WO2021131527A1 - Brosse à dents - Google Patents

Brosse à dents Download PDF

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Publication number
WO2021131527A1
WO2021131527A1 PCT/JP2020/044647 JP2020044647W WO2021131527A1 WO 2021131527 A1 WO2021131527 A1 WO 2021131527A1 JP 2020044647 W JP2020044647 W JP 2020044647W WO 2021131527 A1 WO2021131527 A1 WO 2021131527A1
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WO
WIPO (PCT)
Prior art keywords
filament
root
filaments
tip
hairs
Prior art date
Application number
PCT/JP2020/044647
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English (en)
Japanese (ja)
Inventor
紗弥 森
明伸 黒田
晃大 石川
祥訓 竹内
Original Assignee
ライオン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ライオン株式会社 filed Critical ライオン株式会社
Priority to JP2021567111A priority Critical patent/JPWO2021131527A1/ja
Publication of WO2021131527A1 publication Critical patent/WO2021131527A1/fr

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    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B1/00—Brush bodies and bristles moulded as a unit
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B9/00—Arrangements of the bristles in the brush body
    • A46B9/02—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups
    • A46B9/04—Arranged like in or for toothbrushes
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • A46D1/04—Preparing bristles
    • A46D1/05—Splitting; Pointing

Definitions

  • the present invention relates to a toothbrush.
  • the present application claims priority based on Japanese Patent Application No. 2019-237281 filed in Japan on December 26, 2019, the contents of which are incorporated herein by reference.
  • the filament shape is such that the positions of the tips of the two bifurcated hairs are located on the outer circumference on the root side in the head portion surface direction.
  • a part of the outer peripheral surface is a surface perpendicular to the flocked surface, and the cross-sectional shape in the width direction intersecting the length direction of each branched hair is triangular. Further, the positions of the tips of the two bifurcated hairs are on the outer circumference on the root side in the direction of the head portion surface. Therefore, there is a problem that anisotropy occurs in the degree of bending of the filament during brushing, and the bending direction is limited. For this reason, the degree of bending of the filament becomes uneven, and it is not possible to sufficiently improve the feeling of contact with the gums and the feeling of cleaning.
  • One aspect of the present invention has been made in view of the above-mentioned problems of the prior art, and there is no limitation on the bending direction of the filament during brushing, and it is possible to improve the feeling of contact with the gums and the feeling of cleaning.
  • the purpose is to provide a toothbrush.
  • a brush portion composed of a plurality of filaments, a head portion having the brush portion on one surface side, a handle portion arranged on the rear end side of the head portion, the head portion and the head portion, and the like.
  • the filament has two or more bifurcated hairs on the tip side, and the cross-sectional area in the width direction intersecting the length direction of the filament is directed from the root to the tip.
  • Each tip of the two or more branched hairs is located inside the outer peripheral edge of the root of the filament in the width direction.
  • the cross-sectional shape of the filament may be axisymmetric with respect to the short axis and the long axis intersecting each other.
  • the cross-sectional shape of the root of the filament may have one or more recesses.
  • the filament may have one or more grooves continuous in the length direction from the root to the branch start point on the side surface thereof.
  • the distance between the tips of the two bifurcated hairs in one filament may be in the range of 51 to 99% of the maximum major axis width W1 of the root.
  • the toothbrush has a plurality of central filaments arranged in the width direction intersecting the length direction of the head portion and dividing the arrangement region of the inner filament into a plurality of pieces in the length direction, and the center thereof.
  • the hair length of the filament may be equal to the hair length of the outer filament.
  • the present invention it is possible to provide a toothbrush in which there is no limitation on the bending direction of the filament during brushing, and the feeling of contact with the gums and the feeling of cleaning can be sufficiently improved.
  • FIG. 1 is a perspective view showing the overall shape of the toothbrush of the first embodiment.
  • FIG. 2 is a top view showing the shape of the head portion of the toothbrush of the first embodiment.
  • FIG. 3 is a side view showing the shape of the head portion in the toothbrush of the first embodiment.
