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The knowledge required for understanding of the carton printing machine
post time: 2013-5-7 | hits: 1048 |
A current plate type hardness.
Synthetic rubber edition - - 35 - - - - -? - - 40? Degree easy hardening of natural rubber edition - - - 33? Not easy hardening liquid version - - - - 33? - 35? For a long time without easy softening solid edition - - - - 33? - 35? Low line screen and -. - - 45? - 55? Number of wire (thin version) overview screen printing plate
Two. Material and production currently used in Flexography
1 material - natural rubber or synthetic rubber as main component making method, using hand carved or laser (laser) carved into the rubber version
2 material, epoxy resin, silicone resin or resin as the main component making method - using photographic production, known as the photosensitive resin plate
3 thin printing - a sponge material as the back pad attached to the printing roller, printing plate production 2 material thickness is low, the two at the same time after use and the general version of the same thickness.
4 plate requirements
Requirements - thickness A. thickness error is small
The stability of B. plate size when - stretch small
C. hardness requirements hardness change little.
D. elastic demand elasticity of small changes.
E. durability - printing times
Transfer force ink F. ink transfer ability.
Compare the advantages and disadvantages of the 5 rubber plates and photosensitive resin plate
A rubber:
The advantages of low cost, less procedures - making and printing quality is poor, easy disadvantages - joints of degumming, artificial cost is high, hand carved and drawing skills to develop, precision limit, consuming hours long, short service life, scalability.
B photosensitive resin plate:
The advantages of stability, high precision - telescopic dimensions, hardness elastic good, fine dot expression of good, printing pressure light adjustment range, high precision, small thickness of ink, plate making time to power shortage point - equipment high cost, complex processing, solvent resistance is poor, not high temperature resistant rubber plate
6 selection of printing plate
There is a close relationship between the appearance of the display printing with the original design concept, consumers see is the appearance of printed packaging products, so the version of the good and bad directly affect the print quality, current trends in high quality printing method, and discard the previous cover rubber stamp square type printing (flexography for corrugated board, there is no real standard, emphasize the captain must have some characters and patterns of the factory printing test, in order to establish his own in-house standards).
Test 7 pilot has to do:
Error test plate and the pattern roller gap value
The numerical test printing pressure plate gap between
Testing of various plate between the ink transfer ability
Differences in testing various Leng don't printing effect
Differences in test of various materials with printing effect
The difference of different hardness test plate on the same page printing effect can be measured by the above various plate is suitable for printing quality is, can detect the plates, and the data record the related information to the decision to use the.
The same shall print full color, fine words, dot, color, only with different plate combination to solve this problem, also can be the same conditions (ink, printing pressure, ink clearance to elegant version) printing effect.
Three. The relationship between water ink ink and plate by the following raw materials:
1 of the pigment - pigment is to provide color and the color density, can not be directly attached to the paper.
2 resin, resin paint is fixed on the board, in order to control the water ink control function, this function can affect the adaptability of water based ink for printing, directly affects the quality of.
Convenience, 3 assistant - Auxiliaries for application of ink and some special requirements on the final properties such as abrasion resistance, sterilization, inhibition of foaming, laminated color....
4 water - now most of water ink are not containing alcohol, water is only used to dilute aqueous ink, in order to achieve the viscosity of the solvent; but the water is not added directly in production.
5 what is the dirty version
* color printing dirty version is made of resin particles can not be dissolved, the version is transferred to the paper, and the formation of printing.
* the full version of the layout of printing is sticky and ink transfer resulting in the dirty version, adjustment or restore the ink has volatile alkali, alkali dissolve in water ink so that we can get clean printing.
* printing dirty version even after cleaning will be in place, so the resin solvent pH control in color printing has become an indispensable.
* the ink on the overprint, pH control becomes very important, because the base will dissolve the resin, so the ink base layer of too much can cause galling or bleeding; if the pH and viscosity water-based ink printed decreased, this phenomenon can be avoided.
* the overprint ink pH value successively decreased, but the viscosity water-based ink in order to increase.
Four. The water-based printing slotting die-cutting machine operation of common sense
What is a water-based printing:
The water-based ink the circulatory system into anilox and rubber rollers or closed blade cavity, the ink transferred to the printing plate attached on the roller, and then transferred to the printing paper.
Printing machine parts of introduction and modification of the standard
The 1 paper feeding part
The front baffle - gap is set to 1.5 times the thickness of cardboard, moderate distance.
Side baffle - by patting plate side dimension 2mm.
Beat together board - shoot Qi shot into the side baffle plate 10-20mm.
Plate, front plate and rear apron is less 2mm, lower than 2mm.
Suction table - in speed paper size and the bending degree adjustment of air volume.
Front paper - according to the paper feed size, adjust the paper gate rise time.
Push paperboard - back 0 point play paper enters after the file version of the 5-8mm.
The feed roller clearance adjustment by - paper feeding roller pressure gap shall be not less than the thickness of cardboard, special circumstances such as the limit but crush depth shall not exceed 0.1mm.
2 Printing Department
Rubber roller - also called the scraping roller, roller gap adjustment to every time with the same hue to the same printing.
Scraping knife, scraper to clean.
Roll pattern - parallelism to accurately, and print to touch and to near the 0 - point, without access to the printed version pads, ink hole should be kept clean and intact.
Printing roller - hanging version line to align, firmly and transverse to zero, the printing roller to clean.
Printing roller - gap set with light pressure, can avoid gain produce waves mark fine words is not clear, the full version of hollow words double shadow, its printing crush depth shall not exceed 0.2mm.
Pull wheel - size at least press paper edge more than 10mm, the gap to height line thickness under the pressure of 0.3mm - -0.6mm, each color and color 0.1mm less than before.
Vacuum transfer, in accordance with the size of the paper to adjust the suction area, according to the paper thickness adjustment of air volume, in accordance with the vehicle speed to adjust the size of air.
3 Slot
Pre pressing wheel - gap should be less than the board thickness half in do not break the principle.
Line pressing roller - gap is about half the pre pressing wheel so as not to break the principle.
Slotted knife, knife knife cut the gap of about 4mm, paper clip gap about 5mm upper base and the lower base paste foam slip.
Trimming knife, knife knife contact above 6mm, to the vertical sealing.
4 die cutting the Ministry
Pull wheel - set value transmission side into the edge of the paper 10mm, the operating side for the first knife inside 10mm.
Start with base point of cutting roller - loaded die cutter, to be completely fixed does not shift.
Rubber - test time gap should be light, slowly rolling pressure required to.
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