A forming mold for making polyvinyl chloride foamed wood-like slats includes an inlet, an outlet, and two main flow passages symmetrically arranged with respect to a central axis. The main flow passages each have an inlet section and an outlet section. The inlet section of each main flow passage is connected to the inlet. The extension direction of the inlet section of each main flow passage respectively defines with the central axis an included angle therebetween. The sum of the angles of the two first included angles ranges from 45 to 52 degrees. The longitudinal cross-sectional width of each main flow passage gradually decreases from the inlet toward the outlets. In this way, the forming mold of the present invention can effectively improve production efficiency and can increase the stability of the product manufacturing process.

A forming mold for making polyvinyl chloride foamed wood-like slats includes an inlet, an outlet, and two main flow passages symmetrically arranged with respect to a central axis. The main flow passages each have an inlet section and an outlet section. The inlet section of each main flow passage is connected to the inlet. The extension direction of the inlet section of each main flow passage respectively defines with the central axis an included angle therebetween. The sum of the angles of the two first included angles ranges from 45 to 52 degrees. The longitudinal cross-sectional width of each main flow passage gradually decreases from the inlet toward the outlets. In this way, the forming mold of the present invention can effectively improve production efficiency and can increase the stability of the product manufacturing process.

A method for manufacturing a foil having a variable strip geometry, which makes it possible to supply a foil that bears a complex security feature. Varying of the geometry is effected by means of a movement of a position-variable distributor rail of the extruder.

An extrusion system (10) is provided that has first and second extruders (12,14) with first and second extrusion barrels (50,52). First and second extruded components (24,26) are transferred through the barrels (50,52) to a die (22) to coextrude tire tread (20) from the first and second extruded components (24,26). A horizontal plane (70) is located above ground in a vertical direction (40) and extends through both the first extrusion barrel (50) and the second extrusion barrel (52).

An extrusion system (10) is provided that has first and second extruders (12,14) with first and second extrusion barrels (50,52). First and second extruded components (24,26) are transferred through the barrels (50,52) to a die (22) to coextrude tire tread (20) from the first and second extruded components (24,26). A horizontal plane (70) is located above ground in a vertical direction (40) and extends through both the first extrusion barrel (50) and the second extrusion barrel (52).

A security marking has a physically unclonable function (PUF) wherein the PUF includes a disordered multilayer photonic crystal structure having an electromagnetic transmission and/or reflection spectrum and/or spectra upon receipt of electromagnetic radiation within a photonic bandgap region of the structure that is unique to the structure.

Provided is a head for a multi-layer extrusion device which can be easily and accurately adjusted to a change in size of an extruder and a change in extrusion shape. A head 1 for a multi-layer extrusion device is provided with a plurality of flow paths for separately guiding elastomer materials G from a plurality of extruders 2 to a pre-former attachment unit. The head 1 comprises: a main head 10 to which each extruder 2 is connected; an upper head part 11 positioned above the main head 10; and a lower head part 12 positioned below the main head 10. The plurality of extruders 2 include a first extruder 5 and a second extruder 6. The main head 10 is detachably divided into at least: a first head part 15 to which the first extruder 5 is connected; a second head part 16 to which the second extruder 6 is connected; a third head part 17 connected to the first head part 15 on the downstream side of the first head part 15; and a fourth head part 18 connected to the second head part 16 on the downstream side of the second head part 16.

Provided is a head for a multi-layer extrusion device which can be easily and accurately adjusted to a change in size of an extruder and a change in extrusion shape. A head 1 for a multi-layer extrusion device is provided with a plurality of flow paths for separately guiding elastomer materials G from a plurality of extruders 2 to a pre-former attachment unit. The head 1 comprises: a main head 10 to which each extruder 2 is connected; an upper head part 11 positioned above the main head 10; and a lower head part 12 positioned below the main head 10. The plurality of extruders 2 include a first extruder 5 and a second extruder 6. The main head 10 is detachably divided into at least: a first head part 15 to which the first extruder 5 is connected; a second head part 16 to which the second extruder 6 is connected; a third head part 17 connected to the first head part 15 on the downstream side of the first head part 15; and a fourth head part 18 connected to the second head part 16 on the downstream side of the second head part 16.

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.

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.