DE1565754A1 - Electrical contacting of surface heating conductors made of plastic that has been made electrically conductive - Google Patents

Description

The invention relates to the contacting of surface heating conductors made electrically conductive! Plastic. -To electrically conductive plastic foils to be able to use as a surface heating conductor, it is necessary that for example rectangular or square "heating foil" - a flow of electricity between two each other opposite sides can take place, so the entire film surface as electrical Head-is used for heat generation.

The prerequisite for an even flow of current over the entire In addition to the uniformity of the surface, the heating conductor surface forms the heating conductor itself regarding the layer thickness and the even distribution of the in the plastic incorporated Leitpiimentes a perfect contacting of the current-carrying Electrodes with the conductive iCunststo @ ff over the entire length of the Feizleiterseite. There are contacting possibilities for flexible electrical Ladder, as they do the conductive plastic film and others. is known, e.g. thin metal sheets, threads or strands:, preferably made of iLupfer, _silver or aluminum, which are sewn onto the surface heating conductor or worked into it. Also be ivetallpulver for lion clocking with a suitable-binder as-electric Conductive paint recorded or sprayed on such as conductive silver, or molten liquid Aletall aufgest: iubt .eie z.ß. liquid zinc, iras only for thermally very insensitive ones Plastics can be applied.

With all of the above; Hearing i% onectieriin,; sarten occurs a certain Discrepancy due to incomplete contact or limited contact up. So could .: with aiifenä hten:.: Metal strips contact gaps between the :: needle stitches arise, even with interwoven h: metal threads are only a loose 1st contact with the surface heating conductor available. It would be best to join forces, aa for thermoplastics Plastics the spraying of liquid zinc does not come into question that:, contacting; through conductive silver. But for me, the shelf life of the i, oritakte is limited by the more or less good adhesion of the applied layer and the one with the Time-based oxidation of the silver on the surface.

In order to exclude this susceptibility to oil and with it the operational safety To increase the surface heating conductor is proposed according to the invention, the power supply to encase with the plastic made conductive. For cold or warm curing: plastic This happens in the following way: the stripped cable strands or even smooth ones or perforated metal sheets that are soldered to the power supply lines in the still liquid or plastic, made conductive, embedded and overlaid and this is only then hardened.

In the case of thermoplastics, the metal strands can be inserted into the finished surface heating conductor by: thermal influence (Ilochfrequeriz or Joulesche Heat) are welded into the softening plastic mass so that the power supply lines be completely or for the greatest part surrounded by the conductive plastic. Particularly Good contact results when the points of the lead manager to be contacted is coated beforehand with conductive silver. On the other hand, the power supply lines can also in the production of the lleizleiter, e.g. lleizfolie, be it during extrusion or during calendering, in the not yet solidified, plastic plastic with come in. In this way it can be achieved that already during production a certain type of heating foil with the one suitable for your later application Contact spacing can be equipped continuously.

In both of the methods that can be used for thermoplastics, the electrical wire (or a differently shaped metallic conductor) can now be contacted with the heating conductor either bare or already encased in conductive plastic. The sheathing with plastic made conductive can be done in a simple -ileise in a Kabeliaoler- # xtruder.

The number of incoming heating foils during the production Supply lines are based on the misunderstandings that apply to the heat regulation of the Slide.

Claims (1)

i- a te ri ta ri s j) r ii che 1o _.le @; tri: @che l, oritzil: tierun, - from rl @: cllerllicizleit.ern from electrically conductive --e;: cl @ t. cia i.uriststoff thereby @; el: ennzeiclinet, that the e7 elztrisclieri ..oril files wholly or partly lu-eise in the electrically conductive @; ci. @ <rc: iteii plastic embeds, earths, whereby an inili.er icontact and, at the same time;:; a Jefesti; ung the itroiuzulei ttiil -_, cii be effected. o., le: -. trische Lontaktierun # = von ü l @; clienl: ei rlei terri made of e7 electrically conductive plastic according to <iiis,) rircli 1 characterized by this, di: i. In the case of the ver-.endun of tliermo "l @ isti scilei, i; unststoffen for the 1, -1: clierilicizleiter the linbed of the electrical hone in this takes place in such a way that the plastic for this purpose through , heat influence (such as, for example, high-frequency swings or fouls, including heats) is plasticized again. 3. I-, electrical contacting of flat heating conductors made of electrically conductive s-made plastic according to @ .ns! Iruch 1. This f_elcennzeichriet, since., With Ver -.- endurig of thermoplastic plastics already during the lier ° position of the Surface heating conductor through extrusion or j: alandrierung die; jtromzufilirurigen in i, 'orm of. :: etall-Litzen, -jirinder o (ler -,) rüliten in the required number and the necessary # .ibst: - # ricieii in the still plastic iyoplastic with shrinking lähto oi: electrical contacting of surface heating conductors made of electrically conductive; characterized in that the elements to be embedded in the plastic are in the form of strands, strands, the metallic or s3rands already before the embedding; It is a thin, tightly fitting electrically conductive t) eiiiacliteri i% .oplastic: iiclit Liiiigeben which has the dike or a lower electrical resistance than that of the surface heating conductor made of i, unststof f. 5. v.lektrische i, contacting of 1-ILcüenheizleitern made of elel # ztri.; Cti made conductive .ioplastic according to opposition 1. characterized e '# c indicates that when using cold or warm bziv. Thermosetting plastics, the contacts in the form of: tietallic wires, strands or smooth or perforated strips are embedded in a suitable manner in the plastic poured in the i, 'ori: i before it hardens.