KR102013966B1 - Bristle for toothbrush, method for manufacturing same, and toothbrush - Google Patents

Abstract

The present invention includes a cylindrical body portion 10 extending from the base end 11 toward the tip end 21 and two or more branching portions 20 protruded from the body portion 10, and the branching portion ( 20 is a toothbrush bristle 1 having a shape that gradually shrinks toward the tip 21, wherein the trunk portion 10 gradually faces toward the branch portion 20 near the branch base end 22. It relates to the toothbrush bristles in which the shaft diameter portion 14 that is reduced in diameter is formed. It is preferable that the cross-sectional shape of the said branch part 20 is a polygon. ADVANTAGE OF THE INVENTION According to this invention, the toothbrush for bristle which is excellent in the cleaning property of a tooth surface, an occlusal surface, and a narrow part, can be manufactured easily, and is excellent in the manufacture ability of a toothbrush.

Description

Toothbrush hair, manufacturing method and toothbrush {BRISTLE FOR TOOTHBRUSH, METHOD FOR MANUFACTURING SAME, AND TOOTHBRUSH}

The present invention relates to a bristle for a toothbrush, a manufacturing method thereof, and a toothbrush.

This application claims priority based on Japanese Patent Application No. 2011-178830 for which it applied to Japan on August 18, 2011, and uses the content here.

A general toothbrush is provided with the handle body which has a handle part, the head part provided in this front-end | tip part, and the hair | bristle bundle which tied two or more toothbrush hairs to the head part, and was planted.

As the hair for a toothbrush, a taper hair whose tip is gradually axially sharpened toward the tip, a straight hair of roughly equal diameter from the base to the tip are known. Especially, since a taper hair can enter narrow parts, such as a cervical part and an interdental part, it is said that it is effective for the prevention of periodontal disease. In addition, since the tip end is flexible, the tapered hair gives a soft touch feeling in the oral cavity.

The taper hair can clean the narrow part satisfactorily, and the touch feeling is soft, but since the hair elasticity is flexible, the taper hair may feel a pity for the actual feeling of cleaning such as a tooth surface or an occlusal surface.

For this problem, a so-called tip branch hair having a tip portion branched is proposed.

For example, a brush has been proposed in which a cross section near the proximal end becomes a three-leaf clover shape, the tip end is branched into three, and each branch hair is tapered (for example, Patent Document 1).

Moreover, bristle fiber which consists of a composite fiber which consists of a skin layer and a core layer of resin which do not adhere | attach each other, and divided | segmented into two or more by grinding | polishing the hair tip is proposed (for example, patent document 2). .

Moreover, for example, it is an island-in-the-sea composite fiber which disperse | distributed 2-5 islands of polyamide resin in the dissection of a polyester resin, and has a composite part which consists of an island and a dissection over a fixed length from a hair base, As for the front side of the figure, it is proposed that only two to five hairs are formed by exposing only the tobu (for example, Patent Document 3).

Or the monofilament for brushes with which the tip was torn by 2 or more is proposed (for example, patent document 4).

Patent Document 1: Japanese Patent Application Laid-Open No. 2001-169827 Patent Document 2: Japanese Patent Application Laid-Open No. 9-98837 Patent Document 3: Japanese Patent Application Laid-Open No. 9-322821 Patent Document 4: Japanese Patent Application Laid-Open No. 2006-207111

However, the invention of Patent Literature 1 has a problem in that when the hair for toothbrush is planted on the woolen surface, it is likely to be torn and damaged by mechanical shock. In particular, when the toothbrush hair is cultivated with a flat hair removal device, there is a problem that the toothbrush hair is likely to be torn when the toothbrush hair is fed to the weaver or when the toothbrush hair is typed on the woolen surface. Invention of patent documents 2-3 has a problem that a manufacturing process is complicated and high cost. Invention of patent document 4 has a problem that it is difficult to control the length and thickness of a branch part.

In addition, the toothbrush hair is required to further improve the cleaning properties of the tooth surface, the occlusal surface and the narrow portion.

Then, an object of this invention is to provide the toothbrush simulation which is excellent in the cleaning property of a tooth surface, an occlusal surface, and a narrow part, can be manufactured easily, and is excellent in the manufacturing ability of a toothbrush.

The toothbrush bristle of the present invention includes a torso-shaped trunk portion extending from the base to the tip, and at least two branching portions addressed to the body portion, wherein the branching portion has a shape that gradually shrinks toward the tip. The trunk portion is characterized in that the shaft diameter portion gradually reduced toward the branch portion is formed near the base end of the branch portion.

It is preferable that the cross-sectional shape of the said branch part is a rough polygon.

