Printing techniques and precautions A, printing ink performance
1) concentration: concentration big ink in printing ink dosage is less, inky better; Concentration small ink in printing ink dosage is more, inky light;
2) fineness: namely ink size, printing ink fineness, ink, high concentration of printed outlets clear, full are powerful; Ink fineness low, prints dot easy be afraid, low rate of resistance of printing plate;
3) viscosity, viscosity is big, easy cause preach ink not divide evenly, outlets and the phenomenon such as flower version imprinted; Viscosity is small, easy cause ink emulsification and layout float dirty phenomenon;
4) fluidity: flow degrees, can make the graphic level unknown, inky not full; The fluidity small, make ink spread not smooth, not even, easy cause in the same printing face pale or after a former deep before after the phenomenon; deep pale
5) resistance to light sex: light resistance, good sex printed ink color products is flowery, graphic dot full, strong, rich stereo feeling, and can long-term preservation; The weak light resistance, ink, printed out the product color easy becomes shallow, darker;
6) water resistance, acid, alkali resistance to offset printing inks, want, special attention to its resistance to water, acid and alkali resistance, water resistance, alkali resistance strong ink, printing out products bright color, distinct, outlets clear. Water resistant, acid and alkali, poor printing ink, printing out product gloomy weakness, level, outlets don't clean. Unknown
Second, education version water
Education version of the PH value of the water plant general in 3.8 460 between, in practical production according to the specific circumstances of printing conditions to attune card, if embellish version of acidic water had strong, the blank page when sand holes and graphic based corrosive returned to increase oil, easy cause flower version of the phenomenon, make plate printing resistance force down; Meanwhile, ink roll emulsified ink easily produce deinking, prints gloomy without light.
pinchang123If education version water acidic too weakly, can make the hydrophilic denounce plate blank layout easily abate, oil resistance within dirty and caused by print dot enlargement phenomena (UV ink paste edition printing, if embellish edition, acidic water acidic layout easy up dirty)
Three, color sequence
Color sequence are those of multi-color printing, the printing plate has different color order will produce all sorts of different sequences, reasonable arrangement color printing effect sequence is very important. But color sequence is not absolutely, the color sequence arrangement is generally
Monochromatic machine: yellow, magenta - green - black double-color machine: black, yellow, magenta - green (landscape) or blue print and red (printed characters);
Gold, silver, full edition printing, general to field first gold, silver, full version field, wait for dry after the ink color set of four. Four, batch printing
1) check four-color film specification is consistent (four zhang film sets); whether
2) control tear sheets, check graphic is complete;
3) stable quantity of moisture, ink, achieve, to ensure Heng ink flat with batch prints inky consistently;
4) try to accomplish little downtime or after stopping cleaning rubber cloth (already can put some over edition paper)
Four, formal printing
Formal printing, the operator should concentrate on when to do:
(1) see: see, see the sample machine operation process, alignment and network quality;
qingtian123(2) listening: listen to the machine without exception, listen to the sound vibrations sensitive area without murmurs machine;
(3) touch: touch machine is easy for wear and increasing parts, are there significant temperature change;
(4) smell: smell have electric scorched and other abnormal smell. (UV ink printing should pay more attention to the power line UV machine);
(5) check: check print situation and machine or abnormal situation, found that the problem, promptly eliminate.
Five, how to identify the size of the water
Identify the water, first of all, should not see page moisture. This, by the operator experience. Generally speaking, the moisture content is big, layout, strong light volume lighter side; Conversely, layout, ovoid amount weak light is dark;
If water is too big, still can be observed from the following a few points out:
(1) in ink roll with cardboard, cardboard on ink will tackle with tiny drops;
(2) string have small drops of water roller, ink roll group deinking phenomenon or in water;
(3) shut after water or stop longer layout moisture is still not dry;
drinkwatchs(4) imprinting outlets empty, without luster inky dark;
(5) rubber roller edn thou shalt ShuiYing or water droplets. Where there's
Six, control the water balance
Inks and water and not absolutely incompatible. In the actual printing process, ink and water after plastic roller and roller extruding, will merge together, make the ink emulsification. Ink emulsification state has two kinds: when the water big ink hours, forms a "water bag oil"; When the water little ink, forming a "large water when considered."
