It is described an apparatus for the extrusion and mixing of plastic materials, for example rubber-based and silicone-based materials, comprising a dump extruder body whereon two conical screws (2) converging towards an extrusion die (3) suitable for being occluded by closing means (4) are mounted, the conical screws (2) being accommodated within a low-pressure compounding chamber (1) and within a pair of converging conical channels also defining a high-pressure chamber (2′), said low-pressure chamber (1) corresponding to an upstream area with respect to an extrusion direction, wherein said high-pressure chamber (2′) and/or said low-pressure chamber (1) accommodate a presser body (5, 5′, 6), defining a movable wall suitable for causing a controlled change in the volume of the respective chamber (1, 2′).
B01F 27/722 - Mixers with rotary stirring devices in fixed receptaclesKneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices with two or more helices in the same receptacle the helices closely surrounded by a casing
B01F 101/00 - Mixing characterised by the nature of the mixed materials or by the application field
2.
TWIN-SCREW MIXER-EXTRUDER, INCLUDING A PRESSER BODY FOR DEFINING A CONTROLLED VOLUME OF A COMPOUNDING CHAMBER
Apparatus for the extrusion and mixing of plastic materials, for example rubber-based and silicone-based materials, comprising a dump extruder body whereon two conical screws (2) converging towards an extrusion die (3) suitable for being occluded by closing means (4) are mounted, the conical screws (2) being accommodated within a low-pressure compounding chamber (1) and within a pair of converging conical channels also defining a high-pressure chamber (2'), said low-pressure chamber (1) corresponding to an upstream area with respect to an extrusion direction, wherein said high-pressure chamber (2') and/or said low-pressure chamber (1) accommodate a presser body (5, 5', 6), defining a movable wall suitable for causing a controlled change in the volume of the respective chamber (1, 2').
B29B 7/24 - Component parts, details or accessoriesAuxiliary operations for feeding
B29B 7/20 - MixingKneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
B29B 7/26 - Component parts, details or accessoriesAuxiliary operations for discharging, e.g. doors
B29C 48/395 - Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
B29C 48/40 - Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws, e.g. twin screw extruders
B29C 48/52 - Screws with an outer diameter varying along the longitudinal axis, e.g. for obtaining different thread clearance
B29B 7/74 - MixingKneading using other mixers or combinations of dissimilar mixers
3.
Machine for mixing and extruding rubber-based and silicone-based plastic materials and method therefor
A machine for the mixing and extrusion of rubber-based and silicone-based plastic materials and method thereof is disclosed, comprising a dump extruder with conical converging twin screws (10) arranged in a batching chamber (12) in which the outlet of the dump extruder is temporarily closed by a removable blind flange (11), the batching chamber also acting as a compounding chamber.
B29B 7/20 - MixingKneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
B29C 47/40 - using at least two intermeshing screws
B01F 7/08 - Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices
patents
