Classifications

• • A—HUMAN NECESSITIES
  • A46—BRUSHWARE
  • A46D—MANUFACTURE OF BRUSHES
  • A46D1/00—Bristles; Selection of materials for bristles
  • A46D1/04—Preparing bristles
• • A—HUMAN NECESSITIES
  • A46—BRUSHWARE
  • A46D—MANUFACTURE OF BRUSHES
  • A46D1/00—Bristles; Selection of materials for bristles
• • A—HUMAN NECESSITIES
  • A46—BRUSHWARE
  • A46D—MANUFACTURE OF BRUSHES
  • A46D1/00—Bristles; Selection of materials for bristles
  • A46D1/02—Bristles details
  • A46D1/0276—Bristles having pointed ends
• • A—HUMAN NECESSITIES
  • A46—BRUSHWARE
  • A46D—MANUFACTURE OF BRUSHES
  • A46D1/00—Bristles; Selection of materials for bristles
  • A46D1/02—Bristles details
  • A46D1/0284—Bristles having rounded ends
• • 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
• • A—HUMAN NECESSITIES
  • A46—BRUSHWARE
  • A46B—BRUSHES
  • A46B3/00—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier
  • A46B3/16—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier by wires or other anchoring means, specially for U-shaped bristle tufts

Definitions

• the present invention relates to a toothbrush bristle with a tapered portion and a toothbrush containing such bristles.
• Korean Patent KR 261658 (corresponding to US-A-6090488) has described a toothbrush bristle having a tapered portion, the bristle having a diameter of 0.04 to 0.08 mm at the end of the tapered portion.
• the tapered part of this bristle was no longer "pointed" in the above sense.
• a bristle with a tapered part is described in which the diameter at the end of the tapered part is only 0.02 mm or less (this
• the present application has the object of providing an improved bristle with a tapered portion.
• a bristle for a toothbrush comprising: a) a cylindrical part with a maximum, constant cylinder diameter D zyl ; b) a first tapered part, adjoining the cylindrical part, with a bristle end and one of the ends
• the first tapered part has a length L of 10 mm or less and at least 3 mm measured on the central axis and from the piercing point; characterized in that the first tapered part in a measured on the central axis from the piercing point ⁇ nem distance X, which is the same size as the cylinder diameter D 2y i, a diameter D of 95 to 140 microns.
• the bristles according to the invention have a longer service life than the previously known sharpened bristles: according to the Applicant's findings, the sharpened ends buckle under the conditions described in US Pat Brushing occurring pressure, which leads in the course of time to a fatigue fracture of the bristle tip; This is avoided by the invention merely tapered (not pointed) bristle ends.
• the bristles according to the invention are so mechanically stable that they show on the buccal tooth surfaces a cleaning performance which is comparable or even slightly superior to cylindrical bristles.
• the bristles according to the invention are also more suitable for cleaning interdental spaces and proximal tooth surfaces than bristles with non-tapered filament ends, since the bristles according to the invention are better able to reach approximal tooth surfaces.
• D is in the range of 100 to 130 microns, more preferably in the range of 100 to 125 microns.
• the first tapered part of the bristle has a diameter of 120 to 160 ⁇ m in a distance of 1 mm measured from the piercing point on the center axis and a diameter of 90 to 135 ⁇ m in a distance of 0.1 mm measured in the same way on.
• the erfmdungsgemasse bristle is substantially (or as far as technically possible) rotationally symmetric about the central axis.
• the profile line of the tapered part of the bristle ie the diameter of the tapered part as a function of the decreasing distance from the piercing point of the center line of the bristle through the end face
• the term "monotonously decreasing" in the context of the present application has the usual meaning in mathematics. Rather preferred is the profile line of Tapered part in the mathematical sense to the point of penetration strictly monotone decreasing.
• the length of the tapered part (or, in the case of a U-shaped bent bristle according to the invention with two recessed parts, the length of both tapered parts) is preferably in the range of 6 to 10 mm.
• the end face of the end of the first tapered part has, at said piercing point, a surface normal, which is preferably inclined no more than about 30 ° C. towards said center line. This is usually the case automatically when the end face is formed by trimming a pointed end (see below); it may also be effected by suitable rounding treatment of the end face and its edges adjacent to the lateral surface of the tapered part (see below).
• a bristle having a cylindrical portion to which exactly one substantially rotationally symmetrical tapered portion of 10 mm or less in length adjoins (i.e., analogous to the unilaterally tapered bristle);
• a bristle having a cylindrical part and exactly two tapered, substantially rotationally symmetric parts, each 10 mm or less in length, which adjoin the cylindrical part on opposite sides (ie analogous to the double-pointed bristle), in particular the two tapered parts in essence are the same, and
• a bristle having a cylindrical portion, a substantially rotationally symmetrical tapered portion of 10 mm or less in length, and a substantially rotational symmetric tapered end, the tapered portion and tapered portion joining the cylindrical portion on opposite sides.
• any edges between the end face and the recessed part can be removed by rounding, as is the case with cylindrical bristles.
• the rounding can be carried out by conventional methods, e.g. B. using a sandpaper.
• Particularly preferred profile dimensions of the first tapered part are approximately according to the following profile tables I to 4.
• the diameters are given as a function of the distance from the point of penetration of the center line through the end face (mean values with scattering from 6 pieces of bristle each).
• the extreme right column of each table gives the maximum diameter of the cylindrical part (D zy i) of the bristle.
• diameter values are also indicated at a distance of 0.1 mm from the end face in order to exemplify the preferred course of the first tapered part of the bristle in the vicinity of the end face according to the invention.
• the diameter at the end face and at a small distance from the end face can no longer be reasonably measured. This is the case when the bristle end of the tapered part of a subsequent
• the erfmdungsgemassen bristles consist of a for
• Toothbrush bristles suitable plastic may preferably be made of a polyester, in particular one Polyester which is obtainable from (C 2 -C 4) -1, ⁇ -alkylene glycol and from terephthalic acid. More preferably, the polyester is polyethylene terephthalate (PET) or polybutylene terephthalate (PBT), and particularly preferred is PBT.
• PBT polyethylene terephthalate
• PBT polybutylene terephthalate
• they may consist of a polyamide, in particular of a polyamide obtainable from a (C 2 -Cs) -1, ⁇ -diamine and from a (C 2 -C 8 ) -1, ⁇ -dicarboxylic acid; Particularly preferred here is polyamide-6,6 (eg nylon).
• bristles For the production of bristles according to the invention, it can be assumed that commercially available bristles, which are tapered on one or two sides, or cylindrical bristles.
