The effective angle is the actual squeegee angle during printing, when printing forces act upon the blade. The squeegee blade's edge profile is its level of sharpness. Sharper edges deliver less ink to the substrate and are best for higher-resolution images. Dull or rounded edges increase the amount of ink deposited and are generally used for large coverage areas and coating applications. The blade material is typically rolled for shipping and later cut to the specific length required for a particular application or press.
Squeegees can influence printing results, but only if other variables in the process are controlled.
This means understanding the rheological properties of your inks, as well as using high screen tension, low off-contact distance, and press settings that don't oversaturate the screen with ink. It affects the squeegee's adaptability to the surface and determines the amount of printing force transmitted to the screen and the substrate. Soft squeegees are more adaptable and transmit less force than hard ones. This shape also determines the squeegee's adaptability. In a sense, profile fine tunes this adaptability and limits the amount of force transmitted to the printing surface.