The type of pad printing ink for pad printing ink there are several kinds of preparation, including single-component ink, ink, drying type of two-component, oxidation and sublimation ink, etc.
1.One-component single-component ink printing ink dry (also called ink solvent evaporation type) by solvent evaporation, the ink doesn't have to join a catalyst (no) have some ink catalyst, some.One-component ink glossy type and non glossy type two kinds, they are mainly used for plastic printing.
2.Two-component ink two-component ink is also called chemical reactive ink, be sure to add catalyst before printing.In the catalyst and ink resin reaction, through polymerization reaction to achieve the purpose of the ink dry.However, in known as "adaptation" ink chemical reaction without solvent volatilization in the process.
When using two-component ink pad printing, it is necessary to add a certain ratio of catalyst, usually use quality (weight) to measure.Catalyst addition ratio must be controlled strictly, and too much, will greatly shorten the ink "adaptation";With too little, may cause ink dry to reach the best performance when dry.In general, if the ink and the catalyst mixing proportion, can lead to uneven ink adhesion and printing quality defects such as the durability of the printed image is not enough.Ink after the "adaptation", though adding a certain amount of solvent may do some remedial, but should be acceptable the printing effect is unlikely, it is better to replace the ink.
3.Drying type ink drying type ink is divided into two kinds: one is based on standard two-component ink to add additional catalyst;Another is specially prepared for glass, ceramic and metal substrates such as ink.As its name suggests, dry ink must be heating and drying under a certain temperature.When using this kind of ink to compute the drying time, the higher the temperature, the shorter the drying time, but the drying temperature is too high ink film causes brittleness, so want to be in to keep ink flexible temperature drying inks.
4.Oxidation type ink oxidation type ink absorption of oxygen in the surrounding environment of polymerization to form the ink film, do not need to add the catalyst.Typical application of oxidation type ink is flexible packaging printing and synthetic material, such as rubber or keyboard.Due to the oxidation type ink drying speed is slow and need a long time, so usage is limited.
5.Sublimation ink sublimation ink in use process need special processing, is after printing to heating, make present a porous substrates, such as dye in contact with the heating of the surface of the substrates, inks dye into the gas phase, and then into the surface of substrates, actually changed the surface of substrates.Once cooled substrates ink, adhesive on the surface of substrates.
Sublimation ink computer keyboard is the most common application of printing, the higher requirement for oil resistance, abrasion resistance and the print, and this is by using two-component ink.Particularly noteworthy is that due to the sublimation ink is actually changed the surface of substrates and substrates and ink color matching between is difficult, so the color of the substrates must need the color of the light than the last printed, reason is sublimation ink color deeper color change on the surface of substrates is often less obvious.
6.Special inks and ink additives other usage is limited, such as edible ink, silicone resin, printing ink, lubricating oil, corrosion resistant inks, conductive inks and ink UV light curing inks, can also be used for pad printing.The ink's ability to quickly become sticky will decide whether to transfer ink to the surface of the substrates effectively.At the same time, in order to adjust the ink printing eligibility and performance, in addition to adding solvent and catalyst, they may also use a lot of additives, such as viscosity regulator, charged with electrostatic agent, rheological agent, etc.However, fertilizer use will have a big impact on the ink printing performance, must be careful when using