KR102183281B1 - Tapered bristles, method for manufacturing same, and toothbrush provided with tapered bristles - Google Patents

Abstract

The tapered bristle assembly, in which 3 or more and 10 or less resin tapered bristle bodies are arranged adjacent to each other having a tapered part at each tip, and the side surfaces of the tapered bristle body are joined and integrated with the sides of the tapered bristle body. It includes a resin-made covering part covering all or part of, and the covering part covers all or part of the side surfaces excluding the tapered part of the tapered bristle body and bonds the side surfaces together, and the tapered part of each tapered bristle body Tapered bristles in which an outer edge portion in the removed portion protrudes outward from the covering portion.

Description

Tapered bristle and its manufacturing method and toothbrush with tapered bristle {TAPERED BRISTLES, METHOD FOR MANUFACTURING SAME, AND TOOTHBRUSH PROVIDED WITH TAPERED BRISTLES}

The present invention relates to a tapered bristle having a structure in which the tip portion is branched, a method of manufacturing the same, and a toothbrush provided with the tapered bristle.

This application claims priority based on Japanese Patent Application No. 2012-211159 for which it applied to Japan on September 25, 2012, and uses the content here.

For the prevention of periodontal disease, a sharpened tapered hair (ultra-fine fine hair) is widely used as a special bristle that has a soft touch feeling at the tip of the hair and can reliably clean the inside of the periodontal pocket. As an example of a sharpened tapered hair, the diameter of the bristles at each portion of 1 mm, 3 mm, 5 mm, and 8 mm from the tapered tip to the tip of a synthetic resin monofilament was 25 to 35%, 55 with respect to the outer diameter of the base of the bristles. A tapered monofilament specified as -70%, 80-90%, and 90-100% is known, and a toothbrush having a structure in which the monofilament is planted at the tip of a toothbrush handle is known.

However, since this type of sharpened tapered hair is very fine, there is a problem that the contact with the gums is weak and the feeling of cleaning is insufficient.

For this reason, for the purpose of improving the cleaning feeling of the sharpened tapered hair, the tip branch hair is being examined. The typical structure is a structure in which bristles having a multi-leaf cross-sectional shape are branched and planted (refer to Patent Document 1), and a structure in which the tip of the bristles is branched like a sea-island structure (refer to Patent Document 2).

The sharpened tapered hair described in Patent Document 1 adopts a structure in which the tip of the cross-sectional clover-shaped bristles is branched in plural, and each tip of the branch hair has a sharp tapered shape, and the hair tip of the branch hair in the tapered shape is accessible to the interdental part. In addition to this excellence, it is a structure capable of suppressing the occurrence of pain in the gums by setting the hair elasticity of one bristle to an appropriate value.

The sharpened tapered hair described in Patent Document 2 is a composite fiber composed of a resin skin layer and a core layer that do not adhere to each other, constitutes the bristles of a toothbrush, and employs a structure in which the hair ends are polished and divided into a plurality, and a narrow gap in the periodontal pocket In addition to being able to easily enter into, it has a structure with a large removal effect of dung.

Japanese Patent Laid-Open No. 2001-169827 Japanese Patent Laid-Open No. Hei 9-98837

The toothbrush described in the preceding Patent Document 1 has excellent interdental cleanability, has a soft touch to the gums, and a high brushing feel, but has a drawback that the cross-sectional clover-shaped bristles are easily cracked at the time of planting or use.

In addition, the toothbrush described in Patent Literature 2 has a drawback in that the branch hairs are denser inside than the bristle tip side outer circumferential position, so that a sufficient feeling of brushing by providing the branch hairs cannot be obtained.

In order to solve the above problems, the present inventors have a tapered bristle and a tapered bristle that has a soft touch to the gums as a tapered hair, has excellent accessibility to the periodontal pocket, has an excellent brushing feel, and is difficult to crack during hair transplantation or use. It is an object of the manufacturing method and the provision of a toothbrush having the tapered bristles.

In order to achieve the above object, the present invention employs the following configuration.

The tapered bristle of the present invention includes a tapered bristle assembly formed by adjacently disposing three or more resin-made tapered bristle bodies with each tip as a tapered portion, and a side surface of the tapered bristle body constituting the tapered bristle assembly. It consists of a resin-made covering portion that is adhered to be bonded and integrally covers the side surfaces of the adjacent tapered bristle bodies, and the covering portion joins the side surfaces of the tapered bristle bodies excluding the tapered portions of the tapered bristle bodies. It characterized in that it is deposited on the side surface of the tapered bristle body so that the outer edge of the side surface of the mother body protrudes outward from the covering portion.

In the tapered bristle of the present invention, the tapered bristle body and the covering portion are made of different resins, the tapered portion of the tapered bristle body is a tapered portion formed by immersion with a solution, and the resin constituting the covering portion is dissolved. A configuration characterized in that the solubility in the liquid is greater than the solubility of the resin constituting the tapered bristle in the dissolved liquid may be adopted.

In the tapered bristle of the present invention, the tapered bristle assembly portion is formed by intimately integrating side surfaces of the three or more tapered bristle bodies at the center side thereof, and the covering portion is a tightly integrated portion of the three or more tapered bristle bodies. It can be configured to be attached to the side of the tapered bristle body so as to cover the side of the.

In the tapered bristle of the present invention, the tapered bristle assembly portion includes a bristle-shaped covering portion covering the three or more adjacent tapered bristle bodies, and the tapered bristle body protrudes its side outer edge from the side of the covering portion. And the remaining portion may be embedded in the bristle-shaped covering portion and provided.

In the tapered bristle of the present invention, the protruding width of the outer edge of the tapered bristle body protruding outward from the covering portion is 5-50% of the diameter of the tapered bristle body, and the protrusion height is 10 of the diameter of the tapered bristle body. It may be -80%.

In the tapered bristle of the present invention, the portion excluding the tapered portion of the tapered bristle assembly may be formed in a substantially petal-shaped cross-section formed by three or more tapered bristle bodies having a polygonal cross-section or an approximately elliptical cross-section.

The toothbrush of the present invention is characterized in that the tapered bristles described in any one of the preceding items are planted in the head.

The method of manufacturing a tapered bristle of the present invention comprises a tapered bristle assembly comprising three or more resin-made tapered bristle bodies having each tip as a tapered portion, and the tapered bristle assembly comprising the tapered bristle assembly. It is made of a resin-made covering portion that covers the adjacent side portions of the tapered bristle body by being integrated with the adjacent side portions of the tapered bristle body, and the covering portion is covered on the side surfaces except the tapered portion of the tapered bristle body, and the tapered bristle body is tapered. As a method for producing a tapered bristles with an outer edge portion of a side surface excluding a portion protruding outward of the covering portion,

In forming a bristle cover by covering a material bristle part in which three or more bristle materials are arranged adjacent to each other with a resin-made coating member, the resin constituting the bristle material and the resin constituting the coating member are either A resin having solubility is used, and a resin having a solubility of the resin constituting the covering member in the solution solution higher than that in the solution solution of the resin constituting the bristle material is used, and After attaching a covering member to form a bristle cover, the bristle cover is immersed in the solution and then pulled up to form a tapered bristle body by forming a tapered portion at the tip of each bristle material, and the tapered portion It is characterized in that the surrounding covering member is dissolved and removed to form a covering portion covering the side surfaces of the tapered bristle body except for the tapered portion.

That is, the present invention relates to the following.

[1] an assembly of tapered bristle bodies in which 3 or more and 10 or less resin tapered bristle bodies having a tapered portion at each tip are arranged adjacent to each other;

And a resin-made covering portion covering all or part of the side surfaces of the tapered bristle body so as to join and integrate the side surfaces of the tapered bristle body,

The covering portion covers all or part of the side surfaces excluding the tapered portion of the tapered bristle body, and the side surfaces are joined together,

Tapered bristles in which an outer edge portion of each tapered bristle body excluding the tapered portion protrudes outward from the covering portion.

[2] the tapered bristle body and the covering portion are made of different resins,

The tapered portion of the tapered bristle body is a tapered portion formed by immersion in a solution,

The tapered bristle according to [1], wherein the solubility of the resin constituting the covering portion in the dissolved solution is greater than the solubility of the resin constituting the tapered bristle body in the dissolved solution.

[3] the tapered bristle assembly portion is configured such that side surfaces of each of the tapered bristle bodies are in close contact and integrated at the center side of the cross section,

The tapered bristle according to [1] or [2], wherein the covering portion covers the side surface of the tightly integrated portion of each of the tapered bristle bodies.

[4] the covering portion is a bristle-shaped covering portion covering each of the adjacently disposed tapered bristle bodies,

The outer edge portion of the tapered bristle body excluding the tapered portion protrudes to the outside of the covering portion,

The tapered bristles according to [1] or [2], wherein a portion of the tapered bristle body excluding the tapered portion, except for the outer edge portion, is embedded in the bristle-shaped covering portion.

