JP5842480B2 - Single tuft brush - Google Patents

Description

  The present invention relates to a single tuft brush with a rounded tip end of a filament.

  As an interdental brush, fold a wire made of fine metal wires, place a plurality of filaments in parallel between them at right angles to the wire, twist the wire in this state, and a plurality of wires against the wire An interdental brush is widely practiced in which the filaments are held radially and then the filaments are cut into a columnar shape or a truncated cone shape.

  Moreover, as a toothbrush suitable for interdental cleaning, one hair bundle formed by bundling a plurality of filaments is planted in one flock hole provided at the tip of the handle portion, and the tip of the hair bundle is conical. The so-called single tuft brush, which is cut into a shape, is less harmful to the gingiva than the interdental brush, so it goes without saying that the healthy person does not need to brush the elderly or physically disabled It attracts attention because it can be safely used for cleaning assistance in the oral cavity of a person (for example, see Patent Document 1).

  As a method of planting the hair bundle, a plurality of filaments are folded in half, a metal flat wire is inserted inside the folded portion, and the filament is planted and fixed in the flock hole together with the flat wire, An application method for fixing a hair bundle with an adhesive by applying an adhesive to the proximal end portion of the hair bundle formed by bundling a plurality of filaments and inserting the hair bundle into a flock hole to which the adhesive has been applied By forming the molten lump at the proximal end of the hair bundle formed by bundling a plurality of filaments, and molding the handle in a state where the hair bundle is fixed so that the molten lump is arranged in the molding space of the handle , A method of planting by embedding and fixing the molten mass integrally with the handle, or forming a molten mass at the proximal end of a bundle of bundles of a plurality of filaments, and engaging with the molten mass by external fitting We know planting method to fix hair bundle to the tip of handle using fixing member And it has but a small number of manufacturing steps, are employed inexpensively because it can be manufactured, tying method using Tairasen wide.

  On the other hand, as a toothbrush, a toothbrush in which the tip of the planted hair bundle is ground with a grinder to round the hair tip has been proposed and put into practical use. Various devices have also been proposed for applying a tip round process to a toothbrush filament formed by cutting the tip of a brush portion into a triangular wave (see, for example, Patent Documents 2 and 3).

JP 2007-195713 A JP-A-11-318567 JP 09-313255 A

  In the single tuft brush described in Patent Document 1, since the tip of the hair bundle is formed in a conical shape, it is considered that rounding with a grinder is difficult, and with respect to the tip of each filament, The technology for applying the tip round process is not yet established. For example, Patent Documents 2 and 3 disclose a technique for rounding the bristles of a toothbrush, but the inventions described in Patent Documents 2 and 3 include two inclined surfaces at the peak portion of the tip of the brush portion. In the single tuft brush in which the tip portion of the hair bundle is formed in a conical shape as described in Patent Document 1, it is necessary to perform the rounded processing over the entire circumference of the conical portion. For this reason, it has been difficult to carry out the tip round processing using the techniques described in Patent Documents 2 and 3.

  An object of the present invention is to provide a single tuft brush capable of greatly reducing the damage caused by brushing by forming the filament into a small diameter to soften the hair and by rounding the tip of the filament. That is.

  The single tuft brush according to the present invention is a single tuft brush in which one hair bundle formed by bundling a plurality of filaments is planted in one flock hole provided at the tip of the handle portion, and the filament The diameter of the hair bundle is set to 0.076 to 0.15 mm, the hair bundle is implanted and fixed to the flock hole, the tip of the hair bundle is cut into a conical shape, and the tip of the filament is rounded. It has been processed.

  In this single tuft brush, since the tip of the hair bundle is cut into a conical shape, the insertion between the teeth can be improved and the interdental cleanability can be sufficiently secured as in the case of the conventional single tuft brush. . In addition, since the tip of the filament is rounded, the harmfulness can be reduced because it damages the gums. Furthermore, since the filament diameter is set to 0.076 to 0.15 mm, the hair can be softened and the damage caused by hurting the gums can be reduced. , The details between the teeth can be cleaned more cleanly. Therefore, it goes without saying that normal brushing is possible, and even when assisting toothbrushing for the elderly and people with physical disabilities, it can be safely used with reduced harmfulness due to damage to the gums, etc. It is possible to clean the space between teeth.

