Core Blowing Process - Assessment of Core. Sands Properties and Preliminary Model. Testing. R. Dańko *, J. Dańko, A. Burbelko, M. Skrzyński. AGH - University of Science and Technology, Faculty of Foundry Engineering,. Reymonta 23 str., Kraków, Poland. *Corresponding author. E-mail address: [email protected] Four one-dimensional, time-dependent blowing snow models areintercompared. These include three spectral models, PIEKTUK-T,WINDBLAST, SNOWSTORM, and the bulk version of PIEKTUK-T,PIEKTUK-B. Although. Blow molding (BrE moulding) is a manufacturing process by which hollow plastic parts are formed: It is also used for forming glass bottles. In general, there are three main types of blow molding: extrusion blow molding, injection blow molding , and injection stretch blow molding. The blow molding process begins with melting.