A method for forming a multilayer plastic sheet material (1) for floor and/or wall panels, wherein a first polymer mass comprising a rigid PVC is melted under pressure and is passed through an extruder head at a specified discharge rate in the form of a plastic strand in sheet form that is provided with one or more layers so that a multilayer plastic strand is formed, which is passed to two or more rolls of a finishing stand, which processes the multilayer plastic strand into a sheet of defined thickness, which is then led away via a transport device to a sawing device to be cut to the desired length, wherein, after the plastic strand in sheet form leaves the extruder head, it is first passed between a top roll and a bottom roll of a roughing stand, wherein the speed of the rolls of the finishing stand and the rolls of the roughing stand is synchronized with the discharge rate of the plastic strand in sheet form from the extruder head, so that said plastic strand is processed without stress.

A method for the active adjustment of the profile of a film produced with blown extrusion technology, a film obtained with such method and a reel resulting from the winding of the film.

An apparatus is intended to produce a multi-layer extrudate comprising an intermediate material interposed between at least two layers of outer material. The apparatus comprises an arrangement of ducts which includes a first duct and a second duct through which respective lateral flows of outer material can flow. The arrangement of ducts also includes a further duct through which a central flow comprising at least the intermediate material can flow. The apparatus further comprises at least one obstructing element for interacting at least with the central flow while the central flow is advancing in an advancement direction. The at least one obstructing element is movable with a movement having a component directed transversally to the advancement direction, so as to obstruct the central flow in the advancement direction at preset intervals.

Described is a system for transferring a dose of polymeric material comprising a head for supplying the polymeric material and at least one conveying device, provided with a conveying wall, which is configured for advancing along a path through the supplying head for transferring to the conveying wall a dose obtained from the polymeric material supplied from the supplying head; and wherein the supplying head comprises a duct which is provided with a straight outfeed region extending along an axis which is configured to supply the polymeric material to a supplying outfeed. The outfeed region comprises at least a first zone and a second zone facing each other, the supplying head having at least one variation configuration in which the first zone and the second zone are asymmetrical to disturb a flow of polymeric material in the outfeed region in such a way as to control the supplying direction of the polymeric material, supplied from the supplying outfeed and to transfer to the conveying wall. A method is also proposed for transferring the dose of polymeric material from the supplying head to the conveying device and a method for supplying the dose.

Disclosed is an apparatus for the production of a blown tubular film (FT). The apparatus includes an independent device for the localized thickness adjustment at the strips adjacent to the folding edges resulting from the flattening of the tubular film (FT) by means of adjustment elements formed in angular sectors of limited extension symmetrically arranged 180° apart. The independent device for the localized thickness adjustment being a volumetric type device having a rotating ring that performs a rotating adjustment of the flow rate of a cooling air stream which takes into account the angular offset resulting from the operational parameters of the apparatus.

A cooling apparatus for an extruder includes a supply line configured to receive bulk coolant from a supply circuit via an inlet. The supply line delivers supply coolant to the extruder along a flow path. A return line communicates expelled coolant from the extruder, and a circulation line connects the supply line to the return line. The circulation line supplies a recirculated portion of the expelled coolant to the supply line and mixes the bulk coolant with the recirculated portion of the expelled coolant forming the supply coolant. A bypass line connects the supply line to the return line, and a flow control valve connects one of the supply line and the return line to the bypass line. A proportion of the expelled coolant to the bulk coolant forming the supply coolant is adjusted by the flow control valve to control the temperature of the supply coolant.

Methods for startup of an extruder include (a) initiating feed of a polymer resin to the extruder using a volumetric feeder such that, where the melt index of the polymer resin is less than 10 g/10 min (ASTM D1238 at 230° C., 2.16 kg), the volumetric feeder is operated at a first volumetric feeder speed; or (b) initiating feed of a polymer resin to the extruder using the volumetric feeder such that, where the melt index of the polymer resin is 10 g/10 min or greater, the volumetric feeder is operated at a second volumetric feeder speed greater than the first. The first volumetric feeder speed can range from about 20% to about 25% of the volumetric feeder max speed; and the second volumetric feeder speed can range from about 30% to about 35% of the volumetric feeder max speed.

The present disclosure relates to systems and methods relating to the application of composite radius filler materials. An example material feed system includes a material container configured to contain a composite material and a material feed actuator. The material feed system also includes a nozzle coupled to the material container and a workpiece sensor configured to provide information about a workpiece. The material feed system also includes a controller. The controller is configured to receive, from the workpiece sensor, workpiece information. The workpiece information is indicative of at least one surface of the workpiece. The controller is also configured to, based on the workpiece information, cause the material feed actuator to apply a force to the composite material contained in the material container so as to extrude at least a portion of the composite material out of the nozzle and onto a surface of the workpiece.

Extrusion techniques for reducing bow of an extrudate formed from a ceramic forming mixture. Velocities of an outer surface of the extrudate are measured at a plurality of peripherally spaced measurement locations. The velocities are compared to determine whether there is a velocity bias, and the comparison is used to selectively alter the flow of the ceramic forming mixture.

The following is provided as a member for a composite material that has excellent durability, impact resistance, and productivity. A member for a composite material containing a resin component that contains polyaryletherketone as a main component. The resin component has a molecular weight distribution of 2 or more and less than 4 and a mass average molecular weight of 63000 or more. The composite material contains a resin and reinforcing fibers having a number average fiber length of 5 mm or more.