Can I use CPP in low temperature packaging applications?
In technical terms, the Glass Transition Temperature (the temperature at which a material’s mechanical properties start to behave like glass) for all polypropylene based film materials is approximately 380F. Below this temperature, polypropylene films lose their impact strength and may mechanically fail if subjected to excessive handling. Therefore, generally speaking, CPP in a monofilm structure is not recommended for packaging applications where the normal exposed ambient temperature could drop below 380F. However, CPP has been used quite successfully in multi-web laminations for low temperature packaging applications even including frozen food packaging. In these instances, the CPP is generally the outside (non sealant) web of the packaging structure with the bulk of the laminate structure composed of a low temperature friendly material such as LDPE.
