The tab keeps the screen edge high even though you press the mesh during a stroke. Without an inactive contact tab, you might have trouble in cleaning the mesh because the screen wants to stay flat with a shirt while ink stuck in it.
If you don't have the right contact, some problems can arise. If you are looking for screen printing then you can navigate this link milehighathleticapparel.com/screen-printing/.
If your deceased ink contacts too low, you will not be able to delete the screen correctly. You should see a mesh screen bouncing off the shirt and can see ink and shirts through a mesh screen that is cleaned.
If your ink stays on the screen mesh and the screen mesh attaches to the shirt when you pull the screen up, your ink will look very rough and the parts can be detached from the shirt. If you experience this problem, you might need to increase your contacts a little. Also, this problem can arise from your actual print stroke which will be discussed later.
At the other end of the spectrum, if you are inactive, contact is too high; You have to press the squeegee very hard so that all the ink gets into the shirt. I have gone to the store to help customers who have almost half an inch of contact.
If your contact is too high, it will be difficult to transfer ink to the shirt, but there is a high chance that your screen will not drop in the same place at any time. This can cause blurry images or double images after flashing. Inappropriate contacts are very important for images that look good and print easily.