This invention relates to cosmetic applicator brushes having defined zones, each zone having either a fixed or a variable pitch between adjacent fibre arrays located therein, and to a method of manufacturing such brushes.
Cosmetic applicator brushes, and in particular mascara applicator brushes are typically twisted wire brushes. During manufacturing, a multiplicity of fibres is retained between two sides of a stem pin that has been bent and folded back on itself. Once the multiplicity of fibres is in place, the stem pin is then twisted. The twisting of the stem pin causes the multiplicity of fibres to become helicoidally distributed into helicoidal fibre arrays. Typically, in a standard mascara applicator brush, the distance between corresponding points on adjacent fibre arrays, also know as the pitch, is fixed along the length of the brush.
The pitch between adjacent fibre arrays in the assembled brush defines a fibre distribution array. The fibre distribution array affects the amount of mascara that can be loaded onto the brush, and therefore mascara application (both in amount and distribution) is affected. A more tightly twisted brush tends to load less mascara than a brush that is not as tightly twisted. Due to the fact that the pitch between adjacent fibre arrays in standard, assembled cosmetic applicator brushes is fixed along the entire length of the assembled brush, the amount of product loaded by the brush is substantially the same. As a result, the amount of mascara that can be applied by various regions of the brush cannot readily be varied.
It is an object of the invention to provide for a cosmetic applicator brush with defined zones, each zone having either a fixed or a variable pitch between adjacent fibre arrays located within the zones, and to a method of manufacturing such brushes, which at least in part obviates the problems stated above.
In accordance with a first aspect of the invention there is provided a cosmetic applicator brush comprising:
In an embodiment, the at least first pitch is less than the at least second pitch. Alternatively, in another embodiment, the at least first pitch is greater than the at least second pitch.
In an embodiment, a plurality of pitches between adjacent fibre arrays located within the first zone is defined. Alternatively, in another embodiment, a plurality of pitches between adjacent fibre arrays located within the second zone is defined.
In one version, the pitch between adjacent fibre arrays within a zone varies linearly.
In accordance with a second aspect of the invention there is provided a method of manufacturing a cosmetic applicator brush comprising:
In an embodiment, the multiplicity of fibres is retained in a uniform distribution such that the distance between adjacent fibres is fixed, so as to define a uniform distribution of fibre arrays extending from the twisted stem pin.
Alternatively, the multiplicity of fibres is retained in a non-uniform distribution such that the distance between adjacent fibres is variable, so as to define a variable distribution of fibre arrays extending from the twisted stem pin.
In an embodiment, the stem pin, in the primary twisting step, is twisted between 11 and 18 times.
In an embodiment, the stem pin, in the secondary twisting step, is twisted between 1 and 4 times.
In an embodiment, the fibre arrays are trimmed after the secondary twisting step. Alternatively, the fibre arrays are trimmed before the secondary twisting step.
a to 1d show side views of various embodiments of a cosmetic applicator brush according to the invention;
In
The pitches P1 and P2 differ, so that the pitch between adjacent fibre arrays varies between the first zone (16) and the second zone (18). The cosmetic applicator brush (10) is generally mounted to a cap (20). The cap (20) can be used as a handle when a user applies the mascara product to their eyelashes. As is well known, the cap (20) can be used to close a container (not show) containing the mascara product when the mascara product is being stored, thereby preserving the mascara product.
In one version, as shown in
In an alternate brush (22), as shown in
Referring now to
In yet a further version, a brush (28), as shown in
Although not shown, it is envisaged that a cosmetic applicator brush with at least two zones, one of the zones having a variable pitch between adjacent fibre arrays and the other zone having a constant pitch between adjacent fibre arrays, may also be manufactured.
In
As shown, the fibres (82) are placed between the two sides of the stem pin (80) in a uniform manner so that the fiber density along the applicator brush length is constant. Alternatively, the fibres (82) may be placed between the two sides of the stem pin (80) in a non-uniform manner so that the fiber density along the applicator brush length is variable. Where a uniform distribution of fibres is used, and the stem pin (80) is twisted, according to the twisting steps explained below, a constant pitch will be defined between adjacent fibre arrays within a defined fibre zone. Conversely, where a non-uniform distribution of fibres is used, and the stem pin (80) is twisted, the pitch between adjacent fibre arrays within a defined zone will vary. To achieve a non-uniform distribution of fibres within the stem pin (80), the fibres (82) can either be re-arranged within the stem pin (80) prior to the twisting of the pin, as described below, or additional fibres can be added to a certain region of the stem pin (80) such that there are more fibres within that region.
