Screen printing machines, silk screen printing of the final result of the techniques used by integrated, so every tools, techniques, the formula and operator has a more or less influence on it, even the most humble ink scraper also played an important role in screen printing.Whether the manual printing or mechanical printing, scraping blade is one of the most popular tools used in the printing ink transfer.
Forced through the silk screen version in addition to using ink scraping blade, there are some other methods, such as vacuum pressure or roller pressure, but the scraping blade is the most commonly used tools.Scraping blade consists of several parts: one who has a groove boards as the handle;A rubber blade inserted in the grooves of the board, prominent groove;A fixed device.The most commonly used scraping blade made by two pieces of wood.Scraping knife handle and blade coupling method also each are not identical.
Most printing machine scraping knife handle are made of wood, and aluminum.Groove handle can be made from hardwood can also be made from cork, but must be dry, without mark.Cork (e.g., white pine) is used because it not only has enough strength, and lighter, can make large size handles.This is because the scraping blade length can reach about 72 inches (183 cm), so its weight is very important.Lighter scraping blade is easy to use.
Scraping knife handle to contact with the operator palm, so handle to round edges and corners, in case the mill hands.Rubber must be with the handle of the blade groove is better, if not better, different color ink can stem node, the gap between the blade and handle groove affect the color of the printing ink.Some operators in the position of the blade and handle groove contact coated with lacquer, used to prevent ink stem node, and makes it easy to clean.In the use of three and four colors printing large-scale screen printing workshop, all sorts of color, respectively, using different scraping blade, and cleaning, when used for printing the same color.The wooden part of the scraping blade should use sandpaper, in order to make sure no coarse sand.
Rubber also can make the blade, polyurethane or other types, but must have good wet resistance, corrosion resistance and heat resistance.It must be for animal, mineral, vegetable oil and grease resistance.Also can withstand inks is contained in the oxidation of metal components.Rubber or benzene, alcohol, paint, enamel, screen cleaning solution and the influence of the film solution.Synthetic rubber has good fire resistance than natural rubber has good printing can be.Natural rubber life is short, easy to deformation, easy to be a solution.Rubber raw material sources and all same pigments and composite.With a variety of different hardness rubber edge, generally used for silk screen printing 45 ~ 80 the hardness of the blade.Generally speaking, the supplier has a soft, medium, hard three kinds of the blade.45 ~ 50 hardness is soft blade, the blade of the 75 ~ 80 is very hard.
Blade front determines the ink deposition thickness and uniformity, feng must be parallel to the printing surface of the blade.Into the groove of the blade to better fit in or between two pieces of wood, and wood wool nail fixation.Fixed nail to four inches a wood wool, nail to cross, across the board on the side of the first, and then into the other side.The thickness of the blade about 1/4 to 1/2 inch (0.63 ~ 1.27 cm);Height of about 1.5 to 3 inches (3.8 ~ 7.6 cm).Blade thickness, height and length of scraping knife grip size and scraping blade length.Although some printer can use tools handmade scraping blade, but not so real, after all.The best scraping blade is suitable for various purposes in screen printing are available to the suppliers, and cheap, the price of it with the scraping blade line length varies.Intact scraping blade can buy all kinds of length, blade and handle can buy separately.
Screen printing machine by scraping blade length to complete the work piece and the net frame size.Suggest the scraping blade smaller than the screen size 2 ~ 3 inches (5-7.6 cm), but to be on a trip to cover the whole the design to be printed.
In order to keep the two make scraping blade and ink printing clearance is in not contact state, to the staff to break time, need to insert in the middle of the scraping blade a support bar.Have used to insert a scraping blade surface vertically support bar method.Scraping blade usually use hands to control.When using only one hand scraping blade control, one hand can empty out the rest.