Silk screen printing machine printing pinhole processing method is what?
Pinhole phenomenon for personnel engaged in silk screen printing, is the most headache problem.If it is a billboard and thick paper opaque objects, such as printing, this is not easy to observe hole, is generally not a problem.But on the aluminum plate, glass, acrylic board for precision printing, need to the finishing and the corrosion process, were not allowed to produce pinhole.Pinhole occurred is also varied, there are many is inexplicable reasons, there are still problems of quality management.Pinhole is printing products inspection in one of the most important checks.
1) attached to the version of dust and foreign bodies.Plate making, water development there will be some sol.In addition, there are also in emulsion coating, mixed with dust, attached to the screen can produce pinhole.In these trials, such as check, can be found and can be carried out timely.If dust and foreign body attached on the screen, jam screen openings can also cause a pinhole phenomenon.Before the formal printing, if use strong absorbency of paper, after a few piece of printing, you can remove the dust from the version.
2) cleaning on the surface of the substrates.Aluminium, glass, propylene edition version and should be after the pretreatment before printing, should be printed right away.In multicolor printing, generally adopt the method of painted the wipe with alcohol before printing.Additional, still can use semi-automatic and fully automatic ultrasonic cleaning machine.After pretreatment, can remove grease and dirt, and at the same time, also can remove the dirt on the surface.
The advantages of detergent are often mixed with broken fiber, this kind of detergent soluble in alcohol, when cleaning the surface of the substrates, tend to form surfactants of thin film, pinhole will happen when the printing ink on the membrane.So pay special attention to when using detergent, and alcohol.When transporting substrates with the hand, hand fingerprints will adhere to the printing on the surface, forming pinhole when printing.