Abstract: A winder for plastic film in the absence of a winding core features equalized air lubrication of the wound roll, throughout its axial removal from the arbor. In the preferred embodiment in which a pair of aligned arbors move oppositely for stripping, means are provided for maintaining pressurized air at the roll-engaged support surfaces of both arbors until the arbors disengage the opposite ends of the roll.

Abstract: A machine for discontinuously driving a web moving continuously through the machine, having web pulling means, a web shuttle having the web trained thereabout, shuttle drive means for reciprocating the shuttle to alternately take up and pay out the web, and an endless looped belt drivingly interconnecting the web pulling means and the web shuttle for stopping and starting a portion of the belt associated with the web pulling means and thereby the web pulling means synchronously with the take-up and pay-out movements of the web and web shuttle, in which the web shuttle comprises a pair of shuttle members, a first upstream member and a second downstream member relative to the direction of web movement, each shuttle member being independently mounted in the machine for reciprocation, connected outside the loop of the belt to the shuttle drive means, and secured against the loop of the belt by the drive means for reciprocation of the shuttle members in unison, thereby stopping and starting the portion of the belt

Abstract: A bubble guide of the type employing guide members mounted on elongated, pivoted support arms. Rotation of the guide members, shown in the form of overlapping arcuate segments, results in dependent reverse rotation of the guides relative to the arms, produced by a compensating mechanism, for orientation purposes. Primary crank arms and connecting rods drive all support arms simultaneously and secondary crank arms and connecting rods produce simultaneous compensatory rotation of all guide members. Downward cantilevered mounting of sets of the guide members enables ready access from below and tilting of the sets enables variation in diameter along the assembly. Reaction of one or more guide members to change in the bubble size is employed to regulate cooling air flow into the extruding tube.