DE102019106865B4 - Process for producing a plastic part with at least one heating wire arranged in the plastic part and plastic part with a heating wire arranged therein - Google Patents

Abstract

Process for the production of a plastic part (1) from a plastic film or sheet (2) with at least one heating wire (3) arranged in the plastic part (1), which is connected via at least one heating wire (3) arranged on one side of the plastic part (1) and contact socket (4) serving as an electrical connecting element can be electrically contacted, with the at least one heating wire (3) arranged in the plastic part (1) being exposed in at least one contact area, namely insulation encasing the at least one heating wire (3) in the form of electrically insulating lacquer layer is removed before the at least one heating wire (3) is electrically contacted in the exposed contacting area with the electrical connection element in a subsequent process step, characterized in that for the production of the plastic part (1) a plastic film or plate (2) with a in the contact area of at least one heating wire (3) unperforated, closed whose surface is used, so that the plastic part (1) is characterized in the contact area of the heating wire (3) by the unperforated, closed surface of the plastic film or plate (2) that the plastic film or plate (2) in Contacting area of the at least one heating wire (3) an electrical connection means is applied, which electrical connection means is designed as an adhesive strip (7) carrying a copper layer (5) or an electrically conductive contact surface, and that for the electrical connection of the connection means and the at least one heating wire (3) the electrical connection means is either placed on the associated exposed contact area of the at least one heating wire (3) or the at least one heating wire (3) is laid over the electrical connection means with its exposed contact area.

Description

The invention relates to a method for producing a plastic part from a plastic film or plate with at least one heating wire arranged in the plastic part, which can be electrically contacted via at least one contact socket arranged on one side of the plastic part and serving as an electrical connection element, the at least one heating wire arranged in the plastic part is exposed in at least one contacting area, namely an insulation covering the at least one heating wire in the form of an insulating lacquer layer is removed before the at least one heating wire is electrically contacted in the exposed contacting area with the electrical connection element in a subsequent method step. The invention also relates to a plastic part which is produced using the method mentioned in the opening paragraph.

A radar device with a radar antenna, which is housed on the motor vehicle in a protected manner in a radome or similar plastic molded part, is increasingly being used to identify the surroundings in motor vehicles. Thin heating wires are drawn into this radome to protect the transparent radome against ice or snow. These heating wires look similar to those that are provided, for example, in the rear window of a motor vehicle. However, the heating wires integrated in the comparatively small radome are much finer and the wire used is often thinner than a hair and correspondingly sensitive. This heating wire ends in two contact points in the radome, which are then used for contacting. In the area of the contact points used for contacting, a hole is to be provided in the plastic molded part serving as a radome in order to contact the contact points of the heating wire there. The at least one heating wire is routed to these holes. In order to protect the contact with the heating wire as far as possible, these holes are arranged on the outer circumference of the plastic molded part forming the radome under an external decorative or fastening ring. Despite this protected arrangement, rainwater, dirt thrown up while driving or moisture can penetrate into the area of the holes provided in the plastic molded part and impair the heating wires and their contact with the vehicle electrical system.

From the DE 10 2008 015 852 A1 a plastic film is already known which is intended as a heatable plastic pane for motor vehicles and in which a printed heating conductor is embedded for this purpose. In order to produce the heatable plastic pane reliably with little effort, the previously known plastic pane has an electrical line and a contact element in addition to the printed heating conductor, the contact element being arranged between the electrical line and the printed heating conductor. This contact element of the previously known plastic disk has, among other things, a distribution function in order to distribute the current that is fed into the printed heating conductor via the electrical line over a large area of the printed heating conductor, so that local overheating of the plastic disk at the contact surface is avoided. The contact element in the previously known plastic pane is preferably designed and connected to the heating element in such a way that it only emits such amounts of heat to the plastic pane that do not permanently damage the plastic pane. For this purpose, it is provided that the contact element is made of copper or another metal with a high thermal conductivity and heat storage capacity and is designed in the form of a band or strip. In this case, the contact element can be glued onto the printed heating conductor in order to prevent the harmful effect of heat and irreparable damage to the plastic pane.

From the JP 2017-109683 A a plastic car window is already known, which consists of two plastic plates between which a line network consisting of a heating wire and an antenna line are inserted. The antenna line and the heating wire are connected to a common plug, which penetrates the inner plastic plate and can be connected to a connector and electrically contacted on the inside of the previously known plastic car window. However, the production of the previously known plastic car window from two plastic plates connected to one another, one of which has a plug passing through it, is comparatively complex.

From the DE 10 2013 207 482 A1 one already knows a comparably constructed, heatable surface element, which can be designed as a radome. The previously known heatable planar element has a planar base element and a planar cover element arranged on the base element, with a planar heating element being provided between the base element and the cover element and with a recess being provided in the base element, into which a contact element is inserted, which the planar Electrically contacted heating element. The production of this heatable surface element is also comparatively complex with its two-layer structure of base element and cover element and with the heating element located in between and which can be contacted with a contact element.

From the DE 100 18 276 A1 you already know a compound pane that can be used as a heating or antenna disc serves. The previously known laminated pane is made from a thermoplastic adhesive layer in which electrically conductive wires are embedded, which can be electrically contacted in particular via at least one connection element. In order to provide these wires with improved surface conductivity and simplified solderability, the DE 100 18 276 A1 previously known laminated pane provided that the electrically conductive wires embedded in the adhesive layer consist of at least two conductive material layers. Thus, the multi-layer wire embedded in the adhesive layer can consist of a mechanically stressable metal, preferably a chromium-nickel steel, which is connected to a more highly conductive and readily solderable metal, preferably copper.

The EP 1 899 655 B1 discloses an electrically powered surface heating system that can be used in conjunction with floor panels.

The DE 39 36 520 A1 discloses a seal for a heated mirror connector having a panel heater attached to the back of a mirror, a connector securely attached to a back side of the panel heater, and electrodes disposed on the back side of the panel heater. The connector has a connector housing that contacts the back of the heater. Terminal members are accommodated in the terminal case so as to be in contact with the electrodes. The junction box has a frame wall which, in conjunction with the rear of the heater, forms a space surrounding the terminal members. Further, a sealing agent is provided, which is filled in the space formed by the terminal case and the back of the heater. A groove is formed along the periphery of the space on the underside of the junction box which is in contact with the rear surface of the heater.

1. a) Bereitstellen eines ebenen transparenten Folienstücks mit zumindest einer Aussparung, b) zumindest partiell Einbetten zumindest eines elektrisch leitenden Drahts in das Folienstück, wobei der zumindest eine elektrisch leitende Draht derart eingebettet wird, dass sich zumindest ein Drahtabschnitt des zumindest einen elektrisch leitenden Drahts durch die zumindest eine Aussparung erstreckt, c) Formen des Folienstücks mit dem zumindest einen elektrisch leitenden Draht, d) Hinterspritzen des geformten Folienstücks, wobei die zumindest eine Aussparung nicht hinterspritzt wird, e) Anordnen zumindest eines Kontaktelements aus einem elektrisch leitfähigen Material an der zumindest einen Aussparung, wobei das zumindest eine Kontaktelement den zumindest einen Drahtabschnitt in der Aussparung direkt kontaktiert, f) Verbinden des zumindest einen Kontaktelements mit dem zumindest einen Drahtabschnitt in der Aussparung.

