Product applicator and methods for its manifacture

Abstract: A method is provided for controlling the amount of product retained in different sectors along the longitudinal (14) axis of a cylindrical brush (1,50). The brush is drawn through an opening (11,62) having a different cross-section to that of the brush. Embodiments of the method described include the use of an axially profiled brush with a circular opening (11) and also the use of a cylindrical shaped brush with a non-circular opening (62). An embodiment of the profiled brush is divided circumferentially into a first sector (13) having bristles (5) of a first length, and a second sector (15) which is substantially free of bristles (5) of the first length. The second sector (15) may optionally comprise bristles (5') of a second, shorter, length. Also described is a package comprising a brush and a container, for performing the method, and manufacturing methods for a profiled brush.

Description: The present invention relates to a product applicator which is particularly, though not exclusively, for the application of a cosmetic product, especially mascara. Also disclosed are methods for manufacturing such a product applicator. Some cosmetic products are conventionally packaged in a small container equipped with a scraping element. A brush is normally integrally connected to a lid releasably attachable to the container. When the brush is withdrawn from the container, an internal radial lip of the scraping element is applied against the bristles of the brush to remove excess cosmetic product. For the same internal diameter, the scraping element, by being rubbed against the brush, is able to scrape off more excess product from a brush having long bristles that one with short bristles. On the one hand, short bristles, or the interstices between bristles, are needed to store the product that is to be applied, for example, to the user's eyelashes. On the other hand, long bristles are needed to properly comb and separate the eyelashes. There is also a need for a package that is capable of allowing a suitable amount of product to remain on a brush when the brush is withdrawn from the package. GB 2170996 discloses a mascara brush in which bristles of different lengths are arranged so as to facilitate the storage of mascara on the bush. US 5,551,456 discloses a mascara brush whose bristles are cut so as to provide two diametrically opposed helical channels in which mascara is stored. US 5,595,198 discloses a mascara brush whose bristles are cut along pre-determined paths so as to create a substantially helical groove through the brush section. According to one aspect of the invention, a process for manufacturing a cosmetics brush is provided according to claim 1. According to another aspect of the present invention, an apparatus for selectively ablating bristles of a cosmetics brush is provided according to claim 22. The invention shall be better understood with the aid of the following description and the attached drawings given by way of nonlimiting examples. DESCRIPTION OF THE DRAWINGS Figure 1 is a side view of a brush capable of being shaved off according to the process of the present invention; Figure 2 is a front view of a first embodiment of the brush according to the present invention; Figure 3 is a front view of a second embodiment of the brush according to the present invention; Figure 4 is a front view of a third embodiment of the brush according to the present invention; Figure 5 is a side view illustrating the shaving of bristles on the brush of Figure 1; Figure 6 is a side view illustrating a second example of the bristles shaving process according to the present invention; Figure 7 is a side view illustrating a third example of the bristles shaving process according to the present invention; Figure 8 is a side view illustrating a fourth example of the bristles shaving process according to the present invention; Figure 9 is a plan view of a first embodiment of the shaving device of Figure 8; Figure 10 is a plan view of a second embodiment of the shaving device of Figure 8; Figure 11 is a plan view of a third embodiment of the shaving device of Figure 8; Figure 12 is a front view illustrating a fifth bristles shaving example according to the present invention; Figure 13 is a front view of a brush passing through the center of a bristles ablation device according to the present invention; Figure 14A is a perspective view of a package according to the present invention together with a conventional brush; and Figure 14B is a view of the top of the package illustrated in Figure 14A and shows in more detail he configuration of the top of the package. The same