Hair treatment device, including for curling and / or straightening, using steam

Abstract

Hair treatment device, in particular for curling and / or straightening, by steam. The invention relates to a hair treatment device (1) comprising: At least one steam outlet (78) configured to come into contact with the hair, A vaporization system (7) in fluidic communication with the steam outlet comprising a vaporization chamber (71) delimited by two opposing walls (81, 83), A liquid reservoir, and A liquid supply system (74) comprising a fluidic outlet opening into the vaporization chamber and configured to supply the vaporization chamber with liquid from the reservoir, the vaporization system (7) further comprising two opposing hydrophobic elements (100, 110) in the vaporization chamber (71) covering at least partially each of the opposing walls (81, 83), the fluid outlet (75) being disposed between the two opposing hydrophobic elements (100, 110).Figure for the summary: Fig. 3.

Description

Title of the invention: Steam-powered hair treatment device, particularly for curling and / or straightening technical field

[0001] The present invention relates to a hair treatment device, in particular for hair styling, especially for straightening and / or curling, comprising a steam application. Prior art

[0002] Many types of hair styling devices or accessories are known for shaping hair, particularly by straightening, curling or crimping. Straightening irons and curling irons are examples.

[0003] To improve hair treatment, some devices provide for the distribution of steam to a strand of hair or to the entire head of hair. Applications WO2014064660, EP2959793, EP2765884, and EP2449911 describe, for example, steam hair treatment devices comprising a liquid reservoir, in which a jaw includes a vaporization system and a steam distribution system for a strand of hair. A liquid, typically water or a hair cosmetic product, is stored in the reservoir and injected into the vaporization system, which includes a chamber, via a pipe. Under the action of heating means, upon contact with the vaporization chamber, the liquid changes into a vapor state and can reach the distribution system, which includes a plurality of slot-shaped orifices oriented so as to project the steam onto a strand of hair pinched between the two treatment surfaces.However, a rapid increase in the temperature of the liquid, which may contain minerals, in the vaporization chamber can lead to a gradual buildup of scale or limescale inside or at one end of the pipe, eventually causing a blockage. This phenomenon results in a malfunction of the hair styling device and reduces its lifespan.

[0004] International application WO2020 / 127852 describes an apparatus comprising a vaporization chamber and a distribution chamber, the vaporization chamber being supplied with fluid by a pipe having an opening along the pipe and / or a hydrophobic layer below the point of injection of the liquid into the vaporization chamber. Such features notably increase the service life of these apparatuses by limiting pipe obstruction.

[0005] However, the lifespan of the vaporization system remains limited, particularly due to the use of the device in different orientations, which still allows the formation of limescale at the opening.

[0006] There is therefore a need to further increase the lifespan of the device by limiting scaling of the vaporization system at the liquid supply level, particularly when the device is used with several orientations, while having a simple structure. Description of the invention

[0007] The invention addresses this need by means of a hair treatment device, in particular for hair styling, especially for straightening and / or curling, comprising: - At least one steam outlet configured to come into contact with or be near the hair, - A vaporization system in fluidic communication with the vapor outlet, comprising a vaporization chamber delimited by at least two opposing walls, - A liquid reservoir, and - A liquid supply system comprising a fluid outlet opening into the vaporization chamber and configured to supply the vaporization chamber with liquid from the reservoir, the vaporization system further comprising two opposing hydrophobic elements in the vaporization chamber covering at least partially each of the opposing walls, the fluid outlet being disposed between two opposing hydrophobic elements.

[0008] By “fluidic communication”, it is understood that the passage of fluid between the two is made possible directly or indirectly.

[0009] The term "hydrophobic element" means an element having at least one surface of a hydrophobic material or layer. Hydrophobic elements may be made of a hydrophobic material, in particular a sheet or coating of a hydrophobic material. Alternatively, hydrophobic elements comprise a sheet of a material that is not necessarily hydrophobic, coated at least on the surface extending into the vaporization chamber with a hydrophobic layer. The hydrophobic material may include polytetrafluoroethylene (PTFE).

[0010] The fact that the vaporization chamber has two opposing hydrophobic elements within it limits the vaporization of the liquid in the vaporization chamber from occurring at the fluid outlet, by repelling the liquid exiting the fluid outlet from the hydrophobic element with with which it comes into contact. It is thus possible to relocate the formation of scale to areas far from the liquid inlet, which makes it possible to delay the obstruction by scale of the fluid outlet and therefore to prolong the life of the vaporization system.

[0011] Moreover, the presence of the two opposing hydrophobic elements allows for the aforementioned advantage when the device is used in one direction or the other.

[0012] Preferably, the device is a hair styling device, in particular for curling or straightening.

[0013] Preferably, the treatment device is elongated along a principal axis. Alternatively, the treatment device is of a different, non-elongated shape.

[0014] Preferably, the treatment device comprises a handpiece with a handle and a head. The handle facilitates gripping the device and allows for the insertion of additional elements into the device, including a user interface, a reservoir for the fluid to be vaporized, and optionally a reservoir for the cosmetic product. Preferably, the head comprises the vaporization chamber and the heating element.

[0015] The head of the processing device can be of any shape in cross-section. Preferably, the head of the processing device has a substantially polygonal shape in cross-section, in particular a substantially rectangular or square, or a substantially oval or circular shape. Other cross-sectional shapes are possible, such as a section with a polygonal contour on one side and a non-polygonal, in particular rounded, for example circular, contour on the other. Preferably, the head of the device is generally flattened in cross-section.

[0016] Preferably, the device, in particular the head of the device, comprises a hair treatment sole configured to come into contact with or be positioned opposite the hair and having the steam outlet. Preferably, this treatment sole comprises a base having a substantially flat or substantially outwardly convex outer surface. Preferably, this treatment sole has, in front view, a substantially polygonal outline, in particular rectangular or square, but may also be circular or oval.

[0017] The liquid reservoir can be integrated into the handpiece, in particular into its handle as previously described. Alternatively, the device comprises a base in fluidic communication with the handpiece, in particular at its handle, in which the reservoir of liquid to be vaporized is integrated. Alternatively still, the device is connected, in particular via its handle, to an external liquid supply, in particular to an external water outlet.

