Abbreviation for a process known as Pressure Swing Absorption which produces gaseous nitrogen for shrouding in the die area.

Pounds per square inch a measure of pressure or mechanical load.

The simultaneous rolling of two or more thicknesses of foil.

A three piece hollow die composed of a die, backer and porthole, which shortens the feed length.

A coil that has been processed to final temper as a single unit. The parent coil may subsequently be cut into two or more smaller coils or into individual sheets or plates to provide the required width and length.

A plate that has been processed to final temper as a single unit. The parent plate may subsequently be cut into two or more smaller plates to provide the required width and length.

A condition unique to stepped extrusions where more than one cross section exists in the same extruded shape. A stepped shape uses a split die for the minor or small cross section and after its removal another die behind it for the major configuration. Slightly raised fins can appear on that portion of the shape where the two dies meet.

A tool used to hammer the surface of a die.

A method of evaluting hardness/adhesion using graded drawing leads, often used as an indication of cure.

The plastic (non-elastic) deformation or deformation above the elastic limit, remaining after the load is removed.

The passage or diffusion of a gas, vapor, liquid or solid through a barrier without physically altering it; the rate at which this diffusion or passage occurs. Aluminum is essentially impermeable, an important factor in its widespread use in containers and packaging.

The properties, other than mechanical properties, that pertain to the physics of a material; for example, density, electrical conductivity, heat conductivity, thermal expansion.

A pocket in the die cap of specified depth and distance from the bearing around the profile's contour before the bearing that allows additional control of the metal flow. Sometimes termed a Forming Pocket.

The transfer of portions of the coating from one surface of the sheet to an adjacent surface due to poor adhesion of the coating.

Small particles of oxide adhering to the surface of a product at irregular intervals.

Small particles of aluminum and aluminum oxide generated in the roll bite which subsequently transfer to the rolled product. It may be distributed uniformly and/or in streaks. See also Streak, Coating.

A fixed mandrel, attached to the press stem, used on either cored or hollow billets to produce seamless tubular product.

An insoluble coloring agent suspended in a fluid medium, as in inks, lacquers, and paints.

A dry substanced dispersed uniformly in a paint to give color, opacity, or other special properties.

A replaceable mandrel core.

Precision machined pins used for measuring normally available as plus, minus and net size.

A method commonly used for checking wall thickness consistency in a die using pin gauges.

The actual dimensions of a die opening measured with pin gauges.

(1) Minute hole in foil. (2) A small-sized void in the coating of a sheet or foil product. A typical cause is solvent popping.

Pipe brought to the final dimensions by drawing through a die.

Pipe formed by hot extruding.

Pipe that does not contain any line junctures (metallurgical welds) resulting from the method of manufacture. This product may be produced by extruding or by drawing, using either die-and-mandrel or hot-piercer processes. (Typically used for fluid-carrying applications under pressure.)

Pipe, brought to final dimensions by extruding through a bridge-type die or by similar methods at the option of the producer. (Typically used for structural, nonpressure applications.)

(1) A depression in the rolled surface which is usually not visible from opposite side. (2) A sharp depression in the surface.

Distortion that remains after removal of the load that caused it.

The ability of a material to be deformed extensively without rupture.

A coating incorporating polyvinyl chloride (PVC), used mainly on such products as industrial building sheets and residential siding, and sometimes formulated for spraying. Plastisols require application of a special primer to achieve proper bonding to aluminum.

A rolled product that is rectangular in cross section and with thickness not less than 0.250 inch with sheared or sawed edges.

Top

Circle cut from plate.

Composite plate comprised of aluminum alloy core having on both surfaces (if on one side only, Alclad One Side Plate) a metallurgically bonded aluminum or aluminum alloy coating that is anodic to the core, thus electrolytically protecting the core against corrosion.

A hardened tool steel ring inserted into the platen to support the die and support tools.

The recessed opening in the rear face of the front extrusion press platen into which the pressure ring is inserted to provide support for the tool stack.

Smoothing a metal surface, usually by rubbing with fine abrasives. A mechanical finishing operation for the purpose of producing a gloss or luster on the surface of a product.

A chain-like compound of high molecular weight formed by the linkage of simple molecules (monomers) under suitable conditions. When two or more different monomers are involved, the product is called a copolymer.

Blister and/or void in the coating resulting from trapped solvents released during curing process.

Fine pores or hollows within a body of metal.

The openings or entry on the face of a porthole die through which the aluminum separates and flows into the welding chamber.

