Material Drying
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PA6 Product Bubbles
Problembeschreibung
Internal bubbles or surface blistering of the product, mostly occurring at thick walls, affecting appearance and strength.
Ursachenanalyse
Moisture vaporization into bubbles is the first cause; insufficient holding pressure at thick walls forms vacuum bubbles; excessively high melt temperature decomposition also produces gas; the three mechanisms need to be distinguished (moisture is often accompanied by silver streaks, and vacuum bubbles have smooth walls).
Lösung
①Strengthen drying and verify that the moisture content meets the standard with a moisture measurement method;②add holding pressure for thick-wall parts;③material temperature does not exceed the upper limit;④open or clean vent grooves at corresponding positions to ensure smooth gas discharge;⑤core-pull and reduce material at thick walls to reduce shrinkage from the source.
Wichtigste Erkenntnis
PA6 bubbles follow the three-way division of 'water, vacuum, decomposition': first verify drying, then look at holding pressure, and finally control temperature; moisture content of nylon material is the most common source of bubbles, and drying verification must come first.
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