WO2017170126A1

WO2017170126A1 - Toothbrush

Info

Publication number: WO2017170126A1
Application number: PCT/JP2017/011730
Authority: WO
Inventors: 紗弥野澤; 金丸　直史
Original assignee: ライオン株式会社
Priority date: 2016-03-28
Filing date: 2017-03-23
Publication date: 2017-10-05
Also published as: TW201733493A; JP2017176224A; CN108778047A; KR20180127964A; TWI734760B

Abstract

The purpose of the present invention is to provide a toothbrush with which cervical regions of back teeth can be thoroughly cleaned. Provided is a toothbrush including a head section (10) in which a plurality of bristle implanting holes (12a) are provided in a bristle implanting surface (12), and in which bundles of bristles are implanted in the bristle implanting holes, wherein the head section is made of polyacetal resin or polybutylene terephthalate resin, the minimum thickness of the head section is 2.0 mm to 3.0 mm, and the relationships 6 < (S/W1) < 9 and 3 < (L/W2) < 5 are satisfied, where W1 is the maximum width in the lateral direction of the head section; S is the total area of the plurality of bristle implanting holes; L is the maximum length in the longitudinal direction of a region in the head section in which the bristle implanting holes are formed; and W2 is the maximum width in the lateral direction of the region in which the bristle implanting holes are formed.

Description

toothbrush

The present invention relates to a toothbrush.
This application claims priority on March 28, 2016 based on Japanese Patent Application No. 2016-063573 filed in Japan, the contents of which are incorporated herein by reference.

In a toothbrush, the head part may be made thin in order to improve operability and allow the entire oral cavity to be cleaned. In Patent Document 1, the head portion is formed of a polyacetal resin or polybutylene terephthalate resin, and the thickness of the head portion is set to 2 mm or more and less than 3 mm, thereby improving the oral operability and sufficient brush holding strength and A toothbrush that maintains the bending strength of the head portion is disclosed.

JP 2011-004852 A

In order to remove the plaque of the back teeth, which is said to be especially left unpolished in the oral cavity, it is important to firmly polish the tooth neck on the buccal side, which is particularly difficult to polish among the back teeth. The toothbrush disclosed in No. 1 was not sufficient.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a toothbrush capable of firmly polishing the back neck of the tooth.

According to the first aspect of the present invention, there is provided a toothbrush comprising a head portion provided with a plurality of flocked holes on a flocked surface, and a hair bundle of hairs implanted in the flocked hole, wherein the head portion is , Made of polyacetal resin or polybutylene terephthalate resin, the minimum thickness of the head portion is 2.0 mm or more and 3.0 mm or less, the maximum width in the short direction of the head portion is W1, and the plurality of flock holes When the total area of S is S, the maximum length of the region where the flocked hole is formed in the longitudinal direction of the head portion is L, and the maximum width of the region where the flocked hole is formed in the short direction is W2. 6 <(S / W1) <9 and 3 <(L / W2) <5 are satisfied, respectively.

In the toothbrush of the present invention, it is preferable that the maximum width of the head portion is 8 mm or less, and the number of rows of the hair bundles arranged in the short direction of the head portion is 3 rows or less.

In the present invention, it is possible to polish the back neck of the back tooth firmly.

It is a figure which shows embodiment of this invention, Comprising: It is a front view of a toothbrush. It is a top view which shows the flocking surface of the head part which comprises the toothbrush of FIG. It is a figure which shows the specification and evaluation of an Example and a comparative example.

Hereinafter, embodiments of the toothbrush of the present invention will be described with reference to FIGS. 1 to 3.
The toothbrush of this embodiment is shown in FIG. 1 and FIG. FIG. 1 is a front view of the toothbrush 1, and FIG. 2 is a plan view showing a flocked surface 12 of a head portion 10 constituting the toothbrush 1.

The toothbrush 1 of the present embodiment includes a head portion 10 in which a bristles 11 for bristles are planted, a neck portion 20 extending from the proximal end side of the head portion 10, and extending from the proximal end side of the neck portion 20. The handle portion 30 (hereinafter, the head portion 10, the neck portion 20, and the handle portion 30 are collectively referred to as a handle body).

The handle body is integrally formed in a long shape as a whole. For example, the handle body is obtained by injection molding using a resin as a material.
As the material of the handle body, polypropylene resin (PP), polyacetal resin (POM), polystyrene resin (PS), polyethylene terephthalate resin (PET), polybutylene terephthalate resin (PBT), acrylonitrile butadiene styrene resin (ABS), pore relate Resin, polycarbonate resin, acrylonitrile styrene resin (AS), etc. are mentioned. Among these, a polyacetal resin or a polybutylene terephthalate resin is preferable because it has high strength and can easily reduce the thickness of the head portion.
The above resins may be used alone or in combination of two or more.
Further, the handle body may be partially or wholly covered with a flexible resin such as an elastomer in order to improve gripping properties.

