The invention relates to a process for removal of volatile components from an olefin polymer, the process carried out in an extruder comprising at least one vacuum degassing zone, said process comprising the steps of: (a) introducing a stream of an olefin polymer into the extruder; (b) extruding the olefin polymer in the extruder at a temperature which is higher than the melting temperature of the olefin polymer but lower than the decomposition temperature of the olefin polymer, thereby producing an olefin polymer melt having reduced amount of volatile components, wherein the process in the extruder has a residence time distribution broadness (σ2) in the range of 800 to 4000 as define by equation (1) wherein: σ2 is the residence time distribution broadness, T is the mean residence time, t is the interval of residence time a fluid element of the olefin polymer spends in the extruder, E(t) is the residence time distribution function, and wherein the process optionally comprises a step (c) where the melt of the olefin polymer is passed through a die zone to a pelletizer for pelletizing the obtained olefin polymer.
σ.sup.2=∫.sub.0.sup.∞(t−τ).sup.2E(t)dt  equation (1)

A screw includes a screw main body, a conveyance portion conveying a raw material, and a passage provided in the screw main body. The passage includes a first passage element, a second passage element, and a third passage element. The screw main body has a plurality of cylindrical bodies arranged in an axial direction of the rotating shaft. At least a portion of the conveyance portion is formed on outer peripheral surfaces of the cylindrical bodies adjacent to each other, and the passage is formed in the cylindrical body so as to cross over between the adjacent cylindrical bodies.

The present invention provides a process for preparing an improved compounded product and a compounded product prepared by that process.

Methods and an apparatus are presented. A bulk molding compound is consolidated by sending the bulk molding compound through a die breaker and an extrusion die of a consolidation system.

A latex processing system and method involves mixing a latex and at least one solvent blend in an extruder, in order to remove resin found in the latex and to coagulate the latex to form a coagulum. The at least one solvent blend has a first solvent configured to coagulate the latex, and a second solvent configured to swell the resulting coagulum. In particular, a series of the solvent blends may be used at different locations along a length of the extruder, and may further include distinct blends of the first solvent and the second solvent, introduced at the different locations, and having different ratios of the first solvent and the second solvent.

An extruder screw includes a screw body. The screw body is rotated about an axis parallel to a direction of conveyance of a raw material. A conveyance portion having a flight is provided on the outer peripheral surface of the screw body. The flight is configured to convey the raw material along the axis of the screw body when the screw body is rotated. A passage for permitting the raw material fed by the flight to pass therethrough to the outer peripheral surface of the screw body is provided in the screw body in a position deviated from the axis of the screw body.

A method of melt blending a polypropylene and the melt blended polypropylene therefrom, comprising providing a base-polypropylene having a MFR of less than 15 g/10 min and a molecular weight distribution (Mw/Mn) within the range from 5 to 16, and comprising hindered phenol and phosphorous-type antioxidants, and within the range from 5 ppm to 4000 ppm of an alkyl radical scavenger relative to the total weight of the components to form a melt blended polypropylene; melt blending the melt blended polypropylene at a temperature of at least 210° C.; and isolating a melt blended, melt blended polypropylene.

A method of melt blending a polypropylene and the melt blended polypropylene therefrom, comprising providing a base-polypropylene having a MFR of less than 15 g/10 min and a molecular weight distribution (Mw/Mn) within the range from 5 to 16, and comprising hindered phenol and phosphorous-type antioxidants, and within the range from 5 ppm to 4000 ppm of an alkyl radical scavenger relative to the total weight of the components to form a melt blended polypropylene; melt blending the melt blended polypropylene at a temperature of at least 210° C.; and isolating a melt blended, melt blended polypropylene.

An extruder includes a screw for extruder provided with a screw element for kneading a raw material, and a barrel including a cylinder portion in which the screw is inserted so as to be rotatable. A plurality of screw elements identical with the screw element are provided in a longitudinal direction of the screw under a certain rule. The barrel is integrated by combining a plurality of barrel blocks blocked. Each of the plurality of barrel blocks is configured in accordance with a length of the screw element provided in the longitudinal direction of the screw.

An extruder includes a screw for extruder provided with a screw element for kneading a raw material, and a barrel including a cylinder portion in which the screw is inserted so as to be rotatable. A plurality of screw elements identical with the screw element are provided in a longitudinal direction of the screw under a certain rule. The barrel is integrated by combining a plurality of barrel blocks blocked. Each of the plurality of barrel blocks is configured in accordance with a length of the screw element provided in the longitudinal direction of the screw.