What is a Gas Flush on a Vacuum Sealer?

The gas flush feature is commonly found in some types of packaging machines, such as those used in tray sealers or modified atmosphere packaging (MAP). Used to introduce shielding gas into the package prior to sealing, instead of removing air like vacuum sealers do.

Here's how the gas flushing process works in conjunction with a packaging machine:

1. Product placement

The products to be packed are placed in trays or containers, which are then placed on the packaging machine.

2. Gas injection

A gas flush function is used to introduce a gas mixture (usually nitrogen, carbon dioxide or a mixture of gases) into the package prior to sealing. This gas mixture replaces the oxygen inside the package, creating a modified atmosphere.

3. Seal

After the gas flush, the packaging machine continues to seal the package, creating an airtight and strong seal. The modified atmosphere inside the packaging helps to extend the shelf life of the product.

What is the purpose of the gas flush function?

The purpose of the gas flush feature is to create a modified atmosphere inside the packaging to maintain the quality, freshness and shelf life of the product. The specific gas mixture and concentration used depends on the type of product being packaged and its unique preservation requirements.