The pamphlet DE 10 2014 002 438 A1 discloses a manufacturing method for a heatable plastic radome of a motor vehicle, comprising the steps:

1. a) providing a flat, transparent piece of film with at least one recess, b) at least partially embedding at least one electrically conductive wire in the piece of film, the at least one electrically conductive wire being embedded in such a way that at least one wire section of the at least one electrically conductive wire extends through the extends at least one recess, c) molding the piece of film with the at least one electrically conductive wire, d) back-injection molding of the formed piece of film, wherein the at least one cut-out is not back-injected, e) arranging at least one contact element made of an electrically conductive material on the at least one cut-out , wherein the at least one contact element contacts the at least one wire section in the recess directly, f) connecting the at least one contact element to the at least one wire section in the recess.

The object is therefore to create a method of the type mentioned at the outset and a plastic part produced using the method described at the outset, which ensure improved protection of the heating wires embedded in the plastic part, particularly in the contact area between the heating wires and the rest of the vehicle electrical system, against external environmental conditions, and which are nevertheless associated with a comparatively low production cost.

The solution to this problem according to the invention consists in the method of the type mentioned in the features of the applicable patent claim 1 and in particular in that an electrical connection means is applied to the plastic film or plate in the contact area of the at least one heating wire, which electrical connection means acts as a , a copper layer or an electrically conductive contact surface is formed, and that for the electrical connection of the connection means and the at least one heating wire, the electrical connection means is either placed on the associated contact area of the at least one heating wire or the at least one heating wire is laid over the electrical connection means .

The method according to the invention is intended for the production of a plastic part from a plastic film or plate with at least one heating wire arranged in the plastic part. In order to avoid a hole in the plastic part intended for contacting the at least one heating wire, the at least one heating wire can be electrically contacted via at least one contact socket or similar electrical connecting element arranged on a flat side of the plastic part. For this purpose, the at least one heating wire arranged in the plastic part is stripped of paint or the like exposed in a contacting area before the at least one heating wire is electrically contacted in the exposed contacting area with the electrical connecting element in a subsequent process step. The method according to the invention thus provides for contacting the at least one heating wire placed on or in a plastic part and a contact socket or the same electrical connecting element, the plastic part being characterized in the contact area of the heating wire by an unperforated, closed surface of the plastic film or plate.

So that the plastic part, which may also be exposed to the weather-related environmental influences on its outside, can be heated if necessary and, for example, freed from a layer of ice or snow, at least one, preferably hair-thin, heating wire is molded into the plastic part. This at least one heating wire can be contacted with the vehicle electrical system via at least one electrical plug connection, which is arranged on a flat side of the plastic part. The plastic part according to the invention, which can also be used to heat an interior, for example, or serves as a radome for a motor vehicle, under which radome a radar antenna can be housed in a protected manner, is made from a plastic film or plate. In order to be able to design the plastic part with a closed and hole-free plastic surface, particularly in the area of the sensitive heating wires and their contact points with the vehicle electrical system, the method according to the invention provides that the at least one heating wire or at least one of the heating wires is connected to the contact socket in an exposed contact area or the like electrical connecting element is electrically connected. Since a hole for passing through the heating wires is no longer required for contacting the heating wires with the electrical connection element, the heating wires are also arranged in a protected manner at their contacting areas underneath the outer side of the plastic part.

According to the invention, an electrical connection means is applied to the plastic film or plate in the contact area of the at least one heating wire and is electrically connected to the at least one heating wire. An adhesive strip carrying an electrical copper layer or an electrically conductive contact surface serves as the electrical connection means. It is essential that the contacting area of the at least one, usually very fine, heating wire is electrically connected to an electrical connection means, which significantly increases the available contacting surface for contacting the contact socket or similar electrical connection means.

The plastic part can retain a plate-like shape of the plastic material used for it. In contrast, a preferred and versatile method step provides that the plastic part is designed as a three-dimensional plastic molded part and is made from a deformable plastic film or plate.

In order to be able to accommodate a radar antenna, for example, below the plastic part, it is advantageous if the plastic film or plate is brought into a three-dimensional shape by a thermoplastic forming process.

It is expedient here if the plastic part is punched out of the plastic film or plate formed in the thermoforming process.

In order to be able to accommodate the at least one thin and correspondingly sensitive heating wire in a protected manner in the plastic part, it is advantageous if the plastic film or plate is back-injected with plastic after the copper layer or the electrically conductive contact surface has been applied and the at least one heating wire has been placed. In this way, the at least one heating wire is guided in a protected manner in the corresponding tracks inside the plastic part.

In order to be able to connect the heating wires, which run in several paths in the plastic material of the plastic part, to the vehicle electrical system via at least one contact socket or similar electrical connecting element, it is advantageous if the copper layer or the electrically conductive contact surface and/or the at least one heating wire in the plastic part passes through Ultrasound or by laser from a flat side of the plastic part is at least partially exposed.

In this case, the method according to the invention is additionally simplified if, when exposing the copper layer or the electrically conductive contact surface, insulation encasing the at least one heating wire is also removed. This insulation can be, for example, an insulating lacquer layer around the at least one heating wire.

In order to be able to ensure reliable electrical contact between the copper layer serving as the connection means or the electrically conductive contact surface and the at least one heating wire, it is advantageous if the copper layer or the electrically conductive contact surface and the at least one heating wire are electrically connected to one another by mini-wave soldering. However, it is also possible to establish the electrical connection by "piston soldering" or by gluing with a suitable, electrically conductive adhesive.

A preferred embodiment according to the invention provides that the at least one Contact socket or the like electrical connecting element has a mounting base on which a contacting portion of the plug contact is exposed.

The plastic foil or plate and the plastic part produced from it have a corresponding thickened cross section in the area of the connection means. So that the sensitive heating wires arranged in the plastic part are not damaged, it is advantageous if the electrical contact between the copper layer or similar electrical connection means and the at least one heating wire on the one hand and the electrical contact between the plug contact or similar electrical connection element and the copper layer or similar electrical connection means on the other hand are spaced apart.

In order to be able to firmly connect the plug contact in the contact socket and the copper layer to one another electrically, it is advantageous if the plug contact and the copper layer or the like are soldered to one another and/or electrically connected in some other way through an opening in the fastening base.

In the case of the plastic part of the type mentioned at the outset, the solution according to the invention to the object set out above lies in the features of the applicable patent claim 12. The plastic part according to the invention has at least one heating wire arranged in the plastic part, which can be connected via at least one electrical plug-in connection arranged on a flat side of the plastic part or such electrical connection element is electrically contactable. For this purpose, the at least one heating wire is placed on an electrical connection means and is electrically connected to the electrical connection element via this electrical connection means.

