TWI421043B - Toothbrush - Google Patents

Description

toothbrush

The present invention relates to a toothbrush having excellent tartar removal effect and cleaning property, in particular, to a tooth and a tooth (inter-tooth portion), in particular, to a tooth interdental portion, a tooth edge portion, and A dentate (plaque) of a periodontal capsular bag or the like is associated with a toothbrush having an excellent removal effect.

Traditionally, in order to improve the tartar removal effect and the cleaning toothbrush in the narrow portion of the interdental portion and the periodontal capsular bag, various toothbrushes for the shape of the anterior end of the bristles composed of synthetic resin fibers are commonly used. Well known. For example, the bristle diameter of each portion of the specific length is formed into a tapered shape at a specific ratio with respect to the bristle diameter of the base portion from the tip end portion of the tapered portion of the synthetic monofilament fiber of the tuft of the toothbrush (refer to Patent Document 1). And one end of the fiber of the fiber bundle bent into a U-shaped hair bundle of the bristle head is formed into a spherical shape, and the other end is tapered, and the two front ends of the silk fiber are different in shape, or the foregoing A toothbrush in which one end of the silk fiber is protruded from the other end (refer to Patent Document 2), or a toothbrush in which a long-cone and a short-cone material are mixed in a planting table (refer to the patent document) 3) or the like, or a tipping hair having a tapered tip to improve the insertion of the interdental portion and the narrow portion of the periodontal pocket. In addition, the front end portion of the composite synthetic resin fiber which has a cross-sectional shape of the island portion made of the polyamide resin in the sea portion made of the polyester resin is immersed in an acid or alkali solution to make the sea portion only the island portion. The tip of the hair is exposed, and the island-in-a-sea composite fiber having a core length of a specific length is planted on the toothbrush of the planting table (refer to Patent Document 4), or a plurality of cross-sectional shapes of the base of the planting table are rounded and elliptical. A bristles composed of unit cross-sectional elements of a specific shape such as a triangular shape or a hexagonal shape are immersed in a chemical solution such as an acid or an alkali, and a plurality of branches are formed at the tip end portion of the bristles, and the bristles of the tapered bristles which are sharp at the tip end are formed. Toothbrush (refer to Patent Document 5), or to form a plurality of tapered tapered hairs at the front end portion, and to perform a toothbrush having different lengths of bristles with respect to a specific branching hair (refer to the patent document) 6) The various ends of the filaments of the filaments form a variety of toothbrushes.

In addition, there are various proposals for the toothbrush that is fixed to the cross-sectional shape of the hair bundle of the hair-planting station of the toothbrush. For example, a toothbrush in which a bristles are implanted in a substantially triangular-shaped planting hole (for example, Patent Document 7), a front end face of a hair bundle (clump) having a cross-sectional shape such as a triangle or a fan shape is cut into an inclined plane tooth (for example, Patent Document 8), which has a cross-sectional shape of a meniscus shape, a triangle shape, or the like, having a hair bundle (cluster) of an acute angle portion, a toothbrush disposed at a peripheral portion of the hair-planting surface of the planting table, and having the acute-angle portion located outside (for example, Patent Document 9), a toothbrush having a cross-sectional shape of a tip-shaped hair bundle having a cross-sectional shape from the outer edge portion of the bristle surface toward the longitudinal axis or toward the outer edge of the bristle surface (for example, Patent Document 10) .

[Patent Document 1] Japanese Laid-Open Patent Publication No. Hei No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. Japanese Patent Publication No. 2003-144229 (Patent Document 6) Japanese Laid-Open Patent Publication No. 2003-199626 (Patent Document 7) Japanese Laid-Open Publication No. SHO 56-58227 (Patent Document 8) Japanese Patent Publication No. 2004-502268 (Patent Document 10) Japanese Patent Publication No. 2002-502268

As described above, in order to improve the removal and cleaning effect of the tartar deposited in the interdental portion or the periodontal pocket, the toothbrush for the shape of the front end of the bristles or the cross-sectional shape of the tuft is conventionally Everyone knows. However, the fact that the tip end of the bristles is formed into a tapered shape (cone shape) can actually improve the insertion of the bristles to the narrow portion of the interdental portion or the periodontal pocket, but, on the other hand, sometimes, The rigidity of the bristles is lowered, and the problem of the effect of removing the tartar removal effect and the cleaning property of the entire tooth including the relatively flat portion such as the tooth surface cannot be obtained. In addition, tartar removal and cleaning of the interdental part, especially the interdental gingival part, the edge of the tooth, and the periodontal pocket of the root of the tooth can not be obtained by the cross-sectional shape of the hair bundle. Toothbrush. Therefore, the object of the present invention is to provide a toothbrush having excellent tartar removal effect and cleaning property between the interdental portion, between the teeth and the gums, and further, to provide excellent oral operation, new style, and the like. Toothbrush.

The toothbrush of the present invention is characterized in that the hair-planting table of the brush body of the synthetic resin is fixed with a plurality of hair bundles formed by synthetic resin bristles to form a hair-planting portion, and a part of the plurality of hair bundles, The cross-sectional shape is substantially the same, and the distance between the centers of the tufts is adjacent to the axial direction of the toothbrush so as to be substantially equal to the length of the one tooth in the width direction.

The distance between the centers of the bundles of the same cross-sectional shape disposed in the axial direction of the toothbrush is 5 to 12 mm so that the distance between the centers is equal to the length in the width direction of one tooth. Further, the hair bundles of the same cross-sectional shape disposed in the axial direction of the toothbrush are arranged adjacent to the side edge portion of the flocking table so that the distance between the centers is equal to the length of the one tooth in the width direction.

Further, the cross-sectional shape of the tuft of the same cross-sectional shape disposed adjacent to the axial direction of the toothbrush is substantially triangular so that the distance between the centers is equal to the length of the one tooth in the width direction, and the triangular cross-section The tufts are fixed to the flocking table with the substantially triangular tip portions oriented in the same direction. Further, the tuft of the triangular cross section is substantially triangular in cross section from the side edge portion of the flocking table toward the axis of the toothbrush. The tuft of the triangular section has a cross-sectional shape inscribed in a circle having a diameter of 1.4 to 4.5 mm.

Further, in the case of the toothbrush of a good form, a bundle of hair having a transverse cross-sectional shape in which the axial direction of the toothbrush is long is disposed between the bundles of the plurality of triangular sections which are juxtaposed in the axial direction of the toothbrush. At this time, the hair bundle of the elongated cross section is disposed outside the hair bundle of the triangular cross section in the width direction of the tufting stage. Further, the cross-sectional shape of the hair bundle of the elongated cross section is substantially quadrangular.

