Goods offers - Kvirin Ltd.
| Rubric | Goods offers |
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| Date | 18.11.2005 | |||||||||||
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| Print thick-film heaters (TFHE) on steel-ceramic substrate
WIDELY APPLICABLE FROM \"KVIRIN\" Ltd. Print thick-film heaters (TFHE) are manufactured by \"Kvirin\" Ltd. in completely different way than the ordinary heating elements. TFHE element consists of a stainless steel or ceramic base (plate), on which an insulation layer, than a layer of resistive paste, a contact paste and finally a protective insulation layer are printed. The individual layers are applied by screen printing and each layer is dried and fired afterwards. Thus precisely manufactured TFHE feature a quick temperature rise, extremely low thermal capacity and minimum temperature fluctuations. Its huge efficiency 70-95% depends on the mode of operation (direct or indirect heating). The elements feature excellent corrosions, easy cleaning, high reliability and long lifetime. The given technology allows a method of painter\'s to a seal with the subsequent hot fair to render functional (dielectric, conducting or resists) pastes as film thickness 20-40 microns on a surface of various materials: metals, ceramics , etc. Thus TFHE represents \"sandwich\" from 2 or more films which is put on a surface subject to heating. Feature and originality TFHE, consists that the pastes developed by us for a wide spectrum heating thick films do not contain some precious metals and are made of refractory connections which stocks are not limited. Cost of the pastes almost on the order below offered today in the world market. Technical characteristics TFHE - Substrates - metal, ceramics - Composite pastes : (dielectric, resistive, contact) - Possible overall dimensions TFHE ﾷ Length - from 3 - 500 mm ﾷ Width - from 1 - 250 mm ﾷ Thickness - from 0,5 - 5 mm ﾷ The cylinder - fromØ 2мм(length 10 - 300 mm) - Power voltage - from 1,5V to 750V the AC, DC - Specific superficial resistance of a resistive layer. An ohm / square - 0,05 - 50 - Change of resistance during heating operation for 6000 hours, % - no more than 5 % - Penetrative voltage - not less 1250V - The maximal capacity of dispersion - 50 Wt/sm ² - The maximal working temperature - 650 °С Among advantages it is necessary to note the following: Lowered power consumption At achievement of identical thermal effect a current consumption at TFHE, for 30-40 percent is less, than at usual heaters. The area of contact on which there is a heat transfer between a heating film and a surface of a substrate in TFHE incomparably is higher, than at traditional heaters. It provides preferable and instant transfer of heat to a heat receiver, considerably reduces losses in an environment, and also - enables to lower thermal resistance essentially. The competitive cost price At a mass batch production the cost price discrete TFHE, created with use ТP of technology, can be, on the one hand, wire TAN\'S equal cost price of the same purpose, and with another - to make only 50 %. Certainly, that cost price ТP of the heating layers put directly on a heat receiver, being an element of a design of any device, even below. Reliability During spent technical tests the TFHE in 1,0 Кwt, created on ТP technologies, has shown practically unlimited term of operation, having worked on today already more than 20000 hours. While the warranty period of operation of standard electric rings for kitchen electric stoves or individual electro bars of different world manufacturers usually makes 2000-3000 hours. The reason of so long term of work of rings of new generation speaks a number of factors. In particular, that: а/in TFHE the functional layer is protected from contact with air by a dielectric thick film, and ionic diffusion in the refractory connections used on ТP of technology as a resistive material, at working temperatures practically is absent. At the same time, owing to oxidation and ionic issue nichrome and-or other alloys the cross-section section of a wire in TANS at working temperatures in due course decreases, that, finally, results to it burn-out; b/at identical thermal effect TFHE usual TAN\'S heating element works in considerably more facilitated mode, than. As on ТP the heating film is put on a heat receiver, directly transferring it is warm, their temperatures practically do not differ. At the same time, owing to thermal losses and in TANS, and by transfer of heat to a heat receiver, the temperature heat-up a heating string of TAN is higher than temperature of a heat receiver. Self-regulation of