Reliable and durable, plastics made using China injection molds are suitable for applications involving heavy use or exposure to extreme conditions. However, certain issues can affect the quality and longevity of these products, with weld lines being a notable concern.
Weld lines, also known as knit lines, are imperfections that occur in places like edges, corners, and angles within the mold. During injection molding, thermoplastic material is melted and injected into a double-sided custom mold. As it cools and solidifies, taking the shape of the mold, weld lines can form at the points where separate flows of melted material converge and knit together. This often happens when molten plastic encounters obstructions in the mold, causing it to split and then rejoin, potentially forming air pockets or weak points if not properly fused. The importance of addressing weld lines While weld lines in China injection molds may appear as mere cosmetic issues, they can create weak points in the product. This is because the polymers don’t fully bond to bridge gaps, affecting the overall integrity of the item. Strategies to avoid weld lines Preventing weld lines is crucialas they can't be corrected post-manufacturing. Here are some effective ways to avoid them during the injection molding process:
Source URL: www.hlhprototypes.com/weld-lines-in-plastic-injection-molding-what-they-are-and-how-to-avoid-them/
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AuthorHLH Prototypes Co. Ltd. Provides rapid part manufacturing solutions like 3D printing, CNC machining, rapid tooling, rapid injection molding, and SLS 3D printing service, vacuum casting (urethane), and sheet metal work. Categories |