Is extrudable as long as the melt index is low enough?

Is extrusion suitable as long as the melt index is low enough? The answer is no.

First, it depends on the temperature and pressure used in the test. Although the ASTM D1238 standard gives recommended test conditions for most materials, these test conditions are not applicable to all materials, especially some modified materials. Therefore, the lower MFI is likely due to the use of lower temperature or pressure in the test, both of which result in a reduction in the melt flow rate.

Second, some materials are too sensitive to temperature and pressure, and even a low melt index measured at a particular temperature and pressure does not mean that such materials are suitable for extrusion. Because once there are some small fluctuations in temperature or pressure, the flow rate of the material will change greatly, and the stability of extrusion cannot be guaranteed. In actual production, fluctuations in temperature and pressure are inevitable.

 In addition, in the actual extrusion process, there are too many factors affecting the extrusion process, and the material itself will undergo more complex changes, which cannot be accurately simulated by the melt flow rate meter. The melt index can only approximately characterize the thermoplastic flow characteristics of the material and serve as a reference.

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