Many polymer-forming processes are essentially two stages; The first phase of the polymer into the production of polymers in the form of powders, granules or sheets and the second stage into the formation of this material into the required shape.
The first phase may involve mixing with the appropriate polymer additives and other polymers so that the material must have the necessary properties.
The second stage of the process to form a generally involves heating the thermoplastic powder, granules or sheets of material to soften, forming a softened material with the required shape and then cooling it. You can visit the website http://limaextrusion.com/en/ if you would like to know more about the plastics extrusion.
For the second phase of thermoset, the process involves forming a thermosetting material into the required shape and then heating them so that they undergo chemical changes to cross-link the polymer chains into the polymer are intertwined. The second stage of the primary process used to form the polymer are:
Plastic Molding: These include injection molding, compression molding, and reaction transfer molding.
Plastic Forming: This includes processes such as extrusion, vacuum forming plastics, plastic blow molding and calendering.
In addition, the polymer product can be formed by the join. The process is: Adhesives, Plastic Welding, Fastening systems such as riveting, press and snap fits and screws.
A process that is widely used for thermoplastics, although it can also be used for rubber, thermosets and composites, is injection molding.
With this process, the polymer raw material is pushed into the cylinder with a screw or plunger, heated and then pushed, that is injected, into cold metal molds.
Pressure on the material in the mold is maintained while it cools and sets. The mold then opens and the components are extracted, and then the whole process repeats.
Compression molding is widely used for thermoset. Polymer powder is compressed between the two parts of the mold and heated under pressure to initiate the polymerization reaction.