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2020

Why does the same batch of ink produce inconsistent print colors?

There are many reasons why ink color can change. Sometimes, differences in the ink formulation lead to variations in color; other times, improper cleaning procedures can cause residual ink from a previous color to bleed into the next, resulting in uneven coloration. However, printing presses often encounter situations where the same batch of ink exhibits inconsistent color shades—why does this happen? Inconsistent print colors can severely compromise product aesthetics, leading to customer complaints and returns. Generally speaking, when printing with the same batch of ink, there are two common scenarios: first, the color changes during continuous production after the ink is loaded into the press; second, the color shifts after multiple uses of the same ink. This article focuses on the first scenario. 1. Color Changes During Continuous Production After Ink Loading This issue frequently arises in large‑scale orders—for example, when printing for brands like Wahaha, Uni-President instant noodles, Mengniu, or Yili. Even with the same ink, different colors may appear. These orders are typically very substantial, requiring extended production runs that can stretch from morning until afternoon. During such long printing sessions, color consistency tends to fluctuate. Initially, the color appears normal, but after about 1.5 hours, it begins to deepen. Operators then often add water to lighten the shade. Another 1.5 hours later, the color becomes noticeably lighter, creating significant variation within the same batch. 2. Solutions: Collect Production Color Data, Take Samples, and Adjust Ink Regularly While numerous methods exist for controlling ink quality, in practice, adjustments are usually made only after color changes have already occurred, rather than proactively preventing them. To ensure consistent color across an entire order, it’s essential to account for factors related to the printing equipment. In such cases, collecting production color data, taking samples, and establishing a regular schedule for ink adjustments are crucial steps. The specific operational procedure is as follows:

There are many reasons why ink color can change. Sometimes, differences in the ink formulation result in varying shades; other times, improper cleaning procedures can allow residual ink from the previous color to bleed into the next, leading to uneven coloration. Yet, printers often encounter situations where the same batch of ink exhibits inconsistent color intensity—what accounts for this?

Inconsistent printing colors can severely compromise a product’s visual appeal, leading to customer complaints and returns. Generally, when the same batch of ink is used for printing, color variations fall into two categories: first, the color changes during continuous production after the ink has been loaded into the press; second, the color shifts as the same batch of ink is reused multiple times. This article focuses on the first scenario.

1. Continuous production after the ink is loaded into the press can easily cause color variations.

In large‑volume production runs—such as those for Wahaha, Uni-President instant noodles, Mengniu, Yili, and other brands—it’s not uncommon for the same ink to yield noticeably different colors. These orders are typically very substantial, requiring extended printing sessions that can stretch from morning start‑up to afternoon completion. During this time, color consistency is prone to fluctuation. At the outset, the color appears normal; however, after about 1.5 hours of printing, it begins to deepen. Operators often respond by adding water to the ink to lighten it. Yet another 1.5 hours later, the color density drops further, becoming too light. As a result, the final batch ends up with significant color variation.

II. Improvement Measures: Collect production color data from the printing press, take samples, and adjust the ink at scheduled intervals.

There are many methods for controlling ink, yet in the production process, ink color adjustments are typically initiated only after a color change is observed, rather than proactively preventing such changes. To ensure consistent color reproduction across batches of the same order, it is essential to account for factors related to the printing equipment. At this stage, it is necessary to collect color‑production data from the press, take samples, and establish appropriate intervals for making ink adjustments. The specific operational steps are as follows:

Ink, color, printing, production, variation, proceed, printing press, generate, result in

What should be considered when printing brochure advertisements?

Note that these three factors can help maintain the color durability of advertising prints.

What should be considered when printing brochure advertisements?

Note that these three factors can help maintain the color durability of advertising prints.