  • FIG. 4 is a front view showing the shape of the head portion in the toothbrush of the first embodiment.
  • FIG. 5 is a perspective view showing the shape of the filament of the first embodiment.
  • FIG. 6 is a side view showing the shape of the filament of the first embodiment.
  • FIG. 7 is a top view of the shape of the filament of the first embodiment as viewed from the flocked surface side.
  • FIG. 8 is a cross-sectional view showing the shape of the root of the filament of the first embodiment.
  • FIG. 9 is a perspective view showing the configuration of the brush portion of the toothbrush of the second embodiment.
  • FIG. 10 is a top view of the brush portion of the toothbrush of the second embodiment as viewed from the flocked surface side.
  • FIG. 11 is a cross-sectional view taken along the line BB of the toothbrush shown in FIG.
  • FIG. 12 is a diagram showing an arrangement example of filaments constituting the brush portion.
  • the toothbrush 10 of the present embodiment includes a brush portion 16, a handle body 14 having a head portion 11, a neck portion 12, and a handle portion 13.
  • the toothbrush 10 of the present embodiment has a brush portion 16 integrally molded with the head portion 11 by injection molding the handle body 14.
  • the handle body 14 includes a head portion 11 having a brush portion 16 on one surface side, a handle portion 13 arranged on the rear end side of the head portion 11, and a neck portion 12 connecting the head portion 11 and the handle portion 13.
  • the entire body including the head portion 11, the neck portion 12, and the handle portion 13 is integrally molded in a long shape.
  • the handle body 14 is obtained by injection molding using resin as a material, for example.
  • the material of the handle body 14 is polypropylene resin (PP), polyacetal resin (POM), polystyrene resin (PS), polyethylene terephthalate resin (PET), polybutylene terephthalate resin (PBT), acrylonitrile butadiene styrene resin (ABS), and pore.
  • PP polypropylene resin
  • POM polyacetal resin
  • PS polystyrene resin
  • PET polyethylene terephthalate resin
  • PBT polybutylene terephthalate resin
  • ABS acrylonitrile butadiene styrene resin
  • pore examples thereof include allylate resin, polypropylene resin, acrylonitrile styrene resin (AS), and polyester resin (PCTA).
  • PP, POM, and PBT are preferable, and PP and POM are more preferable, because they have high strength and excellent moldability.
  • PP is particularly preferable as the material of the handle body from the viewpoint that the effect of the
  • the above resins may be used alone or in combination of two or more.
  • the flexural modulus of the material of the handle body 14 is preferably 1200 to 3000 MPa, more preferably 1500 to 3000 MPa.
  • the amount of deflection of the head portion 11 can be set to an appropriate value, the cleaning power and operability in the oral cavity are improved, and the user's feeling of use is improved. It leads to the improvement of.
  • the flexural modulus of the material of the handle body is measured in accordance with JIS K7171.
  • the total length of the handle body 14 can be determined in consideration of the operability in the oral cavity of the user, for example, 150 to 200 mm.
  • the head portion 11 is a portion to be inserted into the oral cavity, and has a substantially rectangular shape and a rounded corner portion.
  • the head portion 11 may have a shape and size that makes it easy to wipe the inside of the oral cavity, and the shape is not particularly limited.
  • the shape may be such that the width gradually narrows from the base end side to the tip end side.
  • the brush portion 16 is provided on one surface (hereinafter, flocked surface) 11a side of the head portion 11 of the handle body 14, and has a plurality of brushes (hereinafter, filament 15) having the same shape. ..
  • the brush portion 16 is integrally molded with the head portion 11 of the handle body 14 separately produced by injection molding.
  • a cap type mode in which a separately molded brush portion is fitted to the handle portion and used may be used.
  • the plurality of filaments 15 constituting the brush portion 16 are provided in a grid arrangement linearly arranged in each of the width direction (Y direction) and the length direction (X direction) of the head portion 11.
  • the first region R1 located at the center in the width direction of the head portion 11 there are 22 rows in the length direction and 6 rows in the width direction, for a total of 132 filaments.
