EP2803290A1 - Method of measuring the efficiency of a hair dryer brush - Google Patents

Abstract

The invention relates to a method for measuring the drying efficiency of a brush hair dryer (1) provided with a brush (10) comprising a mandrel (11) provided with openings (12) for the passage of the air blown and provided with tufts of bristles (13) for brushing the fibers to be dried simultaneously with drying, a method employing a first support (20) holding a sheet of fibers (21) to be dried at their upper ends (22); ), and a second support (30) holding the brush hair dryer (1), the method comprising at least: a drying step, during a reference drying period, of the fluid contained in the sheet of fibers (21) to be dried, wherein a front face (23) of the web is subjected to the air flow from the brush hair dryer (1) operating at a reference power, where at least a portion (24) of the fiber web is subjected to blow drying by contact with a part of said tufts of silk (13), a step of measuring the evaporator ation of the fluid contained in the fiber web (21).

Description

The present invention relates to the technical field of hair dryers and, more particularly, to what will be called here brush hair dryers, namely any hair dryer equipped with a brush to perform during the drying of hair treatment often called blow dry.

A hand-held hairdryer generally comprises an elongated tubular body which contains a motor-fan unit formed of a propeller integral with the drive shaft of an electric motor. The electric motor is held in the tubular body by rigid arms which ensure the centering of the helix relative to the inner wall of the tubular body. Most often the tubular body is equipped with a handle comprising a connection cord to the electrical network and control members of the operation of the electric motor. During the operation of the hair dryer, the motorcycle fan unit draws air through an inlet located at the rear of the tubular body to push back through an outlet located at the front of the latter. The hair dryer also comprises, downstream of the propeller, means for electric heating of the blown air. The handle may form either a gun shape with the output of the hair dryer is a linear apparatus, that is to say, whose longitudinal axis of the brush is parallel or coincident with the longitudinal axis of the handle.

More particularly, a hair dryer brush comprises, attached in a fixed or detachable manner at its outlet, a hair treatment part called brush, provided with a mandrel having outlets of the blown air and having tufts of bristles for perform, simultaneously with drying, a brushing treatment and / or combing hair.

This brush can be fixed or can be driven in motorized rotation about its longitudinal axis.

Such a hair dryer brush gives satisfaction with regard to its dual function of drying-blow drying hair. However, the known brush hair dryers have several disadvantages: not achieving a sufficient level of performance; do not allow drying-blow-drying of a medium-length hair head at the end of a reasonably short time; consume too much electrical energy compared to the result obtained.

In addition, since the number of brush dryers on the market has risen sharply recently, it is not possible to demonstrate, objectively, what would be the most effective hair dryer brush.

Simultaneously with the development of new hair dryer brush, the Applicant has verified that brush hair dryers do not lose in drying efficiency. For this, she referred inter alia to the method of measuring the effectiveness of a hair dryer recommended by MDE H03 A 019. For the record, this measure determines a drying rate according to a precise and repeatable protocol using an ISO 2267 canvas: the hair dryer is placed in front of a flat surface constituted by the wet tissue. A drying index of the fabric is measured by the hair dryer using the weighing of the initially wet fabric frame and the fabric frame after exposure to the operating hair dryer for a predetermined time.

It turned out for the plaintiff that while this standard is quite clear, precise and reproducible, it does not represent the actual conditions of daily use of a hair dryer brush by a professional or private user. Indeed, no standard is known to date for measuring the performance of a hair dryer equipped with a brush for drying at the same time as a brushing in contact with the brush. It is from this point of view quite perfectible. The development of a protocol for measuring the effectiveness of a hair dryer Brush then became an independent goal for our inventors and is the subject of this application.

One of the objectives was therefore to propose a measurement method within the framework of a private protocol and which could nonetheless be eligible as a standard.

