The present disclosure is related to apparatuses, processes, and extrusion screws directed to process solid detergent compositions in shapes like billets, bars, tablets, noodles, and similar shapes produced from extruded synthetic detergents, soaps, and combinations thereof. The present disclosure describes an extrusion screw for processing synthetic detergents, soaps, and combinations thereof. The extrusion screw comprises a feed section, a metering section, and a compression section. Said compression section has a proximal channel depth adjacent to the feed section, and a distal channel depth adjacent to the metering section, and a compression ratio that may be between 2.2, and 4.1, for example, between 2.2, and 2.6. The extrusion screw may have a length to diameter ratio (L/D) that may be between 4.0, and 6.0. The present disclosure also describes an apparatus for processing synthetic detergents, soaps, and combinations thereof. The apparatus comprises a barrel and said extrusion screw. The present disclosure also describes a process for extruding solid synthetic detergents, soaps, and combinations thereof. The process comprises a step of providing a formulation that may be selected from synthetic detergent, and half-synthetic soap to said apparatus, and compressing said formulation at a temperature between 32° C., and 42° C. with a compression section of the extrusion screw. The screw rotation speed of the extrusion screw may be between 4, and 20 RPM. The formulation may be provided prewarmed. The screw rotation speed of the extrusion screw may be between 4, and 35 RPM (e.g., between 4 and 20 RPM).

The invention relates to a screw (1) for an extruder or conveyor (20), in particular extruder screw, conveying screw or dosing screw for polymers, having a web (3) running helically around a core (2), wherein the web (3) is formed undercut on its active conveying flank (4) in a conveying direction (F) at least in a section of the screw (1).

A torpedo for an extruder comprises: longitudinal member (9) which is provided at the periphery thereof with a plurality of thread portions (12) which protrude outwards and which are spaced apart in the circumferential direction; a plurality of sluice blades (19) which are mounted so as to be movable on the longitudinal member and which are partially engaged in apertures (18) of the longitudinal member, the longitudinal member (9) and the sluice blades (19) being provided with complementary radial guiding surfaces (13, 14, 18) which are in contact with each other; and adjustment means (28) for radially displacing the sluice blades relative to the longitudinal member. The sluice blades extend through the spaces between the thread portions, respectively. The thread portions (12) and the sluice blades (19) are provided with complementary radial guiding surfaces (13, 14, 18).

A process for producing a polypropylene composition using a compounding extruder includes a) a melting section having a first elongated cylindrical tube with a first inlet port to receive a propylene-based polymer and additives containing an elastomer of ethylene and α-olefin comonomer having 4 to 8 carbon atoms and a first outlet port to discharge a first melt composition containing a melt of the propylene-based polymer and the additives and a first screw arranged in the first elongated cylindrical tube, convey the propylene-based polymer and the additives to the first outlet port, and a mixing section including a second elongated cylindrical tube having a second inlet port to receive the first melt composition, and a second outlet port to discharge a second melt composition containing the first melt composition and the optional further component and a second screw arranged in the second elongated cylindrical tube to convey the first melt composition to the second outlet, wherein the first screw and the second screw areoperable at different screw speeds. The process includes: A) feeding the propylene-based polymer and the additives to the first inlet and discharging the first melt composition from the first outlet, wherein the first screw is operated at a first screw speed and B) feeding the first melt composition from the first outlet to the second inlet, and discharging the second melt composition from the second outlet, wherein the second screw is operated at a second screw speed smaller than the first screw speed.

A conveyance portion, a barrier portion, and a path are provided at places of a screw main body in which a kneading portion is provided. In at least one of the places, the path is provided inside the screw main body, and includes an entrance and an exit. The entrance is opened to urge the raw materials having the conveyance limited by the barrier portion to increase pressure on the raw materials, to flow in the entrance. The raw materials flowing from the entrance flow through the path in the same direction as a conveyance direction of the conveyance portion.

At a part of the screw main body at which the kneading portion is provided, conveyance portions, a barrier portion and a path are provided at a plurality of places. At least one of the places, the path is provided inside the screw main body, and includes an entrance and an exit. The entrance is opened in such a manner that the raw material whose pressure is enhanced by being restricted in conveyance by the barrier portion flows into the entrance. The path is formed in such a manner that the raw material flowing into the path from the entrance flows toward the exit in a direction opposite to the direction of conveyance.

The invention relates to a method and a processing plant (1) for plastic material, for the recycling thereof. To this end, the processing plant (1) comprises a feed device (4), a processing unit (2) having a comminuting device (5) and a conveying device (6) adjoining the comminuting device (5), and an extrusion device (3) having an extruder screw (21). During its conveying movement along a first conveying section (9) toward a transfer region (8) by means of the conveying device (6), the comminuted plastic material is heated to a transfer temperature with a mean temperature value, which falls into the range of the softening temperature of the plastic material. In the transfer region (8), the comminuted plastic material is transferred to the extrusion device (3).

A no solid bed extruder screw for processing a material to a molten state has a body with a helical thread having pushing and trailing surfaces, he body extending longitudinally between feed and discharge ends. A channel for receiving the material to be processed is formed between the body outer surface and an outer diameter of the thread bounded by the pushing surface and the trailing surface. A volume of the channel decreases in a plurality of revolutions of the thread in a direction from the feed end to the discharge end. A channel depth between the pushing surface and the trailing surface decreases for a first portion of the channel toward the feed end and increases for a second portion of the channel toward the discharge end. At least one of the channel portions has a constant width and includes varying width sub-channels.

A compounding extruder includes a melting section having a first cylindrical tube having a first inlet to receive a propylene polymer and a first outlet to discharge a first melt composition and a first screw arranged in the first cylindrical tube and having a first length, a first outer screw diameter Do1 and a first inner screw diameter to convey the propylene polymer and to the first outlet and a mixing section comprising a second cylindrical tube having a second inlet to receive, the first melt composition from the first outlet, an end having a second outlet and a side inlet between the second inlet and the second outlet to receive a further component, and a second screw arranged in the second cylindrical to convey the first melt composition and the further component to the second outlet, wherein Do1 is 0.82 to 1.2×Do2.

Various measures increase the cooling effect on a planetary roller extruder section/module. Those measures include a choke being arranged at an outlet of the planetary roller extruder section or module, a distance between centerlines of adjacent planetary spindles being at least equal to an outer diameter of the planetary spindles, providing a pressurized melt supply, having a cooling section composed of several sections/modules, providing at least one section/module in which a flow, during melt supply is converse to the conveying direction of the extruder, and providing cooling tubes arranged within the central spindle.