The purpose of conditioning is to ensure the polymer chains are in a consistent state to ensure the testing is objective. The orientation, crystallinity, strength, and impact resistance of polymers can be easily influenced through conditioning. Question: My company deals with polymer compounding and we have an testing lab. According to ISO 291, we are required […]
Monthly Archives
May 2013
Scientific Molding vs. In-Mold Labelling
A good in-mold labeling process must be reliable and consistent to ensure each part and cavity receives the same amount of pressure. Scientific Molding provides the basis for developing a robust and reliable injection molded part to which the label will adhere. Question: I am working at a location where in mold labeling is growing. […]
Converting Percentage to Pressure
It is relatively easy to convert a percentage setting on your controller to the actual pressure applied to the plastic. The most important factor is that you need to know the maximum pressure capacity. Question: How do I convert a pressure measurement which is provided in percentage? When the panel says 50%, what is that […]
Documentation without 1st Stage Short
Essentially, you cannot generate reliable machine independent process documentation based on process outputs if the mold cavity fills completely during 1st stage injection. Problem: I see many companies trying to utilize machine-independent process documentation while still filling the cavity completely during 1st stage injection. Since the mold cavity is both filled and packed during first stage injection it […]
Glass-Filled Nylon with Regrind
Since the regrind has variable sized pieces, additional drying time may be necessary to ensure the thicker chunks are fully dried. The regrind process results in irregular-sized pieces which have different cross sections. Question: Most of our parts use an industrial grade resin ( recycled PA with GF) and often with 20% of regrind resin. […]