Molybdenum News Center

Nuzzle Tip, Machined from TZM Rod, Is Essential for Hot Runner System

HRSflow is completing the expansion of its 3,000-square-meter factory in San Polo di Piave, Italy. The expansion was designed according to lean production standards to make the hot runner assembly process more efficient. The goal is to ensure increased production capacity and provide customers with greater flexibility.

Since its introduction into the industry, hot runners have played a key role in improving the injection molding process. Although the capital cost is greater than that of cold runners, its ultra-high production efficiency makes it a long-term and economical choice. The improvement of system performance can produce parts with excellent appearance and increase part functions. In addition, the hot runner improves energy efficiency and saves plastic raw materials, thereby shortening cycle time and reducing part costs.

Companies in the world are implementing hot runners and seeking various solutions for further optimization considering its advantages. Of course, the focus of this article is not on this, but on one of the important parts- hot runner nuzzle tip. 

A hot runner system is an assembly of heated components used in plastic injection molds that inject molten plastic into the cavities of the mold. The used nozzle material is important as it affects production efficiency of the whole system, production cost and quality of finished plastic products. 

Pure molybdenum has a very high melting point, good strength, low thermal expansion coefficient and excellent thermal conductivity, and is a good comprehensive candidate material for most high-temperature applications. TZM is an acronym for "Titanium-Zirconium-Molybdenum", which is a molybdenum alloy. Its production method is powder metallurgy.

Although TZM is 25% more expensive than pure molybdenum, in some applications, the additional cost is offset by its increased strength at high temperatures. The recrystallization temperature of TZM is higher than that of pure molybdenum, which reduces the possibility of embrittlement at high temperatures. In high temperature applications, TZM has higher strength, hardness, creep resistance and ductility, which can ensure that it will not weaken or become soft.

Therefore, titanium-zirconium-molybdenum alloy is the most suitable material for nozzles at present. Chinatungsten Online is known for its high-quality products, outstanding service and attention to detail. The provided TZM rod has strict tolerance control and high processing yield. 

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