[0018] Preferably, the device is a hair straightening and / or curling device.

[0019] The device may comprise two jaws arranged opposite each other and articulated between a closed treatment configuration and an open hair engagement configuration between the jaws. At least one of the jaws comprises an internal treatment element, in particular defining the treatment plate, having an internal treatment surface configured to come into contact with or face a portion of the hair strand in the closed configuration. The internal treatment surface may be a heat treatment surface, the internal treatment element being in particular a heating plate, extending opposite the other jaw.

[0020] At least one of the jaws may include the vaporization chamber.

[0021] Preferably, the other jaw is devoid of a vapor outlet and vaporization chamber.

[0022] Each jaw can be carried by an arm, the two arms being connected to each other, notably by a joint at one of their ends, to assume the closed or open jaw configuration. Each of the two arms can include a half-handle on the joint side and one of the jaws on the free end side.

[0023] Preferably, the liquid to be vaporized is water, preferably non-demineralized and non-distilled water. Vaporization system

[0024] The vaporization system may include at least one body that at least partially delimits the vaporization chamber and includes at least one of the two opposing walls. The vaporization system may further include a lid configured to close an opening in the body, the body including one of the two opposing walls and the lid including the other of the two opposing walls, the body and the lid at least partially delimiting the vaporization chamber. Alternatively, the vaporization system includes a body that defines both opposing walls.

[0025] The vaporization system may include a distribution chamber in fluidic communication with the vaporization chamber and the vapor outlet(s). Vaporization chamber

[0026] Preferably, the vaporization chamber extends along a main axis, in particular a longitudinal axis, parallel to the main axis of the device.

[0027] Preferably, the vaporization chamber is unique in the device.

[0028] Preferably, the vaporization chamber comprises a first volume of vaporization and a second vaporization volume in fluidic communication with the first vaporization volume, the feeding system extending into The first volume. The first and second vaporization volumes can be joined by a passage with a reduced cross-section compared to at least one cross-section of the first vaporization volume. The presence of two vaporization volumes separated by a reduction in cross-section limits the flow of liquid water from the first volume to the second vaporization volume and retains scale particles that could form in the first vaporization volume. The first and second vaporization volumes can be of identical width and longitudinally continuous along the main axis of the vaporization chamber. The reduced cross-section passage can be formed by a protruding feature on one of the walls, particularly the upper or lower wall.

[0029] The volume of the vaporization chamber can be between 3000 mm³ and 20000 mm³. The vaporization chamber volume can be greater than or equal to 5%, preferably greater than or equal to 8%, or even better, greater than or equal to 10% of the total volume of the vaporization chamber. Such a vaporization chamber allows for sufficient vapor to be contained to ensure effective hair treatment while maintaining a sufficiently compact and lightweight device.

[0030] Preferably, the two opposite walls are the walls of the vaporization chamber with the largest surface area. One of the two opposite walls may overlap at least partially with the heating structure.

[0031] Preferably, the two opposing walls are located on either side of the smallest transverse dimension of the vaporization chamber at the fluid outlet, in particular the height. This limits scale formation on the smallest dimension, which is the one most likely to cause obstruction of the fluid outlet.

[0032] The two opposite walls can have substantially identical internal surfaces to the vaporization chamber. Hydrophobic elements

[0033] At least one of the two opposing hydrophobic elements, preferably both opposing hydrophobic elements, may each consist of a coating extending over the corresponding wall, in particular a coating on a part of the body of the vaporization system and a coating on the lid of the vaporization system. At least one of the two opposing hydrophobic elements may be formed by applying a hydrophobic material to the corresponding opposing wall in the manner of a paint or coating.

[0034] Alternatively, at least one of the two hydrophobic elements, preferably the two opposite hydrophobic elements, may consist of an element brought into the vaporization chamber opposite or on the corresponding wall. They may be made of a PTFE sheet.

[0035] The hydrophobic element(s) may be fixed to the corresponding wall or not.

[0036] The hydrophobic element or at least one of the hydrophobic elements can be held in position by an immobilization device comprising in particular a centering element for said hydrophobic element with respect to the fluidic outlet, preferably the centering element comprises a centering half-pin formed in the vaporization chamber at the level of the corresponding wall or walls, in particular the body wall and the cover, and intended to cooperate with a notch of complementary shape formed in the hydrophobic element;

[0037] The vaporization system may include a connecting element, in particular a hydrophobic material, extending between the two opposing hydrophobic elements, in particular connecting them. The connecting element may cover, within the vaporization chamber, at least partially a side wall, in particular a side wall extending from one of the longitudinal ends of the vaporization chamber, in particular the body of the vaporization chamber. The side wall may be the one in which a feed opening extends, in particular an opening for a feed duct, as described below. This allows, in the case of one or more coatings, for a substantially continuous hydrophobic layer with few points of scale formation on the side wall containing the feed opening.

[0038] The connecting element can be a single piece with two opposing hydrophobic elements. The two hydrophobic elements and the connecting element can be formed from a hydrophobic material folded into a U-shape, with the two arms of the U forming the two opposing hydrophobic elements and the base of the U forming the connecting element. This easily allows for effective coverage of the vaporization chamber walls on both sides of the feed in a single sheet of insulation. Furthermore, the connecting element prevents scale formation upstream or at the fluid outlet.

[0039] At least one of the two opposing hydrophobic elements, preferably at least the hydrophobic element arranged on the wall against which the heating structure is superimposed, can extend over the entire width of the vaporization chamber. This provides a hydrophobic surface on the wall of the hottest vaporization chamber closest to the power supply system.

[0040] At least one of the two opposing hydrophobic elements, preferably at least the hydrophobic element arranged on the wall opposite to that on which the heating structure is superimposed, in particular covering at least partially the lid, can extend over a reduced width of the vaporization chamber. This allows The goal is to achieve a good compromise between hydrophobic properties, which limit limescale buildup near the water outlet, and vaporization performance through optimal heat exchange between the heating element and the interior of the vaporization chamber. Hydrophobic elements covering thermally conductive surfaces of the vaporization chamber necessarily limit heat transfer between the heating element and the chamber. By reducing the coverage area of ​​one of these surfaces with a hydrophobic element, it is possible to maintain good limescale reduction properties within the vaporization chamber while preserving excellent vaporization performance without increasing the heating element's temperature.