[5] The protruding width of the outer edge of the tapered bristle body protruding outward from the covering portion is 5-50% of the diameter of the tapered bristle body, and the protrusion height is 10 to 80% of the diameter of the tapered bristle body. The tapered bristles according to any one of 1] to [4].

[6] The portion of the tapered bristle assembly portion excluding the tapered portion is formed such that three or more and ten or less tapered bristle bodies having a cross-sectional polygonal shape or a cross-sectional oval shape are aggregated around the central axis of the tapered bristle. The tapered bristles according to any one of [1] to [5].

[7] A toothbrush in which the tapered bristles according to any one of [1] to [6] are planted in the head.

[8] a tapered bristle assembly section in which 3 or more, 10 or less resin tapered bristle bodies are arranged adjacent to each other having a tapered part at each tip;

And a resin-made covering portion covering all or part of the side surfaces of the tapered bristle body so as to join and integrate the side surfaces of the tapered bristle body,

The covering portion covers all or part of the side surfaces excluding the tapered portion of the tapered bristle body, and the side surfaces are joined together,

A method of producing a tapered bristle in which an outer edge portion of each of the tapered bristle bodies excluding the tapered portion protrudes outward of the covering portion,

The manufacturing method,

Forming a bristle coating body by covering a material bristle portion in which 3 or more and 10 or less bristle materials are arranged adjacently with a resin-made coating member;

A bristle material having the tapered part by dissolving and removing the covering member around the tapered part while forming a tapered part at the tip of each bristle material by immersing the tip side of the bristle cover in a solution and then pulling it up. Including; forming a covering portion covering the side surface of the base portion excluding the tapered portion of,

delete

The resin constituting the bristle material and the resin constituting the covering member are both resins having solubility in the solution,

A method for producing a tapered bristle having a solubility of the resin constituting the covering member in the solution solution higher than that of the resin constituting the bristle material in the solution solution.

(Effects of the Invention)

According to the present invention, since each tapered bristle body has a tapered portion at the tip end, it has excellent accessibility to the periodontal pocket, and since three or more tapered bristle bodies are integrated by the covering portion, each tapered bristle body is Compared to an independent structure, it is possible to increase the elasticity of the hair, thereby improving the feeling of brushing. In addition, since the covering portion is configured to exclude the tapered portion, the toothpaste can be held in a portion surrounded by the tapered portion at the tip of the covering portion, thereby reliably supplying the active ingredient of the toothpaste to the inside of the periodontal pocket.

In addition, in the case of manufacturing a toothbrush, when the hair is transplanted using a flat wire hair transplanter on the head, it has a structure in which three or more tapered bristle bodies are joined at the covering part, so the hair tip is said to be liable to be cracked during transplantation or use. It is difficult to have problems.

1A is a side view of a toothbrush with tapered bristles, which is an embodiment of the present invention.
1B is a plan view of tapered bristles according to an embodiment of the present invention.
1C is a perspective view of a tapered bristles according to an embodiment of the present invention.
Fig. 2A is a perspective view showing a bristle coating body before dissolution treatment in a method for producing a tapered bristle according to an embodiment of the present invention.
Fig. 2B is a perspective view showing the tapered bristles after a dissolution treatment in a method for producing a tapered bristles according to an embodiment of the present invention.
Fig. 3A is a plan view of tapered bristles according to another embodiment of the present invention.
3B is a perspective view of tapered bristles according to another embodiment of the present invention.
Fig. 4A is a plan view of tapered bristles, which is another embodiment of the present invention.
Fig. 4B is a perspective view of tapered bristles which is another embodiment of the present invention.
Fig. 5A is a plan view of tapered bristles, which is another embodiment of the present invention.
Fig. 5B is a perspective view of a tapered bristles according to another embodiment of the present invention.
Fig. 6A is a plan view of tapered bristles which is another embodiment of the present invention.
Fig. 6B is a perspective view of a tapered bristles according to another embodiment of the present invention.
Fig. 7A is a plan view of tapered bristles which is another embodiment of the present invention.
Fig. 7B is a perspective view of a tapered bristles according to another embodiment of the present invention.

<First embodiment>

Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

Fig. 1A is a view showing a toothbrush A having tapered bristles according to the first embodiment. This toothbrush (A) has a head portion (2) in which a plurality of hair bundles (1) are installed, a hand portion (3), and a grip portion (4), and the head portion (2), the hand portion (3) ), and the gripping portion 4 are made of a hard resin material.

The hard resin constituting the head part 2, the hand part 3, and the holding part 4 can be polypropylene resin or polyester resin, but it is a two-color molded product in which the periphery of these hard resins is covered with a soft resin. You can do it.

Examples of the soft resin include an elastomer resin such as a polyolefin elastomer, a styrene elastomer, or a polyester elastomer.

The resin used here may be any resin applicable to a general toothbrush.

The hair bundle 1 installed in the head portion 2 of the toothbrush A has a tapered bristle 5 described below, for example, with a filling rate of 70 to 95% with respect to the area of the hair growth hole. A plurality of bundles are bundled so as to be, and a bundle of tapered bristles 5 is deformed into a V-shape using a flat line (not shown) and inserted into a hair transplant hole (not shown) in the head portion 2 to be planted. In addition, the method of transplanting the bundles of the tapered bristles 5 to the head part 2 is not limited to the above-described planting structure according to the flat line, and any of the methods of transplanting in a general toothbrush may be used.

The tapered bristle 5 in this embodiment has four tapered bristle bodies 6 made of a resin as enlarged and shown in FIGS. 1B and 1C.

The tapered bristle body 6 is adjacently integrated on the central side of the cross section of the tapered bristle 5, and all or part of the side surfaces of the adjacently integrated portion are covered with a resin-made covering portion 7, respectively.

The tapered bristle body 6 is provided with a tapered portion 6A having a narrowed tip. The portion of the tapered bristle body 6 excluding the tapered portion 6A is the base portion 6B. The base portion 6B has the same arbitrary cross-sectional shape in the axial direction. In addition, "the cross-sectional shape is the same" as used herein may be substantially the same, and for example, even if there is a difference of 0% or more and 15% or less in the area of the cross-section, it is allowed.

The base portion 6B of the tapered bristle body 6 of the present embodiment frame is, for example, of the inner edge portion 6a located on the central side of the tapered bristles 5 in the cross section of the base portion 6B. It is formed in a cross-sectional oval shape in which the width and the width of the outer edge portion 6b positioned on the outer circumference side of the tapered bristles 5 are smaller than the width of the intermediate portion 6c therebetween.

In addition, the "oval shape" in the specification and claims of the present application includes a circle, an oval shape, an ellipse shape, an ellipse, and the like, and it is preferable to have at least one axis of symmetry.

In addition, the "width of the inner edge part 6a" here refers to a virtual circle formed by the outer periphery of the covering part 7 which is the same as the center of the tapered bristles 5, and this virtual circle and the base part Draw an auxiliary line connecting the midpoint of the intersection of the outer edge of (6B) and the center of the tapered bristles 5, and a straight line perpendicular to this auxiliary line at a position 50 to 90 μm away from the center of the tapered bristles 5 It means the maximum value of the distance between the intersections of the outer edge of the base part 6B.

"The width of the outer edge part 6b" is the intersection of the virtual circle formed by the outer periphery of the covering part 7 which is the same as the center of the tapered bristles 5 and the outer edge of the base part 6B. When the auxiliary line is drawn, the portion located outside the auxiliary line of the base 6B (that is, the side opposite to the central side of the tapered bristles 5 with respect to this auxiliary line of the base 6B) It means the maximum value of the distance between the outer edge of [part] and the intersection of an arbitrary straight line parallel to this auxiliary line.

The "width in the middle part 6c" is a virtual circle formed by the outer periphery of the covering part 7 which is the same as the center of the tapered bristles 5, and the virtual circle and the base part 6B are Draw an auxiliary line connecting the midpoint of the intersection of the outer edge and the center of the tapered bristles 5, and at the middle portion 6c between the inner edge 6a and the outer edge 6b are orthogonal to this auxiliary line. When an arbitrary straight line is drawn, it means the maximum value of the distance between the intersection of the line and the outer edge of the base 6B.

