Hesitation effect — also known as flow hesitation or stagnation — occurs when the melt front slows down or stops at thin sections (such as ribs or thin walls) during cavity filling. The melt prefers...
Stress whitening is a common surface defect in injection molded parts. It appears as a white or silvery discoloration on the part surface, typically near ejector pin marks, sharp corners, or areas of ...
The temperature duiring ejection of a molded part directly determines the molding cycle. A higher temperature duiring ejection means the part spends less time in the mold — cycle time shortens and pr...
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...
English 
français 
Deutsch 
Español 
italiano 
русский 
português 
العربية 
dansk 
Suomi 
Svenska 
norsk 