[0041] The two opposing hydrophobic elements may be different; in particular, one of the two opposing hydrophobic elements may have a narrower width than the other, specifically the hydrophobic element covering the lid having a narrower width than the one covering a wall of the body, as previously suggested. Alternatively, one of the two hydrophobic elements may be a coating and the other an element added within the vaporization chamber. Alternatively, the two opposing hydrophobic elements may have the same surface area on the corresponding wall, in particular being identical.

[0042] Alternatively, the hydrophobic element arranged on the wall to which the heating structure is superimposed has a larger surface area than the surface area of ​​the opposite hydrophobic element.

[0043] Preferably, one or both of the hydrophobic elements are planar, preferably substantially rectangular or triangular. They are preferably parallel to each other. The fluidic outlet can extend equidistant from the two hydrophobic elements.

[0044] At least one of the two opposing hydrophobic elements may have a three-dimensional shape comprising inclined planes. Alternatively, at least one of the two opposing hydrophobic elements may have a pyramid or truncated pyramid shape.

[0045] The two hydrophobic elements can be fixed relative to the corresponding wall, in particular by additional fixing elements extending over the corresponding wall(s) or by gluing. Alternatively, particularly in the case of a U-shaped sheet, at least one of the two hydrophobic elements, in particular the hydrophobic element extending opposite the lid, can be in the fluidic chamber without being fixed to the corresponding wall, only the part forming the hydrophobic element opposite the body wall being fixed to said wall by a fixing device as described above. Hydrophilic layer

[0046] At least one of the two opposite walls, preferably the wall of the vaporization chamber body, comprises a hydrophilic element, in particular at least partially between the wall and the corresponding hydrophobic element.

[0047] The hydrophilic layer(s) can extend over the opposite walls.

[0048] The hydrophilic layer(s) can extend over the entire width of the walls concerned.

[0049] The two opposing walls may comprise hydrophilic elements covered at least partially by the corresponding opposing hydrophobic elements. The opposing hydrophilic layers may comprise woven materials, preferably glass fabric. Power supply system

[0050] Preferably, the feed system comprises a feed conduit extending into the vaporization chamber through an opening in a side wall of the vaporization chamber, the fluid outlet being formed by the end of the feed conduit extending into the vaporization chamber.

[0051] The vaporization chamber may extend along a principal axis, in particular a longitudinal axis, the feed element, in particular the conduit, extending partially into the vaporization chamber at least partially along the principal axis. Alternatively, the feed conduit may extend into the vaporization chamber along a longitudinal axis offset laterally from the principal axis, in particular on the side opposite a distribution chamber, in particular a wall separating the vaporization chamber from a distribution chamber.

[0052] Preferably, the feed duct extends into the vaporization chamber for a length corresponding to substantially less than 50%, better less than 30%, even better less than 20%, even better less than 10%, of the length of the vaporization chamber. Such a length within the vaporization chamber allows the end of the duct to be positioned at the level of the hydrophobic elements so that the liquid falls onto one or the other of these hydrophobic elements.

[0053] The feed unit, in particular the feed conduit, may have a free end forming a point of injection of the liquid into the vaporization chamber.

[0054] Additionally or alternatively, the feed element, in particular the feed conduit, may be at least partially open on its side wall from a free end, the lateral opening having, in particular, a shape that allows liquid from the reservoir to flow into the vaporization chamber in the event of scale accumulation and deposit at the free end of the feed system, in particular the feed conduit. This limits obstruction of the feed system by allowing liquid to flow into the vaporization chamber. by a lateral opening. The lateral opening may include at least one slot extending along an axis substantially parallel to the feed system, in particular the feed duct, preferably at least two slots extending on either side of the feed system, in particular the feed duct, the at least two slots forming a plane extending preferably parallel to the internal surface of the vaporization chamber. The lateral opening may be a cutout in a half-section of the feed system, in particular the feed duct, extending along an axis substantially parallel to the feed system, in particular the feed duct, preferably the feed element, in particular the feed duct, is arranged in the vaporization chamber so that the cutout is on the side opposite the surface of the vaporization chamber heated by the heating structure.

[0055] The supply conduit can be beveled at its free end.

[0056] Alternatively, the feeding system is without a feed conduit. It may include an opening in a side wall of the vaporization chamber, in particular of the body of the vaporization chamber. In this case, the liquid is introduced into the vaporization chamber at the level of said side wall. Preferably, the side wall is a wall extending along one longitudinal end of the body.

[0057] A ratio between the height of the vaporization chamber and the inside diameter of the feed duct can be between 0.55 and 0.75. Heated structure

[0058] Preferably, the heating structure consists of one or more heating elements configured to heat, in particular by being in contact with or through a thermal transmission element or layer, in particular a thermal paste, an upper or lower wall delimiting the vaporization chamber, the lower and upper walls of the vaporization chamber constituting the opposite walls covered at least partially by the hydrophobic elements.

[0059] The heating element(s) may extend between the vaporization chamber and the inner surface of the jaw supporting it, the latter preferably comprising an internal heating plate. Thus, the heating element(s) simultaneously heat the internal treatment surface and the vaporization chamber. Alternatively, the heating element(s) are in contact with the wall of the vaporization chamber opposite the internal treatment surface. Alternatively still, the heating structure comprises at least two heating elements on either side of the vaporization chamber.

[0060] The heating structure can be superimposed on the vaporization chamber without protruding from the vaporization chamber.

[0061] The heating element(s) of the heating structure may include an electrical resistance known as Positive Temperature Coefficient (PTC) or a ceramic, in particular of the "Metal Ceramic Heaters" (MCH) type.

[0062] Preferably, the heating structure is configured to heat the vaporization chamber so that, during use, particularly during the introduction of the liquid into the vaporization chamber, the temperature in at least one zone of the vaporization chamber is always greater than or equal to the vaporization temperature of the fluid to be vaporized. The heating structure can be configured to heat said zone to a temperature between 100 and 200°C, preferably between 110 and 180°C.

