Black spots refer to dark or striped black spots on the surface of the product, usually appearing near the gate along the flow direction. This defect is a surface quality problem and is common in the injection molding process. The following is an analysis and elimination method for black spot defects. Analysis and elimination method […]
Tag Archives: Overmolding for injection molded parts
Welding line of overmolding of injection molded parts. The molten plastic in the mold cavity converges in multiple strands due to the holes of the insert, the area of discontinuous flow rate, and the area of interrupted filling material flow. This low-temperature molten material converges in the form of linear welds because it cannot be […]
Overmolding and Insert Molding refers to the molding process of inserting a pre-prepared insert of a different material into the mold and then injecting resin, so that the molten material and the insert are bonded and solidified to form an integrated product. Out-sert molding refers to the process of inserting the injection molded part on […]
For injection molded parts, shrinkage and whitening are generally a pair of conflicting problems. Usually, part shrinkage is caused by low cavity pressure and insufficient injection of parts. And top whitening is usually caused by high cavity pressure and over-injection. Logically, this pair of happy enemies should be mortal enemies and never get along with […]
Due to the popularity among consumers, the application of dual materials has become a major trend in recent years, with a wide range of applications, from toothbrush handles, comb handles, cleaning brush handles, knife handles, scissors handles and other daily necessities to flashlight handles, hair dryer handles, electric iron handles, electric toothbrushes and other small […]
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