Corrugated flexo water-based ink urgent need to develop national standards – corrugated boxes, ink, standard – Paper Industry
The last decade, Corrugated Carton Water-based Flexo Ink Showed a trend of rapid growth in demand, but there is the problem of varying quality, which related to standards and the lack of direct relationship. Corrugated flexo water-based ink for without benzene, esters, ketones and other flammable, explosive, volatile, toxic Solvent , Is no corrosion, environment-friendly green security ink, was was a bit alkaline liquid state. It has a fast-drying nature of printing materials to meet the printing and high-speed paper printing needs, and low viscosity, good fluidity, transfer ink performance, can use very simple A pattern transfer ink roller ink transfer system. In the past 10 years in the flexo printing printing and paper products has been rapidly developed and applied. Especially in the corrugated box industry, printing, flexo water-based ink is now largely (hereinafter referred to as ink) dominated. However, domestic production of ink business, ink technology and materials in the quality of selected differences and the different instrumentation used, the ink companies develop specific quality parameters are varied. Leading to uneven quality of ink on the market, appears inconsistent quality, thixotropy is not good, lack of color saturation, dry and poor, poor wear resistance and the use of technology problems. To users in the printing process, printing quality control more difficult. Therefore I believe that, on the need for a domestic Ink uniform standards to meet the needs.
Standard ink formulation, ink from the production, use, inspection, arbitration, and flow storage and warehousing and other areas to consider the possibility of implementing the standard. To standard setting, it can achieve the role of the following aspects: solve the ink during the printing process problems. Ink suppliers to take on big clients to send professional and technical personnel into the plant transfer ink to solve the problem, but for small customers in the process of quality problems and process issues, have left the carton factory Printing Themselves to deal with. If you have ink standard, will enable the legitimate interests of small customers should be protected. manufacturing quality guarantees the stability of ink, and ink to prevent and reduce the production, use, inspection, storage process unnecessary losses. producers and users in the event of a dispute there is a basis for determining the relevant agencies are also testing and arbitration in accordance with well documented. domestic ink after nearly 10 years of development has been gradually becoming more mature, the development of standards to further promote and enhance the quality of our ink. help unify testing methods to improve our ink production, use, inspection, storage, custody level.
Of the ink should be standardized norms scope and content. The following example
performance of corrugated boxes printing has a direct impact, and may reflect the merits of the state ink.
1. Ink technology the main material quality requirements, the quality of the ink has a direct impact on:
Binders (resins): Due to the resin for ink selection are: Sodium Fiber Cellulose, Acrylic acid Resins, poly ketone resin, Epoxy resin , Alkyd resins, shellac, rosin resin. Different resin ink performance greatly, so deal with different models (ie different grades) of the ink; the resin specific quality requirements and regulations.
Pigment Quality requirements: pigment is colored ink material, requires a resistance to resistance, such as light resistance, heat resistance, weather resistance, friction resistance, bright color, strong coloring. The chromatography is complete, color high concentration, easy to achieve high hiding power. The pigment of the ink quality and technical in requirements should also be provided for.
Solvent Additives Quality requirements: solvent ink water, but mainly stabilizer additives, defoamers, wetting and dispersing agent, PH value of the regulator, and slow drying agent, Drier , Smooth etc, can be attached to standard, an attachment for the flexo ink users.
2. Color and color strength: the same type of ink should maintain the stability of its hue, even in different batches of printed products, printing still maintain a certain color. The first batch of products in the printing, general printing sample collection to archiving. For the same product in the future when printing check. Ink color strength effect refers to a change in another color ink level of the size of the deployment spot color ink, and when one of the original ink hue or color force changes, tune out the spot color ink color will change. Strong coloring, imprinting can guarantee a high hiding power. Tinting strength 97%.
3. Viscosity: the viscosity of ink is water-based flexo ink the size of cohesion, the most important control for the ink indicator. In the printing process, the ink has a certain viscosity is to maintain normal transmission, a necessary condition for the transfer ink. Decision due to the viscosity of ink transfer properties, affect the transmission system of the ink ink transfer, and imprinting a strong degree of gloss and color stability and transfer ink, thus generally high viscosity of ink control 20 ± 5 seconds , differences in viscosity will cause the different shades of color printing, the viscosity might cause the following deficiencies: ink transfer, the transfer difficult. Flexo printing machine for the general fast pace, especially in India and completed the first color to a second color, the interval of only a few seconds to zero seconds, if the ink viscosity, there will not be easily separated, transfer of slow, slow drying. easy to cause the paper galling, powder from the phenomenon, and some paper as stripping. difficult to fill hole in the network, while difficult diplomatically to scrape scraper net wall part of the ink. Practice has proved that, under the same conditions, viscosity of ink division transfer than the viscosity of the ink better, so flexo ink viscosity is less common, the most suitable printing viscosity range to control 17 seconds to 25 seconds is better, but the ink viscosity can not be too small, otherwise easily lead to imprinting in the ink when the network easy to deform, expand the network there, so that graphic representation of variation, will cause serious, Mexico body emulsion, or it can not properly transfer, transfers, and gradually in the roller, print version of the heap Pigment When the accumulation reaches a certain level will cause paste version.
4.PH value: PH value of the viscosity of the ink has a direct impact. Ink generally weak alkaline, PH value in the control of the printing is very important: When the PH value is higher than 9.5, too alkaline, ink viscosity reduction, slow drying, water resistance variation; when the PH value less than 8.5, the alkaline it is too weak, ink viscosity increased metastatic worse, ink drying, easy to plug the print edition and roller, lead to pages of dirty, paste version failure occurs, and bubbles . PH value of ammonia compounds mainly depend on to maintain, but because of the printing process ammonia substances
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