Electric heating – Heating devices – With heating unit structure
Patent
1997-05-30
2000-02-01
Paik, Sang
Electric heating
Heating devices
With heating unit structure
219529, H05B 334
Patent
active
060205784
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an electric heating element, in particular in the form of a tape, web or mat-shaped electric heating element, having an electric line arrangement provided therein, and to an associated method for preparing the same.
Large-area electric heaters using heating mats have been disclosed, for example, by the journal "Elektrizitatsverwertung" [Making use of electricity], Volume 52 (1977), No. 3. This known heating mat comprises a resistance conductor having a plurality of wires, over which an insulating sheath having long-term resistance to heat is applied. Over this there is a covering of heat-stabilizing PVC. These heating loops are covered with a film made of thermoplastic in the vacuum deep drawing process. As a result, the heating conductors are fixed at the necessary spacings. Heating mats with PTC resistor connections on one or both sides are provided.
Heating mats of this type can be used, for example, as floor heaters or free surface heaters.
Trace heating of process pipelines using self-regulating heating tapes has been also disclosed, for example, by the journal "3R international", Volume 24, Issue 7, July 1985. In this case, this concerns a so-called self-regulating heating tape, which is composed of a semiconductive plastic tape into which two parallel-guided copper stranded wires are inserted at a spacing of 5 to 15 mm. The semiconductive plastic is electrically insulated by a polyolefin or by a fluoropolymer.
Depending on the field of use, the heating tape is additionally provided with a metallic protective braid and/or an additional plastic covering. The semiconductive plastic tape forms the heating element. It is composed of a graphite-filled, radiation crosslinked polyolefin, fluoropolymer or similar material. The proportion and distribution of the graphite determine the electrical resistance. It rises sharply with increasing temperature, that is to say the tape has a positive temperature coefficient (PTC). The heating tape therefore regulates its emitted heating power via its temperature-dependent resistance at each point of the pipework (irrespective of the position of the sensor of the thermostat), depending on the local circumstances.
It is the object of the present invention to provide an electric heating or thermal element, as well as a method for producing the same, which in principle can be configured to be flat in different size dimensions, and which at the same time is also simple to produce in terms of production technology. The heating element is intended at the same time to have beneficial electrical properties for use as a heating and thermal element.
According to the invention, the object is achieved with respect to the thermal or heating element according to the features specified in claim 1, and with respect to the method for its production according to the features specified in claim 15. Advantageous embodiments of the invention are specified in the subclaims.
Using the present heating or thermal element according to the invention, a completely novel route is being pursued.
In the case of the electric heating or thermal element according to the invention, to be specific the at least one wire used is present in the form of a mesh product. The type and form of this mesh product can be selected in a completely diverse manner. For example, production on weaving, braiding or Raschel machines is possible. Likewise, fully diverse types of construction of the meshes are possible. However, it is furthermore provided according to the invention that the mesh-shaped electric wire conductor, which is not provided with any insulating covering (in order that the meshes can form multiple electrical contact with one another), are [sic] incorporated in a shrinkable bond or composite.
This additionally provided, shrinkable composite material ensures that, by means of the shrinking provided according to the invention, the individual wires, that is to say the individual mesh wires, are pressed against one another. As a result, a specific comprehensive contraction of the ind
REFERENCES:
patent: 1703005 (1929-02-01), Hewitt
patent: 2396099 (1946-03-01), Hartwell
patent: 2670620 (1954-03-01), Goldstaub
patent: 2797296 (1957-06-01), Fowler et al.
patent: 2922867 (1960-01-01), Crump
patent: 2967415 (1961-01-01), Ford et al.
patent: 3448573 (1969-06-01), Glen et al.
patent: 3472289 (1969-10-01), Webber et al.
patent: 3748844 (1973-07-01), Pacofsky
patent: 4143197 (1979-03-01), Jasionowicz et al.
patent: 4876774 (1989-10-01), Kavesh et al.
patent: 5484983 (1996-01-01), Roell
Database WPI Week 8530 Jun. 18 1985 Derwent Publication Ltd., London, GB; AN-85-181952 and JP-A-60-111653.
Kellenberg, German Magazine Elektrizitatsverwertung, JG. 52 (1977) Nr. 3 "Elektrische Grossflachen-heizungen mit Heizmatten", pp. 52-54.
C.D. Claassen, "Heat Tracing of Process Piping by means of Self-Regulating Heating Tapes and Temperatures and Leakage Monitoring", 3R International, Jahrgang, Heft 7, Jul., 1985, pp. 387-392 (German article).
A.u.A. Putz Gesellschaft mbH & Co. KG
Paik Sang
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