KERASTRIP ceramic flat heaters0 pages

Application: Heating of Crowns and of Moulds in Plastic Moulding Machines KERASTRIP Flat Heaters with Ceramic Insulation for Industrial Applications Figure 1 GENERAL CHARACTERISTICS The continuous technological development in the moulding of plastic materials demands to all the machine components high performances and reliability. The long experience in this field and a specific technical solution allowed us to produce a family of heaters which fulfils these tight requirements. They have imposed throughout the market and have made us leaders in this field. KERAPLAST heaters belong to the new generation of electrical heaters for the plastic industry and have become components of primary importance for the smooth operation of the moulding machine. The selection of the best materials, allows to reach very high heating power values and presents several advantages. In particular it is worth to mention: ■ Long Operational Life ■ Energy saving ■ Fast heat conduction ■ Uniform heat distribution ■ High electrical insulation ■ Easy installation ■ Great mechanical resistance to shocks and to tearing applied to the cables ■ Tight manufacturing tolerances The heaters undergo dimensional and electrical controls all along the production phase, as requested by the company Quality Control System that is certified in accordance with ISO 9001:2000 Standard. A 100 % electrical acceptance test allows to verify the compliance of each single heater to the requirements specified in the applicable CEI/EN/UL Specification. In particular, the following tests are performed: ■ Verification of the earth connector efficiency ■ Measurement of the Insulation resistance ■ Measurement of the dielectrical rigidity ■ Measurement of the dispersion current ■ Measurement of the resistance ohmic value APPLICATIONS These heaters are employed in many applications: they are best suited to heat by conduction flat surfaces. In other cases they are inserted in appropriate slots to heat metallic masses. The operational temperature should not exceed 400 °C. Amongst the applications the following can be listed: ■ Extusion dies ■ Moulds for plastic materials ■ Press moulding plates ■ Vacuum plastic moulding machines ■ Ovens ■ Incubators ■ Boilers ■ Test benches ■ Packing Installations ■ Heated desks for food ■ Electrical cabinets (anti-condensatin) TECHNICAL DATA (see Figure 1) 1. RESISTIVE WINDING spiral made of Nickel/Chrome 80/20 DIN 17470, material n° 4869, characterised by large section and consequent low power density, executed with automatic tools which insure long duration. The spiral is uniformly distributed within the circuit which is realised by a mosaic of ceramic blocks. This solution guarantees a perfect distribution of the heat 2. ELECTRICAL INSULATION made of high purity ceramic KER 221 DIN 40685 which presents a high resistance to thermal shocks and a high dielectrical rigidity. The peculiar internal structure of the ceramic insures a rapid and uniform transmission of the heat. Thanks to the high temperatures which are reached and to the particular shape of the mosaic, the heat is transmitted both by conduction and radiation. 3. THERMAL INSULATION made of high purity continuous mica with a very low presence of binder. The material complies to UL (94 V-O) Specification. 4. COVER SHEATH (optional) made of galvanically treated steel. Thanks to its high thermal conductivity, it insures the best heat transmission thanks to its compressing action exerted onto the heating surface. Heaters without external sheath (I.e. composed only by the mosaic, the heating circuit and the power supply cable) can be produced too. In this case the customer shall foresee an adequate slot to insert the heater in 5. COUNTER-FLANGES (optional) made of galvanically treated steel, 5 mm thick. These flanges allow the installation of the heater onto the mounting structure and are provided unless different requests are specified by the customer s c/> c CD 2 O O KERASTRIP