TW201733493A - 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

This invention relates to a toothbrush. The present application is based on Japanese Patent Application No. 2016-063573, filed on Jan.

In the toothbrush, in order to improve the operability and to brush the inside of the mouth until every corner, the head may be thinned. Patent Document 1 discloses a toothbrush in which a head is formed by a polyacetal resin or a polybutylene terephthalate resin, and the thickness of the head is set to 2 mm or more and less than 3 mm. This improves the operability in the oral cavity while maintaining sufficient bristles retention strength and head flexural strength. [Prior Art Document] [Patent Literature]

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

[Problems to be Solved by the Invention] In order to remove tartar which is particularly considered to have a large amount of scrubbing residue in the oral cavity, it is important to strongly wash the tooth neck of the cheek side which is particularly difficult to wash in the molars, but the patent The toothbrush disclosed in Document 1 is not sufficient.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a toothbrush which can also strongly wash the tooth neck of the molar. [Means for solving the problem]

According to a first aspect of the present invention, a toothbrush includes a head having a plurality of planting pores disposed on a hair-planting surface, and a tuft of bristles is implanted in the planting pores, wherein: The head portion comprises a polyacetal resin or a polybutylene terephthalate resin, and the minimum thickness of the head portion is 2.0 mm or more and 3.0 mm or less, and the maximum width in the short side direction of the head portion is set to W1, the total area of the plurality of planting pores is set to S, and the maximum length of the region in which the planting pores are formed in the longitudinal direction of the head is set to L, and the short side direction is When the maximum width of the region in which the planting pores are formed is W2, the relationship of 6<(S/W1)<9 and 3<(L/W2)<5 is satisfied.

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 tufts arranged in the short side direction of the head portion is three or less. [Effects of the Invention]

In the present invention, it is also possible to strongly wash the tooth neck of the molar.

Hereinafter, an embodiment of the toothbrush of the present invention will be described with reference to Figs. 1 to 3 . Fig. 1 and Fig. 2 show a toothbrush of this embodiment. 1 is a front view of the toothbrush 1, and FIG. 2 is a plan view showing a hair-growing surface 12 constituting the head portion 10 of the toothbrush 1.

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

The handle body is integrally formed into a long strip shape, and is obtained, for example, by using a resin as a material and by injection molding. Examples of the material of the handle include polypropylene resin (PP), polyacetal resin (Polyoxymethylene (POM)), polystyrene resin (PS), and polyethylene terephthalate. Polyethylene terephthalate (PET), polybutylene terephthalate (PBT), Acrylonitrile Butadiene Styrene (ABS), polyarylate resin, polycarbonate Resin, acrylonitrile-styrene resin (AS), and the like. Among these, a polyacetal resin or a polybutylene terephthalate resin is preferred in terms of high strength and easy thinning of the head. These resins may be used alone or in combination of two or more. Further, in order to improve the grip, a part or all of the handle may be coated with a soft resin such as an elastomer.

As shown in Fig. 2, a plurality of (23 in Fig. 2) planting holes 12a are formed on the hair-planting surface 12 as the surface of the head portion 10, and a tuft 11 is implanted in the planting hole 12a. Three rows of planting holes 12a are arranged in the short side direction of the head 10. The number of rows in the short-side direction of the planting pores 12a is preferably three or less in terms of the insertability into the oral cavity. Further, the maximum width in the short-side direction of the head portion 10 is preferably 8 mm or less in terms of the 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. When the minimum thickness of the head portion 10 is equal to or less than the upper limit value, the operability in the oral cavity of the toothbrush 1 can be improved, and if it is at least the lower limit value, the strength of the head portion 10 can be prevented from decreasing.

As the bristles constituting the tuft 11, the bristles (conical hairs) whose diameter gradually decreases toward the tip of the hair, and the bristles (straight hairs) having substantially the same outer diameter except for the circular portion of the hairlet tip, the hair tips become 篦Shaped, spherical, front-end split shape and other bristles.