reference numbers are used to designate corresponding components in Figures 1 to 14. DETAILED DESCRIPTION One embodiment of the process of the present invention comprises twisting a plastically deformable wire, typically of metal, so that it imprisons fibers within it, with the parts of the fibers projecting from the wire forming bristles in a helicoidal spiral, and of shaving off some of the bristles in predefined angular sectors by using the twisted wire to guide the components causing the total or partial ablation of the bristles. A tool chosen for ablation of the bristles is strong enough not to be damaged by the wire. Likewise, the tool does not destroy the wire by dislocating the brush. Guidance may be direct, mechanical, for example, by using a cutting tool such as a blade, milling tools or grinding wheel on the wire. In the case of "contact-free" ablation by laser beam, ultrasound, or water jet, guidance of the ablation tool is provided, for example, by a probe resting on the wire or by an automatic control device comprising a mechanism such as optical mechanism to detect the position of the wire. One mascara brush embodiment of the present invention is illustrated generally in Figure 1, which shows mascara brush 1 comprising one or more twisted wires 3 imprisoning bristles 5 forming a helicoidal spiral, where the bristles are distributed at regular angles. One end of the twisted wires 3 supports a lid 7 to seal container 8, the container being provided with scraping element 9. The outer envelope of the fiber of the brush, i.e. the three-dimensional shape defined by the tips of the fibers when the fibers are deployed to extend substantially radially from the twisted wires 3, may be in the form of a cylinder, cone, truncated cone, etc. When the lid 7 is screwed into the container, the bristles 5 are immersed in the mascara. At that time, the brush is overloaded with mascara. Its removal from the container causes the bristles 5 to pass through a circular lip 11 of the scraping element 9 that removes excess product. However, with a known type of brush, where all the bristles 5 have the same length, the scraping element 9 tends to remove too much product. A process according to the present invention permits the complete or partial ablation of some bristles 5 located in predetermined angular sectors. As a variant, ablation is performed in a helicoidal spiral. In the example illustrated in Figure 2, the brush according to the invention includes three sectors 13 of bristles 5 with angle α, preferably regularly distributed about axis 14 of wire 3 and separated by three sectors 15 with angle β preferably regularly distributed about axis 14 of wire 3, free of bristles, or as a variant, having shorter bristles 5'. The example illustrated in Figure 3 shows a brush 1 according to the invention comprising four sectors 13 of bristles 5 with angle α, preferably distributed at regular angles and separated by four sectors 15 with angle β preferably distributed at regular angles and free of bristles or having shorter bristles 5'. Figure 4 shows brush 1 according to the invention comprising six sectors 13 of bristles 5 with angle α, preferably regularly distributed about the axis 14 of wire 3 and separated by six sectors 15 with angle β, preferably regularly distributed about the axis 14 of wire 3 and free of bristles or, as a variant, having shorter bristles 5'. In the illustrated embodiment of Figure 2, the angle α is greater than the angle β. It is, however, foreseen that brushes may be produced in which the angles α and β are equal, or in which the angle β is greater than the angle α. It is well understood that brushes 1 compromising sectors 13 and 15 that are not distributed at regular angles as well as brushes compromising many sectors 13 with different angles α and/or β will not thereby exceed the scope of invention. Brush 1 according to the invention, as illustrated in Figures 2 to 4, when introduced in the mascara container is able to hold mascara in long bristles 5 of sectors 13 as well as in sectors 15 free of bristles or provided with shorter bristles 5'. When the brush is removed from the container, lip 11 of scraping element 9 primarily engages bristles 5 of sector 13 which are scraped clean while a significant amount of mascara is retained in sectors 15 free of bristles 5 or provided with shorter bristles 5', as well as in long bristles 5 in sectors 13 at the edges of sectors 15. The cosmetics brush according to the invention presents ideal conditions to ensure application of mascara on the user's eyelashes. In fact, the brush is supplied with a large amount of deposited mascara, while containing long bristles 5 that are