EP1732356B1 - Heatable changing mat - Google Patents

Abstract

Changing mat (100) comprises a cushioned layer (102) and an electrically insulated heating device (108) for heating the mat. Preferred Features: The heating device is partially contained in the cushioned layer and is formed by a resistance wire, a heating element or heating foil. The mat comprises a cushion filled with a heat conducting fluid.

Description

The present invention relates to a changing mat for toddlers, in particular usable as a changing table support, wherein the changing mat has at least one padding layer and an enclosure at least partially surrounding the padding layer. The present invention also relates to a method for producing an electrically heatable changing mat.

The care of infants and especially the wrapping usually takes place on hard documents such as changing tables or changing tables. It is known on these hard underground changing table supports, hereinafter generally referred to as changing mat, hang up, which are generally made of a coated cushion layer, so that the toddler is not directly on the hard material, but on a padded surface.

Such a changing pad is for example from the EP 1 486 326A1 known.

In these conventional changing documents, however, there is the problem that they usually form a very cold ground, especially since they are usually covered with a plastic layer, which is used for hygiene reasons and for the liquid-tight completion of the upholstery. Furthermore, such changing pads are often used in environments in which the air is comparatively cool, such as in the guest toilets public facilities or on the road in the car.

Furthermore, it is known to heat the ambient air in the area of a winding station with the aid of electric radiant heaters. However, this type of heating has the disadvantage that on the one hand comparatively much energy has to be expended, and on the other hand that the time until sufficient heating has taken place is relatively long. Moreover, this is a method unsuitable for mobile applications.

From the German Utility Model DE 82 02 711 U1 is a changing mat for babies known, which is provided with a heating mat. In this case, this heating mat is formed either by an electric surface heating element or a channel system with water filling. A thermostat body provides in this known arrangement for the required limitation of the achievable surface temperature. However, such a limitation of the heat to be dispensed by means of a thermostat monitoring has the disadvantage that on the one hand, the heater is unnecessarily expensive and complex, and that on the other hand in the case of failure of this thermostat circuit may cause excessive heating.

Therefore, the object underlying the present invention, is to provide a changing mat, which increases the comfort of baby care in a particularly simple and safe way while using the supplied electrical energy as efficiently as possible.

This object is solved by the subject matters of claims 1 and 8. Advantageous developments of the present invention are the subject of the dependent claims.

The present invention is based on the idea that a direct supply of heat by electrically heating the changing mat prevents the infant from cooling down and increases the comfort of the winding process, in particular in a cool environment. Furthermore, the electric heating of the changing mat allows a particularly rapid heating of the immediate vicinity of the changing room and it is therefore the desired comfort already achieved in a very short time and with relatively little energy. In order to prevent overheating of the winding station in any case without expensive security measures, according to the invention, a heat-generating heating element of the heater is designed so that the deliverable amount of heat can not exceed a predetermined limit. By such a self-secured heater can be completely dispensed with thermostats or other temperature monitoring units and both the susceptibility and the manufacturing costs are significantly reduced.

According to an advantageous embodiment of the present invention, a heat-generating heating element of the heating device according to the invention by a Widerstandsheizleiter, z. B a Widerstandsheizdraht, formed whose material, length and / or diameter are adapted to the limit for the maximum heat releasable. With such intrinsic safety, an electrically heatable changing mat can be created in the simplest way, which makes it possible for a maximum system temperature not to be exceeded even without further control elements, such as thermostats. Another positive aspect of this solution is that the system requires low electrical power.

On the one hand to design a heater so that it can be delivered as a prefabricated part, and on the other to achieve a liquid-protected cover of the heating element, the Widerstandsheizleiter can be embedded between a support layer and a cover layer. This carrier and cover layer may be a layer of plastic or fabric. The heating wire can then be fixed for example by means of an adhesive layer.

In order to achieve the required size ranges for the area to be heated, according to an advantageous embodiment, the resistance heating wire may be provided in the form of at least one meander loop.

