1 Head Machines
Used 1 Head Equipment
The term “can” refers to a container with a roll seamed lid, also called an end. Cans may be steel or aluminum, plastic, board or composite material. There may be 2 pieces with the body and one end formed of a single piece or 3 pieces with both ends seamed. They may have a straight sided, tapered or shaped profile. They are usually round but specialized machines can
They are usually round but specialized machines can seam oval, square or other shapes. Can seaming machines run at speeds from a few cans per minute to several thousand. 1 head machines typically run at speeds up to 90cpm maximum depending on can and lid.
Cans enter the seaming machine single file. They are synchronized with the seaming head via lug chain, starwheel or timing screw.
Once under the seaming head the lid is mechanically “seamed” to the can body in a 4 step process. Once sealed, cans can only be opened by cutting the seam, end or body. This makes cans highly tamper resistant.
The can seaming process is:
1 – The can end is placed on the can body. Some can seamers do this before the can comes into the seaming station. Others, especially 1 head seamers, Shuttle the end horizontally out of a magazine and onto the can body when it is in the seaming station.
2 – It is generally easier to raise the can into the seaming rolls than lower the rolls onto the can. After the can and lid have been indexed under the seaming head it is pushed up against the pressure block. This pushes the body and lid tightly together.
Some seamers rotate the can against the seaming rolls. An alternative is to have the rolls in a large, spinning head which allows the can to remain stationary.
3 – The first seaming roll is pressed against the end. This causes the edge of the end to roll over the body flange forming a “hook”. At this point, the end and body are loosely joined.
4 – The second seaming roll irons the seam flat. This forces a tight seal between body and end. After the second seaming, the can is lowered and indexed out of the seamer.
Can seaming is a proven and inexpensive technology. It provides a rugged and tamper-proof container for virtually any product.