FR2692199A1 - Multicoloured colouring instrument - made from at least two waxy materials in different colours, giving random distribution in cross=section, with outer layer formed from total or partial mixt. of materials - Google Patents

Abstract

The colouring instrument is made from at least two waxy materials in different colours, mixed together so that a cross-section of the instrument has a random distribution of the basic colours and mixt. of these, with an outer layer formed from a total or partial mixt. of the colours. The wax materials used for the different colours can be made from the same waxes and binding agents, with the same viscosity and moisture content, produced in extruded sticks 2 - 5 cm long and 2 - 4 mm thick, mixed together and formed into compact blocks, which are then cold extruded e.g. in a hydraulic press, cut into lengths and dried. ADVANTAGE - Novel decorative effects.

Description

MULTICOLOR COLORING INSTRUMENT AND METHOD FOR MANUFACTURING THE SAME
The present invention relates to a multicolour coloring instrument, in particular a wax-based chalk having in its cross section a random distribution of different colors. It also relates to a manufacturing method specially designed for the production of such a multicolored coloring instrument.

 Coloring instruments having a plurality of colors have already been proposed.

 For example in WO 82 00444 the wax chalk has a laminated structure of layers of different colors. It is performed by casting successive amounts of colored wax onto a flat bottom surface of a reservoir and allowing each amount of colored wax to cure at least partially to form a layer before casting the next amount. This gives a multilayer plate which is then cut longitudinally and transversely to obtain multicolored chalks.

 For example, in the document EP 0 147 905, the wax-based coloring instrument, which may optionally be used as a stick of the lipstick type, comprises a succession of colors distributed substantially randomly in the form of overlapping layers and interconnecting the one in the others. This coloring instrument is obtained by distributing, one after the other, one being melted, the waxy materials corresponding to each color; the temperature of said materials and the cooling period between each distribution being determined such that there are between the areas consisting of different materials mixed color interfaces.

 In these two examples, representative of what exists in the field of multicolored coloring instruments, the external appearance of the instrument has by construction all the characteristics of the color mixture that composes it. In addition, when using such a coloring instrument, one gets on the support a juxtaposition of the different individual colors that make up the instrument.

 The aim set by the applicant is to propose a coloring instrument which differs significantly from the aforementioned instruments.

 According to the invention, the multicolored coloring instrument, which is obtained from at least two waxy materials of different colors, is characterized in that, in its cross section, it has a random distribution and in the form of dots. a plurality of colors, namely on the one hand the unit colors of each waxy material and, on the other hand, the colors resulting from the intimate mixing of these waxy materials with each other, and in that it comprises a peripheral layer constituted by the total or partial mixing of said waxy materials.

 Thus, the user can visualize in the cut area of the coloring instrument the mixture of colors that he will obtain on his support and on the other hand he can already know the dominant shade (s) by observing the outer surface of the coloring instrument. instrument.

 Preferably, the coloring instrument is obtained from two different colored waxy materials and the peripheral layer is of a substantially uniform color, consisting of the intimate mixing of the two waxy materials. In this case, in its cross section, it presents points of three colors: the two unit colors and the color resulting from the mixture of these two colors. As it is a multicolored chalk, it can be observed that thanks to the point distribution of the mixture of the three colors, it is possible to obtain on the support either a variegation of the three colors or possibly the color of the outer surface. More precisely we obtain this last color alone by writing with the tip of the chalk by applying the chalk on the support with a certain pressure. In fact in this case we realize on the support itself the intimate mixture of points of waxy material which were individualized in the structure itself of the chalk.

 It is another object of the invention to provide a method specially designed for the manufacture of the above-mentioned multicolored coloring instrument, from several waxy materials of different colors.

 According to the invention, all the waxy materials being constituted from the same waxes and the same binders and having the same viscosity and the same moisture content, the process consists in: a) drawing independently of each other each material colored waxy to obtain wire rods of 2 to 5 centimeters long and 2 to 4 millimeters thick, b) mix rods of different colors in a determined proportion and homogeneously, c) compress the mixture of rods in the form of a compact block, d) cold-spinning a solid elongated body from the compact block through an exit die of a hydraulic press, e) cutting and drying the elongated body, so as to obtain multicolored solid coloring instruments.

 Unexpectedly, the Applicant has observed that under the aforementioned conditions there is a mixture of colored waxy materials at the exit die of the hydraulic press, so that the coloring instrument obtained multicolor had a peripheral layer constituted more or less intimate mixture of these waxy materials according to the conditions of implementation of the spinning and thus the outer surface of the instrument had a color resulting from the total or partial addition of unit colors of waxy materials.

