Abstract: A hole cutter/punch arrangement that can be changed over quickly to a different hole cutter or punch or slitter, or can instead be converted to a sealer in manufacture of items from plastic film. A reciprocating drive such as an air cylinder is coupled to a transverse mount or holder, of a T-shaped profile and the punches and sealers each have a mounting shoe with a transverse T-profile channel to slide onto the mount where a detent holds the shoe releasably in place. A triple-tree arrangement of a center drive post and left and right guide posts connects to the transverse holder.

Abstract: A hole cutter/punch arrangement that can be changed over quickly to a different hole cutter or punch or slitter, or can instead be converted to a sealer in manufacture of items from plastic film. A reciprocating drive such as an air cylinder is coupled to a transverse mount or holder, of a T-shaped profile and the punches and sealers each have a mounting shoe with a transverse T-profile channel to slide onto the mount where a detent holds the shoe releasably in place. A triple-tree arrangement of a center drive post and left and right guide posts connects to the transverse holder.

Abstract: A bow spreader bar provides lateral stress on a web of plastic film as it travels past. An elongated arcuate bow member is supported on a rotatable support bar that can be rotated by a first actuator to adjust pitch angle of the bow member relative to the plane of the film. A second actuator mounted on a midportion of the rotatable bar has a rod connected to a center part of the arcuate member and adjusts the amount of bow or arc of the arcuate member. A remote control arrangement has a receiver coupled to the first and second actuators and a remote transmitter permitting an operator to control the pitch angle and amount of bow from a location remote from the film processing equipment.

Abstract: Gusset boards of a blown film extrusion apparatus have nose portions that can be positioned in the path of a tube of blown film traveling between the nose portions where the nose portions engage with opposite sides of the tube of blown film and form gussets in the tube of blown film. The nose portions of the gusset boards can also reduce their width dimensions which enables the nose portions to be moved away from the path of blown film traveling between the gusset boards when gussets formed in the opposite sides of the tube of blown film are not needed.

Abstract: A safety cover is provided for a cutter head or punch head of the type used in making holes and slits in plastic film, so that the punch head may be transported, stored, installed or removed without exposing the sharp cutting blades to an operator's hands. The safety cover may be of a box-like construction with a generally keyhole-shaped opening formed on its upper wall. The keyhole opening has a wider portion open to the distal or machine side, a narrow slot portion, and a round portion that accommodates the round punch blade of the punch head.

Abstract: A safety cover is provided for a cutter head or punch head of the type used in making holes and slits in plastic film, so that the punch head may be transported, stored, installed or removed without exposing the sharp cutting blades to an operator's hands. The safety cover may be of a box-like construction with a generally keyhole-shaped opening formed on its upper wall. The keyhole opening has a wider portion open to the distal or machine side, a narrow slot portion, and a round portion that accommodates the round punch blade of the punch head.

Abstract: An idler roll employed in a blown film extrusion line is non turning and a plurality of wear strips are removably attached to the idler roll at circumferentially spaced positions around the idler roll. The wear strips engage blown film passing over the idler roll. The wear strips have reduced coefficients of friction than that of the idler roll, have high wear resistances and the blown film passing over the wear strips cleans and polishes the surface area of the wear strips the film moves across, substantially making the wear strips and the non turning idler roll maintenance free compared with idler rollers with bearings.

Abstract: Gusset boards of a blown film extrusion apparatus have nose portions that can be positioned in the path of a tube of blown film traveling between the nose portions where the nose portions engage with opposite sides of the tube of blown film and form gussets in the tube of blown film. The nose portions of the gusset boards can also reduce their width dimensions which enables the nose portions to be moved away from the path of blown film traveling between the gusset boards when gussets formed in the opposite sides of the tube of blown film are not needed.

Abstract: An idler roll employed in a blown film extrusion line is non turning and a plurality of wear strips are removably attached to the idler roll at circumferentially spaced positions around the idler roll. The wear strips engage blown film passing over the idler roll. The wear strips have reduced coefficients of friction than that of the idler roll, have high wear resistances and the blown film passing over the wear strips cleans and polishes the surface area of the wear strips the film moves across, substantially making the wear strips and the non turning idler roll maintenance free compared with idler rollers with bearings.