The first printing yield of a fully automatic screen printing machine for sheet materials is influenced by various factors, and its value may vary depending on equipment quality, operating conditions, sheet characteristics, and ink, generally ranging from 70% to 95%.

1、 The impact of equipment factors on yield rate

The high-quality sheet automatic screen printing machine itself has high mechanical accuracy, which can ensure stable parameters such as the distance between the screen and the sheet, the pressure and speed of the scraper, etc. For example, advanced positioning systems can accurately place the sheet in the printing position with an error controlled within ± 0.1mm, greatly reducing printing defects caused by positional deviations and maintaining a high yield rate, which may reach 90% -95%. On the contrary, if the components of the equipment are worn or the mechanical structure is not precise enough, there may be shaking during the movement of the scraper, which can easily cause problems such as pattern blurring and ghosting, and the yield rate may drop to 70% or even lower.

2、 The role of sheet characteristics

The flatness, surface roughness, and static electricity of the sheet can all affect the printing yield. A sheet with high flatness can better adhere to the screen, which is beneficial for the uniform transfer of ink. For example, PET sheet, if the surface is flat and smooth, the yield rate of a single printing may reach about 90%. But if there are wrinkles or particles on the surface of the sheet, the ink cannot be evenly distributed, which is prone to problems such as missed printing and ink accumulation, and the yield may decrease by 10% -20%. Moreover, some sheets are prone to static electricity, which can adsorb dust and other impurities, resulting in defects in printed patterns and affecting the yield rate.

3、 Ink and printing process parameters

The quality and performance of ink are crucial. Ink with appropriate viscosity and drying speed can be better printed onto the sheet through screen printing. If the ink viscosity is too high, it may not pass through the screen smoothly, resulting in incomplete patterns; If the viscosity is too low, ink may flow and cause the pattern to deform. In terms of printing process parameters, printing speed and pressure need to be precisely controlled. The speed is too fast, and the ink cannot be fully transferred in time; Excessive pressure may damage the wire mesh or cause deformation of the sheet. When these parameters are adjusted to their optimal state, the yield rate of a single printing can reach over 90%; If the parameter settings are not reasonable, the yield rate may drop to 70% -80%.

In the actual production process, by fine maintenance of equipment, strict screening of sheets, selection of suitable inks, and optimization of printing process parameters, the one-time printing yield of fully automatic screen printing machines can be effectively improved.