  • the pair of second regions R2 located on both outer sides of the first region R1 in the width direction there are 18 rows in the length direction and 2 rows in the width direction, for a total of 36 filaments 15.
  • the number of filaments 15 in the width direction on the front end and rear end sides of the head portion 11 is reduced. Improves sweepability in the oral cavity.
  • the brush profile of the brush portion 16 is flat.
  • all the filaments 15 constituting the brush portion 16 have the same shape, the hair lengths (height from the flocked surface 11a in the Z direction) are equal to each other, and the hair tips are aligned. Therefore, it has a flat brush shape in which the tips of the branched bristles 15A are aligned.
  • the gap (minimum distance between filaments) between the roots 15b of the filaments 15 adjacent to each other in the length direction and the width direction on the flocked surface 11a side is 0. It is preferably 1 mm or more, and more preferably 0.15 mm or more. Further, it is preferably 0.5 mm or less, more preferably 0.3 mm or less, and particularly preferably 0.25 mm or less. It is preferably 0.1 to 0.5 mm, more preferably 0.15 to 0.3 mm, and particularly preferably 0.15 to 0.25 mm.
  • gaps A between the roots 15b on the flocked surface 11a side of the filament 15 (FIGS. 2 and 3)" the portion having a gap A of 0.1 mm or more is provided on the flocked surface 11a.
  • 50 to 100% is preferable, and 75 to 100% or more is more preferable.
  • the brush portion 16 is made of a soft resin, and for example, a soft resin having a hardness of 90 or more on JIS K 6253 Shore A can be used. Specifically, a soft resin having a shore hardness A of 90 or more and a shore hardness D of 75 or less is preferable, and a soft resin having a shore hardness D of 66 is more preferable.
  • a soft resin having a shore hardness A of 90 or more and a shore hardness D of 75 or less is preferable
  • a soft resin having a shore hardness D of 66 is more preferable.
  • the soft resin constituting the brush molded product various elastomers can be used, but polyurethane is preferable.
  • the plurality of filaments 15 are not limited to a configuration in which a plurality of filaments 15 are arranged side by side in a grid pattern, but a configuration in which a plurality of filaments 15 are arranged side by side in a staggered pattern is also possible.
  • the filament 15 of the present embodiment is integrally molded with the head portion 11 by injection molding, and has a shape having two branched hairs 15A on the tip side.
  • the filament 15 is tapered in that the cross-sectional area in the XY plane intersecting the length direction (Z direction) continuously decreases from the root 15b toward each tip 15a of the two bifurcated hairs 15A.
  • each branched hair 15A is less than half the thickness on the base portion 15J (see FIG. 6) side. Therefore, the bristles of the branched bristles 15A are more likely to enter the narrow gaps such as the interdental portion and the cervical portion than the bristles of the unbranched filament.
  • the thickness of the base portion 15J is preferably 0.4 to 1.3 mm, more preferably 0.6 to 1.2 mm, and even more preferably 0.7 to 1.1 mm.
  • the "thickness of the base 15J" is defined as the diameter of the circumscribed circle on the outer periphery of the root 15b.
  • the filament 15 of the present embodiment has a gradient of the side surface 15j of the base portion 15J from the root 15b to the branch start position P and a gradient of the side surface 15k of the branch hair 15A from the branch start position P to the hair tip.
  • the angle is slightly different between and, and it has a two-step tapered surface.
  • the thickness of the branch start position P is preferably 0.3 to 1.2 mm, more preferably 0.5 to 1.1 mm, and even more preferably 0.6 to 1.0 mm.
  • the "thickness of the branch start position P" is defined as the diameter of the circumscribed circle on the outer periphery of the branch start position P.
  • the "thickness of the branch start position P" is smaller than the "thickness of the base portion 15J", so that it has a two-step tapered surface.
  • the ratio of the thickness of the branch start position P to the thickness of the base 15J is preferably 60 to 99%, more preferably 70 to 95%, further preferably 75% to 90%, and even more preferably 75 to 85. % Is particularly preferable.
  • the branch start position P is located substantially at the center in the length direction of the filament 15. Although it depends on the number of branched hairs 15A contained in one filament 15, if the length of the branched hairs 15A (hereinafter referred to as the branched length) is too long, it bends too much and interferes with other branched hairs 15A.
