Inline Postgasser by Tetra Pak

Modified atmosphere packaging (MAP) is used for replacing ambient atmospheric air with inert gas in fat-containing powders during hygienic packaging. This prevents powder products from deteriorating and prolongs shelf life.

Historically known as Bulkpak 25, the Inline Postgasser by Tetra Pak is used for fat-containing powders packed into 25 kg powder bags or cartons with plastic inner liner.

The postgasser offers safe operation and can be integrated into new or existing filling lines with different levels of automation. It is installed immediately before airtight bag closing stations.

The order of operation is as follows: the line conveyor transports the bag to the postgassing station, and the bag is locked in place by the front and rear clamp plates. Postgasser probes go down into the powder; a plastic cover plate protects powder from external contamination and minimises powder exposure to the atmospheric air. Ambient air present in powder is evacuated by vacuum and replaced with an inert gas. The probes are then removed from the powder, the clamping plates are released and the bag can be transported to the airtight closing.

The postgasser has a minimal footprint and high throughput rate, and offers savings of inert gas and consistently low residual oxygen levels. It is claimed to eliminate the need for filter or valve attachments in the barrier liners. With all parts fabricated in stainless steel and food-grade materials, the postgasser is suitable for operation in cleanroom environments.

The postgasser can be installed in combination with one of the company’s Bulkpak Heat Sealers or any similar bag-closing equipment.