By positioning the heater immediately below the upper cladding layer, a reproducible maximum heat output can be determined because the heat transfer is not hindered by foam inner layers.

For reasons of voltage safety, the heating device can be provided with a power supply device which can be connected to the mains voltage, converts it into a defined low voltage and is designed so that it does not exceed a predetermined maximum output power to the heating element outputs. These are typically 20 watts in the inventive arrangement. To prevent higher power power supply devices from being connected, a "non-typical" connector may be provided between the heating element and the power supply device. "Untypical" could mean, for example, a combination of a flat pin and a circular pin. According to the invention is to be made more difficult, that a wrong power supply is connected with too high an output.

According to an advantageous embodiment, the heating device is at least partially received in the padding layer. This can ensure that the heater is protected against damage from the outside and on the other hand is not disturbing mechanically noticeable for lying on the changing mat toddler. There is both the possibility to bring the heating in the middle, so that the changing mat can also be turned because it is symmetrical. On the other hand, the heating may be arranged offset in the direction of one side, so that the padding layer is thicker on one side towards the outside than on the other, and thus a time shift of the heating is possible. Advantageously, thus one side can be heated more strongly and thereby a more suitable for colder conditions side can be realized.

However, in order to be able to manage with as little heating power as possible, the cushion layer should be as thin as possible on the side facing the toddler, or possibly only consist of the cladding layer, so that the cladding is in direct contact with the heating device.

Furthermore, the changing mat can have side and head parts, in the padding also heating elements can be arranged.

In the simplest case, the heater is realized via a heating cable with a resistance wire. In this case, commercially available strands can be used with defined resistance, which are silicone coated in the rule. This embodiment also has the advantage that the shape of the heater can be adapted individually to the shape of the changing mat and especially in the case that specifically the edge areas are to be warmed, separately heating cable can be drawn into this.

As a particularly cost-effective variant, a bare heating wire can be used. In this case, a thin resistance wire is applied to a substrate by, for example, glued to a film or sewn into a nonwoven. As is known in the context of carbon fiber mats, rail-like metallizations or likewise resistance wires for simple electrical contacting are provided on the edge of the carrier material. In an advantageous embodiment, the sewing can be done on a nonwoven fabric using two materials: The upper thread forms a conventional, electrically non-conductive textile thread, while the lower thread is formed by the resistance wire. This solution offers above all the advantage of a simplified processing and lower mechanical stress of the resistance wire.

However, the heating device can also have at least one heating element with a positive temperature coefficient, a so-called PTC element. Such PTC resistors have the advantage that at low temperatures, a high initial power can be fed and with increasing temperature a self-regulating performance occurs. Such a PTC resistor includes, for example, a PTC ceramic made of doped polycrystalline ceramics based on barium titanate in the sintering process. In the range of a pre-dimensioned reference temperature for the respective module, the so-called control temperature, the resistance value of the PTC resistor changes from a low to a high-impedance behavior and thereby jumps by several orders of magnitude. Therefore, with an appropriate choice of the reference temperature overheating of the changing mat can be prevented in a simple manner.

According to an alternative advantageous embodiment, the heating device has a heating foil of at least one resistance heating conductor track enveloped by a foil-shaped insulating layer on. This insulating film can be produced in the form of laminated plastic films and is particularly flexible and thin to produce. The heating tapes can strip from a metallization, such as copper, or be applied in the form of a silver paste by screen printing. Another advantage of the heating film-based solution is that the laminated films are impermeable to the ingress of liquid and thus the required safety regulations can be kept particularly easy.

Furthermore, the heater may also comprise a carbon fiber mat. This type of heating, which is used, for example, for car seat heaters, uses as a heating device a carrier tape, usually a textile tape, in or on the carbon fiber threads are mounted transversely to the main direction. At the lateral edges of the band, for example, copper bands are sewn, which allow electrical contact. Thus, the individual carbon fiber threads are connected in parallel to each other. The carbon fiber itself is adapted in its design individually to the requirements of the respective heating.