To achieve the objectives described above, the invention relates to a method of measuring the drying efficiency of a brush-equipped hair dryer comprising a mandrel provided with blown air passage holes and provided with tufts of bristles for brushing the fibers to be dried simultaneously with drying, a method employing a first support holding a web of fibers to be dried at their upper ends, and a second support holding the hair dryer brush, the method comprising least: a drying step, during a reference drying period, of the fluid contained in the sheet of fibers to be dried, where a front face of the sheet is subjected to the air flow from the hair dryer brush operating at a power reference, where at least a portion of the fiber web is subjected to blow drying by contact with a portion of said tufts of silk; a step of measuring the evaporation of the fluid contained in the sheet of fibers. Thus this process makes it possible to ensure the reproducibility and the precision of the measurement of the effectiveness, whatever the hair dryer brush tested. This method of measuring effectiveness makes it possible to recover the convection and also the conduction of the brush on the hair, the current drying index of the standard recovering only the convection. Also, knowing that the air flows at the outlet of the holes of the brush mandrel are lower than the air flow of an output of a conventional brushless hair dryer covered by the standard, the process according to the The invention is much more representative of the drying efficiency of the brush under usual conditions.

According to one characteristic of the invention, during the drying step, the longitudinal axis of the mandrel and the longitudinal axis of the first support are parallel. This makes it possible to reproduce as closely as possible the conditions of drying on a head, the user always leaving the root and pulling the apparatus while keeping it substantially parallel to the tangent plane of the head containing the treated lock, at least for the beginning of the lock.

According to a feature of the invention, alternative or additional to the previous one, during the drying step, the longitudinal axis of the mandrel and the longitudinal axis of the first support are fixed relative to each other. This allows reproducibility and proven accuracy of the measurement process.

According to one characteristic of the invention, the measuring method involves a comb and comprises, during the drying step, a step of combing a free width of the web. The free width is a width not subject to blow drying: width arranged between the first support and the portion of the outer surface of the mandrel coming into contact with the fiber web. This combing on the free part of the web, that is to say on the part of the web between the first support and the first point of contact with the tufts of bristles, will be all the more appreciated if the longitudinal axes of the mandrels and web support are kept fixed during the drying step. Indeed, if they are fixed, it is more likely that the treated lock is intertwined without being detached or adjusted accordingly. This combing, punctual or permanent, avoids any entanglement of hair on the brush and allows the drying step to be completed without problems and as regularly as possible, so the most reproducible possible. This makes it all the more possible to avoid a locking in rotation when the mandrel is driven in motorized rotation, as will be seen later.

According to one characteristic of the invention, the combing step is carried out with the comb whose longitudinal axis is arranged parallel to the longitudinal axis of the first support. This makes it possible to comb the entire wick of the sheet at the same height without favoring one wick more than the other.

According to a feature of the invention, the combing step is movable relative to the fiber web, the comb being driven in oscillation. Particularly, the comb can be driven in oscillatory translation along its own longitudinal axis. Advantageously the movement of the comb relative to the web can be regular. In a particular configuration, the combing takes place during the entire drying step. This mobility on the sheet allows permanent installation of the comb and further avoids entangling the sheet of hair during the drying step on the silk tufts of the brush.

According to a feature of the invention, the mandrel of the hair dryer brush is spaced from the first support so that, during the drying step, the fibers remain in contact with the outer surface of the mandrel so as to define a contact angle α between 120 ° and 270 °, or between 180 ° and 250 °. This allows to reproduce at best the best conditions of use of the hair dryer brush. It is constantly sought that the dried and brushed wick surrounds the mandrel a minimum (about 120 °), to benefit from more wick surface treated by the mandrel simultaneously, and surrounds the mandrel a maximum (about 250 °) to avoid that it is unwantedly wrapped around the complete mandrel, this may be the source of hair entangled on the tufts or even blocked on the mandrel and burnt by the hot air flow.

According to a characteristic of the invention, the longitudinal axis of the mandrel of the hair dryer brush is spaced from the longitudinal axis of the first support so that during the drying step, the fiber web defines an angle of attack β between 0 ° and 90 ° relative to a horizontal plane, or even between 30 ° and 60 °. This makes it possible to better reproduce the actual conditions of use of the hair dryer brush, and this also makes it possible to easily visualize and observe the constancy of the contact angle α defined above.

According to one characteristic of the invention, the measuring method involves a hair dryer brush comprising a drive motor of the brush, and during the drying step, the brush is driven in axial rotation motorized by said motor. This makes it possible to reproduce the real conditions of use of the hair dryer brush when it includes a motor driving the brush.