The bristles of the tufts of the same cross-sectional shape disposed in the axial direction of the toothbrush are subjected to tip-finishing so that the distance between the centers is substantially equal to the length in the width direction of one tooth. The aforementioned bristles subjected to tip-finishing are subjected to front-end split processing. Further, the tufts formed by the bristles subjected to the usual tip circular processing are fixed to the side closer to the axis of the toothbrush than the position of the tuft formed by the tip-finished bristles.

Further, in the toothbrush of the present invention, the bristle surface formed by the front end surface of the tuft has irregularities. Further, a central portion of each of the front end faces of the tufts formed by the front ends of the bristles is formed in a convex shape.

The length of the bristles to which the tip is finely machined is substantially the same as or longer than the bristles to which the above-mentioned conventional tip circular processing is applied.

Further, the hair bundle of the toothbrush of the present invention is fixed to the flocking table by heat. In this case, the number of bristles of the tuft of the triangular section and/or the number of bristles of the tuft of the elongate section are taken out by means of removing the same amount of bristles when the tuft is thermally fixed to the tufting table. A substantially integral multiple of the number of bristles, or the cross-sectional area of the bristles of the tufts of the triangular cross-section and/or the cross-sectional area of the bristles of the tufts of the elongate cross-section, by means of heat-fixing the tufts A device that takes out the same amount of bristles during the flocking station and takes out a substantially integral multiple of the cross-sectional area of the bristles of the voids of the bristles.

In the toothbrush of the present invention, the hair bundles having substantially the same cross-sectional shape are disposed adjacent to each other at a predetermined interval in the axial direction of the toothbrush so that the distance between the centers is substantially equal to the length in the width direction of one tooth. The hair bundle particularly conforms to the interdental portion, in particular, the position of the interdental gum portion, and the cleaning property and the tartar removal effect for the portion are excellent. Further, the hair bundle adjacent to the specific interval is fixed to the side edge portion of the flocking table, and the tooth tip of the toothbrush is in contact with the tooth at right angles, and the brushing method is slightly moved before and after (the axial direction of the toothbrush), or the hair tip is obliquely inclined. It is easier to abut against the interdental portion than when the teeth and the gums are in contact with each other and the immersion method of moving the teeth slightly before and after the brushing is performed. Further, the bundle of hair bundles adjacent to the specific interval has a substantially triangular shape in cross section, and the substantially triangular tip portion is fixed in the same direction. Further, the cross-sectional shape of the bundle of the triangular section is from the planting station. The side edge portion is substantially triangular in shape toward the tip end of the tooth center of the toothbrush, and has better conformity to the interdental gum portion.

Further, a toothbrush having a cross-sectional shape in which an axially long section of the toothbrush is elongated in a longitudinal section is disposed between the bundles of the triangular cross sections adjacent to each other at a predetermined interval in the axial direction of the toothbrush, and the washing method is performed by the aforementioned washing method. When the immersion method is used for brushing, the hair bundle of the elongated section is located at the edge of the tooth and the periodontal pocket of the tooth at the root of the tooth and the boundary of the gum, and the bundle of the three sides of the triangle is located at two. The position of the interdental portion between the teeth on the side can clean both the edge portion of the tooth, the periodontal pocket, and the interdental portion, and has excellent cleaning performance and tartar removal effect. Further, the hair bundle of the elongated cross section is disposed on the outer side of the hair bundle of the triangular section of the flocking station, and the hair bundle of the elongated section and the bundle of the triangular section can surely abut against the edge portion of the tooth and the periodontal pocket thereof. And the interdental gums on both sides make it easier to perform cleaning and tar removal of these parts.

The cross-sectional shape of the hair bundle of the elongated cross-section is substantially quadrangular, and it is easy to remove the periodontal pocket and remove the tartar when the teeth are brushed by the washing method or the immersion method of moving the toothbrush in the front-rear (axial direction).

In addition, the bristle tip is finely machined to the tuft of the triangular section, and preferably the tip of the bristle section is subjected to tip finishing, and the front end of the bristle can enter the narrow space of the periodontal pocket and the interdental portion, and Excellent cleaning performance and tartar removal. Further, if the bristles subjected to the tip-finishing process are bristles subjected to the front-end splitting process, the insertability to the periodontal pocket and the interdental portion is preferable, and the cleaning property and the tartar removing effect are high. On the other hand, the bristles of the tufts attached to the tuft of the toothbrush on the axial side of the toothbrush can improve the rigidity of the bristles and the dirt on the surface of the teeth if the bristles of the generally pointed circular processing are applied. The effect is removed, and the cleaning property of the entire tooth is improved.

In addition, the length of the bristles to which the tip-finishing is applied is substantially the same as or longer than the bristles to which the conventional tip-circular processing is applied, and the bristles subjected to the tip-finishing are subjected to a small round of resistance. Since the other bristles are processed, the distal end thereof is easily inserted into the periodontal pocket and the interdental portion, and the cleaning property and the tartar removal effect of the portions are also improved.

Further, it is preferable that the bristle surface composed of the front end surface of the tuft is not flat but is formed with irregularities, and the bristle of the bristles also conforms to the concavities and convexities of the dentition. Further, when the central portion of the front end face of the tuft formed by the front end of the bristles fixed to the respective tufts of the flocking table is formed in a convex shape, the insertion of the tufts into the concave portion is better and more preferable.

In addition, the bristles are not fixed by the flat wire and are fixed to the planting table, which can reduce the thickness of the planting table. In addition to the operability of the toothbrush in a good oral cavity, it is easy to fix the hair bundle in a triangular shape. On the planting platform. In addition, in general, when the hair bundle is heat-fixed to the flocking table, the hair bundle bundled by the bristles which are cut into a predetermined length in advance is used, and the device for taking out the bristles (the plucking machine or the like is used, however, it is not limited to the drawing. The hair machine is set to a receiving hole formed in the mold member (first mold), and a space for forming a bristle (cavity) is formed between the mold for forming the bristle (second mold), and the molding material of the brush body is ejected to The forming space is filled and molded, and in the toothbrush of the present invention, the number of bristles of the bundle of substantially triangular cross-sections and the cross-sectional area and/or the number of bristles of the bundle of the elongated cross-section and the cross-sectional area If it is a substantially integral multiple of the number of bristles taken out by a plucking machine or the like that takes out the same amount of bristles, or if it is a substantially integral multiple of the cross-sectional area of the bristles with respect to the bristles of the bristles, it is only necessary to adjust and utilize The number of times the hair extracting machine is removed can change the size of the hair bundle, and is extremely convenient in the manufacturing process.

