A calibration cage for the production of a blown film is provided. It has a supporting structure and a plurality of frames rotatable in the horizontal plane which are pivoted along the perimeter of the supporting structure at the vertices of a regular polygon, each frame carrying a vertical rod rotatable with respect thereto which in turn carries at least one element for guiding a blown film, each vertical rod being connected to the vertical rods adjacent thereto through connection elements that are rigid in the horizontal plane yet have a length variable in the plane, each connection element being pivoted between two horizontal pivots each of which forms with a vertical radial plane having the axis of rotation of the respective vertical rod an angle that is equal to half of the internal angle () of the regular polygon.

A calibration device for calibrating a film hose produced via a blow-extrusion film device, by which the film hose can be brought into a desired diameter, has at least one film guiding element, by which the film hose can be guided. The film guiding element includes at least one elastically deformable element.

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.

A seal for use in an extrusion device for producing continuous profiles, in particular plastics pipes includes an elastic sealing disc, which is arranged in a plane approximately perpendicularly to the extrusion direction and has a through-passage opening letting through the continuous profile and having a sealing rim bearing against the continuous profile. Connection members are arranged along the sealing rim, and clamping elements are provided for exerting a force on the connection members, with the force acting radially with respect to the extrusion axis. The clamping elements are arranged in a plane parallel to the sealing disc, have a passage opening for the continuous profile and include connecting members for connecting the connection members to the clamping elements.

A device for sizing and cooling an extruded flat product made of plastic material includes at least two main rolls and a polishing stack including a plurality of rolls arranged in tandem and disposed downstream of the main rolls. An adjustable sizing nip is disposed between all of the adjacent respective rolls. The sizing nip is adjustable so as to pinch the flat product during an extrusion process to a greater or a lesser extent.

A method for post-tempering a film tube extruded by a blown film line includes: ejecting the film tube in a haul-off direction along a longitudinal axis of the blown film line by a blow head; blowing cooling gas onto the film tube relative to the haul-off direction downstream of the blow head to solidify the film tube at a frost line; post-tempering the film tube by a post-tempering unit having a plurality of adjustable blowing elements downstream of the frost line for blowing tempering gas onto the film tube; adapting a diameter of a feed-through opening formed by the blowing elements to a diameter of the film tube by adjusting the blowing elements; measuring the actual temperature of the film tube downstream of at least one of the blowing elements; and regulating the temperature of the film tube to a target temperature by blowing tempering gas onto the film tube.

A tempering device for tempering a film tube extruded in a haul-off direction above a frost line includes: several guide segments distributed around a longitudinal axis parallel to the haul-off direction of the film tube and forming a central guide opening for guiding the film tube along the longitudinal axis, the guide segments being adjustable transversely to the longitudinal axis for adjusting the diameter of the guide opening; a guide roller for each guide segment, the guide roller being adjustable together with the guide segment and configured to guide the extruded film tube; and a nozzle section associated with the guide roller, which is adjustable together with the guide segment. The nozzle section has a blow-out nozzle for blowing out a tempering gas in the direction towards the longitudinal axis. The nozzle section is arranged relative to the longitudinal axis in at least partial radial overlap with the guide roller.

A method of injecting a colorant into an extruded material and an artificial wood plank formed from said method. The method includes steps of extruding the material from an extruder to at least one die, shaping the material into a board via the at least one die, injecting the colorant into the material with at least one color injector in a pre-defined pattern, and forming a bubble in the material to impart a simulated woodgrain appearance into the material downstream of the at least one die.