Food Packaging Technology

A retort pouch laminate comprises an outer $12\text{ \mu m}$ PET layer, an adhesive tie layer of $3\text{ \mu m}$, a $9\text{ \mu m}$ aluminum foil barrier, another adhesive tie layer of $3\text{ \mu m}$, and a $75\text{ \mu m}$ CPP inner seal layer. The total laminate thickness $12 + 3 + 9 + 3 + 75$ in micrometers ($\mu\text{m}$) is: