What method can be used to determine that ink migration will not be caused by changes in ambient temperature during ink production?
In view of this problem, the author combined with my practical experience, the judgment method is: first take the test (or production) ink with a color stick or color wheel or ink proofing machine to print a print, after the ink film is dried, print the print (Ink film face up) Place on a metal whiteboard (coated with white ink or white paint or white paint), then seal the two layers with adhesive tape and after compaction, turn on the electric stove and put a pot or beaker on it, add Water, when the water is boiling, put the sealed print into the boiling water, and immediately remember the time, take out the print after one hour of boiling, and remove the adhesive tape and the print, observe the dense There is no color attached to the bottom white metal plate. If not, it means that the ink will not migrate the printed ink film due to changes in ambient temperature and humidity within two years, otherwise the reverse is true.
How to judge that the printing ink is stable in a short time, and the leveling is good (for example, the color becomes lighter after printing for a period of time or when the printer gradually speeds up, the ink changes from dark to light, until the ink is not transferred )?
A simple method is: drop 0.1g of ink on the top of the scraper fineness meter (meter), hold the scraper (knife) at a 45 ° angle and scrape down from top to bottom. Use this method to continuously scrape three times, and then observe the ink Whether the length of the scraping can be in the 0μm scale value and there is ink, if there is ink, the ink will not have the printing ink failure mentioned above, otherwise the reverse.
Is the printing ink poor in light fastness, is it a pigment problem? What is the standard?
The light fastness of the printing ink is not good, mainly due to the pigment problem, followed by the problem of the binder material of the ink system.
The standards for evaluating the light fastness and weather fastness of packaging printing inks are blue cards and gray cards. This method was used to evaluate the light fastness and weather fastness of textiles as early as the 1950s. That is, it is composed of 8 different light fastnesses. The light fastness of grade 1 is the worst and the grade 8 is the highest. During the test, the printed samples and the standard samples are put together to observe the level of change. [next]
Will ink drawing affect the printing quality?
In general, although the stability of the ink drawn (that is, viscoelastic) is better, it is often due to the fact that when the high-speed printing, the filament drawn by the ink is broken, it will easily cause flying ink and splashing under the action of centrifugal force. Dirty printing, etc., so a good ink, whether it is gravure, relief or offset printing ink, requires no drawing or short drawing, to prevent the ink from stretching after stretching due to its own cohesion, and finally in the middle It is broken, so it is now used as an indicator to evaluate the quality of the ink.
What are the characteristics and classification of packaging printing ink colors?
The color characteristics of packaging and printing inks are hue, lightness (brightness), saturation (chroma), and the classification of packaging and printing ink colors are: color and achromatic two types (color refers to other than black ink, white ink and gray ink Ink color; achromatic refers to black ink, white ink and gray ink with intermediate colors).
When can I determine the appropriate amount of ink defoamer?
Generally speaking, when the ink is mass-produced, a small sample test should be carried out first. The ink to be tested shall be tested and recorded in various technical indicators. After the next day (that is, 24 hours), the same test method shall be used. Once measured, generally the last time is the actual technical index of the ink, but in our actual production, some small ink companies do not have a special laboratory or test tools. According to the author's experience: In the process of the same detection method mentioned above, two items must be added. One item is to put the produced ink in water, and then test the above items when the temperature of the ink reaches 25 ° C, and finally conduct three consecutive times to find the average The value, that is, the actual data of the ink, is the only way to achieve a balance between the performance of the defoamer and the shrinkage cavity, otherwise, it will be mistakenly thought that the defoamer is insufficient and will be added in excess, which often makes defoaming more difficult to eliminate, Printing failures that cause shrink holes. [next]
Why should the water-based plastic ink printing scope be marked?
This is because the water-based plastic ink system contains a certain amount of alcohol solvent (water-soluble) resin binder and pigment. How to maintain the stability of the printing ink dispersion, prevent resin gelation, and prevent the pigment from flocculating in the binder dispersion system , Sedimentation and ink thickening, etc. In addition, water or water-soluble resins or pigments are restricted by their own pH value, hydrogen bonding force, surface tension, interface electrostatic attraction, free energy, dispersion and drying, etc., so they are also used accordingly. Restrictions, for water-based or water-soluble plastic inks, most manufacturers will provide the scope of adaptation of the water-based plastic ink printing materials.
Is there a difference in coloring materials in white ink?
Regardless of the type of white ink, usually titanium dioxide or zinc white pigment, lithopone, etc. are used as colorants (agents)? Titanium dioxide is divided into untreated surface rutile titanium dioxide or surface treated rutile Type titanium dioxide, because of the price and cost differences of ink, most choose anatase type titanium dioxide as a colorant? However, compared with the former, there are defects such as poor photochemistry, poor durability and easy to pulverize the ink film of the ink.
What are the obvious differences between water-based and solvent-based two-component polyurethane inks?
According to the author's knowledge, the hardness of the latter is higher than that of the former by 1/4; the former of tensile strength is lower than 1/8 of the latter; the former of elongation is almost twice higher than the latter. [next]
Which type of defoamer is better for water-based plastic ink?
Considering the drying time of water-based plastic ink, it is appropriate to choose a defoamer with strong defoaming power.
Is the number of ink grinding times better or less?
Generally speaking: the more times of grinding, the finer the ink and the higher the distribution rate.
How is blue paste made?
Generally speaking, the color paste is a semi-finished product formed by dispersing the pigment or pigment and filler in the resin binder. For example, pure oil as the binder is called oily paste, while resin binder is called resin paste, and water or organic solvents and some dispersion aids are called aqueous pastes. Due to the type of binder Many, and involve different types of color paste, the ratio of pigment contained in the color paste system is different, and the type, use and dosage of the color paste are also different. In the production of color paste, in order to make the pigments and the like better dispersed in the ink fountain, a small amount of surfactant is often added in the manufacturing process, such as zinc naphthenate, etc. are also common manufacturing methods.
Computer Chair by fabric:
1. Mesh fabric: high-back Office Chair, Mid-back office chair, Ergonomic adjustable chair.
2. Leather Chair: large class chair is most used Leather: genuine leather and imitation leather.
3. Linen fabric:work chair, staff chair, middle class chair.
Computer chair by place of application:
1. Staff chair
2. Working chair
3. Student chair and traning chair
4. Meeting chair
6. Mid-back office chair
7. High-back office chair
Office Chair
Office Chair,Office Furniture,Study Room Furniture,Training Conference Furniture
Foshan Hollin Furniture Co.,Ltd , https://www.china-hollin.com