WebOct 4, 2024 · Knit lines are formed in injection molding when two flow fronts meet in the middle of a part (a line where two sides of the plastic are “knit” together). This most … WebDec 14, 2024 · A weld line refers to a line, notch or color change that is created on the molded part caused by the convergence of two separate flows of molten plastic. This occurs wherever there is a hole, notch, or any other feature on a part which divides the flow of plastic into 2 separate “flow fronts.”

Cosmetic Appearance on Injection-Molded Plastic Parts - Protolabs

WebKnit lines, weld lines, mold lines, or flow lines in injection molding are faint lines that become visible on certain plastic parts. Weld lines may appear like seams or scratches, … WebA knit line is any line, visible or not, where two resin flows meet (see Figure 2). Depending on the design of the mold and the material being injected, a knit line may present no problem at all, may be a cosmetic issue, or can cause a potentially serious structural problem. peckers chicken

Weld Line (Knit Lines) in Injection Molding

WebKnit lines can be defined as the inability of two or more flow fronts to ``knit'' together, or "weld", during the molding process. This normally occurs around holes or obstructions and causes locally weak areas in the molded part. Some common causes and … WebKnit lines are considered molding defects, and occur when the mold or/and material temperatures are set too low: thus the materials will be cold when they meet, so that they … peckers chicken hitchin