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How to avoid sink marks in injection molding？
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One of the potential drawbacks of injection molding process is a defect known as a sink mark, in which the surface of the finished product appears sunken or concave due to uneven cooling or shrinkage of the material.
In this article, we will discuss some strategies for avoiding sink marks in injection molding.

1. What is sink mark in injection molding
Sink marks are a common defect in injection molding, in which the surface of the finished product sinks or caves in, creating an indentation or depression.

2. What Causes sink mark in injection molding
Sink marks can be caused by a number of factors, including：
a. improper mold design
b. inadequate cooling of the molten material
c. inadequate material flow.
d. the presence of air bubbles in the molten material

3. How to avoid sink mark of improper mold design
One of the key factors that can contribute to sink marks is the design of the mold.
The design of the mold plays a critical role in the overall quality of the finished product, and a poorly designed mold can result in defects such as sink marks.
In order to avoid sink marks, the mold should be designed with adequate wall thickness and gate sizes, as well as proper venting to allow air to escape from the mold.
Additionally, the design of the mold should take into account the shrinkage of the material as it cools, in order to ensure that the finished product has the correct dimensions.

4. How to avoid sink mark of inadequate cooling of the molten material
Another factor that can contribute to sink marks is the cooling of the molten material.
Injection molding typically involves rapidly cooling the molten material in order to solidify it into the desired shape.
If the material is not adequately cooled, it may not solidify properly, leading to sink marks.
In order to avoid this problem, it is important to use adequate cooling channels and other cooling equipment in the mold.
And to carefully control the temperature and flow rate of the cooling water or other cooling medium.

5. How to avoid sink mark of inadequate material flow
In addition to mold design and cooling, the flow of the molten material can also play a role in the formation of sink marks.
If the material does not flow properly through the mold, it may not fill the mold completely, leading to sink marks.
In order to avoid this problem, it is important to carefully control the flow of the molten material, using flow meters and other flow control equipment to maintain a consistent and appropriate flow rate.
Additionally, the design of the mold should take into account the flow characteristics of the material, in order to ensure that it fills the mold evenly and completely.

6. How to avoid sink mark of the presence of air bubbles in the molten material
Another potential cause of sink marks is the presence of air bubbles in the molten material.
Air bubbles can become trapped in the material as it is injected into the mold, and if these air bubbles are not properly vented, they can cause sink marks.
In order to avoid this problem, it is important to use degassing equipment to remove air bubbles from the molten material before it is injected into the mold.
Additionally, proper mold design and venting can also help to prevent air bubbles from becoming trapped in the material.
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00:27 What is sink mark in injection molding
00:41 What Causes sink mark in injection molding
01:05 How to avoid sink mark of improper mold design
01:50 How to avoid sink mark of inadequate cooling of the molten material
02:30 How to avoid sink mark of inadequate material flow
03:18 How to avoid sink mark of the presence of air bubbles in the molten material
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