Classifications

• • 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
  • A46B9/021—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups arranged like in cosmetics brushes, e.g. mascara, nail polish, eye shadow
• • 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
  • A46B3/18—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier the bristles being fixed on or between belts or wires
• • A—HUMAN NECESSITIES
  • A46—BRUSHWARE
  • A46B—BRUSHES
  • A46B2200/00—Brushes characterized by their functions, uses or applications
  • A46B2200/10—For human or animal care
  • A46B2200/1046—Brush used for applying cosmetics
  • A46B2200/1053—Cosmetics applicator specifically for mascara

Definitions

• the present invention relates to a brush intended for making up the eyelashes by means of an eyelash enhancing product also called mascara.
• the usual brushes of this type generally comprise relatively long bristles arranged in a helical sheet around a core constituted by a twisted wire. The importance of the stacking of the brush is measured by the number of bristles constituting a turn of the helical sheet of angular opening equal to 360 °.
• the helical ply of bristles generally had a pitch of about 2 mm and in the thickness of the ply, the bristles were substantially parallel. It appeared, however, that such brushes did not ensure, in use, a good distribution of the makeup product on the eyelashes. Indeed, in practice, the mascara is often placed on the eyelashes in packs, without any homogeneity, which requires the user to perform repeated brushing until obtaining an almost regular coating of the eyelashes.
• a mascara applicator generally comprises a mascara reservoir and a removable cap, which is intended to close the reservoir and which constitutes a handle making it possible to manipulate a makeup brush carried by the end of a rod integral with said cap.
• the rod and the brush which is associated with it, plunge into the tank; when the rod is removed from the reservoir, a certain amount of mascara is taken from the brush which can then be applied to the eyelashes.
• the brush enters the interior of the reservoir through a substantially circular orifice bordered by a flexible lip, the role of which is to exert a wringing action on the bristles of the brush in order to remove the excess product of makeup removed by the brush inside the tank.
• the diameter of this circular orifice is less than the diameter of the brush measured at the top of the bristles so that the flexible lip, which borders the orifice, can exert its action, of wiping during the extraction of the brush from the reservoir .
• the bristles of the brush being relatively flexible and being arranged with a relatively high density in the helical sheet of bristles, lie in the direction of the core at the time of the passage of the sheet through the wiping lip and, in this deformation, they go so far as to cause the "hairs" of the adjacent coil to become “coated", from which it follows that the makeup product tends to accumulate in the region of the brush situated just around the core.
• the helical sheet produced is a monolayer of bristles each arranged substantially radially and defining a regular helical surface. In such a monolayer sheet, it has been found that using the conventional industrial method of manufacturing brushes of this type, two adjacent bristles of the helical surface formed between them an angle which varied little, in particular by less than 20%, one hair to another from the surface.
• This unexpected phenomenon is particularly advantageous when choosing a number of turns per unit of brush length and an external diameter of the brush such that at the periphery of the brush, the ends of the brush bristles are practically all equidistant from each other. others with a small error percentage. It can of course be provided that this equidistance of the ends of the bristles is obtained only for an area of the brush, either that the brush comprises at least one conical zone, or that the brush is cut by milling in a zone of its peripheral surface lying substantially between two radial planes; in other words, the cross section of the peripheral surface of such a brush can have any shape.
• the conventional industrial manufacturing process of mascara brushes of this type consists, in a first step, in folding, with a hairpin, an iron wire; in a second step, to engage between the two branches of the hairpin a series of tufts of bristles which are brought into position by means of a comb whose edge is formed of successive slots, the bristles of the brush being arranged in said slots perpendicular to the mean plane of the comb; in a third step, to grasp the two ends of the hairpin thus loaded with tufts of hair and to cause a relative rotation of the ends so as to form the turns of the wire which constitutes the core of the brush.
• the bristles distributed in identical tufts over the entire length of the brush, slide over the core wire during twisting, so that the final distribution of the number of bristles per turn is regular from one end to the other of the brush.
• the present invention therefore has for its object a brush for applying mascara to the eyelashes, constituted by a core formed from a twisted metal wire, the twists of which trap the bristles of the brush, said bristles being arranged in a substantially regular manner between said twists, characterized in that the bristles have a cross section included in a circular envelope, the diameter of which is between 0.12 and 0.25 mm, the number of bristles per turn being between 5 and 9, said bristles forming substantially a single-layer helical ply, in which each bristle has a substantially radial orientation, the angle between two adjacent bristles of the ply being substantially constant to about 20%.
• the bristles of the brush according to the invention may have a cross section of any shape, and in particular a circular, square, rectangular, hexagonal, octagonal or oval section.
• the core wire has a diameter of between 0.2 and 0.9 mm; the pitch of a turn of the helical sheet is generally between 1.5 and 3.5 mm.
• the maximum diameter of the peripheral surface of the brush is advantageously between 5 and 12 mm; the peripheral surface of the brush is defined as being the surface on which all the ends of the bristles of the brush are found.
• the peripheral surface of the brush is cylindro-conical, conical, cylindrical or in the shape of a bud; advantageously, the cross section of the peripheral surface of the brush is then circular.
