5000 Mpa or less, and the tensile fracture strain is 500% or less.

The polybutylene terephthalate resin is preferable at the point which can easily satisfy said bending elastic modulus and tensile fracture strain. Moreover, polybutylene terephthalate resin is excellent in chemical-resistance and heat resistance. Therefore, since the toothbrush 1 which used polybutylene terephthalate resin for the handle body 1a has little deterioration even if it uses for a long time, since it hardly breaks even if the hair | bristle bundle 1b is fixed strongly by a flat line, Becomes high quality.

The polybutylene terephthalate resin is a thermoplastic polyester produced by a polycondensation reaction using terephthalic acid or terephthalic acid dimethyl ester and 1,4 butanediol as a raw material. Novadullin, the toraycon made from Toray Corporation, etc. are mentioned.

The head part 10 is a substantially flat plate-shaped part, and the hair | bristle bundle 1b is implanted in the some tuft hole 11 provided in the seeding surface 10a. In this embodiment, the seedling surface 10a of the head part 10 is a substantially rectangular shape, and the edge of the uppermost side along the long side direction of the handle body 1a, while the edge 12 of the width direction is parallel to each other, The edge 13 is curved.

The thickness T of the head portion 10 is preferably 2.0 to 4.0 mm, preferably 2.5 to 3.5 mm. If the thickness T of the head portion 10 is less than 2 mm, the head portion break strength is lowered, so that the head portion 10 may be damaged during brushing, and a hair transplantation hole sufficient to support the hair bundle 1b in a flat line is provided. It becomes impossible to secure the depth of (11). On the other hand, when the thickness T of the head portion 10 exceeds 4 mm, the intraoral operability becomes insufficient.

The shortest distance W of the head part 10 of the outermost hair-frilling hole 11a of the width direction (direction perpendicular | vertical to a long side direction) of the head part 10, and the short edge 12 (henceforth this distance) (W) is called "border width W.") is 0.4-0.9 mm, and it is preferable that it is 0.6-0.8 mm. If the edge width W of the head portion 10 is less than 0.4 mm, the head portion break strength is insufficient, and the edge portion of the head portion 10 may be deformed due to the stress caused by the hair transplantation. When the edge width W exceeds 0.9 mm, the edge width W becomes wider with respect to the thickness T of the head portion 10, and the head portion 10 is placed on the gum or jaw mucosa when wiping the innermost molar or the like. Touches, and operability falls, and the wiping feeling becomes poor.

Moreover, in the head part 10, it is also preferable that the shortest distance of the tuft hole 11b of the outermost side of the long side direction of the head part 10, and the edge 30 of the front end side is also 0.4-0.9 mm. If the shortest distance between the tuft hole 11b and the front end side edge 13 is less than 0.4 mm, there exists a possibility that head part fracture strength may run short, and when it exceeds 0.9 mm, there exists a possibility that intraoral operability may fall.

The gripping portion 20 is a rod-shaped portion having a length that can be gripped by a user.

In the holding part 20, in order to improve gripping property, the soft resin may be partially or wholly covered.

As said soft resin, 5-100 soft resin of hardness (JISK6253 hardness test, test conditions JIS A) is preferable, and 20-60 soft resin is more preferable. If the hardness of the said soft resin is 5 or more, it will have sufficient softness and gripping property will improve more.

Specific examples of the soft resin include polyolefin-based thermoplastic elastomers, polystyrene-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, polyester-based thermoplastic elastomers, 1,2-polybutadiene-based thermoplastic elastomers, and ethylene- Vinyl acetate thermoplastic elastomers, polyvinyl chloride thermoplastic elastomers, natural rubber thermoplastic elastomers, fluorine thermoplastic elastomers, trans-polyisoprene thermoplastic elastomers, and the like.

When using polybutylene terephthalate resin as resin which comprises handle 1a, it is preferable to use a polyester thermoplastic elastomer as soft resin from a compatibility point. Examples of the polyester-based thermoplastic elastomers include Hytorel, manufactured by Toray DuPont, and Purima Roy, manufactured by Mitsubishi Chemical Corporation.

The neck part 30 is a part which connects between the head part 10 and the holding part 20. FIG. The width of the neck portion 30 is smaller than the width of the head portion 10. Since the width of the neck portion 30 is smaller than the width of the head portion 10, the head portion 10 can be easily inserted into the oral cavity.

