Abstract: A pair of sheets (46 and 48) are held by vacuum on a pair of spaced drums (30 and 32). A rigid board (51) is moved between the drums (30 and 32) whereafter the drums are moved toward each other to adhesively attach leading edges of the sheets (46 and 48) to opposite sides of a leading edge (50) of the rigid board. As the board (51) is moved away from the drums (30 and 32), the drums are indexed to release successive sections of the sheets (46 and 48) which extends the sheets in a wrinkle-free condition. As the board (51) continues to be moved away from the drums (30 and 32), the successive sections of the sheets (46 and 48) are maintained spacially from the board and in the wrinkle-free condition by various facilities such as a vacuum shoe (52), a shelf (53), a vacuum tensioning tube (56) and vacuum bars (57 and 58). Eventually, the wrinkle-free successive sections of the sheets (46 and 48) are brought into engagement with the board (51) and attached thereto by laminating rollers (59 and 60).

Abstract: A continuous flexible web includes a flat, flexible, non-conductive substrate with copper cladding on at least one major surface of the substrate. Prepunched holes may be formed in and through the web and may provide through-hole connections between printed circuits ultimately formed on opposite sides of the substrate.Successive sections of the web are indexed through a screen printing apparatus. A photocell system cooperates with preformed through-slots formed selectively in the web and windows formed in a platen beneath the section to precisely locate the platen with the section and relative to a circuit pattern formed in a screen above the section. The underside of the section is then held with the platen and the screen is positioned over the top side of the section. Ink is then flooded onto the screen and ultimately wiped through circuit-pattern openings in the screen and onto the section to form an inked impression of the circuit pattern on the section.