JP2009219520A - Toothbrush bristle and toothbrush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide toothbrush bristles which can be highly densely implanted when they are used in a non-flat line toothbrush and which can provide the toothbrush with fine touch and excellent cleaning-properties and the toothbrush at least partly using the bristles. <P>SOLUTION: The toothbrush bristles consist of cut bristles of synthetic resin monofilaments. A section perpendicular to the bristle longitudinal direction has a profiled section form other than a circle. The cut bristles are 10-25 mm in length, which are used in the non-flat line toothbrush. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is capable of implanting a toothbrush bristle with high density when used for a bristle fixing member made of a metal piece, that is, a toothbrush that does not use a flat wire (hereinafter referred to as a non-flat wire toothbrush). The present invention relates to a toothbrush bristle material capable of providing a toothbrush having a touch and touch and a cleaning property, and a toothbrush using the toothbrush bristle material as at least a part of the bristle material.

  As shown in FIGS. 6A to 6C, the conventional toothbrush is formed by bending a toothbrush bristle material 1 to be used in two, and forming a flat piece of metal on a portion of the folded toothbrush bristle material 1 as a valley. A flat-line toothbrush in which the hair 16 is driven and implanted in the flocked hole 11 provided in the head portion 15 of the toothbrush main body 14 is mainly used.

  Since this flat wire toothbrush is in a state where the flat wire 16 is stuck in the member of the head portion 15, the toothbrush bristle material 1 can be firmly fixed to the head portion 15 and can be more easily planted.

  However, in recent years, new performance has been demanded of toothbrushes, and not only the toothbrush bristle material used, but also the toothbrush itself, especially the hair transplantation form of the head part of the toothbrush, has been characterized, and unprecedented new performance is exhibited. The technology is going on.

  Among these techniques, a flat wire toothbrush that does not use a flat wire has attracted particular attention. As shown in FIGS. 7A to 7C, this flat wire toothbrush is planted without bending the toothbrush bristle material into two as in the prior art, and one end of the toothbrush bristle material 1 is connected to the head insert 12. The toothbrush bristle 1 and the head insert 12 are fixed by thermally welding one end of the toothbrush bristle 1 protruding to the opposite side of the head insert 12, Further, the head insert 12 is fixed to the toothbrush main body 14 so that the toothbrush bristle material 1 and the toothbrush main body 14 are integrally molded.

  Therefore, this flat wire toothbrush can be provided with a flocking hole of a shape other than a circle and various sizes, can be combined with several different head inserts and fixed to the toothbrush body, each flocking hole or a head insert There are advantages such that a toothbrush bristle material having a different material and length can be planted, and that the head portion of the toothbrush main body can be designed in a compact manner, making it possible to make a toothbrush rich in variations.

  As a specific manufacturing method, for example, a flocking hole for inserting a toothbrush bristle material is formed through the front and back of an injection mold, and a toothbrush bristle material having a predetermined length is inserted into the flocking hole. After that, the mold cavity is filled with a synthetic resin melt to injection-mold the toothbrush bristle material support, and the toothbrush bristle material inserted through the flocking hole is predetermined from both the front and back surfaces of the bristle material support. A manufacturing method of a toothbrush that is fixed in a state of protruding outward by a length (for example, see Patent Document 1) is already known.

  However, as described above, the flat wire toothbrush has a feature that can change the flocking form of the toothbrush bristle material, but depending on the size of the head part and the thickness of the toothbrush bristle material used, the flocked hole and the head insert The shape and size are also determined, and the variations are not infinite.

  For example, in the case where a large number of bristle materials for toothbrushes are implanted by enlarging the flock holes and the head insert, it is difficult to obtain a toothbrush rich in variations unless the head part itself is enlarged. Conversely, if the flock holes and head inserts are made smaller, it is easy to obtain a variety of toothbrushes, but the number of toothbrush bristle materials that can be flocked to the flock holes is reduced, making the feel unsatisfactory and cleanability. It becomes easy to obtain a low toothbrush. Therefore, if the thickness of the toothbrush bristle material is reduced in order to increase the number of flocks of toothbrush bristle material, the toothbrush bristle material will be weak, and the touch will be unsatisfactory. It becomes easy to obtain.