[0063] The heating element(s) may have an electrical power rating of 50W or higher, or even 100W, 200W or 500W. In particular, the heating power of the heating elements is chosen so that, taking into account the flow rate of the incoming liquid and the temperature of the liquid, all of the liquid is vaporized continuously in the vaporization chamber as it enters it. Device

[0064] The device may include a single vapor outlet, in particular an elongated one, extending parallel to the main axis of the device and / or the vaporization chamber. Alternatively, the device includes a plurality of vapor outlets extending along at least one row of vapor outlets extending parallel to the main axis of the device and / or the vaporization chamber.

[0065] The vaporization system may include a steam distribution chamber separate from the vaporization chamber, in fluidic communication with the vaporization chamber and supplying steam to the steam outlet(s), the steam outlet(s) giving directly to the distribution chamber.

[0066] Preferably, the distribution chamber is unique in the device.

[0067] The distribution chamber can extend laterally to the vaporization chamber. The vaporization chamber and the distribution chamber can have parallel extension planes.

[0068] Alternatively, the device may comprise several parallel distribution chambers in fluidic communication with the vaporization chamber and each supplying steam to at least one steam outlet.

[0069] Preferably, the distribution chamber comprises an elongated hollow body forming a steam distribution rail, the hollow body comprising a steam inlet, preferably at one of its ends, in fluidic communication with the vaporization chamber, in particular at its end opposite to the supply member.

[0070] The body of the distribution chamber may include a partition wall common to the body of the vaporization chamber. Said partition wall of the chamber vaporization can form a side wall of the distribution chamber, the two chambers being connected to each other by an opening in said wall.

[0071] The body of the vaporization chamber and / or the distribution chamber may be made of a thermally conductive material, in particular metal. Preferably, the thermally conductive material has a thermal conductivity greater than 10 Wm'K1, better greater than 50 Wm'K1, even better greater than 100 Wm'K1.

[0072] Preferably, the heating structure does not overlap the distribution chamber.

[0073] Preferably, the device, in particular the handpiece, includes a jaw configuration detection element to detect whether the jaws are in the closed processing configuration or open, in particular a proximity sensor or a Hall effect sensor.

[0074] The detection organ can be arranged between the two arms at the level of the half-handles.

[0075] The device may include a liquid supply system for the vaporization chamber, in particular a pump. The supply system may be configured to supply the vaporization chamber based on its temperature and / or the time elapsed since the device was switched on and / or the configuration of the jaws. The supply system may be configured to supply the vaporization chamber only when the chamber temperature is above a predefined threshold temperature and / or when the time elapsed since the device was switched on is greater than or equal to a predetermined time corresponding, in particular, to the time required to reach a predefined threshold temperature of the vaporization chamber. The temperature of the vaporization chamber may be measured using a sensor located within the chamber, or at the interface between the heating structure and the vaporization chamber..

[0076] This control of the water supply according to the temperature makes it possible to limit the risk of applying liquid water instead of vapor.

[0077] The vaporization chamber feeding system can be configured to supply the vaporization chamber only when the jaws are closed. The feeding system can be configured to activate only if the jaw configuration detection device detects a closed jaw configuration, or to be blocked if the jaw configuration detection device detects an open jaw configuration.

[0078] Preferably, the feeding system is configured to operate at a constant flow rate at a predetermined flow rate.

[0079] The device may include a steam control element configured to control the application of steam to the hair. For example, the steam control element may control the flow of water into the vaporization chamber. When the user wishes to apply steam to their hair, they can activate the steam control element, which then controls, for example, a pump connected to the reservoir to supply the liquid to the vaporization chamber. As explained previously, this supply of liquid to the vaporization chamber may be subject to certain additional conditions as described previously, including a specific chamber temperature, after a certain ignition time, and / or depending on the jaw configuration. The control element may be operated by the user via a selector switch, for example, a two- or three-position button.

[0080] The device according to the invention may include a power supply. For example, the power supply is provided by means of accumulators and / or batteries and / or by means of an electrical cable connected to a mains socket or a mains adapter.

[0081] The power supply can in particular be used to power the heating structure, directly or indirectly via a control circuit.

[0082] The vaporization chamber body can be removably mounted on the device. The same applies to the heating plate if it is located on the same jaw and / or to the heating structure. They can be disassembled sequentially or assembled as a single removable unit. This facilitates maintenance of the device. Processing method

[0083] The invention also relates, according to another aspect, to a method of treating hair using a device as described above, comprising the application of steam to the hair through the steam outlet(s).

[0084] Preferably, the total flow rate of vapor exiting the vapor outlet(s) can be substantially constant as long as the vaporization chamber is supplied with liquid.

[0085] Preferably, the process is a hair straightening or curling treatment.

[0086] The characteristics of the device described above apply to the process in combination or individually.

[0087] Preferably, the method includes the detection of the jaw configuration and the application of steam is a function of the jaw configuration, in particular the application of steam is activated only when the jaws are in closed configuration.

[0088] The process can be repeated several times for the complete treatment of part or all of the hair.

[0089] The process may include one or more hair rinsing steps.

[0090] The method may include at least one step of applying a cosmetic product to the strand of hair before or after the use of the device of the invention, in particular a brush, and preferably before.

[0091] The cosmetic product may be a cleansing, coloring, bleaching, conditioning, or hair-styling composition. Preferably, the cosmetic product is a hair-styling composition, in particular a hair-curling, setting, or, preferably, hair-straightening or smoothing composition.

[0092] Cosmetic products usable according to the process of the invention can be liquids, gels, milks or creams in the form of simple (O / W or W / H) or multiple emulsions, solids.