The plastic part according to the invention provides that the plastic part has at least one adhesive strip, which has an adhesive layer on one side and a copper layer or an electrically conductive contact surface on the other side facing away from the adhesive layer, and that at least one plug contact provided in the electrical connection element has at least is electrically connected to a contact area of the at least one heating wire that is exposed in the plastic part via the electrically conductive contact surface of the adhesive strip.

In order to be able to electrically connect the at least one heating wire or at least one of the heating wires in the contacting area to the electrical connection means, the at least one heating wire can be placed with its contacting area on the electrical connection means. However, it is also possible for the electrical connection means to be applied to the contact area of the at least one heating wire or at least one of the heating wires.

In order to be able to back-inject the plastic film or plate used to produce the plastic part as soon as the at least one heating wire has been placed in several tracks on the plastic film or plate, it is advantageous if the adhesive layer is an adhesive layer that is preferably temperature-stable over 450° is. Such a temperature-stable adhesive layer can also withstand the temperatures that occur when the plastic film or plate is overmolded with another, preferably transparent, plastic material.

If an adhesive layer serving as an electrical connection means is used, it can be advantageous if the adhesive layer serving as an electrical connection means has a silver-containing two-component or multi-component epoxy adhesive.

In order to avoid holes in the plastic part in the area of the sensitive heating wire, it is advantageous if the plastic part has a closed surface at least in the partial area surrounding the at least one heating wire, at least on the flat side facing away from the at least one electrical connecting element. The plastic part can therefore definitely have holes with which the plastic part can be attached to the motor vehicle. However, so that the sensitive heating wires in the plastic part cannot easily corrode or be damaged, it is advantageous if the plastic part does not have any parts that expose the heating wire, at least in the partial area surrounding the at least one heating wire, at least on the flat side facing away from the at least one contact socket or similar electrical connection element hole.

It is particularly advantageous if the plug contact provided in the at least one contact socket or similar electrical connection element is designed as a stamped and bent part.

A preferred embodiment according to the invention provides that the at least one contact socket has a front insertion opening and a fastening base on its front side facing away from the insertion opening.

So that the plug contact can be formed as a contact lug in the insertion opening of the contact socket or the like, while its plug contact end facing away from it richly serves as connection means, or can be led to the copper layer serving as connection means, the electrically conductive adhesive layer or the like, it is advantageous if the plug contact molded into the contact socket or similar electrical connection element is designed as a stamped and bent part.

If an adhesive strip with an external copper layer or an electrically conductive adhesive layer is applied to the plastic part and the heating wires are routed over this copper or adhesive layer, it is advantageous if a partial contact area of the plug contact or similar electrical connection element is exposed on the side of the fastening base facing away from the insertion opening. so that the plug contact or the like can be electrically connected via this partial contact area to the copper or adhesive layer or the like exposed in the plastic part.

In order to be able to electrically connect the partial contact area of the plug contact or similar electrical connection element to the copper or adhesive layer or the like after the contact socket has been applied and placed on the plastic molded part, it is advantageous if the contact area for contacting with the copper layer or the electrically conductive contact surface of the adhesive strip provided contacting subarea of the contact socket serving as a connecting element is arranged in a flange-like projecting outer peripheral edge area of the mounting base, and when this outer peripheral edge area passes through an opening leading to the plug contact and in particular to its contacting subarea.

A preferred application according to the invention provides that the plastic part designed as a plastic molded part is designed as a radome that can be mounted on a motor vehicle or the like with a spherical or spherical segment-shaped curved shell to protect an antenna system from disruptive weather conditions.