The toothbrush of the present invention is characterized in that the toothbrush hair of the present invention is implanted.

The toothbrush simulation method of this invention bundles resin fiber, and makes it into a fiber, and immerses the fiber inside in a solvent at an arbitrary length from the said arbitrary cross section, making arbitrary cross sections of this fiber face vertically downward. The toothbrush simulation method of this invention which has a process characterized by the above-mentioned fiber being provided with the hollow part extended in the longitudinal direction.

That is, this invention relates to the following.

(1) A toothbrush for hair having a circumferential body portion extending from the base end toward the tip, and at least two branching portions addressed to the body portion, wherein the branching portion has a shape that gradually decreases toward the tip portion. , Toothbrush bristles are formed in the vicinity of the proximal end of the branch, the shaft diameter portion is gradually reduced toward the branch,

(2) The cross-sectional shape of the said branch part is a bristle for toothbrushes as described in (1) which is a polygon,

(3) Toothbrushes in which the bristles for toothbrushes of (1) or (2) are implanted;

(4) tying a fiber made of resin into a fiber, and immersing the fiber bundle in a solvent at an arbitrary length from the arbitrary cross section, with the arbitrary cross section of the fiber facing vertically, wherein the fiber The toothbrush simulation method as described in (1) or (2) in which the hollow part extended in the longitudinal direction is formed.

According to the bristle for toothbrush of this invention, it is excellent in the cleaning property of a tooth surface, an occlusal surface, and a narrow part, it can manufacture easily, and it is excellent in the manufacturing ability of a toothbrush.

BRIEF DESCRIPTION OF THE DRAWINGS The front view of the toothbrush simulation which concerns on 1st Embodiment of this invention.
FIG. 2 is a simulated II-II cross-sectional view of the toothbrush of FIG. 1. FIG.
3 is a front view of a fiber which is a simulated material for the toothbrush of FIG. 1.
4 is a cross-sectional view taken along line IV-IV of FIG. 3.
5 is a front view of a toothbrush simulation of a second embodiment of the present invention.
FIG. 6 is a VI-VI cross-sectional view of FIG. 5. FIG.
FIG. 7 is a VIII-VIII cross-sectional view of FIG. 5. FIG.
8A is a mock sectional view of a toothbrush according to an embodiment of the present invention.
8B is a sectional view showing a toothbrush simulation according to one embodiment of the present invention.
9A is a mock sectional view of a toothbrush according to an embodiment of the present invention.
9B is a sectional view showing a toothbrush simulation according to one embodiment of the present invention.

(1st embodiment)

The bristle for toothbrushes which concerns on 1st Embodiment of this invention is demonstrated with reference to drawings below. FIG. 1: is a front view which shows the state in which the hair | bristle for toothbrushes of this embodiment were planted in the hair transplantation surface.

As shown in FIG. 1, the toothbrush hair 1 is provided with the trunk | drum 10 and the three branch parts 20 extended to the trunk | drum 10. As shown in FIG.

The trunk | drum 10 is a cylindrical shape which extends toward the front-end | tip 21 from the base end 11 in the state which the hair | bristle 1 for toothbrushes was planted on the seedling surface 40. FIG.

The said columnar shape is a shape containing the rough columnar shape whose cross-sectional shape orthogonal to a bristle longitudinal direction is a columnar shape of the far-end surface which does not have a corner part (edge) over the whole bristle. The shape of the trunk | drum 10 should just be a columnar shape, and a cylindrical shape is preferable.

The proximal end 11 of the trunk portion 10 is a portion corresponding to the position of the toothbrush head woolen face or both ends of tapered hair for a flat woolen hair, and the tip 21 is the front end of the branch, that is, the tip end. To 0.5 mm (preferably 0.1 mm).

In this embodiment, the trunk | drum 10 is formed in the vicinity of the base end 11, the trunk straight part 12 of the substantially same diameter toward the tip 21 from the base end 11, and the trunk straight part 12 is formed. ), A trunk shaft portion 14 is formed in which the trunk portion 10 is gradually reduced toward the boundary (branch base end) 22 between the trunk portion 10 and the branch portion 20. That is, the trunk | drum 10 of the toothbrush hair 1 of this invention has a trunk | drum straight part 12 and a trunk shaft diameter part.

The toothbrush hair 1 is excellent in the cleaning property of the occlusal surface and the narrow part when the trunk shaft diameter part 14 is formed, and when the whole is bent elastically from the trunk part 10 to the branch part 20. do.

It is said that the diameter of the trunk portion 10 (diameter of the cross section orthogonal to the longitudinal direction of the trunk portion 10) of the shaft portion 10 is the boundary between the trunk portion 10 and the branch portion 20 from the trunk straight portion 12. It means getting thinner (smaller) towards (branch proximal end) 22.