The changing mat can furthermore have a pad filled with a good heat-conducting fluid to increase the thermal conductivity and to better distribute the heating energy. For example, similar to a waterbed mattress, a water-filled cushion can be provided, which can be heated by means of an electric continuous flow heater. This solution has the advantage that the changing mat is particularly soft and flexible and a uniform heating can be achieved. Electrosmog in the environment of the toddler can be avoided in this way. In order to make the soaking particularly effective, a water pump may be provided for circulating the water filling.

According to a further advantageous embodiment, a gel is provided as the heat-conducting fluid. The advantage of this type of heating is on the one hand the high flexibility of the pillow, on the other hand the particularly good heat distribution.

Furthermore, it is possible to provide as gel a latent heat storage agent which can be crystallized in the heated state so that heat is released via a change in the state of aggregation of the latent heat storage medium. The heater may be configured to operate to heat and melt the crystallized latent heat storage agent. Such an embodiment has the advantage that the delivery of heat and the supply of electrical energy can be separated from each other in time, so that the changing pad can be carried for example in a mobile use in the ready state and can be heated if necessary by pressing a trigger element. An example of such a latent heat storage arrangement is in US 5,805,766 explained. The advantage of such a latent heat storage medium heating is also the extremely rapid release of the exothermic energy.

Another possible embodiment is based on the electrical heating of the changing mat by means of heated air. In this case, ambient air is sucked in via a fan and heated by means of an electric heater, such as a PTC heater or a wire heater. The warm air is conducted at defined temperature through corresponding channels in the changing mat. Such an arrangement is especially in applications in which a corresponding warm air heating is already available and can be used, such as in a motor vehicle, an advantage. Also in this embodiment, a targeted heating of the edge regions is possible.

According to a further advantageous embodiment, the changing mat is designed so that it can be used in a motor vehicle, as for example in the EP 0 978 243 B1 is shown and the electric heater is designed so that it can be fed directly from the power supply of the motor vehicle.

To prevent dangerous overheating, a temperature monitor may be provided to monitor the temperature. This can be for example a thermostat.

A controller for controlling the heating device can be provided in order to be able to adapt the heating power individually to the ambient conditions. This control can either be integrated directly on the changing mat or in the supply cable.

A time control unit for limiting the duration of heating takes account of a need for additional security monitoring.

According to an advantageous embodiment, the changing pad according to the invention with low voltage, d. H. operated with a voltage between 12 V and 48 V, on the one hand to avoid electrosmog in the immediate environment of the infant and on the other hand to exclude possible safety risks. In this case, a voltage conversion, z. B. by means of a plug-in power supply, provided for operating the heater. Basically, however, an electric heating by means of mains voltage (220 V - 240 V) can be used. In the case of application in a motor vehicle, if a supply of 230 V AC voltage is normally provided, a second heating circuit may be arranged in the changing mat in order to enable operation in a motor vehicle.

In order to avoid the occurrence of electrosmog even when using mains voltage for feeding the electric heater, can be achieved for example by a bifilar array of heating wires or Heizleiterbahnen that pick up the harmful fields.

In addition to the inventive intrinsic safety of the heating element and a hedge by a temperature monitoring device, such. As a thermostat, but also in addition or alternatively a current fuse can be integrated.

