A recent commenter to our blog just e-mailed me this age old question regarding gate sizing… Larry If a molder is having trouble filling a mold, yet the process is not ‘pressure limited’, would opening the gates solve the problem? My Response I typically ask for more specifics, but in this case it is more about the […]
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Processing With Flame Retardant Polymers
This e-mail can to me recently regarding the complications associated with the processing of flame retardant materials… Nathan I am processing with PC/ABS C6600 FR grade material and it is difficult to maintain a consistent part quality. Recently I am getting gas marks and gas deposition on the mold surface after processing for a few hours. Proper […]
Establishing A Schedule For Machine Levelling
In a recent webinar, I received this question form one of our participants… Jason How often should my maintenance department level our injection molding machines? My Response It depends… but typically larger machines should be levelled every 6 months. The smaller machines tend to be more stable and rigid, requiring levelling every 12 months. What […]
Example: Calculating Clamp Tonnage
A customer of ours asked this great question the other day… Jim I am trying to determine, technically, what tonnage I need for a given job: Area of part & cold runner is 19 in.sq. Fill Pressure Actual (@ 1”/s fill speed) = 900psi hydraulic Hold/Pack Pressure Actual = 650psi hydraulic Intensification ratio for the […]
Time to Learn; Time to Save
A contributor at engineering.com posted an optimistic blog entry entitled ‘Time to Learn; Time to Save’. This entry addresses employment and professional development during recessionary times. Corporal Willy (excerpt) The worst time to do nothing is when nothing is being done. Economic Recovery is being talked about but when you are unemployed that can seem like […]