• Es zeigt in zum Teil schematisch vereinfachter Darstellung:
  • 1 eine in Draufsicht rechteckige Kunststoff-Folie oder -Platte mit, auf einer ihrer Flachseiten aufgeklebten Klebestreifen, welche Klebestreifen eine als Anschlussmittel dienende Kupferschicht tragen,
  • 2 die in 1 dargestellte Kunststoff-Folie oder - Platte, auf die ein Heizdraht in mäandrierenden Bahnen aufgelegt ist, wobei die Anschlussenden dieses Heizdrahtes auf den mit einer Kupferschicht versehenen Klebestreifen aufliegen,
  • 3 den mit der Kupferschicht eines der Klebestreifen fest verbundenen Heizdraht in einer schematischen Detail-Ansicht im Bereich der Kontaktierungsstelle, wobei die elektrische Verbindung zwischen dem Klebestreifen und dem Heizdraht durch Miniwellenlöten erfolgt, ohne dass der Heizdraht vorher entlackt oder abisoliert werden muss,
  • 4 die Kunststoff-Folie oder -Platte im Bereich der auf der Kupferschicht der Klebestreifen aufliegenden Heizdrähte, wobei die Heizdrähte durch Laser- oder Ultraschall-Einwirkung entlackt und abisoliert werden, bevor die elektrische Kontaktierung mit der Kupferschicht des Klebestreifens erfolgt,
  • 5 die in einem weiteren Ausführungsbeispiel gezeigten, im Verfahrensschritt gemäß 4 vorbereiteten und auf der Kupferschicht aufliegenden Heizdrähte beim Verlöten oder Verkleben und somit beim Kontaktieren auf der Kupferschicht, wobei dazu auf die Kupferschicht und die darauf aufliegenden Heizdrähte eine elektrisch leitfähige Leitschicht, insbesondere eine Schicht aus Lötzinn, aufgetragen wird,
  • 6 die in den Verfahrensschritten gemäß 3, 4 und 5 vorbereitete und mit einem bahnenförmig eingelegten Heizdraht versehene Kunststoff-Folie oder -Platte beim Thermo-Umformen in eine dreidimensionale Raumform, in der das als Kunststoff-Formteil ausgebildete Kunststoffteil eine sphärisch gefüllte Formgebung aufweist,
  • 7 das aus der Kunststoff-Folie oder -Platte gemäß den 1 bis 6 ausgestanzte Kunststoffteil mit dem darin eingeformten und auf der Kupferschicht der Klebestreifen aufliegenden Heizdraht,
  • 8 das als Kunststoff-Formteil ausgebildete Kunststoffteil beim Überprüfen des darin eingeformten Heizdrahtes,
  • 9 eine in einem schematischen Längsschnitt dargestellte und auf dem Kunststoff-Formteil platzierte Kontaktbuchse mit einem darin eingeformten Steckkontakt, wobei der Steckkontakt an seinem, einer Kontaktfahne abgewandten Kontaktierungsteilbereich auf der Kupferschicht aufliegt, und wobei die auf dem Kunststoff-Formteil platzierte Kontaktbuchse mittels Ultraschallschweißen über einen Energierichtungsgeber verbunden wird,
  • 10 die Kontaktbuchse aus 9 während des Verlötens des Kontaktierungsteilbereichs des Steckkontakts an der Kupferschicht durch eine in einem Befestigungssockel der Kontaktbuchse vorgesehene Öffnung hindurch,
  • 11 die auf dem Kunststoff-Formteil befestigte Kontaktbuchse beim Überprüfen der elektrischen Kontaktierung ihres eingeformten Steckkontakts einerseits und der am Kunststoff-Formteil freigelegten Kupferschicht andererseits,
  • 12 mehrere, auf einem Tray bereitgestellte und verpackte Kunststoff-Formteile,
  • 13 das Kunststoff-Formteil in dem freigelegten Teilbereich des die Kupferschicht tragenden Klebestreifens und des darauf aufliegenden, zumindest einen Heizdrahtes,
  • 14 den im Kunststoffteil freigelegten Teilbereich zwischen Klebestreifen und Heizdraht,
  • 15 den in den 13 und 14 dargestellten Abschnitt des als Kunststoff-Formteil ausgebildeten Kunststoffteiles in einem Längsschnitt durch den die Kupferschicht tragenden Klebestreifen sowie dem darauf aufliegenden, zumindest einen Heizdraht,
  • 16 das in einem Teil-Längsschnitt gezeigte Kunststoff-Formteil im Bereich des die Kupferschicht tragenden Klebestreifens sowie des darauf aufliegenden, zumindest einen Heizdrahtes, wobei der zumindest eine Heizdraht mit der Kupferschicht des Klebestreifens elektrisch verbunden ist,
  • 17 den in 16 gezeigten Bereich des Kunststoff-Formteiles in einer perspektivischen Draufsicht,
  • 18 eine auf einem Kunststoff-Formteil platzierte Kontaktbuchse im Bereich ihres auf dem Kunststoff-Formteil aufsitzenden Befestigungssockels, wobei in einem flanschartig vorstehenden Außenumfangsrandbereich des Befestigungssockels der Kontaktierungsteilbereich eines in die Kontaktbuchse eingeformten Steckkontaktes platziert ist, und wobei in diesem vorstehenden Umfangsrandbereich eine zum Kontaktierungsteilbereich des Steckkontakts führende Öffnung vorgesehen ist,
  • 19 die in einem Längsschnitt dargestellte Kontaktbuchse aus 9 bis 11 und 18, wobei der Kontaktierungsteilbereich des in die Kontaktbuchse eingeformten Steckkontaktes mit der Kupferschicht des auf dem Kunststoff-Formteil befindlichen Klebestreifens elektrisch verbunden ist,
  • 20 den auf dem Kunststoff-Formteil befindlichen Klebestreifen mit dem damit bereits elektrisch verbundenen Heizdraht in einer Draufsicht,
  • 21 ein Kunststoff-Formteil, in das zumindest ein bahnenförmig verlaufender Heizdraht eingeformt ist, der an voneinander beabstandeten Drahtabschnitten auf Klebestreifen aufliegt, welche eine mit dem Heizdraht kontaktierte Kupferschicht tragen,
  • 22 ein als Kunststoff-Spritzgussteil ausgebildetes elektrisches Verbindungselement mit darin eingeformten und voneinander beabstandeten Steckkontakten, welche Steckkontakte an ihrem einen freien Ende als vorstehende Kontaktfahne ausgebildet sind, während der demgegenüber abgewandte Endbereich der Steckkontakte als freigelegter Kontaktierungsteilbereich ausgebildet ist, dessen Kontaktierungsteilbereich auf der Kupferschicht eines der Klebestreifen aufsitzt und elektrisch kontaktiert ist,
  • 23 den Klebestreifen mit dem zumindest einen, darauf aufliegenden Heizdraht, wobei die mit dem zumindest einen Heizdraht elektrisch verbundene Kupferschicht des Klebestreifens mit dem Kontaktierungsteilbereich des in das Kunststoff-Spritzgussteil eingeformten Steckkontaktes elektrisch kontaktiert ist,
  • 24 ein als elektrisches Verbindungselement dienendes und auf einem Kunststoff-Formteil platziertes Kunststoff-Spritzgussteil, in dem als Stanz-Biegeteile eingeformte Steckkontakte vorgesehen sind, die einen als Kontaktfahne ausgebildeten Endbereich und einen als Kontaktierungsteilbereich ausgebildeten gegenüberliegenden Endbereich haben, wobei über den als Kontaktierungsteilbereich ausgebildeten Endbereich der Steckkontakte zumindest ein Heizdraht elektrisch kontaktierend geführt ist,
  • 25 das Kunststoff-Formteil aus 24 in einem Detail-Längsschnitt im Bereich des mit dem Kontaktierungsteilbereich des Steckkontaktes elektrisch verbundenen Heizdrahtes,
  • 26 eine Kontaktbuchse in einem Längsschnitt, wobei ein in die Kontaktbuchse eingeformter Steckkontakt über die Kupferschicht eines Klebestreifens mit einem Heizdraht elektrisch verbunden ist,
  • 27 die auf dem Kunststoff-Formteil platzierte Kontaktbuchse aus 26 in einem Detail-Längsschnitt,
  • 28 den in 26 und 27 verwendeten Klebestreifen mit der mit dem Heizdraht verbundenen Kupferschicht,
  • 29 eine Kontaktbuchse, bei welcher der Kontaktierungsteilbereich des in die Kontaktbuchse eingeformten Steckkontaktes am Befestigungssockel dieser Kontaktbuchse seitlich vorsteht,
  • 30 die über die Kupferschicht eines Klebestreifens mit einem Heizdraht elektrisch verbundene Kontaktbuchse aus 29,
  • 31 den mit der Kontaktbuchse aus 29 und 30 verbundenen Klebestreifen und dessen Kupferschicht mit dem darauf aufliegenden Heizdraht,
  • 32 ein Kunststoffteil in dem freigelegten Teilbereich des eine isolierende Lackschicht tragenden Heizdrahtes,
  • 33 den in das Kunststoffteil gemäß 32 eingelassenen Heizdraht in einer Detailansicht im Bereich seines freigelegten Kontaktierungsbereichs,
  • 34 das Kunststoffteil aus 32 und 33 in einem Querschnitt durch den Kontaktierungsbereich des in das Kunststoffteil eingelassenen Heizdrahtes in Schnittebene A-A gemäß 32, wobei der Kontaktierungsbereich des Heizdrahtes von der isolierenden Lackschicht befreit ist,
  • 35 das Kunststoffteil aus den 32 bis 34, wobei über die Kontaktierungsbereiche des Heizdrahtes ein die Kupferschicht tragender Klebestreifen gelegt ist, und wobei die elektrische Verbindung der als Klebestreifen ausgebildeten Kupferschicht einerseits und des zugeordneten Kontaktierungsbereichs des Heizdrahtes andererseits durch eine elektrisch leitfähige Klebeschicht bewirkt ist,
  • 36 das Kunststoffteil aus den 32 bis 35 in einer Detail-Draufsicht im Bereich zwischen einem der Kontaktierungsbereiche des Heizdrahtes und dem die Kupferschicht tragenden Klebestreifen, wobei die die elektrische Verbindung bewirkende Klebeschicht über den Kontaktierungsbereich des Heizdrahtes und den Klebestreifen gelegt ist,
  • 37 das Kunststoffteil aus den 32 bis 36 einem Querschnitt durch Schnittebene A-A in 35,
  • 38 ein Kunststoffteil mit einem eingelegten Heizdraht, wobei der Heizdraht in einem Kontaktierungsbereich zum Kontaktieren mit einer Steckbuchse oder dergleichen elektrischen Verbindungselement entlackt und freigelegt ist,
  • 39 den freigelegten Kontaktierungsbereich des in das Kunststoffteil gemäß 38 eingelegten Heizdrahtes in einer Detail-Draufsicht,
  • 40 das Kunststoffteil aus den 38 und 39 in einem Detail-Querschnitt durch Schnittebene A-A in 38, wobei in diesem Detail-Querschnitt die freigelegten Kontaktierungsteilbereiche des zumindest einen, in das Kunststoffteil eingelegten Heizdrahtes gut zu erkennen sind, und
  • 41 das Kunststoffteil aus 38 bis 40 in einem Detail-Querschnitt durch eine Steckbuchse oder dergleichen elektrisches Verbindungselement, wobei diese Steckbuchse über eine elektrisch leitfähige Klebeschicht mit den Kontaktierungsteilbereichen des in das Kunststoffteil eingelassenen Steckkontaktes elektrisch verbunden ist.

