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I received this question over the weekend… Jason A friend of mine recommended I get a spotting press for the molding department. What are their uses and should I consider getting one? My Response A spotting press is great for checking the parting line. This is a large hydraulic press specifically designed to open and […]

I received this question form a colleague through Linked-In last week… Colleague How do I calculate the flow rate of the polymer from the known gate cross-section area? My Response The formula for the appearant shear rate through a rectangular gate is as follows: Appearant Shear Rate = (6 x Q) / (W x H x H) Q […]

I received this question the other day… AS We are having problems with material leakage between the nozzle and the sprue. Is there some way we can adjust this? Note: after some further questioning, it was determined that sprue break was not being used, the nozzle position has been aligned, and the diameter and radius are correct. […]

I received this question on our online chat feature earlier today… Agustin Can you please give me the IR (intensification ratio) for an electric molding machine? My Response Electric molding machines do not have intensification ratios because they lack hydraulic pressure. Your machine should be configured to provide the actual injection pressure. Basically, an electric […]

This question highlights an often overlooked concern when using pressure sensors mounted underneath ejector pins. Milan How much of a gap should be used between the pressure sensor and the ejector pin? My Response The general recommendation from most manufacturers is between 0.25-0.5mm or 0.010-0.020in. In reality, this specification refers to the clearance between the top of […]