 In addition, the Applicant has observed that in the cross section of the coloring instrument there is found the homogeneous mixture of waxy materials, in a point form, with points corresponding to each colored material, and points corresponding to the intimate mixtures of these materials. the ones with the others.

 Preferably, for the manufacture of a multicolored chalk, the diameter of the exit die is between 8 and 12 millimeters.

 It is desirable that the peripheral layer not occupy too much of the section of the coloring instrument. It may be in particular of the order of 0.5 millimeters thick, for coloring instruments having in cross section a diameter of between 8 and 12 millimeters.

 Preferably, the moisture content of the waxy materials before drawing is between 10 and 12% and the drying is carried out so as to obtain a residual moisture content of less than one percent on the multicolored coloring instrument obtained.

 Preferably the mixture is made from two waxy materials having complementary colors, for example yellow and blue, the outer surface of the coloring instrument can be in the color resulting from the intimate mixing of these two colors to be green .

 The invention will be better understood on reading the description which will be made of an example of manufacturing a multicolored chalk with a green outer surface and having in cross section a dotted mixture of yellow, blue and green.

 Independently of each other two waxy materials of color, yellow for the first and blue for the second.

 Each of these waxy materials is obtained by hot-forming the mixture of a number of constituents among which at least one wax, a binder, fillers and a pigment.

 Both waxy materials must be made from the same waxes and binders. The charges must be compatible, even if the relative proportion between the pigments and the charges may vary from one substance to another. The viscosity and moisture content of each mixture should be the same.

 In Table 1 below, the various components and their proportions are indicated in two waxy materials, one yellow A and the other blue B, given by way of example.

 Each waxy material, in the pasty state, is introduced into a drawing machine, which is an apparatus making it possible to obtain rods, of small dimensions, that is to say of 2 to 5 centimeters in length, preferably 3 to 4 centimeters and 2 centimeters in length. at 4 millimeters in diameter, preferably 2 to 3 millimeters. In this case it is cylindrical rods, but they may have a different shape as long as their maximum thickness is between 2 and 4 millimeters.

Table I

<tb> A <SEP> (Yellow) <SEP>% <SEP> B <SEP> (Blue) <SEP>%
<tb> Kaolin <SEP> 34.335 <SEP> 31.2
<tb> Talc <SEP> 2 <SEP> 2 <SEP> | <SEP> 34,335 <SEP> | <SEP> 31.2 <SEP> I <SEP>
<tb> Stearate <SEP> 1 <SEP> 3 <SEP> I <SEP> 3 <SEP> I <SEP>
<tb> Titanium <SEP> (TiO2) <SEP> 2 <SEP> 7
<tb> I <SEP> Pigment <SEP> Yellow <SEP> 14 <SEP> | <SEP> 5.5 <SEP> 1 <SEP> - <SEP>
<tb> I <SEP> Pigment <SEP> Blue <SEP> 15/3 <SEP> 1 <SEP> - <SEP> | <SEP> 2 <SEP> 1 <SEP>
<tb> Cellulose <SEP> Ether <SEP> 5 <SEP> 5
<tb> Wax <SEP> microcrystalline <SEP> 15,23 <SEP> 20
<tb> Wetting <SEP> non-ionic <SEP> 0.2 <SEP> 0.2
<tb> Soda <SEP> Caustic <SEP> 0.2 <SEP> 0.2
<tb> I <SEP> Non-ionic <SEP> emulsifier <SEP> 0.2 <SEP> | <SEP> 0.2 <SEP> I <SEP>
<tb> @ 00 <SEP>% <SEP> @ 00 <SEP>%
<tb> 100 <SEP> 1 <SEP> I <SEP> 100 <SEP>% <SEP> I
<tb> + <SEP> Water <SEP> 15 <SEP>% <SEP> 15 <SEP>%
<Tb>
The rods obtained, at the output of the drawing machine, have a moisture content of between 10 and 15%, here of the order of 15%.

 A proportion of rushes from each of the two waxy materials is distributed in a mixer, for example 65% of yellow rushes for 35% of blue rushes.

 The mixer used consists of a barrel in which the rods are placed, this barrel being animated on the one hand by a rotational movement on itself and on the other hand by different oscillating movements. It is a wheel mixer used in the field of powders.

 The rotational speed and the duration are determined so as to obtain a homogeneous distribution of the rods, without crushing them.

