I just received this question… Vishal How do I estimate the cooling time? I located a chart referencing a proportionality constant of a polymer, is this the right way? My Response There are many helpful charts and factors, but these use too many assumptions and are just ways to avoid proper circulations. Proper cooling time estimations contain the […]
Monthly Archives
July 2010
Approaching Training With Your Employees…
I was asked this question during a recent on-site visit… Kevin How do I discuss training with my employees in a manner which makes them accepting? My Response When discussing employee training, it is critical to focus on how it will affect the employees. For example, if operators are not involved in the training initiative […]
Getting a Spotting Press…
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 […]
Calculating Apparent Shear Rate…
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 […]
Problems with Drool…
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. […]