I received this as a follow-up question for a previous blog posting on The Future of Plastics… Ed We are adding a new machine this year and we are looking at a electric machine. Our biggest concern with electric is the hold time. Due to our thick wall parts we use extended hold times. Does anyone have any […]
Category Archives
Plastics Technology
Can Low Melt Temperature Cause Flash?
Yesterday, I was asked this question… GH My tech told me that we were getting flash as a result of a low barrel temperature. An increase in barrel temperature fixed the problem, but I don’t know why, could you explain? My Response It may seem counter-intuitive, but flash could be the result of a low melt temperature or […]
Plastic vs. Plastics…
While consulting, a technician asked me this question yesterday… John I’m confused, are we making parts out of ‘plastic’ or ‘plastics’. Which is correct? What is the difference? My Response The word ‘Plastic’ refers to something which is flexible or malleable. Although most synthetic polymers are flexible, there are a many materials which also have these properties including lead, […]
What is Desiccant Regeneration…?
I often get asked about desiccant, and how regeneration works. This entry will explain the basics of the desiccant dryer and the regeneration cycle. Desiccant Bed The desiccant bed contains pellets or granules that absorb moisture. These pellets are commonly known as molecular sieves. These molecular sieves have a strong molecular attraction to water which allows it to efficiently […]
Can Gas Entrapment Cause Poor Surface Finish?
An engineer emailed me this question yesterday,,, John My setup technician believes gas entrapment is the cause for poor surface finish on a particular process. When we clean the vents, the appearance improves, but does this make sense, or is there something else causing this? My Response Although most people associate burning or dieseling with […]