How should filtration equipment be selected in the production of biaxially oriented films?

In the extrusion production of biaxially oriented films, a suitable melt filter must be selected to ensure uniform melt plasticization and to remove unmelted particles and impurities from the melt. This is especially important when the material contains regrind or recycled material, as strict filtration is required to prevent tearing during film stretching. Filters are generally classified into coarse filters and fine filters. Coarse filters typically use stainless steel screens with mesh sizes of 60–80 μm, while fine filters are mainly column-type filters, each filter element being fitted with a combination of stainless steel screens with mesh sizes of 40/60/100–120/60 μm. Generally, a higher mesh count and smaller mesh size provide better filtration; therefore, a slightly higher mesh count is usually selected. However, an excessively fine mesh increases the frequency of screen replacement and raw material consumption.
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