  Further, a flat wire toothbrush characterized by the toothbrush bristle material used is already known. For example, it is made of a polyester resin and has a non-tapered diameter of 0.1 to 0.2 mm and a taper. Using a toothbrush bristle material in which only one end of the hair having a length of 4 to 8 mm, a taper tip diameter of 0.01 to 0.08 mm, and a total length of 13 to 18 mm is tapered to a taper For the toothbrush that has been planted in such a way that the part of the toothbrush is planted so that the head part of the toothbrush body faces outward, and the non-tapered part of the toothbrush bristle material is heat-sealed and fixed inside the toothbrush head part. There exists a toothbrush (for example, refer patent document 2) whose bristle length is 7-13 mm.

  However, in the above-described flat wire toothbrush using the toothbrush bristle material having a tapered shape, as shown in FIG. 8A, most of the portion appearing from the head insert 12 in the toothbrush bristle material 1 is the taper part 7. For this reason, there are problems such as weakness of the hair, unsatisfactory tactile sensation, and poor cleanability.

In this way, the flat wire toothbrush has infinite possibilities in terms of performance and design, so expectations are increasing year by year, but in order to maximize that possibility, it is necessary to solve the above problems There is. Therefore, there is a great demand for technical improvement of the flat wire toothbrush.
JP 2000-287755 A JP 2007-289725 A

  The present invention has been achieved as a result of studying the solution of the problems in the above-described prior art as an object. That is, the object of the present invention is that when used in a toothbrush that does not use a flat wire (hereinafter referred to as a flat wire toothbrush), the toothbrush bristle material can be planted at high density, and has excellent tactile sensation and cleanability. To provide a toothbrush bristle material capable of providing a toothbrush having the toothbrush and a toothbrush using the toothbrush bristle material as at least a part of the bristle material.

  In order to achieve the above object, according to the present invention, a bristle material for a toothbrush made of a synthetic resin monofilament cut bristle, the cross section perpendicular to the length direction of the cut bristle is an irregular cross sectional shape other than circular. There is provided a toothbrush bristle material characterized in that the length of the cut bristle is in the range of 10 mm to 25 mm.

In the present invention,
The cross-sectional shape of the cut bristle is a polygon having 3 to 8 vertices, or the cross-sectional shape of the cut bristle is a multileaf shape having 3 to 10 convex portions,
A more preferable condition is that the cut bristle has a tapered portion at one end.

  The toothbrush of the present invention is a toothbrush using the toothbrush bristle material of the present invention as at least a part of the bristle material, and the toothbrush bristle material and the toothbrush main body are integrally molded without using a flat wire. Furthermore, the toothbrush bristle material and the toothbrush body are integrally formed through the head insert, and one end of the toothbrush bristle material or one end that is not a tapered portion is inserted into the flock hole provided in the head insert. Then, after fixing the toothbrush bristle and the head insert by thermally welding one end of the toothbrush bristle protruding to the opposite side of the head insert and / or a part of the head insert, the head insert further becomes a toothbrush. It is fixed to the main body.

  The bristle material for toothbrushes of the present invention has an irregular cross-sectional shape such as a polygonal shape or a multi-leaf shape, so that the toothbrush bristle materials are in surface contact with each other and planted at high density when planted. Can do. As a result, when this toothbrush bristle material is used, many toothbrush bristle materials are planted in the flocking hole, so that a toothbrush that is bristle and excellent in tactile sensation is obtained, and further, the apex of the polygonal cross section Since the part which becomes and the part which becomes a convex part of a multi-leaf cross section appears on the bristle material side surface of a toothbrush, the toothbrush excellent in cleaning property is obtained.

  In addition, even when a tapered portion is provided at one end of the toothbrush bristle material, the bristle material for the toothbrush is densely planted, so that a sufficient bristles can be obtained as a whole hair bundle, and excellent in tactile sensation and cleanability. A toothbrush is obtained.

  The toothbrush bristle material and toothbrush of the present invention will be specifically described below with reference to the drawings.

  (A), (b) of FIG. 1 is the perspective view which showed an example of the bristle material for toothbrushes of this invention. As shown in FIG. 1, the toothbrush bristle material of the present invention is characterized in that the cross-section of the toothbrush bristle material 1 is an irregular cross-sectional shape other than a circle.

