Color deviation: The reasons may include poor original quality, inaccurate plate making, inconsistent plate setting conditions, good ink color control steps, non-standard sample table light source, etc. The color may be dim and not bright. Jinan Printing Factory believes that there may be poor original quality, poor plate making curve design, low color separation film density, inaccurate plate setting, too light imprints, insufficient printing pressure, aging printing machine, excessive fountain solution, rough paper, and low whiteness.
Text moisture: The reasons may include low positive image density, high film haze, inaccurate printing, insufficient printing pressure, aging of the printing machine, excessive fountain solution, insufficient ink volume, etc.
Paste plate: Due to ink overflow in the image and text of the printing plate, the imprint on the substrate is not clear, which is a malfunction of offset printing.
Dirty plate: Due to poor wetting of the printing plate, ink is applied to the blank area.
Plate drop: The subtle tone of the graphic and text on the flat printing plate becomes lighter, the dot and line area decreases, and even loses ink affinity.
Dot increase: the dot area of the substrate is larger than that of the corresponding part of the printing plate.
Stacking ink: Ink or other substances deposit on ink rollers or blanket, forming embossed deposits that affect ink and imprint transfer.
Deinking: The phenomenon of metal ink rollers being eroded by wetting solution and oxidizing, resulting in the rejection of ink.
Ink emulsification: The phenomenon of ink absorbing wetting liquid during the printing process or printing malfunction caused by excessive absorption of wetting liquid in the ink.
Brushing: During the printing process, paper fibers, fillers, or coatings may detach or be pulled off the surface of the paper due to excessive ink adhesion or differences in surface strength.
Printing malfunction: A general term for the phenomenon that affects the normal production process or causes quality defects in printed materials during the printing process.
Misregistration: The error in overlapping printing marks during the color printing process. Double shadow: A double outline that appears on the same color dot, line, or text in printed matter.
Back dirty: Printing ink printed on the substrate adheres to the back of another sheet, causing scratches and dirt.
Through printing: The images and text printed on the paper are visible on the back.
That's all for the common quality problems and cause analysis of printing products. We hope to provide you with good help. For more information, please come to our website http://www.096685.com Consult!濟南印刷廠講解的內容 更多的內容 請咨詢公司官網http://www.096685.com/