CanPedia

Here is a glossary of terms for your canmaking needs

NOTE: CANPEDIA WILL BE UPDATED CONTINUOUSLY.

Term

Image

Description

Aerosol Can

Aerosol Can

A gas-tight container equipped with a valve that is designed to hold the product and the propellant gas under pressure. When the valve is opened, generally by finger pressure, the product is dispensed. (intracen)

Aluminium

Aluminium

A metal refined from bauxite ore into ingots by electrolysis. The ingots are rolled into thin sheets of foil or drawn and formed into can bodies. (intracen)

Aluminium Foil Container

A shaped die cavity-type of container that is formed by combining mechanical and air pressure on a light gauge aluminium foil. (niir)

Beading

The process wherein concave (interior bead) or convex (exterior bead) areas are formed spanning the can circumference to provide additional strength and stability to the body. (allstatecan)

Beverage Ends

Ends that have an easy opening from which the drink will pour out of the can perimeter.

Blank

A pre-cut metal sheet that is trimmed/sheared to a specified size will form the body of cans.

Can Body

The cylinder-shaped portion of a can to which the top and the bottom ends are attached by double seaming. (suretorque)

Coater

A roller machine that applies lacquer to coils or sheets.

Coating

The process in which a metal is covered with another material/substance for protection against corrosion and to ensure that the metal containers are safe for filling.

Coil Line

a. Machine used for sheet metal fabrication.
b. Machine used to manage metal coils for coating or cutting.

Cone End

A tapered shape lid is generally used on general line cans.  It has the general shape of a frustum of a cone. (suretorque)

Crown Cork End

A metal closure is lined with cork or plastic. The cap is crimped around its rim over the finish of a bottle to provide a hermetic seal. (packagingschool)

Curling

The process wherein the extreme edge of the end component is turned inward to provide a safe, finished curved edge. The curl forms the cover hook in a double seam. (packaging-labelling)

Dome End

A closure that is fitted to the can base to withstand internal pressure. (Metal Packaging Manufacturing Association, n.d.) 

Double Seam

A joint attaching the top or bottom end of a metal can to its body, formed by interlocking the edges of the end and the flanged body, double folding and rolling firmly together. (packagingschool)

Drawing

a. The operation of reforming sheet metal without changing its thickness.
b. A manufacturing process of forming cups from circular blanks cut from a metal sheet.

DRD Can

Type of container that had undergone drawing and redrawing operations.

DWI Can

Type of container that had undergone drawing and wall ironing operations enabling the cup to have smaller diameter with thin walls while increasing its height.

Earing

a. A phenomenon in which the top of a can is slightly wavy or has small ripples called 'ears' due to drawing and ironing processes.
b. A phenomenon that is attributed to the effect of the crystalline structure of aluminium sheets.  

Easy Open End

A can end that is scored on the circumference and fitted with a gripping device (tab) for easy removal of end. (tricorbraun)

Enamel Rating

The method of checking the integrity of the can's lacquer layer by measuring its conductivity. (fmea)

Extruded Can

a. A container where the height is greater than the diameter and may only be formed in aluminium.
b. Also referred to as aluminium monobloc can which is ideal for packaging of a pressurised aerosol, spray dispensing compressed gas and gasless products. 

Flanging

The process in which a projecting or flared edge is formed by bending outwards the rims of the can body-cylinder to enable heads and bottoms to be double seamed to the body. (tricorbraun

Flexibles

These are containers made out of aluminium foil, plastic, or paper materials. 

Full Aperture Easy Opening Ends  (FAEO)

Ends with a ring pull but when the ring is pulled, the complete end will detach resulting in a full aperture. Commonly used for foodstuff (both human and animals) such as pet food, soup, vegetables, etc. 

Headspace

The empty space in the can that is not filled with product. 

Hermetic Seal

A seal that excludes air and will be leakproof at normal temperatures and atmospheric pressures. (tricorbraun)

Ironing

The operation of thinning the wall of a two-piece can by passing it through-hardened circular dies. 

Lacquer

A solvent-based, clear protective layer is applied on metal surfaces for corrosion protection, to limit the interaction between the can itself and the food product, and to avoid discolouration of food product pigments packed inside the can.

Ribs

These are indentations applied on metal can enhance its resistance against deformation caused by operation processes or by changes in pressure during the shelf life of products. (lup)

Lithography

a. A method of printing or decorating flat surfaces by means of plates.
b. The prime method for printing on metal cans, but must be done on the sheet steel before the can is formed. (tricorbraun)

Metal Coil

a. Sheet metal rolled from slab or ingot that has been wound into coiled roll.
b. The most efficient way to store and transport sheet metal.

Metal Sheet

Metal that has been cut from a metal coil, formed by an industrial process into thin, flat pieces, and sheared to form blanks.

Necking

The process wherein the can diameter which is initially cylindrical is reduced by bending inwards the upper rim of the can to accommodate the smaller end. (cantechonline)

Offset Printing

The process of printing by indirect image transfer, especially by using a metal or paper plate to ink a smooth rubber cylinder that transfers the ink to the paper. (packagingschool)

Peel-off membrane End

A type of closure which has a membrane that seals the content from any external environment. The membrane sometimes sits inside a penny lever-type opening but is more often protected by a plastic cap. These lids are mostly used for milk powder. 

Penny Lever Ends

A reclosable cover for the opening of a container such as paint cans and can be opened using a penny as lever.  

Redrawing

The operation of reforming a two-piece can into one of smaller diameter and therefore greater height without changing its thickness.

Rivet

The drawn part from the can end where the tab is attached ensuring end integrity.

Sanitary Ends

These are the conventional/normal type of lids that can be opened with an old fashioned can opener.  

Seaming

The canning operation wherein a hermetic seal is formed by mechanically interlocking the can body to a can end. (wiki)

Shell

A plain lid that is stamped from a metal coil and transferred to a conversion press which converts the lid into an easy-open end. 

Slitting

Process of cutting a sheet of metal into narrower strips.

Soldering

A method for sealing the side seam and other joints of metal cans using a tin-lead alloy. Soldered seams are usually folded or hooked (lock seam), and must be lacquered to prevent corrosion and migration of metals into the product. (packagingschool)

Thermal Curing

A temperature-induced chemical reaction process that dries or sets inks, coatings or adhesives to increase their ability to withstand corrosion, erosion and degradation.

Three-Piece Can

A container consists of a cylindrical body rolled from a piece of flat metal with a longitudinal seam which is usually formed by welding, together with two can ends that are seamed onto each end of the body.

Tin-Free Steel

Chromium-coated steel. Because it is used in food cans just like tin plates, it ironically is classified as a tin mill product. 

Tinplate

Thin sheet steel with a very thin coating of metallic tin.

Tube

a. A cylindrical container of thin, flexible metal with integral shoulder and neck, with a screw cap closure made of plastic. (tricorbraun)
b. A soft squeezable container that can be used for thick liquids such as adhesive, caulking, ointment, and toothpaste. (Tube (container), 2018) 

Two-Piece Can

A container is made from a metal disc that is reformed into a cylinder with an integral end to become a seamless container wherein a loose end is seamed to finally close the can. 

UV Curing

The photochemical process instantly dries or sets inks, coatings, or adhesives using high-intensity ultraviolet light.

Varnish

a. A clear protective coating applied to the metal.
b. Types of which include gloss, matte, and stipple. (allstatecan)

Welding

A side seaming method for metal cans wherein the side walls are attached to one another through the use of heat and without using lead. (packagingschool)

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