Sprue breakage is a common issue in injection molding. When the sprue — the solidified material in the main flow channel — breaks off during ejection, it can cause production delays and even mold da...
Sticking parts are a common frustration in injection molding. When the molded part refuses to release cleanly from the cavity, it slows down production and can damage both the part and the mold. This ...
Flash at the parting line is one of the most common defects in injection molding. It appears as a thin layer of excess material protruding from the mold split line, as shown in the Figure, and it can ...
The screw is the heart of the plasticizing unit. Choosing the right one directly affects melt quality, cycle stability, and part performance. So how do you decide?It comes down to one question: how do...
Bubbles trapped inside plastic parts can cause circular protrusions on the surface, as shown in the Figure. These voids can occur not only in thick wall sections but also in other areas, with varying ...
Gloss marks — also known as stress shadows or burnish marks — are localized shiny spots on the surface of injection molded parts. They are a form of stress concentration and typically appear as glos...
Silver streaks (also known as silver marks or mica marks) are spray‑like blemishes that appear on the surface of molded parts, radiating outward from the gate in a fan‑shaped pattern, as shown in th...
Weld lines form where two melt fronts meet inside the mold cavity. Long flow paths cause the melt to cool, and trapped air prevents proper fusion, resulting in weak, visible lines. This article outlin...
Injection pressure is the force that pushes molten plastic through the nozzle, runners, and cavity. It overcomes flow resistance and also compacts the melt to compensate for shrinkage. The pressure va...
Surface peeling ( Delamination) is a common defect in injection molded parts, where thin layers separate from the surface. Understanding the root causes is essential for producing high‑quality parts....
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