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The appearance of bubbles, voids, sinks or blisters on an injection-molded part make up the most significant causes for part rejects due to cosmetic requirements. These troublesome “features”, although not the most common of problems when injection-molding parts, can inhibit part performance and are problematic to solve.Bubbles are either pockets of trapped gas or vacuum voids. It is important to determine which type of bubble exists in your part to more quickly pinpoint the source and determine the correct adjustment to make. A simple test of warming the part area containing the bubble until it softens can be used to determine its bubble type as trapped air or void. With the test, if there is gas trapped in the bubble, the gas will warm up and want to expand the bubble as the part softens. If there is no air in the bubble and a vacuum void exists, the bubble will collapse due to the atmospheric pressure pushing on the softened walls of the part. A hot air gun is best to heat the area, a small lighter is next, and a torch if you know what you are doing.
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