  Here, it is a preferred embodiment to set the diameter of the flock hole to 3.1 to 4.1 mm. If the diameter of the flocked hole is too large, the operability is lowered and hair loss is liable to occur. If the diameter is too small, the fluff is weakened and the cleaning property is lowered. Therefore, the diameter is 3.1 mm or more and 4.1 mm or less. It is preferable to set to.

  In a preferred embodiment, the maximum value of the hair length of the hair bundle exposed from the flock hole is set to 7.5 to 10.5 mm. If the maximum hair length is too large, the operability of the brush in the oral cavity will be reduced, and the hair and hips will be too soft and the wiping property will be reduced. Since it becomes strong, it is preferable to set it to 7.5 mm or more and 10.5 mm or less.

  The apex angle of the cone at the tip of the hair bundle in a side view of the hair bundle can be set to 20 to 65 °. If the apex angle is too large, the insertion property between the teeth is lowered, and if it is too small, the outer peripheral portion of the hair bundle does not contribute to cleaning and the cleaning property is lowered, preferably 20 ° or more and 65 ° or less, More preferably, it is set to 45 to 65 °, and most preferably 50 to 65 °.

  According to the single tuft brush according to the present invention, the tip of the hair bundle is cut into a conical shape. Can be secured sufficiently. In addition, since the tip of the filament is rounded, the harmfulness can be reduced because it damages the gums. Furthermore, since the filament diameter is set to 0.076 to 0.15 mm, the hair can be softened and the damage caused by hurting the gums can be reduced. , The details between the teeth can be cleaned more cleanly. Therefore, it goes without saying that normal brushing is possible, and even when assisting toothbrushing for the elderly and people with physical disabilities, it can be safely used with reduced harmfulness due to damage to the gums, etc. It is possible to clean the space between teeth.

Perspective view of single tuft brush II-II sectional view of FIG. Explanatory drawing of processing method of hair cutting Explanatory drawing of the processing method of round tip processing Explanatory drawing of other rounding methods Explanatory drawing of other rounding methods (A) of the tip of the rounded filament is a diagram showing a good processing state, (b) is a diagram showing a slightly strong processing, and (c) is a diagram showing an unprocessed state. Plan view of the toothbrush used in the test near the flocking table Bar graph showing the degree of pain to the gums with and without tip rounding Bar graph showing degree of hair hardness when brushed with or without rounded tip

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the single tuft brush 1 includes a handle portion 2 as a handle, a neck portion 3 connected to the distal end portion of the handle portion 2, and a hair bundle holding provided at the distal end portion of the neck portion 3. The handle 5 is composed of a portion 4, and the brush portion 8 is formed by fixing a single hair bundle 6 composed of a plurality of filaments 6 a to the hair bundle holding portion 4 of the handle 5 using a flat wire 7. Yes.

  The shape and size of each part of the handle 5 can be set to any shape and size as long as the handle 5 can be gripped and operated by hand. As the synthetic resin material constituting the handle 5, the same synthetic resin material as that of the toothbrush handle can be adopted, for example, polypropylene, polyethylene, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polytrimethyl terephthalate, polycarbonate, polyoxymethylene. Rigid synthetic resin materials such as styrene / acrylonitrile resin, acrylonitrile / butadiene / styrene resin, cellulose propionate, polyamide, polymethyl methacrylate, polyarylate and the like can be used. A thermoplastic synthetic resin is preferable, and a flexural modulus specified by JIS is preferably 1500 MPa or more. However, the handle 5 can be made of a single synthetic resin material, and the main body portion is made of a synthetic resin material, and the anti-slip portion is made of an elastomer. It can also be configured.

  The neck portion 3 is formed in a substantially circular cross section smaller than the handle portion 2 in order to sufficiently ensure the operability of the brush portion 8 in the oral cavity, and is configured to be elastically deformable so that the brushing pressure does not become excessively large. Yes.

  The hair bundle holding part 4 is formed in a bottomed cylindrical shape having a flock hole 9 and is integrally provided at the tip part of the neck part 3, and the center line of the hair bundle holding part 4 is substantially orthogonal to the center line of the neck part 3. Are arranged to be. However, the inclination angle of the center line of the hair bundle holding part 4 with respect to the center line of the neck part 3 can be set to an arbitrary angle of 90 ° or more and less than 180 °, but 90 ° in consideration of the operability of the brush part 8 and the like. It is preferable to set the angle to ˜150 °, preferably 90 ° to 130 °.