The length L0 of the trunk straight portion 12 can be determined in consideration of the entire length of the hair 1 for a toothbrush.

The thickness of the trunk straight portion 12, that is, the maximum diameter R1 of the trunk portion 10 is determined in consideration of the material and the like, preferably 100 to 300 µm, more preferably 150 to 250 µm. If it is less than the said lower limit, simulation elasticity may become too flexible, and there exists a possibility that the cleaning feeling of a tooth surface, an occlusal surface, etc. may fall. When the said upper limit is exceeded, the cleaning property of a narrow part may fall, or a touch may become hard.

The length L1 of the trunk shaft diameter portion 14 can be determined in consideration of the material and the like in response to the rigidity required for the toothbrush hair 1 and the like, and is, for example, 0.5 to 15 mm. The length L1 of the trunk shaft diameter part 14 is adjusted by the combination of the kind of solvent of the immersion process mentioned later, and immersion time.

 The minimum diameter of the trunk shaft diameter portion 14, that is, the thickness R2 of the trunk portion 10 at the boundary between the trunk portion 10 and the branch portion 20 is, for example, 30 to 99% of R1. It is preferable and 60 to 95% is more preferable. If it is less than the said lower limit, the length L2 of the branch part 20 will become short, and the effect will be hard to be exhibited, and simulation elasticity may be too flexible, and there exists a possibility that the cleaning feeling of a tooth surface, an occlusal surface, etc. may fall. When the said upper limit is exceeded, the cleaning property of a narrow part may fall, or a touch may become hard.

As shown in FIG. 2, the hollow portion 16 extending in the longitudinal direction is formed around the central axis O1 of the trunk portion 10 in the trunk portion 10. In the present embodiment, the cross-sectional shape of the study 16 is a roughly isosceles triangular shape in which a right angle is located near the central axis O1 of the trunk portion 10, and the hollow portion 16 Is annularly arranged around the axis line of the central axis O1. The outline isosceles triangle is a concept in which some or all sides are in the shape of an arc, but each vertex includes a shape in which a corner is cut off by a straight line or a curve.

The central axis O1 connects the proximal end 11 and the branch proximal end 22 of the trunk portion 10, and also has a central cross section of an arbitrary cross section perpendicular to the longitudinal direction of the toothbrush hair 1. It is a line passing through.

The branch portion 20 is gradually reduced in diameter toward the tip 21, and has a so-called tapered shape in which the tip 21 is sharpened. As shown in FIG. 2, the cross-sectional shape of the branch part 20 is a roughly equilateral bilateral triangular shape in which a right angle is located in the vicinity of the central axis O1 of the toothbrush hair 1. The cross-sectional shape of the branched portion 20 approaches the circular shape as it faces the tip 21.

The outer circumferential surface of the branch portion 20 is connected in the same plane as the outer circumferential surface of the trunk portion 10 and the inner circumferential surface of the hollow portion 16, and the hair 1 for a toothbrush is a whole from the proximal end 11 to the distal end 21. It becomes a shape which shrinks gradually toward ().

In the present embodiment, the branch portions 20 are roughly equivalent shapes and approximately equivalent sizes to each other.

The length L2 of the branch 20, that is, the length L2 from the branch base end 22 to the tip 21 can be determined in consideration of the material and the like in response to the rigidity required for the toothbrush hair 1, For example, 0.5-10 mm is preferable and 2-4 mm is more preferable. If it is less than the said lower limit, the cleaning property of a narrow part may fall, or a touch feeling may become hard, and if it exceeds the said upper limit, simulated elasticity may become too flexible, and the cleaning feeling of tooth, an occlusal surface, etc. may fall. The length L2 of the branch part 20 is adjusted by the combination of the kind of solvent of the immersion process mentioned later, and immersion time.

As for the tip diameter of the branch part 20 (diameter of the part which went near 0.1 mm from the tip part 21 to the branch base end 22) (R3), 10-100 micrometers is preferable, for example, 10-60 micrometers Is more preferable. The tip diameter R3 is the diameter of the circle which the cross section perpendicular | vertical with respect to the longitudinal direction of the branch part 20 inscribes.

In the toothbrush hair 1, the trunk portion 10 and the branch portion 20 are integrally molded.

The material of the toothbrush hair 1 is not limited as long as it is generally used as the hair for a toothbrush. For example, polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), or polybutylene terephthalate ( Polyesters such as PBT); Polyamides such as 612 nylon and 610 nylon; Or resins, such as polyolefin, such as polyethylene (PE) or polypropylene (PP), are mentioned, Especially, since processing is easy, polyester is preferable. Although these resin can be used individually by 1 type or in combination of 2 or more types, it is preferable that it is a monofilament which consists of a single material from a viewpoint of the investment cost, maintenance property, or appearance quality stability of a manufacturing facility. .