According to one characteristic of the invention, which is an alternative to the previous one, the measuring method involves a brush-less hair dryer without an integrated drive motor and the second support comprises means for driving the mandrel in rotation about its longitudinal axis, and, during the drying step, the brush is driven in axial rotation motorized by said drive means. This makes it possible to put on the same point of measurement the motorized rotating brush hair dryers and those that are not, by rotating the brush of the two types of brush hair driers placed on the market and thus producing the same conditions fiber treatment.

According to one characteristic of the invention, the width of the sheet of fibers to be dried is equal to a percentage of the height of the mandrel between 70% and 100%. This makes it possible to better reproduce the actual conditions of use of the hair dryer brush.

According to the invention, the sheet to be dried can be of different types. Thus, the web to be dried may comprise hair, comprise a fabric, a nonwoven textile web or a set of juxtaposed threads or bundles of free yarns. The textile web may be attached at its only upper edge or on the contrary be fixed on at least two of its sides. The constituent material of the threads of the web may be natural or synthetic.

According to a particular characteristic of the invention, the sheet of fibers to be dried comprises human hair. The use of human hair makes it possible to obtain, in the laboratory, an evaluation of the performance of the hair dryer under conditions very close to reality.

According to one characteristic of the invention, the sheet of fibers to be dried more particularly comprises a series of locks of hair juxtaposed and fixed only at their upper end by the first support. It appears that such an embodiment makes it possible to simulate even more realistically the behavior of a human hair.

According to one characteristic of this variant, the mass of each lock of hair may be less than 10 g. According to a particular characteristic of this variant, the mass of each lock of hair may be between 2 g and 6 g, or more precisely between 3g and 5g. This wick size makes it possible to approach the size and thickness of the strands formed during the passage of the brush in a long or medium-length hair.

According to one characteristic of the invention, the height of the sheet of fibers to be dried is greater than or equal to 200 mm or even 250 mm. This length of hair makes it possible to simulate half-long or even long hair.

According to one characteristic of the invention, the step of measuring the evaporation involves the ratio of the mass of the sheet of fibers to be dried thanks to a first step of measuring the mass of fiber web prior to drying. and a second step of measuring the mass of fiber web subsequent to drying.

Prior to the evaporation measurement or the measurement of the mass of web before drying, the wetting of the ribbon is carried out in a precise step to be as reproducible as possible. A mass of fluid is applied to the ply and this fluid mass is distributed over the ply. So that the distribution is as homogeneous as possible, the wicks are dipped in a fluid reservoir and the mass is adjusted by passing the web on a towel, so as to eliminate the excess water.

Prior to drying the fiber web, the hair dryer brush works without drying fibers. It can work for several minutes, for example 10 minutes. This makes it possible to stabilize its temperature.

This protocol was set up to measure the effectiveness of any brush hair dryer described above, motor brush or not. Nevertheless, as it is about comparative tests expected by consumers, the applicant has taken care to develop the measurement process by verifying that it fits any hair dryer brush market.

Such proportions also make it possible to be as close as possible to the drying conditions of an adult's hair.

Of course, the various features, forms and variants of embodiment and implementation of the invention can be associated with each other in various combinations to the extent that they are not incompatible or exclusive of each other.

• Les figures 1 et 2 sont une vue de côté d'un sèche-cheveux brosse, et respectivement une vue en coupe d'un tel appareil selon le plan A-A.
• La figure 3 est une perspective schématique montrant le premier support maintenant une nappe de fibres à sécher; la figure 4 montre comment la nappe de la figure 3 sera en contact avec la brosse de l'appareil ;
• Les figures 5 et 6 sont une vue en perspective et une vue de côté montrant la nappe de fibres pendant l'étape de séchage
• La figure 7 est une perspective schématique complète montrant le dispositif complet pour la mise en oeuvre du procédé selon l'invention.

Moreover, various other features of the invention will emerge from the following detailed description with reference to the appended drawings which illustrate, in a nonlimiting manner, one embodiment of a method for evaluating the drying performance of any hair dryer brush.