  The flocked hole 9 is formed in a circular cross section. However, it is also possible to configure the cross section to be elliptical, oval or square. The diameter D1 of the flocking hole 9 is appropriately set according to the diameter D2 and the number of filaments 6a to be implanted therein. However, if it is too large, the operability is lowered and hair loss is likely to occur, and is small. If it is too large, the hair becomes weak and the cleaning property is lowered. Therefore, it is preferable to set the thickness to 3.1 mm or more and 4.1 mm or less.

  The hair bundle 6 is formed by folding the filament 6a in half, inserting a flat plate-like metal wire 7 inside the folded portion, and planting and fixing it in the flock hole 9 together with the flat wire 7. When the hair bundle 6 is fixed using the flat wire 7 in this way, a molten mass is formed at the proximal end portion of the filament 6a, and the hair bundle 6 is arranged so that the molten mass is disposed in the molding space of the handle. By molding the handle in a fixed state, the molten lump is embedded and fixed integrally with the handle and planted, or the molten lump is formed at the proximal end of the hair bundle 6 formed by bundling a plurality of filaments. Compared with a planting method for fixing the hair bundle 6 to the distal end of the handle using a fixing member that fits and engages with the molten mass, or a planting method using an adhesive, it is preferable because .

  The filament 6a is made of a synthetic resin fiber material having a diameter D2 of 0.076 to 0.15 mm. The diameter D2 of the filament 6a is preferably set to 0.076 mm or more and 0.15 mm or less, because if the diameter is too large, the fur becomes stiff, and if the diameter is too small, sufficient fur cannot be obtained. By doing so, moderate hairiness can be obtained, harm can be reduced, such as damaging the gums, and the insertion between the details between the teeth can be improved, and the details between the teeth can be cleaned more cleanly.

  Examples of the synthetic resin material constituting the filament 6a include polyamide resins such as nylon and aramid resins, polyester resins such as polyethylene terephthalate, polytrimethylene terephthalate or polybutylene terephthalate, polyolefin resins such as polypropylene, thermoplastic elastomer resins, and others. Conventionally known thermoplastic resin filaments can be used. The cross-sectional shape of the filament 6a is preferably a circular shape, but filaments having various cross-sectional shapes such as a triangle and a quadrangle can also be adopted, and a composite filament having a core-sheath structure can also be used.

  The tip of the hair bundle 6 is cut into a conical shape, and the tip of each filament 6a is rounded to form a substantially semicircular shape. The apex angle θ1 of the cone in the side view of the tip of the hair bundle 6 is set to 20 to 65 °. If the apex angle θ1 is too large, the insertion property between the teeth decreases, and if the vertex angle θ1 is too small, the outer peripheral portion of the hair bundle 6 does not contribute to the cleaning and the cleaning property is decreased. Hereinafter, it is more preferable that the angle is set to 45 to 65 °, and most preferably 50 to 65 °.

  If the maximum value H of the hair length 6 of the hair bundle 6 exposed from the flock hole 9 is too large, the operability of the brush part 8 in the oral cavity is lowered, the hair and waist are too soft, the brushing property is lowered, and is too small. It is preferable to set the thickness to 7.5 mm or more and 10.5 mm or less, because the hair and hips become too hard and the stimulation to the gums becomes strong.

  In the present embodiment, the case where the present invention is applied to the manual single tuft brush 1 has been described. However, the present invention can also be applied to the electric single tuft brush 1. In this case, similarly to a known electric toothbrush, a replacement brush and a driving means for driving the replacement brush are provided. The replacement brush is provided with a neck portion 3 and a hair bundle holding portion 4, and one hair bundle holding portion 4 is provided. The hair bundle 6 is implanted to form the brush portion 8, and the brush portion 8 is vibrated or reciprocally reversed by the driving means.

Next, a method for manufacturing the single tuft brush 1 will be described.
First, the handle 5 is formed by injection molding using polypropylene as a synthetic resin material.

  Next, a necessary number of filaments 6a, for example, 200 filaments 6a are bundled and folded into two, and the flat wire 7 is arranged inside the bent portion, and this is then inserted into the flock holes of the hair bundle holding portion 4 9 is pushed into the flock hole 9 and fixed. The number of brush bristles used below means the number of filaments extending from the flocking hole 9 to the outside. As described above, the filament is bent into two and planted in the flocking hole 9. Two brush hairs are composed of filaments. Therefore, for example, when 200 filaments 6a are implanted, the number of brush hairs is 400.

