Patent ID: 7448183

Claim:
An apparatus for sealing a cover foil to a blister foil, the apparatus comprising: a pocket roll centered on and rotatable about a respective axis and having an outer surface formed with an array of radially outwardly open pockets separated by radially outwardly directed lands, the pocket-roll outer surface having a predetermined coefficient of friction; means for feeding the blister foil in a tangential direction to the pocket roll with blisters of the blister foil fitting in the pockets; a seal roll rotatable about a respective axis adjacent the pocket roll and having an outer surface pressing a cover foil against the blister foil, whereby the foils are pinched between the rolls; a plurality of elongated slip inserts set in at least some of the lands, extending axially of the pocket-roll axis between and past the pockets, and forming in the respective lands between the pockets axially extending outer-surface regions having coefficients of friction smaller than the coefficient of friction of the pocket-roll outer surface; and means including a sensor for detecting and adjusting the positions of the blisters relative to the direction by sliding the blister foil on the slip inserts of the pocket roll.