The Choice of Thermosetting
The work of thermosetting plastics is an industrial technique which allows to obtain workpieces from polymerized resins under the effect of temperature. He is regularly called “thermoset”.
Unlike thermoplastic injection, the operation is irreversible : polymerized materials can not be crushed, melted again to be reused in the process.
The workpieces obtained by this process are particularly resistant and light. It is a recommended process when you are looking for weight savings without loss of strength properties of mechanical resistance. With a nearby density of 1.4 and a lower production cost, thermosetting workpieces represent an alternative to aluminum (density 2.7). Therefore, this process is increasingly used in aeronautics, and in the household electrical appliances.
Furthermore, its important electrical insulating properties, eased by addition of the relevant metallic inserts make it relevant for uses in electrical compounds.
Once the mould is realized, it will be mounted in a press arranging technical characteristics adapted to the shape of the workpiece, to its size and to the material. The Plast’avenir’s Thermoset presses use the processes of “compression” and “compression transfer.” In the first case, the material is directly put down the mould, later closed so that the polymerization is carried out. In the second, the material is transferred into the mould by injection.
This process always requires a recovery of deburring workpieces, so they can get their final aspect deprived of polymerized material surpluses. This recovery is usually manual, but can be mechanized when products volumes justify it.