(Hair cutting)
Next, as shown in FIG. 3, a bowl-shaped concave portion 10 is formed on the bottom surface, and a plurality of blades 11 are radially arranged on the inner peripheral surface of the concave portion 10 at intervals in the circumferential direction. Using a cutting device 14 having a cutting head 12 and a motor 13 that rotates the cutting head 12 about its axis, the recess 10 of the cutting head 12 is fitted to the tip of the bristle bundle 6 from above, and the cutting head 12 As shown in FIG. 2, the tip of the hair bundle 6 planted in the tuft hole 9 is cut into a conical shape by the blade 11 provided on the head. By this cutting, the tip of the filament 6a is obliquely cut into an acute angle as shown in FIG.

(Round tip processing)
Next, as shown in FIG. 7A, the tip of the filament 6a cut obliquely at an acute angle is rounded by the processing device 20 so that the tip of the filament 6a is substantially hemispherical. Apply. Specifically, as shown in FIG. 4, the processing device 20 includes a flat disc-shaped grindstone 21, a rotation driving means 22 that rotates the grindstone 21 around the center line C <b> 1 of the grindstone 21, and processing Revolution drive means 23 for revolving the grindstone 21 together with the rotation drive means 22 around the center line C2 of the hair bundle 6 of the single tuft brush 1 set so that the bristles 6 are vertically oriented with respect to the apparatus 20; The grindstone 21 is rotated and revolved while pressing the grindstone 21a of the grindstone 21 in contact with the conical surface of the bristles 6 substantially parallel or at a slight angle, thereby revolving the filament 6a. A tip rounding process is performed so that the front end portion of the lens becomes hemispherical. More specifically, after the polishing surface 21a of the grindstone 21 comes into contact with the tip of the filament 6a, the grindstone 21 is further lowered 3.5 mm to push the polishing surface 21a against the tip of the filament 6a. In addition, the grindstone 21 is rotated at 1200 rpm and revolved by about 8 revolutions in 2.5 seconds to perform a rounded end process. Note that, as in the processing apparatus 20A shown in FIG. 5, the revolution driving means 23 is omitted, and the bristles of the single tuft brush 1 are substantially perpendicular to the polishing surface of the grindstone 21 at the rotation center of the flat grindstone 21. The bundle 6 can be pressure-contacted to perform a tip round process, or, instead of the flat disc-shaped grindstone 21 of the processing apparatus 20 as in the processing apparatus 20B shown in FIG. A grindstone 21B is provided, and the grindstone 21B is rotated about the center line C1 by the rotation driving means 22 while the conical surface of the grindstone 21B is pressed against the conical surface at the tip of the bristles 6 of the single tuft brush 1. At the same time, the revolution driving means 23 can revolve the grindstone 21 </ b> B together with the rotation driving means 22 around the center line C <b> 2 to perform a tip round process.

  Next, a test performed to set the diameter D2 of the filament 6a, the diameter D1 of the flocked hole 9, and the maximum value H of the hair length will be described.

(Test on filament diameter)
First, a test performed to set a suitable diameter D2 of the filament in the single tuft brush will be described.
Seven types of filaments with different diameters D2, specifically, seven types of polybutylene with diameters D2 of 0.070 mm, 0.076 mm, 0.085 mm, 0.10 mm, 0.15 mm, 0.178 mm, and 0.2 mm A filament made of terephthalate was produced. Then, a filament is planted in a flock hole having a diameter D1 of 4.0 mm, and the tip of the planted filament is shaped into a predetermined shape so that the maximum hair length exposed to the outside from the flock hole is 7.5 mm. The tip of the filament that was cut and then hair-cut was subjected to a tip round process under the same conditions as the specific example in the tip round process of the above manufacturing method to produce seven types of single tuft brushes.

  Further, as shown in FIG. 8, the bristles 30 composed of the seven types of filaments are implanted using a flat wire on a toothbrush flocking table 32 having a flocking hole 31 of 3 rows and 8 columns having a diameter of 1.7 mm. The hair is cut so that the hair length exposed to the outside from the flock hole 31 is 9.5 mm, and the amount of pressing to the grindstone 21 and the polishing speed are the same as those for the rounded tip processing for the single tuft brush. The tip was rounded to produce seven types of toothbrushes.