In this embodiment, as for the tapered bristle 5, the tapered bristle body 6 is gathered around the central axis of the tapered bristle 5 as shown in FIG. 1C with four base parts 6B, and these are integrated. Thus, the tapered bristle assembly portion 9 is formed, and the side surfaces of the tapered bristle assembly portion 9 are partially covered with the covering portion 7 to form the tapered bristle assembly portion 9. In addition, although only the shape of one end side of the tapered bristle 5 is drawn in FIG. 1C, the other end side of the tapered bristle 5 also forms the tapered part 6A, and is the same shape as FIG. 1C. Therefore, the tapered portion 6A is formed on both ends of the tapered bristle 5 in the longitudinal direction, and the bundle of the tapered bristle 5 is deformed into a V-shape as described above, and the head portion 2 is formed by a flat line. The toothbrush A provided with a plurality of hair bundles 1 having the configuration shown in Fig. 1A can be configured by forming the hair bundle 1 by transplanting the hair.

The bristle diameter (a) of the tapered bristle body 6 (corresponding to a in Fig. 1B) is, in the case of this embodiment, four tapered bristle bodies 6 are aggregated around the central axis of the tapered bristle 5, The distance from the center position in the joined shape to the tip end of the outer edge part 6b of one base part 6B (that is, the center and center of the tapered bristles 5 in the cross section of the tapered bristles 5). Draw a virtual circle constituted by the outer periphery of the covering portion 7 as the same, and an auxiliary line connecting the center of the tapered bristles 5 with the midpoint at the intersection of the virtual circle and the outer edge of the base portion 6B. In this case, it means the distance from the intersection of the auxiliary line and the outer edge of the base part 6B to the center of the tapered bristles 5], the bristles diameter (a) can be about 50 μm to 150 μm. In addition, it is more preferable to select a bristle diameter (a) of about 70 μm to 130 μm.

Further, the length of the tapered portion 6A on the tip side of the tapered bristle 6 (that is, the maximum distance in the longitudinal direction of the tapered portion) is preferably about 0.5 mm to 5.0 mm. In addition, the term ``center of tapered bristles'' here is circumscribed to the outer edge of at least one tapered bristle in the cross-section of the base of the tapered bristles, encompassing all of the cross-section of the base of the tapered bristles, and is virtual to have a minimum radius. It means the center of the virtual circle when a circle is drawn.

In addition, suppose that the diameter of the virtual circle 8 connecting the outermost part of the tapered bristles 6 and the center of the tapered bristles 5 is the bristles diameter b of the tapered bristles 5 (that is, b=2a) , The bristle diameter (b) is preferably in the range of about 100 µm to 300 µm, more preferably in the range of about 150 µm to 250 µm.

In addition, the uppermost end portion of the tapered portion 6A has a rounded shape, and the maximum width in the cross section of the rounded shape to which the rounding is applied is preferably in the range of about 10 µm to 100 µm. The number of tapered bristle bodies 6 for constituting the tapered bristle 5 is not limited to four as in the present embodiment, but is preferably about three to five.

The bristle diameter (b) as the tapered bristles 5 is, as described above, when the number of tapered bristle bodies 6 increases, the tapered bristles 5 need to be thinned by that amount, resulting in weakened hair elasticity, and interdental gaps. Cleanability decreases.

In the four base parts 6B constituting the four tapered bristle bodies 6, the outer side from the part of the inner edge part 6a of the two adjacent base parts 6B to the part of the middle part 6c The covering portion 7 is formed to cover (that is, the side surface). That is, the portion of the intermediate portion 6c from the inner edge portion 6a of the two adjacent base portions 6B corresponds to the adjacent side portions of the base portions 6B, and the covering portion 7 covers the side portions. ) Is formed. Further, the outer circumferential surface of the covering portion 7 is a curved surface so as to constitute a part of the circumferential surface that is the same as the center of the tapered bristle 5, and in the embodiment, the outer peripheral surfaces of the four covering portions 7 are It is preferable that they are arranged so as to constitute the same circumferential surface as shown in 1b.

In the tapered bristle body 6, a portion protruding outward from the covering portion 7 becomes an outer edge portion 6b, and the protruding width W1 of the outer edge portion 6b is formed to be about 10 to 100 μm. Then, the protruding height H1 of the outer edge portion 6b protruding outward from the covering portion 7 is formed to be about 10 to 80 μm.

In addition, the term ``protrusion width'' in the present specification and claims is when an auxiliary line connecting the intersection of the outer edge of the base part and the virtual circle constituted by the outer periphery of the covering part which is the same as the center of the tapered bristles is drawn. The outer edge of the part located outside of this auxiliary line of the negative (that is, the part located on the side opposite to the central side of the tapered bristles with respect to this auxiliary line of the base), and any arbitrary parallel to this auxiliary line. It means the maximum value of the distance connecting the intersections of straight lines.

In the present specification and claims, the term ``protrusion height'' refers to a virtual circle constituted by the outer periphery of the covering portion which is the same as the center of the tapered bristles in the cross section of the tapered bristles, and the intersection of the virtual circle and the outer edge of the base portion When an auxiliary line connecting the center of the tapered bristles and the center of the tapered bristles is drawn, from the distance between the intersection of the auxiliary line and the outer edge of the base part and the center of the tapered bristles, the outer periphery of the covering part is constructed from the center of the tapered bristles. It means the length minus the distance to the outer periphery of the virtual circle.

In addition, the protrusion width (W1) is preferably in the range of 5 to 50% of the bristle diameter (a) of the tapered bristle body 6 because the bristle diameter (a) of the tapered bristle body 6 is about 50 to 150 μm. Do.

In addition, it is preferable that the protrusion height H1 is in the range of 10 to 80% of the bristle diameter (a) of the tapered bristle body 6.

The resin constituting the tapered bristle body 6 and the covering portion 7 is preferably a polyester-based resin from the viewpoint of workability. Further, polyesters such as PET (polyethylene terephthalate), PTT (polytrimethylene terephthalate), PBT (polybutylene terephthalate), and PBN (polybutylene naphthalate); Polyamides such as 612 nylon and 610 nylon; And resins such as polyolefins such as polyethylene (PE) and polypropylene (PP), and among them, polyester is preferable because processing is easy. These resins can be used in combination of two types, but from the viewpoints of investment cost of manufacturing equipment, maintainability, and stability of appearance quality, it is preferable that they are all monofilaments made of a single material. The resin constituting the tapered bristle body 6 and the covering portion 7 is not limited to a monofilament, and may be composed of a multifilament having a multilayer structure.

In addition, in the case of forming the tapered portion 6A on these tapered bristle bodies 6, it may be immersed in a solution and then pulled up and tapered. As the solution in this case, sodium hydroxide or a hydrolysis solution is used. It is preferable to select a resin having a different solubility for the solution.

As an example of the combination in the present embodiment, when the tapered bristle body 6 is formed of (PBT), the covering portion 7 can be formed of (PET). Further, as an example of another combination, when the tapered bristle body 6 is formed of (PBN), the covering portion 7 can be formed of (PBT).

In the case of a toothbrush (A) provided with a tapered bristle 5 shown in FIGS. 1A to 1C, a number of tapered bristle 5 having a configuration including four tapered bristle bodies 6 with a tapered portion 6A are provided. For this reason, the tapered bristle body 6 has excellent accessibility to the periodontal pocket. Therefore, in this embodiment, the toothbrushing property of a periodontal pocket is excellent, and the cleaning feeling is excellent. In addition, in this embodiment, since four tapered bristle bodies 6 are joined together and covered with the covering part 7 and integrated, four tapered bristle bodies 6 are combined into tapered bristle 5, and one by one. It is possible to increase the strength of hair elasticity than a structure having a tapered bristle body in which the tapered bristle body 6 is independently planted, and the brushing feeling of the interdental or tooth bud is excellent.

In the case of using a toothbrush (A) with tapered bristles 5 shown in FIGS. 1A to 1C, it is a space between the four tapered portions 6A, and toothpaste is placed in a portion of the space in front of the tips of the four covering portions 7 Can keep. Therefore, in the present embodiment, there is an effect that the effective ingredient of the toothpaste can be reliably supplied to the deeper portion of the periodontal pocket while holding the toothpaste on the tip side of the tapered bristles 5.

In addition, when the tapered bristles 5 shown in FIGS. 1B to 1C and 2A to 2B are planted, a part of the side surfaces of the four tapered bristle bodies 6 are covered with a covering portion 7 to be constrained. By bending the tapered bristle body 6 by using, there is an effect that when the tapered bristle body 6 is transplanted, the four tapered bristle bodies 6 can be planted while suppressing individual splitting.

In addition, the fear of cracking of the tapered bristles 5 during tooth brushing can be suppressed rather than having a structure in which the periphery of the tapered bristle body 6 is restrained and covered with the covering portion 7 during use of the toothbrush A.

<Manufacturing method>

The tapered bristles 5 of the configuration shown in Figs. 1B and 1C can be manufactured by the method described below as an example.