  • the branch length L2 is preferably set within the range of 20 to 80% of the total hair length (hereinafter referred to as filament length) L1 of the filament 15, more preferably 30 to 70%, and 40 to 60%. It is more preferably%.
  • the branch length L2 is a dimension from the branch start position P to the tip 15a.
  • the most preferable length L2 of the branched hairs 15A is 50% of the filament length L1.
  • the length L2 of the branched hair 15A is preferably 2.5 to 8.5 mm, more preferably 3.5 to 7.5 mm, and even more preferably 4.5 to 6.5 mm.
  • the filament length L1 is preferably 6 to 14 mm, more preferably 7 to 13 mm, and even more preferably 8 to 12 mm.
  • the shape of the filament 15 is axisymmetric with respect to the short axis X and the long axis Y that intersect each other.
  • the minor axis X of the filament 15 is parallel to the X direction, and the major axis Y of the filament 15 is parallel to the Y direction.
  • the cross-sectional shape of the filament 15 on the XY plane on the root 15b side has the narrowest minimum minor axis width W2 at the center of the maximum major axis width W1 and is in the Y direction from the branch start position P.
  • the shape is such that the width in the minor axis direction continuously expands toward both ends.
  • the maximum major axis width W1 at the root 15b is, for example, preferably in the range of 0.4 to 1.2 mm, more preferably in the range of 0.5 to 1.1 mm, and is 0.6 to 1.0 mm. The range is more preferable, and 0.7 to 0.9 mm is particularly preferable.
  • the minimum minor axis width W2 is preferably in the range of 0.2 to 0.6 mm, more preferably 0.2 to 0.5, and particularly preferably 0.25 to 0.4 mm.
  • the maximum minor axis width W3 is preferably in the range of, for example, 0.6 to 1.0 mm, more preferably 0.6 to 0.9, and particularly preferably 0.7 to 0.9 mm.
  • vertices Q and Q exist near the center of the pair of short axis side side surfaces 15f and 15f of the base portion 15J, respectively.
  • the cross-sectional shape of the filament 15 extends from the vertices Q of the pair of groove portions 19 and 19 and the minor axis side surfaces 15f and 15f of the base portion 15J to the pair of corner portions 15g and 15g existing on both sides of the groove portions 19 and 19, respectively. It is formed by a pair of tapered surfaces 19d and 19d that are inclined inward in the Y direction, respectively.
  • each of the short axis side side surfaces 15f of the base portion 15J is composed of a pair of tapered surfaces 19d that are symmetrical in the X direction.
  • the distance W4 (FIG. 8) between the pair of corner portions 15g located on both sides of each groove portion 19 is preferably in the range of 0.5 to 1.1 mm, more preferably in the range of 0.5 to 0.9 mm. The range of 0.55 to 0.65 mm is more preferable.
  • the pair of long axis side side surfaces 15e along the long axis Y of the filament 15 have the central portions of the width (hereinafter referred to as the long axis width) W1 along the long axis. Each is dented inward so that it approaches.
  • the filament 15 has a pair of groove portions 19 formed in a concave shape by the pair of long-axis side side surfaces 15e described above.
  • the cross-sectional shape of the groove portion 19, that is, the cross-sectional shape of the groove portion 19 along the XY plane of the filament 15 is substantially triangular.
  • the groove portion 19 has a pair of surfaces 19c that taper from the bottom portion 19b toward both outer sides in the Y direction with respect to the X direction.
  • the bottom portions 19b which are the deepest in the cross-sectional view, face each other at the central position of the major axis width, and each of them extends outward in the minor axis direction.
  • These pair of groove portions 19 are continuously formed from the root 15b to the branch start position P in the Z direction.
  • the cross-sectional areas of the XY planes of the grooves 19 may be equal to each other.
  • the XY cross-sectional areas of the pair of groove portions 19 decrease continuously from the root 15b toward the branch start position P, and even if the groove portion 19 on the root 15b side is the deepest. Good.