1 to 3 are views showing an embodiment of the toothbrush of the present invention, wherein Fig. 1 is a perspective view of a portion of the planting station, Fig. 2 (a) is a front view of the toothbrush, and Fig. 2 (b) is a plan view thereof. Fig. 3(a) is a front view of a portion of a planting station, Fig. 3(b) is a plan view thereof, and Fig. 3(c) is a side view thereof. The toothbrush 1 has a hair-growing portion 9 in which a plurality of hair bundles 4, 5, 6, and 7 are fixed to one end of the brush body 10.

The brush body 10 is formed by one of injection molding of a thermoplastic resin, a planting table 3 planted with tufts 4 to 7; a grip portion 11 for holding the toothbrush 1; and a connection for the hair planting table 3 and the grip The slender neck 2 of the handle; The type of the thermoplastic resin used as the material of the brush body 10 is not particularly limited, and for example, from polybutylene terephthalate resin, polypropylene terephthalate resin, or polyethylene terephthalate can be used. Polyester resin such as ester resin, polyethylene naphthalate resin, PCTA resin, PCTG resin, or polyacetal resin (homopolymer, copolymer), polycarbonate resin, aliphatic polyamide resin, A resin selected from the group consisting of aromatic polyamine resins, polypropylene resins, and polyethylene resins is a resin having a main component. It is preferable to use a resin selected from the group consisting of polybutylene terephthalate resin, polyethylene terephthalate resin, PCTA resin, PCTG resin, and the like, and a resin selected from polyacetal resins as a main component. Resin. PCTA resins such as copolymers of cyclohexanedimethanol (CHDM) and terephthalic acid (TPA) ester compounds, CHDM and isomeric acid (IPA) ester compounds, in addition, the aforementioned PCTG systems such as ethylene glycol and CHDM The copolymer of the ester compound and the ester compound of CHDM and TPA is a saturated polyester resin. In addition, the main component herein is a mixture of other resins and blends or alloys, and the resin 50 is contained in a proportion by weight or more, or among other polymers. The repeating unit of the polymer of the resin contains a ratio of 50% by weight or more. Thermoplastic resins as the main components mentioned above and other thermoplastic resins which can be used in the mixing or copolymerization, in addition to the resins which can be used as the main components listed above, such as ABS resin, polystyrene resin, EPDM, A polypropylene resin, a polyamine propionate resin, a polyarylate compound, a thermoplastic synthetic rubber, an anthracene resin, a fluororesin, or the like.

The tufts 4 to 7 fixed to the tufting table 3 of the toothbrush 1 should be bundles of bristles made of synthetic resin, and heat-sealed by heat sealing, fusion, or in-mold method without using a flat wire. Formed in the way of planting hair table 3, so-called, no flat line toothbrush. The method of fixing the hair tufting station 3 without using a flat wire is as long as it is a conventionally known method, and the fusion method is disclosed in Japanese Laid-Open Patent Publication No. Sho 60-241404, and Japanese Patent Laid-Open No. 61-76104 Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. The method described in the Japanese Patent Publication No. Hei 9-512724, and the Japanese Patent Publication No. 2003-102552. By using these methods, the hair bundles 4 to 7 can be heat-fixed to the planting station 3 without using a flat wire, and the depth of the hair bundle embedded in the planting table 3 can be as shallow as possible, and the thickness of the planting platform 3 can be For example, it is 4 mm or less, or even an extremely thin 3.5 mm or less, and it is possible to manufacture an excellent oral operability and to facilitate a new style of toothbrush.

As shown in Figs. 1 to 3, a plurality of tufts 4 to 7 are arranged on the hair-growing surface 3a of the tufting table 3 so that a plurality of rows are arranged in the direction of the axis X of the toothbrush 1. The central tufts are arranged along the axis X and the larger tufts 4 located on the most front end side of the tufting table 3, and the smaller of the smaller bundles 5 are 5 bundles of hair bundles. The bundles 4 and 5 form a substantially square shape in which the cross-sectional shape is long in the X-axis direction. On the left and right side edges of the center bundle, the first, third, and fifth tufts 4, 5, 5 from the front end side of the center tuft are perpendicularly intersected in the X-direction of the axis. At the adjacent position, three bundles 5 of the same size and cross-sectional shape as the four bundles 5 of the center row are disposed with a predetermined interval therebetween. The tufts 4 and 5 are constructed of bristles that are usually rounded at the tip end. Further, the bristle faces 4a and 5a composed of the bristles of the tufts 4 and 5 are formed in a mountain shape composed of two inclined faces which are inclined forward and backward from the central portion of the axial direction of the toothbrush 1 in the X direction.

Further, between the three bundles of hair bundles 5 of the left and right bundles, the cross-sectional shape is fixed from the side edge portion of the tufting table 3 toward the axis X of the toothbrush, that is, from the side edge portion of the tufting table 3. The tip of the tip toward the inner side is a thin bundle of bundles 6 of generally triangular shape. Further, the side edge portion of the substantially central portion in the X-direction of the toothbrush 1 of the tufting table 3 is fixed to the axial center X by the bundle of bundles 6 and 6 of the triangular cross section. A bundle of hairs 7 having a longer four-corner shape. The tufts 6 of the triangular section and the tufts 7 of the quadrangular cross section fixed to the side edges between them (the black painted tufts in Fig. 3) are different from the other tufts 4 and 5 (Fig. 3) The hair bundle indicated by a blank is composed of bristles which are subjected to tip-finishing, and the bristle faces 6a, 7a formed by the front ends of the bristles form a plane parallel to the hair-planting face 3a.

The bundle of hair bundles 6 of the triangular section is the distance between the centers of the two bundles of hair bundles 6 adjacent to the axial direction X of the toothbrush 1 (d in FIG. 3(b)) and the length in the width direction of one tooth (5th) The diagram w) is configured in a substantially equal manner. The distance d between the centers of the hair bundles 6 of the triangular cross-section is different depending on the style of the toothbrush. For example, it varies from adult to child to child, for example, 5 to 12 mm, and the usual toothbrush is 6 to 10 mm, preferably 7~9.5mm. Further, the cross-sectional shape of the hair bundle 6 of the triangular cross section is not particularly limited, and the equilateral triangle or the equilateral triangle is more in conformity with the interdental gingival portion such as the incisors and the molars. Further, the size of the bundle 6 of the triangular section is 1.4 to 4.5 mm in diameter, and preferably has a cross-sectional shape inscribed in a circle having a diameter of 2.0 to 4.0 mm. The hair bundle 6 having the triangular distance between the center and the triangular cross section as described above is disposed adjacent to the axial direction X of the toothbrush, so that the bundle 6 of the triangular section can be more conformed to the interdental portion, in particular, The interdental gums.