First, in order to constitute the tapered bristle body 6, the cross-sectional shape of the bristle covering body 10 shown in Fig. 2A is spun by performing two-material spinning of a release type using (PBT) resin and (PET) resin. From this radiator, a cut piece having a cut length of about 25 to 35 mm is used to obtain a bristle covering 10 having a required length. This bristle coat 10 is a material bristle formed by making four bristle materials 11 of cross-section oval-shaped made of (PBT) resin in the present embodiment adjoining so as to gather around the central axis of the bristle coat 10 It is composed of a portion 12 and four covering members 13 made of (PET) resin integrally molded on the side surface of the material bristle portion 12 so as to partially cover the side surface of the material bristle portion 12.

Next, a solution such as an acid or alkali solution is prepared in order to form a tapered portion at the tip of the bristle cover 10, and the one end of the bristle cover 10 is immersed in the solution for a required time to raise, neutralize, and wash with water. The solution treatment is performed through treatment or the like.

As an example of the solution treatment, when a polyester resin is used as the resin constituting the bristle part 12, a solution temperature of 120 to 120 using a heating alkali or a heating acid, preferably 40 to 50% by weight of NaOH aqueous solution as the solution After immersing one end of the bristle covering 10 in the 140°C melting layer, a treatment for pulling up can be performed.

The solution may be determined depending on the resin to be used, and examples thereof include alkali solutions such as potassium hydroxide solution in addition to sodium hydroxide solution, acidic solutions such as sulfuric acid bath, and organic solvents.

After that, it can be set as a tapered bristle cut piece by going through neutralization, water washing, and drying processes.

When the solution concentration or heating temperature of the solution is lower than the above-described conditions, the heating efficiency is lowered, and when the solution concentration or heating temperature of the solution is too high than the above-described conditions, it is difficult to control the sharp processing shape.

For example, when the bristles coating body 10 having the structure shown in Fig. 2A is treated with a solution of the above-described NaOH solution, the solubility of the bristle material 11 made of (PBT) resin is higher than the solubility of the (PET) resin coating member ( Since the solubility of 13) is higher, the tapered portion 6A can be formed at the tip of the bristle material 11, and the covering member 13 existing between the tapered portions 6A can be dissolved and removed. In this way, the tapered bristles 5 of the shape shown in Fig. 2B can be obtained.

As described above, the tapered bristles 5 of the shape shown in Fig. 2B are simultaneously processed by processing the tapered portion 6A and the processing of the covering portion 7 by immersing one end of the bristle coating body 10 in a solution. Can be obtained. This is because the solubility of the resin constituting the covering portion 7 in the dissolved solution is higher than the solubility of the resin constituting the tapered portion 6A in the dissolved solution, and the material and the covering portion constituting the tapered bristle body 6 (7) There is an effect that the structure shown in Fig. 2B can be easily and reliably manufactured by the combination of the material selection of the material constituting (7) and the solution.

<Second Embodiment>

3A to 3B are views showing the tapered bristles 15 according to the second embodiment of the present invention, FIG. 3A is a plan view of the tip portion of the tapered bristles 15, and FIG. 3B is a perspective view of the tapered bristles 15.

The tapered bristles 15 as the second embodiment of the present invention shown in FIGS. 3A to 3B are planted in the hard resin head portion, similarly to the tapered bristles 5 in the first embodiment, to constitute a toothbrush. Used.

In the tapered bristle 15 of this embodiment, as enlarged and shown in FIG. 3B, four tapered bristle bodies 16 made of resin are integrated at the center side of the cross section of the tapered bristle 15, and the tapered bristle assembly part ( 19) is constituted, and all or part of the side surfaces of the integrated portion are covered with resin-made covering portions 17, respectively. The tapered bristle body 16 is formed with a tapered portion 16A having a narrowed tip. The portion of the tapered bristle body 16 excluding the tapered portion 16A is the base portion 16B. The base portion 16B has the same arbitrary cross-sectional shape in the axial direction. In addition, "the cross-sectional shape is the same" as used herein may be substantially the same, and for example, even if there is a difference of 0% or more and 15% or less in the area of the cross-section, it is allowed.

The base portion 16B of the tapered bristle body 16 of the present embodiment is, for example, of the inner edge portion 16a located on the central side of the tapered bristles 15 in the cross section of the base portion 16B. It is formed in a cross-sectional polygonal shape so that the width of the middle portion 16c and the width of the outer edge portion 16b gradually increase sequentially rather than the width.

In addition, in the cross-sectional polygonal shape in the present embodiment, four base portions 16B having a quadrangular cross-section are disposed so as to be integrated at the central portion side of the cross-section of the tapered bristles 15.

In addition, "the width of the inner edge part 16a", "the width of the outer edge part 16b", and "the width of the middle part 16c" referred to herein refer to the "width of the inner edge part 6a", It has the same meaning as "the width of the outer edge part 6b" and "the width of the middle part 6c".

In this embodiment, as for the tapered bristle 15, the tapered bristle body 16 is gathered and integrated around the central axis of the tapered bristle 15, as shown in FIG. 3A with four base parts 16B. Tapered bristles 15 are formed by partially covering the side of the with a covering portion 17. The protruding width of the outer edge portion 16b protruding outward of the covering portion 17 is W2, and the protruding height is H2.

In Fig. 3B, only one end side of the tapered bristle 15 is drawn, but the other end side of the tapered bristle 15 is also formed with a tapered portion 16A to have the same shape as in Fig. 3B. Therefore, the tapered portions 16A are formed on both ends of the tapered bristle 15 in the longitudinal direction, and the bundle of the tapered bristle 15 is deformed into a V-shape, and the toothbrush is planted on the head of the toothbrush by a flat line. Is composed.

The bristle diameter (a) of the tapered bristle body 16 is, in the case of this embodiment, the central position in the shape in which the four tapered bristle bodies 6 are gathered around the central axis of the tapered bristle 15 and joined The distance from the front end of the outer edge portion 16b of one base portion 16B (that is, in the cross section of the tapered bristle 15, the center of the covering portion 17 is the same as the center of the tapered bristle 15). When a virtual circle constituted by the outer periphery is drawn, and an auxiliary line connecting the center of the tapered bristles 15 and the midpoint at the intersection of the virtual circle and the outer edge of the base portion 6B is drawn, this auxiliary line and the base portion It means the distance from the intersection of the outer edge of (16B) to the center of the tapered bristles 5], the bristles diameter (a) can be about 50 μm to 150 μm, and the bristles diameter (a) is It is more preferable to select a range of about 70 μm to 130 μm. In addition, the length of the tapered portion 16A on the tip side of the tapered bristle body 16 (that is, the maximum distance in the longitudinal direction of the tapered portion) is preferably about 0.5 mm to 5.0 mm.

In addition, if the diameter of the virtual circle 18 connecting the center of the tapered bristles 15 with the outermost portions of the four tapered bristles 16 is the bristles diameter b of the tapered bristles 15, the bristles diameter b ) Is preferably in the range of about 100 µm to 300 µm, more preferably in the range of about 150 to 250 µm.

Further, the uppermost end of the tapered portion 16A has a round shape with rounding, and the maximum width in the cross section of the round shape with the rounding is preferably in the range of about 10 µm to 100 µm.

In the tapered bristle 15 shown in Figs. 3A to 3B, similarly to the tapered bristle 5 of the first embodiment, since they are tapered bristle, it is easy to insert the tapered portion 16A into the periodontal pocket. Therefore, the tapered bristle 15 has excellent accessibility to the periodontal pocket, excellent brushing property in the periodontal pocket, and excellent cleaning feeling. Further, in the present embodiment, since the four tapered bristle bodies 16 are integrated to form the tapered bristle 15, the effect of having high hair elasticity strength can be obtained as in the first embodiment. In addition, in this embodiment, the toothpaste can be held in the space between the four tapered portions 16A, and the toothpaste can be supplied to the inner portion of the periodontal pocket as in the previous tapered bristles 5, and when hair transplantation or use There is also an effect of suppressing the cracking of the tapered bristles (15).

In addition, the method of manufacturing the tapered bristles 15 having the structure shown in FIGS. 3A to 3B can be manufactured by a method equivalent to the manufacturing method described based on FIGS. 2A to 2B.

In addition, the number of tapered bristle bodies 16 for constituting the tapered bristle 15 may be appropriately changed as long as it has the effect of the present invention, and may be 2 to 10, for example.

<Third embodiment>

4A to 4B are views showing the tapered bristles 25 according to the third embodiment of the present invention, FIG. 4A is a plan view of the tip portion of the tapered bristles 25, and FIG. 4B is a perspective view of the tapered bristles 25. .

The tapered bristles 25 of the third embodiment shown in Figs. 4A to 4B are used to form a toothbrush by being planted on a hard resin head, similar to the tapered bristles of the first and second embodiments.