• The Figures 1 and 2 are a side view of a hair dryer brush, and respectively a sectional view of such a device according to the plane AA.
• The figure 3 is a schematic perspective showing the first support holding a web of fibers to be dried; the figure 4 shows how the tablecloth of the figure 3 will be in contact with the brush of the device;
• The Figures 5 and 6 are a perspective view and a side view showing the fiber web during the drying step
• The figure 7 is a complete schematic perspective showing the complete device for carrying out the method according to the invention.

A hair dryer brush as illustrated in Figures 1 and 2 and generally designated by the reference 1, comprises a housing 2 in the form of tubular body substantially symmetrical in revolution along a longitudinal axis Δ, except for the handle 3 which is located at the rear. The tubular body 2 can be formed in several pieces and, for example, in the form of two half-shells made of plastics material assembled along an axial plane and supplemented by inserts, especially with regard to the handle 3. A brush 10 is arranged at the end of the housing 2. The brush 10 comprises a mandrel 11 having air passages 12 and having tufts of silk or bristles 13.

As shown by Figures 1 and 2 , the apparatus whose drying efficiency will be measured therefore comprises a housing 2 of tubular form forming a handle 3 which encloses air circulation means between an air inlet opening 4 located at the end rather remote from the brush 10 and an air outlet opening 5 located near the brush. The handle 3 and the brush 10 are here aligned in the same longitudinal axis, but may alternatively be arranged along two parallel axes not coincidental or may have an inclination to form a gun. Advantageously, the housing 2 encloses, between its air inlet openings 4 and the air outlet openings 5, a fan 6, driven in rotation by a first electric motor 7 in the extension of which is arranged an element 8. In the illustration taken by way of example, the fan 6, its drive motor 7 and the heating element 8 are arranged inside the handle 3. The hot air blown by the handle arrives inside a hollow body of the brush 10. The heating element 8 is located in the blowing chamber and can be made in any suitable manner and, for example, in the form of a heating electrical resistance held by radial fins made of insulating materials such as for example mica sheets.

The active part of the brush is defined by the outer surface of the mandrel 11, here cylindrical surface provided with tufts of bristles or bristles or pins 13 and orifices 12 air passage here uniformly distributed on the surface. The tufts of bristles may be natural or synthetic bristles, the pins may be plastic, arranged in tufts distributed in regular longitudinal rows on the mandrel 11. It is illustrated in FIG. figure 2 a second motor 9 arranged, by way of example, in the body of the brush accessory and for driving the brush in motorized rotation in one or the other direction of rotation. The motor is a geared motor unit that ensures that the brush is driven at the speed and torque required for operation.

In order to benefit from an objective basis of comparison which accounts for the drying performance of a hair-dryer, the invention proposes a method for measuring the efficiency of drying, making it possible to reproduce as faithfully as possible the current mode of use.

According to the invention, the method of measuring the drying efficiency applies to a hair dryer brush 1 as illustrated in FIG. Figures 1 and 2 . The method employs a first longitudinal support holding a web of fibers 21 to be dried at their upper ends 22, and a second support 30 holding the brush dryer 1 as illustrated in FIG. Figures 5, 6 and 7 . The method comprises at least one drying step, during a reference drying time (for example 1 minute), of the fluid (water for example) contained in the sheet of fibers 21 to be dried, where a face 23 called the front face of the web is subjected to the air flow from the brush hair dryer 1 operating at a reference power, where at least a portion 24 of the fiber web is subjected to blow drying by contact with a portion of said tufts of silk 13, and a step of measuring the evaporation of the fluid contained in the sheet of fibers 21. The fluid contained in the sheet is essentially water. The power of reference can be the maximum power of the apparatus when this one makes it possible to choose between different levels of power. It will be between 300W (700W for example) and 1200W.

The invention proposes to implement a drying frame which is illustrated alone in figure 3 and whose function will be to simulate the behavior of a hair. The frame to be dried comprises the first support 20 which defines a kind of longitudinal shape comprising mainly attached the fiber web 21 to be dried of width I21 and height H21. The upper end 22 of the web holds the fibers. A base makes it possible to place the frame to be dried on a flat surface so that the first support 20 has a substantially horizontal orientation. According to the example illustrated in Figures 5 and 6 , the "frame to be dried defines a curtain or rectangular sheet hanging from the support 20 with a height H21 greater than or equal to 200 mm (for example between 250 and 300 mm) and a width I21 greater than or equal to 270 mm. The support keeps the sheet of fibers to dry, which simulates the mass of the hair of a hair. The web is attached at its upper edge to a horizontal upper bar of the support. The support 20 could be fixed at one or both of its ends so as to give it a certain freedom of floating or movement under the effect of a flow of air and traction as is the case for a hair. The number of strands attached to the support varies between three and twenty ( figure 3 ), for example five ( figure 4 ).