Fig. 1

eine perspektivische, teilweise geschnittene Schemazeichnung der erfindungsgemäßen Wickelunterlage;

Fig. 2

einen Schnitt durch die Wickelunterlage der Fig. 1;

Fig. 3

eine Schnittdarstellung einer weiteren vorteilhaften Ausführungsform der Wickelunterlage;

Fig. 4

eine perspektivische Schemazeichnung einer vorteilhaften Ausführungsform;

Fig. 5

eine Draufsicht auf eine Wickelunterlage, welche die Heizvorrichtung aus Fig. 4 verwendet.;

Fig. 6

einen schematischen Schnitt durch die Heizvorrichtung der Fig. 4;

Fig. 7

einen schematischen Schnitt durch die Wickelunterlage der Fig. 5;

Fig. 8

eine Seitenansicht einer elektrischen Verbindungsleitung zwischen der Heizvorrichtung und einer Leistungsversorgungseinheit;

Fig. 9

eine Draufsicht auf das Steckergesicht des Steckverbinders aus Fig. 8;

Fig. 10

eine um 90° gedrehte Darstellung der elektrischen Leitung aus Fig. 8;

Fig. 11

eine Seitenansicht einer Leistungsversorgungseinrichtung;

Fig. 12

eine um 90° gedrehte Seitenansicht der Leistungsversorgungseinrichtung aus Fig. 11;

Fig. 13

eine vereinfachte Schaltungsdarstellung der Leistungsversorgungseinrichtung aus Fig. 11 und 12.

With reference to the Ausgestsitungen shown in the accompanying drawings, the invention will be explained in more detail below. Similar or corresponding details are provided in the figures with the same reference numerals. Show it:

Fig. 1

a perspective, partially sectioned schematic drawing of the changing mat according to the invention;

Fig. 2

a section through the changing mat of Fig. 1;

Fig. 3

a sectional view of another advantageous embodiment of the changing mat;

Fig. 4

a perspective schematic diagram of an advantageous embodiment;

Fig. 5

a plan view of a changing mat, which uses the heating device of FIG.

Fig. 6

a schematic section through the heating device of Fig. 4;

Fig. 7

a schematic section through the changing pad of Fig. 5;

Fig. 8

a side view of an electrical connection line between the heating device and a power supply unit;

Fig. 9

a plan view of the plug face of the connector of FIG. 8;

Fig. 10

a 90 ° rotated representation of the electrical line of Fig. 8;

Fig. 11

a side view of a power supply device;

Fig. 12

a 90 ° rotated side view of the power supply device of FIG. 11;

Fig. 13

a simplified circuit diagram of the power supply device of FIGS. 11 and 12th

The structure and mode of operation of the heatable changing mat according to the invention will be explained in detail below with reference to the figures.

1 shows a schematic perspective view of a possible embodiment of the changing mat 100 according to the invention. The changing mat 100 comprises on the one hand, as is known, a padding 102 which is surrounded by a generally watertight wrapping 104. The edge regions 106 are designed to be increased in order to prevent a rolling down of the toddler.

According to the invention, the changing pad 100 is heated by means of an electric heating device 108. According to the embodiment shown here, the heating device 108 in the form of a mat is inserted into the padding in the middle region of the changing mat 100. An electrical lead 110 connects the heater 108 to a power supply, such as a low voltage (12V-48V). In the embodiment shown, both the enclosure 104 is made watertight and a sealed passage 112 is provided for the supply cable 110.

This fully watertight design can prevent short circuits due to moisture penetration.

As shown in FIG. 2, in one possible embodiment, the heater 108 is not received exactly centered in the padding 102, but the thickness of the padding layer between the area where the infant comes to rest and the heater 108 is tuned to the required heating powers , In case that the changing mat is symmetrical, it can be used from both sides.

The heater 108 shown only schematically here can be realized by a variety of electrical heating elements. In the simplest case, the heating is done by heating cables, commercial strands with a defined resistance, which are usually silicone coated, are used. However, it is also possible to use a bare resistance wire, which is applied to a carrier material, for example, by being glued to a foil or sewn into a fleece. As is known in the context of carbon fiber mats, rail-like metallizations or likewise resistance wires for simple electrical contacting are provided on the edge of the carrier material. In an advantageous embodiment, the sewing can be done on a nonwoven fabric using two materials: The upper thread forms a conventional, electrically non-conductive textile thread, while the lower thread is formed by the resistance wire. This solution offers above all the advantage of a simplified processing and lower mechanical stress of the resistance wire.

