What are Sink Marks in Injection Molding?
Injection molding is an excellent manufacturing process for producing aesthetic rapid prototyping and plastic manufacturing parts. However, if the manufacturing process is not strictly controlled, there may be sink marks or other defects in the plastic molded products. So what is a sink mark in injection molding? Keep reading as we the top injection mold supplier in China , provide answers to these questions & the essential things you need to know about Sink Marks. Sink mark in injection molding Sink marks are surface defects in injection molded parts that have varying wall thicknesses. In turn, sink mark injection molding occurs in the thick part of the molded part, and this defect looks like a dimple or groove on its surface. A thicker section of the product means that it contains more parts. In addition, these thicker areas extend the cooling time. In contrast, the outer part of a plastic part that is in contact with mold steel often cools very quickly. As...