Next, Fig. 4(a) is a plan view showing another embodiment of the toothbrush of the present invention. In the configuration of the hair-planting portion 9 of the toothbrush 1A of the present embodiment, the cross-sectional shape of the bristles which are fixed to the side edge portion of the flocking table 3 by the tip-finished bristles is from the side edge portion of the flocking table 3 toward the toothbrush portion. The axis X, that is, the cross section of the three bundles of hair bundles 6 which are triangular in shape from the side edge portion of the tufting table 3 toward the inner side, is fixed by a cross section which is also formed by the tip-finished bristles. The shape is a bundle of hair bundles 7 of a quadrangular shape having a long axis X direction.

Fig. 4(b) is a plan view showing another embodiment of the toothbrush of the present invention. The hair-planting portion 9 of the toothbrush 1B of the present embodiment is formed on both side edges of the planting table 3, and the cross-sectional shape of the bristles subjected to the tip-finishing is from the side edge portion of the flocking table 3 toward the toothbrush The bundle of hair bundles 6 of the triangular shape of the tip of the axis X is arranged in the X direction of the axis of the toothbrush, and on the inner side, two rows of bristles to which the usual tip circular processing is applied are fixed. The cross-sectional shape of the configuration is a bundle of three bundles 8 having a substantially triangular cross section from the axis X of the toothbrush toward the tip end portion of the tufting table.

In the toothbrushes 1A and 1B of the embodiment shown in Figs. 4(a) and 4(b), the distance between the centers of the two bundles of hair bundles 6 in the axial direction X of the toothbrush 6 of the triangular cross section is adjacent. It is also roughly equal to the length of the width direction of one tooth (w shown in Fig. 5), for example, 5 to 12 mm, and the usual toothbrush is about 6 to 10 mm, and if it can be configured to be 7 to 9.5 mm, more preferably, The cross-sectional shape has a diameter of 1.4 to 4.5 mm, preferably an inner diameter of 2.0 to 4.0 mm.

In the case of the toothbrush 1, 1A, and 1B according to the embodiment of the present invention as described above, the hair bundle 6 composed of the bristles subjected to the tip-finishing is fixed to the flocking table 3 in a substantially triangular cross section, and The bundle of the triangular cross-section of the plurality of triangular sections adjacent to the direction of the axis X of the toothbrush is arranged such that the distance d between the centers of the respective bundles is substantially equal to the length w of the width direction of one tooth, so that the interdental portion is particularly Yes, the interdental gingival portion has excellent cleaning properties and tartar removal effects. In addition, since the tufts 6 of the triangular cross-section are fixed to the side edges of the flocking table, the tip of the toothbrush is in a right angle to the teeth and is moved slightly forward and backward to perform the brushing method, or the hair tips are obliquely opposed to the teeth and the gums. When the boundary is moved slightly forward and backward to perform the brushing method, the hair bundle 6 of the triangular section can well resist the interdental portion, and in particular, the interdental gingival portion can be well pressed, so that the portion can be well cleaned. And tartar removal. Further, in the toothbrushes 1 and 1A of the above-described embodiment, the hair bundles 7 having an elongated cross section having a long cross-sectional shape in the axial direction of the toothbrush are disposed between the hair bundles 6 of the triangular cross-section, as shown in Fig. 5. It can be seen that the tuft 7 of the elongated section can be located at the edge portion S of the tooth at the boundary between the tooth T and the gum G. At the same time, the tuft 6 of the cross-sectional triangular section can surely resist the interdental portion B between the teeth T on both sides, especially Since the interdental gum portion N can be surely pressed, the tooth edge portion S and the interdental portion B (the interdental gum portion N) can be simultaneously cleaned. Moreover, since the bristles of the tufts 6 of the triangular section and the tufts 7 of the elongated section have been subjected to tip cutting, the front end thereof can enter the narrow space of the periodontal pocket and the interdental portion B, and the portion is cleaned and Remove tartar. In addition, since the tufts 7 of the elongated cross section are disposed on the outer edge side of the flocking table more than the tufts 6 of the triangular cross section, the tufts 7 of the elongated cross section and the tufts 6 of the triangular cross section can surely resist the edge portion S of the teeth. And the interdental gum portion N on both sides is easier to clean and remove tartar for these parts.

The bristle material used in the present invention may be a polyamine resin such as nylon or guanamine, or polybutylene terephthalate (PBT) or polypropylene terephthalate (polytrimethylene terephthalate). , PPT or PTT), or polyester resin such as polyethylene terephthalate (PET), synthetic resin such as polypropylene (PP) or polyethylene (PE), etc. Resin. Further, the shape of the front end of the bristles to which the tip is finely machined is not particularly limited, and the well-known bristles subjected to the taper processing may be used. The shape and length of the taper are not particularly limited, and the rigidity and the cleaning property of the bristles are considered. Etc., the length of the taper portion should be 1/2 or less of the length of the hair (the length from the hair-planting surface 3a to the front end of the bristle). Further, the bristles subjected to the tip-finishing can be used other than those which are usually processed by taper.

Fig. 6(a) shows the front end portion of the synthetic resin yarn F of the embodiment of the bristles used in the toothbrush of the present invention. The tip side of the silk fiber F forms a plurality of branches, and the tip of the split hair (the split hair 21) is a tip-shaped fine hair which is formed into a tapered tip. The fiber F of the split bristles 21 at the tip end is connected to the unit cross-section elements 22 of various shapes such as a circular shape, an elliptical shape, a triangular shape, and a hexagonal shape as shown in FIGS. 6(b) to 6(h). The shape of the profile. In addition, it is also possible to connect a single portion or a plurality of petals having a cross-sectional area different from the portion of the flap having a thickness smaller than the smallest cross-sectional area of the flap around the specific flap. Petal profile. At this time, the number of the petals is preferably 2 to 5, however, the number of the petals is not limited and can be determined according to the purpose of use. The synthetic resin-made silk fiber F having the cross-sectional shape described above is immersed in a chemical solution such as caustic soda (NaOH), an acid or an organic solvent, and taken out, and as shown in Fig. 6(a), a plurality of tapered split hairs can be formed at the front end. twenty one. At this time, the shape and length of the split bristles 21 can be arbitrarily adjusted by the concentration of the chemical solution, the immersion time, and the speed at which the liquid is taken out. As the material of the synthetic resin yarn F, any of the above-mentioned various synthetic resins can be used.

