A Short Guide to Can Sealing Machines

Can sealing machines, also known as can seaming machines, are used to create hermetic seals on various containers. While the container’s body can be made from different materials, the lids are normally made of tin-plated steel. The containers can be:

  • Paper cans
  • Tin cans
  • Aluminum cans
  • PET cans
  • Plastic cans
  • Glass cans
  • Pots
  • Jars

Moreover, can seamers can be automated to streamline the packaging process which improves production efficiency and saves on labor costs. Aside from these, there are other benefits of integrating an automated packaging machine in your production line.

To help you learn more about can seamers, this short guide will be discussing the following:

  • Common classifications of can sealing machines
  • Major parts of can sealing machines
  • How can sealing machines work

So keep on reading if you are interested!

Classifications of a Can Sealing Machine

According to Machine Automation

Fully Automatic Can Sealing Machines

Fully automatic can sealers do not need much interaction with the operator. This is because the majority of the processes are performed automatically. They are recommended for enterprises with high production requirements.

Semi-Automatic Can Sealing Machines

Unlike fully automatic can sealers, semi-automatic can sealers will need an operator to initiate the sealing process. These machines will normally use a foot or finger switch to start each sealing cycle.

According to Machine Design

Rotary Machine Designs

In rotary can sealing machines, the containers will spin while the machine performs the sealing process. Fully automatic can sealers usually come in rotary designs which allow them to have faster production speeds.

Non-Rotary Machine Designs

Contrastingly, non-rotary can seamers allow the containers to remain stationary while they perform the sealing process. Thus, avoiding any damage to the containers being sealed and also the products inside them. This makes non-rotary can sealers ideal for liquid products because these machines prevent spilling.

Major Parts of a Can Sealing Machine

#1 Seamer Head

Also known as the seamer chuck, this component holds the container’s lid tightly and supports it from the seaming rollers’ pressure. 

#2 Seamer Turntable

This is a spring-loaded disc that gives support to the container’s body while it is being sealed. It spins freely during the sealing process.

#3 Seaming Rollers

A can sealing machine consists of two seaming rollers with concave profiles. These are where the flanges of the can’s lid are fed during the sealing process.

#4 Vacuum Room

For vacuum can seamers, they will have a vacuum room in which the removal of the oxygen from the containers is performed.

How A Can Sealing Machine Works

Before proceeding to this section further, it might help you if you read a bit about these double seam terms first.

Let us now start with how a can sealing machine works. A can seamer creates reliable double seams to ensure that no product leaks will happen. They attach a lid to a can’s body in three operation stages as will be discussed in the following sections.

Stage 1. Compression

This stage will provide the necessary force in holding the container against the seamer chuck. The seamer chuck holds the lid in place, which will later be attached to the body of the can. This happens while the turntable directs the can body upwards until it reaches the chuck. Note that for vacuum can seamers, the removal of the oxygen inside the containers takes place first before the sealing process.

Once the lid is put on top of the can, the double seaming process starts which interlocks the flanges of the lid with the can body. This double seam is done in two roller operations: first and second roller operations. 

Stage 2. First Roller Operation

This stage is crucial as the result will have a great impact on the integrity of the double seam. In this operation, the following processes take place:

  • The first roller pushes the lid’s flange causing it to turn around the can body’s flange.
  • The flange of the can’s body follows as the first roller moves closer to the chuck.
  • The lid now interlocks with the can’s body but the seal is still a loose one.

Stage 3. Second Roller Operation

  • The second seaming roller irons out the loose double seam from the first roller operation. This ensures a tight seal by compressing the interlocked flanges of the lid and can.
  • The machine squeezes a sealing compound into the open spaces in the double seam to finish off the hermetic seal. This sealing compound guarantees the protection of the can from contaminants and leaks.

Having a little bit of knowledge about your can sealing machines can be beneficial in the long run. They can help you easily determine the cause of problems in case complications in the machine will occur. Plus, they will guide you in finding your ideal can sealer machine that will fit your production line’s specific needs. Hopefully, this short guide was able to help you have an idea of the basic principles of can sealer machines.