The last molding process of mixed silicone rubber is to filter and extrude, and then cool it before packing. What is the main purpose of mixed silicone rubber filtration?

The main purpose of mixed silicone rubber filtration is to remove impurities in the rubber, and then pre shape it in the specified model to form a block size rubber for easy packing, transportation and sales. The main process of mixed silicone rubber filtration is to place a high mesh filter screen in the extrusion molding filter for filtering and extrusion, and then put the mixed silicone rubber rough rubber into the screw. After continuous extrusion, the impurities are removed through the filter screen, and then the rubber is preformed into the specified size block size in the specified model for convenient packing.

The mixed silicone rubber filter screen generally adopts a 200 mesh filter screen. Too high mesh size is easy to cause rubber blockage, and too low mesh size is easy to cause small impurities to still pass through the filter screen. If we encounter slow glue discharge in the filtering process, we should replace the filter screen in time. The frequency of replacing the filter screen mainly depends on the number of impurities in the rubber.

At present, some silicone rubber manufacturers use sulfur and color mixing without filtering, but this requires high workshop environment, and must be dust-free and pollution-free. And the quality and cleanliness of unfiltered mixed silicone rubber are obviously inferior to that of the filtered rubber. The unfiltered rubber material will contain some impurities, so it is easy to cause product scrap when producing silica gel products. If the impurities are too large, they may even damage the mold.

The main purposes of mixed silicone rubber filtration are to remove impurities in the rubber, and to facilitate packing after extrusion and pre molding.

For silicone rubber, please check the details:
https://www.siliconerubbers.net/product-standard-grade-htv-silicone-rubber.html