 The homogeneous mixture of rods is then placed in a so-called cartoucheuse device which comprises a mold in the form of a cylinder in which is applied by pressure a movable lid. We obtain a compact block which consists of the juxtaposition of all the yellow and blue rushes.

 This compact block is introduced into the cylindrical body of a hydraulic press, which comprises an outlet die whose orifice has a circular section. The diameter of this exit die is between 8 and 12 millimeters while the diameter of the cylindrical body of the press is of the order of 12 to 13 centimeters. The connecting end between the cylindrical body itself and the output die, arranged axially with respect to said body, has a curved shape allowing a gradual flow and without discontinuity of the pasty material constituting the compact block.

 By applying, by means of the pressure piston of the hydraulic press, a pressure of the order of 7 to 10 × 10 7 Pa, the spinning of the material composing the compact block is obtained through the exit die. The solid cylindrical body resulting from this spinning is cut and then dried so as to lower the moisture content to a residual rate of less than 1%.

 The sections obtained constituting the coloring instruments according to the invention are almost uniformly colored green on their outer periphery. On the other hand, the transverse section shows that, during the spinning of the compact block, an intimate mixture of the two yellow and blue waxy materials has occurred at the periphery, which leads to the formation of a green layer. peripheral a few tenths of a millimeter thick. Inside this peripheral layer, the waxy materials appear as dots of three distinct shades: yellow, blue and green, distributed randomly.

 One can try to explain the formation of the peripheral layer due to the heating that occurs during the displacement of the material against the inner wall of the cylindrical body and more particularly in the connecting end between the cylindrical body and the exit die, where the pressure on the material is greatest because of the narrowing of the passage section. By modifying the spinning conditions, it is possible to obtain different coloristic effects on the peripheral layer.

 The cohesion of the coloring instrument is only possible by using, as stated above, identical or compatible components in the two waxy materials used.

 The present invention is not limited to the embodiment which has just been described in a non-exhaustive manner. In particular it is up to the person skilled in the art to determine the pigments that will be used in each of the waxy materials in order to obtain the desired aesthetic character. In particular, the coloristic effect obtained thanks to the presence in the same coloring instrument of two single colors and the color resulting from their mixing can give rise to original presentations by theme, for example the theme of the herb for the instrument with yellow and blue as the base color, the tree theme for an instrument with green and red, the sun theme for an instrument with yellow and orange, and the sky theme for an instrument with white and blue.

Claims (7)

A multicolored coloring instrument, obtained from at least two different colored waxy materials, characterized in that in its cross-section it has a random and dot-like distribution of a plurality of colors, namely on the one hand the unit colors of each waxy material and secondly the colors resulting from the intimate mixing of these waxy materials with each other, and in that it comprises a peripheral layer constituted by the total or partial mixture said waxy materials. 2. coloring instrument according to claim 1 characterized in that being obtained from two waxy materials of different colors, it comprises a peripheral layer of substantially uniform color, consisting of the intimate mixture of the two waxy materials and in that in its cross-section it presents a random distribution and in the form of points of three colors, namely the two unit colors of the two colored materials and the color resulting from the mixture of these two materials. 3. Process for the production of the multicolored coloring instrument according to claim 1, starting from several waxy materials of different colors, characterized in that the waxy materials are constituted from the same waxes and the same binders and having the same composition. With the same viscosity and the same moisture content, it consists of a) drawing independently of each other each colored waxy material in order to obtain wire rods 2 to 5 centimeters long and 2 to 4 millimeters long. of thickness, b) mixing rushes of different colors in a determined proportion and homogeneously, c) compressing the mixture of rushes in the form of a compact block, d) cold-spinning a solid elongate body from the compact block to through an exit die of a hydraulic press, e) cutting and drying the elongate body, so as to obtain multicolored solid coloring instruments. 4. Method according to claim 3 for the manufacture of a multicolored chalk, characterized in that the diameter of the exit die is between 8 and 12 millimeters. 5. Method according to one of claims 3 or 4 characterized in that the moisture content of the waxy materials before drawing is between 10 and 15% and the drying is carried out so as to obtain a residual moisture content of less than one. percent on the muticolor coloring instrument obtained. 6. Method according to one of claims 3 to 5 characterized in that the spinning is carried out at a pressure of the order of 7 to 10.107 Pa. 7. A method according to claim 6 characterized in that the mixture is made of 65% yellow rods and 35% rushes of blue color, whereby the peripheral layer has a substantially uniformly green color.