The hair | bristle bundle 1b is comprised by the hair | bristle bundle folded in two, and is fixed to the head part 10 by the flat line clamped between the two hair | bristle bundles being type | mold in the hair-frilling hole 11.

As a material of the said bristles, for example, polyamide (for example, nylon 6-12, nylon 6-10, 12 nylon, etc.), polyester (for example, polyethylene terephthalate, polypropylene terephthalate, polybutyl) Lenterephthalates), polypropylene, elastomers, natural materials, and the like. Moreover, these materials may be combined.

The cross-sectional shape of the said bristles is not specifically limited, For example, circular shape, a triangular shape, a tetragonal shape, a hexagonal shape, a petal shape, circular arc shape, etc. are mentioned. Moreover, you may combine these shapes.

Further, the bristles may be processed into a wave shape, a twist shape, a zigzag shape, or the like beforehand.

The outer diameter of the bristles is preferably 3 to 15 mils (ie, 0.076 to 0.381 mm), and more preferably 5 to 10 mils (ie, 0.127 to 0.254 mm).

In addition, each hair hair may be a normal hair of approximately the same diameter except the hairline round part normally formed in the front end of the hair hair, or may be a taper hair whose outer diameter gradually becomes thinner toward a front end. These normal hairs and tapered hairs may be mixed, and may be changed for every hair transplant hole 11. The taper hair has a good penetration into the narrow gap, can realize a soft touch, and is more suitable for the removal and massage of the gum part.

As said taper hair, for example, the taper hair whose both ends as described in Unexamined-Japanese-Patent No. 6-141923 are tapered, and a single-sided taper as described in Unexamined-Japanese-Patent No. 57-50220. Machined taper hair, taper hair formed with a plurality of sharp parts in one hair as described in Japanese Patent Laid-Open No. 2002-58838, taper hair having a sea island structure described in Japanese Patent Laid-Open No. 9-322821 The taper hair of the poncho structure described in 2001-178542 is mentioned.

It is preferable that it is 7-15 mm, and, as for the length of the said bristles, it is more preferable that it is 8-13 mm. In addition, all the lengths of the said bristles may or may not be the same.

The chain surface formed by the front-end | tip of the whole hair | bristle bundle 1b is, for example, the plane parallel to the seedling surface 10a; A plane inclined with respect to the seedling surface 10a; According to the long side direction, it can be set as the curved surface, convex surface, concave surface, or wave-shaped uneven surface gradually spaced apart or gradually approaching the seedling surface 10a. From the point which is easy to carry out the said chain, the planar surface or curved surface which inclined so that it may become gradually closer to the seedling surface 10a as it goes from the front end to the rear end is preferable.

As for the length of the said flat line, the length which can fix | reliably fix a hair brim and does not produce a crack and whitening in the head part 10 is preferable. Specifically, a flat line 0.3 to 0.5 mm longer than the tuft hole 11 is preferable.

Although the height of the said flat line is not specifically limited, It is preferable that it is the range of 0.9-2.0 mm in order to ensure a hair transplantation ability, ensuring sufficient type strength. Moreover, for the same reason, the thickness of the flat line is preferably 0.20 to 0.25 mm.

Moreover, in order to avoid generation | occurrence | production of a crack and whitening, in the said flat line type angle, the range of 5-80 degrees is preferable with respect to the long side direction of the handle body 1a, and the range of 15-30 degrees is more preferable. Do. The said flat line type | mold and an angle may be same or different in all the flat lines.

As a material of the said flat wire, although metal, plastic, etc. can be used, a metal is preferable from a viewpoint of strength, productivity, and cost, and brass or aluminum is more preferable.

Grooves and fine unevenness may be formed in the surface of the said flat line in order to make it hard to fall out from the hair-planting hole 11.

In the present embodiment, the tuft hole 11 is circular, and is disposed in a lattice shape on the tuft surface 10a of the head portion 10.

Regarding the shape of the tuft hole 11 in the depth direction, it may be a circumferential shape in which the shape does not change with respect to the depth direction, or may be a tapered shape such that the hole diameter decreases as it goes downward, and a step is formed in the middle of the hole. The formed shape may be sufficient. Moreover, the shape in which the step | step and taper were formed may be sufficient, respectively. In addition, a chamfering process of about 0.3 mm may be performed at the bottom of the tuft hole 11.

