Provided is a resin composition comprising an ethylene-vinyl alcohol copolymer (A), a hydrate-forming metal salt (B), and a polyamide-based resin (C) that inhibits elution of a resin composition layer during hot water sterilization treatment of a multilayered structure including the resin composition layer, while suppressing odor during melt molding of the resin composition. An aromatic polyamide (C1) and an aliphatic polyamide (C2) are used for the polyamide-based resin (C) at a proportion of (C1)/(C2)=55/45-99/1.

A method of making multilayer foam sheet from recycled polyester sources, which may be used for packaging applications. The method comprises a co-extrusion system comprising at least two single screw extruders. A low I.V. polyester feedstock comprising up to 100% of the polyester flakes from recycled sources with an intrinsic viscosity (I.V.) of lower than 0.8 dL/g as measured by ASTM D4603-18 is directly being fed into the extruders. Supercritical physical blowing agent is introduced into the melted polyester feedstock in at least one of the extruders wherein the processing temperature is in the range of 15% lower than the melting temperature and 15% higher than the melting temperature. Then, coextruding the feedstock from the extruders of the co-extrusion system through a flat sheet die to make a multilayer foam sheet, wherein at least one layer is a foam layer comprising low I.V. polyester.

The present disclosure discloses a multi-layer co-extrusion stone plastic floor. The multi-layer co-extrusion stone plastic floor includes at least one co-extrusion stone layer, the co-extrusion stone plastic layer including a first stable layer, a stone plastic rigid layer, and a second stable layer successively. A size change rate of the first stable layer and the second stable layer is within a range of 0 to 0.12% within a temperature range of −15° C. to 80° C. At least one of the first stable layer, the stone plastic rigid layer, and the second stable layer includes composite particles of acrylate copolymer (ACR)/nano SiO.sub.2. The multi-layer co-extrusion stone plastic floor has improved strength, improved thermal stability and reduce thermal deformation by adding stable layers above/below the plastic rigid layer and adding the composite particles of ACR/nano SiO.sub.2.

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.

An extruder system for rapid change between different melt strength polymers is provided. The extruder system includes at least three polymer extruders; a flow spool; and a multilayer feedblock including a first combining zone, a second combining zone, and at least one cartridge insert arrangement in each of the first combining zone and the second combining zone; where each cartridge insert arrangement is configured to receive a cartridge insert, the cartridge insert directing flow of a polymer from one of the polymer extruders. Also provided are method of forming an encapsulated coating with the extruder system and an encapsulate coating formed with the extruder system.

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.

The invention is directed to 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. The varying of the geometry is effected by means of an adaptation of a melt flow 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 cast film is made from at least one ethylene polymer which comprises from 75.0 mol % to 100.0 mol % of ethylene derived units and which has a density of from 0.900 g/cm.sup.3 to 0.926 g/cm.sup.3, a melt index (I.sub.2.16) from greater than 1.2 g/10 min to 6 g/10 min, a melt index ratio (I.sub.21.6/I.sub.2.16) of from 20 to 50, and a z-average molecular weight (M.sub.z) of greater 150,000 g/mol. The cast film has an average flex crack resistance as measured by ASTM F392 of less than or equal to 15 holes/300 cm.sup.2 after 10,000 cycles, preferably 8±1 holes/300 cm.sup.2 after 10,000 cycles.