EP2696720A1

EP2696720A1 - Hair-shaping-appliance heating plate

Info

Publication number: EP2696720A1
Application number: EP12721777.6A
Authority: EP
Inventors: Thomas Copitzky; Berthold Altmann; Daniela Blischke; Christian Hafer; Frank JÖRDENS; Philipp Schaller; Gerhard Schmidmayer
Original assignee: BSH Bosch und Siemens Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2011-04-14
Filing date: 2012-04-04
Publication date: 2014-02-19
Anticipated expiration: 2032-04-04
Also published as: WO2012139958A1; EP2696720B1; DE102011007375A1

Abstract

The invention provides a hair-shaping-appliance heating plate (4) which has: a carrier plate (6), with a first main surface (6a) and a second main surface (6b), at least one electrically insulating insulation coating (7), which is fitted on the first main surface (6a), and an electric panel-heating means (8), which is applied as a coating and is arranged on that side of the at least one electrically insulating insulation coating (7) which is directed away from the carrier plate (6).

Description

The hair styling appliance heating plate

The present invention relates to a hair styling hot plate.

There are various heatable hair-styling devices are known, which are adapted to assist under the action of heat and possibly additionally by mechanical action in a hair styling of hair or to help bring hair into a desired shape or give it a desired appearance ,

Hair straighteners are particularly known in which by introducing heat and simultaneously exerting a mechanical force, the hair to be treated are smoothed to give the hair the desired appearance. Such hair straighteners have at least one heating plate, which is usually electrically heated. In this case, the at least one heating plate usually has at least one essentially planar, flat section which is brought into contact with the hair to be smoothed during operation. Known hair straighteners usually have a further plate which is movable against the at least one heating plate, that between the at least one heating plate and the other plate to be smoothed hair can be introduced and pressed the hair introduced through the further plate against the at least one heating plate can be. The further plate may in particular also be designed as a heating plate in order to provide a uniform heat input on both sides into the hair to be smoothed. Such hair straighteners often have a forceps-like shape, which makes it possible with one hand to move the at least one heating plate and the other plate, including hair between them against each other.

In addition to the hair straightener described other heated hair styling devices are known. For example, DE 10 2008 043 428 A1 describes a heatable hair styling device that can be used both for straightening hair as a heating iron or hair straightener and as a curler for shaping curls (Multistyling device).

In a conventional hair styling hotplate system, in particular for a hair straightener, an extruded profile made of an aluminum alloy is often provided, one side of which is formed as a user surface adapted to contact the hair to be formed. The user interface may in particular also be provided with a coating. In the cavity of the extruded profile in such a heating plate system, an electrical heating element is pressed, wherein the electrical heating element is electrically insulated from the extruded profile, for example by means of an electrical heating element sheathing electrically insulating film.

It is an object of the present invention to provide a hair styling hot plate, which is cheaper to produce and has an improved heating behavior, and to provide a heatable hair styling device with such a heating plate.

The object is achieved by a hair styling hot plate according to claim 1. Advantageous developments are specified in the dependent claims. The hair styling hot plate comprises: a backing plate having a first major surface and a second major surface, at least one electrically insulating insulating coating applied to the first major surface, and a side of the at least one electrically insulating one remote from the backing plate

Insulation coating arranged, applied as a coating electrical

Surface heating.

Since the hair styling hot plate has the support plate and the insulation coating and the electric surface heating are each applied as a coating, a particularly compact design of the hair styling hot plate is achieved. Due to the compact design, which has only a small mass and in which also low

Heat transfer resistances between the materials can be achieved, a particularly rapid heating and also a particularly rapid reheating after heat removal are achieved. At the same time this can be done with efficient use of the supplied electrical energy. The backing plate provides high mechanical stability even with a thin construction of the entire hair styling hot plate. Furthermore, the hair styling hot plate can be manufactured inexpensively with low material usage and with well-known coating processes. As the electrically insulating

Insulation coating is provided, is an electrically conductive contact between the Support plate and the live components of the electrical

Surface heating reliably prevented, so that the support plate can also be made of an electrically conductive material, in particular metal.

