A method of fabricating a gas separation membrane includes providing a coextruded multilayer film that includes a first polymer layer formed of a first polymer material and a second polymer layer formed of a second polymer material, the first polymer material having a first gas permeability. The coextruded multilayer film is axially oriented such that the second polymer layer has a second gas permeability that is greater than the first gas permeability.

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.

A polyetheretherketone pipe of length greater than 250 meters and a residual stress of less than 5 MPa may be made using a calibrator device 2 which includes a cone shaped opening 6 arranged to receive a molten extruded pipe shaped polymer. Attached to the front member 4 is a vacuum plate 14a and successive vacuum plates 14b-14h are attached to one another to define an array of vacuum plates, the vacuum plates being arranged to allow a vacuum to be applied to a pipe precursor passing through opening 16. The vacuum plates 14 also include temperature control means for heating or cooling the plates and therefore heating or cooling a pipe precursor passing through the openings. With a vacuum applied to opening 6, 16 and heating/cooling the plates, an extruded hot plastics pipe is inserted into calibrator 2 via opening 6 and conveyed through opening 16 in plates 14, whereupon it is urged by the vacuum against the cylindrical surface defined by plates 14 to maintain its shape and the temperature of each plate is controlled to control the rate of cooling of the pipe precursor passing through. The pipe may be cooled at a relatively slow rate so that a pipe made from a relatively fast crystallising polymer crystalises and the crystallinity of the pipe along its extent and throughout its thickness is substantially constant.

A decking plank includes a non-distressed surface with a first surface texture defining a plurality of wood grain depressions. The plank also includes a distressed surface with a second surface texture defining a plurality of wood grain depressions and a plurality of cross-grain depressions. An outdoor deck may be formed with the dual-sided deck planks. The deck may be constructed in one configuration where each of the dual-sided deck planks has the distressed surface facing upward and exposed. The deck may be constructed in a second configuration where the same planks are assembled to have the non-distressed surface facing upward and exposed.

A weatherable, low heat build-up capstock system comprising an acrylic cap, a pigment system that is IR transparent to a greater degree than existing pigment systems, an IR reflective substrate, and an extrusion system for same.

A weatherable, low heat build-up capstock system comprising an acrylic cap, a pigment system that is IR transparent to a greater degree than existing pigment systems, an IR reflective substrate, and an extrusion system for same.

A sizer for cooling an extrudate includes a core and a housing. The core includes an extrusion channel which accommodates the extrudate, a core cooling channel, and a core vacuum channel in fluid communication with said extrusion channel. The housing includes a housing cooling channel, a housing vacuum channel, a cooling intake, and a cooling exhaust. The housing cooling and vacuum channels having curved segments. The cooling intake and exhaust being in fluid communication with said housing cooling channel.

A fin block is provided for a calibrating device for calibrating an extruded profile, wherein the fin block includes a fin structure, which has a plurality of fins. The fins are spaced apart from one another by grooves and are arranged in longitudinal direction (L) of the fin block. The fin block has at least one channel for feeding a temperature-control fluid, wherein the at least one channel is formed in an integrated manner in the fin block. Furthermore, a method is provided for the production of the above-mentioned fin block, and a calibrating device which includes a plurality of the above-mentioned fin blocks. Furthermore, a system for the additive manufacture of the above-mentioned fin block, a corresponding computer program and a corresponding data set is provided.

A lamella block is provided for a calibrating device for calibrating an extruded profile, wherein the lamella block includes a lamella structure, which has a plurality of lamellae that are spaced apart from each other by grooves and arranged in the longitudinal direction of the lamella block. The lamella structure has a variably designed division in the longitudinal direction of the lamella block. Further provided is a method for manufacturing the aforementioned lamella block, as well as a calibrating device, which includes a plurality of the lamella blocks mentioned above. Also provided is a system for additively fabricating the lamella blocks mentioned above, a corresponding computer program and a corresponding dataset.

A lamella block for a calibration device for the calibration of an extruded profile, wherein the lamella block includes a lamella structure having a plurality of lamellae, which are spaced apart from one another by grooves and arranged in the longitudinal direction of the lamella block. At least some of the lamellae are provided with at least one lamella opening with a predefined variable geometry. The application also relates to a method for producing said lamella. block, as well as a calibration device comprising a plurality of said lamella blocks. The application further relates to a system for additively manufacturing said lamella block, a corresponding computer program and corresponding data set.