Differences between CPP & BOPP

I want to know the basic operating & quality difference between PET & CPP metallizing?  What are the factors affecting CPP metallization in addition to PET metallizing?  How one can improve the CPP metallization process?

ANSWER

I do not have any direct experience of metallizing CPP films but can possibly give some insight into the difference in the materials.

CPP stands for Cast PolyPropylene film.  This generally means that it has not been oriented and so the tensile performance is less than the oriented polypropylene and so it will withstand less tension being applied during the metallization process before the film distorts. Thus it is likely to require more care and a slower deposition rate and heat load than the equivalent oriented polypropylene. The PET will almost certainly be oriented and so this too will have enhanced tensile properties in the directions of the orientation making it much better for pulling tension around the deposition drum to help take out the temperature during deposition. Thus I would expect the PET to run through any metallizer faster and with fewer handling problems than any CPP film.

As the CPP is likely to be more heat sensitive I would try to make sure that any heat load is managed as well as possible. I would aim to be using the gas injection system between the web and deposition drum to make sure the heat transfer coefficient is as high as possible whatever the tension is set at.

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What are the key properties of CPP which is using for metallizing film ?
Thank you very much.