Injection Moulding powers the production of everything from car dashboards to medical devices, but somehow even experienced teams still hit quality trouble. One defect and suddenly it is scrap, delays, and customers that are, like, really not happy. Working with trusted Injection Mold Manufacturers in China such as xiongzhigroup.com helps cut down those risks from day one, because the tooling is precise, and the process control stays tight. So, let’s sort out the most common defects, why they pop up, and how to stop them before they snowball. Sink Marks and Voids Sink marks are those small dimples on the surface of a part, usually sitting above thick ribs or bosses. Voids are the less visible relative: hollow pockets trapped inside thick areas, quietly making the part weaker. Both seem unrelated, but they come from the same “root thing.” The outer skin of plastic cools and hardens first, while the inner core is still shrinking, and there just isn’t enough material packed in to compensate. The fix really starts with the design. Keeping wall thickness consistent, or coring out the thick zones, removes the issue at its source. On the machine side, raising packing pressure and holding time, increasing the gate size, and letting the part cool a bit longer helps the cavity pack out properly. For voids in moisture-sensitive resins like nylon and polycarbonate, drying the material correctly before processing is also part of the deal, no shortcuts. Warpage
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