capable of brushing, separating, and possibly curling the user's eyelashes at the same time as a uniformly thick layer of mascara is applied to give volume to the eyelashes. A process according to the invention for manufacturing brushes according to the invention will be described below. First, fiber such as polyamide, particularly polyamide-6.6 or other synthetic or natural fiber, whether hollow or solid, are distributed between two segments of wire 3, advantageously made of metal in the form of a U (hairpin wire). The wire is twisted into a helix to form a brush. Once the wire is twisted, the brush is advantageously cut so as to obtain the desired outer envelope of the fiber, cylindrical, for example, as illustrated in Figure 1. Then bristles 5 are subject to partial or total ablation in sectors 15. Advantageously, ablation of bristles 5 in all sectors 15 occurs simultaneously by using multiple cutting tools, specifically, blades. In the example illustrated in Figure 5, two blades 17 are positioned tangentially in relation to twisted wire 3 on which they rest in diametrically opposite areas. In the example illustrated in Figure 6, blade 17 is at an angle  not equal to zero in relation to the axis of twisted wire 3. For example, angle  is between 0° and 90°, and preferably between 5° and 45°. By shifting brush 1 in relation to blades 17 in the direction of arrow 19, bristles 5 are subject to ablation in areas Z known as future sectors 15. In addition to the horizontal motion indicated by arrow 19, blade 17 may be drive in a vibratory motion or in an oscillating straight line. The cut bristles in Figure 5 are indicated by the number 5''. The axial movement of blades 17 in relation to brush 1 advantageously proceeds over the entire length of the brush containing bristles 5. The fact that blades 17 are applied against wire 1 results in precise guidance and quick cutting. The length of the bristles cut will also depend on the rigidity of bristles 5. The distance between the blade or blades 17 and twisted wire 3 is advantageously very small, preferably nonexistent. Direct guidance of blades 17 is provided by twisted wires 3, or by means of a part such as a cylindrical part (not shown). It may be advantageous to guide brush 1 during its cutting. In Figure 7, such guidance is provided by tube 21 whose inner diameter is greater than the outer diameter of twisted wire 3 but less than that of brush 1 with deployed bristles 5, so that the fibers are bent to lie at acute angles relative to the axis of the twisted wire 3. Blades 17 are placed at the outlet of tube 21. Bristles 5 ensure that brush 1 is centred in tube 21. In a variant illustrated in Figure 8, tube 21 includes one or more openings 23, each of which permits passage of a cutting tool, in particular blade 17, toward the bristles to be cut. In the example illustrated in Figure 8, blade 17 forms an acute angle  with the axis of twisted wire 3. It is well understood that the use of a blade tangential to twisted wire 3 or, on the contrary, perpendicular to it is within the scope of the invention. In the illustrated example, the length of opening 23 is sufficient to permit deployment of bristles 5 before they are cut. In a variant, not illustrated, blade 17 is positioned in such a way as to cut bristles 5 bent by tube 23. Figures 9 to 11 show different shaped openings 23 in combination with different cutting tools. In Figure 9, tube 21 is provided with a wide opening 23 corresponding, for example, to ablation of a sector of the tube between 1/4 of the tube (90°) and 3/4 of the tube (270°), equal to half (180°), for example, along part of the length of tube 21. The edges 24 of opening 23 are advantageously cut so as not to hinder the cutting tool, in particular blade 17. Wide opening 23 in Figure 9 does not select the bristles 5 to be cut. On the contrary, in Figures 10 and 11, tube 21 contains a narrow opening 23, such as a slit, which selects the bristles 5 to be cut. Opening 23 advantageously presents an angular extension defined by two planes passing through the axis of tube 21 and through the edges of opening 23, corresponding to angle β of the corresponding sector 15. The ablation device for bristles 5 according to the invention advantageously includes a device, such as a piston type device, to cause the brush to advance in the direction of arrow 19 in relation to tube 21 and the cutting tool. For example, an automatic device introduces a brush in tube 21, and the piston causes it to advance until it is ejected form the outlet of the tube. The piston moves horizontally in reverse in order to permit a new brush to be inserted in the tube. The blade 17 is advantageously driven in