• the cross section of the peripheral surface of the brush is, at least in certain areas of the brush, defined by a curve whose distance from the trace of the core in said cross section is not constant.
• the conventional manufacturing process makes it possible to obtain a cylindrical brush, the peripheral surface of which is conformed as desired by grinding and / or milling.
• the ends of at least part of the bristles of the brush can therefore be ground to have the particular conformations which can be imparted by grinding at the ends of the bristles.
• the distance from the ends of two adjacent bristles of the helical sheet of bristles is substantially equal to the pitch of a turn of the helical sheet of bristles in said area.
• the number of bristles per turn is constant.
• the peripheral surface of which is a surface of revolution whose cross section has a variable diameter it can be provided that the number of bristles per turn is an increasing function of said diameter.
• the sizing of the brushes according to the invention is such that the minimum distance between the ends of 2 adjacent bristles is at least 0.8 mm, it being understood that this distance can vary over the same brush according to the shape and size of the peripheral surface of said brush.
• FIG. 1 schematically shows a side view of a turn of a brush according to the invention comprising 9 bristles per turn;
• FIG. 2 shows schematically the comb on which the hairs are put in place for the manufacture of the brush according to the invention as well as the hairpin wire, which comes to grip the hairs placed on the comb.
• a brush having 9 bristles per turn.
• the core of the brush consists of a twist of a wire 1 of circular cross section and diameter 0.5 mm. In their twist of wire are trapped by their central area hairs made of Nylon-6.10 having a solid circular cross section with a diameter of 0.15 mm.
• Each bristle is gripped in its central part by the twisted wire 1 and the set of bristles defines a single-layer helical sheet, the bristles being regularly spaced from each other, that is to say that 'A bristle 2 forms with the adjacent bristles an angle which is constant to within 20% all along the helical sheet formed.
• the manufacture of such a brush is carried out by the implementation of the conventional manufacturing process which is used industrially for all types of brush with twisted core.
• the core wire 1 is bent in the form of a hairpin. Tufts of bristles are placed in the slots 3a of a comb 3.
• the pin is made to slide constituted by the wire 1 relative to the comb 3, so that the protruding parts of the tufts of bristles 2 are positioned between the two branches of the pin, the plane of the two branches of the pin being substantially the median transverse plane of all the tufts of bristles 2.
• the desired brush has a length of 26 mm.
• a comb 3 was used, consisting of a 4 mm thick steel blade having 18 slots 3a each having a width of 1 mm, two successive slots being separated by rectangular teeth having a width of 0.7 mm.
• each of the slots approximately 12 bristles 2 are placed, each having a length of 20 mm, and the procedure is as indicated above to obtain a brush according to the invention.
• This brush has 20 turns and 9 bristles per turn; each turn of the helical sheet therefore occupies 0.5 mm along the length of the brush.
• the brush is ground or mowed to give it a cylindro-conical shape, the cylindrical part of which constitutes the peripheral surface part which has the maximum diameter; this maximum diameter is 7.5 mm.
• the ends of two adjacent bristles of the helical sheet are substantially 1.2 mm from each other ; this distance is substantially constant since the bristles 2 all have a substantially radial orientation and are spaced angularly from each other by a value of approximately -40 °, the variation of this angle all along the helical sheet being less at 20.
• the bristles of the brush are made of polyamide 6-10 as previously indicated but the bristles of the brush according to the invention can also be made of polyamide 6-6 or polyamide 6-12 or polyamide 6 or polyamide 11 or in polyester or polytetrafluoroethylene. These raw materials may or may not be added with agents improving the sliding and wettability characteristics of the material.
• the ends of the bristles 2 are substantially equidistant from each other on the cylindrical peripheral surface of the brush. It is very clear that this equidistance is no longer observed on the conical part of the peripheral surface of the brush since the outside diameter of the brush decreases while the number of bristles per turn is kept constant. In a variant, one could, of course, consider reducing the number of bristles per turn as the outer diameter of the brush is reduced on the conical part thereof so as to maintain the equidistance of the ends hairs.
• the makeup obtained with such a brush is of perfect quality because the eyelashes can penetrate between the bristles of the brush so that the brush performs a function of combing the eyelashes.
• the load of mascara product is smoothed over the entire length of the eyelash, taken in isolation, which makes it possible to have an eyelash lengthening effect.
• the load of makeup product on the eyelash can be high because the eyelash can penetrate the brush as far as the vicinity of the core, that is to say in the least wrung area of the brush, therefore in the area where the greatest amount of makeup is found.
• the constancy of the spacing of the bristles whatever the angle formed between the eyelashes and the axis of the brush makes it possible to obtain a perfectly homogeneous makeup.

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• Brushes (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9425473

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (29)

Family Cites Families (11)

• 1992
  • 1992-01-08 FR FR9200132A patent/FR2685859B1/fr not_active Expired - Lifetime
  • 1992-12-16 US US08/087,763 patent/US5370141A/en not_active Expired - Lifetime
  • 1992-12-16 CA CA002100346A patent/CA2100346C/fr not_active Expired - Lifetime
  • 1992-12-16 WO PCT/FR1992/001187 patent/WO1993013690A1/fr active IP Right Grant
  • 1992-12-16 DE DE69222036T patent/DE69222036T2/de not_active Expired - Lifetime
  • 1992-12-16 EP EP93902333A patent/EP0574572B1/de not_active Expired - Lifetime
  • 1992-12-16 ES ES93902333T patent/ES2106320T3/es not_active Expired - Lifetime

Non-Patent Citations (1)

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