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<p>When it comes to molding defects, <a href="http://www.moldclamps.net/Articledetails?article_id=195"><u>burn marks in injection molding</u></a> are some of the most common. Why have burn marks in injection molding?</p> <p>Burn marks in injection molding cause1: Melt fracture</p> <p>When the melt is injected into the large volume of the cavity at a high speed, high pressure, melt fracture phenomenon is easy to produce, at this time, the melt surface transverse rupture occur, the rupture</p>