News /

The world of flexible packaging

1 April 2019

Flexible packaging

As we move into a world where we see more flexible food packaging replacing traditional glass and metal options, we need to become more aware of how the structure of the packaging will impact the shelf life of food.

Some of the terms:

Oxygen transition rate (OTR) is the rate in which oxygen permeates through a film, the lower the OTR, the higher the barrier. WVTR or Water vapor transition rate is how quickly water vapor will transfer through a film.

Why is the above important?
OTR is the way in which we restrict aerobic microbiological activity food where as WVTR controls the moisture retention in a packaged product.

As the name suggests a laminated film is constructed by layering the different plastic polymers which come together to provide the features of film such as the barrier, flexibility, clarity, strength and seal-ability where as co-extruded film is where the differing plastic polymers are melted and blown together into the finished film thickness. The composition of the film will affect the barrier properties, flexibility and clarity of a film, for example, a film which has a layer of aluminium or nylon will improve the barrier proprieties of a film.

The right option for you?

This will depend on your application, what type of seal, shelf life, visual impact, strength and structure of the packaging you require.

Common polymers used in flexible packaging:

PE - Polyethylene
PP- Polypropylene
PA - Polyamide
EVOH - Ethylene-vinyl
EAA - Ethylene and Acrylic Acid
EVA- Ethylene-vinyl Acetate

When it comes to the perfect solution to hot or cold fill your product, REGETHERMIC offer both a Vertical Form Filler for automated filling and the REGETHERMIC mobile pump-fill station for a semi-automated filling option.