  Therefore, the toothbrush bristle material 1 of the present invention, as shown in (a) and (b) of FIG. 3, can be implanted at a high density in the flock hole 11 when flocked to a flat wire toothbrush. A toothbrush with a very high cleaning property is obtained.

  That is, as shown in FIGS. 3 (a) and 3 (b), when the toothbrush bristle material 1 having the hexagonal cross section of FIG. 1 (a) is used, the toothbrush bristle materials 1 are side by side. Since they are in contact with each other to form a single bundle, the hair is planted in a high density state, and when the one having the eight-leaf cross section of FIG. Because they are meshed together like gear teeth to form a single bundle, hair is planted in a dense state.

  On the other hand, as shown in FIG. 4, when the toothbrush bristle material 1 having a conventional circular cross section is used, the toothbrush bristle materials 1 are in point contact with each other to form one bundle. Even if the toothbrush bristle material 1 having the same diameter as (a) and (b) of No. 3 is used, it is difficult to implant the hair at a high density, and as a result, a toothbrush having a low cleaning property is easily obtained.

  Moreover, since the bristle material 1 for toothbrushes of the present invention has an irregular cross-sectional shape, the apex or convex portion of the irregular cross-sectional shape appears along the length direction of the bristle material on the side surface of the bristle material 1 for toothbrushes. As a result, since this vertex or convex part works to scrape off dirt on the tooth surface, an even better cleaning effect can be obtained.

  In addition, about the shape of the cross section of the bristle material 1 for toothbrushes of this invention, if it is unusual cross-sectional shape except circular, it will not specifically limit, For example, as shown to (a)-(k) of FIG. In particular, a polygonal shape having 3 to 8 vertices such as a triangle, a rectangle, a rhombus, a pentagon and an octagon, and a multileaf shape having 3 to 10 projections such as a trilobal shape, a hexalobal shape and an octalobal shape are flocked. This is particularly preferable because high-density flocking can be easily obtained.

  Further, when the cross section is a multilobal shape, as shown in FIG. 5, the values of d / D where D and d are the diameters of the circumscribed circle 4 in contact with the convex portion 2 and the inscribed circle 5 in contact with the concave portion 3, respectively. It is preferably in the range of 0.4 to 0.9, particularly 0.5 to 0.8.

  Further, when the intersection points of the intermediate circle 6 having the diameter D and the diameter d, that is, the intermediate circle 6 having the diameter (D + d) / 2, and the multilobal cross section are a1, a2, and a3, the width A (a1 to a2) of the convex portion 2 is obtained. The ratio A / B between the width a2) and the width B of the recess 3 (between a2 and a3) is preferably in the range of 0.5 to 2.0, particularly 0.7 to 1.4.

  That is, by defining the size of the multilobed convex portion 2 and the concave portion 3 as described above, the brush bristle materials 1 can be well meshed with each other, and hair can be implanted at a higher density.

  Here, the bristle material 1 for a toothbrush of the present invention is made of a synthetic resin monofilament cut bristle, but the synthetic resin to be used is not particularly limited. For example, nylon 6, nylon 66, nylon 610 (hereinafter referred to as N610). Nylon 612, Nylon 46, Nylon MDX6, Nylon 11, Nylon 12, or a polyamide resin comprising two or more types of copolymers, polyethylene terephthalate, polybutylene terephthalate (hereinafter referred to as PBT), polyethylene naphthalate , Polypropylene terephthalate, polymethylene naphthalate, polybutylene naphthalate, polypropylene naphthalate or a polyester resin comprising two or more of these copolymers, polyphenylene sulfide, polyvinylidene fluoride, polyethylene Rene / tetrafluoroethylene copolymer, polytetrafluoroethylene, tetrafluoroethylene / hexafluoropropylene copolymer, polytetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene / vinylidene fluoride copolymer, tetra Fluoroethylene / hexafluoropropylene / vinylidene fluoride copolymer, polychlorotrifluoroethylene, ethylene chloride / tetrafluoroethylene copolymer, fluororesin such as fluorovinyl ether, and polyolefin resin such as polyethylene and polypropylene. Further, those obtained by blending two or more of these resins can also be used.

  In particular, the bristle material for toothbrushes of the present invention is preferably a polyamide resin, a polyester resin, or a fluorine resin among the above synthetic resins, and further has excellent chemical / physical properties. Or use of PBT is more preferable.