  • the degree of depth G of each groove 19 at the root 15b (for example, the degree of depth G of one groove 19 in the + X direction in FIG. 8) can be expressed by the following formula (1), and 10 to 45% is Preferably, 20-40% is more preferable, and 25-35% is even more preferable. 100x ⁇ (W3-W2) / W3 ⁇ / 2 ... (1)
  • the length of the depth G of each groove 19 at the root 15b can be expressed by (W3-W2) / 2, preferably 0.1 to 0.5 mm, more preferably 0.15 to 0.4 mm, and 0. 2 to 0.3 mm is more preferable.
  • the degree and length of the depth G of the other groove portion 19 located in the ⁇ X direction can be calculated in the same manner.
  • the bottom portions 19b of the pair of groove portions 19 gradually approach each other from the root 15b side toward the branch start position P, and communicate with each other in the minor axis direction on the tip side of the branch start position P.
  • two branched hairs 15A are formed on the tip end side of the filament 15.
  • the shape of the filament 15 is line-symmetrical with respect to the long axis Y passing through the center of W3. Therefore, when the filament 15 is viewed from the side as shown in FIG.
  • the position of the tip 15a of the branched hair 15A is located substantially at the center of the minimum minor axis width W2 of the filament 15.
  • the positions of the respective tips 15a of the branched hairs 15A when the filament 15 is viewed from above are inside the outer peripheral edge 15b1 of the root 15b of the filament 15 in the X and Y directions. Further, it is inside the outer peripheral edge 15b2 of the branch start position P in the X direction and the Y direction.
  • the distance (distance) W5 (FIG. 7) between the tips 15a of the two branched hairs 15A in one filament 15 is the length in the width direction along the long axis Y of the root 15b (hereinafter referred to as the long axis width) W1. It is preferably in the range of 51 to 99%, more preferably 55 to 80%, and particularly preferably 60 to 70%.
  • the distance W5 between the tips 15a of the two branched hairs 15A in one filament is preferably 0.3 to 1.0 mm, more preferably 0.4 to 0.8 mm, and 0.45 to 0.45 to 0.8 mm. It is particularly preferably 0.6 mm.
  • the minimum minor axis width W2 becomes 0 mm and branching starts.
  • the branches of the two branch hairs 15A have the same branch start positions P, and the roots of the two branch hairs 15A are connected by points. In this case, the distance between the roots of the two branch hairs 15A at the branch start position P is 0 mm.
  • the shape is not limited to the above, and for example, the minimum minor axis width W2 may not be 0 mm and the branching may be started.
  • the distance between the roots of the two branch hairs 15A at the branch start position P is preferably more than 0 to 0.3 mm.
  • the distance between the two branch hairs 15A at the branch start position P is preferably 0 to 0.3 mm.
  • the tip diameter at a distance of 0.1 mm from the tip of the branched hair 15A is preferably in the range of 0.02 to 0.5 mm, more preferably 0.02 to 0.4 mm, and 0.02 to 0.3 mm. Is more preferable, and 0.02 to 0.2 mm is particularly preferable.
  • the tip diameter at a distance of 0.1 mm from the tip is the diameter of the circumscribed circle on the outer peripheral edge of the cross-sectional shape in the XY plane intersecting the length direction (Z direction) of the branched hair 15A. Define.
  • the hair lengths (hereinafter referred to as branch lengths) of the two branched hairs 15A in one filament 15 may be equal to or different from each other.
  • branch length L2 If the branch length L2 is too long with respect to the filament length, it will bend too much during brushing, and it will be difficult to obtain a sufficient feeling of cleaning (cleaning feeling). On the contrary, if the branch length L2 is too short, it is difficult to bend at the time of brushing, and the accessibility to the interdental teeth and the comfort of hitting are deteriorated. Therefore, by setting the branch length within the above range, the feeling of wiping, the interdental insertability, and the feeling of contact with the gums are improved.
  • a parting line L extending in the Z direction exists in the center of the minimum minor axis width W2 on the minor axis side side surface 15f of the filament 15.
  • the maximum major axis width W1 on the root 15b side of the filament 15 is the maximum at the parting line L.
