EP2837302A1 - Heating part and hair styler - Google Patents

Abstract

There is provided a heating part (1) for a hair styling device for heating and shaping hair, comprising at least a first heating plate (1a) and a second heating plate (1b). The first heating plate (1a) and / or the second heating plate (1b) contain a vitreous or glass-like material, for example quartz glass. The first heating plate (1a) and the second heating plate (1b) are stacked on top of each other. Next, a hair styling device with such a heating part (1) is specified.

Description

The present invention relates to a heating part for a hair styling device comprising at least one heating plate of a glassy or glass-like material such as quartz glass for heating and shaping hair.

Hair styling devices with heating parts for hair forms, such as hair straighteners, are well known. The hairs to be formed are pulled along the heating part of the device along, the smoothing effect depends inter alia on the transmitted from the plate to the hair pulling force. In order to avoid hair damage, which may occur with a rough surface structure of the heating part, the material of the heating part is advantageously selected accordingly. For example, a glass-like or glass-like material, in particular quartz glass, is suitable for a smooth surface structure.

However, conventional quartz glass plates are not suitable as heating plates of hair straighteners because they are much more sensitive than conventional heating plates made of, for example, aluminum. In particular, a quartz glass plate tends to break or crack under heavy load. For example, small cracks form in the quartz glass plate, which can spread further with each load and ultimately lead to glass breakage.

The object of the present invention is therefore to provide an improved heating element made of a glassy or glass-like material for a hair styling device, which is characterized by a more reliable application, in particular by a reduced risk of cracking.

This object is achieved by a heating element with the features of claim 1. Furthermore, this object is achieved by a hair styling device with the features of claim 9. Advantageous developments of the invention are the subject of the dependent claims.

According to the invention, a heating part for a hair styling device for heating and shaping hair is specified, which comprises at least a first heating plate and a second heating plate includes. The first heating plate and / or the second heating plate contain a vitreous or glass-like material, preferably quartz glass. The first heating plate and the second heating plate are stacked on top of each other.

For the purposes of this application, a "quartz glass" is to be understood in particular to mean a one-component glass which, apart from possible impurities, consists of pure SiO ₂ . The heating plates of the heating element need not necessarily consist of quartz glass, but can only contain quartz glass. In addition, both heating plates do not necessarily contain or consist of quartz glass. It may also contain only one of the heating plates of quartz glass or consist of it. For example, one of the heating plates may be made of quartz glass and the other heating plate of another glass such as borosilicate glass or of a glass-like material such as glass ceramic, which complements the properties of the quartz glass plate.

Both hotplates preferably contain or consist of quartz glass. The two heating plates made of quartz glass can differ in their properties and in particular complement their properties.

For the purposes of this application, a "heating part" is understood to mean a device part which can be heated and is used for hair styling. In particular, the heating part has a heatable hair treatment surface, which is preferably flat or smooth for shaping the hair, so that the hair can be pulled over it for straightening. The heating part preferably has a plate shape. This means that the heating part is preferably cuboid.

According to the invention, the heating part is composed of at least two heating plates or is formed from these. The heating part accordingly has a multilayer plate structure, preferably a glass plate construction. For the purposes of this application, "hotplates" are to be understood as plates which have sufficiently high thermal conductivity such that hair shaping on a surface of the plates is possible. A heater such as a heating layer is formed on an opposite surface of the hair-shaping plate, so that the of the Heating produced heat through the plate preferably as homogeneous as possible spreads to the hair treatment area.

The heating plates of the heating element are preferably stacked directly above one another. By "stacked" in the sine of this application is to be understood in particular that the heating plates are arranged one above the other, wherein between the heating plates additional layers can be introduced. However, the heating plates are firmly connected, that is fixed to each other. The heating plates can not be opened by the user or move away from each other.

Due to the multi-layer structure of the heating element according to the invention, any cracks that can form in a heating plate due to greater stress can not spread from one heating plate to the other heating plate, or skip. A crack thus does not extend through the entire heating part, but at most extends over one of the heating plates. This makes it possible to choose as the material of the heating plates sensitive quartz glass, which is particularly gentle on the hair to be treated and thus reduces the risk of hair damage. In the case of a mechanical impact such as, for example, a fall-off of the hair styling appliance having the heating element according to the invention, the risk of breakage of the complete heating element is advantageously reduced according to the invention.

Preferably, the heater such as a heating layer is arranged on one of the hair treatment surface opposite side of the heating. Due to the multi-layered construction of the heating element, a complete breakage of this heating element and a consequent exposure of the current-supplying parts of the heating can be prevented with a mechanical stress of the heating element. The risk of electric shock is thereby advantageously significantly reduced.

