Injection apparatus for injecting a liquid formulation into a molten polymer at high pressure includes a reservoir containing liquid formulation at ambient temperature and pressure which is arrange to flood-feed pump body 26 of a first progressing cavity pump (pcp) (4). The first pcp (4) is driven by motor (6) and is arranged to accurately meter the liquid formulation into a second pcp (8) which is downstream of the first pcp and is arranged to increase the pressure of the liquid formulation by 200 bar or more. Downstream of pump (8) is a delivery valve (14) arranged to control passage of liquid formulation, via outlet (17), into pressurised molten polymer stream (75) which is present in an extruder (77).

A process is disclosed to recycle and/or formulate expandable plastic materials using a system (1) comprising: an extruder unit (10), a mixer-heat exchanger unit (20), said process comprising the steps of: melting in the extruder unit (10), cooling in the mixer-heat exchanger unit (20), and controlling the melt pressure by means of a melt pump unit (50), followed by granulation, extrusion, or injection molding, wherein a first expansion agent (81) is not degassed during a melt processing in the system (1) such that it is substantially contained in the granulated expandable plastic material (130) or used to form either the extruded, formed and expanded plastic material (140) or the molded expanded plastic article (150). The present invention also relates to a granulated expandable plastic material (130), an extruded, formed and expanded plastic material (140), and a molded expanded plastic article (150) obtainable by said process.

Provided are a quality inspection method and a quality inspection system for unvulcanized rubber material. A final dielectric constant measurement device detects the dielectric constant of a final rubber material in which a compounding agent of predetermined type is mixed with unvulcanized rubber, and a calculator calculates a compounding ratio of the compounding agent to the final rubber material based on the detected dielectric constant, determines whether or not the calculated compounding ratio is in a preset compounding reference range, displays a determination result on a monitor, and adjusts a ratio of the compounding agent fed into an extruder to the unvulcanized rubber such that the calculated compounding ratio is within the compounding reference range.

Liquid mixing processes are provided for producing an elastomeric composition as a function of a selected elastomeric composition recipe. A system (10) is also provided for the production of an elastomeric composition according to the disclosed liquid mixing processes.

An installation for manufacturing cross-linkable polyethylene compounds which comprises a melting machine (101), a melt pump (102) and a filtration unit (103) to produce cross-linkable polyethylene compounds that may be further used for manufacturing insulating parts of medium, high and extra-high voltage power cables, and a method for manufacturing such cross-linkable polyethylene compounds.

A method of manufacturing bulked continuous carpet filament which, in various embodiments, comprises: (A) grinding recycled PET bottles into a group of flakes; (B) washing the flakes; (C) identifying and removing impurities, including impure flakes, from the group of flakes; (D) adding one or more color concentrates to the flakes; (E) passing the group of flakes through an extrusion system while maintaining the pressure within the extrusion system below about 25 millibars; (F) passing the resulting polymer melt through at least one filter having a micron rating of less than about 50 microns; and (G) forming the recycled polymer into bulked continuous carpet filament that consists essentially of recycled PET.

A device includes a source for at least one liquid plastic component, and a metering device. The source is configured to intermittently supply the at least one liquid plastic component for the metering device. A buffer device with a variable buffer volume is between the source and the metering device, and the buffer device is connected to the source via an inlet opening and to the metering device via an outlet opening.

The present invention relates to a method for transporting polyolefin particles in a polymer conveying system, comprising the steps of a) Subjecting the polyolefin particles to moist conveying gas to produce wetted polyolefin particles; b) Transporting the wetted polyolefin particles through at least one conveying line; and c) Controlling the amount of moisture in the conveying gas of the polymer conveying system as such that at the end point of the at least one conveying line the relative humidity of the conveying gas (RH.sub.CG) is 40% to 100%, the use of said method in an in-plant polymer conveying system, the use of said method for improving dust and/or angel hair removal in polymer conveying systems and the use of said method for increasing conveying capacity of polyolefin particles with a density of from less than 850 to 910 kg/m.sup.3.

A conveyance unit mounted to a machine for initial processing of natural raw rubber into aged rubber product, includes: a discharge delivery belt connected with the machine to receive the aged rubber product; a vibration delivery device connected to the discharge delivery belt to selectively delivery the aged rubber product from the discharge delivery belt; a drying and cooling device, comprising an elongated channel body and a circulation system mounted therein, wherein the rubber product is entered from one end of the elongated channel body while being dewatered and left from the other end of the elongated channel body, wherein the circulation system is operated to provide wind inside the elongated channel body for drying and cooling the rubber product; and a cutting device connected to the elongated channel body of the drying and cooling device to cut the dried rubber product into aged product.

An extrusion device comprises at least one supply station suitable for containing a material to be extruded; a plurality of propellers operatively connected to at least one supply station for receiving the material to be extruded and at least one extrusion head connected to at least one propeller. Each propeller can also be selectively activated to modulate an extrusion speed and/or a quantity of material to be extruded as an output from the extrusion head.