As a material for the support plate are in particular different metals or

Metal alloys preferred because they have a high thermal conductivity and thus both a rapid heating and a desired temperature distribution can be achieved within the plate level. In particular, the carrier plate can be made of a enameling suitable steel. It is e.g. but also possible to manufacture the carrier plate made of stainless steel or aluminum or an aluminum alloy. In particular, aluminum or an aluminum alloy allows a particularly rapid heating and reheating of the hair styling hot plate. On the other hand, in particular the use of steel allows a particularly cost-effective implementation. In particular, depending on the type of manufacture used and the application, the support plate may have a substantially planar shape, but a non-planar (e.g., curved) configuration, particularly the edges of the support plate, will allow for an increase in mechanical stability. Further, in this way deformation of the heating due to different thermal

Expansion coefficients are counteracted. The electrically insulating insulation coating is also applied in the form of a coating. The layer thickness of the insulation coating is chosen such that a sufficient high-voltage resistance is given. The insulation coating may e.g. by screen-printable dielectrics, by one or more electrical insulating enamel coatings, by one or more thermally sprayed or vapor-deposited ceramic layers, etc. Optionally, electrically insulating organic or Si-containing materials may also be used.

For the formation of the applied as a coating electric surface heating also different materials can be used, which are suitable in terms of their processability and their electrical conductivity to form a surface heating. There are, among others, Ag-containing screen printing pastes (possibly with additives such as Pt or Pd), thermally sprayed CrNi layers and vapor-deposited or

sprayed tin oxide layers in question. For the geometry of the electric Surface heating are also different embodiments possible, in particular from the electrical resistance of the material of the surface heating and of the

Depend on the layer thickness. The electric surface heating preferably extends essentially two-dimensionally along the surface of the metallic carrier plate. According to one embodiment, on the second main surface of the carrier plate a trained for the contact with forming hair surface is formed. By providing the user surface on the second main surface of the carrier plate, a particularly compact construction is achieved in which heat transfer resistances can be minimized. The user surface may e.g. by an enamel coating, by a paint applied to the surface, by a thermally sprayed layer, by a vapor-deposited layer, etc. Preferably, the utility surface is formed as a coating formed on the carrier plate. The coating can be provided directly on the second main surface, it is e.g. but also possible to provide one or more intermediate layers (e.g., as a primer, etc.). The material of the coating can preferably be electrically insulating, so that the user safety is additionally increased. For example, the material of the coating may conform to the material of the electrically insulating insulation coating, depending on the material of the electrically insulating insulation coating.

According to one embodiment, the electric surface heating has at least one layer of an electrically conductive material. The electric surface heating can thus be made very thin and with low material requirements. The electrically conductive material is chosen such that it has a resistance at the given layer thickness and the given structuring, which releases the required amount of ohmic heat upon application of a desired supply voltage. The at least one layer of the electrically conductive material need not be formed contiguous, but it may be formed from the at least one layer also different separate, possibly. Independent of each other electrical heating elements or heating zones. The electrically conductive material may be applied during manufacture by known coating techniques. For example, it is also possible to provide a plurality of layers of a single or different electrically conductive materials one above the other in order to form the electric surface heating. The at least one layer of the electrically conductive material may preferably have a substantially constant layer thickness over its entire extent, which may be advantageous in terms of uniform heating and a long service life. However, it is also possible, for example, to provide specifically different layer thicknesses in order to achieve a desired temperature distribution on the surface. The layer of electrically conductive material may be formed, for example, as a large-area coating of the surface, but the layer may also have other designs, for example, be formed as a meandering or otherwise running conductor track on the surface. It can also be selectively selected another form of the layer to achieve a desired temperature distribution.

The electric surface heating preferably has at least one electrically contacted flat printed conductor as an electrical heating element. According to one embodiment, a plurality of electrically conductive contact surfaces for electrical contacting of the at least one planar conductor track is applied as a coating. The electrically conductive contact surfaces have a lower specific electrical resistance than the planar conductor track, which forms the electrical heating element, thus have a high electrical conductivity in comparison. In particular, the contact surfaces may be formed by a metal or a metal alloy with high conductivity, such as Ag. In particular, two electrically conductive contact surfaces can be provided for an electrical heating element. In the case of a plurality of electrical heating elements, respectively assigned electrically conductive contact surfaces can be provided, wherein, for example, an electrically conductive contact surface can also contact a plurality of electrical heating elements. The electrically conductive contact surfaces can be applied using a known coating technology. The contact surfaces are arranged such that they are in the largest possible possible contact with the respective planar conductor track. It is also possible, for example, to additionally provide regions of the material of the contact surfaces in predetermined regions of the planar conductor track in order to locally lower the electrical resistance there. This can be used, for example, to stabilize the conductor track, for example in a region with a low cross-section parallel to the surface, ie to increase the service life, or to specifically influence the temperature distribution that forms on the user surface. According to one embodiment, a second electrically insulating insulation coating is applied to a surface of the electric surface heating which faces away from the carrier plate. The second electrically insulating insulation coating may be formed from the materials already described with respect to the first electrically insulating insulation coating. The second electrically insulating insulation coating may, for example, be formed from the same material as the first electrically insulating insulation coating described above. By providing the second electrically insulating insulation coating, the safety for users is additionally increased, since the electrical surface heating electrical surface heating is electrically insulated from the outside and thus a protection against contact is given.