The synthetic resin-made filament fiber F in which the tapered split bristles 21 are formed has a length from the branching point to the tip end which is 1/2 or less, preferably 1/3 or less, of the bristles height (i.e., the hair length) of the plucked state. In addition, the cross-sectional area of the base end side, that is, the portion where the dissolution treatment is not performed (the base of the bristle) differs depending on the cross-sectional shape, etc., as compared with the branching point, and is 0.001 to 0.5 mm ² , usually 0.01 to 0.2 mm ² . It is preferably 0.01 to 0.1 mm ² . If the cross-sectional area of the base of the bristle is less than 0.001 mm ² , the waist portion is weak and lacks the rigidity necessary for brushing. Further, when it exceeds 0.5 mm ² , the hair is too thick to reduce the insertability to the detail. Therefore, based on the lower limit and the upper limit, appropriate factors such as the cross-sectional shape and the material are considered, and the appropriate determination is made. In addition, when there are two types of bristles of different lengths, the length of the short-divided bristles should be in the range of 1/10 to 9/10 of the length of the long-divided bristles. When the length of the short-divided bristles is shorter than 1/10 of the length of the long-divided bristles, the brushing effect by the short-divided bristles is better, and if it is longer than 9/10, the effect of different lengths of the bristles cannot be fully exerted.

Fig. 7 (a) and (b) are other embodiments in which the synthetic resin yarn F of the tip end is finely divided. Three bristles 24 shown in the plural figures are formed at the front end of the sheath portion 23 of the synthetic resin fiber F. The front end of the sheath portion 23 protrudes from the fiber F of the front end of the plurality of core hairs 24, for example, the island portion is composed of a material mainly composed of a polyamide resin such as nylon or guanamine, and the sea portion is composed of polybutene. A composite synthetic resin monofilament fiber F (hereinafter referred to as a composite monofilament fiber) composed of a polyester resin such as phthalic acid ester as a main component, as shown in Fig. 7 (c) to (e), The composite fiber F which forms the sea portion 25 and the sea-island structure in which the island portion 26 is formed of the nylon resin is immersed in caustic soda (NaOH) and taken out, and the sea portion 25 is dissolved and removed from the tip end to expose the island portion 26, such as As shown in Fig. 7 (a) and (b), bristles in which a plurality of core hairs 24 are formed to protrude from the front end of the sheath portion 23 constituting the outer surface of the bristles are formed. At this time, the taper shape of the tip end of the sheath portion 23 and the exposed length of the core hair 24 can be appropriately adjusted by the concentration of the caustic soda, the immersion time, and the speed at which the caustic soda is taken out. Further, as shown in Fig. 8(b), the synthetic resin yarn fiber F having the cross-sectional shape of the plurality of unit cross-section elements 22 and each unit cross-sectional element 22 having a core-sheath structure or a sea-island structure has a cross-sectional shape and is immersed in A liquid medicine such as caustic soda (NaOH), an acid, an organic solvent, or the like is taken out, and as shown in Fig. 8(a), it is possible to obtain a plurality of filaments of the tapered hairs 21 which protrude from the front end to form a core fiber 24 of the core hair 24 (bristles) ).

The size of the silk fiber F formed by the bristles of the plurality of core hairs 24 is formed by the front end of the sheath portion 23, and the diameter of the base end side (core sheath composite portion) should be 0.150 to 0.300 mm, and the diameter of the core hair 24 should be 0.03~0.07mm, the exposed length of the core hair should be 0.2~4.0mm, and the exposed length of the core hair is preferably 0.5~4.0mm. Further, the length from the base of the hair graft to the front end (the length of the bristles exposed from the hair-planting surface 3a, that is, the length of the hair) should be 7 to 11 mm. Further, when the diameter of the base end portion is 100%, the boundary between the exposed core hair 24 and the composite portion should be used as a base point, and the diameter of the end portion of the composite portion which is 1 mm closer to the side of the composite portion than the base point is 70. Cone processing is performed in such a manner that the position of ±15%, 3 mm is 89±8%, and the position of 5 mm is 93±7%. When the diameter of the composite part is 0.150~0.300mm, the diameter of the core hair 24 is 0.03~0.07mm, and the exposed length of the core hair 24 is 0.2~4.0mm, it can have better insertion into the inner part of the mouth, and the details of the inner part of the mouth. The reachability of the inner deep portion and the tartar removal effect of the arriving core hair 24, and when the exposed length of the core hair 24 is 0.5 to 4.0 mm, the insertion into the inner cavity detail portion and the deep inner portion of the oral cavity can be further improved. The arrival property and the tartar removal effect of the arriving core hair 24. In addition, if the length from the base of the hair-planting island-type composite fiber to the front end is in the range of 7 to 11 mm, not only the sufficient waist stiffness which can fully exert the cleaning effect but also the excellent interdental portion can be obtained. The insertion of a narrow part is easy to operate.

Further, Fig. 9(a) shows a synthetic resin yarn F according to another embodiment of the bristles which are subjected to tip-cutting processing used in the present invention. The synthetic resin-made fiber F has a cross-sectional shape of a core-sheath structure or a sea-island structure, and should be formed into a tapered portion in which a sheath portion or a sea portion composed of a polyester resin as a main component is tapered toward a hair tip, and the tip of the hair is exposed. A single core hair 24 composed of a material having a polyamine resin as a main component. Specifically, as shown in FIG. 9(b), the front end side of the composite monofilament fiber F having the core-sheath structure of the sheath portion (sea portion) 25 disposed around the one core portion (island portion) 26 is provided. The core portion 26 is exposed, and as shown in Fig. 9(a), the front end protrudes from the core hair 24. In the case of the composite monofilament fiber F of the core-sheath structure, the cross-sectional area, that is, the cross-sectional area of the entire composite monofilament fiber F including the core portion 26 and the sheath portion 25, the cross-sectional area of the core portion 26 should be 15 to 80%. , preferably 40~80%. In this way, it is possible to maintain a moderate waist stiffness on the base end side of the brush, and to use the core hair 24 having a sectional area of 15 to 80% exposed from the distal end side, so that excellent fineness can be exhibited without damaging the gums. Moreover, it is also possible to prevent the tip of the hair from being bent or irregular when the heat setting operation of the planting table 3 is performed.

The method for exposing the core portion is the same as the case where the plurality of core portions are exposed as shown in FIGS. 7 and 8 , and when the single core portion 26 is exposed, in addition to the chemical method, the sheath portion can be removed by mechanical means. 25 means. In the case of the chemical removal method, for example, the core portion 26 is made of a polyimide resin, and the sheath portion 25 is immersed in an alkali solution such as caustic soda (NaOH) on the front side of the composite monofilament fiber F of a polyester resin such as PBT. The core portion 26 is exposed to form a filament F (bristles) projecting from the core hair 24 at the tip end.

As described above, at the end portion of the front end portion of the sheath portion 23 (sea portion 25) to be dissolved, the tapered portion 27 connected to the core hair 24 is inevitably formed, and the angle of the cone or the like can be easily controlled by controlling the immersion time or the like. Make adjustments. Forming the tapered portion 27 can further improve the insertability and reachability to the inner portion of the oral cavity.