  • the toothbrush 10 of the present embodiment has a head portion 11 and a brush portion 16 integrally formed by injection molding the brush portion 16, and has a plurality of filaments 15 made of a soft resin.
  • the tip side of all the filaments 15 constituting the brush portion 16 has a shape branched into two, and when viewed from the upper side (flocked surface 11a) of the brush portion 16, the tip 15a of each branched hair 15A
  • the shape is located inside the outer peripheral edge 15b1 of the root 15b, and is line-symmetrical with respect to both the short axis X and the long axis Y. That is, all the lateral peripheral surfaces of the filament 15 are inclined with respect to the flocked surface 11a, and there is no portion perpendicular to the flocked surface 11a.
  • all the filaments 15 constituting the brush portion 16 have finely branched bristles, and each branched bristles 15A bends to exhibit cushioning properties. Since each branch hair 15A bends isotropically, it has an appropriate cushioning property regardless of the brushing direction, and it is difficult to feel pain when it comes into contact with the gums.
  • the entire filament 15 of the present embodiment is rooted while ensuring the maximum major axis width W1 of the filament 15 on the root 15b side by a pair of groove portions 19 formed from the root 15b to the branch start position P. It becomes easy to bend from 15b.
  • the interdental part and the cervical part can be efficiently cleaned by each branch hair 15A having a wide range of motion, and the tooth surface teeth are provided by the edge of the base portion 15J (hair belly) in which the root 15b is moderately bent. The dirt can be scraped off at the same time.
  • one filament 15 has a shape having a pair of groove portions 19, but it may have a shape having at least one groove portion 19, and has three or more groove portions 19. You may be.
  • the groove portion 19 is preferably provided continuously from the root 15b to the branch start position P, but may be partially provided. Further, it is preferable that the groove portion 19 is provided at least at the root 15b or a portion close to the root 15b.
  • the pair of groove portions 19 are provided on both sides in the minor axis direction of the root 15b, but may be provided on both sides in the major axis direction. When the number of grooves 19 is three or more, they may be provided in each of the minor axis direction and the major axis direction.
  • the distance W5 between the tips 15a of the two branched hairs 15A in one filament is within the range of 51 to 99% of the maximum major axis width W1 of the root 15b. Since it exists, it does not interfere with each other when the tips of the two bifurcated hairs in one filament 15 bend, so that it is easy to move, and the accessibility to the interdental region and the cervical region and the feeling of cleaning are improved. The hit feeling is also good.
  • the plurality of filaments 15 constituting the brush portion 16 are arranged at a distance of 0.1 mm or more from other adjacent filaments 15, it is possible to prevent the filaments 15 from interfering with each other during brushing. .. As a result, the movement of each filament 15 is not restricted, the accessibility of the hair tips to the interdental portion and the cervical portion is improved, and the feeling of cleaning can be further enhanced.
  • the toothbrush 20 according to the second embodiment of the present invention will be described.
  • the basic configuration of the toothbrush 20 of the present embodiment shown below is substantially the same as that of the first embodiment, but the shape of the brush portion 26 is different.
  • the brush profile has a flat brush shape, but in the present embodiment, the brush profile is not flat but has a brush shape having a step. Therefore, in the following description, the shape of the brush portion 26 will be described in detail, and the description of common parts will be omitted. Further, in each of the drawings used for the explanation, the same components as those in FIGS. 1 to 8 are designated by the same reference numerals.
  • the toothbrush 20 of the present embodiment has a plurality of outer filaments 151 arranged on the outermost periphery of the flocked surface 11a and a plurality of inner filaments arranged inside the plurality of outer filaments 151. It is composed of 152 and a plurality of central filaments 153 located at the center in the length direction and arranged in the width direction of the head portion 11.
  • the outer filament 151 and the central filament 153 have equal hair lengths to each other, and the inner filament 152 has a shorter hair length than the outer filament 151 and the central filament 153. Therefore, as shown in FIG. 11, the brush portion 26 of the present embodiment has a brush profile having a step on the bristles side.