It is preferable that the hole diameter of the opening part of the tuft hole 11 is 1.0-2.0 mm (that is, area 0.75-3.1 mm <2>). When the hair | bristle bundle 1b is planted by such a hole diameter, the contact feeling to a gum part improves and it becomes a toothbrush with a high sense of insertion of a mother wire to a minute gap, such as an interdental part.

In the toothbrush 1 demonstrated above, since the thickness T of the head part 10 is 2.0 mm or more, and the edge width W is 0.4 mm or more, sufficient strength can be ensured, As a result, a head part is obtained. It is possible to prevent a decrease in strength or poor appearance. Moreover, in the toothbrush 1, since the thickness T of the head part 10 is 4.0 mm or less, and the rim width W is 0.9 mm or less, the contact of the head part 10 in the mouth is prevented. It can prevent and, as a result, it is excellent in intraoral operation property.

Moreover, in the toothbrush 1, since the hair | bristle bundle 1b is being fixed to the tuft hole 11 by a flat line, it is hard to pull out.

In addition, this invention is not limited to the said embodiment.

The head portion 10, the grip portion 20, and the neck portion 30 do not have to be made of the same resin.

In addition, although the head part 10 is preferably in the said range with the same thickness as a whole as mentioned above, it is a part of the neck part 30 side, Preferably 1/3 of the length of the head part 10 is preferable. The following may be thick. By thickening the neck part 30 side of the head part 10, the connection with the neck part 30 can be made smooth.

In addition, in the toothbrush of this invention, the neck part 30 may be abbreviate | omitted. That is, the handle may be composed of the head portion 10 and the gripping portion 20.

In addition, the head part 10 may not be a roughly rectangular shape, for example, circular shape, an elliptical shape, etc. may be sufficient as it.

The shape of the opening of the tuft hole 11 may be, in addition to a circular shape, a polygon such as a circle, a triangle, a quadrilateral, or another shape. In addition, all of the tuft holes 11 may be made into the same opening shape, and two or more opening shapes may be combined.

The arrangement pattern of the hair transplantation hole 11 may be zigzag-like, and the pattern which forms the group of circular arc-shaped hair-frilling hole which curved to the center side of the head part 10 in the edge part of the both ends of the width direction of the head part 10 may be sufficient. .

In the case of having the above-described arc-like group of hair transplant groups, the hair bundle 1b tends to be in close contact with the gum part. From the point of raising the subtractive feeling of a tooth surface, it is preferable that the hair | bristle bundle 1b planted by the circular tuft-shaped tuft hole group is longer than the hair | bristle bundle 1b which was planted in the tuft hole other than the said tuft hole group. In that case, it is preferable that it is 0.3-2.0 mm, and, as for the difference of average hair length, it is more preferable that it is 0.5-1.5 mm.

In this invention, although the hair | bristle bundle 1b itself can also be made into circular arc shape, also in that case, it is provided in the edge part of the both ends of the width direction of the head part 10, and the circular hair | bristle bundle 1b is set to the other hair | bristle bundle 1b. It is preferable to make it longer than).

Example

In the following examples, the following resins were used.

Polybutylene terephthalate (PBT): Novadulin 5010, manufactured by Mitsubishi Engineering Plastics, Inc.

Resin (PCTA) which substituted a part of polycyclohexane dimethylene terephthalate with isophthalic acid: BR203 by Eastman Chemical Co., Ltd.

Polypropylene (PP): J700GP manufactured by Prime Polymer Co., Ltd.

Polyacetal (POM): HC490 made by Asahi Chemical Co., Ltd.

In addition, the bending elastic modulus of the used resin was measured based on ISO 178. Tensile fracture strain was measured in accordance with ISO 527-1, 2. Their results are shown in Table 1.

(Examples 1 to 8, Comparative Examples 1 to 3)

Injection molding using the resin shown in Table 1, the hole diameter of the tuft hole is 1.55 mm, and the distance between the tuft holes is 0.725 mm, and the thickness (W), width (L), and edge shown in Table 1 are shown. The handle body provided with the head part, the holding part, and the neck part of width W was produced.

Subsequently, the hair | bristle bundle of bristles (a hair | bristle: 8mil, length: 9.0mm, flat) made of nylon was folded into two, and a flat line (width: 1.3mm, length: 2.1mm, thickness: 0.25) is folded in the folded part. Mm) were inserted, and the hair bundle was implanted into the tuft hole formed in the head. This obtained the toothbrush.

