SPIRFLEX Application: Heating of Nozzles SPIRFLEX - Spiral Nozzle Heaters - Figure 1 GENERAL CHARACTERISTICS SPIRFLEX heaters represent the ideal solution when nozzles characterised by a very small diameter need to be heated. They are also suited in all the applications where the specific power or the operating temperatures are very high. These heaters, in fact, can be provide a heating power as 2 high as 8 W/cm and can reach operating temperatures up to 600 °C. They can heat nozzles starting from a minimum diameter of 6 mm (8 mm with 24 and 25 series). These heaters need a minimum clearance to be installed: the difference between the heater external diameter (D) and the spiral internal diameter (Di) is always in the range 6 to 8 mm. APPLICATIONS These heaters are employed in all the plastic moulding machines where the operational temperature does not exceed 600 °C. They are particularly useful whenever a limited clearance is available between nozzle and mould (e.g. in hot-chamber moulds). ROLLING To roll SPIRFLEX heaters please use a chuck and operate as shown in the sketch aside. Chuck diameter G shall be < Φ nozzle to compensate the residual elasticity of the heater after rolling. STANDARD DIMENSIONS SPIRFLEX heaters are manufactured in standard dimensions as detailed in the tables below. They are available on stock: to order them simply specify the code. SPECIAL CONSTRUCTIONS When required, non-standard SPIRFLEX heaters can be manufactured. In particular it is possible to: §Manufacture heaters with a length up to 3000 mm (series 24 and 25) or 1200 mm (other series) §Provide power supply cables with a length that is different from the standard (1000 m) or oriented differently from the standard (see figure below for the alternatives) 180° Orientation 90° Orientation §Provide heaters with heating power or power supply voltage that are different from those specified in tables below as long as the following conditions are respected: o Supply Voltage in the range 24 ÷ 250 V o Current below 5A (series 24 and 25) or 4A (other series) o Maximum Power:60 W/100 mm o Minimum power at 220 V: 180 W/300 mm If non standard power supply and/or voltage constructions are requested, our technical department shall check the feasibility. TECHNICAL DATA 1. RESISTIVE WINDING made of Nickel/Chrome 80/20 2. ELECTRICAL INSULATION made of compressed mineral oxide 3. EXTERNAL SHEATH made of INCOLOY 800 4. TERMINAL EDGE welded, water-tight, with about 6 mm neutral section 5. POWER SUPPLY via bipolar cables suitable for high temperatures. The cables internal conductors are in pure nickel, the internal insulation is in fibreglass-Teflon and the external protection is a stainless steel sheath. The cable section is 0.75 mm², its standard length is 1000 mm and the standard inclination (see Figure 1) is 45°. The cables are blocked by means of a bush that is seamed onto the heater sheath thus providing adequate sealing in case some plastic material leaks from the nozzle. The neutral section is made by a couple of nickel-chrome wires that are welded to the power supply cables 2 6. SPECIFIC POWER up to 8 W/cm . 7. OPERATING TEMPERATURE up to 600 °C 8. THERMOCOUPLE (optional) J-type, embedded in the heater, placed 5 mm before the terminal edge and electrically connected by two compensated cables, PTFE insulated, characterised by a section of 0.5 mm² 9. DIELECTRIC RIGIDITY capable to insure a dispersion current below 0.5 mA when 1250V are applied between the heating circuit and the sheath (results relevant to straight element). The same value is guaranteed between heating circuit and thermocouple with test voltage 600V. INSTALLATION When installing, please make sure that the heater internal surface perfectly adheres to the nozzle.

SPIRFLEX Application: Heating of Nozzles Spiral length (packed spires) as a function of the internal diameter Di and of the straight heater length A Elements Φ 4 mm Spiral width with packed spires (mm) SERIES 24 – 25: Straight Elements Φ 4 mm SERIES 38 – 39: Straight Elements square sect. 3.2 mm internal diameter (mm) Elements Φ 3 mm and sect. 3.2x3.2 mm Spiral width with packed spires (mm) SERIES 36 – 37: Straight Elements Φ 3 mm Code Power at B Code (no thermocouple) (with thermocouple) 230V (W) (mm) 4704000315 not available 315 300 4705500500 not available 500 450 4708000800 not available...