- Double Seam —
- n. A hermetic seal or seam formed by
interlocking the edges (flanges) of both the cover (lid or end) and body of a
can.
v. To attach a cover to a can body by a method in which five
(5) thicknesses of plate are interlocked or folded and pressed firmly together.
(See Double Seam Formation, 1.010)
- Double Seamer —
- A machine or device used for forming a hermetic seal
between a can cover and a can body. Also called a seamer, sealer, or can
closing machine.
- Cover —
- Same as lid or end.
- First
Operation —
- The initial step in the formation of a double seam
wherein the cover flange is fed into the concave profile of a seam roll which
causes the cover flange to be partially rolled up and under the flange of the
can body.
- Second
Operation —
- The last step in the formation of a double seam wherein
the partially formed seam is further compressed and flattened against the side
of the container body, completing the hermetic seal.
- Change Parts —
- The chuck, base plate, and seam rolls which are required
for forming the seam on a specific can and end. Different change parts are
required when changing can sizes and/or styles.
- Chuck —
- A seamer part machined to fit snugly into the recessed
area or countersink of the can cover; a chuck centers the cover on the can body
and acts as an anvil against which the double seam is formed. Dixie chucks are
custom fabricated to fit your lid per samples you submit with your
order.
- Base Plate —
- A seamer part (platform) on which the can is supported
during the seaming operation; its purpose is to provide proper pressure when
raised into position and to provide a rotating base. Dixie base plates are
custom fabricated to fit your container per samples you submit with your
order.
- Seam Roll —
- A seamer part machined with a concave profile into which
the cover flange is fed during the seaming process thereby causing it to be
rolled under the flange of the can body. A first and second operation seam roll
are required, with the profile contour of the second operation seam roll being
more shallow to allow final compression of the seam. Seam roll profiles vary
based on can and end configurations and manufacturer's recommendations.
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