In offset printing, ink and balance with the master degree of the normal transfer, molecularly imprinted depth, inky adjustment of the accuracy, printed matter such as glue dry and dirty intimately connected. Generally speaking, the water is big, make ink gradation emulsion, shallow; Water is small, the blank layout, produce will adhesion ink dirty mark. Therefore, offset printing ink and balance control the key is.
Seven, control ink and balance
Control ink balance, generally want to master the principle of water less ink thick. Water is less, refers to the forum blank not glue the dirty for the premise; Ink thick, refers to establish the basis of in water less appropriately increase ink volume. In printing process, it is the most taboo water ink. In considering water, depending on the size and distribution layout graphic area, imprinting ink layer thickness, printing paper properties, printing ink performance, machine speed, workshop temperature and humidity, embellish version of liquid in the printing ink PH value and the auxiliary agents etc added to circumstances.
xinleshiEight, cleaning rubber cloth, when change color ink roll must clean
After a period of time after printing, rubber cloth will amass a paper wool, paper powder, ink skin and other dirt, reduced prints quality, so rubber cloth to clean, especially in low intensity of paper printing paper, paper wool, more serious, the accumulation of powder therefore more must clean frequently.
Change color ink roll group is not if clean, it will affect the new inky dark ink by the purity, especially for light color ink to attention. If by black ink into yellow ink, black ink if didn't wash clean, yellow ink will pan-black, this will affect the quality of the prints. Therefore, when change color ink roll group must clean.
Nine, the main factors of misregister
Around misregister:
(1) the printer
A. and adjusting plate lock screw no fixed, or send paper on the M5 hex screws rocker, whether it has fixed tightly;
xinghuaB. pushing paper seat sheath for wear;
C. paper-feeding tooth wear;
D. printing pressure is too small;
E. gear wear;
F. rubber cloth too loose, not bind.
(2) paper
A. paper cutting precision;
B. the printing, paper excessive water has flexible.
(3) other
A. plate or manuscript itself has a problem;
B. paperboard heap too high or pressure paper block pressure caused paperboard go oblique overweight.
Or so set of a prohibit:
xueweiA. or so tight or baffle about whether baffle screw fixed;
B. paperboard varies in length;
C. roller or so channeling move;
Ten, produce oil dirty reasons
Oil dirty can be divided into two categories: one kind is due on ink blank layout, with greasy happened are fat, commonly known as "greasy state appear"; Another kind is due to very fine after ink emulsification of grains distribution in space, commonly known as "float dirty."
Oil dirty causes are:
(1) plate
A. plate itself quality (version base bad or reproductive);
B. when sun exposure time of deficiency, version too low; the concentration of developer
C. plate layouts protection glue not clean;
D. the blank plate by oxidation;
(2) the printer
A. rely on edition stress light;
B. water roller the pressure between too light;
C. ink viscosity low;
D. rubber cloth surface aging;
E. paper powder and paper wool wear plate;
F. embellish edition liquid PH undeserved.
Eleven, two-tone before and after the causes of ink
In the actual printing, sometimes find that the same screen ink, often before inky two-tone before the majority, deep inky after former light pale after less. Deep phenomenon
The process of deep light differ before and after the reasons:
(1) drum parts
guanliquanA. roller gear or bearing shaft neck use years wear.
B. cylinder shaft neck and roller shell different heart.
C. by version roller and overweight, and produce plate stress beat
(2) ink roll part
A. use ink roller surface aging years
B. ink roll long-term didn't get JiMo, causing the surface cleaning, cannot go to the ink
C. ink viscosity too big
Twelve, ink, what produce poles yes how eliminate?
Ink that poles printing flat network or field printing, printing appear on page and set the axial array of obvious, commonly known as "deep stripe black bar" or "black TiaoTou".