As illustrated in figures 4 , 5 and 6 in the embodiment described, the longitudinal axis of the mandrel and the longitudinal axis of the first support are parallel, and fixed relative to each other.

The Figures 5, 6 and 7 illustrate the comb 40 arranged between the first support 20 and the mandrel 11 to comb the web in its width. The ends of the teeth of the comb are arranged to point downwards, the plane of the teeth being substantially vertical, but these ends of the teeth could be alternately arranged to point for example upwards so as to ensure the holding of the combed lock during the process. The longitudinal axis L40 of the comb 40 is arranged parallel to the longitudinal axis L20 of the first support 20, the teeth passing through the web may be for example included in a plane orthogonal to that substantially defined by the worsted web. The comb 40 may be movable relative to the ply 21, the comb 40 being driven in oscillation, for example in oscillatory translation along its own longitudinal axis L40 according to the arrows shown in FIG. figure 5 . The oscillation has for example a frequency allowing 8 to 10 complete oscillations over 10 seconds, the distance traveled during a displacement being between 1 and 5cm, for example equal to about 2cm. The oscillation can be regular, the translation interval can be regular. The movement of the comb can be done during the entire step of drying the web, or can be done temporarily and / or regularly.

The Figures 5, 6 and 7 illustrate the mandrel 11 of the brush dryer 1 spaced from the first support 20 so that, during the drying step, the fibers F remain in contact with the outer surface S11 of the mandrel so as to define a contact angle α of between 120 ° and 270 °, or between 180 ° and 250 °. Also, the longitudinal axis L11 of the mandrel 11 of the hair dryer brush 1 is spaced from the longitudinal axis L20 of the first support 20 so that during the drying step, the fiber web 21 defines an angle of attack β between 0 ° and 90 ° relative to a horizontal plane, or even between 30 ° and 60 °. Preferentially β will be equal to 45 °.

The brush dryer 1 comprises a drive motor 9 of the brush 10, so that the brush 10 is driven in motorized axial rotation in the direction of rotation (r) indicated by the arrow in figure 6 . Alternatively the hair dryer brush 1 will be without integrated drive motor and the second support 30 comprises drive means 31 of the mandrel 11 in rotation about its longitudinal axis L11, so that during the drying step, the brush 10 is driven in axial rotation motorized by said drive means 31. The drive means 31 may be manual, for example a crank braked in rotation, or motorized by a geared motor assembly for example. To facilitate the process according to the invention, the rotation will be made in the same direction throughout the drying step of the same face of the fiber web.

As illustrated in Figures 3 and 4 , the width I21 of the fiber web 21 to be dried is equal to a percentage of the height H11 of the mandrel 11 between 70% and 100%, approximately equal to 90% in the illustration.

As illustrated in figure 3 and 4 the fiber web 21 to be dried comprises human hair. It comprises a series of locks of hair 25 juxtaposed and fixed only at their upper end 22 by the first support 20. It comprises natural hair in wicks 25 of a length of between 250 mm and 300 mm each. After their fixing, the length of the sheet will be of the order of 200mm to 250mm. Each wick 25 has a mass, measured in an atmosphere having a moisture content of the order of 50% ± 5%, less than 10 g and preferably between 2 g and 6 g, more precisely between 3 g and 5 g per example 4g. The attachment points of each wick 25 on the support 20 are equidistant and separated by a distance of the order of ten millimeters so that the sheet 21 defines a substantially continuous wall of hair of 200 mm by 200 mm. . There may be between 3 and 20 wicks, particularly between 3 and 5 wicks.

The frame to be dried thus constituted is used in at least one step of measuring the evaporation of the fluid or water, contained in the sheet 21, under the effect of the air flow of a hair dryer. brush to evaluate.