In the tapered bristle 25 of this embodiment, as enlarged and shown in FIG. 4A, three tapered bristle bodies 26 made of resin are integrated at the center side of the cross section of the tapered bristle 25, and the tapered bristle assembly part (29) is constituted, and all or part of the side surfaces of the integrated portion are covered with resin-made covering portions 27, respectively.

The tapered bristle body 26 is provided with a tapered portion 26A having a narrowed tip. The portion of the tapered bristle body 26 excluding the tapered portion 26A is the base portion 26B. The base portion 26B has the same arbitrary cross-sectional shape in the axial direction.

In addition, "the cross-sectional shape is the same" as used herein may be substantially the same, and for example, even if there is a difference of 0% or more and 15% or less in the area of the cross-section, it is allowed.

The base portion 26B of the tapered bristle body 26 of the present embodiment is, for example, of the inner edge portion 26a located on the central side of the tapered bristles 25 in the cross section of the base portion 26B. It is formed in a cross-sectional polygonal shape so that the width of the intermediate portion 26c and the width of the outer edge portion 26b are sequentially increased rather than the width. In addition, in the cross-sectional polygonal shape in the present embodiment, three base portions 26B having a quadrangular cross-section are disposed so as to be integrated at the central portion side of the cross-section of the tapered bristles 25.

In addition, the "width of the inner edge portion 26a", "the width of the outer edge portion 26b", and "the width of the middle portion 26c" in the present embodiment means the "width of the inner edge portion 6a" "", "the width of the outer edge part 6b", and "the width of the middle part 6c" have the same meaning.

In the tapered bristle body 26 of this embodiment, the tapered bristle 25 has three base parts 26b, and as shown in FIG. 4A, the tapered bristle body 26 centers on the central axis of the tapered bristle 25. As a result, they are assembled and integrated, and the side surfaces of these are partially covered with the covering portion 27 to form tapered bristles 25.

The protruding width of the outer edge portion 26b protruding outward of the covering portion 27 is W2, and the protruding height is H2.

In addition, although only one end side of the tapered bristle 25 is drawn in FIG. 4A, the other end side of the tapered bristle 25 also forms a tapered part 26A, etc., and has the same shape as FIG. 4B. Therefore, the tapered portions 26A are formed on both ends of the tapered bristle 25 in the longitudinal direction, and the bundle of the tapered bristle 25 is deformed into a V-shape, and the toothbrush is planted on the head of the toothbrush by a flat line. Is composed.

The structure of the tapered bristle 25 shown in Figs. 4A to 4B is 3 instead of the tapered bristle body 16 composed of four base portions 16B provided on the tapered bristle 15 shown in Figs. 3A to 3B. This is an example of the configuration of the two base portions 26B.

The bristle diameter (a) of the tapered bristle body 26 is, in the case of this embodiment, the central position in the shape in which the three tapered bristle bodies 26 are gathered around the central axis of the tapered bristle 25 and joined Distance from the front end of the outer edge portion 26b of one base portion 26B (that is, in the cross section of the tapered bristle 25, the center of the covering portion 27 is equal to the center of the tapered bristle 25). When a virtual circle constituted by the outer periphery is drawn, and an auxiliary line connecting the center of the tapered bristles 25 and the midpoint at the intersection of the virtual circle and the outer edge of the base portion 26B is drawn, this auxiliary line and the base portion It means the distance from the intersection of the outer edge of (26B) to the center of the tapered bristles 25], the bristles diameter (a) can be about 50 μm to 150 μm, and the bristles diameter (a) is It is more preferable to select a range of about 70 μm to 130 μm. Further, the length of the tapered portion 26A on the tip side of the tapered bristle body 26 (that is, the maximum distance in the longitudinal direction of the tapered portion) is preferably about 0.5 mm to 5.0 mm.

In addition, if the diameter of the virtual circle 28 connecting the center of the tapered bristles 25 with the outermost portions of the three tapered bristles 26 is the bristles diameter b of the tapered bristles 25, the bristles diameter b ) Is preferably in the range of about 100 µm to 300 µm, more preferably in the range of about 150 to 250 µm. Further, the uppermost end of the tapered portion 26A has a round shape to which rounding is applied, and the maximum width in the cross section of the round shape to which rounding is applied is preferably in the range of about 10 μm to 100 μm.

In the tapered bristle 25 shown in Figs. 4A to 4B, similarly to the tapered bristle 5 of the first embodiment, since they are tapered bristle, it is easy to insert the tapered portion 26A into the periodontal pocket. Therefore, the tapered bristle 25 has excellent accessibility to the periodontal pocket, and excellent brushing property in the periodontal pocket, and excellent cleaning feeling. In addition, in this embodiment, since the tapered bristle 25 is integrated into the three tapered bristle bodies 26, the effect of high hair elasticity strength can be obtained like the 1st embodiment. In addition, in this embodiment, the toothpaste can be held between the three tapered portions 26A, the toothpaste can be supplied to the inner portion of the periodontal pocket like the previous tapered bristle 5, and the tapered bristle at the time of transplantation. There is also an effect that can suppress cracking.

<Fourth embodiment>

5A-5B are views showing the tapered bristles 35 of the fourth embodiment according to the present invention, FIG. 5A is a plan view of the tip portion of the tapered bristles 35, and FIG. 5B is a perspective view of the tapered bristles 35. .

The tapered bristles 35 of the fourth embodiment shown in Figs. 5A to 5B are planted in the hard resin head portion and used to constitute a toothbrush, similar to the tapered bristles of the previous embodiments 1 to 3.

The structure of the tapered bristle 35 shown in Figs. 5A to 5B is three tapered steels instead of the four tapered bristle bodies 6 provided in the tapered bristle 5 of the first embodiment shown in Figs. 1B to 1C. This is an example in which the mother body 36 is installed.

In the tapered bristle 35 of this embodiment, as enlarged and shown in FIG. 5B, three tapered bristle bodies 36 made of resin are integrated on the central side of the cross section of the tapered bristle 35, and the tapered bristle assembly part (39) is constituted, and all or part of the side surfaces of the integrated portion are covered with resin-made covering portions 37, respectively.

The tapered bristle body 36 is formed with a tapered portion 36A having a narrowed tip. The portion of the tapered bristle body 36 excluding the tapered portion 36A is the base portion 36B. The base portion 36B has the same arbitrary cross-sectional shape in the axial direction.

In addition, "the cross-sectional shape is the same" as referred to herein may be substantially the same, and for example, even if there is a difference of 0% or more and 15% or less in the area of the cross-section, it is allowed.

The base portion 36B of the tapered bristle body 36 of the present embodiment is, for example, of the inner edge portion 36a located on the central side of the tapered bristles 35 in the cross section of the base portion 36B. It is formed in a cross-sectional oval shape formed so that the width of the intermediate portion 36c is larger than the width and the width of the outer edge portion 36b.

In addition, the "width of the inner edge part 36a", "the width of the outer edge part 36b", and "the width of the middle part 36c" in this embodiment means the "width of the inner edge part 6a" "", "the width of the outer edge part 6b", and "the width of the middle part 6c" have the same meaning.

In the tapered bristle body 36 of this embodiment, the tapered bristle body 36 is the central axis of the tapered bristle 35 as shown in FIG. 5A with three outer edge parts 36b of the tapered bristle 35 As a result, they are assembled and integrated, and their side surfaces are partially covered with the covering portion 37 to form tapered bristles 35. The protruding width of the outer edge portion 36b protruding outward of the covering portion 37 is W1, and the protruding height is H1. In addition, although only one end side of the tapered bristle 35 is drawn in FIG. 5B, the other end side of the tapered bristle 35 also forms the taper part 36A, and has the same shape as FIG. 5B. Therefore, the tapered portion 36A is formed on both ends of the tapered bristle 35 in the longitudinal direction, and the bundle of the tapered bristle 35 is deformed into a V-shape, and the toothbrush is planted on the head of the toothbrush by a flat line. Is composed.

The bristle diameter (a) of the tapered bristle body 36 is, in the case of this embodiment, three tapered bristle bodies 36 gathered around the central axis of the tapered bristle 35, and is 1 from the center position of the joined shape. The distance to the front end of the outer edge portion 36b of the base portion 36B of the dog (that is, in the cross section of the tapered bristle 35, on the outer periphery of the covering portion 37 which is the same as the center of the tapered bristle 35 When a virtual circle constituted by the virtual circle is drawn, and an auxiliary line connecting the center of the tapered bristles 35 and the midpoint at the intersection of the virtual circle and the outer edge of the base portion 36B is drawn, this auxiliary line and the base portion 36B ) Means the distance from the intersection of the outer edge of the outer edge to the center of the tapered bristles 35], the bristles diameter (a) can be about 50 μm to 150 μm, and the bristles diameter (a) is 70 μm It is more preferable to select a range of about -130 μm. Further, the length of the tapered portion 36A on the tip side of the tapered bristle body 36 (that is, the maximum distance in the longitudinal direction of the tapered portion) is preferably about 0.5 mm to 5.0 mm.

