In the mid 930s, prepolymers of methyl methacrylate were cast into plexiglass (see Polymethylmethacrylate). During the Second World War, unsaturated polyester castings were developed followed by epoxy castings and nylon monolithic castings (see Polyamide) in the 960s. With the development of molding technology, the traditional concepts of casting have changed. Polymer solutions, dispersions (polyvinyl chloride paste) and melts can also be used for casting. Extruded melt flat film extruder, cast on a cooling drum stereotypes, obtained polypropylene film, known as the extrusion - casting method.

• Previous:Application of sand casting in automobile manufacturing indu
• Next:The Causes of Stomatism in Casting and the Solution