Category Archives

This interesting query was emailed to me the other week… JM Plastic vs Brass Baffles?  Do spiral baffles add any cooling efficiency? My Response The plastic baffles are new, and the jury is out… I can see the obvious benefit of not stressing the mold base as they are installed, as well as the textured […]

I was asked this question via email the other day… JP We process a large amount of amorphous polymers including ABS, PS, and PC. We are looking to purchase come new screws for these materials, the screw manufacturer suggests using nearly half the screw for the transition zone, does this make sense? If so, Why? […]

This was a second part of a question I received the other day… Jim What is the standard baffle length to baffle channel length?  How much clearance at the between end of baffle and bottom of channel? My Response There is no standard for baffle length, though it is critical that you balance the baffle flow (and […]

This question came via email this morning… Jim What is the effect of scale build up/rust build up on cooling channels? My Response The actual losses in efficiency are due to the difference in heat transfer from scale and the mold base material. Therefore, the more conductive the tool steel, the more the scaling will […]

I received a few questions from a blog reader the other day, this is one of them… Nathan Regarding the Cavity Balance Test – which is preferable, 50% or 90% full. note: this test uses different injection speeds to determine which provides the most balanced fill during a 1st stage short shot. My Response It is preferable to use a […]