The Video shows the process of high pressure forming where the characteristic cushion structure is created.
The expansion is effected with an inflation pressure, which is far above the working or operating pressure.
The characteristic pillow structure of the SYNOTHERM® plate heat exchanger allows for a strong flow of the medium through the exchanger and leads to a high heat transfer coefficients..
As Figure 1 shows, Pillow Plate heat exchangers have a higher heat transfer coefficient h (in W/m²K) depending on the flow rate (in kg/m²s) than tube coil heat exchangers. This causes a higher heat transfer coefficient. The VDI heat atlas  indicates an overall heat transfer coefficient of 150 – 1200 W/ m²K for tube bundle heat exchangers. For double-tube heat exchangers, this coefficient is only between 300 – 1400 W/ m²K, whereas plate heat exchangers have an overall heat transfer coefficient of 1000 – 4000 W/m²K!
As the following basic formula  shows, less heat transfer area A is required to transfer the same power . Consequently, the SYNOTHERM® plate heat exchangers save space, weight, material and costs.
1] J. M. Tran, M. Piper y E. Y. Kenig (2014), Experimental Investigation of Convective Heat Transfer and Pressure Drop in Pillow Plates under Single-Phase Through-Flow Conditions, Chem. Ing. Tech. 2015, 87, No. 3, 226–234; http://dx.doi.org/10.1016/j.cherd.2015.03.031
 Gesellschaft, VDI (2013), VDI-Wärmeatlas. 11. Aufl.. Wiesbaden: Springer Berlin Heidelberg, S.85-87
 von Böckh, P./Wetzel T. (Hrsg.) (2015): Wärmeübertragung, Grundlagen und Praxis, 6. Auflage, Karlsruhe, S.9