Further developments according to the invention result from the claims in connection with the drawing and the following description of the figures. The invention is described in more detail below using preferred exemplary embodiments:

• It shows in a partially schematically simplified representation:
  • 1 a plastic foil or plate that is rectangular in plan view with adhesive strips glued to one of its flat sides, which adhesive strips carry a copper layer serving as a connection means,
  • 2 in the 1 Plastic foil or plate shown, on which a heating wire is placed in meandering paths, with the connection ends of this heating wire resting on the adhesive strips provided with a copper layer,
  • 3 the heating wire firmly connected to the copper layer of one of the adhesive strips in a schematic detailed view in the area of the contact point, with the electrical connection between the adhesive strip and the heating wire being made by mini-wave soldering without the heating wire having to be stripped of paint or stripped beforehand,
  • 4 the plastic film or plate in the area of the heating wires resting on the copper layer of the adhesive strip, with the heating wires being stripped of paint and insulation by laser or ultrasound action before the electrical contact is made with the copper layer of the adhesive strip,
  • 5 those shown in a further exemplary embodiment, in the method step according to 4 prepared heating wires lying on the copper layer during soldering or gluing and thus during contacting on the copper layer, with an electrically conductive conductive layer, in particular a layer of solder, being applied to the copper layer and the heating wires lying on it,
  • 6 those in the process steps according to 3 , 4 and 5 Prepared plastic foil or plate with a heating wire inserted in the form of a web during thermoforming into a three-dimensional shape in which the plastic part designed as a plastic molded part has a spherically filled shape,
  • 7 from the plastic film or plate according to the 1 until 6 Punched plastic part with the heating wire molded into it and lying on the copper layer of the adhesive strips,
  • 8th the plastic part designed as a plastic molded part when checking the heating wire molded into it,
  • 9 a contact socket shown in a schematic longitudinal section and placed on the plastic molded part with a plug contact molded therein, wherein the plug contact rests on the copper layer in its contacting subarea remote from a contact lug, and wherein the contact socket placed on the plastic molded part is connected by ultrasonic welding via an energy director,
  • 10 the contact socket 9 during the soldering of the contacting portion of the plug contact to the copper layer through an opening provided in a mounting base of the contact socket,
  • 11 the contact socket attached to the plastic molding when checking the electrical contacting of its molded plug contact on the one hand and the copper layer exposed on the plastic molding on the other hand,
  • 12 several plastic molded parts provided and packed on a tray,
  • 13 the plastic molded part in the exposed partial area of the adhesive strip carrying the copper layer and the at least one heating wire lying on it,
  • 14 the exposed area in the plastic part between the adhesive strip and the heating wire,
  • 15 the in the 13 and 14 illustrated section of the plastic part designed as a plastic molded part in a longitudinal section through the adhesive strip carrying the copper layer and the at least one heating wire lying on it,
  • 16 the plastic molding shown in a partial longitudinal section in the area of the adhesive strip carrying the copper layer and the at least one heating wire lying thereon, the at least one heating wire being electrically connected to the copper layer of the adhesive strip,
  • 17 the in 16 shown area of the plastic molded part in a perspective top view,
  • 18 a contact socket placed on a plastic molded part in the area of its mounting base resting on the plastic molded part, with the partial contacting area of a plug contact molded into the contact socket being placed in a flange-like, protruding outer peripheral edge area of the mounting base, and with a contacting portion leading to the partial contacting area of the plug contact being placed in this protruding peripheral edge area opening is provided
  • 19 the contact socket shown in a longitudinal section 9 until 11 and 18 , wherein the partial contact area of the plug contact molded into the contact socket is electrically connected to the copper layer of the adhesive strip located on the plastic molded part,
  • 20 the adhesive strip on the plastic molded part with the heating wire already electrically connected to it in a top view,
  • 21 a plastic molded part, in which at least one heating wire running in the form of a web is formed, which rests on wire sections spaced apart from one another on adhesive strips which carry a copper layer which is in contact with the heating wire,
  • 22 an electrical connection element designed as a plastic injection-moulded part with plug contacts formed therein and spaced apart from one another, which plug contacts are designed as a protruding contact lug at their free end, while the opposite end region of the plug contacts is designed as an exposed contacting subarea, whose contacting subarea is on the copper layer of one of the adhesive strips seated and electrically contacted,
  • 23 the adhesive strip with the at least one heating wire resting on it, the copper layer of the adhesive strip electrically connected to the at least one heating wire making electrical contact with the contacting subarea of the plug-in contact molded into the plastic injection-molded part,
  • 24 a plastic injection molded part that serves as an electrical connection element and is placed on a plastic molded part, in which plug contacts are provided that are formed as stamped and bent parts, which have an end region designed as a contact lug and an opposite end region designed as a partial contact area, with the end region designed as a partial contact area being plug contacts at least one heating wire is guided in an electrically contacting manner,
  • 25 the plastic molding 24 in a detailed longitudinal section in the area of the heating wire electrically connected to the contacting portion of the plug contact,
  • 26 a contact socket in a longitudinal section, a plug contact molded into the contact socket being electrically connected to a heating wire via the copper layer of an adhesive strip,
  • 27 the contact socket placed on the plastic molded part 26 in a detailed longitudinal section,
  • 28 the in 26 and 27 used adhesive strips with the copper layer connected to the heating wire,
  • 29 a contact socket in which the partial contact area of the plug contact molded into the contact socket protrudes laterally on the fastening base of this contact socket,
  • 30 the contact socket, which is electrically connected to a heating wire via the copper layer of an adhesive strip 29 ,
  • 31 the one with the contact socket 29 and 30 connected adhesive strip and its copper layer with the heating wire lying on it,
  • 32 a plastic part in the exposed part of the heating wire, which has an insulating layer of paint,
  • 33 according to the one in the plastic part 32 embedded heating wire in a detailed view in the area of its exposed contact area,
  • 34 the plastic part 32 and 33 in a cross section through the contacting area of the heating wire embedded in the plastic part in section plane AA according to FIG 32 , whereby the contact area of the heating wire is freed from the insulating lacquer layer,
  • 35 the plastic part from the 32 until 34 , wherein an adhesive strip carrying the copper layer is laid over the contacting areas of the heating wire, and wherein the electrical connection of the copper layer designed as an adhesive strip on the one hand and the associated contacting area of the heating wire on the other hand is effected by an electrically conductive adhesive layer,
  • 36 the plastic part from the 32 until 35 in a detailed plan view in the area between one of the contacting areas of the heating wire and the adhesive strip carrying the copper layer, the adhesive layer effecting the electrical connection being laid over the contacting area of the heating wire and the adhesive strip,
  • 37 the plastic part from the 32 until 36 a cross-section through cutting plane AA in 35 ,
  • 38 a plastic part with an inserted heating wire, the heating wire being stripped of paint and exposed in a contacting area for contacting with a socket or similar electrical connection element,
  • 39 according to the exposed contact area of the plastic part 38 inserted heating wire in a detailed top view,
  • 40 the plastic part from the 38 and 39 in a detail cross-section through section plane AA in 38 , the exposed partial contact areas of the at least one heating wire inserted in the plastic part being clearly visible in this detailed cross-section, and
  • 41 the plastic part 38 until 40 in a detailed cross-section through a socket or similar electrical connection element, this socket being electrically connected via an electrically conductive adhesive layer to the contacting sub-areas of the plug-in contact embedded in the plastic part.