Examples of the material of the bristles include polyamine (for example, 6-12 nylon, 6-10 nylon) and polyester (for example, polyethylene terephthalate or polybutylene terephthalate, Synthetic resin materials such as polytrimethylene terephthalate), polyolefin (for example, polypropylene), and elastomer (for example, olefin-based or styrene-based). These resin materials may be used alone or in combination of two or more. Further, the bristles may have a multi-core structure having a core portion and at least one or more sheath portions provided on the outer side of the core portion.

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

The bristles constituting the tufts 11 may all have the same thickness, and two or more bristles having different thicknesses may be combined. Further, in terms of the usability in the oral cavity or the feeling of use, it is preferred that the smaller the diameter of the selected bristles, the shorter the hair length of the bristles. Further, a plurality of bristles having different thicknesses may be used in combination for the purpose of use feeling, brushing feeling, cleaning effect, durability, and the like.

The hair-planting method of the tufts 11 may be a flat-line planting method in which the hair bundles of the bristles are folded in half and the flat line sandwiched between them is inserted into the planting holes 12a, thereby implanting the tufts 11 into the planting holes 12a. It may be a heat-welded planting method in which the tufts 11 are thermally welded to the head portion 10. However, in terms of low cost, a flat-line type hair-planting method is preferred. The flat wire is inserted into the planting hole 12a so as to pass through the center portion of the planting hole 12a and across the planting hole 12a. Examples of the material of the flat wire include metal sheets such as brass and stainless steel, and examples thereof include hard plastics and biodegradable plastics.

In the range of 2.0 mm to 3.0 mm, the minimum thickness of the head portion 10 in the present embodiment is thinner than that of the head of the prior toothbrush, so that the operability in the oral cavity is improved. Further, the head portion 10 is set such that the planting holes 12a are arranged in a lattice shape, and the plurality of planting holes are set when the maximum width of the head portion 10 in the short-side direction (the vertical direction in FIG. 2) is W1. The total area of 12a is set to S, and the maximum length of the region in which the planting hole 12a is formed in the longitudinal direction of the head 10 (the horizontal direction in FIG. 2) is L, and the planting hole is formed in the short-side direction. When the maximum width of the region of 12a is W2, the following formula (1) and the following formula (2) are respectively satisfied. 6<(S/W1)<9 (1) 3<(L/W2)<5 (2)

Further, the length L of the region in which the planting holes 12a are provided in the longitudinal direction is the distance between the outer edges of the outermost planting holes 12a disposed in the longitudinal direction. Similarly, the maximum width W2 of the region in which the planting holes 12a are provided in the short-side direction is the distance between the outer edges of the outermost planting holes 12a in the short-side direction.

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

On the other hand, since the head portion 10 of the present embodiment satisfies the relationship of the above formula (1), the operability of the toothbrush 1 does not decrease, and an appropriate amount of the hair bundle 11 contacts the molar teeth, so that the tooth neck can be strongly washed. unit.

The formula (2) is an appropriate range (a suitable range in which the length in the longitudinal direction of the bundle 11 is arranged) of the length in the longitudinal direction of the unit length in the short-side direction with respect to the region in which the planting pores 12a are formed. When the value of L/W2 is lower than the lower limit value, as in the case of the formula (1), there is a possibility that the region in the longitudinal direction of the hair bundle 11 becomes short, and it is necessary to increase the tooth neck portion of the molar tooth when it is washed. The number of brushing times (the number of round trips of the head 10), or the maximum width W2 is large and the operability is lowered. On the other hand, when the value of L/W2 exceeds the upper limit value, there is a possibility that the region in the longitudinal direction of the hair bundle 11 becomes long and the operability is deteriorated.