In a primary twisting step (103), the stem pin (80) is twisted, in a rotational device, to form a twisted stem pin (86). The rotational device grips both ends (81) of the stem pin (80) and then rotates and twists the stem pin (80). The stem pin (80) is generally twisted between 12 and 20 times, when a cosmetic applicator brush of 25 mm is produced. It has been found that when the stem pin (80) is twisted less than 11 times the multiplicity of fibres (82) are not anchored sufficiently, and may fall loose. Conversely, when the stem pin (80) is twisted more than 20 times, the stem pin (80) tends to crush the fibres (82). Clearly, if the stem pin (80) is twisted 20 times during the primary twisting step (103), secondary twisting, which will be described further below, will not be possible (if a 25 mm brush is being produced) as this will result in damage to the multiplicity of fibres (82). As such, the stem pin (80) is generally twisted between 11 and 18 times during the primary twisting step (103). It is envisaged that more or less twists may be applied in the primary twisting step (103) when cosmetic applicator brushes of different lengths are produced.
In a fixing step (105) a first region (87) of the twisted stem pin (86) is clamped using a clamp (88). The clamping of the first region (87) prevents the first region (87) from rotating and twisting further during subsequent steps of the manufacturing method. The first region (87) thus defines a first zone of an assembled cosmetic applicator brush, corresponding to the first zone (16) shown in
It is also envisaged that, where a cosmetic applicator brush having more than two regions is to be manufactured, more than one clamp (88) may be used. Where more than one clamp (88) is used, at least one fixed region will be defined between the clamps. The fixed region will thus be unable to rotate during subsequent twisting steps, and the regions which are not fixed will be able to twist in further twisting steps, in a similar manner to the twisting step described immediately here below. Such a method, in which two clamps are applied, is used to manufacture the brush (28) in
In a secondary twisting step (107), as indicated by arrow (108), a second region (89) of the twisted stem pin (86) is twisted further. The first region (87) is unable to twist due to the fact that it has been clamped, as explained above with reference to the fixing step (105). In the secondary twisting step (107), the second region (89) can be twisted such that the number of additional twists in the second region (89) does not exceed 10, given that a total of 20 twists is sustainable before any damage is caused to the multiplicity of fibres. For example, if during the primary twisting step (103), the stem pin (80) is twisted 12 times, the first region (87) has 6 twists and the second region (89) has 6 twists. Thus, during the secondary twisting step (107) the second region (89) can only be twisted a further 4 times. Therefore, as can be seen in the example above, the number of additional twists that the stem pin (80) can sustain during the secondary twisting step (107) must be calculated bearing in mind the number of twists applied to that region of the stem pin (80) during the primary twisting step (103). Preferably, during the second twisting step, the stem pin (80) is twisted between 1 and 5 times. The second region (89) becomes a second zone of an assembled cosmetic applicator brush, in this instance the second zone being similar to the second zone (18) shown in
It is envisaged that where more than two zones are to be produced to produce, for example, the brush (24) in
The method as described above is either automated and occurs in line, such that each step occurs in the same device, or the primary twisting step (103) is done separately from the secondary twisting step (107) at different locations and using different machinery.
The multiplicity of fibres (82) can be trimmed after the primary twisting step (103), and then the secondary twisting (107) step can be performed separately. Alternatively, trimming can occur after the secondary twisting step (107) has been performed, such the multiplicity of fibres, which after secondary twisting are distributed as fibre arrays, are trimmed. In the automated process, trimming will take place after the secondary twisting step (107), and in this case the rotational device, on which the stem pin (80) is mounted, will continue to turn, without twisting the stem pin (80), and a cutter will approach the stem pin (80) and trim the fibre arrays so as to form the assembled brush.
The present invention thus provides a cosmetic applicator brush with defined zones, each zone having either a fixed or a variable pitch between adjacent fibre arrays located within the zones, to enable the amount and distribution of mascara loaded onto the brush to be varied.
Number | Date | Country | Kind |
---|---|---|---|
09306172.9 | Dec 2009 | EP | regional |