TWI734760B - Toothbrush - Google Patents

Abstract

The present invention provides a toothbrush including a head portion (10) in which a plurality of bristle implantation holes (12a) is provided on a bristle implantation surface (12), and a bristle implantation bundle is implanted in the bristle implantation hole. The head portion (10) is formed of a polyacetal resin or a polybutylene terephthalate resin. The minimum thickness of the head portion (10) is 2.0 mm to 3.0 mm. When the maximum width in the short side direction of the head portion (10) is W1, the total area of the plurality of the bristle implantation holes (12a) is S, the maximum length of an area in which the bristle implantation holes (12a) are formed in a longitudinal direction of the head portion (10) is L, and the maximum width of the area in which the bristle implantation holes (12a) are formed in the short side direction of the head portion (10) is W2, the relationships of 6＜(S/W1)＜9 and 3＜(L/W2)＜5 are both satisfied.

Description

toothbrush

The present invention relates to a toothbrush.

This application is based on Japanese Patent Application No. 2016-063573 filed in Japan on March 28, 2016 and claims priority, and the content is cited in this application.

In toothbrushes, in order to improve operability and to brush the oral cavity to every corner, the head may be thinned. Patent Document 1 discloses a toothbrush in which a head is formed of polyacetal resin or polybutylene terephthalate resin, and the thickness of the head is set to 2 mm or more and less than 3 mm to improve Operate in the oral cavity, and maintain sufficient bristles holding strength and head bending strength.

[Prior Art Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2011-004852

In order to remove the tartar of the molars in the oral cavity, which is considered to have a lot of residues, it is important to vigorously scrub the teeth and necks of the cheek side of the molars, which are particularly difficult to clean. However, the toothbrush disclosed in Patent Document 1 talks about Not enough.

The present invention is made in consideration of the above-mentioned circumstances, and its purpose is to provide A toothbrush that can also vigorously scrub the necks of molars.

According to a first aspect of the present invention, there is provided a toothbrush, which includes a head with a plurality of pores on the tufted surface, and tufts of toothbrush bristles are implanted in the tufts, characterized in that: The head includes polyacetal resin or polybutylene terephthalate resin, and the minimum thickness of the head is 2.0 mm or more and 3.0 mm or less, when the maximum width in the short-side direction of the head is set as W1, the total area of the plurality of transplanted pores is set to S, the maximum length of the region where the transplanted pores are formed in the longitudinal direction of the head is set to L, and the When the maximum width of the region where the pores are formed is set to W2, the relationships of 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 is 8 mm or less, and the number of rows of the bristle bundles arranged in the short-side direction of the head is 3 rows or less.

In the present invention, the neck of the molars can also be scrubbed vigorously.

1: Toothbrush

10: head

11: Hair Bundle

12: Tufted surface

12a: Pore implantation

20: neck

30: handle

L: The maximum length of the area where the transplanted pores 12a are formed in the longitudinal direction of the head 10 (the left-right direction in FIG. 2)

W1: The maximum width of the short side direction of the head 10 (up and down direction in Figure 2)

W2: The maximum width of the area where the transplanted pores 12a are formed in the short-side direction

Fig. 1 is a diagram showing an embodiment of the present invention, and is a front view of a toothbrush.

Fig. 2 is a plan view showing a tuft surface constituting the head of the toothbrush of Fig. 1.

Hereinafter, the embodiment of the toothbrush of the present invention will be described with reference to FIGS. 1 to 2 instruction.

1 and 2 show the toothbrush of this embodiment. FIG. 1 is a front view of the toothbrush 1, and FIG. 2 is a plan view showing the tuft surface 12 constituting the head 10 of the toothbrush 1. As shown in FIG.

The toothbrush 1 of the present embodiment includes: a head 10 with tufts 11 into which toothbrush bristles are implanted; a neck 20 extending from the base end side of the head 10; and a handle 30 extending from the base end side of the neck 20 Set up (hereinafter, the head 10, the neck 20 and the handle 30 are collectively referred to as the handle body).

The handle body is one that is integrally molded into a long strip, for example, is obtained by injection molding using resin as a material.

As the material of the handle body, include: polypropylene resin (Polypropylene, PP), polyacetal resin (Polyoxymethylene (POM)), polystyrene resin (Polystyrene, PS), polyethylene terephthalate Resin (Polyethylene terephthalate, PET), Polybutylene terephthalate (PBT), Acrylonitrile Butadiene Styrene (ABS), polyarylate resin, polycarbonate Resin, Acrylonitrile Styrene (AS), etc. Among these, a polyacetal resin or a polybutylene terephthalate resin is preferable in terms of high strength and easy thickness reduction of the head.

The resin may be used singly, or two or more of them may be used in combination.

In addition, in order to improve the grip, part or all of the handle body may be covered with a soft resin such as an elastomer.

