Why Rapid Temperature Cycling (RTC™)
It is well known that if a mould surface cavity temperature is near to plastic melt temperature the visible quality of the mouding surface can be much improved. RTC™ is therefore based on the following steps:
▪ First heating the mould cavity surface near to the plastic melt temperature
RTC™ normally uses the medium of steam flowing through conformal channels adjacent to the mould cavity surface to heat the mould, followed by chilled water to cool the mould and plastic. GIWW is now able to offer 2 alternative solutions in addition to steam and we will advise customers of the merits of each alternative depending on their specific project. All 3 solutions steam, induction heating and hot water are summarised below:
RTC™ - SWC heating the mould cavity with the injection of steam into conformal channels within the mould and located near to the mould cavity surface is now a well established procedure and GIWW / OMT are able to offer complete equipment and technology solutions.... more.
RTC™ - IHC heating the mould cavity surface when the mould is open by a 'work coil', through which a high frequency electric alternating current is passed creating a magnetic field which rapidly heats the steel surface. After injection of plastic to fill a mould cavity the mould plate is cooled with chilled water....more.
RTC™ - HWC heating the mould cavity plate hot water at up to 160° under pressure at up to 10bar to prevent evaporation to steam. After injecting the plastic to fill the mould cavity hot water is replaced with flow of chilled water to cool the mould rapidly....more.