A die having a stationary core or mandrel which is held in place by integral core supports or webs. The porthole die is a modification of the spider die, except that the spider is replaced with a chambered disk that supports the mandrel (sometimes termed a stub mandrel); several portholes running through it annularly about the mandrel, distinguish the porthole types. The die contains a weld chamber so that when the billet is pushed the metal divides to flow around the core supports and welds together in the welding chamber before passing through the die. Porthole dies are used in producing extruded hollow profiles and tubing. See Bridge and Spider Dies.

The feed area on the entry side of a hollow side of a hollow die which are the openings through which the metal stream flows.

The common name for a single electrolytic aluminum reduction cell. See Cell.

Application of a coating in the form of a finely ground powder of coloring agents, resins, and additives; heating of the part, either before or after powder deposition, fuses the powder into a continuous coating.

A recessed pocket built into the die cap of a hollow die with the approximate configuration of the die openings. The purpose of this pocket is to aid in correcting for small distortion.

The extent to which repeated measurement of a standard with a given instrument yields the same result.

A high temperature soaking treatment to provide a desired metallurgical structure. Homogenizing is a form of preheating.

The relationship between the center lines of the container, ram, and tool stack.

The hydraulic machine which applies pressure to an aluminum billet inside a container, extruding it through the opening of a die.

Parts of an extrusion press that are changed to produce a specific shape. This includes stem, fixed dummy, container and liner.

A steel ring that is fitted into the center of the press platen against which the tooling stack is supported during extrusion.

The chemical alteration of a surface to make it suitable for application of paint or powder. The process usually includes cleaning and applying a conversion coating.

Type of paint applied to a surface to increase its comptability with a topcoat, or to improve adhesion or the corrosion resistance of the substrate.

A product that is long in relation to its cross-sectional dimensions, having a cross-section other than those of wire, rod, bar, and tube, produced by extrusion, rolling, drawing, or cold finishing. Formerly termed a shape.

A hollow extruded profile, the void of which is round and 1 inch or more in diameter and whose weight is equally distributed on opposite sides of two or more equally spaced axes.

Any hollow extruded profile other than Class 1, which does not exceed a 5-inch diameter circumscribing circle and has a single void of not less than 0.375-inch diameter or 0.110-square inch area.

Any hollow extruded profile other than class 1 or Class 2.

A profile brought to final dimensions by cold-working to obtain improved surface finish and dimensional tolerances.

A profile produced by cold-finishing an extruded profile.

A cold-finished section produced from an extruded profile which is brought to final dimensions by cold working to obtain improved surface finish and closer dimensional tolerances.

A profile produced by cold-finishing a rolled profile.

A profile brought to final dimensions by drawing through a die.

A profile produced by hot extruding.

A hollow profile having plain inside surfaces and whose outside surfaces comprise regular, longitudinal, concave corrugations with sharp cusps between corrugations.

Top

An extruded profile twisted along its length. (Sometimes erroneously called spiral).

A profile, any part of whose cross section completely encloses a void.

A hollow extruded profile whose void is round and one inch or more in diameter, and whose weight is equally distributed on opposite sides of two or more equally spaced axes.

Any hollow extruded profile other than Class 1, which does not exceed a 5-inch diameter circumscribing circle and has a single void of not less than 0.375 inch diameter or 0.110 square inch area.

Any hollow extruded profile other than Class 1 or Class 2.

A hollow profile of generally circular cross section and nominally uniform wall thickness with one hollow or solid protuberance or lip parallel to the longitudinal axis; used principally for heat-exchange purposes.

A hollow profile with regularly spaced, longitudinal serrations outside and round inside, used primarily for making small gears.

A profile produced by hot rolling.

A profile any part of whose cross section is a partially enclosed void the area of which is substantially greater than the square of the width of the gap. The ratio of the area of the void to the square of the gap is dependent on the class of semihollow profile, the alloy and the gap width.

A semihollow profile brought to final cross-sectional area by extruding.

A profile other than hollow or semihollow.

Erroneously used sometimes where the term helical extruded profile is intended.

An extruded profile whose cross-section changes abruptly in area at intervals along its length.

A hollow profile with a cross-section of teardrop shape.

A profile in certain standard alloys, tempers, sizes, and section, such as angles, channels, H-sections, I-beams, tees, and zees commonly used for structural purposes. For channels and I-beams, there are two standards, namely Aluminum Association Standard and American Standard.

An extruded profile whose cross section changes continuously in area along its length or a specified portion thereof.

A device which guides metal down the runout table as it is being extruded.