In the 1 until 41 Various versions of a method are shown, which are intended for the production of a plastic part 1 from a plastic film or plate 2 with at least one heating wire 3 arranged in the plastic part. The plastic part 1 can retain the plate-like shape of the plastic material used for it. However, in order to be able to accommodate, for example, the radar antenna of a motor vehicle radar system in a protected manner behind the plastic part, an embodiment is preferred in which the plastic part 1 is designed as a three-dimensionally shaped plastic molded part and is made of a plastic material that can be deformed, in particular in a thermoforming process. So that the plastic molded part 1, which is exposed to the weather-related environmental influences on the outside of the molded part, can be heated if necessary and, for example, freed from a layer of ice or snow, at least one heating wire 3, preferably as fine as a hair, is molded into the plastic molded part 1. This at least one heating wire 3 can be electrically contacted via at least one electrical contact socket 4 or a similar electrical connecting element, which is arranged on a flat side of the plastic molded part 1 .

So that the plastic molded part 1 can be used, for example, as a radome for a motor vehicle, under which radome a radar antenna is housed in a protected manner, the plastic part 1 is made from the plastic film or sheet 2 . In order to be able to design the plastic molded part 1 with a closed and hole-free molded part surface, particularly in the area of the sensitive heating wires 3 and their contact points with the vehicle electrical system, the method described here provides that the at least one heating wire 3 is connected via at least one Side of the plastic part arranged contact socket 4 or the like electrical connecting element is electrically contactable. For this purpose, the at least one heating wire 3 arranged in the plastic part 1 is determined in at least one as a contact point Contacting area stripped of paint or the like exposed before the at least one heating wire 3 can be electrically contacted in the exposed contacting area with the electrical contact socket 4 or the like electrical connecting element in a subsequent process step. That based on 1 until 41 The method described thus provides for the contacting of at least one heating wire 3 placed on or in a plastic part 1 and at least one contact socket 4 or similar electrical connection element, with the plastic part 1 being characterized by an unperforated, closed surface in the contacting area of the heating wire 3.

Since a hole for introducing the heating wires 3 is no longer required for contacting the heating wires 3 with the contact socket 4, the heating wires 3 are also arranged protected in their contact area below the outer flat side of the plastic part, which is preferably designed as a plastic molded part 1. To contact the heating wires 3, in a subsequent process step, the at least one contact socket 4 or similar electrical connecting element is placed on the plastic film or plate 2 and a plug contact 6 arranged in the contact socket 4 is electrically connected to the heating wire 3 in an associated contacting area.

An embodiment of the method described here for the production of such a plastic part is based on the 1 until 12 illustrated in more detail:

In 1 it is shown that a plastic film or sheet 2 is provided for the production of the plastic molded part 1 . A copper layer 5 is applied to the flat side of the plastic film or plate 2 that is on the inside when installed. In order to be able to apply this electrically conductive copper layer 5, an adhesive strip 7 is used, which has an adhesive layer that is preferably temperature-stable over 450° C. on one flat side. This adhesive strip 7, which can be separated from an adhesive strip supply and cut to length and/or separated from a preferably roll-shaped adhesive strip supply 9, for example by means of a handling robot 8, is placed on the plastic in the area provided for the at least one contact socket 4. Foil or plate 2 glued on. In a subsequent, in 2 In the method step shown, the at least one heating wire 3 is placed on the copper layer 5 of the adhesive strip 7 and guided with its wire sections protruding over the copper layer 5 in the desired paths over the inner side of the plastic film or plate 2.

In the 3 it is illustrated that the thin heating wires 3 can be electrically connected to the copper layer 5 . In the soldering or gluing station following the laying of the heating wires 3, the contact points between the at least one heating wire 3 and the copper layer 5 can be soldered fully automatically or connected with an electrically conductive adhesive. How 3 shows, the soldering can be done, for example, by mini-wave soldering, without the heating wire 3 having to be stripped of paint and stripped beforehand. In the 4 and 5 is shown that the electrical connection of the heating wires 3 and the copper layer 5 can be done by soldering or gluing with an electrically conductive adhesive or in another suitable way if the heating wires 3, as to 4 described, have been pretreated.

The plastic film or plate 2 prepared in this way is then inserted through an in 6 indicated thermo-forming process brought into a three-dimensional shape. From a comparison of 1 until 7 it becomes clear that the plastic molded part 1, which has been brought into a three-dimensional shape and, for example, has the shape of a segment of a sphere or a spherical curvature, is then punched out of the plastic film or plate 2.

in the in 8th In the subsequent process step indicated, the resistance of the heating wires inserted into the plastic molded part 1 can be measured and the electrical contacting of these heating wires 3 in the plastic molded part 1 can be checked.

Since the heating wires 3 lying on the at least one copper layer 5 are molded into the back-injected plastic molding 1 in the plastic molding 1 prepared in this way, the copper layer 5 and, if applicable, the heating wires 3 laid on the copper layer 5 must be exposed at least in regions. In this case, insulation of the heating wires 3, which consists, for example, of a paint that is preferably temperature-resistant up to at least 180° C. and briefly also up to 420° C., which can consist, for example, of a polysol paint, can also be removed. In the 13 until 15 it becomes clear that the area-wise exposure of the copper layer 5 on the inner flat side and possibly also the wire sections of the at least one heating wire 3 lying thereon can be done by lasering, for example up to about half of the cross section of the plastic molded part 1.

In the 17 and 18 is indicated that on the exposed portion of the copper layer 5 and the heating wires 3, a solder depot 12 is applied before then, for example, in the 18 until 20 shown and serving as a connection means contact socket 4 is placed flat on the exposed portion of the plastic molded part 1.