[0093] The cosmetic product may contain one or more active agents selected from among reducing agents, and in particular thiols; oxidizing agents, and in particular hydrogen peroxide or persalts such as persulfates; coloring agents, and in particular pigments, direct colorants or oxidation colorants; non-durable shaping agents, and in particular styling polymers, preferably anionic, amphoteric or non-ionic; conditioning agents, and in particular silicones; mineral or vegetable oils; vegetable waxes; cationic surfactants or cationic polymers; alkali agents or acids. Even more preferably, the cosmetic product contains one or more agents selected from among oxidizing agents, reducing agents or alkali agents of the hydroxide type. Brief description of the drawings

[0094] Other features, objectives and advantages of the invention will become apparent from the following detailed description and with reference to the accompanying drawings, which are given by way of non-limiting examples and on which:

[0095] [Fig. 1] illustrates an overview of a hair treatment device as described in the present invention,

[0096] [Fig.2] represents a perspective view of the body of a vaporization system according to one embodiment of the present invention,

[0097] [Fig.3] is a cross-sectional view of the vaporization system shown in [Fig.1] according to a median plane, in use in the absence of scale in the vaporization chamber,

[0098] [Fig.4] is a cross-sectional view along a median plane of a variant of the system vaporization, when used in the absence of limescale in the vaporization chamber,

[0099] [Fig.5] is a perspective view of the vaporization system in the absence of the lid,

[0100] [Fig.6] shows a top view of the vaporization system of [Fig.5] without the lid, and

[0101] [Fig. 7] is a box plot of an average lifetime test between a device according to the invention and a device according to international application WO2020 / 127852. Detailed description

[0102] In the following description, identical elements or elements with identical functions bear the same reference numeral. For the sake of brevity, they are not described opposite each figure; only the differences between the embodiments are described.

[0103] In the figures, the actual proportions have not always been respected, for the sake of clarity.

[0104] Fig. 1 illustrates an exploded perspective view of a device 1 for processing, in particular for shaping hair, in particular for straightening, using steam to shape hair.

[0105] Device 1 illustrated is of the hair straightener type. However, the invention is not limited to such a device. A person skilled in the art will readily be able to apply the invention to another styling device, in particular to a curling or brushing device.

[0106] In the illustrated example, the device comprises a first arm 2 and a second arm 3 articulated to each other by means of a hinge-type joint 20. Each of the two arms 2 and 3 comprises a proximal half-handle portion including the joint and a distal portion forming, respectively, a first and second jaw 5 and 6 facing each other. The maximum opening angle (not shown) between the first and second arms is between 5° and 60°, preferably between 10° and 20°, and preferably approximately 15°. The jaws 5 and 6 can assume an open configuration corresponding to the maximum opening angle and a closed treatment configuration. The joint 20 may include an elastic retainer for holding the jaws 5 and 6 in the open position at rest.The user must therefore mechanically bring the jaws together so that they assume the closed configuration for processing hair.

[0107] A first non-visible processing surface is carried by the first jaw 5 and a second processing surface 4 is carried by the second jaw 6, the first and second surfaces being intended to pinch a strand of hair between them in the closed configuration of the jaws 5 and 6.

[0108] The first treatment surface and the second treatment surface 4 are generally complementary surfaces. They may have different shapes depending on the intended use of the styling appliance 1, and are preferably interchangeable. Typically, the treatment surfaces are flat for a The treatment device 1 can be used as a straightening device, or with curves (not shown) for use as a curling device, or with waves (not shown) for use as a crimping device. A curling device is described, for example, in document EP0619087. The treatment surfaces can also be textured, i.e., have multiple protrusions such as teeth or spikes (not shown).

[0109] The steam treatment device also includes a liquid reservoir, typically a water reservoir (not shown in [Fig.1]), or a reservoir containing a cosmetic agent, which can be mounted in one of the jaws, or alternatively be arranged remotely from the device in a so-called remote base, as envisaged in document EP3025610.

[0110] As illustrated in Figures 2 and 3, the liquid reservoir is in fluid communication with a liquid vaporization system 7 via a supply conduit 74. Advantageously, the liquid reservoir is included in the jaw comprising the liquid vaporization system 7.

[0111] The vaporization system 7 comprises at least one vaporization chamber 71, occupying a continuous volume in which vaporization takes place, i.e., a defined volume without discontinuities. The vaporization chamber 71 may be substantially parallelepiped-shaped, having, for example, a rectangular, square, or trapezoidal cross-section. This provides a good compromise between the compactness and efficiency of the vaporization system.

[0112] The vaporization chamber 71 extends for example along a principal axis X parallel to a longitudinal axis L of the device.

[0113] A so-called free end of the supply line 74 forms a fluid outlet 75 in the main vaporization chamber 71. Preferably, the supply line 74 protrudes inside the vaporization chamber 71 through an opening 77 in a side wall of the vaporization chamber, and the liquid contained in the reservoir can be injected into the main vaporization chamber 71 at the free end of the line in the vaporization chamber. The supply line 74 is therefore separate from the vaporization chamber 71; that is, it is not the same component. Typically, the liquid contained in the reservoir is water or a cosmetic product.

[0114] In an alternative not shown, the supply conduit 74 does not extend into the vaporization chamber, the liquid, in particular water, being introduced into the vaporization chamber through the opening 77.

[0115] The vaporization system further comprises a steam distribution chamber which is in communication with the vaporization chamber 7 and comprises one or more steam distribution orifices 78 in the direction of a wick of The distribution system 7' may, for example, include a distribution chamber 76 in vapor communication with the vaporization chamber 71, and in which at least one vapor distribution orifice 78 is disposed. The distribution chamber 76 may extend laterally to the vaporization system 7, preferably over substantially the entire length of the vaporization system 7. This provides a compromise between the compactness and efficiency of the vaporization and distribution systems 7.

[0116] The vaporization chamber 71 is preferably a compartment heated by a heating structure 8, for example a heating means 8 disposed in contact with the vaporization chamber 71, so that vaporization of the liquid injected into the vaporization chamber 71 can take place independently of the heating of other components of the hair styling device 1.

[0117] The heating structure 8 can for example be positioned under the vaporization system 7 as can be seen from the exploded view of [Fig.1].

[0118] The heating structure 8 can be arranged against the largest external surface of the vaporization system 7, preferably placed opposite the distribution orifices 78, and extend so as to be at least partially pressed against lateral surfaces of the vaporization system 7.

[0119] In general, vaporization is effective in the vaporization system 7 and in the vapor distribution system 7'.

[0120] Preferably, the vaporization system 7 has a maximum external volume of 110 x 35 x 12.5 mm. The heating structure 8 is, for example, designed to vaporize water in sequences of 10 seconds continuous and 10 seconds rest with a flow rate of around 1 g / min ± 0.5 g / min.

