An extruder mixer and extruder mixer section are provided. The extruder mixer section includes inlet and outlet channels and an intermediate channel separated by pumps and bound by a flight portion. Also provided are methods of mixing polymers with the extruder mixer section. An extrusion system using the extruder mixer section is also provided.

A flexible, wearable apparatus comprising a flexible display, a support member and a retainer. In some embodiments, the flexible, wearable apparatus can be used in a flat or rounded configuration. In some embodiments, the flexible support member is formed to provide a substantially planar viewing surface for the electrophoretic display when the flexible, wearable apparatus is in a rounded state.

An extruder is disclosed, and more particularly, to an integrated single screw extruder and a twin screw extruder for mixing, compounding, kneading and/or extruding of materials. The integrated extruder includes a first barrel assembly and a second barrel assembly. The integrated extruder further includes a first screw having a first threaded portion and a second threaded portion. The first threaded portion is housed within the first barrel assembly and is configured to provide upstream material processing. The second threaded portion is housed within the second barrel assembly and is configured to provide downstream material processing. The integrated extruder further includes a second screw having a non-threaded shaft portion and a threaded portion. The threaded portion of the second screw is housed within the second barrel assembly and is configured to provide the downstream material processing with the second threaded portion of the first screw.

A method for the improved extrusion of polyethylene polymers comprising passing polyethylene through a single stage, twin screw extruder comprising a solid polymer conveying zone, a polymer melting zone, a dispersive mixing zone, and a distributive mixing/pumping zone, in which the throughput and screw speed are optimized to reduce the number of gels present, ensure complete polymer melting within the polymer melting zone, and to minimize polymer degradation.

A method and a device for admixing additives into a polymer melt made of non-extracted polyamide 6 are disclosed. The polymer melt is combined in a highly concentrated form with an additional melt flow without additives and mixed therewith. Additionally, a part of the melt is branched off from a main melt flow (3), wherein the sub-melt flow (4) is transported into a dispersing device (5) and is supplied and mixed with one or more additives (12). The side-melt flow (4) with additives is then returned into the main melt flow (3), mixed with the main melt flow, and subsequently supplied for further processing.

A process for preparing a thermoplastic polymer composition or a thermoplastic polymer blend, comprising: from 20 to 80% by weight of at least one water-moist elastomer component A containing up to 40%, preferably up to 30% by weight of residual water, from 20 to 80% by weight of at least one thermoplastic polymer B, from 0 to 40% by weight of at least one further polymer C, and from 0 to 60% by weight of additive(s) D, by mixing the elastomer component A with the thermoplastic polymer B and, if present, the further polymer C and, if present, the additive(s) D in an extruder, comprising the steps of precipitating the elastomer component A, and mechanical dewatering of the elastomer component A leads to improved salt-free products.

A foamable composition comprising at least one cellulose acetate, a plasticizer, a nucleating agent, either a chemical blowing agent or a physical blowing agent, and natural fibers is disclosed. The foamable composition is melt-processable, thermoformable, and biodegradable. The composition is formed into foamed articles that are biodegradable.

A foamable composition comprising at least one cellulose acetate, a plasticizer, a nucleating agent, either a chemical blowing agent or a physical blowing agent, and natural fibers is disclosed. The foamable composition is melt-processable, thermoformable, and biodegradable. The composition is formed into foamed articles that are biodegradable.

A mixing section for an extrusion screw comprises a shaft having at least one set of spaced-apart cuspidate shaft teeth, with the shaft teeth extending radially outwardly from a root of the shaft. Each of the shaft teeth comprises a flank face and a rake face opposite the flank face, with the tooth transitioning between the flank face and the rake face at an outermost cusp. Some embodiments have one or more longitudinally extending, longitudinally spaced series of annular sets of circumferentially spaced shaft teeth. Some embodiments have one or more helically extending series of spaced-apart cuspidate shaft teeth. The mixing section may be received in a mixing section barrel to form a mixing portion of a screw extruder.

An mixing section for an extrusion screw has an inlet end and an outlet end as well as alternating wiping lands and barrier lands. The wiping lands have a greater helix angle than the barrier lands. The wiping lands and the barrier lands define inlet channels which narrow toward the outlet end and outlet channels which widen toward the outlet end. A helical pattern of mixing channels is cut into the wiping lands and the barrier lands. The mixing channels may be oriented generally at approximately right angles to the wiping lands and the barrier lands. A portion of the extrudate encounters the inside wall surfaces of the mixing channels and changes direction which improves the mixing of the extrudate.