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Author Archives: WorkingBear
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
Nov28
Understanding Melt Flow Index (MFI) for Quality Control in Plastic Injection Molding
The “Melt Flow Index” (MFI) of plastic refers to the weight (in grams) of molten plastic that flows through a standardized tube with a specific diameter under a defined load (in kilograms) and temperature (in °C) within a set period … Continue reading
Nov21
What Are PCB Cross-out Boards (X-out Boards)?
In the PCB industry, there is a specific term called “Cross-out boards” or “X-out boards” to indicate that a panel of PCBs contains defective boards. The term “Cross” refers to marking these defective boards with an “X” symbol.
Nov07
The Benefits of Using “Mirrored Panelization” for PCBs
In the electronics assembly manufacturing industry, what we commonly refer to as a “Mirrored Panel Board” or “Flipped Panel Board” actually comes in two types. The first type is a different-side mirrored panel board, where one board’s top side and … Continue reading
