7 Ways to Improve Injection Molding Sink Marks

one of PTMS’ many plastic injection molded parts

Typically, injection molding sink marks are found in a denser area of a component and can arise from material selection, part geometry, tooling design, and processing methods.

Depending on the product and its end use, there are various standards concerning whether sink marks can be present on plastic injection molded components. For instance, toys usually have visible sink marks on their surfaces, while parts for consumer electronics must be nearly free of sink marks.

Here, we discuss how you can improve injection molding sink marks!

How to improve injection molding sink marks?

1.   Design your plastic part through 3D modeling. Our recommendation is to use thickness analysis for evaluating your part. With good software, packing size and feature modification become possible, which can help you reduce sink marks.

2.  You can also use labels to cover a sink mark. Similarly, using a texture can also help. Yes, it’ll camouflage, but it wouldn’t completely cover a sink mark. However, changing the topology of your model part can make hiding possible.

3.  If the sink is located in a hidden place and doesn’t impact the strength or structural integrity, there’s no point in resolving it. Just leave it as is, and it’ll cover the remaining parts.

a black shell

4.  You may see sink marks on the areas of ribs and bosses. However, following industry guidelines can help you avoid them. If the designer is smart, they’ll use the seven-degree rule and thin the thickness of walls around the boss. They’ll also proportion the thickness of the rib base to the wall thickness.

5.  Add some blowing agent to avoid sink marks. It will depend on the end-use of the product and its design. It can lessen the mechanical durability of the components.

6.  One cause of sink marks is unequal cooling. To overcome this, alter the cooling temperature from the core to the cavity.

7.  Sometimes, sink marks can be produced when pressure changes within the molten plastic parts. In certain cases, increasing packing pressure and hold time reduces the sink marks. To maintain this, try slowing down the injection speed.

PTMS offer good quality plastic injection molding parts and make value for customers

PTMS is an ISO 9001-2008 standard certified plastic injection molding company, guaranteeing that the final products should be of top quality.

Get in touch with them now to get an instant injection molding quote!

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