In a preferred development of the invention, an intermediate layer is introduced between the first heating plate and the second heating plate. In this case, the heating part accordingly has the following multilayer structure: first heating plate, intermediate layer, second heating plate. In this case, the individual layers of the heating element are advantageously each arranged directly on one another and fastened or fixed to one another arranged to each other. Accordingly, no detachable connections are formed between the individual layers.

The intermediate layer may have different properties depending on the desired requirement. For example, the intermediate layer has adhesive properties and thus serves for fastening or gluing the first heating plate to the second heating plate. Alternatively or additionally, the intermediate layer may be a heating layer, which is provided for heating the entire heating part. As an alternative or in addition, the intermediate layer can have a high thermal conductivity. Preferably, a uniform and homogeneous heating for the heating part is realized by the intermediate layer.

In a further preferred embodiment of the invention, the intermediate layer is a film or a gel. Between the two heating plates thus the film or gel is introduced. Advantageously, the intermediate layer is an adhesive film. With an adhesive film between the two heating plates, a type of composite material can be produced, as is known, for example, in safety glass or car windows. As a result, the breaking strength of the heating part can advantageously be increased.

In a further preferred development of the invention, the intermediate layer comprises aluminum, silver and / or gold. These materials are characterized by a high coefficient of thermal conductivity, which advantageously allows a uniform surface temperature of the heating element. This uniform surface temperature in turn advantageously leads to an improved and uniform styling result in the hair treatment.

As a further material of the intermediate layer is inter alia copper in question. Additionally or alternatively, the intermediate layer may be coated. For example, a carbonaceous coating such as diamond, graphite, graphene and / or carbon nanotubes (CNTs) is used. Also, a ceramic coating of, for example, silicon carbide and / or aluminum nitride usable.

In a further preferred development of the invention, the intermediate layer has transparent properties. Particularly preferably, the intermediate layer transparent properties for radiation in the visible wavelength range. Under transparent is to be understood in particular that the material of the intermediate layer and therefore the intermediate layer is at least partially transparent to radiation even for radiation in the visible wavelength range. Preferably, the intermediate layer is at least 50%, preferably at least 70%, particularly preferably at least 95% radiation-permeable. The intermediate layer preferably has a transparent silicone and / or polycarbonate.

In a further preferred embodiment of the invention, the intermediate layer is a heating layer which is suitable for heating the heating plates of the heating part. Preferably, the heating part to a plurality of heating layers, which differ in their properties and can complement. For example, a heating layer with low voltage and a second heating layer with low voltage is fed. Each heating layer and heating plate can alternately alternate. This means that the heating part has a layer stack as follows: first heating layer, first heating plate, second heating layer, second heating plate. In the case of more than one heating layer of the heating part, it is advantageous to provide a uniformly heatable hair treatment surface and a low cooling, as well as the possibility of rapid reheating when using the heating part.

In a further preferred development of the invention, the second heating plate has a hair treatment surface. Preferably, the hair treatment surface is the surface of the second heating plate opposite to the first heating plate. A hair treatment surface is to be understood in particular as the surface on which the hairs to be formed are heated and shaped. In particular, the hairs to be formed are pulled directly over the hair treatment surface or clamped on this surface and pulled along.

Preferably, the second heating plate with the hair treatment surface has a smaller thickness than the first heating plate. The thickness of the heating plate is the extent of the heating plate perpendicular to the hair treatment area. Due to the smaller thickness of the second heating plate with the hair treatment surface advantageously a uniform surface temperature on the hair treatment surface and thereby conditionally an optimal styling result can be achieved.

In a further preferred development of the invention, the heating part has at least one further heating plate, which is arranged above the second heating plate. In this case, the further heating plate on the hair treatment area. The second heating plate is inserted between the first heating plate and the further heating plate. Advantageously, when using multiple heating plates, the temperature difference between the bottom and top of each heating plates low, which are low internal stresses in the heating with advantage. This reduces the requirement for the material of the heating plates with respect to the coefficient of thermal expansion, which advantageously increases the selection of suitable glass materials.

In a further preferred development of the invention, at least one sensor for detecting damage to the first and / or second heating plate is arranged between the first heating plate and the second heating plate. If the sensor detects damage, the heating part is preferably switched off. This can advantageously be arranged on one of the heating plates or on both heating plates, an electrically conductive layer, for example, be painted or vapor-deposited, which is combined to form a circuit and monitored by means of the sensor. If the circuit is interrupted, the entire heating of the heating element can be switched off automatically. This reduces the risk of electric shock with advantage. Particularly preferably, a plurality of sensors is arranged between the heating plates, which are suitable and aligned for detecting damage to the first and / or second heating plate.