[0121] The vaporization system 7 may include a body 10 delimiting, with a lid 12, the vaporization chamber 71 and the distribution chamber 76. The body 10 and the lid 12 may be made of a metal, an alloy, or any heat-conducting material. Typically, the body and the lid of the vaporization chamber 10 are made of aluminum and may be produced by casting or extrusion.

[0122] The body and the lid can be sealed, for example by a silicone seal.

[0123] The vaporization chamber 71 can have two large walls delimiting its height H, an upper wall 81 formed by the lid 12 and a lower wall 83 formed by the bottom wall of the body 10. It also has two lateral walls 85 and 87 delimiting the vaporization chamber in width and two proximal and distal walls 89 and 91 forming longitudinal ends of the vaporization chamber 71 and delimiting the vaporization chamber 71 in length.

[0124] Advantageously, a spring blade allows the heating structure 8 to be crushed by the vaporization system 7, in order to ensure permanent contact and optimal operation.

[0125] The heating structure 8 can typically be an electrical resistance known as a Positive Temperature Coefficient (PTC) or a ceramic, but more generally any system allowing the vaporization chamber 71 to be heated in accordance with the desired purpose.

[0126] The heating structure 8 can be regulated by a thermistor, for example a negative temperature coefficient or NTC thermistor, functioning as a temperature probe, preferably arranged above the injection point. The thermistor can improve the safety of the hair styling device 1 by blocking the injection of liquid under specific conditions, for example, depending on the temperature of the heating structure 8. Typically, a lower temperature limit is approximately 95°C and an upper temperature limit is 130°C, or alternatively, within a narrower temperature range, a lower temperature limit of 105°C and an upper temperature limit of 120°C, or even 110°C.

[0127] Advantageously, the supply conduit 74 is centered on the main axis X of the vaporization chamber 71. The end of the supply conduit 75, forming the fluid outlet, is arranged approximately at the first third, or better yet, at the first tenth, of the length V of the vaporization chamber 71 along the main axis X. However, it could be otherwise. The conduit 74 could be offset laterally towards the side wall opposite the distribution chamber.

[0128] It is preferable to keep the fluid outlet away from the steam distribution means 7' in order to limit the risk of ejecting hot water that has not had time to vaporize. Preferably, the supply conduit 74 has an outer wall at least 1 mm away from the inner wall of the vaporization chamber 71, and the height of the vaporization chamber is greater than 8 mm, in order to limit scale buildup at the free end of the supply conduit 74 and thus prevent premature clogging.

[0129] The supply conduit 74 may be made of a material comprising, or coated with, a material to which scale adheres poorly, so as to limit scale buildup. Typically, the material chosen may be polytetrafluoroethylene (PTFE, also known by the registered trademark Teflon®), which has the advantage of excellent non-stick properties while being highly heat-resistant. Preferably, at least one internal wall of the supply conduit 74 is coated with PTFE, so that the supply conduit 74 is resistant to high temperatures, in particular above 300°C, and has an internal wall with a very low coefficient of friction, which limits the deposition of limescale on the internal wall of the supply conduit 74.

[0130] The feed conduit 74 preferably has a large internal cross-section to prevent premature clogging of the free end of the feed conduit 74, for example. The internal cross-section typically has a diameter greater than 3 mm, preferably greater than 4 mm. To limit heat transfer from the walls of the vaporization chamber 71 to the liquid, the wall of the feed conduit 74 may advantageously have a thickness greater than 1 mm. A ring with an internal cross-section of 6 mm and an external cross-section of 7 mm made of PPS (polyphenylene sulfide) may be attached to the feed conduit 74 to limit heat transfer to the internal wall of the feed conduit 74.

[0131] Preferably, a ratio between the height H of the vaporization chamber 71 at the level of the conduit 74 and the external cross-section of the supply conduit 74 is between 0.55 and 0.75; typically, the ratio is approximately 0.6 for a height of 4.9 mm and an internal diameter of 3 mm. Indeed, these dimensions have been optimized to ensure the best possible resistance to scaling while keeping the dimensions of the various components to a minimum.

[0132] Advantageously, the portion forming the free end of the supply conduit 74 can have a specific shape allowing the possible accumulation of scale to be concentrated in a specific area while providing an area where the liquid can continue to enter the vaporization chamber 71 without being hindered by the accumulation of scale.

[0133] For example, the feed conduit 74 is beveled at the free end forming the injection point, as illustrated in [Fig. 4]. Alternatively or additionally, the feed conduit 74 may include an opening extending substantially along the feed conduit from the free end forming the injection point. The opening has a shape that allows the liquid from the reservoir to flow into the vaporization chamber 71 even in the event of scale buildup and deposits at the free end of the feed conduit 74.

[0134] In one embodiment, the opening of the feed duct 74 is a cutout in a half-section of the feed duct 74, extending along an axis substantially parallel to the feed duct 74. In the embodiment illustrated in Figures 2 to 5, the feed duct 74 is arranged in the vaporization chamber 71 so that the cutout is on the side opposite the wall forming the bottom of the vaporization chamber 71. Typically, in an embodiment where the vaporization chamber 71 is closed by a plate forming a lid 12, this means that the cutout in the feed duct 74 is then oriented towards the plate forming the lid 12.

[0135] In the illustrated example, the lower inner wall 83 and the upper inner wall 81 of the vaporization chamber each have a hydrophobic element 100 and 110 covering them at least partially. The hydrophobic elements 100 and 110 extend along the feed channel 74, in particular its free end 11, on either side. Specifically, one of the hydrophobic elements 100 extends between the upper wall 81 and the channel 74, and the other of the hydrophobic elements 110 extends between the lower wall 83 and the channel 74. The hydrophobic elements 100 and 110 limit evaporation below the injection point at the surface closest to the outlet, thereby pushing it further into the vaporization chamber 71 and thus limiting scale buildup as close as possible to the injection point.

[0136] The hydrophobic elements 100 and 110 can be made of any hydrophobic material, in particular polytetrafluoroethylene (PTFE).