Alternatively, it can also be heated by PTC elements, which are applied accordingly to a network. Such a solution is for example in the US 4,937,435 shown.

The use of a heating foil, which consists of a laminate of two plastic films, between which suitable heating bands are introduced, has the advantage of ease of manufacture and a great deal of flexibility. The heating tapes can, as is generally known, either be made of a metallization, preferably of copper, or else be applied by means of screen printing in the form of a silver paste.

Furthermore, the heating device 108 may also be formed by a carbon fiber mat, as used in car seat heaters. In particular in connection with the use of the changing mat according to the invention in a motor vehicle this embodiment has the advantage that the heating can take place without problems directly via the power supply of the motor vehicle. Such carbon fiber mats use a carrier tape, usually a textile tape, in which carbon fiber threads are sewn transverse to the main direction and contact the carbon fiber threads, for example, with copper bands, which are sewn on the edges of the band left and right. The individual carbon fibers are then connected in parallel to each other electrically.

A further embodiment of the changing mat according to the invention is shown in FIG. In this case, the changing mat 100 comprises, in addition to the electric heating device 108, a pad 114 which is filled with a good heat-conducting fluid 116. In this case, the fluid 116 may be water, for example, so that the changing mat has a kind of waterbed mattress. In the embodiment shown in Fig. 3, the electric heater 108 takes over the heating of the water cushion 114. Alternatively, it can also be provided that an inlet and outlet allow replacement of the water 114 and provided in a separate heating arrangement, an electric water heater and a water pump are.

Alternatively, however, the fluid 116 may also be formed by a gel, and in particular by a latent heat storage agent, which may be caused by a trigger element to change its state of matter and give off heat in this exothermic reaction. The electric heater 108 allows the back transformation to the molten state when electrical energy is available, while the heat release can be delayed in places and at times when no electrical energy can be supplied.

As already mentioned, the heating of the changing mat can also take place by means of heated air. In this case, ambient air is sucked in via a fan and heated by means of an electric heater, such as a PTC heater or a wire heater. The warm air passes through with a defined temperature corresponding channels passed in the changing mat. Such an arrangement is especially in applications in which a corresponding warm air heating is already available and can be used, such as in a motor vehicle, an advantage. Also in this embodiment, a targeted heating of the edge regions is possible.

4, an advantageous embodiment of a designed as a heating mat heater 108 is shown in a perspective form. This heating mat, which can also be referred to as a heating insert or heating insert, has, as is apparent from the synopsis with the sectional view of FIG. 6, as the base a one-sided provided with a layer of hot melt adhesive support layer 122, which is formed for example by a fabric and in their dimensions approximately equal to the length of the area to be heated of the changing mat 100 corresponds (see Fig. 5). In width, the fabric web on both sides is about 50 to 100 mm wider than the area to be heated, which is designated in Fig. 5 with 101. This larger width later allows the positioning and fixing of the heating pad 108 in the changing mat 100 by sewing or sewing.

The preparation of the heating pad 108 is effected in that the carrier layer 122 is applied in a mounting device which pierces the fabric at defined locations by means of fine rods, similar to needles. The positions of the needles thereby define inflection points in the course of the heating conductor 120 to be applied later. In this way, the heating conductor can be designed to be defined on the carrier layer as in the meandering shape shown. In this case, the heating conductor 120 as a single continuous wire, d. H. designed in the form of a series connection. A parallel connection is of course also possible, but this is due to the necessary electrical connections that lead to a kind of ladder structure, consuming.

As the material for the resistance heating wire 120, any heating conductor alloy can be used. It is also possible to use a CuNi wire or an aluminum wire. Basically it must also on the media resistance, z. As compared to water and urea, be respected.

According to the invention, the material, the length and the diameter of the heating wire 120 are adjusted so that the heat to be emitted does not exceed the maximum permissible range of about 37 to 39 ° C, which are still perceived as pleasant.