2, a plurality (23 in FIG. 2) of flocked holes 12a are formed on the flocked surface 12 which is the surface of the head portion 10, and the hair bundle 11 is flocked in the flocked hole 12a. The flocking holes 12 a are arranged in three rows in the short direction of the head portion 10. The number of rows of the flock holes 12a in the short direction is preferably 3 rows or less from the viewpoint of insertion into the oral cavity. Also, the maximum width of the head portion 10 in the short direction is preferably 8 mm or less from the viewpoint of insertion into the oral cavity.

The minimum thickness of the head unit 10 is preferably 2.0 mm or more and 3.0 mm or less. If the minimum thickness of the head part 10 is less than or equal to the upper limit value, the operability in the oral cavity of the toothbrush 1 can be improved, and if the minimum thickness is greater than or equal to the lower limit value, strength reduction of the head part 10 can be prevented.

The hair constituting the hair bundle 11 includes hairs (taper hairs) whose diameter gradually decreases toward the hair tips, and hairs having the same outer diameter (straight hairs) except for the rounded portion of the hair tips. Further, it is possible to use hair for which the hair tip has a shape such as a spatula shape, a spherical shape, or a tip crack shape.

Examples of the hair material include polyamide (eg, 6-12 nylon, 6-10 nylon), polyester (eg, polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate), polyolefin (eg, polypropylene), elastomer ( Examples: Synthetic resin materials such as olefin and styrene. These resin materials may be used alone or in combination of two or more.
Further, the bristle may have a multi-core structure having a core part and at least one or more sheath parts provided outside the core part.

The cross-sectional shape of the bristle is preferably a circle, but is not necessarily limited to a circle, and may be any shape depending on the intended use of the toothbrush 1. For example, the shape may be an ellipse, a polygon (for example, a triangle, a quadrangle, a pentagon, a hexagon, or the like), an irregular shape (for example, a star shape, a three-leaf clover shape, a four-leaf clover shape, or the like).

The hairs constituting the hair bundle 11 may all have the same thickness, or two or more different types of hairs may be combined. In addition, from the viewpoint of usability in the oral cavity and usability, it is preferable to shorten the hair length of the hair as the diameter of the hair selected is smaller. Further, a plurality of hairs having different thicknesses may be used in combination depending on purposes such as a feeling of use, a feeling of cleaning, a cleaning effect, and durability.

The flocking method of the hair bundle 11 is a flat-wire-type flocking method in which the hair bundle 11 is planted in the flocked hole 12a by folding the bristles of the hair in two and driving a flat wire sandwiched between them into the flocked hole 12a. Alternatively, a heat welding type flocking method in which the hair bundle 11 is heat welded to the head portion 10 may be used, but a flat wire type flocking method is preferable from the viewpoint of low cost. The flat line passes through the center of the flock hole 12a and is placed in the flock hole 12a so as to straddle the flock hole 12a. Examples of the material of the flat wire include metal pieces such as brass and stainless steel, and other examples include hard plastic and biodegradable plastic.

In the present embodiment, the head portion 10 has a minimum thickness in the range of 2.0 mm to 3.0 mm, and is thinner than the head portion of a conventional toothbrush, so that intraoral operability is improved.
Further, the head portion 10 has flocking holes 12a arranged in a lattice pattern, the maximum width in the short direction (vertical direction in FIG. 2) of the head portion 10 is W1, the total area of the plurality of flocking holes 12a is S, When the maximum length of the region where the flocked hole 12a is formed in the longitudinal direction (left and right direction in FIG. 2) of the head portion 10 is L, and the maximum width of the region where the flocked hole 12a is formed in the short direction is W2. , And are set so as to satisfy the following expressions (1) and (2), respectively.
6 <(S / W1) <9 (1)
3 <(L / W2) <5 (2)

The length L of the region where the flocked hole 12a is provided in the longitudinal direction is the distance between the outer edges of the flocked hole 12a arranged on the outermost side in the longitudinal direction. Similarly, the maximum width W2 of the region where the flocked hole 12a is provided in the short direction is the distance between the outer edges of the flocked hole 12a arranged on the outermost side in the short direction.

