Sheet Metal · 2022年11月11日

What should I do if there are bubbles in injection molded products?(4)

3. The raw materials do not meet the requirements for useIf the moisture or volatile content in the molding raw material exceeds the standard, the material particles are too small or uneven in size, resulting in too much air mixed in the feeding process, the shrinkage of the raw material is too large, and the melt index of the melt is too large or too small. Too much recycled material content will affect the production of bubbles and vacuum bubbles in plastic parts. In this regard, it should be solved by pre-drying raw materials, sieving out fine materials, replacing resins, and reducing the amount of recycled materials. Air bubbles often occur at the last seam of plastic products or thicker parts of the product. The product is first cooled on the surface in the model. When the outer surface has cooled, the central part is still in a hot state. The center part shrinks when it cools, and the plastic surface has already cooled, so the inside can only shrink by itself to form bubbles. There are many thick parts without bubbles when they are ejected from the mold, but after tens of seconds, bubbles appear in the center part. There are many reasons why there are bubbles in injection molded products. When such a situation occurs, we must eliminate them one by one. In addition, we must find ways to solve them. When using methods to solve the bubbles in injection molded products, you should not be careless. If you don’t know, please ask professional Master operation.
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