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Category Archives: Quality
Dec26
The Relationship Between MFI and Re-grind/Recycle Resin in Plastics
When discussing whether using re-grind resin in plastics leads to degradation, Workingbear sought advice from industry experts. Most professionals agreed that it does cause degradation. However, opinions on whether MFI values can reliably indicate the presence of re-grind resin are … Continue reading
Dec19
7 Ways to Identify if a Plastic Factory is Using Re-grind Resin
It’s an open secret in the plastic injection molding industry that re-grind resin is often added during injection. Some manufacturers even claim that, given the current competitive environment and cost-cutting pressures, it’s impossible to make a profit without using some … Continue reading
Dec12
Why Re-grind Resin in Plastic Injection Molding Causes Degradation and Weakens Strength
The use of re-grind resin and recycled material in plastic injection molding is a persistent challenge for engineers. The more re-grind resin or recycled material is added, the more severe the degradation of the plastic becomes. This degradation weakens the … Continue reading
Dec05
7 Common Reasons for Elevated MFI (Melt Flow Index) in Plastic Resin Testing
Workingbear’s company recently encountered a quality issue with a plastic product. The problem was, “Why is it that products made from the same type of plastic resin sometimes show normal MFI (Melt Flow Index) values, while others have unusually high … Continue reading
Oct24
Causes and Prevention of PCB Warping and Bending After Reflow
A reader recently asked: “In surface mount assembly, PCBs often warp or bend after going through the reflow process, which can cause issues like open solder joints or tombstoning. How can we overcome this?” To be honest, the reasons behind … Continue reading
