How to Remove White Lines from Patterns in Illustrator when Exporting.
To avoid these white lines/borders in your vector pattern after exporting, do the following:
1
Go to File > Export > Export for Screens.
2
In the Formats section, click on the gear icon.
3
Select “Art Optimized” in the Anti-aliasing settings.
4
Click “Save Settings”.
5
Click “Export Artboard”.