Application: Heating of Nozzles PIROSLIM Thin Nozzle Heaters -t« Figure 1 GENERAL CHARACTERISTICS In many cases only a limited clearance is available between nozzle and mould (e.g. in hot-chamber moulds). In these cases, PIROFLEX heaters cannot be used due to their thickness and PIROSLIM heaters represent the ideal solution. They are characterised by a high specific power (5 W/cm2) and, consequently, are best suited whenever the heat demand in the injection area needs to be increased. Finally, thanks to the employ of stainless steel in the external sheath, these heaters are recommended whenever the melted plastic materials is corrosive (PVC and others). APPLICATIONS These heaters are employed in all the plastic moulding machines where the operational temperature does not exceed 350 °C. TECHNICAL DATA (see Figure 1) INSTALLATION When installing, please make sure that the heater internal surface perfectly adheres to the nozzle. Then tighten adequately the hexagonal-head screws provided with the heater. After initial operation (30 minutes) tighten again the screws in order to compensate the thermal expansion. STANDARD DIMENSIONS PIROSLIM heaters are manufactured in standard dimensions as detailed in Table 1. They are available on stock: to order them simply specify the code. SPECIAL CONSTRUCTIONS When required, non-standard PIROSLIM heaters can be manufactured. In particular it is possible to: ■ Provide heaters with special dimensions provided that the diameter does not exceed 100 mm and the width 60 mm ■ Provide heaters with embedded "J"-Type thermocouple ■ Provide power supply cables with a length that is different from the standard (1000 m) ■ Provide heaters with heating power or power supply voltage that are different from those specified in Tab2le 1 as long as the specific power does not exceed 5 W/cm2. ■ Provide heaters with a hole to allow the introduction of a thermal sensor If non standard power supply and/or voltage constructions are requested, our technical department shall check the feasibility. If a hole to allow the introduction of a thermal sensor is required, a drawing shall be supplied which clearly shows the hole dimension and the desired position. 1. 2. 3. RESISTIVE WINDING made of Nickel/Chrome 80/20 ELECTRICAL INSULATION made of high purity continuous mica with a very low presence of binder SHEATH made of high-conductivity treated steel, closed to prevent plastic material penetration and presenting a high resistance to corrosion POWER SUPPLY via 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 high mechanical resistance stainless steel sheath. The cable standard length is 1000 mm. Thanks to a special construction, the heater package includes at one end, well protected beneath the insulation layers, the junction between the power supply cables and the heating circuit. This solution guarantees a solid blockage of the cables. SPECIFIC POWER 5 W/cm2. OPERATING TEMPERATURE 350 °C CLAMPING onto nozzle by tying-bands provided with internal hex-head screws (1 band up to 35 mm width, 2 bands from 36 to 60 mm and 3 bends behind 60 mm) 4. 5. 6. 7. c/> c CD 2 O O 4 PIROSLIM