Bulb formation MAP-packaging poultry

Hi all,

Our company core business is slaughtering chicken and selling the processed meat.

Recently we received a complaint regarding a bulb forming in a MAP-packaging of chicken fillet see picture.

Our gas mixture is 30% CO2 and 70% O2.

Someone any idea why we have a bulb forming?

We give 9 days for modified atmosphere packaging.

Could be a result of microbial activity?

Greetings,

Dolf

please try again, the attachment isn't here

Your gas flushing with oxygen (O2) and Carbon Dioxide(CO2) correct?  You're packing ground and/or dark meat only?