WebbEdit. View history. Tools. In manufacturing, the Weld line or Knit line or Meld line is the line where two flow fronts meet when there is the inability of two or more flow fronts to "knit" together, or "weld", during the molding process. These lines usually occur around holes or obstructions and cause locally weak areas in the molded part. [1] WebbThey are also known as flow lines. Flow marks mainly occur in the form of circles or lines. These marks will be evident after the product has cooled. They show nonuniformity in the flow pattern as it enters the mold. The temperature gradient within the melt is what causes this nonuniformity in the flow.
What Causes Flow Lines in Injection Molding and How to Avoid …
WebbFlow marks, also known as flow lines, are molding defects that can occur in the manufacturing process of injection molding. They are best described as "off tone" wavy lines/streaks or patterns in the molded part around the injection ports. Webb21 maj 2024 · Common Injection Mold Flow Lines 1. Snake Flow Lines. When the depth of the gate is much smaller than that of the cavity entrance, and the filling rate... 2. Wave Lines. In the process of melt filling, the new melt flow is continuously pressed out from … fisher xp-5 speakers
Coping with Weak Weld Lines Plastics Technology
WebbInsufficient injection pressure and speed can cause weld lines. Flow Line Phenomenon: Surface defect in which wavy streaks form like a ripple centered around the gate. Possible causes: Low temperature of injected melted plastic or slow injection speed during injection molding resulting in low fluidity of plastic inside the mold. WebbDec 2005 - Nov 202413 years. Cochin Area, India. •As department Head, responsible for complete functioning of 2 departments. ( Technical and … Webb3 jan. 2024 · A wide variety of defects can occur when it comes to plastic injection molding. Bright and dull bands that spread out and repeat in a direction perpendicular to the flow direction are called flow line defects. Flow lines (or flow marks) can frequently happen for a range of causes and in various kinds of polymers. can a ny notary notarize for family members