An extruder screw for plasticizing at least one plastic or plastic mixture, including a melting zone, a shaft zone and a mixing zone arranged between the melting zone and the shaft zone, wherein a conveying flight is formed in the melting zone and in the shaft zone, which extends helically along a longitudinal axis of the screw, wherein a conveying flight of the melting zone ends at an end of the melting zone towards the mixing zone and a conveying flight of the shaft zone begins at an end towards the mixing zone. A flight depth of the melting zone continuously decreases along the longitudinal axis of the screw to the mixing zone. Further, an extrusion device having the extruder screw and to a method for plasticizing at least one plastic or plastic mixture.

A screw with a spiral blade for extruding a plastic elastomer while kneading the plastic elastomer, the screw includes a kneading region where the spiral blade is provided with cutout portions being configured to pass pins, and a plasticizing region being arranged on a downstream side in an extrusion direction of the kneading region. The plasticizing region includes a barrier extending between portions adjacently in the extrusion direction of the spiral blade.

A screw with a spiral blade for extruding a plastic elastomer while kneading the plastic elastomer, the screw includes a kneading region where the spiral blade is provided with cutout portions being configured to pass pins, and a plasticizing region being arranged on a downstream side in an extrusion direction of the kneading region. The plasticizing region includes a barrier extending between portions adjacently in the extrusion direction of the spiral blade.

A film that comprises a thermoplastic composition that contains a continuous phase that includes a polyolefin matrix polymer and a nanoinclusion additive dispersed within the continuous phase in the form of discrete domains is provided. The film is biaxially stretched in a machine direction and cross-machine direction to form a porous network in the composition. The porous network contains nanopores having a maximum cross-sectional dimension of about 800 nanometers or less. At least a portion of the nanopores are oriented in the cross-machine direction so that the axial dimension generally extends in the cross-machine direction and the cross-sectional dimension generally extends in the machine direction.

A film that comprises a thermoplastic composition that contains a continuous phase that includes a polyolefin matrix polymer and a nanoinclusion additive dispersed within the continuous phase in the form of discrete domains is provided. The film is biaxially stretched in a machine direction and cross-machine direction to form a porous network in the composition. The porous network contains nanopores having a maximum cross-sectional dimension of about 800 nanometers or less. At least a portion of the nanopores are oriented in the cross-machine direction so that the axial dimension generally extends in the cross-machine direction and the cross-sectional dimension generally extends in the machine direction.

Device and method for dispersing solids, liquids and gases in an extruder, having at least one shaft (1) and one housing (2), wherein at least one disk (4) with recesses is attached to the shaft, which at least one disk co-rotates with the shaft, and a non-co-rotating disk (3) is arranged immediately adjacent to the disk either in a product flow direction or counter to the product flow direction, which non-co-rotating disk likewise has recesses, and wherein the co-rotating disk is connected to the rotating shaft and has a gap (14) with respect to the housing, and the non-co-rotating disk is connected to the housing and has a gap (15) with respect to the rotating core shaft.

Device and method for dispersing solids, liquids and gases in an extruder, having at least one shaft (1) and one housing (2), wherein at least one disk (4) with recesses is attached to the shaft, which at least one disk co-rotates with the shaft, and a non-co-rotating disk (3) is arranged immediately adjacent to the disk either in a product flow direction or counter to the product flow direction, which non-co-rotating disk likewise has recesses, and wherein the co-rotating disk is connected to the rotating shaft and has a gap (14) with respect to the housing, and the non-co-rotating disk is connected to the housing and has a gap (15) with respect to the rotating core shaft.

The devices relate to the nuclear, metallurgical, mining, machine-building and food industries and may be used in producing semi-finished products and items made via the extrusion of powders of composite, polymer and other plastic masses. A device for producing semi-finished products or items made of composite, or polymer, or plasticized powder materials includes a screw press with a housing and a screw within the housing. The housing and the screw each have at least one deformational portion with protrusions and may each be formed integrally with the protrusions or may be formed compositionally, having special insertable rings which are provided with protrusions. In carrying out all three device variants, the housing and the screw are formed compositionally, and have provided, on the deformational portions of a ring, stators, which are secured to neighboring portions of the housing, and rotors, which are secured to neighboring portions of the screw.

The devices relate to the nuclear, metallurgical, mining, machine-building and food industries and may be used in producing semi-finished products and items made via the extrusion of powders of composite, polymer and other plastic masses. A device for producing semi-finished products or items made of composite, or polymer, or plasticized powder materials includes a screw press with a housing and a screw within the housing. The housing and the screw each have at least one deformational portion with protrusions and may each be formed integrally with the protrusions or may be formed compositionally, having special insertable rings which are provided with protrusions. In carrying out all three device variants, the housing and the screw are formed compositionally, and have provided, on the deformational portions of a ring, stators, which are secured to neighboring portions of the housing, and rotors, which are secured to neighboring portions of the screw.

Systems and methods are provided for fabrication of short-fiber composites. One embodiment is a method for forming a short-fiber composite. The method includes forming a bed of randomly oriented dry fibers on a base, drawing resin into the bed in response to pressure to form a mixture of randomly oriented fibers impregnated with thermoset resin, perturbing the mixture while preserving fiber length at the mixture and degassing the mixture, and extruding the mixture to form a preform.