According to one embodiment, the carrier plate has an at least substantially flat plate shape. In the present case, a substantially flat plate shape is understood to mean a shape in which a large part of the carrier plate (> 90%) is flat or only slightly curved and, if necessary, a peripheral region is formed. A substantially flat plate shape is particularly advantageous when the electrically insulating insulation coating and / or the electric surface heating and / or the user surface is applied by means of a coating process which requires a substantially planar substrate, as e.g. among other things in screen printing is the case.

According to one embodiment, the electric surface heating has a plurality of spatially separated, electrically contacted conductor tracks as electrical heating elements. In this case, a plurality of electric heating elements is provided and with a different shape of the electric heating elements (especially in the direction parallel to the support plate), the temperature distribution that results on the user surface can be adjusted specifically. According to a further development, the various heating elements can also be contacted independently of each other, so that even in the finished hair styling hotplate still different temperature profiles, for example by a separate control and / or control of the separate heating elements, can be generated. The object is also achieved by a hair styling device according to claim 10. The hair styling device has at least one hair styling hot plate according to one of the preceding claims. The hair styling device is designed such that hair to be formed can be guided along the second main surface. Preferably, the hair styling device is designed such that the hair to be formed can be guided while exerting pressure in the direction of the hair straightener heating plate along the second main surface. In a preferred embodiment, the hair styling device is designed as a hair straightener. In a preferred embodiment, the hair styling device has at least two hair styling device heating plates, between which hair to be formed can be enclosed for shaping.

Further advantages and developments will become apparent from the following description of embodiments with reference to the accompanying drawings.

1 is a schematic representation of a hair styling device,

FIG. 2 is a diagram for explaining the structure of a hair styling hot plate according to an embodiment; FIG.

Fig. 3 a) to c) are schematic representations of exemplary cross-sectional shapes of a

Support plate according to the embodiment,

4 is a schematic diagram of an electric surface heater having a configuration according to the embodiment;

Fig. 5 is a schematic representation of an electric surface heating with a

Design according to a first modification of the embodiment,

FIG. 6 is a schematic diagram of an electric surface heater having a structure according to a second modification of the embodiment and FIG

FIG. 7 is a schematic diagram of an electric surface heater having a configuration according to a third modification of the embodiment. FIG.

Hereinafter, an embodiment will be described with reference to FIGS. 1 to 4. Fig. 1 shows a heatable hair styling device 1 according to the embodiment. In the embodiment, the hair styling device 1 is constituted by a hair straightener. The hair styling device 1 has a forceps-like structure with a first arm 2 and a second arm 3, which are connected to each other via a hinge on. The first arm 2 and the second arm 3 are connected to each other via the joint such that a free End 2a of the first arm 2 and a free end 3a of the second arm 3 are movable toward and away from each other, as shown schematically in Fig. 1 by an arrow. On the first arm 2 and on the second arm 3, a hair styling hot plate 4 is provided, which will be described in more detail below. The hair styling device 1 is designed such that the hair styling device heating plates 4 are electrically heated. For supplying electric power, a cable 5 for an electric power supply is provided on the hair styling device 1. The hair styling device 1 is designed to bring the hair to be smoothed between the two hair styling hotplates 4, the two hair styling hotplates 4 are moved towards each other, including the hair between them and the hair by heat and, if necessary, exercise a slight mechanical pressure be smoothed to obtain a suitable tensile force.

In the following, a hair styling hot plate 4 will be described in more detail by way of example. Fig. 2 is a schematic diagram for explaining the structure of the Haarformgerät- hot plate 4 in the embodiment. FIG. 2 merely serves to explain the sequence of layers and does not necessarily correctly reflect the size relationships.

