Sample proof is the sole criterion for checking the quality of the entire plate. The quality of the proofing directly affects the quality of the plate and the quality of the prepress. Samples have hollow points that often make people feel that the sample ink is not saturated enough, the color is not bright enough, and the severity will also affect the tone level of the image.
Hollow point is a common quality problem in proofing. There are many factors that produce hollow points, such as the control of indoor temperature and humidity, the adjustment of pressure during proofing, the aging of rubber rollers and blankets, the degree of emulsification of ink, and the temperature of cooling platen. Control, quality of PS version, etc.
1, indoor temperature and humidity control: due to the needs of the machine, printing materials, proofing room should be maintained at a temperature of about 23 °C, relative humidity of about 50%, so that the machine, ink, paper in the best stable state.
2, pressure adjustment: 1 proofing personnel on the machine pressure adjustment: including the drum, ink roller pressure, plate counter, paper table pressure. The adjustment of the above-mentioned partial pressures can be performed according to the proofer specifications or actual proofing requirements. 2 As the customer uses what kind of paper to print, what kind of paper is used for proofing, so that the proofing often makes repeated adjustments to the platen because of different papers. Therefore, before proofing, check whether the pressure between the platen pressure and the paper is matched. Use of the 3PS version: Since the thickness of the reusable PS plate is inconsistent, the regenerated plate is not used as much as possible, and the plate thickness should be adjusted.
3. Aging of rubber rollers and rubber blankets: The rubber rollers and rubber blankets are relatively expensive consumables in proofing. Using them for a long time causes their surfaces to age and form a smooth dura or cracks. They are generally reluctant to replace them, resulting in the failure of outlets. real. Mild aging of the rubber roller or rubber blanket can be repaired by corrosive powder, blanket reductant, and car wash water on the rubber roller and rubber blanket.
4, the emulsification of ink: the cause of ink emulsification: 1 indoor temperature and humidity control is not good, the general temperature should be controlled at about 23 °C, relative humidity of about 50%. 2 The ink should be replaced with new ink on the ink roller for a long time. Table 3 temperature can not be too low.
5, plate temperature control: General situation plate temperature control in the lower than the relative temperature of 5 °C is better, this temperature just makes the plate form a uniform small water droplets, so that the wet plate to achieve the ink balance. If the plate surface temperature is too high, the effect of wetting the plate will not be achieved, the transfer performance of the ink with too low temperature will decrease, and the printing plate will not be easily inked.
6, blanket, PS version of the quality: proofing generally use air-cushion type blanket, because it's elasticity and dot reduction is better than ordinary blanket. Different brands of air-cushioned blankets, their quality is uneven, good quality and poor quality of service life is several times worse, it is recommended to play good proofs or buy some good blankets. In order to save money for some poor quality PS plates or regenerated plates, especially for regenerated plates, the quality of the plates is not stable, and the thickness of the plate is not the same. The quality of the proofing has a great influence on the quality of the proofing. In order to ensure product quality is absolutely not available. This version.
Proofing personnel should pay attention to the problem of hollow spots because the hollow spots cannot be seen with the naked eye. It can only be seen with high magnification magnifiers. In short, there are many reasons for the appearance of hollow spots. The proofing personnel should constantly check the quality of the outlets and promptly find solutions.
The hollow point of proofing and its solution
January 01 19:07:33, 2024
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