The causes of scraper line mark
(1) no ink line mark. Mainly is the printing ink mixed in with the hard inorganic impurities, such as sand and so on, these hard particles embedded in scraper blade place and cause line mark. Sometimes this kind of scraper line mark, also show the dotted line, line of mark of scraper appear very easy to damage the printing and scraper.
(2) with thicker ink continuous line of a spatula mark. This is mainly because some are coarse particles or the soft of impurities jacked up the sword scraping ink, or the damage and produce scraper. This is the simplest and the most common scraper line mark.
(3) the "meteor" shape scraper line mark. This kind of scraper line mark in print roller outlets generally very shallow or not sculpture outlets appear, appear and disappear, and part of the product quality great harm. This kind of scraper line of mark of reason is more complex, DuoNian to continuously someone from printing ink, plate-making, printing environment have been explain, but so far, no one is more perfect. Good for "active particle hypothesis".
(4) the filaments of continuity scraper line mark. This kind of scraper line mark, like hair, small as in printing process often appear, and it's hard to watch in printing machines, until that has got a lot of products issued by, so the quality of great harm. This kind of scraper line mark can be divided into two kinds, one kind is soft can use bamboo knife light erase, is mainly caused by the impurity; While another is at present, and then slowly filamentous hair ribbon, can't use the distribution of bamboo knife wipe, its cause is very complex, involve printing ink, plate making, environmental temperature, humidity, scraper soft hardness, need the concrete analysis of processing. Overall, about the following several aspects:
A. version roller. The rollers surface finish is bad, the rollers surface plating chromic layer hardness is not enough, version roller smooth without too much lubrication also easy to produce.
B. printing ink. Ink fineness is not enough, pigment particles is too big, printing ink in the process of using mixed in with the granularity of impurities, Ink dilution is not standard, produced a solvent impact phenomenon; Ink antistatic performance is poor, printing ink the lubrication properties is poor. High hardness of pigment use will produce line.
C. Environmental aspects. Printing shop in air temperature, humidity and clean can also affect.
D. scraper. Hard than soft squeegee scraper produce line mark. In addition, if produced scraper line after mark cannot be handled in time, will be online of mark of the swing back and forth with the spatula around produced a bunch of scraper line of mark.
(1) the outfit knife must level off, the careful, put the sword to check whether piece before scraper gaps, pack knife after grinding, must be carefully in the printing process like a sword silk appear, must stop again careful grinding. It is strictly prohibited to whet knife of oil in the mixed ink.
(2), reduce dust control environment must be, to remove the faults. Should as far as possible to keep the closing of the environment, color printing installed air filters and dust content, otherwise, it is difficult to have a verification of high quality products.
(3) caused by version roller knife silky occur in shallow parts, such as network, rough, gradual change excessive version uneven, nets deep don't fit, etc. Should be generally by metallographic sand paper mill version, pay attention to deal with grinding edition hard to even, especially serious to return plate making treatment plant.
(4) reduce the ink viscosity, such as the viscosity is too big, layout ink dry too fast, relative increase the rollers version with the friction between the scraper, scraper difficult to scrape board formed under the knife silk printing ink.
5. If the sword is caused by the ink silk is usually due to a printing ink with junk or ink uneven dissolved by, shall take filter printing ink, chose to dissolve the strong solvents or changing ink.
First of all: request every time added to ink dish amount of ink less, to keep often add new ink.
Next: requirements of the viscosity of the ink keep consistent throughout, had better be to use viscosity controller to control.
Finally: mixed colored points, light the organic and inorganic pigment ink density differences to cause failure.(Gold Printing Group)