A single-screw extruder (100), and a method. The extruder (100) comprises—a cylindrical rotor member (1) having diameter (D) and length (L) and comprising a feeding zone (14), —the rotor member (1) arranged in a barrel (2), —the cylindrical surface of the rotor member (1) carrying cavity/cavities and/or projection(s) (5) arranged in helically extending rows, —the helically extending row(s) of the rotor member (1) having a pitch (P) and depth (d) in the feeding zone (14) of the rotor member, and the extruder (100) further compris-ing—a drive system (4) for the rotation of the rotor member (1) in the barrel (2). The relation of the depth (d) to the diame-ter (D) of the rotor member, i.e. d:D, is not more than 1:20, and the relation of the pitch (P) of the rotor member to the di-ameter (D) of the rotor member, i.e. P:D, is not more than 1:4.

A method and apparatus for thermolysing organic material. The method comprises steps of: A) feeding the material in a single-screw extruder (100), the extruder comprising a cylindrical rotor member (1) having diameter (D) and length (L) and comprising a feeding zone (14), the rotor member (1) arranged in a barrel (2), the cylindrical surface of the rotor member (1) carrying cavity/cavities and/or projection(s) (5) arranged in helically extending rows, the helically extending row(s) of the rotor member (1) having a pitch (P) and depth (d) in the feeding zone (14) of the rotor member, wherein the relation of the depth (d) to the diameter (D) of the rotor member, i.e. d:D, is not more than 1:20, and the relation of the pitch (P) of the rotor member to the diameter (D) of the rotor member, i.e. P:D, is not more than 1:4, B) heating the material in the single-screw extruder (100) to a flowable state, and C) thermolysing the material.

A rubbery polymer extrusion dryer includes: a cylinder; a liner provided on an inner peripheral surface of the cylinder; a screw rotatably arranged in the liner; wherein the rubbery polymer extrusion dryer conveys a rubbery polymer by the screw rotating in the liner, wherein a plurality of grooves extending in a conveying direction of the rubbery polymer are formed on an inner surface of the liner, and wherein widths of the grooves are 0.1 mm or more and 2 mm or less.

A single-screw extruder (100), and a method. The extruder (100) comprisesa cylindrical rotor member (1) having diameter (D) and length (L) and comprising a feeding zone (14), the rotor member (1) arranged in a barrel (2), the cylindrical surface of the rotor member (1) carrying cavity/cavities and/or projection(s) (5) arranged in helically extending rows, the helically extending row(s) of the rotor member (1) having a pitch (P) and depth (d) in the feeding zone (14) of the rotor member, and the extruder (100) further comprising a drive system (4) for the rotation of the rotor member (1) in the barrel (2). The relation of the depth (d) to the diameter (D) of the rotor member, i.e. d:D, is not more than 1:20, and the relation of the pitch (P) of the rotor member to the diameter (D) of the rotor member, i.e. P:D, is not more than 1:4.

The present invention relates to a volume pulsed deformation plasticating and conveying method and device by an eccentric rotor. The rotation of the eccentric rotor and the rolling of the rotor in the inner cavity of a stator during constant reverse revolutions cause the volume of the material between the eccentric rotor and the stator to periodically change alternatively along the axial direction and the radial direction of the stator, thereby enabling the volume pulsed deformation plasticating and conveying of the material. The volume pulsed deformation plasticating and conveying device consists of a stator, of which the inner cavity comprises multiple alternatingly disposed spiral segments and straight segments, and an eccentric rotor comprising multiple alternatingly disposed eccentric spiral segments and eccentric straight segments. The eccentric rotor is disposed in the inner cavity of the stator. The eccentric spiral segments and the eccentric straight segments of the eccentric rotor correspond one-to-one with the spiral segments and straight segments of the stator. The present invention can be used as the extruding system of an extruder or be combined with different plunger injection units to form a plasticating injection device of an injection molding machine. The present invention has a short thermo-mechanical distance for the materials, low energy consumption, and wide adaptability.

An extruder-mixer has a stator and a rotor arranged coaxially to the stator. The rotor is mounted rotatably relative to the stator. The stator, at least in portions, is arranged inside a volume spanned by the rotor. Such an extruder-mixer may be with an extruder. An extruder screw may be mounted in a screw housing of the extruder and coupled to a screw drive of the extruder.

A method for producing a wet rubber masterbatch uses a single-screw extruder. The single-screw extruder includes a screw, and an external cylinder in which a slit extended along the length direction of the external cylinder (the screw-shaft direction) is formed in an internal wall surface of the external cylinder, and when the width of the slit is represented by A and the clearance between a crest of the screw and the internal wall surface of the external cylinder is represented by B, the following expression (1) is satisfied:
0<AB(Y)/AB(X)<0.9(1)
wherein AB (Y) is the product of A and B at a downstream side along the screw-shaft direction of the external cylinder, and AB (X) is the product of A and B at an upstream side along the screw-shaft direction of the external cylinder.

A method and apparatus for thermolysing organic material. The method comprises steps of: A) feeding the material in a single-screw extruder (100), the extruder comprising a cylindrical rotor member (1) having diameter (D) and length (L) and comprising a feeding zone (14), the rotor member (1) arranged in a barrel (2), the cylindrical surface of the rotor member (1) carrying cavity/cavities and/or projection(s) (5) arranged in helically extending rows, the helically extending row(s) of the rotor member (1) having a pitch (P) and depth (d) in the feeding zone (14) of the rotor member, wherein the relation of the depth (d) to the diameter (D) of the rotor member, i.e. d:D, is not more than 1:20, and the relation of the pitch (P) of the rotor member to the diameter (D) of the rotor member, i.e. P:D, is not more than 1:4, B) heating the material in the single-screw extruder (100) to a flowable state, and C) thermolysing the material.

A method for preparation of decontaminated natural rubber is provided. The method is characterized in that it comprises a decontamination step in which wet natural rubber coagulum passes through a system comprising an extruder and a filter installed at the extruder outlet, the extruder comprising an axially symmetrical grooved sheath comprising in its thickness grooves opening on the inner surface of the sheath.

A method for preparation of decontaminated natural rubber is provided. The method is characterized in that it comprises a decontamination step in which wet natural rubber coagulum passes through a system comprising an extruder and a filter installed at the extruder outlet, the extruder comprising an axially symmetrical grooved sheath comprising in its thickness grooves opening on the inner surface of the sheath.