  And after processing, arbitrary 20 filaments are extracted from the bundle of single tuft brushes and toothbrushes, and the end shapes of both ends are visually confirmed using a digital microscope, and the state is “◎”, “○ “×” was evaluated in three stages. Regarding the single tuft brush, 20 inspectors brushed for 3 minutes to inspect the hair removal of the single tuft brush after one use. The results are shown in Tables 1 and 2. However, as shown in FIG. 7 (a), the symbol “フ ィ ラ メ ン ト” represents a filament (brush hair) whose tip is well rounded into a substantially hemispherical shape, and the symbol “◯” represents that in FIG. As shown in b), the tip portion is processed into a taper shape having a length of twice or more the filament diameter D2, and represents a slightly strong filament (brush hair). As shown in c), it is assumed that the tip portion has substantially the same shape as that of the hair being cut, and represents a filament (brush hair) that is hardly processed. Moreover, in Table 1, the case where there was no hair loss and “x” was less than 30% was evaluated as “possible”, and the case where there was hair loss or “x” was 30% or more was evaluated as “impossible”. . In Table 2, the case where “x” was less than 30% was evaluated as “possible”, and the case where “x” was 30% or more was evaluated as “impossible”.

  From Tables 1 and 2, the single tuft brush has a pointed round shape that is good due to the tip rounding, or is slightly strong but can be practically used if the filament diameter D2 is 0.15 mm or less. Can be processed. However, when the filament diameter D2 is 0.070 mm, when 20 inspectors brushed for 3 minutes, hair loss occurred in the single tuft brush of 5 inspectors. The diameter D2 is preferably set to 0.076 mm or more and 0.15 mm or less.

  On the other hand, it can be seen that the toothbrush cannot obtain a good rounded shape unless the filament diameter D2 is set to 0.15 mm or more. This phenomenon is caused by the fact that the diameter of the flocked hole of the toothbrush is ½ or less of the diameter D1 of the flocked hole 9 of the single tuft brush. In the single tuft brush, the diameter D1 of the flock hole 9 is large, that is, the diameter of the hair bundle 6 is large, so that even if the diameter D2 of the filament is small, escape of the hair tip is prevented. It can be presumed to be due to the smooth rounding of the tip.

(Test on diameter of flock hole)
Next, a test performed to set a suitable diameter D1 of the flock hole in the single tuft brush will be described.

  A plurality of types of single tuft brushes having flock holes having different diameters D1 were manufactured. Specifically, seven types of handles 5 having diameters D1 of the flock holes of 2.2 mm, 2.8 mm, 3.1 mm, 3.5 mm, 4.0 mm, 4.1 mm, and 5.0 mm were manufactured.

  Then, a filament made of polybutylene terephthalate having a diameter D2 of 0.10 mm is planted so that the maximum hair length exposed from the follicle hole is 7.5 mm and the apex angle of the cone in a side view is 53 °. After cutting the tip of the bundle into a conical shape, the tip rounding was performed under the same conditions as the specific example in the tip rounding of the manufacturing method, and seven types of single tuft brushes were manufactured. And the shape of the front-end | tip part of a filament was evaluated by the method similar to the test regarding the diameter of the filament of the said single tuft brush. The results are shown in Table 3.

  As shown in Table 3, when the diameter D1 of the flock hole is 2.8 mm or less, the hair bundle is easily bent, the hair ends escape, and the number of untreated hair ends increases. It can be seen that setting is preferable. In addition, when the thickness is 5.0 mm or more, the hair becomes too strong, so not only the palatability is deteriorated, but also a strong force acts on the filament tip at the time of hair tip processing, and the tip shape after processing is not circular. In order to approach a sharp shape, it is preferable to set it to 4.1 mm or less.

(Test on hair length of hair bundle)
Next, a test performed to set a suitable maximum hair length H of the hair bundle in the single tuft brush will be described.

  As a handle, a handle having a flock hole having a diameter D1 of 4.0 mm was manufactured. Further, a filament made of polybutylene terephthalate having a diameter D2 of 0.10 mm was manufactured as a filament, and this was planted in the flock hole.

  And the maximum value H of the hair length in the hair bundle exposed from the flock hole is 5 mm, 7.5 mm, 8.5 mm, 9.5 mm, 10.5 mm, 13 mm, and the apex angle of the cone in the side view is 53 °. In this manner, the tip rounding was performed under the same conditions as the specific example of the tip rounding of the manufacturing method, and six types of single tuft brushes were manufactured. And the shape of the front-end | tip part of a filament was evaluated by the method similar to the test regarding the diameter of the filament of the said single tuft brush. The results are shown in Table 4.

