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. 

injection mold supplier in China


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 a result, this difference in cooling time between the outer part of the part and its inner part causes defects. How? When the molecules in the thick part of the prototype begin to cool, they shrink, as a result of which the outer part is drawn in, and sink marks occur. However, if the outer part is strong enough, this shrinkage will cause voids instead. The degree of visibility of the sink depends on its depth, the color of the product, and its texture. However, it is important to note that due to its ability to reflect light in different directions, small sink marks are well visible.

Causes and countermeasures for sink marks in injection molding

In the production of parts by injection molding, molten material is injected into the mold. In the mold, the material solidifies into the desired part. Then its discharge occurs.

Injection molding sink marks often occur when the thickness of the part injected into the mold is too thick for the resin used. However, there are other causes of sink marks. Now, let's explore their causes & how to reduce sink marks in injection molding.

Looking for the best place to find injection molding service? Think HS MOLDS! They offer the best quality in both prototyping and full-scale production. As the top injection mold supplier in China, they supply quality products to their clients. Contact now!

Resource: What are Sink marks in injection molding?

Location: China

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