Melt index is a key indicator for measuring the flow properties of plastic materials. It reflects the mass of melt passing through a standard pore per unit time at a specific temperature and pressure. For masterbatch, melt index is also an important physical property that directly affects its performance during processing.
The melt index of masterbatch is closely related to its dispersion performance. When the melt index of masterbatch is higher than the melt index of the plastic to be colored, the masterbatch is easier to disperse in the plastic and the color distribution is more uniform. On the contrary, if the melt index of masterbatch is low, it may lead to uneven color distribution, stripes, moire and other phenomena.
In the injection molding process, masterbatch with a high melt index can fill the mold faster, reduce the molding cycle, and improve production efficiency. At the same time, good fluidity also helps to reduce defects in products and improve product quality.
For extrusion molding, masterbatch with a moderate melt index can better adapt to the screw shear force of the extruder and ensure the stability and continuity of the extrusion process. In addition, the appropriate melt index also helps to control the cross-sectional size and shape accuracy of the extruded product.
The melt index also affects the mixing uniformity of the masterbatch and the plastic substrate. A masterbatch with a high melt index is easier to blend with the plastic substrate during the mixing process to form a uniform mixture, thereby improving the overall performance of the product.
It should be noted that although a masterbatch with a high melt index has advantages in processing performance, a too high melt index may cause the masterbatch to flow excessively during processing, resulting in uneven color distribution or surface defects on the product. Therefore, when selecting a masterbatch, it should be reasonably matched according to the specific processing requirements and the characteristics of the plastic substrate.
The melt index of the masterbatch has an important influence on its processing performance. By reasonably controlling the melt index, the performance of the masterbatch in injection molding, extrusion and other processing processes can be optimized, and the quality and production efficiency of the product can be improved.
