A system and method for forming fluted polymer boards and recycling scrap material. A feeder feeds polymer to an extruder, which extrudes fluted board stock from the polymer. A scrap portion of the board stock is separated from another portion that comes to form the boards. The recycling system returns the separated scrap portion along a return path to the feeder and forms holes in the scrap portion creating fluid communication between the flutes and atmosphere before the scrap portion is returned to the feeder. The scrap portion can, in some embodiments, be ground into granular form after being hole-punched without creating a pressure condition in the flutes that adversely affects extrusion of the board stock.

A composite polystyrene profile extending longitudinally from a first end to a second end and comprising a front surface and a back surface, comprising a. a core portion comprising a polystyrene monopolymer foam extending in the longitudinal direction, the core portion comprising polystyrene foam with a density of the range of 160 kg/m.sup.3 to 240 kg/m.sup.3.; and b. a skin portion or layer comprising/consisting of a (high impact) polystyrene copolymer and surrounding the core portion at least in the longitudinal direction, with a density in the range of 700 kg/m.sup.3 to 1300 kg/m.sup.3.; wherein the polystyrene profile comprises a combined density within the range of 200 to 360 kg/m.sup.3.; and the skin portion comprises a non-uniform thickness in a transversal direction perpendicular to the longitudinal direction; and associated method of manufacturing these profiles.

A method of forming an extrusion bubble in an extruded material. The method includes steps of extruding the material from an extruder to at least one die, expanding a first portion of the material along the at least one die, expanding a second portion of the material along a calibrator, and forming a bubble in the material between the at least one die and the calibrator to impart a simulated woodgrain appearance into the material. The method may further include a step of defining an extrusion gap between the at least one die and the calibrator; wherein the bubble is formed inside of the extrusion gap.

A shaping roll for melt extrusion molding used for melt extrusion molding of thermoplastic resin, the shaping roll for melt extrusion molding comprises a metal roll body, a first cylinder, and a second cylinder. The metal roll body has a heat medium passage internally. The first cylinder covers a surface of a middle portion of the roll body part. The second cylinder covers surfaces of both end portions of the roll body part. The first cylinder comprises a first metal material having a thermal conductivity of 40 W/m.Math.K or more. The second cylinder comprises a second metal material having a thermal conductivity of 20 W/m.Math.K or less. The first cylinder and the second cylinder are at least partially joined to each other.

A method and assembly for reshaping an elongated plasticized article including a pair of first and second spaced apart fixtures adapted to supporting extending ends of an elongated article. The fixtures each exhibit a contoured upper surface upon which the elongated article is adapted to being supported in adhering fashion. A heated airflow is delivered in communication with at least one surface of the article and, upon cooling, the article exhibits an extending profile matching the contoured upper surface. A pre-heat station pre-softens at least an extending subset portion of the article prior to transfer to the fixture. Pluralities of gripping fingers communicate with an underside of the contoured upper surface and are adapted to engage at least underside accessible cross sectional profile locations of the article.

The invention relates to a heat exchanger tube (1) which is a component of a heat exchanger of an oxygenator. The heat exchanger tube (1) comprises a tube body (2) consisting of thermoplastic polyurethane (PTU). The tube body (2) has a Shore hardness of greater than 60 D. This results in a heat exchanger tube optimised for use in a heat exchanger of an oxygenator.

In an embodiment, the present invention provides a method for increasing the cooling performance of an extrusion line and for extruding a plastics profile, in particular a plastics tube, in an energy efficient manner, the method including the steps of: melting plastics material in an extruder; shaping a plastics strand and feeding the plastics strand to a die; shaping a plastics profile using the die; and calibrating and curing by cooling the profile in a cooling and/or calibration device, a gaseous medium being drawn through one or more cooling tanks in order to cool the outside of the profile. A temperature and a saturation of the gaseous medium is increased between an inlet region and an outlet region for the gaseous medium. A liquid medium is added between the inlet region and the outlet region using spray nozzles.

A method for measuring a tubular strand exiting from an extrusion device comprises directing electromagnetic radiation from an inside of the tubular strand to an inner side of a tubular strand. The electromagnet radiation is radiated from at least one radiation source within a frequency range from 1 GHz to 6000 GHz. The electromagnetic radiation is reflected off of the tubular strand and received by at least one radiation receiver. A value for at least one of a diameter, a wall thickness, and a deviation in shape of the tubular strand is determined from the electromagnetic radiation received by at least one radiation receiver.

A method for measuring a tubular strand exiting from an extrusion device comprises directing electromagnetic radiation from an inside of the tubular strand to an inner side of a tubular strand. The electromagnet radiation is radiated from at least one radiation source within a frequency range from 1 GHz to 6000 GHz. The electromagnetic radiation is reflected off of the tubular strand and received by at least one radiation receiver. A value for at least one of a diameter, a wall thickness, and a deviation in shape of the tubular strand is determined from the electromagnetic radiation received by at least one radiation receiver.

A device for measuring a strand that is tubular includes a first radiation source to emit terahertz radiation in a first measurement region from an inside onto an inner surface of the strand. A first radiation receiver receives terahertz radiation reflected by the strand in a second measurement region. A first evaluation apparatus determines at least one geometric parameter of the strand in the first measurement region. A second radiation source emits terahertz radiation in the second measurement region from an outside onto an outer surface of the strand. A second radiation receiver receives terahertz radiation reflected by the strand in the second measurement region. A second evaluation apparatus determines at least one geometric parameter of the strand in the second measurement region. A third evaluation apparatus determines a change in the at least one geometric parameter of the strand between the first and second measurement regions.