Carbon dioxide atmosphere modifiers for packaging

摘要

A sachet for maintaining or modifying the atmosphere in a package, the sachet including: (A) a moisture vapor activated chemical substance contained by two containing layers bonded together, and (B) at least one moisture absorbent layer immediately adjacent to, and bonded to at least one of the containing layers wherein each said absorbent layer is external, relative to the said containing layers and wherein each containing layer positioned adjacent to an absorbent layer is formed from microporous film. Fig 1. is a preferred example of the sachet. Package 1 indicates a container 2, a sachet 3. The sachet 3 includes containing layers 4 and 5 which hold a chemical 6. Layer 5 is micro-porous, allowing vapour to pass through it, but not allowing any liquid or solid material to pass through the layer. The chemicals may contain a CO2 releasing substance, or a combination of CO2 generating/oxygen absorbing substances which needs to be effectively separated from the package meat. The product 8 within the package is meat. The container 2 is sealed by two separate film layer 9 and 10. The sachet 3 also includes absorbing layer 7 which soaks up moisture. The moisture is then transferred from the absorbing layer 7 to permeate through the micro-porous layer 5 as water vapour activates chemical 6. The gas produced by the chemical 6 passes through the sachet 3 and into the package's atmosphere. This modifies the atmosphere allowing desired storage conditions for the meat.