These measurement steps will preferably be carried out under substantially similar test conditions, namely an ambient temperature of between 18 ° C. and 35 ° C., for example between 20 ° C. and 23 ° C., with an ambient humidity level of the order of 50% ± 5%.

Firstly, the sheet 21 of hair is moistened homogeneously with a predetermined amount of water, called the amount of test water Qe, for example, of the order of 15 g ± 5 g. Then, the frame to be dried is placed on a weighing device such as a scale (not shown) having an accuracy of the order of one tenth of a gram.

During the first drying-treatment step, the front face 23 of the ply 21 is subjected directly to the air flow of the hair dryer and the blow-drying of the clumps. bristles 13, the apparatus being set to a reference power corresponding, for example, to its nominal power or its maximum power.

The step of measuring evaporation involves the ratio of the mass of the sheet of fibers 21 to be dried by a first step of measuring the mass of fiber web 21 prior to that of drying and a second measuring step the mass of fiber web 21 subsequent to that of the drying.

Prior to the evaporation measurement or the measurement of the mass of web before drying, the wetting of the ribbon is carried out in a precise step to be as reproducible as possible. A mass of fluid is applied to the ply and this fluid mass is distributed over the ply. So that the distribution is as homogeneous as possible, the locks are dipped in a fluid reservoir and the mass is adjusted by passing the web on a towel, so as to eliminate excess fluid. Before starting the hair-dryer, a first measurement M1 is made of the mass or the weight of fluid, for example water, present in the sheet 21. Before the drying of the fiber mat, the Hair dryer brush works without drying fibers. It can work for several minutes, for example 5 to 15 minutes. This makes it possible to stabilize the temperature of mandrel 11.

Then, the hair dryer brush, placed in the configuration described above and illustrated in the figure 7 , is turned on during a test duration having a value of the order of several tens of seconds to a few minutes, for example chosen to be worth 1 minute. At the end of the test period D1, a second measurement M2 of the mass or weight of water present in the sheet 21 is made.

l'indice de séchage étant exprimé en grammes par minute (g.min^-1). Cette mesure peut être répétée 5 fois.The two measurements M1 and M2 are then used to determine a first drying index Is ₁ according to the formula = $\frac{M1-M2}{\mathit{Of}},$

the drying index being expressed in grams per minute (g.min ^-1 ). This measurement can be repeated 5 times.

According to the implementation examples described above, the surface of the sheet 21 is identical for all the hair dryers tested. The surface of the web 21 is then chosen to represent a wick formed by the user in normal use.

According to the tests carried out in the laboratory, it turns out that the procedure described above is able to provide relevant results to compare the drying performance of two rotating brushes of similar construction on the same batch of locks, for example, an 800W brush and a 1000W brush.

• une première étape de mesure d'un premier sèche-cheveux brosse fonctionnant à une puissance de référence (P1) selon des critères prédéfinis par l'invention ;
• une deuxième étape de mesure d'un deuxième sèche-cheveux brosse fonctionnant à une puissance de référence différente (P2) sur la même mèche de cheveux utilisée pour la première étape, le procédé de mesure étant identique à celui de la première étape ;
• une troisième étape consistant en une comparaison des valeurs mesurées par la première étape et la deuxième étape.

It is therefore a method of comparing efficiencies between two hair-dryer brushes comprising:

• a first step of measuring a first brush hair dryer operating at a reference power (P1) according to criteria predefined by the invention;
• a second step of measuring a second hair dryer brush operating at a different reference power (P2) on the same lock of hair used for the first step, the measurement method being identical to that of the first step;
• a third step consisting of a comparison of the values measured by the first step and the second step.

• La température ambiante est comprise entre 15°C et 25°C avec un taux d'humidté ambiante de l'ordre de 50% ± 5% ;
• Position des interrupteurs : maxi ;
• Tension nominale : tension nominale ou milieu de la plage ;
• Caractéristique d'une mèche : type caucasien sans ondulation avec une longueur entre 25 et 30 cm et une masse de 4g±0,2g ;
• Préparation de 3 mèches de cheveux qui sont lavées avec du shampoing, rincées et préséchées à l'aide d'une serviette et étuvées 1h à 50°C.