• bristles for example, Pragma, Shinyoung, Whessen, Hylon, Sogo, Best Whasung or Cheil Jedang were manufacturers of such bristles.
• Bristles according to the invention which have exactly one first tapered end, can be obtained, for example, from a commercially available unilaterally tapered bristle by trimming the pointed end while simultaneously forming the tapered end and the end face.
• the other, cylindrical end of the bristle may be cut to size accordingly.
• Bristles of the invention having a second tapered portion adjacent the first tapered portion may typically be formed from commercially available cylindrical bristles of suitable length by chemically etching the ends to the appropriate tapered or tapered shape , This etching process has been in the field of tapered bristles since long known.
• the tapered end can also be trimmed here to set a useful total length of bristle.
• two-sided sharpened bristles are commercially available, which need only be suitably trimmed at both ends to obtain a bristle according to the invention with two tapered parts and a length suitable for toothbrushes (see Example 1).
• the bristles can first be trimmed to a uniform length. Thereafter, they can be etched vertically immersed in an Atzpoundmaschine of typically 80 to 150 0 C.
• etching liquids are inorganic solutions, for example a strongly alkaline solution of atzalt (for example a 25-50% strength by weight aqueous NaOH or KOH solution) or a strongly acidic atz solution (eg 60-98%)
• etchant examples include organic solvents such as m-cresol, trifluoroacetic acid, o-chlorophenol, T ⁇ chlorphenol, DMSO, DMF, and a mixture of phenol and tetrachloroethane.
• the duration of the immersion may typically be 10 to 20 minutes, with the bristles optionally being able to be gradually withdrawn from the breath at a freely selectable, constant or time varying rate during this time, thereby increasing the profile of the end (ie monotony) of the breath Profllline) can be influenced.
• the ends may be washed with water, dilute base, dilute acid or a suitable solvent at room temperature and dried.
• the conditions of the etching can be chosen such that the diameter D of the tapered part after etching is just in the range of 100 to 140 ⁇ m according to the invention. For this purpose, the etching in a shorter
• the conditions of the etching can be selected such that a sharpened end first results, which is then trimmed to obtain the end face and the recessed part.
• the ends of the bristles may be trimmed additionally before the ends are rounded. Whether the ends need to be trimmed can be determined simply by observing the condition of the ends with a magnifier after they have been removed from the solution.
• the invention also provides a toothbrush with bristles according to the present invention.
• the bristles according to the invention can be inserted into the bristle carrier of a toothbrush analogously to the previously known one- or two-sided sharpened bristles.
• Bristles according to the invention with two tapered parts or with a tapered part and a sharpened part are in this case preferably bent in a U-shape and inserted in the bristle carrier by means of anchor plates.
• bristles according to the invention with only just one tapered part and one cylindrical part are preferably inserted into the bristle carrier in unconverted form by means of the process known in the jargon as "Anchor-Free Tufting".
• FIG. 1 shows a cross-section through a bristle according to the invention, wherein also the measuring parameters essential to the invention are indicated;
• FIGS. 2, 3 and 4 show three embodiments of the bristles according to the invention.
• FIGS. 5 and 6 show in vitro cleaning performance tests on black-colored, then TiC 2 -coated teeth with conventional cylindrical bristles according to the invention.
• Example 1 Production of bristles with two identical tapered parts according to the above profile tables 1 to 4
• Each of the initial bursts was trimmed at the two peaks in intervals as indicated above in the middle column.
• the ends of the thus-obtained tapered portions of the bristles were rounded using a TR89 Bristle Rounding Machine (manufactured by Tsujimura Co., Japan) with 240 mesh emery paper.
• FIG. 1 shows an end with a tapered part of a bristle according to the invention.
• the cylindrical part (1) On the right, the cylindrical part (1) is indicated, whose constant diameter at the same time means the maximum diameter D zy i of the bristle.
• the Cylind ⁇ step part (1) includes a tapered portion (21), whose taper at a distance L from the piercing point (6) of the central axis (5) by the end face (4) and extending strictly decreasing until End (3) extends.
• the end face (4) of the end (3) is shown here after an idealized rounding, that is formed approximately hemispherical; due to trimming and subsequent real rounding, this face could also be rather flat, but with more or less irregular or rugged edges.
• the diameter D essential to the invention is measured at a distance X from the piercing point (6), the distance X being equal to the said maximum diameter of the cylindrical part, D zy i.
• FIGS. 2-4 show three bristles according to the invention.
• the bristle is shown bent in a U-shape, just as the bristles in particular of FIGS. 2 and 3 would be planted in the bristle face of a toothbrush.
• the Um ⁇ bend takes place in the cylindrical part (1) which is then bent itself U-shaped.
• FIG. 2 shows a bristle according to the invention with two tapered parts (21, 22); in figure Figure 3 shows a bristle according to the invention with a first tapered part (21) and a pointed end (7); and Figure 4 is an inventive bristle is shown with only just ei ⁇ nem verjungten part (21), with the remainder of the bristle of a cylindrical part (1) is formed.
• This latter bristle could, unlike shown in Figure 3, are used in non-bent form in the bristle carrier of a toothbrush head.
• Figures 5 and 6 show tests for cleaning performance obtained in vitro on black-colored, then TiO ⁇ - coated teeth. Tested were:
• the standardized brushing operation consisted of 60 reciprocating movements with an amplitude of 30 mm; during vertical cleaning (in the figures the hatched parts of the beams) it consisted of 60 movements up and down with an amplitude of 8 mm; and in the circular cleaning (in the figures the dotted parts of the beams) it consisted of 60 circles of radius 4 mm with simultaneous 16 horizontal reciprocating movements with amplitude of 30 mm.
• the measured cleaning powers ie the proportion of removed TiO 2 , are indicated in arbitrary units.
• FIG. 5 shows the sum of the mean values of the cleaning powers after horizontal, vertical and circular cleaning movements with the bristles according to the invention (bar A) and with the conventional cylindrical bristles (bar B) in the case of the buccal tooth surfaces.
• FIG. 6 shows the sum of the average cleaning powers after horizontal, vertical and circular brushing movements with the bristles according to the invention (bar A) and with the conventional cylindrical bristles (bar B) in the mesial / distal tooth surfaces, i. at the tooth spaces facing tooth spaces.