In a further preferred embodiment of the invention, the heating part is part of a hair styling device that is used for smoothing, waves or curls of the hair. The hair styling device is preferably a hair straightener. The heating element according to the invention is arranged on a device arm of the hair straightener. A device arm opposite this device arm can additionally have a second heating element according to the invention, so that the hairs to be treated can be heated and shaped between the device arms on the two heating parts.

Figuren 1 bis 5

jeweils einen schematischen Querschnitt eines Ausführungsbeispiels eines erfindungsgemäßen Heizteils.

Further advantages, advantageous embodiments and further developments of the heating element will become apparent from the following in connection with the FIGS. 1 to 5 described embodiments. Show it

FIGS. 1 to 5

each a schematic cross section of an embodiment of a heating element according to the invention.

In the exemplary embodiments and figures, identical or identically acting components may each be provided with the same reference numerals. The illustrated components and their proportions to each other are basically not to be considered as true to scale. Rather, individual elements such as layers, parts, elements, components and areas for exaggerated representability and / or for better understanding can be shown exaggerated thick or large dimensions.

FIG. 1 shows a heating element 1 according to the invention in cross section, which comprises a first heating plate 1a and a second heating plate 1 b. Accordingly, the heating element 1 has a multilayer structure in contrast to conventional heating plates.

The conventional one-piece heating parts are relatively sensitive due to their individual panel construction and tend to break or crack under greater stress. Therefore, conventional heating parts are limited in their choice of materials, since only low-sensitivity materials come into question.

According to the invention increases the material selection by the multilayer structure of the heating part 1, as so advantageously a possibly forming crack does not pull through the entire heating part, but advantageously only by one of the two heating plates 1a, 1b. In particular, a crack in one of the heating plates 1a, 1b can not jump over to the other heating plate 1a, 1b.

The heating plates 1a, 1b preferably contain quartz glass. Particularly preferably, both heating plates 1a, 1b are made of quartz glass. Here, the quartz glass plates 1a, 1b have different properties that complement each other with advantage in their properties. It is alternatively also possible that one of the two heating plates 1a, 1b is not is of quartz glass but of another material such as another glass, for example borosilicate glass, or a glass-like material, for example glass ceramic, which complements the properties of the quartz glass plate.

Due to the multilayer structure of the heating part 1, the quartz glass plates 1 a, 1 b strengthened so that they do not break in a mechanical shock, as may occur, for example, in a fall of the heating, for example, a sink, and thus any current-carrying parts, usually are arranged on one of the second heating plate 1b opposite side of the first heating plate 1a, openly accessible and so become a high security risk to the user.

The heating part 1 preferably has a hair treatment surface 3 on the second heating plate 1b, at which hair is heated and shaped during operation of the heating part. For this purpose, the heating part 1 is integrated in a hair styling device, in particular in a hair straightener. The heating part 1 is mounted with the first heating plate 1a on a device arm of the hair straightener, so that the hair treatment surface 3 of the heating part 1 is accessible for hair shaping.

The heating part 1 of FIG. 2 differs from the heating part of the FIG. 1 by an intermediate layer 2 disposed between the first heating plate 1a and the second heating plate 1b. The intermediate layer 2 is preferably a film, a gel, a layer of transparent silicone or polycarbonate. The intermediate layer 2 can also be an adhesive film, by which a kind of composite material is realized, as is usual in safety glass or a car glass pane. This advantageously improves the breaking strength of the heating part 1 significantly.

The heating part 1 of FIG. 3 differs from the heating part of the FIG. 1 by an intermediate layer 2, which is introduced between the heating plates 1a, 1b. The intermediate layer 2 is preferably a foil of aluminum, copper, silver or gold or a foil comprising a carbonaceous material such as graphite, diamond, CNTs or graphene. The film thus advantageously has a high thermal conductivity. This advantageously allows a uniform surface temperature at the hair treatment surface 3, resulting in an improved, in particular optimal styling result of the hair to be formed. In this case, a thickness is preferable D1 of the first heating plate 1a is larger than a thickness D2 of the second heating plate 1b. The heating plate 1 b with the hair treatment surface 3 is accordingly made thinner than the remaining heating plate 1 a of the heating part 1.

