Synthetic resin is a high-molecular polymer produced artificially through the polymerization of low-molecular monomers such as ethylene, propylene and chloroethylene etc. The most common industrial polymerization technique are bulk polymerization, suspension polymerization, emulsion polymerization and solution polymerization. Synthetic resin is typically a solid which would soften when heated. There is typically a temperature range within which synthetic resin would melt or soften when heated. In the presence of an external force, synthetic resin may exhibit a plastic flowed.