A flat pipe with variable flow capacity comprises a main body shaped as a flat tube wherein opposing ridges are installed at the inner upper and lower positions of the main body, and thin-film spacers are installed between said pairs of ridges, forming multiple passages in the main body. According to the proposal, a diagnostic method differentiated with regard to reversible and irreversible damage, as well as with regard to oxidizing and reducing capabilities is provided. In a method of manufacturing the electronic component package tape, the cover tape is held between a first and a second rotating bodies.