  • the arrangement region of the inner filament 152 is divided into two in the length direction of the head portion 11 by the central filament group 153A, and these two regions surrounded by the outer filament group 151A and the central filament group 153A.
  • the plurality of outer filaments 151 and the plurality of central filaments 153 are arranged in two rows around the inner filament group 152A.
  • the overall hair length (filament length) of the inner filament 152 is shorter than the filament length of the surrounding outer filament 151 and the central filament 153.
  • the filament length of the inner filament 152 is 9 mm, and the outer filament 151, the central filament 153, and the inner filament 152 are combined.
  • the tip side of the brush portion 26 of the present embodiment has a concave shape with partially lowered bristles only at the two inner filament groups 152A. That is, on the bristles side of the brush portion 26, the head portion 11 has a concave shape formed by a step generated between the plurality of outer filaments 151, the plurality of central filaments 153, and the arranged inner filament group 152A. There are two in the length direction of.
  • the number of concave shapes in the brush portion 26 is not limited to two.
  • the central filament group 153A may be arranged at two positions at intervals in the length direction of the head portion 11. As a result, the arrangement region of the inner filament group 152A is divided into three, and three concave shapes are formed.
  • a concave shape having a different depth may be formed, and a brush profile having a plurality of steps may be obtained.
  • the central filament 153 may not be provided.
  • one concave shape is formed on the tip side of the brush portion 26 due to the step between the outer filament 151 and the inner filament 152 having a shorter hair length. It becomes the brush profile that has.
  • the depth of the concave shape that is, the difference in hair length (step) between the outer filament 151 and the center filament 153 and the inner filament 152 is not limited to 2 mm.
  • Table 1 is a diagram showing a difference in configuration between Examples 1 to 3 which are the configurations of the present invention and a comparative example of the conventional configuration.
  • Toothbrush samples of Examples 1 to 3 and Comparative Examples were prepared according to the specifications shown in Table 1, respectively.
  • (1. Position of the tip of the branched hair) Specifically, the positions of the tips of the two branched hairs as seen from the tips of the filaments are set to be inside the outer peripheral edge 15b1 of the root 15b in Examples 1 to 3, and on the outer peripheral edge of the root in the comparative example. (Position that overlaps with the outer peripheral edge).
  • Example 1 is “no groove”
  • the shape of Example 2 and Example 3 is “with groove (two)”
  • the shape of comparative example is “no groove”. The shape was taken.
  • Example 1 and Comparative Example have a shape without a continuous groove, and in Example 2 and Example 3, two grooves are formed from the root to the branch start position. It has a continuous shape.
  • the distance between the tips of the two branched hairs in one filament was 0.18 mm in Example 1, 0.5 mm in Examples 2 and 3, and 0.4 mm in Comparative Example.
  • the minimum distance between the plurality of filaments in the brush portion was set to 0.2 mm in Examples 1 to 3 and 0 mm in Comparative Example.
  • Example 6 (6. Brush profile)
  • the shape of the tip side of the brush portion and the brush profile were flat in Example 1 and Example 2, and in Comparative Example.
  • Example 3 in order to form a shape having two or more concave shapes having a step of 1 mm or more, in the arrangement of FIGS. 9 to 11, the hair lengths of the plurality of outer filaments 151 and the plurality of central filaments 153 are 11 mm and the inner filaments 152.
  • the hair length was 9 mm, and a step of 2 mm was provided between the outer filament 151 and the center filament 153 and the inner filament 152.
  • the average score of 10 specialized panels is " ⁇ (Very Good)", the average score is 4 points or more and less than 6 points is “ ⁇ (Good)”, and the average score is 3 points or more 4 Less than a point was designated as “ ⁇ (NotBad)”, and an average score of less than 3 points was designated as "x (Bad)”.
  • Example 3 As shown in FIG. 10, in the toothbrushes of Examples 1 to 3 in which the positions of the tips of the two bifurcated hairs on the filament are inside the outer peripheral edge of the root, the feeling of cleaning the interdental portion and the cervical portion is felt.
