Seaming tins are circular, punch-pressed metal end closures, used on the tops and bottoms of Fiber Cans and Telescope Tubes.

The process of permanently applying a tin part to a paper tube is defined as “seaming.” Seaming tins are .007″ thick, or the thickness of 2-3 sheets of standard, white printer paper. The majority of seaming tins are plain and used because they are weight-bearing. Pringles potato chip canisters are a classic example.

While most are plain, some canisters have more specific uses and require the seaming tin to have holes or slots. Donation canisters have a coin slot in the top to allow people to drop coins into the canisters. As the canister gets filled, it becomes heavier, and so a plain seaming tin is often used on the bottom.

Using a coin-slotted seaming tin on the top helps ensure the donations will be kept safe while the plain seaming tin on the bottom keep the coins from falling out. Read more…