The in the 18 until 20 , 26 until 28 and 29 until 31 The embodiments shown have on one end of the contact socket 4 an insertion opening 10 for inserting a contact socket counterpart connected to the vehicle electrical system; on the end face of these contact sockets 4 facing away from the insertion opening 10 there is a fastening base 11 with which the contact socket 4 can be placed flat on the plastic molded part 1 . In order to be able to electrically contact the plug contact 6 arranged in the contact sockets 4 with the copper layer 5 , the plug contact 6 is exposed on the partial contact area of the plug contact 6 . The contact socket 4 is now placed on the exposed portion of the copper layer 5 and the heating wires 3 located thereon in such a way that the contacting portion of the plug contact 6 touches the copper layer 5 .

In order to be able to solder the plug contact 6 and the copper layer 5 to one another, in a flange-like projecting outer peripheral edge region 13 of the mounting base 11, the 18 until 20 Contact socket 4 shown has an opening 14 which leads to the plug contact 6 . The plug contact 6 and the solder depot 12 connecting it to the copper layer 5 can be heated through this opening 14 in such a way that the plug contact 6 and the copper layer 5 provided on the plastic molded part 1 are soldered to one another.

At the in the 26 until 28 In the contact socket 4 shown, the contact point of the plug contact 6 and the copper layer 5 provided between the mounting base 11 and the plastic molded part 1 is connected by ultrasonic welding or another suitable method.

At the in the 29 until 31 In the contact socket 4 shown, the flange-like, projecting outer peripheral edge area 13 of the fastening base 11 is interrupted in the area of the plug contact end that projects laterally and serves as the contacting subarea of the plug contact 6, so that the plug contact 6 in the contacting subarea and the copper layer 5 connected via the solder depot 12 is freely accessible.

From a comparison of 20 , 21 , 28 and 31 It is clear that the adhesive strip 7 carrying the copper layer 5 can be designed approximately in the shape of a flag in plan view, with the at least one heating wire 3 being guided over a partial area of the adhesive strip 7 with a tapered cross-section. In this way, a partial area of the adhesive strip 7 that is larger than this is available for making contact with the plug contact 6 and its contacting partial area.

From the 8th , 13 and 21 it can be seen that the plastic molded part 1 regularly has two spaced apart adhesive strips 7, of which one adhesive strip 7 is assigned to the positive pole of the at least one heating wire 3 and the other adhesive strip 7 is assigned to the negative pole of the at least one heating wire 3. It is at the in the 18 until 20 and 26 until 31 Plastic moldings 1 shown on the copper layer 5 of each of the spaced-apart adhesive strips 7 placed a contact socket 4.

In the 21 until 23 the plastic molded part 1 also has two spaced-apart adhesive strips 7 each assigned to one pole of the at least one heating wire 3 . A common electrical connecting element 15 is placed on the copper layer 5 of these adhesive strips 7 , which is designed as a plastic injection-moulded part and carries two molded-in plug contacts 6 . Each of the plug contacts 6 has an end region which protrudes as a contact lug, while the end region of the plug contacts 6 which faces away from the contact lugs is designed as a partial contacting region. This partial contact area of the plug contacts 6 of the in 21 until 23 Connecting element 15 shown is electrically connected to the copper layer 5 of one of the plug contacts 6 .

In the 24 and 25 an electrical connecting element 16 is shown, which is designed as a plastic injection molded part. Also formed in the connecting element 16 are plug contacts 6 spaced apart from one another and designed as stamped and bent parts, which have a protruding and exposed end region as a contact lug. The end regions of the plug contacts 6 facing away from the contact lug are designed as connecting means, via which the at least one heating wire 3 is guided with at least a wire section and electrically contacted. So that the at least one heating wire is not kinked and severed at the edges of the connecting element 16 , the connecting element 16 has ramps 17 on opposite narrow edges, which each lead to the partial contact area of one of the plug contacts 6 . The at least one heating wire 3 can be guided reliably to the associated partial contact area of the plug contact 6 in question on these run-up ramps 17, which are designed as a sloping chamfer on the edge.

The electrical connecting elements 4, 15 and 16 are immovably fastened by ultrasonic welding, by gluing or in some other suitable manner on the side of the plastic molded part 1 which is on the inside in the position of use.

The above-described embodiments of the method according to the invention therefore provide that the heating wire 3 embedded in the plastic part 1 is stripped of the surrounding insulating varnish layer and in this at least one stripped contact area is connected to an underlying adhesive strip 7, which carries a copper layer 5. In order to be able to connect the at least one heating wire 3 in the contact area provided to the adhesive strip 7 carrying the copper layer 5, the wire lying on the copper layer 5 of the adhesive strip 7 is freed from its insulating lacquer layer and exposed.

The contact area of the heating wire 3 on the copper layer 5 of the adhesive strip 7 and the copper layer 5 can be connected by soldering or by means of an electrically conductive adhesive, for example a silver-containing two- or multi-component epoxy adhesive. In the in the 32 until 37 In the exemplary embodiment shown, the at least one heating wire 3 in the plastic part 1, which is laid or inserted on the plastic plate or film 2, is stripped of paint, preferably by means of a laser. In a subsequent process step, the adhesive strip 7 carrying a copper layer 5 is glued to the plastic plate or film 2 forming the plastic part 1 in such a way that a partial area of the adhesive strip 7 rests over the at least one contacting area of the at least one heating wire 3, while another, and here larger, area Portion of the adhesive strip 7 is arranged laterally next to the at least one heating wire 3. The at least one heating wire 3 freed from the insulating lacquer layer in the at least one contacting area and the adhesive strip 7 carrying the copper layer 5 are then connected via an electrically conductive adhesive layer 18 . Thereafter, the copper layer 5 provided on the adhesive strip 7 can be soldered, glued or the like electrically connected to the plug contact 6 provided in the contact socket 4, as is also the case, for example, in FIGS 10 , 11 , 18 , 27 and 30 is shown.

At the in the 38 until 41 In the exemplary embodiment of the method according to the invention shown, the at least one heating wire 3 placed or inserted into the plastic part 1 is stripped of paint, preferably by means of a laser, before an electrically conductive adhesive layer 18, for example a layer made of a silver-containing epoxy adhesive, is then applied to the stripped contact area of the at least one heating wire 3 is applied. Then, in a subsequent process step, the plug contact 6 in the electrical connection element and in particular in the contact socket 4 is connected to the plastic part 1 in such a way that the end region facing away from the contact lug of the plug contact 6 is electrically contacted with the electrically conductive adhesive layer 18. In order to be able to attach the contact socket 4 to the plastic plate or film 2 of the plastic part 1, the contact socket 4 is glued, welded or the like connected to its mounting base 11 on the plastic plate or film 2. The 38 until 40 show the contacting area of the at least one heating wire 3 from which the insulating lacquer layer has been removed. In 41 It is shown that the partial contact area of the plug contact 6 facing away from the contact lug in the contact socket 4 rests on the at least one contact area of the at least one heating wire 3 and can also be electrically connected simply by laying it down.

