Degradation or residence time limit for plastics

By Raja Iruthayaraj
Published: July 6th, 2009

Hello Team,

Can i get a details about - How to determine the degradation or residence time limit for a particualr polymer?Specially while using injection molding application.

Thanks in Advance.

Raja.I

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Thank you very much for your

Submitted by raja_i1992 on July 29, 2009 - 4:57am.

Thank you very much for your practical oriented comment Mr,Syedtar

Raja Jee: Use 40%min of

Submitted by syedtar on July 20, 2009 - 1:44pm.

Raja Jee:

Use 40%min of barrel per shot and good molding practices.

U can ask for data from resin supplier but it could be from rheometer (shear may not be the same as in molding m/c) or TGA (no shear). Therefore, you have to be careful with the data.

Thank you very much for your

Submitted by raja_i1992 on July 9, 2009 - 4:47am.

Thank you very much for your kind reply Brent.

The resin manufacturers

Submitted by BrentBorgerson on July 7, 2009 - 10:58am.

The resin manufacturers publish this data, as each resin differs. Even resins of the same class can differ due to additives.

Contact the resin maker or their website. You will have to do some simple math calculations involving shot weight,cycle time and barrel/melt (and hot runner if present) capacity.

Remember data assumes correct and HR barrel temps.

Good luck and keep molding!

brent

www.matrixtooling.com