Jan 8, 2013

Tips for decontaminatation during silkscreen on acrylic products

Acrylic processing some acrylic products need to be the acrylic silk screen, but when the graphic printed parts on dirt or screen printing ink drying solid, such as screen printing acrylic signs, you deal with wire mesh decontamination treatment to stop printing machine after the screen frame lift, when some operators will use the force of emery cloth dipped in solvent under fierce rub template side, you can hear sound big pressroom, often stencil damaged.
A truly knowledgeable operator rarely go rubbing template graphic printing surface, because he knew that the clarity of the printed graphics all graphic edge clear emulsion layer graphic interface. The force of friction will damage the emulsion layer graphic interface, even to wipe emulsion layer, leaving only the bare mesh.
Acrylic processing printing the high screen color image, the thread below emulsifier film only 5-6μm thick wire diameter of the mesh itself perhaps only 30μm, unable to withstand the force of friction. Therefore, the key to avoid boorish decontamination is the first, to prevent contamination of the template is.
The template pollution caused most important reason is the ink properly controlled, resulting in dry ink to stay in the mesh. When using solvent-based inks or water-based inks, the reason is the transfer ink is too thin or too thick. Should be in accordance with the provisions of the amount of transfer ink mixed with additives. Addition, but also in print production, often a small amount of addition of the pre-tuned ink to keep ink change Hua. UV curable inks, efforts should be made to avoid the wire mesh by UV light exposure, but also to avoid the sun shines.
Another ink control problems with printing speed regulation is improper. Automatic or manual presses speed regulation improperly can cause uneven for the amount, so that the mesh by ink dry quickly. The final reason is cause the ink to dry squeegee tone set improperly or have been worn to the high screen printed subtle level image requires scraping edge is very sharp squeegee horizontal angle of approximately 75 degrees . Squeegee deformation or wear occurs in normal use, the sharpness of the image of the vicinity will be decreased, which indicates that the ink may not normally through the mesh, if this problem is not solved, the ink dry solid in net hole. To avoid such problems, you should regularly flip the squeegee to extend its scraping ink side of the life of, or change in the quality text and graphics yet to fall before the new squeegee.
In order to the mesh function properly, but also should pay attention to clean up the dirt ink or plexiglass. Electrostatic adsorption of air pollutants, and poor storage conditions and other reasons, the acrylic surface stained with dirt, the above problem can be solved by improving the storage conditions and process control, In addition to use in addition to electrostatic and acrylic processing decontamination device also prevents dust and dirt from the surface of acrylic transferred to net hole.
If the template is contaminated should be how to deal with it?, Platform screen printing machine, after India finished a set of sheets printer to stop, and then enter a blotter, contact screen with blotter., So the screen at the printing position, then moistened with screen cleaner, non-abrasive soft cloth to wipe off the dirt on the stencil wiper, do not use too much force, so that the dirt will be through the mesh falls below the absorbent paper, an absorbent paper can be reused, if necessary repeat the cleaning mesh. Some fall on the top of the dirt particles may be large, the mesh can not be crossed, but with a soft cloth which can be sticky from. After the cleaning, hair dryer available (transferred to the "cold") drying template.Cleaning cylinder screen printing machine, will encounter different situations. Due to the design structure, not like the cleaning of common screen printing machine as dirt washing fall on absorbent paper. Fortunately, because of faster printing speed, ink drying mesh unlikely. If this happens, the first in India a group of live pieces presses to stop, and then with a soft non-abrasive cloth screen cleaner or thinner dip coated in the top of the printed graphic parts of the template, note Do not leave too much detergent the top of the template. In this case the purpose is to scrub the solvent used within the cell dirt.Fourth, sometimes you have to clear the dirt of the template below. In this case, you should wipe with a soft cloth and gently dirt, do not force while fierce.

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