Ink poles causes and eliminate measure is:
(1) the roller gear in long wear away, should use to replace a group of new gear;
(2) printing plate stress or with rubber roller drum between under too much pressure. Should adjust the proper pressure;
(3) gear embedded paper wool, between ink skin of dirt. Should remove all dirt, join between gear gear lubricants, strengthen the new machine cleaning maintenance work;
(4) between plate and excessive pressure by version roller, should be adjusted by version roller and the pressure plate;
(5) by version roller surface uneven or roller core bending, not straight, should be replaced new ink roll;
(6) ink over thin, should add a little 0 # printing ink oil, to enhance the ink sticky;
(7) paper coarse, surface strength is poor. Should frequently wash rubber cloth, and in the printing ink join # 6 printing ink to lower the viscosity of oil, reduce paper ink off powder, wool degree
Thirteen, water poles causes how to solve?
Water means in printing ball when net, or field set flat plate layout and set, appear on the one of the obvious axial stripe, commonly known as "white light poles" or "white head".
Water usually made poles emptying part of the cause, causes and solutions are:
(1) water roller and Lord evenly between the ink too much pressure, should to readjust the pressure between them, make its proper eased the pressure;
(2) ink roll surface emulsion, water JiMo too much;
(3) layout moisture is too big, should reduce water, clean rubber cloth, serious when cleaning ink roll;
(4) education version should lower water acidic too strong, acidic water education version.
Fourteen, flower version of reason, how to eliminate?
Flower version refers to the plate on reducing, empty, feeling dot lipid sex is abate, fine idea lost, colour and lustre is dim
Flower version cause and eliminate measure is:
(1) with rubber roller printing plate cylinder between stress, should reduce roller bag line thickness;
(2) water roller and sheung shui roll the pressure between too small (large), should be proper water adjust water roller and sheung shui roller pressure;
(3) education version should dilute acid is too strong, water, reduce its water education version of acidic;
(4), should reduce water supply excessive water;
(5) ink viscosity is too big, should be in the printing ink added with a certain volume of printing ink, reduce oil viscosity ink;
(6) plate itself in the process of plate and bask version is already flower version phenomenon, should change new.
Fifteen, paste version of the reasons? What are those? How to eliminate?
Pasting edition causes and eliminate measure is:
(1) with rubber roller printing plate cylinder between stress, should reduce with rubber roller printing plate cylinder; the pressure between
(2) by version roller and plate stress light, should to readjust its pressure (2.5-3mm);
(3) by version roller and plate overweight, should reduce the pressure pressure;
(4) education version water acid is too strong, should be appropriately reduced; the acidic water education version
(5) ink over thin, should add "0 # in ink" printing ink oil;
(6) ink amount is too big, should reduce for ink amount;
(7) the printing ink desiccant add put excessive, should clean the ink roll, reduce the dosage of printing ink desiccant;
(8) plate itself, should change new refined sand holes.
16, the reason and the back ceng dirty eliminating methods
Ceng dirty refers to the back is just printed below the fold together, feature a printing ink to rub it on the back of a feature, causing the phenomenon of economic pollution.
The reason and the back ceng dirty exclusion methods are:
(1) ink dry bad or ink amount is too big, should be in the printing ink and addition of suitable amount of desiccant and prevent adhesive or reduce ink amount;
(2) paper too high, should be decreased paper stacked the height of stacked;
(3) ink is wet, pressure paper is too heavy;
17 and double reason
Double, commonly known as double seal, ghost, have two kinds: axial overlap, namely double part of imprinting and roller axis line approximate paper-cover line; Weeks, namely to double double part of imprinting and roller axis line perpendicular.
Axial double causes:
(1) the machine precision is poor, bearing a wear.
(2) the printing plate cylinder or rubber roller happen axial displacement.
(3) ink roller to channeling move (or by version roller and original machines don't match)
(4) paper "falbala"
Weeks to double the causes are:
(1) rubber cloth stretch tight not tight
(2) drum and pressure does not reach the designated position
(3) machine use for many years, roller gears, bearings wear or three large clearance between rollers.