  From Table 4, the maximum value H of the hair length is 5 mm, a strong force is applied to the tip of the filament during hair tip processing, and the tip of the filament has a sharp shape. Since it increases, it turns out that it is preferable to set to 7.5 mm or more and 10.5 mm or less.

Next, an evaluation test related to the feeling of use will be described.
As a single tuft brush, a handle having a flocking hole with a diameter D1 of 4.0 mm is manufactured, a filament with a diameter D2 of 0.1 mm is planted in the flocking hole, and the maximum value of the hair length in the hair bundle is 7.5 mm. And the tip of the hair bundle is cut so that the apex angle in side view is 53 °, and then the tip is rounded under the same conditions as in the tip rounding of the manufacturing method. A tuft brush and a single tuft brush without rounded tip were produced.

  And, for single tuft brush with rounded tip and single tufted brush without rounded tip, 30 inspectors evaluated the pain on the gums and the hardness of the hair when brushed. Each was judged by. The results are shown in FIGS.

From FIG. 9, it can be seen that the single tuft brush subjected to the rounded tip significantly reduces the gum pain compared to the single tufted brush not subjected to the rounded tip.
Also, from FIG. 10, the hardness of the polished hair is also softer on the whole with a single tuft brush with a rounded finish than a single tuft brush without a rounded finish. You can see that

  The embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and it goes without saying that the configuration can be changed without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Single tuft brush 2 Handle part 3 Neck part 4 Hair bundle holding | maintenance part 5 Handle 6 Hair bundle 6a Filament 7 Flat wire 8 Brush part 9 Flock hole 10 Recessed part 11 Cutlery 12 Cutting head 13 Motor 14 Cutting apparatus 20 Processing apparatus 21 Grinding stone 21a Polishing surface 22 Rotation drive means 23 Revolution drive means 20A Processing device 20B Processing device 21B Grinding wheel 30 Hair bundle 31 Flocking hole 32

Claims (5)

A single tuft brush formed by planting one hair bundle formed by bundling a plurality of filaments in one flock hole provided at the tip of the handle part,
The filament has a diameter of 0.076-0. 10 mm filaments made of polybutylene terephthalate are used,
A hair bundle made of the filament is implanted and fixed to a flock hole having a diameter of 3.5 to 4.1 mm ,
A conical surface formed by conically cutting the tip of the hair bundle planted and fixed in the flock hole is provided at the tip of the hair bundle so that the apex angle in a side view is 50 to 65 °. The tip of each filament is provided with a rounded portion formed by rounding the conical surface by polishing , and the maximum value of the hair length of the hair bundle exposed from the flocked hole is 7.5 to 10. Set to 5mm,
Single tuft brush characterized by that. A method for producing a single tuft brush in which one hair bundle formed by bundling a plurality of filaments is planted in one flock hole provided at the tip of the handle part,
A hair bundle formed by bundling filaments made of polybutylene terephthalate having a diameter of 0.076 to 0.10 mm is implanted and fixed to a flock hole having a diameter of 3.5 to 4.1 mm,
Next, the apex angle of the cone at the tip of the hair bundle in a side view of the hair bundle is 50 to 65 °, and the maximum value of the hair length of the hair bundle exposed from the flock hole is 7.5 to 10.5 mm. So that the tip of the hair bundle is cut into a conical shape,
Next, the tip of the filament was rounded by polishing,
A manufacturing method of a single tuft brush characterized by the above. In the round tip processing, the grindstone is rotated around the center line of the grindstone, and the grindstone is brought into contact with the tip of the filament while revolving the grindstone around the center line of the hair bundle, The method for producing a single tuft brush according to claim 2, wherein the tip of the filament is rounded by polishing . The said rounding process WHEREIN: A point rounding process is performed so that the front-end | tip part of the said filament may become a hemispherical shape, making the grinding | polishing surface of the said grindstone contact in parallel with the conical surface of a bristle bundle, and pressing. A manufacturing method of a single tuft brush. In the tip rounding process, after the grinding surface of the grindstone comes into contact with the tip of the filament, the grindstone is further lowered by 3.5 mm to press the grinding surface against the tip of the filament. The manufacturing method of the single tuft brush of Claim 3 or 4 which performs a round process.

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