The cross-sectional shape of the composite monofilament fiber F and the core portion 26 shown in Fig. 9(b) is substantially circular, and the outer diameter b2 of the composite monofilament fiber F is set to 0.16 mm to 0.25 mm, outside the core portion 26. The diameter b1 is set to 40 to 90% of the outer diameter of the composite monofilament fiber F, preferably 60 to 80%. The hair length from the base of the bristles of the bristles to the front end is in the range of 6 to 12 mm. When it is too long, not only the operability in the mouth will be deteriorated, but also the soft waist will be too soft to obtain a sufficient cleaning effect. On the other hand, if the hair is too short, the deformation of the hair during brushing is less, the feeling of use is deteriorated, and the insertability to the interdental portion is also deteriorated. Further, the exposed length of the core hair 24 should be set to a hair length of 5 to 50%, preferably 10 to 50%, and specifically, it should be set in a good range of 0.5 to 4.0 mm. When the exposed length of the core hair 24 is 05% or less, it is not possible to reliably reach the interdental portion, the periodontal pocket of the root portion, and the deep portion such as the alveolar cleft. Further, the longer the core hair 24 exposed by the core portion 26, the higher the cleaning effect on the deep portion, and conversely, the durability is lowered. The length of the core hair 24 which can maintain practical durability is 50% or less of the hair length, specifically, about 4.0 mm or less.

The shape of the front end of the exposed core hair 24 is not limited, and it can be processed into a hemispherical shape or the like. In the present embodiment, the material of the core portion 26 is a polyamide resin, and the core hair 24 exposed from the sheath portion 23 extends straight in a cylindrical shape. Thereby, it is possible to prevent the bending of the hair tips in the heat fixing operation of the planting table 12 and the like.

Next, the tenth figure is an example in which the cross-sectional shape of the core hair 24 exposed from the core portion 26 and the sheath portion 25 of the core portion 26 is substantially polygonal, and the eleventh figure is disposed on the outer peripheral surface of the core portion 26 in plural. An example of the ridge portion 28 extending in the axial direction is also an example in which the outer peripheral surface of the core portion 26 and the core hair 24 is provided with a plurality of grooves 29 extending in the axial direction.

As shown by the silk fiber F in Fig. 10, if the cross-sectional shape of the core portion 26 is a substantially polygonal shape having an acute angle portion, the base portion is exposed at the base end because the end portion of the sheath portion intrudes into the concave portion formed in the core portion 26 and It is left to form an intrusion portion, and it is possible to prevent the use of the sheath portion from peeling off from the exposed base end of the core portion, thereby improving durability. In the case of the silk fiber F shown in Fig. 11 and Fig. 12, the intrusion portion for invading the ridge portion 28 or the groove 29 is formed at the end portion of the sheath portion 23 as in the case of the above-described substantially polygonal shape. Peeling of the end of the sheath portion 25 can be prevented.

Fig. 13 (a) and (b) show a composite monofilament fiber F for bonding the adhesive layer A between the core portion 26 and the sheath portion 25, whereby the sheath can be more reliably prevented. Peeling of the end. Further, in Fig. 13, (c), the cross-sectional shape of the composite monofilament fiber F and the cross-sectional shape of the core portion 26 are substantially similar in shape, whereby the thickness of the sheath portion 25 is substantially uniform in the circumferential direction, so the sheath portion 25 It is not easy to peel off from the core portion 26.

The toothbrush of the present invention does not use a flat wire, and when the bristles are thermally fixed to the flocking table by an in-mold method or a fusion method, the front end of the bristles is pushed by a top plate or the like to form a front end face of the tuft and a front end face of the tuft. The brush surface is neatly formed into a desired shape, and the bristle surface formed by the front end of the bristles can be formed into an arbitrary shape. For example, the front end surface of the tuft is formed such that the center portion of the tufts 4 and 5 is higher (longer hair length) and lower toward the peripheral portion (short length of hair), and the bristle surface can be made It has a three-dimensional shape of the concavities and convexities in the width direction of the tufting portion (perpendicular to the direction of the axis X of the toothbrush). In this way, the front end surface of the tuft is formed into a mountain shape (convex shape), or irregularities are formed on the bristle surface, and the insertion property of the hair bundle between the interdental portion and the narrow portion between the teeth and the gums can be further improved, and A toothbrush with better cleaning performance and tartar removal effect.

In addition, the hair bundle obtained by bundling the bristles previously cut to a specific length may be taken out by the device for taking out the bristles, and the integral tufts may be thermally formed, and then the forming and discharging of the toothbrush may be performed by using the forming material of the main body. . The number of bundles 6 of the triangular section of the present invention and/or the bundles 7 of the elongated section should be substantially a multiple of the number of bristles removed by the means for removing the bristles. Here, the approximate integer multiple refers to an error of ±10% centered on the integer multiple value. Because the mechanism for taking out the bristle device will cause an error in the count of the removed bristles. Further, the cross-sectional area of the tufts 6 of the triangular cross-section and/or the tufts 7 of the elongated cross-section may be substantially a multiple of the cross-sectional area of the bristles of the voids of the bristles withdrawn from the take-up device. Further, considering the efficiency at the time of production, the number of branches or cross-sectional area of the tufts 6 of the triangular section and/or the bundle 7 of the elongated section is preferably relative to the number of bristles of the device for taking out the bristles or the bristles of the voids from which the bristles are taken out. It is roughly the same cross-sectional area. As described above, the toothbrush of the present invention can be thermally fixed to the flocking table 3 of the toothbrush body 10 by a method of inserting, melting, or the like, which is subjected to tip-finishing, or a general-purpose round-shaped synthetic resin fiber. And the cross-sectional shape of each tuft can be arbitrarily formed. In addition, the method may also be as follows, that is, the hair bundle formed by the bristles is thermally disposed in a manner to reflect the final hair-planting pattern, and then the prototype of the hair-planting portion is prepared, and thereafter, The formation of the brush body is carried out in such a manner that the plate is provided with the hair bundle, and the hair-planting portion is formed. That is, the shape of the tuft receiving hole of the tuft retaining fitting (first mold) when the bristles (bristles) are fixed to the tufting table 3 or the pores formed in the tufting table 3 is triangular, rectangular, or any other arbitrary shape. The shape is such that any bundle of cross-sectional shapes can be fixed to the tufting table 3.

Further, in the above embodiment, only the manual toothbrush 1 having the grip portion 11 is described. The toothbrush of the present invention may be a brush for an electric toothbrush having a short grip portion and a driving means.

