{"id":37266,"date":"2025-04-15T12:58:44","date_gmt":"2025-04-15T12:58:44","guid":{"rendered":"https:\/\/aso-labor.de\/branchen\/polymers\/injection-molding-defects\/"},"modified":"2026-01-26T00:17:50","modified_gmt":"2026-01-26T00:17:50","slug":"injection-molding-defects","status":"publish","type":"branchen","link":"https:\/\/aso-labor.de\/en\/industries\/plastics\/injection-molding-defects\/","title":{"rendered":"Injection Molding Defects"},"content":{"rendered":"\t\t
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Injection Molding Defects<\/h1>\t\t\t\t<\/div>\n\t\t\t\t
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Failure Analysis of Injection Molded Parts<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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Solution Viscosity \u2013 Viscosity Number and Intrinsic Viscosity<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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Various molding defects can occur during injection molding, such as streaks, sink marks, blistering, weld lines, gloss variations, matte spots, warpage, etc. Some affect the visual appearance and can lead to complaints, while others degrade mechanical properties and can even lead to premature failure.<\/p>

This can also negatively impact further processing, such as electroplating.<\/p>

Failure analysis of injection molding defects begins with defect classification based on features on the component surface or cross-sectional examinations. By identifying various defect characteristics, the physical causes can be narrowed down. An analysis of influencing factors provides insights for defect reduction or prevention by adjusting processing parameters. Our specialized testing laboratory for plastics analyzes damage cases in injection molded parts. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Defects in Plastic Electroplating<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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PC\/ABS materials are now mostly used for plastic electroplating. The quality of electroplated plastic surfaces is also influenced by the manufacturing conditions of the plastic parts themselves. Increased reject rates often occur due to pimples, pinholes, blisters or insufficient layer adhesion. The causes of these defects can be found both in the injection molding process and in the electroplating process.<\/span><\/p>

Injection molding defects on the raw part are usually also visible on the finished electroplated component. However, hidden defects not observed on the raw part can be amplified and thus become visible during the electroplating process. Additionally, defect patterns can arise from deposition irregularities in electroplating, aging of baths, or unsuitable electroplating conditions. <\/span><\/p>

A systematic, microscopic analysis of the finished part and the raw part helps to determine the cause of defects in electroplated plastic parts and reduce rejection rates.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Contamination of Components<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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Contamination can occur at every process step, from raw materials to transport. Various spectroscopic and microscopic methods are used for failure analysis depending on the type of contamination. <\/p>

For liquid raw materials, NMR spectroscopy is recommended for detecting organic impurities, while XRF spectroscopy is suitable for inorganic trace impurities.<\/p>

For surface contamination, scanning electron microscopy and IR spectroscopy are used to analyze the defects. The composition and morphology of the contamination provide clues about its origin. Some contaminations are invisible but can cause problems during further processing. Specially adapted investigation methods are required here. <\/p>

A systematic failure analysis enables the characterization and determination of the causes of contamination on plastic parts, which contributes to reducing rejection rates. Our failure analysis, tailored to your requirements, can help with this. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Application Examples<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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<\/path><\/svg><\/span>Flow Line Analysis Injection Molding<\/span><\/a><\/i><\/span><\/i><\/span><\/span><\/h3>

Injection Molded Parts \u2013 a Detailed Look<\/h4>\n

Problem Statement<\/h5>\n

During injection molding and thermal forming of polymers, it is necessary to optimize the polymer flow. Only in this way can all corners and edges be sufficiently supplied with polymer, and weak points in the component due to unsuitable processing conditions be avoided. <\/p>\n

Solution<\/h5>\n

In such cases, Analytik Service Obernburg GmbH creates microtome cross-sections through the areas of interest and uses special imaging methods of light microscopy to visualize the flow lines in the polymer.<\/p>\n