a vibrating motion or, advantageously, in a horizontal motion according to arrow 26 perpendicular to arrow 19 as seen in Figures 9 and 10. In the variant illustrated in Figure 11, a circular saw, disk-shaped grinding wheel, or milling tool 25 penetrates opening 23 and causes ablation of bristles 5. In the preferred embodiment in Figure 11, tube 21 includes two diametrically opposite narrow first openings 23 (slots), each of which permits introduction of a first milling tool 25, each of which is driven in rotation according to arrow 27 by a motor 29. Tube 21 includes two other diametrically opposite openings 23 in areas axially shifted from and similar to the first openings 23, which are on a plane perpendicular to the plane including the first two opening 23. Grinding wheel 25 cuts bristles 5 in each of said openings 23. Grinding wheel 25 cuts bristles 5 off at the root where they emerge from wire 3. Two grinding wheels of the type used in model making may be used, in particular two grinding wheels containing hard aluminium oxide components. The guiding component, such as tube 21, may be replaced by a block, such as one in the shape of a rectangular parallelepiped containing a bore that is preferably cylindrical. In a variant illustrated in Figure 12, bristles 5 of brush 1 ensure that wire 3 is centred between blades 17 distributed at regular angles. In the illustrated example, three blades are used which are shifted longitudinally along axis 14 of twisted wire 3, whose projection on a plane forms an equilateral triangle. The areas of contact between the blades 17 and the twisted wire 3 correspond to sectors 15 in which the bristles are to be subject to ablation. It is well understood that the invention is not limited to the used of the blades 17 which shave off bristles 5. In the example illustrated in Figure 13, abrasive components are used, such as grinding wheels or milling tools 25 driven in rotation in the direction indicated by arrows 27 by motors 29. The axis of brush 1 is simultaneously driven in a horizontal motion perpendicular to the plane of Figure 13. Advantageously, several grinding wheels or milling tools are used simultaneously to form several sectors 15. In the illustrated example, three milling tools 25 form three sectors 15. In a variant, the milling tools 25 may be replaced in the equipment in Figure 13 by the blades of a circular saw. It should be noted that it is not a problem if milling tools 25 or grinding wheels 25 cut or grind the twisted wire 3 provided that any metal particles produced, that could be considered potentially dangerous to the user, are completely removed. Such metal particles may be removed, for example, by a blower device and/or by a magnetic field (not shown). In the example illustrated, grinding wheels 25 are disk-shaped and rotate about axes located in a plane perpendicular to axis 14 of twisted wire 3. In a variant, grinding wheels or milling tools 25 may be cylindrical in shape and their axial length may be advantageously equal to the length of the part of brush 1 provided with bristles 5, the axes of the grinding wheels being parallel to axis 14 of twisted wire 3. It is to be understood that the invention is not limited to the use of a twisted wire 3 with a straight axis 14. Six further embodiments of the brush will now be described. The first further embodiment has a semi-circular profile when viewed end-on along axis 14. Thus there is a single sector 13, subtending an angle α, and a single sector 15, subtending an angle β. The sector 13 is composed of one or more portions of a helicoidal spiral wherein each portion subtends an angle of α about the axis 14. As an example, α and β may both be substantially equal to 180°. The first further embodiment may be manufactured by performing a cutting operation, to produce the sector 15 after the wires 3 have been twisted about the axis 14. The cutting operation may, for example, be performed using the apparatus illustrated in Figure 6, in which a single cutting blade 17 cuts some of the fibres to produce a sector 15, subtending an angle of substantially 180°, in which the fibres are trimmed to the wires 3. Such an apparatus could be used as part of a manufacturing process in which discrete lengths of wires 3, and fibres, are trimmed by the cutting blade 17 or in which a continuous length of wires 3, and fibres, is trimmed by the cutting blade 17 for subsequent division into discrete lengths. The second further embodiment has a circular profile when viewed end-on along axis 14 although its transverse cross-section, at any point along the axis 14, substantially comprises a first semicircular sector, having fibres of a first