[0137] Preferably, the hydrophobic elements 100 and 110 are brought into the vaporization chamber 71. They can be formed of two separate, attached hydrophobic sheets, as illustrated in [Fig. 3]. In this case, the two hydrophobic elements 100 and 110 are preferably fixed to the corresponding walls 81 and 83.

[0138] Alternatively, the two hydrophobic elements 100 and 110 are connected by a joining portion 115, preferably also hydrophobic. The assembly can be a single piece and, in particular, formed from a single U-shaped sheet, as illustrated in [Fig. 4]. The joining portion 115 preferably extends over the proximal wall 89, which has the opening 77 and a through hole for the conduit 74. In this case, only one of the two hydrophobic elements 100 and 110, in particular the hydrophobic element 100 extending over the lower wall 83 of the body, needs to be fixed or held to the corresponding wall; holding one element and the joining portion 115 is sufficient in this case. This allows the U-shaped sheet to be assembled before closing the vaporization chamber with the lid. Indeed, such an assembly does not allow the hydrophobic element to be fixed between the conduit and the lid.

[0139] Advantageously, the added element(s) 100 or 110, in particular the hydrophobic element 100 extending over the lower wall 83 of the body, can be held in position in the vaporization chamber 71 by an immobilization device comprising a centering element 710 of the added element with respect to the injection point.

[0140] In the example of vaporization chamber 71 illustrated in figures 2 and 3, the centering element 710 includes a centering half-pin 710a formed in the vaporization chamber 71 and intended to cooperate with a notch 9a of complementary shape provided in the added element 100.

[0141] Alternatively, the hydrophobic elements 100 and 110 are formed by applying a hydrophobic material to the corresponding walls. Typically, the hydrophobic material can be applied in the manner of a paint or coating or sprayed onto the corresponding walls of the vaporization chamber 71.

[0142] The hydrophobic elements 100 and 110 can be substantially identical and cover the corresponding walls 83 and 81 over the entire width K of the vaporization chamber 71. Alternatively, the hydrophobic elements can be different, one being, for example, wider than the other. In particular, the hydrophobic element 110 can extend over the entire width K of the vaporization chamber and the hydrophobic element 100 can extend over a width K' less than that of the vaporization chamber 71 by being centered in the vaporization chamber above the feed duct 74, as illustrated in [Fig. 6].

[0143] Preferably, the hydrophobic elements 100 and 110 are planar, preferably substantially rectangular. They are preferably substantially parallel to each other. The fluidic outlet 75 can extend equidistant from the two hydrophobic elements 100 and 110.

[0144] In an alternative not shown, at least one of the two hydrophobic elements 100 and 110 may have a three-dimensional shape comprising inclined planes or a pyramid or truncated pyramid shape.

[0145] In the illustrated example, the hydrophobic element 110 extending over the lower wall 83 can overlap at least partially with the heating structure extending on the other side of the wall 83.

[0146] The vaporization system 7 may include, between one of the hydrophobic elements 100 or 110 and the corresponding wall, a hydrophilic element 120 extending over a larger surface area of ​​the wall than the corresponding hydrophobic element 100 or 110. This improves vaporization by limiting the risk that some of the liquid may not be vaporized in the vaporization chamber 71.

[0147] Advantageously, but not necessarily, and as illustrated in particular in Figures 2 and 3, the liquid vaporization system 7 may comprise a first vaporization volume 71 and a second vaporization volume 72, preferably separated from each other by a wall 121 forming a passage with a reduced cross-section between the two volumes 71 and 72 compared to at least the cross-section of the first volume 71. The first vaporization chamber 71 is then arranged upstream of the second vaporization chamber 72 in the direction of vapor flow. Preferably, the hydrophobic elements 100 and 110 extend into the first volume 71, in particular over the entire surface of the lower and upper walls extending into the first volume 71. The wall 121 can then constitute a scale barrier to the second volume 72.

[0148] Preferably, the second volume 72 includes discontinuities or obstacles by the presence of chicanes 73 to create a labyrinth-type path for steam.

[0149] A baffle 73 is defined as any obstacle or barrier placed in the chamber that creates irregular vapor flow, for example in a zigzag pattern, reducing the velocity of the vapor in the secondary vaporization chamber 72 and increasing contact with the surfaces of the various walls of the chamber 72. This allows any liquid droplets to be vaporized, thus ensuring complete vaporization of the liquid, as the heat exchange surface area is increased by the presence of the baffles 73. The baffles 73 can, for example, be arranged parallel to each other. This allows the vapor to flow in a regular pattern, thus trapping scale homogeneously in the second vaporization chamber 72.

[0150] Preferably, the first volume 71 is larger than the second volume 72, or even at least twice larger, so as to allow rapid vaporization in the first volume, and not to reduce the compactness of the vaporization system 7.

[0151] In this embodiment, the optional distribution chamber 76 can be arranged laterally to the vaporization chamber 71 and the secondary vaporization chamber 72, preferably over substantially the entire length of the vaporization system 7.

[0152] Such an arrangement and the corresponding operation are described in detail in document EP2591698.

[0153] In the examples described above, the supply conduit 74 has an opening with a cutout on a half-section. However, the invention is not limited to such a supply conduit. As illustrated in [Fig. 5], the supply conduit 74 can be a simple cylindrical conduit without a cutout and with an open end. The opening can be straight, as illustrated, or beveled.

[0154] The reader will have understood that many modifications can be made without materially departing from the new teachings and advantages described herein. Therefore, all such modifications are intended to be incorporated within the scope of the hairdressing apparatus presented. Examples

[0155] Comparisons between first vaporization systems Al to A10 and second vaporization systems B1 to B10.

[0156] The first Al to A10 vaporization systems correspond to the present invention. A lidless example is illustrated in [Fig. 6]. They comprise a U-shaped hydrophobic sheet arranged in the vaporization chamber with an element The upper hydrophobic element 100 is narrower than the hydrophobic element 110, the latter extending over substantially the entire surface of the lower wall within the first volume of the vaporization chamber. The feed duct extends into the vaporization chamber for a length of approximately 5 mm and has a non-beveled opening at its distal end, forming the injection point. The duct has no lateral opening.

