integrat vario cs/wh
Cyclic mould temperature control
with water up to 200°C
Dynamic mould temperature control is a temperature control method that allows temperature variations within the cycle and is also known as “variotherm temperature control”. While this method has been known for almost forty years, it has only undergone a dynamic development in the last few years. This is due to the increasingly exacting quality requirements of consumers (e.g. prevention of visible joint-lines, gloss variations and other surface defects) and the use of plastic materials in new applications.
When a temperature control system is selected it is important to mind that it matches exactly with the application and that the economic benefit justifies the technical efforts as well as the energy consumption..
For all applications gwk has got the right temperature control system that can reach fast heating and cooling rates with low energy consumption. Systems of the vario cs series are working with water up to 160°C whereas the vario wh realizes water temperatures up to 200°C. The systems are built in modular design and principally consist of three modules.
The heating process of the mould wall to a high temperature level is affected through a pressurized hot water temperature control with maximum outlet temperatures of up to 200 °C.
The hot circulation medium is pumped through the temperature control channels situated close to the cavity, until a temperature sensor indicates the achievement of the desired mould wall temperature and releases the injection process.
The cooling of the mould wall happens through a temperature controller with highly efficient plate heat exchanger and very low outlet temperature. Hereby an intensive and short cooling phase is ensured. The start of the cooling phase is initiated by a machine signal. After the end of the cooling phase, the mould opens and the heating phase for the next cycle begins.
The shift between heating and cooling phase is affected by a close-to-cavity placed valve unit. The disadvantage of conventional temperature control units that rests on a high energy input due to the change between heating and cooling of the circulating medium, can now be avoided by means of the newly developed energy storage and regulation units. The ESR stores the varying amounts of heat and releases them to the process when the temperature level reverses.The energy buffer is controlled by a micro processor unit which adapts automatically
to the cycle times and the size of the mould.
integrat vario cs/wh
is used in the following processes