  • the sample of Example 3 having a brush profile having two or more concave shapes having a step of 1 mm or more the sample of Example 1 and Example 2 in which the sweeping profile was flat was compared with the sample of Example 1. , Higher evaluation was obtained.
  • Example 2 and Example 3 having two continuous grooves from the root to the branch start position gave a better evaluation of the comfort of hitting the gums than the sample of Example 1 having no groove. Obtained.
  • the sample of Example 2 having a flat sweep profile was highly evaluated.
  • Example 1 and Comparative Example having no groove the evaluation of the feeling of contact with the gums was low.
  • the sample of the comparative example in which not only there was no groove but also the tip position of the bifurcated hair was on the outer peripheral edge of the root the feeling of contact with the gum was very low.
  • the sample of Example 1 in which the tips of the two bifurcated hairs were located inside the outer peripheral edge of the root gave a slightly better evaluation than the sample results of the comparative example.
  • one filament 15 has a shape having two branched hairs 15A, but may have three or more branched hairs 15A. Further, among the plurality of branched hairs 15A in one filament 15, some or all of the branched hairs 15A may have different hair lengths. Further, branched hairs 15A having different thicknesses may be present in one filament 15. Further, at least the tip side of the branched hair 15A may be further branched.
  • the plurality of filaments 15 constituting the brush portion 16 may have an embodiment in which a lattice arrangement and a staggered arrangement as shown in FIG. 12 are combined.

Landscapes

  • Brushes (AREA)

Abstract

L'objectif de la présente invention est de fournir une brosse à dents avec laquelle il n'y a pas de restriction quant à la direction dans laquelle des filaments fléchissent pendant le brossage, et avec laquelle la sensation de contact avec les gencives et le sens de nettoyage peuvent être améliorés. Cette brosse à dents est pourvue d'une partie brosse comprenant une pluralité de filaments, une partie tête ayant la partie brosse sur un côté de surface, une partie manche disposée sur le côté d'extrémité arrière de la partie tête, et une partie col reliant la partie tête et la partie manche, les filaments ayant au moins deux poils ramifiés sur le côté d'extrémité de pointe ; la surface de section transversale de chaque filament dans un sens de la largeur croisant le sens de la longueur diminue en continu depuis la base vers l'extrémité de pointe ; et les extrémités de pointe desdits deux poils ramifiés sont positionnées vers l'intérieur, dans le sens de la largeur, du bord périphérique externe de la base du filament.
PCT/JP2020/044647 2019-12-26 2020-12-01 Brosse à dents WO2021131527A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001169827A (ja) * 1999-12-16 2001-06-26 Lion Corp 歯ブラシ
JP2003199626A (ja) * 2002-01-07 2003-07-15 Sunstar Inc 歯ブラシ
JP2005526555A (ja) * 2002-03-21 2005-09-08 コロネット−ベルケ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング ブラシ毛、これを製造する方法および装置、ならびにブラシ毛製品
JP2016209016A (ja) * 2015-04-28 2016-12-15 ライオン株式会社 歯ブラシ
JP2018110987A (ja) * 2013-04-01 2018-07-19 ライオン株式会社 歯ブラシ
US20180206627A1 (en) * 2015-07-07 2018-07-26 Colgate-Palmolive Company Oral Care Implement and Monofilament Bristle for Use with the Same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001169827A (ja) * 1999-12-16 2001-06-26 Lion Corp 歯ブラシ
JP2003199626A (ja) * 2002-01-07 2003-07-15 Sunstar Inc 歯ブラシ
JP2005526555A (ja) * 2002-03-21 2005-09-08 コロネット−ベルケ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング ブラシ毛、これを製造する方法および装置、ならびにブラシ毛製品
JP2018110987A (ja) * 2013-04-01 2018-07-19 ライオン株式会社 歯ブラシ
JP2016209016A (ja) * 2015-04-28 2016-12-15 ライオン株式会社 歯ブラシ
US20180206627A1 (en) * 2015-07-07 2018-07-26 Colgate-Palmolive Company Oral Care Implement and Monofilament Bristle for Use with the Same

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TW202123847A (zh) 2021-07-01
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