How to choose the appropriate ink type for shrink

2022-10-04
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How to choose the appropriate type of shrink label printing ink

choosing shrink label printing ink needs to know that there are many kinds of shrink label printing ink. How to choose the appropriate type of ink? Ink suppliers should first understand the following information

printing method

flexographic printing and gravure printing are mainly used in shrink label printing. The printability of different printing inks is different

container shape

different container shapes have different requirements for the shrinkage of materials

printing materials

different printing materials such as PVC, OPS, OPP, PETG and other materials have different requirements for ink

storage and transportation environment of products

during the production, transportation and sales of products, what conditions will the container encounter, how much friction coefficient is required, what is the temperature and humidity environment, and whether there are special requirements (shrinkage labels of beer and beverage products need good ice water resistance), etc

only after understanding the above factors, we can choose the appropriate ink from the aspects of shrinkage, adhesion and the ability to release residual solvents (the ability of rapid drying at low temperature)

shrinkage rate

this is the primary consideration when selecting heat shrinkable label printing ink. Because different products have different requirements for shrinkage. Products with high shrinkage require a shrinkage of 60% - 70%, while those with low shrinkage require only a shrinkage of 10% - 20%

adhesion

during printing and rewinding, ink layers will often contact each other. If ink with poor adhesion is used. Then the contact of the ink layer will cause problems when the products are stacked, and the most common problem is adhesion. Generally, if the ink cannot adhere well, the method of raising the requirements for materials and constantly increasing the temperature of the high drying box can be adopted. However, heat shrinkable materials are sensitive to temperature and cannot rely on increasing temperature to improve ink adhesion. At present, solvent based inks and cationic UV inks have the best adhesion. Water resistant ink and free radical UV ink have relatively poor adhesion due to the limitations of their raw materials

residual solvent

now the national standard has quite strict standards for solvent residue. Through the axis of the oscillating part 102, in order to make the solvent volatilize faster, the printing factory adjusts the drying temperature higher during the ink drying process, but this will lead to the pre shrinkage of the material. Therefore, we should not apply too much heat to shrink labels in printing. This requires finding a balance between printing conditions and drying conditions

in addition, before choosing the appropriate ink for a specific heat shrinkable label, the printer must also strictly test the heat shrinkable film and its compatibility with the ink. General test items include adhesion, water resistance, adhesion, friction coefficient, residual solvent, etc

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