Although these inks carry solvents, they are not usually aggressive because their presence is to make the ink into a printing consistency and not to achieve adhesion. Again, the term ‘catalytic’ refers to a large family of inks optimised for different materials and applications. They are characterised by high levels of gloss and have a high build. Therefore, it follows that the volume of a solvent evaporation inks decreases by that amount when dried and that is why these inks are regarded as low-build or low-feel inks. They resemble paint in their drying characteristics in that they require the presence of oxygen to dry properly and they take days to become completely hard.V. Because of this, they tend to be very expensive, although the amount required to print each promotional pen is minimal and therefore is a minor cost. This results in a strong bond being created between the ink and the pen substrate and normally this cannot be scratched off.
.Solvent Evaporation Inks: These are without doubt the most common inks used on plastic promotional pens. In this case, the bonding mechanism relies on the ink sticking to the pen like glue and there is not chemical bonding between the ink and the substrate, unlike solvent evaporation inks.
Long Oil or Oxidation Inks: These inks are hardly ever used these days but are sometimes used for printing on materials when other systems will not provide adequate adhesion. Therefore, virtually all inks are highly technical in formulation and often only launched after years of development.
U. Generally, catalytic inks have a high-build when printed because they have a high solids content. Other benefits of UV curing inks are, finer detail can be printed, higher gloss levels and better print definition. Inks: These ultraviolet curing inks, are being increasingly used in the screen-printing industry for printing promotional pens and promotional items in general. Typically, plastic promotional pens are made from ABS, styrene or acrylic and solvent evaporation inks are perfectly suited to printing these polymers. They all have one thing in common, however, and that is their curing mechanism relies on the polymer chains cross linking with each other which is initiated by Box Printing Machine Manufacturers the catalyst or hardener that is added to these inks. Normally these inks are used to print promotional pens made of ABS or styrene, but it is also now occasionally used for metal pens and pens made from polypropylene. These inks when printed on promotional pens achieve a high level of adhesion because the active solvents melt the plastic. This catalyst is referred to as photo initiator. These ink systems can be made up of sixty percent solvent which has to evaporate after the ink is printed. Within that family will be inks to print polypropylene, metal, stove enamel, nylon, glass, wood etc.
Catalyst Inks: These inks are used on promotional pens when the material the pen is made from is impervious to solvent attack. The disadvantages are that Carton Production Line Suppliers they can be quite translucent compared to other ink systems, they have a high build, they are quite brittle, ink-adhesion is more temperamental, high degree of brittleness, they produce ozone when cured and a protective gloves must be worn to handle them. This is referred to as good screen stability and it normally means downtime is reduced. Occasionally they will be used on wooden promotional pens and metal promotional pens. The term does not apply to any particular ink but is a large family of ink systems formulated for their intended purpose. Although their chemistry is diverse, the mechanism for drying is the same; through the evaporation of solvents within the ink. To an ink manufacturer, the surface of a pen is regarded as a hostile environment for a printing ink because of the level of handling and contamination it is subjected to. Their main advantage is that they are quite easy to print because they do not dry in the screen. Solvent evaporation ink systems are optimised for printing on paper & board, touch control panels, overhead projection slides, as well as for promotional pens and many other promotional items.
In general, all promotional pens must be thoroughly cleaned before they are printed to ensure that adhesion is not compromised. They are similar to catalytic inks in that they require an additive to be added to act as a catalyst to initiate cross-linking