On the ink scraping knife angle of those things 

Scraping ink knife must be determined in advance angle, to the ink to provide direction transfer to the substrate, and the amount of pressure that produced a the amount of ink easy to transfer the "through the meshes of the extrusion pressure". If the squeegee is set at 0 degrees (vertical position and printing machine), can't squeeze any ink through the mesh. 

Once the adjustment of an angle such as 20 degrees, the ink will be accurately in this direction. The angle then increases, the buckling of scraping knife contact point will lead to increase the amount of ink. 

Instead, squeegee angle over the general assembly to make the printing plate too much ink in the pre, and then transfer the ink more, but will loss fine lines and text edge definition and subtle level must be in clarity and ink layer thickness of the two extremes to find a balance. Therefore, scraping ink knife manufacturers provide printing compound frictioning bar, is a hard support and soft combined with the surface of the new scraping knife, meet the printing of good opacity and fine level requirements. 

The different hardness of scraping knife (from soft to hard 60 degrees 85 degrees) printing ink thickness and image clarity, but also affected by the scraping angle. In other words, from soft to hard printing results of the scraping knife is close to and from high to low lprinting angle printing results. The scraping angle in printing machine increases, usually with a soft scraping knife for the actual printing angle of hard scraping knife is bigger, the result is more attached to the ink. With few exceptions, the general rule is that the ink layer is thin, the clarity of the image and the better the subtle level, and vice versa.