length, arranged diametrically opposite a second sector, having fibres of a second length. The second further embodiment may be manufactured by offsetting the cut fibres to one side of the axis 14 when they are being inserted between the wire segments 3, prior to twisting the wire segments 3 together. Each of the cut bristles will be positioned asymmetrically in relation to the axis 14, so as to extend radially on each side of the axis by different amounts. When the wires are twisted together, the "longer" ends of the cut fiber form the sector 13, and the "shorter" ends of the cut fiber form the sector 15. If all of the cut fibers are similarly positioned in relation to the untwisted wires, then the first and second sectors 13 and 15 will each describe a helicoidal spiral along the axis 14. The third further embodiment has a profile when viewed end-on along the axis 14 comprising a sector 13, comprising fibre portions of a first length and subtending an angle α, and a sector 15, comprising fibre portions of a second length and subtending an angle β. As an example, α and β may both be substantially equal to 180°. The brush of this third further embodiment may also, as in the case for the second further embodiment, be produced by twisting the wires together with cut fibers each offset to one side of the axis 14. However, the third further embodiment differs from the second further embodiment by reversing the radial offset applied to adjacent groups of fibres. In this embodiment, first groups of cut fibers will have their "longer" ends to one side of the axis 14 of the untwisted wires, while adjacent groups of cut fibers will have their "longer" ends positioned on the other side of the axis 14 of the untwisted wires. Thus, before the wire segments 3 are twisted together, the profile of a series of adjacent groups of fibres will be castellated on both sides of the axis 14. When the wires 3 are twisted together, the "longer" ends of the cut fibers will form a sector 13, while the "shorter" ends of the cut fibers will form a sector 15. The length along the axis 14 of each of the groups of cut fibres preferably corresponds to half the helicoidal spiral pitch, in order to set α=β=180°. The fourth further embodiment has a profile when viewed end-on along the axis 14 comprising two sectors 13, each comprising bristles of a first length and each subtending an angle α, separated by two sectors 15, each comprising bristles of a second length and each subtending an angle β. To produce the brush of this fourth further embodiment, cut fibres of different lengths are used in separate, adjacent, groups of cut bristles disposed along the axis 14 of the brush between the untwisted wires. The cut fibers are each disposed symmetrically with respect to the axis 14 of the untwisted wires, but the cut fibers are of different lengths. Groups of cut fibers of a first, longer, length are positioned alternately with groups of cut fibers of a second, shorter, length. Preferably, the axial extent of each group is the same. When the wires are twisted together, the longer fibers form diametrically-opposed sectors 13, while the shorter fibers form diametrically-opposed sectors 15. As an example, if α=β=90°, then a 360° pitch of the helicoidal spiral along the axis 14 may comprise a first group of bristles, of the first length, followed by a second group of bristles, of the second length, followed by a third group of bristles, of the first length, followed by a fourth group of bristles, of the second length. The length along the axis 14 of each of the four groups of bristles is the same and is set so that, once entwined with the wire 3 about the axis 14, each group will correspond to 90° of the 360° of the helicoidal spiral pitch. The fifth further embodiment, like the fourth further embodiment, also comprises bristles of a first length and of a second length. However, whereas the fourth further embodiment comprises groups of bristles consisting solely of the first length alternating with groups of bristles consisting solely of the second length, the fifth further embodiment comprises groups of bristles consisting solely of the second length alternating with groups of bristles consisting of both the first and the second lengths. Two methods with which a brush according to the fifth further embodiment may be manufactured are: (i) performing an initial step of preparing first groups of bristles consisting solely of bristles of the second length and second groups of bristles consisting of both the first and the second lengths of bristles; performing a successive step of introducing, in alteration, the first and second groups of bristles between the wires 3 prior to the