  In addition to the particles such as various inorganic particles, various metal particles, and cross-linked polymer particles, the above-mentioned synthetic resin may be a known antioxidant as long as it does not inhibit the effects of the present invention. Agents, light-proofing agents, anti-glare agents, ion-exchange agents, anti-coloring agents, anti-static agents, various coloring agents, waxes, silicone oils, various surfactants, various reinforcing fibers, etc. is there.

  The flat wire toothbrush is a bristle fixing member made of a metal piece like a conventional toothbrush, that is, a toothbrush that does not use a flat wire, and the bristle material 1 for a toothbrush of the present invention is used for this flat wire toothbrush. Therefore, as shown in FIG. 7, the toothbrush bristle used for the flat wire toothbrush is not bent and planted in two, unlike the conventional toothbrush (FIG. 6). The length of the bristle material 1 is shorter than the conventional bristle material for toothbrushes.

  However, if the length is too short, it becomes difficult to be fused and fixed to the head insert 12, so that problems such as easy removal of the toothbrush bristle material 1 are likely to occur. Therefore, there is a problem that it takes time and effort in the manufacturing process of the toothbrush.

  Therefore, the bristle material 1 for toothbrushes of the present invention needs to have a length in the range of 10 to 25 mm, and more preferably in the range of 10 to 20 mm.

  Moreover, the diameter of the bristle material 1 for toothbrushes of this invention can be suitably selected according to the kind and function of a toothbrush, and is not specifically limited. However, if it is too thin, high-density flocking will be easier, but the hair will be too soft and the touch will be unsatisfactory. It becomes easy to become a toothbrush with inferior tactile sensation due to not only lowering but also stiff fur. Therefore, the diameter of the bristle material 1 for toothbrushes of the present invention is preferably in the range of 0.05 to 0.25 mm, and more preferably in the range of 0.10 to 0.22 mm.

  Furthermore, it is more preferable that the bristle material for toothbrushes of the present invention has a tapered portion at one end because a toothbrush having excellent cleaning properties for removing dirt between teeth can be obtained.

  When a toothbrush bristle with a circular section having a tapered portion at one end is used for a flat wire toothbrush, most of the toothbrush bristle 1 appearing from the head insert 12 is soft as shown in FIG. The tapered portion 7 is obtained. For this reason, the toothbrush shown in FIG. 8 (a) has a weak bristle and is unsatisfactory in tactile sensation, and tends to be a toothbrush with low cleanability.

  However, as shown in FIG. 8 (b), when using the toothbrush bristle material of the present invention, since the high-density flocking can be performed, the toothbrush bristle materials firmly adhere to each other at the root, and as a result, Appropriate hardness is maintained throughout the toothbrush.

  Therefore, when the toothbrush bristle material of the present invention is used, not only a sufficient tactile sensation is obtained, but also a large number of tip portions 8 appear on the surface as compared with FIG. Dirt can be removed efficiently.

  In addition to phosphate-based, zeolite-based, and hydroxyapatite-based antibacterial agents in which silver ions are supported on the surface and / or inside of the brush hair material 1 of the present invention, zinc oxide, zinc sulfate, zinc chloride, phosphorus Zinc compounds such as zinc oxide, zinc nitrate, zinc carbonate, zinc acetate, zinc oxalate, zinc citrate, zinc fumarate, zinc formate, cationic antibacterial agents such as benzethonium, benzalkonium, cetylpyridium, chlorhexidine, epi Photocatalysts such as tea catechins such as gallocatechin, epigallocatechin gallate, epicatechin, and epicatechin gallate, anatase type or rutile type titanium dioxide can be attached and / or contained to impart an antibacterial effect.

  Next, the manufacturing method of the bristle material for toothbrushes of this invention is demonstrated.

  First, it is not necessary to use any special method for the production method of the monofilament to be used as the toothbrush bristle material of the present invention. For example, it can be produced using a known melt spinning method.

  Specifically, when PBT is used as a synthetic resin, PBT pellets that have been dried in advance are supplied to a single-screw extruder melt spinning machine, and the PBT is melted and kneaded in the melt spinning machine and extruded into a melt pack. The melted PBT is spun from the hole of the base attached to the pack. At this time, the shape of the hole of the mouthpiece matches that of the toothbrush bristle material of the present invention.

