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Text version of the page
| Hot Runner Nozzle Heaters | ||||||||||||||||
| Precise wattage distribution and tight tolerance • Reduces part scrap • Provides more consistent results than traditional methods • Able to maintain consistent temperatures as the system is running Positive resistance coefficient • Improves response time, controllability and heater life • Faster ramp to operating temperature Overall Results: The customer experienced benefits of cost savings on steel, additional machining; purchasing one heater (manifold) versus multiple tubulars, decreased overall power consumption, faster system response and a higher part yield. This customer has plans to order additional thick film technology heaters to incorporate into additional systems. | ||||||||||||||||
| Case History Hot Runner Nozzle Heaters Problem: An injection molding customer required a more efficient heating method for their hot runner system to increase start-up and throughput. A segment where hot runner systems have been readily adopted is in the production of plastic preform parts (unblown bottles). This particular molder was utilizing multiple plastic resins with melt temperature ranges of 176°C to 301°C (350°F to 575°F). Thick film technology heaters have an operating range up to 500°C (932°F) and due to the overall efficiency and low profile; they were an ideal heating method for this hot runner system. The heated nozzle section of this hot runner system utilized cable heaters to keep the melt at temperature. The customer found that the loose fitting wound heater design was not providing an even thermal profile on the nozzle resulting in lost efficiencies. Therefore, a different approach was required. | ||||||||||||||||
| Solution: Multi-zone distributed wattage thick film nozzle heaters from Watlow. The thick film heating technology offered the OEM multiple benefits to meet the needs of the application. Watlow's thick film nozzle heaters provide OEMs and molders with the following advantages: Low radial ink / substrate profile -0.9 mm (0.035 in.) • Allows for higher nozzle density in the tool. • Allows for use of larger nozzles with larger feed into a smaller hole resulting in more plastic throughput. • Permits water jackets to be closer to the nozzle; better control resulting in higher part yield. Construction • Provides uniform surface contact along the nozzle- even thermal profile • Increased controllability of the system; thermocouples are separate from the heater and immersed into the body of the nozzle, resulting in a more consistent process temperature reading • Flexible leads allow for greater manipulation in wiring channel, which provides greater manifold design flexibility • Moisture and contamination resistant • High-temperature molded termination | ||||||||||||||||
| x — a j ? e n tt a o z M N. A a O as | ||||||||||||||||
| Thick film nozzle heaters provide a superior temperature uniformity capability by putting the energy exactly where it is needed by the application. | ||||||||||||||||
| 139 | ||||||||||||||||