In addition, if the diameter of the virtual circle 38 connecting the center of the tapered bristles 35 with the outermost portions of the three tapered bristles 36 is the bristles diameter b of the tapered bristles 35, the bristles diameter b ) Is preferably in the range of about 100 µm to 300 µm, more preferably in the range of about 150 to 250 µm.

In addition, the uppermost end of the tapered portion 36A has a round shape to which rounding is applied, and the maximum width in the cross section of the round shape to which rounding is applied is preferably in the range of about 10 μm to 100 μm.

In the tapered bristle 35 shown in Figs. 5A to 5B, similarly to the tapered bristle 5 of the first embodiment, since they are tapered bristle, it is easy to insert the tapered portion 36A into the periodontal pocket. Therefore, in this embodiment, the accessibility to the periodontal pocket is excellent, and the toothbrushing property in the periodontal pocket is excellent, and the cleaning feeling is excellent. In addition, in this embodiment, since the tapered bristle 35 is integrated into the three tapered bristle bodies 36, the effect of high hair elasticity strength can be obtained like 1st Embodiment. In addition, in this embodiment, the toothpaste can be held between the three taper portions 36A, and as in the first embodiment, the toothpaste can be supplied to the inner portion of the periodontal pocket, and the taper bristles are prevented from splitting during transplantation. There is also a suppressive effect.

<Fifth Embodiment>

6A to 6B are views showing the tapered bristles 45 of the fifth embodiment according to the present invention, FIG. 6A is a plan view of the tip portion of the tapered bristles 45, and FIG. 6B is a perspective view of the tapered bristles 45. .

The tapered bristles 45 of the fifth embodiment shown in Figs. 6A to 6B are planted on the hard resin head portion, similarly to the tapered bristles of the previous embodiments 1 to 4, and are used to constitute a toothbrush.

In the tapered bristle 45 of this embodiment, as shown in FIGS. 6A and 6B, the tapered bristle body 46 is adjacently integrated on the central side of the cross section of the tapered bristle 45, and the adjacently integrated portion All or part of the side surfaces are covered with resin-made covering portions 47, respectively. In addition, the covering portion 47 in the present embodiment is a bristle-shaped covering portion.

In addition, the "bristle-shaped covering part" as used herein means a part covered with bristle or the like except for the exposed part so as to partially expose the tapered bristles.

The tapered bristle body 46 is formed with a tapered portion 46A having a narrowed tip. The portion of the tapered bristle body 46 excluding the tapered portion 46A is the base portion 46B. The base portion 46B has the same arbitrary cross-sectional shape in the axial direction.

In addition, "the cross-sectional shape is the same" as used herein may be substantially the same, and for example, even if there is a difference of 0% or more and 15% or less in the area of the cross-section, it is allowed. The base portion 46B is triangular in cross section. In addition, the term "triangular shape" as used herein means a polygon consisting of three points that are not on the same straight line and three line segments connecting them, and the three points are triangular vertices, and the vertex may have a round shape. .

In the base portion 46B, the portion on the bottom side of the triangle is an inner edge portion 46a, and the inner edge portion 46a is disposed in the direction toward the center of the cross section of the tapered bristles 45, The portion on the apex side opposite to the bottom side of the triangle is used as the outer edge portion 46b, and the outer edge portion 46b is disposed in the outer direction in the cross section of the tapered bristles 45. Further, the base portion 46B is buried in the covering portion 47 with the outer edge portion 46b protruding to the outside of the covering portion 47.

The protruding width of the outer edge portion 46b protruding outward of the covering portion 47 is W3, and the protruding height is H3.

In the example of Fig. 6A, tapered bristle bodies 46 are arranged at 90 degree intervals around the inside of the bristle-shaped covering portion 47 having a circular cross section.

Further, the number of tapered bristle bodies 46 for constituting the tapered bristle 45 may be appropriately changed as long as it has the effect of the present invention.

In addition, the arrangement of the tapered bristle bodies 46 may be appropriately changed as long as it has the effect of the present invention, and for example, they may be arranged at equal intervals or at uneven intervals.

In addition, although only one end side of the tapered bristle 45 is drawn in FIG. 6B, the other end side of the tapered bristle 45 also forms a tapered part 46A, etc., and has the same shape as FIG. 6B. Therefore, the tapered portion 46A, etc. are formed on both ends of the tapered bristle 45 in the longitudinal direction, and the bundle of the tapered bristle 45 is deformed into a V-shape, and the toothbrush is planted on the head of the toothbrush by a flat line It is composed.

The bristle diameter (a) of the tapered bristle body 46 corresponds to the distance from the base of the base portion 46B of the triangular cross-section to the apex in each of the four tapered bristle bodies 46 in the case of this embodiment, The bristle diameter (a) may be about 50 μm to 150 μm, and the bristle diameter (a) is more preferably in the range of 70 μm to 130 μm. Further, the length of the tapered portion 46A on the tip side of the tapered bristle body 46 (that is, the maximum distance in the longitudinal direction of the tapered portion) is preferably about 0.5 mm to 5.0 mm.

In addition, suppose that the diameter of the virtual circle 48 connecting the outermost part of each tapered bristle body 46 and the center of the tapered bristle 45 is the bristle diameter (b) of the tapered bristle 45, the bristle diameter (b) Silver is preferably in the range of about 100 µm to 300 µm, and more preferably in the range of about 150 to 250 µm.

Further, the uppermost end of the tapered portion 46A has a round shape to which rounding is applied, and the maximum width in the cross section of the round shape to which the rounding is applied is preferably in the range of about 10 μm to 100 μm.

In the tapered bristle 45 shown in Figs. 6A to 6B, it is easy to insert the tapered portion 46A into the periodontal pocket because it is a tapered bristle similar to the tapered bristle of the previous embodiment. Therefore, in the present embodiment, the accessibility to the periodontal pocket is excellent, and the toothbrushing property in the periodontal pocket is excellent, and the cleaning feeling is excellent. In addition, in this embodiment, since the tapered bristle 45 is integrated with the four tapered bristle bodies 46, the effect of high hair elasticity strength can be obtained like 1st Embodiment. In addition, in this embodiment, since the toothpaste can be held between the four tapered portions 46A, the effect of being able to supply the toothpaste to the inner portion of the periodontal pocket as in the first embodiment, and the tapered bristles during transplantation. There is also an effect that can suppress cracking.

<Sixth embodiment>

7A to 7B are views showing the tapered bristles 55 of the sixth embodiment according to the present invention, FIG. 7A is a perspective view of the tip portion of the tapered bristles 55, and FIG. 7B is a plan view of the tapered bristles 55. .

The tapered bristles 55 of the sixth embodiment shown in Figs. 7A to 7B are planted in the hard resin head portion, similarly to the tapered bristles of the previous embodiments 1 to 5, and are used to constitute a toothbrush.

In the tapered bristle 55 of this embodiment, as shown in Figs. 7A and 7B, the four tapered bristle bodies 56 are adjacently integrated on the central side of the cross section of the tapered bristle 55, and this adjacently integrated portion All or part of the side surfaces of each are covered with a resin-made covering portion 57. In addition, the covering portion 57 in this embodiment is a bristle-shaped covering portion.

In addition, the "bristle-shaped covering part" as used herein means a part covered with bristle or the like except for the exposed part so as to partially expose the tapered bristles.

The tapered bristle body 56 is formed with a tapered portion 56A having a narrow tip. The portion of the tapered bristle body 56 excluding the tapered portion 56A is the base portion 56B. The base portion 56B has the same arbitrary cross-sectional shape in the axial direction.

In addition, "the cross-sectional shape is the same" as used herein may be substantially the same, and for example, even if there is a difference of 0% or more and 15% or less in the area of the cross-section, it is allowed.

The base portion 56B is circular in cross section. In the base portion 56B, the portion in the direction toward the center in the cross section of the tapered bristle 55 in the circle is called the inner edge portion 56a, and the portion on the opposite side is called the outer edge portion 56b. 56B is embedded in the covering portion 57 with the outer edge portion 56b protruding outward from the covering portion 57. The protruding width of the outer edge portion 56b protruding outward of the covering portion 57 is W4, and the protruding height is H4.

In the example of Fig. 7A, tapered bristle bodies 56 are arranged at intervals of 90 degrees around the inside of the bristle-shaped covering portion 57 having a circular cross section.

In addition, the number of tapered bristle bodies 56 for constituting the tapered bristle 55 may be appropriately changed as long as it has the effect of the present invention.

In addition, the arrangement of the tapered bristle body 56 may be appropriately changed as long as it has the effect of the present invention, and for example, it may be arranged at equal intervals or at uneven intervals.