In tests carried out for our products, test conditions are predefined in which:

• The ambient temperature is between 15 ° C and 25 ° C with an ambient humidity rate of the order of 50% ± 5%;
• Switch position: max;
• Rated voltage: rated voltage or middle of the range;
• Characteristic of a wick: Caucasian type without undulation with a length between 25 and 30 cm and a mass of 4g ± 0.2g;
• Preparation of 3 locks of hair that are washed with shampoo, rinsed and pre-dried with a towel and baked for 1 hour at 50 ° C.

Before the test runs, the brush should run for 10 minutes to stabilize its temperature. Place the support frame + the locks on the scale and tare the scale.

1. 1. Humidifier uniformément les mèches de cheveux sur une longueur de 11cm en partant de la pointe, avec 1,8g ± 0,1g d'eau en s'assurant que l'eau ne remonte pas au dessus des 11cm prévus. Utiliser un réservoir rempli d'eau pour plonger les mèches pendant un temps qui doit être inférieur à 20s. Enlever le surplus d'eau à l'aide d'un peigne fin et d'une serviette éponge. Ne peigner que la partie humide des cheveux. Uniquement la face qui va être en contact avec la brosse pendant l'essai doit être en contact avec la serviette. Si le poids d'eau minimale n'est pas atteint, effectuer à nouveau un trempage de la mèche ;
2. 2. Placer le cadre support et la mèche sur la balance. Noter la masse d'eau (m1) déposée, (m1) devant être comprise entre 1,7g et 1,9g ;
3. 3. Alors que la brosse est en fonctionnement, positionner le cadre support + mèches sur le montage pendant 20 secondes pour sécher les mèches. Utiliser un peigne pour balayer lentement (environ 1 aller/retour par seconde) les mèches afin d'éviter le blocage en rotation du moteur de brosse ;
4. 4. Après les 20 secondes de séchage, placer le cadre support+mèches sur la balance et noter la masse d'eau restant sur les mèches (m2) ;
5. 5. Les étapes 1 à 4 sont répétés 5 fois ;

The course of the test for the first brush consists of the following steps:

1. 1. Moisten the strands of hair uniformly over a length of 11cm starting from the tip, with 1.8g ± 0.1g of water making sure that the water does not rise above the 11cm provided. Use a tank filled with water to plunge the wicks for a time that must be less than 20s. Remove the excess water with a fine comb and a towel. Comb only the wet part of the hair. Only the face that will be in contact with the brush during the test should be in contact with the towel. If the minimum water weight is not reached, re-soak the wick;
2. 2. Place the support frame and the wick on the scale. Note the mass of water (m1) deposited, (m1) to be between 1.7g and 1.9g;
3. 3. While the brush is running, position the frame + wicks on the mount for 20 seconds to dry the wicks. Use a comb to sweep slowly (approximately 1 round trip / second) the drill bits to prevent the rotation blocking of the brush motor;
4. 4. After 20 seconds of drying, place the support frame + wicks on the scale and note the mass of water remaining on the wicks (m2);
5. 5. Steps 1 to 4 are repeated 5 times;

For the second brush, keep the same strands and repeat steps 1 to 5. Each batch of 3 wicks can only be used for 10 measurements. At the end of these measurements, these must be changed.

The drying indices for each of the brushes are then calculated according to the formula described above, which makes it possible to conclude the comparison of efficiency of the two brushes with different powers. As an indication, we have carried out tests using this method, on the products known under the name "Brush Activ '(trademark) Nano Smart (registered trademark)" and "Brush Activ' (registered trademark) Volume & Shine" marketed by the plaintiff. Here are the results: 80.3% for the "Brush activ" (registered trademark) Nano Smart (registered trademark) "and 77.7% for the" Brush activ '(registered trademark) Volume & Shine ".

Of course, various other modifications may be made to the measuring method according to the invention within the scope of the appended claims. Those skilled in the art may juxtapose various steps set forth herein to modulate the measurement method.

