The vast majority of ink manufacturers recommend on their packaging labels that the ink be shaken before loading it into the printer.
Most inks contain pigments (organic or inorganic) in addition to other chemical compounds such as dispersants, defoamers, deflocculants, etc.
Over the weeks, during its storage period, the properties of the dispersant are reduced and this causes the pigment particles to fall towards the bottom of the bottle.
Recovering the state of suspension and dispersion of the pigment is the main reason for stirring the ink before using it in the printer.
If the ink is not shaken before use, four fundamental problems occur:
- Much of the pigment remains in the bottom of the bottle. Pigment is what gives color to ink and is the most expensive element in ink. If it stays in the bottle, we are paying for nothing.
- The fact that the ink has less pigment, makes the printing tone lighter, and therefore we need to use more ink to have the same tone.
- The change in tone produced by the least amount of pigment, will make us have to adjust the designs we are printing, with all the expense that this entails.
- As deflocculant loses its chemical properties, the pigment particles are grouped together, forming larger nodules that can easily clog the nozzles of the heads.