As shown in FIG. 2, it is formed on the flocking surface 12 as the surface of the head 10 There are multiple (23 in FIG. 2) pores 12a for transplanting pores 12a, and hair bundles 11 are implanted in the pores 12a. Three rows of tufting holes 12a are arranged in the short-side direction of the head 10. The number of rows in the short-side direction of the transplanted pores 12a is preferably 3 rows or less in terms of insertability into the oral cavity. In addition, the maximum width in the short-side direction of the head 10 is preferably 8 mm or less in terms of insertability into the oral cavity.

The minimum thickness of the head 10 is preferably 2.0 mm or more and 3.0 mm or less. If the minimum thickness of the head 10 is less than the upper limit, the operability in the oral cavity of the toothbrush 1 can be improved, and if it is more than the lower limit, the strength of the head 10 can be prevented from decreasing.

As the toothbrush bristles constituting the bristle bundle 11, there can be used: toothbrush bristles (tapered bristles) whose diameter gradually becomes smaller toward the tip of the bristles, toothbrush bristles (straight bristles) with approximately the same outer diameter except for the rounded portion of the tip, and the tip becomes a grate Toothbrush bristles with round, spherical, or split-end toothbrush bristles.

As the material of the toothbrush bristles, for example, polyamide (for example: 6-12 nylon, 6-10 nylon), polyester (for example: polyethylene terephthalate, polybutylene terephthalate, Synthetic resin materials such as polytrimethylene terephthalate), polyolefin (e.g. polypropylene), elastomer (e.g. olefin-based, styrene-based). These resin materials can be used alone or in combination of two or more.

In addition, the toothbrush bristles may have a multiple core structure having a core and at least one or more sheaths provided on the outside of the core.

The cross-sectional shape of the toothbrush bristles is preferably a circular shape, but is not necessarily limited to a circular shape, and can be set to any shape corresponding to the intended use of the toothbrush 1. For example, it can be set as ellipse, polygon (e.g. triangle, quadrilateral, pentagon, hexagon, etc.), special shape (e.g. Such as star shape, three-leaf clover shape, four-leaf clover shape, etc.) and so on.

The toothbrush bristles constituting the bristle bundle 11 may all have the same thickness, or two or more kinds of toothbrush bristles with different thicknesses may be combined. In addition, in terms of usability and usability in the oral cavity, it is preferable that the smaller the diameter of the selected toothbrush bristles, the shorter the hair length of the toothbrush bristles. In addition, it is also possible to combine a plurality of toothbrush bristles with different thicknesses in accordance with the purpose of the usability, the brushing feeling, the cleaning effect, the durability, and the like.

The tufting method of the tufts 11 can be a flat-thread tufting method in which the tufts of toothbrush bristles are folded in half and the flat threads sandwiched between them are driven into the tufting holes 12a, thereby planting the tufts 11 into the tufting holes 12a. It may be a heat-welding type hair transplanting method in which the hair bundle 11 is heat-welded to the head 10, but in terms of low cost, a flat-line type hair transplanting method is preferable. The flat line is punched into the pore 12a by passing through the center of the pore 12a and crossing the pore 12a. As the material of the flat wire, for example, metal sheets such as brass or stainless steel can be cited. In addition to these, rigid plastics or biodegradable plastics can also be cited.

The minimum thickness of the head 10 in this embodiment is in the range of 2.0 mm to 3.0 mm, which is thinner than the head of the conventional toothbrush, and therefore the operability in the oral cavity is improved.

In addition, the head 10 is set in such a way that the transplanted pores 12a are arranged in a grid, and when the maximum width of the short-side direction (up and down direction in FIG. 2) of the head 10 is set to W1, a plurality of transplanted pores The total area of 12a is set to S, the maximum length of the area where the transplanted pores 12a is formed in the longitudinal direction of the head 10 (the left-to-right direction in FIG. 2) is set to L, and the short-side direction is formed with the transplanted pores When the maximum width of the area of 12a is W2, the following formula (1) and the following formula (2) are satisfied, respectively.

6<(S/W1)<9…(1)

3<(L/W2)<5…(2)

In addition, the length L of the area|region provided with the tuft hole 12a in the longitudinal direction is the distance between the outer edges of the tuft hole 12a arrange|positioned at the outermost side in the longitudinal direction. Similarly, the maximum width W2 of the region provided with the tuft hole 12a in the short side direction is the distance between the outer edges of the tuft hole 12a arranged on the outermost side in the short side direction.

The formula (1) represents an appropriate range of the length of the tuft hole 12a (bristle bundle 11) in the long-side direction relative to the unit length of the short-side direction of the head 10 (length of the hair bundle 11). If the value of S/W1 is lower than the lower limit, there is a possibility that the amount of hair tufts 11 in contact with the neck portion of the molar tooth becomes small and it is difficult to wash sufficiently, or the maximum width W1 of the head 10 is large and operability decline. On the other hand, if the value of S/W1 exceeds the upper limit, there is a possibility that the maximum width W1 of the head 10 becomes smaller, or the amount of hair tufts 11 contacting the tooth neck of the molar tooth is in the longitudinal direction If it becomes too much, the operability deteriorates.

