how Tg effect the characterstics of food packaging films? which is the best Tg for selection of packafing film?
Tg is important to the extent that it influences properties such as heat sealability, mechanical properties and permeability.
thank u sir, i want to know how it effect the film forming ability of thermoplastic polymers?
Perhaps have a look at some of the technical guides that are on the web:
http://www.qenos.com/internet/home.nsf/(LUImages)/TG3Film/$File/TG3Film.pdf
What foods are you trying to package and what forms are you going to use?
The most widely used film for packaging is polyethylene ( LDPE,LLDPE etc)
Tg is very low (-80). Not an important consideration in most "flexible Film packaging". Next most used is polypropylene same thing not too important as they are used in the "rubbery phase" and way above Tg. Some forms of PP have Tg around 0C depending on application ( cold o frozen) then it is important to consider.
If use is at very low temperatures then Tg might be important o reduce risk of brittleness. If you are going to thermoform then you'd like to be above the Tg.
If you are injecting then Tg would determine your cooling before ejection.
If you refine you question you may get a more specific answer, as your question above is is too broad
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