Formula (1) shows the suitable range (length in which the hair bundle 11 is provided) of the length of the flock hole 12a (hair bundle 11) in the longitudinal direction per unit length in the short direction of the head portion 10. Yes. When the value of S / W1 is below the lower limit, the amount of the hair bundle 11 that contacts the back neck portion becomes small and it becomes difficult to polish sufficiently, or the maximum width W1 of the head portion 10 is large and the operability is high. May be reduced. On the other hand, when the value of S / W1 exceeds the upper limit value, the maximum width W1 of the head 10 is reduced, or the amount of the hair bundle 11 that contacts the back neck of the back tooth is excessively increased in the longitudinal direction, resulting in poor operability. There is a possibility of becoming.

On the other hand, since the head unit 10 of the present embodiment satisfies the relationship of the above-described formula (1), an appropriate amount of the bristles 11 can be applied to the back teeth without reducing the operability of the toothbrush 1. Because of the contact, the tooth neck can be polished well.

Formula (2) is a preferable range of the length in the longitudinal direction per unit length in the short direction (preferable length in the longitudinal direction in which the hair bundle 11 is disposed) with respect to the region where the flock holes 12a are formed. Range). When the value of L / W2 is lower than the lower limit, the longitudinal region where the hair bundle 11 is formed is shortened similarly to the formula (1), and the number of times of brushing (the head portion 10) when brushing the cervical portion of the back teeth is shortened. The number of reciprocating movements) may need to be increased, or the maximum width W2 may be large and the operability may be reduced. On the other hand, if the value of L / W2 exceeds the upper limit value, the longitudinal region in which the hair bundle 11 is formed becomes long, and the operability may deteriorate.

On the other hand, since the head unit 10 of the present embodiment satisfies the relationship of the above formula (2), it is possible to avoid a decrease in the operability of the toothbrush 1, and in the longitudinal direction in which the hair bundle 11 is formed. Since the area is set to an appropriate length, the back neck of the back tooth can be firmly polished with an appropriate number of brushings.

[Example]
EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples. However, the present invention is not limited to the following examples, and can be appropriately modified and implemented without departing from the gist thereof.

(Materials used)
<Examples 1 and 2 and Comparative Examples 1 and 3>
Handle body; polyacetal resin hair; polybutylene terephthalate resin <Example 3>
Handle body; Polybutylene terephthalate resin hair; Polybutylene terephthalate resin <Comparative Example 2>
Handle body; saturated polyester resin hair; polyamide (nylon (registered trademark))

(Examples 1 to 3, Comparative Examples 1 to 3)
According to the specifications shown in FIG. 3, the handle body is manufactured by injection molding, the hair bundle 11 is folded in two, and the flat wire sandwiched between the two is driven into the flock hole 12a, thereby bringing the bunch 11 into the flock hole 12a. The toothbrush 1 of each example was obtained.
Each case was evaluated for intraoral operability and cervical cleaning power. In the evaluation of intraoral operability, “very good” was evaluated as “◎”, “good” as “good”, “slightly bad” as “△”, and “very bad” as “poor”. The evaluation of the cleaning power of the cervix was evaluated as 高い for very high, ◯ for slightly high, △ for slightly low, and × for very low.

As shown in FIG. 3, when the minimum thickness of the head part 10 is 2.0 mm or more and 3.0 mm or less and the head part 10 satisfies the formula (1), the toothbrush 1 has good oral operability. It was confirmed. In addition, when the head portion 10 satisfies the formula (2) when the minimum thickness of the head portion 10 is 2.0 mm or more and 3.0 mm or less, it is confirmed that the toothbrush 1 has a high tooth neck cleaning power. It was.

The present invention can be applied to a toothbrush.

1 ... toothbrush, 10 ... head part, 11 ... hair bundle, 12 ... flocked surface, 12a ... flocked hole, 20 ... neck part, 30 ... handle part

Claims

A toothbrush comprising a head part provided with a plurality of flock holes on the flocked surface, and a bristles of hair for use in the flock holes,
The head portion is made of polyacetal resin or polybutylene terephthalate resin,
The minimum thickness of the head part is 2.0 mm or more and 3.0 mm or less,
The maximum width in the short direction of the head part is W1, the total area of the plurality of flocking holes is S, the maximum length of the region where the flocking holes are formed in the longitudinal direction of the head part is L, and the short direction When the maximum width of the region where the flocked hole is formed is W2,
6 <(S / W1) <9
And 3 <(L / W2) <5
A toothbrush characterized by satisfying each of the relationships.
The maximum width of the head portion is 8 mm or less,
The toothbrush according to claim 1, wherein the number of rows of the bristles arranged in the short direction of the head portion is 3 or less.