The widespread use of the universal window system IV 68 has now come up against physical limits, especially when Uw values under 1.3 W/m²K are required. Triple heat protection glazing with Ugl-Values below 1.0 W/m²K are more in demand. The frame thickness required for this powerful 3-layer glass is unsuitable because of insufficient bevel depth. In order to use triple glazing, one needs a wing thickness of 78 mm with the window system IV 78.

 It is possible to rebuild existing tools from the window system IV 68 to IV 78. If you can continue to use the outdated profiling, this conversion is relatively inexpensive to manufacture. Machines with 80 mm fixed stroke are still widely used in Companies. Maximum design limits are exceeded with larger tool sets in these machines. IV 78 is still feasible by nesting on the spindles. Machines with 80 mm fixed stroke are almost inaccessible for more window profiles, because you have to accept unused mounts on the spindles and cannot place enough tools on the machine. In addition, tool splitting is very limited with a fixed stroke.

 Also forseeable is a further tightening of the Energy Saving Ordinance in the near future with Uw-values below 1.3 W/m²K. The insulation value of the frame plays an increasingly important role in relation to the total insulating value of the window. Soon wooden window manufacturers have to deal with thicknesses of 80 to 110 mm which correspond to the window systems IV 92 and IV 105.

 As long as flow pass machines have a freely programmable, electronic hub with a servo drive (depending on the vendor and type), the window manufacturers can switch to IV 90 or greater dimensions relatively easily. The availability of such used machines on the market is limited. There are no problems regarding transition to stronger window systems using CNC technology as long as the quality of the machine with respect to stability and performance is given and custom clamping systems are available.

 CNC technology is the best solution for the future in terms of the flexibility of the window systems to be used, quick easy conversion and space- and energy-saving production processes (single-part production).

 Let Siebert engineering advise you system-neutrally. We know what we're talking about. We can explain to you the advantages and disadvantages of the different systems objectively and you can make a good future-oriented investment decision for your business.