[0157] The second vaporization systems B1 to B10 are as described in relation to patent application WO2020 / 127852. They comprise a hydrophobic element inserted into the vaporization chamber in the form of a flat sheet that identically covers only the lower wall of the vaporization chamber. The feed duct is also longer and has a wide lateral opening extending opposite the upper wall.

[0158] The different vaporization systems Al to A10 and B1 to B10 were used by injecting hard water through the supply line with an initial flow rate of 0.8 g / min. The flow rate of hard water consumed was measured over time until it decreased below 0.2 g / min. The volume of hard water consumed before reaching this flow rate was determined. The decrease in flow rate is indicative of significant scaling of the vaporization chamber, blocking the supply line. The volumes determined for each vaporization system are shown in the comparative table below. A mean and standard deviation are determined for the first vaporization systems Al to A10 and for the second vaporization systems B1 to B10 in the table below and are represented in the box plot in [Fig. 7]. Liters of hard water consumed before the flow rate falls below 0.2 g / min Product ABN#1 7.35 L 3.55 L#2 10.80 L 3.06 L#3 10.35 L 3.53 L#4 10.20 L 3.42 L#5 10.20 L 2.48 L#6 7.65 L 4.55 L#7 11.55 L 4.64 L#8 10.95 L 3.43 L#9 10.95 L 4.01 L No. 10 12.15 L 3.76 L Average 10.2 L 3.6 L Standard deviation 1.6 L 0.6 L

[0159] The first vaporization systems exhibit an average water consumption before the flow rate falls below 0.2 g / min of 10.2 L across 10 vaporization systems. The second vaporization systems exhibit an average water consumption before the flow rate falls below 0.2 g / min of 3.6 L across 10 vaporization systems. The difference between the two is significant and clearly demonstrates the improvement in lifespan of the vaporization system of the invention compared to those of the prior art.

[0160] The differences observed between the different first vaporization systems are due in particular to the vagaries of the manufacture of the different first vaporization systems for which the hydrophobic sheet was manufactured and introduced manually.

Claims

Demands

1. A hair treatment device (1), in particular for hair styling, especially for straightening and / or curling, comprising: - At least one steam outlet (78) configured to be adjacent to or in contact with the hair, - A vaporization system (7) in fluidic communication with the steam outlet, comprising a vaporization chamber (71) delimited by two opposing walls (81, 83), - A liquid reservoir, and - A liquid supply system (74) comprising a fluidic outlet opening into the vaporization chamber and configured to supply the vaporization chamber with liquid from the reservoir, the vaporization system (7) further comprising two opposing hydrophobic elements (100, 110) in the vaporization chamber (71) covering at least partially each of the opposing walls (81, 83), the fluid outlet (75) being disposed between the two opposing hydrophobic elements (100, 110).

2. Device (1) according to claim 1, wherein the vaporization system (7) comprises a body (10) delimiting at least partially the vaporization chamber (71) and a cover (12) configured to close an opening in the body (10), the body comprising at least one of the two opposite walls (81, 83) and the cover (12) comprising the other of the two opposite walls (81, 83), the body (10) and the cover (12) delimiting at least partially the vaporization chamber (71).

3. Device (1) according to any one of the preceding claims, wherein the two opposite walls (81, 83) are on either side of the smallest transverse dimension of the vaporization chamber at the level of the fluid outlet (75), in particular the height H.

4. Device (1) according to any one of the preceding claims, comprising a heating structure (8) for vaporizing the liquid contained in the vaporization chamber (71), the structure heating (8) superimposed on one of the two opposite walls (81, 83).

5. Device (1) according to any one of the preceding claims, wherein the opposite walls (81, 83) are the walls with the largest surface area of ​​the vaporization chamber (71), the opposite walls having in particular identical internal surfaces to the vaporization chamber.

6. Device (1) according to any one of the preceding claims, wherein the feed system comprises a feed conduit (74) extending into the vaporization chamber (71) through an opening (77) in a side wall of the vaporization chamber, the fluid outlet (75) being formed by the end of the feed conduit (74).

7. Device (1) according to the preceding claim, wherein the feed conduit (74) extends into the vaporization chamber (71) over a length corresponding to less than 50%, better less than 30%, even better less than 20%, even better less than 10%, of the length of the vaporization chamber.

8. Device (1) according to any one of the preceding claims, wherein at least one of the two opposing hydrophobic elements (100, 110), preferably both opposing hydrophobic elements, consists of a coating extending over the corresponding wall (81, 83), in particular a coating on a part of the body (10) of the vaporization system (7) and a coating on the cover (12) of the vaporization system (7).

9. Device (1) according to any one of claims 1 to 7, wherein at least one of the two opposing hydrophobic elements (100, 110), preferably both opposing hydrophobic elements, is made up of an element brought into the vaporization chamber (71) opposite or on the corresponding wall.

10. Device (1) according to the preceding claim, wherein the vaporization system (7) comprises a connecting element (115), in particular made of a hydrophobic material, extending between the two opposing hydrophobic elements (100, 110) and connecting the two opposing hydrophobic elements (100, 110) together, the connecting element (115) covering, in the vaporization chamber (71), at least partially a side wall, in particular the side wall in which a feed opening extends.

11. Device (1) according to the preceding claim, wherein the two hydrophobic elements (100, 110) and the joining element (115) are formed by a hydrophobic material folded into a U, with the two arms of the U forming the two opposite hydrophobic elements (100, 110) and the base of the U forming the joining element (115).

12. Device (1) according to any one of the preceding claims, wherein at least one of the two opposing hydrophobic elements (100, 110), preferably at least the hydrophobic element (110) covering at least partially a part of the body (10), extends over the entire width of the vaporization chamber (71).

13. Device (1) according to any one of the preceding claims, wherein at least one of the two opposing hydrophobic elements (100, 110), preferably at least the hydrophobic element covering the lid (12), extends over a reduced width of the vaporization chamber (71).

14. Device (1) according to any one of the preceding claims, comprising two jaws (5, 6) arranged opposite each other and articulated between a closed treatment configuration and an open hair engagement configuration between the jaws (5, 6), at least one of the jaws (5, 6) comprising the vaporization chamber (71).

15. A method for treating hair using a device according to any one of the preceding claims, comprising applying steam to the hair through the steam outlet(s).

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