According to another aspect of the present invention, it is possible to obtain a fiber having a hollow portion by extrusion molding, to bundle the fiber into a fiber, and any cross section (at least one cross section) of the fiber toward the vertical downward direction. It relates to a toothbrush simulation method comprising immersing the fiber bundle in a solvent at an arbitrary length from a cross section.

That is, the manufacturing method of the hair | bristle for toothbrush 1 bundles resin fiber, and makes it into a fiber (inner formation process), and the arbitrary cross section of this fiber is perpendicularly downward, and it is arbitrary length from this arbitrary cross section. The thing which has the process (immersion process) of immersing the said fiber bundle in a solvent is mentioned.

In the core forming step, any number of resin fibers are bundled to obtain a fiber bundle. The number of fibers in the fiber bundle in the genus formation step can be determined in consideration of production efficiency and the like.

The resin fiber 5 used for manufacture of the toothbrush hair 1 for toothbrushes is demonstrated using FIGS. The fiber 5 shown in FIG. 3 becomes the cylindrical shape of substantially the same diameter from one edge part 51 to the other edge part 52, and the three hollow part 16 extended in the longitudinal direction inside is Formed.

The fiber 5 is manufactured by an extrusion molding machine similarly to the manufacturing method of a general hollow bristle, for example. As a manufacturing method by an extrusion molding machine, the method similar to the manufacturing method of the filament of patent document 4 mentioned above is mentioned, for example.

The length of the fiber 5 can be determined in consideration of the length of the target toothbrush hair 1, the hair-planting method, etc., for example, when it is set as the toothbrush hair 1 planted with the flat hair-planting, for example. It is about 25 to 35 mm.

In an immersion process, arbitrary cross sections in a fiber are immersed in a solvent, and the branch part 20 and the trunk shaft diameter part 14 are formed.

The solvent used in the immersion step can be determined depending on the type of the fibers 5, and examples thereof include alkaline solutions such as sodium hydroxide solution or potassium hydroxide solution; Acidic solutions such as sulfuric acid solution; Or an organic solvent etc. are mentioned, Especially, an alkaline solution is preferable and a sodium hydroxide solution is more preferable.

When using sodium hydroxide solution as a solvent, the concentration of sodium hydroxide will be 40-50 mass%, for example.

In addition, the temperature of a sodium hydroxide solution becomes 120-140 degreeC, for example.

The length of the fiber bundle immersed in the solvent can be appropriately determined in consideration of the length of the desired branch 20 and the like.

For example, when the length of the fiber 5 used as the hair | bristle hair 1 for toothbrushes which are planted by a flat tuft is 25-35 mm, the length of the fiber inside immersed in a solvent is 39-25 mm.

When the fiber is immersed in the solvent, the solvent dissolves the outer periphery of the fiber 5, and the fiber 5 is dissolved while the solvent climbs between the fibers 5 and in the hollow 16. Branch 20 and the trunk shaft 14 is formed.

After soaking in the solvent for any time, the fiber bundle is taken out of the solvent, neutralized as desired, and washed with water.

The branch part 20 may be formed only in the one end of the tooth | brush hair 1, and may be formed in both ends.

The hair | bristle hair 1 for toothbrushes obtained in this way are planted on the woolen surface 40 by the flat hair-planting method, or it is planted on the woolen surface 40 by the in-mold method, and it becomes a toothbrush.

According to the bristle for a toothbrush of this embodiment, since the tip is provided with the branch part which was sharpened, narrow parts, such as an interdental part and a cervical part, can be cleaned satisfactorily, and since the trunk part connected to the branch part is thicker than a branch part, it has strong simulation elasticity. The tooth surface and the occlusal surface can be cleaned satisfactorily. In addition, since the trunk shaft diameter portion is formed in the trunk portion, it flexes elastically from the trunk portion to the branch portion, and the narrow portion, the tooth surface and the occlusal surface can be satisfactorily cleaned with a soft touch feeling without causing the hair elasticity to become too hard. .

According to this embodiment, since the trunk | drum is roughly cylindrical, a toothbrush hair can be prevented from being torn by the impact at the time of planting. In particular, in the case of planting with a flat woolen device, it is possible to prevent the toothbrush hair from being damaged when the toothbrush hair is fed to the planter or when the toothbrush hair is typed on the woolen surface.

According to the present embodiment, since the cross section has a roughly triangular cross section, the narrow portion can be cleaned more favorably by scraping the plaque with the ridges forming the vertices of the cross section.