In addition, although only one end side of the tapered bristle 55 is drawn in FIG. 7B, the other end side of the tapered bristle 55 also forms the tapered part 56A, and has the same shape as FIG. 7B. Therefore, the tapered portions 56A are formed on both ends of the tapered bristle 55 in the longitudinal direction, and the bundles of the tapered bristle 55 are deformed into a V-shape and are planted in the head of the toothbrush by a flat line. do.

The bristle diameter (a) of the tapered bristle body 56 corresponds to the diameter of the cross-sectional circular base portion 56B in each of the four tapered bristle bodies 56 in this embodiment, and the bristle diameter (a) The silver can be set to about 50 µm to 150 µm, and it is more preferable to select a range of about 70 µm to 130 µm for the bristle diameter (a). Further, the length of the tapered portion 56A on the tip side of the tapered bristle body 56 (that is, the maximum distance in the longitudinal direction of the tapered portion) is preferably about 0.5 mm to 5.0 mm.

In addition, the diameter of the virtual circle 58 connecting the center of the tapered bristle 55 and the outermost portion of the tapered bristle assembly 59 constituted by the four tapered bristle bodies 56 is the bristles of the tapered bristle 55 As for the diameter (b), the bristle diameter (b) is preferably in the range of about 100 to 300 µm, more preferably in the range of about 150 to 250 µm.

Further, the uppermost end of the tapered portion 56A has a rounded shape, and the maximum width in the cross section of the rounded shape to which the rounding is applied is in the range of about 10 µm to 100 µm.

In the tapered bristle 55 shown in Figs. 7A to 7B, it is easy to insert the tapered portion 56A into the periodontal pocket because it is a tapered bristle similar to the tapered bristle of the previous embodiment. Therefore, in this embodiment, the accessibility to the periodontal pocket is excellent, and the toothbrushing property in the periodontal pocket is excellent, and the cleaning feeling is excellent. In addition, in this embodiment, since the tapered bristle 55 is integrated with the four tapered bristle bodies 56, the effect of high hair elasticity strength can be obtained like 1st Embodiment. In addition, in this embodiment, since the toothpaste can be held between the four tapered portions 56A, the effect of being able to supply toothpaste to the inner portion of the periodontal pocket as in the first embodiment, and to prevent the taper bristles from splitting during transplantation. There is also a suppressive effect.

Example

<Example 1>

It is a tapered bristle of the shape shown in FIGS. 1B to 1C. Specifically, four tapered bristle bodies of cross-sectional oval shape made of PBT resin are joined at the center side of the cross-section of the tapered bristle, and the side surfaces of the four tapered bristle bodies are joined. Tapered bristles having a structure in which a part was covered with a coating layer made of PET resin and each having a tapered portion at both ends in the longitudinal direction was used. The tapered bristles were planted on the head of a toothbrush bundle made of polypropylene resin. The bristle diameter (a) of the tapered bristle body was set to 100 µm, and the length of the tapered portion on the tip side of the tapered bristle body was 2 mm.

Further, the bristle diameter (b) of the tapered bristles 5, which is the diameter of a virtual circle connecting the outermost portion of the four tapered bristles and the center of the tapered bristles, was set to 200 µm. The width of the inner edge portion of the tapered bristle body was 80 mu m, the width W1 of the outer edge portion protruding from the coating layer was 80 mu m, and the protrusion height was 30 mu m.

In addition, about 50% of the side surfaces of the tapered bristle body were covered with a covering body.

A toothbrush of Example 1 for testing was prepared by folding 20 tapered bristle bodies in two so that the number of bristles per hair bundle was 40, and planting them in 4 rows by 7 layers using a flat wire.

<Example 2>

It is a tapered bristle of the shape shown in FIGS. 3A to 3B. Specifically, four tapered bristle bodies having a rectangular cross-section made of PBT resin are joined at the central axis side of the tapered bristle, and a part of the side surfaces of the four tapered bristle bodies is Tapered bristles having a structure covered with a coating layer made of PET resin and having tapered portions at both ends in the longitudinal direction were used. The tapered bristles were planted on a head made of polypropylene resin. The bristle diameter (a) of the tapered bristle body was 90 µm, and the length of the tapered portion on the tip side of the tapered bristle body was 3 mm.

Further, the bristle diameter (b) of the tapered bristles 5, which is the diameter of a virtual circle connecting the outermost portions of the four tapered bristle bodies and the center of the tapered bristles, was set to 190 µm. The width of the inner edge portion of the tapered bristle body is 60 mu m, the width W2 of the outer edge portion protruding from the coating layer is 80 mu m, and the protrusion height H2 is 10 mu m. Further, about 50% of the side surface of the tapered bristle body was covered with a covering portion.

The toothbrush of Example 2 for testing was prepared by folding 20 tapered bristle bodies in two so that the number of bristles per hair bundle was 40, and planting them in 4 rows by 7 layers using a flat wire.

<Examples 3 to 6>

As the tapered bristles of Example 3, Example 4, Example 5, and Example 6, a toothbrush was constructed using the tapered bristles of the configuration shown in Table 1 below. The shape of the tapered bristle of Example 1 and Example 2, the resin type of the tapered bristle body (resin 1), the resin type of the coating layer (resin 2), and bristle diameter so that the description of the tapered bristle of Examples 3 to 6 can be compared. (a) (㎛), bristles diameter (b) (㎛), taper length (mm), inner edge width (W) (㎛), outer edge width (W) (㎛), protrusion height (H) ( Μm), coverage (%), number of bristles (pcs), and sequence (row) are also listed in Table 1 below.

<Comparative Example 1>

As the tapered bristles of Comparative Example 1, a cylindrical body of the same diameter as a virtual circle connecting the outermost part of the tapered bristles of the front cross-section oval-shaped tapered bristles and the center of the tapered bristles, and a taper in which three tapered bifurcations were formed at the tip Made bristles. As described in Patent Literature 1, the tapered bristles are formed by bundling a plurality of filaments each having a three-leaf clover-shaped cross section to form a hair bundle, and then cutting the hair bundle to a predetermined length (about 25 to 35 mm). And the tip portion thereof was prepared by a method of immersing it in a hydrolysis agent such as an aqueous solution of caustic soda.

<Comparative Example 2>

As the tapered bristles of Comparative Example 2, a toothbrush using the fibers for bristle described in Patent Document 2 was produced. As shown in Figs. 5 and 6 of Patent Document 2, a fiber for bristle was spun with a composite resin composed of three polyester core layers having a diameter of 60 µm inside a skin layer made of nylon with an outer diameter of 190 µm. . Both ends of this bristle fiber were each bristle polished to tapered so that the length of the tapered portion became 3 mm, and as shown in Fig. 1 of Patent Document 2, bristles having six tapered bristle portions at the tip portion were obtained. The toothbrush of Comparative Example 2 was constituted by using the same number of bristles as in the previous embodiment, and transplanting them.

<Comparative Example 3>

Although the structure is the same as in Example 1, a tapered bristles having a width (W2) of 10 μm and a height of protrusion (H2) of 1 μm and a width (W2) of the outer edge protruding from the coating layer was prepared, and planted on the head, I got a toothbrush.

<Comparative Example 4>

Although the structure is equivalent to that of Example 1, a tapered bristles having a width (W2) of 130 µm and a protrusion height (H2) of 80 µm of the outer edge protruding from the coating layer was prepared, and planted on the head, I got a toothbrush.

For each of the toothbrushes described above, as appropriate for hair transplantation, the state of shaving, feeling of cleaning teeth, feeling of cleaning gaps, perception of appearance, feeling of contact, and comprehensive evaluation are summarized in Table 2 below.

The evaluation items and evaluation criteria shown in Table 2 are as follows.

<Floating aptitude>

The hair bundles of the bristles were folded in two, and a flat wire was inserted into the return portion, and the hair bundles were planted by inserting them into the hair transplant holes formed in the head. The crack incidence rate of the bristles at that time was measured, and productivity was evaluated based on the following criteria.

A: No cracking occurs (less than 10 ppm cracking occurrence rate)

B: Almost no cracking (cracking occurrence rate of 10 ppm or more and less than 50 ppm)

C: Some cracking occurs (cracking occurrence rate of 50 ppm or more and less than 100 ppm)

D: Cracking occurs (cracking occurrence rate of 100 ppm or more)

<The feeling of cleaning the tooth surface>

Ten monitors cleaned the oral cavity with the toothbrush of each case, and the cleaning effect of the tooth surface at that time was evaluated by the following evaluation criteria. The average score of 10 monitors was 4.0 or more as "A", the average score was 3.0 or more and less than 4.0 points as "B", the average score was 2.0 or more and less than 3.0 points as "C", and the average score was less than 2.0 as "D".

≪Evaluation criteria≫

5 points: The texture of the tooth surface is very dirty.

