Why does Illustrator add white lines to my pattern when exporting?

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I have an object in Illustrator with a chevron pattern that I created in Illustrator. When I export as a .png file or rasterize image file, it shows horizontal lines.

Anyone have a clue why it does this? I am at a complete loss. It’s not the seams of the pattern.

Below is a .png file export of the image:

white lines

Answer

Be certain to export with Art Optimized anti-aliasing selected.

Note the hairlines coincide with the dashes on the right. It’s a flattening issue which Art Optimized will most likely solve.

If possible, placing a solid, pink-filled shape behind the chevrons would also probably solve the issue by providing the color which Illustrator should use to anti-alias.

This is one of those things with patterns in AI that irks me… poor anti-aliasing.

Attribution
Source : Link , Question Author : user1405177 , Answer Author : Scott

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