St Augustin, Germany – Hennecke has developed a new horizontal mould carrier to help make hot water tanks semi-automatically with polyurethane in place of expanded polystyrene.
Daikin Europe, based in Ostend, Belgium is using Hennecke machinery to insulate the hot water tank in its range of Altherma floor-standing heat pumps.
Hennecke said it worked with Daikin to develop a time-efficient process and that it makes hot water tanks which do not have thermal bridges.
In the Hennecke system, foaming takes place between the outside of a plastic tank and a plastic sheath which forms a barrier with the metal moulds. Once the tank assembly and sheath are assembled, they move horizontally into the mould. These are pneumatically locked. Foam is added under the plastic sheet which then cures.
Once the foam is cured the insulated hot water tank is pushed out of the mould for easy removal.
Hennecke said that the foam insulates the tank and holds all of the connections firmly to the tank. This makes it more robust than earlier designs
A manually-guided MT22 mixhead is used to dispense the reacting polyol/isocyanate mixture. The machinery company said a 650/650 Topline dispensing machine meters the components. This works with hydrofluoroolefin blowing agents and can automatically adjust the formulation to meet the demands of different sized tanks.
IBC containers store the raw materials. The IBCs are maintained at the correct temperature in Hennecke’s IBC station. Using IBCs like this helps to reduce the cost of the system, the machinery company said.
The hot water tanks are available in 180 and 230 litre sizes. Both have the same diameter and can be produced on the flexible system, said the machinery company. Daikin expects to produce around 25,000 of these hot water tanks each year.