How do I check that a can seam is correct?

The answer

Inspect and measure it, rather than trusting the machine. A seam is checked against a specification — typically seam thickness and body hook measurements — using a gauge and a written procedure. Ask whether the gauge is supplied with the machine and whether a documented seam-check procedure is provided.

In more detail

Can seaming is unforgiving: a bad seam leaks, and a leak found after the product has been packed is a total loss. That is why the check procedure matters more than the automation level.

A seam is verified by measurement against a specification, not by looking at it. The usual measurements are seam thickness and the body hook dimension, taken with a seam gauge, plus a visual check for the specific defects that indicate a badly set roller. This requires a written procedure, because the person running the check has to know which figures are acceptable.

So when you specify a can seamer, ask for the seam gauge and the inspection procedure. Ask whether the gauge is supplied or has to be sourced separately, and ask what the specified seam dimensions are for your can size. Then ask about the wear parts — the rollers and chucks that do the work — and whether change parts for each can size are available.

None of this depends on whether the machine is manual or automatic. A correctly set semi-automatic machine can produce a good seam; an automatic machine that is never verified can produce a bad one.

Confirm before acting

Whether a seam gauge is supplied with the machine
Whether a written seam inspection procedure is provided
The specified seam dimensions for your can size
Roller and chuck availability as spare parts
Change parts for each can size you run

Related configurations

Automatic Can Seamer

Sealing & Packaging

6 supplier routes

View configuration →

Semi-Automatic Can Seamer

Sealing & Packaging

2 supplier routes

View configuration →

Should I buy a manual or an automatic can seamer?

The decision is output against changeover. A manual or semi-automatic seamer is slower but changes can sizes quickly, which suits craft production and multiple SKUs. An automatic seamer runs steadily with less operator dependence, but changeover takes longer and it only pays if volume justifies it.

What documents should I request from a supplier before ordering?

Request the documents that let you verify a claim, not a list of certificate names. A specification sheet, a declaration of conformity where applicable, a wear-parts list, a packing and loading plan, and the quotation with its exclusions stated. Each one should name the issuing party and be specific to your machine.

Another question?

Send the actual conditions — we will tell you what needs confirming first and which routes we can compare.

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