The hair styling hot plate 4 has a support plate 6, to which the other components of the hair styling hot plate 4 are applied as coatings. The support plate 6 has a first main surface 6a and a second main surface 6b. The support plate 6 may be made, for example, of a metallic material, in particular of an enamelable steel, stainless steel, but preferably of aluminum or an aluminum alloy. The support plate 6 has a substantially planar cross-sectional shape, which is flat or only slightly curved, at least in a majority. 3 shows exemplary cross-sectional shapes of the carrier plate 6 according to the embodiment (FIG. 3 a), according to a first modification of the embodiment (FIG. 3 b) and according to a second modification of the embodiment (FIG. 3 c). FIGS. 3a to 3c are respectively schematic cross-sectional views looking from the free end of the respective arm 2 and 3 in the direction of the joint. In the embodiment shown in Fig. 3a, the support plate 6 over its entire extension on a flat course. However, it is also possible, for example, to have a slightly curved course with a convex second main surface 6b. In the first modification shown in Fig. 3b, the support plate 6 also has a substantially planar shape on, in which a central main surface 6c is flat and run only edge portions 6d bent down. The second modification shown in FIG. 3c differs from the first modification in that the edge regions 6d are formed more pronounced bent over. Also in the first and second modifications, the central main surface 6c may have a slightly curved shape with a convex second major surface 6c. A perfectly flat design of the carrier plate 6, as shown in Fig. 3a, may be advantageous depending on the chosen coating method. On the other hand, a non-planar cross-section, as provided for example in the modifications of FIGS. 3b and 3c, cause a mechanical stabilization of the hair styling hot plate and counteract a deformation of the hair styling hot plate during warming.

On the first main surface 6a of the support plate 6, an electrically insulating insulation coating 7 is applied. The insulation coating 7 may e.g. be applied directly on the support plate 7 as a coating. However, it is e.g. also possible that one or more intermediate layers (for example as adhesion promoter) are provided between the carrier plate 6 and the insulating coating 7. The insulation coating 7 may e.g. be formed by a screen-printable dielectric, which is applied by screen printing as a layer, by an electrically insulating enamel or by thermally sprayed or vapor-deposited ceramic. In principle, organic or Si-containing materials are also suitable for the insulation coating. The layer thickness of the insulation coating 7 is chosen such that a sufficient degree of high-voltage resistance is given. It is also possible to provide a plurality of electrically insulating insulation coatings with the same or different material composition.

On the side remote from the support plate 6 side of the electrically insulating insulation coating 7 is also provided as a coating applied electric surface heating. It is again possible that one or more intermediate layers (eg as adhesion promoter) are provided between the insulation coating 7 and the electric surface heating. The electric surface heating has at least one layer of an electrically conductive material 8, which is structured in the direction parallel to the plane of the support plate 6 such that at least one electrical heating element 9 is formed. But it can also be a A plurality of electric heating elements 9 may be formed. The electric heating element 9 is (or the electric heating elements 9 are) formed by the material of the layer of electrically conductive material 8. The layer 8 is chosen in terms of material, layer thickness and structuring in the direction parallel to the plane of the support plate 6 such that it has such an electrical resistance that it heats when an electrical supply voltage and thus provides heating power as ohmic heat.

In the embodiment, a second electrically insulating insulation coating 10 is applied to a surface facing away from the support plate 6 surface of the electric surface heating. The second electrically insulating insulation coating 10 may be e.g. be formed from the materials that have already been described with regard to the first insulating coating 7. In particular, the second insulation coating 10 may be formed of the same material as the first insulation coating 7. The electric surface heating has at least one electrically contacted flat conductor track, which forms an electrical heating element 9. However, it can also be provided a plurality of spatially separated conductor tracks. The electric

Surface heating furthermore has a plurality of electrically conductive contact surfaces 11 for electrical contacting of the at least one planar conductor track. The

Contact surfaces 1 1 are also applied as a coating. In Fig. 2 are the

Contact surfaces 1 1 not shown, but they are in a plane between the first insulation coating 7 and the second insulation coating 10 and are each electrically connected to at least one electric heating element 9. The electrically conductive contact surfaces are connected to an electrical power supply (not shown). It is also a (not shown)