It goes without saying that the above-described method steps of the method according to the invention can also be combined with one another in further versions that are not illustrated in detail here. Plastic parts and in particular plastic molded parts 1 can also be produced if necessary, in which the electrical contact between the at least one heating wire 3 on the one hand and the at least one plug contact 6 provided in the at least one electrical connecting element, in particular in the contact socket 4, on the other hand can also be produced in a different way he follows. However, it is always characteristic of the embodiments of the method according to the invention claimed here that the electrical contact can be made between the at least one heating wire 3 on the one hand and the at least one plug contact 6 of the at least one electrical connecting element on the other hand, even if the surface of the plastic part 1 is in the region of the heating wire 3 and in particular its contact areas remain unperforated and closed.

Reference List

1

plastic molding

2

plastic film or sheet

3

heating wire

4

contact socket

5

copper layer

6

plug contact

7

adhesive strips

8th

handling robot

9

Adhesive Tape Stock

10

insertion opening

11

mounting base

12

solder depot

13

outer peripheral edge area

14

opening

15

Connection element (according to 21 until 23 )

16

Connection element (according to 24 and 25 )

17

ramps

18

adhesive layer

Claims (22)

Method for producing a plastic part (1) from a plastic film or plate (2) with at least one heating wire (3) arranged in the plastic part (1), which is arranged on one side of the plastic part (1) via at least one heating wire and contact socket (4) serving as an electrical connecting element can be electrically contacted, with the at least one heating wire (3) arranged in the plastic part (1) being exposed in at least one contact area, namely insulation encasing the at least one heating wire (3) in the form of an electrically insulating lacquer layer is removed before, in a subsequent process step, the at least one heating wire (3) is electrically contacted with the electrical connection element in the exposed contacting area, characterized in that to produce the plastic part (1), a plastic film or plate (2) with a in the contact area of at least one heating wire (3) unperforated, closed open surface is used, so that the plastic part (1) is characterized in the contact area of the heating wire (3) by the unperforated, closed surface of the plastic film or plate (2) that on the plastic film or plate (2) in Contacting area of the at least one heating wire (3) an electrical connection means is applied, which electrical connection means is designed as an adhesive strip (7) carrying a copper layer (5) or an electrically conductive contact surface, and that for the electrical connection of the connection means and the at least one heating wire (3) the electrical connection means is either placed on the associated exposed contact area of the at least one heating wire (3) or the exposed contact area of the at least one heating wire (3) is laid over the electrical connection means. procedure after claim 1 , characterized in that the plastic part (1) is designed as a three-dimensional plastic molded part and is made from a deformable plastic film or plate (2). procedure after claim 2 , characterized in that the plastic film or plate (2) is brought into a three-dimensional three-dimensional shape of the plastic part (1) designed as a plastic molded part by a thermoplastic forming process. procedure after claim 3 , characterized in that the plastic part (1) is punched out of the plastic film or plate (2) formed in the thermoplastic forming process. Procedure according to one of Claims 1 until 4 , characterized in that the plastic film or plate (2) after the application of the copper layer (5) or the electrically conductive contact surface and the placement of the at least one heating wire (3) is back-injected with plastic. Procedure according to one of Claims 1 until 5 , characterized in that the adhesive strip (7) on the one hand and a partial contact area of the connecting element having at least one plug contact (6) on the other hand are electrically connected to one another via an electrically conductive adhesive, and in that the connecting element is held on the plastic part by means of the electrically conductive adhesive. Procedure according to one of Claims 1 until 6 , characterized in that the copper layer (5) or the electrically conductive contact surface and/or the at least one heating wire (3) in the plastic part (1) is exposed at least in regions by ultrasound or by laser from a flat side of the plastic part (1). procedure after claim 7 , characterized in that when the copper layer (5) or the electrically conductive contact surface is exposed, insulation covering the at least one heating wire (3) is removed. Procedure according to one of Claims 1 until 8th , characterized in that the copper layer (5) or the electrically conductive contact surface and the at least one heating wire (3) are electrically connected to one another by mini-wave soldering, by piston soldering or by gluing with an electrically conductive adhesive. Procedure according to one of Claims 6 until 9 , characterized in that the adhesive a silver-containing epoxy adhesive, in particular a silver-containing two- or multi-component epoxy adhesive. Procedure according to one of Claims 6 until 10 , characterized in that the connecting element has a bearing surface facing the plastic part (1) and that the partial contact area of the plug contact (6) let into the connecting element is set back relative to a bearing surface of the plastic part (1). Plastic part (1) in a method according to any one of Claims 1 until 11 is produced, and has at least one heating wire (3) arranged in the plastic part (1), which (3) can be electrically contacted via at least one electrical connecting element arranged on a flat side of the plastic part (1), characterized in that the plastic part ( 1) has at least one adhesive strip (7) as an electrical connection means, which (7) has an adhesive layer (18) on one side and the copper layer (5) or the electrically conductive contact surface on the other side facing away from the adhesive layer (18), and that at least one plug contact (6) provided in the electrical connection element is electrically connected to at least one contact area of the at least one heating wire (3) exposed in the plastic part (1) via the copper layer (5) or the electrically conductive contact surface of the adhesive strip (7). Plastic part (1) after claim 12 , characterized in that the at least one heating wire (3) is placed with its at least one contact area on the electrical connection means, namely on the adhesive strip (7). Plastic part (1) after Claim 13 , characterized in that the adhesive strip (7) serving as electrical connection means is placed on the at least one heating wire (3) and is thereby electrically contacted. Plastic part (1) according to one of Claims 12 until 14 , characterized in that the adhesive layer (18) of the adhesive strip (7) is an adhesive layer (18) that is preferably temperature-stable over 450°. Plastic part (1) according to one of Claims 12 until 15 , characterized in that the adhesive layer (18) of the adhesive strip (7) serving as electrical connection means has a silver-containing epoxy adhesive, in particular a silver-containing two-component or multi-component epoxy adhesive. Plastic part (1) according to one of Claims 12 until 16 , characterized in that the plastic part (1) has a closed surface at least in the at least one heating wire (3) enclosing partial area at least on the side facing away from the at least one electrical connecting element. Plastic part (1) according to one of Claims 12 until 17 , characterized in that the at least one plug contact (6) provided on the at least one electrical connection element is designed as a stamped and bent part. Plastic part (1) according to one of Claims 12 until 18 , characterized in that at least one contact socket (4) serving as a connecting element has a front insertion opening (10) and on its front side facing away from the insertion opening (10) a fastening base (11). Plastic part (1) after claim 19 , characterized in that a partial contact area of the contact socket (4) serving as a connecting element is exposed on the side of the fastening base (11) facing away from the insertion opening (10) of the contact socket (4). Plastic part (1) after claim 19 or 20 , characterized in that the contacting sub-area of the contact socket (4) serving as a connecting element, which is intended for contacting with the copper layer (5) or the electrically conductive contact surface of the adhesive strip (7), is arranged in a flange-like projecting outer peripheral edge area (13) of the fastening base (11), and in that an opening (14) leading to the plug-in contact (6) and its contacting sub-area passes through this outer peripheral edge area (13). Plastic part (1) according to one of Claims 12 until 21 , characterized in that the plastic part (1) is designed as a plastic molding and in particular as a mountable on a motor vehicle radome or the like spherically or cone segment-shaped shell to protect an antenna system from disruptive weather conditions.

Images