By: Berlin Packaging Specialist
Date: October 20, 2019
Why Metal?
Metal is one of the world’s most abundant raw materials, superior content protection and boast a very low environmental impact.
Types of Metal Liners
- C-Enamel liner works with low acidic foods “Think C is for Corn.” For prolonged stored foods with low acidity, but have the ability to discolor a raw metal can surface.
- White Enamel liner works with higher acidic foods “Think Red”, like beets, berries, tomatoes, etc.
- Epoxy liner is suitable for most latex and water based solvents and increased chemical compatibility.
- Laquer liner is FDA approved and for more acidic foods and aggressive solvents.
FAQ's About Metal
Heated:
Tinplate can be heated up 450°F (230°C). Carbon and Stainless Steel can be heated up to 2600°F.
Rust:
Much of our metal is treated with a rust inhibitor, but not rust preventer. Rust is based on moisture and oxygen and however much exposure a container gets to either one of these post manufacturing is what will determine if any, how much rust you will incur. Testing is recommended with your product.
Terms at a Glance
Bead:
Concave (interior bead ) or convex (exterior bead ) area usually 1/8" wide spanning the circumference of the tin to provide additional strength and stability to the tin body
Curl:
Area of tin turned in on itself to provide a safe, finished curved edge
Drawn:
See seamless
End:
The area of a tin also known as the bottom. Coffee-style hermetic tins generally have two ends. Ends can be attached by seaming them on or crimping
Hem:
similar to a curl, an area of tin turned in on itself to provide a safe, finished flattened edge
Lock-seam:
Side walls meet and attach by hooking onto one another to form a tin body
Seamless:
A tin that is constructed from a single piece of tin drawn to form the body of the can
Stepped cover:
Type of slip cover in which a “step” is created between the horizontal surface and vertical surface of the cover so that stacking tins is possible with less likelihood of toppling over
Welded Seam:
Seam type in which side walls attach to one another through the use of heat to form a tin body
Body:
A can without a cover (lid); the base of a container
Cover:
A can’s lid or closure
Dome:
A type of cover characterized by a flat horizontal surface (top) that tapers smoothly onto the skirt (vertical surface)
Full friction:
a plug-style metal cap fits snugly to the interior of the can
Interior Friction:
Cover/closure option in which a pliable ring fits to the interior of a tin allowing for a straight-sided slender profile can
Multiple friction:
A plug closure fits into a “well” of a seamed-on ring. The plug is pressed into the ring and the two surfaces (the outside and inside edge) come into contact with the ring, creating multiple sealing surfaces on the plug/ring combination
Slip cover:
Cover/closure style in which the cover’s skirt (vertical surface) slips over and to the outside of the can body
Single friction:
A plug-style metal cap fits snugly into a seamed on ring. The outside edge of the plug presses against the interior edge of the ring, creating one sealing surface
White Coat:
Entire surface of the metal is coated with white before applying other printing ink colors