EP0098253A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A heating cable and a method of making it
Assignee: KIMA ELPRODUKTER AB
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Filing: 1983-06-23
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Granted: —
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Expires: 2003-06-23
Abstract
Abstract A heating cable has at least two electric conductors (9,10) extending longitudinally of each other in spaced relation. Each of the conductors (9, 10) has an insulating coating (11) which complete covers the respective conductors (9,10) except for apertures (12) in the conductors (9, 10), which are spaced longitudinally thereof. The apertures (12) are arranged alternately in the conductors (9, 10) which are surrounded by a continuous plastic layer (13) or relatively low and substantially temperature-independent resistivity. The plastic layer (13) is in contact with the conductors (9,10) through the apertures (12), and an electrically insulating outer layer (14) covers the plastic layer (13) completely.
Inventors
- 👤 Gösta Rudolf Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 17:32
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/54; H05B3/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
A heating cable including at least two electric conductors (9, 10) extending longitudinally of each other in spaced relation, each of said conductors having an insulating coating (11), characterised in that the coating (11) completely covers the respective conductors (9, 10) except for apertures (12) in said conductors, which are spaced longitudinally of and arranged alternately in said conductors, that the conductors (9, 10) are surrounded by a continuous plastic layer (13) of relatively low and substantially temperature-independent resistivity, said plastic layer being in contact with the conductors in said apertures so that the current flow through the plastic layer is substantially longitudinally directed, and that an electrically insulating outer layer (14) completely covers said plastic layer.
Claim 2
Dependent Claim
117 words
A heating cable including at least two electric conductors (9, 10) extending longitudinally of each other in spaced relation, each of said conductors having an insulating coating (11), characterised in that the coating (11) completely covers the respective conductors (9, 10) except for apertures (12) in said conductors, which are spaced longitudinally of and arranged alternately in said conductors, that the conductors (9, 10) are surrounded by a continuous plastic layer (13) of relatively low and substantially temperature-independent resistivity, said plastic layer being in contact with the conductors in said apertures so that the current flow through the plastic layer is substantially longitudinally directed, and that an electrically insulating outer layer (14) completely covers said plastic layer.
Claim 3
Dependent Claim
24 words
A heating cable as claimed in claim 1, cha- racterised in that the plastic layer consists of a polyethylene plastic or a PVC plastic.
Claim 4
Dependent Claim
20 words
A heating cable as claimed in claim 1, cha- racterised in that the plastic layer consists of a silicone plastic.
Claim 5
Dependent Claim
25 words
A heating cable as claimed in any one of claims 1-3, characterised in that the apertures are spaced apart a distance of about 1 dm.
Claim 6
Dependent Claim
36 words
A heating cable as claimed in any one of claims 1-4, characterised in that the plastic layer of relatively low resistivity is so dimensioned that the effect generated by the heating cable is about 5-30 W/m.
Claim 7
Independent Claim
108 words
A method of making a heating cable including at least two electric conductors (9, 10) extending longitudinally of each other in spaced relation, each of said conductors having an insulating coating (11), cha- racterised in that apertures (12) in the insulating coatings are provided alternately on the conductors (9, 10) at intervals corresponding to the intended supply voltage and the desired effect at said voltage, that the conductors in a subsequent step are provided with a surrounding continuous layer (13) by extrusion of a plastic of relatively low and substantially temperature-independent resistivity, and.that an electrically insulating outer layer (14) is applied by extrusion to cover said plastic layer.
Claim 8
Independent Claim
108 words
A method of making a heating cable including at least two electric conductors (9, 10) extending longitudinally of each other in spaced relation, each of said conductors having an insulating coating (11), cha- racterised in that apertures (12) in the insulating coatings are provided alternately on the conductors (9, 10) at intervals corresponding to the intended supply voltage and the desired effect at said voltage, that the conductors in a subsequent step are provided with a surrounding continuous layer (13) by extrusion of a plastic of relatively low and substantially temperature-independent resistivity, and.that an electrically insulating outer layer (14) is applied by extrusion to cover said plastic layer.
References Cited (Backward Citations)
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US4330703A
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DE3017826A1
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EP0040537A2
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DE3115242A1
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