Influencing Factors of Printing Ink Preparation in Tinplate Printing

1. Inaccurate weighing or uneven mixing of printing ink in tinplate printing

The preparation of printing ink means to prepare and weigh the relative amount of each multi-component original ink according to the printing ink, and stir evenly after mixing.

At this stage, electronic scales are usually used for weighing. When the operator weighs the original ink, the color of the printing ink will be inaccurate during packaging and printing due to inaccurate weighing or uneven mixing during tinplate printing and preparation.

Especially when formulating light gray tinplate printing inks, such as light pink, light green, light blue, etc.

Light gray tinplate printing inks are usually formulated based on adding a lot of white ink or diluent to the original ink of the relative color, at least the original ink accounts for a small proportion.

However, the effect of the developer in the spot color ink is very significant. If the weighing of the original ink is slightly inaccurate, the color of the spot color ink will be greatly affected after color matching.

2. The proportion of mass-produced spot color inks in tinplate printing is inaccurate

In tinplate packaging and printing, the standard color draft used to specifically guide packaging and printing is made by proofing.

The spot color ink commonly used in proofing is the standard color draft for packaging and printing determined by the customer's signature after the production of the batch production tinplate printing ink sample draft prepared by the operator.

If the customer's signature is confirmed, then the proportion of spot color ink on the standard color draft will be calculated from the proportion of mass production tinplate printing ink when proofing.

If the proportion of printing inks for mass production is not accurate, there will be large color errors when preparing a large number of printing inks when packaging and printing. This type of error is especially reflected in spot color inks where the proportions of multi-component raw inks vary widely.

3. Tinplate printing paint thinner added too much

Tinplate printing ink has the characteristics of resistance to metal processing, which is mainly characterized by high adhesion and low liquidity, which has a negative impact on the migration of printing ink during packaging and printing.

In order to improve the packaging printability of printing inks, magnesium-added paint thinners are used to reduce stickiness and improve flowability.

However, the amount of paint thinner should not be too much, because after printing on tinplate, it needs to be baked in an oven at 150-180 ° C. During the baking process, the paint thinner and printing ink are dried together. If the paint thinner If too much is added, the tinplate printing ink will be too thin, and the printing dots will become virtual after baking.

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