wires 3 being twisted into a helicoidal spiral; then performing a final step of entwining the wires 3 together into a helicoidal spiral so as to retain the bristles between the wires 3; and (ii) performing an initial step of introducing bristles of a first length and bristles of a second length between wires 3 prior to the wires 3 being twisted into a helicoidal spiral; performing a second step of entwining the wires 3 together into a helicoidal spiral so as to retain the bristles between the wires 3; then performing a final step of trimming the bristles of the first length to the second length in regions arranged periodically along the axis 14 of the entwined wires 3. The sixth further embodiment may have an arrangement of bristles according to any of the embodiments of the mascara brush hitherto described. The manufacturing process for the sixth further embodiment differs from those hitherto described in that instead of securing bristles between entwined wires 3, bristles are secured to a former so as to extend radially from a longitudinal axis 14 of the former, for example by using an adhesive. By virtue of this manufacturing process, bristles need only be attached to the former in the locations where they are to be placed, whereas in some of the manufacturing processes described hitherto, bristles are retained between wires 3 only to be subsequently cut off. In a favourable embodiment, cavities are provided in the periphery of the former so that tufts of bristles may be inserted into these cavities. In a particularly favourable embodiment, bristles are symmetrically or asymmetrically folded at their mid-point about keys, to form tufts, and these tufts are inserted into the cavities in the former such that the keys retain the bristles within the cavities. Another embodiment has bristles of a first and of a second length attached to the former. An alternative manufacturing process provides for the ablation of some or all the bristles after they have been attached to the former. The lip 11 of the scraping element 9 has been described as circular. As different sectors 13, 15 of the brush 1 have different bristle lengths, different amounts of mascara remain on sectors 13 and 15 after the brush 1 has been withdrawn from the package through the lip 11 of the scraping element 9. In an alternative embodiment of the invention illustrated in Figure 14A and Figure 14B a scraping element 9 has a non-circular opening 62 provided with a non-circular lip 65. The non-circular opening 62 comprises two diametrically opposed segments 15' of a first radius, r1, separated by two diametrically opposed segments 13' of a second, shorter, radius, r2. Figure 14 shows a container 60 according to an embodiment of the invention comprising a substance 61 to be applied by the brush, a scraping element 9, a non-circular opening 62 comprising segments 15' and 13' and also shows a brush 50 comprising a lid 7, a former 3 having a longitudinal axis 14, a cylindrical bristle region 52 at a peripheral portion of the former 3 extending axially of the longitudinal axis 14 and bristles 5 of a substantially uniform length attached to the former 3. The cylindrical bristle region 52 has a third radius, r3, measured radially of the longitudinal axis 14 of the former 3, which is intermediate between the first radius of the segments 15' and the second radius of the segments 13'. Thus, when the cylindrical bristle region 52 is withdrawn from the container 60 through the non-circular opening 62, bristles 5 in the sectors 15' will not be subject to a scraping action whereas the bristles 5 in the sectors 13' will be subject to a scraping action and will have some substance 61 removed. Other shapes may be used instead for the non-circular lip 65. For example, a square non-circular opening 62 would be suitable for use with a cylindrical bristle region 52 having its third radius, r3, intermediate the orthogonal dimension of the square and the diagonal dimension of the square. Thus the central portions of the sides of the square will scrape some substance 61 from the bristles 5 of the cylindrical bristle region 52 whereas the vertices of the square will not scrape any substance off the bristles 5. Another arrangement for the non-circular opening 62 is to use three or more sectors 15' with three or more sectors 13'. Another alternative is to have a single scraping sector 13' in conjunction with a single sector 15'. However, the use of a single sector 13' would result, when the cylindrical bristle region 52 is withdrawn from the container 60, in the cylindrical bristle region 52 being urged against the sector 15' with the result that the bristles 53 in the region corresponding