06-12-2014 02:40 PM
How can affect the temperature of the mold (mold cooling) in a flavor transmission problem to the finished piece?
The mold temperature influence within the process
We have a problem with an application where the end customer is occasionally find some pieces that transmitted taste like plastic.
The piece is obviously for food contain and must pass some differents processes during the manufacture like a heat temperatures and later frost temperatures.
We are talking about a PP Copolymer mixed with % of Masterbach.
So, is possible that the influence of the mold temperature is driving me crazy?
All comments in order to find the root of the problem are welcome.
Thanks and greetings to everyone!
06-12-2014 05:12 PM
I think you are sure to use the food grade PP, Masterbach should be certificated for food grade too. The cooling of the mould could not be the problems. If the material in the injection machine with a so high melt temperature than it's normal temperature, it could has this taste. You have to consider the real raw material melt temperature in the injection machine was as the the raw material property files suggested, and it's better to use sensor to check the real plastic temperature. Sometimes the machine setting temperature was not the same as the real. Others I think keep the mould clean, each time put the mould on machine 60 shots before should not take part for final product. and make sure the ejectors grease not stick on the part. And the mold air vent was well cleaned each 8 hours during the injection molding on machine.
06-12-2014 07:40 PM
Mehul Thacker : Are you using RCPP grade of PP ? Normally, this grade does not give any problem in all articles used for food grade application.