(Example 1)

The grip portion 10 of the toothbrush shown in Fig. 2 is formed by injection molding using polybutylene terephthalate (PBT), and the hair bundles of the hair-planting portions 9 shown in Figs. 1 and 3 are omitted. The hair bundles 7 on both sides of the planting table 3 are embossed by the in-mold method with bristles (hereinafter, referred to as "normal hairs") which are subjected to tip round processing of the pair of nylon fibers as the bundles 6 and 6 of the triangular section. The toothbrush has a toothbrush having a cross-sectional shape of a circle having a diameter of 2.7 mm and a distance between the centers of 7.0 mm. In addition, the specifications of the tufts are shown in Table 1.

(Example 2)

The toothbrush was formed in the same manner as in Example 1 except that the distance between the centers of the bundles 6 and 6 of the triangular cross section of the toothbrush of Example 1 was changed to 9.4 mm.

(Example 3)

The toothbrush was carried out in the same manner as in the first embodiment except that the hair bundles 6, 6 of the triangular cross section of the toothbrush of the first embodiment were changed from the axial center of the toothbrush toward the side edge portion of the flocking table. Forming.

(Example 4)

The toothbrush was formed in the same manner as in Example 1 except that the hair bundles 6 and 6 of the triangular cross section of the toothbrush of Example 1 were implanted with a hair bundle (normal hair) having a square cross section.

(Example 5)

The toothbrush was formed in the same manner as in Example 1 except that the hair bundles 6 and 6 of the triangular cross section of the toothbrush of Example 1 were implanted with a hair bundle (normal hair) having a circular cross section.

(Example 6)

The toothbrush was molded in the same manner as in Example 1 except that the hair bundles 6, 6 of the triangular cross section of the toothbrush of Example 1 were changed to have a shape of a circle having a diameter of 2.0 mm.

(Example 7)

The toothbrush was molded in the same manner as in Example 1 except that the hair bundles 6, 6 of the triangular cross section of the toothbrush of Example 1 were changed to have a shape of a circle having a diameter of 4.0 mm.

(Example 8)

Except for the hair bundle 7 of the quadrangular cross section shown in Fig. 3(b) between the hair bundles 6 and 6 of the triangular section of the toothbrush of the first embodiment, the hairbrushes of the hair bundle 7 (the normal hair of 8 mm in length) shown in Fig. 3(b) are the same as the examples. In the same manner, the toothbrush was formed.

(Example 9)

The hair bundles 6 and 6 of the triangular cross section of the toothbrush of the eighth embodiment and the hair bundle 7 of the square cross section are divided into three parts by the PBT as the sea portion (sheath portion) and the nylon as the island portion (core portion). A toothbrush was molded in the same manner as in Example 8 except that the bristles having a hair length of 10 mm (hereinafter referred to as "special hairs" were used.

(Embodiment 10)

The toothbrush was formed in the same manner as in Example 1 except that the bundles 6 and 6 of the triangular cross section of Example 1 were changed to have a shape of a circle having a diameter of 1.4 mm.

(Example 11)

The toothbrush was molded in the same manner as in Example 1 except that the bundles 6 and 6 of the triangular cross section of Example 1 were changed to have a shape of a circle having a diameter of 4.5 mm.

(Embodiment 12)

The toothbrush was molded in the same manner as in Example 1 except that the distance between the centers of the bundles 6 and 6 of the triangular cross section of the toothbrush of Example 1 was changed to 11.0 mm.

(Comparative Example 1)

The toothbrush was molded in the same manner as in Example 1 except that the distance between the centers of the bundles 6 and 6 of the triangular cross section of Example 1 was changed to 3.5 mm.

(Comparative Example 2)

The toothbrush was formed in the same manner as in Example 4 except that the distance between the centers of the tufts of the quadrangular cross-section of Example 4 was changed to 3.5 mm.

(Comparative Example 3)

The toothbrush was molded in the same manner as in Example 5 except that the distance between the centers of the hair bundles of the circular cross section of Example 5 was changed to 2.5 mm.

For the toothbrushes of the respective examples and comparative examples formed as described above, the cleaning property (plaque removal property) was investigated by the following method. The results are shown in Table 2, and the judgment criteria of the cleaning property evaluation are shown in Table 3.

(evaluation method of cleaning)

The plaque-like substance is attached to the first large molar portion on the enamel model, and the enamel model is installed on the brushing simulation device, so that one end of the toothbrush planting portion is in contact with the first large molar of the upper jaw and the planting portion is covered by the first Set a toothbrush in the form of a large molar. Performing a brush stroke of 20 mm in the lateral direction, applying a load of 300 g, and 3 seconds, and calculating the area of the similar plaque for each part by the image analysis device, and the ratio of the suspected plaque removal area to the area where the suspected plaque adhered is plaque removal. rate. The cleanability of each part was evaluated using the obtained plaque removal rate.

In addition, the comprehensive evaluation of the cleaning property shown in Table 2 indicates the functional height of the toothbrush product, which is 2 points when the cleaning property of each part is "◎", 1 point when it is "○", and "△" when it is "○". The evaluation point is totaled in a 0.5 point manner, and the product with a higher total of the evaluation points is judged to be a product having a high-definition sweep effect. In addition, the comprehensive assessment that cannot meet the benchmark is “×”. In other words, if one of the cleaning evaluations of each part is "x", it is judged that the function of the product cannot be satisfied, and the comprehensive evaluation is also "x" which is unqualified. The “Comprehensive Assessment” and the evaluation of each part are not considered as qualified.

As can be seen from Table 2, the toothbrush of the present invention disposed adjacent to the axial direction of the toothbrush so that the distance between the centers of the tufts and the width of one tooth are substantially equal to each other has excellent cleaning properties for the entire tooth. In particular, the tuft of the triangular cross section is arranged so as to be thinner from the side edge portion of the flocking table toward the axis of the toothbrush, and has excellent cleaning properties for the interdental portion. In addition, a tuft of a quadrangular cross section is disposed between the tufts of the triangular cross section, so that the cleaning property of the root portion can be improved, and the front end splitting hair (special hair) is used to further improve the interdental portion and the root portion. Cleanability.

The tuft of the hair-planting portion of the toothbrush of the present invention is located at a good position with the interdental portion, in particular, at a position that is well matched with the interdental gingival portion, and has excellent cleaning property and tartar removal effect on the portion, for example The brush tip of the toothbrush is perpendicularly moved against the tooth and moved slightly forward and backward (the direction of the axis of the toothbrush) to perform the brushing method, or the tooth tip of the toothbrush is obliquely opposed to the boundary between the tooth and the gum, and the brushing is performed before and after the fine movement. In the immersion method, it is easier to apply the hair bundle to the interdental portion when brushing the teeth, regardless of whether the brushing method by the washing method or the immersion method is applied.