  Next, the spun PBT is cooled and solidified in a cooling bath, subsequently stretched and heat-set in a high-temperature medium, and then wound with an oil. The wound PBT monofilament is cut to a desired length to form a cut bristle.

  Here, in the case where a tapered portion is provided at one end of the cut bristle, a method of forming the end of the obtained cut bristle by mechanical polishing or chemical treatment with an acid or alkali solution is employed.

  The toothbrush bristle material thus manufactured is used for at least a part of the bristle wire brush material, and the method of flocking is one of the toothbrush bristle materials without using a flat wire like a conventional toothbrush. A method is adopted in which part of the toothbrush and / or part of the toothbrush body is heated and fixed by welding, and the toothbrush bristle material and the toothbrush body are integrally molded.

  Further, when the head insert is used, as shown in FIG. 7, after inserting one end of the bristle material 1 for toothbrush or one end which is not a tapered portion into the flock hole 11 provided in the head insert 12, After fixing the toothbrush bristle material 1 and the head insert 12 by thermally welding one end of the toothbrush bristle material 1 protruding to the opposite side of the head 12 and / or a part of the head insert 12, the head insert 12 is A method in which the toothbrush body 14 is fixed and integrally molded is employed.

In addition, when the bristle material for toothbrushes of the present invention is used for a flat wire toothbrush, the flocking density is preferably 20 / mm ² or more, and more preferably 25 or more. This is because when the flocking density falls below the above range, the tactile sensation becomes unsatisfactory, and a toothbrush lacking in cleanability is easily obtained.

  The flat wire toothbrush manufactured using the toothbrush bristle material of the present invention as described above is tactile as compared with the conventional flat wire toothbrush because the toothbrush bristle material is densely planted. An excellent toothbrush. Moreover, since the cross-section of the bristle material for toothbrushes of the present invention has an irregular cross-sectional shape, the apex or convex portion of the irregular cross-sectional shape appears along the length direction of the bristle material on the side surface of the bristle material for toothbrushes. As a result, since this apex or projection functions to scrape off dirt on the tooth surface, a remarkable effect of further improving the cleaning performance by high-density flocking can be obtained.

  In addition, this effect is particularly prominent when a toothbrush bristle material having a tapered portion at one end is used. Since the length of the toothbrush bristle used in the flat wire toothbrush is short, most of the toothbrush bristle that emerges from the flock hole becomes a tapered portion when flocked. The toothbrush bristle material having the taper portion is softer than the toothbrush bristle material having no taper portion. Therefore, when it is used for a flat wire toothbrush, the softness of the hair and hips appears remarkably, and it is easy to become a toothbrush not only having an unsatisfactory touch but also having a low cleaning property.

  However, when the toothbrush bristle material of the present invention is used, high-density flocking is possible, so each toothbrush bristle material has a soft bristles, but the entire bundle that has been flocked has sufficient hardness. As a result, sufficient tactile sensation is obtained.

  In addition, as a result of the high-density flocking, many tips of the tapered portion appear on the surface, and an effect of efficiently removing dirt between teeth can be obtained. This effect is an advantageous effect that cannot be obtained with a conventional toothbrush bristle material having a circular cross section.

  Further, the toothbrush bristle material having an irregular cross-sectional shape is difficult to bend depending on the shape. For example, in the case of the quadrangle of FIG. 2B, the toothbrush bristle material is difficult to bend in the opposite diagonal direction, but is easily bent in the opposite opposite direction.

  In this way, in a conventional toothbrush using a flat wire, the toothbrush bristle material is bent in two and planted, so if the toothbrush bristle material has an irregular cross-sectional shape, the bending direction is determined, and the toothbrush bristle It becomes difficult to obtain a toothbrush with a high flocking density without the materials making good contact. Moreover, since the conventional toothbrush uses the flat wire, the hair material for toothbrushes decreases by the space of a flat wire, and it becomes difficult to obtain the flocking density.

  On the other hand, since the bristle material for toothbrushes of the present invention is used for a flat wire toothbrush, it is not necessary to consider these problems, so it can be said that it is suitable for a flat wire toothbrush.

