In terms of cost, the roll-to-roll self-adhesive film laminator is ultra-small, which greatly saves expensive semiconductor materials; advanced low-temperature process technology can not only save energy and reduce consumption, but also facilitate the use of cheap substitute substrates (Such as glass, stainless steel, etc.). In terms of use, the film solar cell has high temperature resistance and is more suitable for use in areas with high temperatures and deserts; good low-light characteristics allow it to generate electricity even on cloudy days; plus the use of flexible substrate technology, The scope of application has been greatly expanded, including the curved outer walls of various buildings, portable charging bags, etc., all of which can use film solar cells.
According to the different equipment, the roll paper film can be divided into:
Bottom paper composite film compounding-carried out on a labeling machine, using a special composite film with bottom paper, covered with a film under the action of a composite device. This is a traditional laminating method. In recent years, it has been replaced by a process that uses a bottomless paper composite film.

Lamination without backing paper composite film-carried out on the labeling machine, the principle of laminating is basically the same as that with backing paper composite film composite technology. The bottomless paper film is replaced by the surface smoothness (surface tension) of its own material after replacing the backing paper. After the adhesive is bonded to its surface, it can also be peeled off without leaving traces of glue. The material used for the bottomless paper film is a BOPP film with low surface tension. The bottomless paper film has low cost and is currently the most widely used film material.