When using a blowing agent or micro

When using a blowing agent or microcellular foam process, gas is of course introduced into the plastic in the barrel intentionally. This gas results in a foamed material that will often be used in thick cross sections to avoid sink and reduce weight and cycle time. Because gas is being added to the material splay will be evident across the whole part. There are things that will improve the surface of the part such as gas counter pressure but it will be very difficult to completely remove all of the surface splay when running with a blowing agent or microcellular foam. If blowing agent is introduced into a material that was not intended to be foamed the result will be splay. Treat this like any other contamination in the material.