capacity The technologies of TFHE created with use ТP do not require external regulation as materials of these films possess positive effect (high positive temperature factor of resistance). In other words, on the one hand, with rise in temperature electric resistance which limits a current and, hence, capacity grows. With another, at Intensive selection of heat the temperature, and with it and resistance ТFHE that conducts to increase of capacity falls. Thus, the heater quickly restores a temperature mode. Property of self-regulation protects the equipment from overheat and insufficient heating, providing stability of temperature parameters in an operating time. It is necessary to note, that ТFHE with use of precious metals do not possess such properties since them ТКС it is close to zero. In turn, the thermal devices, using TANS, are equipped with gauges of temperature and circuits of management of a current in a circuit of power supplies with the purpose of stabilization of a thermal mode and protection from overheat. Low thermal inertance Direct transfer of heat from a heating film on a substrate causes extremely low thermal inertance designs which provides a fast output of the heating device on an operating conditions. Given feature ТFHE opens new opportunities for their special application. Uniform heating ТFHE provides uniform heating a heat receiver. Thus such advantage is achieved by the design. In the settlement way, optimizing topology of the put figure of a heating film, it is possible to achieve absolutely uniform heating of a heat receiver in view of non-uniformity of dispersion of heat which takes place in real conditions of operation. A variety in drawing ТFHE gives an opportunity of manufacturing of a heater as directly on a surface of the heat receiver being a detail of any device, and as discrete ТFHE, established, as well as TANS, in this or that device. The layer of a heater can be rendered not only on dielectric, but also metal (with a dielectric covering) substrates that provides high mechanical durability and thermo stability ТFHE and also - higher in comparison with TANS specific capacity and working temperature. A variety in application Use ТFHE opens ample opportunities for creation small and micro heaters on any voltage. Discrete TFHE can have the form of a plate thickness from 0,4 mm and thus to possess much smaller dimensions, than TANS of the same capacity. TFHE was created micro heaters in the size 1 cubic мм, developing on air temperature up to 450ºC. Besides ТFHE is an opportunity of reception of heaters with over the big useful area. Are developed also micro soldering irons by capacity of 16 Watt (220В). Using wire heaters it is simply impossible to achieve same reliability. Standard soldering irons with wire heaters of the same capacity are usually designed for a vltage in 12В and at work use a special power unit that raises cost of a soldering iron in 2 and more times. It is necessary to note and that ТFHE provides simplicity of development and manufacturing of new designs TFHE of any configuration, a voltage, capacity. Development of new kind ТFHE to be reduced, on - to an essence, to calculation of structure and preparation of the pastes providing necessary parameters of a resistive layer, and manufacturing of cliches of a new configuration according to the put specific target. Visual quality assurance Quality put on a substrate heating films any topology (with any figure of a resistive layer) is easily supervised visually at all production phases, and in case of detection of defects the heater can be beforehand rejected and restored. After passage of the tests stipulated for such kind products, ТFHE, get extremely high degree of reliability much more exceeding reliability of usual TANS which quality check can be carried out by only indirect methods. High adaptability to manufacture ТFHE is a simplicity of fastening of flexible electro taps. In other words, is a high adaptability to manufacture and small labour input of production which easily gives in to automation. Spheres of application ТПНЭ - Industrial drying chambers (repair trucks) - Heating premises (ovens, heaters, conditioners) - Heating vehicles (railway, trams, trolley buses) - Drying wood, mushrooms, fruit, medicinal grasses - Preparation of foodstuff (electric plate, ovens) - Having heated waters (boilers, electric kettles, pools) - Heating baths with an excited environment - sterilization medical tools - The packing industry - Heating industrial compression moulds for moulding - In products (soldering irons, laboratory little tables, drying of footwear, etc.) |