According to this embodiment, the bristles for a toothbrush provided with a tapered branch part can be manufactured by the simple method of immersing a fiber inside in a solvent.

(2nd embodiment)

The bristle for toothbrushes which concerns on 2nd Embodiment of this invention is demonstrated with reference to drawings below. The difference from 1st Embodiment in this embodiment is the quantity of a branch part, and its cross-sectional shape.

As shown in FIG. 5, the toothbrush hair 100 includes a trunk portion 110 and four branch portions 120 spoken to the trunk portion 110.

The trunk | drum 110 is a rough columnar shape which extends toward the front-end | tip 121 from the base end 111 in the state which the hair | bristle 100 for toothbrushes was planted on the seedling surface 40. FIG. In this embodiment, the trunk | drum 110 is formed with the trunk straight part 112 of the substantially same diameter near the base end 111, and continues to the trunk | drum straight part 112 toward the branch base end 122. As shown in FIG. A gradually reduced trunk shaft diameter portion 114 is formed.

As shown in FIGS. 6-7, the hollow part 116 which extends in the longitudinal direction is formed in the trunk | drum 110. As shown to FIG. The hollow part 116 cuts off the trunk | drum 110 in a substantially cylindrical shape. In the trunk portion 110, four branch bases 130 having a substantially cylindrical shape extending in the longitudinal direction of the trunk portion 110 are formed in contact with the inner circumferential surface of the trunk portion 110 around the central axis O2.

The central axis O2 connects the proximal end 111 and the branch proximal end 122 of the trunk portion 110 and passes through the center of an arbitrary cross section perpendicular to the longitudinal direction of the toothbrush hair 100. It is a line.

The branch portion 120 is gradually reduced in diameter toward the tip 121 and has a so-called tapered shape in which the tip 121 is sharpened. As shown in FIG. 6, the cross-sectional shape of the branch part 120 is made into a substantially round shape.

The roughly rounded shape is a polygon, an ellipse or a circle composed only of R having no edges (edges) on the outer circumference. R means a curved surface.

The outer circumferential surface of the branch part 120 is connected in the same plane as the outer circumferential surface of the trunk part 110 and the outer circumferential surface of the branch base 130, and the hair 100 for a toothbrush is the whole from the proximal end 111 to the distal end 121. It becomes a shape which shrinks gradually toward ().

In the present embodiment, the branch portions 120 are substantially equivalent shapes and approximately equivalent sizes to each other.

The length of the trunk straight portion 112 is the same as the length of the trunk straight portion 12, and the thickness of the trunk straight portion 112 is the same as the thickness of the trunk straight portion 12.

The length of the trunk axis diameter part 114 is the same as the length of the trunk axis diameter part 14, and the minimum diameter of the trunk axis diameter part 114 is the same as the minimum diameter of the trunk axis diameter part 14.

The length of the branch part 120 is the same as the length of the branch part 20, and the tip diameter of the branch part 120 is the same as the tip diameter of the branch part 20.

The material of the toothbrush hair 100 is the same as that of the toothbrush hair 1.

According to this embodiment, since the cross section of a branch part is circular, the simulated elasticity of a branch part is flexible, and a feeling which touches becomes softer.

(Other Embodiments)

This invention is not limited to embodiment mentioned above.

In 1st Embodiment, although the cross-sectional shape of a branch part becomes a substantially triangular shape, this invention is not limited to this, The cross-sectional shape of a branch part is circular, such as a round shape or an elliptical shape; Alternatively, coarse polygons may be used other than triangular shapes, such as a rough quadrilateral or a rough fifth triangular.

In 2nd embodiment, although the cross-sectional shape of a branch part becomes a rough round shape, this invention is not limited to this, An oval may be sufficient, and it may be a coarse polygon, such as a coarse triangular, a coarse tetragon, or a coarse pentagon. .

However, it is preferable that the cross-sectional shape of a branch part is polygonal from a viewpoint of improving cleaning property. The polygon is a shape including a rough polygon whose corners are cut straight or curved.

That is, the cross-sectional shape of the toothbrush simulation branch of the present invention is preferably at least one shape selected from the group consisting of a round shape, an ellipse, a triangle, a quadrilateral, and a pentagon. The said triangular shape, a hexagonal shape, and a pentagon shape are shapes containing the rough triangular shape, the rough quadrilateral shape, or the rough 5-fold shape which the edge part cut off by the straight line or the curved line, respectively.

When the cross-sectional shape of a branch part is made into a polygon, the tip diameter R3 is arbitrary which is orthogonal to the longitudinal direction of the toothbrush hair 1 of the part which went near 0.1 mm from the tip part 21 to the base part 22 of the branch part. The area of the cross section.

