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This question arrived as a follow-up to a previous post: More About Back Pressure… Saylan If I have to work with an odd back pressure like 250 bar, does it create any damage to the equipment or machine? My Response Assuming this is the plastic pressure, this would not necessarily cause machine damage. This will consume […]

This question was received earlier this week… CD What should be the minimum pressure during switch over time of injection? My Response If you are switching over through the use of screw position, then you should ensure the maximum pressure setting is significantly higher than injection pressure at transfer. Additional Thoughts It is critical that you have enough pressure […]

In a comment thread in a previous blog entry, a reader had some questions about how to handle the transfer from 1st to 2nd stage transfer. The basic focus of the discussion both in the comments as well as private were about a general approach to establishing the transfer, yet they have many different types and brands […]

I was recently asked about back pressure… GG My employees were asking me to explain the following statement ‘Back pressure causes additional material to flow over the flights of the screw’. I wanted to hear your explanation before discussing it with them. My Response During screw recovery, the screw is pumping material forward down the flights of […]

I was recently at a molder’s facility who was having a complication with one part… Molder Even though this polypropylene part has a curve, we have a problem with it curving too much thus causing a complication with assembly. note: when discussing the troubleshooting process, they have investigated most aspects of the process, but it […]