  Hereinafter, the toothbrush bristle material of the present invention will be described in detail with reference to examples, but the toothbrush bristle material of the present invention is not limited to the following examples unless it exceeds the gist.

  In addition, about the physical property of the bristle material for toothbrushes in a Example and a comparative example, and practical evaluation of a toothbrush, it performed as follows.

  In addition, N610 resin (M2001 manufactured by Toray Industries, Inc.) and PBT resin (M1200S manufactured by Toray Industries, Inc.) were used as raw materials for synthetic resin monofilaments in Examples and Comparative Examples.

[Flocking density]
The number of the toothbrush bristle material that was planted (in the case of a flat toothbrush, it was folded in two and planted twice, so it was converted to 2 times) was counted, and the number of tufts per unit area (mm ² ) of the tuft hole was converted.

[Cleanability]
Plaque stain solution (plaque check solution) is uniformly attached to the upper surface of a 10 mm cubic acrylic plate, and using the created toothbrush, the upper surface of the acrylic plate is subjected to a vertical load of 350 g, an amplitude length of 30 mm, and an amplitude speed of 180. Brushing was performed for 3 minutes under the condition of reciprocation / minute, and the area of the removed plaque staining solution was measured. And the removal rate (%) was calculated | required from the adhesion area of the plaque staining liquid before brushing, and the area of the removed plaque staining liquid. A higher removal rate (%) indicates better cleaning properties.

[Tactile]
Fifteen monitors were asked to evaluate the tactile sensation of the toothbrush in the following four stages.
1 ... The contact of the hair ends was very good and the feel was excellent.
2 ... The hair touch was good and the touch was good,
3 ... There was no problem with the hair contact, but the tactile feel was not good.
4 ... The contact of the hair tip was bad and the touch was also bad.

[Examples 1 to 6]
N610 resin or PBT resin is supplied to an extruder type melt spinning machine, and the synthetic resin is melted and kneaded in the melt spinning machine, extruded into a melt pack, and the melted synthetic resin is spun from a hole in a die attached to the melt pack. did. At this time, the shape of the hole of the die used was suitable for the desired cross-sectional shape.

  Next, the spun synthetic resin was cooled and solidified in a cooling bath, and subsequently stretched and heat-set in a high-temperature medium, and then an oil agent was applied to wind up a synthetic resin monofilament having a diameter of 0.19 mm. The wound synthetic resin monofilament was cut into a desired length to produce a cut bristle, which was used as a toothbrush bristle material.

  Then, an ABS head insert having 28 flocking holes with a diameter of 1.5 mm in a 10 mm × 22 mm flocking area is prepared, and a toothbrush bristle material is inserted into the flocking hole so that the hair length is 12 mm. Further, this head insert was fixed to the toothbrush body to produce a flat wire toothbrush.

[Examples 7 to 8]
The bundle of cut bristle obtained in Examples 2 and 6 was immersed in an alkaline solution and subjected to chemical treatment to produce a toothbrush bristle material having a tapered portion at one end of the cut bristle.

  And the flat hair toothbrush was produced by the same method as Example 2 and 6 using the obtained bristle material for toothbrushes.

[Comparative Examples 1-2]
A cut bristle was produced by the same manufacturing method as in Examples 1 and 2 except that the cross-sectional shape was a circular cross-section, and this was used as a toothbrush bristle material.

  And the flat hair toothbrush was produced by the same method as Example 1 and 2 using the obtained bristle material for toothbrushes.

[Comparative Example 3]
The bundle of cut bristle obtained in Comparative Example 2 was immersed in an alkaline solution and subjected to chemical treatment to produce a toothbrush bristle material having a tapered portion at one end of the cut bristle.

  And the flat hair toothbrush was produced by the same method as Example 1 and 2 using the obtained bristle material for toothbrushes.

[Comparative Example 4]
A toothbrush bristle material was produced in the same manner as in Example 2 except that the length was 30 mm. Next, prepare an ABS toothbrush body having 28 flocking holes with a diameter of 1.5 mm in a 10 mm x 22 mm head, and plant the flocked toothbrush bristle material with a flat wire between them. A 12 mm flat wire toothbrush was prepared.

  Table 1 shows the evaluation results of the toothbrush bristle material of the present invention and the toothbrush using the same.