On the other hand, since the head 10 of this embodiment satisfies the relationship of the above-mentioned formula (1), the operability of the toothbrush 1 does not decrease, and an appropriate amount of hair tufts 11 contact the molar teeth, so that the neck can be brushed vigorously. Department.

The formula (2) represents an appropriate range of the length in the longitudinal direction with respect to the unit length in the short direction (the appropriate range of the length in the longitudinal direction where the tufts 11 are arranged) with respect to the region where the tuft holes 12a are formed. If the value of I/W2 is lower than the lower limit, as in the formula (1), there is a possibility that the area forming the hair bundle 11 in the longitudinal direction becomes shorter, and it must be increased when scrubbing the neck of the molar tooth Number of brushing (The number of reciprocating movements of the head 10), or the maximum width W2 is large, and the operability is reduced. On the other hand, if the value of L/W2 exceeds the upper limit, there is a possibility that the region forming the hair bundle 11 in the longitudinal direction becomes longer, and the operability deteriorates.

On the other hand, since the head 10 of the present embodiment satisfies the relationship of the above-mentioned formula (2), it is possible to prevent the operability of the toothbrush 1 from deteriorating, and to set the region forming the hair bundle 11 in the longitudinal direction to an appropriate length. Therefore, it is possible to vigorously scrub the tooth neck of the molar tooth with an appropriate number of scrubbing times.

[Example]

Hereinafter, the present invention will be described in detail by showing examples. However, the present invention is not limited to the following examples, and can be implemented with appropriate changes within a range that does not deviate from the gist.

(Use materials)

<Example 1, Example 2, Comparative Example 1, Comparative Example 3>

Handle body: polyacetal resin

Toothbrush bristles: Polybutylene terephthalate resin

<Example 3>

Handle body: polybutylene terephthalate resin

Toothbrush bristles: Polybutylene terephthalate resin

<Comparative Example 2>

Handle body: saturated polyester resin

Toothbrush bristles: Polyamide (nylon (registered trademark))

(Example 1 to Example 3, Comparative Example 1 to Comparative Example 3)

According to the specifications shown in Table 1, the handle body is made by injection molding, and the tuft 11 of the toothbrush bristles is folded in half and the flat line sandwiched in the middle is driven into the burr hole 12a, thereby implanting the tuft 11 to the plant In the pores 12a, the toothbrush 1 of each example was obtained.

The evaluation of each case was performed on the operability in the oral cavity and the cleaning power of the tooth and neck. In the evaluation of the operability in the oral cavity, very good was set to ⊚, slightly better was set to ○, slightly poor was set to △, and very poor was set to ×. In the evaluation of the cleaning power of the tooth neck, very high was set to ⓞ, slightly high was set to ○, slightly low was set to △, and very low was set to ×.

As shown in Table 1, it has been confirmed that when the minimum thickness of the head 10 is 2.0 mm or more and 3.0 mm or less, if the head 10 satisfies the formula (1), it is a toothbrush 1 with good oral operability. In addition, it has been confirmed that when the minimum thickness of the head 10 is 2.0 mm or more and 3.0 mm or less, if the head 10 satisfies the formula (2), it is a toothbrush 1 with a high neck cleaning force.

[Industrial availability]

The present invention can be applied to toothbrushes.

10‧‧‧Head

12‧‧‧Flocking surface

12a‧‧‧Pore-planting

L‧‧‧The maximum length of the area where the pores 12a are formed in the longitudinal direction of the head 10 (the left-right direction in Fig. 2)

W1‧‧‧The maximum width of the short side direction of the head 10 (up and down direction in Figure 2)

W2‧‧‧Maximum width of the area where the transplanted pores 12a are formed in the short-side direction

Claims (2)

A toothbrush, which comprises a head with a plurality of tufts pores arranged on the tufting surface, and tufts of toothbrush bristles are implanted in the tufts, characterized in that the head contains polyacetal resin or polyacetal resin. Butylene terephthalate resin, the minimum thickness of the head is 2.0mm or more and 3.0mm or less, and the pores in the longitudinal direction of the head are 8 rows or less. The maximum width in the short-side direction is set to W1, the total area of the plurality of transplanted pores is set to S, and the maximum length of the region where the transplanted pores are formed in the long-side direction of the head is set to L, When the maximum width of the region in the short-side direction where the pores are formed is W2, the relationships of 6<(S/W1)<9 and 3<(L/W2)<5 are satisfied, respectively. The toothbrush according to claim 1, wherein the maximum width of the head in the short-side direction is 8mm or less, and the rows of the hair bundles arranged in the short-side direction of the head The number is less than 3 columns.

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