The diameter of the heating wire can be, for example, 0.5 mm and is thus not noticeable on the surface. Other wire forms, z. B. flat wire, are possible. At the ends 130, 132 of the heat conductor 120, a power supply is attached. This consists of two strands 134, which are brought together to form a feed line 110. The connection between the strands 134 and the ends 130, 132 of the heat conductor 120 can be done for example by a crimp connection, but also by soldering or welding. The supply line 110 may also be provided, if appropriate, with a strain relief 136, which is fixed in the winding support 110, as shown in Fig. 5.

As a final layer, also referred to as cover layer 124, another fabric is applied again. As a fixing step then the surface heating of the entire unit, for example by ironing. As a result, the adhesive melts on the two fabric webs and fixes the heating wire and the connection point to the supply line 110. If the cover 104 of the changing mat 100 is used directly as the support layer 122, one of the layers 122, 124 can be dispensed with.

Of course, plastic materials can also be used instead of a fabric.

As shown in Fig. 5 and the associated sectional view of Fig. 7, the changing mat 100 consists of a base layer, which is part of the envelope 104, and is formed by a layer of plastic or textile material, a cushion layer 102, for. As foam, and the heating pad 108, which is formed by the recorded in the carrier and cover layer heating wire. The heating pad 108 may be a loose part on the upper layer of the wrapper 104 facing the infant is to be fastened by means of sewing or gluing. As already mentioned, however, the carrier layer 122 may be identical to this side of the sheath 104 facing the infant. In principle, the envelope 104 can be formed either by a plastic layer or a textile material. It is also often required that the entire changing mat be machine washable and possibly dry in a dryer.

Especially in this context, the waiver of any type of thermostat or sensor according to the invention has the advantage that only on a liquid-tight or media-resistant design of the very simple heating element 120 must be respected and otherwise all components such requirements quite sufficient.

With reference to FIGS. 8 to 13, the power supply of the resistance heating wire 120 will be explained in more detail below. 8 to 10 show a feed line 110 which can be connected to the ends 130, 132 of the heating wire on the one hand and to the power supply unit shown in FIGS. 11 to 13 on the other hand.

For safety reasons, the heating device 108 for the changing mat 100 is carried out with low voltage. Therefore, the electrical supply of the heater from a power supply 126 and a supply line 110th

The power supply 126 may be, for example, a so-called plug-in power supply, which is plugged directly into the socket. Such plug-in power supply units are particularly suitable for transforming the mains voltage from 230 VAC into 12 VAC with low output power. In order to ensure that no higher power is ever output to the heater wire 120 than is allowed for the allowable maximum temperature, the power supply unit 126 may have an output power limitation of, for example, 22 watts. On the supply side, the plug-in power supply shown in FIGS. 11 and 12 is connected to the mains voltage via a primary-side plug designed here as a European plug. For the expert Of course, it is clear that all other primary-side plug arrangements can also be used, for example, according to US or Japanese country standards.

The connection to the feed line 110 takes place via a plug connector 128. In this case, this plug connector 128 is designed as a somewhat untypical plug shape, here as a combination of a flat plug 140 and a round plug 142. The advantage of such a design is that it is made more difficult to an incompatible power supply, d. H. to connect one with too high power.

It is also possible to connect the supply line 110 inextricably with the power supply 126 without a plug connection.

The two-core supply line 110 is on the one hand in plug-in contact with the power supply 126, and the connection to the two ends of the heating wire 130, 132 takes place, as already described, by crimping, soldering or welding. Alternatively, however, a detachable connection could also be provided here, since this would have particular advantages in the possibly necessary washability of the entire changing mat.

As shown in FIGS. 8 and 10, a switch with an indication of the operating state, for example by means of a light or a printed marking, can be provided on the supply line 110.