4 points: The texture of the tooth surface is strongly felt.

3 points: I feel the texture that the dirt on the tooth surface fell off.

2 points: I don't feel the texture that the tooth surface has fallen off very much.

1 point: I do not feel the feeling that the contamination of the tooth surface fell off.

<Experience cleaning the gap>

Ten monitors cleaned the oral cavity with the toothbrush of each case, and the cleaning effect of the gap at that time was evaluated by the following evaluation criteria. The average score of 10 monitors was 4.0 or more as "A", the average score was 3.0 or more and less than 4.0 points as "B", the average score was 2.0 or more and less than 3.0 points as "C", and the average score was less than 2.0 as "D".

≪Evaluation criteria≫

5 points|pieces: The feeling that the contamination of the gap fell off is very felt.

4 points|pieces: The feeling that the contamination of the gap fell off is strongly felt.

3 points|pieces: I feel the feeling that the contamination of the gap fell off.

2 points: I do not feel very much the feeling that the contamination of the gap fell off.

1 point: I do not feel the feeling that the contamination of the gap fell off.

<Appearance recognition>

Ten monitors visually observed the toothbrush of each example, and the discrimination of the shape of the hair tip at that time evaluated the following evaluation criteria. The average score of 10 monitors was 4.0 or more as "A", the average score was 3.0 or more and less than 4.0 points as "B", the average score was 2.0 or more and less than 3.0 points as "C", and the average score was less than 2.0 as "D".

≪Evaluation criteria≫

5 points|pieces: The shape in which the hair tip is branched is very felt.

4 points: Strongly feels the shape in which the hair tip is branched.

3 points: A shape in which the hair tip is branched is felt.

2 points: I do not feel very much the shape where the hair tip is branched.

1 point: It is not felt that the hair tip is branched.

<Touch feeling>

Ten monitors cleaned the oral cavity with the toothbrush of each case, and the feeling of contact with the gum at that time was evaluated by the following evaluation criteria. The average score of 10 monitors was 4.0 or more as "A", the average score was 3.0 or more and less than 4.0 points as "B", the average score was 2.0 or more and less than 3.0 points as "C", and the average score was less than 2.0 as "D".

[Evaluation standard]

5 points: There is no pain in the gums, and the feeling of contact is very good.

4 points: There is no pain in the gums, and the feeling of contact is very good.

3 points: There is no pain in the gums, and the touch feels good.

2 points: I feel mild pain in my gums.

1 point: I feel strong pain in my gums.

<Comprehensive evaluation>

The general evaluation determined from each of the above evaluations is as follows.

A: 2 or more A, the other B

B: 1 or less A and B

C: There is no D, and one of them is C

D: Which one is D

As can be seen clearly from the results shown in Table 2, with respect to the tapered bristles having a structure having a plurality of tapered portions on the tip side of the cylindrical body, the structure of the present invention provides excellent hair removal and excellent tooth surface cleaning power. In addition, it can be seen that the gap cleaning power is also excellent.

This is because the tooth surface cleaning power and the gap cleaning power are improved because the outer edge of the tapered bristle body is projected to the outside of the covering part. Further, it is considered that the protrusion width W of the outer edge portion protruding from the coating layer is appropriate in the range of 20 to 120 µm, and the protrusion height H is in the range of 10 to 70 µm.

In addition, the protruding width (W) of the outer edge portion protruding from the covering layer is preferably in the range of 10% to 30% of the bristles diameter (b), and the outer edge portion 6b protruding outward from the covering portion 7 It is considered that the protrusion height H1 is preferably in the range of 5% to 40% of the bristle diameter b.

(Industrial availability)

According to the present invention, the tapered bristles are tapered bristles, which have a soft touch to the gums, have excellent accessibility to the periodontal pocket, and have an excellent brushing feel, and the bristles are difficult to crack during planting or use, and the tapered bristles and their manufacturing method. It is very useful in industry because it can provide a toothbrush with bristles.

A: Toothbrush 1: Hair bundle
2: head part 5: tapered bristle
6: tapered bristle body 6A: tapered portion
6a: inner edge portion 6B: base portion
6b: outer edge portion 7: covering portion
9: tapered bristle assembly part 15, 25, 35, 45, 55: tapered bristle
16, 26, 36, 46, 56: tapered bristle
16A, 26A, 36A, 46A, 56A: taper part
16a, 26a, 27a, 37a, 47a, 57a: inner edge
16B, 26B, 36B, 46B, 56B: gas part
16b, 26b, 36b, 46b, 56b: outer edge
17, 27, 37, 47, 57: cover part

Claims (8)

A tapered bristle assembly in which 3 or more and 10 or less resin tapered bristle bodies each having a tapered portion at each tip are disposed adjacent to each other around the central axis of the tapered bristle;
And a resin-made covering portion covering all or part of the side surfaces of the tapered bristle body so as to join and integrate the side surfaces of the tapered bristle body,
The covering portion covers all or a part of the side surfaces of the base portion excluding the tapered portion of the tapered bristle body to join adjacent side surfaces of the base portion,
The base portion, in a cross section, has an inner edge portion positioned at the center side of the tapered bristles, an outer edge portion positioned at the outer circumference side of the tapered bristles, and a middle portion formed between the inner edge portion and the outer edge portion. ,
In the adjacent side surfaces of the two base parts, side surfaces of the intermediate part from the inner edge part of the base part are joined by the covering part,
A tapered bristle, characterized in that an outer edge portion of the base portion excluding the tapered portion of each of the tapered bristle bodies protrudes outward from the covering portion. The method of claim 1,
The tapered bristle body and the covering part are made of different resins,
The tapered portion of the tapered bristle body is a tapered portion formed by immersion in a solution,
A tapered bristle, characterized in that the solubility of the resin constituting the covering portion in the dissolved solution is greater than the solubility of the resin constituting the tapered bristle body in the dissolved solution. The method according to claim 1 or 2,
The tapered bristle assembly portion is configured such that side surfaces of each of the tapered bristle bodies are closely integrated and integrated at the center side of the cross section,
The tapered bristle, characterized in that the covering portion covers a side surface of each tapered bristle body in an intimately integrated portion. The method according to claim 1 or 2,
The covering portion is a bristle-shaped covering portion covering each of the adjacently disposed tapered bristle bodies,
The outer edge portion of the tapered bristle body excluding the tapered portion protrudes to the outside of the covering portion,
A tapered bristle, wherein a portion of the tapered bristle body except for the tapered portion is buried in the bristle-shaped covering portion. The method according to claim 1 or 2,
Characterized in that the protruding width of the outer edge of the tapered bristle body protruding outward from the covering portion is 5 to 50% of the diameter of the tapered bristle body, and the protrusion height is 10 to 80% of the diameter of the tapered bristle body Tapered bristles. The method according to claim 1 or 2,
The portion of the tapered bristle assembly portion excluding the tapered portion is formed such that three or more and ten or less tapered bristle bodies having a cross-sectional polygonal shape or a cross-sectional oval shape are aggregated around a central axis of the tapered bristle. Tapered bristles. A toothbrush characterized in that the tapered bristles according to claim 1 or 2 are planted on the head. A tapered bristle assembly in which 3 or more and 10 or less resin tapered bristle bodies each having a tapered portion at each tip are disposed adjacent to each other around the central axis of the tapered bristle;
And a resin-made covering portion covering all or part of the side surfaces of the tapered bristle body so as to join and integrate the side surfaces of the tapered bristle body,
The covering portion covers all or a part of the side surfaces of the base portion excluding the tapered portion of the tapered bristle body to join adjacent side surfaces of the base portion,
The base portion, in a cross section, has an inner edge portion positioned at the center side of the tapered bristles, an outer edge portion positioned at the outer circumference side of the tapered bristles, and a middle portion formed between the inner edge portion and the outer edge portion. ,
In the adjacent side surfaces of the two base parts, side surfaces of the intermediate part from the inner edge part of the base part are joined by the covering part,
A method of producing a tapered bristle in which an outer edge portion of the base portion excluding the tapered portion of each of the tapered bristle bodies protrudes outward from the covering portion,
The manufacturing method,
Forming a bristle coating body by covering a material bristle portion in which 3 or more and 10 or less bristle materials are arranged adjacently with a resin-made coating member;
A bristle material having the tapered part by dissolving and removing the covering member around the tapered part while forming a tapered part at the tip of each bristle material by immersing the tip side of the bristle cover in a solution and then pulling it up. Including; forming a covering portion covering the side surface of the base portion excluding the tapered portion of,
The resin constituting the bristle material and the resin constituting the covering member are both resins having solubility in the solution,
A method for producing tapered bristles, wherein the solubility of the resin constituting the covering member in the solution is greater than the solubility of the resin constituting the bristle material in the solution.

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