The term Twin Wall
Polycarbonate describes a polymer which is composed
of many identical units of bisphenol A
connected by carbonate-linkages in its backbone
chain. Chemically, a twin wall carbonate group is a
di-ester of carbonic acid, the result of which is a
polymeric chain. Twin wall polycarbonate is
transformed into the required shape by melting it
and forcing it under pressure into a mould or die.
There are two dominant processes involved in making
products from twin wall polycarbonate:
Extrusion :
The polymer melt is continuously pressed through an
orifice which gives the molten
polymer its final shape. This process makes it
possible to create infinitely long pipes, profiles
or sheets.