High power density UGL nozzle heaters0 pages

Application: Heating of Nozzles UGL Nozzle Heaters Figure 1 GENERAL CHARACTERISTICS The UGL is a new family of nozzle heaters, which has been conceived to combine the benefits of PIROFLEX heaters hermetic construction with the non-hermetic PIROSLIM heaters high specific power performances (5 W/cm2). They are best suited in all the applications which do not present specific accommodation constraints or whenever the treated plastic material is corrosive. Their special construction makes them resistant to plastic material penetration thus insuring a good capability of operation even if plastic material leaks from the nozzle. 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) 1. RESISTIVE WINDING made of Nickel/Chrome 80/20 2. ELECTRICAL INSULATION made of high purity continuous mica with a very low presence of binder 3. SHEATH made of stainless steel AISI 304 resistant to plastic material penetration 4. POWER SUPPLY via 2-pole+ground cable with internal conductors in pure nickel, internal insulation in fibreglass-Teflon and external protection by a metallic braid sheath. The cable standard length is 1000 mm, its standard inclination (see Figure 1) is 45°. The cable is welded to the heating circuit. A special outer cap, brazed onto the external sheath, contains the junction between the power supply cable and the internal circuit terminals, guaranteeing an optimum blockage of the cable 5. SPECIFIC POWER 5 W/cm2. 6. OPERATING TEMPERATURE 350 °C 7. CLAMPING onto nozzle via internal hex-head screws (1 screw up to 35 mm width and 2 screws behind 35 mm) 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 UGL 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 UGL 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 100 mm ■ Provide power supply cables with a length that is different from the standard (1000 mm) ■ 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 6 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. s (a c CD 2 O O 4 1/2