Analysis: gravure film quality control – gravure printing, quality – Printing Industry
Plastic Soft Package Products, generally in a variety of plastic film Print , And then compound the barrier layer and heat sealing layer composite film, after slitting, bag making a product. The first printing is the production process, the most difficult to control a process, product quality problems have appeared in most of the process, assess a grade packaging products, printing quality is first. Therefore, to understand and control the printing process and quality becomes the key to flexible manufacturing.
Gravure printing plastic film in today's main printing methods, plastic film using gravure printing with fast, colorful, clear and crisp, moderate contrast, vivid image, the advantages of various specifications. Gravure printing resistant high strength, more than one million printed pieces of high-volume printing even more advantages.
Gravure quality requirements of plastic film products high quality standard of the printing looks as follows:
process through to the flowers, the colors and pattern register error is not greater than 0.3mm. check the film's specifications, colors and patterns register error is not greater than 0.3mm. check printing ink, asked the right hue, bright, uniform, bright shade of ink, ink soft, smooth edge imprinting. printing fastness, sticky tape, transparency does not wear pull ink. logo text lines, requirements are clear and complete, not fragmentary, not deformed. textured required level of rich, network clear. products clean, no dirt, wire cutter. required products with the color density deviations and the same batch were measured with color color line GB7707-87 requirements.
Order to better achieve the above quality requirements, we can from the following aspects of the gravure printing process control of plastic film:
1. To master all kinds of plastic Packaging film Elements of the substrate process
BOPP is the most common printing substrates, the production process points is a typical plastic gravure production process; use polyamide or chlorinated polypropylene ink, the appropriate tension and the imprint pressure, drying temperature at 80 .
BOPET printing points: PET is usually due to thin, easily wrinkled, when printing large tension, the ink has a certain selectivity, easier separation with general printing ink, film static large, prone to plugging Edition (not online), fluff and scraper marks (knife wire) phenomenon, printing shop humidity is good.
BOPA printing points: BOPA deformation of the film is easy to absorb moisture. Therefore, the printing press must ensure that humidity can not be too high (if not dehumidifying humidity of the environment is not suitable for the printing of nylon film); not printed film can not undermine its original aluminum packaging film, immediately after opening printing, printing on nylon membrane preheating required (if the machine does not preheat device can be installed in the second color plates after the first color as the warm air out of use), preheating temperature is 50 ~ 80 ; print to be appropriate to reduce the tension; pressure should be moderate; ink adaptable, depending on the choice of product structure, if the cooking bags to choose cooking ink; India finished product must be sealed packaging, storage room into the dry curing compound, and compound as soon as possible.
K coating film (KOP, KPA, KPET) printing elements: K coating film because both roller-type or spray type, its thickness uniformity are not very good, surface smooth, rigid and brittle and PVDC, Tension at the time of printing and embossing printing pressure can not be too large, overprint is difficult, metastatic ink poor print version easily from shallow net spend (part of the network is lost), requires the use of high hardness of the printing rollers. In addition, a selective solvent, solvent coating is not dissolved at that time may be down, large print film residual solvent, and easy to adhesion, so drying and cooling needs special attention. MATT OPP printing process can be used in its smooth conduct in India, but because the surface layer can not withstand high temperature and extinction, need to control the drying temperature.
Pearl membrane surface printing ink used for surface printing, and try to use good form of transparency and India ink. Shrink film printing, low drying temperature should be adopted to select the specific heat shrinkable ink (printed ink layer to be able to be shrinking rather than falling), if it is PVC heat shrinkable film should also consider the dissolution of solvent on the film sex.
not stretch the PP, PE film tension to a very small printing, overprint difficult, pattern Design Time to fully consider the deformation of the printing.
2. Prepress process of developing plate design. In the plate, you need to design according to the characteristics of gravure designed to modify the manuscript, it will be more suitable for printing needs.
Need to overprint, such as small lines, words can not use multi-color overlay, chromatic patterns, there must be a small anti-white, even chromatic motif should not be left blank, put on other small text, portraits and so on requirements more stringent version of overlay, black, blue, red, yellow version of the middle try not to repeat other color version. Printing needs, bar codes as far as the direction for the line drum circle in the same direction with the version. Color assurance, if able to do so, a large field background color and pattern version of the best levels of separate plate, a large field background as far as the feature pages. Hanging screen must fully consider the 80% and 5% of the area two color jumping, gradual hanging nets dot the limit should be 10%.
ink deployment. Adaptive adjustment of the ink, such as ink viscosity, concentration, its principle is to adjust ink viscosity diluent (solvent) control, before the printing machine according to Roller and determined in good ink viscosity in the printing process often the case in accordance with solvent evaporation added solvent, but not excessive, as far as possible to ensure constant ink viscosity; ink hub on, you must use the diluent (transfer ink oil), should not use solvent to dilute.
Deployment of ink colors. In this regard to note the following: observe the color of light as a standard light source (D65), if there is no standard light source, be in a sunny window of the direction of north is better. Preparation of special colors, ink colors should be used to allocate, where said primary color ink is pigment ink works directly produced by the use of ink, such ink ink brightness and saturation are guaranteed. With the fewest possible number of ink colors for color, the more the color, the color error is larger, the greater the difficulty of re-color.
3. Proofing
A printing plate in the cast, it must first confirm that a standard proofs. Some manufacturers get to play comp plate factory as a standard sample, and finally printing the time of delivery can not be on the way, it must be used before the printing press proofing, by the customer or the officer confirmed as a standard sample. Standard kind of printing should be printed in the normal process conditions, otherwise
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