Mixing device (1) for dispensing a multi-component polymeric mixture, comprising a main body (2) comprising a mixing chamber (3) for mixing a first and a second component of the mixture, the mixing chamber having a main development along a longitudinal direction (100) and comprising a respective longitudinal open end (4); a movable body (5) having a central axis (101) with longitudinal development and slidably housed in the main body (2) to alternatively assume, by sliding along the longitudinal direction (100), an occlusion position of the mixing chamber (3) and a mixing position, wherein the movable body (5) comprises a first channel (6) and a second channel (7) each comprising a respective end portion (20) both displaced from the central axis (101) of the movable body (5) and developing substantially along the longitudinal direction (100) up to a longitudinal end face (8) of the movable body (5) facing the open longitudinal end (4) of the mixing chamber (3), wherein the respective end portions (20) of the first (6) and second channel (7) develop inside the movable body (5) or they are made by respectively a first (9) and a second groove (10) obtained on a longitudinal surface (11) of the movable body (5), each groove (9, 10) having development with a component perpendicular to the longitudinal direction (100).

A method for obtaining and applying a sealing gasket element on a slide-valve sliding in a cavity of an apparatus for the recirculation and mixing of chemically reactive polymeric components, comprises the steps of: obtaining from an elastic-plastic material a precursor element of the seal element, with a grid structure having a reticular shape; positioning the precursor element around the slide-valve; exerting on the precursor element, through temporary clamping elements, a radial compression and contraction action to insert it and couple it to one or more housing seats provided on the slide-valve so as to obtain the seal element well coupled to the latter; progressively removing the clamping elements to sequentially release successive parts of the gasket element and gradually free the slide-valve to gradually introduce the parts of the slide-valve—freed in succession—in the housing cavity allowing the sealing gasket element to gradually expand radially due to the elastic return by adhering tightly to the inner surface of the same housing cavity. The special equipment for fitting the sealing gasket element on the slide-valve and the so obtained recirculation and mixing apparatus is also described.

A method for obtaining and applying a sealing gasket element on a slide-valve sliding in a cavity of an apparatus for the recirculation and mixing of chemically reactive polymeric components, comprises the steps of: obtaining from an elastic-plastic material a precursor element of the seal element, with a grid structure having a reticular shape; positioning the precursor element around the slide-valve; exerting on the precursor element, through temporary clamping elements, a radial compression and contraction action to insert it and couple it to one or more housing seats provided on the slide-valve so as to obtain the seal element well coupled to the latter; progressively removing the clamping elements to sequentially release successive parts of the gasket element and gradually free the slide-valve to gradually introduce the parts of the slide-valve—freed in succession—in the housing cavity allowing the sealing gasket element to gradually expand radially due to the elastic return by adhering tightly to the inner surface of the same housing cavity. The special equipment for fitting the sealing gasket element on the slide-valve and the so obtained recirculation and mixing apparatus is also described.

An extruder system for degassing a mixture, comprising a first extruder, a second extruder arranged downstream of the first extruder and a transfer zone formed between these extruders, characterized by a pressure regulating device which can regulate the pressure at the outlet of the first extruder.

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.

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 for handling a product, in particular a viscous, pasty product, with at least one rotating shaft (3, 11) in a product space (5), a driving spindle (11) of the shaft (3) is mounted and sealed outside the product space (5) in a housing consisting of a plurality of parts (7, 8, 12). The sealing is brought about by at least two seals (2, 4), wherein a dynamic seal (2) follows an eccentric movement of the shaft (3) and takes on dynamic sealing of the rotating shaft (3), while another seal (4) compensates for an eccentric movement of the shaft (3) in relation to the housing by plastic or elastic deformation and therefore prevents a leakage between the housing part (12), which moves eccentrically, and a rigid housing (10). A defined quantity of liquid, which serves as a blocking agent and lubricant for the dynamic seal (2) of the shaft (3) towards the housing part (7), is metered in here, the liquid, apart from a residual excess, being drawn into the dynamic seal (2) by a pressure difference therewithin and thereby forming an effective block and seal.

A method for handling a product, in particular a viscous, pasty product, with at least one rotating shaft (3, 11) in a product space (5), a driving spindle (11) of the shaft (3) is mounted and sealed outside the product space (5) in a housing consisting of a plurality of parts (7, 8, 12). The sealing is brought about by at least two seals (2, 4), wherein a dynamic seal (2) follows an eccentric movement of the shaft (3) and takes on dynamic sealing of the rotating shaft (3), while another seal (4) compensates for an eccentric movement of the shaft (3) in relation to the housing by plastic or elastic deformation and therefore prevents a leakage between the housing part (12), which moves eccentrically, and a rigid housing (10). A defined quantity of liquid, which serves as a blocking agent and lubricant for the dynamic seal (2) of the shaft (3) towards the housing part (7), is metered in here, the liquid, apart from a residual excess, being drawn into the dynamic seal (2) by a pressure difference therewithin and thereby forming an effective block and seal.

The present invention relates to an overturning device (10) for overturning a molten material (200) in a melt channel (110) comprising a melt inlet (20) and a melt outlet (30) wherein between the melt inlet (20) and the melt outlet (30) at least one melt guidance means (40) is assembled for a rearrangement of the molten material (200) from the center (22) of the melt inlet (20) to the edge (34) of the melt outlet (30) and for rearrangement of the molten material (200) from the edge (24) of the melt inlet (20) into the center (32) of the melt outlet (30).

The present invention relates to an overturning device (10) for overturning a molten material (200) in a melt channel (110) comprising a melt inlet (20) and a melt outlet (30), wherein between the melt inlet (20) and the melt outlet (30) at least one melt guiding means (40) is assembled for a rearrangement of molten material (200) from the centre (22) of the melt inlet (20) to the edge (34) of the melt outlet (30) and for a rearrangement of molten material (200) from the edge (24) of the melt inlet (20) into the centre (32) of the melt outlet (30).