A connection for the junction of two tubes, through which a fluid under pressure flows, comprises a female element and a male element. A circuit board having thereon at least one copper pad is provided. Heat generated thereby provides fast light-off of the reforming catalyst. The coordinate positions for substantially each of the elements of the mark embedded in the image are detected, wherein the detection is characterised by applying at least one mask to substantially each pixel of the encoded representation. The coating head is provided with two slits: a coating slit and a recovering slit, and the excessive coating liquid having been discharged through the coating slit and applied to the web is scraped-off and recovered through the recovering slit.