Depending on the application, very thin films and membranes can be prefabricated with an automatic welding machine, processed on site or even welded with laser.
The metal struts are anchored in the floor and then covered with a thin, transparent plastic film. This variant can be found both in the hobby gardener and in professional vegetable cultivation and has many advantages: Harvest protection, especially against bad weather (e.g. heavy rain, hail and snow), earlier harvesting compared to field crops, optimisation of harvesting, protection against pests as well as better use of beneficial organisms, which is an important issue especially in organic farming.
If both films are transparent, i.e. natural, thin films can also be welded using the through-heating process. Here the laser penetrates both welding partners (in this case two transparent plastic films) and hits an absorbing surface which heats up. This melts the films from bottom to top and welds them together. Very complex welding structures are possible due to the local energy input, which can be individually programmed.