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Priority Applications (8)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38529452

Family Applications (1)

Country Status (13)

Cited By (7)

Families Citing this family (3)

Citations (4)

Family Cites Families (3)

• 2008
  • 2008-05-08 MX MX2009012412A patent/MX2009012412A/es active IP Right Grant
  • 2008-05-08 EP EP08733833.1A patent/EP2146600B1/de not_active Not-in-force
  • 2008-05-08 WO PCT/CH2008/000212 patent/WO2008138158A1/de active Application Filing
  • 2008-05-08 RU RU2009146024/12A patent/RU2430668C2/ru not_active IP Right Cessation
  • 2008-05-08 BR BRPI0811598-2A2A patent/BRPI0811598A2/pt not_active IP Right Cessation
  • 2008-05-08 CA CA2687350A patent/CA2687350C/en not_active Expired - Fee Related
  • 2008-05-08 CN CN2008800247577A patent/CN101742943B/zh not_active Expired - Fee Related
  • 2008-05-08 MY MYPI20094859A patent/MY157768A/en unknown
  • 2008-05-08 US US12/600,355 patent/US20100154154A1/en not_active Abandoned
  • 2008-05-08 KR KR1020097025912A patent/KR101217311B1/ko not_active IP Right Cessation
  • 2008-05-08 AU AU2008250913A patent/AU2008250913B2/en not_active Ceased
• 2009
  • 2009-11-15 IL IL202146A patent/IL202146A/he not_active IP Right Cessation
  • 2009-12-14 CO CO09142795A patent/CO6251218A2/es active IP Right Grant

Patent Citations (4)

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