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 a melt guidance 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).

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 wood-grained polymer substrate includes a plurality of layers of different colors. The substrate is formed into elongated boards and used in the production of various end products similar to natural wood. Methods for producing the wood-grained polymer substrate are also provided.

An apparatus and method for forming as extruded variegated plastic profile, including a multi-manifold slotted feed block assembly having a primary input manifold assembly, a secondary input manifold assembly, a flow distribution assembly in fluid communication with the primary input manifold assembly and the secondary input manifold assembly, a zone assembly having at least one restrictor and at least one mixer, and optionally, an extra line manifold assembly in communication with the flow distribution assembly.

Various implementations include a coextrusion device including a first shim plate and a second shim plate coupled to the first shim plate. The first and second shim plates each have a first side, a second side opposite and spaced apart from the first side, a first end, and a second end opposite and spaced apart from the first end. The second end defines one or more outlet openings. A flow channel extends from each of the one or more outlet openings and extends along a centralized axis from the second end toward the first end. A central plane extends perpendicular to the first side and along each of the centralized axes of each shim plate. The central planes of the first and second shim plates intersect an axis perpendicular to the central planes and are spaced apart from each other.

A coextrusion die for manufacturing multilayer, coextruded, tubular preforms made from thermoplastic plastic. A storage cylinder element has an inner storage space. A spindle, and an annular storage space is formed between the spindle and the storage cylinder element, which opens into an output ring channel. An extrusion head, which is axially displaceable with respect to the storage cylinder element includes a ring piston, in which at least two heart distributor elements are coaxially arranged. A flow channel is formed in each case between the ring piston and the adjacent heart distributor element as well as between each of two heart distributor elements, which widens from an inlet opening to a distributor ring channel from where it transitions into a cylindrical ring channel as a frustoconical ring channel.

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 wood-grained polymer substrate includes a plurality of layers of different colors. The substrate is formed into elongated boards and used in the production of various end products similar to natural wood. Methods for producing the wood-grained polymer substrate are also provided.

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).

A melt distributor (1) having a plurality of bifurcated melt passages melt passages (5.1, 5.2, 5.3) for redirecting and distributing melt flows from a thermoplastic plastic. The melt distributor can be connected to a multiple extrusion head for producing multi-layer preforms. The branched junction (8) is configured as a rounded y-shaped conduit branch, and at least the branched junction (8) between a supply passage part (6) and the discharging passage parts (7.1, 7.2) of the bifurcated melt passage follows a continuously bent curve, the curvature of which is not equal to zero. The rounded and continuously bent configuration of the branched junction (8) contributes to shorter flow paths and avoids the formation of dead zones.