to the sector 13' would be heavily scraped of any substance whereas those bristles 5 in the region corresponding to the sector 15' would be lightly scraped of any substance. The user, of a brush 50 in conjunction with a single scraping sector 13', may advantageously provide a counter-urging force to the brush 50 as it withdrawn from the container 60. It is also to be understood that although, in Figure 14A and Figure 14B, a non-circular opening 62 is shown in conjunction with a non-circular lip 65, another embodiment (not shown) has a circular opening with an iris (not shown) used to define a lip that is non-circular. In an additional embodiment of the invention, a brush 1 with a non-circular cross section transverse to the axis of its former, as illustrated in Figures 2, 3 and 4, may be used in conjunction with a non-circular opening 62. Examples have hitherto been given of embodiments of the invention in which a brush 1 has sectors of bristles of a first length 13 and a second length 15 and in which a non-circular opening 62 has sectors 15' of a first radius and sectors 13' of a second radius. In further embodiments of the invention the brush 1 may comprise a sector (not shown) having bristles of a third length intermediate the first and second lengths. Further embodiments of the non-circular opening 62 may comprise a sector (not shown) having a radius intermediate the first radius, r1 of a sector 15', and the second radius, r2 of a sector 13'. Other embodiments of the brush 1 and/or the non-circular opening 62 according to the present invention may further comprise sectors having further intermediate bristle lengths and/or radii, respectively. Additional embodiments of the brush 1 and/or of the non-circular opening 62, according to the present invention may, instead of having two or more discreet lengths and/or radii, respectively, have a continuum of lengths and/or radii intermediate to those of the first and second lengths and/or radii. The invention applies primarily to the cosmetics industry.

Claims: A process for manufacturing a cosmetics brush (1) comprising the steps of: securing a plurality of fibres to an elongate core (3); and cutting said fibres in at least one angular sector (15) about the longitudinal axis (14) of said core (3) using a cutting tool (17) characterised in that said cutting tool (17) is guided by said core (3) during cutting of the fibres. A process according to claim 1 wherein the step of securing a plurality of fibres to a core (3) is characterised by the steps of: providing two lengths of plastically deformable wire; positioning a plurality of fibres between the two lengths of plastically deformable wire; and entwining the two lengths of plastically deformable wire to form said core (3) imprisoning said fibres between said two lengths of plastically deformable wire. A process according to claims 1 or 2 wherein the parts of the fibres projecting from the core (3) form bristles (5) arranged in a helicoidal spiral. A process according to claim 3 wherein said cutting tool causes partial ablation of bristles (5') in at least one angular sector (15). A process according to claim 3 wherein said cutting tool (17) causes total ablation of bristles (5') in at least one angular sector (15). A process according to any of claims 3 to 5 wherein multiple cutting components (17) simultaneously make several sectors (15) that are free of bristles. A process according to any of claims 3 to 5 wherein multiple cutting components (17) simultaneously make several sectors (15) that contain bristles (5') of a shorter length than bristles (5) in sectors (13) where said cutting step is not performed. A process according to claim 6 or claim 7 wherein said multiple cutting components (17) are distributed regularly about the longitudinal axis (14) of said core (3). A process according to claim 8, characterized by including a step of centering the brush (1) between multiple cutting components (17) positioned regularly about the longitudinal axis (14) of the brush (1). A process according to any preceding claim wherein the cutting component (17) is a blade with a cutting edge. A process according to claim 10, characterized in that the cutting edge of the blade (17) is aligned tangentially to the core (3). A process according to any of claims 2 to 11, wherein the brush (1) is introduced into a tube (21) having a bore having an outlet of inner diameter greater than the diameter of the core (3) and smaller than the diameter of the brush with deployed bristles (5), so that said bristles (5) are bent towards the axis of the core (3) and said brush (1) is centred within said tube (21). A process according to claim 12, characterized