Abstract: An apparatus for blow extruding a synthetic-resin tube has a nozzle having an annular mouth generally centered on a longitudinal axis for longitudinally outwardly extruding a tubular synthetic-resin strand, an inner stabilizing tube extending longitudinally outward from the nozzle within the mouth thereof and having an outer end spaced a predetermined longitudinal distance from the mouth, and an outer stabilizing tube surrounding the inner tube and defining a longitudinal passage therewith, extending longitudinally outward from the nozzle within the mouth thereof, and having an outer end lying between the outer end of the inner tube and the mouth. The passage opens outward between the outer ends. Cool air is fed to the passage at the mouth and to a space defined between the strand where it emerges from the mouth and the outer tube for flow of this cooling air longitudinally outward between the strand and the outer tube and from the outer end of the outer tube.

Abstract: The apparatus for calibrating a tubular foil bag comprises at least two iris aperture calibrating devices and at least one segment calibrating device. The iris aperture calibrating devices are spaced from each other and each have a plurality of iris aperture leaves, e.g. sickle shape leaves, which are movable and adjustable with a positioning ring which is mounted in an iris aperture housing. The segment calibrating device has a plurality of curved segments which make up a polygonal structure, which are connected to a plurality of supporting or carrying members and which are adjustable with the aid of an adjusting lever system. The segment calibrating device is positioned between two adjacent iris aperture calibrating devices and the supporting or carrying members are attached to at least one of the iris aperture housings for the iris aperture devices.

Abstract: A vertical foil-blowing die head having a rotatable die is fed by a distributor which communicates centrally with a fixed member, and has a substantially horizontal distributor passage portion extending outwardly beyond the central air ducts for the blowing and cooling air and a vertical portion communicating with the die at a single orifice offset from the center or axis.

Abstract: A method of and apparatus for the formation of synthetic resin foil coils. The angular velocity of the flaw propagating member is reduced as the coil increases for at least a multiplicity of turns to impart to the coil the configuration of a right circular cylinder with a high degree of precision.