In the first embodiment, three branch portions are formed, but the present invention is not limited to this, and the number of branch portions may be two or four or more.

Although 4 branch parts are formed in 2nd Embodiment, this invention is not limited to this, The number of branch parts may be 2-3, and may be five or more.

However, from the viewpoint of providing the appropriate simulated elasticity to the branch portions, improving the cleaning properties, and obtaining a soft touch feeling, the number of the branch portions is preferably from 3 to 10, more preferably from 3 to 5.

In the first embodiment, the three hollow portions are formed independently of each other, but the present invention is not limited to this. For example, two or more hollow portions are connected in a region including the central axis, and are radial in the vicinity of the central axis. It may be a cross-sectional shape elongated by a cross, that is, a cruciform shape or a molding.

3-10 are preferable and, as for the number of hollow parts, 3-5 are more preferable.

The bristles for toothbrushes having such hollow portions are described with reference to FIGS. 8A and 8B. FIG. 8A is a sectional view of the same position as in FIG. 2, and FIG. 8B is a sectional view of the trunk portion. FIG. As shown to FIG. 8A or FIG. 8B, the toothbrush hair | bristle 200 is provided with the trunk-shaped body part 210 and four branch parts 220 of a substantially cylindrical shape, and the trunk part 210 is a straight body. The part 212 and the trunk shaft portion 214 is formed.

The cross-sectional shape of the branch part 220 is a substantially triangular shape, and is approaching a circle as it goes to the front-end | tip. The trunk portion 210 is provided with a hollow portion 216 having a substantially cross-sectional shape.

If the hollow part 216 is connected in the area | region containing the center axis | shaft O3 like the toothbrush hair | bristle 200, it will be easy to go to the place where a solvent is deep in an immersion process, and the length of the branch part 220 will be It is preferable at the point which can be lengthened.

The central axis O3 is a line which connects the base end of the trunk part 210 and the branch base end, and passes through the center of the arbitrary cross section which is perpendicular to the longitudinal direction of the toothbrush hair 200.

In the first and second embodiments, the branching portions have substantially the same shape and approximately the same size as each other, but the present invention is not limited to this, and some branching portions and other branching portions have different shapes or sizes. All of the branch portions may be mutually different in shape or size. For example, the cross-sectional shape of a part of branch may be a rough polygon, the cross-sectional shape of a part of branch may be a rough round shape, and the cross-sectional shape of a branch part may be a rough polygon different from each other. For example, the branch may have a cross-sectional shape that is the same as one another, and may have different thicknesses from each other.

Toothbrush bristles in which the size of some branch portions are different from those of other branch portions will be described with reference to FIGS. 9A and 9B. 9A is a cross-sectional view of the same position as in FIG. 2, and FIG. 9B is a cross-sectional view of the trunk portion. As shown to FIG. 9A and FIG. 9B, the toothbrush hair | bristle 300 is the outline cylindrical body part 310, three first branch parts 320, and three second branch parts 322. As shown in FIG. ), The trunk portion 310, the trunk straight portion 312 and the trunk shaft diameter portion 314 is formed.

The cross-sectional shape of the 1st branch part 320 is a rough triangular shape, and is approaching a circle as it goes to the front-end | tip. The cross-sectional shape of the 2nd branch part 322 is a rough triangular shape, and is approaching a circle as it goes to the front-end | tip.

As for the toothbrush hair 300, the cross-sectional shape of the 1st branch part 320 and the cross-sectional shape of the 2nd branch part 322 become substantially equal, and the cross-sectional area of the 1st branch part 320 is 2nd. This is larger than the cross-sectional area of the branching portion 322 of.

In the trunk portion 310, a circular hollow portion 318 having a substantially circular cross-sectional shape is formed in a region including the central axis O4, and is directed from the circular hollow portion 318 to the outer circumferential surface of the trunk portion 310. The rectangular hollow part 319 of the cross-sectional shape extended radially is formed. The trunk portion 310 includes three rectangular hollow portions 319 and three rectangular hollow portions 319 which are adjacent to each other in the circumferential direction of the arbitrary rectangular hollow portions 319 and the trunk portion 310. The first branch base 330 and three second branch bases 332 are formed. As for the 1st branch base 330 and the 2nd branch base 332, cross-sectional shape becomes a substantially triangular shape, and a cross-sectional area is mutually different. The first branch base 330 and the second branch base 332 are alternately located in the circumferential direction of the trunk portion 310.

The first branch portion 320 is approximately the same plane as the outer circumferential surfaces of the first branch base 330 and the trunk portion 310, and the second branch portion 322 is the second branch base 332. And approximately the same as the outer circumferential surface of the trunk portion 310.