Intraoral operability, head fracture strength, hair bundle support strength, and appearance of the obtained toothbrushes were evaluated as follows. The evaluation results are shown in Table 1.

(1) oral operability

Ten subjects actually used the toothbrush of each Example and each comparative example, and scored the following reference | standard about the operability of the toothbrush in an oral cavity. And the intraoral operability was evaluated by the average value of ten people. The higher the score, the better the oral operability.

[Score]

7 points | pieces: Very good.

6 points: Pretty good.

5 points | pieces: A little good.

4 points | pieces: I cannot say which way.

3 points | pieces: A little bad.

2 points | pieces: Not very good.

1 point | piece: Very bad.

[Evaluation standard]

◎: 5.5 points or more

(Circle): Average value 5.0 points or more and less than 5.5 points

△: 4.0 or more average value less than 5.0

X: Below average 4.0 points

(2) head strength

The part which came out from the hair transplantation hole of the bristles of the bristles of the toothbrush was cut | disconnected, and the hair transplantation surface side of the head part was smoothed. Thereafter, it was fixed to an Izot impact tester manufactured by Dongyang Precision Machinery Co., Ltd., was impacted by a hammer from the side of the seedling surface, and the impact energy when the head part was broken was measured (measured number 10), and the average value was obtained. And the following references | standards evaluated.

[Evaluation standard]

(Circle): Average value 0.3J or more

△: average value 0.15J or more and less than 0.3J

×: average value less than 0.15J

(3) hair bundle support strength

The entire hair in one hole is gripped by a dedicated mechanism, and the maximum tensile stress (N) from the hair growth hole to the hair loss is measured using a Shimadzu Corporation Autograph (tension speed 20 mm / min) (n = 20 ) And evaluated according to the following criteria. The higher the hair bundle support strength is, the harder the hair bundle is to fall out.

[Evaluation standard]

○: average value 20N or more

△: average value 10N or more but less than 20N

×: average value less than 10N

(4) appearance

Ten toothbrushes of each example and each comparative example were produced, and the occurrence of edge deformation, cracking, whitening and warping of the head portion was evaluated based on the following evaluation criteria by visual observation.

[Evaluation standard]

○: Incidence of deformation, cracking, whitening and warping: 0%

△: incidence of deformation, cracking, whitening and warping: less than 20%

×: incidence of deformation, cracking, whitening and warping: 20% or more

In the toothbrush of Examples 1-8 whose thickness T of the head part is 2.0-4.0 mm, and the edge width W is 0.4-0.9 mm, intraoral operability was excellent. Especially, in the toothbrush of Examples 1-5 which made resin of a handle body the polybutylene terephthalate resin, it is excellent in an external appearance and has sufficient head part fracture strength. Moreover, the toothbrush of Examples 1-6 and 8 other than Example 7 which made resin of a handle body the polypropylene resin has high hair | bristle bundle support strength.

On the other hand, the toothbrush of the comparative example 1 in which the line | wire width W of the head part was less than 0.4 mm had low head part fracture strength, and the appearance defect was also shown.

The toothbrush of the comparative example 2 in which the thickness T of the head part exceeded 4.0 mm, and the toothbrush of the comparative example 3 in which the line width W of the head part exceeded 0.9 were low in oral operability.

(Industrial availability)

INDUSTRIAL APPLICABILITY The present invention is extremely useful in the industry because it is difficult for hair bundles to fall out of the hair transplantation hole, and it is excellent in oral operability and can provide a toothbrush having sufficient strength.

1: toothbrush
1a: handle body
1b: hair bundle
10: head part
10a: cotton wool
11, 11a, 11b: planting hole
12, 13: hem border
20: holding part
30: neck part

Claims (2)

The hair | bristle bundle is equipped with the said hair | bristle bundle by providing the substantially flat plate-shaped head part provided with the several hair-planting hole in the hair-planting surface, folding the hair | bristle bundle of two hairs, and inserting the flat line interposed between them to the said hair-planting hole. As a toothbrush implanted in a hole,
The said head part is 2.0-4.0 mm in thickness, The toothbrush characterized by the shortest distance of the outermost tuft hole of the said head part in the width direction and a short edge 0.4-0.9 mm. The method of claim 1,
A toothbrush, wherein said head portion is made of a polybutylene terephthalate resin.

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