The shopping TV station HSE24 relies on the precision offered by Efaflex doors

The lock plays a key role in the logistics of the shopping TV station. “These two doors are the only access to the two studios. They are opened 100 times and more every day”, says Holger Klein. He is the team leader of the sample warehouse. “HSE24 stands for 24 hours of home shopping per day; 18 hours are live. When the shopping TV station went on air in 1995 – still under the name H.O.T. – there was only an old stop gate where there is a modern lock today. It did not at all meet the structural and current requirements. It did not open and close quickly enough and it lacked insulation which led to a considerable loss of heat in the anteroom of the studio. The temperature there must, however, never fall below 20 degrees Celsius. The sensitive technology in the studios requires a constant temperature. Also the samples of the goods and the props must not be exposed to a changing indoor climate. If they are too cold, tension sounds can occur during the programme in the warm studio which would be a risk for the quality of the transmission. And also for this reason, the sounds made by the moving doors must be very low. “When one studio is being prepared, the live programme must not be disturbed by noise. The three metre wide high-speed spiral door EFA-SST is up to both requirements. The 40 mm thick and 225 mm high laths are thermally separated and insulated. Thus, the door has a heat transfer coefficient of approx. 1.5 W/m²K and a sound insulation of 24 dB. Depending on the door blade, the doors can achieve a heat transfer coefficient of 0.7 W/m²K and a sound insulation of up to 26 dB thanks to the EFA-THERM laths. When planning the new door lock, it was important to cope with another task: while the outer access is even with the ground, the inner door has to provide the same clearance height of 3.46 metres behind a ramp as outside. No problem for the specialists of Efaflex: instead of a round spiral, an oval spiral houses the door when moving upwards, so that it does not even hinder vehicles with a high load or sets. The high-speed spiral door EFA-SST has a width of three metres. In order to let daylight enter the lock area and to guarantee more industrial safety, seven of the 16 laths are transparent laths.