On the other hand, since the head portion 10 of the present embodiment satisfies the relationship of the above formula (2), it is possible to prevent the operability of the toothbrush 1 from being lowered, and to set the region in the longitudinal direction of the hair bundle 11 to an appropriate length. Therefore, it is also possible to strongly wash the tooth neck of the molar with a proper number of brushings.

The present invention is not limited to the following examples, and the present invention is not limited thereto, and may be appropriately modified without departing from the spirit and scope of the invention.

(Materials used) <Example 1, Example 2, Comparative Example 1, Comparative Example 3> Handle: Polyacetal resin Toothbrush: Polybutylene terephthalate resin <Example 3> Handle: Poly Pair Butylene phthalate resin toothbrush: Polybutylene terephthalate resin <Comparative Example 2> Handle: Saturated polyester resin Toothbrush: Polyamide (nylon (registered trademark))

(Examples 1 to 3, Comparative Examples 1 to 3) According to the specifications shown in Fig. 3, the handle body was formed by injection molding, and the tufts 11 of the bristles were folded in half and sandwiched in the middle. The thread is inserted into the planting hole 12a, whereby the hair bundle 11 is planted into the planting hole 12a to obtain the toothbrush 1 of each example. The evaluation of each example was carried out for intraoral operability and tooth neck cleaning power. The evaluation of the operability in the oral cavity was set to ◎ very well, and it was set to ○ slightly, the difference was Δ, and the very difference was ×. The evaluation of the tooth neck cleaning force was set to ◎ very high, ○ is slightly higher, Δ is slightly lower, and x is set to very low.

As shown in Fig. 3, when the minimum thickness of the head portion 10 is 2.0 mm or more and 3.0 mm or less, when the head portion 10 satisfies the formula (1), the toothbrush 1 having good oral operability is obtained. In addition, when the minimum thickness of the head 10 is 2.0 mm or more and 3.0 mm or less, when the head 10 satisfies the formula (2), the toothbrush 1 having a high tooth cleaning power is also obtained. [Industrial availability]

The invention is applicable to toothbrushes.

1‧‧‧ toothbrush
10‧‧‧ head
11‧‧‧ hair bundle
12‧‧‧Flocking surface
12a‧‧‧Pore hole
20‧‧‧ neck
30‧‧‧ handle
L‧‧‧ The maximum length of the region in which the hair-growing hole 12a is formed in the longitudinal direction of the head 10 (the left-right direction in Fig. 2)
W1‧‧‧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 in the short-side direction where the hair-growing hole 12a is formed

Fig. 1 is a front view showing a toothbrush according to an embodiment of the present invention. Fig. 2 is a plan view showing a hair-growing surface constituting a head portion of the toothbrush of Fig. 1; 3 is a view showing specifications and evaluations of Examples and Comparative Examples.

10‧‧‧ head

12‧‧‧Flocking surface

12a‧‧‧Pore hole

L‧‧‧ The maximum length of the region in which the hair-growing hole 12a is formed in the longitudinal direction of the head 10 (the left-right direction in Fig. 2)

W1‧‧‧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 in the short-side direction where the hair-growing hole 12a is formed

Claims (2)

A toothbrush comprising a head provided with a plurality of planting pores on a hair-planting surface, and a tuft of bristles is implanted in the planting pores, wherein: the head comprises polyacetal resin or poly The butadiene terephthalate resin, the minimum thickness of the head portion is 2.0 mm or more and 3.0 mm or less, and when the maximum width in the short side direction of the head portion is W1, the plurality of planting pores are The total area is set to S, and the maximum length of the region in which the planting pores are formed in the longitudinal direction of the head is set to L, and the maximum area of the planting pores in the short-side direction is formed. When the width is W2, the relationship of 6<(S/W1)<9 and 3<(L/W2)<5 is satisfied. The toothbrush according to claim 1, wherein the maximum width of the head portion is 8 mm or less, and the number of rows of the tufts arranged in the short side direction of the head portion is 3 or less. .