Activation circuit provided via which the supply voltage of the electric heating elements 9 can be predetermined. The electrically conductive contact surfaces 11 have a large-area contact with respective electrical heating elements 9. In the following, three exemplary embodiments will be described with reference to FIGS. 4 to 6

Design options of electric surface heating described. In Fig. 4 is a schematic view of the hair-styling hot plate 4 is shown from below, wherein the second insulating coating 10 is omitted for explanation. In the embodiment illustrated in FIG. 4, three electrical heating elements 9 are applied to the insulation coating 7. The electrical heating elements 9 each have a substantially rectangular shape in a plane parallel to the plane of the carrier plate 6 and are formed as sheet-like conductor tracks of the material of the layer of the electrically conductive material 8. The three electrical heating elements 9 are contacted in the illustrated example over a total of four contact surfaces 11, wherein a contact surface 11 (top in Fig. 4) contacted all three electric heating elements 9 each at a first end. The respective opposite second ends of the electric heating elements 9 (bottom in Fig. 4) are contacted separately via respective contact surfaces 1 1. In this embodiment can be connected to the electric heating elements 9 via the

associated contact surfaces 1 1 each separately different electrical

Supply voltages are applied so that the temperature of each

Heating elements 9 can be controlled separately. In this way, a desired temperature profile of the hair styling hot plate 4 can be adjusted. Although three electrical heating elements 9 are shown in FIG. 4, more or fewer electric heating elements 9 may also be provided. Furthermore, both sides of the electric heating elements 9 can also be contacted in common via contact surfaces 11, but in this case a desired temperature distribution can only be achieved during the

Manufacturing process (e.g., of different sizes, layer thicknesses,

Shapes, etc.) of the electric heating elements 9 are set. It is also possible to contact both sides of the electric heating elements 9 separately via associated contact surfaces 11. Although rectangular electrical heating elements 9 are shown by way of example in FIG. 4, other shapes are also possible; in particular, individual heating elements 9 of a plurality of heating elements may also be used

have different shapes. About the shape of the individual heating elements 9 and their layer thickness (or over the layer thickness profile at non-constant

Layer thickness), a desired temperature profile or Heizleistungsprofil the hair styling hot plate 4 can be adjusted.

In Fig. 5 is a schematic view of the hair styling hot plate 4 from below in a first modification is shown, wherein the second insulation coating 10 for

Explanation is again omitted. The first variation is different from the first in the embodiment of the layer of the electrically conductive material 8 and the electrical contact surfaces 11. In the first modification shown in Fig. 5, an electric heating element 9 is provided in the form of a meander-shaped planar conductor track. The respective ends of the

electric heating element 9 are again contacted via contact surfaces 11. Although a substantially uniform meandering shape is shown in FIG. 5, so too

Modifications of this form possible. For example, can be in an area where more

Heating power is desired, tighter loops are given and in a range in which a lower heating power is desired, the loops may have a greater distance from each other. It is e.g. also possible to vary the width of the conductor track and / or the layer thickness over the course of the desired

Achieve heating profile. Although only a single electrical heating element 9 is provided in FIG. 5, it is also possible here to provide a plurality of separate electrical heating elements 9. Fig. 6 shows a second modification of the hair styling hot plate 4. The second

Modification differs from the first modification described above in the form of the electric heating element 9. Instead of the uniform meander shape, the electrical heating element 9 in the second embodiment has a varying width of the conductor track over its course. In the second modification, too, the variation possibilities are given, which have already been described with respect to the embodiment and with regard to the first modification.

Fig. 7 shows a third modification of the hair styling hot plate 4. The third modification differs from the first modification described above in that instead of a single electric heating element 9, a plurality of electrical

Heating elements 9 is provided with respective associated contact surfaces 11. The electrical heating elements 9 can in particular be independently controllable. Also in the third modification are those described above

Variations given.