The brush 300 for toothbrushes has high cleaning property by the first branch portion 320 of relatively hard wool elasticity, and a feeling of soft contact with the second branch portion 322 of relatively flexible wool elasticity increases.

The central axis O4 is a line which connects the base end of the trunk part 310 and the branch base end, and passes through the center of the arbitrary cross section which is perpendicular to the longitudinal direction of the toothbrush hair 300.

Example

Hereinafter, although an Example is shown and this invention is demonstrated in detail, this invention is not limited by the following description.

(Example 1)

PBT was extruded by extrusion molding, the fiber which has a hollow part was obtained, this fiber was immersed in the solvent (50 mass% sodium hydroxide), and the toothbrush hair like the toothbrush hair 1 of 1st Embodiment was obtained. The obtained toothbrush simulation specification is as showing in Table 1. Since the hair | bristle for toothbrushes is obtained by the method of immersing in a solvent (it describes this processing method as "dissolution" in a table | surface), it was a thing with high manufacturing efficiency.

Subsequently, ten toothbrush hairs were folded into two, so that the number of briquettes per hair bundle was 20, and the toothbrush was obtained by planting in four rows x seven stages. About the obtained toothbrush, hair transplantability, narrow part cleaning property, and surface cleaning property are evaluated, and the result is shown in Table 1. FIG.

(Example 2)

A toothbrush was obtained in the same manner as in Example 1 except that the same as the toothbrush hair, such as the toothbrush hair 100 of the second embodiment. About the toothbrush obtained, a hair-planting aptitude, narrow part cleaning property, and surface cleaning property are evaluated, and the result is shown in Table 1. FIG.

(Comparative Example 1)

PBT was extruded by extrusion molding to obtain a three-leaf clover (multileaf) fiber having a cross-sectional shape, and the fiber was immersed in a solvent (50 mass% sodium hydroxide) to obtain a toothbrush hair like the patent document 1 Obtained the toothbrush in the same manner as in Example 1. About the toothbrush obtained, a hair-planting aptitude, narrow part cleaning property, and surface cleaning property are evaluated, and the result is shown in Table 1. FIG.

(Comparative Example 2)

According to Patent Document 2, a toothbrush was obtained in the same manner as in Example 1 except that the fiber having a skin layer of nylon and a core layer of PBT was polished to obtain a toothbrush. This toothbrush hair was complicated in the point of manufacturing the fiber which consists of two or more layers, and the point of forming a branch part by grinding | polishing (this process method is described as "polishing" in a table | surface). About the obtained toothbrush, hair transplantability, narrow part cleaning property, and surface cleaning property are evaluated, and the result is shown in Table 1. FIG.

(Comparative Example 3)

According to Patent Literature 3, a toothbrush was obtained in the same manner as in Example 1 except that the fiber having the insulated part as nylon and the anatomical part as PBT was used. Since the toothbrush hair manufactures the fiber of the islands-in-sea structure, the manufacturing method was complicated. About the toothbrush obtained, a hair-planting aptitude, narrow part cleaning property, and surface cleaning property are evaluated, and the result is shown in Table 1. FIG.

(Comparative Example 4)

A toothbrush was obtained in the same manner as in Comparative Example 1 except that the cross-sectional shape of the fiber was formed by circularly arranging four circles having a diameter of 60 µm around a circular axis having a diameter of 120 µm (multileaf type). About the toothbrush obtained, a hair-planting aptitude, narrow part cleaning property, and surface cleaning property are evaluated, and the result is shown in Table 1. FIG.

(Comparative Example 5)

According to patent document 4, PBT was extruded by extrusion molding, and six vesicles were formed and the cross-sectional outline was a rough round fiber. One end of this fiber was processed with the rotary blade, and the hair | bristle for toothbrush in which the branch part was formed was obtained (in this table, this processing method is described as "cut"). Using the obtained toothbrush bristles, a toothbrush was obtained in the same manner as in Example 1, and the obtained toothbrush was evaluated for hair dressing aptitude, narrow part cleaning property and surface cleaning property, and the results are shown in Table 1.

(Assessment Methods)

<Plant aptitude>

About the toothbrush of each case, the hair | bristle bristles which were planted were visually observed, and it evaluated "B" that damage was not recognized and "D" that damage was recognized.

<Cleaning part of narrow part>

The oral cavity was cleaned using the toothbrush of each case, and the narrow part cleaning property was evaluated based on the following evaluation criteria.

≪Evaluation Criteria≫

A: I feel the plaque of the cervical neck removed very much.

B: I feel the plaque removed from the cervical area.

C: I do not feel the plaque removed from the cervix very much.