The heating part 1 of FIG. 4 differs from the heating part of the FIG. 1 by a first intermediate layer which is introduced between the heating plates 1a, 1b and is formed as a first heating layer 2a. In addition, the heating part 1 has a second heating layer 2b, which is arranged on the second heating plate 1 b opposite side of the first heating plate 1a. The heating part 1 is thus composed by alternately arranged heating layers 2a, 2b and heating plates 1a, 1b. The heating layers 2a, 2b can have different properties. For example, one of the heating layers 2a, 2b, preferably the first heating layer 2a, with low voltage and the other of the heating layers 2a, 2b, preferably the second heating layer 2b, fed with low voltage. The first heating layer 2a advantageously leads to a more uniform surface temperature of the hair treatment surface 3, to less cooling and to rapid reheating when using the heating element 1, for example in a hair straightener.

The heating part 1 of FIG. 5 differs from the heating part of the FIG. 1 by another heating plate 1c disposed on the second heating plate 1b. The heating part 1 accordingly has a three-layered structure in which the individual heating plates 1a, 1b, 1c are stacked on top of each other. An area of the further heating plate 1c facing the second heating plate 1b forms the hair treatment surface of the heating part 1. The use of a plurality of heating plates 1a, 1b, 1c is characterized by small temperature differences between the bottom and top of the individual heating plates 1a, 1 b, 1 c. As a result, it is advantageous to reduce internal stresses in the heating part 1, which reduces the requirements with regard to the choice of material and, in particular, with regard to the thermal expansion coefficient of the heating plates 1a, 1b, 1c. Advantageously, this increases the glass material selection. As a result, impact-resistant hot plates made of glass can be provided with advantage.

In the embodiments of the FIGS. 1 to 5 may be incorporated between the individual heating plates sensors (not shown) that detect damage to a single hot plate and the associated hair styling device in which the heating element is disabled, in case of detection switch off. Thus, the individual heating plates can be provided with a conductive layer, which is combined to form a circuit and monitored. If the circuit is interrupted, the hair styling device can automatically switch off the entire heating. The risk of electrocution for the user of the hair styling device is thus significantly reduced with advantage.

The multi-layer heating parts 1 of FIGS. 1 to 5 may preferably have a total of a similar or even the same thickness as conventional one-piece heating parts, so that overall the dimensions of the heating element and the hair styling device, in which the heating element is installed, do not change drastically, in particular increase.

The explanation of the heating element according to the invention with reference to the embodiments described above is not to be regarded as limiting the invention to these. Rather, the invention encompasses any novel feature as well as any combination of features, which in particular includes any combination of features in the patent claims, even if this feature or combination itself is not explicitly stated in the patent claims or the exemplary embodiments.

LIST OF REFERENCE NUMBERS

1

heating

1a

first heating plate

1b

second heating plate

1c

another heating plate

2

interlayer

2a

first heating layer

2 B

second heating layer

3

Hair treatment area

D1

Thickness of the first heating plate

D2

Thickness of the second heating plate

Claims (10)

Heating part (1) for a hair styling device for heating and shaping hair, comprising at least a first heating plate (1a) and a second heating plate (1b), wherein the first heating plate (1a) and / or the second heating plate (1b) is a vitreous or glass-like material included, and the first heating plate (1 a) and the second heating plate (1 b) are stacked one above the other. Heating element according to claim 1, wherein
between the first heating plate (1a) and the second heating plate (1b) an intermediate layer (2) is introduced. Heating element according to claim 2, wherein
the intermediate layer (2) is a film or a gel. Heating element according to one of the preceding claims 2 or 3, wherein the intermediate layer (2) is an adhesive film and / or a heating layer. Heating element according to one of the preceding claims 2 to 4, wherein the intermediate layer (2) comprises a transparent silicone, a composite material, polycarbonate, aluminum, copper, silver, gold, silicon carbide, aluminum nitride and / or at least one carbonaceous material. Heating element according to one of the preceding claims, wherein - The second heating plate (1 b) has a hair treatment surface (3), and - The second heating plate (1b) has a smaller thickness (D2) than the first heating plate (D1). Heating element according to one of the preceding claims, wherein
the heating part (1) has at least one further heating plate (1 c) which is arranged above the second heating plate (1 b). Heating element according to one of the preceding claims, wherein
between the first heating plate (1a) and the second heating plate (1b) at least one sensor for detecting damage to the first and / or second heating plate (1a, 1b) is arranged. Hair-styling device with at least one heating part (1) according to one of the preceding claims. A hair styling device according to claim 9, which is a hair straightener.

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