A spaghetti-like long shaped pasta has a continuous internal longitudinal cavity communicating with the outside through a co-extended longitudinal slot with convex edges that delimit the internal cavity. A device for the production of such pasta includes an extrusion drawing having, at the entry front, a plurality of holes with complementarily identical openings that lead into respective channels of identical shape, configuration and size, which end in a joint discharge channel, near an edge of an expanded head. An occlusion at the outlet hole of the discharge channel includes a septum separating the delivery channels and causing the two flows of extruded pasta to join solely on a peripheral portion, opposite to the cavity edge, with the expanded head producing the internal cavity that develops longitudinally within the finished product and communicates with the outside through a co-extended cutting or fissure.

In one embodiment, a method of forming an extruded board includes mixing a resin and a foaming agent, melting the mixed resin and foaming agent to form a uniformly colored extrudate, differentially expanding voids formed from the foaming agent within the uniformly colored extrudate by passing the uniformly colored extrudate through a breaker plate, forming a board with the differentially expanded voids and uniformly colored extrudate, and forming lightened portions on an outermost surface of the formed board.

A system and method are presented in which a flow of plastic is extruded to obtain nano-sized features by forming multiple laminated flow streams, flowing in parallel through the non-rotating extrusion system. Each of the parallel laminated flow streams are subjected to repeated steps in which the flows are compressed, divided, and overlapped to amplify the number of laminations. The parallel amplified laminated flows are rejoined to form a combined laminated output with nano-sized features. The die exit is formed to provide a tubular shape.

A device (4) for the manufacture of an annular extrudate comprises a jacket (2), a crosshead (1) arranged inside of the jacket. The jacket contains a melt passage, whereby the crosshead is arranged in the melt passage, such that the melt passage extends et least at the outlet of the device as an annular melt passage around the crosshead (1). An annular passage (5) is formed between the crosshead and the jacket. The annular passage contains a static mixer (3), whereby the crosshead is at least partially supported by the static mixer in the jacket. The static mixer comprises a plurality of inserts, whereby at least a portion of the inserts is connected to the crosshead and/or the jacket.

Methods for extrusion of polyolefins (110) that utilize melt temperature to control molecular weight and also reduce gels. Disclosed herein is an example method for controlling polymer chain scission in an extrusion system (100), comprising: melting a polyolefin resin (110) in extruder (102) at a first melt temperature to form a first melt (112); passing the first melt (112) through a screen pack (106); forming the first melt 112) into a first polyolefin product (116, 118); melting additional polyolefin resin (110) of the same grade in the extruder (102) at a second melt temperature to form a second melt (112), wherein the second melt temperature differs from the first melt temperature by 5 C. or more to control chain scission in the extruder (102); passing the second melt (112) through the screen pack (106); and forming the second melt (112) into a second polyolefin product (116, 118).

A preformer (1) is designed to extrude jointly a plurality of elastomer mixes in a direction of flow (X1), in order to form a profiled element, the preformer comprising for this purpose, superimposed in a direction of stacking (Z1), transverse to the direction of flow (X1), a first channel (11), a second channel (12) which is separated from the first channel (11) by a first partition (15), then a third channel (13), separated from the second channel (12) by a second partition (16), the preformer also comprising a stiffener (20) formed integrally with the first partition (15) and the second partition (16), and extends through the second channel (12), having a leading edge (21) which splits the flow of elastomer material following the second channel (12).

The invention relates to a melt conductor (1), in particular a melt distributor or melt mixer, for an extruding die (2) of an extrusion facility (3), comprising a melt conductor block (4) with a multi-channel system (5), the multi-channel system (5) being arranged inside the melt conductor block (4) with three-dimensional extension and having at least one input (6) and at least one output (7) for polymer melt, between one input (6) and one output (7) fluidically connected to the input (6) several branchings (8) arranged in series and several levels (9a) of sub-branches (10) being formed over several levels (12a, 12b) of divided melt channels (11a, 11b); with m melt channels (11a) of the a.sup.th level (12a) with X.sup.th local cross-sections and n melt channels (11b) of the b.sup.th level (12b) with y.sup.th local cross-sections being present, wherein n>m if b>a, the y.sup.th local cross-sections of the melt channels (11b) of the b.sup.th level (12b) being smaller than the X.sup.th local cross-sections of the melt channels (11a) of the a.sup.th level (12a). The invention further relates to an extruding die, an extrusion facility and to a method of operating the extrusion facility.

A twin-screw extruder is configured to produce rolls of plastic stretch film on a continuous basis, starting from the extrusion of granules of one or more polymers an using cast extrusion.

A shim stack foaming die for making foam slabs comprises a plurality of shims that are layered together under pressure to form a shim stack, wherein the shims combine to collectively define a plurality of die orifices in a working face, to define a main body of the shim stack foaming die, and also to define a plurality of die cavity that is fluidly connected to the plurality of die orifices. And articles foamed from the shim stack foaming die have found wide use in various applications, thermal or acoustic insulation, reinforcing layers and/or space-filling layers, and so on.

A method for producing an electrically conductive seamless tube includes (1) preparing an electrically conductive resin composition containing a thermoplastic resin and an electrically conductive filler, (2) preparing a cylindrical extruding die including a cylindrical slit, at least one circumferential distribution channel communicating with the slit and distributing the resin composition that is plasticized in a circumferential direction of the slit, and at least one lead-in path that leads the plasticized resin composition into the circumferential distribution channel, the lead-in path containing a line mixer; (3) introducing the plasticized resin composition into the lead-in path toward the circumferential distribution channel; (4) introducing the plasticized resin composition flowing through the lead-in path into the circumferential distribution channel toward the slit; and (5) introducing the resin composition flowing through the circumferential distribution channel into the slit and extruding the resin composition from an outlet of the slit into a cylindrical shape.