  As is clear from Table 1, the toothbrush bristle material (Examples 1 to 8) of the present invention, when used in a flat wire toothbrush, is closely planted with the toothbrush bristle material, so that the hair is planted at a high density. A toothbrush excellent in touch is obtained.

  The bristle material for toothbrushes of the present invention has a cleanability effect by high-density flocking, and the apex or convex part of the irregular cross-sectional shape appears along the length direction of the bristle side surface. Since it works to scrape off the surface dirt, a remarkable cleaning effect is exhibited.

  On the other hand, the toothbrush using the toothbrush bristle material of the conventional circular cross section and the toothbrush using the conventional flat wire (Comparative Examples 1 to 4) have a lower flocking density than Examples 1 to 8, and have a tactile sensation. It turns out that it is a toothbrush lacking in property and cleanability.

  The flat wire toothbrush using the toothbrush bristle material of the present invention is a toothbrush excellent in tactile sensation compared to the conventional flat wire toothbrush because the toothbrush bristle material is densely planted, Because the cross section is an irregular cross-sectional shape, the apex or convex part of the irregular cross-sectional shape appears along the length of the bristle on the side of the toothbrush bristle material, and acts to scrape off the dirt on the tooth surface. Demonstrate the outstanding effect of further improving the cleanability by density flocking.

(A), (b) is a perspective view which shows an example of the bristle material for toothbrushes of this invention. (A)-(k) is sectional drawing which shows the other cross-sectional example of the bristle material for toothbrushes of this invention. (A), (b) is the enlarged view which looked at the flocked part at the time of using the bristle material for toothbrushes of this invention for a flat wire toothbrush from the upper direction. It is the enlarged view which looked at the flocked part at the time of using the bristle material (circular cross section) for the conventional toothbrush for a flat wire toothbrush from upper direction. It is sectional drawing which shows an example of the bristle material for toothbrushes (multi-leaf shaped cross section) of this invention. (A) is explanatory drawing which shows the method of planting the toothbrush bristle material to the toothbrush which used the conventional flat wire, (b) is the enlarged view which looked at the flocked part from upper direction, (c) is a perspective view of the conventional toothbrush. It is. (A) is explanatory drawing which shows the method of flocking the toothbrush bristle material to a flat wire toothbrush, (b) is the enlarged view which looked at the flocked part from upper direction, (c) is a perspective view of a flat wire toothbrush. (A) is the enlarged view which looked at a part of toothbrush at the time of flocking the conventional bristle material for circular cross-section toothbrushes which has a taper part from the side, (b) is flocking the hairbrush hair material of this invention which has a taper part It is the enlarged view which looked at a part of toothbrush in the case of having been seen from the side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Toothbrush bristle material 2 Convex part 3 Concave part 4 Inscribed circle 5 Inscribed circle 6 Intermediate circle 7 Taper part 8 Tip part 11 Planting hole 12 Head insert 13 Welding part 14 Toothbrush main body 15 Head part 16

Claims (6)

A bristle material for toothbrush made of a synthetic resin monofilament cut bristle, wherein the cross section perpendicular to the length direction of the cut bristle is an irregular cross sectional shape other than circular, and the length of the cut bristle is 10 mm to 25 mm Toothbrush bristle material characterized by being in range. The bristle material for toothbrushes according to claim 1, wherein the cut bristle has a cross-sectional shape of a polygon having 3 to 8 apexes. The bristle material for toothbrushes according to claim 1, wherein the cut bristle has a multi-leaf shape having a cross-sectional shape of 3 to 10 protrusions. The bristle material for toothbrushes according to any one of claims 1 to 3, further comprising a tapered portion at one end of the cut bristle. A toothbrush using the toothbrush bristle material according to any one of claims 1 to 4 as at least a part of the bristle material, wherein the toothbrush bristle material and the toothbrush body are integrated without using a flat wire. A toothbrush characterized by being molded. The toothbrush bristle material and the toothbrush body are integrally formed through a head insert, and after inserting one end of the toothbrush bristle material or one end that is not a taper portion into the flock hole provided in the head insert, After fixing the toothbrush bristle and the head insert by thermally welding one end of the toothbrush bristle protruding to the opposite side and / or a part of the head insert, the head insert is further secured to the toothbrush body. The toothbrush according to claim 5.

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