In the plug-in power supply 126 may also, as indicated in Fig. 13, a T-fuse 125 may be provided to secure the power supply in case of failure. In this way, z. B. in the case of a short circuit due to mechanical damage, the heater 120 are safely disconnected from the mains.

With the construction according to the invention, it is possible not to exceed a maximum system temperature without further control elements such as thermostats. This maximum temperature is about 37 to 39 ° C for a changing mat, which, as they is close to the body temperature, is perceived as pleasant. According to the invention, this limitation is due to the design of the heating wire, which depends on factors such as the material and thus the electrical properties, the length and the diameter takes place. Such a design is facilitated by the positioning of the heater immediately under the coat layer facing the toddler, since the heat transfer does not have to take place through a foam inner layer.

A positive side effect of the solution according to the invention is that the system operates extremely energy-efficient, since typically only about 20 watts are needed to reach the desired temperature.

Another intrinsic safety effect is the system's response to the child's placement. Due to the weight, the foam layer is compressed and the foam material is compressed in this way. The fact that the air, which normally has an insulating effect, is pushed out of the material reduces the typical insulation function of the foam material and results in an increased heat emission downwards, as a result of which heat is drawn off from above. Overheating is thus avoided.

As already mentioned, the changing mat according to the invention can be designed to be insensitive to water in a particularly simple manner and in this way is even machine-washable or suitable for driers.

Although in the foregoing always a changing pad has been described, it is obvious to the skilled person that the pad according to the invention can also be used for other applications, such. B. as a seat pad in retirement homes or churches or as an animal blanket in the pet care. Furthermore, other types of heating than those described above may be used.

Claims (11)

1. Changing mat for infants which comprises at least one upholstering layer (102) and an electrically heatable heating device (108) for heating the changing mat (100),
   characterized in that a heat generating heating element (120) of the heating device is dimensioned in a way that the heat which is released during operation does not exceed a predetermined limit.
2. Changing mat according to claim 1, wherein the heating element (120) is formed by a resistance heating conductor, whose material, length and/or diameter are adapted to the limit for the maximum releasable heat.
3. Changing mat according to claim 2, wherein the resistance heating conductor (120) is accommodated between a carrier layer (122) and a top layer (124).
4. Changing mat according to claim 2 or 3, wherein the resistance heating conductor (120) forms at least one meander loop.
5. Changing mat according to at least one of the preceding claims, further comprising an envelopment (104), which surrounds the upholstering layer (102) and the heating device (108) in a way that the envelopment is at least partly in contact with the heating device (108).
6. Changing mat according to at least one of the preceding claims, wherein the heating device is connectable to a board voltage supply in a motor vehicle.
7. Changing mat according to at least one of the preceding claims, wherein the heating device comprises a power supply unit (126) which can be connected with a mains voltage and is dimensioned in a way that same does not release more than a predetermined maximum output power to the heating element (120).
8. Changing mat according to claim 7, wherein the heating device (108) comprises a plug connector (218) for connection with the power supply unit (126), which is formed in a way that same is only compatible to power supply units with the predetermined maximum output power.
9. Method for fabricating an electrically heatable changing mat, said method comprising the following steps:

   fabricating an electrical heating device by applying at least one resistance heating wire onto a carrier layer and covering the resistance heating wire by means of a top layer, wherein the carrier layer and the top layer are connected to each other so that the resistance heating conductor is sealed in a liquid-tight manner towards the ambience;

   applying the heating device onto an upholstering layer;

   enveloping the heating device and the upholstering layer.
10. Method according to claim 9, wherein fabricating the heating device comprises:

    applying an adhesive layer onto the carrier layer and the top layer;

    laying the resistance heating conductor onto the adhesive layer of the carrier layer;

    covering the adhesive heating wire with the top layer, so that the adhesive layer is in contact to the resistance heating conductor;

    fixing the arrangement by means of two-dimensional heating.
11. Method accord to claim 9 or 10, wherein the carrier layer is formed by a part of the envelopment.

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