Although the contact surfaces 1 1 have been described with reference to FIGS. 4 to 7 merely for providing the electrical contacting of the electric heating elements 9, it is also possible, for example, the layer from which the contact surfaces 11 are formed to use to adjust the temperature distribution of the hair styling hot plate 4 targeted. For example, some points of the trace of an electric heating element 9 can be selectively bypassed or short-circuited or it can be targeted electrical

Heating elements 9 are connected to each other. In the following is still the embodiment of the opposite second

Main surface 6b of the support plate 6 described with reference to FIG. 2. The second main surface 6b of the support plate 6 is formed as a utility surface formed for contact with hair to be formed. The utility surface is formed as a coating 12 formed on the support plate 6. The coating 12 is applied on the second main surface 6b. Although the coating 12 in the

Embodiment is arranged directly on the second main surface 6b, it is also possible to provide one or more adhesive layers between the support plate 6 and the coating 12. The user surface may e.g. by a

Enamel layer, be formed by a paint, by a thermally sprayed layer, by a vapor-deposited layer, etc. The coating 12 on the one hand provides the desired surface for contact with the hair to be formed (in the embodiment: to be smoothed) and on the other hand provides protection of the support plate 6 e.g. towards hair care products and other environmental influences. As material for the

In particular, the coating 12 can again use the materials which have already been described with reference to the first insulation coating 7.

In particular, the coating 12 may optionally be formed from the same material as the first insulation coating 7.

The materials used in the production of the hair styling hot plate 4 are coordinated so that mechanical stresses in the materials and at the interfaces between the individual layers are kept as low as possible even under thermal stress (eg when heating and cooling the hair styling plate 4) , In particular, the chemical compatibility of the individual materials is coordinated and these preferably have thermal

Expansion coefficients on which do not vary much.

Although various designs have been described in relation to electric surface heating, other modifications are possible. They are different Combinations of, for example, large-area conductor tracks and winding comparatively narrow conductor tracks possible. The conductor tracks can be arranged symmetrically or asymmetrically, ordered or disordered. It is also possible, for example, to provide branched conductor tracks. Although only one hair straightener has been described as a heatable hair styling device with respect to the embodiment, the hair styling hot plate 4 can also be applied to other heatable hair styling devices, especially curlers or so-called multi styling devices. Although a heatable hair styling device 1 has been described in the embodiment, which has two hair styling hot plates 4, also an implementation is possible in which only one hot plate is provided, or even a realization in which a larger plurality of hot plates is provided. For example, in the case of a hair straightener or, for example, a curling iron, it is also possible to provide only one of two arms between which hair is enclosed for molding with a hair styling hot plate 4.

There has been described a heatable hair styling device and hair styling hotplates having a low volume, low thermal mass construction. The electric surface heating is thermally coupled very well to the user surface. In this way, a very fast heating of the hair styling hot plates can be done and at a heat dissipation also takes place very quickly reheating. Furthermore, a very cost-effective production can be carried out with low material costs.

Claims

Hair styling hotplate (4) comprising:

a support plate (6) having a first major surface (6a) and a second major surface (6a)

Main surface (6b),

at least one on the first main surface (6a) applied electrically insulating insulation coating (7) and

a on the side facing away from the support plate (6) side of the at least one electrically insulating insulation coating (7), applied as a coating electric surface heating (8, 9, 11).

Hair-styling hot-plate according to claim 1, characterized in that on the second main surface (6b) of the support plate (6) is formed a trained for the contact with hair to be formed surface of use.

Hair-styling hotplate according to claim 2, characterized in that the use surface is formed as a on the support plate (6) formed coating (12).

Hair-styling hot-plate according to one of the preceding claims, characterized in that the electric surface heating (8, 9, 1 1) has at least one layer of an electrically conductive material (8).

Hair-styling hot-plate according to one of the preceding claims, characterized in that the electric surface heating (8, 9, 1 1) has at least one electrically contacted flat conductor track as an electrical heating element (9).

Hair-styling hotplate according to claim 5, characterized in that a plurality of electrically conductive contact surfaces (1 1) for electrical

Contacting the at least one planar conductor track is applied as a coating.

7. hair styling hot plate according to one of the preceding claims, characterized in that on a side facing away from the support plate (6) surface of the electric surface heating (8, 9, 11) a second electrically insulating insulation coating (10) is applied.

8. hair styling hot plate according to one of the preceding claims, characterized in that the carrier plate (6) has an at least substantially flat plate shape.

9. hair styling hot plate according to one of the preceding claims, characterized in that the electric surface heating (8, 9, 1 1) has a plurality of spatially separated, electrically contacted conductor tracks as electrical heating elements (9).

10. hair styling device (1) comprising at least one hair styling hot plate (4) according to any one of the preceding claims, wherein the hair styling device so

is formed so that hair to be formed can be guided by applying pressure in the direction of the hair straightener heating plate (6) along the second main surface (6b).