Claims (19)

Method for measuring the drying efficiency of a brush-type hair dryer (1) provided with a brush (10) comprising a mandrel (11) provided with orifices (12) for the passage of blown air and provided with tufts of bristles (13) for brushing the fibers to be dried simultaneously with drying, a method employing a first support (20) holding a sheet of fibers (21) to be dried at their upper ends (22), and a second support (30) holding the hair dryer brush (1), the method comprising at least: - A drying step, during a reference drying period, of the fluid contained in the sheet of fibers (21) to be dried, where a front face (23) of the sheet is subjected to the air flow from the hair dryer brush (1) operating at a reference power, wherein at least a portion (24) of the fiber web is blow-dried by contact with a portion of said tufts of silk (13), a step of measuring the evaporation of the fluid contained in the sheet of fibers (21). Measuring method according to the preceding claim, characterized in that , during the drying step, the longitudinal axis (L11) of the mandrel (11) and the longitudinal axis (L20) of the first support (20) are parallel. Measuring method according to one of the preceding claims, characterized in that , during the drying step, the longitudinal axis (L11) of the mandrel (11) and the longitudinal axis (L20) of the first support (20) are fixed. one with respect to the other. Measuring method according to one of the preceding claims, involving a comb (40), comprising, during the drying step, a combing step of a free width (I21) of the web (21). Measuring method according to the preceding claim wherein the combing step is performed with the comb (40) whose longitudinal axis (L40) is arranged parallel to the longitudinal axis (L20) of the first support (20). Measuring method according to one of the two preceding claims, wherein the combing step is movable relative to the fiber web (21), the comb (40) being driven in oscillation. Measuring method according to the preceding claim, wherein the combing step is movable relative to the fiber web (21), the comb being driven in oscillatory translation along its own longitudinal axis (L40). Measuring method according to one of the preceding claims, wherein the mandrel (11) of the brush dryer (1) is spaced from the first support (20) so that during the drying step the fibers (F) remain in contact. with the outer surface (S11) of the mandrel so as to define a contact angle α of between 120 ° and 270 °, or even between 180 ° and 250 °. Measuring method according to one of the preceding claims, wherein the longitudinal axis (L11) of the mandrel (11) of the brush dryer (1) is spaced from the longitudinal axis (L20) of the first support (20) so that during the drying step, the fiber web (21) defines an angle of attack β between 0 ° and 90 ° with respect to a horizontal plane, or even between 30 ° and 60 °. Measuring method according to one of the preceding claims, comprising a brush dryer (1) comprising a drive motor (9) of the brush (10), characterized in that , during the drying step, the brush (10) ) is driven in axial rotation motorized by said motor (9). Measuring method according to one of the preceding claims 1 to 9, involving a brush dryer (1) without an integrated drive motor and where the second support (30) comprises means (31) for driving the mandrel (11) in rotation about its longitudinal axis (L11), characterized in that , during the drying step, the brush (10) is driven by axial rotation motorized by said drive means (31). Measuring method according to one of the preceding claims, wherein the width (I21) of the sheet of fibers (21) to be dried is equal to a percentage of the height (H11) of the mandrel (11) between 70% and 100%. Measuring method according to one of the preceding claims, characterized in that the fiber web (21) to be dried comprises human hair. Measuring method according to the preceding claim, characterized in that the sheet of fibers (21) to be dried comprises a series of locks of hair (25) juxtaposed and fixed only at their upper end (22) by the first support (20). ). Measuring method according to the preceding claim, characterized in that the mass of each lock of hair (25) is less than 10 g, or even between 2 g and 6 g. Measuring method according to one of the preceding claims, characterized in that the height (H21) of the fiber web (21) to be dried is greater than or equal to 200 mm. Measuring method according to one of the preceding claims, characterized in that the step of measuring the evaporation involves the ratio of the mass of the sheet of fibers (21) to be dried by means of a first step of measuring the fiber web mass (21) prior to that of drying and a second step of measuring fiber web mass (21) subsequent to that of drying. Measuring method according to one of the preceding claims, characterized in that it comprises, prior to the drying step, a step of wetting the sheet according to which a mass of fluid is applied to the layer of fibers (21) and distributing this mass of fluid on said web. A method of comparing efficiencies between two hair-dryer brushes comprising: - a first step of measuring a first brush hair dryer operating at a reference power (P1) according to any one of claims 1 to 18; - A second step of measuring a second hair dryer brush operating at a different reference power (P2) on the same lock of hair used for the first step, the measurement method being identical to that of the first step; a third step consisting of a comparison of the values measured by the first step and the second step.

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