Connection period to easily share some screen printing machine work problems and solutions.

Reason four, pinhole phenomenon and Solutions

Pinhole phenomenon in the screen printing for staff, is the most headache problem.If it is an opaque billboards and thick paper, printing, this is not easy to observesmall, generally not a problem. But the precise printing in aluminum, glass, acrylicplate, after processing and corrosion processing, does not allow the pinhole. In addition, the pinhole is a variety of reasons, there are many is currently not explain reasons, there is still the problem of quality management. Pinhole is one of the most important printing products inspection inspection items.

Attached to the version of the dust and foreign bodies. Seihan, water development will have some sol into the mix. In addition, the emulsion coating, there are dustmixed in, attached to the screen can cause pinhole. These in the test, such as check words, can be found and can take timely. If the dust and foreign matterattached to the screen, blocking the screen openings can also cause the pinhole phenomenon. In formal before printing, with strong absorbing ink paper, after a number of printed, can eliminate the dust from version.

Cleaning the substrate surface. Aluminum plate, glass version, propylene versionshould pass before treatment should be immediately before printing, printing. In the printing of color, commonly used before printing with alcohol inunction method. In addition, also can use semi-automatic and fully automatic ultrasonic cleaningmachine. After the first treatment, can remove grease and dirt, and at the same time, also can remove the dust attached on the surface.

Washing machine detergent often mixed with chopped fibers, the detergent soluble in alcohol, in cleaning the substrate surface, often can form thin surfactants film, in the film printing ink, pinhole will happen. Therefore, in the use of cleaning agents and alcohol should pay special attention to. Handling the substrate with the hands,the hand of fingerprint will be attached to the printing surface of printing, pinhole formation.

Five, network mark prevent measures what?

Ink membrane surface screen printing screen. Sometimes, poor mobility of the main reasons for the emergence of traces of ink screen. Screen printing process, when the plate after raising, transferred to the printing ink to rely on their own flow fillnetwork trace, so that the ink film surface smooth. If the ink liquidity is poor, when picking up your screen, the ink flow is relatively small, can not be filled screentraces, won't get the ink film surface smooth. In order to prevent screen tracesprinted matter, use the following method.

1 in the plate making use of silk thin monofilament screen.

2 may consider the use of printing ink drying speed, increase the flow of ink for theink gradually unfolded and curing.

3 the use of mobility inks.

Reason six, ink film edge defects and Solutions

In the process of screen printing machine printing products, often the problem is that the printing ink film edge serrated margin (including incomplete or broken).There are many reasons for the burr, but the main reason is that the screen itselfquality problems.

The 1 photoresist resolution is not high, resulting in fine lines broken or missing

The 2 time of exposure or exposure time is too long, development is not sufficient,screen printing graphics and text on the edge of irregular, jagged. Good screen printing, graphic edge should be smooth and neat

The 3 screen printing surface is not flat, printing, screen printing and printinghouse still between the gap, because the ink printing ink penetration caused bysuspended, edge burr

4 printing process, due to the occurrence of expanded version of the film exposed to solvents, and the latitude and longitude to different degree of expansion, theversion of the film surface uneven phenomenon, when printing contact screen and substrate surface out of our local: gap, ink ink film will be suspended permeability,burr.

In order to prevent the emergence of serrated cutting, can consider the solutionfollows

1 high mesh screen plate

Photosensitive material plate with high resolution of 2

3 making a film thickness of screen plate, in order to reduce the swelling deformation

4 as far as possible the use of skew the tension and the network method of the tension and the network, the best angle of 22.5 degrees

5 fine line printing plate version of the legal system, as far as possible, because it may be less indirect legal version burr

6 in plate making and printing process, to control the temperature expansionfactors, the use of photosensitive material coefficient of expansion

7 to improve the plate quality, ensure the smooth surface of screen printing, screenline edge should be neat

8 Application of the spray gun spray washing screen plate, in order to improve thedevelopment effect.

Today and share this three common problems and solutions, please later in theprocess of using screen printing machinery in the attention to these three problemsand timely solve.