The tool for ink-return.
The phenomenon that happens when the printed matters are piled up: the ink of the lower material soils the back of the material that is piled on top of it.
This means the hardness of the rocks. It is also used to show the hardness of the squeegee rubber.
The agent to improve abrasion resistance by adding slipping properties to the ink film. Slip agent is normally polyethylene wax or other kinds of wax. As the ink that contains slip agent is resistant to nail scratch, the superficial adhesion becomes good.
The problem that the ink on the back side (the side to be printed) of the screen protrudes beyond the image and smears the screen. That makes the image bold and may even destroy the image. This tends to happen to UV curable ink which is still wet on the screen.
The phenomenon that the stencil moves off from the substrate immediately after touching the substrate. The proper clearance is necessary for smooth snap-off.
The tool to squeege out the ink through the mesh by moving and putting the pressure on the ink. The rubber plate is sandwitched in between the holders.
The angle at which the squeegee is set on the printing machine.
The maximum length the squeegee can move.
Oxygen in the air reacts to the radical in UV ink , consumes it and spoils its activity. The density of the radical is low on the surface of the ink due to this reaction, which slows polymerization. This causes insufficient curing which may lead to tack-lingering. However, this problem has been improved in current UV ink by better photo-polymerization resin and better photo-initiator.
The phenomenon that the printed matters and rubber squeegee swell by the influence of thinner.