1. . . toothbrush

2. . . neck

3. . . Planting station

3a. . . Hair surface

4. . . Hair bundle

4a. . . Brushed surface

5. . . Hair bundle

5a. . . Brushed surface

6. . . Hair bundle

6a. . . Brushed surface

7. . . Hair bundle

7a. . . Brushed surface

8. . . Hair bundle

9. . . Hair transplanting department

10. . . Brush body

11. . . Grip

twenty one. . . Split hair

twenty two. . . Unit profile element

twenty three. . . Sheath

twenty four. . . Core hair

25. . . Sea department (sheath)

26. . . Island (core)

27. . . Cone

28. . . Bulge

29. . . Groove

A. . . Bonding layer

B. . . Interdental

d. . . The distance between the centers of the tufts

F. . . Silk fiber

N. . . Interdental gum

S. . . Gingival edge

t. . . Thickness of planting platform

w. . . Length of the width of the tooth

X. . . Axis of toothbrush

Fig. 1 is a perspective view showing a portion of a planting station according to an embodiment of the toothbrush of the present invention.

Fig. 2(a) is a front view of the toothbrush, and (b) is a plan view.

Fig. 3(a) is an enlarged front view of a portion of the planting station, (b) is an enlarged plan view, and (c) is an enlarged side view.

Fig. 4(a) is a plan view showing a portion of a planting station of another embodiment of the toothbrush, and Fig. 4(b) is a plan view showing a portion of the planting station of the other embodiment.

Fig. 5 is a schematic view showing a state in which the hair bundle of the toothbrush abuts against the interdental portion and the edge portion of the tooth.

Fig. 6(a) is an enlarged view of the end portion of the bristles, and (b) to (h) are sectional views of the fibers of the bristles.

Fig. 7(a) is a front view showing a bristles in which a plurality of core hairs are protruded at the front end, (b) is a perspective view thereof, and (c) to (e) are sectional views of a silk fiber having an island structure.

Fig. 8(a) is a perspective view showing another embodiment in which the bristles of the plurality of core hairs are protruded at the front end, and (b) is a sectional view of the fiber of the bristles.

Fig. 9(a) is a perspective view showing the bristles of the single core hair protruding at the front end, and (b) is a sectional view thereof.

Fig. 10(a) is a perspective view showing another embodiment in which the bristles of the single core hair are protruded at the distal end, and (b) is a cross-sectional view thereof.

Fig. 11(a) is a perspective view showing another embodiment in which a bristles of a single core hair are protruded at the tip end, and (b) is a cross-sectional view thereof.

Fig. 12(a) is a perspective view showing another embodiment in which the bristles of the single core hair are protruded at the distal end, and (b) is a cross-sectional view thereof.

Fig. 13 (a) to (c) are cross-sectional views of a silk fiber having a core-sheath structure in cross section.

1. . . toothbrush

2. . . neck

3. . . Planting station

3a. . . Hair surface

4. . . Hair bundle

5. . . Hair bundle

6. . . Hair bundle

7. . . Hair bundle

9. . . Hair transplanting department

10. . . Brush body

Claims (11)

A toothbrush characterized in that: a hair-planting table of a brush body made of synthetic resin is fixed with a plurality of hair bundles formed by synthetic resin bristles to form a hair-planting portion, and a part of the plurality of hair bundles is a bundle of hair bundles. The cross-sectional shape is substantially the same, and the distance between the centers of the tufts is substantially equal to the length of the tooth in the width direction, and is disposed adjacent to the axial direction of the toothbrush, and the cross-sectional shape is substantially the same. The integral tuft of the triangle is made from the side edge portion of the flocking table toward the axis of the toothbrush in the same direction, and the distance between the centers of the hair bundles is 1 The lengthwise direction of the teeth is substantially equal, and is adjacent to a straight line parallel to the axial direction of the toothbrush, and is disposed at a side edge portion of the flocking table, and is disposed between the pair of triangular cross-section bundles a tuft of an elongated section having a long axial direction of the toothbrush, and an outer edge of the outer side in the width direction of the tufting stage in the tuft of the elongated section is a ratio with respect to the pair of triangles The straight line connecting the hair bundles from the outer side in the width direction of the flocking table is located outside the width direction of the flocking table, and is disposed adjacent to the toothbrush so that the distance between the centers is equal to the length in the width direction of one tooth. The distance between the centers of the bundles of the same cross-sectional shape in the axial direction is 5 to 12 mm, and the bundle of the triangular cross-section is substantially triangular in shape from the side edge portion of the tufting table toward the axis of the toothbrush. The hair bundle of the triangular section has a cross-sectional shape inscribed in a circle having a diameter of 1.4 to 4.5 mm, and the bundle of the elongated section is located at a portion of the edge of the tooth at the boundary between the tooth and the gum, and the hair of the triangular section is The bundle does interfere with the interdental gums between the teeth on both sides, while at the same time cleaning the edges of the teeth and the interdental gums. The toothbrush according to claim 1, wherein the cross-sectional shape of the hair bundle of the elongated cross section is substantially quadrangular. The toothbrush according to claim 2, wherein the toothbrush having the same cross-sectional shape disposed in the axial direction of the toothbrush is formed so that the distance between the centers is substantially equal to the length in the width direction of one tooth. The bristles of the bundle are tip-finished. The toothbrush according to claim 3, wherein the bristles subjected to the tip-finishing process are subjected to a front end splitting process. The toothbrush according to claim 4, wherein the tooth bundle formed by the tip-finished bristles is closer to the axial center of the toothbrush, and is fixed by a generally pointed circular shape. The bundle of hair formed by the processed bristles. The toothbrush according to claim 5, wherein the bristles of the tip-finished bristles are substantially the same length or longer than the bristles to which the conventional tip-circular processing is applied. The toothbrush according to claim 6, wherein the bristle surface formed by the front end surface of the tuft has irregularities. The toothbrush according to claim 7, wherein the central portion of the front end surface of each of the tufts formed at the front end of the bristles is convex. The toothbrush according to any one of claims 1 to 8, wherein the hair bundle is fixed to the flocking table by heat. The toothbrush according to claim 9, wherein the number of bristles of the bundle of the triangular section and/or the number of bristles of the bundle of the elongated section is used to fix the bundle to the hair by heat Approximately an integral multiple of the count of the bristles when the device is removed by the same amount of bristles. The toothbrush according to claim 9, wherein the cross-sectional area of the bristles of the bundle of the triangular cross-section and/or the cross-sectional area of the bristles of the bundle of the elongated cross-section are determined by heat-fixing the tufts The device for taking out the same amount of bristles at the planting stage takes out a substantially integral multiple of the cross-sectional area of the bristles of the bristles.