The processing temperature of TPU is influenced by several factors, including its hardness. Generally, lower hardness TPU grades have a lower processing temperature compared to higher hardness grades. This relationship can be attributed to the following reasons:

Molecular Structure: The hardness of TPU is determined by the ratio of rigid segments (hard segments) to flexible segments (soft segments) within its molecular structure. Lower hardness TPUs typically have a higher proportion of soft segments, which have lower melting or softening temperatures. Consequently, it requires less heat energy to reach the processing temperature.

However, it's important to note that the specific processing temperature range may still vary depending on the TPU grade, manufacturer's recommendations, and the requirements of the application. It's always advisable to consult the TPU manufacturer's guidelines and conduct proper testing to determine the optimal processing parameters for a specific grade of TPU with a lower hardness.