in that the blades (17) are positioned at the outlet of the bore (21). A process according to claim 13, characterized in that the tube (21) includes at least one lateral opening (23) permitting application of one or more of the cutting tools (17,25) to the brush (1) whose bristles (5') are to be shaved off. A process according to claim 14, characterized in that said opening (23) is a circumferentially narrow opening which presents to said cutting tool an angular sector (15) of said brush (1) in which ablation of the bristles (5') is to take place. A process according to claim 15, characterized in that each of a plurality of openings (23) presents an angular sector (15) of said brush (1) to a separate cutting tool (25). A process according to claims 14 to 16 wherein said tool (25) is a rotary tool chosen from among a circular saw, a milling tool, and a grinding wheel. A process according to claim 17, characterized in that rotary tool (25) penetrates the circumferentially narrow opening (23). A process according to claim 17 or claim 18, characterized in that the rotary tool (25) is disk-shaped and that its edge is applied to the plastically deformable twisted wire (3). A process according to claim 2 wherein said plastically deformable wire is metallic. A process according to claim 2 or claim 20 wherein said two lengths of plastically deformable wire are joined together at one end. An apparatus for selectively ablating bristles of a cosmetics brush (1) comprising an elongate core (3) of a first diameter and radially-extending bristles (5) extending outwardly from the core (3) to a second diameter, the apparatus comprising: a tubular passageway (21) of a diameter greater than said first diameter but less than said second diameter; at least one lateral opening (23) communicating with the interior of the passageway; a cutting element (17) extending through the lateral opening (23) toward the centre of the passageway and arranged to ablate bristles (5') in at least one angular sector (15) about the longitudinal axis (14) of said brush (1) when said brush (1) is positioned within the passageway (21). An apparatus according to claim 22 wherein said cutting element (17) is arranged to cause partial ablation of bristles (5') in at least one angular sector (15). An apparatus according to claim 22 wherein said cutting element (17) is arranged to cause total ablation of bristles (5') in at least one angular sector (15). An apparatus according to any of claims 22 to 24 wherein multiple cutting elements (17) are arranged to simultaneously make several sectors (15) that are free of bristles An apparatus according to any of claims 22 to 24 wherein multiple cutting elements (17) are arranged to simultaneously make several sectors (15) that contain bristles (5') of a shorter length than bristles (5) in sectors (13) which are not arranged to be cut by said cutting element (17) An apparatus according to claim 26 wherein said multiple cutting elements (17) are distributed regularly about the longitudinal axis (14) of said core (3). An apparatus according to claim 27, wherein the brush (1) is arranged to be centred between multiple cutting elements (17) positioned regularly about the longitudinal axis (14) of the brush (1). An apparatus according to any of claims 22 to 28 wherein the cutting element (17) is a blade with a cutting edge. An apparatus according to claim 29 wherein the cutting edge of the blade (17) is arranged to be tangential to the core (3) of said brush (1) when said brush (1) is positioned within said passageway (21). An apparatus according to claim 29 or 30, wherein the blades (17) are arranged to be positioned at the outlet of the bore (21). An apparatus according to claim 22, wherein each of a plurality of openings (23) presents to a separate cutting tool (17,25) an angular sector (15) of said brush (1) in which ablation of bristles is arranged to take place. An apparatus according to claim 32 wherein said tool (25) is a rotary tool chosen from among a circular saw, a milling tool, and a grinding wheel. An apparatus according to claim 33, characterized in that the rotary tool (25) is disk-shaped and that its edge is arranged to be applied to the core (3). An apparatus according to claim 21 wherein said core (3) comprises two lengths of entwined plastically deformable wire. An apparatus according to claim 35 wherein said two lengths of plastically deformable wire are joined together at one end. An apparatus according to claims 21 or 36 wherein said core is metallic.

Inventors: MATHIEZ JEAN-LOUIS, MATHIEZ, JEAN-LOUIS
Applicants: COTY S A, COTY S.A.
Application year: 2000
Main classification: A46B9
IPC codes: A46B3, A46B9