D: I don't feel the plaque removed.

<Cleaning of Cotton>

The oral cavity was cleaned using the toothbrush of each case, and the narrow part cleaning property was evaluated based on the following evaluation criteria.

≪Evaluation Criteria≫

A: I feel the plaque of the tooth surface and occlusal surface removed very much.

B: It feels that the plaque of the tooth surface and occlusal surface was removed.

C: I do not feel the removal of the plaque of the tooth surface and occlusal surface.

D: I do not feel the plaque of the tooth surface and the occlusal surface removed at all.

As shown in Table 1, Examples 1 to 2 to which the present invention was applied had good hair dressing aptitudes, and narrow-area cleaning properties and surface cleaning properties were "B" or "A". In addition, since the hair | bristle for toothbrushes of Examples 1-2 were obtained by processing the fiber which is high in manufacturing efficiency, and consists of a single material, it was the thing which can be manufactured comparatively at low cost.

On the other hand, in Comparative Examples 1 and 4 obtained by processing the multileaf fibers, the apical hair aptitude was "D" because the trunk portion was not a rough round shape.

Since the comparative example 2 used the fiber of a multilayered structure, it polished and formed a branch part, it was a thing with low manufacturing efficiency. In addition, narrow part cleaning property was "C".

In the comparative example 3, since the shape of a branch part was straight, the narrow part cleaning property was "C".

In the comparative example 5, since the shape of a branch part was straight, the narrow part cleaning property was "C".

From the above result, it turned out that the bristle for toothbrushes to which this invention is applied is excellent in the cleaning property of a tooth surface, an occlusal surface, and a narrow part, can be manufactured easily, and the manufacturing ability of a toothbrush is excellent.

[Industry availability]

ADVANTAGE OF THE INVENTION According to this invention, it is possible to provide the toothbrush for a toothbrush which is excellent in the cleaning property of an teeth surface, an occlusal surface, and a narrow part, can be manufactured easily, and is excellent in the manufacturing ability of a toothbrush.

1, 100, 200, 300: Toothbrush
5: fiber
10, 110, 210, 310: Torso
11, 111: air mass
12, 112, 212, 312: body straight portion
14, 114, 214, 314: trunk shaft
16, 116, 216, 316: hollow part
20, 120, 220, 320, 322: branch
21, 121: Tip
22, 122: branch base air mass

Claims (5)

In the toothbrush for hair having a substantially cylindrical body portion extending from the base end toward the tip and a plurality of branching portions addressed to the body portion, wherein the branching portion is gradually reduced in diameter toward the tip end,
The trunk portion is provided with a shaft diameter portion gradually reduced toward the branch portion near the base end of the branch portion,
In the trunk portion, two or more hollow portions extending in the longitudinal direction are formed spaced apart from each other around the central axis of the trunk portion,
In addition, the hollow portion is not formed in the region including the central axis.
The cross-sectional shape orthogonal to the central axis of the hollow portion is a shape in which the width is expanded from the central axis direction toward the outer circumferential surface,
The said branch part protrudes from the area | region between the said hollow parts,
The outer circumferential surface of the branch portion is connected to the outer circumferential surface of the body portion and the same surface as the inner circumferential surface of the hollow portion,
The cross-sectional shape of the base end vicinity of the said branch part is a shape which expands toward the outer peripheral surface from the said central-axis direction, The hair | bristle for toothbrushes characterized by the above-mentioned. The method of claim 1,
The cross section shape of the said hollow part is a toothbrush hair which is a substantially bilateral triangular shape which faces right angle to the central axis of the said trunk | drum. The method according to claim 1 or 2,
The cross-sectional shape of the said branch part becomes circular as it goes to the front-end | tip, and the tip diameter of the said branch part is 10-100 micrometers. The toothbrush of the toothbrush of Claim 1 or 2 is implanted. Claim 1 or 2 which has the process of bundle | bonding resin fiber and making it into a fiber, and immersing the said fiber bundle in an arbitrary length from the said arbitrary cross section to arbitrary cross sections of this fiber in a perpendicular downward direction. As a toothbrush simulation method of description,
In the fiber, at least two hollow portions extending in the longitudinal direction are formed spaced apart from each other around the central axis of the fiber,
In addition, the hollow portion is not formed in the region including the central axis.
The hollow portion has a shape in which a cross-sectional shape orthogonal to the central axis is widened toward the outer circumferential surface from the direction of the central axis of the trunk portion,
The fiber bundle is immersed in the solvent, the solvent dissolves the outer periphery of the fiber, and the fiber dissolves while the solvent climbs between the fibers and in the hollow portion, and the branch portion and the shaft A toothbrush simulation method for forming a neck.

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